netdev - Re: [PATCH bpf-next v2 3/5] bpf: add 'bpf_mptcp

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Date:   Mon, 14 Sep 2020 14:00:47 -0700
From:   Song Liu <song@...nel.org>
To:     Nicolas Rybowski <nicolas.rybowski@...sares.net>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        mptcp@...ts.01.org
Subject: Re: [PATCH bpf-next v2 3/5] bpf: add 'bpf_mptcp_sock' structure and helper

On Fri, Sep 11, 2020 at 8:15 AM Nicolas Rybowski
<nicolas.rybowski@...sares.net> wrote:
>
> In order to precisely identify the parent MPTCP connection of a subflow,
> it is required to access the mptcp_sock's token which uniquely identify a
> MPTCP connection.
>
> This patch adds a new structure 'bpf_mptcp_sock' exposing the 'token' field
> of the 'mptcp_sock' extracted from a subflow's 'tcp_sock'. It also adds the
> declaration of a new BPF helper of the same name to expose the newly
> defined structure in the userspace BPF API.
>
> This is the foundation to expose more MPTCP-specific fields through BPF.
>
> Currently, it is limited to the field 'token' of the msk but it is
> easily extensible.
>
> Acked-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> Acked-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> Signed-off-by: Nicolas Rybowski <nicolas.rybowski@...sares.net>

Acked-by: Song Liu <songliubraving@...com>