kernel/tools/testing/selftests/bpf/prog_tests/recursion.c, branch linux-6.2.y

selftest/bpf: Switch recursion test to use htab_map_delete_elem

2021-10-06T19:34:02Z

Currently the recursion test is hooking __htab_map_lookup_elem function, which is invoked both from bpf_prog and bpf syscall. But in our kernel build, the __htab_map_lookup_elem gets inlined within the htab_map_lookup_elem, so it's not trigered and the test fails. Fixing this by using htab_map_delete_elem, which is not inlined for bpf_prog calls (like htab_map_lookup_elem is) and is used directly as pointer for map_delete_elem, so it won't disappear by inlining. Signed-off-by: Jiri Olsa Signed-off-by: Andrii Nakryiko Acked-by: Song Liu Link: https://lore.kernel.org/bpf/YVnfFTL/3T6jOwHI@krava

selftests/bpf: Improve recursion selftest

2021-02-11T15:19:24Z

Since recursion_misses counter is available in bpf_prog_info improve the selftest to make sure it's counting correctly. Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20210210033634.62081-8-alexei.starovoitov@gmail.com

selftest/bpf: Add a recursion test

2021-02-11T15:19:16Z

Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com