Lines Matching +full:max +full:- +full:retries
1 // SPDX-License-Identifier: GPL-2.0-only
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Florian La Roche, <flla@stud.uni-sb.de>
34 user_timeout = READ_ONCE(icsk->icsk_user_timeout);
36 return icsk->icsk_rto;
38 elapsed = tcp_time_stamp_ts(tp) - tp->retrans_stamp;
39 if (tp->tcp_usec_ts)
42 remaining = user_timeout - elapsed;
46 return min_t(u32, icsk->icsk_rto, msecs_to_jiffies(remaining));
55 user_timeout = READ_ONCE(icsk->icsk_user_timeout);
56 if (!user_timeout || !icsk->icsk_probes_tstamp)
59 elapsed = tcp_jiffies32 - icsk->icsk_probes_tstamp;
62 remaining = msecs_to_jiffies(user_timeout) - elapsed;
69 * tcp_write_err() - close socket and save error info
77 tcp_done_with_error(sk, READ_ONCE(sk->sk_err_soft) ? : ETIMEDOUT);
82 * tcp_out_of_resources() - Close socket if out of resources
112 if ((s32)(tcp_jiffies32 - tp->lsndtime) > 2*tcp_rto_max(sk) || !do_reset)
116 if (READ_ONCE(sk->sk_err_soft))
122 if ((s32)(tcp_jiffies32 - tp->lsndtime) <= TCP_TIMEWAIT_LEN ||
124 (!tp->snd_wnd && !tp->packets_out))
144 * tcp_orphan_retries() - Returns maximal number of retries on an orphaned socket
150 int retries = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_orphan_retries); /* May be zero. */
153 if (READ_ONCE(sk->sk_err_soft) && !alive)
154 retries = 0;
157 * number of retries. 8 corresponds to >100 seconds with minimal
159 if (retries == 0 && alive)
160 retries = 8;
161 return retries;
170 if (!READ_ONCE(net->ipv4.sysctl_tcp_mtu_probing))
173 if (!icsk->icsk_mtup.enabled) {
174 icsk->icsk_mtup.enabled = 1;
175 icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;
177 mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;
178 mss = min(READ_ONCE(net->ipv4.sysctl_tcp_base_mss), mss);
179 mss = max(mss, READ_ONCE(net->ipv4.sysctl_tcp_mtu_probe_floor));
180 mss = max(mss, READ_ONCE(net->ipv4.sysctl_tcp_min_snd_mss));
181 icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);
183 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
194 timeout = ((2 << boundary) - 1) * rto_base;
196 timeout = ((2 << linear_backoff_thresh) - 1) * rto_base +
197 (boundary - linear_backoff_thresh) * tcp_rto_max(sk);
201 * retransmits_timed_out() - returns true if this connection has timed out
203 * @boundary: max number of retransmissions
210 * after "boundary" unsuccessful, exponentially backed-off
220 if (!inet_csk(sk)->icsk_retransmits)
223 start_ts = tp->retrans_stamp;
227 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
232 if (tp->tcp_usec_ts) {
234 delta = tp->tcp_mstamp - start_ts + jiffies_to_usecs(1);
235 return (s32)(delta - timeout * USEC_PER_MSEC) >= 0;
