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selftests/bpf: Add test for libbpf_bpf_link_type_str

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This change adds a test for libbpf_bpf_link_type_str. The test retrieves
all variants of the bpf_link_type enumeration using BTF and makes sure
that the function under test works as expected for them.

Signed-off-by: Daniel Müller <deso@posteo.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220523230428.3077108-12-deso@posteo.net
This commit is contained in:
Daniel Müller 2022-05-23 23:04:27 +00:00 committed by Andrii Nakryiko
parent ba5d1b5802
commit dea73da221
1 changed files with 48 additions and 0 deletions
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48
tools/testing/selftests/bpf/prog_tests/libbpf_str.c
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@ -59,6 +59,51 @@ cleanup:
btf__free(btf);
}
/*
* Test case to check that all bpf_link_type variants are covered by
* libbpf_bpf_link_type_str.
*/
static void test_libbpf_bpf_link_type_str(void)
{
struct btf *btf;
const struct btf_type *t;
const struct btf_enum *e;
int i, n, id;
btf = btf__parse("/sys/kernel/btf/vmlinux", NULL);
if (!ASSERT_OK_PTR(btf, "btf_parse"))
return;
/* find enum bpf_link_type and enumerate each value */
id = btf__find_by_name_kind(btf, "bpf_link_type", BTF_KIND_ENUM);
if (!ASSERT_GT(id, 0, "bpf_link_type_id"))
goto cleanup;
t = btf__type_by_id(btf, id);
e = btf_enum(t);
n = btf_vlen(t);
for (i = 0; i < n; e++, i++) {
enum bpf_link_type link_type = (enum bpf_link_type)e->val;
const char *link_type_name;
const char *link_type_str;
char buf[256];
if (link_type == MAX_BPF_LINK_TYPE)
continue;
link_type_name = btf__str_by_offset(btf, e->name_off);
link_type_str = libbpf_bpf_link_type_str(link_type);
ASSERT_OK_PTR(link_type_str, link_type_name);
snprintf(buf, sizeof(buf), "BPF_LINK_TYPE_%s", link_type_str);
uppercase(buf);
ASSERT_STREQ(buf, link_type_name, "exp_str_value");
}
cleanup:
btf__free(btf);
}
/*
* Test case to check that all bpf_map_type variants are covered by
* libbpf_bpf_map_type_str.
@ -151,6 +196,9 @@ void test_libbpf_str(void)
if (test__start_subtest("bpf_attach_type_str"))
test_libbpf_bpf_attach_type_str();
if (test__start_subtest("bpf_link_type_str"))
test_libbpf_bpf_link_type_str();
if (test__start_subtest("bpf_map_type_str"))
test_libbpf_bpf_map_type_str();