Commit 71d29c2d authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
Browse files

selftests/bpf: Test libbpf API function btf__add_tag() 



Add btf_write tests with btf__add_tag() function.

Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210914223036.247560-1-yhs@fb.com
parent 5c07f2fe

tools/testing/selftests/bpf/btf_helpers.c

+6 −1
Original line number Diff line number Diff line
@@ -24,11 +24,12 @@ static const char * const btf_kind_str_mapping[] = { 
	[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, const struct btf *btf, __u32 id) 
	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;

	}

tools/testing/selftests/bpf/prog_tests/btf_write.c

+21 −0
Original line number Diff line number Diff line
@@ -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);

}