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Index: head/sys/conf/files
===================================================================
--- head/sys/conf/files
+++ head/sys/conf/files
@@ -3808,6 +3808,7 @@
kern/subr_eventhandler.c standard
kern/subr_fattime.c standard
kern/subr_firmware.c optional firmware
+kern/subr_filter.c standard
kern/subr_gtaskqueue.c standard
kern/subr_hash.c standard
kern/subr_hints.c standard
Index: head/sys/kern/subr_filter.c
===================================================================
--- head/sys/kern/subr_filter.c
+++ head/sys/kern/subr_filter.c
@@ -0,0 +1,482 @@
+/*-
+ * Copyright (c) 2016-2019 Netflix, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Author: Randall Stewart <rrs@netflix.com>
+ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/errno.h>
+#include <sys/tim_filter.h>
+
+void
+reset_time(struct time_filter *tf, uint32_t time_len)
+{
+ tf->cur_time_limit = time_len;
+}
+
+void
+reset_time_small(struct time_filter_small *tf, uint32_t time_len)
+{
+ tf->cur_time_limit = time_len;
+}
+
+/*
+ * A time filter can be a filter for MIN or MAX.
+ * You call setup_time_filter() with the pointer to
+ * the filter structure, the type (FILTER_TYPE_MIN/MAX) and
+ * the time length. You can optionally reset the time length
+ * later with reset_time().
+ *
+ * You generally call apply_filter_xxx() to apply the new value
+ * to the filter. You also provide a time (now). The filter will
+ * age out entries based on the time now and your time limit
+ * so that you are always maintaining the min or max in that
+ * window of time. Time is a relative thing, it might be ticks
+ * in milliseconds, it might be round trip times, its really
+ * up to you to decide what it is.
+ *
+ * To access the current flitered value you can use the macro
+ * get_filter_value() which returns the correct entry that
+ * has the "current" value in the filter.
+ *
+ * One thing that used to be here is a single apply_filter(). But
+ * this meant that we then had to store the type of filter in
+ * the time_filter structure. In order to keep it at a cache
+ * line size I split it to two functions.
+ *
+ */
+int
+setup_time_filter(struct time_filter *tf, int fil_type, uint32_t time_len)
+{
+ uint64_t set_val;
+ int i;
+
+ /*
+ * You must specify either a MIN or MAX filter,
+ * though its up to the user to use the correct
+ * apply.
+ */
+ if ((fil_type != FILTER_TYPE_MIN) &&
+ (fil_type != FILTER_TYPE_MAX))
+ return(EINVAL);
+
+ if (time_len < NUM_FILTER_ENTRIES)
+ return(EINVAL);
+
+ if (fil_type == FILTER_TYPE_MIN)
+ set_val = 0xffffffffffffffff;
+ else
+ set_val = 0;
+
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = set_val;
+ tf->entries[i].time_up = 0;
+ }
+ tf->cur_time_limit = time_len;
+ return(0);
+}
+
+int
+setup_time_filter_small(struct time_filter_small *tf, int fil_type, uint32_t time_len)
+{
+ uint32_t set_val;
+ int i;
+
+ /*
+ * You must specify either a MIN or MAX filter,
+ * though its up to the user to use the correct
+ * apply.
+ */
+ if ((fil_type != FILTER_TYPE_MIN) &&
+ (fil_type != FILTER_TYPE_MAX))
+ return(EINVAL);
+
+ if (time_len < NUM_FILTER_ENTRIES)
+ return(EINVAL);
+
+ if (fil_type == FILTER_TYPE_MIN)
+ set_val = 0xffffffff;
+ else
+ set_val = 0;
+
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = set_val;
+ tf->entries[i].time_up = 0;
+ }
+ tf->cur_time_limit = time_len;
+ return(0);
+}
+
+
+static void
+check_update_times(struct time_filter *tf, uint64_t value, uint32_t now)
+{
+ int i, j, fnd;
+ uint32_t tim;
+ uint32_t time_limit;
+ for(i=0; i<(NUM_FILTER_ENTRIES-1); i++) {
+ tim = now - tf->entries[i].time_up;
+ time_limit = (tf->cur_time_limit * (NUM_FILTER_ENTRIES-i))/NUM_FILTER_ENTRIES;
+ if (tim >= time_limit) {
+ fnd = 0;
+ for(j=(i+1); j<NUM_FILTER_ENTRIES; j++) {
+ if (tf->entries[i].time_up < tf->entries[j].time_up) {
+ tf->entries[i].value = tf->entries[j].value;
+ tf->entries[i].time_up = tf->entries[j].time_up;
+ fnd = 1;
+ break;
+ }
+ }
+ if (fnd == 0) {
+ /* Nothing but the same old entry */
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ }
+ }
+ i = NUM_FILTER_ENTRIES-1;
+ tim = now - tf->entries[i].time_up;
+ time_limit = (tf->cur_time_limit * (NUM_FILTER_ENTRIES-i))/NUM_FILTER_ENTRIES;
+ if (tim >= time_limit) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+}
+
+static void
+check_update_times_small(struct time_filter_small *tf, uint32_t value, uint32_t now)
+{
+ int i, j, fnd;
+ uint32_t tim;
+ uint32_t time_limit;
+ for(i=0; i<(NUM_FILTER_ENTRIES-1); i++) {
+ tim = now - tf->entries[i].time_up;
+ time_limit = (tf->cur_time_limit * (NUM_FILTER_ENTRIES-i))/NUM_FILTER_ENTRIES;
+ if (tim >= time_limit) {
+ fnd = 0;
+ for(j=(i+1); j<NUM_FILTER_ENTRIES; j++) {
+ if (tf->entries[i].time_up < tf->entries[j].time_up) {
+ tf->entries[i].value = tf->entries[j].value;
+ tf->entries[i].time_up = tf->entries[j].time_up;
+ fnd = 1;
+ break;
+ }
+ }
+ if (fnd == 0) {
+ /* Nothing but the same old entry */
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ }
+ }
+ i = NUM_FILTER_ENTRIES-1;
+ tim = now - tf->entries[i].time_up;
+ time_limit = (tf->cur_time_limit * (NUM_FILTER_ENTRIES-i))/NUM_FILTER_ENTRIES;
+ if (tim >= time_limit) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+}
+
+
+
+void
+filter_reduce_by(struct time_filter *tf, uint64_t reduce_by, uint32_t now)
+{
+ int i;
+ /*
+ * Reduce our filter main by reduce_by and
+ * update its time. Then walk other's and
+ * make them the new value too.
+ */
+ if (reduce_by < tf->entries[0].value)
+ tf->entries[0].value -= reduce_by;
+ else
+ tf->entries[0].value = 0;
+ tf->entries[0].time_up = now;
+ for(i=1; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = tf->entries[0].value;
+ tf->entries[i].time_up = now;
+ }
+}
+
+void
+filter_reduce_by_small(struct time_filter_small *tf, uint32_t reduce_by, uint32_t now)
+{
+ int i;
+ /*
+ * Reduce our filter main by reduce_by and
+ * update its time. Then walk other's and
+ * make them the new value too.
+ */
+ if (reduce_by < tf->entries[0].value)
+ tf->entries[0].value -= reduce_by;
+ else
+ tf->entries[0].value = 0;
+ tf->entries[0].time_up = now;
+ for(i=1; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = tf->entries[0].value;
+ tf->entries[i].time_up = now;
+ }
+}
+
+void
+filter_increase_by(struct time_filter *tf, uint64_t incr_by, uint32_t now)
+{
+ int i;
+ /*
+ * Increase our filter main by incr_by and
+ * update its time. Then walk other's and
+ * make them the new value too.
+ */
+ tf->entries[0].value += incr_by;
+ tf->entries[0].time_up = now;
+ for(i=1; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = tf->entries[0].value;
+ tf->entries[i].time_up = now;
+ }
+}
+
+void
+filter_increase_by_small(struct time_filter_small *tf, uint32_t incr_by, uint32_t now)
+{
+ int i;
+ /*
+ * Increase our filter main by incr_by and
+ * update its time. Then walk other's and
+ * make them the new value too.
+ */
+ tf->entries[0].value += incr_by;
+ tf->entries[0].time_up = now;
+ for(i=1; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = tf->entries[0].value;
+ tf->entries[i].time_up = now;
+ }
+}
+
+void
+forward_filter_clock(struct time_filter *tf, uint32_t ticks_forward)
+{
+ /*
+ * Bring forward all time values by N ticks. This
+ * postpones expiring slots by that amount.
+ */
+ int i;
+
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].time_up += ticks_forward;
+ }
+}
+
+
+void
+forward_filter_clock_small(struct time_filter_small *tf, uint32_t ticks_forward)
+{
+ /*
+ * Bring forward all time values by N ticks. This
+ * postpones expiring slots by that amount.
+ */
+ int i;
+
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].time_up += ticks_forward;
+ }
+}
+
+
+void
+tick_filter_clock(struct time_filter *tf, uint32_t now)
+{
+ int i;
+ uint32_t tim, time_limit;
+
+ /*
+ * We start at two positions back. This
+ * is because the oldest worst value is
+ * preserved always, i.e. it can't expire
+ * due to clock ticking with no updated value.
+ *
+ * The other choice would be to fill it in with
+ * zero, but I don't like that option since
+ * some measurement is better than none (even
+ * if its your oldest measurment).
+ */
+ for(i=(NUM_FILTER_ENTRIES-2); i>=0 ; i--) {
+ tim = now - tf->entries[i].time_up;
+ time_limit = (tf->cur_time_limit * (NUM_FILTER_ENTRIES-i))/NUM_FILTER_ENTRIES;
+ if (tim >= time_limit) {
+ /*
+ * This entry is expired, pull down
+ * the next one up.
+ */
+ tf->entries[i].value = tf->entries[(i+1)].value;
+ tf->entries[i].time_up = tf->entries[(i+1)].time_up;
+ }
+
+ }
+}
+
+void
+tick_filter_clock_small(struct time_filter_small *tf, uint32_t now)
+{
+ int i;
+ uint32_t tim, time_limit;
+
+ /*
+ * We start at two positions back. This
+ * is because the oldest worst value is
+ * preserved always, i.e. it can't expire
+ * due to clock ticking with no updated value.
+ *
+ * The other choice would be to fill it in with
+ * zero, but I don't like that option since
+ * some measurement is better than none (even
+ * if its your oldest measurment).
+ */
+ for(i=(NUM_FILTER_ENTRIES-2); i>=0 ; i--) {
+ tim = now - tf->entries[i].time_up;
+ time_limit = (tf->cur_time_limit * (NUM_FILTER_ENTRIES-i))/NUM_FILTER_ENTRIES;
+ if (tim >= time_limit) {
+ /*
+ * This entry is expired, pull down
+ * the next one up.
+ */
+ tf->entries[i].value = tf->entries[(i+1)].value;
+ tf->entries[i].time_up = tf->entries[(i+1)].time_up;
+ }
+
+ }
+}
+
+uint32_t
+apply_filter_min(struct time_filter *tf, uint64_t value, uint32_t now)
+{
+ int i, j;
+
+ if (value <= tf->entries[0].value) {
+ /* Zap them all */
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ return (tf->entries[0].value);
+ }
+ for (j=1; j<NUM_FILTER_ENTRIES; j++) {
+ if (value <= tf->entries[j].value) {
+ for(i=j; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ break;
+ }
+ }
+ check_update_times(tf, value, now);
+ return (tf->entries[0].value);
+}
+
+uint32_t
+apply_filter_min_small(struct time_filter_small *tf,
+ uint32_t value, uint32_t now)
+{
+ int i, j;
+
+ if (value <= tf->entries[0].value) {
+ /* Zap them all */
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ return (tf->entries[0].value);
+ }
+ for (j=1; j<NUM_FILTER_ENTRIES; j++) {
+ if (value <= tf->entries[j].value) {
+ for(i=j; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ break;
+ }
+ }
+ check_update_times_small(tf, value, now);
+ return (tf->entries[0].value);
+}
+
+uint32_t
+apply_filter_max(struct time_filter *tf, uint64_t value, uint32_t now)
+{
+ int i, j;
+
+ if (value >= tf->entries[0].value) {
+ /* Zap them all */
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ return (tf->entries[0].value);
+ }
+ for (j=1; j<NUM_FILTER_ENTRIES; j++) {
+ if (value >= tf->entries[j].value) {
+ for(i=j; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ break;
+ }
+ }
+ check_update_times(tf, value, now);
+ return (tf->entries[0].value);
+}
+
+
+uint32_t
+apply_filter_max_small(struct time_filter_small *tf,
+ uint32_t value, uint32_t now)
+{
+ int i, j;
+
+ if (value >= tf->entries[0].value) {
+ /* Zap them all */
+ for(i=0; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ return (tf->entries[0].value);
+ }
+ for (j=1; j<NUM_FILTER_ENTRIES; j++) {
+ if (value >= tf->entries[j].value) {
+ for(i=j; i<NUM_FILTER_ENTRIES; i++) {
+ tf->entries[i].value = value;
+ tf->entries[i].time_up = now;
+ }
+ break;
+ }
+ }
+ check_update_times_small(tf, value, now);
+ return (tf->entries[0].value);
+}
Index: head/sys/modules/tcp/Makefile
===================================================================
--- head/sys/modules/tcp/Makefile
+++ head/sys/modules/tcp/Makefile
@@ -6,10 +6,12 @@
.include "${SYSDIR}/conf/kern.opts.mk"
SUBDIR= \
+ ${_tcp_bbr} \
${_tcp_rack} \
${_tcpmd5} \
.if ${MK_EXTRA_TCP_STACKS} != "no" || defined(ALL_MODULES)
+_tcp_bbr= bbr
_tcp_rack= rack
.endif
Index: head/sys/modules/tcp/bbr/Makefile
===================================================================
--- head/sys/modules/tcp/bbr/Makefile
+++ head/sys/modules/tcp/bbr/Makefile
@@ -0,0 +1,23 @@
+#
+# $FreeBSD$
+#
+
+.PATH: ${.CURDIR}/../../../netinet/tcp_stacks
+
+STACKNAME= bbr
+KMOD= tcp_${STACKNAME}
+SRCS= bbr.c sack_filter.c rack_bbr_common.c
+
+SRCS+= opt_inet.h opt_inet6.h opt_ipsec.h
+SRCS+= opt_tcpdebug.h
+SRCS+= opt_kern_tls.h
+
+#
+# Enable full debugging
+#
+#CFLAGS += -g
+
+CFLAGS+= -DMODNAME=${KMOD}
+CFLAGS+= -DSTACKNAME=${STACKNAME}
+
+.include <bsd.kmod.mk>
Index: head/sys/netinet/ip_output.c
===================================================================
--- head/sys/netinet/ip_output.c
+++ head/sys/netinet/ip_output.c
@@ -212,7 +212,7 @@
static int
ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
- const struct sockaddr_in *gw, struct route *ro)
+ const struct sockaddr_in *gw, struct route *ro, bool stamp_tag)
{
#ifdef KERN_TLS
struct ktls_session *tls = NULL;
@@ -256,7 +256,7 @@
mst = inp->inp_snd_tag;
}
#endif
- if (mst != NULL) {
+ if (stamp_tag && mst != NULL) {
KASSERT(m->m_pkthdr.rcvif == NULL,
("trying to add a send tag to a forwarded packet"));
if (mst->ifp != ifp) {
@@ -791,7 +791,8 @@
*/
m_clrprotoflags(m);
IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
- error = ip_output_send(inp, ifp, m, gw, ro);
+ error = ip_output_send(inp, ifp, m, gw, ro,
+ (flags & IP_NO_SND_TAG_RL) ? false : true);
goto done;
}
@@ -827,7 +828,7 @@
IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
mtod(m, struct ip *), NULL);
- error = ip_output_send(inp, ifp, m, gw, ro);
+ error = ip_output_send(inp, ifp, m, gw, ro, true);
} else
m_freem(m);
}
Index: head/sys/netinet/ip_var.h
===================================================================
--- head/sys/netinet/ip_var.h
+++ head/sys/netinet/ip_var.h
@@ -166,6 +166,7 @@
#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */
#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */
#define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */
+#define IP_NO_SND_TAG_RL 0x80 /* Don't send down the ratelimit tag */
#ifdef __NO_STRICT_ALIGNMENT
#define IP_HDR_ALIGNED_P(ip) 1
Index: head/sys/netinet/tcp.h
===================================================================
--- head/sys/netinet/tcp.h
+++ head/sys/netinet/tcp.h
@@ -239,6 +239,7 @@
#define TCP_BBR_ACK_COMP_ALG 1096 /* Not used */
#define TCP_BBR_TMR_PACE_OH 1096 /* Recycled in 4.2 */
#define TCP_BBR_EXTRA_GAIN 1097
+#define TCP_RACK_DO_DETECTION 1097 /* Recycle of extra gain for rack, attack detection */
#define TCP_BBR_RACK_RTT_USE 1098 /* what RTT should we use 0, 1, or 2? */
#define TCP_BBR_RETRAN_WTSO 1099
#define TCP_DATA_AFTER_CLOSE 1100
Index: head/sys/netinet/tcp_stacks/bbr.c
===================================================================
--- head/sys/netinet/tcp_stacks/bbr.c
+++ head/sys/netinet/tcp_stacks/bbr.c
@@ -0,0 +1,15189 @@
+/*-
+ * Copyright (c) 2016-2019
+ * Netflix Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+/**
+ * Author: Randall Stewart <rrs@netflix.com>
+ * This work is based on the ACM Queue paper
+ * BBR - Congestion Based Congestion Control
+ * and also numerous discussions with Neal, Yuchung and Van.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include "opt_ipsec.h"
+#include "opt_tcpdebug.h"
+#include "opt_ratelimit.h"
+#include "opt_kern_tls.h"
+#include <sys/param.h>
+#include <sys/module.h>
+#include <sys/kernel.h>
+#ifdef TCP_HHOOK
+#include <sys/hhook.h>
+#endif
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/proc.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#ifdef KERN_TLS
+#include <sys/ktls.h>
+#endif
+#include <sys/sysctl.h>
+#include <sys/systm.h>
+#include <sys/qmath.h>
+#include <sys/tree.h>
+#ifdef NETFLIX_STATS
+#include <sys/stats.h> /* Must come after qmath.h and tree.h */
+#endif
+#include <sys/refcount.h>
+#include <sys/queue.h>
+#include <sys/eventhandler.h>
+#include <sys/smp.h>
+#include <sys/kthread.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/tim_filter.h>
+#include <sys/time.h>
+#include <vm/uma.h>
+#include <sys/kern_prefetch.h>
+
+#include <net/route.h>
+#include <net/vnet.h>
+
+#define TCPSTATES /* for logging */
+
+#include <netinet/in.h>
+#include <netinet/in_kdtrace.h>
+#include <netinet/in_pcb.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h> /* required for icmp_var.h */
+#include <netinet/icmp_var.h> /* for ICMP_BANDLIM */
+#include <netinet/ip_var.h>
+#include <netinet/ip6.h>
+#include <netinet6/in6_pcb.h>
+#include <netinet6/ip6_var.h>
+#define TCPOUTFLAGS
+#include <netinet/tcp.h>
+#include <netinet/tcp_fsm.h>
+#include <netinet/tcp_seq.h>
+#include <netinet/tcp_timer.h>
+#include <netinet/tcp_var.h>
+#include <netinet/tcpip.h>
+#include <netinet/tcp_hpts.h>
+#include <netinet/cc/cc.h>
+#include <netinet/tcp_log_buf.h>
+#include <netinet/tcp_ratelimit.h>
+#include <netinet/tcp_lro.h>
+#ifdef TCPDEBUG
+#include <netinet/tcp_debug.h>
+#endif /* TCPDEBUG */
+#ifdef TCP_OFFLOAD
+#include <netinet/tcp_offload.h>
+#endif
+#ifdef INET6
+#include <netinet6/tcp6_var.h>
+#endif
+#include <netinet/tcp_fastopen.h>
+
+#include <netipsec/ipsec_support.h>
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/ethernet.h>
+
+#if defined(IPSEC) || defined(IPSEC_SUPPORT)
+#include <netipsec/ipsec.h>
+#include <netipsec/ipsec6.h>
+#endif /* IPSEC */
+
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <machine/in_cksum.h>
+
+#ifdef MAC
+#include <security/mac/mac_framework.h>
+#endif
+
+#include "sack_filter.h"
+#include "tcp_bbr.h"
+#include "rack_bbr_common.h"
+uma_zone_t bbr_zone;
+uma_zone_t bbr_pcb_zone;
+
+struct sysctl_ctx_list bbr_sysctl_ctx;
+struct sysctl_oid *bbr_sysctl_root;
+
+#define TCPT_RANGESET_NOSLOP(tv, value, tvmin, tvmax) do { \
+ (tv) = (value); \
+ if ((u_long)(tv) < (u_long)(tvmin)) \
+ (tv) = (tvmin); \
+ if ((u_long)(tv) > (u_long)(tvmax)) \
+ (tv) = (tvmax); \
+} while(0)
+
+/*#define BBR_INVARIANT 1*/
+
+/*
+ * initial window
+ */
+static uint32_t bbr_def_init_win = 10;
+static int32_t bbr_persist_min = 250000; /* 250ms */
+static int32_t bbr_persist_max = 1000000; /* 1 Second */
+static int32_t bbr_cwnd_may_shrink = 0;
+static int32_t bbr_cwndtarget_rtt_touse = BBR_RTT_PROP;
+static int32_t bbr_num_pktepo_for_del_limit = BBR_NUM_RTTS_FOR_DEL_LIMIT;
+static int32_t bbr_hardware_pacing_limit = 8000;
+static int32_t bbr_quanta = 3; /* How much extra quanta do we get? */
+static int32_t bbr_no_retran = 0;
+static int32_t bbr_tcp_map_entries_limit = 1500;
+static int32_t bbr_tcp_map_split_limit = 256;
+
+static int32_t bbr_error_base_paceout = 10000; /* usec to pace */
+static int32_t bbr_max_net_error_cnt = 10;
+/* Should the following be dynamic too -- loss wise */
+static int32_t bbr_rtt_gain_thresh = 0;
+/* Measurement controls */
+static int32_t bbr_use_google_algo = 1;
+static int32_t bbr_ts_limiting = 1;
+static int32_t bbr_ts_can_raise = 0;
+static int32_t bbr_do_red = 600;
+static int32_t bbr_red_scale = 20000;
+static int32_t bbr_red_mul = 1;
+static int32_t bbr_red_div = 2;
+static int32_t bbr_red_growth_restrict = 1;
+static int32_t bbr_target_is_bbunit = 0;
+static int32_t bbr_drop_limit = 0;
+/*
+ * How much gain do we need to see to
+ * stay in startup?
+ */
+static int32_t bbr_marks_rxt_sack_passed = 0;
+static int32_t bbr_start_exit = 25;
+static int32_t bbr_low_start_exit = 25; /* When we are in reduced gain */
+static int32_t bbr_startup_loss_thresh = 2000; /* 20.00% loss */
+static int32_t bbr_hptsi_max_mul = 1; /* These two mul/div assure a min pacing */
+static int32_t bbr_hptsi_max_div = 2; /* time, 0 means turned off. We need this
+ * if we go back ever to where the pacer
+ * has priority over timers.
+ */
+static int32_t bbr_policer_call_from_rack_to = 0;
+static int32_t bbr_policer_detection_enabled = 1;
+static int32_t bbr_min_measurements_req = 1; /* We need at least 2
+ * measurments before we are
+ * "good" note that 2 == 1.
+ * This is because we use a >
+ * comparison. This means if
+ * min_measure was 0, it takes
+ * num-measures > min(0) and
+ * you get 1 measurement and
+ * you are good. Set to 1, you
+ * have to have two
+ * measurements (this is done
+ * to prevent it from being ok
+ * to have no measurements). */
+static int32_t bbr_no_pacing_until = 4;
+
+static int32_t bbr_min_usec_delta = 20000; /* 20,000 usecs */
+static int32_t bbr_min_peer_delta = 20; /* 20 units */
+static int32_t bbr_delta_percent = 150; /* 15.0 % */
+
+static int32_t bbr_target_cwnd_mult_limit = 8;
+/*
+ * bbr_cwnd_min_val is the number of
+ * segments we hold to in the RTT probe
+ * state typically 4.
+ */
+static int32_t bbr_cwnd_min_val = BBR_PROBERTT_NUM_MSS;
+
+
+static int32_t bbr_cwnd_min_val_hs = BBR_HIGHSPEED_NUM_MSS;
+
+static int32_t bbr_gain_to_target = 1;
+static int32_t bbr_gain_gets_extra_too = 1;
+/*
+ * bbr_high_gain is the 2/ln(2) value we need
+ * to double the sending rate in startup. This
+ * is used for both cwnd and hptsi gain's.
+ */
+static int32_t bbr_high_gain = BBR_UNIT * 2885 / 1000 + 1;
+static int32_t bbr_startup_lower = BBR_UNIT * 1500 / 1000 + 1;
+static int32_t bbr_use_lower_gain_in_startup = 1;
+
+/* thresholds for reduction on drain in sub-states/drain */
+static int32_t bbr_drain_rtt = BBR_SRTT;
+static int32_t bbr_drain_floor = 88;
+static int32_t google_allow_early_out = 1;
+static int32_t google_consider_lost = 1;
+static int32_t bbr_drain_drop_mul = 4;
+static int32_t bbr_drain_drop_div = 5;
+static int32_t bbr_rand_ot = 50;
+static int32_t bbr_can_force_probertt = 0;
+static int32_t bbr_can_adjust_probertt = 1;
+static int32_t bbr_probertt_sets_rtt = 0;
+static int32_t bbr_can_use_ts_for_rtt = 1;
+static int32_t bbr_is_ratio = 0;
+static int32_t bbr_sub_drain_app_limit = 1;
+static int32_t bbr_prtt_slam_cwnd = 1;
+static int32_t bbr_sub_drain_slam_cwnd = 1;
+static int32_t bbr_slam_cwnd_in_main_drain = 1;
+static int32_t bbr_filter_len_sec = 6; /* How long does the rttProp filter
+ * hold */
+static uint32_t bbr_rtt_probe_limit = (USECS_IN_SECOND * 4);
+/*
+ * bbr_drain_gain is the reverse of the high_gain
+ * designed to drain back out the standing queue
+ * that is formed in startup by causing a larger
+ * hptsi gain and thus drainging the packets
+ * in flight.
+ */
+static int32_t bbr_drain_gain = BBR_UNIT * 1000 / 2885;
+static int32_t bbr_rttprobe_gain = 192;
+
+/*
+ * The cwnd_gain is the default cwnd gain applied when
+ * calculating a target cwnd. Note that the cwnd is
+ * a secondary factor in the way BBR works (see the
+ * paper and think about it, it will take some time).
+ * Basically the hptsi_gain spreads the packets out
+ * so you never get more than BDP to the peer even
+ * if the cwnd is high. In our implemenation that
+ * means in non-recovery/retransmission scenarios
+ * cwnd will never be reached by the flight-size.
+ */
+static int32_t bbr_cwnd_gain = BBR_UNIT * 2;
+static int32_t bbr_tlp_type_to_use = BBR_SRTT;
+static int32_t bbr_delack_time = 100000; /* 100ms in useconds */
+static int32_t bbr_sack_not_required = 0; /* set to one to allow non-sack to use bbr */
+static int32_t bbr_initial_bw_bps = 62500; /* 500kbps in bytes ps */
+static int32_t bbr_ignore_data_after_close = 1;
+static int16_t bbr_hptsi_gain[] = {
+ (BBR_UNIT *5 / 4),
+ (BBR_UNIT * 3 / 4),
+ BBR_UNIT,
+ BBR_UNIT,
+ BBR_UNIT,
+ BBR_UNIT,
+ BBR_UNIT,
+ BBR_UNIT
+};
+int32_t bbr_use_rack_resend_cheat = 1;
+int32_t bbr_sends_full_iwnd = 1;
+
+#define BBR_HPTSI_GAIN_MAX 8
+/*
+ * The BBR module incorporates a number of
+ * TCP ideas that have been put out into the IETF
+ * over the last few years:
+ * - Yuchung Cheng's RACK TCP (for which its named) that
+ * will stop us using the number of dup acks and instead
+ * use time as the gage of when we retransmit.
+ * - Reorder Detection of RFC4737 and the Tail-Loss probe draft
+ * of Dukkipati et.al.
+ * - Van Jacobson's et.al BBR.
+ *
+ * RACK depends on SACK, so if an endpoint arrives that
+ * cannot do SACK the state machine below will shuttle the
+ * connection back to using the "default" TCP stack that is
+ * in FreeBSD.
+ *
+ * To implement BBR and RACK the original TCP stack was first decomposed
+ * into a functional state machine with individual states
+ * for each of the possible TCP connection states. The do_segement
+ * functions role in life is to mandate the connection supports SACK
+ * initially and then assure that the RACK state matches the conenction
+ * state before calling the states do_segment function. Data processing
+ * of inbound segments also now happens in the hpts_do_segment in general
+ * with only one exception. This is so we can keep the connection on
+ * a single CPU.
+ *
+ * Each state is simplified due to the fact that the original do_segment
+ * has been decomposed and we *know* what state we are in (no
+ * switches on the state) and all tests for SACK are gone. This
+ * greatly simplifies what each state does.
+ *
+ * TCP output is also over-written with a new version since it
+ * must maintain the new rack scoreboard and has had hptsi
+ * integrated as a requirment. Still todo is to eliminate the
+ * use of the callout_() system and use the hpts for all
+ * timers as well.
+ */
+static uint32_t bbr_rtt_probe_time = 200000; /* 200ms in micro seconds */
+static uint32_t bbr_rtt_probe_cwndtarg = 4; /* How many mss's outstanding */
+static const int32_t bbr_min_req_free = 2; /* The min we must have on the
+ * free list */
+static int32_t bbr_tlp_thresh = 1;
+static int32_t bbr_reorder_thresh = 2;
+static int32_t bbr_reorder_fade = 60000000; /* 0 - never fade, def
+ * 60,000,000 - 60 seconds */
+static int32_t bbr_pkt_delay = 1000;
+static int32_t bbr_min_to = 1000; /* Number of usec's minimum timeout */
+static int32_t bbr_incr_timers = 1;
+
+static int32_t bbr_tlp_min = 10000; /* 10ms in usecs */
+static int32_t bbr_delayed_ack_time = 200000; /* 200ms in usecs */
+static int32_t bbr_exit_startup_at_loss = 1;
+
+/*
+ * bbr_lt_bw_ratio is 1/8th
+ * bbr_lt_bw_diff is < 4 Kbit/sec
+ */
+static uint64_t bbr_lt_bw_diff = 4000 / 8; /* In bytes per second */
+static uint64_t bbr_lt_bw_ratio = 8; /* For 1/8th */
+static uint32_t bbr_lt_bw_max_rtts = 48; /* How many rtt's do we use
+ * the lt_bw for */
+static uint32_t bbr_lt_intvl_min_rtts = 4; /* Min num of RTT's to measure
+ * lt_bw */
+static int32_t bbr_lt_intvl_fp = 0; /* False positive epoch diff */
+static int32_t bbr_lt_loss_thresh = 196; /* Lost vs delivered % */
+static int32_t bbr_lt_fd_thresh = 100; /* false detection % */
+
+static int32_t bbr_verbose_logging = 0;
+/*
+ * Currently regular tcp has a rto_min of 30ms
+ * the backoff goes 12 times so that ends up
+ * being a total of 122.850 seconds before a
+ * connection is killed.
+ */
+static int32_t bbr_rto_min_ms = 30; /* 30ms same as main freebsd */
+static int32_t bbr_rto_max_sec = 4; /* 4 seconds */
+
+/****************************************************/
+/* DEFAULT TSO SIZING (cpu performance impacting) */
+/****************************************************/
+/* What amount is our formula using to get TSO size */
+static int32_t bbr_hptsi_per_second = 1000;
+
+/*
+ * For hptsi under bbr_cross_over connections what is delay
+ * target 7ms (in usec) combined with a seg_max of 2
+ * gets us close to identical google behavior in
+ * TSO size selection (possibly more 1MSS sends).
+ */
+static int32_t bbr_hptsi_segments_delay_tar = 7000;
+
+/* Does pacing delay include overhead's in its time calculations? */
+static int32_t bbr_include_enet_oh = 0;
+static int32_t bbr_include_ip_oh = 1;
+static int32_t bbr_include_tcp_oh = 1;
+static int32_t bbr_google_discount = 10;
+
+/* Do we use (nf mode) pkt-epoch to drive us or rttProp? */
+static int32_t bbr_state_is_pkt_epoch = 0;
+static int32_t bbr_state_drain_2_tar = 1;
+/* What is the max the 0 - bbr_cross_over MBPS TSO target
+ * can reach using our delay target. Note that this
+ * value becomes the floor for the cross over
+ * algorithm.
+ */
+static int32_t bbr_hptsi_segments_max = 2;
+static int32_t bbr_hptsi_segments_floor = 1;
+static int32_t bbr_hptsi_utter_max = 0;
+
+/* What is the min the 0 - bbr_cross-over MBPS TSO target can be */
+static int32_t bbr_hptsi_bytes_min = 1460;
+static int32_t bbr_all_get_min = 0;
+
+/* Cross over point from algo-a to algo-b */
+static uint32_t bbr_cross_over = TWENTY_THREE_MBPS;
+
+/* Do we deal with our restart state? */
+static int32_t bbr_uses_idle_restart = 0;
+static int32_t bbr_idle_restart_threshold = 100000; /* 100ms in useconds */
+
+/* Do we allow hardware pacing? */
+static int32_t bbr_allow_hdwr_pacing = 0;
+static int32_t bbr_hdwr_pace_adjust = 2; /* multipler when we calc the tso size */
+static int32_t bbr_hdwr_pace_floor = 1;
+static int32_t bbr_hdwr_pacing_delay_cnt = 10;
+
+/****************************************************/
+static int32_t bbr_resends_use_tso = 0;
+static int32_t bbr_tlp_max_resend = 2;
+static int32_t bbr_sack_block_limit = 128;
+
+#define BBR_MAX_STAT 19
+counter_u64_t bbr_state_time[BBR_MAX_STAT];
+counter_u64_t bbr_state_lost[BBR_MAX_STAT];
+counter_u64_t bbr_state_resend[BBR_MAX_STAT];
+counter_u64_t bbr_stat_arry[BBR_STAT_SIZE];
+counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE];
+counter_u64_t bbr_out_size[TCP_MSS_ACCT_SIZE];
+counter_u64_t bbr_flows_whdwr_pacing;
+counter_u64_t bbr_flows_nohdwr_pacing;
+
+counter_u64_t bbr_nohdwr_pacing_enobuf;
+counter_u64_t bbr_hdwr_pacing_enobuf;
+
+static inline uint64_t bbr_get_bw(struct tcp_bbr *bbr);
+
+/*
+ * Static defintions we need for forward declarations.
+ */
+static uint32_t
+bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain,
+ uint32_t useconds_time, uint64_t bw);
+static uint32_t
+bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain);
+static void
+ bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win);
+static void
+bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses);
+static void
+bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int line,
+ int dolog);
+static uint32_t
+bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain);
+static void
+bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch,
+ int32_t pkt_epoch, uint32_t losses);
+static uint32_t
+bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm);
+static uint32_t bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp);
+static uint32_t
+bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr,
+ struct bbr_sendmap *rsm, uint32_t srtt,
+ uint32_t cts);
+static void
+bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts,
+ int32_t line);
+static void
+ bbr_set_state_target(struct tcp_bbr *bbr, int line);
+static void
+ bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line);
+
+static void
+ bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line);
+
+static void
+ tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts);
+
+static void
+ bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts);
+
+static void
+ bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, uint32_t rtt,
+ uint32_t line, uint8_t is_start, uint16_t set);
+
+static struct bbr_sendmap *
+ bbr_find_lowest_rsm(struct tcp_bbr *bbr);
+static __inline uint32_t
+bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type);
+static void
+ bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which);
+
+static void
+bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt,
+ uint32_t thresh, uint32_t to);
+static void
+ bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag);
+
+static void
+bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot,
+ uint32_t del_by, uint32_t cts, uint32_t sloton, uint32_t prev_delay);
+
+static void
+bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr,
+ uint32_t cts, int32_t line);
+static void
+ bbr_stop_all_timers(struct tcpcb *tp);
+static void
+ bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts);
+static void
+ bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts);
+static void
+ bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts);
+
+
+static void
+bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len,
+ uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod);
+
+static inline uint8_t
+bbr_state_val(struct tcp_bbr *bbr)
+{
+ return(bbr->rc_bbr_substate);
+}
+
+static inline uint32_t
+get_min_cwnd(struct tcp_bbr *bbr)
+{
+ int mss;
+
+ mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs);
+ if (bbr_get_rtt(bbr, BBR_RTT_PROP) < BBR_HIGH_SPEED)
+ return (bbr_cwnd_min_val_hs * mss);
+ else
+ return (bbr_cwnd_min_val * mss);
+}
+
+static uint32_t
+bbr_get_persists_timer_val(struct tcpcb *tp, struct tcp_bbr *bbr)
+{
+ uint64_t srtt, var;
+ uint64_t ret_val;
+
+ bbr->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT;
+ if (tp->t_srtt == 0) {
+ srtt = (uint64_t)BBR_INITIAL_RTO;
+ var = 0;
+ } else {
+ srtt = ((uint64_t)TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT);
+ var = ((uint64_t)TICKS_2_USEC(tp->t_rttvar) >> TCP_RTT_SHIFT);
+ }
+ TCPT_RANGESET_NOSLOP(ret_val, ((srtt + var) * tcp_backoff[tp->t_rxtshift]),
+ bbr_persist_min, bbr_persist_max);
+ return ((uint32_t)ret_val);
+}
+
+static uint32_t
+bbr_timer_start(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ /*
+ * Start the FR timer, we do this based on getting the first one in
+ * the rc_tmap. Note that if its NULL we must stop the timer. in all
+ * events we need to stop the running timer (if its running) before
+ * starting the new one.
+ */
+ uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse;
+ int32_t idx;
+ int32_t is_tlp_timer = 0;
+ struct bbr_sendmap *rsm;
+
+ if (bbr->rc_all_timers_stopped) {
+ /* All timers have been stopped none are to run */
+ return (0);
+ }
+ if (bbr->rc_in_persist) {
+ /* We can't start any timer in persists */
+ return (bbr_get_persists_timer_val(tp, bbr));
+ }
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap);
+ if ((rsm == NULL) ||
+ ((tp->t_flags & TF_SACK_PERMIT) == 0) ||
+ (tp->t_state < TCPS_ESTABLISHED)) {
+ /* Nothing on the send map */
+activate_rxt:
+ if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) {
+ uint64_t tov;
+
+ time_since_sent = 0;
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap);
+ if (rsm) {
+ idx = rsm->r_rtr_cnt - 1;
+ if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time))
+ tstmp_touse = rsm->r_tim_lastsent[idx];
+ else
+ tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time;
+ if (TSTMP_GT(tstmp_touse, cts))
+ time_since_sent = cts - tstmp_touse;
+ }
+ bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RXT;
+ if (tp->t_srtt == 0)
+ tov = BBR_INITIAL_RTO;
+ else
+ tov = ((uint64_t)(TICKS_2_USEC(tp->t_srtt) +
+ ((uint64_t)TICKS_2_USEC(tp->t_rttvar) * (uint64_t)4)) >> TCP_RTT_SHIFT);
+ if (tp->t_rxtshift)
+ tov *= tcp_backoff[tp->t_rxtshift];
+ if (tov > time_since_sent)
+ tov -= time_since_sent;
+ else
+ tov = bbr->r_ctl.rc_min_to;
+ TCPT_RANGESET_NOSLOP(to, tov,
+ (bbr->r_ctl.rc_min_rto_ms * MS_IN_USEC),
+ (bbr->rc_max_rto_sec * USECS_IN_SECOND));
+ bbr_log_timer_var(bbr, 2, cts, 0, srtt, 0, to);
+ return (to);
+ }
+ return (0);
+ }
+ if (rsm->r_flags & BBR_ACKED) {
+ rsm = bbr_find_lowest_rsm(bbr);
+ if (rsm == NULL) {
+ /* No lowest? */
+ goto activate_rxt;
+ }
+ }
+ /* Convert from ms to usecs */
+ if (rsm->r_flags & BBR_SACK_PASSED) {
+ if ((tp->t_flags & TF_SENTFIN) &&
+ ((tp->snd_max - tp->snd_una) == 1) &&
+ (rsm->r_flags & BBR_HAS_FIN)) {
+ /*
+ * We don't start a bbr rack timer if all we have is
+ * a FIN outstanding.
+ */
+ goto activate_rxt;
+ }
+ srtt = bbr_get_rtt(bbr, BBR_RTT_RACK);
+ thresh = bbr_calc_thresh_rack(bbr, srtt, cts, rsm);
+ idx = rsm->r_rtr_cnt - 1;
+ exp = rsm->r_tim_lastsent[idx] + thresh;
+ if (SEQ_GEQ(exp, cts)) {
+ to = exp - cts;
+ if (to < bbr->r_ctl.rc_min_to) {
+ to = bbr->r_ctl.rc_min_to;
+ }
+ } else {
+ to = bbr->r_ctl.rc_min_to;
+ }
+ } else {
+ /* Ok we need to do a TLP not RACK */
+ if (bbr->rc_tlp_in_progress != 0) {
+ /*
+ * The previous send was a TLP.
+ */
+ goto activate_rxt;
+ }
+ rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext);
+ if (rsm == NULL) {
+ /* We found no rsm to TLP with. */
+ goto activate_rxt;
+ }
+ if (rsm->r_flags & BBR_HAS_FIN) {
+ /* If its a FIN we don't do TLP */
+ rsm = NULL;
+ goto activate_rxt;
+ }
+ time_since_sent = 0;
+ idx = rsm->r_rtr_cnt - 1;
+ if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time))
+ tstmp_touse = rsm->r_tim_lastsent[idx];
+ else
+ tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time;
+ if (TSTMP_GT(tstmp_touse, cts))
+ time_since_sent = cts - tstmp_touse;
+ is_tlp_timer = 1;
+ srtt = bbr_get_rtt(bbr, bbr_tlp_type_to_use);
+ thresh = bbr_calc_thresh_tlp(tp, bbr, rsm, srtt, cts);
+ if (thresh > time_since_sent)
+ to = thresh - time_since_sent;
+ else
+ to = bbr->r_ctl.rc_min_to;
+ if (to > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) {
+ /*
+ * If the TLP time works out to larger than the max
+ * RTO lets not do TLP.. just RTO.
+ */
+ goto activate_rxt;
+ }
+ if ((bbr->rc_tlp_rtx_out == 1) &&
+ (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq)) {
+ /*
+ * Second retransmit of the same TLP
+ * lets not.
+ */
+ bbr->rc_tlp_rtx_out = 0;
+ goto activate_rxt;
+ }
+ if (rsm->r_start != bbr->r_ctl.rc_last_tlp_seq) {
+ /*
+ * The tail is no longer the last one I did a probe
+ * on
+ */
+ bbr->r_ctl.rc_tlp_seg_send_cnt = 0;
+ bbr->r_ctl.rc_last_tlp_seq = rsm->r_start;
+ }
+ }
+ if (is_tlp_timer == 0) {
+ BBR_STAT_INC(bbr_to_arm_rack);
+ bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RACK;
+ } else {
+ bbr_log_timer_var(bbr, 1, cts, time_since_sent, srtt, thresh, to);
+ if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) {
+ /*
+ * We have exceeded how many times we can retran the
+ * current TLP timer, switch to the RTO timer.
+ */
+ goto activate_rxt;
+ } else {
+ BBR_STAT_INC(bbr_to_arm_tlp);
+ bbr->r_ctl.rc_hpts_flags |= PACE_TMR_TLP;
+ }
+ }
+ return (to);
+}
+
+static inline int32_t
+bbr_minseg(struct tcp_bbr *bbr)
+{
+ return (bbr->r_ctl.rc_pace_min_segs - bbr->rc_last_options);
+}
+
+static void
+bbr_start_hpts_timer(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts, int32_t frm, int32_t slot, uint32_t tot_len)
+{
+ struct inpcb *inp;
+ struct hpts_diag diag;
+ uint32_t delayed_ack = 0;
+ uint32_t left = 0;
+ uint32_t hpts_timeout;
+ uint8_t stopped;
+ int32_t delay_calc = 0;
+ uint32_t prev_delay = 0;
+
+ inp = tp->t_inpcb;
+ if (inp->inp_in_hpts) {
+ /* A previous call is already set up */
+ return;
+ }
+ if ((tp->t_state == TCPS_CLOSED) ||
+ (tp->t_state == TCPS_LISTEN)) {
+ return;
+ }
+ stopped = bbr->rc_tmr_stopped;
+ if (stopped && TSTMP_GT(bbr->r_ctl.rc_timer_exp, cts)) {
+ left = bbr->r_ctl.rc_timer_exp - cts;
+ }
+ bbr->r_ctl.rc_hpts_flags = 0;
+ bbr->r_ctl.rc_timer_exp = 0;
+ prev_delay = bbr->r_ctl.rc_last_delay_val;
+ if (bbr->r_ctl.rc_last_delay_val &&
+ (slot == 0)) {
+ /*
+ * If a previous pacer delay was in place we
+ * are not coming from the output side (where
+ * we calculate a delay, more likely a timer).
+ */
+ slot = bbr->r_ctl.rc_last_delay_val;
+ if (TSTMP_GT(cts, bbr->rc_pacer_started)) {
+ /* Compensate for time passed */
+ delay_calc = cts - bbr->rc_pacer_started;
+ if (delay_calc <= slot)
+ slot -= delay_calc;
+ }
+ }
+ /* Do we have early to make up for by pushing out the pacing time? */
+ if (bbr->r_agg_early_set) {
+ bbr_log_pacing_delay_calc(bbr, 0, bbr->r_ctl.rc_agg_early, cts, slot, 0, bbr->r_agg_early_set, 2);
+ slot += bbr->r_ctl.rc_agg_early;
+ bbr->r_ctl.rc_agg_early = 0;
+ bbr->r_agg_early_set = 0;
+ }
+ /* Are we running a total debt that needs to be compensated for? */
+ if (bbr->r_ctl.rc_hptsi_agg_delay) {
+ if (slot > bbr->r_ctl.rc_hptsi_agg_delay) {
+ /* We nuke the delay */
+ slot -= bbr->r_ctl.rc_hptsi_agg_delay;
+ bbr->r_ctl.rc_hptsi_agg_delay = 0;
+ } else {
+ /* We nuke some of the delay, put in a minimal 100usecs */
+ bbr->r_ctl.rc_hptsi_agg_delay -= slot;
+ bbr->r_ctl.rc_last_delay_val = slot = 100;
+ }
+ }
+ bbr->r_ctl.rc_last_delay_val = slot;
+ hpts_timeout = bbr_timer_start(tp, bbr, cts);
+ if (tp->t_flags & TF_DELACK) {
+ if (bbr->rc_in_persist == 0) {
+ delayed_ack = bbr_delack_time;
+ } else {
+ /*
+ * We are in persists and have
+ * gotten a new data element.
+ */
+ if (hpts_timeout > bbr_delack_time) {
+ /*
+ * Lets make the persists timer (which acks)
+ * be the smaller of hpts_timeout and bbr_delack_time.
+ */
+ hpts_timeout = bbr_delack_time;
+ }
+ }
+ }
+ if (delayed_ack &&
+ ((hpts_timeout == 0) ||
+ (delayed_ack < hpts_timeout))) {
+ /* We need a Delayed ack timer */
+ bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK;
+ hpts_timeout = delayed_ack;
+ }
+ if (slot) {
+ /* Mark that we have a pacing timer up */
+ BBR_STAT_INC(bbr_paced_segments);
+ bbr->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT;
+ }
+ /*
+ * If no timers are going to run and we will fall off thfe hptsi
+ * wheel, we resort to a keep-alive timer if its configured.
+ */
+ if ((hpts_timeout == 0) &&
+ (slot == 0)) {
+ if ((tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
+ (tp->t_state <= TCPS_CLOSING)) {
+ /*
+ * Ok we have no timer (persists, rack, tlp, rxt or
+ * del-ack), we don't have segments being paced. So
+ * all that is left is the keepalive timer.
+ */
+ if (TCPS_HAVEESTABLISHED(tp->t_state)) {
+ hpts_timeout = TICKS_2_USEC(TP_KEEPIDLE(tp));
+ } else {
+ hpts_timeout = TICKS_2_USEC(TP_KEEPINIT(tp));
+ }
+ bbr->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP;
+ }
+ }
+ if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) ==
+ (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK)) {
+ /*
+ * RACK, TLP, persists and RXT timers all are restartable
+ * based on actions input .. i.e we received a packet (ack
+ * or sack) and that changes things (rw, or snd_una etc).
+ * Thus we can restart them with a new value. For
+ * keep-alive, delayed_ack we keep track of what was left
+ * and restart the timer with a smaller value.
+ */
+ if (left < hpts_timeout)
+ hpts_timeout = left;
+ }
+ if (bbr->r_ctl.rc_incr_tmrs && slot &&
+ (bbr->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) {
+ /*
+ * If configured to do so, and the timer is either
+ * the TLP or RXT timer, we need to increase the timeout
+ * by the pacing time. Consider the bottleneck at my
+ * machine as an example, we are sending something
+ * to start a TLP on. The last packet won't be emitted
+ * fully until the pacing time (the bottleneck will hold
+ * the data in place). Once the packet is emitted that
+ * is when we want to start waiting for the TLP. This
+ * is most evident with hardware pacing (where the nic
+ * is holding the packet(s) before emitting). But it
+ * can also show up in the network so we do it for all
+ * cases. Technically we would take off one packet from
+ * this extra delay but this is easier and being more
+ * conservative is probably better.
+ */
+ hpts_timeout += slot;
+ }
+ if (hpts_timeout) {
+ /*
+ * Hack alert for now we can't time-out over 2147 seconds (a
+ * bit more than 35min)
+ */
+ if (hpts_timeout > 0x7ffffffe)
+ hpts_timeout = 0x7ffffffe;
+ bbr->r_ctl.rc_timer_exp = cts + hpts_timeout;
+ } else
+ bbr->r_ctl.rc_timer_exp = 0;
+ if ((slot) &&
+ (bbr->rc_use_google ||
+ bbr->output_error_seen ||
+ (slot <= hpts_timeout)) ) {
+ /*
+ * Tell LRO that it can queue packets while
+ * we pace.
+ */
+ bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
+ if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) &&
+ (bbr->rc_cwnd_limited == 0)) {
+ /*
+ * If we are not cwnd limited and we
+ * are running a rack timer we put on
+ * the do not disturbe even for sack.
+ */
+ inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
+ } else
+ inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
+ bbr->rc_pacer_started = cts;
+
+ (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(slot),
+ __LINE__, &diag);
+ bbr->rc_timer_first = 0;
+ bbr->bbr_timer_src = frm;
+ bbr_log_to_start(bbr, cts, hpts_timeout, slot, 1);
+ bbr_log_hpts_diag(bbr, cts, &diag);
+ } else if (hpts_timeout) {
+ (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(hpts_timeout),
+ __LINE__, &diag);
+ /*
+ * We add the flag here as well if the slot is set,
+ * since hpts will call in to clear the queue first before
+ * calling the output routine (which does our timers).
+ * We don't want to set the flag if its just a timer
+ * else the arrival of data might (that causes us
+ * to send more) might get delayed. Imagine being
+ * on a keep-alive timer and a request comes in for
+ * more data.
+ */
+ if (slot)
+ bbr->rc_pacer_started = cts;
+ if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) &&
+ (bbr->rc_cwnd_limited == 0)) {
+ /*
+ * For a rack timer, don't wake us even
+ * if a sack arrives as long as we are
+ * not cwnd limited.
+ */
+ bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
+ inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
+ } else {
+ /* All other timers wake us up */
+ bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
+ inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
+ }
+ bbr->bbr_timer_src = frm;
+ bbr_log_to_start(bbr, cts, hpts_timeout, slot, 0);
+ bbr_log_hpts_diag(bbr, cts, &diag);
+ bbr->rc_timer_first = 1;
+ }
+ bbr->rc_tmr_stopped = 0;
+ bbr_log_type_bbrsnd(bbr, tot_len, slot, delay_calc, cts, frm, prev_delay);
+}
+
+static void
+bbr_timer_audit(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, struct sockbuf *sb)
+{
+ /*
+ * We received an ack, and then did not call send or were bounced
+ * out due to the hpts was running. Now a timer is up as well, is it
+ * the right timer?
+ */
+ struct inpcb *inp;
+ struct bbr_sendmap *rsm;
+ uint32_t hpts_timeout;
+ int tmr_up;
+
+ tmr_up = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
+ if (bbr->rc_in_persist && (tmr_up == PACE_TMR_PERSIT))
+ return;
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap);
+ if (((rsm == NULL) || (tp->t_state < TCPS_ESTABLISHED)) &&
+ (tmr_up == PACE_TMR_RXT)) {
+ /* Should be an RXT */
+ return;
+ }
+ inp = bbr->rc_inp;
+ if (rsm == NULL) {
+ /* Nothing outstanding? */
+ if (tp->t_flags & TF_DELACK) {
+ if (tmr_up == PACE_TMR_DELACK)
+ /*
+ * We are supposed to have delayed ack up
+ * and we do
+ */
+ return;
+ } else if (sbavail(&inp->inp_socket->so_snd) &&
+ (tmr_up == PACE_TMR_RXT)) {
+ /*
+ * if we hit enobufs then we would expect the
+ * possiblity of nothing outstanding and the RXT up
+ * (and the hptsi timer).
+ */
+ return;
+ } else if (((tcp_always_keepalive ||
+ inp->inp_socket->so_options & SO_KEEPALIVE) &&
+ (tp->t_state <= TCPS_CLOSING)) &&
+ (tmr_up == PACE_TMR_KEEP) &&
+ (tp->snd_max == tp->snd_una)) {
+ /* We should have keep alive up and we do */
+ return;
+ }
+ }
+ if (rsm && (rsm->r_flags & BBR_SACK_PASSED)) {
+ if ((tp->t_flags & TF_SENTFIN) &&
+ ((tp->snd_max - tp->snd_una) == 1) &&
+ (rsm->r_flags & BBR_HAS_FIN)) {
+ /* needs to be a RXT */
+ if (tmr_up == PACE_TMR_RXT)
+ return;
+ else
+ goto wrong_timer;
+ } else if (tmr_up == PACE_TMR_RACK)
+ return;
+ else
+ goto wrong_timer;
+ } else if (rsm && (tmr_up == PACE_TMR_RACK)) {
+ /* Rack timer has priority if we have data out */
+ return;
+ } else if (SEQ_GT(tp->snd_max, tp->snd_una) &&
+ ((tmr_up == PACE_TMR_TLP) ||
+ (tmr_up == PACE_TMR_RXT))) {
+ /*
+ * Either a TLP or RXT is fine if no sack-passed is in place
+ * and data is outstanding.
+ */
+ return;
+ } else if (tmr_up == PACE_TMR_DELACK) {
+ /*
+ * If the delayed ack was going to go off before the
+ * rtx/tlp/rack timer were going to expire, then that would
+ * be the timer in control. Note we don't check the time
+ * here trusting the code is correct.
+ */
+ return;
+ }
+ if (SEQ_GT(tp->snd_max, tp->snd_una) &&
+ ((tmr_up == PACE_TMR_RXT) ||
+ (tmr_up == PACE_TMR_TLP) ||
+ (tmr_up == PACE_TMR_RACK))) {
+ /*
+ * We have outstanding data and
+ * we *do* have a RACK, TLP or RXT
+ * timer running. We won't restart
+ * anything here since thats probably ok we
+ * will get called with some timer here shortly.
+ */
+ return;
+ }
+ /*
+ * Ok the timer originally started is not what we want now. We will
+ * force the hpts to be stopped if any, and restart with the slot
+ * set to what was in the saved slot.
+ */
+wrong_timer:
+ if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) {
+ if (inp->inp_in_hpts)
+ tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT);
+ bbr_timer_cancel(bbr, __LINE__, cts);
+ bbr_start_hpts_timer(bbr, tp, cts, 1, bbr->r_ctl.rc_last_delay_val,
+ 0);
+ } else {
+ /*
+ * Output is hptsi so we just need to switch the type of
+ * timer. We don't bother with keep-alive, since when we
+ * jump through the output, it will start the keep-alive if
+ * nothing is sent.
+ *
+ * We only need a delayed-ack added and or the hpts_timeout.
+ */
+ hpts_timeout = bbr_timer_start(tp, bbr, cts);
+ if (tp->t_flags & TF_DELACK) {
+ if (hpts_timeout == 0) {
+ hpts_timeout = bbr_delack_time;
+ bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK;
+ }
+ else if (hpts_timeout > bbr_delack_time) {
+ hpts_timeout = bbr_delack_time;
+ bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK;
+ }
+ }
+ if (hpts_timeout) {
+ if (hpts_timeout > 0x7ffffffe)
+ hpts_timeout = 0x7ffffffe;
+ bbr->r_ctl.rc_timer_exp = cts + hpts_timeout;
+ }
+ }
+}
+
+int32_t bbr_clear_lost = 0;
+
+/*
+ * Considers the two time values now (cts) and earlier.
+ * If cts is smaller than earlier, we could have
+ * had a sequence wrap (our counter wraps every
+ * 70 min or so) or it could be just clock skew
+ * getting us two differnt time values. Clock skew
+ * will show up within 10ms or so. So in such
+ * a case (where cts is behind earlier time by
+ * less than 10ms) we return 0. Otherwise we
+ * return the true difference between them.
+ */
+static inline uint32_t
+bbr_calc_time(uint32_t cts, uint32_t earlier_time) {
+ /*
+ * Given two timestamps, the current time stamp cts, and some other
+ * time-stamp taken in theory earlier return the difference. The
+ * trick is here sometimes locking will get the other timestamp
+ * after the cts. If this occurs we need to return 0.
+ */
+ if (TSTMP_GEQ(cts, earlier_time))
+ return (cts - earlier_time);
+ /*
+ * cts is behind earlier_time if its less than 10ms consider it 0.
+ * If its more than 10ms difference then we had a time wrap. Else
+ * its just the normal locking foo. I wonder if we should not go to
+ * 64bit TS and get rid of this issue.
+ */
+ if (TSTMP_GEQ((cts + 10000), earlier_time))
+ return (0);
+ /*
+ * Ok the time must have wrapped. So we need to answer a large
+ * amount of time, which the normal subtraction should do.
+ */
+ return (cts - earlier_time);
+}
+
+
+
+static int
+sysctl_bbr_clear_lost(SYSCTL_HANDLER_ARGS)
+{
+ uint32_t stat;
+ int32_t error;
+
+ error = SYSCTL_OUT(req, &bbr_clear_lost, sizeof(uint32_t));
+ if (error || req->newptr == NULL)
+ return error;
+
+ error = SYSCTL_IN(req, &stat, sizeof(uint32_t));
+ if (error)
+ return (error);
+ if (stat == 1) {
+#ifdef BBR_INVARIANTS
+ printf("Clearing BBR lost counters\n");
+#endif
+ COUNTER_ARRAY_ZERO(bbr_state_lost, BBR_MAX_STAT);
+ COUNTER_ARRAY_ZERO(bbr_state_time, BBR_MAX_STAT);
+ COUNTER_ARRAY_ZERO(bbr_state_resend, BBR_MAX_STAT);
+ } else if (stat == 2) {
+#ifdef BBR_INVARIANTS
+ printf("Clearing BBR option counters\n");
+#endif
+ COUNTER_ARRAY_ZERO(bbr_opts_arry, BBR_OPTS_SIZE);
+ } else if (stat == 3) {
+#ifdef BBR_INVARIANTS
+ printf("Clearing BBR stats counters\n");
+#endif
+ COUNTER_ARRAY_ZERO(bbr_stat_arry, BBR_STAT_SIZE);
+ } else if (stat == 4) {
+#ifdef BBR_INVARIANTS
+ printf("Clearing BBR out-size counters\n");
+#endif
+ COUNTER_ARRAY_ZERO(bbr_out_size, TCP_MSS_ACCT_SIZE);
+ }
+ bbr_clear_lost = 0;
+ return (0);
+}
+
+static void
+bbr_init_sysctls()
+{
+ struct sysctl_oid *bbr_probertt;
+ struct sysctl_oid *bbr_hptsi;
+ struct sysctl_oid *bbr_measure;
+ struct sysctl_oid *bbr_cwnd;
+ struct sysctl_oid *bbr_timeout;
+ struct sysctl_oid *bbr_states;
+ struct sysctl_oid *bbr_startup;
+ struct sysctl_oid *bbr_policer;
+
+ /* Probe rtt controls */
+ bbr_probertt = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "probertt",
+ CTLFLAG_RW, 0,
+ "");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "gain", CTLFLAG_RW,
+ &bbr_rttprobe_gain, 192,
+ "What is the filter gain drop in probe_rtt (0=disable)?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "cwnd", CTLFLAG_RW,
+ &bbr_rtt_probe_cwndtarg, 4,
+ "How many mss's are outstanding during probe-rtt");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "int", CTLFLAG_RW,
+ &bbr_rtt_probe_limit, 4000000,
+ "If RTT has not shrank in this many micro-seconds enter probe-rtt");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "mintime", CTLFLAG_RW,
+ &bbr_rtt_probe_time, 200000,
+ "How many microseconds in probe-rtt");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "filter_len_sec", CTLFLAG_RW,
+ &bbr_filter_len_sec, 6,
+ "How long in seconds does the rttProp filter run?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "drain_rtt", CTLFLAG_RW,
+ &bbr_drain_rtt, BBR_SRTT,
+ "What is the drain rtt to use in probeRTT (rtt_prop=0, rtt_rack=1, rtt_pkt=2, rtt_srtt=3?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "can_force", CTLFLAG_RW,
+ &bbr_can_force_probertt, 0,
+ "If we keep setting new low rtt's but delay going in probe-rtt can we force in??");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "enter_sets_force", CTLFLAG_RW,
+ &bbr_probertt_sets_rtt, 0,
+ "In NF mode, do we imitate google_mode and set the rttProp on entry to probe-rtt?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "can_adjust", CTLFLAG_RW,
+ &bbr_can_adjust_probertt, 1,
+ "Can we dynamically adjust the probe-rtt limits and times?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "is_ratio", CTLFLAG_RW,
+ &bbr_is_ratio, 0,
+ "is the limit to filter a ratio?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "use_cwnd", CTLFLAG_RW,
+ &bbr_prtt_slam_cwnd, 0,
+ "Should we set/recover cwnd?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_probertt),
+ OID_AUTO, "can_use_ts", CTLFLAG_RW,
+ &bbr_can_use_ts_for_rtt, 1,
+ "Can we use the ms timestamp if available for retransmistted rtt calculations?");
+
+ /* Pacing controls */
+ bbr_hptsi = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "pacing",
+ CTLFLAG_RW, 0,
+ "");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "hw_pacing", CTLFLAG_RW,
+ &bbr_allow_hdwr_pacing, 1,
+ "Do we allow hardware pacing?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "hw_pacing_limit", CTLFLAG_RW,
+ &bbr_hardware_pacing_limit, 4000,
+ "Do we have a limited number of connections for pacing chelsio (0=no limit)?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "hw_pacing_adj", CTLFLAG_RW,
+ &bbr_hdwr_pace_adjust, 2,
+ "Multiplier to calculated tso size?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "hw_pacing_floor", CTLFLAG_RW,
+ &bbr_hdwr_pace_floor, 1,
+ "Do we invoke the hardware pacing floor?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "hw_pacing_delay_cnt", CTLFLAG_RW,
+ &bbr_hdwr_pacing_delay_cnt, 10,
+ "How many packets must be sent after hdwr pacing is enabled");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "bw_cross", CTLFLAG_RW,
+ &bbr_cross_over, 3000000,
+ "What is the point where we cross over to linux like TSO size set");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "seg_deltarg", CTLFLAG_RW,
+ &bbr_hptsi_segments_delay_tar, 7000,
+ "What is the worse case delay target for hptsi < 48Mbp connections");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "enet_oh", CTLFLAG_RW,
+ &bbr_include_enet_oh, 0,
+ "Do we include the ethernet overhead in calculating pacing delay?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "ip_oh", CTLFLAG_RW,
+ &bbr_include_ip_oh, 1,
+ "Do we include the IP overhead in calculating pacing delay?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "tcp_oh", CTLFLAG_RW,
+ &bbr_include_tcp_oh, 0,
+ "Do we include the TCP overhead in calculating pacing delay?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "google_discount", CTLFLAG_RW,
+ &bbr_google_discount, 10,
+ "What is the default google discount percentage wise for pacing (11 = 1.1%%)?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "all_get_min", CTLFLAG_RW,
+ &bbr_all_get_min, 0,
+ "If you are less than a MSS do you just get the min?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "tso_min", CTLFLAG_RW,
+ &bbr_hptsi_bytes_min, 1460,
+ "For 0 -> 24Mbps what is floor number of segments for TSO");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "seg_tso_max", CTLFLAG_RW,
+ &bbr_hptsi_segments_max, 6,
+ "For 0 -> 24Mbps what is top number of segments for TSO");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "seg_floor", CTLFLAG_RW,
+ &bbr_hptsi_segments_floor, 1,
+ "Minimum TSO size we will fall too in segments");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "utter_max", CTLFLAG_RW,
+ &bbr_hptsi_utter_max, 0,
+ "The absolute maximum that any pacing (outside of hardware) can be");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "seg_divisor", CTLFLAG_RW,
+ &bbr_hptsi_per_second, 100,
+ "What is the divisor in our hptsi TSO calculation 512Mbps < X > 24Mbps ");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "srtt_mul", CTLFLAG_RW,
+ &bbr_hptsi_max_mul, 1,
+ "The multiplier for pace len max");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_hptsi),
+ OID_AUTO, "srtt_div", CTLFLAG_RW,
+ &bbr_hptsi_max_div, 2,
+ "The divisor for pace len max");
+ /* Measurement controls */
+ bbr_measure = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "measure",
+ CTLFLAG_RW, 0,
+ "Measurement controls");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "min_i_bw", CTLFLAG_RW,
+ &bbr_initial_bw_bps, 62500,
+ "Minimum initial b/w in bytes per second");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "no_sack_needed", CTLFLAG_RW,
+ &bbr_sack_not_required, 0,
+ "Do we allow bbr to run on connections not supporting SACK?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "use_google", CTLFLAG_RW,
+ &bbr_use_google_algo, 0,
+ "Use has close to google V1.0 has possible?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "ts_limiting", CTLFLAG_RW,
+ &bbr_ts_limiting, 1,
+ "Do we attempt to use the peers timestamp to limit b/w caculations?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "ts_can_raise", CTLFLAG_RW,
+ &bbr_ts_can_raise, 0,
+ "Can we raise the b/w via timestamp b/w calculation?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "ts_delta", CTLFLAG_RW,
+ &bbr_min_usec_delta, 20000,
+ "How long in usec between ts of our sends in ts validation code?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "ts_peer_delta", CTLFLAG_RW,
+ &bbr_min_peer_delta, 20,
+ "What min numerical value should be between the peer deltas?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "ts_delta_percent", CTLFLAG_RW,
+ &bbr_delta_percent, 150,
+ "What percentage (150 = 15.0) do we allow variance for?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "min_measure_good_bw", CTLFLAG_RW,
+ &bbr_min_measurements_req, 1,
+ "What is the minimum measurment count we need before we switch to our b/w estimate");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "min_measure_before_pace", CTLFLAG_RW,
+ &bbr_no_pacing_until, 4,
+ "How many pkt-epoch's (0 is off) do we need before pacing is on?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "quanta", CTLFLAG_RW,
+ &bbr_quanta, 2,
+ "Extra quanta to add when calculating the target (ID section 4.2.3.2).");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_measure),
+ OID_AUTO, "noretran", CTLFLAG_RW,
+ &bbr_no_retran, 0,
+ "Should google mode not use retransmission measurements for the b/w estimation?");
+ /* State controls */
+ bbr_states = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "states",
+ CTLFLAG_RW, 0,
+ "State controls");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "idle_restart", CTLFLAG_RW,
+ &bbr_uses_idle_restart, 0,
+ "Do we use a new special idle_restart state to ramp back up quickly?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "idle_restart_threshold", CTLFLAG_RW,
+ &bbr_idle_restart_threshold, 100000,
+ "How long must we be idle before we restart??");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "use_pkt_epoch", CTLFLAG_RW,
+ &bbr_state_is_pkt_epoch, 0,
+ "Do we use a pkt-epoch for substate if 0 rttProp?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "startup_rtt_gain", CTLFLAG_RW,
+ &bbr_rtt_gain_thresh, 0,
+ "What increase in RTT triggers us to stop ignoring no-loss and possibly exit startup?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "drain_floor", CTLFLAG_RW,
+ &bbr_drain_floor, 88,
+ "What is the lowest we can drain (pg) too?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "drain_2_target", CTLFLAG_RW,
+ &bbr_state_drain_2_tar, 1,
+ "Do we drain to target in drain substate?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "gain_2_target", CTLFLAG_RW,
+ &bbr_gain_to_target, 1,
+ "Does probe bw gain to target??");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "gain_extra_time", CTLFLAG_RW,
+ &bbr_gain_gets_extra_too, 1,
+ "Does probe bw gain get the extra time too?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "ld_div", CTLFLAG_RW,
+ &bbr_drain_drop_div, 5,
+ "Long drain drop divider?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "ld_mul", CTLFLAG_RW,
+ &bbr_drain_drop_mul, 4,
+ "Long drain drop multiplier?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "rand_ot_disc", CTLFLAG_RW,
+ &bbr_rand_ot, 50,
+ "Random discount of the ot?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "dr_filter_life", CTLFLAG_RW,
+ &bbr_num_pktepo_for_del_limit, BBR_NUM_RTTS_FOR_DEL_LIMIT,
+ "How many packet-epochs does the b/w delivery rate last?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "subdrain_applimited", CTLFLAG_RW,
+ &bbr_sub_drain_app_limit, 0,
+ "Does our sub-state drain invoke app limited if its long?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "use_cwnd_subdrain", CTLFLAG_RW,
+ &bbr_sub_drain_slam_cwnd, 0,
+ "Should we set/recover cwnd for sub-state drain?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "use_cwnd_maindrain", CTLFLAG_RW,
+ &bbr_slam_cwnd_in_main_drain, 0,
+ "Should we set/recover cwnd for main-state drain?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "google_gets_earlyout", CTLFLAG_RW,
+ &google_allow_early_out, 1,
+ "Should we allow google probe-bw/drain to exit early at flight target?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_states),
+ OID_AUTO, "google_exit_loss", CTLFLAG_RW,
+ &google_consider_lost, 1,
+ "Should we have losses exit gain of probebw in google mode??");
+ /* Startup controls */
+ bbr_startup = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "startup",
+ CTLFLAG_RW, 0,
+ "Startup controls");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_startup),
+ OID_AUTO, "cheat_iwnd", CTLFLAG_RW,
+ &bbr_sends_full_iwnd, 1,
+ "Do we not pace but burst out initial windows has our TSO size?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_startup),
+ OID_AUTO, "loss_threshold", CTLFLAG_RW,
+ &bbr_startup_loss_thresh, 2000,
+ "In startup what is the loss threshold in a pe that will exit us from startup?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_startup),
+ OID_AUTO, "use_lowerpg", CTLFLAG_RW,
+ &bbr_use_lower_gain_in_startup, 1,
+ "Should we use a lower hptsi gain if we see loss in startup?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_startup),
+ OID_AUTO, "gain", CTLFLAG_RW,
+ &bbr_start_exit, 25,
+ "What gain percent do we need to see to stay in startup??");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_startup),
+ OID_AUTO, "low_gain", CTLFLAG_RW,
+ &bbr_low_start_exit, 15,
+ "What gain percent do we need to see to stay in the lower gain startup??");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_startup),
+ OID_AUTO, "loss_exit", CTLFLAG_RW,
+ &bbr_exit_startup_at_loss, 1,
+ "Should we exit startup at loss in an epoch if we are not gaining?");
+ /* CWND controls */
+ bbr_cwnd = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "cwnd",
+ CTLFLAG_RW, 0,
+ "Cwnd controls");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "tar_rtt", CTLFLAG_RW,
+ &bbr_cwndtarget_rtt_touse, 0,
+ "Target cwnd rtt measurment to use (0=rtt_prop, 1=rtt_rack, 2=pkt_rtt, 3=srtt)?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "may_shrink", CTLFLAG_RW,
+ &bbr_cwnd_may_shrink, 0,
+ "Can the cwnd shrink if it would grow to more than the target?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "max_target_limit", CTLFLAG_RW,
+ &bbr_target_cwnd_mult_limit, 8,
+ "Do we limit the cwnd to some multiple of the cwnd target if cwnd can't shrink 0=no?");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "highspeed_min", CTLFLAG_RW,
+ &bbr_cwnd_min_val_hs, BBR_HIGHSPEED_NUM_MSS,
+ "What is the high-speed min cwnd (rttProp under 1ms)");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "lowspeed_min", CTLFLAG_RW,
+ &bbr_cwnd_min_val, BBR_PROBERTT_NUM_MSS,
+ "What is the min cwnd (rttProp > 1ms)");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "initwin", CTLFLAG_RW,
+ &bbr_def_init_win, 10,
+ "What is the BBR initial window, if 0 use tcp version");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "do_loss_red", CTLFLAG_RW,
+ &bbr_do_red, 600,
+ "Do we reduce the b/w at exit from recovery based on ratio of prop/srtt (800=80.0, 0=off)?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "red_scale", CTLFLAG_RW,
+ &bbr_red_scale, 20000,
+ "What RTT do we scale with?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "red_growslow", CTLFLAG_RW,
+ &bbr_red_growth_restrict, 1,
+ "Do we restrict cwnd growth for whats in flight?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "red_div", CTLFLAG_RW,
+ &bbr_red_div, 2,
+ "If we reduce whats the divisor?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "red_mul", CTLFLAG_RW,
+ &bbr_red_mul, 1,
+ "If we reduce whats the mulitiplier?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "target_is_unit", CTLFLAG_RW,
+ &bbr_target_is_bbunit, 0,
+ "Is the state target the pacing_gain or BBR_UNIT?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_cwnd),
+ OID_AUTO, "drop_limit", CTLFLAG_RW,
+ &bbr_drop_limit, 0,
+ "Number of segments limit for drop (0=use min_cwnd w/flight)?");
+
+ /* Timeout controls */
+ bbr_timeout = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "timeout",
+ CTLFLAG_RW, 0,
+ "Time out controls");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "delack", CTLFLAG_RW,
+ &bbr_delack_time, 100000,
+ "BBR's delayed ack time");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "tlp_uses", CTLFLAG_RW,
+ &bbr_tlp_type_to_use, 3,
+ "RTT that TLP uses in its calculations, 0=rttProp, 1=Rack_rtt, 2=pkt_rtt and 3=srtt");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "persmin", CTLFLAG_RW,
+ &bbr_persist_min, 250000,
+ "What is the minimum time in microseconds between persists");
+ SYSCTL_ADD_U32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "persmax", CTLFLAG_RW,
+ &bbr_persist_max, 1000000,
+ "What is the largest delay in microseconds between persists");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "tlp_minto", CTLFLAG_RW,
+ &bbr_tlp_min, 10000,
+ "TLP Min timeout in usecs");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "tlp_dack_time", CTLFLAG_RW,
+ &bbr_delayed_ack_time, 200000,
+ "TLP delayed ack compensation value");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "minrto", CTLFLAG_RW,
+ &bbr_rto_min_ms, 30,
+ "Minimum RTO in ms");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "maxrto", CTLFLAG_RW,
+ &bbr_rto_max_sec, 4,
+ "Maxiumum RTO in seconds -- should be at least as large as min_rto");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "tlp_retry", CTLFLAG_RW,
+ &bbr_tlp_max_resend, 2,
+ "How many times does TLP retry a single segment or multiple with no ACK");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "minto", CTLFLAG_RW,
+ &bbr_min_to, 1000,
+ "Minimum rack timeout in useconds");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "pktdelay", CTLFLAG_RW,
+ &bbr_pkt_delay, 1000,
+ "Extra RACK time (in useconds) besides reordering thresh");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "incr_tmrs", CTLFLAG_RW,
+ &bbr_incr_timers, 1,
+ "Increase the RXT/TLP timer by the pacing time used?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_timeout),
+ OID_AUTO, "rxtmark_sackpassed", CTLFLAG_RW,
+ &bbr_marks_rxt_sack_passed, 0,
+ "Mark sack passed on all those not ack'd when a RXT hits?");
+ /* Policer controls */
+ bbr_policer = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO,
+ "policer",
+ CTLFLAG_RW, 0,
+ "Policer controls");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "detect_enable", CTLFLAG_RW,
+ &bbr_policer_detection_enabled, 1,
+ "Is policer detection enabled??");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "min_pes", CTLFLAG_RW,
+ &bbr_lt_intvl_min_rtts, 4,
+ "Minimum number of PE's?");
+ SYSCTL_ADD_U64(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "bwdiff", CTLFLAG_RW,
+ &bbr_lt_bw_diff, (4000/8),
+ "Minimal bw diff?");
+ SYSCTL_ADD_U64(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "bwratio", CTLFLAG_RW,
+ &bbr_lt_bw_ratio, 8,
+ "Minimal bw diff?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "from_rack_rxt", CTLFLAG_RW,
+ &bbr_policer_call_from_rack_to, 0,
+ "Do we call the policer detection code from a rack-timeout?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "false_postive", CTLFLAG_RW,
+ &bbr_lt_intvl_fp, 0,
+ "What packet epoch do we do false-postive detection at (0=no)?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "loss_thresh", CTLFLAG_RW,
+ &bbr_lt_loss_thresh, 196,
+ "Loss threshold 196 = 19.6%?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_policer),
+ OID_AUTO, "false_postive_thresh", CTLFLAG_RW,
+ &bbr_lt_fd_thresh, 100,
+ "What percentage is the false detection threshold (150=15.0)?");
+ /* All the rest */
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "cheat_rxt", CTLFLAG_RW,
+ &bbr_use_rack_resend_cheat, 0,
+ "Do we burst 1ms between sends on retransmissions (like rack)?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "error_paceout", CTLFLAG_RW,
+ &bbr_error_base_paceout, 10000,
+ "When we hit an error what is the min to pace out in usec's?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "kill_paceout", CTLFLAG_RW,
+ &bbr_max_net_error_cnt, 10,
+ "When we hit this many errors in a row, kill the session?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "data_after_close", CTLFLAG_RW,
+ &bbr_ignore_data_after_close, 1,
+ "Do we hold off sending a RST until all pending data is ack'd");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "resend_use_tso", CTLFLAG_RW,
+ &bbr_resends_use_tso, 0,
+ "Can resends use TSO?");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "sblklimit", CTLFLAG_RW,
+ &bbr_sack_block_limit, 128,
+ "When do we start ignoring small sack blocks");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "bb_verbose", CTLFLAG_RW,
+ &bbr_verbose_logging, 0,
+ "Should BBR black box logging be verbose");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "reorder_thresh", CTLFLAG_RW,
+ &bbr_reorder_thresh, 2,
+ "What factor for rack will be added when seeing reordering (shift right)");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "reorder_fade", CTLFLAG_RW,
+ &bbr_reorder_fade, 0,
+ "Does reorder detection fade, if so how many ms (0 means never)");
+ SYSCTL_ADD_S32(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW,
+ &bbr_tlp_thresh, 1,
+ "what divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)");
+ /* Stats and counters */
+ /* The pacing counters for hdwr/software can't be in the array */
+ bbr_nohdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK);
+ bbr_hdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "enob_hdwr_pacing", CTLFLAG_RD,
+ &bbr_hdwr_pacing_enobuf,
+ "Total number of enobufs for hardware paced flows");
+ SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "enob_no_hdwr_pacing", CTLFLAG_RD,
+ &bbr_nohdwr_pacing_enobuf,
+ "Total number of enobufs for non-hardware paced flows");
+
+
+ bbr_flows_whdwr_pacing = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "hdwr_pacing", CTLFLAG_RD,
+ &bbr_flows_whdwr_pacing,
+ "Total number of hardware paced flows");
+ bbr_flows_nohdwr_pacing = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "software_pacing", CTLFLAG_RD,
+ &bbr_flows_nohdwr_pacing,
+ "Total number of software paced flows");
+ COUNTER_ARRAY_ALLOC(bbr_stat_arry, BBR_STAT_SIZE, M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "stats", CTLFLAG_RD,
+ bbr_stat_arry, BBR_STAT_SIZE, "BBR Stats");
+ COUNTER_ARRAY_ALLOC(bbr_opts_arry, BBR_OPTS_SIZE, M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "opts", CTLFLAG_RD,
+ bbr_opts_arry, BBR_OPTS_SIZE, "BBR Option Stats");
+ COUNTER_ARRAY_ALLOC(bbr_state_lost, BBR_MAX_STAT, M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "lost", CTLFLAG_RD,
+ bbr_state_lost, BBR_MAX_STAT, "Stats of when losses occur");
+ COUNTER_ARRAY_ALLOC(bbr_state_resend, BBR_MAX_STAT, M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "stateresend", CTLFLAG_RD,
+ bbr_state_resend, BBR_MAX_STAT, "Stats of what states resend");
+ COUNTER_ARRAY_ALLOC(bbr_state_time, BBR_MAX_STAT, M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "statetime", CTLFLAG_RD,
+ bbr_state_time, BBR_MAX_STAT, "Stats of time spent in the states");
+ COUNTER_ARRAY_ALLOC(bbr_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "outsize", CTLFLAG_RD,
+ bbr_out_size, TCP_MSS_ACCT_SIZE, "Size of output calls");
+ SYSCTL_ADD_PROC(&bbr_sysctl_ctx,
+ SYSCTL_CHILDREN(bbr_sysctl_root),
+ OID_AUTO, "clrlost", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+ &bbr_clear_lost, 0, sysctl_bbr_clear_lost, "IU", "Clear lost counters");
+}
+
+static inline int32_t
+bbr_progress_timeout_check(struct tcp_bbr *bbr)
+{
+ if (bbr->rc_tp->t_maxunacktime && bbr->rc_tp->t_acktime &&
+ TSTMP_GT(ticks, bbr->rc_tp->t_acktime)) {
+ if ((((uint32_t)ticks - bbr->rc_tp->t_acktime)) >= bbr->rc_tp->t_maxunacktime) {
+ /*
+ * There is an assumption here that the caller will
+ * drop the connection, so we increment the
+ * statistics.
+ */
+ bbr_log_progress_event(bbr, bbr->rc_tp, ticks, PROGRESS_DROP, __LINE__);
+ BBR_STAT_INC(bbr_progress_drops);
+#ifdef NETFLIX_STATS
+ TCPSTAT_INC(tcps_progdrops);
+#endif
+ return (1);
+ }
+ }
+ return (0);
+}
+
+static void
+bbr_counter_destroy()
+{
+ COUNTER_ARRAY_FREE(bbr_stat_arry, BBR_STAT_SIZE);
+ COUNTER_ARRAY_FREE(bbr_opts_arry, BBR_OPTS_SIZE);
+ COUNTER_ARRAY_FREE(bbr_out_size, TCP_MSS_ACCT_SIZE);
+ COUNTER_ARRAY_FREE(bbr_state_lost, BBR_MAX_STAT);
+ COUNTER_ARRAY_FREE(bbr_state_time, BBR_MAX_STAT);
+ COUNTER_ARRAY_FREE(bbr_state_resend, BBR_MAX_STAT);
+ counter_u64_free(bbr_flows_whdwr_pacing);
+ counter_u64_free(bbr_flows_nohdwr_pacing);
+
+}
+
+static __inline void
+bbr_fill_in_logging_data(struct tcp_bbr *bbr, struct tcp_log_bbr *l, uint32_t cts)
+{
+ memset(l, 0, sizeof(union tcp_log_stackspecific));
+ l->cur_del_rate = bbr->r_ctl.rc_bbr_cur_del_rate;
+ l->delRate = get_filter_value(&bbr->r_ctl.rc_delrate);
+ l->rttProp = get_filter_value_small(&bbr->r_ctl.rc_rttprop);
+ l->bw_inuse = bbr_get_bw(bbr);
+ l->inflight = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ l->applimited = bbr->r_ctl.r_app_limited_until;
+ l->delivered = bbr->r_ctl.rc_delivered;
+ l->timeStamp = cts;
+ l->lost = bbr->r_ctl.rc_lost;
+ l->bbr_state = bbr->rc_bbr_state;
+ l->bbr_substate = bbr_state_val(bbr);
+ l->epoch = bbr->r_ctl.rc_rtt_epoch;
+ l->lt_epoch = bbr->r_ctl.rc_lt_epoch;
+ l->pacing_gain = bbr->r_ctl.rc_bbr_hptsi_gain;
+ l->cwnd_gain = bbr->r_ctl.rc_bbr_cwnd_gain;
+ l->inhpts = bbr->rc_inp->inp_in_hpts;
+ l->ininput = bbr->rc_inp->inp_in_input;
+ l->use_lt_bw = bbr->rc_lt_use_bw;
+ l->pkts_out = bbr->r_ctl.rc_flight_at_input;
+ l->pkt_epoch = bbr->r_ctl.rc_pkt_epoch;
+}
+
+static void
+bbr_log_type_bw_reduce(struct tcp_bbr *bbr, int reason)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = 0;
+ log.u_bbr.flex2 = 0;
+ log.u_bbr.flex5 = 0;
+ log.u_bbr.flex3 = 0;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_loss_rate;
+ log.u_bbr.flex7 = reason;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_enters_probertt;
+ log.u_bbr.flex8 = 0;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BW_RED_EV, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_rwnd_collapse(struct tcp_bbr *bbr, int seq, int mode, uint32_t count)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = seq;
+ log.u_bbr.flex2 = count;
+ log.u_bbr.flex8 = mode;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_LOWGAIN, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+
+
+static void
+bbr_log_type_just_return(struct tcp_bbr *bbr, uint32_t cts, uint32_t tlen, uint8_t hpts_calling,
+ uint8_t reason, uint32_t p_maxseg, int len)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = p_maxseg;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp;
+ log.u_bbr.flex4 = reason;
+ log.u_bbr.flex5 = bbr->rc_in_persist;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_last_delay_val;
+ log.u_bbr.flex7 = p_maxseg;
+ log.u_bbr.flex8 = bbr->rc_in_persist;
+ log.u_bbr.pkts_out = 0;
+ log.u_bbr.applimited = len;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_JUSTRET, 0,
+ tlen, &log, false, &bbr->rc_tv);
+ }
+}
+
+
+static void
+bbr_log_type_enter_rec(struct tcp_bbr *bbr, uint32_t seq)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = seq;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_recovery_start;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_ENTREC, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_msgsize_fail(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t len, uint32_t maxseg, uint32_t mtu, int32_t csum_flags, int32_t tso, uint32_t cts)
+{
+ if (tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = tso;
+ log.u_bbr.flex2 = maxseg;
+ log.u_bbr.flex3 = mtu;
+ log.u_bbr.flex4 = csum_flags;
+ TCP_LOG_EVENTP(tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_MSGSIZE, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_flowend(struct tcp_bbr *bbr)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct sockbuf *r, *s;
+ struct timeval tv;
+
+ if (bbr->rc_inp->inp_socket) {
+ r = &bbr->rc_inp->inp_socket->so_rcv;
+ s = &bbr->rc_inp->inp_socket->so_snd;
+ } else {
+ r = s = NULL;
+ }
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, tcp_get_usecs(&tv));
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ r, s,
+ TCP_LOG_FLOWEND, 0,
+ 0, &log, false, &tv);
+ }
+}
+
+static void
+bbr_log_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line,
+ uint32_t lost, uint32_t del)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = lost;
+ log.u_bbr.flex2 = del;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_bbr_lastbtlbw;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_rtt;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup;
+ log.u_bbr.flex7 = line;
+ log.u_bbr.flex8 = 0;
+ log.u_bbr.inflight = bbr->r_ctl.r_measurement_count;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_PKT_EPOCH, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_time_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, uint32_t epoch_time)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->r_ctl.rc_lost;
+ log.u_bbr.flex2 = bbr->rc_inp->inp_socket->so_snd.sb_lowat;
+ log.u_bbr.flex3 = bbr->rc_inp->inp_socket->so_snd.sb_hiwat;
+ log.u_bbr.flex7 = line;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_TIME_EPOCH, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_set_of_state_target(struct tcp_bbr *bbr, uint32_t new_tar, int line, int meth)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex2 = new_tar;
+ log.u_bbr.flex3 = line;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex5 = bbr_quanta;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_pace_min_segs;
+ log.u_bbr.flex7 = bbr->rc_last_options;
+ log.u_bbr.flex8 = meth;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_STATE_TARGET, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+
+}
+
+static void
+bbr_log_type_statechange(struct tcp_bbr *bbr, uint32_t cts, int32_t line)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int;
+ if (bbr_state_is_pkt_epoch)
+ log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PKTRTT);
+ else
+ log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PROP);
+ log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup;
+ log.u_bbr.flex7 = (bbr->r_ctl.rc_target_at_state/1000);
+ log.u_bbr.lt_epoch = bbr->r_ctl.rc_level_state_extra;
+ log.u_bbr.pkts_out = bbr->r_ctl.rc_target_at_state;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_STATE, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied,
+ uint32_t rtt, uint32_t line, uint8_t reas, uint16_t cond)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks;
+ log.u_bbr.flex3 = bbr->r_ctl.last_in_probertt;
+ log.u_bbr.flex4 = applied;
+ log.u_bbr.flex5 = rtt;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex7 = cond;
+ log.u_bbr.flex8 = reas;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_RTT_SHRINKS, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_exit_rec(struct tcp_bbr *bbr)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = bbr->r_ctl.rc_recovery_start;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_EXITREC, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_cwndupd(struct tcp_bbr *bbr, uint32_t bytes_this_ack, uint32_t chg,
+ uint32_t prev_acked, int32_t meth, uint32_t target, uint32_t th_ack, int32_t line)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = prev_acked;
+ log.u_bbr.flex3 = bytes_this_ack;
+ log.u_bbr.flex4 = chg;
+ log.u_bbr.flex5 = th_ack;
+ log.u_bbr.flex6 = target;
+ log.u_bbr.flex8 = meth;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_CWND, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_rtt_sample(struct tcp_bbr *bbr, uint32_t rtt, uint32_t tsin)
+{
+ /*
+ * Log the rtt sample we are applying to the srtt algorithm in
+ * useconds.
+ */
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = rtt;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_bbr_state_time;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_ack_hdwr_delay;
+ log.u_bbr.flex4 = bbr->rc_tp->ts_offset;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.pkts_out = tcp_tv_to_mssectick(&bbr->rc_tv);
+ log.u_bbr.flex6 = tsin;
+ log.u_bbr.flex7 = 0;
+ log.u_bbr.flex8 = bbr->rc_ack_was_delayed;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ TCP_LOG_RTT, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_pesist(struct tcp_bbr *bbr, uint32_t cts, uint32_t time_in, int32_t line, uint8_t enter_exit)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = time_in;
+ log.u_bbr.flex2 = line;
+ log.u_bbr.flex8 = enter_exit;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_PERSIST, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+static void
+bbr_log_ack_clear(struct tcp_bbr *bbr, uint32_t cts)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->rc_tp->ts_recent_age;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_went_idle_time;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_ACKCLEAR, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_ack_event(struct tcp_bbr *bbr, struct tcphdr *th, struct tcpopt *to, uint32_t tlen,
+ uint16_t nsegs, uint32_t cts, int32_t nxt_pkt, struct mbuf *m)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = nsegs;
+ log.u_bbr.flex2 = bbr->r_ctl.rc_lost_bytes;
+ if (m) {
+ struct timespec ts;
+
+ log.u_bbr.flex3 = m->m_flags;
+ if (m->m_flags & M_TSTMP) {
+ mbuf_tstmp2timespec(m, &ts);
+ tv.tv_sec = ts.tv_sec;
+ tv.tv_usec = ts.tv_nsec / 1000;
+ log.u_bbr.lt_epoch = tcp_tv_to_usectick(&tv);
+ } else {
+ log.u_bbr.lt_epoch = 0;
+ }
+ if (m->m_flags & M_TSTMP_LRO) {
+ tv.tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000;
+ tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000) / 1000;
+ log.u_bbr.flex5 = tcp_tv_to_usectick(&tv);
+ } else {
+ /* No arrival timestamp */
+ log.u_bbr.flex5 = 0;
+ }
+
+ log.u_bbr.pkts_out = tcp_get_usecs(&tv);
+ } else {
+ log.u_bbr.flex3 = 0;
+ log.u_bbr.flex5 = 0;
+ log.u_bbr.flex6 = 0;
+ log.u_bbr.pkts_out = 0;
+ }
+ log.u_bbr.flex4 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex7 = bbr->r_wanted_output;
+ log.u_bbr.flex8 = bbr->rc_in_persist;
+ TCP_LOG_EVENTP(bbr->rc_tp, th,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ TCP_LOG_IN, 0,
+ tlen, &log, true, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_doseg_done(struct tcp_bbr *bbr, uint32_t cts, int32_t nxt_pkt, int32_t did_out)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = did_out;
+ log.u_bbr.flex2 = nxt_pkt;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_last_delay_val;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_timer_exp;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_lost_bytes;
+ log.u_bbr.flex7 = bbr->r_wanted_output;
+ log.u_bbr.flex8 = bbr->rc_in_persist;
+ log.u_bbr.pkts_out = bbr->r_ctl.highest_hdwr_delay;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_DOSEG_DONE, 0,
+ 0, &log, true, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_enobuf_jmp(struct tcp_bbr *bbr, uint32_t len, uint32_t cts,
+ int32_t line, uint32_t o_len, uint32_t segcnt, uint32_t segsiz)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = o_len;
+ log.u_bbr.flex3 = segcnt;
+ log.u_bbr.flex4 = segsiz;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_ENOBUF_JMP, ENOBUFS,
+ len, &log, true, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_to_processing(struct tcp_bbr *bbr, uint32_t cts, int32_t ret, int32_t timers, uint8_t hpts_calling)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = timers;
+ log.u_bbr.flex2 = ret;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex5 = cts;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex8 = hpts_calling;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_TO_PROCESS, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_to_event(struct tcp_bbr *bbr, uint32_t cts, int32_t to_num)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ uint64_t ar;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->bbr_timer_src;
+ log.u_bbr.flex2 = 0;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags;
+ ar = (uint64_t)(bbr->r_ctl.rc_resend);
+ ar >>= 32;
+ ar &= 0x00000000ffffffff;
+ log.u_bbr.flex4 = (uint32_t)ar;
+ ar = (uint64_t)bbr->r_ctl.rc_resend;
+ ar &= 0x00000000ffffffff;
+ log.u_bbr.flex5 = (uint32_t)ar;
+ log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur);
+ log.u_bbr.flex8 = to_num;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_RTO, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_startup_event(struct tcp_bbr *bbr, uint32_t cts, uint32_t flex1, uint32_t flex2, uint32_t flex3, uint8_t reason)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = flex1;
+ log.u_bbr.flex2 = flex2;
+ log.u_bbr.flex3 = flex3;
+ log.u_bbr.flex4 = 0;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup;
+ log.u_bbr.flex8 = reason;
+ log.u_bbr.cur_del_rate = bbr->r_ctl.rc_bbr_lastbtlbw;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_REDUCE, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = diag->p_nxt_slot;
+ log.u_bbr.flex2 = diag->p_cur_slot;
+ log.u_bbr.flex3 = diag->slot_req;
+ log.u_bbr.flex4 = diag->inp_hptsslot;
+ log.u_bbr.flex5 = diag->slot_remaining;
+ log.u_bbr.flex6 = diag->need_new_to;
+ log.u_bbr.flex7 = diag->p_hpts_active;
+ log.u_bbr.flex8 = diag->p_on_min_sleep;
+ /* Hijack other fields as needed */
+ log.u_bbr.epoch = diag->have_slept;
+ log.u_bbr.lt_epoch = diag->yet_to_sleep;
+ log.u_bbr.pkts_out = diag->co_ret;
+ log.u_bbr.applimited = diag->hpts_sleep_time;
+ log.u_bbr.delivered = diag->p_prev_slot;
+ log.u_bbr.inflight = diag->p_runningtick;
+ log.u_bbr.bw_inuse = diag->wheel_tick;
+ log.u_bbr.rttProp = diag->wheel_cts;
+ log.u_bbr.delRate = diag->maxticks;
+ log.u_bbr.cur_del_rate = diag->p_curtick;
+ log.u_bbr.cur_del_rate <<= 32;
+ log.u_bbr.cur_del_rate |= diag->p_lasttick;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_HPTSDIAG, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt,
+ uint32_t thresh, uint32_t to)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->rc_tp->t_rttvar;
+ log.u_bbr.flex2 = time_since_sent;
+ log.u_bbr.flex3 = srtt;
+ log.u_bbr.flex4 = thresh;
+ log.u_bbr.flex5 = to;
+ log.u_bbr.flex6 = bbr->rc_tp->t_srtt;
+ log.u_bbr.flex8 = mode;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_TIMERPREP, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len,
+ uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = usecs;
+ log.u_bbr.flex2 = len;
+ log.u_bbr.flex3 = (uint32_t)((bw >> 32) & 0x00000000ffffffff);
+ log.u_bbr.flex4 = (uint32_t)(bw & 0x00000000ffffffff);
+ if (override)
+ log.u_bbr.flex5 = (1 << 2);
+ else
+ log.u_bbr.flex5 = 0;
+ log.u_bbr.flex6 = override;
+ log.u_bbr.flex7 = gain;
+ log.u_bbr.flex8 = mod;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_HPTSI_CALC, 0,
+ len, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+
+ log.u_bbr.flex1 = bbr->bbr_timer_src;
+ log.u_bbr.flex2 = to;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex4 = slot;
+ log.u_bbr.flex5 = bbr->rc_inp->inp_hptsslot;
+ log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur);
+ log.u_bbr.pkts_out = bbr->rc_inp->inp_flags2;
+ log.u_bbr.flex8 = which;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_TIMERSTAR, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_thresh_choice(struct tcp_bbr *bbr, uint32_t cts, uint32_t thresh, uint32_t lro, uint32_t srtt, struct bbr_sendmap *rsm, uint8_t frm)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = thresh;
+ log.u_bbr.flex2 = lro;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_reorder_ts;
+ log.u_bbr.flex4 = rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
+ log.u_bbr.flex5 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur);
+ log.u_bbr.flex6 = srtt;
+ log.u_bbr.flex7 = bbr->r_ctl.rc_reorder_shift;
+ log.u_bbr.flex8 = frm;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_THRESH_CALC, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_to_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts, uint8_t hpts_removed)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = bbr->bbr_timer_src;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex4 = bbr->rc_in_persist;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur);
+ log.u_bbr.flex8 = hpts_removed;
+ log.u_bbr.pkts_out = bbr->rc_pacer_started;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_TIMERCANC, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+
+static void
+bbr_log_tstmp_validation(struct tcp_bbr *bbr, uint64_t peer_delta, uint64_t delta)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = bbr->r_ctl.bbr_peer_tsratio;
+ log.u_bbr.flex2 = (peer_delta >> 32);
+ log.u_bbr.flex3 = (peer_delta & 0x00000000ffffffff);
+ log.u_bbr.flex4 = (delta >> 32);
+ log.u_bbr.flex5 = (delta & 0x00000000ffffffff);
+ log.u_bbr.flex7 = bbr->rc_ts_clock_set;
+ log.u_bbr.flex8 = bbr->rc_ts_cant_be_used;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_TSTMP_VAL, 0,
+ 0, &log, false, &bbr->rc_tv);
+
+ }
+}
+
+static void
+bbr_log_type_tsosize(struct tcp_bbr *bbr, uint32_t cts, uint32_t tsosz, uint32_t tls, uint32_t old_val, uint32_t maxseg, int hdwr)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = tsosz;
+ log.u_bbr.flex2 = tls;
+ log.u_bbr.flex3 = tcp_min_hptsi_time;
+ log.u_bbr.flex4 = bbr->r_ctl.bbr_hptsi_bytes_min;
+ log.u_bbr.flex5 = old_val;
+ log.u_bbr.flex6 = maxseg;
+ log.u_bbr.flex7 = bbr->rc_no_pacing;
+ log.u_bbr.flex7 <<= 1;
+ log.u_bbr.flex7 |= bbr->rc_past_init_win;
+ if (hdwr)
+ log.u_bbr.flex8 = 0x80 | bbr->rc_use_google;
+ else
+ log.u_bbr.flex8 = bbr->rc_use_google;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BBRTSO, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_rsmclear(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm,
+ uint32_t flags, uint32_t line)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = rsm->r_start;
+ log.u_bbr.flex3 = rsm->r_end;
+ log.u_bbr.flex4 = rsm->r_delivered;
+ log.u_bbr.flex5 = rsm->r_rtr_cnt;
+ log.u_bbr.flex6 = rsm->r_dupack;
+ log.u_bbr.flex7 = rsm->r_tim_lastsent[0];
+ log.u_bbr.flex8 = rsm->r_flags;
+ /* Hijack the pkts_out fids */
+ log.u_bbr.applimited = flags;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_RSM_CLEARED, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_bbrupd(struct tcp_bbr *bbr, uint8_t flex8, uint32_t cts,
+ uint32_t flex3, uint32_t flex2, uint32_t flex5,
+ uint32_t flex6, uint32_t pkts_out, int flex7,
+ uint32_t flex4, uint32_t flex1)
+{
+
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = flex1;
+ log.u_bbr.flex2 = flex2;
+ log.u_bbr.flex3 = flex3;
+ log.u_bbr.flex4 = flex4;
+ log.u_bbr.flex5 = flex5;
+ log.u_bbr.flex6 = flex6;
+ log.u_bbr.flex7 = flex7;
+ /* Hijack the pkts_out fids */
+ log.u_bbr.pkts_out = pkts_out;
+ log.u_bbr.flex8 = flex8;
+ if (bbr->rc_ack_was_delayed)
+ log.u_bbr.epoch = bbr->r_ctl.rc_ack_hdwr_delay;
+ else
+ log.u_bbr.epoch = 0;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BBRUPD, 0,
+ flex2, &log, false, &bbr->rc_tv);
+ }
+}
+
+
+static void
+bbr_log_type_ltbw(struct tcp_bbr *bbr, uint32_t cts, int32_t reason,
+ uint32_t newbw, uint32_t obw, uint32_t diff,
+ uint32_t tim)
+{
+ if (/*bbr_verbose_logging && */(bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = reason;
+ log.u_bbr.flex2 = newbw;
+ log.u_bbr.flex3 = obw;
+ log.u_bbr.flex4 = diff;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_lt_lost;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_lt_del;
+ log.u_bbr.flex7 = bbr->rc_lt_is_sampling;
+ log.u_bbr.pkts_out = tim;
+ log.u_bbr.bw_inuse = bbr->r_ctl.rc_lt_bw;
+ if (bbr->rc_lt_use_bw == 0)
+ log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch;
+ else
+ log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BWSAMP, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static inline void
+bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ log.u_bbr.flex1 = line;
+ log.u_bbr.flex2 = tick;
+ log.u_bbr.flex3 = tp->t_maxunacktime;
+ log.u_bbr.flex4 = tp->t_acktime;
+ log.u_bbr.flex8 = event;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_PROGRESS, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_type_log_hdwr_pacing(struct tcp_bbr *bbr, const struct ifnet *ifp,
+ uint64_t rate, uint64_t hw_rate, int line, uint32_t cts,
+ int error)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = ((hw_rate >> 32) & 0x00000000ffffffff);
+ log.u_bbr.flex2 = (hw_rate & 0x00000000ffffffff);
+ log.u_bbr.flex3 = (((uint64_t)ifp >> 32) & 0x00000000ffffffff);
+ log.u_bbr.flex4 = ((uint64_t)ifp & 0x00000000ffffffff);
+ log.u_bbr.bw_inuse = rate;
+ log.u_bbr.flex5 = line;
+ log.u_bbr.flex6 = error;
+ log.u_bbr.flex8 = bbr->skip_gain;
+ log.u_bbr.flex8 <<= 1;
+ log.u_bbr.flex8 |= bbr->gain_is_limited;
+ log.u_bbr.flex8 <<= 1;
+ log.u_bbr.flex8 |= bbr->bbr_hdrw_pacing;
+ log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_HDWR_PACE, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot, uint32_t del_by, uint32_t cts, uint32_t line, uint32_t prev_delay)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = slot;
+ log.u_bbr.flex2 = del_by;
+ log.u_bbr.flex3 = prev_delay;
+ log.u_bbr.flex4 = line;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_last_delay_val;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_hptsi_agg_delay;
+ log.u_bbr.flex7 = (0x0000ffff & bbr->r_ctl.rc_hpts_flags);
+ log.u_bbr.flex8 = bbr->rc_in_persist;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BBRSND, 0,
+ len, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_type_bbrrttprop(struct tcp_bbr *bbr, uint32_t t, uint32_t end, uint32_t tsconv, uint32_t cts, int32_t match, uint32_t seq, uint8_t flags)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->r_ctl.rc_delivered;
+ log.u_bbr.flex2 = 0;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_lowest_rtt;
+ log.u_bbr.flex4 = end;
+ log.u_bbr.flex5 = seq;
+ log.u_bbr.flex6 = t;
+ log.u_bbr.flex7 = match;
+ log.u_bbr.flex8 = flags;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BBRRTT, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_exit_gain(struct tcp_bbr *bbr, uint32_t cts, int32_t entry_method)
+{
+ if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state;
+ log.u_bbr.flex2 = (bbr->rc_tp->t_maxseg - bbr->rc_last_options);
+ log.u_bbr.flex3 = bbr->r_ctl.gain_epoch;
+ log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex5 = bbr->r_ctl.rc_pace_min_segs;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_state_atflight;
+ log.u_bbr.flex7 = 0;
+ log.u_bbr.flex8 = entry_method;
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_EXIT_GAIN, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+static void
+bbr_log_settings_change(struct tcp_bbr *bbr, int settings_desired)
+{
+ if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime);
+ /* R-HU */
+ log.u_bbr.flex1 = 0;
+ log.u_bbr.flex2 = 0;
+ log.u_bbr.flex3 = 0;
+ log.u_bbr.flex4 = 0;
+ log.u_bbr.flex7 = 0;
+ log.u_bbr.flex8 = settings_desired;
+
+ TCP_LOG_EVENTP(bbr->rc_tp, NULL,
+ &bbr->rc_inp->inp_socket->so_rcv,
+ &bbr->rc_inp->inp_socket->so_snd,
+ BBR_LOG_SETTINGS_CHG, 0,
+ 0, &log, false, &bbr->rc_tv);
+ }
+}
+
+/*
+ * Returns the bw from the our filter.
