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Thu, 06 Nov 2025 03:45:47 -0800 (PST) Received: from [192.168.88.32] ([212.105.155.83]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4775ce20ff3sm99192445e9.10.2025.11.06.03.45.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Nov 2025 03:45:47 -0800 (PST) Message-ID: <481523a0-58d3-43c6-9e8b-99c2d7ddf55a@redhat.com> Date: Thu, 6 Nov 2025 12:45:44 +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 07/14] tcp: accecn: handle unexpected AccECN negotiation feedback 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 References: <20251030143435.13003-1-chia-yu.chang@nokia-bell-labs.com> <20251030143435.13003-8-chia-yu.chang@nokia-bell-labs.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20251030143435.13003-8-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: > From: Chia-Yu Chang > > According to Section 3.1.2 of AccECN spec (RFC9768), if a TCP Client > has sent a SYN requesting AccECN feedback with (AE,CWR,ECE) = (1,1,1) > then receives a SYN/ACK with the currently reserved combination > (AE,CWR,ECE) = (1,0,1) but it does not have logic specific to such a > combination, the Client MUST enable AccECN mode as if the SYN/ACK > confirmed that the Server supported AccECN and as if it fed back that > the IP-ECN field on the SYN had arrived unchanged. > > Fixes: 3cae34274c79 ("tcp: accecn: AccECN negotiation"). > Signed-off-by: Chia-Yu Chang Acked-by: Paolo Abeni