[PATCH v14 net-next 01/14] tcp: reorganize SYN ECN code
From: <hidden>
Date: 2025-07-22 09:59:42
Also in:
bpf, linux-doc, linux-kselftest
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Ilpo Järvinen <ij@kernel.org> Prepare for AccECN that needs to have access here on IP ECN field value which is only available after INET_ECN_xmit(). No functional changes. Signed-off-by: Ilpo Järvinen <ij@kernel.org> Signed-off-by: Chia-Yu Chang <redacted> Reviewed-by: Eric Dumazet <edumazet@google.com> --- net/ipv4/tcp_output.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index b616776e3354..caa980c3f25a 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c@@ -350,10 +350,11 @@ static void tcp_ecn_send_syn(struct sock *sk, struct sk_buff *skb) tp->ecn_flags = 0; if (use_ecn) { - TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR; - tcp_ecn_mode_set(tp, TCP_ECN_MODE_RFC3168); if (tcp_ca_needs_ecn(sk) || bpf_needs_ecn) INET_ECN_xmit(sk); + + TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR; + tcp_ecn_mode_set(tp, TCP_ECN_MODE_RFC3168); } }
--
2.34.1