+ */
+static inline uint64_t
+bbr_get_full_bw(struct tcp_bbr *bbr)
+{
+ uint64_t bw;
+
+ bw = get_filter_value(&bbr->r_ctl.rc_delrate);
+
+ return (bw);
+}
+
+static inline void
+bbr_set_pktepoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line)
+{
+ uint64_t calclr;
+ uint32_t lost, del;
+
+ if (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_pktepoch)
+ lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lost_at_pktepoch;
+ else
+ lost = 0;
+ del = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_pkt_epoch_del;
+ if (lost == 0) {
+ calclr = 0;
+ } else if (del) {
+ calclr = lost;
+ calclr *= (uint64_t)1000;
+ calclr /= (uint64_t)del;
+ } else {
+ /* Nothing delivered? 100.0% loss */
+ calclr = 1000;
+ }
+ bbr->r_ctl.rc_pkt_epoch_loss_rate = (uint32_t)calclr;
+ if (IN_RECOVERY(bbr->rc_tp->t_flags))
+ bbr->r_ctl.recovery_lr += (uint32_t)calclr;
+ bbr->r_ctl.rc_pkt_epoch++;
+ if (bbr->rc_no_pacing &&
+ (bbr->r_ctl.rc_pkt_epoch >= bbr->no_pacing_until)) {
+ bbr->rc_no_pacing = 0;
+ tcp_bbr_tso_size_check(bbr, cts);
+ }
+ bbr->r_ctl.rc_pkt_epoch_rtt = bbr_calc_time(cts, bbr->r_ctl.rc_pkt_epoch_time);
+ bbr->r_ctl.rc_pkt_epoch_time = cts;
+ /* What was our loss rate */
+ bbr_log_pkt_epoch(bbr, cts, line, lost, del);
+ bbr->r_ctl.rc_pkt_epoch_del = bbr->r_ctl.rc_delivered;
+ bbr->r_ctl.rc_lost_at_pktepoch = bbr->r_ctl.rc_lost;
+}
+
+static inline void
+bbr_set_epoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line)
+{
+ uint32_t epoch_time;
+
+ /* Tick the RTT clock */
+ bbr->r_ctl.rc_rtt_epoch++;
+ epoch_time = cts - bbr->r_ctl.rc_rcv_epoch_start;
+ bbr_log_time_epoch(bbr, cts, line, epoch_time);
+ bbr->r_ctl.rc_rcv_epoch_start = cts;
+}
+
+
+static inline void
+bbr_isit_a_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, int32_t line, int32_t cum_acked)
+{
+ if (SEQ_GEQ(rsm->r_delivered, bbr->r_ctl.rc_pkt_epoch_del)) {
+ bbr->rc_is_pkt_epoch_now = 1;
+ }
+}
+
+/*
+ * Returns the bw from either the b/w filter
+ * or from the lt_bw (if the connection is being
+ * policed).
+ */
+static inline uint64_t
+__bbr_get_bw(struct tcp_bbr *bbr)
+{
+ uint64_t bw, min_bw;
+ uint64_t rtt;
+ int gm_measure_cnt = 1;
+
+ /*
+ * For startup we make, like google, a
+ * minimum b/w. This is generated from the
+ * IW and the rttProp. We do fall back to srtt
+ * if for some reason (initial handshake) we don't
+ * have a rttProp. We, in the worst case, fall back
+ * to the configured min_bw (rc_initial_hptsi_bw).
+ */
+ if (bbr->rc_bbr_state == BBR_STATE_STARTUP) {
+ /* Attempt first to use rttProp */
+ rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop);
+ if (rtt && (rtt < 0xffffffff)) {
+measure:
+ min_bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) *
+ ((uint64_t)1000000);
+ min_bw /= rtt;
+ if (min_bw < bbr->r_ctl.rc_initial_hptsi_bw) {
+ min_bw = bbr->r_ctl.rc_initial_hptsi_bw;
+ }
+
+ } else if (bbr->rc_tp->t_srtt != 0) {
+ /* No rttProp, use srtt? */
+ rtt = bbr_get_rtt(bbr, BBR_SRTT);
+ goto measure;
+ } else {
+ min_bw = bbr->r_ctl.rc_initial_hptsi_bw;
+ }
+ } else
+ min_bw = 0;
+
+ if ((bbr->rc_past_init_win == 0) &&
+ (bbr->r_ctl.rc_delivered > bbr_initial_cwnd(bbr, bbr->rc_tp)))
+ bbr->rc_past_init_win = 1;
+ if ((bbr->rc_use_google) && (bbr->r_ctl.r_measurement_count >= 1))
+ gm_measure_cnt = 0;
+ if (gm_measure_cnt &&
+ ((bbr->r_ctl.r_measurement_count < bbr_min_measurements_req) ||
+ (bbr->rc_past_init_win == 0))) {
+ /* For google we use our guess rate until we get 1 measurement */
+
+use_initial_window:
+ rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop);
+ if (rtt && (rtt < 0xffffffff)) {
+ /*
+ * We have an RTT measurment. Use that in
+ * combination with our initial window to calculate
+ * a b/w.
+ */
+ bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) *
+ ((uint64_t)1000000);
+ bw /= rtt;
+ if (bw < bbr->r_ctl.rc_initial_hptsi_bw) {
+ bw = bbr->r_ctl.rc_initial_hptsi_bw;
+ }
+ } else {
+ /* Drop back to the 40 and punt to a default */
+ bw = bbr->r_ctl.rc_initial_hptsi_bw;
+ }
+ if (bw < 1)
+ /* Probably should panic */
+ bw = 1;
+ if (bw > min_bw)
+ return (bw);
+ else
+ return (min_bw);
+ }
+ if (bbr->rc_lt_use_bw)
+ bw = bbr->r_ctl.rc_lt_bw;
+ else if (bbr->r_recovery_bw && (bbr->rc_use_google == 0))
+ bw = bbr->r_ctl.red_bw;
+ else
+ bw = get_filter_value(&bbr->r_ctl.rc_delrate);
+ if (bbr->rc_tp->t_peakrate_thr && (bbr->rc_use_google == 0)) {
+ /*
+ * Enforce user set rate limit, keep in mind that
+ * t_peakrate_thr is in B/s already
+ */
+ bw = uqmin((uint64_t)bbr->rc_tp->t_peakrate_thr, bw);
+ }
+ if (bw == 0) {
+ /* We should not be at 0, go to the initial window then */
+ goto use_initial_window;
+ }
+ if (bw < 1)
+ /* Probably should panic */
+ bw = 1;
+ if (bw < min_bw)
+ bw = min_bw;
+ return (bw);
+}
+
+static inline uint64_t
+bbr_get_bw(struct tcp_bbr *bbr)
+{
+ uint64_t bw;
+
+ bw = __bbr_get_bw(bbr);
+ return (bw);
+}
+
+static inline void
+bbr_reset_lt_bw_interval(struct tcp_bbr *bbr, uint32_t cts)
+{
+ bbr->r_ctl.rc_lt_epoch = bbr->r_ctl.rc_pkt_epoch;
+ bbr->r_ctl.rc_lt_time = bbr->r_ctl.rc_del_time;
+ bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered;
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+}
+
+static inline void
+bbr_reset_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts)
+{
+ bbr->rc_lt_is_sampling = 0;
+ bbr->rc_lt_use_bw = 0;
+ bbr->r_ctl.rc_lt_bw = 0;
+ bbr_reset_lt_bw_interval(bbr, cts);
+}
+
+static inline void
+bbr_lt_bw_samp_done(struct tcp_bbr *bbr, uint64_t bw, uint32_t cts, uint32_t timin)
+{
+ uint64_t diff;
+
+ /* Do we have a previous sample? */
+ if (bbr->r_ctl.rc_lt_bw) {
+ /* Get the diff in bytes per second */
+ if (bbr->r_ctl.rc_lt_bw > bw)
+ diff = bbr->r_ctl.rc_lt_bw - bw;
+ else
+ diff = bw - bbr->r_ctl.rc_lt_bw;
+ if ((diff <= bbr_lt_bw_diff) ||
+ (diff <= (bbr->r_ctl.rc_lt_bw / bbr_lt_bw_ratio))) {
+ /* Consider us policed */
+ uint32_t saved_bw;
+
+ saved_bw = (uint32_t)bbr->r_ctl.rc_lt_bw;
+ bbr->r_ctl.rc_lt_bw = (bw + bbr->r_ctl.rc_lt_bw) / 2; /* average of two */
+ bbr->rc_lt_use_bw = 1;
+ bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT;
+ /*
+ * Use pkt based epoch for measuring length of
+ * policer up
+ */
+ bbr->r_ctl.rc_lt_epoch_use = bbr->r_ctl.rc_pkt_epoch;
+ /*
+ * reason 4 is we need to start consider being
+ * policed
+ */
+ bbr_log_type_ltbw(bbr, cts, 4, (uint32_t)bw, saved_bw, (uint32_t)diff, timin);
+ return;
+ }
+ }
+ bbr->r_ctl.rc_lt_bw = bw;
+ bbr_reset_lt_bw_interval(bbr, cts);
+ bbr_log_type_ltbw(bbr, cts, 5, 0, (uint32_t)bw, 0, timin);
+}
+
+/*
+ * RRS: Copied from user space!
+ * Calculate a uniformly distributed random number less than upper_bound
+ * avoiding "modulo bias".
+ *
+ * Uniformity is achieved by generating new random numbers until the one
+ * returned is outside the range [0, 2**32 % upper_bound). This
+ * guarantees the selected random number will be inside
+ * [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound)
+ * after reduction modulo upper_bound.
+ */
+static uint32_t
+arc4random_uniform(uint32_t upper_bound)
+{
+ uint32_t r, min;
+
+ if (upper_bound < 2)
+ return 0;
+
+ /* 2**32 % x == (2**32 - x) % x */
+ min = -upper_bound % upper_bound;
+
+ /*
+ * This could theoretically loop forever but each retry has
+ * p > 0.5 (worst case, usually far better) of selecting a
+ * number inside the range we need, so it should rarely need
+ * to re-roll.
+ */
+ for (;;) {
+ r = arc4random();
+ if (r >= min)
+ break;
+ }
+
+ return r % upper_bound;
+}
+
+static void
+bbr_randomize_extra_state_time(struct tcp_bbr *bbr)
+{
+ uint32_t ran, deduct;
+
+ ran = arc4random_uniform(bbr_rand_ot);
+ if (ran) {
+ deduct = bbr->r_ctl.rc_level_state_extra / ran;
+ bbr->r_ctl.rc_level_state_extra -= deduct;
+ }
+}
+/*
+ * Return randomly the starting state
+ * to use in probebw.
+ */
+static uint8_t
+bbr_pick_probebw_substate(struct tcp_bbr *bbr, uint32_t cts)
+{
+ uint32_t ran;
+ uint8_t ret_val;
+
+ /* Initialize the offset to 0 */
+ bbr->r_ctl.rc_exta_time_gd = 0;
+ bbr->rc_hit_state_1 = 0;
+ bbr->r_ctl.rc_level_state_extra = 0;
+ ran = arc4random_uniform((BBR_SUBSTATE_COUNT-1));
+ /*
+ * The math works funny here :) the return value is used to set the
+ * substate and then the state change is called which increments by
+ * one. So if we return 1 (DRAIN) we will increment to 2 (LEVEL1) when
+ * we fully enter the state. Note that the (8 - 1 - ran) assures that
+ * we return 1 - 7, so we dont return 0 and end up starting in
+ * state 1 (DRAIN).
+ */
+ ret_val = BBR_SUBSTATE_COUNT - 1 - ran;
+ /* Set an epoch */
+ if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP))
+ bbr_set_epoch(bbr, cts, __LINE__);
+
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ return (ret_val);
+}
+
+static void
+bbr_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts, int32_t loss_detected)
+{
+ uint32_t diff, d_time;
+ uint64_t del_time, bw, lost, delivered;
+
+ if (bbr->r_use_policer == 0)
+ return;
+ if (bbr->rc_lt_use_bw) {
+ /* We are using lt bw do we stop yet? */
+ diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use;
+ if (diff > bbr_lt_bw_max_rtts) {
+ /* Reset it all */
+reset_all:
+ bbr_reset_lt_bw_sampling(bbr, cts);
+ if (bbr->rc_filled_pipe) {
+ bbr_set_epoch(bbr, cts, __LINE__);
+ bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts);
+ bbr_substate_change(bbr, cts, __LINE__, 0);
+ bbr->rc_bbr_state = BBR_STATE_PROBE_BW;
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ } else {
+ /*
+ * This should not happen really
+ * unless we remove the startup/drain
+ * restrictions above.
+ */
+ bbr->rc_bbr_state = BBR_STATE_STARTUP;
+ bbr_set_epoch(bbr, cts, __LINE__);
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg;
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg;
+ bbr_set_state_target(bbr, __LINE__);
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ }
+ /* reason 0 is to stop using lt-bw */
+ bbr_log_type_ltbw(bbr, cts, 0, 0, 0, 0, 0);
+ return;
+ }
+ if (bbr_lt_intvl_fp == 0) {
+ /* Not doing false-postive detection */
+ return;
+ }
+ /* False positive detection */
+ if (diff == bbr_lt_intvl_fp) {
+ /* At bbr_lt_intvl_fp we record the lost */
+ bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered;
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+ } else if (diff > (bbr_lt_intvl_min_rtts + bbr_lt_intvl_fp)) {
+ /* Now is our loss rate still high? */
+ lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost;
+ delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del;
+ if ((delivered == 0) ||
+ (((lost * 1000)/delivered) < bbr_lt_fd_thresh)) {
+ /* No still below our threshold */
+ bbr_log_type_ltbw(bbr, cts, 7, lost, delivered, 0, 0);
+ } else {
+ /* Yikes its still high, it must be a false positive */
+ bbr_log_type_ltbw(bbr, cts, 8, lost, delivered, 0, 0);
+ goto reset_all;
+ }
+ }
+ return;
+ }
+ /*
+ * Wait for the first loss before sampling, to let the policer
+ * exhaust its tokens and estimate the steady-state rate allowed by
+ * the policer. Starting samples earlier includes bursts that
+ * over-estimate the bw.
+ */
+ if (bbr->rc_lt_is_sampling == 0) {
+ /* reason 1 is to begin doing the sampling */
+ if (loss_detected == 0)
+ return;
+ bbr_reset_lt_bw_interval(bbr, cts);
+ bbr->rc_lt_is_sampling = 1;
+ bbr_log_type_ltbw(bbr, cts, 1, 0, 0, 0, 0);
+ return;
+ }
+ /* Now how long were we delivering long term last> */
+ if (TSTMP_GEQ(bbr->r_ctl.rc_del_time, bbr->r_ctl.rc_lt_time))
+ d_time = bbr->r_ctl.rc_del_time - bbr->r_ctl.rc_lt_time;
+ else
+ d_time = 0;
+
+ /* To avoid underestimates, reset sampling if we run out of data. */
+ if (bbr->r_ctl.r_app_limited_until) {
+ /* Can not measure in app-limited state */
+ bbr_reset_lt_bw_sampling(bbr, cts);
+ /* reason 2 is to reset sampling due to app limits */
+ bbr_log_type_ltbw(bbr, cts, 2, 0, 0, 0, d_time);
+ return;
+ }
+ diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch;
+ if (diff < bbr_lt_intvl_min_rtts) {
+ /*
+ * need more samples (we don't
+ * start on a round like linux so
+ * we need 1 more).
+ */
+ /* 6 is not_enough time or no-loss */
+ bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time);
+ return;
+ }
+ if (diff > (4 * bbr_lt_intvl_min_rtts)) {
+ /*
+ * For now if we wait too long, reset all sampling. We need
+ * to do some research here, its possible that we should
+ * base this on how much loss as occurred.. something like
+ * if its under 10% (or some thresh) reset all otherwise
+ * don't. Thats for phase II I guess.
+ */
+ bbr_reset_lt_bw_sampling(bbr, cts);
+ /* reason 3 is to reset sampling due too long of sampling */
+ bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time);
+ return;
+ }
+ /*
+ * End sampling interval when a packet is lost, so we estimate the
+ * policer tokens were exhausted. Stopping the sampling before the
+ * tokens are exhausted under-estimates the policed rate.
+ */
+ if (loss_detected == 0) {
+ /* 6 is not_enough time or no-loss */
+ bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time);
+ return;
+ }
+ /* Calculate packets lost and delivered in sampling interval. */
+ lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost;
+ delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del;
+ if ((delivered == 0) ||
+ (((lost * 1000)/delivered) < bbr_lt_loss_thresh)) {
+ bbr_log_type_ltbw(bbr, cts, 6, lost, delivered, 0, d_time);
+ return;
+ }
+ if (d_time < 1000) {
+ /* Not enough time. wait */
+ /* 6 is not_enough time or no-loss */
+ bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time);
+ return;
+ }
+ if (d_time >= (0xffffffff / USECS_IN_MSEC)) {
+ /* Too long */
+ bbr_reset_lt_bw_sampling(bbr, cts);
+ /* reason 3 is to reset sampling due too long of sampling */
+ bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time);
+ return;
+ }
+ del_time = d_time;
+ bw = delivered;
+ bw *= (uint64_t)USECS_IN_SECOND;
+ bw /= del_time;
+ bbr_lt_bw_samp_done(bbr, bw, cts, d_time);
+}
+
+/*
+ * Allocate a sendmap from our zone.
+ */
+static struct bbr_sendmap *
+bbr_alloc(struct tcp_bbr *bbr)
+{
+ struct bbr_sendmap *rsm;
+
+ BBR_STAT_INC(bbr_to_alloc);
+ rsm = uma_zalloc(bbr_zone, (M_NOWAIT | M_ZERO));
+ if (rsm) {
+ bbr->r_ctl.rc_num_maps_alloced++;
+ return (rsm);
+ }
+ if (bbr->r_ctl.rc_free_cnt) {
+ BBR_STAT_INC(bbr_to_alloc_emerg);
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free);
+ TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next);
+ bbr->r_ctl.rc_free_cnt--;
+ return (rsm);
+ }
+ BBR_STAT_INC(bbr_to_alloc_failed);
+ return (NULL);
+}
+
+static struct bbr_sendmap *
+bbr_alloc_full_limit(struct tcp_bbr *bbr)
+{
+ if ((bbr_tcp_map_entries_limit > 0) &&
+ (bbr->r_ctl.rc_num_maps_alloced >= bbr_tcp_map_entries_limit)) {
+ BBR_STAT_INC(bbr_alloc_limited);
+ if (!bbr->alloc_limit_reported) {
+ bbr->alloc_limit_reported = 1;
+ BBR_STAT_INC(bbr_alloc_limited_conns);
+ }
+ return (NULL);
+ }
+ return (bbr_alloc(bbr));
+}
+
+
+/* wrapper to allocate a sendmap entry, subject to a specific limit */
+static struct bbr_sendmap *
+bbr_alloc_limit(struct tcp_bbr *bbr, uint8_t limit_type)
+{
+ struct bbr_sendmap *rsm;
+
+ if (limit_type) {
+ /* currently there is only one limit type */
+ if (bbr_tcp_map_split_limit > 0 &&
+ bbr->r_ctl.rc_num_split_allocs >= bbr_tcp_map_split_limit) {
+ BBR_STAT_INC(bbr_split_limited);
+ if (!bbr->alloc_limit_reported) {
+ bbr->alloc_limit_reported = 1;
+ BBR_STAT_INC(bbr_alloc_limited_conns);
+ }
+ return (NULL);
+ }
+ }
+
+ /* allocate and mark in the limit type, if set */
+ rsm = bbr_alloc(bbr);
+ if (rsm != NULL && limit_type) {
+ rsm->r_limit_type = limit_type;
+ bbr->r_ctl.rc_num_split_allocs++;
+ }
+ return (rsm);
+}
+
+static void
+bbr_free(struct tcp_bbr *bbr, struct bbr_sendmap *rsm)
+{
+ if (rsm->r_limit_type) {
+ /* currently there is only one limit type */
+ bbr->r_ctl.rc_num_split_allocs--;
+ }
+ if (rsm->r_is_smallmap)
+ bbr->r_ctl.rc_num_small_maps_alloced--;
+ if (bbr->r_ctl.rc_tlp_send == rsm)
+ bbr->r_ctl.rc_tlp_send = NULL;
+ if (bbr->r_ctl.rc_resend == rsm) {
+ bbr->r_ctl.rc_resend = NULL;
+ }
+ if (bbr->r_ctl.rc_next == rsm)
+ bbr->r_ctl.rc_next = NULL;
+ if (bbr->r_ctl.rc_sacklast == rsm)
+ bbr->r_ctl.rc_sacklast = NULL;
+ if (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) {
+ memset(rsm, 0, sizeof(struct bbr_sendmap));
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next);
+ rsm->r_limit_type = 0;
+ bbr->r_ctl.rc_free_cnt++;
+ return;
+ }
+ bbr->r_ctl.rc_num_maps_alloced--;
+ uma_zfree(bbr_zone, rsm);
+}
+
+/*
+ * Returns the BDP.
+ */
+static uint64_t
+bbr_get_bw_delay_prod(uint64_t rtt, uint64_t bw) {
+ /*
+ * Calculate the bytes in flight needed given the bw (in bytes per
+ * second) and the specifyed rtt in useconds. We need to put out the
+ * returned value per RTT to match that rate. Gain will normaly
+ * raise it up from there.
+ *
+ * This should not overflow as long as the bandwidth is below 1
+ * TByte per second (bw < 10**12 = 2**40) and the rtt is smaller
+ * than 1000 seconds (rtt < 10**3 * 10**6 = 10**9 = 2**30).
+ */
+ uint64_t usec_per_sec;
+
+ usec_per_sec = USECS_IN_SECOND;
+ return ((rtt * bw) / usec_per_sec);
+}
+
+/*
+ * Return the initial cwnd.
+ */
+static uint32_t
+bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp)
+{
+ uint32_t i_cwnd;
+
+ if (bbr->rc_init_win) {
+ i_cwnd = bbr->rc_init_win * tp->t_maxseg;
+ } else if (V_tcp_initcwnd_segments)
+ i_cwnd = min((V_tcp_initcwnd_segments * tp->t_maxseg),
+ max(2 * tp->t_maxseg, 14600));
+ else if (V_tcp_do_rfc3390)
+ i_cwnd = min(4 * tp->t_maxseg,
+ max(2 * tp->t_maxseg, 4380));
+ else {
+ /* Per RFC5681 Section 3.1 */
+ if (tp->t_maxseg > 2190)
+ i_cwnd = 2 * tp->t_maxseg;
+ else if (tp->t_maxseg > 1095)
+ i_cwnd = 3 * tp->t_maxseg;
+ else
+ i_cwnd = 4 * tp->t_maxseg;
+ }
+ return (i_cwnd);
+}
+
+/*
+ * Given a specified gain, return the target
+ * cwnd based on that gain.
+ */
+static uint32_t
+bbr_get_raw_target_cwnd(struct tcp_bbr *bbr, uint32_t gain, uint64_t bw)
+{
+ uint64_t bdp, rtt;
+ uint32_t cwnd;
+
+ if ((get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) ||
+ (bbr_get_full_bw(bbr) == 0)) {
+ /* No measurements yet */
+ return (bbr_initial_cwnd(bbr, bbr->rc_tp));
+ }
+ /*
+ * Get bytes per RTT needed (rttProp is normally in
+ * bbr_cwndtarget_rtt_touse)
+ */
+ rtt = bbr_get_rtt(bbr, bbr_cwndtarget_rtt_touse);
+ /* Get the bdp from the two values */
+ bdp = bbr_get_bw_delay_prod(rtt, bw);
+ /* Now apply the gain */
+ cwnd = (uint32_t)(((bdp * ((uint64_t)gain)) + (uint64_t)(BBR_UNIT - 1)) / ((uint64_t)BBR_UNIT));
+
+ return (cwnd);
+}
+
+static uint32_t
+bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain)
+{
+ uint32_t cwnd, mss;
+
+ mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs);
+ /* Get the base cwnd with gain rounded to a mss */
+ cwnd = roundup(bbr_get_raw_target_cwnd(bbr, bw, gain), mss);
+ /*
+ * Add in N (2 default since we do not have a
+ * fq layer to trap packets in) quanta's per the I-D
+ * section 4.2.3.2 quanta adjust.
+ */
+ cwnd += (bbr_quanta * bbr->r_ctl.rc_pace_max_segs);
+ if (bbr->rc_use_google) {
+ if((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) &&
+ (bbr_state_val(bbr) == BBR_SUB_GAIN)) {
+ /*
+ * The linux implementation adds
+ * an extra 2 x mss in gain cycle which
+ * is documented no-where except in the code.
+ * so we add more for Neal undocumented feature
+ */
+ cwnd += 2 * mss;
+ }
+ if ((cwnd / mss) & 0x1) {
+ /* Round up for odd num mss */
+ cwnd += mss;
+ }
+ }
+ /* Are we below the min cwnd? */
+ if (cwnd < get_min_cwnd(bbr))
+ return (get_min_cwnd(bbr));
+ return (cwnd);
+}
+
+static uint16_t
+bbr_gain_adjust(struct tcp_bbr *bbr, uint16_t gain)
+{
+ if (gain < 1)
+ gain = 1;
+ return (gain);
+}
+
+static uint32_t
+bbr_get_header_oh(struct tcp_bbr *bbr)
+{
+ int seg_oh;
+
+ seg_oh = 0;
+ if (bbr->r_ctl.rc_inc_tcp_oh) {
+ /* Do we include TCP overhead? */
+ seg_oh = (bbr->rc_last_options + sizeof(struct tcphdr));
+ }
+ if (bbr->r_ctl.rc_inc_ip_oh) {
+ /* Do we include IP overhead? */
+#ifdef INET6
+ if (bbr->r_is_v6)
+ seg_oh += sizeof(struct ip6_hdr);
+ else
+#endif
+#ifdef INET
+ seg_oh += sizeof(struct ip);
+#endif
+ }
+ if (bbr->r_ctl.rc_inc_enet_oh) {
+ /* Do we include the ethernet overhead? */
+ seg_oh += sizeof(struct ether_header);
+ }
+ return(seg_oh);
+}
+
+
+static uint32_t
+bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, uint32_t useconds_time, uint64_t bw)
+{
+ uint64_t divor, res, tim;
+
+ if (useconds_time == 0)
+ return (0);
+ gain = bbr_gain_adjust(bbr, gain);
+ divor = (uint64_t)USECS_IN_SECOND * (uint64_t)BBR_UNIT;
+ tim = useconds_time;
+ res = (tim * bw * gain) / divor;
+ if (res == 0)
+ res = 1;
+ return ((uint32_t)res);
+}
+
+/*
+ * Given a gain and a length return the delay in useconds that
+ * should be used to evenly space out packets
+ * on the connection (based on the gain factor).
+ */
+static uint32_t
+bbr_get_pacing_delay(struct tcp_bbr *bbr, uint16_t gain, int32_t len, uint32_t cts, int nolog)
+{
+ uint64_t bw, lentim, res;
+ uint32_t usecs, srtt, over = 0;
+ uint32_t seg_oh, num_segs, maxseg;
+
+ if (len == 0)
+ return (0);
+
+ maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options;
+ num_segs = (len + maxseg - 1) / maxseg;
+ if (bbr->rc_use_google == 0) {
+ seg_oh = bbr_get_header_oh(bbr);
+ len += (num_segs * seg_oh);
+ }
+ gain = bbr_gain_adjust(bbr, gain);
+ bw = bbr_get_bw(bbr);
+ if (bbr->rc_use_google) {
+ uint64_t cbw;
+
+ /*
+ * Reduce the b/w by the google discount
+ * factor 10 = 1%.
+ */
+ cbw = bw * (uint64_t)(1000 - bbr->r_ctl.bbr_google_discount);
+ cbw /= (uint64_t)1000;
+ /* We don't apply a discount if it results in 0 */
+ if (cbw > 0)
+ bw = cbw;
+ }
+ lentim = ((uint64_t)len *
+ (uint64_t)USECS_IN_SECOND *
+ (uint64_t)BBR_UNIT);
+ res = lentim / ((uint64_t)gain * bw);
+ if (res == 0)
+ res = 1;
+ usecs = (uint32_t)res;
+ srtt = bbr_get_rtt(bbr, BBR_SRTT);
+ if (bbr_hptsi_max_mul && bbr_hptsi_max_div &&
+ (bbr->rc_use_google == 0) &&
+ (usecs > ((srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div))) {
+ /*
+ * We cannot let the delay be more than 1/2 the srtt time.
+ * Otherwise we cannot pace out or send properly.
+ */
+ over = usecs = (srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div;
+ BBR_STAT_INC(bbr_hpts_min_time);
+ }
+ if (!nolog)
+ bbr_log_pacing_delay_calc(bbr, gain, len, cts, usecs, bw, over, 1);
+ return (usecs);
+}
+
+static void
+bbr_ack_received(struct tcpcb *tp, struct tcp_bbr *bbr, struct tcphdr *th, uint32_t bytes_this_ack,
+ uint32_t sack_changed, uint32_t prev_acked, int32_t line, uint32_t losses)
+{
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ uint64_t bw;
+ uint32_t cwnd, target_cwnd, saved_bytes, maxseg;
+ int32_t meth;
+
+#ifdef NETFLIX_STATS
+ if ((tp->t_flags & TF_GPUTINPROG) &&
+ SEQ_GEQ(th->th_ack, tp->gput_ack)) {
+ /*
+ * Strech acks and compressed acks will cause this to
+ * oscillate but we are doing it the same way as the main
+ * stack so it will be compariable (though possibly not
+ * ideal).
+ */
+ int32_t cgput;
+ int64_t gput, time_stamp;
+
+ gput = (int64_t) (th->th_ack - tp->gput_seq) * 8;
+ time_stamp = max(1, ((bbr->r_ctl.rc_rcvtime - tp->gput_ts) / 1000));
+ cgput = gput / time_stamp;
+ stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT,
+ cgput);
+ if (tp->t_stats_gput_prev > 0)
+ stats_voi_update_abs_s32(tp->t_stats,
+ VOI_TCP_GPUT_ND,
+ ((gput - tp->t_stats_gput_prev) * 100) /
+ tp->t_stats_gput_prev);
+ tp->t_flags &= ~TF_GPUTINPROG;
+ tp->t_stats_gput_prev = cgput;
+ }
+#endif
+ if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) &&
+ ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) {
+ /* We don't change anything in probe-rtt */
+ return;
+ }
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ saved_bytes = bytes_this_ack;
+ bytes_this_ack += sack_changed;
+ if (bytes_this_ack > prev_acked) {
+ bytes_this_ack -= prev_acked;
+ /*
+ * A byte ack'd gives us a full mss
+ * to be like linux i.e. they count packets.
+ */
+ if ((bytes_this_ack < maxseg) && bbr->rc_use_google)
+ bytes_this_ack = maxseg;
+ } else {
+ /* Unlikely */
+ bytes_this_ack = 0;
+ }
+ cwnd = tp->snd_cwnd;
+ bw = get_filter_value(&bbr->r_ctl.rc_delrate);
+ if (bw)
+ target_cwnd = bbr_get_target_cwnd(bbr,
+ bw,
+ (uint32_t)bbr->r_ctl.rc_bbr_cwnd_gain);
+ else
+ target_cwnd = bbr_initial_cwnd(bbr, bbr->rc_tp);
+ if (IN_RECOVERY(tp->t_flags) &&
+ (bbr->bbr_prev_in_rec == 0)) {
+ /*
+ * We are entering recovery and
+ * thus packet conservation.
+ */
+ bbr->pkt_conservation = 1;
+ bbr->r_ctl.rc_recovery_start = bbr->r_ctl.rc_rcvtime;
+ cwnd = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) +
+ bytes_this_ack;
+ }
+ if (IN_RECOVERY(tp->t_flags)) {
+ uint32_t flight;
+
+ bbr->bbr_prev_in_rec = 1;
+ if (cwnd > losses) {
+ cwnd -= losses;
+ if (cwnd < maxseg)
+ cwnd = maxseg;
+ } else
+ cwnd = maxseg;
+ flight = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ bbr_log_type_cwndupd(bbr, flight, 0,
+ losses, 10, 0, 0, line);
+ if (bbr->pkt_conservation) {
+ uint32_t time_in;
+
+ if (TSTMP_GEQ(bbr->r_ctl.rc_rcvtime, bbr->r_ctl.rc_recovery_start))
+ time_in = bbr->r_ctl.rc_rcvtime - bbr->r_ctl.rc_recovery_start;
+ else
+ time_in = 0;
+
+ if (time_in >= bbr_get_rtt(bbr, BBR_RTT_PROP)) {
+ /* Clear packet conservation after an rttProp */
+ bbr->pkt_conservation = 0;
+ } else {
+ if ((flight + bytes_this_ack) > cwnd)
+ cwnd = flight + bytes_this_ack;
+ if (cwnd < get_min_cwnd(bbr))
+ cwnd = get_min_cwnd(bbr);
+ tp->snd_cwnd = cwnd;
+ bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed,
+ prev_acked, 1, target_cwnd, th->th_ack, line);
+ return;
+ }
+ }
+ } else
+ bbr->bbr_prev_in_rec = 0;
+ if ((bbr->rc_use_google == 0) && bbr->r_ctl.restrict_growth) {
+ bbr->r_ctl.restrict_growth--;
+ if (bytes_this_ack > maxseg)
+ bytes_this_ack = maxseg;
+ }
+ if (bbr->rc_filled_pipe) {
+ /*
+ * Here we have exited startup and filled the pipe. We will
+ * thus allow the cwnd to shrink to the target. We hit here
+ * mostly.
+ */
+ uint32_t s_cwnd;
+
+ meth = 2;
+ s_cwnd = min((cwnd + bytes_this_ack), target_cwnd);
+ if (s_cwnd > cwnd)
+ cwnd = s_cwnd;
+ else if (bbr_cwnd_may_shrink || bbr->rc_use_google || bbr->rc_no_pacing)
+ cwnd = s_cwnd;
+ } else {
+ /*
+ * Here we are still in startup, we increase cwnd by what
+ * has been acked.
+ */
+ if ((cwnd < target_cwnd) ||
+ (bbr->rc_past_init_win == 0)) {
+ meth = 3;
+ cwnd += bytes_this_ack;
+ } else {
+ /*
+ * Method 4 means we are at target so no gain in
+ * startup and past the initial window.
+ */
+ meth = 4;
+ }
+ }
+ tp->snd_cwnd = max(cwnd, get_min_cwnd(bbr));
+ bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, prev_acked, meth, target_cwnd, th->th_ack, line);
+}
+
+static void
+tcp_bbr_partialack(struct tcpcb *tp)
+{
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <=
+ tp->snd_cwnd) {
+ bbr->r_wanted_output = 1;
+ }
+}
+
+static void
+bbr_post_recovery(struct tcpcb *tp)
+{
+ struct tcp_bbr *bbr;
+ uint32_t flight;
+
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ /*
+ * Here we just exit recovery.
+ */
+ EXIT_RECOVERY(tp->t_flags);
+ /* Lock in our b/w reduction for the specified number of pkt-epochs */
+ bbr->r_recovery_bw = 0;
+ tp->snd_recover = tp->snd_una;
+ tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime);
+ bbr->pkt_conservation = 0;
+ if (bbr->rc_use_google == 0) {
+ /*
+ * For non-google mode lets
+ * go ahead and make sure we clear
+ * the recovery state so if we
+ * bounce back in to recovery we
+ * will do PC.
+ */
+ bbr->bbr_prev_in_rec = 0;
+ }
+ bbr_log_type_exit_rec(bbr);
+ if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) {
+ tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent);
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 15, 0, 0, __LINE__);
+ } else {
+ /* For probe-rtt case lets fix up its saved_cwnd */
+ if (bbr->r_ctl.rc_saved_cwnd < bbr->r_ctl.rc_cwnd_on_ent) {
+ bbr->r_ctl.rc_saved_cwnd = bbr->r_ctl.rc_cwnd_on_ent;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 16, 0, 0, __LINE__);
+ }
+ }
+ flight = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ if ((bbr->rc_use_google == 0) &&
+ bbr_do_red) {
+ uint64_t val, lr2use;
+ uint32_t maxseg, newcwnd, acks_inflight, ratio, cwnd;
+ uint32_t *cwnd_p;
+
+ if (bbr_get_rtt(bbr, BBR_SRTT)) {
+ val = ((uint64_t)bbr_get_rtt(bbr, BBR_RTT_PROP) * (uint64_t)1000);
+ val /= bbr_get_rtt(bbr, BBR_SRTT);
+ ratio = (uint32_t)val;
+ } else
+ ratio = 1000;
+
+ bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div,
+ bbr->r_ctl.recovery_lr, 21,
+ ratio,
+ bbr->r_ctl.rc_red_cwnd_pe,
+ __LINE__);
+ if ((ratio < bbr_do_red) || (bbr_do_red == 0))
+ goto done;
+ if (((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) &&
+ bbr_prtt_slam_cwnd) ||
+ (bbr_sub_drain_slam_cwnd &&
+ (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) &&
+ bbr->rc_hit_state_1 &&
+ (bbr_state_val(bbr) == BBR_SUB_DRAIN)) ||
+ ((bbr->rc_bbr_state == BBR_STATE_DRAIN) &&
+ bbr_slam_cwnd_in_main_drain)) {
+ /*
+ * Here we must poke at the saved cwnd
+ * as well as the cwnd.
+ */
+ cwnd = bbr->r_ctl.rc_saved_cwnd;
+ cwnd_p = &bbr->r_ctl.rc_saved_cwnd;
+ } else {
+ cwnd = tp->snd_cwnd;
+ cwnd_p = &tp->snd_cwnd;
+ }
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ /* Add the overall lr with the recovery lr */
+ if (bbr->r_ctl.rc_lost == 0)
+ lr2use = 0;
+ else if (bbr->r_ctl.rc_delivered == 0)
+ lr2use = 1000;
+ else {
+ lr2use = bbr->r_ctl.rc_lost * 1000;
+ lr2use /= bbr->r_ctl.rc_delivered;
+ }
+ lr2use += bbr->r_ctl.recovery_lr;
+ acks_inflight = (flight / (maxseg * 2));
+ if (bbr_red_scale) {
+ lr2use *= bbr_get_rtt(bbr, BBR_SRTT);
+ lr2use /= bbr_red_scale;
+ if ((bbr_red_growth_restrict) &&
+ ((bbr_get_rtt(bbr, BBR_SRTT)/bbr_red_scale) > 1))
+ bbr->r_ctl.restrict_growth += acks_inflight;
+ }
+ if (lr2use) {
+ val = (uint64_t)cwnd * lr2use;
+ val /= 1000;
+ if (cwnd > val)
+ newcwnd = roundup((cwnd - val), maxseg);
+ else
+ newcwnd = maxseg;
+ } else {
+ val = (uint64_t)cwnd * (uint64_t)bbr_red_mul;
+ val /= (uint64_t)bbr_red_div;
+ newcwnd = roundup((uint32_t)val, maxseg);
+ }
+ /* with standard delayed acks how many acks can I expect? */
+ if (bbr_drop_limit == 0) {
+ /*
+ * Anticpate how much we will
+ * raise the cwnd based on the acks.
+ */
+ if ((newcwnd + (acks_inflight * maxseg)) < get_min_cwnd(bbr)) {
+ /* We do enforce the min (with the acks) */
+ newcwnd = (get_min_cwnd(bbr) - acks_inflight);
+ }
+ } else {
+ /*
+ * A strict drop limit of N is is inplace
+ */
+ if (newcwnd < (bbr_drop_limit * maxseg)) {
+ newcwnd = bbr_drop_limit * maxseg;
+ }
+ }
+ /* For the next N acks do we restrict the growth */
+ *cwnd_p = newcwnd;
+ if (tp->snd_cwnd > newcwnd)
+ tp->snd_cwnd = newcwnd;
+ bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, val, 22,
+ (uint32_t)lr2use,
+ bbr_get_rtt(bbr, BBR_SRTT), __LINE__);
+ bbr->r_ctl.rc_red_cwnd_pe = bbr->r_ctl.rc_pkt_epoch;
+ }
+done:
+ bbr->r_ctl.recovery_lr = 0;
+ if (flight <= tp->snd_cwnd) {
+ bbr->r_wanted_output = 1;
+ }
+ tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime);
+}
+
+static void
+bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts)
+{
+ bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate);
+ /* Limit the drop in b/w to 1/2 our current filter. */
+ if (bbr->r_ctl.red_bw > bbr->r_ctl.rc_bbr_cur_del_rate)
+ bbr->r_ctl.red_bw = bbr->r_ctl.rc_bbr_cur_del_rate;
+ if (bbr->r_ctl.red_bw < (get_filter_value(&bbr->r_ctl.rc_delrate) / 2))
+ bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate) / 2;
+ tcp_bbr_tso_size_check(bbr, cts);
+}
+
+static void
+bbr_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type, struct bbr_sendmap *rsm)
+{
+ struct tcp_bbr *bbr;
+
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ switch (type) {
+ case CC_NDUPACK:
+ if (!IN_RECOVERY(tp->t_flags)) {
+ tp->snd_recover = tp->snd_max;
+ /* Start a new epoch */
+ bbr_set_pktepoch(bbr, bbr->r_ctl.rc_rcvtime, __LINE__);
+ if (bbr->rc_lt_is_sampling || bbr->rc_lt_use_bw) {
+ /*
+ * Move forward the lt epoch
+ * so it won't count the truncated
+ * epoch.
+ */
+ bbr->r_ctl.rc_lt_epoch++;
+ }
+ if (bbr->rc_bbr_state == BBR_STATE_STARTUP) {
+ /*
+ * Just like the policer detection code
+ * if we are in startup we must push
+ * forward the last startup epoch
+ * to hide the truncated PE.
+ */
+ bbr->r_ctl.rc_bbr_last_startup_epoch++;
+ }
+ bbr->r_ctl.rc_cwnd_on_ent = tp->snd_cwnd;
+ ENTER_RECOVERY(tp->t_flags);
+ bbr->rc_tlp_rtx_out = 0;
+ bbr->r_ctl.recovery_lr = bbr->r_ctl.rc_pkt_epoch_loss_rate;
+ tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime);
+ if (bbr->rc_inp->inp_in_hpts &&
+ ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) == 0)) {
+ /*
+ * When we enter recovery, we need to restart
+ * any timers. This may mean we gain an agg
+ * early, which will be made up for at the last
+ * rxt out.
+ */
+ bbr->rc_timer_first = 1;
+ bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime);
+ }
+ /*
+ * Calculate a new cwnd based on to the current
+ * delivery rate with no gain. We get the bdp
+ * without gaining it up like we normally would and
+ * we use the last cur_del_rate.
+ */
+ if ((bbr->rc_use_google == 0) &&
+ (bbr->r_ctl.bbr_rttprobe_gain_val ||
+ (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT))) {
+ tp->snd_cwnd = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) +
+ (tp->t_maxseg - bbr->rc_last_options);
+ if (tp->snd_cwnd < get_min_cwnd(bbr)) {
+ /* We always gate to min cwnd */
+ tp->snd_cwnd = get_min_cwnd(bbr);
+ }
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 14, 0, 0, __LINE__);
+ }
+ bbr_log_type_enter_rec(bbr, rsm->r_start);
+ }
+ break;
+ case CC_RTO_ERR:
+ TCPSTAT_INC(tcps_sndrexmitbad);
+ /* RTO was unnecessary, so reset everything. */
+ bbr_reset_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime);
+ if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) {
+ tp->snd_cwnd = tp->snd_cwnd_prev;
+ tp->snd_ssthresh = tp->snd_ssthresh_prev;
+ tp->snd_recover = tp->snd_recover_prev;
+ tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent);
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 13, 0, 0, __LINE__);
+ }
+ tp->t_badrxtwin = 0;
+ break;
+ }
+}
+
+/*
+ * Indicate whether this ack should be delayed. We can delay the ack if
+ * following conditions are met:
+ * - There is no delayed ack timer in progress.
+ * - Our last ack wasn't a 0-sized window. We never want to delay
+ * the ack that opens up a 0-sized window.
+ * - LRO wasn't used for this segment. We make sure by checking that the
+ * segment size is not larger than the MSS.
+ * - Delayed acks are enabled or this is a half-synchronized T/TCP
+ * connection.
+ * - The data being acked is less than a full segment (a stretch ack
+ * of more than a segment we should ack.
+ * - nsegs is 1 (if its more than that we received more than 1 ack).
+ */
+#define DELAY_ACK(tp, bbr, nsegs) \
+ (((tp->t_flags & TF_RXWIN0SENT) == 0) && \
+ ((bbr->bbr_segs_rcvd + nsegs) < tp->t_delayed_ack) && \
+ (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN)))
+
+/*
+ * Return the lowest RSM in the map of
+ * packets still in flight that is not acked.
+ * This should normally find on the first one
+ * since we remove packets from the send
+ * map after they are marked ACKED.
+ */
+static struct bbr_sendmap *
+bbr_find_lowest_rsm(struct tcp_bbr *bbr)
+{
+ struct bbr_sendmap *rsm;
+
+ /*
+ * Walk the time-order transmitted list looking for an rsm that is
+ * not acked. This will be the one that was sent the longest time
+ * ago that is still outstanding.
+ */
+ TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_tmap, r_tnext) {
+ if (rsm->r_flags & BBR_ACKED) {
+ continue;
+ }
+ goto finish;
+ }
+finish:
+ return (rsm);
+}
+
+static struct bbr_sendmap *
+bbr_find_high_nonack(struct tcp_bbr *bbr, struct bbr_sendmap *rsm)
+{
+ struct bbr_sendmap *prsm;
+
+ /*
+ * Walk the sequence order list backward until we hit and arrive at
+ * the highest seq not acked. In theory when this is called it
+ * should be the last segment (which it was not).
+ */
+ prsm = rsm;
+ TAILQ_FOREACH_REVERSE_FROM(prsm, &bbr->r_ctl.rc_map, bbr_head, r_next) {
+ if (prsm->r_flags & (BBR_ACKED | BBR_HAS_FIN)) {
+ continue;
+ }
+ return (prsm);
+ }
+ return (NULL);
+}
+
+/*
+ * Returns to the caller the number of microseconds that
+ * the packet can be outstanding before we think we
+ * should have had an ack returned.
+ */
+static uint32_t
+bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm)
+{
+ /*
+ * lro is the flag we use to determine if we have seen reordering.
+ * If it gets set we have seen reordering. The reorder logic either
+ * works in one of two ways:
+ *
+ * If reorder-fade is configured, then we track the last time we saw
+ * re-ordering occur. If we reach the point where enough time as
+ * passed we no longer consider reordering has occuring.
+ *
+ * Or if reorder-face is 0, then once we see reordering we consider
+ * the connection to alway be subject to reordering and just set lro
+ * to 1.
+ *
+ * In the end if lro is non-zero we add the extra time for
+ * reordering in.
+ */
+ int32_t lro;
+ uint32_t thresh, t_rxtcur;
+
+ if (srtt == 0)
+ srtt = 1;
+ if (bbr->r_ctl.rc_reorder_ts) {
+ if (bbr->r_ctl.rc_reorder_fade) {
+ if (SEQ_GEQ(cts, bbr->r_ctl.rc_reorder_ts)) {
+ lro = cts - bbr->r_ctl.rc_reorder_ts;
+ if (lro == 0) {
+ /*
+ * No time as passed since the last
+ * reorder, mark it as reordering.
+ */
+ lro = 1;
+ }
+ } else {
+ /* Negative time? */
+ lro = 0;
+ }
+ if (lro > bbr->r_ctl.rc_reorder_fade) {
+ /* Turn off reordering seen too */
+ bbr->r_ctl.rc_reorder_ts = 0;
+ lro = 0;
+ }
+ } else {
+ /* Reodering does not fade */
+ lro = 1;
+ }
+ } else {
+ lro = 0;
+ }
+ thresh = srtt + bbr->r_ctl.rc_pkt_delay;
+ if (lro) {
+ /* It must be set, if not you get 1/4 rtt */
+ if (bbr->r_ctl.rc_reorder_shift)
+ thresh += (srtt >> bbr->r_ctl.rc_reorder_shift);
+ else
+ thresh += (srtt >> 2);
+ } else {
+ thresh += 1000;
+ }
+ /* We don't let the rack timeout be above a RTO */
+ if ((bbr->rc_tp)->t_srtt == 0)
+ t_rxtcur = BBR_INITIAL_RTO;
+ else
+ t_rxtcur = TICKS_2_USEC(bbr->rc_tp->t_rxtcur);
+ if (thresh > t_rxtcur) {
+ thresh = t_rxtcur;
+ }
+ /* And we don't want it above the RTO max either */
+ if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) {
+ thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND);
+ }
+ bbr_log_thresh_choice(bbr, cts, thresh, lro, srtt, rsm, BBR_TO_FRM_RACK);
+ return (thresh);
+}
+
+/*
+ * Return to the caller the amount of time in mico-seconds
+ * that should be used for the TLP timer from the last
+ * send time of this packet.
+ */
+static uint32_t
+bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr,
+ struct bbr_sendmap *rsm, uint32_t srtt,
+ uint32_t cts)
+{
+ uint32_t thresh, len, maxseg, t_rxtcur;
+ struct bbr_sendmap *prsm;
+
+ if (srtt == 0)
+ srtt = 1;
+ if (bbr->rc_tlp_threshold)
+ thresh = srtt + (srtt / bbr->rc_tlp_threshold);
+ else
+ thresh = (srtt * 2);
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ /* Get the previous sent packet, if any */
+ len = rsm->r_end - rsm->r_start;
+
+ /* 2.1 behavior */
+ prsm = TAILQ_PREV(rsm, bbr_head, r_tnext);
+ if (prsm && (len <= maxseg)) {
+ /*
+ * Two packets outstanding, thresh should be (2*srtt) +
+ * possible inter-packet delay (if any).
+ */
+ uint32_t inter_gap = 0;
+ int idx, nidx;
+
+ idx = rsm->r_rtr_cnt - 1;
+ nidx = prsm->r_rtr_cnt - 1;
+ if (TSTMP_GEQ(rsm->r_tim_lastsent[nidx], prsm->r_tim_lastsent[idx])) {
+ /* Yes it was sent later (or at the same time) */
+ inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx];
+ }
+ thresh += inter_gap;
+ } else if (len <= maxseg) {
+ /*
+ * Possibly compensate for delayed-ack.
+ */
+ uint32_t alt_thresh;
+
+ alt_thresh = srtt + (srtt / 2) + bbr_delayed_ack_time;
+ if (alt_thresh > thresh)
+ thresh = alt_thresh;
+ }
+ /* Not above the current RTO */
+ if (tp->t_srtt == 0)
+ t_rxtcur = BBR_INITIAL_RTO;
+ else
+ t_rxtcur = TICKS_2_USEC(tp->t_rxtcur);
+
+ bbr_log_thresh_choice(bbr, cts, thresh, t_rxtcur, srtt, rsm, BBR_TO_FRM_TLP);
+ /* Not above an RTO */
+ if (thresh > t_rxtcur) {
+ thresh = t_rxtcur;
+ }
+ /* Not above a RTO max */
+ if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) {
+ thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND);
+ }
+ /* And now apply the user TLP min */
+ if (thresh < bbr_tlp_min) {
+ thresh = bbr_tlp_min;
+ }
+ return (thresh);
+}
+
+/*
+ * Return one of three RTTs to use (in microseconds).
+ */
+static __inline uint32_t
+bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type)
+{
+ uint32_t f_rtt;
+ uint32_t srtt;
+
+ f_rtt = get_filter_value_small(&bbr->r_ctl.rc_rttprop);
+ if (get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) {
+ /* We have no rtt at all */
+ if (bbr->rc_tp->t_srtt == 0)
+ f_rtt = BBR_INITIAL_RTO;
+ else
+ f_rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT);
+ /*
+ * Since we don't know how good the rtt is apply a
+ * delayed-ack min
+ */
+ if (f_rtt < bbr_delayed_ack_time) {
+ f_rtt = bbr_delayed_ack_time;
+ }
+ }
+ /* Take the filter version or last measured pkt-rtt */
+ if (rtt_type == BBR_RTT_PROP) {
+ srtt = f_rtt;
+ } else if (rtt_type == BBR_RTT_PKTRTT) {
+ if (bbr->r_ctl.rc_pkt_epoch_rtt) {
+ srtt = bbr->r_ctl.rc_pkt_epoch_rtt;
+ } else {
+ /* No pkt rtt yet */
+ srtt = f_rtt;
+ }
+ } else if (rtt_type == BBR_RTT_RACK) {
+ srtt = bbr->r_ctl.rc_last_rtt;
+ /* We need to add in any internal delay for our timer */
+ if (bbr->rc_ack_was_delayed)
+ srtt += bbr->r_ctl.rc_ack_hdwr_delay;
+ } else if (rtt_type == BBR_SRTT) {
+ srtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT);
+ } else {
+ /* TSNH */
+ srtt = f_rtt;
+#ifdef BBR_INVARIANTS
+ panic("Unknown rtt request type %d", rtt_type);
+#endif
+ }
+ return (srtt);
+}
+
+static int
+bbr_is_lost(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t cts)
+{
+ uint32_t thresh;
+
+
+ thresh = bbr_calc_thresh_rack(bbr, bbr_get_rtt(bbr, BBR_RTT_RACK),
+ cts, rsm);
+ if ((cts - rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) >= thresh) {
+ /* It is lost (past time) */
+ return (1);
+ }
+ return (0);
+}
+
+/*
+ * Return a sendmap if we need to retransmit something.
+ */
+static struct bbr_sendmap *
+bbr_check_recovery_mode(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ /*
+ * Check to see that we don't need to fall into recovery. We will
+ * need to do so if our oldest transmit is past the time we should
+ * have had an ack.
+ */
+
+ struct bbr_sendmap *rsm;
+ int32_t idx;
+
+ if (TAILQ_EMPTY(&bbr->r_ctl.rc_map)) {
+ /* Nothing outstanding that we know of */
+ return (NULL);
+ }
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap);
+ if (rsm == NULL) {
+ /* Nothing in the transmit map */
+ return (NULL);
+ }
+ if (tp->t_flags & TF_SENTFIN) {
+ /* Fin restricted, don't find anything once a fin is sent */
+ return (NULL);
+ }
+ if (rsm->r_flags & BBR_ACKED) {
+ /*
+ * Ok the first one is acked (this really should not happen
+ * since we remove the from the tmap once they are acked)
+ */
+ rsm = bbr_find_lowest_rsm(bbr);
+ if (rsm == NULL)
+ return (NULL);
+ }
+ idx = rsm->r_rtr_cnt - 1;
+ if (SEQ_LEQ(cts, rsm->r_tim_lastsent[idx])) {
+ /* Send timestamp is the same or less? can't be ready */
+ return (NULL);
+ }
+ /* Get our RTT time */
+ if (bbr_is_lost(bbr, rsm, cts) &&
+ ((rsm->r_dupack >= DUP_ACK_THRESHOLD) ||
+ (rsm->r_flags & BBR_SACK_PASSED))) {
+ if ((rsm->r_flags & BBR_MARKED_LOST) == 0) {
+ rsm->r_flags |= BBR_MARKED_LOST;
+ bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start;
+ bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start;
+ }
+ bbr_cong_signal(tp, NULL, CC_NDUPACK, rsm);
+#ifdef BBR_INVARIANTS
+ if ((rsm->r_end - rsm->r_start) == 0)
+ panic("tp:%p bbr:%p rsm:%p length is 0?", tp, bbr, rsm);
+#endif
+ return (rsm);
+ }
+ return (NULL);
+}
+
+/*
+ * RACK Timer, here we simply do logging and house keeping.
+ * the normal bbr_output_wtime() function will call the
+ * appropriate thing to check if we need to do a RACK retransmit.
+ * We return 1, saying don't proceed with bbr_output_wtime only
+ * when all timers have been stopped (destroyed PCB?).
+ */
+static int
+bbr_timeout_rack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ /*
+ * This timer simply provides an internal trigger to send out data.
+ * The check_recovery_mode call will see if there are needed
+ * retransmissions, if so we will enter fast-recovery. The output
+ * call may or may not do the same thing depending on sysctl
+ * settings.
+ */
+ uint32_t lost;
+
+ if (bbr->rc_all_timers_stopped) {
+ return (1);
+ }
+ if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) {
+ /* Its not time yet */
+ return (0);
+ }
+ BBR_STAT_INC(bbr_to_tot);
+ lost = bbr->r_ctl.rc_lost;
+ if (bbr->r_state && (bbr->r_state != tp->t_state))
+ bbr_set_state(tp, bbr, 0);
+ bbr_log_to_event(bbr, cts, BBR_TO_FRM_RACK);
+ if (bbr->r_ctl.rc_resend == NULL) {
+ /* Lets do the check here */
+ bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts);
+ }
+ if (bbr_policer_call_from_rack_to)
+ bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost));
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK;
+ return (0);
+}
+
+static __inline void
+bbr_clone_rsm(struct tcp_bbr *bbr, struct bbr_sendmap *nrsm, struct bbr_sendmap *rsm, uint32_t start)
+{
+ int idx;
+
+ nrsm->r_start = start;
+ nrsm->r_end = rsm->r_end;
+ nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
+ nrsm->r_flags = rsm->r_flags;
+ /* We don't transfer forward the SYN flag */
+ nrsm->r_flags &= ~BBR_HAS_SYN;
+ /* We move forward the FIN flag, not that this should happen */
+ rsm->r_flags &= ~BBR_HAS_FIN;
+ nrsm->r_dupack = rsm->r_dupack;
+ nrsm->r_rtr_bytes = 0;
+ nrsm->r_is_gain = rsm->r_is_gain;
+ nrsm->r_is_drain = rsm->r_is_drain;
+ nrsm->r_delivered = rsm->r_delivered;
+ nrsm->r_ts_valid = rsm->r_ts_valid;
+ nrsm->r_del_ack_ts = rsm->r_del_ack_ts;
+ nrsm->r_del_time = rsm->r_del_time;
+ nrsm->r_app_limited = rsm->r_app_limited;
+ nrsm->r_first_sent_time = rsm->r_first_sent_time;
+ nrsm->r_flight_at_send = rsm->r_flight_at_send;
+ /* We split a piece the lower section looses any just_ret flag. */
+ nrsm->r_bbr_state = rsm->r_bbr_state;
+ for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
+ nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
+ }
+ rsm->r_end = nrsm->r_start;
+ idx = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs);
+ idx /= 8;
+ /* Check if we got too small */
+ if ((rsm->r_is_smallmap == 0) &&
+ ((rsm->r_end - rsm->r_start) <= idx)) {
+ bbr->r_ctl.rc_num_small_maps_alloced++;
+ rsm->r_is_smallmap = 1;
+ }
+ /* Check the new one as well */
+ if ((nrsm->r_end - nrsm->r_start) <= idx) {
+ bbr->r_ctl.rc_num_small_maps_alloced++;
+ nrsm->r_is_smallmap = 1;
+ }
+}
+
+static int
+bbr_sack_mergable(struct bbr_sendmap *at,
+ uint32_t start, uint32_t end)
+{
+ /*
+ * Given a sack block defined by
+ * start and end, and a current postion
+ * at. Return 1 if either side of at
+ * would show that the block is mergable
+ * to that side. A block to be mergable
+ * must have overlap with the start/end
+ * and be in the SACK'd state.
+ */
+ struct bbr_sendmap *l_rsm;
+ struct bbr_sendmap *r_rsm;
+
+ /* first get the either side blocks */
+ l_rsm = TAILQ_PREV(at, bbr_head, r_next);
+ r_rsm = TAILQ_NEXT(at, r_next);
+ if (l_rsm && (l_rsm->r_flags & BBR_ACKED)) {
+ /* Potentially mergeable */
+ if ((l_rsm->r_end == start) ||
+ (SEQ_LT(start, l_rsm->r_end) &&
+ SEQ_GT(end, l_rsm->r_end))) {
+ /*
+ * map blk |------|
+ * sack blk |------|
+ * <or>
+ * map blk |------|
+ * sack blk |------|
+ */
+ return (1);
+ }
+ }
+ if (r_rsm && (r_rsm->r_flags & BBR_ACKED)) {
+ /* Potentially mergeable */
+ if ((r_rsm->r_start == end) ||
+ (SEQ_LT(start, r_rsm->r_start) &&
+ SEQ_GT(end, r_rsm->r_start))) {
+ /*
+ * map blk |---------|
+ * sack blk |----|
+ * <or>
+ * map blk |---------|
+ * sack blk |-------|
+ */
+ return (1);
+ }
+ }
+ return (0);
+}
+
+static struct bbr_sendmap *
+bbr_merge_rsm(struct tcp_bbr *bbr,
+ struct bbr_sendmap *l_rsm,
+ struct bbr_sendmap *r_rsm)
+{
+ /*
+ * We are merging two ack'd RSM's,
+ * the l_rsm is on the left (lower seq
+ * values) and the r_rsm is on the right
+ * (higher seq value). The simplest way
+ * to merge these is to move the right
+ * one into the left. I don't think there
+ * is any reason we need to try to find
+ * the oldest (or last oldest retransmitted).
+ */
+ l_rsm->r_end = r_rsm->r_end;
+ if (l_rsm->r_dupack < r_rsm->r_dupack)
+ l_rsm->r_dupack = r_rsm->r_dupack;
+ if (r_rsm->r_rtr_bytes)
+ l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes;
+ if (r_rsm->r_in_tmap) {
+ /* This really should not happen */
+ TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, r_rsm, r_tnext);
+ }
+ if (r_rsm->r_app_limited)
+ l_rsm->r_app_limited = r_rsm->r_app_limited;
+ /* Now the flags */
+ if (r_rsm->r_flags & BBR_HAS_FIN)
+ l_rsm->r_flags |= BBR_HAS_FIN;
+ if (r_rsm->r_flags & BBR_TLP)
+ l_rsm->r_flags |= BBR_TLP;
+ if (r_rsm->r_flags & BBR_RWND_COLLAPSED)
+ l_rsm->r_flags |= BBR_RWND_COLLAPSED;
+ if (r_rsm->r_flags & BBR_MARKED_LOST) {
+ /* This really should not happen */
+ bbr->r_ctl.rc_lost_bytes -= r_rsm->r_end - r_rsm->r_start;
+ }
+ TAILQ_REMOVE(&bbr->r_ctl.rc_map, r_rsm, r_next);
+ if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) {
+ /* Transfer the split limit to the map we free */
+ r_rsm->r_limit_type = l_rsm->r_limit_type;
+ l_rsm->r_limit_type = 0;
+ }
+ bbr_free(bbr, r_rsm);
+ return(l_rsm);
+}
+
+/*
+ * TLP Timer, here we simply setup what segment we want to
+ * have the TLP expire on, the normal bbr_output_wtime() will then
+ * send it out.
+ *
+ * We return 1, saying don't proceed with bbr_output_wtime only
+ * when all timers have been stopped (destroyed PCB?).
+ */
+static int
+bbr_timeout_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ /*
+ * Tail Loss Probe.
+ */
+ struct bbr_sendmap *rsm = NULL;
+ struct socket *so;
+ uint32_t amm;
+ uint32_t out, avail;
+ uint32_t maxseg;
+ int collapsed_win = 0;
+
+ if (bbr->rc_all_timers_stopped) {
+ return (1);
+ }
+ if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) {
+ /* Its not time yet */
+ return (0);
+ }
+ if (bbr_progress_timeout_check(bbr)) {
+ tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
+ return (1);
+ }
+ /* Did we somehow get into persists? */
+ if (bbr->rc_in_persist) {
+ return (0);
+ }
+ if (bbr->r_state && (bbr->r_state != tp->t_state))
+ bbr_set_state(tp, bbr, 0);
+ BBR_STAT_INC(bbr_tlp_tot);
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+#ifdef KERN_TLS
+ if (bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) {
+ /*
+ * For hardware TLS we do *not* want to send
+ * new data.
+ */
+ goto need_retran;
+ }
+#endif
+ /*
+ * A TLP timer has expired. We have been idle for 2 rtts. So we now
+ * need to figure out how to force a full MSS segment out.
+ */
+ so = tp->t_inpcb->inp_socket;
+ avail = sbavail(&so->so_snd);
+ out = ctf_outstanding(tp);
+ if (out > tp->snd_wnd) {
+ /* special case, we need a retransmission */
+ collapsed_win = 1;
+ goto need_retran;
+ }
+ if (avail > out) {
+ /* New data is available */
+ amm = avail - out;
+ if (amm > maxseg) {
+ amm = maxseg;
+ } else if ((amm < maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) {
+ /* not enough to fill a MTU and no-delay is off */
+ goto need_retran;
+ }
+ /* Set the send-new override */
+ if ((out + amm) <= tp->snd_wnd) {
+ bbr->rc_tlp_new_data = 1;
+ } else {
+ goto need_retran;
+ }
+ bbr->r_ctl.rc_tlp_seg_send_cnt = 0;
+ bbr->r_ctl.rc_last_tlp_seq = tp->snd_max;
+ bbr->r_ctl.rc_tlp_send = NULL;
+ /* cap any slots */
+ BBR_STAT_INC(bbr_tlp_newdata);
+ goto send;
+ }
+need_retran:
+ /*
+ * Ok we need to arrange the last un-acked segment to be re-sent, or
+ * optionally the first un-acked segment.
+ */
+ if (collapsed_win == 0) {
+ rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next);
+ if (rsm && (BBR_ACKED | BBR_HAS_FIN)) {
+ rsm = bbr_find_high_nonack(bbr, rsm);
+ }
+ if (rsm == NULL) {
+ goto restore;
+ }
+ } else {
+ /*
+ * We must find the last segment
+ * that was acceptable by the client.
+ */
+ TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) {
+ if ((rsm->r_flags & BBR_RWND_COLLAPSED) == 0) {
+ /* Found one */
+ break;
+ }
+ }
+ if (rsm == NULL) {
+ /* None? if so send the first */
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ if (rsm == NULL)
+ goto restore;
+ }
+ }
+ if ((rsm->r_end - rsm->r_start) > maxseg) {
+ /*
+ * We need to split this the last segment in two.
+ */
+ struct bbr_sendmap *nrsm;
+
+ nrsm = bbr_alloc_full_limit(bbr);
+ if (nrsm == NULL) {
+ /*
+ * We can't get memory to split, we can either just
+ * not split it. Or retransmit the whole piece, lets
+ * do the large send (BTLP :-) ).
+ */
+ goto go_for_it;
+ }
+ bbr_clone_rsm(bbr, nrsm, rsm, (rsm->r_end - maxseg));
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ rsm->r_flags &= (~BBR_HAS_FIN);
+ rsm = nrsm;
+ }
+go_for_it:
+ bbr->r_ctl.rc_tlp_send = rsm;
+ bbr->rc_tlp_rtx_out = 1;
+ if (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) {
+ bbr->r_ctl.rc_tlp_seg_send_cnt++;
+ tp->t_rxtshift++;
+ } else {
+ bbr->r_ctl.rc_last_tlp_seq = rsm->r_start;
+ bbr->r_ctl.rc_tlp_seg_send_cnt = 1;
+ }
+send:
+ if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) {
+ /*
+ * Can't [re]/transmit a segment we have retranmitted the
+ * max times. We need the retransmit timer to take over.
+ */
+restore:
+ bbr->rc_tlp_new_data = 0;
+ bbr->r_ctl.rc_tlp_send = NULL;
+ if (rsm)
+ rsm->r_flags &= ~BBR_TLP;
+ BBR_STAT_INC(bbr_tlp_retran_fail);
+ return (0);
+ } else if (rsm) {
+ rsm->r_flags |= BBR_TLP;
+ }
+ if (rsm && (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) &&
+ (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend)) {
+ /*
+ * We have retransmitted to many times for TLP. Switch to
+ * the regular RTO timer
+ */
+ goto restore;
+ }
+ bbr_log_to_event(bbr, cts, BBR_TO_FRM_TLP);
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
+ return (0);
+}
+
+/*
+ * Delayed ack Timer, here we simply need to setup the
+ * ACK_NOW flag and remove the DELACK flag. From there
+ * the output routine will send the ack out.
+ *
+ * We only return 1, saying don't proceed, if all timers
+ * are stopped (destroyed PCB?).
+ */
+static int
+bbr_timeout_delack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ if (bbr->rc_all_timers_stopped) {
+ return (1);
+ }
+ bbr_log_to_event(bbr, cts, BBR_TO_FRM_DELACK);
+ tp->t_flags &= ~TF_DELACK;
+ tp->t_flags |= TF_ACKNOW;
+ TCPSTAT_INC(tcps_delack);
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK;
+ return (0);
+}
+
+/*
+ * Persists timer, here we simply need to setup the
+ * FORCE-DATA flag the output routine will send
+ * the one byte send.
+ *
+ * We only return 1, saying don't proceed, if all timers
+ * are stopped (destroyed PCB?).
+ */
+static int
+bbr_timeout_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ struct tcptemp *t_template;
+ int32_t retval = 1;
+
+ if (bbr->rc_all_timers_stopped) {
+ return (1);
+ }
+ if (bbr->rc_in_persist == 0)
+ return (0);
+ KASSERT(tp->t_inpcb != NULL,
+ ("%s: tp %p tp->t_inpcb == NULL", __func__, tp));
+ /*
+ * Persistence timer into zero window. Force a byte to be output, if
+ * possible.
+ */
+ bbr_log_to_event(bbr, cts, BBR_TO_FRM_PERSIST);
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT;
+ TCPSTAT_INC(tcps_persisttimeo);
+ /*
+ * Have we exceeded the user specified progress time?
+ */
+ if (bbr_progress_timeout_check(bbr)) {
+ tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
+ goto out;
+ }
+ /*
+ * Hack: if the peer is dead/unreachable, we do not time out if the
+ * window is closed. After a full backoff, drop the connection if
+ * the idle time (no responses to probes) reaches the maximum
+ * backoff that we would use if retransmitting.
+ */
+ if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
+ (ticks - tp->t_rcvtime >= tcp_maxpersistidle ||
+ ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
+ TCPSTAT_INC(tcps_persistdrop);
+ tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
+ goto out;
+ }
+ if ((sbavail(&bbr->rc_inp->inp_socket->so_snd) == 0) &&
+ tp->snd_una == tp->snd_max) {
+ bbr_exit_persist(tp, bbr, cts, __LINE__);
+ retval = 0;
+ goto out;
+ }
+ /*
+ * If the user has closed the socket then drop a persisting
+ * connection after a much reduced timeout.
+ */
+ if (tp->t_state > TCPS_CLOSE_WAIT &&
+ (ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
+ TCPSTAT_INC(tcps_persistdrop);
+ tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
+ goto out;
+ }
+ t_template = tcpip_maketemplate(bbr->rc_inp);
+ if (t_template) {
+ tcp_respond(tp, t_template->tt_ipgen,
+ &t_template->tt_t, (struct mbuf *)NULL,
+ tp->rcv_nxt, tp->snd_una - 1, 0);
+ /* This sends an ack */
+ if (tp->t_flags & TF_DELACK)
+ tp->t_flags &= ~TF_DELACK;
+ free(t_template, M_TEMP);
+ }
+ if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
+ tp->t_rxtshift++;
+ bbr_start_hpts_timer(bbr, tp, cts, 3, 0, 0);
+out:
+ return (retval);
+}
+
+/*
+ * If a keepalive goes off, we had no other timers
+ * happening. We always return 1 here since this
+ * routine either drops the connection or sends
+ * out a segment with respond.
+ */
+static int
+bbr_timeout_keepalive(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ struct tcptemp *t_template;
+ struct inpcb *inp;
+
+ if (bbr->rc_all_timers_stopped) {
+ return (1);
+ }
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP;
+ inp = tp->t_inpcb;
+ bbr_log_to_event(bbr, cts, BBR_TO_FRM_KEEP);
+ /*
+ * Keep-alive timer went off; send something or drop connection if
+ * idle for too long.
+ */
+ TCPSTAT_INC(tcps_keeptimeo);
+ if (tp->t_state < TCPS_ESTABLISHED)
+ goto dropit;
+ if ((tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
+ tp->t_state <= TCPS_CLOSING) {
+ if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp))
+ goto dropit;
+ /*
+ * Send a packet designed to force a response if the peer is
+ * up and reachable: either an ACK if the connection is
+ * still alive, or an RST if the peer has closed the
+ * connection due to timeout or reboot. Using sequence
+ * number tp->snd_una-1 causes the transmitted zero-length
+ * segment to lie outside the receive window; by the
+ * protocol spec, this requires the correspondent TCP to
+ * respond.
+ */
+ TCPSTAT_INC(tcps_keepprobe);
+ t_template = tcpip_maketemplate(inp);
+ if (t_template) {
+ tcp_respond(tp, t_template->tt_ipgen,
+ &t_template->tt_t, (struct mbuf *)NULL,
+ tp->rcv_nxt, tp->snd_una - 1, 0);
+ free(t_template, M_TEMP);
+ }
+ }
+ bbr_start_hpts_timer(bbr, tp, cts, 4, 0, 0);
+ return (1);
+dropit:
+ TCPSTAT_INC(tcps_keepdrops);
+ tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
+ return (1);
+}
+
+/*
+ * Retransmit helper function, clear up all the ack
+ * flags and take care of important book keeping.
+ */
+static void
+bbr_remxt_tmr(struct tcpcb *tp)
+{
+ /*
+ * The retransmit timer went off, all sack'd blocks must be
+ * un-acked.
+ */
+ struct bbr_sendmap *rsm, *trsm = NULL;
+ struct tcp_bbr *bbr;
+ uint32_t cts, lost;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ cts = tcp_get_usecs(&bbr->rc_tv);
+ lost = bbr->r_ctl.rc_lost;
+ if (bbr->r_state && (bbr->r_state != tp->t_state))
+ bbr_set_state(tp, bbr, 0);
+
+ TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) {
+ if (rsm->r_flags & BBR_ACKED) {
+ uint32_t old_flags;
+
+ rsm->r_dupack = 0;
+ if (rsm->r_in_tmap == 0) {
+ /* We must re-add it back to the tlist */
+ if (trsm == NULL) {
+ TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ } else {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, trsm, rsm, r_tnext);
+ }
+ rsm->r_in_tmap = 1;
+ }
+ old_flags = rsm->r_flags;
+ rsm->r_flags |= BBR_RXT_CLEARED;
+ rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS);
+ bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__);
+ } else {
+ if ((rsm->r_flags & BBR_MARKED_LOST) == 0) {
+ bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start;
+ bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start;
+ }
+ if (bbr_marks_rxt_sack_passed) {
+ /*
+ * With this option, we will rack out
+ * in 1ms increments the rest of the packets.
+ */
+ rsm->r_flags |= BBR_SACK_PASSED | BBR_MARKED_LOST;
+ rsm->r_flags &= ~BBR_WAS_SACKPASS;
+ } else {
+ /*
+ * With this option we only mark them lost
+ * and remove all sack'd markings. We will run
+ * another RXT or a TLP. This will cause
+ * us to eventually send more based on what
+ * ack's come in.
+ */
+ rsm->r_flags |= BBR_MARKED_LOST;
+ rsm->r_flags &= ~BBR_WAS_SACKPASS;
+ rsm->r_flags &= ~BBR_SACK_PASSED;
+ }
+ }
+ trsm = rsm;
+ }
+ bbr->r_ctl.rc_resend = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ /* Clear the count (we just un-acked them) */
+ bbr_log_to_event(bbr, cts, BBR_TO_FRM_TMR);
+ bbr->rc_tlp_new_data = 0;
+ bbr->r_ctl.rc_tlp_seg_send_cnt = 0;
+ /* zap the behindness on a rxt */
+ bbr->r_ctl.rc_hptsi_agg_delay = 0;
+ bbr->r_agg_early_set = 0;
+ bbr->r_ctl.rc_agg_early = 0;
+ bbr->rc_tlp_rtx_out = 0;
+ bbr->r_ctl.rc_sacked = 0;
+ bbr->r_ctl.rc_sacklast = NULL;
+ bbr->r_timer_override = 1;
+ bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost));
+}
+
+/*
+ * Re-transmit timeout! If we drop the PCB we will return 1, otherwise
+ * we will setup to retransmit the lowest seq number outstanding.
+ */
+static int
+bbr_timeout_rxt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ int32_t rexmt;
+ int32_t retval = 0;
+
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT;
+ if (bbr->rc_all_timers_stopped) {
+ return (1);
+ }
+ if (TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->snd_una == tp->snd_max)) {
+ /* Nothing outstanding .. nothing to do */
+ return (0);
+ }
+ /*
+ * Retransmission timer went off. Message has not been acked within
+ * retransmit interval. Back off to a longer retransmit interval
+ * and retransmit one segment.
+ */
+ if (bbr_progress_timeout_check(bbr)) {
+ retval = 1;
+ tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
+ goto out;
+ }
+ bbr_remxt_tmr(tp);
+ if ((bbr->r_ctl.rc_resend == NULL) ||
+ ((bbr->r_ctl.rc_resend->r_flags & BBR_RWND_COLLAPSED) == 0)) {
+ /*
+ * If the rwnd collapsed on
+ * the one we are retransmitting
+ * it does not count against the
+ * rxt count.
+ */
+ tp->t_rxtshift++;
+ }
+ if (tp->t_rxtshift > TCP_MAXRXTSHIFT) {
+ tp->t_rxtshift = TCP_MAXRXTSHIFT;
+ TCPSTAT_INC(tcps_timeoutdrop);
+ retval = 1;
+ tcp_set_inp_to_drop(bbr->rc_inp,
+ (tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT));
+ goto out;
+ }
+ if (tp->t_state == TCPS_SYN_SENT) {
+ /*
+ * If the SYN was retransmitted, indicate CWND to be limited
+ * to 1 segment in cc_conn_init().
+ */
+ tp->snd_cwnd = 1;
+ } else if (tp->t_rxtshift == 1) {
+ /*
+ * first retransmit; record ssthresh and cwnd so they can be
+ * recovered if this turns out to be a "bad" retransmit. A
+ * retransmit is considered "bad" if an ACK for this segment
+ * is received within RTT/2 interval; the assumption here is
+ * that the ACK was already in flight. See "On Estimating
+ * End-to-End Network Path Properties" by Allman and Paxson
+ * for more details.
+ */
+ tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options;
+ if (!IN_RECOVERY(tp->t_flags)) {
+ tp->snd_cwnd_prev = tp->snd_cwnd;
+ tp->snd_ssthresh_prev = tp->snd_ssthresh;
+ tp->snd_recover_prev = tp->snd_recover;
+ tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
+ tp->t_flags |= TF_PREVVALID;
+ } else {
+ tp->t_flags &= ~TF_PREVVALID;
+ }
+ tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options;
+ } else {
+ tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options;
+ tp->t_flags &= ~TF_PREVVALID;
+ }
+ TCPSTAT_INC(tcps_rexmttimeo);
+ if ((tp->t_state == TCPS_SYN_SENT) ||
+ (tp->t_state == TCPS_SYN_RECEIVED))
+ rexmt = USEC_2_TICKS(BBR_INITIAL_RTO) * tcp_backoff[tp->t_rxtshift];
+ else
+ rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
+ TCPT_RANGESET(tp->t_rxtcur, rexmt,
+ MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms),
+ MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000));
+ /*
+ * We enter the path for PLMTUD if connection is established or, if
+ * connection is FIN_WAIT_1 status, reason for the last is that if
+ * amount of data we send is very small, we could send it in couple
+ * of packets and process straight to FIN. In that case we won't
+ * catch ESTABLISHED state.
+ */
+ if (V_tcp_pmtud_blackhole_detect && (((tp->t_state == TCPS_ESTABLISHED))
+ || (tp->t_state == TCPS_FIN_WAIT_1))) {
+#ifdef INET6
+ int32_t isipv6;
+#endif
+
+ /*
+ * Idea here is that at each stage of mtu probe (usually,
+ * 1448 -> 1188 -> 524) should be given 2 chances to recover
+ * before further clamping down. 'tp->t_rxtshift % 2 == 0'
+ * should take care of that.
+ */
+ if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) ==
+ (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) &&
+ (tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 &&
+ tp->t_rxtshift % 2 == 0)) {
+ /*
+ * Enter Path MTU Black-hole Detection mechanism: -
+ * Disable Path MTU Discovery (IP "DF" bit). -
+ * Reduce MTU to lower value than what we negotiated
+ * with peer.
+ */
+ if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) {
+ /*
+ * Record that we may have found a black
+ * hole.
+ */
+ tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE;
+ /* Keep track of previous MSS. */
+ tp->t_pmtud_saved_maxseg = tp->t_maxseg;
+ }
+ /*
+ * Reduce the MSS to blackhole value or to the
+ * default in an attempt to retransmit.
+ */
+#ifdef INET6
+ isipv6 = bbr->r_is_v6;
+ if (isipv6 &&
+ tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) {
+ /* Use the sysctl tuneable blackhole MSS. */
+ tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss;
+ TCPSTAT_INC(tcps_pmtud_blackhole_activated);
+ } else if (isipv6) {
+ /* Use the default MSS. */
+ tp->t_maxseg = V_tcp_v6mssdflt;
+ /*
+ * Disable Path MTU Discovery when we switch
+ * to minmss.
+ */
+ tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
+ TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
+ }
+#endif
+#if defined(INET6) && defined(INET)
+ else
+#endif
+#ifdef INET
+ if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) {
+ /* Use the sysctl tuneable blackhole MSS. */
+ tp->t_maxseg = V_tcp_pmtud_blackhole_mss;
+ TCPSTAT_INC(tcps_pmtud_blackhole_activated);
+ } else {
+ /* Use the default MSS. */
+ tp->t_maxseg = V_tcp_mssdflt;
+ /*
+ * Disable Path MTU Discovery when we switch
+ * to minmss.
+ */
+ tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
+ TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
+ }
+#endif
+ } else {
+ /*
+ * If further retransmissions are still unsuccessful
+ * with a lowered MTU, maybe this isn't a blackhole
+ * and we restore the previous MSS and blackhole
+ * detection flags. The limit '6' is determined by
+ * giving each probe stage (1448, 1188, 524) 2
+ * chances to recover.
+ */
+ if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) &&
+ (tp->t_rxtshift >= 6)) {
+ tp->t_flags2 |= TF2_PLPMTU_PMTUD;
+ tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE;
+ tp->t_maxseg = tp->t_pmtud_saved_maxseg;
+ TCPSTAT_INC(tcps_pmtud_blackhole_failed);
+ }
+ }
+ }
+ /*
+ * Disable RFC1323 and SACK if we haven't got any response to our
+ * third SYN to work-around some broken terminal servers (most of
+ * which have hopefully been retired) that have bad VJ header
+ * compression code which trashes TCP segments containing
+ * unknown-to-them TCP options.
+ */
+ if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) &&
+ (tp->t_rxtshift == 3))
+ tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT);
+ /*
+ * If we backed off this far, our srtt estimate is probably bogus.
+ * Clobber it so we'll take the next rtt measurement as our srtt;
+ * move the current srtt into rttvar to keep the current retransmit
+ * times until then.
+ */
+ if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
+#ifdef INET6
+ if (bbr->r_is_v6)
+ in6_losing(tp->t_inpcb);
+ else
+#endif
+ in_losing(tp->t_inpcb);
+ tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
+ tp->t_srtt = 0;
+ }
+ sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
+ tp->snd_recover = tp->snd_max;
+ tp->t_flags |= TF_ACKNOW;
+ tp->t_rtttime = 0;
+out:
+ return (retval);
+}
+
+static int
+bbr_process_timers(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, uint8_t hpts_calling)
+{
+ int32_t ret = 0;
+ int32_t timers = (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK);
+
+ if (timers == 0) {
+ return (0);
+ }
+ if (tp->t_state == TCPS_LISTEN) {
+ /* no timers on listen sockets */
+ if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)
+ return (0);
+ return (1);
+ }
+ if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) {
+ uint32_t left;
+
+ if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
+ ret = -1;
+ bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling);
+ return (0);
+ }
+ if (hpts_calling == 0) {
+ ret = -2;
+ bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling);
+ return (0);
+ }
+ /*
+ * Ok our timer went off early and we are not paced false
+ * alarm, go back to sleep.
+ */
+ left = bbr->r_ctl.rc_timer_exp - cts;
+ ret = -3;
+ bbr_log_to_processing(bbr, cts, ret, left, hpts_calling);
+ tcp_hpts_insert(tp->t_inpcb, HPTS_USEC_TO_SLOTS(left));
+ return (1);
+ }
+ bbr->rc_tmr_stopped = 0;
+ bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK;
+ if (timers & PACE_TMR_DELACK) {
+ ret = bbr_timeout_delack(tp, bbr, cts);
+ } else if (timers & PACE_TMR_PERSIT) {
+ ret = bbr_timeout_persist(tp, bbr, cts);
+ } else if (timers & PACE_TMR_RACK) {
+ bbr->r_ctl.rc_tlp_rxt_last_time = cts;
+ ret = bbr_timeout_rack(tp, bbr, cts);
+ } else if (timers & PACE_TMR_TLP) {
+ bbr->r_ctl.rc_tlp_rxt_last_time = cts;
+ ret = bbr_timeout_tlp(tp, bbr, cts);
+ } else if (timers & PACE_TMR_RXT) {
+ bbr->r_ctl.rc_tlp_rxt_last_time = cts;
+ ret = bbr_timeout_rxt(tp, bbr, cts);
+ } else if (timers & PACE_TMR_KEEP) {
+ ret = bbr_timeout_keepalive(tp, bbr, cts);
+ }
+ bbr_log_to_processing(bbr, cts, ret, timers, hpts_calling);
+ return (ret);
+}
+
+static void
+bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts)
+{
+ if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
+ uint8_t hpts_removed = 0;
+
+ if (bbr->rc_inp->inp_in_hpts &&
+ (bbr->rc_timer_first == 1)) {
+ /*
+ * If we are canceling timer's when we have the
+ * timer ahead of the output being paced. We also
+ * must remove ourselves from the hpts.
+ */
+ hpts_removed = 1;
+ tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT);
+ if (bbr->r_ctl.rc_last_delay_val) {
+ /* Update the last hptsi delay too */
+ uint32_t time_since_send;
+
+ if (TSTMP_GT(cts, bbr->rc_pacer_started))
+ time_since_send = cts - bbr->rc_pacer_started;
+ else
+ time_since_send = 0;
+ if (bbr->r_ctl.rc_last_delay_val > time_since_send) {
+ /* Cut down our slot time */
+ bbr->r_ctl.rc_last_delay_val -= time_since_send;
+ } else {
+ bbr->r_ctl.rc_last_delay_val = 0;
+ }
+ bbr->rc_pacer_started = cts;
+ }
+ }
+ bbr->rc_timer_first = 0;
+ bbr_log_to_cancel(bbr, line, cts, hpts_removed);
+ bbr->rc_tmr_stopped = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
+ bbr->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK);
+ }
+}
+
+static void
+bbr_timer_stop(struct tcpcb *tp, uint32_t timer_type)
+{
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ bbr->rc_all_timers_stopped = 1;
+ return;
+}
+
+/*
+ * stop all timers always returning 0.
+ */
+static int
+bbr_stopall(struct tcpcb *tp)
+{
+ return (0);
+}
+
+static void
+bbr_timer_activate(struct tcpcb *tp, uint32_t timer_type, uint32_t delta)
+{
+ return;
+}
+
+/*
+ * return true if a bbr timer (rack or tlp) is active.
+ */
+static int
+bbr_timer_active(struct tcpcb *tp, uint32_t timer_type)
+{
+ return (0);
+}
+
+static uint32_t
+bbr_get_earliest_send_outstanding(struct tcp_bbr *bbr, struct bbr_sendmap *u_rsm, uint32_t cts)
+{
+ struct bbr_sendmap *rsm;
+
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap);
+ if ((rsm == NULL) || (u_rsm == rsm))
+ return (cts);
+ return(rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]);
+}
+
+static void
+bbr_update_rsm(struct tcpcb *tp, struct tcp_bbr *bbr,
+ struct bbr_sendmap *rsm, uint32_t cts, uint32_t pacing_time)
+{
+ int32_t idx;
+
+ rsm->r_rtr_cnt++;
+ rsm->r_dupack = 0;
+ if (rsm->r_rtr_cnt > BBR_NUM_OF_RETRANS) {
+ rsm->r_rtr_cnt = BBR_NUM_OF_RETRANS;
+ rsm->r_flags |= BBR_OVERMAX;
+ }
+ if (rsm->r_flags & BBR_RWND_COLLAPSED) {
+ /* Take off the collapsed flag at rxt */
+ rsm->r_flags &= ~BBR_RWND_COLLAPSED;
+ }
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ /* We have retransmitted, its no longer lost */
+ rsm->r_flags &= ~BBR_MARKED_LOST;
+ bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start;
+ }
+ if (rsm->r_flags & BBR_RXT_CLEARED) {
+ /*
+ * We hit a RXT timer on it and
+ * we cleared the "acked" flag.
+ * We now have it going back into
+ * flight, we can remove the cleared
+ * flag and possibly do accounting on
+ * this piece.
+ */
+ rsm->r_flags &= ~BBR_RXT_CLEARED;
+ }
+ if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & BBR_TLP) == 0)) {
+ bbr->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start);
+ rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start);
+ }
+ idx = rsm->r_rtr_cnt - 1;
+ rsm->r_tim_lastsent[idx] = cts;
+ rsm->r_pacing_delay = pacing_time;
+ rsm->r_delivered = bbr->r_ctl.rc_delivered;
+ rsm->r_ts_valid = bbr->rc_ts_valid;
+ if (bbr->rc_ts_valid)
+ rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts;
+ if (bbr->r_ctl.r_app_limited_until)
+ rsm->r_app_limited = 1;
+ else
+ rsm->r_app_limited = 0;
+ if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW)
+ rsm->r_bbr_state = bbr_state_val(bbr);
+ else
+ rsm->r_bbr_state = 8;
+ if (rsm->r_flags & BBR_ACKED) {
+ /* Problably MTU discovery messing with us */
+ uint32_t old_flags;
+
+ old_flags = rsm->r_flags;
+ rsm->r_flags &= ~BBR_ACKED;
+ bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__);
+ bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
+ if (bbr->r_ctl.rc_sacked == 0)
+ bbr->r_ctl.rc_sacklast = NULL;
+ }
+ if (rsm->r_in_tmap) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ }
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 1;
+ if (rsm->r_flags & BBR_SACK_PASSED) {
+ /* We have retransmitted due to the SACK pass */
+ rsm->r_flags &= ~BBR_SACK_PASSED;
+ rsm->r_flags |= BBR_WAS_SACKPASS;
+ }
+ rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts);
+ rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next);
+ if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) {
+ rsm->r_is_gain = 1;
+ rsm->r_is_drain = 0;
+ } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) {
+ rsm->r_is_drain = 1;
+ rsm->r_is_gain = 0;
+ } else {
+ rsm->r_is_drain = 0;
+ rsm->r_is_gain = 0;
+ }
+ rsm->r_del_time = bbr->r_ctl.rc_del_time; /* TEMP GOOGLE CODE */
+}
+
+/*
+ * Returns 0, or the sequence where we stopped
+ * updating. We also update the lenp to be the amount
+ * of data left.
+ */
+
+static uint32_t
+bbr_update_entry(struct tcpcb *tp, struct tcp_bbr *bbr,
+ struct bbr_sendmap *rsm, uint32_t cts, int32_t *lenp, uint32_t pacing_time)
+{
+ /*
+ * We (re-)transmitted starting at rsm->r_start for some length
+ * (possibly less than r_end.
+ */
+ struct bbr_sendmap *nrsm;
+ uint32_t c_end;
+ int32_t len;
+
+ len = *lenp;
+ c_end = rsm->r_start + len;
+ if (SEQ_GEQ(c_end, rsm->r_end)) {
+ /*
+ * We retransmitted the whole piece or more than the whole
+ * slopping into the next rsm.
+ */
+ bbr_update_rsm(tp, bbr, rsm, cts, pacing_time);
+ if (c_end == rsm->r_end) {
+ *lenp = 0;
+ return (0);
+ } else {
+ int32_t act_len;
+
+ /* Hangs over the end return whats left */
+ act_len = rsm->r_end - rsm->r_start;
+ *lenp = (len - act_len);
+ return (rsm->r_end);
+ }
+ /* We don't get out of this block. */
+ }
+ /*
+ * Here we retransmitted less than the whole thing which means we
+ * have to split this into what was transmitted and what was not.
+ */
+ nrsm = bbr_alloc_full_limit(bbr);
+ if (nrsm == NULL) {
+ *lenp = 0;
+ return (0);
+ }
+ /*
+ * So here we are going to take the original rsm and make it what we
+ * retransmitted. nrsm will be the tail portion we did not
+ * retransmit. For example say the chunk was 1, 11 (10 bytes). And
+ * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to
+ * 1, 6 and the new piece will be 6, 11.
+ */
+ bbr_clone_rsm(bbr, nrsm, rsm, c_end);
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next);
+ nrsm->r_dupack = 0;
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ rsm->r_flags &= (~BBR_HAS_FIN);
+ bbr_update_rsm(tp, bbr, rsm, cts, pacing_time);
+ *lenp = 0;
+ return (0);
+}
+
+static uint64_t
+bbr_get_hardware_rate(struct tcp_bbr *bbr)
+{
+ uint64_t bw;
+
+ bw = bbr_get_bw(bbr);
+ bw *= (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN];
+ bw /= (uint64_t)BBR_UNIT;
+ return(bw);
+}
+
+static void
+bbr_setup_less_of_rate(struct tcp_bbr *bbr, uint32_t cts,
+ uint64_t act_rate, uint64_t rate_wanted)
+{
+ /*
+ * We could not get a full gains worth
+ * of rate.
+ */
+ if (get_filter_value(&bbr->r_ctl.rc_delrate) >= act_rate) {
+ /* we can't even get the real rate */
+ uint64_t red;
+
+ bbr->skip_gain = 1;
+ bbr->gain_is_limited = 0;
+ red = get_filter_value(&bbr->r_ctl.rc_delrate) - act_rate;
+ if (red)
+ filter_reduce_by(&bbr->r_ctl.rc_delrate, red, cts);
+ } else {
+ /* We can use a lower gain */
+ bbr->skip_gain = 0;
+ bbr->gain_is_limited = 1;
+ }
+}
+
+static void
+bbr_update_hardware_pacing_rate(struct tcp_bbr *bbr, uint32_t cts)
+{
+ const struct tcp_hwrate_limit_table *nrte;
+ int error, rate = -1;
+
+ if (bbr->r_ctl.crte == NULL)
+ return;
+ if ((bbr->rc_inp->inp_route.ro_rt == NULL) ||
+ (bbr->rc_inp->inp_route.ro_rt->rt_ifp == NULL)) {
+ /* Lost our routes? */
+ /* Clear the way for a re-attempt */
+ bbr->bbr_attempt_hdwr_pace = 0;
+lost_rate:
+ bbr->gain_is_limited = 0;
+ bbr->skip_gain = 0;
+ bbr->bbr_hdrw_pacing = 0;
+ counter_u64_add(bbr_flows_whdwr_pacing, -1);
+ counter_u64_add(bbr_flows_nohdwr_pacing, 1);
+ tcp_bbr_tso_size_check(bbr, cts);
+ return;
+ }
+ rate = bbr_get_hardware_rate(bbr);
+ nrte = tcp_chg_pacing_rate(bbr->r_ctl.crte,
+ bbr->rc_tp,
+ bbr->rc_inp->inp_route.ro_rt->rt_ifp,
+ rate,
+ (RS_PACING_GEQ|RS_PACING_SUB_OK),
+ &error);
+ if (nrte == NULL) {
+ goto lost_rate;
+ }
+ if (nrte != bbr->r_ctl.crte) {
+ bbr->r_ctl.crte = nrte;
+ if (error == 0) {
+ BBR_STAT_INC(bbr_hdwr_rl_mod_ok);
+ if (bbr->r_ctl.crte->rate < rate) {
+ /* We have a problem */
+ bbr_setup_less_of_rate(bbr, cts,
+ bbr->r_ctl.crte->rate, rate);
+ } else {
+ /* We are good */
+ bbr->gain_is_limited = 0;
+ bbr->skip_gain = 0;
+ }
+ } else {
+ /* A failure should release the tag */
+ BBR_STAT_INC(bbr_hdwr_rl_mod_fail);
+ bbr->gain_is_limited = 0;
+ bbr->skip_gain = 0;
+ bbr->bbr_hdrw_pacing = 0;
+ }
+ bbr_type_log_hdwr_pacing(bbr,
+ bbr->r_ctl.crte->ptbl->rs_ifp,
+ rate,
+ ((bbr->r_ctl.crte == NULL) ? 0 : bbr->r_ctl.crte->rate),
+ __LINE__,
+ cts,
+ error);
+ }
+}
+
+static void
+bbr_adjust_for_hw_pacing(struct tcp_bbr *bbr, uint32_t cts)
+{
+ /*
+ * If we have hardware pacing support
+ * we need to factor that in for our
+ * TSO size.
+ */
+ const struct tcp_hwrate_limit_table *rlp;
+ uint32_t cur_delay, seg_sz, maxseg, new_tso, delta, hdwr_delay;
+
+ if ((bbr->bbr_hdrw_pacing == 0) ||
+ (IN_RECOVERY(bbr->rc_tp->t_flags)) ||
+ (bbr->r_ctl.crte == NULL))
+ return;
+ if (bbr->hw_pacing_set == 0) {
+ /* Not yet by the hdwr pacing count delay */
+ return;
+ }
+ if (bbr_hdwr_pace_adjust == 0) {
+ /* No adjustment */
+ return;
+ }
+ rlp = bbr->r_ctl.crte;
+ if (bbr->rc_tp->t_maxseg > bbr->rc_last_options)
+ maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options;
+ else
+ maxseg = BBR_MIN_SEG - bbr->rc_last_options;
+ /*
+ * So lets first get the
+ * time we will take between
+ * TSO sized sends currently without
+ * hardware help.
+ */
+ cur_delay = bbr_get_pacing_delay(bbr, BBR_UNIT,
+ bbr->r_ctl.rc_pace_max_segs, cts, 1);
+ hdwr_delay = bbr->r_ctl.rc_pace_max_segs / maxseg;
+ hdwr_delay *= rlp->time_between;
+ if (cur_delay > hdwr_delay)
+ delta = cur_delay - hdwr_delay;
+ else
+ delta = 0;
+ bbr_log_type_tsosize(bbr, cts, delta, cur_delay, hdwr_delay,
+ (bbr->r_ctl.rc_pace_max_segs / maxseg),
+ 1);
+ if (delta &&
+ (delta < (max(rlp->time_between,
+ bbr->r_ctl.bbr_hptsi_segments_delay_tar)))) {
+ /*
+ * Now lets divide by the pacing
+ * time between each segment the
+ * hardware sends rounding up and
+ * derive a bytes from that. We multiply
+ * that by bbr_hdwr_pace_adjust to get
+ * more bang for our buck.
+ *
+ * The goal is to have the software pacer
+ * waiting no more than an additional
+ * pacing delay if we can (without the
+ * compensation i.e. x bbr_hdwr_pace_adjust).
+ */
+ seg_sz = max(((cur_delay + rlp->time_between)/rlp->time_between),
+ (bbr->r_ctl.rc_pace_max_segs/maxseg));
+ seg_sz *= bbr_hdwr_pace_adjust;
+ if (bbr_hdwr_pace_floor &&
+ (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) {
+ /* Currently hardware paces
+ * out rs_min_seg segments at a time.
+ * We need to make sure we always send at least
+ * a full burst of bbr_hdwr_pace_floor down.
+ */
+ seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg;
+ }
+ seg_sz *= maxseg;
+ } else if (delta == 0) {
+ /*
+ * The highest pacing rate is
+ * above our b/w gained. This means
+ * we probably are going quite fast at
+ * the hardware highest rate. Lets just multiply
+ * the calculated TSO size by the
+ * multiplier factor (its probably
+ * 4 segments in the default config for
+ * mlx).
+ */
+ seg_sz = bbr->r_ctl.rc_pace_max_segs * bbr_hdwr_pace_adjust;
+ if (bbr_hdwr_pace_floor &&
+ (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) {
+ /* Currently hardware paces
+ * out rs_min_seg segments at a time.
+ * We need to make sure we always send at least
+ * a full burst of bbr_hdwr_pace_floor down.
+ */
+ seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg;
+ }
+ } else {
+ /*
+ * The pacing time difference is so
+ * big that the hardware will
+ * pace out more rapidly then we
+ * really want and then we
+ * will have a long delay. Lets just keep
+ * the same TSO size so its as if
+ * we were not using hdwr pacing (we
+ * just gain a bit of spacing from the
+ * hardware if seg_sz > 1).
