2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
67 * $FreeBSD: src/sys/netinet/tcp_timer.c,v 1.34.2.14 2003/02/03 02:33:41 hsu Exp $
68 * $DragonFly: src/sys/netinet/tcp_timer.c,v 1.17 2008/03/30 20:39:01 dillon Exp $
71 #include "opt_compat.h"
72 #include "opt_inet6.h"
73 #include "opt_tcpdebug.h"
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/kernel.h>
79 #include <sys/sysctl.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/protosw.h>
83 #include <sys/thread.h>
84 #include <sys/globaldata.h>
85 #include <sys/thread2.h>
86 #include <sys/msgport2.h>
88 #include <machine/cpu.h> /* before tcp_seq.h, for tcp_random18() */
90 #include <net/route.h>
91 #include <net/netmsg2.h>
93 #include <netinet/in.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/in_pcb.h>
97 #include <netinet6/in6_pcb.h>
99 #include <netinet/ip_var.h>
100 #include <netinet/tcp.h>
101 #include <netinet/tcp_fsm.h>
102 #include <netinet/tcp_seq.h>
103 #include <netinet/tcp_timer.h>
104 #include <netinet/tcp_timer2.h>
105 #include <netinet/tcp_var.h>
106 #include <netinet/tcpip.h>
108 #include <netinet/tcp_debug.h>
111 #define TCP_TIMER_REXMT 0x01
112 #define TCP_TIMER_PERSIST 0x02
113 #define TCP_TIMER_KEEP 0x04
114 #define TCP_TIMER_2MSL 0x08
115 #define TCP_TIMER_DELACK 0x10
117 static struct tcpcb *tcp_timer_rexmt_handler(struct tcpcb *);
118 static struct tcpcb *tcp_timer_persist_handler(struct tcpcb *);
119 static struct tcpcb *tcp_timer_keep_handler(struct tcpcb *);
120 static struct tcpcb *tcp_timer_2msl_handler(struct tcpcb *);
121 static struct tcpcb *tcp_timer_delack_handler(struct tcpcb *);
123 static const struct tcp_timer {
125 struct tcpcb *(*tt_handler)(struct tcpcb *);
126 } tcp_timer_handlers[] = {
127 { TCP_TIMER_DELACK, tcp_timer_delack_handler },
128 { TCP_TIMER_REXMT, tcp_timer_rexmt_handler },
129 { TCP_TIMER_PERSIST, tcp_timer_persist_handler },
130 { TCP_TIMER_KEEP, tcp_timer_keep_handler },
131 { TCP_TIMER_2MSL, tcp_timer_2msl_handler },
136 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
140 tt = *(int *)oidp->oid_arg1;
141 s = (int)((int64_t)tt * 1000 / hz);
143 error = sysctl_handle_int(oidp, &s, 0, req);
144 if (error || !req->newptr)
147 tt = (int)((int64_t)s * hz / 1000);
151 *(int *)oidp->oid_arg1 = tt;
156 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
157 &tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "Time to establish TCP connection");
160 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle, CTLTYPE_INT|CTLFLAG_RW,
161 &tcp_keepidle, 0, sysctl_msec_to_ticks, "I", "Time before TCP keepalive probes begin");
164 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl, CTLTYPE_INT|CTLFLAG_RW,
165 &tcp_keepintvl, 0, sysctl_msec_to_ticks, "I", "Time between TCP keepalive probes");
168 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DELACKTIME, delacktime,
169 CTLTYPE_INT|CTLFLAG_RW, &tcp_delacktime, 0, sysctl_msec_to_ticks, "I",
170 "Time before a delayed ACK is sent");
173 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl, CTLTYPE_INT|CTLFLAG_RW,
174 &tcp_msl, 0, sysctl_msec_to_ticks, "I", "Maximum segment lifetime");
177 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_min, CTLTYPE_INT|CTLFLAG_RW,
178 &tcp_rexmit_min, 0, sysctl_msec_to_ticks, "I", "Minimum Retransmission Timeout");
181 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_slop, CTLTYPE_INT|CTLFLAG_RW,
182 &tcp_rexmit_slop, 0, sysctl_msec_to_ticks, "I",
183 "Retransmission Timer Slop");
185 static int always_keepalive = 1;
186 SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive, CTLFLAG_RW,
187 &always_keepalive , 0, "Assume SO_KEEPALIVE on all TCP connections");
189 /* max idle probes */
190 int tcp_keepcnt = TCPTV_KEEPCNT;
191 SYSCTL_INT(_net_inet_tcp, OID_AUTO, keepcnt, CTLFLAG_RW,
192 &tcp_keepcnt, 0, "Maximum number of keepalive probes to be sent");
194 /* max idle time in persist */
195 int tcp_maxpersistidle;
198 * Cancel all timers for TCP tp.
