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Thu, 06 Nov 2025 03:08:12 -0800 (PST) Received: from [192.168.88.32] ([212.105.155.83]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429eb477226sm4275998f8f.24.2025.11.06.03.08.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Nov 2025 03:08:12 -0800 (PST) Message-ID: <8ac38ae2-74fc-45a1-88fb-4edd124ab9c3@redhat.com> Date: Thu, 6 Nov 2025 12:08:08 +0100 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 net-next 02/14] gro: flushing when CWR is set negatively affects AccECN From: Paolo Abeni 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> <20251030143435.13003-3-chia-yu.chang@nokia-bell-labs.com> <8ad4ca21-5b81-415b-b16c-6cc4b668921c@redhat.com> Content-Language: en-US In-Reply-To: <8ad4ca21-5b81-415b-b16c-6cc4b668921c@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 11/6/25 12:01 PM, Paolo Abeni wrote: > On 10/30/25 3:34 PM, chia-yu.chang@nokia-bell-labs.com wrote: >> From: Ilpo Järvinen >> >> As AccECN may keep CWR bit asserted due to different >> interpretation of the bit, flushing with GRO because of >> CWR may effectively disable GRO until AccECN counter >> field changes such that CWR-bit becomes 0. >> >> There is no harm done from not immediately forwarding the >> CWR'ed segment with RFC3168 ECN. >> >> Signed-off-by: Ilpo Järvinen >> Signed-off-by: Chia-Yu Chang > > Please provide a test/update the existing one to cover this case or move > to a later series. Possibly both :) Whoops, sorry. I'm looking at the patch in order and when I wrote the above I haven't seen yet patch 4/14. Please ignore. /P