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[bpf-next,v3,0/2] libbpf: introduce line_info and func_info getters

Message ID 20250401165417.170632-1-mykyta.yatsenko5@gmail.com (mailing list archive)
Headers show
Series libbpf: introduce line_info and func_info getters | expand

Message

Mykyta Yatsenko April 1, 2025, 4:54 p.m. UTC 
From: Mykyta Yatsenko <yatsenko@meta.com>

This patchset introduces new libbpf API getters that enable the retrieval
of .BTF.ext line and func info.
This change enables users to load bpf_program directly using bpf_prog_load,
bypassing the higher-level bpf_object__load API. Providing line and
function info is essential for BPF program verification in some cases.

v2 -> v3
 * Return ENOTSUPP if func or line info struct size differs from the one in
 uapi linux headers.
 * Add selftests.
 
v1 -> v2
 Move bpf_line_info_min and bpf_func_info_min from libbpf_internal.h to
 btf.h. Did not remove _min suffix, because there already are bpf_line_info
 and bpf_func_info structs in uapi/../bpf.h.

Mykyta Yatsenko (2):
  libbpf: add getters for BTF.ext func and line info
  selftests/bpf: add BTF.ext line/func info getter tests

 tools/lib/bpf/libbpf.c                        |  24 ++++
 tools/lib/bpf/libbpf.h                        |   6 +
 tools/lib/bpf/libbpf.map                      |   4 +
 .../selftests/bpf/prog_tests/test_btf_ext.c   | 111 ++++++++++++++++++
 .../selftests/bpf/progs/test_btf_ext.c        |  21 ++++
 5 files changed, 166 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/test_btf_ext.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_btf_ext.c