kernel/tools/testing/selftests/bpf/progs/test_static_linked1.c, branch linux-6.2.y

selftests/bpf: Validate skeleton gen handles skipped fields

2021-05-14T00:23:57Z

Adjust static_linked selftests to test a mix of global and static variables and their handling of bpftool's skeleton generation code. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210513233643.194711-1-andrii@kernel.org

selftests/bpf: Stop using static variables for passing data to/from user-space

2021-05-11T22:07:17Z

In preparation of skipping emitting static variables in BPF skeletons, switch all current selftests uses of static variables to pass data between BPF and user-space to use global variables. All non-read-only `static volatile` variables become just plain global variables by dropping `static volatile` part. Read-only `static volatile const` variables, though, still require `volatile` modifier, otherwise compiler will ignore whatever values are set from user-space. Few static linker tests are using name-conflicting static variables to validate that static linker still properly handles static variables and doesn't trip up on name conflicts. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210507054119.270888-4-andrii@kernel.org

selftests/bpf: Add multi-file statically linked BPF object file test

2021-03-18T23:14:23Z

Add Makefile infra to specify multi-file BPF object files (and derivative skeletons). Add first selftest validating BPF static linker can merge together successfully two independent BPF object files and resulting object and skeleton are correct and usable. Use the same F(F(F(X))) = F(F(X)) identity test on linked object files as for the case of single BPF object files. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210318194036.3521577-13-andrii@kernel.org