237 return (s32)(tcp_time_stamp_ts(tp) - start_ts - timeout) >= 0;
249 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
250 if (icsk->icsk_retransmits)
253 retry_until = READ_ONCE(icsk->icsk_syn_retries) ? :
254 READ_ONCE(net->ipv4.sysctl_tcp_syn_retries);
257 if (sk->sk_state == TCP_SYN_SENT)
258 max_retransmits += READ_ONCE(net->ipv4.sysctl_tcp_syn_linear_timeouts);
260 expired = icsk->icsk_retransmits >= max_retransmits;
262 if (retransmits_timed_out(sk, READ_ONCE(net->ipv4.sysctl_tcp_retries1), 0)) {
269 retry_until = READ_ONCE(net->ipv4.sysctl_tcp_retries2);
271 const bool alive = icsk->icsk_rto < tcp_rto_max(sk);
283 READ_ONCE(icsk->icsk_user_timeout));
289 icsk->icsk_retransmits,
290 icsk->icsk_rto, (int)expired);
299 tp->timeout_rehash++;
312 if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))
316 if (tp->compressed_ack) {
322 if (!(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
326 sk_reset_timer(sk, &icsk->icsk_delack_timer,
330 icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;
335 icsk->icsk_ack.ato = min_t(u32, icsk->icsk_ack.ato << 1, icsk->icsk_rto);
341 icsk->icsk_ack.ato = TCP_ATO_MIN;
351 * tcp_delack_timer() - The TCP delayed ACK timeout handler
363 struct sock *sk = &icsk->icsk_inet.sk;
369 if (!(smp_load_acquire(&icsk->icsk_ack.pending) & ICSK_ACK_TIMER) &&
370 !READ_ONCE(tcp_sk(sk)->compressed_ack))
379 if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))
394 if (tp->packets_out || !skb) {
395 WRITE_ONCE(icsk->icsk_probes_out, 0);
396 icsk->icsk_probes_tstamp = 0;
408 if (!icsk->icsk_probes_tstamp) {
409 icsk->icsk_probes_tstamp = tcp_jiffies32;
411 u32 user_timeout = READ_ONCE(icsk->icsk_user_timeout);
414 (s32)(tcp_jiffies32 - icsk->icsk_probes_tstamp) >=
418 max_probes = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_retries2);
424 if (!alive && icsk->icsk_backoff >= max_probes)
430 if (icsk->icsk_probes_out >= max_probes) {
443 if (!icsk->icsk_retransmits) {
444 tp->total_rto_recoveries++;
445 tp->rto_stamp = tcp_time_stamp_ms(tp);
447 WRITE_ONCE(icsk->icsk_retransmits, icsk->icsk_retransmits + 1);
448 tp->total_rto++;
461 req->rsk_ops->syn_ack_timeout(req);
466 max_retries = READ_ONCE(icsk->icsk_syn_retries) ? :
467 READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_synack_retries) + 1;
469 if (req->num_timeout >= max_retries) {
474 if (icsk->icsk_retransmits == 1)
476 /* XXX (TFO) - Unlike regular SYN-ACK retransmit, we ignore error
482 req->num_timeout++;
484 if (!tp->retrans_stamp)
485 tp->retrans_stamp = tcp_time_stamp_ts(tp);
487 req->timeout << req->num_timeout, false);
495 u32 user_timeout = READ_ONCE(icsk->icsk_user_timeout);
510 * and tp->rcv_tstamp might very well have been written recently.
