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Tue, 18 Nov 2025 04:30:21 -0800 (PST) Received: from [192.168.88.32] ([212.105.155.41]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-477a9dcd891sm15757525e9.7.2025.11.18.04.30.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Nov 2025 04:30:20 -0800 (PST) Message-ID: <715746f8-d1f0-485a-ab83-2f768722698f@redhat.com> Date: Tue, 18 Nov 2025 13:30:17 +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 v6 net-next 05/14] tcp: ECT_1_NEGOTIATION and NEEDS_ACCECN identifiers 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: <20251114071345.10769-1-chia-yu.chang@nokia-bell-labs.com> <20251114071345.10769-6-chia-yu.chang@nokia-bell-labs.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20251114071345.10769-6-chia-yu.chang@nokia-bell-labs.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 11/14/25 8:13 AM, chia-yu.chang@nokia-bell-labs.com wrote: > From: Chia-Yu Chang > > Two CA module flags are added in this patch related to AccECN negotiation. > First, a new CA module flag (TCP_CONG_NEEDS_ACCECN) defines that the CA > expects to negotiate AccECN functionality using the ECE, CWR and AE flags > in the TCP header. > > Second, during ECN negotiation, ECT(0) in the IP header is used. This patch > enables CA to control whether ECT(0) or ECT(1) should be used on a per-segment > basis. A new flag (TCP_CONG_ECT_1_NEGOTIATION) defines the expected ECT value > in the IP header by the CA when not-yet initialized for the connection. > > The detailed AccECN negotiaotn during the 3WHS can be found in the AccECN spec: > https://tools.ietf.org/id/draft-ietf-tcpm-accurate-ecn-28.txt > > Co-developed-by: Olivier Tilmans > Signed-off-by: Olivier Tilmans > Signed-off-by: Ilpo Järvinen > Signed-off-by: Chia-Yu Chang Acked-by: Paolo Abeni