201 tcp_canceltimers(struct tcpcb *tp)
203 tcp_callout_stop(tp, tp->tt_2msl);
204 tcp_callout_stop(tp, tp->tt_persist);
205 tcp_callout_stop(tp, tp->tt_keep);
206 tcp_callout_stop(tp, tp->tt_rexmt);
210 * Caller should be in critical section
213 tcp_send_timermsg(struct tcpcb *tp, uint32_t task)
215 struct netmsg_tcp_timer *tmsg = tp->tt_msg;
217 KKASSERT(tmsg != NULL && tmsg->tt_cpuid == mycpuid &&
218 tmsg->tt_tcb != NULL);
220 tmsg->tt_tasks |= task;
221 if (tmsg->tt_msg.lmsg.ms_flags & MSGF_DONE)
222 lwkt_sendmsg(tmsg->tt_msgport, &tmsg->tt_msg.lmsg);
225 int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
226 { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
228 int tcp_syn_backoff_low[TCP_MAXRXTSHIFT + 1] =
229 { 1, 1, 2, 4, 8, 8, 16, 16, 32, 64, 64, 64, 64 };
231 int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
232 { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
234 static int tcp_totbackoff = 511; /* sum of tcp_backoff[] */
236 /* Caller should be in critical section */
237 static struct tcpcb *
238 tcp_timer_delack_handler(struct tcpcb *tp)
240 tp->t_flags |= TF_ACKNOW;
241 tcpstat.tcps_delack++;
247 * TCP timer processing.
250 tcp_timer_delack(void *xtp)
252 struct tcpcb *tp = xtp;
253 struct callout *co = &tp->tt_delack->tc_callout;
256 if (callout_pending(co) || !callout_active(co)) {
260 callout_deactivate(co);
261 tcp_send_timermsg(tp, TCP_TIMER_DELACK);
265 /* Caller should be in critical section */
266 static struct tcpcb *
267 tcp_timer_2msl_handler(struct tcpcb *tp)
274 ostate = tp->t_state;
277 * 2 MSL timeout in shutdown went off. If we're closed but
278 * still waiting for peer to close and connection has been idle
279 * too long, or if 2MSL time is up from TIME_WAIT, delete connection
280 * control block. Otherwise, check again in a bit.
282 if (tp->t_state != TCPS_TIME_WAIT &&
283 (ticks - tp->t_rcvtime) <= tp->t_maxidle) {
284 tcp_callout_reset(tp, tp->tt_2msl, tp->t_keepintvl,
291 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
292 tcp_trace(TA_USER, ostate, tp, NULL, NULL, PRU_SLOWTIMO);
298 tcp_timer_2msl(void *xtp)
300 struct tcpcb *tp = xtp;
301 struct callout *co = &tp->tt_2msl->tc_callout;
304 if (callout_pending(co) || !callout_active(co)) {
308 callout_deactivate(co);
309 tcp_send_timermsg(tp, TCP_TIMER_2MSL);
313 /* Caller should be in critical section */
314 static struct tcpcb *
315 tcp_timer_keep_handler(struct tcpcb *tp)
317 struct tcptemp *t_template;
319 int ostate = tp->t_state;
323 * Keep-alive timer went off; send something
324 * or drop connection if idle for too long.
