bpf: selftests: Add selftests for module kfunc support

2021-10-06T00:07:42Z

This adds selftests that tests the success and failure path for modules kfuncs (in presence of invalid kfunc calls) for both libbpf and gen_loader. It also adds a prog_test kfunc_btf_id_list so that we can add module BTF ID set from bpf_testmod. This also introduces a couple of test cases to verifier selftests for validating whether we get an error or not depending on if invalid kfunc call remains after elimination of unreachable instructions. Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20211002011757.311265-10-memxor@gmail.com

selftests/bpf: Test kernel module ksym externs

2021-01-13T01:24:30Z

Add per-CPU variable to bpf_testmod.ko and use those from new selftest to validate it works end-to-end. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Acked-by: Hao Luo Link: https://lore.kernel.org/bpf/20210112075520.4103414-8-andrii@kernel.org

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

bpf: selftests: Add selftests for module kfunc support

selftests/bpf: Test kernel module ksym externs