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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="j/TLHk7y"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E8EFC606A319; Mon, 19 Oct 2026 18:20:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=j/TLHk7y Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D39E1F000C4; Mon, 19 Oct 2026 18:20:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792434033; bh=D3SldSbaQcK9BT6fQjX4soK/kQ94ywZREqUfmYS3SHw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=j/TLHk7y22rb5OrfydcogyRvy8s2e6TcJuwpNqvBC2th6HN6IBWtkIlWrIeAZYrkg UUnzqrmzBFPucB1+KIP6mU4L+rmHnH4LcAsyR4N3l7AuLm9uMnwqqsRJn3VTi1YQqS AxBitbwq2bYl6cd4cDhytqYUF6vDMtI0cch034LUKMTa1+ZX/pWvGKBw7cqkRIXMKJ u3Aj18wNdgqEAqBshzb0GXNAwuDQc0NzqpYmtDsi0bbYMOfyqKgEU1bOAyYLEot6o2 a/T23LlLXlEpglO2aoEe5lkfSJwjhSciwyqKAm7mJ+ZW0sQKec4bdO7IXxOAV8Rcy1 HWTial6XZsK/w== Message-ID: Date: Mon, 19 Oct 2026 20:20:30 +0200 X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH 6.1.y] mptcp: move the OoO check back into __mptcp_try_fallback() Content-Language: fr To: Abdul Wasey , stable@vger.kernel.org Cc: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , Paolo Abeni References: <20261019111559.2063342-1-w453y.me@gmail.com> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Abdul, On 19/10/2026 13:15, Abdul Wasey wrote: > The 6.1.y backport of upstream commit 1bba3f219c5e ("mptcp: do not > fallback when OoO is present") put the out-of-order queue check > in __mptcp_finish_join() instead of __mptcp_try_fallback(). > > So the fix itself is missing, as fallback still happens with OoO data > queued. Worse, the passive side now refuses every MP_JOIN while its > OoO queue is not empty, which is the normal state of a connection > already sending data over more than one subflow. The joining subflow > is reset, so such a connection can't add a new path, and a path that > comes back after an outage can't rejoin while data is in flight. > > Move the check to __mptcp_try_fallback(), as upstream does. On this > branch that function is in protocol.h. The fix here looks good to me, thank you! Reviewed-by: Matthieu Baerts (NGI0) Cheers, Matt -- Sponsored by the NGI0 Core fund.