netdev - Re: [PATCH bpf-next v2 4/5] libbpf: add split BTF support for btf__load_from_kernel_by

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Date:   Thu, 22 Jul 2021 17:49:51 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Quentin Monnet <quentin@...valent.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH bpf-next v2 4/5] libbpf: add split BTF support for btf__load_from_kernel_by_id()

On Wed, Jul 21, 2021 at 8:38 AM Quentin Monnet <quentin@...valent.com> wrote:
>
> Add a new API function btf__load_from_kernel_by_id_split(), which takes
> a pointer to a base BTF object in order to support split BTF objects
> when retrieving BTF information from the kernel.
>
> Reference: https://github.com/libbpf/libbpf/issues/314
>
> Signed-off-by: Quentin Monnet <quentin@...valent.com>
> Acked-by: John Fastabend <john.fastabend@...il.com>
> ---
>  tools/lib/bpf/btf.c      | 9 +++++++--
>  tools/lib/bpf/btf.h      | 2 ++
>  tools/lib/bpf/libbpf.map | 1 +
>  3 files changed, 10 insertions(+), 2 deletions(-)
>

[...]

> diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
> index 3db9446bc133..c9407d57d096 100644
> --- a/tools/lib/bpf/btf.h
> +++ b/tools/lib/bpf/btf.h
> @@ -69,6 +69,8 @@ LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
>  LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset);
>  LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
>  LIBBPF_API struct btf *btf__load_from_kernel_by_id(__u32 id);
> +LIBBPF_API struct btf *btf__load_from_kernel_by_id_split(__u32 id,
> +                                                        struct btf *base_btf);

nit: please keep it on a single line, it's not that long

>  LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
>                                     __u32 expected_key_size,
>                                     __u32 expected_value_size,
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index ca8cc7a7faad..eecf77227aeb 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -374,6 +374,7 @@ LIBBPF_0.5.0 {
>                 bpf_map_lookup_and_delete_elem_flags;
>                 bpf_object__gen_loader;
>                 btf__load_from_kernel_by_id;
> +               btf__load_from_kernel_by_id_split;
>                 btf__load_into_kernel;
>                 btf_dump__dump_type_data;
>                 libbpf_set_strict_mode;
> --
> 2.30.2
>