Commit 8c5d71d9 authored by Daniel Müller's avatar Daniel Müller Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add test for libbpf_bpf_prog_type_str 



This change adds a test for libbpf_bpf_prog_type_str. The test retrieves
all variants of the bpf_prog_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/20220523230428.3077108-3-deso@posteo.net
parent d18616e7

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

0 → 100644
+57 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */



#include <ctype.h>

#include <test_progs.h>

#include <bpf/btf.h>



/*

 * Utility function uppercasing an entire string.

 */

static void uppercase(char *s)

{

	for (; *s != '\0'; s++)

		*s = toupper(*s);

}



/*

 * Test case to check that all bpf_prog_type variants are covered by

 * libbpf_bpf_prog_type_str.

 */

void test_libbpf_bpf_prog_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_prog_type and enumerate each value */

	id = btf__find_by_name_kind(btf, "bpf_prog_type", BTF_KIND_ENUM);

	if (!ASSERT_GT(id, 0, "bpf_prog_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_prog_type prog_type = (enum bpf_prog_type)e->val;

		const char *prog_type_name;

		const char *prog_type_str;

		char buf[256];



		prog_type_name = btf__str_by_offset(btf, e->name_off);

		prog_type_str = libbpf_bpf_prog_type_str(prog_type);

		ASSERT_OK_PTR(prog_type_str, prog_type_name);



		snprintf(buf, sizeof(buf), "BPF_PROG_TYPE_%s", prog_type_str);

		uppercase(buf);



		ASSERT_STREQ(buf, prog_type_name, "exp_str_value");

	}



cleanup:

	btf__free(btf);

}