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[v3,net-next,01/15] tcp: reorganize SYN ECN code

Message ID 20250414131315.97456-2-chia-yu.chang@nokia-bell-labs.com
State New
Headers show
Series [v3,net-next,01/15] tcp: reorganize SYN ECN code | expand

Commit Message

Chia-Yu Chang (Nokia) April 14, 2025, 1:13 p.m. UTC 
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 <chia-yu.chang@nokia-bell-labs.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
---
 net/ipv4/tcp_output.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 13295a59d22e..9a1ab946ff62 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);
 	}
 }