[PATCH v2 bpf 0/3] Introduce BPF_ANNOTATE_KV_PAIR

[Martin KaFai Lau <kafai@fb.com>]

The series allows the BPF loader to figure out
the btf_key_id and btf_value_id from a map's name
by using BPF_ANNOTATE_KV_PAIR.  It also removes
the old 'typedef' way which requires two separate
typedefs (one for the key and one for the value).

By doing this, iproute2 and libbpf have one
consistent way to figure out the btf_key_type_id and
btf_value_type_id for a map.

The first two patches are some prep/cleanup works.
The last patch introduces BPF_ANNOTATE_KV_PAIR.

v2:
- Fix the incorrect '&&' check on container_type
  in bpf_map_find_btf_info().
- Expose the existing static btf_type_by_id() instead of
  creating a new one.

Martin KaFai Lau (3):
  bpf: btf: Sync uapi btf.h to tools
  bpf: Replace [u]int32_t and [u]int64_t in libbpf
  bpf: Introduce BPF_ANNOTATE_KV_PAIR

 tools/include/uapi/linux/btf.h               |  2 +-
 tools/lib/bpf/btf.c                          | 33 ++++----
 tools/lib/bpf/btf.h                          | 10 ++-
 tools/lib/bpf/libbpf.c                       | 85 +++++++++++---------
 tools/lib/bpf/libbpf.h                       |  4 +-
 tools/testing/selftests/bpf/bpf_helpers.h    |  9 +++
 tools/testing/selftests/bpf/test_btf_haskv.c |  7 +-
 7 files changed, 80 insertions(+), 70 deletions(-)

-- 
2.17.1