326 tcpstat.tcps_keeptimeo++;
327 if (tp->t_state < TCPS_ESTABLISHED)
329 if ((always_keepalive || (tp->t_flags & TF_KEEPALIVE) ||
330 (tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE)) &&
331 tp->t_state <= TCPS_CLOSING) {
332 if ((ticks - tp->t_rcvtime) >= tp->t_keepidle + tp->t_maxidle)
335 * Send a packet designed to force a response
336 * if the peer is up and reachable:
337 * either an ACK if the connection is still alive,
338 * or an RST if the peer has closed the connection
339 * due to timeout or reboot.
340 * Using sequence number tp->snd_una-1
341 * causes the transmitted zero-length segment
342 * to lie outside the receive window;
343 * by the protocol spec, this requires the
344 * correspondent TCP to respond.
346 tcpstat.tcps_keepprobe++;
347 t_template = tcp_maketemplate(tp);
349 tcp_respond(tp, t_template->tt_ipgen,
350 &t_template->tt_t, NULL,
351 tp->rcv_nxt, tp->snd_una - 1, 0);
352 tcp_freetemplate(t_template);
354 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepintvl,
357 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepidle,
362 if (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
363 tcp_trace(TA_USER, ostate, tp, NULL, NULL, PRU_SLOWTIMO);
368 tcpstat.tcps_keepdrops++;
369 tp = tcp_drop(tp, ETIMEDOUT);
372 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
373 tcp_trace(TA_USER, ostate, tp, NULL, NULL, PRU_SLOWTIMO);
379 tcp_timer_keep(void *xtp)
381 struct tcpcb *tp = xtp;
382 struct callout *co = &tp->tt_keep->tc_callout;
385 if (callout_pending(co) || !callout_active(co)) {
389 callout_deactivate(co);
390 tcp_send_timermsg(tp, TCP_TIMER_KEEP);
394 /* Caller should be in critical section */
395 static struct tcpcb *
396 tcp_timer_persist_handler(struct tcpcb *tp)
403 ostate = tp->t_state;
406 * Persistance timer into zero window.
407 * Force a byte to be output, if possible.
409 tcpstat.tcps_persisttimeo++;
411 * Hack: if the peer is dead/unreachable, we do not
412 * time out if the window is closed. After a full
413 * backoff, drop the connection if the idle time
414 * (no responses to probes) reaches the maximum
415 * backoff that we would use if retransmitting.
417 if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
418 ((ticks - tp->t_rcvtime) >= tcp_maxpersistidle ||
419 (ticks - tp->t_rcvtime) >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
420 tcpstat.tcps_persistdrop++;
421 tp = tcp_drop(tp, ETIMEDOUT);
425 tp->t_flags |= TF_FORCE;
427 tp->t_flags &= ~TF_FORCE;
431 if (tp && tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
432 tcp_trace(TA_USER, ostate, tp, NULL, NULL, PRU_SLOWTIMO);
438 tcp_timer_persist(void *xtp)
440 struct tcpcb *tp = xtp;
441 struct callout *co = &tp->tt_persist->tc_callout;
444 if (callout_pending(co) || !callout_active(co)){
448 callout_deactivate(co);
449 tcp_send_timermsg(tp, TCP_TIMER_PERSIST);
454 tcp_save_congestion_state(struct tcpcb *tp)
456 tp->snd_cwnd_prev = tp->snd_cwnd;
457 tp->snd_wacked_prev = tp->snd_wacked;
458 tp->snd_ssthresh_prev = tp->snd_ssthresh;
459 tp->snd_recover_prev = tp->snd_recover;
460 if (IN_FASTRECOVERY(tp))
461 tp->t_flags |= TF_WASFRECOVERY;
463 tp->t_flags &= ~TF_WASFRECOVERY;
464 if (tp->t_flags & TF_RCVD_TSTMP) {
465 tp->t_rexmtTS = ticks;
466 tp->t_flags |= TF_FIRSTACCACK;
469 tcp_sack_save_scoreboard(&tp->scb);
474 tcp_revert_congestion_state(struct tcpcb *tp)
476 tp->snd_cwnd = tp->snd_cwnd_prev;
477 tp->snd_wacked = tp->snd_wacked_prev;
478 tp->snd_ssthresh = tp->snd_ssthresh_prev;
479 tp->snd_recover = tp->snd_recover_prev;
480 if (tp->t_flags & TF_WASFRECOVERY)
481 ENTER_FASTRECOVERY(tp);
482 if (tp->t_flags & TF_FASTREXMT) {
483 ++tcpstat.tcps_sndfastrexmitbad;
484 if (tp->t_flags & TF_EARLYREXMT)
485 ++tcpstat.tcps_sndearlyrexmitbad;
487 ++tcpstat.tcps_sndrtobad;
490 tp->snd_nxt = tp->snd_max;
492 tcp_sack_revert_scoreboard(&tp->scb, tp->snd_una);
496 /* Caller should be in critical section */
497 static struct tcpcb *
498 tcp_timer_rexmt_handler(struct tcpcb *tp)
506 ostate = tp->t_state;
509 * Retransmission timer went off. Message has not
510 * been acked within retransmit interval. Back off
511 * to a longer retransmit interval and retransmit one segment.
