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selftests/bpf: Add a BTF verification test for kflagged type_tag

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Add a BTF verification test case for a type_tag with a kflag set.
Type tags with a kflag are now valid.

Add BTF_DECL_ATTR_ENC and BTF_TYPE_ATTR_ENC test helper macros,
corresponding to *_TAG_ENC.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250130201239.1429648-7-ihor.solodrai@linux.dev
This commit is contained in:
Ihor Solodrai 2025-01-30 12:12:39 -08:00 committed by Andrii Nakryiko
parent 53ee0d66d7
commit 770cdcf4a5
2 changed files with 24 additions and 1 deletions
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19
tools/testing/selftests/bpf/prog_tests/btf.c
View File

@ -3870,7 +3870,7 @@ static struct btf_raw_test raw_tests[] = {
.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_DECL_TAG, 1, 0), 2), (-1),
BTF_DECL_ATTR_ENC(NAME_TBD, 2, -1),
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0tag1"),
@ -4204,6 +4204,23 @@ static struct btf_raw_test raw_tests[] = {
.btf_load_err = true,
.err_str = "Type tags don't precede modifiers",
},
{
.descr = "type_tag test #7, tag with kflag",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_TYPE_ATTR_ENC(NAME_TBD, 1), /* [2] */
BTF_PTR_ENC(2), /* [3] */
BTF_END_RAW,
},
BTF_STR_SEC("\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,
},
{
.descr = "enum64 test #1, unsigned, size 8",
.raw_types = {

6
tools/testing/selftests/bpf/test_btf.h
View File

@ -72,9 +72,15 @@
#define BTF_TYPE_FLOAT_ENC(name, sz) \
BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz)
#define BTF_DECL_ATTR_ENC(value, type, component_idx) \
BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 1, 0), type), (component_idx)
#define BTF_DECL_TAG_ENC(value, type, component_idx) \
BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), type), (component_idx)
#define BTF_TYPE_ATTR_ENC(value, type) \
BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_TYPE_TAG, 1, 0), type)
#define BTF_TYPE_TAG_ENC(value, type) \
BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_TYPE_TAG, 0, 0), type)