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 8E27F3BFE2E for ; Wed, 22 Apr 2026 08:35:10 +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=1776846910; cv=none; b=ZXzgjeRTtzcX9o/XtEioEK4YB6X2nVLPmLyOshFan+HCPfegyXMj3tDMlMiSwTI94tw1uO4bIKoukXwLSOm0T4+ceXnL8d7yFJJZI5NMeVmMAZRciRDxXWByeByJSJfII9eMPFSAwn0ArXMiZ7EDPm5KavaCoyn9mr2JaMt91l8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776846910; c=relaxed/simple; bh=BuRwxCjmx49u4gV15o8v7wHvBoEQHr/LBIKLiM+l1aA=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=g/4cXQimg0e9AFUfM5n4OhXocFnvWaYq/dAaIzAqr8FvNey0/m3xXHqrUkCKWO7jcAVKtMeaLNbVAe0CXpzey+J0BnMjgxZuM0STz23NiC4QNYj++Fj+gBj0cVJxvbdI/USrAq6NjdmDI19KVCtpt/eufXp6Yj8blLHdXDV7gQI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RcUy0x1Y; 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="RcUy0x1Y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1311C19425; Wed, 22 Apr 2026 08:35:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776846910; bh=BuRwxCjmx49u4gV15o8v7wHvBoEQHr/LBIKLiM+l1aA=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=RcUy0x1YJT6B/VOXY4UNIf7sql5c1Jq7aR8r58EjdWOi2GzfT86xNho/ELw/8x4a/ LO4QQ1205d6nZjTWeb3oSif9fnqU4kgsSWVi+cyYqzz9EqZOSUUBK2u+xk5X/1Ltpt UcrsaqU+PByMhD+IvCFqhL0q2vMgkuC9UFVpd34MOCO5fjdJfJiYL6p/XVc19hKfqe ILOFufI9WKBHjm/eNrP/VjAK91EuZbCAVXa60TVRKQfo2PeLpHdCyoBygbalFlbUtS ump/nTjY1EC20c2qTOsgPTRcWq3fpa9i7aNA3yOmKRC7SFOg68kESov3re0sZtAdOn XwsdCmgAmVRkQ== Message-ID: Date: Wed, 22 Apr 2026 10:35:06 +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 From: Matthieu Baerts To: Paolo Abeni Cc: Mat Martineau , Geliang Tang , David Carlier , mptcp@lists.linux.dev References: <20260421223338.52743-1-devnexen@gmail.com> <20260421223338.52743-2-devnexen@gmail.com> <88df3189-4aa0-41fa-9a58-0d17fb736c87@kernel.org> Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 22/04/2026 10:32, Matthieu Baerts wrote: > 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()? (Not the same in __mptcp_setsockopt_set_val(): the sk is already locked) Cheers, Matt -- Sponsored by the NGI0 Core fund.