selftests/bpf: Add tests for BPF function stack arguments

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Add selftests covering stack argument passing for both BPF-to-BPF
subprog calls and kfunc calls with more than 5 arguments. All tests
are guarded by __BPF_FEATURE_STACK_ARGUMENT and __TARGET_ARCH_x86.

BPF-to-BPF subprog call tests (stack_arg.c):
  - Scalar stack args
  - Pointer stack args
  - Mixed pointer/scalar stack args
  - Nested calls
  - Dynptr stack arg
  - Two callees with different stack arg counts
  - Async callback

Kfunc call tests (stack_arg_kfunc.c, with bpf_testmod kfuncs):
  - Scalar stack args
  - Pointer stack args
  - Mixed pointer/scalar stack args
  - Dynptr stack arg
  - Memory buffer + size pair
  - Iterator
  - Const string pointer
  - Timer pointer

Acked-by: Puranjay Mohan <puranjay@kernel.org>
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260513045127.2397187-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Yonghong Song 2026-05-12 21:51:27 -07:00 • committed by Alexei Starovoitov

parent 324c3ca6ee

commit 79e7ec0063

5 changed files with 638 additions and 1 deletions

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139

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

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252

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

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163

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

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65

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

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20

tools/testing/selftests/bpf/test_kmods/bpf_testmod_kfunc.h

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