[RFC PATCH bpf-next 0/2] bpf: bpf link iterator

[Dmitrii Dolgov <9erthalion6@gmail.com>]

Bpf links seem to be one of the important structures for which no
iterator is provided. Such iterator could be useful in those cases when
generic 'task/file' is not suitable or better performance is needed.

The implementation is mostly copied from prog iterator, and I would like
to get any high-level feedback about what needs to be different or have
to be taken into account. As a side note, I would also appreciate if
someone could point me out to some guide about writing selftests for bpf
subsystem -- for some unclear reason I couldn't compile the test from
this changeset, and was testing it only manually with a custom test
program.

Dmitrii Dolgov (2):
  bpf: Add bpf_link iterator
  selftests/bpf: Add bpf_link test

 include/linux/bpf.h                           |   1 +
 kernel/bpf/Makefile                           |   2 +-
 kernel/bpf/link_iter.c                        | 107 ++++++++++++++++++
 kernel/bpf/syscall.c                          |  19 ++++
 .../selftests/bpf/prog_tests/bpf_iter.c       |  15 +++
 .../selftests/bpf/progs/bpf_iter_bpf_link.c   |  18 +++
 6 files changed, 161 insertions(+), 1 deletion(-)
 create mode 100644 kernel/bpf/link_iter.c
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_bpf_link.c

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2.32.0