tcp: call tcp_measure_rcv_mss() for ooo packets

[ Upstream commit 38d7e444336567bae1c7b21fc18b7ceaaa5643a0 ]

tcp_measure_rcv_mss() is used to update icsk->icsk_ack.rcv_mss
(tcpi_rcv_mss in tcp_info) and tp->scaling_ratio.

Calling it from tcp_data_queue_ofo() makes sure these
fields are updated, and permits a better tuning
of sk->sk_rcvbuf, in the case a new flow receives many ooo
packets.

Fixes: dfa2f0483360 ("tcp: get rid of sysctl_tcp_adv_win_scale")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250711114006.480026-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8520c43726e2d711c3356e8fcd04868f20b7e396..c6d00817ad3fd90dff98708a3dd0462bbe021c2e 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4941,6 +4941,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
                return;
        }
 
+       tcp_measure_rcv_mss(sk, skb);
        /* Disable header prediction. */
        tp->pred_flags = 0;
        inet_csk_schedule_ack(sk);