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This file is larger than 256 KB, so syntax highlighting was skipped.
Index: bbr.c
===================================================================
--- bbr.c
+++ bbr.c
@@ -1,7 +1,5 @@
/*-
- * Copyright (c) 2016-9
- * Netflix Inc.
- * All rights reserved.
+ * Copyright (c) 2016-20 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -1853,28 +1851,6 @@
&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
- KMOD_TCPSTAT_INC(tcps_progdrops);
-#endif
- return (1);
- }
- }
- return (0);
-}
-
static void
bbr_counter_destroy(void)
{
@@ -1884,6 +1860,8 @@
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_nohdwr_pacing_enobuf);
+ counter_u64_free(bbr_hdwr_pacing_enobuf);
counter_u64_free(bbr_flows_whdwr_pacing);
counter_u64_free(bbr_flows_nohdwr_pacing);
@@ -4643,7 +4621,8 @@
/* Its not time yet */
return (0);
}
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
return (1);
}
@@ -4815,9 +4794,8 @@
}
/*
- * Persists timer, here we simply need to setup the
- * FORCE-DATA flag the output routine will send
- * the one byte send.
+ * Here we send a KEEP-ALIVE like probe to the
+ * peer, we do not send data.
*
* We only return 1, saying don't proceed, if all timers
* are stopped (destroyed PCB?).
@@ -4845,7 +4823,8 @@
/*
* Have we exceeded the user specified progress time?
*/
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
goto out;
}
@@ -4859,6 +4838,7 @@
(ticks - tp->t_rcvtime >= tcp_maxpersistidle ||
ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
KMOD_TCPSTAT_INC(tcps_persistdrop);
+ tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
goto out;
}
@@ -4875,6 +4855,7 @@
if (tp->t_state > TCPS_CLOSE_WAIT &&
(ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
KMOD_TCPSTAT_INC(tcps_persistdrop);
+ tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
goto out;
}
@@ -4947,6 +4928,7 @@
return (1);
dropit:
KMOD_TCPSTAT_INC(tcps_keepdrops);
+ tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX);
tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
return (1);
}
@@ -5058,8 +5040,9 @@
* retransmit interval. Back off to a longer retransmit interval
* and retransmit one segment.
*/
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
retval = 1;
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT);
goto out;
}
@@ -5078,6 +5061,7 @@
tp->t_rxtshift = TCP_MAXRXTSHIFT;
KMOD_TCPSTAT_INC(tcps_timeoutdrop);
retval = 1;
+ tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
tcp_set_inp_to_drop(bbr->rc_inp,
(tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT));
goto out;
@@ -8050,6 +8034,9 @@
* to reset him.
*/
*ret_val = 1;
+ tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
+ /* tcp_close will kill the inp pre-log the Reset */
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
tp = tcp_close(tp);
ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen);
BBR_STAT_INC(bbr_dropped_af_data);
@@ -8132,7 +8119,6 @@
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
@@ -8390,66 +8376,12 @@
return (0);
}
/*
- * Process segments with URG.
+ * We don't support urgent data but
+ * drag along the up just to make sure
+ * if there is a stack switch no one
+ * is surprised.
*/
- 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 */
+ tp->rcv_up = tp->rcv_nxt;
INP_WLOCK_ASSERT(tp->t_inpcb);
/*
@@ -9010,6 +8942,7 @@
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->iss) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9207,6 +9140,7 @@
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->snd_una) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9218,6 +9152,7 @@
* data), a valid ACK, a FIN, or a RST.
*/
if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
} else if (thflags & TH_SYN) {
@@ -9253,6 +9188,7 @@
* "LAND" DoS attack.
*/
if (SEQ_LT(th->th_seq, tp->irs)) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9519,7 +9455,8 @@
return (ret_val);
}
if (sbavail(&so->so_snd)) {
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9614,7 +9551,8 @@
return (ret_val);
}
if (sbavail(&so->so_snd)) {
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9630,6 +9568,9 @@
if (bbr->rc_allow_data_af_clo == 0) {
close_now:
+ tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
+ /* tcp_close will kill the inp pre-log the Reset */
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
tp = tcp_close(tp);
KMOD_TCPSTAT_INC(tcps_rcvafterclose);
ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen));
@@ -9762,7 +9703,8 @@
tcp_state_change(tp, TCPS_FIN_WAIT_2);
}
if (sbavail(&so->so_snd)) {
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9874,7 +9816,8 @@
return (1);
}
if (sbavail(&so->so_snd)) {
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -9986,7 +9929,8 @@
return (1);
}
if (sbavail(&so->so_snd)) {
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -10102,7 +10046,8 @@
return (ret_val);
}
if (sbavail(&so->so_snd)) {
- if (bbr_progress_timeout_check(bbr)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -11700,6 +11645,8 @@
* 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 (thflags & TH_FIN)
+ tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_FIN);
if (bbr->r_state != tp->t_state)
bbr_set_state(tp, bbr, tiwin);
@@ -11738,6 +11685,7 @@
*/
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))) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -11967,14 +11915,7 @@
bbr_do_error_accounting(tp, bbr, rsm, len, error);
return;
}
- if ((tp->t_flags & TF_FORCEDATA) && len == 1) {
- /* Window probe */
- KMOD_TCPSTAT_INC(tcps_sndprobe);
-#ifdef STATS
- stats_voi_update_abs_u32(tp->t_stats,
- VOI_TCP_RETXPB, len);
-#endif
- } else if (rsm) {
+ if (rsm) {
if (rsm->r_flags & BBR_TLP) {
/*
* TLP should not count in retran count, but in its
@@ -12239,7 +12180,6 @@
}
/* 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)
@@ -12576,47 +12516,6 @@
}
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
@@ -12672,7 +12571,7 @@
*/
len = 0;
}
- if ((tp->t_flags & TF_FORCEDATA) && (bbr->rc_in_persist)) {
+ if (bbr->rc_in_persist) {
/*
* We are in persists, figure out if
* a retransmit is available (maybe the previous
@@ -12968,9 +12867,6 @@
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;
}
@@ -13011,7 +12907,7 @@
goto send;
}
/*
- * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW
+ * Send if we owe the peer an ACK, RST, SYN. ACKNOW
* is also a catch-all for the retransmit timer timeout case.
*/
if (tp->t_flags & TF_ACKNOW) {
@@ -13020,9 +12916,6 @@
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.
@@ -13087,7 +12980,6 @@
}
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;
@@ -13584,8 +13476,6 @@
KMOD_TCPSTAT_INC(tcps_sndacks);
else if (flags & (TH_SYN | TH_FIN | TH_RST))
KMOD_TCPSTAT_INC(tcps_sndctrl);
- else if (SEQ_GT(tp->snd_up, tp->snd_una))
- KMOD_TCPSTAT_INC(tcps_sndurg);
else
KMOD_TCPSTAT_INC(tcps_sndwinup);
@@ -13769,17 +13659,11 @@
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 */
+ /*
+ * We don't support urgent data, but drag along
+ * the pointer in case of a stack switch.
+ */
+ tp->snd_up = tp->snd_una;
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (to.to_flags & TOF_SIGNATURE) {
@@ -14120,8 +14004,7 @@
*/
return (0);
}
- if (((tp->t_flags & TF_FORCEDATA) == 0) ||
- (bbr->rc_in_persist == 0)) {
+ if (bbr->rc_in_persist == 0) {
/*
* Advance snd_nxt over sequence space of this segment.
*/
@@ -14249,7 +14132,6 @@
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
@@ -14279,7 +14161,6 @@
}
/* 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);
@@ -14394,7 +14275,6 @@
((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
@@ -14411,10 +14291,14 @@
}
rsm = NULL;
sack_rxmit = 0;
- tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA);
+ tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
goto again;
}
skip_again:
+ if ((error == 0) && (flags & TH_FIN))
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_FIN);
+ if ((error == 0) && (flags & TH_RST))
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
if (((flags & (TH_RST | TH_SYN | TH_FIN)) == 0) && tot_len) {
/*
* Calculate/Re-Calculate the hptsi slot in usecs based on
@@ -14424,7 +14308,7 @@
if (bbr->rc_no_pacing)
slot = 0;
}
- tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA);
+ tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
enobufs:
if (bbr->rc_use_google == 0)
bbr_check_bbr_for_state(bbr, cts, __LINE__, 0);
Index: rack.c
===================================================================
--- rack.c
+++ rack.c
@@ -1,5 +1,5 @@
/*-
- * Copyright (c) 2016-9 Netflix, Inc.
+ * Copyright (c) 2016-20 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -57,10 +57,12 @@
#include <sys/qmath.h>
#include <sys/tree.h>
#include <sys/stats.h> /* Must come after qmath.h and tree.h */
+#else
+#include <sys/tree.h>
#endif
#include <sys/refcount.h>
-#include <sys/tree.h>
#include <sys/queue.h>
+#include <sys/tim_filter.h>
#include <sys/smp.h>
#include <sys/kthread.h>
#include <sys/kern_prefetch.h>
@@ -91,10 +93,14 @@
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_hpts.h>
+#include <netinet/tcp_ratelimit.h>
#include <netinet/tcpip.h>
#include <netinet/cc/cc.h>
#include <netinet/tcp_fastopen.h>
#include <netinet/tcp_lro.h>
+#ifdef NETFLIX_SHARED_CWND
+#include <netinet/tcp_shared_cwnd.h>
+#endif
#ifdef TCPDEBUG
#include <netinet/tcp_debug.h>
#endif /* TCPDEBUG */
@@ -169,6 +175,8 @@
*
*/
static int32_t rack_tlp_thresh = 1;
+static int32_t rack_tlp_limit = 2; /* No more than 2 TLPs w-out new data */
+static int32_t rack_tlp_use_greater = 1;
static int32_t rack_reorder_thresh = 2;
static int32_t rack_reorder_fade = 60000; /* 0 - never fade, def 60,000
* - 60 seconds */
@@ -177,18 +185,24 @@
static uint32_t rack_highest_move_thresh_seen = 0;
static int32_t rack_pkt_delay = 1;
-static int32_t rack_min_pace_time = 0;
static int32_t rack_early_recovery = 1;
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_verbose_logging = 0;
static int32_t rack_ignore_data_after_close = 1;
-static int32_t use_rack_cheat = 1;
+static int32_t rack_enable_shared_cwnd = 0;
+static int32_t rack_limits_scwnd = 1;
+static int32_t rack_enable_mqueue_for_nonpaced = 0;
+static int32_t rack_disable_prr = 0;
+static int32_t use_rack_rr = 1;
+static int32_t rack_non_rxt_use_cr = 0; /* does a non-rxt in recovery use the configured rate (ss/ca)? */
static int32_t rack_persist_min = 250; /* 250ms */
-static int32_t rack_persist_max = 1000; /* 1 Second */
+static int32_t rack_persist_max = 2000; /* 2 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 */
-
+static int32_t rack_hw_tls_max_seg = 3; /* 3 means use hw-tls single segment */
+static int32_t rack_default_init_window = 0; /* Use system default */
+static int32_t rack_limit_time_with_srtt = 0;
+static int32_t rack_hw_pace_adjust = 0;
/*
* Currently regular tcp has a rto_min of 30ms
* the backoff goes 12 times so that ends up
@@ -195,6 +209,10 @@
* being a total of 122.850 seconds before a
* connection is killed.
*/
+static uint32_t rack_def_data_window = 20;
+static uint32_t rack_goal_bdp = 2;
+static uint32_t rack_min_srtts = 1;
+static uint32_t rack_min_measure_usec = 0;
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 = 4000; /* 4 seconds */
@@ -204,6 +222,10 @@
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_wma_divisor = 8; /* For WMA calculation */
+static int32_t rack_cwnd_block_ends_measure = 0;
+static int32_t rack_rwnd_block_ends_measure = 0;
+
static int32_t rack_lower_cwnd_at_tlp = 0;
static int32_t rack_use_proportional_reduce = 0;
static int32_t rack_proportional_rate = 10;
@@ -210,10 +232,68 @@
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_use_sack_filter = 1;
static int32_t rack_tlp_threshold_use = TLP_USE_TWO_ONE;
-static int32_t rack_per_of_gp = 50;
+static uint16_t rack_per_of_gp_ss = 250; /* 250 % slow-start */
+static uint16_t rack_per_of_gp_ca = 200; /* 200 % congestion-avoidance */
+static uint16_t rack_per_of_gp_rec = 200; /* 200 % of bw */
+
+/* Probertt */
+static uint16_t rack_per_of_gp_probertt = 60; /* 60% of bw */
+static uint16_t rack_per_of_gp_lowthresh = 40; /* 40% is bottom */
+static uint16_t rack_per_of_gp_probertt_reduce = 10; /* 10% reduction */
+static uint16_t rack_atexit_prtt_hbp = 130; /* Clamp to 130% on exit prtt if highly buffered path */
+static uint16_t rack_atexit_prtt = 130; /* Clamp to 100% on exit prtt if non highly buffered path */
+
+static uint32_t rack_max_drain_wait = 2; /* How man gp srtt's before we give up draining */
+static uint32_t rack_must_drain = 1; /* How many GP srtt's we *must* wait */
+static uint32_t rack_probertt_use_min_rtt_entry = 1; /* Use the min to calculate the goal else gp_srtt */
+static uint32_t rack_probertt_use_min_rtt_exit = 0;
+static uint32_t rack_probe_rtt_sets_cwnd = 0;
+static uint32_t rack_probe_rtt_safety_val = 2000000; /* No more than 2 sec in probe-rtt */
+static uint32_t rack_time_between_probertt = 9600000; /* 9.6 sec in us */
+static uint32_t rack_probertt_gpsrtt_cnt_mul = 0; /* How many srtt periods does probe-rtt last top fraction */
+static uint32_t rack_probertt_gpsrtt_cnt_div = 0; /* How many srtt periods does probe-rtt last bottom fraction */
+static uint32_t rack_min_probertt_hold = 200000; /* Equal to delayed ack time */
+static uint32_t rack_probertt_filter_life = 10000000;
+static uint32_t rack_probertt_lower_within = 10;
+static uint32_t rack_min_rtt_movement = 250; /* Must move at least 250 useconds to count as a lowering */
+static int32_t rack_pace_one_seg = 0; /* Shall we pace for less than 1.4Meg 1MSS at a time */
+static int32_t rack_probertt_clear_is = 1;
+static int32_t rack_max_drain_hbp = 1; /* Extra drain times gpsrtt for highly buffered paths */
+static int32_t rack_hbp_thresh = 3; /* what is the divisor max_rtt/min_rtt to decided a hbp */
+
+
+/* Part of pacing */
+static int32_t rack_max_per_above = 30; /* When we go to increment stop if above 100+this% */
+
+/* Timely information */
+/* Combine these two gives the range of 'no change' to bw */
+/* ie the up/down provide the upper and lower bound */
+static int32_t rack_gp_per_bw_mul_up = 2; /* 2% */
+static int32_t rack_gp_per_bw_mul_down = 4; /* 4% */
+static int32_t rack_gp_rtt_maxmul = 3; /* 3 x maxmin */
+static int32_t rack_gp_rtt_minmul = 1; /* minrtt + (minrtt/mindiv) is lower rtt */
+static int32_t rack_gp_rtt_mindiv = 4; /* minrtt + (minrtt * minmul/mindiv) is lower rtt */
+static int32_t rack_gp_decrease_per = 20; /* 20% decrease in multipler */
+static int32_t rack_gp_increase_per = 2; /* 2% increase in multipler */
+static int32_t rack_per_lower_bound = 50; /* Don't allow to drop below this multiplier */
+static int32_t rack_per_upper_bound_ss = 0; /* Don't allow SS to grow above this */
+static int32_t rack_per_upper_bound_ca = 0; /* Don't allow CA to grow above this */
+static int32_t rack_do_dyn_mul = 0; /* Are the rack gp multipliers dynamic */
+static int32_t rack_gp_no_rec_chg = 1; /* Prohibit recovery from reducing it's multiplier */
+static int32_t rack_timely_dec_clear = 6; /* Do we clear decrement count at a value (6)? */
+static int32_t rack_timely_max_push_rise = 3; /* One round of pushing */
+static int32_t rack_timely_max_push_drop = 3; /* Three round of pushing */
+static int32_t rack_timely_min_segs = 4; /* 4 segment minimum */
+static int32_t rack_use_max_for_nobackoff = 0;
+static int32_t rack_timely_int_timely_only = 0; /* do interim timely's only use the timely algo (no b/w changes)? */
+static int32_t rack_timely_no_stopping = 0;
+static int32_t rack_down_raise_thresh = 100;
+static int32_t rack_req_segs = 1;
+
+/* Weird delayed ack mode */
+static int32_t rack_use_imac_dack = 0;
/* Rack specific counters */
counter_u64_t rack_badfr;
counter_u64_t rack_badfr_bytes;
@@ -266,6 +346,7 @@
counter_u64_t rack_input_idle_reduces;
counter_u64_t rack_collapsed_win;
counter_u64_t rack_tlp_does_nada;
+counter_u64_t rack_try_scwnd;
/* Counters for HW TLS */
counter_u64_t rack_tls_rwnd;
@@ -312,6 +393,8 @@
struct inpcb *inp, struct tcpcb *tp);
static int32_t rack_ctor(void *mem, int32_t size, void *arg, int32_t how);
static void
+rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack, uint32_t line);
+static void
rack_do_segment(struct mbuf *m, struct tcphdr *th,
struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
uint8_t iptos);
@@ -319,6 +402,15 @@
static void
rack_earlier_retran(struct tcpcb *tp, struct rack_sendmap *rsm,
uint32_t t, uint32_t cts);
+static void
+rack_log_alt_to_to_cancel(struct tcp_rack *rack,
+ uint32_t flex1, uint32_t flex2,
+ uint32_t flex3, uint32_t flex4,
+ uint32_t flex5, uint32_t flex6,
+ uint16_t flex7, uint8_t mod);
+static void
+rack_log_pacing_delay_calc(struct tcp_rack *rack, uint32_t len, uint32_t slot,
+ uint64_t bw_est, uint64_t bw, uint64_t len_time, int method, int line, struct rack_sendmap *rsm);
static struct rack_sendmap *
rack_find_high_nonack(struct tcp_rack *rack,
struct rack_sendmap *rsm);
@@ -328,6 +420,11 @@
static int
rack_get_sockopt(struct socket *so, struct sockopt *sopt,
struct inpcb *inp, struct tcpcb *tp, struct tcp_rack *rack);
+static void
+rack_do_goodput_measurement(struct tcpcb *tp, struct tcp_rack *rack,
+ tcp_seq th_ack, int line);
+static uint32_t
+rack_get_pacing_len(struct tcp_rack *rack, uint64_t bw, uint32_t mss);
static int32_t rack_handoff_ok(struct tcpcb *tp);
static int32_t rack_init(struct tcpcb *tp);
static void rack_init_sysctls(void);
@@ -337,11 +434,11 @@
static void
rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len,
uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t ts,
- uint8_t pass, struct rack_sendmap *hintrsm);
+ uint8_t pass, struct rack_sendmap *hintrsm, uint32_t us_cts);
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, int num);
+static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num, struct rack_sendmap *rsm);
static int32_t rack_output(struct tcpcb *tp);
static uint32_t
@@ -369,7 +466,7 @@
struct rack_sendmap *rsm, uint32_t ts);
static int
rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
- struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type);
+ struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, tcp_seq th_ack);
static int32_t tcp_addrack(module_t mod, int32_t type, void *data);
static int
rack_do_close_wait(struct mbuf *m, struct tcphdr *th,
@@ -410,7 +507,8 @@
struct rack_sendmap *
tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack,
uint32_t tsused);
-static void tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt);
+static void tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt,
+ uint32_t len, uint32_t us_tim, int confidence, struct rack_sendmap *rsm, uint16_t rtrcnt);
static void
tcp_rack_partialack(struct tcpcb *tp, struct tcphdr *th);
@@ -488,6 +586,7 @@
counter_u64_zero(rack_enter_tlp_calc);
counter_u64_zero(rack_progress_drops);
counter_u64_zero(rack_tlp_does_nada);
+ counter_u64_zero(rack_try_scwnd);
counter_u64_zero(rack_collapsed_win);
}
@@ -502,7 +601,26 @@
{
struct sysctl_oid *rack_counters;
struct sysctl_oid *rack_attack;
+ struct sysctl_oid *rack_pacing;
+ struct sysctl_oid *rack_timely;
+ struct sysctl_oid *rack_timers;
+ struct sysctl_oid *rack_tlp;
+ struct sysctl_oid *rack_misc;
+ struct sysctl_oid *rack_measure;
+ struct sysctl_oid *rack_probertt;
+ rack_attack = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO,
+ "sack_attack",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Rack Sack Attack Counters and Controls");
+ rack_counters = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO,
+ "stats",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Rack Counters");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
OID_AUTO, "rate_sample_method", CTLFLAG_RW,
@@ -511,166 +629,586 @@
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)? ");
+ &rack_hw_tls_max_seg , 3,
+ "What is the maximum number of full TLS records that will be sent at once");
+ /* Probe rtt related controls */
+ rack_probertt = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO,
+ "probertt",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "ProbeRTT related Controls");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "exit_per_hpb", CTLFLAG_RW,
+ &rack_atexit_prtt_hbp, 130,
+ "What percentage above goodput do we clamp CA/SS to at exit on high-BDP path 110%");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "exit_per_nonhpb", CTLFLAG_RW,
+ &rack_atexit_prtt, 130,
+ "What percentage above goodput do we clamp CA/SS to at exit on a non high-BDP path 100%");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "gp_per_mul", CTLFLAG_RW,
+ &rack_per_of_gp_probertt, 60,
+ "What percentage of goodput do we pace at in probertt");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "gp_per_reduce", CTLFLAG_RW,
+ &rack_per_of_gp_probertt_reduce, 10,
+ "What percentage of goodput do we reduce every gp_srtt");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "gp_per_low", CTLFLAG_RW,
+ &rack_per_of_gp_lowthresh, 40,
+ "What percentage of goodput do we allow the multiplier to fall to");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "time_between", CTLFLAG_RW,
+ & rack_time_between_probertt, 96000000,
+ "How many useconds between the lowest rtt falling must past before we enter probertt");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "safety", CTLFLAG_RW,
+ &rack_probe_rtt_safety_val, 2000000,
+ "If not zero, provides a maximum usecond that you can stay in probertt (2sec = 2000000)");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "sets_cwnd", CTLFLAG_RW,
+ &rack_probe_rtt_sets_cwnd, 0,
+ "Do we set the cwnd too (if always_lower is on)");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "maxdrainsrtts", CTLFLAG_RW,
+ &rack_max_drain_wait, 2,
+ "Maximum number of gp_srtt's to hold in drain waiting for flight to reach goal");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "mustdrainsrtts", CTLFLAG_RW,
+ &rack_must_drain, 1,
+ "We must drain this many gp_srtt's waiting for flight to reach goal");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "goal_use_min_entry", CTLFLAG_RW,
+ &rack_probertt_use_min_rtt_entry, 1,
+ "Should we use the min-rtt to calculate the goal rtt (else gp_srtt) at entry");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "goal_use_min_exit", CTLFLAG_RW,
+ &rack_probertt_use_min_rtt_exit, 0,
+ "How to set cwnd at exit, 0 - dynamic, 1 - use min-rtt, 2 - use curgprtt, 3 - entry gp-rtt");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "length_div", CTLFLAG_RW,
+ &rack_probertt_gpsrtt_cnt_div, 0,
+ "How many recent goodput srtt periods plus hold tim does probertt last (bottom of fraction)");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "length_mul", CTLFLAG_RW,
+ &rack_probertt_gpsrtt_cnt_mul, 0,
+ "How many recent goodput srtt periods plus hold tim does probertt last (top of fraction)");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "holdtim_at_target", CTLFLAG_RW,
+ &rack_min_probertt_hold, 200000,
+ "What is the minimum time we hold probertt at target");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "filter_life", CTLFLAG_RW,
+ &rack_probertt_filter_life, 10000000,
+ "What is the time for the filters life in useconds");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "lower_within", CTLFLAG_RW,
+ &rack_probertt_lower_within, 10,
+ "If the rtt goes lower within this percentage of the time, go into probe-rtt");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "must_move", CTLFLAG_RW,
+ &rack_min_rtt_movement, 250,
+ "How much is the minimum movement in rtt to count as a drop for probertt purposes");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "clear_is_cnts", CTLFLAG_RW,
+ &rack_probertt_clear_is, 1,
+ "Do we clear I/S counts on exiting probe-rtt");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "hbp_extra_drain", CTLFLAG_RW,
+ &rack_max_drain_hbp, 1,
+ "How many extra drain gpsrtt's do we get in highly buffered paths");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_probertt),
+ OID_AUTO, "hbp_threshold", CTLFLAG_RW,
+ &rack_hbp_thresh, 3,
+ "We are highly buffered if min_rtt_seen / max_rtt_seen > this-threshold");
+ /* Pacing related sysctls */
+ rack_pacing = SYSCTL_ADD_NODE(&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");
+ OID_AUTO,
+ "pacing",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Pacing related Controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "max_pace_over", CTLFLAG_RW,
+ &rack_max_per_above, 30,
+ "What is the maximum allowable percentage that we can pace above (so 30 = 130% of our goal)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "pace_to_one", CTLFLAG_RW,
+ &rack_pace_one_seg, 0,
+ "Do we allow low b/w pacing of 1MSS instead of two");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "limit_wsrtt", CTLFLAG_RW,
+ &rack_limit_time_with_srtt, 0,
+ "Do we limit pacing time based on srtt");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "init_win", CTLFLAG_RW,
+ &rack_default_init_window, 0,
+ "Do we have a rack initial window 0 = system default");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "hw_pacing_adjust", CTLFLAG_RW,
+ &rack_hw_pace_adjust, 0,
+ "What percentage do we raise the MSS by (11 = 1.1%)");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "gp_per_ss", CTLFLAG_RW,
+ &rack_per_of_gp_ss, 250,
+ "If non zero, what percentage of goodput to pace at in slow start");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "gp_per_ca", CTLFLAG_RW,
+ &rack_per_of_gp_ca, 150,
+ "If non zero, what percentage of goodput to pace at in congestion avoidance");
+ SYSCTL_ADD_U16(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "gp_per_rec", CTLFLAG_RW,
+ &rack_per_of_gp_rec, 200,
+ "If non zero, what percentage of goodput to pace at in recovery");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "pace_max_seg", CTLFLAG_RW,
+ &rack_hptsi_segments, 40,
+ "What size is the max for TSO segments in pacing and burst mitigation");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_pacing),
+ OID_AUTO, "burst_reduces", CTLFLAG_RW,
+ &rack_slot_reduction, 4,
+ "When doing only burst mitigation what is the reduce divisor");
+ 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?");
+ OID_AUTO, "use_pacing", CTLFLAG_RW,
+ &rack_pace_every_seg, 0,
+ "If set we use pacing, if clear we use only the original burst mitigation");
- SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ rack_timely = SYSCTL_ADD_NODE(&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");
+ OID_AUTO,
+ "timely",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Rack Timely RTT Controls");
+ /* Timely based GP dynmics */
SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "upper", CTLFLAG_RW,
+ &rack_gp_per_bw_mul_up, 2,
+ "Rack timely upper range for equal b/w (in percentage)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "lower", CTLFLAG_RW,
+ &rack_gp_per_bw_mul_down, 4,
+ "Rack timely lower range for equal b/w (in percentage)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "rtt_max_mul", CTLFLAG_RW,
+ &rack_gp_rtt_maxmul, 3,
+ "Rack timely multipler of lowest rtt for rtt_max");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "rtt_min_div", CTLFLAG_RW,
+ &rack_gp_rtt_mindiv, 4,
+ "Rack timely divisor used for rtt + (rtt * mul/divisor) for check for lower rtt");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "rtt_min_mul", CTLFLAG_RW,
+ &rack_gp_rtt_minmul, 1,
+ "Rack timely multiplier used for rtt + (rtt * mul/divisor) for check for lower rtt");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "decrease", CTLFLAG_RW,
+ &rack_gp_decrease_per, 20,
+ "Rack timely decrease percentage of our GP multiplication factor");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "increase", CTLFLAG_RW,
+ &rack_gp_increase_per, 2,
+ "Rack timely increase perentage of our GP multiplication factor");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "lowerbound", CTLFLAG_RW,
+ &rack_per_lower_bound, 50,
+ "Rack timely lowest percentage we allow GP multiplier to fall to");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "upperboundss", CTLFLAG_RW,
+ &rack_per_upper_bound_ss, 0,
+ "Rack timely higest percentage we allow GP multiplier in SS to raise to (0 is no upperbound)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "upperboundca", CTLFLAG_RW,
+ &rack_per_upper_bound_ca, 0,
+ "Rack timely higest percentage we allow GP multiplier to CA raise to (0 is no upperbound)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "dynamicgp", CTLFLAG_RW,
+ &rack_do_dyn_mul, 0,
+ "Rack timely do we enable dynmaic timely goodput by default");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "no_rec_red", CTLFLAG_RW,
+ &rack_gp_no_rec_chg, 1,
+ "Rack timely do we prohibit the recovery multiplier from being lowered");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "red_clear_cnt", CTLFLAG_RW,
+ &rack_timely_dec_clear, 6,
+ "Rack timely what threshold do we count to before another boost during b/w decent");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "max_push_rise", CTLFLAG_RW,
+ &rack_timely_max_push_rise, 3,
+ "Rack timely how many times do we push up with b/w increase");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "max_push_drop", CTLFLAG_RW,
+ &rack_timely_max_push_drop, 3,
+ "Rack timely how many times do we push back on b/w decent");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "min_segs", CTLFLAG_RW,
+ &rack_timely_min_segs, 4,
+ "Rack timely when setting the cwnd what is the min num segments");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "noback_max", CTLFLAG_RW,
+ &rack_use_max_for_nobackoff, 0,
+ "Rack timely when deciding if to backoff on a loss, do we use under max rtt else min");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "interim_timely_only", CTLFLAG_RW,
+ &rack_timely_int_timely_only, 0,
+ "Rack timely when doing interim timely's do we only do timely (no b/w consideration)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "nonstop", CTLFLAG_RW,
+ &rack_timely_no_stopping, 0,
+ "Rack timely don't stop increase");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "dec_raise_thresh", CTLFLAG_RW,
+ &rack_down_raise_thresh, 100,
+ "If the CA or SS is below this threshold raise on the first 3 b/w lowers (0=always)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timely),
+ OID_AUTO, "bottom_drag_segs", CTLFLAG_RW,
+ &rack_req_segs, 1,
+ "Bottom dragging if not these many segments outstanding and room");
+
+ /* TLP and Rack related parameters */
+ rack_tlp = SYSCTL_ADD_NODE(&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?");
+ OID_AUTO,
+ "tlp",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "TLP and Rack related Controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "use_rrr", CTLFLAG_RW,
+ &use_rack_rr, 1,
+ "Do we use Rack Rapid Recovery");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "nonrxt_use_cr", CTLFLAG_RW,
+ &rack_non_rxt_use_cr, 0,
+ "Do we use ss/ca rate if in recovery we are transmitting a new data chunk");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
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_CHILDREN(rack_tlp),
+ OID_AUTO, "limit", CTLFLAG_RW,
+ &rack_tlp_limit, 2,
+ "How many TLP's can be sent without sending new data");
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_CHILDREN(rack_tlp),
+ OID_AUTO, "use_greater", CTLFLAG_RW,
+ &rack_tlp_use_greater, 1,
+ "Should we use the rack_rtt time if its greater than srtt");
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");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "sackfiltering", CTLFLAG_RW,
- &rack_use_sack_filter, 1,
- "Do we use sack filtering?");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "delayed_ack", CTLFLAG_RW,
- &rack_delayed_ack_time, 200,
- "Delayed ack time (200ms)");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "tlpminto", CTLFLAG_RW,
&rack_tlp_min, 10,
"TLP minimum timeout per the specification (10ms)");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "send_oldest", CTLFLAG_RW,
- &rack_always_send_oldest, 1,
+ &rack_always_send_oldest, 0,
"Should we always send the oldest TLP and RACK-TLP");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_tlp),
OID_AUTO, "rack_tlimit", CTLFLAG_RW,
&rack_limited_retran, 0,
"How many times can a rack timeout drive out sends");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "tlp_retry", CTLFLAG_RW,
+ &rack_tlp_max_resend, 2,
+ "How many times does TLP retry a single segment or multiple with no ACK");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "tlp_cwnd_flag", CTLFLAG_RW,
+ &rack_lower_cwnd_at_tlp, 0,
+ "When a TLP completes a retran should we enter recovery");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "reorder_thresh", CTLFLAG_RW,
+ &rack_reorder_thresh, 2,
+ "What factor for rack will be added when seeing reordering (shift right)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW,
+ &rack_tlp_thresh, 1,
+ "What divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "reorder_fade", CTLFLAG_RW,
+ &rack_reorder_fade, 0,
+ "Does reorder detection fade, if so how many ms (0 means never)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_tlp),
+ OID_AUTO, "pktdelay", CTLFLAG_RW,
+ &rack_pkt_delay, 1,
+ "Extra RACK time (in ms) besides reordering thresh");
+
+ /* Timer related controls */
+ rack_timers = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO,
+ "timers",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Timer related controls");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timers),
+ 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_timers),
+ OID_AUTO, "persmax", CTLFLAG_RW,
+ &rack_persist_max, 2000,
+ "What is the largest delay in milliseconds between persists");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timers),
+ OID_AUTO, "delayed_ack", CTLFLAG_RW,
+ &rack_delayed_ack_time, 200,
+ "Delayed ack time (200ms)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "minrto", CTLFLAG_RW,
&rack_rto_min, 0,
"Minimum RTO in ms -- set with caution below 1000 due to TLP");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_timers),
OID_AUTO, "maxrto", CTLFLAG_RW,
&rack_rto_max, 0,
"Maxiumum RTO in ms -- should be at least as large as min_rto");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_timers),
+ OID_AUTO, "minto", CTLFLAG_RW,
+ &rack_min_to, 1,
+ "Minimum rack timeout in milliseconds");
+ /* Measure controls */
+ rack_measure = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "tlp_retry", CTLFLAG_RW,
- &rack_tlp_max_resend, 2,
- "How many times does TLP retry a single segment or multiple with no ACK");
+ OID_AUTO,
+ "measure",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Measure related controls");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "wma_divisor", CTLFLAG_RW,
+ &rack_wma_divisor, 8,
+ "When doing b/w calculation what is the divisor for the WMA");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "end_cwnd", CTLFLAG_RW,
+ &rack_cwnd_block_ends_measure, 0,
+ "Does a cwnd just-return end the measurement window (app limited)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "end_rwnd", CTLFLAG_RW,
+ &rack_rwnd_block_ends_measure, 0,
+ "Does an rwnd just-return end the measurement window (app limited -- not persists)");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "min_target", CTLFLAG_RW,
+ &rack_def_data_window, 20,
+ "What is the minimum target window (in mss) for a GP measurements");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "goal_bdp", CTLFLAG_RW,
+ &rack_goal_bdp, 2,
+ "What is the goal BDP to measure");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "min_srtts", CTLFLAG_RW,
+ &rack_min_srtts, 1,
+ "What is the goal BDP to measure");
+ SYSCTL_ADD_U32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_measure),
+ OID_AUTO, "min_measure_tim", CTLFLAG_RW,
+ &rack_min_measure_usec, 0,
+ "What is the Minimum time time for a measurement if 0, this is off");
+ /* Misc rack controls */
+ rack_misc = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_sysctl_root),
+ OID_AUTO,
+ "misc",
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Misc related controls");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "shared_cwnd", CTLFLAG_RW,
+ &rack_enable_shared_cwnd, 0,
+ "Should RACK try to use the shared cwnd on connections where allowed");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "limits_on_scwnd", CTLFLAG_RW,
+ &rack_limits_scwnd, 1,
+ "Should RACK place low end time limits on the shared cwnd feature");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "non_paced_lro_queue", CTLFLAG_RW,
+ &rack_enable_mqueue_for_nonpaced, 0,
+ "Should RACK use mbuf queuing for non-paced connections");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "iMac_dack", CTLFLAG_RW,
+ &rack_use_imac_dack, 0,
+ "Should RACK try to emulate iMac delayed ack");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "no_prr", CTLFLAG_RW,
+ &rack_disable_prr, 0,
+ "Should RACK not use prr and only pace (must have pacing on)");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "bb_verbose", CTLFLAG_RW,
+ &rack_verbose_logging, 0,
+ "Should RACK black box logging be verbose");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ OID_AUTO, "data_after_close", CTLFLAG_RW,
+ &rack_ignore_data_after_close, 1,
+ "Do we hold off sending a RST until all pending data is ack'd");
+ SYSCTL_ADD_S32(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_misc),
+ 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_misc),
OID_AUTO, "recovery_loss_prop", CTLFLAG_RW,
&rack_use_proportional_reduce, 0,
"Should we proportionaly reduce cwnd based on the number of losses ");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "recovery_prop", CTLFLAG_RW,
&rack_proportional_rate, 10,
"What percent reduction per loss");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "tlp_cwnd_flag", CTLFLAG_RW,
- &rack_lower_cwnd_at_tlp, 0,
- "When a TLP completes a retran should we enter recovery?");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "hptsi_reduces", CTLFLAG_RW,
- &rack_slot_reduction, 4,
- "When setting a slot should we reduce by divisor");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "hptsi_every_seg", CTLFLAG_RW,
- &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, 40,
- "Should we pace out only a limited size of segments");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "prr_sendalot", CTLFLAG_RW,
&rack_send_a_lot_in_prr, 1,
"Send a lot in prr");
SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "minto", CTLFLAG_RW,
- &rack_min_to, 1,
- "Minimum rack timeout in milliseconds");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
+ SYSCTL_CHILDREN(rack_misc),
OID_AUTO, "earlyrecovery", CTLFLAG_RW,
&rack_early_recovery, 1,
"Do we do early recovery with rack");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "reorder_thresh", CTLFLAG_RW,
- &rack_reorder_thresh, 2,
- "What factor for rack will be added when seeing reordering (shift right)");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW,
- &rack_tlp_thresh, 1,
- "what divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "reorder_fade", CTLFLAG_RW,
- &rack_reorder_fade, 0,
- "Does reorder detection fade, if so how many ms (0 means never)");
- SYSCTL_ADD_S32(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO, "pktdelay", CTLFLAG_RW,
- &rack_pkt_delay, 1,
- "Extra RACK time (in ms) besides reordering thresh");
-
- rack_counters = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
- SYSCTL_CHILDREN(rack_sysctl_root),
- OID_AUTO,
- "stats",
- CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "Rack Counters");
+ /* Sack Attacker detection stuff */
+ 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 SACKs");
+ 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");
+ /* Counters */
rack_badfr = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
SYSCTL_CHILDREN(rack_counters),
@@ -723,7 +1261,6 @@
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_counters),
@@ -747,20 +1284,19 @@
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "rack_to_tot", CTLFLAG_RD,
&rack_to_tot,
- "Total number of times the rack to expired?");
+ "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_counters),
OID_AUTO, "arm_rack", CTLFLAG_RD,
&rack_to_arm_rack,
- "Total number of times the rack timer armed?");
+ "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_counters),
OID_AUTO, "arm_tlp", CTLFLAG_RD,
&rack_to_arm_tlp,
- "Total number of times the tlp timer armed?");
-
+ "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,
@@ -767,12 +1303,12 @@
SYSCTL_CHILDREN(rack_counters),
OID_AUTO, "calc_zero", CTLFLAG_RD,
&rack_calc_zero,
- "Total number of times pacing time worked out to 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?");
+ "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_counters),
@@ -839,7 +1375,6 @@
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_counters),
@@ -870,78 +1405,6 @@
OID_AUTO, "hit_tlp_method2", CTLFLAG_RD,
&rack_used_tlpmethod2,
"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,
- "sack_attack",
- CTLFLAG_RW | CTLFLAG_MPSAFE, 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),
@@ -978,6 +1441,12 @@
OID_AUTO, "tlp_nada", CTLFLAG_RD,
&rack_tlp_does_nada,
"Total number of nada tlp calls");
+ rack_try_scwnd = counter_u64_alloc(M_WAITOK);
+ SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
+ SYSCTL_CHILDREN(rack_counters),
+ OID_AUTO, "tried_scwnd", CTLFLAG_RD,
+ &rack_try_scwnd,
+ "Total number of scwnd attempts");
rack_tls_rwnd = counter_u64_alloc(M_WAITOK);
SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
@@ -985,7 +1454,6 @@
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),
@@ -992,7 +1460,6 @@
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),
@@ -999,7 +1466,6 @@
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),
@@ -1006,7 +1472,6 @@
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),
@@ -1013,7 +1478,6 @@
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),
@@ -1020,7 +1484,6 @@
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),
@@ -1033,7 +1496,6 @@
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,
@@ -1091,30 +1553,151 @@
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)
+static uint32_t
+rc_init_window(struct tcp_rack *rack)
{
- if (tp->t_maxunacktime && tp->t_acktime && TSTMP_GT(ticks, tp->t_acktime)) {
- if ((ticks - tp->t_acktime) >= tp->t_maxunacktime) {
+ uint32_t win;
+
+ if (rack->rc_init_win == 0) {
+ /*
+ * Nothing set by the user, use the system stack
+ * default.
+ */
+ return(tcp_compute_initwnd(tcp_maxseg(rack->rc_tp)));
+ }
+ win = ctf_fixed_maxseg(rack->rc_tp) * rack->rc_init_win;
+ return(win);
+}
+
+static uint64_t
+rack_get_fixed_pacing_bw(struct tcp_rack *rack)
+{
+ if (IN_RECOVERY(rack->rc_tp->t_flags))
+ return (rack->r_ctl.rc_fixed_pacing_rate_rec);
+ else if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh)
+ return (rack->r_ctl.rc_fixed_pacing_rate_ss);
+ else
+ return (rack->r_ctl.rc_fixed_pacing_rate_ca);
+}
+
+static uint64_t
+rack_get_bw(struct tcp_rack *rack)
+{
+ if (rack->use_fixed_rate) {
+ /* Return the fixed pacing rate */
+ return (rack_get_fixed_pacing_bw(rack));
+ }
+ if (rack->r_ctl.gp_bw == 0) {
+ /*
+ * We have yet no b/w measurement,
+ * if we have a user set initial bw
+ * return it. If we don't have that and
+ * we have an srtt, use the tcp IW (10) to
+ * calculate a fictional b/w over the SRTT
+ * which is more or less a guess. Note
+ * we don't use our IW from rack on purpose
+ * so if we have like IW=30, we are not
+ * calculating a "huge" b/w.
+ */
+ uint64_t bw, srtt;
+ if (rack->r_ctl.init_rate)
+ return (rack->r_ctl.init_rate);
+
+ /* Has the user set a max peak rate? */
+#ifdef NETFLIX_PEAKRATE
+ if (rack->rc_tp->t_maxpeakrate)
+ return (rack->rc_tp->t_maxpeakrate);
+#endif
+ /* Ok lets come up with the IW guess, if we have a srtt */
+ if (rack->rc_tp->t_srtt == 0) {
/*
- * There is an assumption that the caller
- * will drop the connection so we will
- * increment the counters here.
+ * Go with old pacing method
+ * i.e. burst mitigation only.
*/
- struct tcp_rack *rack;
- rack = (struct tcp_rack *)tp->t_fb_ptr;
- counter_u64_add(rack_progress_drops, 1);
-#ifdef NETFLIX_STATS
- KMOD_TCPSTAT_INC(tcps_progdrops);
+ return (0);
+ }
+ /* Ok lets get the initial TCP win (not racks) */
+ bw = tcp_compute_initwnd(tcp_maxseg(rack->rc_tp));
+ srtt = ((uint64_t)TICKS_2_USEC(rack->rc_tp->t_srtt) >> TCP_RTT_SHIFT);
+ bw *= (uint64_t)USECS_IN_SECOND;
+ bw /= srtt;
+ return (bw);
+ } else {
+ uint64_t bw;
+
+ if(rack->r_ctl.num_avg >= RACK_REQ_AVG) {
+ /* Averaging is done, we can return the value */
+ bw = rack->r_ctl.gp_bw;
+ } else {
+ /* Still doing initial average must calculate */
+ bw = rack->r_ctl.gp_bw / rack->r_ctl.num_avg;
+ }
+#ifdef NETFLIX_PEAKRATE
+ if ((rack->rc_tp->t_maxpeakrate) &&
+ (bw > rack->rc_tp->t_maxpeakrate)) {
+ /* The user has set a peak rate to pace at
+ * don't allow us to pace faster than that.
