Differential D21127 Diff 61734 head/sys/netinet/tcp_lro.c

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head/sys/netinet/tcp_lro.c

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#include "opt_inet6.h"		#include "opt_inet6.h"

#include <sys/param.h>		#include <sys/param.h>
#include <sys/systm.h>		#include <sys/systm.h>
#include <sys/kernel.h>		#include <sys/kernel.h>
#include <sys/malloc.h>		#include <sys/malloc.h>
#include <sys/mbuf.h>		#include <sys/mbuf.h>
#include <sys/socket.h>		#include <sys/socket.h>
		#include <sys/socketvar.h>
		#include <sys/sockbuf.h>
#include <sys/sysctl.h>		#include <sys/sysctl.h>

#include <net/if.h>		#include <net/if.h>
#include <net/if_var.h>		#include <net/if_var.h>
#include <net/ethernet.h>		#include <net/ethernet.h>
#include <net/vnet.h>		#include <net/vnet.h>

#include <netinet/in_systm.h>		#include <netinet/in_systm.h>
#include <netinet/in.h>		#include <netinet/in.h>
#include <netinet/ip6.h>		#include <netinet/ip6.h>
#include <netinet/ip.h>		#include <netinet/ip.h>
#include <netinet/ip_var.h>		#include <netinet/ip_var.h>
		#include <netinet/in_pcb.h>
		#include <netinet6/in6_pcb.h>
#include <netinet/tcp.h>		#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>		#include <netinet/tcp_seq.h>
#include <netinet/tcp_lro.h>		#include <netinet/tcp_lro.h>
#include <netinet/tcp_var.h>		#include <netinet/tcp_var.h>
		#include <netinet/tcp_hpts.h>
		#include <netinet/tcp_log_buf.h>
#include <netinet6/ip6_var.h>		#include <netinet6/ip6_var.h>

#include <machine/in_cksum.h>		#include <machine/in_cksum.h>

static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures");		static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures");

#define TCP_LRO_UPDATE_CSUM 1		#define TCP_LRO_UPDATE_CSUM 1
#ifndef TCP_LRO_UPDATE_CSUM		#ifndef TCP_LRO_UPDATE_CSUM
#define TCP_LRO_INVALID_CSUM 0x0000		#define TCP_LRO_INVALID_CSUM 0x0000
#endif		#endif

static void tcp_lro_rx_done(struct lro_ctrl *lc);		static void tcp_lro_rx_done(struct lro_ctrl *lc);
static int tcp_lro_rx2(struct lro_ctrl lc, struct mbuf m,		static int tcp_lro_rx2(struct lro_ctrl lc, struct mbuf m,
uint32_t csum, int use_hash);		uint32_t csum, int use_hash);

SYSCTL_NODE(_net_inet_tcp, OID_AUTO, lro, CTLFLAG_RW \| CTLFLAG_MPSAFE, 0,		SYSCTL_NODE(_net_inet_tcp, OID_AUTO, lro, CTLFLAG_RW \| CTLFLAG_MPSAFE, 0,
"TCP LRO");		"TCP LRO");

		static long tcplro_stacks_wanting_mbufq = 0;
		counter_u64_t tcp_inp_lro_direct_queue;
		counter_u64_t tcp_inp_lro_wokeup_queue;
		counter_u64_t tcp_inp_lro_compressed;
		counter_u64_t tcp_inp_lro_single_push;
		counter_u64_t tcp_inp_lro_locks_taken;
		counter_u64_t tcp_inp_lro_sack_wake;

static unsigned tcp_lro_entries = TCP_LRO_ENTRIES;		static unsigned tcp_lro_entries = TCP_LRO_ENTRIES;
		static int32_t hold_lock_over_compress = 0;
		SYSCTL_INT(_net_inet_tcp_lro, OID_AUTO, hold_lock, CTLFLAG_RW,
		&hold_lock_over_compress, 0,
		"Do we hold the lock over the compress of mbufs?");
SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, entries,		SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, entries,
CTLFLAG_RDTUN \| CTLFLAG_MPSAFE, &tcp_lro_entries, 0,		CTLFLAG_RDTUN \| CTLFLAG_MPSAFE, &tcp_lro_entries, 0,
"default number of LRO entries");		"default number of LRO entries");
		SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, fullqueue, CTLFLAG_RD,
		&tcp_inp_lro_direct_queue, "Number of lro's fully queued to transport");
		SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, wokeup, CTLFLAG_RD,
		&tcp_inp_lro_wokeup_queue, "Number of lro's where we woke up transport via hpts");
		SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, compressed, CTLFLAG_RD,
		&tcp_inp_lro_compressed, "Number of lro's compressed and sent to transport");
		SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, single, CTLFLAG_RD,
		&tcp_inp_lro_single_push, "Number of lro's sent with single segment");
		SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lockcnt, CTLFLAG_RD,
		&tcp_inp_lro_locks_taken, "Number of lro's inp_wlocks taken");
		SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, sackwakeups, CTLFLAG_RD,
		&tcp_inp_lro_sack_wake, "Number of wakeups caused by sack/fin");

		void
		tcp_lro_reg_mbufq(void)
		{
		atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, 1);
		}

		void
		tcp_lro_dereg_mbufq(void)
		{
		atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, -1);
		}

static __inline void		static __inline void
tcp_lro_active_insert(struct lro_ctrl lc, struct lro_head bucket,		tcp_lro_active_insert(struct lro_ctrl lc, struct lro_head bucket,
struct lro_entry *le)		struct lro_entry *le)
{		{

LIST_INSERT_HEAD(&lc->lro_active, le, next);		LIST_INSERT_HEAD(&lc->lro_active, le, next);
LIST_INSERT_HEAD(bucket, le, hash_next);		LIST_INSERT_HEAD(bucket, le, hash_next);
}		}
▲ Show 20 Lines • Show All 62 Lines • ▼ Show 20 Lines	tcp_lro_init_args(struct lro_ctrl lc, struct ifnet ifp,

/* setup linked list */		/* setup linked list */
for (i = 0; i != lro_entries; i++)		for (i = 0; i != lro_entries; i++)
LIST_INSERT_HEAD(&lc->lro_free, le + i, next);		LIST_INSERT_HEAD(&lc->lro_free, le + i, next);

return (0);		return (0);
}		}

		static struct tcphdr *
		tcp_lro_get_th(struct lro_entry le, struct mbuf m)
		{
		struct ether_header *eh;
		struct tcphdr *th = NULL;
		#ifdef INET6
		struct ip6_hdr ip6 = NULL; / Keep compiler happy. */
		#endif
		#ifdef INET
		struct ip ip4 = NULL; / Keep compiler happy. */
		#endif

		eh = mtod(m, struct ether_header *);
		switch (le->eh_type) {
		#ifdef INET6
		case ETHERTYPE_IPV6:
		ip6 = (struct ip6_hdr *)(eh + 1);
		th = (struct tcphdr *)(ip6 + 1);
		break;
		#endif
		#ifdef INET
		case ETHERTYPE_IP:
		ip4 = (struct ip *)(eh + 1);
		th = (struct tcphdr *)(ip4 + 1);
		break;
		#endif
		}
		return (th);
		}

void		void
tcp_lro_free(struct lro_ctrl *lc)		tcp_lro_free(struct lro_ctrl *lc)
{		{
struct lro_entry *le;		struct lro_entry *le;
unsigned x;		unsigned x;