+ */
+ seg_sz = bbr->r_ctl.rc_pace_max_segs;
+ }
+ if (seg_sz > bbr->r_ctl.rc_pace_max_segs)
+ new_tso = seg_sz;
+ else
+ new_tso = bbr->r_ctl.rc_pace_max_segs;
+ if (new_tso >= (PACE_MAX_IP_BYTES-maxseg))
+ new_tso = PACE_MAX_IP_BYTES - maxseg;
+
+ if (new_tso != bbr->r_ctl.rc_pace_max_segs) {
+ bbr_log_type_tsosize(bbr, cts, new_tso, 0, bbr->r_ctl.rc_pace_max_segs, maxseg, 0);
+ bbr->r_ctl.rc_pace_max_segs = new_tso;
+ }
+}
+
+static void
+tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts)
+{
+ uint64_t bw;
+ uint32_t old_tso = 0, new_tso;
+ uint32_t maxseg, bytes;
+ uint32_t tls_seg=0;
+ /*
+ * Google/linux uses the following algorithm to determine
+ * the TSO size based on the b/w of the link (from Neal Cardwell email 9/27/18):
+ *
+ * bytes = bw_in_bytes_per_second / 1000
+ * bytes = min(bytes, 64k)
+ * tso_segs = bytes / MSS
+ * if (bw < 1.2Mbs)
+ * min_tso_segs = 1
+ * else
+ * min_tso_segs = 2
+ * tso_segs = max(tso_segs, min_tso_segs)
+ *
+ * * Note apply a device specific limit (we apply this in the
+ * tcp_m_copym).
+ * Note that before the initial measurement is made google bursts out
+ * a full iwnd just like new-reno/cubic.
+ *
+ * We do not use this algorithm. Instead we
+ * use a two phased approach:
+ *
+ * if ( bw <= per-tcb-cross-over)
+ * goal_tso = calculate how much with this bw we
+ * can send in goal-time seconds.
+ * if (goal_tso > mss)
+ * seg = goal_tso / mss
+ * tso = seg * mss
+ * else
+ * tso = mss
+ * if (tso > per-tcb-max)
+ * tso = per-tcb-max
+ * else if ( bw > 512Mbps)
+ * tso = max-tso (64k/mss)
+ * else
+ * goal_tso = bw / per-tcb-divsor
+ * seg = (goal_tso + mss-1)/mss
+ * tso = seg * mss
+ *
+ * if (tso < per-tcb-floor)
+ * tso = per-tcb-floor
+ * if (tso > per-tcb-utter_max)
+ * tso = per-tcb-utter_max
+ *
+ * Note the default per-tcb-divisor is 1000 (same as google).
+ * the goal cross over is 30Mbps however. To recreate googles
+ * algorithm you need to set:
+ *
+ * cross-over = 23,168,000 bps
+ * goal-time = 18000
+ * per-tcb-max = 2
+ * per-tcb-divisor = 1000
+ * per-tcb-floor = 1
+ *
+ * This will get you "google bbr" behavior with respect to tso size.
+ *
+ * Note we do set anything TSO size until we are past the initial
+ * window. Before that we gnerally use either a single MSS
+ * or we use the full IW size (so we burst a IW at a time)
+ * Also note that Hardware-TLS is special and does alternate
+ * things to minimize PCI Bus Bandwidth use.
+ */
+
+ if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) {
+ maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options;
+ } else {
+ maxseg = BBR_MIN_SEG - bbr->rc_last_options;
+ }
+#ifdef KERN_TLS
+ if (bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) {
+ tls_seg = ctf_get_opt_tls_size(bbr->rc_inp->inp_socket, bbr->rc_tp->snd_wnd);
+ bbr->r_ctl.rc_pace_min_segs = (tls_seg + bbr->rc_last_options);
+ }
+#endif
+ old_tso = bbr->r_ctl.rc_pace_max_segs;
+ if (bbr->rc_past_init_win == 0) {
+ /*
+ * Not enough data has been acknowledged to make a
+ * judgement unless we are hardware TLS. Set up
+ * the inital TSO based on if we are sending a
+ * full IW at once or not.
+ */
+ if (bbr->rc_use_google)
+ bbr->r_ctl.rc_pace_max_segs = ((bbr->rc_tp->t_maxseg - bbr->rc_last_options) * 2);
+ else if (bbr->bbr_init_win_cheat)
+ bbr->r_ctl.rc_pace_max_segs = bbr_initial_cwnd(bbr, bbr->rc_tp);
+ else
+ bbr->r_ctl.rc_pace_max_segs = bbr->rc_tp->t_maxseg - bbr->rc_last_options;
+ if (bbr->r_ctl.rc_pace_min_segs != bbr->rc_tp->t_maxseg)
+ bbr->r_ctl.rc_pace_min_segs = bbr->rc_tp->t_maxseg;
+#ifdef KERN_TLS
+ if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) && tls_seg) {
+ /*
+ * For hardware TLS we set our min to the tls_seg size.
+ */
+ bbr->r_ctl.rc_pace_max_segs = tls_seg;
+ bbr->r_ctl.rc_pace_min_segs = tls_seg + bbr->rc_last_options;
+ }
+#endif
+ if (bbr->r_ctl.rc_pace_max_segs == 0) {
+ bbr->r_ctl.rc_pace_max_segs = maxseg;
+ }
+ bbr_log_type_tsosize(bbr, cts, bbr->r_ctl.rc_pace_max_segs, tls_seg, old_tso, maxseg, 0);
+#ifdef KERN_TLS
+ if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) == 0)
+#endif
+ bbr_adjust_for_hw_pacing(bbr, cts);
+ return;
+ }
+ /**
+ * Now lets set the TSO goal based on our delivery rate in
+ * bytes per second. Note we only do this if
+ * we have acked at least the initial cwnd worth of data.
+ */
+ bw = bbr_get_bw(bbr);
+ if (IN_RECOVERY(bbr->rc_tp->t_flags) &&
+ (bbr->rc_use_google == 0)) {
+ /* We clamp to one MSS in recovery */
+ new_tso = maxseg;
+ } else if (bbr->rc_use_google) {
+ int min_tso_segs;
+
+ /* Google considers the gain too */
+ if (bbr->r_ctl.rc_bbr_hptsi_gain != BBR_UNIT) {
+ bw *= bbr->r_ctl.rc_bbr_hptsi_gain;
+ bw /= BBR_UNIT;
+ }
+ bytes = bw / 1024;
+ if (bytes > (64 * 1024))
+ bytes = 64 * 1024;
+ new_tso = bytes / maxseg;
+ if (bw < ONE_POINT_TWO_MEG)
+ min_tso_segs = 1;
+ else
+ min_tso_segs = 2;
+ if (new_tso < min_tso_segs)
+ new_tso = min_tso_segs;
+ new_tso *= maxseg;
+ } else if (bbr->rc_no_pacing) {
+ new_tso = (PACE_MAX_IP_BYTES / maxseg) * maxseg;
+ } else if (bw <= bbr->r_ctl.bbr_cross_over) {
+ /*
+ * Calculate the worse case b/w TSO if we are inserting no
+ * more than a delay_target number of TSO's.
+ */
+ uint32_t tso_len, min_tso;
+
+ tso_len = bbr_get_pacing_length(bbr, BBR_UNIT, bbr->r_ctl.bbr_hptsi_segments_delay_tar, bw);
+ if (tso_len > maxseg) {
+ new_tso = tso_len / maxseg;
+ if (new_tso > bbr->r_ctl.bbr_hptsi_segments_max)
+ new_tso = bbr->r_ctl.bbr_hptsi_segments_max;
+ new_tso *= maxseg;
+ } else {
+ /*
+ * less than a full sized frame yikes.. long rtt or
+ * low bw?
+ */
+ min_tso = bbr_minseg(bbr);
+ if ((tso_len > min_tso) && (bbr_all_get_min == 0))
+ new_tso = rounddown(tso_len, min_tso);
+ else
+ new_tso = min_tso;
+ }
+ } else if (bw > FIVETWELVE_MBPS) {
+ /*
+ * This guy is so fast b/w wise that we can TSO as large as
+ * possible of segments that the NIC will allow.
+ */
+ new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg);
+ } else {
+ /*
+ * This formula is based on attempting to send a segment or
+ * more every bbr_hptsi_per_second. The default is 1000
+ * which means you are targeting what you can send every 1ms
+ * based on the peers bw.
+ *
+ * If the number drops to say 500, then you are looking more
+ * at 2ms and you will raise how much we send in a single
+ * TSO thus saving CPU (less bbr_output_wtime() calls). The
+ * trade off of course is you will send more at once and
+ * thus tend to clump up the sends into larger "bursts"
+ * building a queue.
+ */
+ bw /= bbr->r_ctl.bbr_hptsi_per_second;
+ new_tso = roundup(bw, (uint64_t)maxseg);
+ /*
+ * Gate the floor to match what our lower than 48Mbps
+ * algorithm does. The ceiling (bbr_hptsi_segments_max) thus
+ * becomes the floor for this calculation.
+ */
+ if (new_tso < (bbr->r_ctl.bbr_hptsi_segments_max * maxseg))
+ new_tso = (bbr->r_ctl.bbr_hptsi_segments_max * maxseg);
+ }
+ if (bbr->r_ctl.bbr_hptsi_segments_floor && (new_tso < (maxseg * bbr->r_ctl.bbr_hptsi_segments_floor)))
+ new_tso = maxseg * bbr->r_ctl.bbr_hptsi_segments_floor;
+ if (new_tso > PACE_MAX_IP_BYTES)
+ new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg);
+ /* Enforce an utter maximum if we are not HW-TLS */
+#ifdef KERN_TLS
+ if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) == 0)
+#endif
+ if (bbr->r_ctl.bbr_utter_max && (new_tso > (bbr->r_ctl.bbr_utter_max * maxseg))) {
+ new_tso = bbr->r_ctl.bbr_utter_max * maxseg;
+ }
+#ifdef KERN_TLS
+ if (tls_seg) {
+ /*
+ * Lets move the output size
+ * up to 1 or more TLS record sizes.
+ */
+ uint32_t temp;
+
+ temp = roundup(new_tso, tls_seg);
+ new_tso = temp;
+ /* Back down if needed to under a full frame */
+ while (new_tso > PACE_MAX_IP_BYTES)
+ new_tso -= tls_seg;
+ }
+#endif
+ if (old_tso != new_tso) {
+ /* Only log changes */
+ bbr_log_type_tsosize(bbr, cts, new_tso, tls_seg, old_tso, maxseg, 0);
+ bbr->r_ctl.rc_pace_max_segs = new_tso;
+ }
+#ifdef KERN_TLS
+ if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) &&
+ tls_seg) {
+ bbr->r_ctl.rc_pace_min_segs = tls_seg + bbr->rc_last_options;
+ } else
+#endif
+ /* We have hardware pacing and not hardware TLS! */
+ bbr_adjust_for_hw_pacing(bbr, cts);
+}
+
+static void
+bbr_log_output(struct tcp_bbr *bbr, struct tcpcb *tp, struct tcpopt *to, int32_t len,
+ uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t cts,
+ struct mbuf *mb, int32_t * abandon, struct bbr_sendmap *hintrsm, uint32_t delay_calc,
+ struct sockbuf *sb)
+{
+
+ struct bbr_sendmap *rsm, *nrsm;
+ register uint32_t snd_max, snd_una;
+ uint32_t pacing_time;
+ /*
+ * Add to the RACK log of packets in flight or retransmitted. If
+ * there is a TS option we will use the TS echoed, if not we will
+ * grab a TS.
+ *
+ * Retransmissions will increment the count and move the ts to its
+ * proper place. Note that if options do not include TS's then we
+ * won't be able to effectively use the ACK for an RTT on a retran.
+ *
+ * Notes about r_start and r_end. Lets consider a send starting at
+ * sequence 1 for 10 bytes. In such an example the r_start would be
+ * 1 (starting sequence) but the r_end would be r_start+len i.e. 11.
+ * This means that r_end is actually the first sequence for the next
+ * slot (11).
+ *
+ */
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (err) {
+ /*
+ * We don't log errors -- we could but snd_max does not
+ * advance in this case either.
+ */
+ return;
+ }
+ if (th_flags & TH_RST) {
+ /*
+ * We don't log resets and we return immediately from
+ * sending
+ */
+ *abandon = 1;
+ return;
+ }
+ snd_una = tp->snd_una;
+ if (th_flags & (TH_SYN | TH_FIN) && (hintrsm == NULL)) {
+ /*
+ * The call to bbr_log_output is made before bumping
+ * snd_max. This means we can record one extra byte on a SYN
+ * or FIN if seq_out is adding more on and a FIN is present
+ * (and we are not resending).
+ */
+ if (th_flags & TH_SYN)
+ len++;
+ if (th_flags & TH_FIN)
+ len++;
+ }
+ if (SEQ_LEQ((seq_out + len), snd_una)) {
+ /* Are sending an old segment to induce an ack (keep-alive)? */
+ return;
+ }
+ if (SEQ_LT(seq_out, snd_una)) {
+ /* huh? should we panic? */
+ uint32_t end;
+
+ end = seq_out + len;
+ seq_out = snd_una;
+ len = end - seq_out;
+ }
+ snd_max = tp->snd_max;
+ if (len == 0) {
+ /* We don't log zero window probes */
+ return;
+ }
+ pacing_time = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, len, cts, 1);
+ /* First question is it a retransmission? */
+ if (seq_out == snd_max) {
+again:
+ rsm = bbr_alloc(bbr);
+ if (rsm == NULL) {
+ return;
+ }
+ rsm->r_flags = 0;
+ if (th_flags & TH_SYN)
+ rsm->r_flags |= BBR_HAS_SYN;
+ if (th_flags & TH_FIN)
+ rsm->r_flags |= BBR_HAS_FIN;
+ rsm->r_tim_lastsent[0] = cts;
+ rsm->r_rtr_cnt = 1;
+ rsm->r_rtr_bytes = 0;
+ rsm->r_start = seq_out;
+ rsm->r_end = rsm->r_start + len;
+ rsm->r_dupack = 0;
+ rsm->r_delivered = bbr->r_ctl.rc_delivered;
+ rsm->r_pacing_delay = pacing_time;
+ rsm->r_ts_valid = bbr->rc_ts_valid;
+ if (bbr->rc_ts_valid)
+ rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts;
+ rsm->r_del_time = bbr->r_ctl.rc_del_time;
+ if (bbr->r_ctl.r_app_limited_until)
+ rsm->r_app_limited = 1;
+ else
+ rsm->r_app_limited = 0;
+ rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts);
+ rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ /*
+ * Here we must also add in this rsm since snd_max
+ * is updated after we return from a new send.
+ */
+ rsm->r_flight_at_send += len;
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next);
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 1;
+ if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW)
+ rsm->r_bbr_state = bbr_state_val(bbr);
+ else
+ rsm->r_bbr_state = 8;
+ if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) {
+ rsm->r_is_gain = 1;
+ rsm->r_is_drain = 0;
+ } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) {
+ rsm->r_is_drain = 1;
+ rsm->r_is_gain = 0;
+ } else {
+ rsm->r_is_drain = 0;
+ rsm->r_is_gain = 0;
+ }
+ return;
+ }
+ /*
+ * If we reach here its a retransmission and we need to find it.
+ */
+more:
+ if (hintrsm && (hintrsm->r_start == seq_out)) {
+ rsm = hintrsm;
+ hintrsm = NULL;
+ } else if (bbr->r_ctl.rc_next) {
+ /* We have a hint from a previous run */
+ rsm = bbr->r_ctl.rc_next;
+ } else {
+ /* No hints sorry */
+ rsm = NULL;
+ }
+ if ((rsm) && (rsm->r_start == seq_out)) {
+ /*
+ * We used rc_next or hintrsm to retransmit, hopefully the
+ * likely case.
+ */
+ seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time);
+ if (len == 0) {
+ return;
+ } else {
+ goto more;
+ }
+ }
+ /* Ok it was not the last pointer go through it the hard way. */
+ TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) {
+ if (rsm->r_start == seq_out) {
+ seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time);
+ bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next);
+ if (len == 0) {
+ return;
+ } else {
+ continue;
+ }
+ }
+ if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) {
+ /* Transmitted within this piece */
+ /*
+ * Ok we must split off the front and then let the
+ * update do the rest
+ */
+ nrsm = bbr_alloc_full_limit(bbr);
+ if (nrsm == NULL) {
+ bbr_update_rsm(tp, bbr, rsm, cts, pacing_time);
+ return;
+ }
+ /*
+ * copy rsm to nrsm and then trim the front of rsm
+ * to not include this part.
+ */
+ bbr_clone_rsm(bbr, nrsm, rsm, seq_out);
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ rsm->r_flags &= (~BBR_HAS_FIN);
+ seq_out = bbr_update_entry(tp, bbr, nrsm, cts, &len, pacing_time);
+ if (len == 0) {
+ return;
+ }
+ }
+ }
+ /*
+ * Hmm not found in map did they retransmit both old and on into the
+ * new?
+ */
+ if (seq_out == tp->snd_max) {
+ goto again;
+ } else if (SEQ_LT(seq_out, tp->snd_max)) {
+#ifdef BBR_INVARIANTS
+ printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n",
+ seq_out, len, tp->snd_una, tp->snd_max);
+ printf("Starting Dump of all rack entries\n");
+ TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) {
+ printf("rsm:%p start:%u end:%u\n",
+ rsm, rsm->r_start, rsm->r_end);
+ }
+ printf("Dump complete\n");
+ panic("seq_out not found rack:%p tp:%p",
+ bbr, tp);
+#endif
+ } else {
+#ifdef BBR_INVARIANTS
+ /*
+ * Hmm beyond sndmax? (only if we are using the new rtt-pack
+ * flag)
+ */
+ panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p",
+ seq_out, len, tp->snd_max, tp);
+#endif
+ }
+}
+
+static void
+bbr_collapse_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, int32_t rtt)
+{
+ /*
+ * Collapse timeout back the cum-ack moved.
+ */
+ tp->t_rxtshift = 0;
+ tp->t_softerror = 0;
+}
+
+
+static void
+tcp_bbr_xmit_timer(struct tcp_bbr *bbr, uint32_t rtt_usecs, uint32_t rsm_send_time, uint32_t r_start, uint32_t tsin)
+{
+ bbr->rtt_valid = 1;
+ bbr->r_ctl.cur_rtt = rtt_usecs;
+ bbr->r_ctl.ts_in = tsin;
+ if (rsm_send_time)
+ bbr->r_ctl.cur_rtt_send_time = rsm_send_time;
+}
+
+static void
+bbr_make_timestamp_determination(struct tcp_bbr *bbr)
+{
+ /**
+ * We have in our bbr control:
+ * 1) The timestamp we started observing cum-acks (bbr->r_ctl.bbr_ts_check_tstmp).
+ * 2) Our timestamp indicating when we sent that packet (bbr->r_ctl.rsm->bbr_ts_check_our_cts).
+ * 3) The current timestamp that just came in (bbr->r_ctl.last_inbound_ts)
+ * 4) The time that the packet that generated that ack was sent (bbr->r_ctl.cur_rtt_send_time)
+ *
+ * Now we can calculate the time between the sends by doing:
+ *
+ * delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts
+ *
+ * And the peer's time between receiving them by doing:
+ *
+ * peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp
+ *
+ * We want to figure out if the timestamp values are in msec, 10msec or usec.
+ * We also may find that we can't use the timestamps if say we see
+ * that the peer_delta indicates that though we may have taken 10ms to
+ * pace out the data, it only saw 1ms between the two packets. This would
+ * indicate that somewhere on the path is a batching entity that is giving
+ * out time-slices of the actual b/w. This would mean we could not use
+ * reliably the peers timestamps.
+ *
+ * We expect delta > peer_delta initially. Until we figure out the
+ * timestamp difference which we will store in bbr->r_ctl.bbr_peer_tsratio.
+ * If we place 1000 there then its a ms vs our usec. If we place 10000 there
+ * then its 10ms vs our usec. If the peer is running a usec clock we would
+ * put a 1 there. If the value is faster then ours, we will disable the
+ * use of timestamps (though we could revist this later if we find it to be not
+ * just an isolated one or two flows)).
+ *
+ * To detect the batching middle boxes we will come up with our compensation and
+ * if with it in place, we find the peer is drastically off (by some margin) in
+ * the smaller direction, then we will assume the worst case and disable use of timestamps.
+ *
+ */
+ uint64_t delta, peer_delta, delta_up;
+
+ delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts;
+ if (delta < bbr_min_usec_delta) {
+ /*
+ * Have not seen a min amount of time
+ * between our send times so we can
+ * make a determination of the timestamp
+ * yet.
+ */
+ return;
+ }
+ peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp;
+ if (peer_delta < bbr_min_peer_delta) {
+ /*
+ * We may have enough in the form of
+ * our delta but the peers number
+ * has not changed that much. It could
+ * be its clock ratio is such that
+ * we need more data (10ms tick) or
+ * there may be other compression scenarios
+ * going on. In any event we need the
+ * spread to be larger.
+ */
+ return;
+ }
+ /* Ok lets first see which way our delta is going */
+ if (peer_delta > delta) {
+ /* Very unlikely, the peer without
+ * compensation shows that it saw
+ * the two sends arrive further apart
+ * then we saw then in micro-seconds.
+ */
+ if (peer_delta < (delta + ((delta * (uint64_t)1000)/ (uint64_t)bbr_delta_percent))) {
+ /* well it looks like the peer is a micro-second clock. */
+ bbr->rc_ts_clock_set = 1;
+ bbr->r_ctl.bbr_peer_tsratio = 1;
+ } else {
+ bbr->rc_ts_cant_be_used = 1;
+ bbr->rc_ts_clock_set = 1;
+ }
+ return;
+ }
+ /* Ok we know that the peer_delta is smaller than our send distance */
+ bbr->rc_ts_clock_set = 1;
+ /* First question is it within the percentage that they are using usec time? */
+ delta_up = (peer_delta * 1000) / (uint64_t)bbr_delta_percent;
+ if ((peer_delta + delta_up) >= delta) {
+ /* Its a usec clock */
+ bbr->r_ctl.bbr_peer_tsratio = 1;
+ bbr_log_tstmp_validation(bbr, peer_delta, delta);
+ return;
+ }
+ /* Ok if not usec, what about 10usec (though unlikely)? */
+ delta_up = (peer_delta * 1000 * 10) / (uint64_t)bbr_delta_percent;
+ if (((peer_delta * 10) + delta_up) >= delta) {
+ bbr->r_ctl.bbr_peer_tsratio = 10;
+ bbr_log_tstmp_validation(bbr, peer_delta, delta);
+ return;
+ }
+ /* And what about 100usec (though again unlikely)? */
+ delta_up = (peer_delta * 1000 * 100) / (uint64_t)bbr_delta_percent;
+ if (((peer_delta * 100) + delta_up) >= delta) {
+ bbr->r_ctl.bbr_peer_tsratio = 100;
+ bbr_log_tstmp_validation(bbr, peer_delta, delta);
+ return;
+ }
+ /* And how about 1 msec (the most likely one)? */
+ delta_up = (peer_delta * 1000 * 1000) / (uint64_t)bbr_delta_percent;
+ if (((peer_delta * 1000) + delta_up) >= delta) {
+ bbr->r_ctl.bbr_peer_tsratio = 1000;
+ bbr_log_tstmp_validation(bbr, peer_delta, delta);
+ return;
+ }
+ /* Ok if not msec could it be 10 msec? */
+ delta_up = (peer_delta * 1000 * 10000) / (uint64_t)bbr_delta_percent;
+ if (((peer_delta * 10000) + delta_up) >= delta) {
+ bbr->r_ctl.bbr_peer_tsratio = 10000;
+ return;
+ }
+ /* If we fall down here the clock tick so slowly we can't use it */
+ bbr->rc_ts_cant_be_used = 1;
+ bbr->r_ctl.bbr_peer_tsratio = 0;
+ bbr_log_tstmp_validation(bbr, peer_delta, delta);
+}
+
+/*
+ * Collect new round-trip time estimate
+ * and update averages and current timeout.
+ */
+static void
+tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts)
+{
+ int32_t delta;
+ uint32_t rtt, tsin;
+ int32_t rtt_ticks;
+
+
+ if (bbr->rtt_valid == 0)
+ /* No valid sample */
+ return;
+
+ rtt = bbr->r_ctl.cur_rtt;
+ tsin = bbr->r_ctl.ts_in;
+ if (bbr->rc_prtt_set_ts) {
+ /*
+ * We are to force feed the rttProp filter due
+ * to an entry into PROBE_RTT. This assures
+ * that the times are sync'd between when we
+ * go into PROBE_RTT and the filter expiration.
+ *
+ * Google does not use a true filter, so they do
+ * this implicitly since they only keep one value
+ * and when they enter probe-rtt they update the
+ * value to the newest rtt.
+ */
+ uint32_t rtt_prop;
+
+ bbr->rc_prtt_set_ts = 0;
+ rtt_prop = get_filter_value_small(&bbr->r_ctl.rc_rttprop);
+ if (rtt > rtt_prop)
+ filter_increase_by_small(&bbr->r_ctl.rc_rttprop, (rtt - rtt_prop), cts);
+ else
+ apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts);
+ }
+ if (bbr->rc_ack_was_delayed)
+ rtt += bbr->r_ctl.rc_ack_hdwr_delay;
+
+ if (rtt < bbr->r_ctl.rc_lowest_rtt)
+ bbr->r_ctl.rc_lowest_rtt = rtt;
+ bbr_log_rtt_sample(bbr, rtt, tsin);
+ if (bbr->r_init_rtt) {
+ /*
+ * The initial rtt is not-trusted, nuke it and lets get
+ * our first valid measurement in.
+ */
+ bbr->r_init_rtt = 0;
+ tp->t_srtt = 0;
+ }
+ if ((bbr->rc_ts_clock_set == 0) && bbr->rc_ts_valid) {
+ /*
+ * So we have not yet figured out
+ * what the peers TSTMP value is
+ * in (most likely ms). We need a
+ * series of cum-ack's to determine
+ * this reliably.
+ */
+ if (bbr->rc_ack_is_cumack) {
+ if (bbr->rc_ts_data_set) {
+ /* Lets attempt to determine the timestamp granularity. */
+ bbr_make_timestamp_determination(bbr);
+ } else {
+ bbr->rc_ts_data_set = 1;
+ bbr->r_ctl.bbr_ts_check_tstmp = bbr->r_ctl.last_inbound_ts;
+ bbr->r_ctl.bbr_ts_check_our_cts = bbr->r_ctl.cur_rtt_send_time;
+ }
+ } else {
+ /*
+ * We have to have consecutive acks
+ * reset any "filled" state to none.
+ */
+ bbr->rc_ts_data_set = 0;
+ }
+ }
+ /* Round it up */
+ rtt_ticks = USEC_2_TICKS((rtt + (USECS_IN_MSEC - 1)));
+ if (rtt_ticks == 0)
+ rtt_ticks = 1;
+ if (tp->t_srtt != 0) {
+ /*
+ * srtt is stored as fixed point with 5 bits after the
+ * binary point (i.e., scaled by 8). The following magic is
+ * equivalent to the smoothing algorithm in rfc793 with an
+ * alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed point).
+ * Adjust rtt to origin 0.
+ */
+
+ delta = ((rtt_ticks - 1) << TCP_DELTA_SHIFT)
+ - (tp->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT));
+
+ tp->t_srtt += delta;
+ if (tp->t_srtt <= 0)
+ tp->t_srtt = 1;
+
+ /*
+ * We accumulate a smoothed rtt variance (actually, a
+ * smoothed mean difference), then set the retransmit timer
+ * to smoothed rtt + 4 times the smoothed variance. rttvar
+ * is stored as fixed point with 4 bits after the binary
+ * point (scaled by 16). The following is equivalent to
+ * rfc793 smoothing with an alpha of .75 (rttvar =
+ * rttvar*3/4 + |delta| / 4). This replaces rfc793's
+ * wired-in beta.
+ */
+ if (delta < 0)
+ delta = -delta;
+ delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT);
+ tp->t_rttvar += delta;
+ if (tp->t_rttvar <= 0)
+ tp->t_rttvar = 1;
+ if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar)
+ tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
+ } else {
+ /*
+ * No rtt measurement yet - use the unsmoothed rtt. Set the
+ * variance to half the rtt (so our first retransmit happens
+ * at 3*rtt).
+ */
+ tp->t_srtt = rtt_ticks << TCP_RTT_SHIFT;
+ tp->t_rttvar = rtt_ticks << (TCP_RTTVAR_SHIFT - 1);
+ tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
+ }
+ TCPSTAT_INC(tcps_rttupdated);
+ tp->t_rttupdated++;
+#ifdef NETFLIX_STATS
+ stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt_ticks));
+#endif
+ /*
+ * the retransmit should happen at rtt + 4 * rttvar. Because of the
+ * way we do the smoothing, srtt and rttvar will each average +1/2
+ * tick of bias. When we compute the retransmit timer, we want 1/2
+ * tick of rounding and 1 extra tick because of +-1/2 tick
+ * uncertainty in the firing of the timer. The bias will give us
+ * exactly the 1.5 tick we need. But, because the bias is
+ * statistical, we have to test that we don't drop below the minimum
+ * feasible timer (which is 2 ticks).
+ */
+ TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp),
+ max(MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), rtt_ticks + 2),
+ MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000));
+
+ /*
+ * We received an ack for a packet that wasn't retransmitted; it is
+ * probably safe to discard any error indications we've received
+ * recently. This isn't quite right, but close enough for now (a
+ * route might have failed after we sent a segment, and the return
+ * path might not be symmetrical).
+ */
+ tp->t_softerror = 0;
+ rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT);
+ if (bbr->r_ctl.bbr_smallest_srtt_this_state > rtt)
+ bbr->r_ctl.bbr_smallest_srtt_this_state = rtt;
+}
+
+static void
+bbr_earlier_retran(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm,
+ uint32_t t, uint32_t cts, int ack_type)
+{
+ /*
+ * For this RSM, we acknowledged the data from a previous
+ * transmission, not the last one we made. This means we did a false
+ * retransmit.
+ */
+ if (rsm->r_flags & BBR_HAS_FIN) {
+ /*
+ * The sending of the FIN often is multiple sent when we
+ * have everything outstanding ack'd. We ignore this case
+ * since its over now.
+ */
+ return;
+ }
+ if (rsm->r_flags & BBR_TLP) {
+ /*
+ * We expect TLP's to have this occur often
+ */
+ bbr->rc_tlp_rtx_out = 0;
+ return;
+ }
+ if (ack_type != BBR_CUM_ACKED) {
+ /*
+ * If it was not a cum-ack we
+ * don't really know for sure since
+ * the timestamp could be from some
+ * other transmission.
+ */
+ return;
+ }
+
+ if (rsm->r_flags & BBR_WAS_SACKPASS) {
+ /*
+ * We retransmitted based on a sack and the earlier
+ * retransmission ack'd it - re-ordering is occuring.
+ */
+ BBR_STAT_INC(bbr_reorder_seen);
+ bbr->r_ctl.rc_reorder_ts = cts;
+ }
+ /* Back down the loss count */
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start;
+ bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start;
+ rsm->r_flags &= ~BBR_MARKED_LOST;
+ if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost))
+ /* LT sampling also needs adjustment */
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+ }
+ /***** RRS HERE ************************/
+ /* Do we need to do this??? */
+ /* bbr_reset_lt_bw_sampling(bbr, cts); */
+ /***** RRS HERE ************************/
+ BBR_STAT_INC(bbr_badfr);
+ BBR_STAT_ADD(bbr_badfr_bytes, (rsm->r_end - rsm->r_start));
+}
+
+
+static void
+bbr_set_reduced_rtt(struct tcp_bbr *bbr, uint32_t cts, uint32_t line)
+{
+ bbr->r_ctl.rc_rtt_shrinks = cts;
+ if (bbr_can_force_probertt &&
+ (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) &&
+ ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) {
+ /*
+ * We should enter probe-rtt its been too long
+ * since we have been there.
+ */
+ bbr_enter_probe_rtt(bbr, cts, __LINE__);
+ } else
+ bbr_check_probe_rtt_limits(bbr, cts);
+}
+
+static void
+tcp_bbr_commit_bw(struct tcp_bbr *bbr, uint32_t cts)
+{
+ uint64_t orig_bw;
+
+ if (bbr->r_ctl.rc_bbr_cur_del_rate == 0) {
+ /* We never apply a zero measurment */
+ bbr_log_type_bbrupd(bbr, 20, cts, 0, 0,
+ 0, 0, 0, 0, 0, 0);
+ return;
+ }
+ if (bbr->r_ctl.r_measurement_count < 0xffffffff)
+ bbr->r_ctl.r_measurement_count++;
+ orig_bw = get_filter_value(&bbr->r_ctl.rc_delrate);
+ apply_filter_max(&bbr->r_ctl.rc_delrate, bbr->r_ctl.rc_bbr_cur_del_rate, bbr->r_ctl.rc_pkt_epoch);
+ bbr_log_type_bbrupd(bbr, 21, cts, (uint32_t)orig_bw,
+ (uint32_t)get_filter_value(&bbr->r_ctl.rc_delrate),
+ 0, 0, 0, 0, 0, 0);
+ if (orig_bw &&
+ (orig_bw != get_filter_value(&bbr->r_ctl.rc_delrate))) {
+ if (bbr->bbr_hdrw_pacing) {
+ /*
+ * Apply a new rate to the hardware
+ * possibly.
+ */
+ bbr_update_hardware_pacing_rate(bbr, cts);
+ }
+ bbr_set_state_target(bbr, __LINE__);
+ tcp_bbr_tso_size_check(bbr, cts);
+ if (bbr->r_recovery_bw) {
+ bbr_setup_red_bw(bbr, cts);
+ bbr_log_type_bw_reduce(bbr, BBR_RED_BW_USELRBW);
+ }
+ } else if ((orig_bw == 0) && get_filter_value(&bbr->r_ctl.rc_delrate))
+ tcp_bbr_tso_size_check(bbr, cts);
+}
+
+static void
+bbr_nf_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts)
+{
+ if (bbr->rc_in_persist == 0) {
+ /* We log only when not in persist */
+ /* Translate to a Bytes Per Second */
+ uint64_t tim, bw, ts_diff, ts_bw;
+ uint32_t upper, lower, delivered;
+
+ if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time))
+ tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time);
+ else
+ tim = 1;
+ /*
+ * Now that we have processed the tim (skipping the sample
+ * or possibly updating the time, go ahead and
+ * calculate the cdr.
+ */
+ delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered);
+ bw = (uint64_t)delivered;
+ bw *= (uint64_t)USECS_IN_SECOND;
+ bw /= tim;
+ if (bw == 0) {
+ /* We must have a calculatable amount */
+ return;
+ }
+ upper = (bw >> 32) & 0x00000000ffffffff;
+ lower = bw & 0x00000000ffffffff;
+ /*
+ * If we are using this b/w shove it in now so we
+ * can see in the trace viewer if it gets over-ridden.
+ */
+ if (rsm->r_ts_valid &&
+ bbr->rc_ts_valid &&
+ bbr->rc_ts_clock_set &&
+ (bbr->rc_ts_cant_be_used == 0) &&
+ bbr->rc_use_ts_limit) {
+ ts_diff = max((bbr->r_ctl.last_inbound_ts - rsm->r_del_ack_ts), 1);
+ ts_diff *= bbr->r_ctl.bbr_peer_tsratio;
+ if ((delivered == 0) ||
+ (rtt < 1000)) {
+ /* Can't use the ts */
+ bbr_log_type_bbrupd(bbr, 61, cts,
+ ts_diff,
+ bbr->r_ctl.last_inbound_ts,
+ rsm->r_del_ack_ts, 0,
+ 0, 0, 0, delivered);
+ } else {
+ ts_bw = (uint64_t)delivered;
+ ts_bw *= (uint64_t)USECS_IN_SECOND;
+ ts_bw /= ts_diff;
+ bbr_log_type_bbrupd(bbr, 62, cts,
+ (ts_bw >> 32),
+ (ts_bw & 0xffffffff), 0, 0,
+ 0, 0, ts_diff, delivered);
+ if ((bbr->ts_can_raise) &&
+ (ts_bw > bw)) {
+ bbr_log_type_bbrupd(bbr, 8, cts,
+ delivered,
+ ts_diff,
+ (bw >> 32),
+ (bw & 0x00000000ffffffff),
+ 0, 0, 0, 0);
+ bw = ts_bw;
+ } else if (ts_bw && (ts_bw < bw)) {
+ bbr_log_type_bbrupd(bbr, 7, cts,
+ delivered,
+ ts_diff,
+ (bw >> 32),
+ (bw & 0x00000000ffffffff),
+ 0, 0, 0, 0);
+ bw = ts_bw;
+ }
+ }
+ }
+ if (rsm->r_first_sent_time &&
+ TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) {
+ uint64_t sbw, sti;
+ /*
+ * We use what was in flight at the time of our
+ * send and the size of this send to figure
+ * out what we have been sending at (amount).
+ * For the time we take from the time of
+ * the send of the first send outstanding
+ * until this send plus this sends pacing
+ * time. This gives us a good calculation
+ * as to the rate we have been sending at.
+ */
+
+ sbw = (uint64_t)(rsm->r_flight_at_send);
+ sbw *= (uint64_t)USECS_IN_SECOND;
+ sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time;
+ sti += rsm->r_pacing_delay;
+ sbw /= sti;
+ if (sbw < bw) {
+ bbr_log_type_bbrupd(bbr, 6, cts,
+ delivered,
+ (uint32_t)sti,
+ (bw >> 32),
+ (uint32_t)bw,
+ rsm->r_first_sent_time, 0, (sbw >> 32),
+ (uint32_t)sbw);
+ bw = sbw;
+ }
+ }
+ /* Use the google algorithm for b/w measurements */
+ bbr->r_ctl.rc_bbr_cur_del_rate = bw;
+ if ((rsm->r_app_limited == 0) ||
+ (bw > get_filter_value(&bbr->r_ctl.rc_delrate))) {
+ tcp_bbr_commit_bw(bbr, cts);
+ bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered,
+ 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time);
+ }
+ }
+}
+
+static void
+bbr_google_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts)
+{
+ if (bbr->rc_in_persist == 0) {
+ /* We log only when not in persist */
+ /* Translate to a Bytes Per Second */
+ uint64_t tim, bw;
+ uint32_t upper, lower, delivered;
+ int no_apply = 0;
+
+ if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time))
+ tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time);
+ else
+ tim = 1;
+ /*
+ * Now that we have processed the tim (skipping the sample
+ * or possibly updating the time, go ahead and
+ * calculate the cdr.
+ */
+ delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered);
+ bw = (uint64_t)delivered;
+ bw *= (uint64_t)USECS_IN_SECOND;
+ bw /= tim;
+ if (tim < bbr->r_ctl.rc_lowest_rtt) {
+ bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered,
+ tim, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0);
+
+ no_apply = 1;
+ }
+ upper = (bw >> 32) & 0x00000000ffffffff;
+ lower = bw & 0x00000000ffffffff;
+ /*
+ * If we are using this b/w shove it in now so we
+ * can see in the trace viewer if it gets over-ridden.
+ */
+ bbr->r_ctl.rc_bbr_cur_del_rate = bw;
+ /* Gate by the sending rate */
+ if (rsm->r_first_sent_time &&
+ TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) {
+ uint64_t sbw, sti;
+ /*
+ * We use what was in flight at the time of our
+ * send and the size of this send to figure
+ * out what we have been sending at (amount).
+ * For the time we take from the time of
+ * the send of the first send outstanding
+ * until this send plus this sends pacing
+ * time. This gives us a good calculation
+ * as to the rate we have been sending at.
+ */
+
+ sbw = (uint64_t)(rsm->r_flight_at_send);
+ sbw *= (uint64_t)USECS_IN_SECOND;
+ sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time;
+ sti += rsm->r_pacing_delay;
+ sbw /= sti;
+ if (sbw < bw) {
+ bbr_log_type_bbrupd(bbr, 6, cts,
+ delivered,
+ (uint32_t)sti,
+ (bw >> 32),
+ (uint32_t)bw,
+ rsm->r_first_sent_time, 0, (sbw >> 32),
+ (uint32_t)sbw);
+ bw = sbw;
+ }
+ if ((sti > tim) &&
+ (sti < bbr->r_ctl.rc_lowest_rtt)) {
+ bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered,
+ (uint32_t)sti, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0);
+ no_apply = 1;
+ } else
+ no_apply = 0;
+ }
+ bbr->r_ctl.rc_bbr_cur_del_rate = bw;
+ if ((no_apply == 0) &&
+ ((rsm->r_app_limited == 0) ||
+ (bw > get_filter_value(&bbr->r_ctl.rc_delrate)))) {
+ tcp_bbr_commit_bw(bbr, cts);
+ bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered,
+ 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time);
+ }
+ }
+}
+
+
+static void
+bbr_update_bbr_info(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts, uint32_t tsin,
+ uint32_t uts, int32_t match, uint32_t rsm_send_time, int32_t ack_type, struct tcpopt *to)
+{
+ uint64_t old_rttprop;
+
+ /* Update our delivery time and amount */
+ bbr->r_ctl.rc_delivered += (rsm->r_end - rsm->r_start);
+ bbr->r_ctl.rc_del_time = cts;
+ if (rtt == 0) {
+ /*
+ * 0 means its a retransmit, for now we don't use these for
+ * the rest of BBR.
+ */
+ return;
+ }
+ if ((bbr->rc_use_google == 0) &&
+ (match != BBR_RTT_BY_EXACTMATCH) &&
+ (match != BBR_RTT_BY_TIMESTAMP)){
+ /*
+ * We get a lot of rtt updates, lets not pay attention to
+ * any that are not an exact match. That way we don't have
+ * to worry about timestamps and the whole nonsense of
+ * unsure if its a retransmission etc (if we ever had the
+ * timestamp fixed to always have the last thing sent this
+ * would not be a issue).
+ */
+ return;
+ }
+ if ((bbr_no_retran && bbr->rc_use_google) &&
+ (match != BBR_RTT_BY_EXACTMATCH) &&
+ (match != BBR_RTT_BY_TIMESTAMP)){
+ /*
+ * We only do measurements in google mode
+ * with bbr_no_retran on for sure things.
+ */
+ return;
+ }
+ /* Only update srtt if we know by exact match */
+ tcp_bbr_xmit_timer(bbr, rtt, rsm_send_time, rsm->r_start, tsin);
+ if (ack_type == BBR_CUM_ACKED)
+ bbr->rc_ack_is_cumack = 1;
+ else
+ bbr->rc_ack_is_cumack = 0;
+ old_rttprop = bbr_get_rtt(bbr, BBR_RTT_PROP);
+ /*
+ * Note the following code differs to the original
+ * BBR spec. It calls for <= not <. However after a
+ * long discussion in email with Neal, he acknowledged
+ * that it should be < than so that we will have flows
+ * going into probe-rtt (we were seeing cases where that
+ * did not happen and caused ugly things to occur). We
+ * have added this agreed upon fix to our code base.
+ */
+ if (rtt < old_rttprop) {
+ /* Update when we last saw a rtt drop */
+ bbr_log_rtt_shrinks(bbr, cts, 0, rtt, __LINE__, BBR_RTTS_NEWRTT, 0);
+ bbr_set_reduced_rtt(bbr, cts, __LINE__);
+ }
+ bbr_log_type_bbrrttprop(bbr, rtt, (rsm ? rsm->r_end : 0), uts, cts,
+ match, rsm->r_start, rsm->r_flags);
+ apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts);
+ if (old_rttprop != bbr_get_rtt(bbr, BBR_RTT_PROP)) {
+ /*
+ * The RTT-prop moved, reset the target (may be a
+ * nop for some states).
+ */
+ bbr_set_state_target(bbr, __LINE__);
+ if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0,
+ __LINE__, BBR_RTTS_NEW_TARGET, 0);
+ else if (old_rttprop < bbr_get_rtt(bbr, BBR_RTT_PROP))
+ /* It went up */
+ bbr_check_probe_rtt_limits(bbr, cts);
+ }
+ if ((bbr->rc_use_google == 0) &&
+ (match == BBR_RTT_BY_TIMESTAMP)) {
+ /*
+ * We don't do b/w update with
+ * these since they are not really
+ * reliable.
+ */
+ return;
+ }
+ if (bbr->r_ctl.r_app_limited_until &&
+ (bbr->r_ctl.rc_delivered >= bbr->r_ctl.r_app_limited_until)) {
+ /* We are no longer app-limited */
+ bbr->r_ctl.r_app_limited_until = 0;
+ }
+ if (bbr->rc_use_google) {
+ bbr_google_measurement(bbr, rsm, rtt, cts);
+ } else {
+ bbr_nf_measurement(bbr, rsm, rtt, cts);
+ }
+}
+
+/*
+ * Convert a timestamp that the main stack
+ * uses (milliseconds) into one that bbr uses
+ * (microseconds). Return that converted timestamp.
+ */
+static uint32_t
+bbr_ts_convert(uint32_t cts) {
+ uint32_t sec, msec;
+
+ sec = cts / MS_IN_USEC;
+ msec = cts - (MS_IN_USEC * sec);
+ return ((sec * USECS_IN_SECOND) + (msec * MS_IN_USEC));
+}
+
+/*
+ * Return 0 if we did not update the RTT time, return
+ * 1 if we did.
+ */
+static int
+bbr_update_rtt(struct tcpcb *tp, struct tcp_bbr *bbr,
+ struct bbr_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, uint32_t th_ack)
+{
+ int32_t i;
+ uint32_t t, uts = 0;
+
+ if ((rsm->r_flags & BBR_ACKED) ||
+ (rsm->r_flags & BBR_WAS_RENEGED) ||
+ (rsm->r_flags & BBR_RXT_CLEARED)) {
+ /* Already done */
+ return (0);
+ }
+ if (rsm->r_rtr_cnt == 1) {
+ /*
+ * Only one transmit. Hopefully the normal case.
+ */
+ if (TSTMP_GT(cts, rsm->r_tim_lastsent[0]))
+ t = cts - rsm->r_tim_lastsent[0];
+ else
+ t = 1;
+ if ((int)t <= 0)
+ t = 1;
+ bbr->r_ctl.rc_last_rtt = t;
+ bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0,
+ BBR_RTT_BY_EXACTMATCH, rsm->r_tim_lastsent[0], ack_type, to);
+ return (1);
+ }
+ /* Convert to usecs */
+ if ((bbr_can_use_ts_for_rtt == 1) &&
+ (bbr->rc_use_google == 1) &&
+ (ack_type == BBR_CUM_ACKED) &&
+ (to->to_flags & TOF_TS) &&
+ (to->to_tsecr != 0)) {
+
+ t = tcp_tv_to_mssectick(&bbr->rc_tv) - to->to_tsecr;
+ if (t < 1)
+ t = 1;
+ t *= MS_IN_USEC;
+ bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0,
+ BBR_RTT_BY_TIMESTAMP,
+ rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)],
+ ack_type, to);
+ return (1);
+ }
+ uts = bbr_ts_convert(to->to_tsecr);
+ if ((to->to_flags & TOF_TS) &&
+ (to->to_tsecr != 0) &&
+ (ack_type == BBR_CUM_ACKED) &&
+ ((rsm->r_flags & BBR_OVERMAX) == 0)) {
+ /*
+ * Now which timestamp does it match? In this block the ACK
+ * may be coming from a previous transmission.
+ */
+ uint32_t fudge;
+
+ fudge = BBR_TIMER_FUDGE;
+ for (i = 0; i < rsm->r_rtr_cnt; i++) {
+ if ((SEQ_GEQ(uts, (rsm->r_tim_lastsent[i] - fudge))) &&
+ (SEQ_LEQ(uts, (rsm->r_tim_lastsent[i] + fudge)))) {
+ if (TSTMP_GT(cts, rsm->r_tim_lastsent[i]))
+ t = cts - rsm->r_tim_lastsent[i];
+ else
+ t = 1;
+ if ((int)t <= 0)
+ t = 1;
+ bbr->r_ctl.rc_last_rtt = t;
+ bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_TSMATCHING,
+ rsm->r_tim_lastsent[i], ack_type, to);
+ if ((i + 1) < rsm->r_rtr_cnt) {
+ /* Likely */
+ bbr_earlier_retran(tp, bbr, rsm, t, cts, ack_type);
+ } else if (rsm->r_flags & BBR_TLP) {
+ bbr->rc_tlp_rtx_out = 0;
+ }
+ return (1);
+ }
+ }
+ /* Fall through if we can't find a matching timestamp */
+ }
+ /*
+ * Ok its a SACK block that we retransmitted. or a windows
+ * machine without timestamps. We can tell nothing from the
+ * time-stamp since its not there or the time the peer last
+ * recieved a segment that moved forward its cum-ack point.
+ *
+ * Lets look at the last retransmit and see what we can tell
+ * (with BBR for space we only keep 2 note we have to keep
+ * at least 2 so the map can not be condensed more).
+ */
+ i = rsm->r_rtr_cnt - 1;
+ if (TSTMP_GT(cts, rsm->r_tim_lastsent[i]))
+ t = cts - rsm->r_tim_lastsent[i];
+ else
+ goto not_sure;
+ if (t < bbr->r_ctl.rc_lowest_rtt) {
+ /*
+ * We retransmitted and the ack came back in less
+ * than the smallest rtt we have observed in the
+ * windowed rtt. We most likey did an improper
+ * retransmit as outlined in 4.2 Step 3 point 2 in
+ * the rack-draft.
+ *
+ * Use the prior transmission to update all the
+ * information as long as there is only one prior
+ * transmission.
+ */
+ if ((rsm->r_flags & BBR_OVERMAX) == 0) {
+#ifdef BBR_INVARIANTS
+ if (rsm->r_rtr_cnt == 1)
+ panic("rsm:%p bbr:%p rsm has overmax and only 1 retranmit flags:%x?", rsm, bbr, rsm->r_flags);
+#endif
+ i = rsm->r_rtr_cnt - 2;
+ if (TSTMP_GT(cts, rsm->r_tim_lastsent[i]))
+ t = cts - rsm->r_tim_lastsent[i];
+ else
+ t = 1;
+ bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_EARLIER_RET,
+ rsm->r_tim_lastsent[i], ack_type, to);
+ bbr_earlier_retran(tp, bbr, rsm, t, cts, ack_type);
+ } else {
+ /*
+ * Too many prior transmissions, just
+ * updated BBR delivered
+ */
+not_sure:
+ bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts,
+ BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to);
+ }
+ } else {
+ /*
+ * We retransmitted it and the retransmit did the
+ * job.
+ */
+ if (rsm->r_flags & BBR_TLP)
+ bbr->rc_tlp_rtx_out = 0;
+ if ((rsm->r_flags & BBR_OVERMAX) == 0)
+ bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts,
+ BBR_RTT_BY_THIS_RETRAN, 0, ack_type, to);
+ else
+ bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts,
+ BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to);
+ return (1);
+ }
+ return (0);
+}
+
+/*
+ * Mark the SACK_PASSED flag on all entries prior to rsm send wise.
+ */
+static void
+bbr_log_sack_passed(struct tcpcb *tp,
+ struct tcp_bbr *bbr, struct bbr_sendmap *rsm)
+{
+ struct bbr_sendmap *nrsm;
+
+ nrsm = rsm;
+ TAILQ_FOREACH_REVERSE_FROM(nrsm, &bbr->r_ctl.rc_tmap,
+ bbr_head, r_tnext) {
+ if (nrsm == rsm) {
+ /* Skip orginal segment he is acked */
+ continue;
+ }
+ if (nrsm->r_flags & BBR_ACKED) {
+ /* Skip ack'd segments */
+ continue;
+ }
+ if (nrsm->r_flags & BBR_SACK_PASSED) {
+ /*
+ * We found one that is already marked
+ * passed, we have been here before and
+ * so all others below this are marked.
+ */
+ break;
+ }
+ BBR_STAT_INC(bbr_sack_passed);
+ nrsm->r_flags |= BBR_SACK_PASSED;
+ if (((nrsm->r_flags & BBR_MARKED_LOST) == 0) &&
+ bbr_is_lost(bbr, nrsm, bbr->r_ctl.rc_rcvtime)) {
+ bbr->r_ctl.rc_lost += nrsm->r_end - nrsm->r_start;
+ bbr->r_ctl.rc_lost_bytes += nrsm->r_end - nrsm->r_start;
+ nrsm->r_flags |= BBR_MARKED_LOST;
+ }
+ nrsm->r_flags &= ~BBR_WAS_SACKPASS;
+ }
+}
+
+/*
+ * Returns the number of bytes that were
+ * newly ack'd by sack blocks.
+ */
+static uint32_t
+bbr_proc_sack_blk(struct tcpcb *tp, struct tcp_bbr *bbr, struct sackblk *sack,
+ struct tcpopt *to, struct bbr_sendmap **prsm, uint32_t cts)
+{
+ int32_t times = 0;
+ uint32_t start, end, maxseg, changed = 0;
+ struct bbr_sendmap *rsm, *nrsm;
+ int32_t used_ref = 1;
+ uint8_t went_back = 0, went_fwd = 0;
+
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ start = sack->start;
+ end = sack->end;
+ rsm = *prsm;
+ if (rsm == NULL)
+ used_ref = 0;
+
+ /* Do we locate the block behind where we last were? */
+ if (rsm && SEQ_LT(start, rsm->r_start)) {
+ went_back = 1;
+ TAILQ_FOREACH_REVERSE_FROM(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) {
+ if (SEQ_GEQ(start, rsm->r_start) &&
+ SEQ_LT(start, rsm->r_end)) {
+ goto do_rest_ofb;
+ }
+ }
+ }
+start_at_beginning:
+ went_fwd = 1;
+ /*
+ * Ok lets locate the block where this guy is fwd from rsm (if its
+ * set)
+ */
+ TAILQ_FOREACH_FROM(rsm, &bbr->r_ctl.rc_map, r_next) {
+ if (SEQ_GEQ(start, rsm->r_start) &&
+ SEQ_LT(start, rsm->r_end)) {
+ break;
+ }
+ }
+do_rest_ofb:
+ if (rsm == NULL) {
+ /*
+ * This happens when we get duplicate sack blocks with the
+ * same end. For example SACK 4: 100 SACK 3: 100 The sort
+ * will not change there location so we would just start at
+ * the end of the first one and get lost.
+ */
+ if (tp->t_flags & TF_SENTFIN) {
+ /*
+ * Check to see if we have not logged the FIN that
+ * went out.
+ */
+ nrsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next);
+ if (nrsm && (nrsm->r_end + 1) == tp->snd_max) {
+ /*
+ * Ok we did not get the FIN logged.
+ */
+ nrsm->r_end++;
+ rsm = nrsm;
+ goto do_rest_ofb;
+ }
+ }
+ if (times == 1) {
+#ifdef BBR_INVARIANTS
+ panic("tp:%p bbr:%p sack:%p to:%p prsm:%p",
+ tp, bbr, sack, to, prsm);
+#else
+ goto out;
+#endif
+ }
+ times++;
+ BBR_STAT_INC(bbr_sack_proc_restart);
+ rsm = NULL;
+ goto start_at_beginning;
+ }
+ /* Ok we have an ACK for some piece of rsm */
+ if (rsm->r_start != start) {
+ /*
+ * Need to split this in two pieces the before and after.
+ */
+ if (bbr_sack_mergable(rsm, start, end))
+ nrsm = bbr_alloc_full_limit(bbr);
+ else
+ nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT);
+ if (nrsm == NULL) {
+ /* We could not allocate ignore the sack */
+ struct sackblk blk;
+
+ blk.start = start;
+ blk.end = end;
+ sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk);
+ goto out;
+ }
+ bbr_clone_rsm(bbr, nrsm, rsm, start);
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ rsm->r_flags &= (~BBR_HAS_FIN);
+ rsm = nrsm;
+ }
+ if (SEQ_GEQ(end, rsm->r_end)) {
+ /*
+ * The end of this block is either beyond this guy or right
+ * at this guy.
+ */
+ if ((rsm->r_flags & BBR_ACKED) == 0) {
+ bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0);
+ changed += (rsm->r_end - rsm->r_start);
+ bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
+ bbr_log_sack_passed(tp, bbr, rsm);
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start;
+ }
+ /* Is Reordering occuring? */
+ if (rsm->r_flags & BBR_SACK_PASSED) {
+ BBR_STAT_INC(bbr_reorder_seen);
+ bbr->r_ctl.rc_reorder_ts = cts;
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start;
+ if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost))
+ /* LT sampling also needs adjustment */
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+ }
+ }
+ rsm->r_flags |= BBR_ACKED;
+ rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST);
+ if (rsm->r_in_tmap) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 0;
+ }
+ }
+ bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED);
+ if (end == rsm->r_end) {
+ /* This block only - done */
+ goto out;
+ }
+ /* There is more not coverend by this rsm move on */
+ start = rsm->r_end;
+ nrsm = TAILQ_NEXT(rsm, r_next);
+ rsm = nrsm;
+ times = 0;
+ goto do_rest_ofb;
+ }
+ if (rsm->r_flags & BBR_ACKED) {
+ /* Been here done that */
+ goto out;
+ }
+ /* Ok we need to split off this one at the tail */
+ if (bbr_sack_mergable(rsm, start, end))
+ nrsm = bbr_alloc_full_limit(bbr);
+ else
+ nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT);
+ if (nrsm == NULL) {
+ /* failed XXXrrs what can we do but loose the sack info? */
+ struct sackblk blk;
+
+ blk.start = start;
+ blk.end = end;
+ sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk);
+ goto out;
+ }
+ /* Clone it */
+ bbr_clone_rsm(bbr, nrsm, rsm, end);
+ /* The sack block does not cover this guy fully */
+ rsm->r_flags &= (~BBR_HAS_FIN);
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ nrsm->r_dupack = 0;
+ bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0);
+ bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED);
+ changed += (rsm->r_end - rsm->r_start);
+ bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
+ bbr_log_sack_passed(tp, bbr, rsm);
+ /* Is Reordering occuring? */
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start;
+ }
+ if (rsm->r_flags & BBR_SACK_PASSED) {
+ BBR_STAT_INC(bbr_reorder_seen);
+ bbr->r_ctl.rc_reorder_ts = cts;
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start;
+ if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost))
+ /* LT sampling also needs adjustment */
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+ }
+ }
+ rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST);
+ rsm->r_flags |= BBR_ACKED;
+ if (rsm->r_in_tmap) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 0;
+ }
+out:
+ if (rsm && (rsm->r_flags & BBR_ACKED)) {
+ /*
+ * Now can we merge this newly acked
+ * block with either the previous or
+ * next block?
+ */
+ nrsm = TAILQ_NEXT(rsm, r_next);
+ if (nrsm &&
+ (nrsm->r_flags & BBR_ACKED)) {
+ /* yep this and next can be merged */
+ rsm = bbr_merge_rsm(bbr, rsm, nrsm);
+ }
+ /* Now what about the previous? */
+ nrsm = TAILQ_PREV(rsm, bbr_head, r_next);
+ if (nrsm &&
+ (nrsm->r_flags & BBR_ACKED)) {
+ /* yep the previous and this can be merged */
+ rsm = bbr_merge_rsm(bbr, nrsm, rsm);
+ }
+ }
+ if (used_ref == 0) {
+ BBR_STAT_INC(bbr_sack_proc_all);
+ } else {
+ BBR_STAT_INC(bbr_sack_proc_short);
+ }
+ if (went_fwd && went_back) {
+ BBR_STAT_INC(bbr_sack_search_both);
+ } else if (went_fwd) {
+ BBR_STAT_INC(bbr_sack_search_fwd);
+ } else if (went_back) {
+ BBR_STAT_INC(bbr_sack_search_back);
+ }
+ /* Save off where the next seq is */
+ if (rsm)
+ bbr->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next);
+ else
+ bbr->r_ctl.rc_sacklast = NULL;
+ *prsm = rsm;
+ return (changed);
+}
+
+
+static void inline
+bbr_peer_reneges(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, tcp_seq th_ack)
+{
+ struct bbr_sendmap *tmap;
+
+ BBR_STAT_INC(bbr_reneges_seen);
+ tmap = NULL;
+ while (rsm && (rsm->r_flags & BBR_ACKED)) {
+ /* Its no longer sacked, mark it so */
+ uint32_t oflags;
+ bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
+#ifdef BBR_INVARIANTS
+ if (rsm->r_in_tmap) {
+ panic("bbr:%p rsm:%p flags:0x%x in tmap?",
+ bbr, rsm, rsm->r_flags);
+ }
+#endif
+ oflags = rsm->r_flags;
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start;
+ bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start;
+ if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost))
+ /* LT sampling also needs adjustment */
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+ }
+ rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS | BBR_MARKED_LOST);
+ rsm->r_flags |= BBR_WAS_RENEGED;
+ rsm->r_flags |= BBR_RXT_CLEARED;
+ bbr_log_type_rsmclear(bbr, bbr->r_ctl.rc_rcvtime, rsm, oflags, __LINE__);
+ /* Rebuild it into our tmap */
+ if (tmap == NULL) {
+ TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ tmap = rsm;
+ } else {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, tmap, rsm, r_tnext);
+ tmap = rsm;
+ }
+ tmap->r_in_tmap = 1;
+ /*
+ * XXXrrs Delivered? Should we do anything here?
+ *
+ * Of course we don't on a rxt timeout so maybe its ok that
+ * we don't?
+ *
+ * For now lets not.
+ */
+ rsm = TAILQ_NEXT(rsm, r_next);
+ }
+ /*
+ * Now lets possibly clear the sack filter so we start recognizing
+ * sacks that cover this area.
+ */
+ sack_filter_clear(&bbr->r_ctl.bbr_sf, th_ack);
+}
+
+static void
+bbr_log_syn(struct tcpcb *tp, struct tcpopt *to)
+{
+ struct tcp_bbr *bbr;
+ struct bbr_sendmap *rsm;
+ uint32_t cts;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ cts = bbr->r_ctl.rc_rcvtime;
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ if (rsm && (rsm->r_flags & BBR_HAS_SYN)) {
+ if ((rsm->r_end - rsm->r_start) <= 1) {
+ /* Log out the SYN completely */
+ bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
+ rsm->r_rtr_bytes = 0;
+ TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 0;
+ }
+ if (bbr->r_ctl.rc_next == rsm) {
+ /* scoot along the marker */
+ bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ }
+ if (to != NULL)
+ bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, 0);
+ bbr_free(bbr, rsm);
+ } else {
+ /* There is more (Fast open)? strip out SYN. */
+ rsm->r_flags &= ~BBR_HAS_SYN;
+ rsm->r_start++;
+ }
+ }
+}
+
+/*
+ * Returns the number of bytes that were
+ * acknowledged by SACK blocks.
+ */
+
+static uint32_t
+bbr_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th,
+ uint32_t *prev_acked)
+{
+ uint32_t changed, last_seq, entered_recovery = 0;
+ struct tcp_bbr *bbr;
+ struct bbr_sendmap *rsm;
+ struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1];
+ register uint32_t th_ack;
+ int32_t i, j, k, new_sb, num_sack_blks = 0;
+ uint32_t cts, acked, ack_point, sack_changed = 0;
+ uint32_t p_maxseg, maxseg, p_acked = 0;
+
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (th->th_flags & TH_RST) {
+ /* We don't log resets */
+ return (0);
+ }
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ cts = bbr->r_ctl.rc_rcvtime;
+
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ changed = 0;
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ p_maxseg = min(bbr->r_ctl.rc_pace_max_segs, maxseg);
+ th_ack = th->th_ack;
+ if (SEQ_GT(th_ack, tp->snd_una)) {
+ acked = th_ack - tp->snd_una;
+ bbr_log_progress_event(bbr, tp, ticks, PROGRESS_UPDATE, __LINE__);
+ bbr->rc_tp->t_acktime = ticks;
+ } else
+ acked = 0;
+ if (SEQ_LEQ(th_ack, tp->snd_una)) {
+ /* Only sent here for sack processing */
+ goto proc_sack;
+ }
+ if (rsm && SEQ_GT(th_ack, rsm->r_start)) {
+ changed = th_ack - rsm->r_start;
+ } else if ((rsm == NULL) && ((th_ack - 1) == tp->iss)) {
+ /*
+ * For the SYN incoming case we will not have called
+ * tcp_output for the sending of the SYN, so there will be
+ * no map. All other cases should probably be a panic.
+ */
+ if ((to->to_flags & TOF_TS) && (to->to_tsecr != 0)) {
+ /*
+ * We have a timestamp that can be used to generate
+ * an initial RTT.
+ */
+ uint32_t ts, now, rtt;
+
+ ts = bbr_ts_convert(to->to_tsecr);
+ now = bbr_ts_convert(tcp_tv_to_mssectick(&bbr->rc_tv));
+ rtt = now - ts;
+ if (rtt < 1)
+ rtt = 1;
+ bbr_log_type_bbrrttprop(bbr, rtt,
+ tp->iss, 0, cts,
+ BBR_RTT_BY_TIMESTAMP, tp->iss, 0);
+ apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts);
+ changed = 1;
+ bbr->r_wanted_output = 1;
+ goto out;
+ }
+ goto proc_sack;
+ } else if (rsm == NULL) {
+ goto out;
+ }
+ if (changed) {
+ /*
+ * The ACK point is advancing to th_ack, we must drop off
+ * the packets in the rack log and calculate any eligble
+ * RTT's.
+ */
+ bbr->r_wanted_output = 1;
+more:
+ if (rsm == NULL) {
+
+ if (tp->t_flags & TF_SENTFIN) {
+ /* if we send a FIN we will not hav a map */
+ goto proc_sack;
+ }
+#ifdef BBR_INVARIANTS
+ panic("No rack map tp:%p for th:%p state:%d bbr:%p snd_una:%u snd_max:%u chg:%d\n",
+ tp,
+ th, tp->t_state, bbr,
+ tp->snd_una, tp->snd_max, changed);
+#endif
+ goto proc_sack;
+ }
+ }
+ if (SEQ_LT(th_ack, rsm->r_start)) {
+ /* Huh map is missing this */
+#ifdef BBR_INVARIANTS
+ printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d bbr:%p\n",
+ rsm->r_start,
+ th_ack, tp->t_state,
+ bbr->r_state, bbr);
+ panic("th-ack is bad bbr:%p tp:%p", bbr, tp);
+#endif
+ goto proc_sack;
+ } else if (th_ack == rsm->r_start) {
+ /* None here to ack */
+ goto proc_sack;
+ }
+ /*
+ * Clear the dup ack counter, it will
+ * either be freed or if there is some
+ * remaining we need to start it at zero.
+ */
+ rsm->r_dupack = 0;
+ /* Now do we consume the whole thing? */
+ if (SEQ_GEQ(th_ack, rsm->r_end)) {
+ /* Its all consumed. */
+ uint32_t left;
+
+ if (rsm->r_flags & BBR_ACKED) {
+ /*
+ * It was acked on the scoreboard -- remove it from
+ * total
+ */
+ p_acked += (rsm->r_end - rsm->r_start);
+ bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
+ if (bbr->r_ctl.rc_sacked == 0)
+ bbr->r_ctl.rc_sacklast = NULL;
+ } else {
+ bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, th_ack);
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start;
+ }
+ if (rsm->r_flags & BBR_SACK_PASSED) {
+ /*
+ * There are acked segments ACKED on the
+ * scoreboard further up. We are seeing
+ * reordering.
+ */
+ BBR_STAT_INC(bbr_reorder_seen);
+ bbr->r_ctl.rc_reorder_ts = cts;
+ if (rsm->r_flags & BBR_MARKED_LOST) {
+ bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start;
+ if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost))
+ /* LT sampling also needs adjustment */
+ bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost;
+ }
+ }
+ rsm->r_flags &= ~BBR_MARKED_LOST;
+ }
+ bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
+ rsm->r_rtr_bytes = 0;
+ TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 0;
+ }
+ if (bbr->r_ctl.rc_next == rsm) {
+ /* scoot along the marker */
+ bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ }
+ bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED);
+ /* Adjust the packet counts */
+ left = th_ack - rsm->r_end;
+ /* Free back to zone */
+ bbr_free(bbr, rsm);
+ if (left) {
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ goto more;
+ }
+ goto proc_sack;
+ }
+ if (rsm->r_flags & BBR_ACKED) {
+ /*
+ * It was acked on the scoreboard -- remove it from total
+ * for the part being cum-acked.
+ */
+ p_acked += (rsm->r_end - rsm->r_start);
+ bbr->r_ctl.rc_sacked -= (th_ack - rsm->r_start);
+ if (bbr->r_ctl.rc_sacked == 0)
+ bbr->r_ctl.rc_sacklast = NULL;
+ } else {
+ /*
+ * It was acked up to th_ack point for the first time
+ */
+ struct bbr_sendmap lrsm;
+
+ memcpy(&lrsm, rsm, sizeof(struct bbr_sendmap));
+ lrsm.r_end = th_ack;
+ bbr_update_rtt(tp, bbr, &lrsm, to, cts, BBR_CUM_ACKED, th_ack);
+ }
+ if ((rsm->r_flags & BBR_MARKED_LOST) &&
+ ((rsm->r_flags & BBR_ACKED) == 0)) {
+ /*
+ * It was marked lost and partly ack'd now
+ * for the first time. We lower the rc_lost_bytes
+ * and still leave it MARKED.
+ */
+ bbr->r_ctl.rc_lost_bytes -= th_ack - rsm->r_start;
+ }
+ bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED);
+ bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
+ rsm->r_rtr_bytes = 0;
+ /* adjust packet count */
+ rsm->r_start = th_ack;
+proc_sack:
+ /* Check for reneging */
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ if (rsm && (rsm->r_flags & BBR_ACKED) && (th_ack == rsm->r_start)) {
+ /*
+ * The peer has moved snd_una up to the edge of this send,
+ * i.e. one that it had previously acked. The only way that
+ * can be true if the peer threw away data (space issues)
+ * that it had previously sacked (else it would have given
+ * us snd_una up to (rsm->r_end). We need to undo the acked
+ * markings here.
+ *
+ * Note we have to look to make sure th_ack is our
+ * rsm->r_start in case we get an old ack where th_ack is
+ * behind snd_una.
+ */
+ bbr_peer_reneges(bbr, rsm, th->th_ack);
+ }
+ if ((to->to_flags & TOF_SACK) == 0) {
+ /* We are done nothing left to log */
+ goto out;
+ }
+ rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next);
+ if (rsm) {
+ last_seq = rsm->r_end;
+ } else {
+ last_seq = tp->snd_max;
+ }
+ /* Sack block processing */
+ if (SEQ_GT(th_ack, tp->snd_una))
+ ack_point = th_ack;
+ else
+ ack_point = tp->snd_una;
+ for (i = 0; i < to->to_nsacks; i++) {
+ bcopy((to->to_sacks + i * TCPOLEN_SACK),
+ &sack, sizeof(sack));
+ sack.start = ntohl(sack.start);
+ sack.end = ntohl(sack.end);
+ if (SEQ_GT(sack.end, sack.start) &&
+ SEQ_GT(sack.start, ack_point) &&
+ SEQ_LT(sack.start, tp->snd_max) &&
+ SEQ_GT(sack.end, ack_point) &&
+ SEQ_LEQ(sack.end, tp->snd_max)) {
+ if ((bbr->r_ctl.rc_num_small_maps_alloced > bbr_sack_block_limit) &&
+ (SEQ_LT(sack.end, last_seq)) &&
+ ((sack.end - sack.start) < (p_maxseg / 8))) {
+ /*
+ * Not the last piece and its smaller than
+ * 1/8th of a p_maxseg. We ignore this.
+ */
+ BBR_STAT_INC(bbr_runt_sacks);
+ continue;
+ }
+ sack_blocks[num_sack_blks] = sack;
+ num_sack_blks++;
+#ifdef NETFLIX_STATS
+ } else if (SEQ_LEQ(sack.start, th_ack) &&
+ SEQ_LEQ(sack.end, th_ack)) {
+ /*
+ * Its a D-SACK block.
+ */
+ tcp_record_dsack(sack.start, sack.end);
+#endif
+ }
+ }
+ if (num_sack_blks == 0)
+ goto out;
+ /*
+ * Sort the SACK blocks so we can update the rack scoreboard with
+ * just one pass.
+ */
+ new_sb = sack_filter_blks(&bbr->r_ctl.bbr_sf, sack_blocks,
+ num_sack_blks, th->th_ack);
+ ctf_log_sack_filter(bbr->rc_tp, new_sb, sack_blocks);
+ BBR_STAT_ADD(bbr_sack_blocks, num_sack_blks);
+ BBR_STAT_ADD(bbr_sack_blocks_skip, (num_sack_blks - new_sb));
+ num_sack_blks = new_sb;
+ if (num_sack_blks < 2) {
+ goto do_sack_work;
+ }
+ /* Sort the sacks */
+ for (i = 0; i < num_sack_blks; i++) {
+ for (j = i + 1; j < num_sack_blks; j++) {
+ if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) {
+ sack = sack_blocks[i];
+ sack_blocks[i] = sack_blocks[j];
+ sack_blocks[j] = sack;
+ }
+ }
+ }
+ /*
+ * Now are any of the sack block ends the same (yes some
+ * implememtations send these)?
+ */
+again:
+ if (num_sack_blks > 1) {
+ for (i = 0; i < num_sack_blks; i++) {
+ for (j = i + 1; j < num_sack_blks; j++) {
+ if (sack_blocks[i].end == sack_blocks[j].end) {
+ /*
+ * Ok these two have the same end we
+ * want the smallest end and then
+ * throw away the larger and start
+ * again.
+ */
+ if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) {
+ /*
+ * The second block covers
+ * more area use that
+ */
+ sack_blocks[i].start = sack_blocks[j].start;
+ }
+ /*
+ * Now collapse out the dup-sack and
+ * lower the count
+ */
+ for (k = (j + 1); k < num_sack_blks; k++) {
+ sack_blocks[j].start = sack_blocks[k].start;
+ sack_blocks[j].end = sack_blocks[k].end;
+ j++;
+ }
+ num_sack_blks--;
+ goto again;
+ }
+ }
+ }
+ }
+do_sack_work:
+ rsm = bbr->r_ctl.rc_sacklast;
+ for (i = 0; i < num_sack_blks; i++) {
+ acked = bbr_proc_sack_blk(tp, bbr, &sack_blocks[i], to, &rsm, cts);
+ if (acked) {
+ bbr->r_wanted_output = 1;
+ changed += acked;
+ sack_changed += acked;
+ }
+ }
+out:
+ *prev_acked = p_acked;
+ if ((sack_changed) && (!IN_RECOVERY(tp->t_flags))) {
+ /*
+ * Ok we have a high probability that we need to go in to
+ * recovery since we have data sack'd
+ */
+ struct bbr_sendmap *rsm;
+
+ rsm = bbr_check_recovery_mode(tp, bbr, cts);
+ if (rsm) {
+ /* Enter recovery */
+ entered_recovery = 1;
+ bbr->r_wanted_output = 1;
+ /*
+ * When we enter recovery we need to assure we send
+ * one packet.
+ */
+ if (bbr->r_ctl.rc_resend == NULL) {
+ bbr->r_ctl.rc_resend = rsm;
+ }
+ }
+ }
+ if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) {
+ /*
+ * See if we need to rack-retransmit anything if so set it
+ * up as the thing to resend assuming something else is not
+ * already in that position.
+ */
+ if (bbr->r_ctl.rc_resend == NULL) {
+ bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts);
+ }
+ }
+ /*
+ * We return the amount that changed via sack, this is used by the
+ * ack-received code to augment what was changed between th_ack <->
+ * snd_una.
+ */
+ return (sack_changed);
+}
+
+static void
+bbr_strike_dupack(struct tcp_bbr *bbr)
+{
+ struct bbr_sendmap *rsm;
+
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap);
+ if (rsm && (rsm->r_dupack < 0xff)) {
+ rsm->r_dupack++;
+ if (rsm->r_dupack >= DUP_ACK_THRESHOLD)
+ bbr->r_wanted_output = 1;
+ }
+}
+
+/*
+ * Return value of 1, we do not need to call bbr_process_data().
+ * return value of 0, bbr_process_data can be called.
+ * For ret_val if its 0 the TCB is locked and valid, if its non-zero
+ * its unlocked and probably unsafe to touch the TCB.
+ */
+static int
+bbr_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to,
+ uint32_t tiwin, int32_t tlen,
+ int32_t * ofia, int32_t thflags, int32_t * ret_val)
+{
+ int32_t ourfinisacked = 0;
+ int32_t acked_amount;
+ uint16_t nsegs;
+ int32_t acked;
+ uint32_t lost, sack_changed = 0;
+ struct mbuf *mfree;
+ struct tcp_bbr *bbr;
+ uint32_t prev_acked = 0;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ lost = bbr->r_ctl.rc_lost;
+ nsegs = max(1, m->m_pkthdr.lro_nsegs);
+ if (SEQ_GT(th->th_ack, tp->snd_max)) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
+ bbr->r_wanted_output = 1;
+ return (1);
+ }
+ if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) {
+ /* Process the ack */
+ if (bbr->rc_in_persist)
+ tp->t_rxtshift = 0;
+ if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd))
+ bbr_strike_dupack(bbr);
+ sack_changed = bbr_log_ack(tp, to, th, &prev_acked);
+ }
+ bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, (bbr->r_ctl.rc_lost > lost));
+ if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
+ /*
+ * Old ack, behind the last one rcv'd or a duplicate ack
+ * with SACK info.
+ */
+ if (th->th_ack == tp->snd_una) {
+ bbr_ack_received(tp, bbr, th, 0, sack_changed, prev_acked, __LINE__, 0);
+ if (bbr->r_state == TCPS_SYN_SENT) {
+ /*
+ * Special case on where we sent SYN. When
+ * the SYN-ACK is processed in syn_sent
+ * state it bumps the snd_una. This causes
+ * us to hit here even though we did ack 1
+ * byte.
+ *
+ * Go through the nothing left case so we
+ * send data.
+ */
+ goto nothing_left;
+ }
+ }
+ return (0);
+ }
+ /*
+ * If we reach this point, ACK is not a duplicate, i.e., it ACKs
+ * something we sent.
+ */
+ if (tp->t_flags & TF_NEEDSYN) {
+ /*
+ * T/TCP: Connection was half-synchronized, and our SYN has
+ * been ACK'd (so connection is now fully synchronized). Go
+ * to non-starred state, increment snd_una for ACK of SYN,
+ * and check if we can do window scaling.
+ */
+ tp->t_flags &= ~TF_NEEDSYN;
+ tp->snd_una++;
+ /* Do window scaling? */
+ if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
+ (TF_RCVD_SCALE | TF_REQ_SCALE)) {
+ tp->rcv_scale = tp->request_r_scale;
+ /* Send window already scaled. */
+ }
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+
+ acked = BYTES_THIS_ACK(tp, th);
+ TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs);
+ TCPSTAT_ADD(tcps_rcvackbyte, acked);
+
+ /*
+ * If we just performed our first retransmit, and the ACK arrives
+ * within our recovery window, then it was a mistake to do the
+ * retransmit in the first place. Recover our original cwnd and
+ * ssthresh, and proceed to transmit where we left off.
+ */
+ if (tp->t_flags & TF_PREVVALID) {
+ tp->t_flags &= ~TF_PREVVALID;
+ if (tp->t_rxtshift == 1 &&
+ (int)(ticks - tp->t_badrxtwin) < 0)
+ bbr_cong_signal(tp, th, CC_RTO_ERR, NULL);
+ }
+ SOCKBUF_LOCK(&so->so_snd);
+ acked_amount = min(acked, (int)sbavail(&so->so_snd));
+ tp->snd_wnd -= acked_amount;
+ mfree = sbcut_locked(&so->so_snd, acked_amount);
+ /* NB: sowwakeup_locked() does an implicit unlock. */
+ sowwakeup_locked(so);
+ m_freem(mfree);
+ if (SEQ_GT(th->th_ack, tp->snd_una)) {
+ bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp));
+ }
+ tp->snd_una = th->th_ack;
+ bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, (bbr->r_ctl.rc_lost - lost));
+ if (IN_RECOVERY(tp->t_flags)) {
+ if (SEQ_LT(th->th_ack, tp->snd_recover) &&
+ (SEQ_LT(th->th_ack, tp->snd_max))) {
+ tcp_bbr_partialack(tp);
+ } else {
+ bbr_post_recovery(tp);
+ }
+ }
+ if (SEQ_GT(tp->snd_una, tp->snd_recover)) {
+ tp->snd_recover = tp->snd_una;
+ }
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ tp->snd_nxt = tp->snd_max;
+ }
+ if (tp->snd_una == tp->snd_max) {
+ /* Nothing left outstanding */
+nothing_left:
+ bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__);
+ if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0)
+ bbr->rc_tp->t_acktime = 0;
+ if ((sbused(&so->so_snd) == 0) &&
+ (tp->t_flags & TF_SENTFIN)) {
+ ourfinisacked = 1;
+ }
+ bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime);
+ if (bbr->rc_in_persist == 0) {
+ bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime;
+ }
+ sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
+ bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime);
+ /*
+ * We invalidate the last ack here since we
+ * don't want to transfer forward the time
+ * for our sum's calculations.
+ */
+ if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
+ (sbavail(&so->so_snd) == 0) &&
+ (tp->t_flags2 & TF2_DROP_AF_DATA)) {
+ /*
+ * The socket was gone and the peer sent data, time
+ * to reset him.
+ */
+ *ret_val = 1;
+ tp = tcp_close(tp);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen);
+ BBR_STAT_INC(bbr_dropped_af_data);
+ return (1);
+ }
+ /* Set need output so persist might get set */
+ bbr->r_wanted_output = 1;
+ }
+ if (ofia)
+ *ofia = ourfinisacked;
+ return (0);
+}
+
+static void
+bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line)
+{
+ if (bbr->rc_in_persist == 0) {
+ bbr_timer_cancel(bbr, __LINE__, cts);
+ bbr->r_ctl.rc_last_delay_val = 0;
+ tp->t_rxtshift = 0;
+ bbr->rc_in_persist = 1;
+ bbr->r_ctl.rc_went_idle_time = cts;
+ /* We should be capped when rw went to 0 but just in case */
+ bbr_log_type_pesist(bbr, cts, 0, line, 1);
+ /* Time freezes for the state, so do the accounting now */
+ if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+ uint32_t time_in;
+
+ time_in = cts - bbr->r_ctl.rc_bbr_state_time;
+ if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) {
+ int32_t idx;
+
+ idx = bbr_state_val(bbr);
+ counter_u64_add(bbr_state_time[(idx + 5)], time_in);
+ } else {
+ counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in);
+ }
+ }
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ }
+}
+
+static void
+bbr_restart_after_idle(struct tcp_bbr *bbr, uint32_t cts, uint32_t idle_time)
+{
+ /*
+ * Note that if idle time does not exceed our
+ * threshold, we do nothing continuing the state
+ * transitions we were last walking through.
+ */
+ if (idle_time >= bbr_idle_restart_threshold) {
+ if (bbr->rc_use_idle_restart) {
+ bbr->rc_bbr_state = BBR_STATE_IDLE_EXIT;
+ /*
+ * Set our target using BBR_UNIT, so
+ * we increase at a dramatic rate but
+ * we stop when we get the pipe
+ * full again for our current b/w estimate.
+ */
+ bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT;
+ bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT;
+ bbr_set_state_target(bbr, __LINE__);
+ /* Now setup our gains to ramp up */
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg;
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg;
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ } else {
+ bbr_substate_change(bbr, cts, __LINE__, 1);
+ }
+ }
+}
+
+static void
+bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line)
+{
+ uint32_t idle_time;
+
+ if (bbr->rc_in_persist == 0)
+ return;
+ idle_time = bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time);
+ bbr->rc_in_persist = 0;
+ bbr->rc_hit_state_1 = 0;
+ tp->t_flags &= ~TF_FORCEDATA;
+ bbr->r_ctl.rc_del_time = cts;
+ /*
+ * We invalidate the last ack here since we
+ * don't want to transfer forward the time
+ * for our sum's calculations.
+ */
+ if (bbr->rc_inp->inp_in_hpts) {
+ tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT);
+ bbr->rc_timer_first = 0;
+ bbr->r_ctl.rc_hpts_flags = 0;
+ bbr->r_ctl.rc_last_delay_val = 0;
+ bbr->r_ctl.rc_hptsi_agg_delay = 0;
+ bbr->r_agg_early_set = 0;
+ bbr->r_ctl.rc_agg_early = 0;
+ }
+ bbr_log_type_pesist(bbr, cts, idle_time, line, 0);
+ if (idle_time >= bbr_rtt_probe_time) {
+ /*
+ * This qualifies as a RTT_PROBE session since we drop the
+ * data outstanding to nothing and waited more than
+ * bbr_rtt_probe_time.
+ */
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_PERSIST, 0);
+ bbr->r_ctl.last_in_probertt = bbr->r_ctl.rc_rtt_shrinks = cts;
+ }
+ tp->t_rxtshift = 0;
+ /*
+ * If in probeBW and we have persisted more than an RTT lets do
+ * special handling.
+ */
+ /* Force a time based epoch */
+ bbr_set_epoch(bbr, cts, __LINE__);
+ /*
+ * Setup the lost so we don't count anything against the guy
+ * we have been stuck with during persists.
+ */
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ /* Time un-freezes for the state */
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) ||
+ (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)) {
+ /*
+ * If we are going back to probe-bw
+ * or probe_rtt, we may need to possibly
+ * do a fast restart.
+ */
+ bbr_restart_after_idle(bbr, cts, idle_time);
+ }
+}
+
+static void
+bbr_collapsed_window(struct tcp_bbr *bbr)
+{
+ /*
+ * Now we must walk the
+ * send map and divide the
+ * ones left stranded. These
+ * guys can't cause us to abort
+ * the connection and are really
+ * "unsent". However if a buggy
+ * client actually did keep some
+ * of the data i.e. collapsed the win
+ * and refused to ack and then opened
+ * the win and acked that data. We would
+ * get into an ack war, the simplier
+ * method then of just pretending we
+ * did not send those segments something
+ * won't work.
+ */
+ struct bbr_sendmap *rsm, *nrsm;
+ tcp_seq max_seq;
+ uint32_t maxseg;
+ int can_split = 0;
+ int fnd = 0;
+
+ maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options;
+ max_seq = bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd;
+ bbr_log_type_rwnd_collapse(bbr, max_seq, 1, 0);
+ TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) {
+ /* Find the first seq past or at maxseq */
+ if (rsm->r_flags & BBR_RWND_COLLAPSED)
+ rsm->r_flags &= ~BBR_RWND_COLLAPSED;
+ if (SEQ_GEQ(max_seq, rsm->r_start) &&
+ SEQ_GEQ(rsm->r_end, max_seq)) {
+ fnd = 1;
+ break;
+ }
+ }
+ bbr->rc_has_collapsed = 0;
+ if (!fnd) {
+ /* Nothing to do strange */
+ return;
+ }
+ /*
+ * Now can we split?
+ *
+ * We don't want to split if splitting
+ * would generate too many small segments
+ * less we let an attacker fragment our
+ * send_map and leave us out of memory.
+ */
+ if ((max_seq != rsm->r_start) &&
+ (max_seq != rsm->r_end)){
+ /* can we split? */
+ int res1, res2;
+
+ res1 = max_seq - rsm->r_start;
+ res2 = rsm->r_end - max_seq;
+ if ((res1 >= (maxseg/8)) &&
+ (res2 >= (maxseg/8))) {
+ /* No small pieces here */
+ can_split = 1;
+ } else if (bbr->r_ctl.rc_num_small_maps_alloced < bbr_sack_block_limit) {
+ /* We are under the limit */
+ can_split = 1;
+ }
+ }
+ /* Ok do we need to split this rsm? */
+ if (max_seq == rsm->r_start) {
+ /* It's this guy no split required */
+ nrsm = rsm;
+ } else if (max_seq == rsm->r_end) {
+ /* It's the next one no split required. */
+ nrsm = TAILQ_NEXT(rsm, r_next);
+ if (nrsm == NULL) {
+ /* Huh? */
+ return;
+ }
+ } else if (can_split && SEQ_LT(max_seq, rsm->r_end)) {
+ /* yep we need to split it */
+ nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT);
+ if (nrsm == NULL) {
+ /* failed XXXrrs what can we do mark the whole? */
+ nrsm = rsm;
+ goto no_split;
+ }
+ /* Clone it */
+ bbr_log_type_rwnd_collapse(bbr, max_seq, 3, 0);
+ bbr_clone_rsm(bbr, nrsm, rsm, max_seq);
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next);
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ } else {
+ /*
+ * Split not allowed just start here just
+ * use this guy.
+ */
+ nrsm = rsm;
+ }
+no_split:
+ BBR_STAT_INC(bbr_collapsed_win);
+ /* reuse fnd as a count */
+ fnd = 0;
+ TAILQ_FOREACH_FROM(nrsm, &bbr->r_ctl.rc_map, r_next) {
+ nrsm->r_flags |= BBR_RWND_COLLAPSED;
+ fnd++;
+ bbr->rc_has_collapsed = 1;
+ }
+ bbr_log_type_rwnd_collapse(bbr, max_seq, 4, fnd);
+}
+
+static void
+bbr_un_collapse_window(struct tcp_bbr *bbr)
+{
+ struct bbr_sendmap *rsm;
+ int cleared = 0;
+
+ TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) {
+ if (rsm->r_flags & BBR_RWND_COLLAPSED) {
+ /* Clear the flag */
+ rsm->r_flags &= ~BBR_RWND_COLLAPSED;
+ cleared++;
+ } else
+ break;
+ }
+ bbr_log_type_rwnd_collapse(bbr,
+ (bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd), 0, cleared);
+ bbr->rc_has_collapsed = 0;
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ /*
+ * Update window information. Don't look at window if no ACK: TAC's
+ * send garbage on first SYN.
+ */
+ uint16_t nsegs;
+ int32_t tfo_syn;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ nsegs = max(1, m->m_pkthdr.lro_nsegs);
+ if ((thflags & TH_ACK) &&
+ (SEQ_LT(tp->snd_wl1, th->th_seq) ||
+ (tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) ||
+ (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) {
+ /* keep track of pure window updates */
+ if (tlen == 0 &&
+ tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd)
+ TCPSTAT_INC(tcps_rcvwinupd);
+ tp->snd_wnd = tiwin;
+ tp->snd_wl1 = th->th_seq;
+ tp->snd_wl2 = th->th_ack;
+ if (tp->snd_wnd > tp->max_sndwnd)
+ tp->max_sndwnd = tp->snd_wnd;
+ bbr->r_wanted_output = 1;
+ } else if (thflags & TH_ACK) {
+ if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) {
+ tp->snd_wnd = tiwin;
+ tp->snd_wl1 = th->th_seq;
+ tp->snd_wl2 = th->th_ack;
+ }
+ }
+ if (tp->snd_wnd < ctf_outstanding(tp))
+ /* The peer collapsed its window on us */
+ bbr_collapsed_window(bbr);
+ else if (bbr->rc_has_collapsed)
+ bbr_un_collapse_window(bbr);
+ /* Was persist timer active and now we have window space? */
+ if ((bbr->rc_in_persist != 0) &&
+ (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2),
+ bbr_minseg(bbr)))) {
+ /*
+ * Make the rate persist at end of persist mode if idle long
+ * enough
+ */
+ bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__);
+
+ /* Make sure we output to start the timer */
+ bbr->r_wanted_output = 1;
+ }
+ /* Do we need to enter persist? */
+ if ((bbr->rc_in_persist == 0) &&
+ (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) &&
+ TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->snd_max == tp->snd_una) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd) &&
+ (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) {
+ /* No send window.. we must enter persist */
+ bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__);
+ }
+ if (tp->t_flags2 & TF2_DROP_AF_DATA) {
+ m_freem(m);
+ return (0);
+ }
+ /*
+ * Process segments with URG.
+ */
+ if ((thflags & TH_URG) && th->th_urp &&
+ TCPS_HAVERCVDFIN(tp->t_state) == 0) {
+ /*
+ * This is a kludge, but if we receive and accept random
+ * urgent pointers, we'll crash in soreceive. It's hard to
+ * imagine someone actually wanting to send this much urgent
+ * data.
+ */
+ SOCKBUF_LOCK(&so->so_rcv);
+ if (th->th_urp + sbavail(&so->so_rcv) > sb_max) {
+ th->th_urp = 0; /* XXX */
+ thflags &= ~TH_URG; /* XXX */
+ SOCKBUF_UNLOCK(&so->so_rcv); /* XXX */
+ goto dodata; /* XXX */
+ }
+ /*
+ * If this segment advances the known urgent pointer, then
+ * mark the data stream. This should not happen in
+ * CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since a
+ * FIN has been received from the remote side. In these
+ * states we ignore the URG.
+ *
+ * According to RFC961 (Assigned Protocols), the urgent
+ * pointer points to the last octet of urgent data. We
+ * continue, however, to consider it to indicate the first
+ * octet of data past the urgent section as the original
+ * spec states (in one of two places).
+ */
+ if (SEQ_GT(th->th_seq + th->th_urp, tp->rcv_up)) {
+ tp->rcv_up = th->th_seq + th->th_urp;
+ so->so_oobmark = sbavail(&so->so_rcv) +
+ (tp->rcv_up - tp->rcv_nxt) - 1;
+ if (so->so_oobmark == 0)
+ so->so_rcv.sb_state |= SBS_RCVATMARK;
+ sohasoutofband(so);
+ tp->t_oobflags &= ~(TCPOOB_HAVEDATA | TCPOOB_HADDATA);
+ }
+ SOCKBUF_UNLOCK(&so->so_rcv);
+ /*
+ * Remove out of band data so doesn't get presented to user.
+ * This can happen independent of advancing the URG pointer,
+ * but if two URG's are pending at once, some out-of-band
+ * data may creep in... ick.
+ */
+ if (th->th_urp <= (uint32_t)tlen &&
+ !(so->so_options & SO_OOBINLINE)) {
+ /* hdr drop is delayed */
+ tcp_pulloutofband(so, th, m, drop_hdrlen);
+ }
+ } else {
+ /*
+ * If no out of band data is expected, pull receive urgent
+ * pointer along with the receive window.
+ */
+ if (SEQ_GT(tp->rcv_nxt, tp->rcv_up))
+ tp->rcv_up = tp->rcv_nxt;
+ }
+dodata: /* XXX */
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+
+ /*
+ * Process the segment text, merging it into the TCP sequencing
+ * queue, and arranging for acknowledgment of receipt if necessary.
+ * This process logically involves adjusting tp->rcv_wnd as data is
+ * presented to the user (this happens in tcp_usrreq.c, case
+ * PRU_RCVD). If a FIN has already been received on this connection
+ * then we just ignore the text.
+ */
+ tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) &&
+ IS_FASTOPEN(tp->t_flags));
+ if ((tlen || (thflags & TH_FIN) || tfo_syn) &&
+ TCPS_HAVERCVDFIN(tp->t_state) == 0) {
+ tcp_seq save_start = th->th_seq;
+ tcp_seq save_rnxt = tp->rcv_nxt;
+ int save_tlen = tlen;
+
+ m_adj(m, drop_hdrlen); /* delayed header drop */
+ /*
+ * Insert segment which includes th into TCP reassembly
+ * queue with control block tp. Set thflags to whether
+ * reassembly now includes a segment with FIN. This handles
+ * the common case inline (segment is the next to be
+ * received on an established connection, and the queue is
+ * empty), avoiding linkage into and removal from the queue
+ * and repetition of various conversions. Set DELACK for
+ * segments received in order, but ack immediately when
+ * segments are out of order (so fast retransmit can work).
+ */
+ if (th->th_seq == tp->rcv_nxt &&
+ SEGQ_EMPTY(tp) &&
+ (TCPS_HAVEESTABLISHED(tp->t_state) ||
+ tfo_syn)) {
+#ifdef NETFLIX_SB_LIMITS
+ u_int mcnt, appended;
+
+ if (so->so_rcv.sb_shlim) {
+ mcnt = m_memcnt(m);
+ appended = 0;
+ if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
+ CFO_NOSLEEP, NULL) == false) {
+ counter_u64_add(tcp_sb_shlim_fails, 1);
+ m_freem(m);
+ return (0);
+ }
+ }
+#endif
+ if (DELAY_ACK(tp, bbr, nsegs) || tfo_syn) {
+ bbr->bbr_segs_rcvd += max(1, nsegs);
+ tp->t_flags |= TF_DELACK;
+ bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime);
+ } else {
+ bbr->r_wanted_output = 1;
+ tp->t_flags |= TF_ACKNOW;
+ }
+ tp->rcv_nxt += tlen;
+ thflags = th->th_flags & TH_FIN;
+ TCPSTAT_ADD(tcps_rcvpack, (int)nsegs);
+ TCPSTAT_ADD(tcps_rcvbyte, tlen);
+ SOCKBUF_LOCK(&so->so_rcv);
+ if (so->so_rcv.sb_state & SBS_CANTRCVMORE)
+ m_freem(m);
+ else
+#ifdef NETFLIX_SB_LIMITS
+ appended =
+#endif
+ sbappendstream_locked(&so->so_rcv, m, 0);
+ /* NB: sorwakeup_locked() does an implicit unlock. */
+ sorwakeup_locked(so);
+#ifdef NETFLIX_SB_LIMITS
+ if (so->so_rcv.sb_shlim && appended != mcnt)
+ counter_fo_release(so->so_rcv.sb_shlim,
+ mcnt - appended);
+#endif
+ } else {
+ /*
+ * XXX: Due to the header drop above "th" is
+ * theoretically invalid by now. Fortunately
+ * m_adj() doesn't actually frees any mbufs when
+ * trimming from the head.
+ */
+ tcp_seq temp = save_start;
+ thflags = tcp_reass(tp, th, &temp, &tlen, m);
+ tp->t_flags |= TF_ACKNOW;
+ }
+ if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) {
+ if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) {
+ /*
+ * DSACK actually handled in the fastpath
+ * above.
+ */
+ tcp_update_sack_list(tp, save_start,
+ save_start + save_tlen);
+ } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) {
+ if ((tp->rcv_numsacks >= 1) &&
+ (tp->sackblks[0].end == save_start)) {
+ /*
+ * Partial overlap, recorded at todrop
+ * above.
+ */
+ tcp_update_sack_list(tp,
+ tp->sackblks[0].start,
+ tp->sackblks[0].end);
+ } else {
+ tcp_update_dsack_list(tp, save_start,
+ save_start + save_tlen);
+ }
+ } else if (tlen >= save_tlen) {
+ /* Update of sackblks. */
+ tcp_update_dsack_list(tp, save_start,
+ save_start + save_tlen);
+ } else if (tlen > 0) {
+ tcp_update_dsack_list(tp, save_start,
+ save_start + tlen);
+ }
+ }
+ } else {
+ m_freem(m);
+ thflags &= ~TH_FIN;
+ }
+
+ /*
+ * If FIN is received ACK the FIN and let the user know that the
+ * connection is closing.
+ */
+ if (thflags & TH_FIN) {
+ if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
+ socantrcvmore(so);
+ /*
+ * If connection is half-synchronized (ie NEEDSYN
+ * flag on) then delay ACK, so it may be piggybacked
+ * when SYN is sent. Otherwise, since we received a
+ * FIN then no more input can be expected, send ACK
+ * now.
+ */
+ if (tp->t_flags & TF_NEEDSYN) {
+ tp->t_flags |= TF_DELACK;
+ bbr_timer_cancel(bbr,
+ __LINE__, bbr->r_ctl.rc_rcvtime);
+ } else {
+ tp->t_flags |= TF_ACKNOW;
+ }
+ tp->rcv_nxt++;
+ }
+ switch (tp->t_state) {
+
+ /*
+ * In SYN_RECEIVED and ESTABLISHED STATES enter the
+ * CLOSE_WAIT state.
+ */
+ case TCPS_SYN_RECEIVED:
+ tp->t_starttime = ticks;
+ /* FALLTHROUGH */
+ case TCPS_ESTABLISHED:
+ tcp_state_change(tp, TCPS_CLOSE_WAIT);
+ break;
+
+ /*
+ * If still in FIN_WAIT_1 STATE FIN has not been
+ * acked so enter the CLOSING state.
+ */
+ case TCPS_FIN_WAIT_1:
+ tcp_state_change(tp, TCPS_CLOSING);
+ break;
+
+ /*
+ * In FIN_WAIT_2 state enter the TIME_WAIT state,
+ * starting the time-wait timer, turning off the
+ * other standard timers.
+ */
+ case TCPS_FIN_WAIT_2:
+ bbr->rc_timer_first = 1;
+ bbr_timer_cancel(bbr,
+ __LINE__, bbr->r_ctl.rc_rcvtime);
+ INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ tcp_twstart(tp);
+ return (1);
+ }
+ }
+ /*
+ * Return any desired output.
+ */
+ if ((tp->t_flags & TF_ACKNOW) ||
+ (sbavail(&so->so_snd) > ctf_outstanding(tp))) {
+ bbr->r_wanted_output = 1;
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ return (0);
+}
+
+/*
+ * Here nothing is really faster, its just that we
+ * have broken out the fast-data path also just like
+ * the fast-ack. Return 1 if we processed the packet
+ * return 0 if you need to take the "slow-path".
+ */
+static int
+bbr_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t nxt_pkt)
+{
+ uint16_t nsegs;
+ int32_t newsize = 0; /* automatic sockbuf scaling */
+ struct tcp_bbr *bbr;
+#ifdef NETFLIX_SB_LIMITS
+ u_int mcnt, appended;
+#endif
+#ifdef TCPDEBUG
+ /*
+ * The size of tcp_saveipgen must be the size of the max ip header,
+ * now IPv6.
+ */
+ u_char tcp_saveipgen[IP6_HDR_LEN];
+ struct tcphdr tcp_savetcp;
+ short ostate = 0;
+
+#endif
+ /* On the hpts and we would have called output */
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * the timestamp. NOTE that the test is modified according to the
+ * latest proposal of the tcplw@cray.com list (Braden 1993/04/26).
+ */
+ if (bbr->r_ctl.rc_resend != NULL) {
+ return (0);
+ }
+ if (tiwin && tiwin != tp->snd_wnd) {
+ return (0);
+ }
+ if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) {
+ return (0);
+ }
+ if (__predict_false((to->to_flags & TOF_TS) &&
+ (TSTMP_LT(to->to_tsval, tp->ts_recent)))) {
+ return (0);
+ }
+ if (__predict_false((th->th_ack != tp->snd_una))) {
+ return (0);
+ }
+ if (__predict_false(tlen > sbspace(&so->so_rcv))) {
+ return (0);
+ }
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * This is a pure, in-sequence data packet with nothing on the
+ * reassembly queue and we have enough buffer space to take it.
+ */
+ nsegs = max(1, m->m_pkthdr.lro_nsegs);
+#ifdef NETFLIX_SB_LIMITS
+ if (so->so_rcv.sb_shlim) {
+ mcnt = m_memcnt(m);
+ appended = 0;
+ if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
+ CFO_NOSLEEP, NULL) == false) {
+ counter_u64_add(tcp_sb_shlim_fails, 1);
+ m_freem(m);
+ return (1);
+ }
+ }
+#endif
+ /* Clean receiver SACK report if present */
+ if (tp->rcv_numsacks)
+ tcp_clean_sackreport(tp);
+ TCPSTAT_INC(tcps_preddat);
+ tp->rcv_nxt += tlen;
+ /*
+ * Pull snd_wl1 up to prevent seq wrap relative to th_seq.
+ */
+ tp->snd_wl1 = th->th_seq;
+ /*
+ * Pull rcv_up up to prevent seq wrap relative to rcv_nxt.
+ */
+ tp->rcv_up = tp->rcv_nxt;
+ TCPSTAT_ADD(tcps_rcvpack, (int)nsegs);
+ TCPSTAT_ADD(tcps_rcvbyte, tlen);
+#ifdef TCPDEBUG
+ if (so->so_options & SO_DEBUG)
+ tcp_trace(TA_INPUT, ostate, tp,
+ (void *)tcp_saveipgen, &tcp_savetcp, 0);
+#endif
+ newsize = tcp_autorcvbuf(m, th, so, tp, tlen);
+
+ /* Add data to socket buffer. */
+ SOCKBUF_LOCK(&so->so_rcv);
+ if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
+ m_freem(m);
+ } else {
+ /*
+ * Set new socket buffer size. Give up when limit is
+ * reached.