+ */
+ return (rack->rc_tp->t_maxpeakrate);
+ }
#endif
- rack_log_progress_event(rack, tp, ticks, PROGRESS_DROP, __LINE__);
- return (1);
+ return (bw);
+ }
+}
+
+static uint16_t
+rack_get_output_gain(struct tcp_rack *rack, struct rack_sendmap *rsm)
+{
+ if (rack->use_fixed_rate) {
+ return (100);
+ } else if (rack->in_probe_rtt && (rsm == NULL))
+ return(rack->r_ctl.rack_per_of_gp_probertt);
+ else if ((IN_RECOVERY(rack->rc_tp->t_flags) &&
+ rack->r_ctl.rack_per_of_gp_rec)) {
+ if (rsm) {
+ /* a retransmission always use the recovery rate */
+ return(rack->r_ctl.rack_per_of_gp_rec);
+ } else if (rack->rack_rec_nonrxt_use_cr) {
+ /* Directed to use the configured rate */
+ goto configured_rate;
+ } else if (rack->rack_no_prr &&
+ (rack->r_ctl.rack_per_of_gp_rec > 100)) {
+ /* No PRR, lets just use the b/w estimate only */
+ return(100);
+ } else {
+ /*
+ * Here we may have a non-retransmit but we
+ * have no overrides, so just use the recovery
+ * rate (prr is in effect).
+ */
+ return(rack->r_ctl.rack_per_of_gp_rec);
}
}
- return (0);
+configured_rate:
+ /* For the configured rate we look at our cwnd vs the ssthresh */
+ if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh)
+ return (rack->r_ctl.rack_per_of_gp_ss);
+ else
+ return(rack->r_ctl.rack_per_of_gp_ca);
}
+static uint64_t
+rack_get_output_bw(struct tcp_rack *rack, uint64_t bw, struct rack_sendmap *rsm)
+{
+ /*
+ * We allow rack_per_of_gp_xx to dictate our bw rate we want.
+ */
+ uint64_t bw_est;
+ uint64_t gain;
+ gain = (uint64_t)rack_get_output_gain(rack, rsm);
+ bw_est = bw * gain;
+ bw_est /= (uint64_t)100;
+ /* Never fall below the minimum (def 64kbps) */
+ if (bw_est < RACK_MIN_BW)
+ bw_est = RACK_MIN_BW;
+ return (bw_est);
+}
static void
rack_log_retran_reason(struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t tsused, uint32_t thresh, int mod)
@@ -1122,6 +1705,19 @@
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
struct timeval tv;
+
+ if ((mod != 1) && (rack_verbose_logging == 0)) {
+ /*
+ * We get 3 values currently for mod
+ * 1 - We are retransmitting and this tells the reason.
+ * 2 - We are clearing a dup-ack count.
+ * 3 - We are incrementing a dup-ack count.
+ *
+ * The clear/increment are only logged
+ * if you have BBverbose on.
+ */
+ return;
+ }
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.flex1 = tsused;
log.u_bbr.flex2 = thresh;
@@ -1153,7 +1749,7 @@
memset(&log.u_bbr, 0, sizeof(log.u_bbr));
log.u_bbr.flex1 = TICKS_2_MSEC(rack->rc_tp->t_srtt >> TCP_RTT_SHIFT);
- log.u_bbr.flex2 = to;
+ log.u_bbr.flex2 = to * 1000;
log.u_bbr.flex3 = rack->r_ctl.rc_hpts_flags;
log.u_bbr.flex4 = slot;
log.u_bbr.flex5 = rack->rc_inp->inp_hptsslot;
@@ -1160,7 +1756,10 @@
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;
+ if (rack->rack_no_prr)
+ log.u_bbr.pkts_out = 0;
+ else
+ 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;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
@@ -1174,7 +1773,7 @@
}
static void
-rack_log_to_event(struct tcp_rack *rack, int32_t to_num, int no)
+rack_log_to_event(struct tcp_rack *rack, int32_t to_num, struct rack_sendmap *rsm)
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
@@ -1186,8 +1785,14 @@
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;
- log.u_bbr.flex3 = no;
- log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
+ if (rsm == NULL)
+ log.u_bbr.flex3 = 0;
+ else
+ log.u_bbr.flex3 = rsm->r_end - rsm->r_start;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex5 = 0;
+ else
+ 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,
@@ -1199,27 +1804,64 @@
}
static void
-rack_log_rtt_upd(struct tcpcb *tp, struct tcp_rack *rack, int32_t t,
- uint32_t o_srtt, uint32_t o_var)
+rack_log_rtt_upd(struct tcpcb *tp, struct tcp_rack *rack, uint32_t t, uint32_t len,
+ struct rack_sendmap *rsm, int conf)
{
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 = t;
- log.u_bbr.flex2 = o_srtt;
- log.u_bbr.flex3 = o_var;
- log.u_bbr.flex4 = rack->r_ctl.rack_rs.rs_rtt_lowest;
- log.u_bbr.flex5 = rack->r_ctl.rack_rs.rs_rtt_highest;
+ log.u_bbr.flex2 = len;
+ log.u_bbr.flex3 = rack->r_ctl.rc_rack_min_rtt * HPTS_USEC_IN_MSEC;
+ log.u_bbr.flex4 = rack->r_ctl.rack_rs.rs_rtt_lowest * HPTS_USEC_IN_MSEC;
+ log.u_bbr.flex5 = rack->r_ctl.rack_rs.rs_rtt_highest * HPTS_USEC_IN_MSEC;
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.flex7 = conf;
+ log.u_bbr.rttProp = (uint64_t)rack->r_ctl.rack_rs.rs_rtt_tot * (uint64_t)HPTS_USEC_IN_MSEC;
log.u_bbr.flex8 = rack->r_ctl.rc_rate_sample_method;
- log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
+ if (rack->rack_no_prr)
+ log.u_bbr.pkts_out = 0;
+ else
+ log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.delivered = rack->r_ctl.rack_rs.rs_us_rtt;
+ log.u_bbr.pkts_out = rack->r_ctl.rack_rs.rs_flags;
log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ if (rsm) {
+ log.u_bbr.pkt_epoch = rsm->r_start;
+ log.u_bbr.lost = rsm->r_end;
+ log.u_bbr.cwnd_gain = rsm->r_rtr_cnt;
+ } else {
+
+ /* Its a SYN */
+ log.u_bbr.pkt_epoch = rack->rc_tp->iss;
+ log.u_bbr.lost = 0;
+ log.u_bbr.cwnd_gain = 0;
+ }
+ /* Write out general bits of interest rrs here */
+ log.u_bbr.use_lt_bw = rack->rc_highly_buffered;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->forced_ack;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->rc_gp_dyn_mul;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->in_probe_rtt;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->measure_saw_probe_rtt;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->app_limited_needs_set;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->rc_gp_filled;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->rc_dragged_bottom;
+ log.u_bbr.applimited = rack->r_ctl.rc_target_probertt_flight;
+ log.u_bbr.epoch = rack->r_ctl.rc_time_probertt_starts;
+ log.u_bbr.lt_epoch = rack->r_ctl.rc_time_probertt_entered;
+ log.u_bbr.cur_del_rate = rack->r_ctl.rc_lower_rtt_us_cts;
+ log.u_bbr.delRate = rack->r_ctl.rc_gp_srtt;
TCP_LOG_EVENTP(tp, NULL,
&rack->rc_inp->inp_socket->so_rcv,
&rack->rc_inp->inp_socket->so_snd,
@@ -1285,26 +1927,28 @@
}
static void
-rack_log_type_bbrsnd(struct tcp_rack *rack, uint32_t len, uint32_t slot, uint32_t cts)
+rack_log_type_bbrsnd(struct tcp_rack *rack, uint32_t len, uint32_t slot, uint32_t cts, struct timeval *tv)
{
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;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex2 = 0;
+ else
+ 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;
- log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.timeStamp = cts;
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, &tv);
+ 0, &log, false, tv);
}
}
@@ -1320,10 +1964,14 @@
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;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex5 = 0;
+ else
+ 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;
+ log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
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,
@@ -1362,7 +2010,8 @@
}
static void
-rack_log_type_just_return(struct tcp_rack *rack, uint32_t cts, uint32_t tlen, uint32_t slot, uint8_t hpts_calling)
+rack_log_type_just_return(struct tcp_rack *rack, uint32_t cts, uint32_t tlen, uint32_t slot,
+ uint8_t hpts_calling, int reason, uint32_t cwnd_to_use)
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
@@ -1373,9 +2022,14 @@
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.flex4 = reason;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex5 = 0;
+ else
+ log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
log.u_bbr.flex7 = hpts_calling;
log.u_bbr.flex8 = rack->rc_in_persist;
+ log.u_bbr.lt_epoch = cwnd_to_use;
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,
@@ -1387,28 +2041,66 @@
}
static void
-rack_log_to_cancel(struct tcp_rack *rack, int32_t hpts_removed, int line)
+rack_log_to_cancel(struct tcp_rack *rack, int32_t hpts_removed, int line, uint32_t us_cts,
+ struct timeval *tv, uint32_t flags_on_entry)
{
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 = line;
- 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.flex2 = rack->r_ctl.rc_last_output_to;
+ log.u_bbr.flex3 = flags_on_entry;
+ log.u_bbr.flex4 = us_cts;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex5 = 0;
+ else
+ 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;
- log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.flex7 = hpts_removed;
+ log.u_bbr.flex8 = 1;
+ log.u_bbr.applimited = rack->r_ctl.rc_hpts_flags;
+ log.u_bbr.timeStamp = us_cts;
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, tv);
+ }
+}
+
+static void
+rack_log_alt_to_to_cancel(struct tcp_rack *rack,
+ uint32_t flex1, uint32_t flex2,
+ uint32_t flex3, uint32_t flex4,
+ uint32_t flex5, uint32_t flex6,
+ uint16_t flex7, uint8_t mod)
+{
+ if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+ struct timeval tv;
+
+ if (mod == 1) {
+ /* No you can't use 1, its for the real to cancel */
+ return;
+ }
+ memset(&log.u_bbr, 0, sizeof(log.u_bbr));
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ 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;
+ log.u_bbr.flex8 = mod;
+ 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, &tv);
}
}
@@ -1426,7 +2118,10 @@
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;
- log.u_bbr.flex6 = rack->r_ctl.rc_prr_sndcnt;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex6 = 0;
+ else
+ 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,
@@ -1438,7 +2133,7 @@
}
static void
-rack_log_to_prr(struct tcp_rack *rack, int frm)
+rack_log_to_prr(struct tcp_rack *rack, int frm, int orig_cwnd)
{
if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
@@ -1447,11 +2142,15 @@
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;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex3 = 0;
+ else
+ 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.pkts_out = orig_cwnd;
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,
@@ -1498,11 +2197,21 @@
static void
rack_counter_destroy(void)
{
+ counter_u64_free(rack_ack_total);
+ counter_u64_free(rack_express_sack);
+ counter_u64_free(rack_sack_total);
+ counter_u64_free(rack_move_none);
+ counter_u64_free(rack_move_some);
+ counter_u64_free(rack_sack_attacks_detected);
+ counter_u64_free(rack_sack_attacks_reversed);
+ counter_u64_free(rack_sack_used_next_merge);
+ counter_u64_free(rack_sack_used_prev_merge);
counter_u64_free(rack_badfr);
counter_u64_free(rack_badfr_bytes);
counter_u64_free(rack_rtm_prr_retran);
counter_u64_free(rack_rtm_prr_newdata);
counter_u64_free(rack_timestamp_mismatch);
+ counter_u64_free(rack_find_high);
counter_u64_free(rack_reorder_seen);
counter_u64_free(rack_tlp_tot);
counter_u64_free(rack_tlp_newdata);
@@ -1512,27 +2221,39 @@
counter_u64_free(rack_to_tot);
counter_u64_free(rack_to_arm_rack);
counter_u64_free(rack_to_arm_tlp);
+ counter_u64_free(rack_calc_zero);
+ counter_u64_free(rack_calc_nonzero);
counter_u64_free(rack_paced_segments);
counter_u64_free(rack_unpaced_segments);
counter_u64_free(rack_saw_enobuf);
counter_u64_free(rack_saw_enetunreach);
+ counter_u64_free(rack_to_alloc);
counter_u64_free(rack_to_alloc_hard);
counter_u64_free(rack_to_alloc_emerg);
- counter_u64_free(rack_sack_proc_all);
- counter_u64_free(rack_sack_proc_short);
- 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_sack_proc_all);
+ counter_u64_free(rack_sack_proc_restart);
+ counter_u64_free(rack_sack_proc_short);
counter_u64_free(rack_enter_tlp_calc);
counter_u64_free(rack_used_tlpmethod);
counter_u64_free(rack_used_tlpmethod2);
+ counter_u64_free(rack_sack_skipped_acked);
+ counter_u64_free(rack_sack_splits);
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_u64_free(rack_try_scwnd);
+ counter_u64_free(rack_tls_rwnd);
+ counter_u64_free(rack_tls_cwnd);
+ counter_u64_free(rack_tls_app);
+ counter_u64_free(rack_tls_other);
+ counter_u64_free(rack_tls_filled);
+ counter_u64_free(rack_tls_rxt);
+ counter_u64_free(rack_tls_tlp);
+ counter_u64_free(rack_per_timer_hole);
COUNTER_ARRAY_FREE(rack_out_size, TCP_MSS_ACCT_SIZE);
COUNTER_ARRAY_FREE(rack_opts_arry, RACK_OPTS_SIZE);
}
@@ -1606,10 +2327,32 @@
static void
rack_free(struct tcp_rack *rack, struct rack_sendmap *rsm)
{
+ if (rsm->r_flags & RACK_APP_LIMITED) {
+ if (rack->r_ctl.rc_app_limited_cnt > 0) {
+ rack->r_ctl.rc_app_limited_cnt--;
+ }
+ }
if (rsm->r_limit_type) {
/* currently there is only one limit type */
rack->r_ctl.rc_num_split_allocs--;
}
+ if (rsm == rack->r_ctl.rc_first_appl) {
+ if (rack->r_ctl.rc_app_limited_cnt == 0)
+ rack->r_ctl.rc_first_appl = NULL;
+ else {
+ /* Follow the next one out */
+ struct rack_sendmap fe;
+
+ fe.r_start = rsm->r_nseq_appl;
+ rack->r_ctl.rc_first_appl = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
+ }
+ }
+ if (rsm == rack->r_ctl.rc_resend)
+ rack->r_ctl.rc_resend = NULL;
+ if (rsm == rack->r_ctl.rc_rsm_at_retran)
+ rack->r_ctl.rc_rsm_at_retran = NULL;
+ if (rsm == rack->r_ctl.rc_end_appl)
+ rack->r_ctl.rc_end_appl = NULL;
if (rack->r_ctl.rc_tlpsend == rsm)
rack->r_ctl.rc_tlpsend = NULL;
if (rack->r_ctl.rc_sacklast == rsm)
@@ -1625,6 +2368,1578 @@
uma_zfree(rack_zone, rsm);
}
+static uint32_t
+rack_get_measure_window(struct tcpcb *tp, struct tcp_rack *rack)
+{
+ uint64_t srtt, bw, len, tim;
+ uint32_t segsiz, def_len, minl;
+
+ segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
+ def_len = rack_def_data_window * segsiz;
+ if (rack->rc_gp_filled == 0) {
+ /*
+ * We have no measurement (IW is in flight?) so
+ * we can only guess using our data_window sysctl
+ * value (usually 100MSS).
+ */
+ return (def_len);
+ }
+ /*
+ * Now we have a number of factors to consider.
+ *
+ * 1) We have a desired BDP which is usually
+ * at least 2.
+ * 2) We have a minimum number of rtt's usually 1 SRTT
+ * but we allow it too to be more.
+ * 3) We want to make sure a measurement last N useconds (if
+ * we have set rack_min_measure_usec.
+ *
+ * We handle the first concern here by trying to create a data
+ * window of max(rack_def_data_window, DesiredBDP). The
+ * second concern we handle in not letting the measurement
+ * window end normally until at least the required SRTT's
+ * have gone by which is done further below in
+ * rack_enough_for_measurement(). Finally the third concern
+ * we also handle here by calculating how long that time
+ * would take at the current BW and then return the
+ * max of our first calculation and that length. Note
+ * that if rack_min_measure_usec is 0, we don't deal
+ * with concern 3. Also for both Concern 1 and 3 an
+ * application limited period could end the measurement
+ * earlier.
+ *
+ * So lets calculate the BDP with the "known" b/w using
+ * the SRTT has our rtt and then multiply it by the
+ * goal.
+ */
+ bw = rack_get_bw(rack);
+ srtt = ((uint64_t)TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT);
+ len = bw * srtt;
+ len /= (uint64_t)HPTS_USEC_IN_SEC;
+ len *= max(1, rack_goal_bdp);
+ /* Now we need to round up to the nearest MSS */
+ len = roundup(len, segsiz);
+ if (rack_min_measure_usec) {
+ /* Now calculate our min length for this b/w */
+ tim = rack_min_measure_usec;
+ minl = (tim * bw) / (uint64_t)HPTS_USEC_IN_SEC;
+ if (minl == 0)
+ minl = 1;
+ minl = roundup(minl, segsiz);
+ if (len < minl)
+ len = minl;
+ }
+ /*
+ * Now if we have a very small window we want
+ * to attempt to get the window that is
+ * as small as possible. This happens on
+ * low b/w connections and we don't want to
+ * span huge numbers of rtt's between measurements.
+ *
+ * We basically include 2 over our "MIN window" so
+ * that the measurement can be shortened (possibly) by
+ * an ack'ed packet.
+ */
+ if (len < def_len)
+ return (max((uint32_t)len, ((MIN_GP_WIN+2) * segsiz)));
+ else
+ return (max((uint32_t)len, def_len));
+
+}
+
+static int
+rack_enough_for_measurement(struct tcpcb *tp, struct tcp_rack *rack, tcp_seq th_ack)
+{
+ uint32_t tim, srtts, segsiz;
+
+ /*
+ * Has enough time passed for the GP measurement to be valid?
+ */
+ if ((tp->snd_max == tp->snd_una) ||
+ (th_ack == tp->snd_max)){
+ /* All is acked */
+ return (1);
+ }
+ if (SEQ_LT(th_ack, tp->gput_seq)) {
+ /* Not enough bytes yet */
+ return (0);
+ }
+ segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
+ if (SEQ_LT(th_ack, tp->gput_ack) &&
+ ((th_ack - tp->gput_seq) < max(rc_init_window(rack), (MIN_GP_WIN * segsiz)))) {
+ /* Not enough bytes yet */
+ return (0);
+ }
+ if (rack->r_ctl.rc_first_appl &&
+ (rack->r_ctl.rc_first_appl->r_start == th_ack)) {
+ /*
+ * We are up to the app limited point
+ * we have to measure irrespective of the time..
+ */
+ return (1);
+ }
+ /* Now what about time? */
+ srtts = (rack->r_ctl.rc_gp_srtt * rack_min_srtts);
+ tim = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time) - tp->gput_ts;
+ if (tim >= srtts) {
+ return (1);
+ }
+ /* Nope not even a full SRTT has passed */
+ return (0);
+}
+
+
+static void
+rack_log_timely(struct tcp_rack *rack,
+ uint32_t logged, uint64_t cur_bw, uint64_t low_bnd,
+ uint64_t up_bnd, int line, uint8_t method)
+{
+ 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 = logged;
+ log.u_bbr.flex2 = rack->rc_gp_timely_inc_cnt;
+ log.u_bbr.flex2 <<= 4;
+ log.u_bbr.flex2 |= rack->rc_gp_timely_dec_cnt;
+ log.u_bbr.flex2 <<= 4;
+ log.u_bbr.flex2 |= rack->rc_gp_incr;
+ log.u_bbr.flex2 <<= 4;
+ log.u_bbr.flex2 |= rack->rc_gp_bwred;
+ log.u_bbr.flex3 = rack->rc_gp_incr;
+ log.u_bbr.flex4 = rack->r_ctl.rack_per_of_gp_ss;
+ log.u_bbr.flex5 = rack->r_ctl.rack_per_of_gp_ca;
+ log.u_bbr.flex6 = rack->r_ctl.rack_per_of_gp_rec;
+ log.u_bbr.flex7 = rack->rc_gp_bwred;
+ log.u_bbr.flex8 = method;
+ log.u_bbr.cur_del_rate = cur_bw;
+ log.u_bbr.delRate = low_bnd;
+ log.u_bbr.bw_inuse = up_bnd;
+ log.u_bbr.rttProp = rack_get_bw(rack);
+ log.u_bbr.pkt_epoch = line;
+ log.u_bbr.pkts_out = rack->r_ctl.rc_rtt_diff;
+ 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.epoch = rack->r_ctl.rc_gp_srtt;
+ log.u_bbr.lt_epoch = rack->r_ctl.rc_prev_gp_srtt;
+ log.u_bbr.cwnd_gain = rack->rc_dragged_bottom;
+ log.u_bbr.cwnd_gain <<= 1;
+ log.u_bbr.cwnd_gain |= rack->rc_gp_saw_rec;
+ log.u_bbr.cwnd_gain <<= 1;
+ log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ss;
+ log.u_bbr.cwnd_gain <<= 1;
+ log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ca;
+ log.u_bbr.lost = rack->r_ctl.rc_loss_count;
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ TCP_TIMELY_WORK, 0,
+ 0, &log, false, &tv);
+ }
+}
+
+static int
+rack_bw_can_be_raised(struct tcp_rack *rack, uint64_t cur_bw, uint64_t last_bw_est, uint16_t mult)
+{
+ /*
+ * Before we increase we need to know if
+ * the estimate just made was less than
+ * our pacing goal (i.e. (cur_bw * mult) > last_bw_est)
+ *
+ * If we already are pacing at a fast enough
+ * rate to push us faster there is no sense of
+ * increasing.
+ *
+ * We first caculate our actual pacing rate (ss or ca multipler
+ * times our cur_bw).
+ *
+ * Then we take the last measured rate and multipy by our
+ * maximum pacing overage to give us a max allowable rate.
+ *
+ * If our act_rate is smaller than our max_allowable rate
+ * then we should increase. Else we should hold steady.
+ *
+ */
+ uint64_t act_rate, max_allow_rate;
+
+ if (rack_timely_no_stopping)
+ return (1);
+
+ if ((cur_bw == 0) || (last_bw_est == 0)) {
+ /*
+ * Initial startup case or
+ * everything is acked case.
+ */
+ rack_log_timely(rack, mult, cur_bw, 0, 0,
+ __LINE__, 9);
+ return (1);
+ }
+ if (mult <= 100) {
+ /*
+ * We can always pace at or slightly above our rate.
+ */
+ rack_log_timely(rack, mult, cur_bw, 0, 0,
+ __LINE__, 9);
+ return (1);
+ }
+ act_rate = cur_bw * (uint64_t)mult;
+ act_rate /= 100;
+ max_allow_rate = last_bw_est * ((uint64_t)rack_max_per_above + (uint64_t)100);
+ max_allow_rate /= 100;
+ if (act_rate < max_allow_rate) {
+ /*
+ * Here the rate we are actually pacing at
+ * is smaller than 10% above our last measurement.
+ * This means we are pacing below what we would
+ * like to try to achieve (plus some wiggle room).
+ */
+ rack_log_timely(rack, mult, cur_bw, act_rate, max_allow_rate,
+ __LINE__, 9);
+ return (1);
+ } else {
+ /*
+ * Here we are already pacing at least rack_max_per_above(10%)
+ * what we are getting back. This indicates most likely
+ * that we are being limited (cwnd/rwnd/app) and can't
+ * get any more b/w. There is no sense of trying to
+ * raise up the pacing rate its not speeding us up
+ * and we already are pacing faster than we are getting.
+ */
+ rack_log_timely(rack, mult, cur_bw, act_rate, max_allow_rate,
+ __LINE__, 8);
+ return (0);
+ }
+}
+
+static void
+rack_validate_multipliers_at_or_above100(struct tcp_rack *rack)
+{
+ /*
+ * When we drag bottom, we want to assure
+ * that no multiplier is below 1.0, if so
+ * we want to restore it to at least that.
+ */
+ if (rack->r_ctl.rack_per_of_gp_rec < 100) {
+ /* This is unlikely we usually do not touch recovery */
+ rack->r_ctl.rack_per_of_gp_rec = 100;
+ }
+ if (rack->r_ctl.rack_per_of_gp_ca < 100) {
+ rack->r_ctl.rack_per_of_gp_ca = 100;
+ }
+ if (rack->r_ctl.rack_per_of_gp_ss < 100) {
+ rack->r_ctl.rack_per_of_gp_ss = 100;
+ }
+}
+
+static void
+rack_validate_multipliers_at_or_below_100(struct tcp_rack *rack)
+{
+ if (rack->r_ctl.rack_per_of_gp_ca > 100) {
+ rack->r_ctl.rack_per_of_gp_ca = 100;
+ }
+ if (rack->r_ctl.rack_per_of_gp_ss > 100) {
+ rack->r_ctl.rack_per_of_gp_ss = 100;
+ }
+}
+
+static void
+rack_increase_bw_mul(struct tcp_rack *rack, int timely_says, uint64_t cur_bw, uint64_t last_bw_est, int override)
+{
+ int32_t calc, logged, plus;
+
+ logged = 0;
+
+ if (override) {
+ /*
+ * override is passed when we are
+ * loosing b/w and making one last
+ * gasp at trying to not loose out
+ * to a new-reno flow.
+ */
+ goto extra_boost;
+ }
+ /* In classic timely we boost by 5x if we have 5 increases in a row, lets not */
+ if (rack->rc_gp_incr &&
+ ((rack->rc_gp_timely_inc_cnt + 1) >= RACK_TIMELY_CNT_BOOST)) {
+ /*
+ * Reset and get 5 strokes more before the boost. Note
+ * that the count is 0 based so we have to add one.
+ */
+extra_boost:
+ plus = (uint32_t)rack_gp_increase_per * RACK_TIMELY_CNT_BOOST;
+ rack->rc_gp_timely_inc_cnt = 0;
+ } else
+ plus = (uint32_t)rack_gp_increase_per;
+ /* Must be at least 1% increase for true timely increases */
+ if ((plus < 1) &&
+ ((rack->r_ctl.rc_rtt_diff <= 0) || (timely_says <= 0)))
+ plus = 1;
+ if (rack->rc_gp_saw_rec &&
+ (rack->rc_gp_no_rec_chg == 0) &&
+ rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
+ rack->r_ctl.rack_per_of_gp_rec)) {
+ /* We have been in recovery ding it too */
+ calc = rack->r_ctl.rack_per_of_gp_rec + plus;
+ if (calc > 0xffff)
+ calc = 0xffff;
+ logged |= 1;
+ rack->r_ctl.rack_per_of_gp_rec = (uint16_t)calc;
+ if (rack_per_upper_bound_ss &&
+ (rack->rc_dragged_bottom == 0) &&
+ (rack->r_ctl.rack_per_of_gp_rec > rack_per_upper_bound_ss))
+ rack->r_ctl.rack_per_of_gp_rec = rack_per_upper_bound_ss;
+ }
+ if (rack->rc_gp_saw_ca &&
+ (rack->rc_gp_saw_ss == 0) &&
+ rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
+ rack->r_ctl.rack_per_of_gp_ca)) {
+ /* In CA */
+ calc = rack->r_ctl.rack_per_of_gp_ca + plus;
+ if (calc > 0xffff)
+ calc = 0xffff;
+ logged |= 2;
+ rack->r_ctl.rack_per_of_gp_ca = (uint16_t)calc;
+ if (rack_per_upper_bound_ca &&
+ (rack->rc_dragged_bottom == 0) &&
+ (rack->r_ctl.rack_per_of_gp_ca > rack_per_upper_bound_ca))
+ rack->r_ctl.rack_per_of_gp_ca = rack_per_upper_bound_ca;
+ }
+ if (rack->rc_gp_saw_ss &&
+ rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
+ rack->r_ctl.rack_per_of_gp_ss)) {
+ /* In SS */
+ calc = rack->r_ctl.rack_per_of_gp_ss + plus;
+ if (calc > 0xffff)
+ calc = 0xffff;
+ rack->r_ctl.rack_per_of_gp_ss = (uint16_t)calc;
+ if (rack_per_upper_bound_ss &&
+ (rack->rc_dragged_bottom == 0) &&
+ (rack->r_ctl.rack_per_of_gp_ss > rack_per_upper_bound_ss))
+ rack->r_ctl.rack_per_of_gp_ss = rack_per_upper_bound_ss;
+ logged |= 4;
+ }
+ if (logged &&
+ (rack->rc_gp_incr == 0)){
+ /* Go into increment mode */
+ rack->rc_gp_incr = 1;
+ rack->rc_gp_timely_inc_cnt = 0;
+ }
+ if (rack->rc_gp_incr &&
+ logged &&
+ (rack->rc_gp_timely_inc_cnt < RACK_TIMELY_CNT_BOOST)) {
+ rack->rc_gp_timely_inc_cnt++;
+ }
+ rack_log_timely(rack, logged, plus, 0, 0,
+ __LINE__, 1);
+}
+
+static uint32_t
+rack_get_decrease(struct tcp_rack *rack, uint32_t curper, int32_t rtt_diff)
+{
+ /*
+ * norm_grad = rtt_diff / minrtt;
+ * new_per = curper * (1 - B * norm_grad)
+ *
+ * B = rack_gp_decrease_per (default 10%)
+ * rtt_dif = input var current rtt-diff
+ * curper = input var current percentage
+ * minrtt = from rack filter
+ *
+ */
+ uint64_t perf;
+
+ perf = (((uint64_t)curper * ((uint64_t)1000000 -
+ ((uint64_t)rack_gp_decrease_per * (uint64_t)10000 *
+ (((uint64_t)rtt_diff * (uint64_t)1000000)/
+ (uint64_t)get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt)))/
+ (uint64_t)1000000)) /
+ (uint64_t)1000000);
+ if (perf > curper) {
+ /* TSNH */
+ perf = curper - 1;
+ }
+ return ((uint32_t)perf);
+}
+
+static uint32_t
+rack_decrease_highrtt(struct tcp_rack *rack, uint32_t curper, uint32_t rtt)
+{
+ /*
+ * highrttthresh
+ * result = curper * (1 - (B * ( 1 - ------ ))
+ * gp_srtt
+ *
+ * B = rack_gp_decrease_per (default 10%)
+ * highrttthresh = filter_min * rack_gp_rtt_maxmul
+ */
+ uint64_t perf;
+ uint32_t highrttthresh;
+
+ highrttthresh = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_maxmul;
+
+ perf = (((uint64_t)curper * ((uint64_t)1000000 -
+ ((uint64_t)rack_gp_decrease_per * ((uint64_t)1000000 -
+ ((uint64_t)highrttthresh * (uint64_t)1000000) /
+ (uint64_t)rtt)) / 100)) /(uint64_t)1000000);
+ return (perf);
+}
+
+
+static void
+rack_decrease_bw_mul(struct tcp_rack *rack, int timely_says, uint32_t rtt, int32_t rtt_diff)
+{
+ uint64_t logvar, logvar2, logvar3;
+ uint32_t logged, new_per, ss_red, ca_red, rec_red, alt, val;
+
+ if (rack->rc_gp_incr) {
+ /* Turn off increment counting */
+ rack->rc_gp_incr = 0;
+ rack->rc_gp_timely_inc_cnt = 0;
+ }
+ ss_red = ca_red = rec_red = 0;
+ logged = 0;
+ /* Calculate the reduction value */
+ if (rtt_diff < 0) {
+ rtt_diff *= -1;
+ }
+ /* Must be at least 1% reduction */
+ if (rack->rc_gp_saw_rec && (rack->rc_gp_no_rec_chg == 0)) {
+ /* We have been in recovery ding it too */
+ if (timely_says == 2) {
+ new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_rec, rtt);
+ alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
+ if (alt < new_per)
+ val = alt;
+ else
+ val = new_per;
+ } else
+ val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
+ if (rack->r_ctl.rack_per_of_gp_rec > val) {
+ rec_red = (rack->r_ctl.rack_per_of_gp_rec - val);
+ rack->r_ctl.rack_per_of_gp_rec = (uint16_t)val;
+ } else {
+ rack->r_ctl.rack_per_of_gp_rec = rack_per_lower_bound;
+ rec_red = 0;
+ }
+ if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_rec)
+ rack->r_ctl.rack_per_of_gp_rec = rack_per_lower_bound;
+ logged |= 1;
+ }
+ if (rack->rc_gp_saw_ss) {
+ /* Sent in SS */
+ if (timely_says == 2) {
+ new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_ss, rtt);
+ alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
+ if (alt < new_per)
+ val = alt;
+ else
+ val = new_per;
+ } else
+ val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ss, rtt_diff);
+ if (rack->r_ctl.rack_per_of_gp_ss > new_per) {
+ ss_red = rack->r_ctl.rack_per_of_gp_ss - val;
+ rack->r_ctl.rack_per_of_gp_ss = (uint16_t)val;
+ } else {
+ ss_red = new_per;
+ rack->r_ctl.rack_per_of_gp_ss = rack_per_lower_bound;
+ logvar = new_per;
+ logvar <<= 32;
+ logvar |= alt;
+ logvar2 = (uint32_t)rtt;
+ logvar2 <<= 32;
+ logvar2 |= (uint32_t)rtt_diff;
+ logvar3 = rack_gp_rtt_maxmul;
+ logvar3 <<= 32;
+ logvar3 |= get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
+ rack_log_timely(rack, timely_says,
+ logvar2, logvar3,
+ logvar, __LINE__, 10);
+ }
+ if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_ss)
+ rack->r_ctl.rack_per_of_gp_ss = rack_per_lower_bound;
+ logged |= 4;
+ } else if (rack->rc_gp_saw_ca) {
+ /* Sent in CA */
+ if (timely_says == 2) {
+ new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_ca, rtt);
+ alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
+ if (alt < new_per)
+ val = alt;
+ else
+ val = new_per;
+ } else
+ val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ca, rtt_diff);
+ if (rack->r_ctl.rack_per_of_gp_ca > val) {
+ ca_red = rack->r_ctl.rack_per_of_gp_ca - val;
+ rack->r_ctl.rack_per_of_gp_ca = (uint16_t)val;
+ } else {
+ rack->r_ctl.rack_per_of_gp_ca = rack_per_lower_bound;
+ ca_red = 0;
+ logvar = new_per;
+ logvar <<= 32;
+ logvar |= alt;
+ logvar2 = (uint32_t)rtt;
+ logvar2 <<= 32;
+ logvar2 |= (uint32_t)rtt_diff;
+ logvar3 = rack_gp_rtt_maxmul;
+ logvar3 <<= 32;
+ logvar3 |= get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
+ rack_log_timely(rack, timely_says,
+ logvar2, logvar3,
+ logvar, __LINE__, 10);
+ }
+ if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_ca)
+ rack->r_ctl.rack_per_of_gp_ca = rack_per_lower_bound;
+ logged |= 2;
+ }
+ if (rack->rc_gp_timely_dec_cnt < 0x7) {
+ rack->rc_gp_timely_dec_cnt++;
+ if (rack_timely_dec_clear &&
+ (rack->rc_gp_timely_dec_cnt == rack_timely_dec_clear))
+ rack->rc_gp_timely_dec_cnt = 0;
+ }
+ logvar = ss_red;
+ logvar <<= 32;
+ logvar |= ca_red;
+ rack_log_timely(rack, logged, rec_red, rack_per_lower_bound, logvar,
+ __LINE__, 2);
+}
+
+static void
+rack_log_rtt_shrinks(struct tcp_rack *rack, uint32_t us_cts,
+ uint32_t rtt, uint32_t line, uint8_t reas)
+{
+ 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 = line;
+ log.u_bbr.flex2 = rack->r_ctl.rc_time_probertt_starts;
+ log.u_bbr.flex3 = rack->r_ctl.rc_lower_rtt_us_cts;
+ log.u_bbr.flex4 = rack->r_ctl.rack_per_of_gp_ss;
+ log.u_bbr.flex5 = rtt;
+ log.u_bbr.flex6 = rack->rc_highly_buffered;
+ log.u_bbr.flex6 <<= 1;
+ log.u_bbr.flex6 |= rack->forced_ack;
+ log.u_bbr.flex6 <<= 1;
+ log.u_bbr.flex6 |= rack->rc_gp_dyn_mul;
+ log.u_bbr.flex6 <<= 1;
+ log.u_bbr.flex6 |= rack->in_probe_rtt;
+ log.u_bbr.flex6 <<= 1;
+ log.u_bbr.flex6 |= rack->measure_saw_probe_rtt;
+ log.u_bbr.flex7 = rack->r_ctl.rack_per_of_gp_probertt;
+ log.u_bbr.pacing_gain = rack->r_ctl.rack_per_of_gp_ca;
+ log.u_bbr.cwnd_gain = rack->r_ctl.rack_per_of_gp_rec;
+ log.u_bbr.flex8 = reas;
+ log.u_bbr.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.delRate = rack_get_bw(rack);
+ log.u_bbr.cur_del_rate = rack->r_ctl.rc_highest_us_rtt;
+ log.u_bbr.cur_del_rate <<= 32;
+ log.u_bbr.cur_del_rate |= rack->r_ctl.rc_lowest_us_rtt;
+ log.u_bbr.applimited = rack->r_ctl.rc_time_probertt_entered;
+ log.u_bbr.pkts_out = rack->r_ctl.rc_rtt_diff;
+ log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
+ log.u_bbr.epoch = rack->r_ctl.rc_gp_srtt;
+ log.u_bbr.lt_epoch = rack->r_ctl.rc_prev_gp_srtt;
+ log.u_bbr.pkt_epoch = rack->r_ctl.rc_lower_rtt_us_cts;
+ log.u_bbr.delivered = rack->r_ctl.rc_target_probertt_flight;
+ log.u_bbr.lost = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
+ log.u_bbr.rttProp = us_cts;
+ log.u_bbr.rttProp <<= 32;
+ log.u_bbr.rttProp |= rack->r_ctl.rc_entry_gp_rtt;
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ BBR_LOG_RTT_SHRINKS, 0,
+ 0, &log, false, &rack->r_ctl.act_rcv_time);
+ }
+}
+
+static void
+rack_set_prtt_target(struct tcp_rack *rack, uint32_t segsiz, uint32_t rtt)
+{
+ uint64_t bwdp;
+
+ bwdp = rack_get_bw(rack);
+ bwdp *= (uint64_t)rtt;
+ bwdp /= (uint64_t)HPTS_USEC_IN_SEC;
+ rack->r_ctl.rc_target_probertt_flight = roundup((uint32_t)bwdp, segsiz);
+ if (rack->r_ctl.rc_target_probertt_flight < (segsiz * rack_timely_min_segs)) {
+ /*
+ * A window protocol must be able to have 4 packets
+ * outstanding as the floor in order to function
+ * (especially considering delayed ack :D).
+ */
+ rack->r_ctl.rc_target_probertt_flight = (segsiz * rack_timely_min_segs);
+ }
+}
+
+static void
+rack_enter_probertt(struct tcp_rack *rack, uint32_t us_cts)
+{
+ /**
+ * ProbeRTT is a bit different in rack_pacing than in
+ * BBR. It is like BBR in that it uses the lowering of
+ * the RTT as a signal that we saw something new and
+ * counts from there for how long between. But it is
+ * different in that its quite simple. It does not
+ * play with the cwnd and wait until we get down
+ * to N segments outstanding and hold that for
+ * 200ms. Instead it just sets the pacing reduction
+ * rate to a set percentage (70 by default) and hold
+ * that for a number of recent GP Srtt's.
+ */
+ uint32_t segsiz;
+
+ if (rack->rc_gp_dyn_mul == 0)
+ return;
+
+ if (rack->rc_tp->snd_max == rack->rc_tp->snd_una) {
+ /* We are idle */
+ return;
+ }
+ if ((rack->rc_tp->t_flags & TF_GPUTINPROG) &&
+ SEQ_GT(rack->rc_tp->snd_una, rack->rc_tp->gput_seq)) {
+ /*
+ * Stop the goodput now, the idea here is
+ * that future measurements with in_probe_rtt
+ * won't register if they are not greater so
+ * we want to get what info (if any) is available
+ * now.
+ */
+ rack_do_goodput_measurement(rack->rc_tp, rack,
+ rack->rc_tp->snd_una, __LINE__);
+ }
+ rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
+ rack->r_ctl.rc_time_probertt_entered = us_cts;
+ segsiz = min(ctf_fixed_maxseg(rack->rc_tp),
+ rack->r_ctl.rc_pace_min_segs);
+ rack->in_probe_rtt = 1;
+ rack->measure_saw_probe_rtt = 1;
+ rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
+ rack->r_ctl.rc_time_probertt_starts = 0;
+ rack->r_ctl.rc_entry_gp_rtt = rack->r_ctl.rc_gp_srtt;
+ if (rack_probertt_use_min_rtt_entry)
+ rack_set_prtt_target(rack, segsiz, get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt));
+ else
+ rack_set_prtt_target(rack, segsiz, rack->r_ctl.rc_gp_srtt);
+ rack_log_rtt_shrinks(rack, us_cts, get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
+ __LINE__, RACK_RTTS_ENTERPROBE);
+}
+
+static void
+rack_exit_probertt(struct tcp_rack *rack, uint32_t us_cts)
+{
+ struct rack_sendmap *rsm;
+ uint32_t segsiz;
+
+ segsiz = min(ctf_fixed_maxseg(rack->rc_tp),
+ rack->r_ctl.rc_pace_min_segs);
+ rack->in_probe_rtt = 0;
+ if ((rack->rc_tp->t_flags & TF_GPUTINPROG) &&
+ SEQ_GT(rack->rc_tp->snd_una, rack->rc_tp->gput_seq)) {
+ /*
+ * Stop the goodput now, the idea here is
+ * that future measurements with in_probe_rtt
+ * won't register if they are not greater so
+ * we want to get what info (if any) is available
+ * now.
+ */
+ rack_do_goodput_measurement(rack->rc_tp, rack,
+ rack->rc_tp->snd_una, __LINE__);
+ } else if (rack->rc_tp->t_flags & TF_GPUTINPROG) {
+ /*
+ * We don't have enough data to make a measurement.
+ * So lets just stop and start here after exiting
+ * probe-rtt. We probably are not interested in
+ * the results anyway.
+ */
+ rack->rc_tp->t_flags &= ~TF_GPUTINPROG;
+ }
+ /*
+ * Measurements through the current snd_max are going
+ * to be limited by the slower pacing rate.
+ *
+ * We need to mark these as app-limited so we
+ * don't collapse the b/w.
+ */
+ rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if (rsm && ((rsm->r_flags & RACK_APP_LIMITED) == 0)) {
+ if (rack->r_ctl.rc_app_limited_cnt == 0)
+ rack->r_ctl.rc_end_appl = rack->r_ctl.rc_first_appl = rsm;
+ else {
+ /*
+ * Go out to the end app limited and mark
+ * this new one as next and move the end_appl up
+ * to this guy.
+ */
+ if (rack->r_ctl.rc_end_appl)
+ rack->r_ctl.rc_end_appl->r_nseq_appl = rsm->r_start;
+ rack->r_ctl.rc_end_appl = rsm;
+ }
+ rsm->r_flags |= RACK_APP_LIMITED;
+ rack->r_ctl.rc_app_limited_cnt++;
+ }
+ /*
+ * Now, we need to examine our pacing rate multipliers.
