tcp: use tcp_reset_xmit_timer()

JIRA: https://issues.redhat.com/browse/RHEL-115191
Upstream Status: linux.git
Conflicts:\
- Hunk difference due to missing commit 8ea731d ("tcp: Make SYN ACK RTO
  tunable by BPF programs with TFO") in c9s.
- Context differences due to missing commits d2a0fc3 ("tcp: fix wrong RTO
  timeout when received SACK reneging") and 9d0c00f ("tcp: rename
  tcp_time_stamp() to tcp_time_stamp_ts()") in c9s.

commit 48b69b4
Author: Eric Dumazet <edumazet@google.com>
Date:   Fri Feb 7 15:28:28 2025 +0000

    tcp: use tcp_reset_xmit_timer()

    In order to reduce TCP_RTO_MAX occurrences, replace:

        inet_csk_reset_xmit_timer(sk, what, when, TCP_RTO_MAX)

    With:

        tcp_reset_xmit_timer(sk, what, when, false);

    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
    Reviewed-by: Neal Cardwell <ncardwell@google.com>
    Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Antoine Tenart <atenart@redhat.com>

Author: atenart

net/ipv4/tcp_fastopen.c

@@ -289,8 +289,8 @@ static struct sock *tcp_fastopen_create_child(struct sock *sk,
 	 * The request socket is not added to the ehash
 	 * because it's been added to the accept queue directly.
 	 */
-	inet_csk_reset_xmit_timer(child, ICSK_TIME_RETRANS,
-				  TCP_TIMEOUT_INIT, TCP_RTO_MAX);
+	tcp_reset_xmit_timer(child, ICSK_TIME_RETRANS,
+			     TCP_TIMEOUT_INIT, false);
 
 	refcount_set(&req->rsk_refcnt, 2);
 

net/ipv4/tcp_input.c

@@ -2205,8 +2205,7 @@ static bool tcp_check_sack_reneging(struct sock *sk, int flag)
 		unsigned long delay = max(usecs_to_jiffies(tp->srtt_us >> 4),
 					  msecs_to_jiffies(10));
 
-		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-					  delay, TCP_RTO_MAX);
+		tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS, delay, false);
 		return true;
 	}
 	return false;
@@ -6254,9 +6253,8 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 		    after(TCP_SKB_CB(skb)->ack_seq, tp->snd_nxt)) {
 			/* Previous FIN/ACK or RST/ACK might be ignored. */
 			if (icsk->icsk_retransmits == 0)
-				inet_csk_reset_xmit_timer(sk,
-						ICSK_TIME_RETRANS,
-						TCP_TIMEOUT_MIN, TCP_RTO_MAX);
+				tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+						     TCP_TIMEOUT_MIN, false);
 			SKB_DR_SET(reason, TCP_INVALID_ACK_SEQUENCE);
 			goto reset_and_undo;
 		}
@@ -6370,8 +6368,8 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 			 */
 			inet_csk_schedule_ack(sk);
 			tcp_enter_quickack_mode(sk, TCP_MAX_QUICKACKS);
-			inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
-						  TCP_DELACK_MAX, TCP_RTO_MAX);
+			tcp_reset_xmit_timer(sk, ICSK_TIME_DACK,
+					     TCP_DELACK_MAX, false);
 			goto consume;
 		}
 		tcp_send_ack(sk);

net/ipv4/tcp_ipv4.c

@@ -446,8 +446,7 @@ void tcp_ld_RTO_revert(struct sock *sk, u32 seq)
 	remaining = icsk->icsk_rto - usecs_to_jiffies(delta_us);
 
 	if (remaining > 0) {
-		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-					  remaining, TCP_RTO_MAX);
+		tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS, remaining, false);
 	} else {
 		/* RTO revert clocked out retransmission.
 		 * Will retransmit now.

net/ipv4/tcp_output.c

@@ -3945,8 +3945,8 @@ int tcp_connect(struct sock *sk)
 	TCP_INC_STATS(sock_net(sk), TCP_MIB_ACTIVEOPENS);
 
 	/* Timer for repeating the SYN until an answer. */
-	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-				  inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
+	tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+			     inet_csk(sk)->icsk_rto, false);
 	return 0;
 }
 EXPORT_SYMBOL(tcp_connect);
@@ -4031,7 +4031,7 @@ void __tcp_send_ack(struct sock *sk, u32 rcv_nxt)
 			icsk->icsk_ack.retry++;
 		inet_csk_schedule_ack(sk);
 		icsk->icsk_ack.ato = TCP_ATO_MIN;
-		inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, delay, TCP_RTO_MAX);
+		tcp_reset_xmit_timer(sk, ICSK_TIME_DACK, delay, false);
 		return;
 	}
 

net/ipv4/tcp_timer.c

@@ -447,8 +447,8 @@ static void tcp_fastopen_synack_timer(struct sock *sk, struct request_sock *req)
 	icsk->icsk_retransmits++;
 	if (!tp->retrans_stamp)
 		tp->retrans_stamp = tcp_time_stamp(tp);
-	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-			  TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX);
+	tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+			  TCP_TIMEOUT_INIT << req->num_timeout, false);
 }
 
 static bool tcp_rtx_probe0_timed_out(const struct sock *sk,
@@ -588,9 +588,9 @@ void tcp_retransmit_timer(struct sock *sk)
 		/* Retransmission failed because of local congestion,
 		 * Let senders fight for local resources conservatively.
 		 */
-		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-					  TCP_RESOURCE_PROBE_INTERVAL,
-					  TCP_RTO_MAX);
+		tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+				     TCP_RESOURCE_PROBE_INTERVAL,
+				     false);
 		goto out;
 	}
 
@@ -633,8 +633,8 @@ void tcp_retransmit_timer(struct sock *sk)
 		/* Use normal (exponential) backoff */
 		icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);
 	}
-	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-				  tcp_clamp_rto_to_user_timeout(sk), TCP_RTO_MAX);
+	tcp_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+			     tcp_clamp_rto_to_user_timeout(sk), false);
 	if (retransmits_timed_out(sk, READ_ONCE(net->ipv4.sysctl_tcp_retries1) + 1, 0))
 		__sk_dst_reset(sk);