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Thu, 06 Nov 2025 03:38:49 -0800 (PST) Received: from [192.168.88.32] ([212.105.155.83]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47764152a13sm13759115e9.13.2025.11.06.03.38.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Nov 2025 03:38:48 -0800 (PST) Message-ID: Date: Thu, 6 Nov 2025 12:38:46 +0100 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 net-next 05/14] tcp: L4S ECT(1) identifier and NEEDS_ACCECN for CC modules To: chia-yu.chang@nokia-bell-labs.com, edumazet@google.com, parav@nvidia.com, linux-doc@vger.kernel.org, corbet@lwn.net, horms@kernel.org, dsahern@kernel.org, kuniyu@google.com, bpf@vger.kernel.org, netdev@vger.kernel.org, dave.taht@gmail.com, jhs@mojatatu.com, kuba@kernel.org, stephen@networkplumber.org, xiyou.wangcong@gmail.com, jiri@resnulli.us, davem@davemloft.net, andrew+netdev@lunn.ch, donald.hunter@gmail.com, ast@fiberby.net, liuhangbin@gmail.com, shuah@kernel.org, linux-kselftest@vger.kernel.org, ij@kernel.org, ncardwell@google.com, koen.de_schepper@nokia-bell-labs.com, g.white@cablelabs.com, ingemar.s.johansson@ericsson.com, mirja.kuehlewind@ericsson.com, cheshire@apple.com, rs.ietf@gmx.at, Jason_Livingood@comcast.com, vidhi_goel@apple.com Cc: Olivier Tilmans References: <20251030143435.13003-1-chia-yu.chang@nokia-bell-labs.com> <20251030143435.13003-6-chia-yu.chang@nokia-bell-labs.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20251030143435.13003-6-chia-yu.chang@nokia-bell-labs.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/30/25 3:34 PM, chia-yu.chang@nokia-bell-labs.com wrote: > diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c > index 7f5df7a71f62..d475f80b2248 100644 > --- a/net/ipv4/tcp_output.c > +++ b/net/ipv4/tcp_output.c > @@ -328,12 +328,17 @@ static void tcp_ecn_send(struct sock *sk, struct sk_buff *skb, > struct tcphdr *th, int tcp_header_len) > { > struct tcp_sock *tp = tcp_sk(sk); > + bool ecn_ect_1; > > if (!tcp_ecn_mode_any(tp)) > return; > > + ecn_ect_1 = tp->ecn_flags & TCP_ECN_ECT_1; > + if (ecn_ect_1 && !tcp_accecn_ace_fail_recv(tp)) > + __INET_ECN_xmit(sk, true); I'm possibly lost, but I can't find ecn_flags TCP_ECN_ECT_1 bit being set here or elsewhere in this series. Also why isn't this chunk under `if (tcp_ecn_mode_accecn(tp))` ? /P