/* reset LRO free list */		/* reset LRO free list */
LIST_INIT(&lc->lro_free);		LIST_INIT(&lc->lro_free);
Show All 14 Lines	for (x = 0; x != lc->lro_mbuf_count; x++)
m_freem(lc->lro_mbuf_data[x].mb);		m_freem(lc->lro_mbuf_data[x].mb);
lc->lro_mbuf_count = 0;		lc->lro_mbuf_count = 0;

/* free allocated memory, if any */		/* free allocated memory, if any */
free(lc->lro_mbuf_data, M_LRO);		free(lc->lro_mbuf_data, M_LRO);
lc->lro_mbuf_data = NULL;		lc->lro_mbuf_data = NULL;
}		}

#ifdef TCP_LRO_UPDATE_CSUM
static uint16_t		static uint16_t
tcp_lro_csum_th(struct tcphdr *th)		tcp_lro_csum_th(struct tcphdr *th)
{		{
uint32_t ch;		uint32_t ch;
uint16_t *p, l;		uint16_t *p, l;

ch = th->th_sum = 0x0000;		ch = th->th_sum = 0x0000;
l = th->th_off;		l = th->th_off;
▲ Show 20 Lines • Show All 66 Lines • ▼ Show 20 Lines	#endif
/* Remove TCP header csum. */		/* Remove TCP header csum. */
cs = ~tcp_lro_csum_th(th);		cs = ~tcp_lro_csum_th(th);
c += cs;		c += cs;
while (c > 0xffff)		while (c > 0xffff)
c = (c >> 16) + (c & 0xffff);		c = (c >> 16) + (c & 0xffff);

return (c & 0xffff);		return (c & 0xffff);
}		}
#endif

static void		static void
tcp_lro_rx_done(struct lro_ctrl *lc)		tcp_lro_rx_done(struct lro_ctrl *lc)
{		{
struct lro_entry *le;		struct lro_entry *le;

while ((le = LIST_FIRST(&lc->lro_active)) != NULL) {		while ((le = LIST_FIRST(&lc->lro_active)) != NULL) {
tcp_lro_active_remove(le);		tcp_lro_active_remove(le);
tcp_lro_flush(lc, le);		tcp_lro_flush(lc, le);
}		}
}		}

void		void
tcp_lro_flush_inactive(struct lro_ctrl lc, const struct timeval timeout)		tcp_lro_flush_inactive(struct lro_ctrl lc, const struct timeval timeout)
{		{
struct lro_entry le, le_tmp;		struct lro_entry le, le_tmp;
struct timeval tv;		struct timeval tv;

if (LIST_EMPTY(&lc->lro_active))		if (LIST_EMPTY(&lc->lro_active))
return;		return;

getmicrotime(&tv);		getmicrouptime(&tv);
timevalsub(&tv, timeout);		timevalsub(&tv, timeout);
LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) {		LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) {
if (timevalcmp(&tv, &le->mtime, >=)) {		if (timevalcmp(&tv, &le->mtime, >=)) {
tcp_lro_active_remove(le);		tcp_lro_active_remove(le);
tcp_lro_flush(lc, le);		tcp_lro_flush(lc, le);
}		}
}		}
}		}

void		#ifdef INET6
tcp_lro_flush(struct lro_ctrl lc, struct lro_entry le)		static int
		tcp_lro_rx_ipv6(struct lro_ctrl lc, struct mbuf m, struct ip6_hdr *ip6,
		struct tcphdr **th)
{		{

if (le->append_cnt > 0) {		/* XXX-BZ we should check the flow-label. */

		/* XXX-BZ We do not yet support ext. hdrs. */
		if (ip6->ip6_nxt != IPPROTO_TCP)
		return (TCP_LRO_NOT_SUPPORTED);

		/* Find the TCP header. */
		th = (struct tcphdr )(ip6 + 1);

		return (0);
		}
		#endif

		#ifdef INET
		static int
		tcp_lro_rx_ipv4(struct lro_ctrl lc, struct mbuf m, struct ip *ip4,
		struct tcphdr **th)
		{
		int csum_flags;
		uint16_t csum;

		if (ip4->ip_p != IPPROTO_TCP)
		return (TCP_LRO_NOT_SUPPORTED);

		/* Ensure there are no options. */
		if ((ip4->ip_hl << 2) != sizeof (*ip4))
		return (TCP_LRO_CANNOT);

		/* .. and the packet is not fragmented. */
		if (ip4->ip_off & htons(IP_MF\|IP_OFFMASK))
		return (TCP_LRO_CANNOT);

		/* Legacy IP has a header checksum that needs to be correct. */
		csum_flags = m->m_pkthdr.csum_flags;
		if (csum_flags & CSUM_IP_CHECKED) {
		if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) {
		lc->lro_bad_csum++;
		return (TCP_LRO_CANNOT);
		}
		} else {
		csum = in_cksum_hdr(ip4);
		if (__predict_false((csum) != 0)) {
		lc->lro_bad_csum++;
		return (TCP_LRO_CANNOT);
		}
		}
		/* Find the TCP header (we assured there are no IP options). */
		th = (struct tcphdr )(ip4 + 1);
		return (0);
		}
		#endif

		static void
		tcp_lro_log(struct tcpcb tp, struct lro_ctrl lc,
		struct lro_entry le, struct mbuf m, int frm, int32_t tcp_data_len,
		uint32_t th_seq , uint32_t th_ack, uint16_t th_win)
		{
		if (tp->t_logstate != TCP_LOG_STATE_OFF) {
		union tcp_log_stackspecific log;
		struct timeval tv;
		uint32_t cts;

		cts = tcp_get_usecs(&tv);
		memset(&log, 0, sizeof(union tcp_log_stackspecific));
		log.u_bbr.flex8 = frm;
		log.u_bbr.flex1 = tcp_data_len;
		if (m)
		log.u_bbr.flex2 = m->m_pkthdr.len;
		else
		log.u_bbr.flex2 = 0;
		log.u_bbr.flex3 = le->append_cnt;
		log.u_bbr.flex4 = le->p_len;
		log.u_bbr.flex5 = le->m_head->m_pkthdr.len;
		log.u_bbr.delRate = le->m_head->m_flags;
		log.u_bbr.rttProp = le->m_head->m_pkthdr.rcv_tstmp;
		log.u_bbr.flex6 = lc->lro_length_lim;
		log.u_bbr.flex7 = lc->lro_ackcnt_lim;
		log.u_bbr.inflight = th_seq;
		log.u_bbr.timeStamp = cts;
		log.u_bbr.epoch = le->next_seq;
		log.u_bbr.delivered = th_ack;
		log.u_bbr.lt_epoch = le->ack_seq;
		log.u_bbr.pacing_gain = th_win;
		log.u_bbr.cwnd_gain = le->window;
		log.u_bbr.cur_del_rate = (uint64_t)m;
		log.u_bbr.bw_inuse = (uint64_t)le->m_head;
		log.u_bbr.pkts_out = le->mbuf_cnt; /* Total mbufs added */
		log.u_bbr.applimited = le->ulp_csum;
		log.u_bbr.lost = le->mbuf_appended;
		TCP_LOG_EVENTP(tp, NULL,
		&tp->t_inpcb->inp_socket->so_rcv,
		&tp->t_inpcb->inp_socket->so_snd,
		TCP_LOG_LRO, 0,
		0, &log, false, &tv);
		}
		}

