From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 2B6601A6828 for ; Mon, 1 Jun 2026 00:55:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780275321; cv=none; b=QbPppv70UxU6MbETEeYPBT6DsY1NJ9KDuLKHpLoSYYly8cgL1fm/hrPRAPIoTBcgqRUA4WHqPoQMzDsFWathIw1LHC3ee+5riszGsGWWZLsMgeyMHr2ACajQU3Ea7mbgzRfzhSWPlPHlW6L3pixx8COcGxs90wenMFl9cP/WsAQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780275321; c=relaxed/simple; bh=c6JetqvkQVTDb897I5uYUQYngZsg04DZLnGnCpESy8A=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=FyCbnuUXIM1qX1earkAXSDy3GlfJeONhVMIPPragnRrCDgkK9vR5aY2Vc1HQw6IXT1D80wrr5cO3AMP6pJnz7w48BpbbtXKnk3WD5YYSZdUNCOAmodYVJ/nuyHx48/CPOBLgSNEy9dmvzu8fH/jKtfw5PSjngzGQCzRl2OQ9go4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=B1j6L+IL; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="B1j6L+IL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 778AD1F00893; Mon, 1 Jun 2026 00:55:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780275319; bh=ztWUimrmkQaGPjuPS37EDsm1mVQeptDDzCr7ayUgMFI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=B1j6L+ILvYjkJ29gpHRiv/U1z8L06Hz/3vBkPczJzi35etr0Y1LsZwcf+WMw3LOk7 GVjdMq+h7jHvmeDJjYnqwI8/KM3d2EkaY0EtJp3w+Ua8zNS6nw0Opix04lDsCRbg0Q ABQZHPmm6L1qUF4iEiJG3ziWjljEPMWNuBbDrUZizf0P4pjCaTM7SDQ3CVNNzPaL/l LJI1TcH5vSX4E2UsgyegevwYuf1Q4fXczCvAJXay5vnjLNCTd/YtGS66vh8xzIdm7s V77+JdymamlD2X7ck36B/US0QUbREjG+Ax56pQV+4NSuCByi5NB4xKaarFjvrwvWwp QQcy2ZoeGNcDw== Message-ID: <5504ef8c-dc8f-42b7-af4f-9dc856f2ebbc@kernel.org> Date: Mon, 1 Jun 2026 10:55:16 +1000 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH 6.6.y] mptcp: update window_clamp on subflows when SO_RCVBUF is set Content-Language: fr To: Sasha Levin , stable@vger.kernel.org Cc: Gang Yan , Paolo Abeni References: <2026052820-labored-unhinge-12d3@gregkh> <20260601005302.101591-1-sashal@kernel.org> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Sasha, On 01/06/2026 10:53, Sasha Levin wrote: > From: Gang Yan > > [ Upstream commit 3a543ae0e2092d5c2085d5f21f7a7dbafdffea3c ] > > Add __mptcp_subflow_set_rcvbuf() helper to write the subflow sk_rcvbuf, > but also to call the recently added tcp_set_rcvbuf() helper to update > window_clamp. This is needed because the window clap is updated when > scaling_ratio changes, in tcp_measure_rcv_mss(). Until scaling_ratio > changes, the subflow is stuck with the old window clamp which may be > based on a small initial buffer. > > Use this new helper in both mptcp_sol_socket_sync_intval() (setsockopt > path) and sync_socket_options() (new subflow creation path). > > Note that this patch depends on commit b025461303d8 ("tcp: update > window_clamp when SO_RCVBUF is set"): it fixes the issue on TCP side, > but the same fix is needed on MPTCP side as well. See my message on the same patch for v7.0: b025461303d8 should be backported first, but if not, better not to backport this patch. Cheers, Matt -- Sponsored by the NGI0 Core fund.