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selftests/bpf: Test libbpf API function btf__add_type_tag() 

Add unit tests for btf__add_type_tag().

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/20211112012625.1505748-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2021-11-11 17:26:25 -08:00 committed by Alexei Starovoitov
parent 3da5ba6f05
commit 0dc8587220
2 changed files with 43 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/testing/selftests/bpf/btf_helpers.c
View File

@ -25,11 +25,12 @@ static const char * const btf_kind_str_mapping[] = {
[BTF_KIND_DATASEC] = "DATASEC",
[BTF_KIND_FLOAT] = "FLOAT",
[BTF_KIND_DECL_TAG] = "DECL_TAG",
[BTF_KIND_TYPE_TAG] = "TYPE_TAG",
};
static const char *btf_kind_str(__u16 kind)
{
if (kind > BTF_KIND_DECL_TAG)
if (kind > BTF_KIND_TYPE_TAG)
return "UNKNOWN";
return btf_kind_str_mapping[kind];
}
@ -109,6 +110,7 @@ int fprintf_btf_type_raw(FILE *out, const struct btf *btf, __u32 id)
case BTF_KIND_VOLATILE:
case BTF_KIND_RESTRICT:
case BTF_KIND_TYPEDEF:
case BTF_KIND_TYPE_TAG:
fprintf(out, " type_id=%u", t->type);
break;
case BTF_KIND_ARRAY: {

67
tools/testing/selftests/bpf/prog_tests/btf_write.c
View File

@ -297,6 +297,16 @@ static void gen_btf(struct btf *btf)
ASSERT_EQ(btf_decl_tag(t)->component_idx, 1, "tag_component_idx");
ASSERT_STREQ(btf_type_raw_dump(btf, 19),
"[19] DECL_TAG 'tag2' type_id=14 component_idx=1", "raw_dump");
/* TYPE_TAG */
id = btf__add_type_tag(btf, "tag1", 1);
ASSERT_EQ(id, 20, "tag_id");
t = btf__type_by_id(btf, 20);
ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
ASSERT_EQ(btf_kind(t), BTF_KIND_TYPE_TAG, "tag_kind");
ASSERT_EQ(t->type, 1, "tag_type");
ASSERT_STREQ(btf_type_raw_dump(btf, 20),
"[20] TYPE_TAG 'tag1' type_id=1", "raw_dump");
}
static void test_btf_add()
@ -337,7 +347,8 @@ static void test_btf_add()
"[17] DATASEC 'datasec1' size=12 vlen=1\n"
"\ttype_id=1 offset=4 size=8",
"[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
"[19] DECL_TAG 'tag2' type_id=14 component_idx=1");
"[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
"[20] TYPE_TAG 'tag1' type_id=1");
btf__free(btf);
}
@ -359,7 +370,7 @@ static void test_btf_add_btf()
gen_btf(btf2);
id = btf__add_btf(btf1, btf2);
if (!ASSERT_EQ(id, 20, "id"))
if (!ASSERT_EQ(id, 21, "id"))
goto cleanup;
VALIDATE_RAW_BTF(
@ -391,35 +402,37 @@ static void test_btf_add_btf()
"\ttype_id=1 offset=4 size=8",
"[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
"[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
"[20] TYPE_TAG 'tag1' type_id=1",
/* types appended from the second BTF */
"[20] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[21] PTR '(anon)' type_id=20",
"[22] CONST '(anon)' type_id=24",
"[23] VOLATILE '(anon)' type_id=22",
"[24] RESTRICT '(anon)' type_id=23",
"[25] ARRAY '(anon)' type_id=21 index_type_id=20 nr_elems=10",
"[26] STRUCT 's1' size=8 vlen=2\n"
"\t'f1' type_id=20 bits_offset=0\n"
"\t'f2' type_id=20 bits_offset=32 bitfield_size=16",
"[27] UNION 'u1' size=8 vlen=1\n"
"\t'f1' type_id=20 bits_offset=0 bitfield_size=16",
"[28] ENUM 'e1' size=4 vlen=2\n"
"[21] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[22] PTR '(anon)' type_id=21",
"[23] CONST '(anon)' type_id=25",
"[24] VOLATILE '(anon)' type_id=23",
"[25] RESTRICT '(anon)' type_id=24",
"[26] ARRAY '(anon)' type_id=22 index_type_id=21 nr_elems=10",
"[27] STRUCT 's1' size=8 vlen=2\n"
"\t'f1' type_id=21 bits_offset=0\n"
"\t'f2' type_id=21 bits_offset=32 bitfield_size=16",
"[28] UNION 'u1' size=8 vlen=1\n"
"\t'f1' type_id=21 bits_offset=0 bitfield_size=16",
"[29] ENUM 'e1' size=4 vlen=2\n"
"\t'v1' val=1\n"
"\t'v2' val=2",
"[29] FWD 'struct_fwd' fwd_kind=struct",
"[30] FWD 'union_fwd' fwd_kind=union",
"[31] ENUM 'enum_fwd' size=4 vlen=0",
"[32] TYPEDEF 'typedef1' type_id=20",
"[33] FUNC 'func1' type_id=34 linkage=global",
"[34] FUNC_PROTO '(anon)' ret_type_id=20 vlen=2\n"
"\t'p1' type_id=20\n"
"\t'p2' type_id=21",
"[35] VAR 'var1' type_id=20, linkage=global-alloc",
"[36] DATASEC 'datasec1' size=12 vlen=1\n"
"\ttype_id=20 offset=4 size=8",
"[37] DECL_TAG 'tag1' type_id=35 component_idx=-1",
"[38] DECL_TAG 'tag2' type_id=33 component_idx=1");
"[30] FWD 'struct_fwd' fwd_kind=struct",
"[31] FWD 'union_fwd' fwd_kind=union",
"[32] ENUM 'enum_fwd' size=4 vlen=0",
"[33] TYPEDEF 'typedef1' type_id=21",
"[34] FUNC 'func1' type_id=35 linkage=global",
"[35] FUNC_PROTO '(anon)' ret_type_id=21 vlen=2\n"
"\t'p1' type_id=21\n"
"\t'p2' type_id=22",
"[36] VAR 'var1' type_id=21, linkage=global-alloc",
"[37] DATASEC 'datasec1' size=12 vlen=1\n"
"\ttype_id=21 offset=4 size=8",
"[38] DECL_TAG 'tag1' type_id=36 component_idx=-1",
"[39] DECL_TAG 'tag2' type_id=34 component_idx=1",
"[40] TYPE_TAG 'tag1' type_id=21");
cleanup:
btf__free(btf1);