1// SPDX-License-Identifier: GPL-2.0
2#include "test_progs.h"
3#include "network_helpers.h"
4
5static __u32 duration;
6
7static void test_global_func_args0(struct bpf_object *obj)
8{
9	int err, i, map_fd, actual_value;
10	const char *map_name = "values";
11
12	map_fd = bpf_find_map(__func__, obj, map_name);
13	if (CHECK(map_fd < 0, "bpf_find_map", "cannot find BPF map %s: %s\n",
14		map_name, strerror(errno)))
15		return;
16
17	struct {
18		const char *descr;
19		int expected_value;
20	} tests[] = {
21		{"passing NULL pointer", 0},
22		{"returning value", 1},
23		{"reading local variable", 100 },
24		{"writing local variable", 101 },
25		{"reading global variable", 42 },
26		{"writing global variable", 43 },
27		{"writing to pointer-to-pointer", 1 },
28	};
29
30	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
31		const int expected_value = tests[i].expected_value;
32
33		err = bpf_map_lookup_elem(map_fd, &i, &actual_value);
34
35		CHECK(err || actual_value != expected_value, tests[i].descr,
36			 "err %d result %d expected %d\n", err, actual_value, expected_value);
37	}
38}
39
40void test_global_func_args(void)
41{
42	const char *file = "./test_global_func_args.bpf.o";
43	struct bpf_object *obj;
44	int err, prog_fd;
45	LIBBPF_OPTS(bpf_test_run_opts, topts,
46		.data_in = &pkt_v4,
47		.data_size_in = sizeof(pkt_v4),
48		.repeat = 1,
49	);
50
51	err = bpf_prog_test_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
52	if (CHECK(err, "load program", "error %d loading %s\n", err, file))
53		return;
54
55	err = bpf_prog_test_run_opts(prog_fd, &topts);
56	ASSERT_OK(err, "test_run");
57	ASSERT_OK(topts.retval, "test_run retval");
58
59	test_global_func_args0(obj);
60
61	bpf_object__close(obj);
62}
63