netdev - [PATCH v5 net-next 10/13] tcp: AccECN support to tcp_add

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Message-Id: <20241105100647.117346-11-chia-yu.chang@nokia-bell-labs.com>
Date: Tue,  5 Nov 2024 11:06:44 +0100
From: chia-yu.chang@...ia-bell-labs.com
To: netdev@...r.kernel.org, dsahern@...il.com, davem@...emloft.net,
        edumazet@...gle.com, dsahern@...nel.org, pabeni@...hat.com,
        joel.granados@...nel.org, kuba@...nel.org, andrew+netdev@...n.ch,
        horms@...nel.org, pablo@...filter.org, kadlec@...filter.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.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 v5 net-next 10/13] tcp: AccECN support to tcp_add_backlog

From: Ilpo Järvinen <ij@...nel.org>

AE flag needs to be preserved for AccECN.

Signed-off-by: Ilpo Järvinen <ij@...nel.org>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
---
 net/ipv4/tcp_ipv4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 536767723584..a13d6745d92b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2055,7 +2055,8 @@ bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb,
 	    !((TCP_SKB_CB(tail)->tcp_flags &
 	      TCP_SKB_CB(skb)->tcp_flags) & TCPHDR_ACK) ||
 	    ((TCP_SKB_CB(tail)->tcp_flags ^
-	      TCP_SKB_CB(skb)->tcp_flags) & (TCPHDR_ECE | TCPHDR_CWR)) ||
+	      TCP_SKB_CB(skb)->tcp_flags) &
+	     (TCPHDR_ECE | TCPHDR_CWR | TCPHDR_AE)) ||
 	    !tcp_skb_can_collapse_rx(tail, skb) ||
 	    thtail->doff != th->doff ||
 	    memcmp(thtail + 1, th + 1, hdrlen - sizeof(*th)))
-- 
2.34.1