+ * If its under 100%, we need to kick it back up to
+ * 100%. We also don't let it be over our "max" above
+ * the actual rate i.e. 100% + rack_clamp_atexit_prtt.
+ * Note setting clamp_atexit_prtt to 0 has the effect
+ * of setting CA/SS to 100% always at exit (which is
+ * the default behavior).
+ */
+ if (rack_probertt_clear_is) {
+ rack->rc_gp_incr = 0;
+ rack->rc_gp_bwred = 0;
+ rack->rc_gp_timely_inc_cnt = 0;
+ rack->rc_gp_timely_dec_cnt = 0;
+ }
+ /* Do we do any clamping at exit? */
+ if (rack->rc_highly_buffered && rack_atexit_prtt_hbp) {
+ rack->r_ctl.rack_per_of_gp_ca = rack_atexit_prtt_hbp;
+ rack->r_ctl.rack_per_of_gp_ss = rack_atexit_prtt_hbp;
+ }
+ if ((rack->rc_highly_buffered == 0) && rack_atexit_prtt) {
+ rack->r_ctl.rack_per_of_gp_ca = rack_atexit_prtt;
+ rack->r_ctl.rack_per_of_gp_ss = rack_atexit_prtt;
+ }
+ /*
+ * Lets set rtt_diff to 0, so that we will get a "boost"
+ * after exiting.
+ */
+ rack->r_ctl.rc_rtt_diff = 0;
+
+ /* Clear all flags so we start fresh */
+ rack->rc_tp->t_bytes_acked = 0;
+ rack->rc_tp->ccv->flags &= ~CCF_ABC_SENTAWND;
+ /*
+ * If configured to, set the cwnd and ssthresh to
+ * our targets.
+ */
+ if (rack_probe_rtt_sets_cwnd) {
+ uint64_t ebdp;
+ uint32_t setto;
+
+ /* Set ssthresh so we get into CA once we hit our target */
+ if (rack_probertt_use_min_rtt_exit == 1) {
+ /* Set to min rtt */
+ rack_set_prtt_target(rack, segsiz,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt));
+ } else if (rack_probertt_use_min_rtt_exit == 2) {
+ /* Set to current gp rtt */
+ rack_set_prtt_target(rack, segsiz,
+ rack->r_ctl.rc_gp_srtt);
+ } else if (rack_probertt_use_min_rtt_exit == 3) {
+ /* Set to entry gp rtt */
+ rack_set_prtt_target(rack, segsiz,
+ rack->r_ctl.rc_entry_gp_rtt);
+ } else {
+ uint64_t sum;
+ uint32_t setval;
+
+ sum = rack->r_ctl.rc_entry_gp_rtt;
+ sum *= 10;
+ sum /= (uint64_t)(max(1, rack->r_ctl.rc_gp_srtt));
+ if (sum >= 20) {
+ /*
+ * A highly buffered path needs
+ * cwnd space for timely to work.
+ * Lets set things up as if
+ * we are heading back here again.
+ */
+ setval = rack->r_ctl.rc_entry_gp_rtt;
+ } else if (sum >= 15) {
+ /*
+ * Lets take the smaller of the
+ * two since we are just somewhat
+ * buffered.
+ */
+ setval = rack->r_ctl.rc_gp_srtt;
+ if (setval > rack->r_ctl.rc_entry_gp_rtt)
+ setval = rack->r_ctl.rc_entry_gp_rtt;
+ } else {
+ /*
+ * Here we are not highly buffered
+ * and should pick the min we can to
+ * keep from causing loss.
+ */
+ setval = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
+ }
+ rack_set_prtt_target(rack, segsiz,
+ setval);
+ }
+ if (rack_probe_rtt_sets_cwnd > 1) {
+ /* There is a percentage here to boost */
+ ebdp = rack->r_ctl.rc_target_probertt_flight;
+ ebdp *= rack_probe_rtt_sets_cwnd;
+ ebdp /= 100;
+ setto = rack->r_ctl.rc_target_probertt_flight + ebdp;
+ } else
+ setto = rack->r_ctl.rc_target_probertt_flight;
+ rack->rc_tp->snd_cwnd = roundup(setto, segsiz);
+ if (rack->rc_tp->snd_cwnd < (segsiz * rack_timely_min_segs)) {
+ /* Enforce a min */
+ rack->rc_tp->snd_cwnd = segsiz * rack_timely_min_segs;
+ }
+ /* If we set in the cwnd also set the ssthresh point so we are in CA */
+ rack->rc_tp->snd_ssthresh = (rack->rc_tp->snd_cwnd - 1);
+ }
+ rack_log_rtt_shrinks(rack, us_cts,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
+ __LINE__, RACK_RTTS_EXITPROBE);
+ /* Clear times last so log has all the info */
+ rack->r_ctl.rc_probertt_sndmax_atexit = rack->rc_tp->snd_max;
+ rack->r_ctl.rc_time_probertt_entered = us_cts;
+ rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
+ rack->r_ctl.rc_time_of_last_probertt = us_cts;
+}
+
+static void
+rack_check_probe_rtt(struct tcp_rack *rack, uint32_t us_cts)
+{
+ /* Check in on probe-rtt */
+ if (rack->rc_gp_filled == 0) {
+ /* We do not do p-rtt unless we have gp measurements */
+ return;
+ }
+ if (rack->in_probe_rtt) {
+ uint64_t no_overflow;
+ uint32_t endtime, must_stay;
+
+ if (rack->r_ctl.rc_went_idle_time &&
+ ((us_cts - rack->r_ctl.rc_went_idle_time) > rack_min_probertt_hold)) {
+ /*
+ * We went idle during prtt, just exit now.
+ */
+ rack_exit_probertt(rack, us_cts);
+ } else if (rack_probe_rtt_safety_val &&
+ TSTMP_GT(us_cts, rack->r_ctl.rc_time_probertt_entered) &&
+ ((us_cts - rack->r_ctl.rc_time_probertt_entered) > rack_probe_rtt_safety_val)) {
+ /*
+ * Probe RTT safety value triggered!
+ */
+ rack_log_rtt_shrinks(rack, us_cts,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
+ __LINE__, RACK_RTTS_SAFETY);
+ rack_exit_probertt(rack, us_cts);
+ }
+ /* Calculate the max we will wait */
+ endtime = rack->r_ctl.rc_time_probertt_entered + (rack->r_ctl.rc_gp_srtt * rack_max_drain_wait);
+ if (rack->rc_highly_buffered)
+ endtime += (rack->r_ctl.rc_gp_srtt * rack_max_drain_hbp);
+ /* Calculate the min we must wait */
+ must_stay = rack->r_ctl.rc_time_probertt_entered + (rack->r_ctl.rc_gp_srtt * rack_must_drain);
+ if ((ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) > rack->r_ctl.rc_target_probertt_flight) &&
+ TSTMP_LT(us_cts, endtime)) {
+ uint32_t calc;
+ /* Do we lower more? */
+no_exit:
+ if (TSTMP_GT(us_cts, rack->r_ctl.rc_time_probertt_entered))
+ calc = us_cts - rack->r_ctl.rc_time_probertt_entered;
+ else
+ calc = 0;
+ calc /= max(rack->r_ctl.rc_gp_srtt, 1);
+ if (calc) {
+ /* Maybe */
+ calc *= rack_per_of_gp_probertt_reduce;
+ rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt - calc;
+ /* Limit it too */
+ if (rack->r_ctl.rack_per_of_gp_probertt < rack_per_of_gp_lowthresh)
+ rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_lowthresh;
+ }
+ /* We must reach target or the time set */
+ return;
+ }
+ if (rack->r_ctl.rc_time_probertt_starts == 0) {
+ if ((TSTMP_LT(us_cts, must_stay) &&
+ rack->rc_highly_buffered) ||
+ (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) >
+ rack->r_ctl.rc_target_probertt_flight)) {
+ /* We are not past the must_stay time */
+ goto no_exit;
+ }
+ rack_log_rtt_shrinks(rack, us_cts,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
+ __LINE__, RACK_RTTS_REACHTARGET);
+ rack->r_ctl.rc_time_probertt_starts = us_cts;
+ if (rack->r_ctl.rc_time_probertt_starts == 0)
+ rack->r_ctl.rc_time_probertt_starts = 1;
+ /* Restore back to our rate we want to pace at in prtt */
+ rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
+ }
+ /*
+ * Setup our end time, some number of gp_srtts plus 200ms.
+ */
+ no_overflow = ((uint64_t)rack->r_ctl.rc_gp_srtt *
+ (uint64_t)rack_probertt_gpsrtt_cnt_mul);
+ if (rack_probertt_gpsrtt_cnt_div)
+ endtime = (uint32_t)(no_overflow / (uint64_t)rack_probertt_gpsrtt_cnt_div);
+ else
+ endtime = 0;
+ endtime += rack_min_probertt_hold;
+ endtime += rack->r_ctl.rc_time_probertt_starts;
+ if (TSTMP_GEQ(us_cts, endtime)) {
+ /* yes, exit probertt */
+ rack_exit_probertt(rack, us_cts);
+ }
+
+ } else if((us_cts - rack->r_ctl.rc_lower_rtt_us_cts) >= rack_time_between_probertt) {
+ /* Go into probertt, its been too long since we went lower */
+ rack_enter_probertt(rack, us_cts);
+ }
+}
+
+static void
+rack_update_multiplier(struct tcp_rack *rack, int32_t timely_says, uint64_t last_bw_est,
+ uint32_t rtt, int32_t rtt_diff)
+{
+ uint64_t cur_bw, up_bnd, low_bnd, subfr;
+ uint32_t losses;
+
+ if ((rack->rc_gp_dyn_mul == 0) ||
+ (rack->use_fixed_rate) ||
+ (rack->in_probe_rtt) ||
+ (rack->rc_always_pace == 0)) {
+ /* No dynamic GP multipler in play */
+ return;
+ }
+ losses = rack->r_ctl.rc_loss_count - rack->r_ctl.rc_loss_at_start;
+ cur_bw = rack_get_bw(rack);
+ /* Calculate our up and down range */
+ up_bnd = rack->r_ctl.last_gp_comp_bw * (uint64_t)rack_gp_per_bw_mul_up;
+ up_bnd /= 100;
+ up_bnd += rack->r_ctl.last_gp_comp_bw;
+
+ subfr = (uint64_t)rack->r_ctl.last_gp_comp_bw * (uint64_t)rack_gp_per_bw_mul_down;
+ subfr /= 100;
+ low_bnd = rack->r_ctl.last_gp_comp_bw - subfr;
+ if ((timely_says == 2) && (rack->r_ctl.rc_no_push_at_mrtt)) {
+ /*
+ * This is the case where our RTT is above
+ * the max target and we have been configured
+ * to just do timely no bonus up stuff in that case.
+ *
+ * There are two configurations, set to 1, and we
+ * just do timely if we are over our max. If its
+ * set above 1 then we slam the multipliers down
+ * to 100 and then decrement per timely.
+ */
+ rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
+ __LINE__, 3);
+ if (rack->r_ctl.rc_no_push_at_mrtt > 1)
+ rack_validate_multipliers_at_or_below_100(rack);
+ rack_decrease_bw_mul(rack, timely_says, rtt, rtt_diff);
+ } else if ((last_bw_est < low_bnd) && !losses) {
+ /*
+ * We are decreasing this is a bit complicated this
+ * means we are loosing ground. This could be
+ * because another flow entered and we are competing
+ * for b/w with it. This will push the RTT up which
+ * makes timely unusable unless we want to get shoved
+ * into a corner and just be backed off (the age
+ * old problem with delay based CC).
+ *
+ * On the other hand if it was a route change we
+ * would like to stay somewhat contained and not
+ * blow out the buffers.
+ */
+ rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
+ __LINE__, 3);
+ rack->r_ctl.last_gp_comp_bw = cur_bw;
+ if (rack->rc_gp_bwred == 0) {
+ /* Go into reduction counting */
+ rack->rc_gp_bwred = 1;
+ rack->rc_gp_timely_dec_cnt = 0;
+ }
+ if ((rack->rc_gp_timely_dec_cnt < rack_timely_max_push_drop) ||
+ (timely_says == 0)) {
+ /*
+ * Push another time with a faster pacing
+ * to try to gain back (we include override to
+ * get a full raise factor).
+ */
+ if ((rack->rc_gp_saw_ca && rack->r_ctl.rack_per_of_gp_ca <= rack_down_raise_thresh) ||
+ (rack->rc_gp_saw_ss && rack->r_ctl.rack_per_of_gp_ss <= rack_down_raise_thresh) ||
+ (timely_says == 0) ||
+ (rack_down_raise_thresh == 0)) {
+ /*
+ * Do an override up in b/w if we were
+ * below the threshold or if the threshold
+ * is zero we always do the raise.
+ */
+ rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 1);
+ } else {
+ /* Log it stays the same */
+ rack_log_timely(rack, 0, last_bw_est, low_bnd, 0,
+ __LINE__, 11);
+
+ }
+ rack->rc_gp_timely_dec_cnt++;
+ /* We are not incrementing really no-count */
+ rack->rc_gp_incr = 0;
+ rack->rc_gp_timely_inc_cnt = 0;
+ } else {
+ /*
+ * Lets just use the RTT
+ * information and give up
+ * pushing.
+ */
+ goto use_timely;
+ }
+ } else if ((timely_says != 2) &&
+ !losses &&
+ (last_bw_est > up_bnd)) {
+ /*
+ * We are increasing b/w lets keep going, updating
+ * our b/w and ignoring any timely input, unless
+ * of course we are at our max raise (if there is one).
+ */
+
+ rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
+ __LINE__, 3);
+ rack->r_ctl.last_gp_comp_bw = cur_bw;
+ if (rack->rc_gp_saw_ss &&
+ rack_per_upper_bound_ss &&
+ (rack->r_ctl.rack_per_of_gp_ss == rack_per_upper_bound_ss)) {
+ /*
+ * In cases where we can't go higher
+ * we should just use timely.
+ */
+ goto use_timely;
+ }
+ if (rack->rc_gp_saw_ca &&
+ rack_per_upper_bound_ca &&
+ (rack->r_ctl.rack_per_of_gp_ca == rack_per_upper_bound_ca)) {
+ /*
+ * In cases where we can't go higher
+ * we should just use timely.
+ */
+ goto use_timely;
+ }
+ rack->rc_gp_bwred = 0;
+ rack->rc_gp_timely_dec_cnt = 0;
+ /* You get a set number of pushes if timely is trying to reduce */
+ if ((rack->rc_gp_incr < rack_timely_max_push_rise) || (timely_says == 0)) {
+ rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
+ } else {
+ /* Log it stays the same */
+ rack_log_timely(rack, 0, last_bw_est, up_bnd, 0,
+ __LINE__, 12);
+
+ }
+ return;
+ } else {
+ /*
+ * We are staying between the lower and upper range bounds
+ * so use timely to decide.
+ */
+ rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
+ __LINE__, 3);
+use_timely:
+ if (timely_says) {
+ rack->rc_gp_incr = 0;
+ rack->rc_gp_timely_inc_cnt = 0;
+ if ((rack->rc_gp_timely_dec_cnt < rack_timely_max_push_drop) &&
+ !losses &&
+ (last_bw_est < low_bnd)) {
+ /* We are loosing ground */
+ rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
+ rack->rc_gp_timely_dec_cnt++;
+ /* We are not incrementing really no-count */
+ rack->rc_gp_incr = 0;
+ rack->rc_gp_timely_inc_cnt = 0;
+ } else
+ rack_decrease_bw_mul(rack, timely_says, rtt, rtt_diff);
+ } else {
+ rack->rc_gp_bwred = 0;
+ rack->rc_gp_timely_dec_cnt = 0;
+ rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
+ }
+ }
+}
+
+static int32_t
+rack_make_timely_judgement(struct tcp_rack *rack, uint32_t rtt, int32_t rtt_diff, uint32_t prev_rtt)
+{
+ int32_t timely_says;
+ uint64_t log_mult, log_rtt_a_diff;
+
+ log_rtt_a_diff = rtt;
+ log_rtt_a_diff <<= 32;
+ log_rtt_a_diff |= (uint32_t)rtt_diff;
+ if (rtt >= (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) *
+ rack_gp_rtt_maxmul)) {
+ /* Reduce the b/w multipler */
+ timely_says = 2;
+ log_mult = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_maxmul;
+ log_mult <<= 32;
+ log_mult |= prev_rtt;
+ rack_log_timely(rack, timely_says, log_mult,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
+ log_rtt_a_diff, __LINE__, 4);
+ } else if (rtt <= (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) +
+ ((get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_minmul) /
+ max(rack_gp_rtt_mindiv , 1)))) {
+ /* Increase the b/w multipler */
+ log_mult = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) +
+ ((get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_minmul) /
+ max(rack_gp_rtt_mindiv , 1));
+ log_mult <<= 32;
+ log_mult |= prev_rtt;
+ timely_says = 0;
+ rack_log_timely(rack, timely_says, log_mult ,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
+ log_rtt_a_diff, __LINE__, 5);
+ } else {
+ /*
+ * Use a gradient to find it the timely gradient
+ * is:
+ * grad = rc_rtt_diff / min_rtt;
+ *
+ * anything below or equal to 0 will be
+ * a increase indication. Anything above
+ * zero is a decrease. Note we take care
+ * of the actual gradient calculation
+ * in the reduction (its not needed for
+ * increase).
+ */
+ log_mult = prev_rtt;
+ if (rtt_diff <= 0) {
+ /*
+ * Rttdiff is less than zero, increase the
+ * b/w multipler (its 0 or negative)
+ */
+ timely_says = 0;
+ rack_log_timely(rack, timely_says, log_mult,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt), log_rtt_a_diff, __LINE__, 6);
+ } else {
+ /* Reduce the b/w multipler */
+ timely_says = 1;
+ rack_log_timely(rack, timely_says, log_mult,
+ get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt), log_rtt_a_diff, __LINE__, 7);
+ }
+ }
+ return (timely_says);
+}
+
+static void
+rack_do_goodput_measurement(struct tcpcb *tp, struct tcp_rack *rack,
+ tcp_seq th_ack, int line)
+{
+ uint64_t tim, bytes_ps, ltim, stim, utim;
+ uint32_t segsiz, bytes, reqbytes, us_cts;
+ int32_t gput, new_rtt_diff, timely_says;
+
+ us_cts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
+ segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
+ if (TSTMP_GEQ(us_cts, tp->gput_ts))
+ tim = us_cts - tp->gput_ts;
+ else
+ tim = 0;
+
+ if (TSTMP_GT(rack->r_ctl.rc_gp_cumack_ts, rack->r_ctl.rc_gp_output_ts))
+ stim = rack->r_ctl.rc_gp_cumack_ts - rack->r_ctl.rc_gp_output_ts;
+ else
+ stim = 0;
+ /*
+ * Use the larger of the send time or ack time. This prevents us
+ * from being influenced by ack artifacts to come up with too
+ * high of measurement. Note that since we are spanning over many more
+ * bytes in most of our measurements hopefully that is less likely to
+ * occur.
+ */
+ if (tim > stim)
+ utim = max(tim, 1);
+ else
+ utim = max(stim, 1);
+ /* Lets validate utim */
+ ltim = max(1, (utim/HPTS_USEC_IN_MSEC));
+ gput = (((uint64_t) (th_ack - tp->gput_seq)) << 3) / ltim;
+ reqbytes = min(rc_init_window(rack), (MIN_GP_WIN * segsiz));
+ if ((tim == 0) && (stim == 0)) {
+ /*
+ * Invalid measurement time, maybe
+ * all on one ack/one send?
+ */
+ bytes = 0;
+ bytes_ps = 0;
+ rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
+ 0, 0, 0, 10, __LINE__, NULL);
+ goto skip_measurement;
+ }
+ if (rack->r_ctl.rc_gp_lowrtt == 0xffffffff) {
+ /* We never made a us_rtt measurement? */
+ bytes = 0;
+ bytes_ps = 0;
+ rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
+ 0, 0, 0, 10, __LINE__, NULL);
+ goto skip_measurement;
+ }
+ /*
+ * Calculate the maximum possible b/w this connection
+ * could have. We base our calculation on the lowest
+ * rtt we have seen during the measurement and the
+ * largest rwnd the client has given us in that time. This
+ * forms a BDP that is the maximum that we could ever
+ * get to the client. Anything larger is not valid.
+ *
+ * I originally had code here that rejected measurements
+ * where the time was less than 1/2 the latest us_rtt.
+ * But after thinking on that I realized its wrong since
+ * say you had a 150Mbps or even 1Gbps link, and you
+ * were a long way away.. example I am in Europe (100ms rtt)
+ * talking to my 1Gbps link in S.C. Now measuring say 150,000
+ * bytes my time would be 1.2ms, and yet my rtt would say
+ * the measurement was invalid the time was < 50ms. The
+ * same thing is true for 150Mb (8ms of time).
+ *
+ * A better way I realized is to look at what the maximum
+ * the connection could possibly do. This is gated on
+ * the lowest RTT we have seen and the highest rwnd.
+ * We should in theory never exceed that, if we are
+ * then something on the path is storing up packets
+ * and then feeding them all at once to our endpoint
+ * messing up our measurement.
+ */
+ rack->r_ctl.last_max_bw = rack->r_ctl.rc_gp_high_rwnd;
+ rack->r_ctl.last_max_bw *= HPTS_USEC_IN_SEC;
+ rack->r_ctl.last_max_bw /= rack->r_ctl.rc_gp_lowrtt;
+ if (SEQ_LT(th_ack, tp->gput_seq)) {
+ /* No measurement can be made */
+ bytes = 0;
+ bytes_ps = 0;
+ rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
+ 0, 0, 0, 10, __LINE__, NULL);
+ goto skip_measurement;
+ } else
+ bytes = (th_ack - tp->gput_seq);
+ bytes_ps = (uint64_t)bytes;
+ /*
+ * Don't measure a b/w for pacing unless we have gotten at least
+ * an initial windows worth of data in this measurement interval.
+ *
+ * Small numbers of bytes get badly influenced by delayed ack and
+ * other artifacts. Note we take the initial window or our
+ * defined minimum GP (defaulting to 10 which hopefully is the
+ * IW).
+ */
+ if (rack->rc_gp_filled == 0) {
+ /*
+ * The initial estimate is special. We
+ * have blasted out an IW worth of packets
+ * without a real valid ack ts results. We
+ * then setup the app_limited_needs_set flag,
+ * this should get the first ack in (probably 2
+ * MSS worth) to be recorded as the timestamp.
+ * We thus allow a smaller number of bytes i.e.
+ * IW - 2MSS.
+ */
+ reqbytes -= (2 * segsiz);
+ /* Also lets fill previous for our first measurement to be neutral */
+ rack->r_ctl.rc_prev_gp_srtt = rack->r_ctl.rc_gp_srtt;
+ }
+ if ((bytes_ps < reqbytes) || rack->app_limited_needs_set) {
+ rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
+ rack->r_ctl.rc_app_limited_cnt,
+ 0, 0, 10, __LINE__, NULL);
+ goto skip_measurement;
+ }
+ /*
+ * We now need to calculate the Timely like status so
+ * we can update (possibly) the b/w multipliers.
+ */
+ new_rtt_diff = (int32_t)rack->r_ctl.rc_gp_srtt - (int32_t)rack->r_ctl.rc_prev_gp_srtt;
+ if (rack->rc_gp_filled == 0) {
+ /* No previous reading */
+ rack->r_ctl.rc_rtt_diff = new_rtt_diff;
+ } else {
+ if (rack->measure_saw_probe_rtt == 0) {
+ /*
+ * We don't want a probertt to be counted
+ * since it will be negative incorrectly. We
+ * expect to be reducing the RTT when we
+ * pace at a slower rate.
+ */
+ rack->r_ctl.rc_rtt_diff -= (rack->r_ctl.rc_rtt_diff / 8);
+ rack->r_ctl.rc_rtt_diff += (new_rtt_diff / 8);
+ }
+ }
+ timely_says = rack_make_timely_judgement(rack,
+ rack->r_ctl.rc_gp_srtt,
+ rack->r_ctl.rc_rtt_diff,
+ rack->r_ctl.rc_prev_gp_srtt
+ );
+ bytes_ps *= HPTS_USEC_IN_SEC;
+ bytes_ps /= utim;
+ if (bytes_ps > rack->r_ctl.last_max_bw) {
+ /*
+ * Something is on path playing
+ * since this b/w is not possible based
+ * on our BDP (highest rwnd and lowest rtt
+ * we saw in the measurement window).
+ *
+ * Another option here would be to
+ * instead skip the measurement.
+ */
+ rack_log_pacing_delay_calc(rack, bytes, reqbytes,
+ bytes_ps, rack->r_ctl.last_max_bw, 0,
+ 11, __LINE__, NULL);
+ bytes_ps = rack->r_ctl.last_max_bw;
+ }
+ /* We store gp for b/w in bytes per second */
+ if (rack->rc_gp_filled == 0) {
+ /* Initial measurment */
+ if (bytes_ps) {
+ rack->r_ctl.gp_bw = bytes_ps;
+ rack->rc_gp_filled = 1;
+ rack->r_ctl.num_avg = 1;
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+ } else {
+ rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
+ rack->r_ctl.rc_app_limited_cnt,
+ 0, 0, 10, __LINE__, NULL);
+ }
+ if (rack->rc_inp->inp_in_hpts &&
+ (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
+ /*
+ * Ok we can't trust the pacer in this case
+ * where we transition from un-paced to paced.
+ * Or for that matter when the burst mitigation
+ * was making a wild guess and got it wrong.
+ * Stop the pacer and clear up all the aggregate
+ * delays etc.
+ */
+ tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT);
+ rack->r_ctl.rc_hpts_flags = 0;
+ rack->r_ctl.rc_last_output_to = 0;
+ }
+ } else if (rack->r_ctl.num_avg < RACK_REQ_AVG) {
+ /* Still a small number run an average */
+ rack->r_ctl.gp_bw += bytes_ps;
+ rack->r_ctl.num_avg++;
+ if (rack->r_ctl.num_avg >= RACK_REQ_AVG) {
+ /* We have collected enought to move forward */
+ rack->r_ctl.gp_bw /= (uint64_t)rack->r_ctl.num_avg;
+ }
+ } else {
+ /*
+ * We want to take 1/wma of the goodput and add in to 7/8th
+ * of the old value weighted by the srtt. So if your measurement
+ * period is say 2 SRTT's long you would get 1/4 as the
+ * value, if it was like 1/2 SRTT then you would get 1/16th.
+ *
+ * But we must be careful not to take too much i.e. if the
+ * srtt is say 20ms and the measurement is taken over
+ * 400ms our weight would be 400/20 i.e. 20. On the
+ * other hand if we get a measurement over 1ms with a
+ * 10ms rtt we only want to take a much smaller portion.
+ */
+ uint64_t resid_bw, subpart, addpart, srtt;
+
+ srtt = ((uint64_t)TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT);
+ if (srtt == 0) {
+ /*
+ * Strange why did t_srtt go back to zero?
+ */
+ if (rack->r_ctl.rc_rack_min_rtt)
+ srtt = (rack->r_ctl.rc_rack_min_rtt * HPTS_USEC_IN_MSEC);
+ else
+ srtt = HPTS_USEC_IN_MSEC;
+ }
+ /*
+ * XXXrrs: Note for reviewers, in playing with
+ * dynamic pacing I discovered this GP calculation
+ * as done originally leads to some undesired results.
+ * Basically you can get longer measurements contributing
+ * too much to the WMA. Thus I changed it if you are doing
+ * dynamic adjustments to only do the aportioned adjustment
+ * if we have a very small (time wise) measurement. Longer
+ * measurements just get there weight (defaulting to 1/8)
+ * add to the WMA. We may want to think about changing
+ * this to always do that for both sides i.e. dynamic
+ * and non-dynamic... but considering lots of folks
+ * were playing with this I did not want to change the
+ * calculation per.se. without your thoughts.. Lawerence?
+ * Peter??
+ */
+ if (rack->rc_gp_dyn_mul == 0) {
+ subpart = rack->r_ctl.gp_bw * utim;
+ subpart /= (srtt * 8);
+ if (subpart < (rack->r_ctl.gp_bw / 2)) {
+ /*
+ * The b/w update takes no more
+ * away then 1/2 our running total
+ * so factor it in.
+ */
+ addpart = bytes_ps * utim;
+ addpart /= (srtt * 8);
+ } else {
+ /*
+ * Don't allow a single measurement
+ * to account for more than 1/2 of the
+ * WMA. This could happen on a retransmission
+ * where utim becomes huge compared to
+ * srtt (multiple retransmissions when using
+ * the sending rate which factors in all the
+ * transmissions from the first one).
+ */
+ subpart = rack->r_ctl.gp_bw / 2;
+ addpart = bytes_ps / 2;
+ }
+ resid_bw = rack->r_ctl.gp_bw - subpart;
+ rack->r_ctl.gp_bw = resid_bw + addpart;
+ } else {
+ if ((utim / srtt) <= 1) {
+ /*
+ * The b/w update was over a small period
+ * of time. The idea here is to prevent a small
+ * measurement time period from counting
+ * too much. So we scale it based on the
+ * time so it attributes less than 1/rack_wma_divisor
+ * of its measurement.
+ */
+ subpart = rack->r_ctl.gp_bw * utim;
+ subpart /= (srtt * rack_wma_divisor);
+ addpart = bytes_ps * utim;
+ addpart /= (srtt * rack_wma_divisor);
+ } else {
+ /*
+ * The scaled measurement was long
+ * enough so lets just add in the
+ * portion of the measurment i.e. 1/rack_wma_divisor
+ */
+ subpart = rack->r_ctl.gp_bw / rack_wma_divisor;
+ addpart = bytes_ps / rack_wma_divisor;
+ }
+ if ((rack->measure_saw_probe_rtt == 0) ||
+ (bytes_ps > rack->r_ctl.gp_bw)) {
+ /*
+ * For probe-rtt we only add it in
+ * if its larger, all others we just
+ * add in.
+ */
+ resid_bw = rack->r_ctl.gp_bw - subpart;
+ rack->r_ctl.gp_bw = resid_bw + addpart;
+ }
+ }
+ }
+ /* We do not update any multipliers if we are in or have seen a probe-rtt */
+ if ((rack->measure_saw_probe_rtt == 0) && rack->rc_gp_rtt_set)
+ rack_update_multiplier(rack, timely_says, bytes_ps,
+ rack->r_ctl.rc_gp_srtt,
+ rack->r_ctl.rc_rtt_diff);
+ rack_log_pacing_delay_calc(rack, bytes, tim, bytes_ps, stim,
+ rack_get_bw(rack), 3, line, NULL);
+ /* reset the gp srtt and setup the new prev */
+ rack->r_ctl.rc_prev_gp_srtt = rack->r_ctl.rc_gp_srtt;
+ /* Record the lost count for the next measurement */
+ rack->r_ctl.rc_loss_at_start = rack->r_ctl.rc_loss_count;
+ /*
+ * We restart our diffs based on the gpsrtt in the
+ * measurement window.
+ */
+ rack->rc_gp_rtt_set = 0;
+ rack->rc_gp_saw_rec = 0;
+ rack->rc_gp_saw_ca = 0;
+ rack->rc_gp_saw_ss = 0;
+ rack->rc_dragged_bottom = 0;
+skip_measurement:
+
+#ifdef STATS
+ stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT,
+ gput);
+ /*
+ * XXXLAS: This is a temporary hack, and should be
+ * chained off VOI_TCP_GPUT when stats(9) grows an
+ * API to deal with chained VOIs.
+ */
+ 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);
+#endif
+ tp->t_flags &= ~TF_GPUTINPROG;
+ tp->t_stats_gput_prev = gput;
+ /*
+ * Now are we app limited now and there is space from where we
+ * were to where we want to go?
+ *
+ * We don't do the other case i.e. non-applimited here since
+ * the next send will trigger us picking up the missing data.
+ */
+ if (rack->r_ctl.rc_first_appl &&
+ rack->r_ctl.rc_app_limited_cnt &&
+ (SEQ_GT(rack->r_ctl.rc_first_appl->r_start, th_ack)) &&
+ ((rack->r_ctl.rc_first_appl->r_start - th_ack) >
+ max(rc_init_window(rack), (MIN_GP_WIN * segsiz)))) {
+ /*
+ * Yep there is enough outstanding to make a measurement here.
+ */
+ struct rack_sendmap *rsm, fe;
+
+ tp->t_flags |= TF_GPUTINPROG;
+ rack->r_ctl.rc_gp_lowrtt = 0xffffffff;
+ rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
+ tp->gput_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
+ rack->app_limited_needs_set = 0;
+ tp->gput_seq = th_ack;
+ if (rack->in_probe_rtt)
+ rack->measure_saw_probe_rtt = 1;
+ else if ((rack->measure_saw_probe_rtt) &&
+ (SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
+ rack->measure_saw_probe_rtt = 0;
+ if ((rack->r_ctl.rc_first_appl->r_start - th_ack) >= rack_get_measure_window(tp, rack)) {
+ /* There is a full window to gain info from */
+ tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
+ } else {
+ /* We can only measure up to the applimited point */
+ tp->gput_ack = tp->gput_seq + (rack->r_ctl.rc_first_appl->r_start - th_ack);
+ }
+ /*
+ * Now we need to find the timestamp of the send at tp->gput_seq
+ * for the send based measurement.
+ */
+ fe.r_start = tp->gput_seq;
+ rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
+ if (rsm) {
+ /* Ok send-based limit is set */
+ if (SEQ_LT(rsm->r_start, tp->gput_seq)) {
+ /*
+ * Move back to include the earlier part
+ * so our ack time lines up right (this may
+ * make an overlapping measurement but thats
+ * ok).
+ */
+ tp->gput_seq = rsm->r_start;
+ }
+ if (rsm->r_flags & RACK_ACKED)
+ tp->gput_ts = rsm->r_ack_arrival;
+ else
+ rack->app_limited_needs_set = 1;
+ rack->r_ctl.rc_gp_output_ts = rsm->usec_orig_send;
+ } else {
+ /*
+ * If we don't find the rsm due to some
+ * send-limit set the current time, which
+ * basically disables the send-limit.
+ */
+ rack->r_ctl.rc_gp_output_ts = tcp_get_usecs(NULL);
+ }
+ rack_log_pacing_delay_calc(rack,
+ tp->gput_seq,
+ tp->gput_ack,
+ (uint64_t)rsm,
+ tp->gput_ts,
+ rack->r_ctl.rc_app_limited_cnt,
+ 9,
+ __LINE__, NULL);
+ }
+}
+
/*
* CC wrapper hook functions
*/
@@ -1632,10 +3947,6 @@
rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, struct tcphdr *th, uint16_t nsegs,
uint16_t type, int32_t recovery)
{
-#ifdef STATS
- int32_t gput;
-#endif
-
INP_WLOCK_ASSERT(tp->t_inpcb);
tp->ccv->nsegs = nsegs;
tp->ccv->bytes_this_ack = BYTES_THIS_ACK(tp, th);
@@ -1647,63 +3958,41 @@
tp->ccv->bytes_this_ack = max;
}
}
- if ((!V_tcp_do_newcwv && (tp->snd_cwnd <= tp->snd_wnd)) ||
- (V_tcp_do_newcwv && (tp->snd_cwnd <= tp->snd_wnd) &&
- (tp->snd_cwnd < (ctf_flight_size(tp, rack->r_ctl.rc_sacked) * 2))))
+ if (rack->r_ctl.cwnd_to_use <= tp->snd_wnd)
tp->ccv->flags |= CCF_CWND_LIMITED;
else
tp->ccv->flags &= ~CCF_CWND_LIMITED;
-
- if (type == CC_ACK) {
#ifdef STATS
- stats_voi_update_abs_s32(tp->t_stats, VOI_TCP_CALCFRWINDIFF,
- ((int32_t) tp->snd_cwnd) - tp->snd_wnd);
- if ((tp->t_flags & TF_GPUTINPROG) &&
- 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);
+ stats_voi_update_abs_s32(tp->t_stats, VOI_TCP_CALCFRWINDIFF,
+ ((int32_t)rack->r_ctl.cwnd_to_use) - tp->snd_wnd);
+#endif
+ if ((tp->t_flags & TF_GPUTINPROG) &&
+ rack_enough_for_measurement(tp, rack, th->th_ack)) {
+ /* Measure the Goodput */
+ rack_do_goodput_measurement(tp, rack, th->th_ack, __LINE__);
+#ifdef NETFLIX_PEAKRATE
+ if ((type == CC_ACK) &&
+ (tp->t_maxpeakrate)) {
/*
- * XXXLAS: This is a temporary hack, and should be
- * chained off VOI_TCP_GPUT when stats(9) grows an
- * API to deal with chained VOIs.
+ * We update t_peakrate_thr. This gives us roughly
+ * one update per round trip time. Note
+ * it will only be used if pace_always is off i.e
+ * we don't do this for paced flows.
*/
- 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 = gput;
-#ifdef NETFLIX_PEAKRATE
- if (tp->t_maxpeakrate) {
- /*
- * We update t_peakrate_thr. This gives us roughly
- * one update per round trip time.
- */
- tcp_update_peakrate_thr(tp);
- }
-#endif
+ tcp_update_peakrate_thr(tp);
}
#endif
- if (tp->snd_cwnd > tp->snd_ssthresh) {
- tp->t_bytes_acked += min(tp->ccv->bytes_this_ack,
- 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;
- }
- } else {
- tp->ccv->flags &= ~CCF_ABC_SENTAWND;
- tp->t_bytes_acked = 0;
+ }
+ if (rack->r_ctl.cwnd_to_use > tp->snd_ssthresh) {
+ tp->t_bytes_acked += min(tp->ccv->bytes_this_ack,
+ nsegs * V_tcp_abc_l_var * ctf_fixed_maxseg(tp));
+ if (tp->t_bytes_acked >= rack->r_ctl.cwnd_to_use) {
+ tp->t_bytes_acked -= rack->r_ctl.cwnd_to_use;
+ tp->ccv->flags |= CCF_ABC_SENTAWND;
}
+ } else {
+ tp->ccv->flags &= ~CCF_ABC_SENTAWND;
+ tp->t_bytes_acked = 0;
}
if (CC_ALGO(tp)->ack_received != NULL) {
/* XXXLAS: Find a way to live without this */
@@ -1711,15 +4000,19 @@
CC_ALGO(tp)->ack_received(tp->ccv, type);
}
#ifdef STATS
- stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_LCWIN, tp->snd_cwnd);
+ stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_LCWIN, rack->r_ctl.cwnd_to_use);
#endif
- if (rack->r_ctl.rc_rack_largest_cwnd < tp->snd_cwnd) {
- rack->r_ctl.rc_rack_largest_cwnd = tp->snd_cwnd;
+ if (rack->r_ctl.rc_rack_largest_cwnd < rack->r_ctl.cwnd_to_use) {
+ rack->r_ctl.rc_rack_largest_cwnd = rack->r_ctl.cwnd_to_use;
}
- /* we enforce max peak rate if it is set. */
- if (tp->t_peakrate_thr && tp->snd_cwnd > tp->t_peakrate_thr) {
+#ifdef NETFLIX_PEAKRATE
+ /* we enforce max peak rate if it is set and we are not pacing */
+ if ((rack->rc_always_pace == 0) &&
+ tp->t_peakrate_thr &&
+ (tp->snd_cwnd > tp->t_peakrate_thr)) {
tp->snd_cwnd = tp->t_peakrate_thr;
}
+#endif
}
static void
@@ -1729,8 +4022,16 @@
rack = (struct tcp_rack *)tp->t_fb_ptr;
INP_WLOCK_ASSERT(tp->t_inpcb);
- if (rack->r_ctl.rc_prr_sndcnt > 0)
- rack->r_wanted_output++;
+ /*
+ * If we are doing PRR and have enough
+ * room to send <or> we are pacing and prr
+ * is disabled we will want to see if we
+ * can send data (by setting r_wanted_output to
+ * true).
+ */
+ if ((rack->r_ctl.rc_prr_sndcnt > 0) ||
+ rack->rack_no_prr)
+ rack->r_wanted_output = 1;
}
static void
@@ -1737,42 +4038,33 @@
rack_post_recovery(struct tcpcb *tp, struct tcphdr *th)
{
struct tcp_rack *rack;
+ uint32_t orig_cwnd;
+
+ orig_cwnd = tp->snd_cwnd;
INP_WLOCK_ASSERT(tp->t_inpcb);
rack = (struct tcp_rack *)tp->t_fb_ptr;
- if (CC_ALGO(tp)->post_recovery != NULL) {
- tp->ccv->curack = th->th_ack;
- CC_ALGO(tp)->post_recovery(tp->ccv);
- }
- /*
- * Here we can in theory adjust cwnd to be based on the number of
- * losses in the window (rack->r_ctl.rc_loss_count). This is done
- * based on the rack_use_proportional flag.
- */
- if (rack->r_ctl.rc_prop_reduce && rack->r_ctl.rc_prop_rate) {
- int32_t reduce;
-
- reduce = (rack->r_ctl.rc_loss_count * rack->r_ctl.rc_prop_rate);
- if (reduce > 50) {
- reduce = 50;
+ if (rack->rc_not_backing_off == 0) {
+ /* only alert CC if we alerted when we entered */
+ if (CC_ALGO(tp)->post_recovery != NULL) {
+ tp->ccv->curack = th->th_ack;
+ CC_ALGO(tp)->post_recovery(tp->ccv);
}
- tp->snd_cwnd -= ((reduce * tp->snd_cwnd) / 100);
- } else {
if (tp->snd_cwnd > tp->snd_ssthresh) {
/* Drop us down to the ssthresh (1/2 cwnd at loss) */
tp->snd_cwnd = tp->snd_ssthresh;
}
}
- if (rack->r_ctl.rc_prr_sndcnt > 0) {
+ if ((rack->rack_no_prr == 0) &&
+ (rack->r_ctl.rc_prr_sndcnt > 0)) {
/* 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);
+ rack_log_to_prr(rack, 1, 0);
}
+ rack_log_to_prr(rack, 14, orig_cwnd);
tp->snd_recover = tp->snd_una;
EXIT_RECOVERY(tp->t_flags);
-
-
}
static void
@@ -1788,12 +4080,12 @@
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 = ctf_fixed_maxseg(tp);
- rack_log_to_prr(rack, 2);
+ if (rack->rack_no_prr == 0) {
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 2, 0);
+ }
rack->r_ctl.rc_prr_recovery_fs = tp->snd_max - tp->snd_una;
tp->snd_recover = tp->snd_max;
if (tp->t_flags2 & TF2_ECN_PERMIT)
@@ -1812,7 +4104,7 @@
tp->t_dupacks = 0;
tp->t_bytes_acked = 0;
EXIT_RECOVERY(tp->t_flags);
- tp->snd_ssthresh = max(2, min(tp->snd_wnd, tp->snd_cwnd) / 2 /
+ tp->snd_ssthresh = max(2, min(tp->snd_wnd, rack->r_ctl.cwnd_to_use) / 2 /
ctf_fixed_maxseg(tp)) * ctf_fixed_maxseg(tp);
tp->snd_cwnd = ctf_fixed_maxseg(tp);
if (tp->t_flags2 & TF2_ECN_PERMIT)
@@ -1836,7 +4128,41 @@
tp->t_badrxtwin = 0;
break;
}
+ /*
+ * If we are below our max rtt, don't
+ * signal the CC control to change things.
+ * instead set it up so that we are in
+ * recovery but not going to back off.
+ */
+ if (rack->rc_highly_buffered) {
+ /*
+ * Do we use the higher rtt for
+ * our threshold to not backoff (like CDG)?
