linux-kernel - Re: [PATCH bpf-next v3 05/12] bpf: sockmap: move generic sockmap hooks from BPF TCP

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Message-ID: <87blpbyocb.fsf@cloudflare.com>
Date:   Thu, 05 Mar 2020 13:32:04 +0100
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Lorenz Bauer <lmb@...udflare.com>
Cc:     john.fastabend@...il.com, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        kernel-team@...udflare.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 05/12] bpf: sockmap: move generic sockmap hooks from BPF TCP

On Wed, Mar 04, 2020 at 11:13 AM CET, Lorenz Bauer wrote:
> The init, close and unhash handlers from TCP sockmap are generic,
> and can be reused by UDP sockmap. Move the helpers into the sockmap code
> base and expose them. This requires tcp_bpf_get_proto and tcp_bpf_clone to
> be conditional on BPF_STREAM_PARSER.
>
> The moved functions are unmodified, except that sk_psock_unlink is
> renamed to sock_map_unlink to better match its behaviour.
>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---

To spell out the tcp_bpf_get_proto() and tcp_bpf_clone() dependency on
CONFIG_BPF_STREAM_PARSER - both of these functions access tcp_bpf_prots,
which now hold pointers to sock_map_{unhash,close}. And
sock_map_{unhash,close} get built when CONFIG_BPF_STREAM_PARSER is
enabled.

Reviewed-by: Jakub Sitnicki <jakub@...udflare.com>

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