102 static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)  in tcp_mtu_probing()  argument
108 		if (!icsk->icsk_mtup.enabled) {  in tcp_mtu_probing()
109 			icsk->icsk_mtup.enabled = 1;  in tcp_mtu_probing()
110 			icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;  in tcp_mtu_probing()
111 			tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);  in tcp_mtu_probing()
117 			mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;  in tcp_mtu_probing()
120 			icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);  in tcp_mtu_probing()
121 			tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);  in tcp_mtu_probing()
161 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_write_timeout()  local
167 		if (icsk->icsk_retransmits) {  in tcp_write_timeout()
171 			if (tp->syn_data && icsk->icsk_retransmits == 1)  in tcp_write_timeout()
175 		retry_until = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;  in tcp_write_timeout()
187 				if (icsk->icsk_retransmits == sysctl_tcp_retries1)  in tcp_write_timeout()
192 			tcp_mtu_probing(icsk, sk);  in tcp_write_timeout()
199 			const bool alive = icsk->icsk_rto < TCP_RTO_MAX;  in tcp_write_timeout()
211 				  syn_set ? 0 : icsk->icsk_user_timeout, syn_set)) {  in tcp_write_timeout()
222 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_delack_timer_handler()  local
226 	if (sk->sk_state == TCP_CLOSE || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))  in tcp_delack_timer_handler()
229 	if (time_after(icsk->icsk_ack.timeout, jiffies)) {  in tcp_delack_timer_handler()
230 		sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);  in tcp_delack_timer_handler()
233 	icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;  in tcp_delack_timer_handler()
247 		if (!icsk->icsk_ack.pingpong) {  in tcp_delack_timer_handler()
249 			icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1, icsk->icsk_rto);  in tcp_delack_timer_handler()
254 			icsk->icsk_ack.pingpong = 0;  in tcp_delack_timer_handler()
255 			icsk->icsk_ack.ato      = TCP_ATO_MIN;  in tcp_delack_timer_handler()
286 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_probe_timer()  local
292 		icsk->icsk_probes_out = 0;  in tcp_probe_timer()
307 	else if (icsk->icsk_user_timeout &&  in tcp_probe_timer()
308 		 (s32)(tcp_time_stamp - start_ts) > icsk->icsk_user_timeout)  in tcp_probe_timer()
313 		const bool alive = inet_csk_rto_backoff(icsk, TCP_RTO_MAX) < TCP_RTO_MAX;  in tcp_probe_timer()
316 		if (!alive && icsk->icsk_backoff >= max_probes)  in tcp_probe_timer()
322 	if (icsk->icsk_probes_out > max_probes) {  in tcp_probe_timer()
336 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_fastopen_synack_timer()  local
337 	int max_retries = icsk->icsk_syn_retries ? :  in tcp_fastopen_synack_timer()
366 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_retransmit_timer()  local
421 	if (icsk->icsk_retransmits == 0) {  in tcp_retransmit_timer()
424 		if (icsk->icsk_ca_state == TCP_CA_Recovery) {  in tcp_retransmit_timer()
429 		} else if (icsk->icsk_ca_state == TCP_CA_Loss) {  in tcp_retransmit_timer()
431 		} else if ((icsk->icsk_ca_state == TCP_CA_Disorder) ||  in tcp_retransmit_timer()
449 		if (!icsk->icsk_retransmits)  in tcp_retransmit_timer()
450 			icsk->icsk_retransmits = 1;  in tcp_retransmit_timer()
452 					  min(icsk->icsk_rto, TCP_RESOURCE_PROBE_INTERVAL),  in tcp_retransmit_timer()
472 	icsk->icsk_backoff++;  in tcp_retransmit_timer()
473 	icsk->icsk_retransmits++;  in tcp_retransmit_timer()
488 	    icsk->icsk_retransmits <= TCP_THIN_LINEAR_RETRIES) {  in tcp_retransmit_timer()
489 		icsk->icsk_backoff = 0;  in tcp_retransmit_timer()
490 		icsk->icsk_rto = min(__tcp_set_rto(tp), TCP_RTO_MAX);  in tcp_retransmit_timer()
493 		icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);  in tcp_retransmit_timer()
495 	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX);  in tcp_retransmit_timer()
504 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_write_timer_handler()  local
507 	if (sk->sk_state == TCP_CLOSE || !icsk->icsk_pending)  in tcp_write_timer_handler()
510 	if (time_after(icsk->icsk_timeout, jiffies)) {  in tcp_write_timer_handler()
511 		sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);  in tcp_write_timer_handler()
515 	event = icsk->icsk_pending;  in tcp_write_timer_handler()
525 		icsk->icsk_pending = 0;  in tcp_write_timer_handler()
529 		icsk->icsk_pending = 0;  in tcp_write_timer_handler()
577 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_keepalive_timer()  local
622 		if ((icsk->icsk_user_timeout != 0 &&  in tcp_keepalive_timer()
623 		    elapsed >= icsk->icsk_user_timeout &&  in tcp_keepalive_timer()
624 		    icsk->icsk_probes_out > 0) ||  in tcp_keepalive_timer()
625 		    (icsk->icsk_user_timeout == 0 &&  in tcp_keepalive_timer()
626 		    icsk->icsk_probes_out >= keepalive_probes(tp))) {  in tcp_keepalive_timer()
632 			icsk->icsk_probes_out++;  in tcp_keepalive_timer()