selftests/bpf: Test multi_st_ops and calling kfuncs from different programs

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Test multi_st_ops and demonstrate how different bpf programs can call
a kfuncs that refers to the struct_ops instance in the same source file
by id. The id is defined as a global vairable and initialized before
attaching the skeleton. Kfuncs that take the id can hide the argument
with a macro to make it almost transparent to bpf program developers.

The test involves two struct_ops returning different values from
.test_1. In syscall and tracing programs, check if the correct value is
returned by a kfunc that calls .test_1.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250806162540.681679-4-ameryhung@gmail.com

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Amery Hung 2025-08-06 09:25:40 -07:00 • committed by Martin KaFai Lau

parent eeb52b6279

commit ba7000f1c3

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74

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

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tools/testing/selftests/bpf/progs/struct_ops_id_ops_mapping1.c

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tools/testing/selftests/bpf/progs/struct_ops_id_ops_mapping2.c

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