		static void
		tcp_flush_out_le(struct tcpcb tp, struct lro_ctrl lc, struct lro_entry *le, int locked)
		{
		if (le->append_cnt > 1) {
struct tcphdr *th;		struct tcphdr *th;
uint16_t p_len;		uint16_t p_len;

p_len = htons(le->p_len);		p_len = htons(le->p_len);
switch (le->eh_type) {		switch (le->eh_type) {
#ifdef INET6		#ifdef INET6
case ETHERTYPE_IPV6:		case ETHERTYPE_IPV6:
{		{
struct ip6_hdr *ip6;		struct ip6_hdr *ip6;

ip6 = le->le_ip6;		ip6 = le->le_ip6;
ip6->ip6_plen = p_len;		ip6->ip6_plen = p_len;
th = (struct tcphdr *)(ip6 + 1);		th = (struct tcphdr *)(ip6 + 1);
le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID \|		le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID \|
CSUM_PSEUDO_HDR;		CSUM_PSEUDO_HDR;
le->p_len += ETHER_HDR_LEN + sizeof(*ip6);		le->p_len += ETHER_HDR_LEN + sizeof(*ip6);
break;		break;
}		}
#endif		#endif
#ifdef INET		#ifdef INET
case ETHERTYPE_IP:		case ETHERTYPE_IP:
{		{
struct ip *ip4;		struct ip *ip4;
#ifdef TCP_LRO_UPDATE_CSUM
uint32_t cl;		uint32_t cl;
uint16_t c;		uint16_t c;
#endif

ip4 = le->le_ip4;		ip4 = le->le_ip4;
#ifdef TCP_LRO_UPDATE_CSUM
/* Fix IP header checksum for new length. */		/* Fix IP header checksum for new length. */
c = ~ip4->ip_sum;		c = ~ip4->ip_sum;
cl = c;		cl = c;
c = ~ip4->ip_len;		c = ~ip4->ip_len;
cl += c + p_len;		cl += c + p_len;
while (cl > 0xffff)		while (cl > 0xffff)
cl = (cl >> 16) + (cl & 0xffff);		cl = (cl >> 16) + (cl & 0xffff);
c = cl;		c = cl;
ip4->ip_sum = ~c;		ip4->ip_sum = ~c;
#else
ip4->ip_sum = TCP_LRO_INVALID_CSUM;
#endif
ip4->ip_len = p_len;		ip4->ip_len = p_len;
th = (struct tcphdr *)(ip4 + 1);		th = (struct tcphdr *)(ip4 + 1);
le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID \|		le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID \|
CSUM_PSEUDO_HDR \| CSUM_IP_CHECKED \| CSUM_IP_VALID;		CSUM_PSEUDO_HDR \| CSUM_IP_CHECKED \| CSUM_IP_VALID;
le->p_len += ETHER_HDR_LEN;		le->p_len += ETHER_HDR_LEN;
break;		break;
}		}
#endif		#endif
Show All 9 Lines	#endif
/* Incorporate latest timestamp into the TCP header. */		/* Incorporate latest timestamp into the TCP header. */
if (le->timestamp != 0) {		if (le->timestamp != 0) {
uint32_t *ts_ptr;		uint32_t *ts_ptr;

ts_ptr = (uint32_t *)(th + 1);		ts_ptr = (uint32_t *)(th + 1);
ts_ptr[1] = htonl(le->tsval);		ts_ptr[1] = htonl(le->tsval);
ts_ptr[2] = le->tsecr;		ts_ptr[2] = le->tsecr;
}		}
#ifdef TCP_LRO_UPDATE_CSUM
/* Update the TCP header checksum. */		/* Update the TCP header checksum. */
le->ulp_csum += p_len;		le->ulp_csum += p_len;
le->ulp_csum += tcp_lro_csum_th(th);		le->ulp_csum += tcp_lro_csum_th(th);
while (le->ulp_csum > 0xffff)		while (le->ulp_csum > 0xffff)
le->ulp_csum = (le->ulp_csum >> 16) +		le->ulp_csum = (le->ulp_csum >> 16) +
(le->ulp_csum & 0xffff);		(le->ulp_csum & 0xffff);
th->th_sum = (le->ulp_csum & 0xffff);		th->th_sum = (le->ulp_csum & 0xffff);
th->th_sum = ~th->th_sum;		th->th_sum = ~th->th_sum;
#else		if (tp && locked) {
th->th_sum = TCP_LRO_INVALID_CSUM;		tcp_lro_log(tp, lc, le, NULL, 7, 0, 0, 0, 0);
		}
		}
		/*
		* Break any chain, this is not set to NULL on the singleton
		* case m_nextpkt points to m_head. Other case set them
		* m_nextpkt to NULL in push_and_replace.
		*/
		le->m_head->m_nextpkt = NULL;
		le->m_head->m_pkthdr.lro_nsegs = le->append_cnt;
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, le->m_head, 8, 0, 0, 0, 0);
		}
		(*lc->ifp->if_input)(lc->ifp, le->m_head);
		lc->lro_queued += le->append_cnt;
		}

		static void
		tcp_set_le_to_m(struct lro_ctrl lc, struct lro_entry le, struct mbuf *m)
		{
		struct ether_header *eh;
		void l3hdr = NULL; / Keep compiler happy. */
		struct tcphdr *th;
		#ifdef INET6
		struct ip6_hdr ip6 = NULL; / Keep compiler happy. */
#endif		#endif
		#ifdef INET
		struct ip ip4 = NULL; / Keep compiler happy. */
		#endif
		uint32_t *ts_ptr;
		int error, l, ts_failed = 0;
		uint16_t tcp_data_len;
		uint16_t csum;

