From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29395314D2B for ; Thu, 6 Nov 2025 11:45:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762429552; cv=none; b=lkjHpCIT7cp245hwIokiAHVRYwtcsAf1jOpgEKXNPZh9fxlJpUguIM6FrV74i+UKJ5jyfQilsqAtx3M3uhd57FJWzWCrYIguvNOGwVrPr+XkstQwNX5E9qdZwwDyeTEzPI5xBWfdSGfJkypEX3MD4DHlntc5VZUBnDrA9gq552g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762429552; c=relaxed/simple; bh=jIFC1QZiGfv9alFP7RwEchylh/aQZeL7acaxJFCdZbU=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=e81eBBHYwRqAZORwNyK04+3/W5YZ7piDspcDwLlvhVubqSkU9YDz5VWeN9ljJF1TmzqBiQfr3EAsbTy4Hy+qLlsE8OQen+v7w3V8/WwVhAFPwkcDWwe83oKofifflAAN2fcT6Xka8j6eGHNALecnu13lqVRf/Ipn/LaWU2jX0jA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=GIWA4qRL; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=XHlRYePd; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GIWA4qRL"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="XHlRYePd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1762429550; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KkH7CgwKazWdbtvwueZlrKCpxGFwLdOfsSGfy29m5CI=; b=GIWA4qRL1KUeg7j6iQeg7tjqHU1XAynBQ8TiABNUwabzWTRMKveN0XLbvxaZ2jkL39O3Vd tPxSLTjjnII/BeuaWWLBRbldq8cyynXSuPWg0OUypxKCs+Pxn/FAiJ7ZHKQxDGLP0illq/ icYkT+XarCxCqWXHhjx0wejGzbI3RqI= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-552-hmI6xeZtMjOsoyiNvw6ieg-1; Thu, 06 Nov 2025 06:45:49 -0500 X-MC-Unique: hmI6xeZtMjOsoyiNvw6ieg-1 X-Mimecast-MFC-AGG-ID: hmI6xeZtMjOsoyiNvw6ieg_1762429548 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-477563e531cso8461425e9.1 for ; Thu, 06 Nov 2025 03:45:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1762429548; x=1763034348; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:to:subject:user-agent:mime-version:date:message-id:from :to:cc:subject:date:message-id:reply-to; bh=KkH7CgwKazWdbtvwueZlrKCpxGFwLdOfsSGfy29m5CI=; b=XHlRYePdKQiZGkomofSZBegEpmEeekrEKFB5SNyGXUWyTG3ZVzFGaQVF28SCrJcAEa F64dkisCdQswrFCY9YVEiGo0yS5ZH/lxwVv6pD196/k5SGkBLSIga57guo2SzTcVcqVO nbZC5B1/aGqQcG6eCpCtyHsb/5wfRbp0CHHNQkg+UCpP+hDQGbKYuiN4Z+Cf3qs6Fsd1 UWzKhIPJKQkmM/6RHjBGiX4Xvcsc2wBfYrTNliumxdcqhER/ecTPY+HDhk4cHm/+/zMS WyE4WamZ3XmPnta4H767oLrEXWZlv7anmXMUo/IfLIIoxHAAZcx5W3CC9FQHQ3GpEPpM yVEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762429548; x=1763034348; h=content-transfer-encoding:in-reply-to:from:content-language :references:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KkH7CgwKazWdbtvwueZlrKCpxGFwLdOfsSGfy29m5CI=; b=CuU1mDrlf3Xn4+zL6oVTRz3rdxP0KVLUxYKra3pUiJJlQ63j0irZu4oNW6JrcUW9xk Qi/YT/bBowzg6XoaDPc/3NpbMsnLxmve1eZlMQbgafkzZqODC7nZ45tZ7VEPDkugt5aq YwlMxknJMmRwZB9IewIU2PeN9sKlR1+Flx2veJ5bEsI3IIhhGZ/Cnmp6sOSruYZONW1s UqbSFSwAzgOwtEQOx6RCgBHVPG1+lw2BveSF60ahvfgjtnzcsb1eL1uzuhMlCcEoQFfD VX9oPyso0HXOOIADNmdiVJ2MVgvDrD55EcTnISlyGNsady7ROgV0b7JmmY/TSWtY8a/T gfxQ== X-Forwarded-Encrypted: i=1; AJvYcCXLcwL3pfTr61zWaLhGdEUxW+aeP0mJri8xrt6shYOJ+J6F94+Vn7vemcDxT4DcWZbBUxo=@vger.kernel.org X-Gm-Message-State: AOJu0YytsyNbZGTxdeD19eiIgWtO0jARrknMMGSJ15rRvTmhlJ5Ko7dZ EkKvKYSW6Er48fzHw7zRDRPt591r9SR/5nOpUyjG5u+WRf9lyCy7qrVvKLaMnuxdTGBz8waA9wm 2CuFZEzbt25wvVH21AaeIGFm+Hh2FYz1D+UmcmCr+4I2PPxzgkCMNUA== X-Gm-Gg: ASbGncv4epAYvQnSHxpeBuyTz9j+A85ujRdNGu1ZYkYmIHX1QVoFECRzP8m3bLtW7Zu gul25PtM+4WhTT3pqbzOGE1zYRyzoNTSBE1SGvOOk3MZWvwiT/+ArCGCpZ03ibAtox4bco/OGDG JjqPvRRdaCCodm+3CYLnlVxrICxgugdxHXSQM3JXXIPfWjHYinvCg9Rq6p0fkWNV+/6u1WbVZSZ l+h+xdVl4Fw7UQlMg2t4TjFOdKGwtinC+YSc1/ZNyh8s33ETCkoH/M6SenmHdZJmL2cxXBLB34Q CWSw8IDLYtll2Yi8L3+7bcejlZ5KrneY07QJb/PSsmn5y/s9ZoU5D7OiejQkOE6b0Uqq+ehd4hT 5fQ== X-Received: by 2002:a05:600c:530d:b0:477:55ce:f3c2 with SMTP id 5b1f17b1804b1-4775cdc5874mr42667865e9.14.1762429547922; Thu, 06 Nov 2025 03:45:47 -0800 (PST) X-Google-Smtp-Source: AGHT+IG7RHjlVj/e3xHSWVa2A73ABTLq0Y9BUa6x/aDlpI5jqQq8aKEV1qKIM3qTieemuTqo6foEFg== X-Received: by 2002:a05:600c:530d:b0:477:55ce:f3c2 with SMTP id 5b1f17b1804b1-4775cdc5874mr42667565e9.14.1762429547516; 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: bpf@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