linux.git/tools/testing/selftests/bpf/testing_helpers.h, branch for-next

selftests/bpf: Provide a generic [un]load_module helper

2024-10-10T17:44:03+00:00

Generalize the previous [un]load_bpf_testmod() helpers (in
testing_helpers.c) to the more generic [un]load_module(), which can
load an arbitrary kernel module by name. This allows future selftests
to more easily load custom kernel modules other than bpf_testmod.ko.
Refactor [un]load_bpf_testmod() to wrap this new helper.

Signed-off-by: Simon Sundberg 
Acked-by: Jiri Olsa 
Acked-by: Kumar Kartikeya Dwivedi 
Signed-off-by: Toke Høiland-Jørgensen 
Link: https://lore.kernel.org/r/20241010-fix-kfunc-btf-caching-for-modules-v2-2-745af6c1af98@redhat.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Test case for lacking CFI stub functions.

2024-02-22T20:26:41+00:00

Ensure struct_ops rejects the registration of struct_ops types without
proper CFI stub functions.

bpf_test_no_cfi.ko is a module that attempts to register a struct_ops type
called "bpf_test_no_cfi_ops" with cfi_stubs of NULL and non-NULL value.
The NULL one should fail, and the non-NULL one should succeed. The module
can only be loaded successfully if these registrations yield the expected
results.

Signed-off-by: Kui-Feng Lee 
Link: https://lore.kernel.org/r/20240222021105.1180475-3-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau

selftests/bpf: Move is_jit_enabled() into testing_helpers

2024-01-24T04:26:17+00:00

Currently, is_jit_enabled() is only used in test_progs, move it into
testing_helpers so that it can be used in test_verifier. While at it,
remove the second argument "0" of open() as Hou Tao suggested.

Signed-off-by: Tiezhu Yang 
Signed-off-by: Andrii Nakryiko 
Acked-by: Hou Tao 
Acked-by: Song Liu 
Link: https://lore.kernel.org/bpf/20240123090351.2207-2-yangtiezhu@loongson.cn

selftests/bpf: detect testing prog flags support

2024-01-23T22:40:22+00:00

Various tests specify extra testing prog_flags when loading BPF
programs, like BPF_F_TEST_RND_HI32, and more recently also
BPF_F_TEST_REG_INVARIANTS. While BPF_F_TEST_RND_HI32 is old enough to
not cause much problem on older kernels, BPF_F_TEST_REG_INVARIANTS is
very fresh and unconditionally specifying it causes selftests to fail on
even slightly outdated kernels.

This breaks libbpf CI test against 4.9 and 5.15 kernels, it can break
some local development (done outside of VM), etc.

To prevent this, and guard against similar problems in the future, do
runtime detection of supported "testing flags", and only provide those
that host kernel recognizes.

Acked-by: Song Liu 
Acked-by: Jiri Olsa 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20240109231738.575844-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Factor out get_xlated_program() helper

2024-01-23T22:40:21+00:00

Both test_verifier and test_progs use get_xlated_program(), so moving
the helper into testing_helpers.h to reuse it.

Acked-by: Eduard Zingerman 
Signed-off-by: Hou Tao 
Link: https://lore.kernel.org/r/20240105104819.3916743-3-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Check VLAN tag and proto in xdp_metadata

2023-12-14T00:16:41+00:00

Verify, whether VLAN tag and proto are set correctly.

To simulate "stripped" VLAN tag on veth, send test packet from VLAN
interface.

Also, add TO_STR() macro for convenience.

Acked-by: Stanislav Fomichev 
Signed-off-by: Larysa Zaremba 
Link: https://lore.kernel.org/r/20231205210847.28460-19-larysa.zaremba@intel.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Move get_time_ns to testing_helpers.h

2023-08-21T22:51:26+00:00

We'd like to have single copy of get_time_ns used b bench and test_progs,
but we can't just include bench.h, because of conflicting 'struct env'
objects.

Moving get_time_ns to testing_helpers.h which is being included by both
bench and test_progs objects.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20230809083440.3209381-19-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Use un/load_bpf_testmod functions in tests

2023-05-17T05:09:23+00:00

Now that we have un/load_bpf_testmod helpers in testing_helpers.h,
we can use it in other tests and save some lines.

Acked-by: David Vernet 
Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20230515133756.1658301-7-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Move test_progs helpers to testing_helpers object

2023-05-17T05:09:23+00:00

Moving test_progs helpers to testing_helpers object so they can be
used from test_verifier in following changes.

Also adding missing ifndef header guard to testing_helpers.h header.

Using stderr instead of env.stderr because un/load_bpf_testmod helpers
will be used outside test_progs. Also at the point of calling them
in test_progs the std files are not hijacked yet and stderr is the
same as env.stderr.

Acked-by: David Vernet 
Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20230515133756.1658301-4-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Test_progs can read test lists from file

2023-05-01T22:30:02+00:00

Improve test selection logic when using -a/-b/-d/-t options.
The list of tests to include or exclude can now be read from a file,
specified as @.

The file contains one name (or wildcard pattern) per line, and
comments beginning with # are ignored.

These options can be passed multiple times to read more than one file.

Signed-off-by: Stephen Veiss 
Signed-off-by: Andrii Nakryiko 
Acked-by: Yonghong Song 
Link: https://lore.kernel.org/bpf/20230427225333.3506052-3-sveiss@meta.com