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selftests/bpf: Add BTF_KIND_TAG unit tests 

Test good and bad variants of BTF_KIND_TAG encoding.

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/20210914223047.248223-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2021-09-14 15:30:47 -07:00 committed by Alexei Starovoitov
parent 3df3bd68d4
commit 35baba7a83
2 changed files with 248 additions and 0 deletions
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245
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -3661,6 +3661,249 @@ static struct btf_raw_test raw_tests[] = {
.err_str = "Invalid type_size",
},
{
.descr = "tag test #1, struct/member, well-formed",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_STRUCT_ENC(0, 2, 8), /* [2] */
BTF_MEMBER_ENC(NAME_TBD, 1, 0),
BTF_MEMBER_ENC(NAME_TBD, 1, 32),
BTF_TAG_ENC(NAME_TBD, 2, -1),
BTF_TAG_ENC(NAME_TBD, 2, 0),
BTF_TAG_ENC(NAME_TBD, 2, 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0m1\0m2\0tag1\0tag2\0tag3"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 8,
.key_type_id = 1,
.value_type_id = 2,
.max_entries = 1,
},
{
.descr = "tag test #2, union/member, well-formed",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_UNION_ENC(NAME_TBD, 2, 4), /* [2] */
BTF_MEMBER_ENC(NAME_TBD, 1, 0),
BTF_MEMBER_ENC(NAME_TBD, 1, 0),
BTF_TAG_ENC(NAME_TBD, 2, -1),
BTF_TAG_ENC(NAME_TBD, 2, 0),
BTF_TAG_ENC(NAME_TBD, 2, 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0t\0m1\0m2\0tag1\0tag2\0tag3"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 2,
.max_entries = 1,
},
{
.descr = "tag test #3, variable, well-formed",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_VAR_ENC(NAME_TBD, 1, 0), /* [2] */
BTF_VAR_ENC(NAME_TBD, 1, 1), /* [3] */
BTF_TAG_ENC(NAME_TBD, 2, -1),
BTF_TAG_ENC(NAME_TBD, 3, -1),
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0global\0tag1\0tag2"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
},
{
.descr = "tag test #4, func/parameter, well-formed",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_FUNC_PROTO_ENC(0, 2), /* [2] */
BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
BTF_FUNC_ENC(NAME_TBD, 2), /* [3] */
BTF_TAG_ENC(NAME_TBD, 3, -1),
BTF_TAG_ENC(NAME_TBD, 3, 0),
BTF_TAG_ENC(NAME_TBD, 3, 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0arg1\0arg2\0f\0tag1\0tag2\0tag3"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
},
{
.descr = "tag test #5, invalid value",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_VAR_ENC(NAME_TBD, 1, 0), /* [2] */
BTF_TAG_ENC(0, 2, -1),
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0tag"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid value",
},
{
.descr = "tag test #6, invalid target type",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_TAG_ENC(NAME_TBD, 1, -1),
BTF_END_RAW,
},
BTF_STR_SEC("\0tag1"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid type",
},
{
.descr = "tag test #7, invalid vlen",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_VAR_ENC(NAME_TBD, 1, 0), /* [2] */
BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_TAG, 0, 1), 2), (0),
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0tag1"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "vlen != 0",
},
{
.descr = "tag test #8, invalid kflag",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_VAR_ENC(NAME_TBD, 1, 0), /* [2] */
BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_TAG, 1, 0), 2), (-1),
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0tag1"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid btf_info kind_flag",
},
{
.descr = "tag test #9, var, invalid component_idx",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_VAR_ENC(NAME_TBD, 1, 0), /* [2] */
BTF_TAG_ENC(NAME_TBD, 2, 0),
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0tag"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid component_idx",
},
{
.descr = "tag test #10, struct member, invalid component_idx",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_STRUCT_ENC(0, 2, 8), /* [2] */
BTF_MEMBER_ENC(NAME_TBD, 1, 0),
BTF_MEMBER_ENC(NAME_TBD, 1, 32),
BTF_TAG_ENC(NAME_TBD, 2, 2),
BTF_END_RAW,
},
BTF_STR_SEC("\0m1\0m2\0tag"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 8,
.key_type_id = 1,
.value_type_id = 2,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid component_idx",
},
{
.descr = "tag test #11, func parameter, invalid component_idx",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_FUNC_PROTO_ENC(0, 2), /* [2] */
BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
BTF_FUNC_ENC(NAME_TBD, 2), /* [3] */
BTF_TAG_ENC(NAME_TBD, 3, 2),
BTF_END_RAW,
},
BTF_STR_SEC("\0arg1\0arg2\0f\0tag"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid component_idx",
},
{
.descr = "tag test #12, < -1 component_idx",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_FUNC_PROTO_ENC(0, 2), /* [2] */
BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
BTF_FUNC_ENC(NAME_TBD, 2), /* [3] */
BTF_TAG_ENC(NAME_TBD, 3, -2),
BTF_END_RAW,
},
BTF_STR_SEC("\0arg1\0arg2\0f\0tag"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid component_idx",
},
}; /* struct btf_raw_test raw_tests[] */
static const char *get_next_str(const char *start, const char *end)
@ -6801,6 +7044,8 @@ static int btf_type_size(const struct btf_type *t)
return base_size + sizeof(struct btf_var);
case BTF_KIND_DATASEC:
return base_size + vlen * sizeof(struct btf_var_secinfo);
case BTF_KIND_TAG:
return base_size + sizeof(struct btf_tag);
default:
fprintf(stderr, "Unsupported BTF_KIND:%u\n", kind);
return -EINVAL;

3
tools/testing/selftests/bpf/test_btf.h
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@ -69,4 +69,7 @@
#define BTF_TYPE_FLOAT_ENC(name, sz) \
BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz)
#define BTF_TAG_ENC(value, type, component_idx) \
BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_TAG, 0, 0), type), (component_idx)
#endif /* _TEST_BTF_H */