+ */
+ uint32_t rtt_mul, rtt_div;
+
+ if (rack_use_max_for_nobackoff) {
+ rtt_mul = (rack_gp_rtt_maxmul - 1);
+ rtt_div = 1;
+ } else {
+ rtt_mul = rack_gp_rtt_minmul;
+ rtt_div = max(rack_gp_rtt_mindiv , 1);
+ }
+ if (rack->r_ctl.rc_gp_srtt <= (rack->r_ctl.rc_lowest_us_rtt +
+ ((rack->r_ctl.rc_lowest_us_rtt * rtt_mul) /
+ rtt_div))) {
+ /* below our min threshold */
+ rack->rc_not_backing_off = 1;
+ ENTER_RECOVERY(rack->rc_tp->t_flags);
+ rack_log_rtt_shrinks(rack, 0,
+ rtt_mul,
+ rtt_div,
+ RACK_RTTS_NOBACKOFF);
+ return;
+ }
+ }
+ rack->rc_not_backing_off = 0;
if (CC_ALGO(tp)->cong_signal != NULL) {
if (th != NULL)
tp->ccv->curack = th->th_ack;
@@ -1847,7 +4173,7 @@
static inline void
-rack_cc_after_idle(struct tcpcb *tp)
+rack_cc_after_idle(struct tcp_rack *rack, struct tcpcb *tp)
{
uint32_t i_cwnd;
@@ -1864,7 +4190,7 @@
if (tp->snd_cwnd == 1)
i_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */
else
- i_cwnd = tcp_compute_initwnd(tcp_maxseg(tp));
+ i_cwnd = rc_init_window(rack);
/*
* Being idle is no differnt than the initial window. If the cc
@@ -2014,7 +4340,7 @@
{
struct rack_sendmap *prsm;
uint32_t thresh, len;
- int maxseg;
+ int segsiz;
if (srtt == 0)
srtt = 1;
@@ -2024,12 +4350,12 @@
thresh = (srtt * 2);
/* Get the previous sent packet, if any */
- maxseg = ctf_fixed_maxseg(tp);
+ segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
counter_u64_add(rack_enter_tlp_calc, 1);
len = rsm->r_end - rsm->r_start;
if (rack->rack_tlp_threshold_use == TLP_USE_ID) {
/* Exactly like the ID */
- if (((tp->snd_max - tp->snd_una) - rack->r_ctl.rc_sacked + rack->r_ctl.rc_holes_rxt) <= maxseg) {
+ if (((tp->snd_max - tp->snd_una) - rack->r_ctl.rc_sacked + rack->r_ctl.rc_holes_rxt) <= segsiz) {
uint32_t alt_thresh;
/*
* Compensate for delayed-ack with the d-ack time.
@@ -2042,7 +4368,7 @@
} else if (rack->rack_tlp_threshold_use == TLP_USE_TWO_ONE) {
/* 2.1 behavior */
prsm = TAILQ_PREV(rsm, rack_head, r_tnext);
- if (prsm && (len <= maxseg)) {
+ if (prsm && (len <= segsiz)) {
/*
* Two packets outstanding, thresh should be (2*srtt) +
* possible inter-packet delay (if any).
@@ -2058,7 +4384,7 @@
inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx];
}
thresh += inter_gap;
- } else if (len <= maxseg) {
+ } else if (len <= segsiz) {
/*
* Possibly compensate for delayed-ack.
*/
@@ -2071,7 +4397,7 @@
}
} else if (rack->rack_tlp_threshold_use == TLP_USE_TWO_TWO) {
/* 2.2 behavior */
- if (len <= maxseg) {
+ if (len <= segsiz) {
uint32_t alt_thresh;
/*
* Compensate for delayed-ack with the d-ack time.
@@ -2144,16 +4470,22 @@
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]) {
+ if (TSTMP_LT(tsused, rsm->r_tim_lastsent[idx])) {
return (NULL);
}
if ((tsused - rsm->r_tim_lastsent[idx]) < thresh) {
return (NULL);
}
- /* Ok if we reach here we are over-due */
- rack->r_ctl.rc_rsm_start = rsm->r_start;
- rack->r_ctl.rc_cwnd_at = tp->snd_cwnd;
- rack->r_ctl.rc_ssthresh_at = tp->snd_ssthresh;
+ /* Ok if we reach here we are over-due and this guy can be sent */
+ if (IN_RECOVERY(tp->t_flags) == 0) {
+ /*
+ * For the one that enters us into recovery record undo
+ * info.
+ */
+ rack->r_ctl.rc_rsm_start = rsm->r_start;
+ rack->r_ctl.rc_cwnd_at = tp->snd_cwnd;
+ rack->r_ctl.rc_ssthresh_at = tp->snd_ssthresh;
+ }
rack_cong_signal(tp, NULL, CC_NDUPACK);
return (rsm);
}
@@ -2198,6 +4530,7 @@
/* We can't start any timer in persists */
return (rack_get_persists_timer_val(tp, rack));
}
+ rack->rc_on_min_to = 0;
if ((tp->t_state < TCPS_ESTABLISHED) ||
((tp->t_flags & TF_SACK_PERMIT) == 0))
goto activate_rxt;
@@ -2213,7 +4546,7 @@
tstmp_touse = rsm->r_tim_lastsent[idx];
else
tstmp_touse = rack->r_ctl.rc_tlp_rxt_last_time;
- if (TSTMP_GT(tstmp_touse, cts))
+ if (TSTMP_GT(cts, tstmp_touse))
time_since_sent = cts - tstmp_touse;
}
if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) {
@@ -2257,8 +4590,9 @@
*/
goto activate_rxt;
}
- if ((rack->use_rack_cheat == 0) &&
+ if ((rack->use_rack_rr == 0) &&
(IN_RECOVERY(tp->t_flags)) &&
+ (rack->rack_no_prr == 0) &&
(rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) {
/*
* We are not cheating, in recovery and
@@ -2278,18 +4612,22 @@
to = exp - cts;
if (to < rack->r_ctl.rc_min_to) {
to = rack->r_ctl.rc_min_to;
+ if (rack->r_rr_config == 3)
+ rack->rc_on_min_to = 1;
}
} else {
to = rack->r_ctl.rc_min_to;
+ if (rack->r_rr_config == 3)
+ rack->rc_on_min_to = 1;
}
} 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)) {
+ if ((rack->rc_tlp_in_progress != 0) &&
+ (rack->r_ctl.rc_tlp_cnt_out >= rack_tlp_limit)) {
/*
- * The previous send was a TLP or a tlp_rtx is in
- * process.
+ * The previous send was a TLP and we have sent
+ * N TLP's without sending new data.
*/
goto activate_rxt;
}
@@ -2309,7 +4647,7 @@
tstmp_touse = rsm->r_tim_lastsent[idx];
else
tstmp_touse = rack->r_ctl.rc_tlp_rxt_last_time;
- if (TSTMP_GT(tstmp_touse, cts))
+ if (TSTMP_GT(cts, tstmp_touse))
time_since_sent = cts - tstmp_touse;
is_tlp_timer = 1;
if (tp->t_srtt) {
@@ -2317,11 +4655,27 @@
srtt = TICKS_2_MSEC(srtt_cur);
} else
srtt = RACK_INITIAL_RTO;
+ /*
+ * If the SRTT is not keeping up and the
+ * rack RTT has spiked we want to use
+ * the last RTT not the smoothed one.
+ */
+ if (rack_tlp_use_greater && (srtt < rack_grab_rtt(tp, rack)))
+ srtt = rack_grab_rtt(tp, rack);
thresh = rack_calc_thresh_tlp(tp, rack, rsm, srtt);
if (thresh > time_since_sent)
to = thresh - time_since_sent;
- else
+ else {
to = rack->r_ctl.rc_min_to;
+ rack_log_alt_to_to_cancel(rack,
+ thresh, /* flex1 */
+ time_since_sent, /* flex2 */
+ tstmp_touse, /* flex3 */
+ rack->r_ctl.rc_tlp_rxt_last_time, /* flex4 */
+ rsm->r_tim_lastsent[idx],
+ srtt,
+ idx, 99);
+ }
if (to > TCPTV_REXMTMAX) {
/*
* If the TLP time works out to larger than the max
@@ -2329,28 +4683,11 @@
*/
goto activate_rxt;
}
- if (rsm->r_start != rack->r_ctl.rc_last_tlp_seq) {
- /*
- * The tail is no longer the last one I did a probe
- * on
- */
- rack->r_ctl.rc_tlp_seg_send_cnt = 0;
- rack->r_ctl.rc_last_tlp_seq = rsm->r_start;
- }
}
if (is_tlp_timer == 0) {
rack->r_ctl.rc_hpts_flags |= PACE_TMR_RACK;
} else {
- if ((rack->r_ctl.rc_tlp_send_cnt > rack_tlp_max_resend) ||
- (rack->r_ctl.rc_tlp_seg_send_cnt > rack_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 {
- rack->r_ctl.rc_hpts_flags |= PACE_TMR_TLP;
- }
+ rack->r_ctl.rc_hpts_flags |= PACE_TMR_TLP;
}
if (to == 0)
to = 1;
@@ -2361,7 +4698,22 @@
rack_enter_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
if (rack->rc_in_persist == 0) {
- rack->r_ctl.rc_went_idle_time = cts;
+ if (tp->t_flags & TF_GPUTINPROG) {
+ /*
+ * Stop the goodput now, the calling of the
+ * measurement function clears the flag.
+ */
+ rack_do_goodput_measurement(tp, rack, tp->snd_una, __LINE__);
+ }
+#ifdef NETFLIX_SHARED_CWND
+ if (rack->r_ctl.rc_scw) {
+ tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
+ rack->rack_scwnd_is_idle = 1;
+ }
+#endif
+ rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
+ if (rack->r_ctl.rc_went_idle_time == 0)
+ rack->r_ctl.rc_went_idle_time = 1;
rack_timer_cancel(tp, rack, cts, __LINE__);
tp->t_rxtshift = 0;
rack->rc_in_persist = 1;
@@ -2369,63 +4721,184 @@
}
static void
-rack_exit_persist(struct tcpcb *tp, struct tcp_rack *rack)
+rack_exit_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
{
if (rack->rc_inp->inp_in_hpts) {
tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT);
rack->r_ctl.rc_hpts_flags = 0;
}
+#ifdef NETFLIX_SHARED_CWND
+ if (rack->r_ctl.rc_scw) {
+ tcp_shared_cwnd_active(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
+ rack->rack_scwnd_is_idle = 0;
+ }
+#endif
+ if (rack->rc_gp_dyn_mul &&
+ (rack->use_fixed_rate == 0) &&
+ (rack->rc_always_pace)) {
+ /*
+ * Do we count this as if a probe-rtt just
+ * finished?
+ */
+ uint32_t time_idle, idle_min;
+
+ time_idle = tcp_get_usecs(NULL) - rack->r_ctl.rc_went_idle_time;
+ idle_min = rack_min_probertt_hold;
+ if (rack_probertt_gpsrtt_cnt_div) {
+ uint64_t extra;
+ extra = (uint64_t)rack->r_ctl.rc_gp_srtt *
+ (uint64_t)rack_probertt_gpsrtt_cnt_mul;
+ extra /= (uint64_t)rack_probertt_gpsrtt_cnt_div;
+ idle_min += (uint32_t)extra;
+ }
+ if (time_idle >= idle_min) {
+ /* Yes, we count it as a probe-rtt. */
+ uint32_t us_cts;
+
+ us_cts = tcp_get_usecs(NULL);
+ if (rack->in_probe_rtt == 0) {
+ rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
+ rack->r_ctl.rc_time_probertt_entered = rack->r_ctl.rc_lower_rtt_us_cts;
+ rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts;
+ rack->r_ctl.rc_time_of_last_probertt = rack->r_ctl.rc_lower_rtt_us_cts;
+ } else {
+ rack_exit_probertt(rack, us_cts);
+ }
+ }
+
+ }
rack->rc_in_persist = 0;
rack->r_ctl.rc_went_idle_time = 0;
- tp->t_flags &= ~TF_FORCEDATA;
tp->t_rxtshift = 0;
+ rack->r_ctl.rc_agg_delayed = 0;
+ rack->r_early = 0;
+ rack->r_late = 0;
+ rack->r_ctl.rc_agg_early = 0;
}
static void
+rack_log_hpts_diag(struct tcp_rack *rack, uint32_t cts,
+ struct hpts_diag *diag, struct timeval *tv)
+{
+ if (rack_verbose_logging && rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
+ union tcp_log_stackspecific log;
+
+ memset(&log.u_bbr, 0, sizeof(log.u_bbr));
+ 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.timeStamp = 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(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ BBR_LOG_HPTSDIAG, 0,
+ 0, &log, false, tv);
+ }
+
+}
+
+static void
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 hpts_diag diag;
struct inpcb *inp;
+ struct timeval tv;
uint32_t delayed_ack = 0;
uint32_t hpts_timeout;
uint8_t stopped;
uint32_t left = 0;
+ uint32_t us_cts;
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;
}
+ if (inp->inp_in_hpts) {
+ /* Already on the pacer */
+ return;
+ }
stopped = rack->rc_tmr_stopped;
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;
+ rack->r_ctl.rc_hpts_flags = 0;
+ us_cts = tcp_get_usecs(&tv);
+ /* Now early/late accounting */
+ if (rack->r_early) {
+ /*
+ * We have a early carry over set,
+ * we can always add more time so we
+ * can always make this compensation.
+ */
+ slot += rack->r_ctl.rc_agg_early;
+ rack->r_early = 0;
+ rack->r_ctl.rc_agg_early = 0;
}
- if (slot) {
- /* We are hptsi too */
- rack->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT;
- } else if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
+ if (rack->r_late) {
/*
- * We are still left on the hpts when the to goes
- * it will be for output.
+ * This is harder, we can
+ * compensate some but it
+ * really depends on what
+ * the current pacing time is.
*/
- if (TSTMP_GT(rack->r_ctl.rc_last_output_to, cts))
- slot = rack->r_ctl.rc_last_output_to - cts;
- else
- slot = 1;
+ if (rack->r_ctl.rc_agg_delayed >= slot) {
+ /*
+ * We can't compensate for it all.
+ * And we have to have some time
+ * on the clock. We always have a min
+ * 10 slots (10 x 10 i.e. 100 usecs).
+ */
+ if (slot <= HPTS_TICKS_PER_USEC) {
+ /* We gain delay */
+ rack->r_ctl.rc_agg_delayed += (HPTS_TICKS_PER_USEC - slot);
+ slot = HPTS_TICKS_PER_USEC;
+ } else {
+ /* We take off some */
+ rack->r_ctl.rc_agg_delayed -= (slot - HPTS_TICKS_PER_USEC);
+ slot = HPTS_TICKS_PER_USEC;
+ }
+ } else {
+
+ slot -= rack->r_ctl.rc_agg_delayed;
+ rack->r_ctl.rc_agg_delayed = 0;
+ /* Make sure we have 100 useconds at minimum */
+ if (slot < HPTS_TICKS_PER_USEC) {
+ rack->r_ctl.rc_agg_delayed = HPTS_TICKS_PER_USEC - slot;
+ slot = HPTS_TICKS_PER_USEC;
+ }
+ if (rack->r_ctl.rc_agg_delayed == 0)
+ rack->r_late = 0;
+ }
}
+ if (slot) {
+ /* We are pacing too */
+ rack->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT;
+ }
hpts_timeout = rack_timer_start(tp, rack, cts, sup_rack);
#ifdef NETFLIX_EXP_DETECTION
if (rack->sack_attack_disable &&
- (slot < USEC_TO_MSEC(tcp_sad_pacing_interval))) {
+ (slot < tcp_sad_pacing_interval)) {
/*
* We have a potential attacker on
* the line. We have possibly some
@@ -2436,7 +4909,7 @@
* interval is longer). Its stored in
* micro-seconds, so lets convert to msecs.
*/
- slot = USEC_TO_MSEC(tcp_sad_pacing_interval);
+ slot = tcp_sad_pacing_interval;
}
#endif
if (tp->t_flags & TF_DELACK) {
@@ -2469,6 +4942,16 @@
hpts_timeout = TP_KEEPINIT(tp);
}
rack->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP;
+ if (rack->in_probe_rtt) {
+ /*
+ * We want to instead not wake up a long time from
+ * now but to wake up about the time we would
+ * exit probe-rtt and initiate a keep-alive ack.
+ * This will get us out of probe-rtt and update
+ * our min-rtt.
+ */
+ hpts_timeout = (rack_min_probertt_hold / HPTS_USEC_IN_MSEC);
+ }
}
}
if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) ==
@@ -2494,38 +4977,70 @@
hpts_timeout = 0x7ffffffe;
rack->r_ctl.rc_timer_exp = cts + hpts_timeout;
}
+ if ((rack->rc_gp_filled == 0) &&
+ (hpts_timeout < slot) &&
+ (rack->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) {
+ /*
+ * We have no good estimate yet for the
+ * old clunky burst mitigation or the
+ * real pacing. And the tlp or rxt is smaller
+ * than the pacing calculation. Lets not
+ * pace that long since we know the calculation
+ * so far is not accurate.
+ */
+ slot = hpts_timeout;
+ }
+ rack->r_ctl.last_pacing_time = slot;
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)
- tcp_hpts_insert(tp->t_inpcb, HPTS_MS_TO_SLOTS(slot));
- rack_log_to_start(rack, cts, hpts_timeout, slot, 1);
- } else {
+ rack->r_ctl.rc_last_output_to = us_cts + slot;
+ if (rack->rc_always_pace || rack->r_mbuf_queue) {
+ if ((rack->rc_gp_filled == 0) ||
+ rack->pacing_longer_than_rtt) {
+ inp->inp_flags2 &= ~(INP_DONT_SACK_QUEUE|INP_MBUF_QUEUE_READY);
+ } else {
+ inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
+ if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) &&
+ (rack->r_rr_config != 3))
+ inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
+ else
+ inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
+ }
+ }
+ if ((rack->use_rack_rr) &&
+ (rack->r_rr_config < 2) &&
+ ((hpts_timeout) && ((hpts_timeout * HPTS_USEC_IN_MSEC) < slot))) {
/*
* Arrange for the hpts to kick back in after the
* t-o if the t-o does not cause a send.
*/
- if (rack->rc_inp->inp_in_hpts == 0)
- tcp_hpts_insert(tp->t_inpcb, HPTS_MS_TO_SLOTS(hpts_timeout));
+ (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_MS_TO_SLOTS(hpts_timeout),
+ __LINE__, &diag);
+ rack_log_hpts_diag(rack, us_cts, &diag, &tv);
rack_log_to_start(rack, cts, hpts_timeout, slot, 0);
+ } else {
+ (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(slot),
+ __LINE__, &diag);
+ rack_log_hpts_diag(rack, us_cts, &diag, &tv);
+ rack_log_to_start(rack, cts, hpts_timeout, slot, 1);
}
} 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_always_pace || rack->r_mbuf_queue) {
+ if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) {
+ /* For a rack timer, don't wake us */
+ inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
+ if (rack->r_rr_config != 3)
+ inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
+ else
+ inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
+ } else {
+ /* All other timers wake us up */
+ 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));
+ (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_MS_TO_SLOTS(hpts_timeout),
+ __LINE__, &diag);
+ rack_log_hpts_diag(rack, us_cts, &diag, &tv);
rack_log_to_start(rack, cts, hpts_timeout, slot, 0);
} else {
/* No timer starting */
@@ -2538,7 +5053,7 @@
}
rack->rc_tmr_stopped = 0;
if (slot)
- rack_log_type_bbrsnd(rack, tot_len_this_send, slot, cts);
+ rack_log_type_bbrsnd(rack, tot_len_this_send, slot, us_cts, &tv);
}
/*
@@ -2559,59 +5074,69 @@
* settings.
*/
struct rack_sendmap *rsm;
- int32_t recovery, ll;
+ int32_t recovery;
if (tp->t_timers->tt_flags & TT_STOPPED) {
return (1);
}
- if (TSTMP_LT(cts, rack->r_ctl.rc_timer_exp)) {
- /* Its not time yet */
- return (0);
- }
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);
+ rack->rc_on_min_to = 0;
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);
+ rack_log_to_event(rack, RACK_TO_FRM_RACK, rsm);
if (rsm) {
uint32_t rtt;
+ rack->r_ctl.rc_resend = rsm;
+ if (rack->use_rack_rr) {
+ /*
+ * Don't accumulate extra pacing delay
+ * we are allowing the rack timer to
+ * over-ride pacing i.e. rrr takes precedence
+ * if the pacing interval is longer than the rrr
+ * time (in other words we get the min pacing
+ * time versus rrr pacing time).
+ */
+ rack->r_timer_override = 1;
+ rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
+ }
rtt = rack->rc_rack_rtt;
if (rtt == 0)
rtt = 1;
- if ((recovery == 0) &&
- (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 = 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, if the rack cheat is
- * on, arrange it so we can send a full segment.
- */
- rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
- rack_log_to_prr(rack, 4);
+ if (rack->rack_no_prr == 0) {
+ if ((recovery == 0) &&
+ (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 = ctf_fixed_maxseg(tp);
+ rack->r_timer_override = 1;
+ rack_log_to_prr(rack, 3, 0);
+ } else if ((rack->r_ctl.rc_prr_sndcnt < (rsm->r_end - rsm->r_start)) &&
+ rack->use_rack_rr) {
+ /*
+ * When a rack timer goes, if the rack rr is
+ * on, arrange it so we can send a full segment
+ * overriding prr (though we pay a price for this
+ * for future new sends).
+ */
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 4, 0);
+ }
}
- } else {
- /* This is a case that should happen rarely if ever */
- counter_u64_add(rack_tlp_does_nada, 1);
-#ifdef TCP_BLACKBOX
- tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
-#endif
- rack->r_ctl.rc_resend = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
}
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK;
+ if (rsm == NULL) {
+ /* restart a timer and return 1 */
+ rack_start_hpts_timer(rack, tp, cts,
+ 0, 0, 0);
+ return (1);
+ }
return (0);
}
@@ -2626,8 +5151,10 @@
nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
nrsm->r_flags = rsm->r_flags;
nrsm->r_dupack = rsm->r_dupack;
+ nrsm->usec_orig_send = rsm->usec_orig_send;
nrsm->r_rtr_bytes = 0;
rsm->r_end = nrsm->r_start;
+ nrsm->r_just_ret = rsm->r_just_ret;
for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
}
@@ -2660,6 +5187,7 @@
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;
@@ -2667,6 +5195,18 @@
l_rsm->r_flags |= RACK_TLP;
if (r_rsm->r_flags & RACK_RWND_COLLAPSED)
l_rsm->r_flags |= RACK_RWND_COLLAPSED;
+ if ((r_rsm->r_flags & RACK_APP_LIMITED) &&
+ ((l_rsm->r_flags & RACK_APP_LIMITED) == 0)) {
+ /*
+ * If both are app-limited then let the
+ * free lower the count. If right is app
+ * limited and left is not, transfer.
+ */
+ l_rsm->r_flags |= RACK_APP_LIMITED;
+ r_rsm->r_flags &= ~RACK_APP_LIMITED;
+ if (r_rsm == rack->r_ctl.rc_first_appl)
+ rack->r_ctl.rc_first_appl = l_rsm;
+ }
rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, r_rsm);
#ifdef INVARIANTS
if (rm != r_rsm) {
@@ -2711,7 +5251,8 @@
/* Its not time yet */
return (0);
}
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
return (1);
}
@@ -2719,7 +5260,7 @@
* 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, 0);
+ rack_log_to_event(rack, RACK_TO_FRM_TLP, NULL);
counter_u64_add(rack_tlp_tot, 1);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
@@ -2735,7 +5276,6 @@
#endif
avail = sbavail(&so->so_snd);
out = tp->snd_max - tp->snd_una;
- rack->tlp_timer_up = 1;
if (out > tp->snd_wnd) {
/* special case, we need a retransmission */
collapsed_win = 1;
@@ -2742,25 +5282,33 @@
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.
+ * Check our send oldest always settings, and if
+ * there is an oldest to send jump to the need_retran.
*/
- if ((avail > out) &&
- ((rack_always_send_oldest == 0) || (TAILQ_EMPTY(&rack->r_ctl.rc_tmap)))) {
+ if (rack_always_send_oldest && (TAILQ_EMPTY(&rack->r_ctl.rc_tmap) == 0))
+ goto need_retran;
+
+ if (avail > out) {
/* New data is available */
amm = avail - out;
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 */
+ if ((amm + out) > tp->snd_wnd) {
+ /* We are rwnd limited */
+ goto need_retran;
+ }
+ } else if (amm < ctf_fixed_maxseg(tp)) {
+ /* not enough to fill a MTU */
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) {
- rack->r_ctl.rc_prr_sndcnt = amm;
- rack_log_to_prr(rack, 4);
+ if (rack->rack_no_prr == 0) {
+ old_prr_snd = rack->r_ctl.rc_prr_sndcnt;
+ if (out + amm <= tp->snd_wnd) {
+ rack->r_ctl.rc_prr_sndcnt = amm;
+ rack_log_to_prr(rack, 4, 0);
+ }
} else
goto need_retran;
} else {
@@ -2770,8 +5318,6 @@
else
goto need_retran;
}
- rack->r_ctl.rc_tlp_seg_send_cnt = 0;
- rack->r_ctl.rc_last_tlp_seq = tp->snd_max;
rack->r_ctl.rc_tlpsend = NULL;
counter_u64_add(rack_tlp_newdata, 1);
goto send;
@@ -2853,48 +5399,11 @@
rsm = nrsm;
}
rack->r_ctl.rc_tlpsend = rsm;
- rack->r_ctl.rc_tlp_rtx_out = 1;
- if (rsm->r_start == rack->r_ctl.rc_last_tlp_seq) {
- rack->r_ctl.rc_tlp_seg_send_cnt++;
- tp->t_rxtshift++;
- } else {
- rack->r_ctl.rc_last_tlp_seq = rsm->r_start;
- rack->r_ctl.rc_tlp_seg_send_cnt = 1;
- }
send:
- rack->r_ctl.rc_tlp_send_cnt++;
- if (rack->r_ctl.rc_tlp_send_cnt > rack_tlp_max_resend) {
- /*
- * Can't [re]/transmit a segment we have not heard from the
- * peer in max times. We need the retransmit timer to take
- * over.
- */
- 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) {
- rsm->r_flags |= RACK_TLP;
- }
- if (rsm && (rsm->r_start == rack->r_ctl.rc_last_tlp_seq) &&
- (rack->r_ctl.rc_tlp_seg_send_cnt > rack_tlp_max_resend)) {
- /*
- * We don't want to send a single segment more than the max
- * either.
- */
- goto restore;
- }
rack->r_timer_override = 1;
- rack->r_tlp_running = 1;
- rack->rc_tlp_in_progress = 1;
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
return (0);
out:
- rack->tlp_timer_up = 0;
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
return (0);
}
@@ -2913,7 +5422,7 @@
if (tp->t_timers->tt_flags & TT_STOPPED) {
return (1);
}
- rack_log_to_event(rack, RACK_TO_FRM_DELACK, 0);
+ rack_log_to_event(rack, RACK_TO_FRM_DELACK, NULL);
tp->t_flags &= ~TF_DELACK;
tp->t_flags |= TF_ACKNOW;
KMOD_TCPSTAT_INC(tcps_delack);
@@ -2922,8 +5431,8 @@
}
/*
- * Persists timer, here we simply need to setup the
- * FORCE-DATA flag the output routine will send
+ * Persists timer, here we simply send the
+ * same thing as a keepalive will.
* the one byte send.
*
* We only return 1, saying don't proceed, if all timers
@@ -2943,7 +5452,9 @@
}
if (rack->rc_in_persist == 0)
return (0);
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, false)) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
+ rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(inp, ETIMEDOUT);
return (1);
}
@@ -2964,12 +5475,13 @@
ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
KMOD_TCPSTAT_INC(tcps_persistdrop);
retval = 1;
+ tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
tcp_set_inp_to_drop(rack->rc_inp, ETIMEDOUT);
goto out;
}
if ((sbavail(&rack->rc_inp->inp_socket->so_snd) == 0) &&
tp->snd_una == tp->snd_max)
- rack_exit_persist(tp, rack);
+ rack_exit_persist(tp, rack, cts);
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT;
/*
* If the user has closed the socket then drop a persisting
@@ -2979,11 +5491,17 @@
(ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
retval = 1;
KMOD_TCPSTAT_INC(tcps_persistdrop);
+ tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
tcp_set_inp_to_drop(rack->rc_inp, ETIMEDOUT);
goto out;
}
t_template = tcpip_maketemplate(rack->rc_inp);
if (t_template) {
+ /* only set it if we were answered */
+ if (rack->forced_ack == 0) {
+ rack->forced_ack = 1;
+ rack->r_ctl.forced_ack_ts = tcp_get_usecs(NULL);
+ }
tcp_respond(tp, t_template->tt_ipgen,
&t_template->tt_t, (struct mbuf *)NULL,
tp->rcv_nxt, tp->snd_una - 1, 0);
@@ -2995,7 +5513,7 @@
if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
tp->t_rxtshift++;
out:
- rack_log_to_event(rack, RACK_TO_FRM_PERSIST, 0);
+ rack_log_to_event(rack, RACK_TO_FRM_PERSIST, NULL);
rack_start_hpts_timer(rack, tp, cts,
0, 0, 0);
return (retval);
@@ -3018,7 +5536,7 @@
}
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP;
inp = tp->t_inpcb;
- rack_log_to_event(rack, RACK_TO_FRM_KEEP, 0);
+ rack_log_to_event(rack, RACK_TO_FRM_KEEP, NULL);
/*
* Keep-alive timer went off; send something or drop connection if
* idle for too long.
@@ -3043,6 +5561,10 @@
KMOD_TCPSTAT_INC(tcps_keepprobe);
t_template = tcpip_maketemplate(inp);
if (t_template) {
+ if (rack->forced_ack == 0) {
+ rack->forced_ack = 1;
+ rack->r_ctl.forced_ack_ts = tcp_get_usecs(NULL);
+ }
tcp_respond(tp, t_template->tt_ipgen,
&t_template->tt_t, (struct mbuf *)NULL,
tp->rcv_nxt, tp->snd_una - 1, 0);
@@ -3053,6 +5575,7 @@
return (1);
dropit:
KMOD_TCPSTAT_INC(tcps_keepdrops);
+ tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX);
tcp_set_inp_to_drop(rack->rc_inp, ETIMEDOUT);
return (1);
}
@@ -3074,7 +5597,7 @@
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, 0);
+ rack_log_to_event(rack, RACK_TO_FRM_TMR, NULL);
if (rack->r_state && (rack->r_state != tp->t_state))
rack_set_state(tp, rack);
/*
@@ -3101,19 +5624,48 @@
}
}
trsm = rsm;
+ if (rsm->r_flags & RACK_ACKED)
+ rsm->r_flags |= RACK_WAS_ACKED;
rsm->r_flags &= ~(RACK_ACKED | RACK_SACK_PASSED | RACK_WAS_SACKPASS);
}
/* Clear the count (we just un-acked them) */
rack->r_ctl.rc_sacked = 0;
+ rack->r_ctl.rc_agg_delayed = 0;
+ rack->r_early = 0;
+ rack->r_ctl.rc_agg_early = 0;
+ rack->r_late = 0;
/* 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 = 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_log_to_prr(rack, 6, 0);
rack->r_timer_override = 1;
}
+static void
+rack_cc_conn_init(struct tcpcb *tp)
+{
+ struct tcp_rack *rack;
+
+
+ rack = (struct tcp_rack *)tp->t_fb_ptr;
+ cc_conn_init(tp);
+ /*
+ * We want a chance to stay in slowstart as
+ * we create a connection. TCP spec says that
+ * initially ssthresh is infinite. For our
+ * purposes that is the snd_wnd.
+ */
+ if (tp->snd_ssthresh < tp->snd_wnd) {
+ tp->snd_ssthresh = tp->snd_wnd;
+ }
+ /*
+ * We also want to assure a IW worth of
+ * data can get inflight.
+ */
+ if (rc_init_window(rack) < tp->snd_cwnd)
+ tp->snd_cwnd = rc_init_window(rack);
+}
+
/*
* Re-transmit timeout! If we drop the PCB we will return 1, otherwise
* we will setup to retransmit the lowest seq number outstanding.
@@ -3130,7 +5682,9 @@
if (tp->t_timers->tt_flags & TT_STOPPED) {
return (1);
}
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, false)) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
+ rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(inp, ETIMEDOUT);
return (1);
}
@@ -3160,6 +5714,7 @@
tp->t_rxtshift = TCP_MAXRXTSHIFT;
KMOD_TCPSTAT_INC(tcps_timeoutdrop);
retval = 1;
+ tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
tcp_set_inp_to_drop(rack->rc_inp,
(tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT));
goto out;
@@ -3319,8 +5874,7 @@
tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
tp->t_srtt = 0;
}
- if (rack_use_sack_filter)
- sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
+ sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
tp->snd_recover = tp->snd_max;
tp->t_flags |= TF_ACKNOW;
tp->t_rtttime = 0;
@@ -3344,6 +5898,20 @@
return (0);
return (1);
}
+ if ((timers & PACE_TMR_RACK) &&
+ rack->rc_on_min_to) {
+ /*
+ * For the rack timer when we
+ * are on a min-timeout (which means rrr_conf = 3)
+ * we don't want to check the timer. It may
+ * be going off for a pace and thats ok we
+ * want to send the retransmit (if its ready).
+ *
+ * If its on a normal rack timer (non-min) then
+ * we will check if its expired.
+ */
+ goto skip_time_check;
+ }
if (TSTMP_LT(cts, rack->r_ctl.rc_timer_exp)) {
uint32_t left;
@@ -3353,6 +5921,12 @@
return (0);
}
if (hpts_calling == 0) {
+ /*
+ * A user send or queued mbuf (sack) has called us? We
+ * return 0 and let the pacing guards
+ * deal with it if they should or
+ * should not cause a send.
+ */
ret = -2;
rack_log_to_processing(rack, cts, ret, 0);
return (0);
@@ -3365,9 +5939,9 @@
left = rack->r_ctl.rc_timer_exp - cts;
tcp_hpts_insert(tp->t_inpcb, HPTS_MS_TO_SLOTS(left));
rack_log_to_processing(rack, cts, ret, left);
- rack->rc_last_pto_set = 0;
return (1);
}
+skip_time_check:
rack->rc_tmr_stopped = 0;
rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK;
if (timers & PACE_TMR_DELACK) {
@@ -3393,12 +5967,22 @@
static void
rack_timer_cancel(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int line)
{
+ struct timeval tv;
+ uint32_t us_cts, flags_on_entry;
uint8_t hpts_removed = 0;
+
+ flags_on_entry = rack->r_ctl.rc_hpts_flags;
+ us_cts = tcp_get_usecs(&tv);
if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
- TSTMP_GEQ(cts, rack->r_ctl.rc_last_output_to)) {
+ ((TSTMP_GEQ(us_cts, rack->r_ctl.rc_last_output_to)) ||
+ ((tp->snd_max - tp->snd_una) == 0))) {
tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT);
hpts_removed = 1;
+ /* If we were not delayed cancel out the flag. */
+ if ((tp->snd_max - tp->snd_una) == 0)
+ rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
+ rack_log_to_cancel(rack, hpts_removed, line, us_cts, &tv, flags_on_entry);
}
if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
rack->rc_tmr_stopped = rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
@@ -3412,9 +5996,10 @@
tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT);
hpts_removed = 1;
}
- rack_log_to_cancel(rack, hpts_removed, line);
rack->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK);
}
+ if (hpts_removed == 0)
+ rack_log_to_cancel(rack, hpts_removed, line, us_cts, &tv, flags_on_entry);
}
static void
@@ -3476,7 +6061,7 @@
rsm->r_rtr_cnt = RACK_NUM_OF_RETRANS;
rsm->r_flags |= RACK_OVERMAX;
}
- if ((rsm->r_rtr_cnt > 1) && (rack->r_tlp_running == 0)) {
+ if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & RACK_TLP) == 0)) {
rack->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start);
rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start);
}
@@ -3577,7 +6162,7 @@
static void
rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len,
uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t ts,
- uint8_t pass, struct rack_sendmap *hintrsm)
+ uint8_t pass, struct rack_sendmap *hintrsm, uint32_t us_cts)
{
struct tcp_rack *rack;
struct rack_sendmap *rsm, *nrsm, *insret, fe;
@@ -3684,6 +6269,7 @@
rsm->r_tim_lastsent[0] = ts;
rsm->r_rtr_cnt = 1;
rsm->r_rtr_bytes = 0;
+ rsm->usec_orig_send = us_cts;
if (th_flags & TH_SYN) {
/* The data space is one beyond snd_una */
rsm->r_start = seq_out + 1;
@@ -3704,6 +6290,20 @@
#endif
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
+ /*
+ * Special case detection, is there just a single
+ * packet outstanding when we are not in recovery?
+ *
+ * If this is true mark it so.
+ */
+ if ((IN_RECOVERY(tp->t_flags) == 0) &&
+ (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) == ctf_fixed_maxseg(tp))) {
+ struct rack_sendmap *prsm;
+
+ prsm = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
+ if (prsm)
+ prsm->r_one_out_nr = 1;
+ }
return;
}
/*
@@ -3809,8 +6409,10 @@
* Record one of the RTT updates from an ack into
* our sample structure.
*/
+
static void
-tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt)
+tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt, uint32_t len, uint32_t us_rtt,
+ int confidence, struct rack_sendmap *rsm, uint16_t rtrcnt)
{
if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
(rack->r_ctl.rack_rs.rs_rtt_lowest > rtt)) {
@@ -3820,6 +6422,55 @@
(rack->r_ctl.rack_rs.rs_rtt_highest < rtt)) {
rack->r_ctl.rack_rs.rs_rtt_highest = rtt;
}
+ if (rack->rc_tp->t_flags & TF_GPUTINPROG) {
+ if (us_rtt < rack->r_ctl.rc_gp_lowrtt)
+ rack->r_ctl.rc_gp_lowrtt = us_rtt;
+ if (rack->rc_tp->snd_wnd > rack->r_ctl.rc_gp_high_rwnd)
+ rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
+ }
+ if ((confidence == 1) &&
+ ((rsm == NULL) ||
+ (rsm->r_just_ret) ||
+ (rsm->r_one_out_nr &&
+ len < (ctf_fixed_maxseg(rack->rc_tp) * 2)))) {
+ /*
+ * If the rsm had a just return
+ * hit it then we can't trust the
+ * rtt measurement for buffer deterimination
+ * Note that a confidence of 2, indicates
+ * SACK'd which overrides the r_just_ret or
+ * the r_one_out_nr. If it was a CUM-ACK and
+ * we had only two outstanding, but get an
+ * ack for only 1. Then that also lowers our
+ * confidence.
+ */
+ confidence = 0;
+ }
+ if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
+ (rack->r_ctl.rack_rs.rs_us_rtt > us_rtt)) {
+ if (rack->r_ctl.rack_rs.confidence == 0) {
+ /*
+ * We take anything with no current confidence
+ * saved.
+ */
+ rack->r_ctl.rack_rs.rs_us_rtt = us_rtt;
+ rack->r_ctl.rack_rs.confidence = confidence;
+ rack->r_ctl.rack_rs.rs_us_rtrcnt = rtrcnt;
+ } else if (confidence || rack->r_ctl.rack_rs.confidence) {
+ /*
+ * Once we have a confident number,
+ * we can update it with a smaller
+ * value since this confident number
+ * may include the DSACK time until
+ * the next segment (the second one) arrived.
+ */
+ rack->r_ctl.rack_rs.rs_us_rtt = us_rtt;
+ rack->r_ctl.rack_rs.confidence = confidence;
+ rack->r_ctl.rack_rs.rs_us_rtrcnt = rtrcnt;
+ }
+
+ }
+ rack_log_rtt_upd(rack->rc_tp, rack, us_rtt, len, rsm, confidence);
rack->r_ctl.rack_rs.rs_flags = RACK_RTT_VALID;
rack->r_ctl.rack_rs.rs_rtt_tot += rtt;
rack->r_ctl.rack_rs.rs_rtt_cnt++;
@@ -3834,6 +6485,7 @@
{
int32_t delta;
uint32_t o_srtt, o_var;
+ int32_t hrtt_up = 0;
int32_t rtt;
if (rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY)
@@ -3857,6 +6509,56 @@
}
if (rtt == 0)
rtt = 1;
+ if (rack->rc_gp_rtt_set == 0) {
+ /*
+ * With no RTT we have to accept
+ * even one we are not confident of.
+ */
+ rack->r_ctl.rc_gp_srtt = rack->r_ctl.rack_rs.rs_us_rtt;
+ rack->rc_gp_rtt_set = 1;
+ } else if (rack->r_ctl.rack_rs.confidence) {
+ /* update the running gp srtt */
+ rack->r_ctl.rc_gp_srtt -= (rack->r_ctl.rc_gp_srtt/8);
+ rack->r_ctl.rc_gp_srtt += rack->r_ctl.rack_rs.rs_us_rtt / 8;
+ }
+ if (rack->r_ctl.rack_rs.confidence) {
+ /*
+ * record the low and high for highly buffered path computation,
+ * we only do this if we are confident (not a retransmission).
+ */
+ if (rack->r_ctl.rc_highest_us_rtt < rack->r_ctl.rack_rs.rs_us_rtt) {
+ rack->r_ctl.rc_highest_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
+ hrtt_up = 1;
+ }
+ if (rack->rc_highly_buffered == 0) {
+ /*
+ * Currently once we declare a path has
+ * highly buffered there is no going
+ * back, which may be a problem...
+ */
+ if ((rack->r_ctl.rc_highest_us_rtt / rack->r_ctl.rc_lowest_us_rtt) > rack_hbp_thresh) {
+ rack_log_rtt_shrinks(rack, rack->r_ctl.rack_rs.rs_us_rtt,
+ rack->r_ctl.rc_highest_us_rtt,
+ rack->r_ctl.rc_lowest_us_rtt,
+ RACK_RTTS_SEEHBP);
+ rack->rc_highly_buffered = 1;
+ }
+ }
+ }
+ if ((rack->r_ctl.rack_rs.confidence) ||
+ (rack->r_ctl.rack_rs.rs_us_rtrcnt == 1)) {
+ /*
+ * If we are highly confident of it <or> it was
+ * never retransmitted we accept it as the last us_rtt.
+ */
+ rack->r_ctl.rc_last_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
+ /* The lowest rtt can be set if its was not retransmited */
+ if (rack->r_ctl.rc_lowest_us_rtt > rack->r_ctl.rack_rs.rs_us_rtt) {
+ rack->r_ctl.rc_lowest_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
+ if (rack->r_ctl.rc_lowest_us_rtt == 0)
+ rack->r_ctl.rc_lowest_us_rtt = 1;
+ }
+ }
rack_log_rtt_sample(rack, rtt);
o_srtt = tp->t_srtt;
o_var = tp->t_rttvar;
@@ -3905,7 +6607,6 @@
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
}
KMOD_TCPSTAT_INC(tcps_rttupdated);
- rack_log_rtt_upd(tp, rack, rtt, o_srtt, o_var);
tp->t_rttupdated++;
#ifdef STATS
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt));
@@ -3980,30 +6681,78 @@
counter_u64_add(rack_badfr_bytes, (rsm->r_end - rsm->r_start));
}
+static void
+rack_apply_updated_usrtt(struct tcp_rack *rack, uint32_t us_rtt, uint32_t us_cts)
+{
+ /*
+ * Apply to filter the inbound us-rtt at us_cts.
+ */
+ uint32_t old_rtt;
+ old_rtt = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
+ apply_filter_min_small(&rack->r_ctl.rc_gp_min_rtt,
+ us_rtt, us_cts);
+ if (rack->r_ctl.last_pacing_time &&
+ rack->rc_gp_dyn_mul &&
+ (rack->r_ctl.last_pacing_time > us_rtt))
+ rack->pacing_longer_than_rtt = 1;
+ else
+ rack->pacing_longer_than_rtt = 0;
+ if (old_rtt > us_rtt) {
+ /* We just hit a new lower rtt time */
+ rack_log_rtt_shrinks(rack, us_cts, old_rtt,
+ __LINE__, RACK_RTTS_NEWRTT);
+ /*
+ * Only count it if its lower than what we saw within our
+ * calculated range.
