From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 1248E28B7EA for ; Thu, 6 Nov 2025 12:21:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762431711; cv=none; b=Ir0td7GFEZWn89OhCES4Qf7oBIgADocjuSAR0KpbvIwivgFhC0K8C6BDwy4/dYr4KjBIWQBsqGXTZFDGX91KR0pNTioMnUiZarbd/gUp/a+S26goB0qbvy0seLOa783t5AIHU6ANVlnzBk2DTOSPhN7I387aJXQA+uBrgv1aNC4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762431711; c=relaxed/simple; bh=f6B/tbcYYNUY1cwi4BIgQgWXetzxYn720LqQVpZbrbo=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=C7L0ZmBoBihPz4EJdmpl00F4f1snaE8azc38kApPaNLN8kJPskc9UnTsT+jbhAvV4u9fQUJCPRvDghp0+fCqp55jVENF5FlY5lhlv6JCMSKMPq/QCgaqKYWrjLFqKv9lqSjQSRplx389eY3H9pgXttpgMDlnqhmIEbcrDfBeId0= 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=eZa5AE1C; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=HwRLewNE; arc=none smtp.client-ip=170.10.129.124 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="eZa5AE1C"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="HwRLewNE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1762431709; 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=v1N4Cl13V8PNbOQcEwPAAvE71VJRJZSQLqVmISUC4TI=; b=eZa5AE1C/cYEn3pnftu2tKCPblgDKDaAr/uXngjB7P1u8hcvrklzW+ddV3omHw44z2SCem 58HNaEPS/gB+8cvTGIHCX+7auxIaz0Uj/sf165FlGrB0Aj2MUrnF8KK2SRgwawHgIGX6bl r1f6iwwMsbNgNXnj7Q7Q865lynuRiFs= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-617-cKsPU-ZKODGtwVh35WCHOg-1; Thu, 06 Nov 2025 07:21:47 -0500 X-MC-Unique: cKsPU-ZKODGtwVh35WCHOg-1 X-Mimecast-MFC-AGG-ID: cKsPU-ZKODGtwVh35WCHOg_1762431707 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-4776b0ada3dso82515e9.0 for ; Thu, 06 Nov 2025 04:21:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1762431707; x=1763036507; 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=v1N4Cl13V8PNbOQcEwPAAvE71VJRJZSQLqVmISUC4TI=; b=HwRLewNEHvTqY7mk1cOBjONPVvLeUtdefBISOpQgzvn0qyupSNSPaog9I24ycLrsY9 zETL4tv1aefjHExTqRCRYN7svJAg/Lf+0TLlFWFJcQKv7+M8U0i1DFQdP417eW/Tyy6X 05WMJlb+XANCjkrlSR5nZspVfRcuHktdV9MkMnXv4EaLqLp4VnRXgnoWVNrur68Ppzun kHOfdWTpJpXEbc3X+8bLzKAKSGNRqK3vuhZXkaaqK3BtY5K7Aak1XrJKws62Co5jz1h4 HuEpTQ4KlNnBb4Me1mhxT6jlniINN3hyeFeCmw5JQQ4I8i8I4+8aOuUhfl/JJL2zkHlS aB0A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762431707; x=1763036507; 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=v1N4Cl13V8PNbOQcEwPAAvE71VJRJZSQLqVmISUC4TI=; b=ZDQ125YOdNm3cFjHQcOqpK3rHfGAWz9S96ttBb9vnTCopEduZe5jfst5qG8yOSuwKC 2110tEzdceZOOu0WzTwEV7FIHDdzt/FDBVtSwFOAVtZOBiGkpoHx1z4lX4mNGI1xmf5h 2nnUF3y0KtZM0mttAIxgvmv0nbs3fS3QBi62mhHfHuXVMSS5vWlsts1yJCwwOqwqwnDU