netdev - [PATCH v4 net-next 05/14] tcp: reorganize SYN ECN code

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Message-Id: <20241021215910.59767-6-chia-yu.chang@nokia-bell-labs.com>
Date: Mon, 21 Oct 2024 23:59:01 +0200
From: chia-yu.chang@...ia-bell-labs.com
To: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org,
        netfilter-devel@...r.kernel.org, kadlec@...filter.org,
        coreteam@...filter.org, pablo@...filter.org, bpf@...r.kernel.org,
        joel.granados@...nel.org, linux-fsdevel@...r.kernel.org,
        kees@...nel.org, mcgrof@...nel.org, ij@...nel.org,
        ncardwell@...gle.com, koen.de_schepper@...ia-bell-labs.com,
        g.white@...leLabs.com, ingemar.s.johansson@...csson.com,
        mirja.kuehlewind@...csson.com, cheshire@...le.com, rs.ietf@....at,
        Jason_Livingood@...cast.com, vidhi_goel@...le.com
Cc: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
Subject: [PATCH v4 net-next 05/14] tcp: reorganize SYN ECN code

From: Ilpo Järvinen <ij@...nel.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@...nel.org>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.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 45cb67c635be..64d47c18255f 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -347,10 +347,11 @@ 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;
-		tp->ecn_flags = TCP_ECN_OK;
 		if (tcp_ca_needs_ecn(sk) || bpf_needs_ecn)
 			INET_ECN_xmit(sk);
+
+		TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR;
+		tp->ecn_flags = TCP_ECN_OK;
 	}
 }
 
-- 
2.34.1