From nobody Fri Oct 31 23:03:14 2025 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 13BC52DEA68; Tue, 28 Oct 2025 08:17:24 +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=1761639445; cv=none; b=AbTYcjt+ISsXqs+10uRKOah5ple8IKxIvNVeXt8FOWNWwRvJJqggHOWJ/GpjetLL+8GRaJROyssjwJB4pLagBOpMWMaN4xoGzoPqDJ0cT7n0yASDeYB+0ZUYbOixlDwydw/vlbuRk91rNQxUQAyi4sTp1dkblxo2CzapxFKepyk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761639445; c=relaxed/simple; bh=yJ6OnFD0p0J2q2ViCKgWUNewRrcdoQHh3ztvy85qnmE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Ufe8qsRuDyKWspR5JGln+/yNCAXqfue1O6uaqJTv9T8zxSpnWIq9IhCC3hL+5H6j7yV9f7h3XPK8nfll7Cs4wdHgeYmIFVZlv9VXdZWrtFRZsMECBr4raS32k/zuM4WzDvAer09boCkXI7vvll9jooWB+hgaVYPgxVWtMyLIkMQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=vAPu/e7X; 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="vAPu/e7X" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60AE9C113D0; Tue, 28 Oct 2025 08:17:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761639444; bh=yJ6OnFD0p0J2q2ViCKgWUNewRrcdoQHh3ztvy85qnmE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=vAPu/e7XntGcsPEN/KZD9G1NbFP84vH19IgqZ27EjaQPKNcGe489i7ixPMBYO94Y2 JjrE4g7bp42tur/bO+pdMMnAic0Vu/DEFsWXaaB7hpUr7woEqibb3TGpY27Q4E5q4A C4WdEzVKScmZqTmACTS51smBVajGsTlDa3QmtQxqID00GFt5oQTYcyTSIHiNOM9gJn aGv7xy9NdFjo1WYfzMuPGvH7K/48uauiVyhNbHFYh0T/sPm50bY4LhgTr/JISg/2KX 4W3o8ZY8Vt09mTVnOGakxYrHdedxv9mW5B5PxIafk7pOM5Hzn0pGBpkcINF7clu/T7 xQvvHVWOHdwWg== From: "Matthieu Baerts (NGI0)" Date: Tue, 28 Oct 2025 09:16:55 +0100 Subject: [PATCH net 4/4] mptcp: zero window probe mib Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251028-net-mptcp-send-timeout-v1-4-38ffff5a9ec8@kernel.org> References: <20251028-net-mptcp-send-timeout-v1-0-38ffff5a9ec8@kernel.org> In-Reply-To: <20251028-net-mptcp-send-timeout-v1-0-38ffff5a9ec8@kernel.org> To: Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Florian Westphal , Yonglong Li Cc: netdev@vger.kernel.org, mptcp@lists.linux.dev, linux-kernel@vger.kernel.org, "Matthieu Baerts (NGI0)" X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1908; i=matttbe@kernel.org; h=from:subject:message-id; bh=L2OKjKKGhGjF8C+8RuWZFoc4maf4q5B5EWamzyvqW0M=; b=owGbwMvMwCVWo/Th0Gd3rumMp9WSGDIZathyAp/Ps5/rtmDn0qMNAfae9c+fcjSJfCpaPTmr6 9iD8DfCHaUsDGJcDLJiiizSbZH5M59X8ZZ4+VnAzGFlAhnCwMUpABPZt52RoedoSO4jCV6jWsep y8L//o2w3Xi/VzXgrcNH+7PrOgU+LmFkuCXK47n/yc65Bcf53q23Ky0N3S6toaN80MTsVb6V0TI XfgA= X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Paolo Abeni Explicitly account for MPTCP-level zero windows probe, to catch hopefully earlier issues alike the one addressed by the previous patch. Reviewed-by: Mat Martineau Signed-off-by: Paolo Abeni Tested-by: Geliang Tang Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/mib.c | 1 + net/mptcp/mib.h | 1 + net/mptcp/protocol.c | 1 + 3 files changed, 3 insertions(+) diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c index 6003e47c770a..171643815076 100644 --- a/net/mptcp/mib.c +++ b/net/mptcp/mib.c @@ -85,6 +85,7 @@ static const struct snmp_mib mptcp_snmp_list[] =3D { SNMP_MIB_ITEM("DssFallback", MPTCP_MIB_DSSFALLBACK), SNMP_MIB_ITEM("SimultConnectFallback", MPTCP_MIB_SIMULTCONNFALLBACK), SNMP_MIB_ITEM("FallbackFailed", MPTCP_MIB_FALLBACKFAILED), + SNMP_MIB_ITEM("WinProbe", MPTCP_MIB_WINPROBE), }; =20 /* mptcp_mib_alloc - allocate percpu mib counters diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h index 309bac6fea32..a1d3e9369fbb 100644 --- a/net/mptcp/mib.h +++ b/net/mptcp/mib.h @@ -88,6 +88,7 @@ enum linux_mptcp_mib_field { MPTCP_MIB_DSSFALLBACK, /* Bad or missing DSS */ MPTCP_MIB_SIMULTCONNFALLBACK, /* Simultaneous connect */ MPTCP_MIB_FALLBACKFAILED, /* Can't fallback due to msk status */ + MPTCP_MIB_WINPROBE, /* MPTCP-level zero window probe */ __MPTCP_MIB_MAX }; =20 diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 2feaf7afba49..49fed273f4dd 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1346,6 +1346,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct= sock *ssk, mpext->dsn64); =20 if (zero_window_probe) { + MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_WINPROBE); mptcp_subflow_ctx(ssk)->rel_write_seq +=3D copy; mpext->frozen =3D 1; if (READ_ONCE(msk->csum_enabled)) --=20 2.51.0