Commit dea73da2 authored by Daniel Müller's avatar Daniel Müller Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add test for libbpf_bpf_link_type_str 



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: default avatarDaniel Müller <deso@posteo.net>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarQuentin Monnet <quentin@isovalent.com>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220523230428.3077108-12-deso@posteo.net
parent ba5d1b58

tools/testing/selftests/bpf/prog_tests/libbpf_str.c

+48 −0
Original line number Diff line number Diff line
@@ -59,6 +59,51 @@ static void test_libbpf_bpf_attach_type_str(void) 
	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();