netdev - Re: [PATCH bpf-next v2 1/4] libbpf: Implement btf__save

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Message-ID: <CAEf4BzZOu4frtBqzqYO0dkmw+bXuhr91qQ7o5Lyrv_44eniN9g@mail.gmail.com>
Date:   Tue, 16 Nov 2021 21:25:23 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Mauricio Vásquez <mauricio@...volk.io>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Rafael David Tinoco <rafaeldtinoco@...il.com>,
        Lorenzo Fontana <lorenzo.fontana@...stic.co>,
        Leonardo Di Donato <leonardo.didonato@...stic.co>
Subject: Re: [PATCH bpf-next v2 1/4] libbpf: Implement btf__save_raw()

On Tue, Nov 16, 2021 at 8:42 AM Mauricio Vásquez <mauricio@...volk.io> wrote:
>
> Implement helper function to save the contents of a BTF object to a
> file.
>
> Signed-off-by: Mauricio Vásquez <mauricio@...volk.io>
> Signed-off-by: Rafael David Tinoco <rafael.tinoco@...asec.com>
> Signed-off-by: Lorenzo Fontana <lorenzo.fontana@...stic.co>
> Signed-off-by: Leonardo Di Donato <leonardo.didonato@...stic.co>
> ---
>  tools/lib/bpf/btf.c      | 30 ++++++++++++++++++++++++++++++
>  tools/lib/bpf/btf.h      |  2 ++
>  tools/lib/bpf/libbpf.map |  1 +
>  3 files changed, 33 insertions(+)
>
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index fadf089ae8fe..96a242f91832 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@ -1121,6 +1121,36 @@ struct btf *btf__parse_split(const char *path, struct btf *base_btf)
>         return libbpf_ptr(btf_parse(path, base_btf, NULL));
>  }
>
> +int btf__save_raw(const struct btf *btf, const char *path)
> +{
> +       const void *data;
> +       FILE *f = NULL;
> +       __u32 data_sz;
> +       int err = 0;
> +
> +       data = btf__raw_data(btf, &data_sz);
> +       if (!data) {
> +               err = -ENOMEM;
> +               goto out;
> +       }
> +
> +       f = fopen(path, "wb");
> +       if (!f) {
> +               err = -errno;
> +               goto out;
> +       }
> +
> +       if (fwrite(data, 1, data_sz, f) != data_sz) {
> +               err = -errno;
> +               goto out;
> +       }
> +
> +out:
> +       if (f)
> +               fclose(f);
> +       return libbpf_err(err);
> +}
> +
>  static void *btf_get_raw_data(const struct btf *btf, __u32 *size, bool swap_endian);
>
>  int btf__load_into_kernel(struct btf *btf)
> diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
> index 5c73a5b0a044..4f8d3f303aa6 100644
> --- a/tools/lib/bpf/btf.h
> +++ b/tools/lib/bpf/btf.h
> @@ -114,6 +114,8 @@ LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_b
>  LIBBPF_API struct btf *btf__parse_raw(const char *path);
>  LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf);
>
> +LIBBPF_API int btf__save_raw(const struct btf *btf, const char *path);
> +
>  LIBBPF_API struct btf *btf__load_vmlinux_btf(void);
>  LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf);
>  LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 6a59514a48cf..c9555f8655af 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -414,4 +414,5 @@ LIBBPF_0.6.0 {
>                 perf_buffer__new_deprecated;
>                 perf_buffer__new_raw;
>                 perf_buffer__new_raw_deprecated;
> +               btf__save_raw;

this is a sorted list, please keep it so

>  } LIBBPF_0.5.0;
> --
> 2.25.1
>