+ */
+ if (newsize)
+ if (!sbreserve_locked(&so->so_rcv,
+ newsize, so, NULL))
+ so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
+ m_adj(m, drop_hdrlen); /* delayed header drop */
+#ifdef NETFLIX_SB_LIMITS
+ appended =
+#endif
+ sbappendstream_locked(&so->so_rcv, m, 0);
+ ctf_calc_rwin(so, tp);
+ }
+ /* NB: sorwakeup_locked() does an implicit unlock. */
+ sorwakeup_locked(so);
+#ifdef NETFLIX_SB_LIMITS
+ if (so->so_rcv.sb_shlim && mcnt != appended)
+ counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended);
+#endif
+ if (DELAY_ACK(tp, bbr, nsegs)) {
+ bbr->bbr_segs_rcvd += max(1, nsegs);
+ tp->t_flags |= TF_DELACK;
+ bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime);
+ } else {
+ bbr->r_wanted_output = 1;
+ tp->t_flags |= TF_ACKNOW;
+ }
+ return (1);
+}
+
+/*
+ * This subfunction is used to try to highly optimize the
+ * fast path. We again allow window updates that are
+ * in sequence to remain in the fast-path. We also add
+ * in the __predict's to attempt to help the compiler.
+ * Note that if we return a 0, then we can *not* process
+ * it and the caller should push the packet into the
+ * slow-path. If we return 1, then all is well and
+ * the packet is fully processed.
+ */
+static int
+bbr_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t nxt_pkt)
+{
+ int32_t acked;
+ uint16_t nsegs;
+ uint32_t sack_changed;
+#ifdef TCPDEBUG
+ /*
+ * The size of tcp_saveipgen must be the size of the max ip header,
+ * now IPv6.
+ */
+ u_char tcp_saveipgen[IP6_HDR_LEN];
+ struct tcphdr tcp_savetcp;
+ short ostate = 0;
+
+#endif
+ uint32_t prev_acked = 0;
+ struct tcp_bbr *bbr;
+
+ if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
+ /* Old ack, behind (or duplicate to) the last one rcv'd */
+ return (0);
+ }
+ if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) {
+ /* Above what we have sent? */
+ return (0);
+ }
+ if (__predict_false(tiwin == 0)) {
+ /* zero window */
+ return (0);
+ }
+ if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) {
+ /* We need a SYN or a FIN, unlikely.. */
+ return (0);
+ }
+ if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) {
+ /* Timestamp is behind .. old ack with seq wrap? */
+ return (0);
+ }
+ if (__predict_false(IN_RECOVERY(tp->t_flags))) {
+ /* Still recovering */
+ return (0);
+ }
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ if (__predict_false(bbr->r_ctl.rc_resend != NULL)) {
+ /* We are retransmitting */
+ return (0);
+ }
+ if (__predict_false(bbr->rc_in_persist != 0)) {
+ /* In persist mode */
+ return (0);
+ }
+ if (bbr->r_ctl.rc_sacked) {
+ /* We have sack holes on our scoreboard */
+ return (0);
+ }
+ /* Ok if we reach here, we can process a fast-ack */
+ nsegs = max(1, m->m_pkthdr.lro_nsegs);
+ sack_changed = bbr_log_ack(tp, to, th, &prev_acked);
+ /*
+ * We never detect loss in fast ack [we can't
+ * have a sack and can't be in recovery so
+ * we always pass 0 (nothing detected)].
+ */
+ bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, 0);
+ /* Did the window get updated? */
+ if (tiwin != tp->snd_wnd) {
+ tp->snd_wnd = tiwin;
+ tp->snd_wl1 = th->th_seq;
+ if (tp->snd_wnd > tp->max_sndwnd)
+ tp->max_sndwnd = tp->snd_wnd;
+ }
+ /* Do we need to exit persists? */
+ if ((bbr->rc_in_persist != 0) &&
+ (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2),
+ bbr_minseg(bbr)))) {
+ bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__);
+ bbr->r_wanted_output = 1;
+ }
+ /* Do we need to enter persists? */
+ if ((bbr->rc_in_persist == 0) &&
+ (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) &&
+ TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->snd_max == tp->snd_una) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd) &&
+ (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) {
+ /* No send window.. we must enter persist */
+ bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * the timestamp. NOTE that the test is modified according to the
+ * latest proposal of the tcplw@cray.com list (Braden 1993/04/26).
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
+ tp->ts_recent_age = bbr->r_ctl.rc_rcvtime;
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * This is a pure ack for outstanding data.
+ */
+ TCPSTAT_INC(tcps_predack);
+
+ /*
+ * "bad retransmit" recovery.
+ */
+ if (tp->t_flags & TF_PREVVALID) {
+ tp->t_flags &= ~TF_PREVVALID;
+ if (tp->t_rxtshift == 1 &&
+ (int)(ticks - tp->t_badrxtwin) < 0)
+ bbr_cong_signal(tp, th, CC_RTO_ERR, NULL);
+ }
+ /*
+ * Recalculate the transmit timer / rtt.
+ *
+ * Some boxes send broken timestamp replies during the SYN+ACK
+ * phase, ignore timestamps of 0 or we could calculate a huge RTT
+ * and blow up the retransmit timer.
+ */
+ acked = BYTES_THIS_ACK(tp, th);
+
+#ifdef TCP_HHOOK
+ /* Run HHOOK_TCP_ESTABLISHED_IN helper hooks. */
+ hhook_run_tcp_est_in(tp, th, to);
+#endif
+
+ TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs);
+ TCPSTAT_ADD(tcps_rcvackbyte, acked);
+ sbdrop(&so->so_snd, acked);
+
+ if (SEQ_GT(th->th_ack, tp->snd_una))
+ bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp));
+ tp->snd_una = th->th_ack;
+ if (tp->snd_wnd < ctf_outstanding(tp))
+ /* The peer collapsed its window on us */
+ bbr_collapsed_window(bbr);
+ else if (bbr->rc_has_collapsed)
+ bbr_un_collapse_window(bbr);
+
+ if (SEQ_GT(tp->snd_una, tp->snd_recover)) {
+ tp->snd_recover = tp->snd_una;
+ }
+ bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, 0);
+ /*
+ * Pull snd_wl2 up to prevent seq wrap relative to th_ack.
+ */
+ tp->snd_wl2 = th->th_ack;
+ m_freem(m);
+ /*
+ * If all outstanding data are acked, stop retransmit timer,
+ * otherwise restart timer using current (possibly backed-off)
+ * value. If process is waiting for space, wakeup/selwakeup/signal.
+ * If data are ready to send, let tcp_output decide between more
+ * output or persist.
+ */
+#ifdef TCPDEBUG
+ if (so->so_options & SO_DEBUG)
+ tcp_trace(TA_INPUT, ostate, tp,
+ (void *)tcp_saveipgen,
+ &tcp_savetcp, 0);
+#endif
+ /* Wake up the socket if we have room to write more */
+ sowwakeup(so);
+ if (tp->snd_una == tp->snd_max) {
+ /* Nothing left outstanding */
+ bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__);
+ if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0)
+ bbr->rc_tp->t_acktime = 0;
+ bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime);
+ if (bbr->rc_in_persist == 0) {
+ bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime;
+ }
+ sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
+ bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime);
+ /*
+ * We invalidate the last ack here since we
+ * don't want to transfer forward the time
+ * for our sum's calculations.
+ */
+ bbr->r_wanted_output = 1;
+ }
+ if (sbavail(&so->so_snd)) {
+ bbr->r_wanted_output = 1;
+ }
+ return (1);
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ int32_t todrop;
+ int32_t ourfinisacked = 0;
+ struct tcp_bbr *bbr;
+ int32_t ret_val = 0;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ /*
+ * If the state is SYN_SENT: if seg contains an ACK, but not for our
+ * SYN, drop the input. if seg contains a RST, then drop the
+ * connection. if seg does not contain SYN, then drop it. Otherwise
+ * this is an acceptable SYN segment initialize tp->rcv_nxt and
+ * tp->irs if seg contains ack then advance tp->snd_una. BRR does
+ * not support ECN so we will not say we are capable. if SYN has
+ * been acked change to ESTABLISHED else SYN_RCVD state arrange for
+ * segment to be acked (eventually) continue processing rest of
+ * data/controls, beginning with URG
+ */
+ if ((thflags & TH_ACK) &&
+ (SEQ_LEQ(th->th_ack, tp->iss) ||
+ SEQ_GT(th->th_ack, tp->snd_max))) {
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) {
+ TCP_PROBE5(connect__refused, NULL, tp,
+ mtod(m, const char *), tp, th);
+ tp = tcp_drop(tp, ECONNREFUSED);
+ ctf_do_drop(m, tp);
+ return (1);
+ }
+ if (thflags & TH_RST) {
+ ctf_do_drop(m, tp);
+ return (1);
+ }
+ if (!(thflags & TH_SYN)) {
+ ctf_do_drop(m, tp);
+ return (1);
+ }
+ tp->irs = th->th_seq;
+ tcp_rcvseqinit(tp);
+ if (thflags & TH_ACK) {
+ int tfo_partial = 0;
+
+ TCPSTAT_INC(tcps_connects);
+ soisconnected(so);
+#ifdef MAC
+ mac_socketpeer_set_from_mbuf(m, so);
+#endif
+ /* Do window scaling on this connection? */
+ if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
+ (TF_RCVD_SCALE | TF_REQ_SCALE)) {
+ tp->rcv_scale = tp->request_r_scale;
+ }
+ tp->rcv_adv += min(tp->rcv_wnd,
+ TCP_MAXWIN << tp->rcv_scale);
+ /*
+ * If not all the data that was sent in the TFO SYN
+ * has been acked, resend the remainder right away.
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ (tp->snd_una != tp->snd_max)) {
+ tp->snd_nxt = th->th_ack;
+ tfo_partial = 1;
+ }
+ /*
+ * If there's data, delay ACK; if there's also a FIN ACKNOW
+ * will be turned on later.
+ */
+ if (DELAY_ACK(tp, bbr, 1) && tlen != 0 && (tfo_partial == 0)) {
+ bbr->bbr_segs_rcvd += 1;
+ tp->t_flags |= TF_DELACK;
+ bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime);
+ } else {
+ bbr->r_wanted_output = 1;
+ tp->t_flags |= TF_ACKNOW;
+ }
+ if (SEQ_GT(th->th_ack, tp->iss)) {
+ /*
+ * The SYN is acked
+ * handle it specially.
+ */
+ bbr_log_syn(tp, to);
+ }
+ if (SEQ_GT(th->th_ack, tp->snd_una)) {
+ /*
+ * We advance snd_una for the
+ * fast open case. If th_ack is
+ * acknowledging data beyond
+ * snd_una we can't just call
+ * ack-processing since the
+ * data stream in our send-map
+ * will start at snd_una + 1 (one
+ * beyond the SYN). If its just
+ * equal we don't need to do that
+ * and there is no send_map.
+ */
+ tp->snd_una++;
+ }
+ /*
+ * Received <SYN,ACK> in SYN_SENT[*] state. Transitions:
+ * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1
+ */
+ tp->t_starttime = ticks;
+ if (tp->t_flags & TF_NEEDFIN) {
+ tcp_state_change(tp, TCPS_FIN_WAIT_1);
+ tp->t_flags &= ~TF_NEEDFIN;
+ thflags &= ~TH_SYN;
+ } else {
+ tcp_state_change(tp, TCPS_ESTABLISHED);
+ TCP_PROBE5(connect__established, NULL, tp,
+ mtod(m, const char *), tp, th);
+ cc_conn_init(tp);
+ }
+ } else {
+ /*
+ * Received initial SYN in SYN-SENT[*] state => simultaneous
+ * open. If segment contains CC option and there is a
+ * cached CC, apply TAO test. If it succeeds, connection is *
+ * half-synchronized. Otherwise, do 3-way handshake:
+ * SYN-SENT -> SYN-RECEIVED SYN-SENT* -> SYN-RECEIVED* If
+ * there was no CC option, clear cached CC value.
+ */
+ tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN);
+ tcp_state_change(tp, TCPS_SYN_RECEIVED);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ /*
+ * Advance th->th_seq to correspond to first data byte. If data,
+ * trim to stay within window, dropping FIN if necessary.
+ */
+ th->th_seq++;
+ if (tlen > tp->rcv_wnd) {
+ todrop = tlen - tp->rcv_wnd;
+ m_adj(m, -todrop);
+ tlen = tp->rcv_wnd;
+ thflags &= ~TH_FIN;
+ TCPSTAT_INC(tcps_rcvpackafterwin);
+ TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop);
+ }
+ tp->snd_wl1 = th->th_seq - 1;
+ tp->rcv_up = th->th_seq;
+ /*
+ * Client side of transaction: already sent SYN and data. If the
+ * remote host used T/TCP to validate the SYN, our data will be
+ * ACK'd; if so, enter normal data segment processing in the middle
+ * of step 5, ack processing. Otherwise, goto step 6.
+ */
+ if (thflags & TH_ACK) {
+ if ((to->to_flags & TOF_TS) != 0) {
+ uint32_t t, rtt;
+
+ t = tcp_tv_to_mssectick(&bbr->rc_tv);
+ if (TSTMP_GEQ(t, to->to_tsecr)) {
+ rtt = t - to->to_tsecr;
+ if (rtt == 0) {
+ rtt = 1;
+ }
+ rtt *= MS_IN_USEC;
+ tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0);
+ apply_filter_min_small(&bbr->r_ctl.rc_rttprop,
+ rtt, bbr->r_ctl.rc_rcvtime);
+ }
+ }
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val))
+ return (ret_val);
+ /* We may have changed to FIN_WAIT_1 above */
+ if (tp->t_state == TCPS_FIN_WAIT_1) {
+ /*
+ * In FIN_WAIT_1 STATE in addition to the processing
+ * for the ESTABLISHED state if our FIN is now
+ * acknowledged then enter FIN_WAIT_2.
+ */
+ if (ourfinisacked) {
+ /*
+ * If we can't receive any more data, then
+ * closing user can proceed. Starting the
+ * timer is contrary to the specification,
+ * but if we don't get a FIN we'll hang
+ * forever.
+ *
+ * XXXjl: we should release the tp also, and
+ * use a compressed state.
+ */
+ if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
+ soisdisconnected(so);
+ tcp_timer_activate(tp, TT_2MSL,
+ (tcp_fast_finwait2_recycle ?
+ tcp_finwait2_timeout :
+ TP_MAXIDLE(tp)));
+ }
+ tcp_state_change(tp, TCPS_FIN_WAIT_2);
+ }
+ }
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ int32_t ourfinisacked = 0;
+ int32_t ret_val;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ if ((thflags & TH_ACK) &&
+ (SEQ_LEQ(th->th_ack, tp->snd_una) ||
+ SEQ_GT(th->th_ack, tp->snd_max))) {
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ if (IS_FASTOPEN(tp->t_flags)) {
+ /*
+ * When a TFO connection is in SYN_RECEIVED, the only valid
+ * packets are the initial SYN, a retransmit/copy of the
+ * initial SYN (possibly with a subset of the original
+ * data), a valid ACK, a FIN, or a RST.
+ */
+ if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ } else if (thflags & TH_SYN) {
+ /* non-initial SYN is ignored */
+ if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RXT) ||
+ (bbr->r_ctl.rc_hpts_flags & PACE_TMR_TLP) ||
+ (bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ /*
+ * In the SYN-RECEIVED state, validate that the packet belongs to
+ * this connection before trimming the data to fit the receive
+ * window. Check the sequence number versus IRS since we know the
+ * sequence numbers haven't wrapped. This is a partial fix for the
+ * "LAND" DoS attack.
+ */
+ if (SEQ_LT(th->th_seq, tp->irs)) {
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ tp->snd_wnd = tiwin;
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (IS_FASTOPEN(tp->t_flags)) {
+ cc_conn_init(tp);
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ }
+ TCPSTAT_INC(tcps_connects);
+ soisconnected(so);
+ /* Do window scaling? */
+ if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
+ (TF_RCVD_SCALE | TF_REQ_SCALE)) {
+ tp->rcv_scale = tp->request_r_scale;
+ }
+ /*
+ * ok for the first time in lets see if we can use the ts to figure
+ * out what the initial RTT was.
+ */
+ if ((to->to_flags & TOF_TS) != 0) {
+ uint32_t t, rtt;
+
+ t = tcp_tv_to_mssectick(&bbr->rc_tv);
+ if (TSTMP_GEQ(t, to->to_tsecr)) {
+ rtt = t - to->to_tsecr;
+ if (rtt == 0) {
+ rtt = 1;
+ }
+ rtt *= MS_IN_USEC;
+ tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0);
+ apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, bbr->r_ctl.rc_rcvtime);
+ }
+ }
+ /* Drop off any SYN in the send map (probably not there) */
+ if (thflags & TH_ACK)
+ bbr_log_syn(tp, to);
+ if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) {
+
+ tcp_fastopen_decrement_counter(tp->t_tfo_pending);
+ tp->t_tfo_pending = NULL;
+ /*
+ * Account for the ACK of our SYN prior to regular
+ * ACK processing below.
+ */
+ tp->snd_una++;
+ }
+ /*
+ * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* ->
+ * FIN-WAIT-1
+ */
+ tp->t_starttime = ticks;
+ if (tp->t_flags & TF_NEEDFIN) {
+ tcp_state_change(tp, TCPS_FIN_WAIT_1);
+ tp->t_flags &= ~TF_NEEDFIN;
+ } else {
+ tcp_state_change(tp, TCPS_ESTABLISHED);
+ TCP_PROBE5(accept__established, NULL, tp,
+ mtod(m, const char *), tp, th);
+ /*
+ * TFO connections call cc_conn_init() during SYN
+ * processing. Calling it again here for such connections
+ * is not harmless as it would undo the snd_cwnd reduction
+ * that occurs when a TFO SYN|ACK is retransmitted.
+ */
+ if (!IS_FASTOPEN(tp->t_flags))
+ cc_conn_init(tp);
+ }
+ /*
+ * If segment contains data or ACK, will call tcp_reass() later; if
+ * not, do so now to pass queued data to user.
+ */
+ if (tlen == 0 && (thflags & TH_FIN) == 0)
+ (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0,
+ (struct mbuf *)0);
+ tp->snd_wl1 = th->th_seq - 1;
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (tp->t_state == TCPS_FIN_WAIT_1) {
+ /* We could have went to FIN_WAIT_1 (or EST) above */
+ /*
+ * In FIN_WAIT_1 STATE in addition to the processing for the
+ * ESTABLISHED state if our FIN is now acknowledged then
+ * enter FIN_WAIT_2.
+ */
+ if (ourfinisacked) {
+ /*
+ * If we can't receive any more data, then closing
+ * user can proceed. Starting the timer is contrary
+ * to the specification, but if we don't get a FIN
+ * we'll hang forever.
+ *
+ * XXXjl: we should release the tp also, and use a
+ * compressed state.
+ */
+ if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
+ soisdisconnected(so);
+ tcp_timer_activate(tp, TT_2MSL,
+ (tcp_fast_finwait2_recycle ?
+ tcp_finwait2_timeout :
+ TP_MAXIDLE(tp)));
+ }
+ tcp_state_change(tp, TCPS_FIN_WAIT_2);
+ }
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ struct tcp_bbr *bbr;
+ int32_t ret_val;
+
+ /*
+ * Header prediction: check for the two common cases of a
+ * uni-directional data xfer. If the packet has no control flags,
+ * is in-sequence, the window didn't change and we're not
+ * retransmitting, it's a candidate. If the length is zero and the
+ * ack moved forward, we're the sender side of the xfer. Just free
+ * the data acked & wake any higher level process that was blocked
+ * waiting for space. If the length is non-zero and the ack didn't
+ * move, we're the receiver side. If we're getting packets in-order
+ * (the reassembly queue is empty), add the data toc The socket
+ * buffer and note that we need a delayed ack. Make sure that the
+ * hidden state-flags are also off. Since we check for
+ * TCPS_ESTABLISHED first, it can only be TH_NEEDSYN.
+ */
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ if (bbr->r_ctl.rc_delivered < (4 * tp->t_maxseg)) {
+ /*
+ * If we have delived under 4 segments increase the initial
+ * window if raised by the peer. We use this to determine
+ * dynamic and static rwnd's at the end of a connection.
+ */
+ bbr->r_ctl.rc_init_rwnd = max(tiwin, tp->snd_wnd);
+ }
+ if (__predict_true(((to->to_flags & TOF_SACK) == 0)) &&
+ __predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_URG | TH_ACK)) == TH_ACK) &&
+ __predict_true(SEGQ_EMPTY(tp)) &&
+ __predict_true(th->th_seq == tp->rcv_nxt)) {
+ if (tlen == 0) {
+ if (bbr_fastack(m, th, so, tp, to, drop_hdrlen, tlen,
+ tiwin, nxt_pkt)) {
+ return (0);
+ }
+ } else {
+ if (bbr_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen,
+ tiwin, nxt_pkt)) {
+ return (0);
+ }
+ }
+ }
+ ctf_calc_rwin(so, tp);
+
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+ /*
+ * RFC5961 Section 4.2 Send challenge ACK for any SYN in
+ * synchronized state.
+ */
+ if (thflags & TH_SYN) {
+ ctf_challenge_ack(m, th, tp, &ret_val);
+ return (ret_val);
+ }
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (tp->t_flags & TF_NEEDSYN) {
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ } else if (tp->t_flags & TF_ACKNOW) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ bbr->r_wanted_output = 1;
+ return (ret_val);
+ } else {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ /*
+ * Ack processing.
+ */
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (sbavail(&so->so_snd)) {
+ if (bbr_progress_timeout_check(bbr)) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ }
+ /* State changes only happen in bbr_process_data() */
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ struct tcp_bbr *bbr;
+ int32_t ret_val;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+ /*
+ * RFC5961 Section 4.2 Send challenge ACK for any SYN in
+ * synchronized state.
+ */
+ if (thflags & TH_SYN) {
+ ctf_challenge_ack(m, th, tp, &ret_val);
+ return (ret_val);
+ }
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (tp->t_flags & TF_NEEDSYN) {
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ } else if (tp->t_flags & TF_ACKNOW) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ bbr->r_wanted_output = 1;
+ return (ret_val);
+ } else {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ /*
+ * Ack processing.
+ */
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (sbavail(&so->so_snd)) {
+ if (bbr_progress_timeout_check(bbr)) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+static int
+bbr_check_data_after_close(struct mbuf *m, struct tcp_bbr *bbr,
+ struct tcpcb *tp, int32_t * tlen, struct tcphdr *th, struct socket *so)
+{
+
+ INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
+ if (bbr->rc_allow_data_af_clo == 0) {
+close_now:
+ tp = tcp_close(tp);
+ TCPSTAT_INC(tcps_rcvafterclose);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen));
+ return (1);
+ }
+ if (sbavail(&so->so_snd) == 0)
+ goto close_now;
+ /* Ok we allow data that is ignored and a followup reset */
+ tp->rcv_nxt = th->th_seq + *tlen;
+ tp->t_flags2 |= TF2_DROP_AF_DATA;
+ bbr->r_wanted_output = 1;
+ *tlen = 0;
+ return (0);
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ int32_t ourfinisacked = 0;
+ int32_t ret_val;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+ /*
+ * RFC5961 Section 4.2 Send challenge ACK for any SYN in
+ * synchronized state.
+ */
+ if (thflags & TH_SYN) {
+ ctf_challenge_ack(m, th, tp, &ret_val);
+ return (ret_val);
+ }
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If new data are received on a connection after the user processes
+ * are gone, then RST the other end.
+ */
+ if ((so->so_state & SS_NOFDREF) && tlen) {
+ /*
+ * We call a new function now so we might continue and setup
+ * to reset at all data being ack'd.
+ */
+ if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so))
+ return (1);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (tp->t_flags & TF_NEEDSYN) {
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ } else if (tp->t_flags & TF_ACKNOW) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ bbr->r_wanted_output = 1;
+ return (ret_val);
+ } else {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ /*
+ * Ack processing.
+ */
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (ourfinisacked) {
+ /*
+ * If we can't receive any more data, then closing user can
+ * proceed. Starting the timer is contrary to the
+ * specification, but if we don't get a FIN we'll hang
+ * forever.
+ *
+ * XXXjl: we should release the tp also, and use a
+ * compressed state.
+ */
+ if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
+ soisdisconnected(so);
+ tcp_timer_activate(tp, TT_2MSL,
+ (tcp_fast_finwait2_recycle ?
+ tcp_finwait2_timeout :
+ TP_MAXIDLE(tp)));
+ }
+ tcp_state_change(tp, TCPS_FIN_WAIT_2);
+ }
+ if (sbavail(&so->so_snd)) {
+ if (bbr_progress_timeout_check(bbr)) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ int32_t ourfinisacked = 0;
+ int32_t ret_val;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+ /*
+ * RFC5961 Section 4.2 Send challenge ACK for any SYN in
+ * synchronized state.
+ */
+ if (thflags & TH_SYN) {
+ ctf_challenge_ack(m, th, tp, &ret_val);
+ return (ret_val);
+ }
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If new data are received on a connection after the user processes
+ * are gone, then RST the other end.
+ */
+ if ((so->so_state & SS_NOFDREF) && tlen) {
+ /*
+ * We call a new function now so we might continue and setup
+ * to reset at all data being ack'd.
+ */
+ if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so))
+ return (1);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (tp->t_flags & TF_NEEDSYN) {
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ } else if (tp->t_flags & TF_ACKNOW) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ bbr->r_wanted_output = 1;
+ return (ret_val);
+ } else {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ /*
+ * Ack processing.
+ */
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (ourfinisacked) {
+ INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
+ tcp_twstart(tp);
+ m_freem(m);
+ return (1);
+ }
+ if (sbavail(&so->so_snd)) {
+ if (bbr_progress_timeout_check(bbr)) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ int32_t ourfinisacked = 0;
+ int32_t ret_val;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+ /*
+ * RFC5961 Section 4.2 Send challenge ACK for any SYN in
+ * synchronized state.
+ */
+ if (thflags & TH_SYN) {
+ ctf_challenge_ack(m, th, tp, &ret_val);
+ return (ret_val);
+ }
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If new data are received on a connection after the user processes
+ * are gone, then RST the other end.
+ */
+ if ((so->so_state & SS_NOFDREF) && tlen) {
+ /*
+ * We call a new function now so we might continue and setup
+ * to reset at all data being ack'd.
+ */
+ if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so))
+ return (1);
+ }
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (tp->t_flags & TF_NEEDSYN) {
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ } else if (tp->t_flags & TF_ACKNOW) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ bbr->r_wanted_output = 1;
+ return (ret_val);
+ } else {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ /*
+ * case TCPS_LAST_ACK: Ack processing.
+ */
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (ourfinisacked) {
+ INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
+ tp = tcp_close(tp);
+ ctf_do_drop(m, tp);
+ return (1);
+ }
+ if (sbavail(&so->so_snd)) {
+ if (bbr_progress_timeout_check(bbr)) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ }
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+
+/*
+ * Return value of 1, the TCB is unlocked and most
+ * likely gone, return value of 0, the TCB is still
+ * locked.
+ */
+static int
+bbr_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
+{
+ int32_t ourfinisacked = 0;
+ int32_t ret_val;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ ctf_calc_rwin(so, tp);
+ /* Reset receive buffer auto scaling when not in bulk receive mode. */
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
+
+ /*
+ * RFC5961 Section 4.2 Send challenge ACK for any SYN in
+ * synchronized state.
+ */
+ if (thflags & TH_SYN) {
+ ctf_challenge_ack(m, th, tp, &ret_val);
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ /*
+ * RFC 1323 PAWS: If we have a timestamp reply on this segment and
+ * it's less than ts_recent, drop it.
+ */
+ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
+ TSTMP_LT(to->to_tsval, tp->ts_recent)) {
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ return (ret_val);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ return (ret_val);
+ }
+ /*
+ * If new data are received on a connection after the user processes
+ * are gone, then we may RST the other end depending on the outcome
+ * of bbr_check_data_after_close.
+ */
+ if ((so->so_state & SS_NOFDREF) &&
+ tlen) {
+ /*
+ * We call a new function now so we might continue and setup
+ * to reset at all data being ack'd.
+ */
+ if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so))
+ return (1);
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ /*
+ * If last ACK falls within this segment's sequence numbers, record
+ * its timestamp. NOTE: 1) That the test incorporates suggestions
+ * from the latest proposal of the tcplw@cray.com list (Braden
+ * 1993/04/26). 2) That updating only on newer timestamps interferes
+ * with our earlier PAWS tests, so this check should be solely
+ * predicated on the sequence space of this segment. 3) That we
+ * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
+ * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
+ * SEG.Len, This modified check allows us to overcome RFC1323's
+ * limitations as described in Stevens TCP/IP Illustrated Vol. 2
+ * p.869. In such cases, we can still calculate the RTT correctly
+ * when RCV.NXT == Last.ACK.Sent.
+ */
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if ((to->to_flags & TOF_TS) != 0 &&
+ SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
+ SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+ ((thflags & (TH_SYN | TH_FIN)) != 0))) {
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ tp->ts_recent = to->to_tsval;
+ }
+ /*
+ * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
+ * is on (half-synchronized state), then queue data for later
+ * processing; else drop segment and return.
+ */
+ if ((thflags & TH_ACK) == 0) {
+ if (tp->t_flags & TF_NEEDSYN) {
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+ } else if (tp->t_flags & TF_ACKNOW) {
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ bbr->r_wanted_output = 1;
+ return (ret_val);
+ } else {
+ ctf_do_drop(m, NULL);
+ return (0);
+ }
+ }
+ /*
+ * Ack processing.
+ */
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
+ return (ret_val);
+ }
+ if (sbavail(&so->so_snd)) {
+ if (bbr_progress_timeout_check(bbr)) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ }
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen,
+ tiwin, thflags, nxt_pkt));
+}
+
+static void
+bbr_stop_all_timers(struct tcpcb *tp)
+{
+ struct tcp_bbr *bbr;
+
+ /*
+ * Assure no timers are running.
+ */
+ if (tcp_timer_active(tp, TT_PERSIST)) {
+ /* We enter in persists, set the flag appropriately */
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ bbr->rc_in_persist = 1;
+ }
+ tcp_timer_suspend(tp, TT_PERSIST);
+ tcp_timer_suspend(tp, TT_REXMT);
+ tcp_timer_suspend(tp, TT_KEEP);
+ tcp_timer_suspend(tp, TT_DELACK);
+}
+
+static void
+bbr_google_mode_on(struct tcp_bbr *bbr)
+{
+ bbr->rc_use_google = 1;
+ bbr->rc_no_pacing = 0;
+ bbr->r_ctl.bbr_google_discount = bbr_google_discount;
+ bbr->r_use_policer = bbr_policer_detection_enabled;
+ bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10);
+ bbr->bbr_use_rack_cheat = 0;
+ bbr->r_ctl.rc_incr_tmrs = 0;
+ bbr->r_ctl.rc_inc_tcp_oh = 0;
+ bbr->r_ctl.rc_inc_ip_oh = 0;
+ bbr->r_ctl.rc_inc_enet_oh = 0;
+ reset_time(&bbr->r_ctl.rc_delrate,
+ BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT);
+ reset_time_small(&bbr->r_ctl.rc_rttprop,
+ (11 * USECS_IN_SECOND));
+ tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv));
+}
+
+static void
+bbr_google_mode_off(struct tcp_bbr *bbr)
+{
+ bbr->rc_use_google = 0;
+ bbr->r_ctl.bbr_google_discount = 0;
+ bbr->no_pacing_until = bbr_no_pacing_until;
+ bbr->r_use_policer = 0;
+ if (bbr->no_pacing_until)
+ bbr->rc_no_pacing = 1;
+ else
+ bbr->rc_no_pacing = 0;
+ if (bbr_use_rack_resend_cheat)
+ bbr->bbr_use_rack_cheat = 1;
+ else
+ bbr->bbr_use_rack_cheat = 0;
+ if (bbr_incr_timers)
+ bbr->r_ctl.rc_incr_tmrs = 1;
+ else
+ bbr->r_ctl.rc_incr_tmrs = 0;
+ if (bbr_include_tcp_oh)
+ bbr->r_ctl.rc_inc_tcp_oh = 1;
+ else
+ bbr->r_ctl.rc_inc_tcp_oh = 0;
+ if (bbr_include_ip_oh)
+ bbr->r_ctl.rc_inc_ip_oh = 1;
+ else
+ bbr->r_ctl.rc_inc_ip_oh = 0;
+ if (bbr_include_enet_oh)
+ bbr->r_ctl.rc_inc_enet_oh = 1;
+ else
+ bbr->r_ctl.rc_inc_enet_oh = 0;
+ bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit;
+ reset_time(&bbr->r_ctl.rc_delrate,
+ bbr_num_pktepo_for_del_limit);
+ reset_time_small(&bbr->r_ctl.rc_rttprop,
+ (bbr_filter_len_sec * USECS_IN_SECOND));
+ tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv));
+}
+/*
+ * Return 0 on success, non-zero on failure
+ * which indicates the error (usually no memory).
+ */
+static int
+bbr_init(struct tcpcb *tp)
+{
+ struct tcp_bbr *bbr = NULL;
+ struct inpcb *inp;
+ uint32_t cts;
+
+ tp->t_fb_ptr = uma_zalloc(bbr_pcb_zone, (M_NOWAIT | M_ZERO));
+ if (tp->t_fb_ptr == NULL) {
+ /*
+ * We need to allocate memory but cant. The INP and INP_INFO
+ * locks and they are recusive (happens during setup. So a
+ * scheme to drop the locks fails :(
+ *
+ */
+ return (ENOMEM);
+ }
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ bbr->rtt_valid = 0;
+ inp = tp->t_inpcb;
+ inp->inp_flags2 |= INP_CANNOT_DO_ECN;
+ inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
+ TAILQ_INIT(&bbr->r_ctl.rc_map);
+ TAILQ_INIT(&bbr->r_ctl.rc_free);
+ TAILQ_INIT(&bbr->r_ctl.rc_tmap);
+ bbr->rc_tp = tp;
+ if (tp->t_inpcb) {
+ bbr->rc_inp = tp->t_inpcb;
+ }
+ cts = tcp_get_usecs(&bbr->rc_tv);
+ tp->t_acktime = 0;
+ bbr->rc_allow_data_af_clo = bbr_ignore_data_after_close;
+ bbr->r_ctl.rc_reorder_fade = bbr_reorder_fade;
+ bbr->rc_tlp_threshold = bbr_tlp_thresh;
+ bbr->r_ctl.rc_reorder_shift = bbr_reorder_thresh;
+ bbr->r_ctl.rc_pkt_delay = bbr_pkt_delay;
+ bbr->r_ctl.rc_min_to = bbr_min_to;
+ bbr->rc_bbr_state = BBR_STATE_STARTUP;
+ bbr->r_ctl.bbr_lost_at_state = 0;
+ bbr->r_ctl.rc_lost_at_startup = 0;
+ bbr->rc_all_timers_stopped = 0;
+ bbr->r_ctl.rc_bbr_lastbtlbw = 0;
+ bbr->r_ctl.rc_pkt_epoch_del = 0;
+ bbr->r_ctl.rc_pkt_epoch = 0;
+ bbr->r_ctl.rc_lowest_rtt = 0xffffffff;
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_high_gain;
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain;
+ bbr->r_ctl.rc_went_idle_time = cts;
+ bbr->rc_pacer_started = cts;
+ bbr->r_ctl.rc_pkt_epoch_time = cts;
+ bbr->r_ctl.rc_rcvtime = cts;
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ bbr->r_ctl.rc_del_time = cts;
+ bbr->r_ctl.rc_tlp_rxt_last_time = cts;
+ bbr->r_ctl.last_in_probertt = cts;
+ bbr->skip_gain = 0;
+ bbr->gain_is_limited = 0;
+ bbr->no_pacing_until = bbr_no_pacing_until;
+ if (bbr->no_pacing_until)
+ bbr->rc_no_pacing = 1;
+ if (bbr_use_google_algo) {
+ bbr->rc_no_pacing = 0;
+ bbr->rc_use_google = 1;
+ bbr->r_ctl.bbr_google_discount = bbr_google_discount;
+ bbr->r_use_policer = bbr_policer_detection_enabled;
+ } else {
+ bbr->rc_use_google = 0;
+ bbr->r_ctl.bbr_google_discount = 0;
+ bbr->r_use_policer = 0;
+ }
+ if (bbr_ts_limiting)
+ bbr->rc_use_ts_limit = 1;
+ else
+ bbr->rc_use_ts_limit = 0;
+ if (bbr_ts_can_raise)
+ bbr->ts_can_raise = 1;
+ else
+ bbr->ts_can_raise = 0;
+ if (V_tcp_delack_enabled == 1)
+ tp->t_delayed_ack = 2;
+ else if (V_tcp_delack_enabled == 0)
+ tp->t_delayed_ack = 0;
+ else if (V_tcp_delack_enabled < 100)
+ tp->t_delayed_ack = V_tcp_delack_enabled;
+ else
+ tp->t_delayed_ack = 2;
+ if (bbr->rc_use_google == 0)
+ bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit;
+ else
+ bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10);
+ bbr->r_ctl.rc_min_rto_ms = bbr_rto_min_ms;
+ bbr->rc_max_rto_sec = bbr_rto_max_sec;
+ bbr->rc_init_win = bbr_def_init_win;
+ if (tp->t_flags & TF_REQ_TSTMP)
+ bbr->rc_last_options = TCP_TS_OVERHEAD;
+ bbr->r_ctl.rc_pace_max_segs = tp->t_maxseg - bbr->rc_last_options;
+ bbr->r_ctl.rc_high_rwnd = tp->snd_wnd;
+ bbr->r_init_rtt = 1;
+
+ counter_u64_add(bbr_flows_nohdwr_pacing, 1);
+ if (bbr_allow_hdwr_pacing)
+ bbr->bbr_hdw_pace_ena = 1;
+ else
+ bbr->bbr_hdw_pace_ena = 0;
+ if (bbr_sends_full_iwnd)
+ bbr->bbr_init_win_cheat = 1;
+ else
+ bbr->bbr_init_win_cheat = 0;
+ bbr->r_ctl.bbr_utter_max = bbr_hptsi_utter_max;
+ bbr->r_ctl.rc_drain_pg = bbr_drain_gain;
+ bbr->r_ctl.rc_startup_pg = bbr_high_gain;
+ bbr->rc_loss_exit = bbr_exit_startup_at_loss;
+ bbr->r_ctl.bbr_rttprobe_gain_val = bbr_rttprobe_gain;
+ bbr->r_ctl.bbr_hptsi_per_second = bbr_hptsi_per_second;
+ bbr->r_ctl.bbr_hptsi_segments_delay_tar = bbr_hptsi_segments_delay_tar;
+ bbr->r_ctl.bbr_hptsi_segments_max = bbr_hptsi_segments_max;
+ bbr->r_ctl.bbr_hptsi_segments_floor = bbr_hptsi_segments_floor;
+ bbr->r_ctl.bbr_hptsi_bytes_min = bbr_hptsi_bytes_min;
+ bbr->r_ctl.bbr_cross_over = bbr_cross_over;
+ bbr->r_ctl.rc_rtt_shrinks = cts;
+ if (bbr->rc_use_google) {
+ setup_time_filter(&bbr->r_ctl.rc_delrate,
+ FILTER_TYPE_MAX,
+ BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT);
+ setup_time_filter_small(&bbr->r_ctl.rc_rttprop,
+ FILTER_TYPE_MIN, (11 * USECS_IN_SECOND));
+ } else {
+ setup_time_filter(&bbr->r_ctl.rc_delrate,
+ FILTER_TYPE_MAX,
+ bbr_num_pktepo_for_del_limit);
+ setup_time_filter_small(&bbr->r_ctl.rc_rttprop,
+ FILTER_TYPE_MIN, (bbr_filter_len_sec * USECS_IN_SECOND));
+ }
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_INIT, 0);
+ if (bbr_uses_idle_restart)
+ bbr->rc_use_idle_restart = 1;
+ else
+ bbr->rc_use_idle_restart = 0;
+ bbr->r_ctl.rc_bbr_cur_del_rate = 0;
+ bbr->r_ctl.rc_initial_hptsi_bw = bbr_initial_bw_bps;
+ if (bbr_resends_use_tso)
+ bbr->rc_resends_use_tso = 1;
+#ifdef NETFLIX_PEAKRATE
+ tp->t_peakrate_thr = tp->t_maxpeakrate;
+#endif
+ if (tp->snd_una != tp->snd_max) {
+ /* Create a send map for the current outstanding data */
+ struct bbr_sendmap *rsm;
+
+ rsm = bbr_alloc(bbr);
+ if (rsm == NULL) {
+ uma_zfree(bbr_pcb_zone, tp->t_fb_ptr);
+ tp->t_fb_ptr = NULL;
+ return (ENOMEM);
+ }
+ rsm->r_flags = BBR_OVERMAX;
+ rsm->r_tim_lastsent[0] = cts;
+ rsm->r_rtr_cnt = 1;
+ rsm->r_rtr_bytes = 0;
+ rsm->r_start = tp->snd_una;
+ rsm->r_end = tp->snd_max;
+ rsm->r_dupack = 0;
+ rsm->r_delivered = bbr->r_ctl.rc_delivered;
+ rsm->r_ts_valid = 0;
+ rsm->r_del_ack_ts = tp->ts_recent;
+ rsm->r_del_time = cts;
+ if (bbr->r_ctl.r_app_limited_until)
+ rsm->r_app_limited = 1;
+ else
+ rsm->r_app_limited = 0;
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next);
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 1;
+ if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW)
+ rsm->r_bbr_state = bbr_state_val(bbr);
+ else
+ rsm->r_bbr_state = 8;
+ }
+ if (bbr_use_rack_resend_cheat && (bbr->rc_use_google == 0))
+ bbr->bbr_use_rack_cheat = 1;
+ if (bbr_incr_timers && (bbr->rc_use_google == 0))
+ bbr->r_ctl.rc_incr_tmrs = 1;
+ if (bbr_include_tcp_oh && (bbr->rc_use_google == 0))
+ bbr->r_ctl.rc_inc_tcp_oh = 1;
+ if (bbr_include_ip_oh && (bbr->rc_use_google == 0))
+ bbr->r_ctl.rc_inc_ip_oh = 1;
+ if (bbr_include_enet_oh && (bbr->rc_use_google == 0))
+ bbr->r_ctl.rc_inc_enet_oh = 1;
+
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ if (TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->t_srtt)) {
+ uint32_t rtt;
+
+ rtt = (TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT);
+ apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts);
+ }
+ /* announce the settings and state */
+ bbr_log_settings_change(bbr, BBR_RECOVERY_LOWRTT);
+ tcp_bbr_tso_size_check(bbr, cts);
+ /*
+ * Now call the generic function to start a timer. This will place
+ * the TCB on the hptsi wheel if a timer is needed with appropriate
+ * flags.
+ */
+ bbr_stop_all_timers(tp);
+ bbr_start_hpts_timer(bbr, tp, cts, 5, 0, 0);
+ return (0);
+}
+
+/*
+ * Return 0 if we can accept the connection. Return
+ * non-zero if we can't handle the connection. A EAGAIN
+ * means you need to wait until the connection is up.
+ * a EADDRNOTAVAIL means we can never handle the connection
+ * (no SACK).
+ */
+static int
+bbr_handoff_ok(struct tcpcb *tp)
+{
+ if ((tp->t_state == TCPS_CLOSED) ||
+ (tp->t_state == TCPS_LISTEN)) {
+ /* Sure no problem though it may not stick */
+ return (0);
+ }
+ if ((tp->t_state == TCPS_SYN_SENT) ||
+ (tp->t_state == TCPS_SYN_RECEIVED)) {
+ /*
+ * We really don't know you have to get to ESTAB or beyond
+ * to tell.
+ */
+ return (EAGAIN);
+ }
+ if ((tp->t_flags & TF_SACK_PERMIT) || bbr_sack_not_required) {
+ return (0);
+ }
+ /*
+ * If we reach here we don't do SACK on this connection so we can
+ * never do rack.
+ */
+ return (EINVAL);
+}
+
+static void
+bbr_fini(struct tcpcb *tp, int32_t tcb_is_purged)
+{
+ if (tp->t_fb_ptr) {
+ uint32_t calc;
+ struct tcp_bbr *bbr;
+ struct bbr_sendmap *rsm;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ if (bbr->r_ctl.crte)
+ tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp);
+ bbr_log_flowend(bbr);
+ bbr->rc_tp = NULL;
+ if (tp->t_inpcb) {
+ /* Backout any flags2 we applied */
+ tp->t_inpcb->inp_flags2 &= ~INP_CANNOT_DO_ECN;
+ tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
+ tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
+ }
+ if (bbr->bbr_hdrw_pacing)
+ counter_u64_add(bbr_flows_whdwr_pacing, -1);
+ else
+ counter_u64_add(bbr_flows_nohdwr_pacing, -1);
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ while (rsm) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next);
+ uma_zfree(bbr_zone, rsm);
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ }
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free);
+ while (rsm) {
+ TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next);
+ uma_zfree(bbr_zone, rsm);
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free);
+ }
+ calc = bbr->r_ctl.rc_high_rwnd - bbr->r_ctl.rc_init_rwnd;
+ if (calc > (bbr->r_ctl.rc_init_rwnd / 10))
+ BBR_STAT_INC(bbr_dynamic_rwnd);
+ else
+ BBR_STAT_INC(bbr_static_rwnd);
+ bbr->r_ctl.rc_free_cnt = 0;
+ uma_zfree(bbr_pcb_zone, tp->t_fb_ptr);
+ tp->t_fb_ptr = NULL;
+ }
+ /* Make sure snd_nxt is correctly set */
+ tp->snd_nxt = tp->snd_max;
+}
+
+static void
+bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win)
+{
+ switch (tp->t_state) {
+ case TCPS_SYN_SENT:
+ bbr->r_state = TCPS_SYN_SENT;
+ bbr->r_substate = bbr_do_syn_sent;
+ break;
+ case TCPS_SYN_RECEIVED:
+ bbr->r_state = TCPS_SYN_RECEIVED;
+ bbr->r_substate = bbr_do_syn_recv;
+ break;
+ case TCPS_ESTABLISHED:
+ bbr->r_ctl.rc_init_rwnd = max(win, bbr->rc_tp->snd_wnd);
+ bbr->r_state = TCPS_ESTABLISHED;
+ bbr->r_substate = bbr_do_established;
+ break;
+ case TCPS_CLOSE_WAIT:
+ bbr->r_state = TCPS_CLOSE_WAIT;
+ bbr->r_substate = bbr_do_close_wait;
+ break;
+ case TCPS_FIN_WAIT_1:
+ bbr->r_state = TCPS_FIN_WAIT_1;
+ bbr->r_substate = bbr_do_fin_wait_1;
+ break;
+ case TCPS_CLOSING:
+ bbr->r_state = TCPS_CLOSING;
+ bbr->r_substate = bbr_do_closing;
+ break;
+ case TCPS_LAST_ACK:
+ bbr->r_state = TCPS_LAST_ACK;
+ bbr->r_substate = bbr_do_lastack;
+ break;
+ case TCPS_FIN_WAIT_2:
+ bbr->r_state = TCPS_FIN_WAIT_2;
+ bbr->r_substate = bbr_do_fin_wait_2;
+ break;
+ case TCPS_LISTEN:
+ case TCPS_CLOSED:
+ case TCPS_TIME_WAIT:
+ default:
+ break;
+ };
+}
+
+static void
+bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int32_t line, int dolog)
+{
+ /*
+ * Now what state are we going into now? Is there adjustments
+ * needed?
+ */
+ int32_t old_state, old_gain;
+
+
+ old_state = bbr_state_val(bbr);
+ old_gain = bbr->r_ctl.rc_bbr_hptsi_gain;
+ if (bbr_state_val(bbr) == BBR_SUB_LEVEL1) {
+ /* Save the lowest srtt we saw in our end of the sub-state */
+ bbr->rc_hit_state_1 = 0;
+ if (bbr->r_ctl.bbr_smallest_srtt_this_state != 0xffffffff)
+ bbr->r_ctl.bbr_smallest_srtt_state2 = bbr->r_ctl.bbr_smallest_srtt_this_state;
+ }
+ bbr->rc_bbr_substate++;
+ if (bbr->rc_bbr_substate >= BBR_SUBSTATE_COUNT) {
+ /* Cycle back to first state-> gain */
+ bbr->rc_bbr_substate = 0;
+ }
+ if (bbr_state_val(bbr) == BBR_SUB_GAIN) {
+ /*
+ * We enter the gain(5/4) cycle (possibly less if
+ * shallow buffer detection is enabled)
+ */
+ if (bbr->skip_gain) {
+ /*
+ * Hardware pacing has set our rate to
+ * the max and limited our b/w just
+ * do level i.e. no gain.
+ */
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_LEVEL1];
+ } else if (bbr->gain_is_limited &&
+ bbr->bbr_hdrw_pacing &&
+ bbr->r_ctl.crte) {
+ /*
+ * We can't gain above the hardware pacing
+ * rate which is less than our rate + the gain
+ * calculate the gain needed to reach the hardware
+ * pacing rate..
+ */
+ uint64_t bw, rate, gain_calc;
+
+ bw = bbr_get_bw(bbr);
+ rate = bbr->r_ctl.crte->rate;
+ if ((rate > bw) &&
+ (((bw * (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]) / (uint64_t)BBR_UNIT) > rate)) {
+ gain_calc = (rate * BBR_UNIT) / bw;
+ if (gain_calc < BBR_UNIT)
+ gain_calc = BBR_UNIT;
+ bbr->r_ctl.rc_bbr_hptsi_gain = (uint16_t)gain_calc;
+ } else {
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN];
+ }
+ } else
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN];
+ if ((bbr->rc_use_google == 0) && (bbr_gain_to_target == 0)) {
+ bbr->r_ctl.rc_bbr_state_atflight = cts;
+ } else
+ bbr->r_ctl.rc_bbr_state_atflight = 0;
+ } else if (bbr_state_val(bbr) == BBR_SUB_DRAIN) {
+ bbr->rc_hit_state_1 = 1;
+ bbr->r_ctl.rc_exta_time_gd = 0;
+ bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ if (bbr_state_drain_2_tar) {
+ bbr->r_ctl.rc_bbr_state_atflight = 0;
+ } else
+ bbr->r_ctl.rc_bbr_state_atflight = cts;
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_DRAIN];
+ } else {
+ /* All other cycles hit here 2-7 */
+ if ((old_state == BBR_SUB_DRAIN) && bbr->rc_hit_state_1) {
+ if (bbr_sub_drain_slam_cwnd &&
+ (bbr->rc_use_google == 0) &&
+ (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) {
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ if ((cts - bbr->r_ctl.rc_bbr_state_time) > bbr_get_rtt(bbr, BBR_RTT_PROP))
+ bbr->r_ctl.rc_exta_time_gd += ((cts - bbr->r_ctl.rc_bbr_state_time) -
+ bbr_get_rtt(bbr, BBR_RTT_PROP));
+ else
+ bbr->r_ctl.rc_exta_time_gd = 0;
+ if (bbr->r_ctl.rc_exta_time_gd) {
+ bbr->r_ctl.rc_level_state_extra = bbr->r_ctl.rc_exta_time_gd;
+ /* Now chop up the time for each state (div by 7) */
+ bbr->r_ctl.rc_level_state_extra /= 7;
+ if (bbr_rand_ot && bbr->r_ctl.rc_level_state_extra) {
+ /* Add a randomization */
+ bbr_randomize_extra_state_time(bbr);
+ }
+ }
+ }
+ bbr->r_ctl.rc_bbr_state_atflight = max(1, cts);
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[bbr_state_val(bbr)];
+ }
+ if (bbr->rc_use_google) {
+ bbr->r_ctl.rc_bbr_state_atflight = max(1, cts);
+ }
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain;
+ if (dolog)
+ bbr_log_type_statechange(bbr, cts, line);
+
+ if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+ uint32_t time_in;
+
+ time_in = cts - bbr->r_ctl.rc_bbr_state_time;
+ if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) {
+ counter_u64_add(bbr_state_time[(old_state + 5)], time_in);
+ } else {
+ counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in);
+ }
+ }
+ bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff;
+ bbr_set_state_target(bbr, __LINE__);
+ if (bbr_sub_drain_slam_cwnd &&
+ (bbr->rc_use_google == 0) &&
+ (bbr_state_val(bbr) == BBR_SUB_DRAIN)) {
+ /* Slam down the cwnd */
+ bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd;
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state;
+ if (bbr_sub_drain_app_limit) {
+ /* Go app limited if we are on a long drain */
+ bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered +
+ ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)));
+ }
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ if (bbr->rc_lt_use_bw) {
+ /* In policed mode we clamp pacing_gain to BBR_UNIT */
+ bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT;
+ }
+ /* Google changes TSO size every cycle */
+ if (bbr->rc_use_google)
+ tcp_bbr_tso_size_check(bbr, cts);
+ bbr->r_ctl.gain_epoch = cts;
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ bbr->r_ctl.substate_pe = bbr->r_ctl.rc_pkt_epoch;
+}
+
+static void
+bbr_set_probebw_google_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses)
+{
+ if ((bbr_state_val(bbr) == BBR_SUB_DRAIN) &&
+ (google_allow_early_out == 1) &&
+ (bbr->r_ctl.rc_flight_at_input <= bbr->r_ctl.rc_target_at_state)) {
+ /* We have reached out target flight size possibly early */
+ goto change_state;
+ }
+ if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+ return;
+ }
+ if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_get_rtt(bbr, BBR_RTT_PROP)) {
+ /*
+ * Must be a rttProp movement forward before
+ * we can change states.
+ */
+ return;
+ }
+ if (bbr_state_val(bbr) == BBR_SUB_GAIN) {
+ /*
+ * The needed time has passed but for
+ * the gain cycle extra rules apply:
+ * 1) If we have seen loss, we exit
+ * 2) If we have not reached the target
+ * we stay in GAIN (gain-to-target).
+ */
+ if (google_consider_lost && losses)
+ goto change_state;
+ if (bbr->r_ctl.rc_target_at_state > bbr->r_ctl.rc_flight_at_input) {
+ return;
+ }
+ }
+change_state:
+ /* For gain we must reach our target, all others last 1 rttProp */
+ bbr_substate_change(bbr, cts, __LINE__, 1);
+}
+
+static void
+bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses)
+{
+ uint32_t flight, bbr_cur_cycle_time;
+
+ if (bbr->rc_use_google) {
+ bbr_set_probebw_google_gains(bbr, cts, losses);
+ return;
+ }
+ if (cts == 0) {
+ /*
+ * Never alow cts to be 0 we
+ * do this so we can judge if
+ * we have set a timestamp.
+ */
+ cts = 1;
+ }
+ if (bbr_state_is_pkt_epoch)
+ bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PKTRTT);
+ else
+ bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PROP);
+
+ if (bbr->r_ctl.rc_bbr_state_atflight == 0) {
+ if (bbr_state_val(bbr) == BBR_SUB_DRAIN) {
+ flight = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ if (bbr_sub_drain_slam_cwnd && bbr->rc_hit_state_1) {
+ /* Keep it slam down */
+ if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state) {
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ if (bbr_sub_drain_app_limit) {
+ /* Go app limited if we are on a long drain */
+ bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + flight);
+ }
+ }
+ if (TSTMP_GT(cts, bbr->r_ctl.gain_epoch) &&
+ (((cts - bbr->r_ctl.gain_epoch) > bbr_get_rtt(bbr, BBR_RTT_PROP)) ||
+ (flight >= bbr->r_ctl.flightsize_at_drain))) {
+ /*
+ * Still here after the same time as
+ * the gain. We need to drain harder
+ * for the next srtt. Reduce by a set amount
+ * the gain drop is capped at DRAIN states
+ * value (88).
+ */
+ bbr->r_ctl.flightsize_at_drain = flight;
+ if (bbr_drain_drop_mul &&
+ bbr_drain_drop_div &&
+ (bbr_drain_drop_mul < bbr_drain_drop_div)) {
+ /* Use your specific drop value (def 4/5 = 20%) */
+ bbr->r_ctl.rc_bbr_hptsi_gain *= bbr_drain_drop_mul;
+ bbr->r_ctl.rc_bbr_hptsi_gain /= bbr_drain_drop_div;
+ } else {
+ /* You get drop of 20% */
+ bbr->r_ctl.rc_bbr_hptsi_gain *= 4;
+ bbr->r_ctl.rc_bbr_hptsi_gain /= 5;
+ }
+ if (bbr->r_ctl.rc_bbr_hptsi_gain <= bbr_drain_floor) {
+ /* Reduce our gain again to the bottom */
+ bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1);
+ }
+ bbr_log_exit_gain(bbr, cts, 4);
+ /*
+ * Extend out so we wait another
+ * epoch before dropping again.
+ */
+ bbr->r_ctl.gain_epoch = cts;
+ }
+ if (flight <= bbr->r_ctl.rc_target_at_state) {
+ if (bbr_sub_drain_slam_cwnd &&
+ (bbr->rc_use_google == 0) &&
+ (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) {
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1);
+ bbr_log_exit_gain(bbr, cts, 3);
+ }
+ } else {
+ /* Its a gain */
+ if (bbr->r_ctl.rc_lost > bbr->r_ctl.bbr_lost_at_state) {
+ bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1);
+ goto change_state;
+ }
+ if ((ctf_outstanding(bbr->rc_tp) >= bbr->r_ctl.rc_target_at_state) ||
+ ((ctf_outstanding(bbr->rc_tp) + bbr->rc_tp->t_maxseg - 1) >=
+ bbr->rc_tp->snd_wnd)) {
+ bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1);
+ bbr_log_exit_gain(bbr, cts, 2);
+ }
+ }
+ /**
+ * We fall through and return always one of two things has
+ * occured.
+ * 1) We are still not at target
+ * <or>
+ * 2) We reached the target and set rc_bbr_state_atflight
+ * which means we no longer hit this block
+ * next time we are called.
+ */
+ return;
+ }
+change_state:
+ if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time))
+ return;
+ if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_cur_cycle_time) {
+ /* Less than a full time-period has passed */
+ return;
+ }
+ if (bbr->r_ctl.rc_level_state_extra &&
+ (bbr_state_val(bbr) > BBR_SUB_DRAIN) &&
+ ((cts - bbr->r_ctl.rc_bbr_state_time) <
+ (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) {
+ /* Less than a full time-period + extra has passed */
+ return;
+ }
+ if (bbr_gain_gets_extra_too &&
+ bbr->r_ctl.rc_level_state_extra &&
+ (bbr_state_val(bbr) == BBR_SUB_GAIN) &&
+ ((cts - bbr->r_ctl.rc_bbr_state_time) <
+ (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) {
+ /* Less than a full time-period + extra has passed */
+ return;
+ }
+ bbr_substate_change(bbr, cts, __LINE__, 1);
+}
+
+static uint32_t
+bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain)
+{
+ uint32_t mss, tar;
+
+ if (bbr->rc_use_google) {
+ /* Google just uses the cwnd target */
+ tar = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), gain);
+ } else {
+ mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options),
+ bbr->r_ctl.rc_pace_max_segs);
+ /* Get the base cwnd with gain rounded to a mss */
+ tar = roundup(bbr_get_raw_target_cwnd(bbr, bbr_get_bw(bbr),
+ gain), mss);
+ /* Make sure it is within our min */
+ if (tar < get_min_cwnd(bbr))
+ return (get_min_cwnd(bbr));
+ }
+ return (tar);
+}
+
+static void
+bbr_set_state_target(struct tcp_bbr *bbr, int line)
+{
+ uint32_t tar, meth;
+
+ if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) &&
+ ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) {
+ /* Special case using old probe-rtt method */
+ tar = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options);
+ meth = 1;
+ } else {
+ /* Non-probe-rtt case and reduced probe-rtt */
+ if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) &&
+ (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT)) {
+ /* For gain cycle we use the hptsi gain */
+ tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain);
+ meth = 2;
+ } else if ((bbr_target_is_bbunit) || bbr->rc_use_google) {
+ /*
+ * If configured, or for google all other states
+ * get BBR_UNIT.
+ */
+ tar = bbr_get_a_state_target(bbr, BBR_UNIT);
+ meth = 3;
+ } else {
+ /*
+ * Or we set a target based on the pacing gain
+ * for non-google mode and default (non-configured).
+ * Note we don't set a target goal below drain (192).
+ */
+ if (bbr->r_ctl.rc_bbr_hptsi_gain < bbr_hptsi_gain[BBR_SUB_DRAIN]) {
+ tar = bbr_get_a_state_target(bbr, bbr_hptsi_gain[BBR_SUB_DRAIN]);
+ meth = 4;
+ } else {
+ tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain);
+ meth = 5;
+ }
+ }
+ }
+ bbr_log_set_of_state_target(bbr, tar, line, meth);
+ bbr->r_ctl.rc_target_at_state = tar;
+}
+
+static void
+bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line)
+{
+ /* Change to probe_rtt */
+ uint32_t time_in;
+
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.flightsize_at_drain
+ + bbr->r_ctl.rc_delivered);
+ /* Setup so we force feed the filter */
+ if (bbr->rc_use_google || bbr_probertt_sets_rtt)
+ bbr->rc_prtt_set_ts = 1;
+ if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+ time_in = cts - bbr->r_ctl.rc_bbr_state_time;
+ counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in);
+ }
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_ENTERPROBE, 0);
+ bbr->r_ctl.rc_rtt_shrinks = cts;
+ bbr->r_ctl.last_in_probertt = cts;
+ bbr->r_ctl.rc_probertt_srttchktim = cts;
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ bbr->rc_bbr_state = BBR_STATE_PROBE_RTT;
+ /* We need to force the filter to update */
+
+ if ((bbr_sub_drain_slam_cwnd) &&
+ bbr->rc_hit_state_1 &&
+ (bbr->rc_use_google == 0) &&
+ (bbr_state_val(bbr) == BBR_SUB_DRAIN)) {
+ if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_saved_cwnd)
+ bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd;
+ } else
+ bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd;
+ /* Update the lost */
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ if ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google){
+ /* Set to the non-configurable default of 4 (PROBE_RTT_MIN) */
+ bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options);
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT;
+ bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT;
+ bbr_log_set_of_state_target(bbr, bbr->rc_tp->snd_cwnd, __LINE__, 6);
+ bbr->r_ctl.rc_target_at_state = bbr->rc_tp->snd_cwnd;
+ } else {
+ /*
+ * We bring it down slowly by using a hptsi gain that is
+ * probably 75%. This will slowly float down our outstanding
+ * without tampering with the cwnd.
+ */
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val;
+ bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT;
+ bbr_set_state_target(bbr, __LINE__);
+ if (bbr_prtt_slam_cwnd &&
+ (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) {
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ }
+ if (ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <=
+ bbr->r_ctl.rc_target_at_state) {
+ /* We are at target */
+ bbr->r_ctl.rc_bbr_enters_probertt = cts;
+ } else {
+ /* We need to come down to reach target before our time begins */
+ bbr->r_ctl.rc_bbr_enters_probertt = 0;
+ }
+ bbr->r_ctl.rc_pe_of_prtt = bbr->r_ctl.rc_pkt_epoch;
+ BBR_STAT_INC(bbr_enter_probertt);
+ bbr_log_exit_gain(bbr, cts, 0);
+ bbr_log_type_statechange(bbr, cts, line);
+}
+
+static void
+bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts)
+{
+ /*
+ * Sanity check on probe-rtt intervals.
+ * In crazy situations where we are competing
+ * against new-reno flows with huge buffers
+ * our rtt-prop interval could come to dominate
+ * things if we can't get through a full set
+ * of cycles, we need to adjust it.
+ */
+ if (bbr_can_adjust_probertt &&
+ (bbr->rc_use_google == 0)) {
+ uint16_t val = 0;
+ uint32_t cur_rttp, fval, newval, baseval;
+
+ /* Are we to small and go into probe-rtt to often? */
+ baseval = (bbr_get_rtt(bbr, BBR_RTT_PROP) * (BBR_SUBSTATE_COUNT + 1));
+ cur_rttp = roundup(baseval, USECS_IN_SECOND);
+ fval = bbr_filter_len_sec * USECS_IN_SECOND;
+ if (bbr_is_ratio == 0) {
+ if (fval > bbr_rtt_probe_limit)
+ newval = cur_rttp + (fval - bbr_rtt_probe_limit);
+ else
+ newval = cur_rttp;
+ } else {
+ int mul;
+
+ mul = fval / bbr_rtt_probe_limit;
+ newval = cur_rttp * mul;
+ }
+ if (cur_rttp > bbr->r_ctl.rc_probertt_int) {
+ bbr->r_ctl.rc_probertt_int = cur_rttp;
+ reset_time_small(&bbr->r_ctl.rc_rttprop, newval);
+ val = 1;
+ } else {
+ /*
+ * No adjustments were made
+ * do we need to shrink it?
+ */
+ if (bbr->r_ctl.rc_probertt_int > bbr_rtt_probe_limit) {
+ if (cur_rttp <= bbr_rtt_probe_limit) {
+ /*
+ * Things have calmed down lets
+ * shrink all the way to default
+ */
+ bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit;
+ reset_time_small(&bbr->r_ctl.rc_rttprop,
+ (bbr_filter_len_sec * USECS_IN_SECOND));
+ cur_rttp = bbr_rtt_probe_limit;
+ newval = (bbr_filter_len_sec * USECS_IN_SECOND);
+ val = 2;
+ } else {
+ /*
+ * Well does some adjustment make sense?
+ */
+ if (cur_rttp < bbr->r_ctl.rc_probertt_int) {
+ /* We can reduce interval time some */
+ bbr->r_ctl.rc_probertt_int = cur_rttp;
+ reset_time_small(&bbr->r_ctl.rc_rttprop, newval);
+ val = 3;
+ }
+ }
+ }
+ }
+ if (val)
+ bbr_log_rtt_shrinks(bbr, cts, cur_rttp, newval, __LINE__, BBR_RTTS_RESETS_VALUES, val);
+ }
+}
+
+static void
+bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts)
+{
+ /* Exit probe-rtt */
+
+ if (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd) {
+ tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ bbr_log_exit_gain(bbr, cts, 1);
+ bbr->rc_hit_state_1 = 0;
+ bbr->r_ctl.rc_rtt_shrinks = cts;
+ bbr->r_ctl.last_in_probertt = cts;
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_RTTPROBE, 0);
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) +
+ bbr->r_ctl.rc_delivered);
+ if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+ uint32_t time_in;
+
+ time_in = cts - bbr->r_ctl.rc_bbr_state_time;
+ counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in);
+ }
+ if (bbr->rc_filled_pipe) {
+ /* Switch to probe_bw */
+ bbr->rc_bbr_state = BBR_STATE_PROBE_BW;
+ bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts);
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain;
+ bbr_substate_change(bbr, cts, __LINE__, 0);
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ } else {
+ /* Back to startup */
+ bbr->rc_bbr_state = BBR_STATE_STARTUP;
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ /*
+ * We don't want to give a complete free 3
+ * measurements until we exit, so we use
+ * the number of pe's we were in probe-rtt
+ * to add to the startup_epoch. That way
+ * we will still retain the old state.
+ */
+ bbr->r_ctl.rc_bbr_last_startup_epoch += (bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_pe_of_prtt);
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ /* Make sure to use the lower pg when shifting back in */
+ if (bbr->r_ctl.rc_lost &&
+ bbr_use_lower_gain_in_startup &&
+ (bbr->rc_use_google == 0))
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower;
+ else
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg;
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg;
+ /* Probably not needed but set it anyway */
+ bbr_set_state_target(bbr, __LINE__);
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 0);
+ }
+ bbr_check_probe_rtt_limits(bbr, cts);
+}
+
+static int32_t inline
+bbr_should_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts)
+{
+ if ((bbr->rc_past_init_win == 1) &&
+ (bbr->rc_in_persist == 0) &&
+ (bbr_calc_time(cts, bbr->r_ctl.rc_rtt_shrinks) >= bbr->r_ctl.rc_probertt_int)) {
+ return (1);
+ }
+ if (bbr_can_force_probertt &&
+ (bbr->rc_in_persist == 0) &&
+ (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) &&
+ ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) {
+ return (1);
+ }
+ return (0);
+}
+
+
+static int32_t
+bbr_google_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t pkt_epoch)
+{
+ uint64_t btlbw, gain;
+ if (pkt_epoch == 0) {
+ /*
+ * Need to be on a pkt-epoch to continue.
+ */
+ return (0);
+ }
+ btlbw = bbr_get_full_bw(bbr);
+ gain = ((bbr->r_ctl.rc_bbr_lastbtlbw *
+ (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw;
+ if (btlbw >= gain) {
+ bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch;
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3);
+ bbr->r_ctl.rc_bbr_lastbtlbw = btlbw;
+ }
+ if ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS)
+ return (1);
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8);
+ return(0);
+}
+
+static int32_t inline
+bbr_state_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch)
+{
+ /* Have we gained 25% in the last 3 packet based epoch's? */
+ uint64_t btlbw, gain;
+ int do_exit;
+ int delta, rtt_gain;
+
+ if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) &&
+ (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) {
+ /*
+ * This qualifies as a RTT_PROBE session since we drop the
+ * data outstanding to nothing and waited more than
+ * bbr_rtt_probe_time.
+ */
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0);
+ bbr_set_reduced_rtt(bbr, cts, __LINE__);
+ }
+ if (bbr_should_enter_probe_rtt(bbr, cts)) {
+ bbr_enter_probe_rtt(bbr, cts, __LINE__);
+ return (0);
+ }
+ if (bbr->rc_use_google)
+ return (bbr_google_startup(bbr, cts, pkt_epoch));
+
+ if ((bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) &&
+ (bbr_use_lower_gain_in_startup)) {
+ /* Drop to a lower gain 1.5 x since we saw loss */
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower;
+ }
+ if (pkt_epoch == 0) {
+ /*
+ * Need to be on a pkt-epoch to continue.
+ */
+ return (0);
+ }
+ if (bbr_rtt_gain_thresh) {
+ /*
+ * Do we allow a flow to stay
+ * in startup with no loss and no
+ * gain in rtt over a set threshold?
+ */
+ if (bbr->r_ctl.rc_pkt_epoch_rtt &&
+ bbr->r_ctl.startup_last_srtt &&
+ (bbr->r_ctl.rc_pkt_epoch_rtt > bbr->r_ctl.startup_last_srtt)) {
+ delta = bbr->r_ctl.rc_pkt_epoch_rtt - bbr->r_ctl.startup_last_srtt;
+ rtt_gain = (delta * 100) / bbr->r_ctl.startup_last_srtt;
+ } else
+ rtt_gain = 0;
+ if ((bbr->r_ctl.startup_last_srtt == 0) ||
+ (bbr->r_ctl.rc_pkt_epoch_rtt < bbr->r_ctl.startup_last_srtt))
+ /* First time or new lower value */
+ bbr->r_ctl.startup_last_srtt = bbr->r_ctl.rc_pkt_epoch_rtt;
+
+ if ((bbr->r_ctl.rc_lost == 0) &&
+ (rtt_gain < bbr_rtt_gain_thresh)) {
+ /*
+ * No loss, and we are under
+ * our gain threhold for
+ * increasing RTT.
+ */
+ if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch)
+ bbr->r_ctl.rc_bbr_last_startup_epoch++;
+ bbr_log_startup_event(bbr, cts, rtt_gain,
+ delta, bbr->r_ctl.startup_last_srtt, 10);
+ return (0);
+ }
+ }
+ if ((bbr->r_ctl.r_measurement_count == bbr->r_ctl.last_startup_measure) &&
+ (bbr->r_ctl.rc_lost_at_startup == bbr->r_ctl.rc_lost) &&
+ (!IN_RECOVERY(bbr->rc_tp->t_flags))) {
+ /*
+ * We only assess if we have a new measurment when
+ * we have no loss and are not in recovery.
+ * Drag up by one our last_startup epoch so we will hold
+ * the number of non-gain we have already accumulated.
+ */
+ if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch)
+ bbr->r_ctl.rc_bbr_last_startup_epoch++;
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 9);
+ return (0);
+ }
+ /* Case where we reduced the lost (bad retransmit) */
+ if (bbr->r_ctl.rc_lost_at_startup > bbr->r_ctl.rc_lost)
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ bbr->r_ctl.last_startup_measure = bbr->r_ctl.r_measurement_count;
+ btlbw = bbr_get_full_bw(bbr);
+ if (bbr->r_ctl.rc_bbr_hptsi_gain == bbr_startup_lower)
+ gain = ((bbr->r_ctl.rc_bbr_lastbtlbw *
+ (uint64_t)bbr_low_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw;
+ else
+ gain = ((bbr->r_ctl.rc_bbr_lastbtlbw *
+ (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw;
+ do_exit = 0;
+ if (btlbw > bbr->r_ctl.rc_bbr_lastbtlbw)
+ bbr->r_ctl.rc_bbr_lastbtlbw = btlbw;
+ if (btlbw >= gain) {
+ bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch;
+ /* Update the lost so we won't exit in next set of tests */
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3);
+ }
+ if ((bbr->rc_loss_exit &&
+ (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) &&
+ (bbr->r_ctl.rc_pkt_epoch_loss_rate > bbr_startup_loss_thresh)) &&
+ ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS)) {
+ /*
+ * If we had no gain, we had loss and that loss was above
+ * our threshould, the rwnd is not constrained, and we have
+ * had at least 3 packet epochs exit. Note that this is
+ * switched off by sysctl. Google does not do this by the
+ * way.
+ */
+ if ((ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) +
+ (2 * max(bbr->r_ctl.rc_pace_max_segs, bbr->rc_tp->t_maxseg))) <= bbr->rc_tp->snd_wnd) {
+ do_exit = 1;
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 4);
+ } else {
+ /* Just record an updated loss value */
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 5);
+ }
+ } else
+ bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost;
+ if (((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) ||
+ do_exit) {
+ /* Return 1 to exit the startup state. */
+ return (1);
+ }
+ /* Stay in startup */
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8);
+ return (0);
+}
+
+static void
+bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch, uint32_t losses)
+{
+ /*
+ * A tick occured in the rtt epoch do we need to do anything?
+ */
+#ifdef BBR_INVARIANTS
+ if ((bbr->rc_bbr_state != BBR_STATE_STARTUP) &&
+ (bbr->rc_bbr_state != BBR_STATE_DRAIN) &&
+ (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) &&
+ (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) &&
+ (bbr->rc_bbr_state != BBR_STATE_PROBE_BW)) {
+ /* Debug code? */
+ panic("Unknown BBR state %d?\n", bbr->rc_bbr_state);
+ }
+#endif
+ if (bbr->rc_bbr_state == BBR_STATE_STARTUP) {
+ /* Do we exit the startup state? */
+ if (bbr_state_startup(bbr, cts, epoch, pkt_epoch)) {
+ uint32_t time_in;
+
+ bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch,
+ bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 6);
+ bbr->rc_filled_pipe = 1;
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+
+ time_in = cts - bbr->r_ctl.rc_bbr_state_time;
+ counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in);
+ } else
+ time_in = 0;
+ if (bbr->rc_no_pacing)
+ bbr->rc_no_pacing = 0;
+ bbr->r_ctl.rc_bbr_state_time = cts;
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_drain_pg;
+ bbr->rc_bbr_state = BBR_STATE_DRAIN;
+ bbr_set_state_target(bbr, __LINE__);
+ if ((bbr->rc_use_google == 0) &&
+ bbr_slam_cwnd_in_main_drain) {
+ /* Here we don't have to worry about probe-rtt */
+ bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd;
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain;
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ if (ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <=
+ bbr->r_ctl.rc_target_at_state) {
+ /*
+ * Switch to probe_bw if we are already
+ * there
+ */
+ bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts);
+ bbr_substate_change(bbr, cts, __LINE__, 0);
+ bbr->rc_bbr_state = BBR_STATE_PROBE_BW;
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ }
+ }
+ } else if (bbr->rc_bbr_state == BBR_STATE_IDLE_EXIT) {
+ uint32_t inflight;
+ struct tcpcb *tp;
+
+ tp = bbr->rc_tp;
+ inflight = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ if (inflight >= bbr->r_ctl.rc_target_at_state) {
+ /* We have reached a flight of the cwnd target */
+ bbr->rc_bbr_state = BBR_STATE_PROBE_BW;
+ bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT;
+ bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT;
+ bbr_set_state_target(bbr, __LINE__);
+ /*
+ * Rig it so we don't do anything crazy and
+ * start fresh with a new randomization.
+ */
+ bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff;
+ bbr->rc_bbr_substate = BBR_SUB_LEVEL6;
+ bbr_substate_change(bbr, cts, __LINE__, 1);
+ }
+ } else if (bbr->rc_bbr_state == BBR_STATE_DRAIN) {
+ /* Has in-flight reached the bdp (or less)? */
+ uint32_t inflight;
+ struct tcpcb *tp;
+
+ tp = bbr->rc_tp;
+ inflight = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ if ((bbr->rc_use_google == 0) &&
+ bbr_slam_cwnd_in_main_drain &&
+ (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) {
+ /*
+ * Here we don't have to worry about probe-rtt
+ * re-slam it, but keep it slammed down.
+ */
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ if (inflight <= bbr->r_ctl.rc_target_at_state) {
+ /* We have drained */
+ bbr->rc_bbr_state = BBR_STATE_PROBE_BW;
+ bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
+ if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) {
+ uint32_t time_in;
+
+ time_in = cts - bbr->r_ctl.rc_bbr_state_time;
+ counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in);
+ }
+ if ((bbr->rc_use_google == 0) &&
+ bbr_slam_cwnd_in_main_drain &&
+ (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) {
+ /* Restore the cwnd */
+ tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ /* Setup probe-rtt has being done now RRS-HERE */
+ bbr->r_ctl.rc_rtt_shrinks = cts;
+ bbr->r_ctl.last_in_probertt = cts;
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_LEAVE_DRAIN, 0);
+ /* Randomly pick a sub-state */
+ bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts);
+ bbr_substate_change(bbr, cts, __LINE__, 0);
+ bbr_log_type_statechange(bbr, cts, __LINE__);
+ }
+ } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) {
+ uint32_t flight;
+
+ flight = ctf_flight_size(bbr->rc_tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ bbr->r_ctl.r_app_limited_until = (flight + bbr->r_ctl.rc_delivered);
+ if (((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google) &&
+ (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) {
+ /*
+ * We must keep cwnd at the desired MSS.
+ */
+ bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options);
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ } else if ((bbr_prtt_slam_cwnd) &&
+ (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) {
+ /* Re-slam it */
+ bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__);
+ }
+ if (bbr->r_ctl.rc_bbr_enters_probertt == 0) {
+ /* Has outstanding reached our target? */
+ if (flight <= bbr->r_ctl.rc_target_at_state) {
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_REACHTAR, 0);
+ bbr->r_ctl.rc_bbr_enters_probertt = cts;
+ /* If time is exactly 0, be 1usec off */
+ if (bbr->r_ctl.rc_bbr_enters_probertt == 0)
+ bbr->r_ctl.rc_bbr_enters_probertt = 1;
+ if (bbr->rc_use_google == 0) {
+ /*
+ * Restore any lowering that as occured to
+ * reach here
+ */
+ if (bbr->r_ctl.bbr_rttprobe_gain_val)
+ bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val;
+ else
+ bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT;
+ }
+ }
+ if ((bbr->r_ctl.rc_bbr_enters_probertt == 0) &&
+ (bbr->rc_use_google == 0) &&
+ bbr->r_ctl.bbr_rttprobe_gain_val &&
+ (((cts - bbr->r_ctl.rc_probertt_srttchktim) > bbr_get_rtt(bbr, bbr_drain_rtt)) ||
+ (flight >= bbr->r_ctl.flightsize_at_drain))) {
+ /*
+ * We have doddled with our current hptsi
+ * gain an srtt and have still not made it
+ * to target, or we have increased our flight.
+ * Lets reduce the gain by xx%
+ * flooring the reduce at DRAIN (based on
+ * mul/div)
+ */
+ int red;
+
+ bbr->r_ctl.flightsize_at_drain = flight;
+ bbr->r_ctl.rc_probertt_srttchktim = cts;
+ red = max((bbr->r_ctl.bbr_rttprobe_gain_val / 10), 1);
+ if ((bbr->r_ctl.rc_bbr_hptsi_gain - red) > max(bbr_drain_floor, 1)) {
+ /* Reduce our gain again */
+ bbr->r_ctl.rc_bbr_hptsi_gain -= red;
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG, 0);
+ } else if (bbr->r_ctl.rc_bbr_hptsi_gain > max(bbr_drain_floor, 1)) {
+ /* one more chance before we give up */
+ bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1);
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG_FINAL, 0);
+ } else {
+ /* At the very bottom */
+ bbr->r_ctl.rc_bbr_hptsi_gain = max((bbr_drain_floor-1), 1);
+ }
+ }
+ }
+ if (bbr->r_ctl.rc_bbr_enters_probertt &&
+ (TSTMP_GT(cts, bbr->r_ctl.rc_bbr_enters_probertt)) &&
+ ((cts - bbr->r_ctl.rc_bbr_enters_probertt) >= bbr_rtt_probe_time)) {
+ /* Time to exit probe RTT normally */
+ bbr_exit_probe_rtt(bbr->rc_tp, bbr, cts);
+ }
+ } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) {
+ if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) &&
+ (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) {
+ /*
+ * This qualifies as a RTT_PROBE session since we
+ * drop the data outstanding to nothing and waited
+ * more than bbr_rtt_probe_time.
+ */
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0);
+ bbr_set_reduced_rtt(bbr, cts, __LINE__);
+ }
+ if (bbr_should_enter_probe_rtt(bbr, cts)) {
+ bbr_enter_probe_rtt(bbr, cts, __LINE__);
+ } else {
+ bbr_set_probebw_gains(bbr, cts, losses);
+ }
+ }
+}
+
+static void
+bbr_check_bbr_for_state(struct tcp_bbr *bbr, uint32_t cts, int32_t line, uint32_t losses)
+{
+ int32_t epoch = 0;
+
+ if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) {
+ bbr_set_epoch(bbr, cts, line);
+ /* At each epoch doe lt bw sampling */
+ epoch = 1;
+ }
+ bbr_state_change(bbr, cts, epoch, bbr->rc_is_pkt_epoch_now, losses);
+}
+
+static int
+bbr_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos,
+ int32_t nxt_pkt, struct timeval *tv)
+{
+ int32_t thflags, retval;
+ uint32_t cts, lcts;
+ uint32_t tiwin;
+ struct tcpopt to;
+ struct tcp_bbr *bbr;
+ struct bbr_sendmap *rsm;
+ struct timeval ltv;
+ int32_t did_out = 0;
+ int32_t in_recovery;
+ uint16_t nsegs;
+ int32_t prev_state;
+ uint32_t lost;
+
+ nsegs = max(1, m->m_pkthdr.lro_nsegs);
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ /* add in our stats */
+ kern_prefetch(bbr, &prev_state);
+ prev_state = 0;
+ thflags = th->th_flags;
+ /*
+ * If this is either a state-changing packet or current state isn't
+ * established, we require a write lock on tcbinfo. Otherwise, we
+ * allow the tcbinfo to be in either alocked or unlocked, as the
+ * caller may have unnecessarily acquired a write lock due to a
+ * race.
+ */
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN",
+ __func__));
+ KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT",
+ __func__));
+
+ tp->t_rcvtime = ticks;
+ /*
+ * Unscale the window into a 32-bit value. For the SYN_SENT state
+ * the scale is zero.
+ */
+ tiwin = th->th_win << tp->snd_scale;
+#ifdef NETFLIX_STATS
+ stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin);
+#endif
+ /*
+ * Parse options on any incoming segment.
+ */
+ tcp_dooptions(&to, (u_char *)(th + 1),
+ (th->th_off << 2) - sizeof(struct tcphdr),
+ (thflags & TH_SYN) ? TO_SYN : 0);
+
+ if (m->m_flags & M_TSTMP) {
+ /* Prefer the hardware timestamp if present */
+ struct timespec ts;
+
+ mbuf_tstmp2timespec(m, &ts);
+ bbr->rc_tv.tv_sec = ts.tv_sec;
+ bbr->rc_tv.tv_usec = ts.tv_nsec / 1000;
+ bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv);
+ } else if (m->m_flags & M_TSTMP_LRO) {
+ /* Next the arrival timestamp */
+ struct timespec ts;
+
+ mbuf_tstmp2timespec(m, &ts);
+ bbr->rc_tv.tv_sec = ts.tv_sec;
+ bbr->rc_tv.tv_usec = ts.tv_nsec / 1000;
+ bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv);
+ } else {
+ /*
+ * Ok just get the current time.
+ */
+ bbr->r_ctl.rc_rcvtime = lcts = cts = tcp_get_usecs(&bbr->rc_tv);
+ }
+ /*
+ * If echoed timestamp is later than the current time, fall back to
+ * non RFC1323 RTT calculation. Normalize timestamp if syncookies
+ * were used when this connection was established.
+ */
+ if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) {
+ to.to_tsecr -= tp->ts_offset;
+ if (TSTMP_GT(to.to_tsecr, tcp_tv_to_mssectick(&bbr->rc_tv)))
+ to.to_tsecr = 0;
+ }
+ /*
+ * If its the first time in we need to take care of options and
+ * verify we can do SACK for rack!
+ */
+ if (bbr->r_state == 0) {
+ /*
+ * Process options only when we get SYN/ACK back. The SYN
+ * case for incoming connections is handled in tcp_syncache.
+ * According to RFC1323 the window field in a SYN (i.e., a
+ * <SYN> or <SYN,ACK>) segment itself is never scaled. XXX
+ * this is traditional behavior, may need to be cleaned up.
+ */
+ if (bbr->rc_inp == NULL) {
+ bbr->rc_inp = tp->t_inpcb;
+ }
+ /*
+ * We need to init rc_inp here since its not init'd when
+ * bbr_init is called
+ */
+ if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {
+ if ((to.to_flags & TOF_SCALE) &&
+ (tp->t_flags & TF_REQ_SCALE)) {
+ tp->t_flags |= TF_RCVD_SCALE;
+ tp->snd_scale = to.to_wscale;
+ }
+ /*
+ * Initial send window. It will be updated with the
+ * next incoming segment to the scaled value.
+ */
+ tp->snd_wnd = th->th_win;
+ if (to.to_flags & TOF_TS) {
+ tp->t_flags |= TF_RCVD_TSTMP;
+ tp->ts_recent = to.to_tsval;
+ tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv);
+ }
+ if (to.to_flags & TOF_MSS)
+ tcp_mss(tp, to.to_mss);
+ if ((tp->t_flags & TF_SACK_PERMIT) &&
+ (to.to_flags & TOF_SACKPERM) == 0)
+ tp->t_flags &= ~TF_SACK_PERMIT;
+ if (IS_FASTOPEN(tp->t_flags)) {
+ if (to.to_flags & TOF_FASTOPEN) {
+ uint16_t mss;
+
+ if (to.to_flags & TOF_MSS)
+ mss = to.to_mss;
+ else
+ if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0)
+ mss = TCP6_MSS;
+ else
+ mss = TCP_MSS;
+ tcp_fastopen_update_cache(tp, mss,
+ to.to_tfo_len, to.to_tfo_cookie);
+ } else
+ tcp_fastopen_disable_path(tp);
+ }
+ }
+ /*
+ * At this point we are at the initial call. Here we decide
+ * if we are doing RACK or not. We do this by seeing if
+ * TF_SACK_PERMIT is set, if not rack is *not* possible and
+ * we switch to the default code.
+ */
+ if ((tp->t_flags & TF_SACK_PERMIT) == 0) {
+ /* Bail */
+ tcp_switch_back_to_default(tp);
+ (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen,
+ tlen, iptos);
+ return (1);
+ }
+ /* Set the flag */
+ bbr->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0;
+ tcp_set_hpts(tp->t_inpcb);
+ sack_filter_clear(&bbr->r_ctl.bbr_sf, th->th_ack);
+ }
+ if (thflags & TH_ACK) {
+ /* Track ack types */
+ if (to.to_flags & TOF_SACK)
+ BBR_STAT_INC(bbr_acks_with_sacks);
+ else
+ BBR_STAT_INC(bbr_plain_acks);
+ }
+ /*
+ * This is the one exception case where we set the rack state
+ * always. All other times (timers etc) we must have a rack-state
+ * set (so we assure we have done the checks above for SACK).
+ */
+ if (bbr->r_state != tp->t_state)
+ bbr_set_state(tp, bbr, tiwin);
+
+ if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map)) != NULL)
+ kern_prefetch(rsm, &prev_state);
+ prev_state = bbr->r_state;
+ bbr->rc_ack_was_delayed = 0;
+ lost = bbr->r_ctl.rc_lost;
+ bbr->rc_is_pkt_epoch_now = 0;
+ if (m->m_flags & (M_TSTMP|M_TSTMP_LRO)) {
+ /* Get the real time into lcts and figure the real delay */
+ lcts = tcp_get_usecs(&ltv);
+ if (TSTMP_GT(lcts, cts)) {
+ bbr->r_ctl.rc_ack_hdwr_delay = lcts - cts;
+ bbr->rc_ack_was_delayed = 1;
+ if (TSTMP_GT(bbr->r_ctl.rc_ack_hdwr_delay,
+ bbr->r_ctl.highest_hdwr_delay))
+ bbr->r_ctl.highest_hdwr_delay = bbr->r_ctl.rc_ack_hdwr_delay;
+ } else {
+ bbr->r_ctl.rc_ack_hdwr_delay = 0;
+ bbr->rc_ack_was_delayed = 0;
+ }
+ } else {
+ bbr->r_ctl.rc_ack_hdwr_delay = 0;
+ bbr->rc_ack_was_delayed = 0;
+ }
+ bbr_log_ack_event(bbr, th, &to, tlen, nsegs, cts, nxt_pkt, m);
+ if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {
+ retval = 0;
+ m_freem(m);
+ goto done_with_input;
+ }
+ /*
+ * If a segment with the ACK-bit set arrives in the SYN-SENT state
+ * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9.
+ */
+ if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&
+ (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) {
+ ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return (1);
+ }
+ in_recovery = IN_RECOVERY(tp->t_flags);
+ if (tiwin > bbr->r_ctl.rc_high_rwnd)
+ bbr->r_ctl.rc_high_rwnd = tiwin;
+#ifdef BBR_INVARIANTS
+ if ((tp->t_inpcb->inp_flags & INP_DROPPED) ||
+ (tp->t_inpcb->inp_flags2 & INP_FREED)) {
+ panic("tp:%p bbr:%p given a dropped inp:%p",
+ tp, bbr, tp->t_inpcb);
+ }
+#endif
+ bbr->r_ctl.rc_flight_at_input = ctf_flight_size(tp,
+ (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ bbr->rtt_valid = 0;
+ if (to.to_flags & TOF_TS) {
+ bbr->rc_ts_valid = 1;
+ bbr->r_ctl.last_inbound_ts = to.to_tsval;
+ } else {
+ bbr->rc_ts_valid = 0;
+ bbr->r_ctl.last_inbound_ts = 0;
+ }
+ retval = (*bbr->r_substate) (m, th, so,
+ tp, &to, drop_hdrlen,
+ tlen, tiwin, thflags, nxt_pkt);
+#ifdef BBR_INVARIANTS
+ if ((retval == 0) &&
+ (tp->t_inpcb == NULL)) {
+ panic("retval:%d tp:%p t_inpcb:NULL state:%d",
+ retval, tp, prev_state);
+ }
+#endif
+ if (nxt_pkt == 0)
+ BBR_STAT_INC(bbr_rlock_left_ret0);
+ else
+ BBR_STAT_INC(bbr_rlock_left_ret1);
+ if (retval == 0) {
+ /*
+ * If retval is 1 the tcb is unlocked and most likely the tp
+ * is gone.
+ */
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ tcp_bbr_xmit_timer_commit(bbr, tp, cts);
+ if (bbr->rc_is_pkt_epoch_now)
+ bbr_set_pktepoch(bbr, cts, __LINE__);
+ bbr_check_bbr_for_state(bbr, cts, __LINE__, (bbr->r_ctl.rc_lost - lost));
+ if (nxt_pkt == 0) {
+ if (bbr->r_wanted_output != 0) {
+ bbr->rc_output_starts_timer = 0;
+ did_out = 1;
+ (void)tp->t_fb->tfb_tcp_output(tp);
+ } else
+ bbr_start_hpts_timer(bbr, tp, cts, 6, 0, 0);
+ }
+ if ((nxt_pkt == 0) &&
+ ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) &&
+ (SEQ_GT(tp->snd_max, tp->snd_una) ||
+ (tp->t_flags & TF_DELACK) ||
+ ((tcp_always_keepalive || bbr->rc_inp->inp_socket->so_options & SO_KEEPALIVE) &&
+ (tp->t_state <= TCPS_CLOSING)))) {
+ /*
+ * We could not send (probably in the hpts but
+ * stopped the timer)?
+ */
+ if ((tp->snd_max == tp->snd_una) &&
+ ((tp->t_flags & TF_DELACK) == 0) &&
+ (bbr->rc_inp->inp_in_hpts) &&
+ (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
+ /*
+ * keep alive not needed if we are hptsi
+ * output yet
+ */
+ ;
+ } else {
+ if (bbr->rc_inp->inp_in_hpts) {
+ tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT);
+ if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
+ (TSTMP_GT(lcts, bbr->rc_pacer_started))) {
+ uint32_t del;
+
+ del = lcts - bbr->rc_pacer_started;
+ if (del > bbr->r_ctl.rc_last_delay_val) {
+ BBR_STAT_INC(bbr_force_timer_start);
+ bbr->r_ctl.rc_last_delay_val -= del;
+ bbr->rc_pacer_started = lcts;
+ } else {
+ /* We are late */
+ BBR_STAT_INC(bbr_force_output);
+ (void)tp->t_fb->tfb_tcp_output(tp);
+ }
+ }
+ }
+ bbr_start_hpts_timer(bbr, tp, cts, 8, bbr->r_ctl.rc_last_delay_val,
+ 0);
+ }
+ } else if ((bbr->rc_output_starts_timer == 0) && (nxt_pkt == 0)) {
+ /* Do we have the correct timer running? */
+ bbr_timer_audit(tp, bbr, lcts, &so->so_snd);
+ }
+ /* Do we have a new state */
+ if (bbr->r_state != tp->t_state)
+ bbr_set_state(tp, bbr, tiwin);
+done_with_input:
+ bbr_log_doseg_done(bbr, cts, nxt_pkt, did_out);
+ if (did_out)
+ bbr->r_wanted_output = 0;
+#ifdef BBR_INVARIANTS
+ if (tp->t_inpcb == NULL) {
+ panic("OP:%d retval:%d tp:%p t_inpcb:NULL state:%d",
+ did_out,
+ retval, tp, prev_state);
+ }
+#endif
+ }
+ return (retval);
+}
+
+static void
+bbr_log_type_hrdwtso(struct tcpcb *tp, struct tcp_bbr *bbr, int len, int mod, int what_we_can_send)
+{
+ if (tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+ uint32_t cts;
+
+ cts = tcp_get_usecs(&tv);
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ log.u_bbr.flex1 = bbr->r_ctl.rc_pace_min_segs;
+ log.u_bbr.flex2 = what_we_can_send;
+ log.u_bbr.flex3 = bbr->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex4 = len;
+ log.u_bbr.flex5 = 0;
+ log.u_bbr.flex7 = mod;
+ log.u_bbr.flex8 = 1;
+ TCP_LOG_EVENTP(tp, NULL,
+ &tp->t_inpcb->inp_socket->so_rcv,
+ &tp->t_inpcb->inp_socket->so_snd,
+ TCP_HDWR_TLS, 0,
+ 0, &log, false, &tv);
+ }
+}
+
+static void
+bbr_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
+ struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos)
+{
+ struct timeval tv;
+ int retval;
+
+ /* First lets see if we have old packets */
+ if (tp->t_in_pkt) {
+ if (ctf_do_queued_segments(so, tp, 1)) {
+ m_freem(m);
+ return;
+ }
+ }
+ if (m->m_flags & M_TSTMP_LRO) {
+ tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000;
+ tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000;
+ } else {
+ /* Should not be should we kassert instead? */
+ tcp_get_usecs(&tv);
+ }
+ retval = bbr_do_segment_nounlock(m, th, so, tp,
+ drop_hdrlen, tlen, iptos, 0, &tv);
+ if (retval == 0)
+ INP_WUNLOCK(tp->t_inpcb);
+}
+
+/*
+ * Return how much data can be sent without violating the
+ * cwnd or rwnd.
+ */
+
+static inline uint32_t
+bbr_what_can_we_send(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t sendwin,
+ uint32_t avail, int32_t sb_offset, uint32_t cts)
+{
+ uint32_t len;
+
+ if (ctf_outstanding(tp) >= tp->snd_wnd) {
+ /* We never want to go over our peers rcv-window */
+ len = 0;
+ } else {
+ uint32_t flight;
+
+ flight = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes));
+ if (flight >= sendwin) {
+ /*
+ * We have in flight what we are allowed by cwnd (if
+ * it was rwnd blocking it would have hit above out
+ * >= tp->snd_wnd).
+ */
+ return (0);
+ }
+ len = sendwin - flight;
+ if ((len + ctf_outstanding(tp)) > tp->snd_wnd) {
+ /* We would send too much (beyond the rwnd) */
+ len = tp->snd_wnd - ctf_outstanding(tp);
+ }
+ if ((len + sb_offset) > avail) {
+ /*
+ * We don't have that much in the SB, how much is
+ * there?
+ */
+ len = avail - sb_offset;
+ }
+ }
+ return (len);
+}
+
+static inline void
+bbr_do_error_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error)
+{
+#ifdef NETFLIX_STATS
+ TCPSTAT_INC(tcps_sndpack_error);
+ TCPSTAT_ADD(tcps_sndbyte_error, len);
+#endif
+}
+
+static inline void
+bbr_do_send_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error)
+{
+ if (error) {
+ bbr_do_error_accounting(tp, bbr, rsm, len, error);
+ return;
+ }
+ if ((tp->t_flags & TF_FORCEDATA) && len == 1) {
+ /* Window probe */
+ TCPSTAT_INC(tcps_sndprobe);
+#ifdef NETFLIX_STATS
+ stats_voi_update_abs_u32(tp->t_stats,
+ VOI_TCP_RETXPB, len);
+#endif
+ } else if (rsm) {
+ if (rsm->r_flags & BBR_TLP) {
+ /*
+ * TLP should not count in retran count, but in its
+ * own bin
+ */
+#ifdef NETFLIX_STATS
+ tp->t_sndtlppack++;
+ tp->t_sndtlpbyte += len;
+ TCPSTAT_INC(tcps_tlpresends);
+ TCPSTAT_ADD(tcps_tlpresend_bytes, len);
+#endif
+ } else {
+ /* Retransmit */
+ tp->t_sndrexmitpack++;
+ TCPSTAT_INC(tcps_sndrexmitpack);
+ TCPSTAT_ADD(tcps_sndrexmitbyte, len);
+#ifdef NETFLIX_STATS
+ stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB,
+ len);
+#endif
+ }
+ /*
+ * Logs in 0 - 8, 8 is all non probe_bw states 0-7 is
+ * sub-state
+ */
+ counter_u64_add(bbr_state_lost[rsm->r_bbr_state], len);
+ if (bbr->rc_bbr_state != BBR_STATE_PROBE_BW) {
+ /* Non probe_bw log in 1, 2, or 4. */
+ counter_u64_add(bbr_state_resend[bbr->rc_bbr_state], len);
+ } else {
+ /*
+ * Log our probe state 3, and log also 5-13 to show
+ * us the recovery sub-state for the send. This
+ * means that 3 == (5+6+7+8+9+10+11+12+13)
+ */
+ counter_u64_add(bbr_state_resend[BBR_STATE_PROBE_BW], len);
+ counter_u64_add(bbr_state_resend[(bbr_state_val(bbr) + 5)], len);
+ }
+ /* Place in both 16's the totals of retransmitted */
+ counter_u64_add(bbr_state_lost[16], len);
+ counter_u64_add(bbr_state_resend[16], len);
+ /* Place in 17's the total sent */
+ counter_u64_add(bbr_state_resend[17], len);
+ counter_u64_add(bbr_state_lost[17], len);
+
+ } else {
+ /* New sends */
+ TCPSTAT_INC(tcps_sndpack);
+ TCPSTAT_ADD(tcps_sndbyte, len);
+ /* Place in 17's the total sent */
+ counter_u64_add(bbr_state_resend[17], len);
+ counter_u64_add(bbr_state_lost[17], len);
+#ifdef NETFLIX_STATS
+ stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB,
+ len);
+#endif
+ }
+}
+
+static void
+bbr_cwnd_limiting(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t in_level)
+{
+ if (bbr->rc_filled_pipe && bbr_target_cwnd_mult_limit && (bbr->rc_use_google == 0)) {
+ /*
+ * Limit the cwnd to not be above N x the target plus whats
+ * is outstanding. The target is based on the current b/w
+ * estimate.
+ */
+ uint32_t target;
+
+ target = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), BBR_UNIT);
+ target += ctf_outstanding(tp);
+ target *= bbr_target_cwnd_mult_limit;
+ if (tp->snd_cwnd > target)
+ tp->snd_cwnd = target;
+ bbr_log_type_cwndupd(bbr, 0, 0, 0, 10, 0, 0, __LINE__);
+ }
+}
+
+static int
+bbr_window_update_needed(struct tcpcb *tp, struct socket *so, uint32_t recwin, int32_t maxseg)
+{
+ /*
+ * "adv" is the amount we could increase the window, taking into
+ * account that we are limited by TCP_MAXWIN << tp->rcv_scale.
+ */
+ uint32_t adv;
+ int32_t oldwin;
+
+ adv = min(recwin, TCP_MAXWIN << tp->rcv_scale);
+ if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) {
+ oldwin = (tp->rcv_adv - tp->rcv_nxt);
+ adv -= oldwin;
+ } else
+ oldwin = 0;
+
+ /*
+ * If the new window size ends up being the same as the old size
+ * when it is scaled, then don't force a window update.
+ */
+ if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale)
+ return (0);
+
+ if (adv >= (2 * maxseg) &&
+ (adv >= (so->so_rcv.sb_hiwat / 4) ||
+ recwin <= (so->so_rcv.sb_hiwat / 8) ||
+ so->so_rcv.sb_hiwat <= 8 * maxseg)) {
+ return (1);
+ }
+ if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat)
+ return (1);
+ return (0);
+}
+
+/*
+ * Return 0 on success and a errno on failure to send.
+ * Note that a 0 return may not mean we sent anything
+ * if the TCB was on the hpts. A non-zero return
+ * does indicate the error we got from ip[6]_output.
