1 // SPDX-License-Identifier: GPL-2.0
2 #include "test_progs.h"
3 #include "network_helpers.h"
4
5 static __u32 duration;
6
7 static 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
40 void 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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.