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[176.103.220.4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48541b7f3cdsm67159225e9.14.2026.03.10.01.58.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Mar 2026 01:58:08 -0700 (PDT) From: Stefano Brivio To: Simon Baatz via B4 Relay Cc: gmbnomis@gmail.com, Eric Dumazet , Neal Cardwell , Kuniyuki Iwashima , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan , David Ahern , Jon Maloy , Jason Xing , mfreemon@cloudflare.com, Shuah Khan , Matthieu Baerts , Mat Martineau , Geliang Tang , netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, mptcp@lists.linux.dev Subject: Re: [PATCH net-next v3 1/6] tcp: implement RFC 7323 window retraction receiver requirements Message-ID: <20260310095806.121d198f@elisabeth> In-Reply-To: <20260309-tcp_rfc7323_retract_wnd_rfc-v3-1-4c7f96b1ec69@gmail.com> References: <20260309-tcp_rfc7323_retract_wnd_rfc-v3-0-4c7f96b1ec69@gmail.com> <20260309-tcp_rfc7323_retract_wnd_rfc-v3-1-4c7f96b1ec69@gmail.com> Organization: Red Hat X-Mailer: Claws Mail 4.2.0 (GTK 3.24.49; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Date: Tue, 10 Mar 2026 09:58:07 +0100 (CET) Simon, On Mon, 09 Mar 2026 09:02:26 +0100 Simon Baatz via B4 Relay wrote: > [...] > > diff --git a/include/linux/tcp.h b/include/linux/tcp.h > index f72eef31fa23cc584f2f0cefacdc35cae43aa52d..73aa2e0ccd1d7a6314a00c27950b019b62a3851c 100644 > --- a/include/linux/tcp.h > +++ b/include/linux/tcp.h > @@ -316,6 +316,9 @@ struct tcp_sock { > */ > u32 app_limited; /* limited until "delivered" reaches this val */ > u32 rcv_wnd; /* Current receiver window */ > + u32 rcv_mwnd_seq; /* Maximum window sequence number (RFC 7323, > + * section 2.4, receiver requirements) > + */ I didn't follow the rest of the discussion but, at this point, what does this mean for applications (CRIU, passt) dumping/restoring socket data? Do they have to adapt? I couldn't find this bit of information anywhere in v3. -- Stefano