From mboxrd@z Thu Jan 1 00:00:00 1970 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 2E4F7306D2A for ; Wed, 22 Apr 2026 08:32:38 +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=1776846758; cv=none; b=MGNVBExEnpA1cEzjrvvSW3vCSEa48AQfCfeQfXC+0wO/P2Uf+J5s3aciFHikfilcSMuWGw3Fwu/2HVktaaHRDglSsF08ju//S0+TOzXBE5Nmh4Nn1pVNSdOQkllosM/M+NiAqdcmbLdmbCSz9m24CjODGMqIHR5tzTHWu2mPAx8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776846758; c=relaxed/simple; bh=eZNEuoARZGfbua23XABSA2qZe8PALF3VGkiSVUxPJkY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=SpvCRl3W/tLllA+xzD+PFaMpw3TIxw/TUEVuJv3L80XdP1xD7NUg/Zr2jDGhmugkZYwlf57Bg7qqMXxvUV/AAU+kb7vwYd3qIp7gS81/hf7oaWodFmGpib50rk3hYAz97Y0/v96HfBzMmML2eAWQpGSfjAdNzrFcXS0aFf3714I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iboG37/3; 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="iboG37/3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C3C0C19425; Wed, 22 Apr 2026 08:32:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776846757; bh=eZNEuoARZGfbua23XABSA2qZe8PALF3VGkiSVUxPJkY=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=iboG37/3V1516NxZCX9g9V0+yUT0sccU+TPFrQYrAqQOnwS/UNhwjfceu0nP5jKjR MWv5GzL9TKWE7IF6AItSvMVDzCtVFoWO0k5EHk7HxiHXLUxrZtJKBlVvpjA7RKw+ny Jh6NO5fzId4UIPZlLikW+CRylI12ezr195oVjMmiSgBZOSqo2QBdCTAx3yLUjhLARu BtYzZPYo/5w3i50MkVBL7zUuNYrNCystqDk3Yu4AkXU5OCe1M3uvH39Rv+cgQu3lmG ma/rzRIhd3ZVGHf/WbUUt1h37EpMWey9L5oG4JWl8uLKlsivJLI2m2Zkr+40L5JS06 30TWG0uYgQkKw== Message-ID: <88df3189-4aa0-41fa-9a58-0d17fb736c87@kernel.org> Date: Wed, 22 Apr 2026 10:32:33 +0200 Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH mptcp-next v3 1/3] mptcp: propagate RECVERR sockopts to subflows Content-Language: fr To: Paolo Abeni , David Carlier , mptcp@lists.linux.dev Cc: Mat Martineau , Geliang Tang References: <20260421223338.52743-1-devnexen@gmail.com> <20260421223338.52743-2-devnexen@gmail.com> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Paolo, Thank you for the review! On 22/04/2026 10:05, Paolo Abeni wrote: > On 4/22/26 12:33 AM, David Carlier wrote: >> Propagate IP_RECVERR/IP_RECVERR_RFC4884 and >> IPV6_RECVERR/IPV6_RECVERR_RFC4884 from the MPTCP socket to >> existing and future subflows. >> >> Apply the matching sockopt according to the subflow family so mixed- >> family subflows stay aligned with the parent socket configuration, >> including disable-time errqueue purge semantics. (...) >> +static int mptcp_setsockopt_v6_recverr(struct mptcp_sock *msk, int optname, >> + sockptr_t optval, unsigned int optlen) >> +{ >> + struct mptcp_subflow_context *subflow; >> + struct sock *sk = (struct sock *)msk; >> + int ret; >> + >> + ret = ipv6_setsockopt(sk, SOL_IPV6, optname, optval, optlen); >> + if (ret) >> + return ret; >> + >> + lock_sock(sk); >> + sockopt_seq_inc(msk); >> + mptcp_for_each_subflow(msk, subflow) { >> + struct sock *ssk = mptcp_subflow_tcp_sock(subflow); >> + bool rfc4884 = optname == IPV6_RECVERR_RFC4884; >> + >> + ret = mptcp_subflow_set_recverr(sk, ssk, rfc4884); > > The above looks a bit overcomplicated?!? It looks like you could > leverage mptcp_setsockopt_all_sf() in and drop the > mptcp_subflow_set_recverr() and mptcp_recverr_enabled() helpers. > > @Mattbe: it's not clear to me why mptcp_setsockopt_all_sf() does not > call sockopt_seq_inc(msk) or sync the setsockopt_seq, possibly an > unrelated bug? Oh yes, good catch! And a lock of the sk (msk) before iterating the subflows, no? Same in __mptcp_setsockopt_set_val()? Cheers, Matt -- Sponsored by the NGI0 Core fund.