netdev - Re: [PATCH bpf-next 2/6] bpf: return EOPNOTSUPP when map lookup isn't supported

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Date:   Mon, 8 Oct 2018 23:58:00 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "David S . Miller" <davem@...emloft.net>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/6] bpf: return EOPNOTSUPP when map lookup isn't supported

On Mon, Oct 8, 2018 at 6:06 PM Prashant Bhole
<bhole_prashant_q7@....ntt.co.jp> wrote:
>
> Return ERR_PTR(-EOPNOTSUPP) from map_lookup_elem() methods of below
> map types:
> - BPF_MAP_TYPE_PROG_ARRAY
> - BPF_MAP_TYPE_STACK_TRACE
> - BPF_MAP_TYPE_XSKMAP
> - BPF_MAP_TYPE_SOCKMAP/BPF_MAP_TYPE_SOCKHASH
>
> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
> Acked-by: Alexei Starovoitov <ast@...nel.org>
Acked-by: Song Liu <songliubraving@...com>
> ---
>  kernel/bpf/arraymap.c | 2 +-
>  kernel/bpf/sockmap.c  | 2 +-
>  kernel/bpf/stackmap.c | 2 +-
>  kernel/bpf/xskmap.c   | 2 +-
>  4 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
> index dded84cbe814..24583da9ffd1 100644
> --- a/kernel/bpf/arraymap.c
> +++ b/kernel/bpf/arraymap.c
> @@ -449,7 +449,7 @@ static void fd_array_map_free(struct bpf_map *map)
>
>  static void *fd_array_map_lookup_elem(struct bpf_map *map, void *key)
>  {
> -       return NULL;
> +       return ERR_PTR(-EOPNOTSUPP);
>  }
>
>  /* only called from syscall */
> diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
> index d37a1a0a6e1e..5d0677d808ae 100644
> --- a/kernel/bpf/sockmap.c
> +++ b/kernel/bpf/sockmap.c
> @@ -2096,7 +2096,7 @@ int sockmap_get_from_fd(const union bpf_attr *attr, int type,
>
>  static void *sock_map_lookup(struct bpf_map *map, void *key)
>  {
> -       return NULL;
> +       return ERR_PTR(-EOPNOTSUPP);
>  }
>
>  static int sock_map_update_elem(struct bpf_map *map,
> diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
> index 8061a439ef18..b2ade10f7ec3 100644
> --- a/kernel/bpf/stackmap.c
> +++ b/kernel/bpf/stackmap.c
> @@ -505,7 +505,7 @@ const struct bpf_func_proto bpf_get_stack_proto = {
>  /* Called from eBPF program */
>  static void *stack_map_lookup_elem(struct bpf_map *map, void *key)
>  {
> -       return NULL;
> +       return ERR_PTR(-EOPNOTSUPP);
>  }
>
>  /* Called from syscall */
> diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c
> index 9f8463afda9c..ef0b7b6ef8a5 100644
> --- a/kernel/bpf/xskmap.c
> +++ b/kernel/bpf/xskmap.c
> @@ -154,7 +154,7 @@ void __xsk_map_flush(struct bpf_map *map)
>
>  static void *xsk_map_lookup_elem(struct bpf_map *map, void *key)
>  {
> -       return NULL;
> +       return ERR_PTR(-EOPNOTSUPP);
>  }
>
>  static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value,
> --
> 2.17.1
>
>