+ */
+static int
+bbr_output_wtime(struct tcpcb *tp, const struct timeval *tv)
+{
+ struct socket *so;
+ int32_t len;
+ uint32_t cts;
+ uint32_t recwin, sendwin;
+ int32_t sb_offset;
+ int32_t flags, abandon, error = 0;
+ struct tcp_log_buffer *lgb = NULL;
+ struct mbuf *m;
+ struct mbuf *mb;
+ uint32_t if_hw_tsomaxsegcount = 0;
+ uint32_t if_hw_tsomaxsegsize = 0;
+ uint32_t if_hw_tsomax = 0;
+ struct ip *ip = NULL;
+#ifdef TCPDEBUG
+ struct ipovly *ipov = NULL;
+#endif
+ struct tcp_bbr *bbr;
+ struct tcphdr *th;
+#ifdef NETFLIX_TCPOUDP
+ struct udphdr *udp = NULL;
+#endif
+ u_char opt[TCP_MAXOLEN];
+ unsigned ipoptlen, optlen, hdrlen;
+#ifdef NETFLIX_TCPOUDP
+ unsigned ulen;
+#endif
+ uint32_t bbr_seq;
+ uint32_t delay_calc=0;
+ uint8_t doing_tlp = 0;
+ uint8_t local_options;
+#ifdef BBR_INVARIANTS
+ uint8_t doing_retran_from = 0;
+ uint8_t picked_up_retran = 0;
+#endif
+ uint8_t wanted_cookie = 0;
+ uint8_t more_to_rxt=0;
+ int32_t prefetch_so_done = 0;
+ int32_t prefetch_rsm = 0;
+ uint32_t what_we_can = 0;
+ uint32_t tot_len = 0;
+ uint32_t rtr_cnt = 0;
+ uint32_t maxseg, pace_max_segs, p_maxseg;
+ int32_t csum_flags;
+ int32_t hw_tls;
+#if defined(IPSEC) || defined(IPSEC_SUPPORT)
+ unsigned ipsec_optlen = 0;
+
+#endif
+ volatile int32_t sack_rxmit;
+ struct bbr_sendmap *rsm = NULL;
+ int32_t tso, mtu;
+ int force_tso = 0;
+ struct tcpopt to;
+ int32_t slot = 0;
+ struct inpcb *inp;
+ struct sockbuf *sb;
+ uint32_t hpts_calling;
+#ifdef INET6
+ struct ip6_hdr *ip6 = NULL;
+ int32_t isipv6;
+#endif
+ uint8_t app_limited = BBR_JR_SENT_DATA;
+ uint8_t filled_all = 0;
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ /* We take a cache hit here */
+ memcpy(&bbr->rc_tv, tv, sizeof(struct timeval));
+ cts = tcp_tv_to_usectick(&bbr->rc_tv);
+ inp = bbr->rc_inp;
+ so = inp->inp_socket;
+ sb = &so->so_snd;
+#ifdef KERN_TLS
+ if (sb->sb_flags & SB_TLS_IFNET)
+ hw_tls = 1;
+ else
+#endif
+ hw_tls = 0;
+ kern_prefetch(sb, &maxseg);
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ if (bbr_minseg(bbr) < maxseg) {
+ tcp_bbr_tso_size_check(bbr, cts);
+ }
+ /* Remove any flags that indicate we are pacing on the inp */
+ pace_max_segs = bbr->r_ctl.rc_pace_max_segs;
+ p_maxseg = min(maxseg, pace_max_segs);
+ INP_WLOCK_ASSERT(inp);
+#ifdef TCP_OFFLOAD
+ if (tp->t_flags & TF_TOE)
+ return (tcp_offload_output(tp));
+#endif
+
+#ifdef INET6
+ if (bbr->r_state) {
+ /* Use the cache line loaded if possible */
+ isipv6 = bbr->r_is_v6;
+ } else {
+ isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
+ }
+#endif
+ if (((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) &&
+ inp->inp_in_hpts) {
+ /*
+ * We are on the hpts for some timer but not hptsi output.
+ * Possibly remove from the hpts so we can send/recv etc.
+ */
+ if ((tp->t_flags & TF_ACKNOW) == 0) {
+ /*
+ * No immediate demand right now to send an ack, but
+ * the user may have read, making room for new data
+ * (a window update). If so we may want to cancel
+ * whatever timer is running (KEEP/DEL-ACK?) and
+ * continue to send out a window update. Or we may
+ * have gotten more data into the socket buffer to
+ * send.
+ */
+ recwin = min(max(sbspace(&so->so_rcv), 0),
+ TCP_MAXWIN << tp->rcv_scale);
+ if ((bbr_window_update_needed(tp, so, recwin, maxseg) == 0) &&
+ ((sbavail(sb) + ((tcp_outflags[tp->t_state] & TH_FIN) ? 1 : 0)) <=
+ (tp->snd_max - tp->snd_una))) {
+ /*
+ * Nothing new to send and no window update
+ * is needed to send. Lets just return and
+ * let the timer-run off.
+ */
+ return (0);
+ }
+ }
+ tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT);
+ bbr_timer_cancel(bbr, __LINE__, cts);
+ }
+ if (bbr->r_ctl.rc_last_delay_val) {
+ /* Calculate a rough delay for early escape to sending */
+ if (SEQ_GT(cts, bbr->rc_pacer_started))
+ delay_calc = cts - bbr->rc_pacer_started;
+ if (delay_calc >= bbr->r_ctl.rc_last_delay_val)
+ delay_calc -= bbr->r_ctl.rc_last_delay_val;
+ else
+ delay_calc = 0;
+ }
+ /* Mark that we have called bbr_output(). */
+ if ((bbr->r_timer_override) ||
+ (tp->t_flags & TF_FORCEDATA) ||
+ (tp->t_state < TCPS_ESTABLISHED)) {
+ /* Timeouts or early states are exempt */
+ if (inp->inp_in_hpts)
+ tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT);
+ } else if (inp->inp_in_hpts) {
+ if ((bbr->r_ctl.rc_last_delay_val) &&
+ (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
+ delay_calc) {
+ /*
+ * We were being paced for output and the delay has
+ * already exceeded when we were supposed to be
+ * called, lets go ahead and pull out of the hpts
+ * and call output.
+ */
+ counter_u64_add(bbr_out_size[TCP_MSS_ACCT_LATE], 1);
+ bbr->r_ctl.rc_last_delay_val = 0;
+ tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT);
+ } else if (tp->t_state == TCPS_CLOSED) {
+ bbr->r_ctl.rc_last_delay_val = 0;
+ tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT);
+ } else {
+ /*
+ * On the hpts, you shall not pass! even if ACKNOW
+ * is on, we will when the hpts fires, unless of
+ * course we are overdue.
+ */
+ counter_u64_add(bbr_out_size[TCP_MSS_ACCT_INPACE], 1);
+ return (0);
+ }
+ }
+ bbr->rc_cwnd_limited = 0;
+ if (bbr->r_ctl.rc_last_delay_val) {
+ /* recalculate the real delay and deal with over/under */
+ if (SEQ_GT(cts, bbr->rc_pacer_started))
+ delay_calc = cts - bbr->rc_pacer_started;
+ else
+ delay_calc = 0;
+ if (delay_calc >= bbr->r_ctl.rc_last_delay_val)
+ /* Setup the delay which will be added in */
+ delay_calc -= bbr->r_ctl.rc_last_delay_val;
+ else {
+ /*
+ * We are early setup to adjust
+ * our slot time.
+ */
+ bbr->r_ctl.rc_agg_early += (bbr->r_ctl.rc_last_delay_val - delay_calc);
+ bbr->r_ctl.rc_last_delay_val = 0;
+ bbr->r_agg_early_set = 1;
+ if (bbr->r_ctl.rc_hptsi_agg_delay) {
+ if (bbr->r_ctl.rc_hptsi_agg_delay >= bbr->r_ctl.rc_agg_early) {
+ /* Nope our previous late cancels out the early */
+ bbr->r_ctl.rc_hptsi_agg_delay -= bbr->r_ctl.rc_agg_early;
+ bbr->r_agg_early_set = 0;
+ bbr->r_ctl.rc_agg_early = 0;
+ } else {
+ bbr->r_ctl.rc_agg_early -= bbr->r_ctl.rc_hptsi_agg_delay;
+ bbr->r_ctl.rc_hptsi_agg_delay = 0;
+ }
+ }
+ bbr_log_pacing_delay_calc(bbr, inp->inp_hpts_calls,
+ bbr->r_ctl.rc_agg_early, cts, 3, 0,
+ bbr->r_agg_early_set, 3);
+ BBR_STAT_INC(bbr_early);
+ delay_calc = 0;
+ }
+ } else {
+ /* We were not delayed due to hptsi */
+ if (bbr->r_agg_early_set)
+ bbr->r_ctl.rc_agg_early = 0;
+ bbr->r_agg_early_set = 0;
+ delay_calc = 0;
+ }
+ if (delay_calc) {
+ /*
+ * We had a hptsi delay which means we are falling behind on
+ * sending at the expected rate. Calculate an extra amount
+ * of data we can send, if any, to put us back on track.
+ */
+ if ((bbr->r_ctl.rc_hptsi_agg_delay + delay_calc) < bbr->r_ctl.rc_hptsi_agg_delay)
+ bbr->r_ctl.rc_hptsi_agg_delay = 0xffffffff;
+ else
+ bbr->r_ctl.rc_hptsi_agg_delay += delay_calc;
+ }
+ sendwin = min(tp->snd_wnd, tp->snd_cwnd);
+ if ((tp->snd_una == tp->snd_max) &&
+ (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) &&
+ (sbavail(sb))) {
+ /*
+ * Ok we have been idle with nothing outstanding
+ * we possibly need to start fresh with either a new
+ * suite of states or a fast-ramp up.
+ */
+ bbr_restart_after_idle(bbr,
+ cts, bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time));
+ }
+ /*
+ * Now was there a hptsi delay where we are behind? We only count
+ * being behind if: a) We are not in recovery. b) There was a delay.
+ * <and> c) We had room to send something.
+ *
+ */
+ hpts_calling = inp->inp_hpts_calls;
+ inp->inp_hpts_calls = 0;
+ if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
+ if (bbr_process_timers(tp, bbr, cts, hpts_calling)) {
+ counter_u64_add(bbr_out_size[TCP_MSS_ACCT_ATIMER], 1);
+ return (0);
+ }
+ }
+ bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
+ if (hpts_calling &&
+ (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
+ bbr->r_ctl.rc_last_delay_val = 0;
+ }
+ bbr->r_timer_override = 0;
+ bbr->r_wanted_output = 0;
+ /*
+ * For TFO connections in SYN_RECEIVED, only allow the initial
+ * SYN|ACK and those sent by the retransmit timer.
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ ((tp->t_state == TCPS_SYN_RECEIVED) ||
+ (tp->t_state == TCPS_SYN_SENT)) &&
+ SEQ_GT(tp->snd_max, tp->snd_una) && /* inital SYN or SYN|ACK sent */
+ (tp->t_rxtshift == 0)) { /* not a retransmit */
+ return (0);
+ }
+ /*
+ * Before sending anything check for a state update. For hpts
+ * calling without input this is important. If its input calling
+ * then this was already done.
+ */
+ if (bbr->rc_use_google == 0)
+ bbr_check_bbr_for_state(bbr, cts, __LINE__, 0);
+again:
+ /*
+ * If we've recently taken a timeout, snd_max will be greater than
+ * snd_max. BBR in general does not pay much attention to snd_nxt
+ * for historic reasons the persist timer still uses it. This means
+ * we have to look at it. All retransmissions that are not persits
+ * use the rsm that needs to be sent so snd_nxt is ignored. At the
+ * end of this routine we pull snd_nxt always up to snd_max.
+ */
+ doing_tlp = 0;
+#ifdef BBR_INVARIANTS
+ doing_retran_from = picked_up_retran = 0;
+#endif
+ error = 0;
+ tso = 0;
+ slot = 0;
+ mtu = 0;
+ sendwin = min(tp->snd_wnd, tp->snd_cwnd);
+ sb_offset = tp->snd_max - tp->snd_una;
+ flags = tcp_outflags[tp->t_state];
+ sack_rxmit = 0;
+ len = 0;
+ rsm = NULL;
+ if (flags & TH_RST) {
+ SOCKBUF_LOCK(sb);
+ goto send;
+ }
+recheck_resend:
+ while (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) {
+ /* We need to always have one in reserve */
+ rsm = bbr_alloc(bbr);
+ if (rsm == NULL) {
+ error = ENOMEM;
+ /* Lie to get on the hpts */
+ tot_len = tp->t_maxseg;
+ if (hpts_calling)
+ /* Retry in a ms */
+ slot = 1001;
+ goto just_return_nolock;
+ }
+ TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next);
+ bbr->r_ctl.rc_free_cnt++;
+ rsm = NULL;
+ }
+ /* What do we send, a resend? */
+ if (bbr->r_ctl.rc_resend == NULL) {
+ /* Check for rack timeout */
+ bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts);
+ if (bbr->r_ctl.rc_resend) {
+#ifdef BBR_INVARIANTS
+ picked_up_retran = 1;
+#endif
+ bbr_cong_signal(tp, NULL, CC_NDUPACK, bbr->r_ctl.rc_resend);
+ }
+ }
+ if (bbr->r_ctl.rc_resend) {
+ rsm = bbr->r_ctl.rc_resend;
+#ifdef BBR_INVARIANTS
+ doing_retran_from = 1;
+#endif
+ /* Remove any TLP flags its a RACK or T-O */
+ rsm->r_flags &= ~BBR_TLP;
+ bbr->r_ctl.rc_resend = NULL;
+ if (SEQ_LT(rsm->r_start, tp->snd_una)) {
+#ifdef BBR_INVARIANTS
+ panic("Huh, tp:%p bbr:%p rsm:%p start:%u < snd_una:%u\n",
+ tp, bbr, rsm, rsm->r_start, tp->snd_una);
+ goto recheck_resend;
+#else
+ /* TSNH */
+ rsm = NULL;
+ goto recheck_resend;
+#endif
+ }
+ rtr_cnt++;
+ if (rsm->r_flags & BBR_HAS_SYN) {
+ /* Only retransmit a SYN by itself */
+ len = 0;
+ if ((flags & TH_SYN) == 0) {
+ /* Huh something is wrong */
+ rsm->r_start++;
+ if (rsm->r_start == rsm->r_end) {
+ /* Clean it up, somehow we missed the ack? */
+ bbr_log_syn(tp, NULL);
+ } else {
+ /* TFO with data? */
+ rsm->r_flags &= ~BBR_HAS_SYN;
+ len = rsm->r_end - rsm->r_start;
+ }
+ } else {
+ /* Retransmitting SYN */
+ rsm = NULL;
+ SOCKBUF_LOCK(sb);
+ goto send;
+ }
+ } else
+ len = rsm->r_end - rsm->r_start;
+ if ((bbr->rc_resends_use_tso == 0) &&
+#ifdef KERN_TLS
+ ((sb->sb_flags & SB_TLS_IFNET) == 0) &&
+#endif
+ (len > maxseg)) {
+ len = maxseg;
+ more_to_rxt = 1;
+ }
+ sb_offset = rsm->r_start - tp->snd_una;
+ if (len > 0) {
+ sack_rxmit = 1;
+ TCPSTAT_INC(tcps_sack_rexmits);
+ TCPSTAT_ADD(tcps_sack_rexmit_bytes,
+ min(len, maxseg));
+ } else {
+ /* I dont think this can happen */
+ rsm = NULL;
+ goto recheck_resend;
+ }
+ BBR_STAT_INC(bbr_resends_set);
+ } else if (bbr->r_ctl.rc_tlp_send) {
+ /*
+ * Tail loss probe
+ */
+ doing_tlp = 1;
+ rsm = bbr->r_ctl.rc_tlp_send;
+ bbr->r_ctl.rc_tlp_send = NULL;
+ sack_rxmit = 1;
+ len = rsm->r_end - rsm->r_start;
+ rtr_cnt++;
+ if ((bbr->rc_resends_use_tso == 0) && (len > maxseg))
+ len = maxseg;
+
+ if (SEQ_GT(tp->snd_una, rsm->r_start)) {
+#ifdef BBR_INVARIANTS
+ panic("tp:%p bbc:%p snd_una:%u rsm:%p r_start:%u",
+ tp, bbr, tp->snd_una, rsm, rsm->r_start);
+#else
+ /* TSNH */
+ rsm = NULL;
+ goto recheck_resend;
+#endif
+ }
+ sb_offset = rsm->r_start - tp->snd_una;
+ BBR_STAT_INC(bbr_tlp_set);
+ }
+ /*
+ * Enforce a connection sendmap count limit if set
+ * as long as we are not retransmiting.
+ */
+ if ((rsm == NULL) &&
+ (bbr_tcp_map_entries_limit > 0) &&
+ (bbr->r_ctl.rc_num_maps_alloced >= bbr_tcp_map_entries_limit)) {
+ BBR_STAT_INC(bbr_alloc_limited);
+ if (!bbr->alloc_limit_reported) {
+ bbr->alloc_limit_reported = 1;
+ BBR_STAT_INC(bbr_alloc_limited_conns);
+ }
+ goto just_return_nolock;
+ }
+#ifdef BBR_INVARIANTS
+ if (rsm && SEQ_LT(rsm->r_start, tp->snd_una)) {
+ panic("tp:%p bbr:%p rsm:%p sb_offset:%u len:%u",
+ tp, bbr, rsm, sb_offset, len);
+ }
+#endif
+ /*
+ * Get standard flags, and add SYN or FIN if requested by 'hidden'
+ * state flags.
+ */
+ if (tp->t_flags & TF_NEEDFIN && (rsm == NULL))
+ flags |= TH_FIN;
+ if (tp->t_flags & TF_NEEDSYN)
+ flags |= TH_SYN;
+
+ if (rsm && (rsm->r_flags & BBR_HAS_FIN)) {
+ /* we are retransmitting the fin */
+ len--;
+ if (len) {
+ /*
+ * When retransmitting data do *not* include the
+ * FIN. This could happen from a TLP probe if we
+ * allowed data with a FIN.
+ */
+ flags &= ~TH_FIN;
+ }
+ } else if (rsm) {
+ if (flags & TH_FIN)
+ flags &= ~TH_FIN;
+ }
+ if ((sack_rxmit == 0) && (prefetch_rsm == 0)) {
+ void *end_rsm;
+
+ end_rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext);
+ if (end_rsm)
+ kern_prefetch(end_rsm, &prefetch_rsm);
+ prefetch_rsm = 1;
+ }
+ SOCKBUF_LOCK(sb);
+ /*
+ * If in persist timeout with window of 0, send 1 byte. Otherwise,
+ * if window is small but nonzero and time TF_SENTFIN expired, we
+ * will send what we can and go to transmit state.
+ */
+ if (tp->t_flags & TF_FORCEDATA) {
+ if ((sendwin == 0) || (sendwin <= (tp->snd_max - tp->snd_una))) {
+ /*
+ * If we still have some data to send, then clear
+ * the FIN bit. Usually this would happen below
+ * when it realizes that we aren't sending all the
+ * data. However, if we have exactly 1 byte of
+ * unsent data, then it won't clear the FIN bit
+ * below, and if we are in persist state, we wind up
+ * sending the packet without recording that we sent
+ * the FIN bit.
+ *
+ * We can't just blindly clear the FIN bit, because
+ * if we don't have any more data to send then the
+ * probe will be the FIN itself.
+ */
+ if (sb_offset < sbused(sb))
+ flags &= ~TH_FIN;
+ sendwin = 1;
+ } else {
+ if ((bbr->rc_in_persist != 0) &&
+ (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2),
+ bbr_minseg(bbr)))) {
+ /* Exit persists if there is space */
+ bbr_exit_persist(tp, bbr, cts, __LINE__);
+ }
+ if (rsm == NULL) {
+ /*
+ * If we are dropping persist mode then we
+ * need to correct sb_offset if not a
+ * retransmit.
+ */
+ sb_offset = tp->snd_max - tp->snd_una;
+ }
+ }
+ }
+ /*
+ * If snd_nxt == snd_max and we have transmitted a FIN, the
+ * sb_offset will be > 0 even if so_snd.sb_cc is 0, resulting in a
+ * negative length. This can also occur when TCP opens up its
+ * congestion window while receiving additional duplicate acks after
+ * fast-retransmit because TCP will reset snd_nxt to snd_max after
+ * the fast-retransmit.
+ *
+ * In the normal retransmit-FIN-only case, however, snd_nxt will be
+ * set to snd_una, the sb_offset will be 0, and the length may wind
+ * up 0.
+ *
+ * If sack_rxmit is true we are retransmitting from the scoreboard
+ * in which case len is already set.
+ */
+ if (sack_rxmit == 0) {
+ uint32_t avail;
+
+ avail = sbavail(sb);
+ if (SEQ_GT(tp->snd_max, tp->snd_una))
+ sb_offset = tp->snd_max - tp->snd_una;
+ else
+ sb_offset = 0;
+ if (bbr->rc_tlp_new_data) {
+ /* TLP is forcing out new data */
+ uint32_t tlplen;
+
+ doing_tlp = 1;
+ tlplen = maxseg;
+
+ if (tlplen > (uint32_t)(avail - sb_offset)) {
+ tlplen = (uint32_t)(avail - sb_offset);
+ }
+ if (tlplen > tp->snd_wnd) {
+ len = tp->snd_wnd;
+ } else {
+ len = tlplen;
+ }
+ bbr->rc_tlp_new_data = 0;
+ } else {
+ what_we_can = len = bbr_what_can_we_send(tp, bbr, sendwin, avail, sb_offset, cts);
+ if ((len < p_maxseg) &&
+ (bbr->rc_in_persist == 0) &&
+ (ctf_outstanding(tp) >= (2 * p_maxseg)) &&
+ ((avail - sb_offset) >= p_maxseg)) {
+ /*
+ * We are not completing whats in the socket
+ * buffer (i.e. there is at least a segment
+ * waiting to send) and we have 2 or more
+ * segments outstanding. There is no sense
+ * of sending a little piece. Lets defer and
+ * and wait until we can send a whole
+ * segment.
+ */
+ len = 0;
+ }
+ if ((tp->t_flags & TF_FORCEDATA) && (bbr->rc_in_persist)) {
+ /*
+ * We are in persists, figure out if
+ * a retransmit is available (maybe the previous
+ * persists we sent) or if we have to send new
+ * data.
+ */
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ if (rsm) {
+ len = rsm->r_end - rsm->r_start;
+ if (rsm->r_flags & BBR_HAS_FIN)
+ len--;
+ if ((bbr->rc_resends_use_tso == 0) && (len > maxseg))
+ len = maxseg;
+ if (len > 1)
+ BBR_STAT_INC(bbr_persist_reneg);
+ /*
+ * XXXrrs we could force the len to
+ * 1 byte here to cause the chunk to
+ * split apart.. but that would then
+ * mean we always retransmit it as
+ * one byte even after the window
+ * opens.
+ */
+ sack_rxmit = 1;
+ sb_offset = rsm->r_start - tp->snd_una;
+ } else {
+ /*
+ * First time through in persists or peer
+ * acked our one byte. Though we do have
+ * to have something in the sb.
+ */
+ len = 1;
+ sb_offset = 0;
+ if (avail == 0)
+ len = 0;
+ }
+ }
+ }
+ }
+ if (prefetch_so_done == 0) {
+ kern_prefetch(so, &prefetch_so_done);
+ prefetch_so_done = 1;
+ }
+ /*
+ * Lop off SYN bit if it has already been sent. However, if this is
+ * SYN-SENT state and if segment contains data and if we don't know
+ * that foreign host supports TAO, suppress sending segment.
+ */
+ if ((flags & TH_SYN) && (rsm == NULL) &&
+ SEQ_GT(tp->snd_max, tp->snd_una)) {
+ if (tp->t_state != TCPS_SYN_RECEIVED)
+ flags &= ~TH_SYN;
+ /*
+ * When sending additional segments following a TFO SYN|ACK,
+ * do not include the SYN bit.
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ (tp->t_state == TCPS_SYN_RECEIVED))
+ flags &= ~TH_SYN;
+ sb_offset--, len++;
+ if (sbavail(sb) == 0)
+ len = 0;
+ } else if ((flags & TH_SYN) && rsm) {
+ /*
+ * Subtract one from the len for the SYN being
+ * retransmitted.
+ */
+ len--;
+ }
+ /*
+ * Be careful not to send data and/or FIN on SYN segments. This
+ * measure is needed to prevent interoperability problems with not
+ * fully conformant TCP implementations.
+ */
+ if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) {
+ len = 0;
+ flags &= ~TH_FIN;
+ }
+ /*
+ * On TFO sockets, ensure no data is sent in the following cases:
+ *
+ * - When retransmitting SYN|ACK on a passively-created socket
+ * - When retransmitting SYN on an actively created socket
+ * - When sending a zero-length cookie (cookie request) on an
+ * actively created socket
+ * - When the socket is in the CLOSED state (RST is being sent)
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ (((flags & TH_SYN) && (tp->t_rxtshift > 0)) ||
+ ((tp->t_state == TCPS_SYN_SENT) &&
+ (tp->t_tfo_client_cookie_len == 0)) ||
+ (flags & TH_RST))) {
+ len = 0;
+ sack_rxmit = 0;
+ rsm = NULL;
+ }
+ /* Without fast-open there should never be data sent on a SYN */
+ if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags)))
+ len = 0;
+ if (len <= 0) {
+ /*
+ * If FIN has been sent but not acked, but we haven't been
+ * called to retransmit, len will be < 0. Otherwise, window
+ * shrank after we sent into it. If window shrank to 0,
+ * cancel pending retransmit, pull snd_nxt back to (closed)
+ * window, and set the persist timer if it isn't already
+ * going. If the window didn't close completely, just wait
+ * for an ACK.
+ *
+ * We also do a general check here to ensure that we will
+ * set the persist timer when we have data to send, but a
+ * 0-byte window. This makes sure the persist timer is set
+ * even if the packet hits one of the "goto send" lines
+ * below.
+ */
+ len = 0;
+ if ((tp->snd_wnd == 0) &&
+ (TCPS_HAVEESTABLISHED(tp->t_state)) &&
+ (tp->snd_una == tp->snd_max) &&
+ (sb_offset < (int)sbavail(sb))) {
+ /*
+ * Not enough room in the rwnd to send
+ * a paced segment out.
+ */
+ bbr_enter_persist(tp, bbr, cts, __LINE__);
+ }
+ } else if ((rsm == NULL) &&
+ (doing_tlp == 0) &&
+ (len < bbr->r_ctl.rc_pace_max_segs)) {
+ /*
+ * We are not sending a full segment for
+ * some reason. Should we not send anything (think
+ * sws or persists)?
+ */
+ if ((tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) &&
+ (TCPS_HAVEESTABLISHED(tp->t_state)) &&
+ (len < (int)(sbavail(sb) - sb_offset))) {
+ /*
+ * Here the rwnd is less than
+ * the pacing size, this is not a retransmit,
+ * we are established and
+ * the send is not the last in the socket buffer
+ * lets not send, and possibly enter persists.
+ */
+ len = 0;
+ if (tp->snd_max == tp->snd_una)
+ bbr_enter_persist(tp, bbr, cts, __LINE__);
+ } else if ((tp->snd_cwnd >= bbr->r_ctl.rc_pace_max_segs) &&
+ (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) &&
+ (len < (int)(sbavail(sb) - sb_offset)) &&
+ (len < bbr_minseg(bbr))) {
+ /*
+ * Here we are not retransmitting, and
+ * the cwnd is not so small that we could
+ * not send at least a min size (rxt timer
+ * not having gone off), We have 2 segments or
+ * more already in flight, its not the tail end
+ * of the socket buffer and the cwnd is blocking
+ * us from sending out minimum pacing segment size.
+ * Lets not send anything.
+ */
+ bbr->rc_cwnd_limited = 1;
+ len = 0;
+ } else if (((tp->snd_wnd - ctf_outstanding(tp)) <
+ min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) &&
+ (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) &&
+ (len < (int)(sbavail(sb) - sb_offset)) &&
+ (TCPS_HAVEESTABLISHED(tp->t_state))) {
+ /*
+ * Here we have a send window but we have
+ * filled it up and we can't send another pacing segment.
+ * We also have in flight more than 2 segments
+ * and we are not completing the sb i.e. we allow
+ * the last bytes of the sb to go out even if
+ * its not a full pacing segment.
+ */
+ len = 0;
+ }
+ }
+ /* len will be >= 0 after this point. */
+ KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
+ tcp_sndbuf_autoscale(tp, so, sendwin);
+ /*
+ *
+ */
+ if (bbr->rc_in_persist &&
+ len &&
+ (rsm == NULL) &&
+ (len < min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs))) {
+ /*
+ * We are in persist, not doing a retransmit and don't have enough space
+ * yet to send a full TSO. So is it at the end of the sb
+ * if so we need to send else nuke to 0 and don't send.
+ */
+ int sbleft;
+ if (sbavail(sb) > sb_offset)
+ sbleft = sbavail(sb) - sb_offset;
+ else
+ sbleft = 0;
+ if (sbleft >= min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs)) {
+ /* not at end of sb lets not send */
+ len = 0;
+ }
+ }
+ /*
+ * Decide if we can use TCP Segmentation Offloading (if supported by
+ * hardware).
+ *
+ * TSO may only be used if we are in a pure bulk sending state. The
+ * presence of TCP-MD5, SACK retransmits, SACK advertizements and IP
+ * options prevent using TSO. With TSO the TCP header is the same
+ * (except for the sequence number) for all generated packets. This
+ * makes it impossible to transmit any options which vary per
+ * generated segment or packet.
+ *
+ * IPv4 handling has a clear separation of ip options and ip header
+ * flags while IPv6 combines both in in6p_outputopts. ip6_optlen()
+ * does the right thing below to provide length of just ip options
+ * and thus checking for ipoptlen is enough to decide if ip options
+ * are present.
+ */
+#ifdef INET6
+ if (isipv6)
+ ipoptlen = ip6_optlen(inp);
+ else
+#endif
+ if (inp->inp_options)
+ ipoptlen = inp->inp_options->m_len -
+ offsetof(struct ipoption, ipopt_list);
+ else
+ ipoptlen = 0;
+#if defined(IPSEC) || defined(IPSEC_SUPPORT)
+ /*
+ * Pre-calculate here as we save another lookup into the darknesses
+ * of IPsec that way and can actually decide if TSO is ok.
+ */
+#ifdef INET6
+ if (isipv6 && IPSEC_ENABLED(ipv6))
+ ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp);
+#ifdef INET
+ else
+#endif
+#endif /* INET6 */
+#ifdef INET
+ if (IPSEC_ENABLED(ipv4))
+ ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp);
+#endif /* INET */
+#endif /* IPSEC */
+#if defined(IPSEC) || defined(IPSEC_SUPPORT)
+ ipoptlen += ipsec_optlen;
+#endif
+ if ((tp->t_flags & TF_TSO) && V_tcp_do_tso &&
+ (len > maxseg) &&
+ (tp->t_port == 0) &&
+ ((tp->t_flags & TF_SIGNATURE) == 0) &&
+ tp->rcv_numsacks == 0 &&
+ ipoptlen == 0)
+ tso = 1;
+
+ recwin = min(max(sbspace(&so->so_rcv), 0),
+ TCP_MAXWIN << tp->rcv_scale);
+ /*
+ * Sender silly window avoidance. We transmit under the following
+ * conditions when len is non-zero:
+ *
+ * - We have a full segment (or more with TSO) - This is the last
+ * buffer in a write()/send() and we are either idle or running
+ * NODELAY - we've timed out (e.g. persist timer) - we have more
+ * then 1/2 the maximum send window's worth of data (receiver may be
+ * limited the window size) - we need to retransmit
+ */
+ if (rsm)
+ goto send;
+ if (len) {
+ if (sack_rxmit)
+ goto send;
+ if (len >= p_maxseg)
+ goto send;
+ /*
+ * NOTE! on localhost connections an 'ack' from the remote
+ * end may occur synchronously with the output and cause us
+ * to flush a buffer queued with moretocome. XXX
+ *
+ */
+ if (((tp->t_flags & TF_MORETOCOME) == 0) && /* normal case */
+ ((tp->t_flags & TF_NODELAY) ||
+ ((uint32_t)len + (uint32_t)sb_offset) >= sbavail(&so->so_snd)) &&
+ (tp->t_flags & TF_NOPUSH) == 0) {
+ goto send;
+ }
+ if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */
+ goto send;
+ }
+ if (tp->t_flags & TF_FORCEDATA) { /* typ. timeout case */
+ goto send;
+ }
+ if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
+ goto send;
+ }
+ }
+ /*
+ * Sending of standalone window updates.
+ *
+ * Window updates are important when we close our window due to a
+ * full socket buffer and are opening it again after the application
+ * reads data from it. Once the window has opened again and the
+ * remote end starts to send again the ACK clock takes over and
+ * provides the most current window information.
+ *
+ * We must avoid the silly window syndrome whereas every read from
+ * the receive buffer, no matter how small, causes a window update
+ * to be sent. We also should avoid sending a flurry of window
+ * updates when the socket buffer had queued a lot of data and the
+ * application is doing small reads.
+ *
+ * Prevent a flurry of pointless window updates by only sending an
+ * update when we can increase the advertized window by more than
+ * 1/4th of the socket buffer capacity. When the buffer is getting
+ * full or is very small be more aggressive and send an update
+ * whenever we can increase by two mss sized segments. In all other
+ * situations the ACK's to new incoming data will carry further
+ * window increases.
+ *
+ * Don't send an independent window update if a delayed ACK is
+ * pending (it will get piggy-backed on it) or the remote side
+ * already has done a half-close and won't send more data. Skip
+ * this if the connection is in T/TCP half-open state.
+ */
+ if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) &&
+ !(tp->t_flags & TF_DELACK) &&
+ !TCPS_HAVERCVDFIN(tp->t_state)) {
+ /* Check to see if we should do a window update */
+ if (bbr_window_update_needed(tp, so, recwin, maxseg))
+ goto send;
+ }
+ /*
+ * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW
+ * is also a catch-all for the retransmit timer timeout case.
+ */
+ if (tp->t_flags & TF_ACKNOW) {
+ goto send;
+ }
+ if (((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0)) {
+ goto send;
+ }
+ if (SEQ_GT(tp->snd_up, tp->snd_una)) {
+ goto send;
+ }
+ /*
+ * If our state indicates that FIN should be sent and we have not
+ * yet done so, then we need to send.
+ */
+ if (flags & TH_FIN &&
+ ((tp->t_flags & TF_SENTFIN) == 0)) {
+ goto send;
+ }
+ /*
+ * No reason to send a segment, just return.
+ */
+just_return:
+ SOCKBUF_UNLOCK(sb);
+just_return_nolock:
+ if (tot_len)
+ slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0);
+ if (bbr->rc_no_pacing)
+ slot = 0;
+ if (tot_len == 0) {
+ if ((ctf_outstanding(tp) + min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) >=
+ tp->snd_wnd) {
+ BBR_STAT_INC(bbr_rwnd_limited);
+ app_limited = BBR_JR_RWND_LIMITED;
+ bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp));
+ if ((bbr->rc_in_persist == 0) &&
+ TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->snd_max == tp->snd_una) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd)) {
+ /* No send window.. we must enter persist */
+ bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__);
+ }
+ } else if (ctf_outstanding(tp) >= sbavail(sb)) {
+ BBR_STAT_INC(bbr_app_limited);
+ app_limited = BBR_JR_APP_LIMITED;
+ bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp));
+ } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)) + p_maxseg) >= tp->snd_cwnd) {
+ BBR_STAT_INC(bbr_cwnd_limited);
+ app_limited = BBR_JR_CWND_LIMITED;
+ bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)));
+ bbr->rc_cwnd_limited = 1;
+ } else {
+ BBR_STAT_INC(bbr_app_limited);
+ app_limited = BBR_JR_APP_LIMITED;
+ bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp));
+ }
+ bbr->r_ctl.rc_hptsi_agg_delay = 0;
+ bbr->r_agg_early_set = 0;
+ bbr->r_ctl.rc_agg_early = 0;
+ bbr->r_ctl.rc_last_delay_val = 0;
+ } else if (bbr->rc_use_google == 0)
+ bbr_check_bbr_for_state(bbr, cts, __LINE__, 0);
+ /* Are we app limited? */
+ if ((app_limited == BBR_JR_APP_LIMITED) ||
+ (app_limited == BBR_JR_RWND_LIMITED)) {
+ /**
+ * We are application limited.
+ */
+ bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_delivered);
+ }
+ if (tot_len == 0)
+ counter_u64_add(bbr_out_size[TCP_MSS_ACCT_JUSTRET], 1);
+ tp->t_flags &= ~TF_FORCEDATA;
+ /* Dont update the time if we did not send */
+ bbr->r_ctl.rc_last_delay_val = 0;
+ bbr->rc_output_starts_timer = 1;
+ bbr_start_hpts_timer(bbr, tp, cts, 9, slot, tot_len);
+ bbr_log_type_just_return(bbr, cts, tot_len, hpts_calling, app_limited, p_maxseg, len);
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ /* Make sure snd_nxt is drug up */
+ tp->snd_nxt = tp->snd_max;
+ }
+ return (error);
+
+send:
+ if (doing_tlp == 0) {
+ /*
+ * Data not a TLP, and its not the rxt firing. If it is the
+ * rxt firing, we want to leave the tlp_in_progress flag on
+ * so we don't send another TLP. It has to be a rack timer
+ * or normal send (response to acked data) to clear the tlp
+ * in progress flag.
+ */
+ bbr->rc_tlp_in_progress = 0;
+ bbr->rc_tlp_rtx_out = 0;
+ } else {
+ /*
+ * Its a TLP.
+ */
+ bbr->rc_tlp_in_progress = 1;
+ }
+ bbr_timer_cancel(bbr, __LINE__, cts);
+ if (rsm == NULL) {
+ if (sbused(sb) > 0) {
+ /*
+ * This is sub-optimal. We only send a stand alone
+ * FIN on its own segment.
+ */
+ if (flags & TH_FIN) {
+ flags &= ~TH_FIN;
+ if ((len == 0) && ((tp->t_flags & TF_ACKNOW) == 0)) {
+ /* Lets not send this */
+ slot = 0;
+ goto just_return;
+ }
+ }
+ }
+ } else {
+ /*
+ * We do *not* send a FIN on a retransmit if it has data.
+ * The if clause here where len > 1 should never come true.
+ */
+ if ((len > 0) &&
+ (((rsm->r_flags & BBR_HAS_FIN) == 0) &&
+ (flags & TH_FIN))) {
+ flags &= ~TH_FIN;
+ len--;
+ }
+ }
+ SOCKBUF_LOCK_ASSERT(sb);
+ if (len > 0) {
+ if ((tp->snd_una == tp->snd_max) &&
+ (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) {
+ /*
+ * This qualifies as a RTT_PROBE session since we
+ * drop the data outstanding to nothing and waited
+ * more than bbr_rtt_probe_time.
+ */
+ bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0);
+ bbr_set_reduced_rtt(bbr, cts, __LINE__);
+ }
+ if (len >= maxseg)
+ tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT;
+ else
+ tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT;
+ }
+ /*
+ * Before ESTABLISHED, force sending of initial options unless TCP
+ * set not to do any options. NOTE: we assume that the IP/TCP header
+ * plus TCP options always fit in a single mbuf, leaving room for a
+ * maximum link header, i.e. max_linkhdr + sizeof (struct tcpiphdr)
+ * + optlen <= MCLBYTES
+ */
+ optlen = 0;
+#ifdef INET6
+ if (isipv6)
+ hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
+ else
+#endif
+ hdrlen = sizeof(struct tcpiphdr);
+
+ /*
+ * Compute options for segment. We only have to care about SYN and
+ * established connection segments. Options for SYN-ACK segments
+ * are handled in TCP syncache.
+ */
+ to.to_flags = 0;
+ local_options = 0;
+ if ((tp->t_flags & TF_NOOPT) == 0) {
+ /* Maximum segment size. */
+ if (flags & TH_SYN) {
+ to.to_mss = tcp_mssopt(&inp->inp_inc);
+#ifdef NETFLIX_TCPOUDP
+ if (tp->t_port)
+ to.to_mss -= V_tcp_udp_tunneling_overhead;
+#endif
+ to.to_flags |= TOF_MSS;
+ /*
+ * On SYN or SYN|ACK transmits on TFO connections,
+ * only include the TFO option if it is not a
+ * retransmit, as the presence of the TFO option may
+ * have caused the original SYN or SYN|ACK to have
+ * been dropped by a middlebox.
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ (tp->t_rxtshift == 0)) {
+ if (tp->t_state == TCPS_SYN_RECEIVED) {
+ to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN;
+ to.to_tfo_cookie =
+ (u_int8_t *)&tp->t_tfo_cookie.server;
+ to.to_flags |= TOF_FASTOPEN;
+ wanted_cookie = 1;
+ } else if (tp->t_state == TCPS_SYN_SENT) {
+ to.to_tfo_len =
+ tp->t_tfo_client_cookie_len;
+ to.to_tfo_cookie =
+ tp->t_tfo_cookie.client;
+ to.to_flags |= TOF_FASTOPEN;
+ wanted_cookie = 1;
+ }
+ }
+ }
+ /* Window scaling. */
+ if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) {
+ to.to_wscale = tp->request_r_scale;
+ to.to_flags |= TOF_SCALE;
+ }
+ /* Timestamps. */
+ if ((tp->t_flags & TF_RCVD_TSTMP) ||
+ ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) {
+ to.to_tsval = tcp_tv_to_mssectick(&bbr->rc_tv) + tp->ts_offset;
+ to.to_tsecr = tp->ts_recent;
+ to.to_flags |= TOF_TS;
+ local_options += TCPOLEN_TIMESTAMP + 2;
+ }
+ /* Set receive buffer autosizing timestamp. */
+ if (tp->rfbuf_ts == 0 &&
+ (so->so_rcv.sb_flags & SB_AUTOSIZE))
+ tp->rfbuf_ts = tcp_tv_to_mssectick(&bbr->rc_tv);
+ /* Selective ACK's. */
+ if (flags & TH_SYN)
+ to.to_flags |= TOF_SACKPERM;
+ else if (TCPS_HAVEESTABLISHED(tp->t_state) &&
+ tp->rcv_numsacks > 0) {
+ to.to_flags |= TOF_SACK;
+ to.to_nsacks = tp->rcv_numsacks;
+ to.to_sacks = (u_char *)tp->sackblks;
+ }
+#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
+ /* TCP-MD5 (RFC2385). */
+ if (tp->t_flags & TF_SIGNATURE)
+ to.to_flags |= TOF_SIGNATURE;
+#endif /* TCP_SIGNATURE */
+
+ /* Processing the options. */
+ hdrlen += (optlen = tcp_addoptions(&to, opt));
+ /*
+ * If we wanted a TFO option to be added, but it was unable
+ * to fit, ensure no data is sent.
+ */
+ if (IS_FASTOPEN(tp->t_flags) && wanted_cookie &&
+ !(to.to_flags & TOF_FASTOPEN))
+ len = 0;
+ }
+#ifdef NETFLIX_TCPOUDP
+ if (tp->t_port) {
+ if (V_tcp_udp_tunneling_port == 0) {
+ /* The port was removed?? */
+ SOCKBUF_UNLOCK(&so->so_snd);
+ return (EHOSTUNREACH);
+ }
+
+ hdrlen += sizeof(struct udphdr);
+ }
+#endif
+#ifdef INET6
+ if (isipv6)
+ ipoptlen = ip6_optlen(tp->t_inpcb);
+ else
+#endif
+ if (tp->t_inpcb->inp_options)
+ ipoptlen = tp->t_inpcb->inp_options->m_len -
+ offsetof(struct ipoption, ipopt_list);
+ else
+ ipoptlen = 0;
+ ipoptlen = 0;
+#if defined(IPSEC) || defined(IPSEC_SUPPORT)
+ ipoptlen += ipsec_optlen;
+#endif
+ if (bbr->rc_last_options != local_options) {
+ /*
+ * Cache the options length this generally does not change
+ * on a connection. We use this to calculate TSO.
+ */
+ bbr->rc_last_options = local_options;
+ }
+ maxseg = tp->t_maxseg - (ipoptlen + optlen);
+ p_maxseg = min(maxseg, pace_max_segs);
+ /*
+ * Adjust data length if insertion of options will bump the packet
+ * length beyond the t_maxseg length. Clear the FIN bit because we
+ * cut off the tail of the segment.
+ */
+#ifdef KERN_TLS
+ /* force TSO for so TLS offload can get mss */
+ if (sb->sb_flags & SB_TLS_IFNET) {
+ force_tso = 1;
+ }
+#endif
+
+ if (len > maxseg) {
+ if (len != 0 && (flags & TH_FIN)) {
+ flags &= ~TH_FIN;
+ }
+ if (tso) {
+ uint32_t moff;
+ int32_t max_len;
+
+ /* extract TSO information */
+ if_hw_tsomax = tp->t_tsomax;
+ if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
+ if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
+ KASSERT(ipoptlen == 0,
+ ("%s: TSO can't do IP options", __func__));
+
+ /*
+ * Check if we should limit by maximum payload
+ * length:
+ */
+ if (if_hw_tsomax != 0) {
+ /* compute maximum TSO length */
+ max_len = (if_hw_tsomax - hdrlen -
+ max_linkhdr);
+ if (max_len <= 0) {
+ len = 0;
+ } else if (len > max_len) {
+ len = max_len;
+ }
+ }
+ /*
+ * Prevent the last segment from being fractional
+ * unless the send sockbuf can be emptied:
+ */
+ if (((sb_offset + len) < sbavail(sb)) &&
+ (hw_tls == 0)) {
+ moff = len % (uint32_t)maxseg;
+ if (moff != 0) {
+ len -= moff;
+ }
+ }
+ /*
+ * In case there are too many small fragments don't
+ * use TSO:
+ */
+ if (len <= maxseg) {
+ len = maxseg;
+ tso = 0;
+ }
+ } else {
+ /* Not doing TSO */
+ if (optlen + ipoptlen > tp->t_maxseg) {
+ /*
+ * Since we don't have enough space to put
+ * the IP header chain and the TCP header in
+ * one packet as required by RFC 7112, don't
+ * send it.
+ */
+ SOCKBUF_UNLOCK(&so->so_snd);
+ error = EMSGSIZE;
+ sack_rxmit = 0;
+ goto out;
+ }
+ len = maxseg;
+ }
+ } else {
+ /* Not doing TSO */
+ if_hw_tsomaxsegcount = 0;
+ tso = 0;
+ }
+ KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET,
+ ("%s: len > IP_MAXPACKET", __func__));
+#ifdef DIAGNOSTIC
+#ifdef INET6
+ if (max_linkhdr + hdrlen > MCLBYTES)
+#else
+ if (max_linkhdr + hdrlen > MHLEN)
+#endif
+ panic("tcphdr too big");
+#endif
+ /*
+ * This KASSERT is here to catch edge cases at a well defined place.
+ * Before, those had triggered (random) panic conditions further
+ * down.
+ */
+#ifdef BBR_INVARIANTS
+ if (sack_rxmit) {
+ if (SEQ_LT(rsm->r_start, tp->snd_una)) {
+ panic("RSM:%p TP:%p bbr:%p start:%u is < snd_una:%u",
+ rsm, tp, bbr, rsm->r_start, tp->snd_una);
+ }
+ }
+#endif
+ KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
+ if ((len == 0) &&
+ (flags & TH_FIN) &&
+ (sbused(sb))) {
+ /*
+ * We have outstanding data, don't send a fin by itself!.
+ */
+ slot = 0;
+ goto just_return;
+ }
+ /*
+ * Grab a header mbuf, attaching a copy of data to be transmitted,
+ * and initialize the header from the template for sends on this
+ * connection.
+ */
+ if (len) {
+ uint32_t moff;
+ uint32_t orig_len;
+
+ /*
+ * We place a limit on sending with hptsi.
+ */
+ if ((rsm == NULL) && len > pace_max_segs)
+ len = pace_max_segs;
+ if (len <= maxseg)
+ tso = 0;
+#ifdef INET6
+ if (MHLEN < hdrlen + max_linkhdr)
+ m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
+ else
+#endif
+ m = m_gethdr(M_NOWAIT, MT_DATA);
+
+ if (m == NULL) {
+ BBR_STAT_INC(bbr_failed_mbuf_aloc);
+ bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0);
+ SOCKBUF_UNLOCK(sb);
+ error = ENOBUFS;
+ sack_rxmit = 0;
+ goto out;
+ }
+ m->m_data += max_linkhdr;
+ m->m_len = hdrlen;
+ /*
+ * Start the m_copy functions from the closest mbuf to the
+ * sb_offset in the socket buffer chain.
+ */
+ if ((sb_offset > sbavail(sb)) || ((len + sb_offset) > sbavail(sb))) {
+#ifdef BBR_INVARIANTS
+ if ((len + sb_offset) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0)))
+ panic("tp:%p bbr:%p len:%u sb_offset:%u sbavail:%u rsm:%p %u:%u:%u",
+ tp, bbr, len, sb_offset, sbavail(sb), rsm,
+ doing_retran_from,
+ picked_up_retran,
+ doing_tlp);
+
+#endif
+ /*
+ * In this messed up situation we have two choices,
+ * a) pretend the send worked, and just start timers
+ * and what not (not good since that may lead us
+ * back here a lot). <or> b) Send the lowest segment
+ * in the map. <or> c) Drop the connection. Lets do
+ * <b> which if it continues to happen will lead to
+ * <c> via timeouts.
+ */
+ BBR_STAT_INC(bbr_offset_recovery);
+ rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map);
+ sb_offset = 0;
+ if (rsm == NULL) {
+ sack_rxmit = 0;
+ len = sbavail(sb);
+ } else {
+ sack_rxmit = 1;
+ if (rsm->r_start != tp->snd_una) {
+ /*
+ * Things are really messed up, <c>
+ * is the only thing to do.
+ */
+ BBR_STAT_INC(bbr_offset_drop);
+ tcp_set_inp_to_drop(inp, EFAULT);
+ return (0);
+ }
+ len = rsm->r_end - rsm->r_start;
+ }
+ if (len > sbavail(sb))
+ len = sbavail(sb);
+ if (len > maxseg)
+ len = maxseg;
+ }
+ mb = sbsndptr_noadv(sb, sb_offset, &moff);
+ if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) {
+ m_copydata(mb, moff, (int)len,
+ mtod(m, caddr_t)+hdrlen);
+ if (rsm == NULL)
+ sbsndptr_adv(sb, mb, len);
+ m->m_len += len;
+ } else {
+ struct sockbuf *msb;
+
+ if (rsm)
+ msb = NULL;
+ else
+ msb = sb;
+#ifdef BBR_INVARIANTS
+ if ((len + moff) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) {
+ if (rsm) {
+ panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u rsm:%p snd_una:%u rsm_start:%u flg:%x %u:%u:%u sr:%d ",
+ tp, bbr, len, moff,
+ sbavail(sb), rsm,
+ tp->snd_una, rsm->r_flags, rsm->r_start,
+ doing_retran_from,
+ picked_up_retran,
+ doing_tlp, sack_rxmit);
+ } else {
+ panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u sb_offset:%u snd_una:%u",
+ tp, bbr, len, moff, sbavail(sb), sb_offset, tp->snd_una);
+ }
+ }
+#endif
+ orig_len = len;
+ m->m_next = tcp_m_copym(
+#ifdef NETFLIX_COPY_ARGS
+ tp,
+#endif
+ mb, moff, &len,
+ if_hw_tsomaxsegcount,
+ if_hw_tsomaxsegsize, msb,
+ ((rsm == NULL) ? hw_tls : 0)
+#ifdef NETFLIX_COPY_ARGS
+ , &filled_all
+#endif
+ );
+ if (len <= maxseg && !force_tso) {
+ /*
+ * Must have ran out of mbufs for the copy
+ * shorten it to no longer need tso. Lets
+ * not put on sendalot since we are low on
+ * mbufs.
+ */
+ tso = 0;
+ }
+ if (m->m_next == NULL) {
+ SOCKBUF_UNLOCK(sb);
+ (void)m_free(m);
+ error = ENOBUFS;
+ sack_rxmit = 0;
+ goto out;
+ }
+ }
+#ifdef BBR_INVARIANTS
+ if (tso && len < maxseg) {
+ panic("tp:%p tso on, but len:%d < maxseg:%d",
+ tp, len, maxseg);
+ }
+ if (tso && if_hw_tsomaxsegcount) {
+ int32_t seg_cnt = 0;
+ struct mbuf *foo;
+
+ foo = m;
+ while (foo) {
+ seg_cnt++;
+ foo = foo->m_next;
+ }
+ if (seg_cnt > if_hw_tsomaxsegcount) {
+ panic("seg_cnt:%d > max:%d", seg_cnt, if_hw_tsomaxsegcount);
+ }
+ }
+#endif
+ /*
+ * If we're sending everything we've got, set PUSH. (This
+ * will keep happy those implementations which only give
+ * data to the user when a buffer fills or a PUSH comes in.)
+ */
+ if (sb_offset + len == sbused(sb) &&
+ sbused(sb) &&
+ !(flags & TH_SYN)) {
+ flags |= TH_PUSH;
+ }
+ SOCKBUF_UNLOCK(sb);
+ } else {
+ SOCKBUF_UNLOCK(sb);
+ if (tp->t_flags & TF_ACKNOW)
+ TCPSTAT_INC(tcps_sndacks);
+ else if (flags & (TH_SYN | TH_FIN | TH_RST))
+ TCPSTAT_INC(tcps_sndctrl);
+ else if (SEQ_GT(tp->snd_up, tp->snd_una))
+ TCPSTAT_INC(tcps_sndurg);
+ else
+ TCPSTAT_INC(tcps_sndwinup);
+
+ m = m_gethdr(M_NOWAIT, MT_DATA);
+ if (m == NULL) {
+ BBR_STAT_INC(bbr_failed_mbuf_aloc);
+ bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0);
+ error = ENOBUFS;
+ /* Fudge the send time since we could not send */
+ sack_rxmit = 0;
+ goto out;
+ }
+#ifdef INET6
+ if (isipv6 && (MHLEN < hdrlen + max_linkhdr) &&
+ MHLEN >= hdrlen) {
+ M_ALIGN(m, hdrlen);
+ } else
+#endif
+ m->m_data += max_linkhdr;
+ m->m_len = hdrlen;
+ }
+ SOCKBUF_UNLOCK_ASSERT(sb);
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+#ifdef MAC
+ mac_inpcb_create_mbuf(inp, m);
+#endif
+#ifdef INET6
+ if (isipv6) {
+ ip6 = mtod(m, struct ip6_hdr *);
+#ifdef NETFLIX_TCPOUDP
+ if (tp->t_port) {
+ udp = (struct udphdr *)((caddr_t)ip6 + ipoptlen + sizeof(struct ip6_hdr));
+ udp->uh_sport = htons(V_tcp_udp_tunneling_port);
+ udp->uh_dport = tp->t_port;
+ ulen = hdrlen + len - sizeof(struct ip6_hdr);
+ udp->uh_ulen = htons(ulen);
+ th = (struct tcphdr *)(udp + 1);
+ } else {
+#endif
+ th = (struct tcphdr *)(ip6 + 1);
+
+#ifdef NETFLIX_TCPOUDP
+ }
+#endif
+ tcpip_fillheaders(inp,
+#ifdef NETFLIX_TCPOUDP
+ tp->t_port,
+#endif
+ ip6, th);
+ } else
+#endif /* INET6 */
+ {
+ ip = mtod(m, struct ip *);
+#ifdef TCPDEBUG
+ ipov = (struct ipovly *)ip;
+#endif
+#ifdef NETFLIX_TCPOUDP
+ if (tp->t_port) {
+ udp = (struct udphdr *)((caddr_t)ip + ipoptlen + sizeof(struct ip));
+ udp->uh_sport = htons(V_tcp_udp_tunneling_port);
+ udp->uh_dport = tp->t_port;
+ ulen = hdrlen + len - sizeof(struct ip);
+ udp->uh_ulen = htons(ulen);
+ th = (struct tcphdr *)(udp + 1);
+ } else
+#endif
+ th = (struct tcphdr *)(ip + 1);
+ tcpip_fillheaders(inp,
+#ifdef NETFLIX_TCPOUDP
+ tp->t_port,
+#endif
+ ip, th);
+ }
+ /*
+ * If we are doing retransmissions, then snd_nxt will not reflect
+ * the first unsent octet. For ACK only packets, we do not want the
+ * sequence number of the retransmitted packet, we want the sequence
+ * number of the next unsent octet. So, if there is no data (and no
+ * SYN or FIN), use snd_max instead of snd_nxt when filling in
+ * ti_seq. But if we are in persist state, snd_max might reflect
+ * one byte beyond the right edge of the window, so use snd_nxt in
+ * that case, since we know we aren't doing a retransmission.
+ * (retransmit and persist are mutually exclusive...)
+ */
+ if (sack_rxmit == 0) {
+ if (len && ((flags & (TH_FIN | TH_SYN | TH_RST)) == 0)) {
+ /* New data (including new persists) */
+ th->th_seq = htonl(tp->snd_max);
+ bbr_seq = tp->snd_max;
+ } else if (flags & TH_SYN) {
+ /* Syn's always send from iss */
+ th->th_seq = htonl(tp->iss);
+ bbr_seq = tp->iss;
+ } else if (flags & TH_FIN) {
+ if (flags & TH_FIN && tp->t_flags & TF_SENTFIN) {
+ /*
+ * If we sent the fin already its 1 minus
+ * snd_max
+ */
+ th->th_seq = (htonl(tp->snd_max - 1));
+ bbr_seq = (tp->snd_max - 1);
+ } else {
+ /* First time FIN use snd_max */
+ th->th_seq = htonl(tp->snd_max);
+ bbr_seq = tp->snd_max;
+ }
+ } else if (flags & TH_RST) {
+ /*
+ * For a Reset send the last cum ack in sequence
+ * (this like any other choice may still generate a
+ * challenge ack, if a ack-update packet is in
+ * flight).
+ */
+ th->th_seq = htonl(tp->snd_una);
+ bbr_seq = tp->snd_una;
+ } else {
+ /*
+ * len == 0 and not persist we use snd_max, sending
+ * an ack unless we have sent the fin then its 1
+ * minus.
+ */
+ /*
+ * XXXRRS Question if we are in persists and we have
+ * nothing outstanding to send and we have not sent
+ * a FIN, we will send an ACK. In such a case it
+ * might be better to send (tp->snd_una - 1) which
+ * would force the peer to ack.
+ */
+ if (tp->t_flags & TF_SENTFIN) {
+ th->th_seq = htonl(tp->snd_max - 1);
+ bbr_seq = (tp->snd_max - 1);
+ } else {
+ th->th_seq = htonl(tp->snd_max);
+ bbr_seq = tp->snd_max;
+ }
+ }
+ } else {
+ /* All retransmits use the rsm to guide the send */
+ th->th_seq = htonl(rsm->r_start);
+ bbr_seq = rsm->r_start;
+ }
+ th->th_ack = htonl(tp->rcv_nxt);
+ if (optlen) {
+ bcopy(opt, th + 1, optlen);
+ th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
+ }
+ th->th_flags = flags;
+ /*
+ * Calculate receive window. Don't shrink window, but avoid silly
+ * window syndrome.
+ */
+ if ((flags & TH_RST) || ((recwin < (so->so_rcv.sb_hiwat / 4) &&
+ recwin < maxseg)))
+ recwin = 0;
+ if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
+ recwin < (tp->rcv_adv - tp->rcv_nxt))
+ recwin = (tp->rcv_adv - tp->rcv_nxt);
+ if (recwin > TCP_MAXWIN << tp->rcv_scale)
+ recwin = TCP_MAXWIN << tp->rcv_scale;
+
+ /*
+ * According to RFC1323 the window field in a SYN (i.e., a <SYN> or
+ * <SYN,ACK>) segment itself is never scaled. The <SYN,ACK> case is
+ * handled in syncache.
+ */
+ if (flags & TH_SYN)
+ th->th_win = htons((u_short)
+ (min(sbspace(&so->so_rcv), TCP_MAXWIN)));
+ else
+ th->th_win = htons((u_short)(recwin >> tp->rcv_scale));
+ /*
+ * Adjust the RXWIN0SENT flag - indicate that we have advertised a 0
+ * window. This may cause the remote transmitter to stall. This
+ * flag tells soreceive() to disable delayed acknowledgements when
+ * draining the buffer. This can occur if the receiver is
+ * attempting to read more data than can be buffered prior to
+ * transmitting on the connection.
+ */
+ if (th->th_win == 0) {
+ tp->t_sndzerowin++;
+ tp->t_flags |= TF_RXWIN0SENT;
+ } else
+ tp->t_flags &= ~TF_RXWIN0SENT;
+ if (SEQ_GT(tp->snd_up, tp->snd_max)) {
+ th->th_urp = htons((u_short)(tp->snd_up - tp->snd_max));
+ th->th_flags |= TH_URG;
+ } else
+ /*
+ * If no urgent pointer to send, then we pull the urgent
+ * pointer to the left edge of the send window so that it
+ * doesn't drift into the send window on sequence number
+ * wraparound.
+ */
+ tp->snd_up = tp->snd_una; /* drag it along */
+
+#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
+ if (to.to_flags & TOF_SIGNATURE) {
+ /*
+ * Calculate MD5 signature and put it into the place
+ * determined before. NOTE: since TCP options buffer doesn't
+ * point into mbuf's data, calculate offset and use it.
+ */
+ if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th,
+ (u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
+ /*
+ * Do not send segment if the calculation of MD5
+ * digest has failed.
+ */
+ goto out;
+ }
+ }
+#endif
+
+ /*
+ * Put TCP length in extended header, and then checksum extended
+ * header and data.
+ */
+ m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */
+#ifdef INET6
+ if (isipv6) {
+ /*
+ * ip6_plen is not need to be filled now, and will be filled
+ * in ip6_output.
+ */
+#ifdef NETFLIX_TCPOUDP
+ if (tp->t_port) {
+ m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
+ m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
+ udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
+ th->th_sum = htons(0);
+ UDPSTAT_INC(udps_opackets);
+ } else {
+#endif
+ csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
+ m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
+ th->th_sum = in6_cksum_pseudo(ip6, sizeof(struct tcphdr) +
+ optlen + len, IPPROTO_TCP, 0);
+#ifdef NETFLIX_TCPOUDP
+ }
+#endif
+ }
+#endif
+#if defined(INET6) && defined(INET)
+ else
+#endif
+#ifdef INET
+ {
+#ifdef NETFLIX_TCPOUDP
+ if (tp->t_port) {
+ m->m_pkthdr.csum_flags = CSUM_UDP;
+ m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
+ udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
+ ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
+ th->th_sum = htons(0);
+ UDPSTAT_INC(udps_opackets);
+ } else {
+#endif
+ csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP;
+ m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
+ th->th_sum = in_pseudo(ip->ip_src.s_addr,
+ ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
+ IPPROTO_TCP + len + optlen));
+#ifdef NETFLIX_TCPOUDP
+ }
+#endif
+ /* IP version must be set here for ipv4/ipv6 checking later */
+ KASSERT(ip->ip_v == IPVERSION,
+ ("%s: IP version incorrect: %d", __func__, ip->ip_v));
+ }
+#endif
+
+ /*
+ * Enable TSO and specify the size of the segments. The TCP pseudo
+ * header checksum is always provided. XXX: Fixme: This is currently
+ * not the case for IPv6.
+ */
+ if (tso || force_tso) {
+ KASSERT(force_tso || len > maxseg,
+ ("%s: len:%d <= tso_segsz:%d", __func__, len, maxseg));
+ m->m_pkthdr.csum_flags |= CSUM_TSO;
+ csum_flags |= CSUM_TSO;
+ m->m_pkthdr.tso_segsz = maxseg;
+ }
+ KASSERT(len + hdrlen == m_length(m, NULL),
+ ("%s: mbuf chain different than expected: %d + %u != %u",
+ __func__, len, hdrlen, m_length(m, NULL)));
+
+#ifdef TCP_HHOOK
+ /* Run HHOOK_TC_ESTABLISHED_OUT helper hooks. */
+ hhook_run_tcp_est_out(tp, th, &to, len, tso);
+#endif
+#ifdef TCPDEBUG
+ /*
+ * Trace.
+ */
+ if (so->so_options & SO_DEBUG) {
+ u_short save = 0;
+
+#ifdef INET6
+ if (!isipv6)
+#endif
+ {
+ save = ipov->ih_len;
+ ipov->ih_len = htons(m->m_pkthdr.len /* - hdrlen +
+ * (th->th_off << 2) */ );
+ }
+ tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0);
+#ifdef INET6
+ if (!isipv6)
+#endif
+ ipov->ih_len = save;
+ }
+#endif /* TCPDEBUG */
+
+ /* Log to the black box */
+ if (tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ bbr_fill_in_logging_data(bbr, &log.u_bbr, cts);
+ /* Record info on type of transmission */
+ log.u_bbr.flex1 = bbr->r_ctl.rc_hptsi_agg_delay;
+ log.u_bbr.flex2 = (bbr->r_recovery_bw << 3);
+ log.u_bbr.flex3 = maxseg;
+ log.u_bbr.flex4 = delay_calc;
+ /* Encode filled_all into the upper flex5 bit */
+ log.u_bbr.flex5 = bbr->rc_past_init_win;
+ log.u_bbr.flex5 <<= 1;
+ log.u_bbr.flex5 |= bbr->rc_no_pacing;
+ log.u_bbr.flex5 <<= 29;
+ if (filled_all)
+ log.u_bbr.flex5 |= 0x80000000;
+ log.u_bbr.flex5 |= tp->t_maxseg;
+ log.u_bbr.flex6 = bbr->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex7 = (bbr->rc_bbr_state << 8) | bbr_state_val(bbr);
+ /* lets poke in the low and the high here for debugging */
+ log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg;
+ if (rsm || sack_rxmit) {
+ if (doing_tlp)
+ log.u_bbr.flex8 = 2;
+ else
+ log.u_bbr.flex8 = 1;
+ } else {
+ log.u_bbr.flex8 = 0;
+ }
+ lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK,
+ len, &log, false, NULL, NULL, 0, tv);
+ } else {
+ lgb = NULL;
+ }
+ /*
+ * Fill in IP length and desired time to live and send to IP level.
+ * There should be a better way to handle ttl and tos; we could keep
+ * them in the template, but need a way to checksum without them.
+ */
+ /*
+ * m->m_pkthdr.len should have been set before cksum calcuration,
+ * because in6_cksum() need it.
+ */
+#ifdef INET6
+ if (isipv6) {
+ /*
+ * we separately set hoplimit for every segment, since the
+ * user might want to change the value via setsockopt. Also,
+ * desired default hop limit might be changed via Neighbor
+ * Discovery.
+ */
+ ip6->ip6_hlim = in6_selecthlim(inp, NULL);
+
+ /*
+ * Set the packet size here for the benefit of DTrace
+ * probes. ip6_output() will set it properly; it's supposed
+ * to include the option header lengths as well.
+ */
+ ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
+
+ if (V_path_mtu_discovery && maxseg > V_tcp_minmss)
+ tp->t_flags2 |= TF2_PLPMTU_PMTUD;
+ else
+ tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
+
+ if (tp->t_state == TCPS_SYN_SENT)
+ TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th);
+
+ TCP_PROBE5(send, NULL, tp, ip6, tp, th);
+ /* TODO: IPv6 IP6TOS_ECT bit on */
+ error = ip6_output(m, inp->in6p_outputopts,
+ &inp->inp_route6,
+ ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0),
+ NULL, NULL, inp);
+
+ if (error == EMSGSIZE && inp->inp_route6.ro_rt != NULL)
+ mtu = inp->inp_route6.ro_rt->rt_mtu;
+ }
+#endif /* INET6 */
+#if defined(INET) && defined(INET6)
+ else
+#endif
+#ifdef INET
+ {
+ ip->ip_len = htons(m->m_pkthdr.len);
+#ifdef INET6
+ if (isipv6)
+ ip->ip_ttl = in6_selecthlim(inp, NULL);
+#endif /* INET6 */
+ /*
+ * If we do path MTU discovery, then we set DF on every
+ * packet. This might not be the best thing to do according
+ * to RFC3390 Section 2. However the tcp hostcache migitates
+ * the problem so it affects only the first tcp connection
+ * with a host.
+ *
+ * NB: Don't set DF on small MTU/MSS to have a safe
+ * fallback.
+ */
+ if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
+ tp->t_flags2 |= TF2_PLPMTU_PMTUD;
+ if (tp->t_port == 0 || len < V_tcp_minmss) {
+ ip->ip_off |= htons(IP_DF);
+ }
+ } else {
+ tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
+ }
+
+ if (tp->t_state == TCPS_SYN_SENT)
+ TCP_PROBE5(connect__request, NULL, tp, ip, tp, th);
+
+ TCP_PROBE5(send, NULL, tp, ip, tp, th);
+
+ error = ip_output(m, inp->inp_options, &inp->inp_route,
+ ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0,
+ inp);
+ if (error == EMSGSIZE && inp->inp_route.ro_rt != NULL)
+ mtu = inp->inp_route.ro_rt->rt_mtu;
+ }
+#endif /* INET */
+out:
+
+ if (lgb) {
+ lgb->tlb_errno = error;
+ lgb = NULL;
+ }
+ /*
+ * In transmit state, time the transmission and arrange for the
+ * retransmit. In persist state, just set snd_max.
+ */
+ if (error == 0) {
+ if (TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->t_flags & TF_SACK_PERMIT) &&
+ tp->rcv_numsacks > 0)
+ tcp_clean_dsack_blocks(tp);
+ /* We sent an ack clear the bbr_segs_rcvd count */
+ bbr->output_error_seen = 0;
+ bbr->oerror_cnt = 0;
+ bbr->bbr_segs_rcvd = 0;
+ if (len == 0)
+ counter_u64_add(bbr_out_size[TCP_MSS_ACCT_SNDACK], 1);
+ else if (hw_tls) {
+ if (filled_all ||
+ (len >= bbr->r_ctl.rc_pace_max_segs))
+ BBR_STAT_INC(bbr_meets_tso_thresh);
+ else {
+ if (doing_tlp) {
+ BBR_STAT_INC(bbr_miss_tlp);
+ bbr_log_type_hrdwtso(tp, bbr, len, 1, what_we_can);
+
+
+ } else if (rsm) {
+ BBR_STAT_INC(bbr_miss_retran);
+ bbr_log_type_hrdwtso(tp, bbr, len, 2, what_we_can);
+ } else if ((ctf_outstanding(tp) + bbr->r_ctl.rc_pace_max_segs) > sbavail(sb)) {
+ BBR_STAT_INC(bbr_miss_tso_app);
+ bbr_log_type_hrdwtso(tp, bbr, len, 3, what_we_can);
+ } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_pace_max_segs) > tp->snd_cwnd) {
+ BBR_STAT_INC(bbr_miss_tso_cwnd);
+ bbr_log_type_hrdwtso(tp, bbr, len, 4, what_we_can);
+ } else if ((ctf_outstanding(tp) + bbr->r_ctl.rc_pace_max_segs) > tp->snd_wnd) {
+ BBR_STAT_INC(bbr_miss_tso_rwnd);
+ bbr_log_type_hrdwtso(tp, bbr, len, 5, what_we_can);
+ } else {
+ BBR_STAT_INC(bbr_miss_unknown);
+ bbr_log_type_hrdwtso(tp, bbr, len, 6, what_we_can);
+ }
+ }
+ }
+ /* Do accounting for new sends */
+ if ((len > 0) && (rsm == NULL)) {
+ int idx;
+ if (tp->snd_una == tp->snd_max) {
+ /*
+ * Special case to match google, when
+ * nothing is in flight the delivered
+ * time does get updated to the current
+ * time (see tcp_rate_bsd.c).
+ */
+ bbr->r_ctl.rc_del_time = cts;
+ }
+ if (len >= maxseg) {
+ idx = (len / maxseg) + 3;
+ if (idx >= TCP_MSS_ACCT_ATIMER)
+ counter_u64_add(bbr_out_size[(TCP_MSS_ACCT_ATIMER - 1)], 1);
+ else
+ counter_u64_add(bbr_out_size[idx], 1);
+ } else {
+ /* smaller than a MSS */
+ idx = len / (bbr_hptsi_bytes_min - bbr->rc_last_options);
+ if (idx >= TCP_MSS_SMALL_MAX_SIZE_DIV)
+ idx = (TCP_MSS_SMALL_MAX_SIZE_DIV - 1);
+ counter_u64_add(bbr_out_size[(idx + TCP_MSS_SMALL_SIZE_OFF)], 1);
+ }
+ }
+ }
+ abandon = 0;
+ /*
+ * We must do the send accounting before we log the output,
+ * otherwise the state of the rsm could change and we account to the
+ * wrong bucket.
+ */
+ if (len > 0) {
+ bbr_do_send_accounting(tp, bbr, rsm, len, error);
+ if (error == 0) {
+ if (tp->snd_una == tp->snd_max)
+ bbr->r_ctl.rc_tlp_rxt_last_time = cts;
+ }
+ }
+ bbr_log_output(bbr, tp, &to, len, bbr_seq, (uint8_t) flags, error,
+ cts, mb, &abandon, rsm, 0, sb);
+ if (abandon) {
+ /*
+ * If bbr_log_output destroys the TCB or sees a TH_RST being
+ * sent we should hit this condition.
+ */
+ return (0);
+ }
+ if (((tp->t_flags & TF_FORCEDATA) == 0) ||
+ (bbr->rc_in_persist == 0)) {
+ /*
+ * Advance snd_nxt over sequence space of this segment.
+ */
+ if (error)
+ /* We don't log or do anything with errors */
+ goto skip_upd;
+
+ if (tp->snd_una == tp->snd_max &&
+ (len || (flags & (TH_SYN | TH_FIN)))) {
+ /*
+ * Update the time we just added data since none was
+ * outstanding.
+ */
+ bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__);
+ bbr->rc_tp->t_acktime = ticks;
+ }
+ if (flags & (TH_SYN | TH_FIN) && (rsm == NULL)) {
+ if (flags & TH_SYN) {
+ tp->snd_max++;
+ }
+ if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) {
+ tp->snd_max++;
+ tp->t_flags |= TF_SENTFIN;
+ }
+ }
+ if (sack_rxmit == 0)
+ tp->snd_max += len;
+skip_upd:
+ if ((error == 0) && len)
+ tot_len += len;
+ } else {
+ /* Persists case */
+ int32_t xlen = len;
+
+ if (error)
+ goto nomore;
+
+ if (flags & TH_SYN)
+ ++xlen;
+ if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) {
+ ++xlen;
+ tp->t_flags |= TF_SENTFIN;
+ }
+ if (xlen && (tp->snd_una == tp->snd_max)) {
+ /*
+ * Update the time we just added data since none was
+ * outstanding.
+ */
+ bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__);
+ bbr->rc_tp->t_acktime = ticks;
+ }
+ if (sack_rxmit == 0)
+ tp->snd_max += xlen;
+ tot_len += (len + optlen + ipoptlen);
+ }
+nomore:
+ if (error) {
+ /*
+ * Failures do not advance the seq counter above. For the
+ * case of ENOBUFS we will fall out and become ack-clocked.
+ * capping the cwnd at the current flight.
+ * Everything else will just have to retransmit with the timer
+ * (no pacer).
+ */
+ SOCKBUF_UNLOCK_ASSERT(sb);
+ BBR_STAT_INC(bbr_saw_oerr);
+ /* Clear all delay/early tracks */
+ bbr->r_ctl.rc_hptsi_agg_delay = 0;
+ bbr->r_ctl.rc_agg_early = 0;
+ bbr->r_agg_early_set = 0;
+ bbr->output_error_seen = 1;
+ if (bbr->oerror_cnt < 0xf)
+ bbr->oerror_cnt++;
+ if (bbr_max_net_error_cnt && (bbr->oerror_cnt >= bbr_max_net_error_cnt)) {
+ /* drop the session */
+ tcp_set_inp_to_drop(inp, ENETDOWN);
+ }
+ switch (error) {
+ case ENOBUFS:
+ /*
+ * Make this guy have to get ack's to send
+ * more but lets make sure we don't
+ * slam him below a T-O (1MSS).
+ */
+ if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) {
+ tp->snd_cwnd = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)) - maxseg;
+ if (tp->snd_cwnd < maxseg)
+ tp->snd_cwnd = maxseg;
+ }
+ slot = (bbr_error_base_paceout + 1) << bbr->oerror_cnt;
+ BBR_STAT_INC(bbr_saw_enobuf);
+ if (bbr->bbr_hdrw_pacing)
+ counter_u64_add(bbr_hdwr_pacing_enobuf, 1);
+ else
+ counter_u64_add(bbr_nohdwr_pacing_enobuf, 1);
+ /*
+ * Here even in the enobuf's case we want to do our
+ * state update. The reason being we may have been
+ * called by the input function. If so we have had
+ * things change.
+ */
+ error = 0;
+ goto enobufs;
+ case EMSGSIZE:
+ /*
+ * For some reason the interface we used initially
+ * to send segments changed to another or lowered
+ * its MTU. If TSO was active we either got an
+ * interface without TSO capabilits or TSO was
+ * turned off. If we obtained mtu from ip_output()
+ * then update it and try again.
+ */
+ /* Turn on tracing (or try to) */
+ {
+ int old_maxseg;
+
+ old_maxseg = tp->t_maxseg;
+ BBR_STAT_INC(bbr_saw_emsgsiz);
+ bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, csum_flags, tso, cts);
+ if (mtu != 0)
+ tcp_mss_update(tp, -1, mtu, NULL, NULL);
+ if (old_maxseg <= tp->t_maxseg) {
+ /* Huh it did not shrink? */
+ tp->t_maxseg = old_maxseg - 40;
+ bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, 0, tso, cts);
+ }
+ tp->t_flags &= ~TF_FORCEDATA;
+ /*
+ * Nuke all other things that can interfere
+ * with slot
+ */
+ if ((tot_len + len) && (len >= tp->t_maxseg)) {
+ slot = bbr_get_pacing_delay(bbr,
+ bbr->r_ctl.rc_bbr_hptsi_gain,
+ (tot_len + len), cts, 0);
+ if (slot < bbr_error_base_paceout)
+ slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt;
+ } else
+ slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt;
+ bbr->rc_output_starts_timer = 1;
+ bbr_start_hpts_timer(bbr, tp, cts, 10, slot,
+ tot_len);
+ return (error);
+ }
+ case EPERM:
+ tp->t_softerror = error;
+ /* Fall through */
+ case EHOSTDOWN:
+ case EHOSTUNREACH:
+ case ENETDOWN:
+ case ENETUNREACH:
+ if (TCPS_HAVERCVDSYN(tp->t_state)) {
+ tp->t_softerror = error;
+ }
+ /* FALLTHROUGH */
+ default:
+ tp->t_flags &= ~TF_FORCEDATA;
+ slot = (bbr_error_base_paceout + 3) << bbr->oerror_cnt;
+ bbr->rc_output_starts_timer = 1;
+ bbr_start_hpts_timer(bbr, tp, cts, 11, slot, 0);
+ return (error);
+ }
+#ifdef NETFLIX_STATS
+ } else if (((tp->t_flags & TF_GPUTINPROG) == 0) &&
+ len &&
+ (rsm == NULL) &&
+ (bbr->rc_in_persist == 0)) {
+ tp->gput_seq = bbr_seq;
+ tp->gput_ack = bbr_seq +
+ min(sbavail(&so->so_snd) - sb_offset, sendwin);
+ tp->gput_ts = cts;
+ tp->t_flags |= TF_GPUTINPROG;
+#endif
+ }
+ TCPSTAT_INC(tcps_sndtotal);
+ if ((bbr->bbr_hdw_pace_ena) &&
+ (bbr->bbr_attempt_hdwr_pace == 0) &&
+ (bbr->rc_past_init_win) &&
+ (bbr->rc_bbr_state != BBR_STATE_STARTUP) &&
+ (get_filter_value(&bbr->r_ctl.rc_delrate)) &&
+ (inp->inp_route.ro_rt &&
+ inp->inp_route.ro_rt->rt_ifp)) {
+ /*
+ * We are past the initial window and
+ * have at least one measurement so we
+ * could use hardware pacing if its available.
+ * We have an interface and we have not attempted
+ * to setup hardware pacing, lets try to now.
+ */
+ uint64_t rate_wanted;
+ int err = 0;
+
+ rate_wanted = bbr_get_hardware_rate(bbr);
+ bbr->bbr_attempt_hdwr_pace = 1;
+ bbr->r_ctl.crte = tcp_set_pacing_rate(bbr->rc_tp,
+ inp->inp_route.ro_rt->rt_ifp,
+ rate_wanted,
+ (RS_PACING_GEQ|RS_PACING_SUB_OK),
+ &err);
+ if (bbr->r_ctl.crte) {
+ bbr_type_log_hdwr_pacing(bbr,
+ bbr->r_ctl.crte->ptbl->rs_ifp,
+ rate_wanted,
+ bbr->r_ctl.crte->rate,
+ __LINE__, cts, err);
+ BBR_STAT_INC(bbr_hdwr_rl_add_ok);
+ counter_u64_add(bbr_flows_nohdwr_pacing, -1);
+ counter_u64_add(bbr_flows_whdwr_pacing, 1);
+ bbr->bbr_hdrw_pacing = 1;
+ /* Now what is our gain status? */
+ if (bbr->r_ctl.crte->rate < rate_wanted) {
+ /* We have a problem */
+ bbr_setup_less_of_rate(bbr, cts,
+ bbr->r_ctl.crte->rate, rate_wanted);
+ } else {
+ /* We are good */
+ bbr->gain_is_limited = 0;
+ bbr->skip_gain = 0;
+ }
+ tcp_bbr_tso_size_check(bbr, cts);
+ } else {
+ bbr_type_log_hdwr_pacing(bbr,
+ inp->inp_route.ro_rt->rt_ifp,
+ rate_wanted,
+ 0,
+ __LINE__, cts, err);
+ BBR_STAT_INC(bbr_hdwr_rl_add_fail);
+ }
+ }
+ if (bbr->bbr_hdrw_pacing) {
+ /*
+ * Worry about cases where the route
+ * changes or something happened that we
+ * lost our hardware pacing possibly during
+ * the last ip_output call.
+ */
+ if (inp->inp_snd_tag == NULL) {
+ /* A change during ip output disabled hw pacing? */
+ bbr->bbr_hdrw_pacing = 0;
+ } else if ((inp->inp_route.ro_rt == NULL) ||
+ (inp->inp_route.ro_rt->rt_ifp != inp->inp_snd_tag->ifp)) {
+ /*
+ * We had an interface or route change,
+ * detach from the current hdwr pacing
+ * and setup to re-attempt next go
+ * round.
+ */
+ bbr->bbr_hdrw_pacing = 0;
+ bbr->bbr_attempt_hdwr_pace = 0;
+ tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp);
+ tcp_bbr_tso_size_check(bbr, cts);
+ }
+ }
+ /*
+ * Data sent (as far as we can tell). If this advertises a larger
+ * window than any other segment, then remember the size of the
+ * advertised window. Any pending ACK has now been sent.
+ */
+ if (SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv))
+ tp->rcv_adv = tp->rcv_nxt + recwin;
+
+ tp->last_ack_sent = tp->rcv_nxt;
+ if ((error == 0) &&
+ (bbr->r_ctl.rc_pace_max_segs > tp->t_maxseg) &&
+ (doing_tlp == 0) &&
+ (tso == 0) &&
+ (hw_tls == 0) &&
+ (len > 0) &&
+ ((flags & TH_RST) == 0) &&
+ (IN_RECOVERY(tp->t_flags) == 0) &&
+ (bbr->rc_in_persist == 0) &&
+ ((tp->t_flags & TF_FORCEDATA) == 0) &&
+ (tot_len < bbr->r_ctl.rc_pace_max_segs)) {
+ /*
+ * For non-tso we need to goto again until we have sent out
+ * enough data to match what we are hptsi out every hptsi
+ * interval.
+ */
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ /* Make sure snd_nxt is drug up */
+ tp->snd_nxt = tp->snd_max;
+ }
+ if (rsm != NULL) {
+ rsm = NULL;
+ goto skip_again;
+ }
+ rsm = NULL;
+ sack_rxmit = 0;
+ tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA);
+ goto again;
+ }
+skip_again:
+ if (((flags & (TH_RST | TH_SYN | TH_FIN)) == 0) && tot_len) {
+ /*
+ * Calculate/Re-Calculate the hptsi slot in usecs based on
+ * what we have sent so far
+ */
+ slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0);
+ if (bbr->rc_no_pacing)
+ slot = 0;
+ }
+ tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA);
+enobufs:
+ if (bbr->rc_use_google == 0)
+ bbr_check_bbr_for_state(bbr, cts, __LINE__, 0);
+ bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked +
+ bbr->r_ctl.rc_lost_bytes)));
+ bbr->rc_output_starts_timer = 1;
+ if (bbr->bbr_use_rack_cheat &&
+ (more_to_rxt ||
+ ((bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts)) != NULL))) {
+ /* Rack cheats and shotguns out all rxt's 1ms apart */
+ if (slot > 1000)
+ slot = 1000;
+ }
+ if (bbr->bbr_hdrw_pacing && (bbr->hw_pacing_set == 0)) {
+ /*
+ * We don't change the tso size until some number of sends
+ * to give the hardware commands time to get down
+ * to the interface.
+ */
+ bbr->r_ctl.bbr_hdwr_cnt_noset_snt++;
+ if (bbr->r_ctl.bbr_hdwr_cnt_noset_snt >= bbr_hdwr_pacing_delay_cnt) {
+ bbr->hw_pacing_set = 1;
+ tcp_bbr_tso_size_check(bbr, cts);
+ }
+ }
+ bbr_start_hpts_timer(bbr, tp, cts, 12, slot, tot_len);
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ /* Make sure snd_nxt is drug up */
+ tp->snd_nxt = tp->snd_max;
+ }
+ return (error);
+
+}
+
+/*
+ * See bbr_output_wtime() for return values.
+ */
+static int
+bbr_output(struct tcpcb *tp)
+{
+ int32_t ret;
+ struct timeval tv;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ INP_WLOCK_ASSERT(tp->t_inpcb);
+ (void)tcp_get_usecs(&tv);
+ ret = bbr_output_wtime(tp, &tv);
+ return (ret);
+}
+
+static void
+bbr_mtu_chg(struct tcpcb *tp)
+{
+ struct tcp_bbr *bbr;
+ struct bbr_sendmap *rsm, *frsm = NULL;
+ uint32_t maxseg;
+
+ /*
+ * The MTU has changed. a) Clear the sack filter. b) Mark everything
+ * over the current size as SACK_PASS so a retransmit will occur.
+ */
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ maxseg = tp->t_maxseg - bbr->rc_last_options;
+ sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
+ TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) {
+ /* Don't mess with ones acked (by sack?) */
+ if (rsm->r_flags & BBR_ACKED)
+ continue;
+ if ((rsm->r_end - rsm->r_start) > maxseg) {
+ /*
+ * We mark sack-passed on all the previous large
+ * sends we did. This will force them to retransmit.
+ */
+ rsm->r_flags |= BBR_SACK_PASSED;
+ if (((rsm->r_flags & BBR_MARKED_LOST) == 0) &&
+ bbr_is_lost(bbr, rsm, bbr->r_ctl.rc_rcvtime)) {
+ bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start;
+ bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start;
+ rsm->r_flags |= BBR_MARKED_LOST;
+ }
+ if (frsm == NULL)
+ frsm = rsm;
+ }
+ }
+ if (frsm) {
+ bbr->r_ctl.rc_resend = frsm;
+ }
+}
+
+/*
+ * bbr_ctloutput() must drop the inpcb lock before performing copyin on
+ * socket option arguments. When it re-acquires the lock after the copy, it
+ * has to revalidate that the connection is still valid for the socket
+ * option.
+ */
+static int
+bbr_set_sockopt(struct socket *so, struct sockopt *sopt,
+ struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr)
+{
+ int32_t error = 0, optval;
+
+ switch (sopt->sopt_name) {
+ case TCP_RACK_PACE_MAX_SEG:
+ case TCP_RACK_MIN_TO:
+ case TCP_RACK_REORD_THRESH:
+ case TCP_RACK_REORD_FADE:
+ case TCP_RACK_TLP_THRESH:
+ case TCP_RACK_PKT_DELAY:
+ case TCP_BBR_ALGORITHM:
+ case TCP_BBR_TSLIMITS:
+ case TCP_BBR_IWINTSO:
+ case TCP_BBR_RECFORCE:
+ case TCP_BBR_STARTUP_PG:
+ case TCP_BBR_DRAIN_PG:
+ case TCP_BBR_RWND_IS_APP:
+ case TCP_BBR_PROBE_RTT_INT:
+ case TCP_BBR_PROBE_RTT_GAIN:
+ case TCP_BBR_PROBE_RTT_LEN:
+ case TCP_BBR_STARTUP_LOSS_EXIT:
+ case TCP_BBR_USEDEL_RATE:
+ case TCP_BBR_MIN_RTO:
+ case TCP_BBR_MAX_RTO:
+ case TCP_BBR_PACE_PER_SEC:
+ case TCP_DELACK:
+ case TCP_BBR_PACE_DEL_TAR:
+ case TCP_BBR_SEND_IWND_IN_TSO:
+ case TCP_BBR_EXTRA_STATE:
+ case TCP_BBR_UTTER_MAX_TSO:
+ case TCP_BBR_MIN_TOPACEOUT:
+ case TCP_BBR_FLOOR_MIN_TSO:
+ case TCP_BBR_TSTMP_RAISES:
+ case TCP_BBR_POLICER_DETECT:
+ case TCP_BBR_USE_RACK_CHEAT:
+ case TCP_DATA_AFTER_CLOSE:
+ case TCP_BBR_HDWR_PACE:
+ case TCP_BBR_PACE_SEG_MAX:
+ case TCP_BBR_PACE_SEG_MIN:
+ case TCP_BBR_PACE_CROSS:
+ case TCP_BBR_PACE_OH:
+#ifdef NETFLIX_PEAKRATE
+ case TCP_MAXPEAKRATE:
+#endif
+ case TCP_BBR_TMR_PACE_OH:
+ case TCP_BBR_RACK_RTT_USE:
+ case TCP_BBR_RETRAN_WTSO:
+ break;
+ default:
+ return (tcp_default_ctloutput(so, sopt, inp, tp));
+ break;
+ }
+ INP_WUNLOCK(inp);
+ error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval));
+ if (error)
+ return (error);
+ INP_WLOCK(inp);
+ if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+ INP_WUNLOCK(inp);
+ return (ECONNRESET);
+ }
+ tp = intotcpcb(inp);
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ switch (sopt->sopt_name) {
+ case TCP_BBR_PACE_PER_SEC:
+ BBR_OPTS_INC(tcp_bbr_pace_per_sec);
+ bbr->r_ctl.bbr_hptsi_per_second = optval;
+ break;
+ case TCP_BBR_PACE_DEL_TAR:
+ BBR_OPTS_INC(tcp_bbr_pace_del_tar);
+ bbr->r_ctl.bbr_hptsi_segments_delay_tar = optval;
+ break;
+ case TCP_BBR_PACE_SEG_MAX:
+ BBR_OPTS_INC(tcp_bbr_pace_seg_max);
+ bbr->r_ctl.bbr_hptsi_segments_max = optval;
+ break;
+ case TCP_BBR_PACE_SEG_MIN:
+ BBR_OPTS_INC(tcp_bbr_pace_seg_min);
+ bbr->r_ctl.bbr_hptsi_bytes_min = optval;
+ break;
+ case TCP_BBR_PACE_CROSS:
+ BBR_OPTS_INC(tcp_bbr_pace_cross);
+ bbr->r_ctl.bbr_cross_over = optval;
+ break;
+ case TCP_BBR_ALGORITHM:
+ BBR_OPTS_INC(tcp_bbr_algorithm);
+ if (optval && (bbr->rc_use_google == 0)) {
+ /* Turn on the google mode */
+ bbr_google_mode_on(bbr);
+ if ((optval > 3) && (optval < 500)) {
+ /*
+ * Must be at least greater than .3%
+ * and must be less than 50.0%.
+ */
+ bbr->r_ctl.bbr_google_discount = optval;
+ }
+ } else if ((optval == 0) && (bbr->rc_use_google == 1)) {
+ /* Turn off the google mode */
+ bbr_google_mode_off(bbr);
+ }
+ break;
+ case TCP_BBR_TSLIMITS:
+ BBR_OPTS_INC(tcp_bbr_tslimits);
+ if (optval == 1)
+ bbr->rc_use_ts_limit = 1;
+ else if (optval == 0)
+ bbr->rc_use_ts_limit = 0;
+ else
+ error = EINVAL;
+ break;
+
+ case TCP_BBR_IWINTSO:
+ BBR_OPTS_INC(tcp_bbr_iwintso);
+ if ((optval >= 0) && (optval < 128)) {
+ uint32_t twin;
+
+ bbr->rc_init_win = optval;
+ twin = bbr_initial_cwnd(bbr, tp);
+ if ((bbr->rc_past_init_win == 0) && (twin > tp->snd_cwnd))
+ tp->snd_cwnd = twin;
+ else
+ error = EBUSY;
+ } else
+ error = EINVAL;
+ break;
+ case TCP_BBR_STARTUP_PG:
+ BBR_OPTS_INC(tcp_bbr_startup_pg);
+ if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) {
+ bbr->r_ctl.rc_startup_pg = optval;
+ if (bbr->rc_bbr_state == BBR_STATE_STARTUP) {
+ bbr->r_ctl.rc_bbr_hptsi_gain = optval;
+ }
+ } else
+ error = EINVAL;
+ break;
+ case TCP_BBR_DRAIN_PG:
+ BBR_OPTS_INC(tcp_bbr_drain_pg);
+ if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE))
+ bbr->r_ctl.rc_drain_pg = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_BBR_PROBE_RTT_LEN:
+ BBR_OPTS_INC(tcp_bbr_probertt_len);
+ if (optval <= 1)
+ reset_time_small(&bbr->r_ctl.rc_rttprop, (optval * USECS_IN_SECOND));
+ else
+ error = EINVAL;
+ break;
+ case TCP_BBR_PROBE_RTT_GAIN:
+ BBR_OPTS_INC(tcp_bbr_probertt_gain);
+ if (optval <= BBR_UNIT)
+ bbr->r_ctl.bbr_rttprobe_gain_val = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_BBR_PROBE_RTT_INT:
+ BBR_OPTS_INC(tcp_bbr_probe_rtt_int);
+ if (optval > 1000)
+ bbr->r_ctl.rc_probertt_int = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_BBR_MIN_TOPACEOUT:
+ BBR_OPTS_INC(tcp_bbr_topaceout);
+ if (optval == 0) {
+ bbr->no_pacing_until = 0;
+ bbr->rc_no_pacing = 0;
+ } else if (optval <= 0x00ff) {
+ bbr->no_pacing_until = optval;
+ if ((bbr->r_ctl.rc_pkt_epoch < bbr->no_pacing_until) &&
+ (bbr->rc_bbr_state == BBR_STATE_STARTUP)){
+ /* Turn on no pacing */
+ bbr->rc_no_pacing = 1;
+ }
+ } else
+ error = EINVAL;
+ break;
+ case TCP_BBR_STARTUP_LOSS_EXIT:
+ BBR_OPTS_INC(tcp_bbr_startup_loss_exit);
+ bbr->rc_loss_exit = optval;
+ break;
+ case TCP_BBR_USEDEL_RATE:
+ error = EINVAL;
+ break;
+ case TCP_BBR_MIN_RTO:
+ BBR_OPTS_INC(tcp_bbr_min_rto);
+ bbr->r_ctl.rc_min_rto_ms = optval;
+ break;
+ case TCP_BBR_MAX_RTO:
+ BBR_OPTS_INC(tcp_bbr_max_rto);
+ bbr->rc_max_rto_sec = optval;
+ break;
+ case TCP_RACK_MIN_TO:
+ /* Minimum time between rack t-o's in ms */
+ BBR_OPTS_INC(tcp_rack_min_to);
+ bbr->r_ctl.rc_min_to = optval;
+ break;
+ case TCP_RACK_REORD_THRESH:
+ /* RACK reorder threshold (shift amount) */
+ BBR_OPTS_INC(tcp_rack_reord_thresh);
+ if ((optval > 0) && (optval < 31))
+ bbr->r_ctl.rc_reorder_shift = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_RACK_REORD_FADE:
+ /* Does reordering fade after ms time */
+ BBR_OPTS_INC(tcp_rack_reord_fade);
+ bbr->r_ctl.rc_reorder_fade = optval;
+ break;
+ case TCP_RACK_TLP_THRESH:
+ /* RACK TLP theshold i.e. srtt+(srtt/N) */
+ BBR_OPTS_INC(tcp_rack_tlp_thresh);
+ if (optval)
+ bbr->rc_tlp_threshold = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_BBR_USE_RACK_CHEAT:
+ BBR_OPTS_INC(tcp_use_rackcheat);
+ if (bbr->rc_use_google) {
+ error = EINVAL;
+ break;
+ }
+ BBR_OPTS_INC(tcp_rack_cheat);
+ if (optval)
+ bbr->bbr_use_rack_cheat = 1;
+ else
+ bbr->bbr_use_rack_cheat = 0;
+ break;
+ case TCP_BBR_FLOOR_MIN_TSO:
+ BBR_OPTS_INC(tcp_utter_max_tso);
+ if ((optval >= 0) && (optval < 40))
+ bbr->r_ctl.bbr_hptsi_segments_floor = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_BBR_UTTER_MAX_TSO:
+ BBR_OPTS_INC(tcp_utter_max_tso);
+ if ((optval >= 0) && (optval < 0xffff))
+ bbr->r_ctl.bbr_utter_max = optval;
+ else
+ error = EINVAL;
+ break;
+
+ case TCP_BBR_EXTRA_STATE:
+ BBR_OPTS_INC(tcp_extra_state);
+ if (optval)
+ bbr->rc_use_idle_restart = 1;
+ else
+ bbr->rc_use_idle_restart = 0;
+ break;
+ case TCP_BBR_SEND_IWND_IN_TSO:
+ BBR_OPTS_INC(tcp_iwnd_tso);
+ if (optval) {
+ bbr->bbr_init_win_cheat = 1;
+ if (bbr->rc_past_init_win == 0) {
+ uint32_t cts;
+ cts = tcp_get_usecs(&bbr->rc_tv);
+ tcp_bbr_tso_size_check(bbr, cts);
+ }
+ } else
+ bbr->bbr_init_win_cheat = 0;
+ break;
+ case TCP_BBR_HDWR_PACE:
+ BBR_OPTS_INC(tcp_hdwr_pacing);
+ if (optval){
+ bbr->bbr_hdw_pace_ena = 1;
+ bbr->bbr_attempt_hdwr_pace = 0;
+ } else {
+ bbr->bbr_hdw_pace_ena = 0;
+ if (bbr->bbr_hdrw_pacing) {
+ bbr->bbr_hdrw_pacing = 0;
+ in_pcbdetach_txrtlmt(bbr->rc_inp);
+ }
+ }
+ break;
+
+ case TCP_DELACK:
+ BBR_OPTS_INC(tcp_delack);
+ if (optval < 100) {
+ if (optval == 0) /* off */
+ tp->t_delayed_ack = 0;
+ else if (optval == 1) /* on which is 2 */
+ tp->t_delayed_ack = 2;
+ else /* higher than 2 and less than 100 */
+ tp->t_delayed_ack = optval;
+ if (tp->t_flags & TF_DELACK) {
+ tp->t_flags &= ~TF_DELACK;
+ tp->t_flags |= TF_ACKNOW;
+ bbr_output(tp);
+ }
+ } else
+ error = EINVAL;
+ break;
+ case TCP_RACK_PKT_DELAY:
+ /* RACK added ms i.e. rack-rtt + reord + N */
+ BBR_OPTS_INC(tcp_rack_pkt_delay);
+ bbr->r_ctl.rc_pkt_delay = optval;
+ break;
+#ifdef NETFLIX_PEAKRATE
+ case TCP_MAXPEAKRATE:
+ BBR_OPTS_INC(tcp_maxpeak);
+ error = tcp_set_maxpeakrate(tp, optval);
+ if (!error)
+ tp->t_peakrate_thr = tp->t_maxpeakrate;
+ break;
+#endif
+ case TCP_BBR_RETRAN_WTSO:
+ BBR_OPTS_INC(tcp_retran_wtso);
+ if (optval)
+ bbr->rc_resends_use_tso = 1;
+ else
+ bbr->rc_resends_use_tso = 0;
+ break;
+ case TCP_DATA_AFTER_CLOSE:
+ BBR_OPTS_INC(tcp_data_ac);
+ if (optval)
+ bbr->rc_allow_data_af_clo = 1;
+ else
+ bbr->rc_allow_data_af_clo = 0;
+ break;
+ case TCP_BBR_POLICER_DETECT:
+ BBR_OPTS_INC(tcp_policer_det);
+ if (bbr->rc_use_google == 0)
+ error = EINVAL;
+ else if (optval)
+ bbr->r_use_policer = 1;
+ else
+ bbr->r_use_policer = 0;
+ break;
+
+ case TCP_BBR_TSTMP_RAISES:
+ BBR_OPTS_INC(tcp_ts_raises);
+ if (optval)
+ bbr->ts_can_raise = 1;
+ else
+ bbr->ts_can_raise = 0;
+ break;
+ case TCP_BBR_TMR_PACE_OH:
+ BBR_OPTS_INC(tcp_pacing_oh_tmr);
+ if (bbr->rc_use_google) {
+ error = EINVAL;
+ } else {
+ if (optval)
+ bbr->r_ctl.rc_incr_tmrs = 1;
+ else
+ bbr->r_ctl.rc_incr_tmrs = 0;
+ }
+ break;
+ case TCP_BBR_PACE_OH:
+ BBR_OPTS_INC(tcp_pacing_oh);
+ if (bbr->rc_use_google) {
+ error = EINVAL;
+ } else {
+ if (optval > (BBR_INCL_TCP_OH|
+ BBR_INCL_IP_OH|
+ BBR_INCL_ENET_OH)) {
+ error = EINVAL;
+ break;
+ }
+ if (optval & BBR_INCL_TCP_OH)
+ bbr->r_ctl.rc_inc_tcp_oh = 1;
+ else
+ bbr->r_ctl.rc_inc_tcp_oh = 0;
+ if (optval & BBR_INCL_IP_OH)
+ bbr->r_ctl.rc_inc_ip_oh = 1;
+ else
+ bbr->r_ctl.rc_inc_ip_oh = 0;
+ if (optval & BBR_INCL_ENET_OH)
+ bbr->r_ctl.rc_inc_enet_oh = 1;
+ else
+ bbr->r_ctl.rc_inc_enet_oh = 0;
+ }
+ break;
+ default:
+ return (tcp_default_ctloutput(so, sopt, inp, tp));
+ break;
+ }
+#ifdef NETFLIX_STATS
+ tcp_log_socket_option(tp, sopt->sopt_name, optval, error);
+#endif
+ INP_WUNLOCK(inp);
+ return (error);
+}
+
+/*
+ * return 0 on success, error-num on failure
+ */
+static int
+bbr_get_sockopt(struct socket *so, struct sockopt *sopt,
+ struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr)
+{
+ int32_t error, optval;
+
+ /*
+ * Because all our options are either boolean or an int, we can just
+ * pull everything into optval and then unlock and copy. If we ever
+ * add a option that is not a int, then this will have quite an
+ * impact to this routine.