		error = -1;
		eh = mtod(m, struct ether_header *);
		/*
		* We must reset the other pointers since the mbuf
		* we were pointing too is about to go away.
		*/
		switch (le->eh_type) {
		#ifdef INET6
		case ETHERTYPE_IPV6:
		l3hdr = ip6 = (struct ip6_hdr *)(eh + 1);
		error = tcp_lro_rx_ipv6(lc, m, ip6, &th);
		le->le_ip6 = ip6;
		le->source_ip6 = ip6->ip6_src;
		le->dest_ip6 = ip6->ip6_dst;
		le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6);
		break;
		#endif
		#ifdef INET
		case ETHERTYPE_IP:
		l3hdr = ip4 = (struct ip *)(eh + 1);
		error = tcp_lro_rx_ipv4(lc, m, ip4, &th);
		le->le_ip4 = ip4;
		le->source_ip4 = ip4->ip_src.s_addr;
		le->dest_ip4 = ip4->ip_dst.s_addr;
		le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN;
		break;
		#endif
}		}
		KASSERT(error == 0, ("%s: le=%p tcp_lro_rx_xxx failed\n",
		__func__, le));
		ts_ptr = (uint32_t *)(th + 1);
		l = (th->th_off << 2);
		l -= sizeof(*th);
		if (l != 0 &&
		(__predict_false(l != TCPOLEN_TSTAMP_APPA) \|\|
		(*ts_ptr != ntohl(TCPOPT_NOP<<24\|TCPOPT_NOP<<16\|
		TCPOPT_TIMESTAMP<<8\|TCPOLEN_TIMESTAMP)))) {
		/* We have failed to find a timestamp some other option? */
		ts_failed = 1;
		}
		if ((l != 0) && (ts_failed == 0)) {
		le->timestamp = 1;
		le->tsval = ntohl(*(ts_ptr + 1));
		le->tsecr = *(ts_ptr + 2);
		} else
		le->timestamp = 0;
		le->source_port = th->th_sport;
		le->dest_port = th->th_dport;
		/* Pull out the csum */
		tcp_data_len = m->m_pkthdr.lro_len;
		le->next_seq = ntohl(th->th_seq) + tcp_data_len;
		le->ack_seq = th->th_ack;
		le->window = th->th_win;
		csum = th->th_sum;
		/* Setup the data pointers */
		le->m_head = m;
		le->m_tail = m_last(m);
		le->append_cnt = 0;
		le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len,
		~csum);
		le->append_cnt++;
		th->th_sum = csum; /* Restore checksum on first packet. */
		}

le->m_head->m_pkthdr.lro_nsegs = le->append_cnt + 1;		static void
(*lc->ifp->if_input)(lc->ifp, le->m_head);		tcp_push_and_replace(struct tcpcb tp, struct lro_ctrl lc, struct lro_entry le, struct mbuf m, int locked)
lc->lro_queued += le->append_cnt + 1;		{
		/*
		* Push up the stack the current le and replace
		* it with m.
		*/
		struct mbuf *msave;

		/* Grab off the next and save it */
		msave = le->m_head->m_nextpkt;
		le->m_head->m_nextpkt = NULL;
		/* Now push out the old le entry */
		tcp_flush_out_le(tp, lc, le, locked);
		/*
		* Now to replace the data properly in the le
		* we have to reset the tcp header and
		* other fields.
		*/
		tcp_set_le_to_m(lc, le, m);
		/* Restore the next list */
		m->m_nextpkt = msave;
		}

		static void
		tcp_lro_condense(struct tcpcb tp, struct lro_ctrl lc, struct lro_entry *le, int locked)
		{
		/*
		* Walk through the mbuf chain we
		* have on tap and compress/condense
		* as required.
		*/
		uint32_t *ts_ptr;
		struct mbuf *m;
		struct tcphdr *th;
		uint16_t tcp_data_len, csum_upd;
		int l;

		/*
		* First we must check the lead (m_head)
		* we must make sure that it is not
		* something that should be sent up
		* right away (sack etc).
		*/
		again:

		m = le->m_head->m_nextpkt;
		if (m == NULL) {
		/* Just the one left */
		return;
		}
		th = tcp_lro_get_th(le, le->m_head);
		KASSERT(th != NULL,
		("le:%p m:%p th comes back NULL?", le, le->m_head));
		l = (th->th_off << 2);
		l -= sizeof(*th);
		ts_ptr = (uint32_t *)(th + 1);
		if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) \|\|
		(*ts_ptr != ntohl(TCPOPT_NOP<<24\|TCPOPT_NOP<<16\|
		TCPOPT_TIMESTAMP<<8\|TCPOLEN_TIMESTAMP)))) {
		/*
		* Its not the timestamp. We can't
		* use this guy as the head.
		*/
		le->m_head->m_nextpkt = m->m_nextpkt;
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		if ((th->th_flags & ~(TH_ACK \| TH_PUSH)) != 0) {
		/*
		* Make sure that previously seen segements/ACKs are delivered
		* before this segment, e.g. FIN.
		*/
		le->m_head->m_nextpkt = m->m_nextpkt;
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		while((m = le->m_head->m_nextpkt) != NULL) {
		/*
		* condense m into le, first
		* pull m out of the list.
		*/
		le->m_head->m_nextpkt = m->m_nextpkt;
		m->m_nextpkt = NULL;
		/* Setup my data */
		tcp_data_len = m->m_pkthdr.lro_len;
		th = tcp_lro_get_th(le, m);
		KASSERT(th != NULL,
		("le:%p m:%p th comes back NULL?", le, m));
		ts_ptr = (uint32_t *)(th + 1);
		l = (th->th_off << 2);
		l -= sizeof(*th);
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, m, 1, 0, 0, 0, 0);
		}
		if (le->append_cnt >= lc->lro_ackcnt_lim) {
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, m, 2, 0, 0, 0, 0);
		}
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		if (le->p_len > (lc->lro_length_lim - tcp_data_len)) {
		/* Flush now if appending will result in overflow. */
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, m, 3, tcp_data_len, 0, 0, 0);
		}
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) \|\|
		(*ts_ptr != ntohl(TCPOPT_NOP<<24\|TCPOPT_NOP<<16\|
		TCPOPT_TIMESTAMP<<8\|TCPOLEN_TIMESTAMP)))) {
		/*
		* Maybe a sack in the new one? We need to
		* start all over after flushing the
		* current le. We will go up to the beginning
		* and flush it (calling the replace again possibly
		* or just returning).
		*/
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		if ((th->th_flags & ~(TH_ACK \| TH_PUSH)) != 0) {
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		if (l != 0) {
		uint32_t tsval = ntohl(*(ts_ptr + 1));
		/* Make sure timestamp values are increasing. */
		if (TSTMP_GT(le->tsval, tsval)) {
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		le->tsval = tsval;
		le->tsecr = *(ts_ptr + 2);
		}
		/* Try to append the new segment. */
		if (__predict_false(ntohl(th->th_seq) != le->next_seq \|\|
		(tcp_data_len == 0 &&
		le->ack_seq == th->th_ack &&
		le->window == th->th_win))) {
		/* Out of order packet or duplicate ACK. */
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, m, 4, tcp_data_len,
		ntohl(th->th_seq),
		th->th_ack,
		th->th_win);
		}
		tcp_push_and_replace(tp, lc, le, m, locked);
		goto again;
		}
		if (tcp_data_len \|\| SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq))) {
		le->next_seq += tcp_data_len;
		le->ack_seq = th->th_ack;
		le->window = th->th_win;
		} else if (th->th_ack == le->ack_seq) {
		le->window = WIN_MAX(le->window, th->th_win);
		}
		csum_upd = m->m_pkthdr.lro_csum;
		le->ulp_csum += csum_upd;
		if (tcp_data_len == 0) {
		le->append_cnt++;
		le->mbuf_cnt--;
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, m, 5, tcp_data_len,
		ntohl(th->th_seq),
		th->th_ack,
		th->th_win);
		}
		m_freem(m);
		continue;
		}
		le->append_cnt++;
		le->mbuf_appended++;
		le->p_len += tcp_data_len;
		/*
		* Adjust the mbuf so that m_data points to the first byte of
		* the ULP payload. Adjust the mbuf to avoid complications and
		* append new segment to existing mbuf chain.
		*/
		m_adj(m, m->m_pkthdr.len - tcp_data_len);
		if (tp && locked) {
		tcp_lro_log(tp, lc, le, m, 6, tcp_data_len,
		ntohl(th->th_seq),
		th->th_ack,
		th->th_win);
		}
		m_demote_pkthdr(m);
		le->m_tail->m_next = m;
		le->m_tail = m_last(m);
		}
		}