+ */
+ if ((old_rtt - us_rtt) > rack_min_rtt_movement) {
+ if (rack_probertt_lower_within &&
+ rack->rc_gp_dyn_mul &&
+ (rack->use_fixed_rate == 0) &&
+ (rack->rc_always_pace)) {
+ /*
+ * We are seeing a new lower rtt very close
+ * to the time that we would have entered probe-rtt.
+ * This is probably due to the fact that a peer flow
+ * has entered probe-rtt. Lets go in now too.
+ */
+ uint32_t val;
+
+ val = rack_probertt_lower_within * rack_time_between_probertt;
+ val /= 100;
+ if ((rack->in_probe_rtt == 0) &&
+ ((us_cts - rack->r_ctl.rc_lower_rtt_us_cts) >= (rack_time_between_probertt - val))) {
+ rack_enter_probertt(rack, us_cts);
+ }
+ }
+ rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
+ }
+ }
+}
+
static int
rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
- struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type)
+ struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, tcp_seq th_ack)
{
int32_t i;
- uint32_t t;
+ uint32_t t, len_acked;
- if (rsm->r_flags & RACK_ACKED)
+ if ((rsm->r_flags & RACK_ACKED) ||
+ (rsm->r_flags & RACK_WAS_ACKED))
/* Already done */
return (0);
+ if (ack_type == CUM_ACKED) {
+ if (SEQ_GT(th_ack, rsm->r_end))
+ len_acked = rsm->r_end - rsm->r_start;
+ else
+ len_acked = th_ack - rsm->r_start;
+ } else
+ len_acked = rsm->r_end - rsm->r_start;
+ if (rsm->r_rtr_cnt == 1) {
+ uint32_t us_rtt;
- if ((rsm->r_rtr_cnt == 1) ||
- ((ack_type == CUM_ACKED) &&
- (to->to_flags & TOF_TS) &&
- (to->to_tsecr) &&
- (rsm->r_tim_lastsent[rsm->r_rtr_cnt - 1] == to->to_tsecr))
- ) {
- /*
- * We will only find a matching timestamp if its cum-acked.
- * But if its only one retransmission its for-sure matching
- * :-)
- */
t = cts - rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
if ((int)t <= 0)
t = 1;
@@ -4016,7 +6765,22 @@
rack->r_ctl.rc_rack_min_rtt = 1;
}
}
- tcp_rack_xmit_timer(rack, t + 1);
+ us_rtt = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time) - rsm->usec_orig_send;
+ if (us_rtt == 0)
+ us_rtt = 1;
+ rack_apply_updated_usrtt(rack, us_rtt, tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time));
+ if (ack_type == SACKED)
+ tcp_rack_xmit_timer(rack, t + 1, len_acked, us_rtt, 2 , rsm, rsm->r_rtr_cnt);
+ else {
+ /*
+ * For cum-ack we are only confident if what
+ * is being acked is included in a measurement.
+ * Otherwise it could be an idle period that
+ * includes Delayed-ack time.
+ */
+ tcp_rack_xmit_timer(rack, t + 1, len_acked, us_rtt,
+ (rack->app_limited_needs_set ? 0 : 1), rsm, rsm->r_rtr_cnt);
+ }
if ((rsm->r_flags & RACK_TLP) &&
(!IN_RECOVERY(tp->t_flags))) {
/* Segment was a TLP and our retrans matched */
@@ -4029,8 +6793,10 @@
* When we enter recovery we need to assure
* we send one packet.
*/
- rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
- rack_log_to_prr(rack, 7);
+ if (rack->rack_no_prr == 0) {
+ rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
+ rack_log_to_prr(rack, 7, 0);
+ }
}
}
if (SEQ_LT(rack->r_ctl.rc_rack_tmit_time, rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)])) {
@@ -4072,18 +6838,6 @@
rack->r_ctl.rc_rack_min_rtt = 1;
}
}
- /*
- * Note the following calls to
- * tcp_rack_xmit_timer() are being commented
- * out for now. They give us no more accuracy
- * and often lead to a wrong choice. We have
- * enough samples that have not been
- * retransmitted. I leave the commented out
- * code in here in case in the future we
- * decide to add it back (though I can't forsee
- * doing that). That way we will easily see
- * where they need to be placed.
- */
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 */
@@ -4090,6 +6844,8 @@
rack->r_ctl.rc_rack_tmit_time = rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
rack->rc_rack_rtt = t;
}
+ tcp_rack_xmit_timer(rack, t + 1, len_acked, (t * HPTS_USEC_IN_MSEC), 0, rsm,
+ rsm->r_rtr_cnt);
return (1);
}
}
@@ -4176,6 +6932,123 @@
}
}
+static void
+rack_need_set_test(struct tcpcb *tp,
+ struct tcp_rack *rack,
+ struct rack_sendmap *rsm,
+ tcp_seq th_ack,
+ int line,
+ int use_which)
+{
+
+ if ((tp->t_flags & TF_GPUTINPROG) &&
+ SEQ_GEQ(rsm->r_end, tp->gput_seq)) {
+ /*
+ * We were app limited, and this ack
+ * butts up or goes beyond the point where we want
+ * to start our next measurement. We need
+ * to record the new gput_ts as here and
+ * possibly update the start sequence.
+ */
+ uint32_t seq, ts;
+
+ if (rsm->r_rtr_cnt > 1) {
+ /*
+ * This is a retransmit, can we
+ * really make any assessment at this
+ * point? We are not really sure of
+ * the timestamp, is it this or the
+ * previous transmission?
+ *
+ * Lets wait for something better that
+ * is not retransmitted.
+ */
+ return;
+ }
+ seq = tp->gput_seq;
+ ts = tp->gput_ts;
+ rack->app_limited_needs_set = 0;
+ tp->gput_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
+ /* Do we start at a new end? */
+ if ((use_which == RACK_USE_BEG) &&
+ SEQ_GEQ(rsm->r_start, tp->gput_seq)) {
+ /*
+ * When we get an ACK that just eats
+ * up some of the rsm, we set RACK_USE_BEG
+ * since whats at r_start (i.e. th_ack)
+ * is left unacked and thats where the
+ * measurement not starts.
+ */
+ tp->gput_seq = rsm->r_start;
+ rack->r_ctl.rc_gp_output_ts = rsm->usec_orig_send;
+ }
+ if ((use_which == RACK_USE_END) &&
+ SEQ_GEQ(rsm->r_end, tp->gput_seq)) {
+ /*
+ * We use the end when the cumack
+ * is moving forward and completely
+ * deleting the rsm passed so basically
+ * r_end holds th_ack.
+ *
+ * For SACK's we also want to use the end
+ * since this piece just got sacked and
+ * we want to target anything after that
+ * in our measurement.
+ */
+ tp->gput_seq = rsm->r_end;
+ rack->r_ctl.rc_gp_output_ts = rsm->usec_orig_send;
+ }
+ if (use_which == RACK_USE_END_OR_THACK) {
+ /*
+ * special case for ack moving forward,
+ * not a sack, we need to move all the
+ * way up to where this ack cum-ack moves
+ * to.
+ */
+ if (SEQ_GT(th_ack, rsm->r_end))
+ tp->gput_seq = th_ack;
+ else
+ tp->gput_seq = rsm->r_end;
+ rack->r_ctl.rc_gp_output_ts = rsm->usec_orig_send;
+ }
+ if (SEQ_GT(tp->gput_seq, tp->gput_ack)) {
+ /*
+ * We moved beyond this guy's range, re-calculate
+ * the new end point.
+ */
+ if (rack->rc_gp_filled == 0) {
+ tp->gput_ack = tp->gput_seq + max(rc_init_window(rack), (MIN_GP_WIN * ctf_fixed_maxseg(tp)));
+ } else {
+ tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
+ }
+ }
+ /*
+ * We are moving the goal post, we may be able to clear the
+ * measure_saw_probe_rtt flag.
+ */
+ if ((rack->in_probe_rtt == 0) &&
+ (rack->measure_saw_probe_rtt) &&
+ (SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
+ rack->measure_saw_probe_rtt = 0;
+ rack_log_pacing_delay_calc(rack, ts, tp->gput_ts,
+ seq, tp->gput_seq, 0, 5, line, NULL);
+ if (rack->rc_gp_filled &&
+ ((tp->gput_ack - tp->gput_seq) <
+ max(rc_init_window(rack), (MIN_GP_WIN *
+ ctf_fixed_maxseg(tp))))) {
+ /*
+ * There is no sense of continuing this measurement
+ * because its too small to gain us anything we
+ * trust. Skip it and that way we can start a new
+ * measurement quicker.
+ */
+ rack_log_pacing_delay_calc(rack, tp->gput_ack, tp->gput_seq,
+ 0, 0, 0, 6, __LINE__, NULL);
+ tp->t_flags &= ~TF_GPUTINPROG;
+ }
+ }
+}
+
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, int *moved_two)
@@ -4253,11 +7126,14 @@
next->r_start = start;
/* Clear out the dup ack count of the remainder */
rsm->r_dupack = 0;
+ rsm->r_just_ret = 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);
+ rack_update_rtt(tp, rack, nrsm, to, cts, SACKED, 0);
+ if (rack->app_limited_needs_set)
+ rack_need_set_test(tp, rack, nrsm, tp->snd_una, __LINE__, RACK_USE_END);
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) {
@@ -4323,6 +7199,7 @@
}
counter_u64_add(rack_sack_splits, 1);
rack_clone_rsm(rack, nrsm, rsm, start);
+ rsm->r_just_ret = 0;
insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
#ifdef INVARIANTS
if (insret != NULL) {
@@ -4373,10 +7250,8 @@
* <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);
+ rack_update_rtt(tp, rack, rsm, to, cts, SACKED, 0);
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 */
@@ -4387,6 +7262,9 @@
counter_u64_add(rack_reorder_seen, 1);
rack->r_ctl.rc_reorder_ts = cts;
}
+ if (rack->app_limited_needs_set)
+ rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_END);
+ rsm->r_ack_arrival = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
rsm->r_flags |= RACK_ACKED;
rsm->r_flags &= ~RACK_TLP;
if (rsm->r_in_tmap) {
@@ -4452,7 +7330,9 @@
* to prev). Update the rtt and changed
* based on that. Also check for reordering.
*/
- rack_update_rtt(tp, rack, nrsm, to, cts, SACKED);
+ rack_update_rtt(tp, rack, nrsm, to, cts, SACKED, 0);
+ if (rack->app_limited_needs_set)
+ rack_need_set_test(tp, rack, nrsm, tp->snd_una, __LINE__, RACK_USE_END);
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) {
@@ -4493,6 +7373,7 @@
counter_u64_add(rack_sack_splits, 1);
rack_clone_rsm(rack, nrsm, rsm, end);
rsm->r_flags &= (~RACK_HAS_FIN);
+ rsm->r_just_ret = 0;
insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
#ifdef INVARIANTS
if (insret != NULL) {
@@ -4506,9 +7387,7 @@
}
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);
+ rack_update_rtt(tp, rack, rsm, to, cts, SACKED, 0);
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 */
@@ -4519,6 +7398,9 @@
counter_u64_add(rack_reorder_seen, 1);
rack->r_ctl.rc_reorder_ts = cts;
}
+ if (rack->app_limited_needs_set)
+ rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_END);
+ rsm->r_ack_arrival = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
rsm->r_flags |= RACK_ACKED;
rsm->r_flags &= ~RACK_TLP;
if (rsm->r_in_tmap) {
@@ -4607,8 +7489,7 @@
* Now lets possibly clear the sack filter so we start
* recognizing sacks that cover this area.
*/
- if (rack_use_sack_filter)
- sack_filter_clear(&rack->r_ctl.rack_sf, th_ack);
+ sack_filter_clear(&rack->r_ctl.rack_sf, th_ack);
}
@@ -4615,7 +7496,6 @@
static void
rack_do_decay(struct tcp_rack *rack)
{
-#ifdef NETFLIX_EXP_DETECTION
struct timeval res;
#define timersub(tvp, uvp, vvp) \
@@ -4628,7 +7508,7 @@
} \
} while (0)
- timersub(&rack->r_ctl.rc_last_ack, &rack->r_ctl.rc_last_time_decay, &res);
+ timersub(&rack->r_ctl.act_rcv_time, &rack->r_ctl.rc_last_time_decay, &res);
#undef timersub
rack->r_ctl.input_pkt++;
@@ -4645,8 +7525,9 @@
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;
+ rack->r_ctl.rc_last_time_decay = rack->r_ctl.act_rcv_time;
/* Now do we escape without decay? */
+#ifdef NETFLIX_EXP_DETECTION
if (rack->rc_in_persist ||
(rack->rc_tp->snd_max == rack->rc_tp->snd_una) ||
(pkt_delta < tcp_sad_low_pps)){
@@ -4665,8 +7546,8 @@
tcp_sad_decay_val);
rack->r_ctl.sack_noextra_move = ctf_decay_count(rack->r_ctl.sack_noextra_move,
tcp_sad_decay_val);
+#endif
}
-#endif
}
static void
@@ -4680,7 +7561,9 @@
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;
+ uint32_t tsused;
+
INP_WLOCK_ASSERT(tp->t_inpcb);
if (th->th_flags & TH_RST) {
/* We don't log resets */
@@ -4725,8 +7608,8 @@
* the packets in the rack log and calculate any eligble
* RTT's.
*/
- rack->r_wanted_output++;
- more:
+ rack->r_wanted_output = 1;
+more:
rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
if (rsm == NULL) {
if ((th_ack - 1) == tp->iss) {
@@ -4759,16 +7642,17 @@
#endif
goto proc_sack;
}
- rack_update_rtt(tp, rack, rsm, to, cts, CUM_ACKED);
+ rack_update_rtt(tp, rack, rsm, to, cts, CUM_ACKED, th_ack);
/* Now do we consume the whole thing? */
if (SEQ_GEQ(th_ack, rsm->r_end)) {
/* Its all consumed. */
uint32_t left;
+ uint8_t newly_acked;
rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
rsm->r_rtr_bytes = 0;
- if (rsm->r_flags & RACK_TLP)
- rack->r_ctl.rc_tlp_rtx_out = 0;
+ /* Record the time of highest cumack sent */
+ rack->r_ctl.rc_gp_cumack_ts = rsm->usec_orig_send;
rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
#ifdef INVARIANTS
if (rm != rsm) {
@@ -4780,6 +7664,7 @@
TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 0;
}
+ newly_acked = 1;
if (rsm->r_flags & RACK_ACKED) {
/*
* It was acked on the scoreboard -- remove
@@ -4786,6 +7671,7 @@
* it from total
*/
rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
+ newly_acked = 0;
} else if (rsm->r_flags & RACK_SACK_PASSED) {
/*
* There are segments ACKED on the
@@ -4794,22 +7680,13 @@
*/
rsm->r_flags &= ~RACK_SACK_PASSED;
counter_u64_add(rack_reorder_seen, 1);
+ rsm->r_ack_arrival = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
rsm->r_flags |= RACK_ACKED;
rack->r_ctl.rc_reorder_ts = cts;
}
left = th_ack - rsm->r_end;
- if (rsm->r_rtr_cnt > 1) {
- /*
- * Technically we should make r_rtr_cnt be
- * monotonicly increasing and just mod it to
- * the timestamp it is replacing.. that way
- * we would have the last 3 retransmits. Now
- * rc_loss_count will be wrong if we
- * retransmit something more than 2 times in
- * recovery :(
- */
- rack->r_ctl.rc_loss_count += (rsm->r_rtr_cnt - 1);
- }
+ if (rack->app_limited_needs_set && newly_acked)
+ rack_need_set_test(tp, rack, rsm, th_ack, __LINE__, RACK_USE_END_OR_THACK);
/* Free back to zone */
rack_free(rack, rsm);
if (left) {
@@ -4843,8 +7720,15 @@
rsm->r_rtr_bytes -= ack_am;
}
}
- /* Update where the piece starts */
+ /*
+ * Update where the piece starts and record
+ * the time of send of highest cumack sent.
+ */
+ rack->r_ctl.rc_gp_cumack_ts = rsm->usec_orig_send;
rsm->r_start = th_ack;
+ if (rack->app_limited_needs_set)
+ rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_BEG);
+
}
proc_sack:
/* Check for reneging */
@@ -4902,11 +7786,9 @@
* Sort the SACK blocks so we can update the rack scoreboard with
* just one pass.
*/
- if (rack_use_sack_filter) {
- num_sack_blks = sack_filter_blks(&rack->r_ctl.rack_sf, sack_blocks,
- num_sack_blks, th->th_ack);
- ctf_log_sack_filter(rack->rc_tp, num_sack_blks, sack_blocks);
- }
+ num_sack_blks = sack_filter_blks(&rack->r_ctl.rack_sf, sack_blocks,
+ 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;
@@ -4980,7 +7862,7 @@
*/
acked = rack_proc_sack_blk(tp, rack, &sack_blocks[0], to, &rsm, cts, &moved_two);
if (acked) {
- rack->r_wanted_output++;
+ rack->r_wanted_output = 1;
changed += acked;
sack_changed += acked;
}
@@ -5044,7 +7926,7 @@
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++;
+ rack->r_wanted_output = 1;
changed += acked;
sack_changed += acked;
}
@@ -5193,34 +8075,42 @@
/* Something changed cancel the rack timer */
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
}
- if ((sack_changed) && (!IN_RECOVERY(tp->t_flags))) {
+ tsused = tcp_ts_getticks();
+ rsm = tcp_rack_output(tp, rack, tsused);
+ if ((!IN_RECOVERY(tp->t_flags)) &&
+ rsm) {
+ /* Enter recovery */
+ rack->r_ctl.rc_rsm_start = rsm->r_start;
+ rack->r_ctl.rc_cwnd_at = tp->snd_cwnd;
+ rack->r_ctl.rc_ssthresh_at = tp->snd_ssthresh;
+ entered_recovery = 1;
+ rack_cong_signal(tp, NULL, CC_NDUPACK);
/*
- * Ok we have a high probability that we need to go in to
- * recovery since we have data sack'd
+ * When we enter recovery we need to assure we send
+ * one packet.
*/
- struct rack_sendmap *rsm;
- uint32_t tsused;
-
- tsused = tcp_ts_getticks();
- rsm = tcp_rack_output(tp, rack, tsused);
- if (rsm) {
- /* Enter recovery */
- rack->r_ctl.rc_rsm_start = rsm->r_start;
- rack->r_ctl.rc_cwnd_at = tp->snd_cwnd;
- rack->r_ctl.rc_ssthresh_at = tp->snd_ssthresh;
- entered_recovery = 1;
- rack_cong_signal(tp, NULL, CC_NDUPACK);
- /*
- * When we enter recovery we need to assure we send
- * one packet.
- */
+ if (rack->rack_no_prr == 0) {
rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
- rack_log_to_prr(rack, 8);
- rack->r_timer_override = 1;
+ rack_log_to_prr(rack, 8, 0);
}
+ rack->r_timer_override = 1;
+ rack->r_early = 0;
+ rack->r_ctl.rc_agg_early = 0;
+ } else if (IN_RECOVERY(tp->t_flags) &&
+ rsm &&
+ (rack->r_rr_config == 3)) {
+ /*
+ * Assure we can output and we get no
+ * remembered pace time except the retransmit.
+ */
+ rack->r_timer_override = 1;
+ rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
+ rack->r_ctl.rc_resend = rsm;
}
- if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) {
- /* Deal with changed and PRR here (in recovery only) */
+ if (IN_RECOVERY(tp->t_flags) &&
+ (rack->rack_no_prr == 0) &&
+ (entered_recovery == 0)) {
+ /* Deal with PRR here (in recovery only) */
uint32_t pipe, snd_una;
rack->r_ctl.rc_prr_delivered += changed;
@@ -5239,7 +8129,7 @@
sndcnt /= (long)rack->r_ctl.rc_prr_recovery_fs;
else {
rack->r_ctl.rc_prr_sndcnt = 0;
- rack_log_to_prr(rack, 9);
+ rack_log_to_prr(rack, 9, 0);
sndcnt = 0;
}
sndcnt++;
@@ -5248,7 +8138,7 @@
else
sndcnt = 0;
rack->r_ctl.rc_prr_sndcnt = sndcnt;
- rack_log_to_prr(rack, 10);
+ rack_log_to_prr(rack, 10, 0);
} else {
uint32_t limit;
@@ -5261,13 +8151,21 @@
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);
+ rack_log_to_prr(rack, 11, 0);
} else {
rack->r_ctl.rc_prr_sndcnt = min(0, limit);
- rack_log_to_prr(rack, 12);
+ rack_log_to_prr(rack, 12, 0);
}
}
- if (rack->r_ctl.rc_prr_sndcnt >= ctf_fixed_maxseg(tp)) {
+ if ((rsm && (rack->r_ctl.rc_prr_sndcnt >= ctf_fixed_maxseg(tp)) &&
+ ((rack->rc_inp->inp_in_hpts == 0) &&
+ ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0)))) {
+ /*
+ * If you are pacing output you don't want
+ * to override.
+ */
+ rack->r_early = 0;
+ rack->r_ctl.rc_agg_early = 0;
rack->r_timer_override = 1;
}
}
@@ -5290,6 +8188,114 @@
}
}
+static void
+rack_check_bottom_drag(struct tcpcb *tp,
+ struct tcp_rack *rack,
+ struct socket *so, int32_t acked)
+{
+ uint32_t segsiz, minseg;
+
+ segsiz = ctf_fixed_maxseg(tp);
+ if (so->so_snd.sb_flags & SB_TLS_IFNET) {
+ minseg = rack->r_ctl.rc_pace_min_segs;
+ } else {
+ minseg = segsiz;
+ }
+ if (tp->snd_max == tp->snd_una) {
+ /*
+ * We are doing dynamic pacing and we are way
+ * under. Basically everything got acked while
+ * we were still waiting on the pacer to expire.
+ *
+ * This means we need to boost the b/w in
+ * addition to any earlier boosting of
+ * the multipler.
+ */
+ rack->rc_dragged_bottom = 1;
+ rack_validate_multipliers_at_or_above100(rack);
+ /*
+ * Lets use the segment bytes acked plus
+ * the lowest RTT seen as the basis to
+ * form a b/w estimate. This will be off
+ * due to the fact that the true estimate
+ * should be around 1/2 the time of the RTT
+ * but we can settle for that.
+ */
+ if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_VALID) &&
+ acked) {
+ uint64_t bw, calc_bw, rtt;
+
+ rtt = rack->r_ctl.rack_rs.rs_us_rtt;
+ bw = acked;
+ calc_bw = bw * 1000000;
+ calc_bw /= rtt;
+ if (rack->r_ctl.last_max_bw &&
+ (rack->r_ctl.last_max_bw < calc_bw)) {
+ /*
+ * If we have a last calculated max bw
+ * enforce it.
+ */
+ calc_bw = rack->r_ctl.last_max_bw;
+ }
+ /* now plop it in */
+ if (rack->rc_gp_filled == 0) {
+ if (calc_bw > ONE_POINT_TWO_MEG) {
+ /*
+ * If we have no measurement
+ * don't let us set in more than
+ * 1.2Mbps. If we are still too
+ * low after pacing with this we
+ * will hopefully have a max b/w
+ * available to sanity check things.
+ */
+ calc_bw = ONE_POINT_TWO_MEG;
+ }
+ rack->r_ctl.rc_rtt_diff = 0;
+ rack->r_ctl.gp_bw = calc_bw;
+ rack->rc_gp_filled = 1;
+ rack->r_ctl.num_avg = RACK_REQ_AVG;
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+ } else if (calc_bw > rack->r_ctl.gp_bw) {
+ rack->r_ctl.rc_rtt_diff = 0;
+ rack->r_ctl.num_avg = RACK_REQ_AVG;
+ rack->r_ctl.gp_bw = calc_bw;
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+ } else
+ rack_increase_bw_mul(rack, -1, 0, 0, 1);
+ /*
+ * For acks over 1mss we do a extra boost to simulate
+ * where we would get 2 acks (we want 110 for the mul).
+ */
+ if (acked > segsiz)
+ rack_increase_bw_mul(rack, -1, 0, 0, 1);
+ } else {
+ /*
+ * Huh, this should not be, settle
+ * for just an old increase.
+ */
+ rack_increase_bw_mul(rack, -1, 0, 0, 1);
+ }
+ } else if ((IN_RECOVERY(tp->t_flags) == 0) &&
+ (sbavail(&so->so_snd) > max((segsiz * (4 + rack_req_segs)),
+ minseg)) &&
+ (rack->r_ctl.cwnd_to_use > max((segsiz * (rack_req_segs + 2)), minseg)) &&
+ (tp->snd_wnd > max((segsiz * (rack_req_segs + 2)), minseg)) &&
+ (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) <=
+ (segsiz * rack_req_segs))) {
+ /*
+ * We are doing dynamic GP pacing and
+ * we have everything except 1MSS or less
+ * bytes left out. We are still pacing away.
+ * And there is data that could be sent, This
+ * means we are inserting delayed ack time in
+ * our measurements because we are pacing too slow.
+ */
+ rack_validate_multipliers_at_or_above100(rack);
+ rack->rc_dragged_bottom = 1;
+ rack_increase_bw_mul(rack, -1, 0, 0, 1);
+ }
+}
+
/*
* Return value of 1, we do not need to call rack_process_data().
* return value of 0, rack_process_data can be called.
@@ -5307,14 +8313,19 @@
int32_t acked;
struct mbuf *mfree;
struct tcp_rack *rack;
+ int32_t under_pacing = 0;
int32_t recovery = 0;
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (SEQ_GT(th->th_ack, tp->snd_max)) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val);
- rack->r_wanted_output++;
+ rack->r_wanted_output = 1;
return (1);
}
+ if (rack->rc_gp_filled &&
+ (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
+ under_pacing = 1;
+ }
if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) {
if (rack->rc_in_persist)
tp->t_rxtshift = 0;
@@ -5358,7 +8369,6 @@
acked = BYTES_THIS_ACK(tp, th);
KMOD_TCPSTAT_ADD(tcps_rcvackpack, nsegs);
KMOD_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
@@ -5371,6 +8381,21 @@
(int)(ticks - tp->t_badrxtwin) < 0)
rack_cong_signal(tp, th, CC_RTO_ERR);
}
+ if (acked) {
+ /* assure we are not backed off */
+ tp->t_rxtshift = 0;
+ rack->rc_tlp_in_progress = 0;
+ rack->r_ctl.rc_tlp_cnt_out = 0;
+ /*
+ * If it is the RXT timer we want to
+ * stop it, so we can restart a TLP.
+ */
+ if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
+ rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
+#ifdef NETFLIX_HTTP_LOGGING
+ tcp_http_check_for_comp(rack->rc_tp, th->th_ack);
+#endif
+ }
/*
* If we have a timestamp reply, update smoothed round trip time. If
* no timestamp is present but transmit timer is running and timed
@@ -5389,10 +8414,6 @@
* data to be acked, restart retransmit timer, using current
* (possibly backed-off) value.
*/
- if (th->th_ack == tp->snd_max) {
- rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
- rack->r_wanted_output++;
- }
if (acked == 0) {
if (ofia)
*ofia = ourfinisacked;
@@ -5421,7 +8442,14 @@
mfree = sbcut_locked(&so->so_snd, acked_amount);
if ((sbused(&so->so_snd) == 0) &&
(acked > acked_amount) &&
- (tp->t_state >= TCPS_FIN_WAIT_1)) {
+ (tp->t_state >= TCPS_FIN_WAIT_1) &&
+ (tp->t_flags & TF_SENTFIN)) {
+ /*
+ * We must be sure our fin
+ * was sent and acked (we can be
+ * in FIN_WAIT_1 without having
+ * sent the fin).
+ */
ourfinisacked = 1;
}
/* NB: sowwakeup_locked() does an implicit unlock. */
@@ -5444,16 +8472,26 @@
if (SEQ_LT(tp->snd_nxt, tp->snd_una)) {
tp->snd_nxt = tp->snd_una;
}
+ if (under_pacing &&
+ (rack->use_fixed_rate == 0) &&
+ (rack->in_probe_rtt == 0) &&
+ rack->rc_gp_dyn_mul &&
+ rack->rc_always_pace) {
+ /* Check if we are dragging bottom */
+ rack_check_bottom_drag(tp, rack, so, acked);
+ }
if (tp->snd_una == tp->snd_max) {
/* Nothing left outstanding */
+ rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
+ if (rack->r_ctl.rc_went_idle_time == 0)
+ rack->r_ctl.rc_went_idle_time = 1;
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
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++;
- if (rack_use_sack_filter)
- sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
+ rack->r_wanted_output = 1;
+ sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
(sbavail(&so->so_snd) == 0) &&
(tp->t_flags2 & TF2_DROP_AF_DATA)) {
@@ -5463,9 +8501,12 @@
* reset him.
*/
*ret_val = 1;
+ /* tcp_close will kill the inp pre-log the Reset */
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
tp = tcp_close(tp);
ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen);
return (1);
+
}
}
if (ofia)
@@ -5494,10 +8535,8 @@
*/
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 */
@@ -5559,6 +8598,31 @@
rack->rc_has_collapsed = 0;
}
+static void
+rack_handle_delayed_ack(struct tcpcb *tp, struct tcp_rack *rack,
+ int32_t tlen, int32_t tfo_syn)
+{
+ if (DELAY_ACK(tp, tlen) || tfo_syn) {
+ if (rack->rc_dack_mode &&
+ (tlen > 500) &&
+ (rack->rc_dack_toggle == 1)) {
+ goto no_delayed_ack;
+ }
+ rack_timer_cancel(tp, rack,
+ rack->r_ctl.rc_rcvtime, __LINE__);
+ tp->t_flags |= TF_DELACK;
+ } else {
+no_delayed_ack:
+ rack->r_wanted_output = 1;
+ tp->t_flags |= TF_ACKNOW;
+ if (rack->rc_dack_mode) {
+ if (tp->t_flags & TF_DELACK)
+ rack->rc_dack_toggle = 1;
+ else
+ rack->rc_dack_toggle = 0;
+ }
+ }
+}
/*
* Return value of 1, the TCB is unlocked and most
* likely gone, return value of 0, the TCP is still
@@ -5593,7 +8657,7 @@
tp->snd_wl2 = th->th_ack;
if (tp->snd_wnd > tp->max_sndwnd)
tp->max_sndwnd = tp->snd_wnd;
- rack->r_wanted_output++;
+ rack->r_wanted_output = 1;
} else if (thflags & TH_ACK) {
if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) {
tp->snd_wnd = tiwin;
@@ -5610,10 +8674,10 @@
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);
+ rack_exit_persist(tp, rack, rack->r_ctl.rc_rcvtime);
tp->snd_nxt = tp->snd_max;
/* Make sure we output to start the timer */
- rack->r_wanted_output++;
+ rack->r_wanted_output = 1;
}
/* Do we enter persists? */
if ((rack->rc_in_persist == 0) &&
@@ -5636,66 +8700,10 @@
return (0);
}
/*
- * Process segments with URG.
+ * don't process the URG bit, ignore them drag
+ * along the up.
*/
- 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 */
+ tp->rcv_up = tp->rcv_nxt;
INP_WLOCK_ASSERT(tp->t_inpcb);
/*
@@ -5744,14 +8752,7 @@
}
}
#endif
- if (DELAY_ACK(tp, tlen) || tfo_syn) {
- rack_timer_cancel(tp, rack,
- rack->r_ctl.rc_rcvtime, __LINE__);
- tp->t_flags |= TF_DELACK;
- } else {
- rack->r_wanted_output++;
- tp->t_flags |= TF_ACKNOW;
- }
+ rack_handle_delayed_ack(tp, rack, tlen, tfo_syn);
tp->rcv_nxt += tlen;
thflags = th->th_flags & TH_FIN;
KMOD_TCPSTAT_ADD(tcps_rcvpack, nsegs);
@@ -5782,37 +8783,42 @@
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);
- }
- }
+ 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.
+ */
+ RACK_OPTS_INC(tcp_sack_path_1);
+ 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.
+ */
+ RACK_OPTS_INC(tcp_sack_path_2a);
+ tcp_update_sack_list(tp,
+ tp->sackblks[0].start,
+ tp->sackblks[0].end);
+ } else {
+ RACK_OPTS_INC(tcp_sack_path_2b);
+ tcp_update_dsack_list(tp, save_start,
+ save_start + save_tlen);
+ }
+ } else if (tlen >= save_tlen) {
+ /* Update of sackblks. */
+ RACK_OPTS_INC(tcp_sack_path_3);
+ tcp_update_dsack_list(tp, save_start,
+ save_start + save_tlen);
+ } else if (tlen > 0) {
+ RACK_OPTS_INC(tcp_sack_path_4);
+ tcp_update_dsack_list(tp, save_start,
+ save_start + tlen);
+ }
+ }
} else {
m_freem(m);
thflags &= ~TH_FIN;
@@ -5883,7 +8889,7 @@
*/
if ((tp->t_flags & TF_ACKNOW) ||
(sbavail(&so->so_snd) > (tp->snd_max - tp->snd_una))) {
- rack->r_wanted_output++;
+ rack->r_wanted_output = 1;
}
INP_WLOCK_ASSERT(tp->t_inpcb);
return (0);
@@ -6014,14 +9020,8 @@
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;
- } else {
- tp->t_flags |= TF_ACKNOW;
- rack->r_wanted_output++;
- }
- if ((tp->snd_una == tp->snd_max) && rack_use_sack_filter)
+ rack_handle_delayed_ack(tp, rack, tlen, 0);
+ if (tp->snd_una == tp->snd_max)
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
return (1);
}
@@ -6038,11 +9038,10 @@
static int
rack_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, uint32_t cts, uint8_t iptos)
+ uint32_t tiwin, int32_t nxt_pkt, uint32_t cts)
{
int32_t acked;
int32_t nsegs;
-
#ifdef TCPDEBUG
/*
* The size of tcp_saveipgen must be the size of the max ip header,
@@ -6051,8 +9050,8 @@
u_char tcp_saveipgen[IP6_HDR_LEN];
struct tcphdr tcp_savetcp;
short ostate = 0;
-
#endif
+ int32_t under_pacing = 0;
struct tcp_rack *rack;
if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
@@ -6089,14 +9088,12 @@
return (0);
}
/* Ok if we reach here, we can process a fast-ack */
+ if (rack->rc_gp_filled &&
+ (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
+ under_pacing = 1;
+ }
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;
@@ -6108,7 +9105,7 @@
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);
+ rack_exit_persist(tp, rack, cts);
}
/* Do we enter persists? */
if ((rack->rc_in_persist == 0) &&
@@ -6167,6 +9164,21 @@
KMOD_TCPSTAT_ADD(tcps_rcvackpack, nsegs);
KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
sbdrop(&so->so_snd, acked);
+ if (acked) {
+ /* assure we are not backed off */
+ tp->t_rxtshift = 0;
+ rack->rc_tlp_in_progress = 0;
+ rack->r_ctl.rc_tlp_cnt_out = 0;
+ /*
+ * If it is the RXT timer we want to
+ * stop it, so we can restart a TLP.
+ */
+ if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
+ rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
+#ifdef NETFLIX_HTTP_LOGGING
+ tcp_http_check_for_comp(rack->rc_tp, th->th_ack);
+#endif
+ }
/*
* Let the congestion control algorithm update congestion control
* related information. This typically means increasing the
@@ -6202,7 +9214,18 @@
(void *)tcp_saveipgen,
&tcp_savetcp, 0);
#endif
+ if (under_pacing &&
+ (rack->use_fixed_rate == 0) &&
+ (rack->in_probe_rtt == 0) &&
+ rack->rc_gp_dyn_mul &&
+ rack->rc_always_pace) {
+ /* Check if we are dragging bottom */
+ rack_check_bottom_drag(tp, rack, so, acked);
+ }
if (tp->snd_una == tp->snd_max) {
+ rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
+ if (rack->r_ctl.rc_went_idle_time == 0)
+ rack->r_ctl.rc_went_idle_time = 1;
rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0)
tp->t_acktime = 0;
@@ -6211,7 +9234,7 @@
/* Wake up the socket if we have room to write more */
sowwakeup(so);
if (sbavail(&so->so_snd)) {
- rack->r_wanted_output++;
+ rack->r_wanted_output = 1;
}
return (1);
}
@@ -6224,7 +9247,7 @@
static int
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, uint8_t tos)
+ uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
int32_t todrop;
@@ -6241,11 +9264,12 @@
* contains an ECE and ECN support is enabled, the stream is ECN
* 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
+ * continue processing rest of data/controls.
*/
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->iss) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -6295,15 +9319,7 @@
* 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 && (tfo_partial == 0)) {
- rack_timer_cancel(tp, rack,
- rack->r_ctl.rc_rcvtime, __LINE__);
- tp->t_flags |= TF_DELACK;
- } else {
- rack->r_wanted_output++;
- tp->t_flags |= TF_ACKNOW;
- }
-
+ rack_handle_delayed_ack(tp, rack, tlen, tfo_partial);
if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&
(V_tcp_do_ecn == 1)) {
tp->t_flags2 |= TF2_ECN_PERMIT;
@@ -6337,7 +9353,7 @@
tcp_state_change(tp, TCPS_ESTABLISHED);
TCP_PROBE5(connect__established, NULL, tp,
mtod(m, const char *), tp, th);
- cc_conn_init(tp);
+ rack_cc_conn_init(tp);
}
} else {
/*
@@ -6381,7 +9397,7 @@
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(rack, t + 1, 1, (t * HPTS_USEC_IN_MSEC), 0, NULL, 2);
tcp_rack_xmit_timer_commit(rack, tp);
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val))
@@ -6437,6 +9453,7 @@
if ((thflags & TH_ACK) &&
(SEQ_LEQ(th->th_ack, tp->snd_una) ||
SEQ_GT(th->th_ack, tp->snd_max))) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -6450,6 +9467,7 @@
* FIN, or a RST.
*/
if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
} else if (thflags & TH_SYN) {
@@ -6485,6 +9503,7 @@
* "LAND" DoS attack.
*/
if (SEQ_LT(th->th_seq, tp->irs)) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
}
@@ -6520,7 +9539,7 @@
*/
if ((thflags & TH_ACK) == 0) {
if (IS_FASTOPEN(tp->t_flags)) {
- cc_conn_init(tp);
+ rack_cc_conn_init(tp);
}
return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
tiwin, thflags, nxt_pkt));
@@ -6561,7 +9580,7 @@
* that occurs when a TFO SYN|ACK is retransmitted.
*/
if (!IS_FASTOPEN(tp->t_flags))
- cc_conn_init(tp);
+ rack_cc_conn_init(tp);
}
/*
* If segment contains data or ACK, will call tcp_reass() later; if
@@ -6578,7 +9597,7 @@
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(rack, t + 1, 1, (t * HPTS_USEC_IN_MSEC), 0, NULL, 2);
tcp_rack_xmit_timer_commit(rack, tp);
}
if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
@@ -6626,6 +9645,7 @@
uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
{
int32_t ret_val = 0;
+ struct tcp_rack *rack;
/*
* Header prediction: check for the two common cases of a
@@ -6641,16 +9661,14 @@
* hidden state-flags are also off. Since we check for
* TCPS_ESTABLISHED first, it can only be TH_NEEDSYN.
*/
+ rack = (struct tcp_rack *)tp->t_fb_ptr;
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((thflags & (TH_SYN | TH_FIN | TH_RST | TH_ACK)) == TH_ACK) &&
__predict_true(SEGQ_EMPTY(tp)) &&
__predict_true(th->th_seq == tp->rcv_nxt)) {
- struct tcp_rack *rack;
-
- rack = (struct tcp_rack *)tp->t_fb_ptr;
if (tlen == 0) {
if (rack_fastack(m, th, so, tp, to, drop_hdrlen, tlen,
- tiwin, nxt_pkt, rack->r_ctl.rc_rcvtime, iptos)) {
+ tiwin, nxt_pkt, rack->r_ctl.rc_rcvtime)) {
return (0);
}
} else {
@@ -6720,7 +9738,7 @@
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output= 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
@@ -6734,7 +9752,8 @@
return (ret_val);
}
if (sbavail(&so->so_snd)) {
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
@@ -6814,7 +9833,7 @@
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
@@ -6828,7 +9847,9 @@
return (ret_val);
}
if (sbavail(&so->so_snd)) {
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
+ tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
@@ -6847,6 +9868,9 @@
rack = (struct tcp_rack *)tp->t_fb_ptr;
if (rack->rc_allow_data_af_clo == 0) {
close_now:
+ tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
+ /* tcp_close will kill the inp pre-log the Reset */
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
tp = tcp_close(tp);
KMOD_TCPSTAT_INC(tcps_rcvafterclose);
ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen));
@@ -6855,6 +9879,7 @@
if (sbavail(&so->so_snd) == 0)
goto close_now;
/* Ok we allow data that is ignored and a followup reset */
+ tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
tp->rcv_nxt = th->th_seq + *tlen;
tp->t_flags2 |= TF2_DROP_AF_DATA;
rack->r_wanted_output = 1;
@@ -6940,7 +9965,7 @@
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
@@ -6973,7 +9998,9 @@
tcp_state_change(tp, TCPS_FIN_WAIT_2);
}
if (sbavail(&so->so_snd)) {
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
+ tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
@@ -7061,7 +10088,7 @@
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output= 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
@@ -7080,7 +10107,9 @@
return (1);
}
if (sbavail(&so->so_snd)) {
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
+ tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
@@ -7168,7 +10197,7 @@
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
@@ -7187,7 +10216,9 @@
return (1);
}
if (sbavail(&so->so_snd)) {
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
+ tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
@@ -7278,7 +10309,7 @@
tiwin, thflags, nxt_pkt));
} else if (tp->t_flags & TF_ACKNOW) {
ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
- ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++;
+ ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
return (ret_val);
} else {
ctf_do_drop(m, NULL);
@@ -7292,7 +10323,9 @@
return (ret_val);
}
if (sbavail(&so->so_snd)) {
- if (rack_progress_timeout_check(tp)) {
+ if (ctf_progress_timeout_check(tp, true)) {
+ rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
+ tp, tick, PROGRESS_DROP, __LINE__);
tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return (1);
@@ -7302,7 +10335,6 @@
tiwin, thflags, nxt_pkt));
}
-
static void inline
rack_clear_rate_sample(struct tcp_rack *rack)
{
@@ -7312,25 +10344,91 @@
}
static void
-rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack)
+rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack, uint32_t line)
{
+ uint64_t bw_est, rate_wanted;
uint32_t tls_seg = 0;
+ int chged = 0;
+ uint32_t user_max;
+ user_max = ctf_fixed_maxseg(tp) * rack->rc_user_set_max_segs;
#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);
+ if (tls_seg != rack->r_ctl.rc_pace_min_segs)
+ chged = 1;
rack->r_ctl.rc_pace_min_segs = tls_seg;
} else
#endif
+ {
+ if (ctf_fixed_maxseg(tp) != rack->r_ctl.rc_pace_min_segs)
+ chged = 1;
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)
+ }
+ if (rack->use_fixed_rate || rack->rc_force_max_seg) {
+ if (user_max != rack->r_ctl.rc_pace_max_segs)
+ chged = 1;
+ }
+ if (rack->rc_force_max_seg) {
+ rack->r_ctl.rc_pace_max_segs = user_max;
+ } else if (rack->use_fixed_rate) {
+ bw_est = rack_get_bw(rack);
+ if ((rack->r_ctl.crte == NULL) ||
+ (bw_est != rack->r_ctl.crte->rate)) {
+ rack->r_ctl.rc_pace_max_segs = user_max;
+ } else {
+ /* We are pacing right at the hardware rate */
+ uint32_t segsiz;
+
+ segsiz = min(ctf_fixed_maxseg(tp),
+ rack->r_ctl.rc_pace_min_segs);
+ rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size(
+ bw_est, segsiz, 0,
+ rack->r_ctl.crte, NULL);
+ }
+ } else if (rack->rc_always_pace) {
+ if (rack->r_ctl.gp_bw ||
+#ifdef NETFLIX_PEAKRATE
+ rack->rc_tp->t_maxpeakrate ||
+#endif
+ rack->r_ctl.init_rate) {
+ /* We have a rate of some sort set */
+ uint32_t orig;
+
+ bw_est = rack_get_bw(rack);
+ orig = rack->r_ctl.rc_pace_max_segs;
+ rate_wanted = rack_get_output_bw(rack, bw_est, NULL);
+ if (rate_wanted) {
+ /* We have something */
+ rack->r_ctl.rc_pace_max_segs = rack_get_pacing_len(rack,
+ rate_wanted,
+ ctf_fixed_maxseg(rack->rc_tp));
+ } else
+ rack->r_ctl.rc_pace_max_segs = rack->r_ctl.rc_pace_min_segs;
+ if (orig != rack->r_ctl.rc_pace_max_segs)
+ chged = 1;
+ } else if ((rack->r_ctl.gp_bw == 0) &&
+ (rack->r_ctl.rc_pace_max_segs == 0)) {
+ /*
+ * If we have nothing limit us to bursting
+ * out IW sized pieces.
