From nobody Sat Jun 27 16:03:11 2026 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 3FF68271A94 for ; Tue, 14 Apr 2026 13:34:17 +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=1776173657; cv=none; b=UyjUq29/OY7quhzKb49asMD8JnQHPZ7o3mxM0op00dGxjIRuv/96rMr8bae9vn4QQriOpwE2rXJ2m9QcKyqcnXSEZoGLqsauP9HJKwGOxvpUU5Zjt0yge8qHEh2IDZU5Df03hq91w5r2nj1uc1Q3N39RTZ8gUN9LMW9eLki7d3U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776173657; c=relaxed/simple; bh=jXEpLOQ67t49RysWKZgvu3qP8jtz8NSTjoKZIw5ytXE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=FgExLMF/+tPBY+gi7r9UZk+MUwfBjXYw8kpImHbt6EA6kLgzP8i44bJbjMdfWhWUjaE5wnMwdgwUENgPWuiWVMJIsBFHKgDI3hGrS8IxYEDzr7/+2Jhf2b8fz0r1YaQTuKc0s6fbkjxM743LNM8hCjto0Ot6XycMpEk0a91QLVY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ukAdYywD; 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="ukAdYywD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B81D1C2BCB0; Tue, 14 Apr 2026 13:34:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776173657; bh=jXEpLOQ67t49RysWKZgvu3qP8jtz8NSTjoKZIw5ytXE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ukAdYywDQnkZDhnrxiBAR5DNCbb9r6vzYp6EDwRuVh3iiYkX/CZ55KROVEZL7sHLk Qmya/OZKqUkSP0RfyvW7Rw/SLC7sAdrcmbgfSm0JFF3WUe0dyqOqIatE9hZaZnKa2g lD4Yvb8b7T7yGmzYKwKPUSW+zzeXj40m+whS/u6VdKpgP5AeVYK8oyoG5QM8pFPEoY nYKhFJH2savSOjbilbL5QEdn0l6tYHhToODw6uAba4FEKEOuc3Q2OUQL3MAyteumKj 9eTK3+J84/EDfA2pDAW5gtHCk6odjkgjuqY/VajynDEbNnibCY81WW1zpuywMAMAzI 4wE7Po+4PQ8Sw== From: "Matthieu Baerts (NGI0)" Date: Tue, 14 Apr 2026 15:34:00 +0200 Subject: [PATCH mptcp-net v4 07/20] mptcp: pm: ADD_ADDR rtx: skip inactive subflows Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260414-mptcp-inc-limits-v4-7-78274edda5dd@kernel.org> References: <20260414-mptcp-inc-limits-v4-0-78274edda5dd@kernel.org> In-Reply-To: <20260414-mptcp-inc-limits-v4-0-78274edda5dd@kernel.org> To: MPTCP Upstream Cc: "Matthieu Baerts (NGI0)" X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1857; i=matttbe@kernel.org; h=from:subject:message-id; bh=jXEpLOQ67t49RysWKZgvu3qP8jtz8NSTjoKZIw5ytXE=; b=owGbwMvMwCVWo/Th0Gd3rumMp9WSGDLvOfnUq9kcKO/TFWP56ujxp8TwSxBT7L/HVp3zNqtrn 7I5vPdWRykLgxgXg6yYIot0W2T+zOdVvCVefhYwc1iZQIYwcHEKwER0NzIyTA77dL6+h2eTR6uj 9sOmjoz+zZIbJ3TvfvRTTiFHdHfBNYZ/tu/Y5D4uniHHsMb0g/1tVpkVtlckH8jNzku3cvI92if PCgA= X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 When looking at the maximum RTO amongst the subflows, inactive subflows were taken into account: that includes stale ones, and the initial one if it has been already been closed. Unusable subflows are now simply skipped. Stale ones are used as an alternative: if there are only stale ones, to take their maximum RTO and avoid to eventually fallback to net.mptcp.add_addr_timeout, which is set to 2 minutes by default. Fixes: 30549eebc4d8 ("mptcp: make ADD_ADDR retransmission timeout adaptive") Signed-off-by: Matthieu Baerts (NGI0) --- v2: restore accidentally deleted icsk->icsk_rto > max check --- net/mptcp/pm.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c index 4ea896c83b38..89a9790e50bb 100644 --- a/net/mptcp/pm.c +++ b/net/mptcp/pm.c @@ -306,20 +306,27 @@ static unsigned int mptcp_adjust_add_addr_timeout(str= uct mptcp_sock *msk) const struct net *net =3D sock_net((struct sock *)msk); unsigned int rto =3D mptcp_get_add_addr_timeout(net); struct mptcp_subflow_context *subflow; - unsigned int max =3D 0; + unsigned int max =3D 0, max_stale =3D 0; =20 mptcp_for_each_subflow(msk, subflow) { struct sock *ssk =3D mptcp_subflow_tcp_sock(subflow); struct inet_connection_sock *icsk =3D inet_csk(ssk); =20 - if (icsk->icsk_rto > max) + if (!__mptcp_subflow_active(subflow)) + continue; + + if (unlikely(subflow->stale)) { + if (icsk->icsk_rto > max_stale) + max_stale =3D icsk->icsk_rto; + } else if (icsk->icsk_rto > max) { max =3D icsk->icsk_rto; + } } =20 - if (max && max < rto) - rto =3D max; + if (max) + return max < rto ? max : rto; =20 - return rto; + return max_stale && max_stale < rto ? max_stale : rto; } =20 static void mptcp_pm_add_timer(struct timer_list *timer) --=20 2.53.0