[PATCH bpf-next 0/3] Support passing BPF iterator to kfuncs

[Andrii Nakryiko <andrii@kernel.org>]

Add support for passing BPF iterator state to any kfunc. Such kfunc has to
declare such argument with valid `struct bpf_iter_<type> *` type and should
use "__iter" suffix in argument name, following the established suffix-based
convention. We add a simple test/demo iterator getter in bpf_testmod.

Andrii Nakryiko (3):
  bpf: extract iterator argument type and name validation logic
  bpf: allow passing struct bpf_iter_<type> as kfunc arguments
  selftests/bpf: test passing iterator to a kfunc

 include/linux/btf.h                           |  5 ++
 kernel/bpf/btf.c                              | 50 +++++++++++++------
 kernel/bpf/verifier.c                         | 35 +++++++++----
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   | 16 ++++--
 .../selftests/bpf/progs/iters_testmod_seq.c   | 50 +++++++++++++++++++
 5 files changed, 127 insertions(+), 29 deletions(-)

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2.43.5