513 if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
514 tp->t_rxtshift = TCP_MAXRXTSHIFT;
515 tcpstat.tcps_timeoutdrop++;
516 tp = tcp_drop(tp, tp->t_softerror ?
517 tp->t_softerror : ETIMEDOUT);
520 if (tp->t_rxtshift == 1) {
522 * first retransmit; record ssthresh and cwnd so they can
523 * be recovered if this turns out to be a "bad" retransmit.
524 * A retransmit is considered "bad" if an ACK for this
525 * segment is received within RTT/2 interval; the assumption
526 * here is that the ACK was already in flight. See
527 * "On Estimating End-to-End Network Path Properties" by
528 * Allman and Paxson for more details.
530 tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
531 tcp_save_congestion_state(tp);
532 tp->t_flags &= ~(TF_FASTREXMT | TF_EARLYREXMT);
534 if (tp->t_state == TCPS_SYN_SENT || tp->t_state == TCPS_SYN_RECEIVED) {
536 * Record the time that we spent in SYN or SYN|ACK
539 * Needed by RFC3390 and RFC6298.
541 tp->t_rxtsyn += tp->t_rxtcur;
543 /* Throw away SACK blocks on a RTO, as specified by RFC2018. */
544 tcp_sack_cleanup(&tp->scb);
545 tcpstat.tcps_rexmttimeo++;
546 if (tp->t_state == TCPS_SYN_SENT) {
547 if (tcp_low_rtobase) {
548 rexmt = TCP_REXMTVAL(tp) *
549 tcp_syn_backoff_low[tp->t_rxtshift];
551 rexmt = TCP_REXMTVAL(tp) *
552 tcp_syn_backoff[tp->t_rxtshift];
555 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
557 TCPT_RANGESET(tp->t_rxtcur, rexmt,
558 tp->t_rttmin, TCPTV_REXMTMAX);
560 * If losing, let the lower level know and try for
561 * a better route. Also, if we backed off this far,
562 * our srtt estimate is probably bogus. Clobber it
563 * so we'll take the next rtt measurement as our srtt;
564 * move the current srtt into rttvar to keep the current
565 * retransmit times until then.
567 if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
569 if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0)
570 in6_losing(tp->t_inpcb);
573 in_losing(tp->t_inpcb);
574 tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
577 tp->snd_nxt = tp->snd_una;
578 tp->rexmt_high = tp->snd_una;
579 tp->t_flags &= ~TF_SACKRESCUED;
580 tp->snd_recover = tp->snd_max;
582 * Force a segment to be sent.
584 tp->t_flags |= TF_ACKNOW;
586 * If timing a segment in this window, stop the timer.
590 * Close the congestion window down to one segment
591 * (we'll open it by one segment for each ack we get).
592 * Since we probably have a window's worth of unacked
593 * data accumulated, this "slow start" keeps us from
594 * dumping all that data as back-to-back packets (which
595 * might overwhelm an intermediate gateway).
