117 static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)  in tcp_mtu_probing()  argument
123 		if (!icsk->icsk_mtup.enabled) {  in tcp_mtu_probing()
124 			icsk->icsk_mtup.enabled = 1;  in tcp_mtu_probing()
125 			icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;  in tcp_mtu_probing()
126 			tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);  in tcp_mtu_probing()
132 			mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;  in tcp_mtu_probing()
136 			icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);  in tcp_mtu_probing()
137 			tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);  in tcp_mtu_probing()
177 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_write_timeout()  local
183 		if (icsk->icsk_retransmits) {  in tcp_write_timeout()
187 			if (tp->syn_data && icsk->icsk_retransmits == 1)  in tcp_write_timeout()
191 		retry_until = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;  in tcp_write_timeout()
203 				if (icsk->icsk_retransmits == sysctl_tcp_retries1)  in tcp_write_timeout()
208 			tcp_mtu_probing(icsk, sk);  in tcp_write_timeout()
215 			const bool alive = icsk->icsk_rto < TCP_RTO_MAX;  in tcp_write_timeout()
227 				  syn_set ? 0 : icsk->icsk_user_timeout, syn_set)) {  in tcp_write_timeout()
238 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_delack_timer_handler()  local
243 	    !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))  in tcp_delack_timer_handler()
246 	if (time_after(icsk->icsk_ack.timeout, jiffies)) {  in tcp_delack_timer_handler()
247 		sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);  in tcp_delack_timer_handler()
250 	icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;  in tcp_delack_timer_handler()
264 		if (!icsk->icsk_ack.pingpong) {  in tcp_delack_timer_handler()
266 			icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1, icsk->icsk_rto);  in tcp_delack_timer_handler()
271 			icsk->icsk_ack.pingpong = 0;  in tcp_delack_timer_handler()
272 			icsk->icsk_ack.ato      = TCP_ATO_MIN;  in tcp_delack_timer_handler()
303 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_probe_timer()  local
309 		icsk->icsk_probes_out = 0;  in tcp_probe_timer()
324 	else if (icsk->icsk_user_timeout &&  in tcp_probe_timer()
325 		 (s32)(tcp_time_stamp - start_ts) > icsk->icsk_user_timeout)  in tcp_probe_timer()
330 		const bool alive = inet_csk_rto_backoff(icsk, TCP_RTO_MAX) < TCP_RTO_MAX;  in tcp_probe_timer()
333 		if (!alive && icsk->icsk_backoff >= max_probes)  in tcp_probe_timer()
339 	if (icsk->icsk_probes_out >= max_probes) {  in tcp_probe_timer()
353 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_fastopen_synack_timer()  local
354 	int max_retries = icsk->icsk_syn_retries ? :  in tcp_fastopen_synack_timer()
383 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_retransmit_timer()  local
438 	if (icsk->icsk_retransmits == 0) {  in tcp_retransmit_timer()
441 		if (icsk->icsk_ca_state == TCP_CA_Recovery) {  in tcp_retransmit_timer()
446 		} else if (icsk->icsk_ca_state == TCP_CA_Loss) {  in tcp_retransmit_timer()
448 		} else if ((icsk->icsk_ca_state == TCP_CA_Disorder) ||  in tcp_retransmit_timer()
466 		if (!icsk->icsk_retransmits)  in tcp_retransmit_timer()
467 			icsk->icsk_retransmits = 1;  in tcp_retransmit_timer()
469 					  min(icsk->icsk_rto, TCP_RESOURCE_PROBE_INTERVAL),  in tcp_retransmit_timer()
489 	icsk->icsk_backoff++;  in tcp_retransmit_timer()
490 	icsk->icsk_retransmits++;  in tcp_retransmit_timer()
505 	    icsk->icsk_retransmits <= TCP_THIN_LINEAR_RETRIES) {  in tcp_retransmit_timer()
506 		icsk->icsk_backoff = 0;  in tcp_retransmit_timer()
507 		icsk->icsk_rto = min(__tcp_set_rto(tp), TCP_RTO_MAX);  in tcp_retransmit_timer()
510 		icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);  in tcp_retransmit_timer()
512 	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX);  in tcp_retransmit_timer()
521 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_write_timer_handler()  local
525 	    !icsk->icsk_pending)  in tcp_write_timer_handler()
528 	if (time_after(icsk->icsk_timeout, jiffies)) {  in tcp_write_timer_handler()
529 		sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);  in tcp_write_timer_handler()
533 	event = icsk->icsk_pending;  in tcp_write_timer_handler()
543 		icsk->icsk_pending = 0;  in tcp_write_timer_handler()
547 		icsk->icsk_pending = 0;  in tcp_write_timer_handler()
595 	struct inet_connection_sock *icsk = inet_csk(sk);  in tcp_keepalive_timer()  local
641 		if ((icsk->icsk_user_timeout != 0 &&  in tcp_keepalive_timer()
642 		    elapsed >= icsk->icsk_user_timeout &&  in tcp_keepalive_timer()
643 		    icsk->icsk_probes_out > 0) ||  in tcp_keepalive_timer()
644 		    (icsk->icsk_user_timeout == 0 &&  in tcp_keepalive_timer()
645 		    icsk->icsk_probes_out >= keepalive_probes(tp))) {  in tcp_keepalive_timer()
651 			icsk->icsk_probes_out++;  in tcp_keepalive_timer()