netdev - [PATCH 4/6] tcp: transmit any pending data on receipt of 3rd-ack

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Message-ID: <7787ef4a5f96bc9744b4844b2c3a9e7a81a157b3.1747409911.git.jgh@exim.org>
Date: Fri, 16 May 2025 16:55:02 +0100
From: Jeremy Harris <jgh@...m.org>
To: netdev@...r.kernel.org
Cc: linux-api@...r.kernel.org,
	edumazet@...gle.com,
	ncardwell@...gle.com,
	Jeremy Harris <jgh@...m.org>
Subject: [PATCH 4/6] tcp: transmit any pending data on receipt of 3rd-ack

For the non-fastopen case of prelaod, when the 3rd-ack arrives there
will be data on the write queue. Transmit it immediately
by allowing the SYN_SENT state to run the xmit-recovery code.

Signed-off-by: Jeremy Harris <jgh@...m.org>
---
 net/ipv4/tcp_input.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8ec92dec321a..345a08baaf02 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3900,7 +3900,8 @@ static void tcp_xmit_recovery(struct sock *sk, int rexmit)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
-	if (rexmit == REXMIT_NONE || sk->sk_state == TCP_SYN_SENT)
+	if ((rexmit == REXMIT_NONE && sk->sk_state != TCP_SYN_RECV) ||
+	    sk->sk_state == TCP_SYN_SENT)
 		return;
 
 	if (unlikely(rexmit == REXMIT_NEW)) {
-- 
2.49.0