[PATCH net-next v2 4/6] tcp: transmit any pending data on receipt of 3rd-ack
From: Jeremy Harris <hidden>
Date: 2025-05-21 11:49:52
Also in:
linux-api
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
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 <redacted> --- 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