From nobody Fri Nov 22 01:23:27 2024 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 68C1018562A; Mon, 12 Aug 2024 15:51:11 +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=1723477871; cv=none; b=KUBV095Z4l8vxh2QkL4itGHUQhZMhyMdNHjPOeOBdunHWjZswYtFxdmrhMqZeynzW1O2xkbvXsUh/aOyM5oQ26zznoC8/Q2XLuMleiFtdt/0qAGGH4Lz7ti0DJ960tu41U/gFy1eYwOt/uy/Hn9bqOq43Ys4MMTncVA5k4pVq0g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723477871; c=relaxed/simple; bh=d8OHa3i8Gjc72PnPATNDO2R29h73iX/ZaJ5N2xfkHlQ=; h=Subject:To:Cc:From:Date:In-Reply-To:Message-ID:MIME-Version: Content-Type; b=dNHYQGtkEH8mOj1PFqFRt3P14flB92J99QzQMVRfHnTnZL8Feu5PgSRK3kPWhU8jOuQi/LUm9hfh7zsWTpya/QnMEIiK3lSMHAOX6OdE1gu0QN7tSVqARfnjTlGVVuIK7sdJnZ1j9EtE2+Mo7uGc8ScWB6fxq4IBAKEWt4hzfDU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=TT4mqkCg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="TT4mqkCg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80646C4AF0D; Mon, 12 Aug 2024 15:51:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1723477871; bh=d8OHa3i8Gjc72PnPATNDO2R29h73iX/ZaJ5N2xfkHlQ=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=TT4mqkCgpRaL5XuENEAvb5eHbQeP2CSq/Xefa5CMo4jojdlacbWDV8etggRCarq0Z 94wubHhY1IWxvYKCeg0RM/eP0gkqYp01Ev0rm2HD2Gr6TiFOwt7ZAKH+bGLrJo1kHT /bNaMId5m74PbQpvWNmQB+QXXmyBzNc9BQaZabsM= Subject: Patch "mptcp: pm: don't try to create sf if alloc failed" has been added to the 6.6-stable tree To: gregkh@linuxfoundation.org,kuba@kernel.org,martineau@kernel.org,matttbe@kernel.org,mptcp@lists.linux.dev,pabeni@redhat.com Cc: From: Date: Mon, 12 Aug 2024 17:51:00 +0200 In-Reply-To: <20240812153050.573404-9-matttbe@kernel.org> Message-ID: <2024081200-tweed-compactly-b5a2@gregkh> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-stable: commit X-Patchwork-Hint: ignore Content-Type: text/plain; charset="utf-8" This is a note to let you know that I've just added the patch titled mptcp: pm: don't try to create sf if alloc failed to the 6.6-stable tree which can be found at: http://www.kernel.org/git/?p=3Dlinux/kernel/git/stable/stable-queue.git= ;a=3Dsummary The filename of the patch is: mptcp-pm-don-t-try-to-create-sf-if-alloc-failed.patch and it can be found in the queue-6.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From stable+bounces-66752-greg=3Dkroah.com@vger.kernel.org Mon Aug 12 17:32= :50 2024 From: "Matthieu Baerts (NGI0)" Date: Mon, 12 Aug 2024 17:30:53 +0200 Subject: mptcp: pm: don't try to create sf if alloc failed To: mptcp@lists.linux.dev, stable@vger.kernel.org, gregkh@linuxfoundation.o= rg Cc: "Matthieu Baerts (NGI0)" , Paolo Abeni , Mat Martineau , Jakub Kicinski Message-ID: <20240812153050.573404-9-matttbe@kernel.org> From: "Matthieu Baerts (NGI0)" commit cd7c957f936f8cb80d03e5152f4013aae65bd986 upstream. It sounds better to avoid wasting cycles and / or put extreme memory pressure on the system by trying to create new subflows if it was not possible to add a new item in the announce list. While at it, a warning is now printed if the entry was already in the list as it should not happen with the in-kernel path-manager. With this PM, mptcp_pm_alloc_anno_list() should only fail in case of memory pressure. Fixes: b6c08380860b ("mptcp: remove addr and subflow in PM netlink") Cc: stable@vger.kernel.org Suggested-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20240731-upstream-net-20240731-mptcp-endp-su= bflow-signal-v1-4-c8a9b036493b@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman --- net/mptcp/pm_netlink.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -353,7 +353,7 @@ bool mptcp_pm_alloc_anno_list(struct mpt add_entry =3D mptcp_lookup_anno_list_by_saddr(msk, addr); =20 if (add_entry) { - if (mptcp_pm_is_kernel(msk)) + if (WARN_ON_ONCE(mptcp_pm_is_kernel(msk))) return false; =20 sk_reset_timer(sk, &add_entry->add_timer, @@ -563,8 +563,6 @@ static void mptcp_pm_create_subflow_or_s =20 /* check first for announce */ if (msk->pm.add_addr_signaled < add_addr_signal_max) { - local =3D select_signal_address(pernet, msk); - /* due to racing events on both ends we can reach here while * previous add address is still running: if we invoke now * mptcp_pm_announce_addr(), that will fail and the @@ -575,11 +573,15 @@ static void mptcp_pm_create_subflow_or_s if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL)) return; =20 + local =3D select_signal_address(pernet, msk); if (!local) goto subflow; =20 + /* If the alloc fails, we are on memory pressure, not worth + * continuing, and trying to create subflows. + */ if (!mptcp_pm_alloc_anno_list(msk, &local->addr)) - goto subflow; + return; =20 __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); msk->pm.add_addr_signaled++; Patches currently in stable-queue which might be from kroah.com@vger.kernel= .org are queue-6.6/mptcp-pm-don-t-try-to-create-sf-if-alloc-failed.patch queue-6.6/selftests-mptcp-join-ability-to-invert-add_addr-check.patch queue-6.6/revert-selftests-mptcp-simult-flows-mark-unbalanced-tests-as-flak= y.patch queue-6.6/mptcp-pm-do-not-ignore-subflow-if-signal-flag-is-also-set.patch queue-6.6/selftests-mptcp-join-test-both-signal-subflow.patch queue-6.6/mptcp-pm-reduce-indentation-blocks.patch