+ */
+ chged = 1;
+ rack->r_ctl.rc_pace_max_segs = rc_init_window(rack);
+ }
+ }
+ if (rack->r_ctl.rc_pace_max_segs > PACE_MAX_IP_BYTES) {
+ chged = 1;
rack->r_ctl.rc_pace_max_segs = PACE_MAX_IP_BYTES;
+ }
#ifdef KERN_TLS
+ uint32_t orig;
+
if (tls_seg != 0) {
+ orig = rack->r_ctl.rc_pace_max_segs;
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)
+ 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;
@@ -7338,9 +10436,16 @@
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;
+ if (rack->r_ctl.rc_pace_max_segs > PACE_MAX_IP_BYTES) {
+ /* We can't go over the max bytes (usually 64k) */
+ rack->r_ctl.rc_pace_max_segs = ((PACE_MAX_IP_BYTES / tls_seg) * tls_seg);
+ }
+ if (orig != rack->r_ctl.rc_pace_max_segs)
+ chged = 1;
}
#endif
- rack_log_type_hrdwtso(tp, rack, tls_seg, rack->rc_inp->inp_socket->so_snd.sb_flags, 0, 2);
+ if (chged)
+ rack_log_type_hrdwtso(tp, rack, tls_seg, rack->rc_inp->inp_socket->so_snd.sb_flags, line, 2);
}
static int
@@ -7348,6 +10453,7 @@
{
struct tcp_rack *rack = NULL;
struct rack_sendmap *insret;
+ uint32_t iwin, snt, us_cts;
tp->t_fb_ptr = uma_zalloc(rack_pcb_zone, M_NOWAIT);
if (tp->t_fb_ptr == NULL) {
@@ -7369,39 +10475,77 @@
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;
rack->r_ctl.rc_reorder_fade = rack_reorder_fade;
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 (use_rack_rr)
+ rack->use_rack_rr = 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;
+ if (rack_enable_shared_cwnd)
+ rack->rack_enable_scwnd = 1;
+ rack->rc_user_set_max_segs = rack_hptsi_segments;
+ rack->rc_force_max_seg = 0;
+ if (rack_use_imac_dack)
+ rack->rc_dack_mode = 1;
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_enforce_min_pace = rack_min_pace_time;
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->r_ctl.rc_lowest_us_rtt = 0xffffffff;
+ rack->r_ctl.rc_highest_us_rtt = 0;
+ if (rack_disable_prr)
+ rack->rack_no_prr = 1;
+ if (rack_gp_no_rec_chg)
+ rack->rc_gp_no_rec_chg = 1;
rack->rc_always_pace = rack_pace_every_seg;
- rack_set_pace_segments(tp, rack);
+ if (rack_enable_mqueue_for_nonpaced)
+ rack->r_mbuf_queue = 1;
+ else
+ rack->r_mbuf_queue = 0;
+ if (rack->r_mbuf_queue || rack->rc_always_pace)
+ tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ;
+ else
+ tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
+ rack_set_pace_segments(tp, rack, __LINE__);
+ if (rack_limits_scwnd)
+ rack->r_limit_scw = 1;
+ else
+ rack->r_limit_scw = 0;
rack->r_ctl.rc_high_rwnd = tp->snd_wnd;
+ rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
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->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();
+ microuptime(&rack->r_ctl.act_rcv_time);
+ rack->r_ctl.rc_last_time_decay = rack->r_ctl.act_rcv_time;
+ rack->r_running_late = 0;
+ rack->r_running_early = 0;
+ rack->rc_init_win = rack_default_init_window;
+ rack->r_ctl.rack_per_of_gp_ss = rack_per_of_gp_ss;
+ if (rack_do_dyn_mul) {
+ /* When dynamic adjustment is on CA needs to start at 100% */
+ rack->rc_gp_dyn_mul = 1;
+ if (rack_do_dyn_mul >= 100)
+ rack->r_ctl.rack_per_of_gp_ca = rack_do_dyn_mul;
+ } else
+ rack->r_ctl.rack_per_of_gp_ca = rack_per_of_gp_ca;
+ rack->r_ctl.rack_per_of_gp_rec = rack_per_of_gp_rec;
+ rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
+ rack->r_ctl.rc_tlp_rxt_last_time = tcp_tv_to_mssectick(&rack->r_ctl.act_rcv_time);
+ setup_time_filter_small(&rack->r_ctl.rc_gp_min_rtt, FILTER_TYPE_MIN,
+ rack_probertt_filter_life);
+ us_cts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
+ rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
+ rack->r_ctl.rc_time_of_last_probertt = us_cts;
+ rack->r_ctl.rc_time_probertt_starts = 0;
/* Do we force on detection? */
#ifdef NETFLIX_EXP_DETECTION
if (tcp_force_detection)
@@ -7409,6 +10553,8 @@
else
#endif
rack->do_detection = 0;
+ if (rack_non_rxt_use_cr)
+ rack->rack_rec_nonrxt_use_cr = 1;
if (tp->snd_una != tp->snd_max) {
/* Create a send map for the current outstanding data */
struct rack_sendmap *rsm;
@@ -7425,6 +10571,7 @@
rsm->r_rtr_bytes = 0;
rsm->r_start = tp->snd_una;
rsm->r_end = tp->snd_max;
+ rsm->usec_orig_send = us_cts;
rsm->r_dupack = 0;
insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
#ifdef INVARIANTS
@@ -7436,8 +10583,46 @@
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
rsm->r_in_tmap = 1;
}
+ /* Cancel the GP measurement in progress */
+ tp->t_flags &= ~TF_GPUTINPROG;
+ if (SEQ_GT(tp->snd_max, tp->iss))
+ snt = tp->snd_max - tp->iss;
+ else
+ snt = 0;
+ iwin = rc_init_window(rack);
+ if (snt < iwin) {
+ /* We are not past the initial window
+ * so we need to make sure cwnd is
+ * correct.
+ */
+ if (tp->snd_cwnd < iwin)
+ tp->snd_cwnd = iwin;
+ /*
+ * If we are within the initial window
+ * we want ssthresh to be unlimited. Setting
+ * it to the rwnd (which the default stack does
+ * and older racks) is not really a good idea
+ * since we want to be in SS and grow both the
+ * cwnd and the rwnd (via dynamic rwnd growth). If
+ * we set it to the rwnd then as the peer grows its
+ * rwnd we will be stuck in CA and never hit SS.
+ *
+ * Its far better to raise it up high (this takes the
+ * risk that there as been a loss already, probably
+ * we should have an indicator in all stacks of loss
+ * but we don't), but considering the normal use this
+ * is a risk worth taking. The consequences of not
+ * hitting SS are far worse than going one more time
+ * into it early on (before we have sent even a IW).
+ * It is highly unlikely that we will have had a loss
+ * before getting the IW out.
+ */
+ tp->snd_ssthresh = 0xffffffff;
+ }
rack_stop_all_timers(tp);
rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0);
+ rack_log_rtt_shrinks(rack, us_cts, 0,
+ __LINE__, RACK_RTTS_INIT);
return (0);
}
@@ -7473,11 +10658,29 @@
if (tp->t_fb_ptr) {
struct tcp_rack *rack;
struct rack_sendmap *rsm, *nrsm, *rm;
+
+ rack = (struct tcp_rack *)tp->t_fb_ptr;
+#ifdef NETFLIX_SHARED_CWND
+ if (rack->r_ctl.rc_scw) {
+ uint32_t limit;
+
+ if (rack->r_limit_scw)
+ limit = max(1, rack->r_ctl.rc_lowest_us_rtt);
+ else
+ limit = 0;
+ tcp_shared_cwnd_free_full(tp, rack->r_ctl.rc_scw,
+ rack->r_ctl.rc_scw_index,
+ limit);
+ rack->r_ctl.rc_scw = NULL;
+ }
+#endif
+ /* rack does not use force data but other stacks may clear it */
+ tp->t_flags &= ~TF_FORCEDATA;
if (tp->t_inpcb) {
tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
+ tp->t_inpcb->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
}
- rack = (struct tcp_rack *)tp->t_fb_ptr;
#ifdef TCP_BLACKBOX
tcp_log_flowend(tp);
#endif
@@ -7501,6 +10704,8 @@
uma_zfree(rack_pcb_zone, tp->t_fb_ptr);
tp->t_fb_ptr = NULL;
}
+ /* Cancel the GP measurement in progress */
+ tp->t_flags &= ~TF_GPUTINPROG;
/* Make sure snd_nxt is correctly set */
tp->snd_nxt = tp->snd_max;
}
@@ -7519,7 +10724,7 @@
rack->r_substate = rack_do_syn_recv;
break;
case TCPS_ESTABLISHED:
- rack_set_pace_segments(tp, rack);
+ rack_set_pace_segments(tp, rack, __LINE__);
rack->r_state = TCPS_ESTABLISHED;
rack->r_substate = rack_do_established;
break;
@@ -7618,6 +10823,19 @@
* We will force the hpts to be stopped if any, and restart
* with the slot set to what was in the saved slot.
*/
+ if (rack->rc_inp->inp_in_hpts) {
+ if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
+ uint32_t us_cts;
+
+ us_cts = tcp_get_usecs(NULL);
+ if (TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
+ rack->r_early = 1;
+ rack->r_ctl.rc_agg_early += (rack->r_ctl.rc_last_output_to - us_cts);
+ }
+ rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
+ }
+ tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_OUTPUT);
+ }
rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0);
}
@@ -7631,18 +10849,31 @@
int32_t way_out = 0;
uint32_t cts;
uint32_t tiwin;
+ struct timespec ts;
struct tcpopt to;
struct tcp_rack *rack;
struct rack_sendmap *rsm;
int32_t prev_state = 0;
+ uint32_t us_cts;
+ /*
+ * tv passed from common code is from either M_TSTMP_LRO or
+ * tcp_get_usecs() if no LRO m_pkthdr timestamp is present. The
+ * rack_pacing stack assumes tv always refers to 'now', so we overwrite
+ * tv here to guarantee that.
+ */
+ if (m->m_flags & M_TSTMP_LRO)
+ 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;
- }
cts = tcp_tv_to_mssectick(tv);
rack = (struct tcp_rack *)tp->t_fb_ptr;
+ if ((m->m_flags & M_TSTMP) ||
+ (m->m_flags & M_TSTMP_LRO)) {
+ mbuf_tstmp2timespec(m, &ts);
+ rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
+ rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
+ } else
+ rack->r_ctl.act_rcv_time = *tv;
kern_prefetch(rack, &prev_state);
prev_state = 0;
thflags = th->th_flags;
@@ -7655,18 +10886,73 @@
__func__));
if (tp->t_logstate != TCP_LOG_STATE_OFF) {
union tcp_log_stackspecific log;
- struct timeval tv;
+ struct timeval ltv;
+#ifdef NETFLIX_HTTP_LOGGING
+ struct http_sendfile_track *http_req;
+ if (SEQ_GT(th->th_ack, tp->snd_una)) {
+ http_req = tcp_http_find_req_for_seq(tp, (th->th_ack-1));
+ } else {
+ http_req = tcp_http_find_req_for_seq(tp, th->th_ack);
+ }
+#endif
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;
+ if (rack->rack_no_prr == 0)
+ log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
+ else
+ log.u_bbr.flex1 = 0;
log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced;
- 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;
+ log.u_bbr.flex3 = m->m_flags;
+ log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
+ if (m->m_flags & M_TSTMP) {
+ /* Record the hardware timestamp if present */
+ mbuf_tstmp2timespec(m, &ts);
+ ltv.tv_sec = ts.tv_sec;
+ ltv.tv_usec = ts.tv_nsec / 1000;
+ log.u_bbr.lt_epoch = tcp_tv_to_usectick(&ltv);
+ } else if (m->m_flags & M_TSTMP_LRO) {
+ /* Record the LRO the arrival timestamp */
+ mbuf_tstmp2timespec(m, &ts);
+ ltv.tv_sec = ts.tv_sec;
+ ltv.tv_usec = ts.tv_nsec / 1000;
+ log.u_bbr.flex5 = tcp_tv_to_usectick(&ltv);
+ }
+ log.u_bbr.timeStamp = tcp_get_usecs(&ltv);
+ /* Log the rcv time */
+ log.u_bbr.delRate = m->m_pkthdr.rcv_tstmp;
+#ifdef NETFLIX_HTTP_LOGGING
+ log.u_bbr.applimited = tp->t_http_closed;
+ log.u_bbr.applimited <<= 8;
+ log.u_bbr.applimited |= tp->t_http_open;
+ log.u_bbr.applimited <<= 8;
+ log.u_bbr.applimited |= tp->t_http_req;
+ if (http_req) {
+ /* Copy out any client req info */
+ /* seconds */
+ log.u_bbr.pkt_epoch = (http_req->localtime / HPTS_USEC_IN_SEC);
+ /* useconds */
+ log.u_bbr.delivered = (http_req->localtime % HPTS_USEC_IN_SEC);
+ log.u_bbr.rttProp = http_req->timestamp;
+ log.u_bbr.cur_del_rate = http_req->start;
+ if (http_req->flags & TCP_HTTP_TRACK_FLG_OPEN) {
+ log.u_bbr.flex8 |= 1;
+ } else {
+ log.u_bbr.flex8 |= 2;
+ log.u_bbr.bw_inuse = http_req->end;
+ }
+ log.u_bbr.flex6 = http_req->start_seq;
+ if (http_req->flags & TCP_HTTP_TRACK_FLG_COMP) {
+ log.u_bbr.flex8 |= 4;
+ log.u_bbr.epoch = http_req->end_seq;
+ }
+ }
+#endif
TCP_LOG_EVENTP(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0,
- tlen, &log, true, &tv);
+ tlen, &log, true, &ltv);
}
if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {
way_out = 4;
@@ -7679,6 +10965,7 @@
*/
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))) {
+ tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
return(1);
}
@@ -7691,10 +10978,9 @@
(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_cc_after_idle(rack, tp);
}
tp->t_rcvtime = ticks;
-
/*
* Unscale the window into a 32-bit value. For the SYN_SENT state
* the scale is zero.
@@ -7752,6 +11038,7 @@
if (TSTMP_GT(to.to_tsecr, cts))
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!
@@ -7771,7 +11058,6 @@
* <SYN> or <SYN,ACK>) segment itself is never scaled. XXX
* this is traditional behavior, may need to be cleaned up.
*/
- rack->r_cpu = inp_to_cpuid(tp->t_inpcb);
if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {
if ((to.to_flags & TOF_SCALE) &&
(tp->t_flags & TF_REQ_SCALE)) {
@@ -7813,10 +11099,14 @@
/*
* 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.
+ * TF_SACK_PERMIT is set and the sack-not-required is clear.
+ * The code now does do dup-ack counting so if you don't
+ * switch back you won't get rack & TLP, but you will still
+ * get this stack.
*/
- if ((tp->t_flags & TF_SACK_PERMIT) == 0) {
+
+ if ((rack_sack_not_required == 0) &&
+ ((tp->t_flags & TF_SACK_PERMIT) == 0)) {
tcp_switch_back_to_default(tp);
(*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen,
tlen, iptos);
@@ -7827,12 +11117,38 @@
tcp_set_hpts(tp->t_inpcb);
sack_filter_clear(&rack->r_ctl.rack_sf, th->th_ack);
}
+ if (thflags & TH_FIN)
+ tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_FIN);
+ us_cts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
+ if ((rack->rc_gp_dyn_mul) &&
+ (rack->use_fixed_rate == 0) &&
+ (rack->rc_always_pace)) {
+ /* Check in on probertt */
+ rack_check_probe_rtt(rack, us_cts);
+ }
+ if (rack->forced_ack) {
+ uint32_t us_rtt;
+
+ /*
+ * A persist or keep-alive was forced out, update our
+ * min rtt time. Note we do not worry about lost
+ * retransmissions since KEEP-ALIVES and persists
+ * are usually way long on times of sending (though
+ * if we were really paranoid or worried we could
+ * at least use timestamps if available to validate).
+ */
+ rack->forced_ack = 0;
+ us_rtt = us_cts - rack->r_ctl.forced_ack_ts;
+ if (us_rtt == 0)
+ us_rtt = 1;
+ rack_log_rtt_upd(tp, rack, us_rtt, 0, NULL, 3);
+ rack_apply_updated_usrtt(rack, us_rtt, us_cts);
+ }
/*
* 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).
*/
- 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);
@@ -7840,7 +11156,6 @@
(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;
rack_clear_rate_sample(rack);
retval = (*rack->r_substate) (m, th, so,
tp, &to, drop_hdrlen,
@@ -7858,17 +11173,29 @@
* is gone.
*/
INP_WLOCK_ASSERT(tp->t_inpcb);
+ if ((rack->rc_gp_dyn_mul) &&
+ (rack->rc_always_pace) &&
+ (rack->use_fixed_rate == 0) &&
+ rack->in_probe_rtt &&
+ (rack->r_ctl.rc_time_probertt_starts == 0)) {
+ /*
+ * If we are going for target, lets recheck before
+ * we output.
+ */
+ rack_check_probe_rtt(rack, us_cts);
+ }
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);
+ rack_set_pace_segments(tp, rack, __LINE__);
}
}
tcp_rack_xmit_timer_commit(rack, tp);
- if ((nxt_pkt == 0) || (IN_RECOVERY(tp->t_flags))) {
+ if (nxt_pkt == 0) {
if (rack->r_wanted_output != 0) {
+do_output_now:
did_out = 1;
(void)tp->t_fb->tfb_tcp_output(tp);
}
@@ -7888,10 +11215,27 @@
/* keep alive not needed if we are hptsi output yet */
;
} else {
+ int late = 0;
if (rack->rc_inp->inp_in_hpts) {
- tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT);
- counter_u64_add(rack_per_timer_hole, 1);
+ if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
+ us_cts = tcp_get_usecs(NULL);
+ if (TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
+ rack->r_early = 1;
+ rack->r_ctl.rc_agg_early += (rack->r_ctl.rc_last_output_to - us_cts);
+ } else
+ late = 1;
+ rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
+ }
+ tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_OUTPUT);
}
+ if (late && (did_out == 0)) {
+ /*
+ * We are late in the sending
+ * and we did not call the output
+ * (this probably should not happen).
+ */
+ goto do_output_now;
+ }
rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0);
}
way_out = 1;
@@ -8002,13 +11346,169 @@
return (NULL);
}
+static void
+rack_log_pacing_delay_calc(struct tcp_rack *rack, uint32_t len, uint32_t slot,
+ uint64_t bw_est, uint64_t bw, uint64_t len_time, int method,
+ int line, struct rack_sendmap *rsm)
+{
+ 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 = slot;
+ log.u_bbr.flex2 = len;
+ log.u_bbr.flex3 = rack->r_ctl.rc_pace_min_segs;
+ log.u_bbr.flex4 = rack->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex5 = rack->r_ctl.rack_per_of_gp_ss;
+ log.u_bbr.flex6 = rack->r_ctl.rack_per_of_gp_ca;
+ log.u_bbr.use_lt_bw = rack->app_limited_needs_set;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw = rack->rc_gp_filled;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->measure_saw_probe_rtt;
+ log.u_bbr.use_lt_bw <<= 1;
+ log.u_bbr.use_lt_bw |= rack->in_probe_rtt;
+ log.u_bbr.pkt_epoch = line;
+ log.u_bbr.applimited = rack->r_ctl.rack_per_of_gp_rec;
+ log.u_bbr.bw_inuse = bw_est;
+ log.u_bbr.delRate = bw;
+ if (rack->r_ctl.gp_bw == 0)
+ log.u_bbr.cur_del_rate = 0;
+ else
+ log.u_bbr.cur_del_rate = rack_get_bw(rack);
+ log.u_bbr.rttProp = len_time;
+ log.u_bbr.pkts_out = rack->r_ctl.rc_rack_min_rtt;
+ log.u_bbr.lost = rack->r_ctl.rc_probertt_sndmax_atexit;
+ log.u_bbr.pacing_gain = rack_get_output_gain(rack, rsm);
+ if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh) {
+ /* We are in slow start */
+ log.u_bbr.flex7 = 1;
+ } else {
+ /* we are on congestion avoidance */
+ log.u_bbr.flex7 = 0;
+ }
+ log.u_bbr.flex8 = method;
+ 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.cwnd_gain = rack->rc_gp_saw_rec;
+ log.u_bbr.cwnd_gain <<= 1;
+ log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ss;
+ log.u_bbr.cwnd_gain <<= 1;
+ log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ca;
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ BBR_LOG_HPTSI_CALC, 0,
+ 0, &log, false, &tv);
+ }
+}
+
+static uint32_t
+rack_get_pacing_len(struct tcp_rack *rack, uint64_t bw, uint32_t mss)
+{
+ uint32_t new_tso, user_max;
+
+ user_max = rack->rc_user_set_max_segs * mss;
+ if (rack->rc_force_max_seg) {
+ return (user_max);
+ }
+ if (rack->use_fixed_rate &&
+ ((rack->r_ctl.crte == NULL) ||
+ (bw != rack->r_ctl.crte->rate))) {
+ /* Use the user mss since we are not exactly matched */
+ return (user_max);
+ }
+ new_tso = tcp_get_pacing_burst_size(bw, mss, rack_pace_one_seg, rack->r_ctl.crte, NULL);
+ if (new_tso > user_max)
+ new_tso = user_max;
+ return(new_tso);
+}
+
+static void
+rack_log_hdwr_pacing(struct tcp_rack *rack, const struct ifnet *ifp,
+ uint64_t rate, uint64_t hw_rate, int line,
+ int error)
+{
+ 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 = ((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.timeStamp = tcp_get_usecs(&tv);
+ log.u_bbr.bw_inuse = rate;
+ log.u_bbr.flex5 = line;
+ log.u_bbr.flex6 = error;
+ log.u_bbr.applimited = rack->r_ctl.rc_pace_max_segs;
+ log.u_bbr.flex8 = rack->use_fixed_rate;
+ log.u_bbr.flex8 <<= 1;
+ log.u_bbr.flex8 |= rack->rack_hdrw_pacing;
+ log.u_bbr.pkts_out = rack->rc_tp->t_maxseg;
+ TCP_LOG_EVENTP(rack->rc_tp, NULL,
+ &rack->rc_inp->inp_socket->so_rcv,
+ &rack->rc_inp->inp_socket->so_snd,
+ BBR_LOG_HDWR_PACE, 0,
+ 0, &log, false, &tv);
+ }
+}
+
static int32_t
-rack_get_pacing_delay(struct tcp_rack *rack, struct tcpcb *tp, uint32_t len)
+pace_to_fill_cwnd(struct tcp_rack *rack, int32_t slot, uint32_t len, uint32_t segsiz)
{
+ uint64_t lentim, fill_bw;
+
+ /* Lets first see if we are full, if so continue with normal rate */
+ if (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) > rack->r_ctl.cwnd_to_use)
+ return (slot);
+ if ((ctf_outstanding(rack->rc_tp) + (segsiz-1)) > rack->rc_tp->snd_wnd)
+ return (slot);
+ if (rack->r_ctl.rc_last_us_rtt == 0)
+ return (slot);
+ if (rack->rc_pace_fill_if_rttin_range &&
+ (rack->r_ctl.rc_last_us_rtt >=
+ (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack->rtt_limit_mul))) {
+ /* The rtt is huge, N * smallest, lets not fill */
+ return (slot);
+ }
+ /*
+ * first lets calculate the b/w based on the last us-rtt
+ * and the sndwnd.
+ */
+ fill_bw = rack->r_ctl.cwnd_to_use;
+ /* Take the rwnd if its smaller */
+ if (fill_bw > rack->rc_tp->snd_wnd)
+ fill_bw = rack->rc_tp->snd_wnd;
+ fill_bw *= (uint64_t)HPTS_USEC_IN_SEC;
+ fill_bw /= (uint64_t)rack->r_ctl.rc_last_us_rtt;
+ /* We are below the min b/w */
+ if (fill_bw < RACK_MIN_BW)
+ return (slot);
+ /*
+ * Ok fill_bw holds our mythical b/w to fill the cwnd
+ * in a rtt, what does that time wise equate too?
+ */
+ lentim = (uint64_t)(len) * (uint64_t)HPTS_USEC_IN_SEC;
+ lentim /= fill_bw;
+ if (lentim < slot) {
+ rack_log_pacing_delay_calc(rack, len, slot, fill_bw,
+ 0, lentim, 12, __LINE__, NULL);
+ return ((int32_t)lentim);
+ } else
+ return (slot);
+}
+
+static int32_t
+rack_get_pacing_delay(struct tcp_rack *rack, struct tcpcb *tp, uint32_t len, struct rack_sendmap *rsm, uint32_t segsiz)
+{
+ struct rack_sendmap *lrsm;
int32_t slot = 0;
+ int err;
- if ((rack->rack_per_of_gp == 0) ||
- (rack->rc_always_pace == 0)) {
+ if (rack->rc_always_pace == 0) {
/*
* We use the most optimistic possible cwnd/srtt for
* sending calculations. This will make our
@@ -8017,8 +11517,17 @@
* the peer to have a gap in data sending.
*/
uint32_t srtt, cwnd, tr_perms = 0;
+ int32_t reduce = 0;
-old_method:
+ old_method:
+ /*
+ * We keep no precise pacing with the old method
+ * instead we use the pacer to mitigate bursts.
+ */
+ rack->r_ctl.rc_agg_delayed = 0;
+ rack->r_early = 0;
+ rack->r_late = 0;
+ rack->r_ctl.rc_agg_early = 0;
if (rack->r_ctl.rc_rack_min_rtt)
srtt = rack->r_ctl.rc_rack_min_rtt;
else
@@ -8026,7 +11535,7 @@
if (rack->r_ctl.rc_rack_largest_cwnd)
cwnd = rack->r_ctl.rc_rack_largest_cwnd;
else
- cwnd = tp->snd_cwnd;
+ cwnd = rack->r_ctl.cwnd_to_use;
tr_perms = cwnd / srtt;
if (tr_perms == 0) {
tr_perms = ctf_fixed_maxseg(tp);
@@ -8042,56 +11551,172 @@
*/
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 (slot && rack_slot_reduction) {
+ reduce = (slot / rack_slot_reduction);
if (reduce < slot) {
slot -= reduce;
} else
slot = 0;
}
+ slot *= HPTS_USEC_IN_MSEC;
+ if (rsm == NULL) {
+ /*
+ * We always consider ourselves app limited with old style
+ * that are not retransmits. This could be the initial
+ * measurement, but thats ok its all setup and specially
+ * handled. If another send leaks out, then that too will
+ * be mark app-limited.
+ */
+ lrsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if (lrsm && ((lrsm->r_flags & RACK_APP_LIMITED) == 0)) {
+ rack->r_ctl.rc_first_appl = lrsm;
+ lrsm->r_flags |= RACK_APP_LIMITED;
+ rack->r_ctl.rc_app_limited_cnt++;
+ }
+ }
+ rack_log_pacing_delay_calc(rack, len, slot, tr_perms, reduce, 0, 7, __LINE__, NULL);
} else {
- int cnt;
- uint64_t bw_est, bw_raise, res, lentim;
+ uint64_t bw_est, res, lentim, rate_wanted;
+ uint32_t orig_val, srtt, segs, oh;
- 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 ((rack->r_rr_config == 1) && rsm) {
+ return (rack->r_ctl.rc_min_to * HPTS_USEC_IN_MSEC);
}
- if (bw_est == 0) {
+ if (rack->use_fixed_rate) {
+ rate_wanted = bw_est = rack_get_fixed_pacing_bw(rack);
+ } else if ((rack->r_ctl.init_rate == 0) &&
+#ifdef NETFLIX_PEAKRATE
+ (rack->rc_tp->t_maxpeakrate == 0) &&
+#endif
+ (rack->r_ctl.gp_bw == 0)) {
+ /* no way to yet do an estimate */
+ bw_est = rate_wanted = 0;
+ } else {
+ bw_est = rack_get_bw(rack);
+ rate_wanted = rack_get_output_bw(rack, bw_est, rsm);
+ }
+ if ((bw_est == 0) || (rate_wanted == 0)) {
/*
- * No way yet to make a b/w estimate
- * (no goodput est yet).
+ * No way yet to make a b/w estimate or
+ * our raise is set incorrectly.
*/
goto old_method;
}
- /* Covert to bytes per second */
- bw_est *= MSEC_IN_SECOND;
+ /* We need to account for all the overheads */
+ segs = (len + segsiz - 1) / segsiz;
/*
- * 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.
+ * We need the diff between 1514 bytes (e-mtu with e-hdr)
+ * and how much data we put in each packet. Yes this
+ * means we may be off if we are larger than 1500 bytes
+ * or smaller. But this just makes us more conservative.
*/
- 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;
+ if (ETHERNET_SEGMENT_SIZE > segsiz)
+ oh = ETHERNET_SEGMENT_SIZE - segsiz;
+ else
+ oh = 0;
+ segs *= oh;
+ lentim = (uint64_t)(len + segs) * (uint64_t)HPTS_USEC_IN_SEC;
+ res = lentim / rate_wanted;
slot = (uint32_t)res;
+ orig_val = rack->r_ctl.rc_pace_max_segs;
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+#ifdef KERN_TLS
+ /* For TLS we need to override this, possibly */
+ if (rack->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) {
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+ }
+#endif
+ /* Did we change the TSO size, if so log it */
+ if (rack->r_ctl.rc_pace_max_segs != orig_val)
+ rack_log_pacing_delay_calc(rack, len, slot, orig_val, 0, 0, 15, __LINE__, NULL);
+ if ((rack->rc_pace_to_cwnd) &&
+ (rack->in_probe_rtt == 0) &&
+ (IN_RECOVERY(rack->rc_tp->t_flags) == 0)) {
+ /*
+ * We want to pace at our rate *or* faster to
+ * fill the cwnd to the max if its not full.
+ */
+ slot = pace_to_fill_cwnd(rack, slot, (len+segs), segsiz);
+ }
+ if ((rack->rc_inp->inp_route.ro_nh != NULL) &&
+ (rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
+ if ((rack->rack_hdw_pace_ena) &&
+ (rack->rack_hdrw_pacing == 0) &&
+ (rack->rack_attempt_hdwr_pace == 0)) {
+ /*
+ * Lets attempt to turn on hardware pacing
+ * if we can.
+ */
+ rack->rack_attempt_hdwr_pace = 1;
+ rack->r_ctl.crte = tcp_set_pacing_rate(rack->rc_tp,
+ rack->rc_inp->inp_route.ro_nh->nh_ifp,
+ rate_wanted,
+ RS_PACING_GEQ,
+ &err);
+ if (rack->r_ctl.crte) {
+ rack->rack_hdrw_pacing = 1;
+ rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size(rate_wanted, segsiz,
+ 0, rack->r_ctl.crte,
+ NULL);
+ rack_log_hdwr_pacing(rack, rack->rc_inp->inp_route.ro_nh->nh_ifp,
+ rate_wanted, rack->r_ctl.crte->rate, __LINE__,
+ err);
+ }
+ } else if (rack->rack_hdrw_pacing &&
+ (rack->r_ctl.crte->rate != rate_wanted)) {
+ /* Do we need to adjust our rate? */
+ const struct tcp_hwrate_limit_table *nrte;
+
+ nrte = tcp_chg_pacing_rate(rack->r_ctl.crte,
+ rack->rc_tp,
+ rack->rc_inp->inp_route.ro_nh->nh_ifp,
+ rate_wanted,
+ RS_PACING_GEQ,
+ &err);
+ if (nrte == NULL) {
+ /* Lost the rate */
+ rack->rack_hdrw_pacing = 0;
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+ } else if (nrte != rack->r_ctl.crte) {
+ rack->r_ctl.crte = nrte;
+ rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size(rate_wanted,
+ segsiz, 0,
+ rack->r_ctl.crte,
+ NULL);
+ rack_log_hdwr_pacing(rack, rack->rc_inp->inp_route.ro_nh->nh_ifp,
+ rate_wanted, rack->r_ctl.crte->rate, __LINE__,
+ err);
+ }
+
+ }
+ }
+ if (rack_limit_time_with_srtt &&
+ (rack->use_fixed_rate == 0) &&
+#ifdef NETFLIX_PEAKRATE
+ (rack->rc_tp->t_maxpeakrate == 0) &&
+#endif
+ (rack->rack_hdrw_pacing == 0)) {
+ /*
+ * Sanity check, we do not allow the pacing delay
+ * to be longer than the SRTT of the path. If it is
+ * a slow path, then adding a packet should increase
+ * the RTT and compensate for this i.e. the srtt will
+ * be greater so the allowed pacing time will be greater.
+ *
+ * Note this restriction is not for where a peak rate
+ * is set, we are doing fixed pacing or hardware pacing.
+ */
+ if (rack->rc_tp->t_srtt)
+ srtt = (TICKS_2_USEC(rack->rc_tp->t_srtt) >> TCP_RTT_SHIFT);
+ else
+ srtt = RACK_INITIAL_RTO * HPTS_USEC_IN_MSEC; /* its in ms convert */
+ if (srtt < slot) {
+ rack_log_pacing_delay_calc(rack, srtt, slot, rate_wanted, bw_est, lentim, 99, __LINE__, NULL);
+ slot = srtt;
+ }
+ }
+ rack_log_pacing_delay_calc(rack, len, slot, rate_wanted, bw_est, lentim, 2, __LINE__, rsm);
}
- 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
@@ -8099,18 +11724,234 @@
return (slot);
}
+static void
+rack_start_gp_measurement(struct tcpcb *tp, struct tcp_rack *rack,
+ tcp_seq startseq, uint32_t sb_offset)
+{
+ struct rack_sendmap *my_rsm = NULL;
+ struct rack_sendmap fe;
+
+ tp->t_flags |= TF_GPUTINPROG;
+ rack->r_ctl.rc_gp_lowrtt = 0xffffffff;
+ rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
+ tp->gput_seq = startseq;
+ rack->app_limited_needs_set = 0;
+ if (rack->in_probe_rtt)
+ rack->measure_saw_probe_rtt = 1;
+ else if ((rack->measure_saw_probe_rtt) &&
+ (SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
+ rack->measure_saw_probe_rtt = 0;
+ if (rack->rc_gp_filled)
+ tp->gput_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
+ else {
+ /* Special case initial measurement */
+ rack->r_ctl.rc_gp_output_ts = tp->gput_ts = tcp_get_usecs(NULL);
+ }
+ /*
+ * We take a guess out into the future,
+ * if we have no measurement and no
+ * initial rate, we measure the first
+ * initial-windows worth of data to
+ * speed up getting some GP measurement and
+ * thus start pacing.
+ */
+ if ((rack->rc_gp_filled == 0) && (rack->r_ctl.init_rate == 0)) {
+ rack->app_limited_needs_set = 1;
+ tp->gput_ack = startseq + max(rc_init_window(rack),
+ (MIN_GP_WIN * ctf_fixed_maxseg(tp)));
+ rack_log_pacing_delay_calc(rack,
+ tp->gput_seq,
+ tp->gput_ack,
+ 0,
+ tp->gput_ts,
+ rack->r_ctl.rc_app_limited_cnt,
+ 9,
+ __LINE__, NULL);
+ return;
+ }
+ if (sb_offset) {
+ /*
+ * We are out somewhere in the sb
+ * can we use the already outstanding data?
+ */
+
+ if (rack->r_ctl.rc_app_limited_cnt == 0) {
+ /*
+ * Yes first one is good and in this case
+ * the tp->gput_ts is correctly set based on
+ * the last ack that arrived (no need to
+ * set things up when an ack comes in).
+ */
+ my_rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if ((my_rsm == NULL) ||
+ (my_rsm->r_rtr_cnt != 1)) {
+ /* retransmission? */
+ goto use_latest;
+ }
+ } else {
+ if (rack->r_ctl.rc_first_appl == NULL) {
+ /*
+ * If rc_first_appl is NULL
+ * then the cnt should be 0.
+ * This is probably an error, maybe
+ * a KASSERT would be approprate.
+ */
+ goto use_latest;
+ }
+ /*
+ * If we have a marker pointer to the last one that is
+ * app limited we can use that, but we need to set
+ * things up so that when it gets ack'ed we record
+ * the ack time (if its not already acked).
+ */
+ rack->app_limited_needs_set = 1;
+ /*
+ * We want to get to the rsm that is either
+ * next with space i.e. over 1 MSS or the one
+ * after that (after the app-limited).
+ */
+ my_rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree,
+ rack->r_ctl.rc_first_appl);
+ if (my_rsm) {
+ if ((my_rsm->r_end - my_rsm->r_start) <= ctf_fixed_maxseg(tp))
+ /* Have to use the next one */
+ my_rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree,
+ my_rsm);
+ else {
+ /* Use after the first MSS of it is acked */
+ tp->gput_seq = my_rsm->r_start + ctf_fixed_maxseg(tp);
+ goto start_set;
+ }
+ }
+ if ((my_rsm == NULL) ||
+ (my_rsm->r_rtr_cnt != 1)) {
+ /*
+ * Either its a retransmit or
+ * the last is the app-limited one.
+ */
+ goto use_latest;
+ }
+ }
+ tp->gput_seq = my_rsm->r_start;
+start_set:
+ if (my_rsm->r_flags & RACK_ACKED) {
+ /*
+ * This one has been acked use the arrival ack time
+ */
+ tp->gput_ts = my_rsm->r_ack_arrival;
+ rack->app_limited_needs_set = 0;
+ }
+ rack->r_ctl.rc_gp_output_ts = my_rsm->usec_orig_send;
+ tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
+ rack_log_pacing_delay_calc(rack,
+ tp->gput_seq,
+ tp->gput_ack,
+ (uint64_t)my_rsm,
+ tp->gput_ts,
+ rack->r_ctl.rc_app_limited_cnt,
+ 9,
+ __LINE__, NULL);
+ return;
+ }
+
+use_latest:
+ /*
+ * We don't know how long we may have been
+ * idle or if this is the first-send. Lets
+ * setup the flag so we will trim off
+ * the first ack'd data so we get a true
+ * measurement.
+ */
+ rack->app_limited_needs_set = 1;
+ tp->gput_ack = startseq + rack_get_measure_window(tp, rack);
+ /* Find this guy so we can pull the send time */
+ fe.r_start = startseq;
+ my_rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
+ if (my_rsm) {
+ rack->r_ctl.rc_gp_output_ts = my_rsm->usec_orig_send;
+ if (my_rsm->r_flags & RACK_ACKED) {
+ /*
+ * Unlikely since its probably what was
+ * just transmitted (but I am paranoid).
+ */
+ tp->gput_ts = my_rsm->r_ack_arrival;
+ rack->app_limited_needs_set = 0;
+ }
+ if (SEQ_LT(my_rsm->r_start, tp->gput_seq)) {
+ /* This also is unlikely */
+ tp->gput_seq = my_rsm->r_start;
+ }
+ } else {
+ /*
+ * TSNH unless we have some send-map limit,
+ * and even at that it should not be hitting
+ * that limit (we should have stopped sending).
+ */
+ rack->r_ctl.rc_gp_output_ts = tcp_get_usecs(NULL);
+ }
+ rack_log_pacing_delay_calc(rack,
+ tp->gput_seq,
+ tp->gput_ack,
+ (uint64_t)my_rsm,
+ tp->gput_ts,
+ rack->r_ctl.rc_app_limited_cnt,
+ 9, __LINE__, NULL);
+}
+
+static inline uint32_t
+rack_what_can_we_send(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cwnd_to_use,
+ uint32_t avail, int32_t sb_offset)
+{
+ uint32_t len;
+ uint32_t sendwin;
+
+ if (tp->snd_wnd > cwnd_to_use)
+ sendwin = cwnd_to_use;
+ else
+ sendwin = tp->snd_wnd;
+ 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, rack->r_ctl.rc_sacked);
+ 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 int
rack_output(struct tcpcb *tp)
{
struct socket *so;
- uint32_t recwin, sendwin;
+ uint32_t recwin;
uint32_t sb_offset;
int32_t len, flags, error = 0;
struct mbuf *m;
struct mbuf *mb;
uint32_t if_hw_tsomaxsegcount = 0;
- uint32_t if_hw_tsomaxsegsize = 0;
- int32_t maxseg;
+ uint32_t if_hw_tsomaxsegsize;
+ int32_t segsiz, minseg;
long tot_len_this_send = 0;
struct ip *ip = NULL;
#ifdef TCPDEBUG
@@ -8120,6 +11961,7 @@
struct tcp_rack *rack;
struct tcphdr *th;
uint8_t pass = 0;
+ uint8_t mark = 0;
uint8_t wanted_cookie = 0;
u_char opt[TCP_MAXOLEN];
unsigned ipoptlen, optlen, hdrlen, ulen=0;
@@ -8137,12 +11979,14 @@
struct tcpopt to;
int32_t slot = 0;
int32_t sup_rack = 0;
- uint32_t cts;
+ uint32_t cts, us_cts, delayed, early;
uint8_t hpts_calling, new_data_tlp = 0, doing_tlp = 0;
+ uint32_t cwnd_to_use;
int32_t do_a_prefetch;
int32_t prefetch_rsm = 0;
int force_tso = 0;
int32_t orig_len;
+ struct timeval tv;
int32_t prefetch_so_done = 0;
struct tcp_log_buffer *lgb = NULL;
struct inpcb *inp;
@@ -8161,19 +12005,16 @@
sb = &so->so_snd;
kern_prefetch(sb, &do_a_prefetch);
do_a_prefetch = 1;
-
+ hpts_calling = inp->inp_hpts_calls;
#ifdef KERN_TLS
hw_tls = (so->so_snd.sb_flags & SB_TLS_IFNET) != 0;
#endif
- NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
-
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE)
return (tcp_offload_output(tp));
#endif
- maxseg = ctf_fixed_maxseg(tp);
/*
* For TFO connections in SYN_RECEIVED, only allow the initial
* SYN|ACK and those sent by the retransmit timer.