fzS9Zf5m9gTnLnr51UN5z1GzPqrrvkJ13lJC8BqV+pQ70EMKvQzNYztfWB6ZAM5721SI w/XclH2hDnO5JRjmaD5JAWk8I8RNtZD0kPdRcFPcbEymTK7ttttQG5fusewTYve67gto HuoQ== X-Forwarded-Encrypted: i=1; AJvYcCUKw2+CYVYuCTT8DnYXQdXNS+jJN8K9BJuAEz7t4PCTzGKfhEFnNv/gHmdlOkOeqMTYJUzqUhXQPHr3jXCBsP0=@vger.kernel.org X-Gm-Message-State: AOJu0YwqcnmDe5J9eahNJlsb22WAKRbn3Tiiz3uGqH7FDnv6OfVEFv90 he/Y/L+ydO48hab3HPV9Cqf27Qu/jYMdVYBHw9t4HE2j1Wou6+Od7AWjiUi7UEdBlSC08j8g2v+ G09zwHUEc0zGXUroR1fLLRv+GFEd/c/KgNi5W+Uix6XhRvM9XCyhgdKSrxabyGlJ+YQmdqw== X-Gm-Gg: ASbGncvBNnr1PN+4iR2/SXPHMdfARuuYo3xooM3rAcmRpf3PW2XgOm5gfPKiIwC9X9n nRO3XV8gh0B1bUiGtiQAdOFz/H2V7cqP1t39LhRpxvhEW4pV9qTwDi8hmJttdktLPWqAYirDTUR t2/KraTsLWBhBOg/rExRYNcpf+ozUDtYq1Db3PDXpWmXH12bYZhZ0VbellvaN4QnTkjECSGdKji azc0HgbUaX4hgu+3aunPQ0QIKVAcwiFQWGGUCSAO9jFODbO877FlQ2+VmAiMXHqyL7ywKaZbMQ8 3EYJD6XqKL64TsgNGFl5gG/9NMBCS5iQ84mHrRZHJUJNRkOTvGznfyUMIwAk/GB7Zq7xtdVDRk/ bDg== X-Received: by 2002:a05:6000:4112:b0:429:9272:c1be with SMTP id ffacd0b85a97d-429eb151f1emr2335234f8f.8.1762431706690; Thu, 06 Nov 2025 04:21:46 -0800 (PST) X-Google-Smtp-Source: AGHT+IGhC3gPHF44nNLz6WF4vQ+gEkHlkVJdaQMy0UYsfuedwouhI/V3U2psJ1S8t/e2gVWT4Gn96Q== X-Received: by 2002:a05:6000:4112:b0:429:9272:c1be with SMTP id ffacd0b85a97d-429eb151f1emr2335200f8f.8.1762431706238; Thu, 06 Nov 2025 04:21:46 -0800 (PST) Received: from [192.168.88.32] ([212.105.155.83]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429eb40379esm4634350f8f.9.2025.11.06.04.21.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Nov 2025 04:21:45 -0800 (PST) Message-ID: Date: Thu, 6 Nov 2025 13:21:43 +0100 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 net-next 13/14] tcp: accecn: detect loss ACK w/ AccECN option and add TCP_ACCECN_OPTION_PERSIST 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> <20251030143435.13003-14-chia-yu.chang@nokia-bell-labs.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20251030143435.13003-14-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 > > Detect spurious retransmission of a previously sent ACK carrying the > AccECN option after the second retransmission. Since this might be caused > by the middlebox dropping ACK with options it does not recognize, disable > the sending of the AccECN option in all subsequent ACKs. This patch > follows Section 3.2.3.2.2 of AccECN spec (RFC9768). > > Also, a new AccECN option sending mode is added to tcp_ecn_option sysctl: > (TCP_ECN_OPTION_PERSIST), which ignores the AccECN fallback policy and > persistently sends AccECN option once it fits into TCP option space. > > Signed-off-by: Chia-Yu Chang Acked-by: Paolo Abeni