[PATCHv4 bpf-next 0/3] bpf: tracing_multi link info support

[Jiri Olsa <jolsa@kernel.org>]

hi,
adding link info support for tracing_multi link.

Adding the kernel support with related selftests and bpftool support
to display the tracing_multi link info, the output looks like:

  # bpftool link
  ...
  61: tracing_multi  prog 167
          attach_type trace_fentry_multi  btf_obj_id 1  count 3
          btf_id           addr             cookie           func [module]
          92598            ffffffff825017c4 10               bpf_fentry_test1
          92600            ffffffff82503814 30               bpf_fentry_test2
          92601            ffffffff82503824 20               bpf_fentry_test3
          pids test_progs(1540)

thanks,
jirka


v1: https://lore.kernel.org/bpf/20260621204524.61067-1-jolsa@kernel.org/
v2: https://lore.kernel.org/bpf/20260623142417.275892-1-jolsa@kernel.org/
v3: https://lore.kernel.org/bpf/20260629143844.862369-1-jolsa@kernel.org/

v4 changes:
- fix wrong allocation check [Alexei]

v3 changes:
- added acks [Andrii, Leon]
- display cookies as decimal numbers [Andrii]
- renamed obj_id to btf_obj_id [Andrii]
- several fixes in bpftool change [Andrii]

v2 changes:
- fix kernel symbol search logic [sashiko]
- typo fixes [bots]


---
Jiri Olsa (3):
      bpf: Add tracing_multi link info support
      selftests/bpf: Add tracing_multi link info tests
      bpftool: Add tracing_multi link info output

 include/uapi/linux/bpf.h                                |   9 +++
 kernel/trace/bpf_trace.c                                |  55 +++++++++++++++++
 tools/bpf/bpftool/link.c                                | 133 ++++++++++++++++++++++++++++++++++++++++
 tools/include/uapi/linux/bpf.h                          |   9 +++
 tools/testing/selftests/bpf/prog_tests/fill_link_info.c | 242 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/test_fill_link_info.c |   6 ++
 6 files changed, 454 insertions(+)