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selftests/bpf: Add a dedup selftest with equivalent structure types 

Without previous libbpf patch, the following error will occur:

  $ ./test_progs -t btf
  ...
  do_test_dedup:FAIL:check btf_dedup failed errno:-22#13/205 btf/dedup: btf_type_tag #5, struct:FAIL

And the previous libbpf patch fixed the issue.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211115163943.3922547-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2021-11-15 08:39:43 -08:00 committed by Daniel Borkmann
parent 69a055d546
commit 4746158305
1 changed files with 26 additions and 0 deletions
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26
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -7352,6 +7352,32 @@ static struct btf_dedup_test dedup_tests[] = {
BTF_STR_SEC("\0tag1"),
},
},
{
.descr = "dedup: btf_type_tag #5, struct",
.input = {
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_TYPE_TAG_ENC(NAME_NTH(1), 1), /* [2] */
BTF_TYPE_ENC(NAME_NTH(2), BTF_INFO_ENC(BTF_KIND_STRUCT, 1, 1), 4), /* [3] */
BTF_MEMBER_ENC(NAME_NTH(3), 2, BTF_MEMBER_OFFSET(0, 0)),
BTF_TYPE_TAG_ENC(NAME_NTH(1), 1), /* [4] */
BTF_TYPE_ENC(NAME_NTH(2), BTF_INFO_ENC(BTF_KIND_STRUCT, 1, 1), 4), /* [5] */
BTF_MEMBER_ENC(NAME_NTH(3), 4, BTF_MEMBER_OFFSET(0, 0)),
BTF_END_RAW,
},
BTF_STR_SEC("\0tag1\0t\0m"),
},
.expect = {
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_TYPE_TAG_ENC(NAME_NTH(1), 1), /* [2] */
BTF_TYPE_ENC(NAME_NTH(2), BTF_INFO_ENC(BTF_KIND_STRUCT, 1, 1), 4), /* [3] */
BTF_MEMBER_ENC(NAME_NTH(3), 2, BTF_MEMBER_OFFSET(0, 0)),
BTF_END_RAW,
},
BTF_STR_SEC("\0tag1\0t\0m"),
},
},
};