kernel/tools/testing/selftests/bpf/progs/map_kptr.c, branch linux-6.2.y

selftests/bpf: Fix map_kptr test.

2023-03-10T08:28:22Z

[ Upstream commit 62d101d5f422cde39b269f7eb4cbbe2f1e26f9d4 ] The compiler is optimizing out majority of unref_ptr read/writes, so the test wasn't testing much. For example, one could delete '__kptr' tag from 'struct prog_test_ref_kfunc __kptr *unref_ptr;' and the test would still "pass". Convert it to volatile stores. Confirmed by comparing bpf asm before/after. Fixes: 2cbc469a6fc3 ("selftests/bpf: Add C tests for kptr") Signed-off-by: Alexei Starovoitov Acked-by: Stanislav Fomichev Acked-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20230214235051.22938-1-alexei.starovoitov@gmail.com Signed-off-by: Martin KaFai Lau Signed-off-by: Sasha Levin

selftests/bpf: Add tests for kptr_ref refcounting

2022-05-11T23:57:27Z

Check at runtime how various operations for kptr_ref affect its refcount and verify against the actual count. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20220511194654.765705-5-memxor@gmail.com Signed-off-by: Alexei Starovoitov

selftests/bpf: Add C tests for kptr

2022-04-26T03:26:44Z

This uses the __kptr and __kptr_ref macros as well, and tries to test the stuff that is supposed to work, since we have negative tests in test_verifier suite. Also include some code to test map-in-map support, such that the inner_map_meta matches the kptr_off_tab of map added as element. Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220424214901.2743946-12-memxor@gmail.com