597 * There are two phases to the opening: Initially we
598 * open by one mss on each ack. This makes the window
599 * size increase exponentially with time. If the
600 * window is larger than the path can handle, this
601 * exponential growth results in dropped packet(s)
602 * almost immediately. To get more time between
603 * drops but still "push" the network to take advantage
604 * of improving conditions, we switch from exponential
605 * to linear window opening at some threshhold size.
606 * For a threshhold, we use half the current window
607 * size, truncated to a multiple of the mss.
609 * (the minimum cwnd that will give us exponential
610 * growth is 2 mss. We don't allow the threshhold
614 u_int win = min(tp->snd_wnd, tp->snd_cwnd) / 2 / tp->t_maxseg;
618 tp->snd_cwnd = tp->t_maxseg;
620 tp->snd_ssthresh = win * tp->t_maxseg;
623 EXIT_FASTRECOVERY(tp);
628 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
629 tcp_trace(TA_USER, ostate, tp, NULL, NULL, PRU_SLOWTIMO);
635 tcp_timer_rexmt(void *xtp)
637 struct tcpcb *tp = xtp;
638 struct callout *co = &tp->tt_rexmt->tc_callout;
641 if (callout_pending(co) || !callout_active(co)) {
645 callout_deactivate(co);
646 tcp_send_timermsg(tp, TCP_TIMER_REXMT);
651 tcp_timer_handler(netmsg_t msg)
653 struct netmsg_tcp_timer *tmsg = (struct netmsg_tcp_timer *)msg;
654 const struct tcp_timer *tt;
659 KKASSERT(tmsg->tt_cpuid == mycpuid && tmsg->tt_tcb != NULL);
662 /* Save pending tasks and reset the tasks in message */
663 tmsg->tt_running_tasks = tmsg->tt_tasks;
664 tmsg->tt_prev_tasks = tmsg->tt_tasks;
668 lwkt_replymsg(&tmsg->tt_msg.lmsg, 0);
670 if (tmsg->tt_running_tasks == 0) {
672 * All of the timers are cancelled when the message
673 * is pending; bail out.
679 for (tt = tcp_timer_handlers; tt->tt_handler != NULL; ++tt) {
680 if ((tmsg->tt_running_tasks & tt->tt_task) == 0)
683 tmsg->tt_running_tasks &= ~tt->tt_task;
684 tp = tt->tt_handler(tp);
688 if (tmsg->tt_running_tasks == 0) /* nothing left to do */
696 tcp_create_timermsg(struct tcpcb *tp, struct lwkt_port *msgport)
698 struct netmsg_tcp_timer *tmsg = tp->tt_msg;
700 netmsg_init(&tmsg->tt_msg, NULL, &netisr_adone_rport,
701 MSGF_DROPABLE | MSGF_PRIORITY, tcp_timer_handler);
702 tmsg->tt_cpuid = mycpuid;
703 tmsg->tt_msgport = msgport;
709 tcp_destroy_timermsg(struct tcpcb *tp)
711 struct netmsg_tcp_timer *tmsg = tp->tt_msg;
713 if (tmsg == NULL || /* listen socket */
714 tmsg->tt_tcb == NULL) /* only tcp_attach() is called */
717 KKASSERT(tmsg->tt_cpuid == mycpuid);
719 if ((tmsg->tt_msg.lmsg.ms_flags & MSGF_DONE) == 0) {
721 * This message is still pending to be processed;
724 lwkt_dropmsg(&tmsg->tt_msg.lmsg);
730 tcp_callout_init(struct tcp_callout *tc, uint32_t task)
732 callout_init_mp(&tc->tc_callout);
737 tcp_inittimers(struct tcpcb *tp)
739 tcp_callout_init(tp->tt_rexmt, TCP_TIMER_REXMT);
740 tcp_callout_init(tp->tt_persist, TCP_TIMER_PERSIST);
741 tcp_callout_init(tp->tt_keep, TCP_TIMER_KEEP);
742 tcp_callout_init(tp->tt_2msl, TCP_TIMER_2MSL);
743 tcp_callout_init(tp->tt_delack, TCP_TIMER_DELACK);