		static void
		tcp_queue_pkts(struct tcpcb tp, struct lro_entry le)
		{
		if (tp->t_in_pkt == NULL) {
		/* Nothing yet there */
		tp->t_in_pkt = le->m_head;
		tp->t_tail_pkt = le->m_last_mbuf;
		} else {
		/* Already some there */
		tp->t_tail_pkt->m_nextpkt = le->m_head;
		tp->t_tail_pkt = le->m_last_mbuf;
		}
		le->m_head = NULL;
		le->m_last_mbuf = NULL;
		}

		void
		tcp_lro_flush(struct lro_ctrl lc, struct lro_entry le)
		{
		struct tcpcb *tp = NULL;
		int locked = 0;
		#ifdef TCPHPTS
		struct inpcb *inp = NULL;
		int need_wakeup = 0, can_queue = 0;
		struct epoch_tracker et;

		/* Now lets lookup the inp first */
		CURVNET_SET(lc->ifp->if_vnet);
		if (tcplro_stacks_wanting_mbufq == 0)
		goto skip_lookup;
		INP_INFO_RLOCK_ET(&V_tcbinfo, et);
		switch (le->eh_type) {
		#ifdef INET6
		case ETHERTYPE_IPV6:
		inp = in6_pcblookup(&V_tcbinfo, &le->source_ip6,
		le->source_port, &le->dest_ip6,le->dest_port,
		INPLOOKUP_WLOCKPCB,
		lc->ifp);
		break;
		#endif
		#ifdef INET
		case ETHERTYPE_IP:
		inp = in_pcblookup(&V_tcbinfo, le->le_ip4->ip_src,
		le->source_port, le->le_ip4->ip_dst, le->dest_port,
		INPLOOKUP_WLOCKPCB,
		lc->ifp);
		break;
		#endif
		}
		INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
		if (inp && ((inp->inp_flags & (INP_DROPPED\|INP_TIMEWAIT)) \|\|
		(inp->inp_flags2 & INP_FREED))) {
		/* We don't want this guy */
		INP_WUNLOCK(inp);
		inp = NULL;
		}
		if (inp && (inp->inp_flags2 & INP_SUPPORTS_MBUFQ)) {
		/* The transport supports mbuf queuing */
		can_queue = 1;
		if (le->need_wakeup \|\|
		((inp->inp_in_input == 0) &&
		((inp->inp_flags2 & INP_MBUF_QUEUE_READY) == 0))) {
		/*
		* Either the transport is off on a keep-alive
		* (it has the queue_ready flag clear and its
		* not already been woken) or the entry has
		* some urgent thing (FIN or possibly SACK blocks).
		* This means we need to wake the transport up by
		* putting it on the input pacer.
		*/
		need_wakeup = 1;
		if ((inp->inp_flags2 & INP_DONT_SACK_QUEUE) &&
		(le->need_wakeup != 1)) {
		/*
		* Prohibited from a sack wakeup.
		*/
		need_wakeup = 0;
		}
		}
		/* Do we need to be awoken due to lots of data or acks? */
		if ((le->tcp_tot_p_len >= lc->lro_length_lim) \|\|
		(le->mbuf_cnt >= lc->lro_ackcnt_lim))
		need_wakeup = 1;
		}
		if (inp) {
		tp = intotcpcb(inp);
		locked = 1;
		} else
		tp = NULL;
		if (can_queue) {
		counter_u64_add(tcp_inp_lro_direct_queue, 1);
		tcp_lro_log(tp, lc, le, NULL, 22, need_wakeup,
		inp->inp_flags2, inp->inp_in_input, le->need_wakeup);
		tcp_queue_pkts(tp, le);
		if (need_wakeup) {
		/*
		* We must get the guy to wakeup via
		* hpts.
		*/
		counter_u64_add(tcp_inp_lro_wokeup_queue, 1);
		if (le->need_wakeup)
		counter_u64_add(tcp_inp_lro_sack_wake, 1);
		tcp_queue_to_input(inp);
		}
		}
		if (inp && (hold_lock_over_compress == 0)) {
		/* Unlock it */
		locked = 0;
		tp = NULL;
		counter_u64_add(tcp_inp_lro_locks_taken, 1);
		INP_WUNLOCK(inp);
		}
		if (can_queue == 0) {
		skip_lookup:
		#endif
		/* Old fashioned lro method */
		if (le->m_head != le->m_last_mbuf) {
		counter_u64_add(tcp_inp_lro_compressed, 1);
		tcp_lro_condense(tp, lc, le, locked);
		} else
		counter_u64_add(tcp_inp_lro_single_push, 1);
		tcp_flush_out_le(tp, lc, le, locked);
		#ifdef TCPHPTS
		}
		if (inp && locked) {
		counter_u64_add(tcp_inp_lro_locks_taken, 1);
		INP_WUNLOCK(inp);
		}
		CURVNET_RESTORE();
		#endif
lc->lro_flushed++;		lc->lro_flushed++;
bzero(le, sizeof(*le));		bzero(le, sizeof(*le));
LIST_INSERT_HEAD(&lc->lro_free, le, next);		LIST_INSERT_HEAD(&lc->lro_free, le, next);
}		}

#ifdef HAVE_INLINE_FLSLL		#ifdef HAVE_INLINE_FLSLL
#define tcp_lro_msb_64(x) (1ULL << (flsll(x) - 1))		#define tcp_lro_msb_64(x) (1ULL << (flsll(x) - 1))
#else		#else
▲ Show 20 Lines • Show All 125 Lines • ▼ Show 20 Lines	tcp_lro_flush_all(struct lro_ctrl *lc)
}		}
done:		done:
/* flush active streams */		/* flush active streams */
tcp_lro_rx_done(lc);		tcp_lro_rx_done(lc);

lc->lro_mbuf_count = 0;		lc->lro_mbuf_count = 0;
}		}

#ifdef INET6		static void
static int		lro_set_mtime(struct timeval tv, struct timespec ts)
tcp_lro_rx_ipv6(struct lro_ctrl lc, struct mbuf m, struct ip6_hdr *ip6,
struct tcphdr **th)
{		{
		tv->tv_sec = ts->tv_sec;
/* XXX-BZ we should check the flow-label. */		tv->tv_usec = ts->tv_nsec / 1000;

/* XXX-BZ We do not yet support ext. hdrs. */
if (ip6->ip6_nxt != IPPROTO_TCP)
return (TCP_LRO_NOT_SUPPORTED);

/* Find the TCP header. */
th = (struct tcphdr )(ip6 + 1);

return (0);
}		}
#endif

#ifdef INET
static int		static int
tcp_lro_rx_ipv4(struct lro_ctrl lc, struct mbuf m, struct ip *ip4,
struct tcphdr **th)
{
int csum_flags;
uint16_t csum;

if (ip4->ip_p != IPPROTO_TCP)
return (TCP_LRO_NOT_SUPPORTED);