@@ -8191,7 +12032,9 @@
isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
}
#endif
- cts = tcp_ts_getticks();
+ early = 0;
+ us_cts = tcp_get_usecs(&tv);
+ cts = tcp_tv_to_mssectick(&tv);
if (((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) &&
inp->inp_in_hpts) {
/*
@@ -8200,9 +12043,23 @@
*/
rack_timer_cancel(tp, rack, cts, __LINE__);
}
- /* Mark that we have called rack_output(). */
+ /* Are we pacing and late? */
+ if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
+ TSTMP_GEQ(us_cts, rack->r_ctl.rc_last_output_to)) {
+ /* We are delayed */
+ delayed = us_cts - rack->r_ctl.rc_last_output_to;
+ } else {
+ delayed = 0;
+ }
+ /* Do the timers, which may override the pacer */
+ if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
+ if (rack_process_timers(tp, rack, cts, hpts_calling)) {
+ counter_u64_add(rack_out_size[TCP_MSS_ACCT_ATIMER], 1);
+ return (0);
+ }
+ }
if ((rack->r_timer_override) ||
- (tp->t_flags & TF_FORCEDATA) ||
+ (delayed) ||
(tp->t_state < TCPS_ESTABLISHED)) {
if (tp->t_inpcb->inp_in_hpts)
tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_OUTPUT);
@@ -8214,14 +12071,22 @@
counter_u64_add(rack_out_size[TCP_MSS_ACCT_INPACE], 1);
return (0);
}
- hpts_calling = inp->inp_hpts_calls;
inp->inp_hpts_calls = 0;
- if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
- if (rack_process_timers(tp, rack, cts, hpts_calling)) {
- counter_u64_add(rack_out_size[TCP_MSS_ACCT_ATIMER], 1);
- return (0);
- }
+ /* Finish out both pacing early and late accounting */
+ if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
+ TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
+ early = rack->r_ctl.rc_last_output_to - us_cts;
+ } else
+ early = 0;
+ if (delayed) {
+ rack->r_ctl.rc_agg_delayed += delayed;
+ rack->r_late = 1;
+ } else if (early) {
+ rack->r_ctl.rc_agg_early += early;
+ rack->r_early = 1;
}
+ /* Now that early/late accounting is done turn off the flag */
+ rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
rack->r_wanted_output = 0;
rack->r_timer_override = 0;
/*
@@ -8244,7 +12109,7 @@
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_cc_after_idle(rack, tp);
}
tp->t_flags &= ~TF_LASTIDLE;
if (idle) {
@@ -8253,6 +12118,23 @@
idle = 0;
}
}
+ if ((tp->snd_una == tp->snd_max) &&
+ rack->r_ctl.rc_went_idle_time &&
+ TSTMP_GT(us_cts, rack->r_ctl.rc_went_idle_time)) {
+ idle = us_cts - rack->r_ctl.rc_went_idle_time;
+ if (idle > rack_min_probertt_hold) {
+ /* Count as a probe rtt */
+ if (rack->in_probe_rtt == 0) {
+ rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
+ rack->r_ctl.rc_time_probertt_entered = rack->r_ctl.rc_lower_rtt_us_cts;
+ rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts;
+ rack->r_ctl.rc_time_of_last_probertt = rack->r_ctl.rc_lower_rtt_us_cts;
+ } else {
+ rack_exit_probertt(rack, us_cts);
+ }
+ }
+ idle = 0;
+ }
again:
/*
* If we've recently taken a timeout, snd_max will be greater than
@@ -8260,12 +12142,49 @@
* resending already delivered data. Adjust snd_nxt accordingly.
*/
sendalot = 0;
- cts = tcp_ts_getticks();
+ us_cts = tcp_get_usecs(&tv);
+ cts = tcp_tv_to_mssectick(&tv);
tso = 0;
mtu = 0;
+ segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
+ if (so->so_snd.sb_flags & SB_TLS_IFNET) {
+ minseg = rack->r_ctl.rc_pace_min_segs;
+ } else {
+ minseg = segsiz;
+ }
sb_offset = tp->snd_max - tp->snd_una;
- sendwin = min(tp->snd_wnd, tp->snd_cwnd);
-
+ cwnd_to_use = rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
+#ifdef NETFLIX_SHARED_CWND
+ if ((tp->t_flags2 & TF2_TCP_SCWND_ALLOWED) &&
+ rack->rack_enable_scwnd) {
+ /* We are doing cwnd sharing */
+ if (rack->rc_gp_filled &&
+ (rack->rack_attempted_scwnd == 0) &&
+ (rack->r_ctl.rc_scw == NULL) &&
+ tp->t_lib) {
+ /* The pcbid is in, lets make an attempt */
+ counter_u64_add(rack_try_scwnd, 1);
+ rack->rack_attempted_scwnd = 1;
+ rack->r_ctl.rc_scw = tcp_shared_cwnd_alloc(tp,
+ &rack->r_ctl.rc_scw_index,
+ segsiz);
+ }
+ if (rack->r_ctl.rc_scw &&
+ (rack->rack_scwnd_is_idle == 1) &&
+ (rack->rc_in_persist == 0) &&
+ sbavail(sb)) {
+ /* we are no longer out of data */
+ tcp_shared_cwnd_active(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
+ rack->rack_scwnd_is_idle = 0;
+ }
+ if (rack->r_ctl.rc_scw) {
+ /* First lets update and get the cwnd */
+ rack->r_ctl.cwnd_to_use = cwnd_to_use = tcp_shared_cwnd_update(rack->r_ctl.rc_scw,
+ rack->r_ctl.rc_scw_index,
+ tp->snd_cwnd, tp->snd_wnd, segsiz);
+ }
+ }
+#endif
flags = tcp_outflags[tp->t_state];
while (rack->rc_free_cnt < rack_free_cache) {
rsm = rack_alloc(rack);
@@ -8272,7 +12191,7 @@
if (rsm == NULL) {
if (inp->inp_hpts_calls)
/* Retry in a ms */
- slot = 1;
+ slot = (1 * HPTS_USEC_IN_MSEC);
goto just_return_nolock;
}
TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext);
@@ -8288,53 +12207,25 @@
SOCKBUF_LOCK(sb);
goto send;
}
- if (rack->r_ctl.rc_tlpsend) {
- /* Tail loss probe */
- long cwin;
- long tlen;
-
- doing_tlp = 1;
- /*
- * 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 > 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;
- } else if (rack->r_ctl.rc_resend) {
+ if (rack->r_ctl.rc_resend) {
/* Retransmit timer */
rsm = rack->r_ctl.rc_resend;
rack->r_ctl.rc_resend = NULL;
+ rsm->r_flags &= ~RACK_TLP;
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));
+ ("%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 >= ctf_fixed_maxseg(tp)) {
- len = ctf_fixed_maxseg(tp);
- }
+ if (len >= segsiz)
+ len = segsiz;
} else if ((rack->rc_in_persist == 0) &&
- ((rsm = tcp_rack_output(tp, rack, cts)) != NULL)) {
- int maxseg;
-
- maxseg = ctf_fixed_maxseg(tp);
+ ((rsm = tcp_rack_output(tp, rack, cts)) != NULL)) {
+ /* We have a retransmit that takes precedence */
+ rsm->r_flags &= ~RACK_TLP;
if ((!IN_RECOVERY(tp->t_flags)) &&
((tp->t_flags & (TF_WASFRECOVERY | TF_WASCRECOVERY)) == 0)) {
/* Enter recovery if not induced by a time-out */
@@ -8346,50 +12237,79 @@
* When we enter recovery we need to assure we send
* one packet.
*/
- rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
- rack_log_to_prr(rack, 13);
+ if (rack->rack_no_prr == 0) {
+ rack->r_ctl.rc_prr_sndcnt = segsiz;
+ rack_log_to_prr(rack, 13, 0);
+ }
}
#ifdef INVARIANTS
if (SEQ_LT(rsm->r_start, tp->snd_una)) {
panic("Huh, tp:%p rack:%p rsm:%p start:%u < snd_una:%u\n",
- tp, rack, rsm, rsm->r_start, tp->snd_una);
+ tp, rack, rsm, rsm->r_start, tp->snd_una);
}
#endif
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));
+ ("%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;
/* 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)) {
- /*
- * 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;
+ if (rack->rack_no_prr == 0) {
+ if ((rack->use_rack_rr == 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 < segsiz)) {
+ /*
+ * 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;
}
- len = rack->r_ctl.rc_prr_sndcnt;
}
sendalot = 0;
- if (len >= maxseg) {
- len = maxseg;
- }
+ if (len >= segsiz)
+ len = segsiz;
if (len > 0) {
sub_from_prr = 1;
sack_rxmit = 1;
KMOD_TCPSTAT_INC(tcps_sack_rexmits);
KMOD_TCPSTAT_ADD(tcps_sack_rexmit_bytes,
- min(len, ctf_fixed_maxseg(tp)));
+ min(len, segsiz));
counter_u64_add(rack_rtm_prr_retran, 1);
}
+ } else if (rack->r_ctl.rc_tlpsend) {
+ /* Tail loss probe */
+ long cwin;
+ long tlen;
+
+ doing_tlp = 1;
+ /*
+ * 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 = rack->r_ctl.rc_tlpsend;
+ rsm->r_flags |= RACK_TLP;
+ rack->r_ctl.rc_tlpsend = NULL;
+ sack_rxmit = 1;
+ tlen = rsm->r_end - rsm->r_start;
+ if (tlen > segsiz)
+ tlen = segsiz;
+ 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;
}
/*
* Enforce a connection sendmap count limit if set
@@ -8438,43 +12358,6 @@
}
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) {
- /*
- * 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 ((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
- * correct snd_nxt/snd_max and off.
- */
- tp->snd_nxt = tp->snd_max;
- sb_offset = tp->snd_nxt - 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
@@ -8489,7 +12372,7 @@
* If sack_rxmit is true we are retransmitting from the scoreboard
* in which case len is already set.
*/
- if (sack_rxmit == 0) {
+ if ((sack_rxmit == 0) && TCPS_HAVEESTABLISHED(tp->t_state)) {
uint32_t avail;
avail = sbavail(sb);
@@ -8497,7 +12380,7 @@
sb_offset = tp->snd_nxt - tp->snd_una;
else
sb_offset = 0;
- if (IN_RECOVERY(tp->t_flags) == 0) {
+ if ((IN_RECOVERY(tp->t_flags) == 0) || rack->rack_no_prr) {
if (rack->r_ctl.rc_tlp_new_data) {
/* TLP is forcing out new data */
if (rack->r_ctl.rc_tlp_new_data > (uint32_t) (avail - sb_offset)) {
@@ -8509,21 +12392,17 @@
len = rack->r_ctl.rc_tlp_new_data;
rack->r_ctl.rc_tlp_new_data = 0;
new_data_tlp = doing_tlp = 1;
- } else {
- if (sendwin > avail) {
- /* use the available */
- if (avail > sb_offset) {
- len = (int32_t)(avail - sb_offset);
- } else {
- len = 0;
- }
- } else {
- if (sendwin > sb_offset) {
- len = (int32_t)(sendwin - sb_offset);
- } else {
- len = 0;
- }
- }
+ } else
+ len = rack_what_can_we_send(tp, rack, cwnd_to_use, avail, sb_offset);
+ if (IN_RECOVERY(tp->t_flags) && (len > segsiz)) {
+ /*
+ * For prr=off, we need to send only 1 MSS
+ * at a time. We do this because another sack could
+ * be arriving that causes us to send retransmits and
+ * we don't want to be on a long pace due to a larger send
+ * that keeps us from sending out the retransmit.
+ */
+ len = segsiz;
}
} else {
uint32_t outstanding;
@@ -8538,11 +12417,13 @@
if (tp->snd_wnd > outstanding) {
len = tp->snd_wnd - outstanding;
/* Check to see if we have the data */
- if (((sb_offset + len) > avail) &&
- (avail > sb_offset))
- len = avail - sb_offset;
- else
- len = 0;
+ if ((sb_offset + len) > avail) {
+ /* It does not all fit */
+ if (avail > sb_offset)
+ len = avail - sb_offset;
+ else
+ len = 0;
+ }
} else
len = 0;
} else if (avail > sb_offset)
@@ -8557,7 +12438,7 @@
counter_u64_add(rack_rtm_prr_newdata, 1);
}
}
- if (len > ctf_fixed_maxseg(tp)) {
+ if (len > segsiz) {
/*
* We should never send more than a MSS when
* retransmitting or sending new data in prr
@@ -8566,8 +12447,8 @@
* let us send a lot as well :-)
*/
if (rack->r_ctl.rc_prr_sendalot == 0)
- len = ctf_fixed_maxseg(tp);
- } else if (len < ctf_fixed_maxseg(tp)) {
+ len = segsiz;
+ } else if (len < segsiz) {
/*
* Do we send any? The idea here is if the
* send empty's the socket buffer we want to
@@ -8583,6 +12464,17 @@
}
}
}
+ } else if (!TCPS_HAVEESTABLISHED(tp->t_state)) {
+ /*
+ * If you have not established
+ * and are not doing FAST OPEN
+ * no data please.
+ */
+ if ((sack_rxmit == 0) &&
+ (!IS_FASTOPEN(tp->t_flags))){
+ len = 0;
+ sb_offset = 0;
+ }
}
if (prefetch_so_done == 0) {
kern_prefetch(so, &prefetch_so_done);
@@ -8595,8 +12487,6 @@
*/
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;
/*
* When sending additional segments following a TFO SYN|ACK,
* do not include the SYN bit.
@@ -8604,7 +12494,6 @@
if (IS_FASTOPEN(tp->t_flags) &&
(tp->t_state == TCPS_SYN_RECEIVED))
flags &= ~TH_SYN;
- sb_offset--, len++;
}
/*
* Be careful not to send data and/or FIN on SYN segments. This
@@ -8667,19 +12556,21 @@
((doing_tlp == 0) || (new_data_tlp == 1)) &&
(len < rack->r_ctl.rc_pace_max_segs)) {
/*
- * We are not sending a full segment for
+ * We are not sending a maximum sized 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)) &&
+ if ((tp->snd_wnd < min(max(segsiz, (rack->r_ctl.rc_high_rwnd/2)), minseg)) &&
(TCPS_HAVEESTABLISHED(tp->t_state)) &&
+ (len < minseg) &&
(len < (int)(sbavail(sb) - sb_offset))) {
/*
* Here the rwnd is less than
- * the pacing size, this is not a retransmit,
+ * the minimum 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.
+ * we send nothing, and we may enter persists
+ * if nothing is outstanding.
*/
len = 0;
if (tp->snd_max == tp->snd_una) {
@@ -8690,10 +12581,10 @@
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)) &&
+ } else if ((cwnd_to_use >= max(minseg, (segsiz * 4))) &&
+ (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * segsiz)) &&
(len < (int)(sbavail(sb) - sb_offset)) &&
- (len < rack->r_ctl.rc_pace_min_segs)) {
+ (len < minseg)) {
/*
* Here we are not retransmitting, and
* the cwnd is not so small that we could
@@ -8706,8 +12597,8 @@
*/
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)) &&
+ min((rack->r_ctl.rc_high_rwnd/2), minseg)) &&
+ (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * segsiz)) &&
(len < (int)(sbavail(sb) - sb_offset)) &&
(TCPS_HAVEESTABLISHED(tp->t_state))) {
/*
@@ -8723,7 +12614,7 @@
}
/* len will be >= 0 after this point. */
KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
- tcp_sndbuf_autoscale(tp, so, sendwin);
+ tcp_sndbuf_autoscale(tp, so, min(tp->snd_wnd, cwnd_to_use));
/*
* Decide if we can use TCP Segmentation Offloading (if supported by
* hardware).
@@ -8748,7 +12639,7 @@
#endif
if (tp->t_inpcb->inp_options)
ipoptlen = tp->t_inpcb->inp_options->m_len -
- offsetof(struct ipoption, ipopt_list);
+ offsetof(struct ipoption, ipopt_list);
else
ipoptlen = 0;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
@@ -8764,8 +12655,8 @@
#endif
#endif /* INET6 */
#ifdef INET
- if (IPSEC_ENABLED(ipv4))
- ipsec_optlen = IPSEC_HDRSIZE(ipv4, tp->t_inpcb);
+ if (IPSEC_ENABLED(ipv4))
+ ipsec_optlen = IPSEC_HDRSIZE(ipv4, tp->t_inpcb);
#endif /* INET */
#endif
@@ -8772,7 +12663,7 @@
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
ipoptlen += ipsec_optlen;
#endif
- if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > ctf_fixed_maxseg(tp) &&
+ if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > segsiz &&
(tp->t_port == 0) &&
((tp->t_flags & TF_SIGNATURE) == 0) &&
tp->rcv_numsacks == 0 && sack_rxmit == 0 &&
@@ -8794,7 +12685,7 @@
flags &= ~TH_FIN;
} else {
if (SEQ_LT(tp->snd_nxt + len, tp->snd_una +
- sbused(sb)))
+ sbused(sb)))
flags &= ~TH_FIN;
}
}
@@ -8811,8 +12702,7 @@
* limited the window size) - we need to retransmit
*/
if (len) {
- if (len >= ctf_fixed_maxseg(tp)) {
- pass = 1;
+ if (len >= segsiz) {
goto send;
}
/*
@@ -8823,16 +12713,13 @@
*/
if (!(tp->t_flags & TF_MORETOCOME) && /* normal case */
(idle || (tp->t_flags & TF_NODELAY)) &&
- ((uint32_t)len + (uint32_t)sb_offset >= sbavail(&so->so_snd)) &&
+ ((uint32_t)len + (uint32_t)sb_offset >= sbavail(sb)) &&
(tp->t_flags & TF_NOPUSH) == 0) {
pass = 2;
goto send;
}
- if (tp->t_flags & TF_FORCEDATA) { /* typ. timeout case */
- pass = 3;
- goto send;
- }
if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */
+ pass = 22;
goto send;
}
if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
@@ -8847,6 +12734,18 @@
pass = 6;
goto send;
}
+ if (((tp->snd_wnd - ctf_outstanding(tp)) < segsiz) &&
+ (ctf_outstanding(tp) < (segsiz * 2))) {
+ /*
+ * We have less than two MSS outstanding (delayed ack)
+ * and our rwnd will not let us send a full sized
+ * MSS. Lets go ahead and let this small segment
+ * out because we want to try to have at least two
+ * packets inflight to not be caught by delayed ack.
+ */
+ pass = 12;
+ goto send;
+ }
}
/*
* Sending of standalone window updates.
@@ -8901,15 +12800,17 @@
if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale)
goto dontupdate;
- if (adv >= (int32_t)(2 * ctf_fixed_maxseg(tp)) &&
+ if (adv >= (int32_t)(2 * segsiz) &&
(adv >= (int32_t)(so->so_rcv.sb_hiwat / 4) ||
- recwin <= (int32_t)(so->so_rcv.sb_hiwat / 8) ||
- so->so_rcv.sb_hiwat <= 8 * ctf_fixed_maxseg(tp))) {
+ recwin <= (int32_t)(so->so_rcv.sb_hiwat / 8) ||
+ so->so_rcv.sb_hiwat <= 8 * segsiz)) {
pass = 7;
goto send;
}
- if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat)
+ if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) {
+ pass = 23;
goto send;
+ }
}
dontupdate:
@@ -8925,10 +12826,6 @@
pass = 9;
goto send;
}
- if (SEQ_GT(tp->snd_up, tp->snd_una)) {
- pass = 10;
- goto send;
- }
/*
* If our state indicates that FIN should be sent and we have not
* yet done so, then we need to send.
@@ -8944,32 +12841,189 @@
just_return:
SOCKBUF_UNLOCK(sb);
just_return_nolock:
- if (tot_len_this_send == 0)
- counter_u64_add(rack_out_size[TCP_MSS_ACCT_JUSTRET], 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);
+ {
+ int app_limited = CTF_JR_SENT_DATA;
+
+ if (tot_len_this_send > 0) {
+ /* Make sure snd_nxt is up to max */
+ if (SEQ_GT(tp->snd_max, tp->snd_nxt))
+ tp->snd_nxt = tp->snd_max;
+ slot = rack_get_pacing_delay(rack, tp, tot_len_this_send, NULL, segsiz);
+ } else {
+ int end_window = 0;
+ uint32_t seq = tp->gput_ack;
+
+ rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if (rsm) {
+ /*
+ * Mark the last sent that we just-returned (hinting
+ * that delayed ack may play a role in any rtt measurement).
+ */
+ rsm->r_just_ret = 1;
+ }
+ counter_u64_add(rack_out_size[TCP_MSS_ACCT_JUSTRET], 1);
+ rack->r_ctl.rc_agg_delayed = 0;
+ rack->r_early = 0;
+ rack->r_late = 0;
+ rack->r_ctl.rc_agg_early = 0;
+ if ((ctf_outstanding(tp) +
+ min(max(segsiz, (rack->r_ctl.rc_high_rwnd/2)),
+ minseg)) >= tp->snd_wnd) {
+ /* We are limited by the rwnd */
+ app_limited = CTF_JR_RWND_LIMITED;
+ } else if (ctf_outstanding(tp) >= sbavail(sb)) {
+ /* We are limited by whats available -- app limited */
+ app_limited = CTF_JR_APP_LIMITED;
+ } else if ((idle == 0) &&
+ ((tp->t_flags & TF_NODELAY) == 0) &&
+ ((uint32_t)len + (uint32_t)sb_offset >= sbavail(sb)) &&
+ (len < segsiz)) {
+ /*
+ * No delay is not on and the
+ * user is sending less than 1MSS. This
+ * brings out SWS avoidance so we
+ * don't send. Another app-limited case.
+ */
+ app_limited = CTF_JR_APP_LIMITED;
+ } else if (tp->t_flags & TF_NOPUSH) {
+ /*
+ * The user has requested no push of
+ * the last segment and we are
+ * at the last segment. Another app
+ * limited case.
+ */
+ app_limited = CTF_JR_APP_LIMITED;
+ } else if ((ctf_outstanding(tp) + minseg) > cwnd_to_use) {
+ /* Its the cwnd */
+ app_limited = CTF_JR_CWND_LIMITED;
+ } else if (rack->rc_in_persist == 1) {
+ /* We are in persists */
+ app_limited = CTF_JR_PERSISTS;
+ } else if (IN_RECOVERY(tp->t_flags) &&
+ (rack->rack_no_prr == 0) &&
+ (rack->r_ctl.rc_prr_sndcnt < segsiz)) {
+ app_limited = CTF_JR_PRR;
+ } else {
+ /* Now why here are we not sending? */
+#ifdef NOW
+#ifdef INVARIANTS
+ panic("rack:%p hit JR_ASSESSING case cwnd_to_use:%u?", rack, cwnd_to_use);
+#endif
+#endif
+ app_limited = CTF_JR_ASSESSING;
+ }
+ /*
+ * App limited in some fashion, for our pacing GP
+ * measurements we don't want any gap (even cwnd).
+ * Close down the measurement window.
+ */
+ if (rack_cwnd_block_ends_measure &&
+ ((app_limited == CTF_JR_CWND_LIMITED) ||
+ (app_limited == CTF_JR_PRR))) {
+ /*
+ * The reason we are not sending is
+ * the cwnd (or prr). We have been configured
+ * to end the measurement window in
+ * this case.
+ */
+ end_window = 1;
+ } else if (app_limited == CTF_JR_PERSISTS) {
+ /*
+ * We never end the measurement window
+ * in persists, though in theory we
+ * should be only entering after everything
+ * is acknowledged (so we will probably
+ * never come here).
+ */
+ end_window = 0;
+ } else if (rack_rwnd_block_ends_measure &&
+ (app_limited == CTF_JR_RWND_LIMITED)) {
+ /*
+ * We are rwnd limited and have been
+ * configured to end the measurement
+ * window in this case.
+ */
+ end_window = 1;
+ } else if (app_limited == CTF_JR_APP_LIMITED) {
+ /*
+ * A true application limited period, we have
+ * ran out of data.
+ */
+ end_window = 1;
+ } else if (app_limited == CTF_JR_ASSESSING) {
+ /*
+ * In the assessing case we hit the end of
+ * the if/else and had no known reason
+ * This will panic us under invariants..
+ *
+ * If we get this out in logs we need to
+ * investagate which reason we missed.
+ */
+ end_window = 1;
+ }
+ if (end_window) {
+ uint8_t log = 0;
+
+ if ((tp->t_flags & TF_GPUTINPROG) &&
+ SEQ_GT(tp->gput_ack, tp->snd_max)) {
+ /* Mark the last packet has app limited */
+ tp->gput_ack = tp->snd_max;
+ log = 1;
+ }
+ rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
+ if (rsm && ((rsm->r_flags & RACK_APP_LIMITED) == 0)) {
+ if (rack->r_ctl.rc_app_limited_cnt == 0)
+ rack->r_ctl.rc_end_appl = rack->r_ctl.rc_first_appl = rsm;
+ else {
+ /*
+ * Go out to the end app limited and mark
+ * this new one as next and move the end_appl up
+ * to this guy.
+ */
+ if (rack->r_ctl.rc_end_appl)
+ rack->r_ctl.rc_end_appl->r_nseq_appl = rsm->r_start;
+ rack->r_ctl.rc_end_appl = rsm;
+ }
+ rsm->r_flags |= RACK_APP_LIMITED;
+ rack->r_ctl.rc_app_limited_cnt++;
+ }
+ if (log)
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rc_app_limited_cnt, seq,
+ tp->gput_ack, 0, 0, 4, __LINE__, NULL);
+ }
+ }
+ 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(sb) &&
+ (sbavail(sb) > tp->snd_wnd) &&
+ (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), minseg))) {
+ /* 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, app_limited, cwnd_to_use);
}
- /* 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);
+#ifdef NETFLIX_SHARED_CWND
+ if ((sbavail(sb) == 0) &&
+ rack->r_ctl.rc_scw) {
+ tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
+ rack->rack_scwnd_is_idle = 1;
}
- 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;
+#endif
return (0);
send:
if ((flags & TH_FIN) &&
- sbavail(&tp->t_inpcb->inp_socket->so_snd)) {
+ sbavail(sb)) {
/*
* We do not transmit a FIN
* with data outstanding. We
@@ -8978,19 +13032,15 @@
*/
flags &= ~TH_FIN;
}
- 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.
- */
- rack->rc_tlp_in_progress = 0;
+ /* Enforce stack imposed max seg size if we have one */
+ if (rack->r_ctl.rc_pace_max_segs &&
+ (len > rack->r_ctl.rc_pace_max_segs)) {
+ mark = 1;
+ len = rack->r_ctl.rc_pace_max_segs;
}
SOCKBUF_LOCK_ASSERT(sb);
if (len > 0) {
- if (len >= ctf_fixed_maxseg(tp))
+ if (len >= segsiz)
tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT;
else
tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT;
@@ -9039,14 +13089,14 @@
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;
+ (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;
+ tp->t_tfo_client_cookie_len;
to.to_tfo_cookie =
- tp->t_tfo_cookie.client;
+ tp->t_tfo_cookie.client;
to.to_flags |= TOF_FASTOPEN;
wanted_cookie = 1;
/*
@@ -9080,7 +13130,7 @@
if (flags & TH_SYN)
to.to_flags |= TOF_SACKPERM;
else if (TCPS_HAVEESTABLISHED(tp->t_state) &&
- tp->rcv_numsacks > 0) {
+ tp->rcv_numsacks > 0) {
to.to_flags |= TOF_SACK;
to.to_nsacks = tp->rcv_numsacks;
to.to_sacks = (u_char *)tp->sackblks;
@@ -9116,11 +13166,11 @@
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;
+ if (tp->t_inpcb->inp_options)
+ ipoptlen = tp->t_inpcb->inp_options->m_len -
+ offsetof(struct ipoption, ipopt_list);
+ else
+ ipoptlen = 0;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
ipoptlen += ipsec_optlen;
#endif
@@ -9147,7 +13197,7 @@
if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
KASSERT(ipoptlen == 0,
- ("%s: TSO can't do IP options", __func__));
+ ("%s: TSO can't do IP options", __func__));
/*
* Check if we should limit by maximum payload
@@ -9156,12 +13206,13 @@
if (if_hw_tsomax != 0) {
/* compute maximum TSO length */
max_len = (if_hw_tsomax - hdrlen -
- max_linkhdr);
+ max_linkhdr);
if (max_len <= 0) {
len = 0;
} else if (len > max_len) {
sendalot = 1;
len = max_len;
+ mark = 2;
}
}
/*
@@ -9173,8 +13224,8 @@
(hw_tls == 0)) {
moff = len % (u_int)max_len;
if (moff != 0) {
+ mark = 3;
len -= moff;
- sendalot = 1;
}
}
/*
@@ -9181,9 +13232,8 @@
* In case there are too many small fragments don't
* use TSO:
*/
- if (len <= maxseg) {
- len = max_len;
- sendalot = 1;
+ if (len <= segsiz) {
+ mark = 4;
tso = 0;
}
/*
@@ -9192,10 +13242,11 @@
* implementations to clear the FIN flag on all but
* the last segment.
*/
- if (tp->t_flags & TF_NEEDFIN)
- sendalot = 1;
-
+ if (tp->t_flags & TF_NEEDFIN) {
+ sendalot = 4;
+ }
} else {
+ mark = 5;
if (optlen + ipoptlen >= tp->t_maxseg) {
/*
* Since we don't have enough space to put
@@ -9211,19 +13262,21 @@
goto out;
}
len = tp->t_maxseg - optlen - ipoptlen;
- sendalot = 1;
+ sendalot = 5;
}
- } else
+ } else {
tso = 0;
+ mark = 6;
+ }
KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET,
- ("%s: len > IP_MAXPACKET", __func__));
+ ("%s: len > IP_MAXPACKET", __func__));
#ifdef DIAGNOSTIC
#ifdef INET6
if (max_linkhdr + hdrlen > MCLBYTES)
#else
- if (max_linkhdr + hdrlen > MHLEN)
+ if (max_linkhdr + hdrlen > MHLEN)
#endif
- panic("tcphdr too big");
+ panic("tcphdr too big");
#endif
/*
@@ -9249,16 +13302,17 @@
uint32_t max_val;
uint32_t moff;
- if (rack->rc_pace_max_segs)
- max_val = rack->rc_pace_max_segs * ctf_fixed_maxseg(tp);
+ if (rack->r_ctl.rc_pace_max_segs)
+ max_val = rack->r_ctl.rc_pace_max_segs;
+ else if (rack->rc_user_set_max_segs)
+ max_val = rack->rc_user_set_max_segs * segsiz;
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.
*/
if (len > max_val) {
+ mark = 7;
len = max_val;
}
#ifdef INET6
@@ -9284,7 +13338,7 @@
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);
+ mtod(m, caddr_t)+hdrlen);
if (SEQ_LT(tp->snd_nxt, tp->snd_max))
sbsndptr_adv(sb, mb, len);
m->m_len += len;
@@ -9300,8 +13354,8 @@
tp,
#endif
mb, moff, &len,
- if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb,
- ((rsm == NULL) ? hw_tls : 0)
+ if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb,
+ ((rsm == NULL) ? hw_tls : 0)
#ifdef NETFLIX_COPY_ARGS
, &filled_all
#endif
@@ -9323,17 +13377,7 @@
goto out;
}
}
- if ((tp->t_flags & TF_FORCEDATA) && len == 1) {
- KMOD_TCPSTAT_INC(tcps_sndprobe);
-#ifdef STATS
- if (SEQ_LT(tp->snd_nxt, tp->snd_max))
- stats_voi_update_abs_u32(tp->t_stats,
- VOI_TCP_RETXPB, len);
- else
- stats_voi_update_abs_u64(tp->t_stats,
- VOI_TCP_TXPB, len);
-#endif
- } else if (SEQ_LT(tp->snd_nxt, tp->snd_max) || sack_rxmit) {
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max) || sack_rxmit) {
if (rsm && (rsm->r_flags & RACK_TLP)) {
/*
* TLP should not count in retran count, but
@@ -9348,7 +13392,7 @@
}
#ifdef STATS
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB,
- len);
+ len);
#endif
} else {
KMOD_TCPSTAT_INC(tcps_sndpack);
@@ -9355,7 +13399,7 @@
KMOD_TCPSTAT_ADD(tcps_sndbyte, len);
#ifdef STATS
stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB,
- len);
+ len);
#endif
}
/*
@@ -9368,21 +13412,6 @@
!(flags & TH_SYN))
flags |= TH_PUSH;
- /*
- * 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.
- */
- if (((tp->t_state == TCPS_ESTABLISHED) ||
- (tp->t_state == TCPS_CLOSE_WAIT) ||
- ((tp->t_state == TCPS_FIN_WAIT_1) &&
- ((tp->t_flags & TF_SENTFIN) == 0) &&
- ((flags & TH_FIN) == 0))) &&
- ((flags & TH_RST) == 0)) {
- /* Get our pacing rate */
- tot_len_this_send += len;
- slot = rack_get_pacing_delay(rack, tp, tot_len_this_send);
- }
SOCKBUF_UNLOCK(sb);
} else {
SOCKBUF_UNLOCK(sb);
@@ -9390,8 +13419,6 @@
KMOD_TCPSTAT_INC(tcps_sndacks);
else if (flags & (TH_SYN | TH_FIN | TH_RST))
KMOD_TCPSTAT_INC(tcps_sndctrl);
- else if (SEQ_GT(tp->snd_up, tp->snd_una))
- KMOD_TCPSTAT_INC(tcps_sndurg);
else
KMOD_TCPSTAT_INC(tcps_sndwinup);
@@ -9483,11 +13510,10 @@
/*
* If the peer has ECN, mark data packets with ECN capable
* transmission (ECT). Ignore pure ack packets,
- * retransmissions and window probes.
+ * retransmissions.
*/
if (len > 0 && SEQ_GEQ(tp->snd_nxt, tp->snd_max) &&
- (sack_rxmit == 0) &&
- !((tp->t_flags & TF_FORCEDATA) && len == 1)) {
+ (sack_rxmit == 0)) {
#ifdef INET6
if (isipv6)
ip6->ip6_flow |= htonl(IPTOS_ECN_ECT0 << 20);
@@ -9554,7 +13580,7 @@
recwin = 0;
} else {
if (recwin < (long)(so->so_rcv.sb_hiwat / 4) &&
- recwin < (long)ctf_fixed_maxseg(tp))
+ recwin < (long)segsiz)
recwin = 0;
if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
recwin < (long)(tp->rcv_adv - tp->rcv_nxt))
@@ -9570,7 +13596,7 @@
*/
if (flags & TH_SYN)
th->th_win = htons((u_short)
- (min(sbspace(&so->so_rcv), TCP_MAXWIN)));
+ (min(sbspace(&so->so_rcv), TCP_MAXWIN)));
else
th->th_win = htons((u_short)(recwin >> tp->rcv_scale));
/*
@@ -9586,17 +13612,7 @@
tp->t_flags |= TF_RXWIN0SENT;
} else
tp->t_flags &= ~TF_RXWIN0SENT;
- if (SEQ_GT(tp->snd_up, tp->snd_nxt)) {
- th->th_urp = htons((u_short)(tp->snd_up - tp->snd_nxt));
- 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 */
+ tp->snd_up = tp->snd_una; /* drag it along, its deprecated */
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
if (to.to_flags & TOF_SIGNATURE) {
@@ -9607,7 +13623,7 @@
* mbuf's data, calculate offset and use it.
*/
if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th,
- (u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
+ (u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
/*
* Do not send segment if the calculation of MD5
* digest has failed.
@@ -9638,8 +13654,8 @@
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);
+ sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
+ 0);
}
}
#endif
@@ -9652,7 +13668,7 @@
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));
+ ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
th->th_sum = htons(0);
UDPSTAT_INC(udps_opackets);
} else {
@@ -9659,12 +13675,12 @@
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));
+ ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
+ IPPROTO_TCP + len + optlen));
}
/* 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));
+ ("%s: IP version incorrect: %d", __func__, ip->ip_v));
}
#endif
/*
@@ -9674,13 +13690,13 @@
*/
if (tso || force_tso) {
KASSERT(force_tso || len > tp->t_maxseg - optlen,
- ("%s: len <= tso_segsz", __func__));
+ ("%s: len <= tso_segsz", __func__));
m->m_pkthdr.csum_flags |= CSUM_TSO;
m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen;
}
KASSERT(len + hdrlen == m_length(m, NULL),
- ("%s: mbuf chain different than expected: %d + %u != %u",
- __func__, 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_TCP_ESTABLISHED_OUT helper hooks. */
@@ -9699,7 +13715,7 @@
{
save = ipov->ih_len;
ipov->ih_len = htons(m->m_pkthdr.len /* - hdrlen +
- * (th->th_off << 2) */ );
+ * (th->th_off << 2) */ );
}
tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0);
#ifdef INET6
@@ -9717,7 +13733,10 @@
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;
+ if (rack->rack_no_prr)
+ log.u_bbr.flex1 = 0;
+ else
+ 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;
@@ -9725,16 +13744,27 @@
log.u_bbr.flex5 = 0x80000000;
else
log.u_bbr.flex5 = 0;
+ /* Save off the early/late values */
+ log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
+ log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
+ log.u_bbr.bw_inuse = rack_get_bw(rack);
if (rsm || sack_rxmit) {
- log.u_bbr.flex8 = 1;
+ if (doing_tlp)
+ log.u_bbr.flex8 = 2;
+ else
+ log.u_bbr.flex8 = 1;
} else {
log.u_bbr.flex8 = 0;
}
+ log.u_bbr.pacing_gain = rack_get_output_gain(rack, rsm);
+ log.u_bbr.flex7 = mark;
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);
+ log.u_bbr.lt_epoch = cwnd_to_use;
+ log.u_bbr.delivered = sendalot;
lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK,
- len, &log, false, NULL, NULL, 0, &tv);
+ len, &log, false, NULL, NULL, 0, &tv);
} else
lgb = NULL;
@@ -9774,10 +13804,10 @@
TCP_PROBE5(send, NULL, tp, ip6, tp, th);
/* TODO: IPv6 IP6TOS_ECT bit on */
- error = ip6_output(m, tp->t_inpcb->in6p_outputopts,
- &inp->inp_route6,
- ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0),
- NULL, NULL, inp);
+ 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_nh != NULL)
mtu = inp->inp_route6.ro_nh->nh_mtu;
@@ -9817,9 +13847,9 @@
TCP_PROBE5(send, NULL, tp, ip, tp, th);
- error = ip_output(m, tp->t_inpcb->inp_options, &inp->inp_route,
- ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0), 0,
- inp);
+ 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_nh != NULL)
mtu = inp->inp_route.ro_nh->nh_mtu;
}
@@ -9835,10 +13865,24 @@
* retransmit. In persist state, just set snd_max.
*/
if (error == 0) {
+ rack->forced_ack = 0; /* If we send something zap the FA flag */
+ if (rsm && (doing_tlp == 0)) {
+ /* Set we retransmitted */
+ rack->rc_gp_saw_rec = 1;
+ } else {
+ if (cwnd_to_use > tp->snd_ssthresh) {
+ /* Set we sent in CA */
+ rack->rc_gp_saw_ca = 1;
+ } else {
+ /* Set we sent in SS */
+ rack->rc_gp_saw_ss = 1;
+ }
+ }
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(tp->t_flags & TF_SACK_PERMIT) &&
tp->rcv_numsacks > 0)
tcp_clean_dsack_blocks(tp);
+ tot_len_this_send += len;
if (len == 0)
counter_u64_add(rack_out_size[TCP_MSS_ACCT_SNDACK], 1);
else if (len == 1) {
@@ -9846,7 +13890,7 @@
} else if (len > 1) {
int idx;
- idx = (len / ctf_fixed_maxseg(tp)) + 3;
+ idx = (len / segsiz) + 3;
if (idx >= TCP_MSS_ACCT_ATIMER)
counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
else
@@ -9863,13 +13907,13 @@
} 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)) {
+ } else if ( (ctf_outstanding(tp) + minseg) > 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) {
+ } else if ((ctf_flight_size(tp, rack->r_ctl.rc_sacked) + minseg) > cwnd_to_use) {
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) {
+ } else if ((ctf_outstanding(tp) + minseg) > tp->snd_wnd) {
counter_u64_add(rack_tls_rwnd, 1);
rack_log_type_hrdwtso(tp, rack, len, 6, orig_len, 1);
} else {
@@ -9879,23 +13923,28 @@
}
}
}
- if (sub_from_prr && (error == 0)) {
- if (rack->r_ctl.rc_prr_sndcnt >= len)
- rack->r_ctl.rc_prr_sndcnt -= len;
- else
- rack->r_ctl.rc_prr_sndcnt = 0;
- }
+ if (rack->rack_no_prr == 0) {
+ if (sub_from_prr && (error == 0)) {
+ if (rack->r_ctl.rc_prr_sndcnt >= len)
+ rack->r_ctl.rc_prr_sndcnt -= len;
+ else
+ rack->r_ctl.rc_prr_sndcnt = 0;
+ }
+ }
sub_from_prr = 0;
rack_log_output(tp, &to, len, rack_seq, (uint8_t) flags, error, cts,
- pass, rsm);
+ pass, rsm, us_cts);
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)) {
+ /* Now are we in persists? */
+ if (rack->rc_in_persist == 0) {
tcp_seq startseq = tp->snd_nxt;
+ /* Track our lost count */
+ if (rsm && (doing_tlp == 0))
+ rack->r_ctl.rc_loss_count += rsm->r_end - rsm->r_start;
/*
* Advance snd_nxt over sequence space of this segment.
*/
@@ -9902,7 +13951,25 @@
if (error)
/* We don't log or do anything with errors */
goto nomore;
-
+ if (doing_tlp == 0) {
+ if (rsm == NULL) {
+ /*
+ * Not a retransmission of some
+ * sort, new data is going out so
+ * clear our TLP count and flag.
+ */
+ rack->rc_tlp_in_progress = 0;
+ rack->r_ctl.rc_tlp_cnt_out = 0;
+ }
+ } else {
+ /*
+ * We have just sent a TLP, mark that it is true
+ * and make sure our in progress is set so we
+ * continue to check the count.
+ */
+ rack->rc_tlp_in_progress = 1;
+ rack->r_ctl.rc_tlp_cnt_out++;
+ }
if (flags & (TH_SYN | TH_FIN)) {
if (flags & TH_SYN)
tp->snd_nxt++;
@@ -9937,15 +14004,9 @@
tp->t_rtseq = startseq;
KMOD_TCPSTAT_INC(tcps_segstimed);
}
-#ifdef STATS
- if (!(tp->t_flags & TF_GPUTINPROG) && len) {
- tp->t_flags |= TF_GPUTINPROG;
- tp->gput_seq = startseq;
- tp->gput_ack = startseq +
- ulmin(sbavail(sb) - sb_offset, sendwin);
- tp->gput_ts = tcp_ts_getticks();
- }
-#endif
+ if (len &&
+ ((tp->t_flags & TF_GPUTINPROG) == 0))
+ rack_start_gp_measurement(tp, rack, startseq, sb_offset);
}
} else {
/*
@@ -9978,6 +14039,10 @@
}
nomore:
if (error) {
+ rack->r_ctl.rc_agg_delayed = 0;
+ rack->r_early = 0;
+ rack->r_late = 0;
+ rack->r_ctl.rc_agg_early = 0;
SOCKBUF_UNLOCK_ASSERT(sb); /* Check gotos. */
/*
* Failures do not advance the seq counter above. For the
@@ -9991,7 +14056,6 @@
sendalot = 0;
switch (error) {
case EPERM:
- tp->t_flags &= ~TF_FORCEDATA;
tp->t_softerror = error;
return (error);
case ENOBUFS:
@@ -10000,14 +14064,14 @@
* Pace us right away to retry in a some
* time
*/
- slot = 1 + rack->rc_enobuf;
- if (rack->rc_enobuf < 255)
+ slot = ((1 + rack->rc_enobuf) * HPTS_USEC_IN_MSEC);
+ if (rack->rc_enobuf < 126)
rack->rc_enobuf++;
- if (slot > (rack->rc_rack_rtt / 2)) {
- slot = rack->rc_rack_rtt / 2;
+ if (slot > ((rack->rc_rack_rtt / 2) * HPTS_USEC_IN_MSEC)) {
+ slot = (rack->rc_rack_rtt / 2) * HPTS_USEC_IN_MSEC;
}
- if (slot < 10)
- slot = 10;
+ if (slot < (10 * HPTS_USEC_IN_MSEC))
+ slot = 10 * HPTS_USEC_IN_MSEC;
}
counter_u64_add(rack_saw_enobuf, 1);
error = 0;
@@ -10027,9 +14091,8 @@
tcp_mss_update(tp, -1, mtu, NULL, NULL);
goto again;
}
- slot = 10;
+ slot = 10 * HPTS_USEC_IN_MSEC;
rack_start_hpts_timer(rack, tp, cts, slot, 0, 0);
- tp->t_flags &= ~TF_FORCEDATA;
return (error);
case ENETUNREACH:
counter_u64_add(rack_saw_enetunreach, 1);
@@ -10041,9 +14104,8 @@
}
/* FALLTHROUGH */
default:
- slot = 10;
+ slot = 10 * HPTS_USEC_IN_MSEC;
rack_start_hpts_timer(rack, tp, cts, slot, 0, 0);
- tp->t_flags &= ~TF_FORCEDATA;
return (error);
}
} else {
@@ -10061,7 +14123,23 @@
tp->last_ack_sent = tp->rcv_nxt;
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
enobufs:
- rack->r_tlp_running = 0;
+ /* Assure when we leave that snd_nxt will point to top */
+ if (SEQ_GT(tp->snd_max, tp->snd_nxt))
+ tp->snd_nxt = tp->snd_max;
+ if (sendalot) {
+ /* Do we need to turn off sendalot? */
+ if (rack->r_ctl.rc_pace_max_segs &&
+ (tot_len_this_send >= rack->r_ctl.rc_pace_max_segs)) {
+ /* We hit our max. */
+ sendalot = 0;
+ } else if ((rack->rc_user_set_max_segs) &&
+ (tot_len_this_send >= (rack->rc_user_set_max_segs * segsiz))) {
+ /* We hit the user defined max */
+ sendalot = 0;
+ }
+ }
+ if ((error == 0) && (flags & TH_FIN))
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_FIN);
if (flags & TH_RST) {
/*
* We don't send again after sending a RST.
