From: Yonghong Song <yhs@fb.com>
Date: Tue, 14 Sep 2021 15:30:36 -0700
Subject: selftests/bpf: Test libbpf API function btf__add_tag()
Patch-mainline: v5.16-rc1
Git-commit: 71d29c2d47d112404fe23e31cf33f7cccde75a8c
References: jsc#PED-1377
Add btf_write tests with btf__add_tag() function.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210914223036.247560-1-yhs@fb.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
tools/testing/selftests/bpf/btf_helpers.c | 7 ++++++-
tools/testing/selftests/bpf/prog_tests/btf_write.c | 21 +++++++++++++++++++++
2 files changed, 27 insertions(+), 1 deletion(-)
--- a/tools/testing/selftests/bpf/btf_helpers.c
+++ b/tools/testing/selftests/bpf/btf_helpers.c
@@ -24,11 +24,12 @@ static const char * const btf_kind_str_m
[BTF_KIND_VAR] = "VAR",
[BTF_KIND_DATASEC] = "DATASEC",
[BTF_KIND_FLOAT] = "FLOAT",
+ [BTF_KIND_TAG] = "TAG",
};
static const char *btf_kind_str(__u16 kind)
{
- if (kind > BTF_KIND_DATASEC)
+ if (kind > BTF_KIND_TAG)
return "UNKNOWN";
return btf_kind_str_mapping[kind];
}
@@ -177,6 +178,10 @@ int fprintf_btf_type_raw(FILE *out, cons
case BTF_KIND_FLOAT:
fprintf(out, " size=%u", t->size);
break;
+ case BTF_KIND_TAG:
+ fprintf(out, " type_id=%u component_idx=%d",
+ t->type, btf_tag(t)->component_idx);
+ break;
default:
break;
}
--- a/tools/testing/selftests/bpf/prog_tests/btf_write.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf_write.c
@@ -281,5 +281,26 @@ void test_btf_write() {
"[17] DATASEC 'datasec1' size=12 vlen=1\n"
"\ttype_id=1 offset=4 size=8", "raw_dump");
+ /* TAG */
+ id = btf__add_tag(btf, "tag1", 16, -1);
+ ASSERT_EQ(id, 18, "tag_id");
+ t = btf__type_by_id(btf, 18);
+ ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
+ ASSERT_EQ(btf_kind(t), BTF_KIND_TAG, "tag_kind");
+ ASSERT_EQ(t->type, 16, "tag_type");
+ ASSERT_EQ(btf_tag(t)->component_idx, -1, "tag_component_idx");
+ ASSERT_STREQ(btf_type_raw_dump(btf, 18),
+ "[18] TAG 'tag1' type_id=16 component_idx=-1", "raw_dump");
+
+ id = btf__add_tag(btf, "tag2", 14, 1);
+ ASSERT_EQ(id, 19, "tag_id");
+ t = btf__type_by_id(btf, 19);
+ ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag2", "tag_value");
+ ASSERT_EQ(btf_kind(t), BTF_KIND_TAG, "tag_kind");
+ ASSERT_EQ(t->type, 14, "tag_type");
+ ASSERT_EQ(btf_tag(t)->component_idx, 1, "tag_component_idx");
+ ASSERT_STREQ(btf_type_raw_dump(btf, 19),
+ "[19] TAG 'tag2' type_id=14 component_idx=1", "raw_dump");
+
btf__free(btf);
}