netdev - Re: [PATCH bpf-next 14/17] libbpf: Add support for SK

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Message-ID: <CAEf4BzaE=+0ZkwqetjDHg4MnE1WDQDKFHqEkM825h6YMCZAdNA@mail.gmail.com>
Date:   Fri, 8 May 2020 10:41:46 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>, Yonghong Song <yhs@...com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        dccp@...r.kernel.org, kernel-team@...udflare.com,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Gerrit Renker <gerrit@....abdn.ac.uk>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH bpf-next 14/17] libbpf: Add support for SK_LOOKUP program type

On Wed, May 6, 2020 at 5:58 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> Make libbpf aware of the newly added program type, and assign it a
> section name.
>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
>  tools/lib/bpf/libbpf.c        | 3 +++
>  tools/lib/bpf/libbpf.h        | 2 ++
>  tools/lib/bpf/libbpf.map      | 2 ++
>  tools/lib/bpf/libbpf_probes.c | 1 +
>  4 files changed, 8 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 977add1b73e2..74f4a15dc19e 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -6524,6 +6524,7 @@ BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT);
>  BPF_PROG_TYPE_FNS(tracing, BPF_PROG_TYPE_TRACING);
>  BPF_PROG_TYPE_FNS(struct_ops, BPF_PROG_TYPE_STRUCT_OPS);
>  BPF_PROG_TYPE_FNS(extension, BPF_PROG_TYPE_EXT);
> +BPF_PROG_TYPE_FNS(sk_lookup, BPF_PROG_TYPE_SK_LOOKUP);
>
>  enum bpf_attach_type
>  bpf_program__get_expected_attach_type(struct bpf_program *prog)
> @@ -6684,6 +6685,8 @@ static const struct bpf_sec_def section_defs[] = {
>         BPF_EAPROG_SEC("cgroup/setsockopt",     BPF_PROG_TYPE_CGROUP_SOCKOPT,
>                                                 BPF_CGROUP_SETSOCKOPT),
>         BPF_PROG_SEC("struct_ops",              BPF_PROG_TYPE_STRUCT_OPS),
> +       BPF_EAPROG_SEC("sk_lookup",             BPF_PROG_TYPE_SK_LOOKUP,
> +                                               BPF_SK_LOOKUP),
>  };
>
>  #undef BPF_PROG_SEC_IMPL
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index f1dacecb1619..8373fbacbba3 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -337,6 +337,7 @@ LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
>  LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog);
>  LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog);
>  LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog);
> +LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog);
>
>  LIBBPF_API enum bpf_prog_type bpf_program__get_type(struct bpf_program *prog);
>  LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
> @@ -364,6 +365,7 @@ LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
>  LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog);
>  LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog);
>  LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog);
> +LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog);

cc Yonghong, bpf_iter programs should probably have similar
is_xxx/set_xxx functions?..

>
>  /*
>   * No need for __attribute__((packed)), all members of 'bpf_map_def'
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index e03bd4db827e..113ac0a669c2 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -253,6 +253,8 @@ LIBBPF_0.0.8 {
>                 bpf_program__set_attach_target;
>                 bpf_program__set_lsm;
>                 bpf_set_link_xdp_fd_opts;
> +               bpf_program__is_sk_lookup;
> +               bpf_program__set_sk_lookup;
>  } LIBBPF_0.0.7;
>

0.0.8 is sealed, please add them into 0.0.9 map below

>  LIBBPF_0.0.9 {
> diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
> index 2c92059c0c90..5c6d3e49f254 100644
> --- a/tools/lib/bpf/libbpf_probes.c
> +++ b/tools/lib/bpf/libbpf_probes.c
> @@ -109,6 +109,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
>         case BPF_PROG_TYPE_STRUCT_OPS:
>         case BPF_PROG_TYPE_EXT:
>         case BPF_PROG_TYPE_LSM:
> +       case BPF_PROG_TYPE_SK_LOOKUP:
>         default:
>                 break;
>         }
> --
> 2.25.3
>