@@ -10068,16 +14146,31 @@
*/
slot = 0;
sendalot = 0;
- }
- if (rsm && (slot == 0)) {
+ if (error == 0)
+ tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
+ } else if ((slot == 0) && (sendalot == 0) && tot_len_this_send) {
/*
- * 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.
+ * Get our pacing rate, if an error
+ * occured in sending (ENOBUF) we would
+ * hit the else if with slot preset. Other
+ * errors return.
*/
- slot = rack->r_ctl.rc_min_to;
+ slot = rack_get_pacing_delay(rack, tp, tot_len_this_send, rsm, segsiz);
}
+ if (rsm &&
+ rack->use_rack_rr) {
+ /* Its a retransmit and we use the rack cheat? */
+ if ((slot == 0) ||
+ (rack->rc_always_pace == 0) ||
+ (rack->r_rr_config == 1)) {
+ /*
+ * We have no pacing set or we
+ * are using old-style rack or
+ * we are overriden to use the old 1ms pacing.
+ */
+ slot = rack->r_ctl.rc_min_to * HPTS_USEC_IN_MSEC;
+ }
+ }
if (slot) {
/* set the rack tcb into the slot N */
counter_u64_add(rack_paced_segments, 1);
@@ -10085,16 +14178,25 @@
if (len)
counter_u64_add(rack_unpaced_segments, 1);
sack_rxmit = 0;
- tp->t_flags &= ~TF_FORCEDATA;
goto again;
} else if (len) {
counter_u64_add(rack_unpaced_segments, 1);
}
- tp->t_flags &= ~TF_FORCEDATA;
rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, 0);
return (error);
}
+static void
+rack_update_seg(struct tcp_rack *rack)
+{
+ uint32_t orig_val;
+
+ orig_val = rack->r_ctl.rc_pace_max_segs;
+ rack_set_pace_segments(rack->rc_tp, rack, __LINE__);
+ if (orig_val != rack->r_ctl.rc_pace_max_segs)
+ rack_log_pacing_delay_calc(rack, 0, 0, orig_val, 0, 0, 15, __LINE__, NULL);
+}
+
/*
* rack_ctloutput() must drop the inpcb lock before performing copyin on
* socket option arguments. When it re-acquires the lock after the copy, it
@@ -10105,34 +14207,56 @@
rack_set_sockopt(struct socket *so, struct sockopt *sopt,
struct inpcb *inp, struct tcpcb *tp, struct tcp_rack *rack)
{
- struct epoch_tracker et;
+ uint64_t val;
int32_t error = 0, optval;
+ uint16_t ca, ss;
+
switch (sopt->sopt_name) {
- case TCP_RACK_PROP_RATE:
- case TCP_RACK_PROP:
- case TCP_RACK_TLP_REDUCE:
- case TCP_RACK_EARLY_RECOV:
- case TCP_RACK_PACE_ALWAYS:
+ case TCP_RACK_PROP_RATE: /* URL:prop_rate */
+ case TCP_RACK_PROP : /* URL:prop */
+ case TCP_RACK_TLP_REDUCE: /* URL:tlp_reduce */
+ case TCP_RACK_EARLY_RECOV: /* URL:early_recov */
+ case TCP_RACK_PACE_REDUCE: /* Not used */
+ /* Pacing related ones */
+ case TCP_RACK_PACE_ALWAYS: /* URL:pace_always */
+ case TCP_BBR_RACK_INIT_RATE: /* URL:irate */
+ case TCP_BBR_IWINTSO: /* URL:tso_iwin */
+ case TCP_RACK_PACE_MAX_SEG: /* URL:pace_max_seg */
+ case TCP_RACK_FORCE_MSEG: /* URL:force_max_seg */
+ case TCP_RACK_PACE_RATE_CA: /* URL:pr_ca */
+ case TCP_RACK_PACE_RATE_SS: /* URL:pr_ss*/
+ case TCP_RACK_PACE_RATE_REC: /* URL:pr_rec */
+ case TCP_RACK_GP_INCREASE_CA: /* URL:gp_inc_ca */
+ case TCP_RACK_GP_INCREASE_SS: /* URL:gp_inc_ss */
+ case TCP_RACK_GP_INCREASE_REC: /* URL:gp_inc_rec */
+ case TCP_RACK_RR_CONF: /* URL:rrr_conf */
+ case TCP_BBR_HDWR_PACE: /* URL:hdwrpace */
+ /* End pacing related */
case TCP_DELACK:
- case TCP_RACK_PACE_REDUCE:
- case TCP_RACK_PACE_MAX_SEG:
- case TCP_RACK_PRR_SENDALOT:
- case TCP_RACK_MIN_TO:
- case TCP_RACK_EARLY_SEG:
- case TCP_RACK_REORD_THRESH:
- case TCP_RACK_REORD_FADE:
- case TCP_RACK_TLP_THRESH:
- case TCP_RACK_PKT_DELAY:
- case TCP_RACK_TLP_USE:
- case TCP_RACK_TLP_INC_VAR:
- case TCP_RACK_IDLE_REDUCE_HIGH:
- case TCP_RACK_MIN_PACE:
- case TCP_RACK_GP_INCREASE:
- case TCP_BBR_RACK_RTT_USE:
- case TCP_BBR_USE_RACK_CHEAT:
- case TCP_RACK_DO_DETECTION:
+ case TCP_RACK_PRR_SENDALOT: /* URL:prr_sendalot */
+ case TCP_RACK_MIN_TO: /* URL:min_to */
+ case TCP_RACK_EARLY_SEG: /* URL:early_seg */
+ case TCP_RACK_REORD_THRESH: /* URL:reord_thresh */
+ case TCP_RACK_REORD_FADE: /* URL:reord_fade */
+ case TCP_RACK_TLP_THRESH: /* URL:tlp_thresh */
+ case TCP_RACK_PKT_DELAY: /* URL:pkt_delay */
+ case TCP_RACK_TLP_USE: /* URL:tlp_use */
+ case TCP_RACK_TLP_INC_VAR: /* URL:tlp_inc_var */
+ case TCP_RACK_IDLE_REDUCE_HIGH: /* URL:idle_reduce_high */
+ case TCP_BBR_RACK_RTT_USE: /* URL:rttuse */
+ case TCP_BBR_USE_RACK_RR: /* URL:rackrr */
+ case TCP_RACK_DO_DETECTION: /* URL:detect */
+ case TCP_NO_PRR: /* URL:noprr */
+ case TCP_TIMELY_DYN_ADJ: /* URL:dynamic */
case TCP_DATA_AFTER_CLOSE:
+ case TCP_RACK_NONRXT_CFG_RATE: /* URL:nonrxtcr */
+ case TCP_SHARED_CWND_ENABLE: /* URL:scwnd */
+ case TCP_RACK_MBUF_QUEUE: /* URL:mqueue */
+ case TCP_RACK_NO_PUSH_AT_MAX: /* URL:npush */
+ case TCP_RACK_PACE_TO_FILL: /* URL:fillcw */
+ case TCP_SHARED_CWND_TIME_LIMIT: /* URL:lscwnd */
+ case TCP_RACK_PROFILE: /* URL:profile */
break;
default:
return (tcp_default_ctloutput(so, sopt, inp, tp));
@@ -10150,6 +14274,132 @@
tp = intotcpcb(inp);
rack = (struct tcp_rack *)tp->t_fb_ptr;
switch (sopt->sopt_name) {
+ case TCP_RACK_PROFILE:
+ RACK_OPTS_INC(tcp_profile);
+ if (optval == 1) {
+ /* pace_always=1 */
+ rack->rc_always_pace = 1;
+ tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ;
+ /* scwnd=1 */
+ rack->rack_enable_scwnd = 1;
+ /* dynamic=100 */
+ rack->rc_gp_dyn_mul = 1;
+ rack->r_ctl.rack_per_of_gp_ca = 100;
+ /* rrr_conf=3 */
+ rack->r_rr_config = 3;
+ /* npush=2 */
+ rack->r_ctl.rc_no_push_at_mrtt = 2;
+ /* fillcw=1 */
+ rack->rc_pace_to_cwnd = 1;
+ rack->rc_pace_fill_if_rttin_range = 0;
+ rack->rtt_limit_mul = 0;
+ /* noprr=1 */
+ rack->rack_no_prr = 1;
+ /* lscwnd=1 */
+ rack->r_limit_scw = 1;
+ } else if (optval == 2) {
+ /* pace_always=1 */
+ rack->rc_always_pace = 1;
+ tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ;
+ /* scwnd=1 */
+ rack->rack_enable_scwnd = 1;
+ /* dynamic=100 */
+ rack->rc_gp_dyn_mul = 1;
+ rack->r_ctl.rack_per_of_gp_ca = 100;
+ /* rrr_conf=3 */
+ rack->r_rr_config = 3;
+ /* npush=2 */
+ rack->r_ctl.rc_no_push_at_mrtt = 2;
+ /* fillcw=1 */
+ rack->rc_pace_to_cwnd = 1;
+ rack->rc_pace_fill_if_rttin_range = 0;
+ rack->rtt_limit_mul = 0;
+ /* noprr=1 */
+ rack->rack_no_prr = 1;
+ /* lscwnd=0 */
+ rack->r_limit_scw = 0;
+ }
+ break;
+ case TCP_SHARED_CWND_TIME_LIMIT:
+ RACK_OPTS_INC(tcp_lscwnd);
+ if (optval)
+ rack->r_limit_scw = 1;
+ else
+ rack->r_limit_scw = 0;
+ break;
+ case TCP_RACK_PACE_TO_FILL:
+ RACK_OPTS_INC(tcp_fillcw);
+ if (optval == 0)
+ rack->rc_pace_to_cwnd = 0;
+ else
+ rack->rc_pace_to_cwnd = 1;
+ if ((optval >= rack_gp_rtt_maxmul) &&
+ rack_gp_rtt_maxmul &&
+ (optval < 0xf)) {
+ rack->rc_pace_fill_if_rttin_range = 1;
+ rack->rtt_limit_mul = optval;
+ } else {
+ rack->rc_pace_fill_if_rttin_range = 0;
+ rack->rtt_limit_mul = 0;
+ }
+ break;
+ case TCP_RACK_NO_PUSH_AT_MAX:
+ RACK_OPTS_INC(tcp_npush);
+ if (optval == 0)
+ rack->r_ctl.rc_no_push_at_mrtt = 0;
+ else if (optval < 0xff)
+ rack->r_ctl.rc_no_push_at_mrtt = optval;
+ else
+ error = EINVAL;
+ break;
+ case TCP_SHARED_CWND_ENABLE:
+ RACK_OPTS_INC(tcp_rack_scwnd);
+ if (optval == 0)
+ rack->rack_enable_scwnd = 0;
+ else
+ rack->rack_enable_scwnd = 1;
+ break;
+ case TCP_RACK_MBUF_QUEUE:
+ /* Now do we use the LRO mbuf-queue feature */
+ RACK_OPTS_INC(tcp_rack_mbufq);
+ if (optval)
+ rack->r_mbuf_queue = 1;
+ else
+ rack->r_mbuf_queue = 0;
+ if (rack->r_mbuf_queue || rack->rc_always_pace)
+ tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ;
+ else
+ tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
+ break;
+ case TCP_RACK_NONRXT_CFG_RATE:
+ RACK_OPTS_INC(tcp_rack_cfg_rate);
+ if (optval == 0)
+ rack->rack_rec_nonrxt_use_cr = 0;
+ else
+ rack->rack_rec_nonrxt_use_cr = 1;
+ break;
+ case TCP_NO_PRR:
+ RACK_OPTS_INC(tcp_rack_noprr);
+ if (optval == 0)
+ rack->rack_no_prr = 0;
+ else
+ rack->rack_no_prr = 1;
+ break;
+ case TCP_TIMELY_DYN_ADJ:
+ RACK_OPTS_INC(tcp_timely_dyn);
+ if (optval == 0)
+ rack->rc_gp_dyn_mul = 0;
+ else {
+ rack->rc_gp_dyn_mul = 1;
+ if (optval >= 100) {
+ /*
+ * If the user sets something 100 or more
+ * its the gp_ca value.
+ */
+ rack->r_ctl.rack_per_of_gp_ca = optval;
+ }
+ }
+ break;
case TCP_RACK_DO_DETECTION:
RACK_OPTS_INC(tcp_rack_do_detection);
if (optval == 0)
@@ -10188,29 +14438,219 @@
RACK_OPTS_INC(tcp_rack_early_recov);
rack->r_ctl.rc_early_recovery = optval;
break;
+
+ /* Pacing related ones */
case TCP_RACK_PACE_ALWAYS:
- /* Use the always pace method (bool) */
+ /*
+ * zero is old rack method, 1 is new
+ * method using a pacing rate.
+ */
RACK_OPTS_INC(tcp_rack_pace_always);
if (optval > 0)
rack->rc_always_pace = 1;
else
rack->rc_always_pace = 0;
+ if (rack->r_mbuf_queue || rack->rc_always_pace)
+ tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ;
+ else
+ tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
+ /* A rate may be set irate or other, if so set seg size */
+ rack_update_seg(rack);
break;
- case TCP_RACK_PACE_REDUCE:
- /* RACK Hptsi reduction factor (divisor) */
- RACK_OPTS_INC(tcp_rack_pace_reduce);
+ case TCP_BBR_RACK_INIT_RATE:
+ RACK_OPTS_INC(tcp_initial_rate);
+ val = optval;
+ /* Change from kbits per second to bytes per second */
+ val *= 1000;
+ val /= 8;
+ rack->r_ctl.init_rate = val;
+ if (rack->rc_init_win != rack_default_init_window) {
+ uint32_t win, snt;
+
+ /*
+ * Options don't always get applied
+ * in the order you think. So in order
+ * to assure we update a cwnd we need
+ * to check and see if we are still
+ * where we should raise the cwnd.
+ */
+ win = rc_init_window(rack);
+ if (SEQ_GT(tp->snd_max, tp->iss))
+ snt = tp->snd_max - tp->iss;
+ else
+ snt = 0;
+ if ((snt < win) &&
+ (tp->snd_cwnd < win))
+ tp->snd_cwnd = win;
+ }
+ if (rack->rc_always_pace)
+ rack_update_seg(rack);
+ break;
+ case TCP_BBR_IWINTSO:
+ RACK_OPTS_INC(tcp_initial_win);
+ if (optval && (optval <= 0xff)) {
+ uint32_t win, snt;
+
+ rack->rc_init_win = optval;
+ win = rc_init_window(rack);
+ if (SEQ_GT(tp->snd_max, tp->iss))
+ snt = tp->snd_max - tp->iss;
+ else
+ snt = 0;
+ if ((snt < win) &&
+ (tp->t_srtt |
+#ifdef NETFLIX_PEAKRATE
+ tp->t_maxpeakrate |
+#endif
+ rack->r_ctl.init_rate)) {
+ /*
+ * We are not past the initial window
+ * and we have some bases for pacing,
+ * so we need to possibly adjust up
+ * the cwnd. Note even if we don't set
+ * the cwnd, its still ok to raise the rc_init_win
+ * which can be used coming out of idle when we
+ * would have a rate.
+ */
+ if (tp->snd_cwnd < win)
+ tp->snd_cwnd = win;
+ }
+ if (rack->rc_always_pace)
+ rack_update_seg(rack);
+ } else
+ error = EINVAL;
+ break;
+ case TCP_RACK_FORCE_MSEG:
+ RACK_OPTS_INC(tcp_rack_force_max_seg);
if (optval)
- /* Must be non-zero */
- rack->rc_pace_reduce = optval;
+ rack->rc_force_max_seg = 1;
else
- error = EINVAL;
+ rack->rc_force_max_seg = 0;
break;
case TCP_RACK_PACE_MAX_SEG:
- /* Max segments in a pace */
+ /* Max segments size in a pace in bytes */
RACK_OPTS_INC(tcp_rack_max_seg);
- rack->rc_pace_max_segs = optval;
- rack_set_pace_segments(tp, rack);
+ rack->rc_user_set_max_segs = optval;
+ rack_set_pace_segments(tp, rack, __LINE__);
break;
+ case TCP_RACK_PACE_RATE_REC:
+ /* Set the fixed pacing rate in Bytes per second ca */
+ RACK_OPTS_INC(tcp_rack_pace_rate_rec);
+ rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
+ if (rack->r_ctl.rc_fixed_pacing_rate_ca == 0)
+ rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
+ if (rack->r_ctl.rc_fixed_pacing_rate_ss == 0)
+ rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
+ rack->use_fixed_rate = 1;
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rc_fixed_pacing_rate_ss,
+ rack->r_ctl.rc_fixed_pacing_rate_ca,
+ rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
+ __LINE__, NULL);
+ break;
+
+ case TCP_RACK_PACE_RATE_SS:
+ /* Set the fixed pacing rate in Bytes per second ca */
+ RACK_OPTS_INC(tcp_rack_pace_rate_ss);
+ rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
+ if (rack->r_ctl.rc_fixed_pacing_rate_ca == 0)
+ rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
+ if (rack->r_ctl.rc_fixed_pacing_rate_rec == 0)
+ rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
+ rack->use_fixed_rate = 1;
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rc_fixed_pacing_rate_ss,
+ rack->r_ctl.rc_fixed_pacing_rate_ca,
+ rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
+ __LINE__, NULL);
+ break;
+
+ case TCP_RACK_PACE_RATE_CA:
+ /* Set the fixed pacing rate in Bytes per second ca */
+ RACK_OPTS_INC(tcp_rack_pace_rate_ca);
+ rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
+ if (rack->r_ctl.rc_fixed_pacing_rate_ss == 0)
+ rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
+ if (rack->r_ctl.rc_fixed_pacing_rate_rec == 0)
+ rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
+ rack->use_fixed_rate = 1;
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rc_fixed_pacing_rate_ss,
+ rack->r_ctl.rc_fixed_pacing_rate_ca,
+ rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
+ __LINE__, NULL);
+ break;
+ case TCP_RACK_GP_INCREASE_REC:
+ RACK_OPTS_INC(tcp_gp_inc_rec);
+ rack->r_ctl.rack_per_of_gp_rec = optval;
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rack_per_of_gp_ss,
+ rack->r_ctl.rack_per_of_gp_ca,
+ rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
+ __LINE__, NULL);
+ break;
+ case TCP_RACK_GP_INCREASE_CA:
+ RACK_OPTS_INC(tcp_gp_inc_ca);
+ ca = optval;
+ if (ca < 100) {
+ /*
+ * We don't allow any reduction
+ * over the GP b/w.
+ */
+ error = EINVAL;
+ break;
+ }
+ rack->r_ctl.rack_per_of_gp_ca = ca;
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rack_per_of_gp_ss,
+ rack->r_ctl.rack_per_of_gp_ca,
+ rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
+ __LINE__, NULL);
+ break;
+ case TCP_RACK_GP_INCREASE_SS:
+ RACK_OPTS_INC(tcp_gp_inc_ss);
+ ss = optval;
+ if (ss < 100) {
+ /*
+ * We don't allow any reduction
+ * over the GP b/w.
+ */
+ error = EINVAL;
+ break;
+ }
+ rack->r_ctl.rack_per_of_gp_ss = ss;
+ rack_log_pacing_delay_calc(rack,
+ rack->r_ctl.rack_per_of_gp_ss,
+ rack->r_ctl.rack_per_of_gp_ca,
+ rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
+ __LINE__, NULL);
+ break;
+ case TCP_RACK_RR_CONF:
+ RACK_OPTS_INC(tcp_rack_rrr_no_conf_rate);
+ if (optval && optval <= 3)
+ rack->r_rr_config = optval;
+ else
+ rack->r_rr_config = 0;
+ break;
+ case TCP_BBR_HDWR_PACE:
+ RACK_OPTS_INC(tcp_hdwr_pacing);
+ if (optval){
+ if (rack->rack_hdrw_pacing == 0) {
+ rack->rack_hdw_pace_ena = 1;
+ rack->rack_attempt_hdwr_pace = 0;
+ } else
+ error = EALREADY;
+ } else {
+ rack->rack_hdw_pace_ena = 0;
+#ifdef RATELIMIT
+ if (rack->rack_hdrw_pacing) {
+ rack->rack_hdrw_pacing = 0;
+ in_pcbdetach_txrtlmt(rack->rc_inp);
+ }
+#endif
+ }
+ break;
+ /* End Pacing related ones */
case TCP_RACK_PRR_SENDALOT:
/* Allow PRR to send more than one seg */
RACK_OPTS_INC(tcp_rack_prr_sendalot);
@@ -10247,12 +14687,12 @@
else
error = EINVAL;
break;
- case TCP_BBR_USE_RACK_CHEAT:
- RACK_OPTS_INC(tcp_rack_cheat);
+ case TCP_BBR_USE_RACK_RR:
+ RACK_OPTS_INC(tcp_rack_rr);
if (optval)
- rack->use_rack_cheat = 1;
+ rack->use_rack_rr = 1;
else
- rack->use_rack_cheat = 0;
+ rack->use_rack_rr = 0;
break;
case TCP_RACK_PKT_DELAY:
/* RACK added ms i.e. rack-rtt + reord + N */
@@ -10274,26 +14714,10 @@
if (tp->t_flags & TF_DELACK) {
tp->t_flags &= ~TF_DELACK;
tp->t_flags |= TF_ACKNOW;
- NET_EPOCH_ENTER(et);
rack_output(tp);
- NET_EPOCH_EXIT(et);
}
break;
- case TCP_RACK_MIN_PACE:
- RACK_OPTS_INC(tcp_rack_min_pace);
- if (optval > 3)
- rack->r_enforce_min_pace = 3;
- else
- rack->r_enforce_min_pace = optval;
- break;
- case TCP_RACK_GP_INCREASE:
- if ((optval >= 0) &&
- (optval <= 256))
- rack->rack_per_of_gp = optval;
- else
- error = EINVAL;
- break;
case TCP_BBR_RACK_RTT_USE:
if ((optval != USE_RTT_HIGH) &&
(optval != USE_RTT_LOW) &&
@@ -10308,6 +14732,10 @@
else
rack->rc_allow_data_af_clo = 0;
break;
+ case TCP_RACK_PACE_REDUCE:
+ /* sysctl only now */
+ error = EINVAL;
+ break;
default:
return (tcp_default_ctloutput(so, sopt, inp, tp));
break;
@@ -10324,7 +14752,7 @@
struct inpcb *inp, struct tcpcb *tp, struct tcp_rack *rack)
{
int32_t error, optval;
-
+ uint64_t val;
/*
* 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
@@ -10333,10 +14761,38 @@
*/
error = 0;
switch (sopt->sopt_name) {
+ case TCP_RACK_PROFILE:
+ /* You cannot retrieve a profile, its write only */
+ error = EINVAL;
+ break;
+ case TCP_RACK_PACE_TO_FILL:
+ optval = rack->rc_pace_to_cwnd;
+ break;
+ case TCP_RACK_NO_PUSH_AT_MAX:
+ optval = rack->r_ctl.rc_no_push_at_mrtt;
+ break;
+ case TCP_SHARED_CWND_ENABLE:
+ optval = rack->rack_enable_scwnd;
+ break;
+ case TCP_RACK_NONRXT_CFG_RATE:
+ optval = rack->rack_rec_nonrxt_use_cr;
+ break;
+ case TCP_NO_PRR:
+ optval = rack->rack_no_prr;
+ break;
case TCP_RACK_DO_DETECTION:
optval = rack->do_detection;
break;
-
+ case TCP_RACK_MBUF_QUEUE:
+ /* Now do we use the LRO mbuf-queue feature */
+ optval = rack->r_mbuf_queue;
+ break;
+ case TCP_TIMELY_DYN_ADJ:
+ optval = rack->rc_gp_dyn_mul;
+ break;
+ case TCP_BBR_IWINTSO:
+ optval = rack->rc_init_win;
+ break;
case TCP_RACK_PROP_RATE:
optval = rack->r_ctl.rc_prop_rate;
break;
@@ -10354,11 +14810,21 @@
break;
case TCP_RACK_PACE_REDUCE:
/* RACK Hptsi reduction factor (divisor) */
- optval = rack->rc_pace_reduce;
+ error = EINVAL;
break;
+ case TCP_BBR_RACK_INIT_RATE:
+ val = rack->r_ctl.init_rate;
+ /* convert to kbits per sec */
+ val *= 8;
+ val /= 1000;
+ optval = (uint32_t)val;
+ break;
+ case TCP_RACK_FORCE_MSEG:
+ optval = rack->rc_force_max_seg;
+ break;
case TCP_RACK_PACE_MAX_SEG:
/* Max segments in a pace */
- optval = rack->rc_pace_max_segs;
+ optval = rack->rc_user_set_max_segs;
break;
case TCP_RACK_PACE_ALWAYS:
/* Use the always pace method */
@@ -10384,10 +14850,16 @@
/* Does reordering fade after ms time */
optval = rack->r_ctl.rc_reorder_fade;
break;
- case TCP_BBR_USE_RACK_CHEAT:
+ case TCP_BBR_USE_RACK_RR:
/* Do we use the rack cheat for rxt */
- optval = rack->use_rack_cheat;
+ optval = rack->use_rack_rr;
break;
+ case TCP_RACK_RR_CONF:
+ optval = rack->r_rr_config;
+ break;
+ case TCP_BBR_HDWR_PACE:
+ optval = rack->rack_hdw_pace_ena;
+ break;
case TCP_RACK_TLP_THRESH:
/* RACK TLP theshold i.e. srtt+(srtt/N) */
optval = rack->r_ctl.rc_tlp_threshold;
@@ -10406,12 +14878,21 @@
case TCP_RACK_IDLE_REDUCE_HIGH:
error = EINVAL;
break;
- case TCP_RACK_MIN_PACE:
- optval = rack->r_enforce_min_pace;
+ case TCP_RACK_PACE_RATE_CA:
+ optval = rack->r_ctl.rc_fixed_pacing_rate_ca;
break;
- case TCP_RACK_GP_INCREASE:
- optval = rack->rack_per_of_gp;
+ case TCP_RACK_PACE_RATE_SS:
+ optval = rack->r_ctl.rc_fixed_pacing_rate_ss;
break;
+ case TCP_RACK_PACE_RATE_REC:
+ optval = rack->r_ctl.rc_fixed_pacing_rate_rec;
+ break;
+ case TCP_RACK_GP_INCREASE_SS:
+ optval = rack->r_ctl.rack_per_of_gp_ca;
+ break;
+ case TCP_RACK_GP_INCREASE_CA:
+ optval = rack->r_ctl.rack_per_of_gp_ss;
+ break;
case TCP_BBR_RACK_RTT_USE:
optval = rack->r_ctl.rc_rate_sample_method;
break;
@@ -10421,6 +14902,9 @@
case TCP_DATA_AFTER_CLOSE:
optval = rack->rc_allow_data_af_clo;
break;
+ case TCP_SHARED_CWND_TIME_LIMIT:
+ optval = rack->r_limit_scw;
+ break;
default:
return (tcp_default_ctloutput(so, sopt, inp, tp));
break;
Index: rack_bbr_common.h
===================================================================
--- rack_bbr_common.h
+++ rack_bbr_common.h
@@ -1,7 +1,7 @@
#ifndef __rack_bbr_common_h__
#define __rack_bbr_common_h__
/*-
- * Copyright (c) 2017-9 Netflix, Inc.
+ * Copyright (c) 2016-20 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -80,7 +80,7 @@
/* 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 TWENTY_THREE_MBPS 2896000 /* 23 megabits in bytes */
#define FIVETWELVE_MBPS 64000000 /* 512 megabits in bytes */
#define ONE_POINT_TWO_MEG 150000 /* 1.2 megabits in bytes */
@@ -138,5 +138,8 @@
uint32_t
ctf_decay_count(uint32_t count, uint32_t decay_percentage);
+int32_t
+ctf_progress_timeout_check(struct tcpcb *tp, bool log);
+
#endif
#endif
Index: rack_bbr_common.c
===================================================================
--- rack_bbr_common.c
+++ rack_bbr_common.c
@@ -1,7 +1,5 @@
/*-
- * Copyright (c) 2016-9
- * Netflix Inc.
- * All rights reserved.
+ * Copyright (c) 2016-20 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -423,6 +421,7 @@
nxt_pkt = 1;
else
nxt_pkt = 0;
+ KMOD_TCPSTAT_INC(tcps_rcvtotal);
retval = (*tp->t_fb->tfb_do_segment_nounlock)(m, th, so, tp, drop_hdrlen, tlen,
iptos, nxt_pkt, &tv);
if (retval) {
@@ -694,6 +693,7 @@
tcp_state_change(tp, TCPS_CLOSED);
/* FALLTHROUGH */
default:
+ tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_RST);
tp = tcp_close(tp);
}
dropped = 1;
@@ -911,3 +911,24 @@
decayed_count = count - (uint32_t)perc_count;
return(decayed_count);
}
+
+int32_t
+ctf_progress_timeout_check(struct tcpcb *tp, bool log)
+{
+ if (tp->t_maxunacktime && tp->t_acktime && TSTMP_GT(ticks, tp->t_acktime)) {
+ if ((ticks - tp->t_acktime) >= tp->t_maxunacktime) {
+ /*
+ * There is an assumption that the caller
+ * will drop the connection so we will
+ * increment the counters here.
+ */
+ if (log)
+ tcp_log_end_status(tp, TCP_EI_STATUS_PROGRESS);
+#ifdef NETFLIX_STATS
+ KMOD_TCPSTAT_INC(tcps_progdrops);
+#endif
+ return (1);
+ }
+ }
+ return (0);
+}
Index: tcp_bbr.h
===================================================================
--- tcp_bbr.h
+++ tcp_bbr.h
@@ -1,7 +1,5 @@
/*-
- * Copyright (c) 2016-9
- * Netflix Inc. All rights reserved.
- * Author Randall R. Stewart
+ * Copyright (c) 2016-20 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
Index: tcp_rack.h
===================================================================
--- tcp_rack.h
+++ tcp_rack.h
@@ -1,5 +1,5 @@
/*-
- * Copyright (c) 2016-9 Netflix, Inc.
+ * Copyright (c) 2016-20 Netflix, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -37,10 +37,14 @@
#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_APP_LIMITED 0x0200/* We went app limited after this send */
+#define RACK_WAS_ACKED 0x0400/* a RTO undid the ack, but it already had a rtt calc done */
#define RACK_NUM_OF_RETRANS 3
#define RACK_INITIAL_RTO 1000 /* 1 second in milli seconds */
+#define RACK_REQ_AVG 4 /* Must be less than 256 */
+
struct rack_sendmap {
uint32_t r_start; /* Sequence number of the segment */
uint32_t r_end; /* End seq, this is 1 beyond actually */
@@ -51,10 +55,16 @@
* sent */
uint16_t r_flags; /* Flags as defined above */
uint32_t r_tim_lastsent[RACK_NUM_OF_RETRANS];
+ uint32_t usec_orig_send; /* time of orginal send in useconds */
+ uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */
+ uint32_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */
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[49];
+ uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */
+ r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */
+ r_avail : 6;
+ uint8_t r_resv[36];
};
RB_HEAD(rack_rb_tree_head, rack_sendmap);
@@ -76,7 +86,10 @@
uint32_t rs_rtt_lowest;
uint32_t rs_rtt_highest;
uint32_t rs_rtt_cnt;
+ uint32_t rs_us_rtt;
+ int32_t confidence;
uint64_t rs_rtt_tot;
+ uint16_t rs_us_rtrcnt;
};
#define RACK_LOG_TYPE_ACK 0x01
@@ -135,15 +148,57 @@
uint64_t tcp_rack_idle_reduce_high;
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_pace_rate_ca;
+ uint64_t tcp_rack_rr;
uint64_t tcp_rack_do_detection;
+ uint64_t tcp_rack_rrr_no_conf_rate;
+ uint64_t tcp_initial_rate;
+ uint64_t tcp_initial_win;
+ uint64_t tcp_hdwr_pacing;
+ uint64_t tcp_gp_inc_ss;
+ uint64_t tcp_gp_inc_ca;
+ uint64_t tcp_gp_inc_rec;
+ uint64_t tcp_rack_force_max_seg;
+ uint64_t tcp_rack_pace_rate_ss;
+ uint64_t tcp_rack_pace_rate_rec;
+ /* Temp counters for dsack */
+ uint64_t tcp_sack_path_1;
+ uint64_t tcp_sack_path_2a;
+ uint64_t tcp_sack_path_2b;
+ uint64_t tcp_sack_path_3;
+ uint64_t tcp_sack_path_4;
+ /* non temp counters */
+ uint64_t tcp_rack_scwnd;
+ uint64_t tcp_rack_noprr;
+ uint64_t tcp_rack_cfg_rate;
+ uint64_t tcp_timely_dyn;
+ uint64_t tcp_rack_mbufq;
+ uint64_t tcp_fillcw;
+ uint64_t tcp_npush;
+ uint64_t tcp_lscwnd;
+ uint64_t tcp_profile;
};
+/* RTT shrink reasons */
+#define RACK_RTTS_INIT 0
+#define RACK_RTTS_NEWRTT 1
+#define RACK_RTTS_EXITPROBE 2
+#define RACK_RTTS_ENTERPROBE 3
+#define RACK_RTTS_REACHTARGET 4
+#define RACK_RTTS_SEEHBP 5
+#define RACK_RTTS_NOBACKOFF 6
+#define RACK_RTTS_SAFETY 7
+
+#define RACK_USE_BEG 1
+#define RACK_USE_END 2
+#define RACK_USE_END_OR_THACK 3
+
#define TLP_USE_ID 1 /* Internet draft behavior */
#define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */
#define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */
+#define RACK_MIN_BW 8000 /* 64kbps in Bps */
+#define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */
#ifdef _KERNEL
#define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t))
extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE];
@@ -200,10 +255,13 @@
* 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_fixed_pacing_rate_ca;
+ uint32_t rc_fixed_pacing_rate_rec;
+ uint32_t rc_fixed_pacing_rate_ss;
+ uint32_t cwnd_to_use; /* The cwnd in use */
uint32_t rc_timer_exp; /* If a timer ticks of expiry */
uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */
uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */
@@ -223,15 +281,14 @@
uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */
uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */
- uint32_t rc_last_tlp_seq; /* Last tlp sequence Lock(a) */
+ uint32_t xxx_rc_last_tlp_seq; /* Last tlp sequence Lock(a) */
uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */
- uint16_t rc_tlp_send_cnt; /* Number of TLP sends we have done
- * since peer spoke to us Lock(a) */
- uint16_t rc_tlp_seg_send_cnt; /* Number of times we have TLP sent
+ uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */
+ uint16_t xxx_rc_tlp_seg_send_cnt; /* Number of times we have TLP sent
* rc_last_tlp_seq Lock(a) */
- uint32_t rc_loss_count; /* During recovery how many segments were lost
+ uint32_t rc_loss_count; /* How many bytes have been retransmitted
* Lock(a) */
uint32_t rc_reorder_fade; /* Socket option value Lock(a) */
@@ -260,13 +317,20 @@
struct rack_sendmap *rc_rsm_at_retran; /* Debug variable kept for
* cache line alignment
* Lock(a) */
- struct timeval rc_last_ack;
+ struct rack_sendmap *rc_first_appl; /* Pointer to first app limited */
+ struct rack_sendmap *rc_end_appl; /* Pointer to last app limited */
/* Cache line split 0x100 */
struct sack_filter rack_sf;
/* Cache line split 0x140 */
/* Flags for various things */
+ uint32_t last_pacing_time;
uint32_t rc_pace_max_segs;
uint32_t rc_pace_min_segs;
+ uint32_t rc_app_limited_cnt;
+ uint16_t rack_per_of_gp_ss; /* 100 = 100%, so from 65536 = 655 x bw */
+ uint16_t rack_per_of_gp_ca; /* 100 = 100%, so from 65536 = 655 x bw */
+ uint16_t rack_per_of_gp_rec; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */
+ uint16_t rack_per_of_gp_probertt; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */
uint32_t rc_high_rwnd;
uint32_t ack_count;
uint32_t sack_count;
@@ -273,13 +337,48 @@
uint32_t sack_noextra_move;
uint32_t sack_moved_extra;
struct rack_rtt_sample rack_rs;
+ const struct tcp_hwrate_limit_table *crte;
+ uint32_t rc_agg_early;
+ uint32_t rc_agg_delayed;
uint32_t rc_tlp_rxt_last_time;
uint32_t rc_saved_cwnd;
- uint32_t rc_gp_history[RACK_GP_HIST];
+ uint32_t rc_gp_output_ts;
+ uint32_t rc_gp_cumack_ts;
+ struct timeval act_rcv_time;
+ struct timeval rc_last_time_decay; /* SAD time decay happened here */
+ uint64_t gp_bw;
+ uint64_t init_rate;
+#ifdef NETFLIX_SHARED_CWND
+ struct shared_cwnd *rc_scw;
+#endif
+ uint64_t last_gp_comp_bw;
+ uint64_t last_max_bw; /* Our calculated max b/w last */
+ struct time_filter_small rc_gp_min_rtt;
+ int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */
+ uint32_t rc_gp_srtt; /* Current GP srtt */
+ uint32_t rc_prev_gp_srtt; /* Previous RTT */
+ uint32_t rc_entry_gp_rtt; /* Entry to PRTT gp-rtt */
+ uint32_t rc_loss_at_start; /* At measurement window where was our lost value */
+
+ uint32_t forced_ack_ts;
+ uint32_t rc_lower_rtt_us_cts; /* Time our GP rtt was last lowered */
+ uint32_t rc_time_probertt_entered;
+ uint32_t rc_time_probertt_starts;
+ uint32_t rc_lowest_us_rtt;
+ uint32_t rc_highest_us_rtt;
+ uint32_t rc_last_us_rtt;
+ uint32_t rc_time_of_last_probertt;
+ uint32_t rc_target_probertt_flight;
+ uint32_t rc_probertt_sndmax_atexit; /* Highest sent to in probe-rtt */
+ uint32_t rc_gp_lowrtt; /* Lowest rtt seen during GPUT measurement */
+ uint32_t rc_gp_high_rwnd; /* Highest rwnd seen during GPUT measurement */
+ int32_t rc_scw_index;
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) */
uint16_t rc_pkt_delay; /* Socket option value Lock(a) */
+ uint8_t rc_no_push_at_mrtt; /* No push when we exceed max rtt */
+ uint8_t num_avg; /* average count before we go to normal decay */
uint8_t rc_prop_rate; /* Socket option value Lock(a) */
uint8_t rc_prop_reduce; /* Socket option value Lock(a) */
uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */
@@ -286,13 +385,13 @@
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_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;
-
+ uint8_t rc_gp_hist_idx;
};
+#define RACK_TIMELY_CNT_BOOST 5 /* At 5th increase boost */
+#define RACK_MINRTT_FILTER_TIM 10 /* Seconds */
+
#ifdef _KERNEL
struct tcp_rack {
@@ -306,39 +405,75 @@
uint32_t rc_free_cnt; /* Number of free entries on the rc_free list
* Lock(a) */
uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */
- uint16_t r_wanted_output; /* Output routine wanted to be called */
- uint16_t r_cpu; /* CPU that the INP is running on Lock(a) */
- uint16_t rc_pace_max_segs; /* Socket option value Lock(a) */
- uint16_t rc_pace_reduce;/* Socket option value Lock(a) */
+ uint16_t r_mbuf_queue : 1, /* Do we do mbuf queue for non-paced */
+ rtt_limit_mul : 4, /* muliply this by low rtt */
+ r_limit_scw : 1,
+ r_avail_bits : 10; /* Available */
+ uint16_t rc_user_set_max_segs; /* Socket option value Lock(a) */
+ uint16_t forced_ack : 1,
+ rc_gp_incr : 1,
+ rc_gp_bwred : 1,
+ rc_gp_timely_inc_cnt : 3,
+ rc_gp_timely_dec_cnt : 3,
+ rc_not_backing_off: 1,
+ rc_highly_buffered: 1, /* The path is highly buffered */
+ rc_dragged_bottom: 1,
+ rc_dack_mode : 1, /* Mac O/S emulation of d-ack */
+ rc_dack_toggle : 1, /* For Mac O/S emulation of d-ack */
+ pacing_longer_than_rtt : 1,
+ rc_gp_filled : 1;
uint8_t r_state; /* Current rack state Lock(a) */
uint8_t rc_tmr_stopped : 7,
t_timers_stopped : 1;
- uint8_t rc_enobuf; /* count of enobufs on connection provides
- * backoff Lock(a) */
+ uint8_t rc_enobuf : 7, /* count of enobufs on connection provides */
+ rc_on_min_to : 1;
uint8_t r_timer_override : 1, /* hpts override Lock(a) */
- r_tlp_running : 1, /* Running from a TLP timeout Lock(a) */
r_is_v6 : 1, /* V6 pcb Lock(a) */
rc_in_persist : 1,
- rc_last_pto_set : 1, /* XXX not used */
rc_tlp_in_progress : 1,
rc_always_pace : 1, /* Socket option value Lock(a) */
- tlp_timer_up : 1; /* The tlp timer is up flag Lock(a) */
- uint8_t r_enforce_min_pace : 2,
+ rc_pace_to_cwnd : 1,
+ rc_pace_fill_if_rttin_range : 1,
+ xxx_avail_bits : 1;
+ uint8_t app_limited_needs_set : 1,
+ use_fixed_rate : 1,
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;
+ rack_hdrw_pacing : 1, /* We are doing Hardware pacing */
+ rack_hdw_pace_ena : 1, /* Is hardware pacing enabled? */
+ rack_attempt_hdwr_pace : 1; /* Did we attempt hdwr pacing (if allowed) */
+ uint8_t rack_tlp_threshold_use : 3, /* only 1, 2 and 3 used so far */
+ rack_rec_nonrxt_use_cr : 1,
+ rack_enable_scwnd : 1,
+ rack_attempted_scwnd : 1,
+ rack_no_prr : 1,
+ rack_scwnd_is_idle : 1;
uint8_t rc_allow_data_af_clo: 1,
delayed_ack : 1,
set_pacing_done_a_iw : 1,
- use_rack_cheat : 1,
+ use_rack_rr : 1,
alloc_limit_reported : 1,
sack_attack_disable : 1,
do_detection : 1,
- rc_avail : 1;
- uint16_t rack_per_of_gp;
+ rc_force_max_seg : 1;
+ uint8_t rack_cwnd_limited : 1,
+ r_early : 1,
+ r_late : 1,
+ r_running_early : 1,
+ r_running_late : 1,
+ r_wanted_output: 1,
+ r_rr_config : 2;
+ uint16_t rc_init_win : 8,
+ rc_gp_rtt_set : 1,
+ rc_gp_dyn_mul : 1,
+ rc_gp_saw_rec : 1,
+ rc_gp_saw_ca : 1,
+ rc_gp_saw_ss : 1,
+ rc_gp_no_rec_chg : 1,
+ in_probe_rtt : 1,
+ measure_saw_probe_rtt : 1;
/* Cache line 2 0x40 */
struct rack_control r_ctl;
} __aligned(CACHE_LINE_SIZE);

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