1
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.o";
43 __u32 retval;
44 struct bpf_object *obj;
45 int err, prog_fd;
46
47 err = bpf_prog_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
48 if (CHECK(err, "load program", "error %d loading %s\n", err, file))
49 return;
50
51 err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
52 NULL, NULL, &retval, &duration);
53 CHECK(err || retval, "pass global func args run",
54 "err %d errno %d retval %d duration %d\n",
55 err, errno, retval, duration);
56
57 test_global_func_args0(obj);
58
59 bpf_object__close(obj);
60}
61
