selftests/bpf: Add tests for array map with local percpu kptr

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Add non-sleepable and sleepable tests with percpu kptr. For
non-sleepable test, four programs are executed in the order of:
  1. allocate percpu data.
  2. assign values to percpu data.
  3. retrieve percpu data.
  4. de-allocate percpu data.

The sleepable prog tried to exercise all above 4 steps in a
single prog. Also for sleepable prog, rcu_read_lock is needed
to protect direct percpu ptr access (from map value) and
following bpf_this_cpu_ptr() and bpf_per_cpu_ptr() helpers.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230827152811.2000125-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Yonghong Song 2023-08-27 08:28:11 -07:00 • committed by Alexei Starovoitov

parent 968c76cb3d

commit 6adf82a439

2 changed files with 265 additions and 0 deletions

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78

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

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187

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

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