selftests/bpf: implement and test custom testmod_seq iterator

Browse source

Implement a trivial iterator returning same specified integer value
N times as part of bpf_testmod kernel module. Add selftests to validate
everything works end to end.

We also reuse these tests as "verification-only" tests to validate that
kernel prints the state of custom kernel module-defined iterator correctly:

  fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)

"testmod_seq" part is an iterator type, and is coming from module's BTF
data dynamically at runtime.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230308184121.1165081-9-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Andrii Nakryiko 2023-03-08 10:41:21 -08:00 • committed by Alexei Starovoitov

parent f59b146092

commit 7e86a8c4ac

5 changed files with 169 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

tools/testing/selftests/bpf/DENYLIST.s390x

View file

42

tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c

View file

6

tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h

View file

42

tools/testing/selftests/bpf/prog_tests/iters.c

View file

79

tools/testing/selftests/bpf/progs/iters_testmod_seq.c

View file