+ */
+ switch (sopt->sopt_name) {
+ case TCP_BBR_PACE_PER_SEC:
+ optval = bbr->r_ctl.bbr_hptsi_per_second;
+ break;
+ case TCP_BBR_PACE_DEL_TAR:
+ optval = bbr->r_ctl.bbr_hptsi_segments_delay_tar;
+ break;
+ case TCP_BBR_PACE_SEG_MAX:
+ optval = bbr->r_ctl.bbr_hptsi_segments_max;
+ break;
+ case TCP_BBR_MIN_TOPACEOUT:
+ optval = bbr->no_pacing_until;
+ break;
+ case TCP_BBR_PACE_SEG_MIN:
+ optval = bbr->r_ctl.bbr_hptsi_bytes_min;
+ break;
+ case TCP_BBR_PACE_CROSS:
+ optval = bbr->r_ctl.bbr_cross_over;
+ break;
+ case TCP_BBR_ALGORITHM:
+ optval = bbr->rc_use_google;
+ break;
+ case TCP_BBR_TSLIMITS:
+ optval = bbr->rc_use_ts_limit;
+ break;
+ case TCP_BBR_IWINTSO:
+ optval = bbr->rc_init_win;
+ break;
+ case TCP_BBR_STARTUP_PG:
+ optval = bbr->r_ctl.rc_startup_pg;
+ break;
+ case TCP_BBR_DRAIN_PG:
+ optval = bbr->r_ctl.rc_drain_pg;
+ break;
+ case TCP_BBR_PROBE_RTT_INT:
+ optval = bbr->r_ctl.rc_probertt_int;
+ break;
+ case TCP_BBR_PROBE_RTT_LEN:
+ optval = (bbr->r_ctl.rc_rttprop.cur_time_limit / USECS_IN_SECOND);
+ break;
+ case TCP_BBR_PROBE_RTT_GAIN:
+ optval = bbr->r_ctl.bbr_rttprobe_gain_val;
+ break;
+ case TCP_BBR_STARTUP_LOSS_EXIT:
+ optval = bbr->rc_loss_exit;
+ break;
+ case TCP_BBR_USEDEL_RATE:
+ error = EINVAL;
+ break;
+ case TCP_BBR_MIN_RTO:
+ optval = bbr->r_ctl.rc_min_rto_ms;
+ break;
+ case TCP_BBR_MAX_RTO:
+ optval = bbr->rc_max_rto_sec;
+ break;
+ case TCP_RACK_PACE_MAX_SEG:
+ /* Max segments in a pace */
+ optval = bbr->r_ctl.rc_pace_max_segs;
+ break;
+ case TCP_RACK_MIN_TO:
+ /* Minimum time between rack t-o's in ms */
+ optval = bbr->r_ctl.rc_min_to;
+ break;
+ case TCP_RACK_REORD_THRESH:
+ /* RACK reorder threshold (shift amount) */
+ optval = bbr->r_ctl.rc_reorder_shift;
+ break;
+ case TCP_RACK_REORD_FADE:
+ /* Does reordering fade after ms time */
+ optval = bbr->r_ctl.rc_reorder_fade;
+ break;
+ case TCP_BBR_USE_RACK_CHEAT:
+ /* Do we use the rack cheat for rxt */
+ optval = bbr->bbr_use_rack_cheat;
+ break;
+ case TCP_BBR_FLOOR_MIN_TSO:
+ optval = bbr->r_ctl.bbr_hptsi_segments_floor;
+ break;
+ case TCP_BBR_UTTER_MAX_TSO:
+ optval = bbr->r_ctl.bbr_utter_max;
+ break;
+ case TCP_BBR_SEND_IWND_IN_TSO:
+ /* Do we send TSO size segments initially */
+ optval = bbr->bbr_init_win_cheat;
+ break;
+ case TCP_BBR_EXTRA_STATE:
+ optval = bbr->rc_use_idle_restart;
+ break;
+ case TCP_RACK_TLP_THRESH:
+ /* RACK TLP theshold i.e. srtt+(srtt/N) */
+ optval = bbr->rc_tlp_threshold;
+ break;
+ case TCP_RACK_PKT_DELAY:
+ /* RACK added ms i.e. rack-rtt + reord + N */
+ optval = bbr->r_ctl.rc_pkt_delay;
+ break;
+ case TCP_BBR_RETRAN_WTSO:
+ optval = bbr->rc_resends_use_tso;
+ break;
+ case TCP_DATA_AFTER_CLOSE:
+ optval = bbr->rc_allow_data_af_clo;
+ break;
+ case TCP_DELACK:
+ optval = tp->t_delayed_ack;
+ break;
+ case TCP_BBR_HDWR_PACE:
+ optval = bbr->bbr_hdw_pace_ena;
+ break;
+ case TCP_BBR_POLICER_DETECT:
+ optval = bbr->r_use_policer;
+ break;
+ case TCP_BBR_TSTMP_RAISES:
+ optval = bbr->ts_can_raise;
+ break;
+ case TCP_BBR_TMR_PACE_OH:
+ optval = bbr->r_ctl.rc_incr_tmrs;
+ break;
+ case TCP_BBR_PACE_OH:
+ optval = 0;
+ if (bbr->r_ctl.rc_inc_tcp_oh)
+ optval |= BBR_INCL_TCP_OH;
+ if (bbr->r_ctl.rc_inc_ip_oh)
+ optval |= BBR_INCL_IP_OH;
+ if (bbr->r_ctl.rc_inc_enet_oh)
+ optval |= BBR_INCL_ENET_OH;
+ break;
+ default:
+ return (tcp_default_ctloutput(so, sopt, inp, tp));
+ break;
+ }
+ INP_WUNLOCK(inp);
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ return (error);
+}
+
+/*
+ * return 0 on success, error-num on failure
+ */
+static int
+bbr_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
+{
+ int32_t error = EINVAL;
+ struct tcp_bbr *bbr;
+
+ bbr = (struct tcp_bbr *)tp->t_fb_ptr;
+ if (bbr == NULL) {
+ /* Huh? */
+ goto out;
+ }
+ if (sopt->sopt_dir == SOPT_SET) {
+ return (bbr_set_sockopt(so, sopt, inp, tp, bbr));
+ } else if (sopt->sopt_dir == SOPT_GET) {
+ return (bbr_get_sockopt(so, sopt, inp, tp, bbr));
+ }
+out:
+ INP_WUNLOCK(inp);
+ return (error);
+}
+
+
+struct tcp_function_block __tcp_bbr = {
+ .tfb_tcp_block_name = __XSTRING(STACKNAME),
+ .tfb_tcp_output = bbr_output,
+ .tfb_do_queued_segments = ctf_do_queued_segments,
+ .tfb_do_segment_nounlock = bbr_do_segment_nounlock,
+ .tfb_tcp_do_segment = bbr_do_segment,
+ .tfb_tcp_ctloutput = bbr_ctloutput,
+ .tfb_tcp_fb_init = bbr_init,
+ .tfb_tcp_fb_fini = bbr_fini,
+ .tfb_tcp_timer_stop_all = bbr_stopall,
+ .tfb_tcp_timer_activate = bbr_timer_activate,
+ .tfb_tcp_timer_active = bbr_timer_active,
+ .tfb_tcp_timer_stop = bbr_timer_stop,
+ .tfb_tcp_rexmit_tmr = bbr_remxt_tmr,
+ .tfb_tcp_handoff_ok = bbr_handoff_ok,
+ .tfb_tcp_mtu_chg = bbr_mtu_chg
+};
+
+static const char *bbr_stack_names[] = {
+ __XSTRING(STACKNAME),
+#ifdef STACKALIAS
+ __XSTRING(STACKALIAS),
+#endif
+};
+
+static bool bbr_mod_inited = false;
+
+static int
+tcp_addbbr(module_t mod, int32_t type, void *data)
+{
+ int32_t err = 0;
+ int num_stacks;
+
+ switch (type) {
+ case MOD_LOAD:
+ printf("Attempting to load " __XSTRING(MODNAME) "\n");
+ bbr_zone = uma_zcreate(__XSTRING(MODNAME) "_map",
+ sizeof(struct bbr_sendmap),
+ NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
+ bbr_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb",
+ sizeof(struct tcp_bbr),
+ NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0);
+ sysctl_ctx_init(&bbr_sysctl_ctx);
+ bbr_sysctl_root = SYSCTL_ADD_NODE(&bbr_sysctl_ctx,
+ SYSCTL_STATIC_CHILDREN(_net_inet_tcp),
+ OID_AUTO,
+#ifdef STACKALIAS
+ __XSTRING(STACKALIAS),
+#else
+ __XSTRING(STACKNAME),
+#endif
+ CTLFLAG_RW, 0,
+ "");
+ if (bbr_sysctl_root == NULL) {
+ printf("Failed to add sysctl node\n");
+ err = EFAULT;
+ goto free_uma;
+ }
+ bbr_init_sysctls();
+ num_stacks = nitems(bbr_stack_names);
+ err = register_tcp_functions_as_names(&__tcp_bbr, M_WAITOK,
+ bbr_stack_names, &num_stacks);
+ if (err) {
+ printf("Failed to register %s stack name for "
+ "%s module\n", bbr_stack_names[num_stacks],
+ __XSTRING(MODNAME));
+ sysctl_ctx_free(&bbr_sysctl_ctx);
+ free_uma:
+ uma_zdestroy(bbr_zone);
+ uma_zdestroy(bbr_pcb_zone);
+ bbr_counter_destroy();
+ printf("Failed to register " __XSTRING(MODNAME)
+ " module err:%d\n", err);
+ return (err);
+ }
+ tcp_lro_reg_mbufq();
+ bbr_mod_inited = true;
+ printf(__XSTRING(MODNAME) " is now available\n");
+ break;
+ case MOD_QUIESCE:
+ err = deregister_tcp_functions(&__tcp_bbr, true, false);
+ break;
+ case MOD_UNLOAD:
+ err = deregister_tcp_functions(&__tcp_bbr, false, true);
+ if (err == EBUSY)
+ break;
+ if (bbr_mod_inited) {
+ uma_zdestroy(bbr_zone);
+ uma_zdestroy(bbr_pcb_zone);
+ sysctl_ctx_free(&bbr_sysctl_ctx);
+ bbr_counter_destroy();
+ printf(__XSTRING(MODNAME)
+ " is now no longer available\n");
+ bbr_mod_inited = false;
+ }
+ tcp_lro_dereg_mbufq();
+ err = 0;
+ break;
+ default:
+ return (EOPNOTSUPP);
+ }
+ return (err);
+}
+
+static moduledata_t tcp_bbr = {
+ .name = __XSTRING(MODNAME),
+ .evhand = tcp_addbbr,
+ .priv = 0
+};
+
+MODULE_VERSION(MODNAME, 1);
+DECLARE_MODULE(MODNAME, tcp_bbr, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
+MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1);
Index: head/sys/netinet/tcp_stacks/rack.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack.c
+++ head/sys/netinet/tcp_stacks/rack.c
@@ -1,6 +1,5 @@
/*-
- * Copyright (c) 2016-2019
- * Netflix Inc. All rights reserved.
+ * Copyright (c) 2016-2019 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -32,7 +31,8 @@
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_tcpdebug.h"
-
+#include "opt_ratelimit.h"
+#include "opt_kern_tls.h"
#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
@@ -45,18 +45,20 @@
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/proc.h> /* for proc0 declaration */
-#ifdef NETFLIX_STATS
-#include <sys/qmath.h>
-#endif
#include <sys/socket.h>
#include <sys/socketvar.h>
+#ifdef KERN_TLS
+#include <sys/ktls.h>
+#endif
#include <sys/sysctl.h>
#include <sys/systm.h>
-#include <sys/tree.h>
#ifdef NETFLIX_STATS
+#include <sys/qmath.h>
+#include <sys/tree.h>
#include <sys/stats.h> /* Must come after qmath.h and tree.h */
#endif
#include <sys/refcount.h>
+#include <sys/tree.h>
#include <sys/queue.h>
#include <sys/smp.h>
#include <sys/kthread.h>
@@ -79,8 +81,8 @@
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
-#define TCPOUTFLAGS
#include <netinet/tcp.h>
+#define TCPOUTFLAGS
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_log_buf.h>
#include <netinet/tcp_seq.h>
@@ -90,6 +92,7 @@
#include <netinet/tcpip.h>
#include <netinet/cc/cc.h>
#include <netinet/tcp_fastopen.h>
+#include <netinet/tcp_lro.h>
#ifdef TCPDEBUG
#include <netinet/tcp_debug.h>
#endif /* TCPDEBUG */
@@ -163,26 +166,42 @@
* must maintain the new rack scoreboard.
*
*/
-static int32_t rack_precache = 1;
static int32_t rack_tlp_thresh = 1;
static int32_t rack_reorder_thresh = 2;
static int32_t rack_reorder_fade = 60000; /* 0 - never fade, def 60,000
* - 60 seconds */
+/* Attack threshold detections */
+static uint32_t rack_highest_sack_thresh_seen = 0;
+static uint32_t rack_highest_move_thresh_seen = 0;
+
static int32_t rack_pkt_delay = 1;
-static int32_t rack_inc_var = 0;/* For TLP */
-static int32_t rack_reduce_largest_on_idle = 0;
static int32_t rack_min_pace_time = 0;
-static int32_t rack_min_pace_time_seg_req=6;
static int32_t rack_early_recovery = 1;
-static int32_t rack_early_recovery_max_seg = 6;
static int32_t rack_send_a_lot_in_prr = 1;
static int32_t rack_min_to = 1; /* Number of ms minimum timeout */
-static int32_t rack_tlp_in_recovery = 1; /* Can we do TLP in recovery? */
static int32_t rack_verbose_logging = 0;
static int32_t rack_ignore_data_after_close = 1;
-static int32_t rack_map_entries_limit = 1024;
-static int32_t rack_map_split_limit = 256;
+static int32_t use_rack_cheat = 1;
+static int32_t rack_persist_min = 250; /* 250ms */
+static int32_t rack_persist_max = 1000; /* 1 Second */
+static int32_t rack_sack_not_required = 0; /* set to one to allow non-sack to use rack */
+static int32_t rack_hw_tls_max_seg = 0; /* 0 means use hw-tls single segment */
+/* Sack attack detection thresholds and such */
+static int32_t tcp_force_detection = 0;
+
+#ifdef NETFLIX_EXP_DETECTION
+static int32_t tcp_sack_to_ack_thresh = 700; /* 70 % */
+static int32_t tcp_sack_to_move_thresh = 600; /* 60 % */
+static int32_t tcp_restoral_thresh = 650; /* 65 % (sack:2:ack -5%) */
+static int32_t tcp_attack_on_turns_on_logging = 0;
+static int32_t tcp_map_minimum = 500;
+#endif
+static int32_t tcp_sad_decay_val = 800;
+static int32_t tcp_sad_pacing_interval = 2000;
+static int32_t tcp_sad_low_pps = 100;
+
+
/*
* Currently regular tcp has a rto_min of 30ms
* the backoff goes 12 times so that ends up
@@ -191,11 +210,11 @@
*/
static int32_t rack_tlp_min = 10;
static int32_t rack_rto_min = 30; /* 30ms same as main freebsd */
-static int32_t rack_rto_max = 30000; /* 30 seconds */
+static int32_t rack_rto_max = 4000; /* 4 seconds */
static const int32_t rack_free_cache = 2;
static int32_t rack_hptsi_segments = 40;
static int32_t rack_rate_sample_method = USE_RTT_LOW;
-static int32_t rack_pace_every_seg = 1;
+static int32_t rack_pace_every_seg = 0;
static int32_t rack_delayed_ack_time = 200; /* 200ms */
static int32_t rack_slot_reduction = 4;
static int32_t rack_lower_cwnd_at_tlp = 0;
@@ -204,10 +223,13 @@
static int32_t rack_tlp_max_resend = 2;
static int32_t rack_limited_retran = 0;
static int32_t rack_always_send_oldest = 0;
-static int32_t rack_sack_block_limit = 128;
static int32_t rack_use_sack_filter = 1;
static int32_t rack_tlp_threshold_use = TLP_USE_TWO_ONE;
+static int32_t rack_per_of_gp = 50;
+static int32_t rack_tcp_map_entries_limit = 1500;
+static int32_t rack_tcp_map_split_limit = 256;
+
/* Rack specific counters */
counter_u64_t rack_badfr;
counter_u64_t rack_badfr_bytes;
@@ -217,8 +239,11 @@
counter_u64_t rack_reorder_seen;
counter_u64_t rack_paced_segments;
counter_u64_t rack_unpaced_segments;
+counter_u64_t rack_calc_zero;
+counter_u64_t rack_calc_nonzero;
counter_u64_t rack_saw_enobuf;
counter_u64_t rack_saw_enetunreach;
+counter_u64_t rack_per_timer_hole;
/* Tail loss probe counters */
counter_u64_t rack_tlp_tot;
@@ -239,13 +264,34 @@
counter_u64_t rack_sack_proc_all;
counter_u64_t rack_sack_proc_short;
counter_u64_t rack_sack_proc_restart;
-counter_u64_t rack_runt_sacks;
+counter_u64_t rack_sack_attacks_detected;
+counter_u64_t rack_sack_attacks_reversed;
+counter_u64_t rack_sack_used_next_merge;
+counter_u64_t rack_sack_splits;
+counter_u64_t rack_sack_used_prev_merge;
+counter_u64_t rack_sack_skipped_acked;
+counter_u64_t rack_ack_total;
+counter_u64_t rack_express_sack;
+counter_u64_t rack_sack_total;
+counter_u64_t rack_move_none;
+counter_u64_t rack_move_some;
+
counter_u64_t rack_used_tlpmethod;
counter_u64_t rack_used_tlpmethod2;
counter_u64_t rack_enter_tlp_calc;
counter_u64_t rack_input_idle_reduces;
+counter_u64_t rack_collapsed_win;
counter_u64_t rack_tlp_does_nada;
+/* Counters for HW TLS */
+counter_u64_t rack_tls_rwnd;
+counter_u64_t rack_tls_cwnd;
+counter_u64_t rack_tls_app;
+counter_u64_t rack_tls_other;
+counter_u64_t rack_tls_filled;
+counter_u64_t rack_tls_rxt;
+counter_u64_t rack_tls_tlp;
+
/* Temp CPU counters */
counter_u64_t rack_find_high;
@@ -253,21 +299,12 @@
counter_u64_t rack_out_size[TCP_MSS_ACCT_SIZE];
counter_u64_t rack_opts_arry[RACK_OPTS_SIZE];
-/*
- * This was originally defined in tcp_timer.c, but is now reproduced here given
- * the unification of the SYN and non-SYN retransmit timer exponents combined
- * with wanting to retain previous behaviour for previously deployed stack
- * versions.
- */
-int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
- { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
-
static void
rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, int event, int line);
static int
rack_process_ack(struct mbuf *m, struct tcphdr *th,
- struct socket *so, struct tcpcb *tp, struct tcpopt *to,
+ struct socket *so, struct tcpcb *tp, struct tcpopt *to,
uint32_t tiwin, int32_t tlen, int32_t * ofia, int32_t thflags, int32_t * ret_val);
static int
rack_process_data(struct mbuf *m, struct tcphdr *th,
@@ -320,17 +357,13 @@
static void
rack_log_sack_passed(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm);
-static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num);
+static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num, int num);
static int32_t rack_output(struct tcpcb *tp);
-static void
-rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th,
- struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
- uint8_t iptos, int32_t nxt_pkt, struct timeval *tv);
static uint32_t
rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack,
struct sackblk *sack, struct tcpopt *to, struct rack_sendmap **prsm,
- uint32_t cts);
+ uint32_t cts, int *moved_two);
static void rack_post_recovery(struct tcpcb *tp, struct tcphdr *th);
static void rack_remxt_tmr(struct tcpcb *tp);
static int
@@ -354,9 +387,6 @@
rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type);
static int32_t tcp_addrack(module_t mod, int32_t type, void *data);
-static void
-rack_challenge_ack(struct mbuf *m, struct tcphdr *th,
- struct tcpcb *tp, int32_t * ret_val);
static int
rack_do_close_wait(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
@@ -365,13 +395,6 @@
rack_do_closing(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt);
-static void rack_do_drop(struct mbuf *m, struct tcpcb *tp);
-static void
-rack_do_dropafterack(struct mbuf *m, struct tcpcb *tp,
- struct tcphdr *th, int32_t thflags, int32_t tlen, int32_t * ret_val);
-static void
-rack_do_dropwithreset(struct mbuf *m, struct tcpcb *tp,
- struct tcphdr *th, int32_t rstreason, int32_t tlen);
static int
rack_do_established(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
@@ -400,13 +423,6 @@
rack_do_syn_sent(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt);
-static int
-rack_drop_checks(struct tcpopt *to, struct mbuf *m,
- struct tcphdr *th, struct tcpcb *tp, int32_t * tlenp, int32_t * thf,
- int32_t * drop_hdrlen, int32_t * ret_val);
-static int
-rack_process_rst(struct mbuf *m, struct tcphdr *th,
- struct socket *so, struct tcpcb *tp);
struct rack_sendmap *
tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack,
uint32_t tsused);
@@ -414,10 +430,6 @@
static void
tcp_rack_partialack(struct tcpcb *tp, struct tcphdr *th);
-static int
-rack_ts_check(struct mbuf *m, struct tcphdr *th,
- struct tcpcb *tp, int32_t tlen, int32_t thflags, int32_t * ret_val);
-
int32_t rack_clear_counter=0;
@@ -453,9 +465,12 @@
counter_u64_zero(rack_to_arm_rack);
counter_u64_zero(rack_to_arm_tlp);
counter_u64_zero(rack_paced_segments);
+ counter_u64_zero(rack_calc_zero);
+ counter_u64_zero(rack_calc_nonzero);
counter_u64_zero(rack_unpaced_segments);
counter_u64_zero(rack_saw_enobuf);
counter_u64_zero(rack_saw_enetunreach);
+ counter_u64_zero(rack_per_timer_hole);
counter_u64_zero(rack_to_alloc_hard);
counter_u64_zero(rack_to_alloc_emerg);
counter_u64_zero(rack_sack_proc_all);
@@ -466,12 +481,31 @@
counter_u64_zero(rack_alloc_limited_conns);
counter_u64_zero(rack_split_limited);
counter_u64_zero(rack_find_high);
- counter_u64_zero(rack_runt_sacks);
+ counter_u64_zero(rack_tls_rwnd);
+ counter_u64_zero(rack_tls_cwnd);
+ counter_u64_zero(rack_tls_app);
+ counter_u64_zero(rack_tls_other);
+ counter_u64_zero(rack_tls_filled);
+ counter_u64_zero(rack_tls_rxt);
+ counter_u64_zero(rack_tls_tlp);
+ counter_u64_zero(rack_sack_attacks_detected);
+ counter_u64_zero(rack_sack_attacks_reversed);
+ counter_u64_zero(rack_sack_used_next_merge);
+ counter_u64_zero(rack_sack_used_prev_merge);
+ counter_u64_zero(rack_sack_splits);
+ counter_u64_zero(rack_sack_skipped_acked);
+ counter_u64_zero(rack_ack_total);
+ counter_u64_zero(rack_express_sack);
+ counter_u64_zero(rack_sack_total);
+ counter_u64_zero(rack_move_none);
+ counter_u64_zero(rack_move_some);
counter_u64_zero(rack_used_tlpmethod);
counter_u64_zero(rack_used_tlpmethod2);
counter_u64_zero(rack_enter_tlp_calc);
counter_u64_zero(rack_progress_drops);
counter_u64_zero(rack_tlp_does_nada);
+ counter_u64_zero(rack_collapsed_win);
+
}
rack_clear_counter = 0;
return (0);
@@ -482,50 +516,62 @@
static void
rack_init_sysctls()
{
+ struct sysctl_oid *rack_counters;
+ struct sysctl_oid *rack_attack;
+
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "map_limit", CTLFLAG_RW,
- &rack_map_entries_limit , 1024,
- "Is there a limit on how big the sendmap can grow? ");
-
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "map_splitlimit", CTLFLAG_RW,
- &rack_map_split_limit , 256,
- "Is there a limit on how much splitting a peer can do?");
-
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "rate_sample_method", CTLFLAG_RW,
&rack_rate_sample_method , USE_RTT_LOW,
"What method should we use for rate sampling 0=high, 1=low ");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO, "hw_tlsmax", CTLFLAG_RW,
+ &rack_hw_tls_max_seg , 0,
+ "Do we have a multplier of TLS records we can send as a max (0=1 TLS record)? ");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "data_after_close", CTLFLAG_RW,
&rack_ignore_data_after_close, 0,
"Do we hold off sending a RST until all pending data is ack'd");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO, "cheat_rxt", CTLFLAG_RW,
+ &use_rack_cheat, 1,
+ "Do we use the rxt cheat for rack?");
+
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO, "persmin", CTLFLAG_RW,
+ &rack_persist_min, 250,
+ "What is the minimum time in milliseconds between persists");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO, "persmax", CTLFLAG_RW,
+ &rack_persist_max, 1000,
+ "What is the largest delay in milliseconds between persists");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO, "no_sack_needed", CTLFLAG_RW,
+ &rack_sack_not_required, 0,
+ "Do we allow rack to run on connections not supporting SACK?");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "tlpmethod", CTLFLAG_RW,
&rack_tlp_threshold_use, TLP_USE_TWO_ONE,
"What method do we do for TLP time calc 0=no-de-ack-comp, 1=ID, 2=2.1, 3=2.2");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO, "gp_percentage", CTLFLAG_RW,
+ &rack_per_of_gp, 50,
+ "Do we pace to percentage of goodput (0=old method)?");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "min_pace_time", CTLFLAG_RW,
&rack_min_pace_time, 0,
"Should we enforce a minimum pace time of 1ms");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "min_pace_segs", CTLFLAG_RW,
- &rack_min_pace_time_seg_req, 6,
- "How many segments have to be in the len to enforce min-pace-time");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "idle_reduce_high", CTLFLAG_RW,
- &rack_reduce_largest_on_idle, 0,
- "Should we reduce the largest cwnd seen to IW on idle reduction");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "bb_verbose", CTLFLAG_RW,
&rack_verbose_logging, 0,
"Should RACK black box logging be verbose");
@@ -546,26 +592,11 @@
"TLP minimum timeout per the specification (10ms)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "precache", CTLFLAG_RW,
- &rack_precache, 0,
- "Where should we precache the mcopy (0 is not at all)");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "sblklimit", CTLFLAG_RW,
- &rack_sack_block_limit, 128,
- "When do we start paying attention to small sack blocks");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "send_oldest", CTLFLAG_RW,
&rack_always_send_oldest, 1,
"Should we always send the oldest TLP and RACK-TLP");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "rack_tlp_in_recovery", CTLFLAG_RW,
- &rack_tlp_in_recovery, 1,
- "Can we do a TLP during recovery?");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "rack_tlimit", CTLFLAG_RW,
&rack_limited_retran, 0,
"How many times can a rack timeout drive out sends");
@@ -607,12 +638,12 @@
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "hptsi_every_seg", CTLFLAG_RW,
- &rack_pace_every_seg, 1,
- "Should we pace out every segment hptsi");
+ &rack_pace_every_seg, 0,
+ "Should we use the original pacing mechanism that did not pace much?");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "hptsi_seg_max", CTLFLAG_RW,
- &rack_hptsi_segments, 6,
+ &rack_hptsi_segments, 40,
"Should we pace out only a limited size of segments");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
@@ -626,11 +657,6 @@
"Minimum rack timeout in milliseconds");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "earlyrecoveryseg", CTLFLAG_RW,
- &rack_early_recovery_max_seg, 6,
- "Max segments in early recovery");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "earlyrecovery", CTLFLAG_RW,
&rack_early_recovery, 1,
"Do we do early recovery with rack");
@@ -654,221 +680,376 @@
OID_AUTO, "pktdelay", CTLFLAG_RW,
&rack_pkt_delay, 1,
"Extra RACK time (in ms) besides reordering thresh");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
+
+ rack_counters = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "inc_var", CTLFLAG_RW,
- &rack_inc_var, 0,
- "Should rack add to the TLP timer the variance in rtt calculation");
+ OID_AUTO,
+ "stats",
+ CTLFLAG_RW, 0,
+ "Rack Counters");
rack_badfr = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "badfr", CTLFLAG_RD,
&rack_badfr, "Total number of bad FRs");
rack_badfr_bytes = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "badfr_bytes", CTLFLAG_RD,
&rack_badfr_bytes, "Total number of bad FRs");
rack_rtm_prr_retran = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "prrsndret", CTLFLAG_RD,
&rack_rtm_prr_retran,
"Total number of prr based retransmits");
rack_rtm_prr_newdata = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "prrsndnew", CTLFLAG_RD,
&rack_rtm_prr_newdata,
"Total number of prr based new transmits");
rack_timestamp_mismatch = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tsnf", CTLFLAG_RD,
&rack_timestamp_mismatch,
"Total number of timestamps that we could not find the reported ts");
rack_find_high = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "findhigh", CTLFLAG_RD,
&rack_find_high,
"Total number of FIN causing find-high");
rack_reorder_seen = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "reordering", CTLFLAG_RD,
&rack_reorder_seen,
"Total number of times we added delay due to reordering");
rack_tlp_tot = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_to_total", CTLFLAG_RD,
&rack_tlp_tot,
"Total number of tail loss probe expirations");
rack_tlp_newdata = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_new", CTLFLAG_RD,
&rack_tlp_newdata,
"Total number of tail loss probe sending new data");
rack_tlp_retran = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_retran", CTLFLAG_RD,
&rack_tlp_retran,
"Total number of tail loss probe sending retransmitted data");
rack_tlp_retran_bytes = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_retran_bytes", CTLFLAG_RD,
&rack_tlp_retran_bytes,
"Total bytes of tail loss probe sending retransmitted data");
rack_tlp_retran_fail = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_retran_fail", CTLFLAG_RD,
&rack_tlp_retran_fail,
"Total number of tail loss probe sending retransmitted data that failed (wait for t3)");
rack_to_tot = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "rack_to_tot", CTLFLAG_RD,
&rack_to_tot,
"Total number of times the rack to expired?");
rack_to_arm_rack = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "arm_rack", CTLFLAG_RD,
&rack_to_arm_rack,
"Total number of times the rack timer armed?");
rack_to_arm_tlp = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "arm_tlp", CTLFLAG_RD,
&rack_to_arm_tlp,
"Total number of times the tlp timer armed?");
+
+ rack_calc_zero = counter_u64_alloc(M_WAITOK);
+ rack_calc_nonzero = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "calc_zero", CTLFLAG_RD,
+ &rack_calc_zero,
+ "Total number of times pacing time worked out to zero?");
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "calc_nonzero", CTLFLAG_RD,
+ &rack_calc_nonzero,
+ "Total number of times pacing time worked out to non-zero?");
rack_paced_segments = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "paced", CTLFLAG_RD,
&rack_paced_segments,
"Total number of times a segment send caused hptsi");
rack_unpaced_segments = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "unpaced", CTLFLAG_RD,
&rack_unpaced_segments,
"Total number of times a segment did not cause hptsi");
rack_saw_enobuf = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "saw_enobufs", CTLFLAG_RD,
&rack_saw_enobuf,
"Total number of times a segment did not cause hptsi");
rack_saw_enetunreach = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "saw_enetunreach", CTLFLAG_RD,
&rack_saw_enetunreach,
"Total number of times a segment did not cause hptsi");
rack_to_alloc = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "allocs", CTLFLAG_RD,
&rack_to_alloc,
"Total allocations of tracking structures");
rack_to_alloc_hard = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "allochard", CTLFLAG_RD,
&rack_to_alloc_hard,
"Total allocations done with sleeping the hard way");
rack_to_alloc_emerg = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "allocemerg", CTLFLAG_RD,
&rack_to_alloc_emerg,
"Total allocations done from emergency cache");
rack_to_alloc_limited = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "alloc_limited", CTLFLAG_RD,
&rack_to_alloc_limited,
"Total allocations dropped due to limit");
rack_alloc_limited_conns = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "alloc_limited_conns", CTLFLAG_RD,
&rack_alloc_limited_conns,
"Connections with allocations dropped due to limit");
rack_split_limited = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "split_limited", CTLFLAG_RD,
&rack_split_limited,
"Split allocations dropped due to limit");
rack_sack_proc_all = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "sack_long", CTLFLAG_RD,
&rack_sack_proc_all,
"Total times we had to walk whole list for sack processing");
rack_sack_proc_restart = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "sack_restart", CTLFLAG_RD,
&rack_sack_proc_restart,
"Total times we had to walk whole list due to a restart");
rack_sack_proc_short = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "sack_short", CTLFLAG_RD,
&rack_sack_proc_short,
"Total times we took shortcut for sack processing");
rack_enter_tlp_calc = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_calc_entered", CTLFLAG_RD,
&rack_enter_tlp_calc,
"Total times we called calc-tlp");
rack_used_tlpmethod = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "hit_tlp_method", CTLFLAG_RD,
&rack_used_tlpmethod,
"Total number of runt sacks");
rack_used_tlpmethod2 = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "hit_tlp_method2", CTLFLAG_RD,
&rack_used_tlpmethod2,
- "Total number of runt sacks 2");
- rack_runt_sacks = counter_u64_alloc(M_WAITOK);
- SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ "Total number of times we hit TLP method 2");
+ /* Sack Attacker detection stuff */
+ rack_attack = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "runtsacks", CTLFLAG_RD,
- &rack_runt_sacks,
- "Total number of runt sacks");
+ OID_AUTO,
+ "sack_attack",
+ CTLFLAG_RW, 0,
+ "Rack Sack Attack Counters and Controls");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "detect_highsackratio", CTLFLAG_RW,
+ &rack_highest_sack_thresh_seen, 0,
+ "Highest sack to ack ratio seen");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "detect_highmoveratio", CTLFLAG_RW,
+ &rack_highest_move_thresh_seen, 0,
+ "Highest move to non-move ratio seen");
+ rack_ack_total = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "acktotal", CTLFLAG_RD,
+ &rack_ack_total,
+ "Total number of Ack's");
+
+ rack_express_sack = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "exp_sacktotal", CTLFLAG_RD,
+ &rack_express_sack,
+ "Total expresss number of Sack's");
+ rack_sack_total = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "sacktotal", CTLFLAG_RD,
+ &rack_sack_total,
+ "Total number of SACK's");
+ rack_move_none = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "move_none", CTLFLAG_RD,
+ &rack_move_none,
+ "Total number of SACK index reuse of postions under threshold");
+ rack_move_some = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "move_some", CTLFLAG_RD,
+ &rack_move_some,
+ "Total number of SACK index reuse of postions over threshold");
+ rack_sack_attacks_detected = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "attacks", CTLFLAG_RD,
+ &rack_sack_attacks_detected,
+ "Total number of SACK attackers that had sack disabled");
+ rack_sack_attacks_reversed = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "reversed", CTLFLAG_RD,
+ &rack_sack_attacks_reversed,
+ "Total number of SACK attackers that were later determined false positive");
+ rack_sack_used_next_merge = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "nextmerge", CTLFLAG_RD,
+ &rack_sack_used_next_merge,
+ "Total number of times we used the next merge");
+ rack_sack_used_prev_merge = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "prevmerge", CTLFLAG_RD,
+ &rack_sack_used_prev_merge,
+ "Total number of times we used the prev merge");
+ rack_sack_skipped_acked = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "skipacked", CTLFLAG_RD,
+ &rack_sack_skipped_acked,
+ "Total number of times we skipped previously sacked");
+ rack_sack_splits = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_attack),
+ OID_AUTO, "ofsplit", CTLFLAG_RD,
+ &rack_sack_splits,
+ "Total number of times we did the old fashion tree split");
rack_progress_drops = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "prog_drops", CTLFLAG_RD,
&rack_progress_drops,
"Total number of progress drops");
rack_input_idle_reduces = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "idle_reduce_oninput", CTLFLAG_RD,
&rack_input_idle_reduces,
"Total number of idle reductions on input");
+ rack_collapsed_win = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "collapsed_win", CTLFLAG_RD,
+ &rack_collapsed_win,
+ "Total number of collapsed windows");
rack_tlp_does_nada = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "tlp_nada", CTLFLAG_RD,
&rack_tlp_does_nada,
"Total number of nada tlp calls");
+
+ rack_tls_rwnd = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_rwnd", CTLFLAG_RD,
+ &rack_tls_rwnd,
+ "Total hdwr tls rwnd limited");
+
+ rack_tls_cwnd = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_cwnd", CTLFLAG_RD,
+ &rack_tls_cwnd,
+ "Total hdwr tls cwnd limited");
+
+ rack_tls_app = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_app", CTLFLAG_RD,
+ &rack_tls_app,
+ "Total hdwr tls app limited");
+
+ rack_tls_other = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_other", CTLFLAG_RD,
+ &rack_tls_other,
+ "Total hdwr tls other limited");
+
+ rack_tls_filled = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_filled", CTLFLAG_RD,
+ &rack_tls_filled,
+ "Total hdwr tls filled");
+
+ rack_tls_rxt = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_rxt", CTLFLAG_RD,
+ &rack_tls_rxt,
+ "Total hdwr rxt");
+
+ rack_tls_tlp = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tls_tlp", CTLFLAG_RD,
+ &rack_tls_tlp,
+ "Total hdwr tls tlp");
+ rack_per_timer_hole = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "timer_hole", CTLFLAG_RD,
+ &rack_per_timer_hole,
+ "Total persists start in timer hole");
+
COUNTER_ARRAY_ALLOC(rack_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK);
SYSCTL_ADD_COUNTER_U64_ARRAY(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "outsize", CTLFLAG_RD,
@@ -883,10 +1064,52 @@
&rack_clear_counter, 0, sysctl_rack_clear, "IU", "Clear counters");
}
+static __inline int
+rb_map_cmp(struct rack_sendmap *b, struct rack_sendmap *a)
+{
+ if (SEQ_GEQ(b->r_start, a->r_start) &&
+ SEQ_LT(b->r_start, a->r_end)) {
+ /*
+ * The entry b is within the
+ * block a. i.e.:
+ * a -- |-------------|
+ * b -- |----|
+ * <or>
+ * b -- |------|
+ * <or>
+ * b -- |-----------|
+ */
+ return (0);
+ } else if (SEQ_GEQ(b->r_start, a->r_end)) {
+ /*
+ * b falls as either the next
+ * sequence block after a so a
+ * is said to be smaller than b.
+ * i.e:
+ * a -- |------|
+ * b -- |--------|
+ * or
+ * b -- |-----|
+ */
+ return (1);
+ }
+ /*
+ * Whats left is where a is
+ * larger than b. i.e:
+ * a -- |-------|
+ * b -- |---|
+ * or even possibly
+ * b -- |--------------|
+ */
+ return (-1);
+}
+
+RB_PROTOTYPE(rack_rb_tree_head, rack_sendmap, r_next, rb_map_cmp);
+RB_GENERATE(rack_rb_tree_head, rack_sendmap, r_next, rb_map_cmp);
+
static inline int32_t
rack_progress_timeout_check(struct tcpcb *tp)
{
-#ifdef NETFLIX_PROGRESS
if (tp->t_maxunacktime && tp->t_acktime && TSTMP_GT(ticks, tp->t_acktime)) {
if ((ticks - tp->t_acktime) >= tp->t_maxunacktime) {
/*
@@ -897,21 +1120,52 @@
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
counter_u64_add(rack_progress_drops, 1);
+#ifdef NETFLIX_STATS
TCPSTAT_INC(tcps_progdrops);
+#endif
rack_log_progress_event(rack, tp, ticks, PROGRESS_DROP, __LINE__);
return (1);
}
}
-#endif
return (0);
}
+
static void
+rack_log_retran_reason(struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t tsused, uint32_t thresh, int mod)
+{
+ if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+ memset(&log.u_bbr, 0, sizeof(log.u_bbr));
+ log.u_bbr.flex1 = tsused;
+ log.u_bbr.flex2 = thresh;
+ log.u_bbr.flex3 = rsm->r_flags;
+ log.u_bbr.flex4 = rsm->r_dupack;
+ log.u_bbr.flex5 = rsm->r_start;
+ log.u_bbr.flex6 = rsm->r_end;
+ log.u_bbr.flex8 = mod;
+ log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
+ log.u_bbr.ininput = rack->rc_inp->inp_in_input;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ BBR_LOG_SETTINGS_CHG, 0,
+ 0, &log, false, &tv);
+ }
+}
+
+
+
+static void
rack_log_to_start(struct tcp_rack *rack, uint32_t cts, uint32_t to, int32_t slot, uint8_t which)
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.flex1 = TICKS_2_MSEC(rack->rc_tp->t_srtt >> TCP_RTT_SHIFT);
@@ -920,22 +1174,27 @@
log.u_bbr.flex4 = slot;
log.u_bbr.flex5 = rack->rc_inp->inp_hptsslot;
log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
+ log.u_bbr.flex7 = rack->rc_in_persist;
log.u_bbr.flex8 = which;
+ log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
log.u_bbr.ininput = rack->rc_inp->inp_in_input;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TIMERSTAR, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
static void
-rack_log_to_event(struct tcp_rack *rack, int32_t to_num)
+rack_log_to_event(struct tcp_rack *rack, int32_t to_num, int no)
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
@@ -943,11 +1202,15 @@
log.u_bbr.flex8 = to_num;
log.u_bbr.flex1 = rack->r_ctl.rc_rack_min_rtt;
log.u_bbr.flex2 = rack->rc_rack_rtt;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.flex3 = no;
+ log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_RTO, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
@@ -957,6 +1220,7 @@
{
if (tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
@@ -969,11 +1233,14 @@
log.u_bbr.flex6 = rack->r_ctl.rack_rs.rs_rtt_cnt;
log.u_bbr.rttProp = rack->r_ctl.rack_rs.rs_rtt_tot;
log.u_bbr.flex8 = rack->r_ctl.rc_rate_sample_method;
- TCP_LOG_EVENT(tp, NULL,
+ log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_BBRRTT, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
@@ -989,10 +1256,16 @@
union tcp_log_stackspecific log;
struct timeval tv;
- memset(&log, 0, sizeof(log));
/* Convert our ms to a microsecond */
+ memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = rtt * 1000;
+ log.u_bbr.flex2 = rack->r_ctl.ack_count;
+ log.u_bbr.flex3 = rack->r_ctl.sack_count;
+ log.u_bbr.flex4 = rack->r_ctl.sack_noextra_move;
+ log.u_bbr.flex5 = rack->r_ctl.sack_moved_extra;
+ log.u_bbr.flex8 = rack->sack_attack_disable;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
@@ -1007,6 +1280,7 @@
{
if (rack_verbose_logging && (tp->t_logstate != TCP_LOG_STATE_OFF)) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
@@ -1016,11 +1290,13 @@
log.u_bbr.flex3 = tp->t_maxunacktime;
log.u_bbr.flex4 = tp->t_acktime;
log.u_bbr.flex8 = event;
- TCP_LOG_EVENT(tp, NULL,
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_PROGRESS, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
@@ -1029,18 +1305,22 @@
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
log.u_bbr.ininput = rack->rc_inp->inp_in_input;
log.u_bbr.flex1 = slot;
+ log.u_bbr.flex2 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex7 = (0x0000ffff & rack->r_ctl.rc_hpts_flags);
log.u_bbr.flex8 = rack->rc_in_persist;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_BBRSND, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
@@ -1049,41 +1329,76 @@
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log, 0, sizeof(log));
log.u_bbr.flex1 = did_out;
log.u_bbr.flex2 = nxt_pkt;
log.u_bbr.flex3 = way_out;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
+ log.u_bbr.applimited = rack->r_ctl.rc_pace_min_segs;
log.u_bbr.flex7 = rack->r_wanted_output;
log.u_bbr.flex8 = rack->rc_in_persist;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_DOSEG_DONE, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
+static void
+rack_log_type_hrdwtso(struct tcpcb *tp, struct tcp_rack *rack, int len, int mod, int32_t orig_len, int frm)
+{
+ if (tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+ uint32_t cts;
+ memset(&log, 0, sizeof(log));
+ cts = tcp_get_usecs(&tv);
+ log.u_bbr.flex1 = rack->r_ctl.rc_pace_min_segs;
+ log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex4 = len;
+ log.u_bbr.flex5 = orig_len;
+ log.u_bbr.flex6 = rack->r_ctl.rc_sacked;
+ log.u_bbr.flex7 = mod;
+ log.u_bbr.flex8 = frm;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(tp, NULL,
+ &tp->t_inpcb->inp_socket->so_rcv,
+ &tp->t_inpcb->inp_socket->so_snd,
+ TCP_HDWR_TLS, 0,
+ 0, &log, false, &tv);
+ }
+}
+
static void
rack_log_type_just_return(struct tcp_rack *rack, uint32_t cts, uint32_t tlen, uint32_t slot, uint8_t hpts_calling)
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
log.u_bbr.ininput = rack->rc_inp->inp_in_input;
log.u_bbr.flex1 = slot;
log.u_bbr.flex2 = rack->r_ctl.rc_hpts_flags;
+ log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex7 = hpts_calling;
log.u_bbr.flex8 = rack->rc_in_persist;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_JUSTRET, 0,
- tlen, &log, false);
+ tlen, &log, false, &tv);
}
}
@@ -1092,6 +1407,7 @@
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
@@ -1100,13 +1416,16 @@
log.u_bbr.flex2 = 0;
log.u_bbr.flex3 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex4 = 0;
+ log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
log.u_bbr.flex8 = hpts_removed;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TIMERCANC, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
@@ -1115,6 +1434,7 @@
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.flex1 = timers;
@@ -1122,15 +1442,76 @@
log.u_bbr.flex3 = rack->r_ctl.rc_timer_exp;
log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex5 = cts;
- TCP_LOG_EVENT(rack->rc_tp, NULL,
+ log.u_bbr.flex6 = rack->r_ctl.rc_prr_sndcnt;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
BBR_LOG_TO_PROCESS, 0,
- 0, &log, false);
+ 0, &log, false, &tv);
}
}
static void
+rack_log_to_prr(struct tcp_rack *rack, int frm)
+{
+ if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+
+ memset(&log.u_bbr, 0, sizeof(log.u_bbr));
+ log.u_bbr.flex1 = rack->r_ctl.rc_prr_out;
+ log.u_bbr.flex2 = rack->r_ctl.rc_prr_recovery_fs;
+ log.u_bbr.flex3 = rack->r_ctl.rc_prr_sndcnt;
+ log.u_bbr.flex4 = rack->r_ctl.rc_prr_delivered;
+ log.u_bbr.flex5 = rack->r_ctl.rc_sacked;
+ log.u_bbr.flex6 = rack->r_ctl.rc_holes_rxt;
+ log.u_bbr.flex8 = frm;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ BBR_LOG_BBRUPD, 0,
+ 0, &log, false, &tv);
+ }
+}
+
+#ifdef NETFLIX_EXP_DETECTION
+static void
+rack_log_sad(struct tcp_rack *rack, int event)
+{
+ if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+
+ memset(&log.u_bbr, 0, sizeof(log.u_bbr));
+ log.u_bbr.flex1 = rack->r_ctl.sack_count;
+ log.u_bbr.flex2 = rack->r_ctl.ack_count;
+ log.u_bbr.flex3 = rack->r_ctl.sack_moved_extra;
+ log.u_bbr.flex4 = rack->r_ctl.sack_noextra_move;
+ log.u_bbr.flex5 = rack->r_ctl.rc_num_maps_alloced;
+ log.u_bbr.flex6 = tcp_sack_to_ack_thresh;
+ log.u_bbr.pkts_out = tcp_sack_to_move_thresh;
+ log.u_bbr.lt_epoch = (tcp_force_detection << 8);
+ log.u_bbr.lt_epoch |= rack->do_detection;
+ log.u_bbr.applimited = tcp_map_minimum;
+ log.u_bbr.flex7 = rack->sack_attack_disable;
+ log.u_bbr.flex8 = event;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ log.u_bbr.delivered = tcp_sad_decay_val;
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ TCP_SAD_DETECTION, 0,
+ 0, &log, false, &tv);
+ }
+}
+#endif
+
+static void
rack_counter_destroy()
{
counter_u64_free(rack_badfr);
@@ -1158,14 +1539,15 @@
counter_u64_free(rack_sack_proc_restart);
counter_u64_free(rack_to_alloc);
counter_u64_free(rack_to_alloc_limited);
+ counter_u64_free(rack_alloc_limited_conns);
counter_u64_free(rack_split_limited);
counter_u64_free(rack_find_high);
- counter_u64_free(rack_runt_sacks);
counter_u64_free(rack_enter_tlp_calc);
counter_u64_free(rack_used_tlpmethod);
counter_u64_free(rack_used_tlpmethod2);
counter_u64_free(rack_progress_drops);
counter_u64_free(rack_input_idle_reduces);
+ counter_u64_free(rack_collapsed_win);
counter_u64_free(rack_tlp_does_nada);
COUNTER_ARRAY_FREE(rack_out_size, TCP_MSS_ACCT_SIZE);
COUNTER_ARRAY_FREE(rack_opts_arry, RACK_OPTS_SIZE);
@@ -1185,7 +1567,7 @@
if (rack->rc_free_cnt) {
counter_u64_add(rack_to_alloc_emerg, 1);
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
- TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_next);
+ TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->rc_free_cnt--;
return (rsm);
}
@@ -1195,8 +1577,9 @@
static struct rack_sendmap *
rack_alloc_full_limit(struct tcp_rack *rack)
{
- if ((rack_map_entries_limit > 0) &&
- (rack->r_ctl.rc_num_maps_alloced >= rack_map_entries_limit)) {
+ if ((rack_tcp_map_entries_limit > 0) &&
+ (rack->do_detection == 0) &&
+ (rack->r_ctl.rc_num_maps_alloced >= rack_tcp_map_entries_limit)) {
counter_u64_add(rack_to_alloc_limited, 1);
if (!rack->alloc_limit_reported) {
rack->alloc_limit_reported = 1;
@@ -1215,8 +1598,9 @@
if (limit_type) {
/* currently there is only one limit type */
- if (rack_map_split_limit > 0 &&
- rack->r_ctl.rc_num_split_allocs >= rack_map_split_limit) {
+ if (rack_tcp_map_split_limit > 0 &&
+ (rack->do_detection == 0) &&
+ rack->r_ctl.rc_num_split_allocs >= rack_tcp_map_split_limit) {
counter_u64_add(rack_split_limited, 1);
if (!rack->alloc_limit_reported) {
rack->alloc_limit_reported = 1;
@@ -1244,13 +1628,11 @@
}
if (rack->r_ctl.rc_tlpsend == rsm)
rack->r_ctl.rc_tlpsend = NULL;
- if (rack->r_ctl.rc_next == rsm)
- rack->r_ctl.rc_next = NULL;
if (rack->r_ctl.rc_sacklast == rsm)
rack->r_ctl.rc_sacklast = NULL;
if (rack->rc_free_cnt < rack_free_cache) {
memset(rsm, 0, sizeof(struct rack_sendmap));
- TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_next);
+ TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext);
rsm->r_limit_type = 0;
rack->rc_free_cnt++;
return;
@@ -1271,13 +1653,12 @@
#endif
INP_WLOCK_ASSERT(tp->t_inpcb);
-
tp->ccv->nsegs = nsegs;
tp->ccv->bytes_this_ack = BYTES_THIS_ACK(tp, th);
if ((recovery) && (rack->r_ctl.rc_early_recovery_segs)) {
uint32_t max;
- max = rack->r_ctl.rc_early_recovery_segs * tp->t_maxseg;
+ max = rack->r_ctl.rc_early_recovery_segs * ctf_fixed_maxseg(tp);
if (tp->ccv->bytes_this_ack > max) {
tp->ccv->bytes_this_ack = max;
}
@@ -1295,6 +1676,12 @@
SEQ_GEQ(th->th_ack, tp->gput_ack)) {
gput = (((int64_t) (th->th_ack - tp->gput_seq)) << 3) /
max(1, tcp_ts_getticks() - tp->gput_ts);
+ /* We store it in bytes per ms (or kbytes per sec) */
+ rack->r_ctl.rc_gp_history[rack->r_ctl.rc_gp_hist_idx] = gput / 8;
+ rack->r_ctl.rc_gp_hist_idx++;
+ if (rack->r_ctl.rc_gp_hist_idx >= RACK_GP_HIST)
+ rack->r_ctl.rc_gp_hist_filled = 1;
+ rack->r_ctl.rc_gp_hist_idx %= RACK_GP_HIST;
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT,
gput);
/*
@@ -1309,6 +1696,7 @@
tp->t_stats_gput_prev);
tp->t_flags &= ~TF_GPUTINPROG;
tp->t_stats_gput_prev = gput;
+
if (tp->t_maxpeakrate) {
/*
* We update t_peakrate_thr. This gives us roughly
@@ -1320,7 +1708,7 @@
#endif
if (tp->snd_cwnd > tp->snd_ssthresh) {
tp->t_bytes_acked += min(tp->ccv->bytes_this_ack,
- nsegs * V_tcp_abc_l_var * tp->t_maxseg);
+ nsegs * V_tcp_abc_l_var * ctf_fixed_maxseg(tp));
if (tp->t_bytes_acked >= tp->snd_cwnd) {
tp->t_bytes_acked -= tp->snd_cwnd;
tp->ccv->flags |= CCF_ABC_SENTAWND;
@@ -1392,9 +1780,12 @@
/* Suck the next prr cnt back into cwnd */
tp->snd_cwnd += rack->r_ctl.rc_prr_sndcnt;
rack->r_ctl.rc_prr_sndcnt = 0;
+ rack_log_to_prr(rack, 1);
}
tp->snd_recover = tp->snd_una;
EXIT_RECOVERY(tp->t_flags);
+
+
}
static void
@@ -1407,13 +1798,15 @@
rack = (struct tcp_rack *)tp->t_fb_ptr;
switch (type) {
case CC_NDUPACK:
-/* rack->r_ctl.rc_ssthresh_set = 1;*/
+ tp->t_flags &= ~TF_WASFRECOVERY;
+ tp->t_flags &= ~TF_WASCRECOVERY;
if (!IN_FASTRECOVERY(tp->t_flags)) {
rack->r_ctl.rc_tlp_rtx_out = 0;
rack->r_ctl.rc_prr_delivered = 0;
rack->r_ctl.rc_prr_out = 0;
rack->r_ctl.rc_loss_count = 0;
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 2);
rack->r_ctl.rc_prr_recovery_fs = tp->snd_max - tp->snd_una;
tp->snd_recover = tp->snd_max;
if (tp->t_flags & TF_ECN_PERMIT)
@@ -1433,8 +1826,8 @@
tp->t_bytes_acked = 0;
EXIT_RECOVERY(tp->t_flags);
tp->snd_ssthresh = max(2, min(tp->snd_wnd, tp->snd_cwnd) / 2 /
- tp->t_maxseg) * tp->t_maxseg;
- tp->snd_cwnd = tp->t_maxseg;
+ ctf_fixed_maxseg(tp)) * ctf_fixed_maxseg(tp);
+ tp->snd_cwnd = ctf_fixed_maxseg(tp);
break;
case CC_RTO_ERR:
TCPSTAT_INC(tcps_sndrexmitbad);
@@ -1442,10 +1835,14 @@
tp->snd_cwnd = tp->snd_cwnd_prev;
tp->snd_ssthresh = tp->snd_ssthresh_prev;
tp->snd_recover = tp->snd_recover_prev;
- if (tp->t_flags & TF_WASFRECOVERY)
+ if (tp->t_flags & TF_WASFRECOVERY) {
ENTER_FASTRECOVERY(tp->t_flags);
- if (tp->t_flags & TF_WASCRECOVERY)
+ tp->t_flags &= ~TF_WASFRECOVERY;
+ }
+ if (tp->t_flags & TF_WASCRECOVERY) {
ENTER_CONGRECOVERY(tp->t_flags);
+ tp->t_flags &= ~TF_WASCRECOVERY;
+ }
tp->snd_nxt = tp->snd_max;
tp->t_badrxtwin = 0;
break;
@@ -1461,7 +1858,7 @@
static inline void
-rack_cc_after_idle(struct tcpcb *tp, int reduce_largest)
+rack_cc_after_idle(struct tcpcb *tp)
{
uint32_t i_cwnd;
@@ -1475,29 +1872,11 @@
if (CC_ALGO(tp)->after_idle != NULL)
CC_ALGO(tp)->after_idle(tp->ccv);
- if (V_tcp_initcwnd_segments)
- i_cwnd = min((V_tcp_initcwnd_segments * tp->t_maxseg),
- max(2 * tp->t_maxseg, 14600));
- else if (V_tcp_do_rfc3390)
- i_cwnd = min(4 * tp->t_maxseg,
- max(2 * tp->t_maxseg, 4380));
- else {
- /* Per RFC5681 Section 3.1 */
- if (tp->t_maxseg > 2190)
- i_cwnd = 2 * tp->t_maxseg;
- else if (tp->t_maxseg > 1095)
- i_cwnd = 3 * tp->t_maxseg;
- else
- i_cwnd = 4 * tp->t_maxseg;
- }
- if (reduce_largest) {
- /*
- * Do we reduce the largest cwnd to make
- * rack play nice on restart hptsi wise?
- */
- if (((struct tcp_rack *)tp->t_fb_ptr)->r_ctl.rc_rack_largest_cwnd > i_cwnd)
- ((struct tcp_rack *)tp->t_fb_ptr)->r_ctl.rc_rack_largest_cwnd = i_cwnd;
- }
+ if (tp->snd_cwnd == 1)
+ i_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */
+ else
+ i_cwnd = tcp_compute_initwnd(tcp_maxseg(tp));
+
/*
* Being idle is no differnt than the initial window. If the cc
* clamps it down below the initial window raise it to the initial
@@ -1526,320 +1905,6 @@
(tlen <= tp->t_maxseg) && \
(tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN)))
-static inline void
-rack_calc_rwin(struct socket *so, struct tcpcb *tp)
-{
- int32_t win;
-
- /*
- * Calculate amount of space in receive window, and then do TCP
- * input processing. Receive window is amount of space in rcv queue,
- * but not less than advertised window.
- */
- win = sbspace(&so->so_rcv);
- if (win < 0)
- win = 0;
- tp->rcv_wnd = imax(win, (int)(tp->rcv_adv - tp->rcv_nxt));
-}
-
-static void
-rack_do_drop(struct mbuf *m, struct tcpcb *tp)
-{
- /*
- * Drop space held by incoming segment and return.
- */
- if (tp != NULL)
- INP_WUNLOCK(tp->t_inpcb);
- if (m)
- m_freem(m);
-}
-
-static void
-rack_do_dropwithreset(struct mbuf *m, struct tcpcb *tp, struct tcphdr *th, int32_t rstreason, int32_t tlen)
-{
- if (tp != NULL) {
- tcp_dropwithreset(m, th, tp, tlen, rstreason);
- INP_WUNLOCK(tp->t_inpcb);
- } else
- tcp_dropwithreset(m, th, NULL, tlen, rstreason);
-}
-
-/*
- * The value in ret_val informs the caller
- * if we dropped the tcb (and lock) or not.
- * 1 = we dropped it, 0 = the TCB is still locked
- * and valid.
- */
-static void
-rack_do_dropafterack(struct mbuf *m, struct tcpcb *tp, struct tcphdr *th, int32_t thflags, int32_t tlen, int32_t * ret_val)
-{
- /*
- * Generate an ACK dropping incoming segment if it occupies sequence
- * space, where the ACK reflects our state.
- *
- * We can now skip the test for the RST flag since all paths to this
- * code happen after packets containing RST have been dropped.
- *
- * In the SYN-RECEIVED state, don't send an ACK unless the segment
- * we received passes the SYN-RECEIVED ACK test. If it fails send a
- * RST. This breaks the loop in the "LAND" DoS attack, and also
- * prevents an ACK storm between two listening ports that have been
- * sent forged SYN segments, each with the source address of the
- * other.
- */
- struct tcp_rack *rack;
-
- if (tp->t_state == TCPS_SYN_RECEIVED && (thflags & TH_ACK) &&
- (SEQ_GT(tp->snd_una, th->th_ack) ||
- SEQ_GT(th->th_ack, tp->snd_max))) {
- *ret_val = 1;
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
- return;
- } else
- *ret_val = 0;
- rack = (struct tcp_rack *)tp->t_fb_ptr;
- rack->r_wanted_output++;
- tp->t_flags |= TF_ACKNOW;
- if (m)
- m_freem(m);
-}
-
-
-static int
-rack_process_rst(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp)
-{
- /*
- * RFC5961 Section 3.2
- *
- * - RST drops connection only if SEG.SEQ == RCV.NXT. - If RST is in
- * window, we send challenge ACK.
- *
- * Note: to take into account delayed ACKs, we should test against
- * last_ack_sent instead of rcv_nxt. Note 2: we handle special case
- * of closed window, not covered by the RFC.
- */
- int dropped = 0;
-
- if ((SEQ_GEQ(th->th_seq, (tp->last_ack_sent - 1)) &&
- SEQ_LT(th->th_seq, tp->last_ack_sent + tp->rcv_wnd)) ||
- (tp->rcv_wnd == 0 && tp->last_ack_sent == th->th_seq)) {
-
- INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
- KASSERT(tp->t_state != TCPS_SYN_SENT,
- ("%s: TH_RST for TCPS_SYN_SENT th %p tp %p",
- __func__, th, tp));
-
- if (V_tcp_insecure_rst ||
- (tp->last_ack_sent == th->th_seq) ||
- (tp->rcv_nxt == th->th_seq) ||
- ((tp->last_ack_sent - 1) == th->th_seq)) {
- TCPSTAT_INC(tcps_drops);
- /* Drop the connection. */
- switch (tp->t_state) {
- case TCPS_SYN_RECEIVED:
- so->so_error = ECONNREFUSED;
- goto close;
- case TCPS_ESTABLISHED:
- case TCPS_FIN_WAIT_1:
- case TCPS_FIN_WAIT_2:
- case TCPS_CLOSE_WAIT:
- case TCPS_CLOSING:
- case TCPS_LAST_ACK:
- so->so_error = ECONNRESET;
- close:
- tcp_state_change(tp, TCPS_CLOSED);
- /* FALLTHROUGH */
- default:
- tp = tcp_close(tp);
- }
- dropped = 1;
- rack_do_drop(m, tp);
- } else {
- TCPSTAT_INC(tcps_badrst);
- /* Send challenge ACK. */
- tcp_respond(tp, mtod(m, void *), th, m,
- tp->rcv_nxt, tp->snd_nxt, TH_ACK);
- tp->last_ack_sent = tp->rcv_nxt;
- }
- } else {
- m_freem(m);
- }
- return (dropped);
-}
-
-/*
- * The value in ret_val informs the caller
- * if we dropped the tcb (and lock) or not.
- * 1 = we dropped it, 0 = the TCB is still locked
- * and valid.
- */
-static void
-rack_challenge_ack(struct mbuf *m, struct tcphdr *th, struct tcpcb *tp, int32_t * ret_val)
-{
- INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
-
- TCPSTAT_INC(tcps_badsyn);
- if (V_tcp_insecure_syn &&
- SEQ_GEQ(th->th_seq, tp->last_ack_sent) &&
- SEQ_LT(th->th_seq, tp->last_ack_sent + tp->rcv_wnd)) {
- tp = tcp_drop(tp, ECONNRESET);
- *ret_val = 1;
- rack_do_drop(m, tp);
- } else {
- /* Send challenge ACK. */
- tcp_respond(tp, mtod(m, void *), th, m, tp->rcv_nxt,
- tp->snd_nxt, TH_ACK);
- tp->last_ack_sent = tp->rcv_nxt;
- m = NULL;
- *ret_val = 0;
- rack_do_drop(m, NULL);
- }
-}
-
-/*
- * rack_ts_check returns 1 for you should not proceed. It places
- * in ret_val what should be returned 1/0 by the caller. The 1 indicates
- * that the TCB is unlocked and probably dropped. The 0 indicates the
- * TCB is still valid and locked.
- */
-static int
-rack_ts_check(struct mbuf *m, struct tcphdr *th, struct tcpcb *tp, int32_t tlen, int32_t thflags, int32_t * ret_val)
-{
-
- /* Check to see if ts_recent is over 24 days old. */
- if (tcp_ts_getticks() - tp->ts_recent_age > TCP_PAWS_IDLE) {
- /*
- * Invalidate ts_recent. If this segment updates ts_recent,
- * the age will be reset later and ts_recent will get a
- * valid value. If it does not, setting ts_recent to zero
- * will at least satisfy the requirement that zero be placed
- * in the timestamp echo reply when ts_recent isn't valid.
- * The age isn't reset until we get a valid ts_recent
- * because we don't want out-of-order segments to be dropped
- * when ts_recent is old.
- */
- tp->ts_recent = 0;
- } else {
- TCPSTAT_INC(tcps_rcvduppack);
- TCPSTAT_ADD(tcps_rcvdupbyte, tlen);
- TCPSTAT_INC(tcps_pawsdrop);
- *ret_val = 0;
- if (tlen) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
- } else {
- rack_do_drop(m, NULL);
- }
- return (1);
- }
- return (0);
-}
-
-/*
- * rack_drop_checks returns 1 for you should not proceed. It places
- * in ret_val what should be returned 1/0 by the caller. The 1 indicates
- * that the TCB is unlocked and probably dropped. The 0 indicates the
- * TCB is still valid and locked.
- */
-static int
-rack_drop_checks(struct tcpopt *to, struct mbuf *m, struct tcphdr *th, struct tcpcb *tp, int32_t * tlenp, int32_t * thf, int32_t * drop_hdrlen, int32_t * ret_val)
-{
- int32_t todrop;
- int32_t thflags;
- int32_t tlen;
-
- thflags = *thf;
- tlen = *tlenp;
- todrop = tp->rcv_nxt - th->th_seq;
- if (todrop > 0) {
- if (thflags & TH_SYN) {
- thflags &= ~TH_SYN;
- th->th_seq++;
- if (th->th_urp > 1)
- th->th_urp--;
- else
- thflags &= ~TH_URG;
- todrop--;
- }
- /*
- * Following if statement from Stevens, vol. 2, p. 960.
- */
- if (todrop > tlen
- || (todrop == tlen && (thflags & TH_FIN) == 0)) {
- /*
- * Any valid FIN must be to the left of the window.
- * At this point the FIN must be a duplicate or out
- * of sequence; drop it.
- */
- thflags &= ~TH_FIN;
- /*
- * Send an ACK to resynchronize and drop any data.
- * But keep on processing for RST or ACK.
- */
- tp->t_flags |= TF_ACKNOW;
- todrop = tlen;
- TCPSTAT_INC(tcps_rcvduppack);
- TCPSTAT_ADD(tcps_rcvdupbyte, todrop);
- } else {
- TCPSTAT_INC(tcps_rcvpartduppack);
- TCPSTAT_ADD(tcps_rcvpartdupbyte, todrop);
- }
- if (tp->t_flags & TF_SACK_PERMIT) {
- /*
- * record the left, to-be-dropped edge of data
- * here, for use as dsack block further down
- */
- tcp_update_sack_list(tp, th->th_seq,
- th->th_seq + todrop);
- /*
- * ACK now, as the next in-sequence segment
- * will clear the DSACK block again
- */
- tp->t_flags |= TF_ACKNOW;
- }
- *drop_hdrlen += todrop; /* drop from the top afterwards */
- th->th_seq += todrop;
- tlen -= todrop;
- if (th->th_urp > todrop)
- th->th_urp -= todrop;
- else {
- thflags &= ~TH_URG;
- th->th_urp = 0;
- }
- }
- /*
- * If segment ends after window, drop trailing data (and PUSH and
- * FIN); if nothing left, just ACK.
- */
- todrop = (th->th_seq + tlen) - (tp->rcv_nxt + tp->rcv_wnd);
- if (todrop > 0) {
- TCPSTAT_INC(tcps_rcvpackafterwin);
- if (todrop >= tlen) {
- TCPSTAT_ADD(tcps_rcvbyteafterwin, tlen);
- /*
- * If window is closed can only take segments at
- * window edge, and have to drop data and PUSH from
- * incoming segments. Continue processing, but
- * remember to ack. Otherwise, drop segment and
- * ack.
- */
- if (tp->rcv_wnd == 0 && th->th_seq == tp->rcv_nxt) {
- tp->t_flags |= TF_ACKNOW;
- TCPSTAT_INC(tcps_rcvwinprobe);
- } else {
- rack_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
- return (1);
- }
- } else
- TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop);
- m_adj(m, -todrop);
- tlen -= todrop;
- thflags &= ~(TH_PUSH | TH_FIN);
- }
- *thf = thflags;
- *tlenp = tlen;
- return (0);
-}
-
static struct rack_sendmap *
rack_find_lowest_rsm(struct tcp_rack *rack)
{
@@ -1872,7 +1937,7 @@
*/
counter_u64_add(rack_find_high, 1);
prsm = rsm;
- TAILQ_FOREACH_REVERSE_FROM(prsm, &rack->r_ctl.rc_map, rack_head, r_next) {
+ RB_FOREACH_REVERSE_FROM(prsm, rack_rb_tree_head, rsm) {
if (prsm->r_flags & (RACK_ACKED | RACK_HAS_FIN)) {
continue;
}
@@ -1944,7 +2009,6 @@
thresh += 1;
}
/* We don't let the rack timeout be above a RTO */
-
if (thresh > TICKS_2_MSEC(rack->rc_tp->t_rxtcur)) {
thresh = TICKS_2_MSEC(rack->rc_tp->t_rxtcur);
}
@@ -1971,7 +2035,7 @@
thresh = (srtt * 2);
/* Get the previous sent packet, if any */
- maxseg = tcp_maxseg(tp);
+ maxseg = ctf_fixed_maxseg(tp);
counter_u64_add(rack_enter_tlp_calc, 1);
len = rsm->r_end - rsm->r_start;
if (rack->rack_tlp_threshold_use == TLP_USE_ID) {
@@ -2044,6 +2108,24 @@
return (thresh);
}
+static uint32_t
+rack_grab_rtt(struct tcpcb *tp, struct tcp_rack *rack)
+{
+ /*
+ * We want the rack_rtt which is the
+ * last rtt we measured. However if that
+ * does not exist we fallback to the srtt (which
+ * we probably will never do) and then as a last
+ * resort we use RACK_INITIAL_RTO if no srtt is
+ * yet set.
+ */
+ if (rack->rc_rack_rtt)
+ return(rack->rc_rack_rtt);
+ else if (tp->t_srtt == 0)
+ return(RACK_INITIAL_RTO);
+ return (TICKS_2_MSEC(tp->t_srtt >> TCP_RTT_SHIFT));
+}
+
static struct rack_sendmap *
rack_check_recovery_mode(struct tcpcb *tp, uint32_t tsused)
{
@@ -2055,17 +2137,12 @@
struct tcp_rack *rack;
struct rack_sendmap *rsm;
int32_t idx;
- uint32_t srtt_cur, srtt, thresh;
+ uint32_t srtt, thresh;
rack = (struct tcp_rack *)tp->t_fb_ptr;
- if (TAILQ_EMPTY(&rack->r_ctl.rc_map)) {
+ if (RB_EMPTY(&rack->r_ctl.rc_mtree)) {
return (NULL);
}
- srtt_cur = tp->t_srtt >> TCP_RTT_SHIFT;
- srtt = TICKS_2_MSEC(srtt_cur);
- if (rack->rc_rack_rtt && (srtt > rack->rc_rack_rtt))
- srtt = rack->rc_rack_rtt;
-
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
if (rsm == NULL)
return (NULL);
@@ -2076,6 +2153,7 @@
return (NULL);
}
idx = rsm->r_rtr_cnt - 1;
+ srtt = rack_grab_rtt(tp, rack);
thresh = rack_calc_thresh_rack(rack, srtt, tsused);
if (tsused < rsm->r_tim_lastsent[idx]) {
return (NULL);
@@ -2100,7 +2178,7 @@
t = TICKS_2_MSEC((tp->t_srtt >> TCP_RTT_SHIFT) + ((tp->t_rttvar * 4) >> TCP_RTT_SHIFT));
TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift],
- tcp_persmin, tcp_persmax);
+ rack_persist_min, rack_persist_max);
if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
tp->t_rxtshift++;
rack->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT;
@@ -2109,7 +2187,7 @@
}
static uint32_t
-rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
+rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int sup_rack)
{
/*
* Start the FR timer, we do this based on getting the first one in
@@ -2117,7 +2195,7 @@
* events we need to stop the running timer (if its running) before
* starting the new one.
*/
- uint32_t thresh, exp, to, srtt, time_since_sent;
+ uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse;
uint32_t srtt_cur;
int32_t idx;
int32_t is_tlp_timer = 0;
@@ -2131,13 +2209,31 @@
/* We can't start any timer in persists */
return (rack_get_persists_timer_val(tp, rack));
}
+ if ((tp->t_state < TCPS_ESTABLISHED) ||
+ ((tp->t_flags & TF_SACK_PERMIT) == 0))
+ goto activate_rxt;
rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
- if (rsm == NULL) {
+ if ((rsm == NULL) || sup_rack) {
/* Nothing on the send map */
activate_rxt:
+ time_since_sent = 0;
+ rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
+ if (rsm) {
+ idx = rsm->r_rtr_cnt - 1;
+ if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], rack->r_ctl.rc_tlp_rxt_last_time))
+ tstmp_touse = rsm->r_tim_lastsent[idx];
+ else
+ tstmp_touse = rack->r_ctl.rc_tlp_rxt_last_time;
+ if (TSTMP_GT(tstmp_touse, cts))
+ time_since_sent = cts - tstmp_touse;
+ }
if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) {
rack->r_ctl.rc_hpts_flags |= PACE_TMR_RXT;
to = TICKS_2_MSEC(tp->t_rxtcur);
+ if (to > time_since_sent)
+ to -= time_since_sent;
+ else
+ to = rack->r_ctl.rc_min_to;
if (to == 0)
to = 1;
return (to);
@@ -2151,6 +2247,16 @@
goto activate_rxt;
}
}
+ if (rack->sack_attack_disable) {
+ /*
+ * We don't want to do
+ * any TLP's if you are an attacker.
+ * Though if you are doing what
+ * is expected you may still have
+ * SACK-PASSED marks.
+ */
+ goto activate_rxt;
+ }
/* Convert from ms to usecs */
if (rsm->r_flags & RACK_SACK_PASSED) {
if ((tp->t_flags & TF_SENTFIN) &&
@@ -2162,12 +2268,20 @@
*/
goto activate_rxt;
}
- if (tp->t_srtt) {
- srtt_cur = (tp->t_srtt >> TCP_RTT_SHIFT);
- srtt = TICKS_2_MSEC(srtt_cur);
- } else
- srtt = RACK_INITIAL_RTO;
-
+ if ((rack->use_rack_cheat == 0) &&
+ (IN_RECOVERY(tp->t_flags)) &&
+ (rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) {
+ /*
+ * We are not cheating, in recovery and
+ * not enough ack's to yet get our next
+ * retransmission out.
+ *
+ * Note that classified attackers do not
+ * get to use the rack-cheat.
+ */
+ goto activate_tlp;
+ }
+ srtt = rack_grab_rtt(tp, rack);
thresh = rack_calc_thresh_rack(rack, srtt, cts);
idx = rsm->r_rtr_cnt - 1;
exp = rsm->r_tim_lastsent[idx] + thresh;
@@ -2181,6 +2295,7 @@
}
} else {
/* Ok we need to do a TLP not RACK */
+activate_tlp:
if ((rack->rc_tlp_in_progress != 0) ||
(rack->r_ctl.rc_tlp_rtx_out != 0)) {
/*
@@ -2189,12 +2304,6 @@
*/
goto activate_rxt;
}
- if ((tp->snd_max - tp->snd_una) > tp->snd_wnd) {
- /*
- * Peer collapsed rwnd, don't do TLP.
- */
- goto activate_rxt;
- }
rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_tmap, rack_sendmap, r_tnext);
if (rsm == NULL) {
/* We found no rsm to TLP with. */
@@ -2206,10 +2315,13 @@
goto activate_rxt;
}
idx = rsm->r_rtr_cnt - 1;
- if (TSTMP_GT(cts, rsm->r_tim_lastsent[idx]))
- time_since_sent = cts - rsm->r_tim_lastsent[idx];
- else
- time_since_sent = 0;
+ time_since_sent = 0;
+ if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], rack->r_ctl.rc_tlp_rxt_last_time))
+ tstmp_touse = rsm->r_tim_lastsent[idx];
+ else
+ tstmp_touse = rack->r_ctl.rc_tlp_rxt_last_time;
+ if (TSTMP_GT(tstmp_touse, cts))
+ time_since_sent = cts - tstmp_touse;
is_tlp_timer = 1;
if (tp->t_srtt) {
srtt_cur = (tp->t_srtt >> TCP_RTT_SHIFT);
@@ -2260,10 +2372,6 @@
rack_enter_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
if (rack->rc_in_persist == 0) {
- if (((tp->t_flags & TF_SENTFIN) == 0) &&
- (tp->snd_max - tp->snd_una) >= sbavail(&rack->rc_inp->inp_socket->so_snd))
- /* Must need to send more data to enter persist */
- return;
rack->r_ctl.rc_went_idle_time = cts;
rack_timer_cancel(tp, rack, cts, __LINE__);
tp->t_rxtshift = 0;
@@ -2285,8 +2393,8 @@
}
static void
-rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int32_t line,
- int32_t slot, uint32_t tot_len_this_send, int32_t frm_out_sbavail)
+rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts,
+ int32_t slot, uint32_t tot_len_this_send, int sup_rack)
{
struct inpcb *inp;
uint32_t delayed_ack = 0;
@@ -2299,7 +2407,6 @@
/* A previous call is already set up */
return;
}
-
if ((tp->t_state == TCPS_CLOSED) ||
(tp->t_state == TCPS_LISTEN)) {
return;
@@ -2308,6 +2415,7 @@
if (stopped && TSTMP_GT(rack->r_ctl.rc_timer_exp, cts)) {
left = rack->r_ctl.rc_timer_exp - cts;
}
+ rack->tlp_timer_up = 0;
rack->r_ctl.rc_timer_exp = 0;
if (rack->rc_inp->inp_in_hpts == 0) {
rack->r_ctl.rc_hpts_flags = 0;
@@ -2325,23 +2433,21 @@
else
slot = 1;
}
- if ((tp->snd_wnd == 0) && TCPS_HAVEESTABLISHED(tp->t_state)) {
- /* No send window.. we must enter persist */
- rack_enter_persist(tp, rack, cts);
- } else if ((frm_out_sbavail &&
- (frm_out_sbavail > (tp->snd_max - tp->snd_una)) &&
- (tp->snd_wnd < tp->t_maxseg)) &&
- TCPS_HAVEESTABLISHED(tp->t_state)) {
+ hpts_timeout = rack_timer_start(tp, rack, cts, sup_rack);
+ if (rack->sack_attack_disable &&
+ (slot < USEC_TO_MSEC(tcp_sad_pacing_interval))) {
/*
- * If we have no window or we can't send a segment (and have
- * data to send.. we cheat here and frm_out_sbavail is
- * passed in with the sbavail(sb) only from bbr_output) and
- * we are established, then we must enter persits (if not
- * already in persits).
+ * We have a potential attacker on
+ * the line. We have possibly some
+ * (or now) pacing time set. We want to
+ * slow down the processing of sacks by some
+ * amount (if it is an attacker). Set the default
+ * slot for attackers in place (unless the orginal
+ * interval is longer). Its stored in
+ * micro-seconds, so lets convert to msecs.
*/
- rack_enter_persist(tp, rack, cts);
+ slot = USEC_TO_MSEC(tcp_sad_pacing_interval);
}
- hpts_timeout = rack_timer_start(tp, rack, cts);
if (tp->t_flags & TF_DELACK) {
delayed_ack = TICKS_2_MSEC(tcp_delacktime);
rack->r_ctl.rc_hpts_flags |= PACE_TMR_DELACK;
@@ -2398,6 +2504,11 @@
rack->r_ctl.rc_timer_exp = cts + hpts_timeout;
}
if (slot) {
+ rack->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
+ if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK)
+ inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
+ else
+ inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
rack->r_ctl.rc_last_output_to = cts + slot;
if ((hpts_timeout == 0) || (hpts_timeout > slot)) {
if (rack->rc_inp->inp_in_hpts == 0)
@@ -2413,6 +2524,15 @@
rack_log_to_start(rack, cts, hpts_timeout, slot, 0);
}
} else if (hpts_timeout) {
+ if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) {
+ /* For a rack timer, don't wake us */
+ rack->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
+ inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
+ } else {
+ /* All other timers wake us up */
+ rack->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
+ inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
+ }
if (rack->rc_inp->inp_in_hpts == 0)
tcp_hpts_insert(tp->t_inpcb, HPTS_MS_TO_SLOTS(hpts_timeout));
rack_log_to_start(rack, cts, hpts_timeout, slot, 0);
@@ -2448,7 +2568,7 @@
* settings.
*/
struct rack_sendmap *rsm;
- int32_t recovery;
+ int32_t recovery, ll;
if (tp->t_timers->tt_flags & TT_STOPPED) {
return (1);
@@ -2457,12 +2577,16 @@
/* Its not time yet */
return (0);
}
- rack_log_to_event(rack, RACK_TO_FRM_RACK);
recovery = IN_RECOVERY(tp->t_flags);
counter_u64_add(rack_to_tot, 1);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
rsm = rack_check_recovery_mode(tp, cts);
+ if (rsm)
+ ll = rsm->r_end - rsm->r_start;
+ else
+ ll = 0;
+ rack_log_to_event(rack, RACK_TO_FRM_RACK, ll);
if (rsm) {
uint32_t rtt;
@@ -2470,23 +2594,23 @@
if (rtt == 0)
rtt = 1;
if ((recovery == 0) &&
- (rack->r_ctl.rc_prr_sndcnt < tp->t_maxseg)) {
+ (rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) {
/*
* The rack-timeout that enter's us into recovery
* will force out one MSS and set us up so that we
* can do one more send in 2*rtt (transitioning the
* rack timeout into a rack-tlp).
*/
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
- } else if ((rack->r_ctl.rc_prr_sndcnt < tp->t_maxseg) &&
- ((rsm->r_end - rsm->r_start) > rack->r_ctl.rc_prr_sndcnt)) {
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 3);
+ } else if ((rack->r_ctl.rc_prr_sndcnt < (rsm->r_end - rsm->r_start)) &&
+ rack->use_rack_cheat) {
/*
- * When a rack timer goes, we have to send at
- * least one segment. They will be paced a min of 1ms
- * apart via the next rack timer (or further
- * if the rack timer dictates it).
+ * When a rack timer goes, if the rack cheat is
+ * on, arrange it so we can send a full segment.
*/
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 4);
}
} else {
/* This is a case that should happen rarely if ever */
@@ -2500,6 +2624,24 @@
return (0);
}
+static __inline void
+rack_clone_rsm(struct tcp_rack *rack, struct rack_sendmap *nrsm,
+ struct rack_sendmap *rsm, uint32_t start)
+{
+ int idx;
+
+ nrsm->r_start = start;
+ nrsm->r_end = rsm->r_end;
+ nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
+ nrsm->r_flags = rsm->r_flags;
+ nrsm->r_dupack = rsm->r_dupack;
+ nrsm->r_rtr_bytes = 0;
+ rsm->r_end = nrsm->r_start;
+ for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
+ nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
+ }
+}
+
static struct rack_sendmap *
rack_merge_rsm(struct tcp_rack *rack,
struct rack_sendmap *l_rsm,
@@ -2515,19 +2657,32 @@
* is any reason we need to try to find
* the oldest (or last oldest retransmitted).
*/
+ struct rack_sendmap *rm;
+
l_rsm->r_end = r_rsm->r_end;
+ if (l_rsm->r_dupack < r_rsm->r_dupack)
+ l_rsm->r_dupack = r_rsm->r_dupack;
if (r_rsm->r_rtr_bytes)
l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes;
if (r_rsm->r_in_tmap) {
/* This really should not happen */
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, r_rsm, r_tnext);
+ r_rsm->r_in_tmap = 0;
}
/* Now the flags */
if (r_rsm->r_flags & RACK_HAS_FIN)
l_rsm->r_flags |= RACK_HAS_FIN;
if (r_rsm->r_flags & RACK_TLP)
l_rsm->r_flags |= RACK_TLP;
- TAILQ_REMOVE(&rack->r_ctl.rc_map, r_rsm, r_next);
+ if (r_rsm->r_flags & RACK_RWND_COLLAPSED)
+ l_rsm->r_flags |= RACK_RWND_COLLAPSED;
+ rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, r_rsm);
+#ifdef INVARIANTS
+ if (rm != r_rsm) {
+ panic("removing head in rack:%p rsm:%p rm:%p",
+ rack, r_rsm, rm);
+ }
+#endif
if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) {
/* Transfer the split limit to the map we free */
r_rsm->r_limit_type = l_rsm->r_limit_type;
@@ -2552,9 +2707,11 @@
* Tail Loss Probe.
*/
struct rack_sendmap *rsm = NULL;
+ struct rack_sendmap *insret;
struct socket *so;
uint32_t amm, old_prr_snd = 0;
uint32_t out, avail;
+ int collapsed_win = 0;
if (tp->t_timers->tt_flags & TT_STOPPED) {
return (1);
@@ -2571,14 +2728,28 @@
* A TLP timer has expired. We have been idle for 2 rtts. So we now
* need to figure out how to force a full MSS segment out.
*/
- rack_log_to_event(rack, RACK_TO_FRM_TLP);
+ rack_log_to_event(rack, RACK_TO_FRM_TLP, 0);
counter_u64_add(rack_tlp_tot, 1);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
so = tp->t_inpcb->inp_socket;
+#ifdef KERN_TLS
+ if (rack->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) {
+ /*
+ * For hardware TLS we do *not* want to send
+ * new data, lets instead just do a retransmission.
+ */
+ goto need_retran;
+ }
+#endif
avail = sbavail(&so->so_snd);
out = tp->snd_max - tp->snd_una;
- rack->rc_timer_up = 1;
+ rack->tlp_timer_up = 1;
+ if (out > tp->snd_wnd) {
+ /* special case, we need a retransmission */
+ collapsed_win = 1;
+ goto need_retran;
+ }
/*
* If we are in recovery we can jazz out a segment if new data is
* present simply by setting rc_prr_sndcnt to a segment.
@@ -2587,18 +2758,19 @@
((rack_always_send_oldest == 0) || (TAILQ_EMPTY(&rack->r_ctl.rc_tmap)))) {
/* New data is available */
amm = avail - out;
- if (amm > tp->t_maxseg) {
- amm = tp->t_maxseg;
- } else if ((amm < tp->t_maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) {
+ if (amm > ctf_fixed_maxseg(tp)) {
+ amm = ctf_fixed_maxseg(tp);
+ } else if ((amm < ctf_fixed_maxseg(tp)) && ((tp->t_flags & TF_NODELAY) == 0)) {
/* not enough to fill a MTU and no-delay is off */
goto need_retran;
}
if (IN_RECOVERY(tp->t_flags)) {
/* Unlikely */
old_prr_snd = rack->r_ctl.rc_prr_sndcnt;
- if (out + amm <= tp->snd_wnd)
+ if (out + amm <= tp->snd_wnd) {
rack->r_ctl.rc_prr_sndcnt = amm;
- else
+ rack_log_to_prr(rack, 4);
+ } else
goto need_retran;
} else {
/* Set the send-new override */
@@ -2618,28 +2790,52 @@
* Ok we need to arrange the last un-acked segment to be re-sent, or
* optionally the first un-acked segment.
*/
- if (rack_always_send_oldest)
- rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
- else {
- rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_map, rack_sendmap, r_next);
- if (rsm && (rsm->r_flags & (RACK_ACKED | RACK_HAS_FIN))) {
- rsm = rack_find_high_nonack(rack, rsm);
+ if (collapsed_win == 0) {
+ if (rack_always_send_oldest)
+ rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
+ else {
+ rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if (rsm && (rsm->r_flags & (RACK_ACKED | RACK_HAS_FIN))) {
+ rsm = rack_find_high_nonack(rack, rsm);
+ }
}
- }
- if (rsm == NULL) {
- counter_u64_add(rack_tlp_does_nada, 1);
+ if (rsm == NULL) {
+ counter_u64_add(rack_tlp_does_nada, 1);
#ifdef TCP_BLACKBOX
- tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
+ tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
#endif
- goto out;
+ goto out;
+ }
+ } else {
+ /*
+ * We must find the last segment
+ * that was acceptable by the client.
+ */
+ RB_FOREACH_REVERSE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
+ if ((rsm->r_flags & RACK_RWND_COLLAPSED) == 0) {
+ /* Found one */
+ break;
+ }
+ }
+ if (rsm == NULL) {
+ /* None? if so send the first */
+ rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if (rsm == NULL) {
+ counter_u64_add(rack_tlp_does_nada, 1);
+#ifdef TCP_BLACKBOX
+ tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
+#endif
+ goto out;
+ }
+ }
}
- if ((rsm->r_end - rsm->r_start) > tp->t_maxseg) {
+ if ((rsm->r_end - rsm->r_start) > ctf_fixed_maxseg(tp)) {
/*
* We need to split this the last segment in two.
*/
- int32_t idx;
struct rack_sendmap *nrsm;
+
nrsm = rack_alloc_full_limit(rack);
if (nrsm == NULL) {
/*
@@ -2649,17 +2845,15 @@
counter_u64_add(rack_tlp_does_nada, 1);
goto out;
}
- nrsm->r_start = (rsm->r_end - tp->t_maxseg);
- nrsm->r_end = rsm->r_end;
- nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
- nrsm->r_flags = rsm->r_flags;
- nrsm->r_sndcnt = rsm->r_sndcnt;
- nrsm->r_rtr_bytes = 0;
- rsm->r_end = nrsm->r_start;
- for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
- nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
+ rack_clone_rsm(rack, nrsm, rsm,
+ (rsm->r_end - ctf_fixed_maxseg(tp)));
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
}
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next);
+#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
@@ -2684,11 +2878,12 @@
* peer in max times. We need the retransmit timer to take
* over.
*/
-restore:
+ restore:
rack->r_ctl.rc_tlpsend = NULL;
if (rsm)
rsm->r_flags &= ~RACK_TLP;
rack->r_ctl.rc_prr_sndcnt = old_prr_snd;
+ rack_log_to_prr(rack, 5);
counter_u64_add(rack_tlp_retran_fail, 1);
goto out;
} else if (rsm) {
@@ -2708,7 +2903,7 @@
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
return (0);
out:
- rack->rc_timer_up = 0;
+ rack->tlp_timer_up = 0;
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
return (0);
}
@@ -2727,7 +2922,7 @@
if (tp->t_timers->tt_flags & TT_STOPPED) {
return (1);
}
- rack_log_to_event(rack, RACK_TO_FRM_DELACK);
+ rack_log_to_event(rack, RACK_TO_FRM_DELACK, 0);
tp->t_flags &= ~TF_DELACK;
tp->t_flags |= TF_ACKNOW;
TCPSTAT_INC(tcps_delack);
@@ -2746,8 +2941,9 @@
static int
rack_timeout_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
+ struct tcptemp *t_template;
struct inpcb *inp;
- int32_t retval = 0;
+ int32_t retval = 1;
inp = tp->t_inpcb;
@@ -2795,9 +2991,22 @@
tcp_set_inp_to_drop(rack->rc_inp, ETIMEDOUT);
goto out;
}
- tp->t_flags |= TF_FORCEDATA;
+ t_template = tcpip_maketemplate(rack->rc_inp);
+ if (t_template) {
+ tcp_respond(tp, t_template->tt_ipgen,
+ &t_template->tt_t, (struct mbuf *)NULL,
+ tp->rcv_nxt, tp->snd_una - 1, 0);
+ /* This sends an ack */
+ if (tp->t_flags & TF_DELACK)
+ tp->t_flags &= ~TF_DELACK;
+ free(t_template, M_TEMP);
+ }
+ if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
+ tp->t_rxtshift++;
out:
- rack_log_to_event(rack, RACK_TO_FRM_PERSIST);
+ rack_log_to_event(rack, RACK_TO_FRM_PERSIST, 0);
+ rack_start_hpts_timer(rack, tp, cts,
+ 0, 0, 0);
return (retval);
}
@@ -2818,7 +3027,7 @@
}
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP;
inp = tp->t_inpcb;
- rack_log_to_event(rack, RACK_TO_FRM_KEEP);
+ rack_log_to_event(rack, RACK_TO_FRM_KEEP, 0);
/*
* Keep-alive timer went off; send something or drop connection if
* idle for too long.
@@ -2849,7 +3058,7 @@
free(t_template, M_TEMP);
}
}
- rack_start_hpts_timer(rack, tp, cts, __LINE__, 0, 0, 0);
+ rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
return (1);
dropit:
TCPSTAT_INC(tcps_keepdrops);
@@ -2874,7 +3083,7 @@
rack = (struct tcp_rack *)tp->t_fb_ptr;
rack_timer_cancel(tp, rack, tcp_ts_getticks(), __LINE__);
- rack_log_to_event(rack, RACK_TO_FRM_TMR);
+ rack_log_to_event(rack, RACK_TO_FRM_TMR, 0);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
/*
@@ -2885,10 +3094,11 @@
* so for now we will just let the normal rxt timer
* and tlp timer take care of it.
*/
- TAILQ_FOREACH(rsm, &rack->r_ctl.rc_map, r_next) {
+ RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
if (rsm->r_flags & RACK_ACKED) {
cnt++;
- rsm->r_sndcnt = 0;
+ rsm->r_dupack = 0;
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
if (rsm->r_in_tmap == 0) {
/* We must re-add it back to the tlist */
if (trsm == NULL) {
@@ -2897,9 +3107,9 @@
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, trsm, rsm, r_tnext);
}
rsm->r_in_tmap = 1;
- trsm = rsm;
}
}
+ trsm = rsm;
rsm->r_flags &= ~(RACK_ACKED | RACK_SACK_PASSED | RACK_WAS_SACKPASS);
}
/* Clear the count (we just un-acked them) */
@@ -2907,10 +3117,9 @@
/* Clear the tlp rtx mark */
rack->r_ctl.rc_tlp_rtx_out = 0;
rack->r_ctl.rc_tlp_seg_send_cnt = 0;
- rack->r_ctl.rc_resend = TAILQ_FIRST(&rack->r_ctl.rc_map);
- /* Setup so we send one segment */
- if (rack->r_ctl.rc_prr_sndcnt < tp->t_maxseg)
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
+ rack->r_ctl.rc_resend = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ rack->r_ctl.rc_prr_sndcnt = 0;
+ rack_log_to_prr(rack, 6);
rack->r_timer_override = 1;
}
@@ -2944,7 +3153,18 @@
* retransmit interval. Back off to a longer retransmit interval
* and retransmit one segment.
*/
- if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
+ rack_remxt_tmr(tp);
+ if ((rack->r_ctl.rc_resend == NULL) ||
+ ((rack->r_ctl.rc_resend->r_flags & RACK_RWND_COLLAPSED) == 0)) {
+ /*
+ * If the rwnd collapsed on
+ * the one we are retransmitting
+ * it does not count against the
+ * rxt count.
+ */
+ tp->t_rxtshift++;
+ }
+ if (tp->t_rxtshift > TCP_MAXRXTSHIFT) {
tp->t_rxtshift = TCP_MAXRXTSHIFT;
TCPSTAT_INC(tcps_timeoutdrop);
retval = 1;
@@ -2952,7 +3172,6 @@
(tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT));
goto out;
}
- rack_remxt_tmr(tp);
if (tp->t_state == TCPS_SYN_SENT) {
/*
* If the SYN was retransmitted, indicate CWND to be limited
@@ -2987,7 +3206,7 @@
TCPSTAT_INC(tcps_rexmttimeo);
if ((tp->t_state == TCPS_SYN_SENT) ||
(tp->t_state == TCPS_SYN_RECEIVED))
- rexmt = MSEC_2_TICKS(RACK_INITIAL_RTO * tcp_syn_backoff[tp->t_rxtshift]);
+ rexmt = MSEC_2_TICKS(RACK_INITIAL_RTO * tcp_backoff[tp->t_rxtshift]);
else
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
TCPT_RANGESET(tp->t_rxtcur, rexmt,
@@ -3089,16 +3308,6 @@
}
}
/*
- * Disable RFC1323 and SACK if we haven't got any response to our
- * third SYN to work-around some broken terminal servers (most of
- * which have hopefully been retired) that have bad VJ header
- * compression code which trashes TCP segments containing
- * unknown-to-them TCP options.
- */
- if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) &&
- (tp->t_rxtshift == 3))
- tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT);
- /*
* If we backed off this far, our srtt estimate is probably bogus.
* Clobber it so we'll take the next rtt measurement as our srtt;
* move the current srtt into rttvar to keep the current retransmit
@@ -3168,10 +3377,13 @@
if (timers & PACE_TMR_DELACK) {
ret = rack_timeout_delack(tp, rack, cts);
} else if (timers & PACE_TMR_RACK) {
+ rack->r_ctl.rc_tlp_rxt_last_time = cts;
ret = rack_timeout_rack(tp, rack, cts);
} else if (timers & PACE_TMR_TLP) {
+ rack->r_ctl.rc_tlp_rxt_last_time = cts;
ret = rack_timeout_tlp(tp, rack, cts);
} else if (timers & PACE_TMR_RXT) {
+ rack->r_ctl.rc_tlp_rxt_last_time = cts;
ret = rack_timeout_rxt(tp, rack, cts);
} else if (timers & PACE_TMR_PERSIT) {
ret = rack_timeout_persist(tp, rack, cts);
@@ -3262,7 +3474,8 @@
int32_t idx;
rsm->r_rtr_cnt++;
- rsm->r_sndcnt++;
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
+ rsm->r_dupack = 0;
if (rsm->r_rtr_cnt > RACK_NUM_OF_RETRANS) {
rsm->r_rtr_cnt = RACK_NUM_OF_RETRANS;
rsm->r_flags |= RACK_OVERMAX;
@@ -3280,6 +3493,7 @@
}
if (rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 0;
}
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
@@ -3288,23 +3502,20 @@
rsm->r_flags &= ~RACK_SACK_PASSED;
rsm->r_flags |= RACK_WAS_SACKPASS;
}
- /* Update memory for next rtr */
- rack->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next);
}
static uint32_t
rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack,
- struct rack_sendmap *rsm, uint32_t ts, int32_t * lenp)
+ struct rack_sendmap *rsm, uint32_t ts, int32_t *lenp)
{
/*
* We (re-)transmitted starting at rsm->r_start for some length
* (possibly less than r_end.
*/
- struct rack_sendmap *nrsm;
+ struct rack_sendmap *nrsm, *insret;
uint32_t c_end;
int32_t len;
- int32_t idx;
len = *lenp;
c_end = rsm->r_start + len;
@@ -3346,17 +3557,16 @@
* we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to
* 1, 6 and the new piece will be 6, 11.
*/
- nrsm->r_start = c_end;
- nrsm->r_end = rsm->r_end;
- nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
- nrsm->r_flags = rsm->r_flags;
- nrsm->r_sndcnt = rsm->r_sndcnt;
- nrsm->r_rtr_bytes = 0;
- rsm->r_end = c_end;
- for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
- nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
+ rack_clone_rsm(rack, nrsm, rsm, c_end);
+ nrsm->r_dupack = 0;
+ rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2);
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
}
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next);
+#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
@@ -3374,9 +3584,8 @@
uint8_t pass, struct rack_sendmap *hintrsm)
{
struct tcp_rack *rack;
- struct rack_sendmap *rsm, *nrsm;
+ struct rack_sendmap *rsm, *nrsm, *insret, fe;
register uint32_t snd_max, snd_una;
- int32_t idx;
/*
* Add to the RACK log of packets in flight or retransmitted. If
@@ -3426,7 +3635,10 @@
end = seq_out + len;
seq_out = snd_una;
- len = end - seq_out;
+ if (SEQ_GEQ(end, seq_out))
+ len = end - seq_out;
+ else
+ len = 0;
}
snd_max = tp->snd_max;
if (th_flags & (TH_SYN | TH_FIN)) {
@@ -3456,8 +3668,9 @@
if (IN_RECOVERY(tp->t_flags)) {
rack->r_ctl.rc_prr_out += len;
}
- /* First question is it a retransmission? */
+ /* First question is it a retransmission or new? */
if (seq_out == snd_max) {
+ /* Its new */
again:
rsm = rack_alloc(rack);
if (rsm == NULL) {
@@ -3475,10 +3688,24 @@
rsm->r_tim_lastsent[0] = ts;
rsm->r_rtr_cnt = 1;
rsm->r_rtr_bytes = 0;
- rsm->r_start = seq_out;
- rsm->r_end = rsm->r_start + len;
- rsm->r_sndcnt = 0;
- TAILQ_INSERT_TAIL(&rack->r_ctl.rc_map, rsm, r_next);
+ if (th_flags & TH_SYN) {
+ /* The data space is one beyond snd_una */
+ rsm->r_start = seq_out + 1;
+ rsm->r_end = rsm->r_start + (len - 1);
+ } else {
+ /* Normal case */
+ rsm->r_start = seq_out;
+ rsm->r_end = rsm->r_start + len;
+ }
+ rsm->r_dupack = 0;
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
+ }
+#endif
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
return;
@@ -3486,22 +3713,16 @@
/*
* If we reach here its a retransmission and we need to find it.
*/
+ memset(&fe, 0, sizeof(fe));
more:
if (hintrsm && (hintrsm->r_start == seq_out)) {
rsm = hintrsm;
hintrsm = NULL;
- } else if (rack->r_ctl.rc_next) {
- /* We have a hint from a previous run */
- rsm = rack->r_ctl.rc_next;
} else {
/* No hints sorry */
rsm = NULL;
}
if ((rsm) && (rsm->r_start == seq_out)) {
- /*
- * We used rc_next or hintrsm to retransmit, hopefully the
- * likely case.
- */
seq_out = rack_update_entry(tp, rack, rsm, ts, &len);
if (len == 0) {
return;
@@ -3510,14 +3731,16 @@
}
}
/* Ok it was not the last pointer go through it the hard way. */
- TAILQ_FOREACH(rsm, &rack->r_ctl.rc_map, r_next) {
+refind:
+ fe.r_start = seq_out;
+ rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
+ if (rsm) {
if (rsm->r_start == seq_out) {
seq_out = rack_update_entry(tp, rack, rsm, ts, &len);
- rack->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next);
if (len == 0) {
return;
} else {
- continue;
+ goto refind;
}
}
if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) {
@@ -3535,17 +3758,14 @@
* copy rsm to nrsm and then trim the front of rsm
* to not include this part.
*/
- nrsm->r_start = seq_out;
- nrsm->r_end = rsm->r_end;
- nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
- nrsm->r_flags = rsm->r_flags;
- nrsm->r_sndcnt = rsm->r_sndcnt;
- nrsm->r_rtr_bytes = 0;
- for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
- nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
+ rack_clone_rsm(rack, nrsm, rsm, seq_out);
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
}
- rsm->r_end = nrsm->r_start;
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next);
+#endif
if (rsm->r_in_tmap) {
TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
nrsm->r_in_tmap = 1;
@@ -3568,7 +3788,7 @@
printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n",
seq_out, len, tp->snd_una, tp->snd_max);
printf("Starting Dump of all rack entries\n");
- TAILQ_FOREACH(rsm, &rack->r_ctl.rc_map, r_next) {
+ RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
printf("rsm:%p start:%u end:%u\n",
rsm, rsm->r_start, rsm->r_end);
}
@@ -3799,7 +4019,7 @@
rack->r_ctl.rc_rack_min_rtt = 1;
}
}
- tcp_rack_xmit_timer(rack, TCP_TS_TO_TICKS(t) + 1);
+ tcp_rack_xmit_timer(rack, t + 1);
if ((rsm->r_flags & RACK_TLP) &&
(!IN_RECOVERY(tp->t_flags))) {
/* Segment was a TLP and our retrans matched */
@@ -3812,9 +4032,9 @@
* When we enter recovery we need to assure
* we send one packet.
*/
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
- } else
- rack->r_ctl.rc_tlp_rtx_out = 0;
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 7);
+ }
}
if (SEQ_LT(rack->r_ctl.rc_rack_tmit_time, rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)])) {
/* New more recent rack_tmit_time */
@@ -3833,7 +4053,7 @@
if ((to->to_flags & TOF_TS) &&
(ack_type == CUM_ACKED) &&
(to->to_tsecr) &&
- ((rsm->r_flags & (RACK_DEFERRED | RACK_OVERMAX)) == 0)) {
+ ((rsm->r_flags & RACK_OVERMAX) == 0)) {
/*
* Now which timestamp does it match? In this block the ACK
* must be coming from a previous transmission.
