Re: [PATCH v2 bpf-next 1/3] bpftool: add ability to dump BTF types

On 4/24/19 10:03 PM, andrii.nakryiko@gmail.com wrote:

From: Andrii Nakryiko <redacted>

Add new `btf dump` sub-command to bpftool. It allows to dump
human-readable low-level BTF types representation of BTF types. BTF can
be retrieved from few different sources:
   - from BTF object by ID;
   - from PROG, if it has associated BTF;
   - from MAP, if it has associated BTF data; it's possible to narrow
     down types to either key type, value type, both, or all BTF types;
   - from ELF file (.BTF section).

Output format mostly follows BPF verifier log format with few notable
exceptions:
   - all the type/field/param/etc names are enclosed in single quotes to
     allow easier grepping and to stand out a little bit more;
   - FUNC_PROTO output follows STRUCT/UNION/ENUM format of having one
     line per each argument; this is more uniform and allows easy
     grepping, as opposed to succinct, but inconvenient format that BPF
     verifier log is using.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <redacted>
Cc: Yonghong Song <redacted>
Cc: Martin KaFai Lau <redacted>
Cc: Song Liu <redacted>
Cc: Arnaldo Carvalho de Melo <redacted>
Signed-off-by: Andrii Nakryiko <redacted>

Acked-by: Yonghong Song <redacted>