/* Ensure there are no options. */
if ((ip4->ip_hl << 2) != sizeof (*ip4))
return (TCP_LRO_CANNOT);

/* .. and the packet is not fragmented. */
if (ip4->ip_off & htons(IP_MF\|IP_OFFMASK))
return (TCP_LRO_CANNOT);

/* Legacy IP has a header checksum that needs to be correct. */
csum_flags = m->m_pkthdr.csum_flags;
if (csum_flags & CSUM_IP_CHECKED) {
if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) {
lc->lro_bad_csum++;
return (TCP_LRO_CANNOT);
}
} else {
csum = in_cksum_hdr(ip4);
if (__predict_false((csum) != 0)) {
lc->lro_bad_csum++;
return (TCP_LRO_CANNOT);
}
}

/* Find the TCP header (we assured there are no IP options). */
th = (struct tcphdr )(ip4 + 1);

return (0);
}
#endif

static int
tcp_lro_rx2(struct lro_ctrl lc, struct mbuf m, uint32_t csum, int use_hash)		tcp_lro_rx2(struct lro_ctrl lc, struct mbuf m, uint32_t csum, int use_hash)
{		{
struct lro_entry *le;		struct lro_entry *le;
struct ether_header *eh;		struct ether_header *eh;
#ifdef INET6		#ifdef INET6
struct ip6_hdr ip6 = NULL; / Keep compiler happy. */		struct ip6_hdr ip6 = NULL; / Keep compiler happy. */
#endif		#endif
#ifdef INET		#ifdef INET
struct ip ip4 = NULL; / Keep compiler happy. */		struct ip ip4 = NULL; / Keep compiler happy. */
#endif		#endif
struct tcphdr *th;		struct tcphdr *th;
void l3hdr = NULL; / Keep compiler happy. */		void l3hdr = NULL; / Keep compiler happy. */
uint32_t *ts_ptr;		uint32_t *ts_ptr;
tcp_seq seq;		tcp_seq seq;
int error, ip_len, l;		int error, ip_len, l;
uint16_t eh_type, tcp_data_len;		uint16_t eh_type, tcp_data_len, need_flush;
struct lro_head *bucket;		struct lro_head *bucket;
int force_flush = 0;		struct timespec arrv;

/* We expect a contiguous header [eh, ip, tcp]. */		/* We expect a contiguous header [eh, ip, tcp]. */
		if ((m->m_flags & (M_TSTMP_LRO\|M_TSTMP)) == 0) {
		/* If no hardware or arrival stamp on the packet add arrival */
		nanouptime(&arrv);
		m->m_pkthdr.rcv_tstmp = (arrv.tv_sec * 1000000000) + arrv.tv_nsec;
		m->m_flags \|= M_TSTMP_LRO;
		}
eh = mtod(m, struct ether_header *);		eh = mtod(m, struct ether_header *);
eh_type = ntohs(eh->ether_type);		eh_type = ntohs(eh->ether_type);
switch (eh_type) {		switch (eh_type) {
#ifdef INET6		#ifdef INET6
case ETHERTYPE_IPV6:		case ETHERTYPE_IPV6:
{		{
CURVNET_SET(lc->ifp->if_vnet);		CURVNET_SET(lc->ifp->if_vnet);
if (V_ip6_forwarding != 0) {		if (V_ip6_forwarding != 0) {
▲ Show 20 Lines • Show All 42 Lines • ▼ Show 20 Lines	#endif
l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len);		l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len);
if (l != 0) {		if (l != 0) {
if (l < 0)		if (l < 0)
/* Truncated packet. */		/* Truncated packet. */
return (TCP_LRO_CANNOT);		return (TCP_LRO_CANNOT);

m_adj(m, -l);		m_adj(m, -l);
}		}

/*		/*
* Check TCP header constraints.		* Check TCP header constraints.
*/		*/
/* Ensure no bits set besides ACK or PSH. */
if ((th->th_flags & ~(TH_ACK \| TH_PUSH)) != 0) {
if (th->th_flags & TH_SYN)		if (th->th_flags & TH_SYN)
return (TCP_LRO_CANNOT);		return (TCP_LRO_CANNOT);
/*		if ((th->th_flags & ~(TH_ACK \| TH_PUSH)) != 0)
* Make sure that previously seen segements/ACKs are delivered		need_flush = 1;
* before this segement, e.g. FIN.		else
*/		need_flush = 0;
force_flush = 1;
}

/* XXX-BZ We lose a ACK\|PUSH flag concatenating multiple segments. */
/* XXX-BZ Ideally we'd flush on PUSH? */

/*
* Check for timestamps.
* Since the only option we handle are timestamps, we only have to
* handle the simple case of aligned timestamps.
*/
l = (th->th_off << 2);		l = (th->th_off << 2);
		ts_ptr = (uint32_t *)(th + 1);
tcp_data_len -= l;		tcp_data_len -= l;
l -= sizeof(*th);		l -= sizeof(*th);
ts_ptr = (uint32_t *)(th + 1);
if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) \|\|		if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) \|\|
(*ts_ptr != ntohl(TCPOPT_NOP<<24\|TCPOPT_NOP<<16\|		(*ts_ptr != ntohl(TCPOPT_NOP<<24\|TCPOPT_NOP<<16\|
TCPOPT_TIMESTAMP<<8\|TCPOLEN_TIMESTAMP)))) {		TCPOPT_TIMESTAMP<<8\|TCPOLEN_TIMESTAMP)))) {
/*		/*
* Make sure that previously seen segements/ACKs are delivered		* We have an option besides Timestamps, maybe
* before this segement.		* it is a sack (most likely) which means we
		* will probably need to wake up a sleeper (if
		* the guy does queueing).
*/		*/
force_flush = 1;		need_flush = 2;
}		}

/* If the driver did not pass in the checksum, set it now. */		/* If the driver did not pass in the checksum, set it now. */
if (csum == 0x0000)		if (csum == 0x0000)
csum = th->th_sum;		csum = th->th_sum;

seq = ntohl(th->th_seq);		seq = ntohl(th->th_seq);

if (!use_hash) {		if (!use_hash) {
bucket = &lc->lro_hash[0];		bucket = &lc->lro_hash[0];
} else if (M_HASHTYPE_ISHASH(m)) {		} else if (M_HASHTYPE_ISHASH(m)) {
bucket = &lc->lro_hash[m->m_pkthdr.flowid % lc->lro_hashsz];		bucket = &lc->lro_hash[m->m_pkthdr.flowid % lc->lro_hashsz];
} else {		} else {
uint32_t hash;		uint32_t hash;

