From patchwork Fri Feb 23 16:14:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts \(NGI0\)" X-Patchwork-Id: 775639 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 607F21339BA; Fri, 23 Feb 2024 16:15:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708704902; cv=none; b=UgQ4+Ii04giTtoRxApBBPd/71AbfvWxssQkr+lu2R+yB6fEyxjXRLVcqVvRBfAQVC0WOxe9kp3qbu6+IXSMdfFgI99bz+r7rX6Ow/FDnBhgLcb4tNDYKA6fGq8G1TjWPkQBy6jO+87ZpPGPaOwRZ8akKH9rV55CIfL9WpTUscF4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708704902; c=relaxed/simple; bh=PMAgnDXhRdjsNXlI4ncyw/rBYaRC4RspgOy+6WHSdWQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=f36yjnYO+ZWsNFYFGUmIGyRo1SWlL0w3q4enB67LR7F7N2Gir6oT/Wow61dHpjwP5tRkGM0k5IIRCMbCnOlT33RqtRmLeeT9q17j32wpckUnUWYarx3kyhXWkine/86odSf0NVB6CGP04W7tdoK+ZiDAHgPdrJyVJHK79x/F1k0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OvgOV89T; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OvgOV89T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74A50C433A6; Fri, 23 Feb 2024 16:14:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708704901; bh=PMAgnDXhRdjsNXlI4ncyw/rBYaRC4RspgOy+6WHSdWQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OvgOV89TM45dHS4EJWpLaYraLn/38cckE4E+eT3MCuPy8SwYHyui++rb7pCzY5+S/ Oxh81DF7cNkEgKb7o3xNv0/s6ZCMZU59P+zYgF9RNAOPW0Ie4DjX4GtHHeWc7KXZVy vhyTFkExltayTKpfA7EJez/XktuIvuVy7e2Iet6XG2KyxfFmT1KpB0VP4QnI7rVgNS 76pM+zysvpM3+dgoDKokjUJxzhTDpGnmoQUq1IbVzXhZc2+RKd2CenDnlKfuC993gQ 89/Qk8C90Q9aLpTE5L/N99QWj1T3vwSf48UM/M8Ip2FtwIEwD7kneSCgBQFLjnmvdN uEp9laIZmgANw== From: "Matthieu Baerts (NGI0)" Date: Fri, 23 Feb 2024 17:14:16 +0100 Subject: [PATCH net 06/10] mptcp: fix potential wake-up event loss Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240223-upstream-net-20240223-misc-fixes-v1-6-162e87e48497@kernel.org> References: <20240223-upstream-net-20240223-misc-fixes-v1-0-162e87e48497@kernel.org> In-Reply-To: <20240223-upstream-net-20240223-misc-fixes-v1-0-162e87e48497@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Florian Westphal , Kishen Maloor , Shuah Khan , Peter Krystad , Christoph Paasch Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, "Matthieu Baerts (NGI0)" , stable@vger.kernel.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2127; i=matttbe@kernel.org; h=from:subject:message-id; bh=g/43TBB3hrKxL6qqQvc2rdv93ajqIAHOvqscdy4uC4w=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBl2MRqCbiEqi91LPDSjON7evvjjl9b9JVJOG87I M1OsGNpSQWJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZdjEagAKCRD2t4JPQmmg c+w9D/93xfwHlSJBSVqSLBT0GCGAdy/yW9dEoRKB5dYOpjitE+UaPM6ahF4MDr+d0oifWMkOvsO d3gKJvtohzSE6ngKrEUVgXuDVaDhT4wSEq5mVAjdF5Y7Z27gHVB3CCkWwc8qm2OmeVV7nE7i37S Rz7rS6ISlpyFwu3mqEFtbN7+i8x/OPU5SuPHftYOsb6tjnIaLSXSNgNmKxDFd7iw0SMrORhwzMM 1k/lixDMZfCPJfwacw1HAhMJfPhaVzWy+aJ8YYSOd4Q1TE4fegKjLpNttYITlUiJ0IEE1sd+xN8 PwTSXDHXkTTPcBY5Bxukzby3/gka8zoawTTsh19TRXF0yUftyi7S+aGftlTgDWRZQvV4chTZ3+P EJ4hIyGQbDvjkHjPoBMOWjZpfAXmGnLJ3BXanibfIUMTTHE0BU1MnGWPERd1ONBLNrqasU0dVcB 6AVr2TocXsR8mBRz9V5YR/Tn6R+MWSaggno9lCEFHQsP33zBi9FUCpzRxH6Nk/zQmDZwn/2bEh7 8NRmVDIqjX16L5Ls+k0InABhdNaGM5UeqI765EXlffFKWP+nVPFC7cV/yDG0JgjpDz+vY/cCnl5 h4P4sMJYRnh1Hgtl09CCB3Fcna1xoGldbRjF96naFtPHpDsTj6uLw3ONv/XRZUsVKqgDyL2SYvB 46QX9oR4Z29LSnw== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Paolo Abeni After the blamed commit below, the send buffer auto-tuning can happen after that the mptcp_propagate_sndbuf() completes - via the delegated action infrastructure. We must check for write space even after such change or we risk missing the wake-up event. Fixes: 8005184fd1ca ("mptcp: refactor sndbuf auto-tuning") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/protocol.h | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 631a7f445f34..07f6242afc1a 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -790,6 +790,16 @@ static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); } +static inline void mptcp_write_space(struct sock *sk) +{ + if (sk_stream_is_writeable(sk)) { + /* pairs with memory barrier in mptcp_poll */ + smp_mb(); + if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) + sk_stream_write_space(sk); + } +} + static inline void __mptcp_sync_sndbuf(struct sock *sk) { struct mptcp_subflow_context *subflow; @@ -808,6 +818,7 @@ static inline void __mptcp_sync_sndbuf(struct sock *sk) /* the msk max wmem limit is * tcp wmem[2] */ WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); + mptcp_write_space(sk); } /* The called held both the msk socket and the subflow socket locks, @@ -838,16 +849,6 @@ static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) local_bh_enable(); } -static inline void mptcp_write_space(struct sock *sk) -{ - if (sk_stream_is_writeable(sk)) { - /* pairs with memory barrier in mptcp_poll */ - smp_mb(); - if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) - sk_stream_write_space(sk); - } -} - void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); #define MPTCP_TOKEN_MAX_RETRIES 4