@@ -3930,11 +4150,7 @@
struct tcp_rack *rack, struct rack_sendmap *rsm)
{
struct rack_sendmap *nrsm;
- uint32_t ts;
- int32_t idx;
- idx = rsm->r_rtr_cnt - 1;
- ts = rsm->r_tim_lastsent[idx];
nrsm = rsm;
TAILQ_FOREACH_REVERSE_FROM(nrsm, &rack->r_ctl.rc_tmap,
rack_head, r_tnext) {
@@ -3943,7 +4159,11 @@
continue;
}
if (nrsm->r_flags & RACK_ACKED) {
- /* Skip ack'd segments */
+ /*
+ * Skip ack'd segments, though we
+ * should not see these, since tmap
+ * should not have ack'd segments.
+ */
continue;
}
if (nrsm->r_flags & RACK_SACK_PASSED) {
@@ -3954,146 +4174,219 @@
*/
break;
}
- idx = nrsm->r_rtr_cnt - 1;
- if (ts == nrsm->r_tim_lastsent[idx]) {
- /*
- * For this case lets use seq no, if we sent in a
- * big block (TSO) we would have a bunch of segments
- * sent at the same time.
- *
- * We would only get a report if its SEQ is earlier.
- * If we have done multiple retransmits the times
- * would not be equal.
- */
- if (SEQ_LT(nrsm->r_start, rsm->r_start)) {
- nrsm->r_flags |= RACK_SACK_PASSED;
- nrsm->r_flags &= ~RACK_WAS_SACKPASS;
- }
- } else {
- /*
- * Here they were sent at different times, not a big
- * block. Since we transmitted this one later and
- * see it sack'd then this must also be missing (or
- * we would have gotten a sack block for it)
- */
- nrsm->r_flags |= RACK_SACK_PASSED;
- nrsm->r_flags &= ~RACK_WAS_SACKPASS;
- }
+ nrsm->r_flags |= RACK_SACK_PASSED;
+ nrsm->r_flags &= ~RACK_WAS_SACKPASS;
}
}
static uint32_t
rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack, struct sackblk *sack,
- struct tcpopt *to, struct rack_sendmap **prsm, uint32_t cts)
+ struct tcpopt *to, struct rack_sendmap **prsm, uint32_t cts, int *moved_two)
{
- int32_t idx;
- int32_t times = 0;
uint32_t start, end, changed = 0;
- struct rack_sendmap *rsm, *nrsm;
+ struct rack_sendmap stack_map;
+ struct rack_sendmap *rsm, *nrsm, fe, *insret, *prev, *next;
int32_t used_ref = 1;
+ int moved = 0;
start = sack->start;
end = sack->end;
rsm = *prsm;
- if (rsm && SEQ_LT(start, rsm->r_start)) {
- TAILQ_FOREACH_REVERSE_FROM(rsm, &rack->r_ctl.rc_map, rack_head, r_next) {
- if (SEQ_GEQ(start, rsm->r_start) &&
- SEQ_LT(start, rsm->r_end)) {
- goto do_rest_ofb;
- }
- }
- }
- if (rsm == NULL) {
-start_at_beginning:
- rsm = NULL;
+ memset(&fe, 0, sizeof(fe));
+do_rest_ofb:
+ if ((rsm == NULL) ||
+ (SEQ_LT(end, rsm->r_start)) ||
+ (SEQ_GEQ(start, rsm->r_end)) ||
+ (SEQ_LT(start, rsm->r_start))) {
+ /*
+ * We are not in the right spot,
+ * find the correct spot in the tree.
+ */
used_ref = 0;
+ fe.r_start = start;
+ rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
+ moved++;
}
- /* First lets locate the block where this guy is */
- TAILQ_FOREACH_FROM(rsm, &rack->r_ctl.rc_map, r_next) {
- if (SEQ_GEQ(start, rsm->r_start) &&
- SEQ_LT(start, rsm->r_end)) {
- break;
- }
- }
-do_rest_ofb:
if (rsm == NULL) {
- /*
- * This happens when we get duplicate sack blocks with the
- * same end. For example SACK 4: 100 SACK 3: 100 The sort
- * will not change there location so we would just start at
- * the end of the first one and get lost.
- */
- if (tp->t_flags & TF_SENTFIN) {
- /*
- * Check to see if we have not logged the FIN that
- * went out.
+ /* TSNH */
+ goto out;
+ }
+ /* Ok we have an ACK for some piece of this rsm */
+ if (rsm->r_start != start) {
+ if ((rsm->r_flags & RACK_ACKED) == 0) {
+ /**
+ * Need to split this in two pieces the before and after,
+ * the before remains in the map, the after must be
+ * added. In other words we have:
+ * rsm |--------------|
+ * sackblk |------->
+ * rsm will become
+ * rsm |---|
+ * and nrsm will be the sacked piece
+ * nrsm |----------|
+ *
+ * But before we start down that path lets
+ * see if the sack spans over on top of
+ * the next guy and it is already sacked.
*/
- nrsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_map, rack_sendmap, r_next);
- if (nrsm && (nrsm->r_end + 1) == tp->snd_max) {
- /*
- * Ok we did not get the FIN logged.
+ next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ if (next && (next->r_flags & RACK_ACKED) &&
+ SEQ_GEQ(end, next->r_start)) {
+ /**
+ * So the next one is already acked, and
+ * we can thus by hookery use our stack_map
+ * to reflect the piece being sacked and
+ * then adjust the two tree entries moving
+ * the start and ends around. So we start like:
+ * rsm |------------| (not-acked)
+ * next |-----------| (acked)
+ * sackblk |-------->
+ * We want to end like so:
+ * rsm |------| (not-acked)
+ * next |-----------------| (acked)
+ * nrsm |-----|
+ * Where nrsm is a temporary stack piece we
+ * use to update all the gizmos.
*/
- nrsm->r_end++;
+ /* Copy up our fudge block */
+ nrsm = &stack_map;
+ memcpy(nrsm, rsm, sizeof(struct rack_sendmap));
+ /* Now adjust our tree blocks */
+ rsm->r_end = start;
+ next->r_start = start;
+ /* Clear out the dup ack count of the remainder */
+ rsm->r_dupack = 0;
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
+ /* Now lets make sure our fudge block is right */
+ nrsm->r_start = start;
+ /* Now lets update all the stats and such */
+ rack_update_rtt(tp, rack, nrsm, to, cts, SACKED);
+ changed += (nrsm->r_end - nrsm->r_start);
+ rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start);
+ if (nrsm->r_flags & RACK_SACK_PASSED) {
+ counter_u64_add(rack_reorder_seen, 1);
+ rack->r_ctl.rc_reorder_ts = cts;
+ }
+ /*
+ * Now we want to go up from rsm (the
+ * one left un-acked) to the next one
+ * in the tmap. We do this so when
+ * we walk backwards we include marking
+ * sack-passed on rsm (The one passed in
+ * is skipped since it is generally called
+ * on something sacked before removing it
+ * from the tmap).
+ */
+ if (rsm->r_in_tmap) {
+ nrsm = TAILQ_NEXT(rsm, r_tnext);
+ /*
+ * Now that we have the next
+ * one walk backwards from there.
+ */
+ if (nrsm && nrsm->r_in_tmap)
+ rack_log_sack_passed(tp, rack, nrsm);
+ }
+ /* Now are we done? */
+ if (SEQ_LT(end, next->r_end) ||
+ (end == next->r_end)) {
+ /* Done with block */
+ goto out;
+ }
+ counter_u64_add(rack_sack_used_next_merge, 1);
+ /* Postion for the next block */
+ start = next->r_end;
+ rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, next);
+ if (rsm == NULL)
+ goto out;
+ } else {
+ /**
+ * We can't use any hookery here, so we
+ * need to split the map. We enter like
+ * so:
+ * rsm |--------|
+ * sackblk |----->
+ * We will add the new block nrsm and
+ * that will be the new portion, and then
+ * fall through after reseting rsm. So we
+ * split and look like this:
+ * rsm |----|
+ * sackblk |----->
+ * nrsm |---|
+ * We then fall through reseting
+ * rsm to nrsm, so the next block
+ * picks it up.
+ */
+ nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
+ if (nrsm == NULL) {
+ /*
+ * failed XXXrrs what can we do but loose the sack
+ * info?
+ */
+ goto out;
+ }
+ counter_u64_add(rack_sack_splits, 1);
+ rack_clone_rsm(rack, nrsm, rsm, start);
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
+ }
+#endif
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ rsm->r_flags &= (~RACK_HAS_FIN);
+ /* Position us to point to the new nrsm that starts the sack blk */
rsm = nrsm;
- goto do_rest_ofb;
}
+ } else {
+ /* Already sacked this piece */
+ counter_u64_add(rack_sack_skipped_acked, 1);
+ moved++;
+ if (end == rsm->r_end) {
+ /* Done with block */
+ rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ goto out;
+ } else if (SEQ_LT(end, rsm->r_end)) {
+ /* A partial sack to a already sacked block */
+ moved++;
+ rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ goto out;
+ } else {
+ /*
+ * The end goes beyond this guy
+ * repostion the start to the
+ * next block.
+ */
+ start = rsm->r_end;
+ rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ if (rsm == NULL)
+ goto out;
+ }
}
- if (times == 1) {
-#ifdef INVARIANTS
- panic("tp:%p rack:%p sack:%p to:%p prsm:%p",
- tp, rack, sack, to, prsm);
-#else
- goto out;
-#endif
- }
- times++;
- counter_u64_add(rack_sack_proc_restart, 1);
- goto start_at_beginning;
}
- /* Ok we have an ACK for some piece of rsm */
- if (rsm->r_start != start) {
- /*
- * Need to split this in two pieces the before and after.
- */
- nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
- if (nrsm == NULL) {
- /*
- * failed XXXrrs what can we do but loose the sack
- * info?
- */
- goto out;
- }
- nrsm->r_start = start;
- nrsm->r_rtr_bytes = 0;
- nrsm->r_end = rsm->r_end;
- nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
- nrsm->r_flags = rsm->r_flags;
- nrsm->r_sndcnt = rsm->r_sndcnt;
- for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
- nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
- }
- rsm->r_end = nrsm->r_start;
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next);
- if (rsm->r_in_tmap) {
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
- nrsm->r_in_tmap = 1;
- }
- rsm->r_flags &= (~RACK_HAS_FIN);
- rsm = nrsm;
- }
if (SEQ_GEQ(end, rsm->r_end)) {
- /*
+ /**
* The end of this block is either beyond this guy or right
- * at this guy.
+ * at this guy. I.e.:
+ * rsm --- |-----|
+ * end |-----|
+ * <or>
+ * end |---------|
*/
-
+ if (rsm->r_flags & RACK_TLP)
+ rack->r_ctl.rc_tlp_rtx_out = 0;
if ((rsm->r_flags & RACK_ACKED) == 0) {
rack_update_rtt(tp, rack, rsm, to, cts, SACKED);
changed += (rsm->r_end - rsm->r_start);
rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
- rack_log_sack_passed(tp, rack, rsm);
+ if (rsm->r_in_tmap) /* should be true */
+ rack_log_sack_passed(tp, rack, rsm);
/* Is Reordering occuring? */
if (rsm->r_flags & RACK_SACK_PASSED) {
+ rsm->r_flags &= ~RACK_SACK_PASSED;
counter_u64_add(rack_reorder_seen, 1);
rack->r_ctl.rc_reorder_ts = cts;
}
@@ -4103,80 +4396,171 @@
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
+ } else {
+ counter_u64_add(rack_sack_skipped_acked, 1);
+ moved++;
}
if (end == rsm->r_end) {
- /* This block only - done */
+ /* This block only - done, setup for next */
goto out;
}
- /* There is more not coverend by this rsm move on */
+ /*
+ * There is more not coverend by this rsm move on
+ * to the next block in the RB tree.
+ */
+ nrsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
start = rsm->r_end;
- nrsm = TAILQ_NEXT(rsm, r_next);
rsm = nrsm;
- times = 0;
+ if (rsm == NULL)
+ goto out;
goto do_rest_ofb;
}
- /* Ok we need to split off this one at the tail */
- nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
- if (nrsm == NULL) {
- /* failed rrs what can we do but loose the sack info? */
- goto out;
+ /**
+ * The end of this sack block is smaller than
+ * our rsm i.e.:
+ * rsm --- |-----|
+ * end |--|
+ */
+ if ((rsm->r_flags & RACK_ACKED) == 0) {
+ prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ if (prev && (prev->r_flags & RACK_ACKED)) {
+ /**
+ * Goal, we want the right remainder of rsm to shrink
+ * in place and span from (rsm->r_start = end) to rsm->r_end.
+ * We want to expand prev to go all the way
+ * to prev->r_end <- end.
+ * so in the tree we have before:
+ * prev |--------| (acked)
+ * rsm |-------| (non-acked)
+ * sackblk |-|
+ * We churn it so we end up with
+ * prev |----------| (acked)
+ * rsm |-----| (non-acked)
+ * nrsm |-| (temporary)
+ */
+ nrsm = &stack_map;
+ memcpy(nrsm, rsm, sizeof(struct rack_sendmap));
+ prev->r_end = end;
+ rsm->r_start = end;
+ /* Now adjust nrsm (stack copy) to be
+ * the one that is the small
+ * piece that was "sacked".
+ */
+ nrsm->r_end = end;
+ rsm->r_dupack = 0;
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
+ /*
+ * Now nrsm is our new little piece
+ * that is acked (which was merged
+ * to prev). Update the rtt and changed
+ * based on that. Also check for reordering.
+ */
+ rack_update_rtt(tp, rack, nrsm, to, cts, SACKED);
+ changed += (nrsm->r_end - nrsm->r_start);
+ rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start);
+ if (nrsm->r_flags & RACK_SACK_PASSED) {
+ counter_u64_add(rack_reorder_seen, 1);
+ rack->r_ctl.rc_reorder_ts = cts;
+ }
+ rsm = prev;
+ counter_u64_add(rack_sack_used_prev_merge, 1);
+ } else {
+ /**
+ * This is the case where our previous
+ * block is not acked either, so we must
+ * split the block in two.
+ */
+ nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
+ if (nrsm == NULL) {
+ /* failed rrs what can we do but loose the sack info? */
+ goto out;
+ }
+ /**
+ * In this case nrsm becomes
+ * nrsm->r_start = end;
+ * nrsm->r_end = rsm->r_end;
+ * which is un-acked.
+ * <and>
+ * rsm->r_end = nrsm->r_start;
+ * i.e. the remaining un-acked
+ * piece is left on the left
+ * hand side.
+ *
+ * So we start like this
+ * rsm |----------| (not acked)
+ * sackblk |---|
+ * build it so we have
+ * rsm |---| (acked)
+ * nrsm |------| (not acked)
+ */
+ counter_u64_add(rack_sack_splits, 1);
+ rack_clone_rsm(rack, nrsm, rsm, end);
+ rsm->r_flags &= (~RACK_HAS_FIN);
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
+ }
+#endif
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ nrsm->r_dupack = 0;
+ rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2);
+ if (rsm->r_flags & RACK_TLP)
+ rack->r_ctl.rc_tlp_rtx_out = 0;
+ rack_update_rtt(tp, rack, rsm, to, cts, SACKED);
+ changed += (rsm->r_end - rsm->r_start);
+ rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
+ if (rsm->r_in_tmap) /* should be true */
+ rack_log_sack_passed(tp, rack, rsm);
+ /* Is Reordering occuring? */
+ if (rsm->r_flags & RACK_SACK_PASSED) {
+ rsm->r_flags &= ~RACK_SACK_PASSED;
+ counter_u64_add(rack_reorder_seen, 1);
+ rack->r_ctl.rc_reorder_ts = cts;
+ }
+ rsm->r_flags |= RACK_ACKED;
+ rsm->r_flags &= ~RACK_TLP;
+ if (rsm->r_in_tmap) {
+ TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
+ rsm->r_in_tmap = 0;
+ }
+ }
+ } else if (start != end){
+ /*
+ * The block was already acked.
+ */
+ counter_u64_add(rack_sack_skipped_acked, 1);
+ moved++;
}
- /* Clone it */
- nrsm->r_start = end;
- nrsm->r_end = rsm->r_end;
- nrsm->r_rtr_bytes = 0;
- nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
- nrsm->r_flags = rsm->r_flags;
- nrsm->r_sndcnt = rsm->r_sndcnt;
- for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
- nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
- }
- /* The sack block does not cover this guy fully */
- rsm->r_flags &= (~RACK_HAS_FIN);
- rsm->r_end = end;
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next);
- if (rsm->r_in_tmap) {
- TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
- nrsm->r_in_tmap = 1;
- }
- if (rsm->r_flags & RACK_ACKED) {
- /* Been here done that */
- goto out;
- }
- rack_update_rtt(tp, rack, rsm, to, cts, SACKED);
- changed += (rsm->r_end - rsm->r_start);
- rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
- rack_log_sack_passed(tp, rack, rsm);
- /* Is Reordering occuring? */
- if (rsm->r_flags & RACK_SACK_PASSED) {
- counter_u64_add(rack_reorder_seen, 1);
- rack->r_ctl.rc_reorder_ts = cts;
- }
- rsm->r_flags |= RACK_ACKED;
- rsm->r_flags &= ~RACK_TLP;
- if (rsm->r_in_tmap) {
- TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
- rsm->r_in_tmap = 0;
- }
out:
if (rsm && (rsm->r_flags & RACK_ACKED)) {
/*
- * Now can we merge this newly acked
- * block with either the previous or
+ * Now can we merge where we worked
+ * with either the previous or
* next block?
*/
- nrsm = TAILQ_NEXT(rsm, r_next);
- if (nrsm &&
- (nrsm->r_flags & RACK_ACKED)) {
+ next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ while (next) {
+ if (next->r_flags & RACK_ACKED) {
/* yep this and next can be merged */
- rsm = rack_merge_rsm(rack, rsm, nrsm);
+ rsm = rack_merge_rsm(rack, rsm, next);
+ next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ } else
+ break;
}
/* Now what about the previous? */
- nrsm = TAILQ_PREV(rsm, rack_head, r_next);
- if (nrsm &&
- (nrsm->r_flags & RACK_ACKED)) {
+ prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ while (prev) {
+ if (prev->r_flags & RACK_ACKED) {
/* yep the previous and this can be merged */
- rsm = rack_merge_rsm(rack, nrsm, rsm);
+ rsm = rack_merge_rsm(rack, prev, rsm);
+ prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ } else
+ break;
}
}
if (used_ref == 0) {
@@ -4184,12 +4568,14 @@
} else {
counter_u64_add(rack_sack_proc_short, 1);
}
- /* Save off where we last were */
- if (rsm)
- rack->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next);
+ /* Save off the next one for quick reference. */
+ if (rsm)
+ nrsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
else
- rack->r_ctl.rc_sacklast = NULL;
- *prsm = rsm;
+ nrsm = NULL;
+ *prsm = rack->r_ctl.rc_sacklast = nrsm;
+ /* Pass back the moved. */
+ *moved_two = moved;
return (changed);
}
@@ -4218,7 +4604,7 @@
tmap = rsm;
}
tmap->r_in_tmap = 1;
- rsm = TAILQ_NEXT(rsm, r_next);
+ rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
}
/*
* Now lets possibly clear the sack filter so we start
@@ -4230,16 +4616,72 @@
}
static void
+rack_do_decay(struct tcp_rack *rack)
+{
+ struct timeval res;
+
+#define timersub(tvp, uvp, vvp) \
+ do { \
+ (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
+ (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
+ if ((vvp)->tv_usec < 0) { \
+ (vvp)->tv_sec--; \
+ (vvp)->tv_usec += 1000000; \
+ } \
+ } while (0)
+
+ timersub(&rack->r_ctl.rc_last_ack, &rack->r_ctl.rc_last_time_decay, &res);
+#undef timersub
+
+ rack->r_ctl.input_pkt++;
+ if ((rack->rc_in_persist) ||
+ (res.tv_sec >= 1) ||
+ (rack->rc_tp->snd_max == rack->rc_tp->snd_una)) {
+ /*
+ * Check for decay of non-SAD,
+ * we want all SAD detection metrics to
+ * decay 1/4 per second (or more) passed.
+ */
+ uint32_t pkt_delta;
+
+ pkt_delta = rack->r_ctl.input_pkt - rack->r_ctl.saved_input_pkt;
+ /* Update our saved tracking values */
+ rack->r_ctl.saved_input_pkt = rack->r_ctl.input_pkt;
+ rack->r_ctl.rc_last_time_decay = rack->r_ctl.rc_last_ack;
+ /* Now do we escape without decay? */
+ if (rack->rc_in_persist ||
+ (rack->rc_tp->snd_max == rack->rc_tp->snd_una) ||
+ (pkt_delta < tcp_sad_low_pps)){
+ /*
+ * We don't decay idle connections
+ * or ones that have a low input pps.
+ */
+ return;
+ }
+ /* Decay the counters */
+ rack->r_ctl.ack_count = ctf_decay_count(rack->r_ctl.ack_count,
+ tcp_sad_decay_val);
+ rack->r_ctl.sack_count = ctf_decay_count(rack->r_ctl.sack_count,
+ tcp_sad_decay_val);
+ rack->r_ctl.sack_moved_extra = ctf_decay_count(rack->r_ctl.sack_moved_extra,
+ tcp_sad_decay_val);
+ rack->r_ctl.sack_noextra_move = ctf_decay_count(rack->r_ctl.sack_noextra_move,
+ tcp_sad_decay_val);
+ }
+}
+
+static void
rack_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th)
{
- uint32_t changed, last_seq, entered_recovery = 0;
+ uint32_t changed, entered_recovery = 0;
struct tcp_rack *rack;
- struct rack_sendmap *rsm;
+ struct rack_sendmap *rsm, *rm;
struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1];
register uint32_t th_ack;
int32_t i, j, k, num_sack_blks = 0;
uint32_t cts, acked, ack_point, sack_changed = 0;
-
+ int loop_start = 0, moved_two = 0;
+
INP_WLOCK_ASSERT(tp->t_inpcb);
if (th->th_flags & TH_RST) {
/* We don't log resets */
@@ -4247,10 +4689,31 @@
}
rack = (struct tcp_rack *)tp->t_fb_ptr;
cts = tcp_ts_getticks();
- rsm = TAILQ_FIRST(&rack->r_ctl.rc_map);
+ rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
changed = 0;
th_ack = th->th_ack;
+ if (rack->sack_attack_disable == 0)
+ rack_do_decay(rack);
+ if (BYTES_THIS_ACK(tp, th) >= ctf_fixed_maxseg(rack->rc_tp)) {
+ /*
+ * You only get credit for
+ * MSS and greater (and you get extra
+ * credit for larger cum-ack moves).
+ */
+ int ac;
+ ac = BYTES_THIS_ACK(tp, th) / ctf_fixed_maxseg(rack->rc_tp);
+ rack->r_ctl.ack_count += ac;
+ counter_u64_add(rack_ack_total, ac);
+ }
+ if (rack->r_ctl.ack_count > 0xfff00000) {
+ /*
+ * reduce the number to keep us under
+ * a uint32_t.
+ */
+ rack->r_ctl.ack_count /= 2;
+ rack->r_ctl.sack_count /= 2;
+ }
if (SEQ_GT(th_ack, tp->snd_una)) {
rack_log_progress_event(rack, tp, ticks, PROGRESS_UPDATE, __LINE__);
tp->t_acktime = ticks;
@@ -4264,8 +4727,8 @@
* RTT's.
*/
rack->r_wanted_output++;
-more:
- rsm = TAILQ_FIRST(&rack->r_ctl.rc_map);
+ more:
+ rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
if (rsm == NULL) {
if ((th_ack - 1) == tp->iss) {
/*
@@ -4282,9 +4745,9 @@
}
#ifdef INVARIANTS
panic("No rack map tp:%p for th:%p state:%d rack:%p snd_una:%u snd_max:%u snd_nxt:%u chg:%d\n",
- tp,
- th, tp->t_state, rack,
- tp->snd_una, tp->snd_max, tp->snd_nxt, changed);
+ tp,
+ th, tp->t_state, rack,
+ tp->snd_una, tp->snd_max, tp->snd_nxt, changed);
#endif
goto proc_sack;
}
@@ -4292,8 +4755,8 @@
/* Huh map is missing this */
#ifdef INVARIANTS
printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d\n",
- rsm->r_start,
- th_ack, tp->t_state, rack->r_state);
+ rsm->r_start,
+ th_ack, tp->t_state, rack->r_state);
#endif
goto proc_sack;
}
@@ -4305,15 +4768,19 @@
rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
rsm->r_rtr_bytes = 0;
- TAILQ_REMOVE(&rack->r_ctl.rc_map, rsm, r_next);
+ if (rsm->r_flags & RACK_TLP)
+ rack->r_ctl.rc_tlp_rtx_out = 0;
+ rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+#ifdef INVARIANTS
+ if (rm != rsm) {
+ panic("removing head in rack:%p rsm:%p rm:%p",
+ rack, rsm, rm);
+ }
+#endif
if (rsm->r_in_tmap) {
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
- if (rack->r_ctl.rc_next == rsm) {
- /* scoot along the marker */
- rack->r_ctl.rc_next = TAILQ_FIRST(&rack->r_ctl.rc_map);
- }
if (rsm->r_flags & RACK_ACKED) {
/*
* It was acked on the scoreboard -- remove
@@ -4322,10 +4789,11 @@
rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
} else if (rsm->r_flags & RACK_SACK_PASSED) {
/*
- * There are acked segments ACKED on the
+ * There are segments ACKED on the
* scoreboard further up. We are seeing
* reordering.
*/
+ rsm->r_flags &= ~RACK_SACK_PASSED;
counter_u64_add(rack_reorder_seen, 1);
rsm->r_flags |= RACK_ACKED;
rack->r_ctl.rc_reorder_ts = cts;
@@ -4357,13 +4825,31 @@
*/
rack->r_ctl.rc_sacked -= (th_ack - rsm->r_start);
}
- rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
- rsm->r_rtr_bytes = 0;
+ /*
+ * Clear the dup ack count for
+ * the piece that remains.
+ */
+ rsm->r_dupack = 0;
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
+ if (rsm->r_rtr_bytes) {
+ /*
+ * It was retransmitted adjust the
+ * sack holes for what was acked.
+ */
+ int ack_am;
+
+ ack_am = (th_ack - rsm->r_start);
+ if (ack_am >= rsm->r_rtr_bytes) {
+ rack->r_ctl.rc_holes_rxt -= ack_am;
+ rsm->r_rtr_bytes -= ack_am;
+ }
+ }
+ /* Update where the piece starts */
rsm->r_start = th_ack;
}
proc_sack:
/* Check for reneging */
- rsm = TAILQ_FIRST(&rack->r_ctl.rc_map);
+ rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
if (rsm && (rsm->r_flags & RACK_ACKED) && (th_ack == rsm->r_start)) {
/*
* The peer has moved snd_una up to
@@ -4382,15 +4868,9 @@
rack_peer_reneges(rack, rsm, th->th_ack);
}
if ((to->to_flags & TOF_SACK) == 0) {
- /* We are done nothing left to log */
+ /* We are done nothing left */
goto out;
}
- rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_map, rack_sendmap, r_next);
- if (rsm) {
- last_seq = rsm->r_end;
- } else {
- last_seq = tp->snd_max;
- }
/* Sack block processing */
if (SEQ_GT(th_ack, tp->snd_una))
ack_point = th_ack;
@@ -4398,7 +4878,7 @@
ack_point = tp->snd_una;
for (i = 0; i < to->to_nsacks; i++) {
bcopy((to->to_sacks + i * TCPOLEN_SACK),
- &sack, sizeof(sack));
+ &sack, sizeof(sack));
sack.start = ntohl(sack.start);
sack.end = ntohl(sack.end);
if (SEQ_GT(sack.end, sack.start) &&
@@ -4406,28 +4886,19 @@
SEQ_LT(sack.start, tp->snd_max) &&
SEQ_GT(sack.end, ack_point) &&
SEQ_LEQ(sack.end, tp->snd_max)) {
- if ((rack->r_ctl.rc_num_maps_alloced > rack_sack_block_limit) &&
- (SEQ_LT(sack.end, last_seq)) &&
- ((sack.end - sack.start) < (tp->t_maxseg / 8))) {
- /*
- * Not the last piece and its smaller than
- * 1/8th of a MSS. We ignore this.
- */
- counter_u64_add(rack_runt_sacks, 1);
- continue;
- }
sack_blocks[num_sack_blks] = sack;
num_sack_blks++;
+#ifdef NETFLIX_STATS
} else if (SEQ_LEQ(sack.start, th_ack) &&
SEQ_LEQ(sack.end, th_ack)) {
/*
* Its a D-SACK block.
*/
-/* tcp_record_dsack(sack.start, sack.end); */
+ tcp_record_dsack(sack.start, sack.end);
+#endif
}
+
}
- if (num_sack_blks == 0)
- goto out;
/*
* Sort the SACK blocks so we can update the rack scoreboard with
* just one pass.
@@ -4437,7 +4908,12 @@
num_sack_blks, th->th_ack);
ctf_log_sack_filter(rack->rc_tp, num_sack_blks, sack_blocks);
}
+ if (num_sack_blks == 0) {
+ /* Nothing to sack (DSACKs?) */
+ goto out_with_totals;
+ }
if (num_sack_blks < 2) {
+ /* Only one, we don't need to sort */
goto do_sack_work;
}
/* Sort the sacks */
@@ -4452,9 +4928,11 @@
}
/*
* Now are any of the sack block ends the same (yes some
- * implememtations send these)?
+ * implementations send these)?
*/
again:
+ if (num_sack_blks == 0)
+ goto out_with_totals;
if (num_sack_blks > 1) {
for (i = 0; i < num_sack_blks; i++) {
for (j = i + 1; j < num_sack_blks; j++) {
@@ -4488,16 +4966,230 @@
}
}
do_sack_work:
+ /*
+ * First lets look to see if
+ * we have retransmitted and
+ * can use the transmit next?
+ */
+ rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
+ if (rsm &&
+ SEQ_GT(sack_blocks[0].end, rsm->r_start) &&
+ SEQ_LT(sack_blocks[0].start, rsm->r_end)) {
+ /*
+ * We probably did the FR and the next
+ * SACK in continues as we would expect.
+ */
+ acked = rack_proc_sack_blk(tp, rack, &sack_blocks[0], to, &rsm, cts, &moved_two);
+ if (acked) {
+ rack->r_wanted_output++;
+ changed += acked;
+ sack_changed += acked;
+ }
+ if (num_sack_blks == 1) {
+ /*
+ * This is what we would expect from
+ * a normal implementation to happen
+ * after we have retransmitted the FR,
+ * i.e the sack-filter pushes down
+ * to 1 block and the next to be retransmitted
+ * is the sequence in the sack block (has more
+ * are acked). Count this as ACK'd data to boost
+ * up the chances of recovering any false positives.
+ */
+ rack->r_ctl.ack_count += (acked / ctf_fixed_maxseg(rack->rc_tp));
+ counter_u64_add(rack_ack_total, (acked / ctf_fixed_maxseg(rack->rc_tp)));
+ counter_u64_add(rack_express_sack, 1);
+ if (rack->r_ctl.ack_count > 0xfff00000) {
+ /*
+ * reduce the number to keep us under
+ * a uint32_t.
+ */
+ rack->r_ctl.ack_count /= 2;
+ rack->r_ctl.sack_count /= 2;
+ }
+ goto out_with_totals;
+ } else {
+ /*
+ * Start the loop through the
+ * rest of blocks, past the first block.
+ */
+ moved_two = 0;
+ loop_start = 1;
+ }
+ }
+ /* Its a sack of some sort */
+ rack->r_ctl.sack_count++;
+ if (rack->r_ctl.sack_count > 0xfff00000) {
+ /*
+ * reduce the number to keep us under
+ * a uint32_t.
+ */
+ rack->r_ctl.ack_count /= 2;
+ rack->r_ctl.sack_count /= 2;
+ }
+ counter_u64_add(rack_sack_total, 1);
+ if (rack->sack_attack_disable) {
+ /* An attacker disablement is in place */
+ if (num_sack_blks > 1) {
+ rack->r_ctl.sack_count += (num_sack_blks - 1);
+ rack->r_ctl.sack_moved_extra++;
+ counter_u64_add(rack_move_some, 1);
+ if (rack->r_ctl.sack_moved_extra > 0xfff00000) {
+ rack->r_ctl.sack_moved_extra /= 2;
+ rack->r_ctl.sack_noextra_move /= 2;
+ }
+ }
+ goto out;
+ }
rsm = rack->r_ctl.rc_sacklast;
- for (i = 0; i < num_sack_blks; i++) {
- acked = rack_proc_sack_blk(tp, rack, &sack_blocks[i], to, &rsm, cts);
+ for (i = loop_start; i < num_sack_blks; i++) {
+ acked = rack_proc_sack_blk(tp, rack, &sack_blocks[i], to, &rsm, cts, &moved_two);
if (acked) {
rack->r_wanted_output++;
changed += acked;
sack_changed += acked;
}
+ if (moved_two) {
+ /*
+ * If we did not get a SACK for at least a MSS and
+ * had to move at all, or if we moved more than our
+ * threshold, it counts against the "extra" move.
+ */
+ rack->r_ctl.sack_moved_extra += moved_two;
+ counter_u64_add(rack_move_some, 1);
+ } else {
+ /*
+ * else we did not have to move
+ * any more than we would expect.
+ */
+ rack->r_ctl.sack_noextra_move++;
+ counter_u64_add(rack_move_none, 1);
+ }
+ if (moved_two && (acked < ctf_fixed_maxseg(rack->rc_tp))) {
+ /*
+ * If the SACK was not a full MSS then
+ * we add to sack_count the number of
+ * MSS's (or possibly more than
+ * a MSS if its a TSO send) we had to skip by.
+ */
+ rack->r_ctl.sack_count += moved_two;
+ counter_u64_add(rack_sack_total, moved_two);
+ }
+ /*
+ * Now we need to setup for the next
+ * round. First we make sure we won't
+ * exceed the size of our uint32_t on
+ * the various counts, and then clear out
+ * moved_two.
+ */
+ if ((rack->r_ctl.sack_moved_extra > 0xfff00000) ||
+ (rack->r_ctl.sack_noextra_move > 0xfff00000)) {
+ rack->r_ctl.sack_moved_extra /= 2;
+ rack->r_ctl.sack_noextra_move /= 2;
+ }
+ if (rack->r_ctl.sack_count > 0xfff00000) {
+ rack->r_ctl.ack_count /= 2;
+ rack->r_ctl.sack_count /= 2;
+ }
+ moved_two = 0;
}
+out_with_totals:
+ if (num_sack_blks > 1) {
+ /*
+ * You get an extra stroke if
+ * you have more than one sack-blk, this
+ * could be where we are skipping forward
+ * and the sack-filter is still working, or
+ * it could be an attacker constantly
+ * moving us.
+ */
+ rack->r_ctl.sack_moved_extra++;
+ counter_u64_add(rack_move_some, 1);
+ }
out:
+#ifdef NETFLIX_EXP_DETECTION
+ if ((rack->do_detection || tcp_force_detection) &&
+ tcp_sack_to_ack_thresh &&
+ tcp_sack_to_move_thresh &&
+ ((rack->r_ctl.rc_num_maps_alloced > tcp_map_minimum) || rack->sack_attack_disable)) {
+ /*
+ * We have thresholds set to find
+ * possible attackers and disable sack.
+ * Check them.
+ */
+ uint64_t ackratio, moveratio, movetotal;
+
+ /* Log detecting */
+ rack_log_sad(rack, 1);
+ ackratio = (uint64_t)(rack->r_ctl.sack_count);
+ ackratio *= (uint64_t)(1000);
+ if (rack->r_ctl.ack_count)
+ ackratio /= (uint64_t)(rack->r_ctl.ack_count);
+ else {
+ /* We really should not hit here */
+ ackratio = 1000;
+ }
+ if ((rack->sack_attack_disable == 0) &&
+ (ackratio > rack_highest_sack_thresh_seen))
+ rack_highest_sack_thresh_seen = (uint32_t)ackratio;
+ movetotal = rack->r_ctl.sack_moved_extra;
+ movetotal += rack->r_ctl.sack_noextra_move;
+ moveratio = rack->r_ctl.sack_moved_extra;
+ moveratio *= (uint64_t)1000;
+ if (movetotal)
+ moveratio /= movetotal;
+ else {
+ /* No moves, thats pretty good */
+ moveratio = 0;
+ }
+ if ((rack->sack_attack_disable == 0) &&
+ (moveratio > rack_highest_move_thresh_seen))
+ rack_highest_move_thresh_seen = (uint32_t)moveratio;
+ if (rack->sack_attack_disable == 0) {
+ if ((ackratio > tcp_sack_to_ack_thresh) &&
+ (moveratio > tcp_sack_to_move_thresh)) {
+ /* Disable sack processing */
+ rack->sack_attack_disable = 1;
+ if (rack->r_rep_attack == 0) {
+ rack->r_rep_attack = 1;
+ counter_u64_add(rack_sack_attacks_detected, 1);
+ }
+ if (tcp_attack_on_turns_on_logging) {
+ /*
+ * Turn on logging, used for debugging
+ * false positives.
+ */
+ rack->rc_tp->t_logstate = tcp_attack_on_turns_on_logging;
+ }
+ /* Clamp the cwnd at flight size */
+ rack->r_ctl.rc_saved_cwnd = rack->rc_tp->snd_cwnd;
+ rack->rc_tp->snd_cwnd = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ rack_log_sad(rack, 2);
+ }
+ } else {
+ /* We are sack-disabled check for false positives */
+ if ((ackratio <= tcp_restoral_thresh) ||
+ (rack->r_ctl.rc_num_maps_alloced < tcp_map_minimum)) {
+ rack->sack_attack_disable = 0;
+ rack_log_sad(rack, 3);
+ /* Restart counting */
+ rack->r_ctl.sack_count = 0;
+ rack->r_ctl.sack_moved_extra = 0;
+ rack->r_ctl.sack_noextra_move = 1;
+ rack->r_ctl.ack_count = max(1,
+ (BYTES_THIS_ACK(tp, th)/ctf_fixed_maxseg(rack->rc_tp)));
+
+ if (rack->r_rep_reverse == 0) {
+ rack->r_rep_reverse = 1;
+ counter_u64_add(rack_sack_attacks_reversed, 1);
+ }
+ /* Restore the cwnd */
+ if (rack->r_ctl.rc_saved_cwnd > rack->rc_tp->snd_cwnd)
+ rack->rc_tp->snd_cwnd = rack->r_ctl.rc_saved_cwnd;
+ }
+ }
+ }
+#endif
if (changed) {
/* Something changed cancel the rack timer */
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
@@ -4523,12 +5215,13 @@
* When we enter recovery we need to assure we send
* one packet.
*/
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 8);
rack->r_timer_override = 1;
}
}
if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) {
- /* Deal with changed an PRR here (in recovery only) */
+ /* Deal with changed and PRR here (in recovery only) */
uint32_t pipe, snd_una;
rack->r_ctl.rc_prr_delivered += changed;
@@ -4547,6 +5240,7 @@
sndcnt /= (long)rack->r_ctl.rc_prr_recovery_fs;
else {
rack->r_ctl.rc_prr_sndcnt = 0;
+ rack_log_to_prr(rack, 9);
sndcnt = 0;
}
sndcnt++;
@@ -4555,6 +5249,7 @@
else
sndcnt = 0;
rack->r_ctl.rc_prr_sndcnt = sndcnt;
+ rack_log_to_prr(rack, 10);
} else {
uint32_t limit;
@@ -4564,19 +5259,38 @@
limit = 0;
if (changed > limit)
limit = changed;
- limit += tp->t_maxseg;
+ limit += ctf_fixed_maxseg(tp);
if (tp->snd_ssthresh > pipe) {
rack->r_ctl.rc_prr_sndcnt = min((tp->snd_ssthresh - pipe), limit);
+ rack_log_to_prr(rack, 11);
} else {
rack->r_ctl.rc_prr_sndcnt = min(0, limit);
+ rack_log_to_prr(rack, 12);
}
}
- if (rack->r_ctl.rc_prr_sndcnt >= tp->t_maxseg) {
+ if (rack->r_ctl.rc_prr_sndcnt >= ctf_fixed_maxseg(tp)) {
rack->r_timer_override = 1;
}
}
}
+static void
+rack_strike_dupack(struct tcp_rack *rack)
+{
+ struct rack_sendmap *rsm;
+
+ rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
+ if (rsm && (rsm->r_dupack < 0xff)) {
+ rsm->r_dupack++;
+ if (rsm->r_dupack >= DUP_ACK_THRESHOLD) {
+ rack->r_wanted_output = 1;
+ rack_log_retran_reason(rack, rsm, __LINE__, 1, 3);
+ } else {
+ rack_log_retran_reason(rack, rsm, __LINE__, 0, 3);
+ }
+ }
+}
+
/*
* Return value of 1, we do not need to call rack_process_data().
* return value of 0, rack_process_data can be called.
@@ -4598,10 +5312,15 @@
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (SEQ_GT(th->th_ack, tp->snd_max)) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
+ rack->r_wanted_output++;
return (1);
}
if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) {
+ if (rack->rc_in_persist)
+ tp->t_rxtshift = 0;
+ if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd))
+ rack_strike_dupack(rack);
rack_log_ack(tp, to, th);
}
if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
@@ -4675,9 +5394,6 @@
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
rack->r_wanted_output++;
}
- /*
- * If no data (only SYN) was ACK'd, skip rest of ACK processing.
- */
if (acked == 0) {
if (ofia)
*ofia = ourfinisacked;
@@ -4732,7 +5448,8 @@
if (tp->snd_una == tp->snd_max) {
/* Nothing left outstanding */
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
- tp->t_acktime = 0;
+ if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0)
+ tp->t_acktime = 0;
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
/* Set need output so persist might get set */
rack->r_wanted_output++;
@@ -4748,7 +5465,7 @@
*/
*ret_val = 1;
tp = tcp_close(tp);
- rack_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen);
return (1);
}
}
@@ -4757,7 +5474,92 @@
return (0);
}
+static void
+rack_collapsed_window(struct tcp_rack *rack)
+{
+ /*
+ * Now we must walk the
+ * send map and divide the
+ * ones left stranded. These
+ * guys can't cause us to abort
+ * the connection and are really
+ * "unsent". However if a buggy
+ * client actually did keep some
+ * of the data i.e. collapsed the win
+ * and refused to ack and then opened
+ * the win and acked that data. We would
+ * get into an ack war, the simplier
+ * method then of just pretending we
+ * did not send those segments something
+ * won't work.
+ */
+ struct rack_sendmap *rsm, *nrsm, fe, *insret;
+ tcp_seq max_seq;
+ uint32_t maxseg;
+ max_seq = rack->rc_tp->snd_una + rack->rc_tp->snd_wnd;
+ maxseg = ctf_fixed_maxseg(rack->rc_tp);
+ memset(&fe, 0, sizeof(fe));
+ fe.r_start = max_seq;
+ /* Find the first seq past or at maxseq */
+ rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
+ if (rsm == NULL) {
+ /* Nothing to do strange */
+ rack->rc_has_collapsed = 0;
+ return;
+ }
+ /*
+ * Now do we need to split at
+ * the collapse point?
+ */
+ if (SEQ_GT(max_seq, rsm->r_start)) {
+ nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
+ if (nrsm == NULL) {
+ /* We can't get a rsm, mark all? */
+ nrsm = rsm;
+ goto no_split;
+ }
+ /* Clone it */
+ rack_clone_rsm(rack, nrsm, rsm, max_seq);
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
+ nrsm, insret, rack, rsm);
+ }
+#endif
+ if (rsm->r_in_tmap) {
+ TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
+ nrsm->r_in_tmap = 1;
+ }
+ /*
+ * Set in the new RSM as the
+ * collapsed starting point
+ */
+ rsm = nrsm;
+ }
+no_split:
+ counter_u64_add(rack_collapsed_win, 1);
+ RB_FOREACH_FROM(nrsm, rack_rb_tree_head, rsm) {
+ nrsm->r_flags |= RACK_RWND_COLLAPSED;
+ rack->rc_has_collapsed = 1;
+ }
+}
+
+static void
+rack_un_collapse_window(struct tcp_rack *rack)
+{
+ struct rack_sendmap *rsm;
+
+ RB_FOREACH_REVERSE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
+ if (rsm->r_flags & RACK_RWND_COLLAPSED)
+ rsm->r_flags &= ~RACK_RWND_COLLAPSED;
+ else
+ break;
+ }
+ rack->rc_has_collapsed = 0;
+}
+
/*
* Return value of 1, the TCB is unlocked and most
* likely gone, return value of 0, the TCP is still
@@ -4773,11 +5575,7 @@
* send garbage on first SYN.
*/
int32_t nsegs;
-#ifdef TCP_RFC7413
int32_t tfo_syn;
-#else
-#define tfo_syn (FALSE)
-#endif
struct tcp_rack *rack;
rack = (struct tcp_rack *)tp->t_fb_ptr;
@@ -4804,13 +5602,36 @@
tp->snd_wl2 = th->th_ack;
}
}
+ if (tp->snd_wnd < ctf_outstanding(tp))
+ /* The peer collapsed the window */
+ rack_collapsed_window(rack);
+ else if (rack->rc_has_collapsed)
+ rack_un_collapse_window(rack);
/* Was persist timer active and now we have window space? */
- if ((rack->rc_in_persist != 0) && tp->snd_wnd) {
+ if ((rack->rc_in_persist != 0) &&
+ (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
+ rack->r_ctl.rc_pace_min_segs))) {
rack_exit_persist(tp, rack);
tp->snd_nxt = tp->snd_max;
/* Make sure we output to start the timer */
rack->r_wanted_output++;
}
+ /* Do we enter persists? */
+ if ((rack->rc_in_persist == 0) &&
+ (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
+ TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->snd_max == tp->snd_una) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd) &&
+ (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) {
+ /*
+ * Here the rwnd is less than
+ * the pacing size, we are established,
+ * nothing is outstanding, and there is
+ * data to send. Enter persists.
+ */
+ tp->snd_nxt = tp->snd_una;
+ rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
+ }
if (tp->t_flags2 & TF2_DROP_AF_DATA) {
m_freem(m);
return (0);
@@ -4886,10 +5707,8 @@
* PRU_RCVD). If a FIN has already been received on this connection
* then we just ignore the text.
*/
-#ifdef TCP_RFC7413
tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) &&
- (tp->t_flags & TF_FASTOPEN));
-#endif
+ IS_FASTOPEN(tp->t_flags));
if ((tlen || (thflags & TH_FIN) || tfo_syn) &&
TCPS_HAVERCVDFIN(tp->t_state) == 0) {
tcp_seq save_start = th->th_seq;
@@ -4912,6 +5731,20 @@
SEGQ_EMPTY(tp) &&
(TCPS_HAVEESTABLISHED(tp->t_state) ||
tfo_syn)) {
+#ifdef NETFLIX_SB_LIMITS
+ u_int mcnt, appended;
+
+ if (so->so_rcv.sb_shlim) {
+ mcnt = m_memcnt(m);
+ appended = 0;
+ if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
+ CFO_NOSLEEP, NULL) == false) {
+ counter_u64_add(tcp_sb_shlim_fails, 1);
+ m_freem(m);
+ return (0);
+ }
+ }
+#endif
if (DELAY_ACK(tp, tlen) || tfo_syn) {
rack_timer_cancel(tp, rack,
rack->r_ctl.rc_rcvtime, __LINE__);
@@ -4925,12 +5758,20 @@
TCPSTAT_ADD(tcps_rcvpack, nsegs);
TCPSTAT_ADD(tcps_rcvbyte, tlen);
SOCKBUF_LOCK(&so->so_rcv);
- if (so->so_rcv.sb_state & SBS_CANTRCVMORE)
+ if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
m_freem(m);
- else
- sbappendstream_locked(&so->so_rcv, m, 0);
+ } else
+#ifdef NETFLIX_SB_LIMITS
+ appended =
+#endif
+ sbappendstream_locked(&so->so_rcv, m, 0);
/* NB: sorwakeup_locked() does an implicit unlock. */
sorwakeup_locked(so);
+#ifdef NETFLIX_SB_LIMITS
+ if (so->so_rcv.sb_shlim && appended != mcnt)
+ counter_fo_release(so->so_rcv.sb_shlim,
+ mcnt - appended);
+#endif
} else {
/*
* XXX: Due to the header drop above "th" is
@@ -5063,6 +5904,9 @@
int32_t nsegs;
int32_t newsize = 0; /* automatic sockbuf scaling */
struct tcp_rack *rack;
+#ifdef NETFLIX_SB_LIMITS
+ u_int mcnt, appended;
+#endif
#ifdef TCPDEBUG
/*
* The size of tcp_saveipgen must be the size of the max ip header,
@@ -5112,10 +5956,21 @@
*/
nsegs = max(1, m->m_pkthdr.lro_nsegs);
-
+#ifdef NETFLIX_SB_LIMITS
+ if (so->so_rcv.sb_shlim) {
+ mcnt = m_memcnt(m);
+ appended = 0;
+ if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
+ CFO_NOSLEEP, NULL) == false) {
+ counter_u64_add(tcp_sb_shlim_fails, 1);
+ m_freem(m);
+ return (1);
+ }
+ }
+#endif
/* Clean receiver SACK report if present */
if (tp->rcv_numsacks)
- tcp_clean_sackreport(tp);
+ tcp_clean_sackreport(tp);
TCPSTAT_INC(tcps_preddat);
tp->rcv_nxt += tlen;
/*
@@ -5149,11 +6004,18 @@
newsize, so, NULL))
so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
m_adj(m, drop_hdrlen); /* delayed header drop */
- sbappendstream_locked(&so->so_rcv, m, 0);
- rack_calc_rwin(so, tp);
+#ifdef NETFLIX_SB_LIMITS
+ appended =
+#endif
+ sbappendstream_locked(&so->so_rcv, m, 0);
+ ctf_calc_rwin(so, tp);
}
/* NB: sorwakeup_locked() does an implicit unlock. */
sorwakeup_locked(so);
+#ifdef NETFLIX_SB_LIMITS
+ if (so->so_rcv.sb_shlim && mcnt != appended)
+ counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended);
+#endif
if (DELAY_ACK(tp, tlen)) {
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
tp->t_flags |= TF_DELACK;
@@ -5231,6 +6093,12 @@
/* Ok if we reach here, we can process a fast-ack */
nsegs = max(1, m->m_pkthdr.lro_nsegs);
rack_log_ack(tp, to, th);
+ /*
+ * We made progress, clear the tlp
+ * out flag so we could start a TLP
+ * again.
+ */
+ rack->r_ctl.rc_tlp_rtx_out = 0;
/* Did the window get updated? */
if (tiwin != tp->snd_wnd) {
tp->snd_wnd = tiwin;
@@ -5238,9 +6106,28 @@
if (tp->snd_wnd > tp->max_sndwnd)
tp->max_sndwnd = tp->snd_wnd;
}
- if ((rack->rc_in_persist != 0) && (tp->snd_wnd >= tp->t_maxseg)) {
+ /* Do we exit persists? */
+ if ((rack->rc_in_persist != 0) &&
+ (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
+ rack->r_ctl.rc_pace_min_segs))) {
rack_exit_persist(tp, rack);
}
+ /* Do we enter persists? */
+ if ((rack->rc_in_persist == 0) &&
+ (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
+ TCPS_HAVEESTABLISHED(tp->t_state) &&
+ (tp->snd_max == tp->snd_una) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd) &&
+ (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) {
+ /*
+ * Here the rwnd is less than
+ * the pacing size, we are established,
+ * nothing is outstanding, and there is
+ * data to send. Enter persists.
+ */
+ tp->snd_nxt = tp->snd_una;
+ rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
+ }
/*
* If last ACK falls within this segment's sequence numbers, record
* the timestamp. NOTE that the test is modified according to the
@@ -5290,6 +6177,12 @@
rack_ack_received(tp, rack, th, nsegs, CC_ACK, 0);
tp->snd_una = th->th_ack;
+ if (tp->snd_wnd < ctf_outstanding(tp)) {
+ /* The peer collapsed the window */
+ rack_collapsed_window(rack);
+ } else if (rack->rc_has_collapsed)
+ rack_un_collapse_window(rack);
+
/*
* Pull snd_wl2 up to prevent seq wrap relative to th_ack.
*/
@@ -5313,7 +6206,8 @@
#endif
if (tp->snd_una == tp->snd_max) {
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
- tp->t_acktime = 0;
+ if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0)
+ tp->t_acktime = 0;
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
}
/* Wake up the socket if we have room to write more */
@@ -5337,8 +6231,9 @@
int32_t ret_val = 0;
int32_t todrop;
int32_t ourfinisacked = 0;
+ struct tcp_rack *rack;
- rack_calc_rwin(so, tp);
+ ctf_calc_rwin(so, tp);
/*
* If the state is SYN_SENT: if seg contains an ACK, but not for our
* SYN, drop the input. if seg contains a RST, then drop the
@@ -5353,27 +6248,30 @@
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->iss) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) {
TCP_PROBE5(connect__refused, NULL, tp,
mtod(m, const char *), tp, th);
tp = tcp_drop(tp, ECONNREFUSED);
- rack_do_drop(m, tp);
+ ctf_do_drop(m, tp);
return (1);
}
if (thflags & TH_RST) {
- rack_do_drop(m, tp);
+ ctf_do_drop(m, tp);
return (1);
}
if (!(thflags & TH_SYN)) {
- rack_do_drop(m, tp);
+ ctf_do_drop(m, tp);
return (1);
}
tp->irs = th->th_seq;
tcp_rcvseqinit(tp);
+ rack = (struct tcp_rack *)tp->t_fb_ptr;
if (thflags & TH_ACK) {
+ int tfo_partial = 0;
+
TCPSTAT_INC(tcps_connects);
soisconnected(so);
#ifdef MAC
@@ -5387,22 +6285,47 @@
tp->rcv_adv += min(tp->rcv_wnd,
TCP_MAXWIN << tp->rcv_scale);
/*
+ * If not all the data that was sent in the TFO SYN
+ * has been acked, resend the remainder right away.
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ (tp->snd_una != tp->snd_max)) {
+ tp->snd_nxt = th->th_ack;
+ tfo_partial = 1;
+ }
+ /*
* If there's data, delay ACK; if there's also a FIN ACKNOW
* will be turned on later.
*/
- if (DELAY_ACK(tp, tlen) && tlen != 0) {
- rack_timer_cancel(tp, (struct tcp_rack *)tp->t_fb_ptr,
- ((struct tcp_rack *)tp->t_fb_ptr)->r_ctl.rc_rcvtime, __LINE__);
+ if (DELAY_ACK(tp, tlen) && tlen != 0 && (tfo_partial == 0)) {
+ rack_timer_cancel(tp, rack,
+ rack->r_ctl.rc_rcvtime, __LINE__);
tp->t_flags |= TF_DELACK;
} else {
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ rack->r_wanted_output++;
tp->t_flags |= TF_ACKNOW;
}
- if ((thflags & TH_ECE) && V_tcp_do_ecn) {
+ if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&
+ V_tcp_do_ecn) {
tp->t_flags |= TF_ECN_PERMIT;
TCPSTAT_INC(tcps_ecn_shs);
}
+ if (SEQ_GT(th->th_ack, tp->snd_una)) {
+ /*
+ * We advance snd_una for the
+ * fast open case. If th_ack is
+ * acknowledging data beyond
+ * snd_una we can't just call
+ * ack-processing since the
+ * data stream in our send-map
+ * will start at snd_una + 1 (one
+ * beyond the SYN). If its just
+ * equal we don't need to do that
+ * and there is no send_map.
+ */
+ tp->snd_una++;
+ }
/*
* Received <SYN,ACK> in SYN_SENT[*] state. Transitions:
* SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1
@@ -5454,6 +6377,16 @@
* of step 5, ack processing. Otherwise, goto step 6.
*/
if (thflags & TH_ACK) {
+ /* For syn-sent we need to possibly update the rtt */
+ if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) {
+ uint32_t t;
+
+ t = tcp_ts_getticks() - to->to_tsecr;
+ if (!tp->t_rttlow || tp->t_rttlow > t)
+ tp->t_rttlow = t;
+ tcp_rack_xmit_timer(rack, t + 1);
+ tcp_rack_xmit_timer_commit(rack, tp);
+ }
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val))
return (ret_val);
/* We may have changed to FIN_WAIT_1 above */
@@ -5486,7 +6419,7 @@
}
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
- tiwin, thflags, nxt_pkt));
+ tiwin, thflags, nxt_pkt));
}
/*
@@ -5499,62 +6432,52 @@
struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
{
+ struct tcp_rack *rack;
int32_t ret_val = 0;
int32_t ourfinisacked = 0;
- rack_calc_rwin(so, tp);
-
+ ctf_calc_rwin(so, tp);
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->snd_una) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
-#ifdef TCP_RFC7413
- if (tp->t_flags & TF_FASTOPEN) {
+ rack = (struct tcp_rack *)tp->t_fb_ptr;
+ if (IS_FASTOPEN(tp->t_flags)) {
/*
- * When a TFO connection is in SYN_RECEIVED, the only valid
- * packets are the initial SYN, a retransmit/copy of the
- * initial SYN (possibly with a subset of the original
- * data), a valid ACK, a FIN, or a RST.
+ * When a TFO connection is in SYN_RECEIVED, the
+ * only valid packets are the initial SYN, a
+ * retransmit/copy of the initial SYN (possibly with
+ * a subset of the original data), a valid ACK, a
+ * FIN, or a RST.
*/
if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
} else if (thflags & TH_SYN) {
/* non-initial SYN is ignored */
- struct tcp_rack *rack;
-
- rack = (struct tcp_rack *)tp->t_fb_ptr;
if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT) ||
(rack->r_ctl.rc_hpts_flags & PACE_TMR_TLP) ||
(rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
} else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
-#endif
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
- * RFC5961 Section 4.2 Send challenge ACK for any SYN in
- * synchronized state.
- */
- if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
- return (ret_val);
- }
- /*
* RFC 1323 PAWS: If we have a timestamp reply on this segment and
* it's less than ts_recent, drop it.
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
/*
@@ -5565,10 +6488,10 @@
* "LAND" DoS attack.
*/
if (SEQ_LT(th->th_seq, tp->irs)) {
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -5592,18 +6515,16 @@
tp->ts_recent_age = tcp_ts_getticks();
tp->ts_recent = to->to_tsval;
}
+ tp->snd_wnd = tiwin;
/*
* If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
* is on (half-synchronized state), then queue data for later
* processing; else drop segment and return.
*/
if ((thflags & TH_ACK) == 0) {
-#ifdef TCP_RFC7413
- if (tp->t_flags & TF_FASTOPEN) {
- tp->snd_wnd = tiwin;
+ if (IS_FASTOPEN(tp->t_flags)) {
cc_conn_init(tp);
}
-#endif
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
}
@@ -5613,13 +6534,22 @@
if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
(TF_RCVD_SCALE | TF_REQ_SCALE)) {
tp->rcv_scale = tp->request_r_scale;
- tp->snd_wnd = tiwin;
}
/*
* Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* ->
* FIN-WAIT-1
*/
tp->t_starttime = ticks;
+ if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) {
+ tcp_fastopen_decrement_counter(tp->t_tfo_pending);
+ tp->t_tfo_pending = NULL;
+
+ /*
+ * Account for the ACK of our SYN prior to
+ * regular ACK processing below.
+ */
+ tp->snd_una++;
+ }
if (tp->t_flags & TF_NEEDFIN) {
tcp_state_change(tp, TCPS_FIN_WAIT_1);
tp->t_flags &= ~TF_NEEDFIN;
@@ -5627,25 +6557,13 @@
tcp_state_change(tp, TCPS_ESTABLISHED);
TCP_PROBE5(accept__established, NULL, tp,
mtod(m, const char *), tp, th);
-#ifdef TCP_RFC7413
- if (tp->t_tfo_pending) {
- tcp_fastopen_decrement_counter(tp->t_tfo_pending);
- tp->t_tfo_pending = NULL;
-
- /*
- * Account for the ACK of our SYN prior to regular
- * ACK processing below.
- */
- tp->snd_una++;
- }
/*
* TFO connections call cc_conn_init() during SYN
* processing. Calling it again here for such connections
* is not harmless as it would undo the snd_cwnd reduction
* that occurs when a TFO SYN|ACK is retransmitted.
*/
- if (!(tp->t_flags & TF_FASTOPEN))
-#endif
+ if (!IS_FASTOPEN(tp->t_flags))
cc_conn_init(tp);
}
/*
@@ -5653,9 +6571,19 @@
* not, do so now to pass queued data to user.
*/
if (tlen == 0 && (thflags & TH_FIN) == 0)
- (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0,
+ (void) tcp_reass(tp, (struct tcphdr *)0, NULL, 0,
(struct mbuf *)0);
tp->snd_wl1 = th->th_seq - 1;
+ /* For syn-recv we need to possibly update the rtt */
+ if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) {
+ uint32_t t;
+
+ t = tcp_ts_getticks() - to->to_tsecr;
+ if (!tp->t_rttlow || tp->t_rttlow > t)
+ tp->t_rttlow = t;
+ tcp_rack_xmit_timer(rack, t + 1);
+ tcp_rack_xmit_timer_commit(rack, tp);
+ }
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
return (ret_val);
}
@@ -5735,17 +6663,18 @@
}
}
}
- rack_calc_rwin(so, tp);
+ ctf_calc_rwin(so, tp);
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
* RFC5961 Section 4.2 Send challenge ACK for any SYN in
* synchronized state.
*/
if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
+ ctf_challenge_ack(m, th, tp, &ret_val);
return (ret_val);
}
/*
@@ -5754,10 +6683,10 @@
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -5793,10 +6722,11 @@
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
return (ret_val);
} else {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
@@ -5809,7 +6739,7 @@
if (sbavail(&so->so_snd)) {
if (rack_progress_timeout_check(tp)) {
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
}
@@ -5830,15 +6760,16 @@
{
int32_t ret_val = 0;
- rack_calc_rwin(so, tp);
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ ctf_calc_rwin(so, tp);
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
* RFC5961 Section 4.2 Send challenge ACK for any SYN in
* synchronized state.
*/
if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
+ ctf_challenge_ack(m, th, tp, &ret_val);
return (ret_val);
}
/*
@@ -5847,10 +6778,10 @@
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -5885,10 +6816,11 @@
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
return (ret_val);
} else {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
@@ -5901,7 +6833,7 @@
if (sbavail(&so->so_snd)) {
if (rack_progress_timeout_check(tp)) {
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
}
@@ -5913,7 +6845,7 @@
rack_check_data_after_close(struct mbuf *m,
struct tcpcb *tp, int32_t *tlen, struct tcphdr *th, struct socket *so)
{
- struct tcp_rack *rack;
+ struct tcp_rack *rack;
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
rack = (struct tcp_rack *)tp->t_fb_ptr;
@@ -5921,7 +6853,7 @@
close_now:
tp = tcp_close(tp);
TCPSTAT_INC(tcps_rcvafterclose);
- rack_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen));
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen));
return (1);
}
if (sbavail(&so->so_snd) == 0)
@@ -5947,16 +6879,17 @@
int32_t ret_val = 0;
int32_t ourfinisacked = 0;
- rack_calc_rwin(so, tp);
+ ctf_calc_rwin(so, tp);
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
* RFC5961 Section 4.2 Send challenge ACK for any SYN in
* synchronized state.
*/
if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
+ ctf_challenge_ack(m, th, tp, &ret_val);
return (ret_val);
}
/*
@@ -5965,10 +6898,10 @@
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -6010,10 +6943,11 @@
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
return (ret_val);
} else {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
@@ -6045,7 +6979,7 @@
if (sbavail(&so->so_snd)) {
if (rack_progress_timeout_check(tp)) {
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
}
@@ -6066,16 +7000,17 @@
int32_t ret_val = 0;
int32_t ourfinisacked = 0;
- rack_calc_rwin(so, tp);
+ ctf_calc_rwin(so, tp);
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
* RFC5961 Section 4.2 Send challenge ACK for any SYN in
* synchronized state.
*/
if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
+ ctf_challenge_ack(m, th, tp, &ret_val);
return (ret_val);
}
/*
@@ -6084,10 +7019,10 @@
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -6129,10 +7064,11 @@
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
return (ret_val);
} else {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
@@ -6151,7 +7087,7 @@
if (sbavail(&so->so_snd)) {
if (rack_progress_timeout_check(tp)) {
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
}
@@ -6172,16 +7108,17 @@
int32_t ret_val = 0;
int32_t ourfinisacked = 0;
- rack_calc_rwin(so, tp);
+ ctf_calc_rwin(so, tp);
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
* RFC5961 Section 4.2 Send challenge ACK for any SYN in
* synchronized state.
*/
if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
+ ctf_challenge_ack(m, th, tp, &ret_val);
return (ret_val);
}
/*
@@ -6190,10 +7127,10 @@
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -6235,10 +7172,11 @@
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
return (ret_val);
} else {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
@@ -6251,13 +7189,13 @@
if (ourfinisacked) {
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
tp = tcp_close(tp);
- rack_do_drop(m, tp);
+ ctf_do_drop(m, tp);
return (1);
}
if (sbavail(&so->so_snd)) {
if (rack_progress_timeout_check(tp)) {
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
}
@@ -6279,17 +7217,18 @@
int32_t ret_val = 0;
int32_t ourfinisacked = 0;
- rack_calc_rwin(so, tp);
+ ctf_calc_rwin(so, tp);
/* Reset receive buffer auto scaling when not in bulk receive mode. */
- if (thflags & TH_RST)
- return (rack_process_rst(m, th, so, tp));
+ if ((thflags & TH_RST) ||
+ (tp->t_fin_is_rst && (thflags & TH_FIN)))
+ return (ctf_process_rst(m, th, so, tp));
/*
* RFC5961 Section 4.2 Send challenge ACK for any SYN in
* synchronized state.
*/
if (thflags & TH_SYN) {
- rack_challenge_ack(m, th, tp, &ret_val);
+ ctf_challenge_ack(m, th, tp, &ret_val);
return (ret_val);
}
/*
@@ -6298,10 +7237,10 @@
*/
if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
TSTMP_LT(to->to_tsval, tp->ts_recent)) {
- if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val))
+ if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
return (ret_val);
}
- if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
+ if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) {
return (ret_val);
}
/*
@@ -6344,10 +7283,11 @@
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
- rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
return (ret_val);
} else {
- rack_do_drop(m, NULL);
+ ctf_do_drop(m, NULL);
return (0);
}
}
@@ -6360,7 +7300,7 @@
if (sbavail(&so->so_snd)) {
if (rack_progress_timeout_check(tp)) {
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
- rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
}
@@ -6377,10 +7317,43 @@
rack->r_ctl.rack_rs.rs_rtt_tot = 0;
}
+static void
+rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack)
+{
+ uint32_t tls_seg = 0;
+
+#ifdef KERN_TLS
+ if (rack->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) {
+ tls_seg = ctf_get_opt_tls_size(rack->rc_inp->inp_socket, rack->rc_tp->snd_wnd);
+ rack->r_ctl.rc_pace_min_segs = tls_seg;
+ } else
+#endif
+ rack->r_ctl.rc_pace_min_segs = ctf_fixed_maxseg(tp);
+ rack->r_ctl.rc_pace_max_segs = ctf_fixed_maxseg(tp) * rack->rc_pace_max_segs;
+ if (rack->r_ctl.rc_pace_max_segs > PACE_MAX_IP_BYTES)
+ rack->r_ctl.rc_pace_max_segs = PACE_MAX_IP_BYTES;
+#ifdef KERN_TLS
+ if (tls_seg != 0) {
+ if (rack_hw_tls_max_seg > 1) {
+ rack->r_ctl.rc_pace_max_segs /= tls_seg;
+ if (rack_hw_tls_max_seg < rack->r_ctl.rc_pace_max_segs)
+ rack->r_ctl.rc_pace_max_segs = rack_hw_tls_max_seg;
+ } else {
+ rack->r_ctl.rc_pace_max_segs = 1;
+ }
+ if (rack->r_ctl.rc_pace_max_segs == 0)
+ rack->r_ctl.rc_pace_max_segs = 1;
+ rack->r_ctl.rc_pace_max_segs *= tls_seg;
+ }
+#endif
+ rack_log_type_hrdwtso(tp, rack, tls_seg, rack->rc_inp->inp_socket->so_snd.sb_flags, 0, 2);
+}
+
static int
rack_init(struct tcpcb *tp)
{
struct tcp_rack *rack = NULL;
+ struct rack_sendmap *insret;
tp->t_fb_ptr = uma_zalloc(rack_pcb_zone, M_NOWAIT);
if (tp->t_fb_ptr == NULL) {
@@ -6395,13 +7368,14 @@
memset(tp->t_fb_ptr, 0, sizeof(struct tcp_rack));
rack = (struct tcp_rack *)tp->t_fb_ptr;
- TAILQ_INIT(&rack->r_ctl.rc_map);
+ RB_INIT(&rack->r_ctl.rc_mtree);
TAILQ_INIT(&rack->r_ctl.rc_free);
TAILQ_INIT(&rack->r_ctl.rc_tmap);
rack->rc_tp = tp;
if (tp->t_inpcb) {
rack->rc_inp = tp->t_inpcb;
}
+ tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ;
/* Probably not needed but lets be sure */
rack_clear_rate_sample(rack);
rack->r_cpu = 0;
@@ -6409,27 +7383,36 @@
rack->rc_allow_data_af_clo = rack_ignore_data_after_close;
rack->r_ctl.rc_tlp_threshold = rack_tlp_thresh;
rack->rc_pace_reduce = rack_slot_reduction;
+ if (use_rack_cheat)
+ rack->use_rack_cheat = 1;
if (V_tcp_delack_enabled)
tp->t_delayed_ack = 1;
else
tp->t_delayed_ack = 0;
rack->rc_pace_max_segs = rack_hptsi_segments;
- rack->r_ctl.rc_early_recovery_segs = rack_early_recovery_max_seg;
rack->r_ctl.rc_reorder_shift = rack_reorder_thresh;
rack->r_ctl.rc_pkt_delay = rack_pkt_delay;
rack->r_ctl.rc_prop_reduce = rack_use_proportional_reduce;
- rack->r_idle_reduce_largest = rack_reduce_largest_on_idle;
rack->r_enforce_min_pace = rack_min_pace_time;
- rack->r_min_pace_seg_thresh = rack_min_pace_time_seg_req;
rack->r_ctl.rc_prop_rate = rack_proportional_rate;
rack->r_ctl.rc_tlp_cwnd_reduce = rack_lower_cwnd_at_tlp;
rack->r_ctl.rc_early_recovery = rack_early_recovery;
rack->rc_always_pace = rack_pace_every_seg;
+ rack_set_pace_segments(tp, rack);
+ rack->r_ctl.rc_high_rwnd = tp->snd_wnd;
rack->r_ctl.rc_rate_sample_method = rack_rate_sample_method;
rack->rack_tlp_threshold_use = rack_tlp_threshold_use;
rack->r_ctl.rc_prr_sendalot = rack_send_a_lot_in_prr;
rack->r_ctl.rc_min_to = rack_min_to;
- rack->r_ctl.rc_prr_inc_var = rack_inc_var;
+ rack->rack_per_of_gp = rack_per_of_gp;
+ microuptime(&rack->r_ctl.rc_last_ack);
+ rack->r_ctl.rc_last_time_decay = rack->r_ctl.rc_last_ack;
+ rack->r_ctl.rc_tlp_rxt_last_time = tcp_ts_getticks();
+ /* Do we force on detection? */
+ if (tcp_force_detection)
+ rack->do_detection = 1;
+ else
+ rack->do_detection = 0;
if (tp->snd_una != tp->snd_max) {
/* Create a send map for the current outstanding data */
struct rack_sendmap *rsm;
@@ -6441,18 +7424,24 @@
return (ENOMEM);
}
rsm->r_flags = RACK_OVERMAX;
- rsm->r_tim_lastsent[0] = tcp_ts_getticks();
+ rsm->r_tim_lastsent[0] = rack->r_ctl.rc_tlp_rxt_last_time;
rsm->r_rtr_cnt = 1;
rsm->r_rtr_bytes = 0;
rsm->r_start = tp->snd_una;
rsm->r_end = tp->snd_max;
- rsm->r_sndcnt = 0;
- TAILQ_INSERT_TAIL(&rack->r_ctl.rc_map, rsm, r_next);
+ rsm->r_dupack = 0;
+ insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+#ifdef INVARIANTS
+ if (insret != NULL) {
+ panic("Insert in rb tree fails ret:%p rack:%p rsm:%p",
+ insret, rack, rsm);
+ }
+#endif
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
}
rack_stop_all_timers(tp);
- rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), __LINE__, 0, 0, 0);
+ rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0);
return (0);
}
@@ -6472,7 +7461,7 @@
*/
return (EAGAIN);
}
- if (tp->t_flags & TF_SACK_PERMIT) {
+ if ((tp->t_flags & TF_SACK_PERMIT) || rack_sack_not_required){
return (0);
}
/*
@@ -6487,21 +7476,28 @@
{
if (tp->t_fb_ptr) {
struct tcp_rack *rack;
- struct rack_sendmap *rsm;
-
+ struct rack_sendmap *rsm, *nrsm, *rm;
+ if (tp->t_inpcb) {
+ tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
+ tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
+ }
rack = (struct tcp_rack *)tp->t_fb_ptr;
#ifdef TCP_BLACKBOX
tcp_log_flowend(tp);
#endif
- rsm = TAILQ_FIRST(&rack->r_ctl.rc_map);
- while (rsm) {
- TAILQ_REMOVE(&rack->r_ctl.rc_map, rsm, r_next);
+ RB_FOREACH_SAFE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm) {
+ rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+#ifdef INVARIANTS
+ if (rm != rsm) {
+ panic("At fini, rack:%p rsm:%p rm:%p",
+ rack, rsm, rm);
+ }
+#endif
uma_zfree(rack_zone, rsm);
- rsm = TAILQ_FIRST(&rack->r_ctl.rc_map);
}
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
while (rsm) {
- TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_next);
+ TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
uma_zfree(rack_zone, rsm);
rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
}
@@ -6513,6 +7509,7 @@
tp->snd_nxt = tp->snd_max;
}
+
static void
rack_set_state(struct tcpcb *tp, struct tcp_rack *rack)
{
@@ -6526,6 +7523,7 @@
rack->r_substate = rack_do_syn_recv;
break;
case TCPS_ESTABLISHED:
+ rack_set_pace_segments(tp, rack);
rack->r_state = TCPS_ESTABLISHED;
rack->r_substate = rack_do_established;
break;
@@ -6600,21 +7598,13 @@
return;
}
}
- if (rsm && (rsm->r_flags & RACK_SACK_PASSED)) {
- if ((tp->t_flags & TF_SENTFIN) &&
- ((tp->snd_max - tp->snd_una) == 1) &&
- (rsm->r_flags & RACK_HAS_FIN)) {
- /* needs to be a RXT */
- if (tmr_up == PACE_TMR_RXT)
- return;
- } else if (tmr_up == PACE_TMR_RACK)
- return;
- } else if (SEQ_GT(tp->snd_max,tp->snd_una) &&
+ if (SEQ_GT(tp->snd_max, tp->snd_una) &&
((tmr_up == PACE_TMR_TLP) ||
+ (tmr_up == PACE_TMR_RACK) ||
(tmr_up == PACE_TMR_RXT))) {
/*
- * Either a TLP or RXT is fine if no sack-passed
- * is in place and data is outstanding.
+ * Either a Rack, TLP or RXT is fine if we
+ * have outstanding data.
*/
return;
} else if (tmr_up == PACE_TMR_DELACK) {
@@ -6633,11 +7623,11 @@
* with the slot set to what was in the saved slot.
*/
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
- rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), __LINE__, 0, 0, 0);
+ rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0);
}
-static void
-rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
+static int
+rack_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so,
struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos,
int32_t nxt_pkt, struct timeval *tv)
{
@@ -6650,6 +7640,10 @@
struct rack_sendmap *rsm;
int32_t prev_state = 0;
+ if (m->m_flags & M_TSTMP_LRO) {
+ tv->tv_sec = m->m_pkthdr.rcv_tstmp /1000000000;
+ tv->tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000;
+ }
cts = tcp_tv_to_mssectick(tv);
rack = (struct tcp_rack *)tp->t_fb_ptr;
@@ -6662,34 +7656,55 @@
* allow the tcbinfo to be in either locked or unlocked, as the
* caller may have unnecessarily acquired a lock due to a race.
*/
+ if ((thflags & (TH_SYN | TH_FIN | TH_RST)) != 0 ||
+ tp->t_state != TCPS_ESTABLISHED) {
+ INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
+ }
INP_WLOCK_ASSERT(tp->t_inpcb);
KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN",
__func__));
KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT",
__func__));
- {
+ if (tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
log.u_bbr.ininput = rack->rc_inp->inp_in_input;
+ log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced;
- TCP_LOG_EVENT(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0,
- tlen, &log, true);
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ log.u_bbr.pkts_out = rack->rc_tp->t_maxseg;
+ TCP_LOG_EVENTP(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0,
+ tlen, &log, true, &tv);
}
+ if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {
+ way_out = 4;
+ retval = 0;
+ goto done_with_input;
+ }
/*
+ * If a segment with the ACK-bit set arrives in the SYN-SENT state
+ * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9.
+ */
+ if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&
+ (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) {
+ ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
+ return(1);
+ }
+ /*
* Segment received on connection. Reset idle time and keep-alive
* timer. XXX: This should be done after segment validation to
* ignore broken/spoofed segs.
*/
- if (tp->t_idle_reduce && (tp->snd_max == tp->snd_una)) {
- if ((ticks - tp->t_rcvtime) >= tp->t_rxtcur) {
- counter_u64_add(rack_input_idle_reduces, 1);
- rack_cc_after_idle(tp,
- (rack->r_idle_reduce_largest ? 1 :0));
- }
+ if (tp->t_idle_reduce &&
+ (tp->snd_max == tp->snd_una) &&
+ ((ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
+ counter_u64_add(rack_input_idle_reduces, 1);
+ rack_cc_after_idle(tp);
}
- rack->r_ctl.rc_rcvtime = cts;
tp->t_rcvtime = ticks;
/*
@@ -6700,6 +7715,8 @@
#ifdef NETFLIX_STATS
stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin);
#endif
+ if (tiwin > rack->r_ctl.rc_high_rwnd)
+ rack->r_ctl.rc_high_rwnd = tiwin;
/*
* TCP ECN processing. XXXJTL: If we ever use ECN, we need to move
* this to occur after we've validated the segment.
@@ -6782,6 +7799,22 @@
if ((tp->t_flags & TF_SACK_PERMIT) &&
(to.to_flags & TOF_SACKPERM) == 0)
tp->t_flags &= ~TF_SACK_PERMIT;
+ if (IS_FASTOPEN(tp->t_flags)) {
+ if (to.to_flags & TOF_FASTOPEN) {
+ uint16_t mss;
+
+ if (to.to_flags & TOF_MSS)
+ mss = to.to_mss;
+ else
+ if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0)
+ mss = TCP6_MSS;
+ else
+ mss = TCP_MSS;
+ tcp_fastopen_update_cache(tp, mss,
+ to.to_tfo_len, to.to_tfo_cookie);
+ } else
+ tcp_fastopen_disable_path(tp);
+ }
}
/*
* At this point we are at the initial call. Here we decide
@@ -6793,7 +7826,7 @@
tcp_switch_back_to_default(tp);
(*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen,
tlen, iptos);
- return;
+ return (1);
}
/* Set the flag */
rack->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0;
@@ -6805,9 +7838,12 @@
* always. All other times (timers etc) we must have a rack-state
* set (so we assure we have done the checks above for SACK).
*/
+ memcpy(&rack->r_ctl.rc_last_ack, tv, sizeof(struct timeval));
+ rack->r_ctl.rc_rcvtime = cts;
if (rack->r_state != tp->t_state)
rack_set_state(tp, rack);
- if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&rack->r_ctl.rc_map)) != NULL)
+ if (SEQ_GT(th->th_ack, tp->snd_una) &&
+ (rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree)) != NULL)
kern_prefetch(rsm, &prev_state);
prev_state = rack->r_state;
rack->r_ctl.rc_tlp_send_cnt = 0;
@@ -6828,15 +7864,24 @@
* is gone.
*/
INP_WLOCK_ASSERT(tp->t_inpcb);
+ if (rack->set_pacing_done_a_iw == 0) {
+ /* How much has been acked? */
+ if ((tp->snd_una - tp->iss) > (ctf_fixed_maxseg(tp) * 10)) {
+ /* We have enough to set in the pacing segment size */
+ rack->set_pacing_done_a_iw = 1;
+ rack_set_pace_segments(tp, rack);
+ }
+ }
tcp_rack_xmit_timer_commit(rack, tp);
- if (nxt_pkt == 0) {
+ if ((nxt_pkt == 0) || (IN_RECOVERY(tp->t_flags))) {
if (rack->r_wanted_output != 0) {
did_out = 1;
(void)tp->t_fb->tfb_tcp_output(tp);
}
- rack_start_hpts_timer(rack, tp, cts, __LINE__, 0, 0, 0);
+ rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
}
- if (((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) &&
+ if ((nxt_pkt == 0) &&
+ ((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) &&
(SEQ_GT(tp->snd_max, tp->snd_una) ||
(tp->t_flags & TF_DELACK) ||
((tcp_always_keepalive || rack->rc_inp->inp_socket->so_options & SO_KEEPALIVE) &&
@@ -6844,20 +7889,24 @@
/* We could not send (probably in the hpts but stopped the timer earlier)? */
if ((tp->snd_max == tp->snd_una) &&
((tp->t_flags & TF_DELACK) == 0) &&
+ (rack->rc_inp->inp_in_hpts) &&
(rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
/* keep alive not needed if we are hptsi output yet */
;
} else {
- if (rack->rc_inp->inp_in_hpts)
+ if (rack->rc_inp->inp_in_hpts) {
tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT);
- rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), __LINE__, 0, 0, 0);
+ counter_u64_add(rack_per_timer_hole, 1);
+ }
+ rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0);
}
way_out = 1;
- } else {
+ } else if (nxt_pkt == 0) {
/* Do we have the correct timer running? */
rack_timer_audit(tp, rack, &so->so_snd);
way_out = 2;
}
+ done_with_input:
rack_log_doseg_done(rack, cts, nxt_pkt, did_out, way_out);
if (did_out)
rack->r_wanted_output = 0;
@@ -6868,8 +7917,8 @@
retval, tp, prev_state);
}
#endif
- INP_WUNLOCK(tp->t_inpcb);
}
+ return (retval);
}
void
@@ -6877,29 +7926,24 @@
struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos)
{
struct timeval tv;
-#ifdef RSS
- struct tcp_function_block *tfb;
- struct tcp_rack *rack;
- struct inpcb *inp;
- rack = (struct tcp_rack *)tp->t_fb_ptr;
- if (rack->r_state == 0) {
- /*
- * Initial input (ACK to SYN-ACK etc)lets go ahead and get
- * it processed
- */
+ /* First lets see if we have old packets */
+ if (tp->t_in_pkt) {
+ if (ctf_do_queued_segments(so, tp, 1)) {
+ m_freem(m);
+ return;
+ }
+ }
+ if (m->m_flags & M_TSTMP_LRO) {
+ tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000;
+ tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000;
+ } else {
+ /* Should not be should we kassert instead? */
tcp_get_usecs(&tv);
- rack_hpts_do_segment(m, th, so, tp, drop_hdrlen,
- tlen, iptos, 0, &tv);
- return;
}
- tcp_queue_to_input(tp, m, th, tlen, drop_hdrlen, iptos);
- INP_WUNLOCK(tp->t_inpcb);
-#else
- tcp_get_usecs(&tv);
- rack_hpts_do_segment(m, th, so, tp, drop_hdrlen,
- tlen, iptos, 0, &tv);
-#endif
+ if(rack_do_segment_nounlock(m, th, so, tp,
+ drop_hdrlen, tlen, iptos, 0, &tv) == 0)
+ INP_WUNLOCK(tp->t_inpcb);
}
struct rack_sendmap *
@@ -6907,10 +7951,10 @@
{
struct rack_sendmap *rsm = NULL;
int32_t idx;
- uint32_t srtt_cur, srtt = 0, thresh = 0, ts_low = 0;
+ uint32_t srtt = 0, thresh = 0, ts_low = 0;
/* Return the next guy to be re-transmitted */
- if (TAILQ_EMPTY(&rack->r_ctl.rc_map)) {
+ if (RB_EMPTY(&rack->r_ctl.rc_mtree)) {
return (NULL);
}
if (tp->t_flags & TF_SENTFIN) {
@@ -6927,10 +7971,6 @@
return (NULL);
}
check_it:
- srtt_cur = tp->t_srtt >> TCP_RTT_SHIFT;
- srtt = TICKS_2_MSEC(srtt_cur);
- if (rack->rc_rack_rtt && (srtt > rack->rc_rack_rtt))
- srtt = rack->rc_rack_rtt;
if (rsm->r_flags & RACK_ACKED) {
return (NULL);
}
@@ -6938,18 +7978,133 @@
/* Its not yet ready */
return (NULL);
}
+ srtt = rack_grab_rtt(tp, rack);
idx = rsm->r_rtr_cnt - 1;
ts_low = rsm->r_tim_lastsent[idx];
thresh = rack_calc_thresh_rack(rack, srtt, tsused);
- if (tsused <= ts_low) {
+ if ((tsused == ts_low) ||
+ (TSTMP_LT(tsused, ts_low))) {
+ /* No time since sending */
return (NULL);
}
- if ((tsused - ts_low) >= thresh) {
+ if ((tsused - ts_low) < thresh) {
+ /* It has not been long enough yet */
+ return (NULL);
+ }
+ if ((rsm->r_dupack >= DUP_ACK_THRESHOLD) ||
+ ((rsm->r_flags & RACK_SACK_PASSED) &&
+ (rack->sack_attack_disable == 0))) {
+ /*
+ * We have passed the dup-ack threshold <or>
+ * a SACK has indicated this is missing.
+ * Note that if you are a declared attacker
+ * it is only the dup-ack threshold that
+ * will cause retransmits.
+ */
+ /* log retransmit reason */
+ rack_log_retran_reason(rack, rsm, (tsused - ts_low), thresh, 1);
return (rsm);
}
return (NULL);
}
+static int32_t
+rack_get_pacing_delay(struct tcp_rack *rack, struct tcpcb *tp, uint32_t len)
+{
+ int32_t slot = 0;
+
+ if ((rack->rack_per_of_gp == 0) ||
+ (rack->rc_always_pace == 0)) {
+ /*
+ * We use the most optimistic possible cwnd/srtt for
+ * sending calculations. This will make our
+ * calculation anticipate getting more through
+ * quicker then possible. But thats ok we don't want
+ * the peer to have a gap in data sending.
+ */
+ uint32_t srtt, cwnd, tr_perms = 0;
+
+old_method:
+ if (rack->r_ctl.rc_rack_min_rtt)
+ srtt = rack->r_ctl.rc_rack_min_rtt;
+ else
+ srtt = TICKS_2_MSEC((tp->t_srtt >> TCP_RTT_SHIFT));
+ if (rack->r_ctl.rc_rack_largest_cwnd)
+ cwnd = rack->r_ctl.rc_rack_largest_cwnd;
+ else
+ cwnd = tp->snd_cwnd;
+ tr_perms = cwnd / srtt;
+ if (tr_perms == 0) {
+ tr_perms = ctf_fixed_maxseg(tp);
+ }
+ /*
+ * Calculate how long this will take to drain, if
+ * the calculation comes out to zero, thats ok we
+ * will use send_a_lot to possibly spin around for
+ * more increasing tot_len_this_send to the point
+ * that its going to require a pace, or we hit the
+ * cwnd. Which in that case we are just waiting for
+ * a ACK.
+ */
+ slot = len / tr_perms;
+ /* Now do we reduce the time so we don't run dry? */
+ if (slot && rack->rc_pace_reduce) {
+ int32_t reduce;
+
+ reduce = (slot / rack->rc_pace_reduce);
+ if (reduce < slot) {
+ slot -= reduce;
+ } else
+ slot = 0;
+ }
+ } else {
+ int cnt;
+ uint64_t bw_est, bw_raise, res, lentim;
+
+ bw_est = 0;
+ for (cnt=0; cnt<RACK_GP_HIST; cnt++) {
+ if ((rack->r_ctl.rc_gp_hist_filled == 0) &&
+ (rack->r_ctl.rc_gp_history[cnt] == 0))
+ break;
+ bw_est += rack->r_ctl.rc_gp_history[cnt];
+ }
+ if (bw_est == 0) {
+ /*
+ * No way yet to make a b/w estimate
+ * (no goodput est yet).
+ */
+ goto old_method;
+ }
+ /* Covert to bytes per second */
+ bw_est *= MSEC_IN_SECOND;
+ /*
+ * Now ratchet it up by our percentage. Note
+ * that the minimum you can do is 1 which would
+ * get you 101% of the average last N goodput estimates.
+ * The max you can do is 256 which would yeild you
+ * 356% of the last N goodput estimates.
+ */
+ bw_raise = bw_est * (uint64_t)rack->rack_per_of_gp;
+ bw_est += bw_raise;
+ /* average by the number we added */
+ bw_est /= cnt;
+ /* Now calculate a rate based on this b/w */
+ lentim = (uint64_t) len * (uint64_t)MSEC_IN_SECOND;
+ res = lentim / bw_est;
+ slot = (uint32_t)res;
+ }
+ if (rack->r_enforce_min_pace &&
+ (slot == 0)) {
+ /* We are enforcing a minimum pace time of 1ms */
+ slot = rack->r_enforce_min_pace;
+ }
+ if (slot)
+ counter_u64_add(rack_calc_nonzero, 1);
+ else
+ counter_u64_add(rack_calc_zero, 1);
+ return (slot);
+}
+
static int
rack_output(struct tcpcb *tp)
{
@@ -6961,22 +8116,19 @@
struct mbuf *mb;
uint32_t if_hw_tsomaxsegcount = 0;
uint32_t if_hw_tsomaxsegsize;
+ int32_t maxseg;
long tot_len_this_send = 0;
struct ip *ip = NULL;
#ifdef TCPDEBUG
struct ipovly *ipov = NULL;
#endif
-#ifdef NETFLIX_TCP_O_UDP
struct udphdr *udp = NULL;
-#endif
struct tcp_rack *rack;
struct tcphdr *th;
uint8_t pass = 0;
+ uint8_t wanted_cookie = 0;
u_char opt[TCP_MAXOLEN];
- unsigned ipoptlen, optlen, hdrlen;
-#ifdef NETFLIX_TCP_O_UDP
- unsigned ulen;
-#endif
+ unsigned ipoptlen, optlen, hdrlen, ulen=0;
uint32_t rack_seq;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
@@ -6987,13 +8139,16 @@
int32_t sub_from_prr = 0;
volatile int32_t sack_rxmit;
struct rack_sendmap *rsm = NULL;
- int32_t tso, mtu, would_have_fin = 0;
+ int32_t tso, mtu;
struct tcpopt to;
int32_t slot = 0;
+ int32_t sup_rack = 0;
uint32_t cts;
- uint8_t hpts_calling, doing_tlp = 0;
+ uint8_t hpts_calling, new_data_tlp = 0, doing_tlp = 0;
int32_t do_a_prefetch;
int32_t prefetch_rsm = 0;
+ int force_tso = 0;
+ int32_t orig_len;
int32_t prefetch_so_done = 0;
struct tcp_log_buffer *lgb = NULL;
struct inpcb *inp;
@@ -7002,11 +8157,8 @@
struct ip6_hdr *ip6 = NULL;
int32_t isipv6;
#endif
-#ifdef KERN_TLS
- const bool hw_tls = (so->so_snd.sb_flags & SB_TLS_IFNET) != 0;
-#else
- const bool hw_tls = false;
-#endif
+ uint8_t filled_all = 0;
+ bool hw_tls = false;
/* setup and take the cache hits here */
rack = (struct tcp_rack *)tp->t_fb_ptr;
@@ -7015,24 +8167,26 @@
sb = &so->so_snd;
kern_prefetch(sb, &do_a_prefetch);
do_a_prefetch = 1;
+
+#ifdef KERN_TLS
+ hw_tls = (so->so_snd.sb_flags & SB_TLS_IFNET) != 0;
+#endif
INP_WLOCK_ASSERT(inp);
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE)
return (tcp_offload_output(tp));
#endif
-
-#ifdef TCP_RFC7413
+ maxseg = ctf_fixed_maxseg(tp);
/*
* For TFO connections in SYN_RECEIVED, only allow the initial
* SYN|ACK and those sent by the retransmit timer.
*/
- if ((tp->t_flags & TF_FASTOPEN) &&
+ if (IS_FASTOPEN(tp->t_flags) &&
(tp->t_state == TCPS_SYN_RECEIVED) &&
- SEQ_GT(tp->snd_max, tp->snd_una) && /* inital SYN|ACK sent */
- (tp->snd_nxt != tp->snd_una)) /* not a retransmit */
+ SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN|ACK sent */
+ (rack->r_ctl.rc_resend == NULL)) /* not a retransmit */
return (0);
-#endif
#ifdef INET6
if (rack->r_state) {
/* Use the cache line loaded if possible */
@@ -7075,6 +8229,17 @@
rack->r_wanted_output = 0;
rack->r_timer_override = 0;
/*
+ * For TFO connections in SYN_SENT or SYN_RECEIVED,
+ * only allow the initial SYN or SYN|ACK and those sent
+ * by the retransmit timer.
+ */
+ if (IS_FASTOPEN(tp->t_flags) &&
+ ((tp->t_state == TCPS_SYN_RECEIVED) ||
+ (tp->t_state == TCPS_SYN_SENT)) &&
+ SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN or SYN|ACK sent */
+ (tp->t_rxtshift == 0)) /* not a retransmit */
+ return (0);
+ /*
* Determine length of data that should be transmitted, and flags
* that will be used. If there is some data or critical controls
* (SYN, RST) to send, then transmit; otherwise, investigate
@@ -7083,8 +8248,7 @@
idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una);
if (tp->t_idle_reduce) {
if (idle && ((ticks - tp->t_rcvtime) >= tp->t_rxtcur))
- rack_cc_after_idle(tp,
- (rack->r_idle_reduce_largest ? 1 :0));
+ rack_cc_after_idle(tp);
}
tp->t_flags &= ~TF_LASTIDLE;
if (idle) {
@@ -7107,17 +8271,6 @@
sendwin = min(tp->snd_wnd, tp->snd_cwnd);
flags = tcp_outflags[tp->t_state];
- /*
- * Send any SACK-generated retransmissions. If we're explicitly
- * trying to send out new data (when sendalot is 1), bypass this
- * function. If we retransmit in fast recovery mode, decrement
- * snd_cwnd, since we're replacing a (future) new transmission with
- * a retransmission now, and we previously incremented snd_cwnd in
- * tcp_input().
- */
- /*
- * Still in sack recovery , reset rxmit flag to zero.
- */
while (rack->rc_free_cnt < rack_free_cache) {
rsm = rack_alloc(rack);
if (rsm == NULL) {
@@ -7126,7 +8279,7 @@
slot = 1;
goto just_return_nolock;
}
- TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_next);
+ TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext);
rack->rc_free_cnt++;
rsm = NULL;
}
@@ -7145,18 +8298,24 @@
long tlen;
doing_tlp = 1;
- rsm = rack->r_ctl.rc_tlpsend;
+ /*
+ * Check if we can do a TLP with a RACK'd packet
+ * this can happen if we are not doing the rack
+ * cheat and we skipped to a TLP and it
+ * went off.
+ */
+ rsm = tcp_rack_output(tp, rack, cts);
+ if (rsm == NULL)
+ rsm = rack->r_ctl.rc_tlpsend;
rack->r_ctl.rc_tlpsend = NULL;
sack_rxmit = 1;
tlen = rsm->r_end - rsm->r_start;
- if (tlen > tp->t_maxseg)
- tlen = tp->t_maxseg;
-#ifdef INVARIANTS
- if (SEQ_GT(tp->snd_una, rsm->r_start)) {
- panic("tp:%p rack:%p snd_una:%u rsm:%p r_start:%u",
- tp, rack, tp->snd_una, rsm, rsm->r_start);
- }
-#endif
+ if (tlen > ctf_fixed_maxseg(tp))
+ tlen = ctf_fixed_maxseg(tp);
+ KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
+ ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
+ __func__, __LINE__,
+ rsm->r_start, tp->snd_una, tp, rack, rsm));
sb_offset = rsm->r_start - tp->snd_una;
cwin = min(tp->snd_wnd, tlen);
len = cwin;
@@ -7167,16 +8326,19 @@
len = rsm->r_end - rsm->r_start;
sack_rxmit = 1;
sendalot = 0;
+ KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
+ ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
+ __func__, __LINE__,
+ rsm->r_start, tp->snd_una, tp, rack, rsm));
sb_offset = rsm->r_start - tp->snd_una;
- if (len >= tp->t_maxseg) {
- len = tp->t_maxseg;
+ if (len >= ctf_fixed_maxseg(tp)) {
+ len = ctf_fixed_maxseg(tp);
}
- KASSERT(sb_offset >= 0, ("%s: sack block to the left of una : %d",
- __func__, sb_offset));
} else if ((rack->rc_in_persist == 0) &&
((rsm = tcp_rack_output(tp, rack, cts)) != NULL)) {
- long tlen;
+ int maxseg;
+ maxseg = ctf_fixed_maxseg(tp);
if ((!IN_RECOVERY(tp->t_flags)) &&
((tp->t_flags & (TF_WASFRECOVERY | TF_WASCRECOVERY)) == 0)) {
/* Enter recovery if not induced by a time-out */
@@ -7188,7 +8350,8 @@
* When we enter recovery we need to assure we send
* one packet.
*/
- rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg;
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 13);
}
#ifdef INVARIANTS
if (SEQ_LT(rsm->r_start, tp->snd_una)) {
@@ -7196,39 +8359,57 @@
tp, rack, rsm, rsm->r_start, tp->snd_una);
}
#endif
- tlen = rsm->r_end - rsm->r_start;
+ len = rsm->r_end - rsm->r_start;
+ KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
+ ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
+ __func__, __LINE__,
+ rsm->r_start, tp->snd_una, tp, rack, rsm));
sb_offset = rsm->r_start - tp->snd_una;
- if (tlen > rack->r_ctl.rc_prr_sndcnt) {
- len = rack->r_ctl.rc_prr_sndcnt;
- } else {
- len = tlen;
- }
- if (len >= tp->t_maxseg) {
- sendalot = 1;
- len = tp->t_maxseg;
- } else {
- sendalot = 0;
- if ((rack->rc_timer_up == 0) &&
- (len < tlen)) {
+ /* Can we send it within the PRR boundary? */
+ if ((rack->use_rack_cheat == 0) && (len > rack->r_ctl.rc_prr_sndcnt)) {
+ /* It does not fit */
+ if ((ctf_flight_size(tp, rack->r_ctl.rc_sacked) > len) &&
+ (rack->r_ctl.rc_prr_sndcnt < maxseg)) {
/*
- * If its not a timer don't send a partial
- * segment.
+ * prr is less than a segment, we
+ * have more acks due in besides
+ * what we need to resend. Lets not send
+ * to avoid sending small pieces of
+ * what we need to retransmit.
*/
len = 0;
goto just_return_nolock;
}
+ len = rack->r_ctl.rc_prr_sndcnt;
}
- KASSERT(sb_offset >= 0, ("%s: sack block to the left of una : %d",
- __func__, sb_offset));
+ sendalot = 0;
+ if (len >= maxseg) {
+ len = maxseg;
+ }
if (len > 0) {
sub_from_prr = 1;
sack_rxmit = 1;
TCPSTAT_INC(tcps_sack_rexmits);
TCPSTAT_ADD(tcps_sack_rexmit_bytes,
- min(len, tp->t_maxseg));
+ min(len, ctf_fixed_maxseg(tp)));
counter_u64_add(rack_rtm_prr_retran, 1);
}
}
+ /*
+ * Enforce a connection sendmap count limit if set
+ * as long as we are not retransmiting.
+ */
+ if ((rsm == NULL) &&
+ (rack->do_detection == 0) &&
+ (rack_tcp_map_entries_limit > 0) &&
+ (rack->r_ctl.rc_num_maps_alloced >= rack_tcp_map_entries_limit)) {
+ counter_u64_add(rack_to_alloc_limited, 1);
+ if (!rack->alloc_limit_reported) {
+ rack->alloc_limit_reported = 1;
+ counter_u64_add(rack_alloc_limited_conns, 1);
+ }
+ goto just_return_nolock;
+ }
if (rsm && (rsm->r_flags & RACK_HAS_FIN)) {
/* we are retransmitting the fin */
len--;
@@ -7244,20 +8425,6 @@
/* For debugging */
rack->r_ctl.rc_rsm_at_retran = rsm;
#endif
- /*
- * Enforce a connection sendmap count limit if set
- * as long as we are not retransmiting.
- */
- if ((rsm == NULL) &&
- (rack_map_entries_limit > 0) &&
- (rack->r_ctl.rc_num_maps_alloced >= rack_map_entries_limit)) {
- counter_u64_add(rack_to_alloc_limited, 1);
- if (!rack->alloc_limit_reported) {
- rack->alloc_limit_reported = 1;
- counter_u64_add(rack_alloc_limited_conns, 1);
- }
- goto just_return_nolock;
- }
/*
* Get standard flags, and add SYN or FIN if requested by 'hidden'
* state flags.
@@ -7299,7 +8466,9 @@
flags &= ~TH_FIN;
sendwin = 1;
} else {
- if (rack->rc_in_persist)
+ if ((rack->rc_in_persist != 0) &&
+ (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
+ rack->r_ctl.rc_pace_min_segs)))
rack_exit_persist(tp, rack);
/*
* If we are dropping persist mode then we need to
@@ -7328,7 +8497,7 @@
uint32_t avail;
avail = sbavail(sb);
- if (SEQ_GT(tp->snd_nxt, tp->snd_una))
+ if (SEQ_GT(tp->snd_nxt, tp->snd_una) && avail)
sb_offset = tp->snd_nxt - tp->snd_una;
else
sb_offset = 0;
@@ -7343,7 +8512,7 @@
else
len = rack->r_ctl.rc_tlp_new_data;
rack->r_ctl.rc_tlp_new_data = 0;
- doing_tlp = 1;
+ new_data_tlp = doing_tlp = 1;
} else {
if (sendwin > avail) {
/* use the available */
@@ -7387,13 +8556,12 @@
if (len > 0) {
if (len > rack->r_ctl.rc_prr_sndcnt)
len = rack->r_ctl.rc_prr_sndcnt;
-
if (len > 0) {
sub_from_prr = 1;
counter_u64_add(rack_rtm_prr_newdata, 1);
}
}
- if (len > tp->t_maxseg) {
+ if (len > ctf_fixed_maxseg(tp)) {
/*
* We should never send more than a MSS when
* retransmitting or sending new data in prr
@@ -7402,8 +8570,8 @@
* let us send a lot as well :-)
*/
if (rack->r_ctl.rc_prr_sendalot == 0)
- len = tp->t_maxseg;
- } else if (len < tp->t_maxseg) {
+ len = ctf_fixed_maxseg(tp);
+ } else if (len < ctf_fixed_maxseg(tp)) {
/*
* Do we send any? The idea here is if the
* send empty's the socket buffer we want to
@@ -7429,19 +8597,18 @@
* SYN-SENT state and if segment contains data and if we don't know
* that foreign host supports TAO, suppress sending segment.
*/
- if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {
- if ((tp->t_state != TCPS_SYN_RECEIVED) &&
- (tp->t_state != TCPS_SYN_SENT))
+ if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una) &&
+ ((sack_rxmit == 0) && (tp->t_rxtshift == 0))) {
+ if (tp->t_state != TCPS_SYN_RECEIVED)
flags &= ~TH_SYN;
-#ifdef TCP_RFC7413
/*
* When sending additional segments following a TFO SYN|ACK,
* do not include the SYN bit.