switch (eh_type) {		switch (eh_type) {
#ifdef INET		#ifdef INET
case ETHERTYPE_IP:		case ETHERTYPE_IP:
hash = ip4->ip_src.s_addr + ip4->ip_dst.s_addr;		hash = ip4->ip_src.s_addr + ip4->ip_dst.s_addr;
break;		break;
#endif		#endif
#ifdef INET6		#ifdef INET6
case ETHERTYPE_IPV6:		case ETHERTYPE_IPV6:
hash = ip6->ip6_src.s6_addr32[0] +		hash = ip6->ip6_src.s6_addr32[0] +
ip6->ip6_dst.s6_addr32[0];		ip6->ip6_dst.s6_addr32[0];
hash += ip6->ip6_src.s6_addr32[1] +		hash += ip6->ip6_src.s6_addr32[1] +
ip6->ip6_dst.s6_addr32[1];		ip6->ip6_dst.s6_addr32[1];
hash += ip6->ip6_src.s6_addr32[2] +		hash += ip6->ip6_src.s6_addr32[2] +
ip6->ip6_dst.s6_addr32[2];		ip6->ip6_dst.s6_addr32[2];
hash += ip6->ip6_src.s6_addr32[3] +		hash += ip6->ip6_src.s6_addr32[3] +
ip6->ip6_dst.s6_addr32[3];		ip6->ip6_dst.s6_addr32[3];
break;		break;
#endif		#endif
default:		default:
hash = 0;		hash = 0;
break;		break;
}		}
hash += th->th_sport + th->th_dport;		hash += th->th_sport + th->th_dport;
bucket = &lc->lro_hash[hash % lc->lro_hashsz];		bucket = &lc->lro_hash[hash % lc->lro_hashsz];
}		}

/* Try to find a matching previous segment. */		/* Try to find a matching previous segment. */
LIST_FOREACH(le, bucket, hash_next) {		LIST_FOREACH(le, bucket, hash_next) {
if (le->eh_type != eh_type)		if (le->eh_type != eh_type)
continue;		continue;
if (le->source_port != th->th_sport \|\|		if (le->source_port != th->th_sport \|\|
le->dest_port != th->th_dport)		le->dest_port != th->th_dport)
continue;		continue;
switch (eh_type) {		switch (eh_type) {
#ifdef INET6		#ifdef INET6
case ETHERTYPE_IPV6:		case ETHERTYPE_IPV6:
if (bcmp(&le->source_ip6, &ip6->ip6_src,		if (bcmp(&le->source_ip6, &ip6->ip6_src,
sizeof(struct in6_addr)) != 0 \|\|		sizeof(struct in6_addr)) != 0 \|\|
bcmp(&le->dest_ip6, &ip6->ip6_dst,		bcmp(&le->dest_ip6, &ip6->ip6_dst,
sizeof(struct in6_addr)) != 0)		sizeof(struct in6_addr)) != 0)
continue;		continue;
break;		break;
#endif		#endif
#ifdef INET		#ifdef INET
case ETHERTYPE_IP:		case ETHERTYPE_IP:
if (le->source_ip4 != ip4->ip_src.s_addr \|\|		if (le->source_ip4 != ip4->ip_src.s_addr \|\|
le->dest_ip4 != ip4->ip_dst.s_addr)		le->dest_ip4 != ip4->ip_dst.s_addr)
continue;		continue;
break;		break;
#endif		#endif
}		}
		if (tcp_data_len \|\| SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq)) \|\|
if (force_flush) {		(th->th_ack == le->ack_seq)) {
/* Timestamps mismatch; this is a FIN, etc */		m->m_pkthdr.lro_len = tcp_data_len;
tcp_lro_active_remove(le);
tcp_lro_flush(lc, le);
return (TCP_LRO_CANNOT);
}

/* Flush now if appending will result in overflow. */
if (le->p_len > (lc->lro_length_lim - tcp_data_len)) {
tcp_lro_active_remove(le);
tcp_lro_flush(lc, le);
break;
}

/* Try to append the new segment. */
if (__predict_false(seq != le->next_seq \|\|
(tcp_data_len == 0 &&
le->ack_seq == th->th_ack &&
le->window == th->th_win))) {
/* Out of order packet or duplicate ACK. */
tcp_lro_active_remove(le);
tcp_lro_flush(lc, le);
return (TCP_LRO_CANNOT);
}

if (l != 0) {
uint32_t tsval = ntohl(*(ts_ptr + 1));
/* Make sure timestamp values are increasing. */
/* XXX-BZ flip and use TSTMP_GEQ macro for this? */
if (__predict_false(le->tsval > tsval \|\|
*(ts_ptr + 2) == 0))
return (TCP_LRO_CANNOT);
le->tsval = tsval;
le->tsecr = *(ts_ptr + 2);
}
if (tcp_data_len \|\| SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq))) {
le->next_seq += tcp_data_len;
le->ack_seq = th->th_ack;
le->window = th->th_win;
le->append_cnt++;
} else if (th->th_ack == le->ack_seq) {
le->window = WIN_MAX(le->window, th->th_win);
le->append_cnt++;
} else {		} else {
/* no data and old ack */		/* no data and old ack */
le->append_cnt++;
m_freem(m);		m_freem(m);
return (0);		return (0);
}		}
#ifdef TCP_LRO_UPDATE_CSUM		if (need_flush)
le->ulp_csum += tcp_lro_rx_csum_fixup(le, l3hdr, th,		le->need_wakeup = need_flush;
		/* Save of the data only csum */
		m->m_pkthdr.rcvif = lc->ifp;
		m->m_pkthdr.lro_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th,
tcp_data_len, ~csum);		tcp_data_len, ~csum);
#endif		th->th_sum = csum; /* Restore checksum */
		/* Save off the tail I am appending too (prev) */
if (tcp_data_len == 0) {		le->m_prev_last = le->m_last_mbuf;
m_freem(m);		/* Mark me in the last spot */
/*		le->m_last_mbuf->m_nextpkt = m;
* Flush this LRO entry, if this ACK should not		/* Now set the tail to me */
* be further delayed.		le->m_last_mbuf = m;
*/		le->mbuf_cnt++;
if (le->append_cnt >= lc->lro_ackcnt_lim) {		m->m_nextpkt = NULL;
tcp_lro_active_remove(le);		/* Add to the total size of data */
tcp_lro_flush(lc, le);		le->tcp_tot_p_len += tcp_data_len;
}		lro_set_mtime(&le->mtime, &arrv);
return (0);		return (0);
}		}

le->p_len += tcp_data_len;

/*
* Adjust the mbuf so that m_data points to the first byte of
* the ULP payload. Adjust the mbuf to avoid complications and
* append new segment to existing mbuf chain.
*/
m_adj(m, m->m_pkthdr.len - tcp_data_len);
m_demote_pkthdr(m);

le->m_tail->m_next = m;
le->m_tail = m_last(m);

/*
* If a possible next full length packet would cause an
* overflow, pro-actively flush now.
*/
if (le->p_len > (lc->lro_length_lim - lc->ifp->if_mtu)) {
tcp_lro_active_remove(le);
tcp_lro_flush(lc, le);
} else
getmicrotime(&le->mtime);

return (0);
}

if (force_flush) {
/*
* Nothing to flush, but this segment can not be further
* aggregated/delayed.
*/
return (TCP_LRO_CANNOT);
}

/* Try to find an empty slot. */		/* Try to find an empty slot. */
if (LIST_EMPTY(&lc->lro_free))		if (LIST_EMPTY(&lc->lro_free))
return (TCP_LRO_NO_ENTRIES);		return (TCP_LRO_NO_ENTRIES);