513 rcv_delta = icsk_timeout(icsk) - tp->rcv_tstamp;
521 * tcp_retransmit_timer() - The TCP retransmit timeout handler
539 req = rcu_dereference_protected(tp->fastopen_rsk,
542 WARN_ON_ONCE(sk->sk_state != TCP_SYN_RECV &&
543 sk->sk_state != TCP_FIN_WAIT1);
545 /* Before we receive ACK to our SYN-ACK don't retransmit
551 if (!tp->packets_out)
558 if (!tp->snd_wnd && !sock_flag(sk, SOCK_DEAD) &&
559 !((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))) {
568 rtx_delta = tcp_time_stamp_ts(tp) - (tp->retrans_stamp ?:
569 tcp_skb_timestamp_ts(tp->tcp_usec_ts, skb));
570 if (tp->tcp_usec_ts)
573 if (sk->sk_family == AF_INET) {
574 net_dbg_ratelimited("Probing zero-window on %pI4:%u/%u, seq=%u:%u, recv %ums ago, lasting %ums\n",
575 &inet->inet_daddr, ntohs(inet->inet_dport),
576 inet->inet_num, tp->snd_una, tp->snd_nxt,
577 jiffies_to_msecs(jiffies - tp->rcv_tstamp),
581 else if (sk->sk_family == AF_INET6) {
582 net_dbg_ratelimited("Probing zero-window on %pI6:%u/%u, seq=%u:%u, recv %ums ago, lasting %ums\n",
583 &sk->sk_v6_daddr, ntohs(inet->inet_dport),
584 inet->inet_num, tp->snd_una, tp->snd_nxt,
585 jiffies_to_msecs(jiffies - tp->rcv_tstamp),
603 if (icsk->icsk_retransmits == 0) {
606 if (icsk->icsk_ca_state == TCP_CA_Recovery) {
611 } else if (icsk->icsk_ca_state == TCP_CA_Loss) {
613 } else if ((icsk->icsk_ca_state == TCP_CA_Disorder) ||
614 tp->sacked_out) {
661 * linear-timeout retransmissions into a black hole
663 if (sk->sk_state == TCP_ESTABLISHED &&
664 (tp->thin_lto || READ_ONCE(net->ipv4.sysctl_tcp_thin_linear_timeouts)) &&
666 icsk->icsk_retransmits <= TCP_THIN_LINEAR_RETRIES) {
667 icsk->icsk_backoff = 0;
668 icsk->icsk_rto = clamp(__tcp_set_rto(tp),
671 } else if (sk->sk_state != TCP_SYN_SENT ||
672 tp->total_rto >
673 READ_ONCE(net->ipv4.sysctl_tcp_syn_linear_timeouts)) {
677 icsk->icsk_backoff++;
678 icsk->icsk_rto = min(icsk->icsk_rto << 1, tcp_rto_max(sk));
682 if (retransmits_timed_out(sk, READ_ONCE(net->ipv4.sysctl_tcp_retries1) + 1, 0))
688 /* Called with bottom-half processing disabled.
696 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)) ||
697 !icsk->icsk_pending)
701 sk_reset_timer(sk, &icsk->icsk_retransmit_timer,
706 event = icsk->icsk_pending;
716 smp_store_release(&icsk->icsk_pending, 0);
720 smp_store_release(&icsk->icsk_pending, 0);
730 struct sock *sk = &icsk->icsk_inet.sk;
733 if (!smp_load_acquire(&icsk->icsk_pending))
741 if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &sk->sk_tsq_flags))
751 struct net *net = read_pnet(&inet_rsk(req)->ireq_net);
759 sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
764 sk_stop_timer(sk, &sk->sk_timer);
769 if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))
794 if (sk->sk_state == TCP_LISTEN) {
800 if (sk->sk_state == TCP_FIN_WAIT2 && sock_flag(sk, SOCK_DEAD)) {
801 if (READ_ONCE(tp->linger2) >= 0) {
802 const int tmo = tcp_fin_time(sk) - TCP_TIMEWAIT_LEN;
814 ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)))
820 if (tp->packets_out || !tcp_write_queue_empty(sk))
826 u32 user_timeout = READ_ONCE(icsk->icsk_user_timeout);
833 icsk->icsk_probes_out > 0) ||
835 icsk->icsk_probes_out >= keepalive_probes(tp))) {
842 WRITE_ONCE(icsk->icsk_probes_out, icsk->icsk_probes_out + 1);
851 /* It is tp->rcv_tstamp + keepalive_time_when(tp) */
852 elapsed = keepalive_time_when(tp) - elapsed;
874 if (tp->compressed_ack) {
876 * subtract one from tp->compressed_ack to keep
879 tp->compressed_ack--;
885 &sk->sk_tsq_flags))
899 hrtimer_setup(&tcp_sk(sk)->pacing_timer, tcp_pace_kick, CLOCK_MONOTONIC,
902 hrtimer_setup(&tcp_sk(sk)->compressed_ack_timer, tcp_compressed_ack_kick, CLOCK_MONOTONIC,