*/
- if ((tp->t_flags & TF_FASTOPEN) &&
+ if (IS_FASTOPEN(tp->t_flags) &&
(tp->t_state == TCPS_SYN_RECEIVED))
flags &= ~TH_SYN;
-#endif
+ sb_offset--, len++;
}
/*
* Be careful not to send data and/or FIN on SYN segments. This
@@ -7452,16 +8619,30 @@
len = 0;
flags &= ~TH_FIN;
}
-#ifdef TCP_RFC7413
/*
- * When retransmitting SYN|ACK on a passively-created TFO socket,
- * don't include data, as the presence of data may have caused the
- * original SYN|ACK to have been dropped by a middlebox.
+ * On TFO sockets, ensure no data is sent in the following cases:
+ *
+ * - When retransmitting SYN|ACK on a passively-created socket
+ *
+ * - When retransmitting SYN on an actively created socket
+ *
+ * - When sending a zero-length cookie (cookie request) on an
+ * actively created socket
+ *
+ * - When the socket is in the CLOSED state (RST is being sent)
*/
- if ((tp->t_flags & TF_FASTOPEN) &&
- ((tp->t_state == TCPS_SYN_RECEIVED) && (tp->t_rxtshift > 0)))
+ if (IS_FASTOPEN(tp->t_flags) &&
+ (((flags & TH_SYN) && (tp->t_rxtshift > 0)) ||
+ ((tp->t_state == TCPS_SYN_SENT) &&
+ (tp->t_tfo_client_cookie_len == 0)) ||
+ (flags & TH_RST))) {
+ sack_rxmit = 0;
len = 0;
-#endif
+ }
+ /* Without fast-open there should never be data sent on a SYN */
+ if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags)))
+ len = 0;
+ orig_len = len;
if (len <= 0) {
/*
* If FIN has been sent but not acked, but we haven't been
@@ -7481,10 +8662,68 @@
len = 0;
if ((tp->snd_wnd == 0) &&
(TCPS_HAVEESTABLISHED(tp->t_state)) &&
+ (tp->snd_una == tp->snd_max) &&
(sb_offset < (int)sbavail(sb))) {
tp->snd_nxt = tp->snd_una;
rack_enter_persist(tp, rack, cts);
}
+ } else if ((rsm == NULL) &&
+ ((doing_tlp == 0) || (new_data_tlp == 1)) &&
+ (len < rack->r_ctl.rc_pace_max_segs)) {
+ /*
+ * We are not sending a full segment for
+ * some reason. Should we not send anything (think
+ * sws or persists)?
+ */
+ if ((tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
+ (TCPS_HAVEESTABLISHED(tp->t_state)) &&
+ (len < (int)(sbavail(sb) - sb_offset))) {
+ /*
+ * Here the rwnd is less than
+ * the pacing size, this is not a retransmit,
+ * we are established and
+ * the send is not the last in the socket buffer
+ * we send nothing, and may enter persists.
+ */
+ len = 0;
+ if (tp->snd_max == tp->snd_una) {
+ /*
+ * Nothing out we can
+ * go into persists.
+ */
+ rack_enter_persist(tp, rack, cts);
+ tp->snd_nxt = tp->snd_una;
+ }
+ } else if ((tp->snd_cwnd >= max(rack->r_ctl.rc_pace_min_segs, (maxseg * 4))) &&
+ (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * maxseg)) &&
+ (len < (int)(sbavail(sb) - sb_offset)) &&
+ (len < rack->r_ctl.rc_pace_min_segs)) {
+ /*
+ * Here we are not retransmitting, and
+ * the cwnd is not so small that we could
+ * not send at least a min size (rxt timer
+ * not having gone off), We have 2 segments or
+ * more already in flight, its not the tail end
+ * of the socket buffer and the cwnd is blocking
+ * us from sending out a minimum pacing segment size.
+ * Lets not send anything.
+ */
+ len = 0;
+ } else if (((tp->snd_wnd - ctf_outstanding(tp)) <
+ min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
+ (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * maxseg)) &&
+ (len < (int)(sbavail(sb) - sb_offset)) &&
+ (TCPS_HAVEESTABLISHED(tp->t_state))) {
+ /*
+ * Here we have a send window but we have
+ * filled it up and we can't send another pacing segment.
+ * We also have in flight more than 2 segments
+ * and we are not completing the sb i.e. we allow
+ * the last bytes of the sb to go out even if
+ * its not a full pacing segment.
+ */
+ len = 0;
+ }
}
/* len will be >= 0 after this point. */
KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
@@ -7537,10 +8776,8 @@
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
ipoptlen += ipsec_optlen;
#endif
- if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > tp->t_maxseg &&
-#ifdef NETFLIX_TCP_O_UDP
+ if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > ctf_fixed_maxseg(tp) &&
(tp->t_port == 0) &&
-#endif
((tp->t_flags & TF_SIGNATURE) == 0) &&
tp->rcv_numsacks == 0 && sack_rxmit == 0 &&
ipoptlen == 0)
@@ -7556,16 +8793,7 @@
*/
outstanding--;
}
- if (outstanding > 0) {
- /*
- * This is sub-optimal. We only send a stand alone
- * FIN on its own segment.
- */
- if (flags & TH_FIN) {
- flags &= ~TH_FIN;
- would_have_fin = 1;
- }
- } else if (sack_rxmit) {
+ if (sack_rxmit) {
if ((rsm->r_flags & RACK_HAS_FIN) == 0)
flags &= ~TH_FIN;
} else {
@@ -7587,7 +8815,7 @@
* limited the window size) - we need to retransmit
*/
if (len) {
- if (len >= tp->t_maxseg) {
+ if (len >= ctf_fixed_maxseg(tp)) {
pass = 1;
goto send;
}
@@ -7677,10 +8905,10 @@
if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale)
goto dontupdate;
- if (adv >= (int32_t)(2 * tp->t_maxseg) &&
+ if (adv >= (int32_t)(2 * ctf_fixed_maxseg(tp)) &&
(adv >= (int32_t)(so->so_rcv.sb_hiwat / 4) ||
recwin <= (int32_t)(so->so_rcv.sb_hiwat / 8) ||
- so->so_rcv.sb_hiwat <= 8 * tp->t_maxseg)) {
+ so->so_rcv.sb_hiwat <= 8 * ctf_fixed_maxseg(tp))) {
pass = 7;
goto send;
}
@@ -7709,13 +8937,10 @@
* If our state indicates that FIN should be sent and we have not
* yet done so, then we need to send.
*/
- if (flags & TH_FIN) {
- if ((tp->t_flags & TF_SENTFIN) ||
- (((tp->t_flags & TF_SENTFIN) == 0) &&
- (tp->snd_nxt == tp->snd_una))) {
- pass = 11;
- goto send;
- }
+ if ((flags & TH_FIN) &&
+ (tp->snd_nxt == tp->snd_una)) {
+ pass = 11;
+ goto send;
}
/*
* No reason to send a segment, just return.
@@ -7725,12 +8950,38 @@
just_return_nolock:
if (tot_len_this_send == 0)
counter_u64_add(rack_out_size[TCP_MSS_ACCT_JUSTRET], 1);
- rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, tot_len_this_send, 1);
+ if (slot) {
+ /* set the rack tcb into the slot N */
+ counter_u64_add(rack_paced_segments, 1);
+ } else if (tot_len_this_send) {
+ counter_u64_add(rack_unpaced_segments, 1);
+ }
+ /* Check if we need to go into persists or not */
+ if ((rack->rc_in_persist == 0) &&
+ (tp->snd_max == tp->snd_una) &&
+ TCPS_HAVEESTABLISHED(tp->t_state) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd) &&
+ (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd) &&
+ (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs))) {
+ /* Yes lets make sure to move to persist before timer-start */
+ rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
+ }
+ rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, sup_rack);
rack_log_type_just_return(rack, cts, tot_len_this_send, slot, hpts_calling);
tp->t_flags &= ~TF_FORCEDATA;
return (0);
send:
+ if ((flags & TH_FIN) &&
+ sbavail(&tp->t_inpcb->inp_socket->so_snd)) {
+ /*
+ * We do not transmit a FIN
+ * with data outstanding. We
+ * need to make it so all data
+ * is acked first.
+ */
+ flags &= ~TH_FIN;
+ }
if (doing_tlp == 0) {
/*
* Data not a TLP, and its not the rxt firing. If it is the
@@ -7743,7 +8994,7 @@
}
SOCKBUF_LOCK_ASSERT(sb);
if (len > 0) {
- if (len >= tp->t_maxseg)
+ if (len >= ctf_fixed_maxseg(tp))
tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT;
else
tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT;
@@ -7774,27 +9025,44 @@
if (flags & TH_SYN) {
tp->snd_nxt = tp->iss;
to.to_mss = tcp_mssopt(&inp->inp_inc);
-#ifdef NETFLIX_TCP_O_UDP
+#ifdef NETFLIX_TCPOUDP
if (tp->t_port)
to.to_mss -= V_tcp_udp_tunneling_overhead;
#endif
to.to_flags |= TOF_MSS;
-#ifdef TCP_RFC7413
+
/*
- * Only include the TFO option on the first
- * transmission of the SYN|ACK on a
- * passively-created TFO socket, as the presence of
- * the TFO option may have caused the original
- * SYN|ACK to have been dropped by a middlebox.
+ * On SYN or SYN|ACK transmits on TFO connections,
+ * only include the TFO option if it is not a
+ * retransmit, as the presence of the TFO option may
+ * have caused the original SYN or SYN|ACK to have
+ * been dropped by a middlebox.
*/
- if ((tp->t_flags & TF_FASTOPEN) &&
- (tp->t_state == TCPS_SYN_RECEIVED) &&
+ if (IS_FASTOPEN(tp->t_flags) &&
(tp->t_rxtshift == 0)) {
- to.to_tfo_len = TCP_FASTOPEN_MAX_COOKIE_LEN;
- to.to_tfo_cookie = (u_char *)&tp->t_tfo_cookie;
- to.to_flags |= TOF_FASTOPEN;
+ if (tp->t_state == TCPS_SYN_RECEIVED) {
+ to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN;
+ to.to_tfo_cookie =
+ (u_int8_t *)&tp->t_tfo_cookie.server;
+ to.to_flags |= TOF_FASTOPEN;
+ wanted_cookie = 1;
+ } else if (tp->t_state == TCPS_SYN_SENT) {
+ to.to_tfo_len =
+ tp->t_tfo_client_cookie_len;
+ to.to_tfo_cookie =
+ tp->t_tfo_cookie.client;
+ to.to_flags |= TOF_FASTOPEN;
+ wanted_cookie = 1;
+ /*
+ * If we wind up having more data to
+ * send with the SYN than can fit in
+ * one segment, don't send any more
+ * until the SYN|ACK comes back from
+ * the other end.
+ */
+ sendalot = 0;
+ }
}
-#endif
}
/* Window scaling. */
if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) {
@@ -7829,8 +9097,15 @@
/* Processing the options. */
hdrlen += optlen = tcp_addoptions(&to, opt);
+ /*
+ * If we wanted a TFO option to be added, but it was unable
+ * to fit, ensure no data is sent.
+ */
+ if (IS_FASTOPEN(tp->t_flags) && wanted_cookie &&
+ !(to.to_flags & TOF_FASTOPEN))
+ len = 0;
}
-#ifdef NETFLIX_TCP_O_UDP
+#ifdef NETFLIX_TCPOUDP
if (tp->t_port) {
if (V_tcp_udp_tunneling_port == 0) {
/* The port was removed?? */
@@ -7854,16 +9129,18 @@
ipoptlen += ipsec_optlen;
#endif
+#ifdef KERN_TLS
+ /* force TSO for so TLS offload can get mss */
+ if (sb->sb_flags & SB_TLS_IFNET) {
+ force_tso = 1;
+ }
+#endif
/*
* Adjust data length if insertion of options will bump the packet
* length beyond the t_maxseg length. Clear the FIN bit because we
* cut off the tail of the segment.
*/
if (len + optlen + ipoptlen > tp->t_maxseg) {
- if (flags & TH_FIN) {
- would_have_fin = 1;
- flags &= ~TH_FIN;
- }
if (tso) {
uint32_t if_hw_tsomax;
uint32_t moff;
@@ -7896,18 +9173,19 @@
* unless the send sockbuf can be emptied:
*/
max_len = (tp->t_maxseg - optlen);
- if ((sb_offset + len) < sbavail(sb)) {
+ if (((sb_offset + len) < sbavail(sb)) &&
+ (hw_tls == 0)) {
moff = len % (u_int)max_len;
if (moff != 0) {
len -= moff;
sendalot = 1;
}
- }
- /*
+ }
+ /*
* In case there are too many small fragments don't
* use TSO:
*/
- if (len <= max_len) {
+ if (len <= maxseg) {
len = max_len;
sendalot = 1;
tso = 0;
@@ -7974,9 +9252,11 @@
uint32_t moff;
if (rack->rc_pace_max_segs)
- max_val = rack->rc_pace_max_segs * tp->t_maxseg;
+ max_val = rack->rc_pace_max_segs * ctf_fixed_maxseg(tp);
else
max_val = len;
+ if (rack->r_ctl.rc_pace_max_segs < max_val)
+ max_val = rack->r_ctl.rc_pace_max_segs;
/*
* We allow a limit on sending with hptsi.
*/
@@ -8017,9 +9297,17 @@
msb = NULL;
else
msb = sb;
- m->m_next = tcp_m_copym(/*tp, */ mb, moff, &len,
- if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb,
- hw_tls /*, NULL */);
+ m->m_next = tcp_m_copym(
+#ifdef NETFLIX_COPY_ARGS
+ tp,
+#endif
+ mb, moff, &len,
+ if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb,
+ ((rsm == NULL) ? hw_tls : 0)
+#ifdef NETFLIX_COPY_ARGS
+ , &filled_all
+#endif
+ );
if (len <= (tp->t_maxseg - optlen)) {
/*
* Must have ran out of mbufs for the copy
@@ -8053,8 +9341,6 @@
* TLP should not count in retran count, but
* in its own bin
*/
-/* tp->t_sndtlppack++;*/
-/* tp->t_sndtlpbyte += len;*/
counter_u64_add(rack_tlp_retran, 1);
counter_u64_add(rack_tlp_retran_bytes, len);
} else {
@@ -8085,7 +9371,7 @@
flags |= TH_PUSH;
/*
- * Are we doing hptsi, if so we must calculate the slot. We
+ * Are we doing pacing, if so we must calculate the slot. We
* only do hptsi in ESTABLISHED and with no RESET being
* sent where we have data to send.
*/
@@ -8094,56 +9380,10 @@
((tp->t_state == TCPS_FIN_WAIT_1) &&
((tp->t_flags & TF_SENTFIN) == 0) &&
((flags & TH_FIN) == 0))) &&
- ((flags & TH_RST) == 0) &&
- (rack->rc_always_pace)) {
- /*
- * We use the most optimistic possible cwnd/srtt for
- * sending calculations. This will make our
- * calculation anticipate getting more through
- * quicker then possible. But thats ok we don't want
- * the peer to have a gap in data sending.
- */
- uint32_t srtt, cwnd, tr_perms = 0;
-
- if (rack->r_ctl.rc_rack_min_rtt)
- srtt = rack->r_ctl.rc_rack_min_rtt;
- else
- srtt = TICKS_2_MSEC((tp->t_srtt >> TCP_RTT_SHIFT));
- if (rack->r_ctl.rc_rack_largest_cwnd)
- cwnd = rack->r_ctl.rc_rack_largest_cwnd;
- else
- cwnd = tp->snd_cwnd;
- tr_perms = cwnd / srtt;
- if (tr_perms == 0) {
- tr_perms = tp->t_maxseg;
- }
+ ((flags & TH_RST) == 0)) {
+ /* Get our pacing rate */
tot_len_this_send += len;
- /*
- * Calculate how long this will take to drain, if
- * the calculation comes out to zero, thats ok we
- * will use send_a_lot to possibly spin around for
- * more increasing tot_len_this_send to the point
- * that its going to require a pace, or we hit the
- * cwnd. Which in that case we are just waiting for
- * a ACK.
- */
- slot = tot_len_this_send / tr_perms;
- /* Now do we reduce the time so we don't run dry? */
- if (slot && rack->rc_pace_reduce) {
- int32_t reduce;
-
- reduce = (slot / rack->rc_pace_reduce);
- if (reduce < slot) {
- slot -= reduce;
- } else
- slot = 0;
- }
- if (rack->r_enforce_min_pace &&
- (slot == 0) &&
- (tot_len_this_send >= (rack->r_min_pace_seg_thresh * tp->t_maxseg))) {
- /* We are enforcing a minimum pace time of 1ms */
- slot = rack->r_enforce_min_pace;
- }
+ slot = rack_get_pacing_delay(rack, tp, tot_len_this_send);
}
SOCKBUF_UNLOCK(sb);
} else {
@@ -8180,7 +9420,7 @@
#ifdef INET6
if (isipv6) {
ip6 = mtod(m, struct ip6_hdr *);
-#ifdef NETFLIX_TCP_O_UDP
+#ifdef NETFLIX_TCPOUDP
if (tp->t_port) {
udp = (struct udphdr *)((caddr_t)ip6 + ipoptlen + sizeof(struct ip6_hdr));
udp->uh_sport = htons(V_tcp_udp_tunneling_port);
@@ -8188,10 +9428,14 @@
ulen = hdrlen + len - sizeof(struct ip6_hdr);
udp->uh_ulen = htons(ulen);
th = (struct tcphdr *)(udp + 1);
- } else
+ } else
#endif
th = (struct tcphdr *)(ip6 + 1);
- tcpip_fillheaders(inp, /*tp->t_port, */ ip6, th);
+ tcpip_fillheaders(inp,
+#ifdef NETFLIX_TCPOUDP
+ tp->t_port,
+#endif
+ ip6, th);
} else
#endif /* INET6 */
{
@@ -8199,7 +9443,7 @@
#ifdef TCPDEBUG
ipov = (struct ipovly *)ip;
#endif
-#ifdef NETFLIX_TCP_O_UDP
+#ifdef NETFLIX_TCPOUDP
if (tp->t_port) {
udp = (struct udphdr *)((caddr_t)ip + ipoptlen + sizeof(struct ip));
udp->uh_sport = htons(V_tcp_udp_tunneling_port);
@@ -8210,7 +9454,11 @@
} else
#endif
th = (struct tcphdr *)(ip + 1);
- tcpip_fillheaders(inp,/*tp->t_port, */ ip, th);
+ tcpip_fillheaders(inp,
+#ifdef NETFLIX_TCPOUDP
+ tp->t_port,
+#endif
+ ip, th);
}
/*
* Fill in fields, remembering maximum advertised window for use in
@@ -8301,15 +9549,20 @@
/*
* Calculate receive window. Don't shrink window, but avoid silly
* window syndrome.
+ * If a RST segment is sent, advertise a window of zero.
*/
- if (recwin < (long)(so->so_rcv.sb_hiwat / 4) &&
- recwin < (long)tp->t_maxseg)
+ if (flags & TH_RST) {
recwin = 0;
- if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
- recwin < (long)(tp->rcv_adv - tp->rcv_nxt))
- recwin = (long)(tp->rcv_adv - tp->rcv_nxt);
- if (recwin > (long)TCP_MAXWIN << tp->rcv_scale)
- recwin = (long)TCP_MAXWIN << tp->rcv_scale;
+ } else {
+ if (recwin < (long)(so->so_rcv.sb_hiwat / 4) &&
+ recwin < (long)ctf_fixed_maxseg(tp))
+ recwin = 0;
+ if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
+ recwin < (long)(tp->rcv_adv - tp->rcv_nxt))
+ recwin = (long)(tp->rcv_adv - tp->rcv_nxt);
+ if (recwin > (long)TCP_MAXWIN << tp->rcv_scale)
+ recwin = (long)TCP_MAXWIN << tp->rcv_scale;
+ }
/*
* According to RFC1323 the window field in a SYN (i.e., a <SYN> or
@@ -8376,7 +9629,6 @@
* ip6_plen is not need to be filled now, and will be filled
* in ip6_output.
*/
-#ifdef NETFLIX_TCP_O_UDP
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
@@ -8384,15 +9636,12 @@
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
-#endif
m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in6_cksum_pseudo(ip6,
sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
0);
-#ifdef NETFLIX_TCP_O_UDP
}
-#endif
}
#endif
#if defined(INET6) && defined(INET)
@@ -8400,7 +9649,6 @@
#endif
#ifdef INET
{
-#ifdef NETFLIX_TCP_O_UDP
if (tp->t_port) {
m->m_pkthdr.csum_flags = CSUM_UDP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
@@ -8409,28 +9657,24 @@
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
-#endif
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
th->th_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
IPPROTO_TCP + len + optlen));
-#ifdef NETFLIX_TCP_O_UDP
}
-#endif
/* IP version must be set here for ipv4/ipv6 checking later */
KASSERT(ip->ip_v == IPVERSION,
("%s: IP version incorrect: %d", __func__, ip->ip_v));
}
#endif
-
/*
* Enable TSO and specify the size of the segments. The TCP pseudo
* header checksum is always provided. XXX: Fixme: This is currently
* not the case for IPv6.
*/
- if (tso) {
- KASSERT(len > tp->t_maxseg - optlen,
+ if (tso || force_tso) {
+ KASSERT(force_tso || len > tp->t_maxseg - optlen,
("%s: len <= tso_segsz", __func__));
m->m_pkthdr.csum_flags |= CSUM_TSO;
m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen;
@@ -8443,7 +9687,6 @@
/* Run HHOOK_TCP_ESTABLISHED_OUT helper hooks. */
hhook_run_tcp_est_out(tp, th, &to, len, tso);
#endif
-
#ifdef TCPDEBUG
/*
* Trace.
@@ -8470,18 +9713,29 @@
/* We're getting ready to send; log now. */
if (tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
+ struct timeval tv;
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
log.u_bbr.ininput = rack->rc_inp->inp_in_input;
log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
+ log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
+ log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex4 = orig_len;
+ if (filled_all)
+ log.u_bbr.flex5 = 0x80000000;
+ else
+ log.u_bbr.flex5 = 0;
if (rsm || sack_rxmit) {
log.u_bbr.flex8 = 1;
} else {
log.u_bbr.flex8 = 0;
}
+ log.u_bbr.pkts_out = tp->t_maxseg;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK,
- len, &log, false, NULL, NULL, 0, NULL);
+ len, &log, false, NULL, NULL, 0, &tv);
} else
lgb = NULL;
@@ -8585,7 +9839,7 @@
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(tp->t_flags & TF_SACK_PERMIT) &&
tp->rcv_numsacks > 0)
- tcp_clean_dsack_blocks(tp);
+ tcp_clean_dsack_blocks(tp);
if (len == 0)
counter_u64_add(rack_out_size[TCP_MSS_ACCT_SNDACK], 1);
else if (len == 1) {
@@ -8593,12 +9847,38 @@
} else if (len > 1) {
int idx;
- idx = (len / tp->t_maxseg) + 3;
+ idx = (len / ctf_fixed_maxseg(tp)) + 3;
if (idx >= TCP_MSS_ACCT_ATIMER)
counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
else
counter_u64_add(rack_out_size[idx], 1);
}
+ if (hw_tls && len > 0) {
+ if (filled_all) {
+ counter_u64_add(rack_tls_filled, 1);
+ rack_log_type_hrdwtso(tp, rack, len, 0, orig_len, 1);
+ } else {
+ if (rsm) {
+ counter_u64_add(rack_tls_rxt, 1);
+ rack_log_type_hrdwtso(tp, rack, len, 2, orig_len, 1);
+ } else if (doing_tlp) {
+ counter_u64_add(rack_tls_tlp, 1);
+ rack_log_type_hrdwtso(tp, rack, len, 3, orig_len, 1);
+ } else if ( (ctf_outstanding(tp) + rack->r_ctl.rc_pace_min_segs) > sbavail(sb)) {
+ counter_u64_add(rack_tls_app, 1);
+ rack_log_type_hrdwtso(tp, rack, len, 4, orig_len, 1);
+ } else if ((ctf_flight_size(tp, rack->r_ctl.rc_sacked) + rack->r_ctl.rc_pace_min_segs) > tp->snd_cwnd) {
+ counter_u64_add(rack_tls_cwnd, 1);
+ rack_log_type_hrdwtso(tp, rack, len, 5, orig_len, 1);
+ } else if ((ctf_outstanding(tp) + rack->r_ctl.rc_pace_min_segs) > tp->snd_wnd) {
+ counter_u64_add(rack_tls_rwnd, 1);
+ rack_log_type_hrdwtso(tp, rack, len, 6, orig_len, 1);
+ } else {
+ rack_log_type_hrdwtso(tp, rack, len, 7, orig_len, 1);
+ counter_u64_add(rack_tls_other, 1);
+ }
+ }
+ }
}
if (sub_from_prr && (error == 0)) {
if (rack->r_ctl.rc_prr_sndcnt >= len)
@@ -8609,17 +9889,20 @@
sub_from_prr = 0;
rack_log_output(tp, &to, len, rack_seq, (uint8_t) flags, error, cts,
pass, rsm);
+ if ((error == 0) &&
+ (len > 0) &&
+ (tp->snd_una == tp->snd_max))
+ rack->r_ctl.rc_tlp_rxt_last_time = cts;
if ((tp->t_flags & TF_FORCEDATA) == 0 ||
(rack->rc_in_persist == 0)) {
-#ifdef NETFLIX_STATS
tcp_seq startseq = tp->snd_nxt;
-#endif
+
/*
* Advance snd_nxt over sequence space of this segment.
*/
if (error)
/* We don't log or do anything with errors */
- goto timer;
+ goto nomore;
if (flags & (TH_SYN | TH_FIN)) {
if (flags & TH_SYN)
@@ -8631,7 +9914,7 @@
}
/* In the ENOBUFS case we do *not* update snd_max */
if (sack_rxmit)
- goto timer;
+ goto nomore;
tp->snd_nxt += len;
if (SEQ_GT(tp->snd_nxt, tp->snd_max)) {
@@ -8644,6 +9927,17 @@
tp->t_acktime = ticks;
}
tp->snd_max = tp->snd_nxt;
+ /*
+ * Time this transmission if not a retransmission and
+ * not currently timing anything.
+ * This is only relevant in case of switching back to
+ * the base stack.
+ */
+ if (tp->t_rtttime == 0) {
+ tp->t_rtttime = ticks;
+ tp->t_rtseq = startseq;
+ TCPSTAT_INC(tcps_segstimed);
+ }
#ifdef NETFLIX_STATS
if (!(tp->t_flags & TF_GPUTINPROG) && len) {
tp->t_flags |= TF_GPUTINPROG;
@@ -8654,26 +9948,6 @@
}
#endif
}
- /*
- * Set retransmit timer if not currently set, and not doing
- * a pure ack or a keep-alive probe. Initial value for
- * retransmit timer is smoothed round-trip time + 2 *
- * round-trip time variance. Initialize shift counter which
- * is used for backoff of retransmit time.
- */
-timer:
- if ((tp->snd_wnd == 0) &&
- TCPS_HAVEESTABLISHED(tp->t_state)) {
- /*
- * If the persists timer was set above (right before
- * the goto send), and still needs to be on. Lets
- * make sure all is canceled. If the persist timer
- * is not running, we want to get it up.
- */
- if (rack->rc_in_persist == 0) {
- rack_enter_persist(tp, rack, cts);
- }
- }
} else {
/*
* Persist case, update snd_max but since we are in persist
@@ -8755,7 +10029,7 @@
goto again;
}
slot = 10;
- rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, 0, 1);
+ rack_start_hpts_timer(rack, tp, cts, slot, 0, 0);
tp->t_flags &= ~TF_FORCEDATA;
return (error);
case ENETUNREACH:
@@ -8769,7 +10043,7 @@
/* FALLTHROUGH */
default:
slot = 10;
- rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, 0, 1);
+ rack_start_hpts_timer(rack, tp, cts, slot, 0, 0);
tp->t_flags &= ~TF_FORCEDATA;
return (error);
}
@@ -8789,15 +10063,22 @@
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
enobufs:
rack->r_tlp_running = 0;
- if ((flags & TH_RST) || (would_have_fin == 1)) {
+ if (flags & TH_RST) {
/*
- * We don't send again after a RST. We also do *not* send
- * again if we would have had a find, but now have
- * outstanding data.
+ * We don't send again after sending a RST.
*/
slot = 0;
sendalot = 0;
}
+ if (rsm && (slot == 0)) {
+ /*
+ * Dup ack retransmission possibly, so
+ * lets assure we have at least min rack
+ * time, if its a rack resend then the rack
+ * to will also be set to this.
+ */
+ slot = rack->r_ctl.rc_min_to;
+ }
if (slot) {
/* set the rack tcb into the slot N */
counter_u64_add(rack_paced_segments, 1);
@@ -8811,7 +10092,7 @@
counter_u64_add(rack_unpaced_segments, 1);
}
tp->t_flags &= ~TF_FORCEDATA;
- rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, tot_len_this_send, 1);
+ rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, 0);
return (error);
}
@@ -8847,8 +10128,10 @@
case TCP_RACK_TLP_INC_VAR:
case TCP_RACK_IDLE_REDUCE_HIGH:
case TCP_RACK_MIN_PACE:
- case TCP_RACK_MIN_PACE_SEG:
+ case TCP_RACK_GP_INCREASE:
case TCP_BBR_RACK_RTT_USE:
+ case TCP_BBR_USE_RACK_CHEAT:
+ case TCP_RACK_DO_DETECTION:
case TCP_DATA_AFTER_CLOSE:
break;
default:
@@ -8867,6 +10150,13 @@
tp = intotcpcb(inp);
rack = (struct tcp_rack *)tp->t_fb_ptr;
switch (sopt->sopt_name) {
+ case TCP_RACK_DO_DETECTION:
+ RACK_OPTS_INC(tcp_rack_no_sack);
+ if (optval == 0)
+ rack->do_detection = 0;
+ else
+ rack->do_detection = 1;
+ break;
case TCP_RACK_PROP_RATE:
if ((optval <= 0) || (optval >= 100)) {
error = EINVAL;
@@ -8919,6 +10209,7 @@
/* Max segments in a pace */
RACK_OPTS_INC(tcp_rack_max_seg);
rack->rc_pace_max_segs = optval;
+ rack_set_pace_segments(tp, rack);
break;
case TCP_RACK_PRR_SENDALOT:
/* Allow PRR to send more than one seg */
@@ -8956,6 +10247,13 @@
else
error = EINVAL;
break;
+ case TCP_BBR_USE_RACK_CHEAT:
+ RACK_OPTS_INC(tcp_rack_cheat);
+ if (optval)
+ rack->use_rack_cheat = 1;
+ else
+ rack->use_rack_cheat = 0;
+ break;
case TCP_RACK_PKT_DELAY:
/* RACK added ms i.e. rack-rtt + reord + N */
RACK_OPTS_INC(tcp_rack_pkt_delay);
@@ -8963,15 +10261,10 @@
break;
case TCP_RACK_TLP_INC_VAR:
/* Does TLP include rtt variance in t-o */
- RACK_OPTS_INC(tcp_rack_tlp_inc_var);
- rack->r_ctl.rc_prr_inc_var = optval;
+ return (EINVAL);
break;
case TCP_RACK_IDLE_REDUCE_HIGH:
- RACK_OPTS_INC(tcp_rack_idle_reduce_high);
- if (optval)
- rack->r_idle_reduce_largest = 1;
- else
- rack->r_idle_reduce_largest = 0;
+ return (EINVAL);
break;
case TCP_DELACK:
if (optval == 0)
@@ -8991,12 +10284,13 @@
else
rack->r_enforce_min_pace = optval;
break;
- case TCP_RACK_MIN_PACE_SEG:
- RACK_OPTS_INC(tcp_rack_min_pace_seg);
- if (optval >= 16)
- rack->r_min_pace_seg_thresh = 15;
+ case TCP_RACK_GP_INCREASE:
+ if ((optval >= 0) &&
+ (optval <= 256))
+ rack->rack_per_of_gp = optval;
else
- rack->r_min_pace_seg_thresh = optval;
+ error = EINVAL;
+
break;
case TCP_BBR_RACK_RTT_USE:
if ((optval != USE_RTT_HIGH) &&
@@ -9016,7 +10310,9 @@
return (tcp_default_ctloutput(so, sopt, inp, tp));
break;
}
-/* tcp_log_socket_option(tp, sopt->sopt_name, optval, error);*/
+#ifdef NETFLIX_STATS
+ tcp_log_socket_option(tp, sopt->sopt_name, optval, error);
+#endif
INP_WUNLOCK(inp);
return (error);
}
@@ -9034,6 +10330,10 @@
* impact to this routine.
*/
switch (sopt->sopt_name) {
+ case TCP_RACK_DO_DETECTION:
+ optval = rack->do_detection;
+ break;
+
case TCP_RACK_PROP_RATE:
optval = rack->r_ctl.rc_prop_rate;
break;
@@ -9081,6 +10381,10 @@
/* Does reordering fade after ms time */
optval = rack->r_ctl.rc_reorder_fade;
break;
+ case TCP_BBR_USE_RACK_CHEAT:
+ /* Do we use the rack cheat for rxt */
+ optval = rack->use_rack_cheat;
+ break;
case TCP_RACK_TLP_THRESH:
/* RACK TLP theshold i.e. srtt+(srtt/N) */
optval = rack->r_ctl.rc_tlp_threshold;
@@ -9094,16 +10398,16 @@
break;
case TCP_RACK_TLP_INC_VAR:
/* Does TLP include rtt variance in t-o */
- optval = rack->r_ctl.rc_prr_inc_var;
+ return (EINVAL);
break;
case TCP_RACK_IDLE_REDUCE_HIGH:
- optval = rack->r_idle_reduce_largest;
+ return (EINVAL);
break;
case TCP_RACK_MIN_PACE:
optval = rack->r_enforce_min_pace;
break;
- case TCP_RACK_MIN_PACE_SEG:
- optval = rack->r_min_pace_seg_thresh;
+ case TCP_RACK_GP_INCREASE:
+ optval = rack->rack_per_of_gp;
break;
case TCP_BBR_RACK_RTT_USE:
optval = rack->r_ctl.rc_rate_sample_method;
@@ -9145,9 +10449,11 @@
}
-struct tcp_function_block __tcp_rack = {
+static struct tcp_function_block __tcp_rack = {
.tfb_tcp_block_name = __XSTRING(STACKNAME),
.tfb_tcp_output = rack_output,
+ .tfb_do_queued_segments = ctf_do_queued_segments,
+ .tfb_do_segment_nounlock = rack_do_segment_nounlock,
.tfb_tcp_do_segment = rack_do_segment,
.tfb_tcp_ctloutput = rack_ctloutput,
.tfb_tcp_fb_init = rack_init,
@@ -9202,7 +10508,11 @@
rack_sysctl_root = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_net_inet_tcp),
OID_AUTO,
+#ifdef STACKALIAS
+ __XSTRING(STACKALIAS),
+#else
__XSTRING(STACKNAME),
+#endif
CTLFLAG_RW, 0,
"");
if (rack_sysctl_root == NULL) {
@@ -9226,6 +10536,7 @@
printf("Failed to register rack module -- err:%d\n", err);
return (err);
}
+ tcp_lro_reg_mbufq();
rack_mod_inited = true;
break;
case MOD_QUIESCE:
@@ -9242,6 +10553,7 @@
rack_counter_destroy();
rack_mod_inited = false;
}
+ tcp_lro_dereg_mbufq();
err = 0;
break;
default:
Index: head/sys/netinet/tcp_stacks/rack_bbr_common.h
===================================================================
--- head/sys/netinet/tcp_stacks/rack_bbr_common.h
+++ head/sys/netinet/tcp_stacks/rack_bbr_common.h
@@ -1,7 +1,7 @@
#ifndef __pacer_timer_h__
#define __pacer_timer_h__
/*-
- * Copyright (c) 2017 Netflix, Inc.
+ * Copyright (c) 2017-9 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
Index: head/sys/netinet/tcp_stacks/rack_bbr_common.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack_bbr_common.c
+++ head/sys/netinet/tcp_stacks/rack_bbr_common.c
@@ -40,7 +40,7 @@
#include "opt_ipsec.h"
#include "opt_tcpdebug.h"
#include "opt_ratelimit.h"
-/*#include "opt_kern_tls.h"*/
+#include "opt_kern_tls.h"
#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
@@ -50,20 +50,25 @@
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
+#include <sys/qmath.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#ifdef KERN_TLS
-#include <sys/sockbuf_tls.h>
+#include <sys/ktls.h>
#endif
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/tree.h>
+#ifdef NETFLIX_STATS
+#include <sys/stats.h> /* Must come after qmath.h and tree.h */
+#endif
#include <sys/refcount.h>
#include <sys/queue.h>
#include <sys/smp.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
+#include <sys/tim_filter.h>
#include <sys/time.h>
#include <vm/uma.h>
#include <sys/kern_prefetch.h>
@@ -85,6 +90,7 @@
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
+#define TCPOUTFLAGS
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
@@ -133,14 +139,14 @@
uint32_t
ctf_get_opt_tls_size(struct socket *so, uint32_t rwnd)
{
- struct sbtls_info *tls;
+ struct ktls_session *tls;
uint32_t len;
again:
tls = so->so_snd.sb_tls_info;
- len = tls->sb_params.sb_maxlen; /* max tls payload */
- len += tls->sb_params.sb_tls_hlen; /* tls header len */
- len += tls->sb_params.sb_tls_tlen; /* tls trailer len */
+ len = tls->params.max_frame_len; /* max tls payload */
+ len += tls->params.tls_hlen; /* tls header len */
+ len += tls->params.tls_tlen; /* tls trailer len */
if ((len * 4) > rwnd) {
/*
* Stroke this will suck counter and what
@@ -148,10 +154,10 @@
* TCP perspective I am not sure
* what should be done...
*/
- if (tls->sb_params.sb_maxlen > 4096) {
- tls->sb_params.sb_maxlen -= 4096;
- if (tls->sb_params.sb_maxlen < 4096)
- tls->sb_params.sb_maxlen = 4096;
+ if (tls->params.max_frame_len > 4096) {
+ tls->params.max_frame_len -= 4096;
+ if (tls->params.max_frame_len < 4096)
+ tls->params.max_frame_len = 4096;
goto again;
}
}
@@ -414,7 +420,13 @@
* have been called (if we can).
*/
m->m_pkthdr.lro_nsegs = 1;
- tcp_get_usecs(&tv);
+ if (m->m_flags & M_TSTMP_LRO) {
+ tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000;
+ tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000;
+ } else {
+ /* Should not be should we kassert instead? */
+ tcp_get_usecs(&tv);
+ }
/* Now what about next packet? */
if (m_save || has_pkt)
nxt_pkt = 1;
@@ -425,7 +437,7 @@
if (retval) {
/* We lost the lock and tcb probably */
m = m_save;
- while (m) {
+ while(m) {
m_save = m->m_nextpkt;
m->m_nextpkt = NULL;
m_freem(m);
@@ -434,7 +446,7 @@
if (no_vn == 0)
CURVNET_RESTORE();
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
- return (retval);
+ return(retval);
}
skipped_pkt:
m = m_save;
@@ -442,7 +454,7 @@
if (no_vn == 0)
CURVNET_RESTORE();
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
- return (retval);
+ return(retval);
}
int
@@ -457,7 +469,7 @@
tp->t_tail_pkt = NULL;
if (ctf_process_inbound_raw(tp, so, m, have_pkt)) {
/* We lost the tcpcb (maybe a RST came in)? */
- return (1);
+ return(1);
}
}
return (0);
@@ -466,14 +478,14 @@
uint32_t
ctf_outstanding(struct tcpcb *tp)
{
- return (tp->snd_max - tp->snd_una);
+ return(tp->snd_max - tp->snd_una);
}
uint32_t
ctf_flight_size(struct tcpcb *tp, uint32_t rc_sacked)
{
if (rc_sacked <= ctf_outstanding(tp))
- return (ctf_outstanding(tp) - rc_sacked);
+ return(ctf_outstanding(tp) - rc_sacked);
else {
/* TSNH */
#ifdef INVARIANTS
@@ -908,5 +920,5 @@
* count decay value.
*/
decayed_count = count - (uint32_t)perc_count;
- return (decayed_count);
+ return(decayed_count);
}
Index: head/sys/netinet/tcp_stacks/sack_filter.h
===================================================================
--- head/sys/netinet/tcp_stacks/sack_filter.h
+++ head/sys/netinet/tcp_stacks/sack_filter.h
@@ -1,7 +1,7 @@
#ifndef __sack_filter_h__
#define __sack_filter_h__
/*-
- * Copyright (c) 2017 Netflix, Inc.
+ * Copyright (c) 2017-9 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -50,7 +50,8 @@
};
#ifdef _KERNEL
void sack_filter_clear(struct sack_filter *sf, tcp_seq seq);
-int sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_seq th_ack);
-
+int sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks,
+ tcp_seq th_ack);
+void sack_filter_reject(struct sack_filter *sf, struct sackblk *in);
#endif
#endif
Index: head/sys/netinet/tcp_stacks/sack_filter.c
===================================================================
--- head/sys/netinet/tcp_stacks/sack_filter.c
+++ head/sys/netinet/tcp_stacks/sack_filter.c
@@ -1,5 +1,5 @@
/*-
- * Copyright (c) 2017 Netflix, Inc.
+ * Copyright (c) 2017-9 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -140,6 +140,7 @@
is_sack_on_board(struct sack_filter *sf, struct sackblk *b)
{
int32_t i, cnt;
+
for (i = sf->sf_cur, cnt=0; cnt < SACK_FILTER_BLOCKS; cnt++) {
if (sack_blk_used(sf, i)) {
if (SEQ_LT(b->start, sf->sf_ack)) {
@@ -150,8 +151,9 @@
/* End back behind too */
b->end = sf->sf_ack;
}
- if (b->start == b->end)
+ if (b->start == b->end) {
return(1);
+ }
/* Jonathans Rule 1 */
if (SEQ_LEQ(sf->sf_blks[i].start, b->start) &&
SEQ_GEQ(sf->sf_blks[i].end, b->end)) {
@@ -312,21 +314,22 @@
if (num == 0)
return(num);
- /* Now what we are left is either
+ /* Now what we are left with is either
* completely merged on to the board
- * from the above steps, or are new
+ * from the above steps, or is new
* and need to be added to the board
* with the last one updated to current.
*
- * First copy it out we want to return that
+ * First copy it out, we want to return that
* to our caller for processing.
*/
memcpy(in, blkboard, (num * sizeof(struct sackblk)));
numblks = num;
/* Now go through and add to our board as needed */
for(i=(num-1); i>=0; i--) {
- if (is_sack_on_board(sf, &blkboard[i]))
+ if (is_sack_on_board(sf, &blkboard[i])) {
continue;
+ }
/* Add this guy its not listed */
sf->sf_cur++;
sf->sf_cur %= SACK_FILTER_BLOCKS;
@@ -463,25 +466,60 @@
}
#ifndef _KERNEL
+uint64_t saved=0;
+uint64_t tot_sack_blks=0;
+
+static void
+sack_filter_dump(FILE *out, struct sack_filter *sf)
+{
+ int i;
+ fprintf(out, " sf_ack:%u sf_bits:0x%x c:%d used:%d\n",
+ sf->sf_ack, sf->sf_bits,
+ sf->sf_cur, sf->sf_used);
+
+ for(i=0; i<SACK_FILTER_BLOCKS; i++) {
+ if (sack_blk_used(sf, i)) {
+ fprintf(out, "Entry:%d start:%u end:%u\n", i,
+ sf->sf_blks[i].start,
+ sf->sf_blks[i].end);
+ }
+ }
+}
+#endif
+
+#ifndef _KERNEL
static
#endif
int
-sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_seq th_ack)
+sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks,
+ tcp_seq th_ack)
{
int32_t i, ret;
if (numblks > TCP_MAX_SACK) {
+#ifdef _KERNEL
panic("sf:%p sb:%p Impossible number of sack blocks %d > 4\n",
sf, in,
numblks);
+#endif
return(numblks);
}
+#ifndef _KERNEL
+ if ((sf->sf_used > 1) && (no_collapse == 0))
+ sack_board_collapse(sf);
+
+#else
+ if (sf->sf_used > 1)
+ sack_board_collapse(sf);
+#endif
if ((sf->sf_used == 0) && numblks) {
/*
* We are brand new add the blocks in
* reverse order. Note we can see more
* than one in new, since ack's could be lost.
*/
+ int cnt_added = 0;
+
sf->sf_ack = th_ack;
for(i=(numblks-1), sf->sf_cur=0; i >= 0; i--) {
memcpy(&sf->sf_blks[sf->sf_cur], &in[i], sizeof(struct sackblk));
@@ -489,6 +527,7 @@
sf->sf_cur++;
sf->sf_cur %= SACK_FILTER_BLOCKS;
sf->sf_used++;
+ cnt_added++;
#ifndef _KERNEL
if (sf->sf_used > highest_used)
highest_used = sf->sf_used;
@@ -496,7 +535,8 @@
}
if (sf->sf_cur)
sf->sf_cur--;
- return(numblks);
+
+ return (cnt_added);
}
if (SEQ_GT(th_ack, sf->sf_ack)) {
sack_filter_prune(sf, th_ack);
@@ -509,51 +549,82 @@
}
} else
ret = 0;
-#ifndef _KERNEL
- if ((sf->sf_used > 1) && (no_collapse == 0))
- sack_board_collapse(sf);
-
-#else
- if (sf->sf_used > 1)
- sack_board_collapse(sf);
-
-#endif
return (ret);
}
-#ifndef _KERNEL
-uint64_t saved=0;
-uint64_t tot_sack_blks=0;
-
-static void
-sack_filter_dump(FILE *out, struct sack_filter *sf)
+void
+sack_filter_reject(struct sack_filter *sf, struct sackblk *in)
{
+ /*
+ * Given a specified block (that had made
+ * it past the sack filter). Reject that
+ * block triming it off any sack-filter block
+ * that has it. Usually because the block was
+ * too small and did not cover a whole send.
+ *
+ * This function will only "undo" sack-blocks
+ * that are fresh and touch the edges of
+ * blocks in our filter.
+ */
int i;
- fprintf(out, " sf_ack:%u sf_bits:0x%x c:%d used:%d\n",
- sf->sf_ack, sf->sf_bits,
- sf->sf_cur, sf->sf_used);
for(i=0; i<SACK_FILTER_BLOCKS; i++) {
- if (sack_blk_used(sf, i)) {
- fprintf(out, "Entry:%d start:%u end:%u\n", i,
- sf->sf_blks[i].start,
- sf->sf_blks[i].end);
+ if (sack_blk_used(sf, i) == 0)
+ continue;
+ /*
+ * Now given the sack-filter block does it touch
+ * with one of the ends
+ */
+ if (sf->sf_blks[i].end == in->end) {
+ /* The end moves back to start */
+ if (SEQ_GT(in->start, sf->sf_blks[i].start))
+ /* in-blk |----| */
+ /* sf-blk |---------| */
+ sf->sf_blks[i].end = in->start;
+ else {
+ /* It consumes this block */
+ /* in-blk |---------| */
+ /* sf-blk |------| */
+ /* <or> */
+ /* sf-blk |---------| */
+ sf->sf_bits = sack_blk_clr(sf, i);
+ sf->sf_used--;
+ }
+ continue;
}
+ if (sf->sf_blks[i].start == in->start) {
+ if (SEQ_LT(in->end, sf->sf_blks[i].end)) {
+ /* in-blk |----| */
+ /* sf-blk |---------| */
+ sf->sf_blks[i].start = in->end;
+ } else {
+ /* It consumes this block */
+ /* in-blk |----------| */
+ /* sf-blk |-------| */
+ /* <or> */
+ /* sf-blk |----------| */
+ sf->sf_bits = sack_blk_clr(sf, i);
+ sf->sf_used--;
+ }
+ continue;
+ }
}
}
+#ifndef _KERNEL
+
int
main(int argc, char **argv)
{
char buffer[512];
struct sackblk blks[TCP_MAX_SACK];
FILE *err;
- tcp_seq th_ack, snd_una;
+ tcp_seq th_ack, snd_una, snd_max = 0;
struct sack_filter sf;
int32_t numblks,i;
int snd_una_set=0;
double a, b, c;
- int invalid_sack_print = 0;
+ int invalid_sack_print = 0;
uint32_t chg_remembered=0;
uint32_t sack_chg=0;
char line_buf[10][256];
@@ -604,7 +675,11 @@
line_buf_at++;
if (strncmp(buffer, "QUIT", 4) == 0) {
break;
- } else if (strncmp(buffer, "DONE", 4) == 0) {
+ } else if (strncmp(buffer, "DUMP", 4) == 0) {
+ sack_filter_dump(out, &sf);
+ } else if (strncmp(buffer, "MAX:", 4) == 0) {
+ snd_max = strtoul(&buffer[4], NULL, 0);
+ } else if (strncmp(buffer, "COMMIT", 6) == 0) {
int nn, ii;
if (numblks) {
uint32_t szof, tot_chg;
@@ -660,6 +735,7 @@
char *end=NULL;
uint32_t start;
uint32_t endv;
+
start = strtoul(&buffer[5], &end, 0);
if (end) {
endv = strtoul(&end[1], NULL, 0);
@@ -667,6 +743,8 @@
fprintf(out, "--Sack invalid skip 0 start:%u : ??\n", start);
continue;
}
+ if (SEQ_GT(endv, snd_max))
+ snd_max = endv;
if (SEQ_LT(endv, start)) {
fprintf(out, "--Sack invalid skip 1 endv:%u < start:%u\n", endv, start);
continue;
@@ -678,6 +756,28 @@
blks[numblks].start = start;
blks[numblks].end = endv;
numblks++;
+ } else if (strncmp(buffer, "REJ:n:n", 4) == 0) {
+ struct sackblk in;
+ char *end=NULL;
+
+ in.start = strtoul(&buffer[4], &end, 0);
+ if (end) {
+ in.end = strtoul(&end[1], NULL, 0);
+ sack_filter_reject(&sf, &in);
+ } else
+ fprintf(out, "Invalid input END:A:B\n");
+ } else if (strncmp(buffer, "HELP", 4) == 0) {
+ fprintf(out, "You can input:\n");
+ fprintf(out, "SACK:S:E -- to define a sack block\n");
+ fprintf(out, "RXT -- to clear the filter without changing the remembered\n");
+ fprintf(out, "EXIT -- To clear the sack filter and start all fresh\n");
+ fprintf(out, "ACK:N -- To advance the cum-ack to N\n");
+ fprintf(out, "MAX:N -- To set send-max to N\n");
+ fprintf(out, "COMMIT -- To apply the sack you built to the filter and dump the filter\n");
+ fprintf(out, "DUMP -- To display the current contents of the sack filter\n");
+ fprintf(out, "QUIT -- To exit this program\n");
+ } else {
+ fprintf(out, "Command %s unknown\n", buffer);
}
memset(buffer, 0, sizeof(buffer));
}
Index: head/sys/netinet/tcp_stacks/tcp_bbr.h
===================================================================
--- head/sys/netinet/tcp_stacks/tcp_bbr.h
+++ head/sys/netinet/tcp_stacks/tcp_bbr.h
@@ -0,0 +1,845 @@
+/*-
+ * Copyright (c) 2016-9
+ * Netflix Inc. All rights reserved.
+ * Author Randall R. Stewart
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _NETINET_TCP_BBR_H_
+#define _NETINET_TCP_BBR_H_
+
+#define BBR_INITIAL_RTO 1000000 /* 1 second in micro-seconds */
+/* Send map flags */
+#define BBR_ACKED 0x0001 /* The remote endpoint acked this */
+#define BBR_WAS_RENEGED 0x0002 /* The peer reneged the ack */
+#define BBR_RXT_CLEARED 0x0004 /* ACK Cleared by the RXT timer */
+#define BBR_OVERMAX 0x0008 /* We have more retran's then we can
+ * fit */
+#define BBR_SACK_PASSED 0x0010 /* A sack was done above this block */
+#define BBR_WAS_SACKPASS 0x0020 /* We retransmitted due to SACK pass */
+#define BBR_HAS_FIN 0x0040 /* segment is sent with fin */
+#define BBR_TLP 0x0080 /* segment sent as tail-loss-probe */
+#define BBR_HAS_SYN 0x0100 /* segment has the syn */
+#define BBR_MARKED_LOST 0x0200 /*
+ * This segments is lost and
+ * totaled into bbr->rc_ctl.rc_lost
+ */
+#define BBR_RWND_COLLAPSED 0x0400 /* The peer collapsed the rwnd on the segment */
+#define BBR_NUM_OF_RETRANS 7
+
+/* Defines for socket options to set pacing overheads */
+#define BBR_INCL_ENET_OH 0x01
+#define BBR_INCL_IP_OH 0x02
+#define BBR_INCL_TCP_OH 0x03
+
+/*
+ * With the addition of both measurement algorithms
+ * I had to move over the size of a
+ * cache line (unfortunately). For now there is
+ * no way around this. We may be able to cut back
+ * at some point I hope.
+ */
+struct bbr_sendmap {
+ TAILQ_ENTRY(bbr_sendmap) r_next; /* seq number arrayed next */
+ TAILQ_ENTRY(bbr_sendmap) r_tnext; /* Time of tmit based next */
+ uint32_t r_start; /* Sequence number of the segment */
+ uint32_t r_end; /* End seq, this is 1 beyond actually */
+
+ uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */
+ uint32_t r_delivered; /* Delivered amount at send */
+
+ uint32_t r_del_time; /* The time of the last delivery update */
+ uint8_t r_rtr_cnt:4, /* Retran count, index this -1 to get time
+ * sent */
+ unused_bit:1,
+ r_is_drain:1, /* In a draining cycle */
+ r_app_limited:1,/* We went app limited */
+ r_ts_valid:1; /* Timestamp field is valid (r_del_ack_ts) */
+ uint8_t r_dupack; /* Dup ack count */
+ uint8_t r_in_tmap:1, /* Flag to see if its in the r_tnext array */
+ r_is_smallmap:1,/* Was logged as a small-map send-map item */
+ r_is_gain:1, /* Was in gain cycle */
+ r_bbr_state:5; /* The BBR state at send */
+ uint8_t r_limit_type; /* is this entry counted against a limit? */
+
+ uint16_t r_flags; /* Flags as defined above */
+ uint16_t r_spare16;
+ uint32_t r_del_ack_ts; /* At send what timestamp of peer was (if r_ts_valid set) */
+ /****************Cache line*****************/
+ uint32_t r_tim_lastsent[BBR_NUM_OF_RETRANS];
+ /*
+ * Question, should we instead just grab the sending b/w
+ * from the filter with the gain and store it in a
+ * uint64_t instead?
+ */
+ uint32_t r_first_sent_time; /* Time of first pkt in flight sent */
+ uint32_t r_pacing_delay; /* pacing delay of this send */
+ uint32_t r_flight_at_send; /* flight at the time of the send */
+#ifdef _KERNEL
+} __aligned(CACHE_LINE_SIZE);
+#else
+};
+#endif
+#define BBR_LIMIT_TYPE_SPLIT 1
+
+TAILQ_HEAD(bbr_head, bbr_sendmap);
+
+#define BBR_SEGMENT_TIME_SIZE 1500 /* How many bytes in time_between */
+
+#define BBR_MIN_SEG 1460 /* MSS size */
+#define BBR_MAX_GAIN_VALUE 0xffff
+
+#define BBR_TIMER_FUDGE 1500 /* 1.5ms in micro seconds */
+
+/* BW twiddle secret codes */
+#define BBR_RED_BW_CONGSIG 0 /* We enter recovery and set using b/w */
+#define BBR_RED_BW_RATECAL 1 /* We are calculating the loss rate */
+#define BBR_RED_BW_USELRBW 2 /* We are dropping the lower b/w with
+ * cDR */
+#define BBR_RED_BW_SETHIGHLOSS 3 /* We have set our highloss value at
+ * exit from probe-rtt */
+#define BBR_RED_BW_PE_CLREARLY 4 /* We have decided to clear the
+ * reduction early */
+#define BBR_RED_BW_PE_CLAFDEL 5 /* We are clearing it on schedule
+ * delayed */
+#define BBR_RED_BW_REC_ENDCLL 6 /* Recover exits save high if needed
+ * an clear to start measuring */
+#define BBR_RED_BW_PE_NOEARLY_OUT 7 /* Set pkt epoch judged that we do not
+ * get out of jail early */
+/* codes for just-return */
+#define BBR_JR_SENT_DATA 0
+#define BBR_JR_CWND_LIMITED 1
+#define BBR_JR_RWND_LIMITED 2
+#define BBR_JR_APP_LIMITED 3
+#define BBR_JR_ASSESSING 4
+/* For calculating a rate */
+#define BBR_CALC_BW 1
+#define BBR_CALC_LOSS 2
+
+#define BBR_RTT_BY_TIMESTAMP 0
+#define BBR_RTT_BY_EXACTMATCH 1
+#define BBR_RTT_BY_EARLIER_RET 2
+#define BBR_RTT_BY_THIS_RETRAN 3
+#define BBR_RTT_BY_SOME_RETRAN 4
+#define BBR_RTT_BY_TSMATCHING 5
+
+/* Markers to track where we enter persists from */
+#define BBR_PERSISTS_FROM_1 1
+#define BBR_PERSISTS_FROM_2 2
+#define BBR_PERSISTS_FROM_3 3
+#define BBR_PERSISTS_FROM_4 4
+#define BBR_PERSISTS_FROM_5 5
+
+/* magic cookies to ask for the RTT */
+#define BBR_RTT_PROP 0
+#define BBR_RTT_RACK 1
+#define BBR_RTT_PKTRTT 2
+#define BBR_SRTT 3
+
+#define BBR_SACKED 0
+#define BBR_CUM_ACKED 1
+
+/* threshold in useconds where we consider we need a higher min cwnd */
+#define BBR_HIGH_SPEED 1000
+#define BBR_HIGHSPEED_NUM_MSS 12
+
+#define MAX_REDUCE_RXT 3 /* What is the maximum times we are willing to
+ * reduce b/w in RTX's. Setting this has a
+ * multiplicative effect e.g. if we are
+ * reducing by 20% then setting it to 3 means
+ * you will have reduced the b/w estimate by >
+ * 60% before you stop. */
+/*
+ * We use the rate sample structure to
+ * assist in single sack/ack rate and rtt
+ * calculation. In the future we will expand
+ * this in BBR to do forward rate sample
+ * b/w estimation.
+ */
+#define BBR_RS_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */
+#define BBR_RS_BW_EMPTY 0x00000002 /* Nothing yet stored in cDR */
+#define BBR_RS_RTT_VALID 0x00000004 /* We have at least one valid RTT */
+#define BBR_RS_BW_VAILD 0x00000008 /* We have a valid cDR */
+#define BBR_RS_EMPTY (BBR_RS_RTT_EMPTY|BBR_RS_BW_EMPTY)
+struct bbr_rtt_sample {
+ uint32_t rs_flags;
+ uint32_t rs_rtt_lowest;
+ uint32_t rs_rtt_lowest_sendtime;
+ uint32_t rs_rtt_low_seq_start;
+
+ uint32_t rs_rtt_highest;
+ uint32_t rs_rtt_cnt;
+
+ uint64_t rs_rtt_tot;
+ uint32_t cur_rtt;
+ uint32_t cur_rtt_bytecnt;
+
+ uint32_t cur_rtt_rsmcnt;
+ uint32_t rc_crtt_set:1,
+ avail_bits:31;
+ uint64_t rs_cDR;
+};
+
+/* RTT shrink reasons */
+#define BBR_RTTS_INIT 0
+#define BBR_RTTS_NEWRTT 1
+#define BBR_RTTS_RTTPROBE 2
+#define BBR_RTTS_WASIDLE 3
+#define BBR_RTTS_PERSIST 4
+#define BBR_RTTS_REACHTAR 5
+#define BBR_RTTS_ENTERPROBE 6
+#define BBR_RTTS_SHRINK_PG 7
+#define BBR_RTTS_SHRINK_PG_FINAL 8
+#define BBR_RTTS_NEW_TARGET 9
+#define BBR_RTTS_LEAVE_DRAIN 10
+#define BBR_RTTS_RESETS_VALUES 11
+
+#define BBR_NUM_RATES 5
+/* Rate flags */
+#define BBR_RT_FLAG_FREE 0x00 /* Is on the free list */
+#define BBR_RT_FLAG_INUSE 0x01 /* Has been allocated */
+#define BBR_RT_FLAG_READY 0x02 /* Ready to initiate a measurement. */
+#define BBR_RT_FLAG_CAPPED_PRE 0x04 /* Ready to cap if we send the next segment */
+#define BBR_RT_FLAG_CAPPED 0x08 /* Measurement is capped */
+#define BBR_RT_FLAG_PASTFA 0x10 /* Past the first ack. */
+#define BBR_RT_FLAG_LIMITED 0x20 /* Saw application/cwnd or rwnd limited period */
+#define BBR_RT_SEEN_A_ACK 0x40 /* A ack has been saved */
+#define BBR_RT_PREV_RTT_SET 0x80 /* There was a RTT set in */
+#define BBR_RT_PREV_SEND_TIME 0x100 /*
+ *There was a RTT send time set that can be used
+ * no snd_limits
+ */
+#define BBR_RT_SET_GRADIENT 0x200
+#define BBR_RT_TS_VALID 0x400
+
+
+struct bbr_log {
+ union {
+ struct bbr_sendmap *rsm; /* For alloc/free */
+ uint64_t sb_acc; /* For out/ack or t-o */
+ };
+ struct tcpcb *tp;
+ uint32_t t_flags;
+ uint32_t th_seq;
+ uint32_t th_ack;
+ uint32_t snd_una;
+ uint32_t snd_nxt;
+ uint32_t snd_max;
+ uint32_t snd_cwnd;
+ uint32_t snd_wnd;
+ uint32_t rc_lost;
+ uint32_t target_cwnd; /* UU */
+ uint32_t inflight; /* UU */
+ uint32_t applimited; /* UU */
+ /* Things for BBR */
+ uint32_t delivered; /* UU */
+ uint64_t cur_del_rate; /* UU */
+ uint64_t delRate; /* UU */
+ uint64_t rttProp; /* UU */
+ uint64_t lt_bw; /* UU */
+ uint32_t timeStamp;
+ uint32_t time;
+ uint32_t slot; /* UU */
+ uint32_t delayed_by;
+ uint32_t exp_del;
+ uint32_t pkts_out;
+ uint32_t new_win;
+ uint32_t hptsi_gain; /* UU */
+ uint32_t cwnd_gain; /* UU */
+ uint32_t epoch; /* UU */
+ uint32_t lt_epoch; /* UU */
+ /* Sack fun */
+ uint32_t blk_start[4]; /* xx */
+ uint32_t blk_end[4];
+ uint32_t len; /* Timeout T3=1, TLP=2, RACK=3 */
+ uint8_t type;
+ uint8_t n_sackblks;
+ uint8_t applied; /* UU */
+ uint8_t inhpts; /* UU */
+ uint8_t ininput; /* UU */
+ uint8_t use_lt_bw; /* UU */
+};
+
+struct bbr_log_sysctl_out {
+ uint32_t bbr_log_at;
+ uint32_t bbr_log_max;
+ struct bbr_log entries[0];
+};
+
+/*
+ * Magic numbers for logging timeout events if the
+ * logging is enabled.
+ */
+#define BBR_TO_FRM_TMR 1
+#define BBR_TO_FRM_TLP 2
+#define BBR_TO_FRM_RACK 3
+#define BBR_TO_FRM_KEEP 4
+#define BBR_TO_FRM_PERSIST 5
+#define BBR_TO_FRM_DELACK 6
+
+#define BBR_SEES_STRETCH_ACK 1
+#define BBR_SEES_COMPRESSED_ACKS 2
+
+
+/*
+ * As we get each SACK we wade through the
+ * rc_map and mark off what is acked.
+ * We also increment rc_sacked as well.
+ *
+ * We also pay attention to missing entries
+ * based on the time and possibly mark them
+ * for retransmit. If we do and we are not already
+ * in recovery we enter recovery. In doing
+ * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec.
+ * We also setup rc_next/rc_snd_nxt/rc_send_end so
+ * we will know where to send from. When not in
+ * recovery rc_next will be NULL and rc_snd_nxt should
+ * equal snd_max.
+ *
+ * Whenever we retransmit from recovery we increment
+ * rc_holes_rxt as we retran a block and mark it as retransmitted
+ * with the time it was sent. During non-recovery sending we
+ * add to our map and note the time down of any send expanding
+ * the rc_map at the tail and moving rc_snd_nxt up with snd_max.
+ *
+ * In recovery during SACK/ACK processing if a chunk has
+ * been retransmitted and it is now acked, we decrement rc_holes_rxt.
+ * When we retransmit from the scoreboard we use
+ * rc_next and rc_snd_nxt/rc_send_end to help us
+ * find what needs to be retran.
+ *
+ * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt
+ * This gets us the effect of RFC6675 pipe, counting twice for
+ * bytes retransmitted.
+ */
+
+#define TT_BBR_FR_TMR 0x2001
+
+#define BBR_SCALE 8
+#define BBR_UNIT (1 << BBR_SCALE)
+
+#define BBR_NUM_RTTS_FOR_DEL_LIMIT 8 /* How many pkt-rtts do we keep
+ * Delivery rate for */
+#define BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT 10 /* How many pkt-rtts do we keep
+ * Delivery rate for google */
+
+#define BBR_SECONDS_NO_RTT 10 /* 10 seconds with no RTT shrinkage */
+#define BBR_PROBERTT_MAX 200 /* 200ms */
+#define BBR_PROBERTT_NUM_MSS 4
+#define BBR_STARTUP_EPOCHS 3
+#define USECS_IN_MSEC 1000
+#define BBR_TIME_TO_SECONDS(a) (a / USECS_IN_SECOND)
+#define BBR_TIME_TO_MILLI(a) (a / MS_IN_USEC)
+
+
+/* BBR keeps time in usec's so we divide by 1000 and round up */
+#define BBR_TS_TO_MS(t) ((t+999)/MS_IN_USEC)
+
+/*
+ * Locking for the rack control block.
+ * a) Locked by INP_WLOCK
+ * b) Locked by the hpts-mutex
+ *
+ */
+#define BBR_STATE_STARTUP 0x01
+#define BBR_STATE_DRAIN 0x02
+#define BBR_STATE_PROBE_BW 0x03
+#define BBR_STATE_PROBE_RTT 0x04
+#define BBR_STATE_IDLE_EXIT 0x05
+
+/* Substate defines for STATE == PROBE_BW */
+#define BBR_SUB_GAIN 0 /* State 0 where we are 5/4 BBR_UNIT */
+#define BBR_SUB_DRAIN 1 /* State 1 where we are at 3/4 BBR_UNIT */
+#define BBR_SUB_LEVEL1 2 /* State 1 first BBR_UNIT */
+#define BBR_SUB_LEVEL2 3 /* State 2nd BBR_UNIT */
+#define BBR_SUB_LEVEL3 4 /* State 3rd BBR_UNIT */
+#define BBR_SUB_LEVEL4 5 /* State 4th BBR_UNIT */
+#define BBR_SUB_LEVEL5 6 /* State 5th BBR_UNIT */
+#define BBR_SUB_LEVEL6 7 /* State last BBR_UNIT */
+#define BBR_SUBSTATE_COUNT 8
+
+/* Single remaining reduce log */
+#define BBR_REDUCE_AT_FR 5
+
+#define BBR_BIG_LOG_SIZE 300000
+
+/* Bits per second in bytes per second */
+#define FORTY_EIGHT_MBPS 6000000 /* 48 megabits in bytes */
+#define THIRTY_MBPS 3750000 /* 30 megabits in bytes */
+#define TWENTY_THREE_MBPS 2896000
+#define FIVETWELVE_MBPS 64000000 /* 512 megabits in bytes */
+#define ONE_POINT_TWO_MEG 150000 /* 1.2 megabits in bytes */
+
+struct bbr_stats {
+ uint64_t bbr_badfr; /* 0 */
+ uint64_t bbr_badfr_bytes; /* 1 */
+ uint64_t bbr_saw_oerr; /* 2 */
+ uint64_t bbr_saw_emsgsiz; /* 3 */
+ uint64_t bbr_reorder_seen; /* 4 */
+ uint64_t bbr_tlp_tot; /* 5 */
+ uint64_t bbr_tlp_newdata; /* 6 */
+ uint64_t bbr_offset_recovery; /* 7 */
+ uint64_t bbr_tlp_retran_fail; /* 8 */
+ uint64_t bbr_to_tot; /* 9 */
+ uint64_t bbr_to_arm_rack; /* 10 */
+ uint64_t bbr_enter_probertt; /* 11 */
+ uint64_t bbr_tlp_set; /* 12 */
+ uint64_t bbr_resends_set; /* 13 */
+ uint64_t bbr_force_output; /* 14 */
+ uint64_t bbr_to_arm_tlp; /* 15 */
+ uint64_t bbr_paced_segments; /* 16 */
+ uint64_t bbr_saw_enobuf; /* 17 */
+ uint64_t bbr_to_alloc_failed; /* 18 */
+ uint64_t bbr_to_alloc_emerg; /* 19 */
+ uint64_t bbr_sack_proc_all; /* 20 */
+ uint64_t bbr_sack_proc_short; /* 21 */
+ uint64_t bbr_sack_proc_restart; /* 22 */
+ uint64_t bbr_to_alloc; /* 23 */
+ uint64_t bbr_offset_drop; /* 24 */
+ uint64_t bbr_runt_sacks; /* 25 */
+ uint64_t bbr_sack_passed; /* 26 */
+ uint64_t bbr_rlock_left_ret0; /* 27 */
+ uint64_t bbr_rlock_left_ret1; /* 28 */
+ uint64_t bbr_dynamic_rwnd; /* 29 */
+ uint64_t bbr_static_rwnd; /* 30 */
+ uint64_t bbr_sack_blocks; /* 31 */
+ uint64_t bbr_sack_blocks_skip; /* 32 */
+ uint64_t bbr_sack_search_both; /* 33 */
+ uint64_t bbr_sack_search_fwd; /* 34 */
+ uint64_t bbr_sack_search_back; /* 35 */
+ uint64_t bbr_plain_acks; /* 36 */
+ uint64_t bbr_acks_with_sacks; /* 37 */
+ uint64_t bbr_progress_drops; /* 38 */
+ uint64_t bbr_early; /* 39 */
+ uint64_t bbr_reneges_seen; /* 40 */
+ uint64_t bbr_persist_reneg; /* 41 */
+ uint64_t bbr_dropped_af_data; /* 42 */
+ uint64_t bbr_failed_mbuf_aloc; /* 43 */
+ uint64_t bbr_cwnd_limited; /* 44 */
+ uint64_t bbr_rwnd_limited; /* 45 */
+ uint64_t bbr_app_limited; /* 46 */
+ uint64_t bbr_force_timer_start; /* 47 */
+ uint64_t bbr_hpts_min_time; /* 48 */
+ uint64_t bbr_meets_tso_thresh; /* 49 */
+ uint64_t bbr_miss_tso_rwnd; /* 50 */
+ uint64_t bbr_miss_tso_cwnd; /* 51 */
+ uint64_t bbr_miss_tso_app; /* 52 */
+ uint64_t bbr_miss_retran; /* 53 */
+ uint64_t bbr_miss_tlp; /* 54 */
+ uint64_t bbr_miss_unknown; /* 55 */
+ uint64_t bbr_hdwr_rl_add_ok; /* 56 */
+ uint64_t bbr_hdwr_rl_add_fail; /* 57 */
+ uint64_t bbr_hdwr_rl_mod_ok; /* 58 */
+ uint64_t bbr_hdwr_rl_mod_fail; /* 59 */
+ uint64_t bbr_collapsed_win; /* 60 */
+ uint64_t bbr_alloc_limited; /* 61 */
+ uint64_t bbr_alloc_limited_conns; /* 62 */
+ uint64_t bbr_split_limited; /* 63 */
+};
+
+/*
+ * The structure bbr_opt_stats is a simple
+ * way to see how many options are being
+ * changed in the stack.
+ */
+struct bbr_opts_stats {
+ uint64_t tcp_bbr_pace_per_sec;
+ uint64_t tcp_bbr_pace_del_tar;
+ uint64_t tcp_bbr_pace_seg_max;
+ uint64_t tcp_bbr_pace_seg_min;
+ uint64_t tcp_bbr_pace_cross;
+ uint64_t tcp_bbr_drain_inc_extra;
+ uint64_t tcp_bbr_unlimited;
+ uint64_t tcp_bbr_iwintso;
+ uint64_t tcp_bbr_rec_over_hpts;
+ uint64_t tcp_bbr_recforce;
+ uint64_t tcp_bbr_startup_pg;
+ uint64_t tcp_bbr_drain_pg;
+ uint64_t tcp_bbr_rwnd_is_app;
+ uint64_t tcp_bbr_probe_rtt_int;
+ uint64_t tcp_bbr_one_retran;
+ uint64_t tcp_bbr_startup_loss_exit;
+ uint64_t tcp_bbr_use_lowgain;
+ uint64_t tcp_bbr_lowgain_thresh;
+ uint64_t tcp_bbr_lowgain_half;
+ uint64_t tcp_bbr_lowgain_fd;
+ uint64_t tcp_bbr_usedel_rate;
+ uint64_t tcp_bbr_min_rto;
+ uint64_t tcp_bbr_max_rto;
+ uint64_t tcp_rack_pace_max_seg;
+ uint64_t tcp_rack_min_to;
+ uint64_t tcp_rack_reord_thresh;
+ uint64_t tcp_rack_reord_fade;
+ uint64_t tcp_rack_tlp_thresh;
+ uint64_t tcp_rack_pkt_delay;
+ uint64_t tcp_bbr_startup_exit_epoch;
+ uint64_t tcp_bbr_ack_comp_alg;
+ uint64_t tcp_rack_cheat;
+ uint64_t tcp_iwnd_tso;
+ uint64_t tcp_utter_max_tso;
+ uint64_t tcp_hdwr_pacing;
+ uint64_t tcp_extra_state;
+ uint64_t tcp_floor_min_tso;
+ /* New */
+ uint64_t tcp_bbr_algorithm;
+ uint64_t tcp_bbr_tslimits;
+ uint64_t tcp_bbr_probertt_len;
+ uint64_t tcp_bbr_probertt_gain;
+ uint64_t tcp_bbr_topaceout;
+ uint64_t tcp_use_rackcheat;
+ uint64_t tcp_delack;
+ uint64_t tcp_maxpeak;
+ uint64_t tcp_retran_wtso;
+ uint64_t tcp_data_ac;
+ uint64_t tcp_ts_raises;
+ uint64_t tcp_pacing_oh_tmr;
+ uint64_t tcp_pacing_oh;
+ uint64_t tcp_policer_det;
+};
+
+
+#ifdef _KERNEL
+#define BBR_STAT_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t))
+extern counter_u64_t bbr_stat_arry[BBR_STAT_SIZE];
+#define BBR_STAT_ADD(name, amm) counter_u64_add(bbr_stat_arry[(offsetof(struct bbr_stats, name)/sizeof(uint64_t))], (amm))
+#define BBR_STAT_INC(name) BBR_STAT_ADD(name, 1)
+#define BBR_OPTS_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t))
+extern counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE];
+#define BBR_OPTS_ADD(name, amm) counter_u64_add(bbr_opts_arry[(offsetof(struct bbr_opts_stats, name)/sizeof(uint64_t))], (amm))
+#define BBR_OPTS_INC(name) BBR_OPTS_ADD(name, 1)
+#endif
+
+#define BBR_NUM_LOSS_RATES 3
+#define BBR_NUM_BW_RATES 3
+
+#define BBR_RECOVERY_LOWRTT 1
+#define BBR_RECOVERY_MEDRTT 2
+#define BBR_RECOVERY_HIGHRTT 3
+#define BBR_RECOVERY_EXTREMERTT 4
+
+
+struct bbr_control {
+ /*******************************/
+ /* Cache line 2 from bbr start */
+ /*******************************/
+ struct bbr_head rc_map; /* List of all segments Lock(a) */
+ struct bbr_head rc_tmap; /* List in transmit order Lock(a) */
+ struct bbr_sendmap *rc_resend; /* something we have been asked to
+ * resend */
+ uint32_t rc_last_delay_val; /* How much we expect to delay Lock(a) */
+ uint32_t rc_bbr_hptsi_gain:16, /* Current hptsi gain Lock(a) */
+ rc_hpts_flags:16; /* flags on whats on the pacer wheel */
+
+ uint32_t rc_delivered; /* BRR delivered amount Lock(a) */
+ uint32_t rc_hptsi_agg_delay; /* How much time are we behind */
+
+ uint32_t rc_flight_at_input;
+ uint32_t rc_lost_bytes; /* Total bytes currently marked lost */
+ /*******************************/
+ /* Cache line 3 from bbr start */
+ /*******************************/
+ struct time_filter rc_delrate;
+ /*******************************/
+ /* Cache line 4 from bbr start */
+ /*******************************/
+ struct bbr_head rc_free; /* List of Free map entries Lock(a) */
+ struct bbr_sendmap *rc_tlp_send; /* something we have been
+ * asked to resend */
+ uint32_t rc_del_time;
+ uint32_t rc_target_at_state; /* Target for a state */
+
+ uint16_t rc_free_cnt; /* Number of free entries on the rc_free list
+ * Lock(a) */
+ uint16_t rc_startup_pg;
+
+ uint32_t cur_rtt; /* Last RTT from ack */
+
+
+ uint32_t rc_went_idle_time; /* Used for persits to see if its
+ * probe-rtt qualified */
+ uint32_t rc_pace_max_segs:17, /* How much in any single TSO we send Lock(a) */
+ rc_pace_min_segs:15; /* The minimum single segment size before we enter persists */
+
+ uint32_t rc_rtt_shrinks; /* Time of last rtt shrinkage Lock(a) */
+ uint32_t r_app_limited_until;
+ uint32_t rc_timer_exp; /* If a timer ticks of expiry */
+ uint32_t rc_rcv_epoch_start; /* Start time of the Epoch Lock(a) */
+
+ /*******************************/
+ /* Cache line 5 from bbr start */
+ /*******************************/
+
+ uint32_t rc_lost_at_pktepoch; /* what the lost value was at the last
+ * pkt-epoch */
+ uint32_t r_measurement_count; /* count of measurement applied lock(a) */
+
+
+ uint32_t rc_last_tlp_seq; /* Last tlp sequence Lock(a) */
+ uint16_t rc_reorder_shift; /* Socket option value Lock(a) */
+ uint16_t rc_pkt_delay; /* Socket option value Lock(a) */
+
+ struct bbr_sendmap *rc_sacklast; /* sack remembered place
+ * Lock(a) */
+ struct bbr_sendmap *rc_next; /* remembered place where we next
+ * retransmit at Lock(a) */
+
+ uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */
+ uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */
+
+ uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */
+ uint32_t rc_init_rwnd; /* Initial rwnd when we transitioned */
+ /*- ---
+ * used only inital and close
+ */
+ uint32_t rc_high_rwnd; /* Highest rwnd seen */
+ uint32_t rc_lowest_rtt; /* Smallest RTT we have seen */
+
+ uint32_t rc_last_rtt; /* Last valid measured RTT that ack'd data */
+ uint32_t bbr_cross_over;
+
+ /*******************************/
+ /* Cache line 6 from bbr start */
+ /*******************************/
+ struct sack_filter bbr_sf;
+
+ /*******************************/
+ /* Cache line 7 from bbr start */
+ /*******************************/
+ struct time_filter_small rc_rttprop;
+ uint32_t last_inbound_ts; /* Peers last timestamp */
+
+ uint32_t rc_inc_tcp_oh: 1,
+ rc_inc_ip_oh: 1,
+ rc_inc_enet_oh:1,
+ rc_incr_tmrs:1,
+ restrict_growth:28;
+ uint32_t rc_lt_epoch_use; /* When we started lt-bw use Lock(a) */
+
+ uint32_t rc_recovery_start; /* Time we start recovery Lock(a) */
+ uint32_t rc_lt_del; /* Delivered at lt bw sampling start Lock(a) */
+
+ uint64_t rc_bbr_cur_del_rate; /* Current measured delivery rate
+ * Lock(a) */
+
+ /*******************************/
+ /* Cache line 8 from bbr start */
+ /*******************************/
+ uint32_t rc_cwnd_on_ent; /* On entry to recovery the cwnd
+ * Lock(a) */
+ uint32_t rc_agg_early; /* aggregate amount early */
+
+ uint32_t rc_rcvtime; /* When we last received data Lock(a) */
+ uint32_t rc_pkt_epoch_del; /* seq num that we need for RTT epoch */
+
+ uint32_t rc_pkt_epoch; /* Epoch based on packet RTTs */
+ uint32_t rc_pkt_epoch_time; /* Time we started the pkt epoch */
+
+ uint32_t rc_pkt_epoch_rtt; /* RTT using the packet epoch */
+ uint32_t rc_rtt_epoch; /* Current RTT epoch, it ticks every rttProp
+ * Lock(a) */
+ uint32_t lowest_rtt;
+ uint32_t bbr_smallest_srtt_this_state;
+
+ uint32_t rc_lt_epoch; /* LT epoch start of bw_sampling */
+ uint32_t rc_lost_at_startup;
+
+ uint32_t rc_bbr_state_atflight;
+ uint32_t rc_bbr_last_startup_epoch; /* Last startup epoch where we
+ * increased 20% */
+ uint32_t rc_bbr_enters_probertt; /* Timestamp we entered
+ * probertt Lock(a) */
+ uint32_t rc_lt_time; /* Time of lt sampling start Lock(a) */
+
+ /*******************************/
+ /* Cache line 9 from bbr start */
+ /*******************************/
+ uint64_t rc_lt_bw; /* LT bw calculated Lock(a) */
+ uint64_t rc_bbr_lastbtlbw; /* For startup, what was last btlbw I
+ * saw to check the 20% gain Lock(a) */
+
+
+ uint32_t rc_bbr_cwnd_gain; /* Current cwnd gain Lock(a) */
+ uint32_t rc_pkt_epoch_loss_rate; /* pkt-epoch loss rate */
+
+ uint32_t rc_saved_cwnd; /* Saved cwnd during Probe-rtt drain Lock(a) */
+ uint32_t substate_pe;
+
+ uint32_t rc_lost; /* Number of bytes lost Lock(a) */
+ uint32_t rc_exta_time_gd; /* How much extra time we got in d/g */
+
+ uint32_t rc_lt_lost; /* Number of lt bytes lost at sampling start
+ * Lock(a) */
+ uint32_t rc_bbr_state_time;
+
+ uint32_t rc_min_to; /* Socket option value Lock(a) */
+ uint32_t rc_initial_hptsi_bw; /* Our initial startup bw Lock(a) */
+
+ uint32_t bbr_lost_at_state; /* Temp counter debug lost value as we
+ * enter a state */
+ /*******************************/
+ /* Cache line 10 from bbr start */
+ /*******************************/
+ uint32_t rc_level_state_extra;
+ uint32_t rc_red_cwnd_pe;
+ const struct tcp_hwrate_limit_table *crte;
+ uint64_t red_bw;
+
+ uint32_t rc_probertt_int;
+ uint32_t rc_probertt_srttchktim; /* Time we last did a srtt
+ * check */
+ uint32_t gain_epoch; /* Epoch we should be out of gain */
+ uint32_t rc_min_rto_ms;
+
+ uint32_t rc_reorder_fade; /* Socket option value Lock(a) */
+ uint32_t last_startup_measure;
+
+ int32_t bbr_hptsi_per_second;
+ int32_t bbr_hptsi_segments_delay_tar;
+
+ int32_t bbr_hptsi_segments_max;
+ uint32_t bbr_rttprobe_gain_val;
+ /*******************************/
+ /* Cache line 11 from bbr start */
+ /*******************************/
+ uint32_t cur_rtt_send_time; /* Time we sent our rtt measured packet */
+ uint32_t bbr_peer_tsratio; /* Our calculated ts ratio to multply */
+ uint32_t bbr_ts_check_tstmp; /* When we filled it the TS that came on the ack */
+ uint32_t bbr_ts_check_our_cts; /* When we filled it the cts of the send */
+ uint32_t rc_tlp_rxt_last_time;
+ uint32_t bbr_smallest_srtt_state2;
+ uint32_t bbr_hdwr_cnt_noset_snt; /* count of hw pacing sends during delay */
+ uint32_t startup_last_srtt;
+ uint32_t rc_ack_hdwr_delay;
+ uint32_t highest_hdwr_delay; /* Largest delay we have seen from hardware */
+ uint32_t non_gain_extra;
+ uint32_t recovery_lr; /* The sum of the loss rate from the pe's during recovery */
+ uint32_t last_in_probertt;
+ uint32_t flightsize_at_drain; /* In draining what was the last marked flight size */
+ uint32_t rc_pe_of_prtt; /* PE we went into probe-rtt */
+ uint32_t ts_in; /* ts that went with the last rtt */
+
+ uint16_t rc_tlp_seg_send_cnt; /* Number of times we have TLP sent
+ * rc_last_tlp_seq Lock(a) */
+ uint16_t rc_drain_pg;
+ uint32_t rc_num_maps_alloced; /* num send map entries allocated */
+ uint32_t rc_num_split_allocs; /* num split map entries allocated */
+ uint16_t rc_num_small_maps_alloced; /* Number of sack blocks
+ * allocated */
+ uint16_t bbr_hptsi_bytes_min;
+
+ uint16_t bbr_hptsi_segments_floor;
+ uint16_t bbr_utter_max;
+ uint16_t bbr_google_discount;
+
+};
+
+
+struct socket;
+struct tcp_bbr {
+ /* First cache line 0x00 */
+ int32_t(*r_substate) (struct mbuf *, struct tcphdr *,
+ struct socket *, struct tcpcb *, struct tcpopt *,
+ int32_t, int32_t, uint32_t, int32_t, int32_t); /* Lock(a) */
+ struct tcpcb *rc_tp; /* The tcpcb Lock(a) */
+ struct inpcb *rc_inp; /* The inpcb Lock(a) */
+ struct timeval rc_tv;
+ uint32_t rc_pacer_started; /* Time we started the pacer */
+ uint16_t no_pacing_until:8, /* No pacing until N packet epochs */
+ ts_can_raise:1,/* TS b/w calculations can raise the bw higher */
+ skip_gain:1, /* Skip the gain cycle (hardware pacing) */
+ gain_is_limited:1, /* With hardware pacing we are limiting gain */
+ output_error_seen:1,
+ oerror_cnt:4,
+ hw_pacing_set:1; /* long enough has passed for us to start pacing */
+ uint16_t xxx_r_ack_count; /* During recovery count of ack's received
+ * that added data since output */
+ uint16_t bbr_segs_rcvd; /* In Segment count since we sent a ack */
+
+ uint8_t bbr_timer_src:4, /* Used for debugging Lock(a) */
+ bbr_use_rack_cheat:1, /* Use the rack cheat */
+ bbr_init_win_cheat:1, /* Send full IW for TSO */
+ bbr_attempt_hdwr_pace:1,/* Try to do hardware pacing */
+ bbr_hdrw_pacing:1; /* Hardware pacing is available */
+ uint8_t bbr_hdw_pace_ena:1, /* Does the connection allow hardware pacing to be attempted */
+ bbr_prev_in_rec:1, /* We were previously in recovery */
+ pkt_conservation:1,
+ use_policer_detection:1,
+ xxx_bbr_hdw_pace_idx:4; /* If hardware pacing is on, index to slot in pace tbl */
+ uint16_t r_wanted_output:1,
+ rtt_valid:1,
+ rc_timer_first:1,
+ rc_output_starts_timer:1,
+ rc_resends_use_tso:1,
+ rc_all_timers_stopped:1,
+ rc_loss_exit:1,
+ rc_ack_was_delayed:1,
+ rc_lt_is_sampling:1,
+ rc_filled_pipe:1,
+ rc_tlp_new_data:1,
+ rc_hit_state_1:1,
+ rc_ts_valid:1,
+ rc_prtt_set_ts:1,
+ rc_is_pkt_epoch_now:1,
+ rc_has_collapsed:1;
+
+ uint8_t r_state:4, /* Current bbr state Lock(a) */
+ r_agg_early_set:1, /* Did we get called early */
+ r_init_rtt:1,
+ r_use_policer:1, /* For google mode only */
+ r_recovery_bw:1;
+ uint8_t r_timer_override:1, /* pacer override Lock(a) 0/1 */
+ rc_in_persist:1,
+ rc_lt_use_bw:1,
+ rc_allow_data_af_clo:1,
+ rc_tlp_rtx_out:1, /* A TLP is in flight */
+ rc_tlp_in_progress:1, /* a TLP timer is running needed? */
+ rc_use_idle_restart:1; /* Do we restart fast after idle (persist or applim) */
+ uint8_t rc_bbr_state:3, /* What is the major BBR state */
+ rc_bbr_substate:3, /* For probeBW state */
+ r_is_v6:1,
+ rc_past_init_win:1;
+ uint8_t rc_last_options;
+ uint8_t rc_tlp_threshold; /* Socket option value Lock(a) */
+ uint8_t rc_max_rto_sec;
+ uint8_t rc_cwnd_limited:1, /* We are cwnd limited */
+ rc_tmr_stopped:7; /* What timers have been stopped */
+ uint8_t rc_use_google:1,
+ rc_use_ts_limit:1,
+ rc_ts_data_set:1, /* We have filled a set point to determine */
+ rc_ts_clock_set:1, /* We have determined the ts type */
+ rc_ts_cant_be_used:1, /* We determined we can't use ts values */
+ rc_ack_is_cumack:1,
+ rc_no_pacing:1,
+ alloc_limit_reported:1;
+ uint8_t rc_init_win;
+ /* Cache line 2 0x40 */
+ struct bbr_control r_ctl;
+#ifdef _KERNEL
+} __aligned(CACHE_LINE_SIZE);
+#else
+};
+#endif
+
+#endif
Index: head/sys/netinet/tcp_stacks/tcp_rack.h
===================================================================
--- head/sys/netinet/tcp_stacks/tcp_rack.h
+++ head/sys/netinet/tcp_stacks/tcp_rack.h
@@ -1,5 +1,5 @@
/*-
- * Copyright (c) 2016 Netflix, Inc.
+ * Copyright (c) 2016-9 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -28,39 +28,39 @@
#ifndef _NETINET_TCP_RACK_H_
#define _NETINET_TCP_RACK_H_
-#define RACK_ACKED 0x0001/* The remote endpoint acked this */
-#define RACK_TO_MIXED 0x0002/* A timeout occured that mixed the send order */
-#define RACK_DEFERRED 0x0004/* We can't use this for RTT calc */
-#define RACK_OVERMAX 0x0008/* We have more retran's then we can fit */
-#define RACK_SACK_PASSED 0x0010/* A sack was done above this block */
-#define RACK_WAS_SACKPASS 0x0020/* We retransmitted due to SACK pass */
-#define RACK_HAS_FIN 0x0040/* segment is sent with fin */
-#define RACK_TLP 0x0080/* segment sent as tail-loss-probe */
-
+#define RACK_ACKED 0x0001/* The remote endpoint acked this */
+#define RACK_TO_MIXED 0x0002/* A timeout occured that mixed the send order - not used */
+#define RACK_DEFERRED 0x0004/* We can't use this for RTT calc - not used */
+#define RACK_OVERMAX 0x0008/* We have more retran's then we can fit */
+#define RACK_SACK_PASSED 0x0010/* A sack was done above this block */
+#define RACK_WAS_SACKPASS 0x0020/* We retransmitted due to SACK pass */
+#define RACK_HAS_FIN 0x0040/* segment is sent with fin */
+#define RACK_TLP 0x0080/* segment sent as tail-loss-probe */
+#define RACK_RWND_COLLAPSED 0x0100/* The peer collapsed the rwnd on the segment */
#define RACK_NUM_OF_RETRANS 3
#define RACK_INITIAL_RTO 1000 /* 1 second in milli seconds */
struct rack_sendmap {
- TAILQ_ENTRY(rack_sendmap) r_next; /* seq number arrayed next */
- TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */
- uint32_t r_tim_lastsent[RACK_NUM_OF_RETRANS];
uint32_t r_start; /* Sequence number of the segment */
uint32_t r_end; /* End seq, this is 1 beyond actually */
+ TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */
+ RB_ENTRY(rack_sendmap) r_next; /* RB Tree next */
uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */
uint16_t r_rtr_cnt; /* Retran count, index this -1 to get time
* sent */
- uint8_t r_flags; /* Flags as defined above */
- uint8_t r_sndcnt; /* Retran count, not limited by
- * RACK_NUM_OF_RETRANS */
+ uint16_t r_flags; /* Flags as defined above */
+ uint32_t r_tim_lastsent[RACK_NUM_OF_RETRANS];
+ uint8_t r_dupack; /* Dup ack count */
uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */
uint8_t r_limit_type; /* is this entry counted against a limit? */
- uint8_t r_resv[2];
+ uint8_t r_resv[49];
};
-#define RACK_LIMIT_TYPE_SPLIT 1
+RB_HEAD(rack_rb_tree_head, rack_sendmap);
TAILQ_HEAD(rack_head, rack_sendmap);
+#define RACK_LIMIT_TYPE_SPLIT 1
/*
* We use the rate sample structure to
@@ -136,6 +136,8 @@
uint64_t rack_no_timer_in_hpts;
uint64_t tcp_rack_min_pace_seg;
uint64_t tcp_rack_min_pace;
+ uint64_t tcp_rack_cheat;
+ uint64_t tcp_rack_no_sack;
};
#define TLP_USE_ID 1 /* Internet draft behavior */
@@ -188,15 +190,19 @@
* b) Locked by the hpts-mutex
*
*/
+#define RACK_GP_HIST 4 /* How much goodput history do we maintain? */
struct rack_control {
/* Second cache line 0x40 from tcp_rack */
- struct rack_head rc_map;/* List of all segments Lock(a) */
+ struct rack_rb_tree_head rc_mtree; /* Tree of all segments Lock(a) */
struct rack_head rc_tmap; /* List in transmit order Lock(a) */
struct rack_sendmap *rc_tlpsend; /* Remembered place for
* tlp_sending Lock(a) */
struct rack_sendmap *rc_resend; /* something we have been asked to
* resend */
+ struct timeval rc_last_time_decay; /* SAD time decay happened here */
+ uint32_t input_pkt;
+ uint32_t saved_input_pkt;
uint32_t rc_hpts_flags;
uint32_t rc_timer_exp; /* If a timer ticks of expiry */
uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */
@@ -244,22 +250,32 @@
* have allocated */
uint32_t rc_rcvtime; /* When we last received data */
uint32_t rc_num_split_allocs; /* num split map entries allocated */
+
uint32_t rc_last_output_to;
uint32_t rc_went_idle_time;
struct rack_sendmap *rc_sacklast; /* sack remembered place
* Lock(a) */
- struct rack_sendmap *rc_next; /* remembered place where we next
- * retransmit at Lock(a) */
struct rack_sendmap *rc_rsm_at_retran; /* Debug variable kept for
* cache line alignment
* Lock(a) */
+ struct timeval rc_last_ack;
/* Cache line split 0x100 */
struct sack_filter rack_sf;
/* Cache line split 0x140 */
/* Flags for various things */
+ uint32_t rc_pace_max_segs;
+ uint32_t rc_pace_min_segs;
+ uint32_t rc_high_rwnd;
+ uint32_t ack_count;
+ uint32_t sack_count;
+ uint32_t sack_noextra_move;
+ uint32_t sack_moved_extra;
struct rack_rtt_sample rack_rs;
+ uint32_t rc_tlp_rxt_last_time;
+ uint32_t rc_saved_cwnd;
+ uint32_t rc_gp_history[RACK_GP_HIST];
uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */
uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */
uint16_t rc_reorder_shift; /* Socket option value Lock(a) */
@@ -270,9 +286,11 @@
uint8_t rc_early_recovery; /* Socket option value Lock(a) */
uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */
uint8_t rc_min_to; /* Socket option value Lock(a) */
- uint8_t rc_prr_inc_var; /* Socket option value Lock(a) */
uint8_t rc_tlp_rtx_out; /* This is TLPRtxOut in the draft */
uint8_t rc_rate_sample_method;
+ uint8_t rc_gp_hist_idx: 7,
+ rc_gp_hist_filled: 1;
+
};
#ifdef _KERNEL
@@ -305,16 +323,22 @@
rc_last_pto_set : 1, /* XXX not used */
rc_tlp_in_progress : 1,
rc_always_pace : 1, /* Socket option value Lock(a) */
- rc_timer_up : 1; /* The rack timer is up flag Lock(a) */
- uint8_t r_idle_reduce_largest : 1,
- r_enforce_min_pace : 2,
- r_min_pace_seg_thresh : 5;
+ tlp_timer_up : 1; /* The tlp timer is up flag Lock(a) */
+ uint8_t r_enforce_min_pace : 2,
+ rc_has_collapsed : 1,
+ r_rep_attack : 1,
+ r_rep_reverse : 1,
+ r_xxx_min_pace_seg_thresh : 3;
uint8_t rack_tlp_threshold_use;
uint8_t rc_allow_data_af_clo: 1,
delayed_ack : 1,
+ set_pacing_done_a_iw : 1,
+ use_rack_cheat : 1,
alloc_limit_reported : 1,
- rc_avail : 5;
- uint8_t r_resv[2]; /* Fill to cache line boundary */
+ sack_attack_disable : 1,
+ do_detection : 1,
+ rc_avail : 1;
+ uint16_t rack_per_of_gp;
/* Cache line 2 0x40 */
struct rack_control r_ctl;
} __aligned(CACHE_LINE_SIZE);
Index: head/sys/sys/mbuf.h
===================================================================
--- head/sys/sys/mbuf.h
+++ head/sys/sys/mbuf.h
@@ -439,18 +439,18 @@
*/
#define M_COPYFLAGS \
(M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG|M_TSTMP| \
- M_TSTMP_HPREC|M_PROTOFLAGS)
+ M_TSTMP_HPREC|M_TSTMP_LRO|M_PROTOFLAGS)
/*
* Mbuf flag description for use with printf(9) %b identifier.
*/
#define M_FLAG_BITS \
"\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \
- "\7M_PROMISC\10M_VLANTAG\11M_NOMAP\12M_NOFREE\13M_TSTMP\14M_TSTMP_HPREC"
+ "\7M_PROMISC\10M_VLANTAG\11M_NOMAP\12M_NOFREE\13M_TSTMP\14M_TSTMP_HPREC\15M_TSTMP_LRO"
#define M_FLAG_PROTOBITS \
- "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \
- "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \
- "\27M_PROTO11"
+ "\16M_PROTO1\17M_PROTO2\20M_PROTO3\21M_PROTO4" \
+ "\22M_PROTO5\23M_PROTO6\24M_PROTO7\25M_PROTO8\26M_PROTO9" \
+ "\27M_PROTO10\28M_PROTO11"
#define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS)
/*
@@ -1496,7 +1496,7 @@
{
KASSERT((m->m_flags & M_PKTHDR) != 0, ("mbuf %p no M_PKTHDR", m));
- KASSERT((m->m_flags & M_TSTMP) != 0, ("mbuf %p no M_TSTMP", m));
+ KASSERT((m->m_flags & (M_TSTMP|M_TSTMP_LRO)) != 0, ("mbuf %p no M_TSTMP or M_TSTMP_LRO", m));
ts->tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000;
ts->tv_nsec = m->m_pkthdr.rcv_tstmp % 1000000000;
}
Index: head/sys/sys/tim_filter.h
===================================================================
--- head/sys/sys/tim_filter.h
+++ head/sys/sys/tim_filter.h
@@ -0,0 +1,134 @@
+#ifndef __tim_filter_h__
+#define __tim_filter_h__
+/*-
+ * Copyright (c) 2016-9 Netflix, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+/*
+ * Author: Randall Stewart <rrs@netflix.com>
+ */
+
+#include <sys/types.h>
+#include <machine/param.h>
+/*
+ * Do not change the size unless you know what you are
+ * doing, the current size of 5 is designed around
+ * the cache-line size for an amd64 processor. Other processors
+ * may need other sizes.
+ */
+#define NUM_FILTER_ENTRIES 3
+
+struct filter_entry {
+ uint64_t value; /* Value */
+ uint32_t time_up; /* Time updated */
+} __packed ;
+
+struct filter_entry_small {
+ uint32_t value; /* Value */
+ uint32_t time_up; /* Time updated */
+};
+
+struct time_filter {
+ uint32_t cur_time_limit;
+ struct filter_entry entries[NUM_FILTER_ENTRIES];
+#ifdef _KERNEL
+} __aligned(CACHE_LINE_SIZE);
+#else
+};
+#endif
+struct time_filter_small {
+ uint32_t cur_time_limit;
+ struct filter_entry_small entries[NUM_FILTER_ENTRIES];
+};
+
+/*
+ * To conserve on space there is a code duplication here (this
+ * is where polymophism would be nice in the kernel). Everything
+ * is duplicated to have a filter with a value of uint32_t instead
+ * of a uint64_t. This saves 20 bytes and the structure size
+ * drops to 44 from 64. The bad part about this is you end
+ * up with two sets of functions. The xxx_small() access
+ * the uint32_t value's where the xxx() the uint64_t values.
+ * This forces the user to keep straight which type of structure
+ * they allocated and which call they need to make. crossing
+ * over calls will create either invalid memory references or
+ * very bad results :)
+ */
+
+#define FILTER_TYPE_MIN 1
+#define FILTER_TYPE_MAX 2
+
+#ifdef _KERNEL
+int setup_time_filter(struct time_filter *tf, int fil_type, uint32_t time_len);
+void reset_time(struct time_filter *tf, uint32_t time_len);
+void forward_filter_clock(struct time_filter *tf, uint32_t ticks_forward);
+void tick_filter_clock(struct time_filter *tf, uint32_t now);
+uint32_t apply_filter_min(struct time_filter *tf, uint64_t value, uint32_t now);
+uint32_t apply_filter_max(struct time_filter *tf, uint64_t value, uint32_t now);
+void filter_reduce_by(struct time_filter *tf, uint64_t reduce_by, uint32_t now);
+void filter_increase_by(struct time_filter *tf, uint64_t incr_by, uint32_t now);
+static uint64_t inline
+get_filter_value(struct time_filter *tf)
+{
+ return(tf->entries[0].value);
+}
+
+static uint32_t inline
+get_cur_timelim(struct time_filter *tf)
+{
+ return(tf->cur_time_limit);
+}
+
+
+int setup_time_filter_small(struct time_filter_small *tf,
+ int fil_type, uint32_t time_len);
+void reset_time_small(struct time_filter_small *tf, uint32_t time_len);
+void forward_filter_clock_small(struct time_filter_small *tf,
+ uint32_t ticks_forward);
+void tick_filter_clock_small(struct time_filter_small *tf, uint32_t now);
+uint32_t apply_filter_min_small(struct time_filter_small *tf,
+ uint32_t value, uint32_t now);
+uint32_t apply_filter_max_small(struct time_filter_small *tf,
+ uint32_t value, uint32_t now);
+void filter_reduce_by_small(struct time_filter_small *tf,
+ uint32_t reduce_by, uint32_t now);
+void filter_increase_by_small(struct time_filter_small *tf,
+ uint32_t incr_by, uint32_t now);
+static uint64_t inline
+get_filter_value_small(struct time_filter_small *tf)
+{
+ return(tf->entries[0].value);
+}
+
+static uint32_t inline
+get_cur_timelim_small(struct time_filter_small *tf)
+{
+ return(tf->cur_time_limit);
+}
+
+
+#endif
+#endif

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