netdev - Re: [PATCH bpf-next 2/7] bpf: sockmap: move generic sockmap hooks from BPF TCP

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Date:   Tue, 25 Feb 2020 09:22:10 -0800
From:   Song Liu <song@...nel.org>
To:     Lorenz Bauer <lmb@...udflare.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        kernel-team@...udflare.com
Subject: Re: [PATCH bpf-next 2/7] bpf: sockmap: move generic sockmap hooks
 from BPF TCP

On Tue, Feb 25, 2020 at 5:57 AM Lorenz Bauer <lmb@...udflare.com> wrote:
>
> The close, unhash and clone handlers from TCP sockmap are actually generic,
> and can be reused by UDP sockmap. Move the helpers into the sockmap code base
> and expose them.
>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---
>  include/linux/bpf.h   |  4 ++-
>  include/linux/skmsg.h | 28 ----------------
>  net/core/sock_map.c   | 77 +++++++++++++++++++++++++++++++++++++++++--
>  net/ipv4/tcp_bpf.c    | 55 ++-----------------------------
>  4 files changed, 79 insertions(+), 85 deletions(-)
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index 49b1a70e12c8..8422ab6a63d8 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -1355,6 +1355,8 @@ static inline void bpf_map_offload_map_free(struct bpf_map *map)
>  #if defined(CONFIG_BPF_STREAM_PARSER)
>  int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
>  int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
> +void sock_map_unhash(struct sock *sk);
> +void sock_map_close(struct sock *sk, long timeout);

I think we still need dummy version of these two functions in the #else
cause?