[PATCH bpf-next v2 0/5] libbpf: rename btf__get_from_id() and btf__load() APIs, support split BTF

[Quentin Monnet <quentin@isovalent.com>]

As part of the effort to move towards a v1.0 for libbpf [0], this set
improves some confusing function names related to BTF loading from and to
the kernel:

- btf__load() becomes btf__load_into_kernel().
- btf__get_from_id becomes btf__load_from_kernel_by_id().
- A new version btf__load_from_kernel_by_id_split() extends the former to
  add support for split BTF.

The old functions are not removed or marked as deprecated yet, there
should be in a future libbpf version.

The last patch is a trivial change to bpftool to add support for dumping
split BTF objects by referencing them by their id (and not only by their
BTF path).

[0] https://github.com/libbpf/libbpf/wiki/Libbpf:-the-road-to-v1.0#btfh-apis

v2:
- Remove deprecation marking of legacy functions (patch 4/6 from v1).
- Make btf__load_from_kernel_by_id{,_split}() return the btf struct.
- Add new functions to v0.5.0 API (and not v0.6.0).

Quentin Monnet (5):
  libbpf: rename btf__load() as btf__load_into_kernel()
  libbpf: rename btf__get_from_id() as btf__load_from_kernel_by_id()
  tools: replace btf__get_from_id() with btf__load_from_kernel_by_id()
  libbpf: add split BTF support for btf__load_from_kernel_by_id()
  tools: bpftool: support dumping split BTF by id

 tools/bpf/bpftool/btf.c                      |  8 ++---
 tools/bpf/bpftool/btf_dumper.c               |  6 ++--
 tools/bpf/bpftool/map.c                      | 16 +++++-----
 tools/bpf/bpftool/prog.c                     | 29 +++++++++++------
 tools/lib/bpf/btf.c                          | 33 ++++++++++++++------
 tools/lib/bpf/btf.h                          |  4 +++
 tools/lib/bpf/libbpf.c                       |  7 +++--
 tools/lib/bpf/libbpf.map                     |  3 ++
 tools/perf/util/bpf-event.c                  | 11 ++++---
 tools/perf/util/bpf_counter.c                | 12 +++++--
 tools/testing/selftests/bpf/prog_tests/btf.c |  4 ++-
 11 files changed, 86 insertions(+), 47 deletions(-)

-- 
2.30.2