/* Start a new segment chain. */		/* Start a new segment chain. */
le = LIST_FIRST(&lc->lro_free);		le = LIST_FIRST(&lc->lro_free);
LIST_REMOVE(le, next);		LIST_REMOVE(le, next);
tcp_lro_active_insert(lc, bucket, le);		tcp_lro_active_insert(lc, bucket, le);
getmicrotime(&le->mtime);		lro_set_mtime(&le->mtime, &arrv);

/* Start filling in details. */		/* Start filling in details. */
switch (eh_type) {		switch (eh_type) {
#ifdef INET6		#ifdef INET6
case ETHERTYPE_IPV6:		case ETHERTYPE_IPV6:
le->le_ip6 = ip6;		le->le_ip6 = ip6;
le->source_ip6 = ip6->ip6_src;		le->source_ip6 = ip6->ip6_src;
le->dest_ip6 = ip6->ip6_dst;		le->dest_ip6 = ip6->ip6_dst;
le->eh_type = eh_type;		le->eh_type = eh_type;
le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6);		le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6);
break;		break;
#endif		#endif
#ifdef INET		#ifdef INET
case ETHERTYPE_IP:		case ETHERTYPE_IP:
le->le_ip4 = ip4;		le->le_ip4 = ip4;
le->source_ip4 = ip4->ip_src.s_addr;		le->source_ip4 = ip4->ip_src.s_addr;
le->dest_ip4 = ip4->ip_dst.s_addr;		le->dest_ip4 = ip4->ip_dst.s_addr;
le->eh_type = eh_type;		le->eh_type = eh_type;
le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN;		le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN;
break;		break;
#endif		#endif
}		}
le->source_port = th->th_sport;		le->source_port = th->th_sport;
le->dest_port = th->th_dport;		le->dest_port = th->th_dport;

le->next_seq = seq + tcp_data_len;		le->next_seq = seq + tcp_data_len;
le->ack_seq = th->th_ack;		le->ack_seq = th->th_ack;
le->window = th->th_win;		le->window = th->th_win;
if (l != 0) {		if (l != 0) {
le->timestamp = 1;		le->timestamp = 1;
le->tsval = ntohl(*(ts_ptr + 1));		le->tsval = ntohl(*(ts_ptr + 1));
le->tsecr = *(ts_ptr + 2);		le->tsecr = *(ts_ptr + 2);
}		}

#ifdef TCP_LRO_UPDATE_CSUM
/*
* Do not touch the csum of the first packet. However save the
* "adjusted" checksum of just the source and destination addresses,
* the next header and the TCP payload. The length and TCP header
* parts may change, so we remove those from the saved checksum and
* re-add with final values on tcp_lro_flush() if needed.
*/
KASSERT(le->ulp_csum == 0, ("%s: le=%p le->ulp_csum=0x%04x\n",		KASSERT(le->ulp_csum == 0, ("%s: le=%p le->ulp_csum=0x%04x\n",
__func__, le, le->ulp_csum));		__func__, le, le->ulp_csum));

		le->append_cnt = 0;
le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len,		le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len,
~csum);		~csum);
th->th_sum = csum; /* Restore checksum on first packet. */		le->append_cnt++;
#endif		th->th_sum = csum; /* Restore checksum */

le->m_head = m;		le->m_head = m;
		m->m_pkthdr.rcvif = lc->ifp;
		le->mbuf_cnt = 1;
		if (need_flush)
		le->need_wakeup = need_flush;
		else
		le->need_wakeup = 0;
le->m_tail = m_last(m);		le->m_tail = m_last(m);
		le->m_last_mbuf = m;
		m->m_nextpkt = NULL;
		le->m_prev_last = NULL;
		/*
		* We keep the total size here for cross checking when we may need
		* to flush/wakeup in the MBUF_QUEUE case.
		*/
		le->tcp_tot_p_len = tcp_data_len;
		m->m_pkthdr.lro_len = tcp_data_len;
return (0);		return (0);
}		}

int		int
tcp_lro_rx(struct lro_ctrl lc, struct mbuf m, uint32_t csum)		tcp_lro_rx(struct lro_ctrl lc, struct mbuf m, uint32_t csum)
{		{

return tcp_lro_rx2(lc, m, csum, 1);		return tcp_lro_rx2(lc, m, csum, 1);
}		}

void		void
tcp_lro_queue_mbuf(struct lro_ctrl lc, struct mbuf mb)		tcp_lro_queue_mbuf(struct lro_ctrl lc, struct mbuf mb)
{		{
		struct timespec arrv;

/* sanity checks */		/* sanity checks */
if (__predict_false(lc->ifp == NULL \|\| lc->lro_mbuf_data == NULL \|\|		if (__predict_false(lc->ifp == NULL \|\| lc->lro_mbuf_data == NULL \|\|
lc->lro_mbuf_max == 0)) {		lc->lro_mbuf_max == 0)) {
/* packet drop */		/* packet drop */
m_freem(mb);		m_freem(mb);
return;		return;
}		}

/* check if packet is not LRO capable */		/* check if packet is not LRO capable */
if (__predict_false(mb->m_pkthdr.csum_flags == 0 \|\|		if (__predict_false(mb->m_pkthdr.csum_flags == 0 \|\|
(lc->ifp->if_capenable & IFCAP_LRO) == 0)) {		(lc->ifp->if_capenable & IFCAP_LRO) == 0)) {

/* input packet to network layer */		/* input packet to network layer */
(*lc->ifp->if_input) (lc->ifp, mb);		(*lc->ifp->if_input) (lc->ifp, mb);
return;		return;
}		}
		/* Arrival Stamp the packet */

		if ((mb->m_flags & M_TSTMP) == 0) {
		/* If no hardware or arrival stamp on the packet add arrival */
		nanouptime(&arrv);
		mb->m_pkthdr.rcv_tstmp = ((arrv.tv_sec * 1000000000) +
		arrv.tv_nsec);
		mb->m_flags \|= M_TSTMP_LRO;
		}
/* create sequence number */		/* create sequence number */
lc->lro_mbuf_data[lc->lro_mbuf_count].seq =		lc->lro_mbuf_data[lc->lro_mbuf_count].seq =
(((uint64_t)M_HASHTYPE_GET(mb)) << 56) \|		(((uint64_t)M_HASHTYPE_GET(mb)) << 56) \|
(((uint64_t)mb->m_pkthdr.flowid) << 24) \|		(((uint64_t)mb->m_pkthdr.flowid) << 24) \|
((uint64_t)lc->lro_mbuf_count);		((uint64_t)lc->lro_mbuf_count);

/* enter mbuf */		/* enter mbuf */
lc->lro_mbuf_data[lc->lro_mbuf_count].mb = mb;		lc->lro_mbuf_data[lc->lro_mbuf_count].mb = mb;

/* flush if array is full */		/* flush if array is full */
if (__predict_false(++lc->lro_mbuf_count == lc->lro_mbuf_max))		if (__predict_false(++lc->lro_mbuf_count == lc->lro_mbuf_max))
tcp_lro_flush_all(lc);		tcp_lro_flush_all(lc);
}		}

/* end */		/* end */