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selftests/bpf: Test parsing of (multi-)split BTF

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Write raw BTF to files, parse it and compare to original;
this allows us to test parsing of (multi-)split BTF code.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251104203309.318429-3-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire
2025-11-04 20:33:09 +00:00
committed by Andrii Nakryiko
parent 4f596acc26
commit cc77a20389
1 changed files with 85 additions and 2 deletions
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87
tools/testing/selftests/bpf/prog_tests/btf_split.c
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@@ -12,11 +12,45 @@ static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
vfprintf(ctx, fmt, args);
}
/* Write raw BTF to file, return number of bytes written or negative errno */
static ssize_t btf_raw_write(struct btf *btf, char *file)
{
ssize_t written = 0;
const void *data;
__u32 size = 0;
int fd, ret;
fd = mkstemp(file);
if (!ASSERT_GE(fd, 0, "create_file"))
return -errno;
data = btf__raw_data(btf, &size);
if (!ASSERT_OK_PTR(data, "btf__raw_data")) {
close(fd);
return -EINVAL;
}
while (written < size) {
ret = write(fd, data + written, size - written);
if (!ASSERT_GE(ret, 0, "write succeeded")) {
close(fd);
return -errno;
}
written += ret;
}
close(fd);
return written;
}
static void __test_btf_split(bool multi)
{
char multisplit_btf_file[] = "/tmp/test_btf_multisplit.XXXXXX";
char split_btf_file[] = "/tmp/test_btf_split.XXXXXX";
char base_btf_file[] = "/tmp/test_btf_base.XXXXXX";
ssize_t multisplit_btf_sz = 0, split_btf_sz = 0, base_btf_sz = 0;
struct btf_dump *d = NULL;
const struct btf_type *t;
struct btf *btf1, *btf2, *btf3 = NULL;
const struct btf_type *t, *ot;
struct btf *btf1 = NULL, *btf2 = NULL, *btf3 = NULL;
struct btf *btf4 = NULL, *btf5 = NULL, *btf6 = NULL;
int str_off, i, err;
btf1 = btf__new_empty();
@@ -123,6 +157,45 @@ static void __test_btf_split(bool multi)
" int uf2;\n"
"};\n\n", "c_dump");
/* write base, split BTFs to files and ensure parsing succeeds */
base_btf_sz = btf_raw_write(btf1, base_btf_file);
if (base_btf_sz < 0)
goto cleanup;
split_btf_sz = btf_raw_write(btf2, split_btf_file);
if (split_btf_sz < 0)
goto cleanup;
btf4 = btf__parse(base_btf_file, NULL);
if (!ASSERT_OK_PTR(btf4, "parse_base"))
goto cleanup;
btf5 = btf__parse_split(split_btf_file, btf4);
if (!ASSERT_OK_PTR(btf5, "parse_split"))
goto cleanup;
if (multi) {
multisplit_btf_sz = btf_raw_write(btf3, multisplit_btf_file);
if (multisplit_btf_sz < 0)
goto cleanup;
btf6 = btf__parse_split(multisplit_btf_file, btf5);
if (!ASSERT_OK_PTR(btf6, "parse_multisplit"))
goto cleanup;
} else {
btf6 = btf5;
}
if (!ASSERT_EQ(btf__type_cnt(btf3), btf__type_cnt(btf6), "cmp_type_cnt"))
goto cleanup;
/* compare parsed to original BTF */
for (i = 1; i < btf__type_cnt(btf6); i++) {
t = btf__type_by_id(btf6, i);
if (!ASSERT_OK_PTR(t, "type_in_parsed_btf"))
goto cleanup;
ot = btf__type_by_id(btf3, i);
if (!ASSERT_OK_PTR(ot, "type_in_orig_btf"))
goto cleanup;
if (!ASSERT_EQ(memcmp(t, ot, sizeof(*ot)), 0, "cmp_parsed_orig_btf"))
goto cleanup;
}
cleanup:
if (dump_buf_file)
fclose(dump_buf_file);
@@ -132,6 +205,16 @@ cleanup:
btf__free(btf2);
if (btf2 != btf3)
btf__free(btf3);
btf__free(btf4);
btf__free(btf5);
if (btf5 != btf6)
btf__free(btf6);
if (base_btf_sz > 0)
unlink(base_btf_file);
if (split_btf_sz > 0)
unlink(split_btf_file);
if (multisplit_btf_sz > 0)
unlink(multisplit_btf_file);
}
void test_btf_split(void)