1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 
4 struct bss {
5 	unsigned did_run;
6 	unsigned iters;
7 	unsigned sum;
8 };
9 
10 struct rdonly_map_subtest {
11 	const char *subtest_name;
12 	const char *prog_name;
13 	unsigned exp_iters;
14 	unsigned exp_sum;
15 };
16 
17 void test_rdonly_maps(void)
18 {
19 	const char *file = "test_rdonly_maps.bpf.o";
20 	struct rdonly_map_subtest subtests[] = {
21 		{ "skip loop", "skip_loop", 0, 0 },
22 		{ "part loop", "part_loop", 3, 2 + 3 + 4 },
23 		{ "full loop", "full_loop", 4, 2 + 3 + 4 + 5 },
24 	};
25 	int i, err, zero = 0, duration = 0;
26 	struct bpf_link *link = NULL;
27 	struct bpf_program *prog;
28 	struct bpf_map *bss_map;
29 	struct bpf_object *obj;
30 	struct bss bss;
31 
32 	obj = bpf_object__open_file(file, NULL);
33 	if (!ASSERT_OK_PTR(obj, "obj_open"))
34 		return;
35 
36 	err = bpf_object__load(obj);
37 	if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno))
38 		goto cleanup;
39 
40 	bss_map = bpf_object__find_map_by_name(obj, ".bss");
41 	if (CHECK(!bss_map, "find_bss_map", "failed\n"))
42 		goto cleanup;
43 
44 	for (i = 0; i < ARRAY_SIZE(subtests); i++) {
45 		const struct rdonly_map_subtest *t = &subtests[i];
46 
47 		if (!test__start_subtest(t->subtest_name))
48 			continue;
49 
50 		prog = bpf_object__find_program_by_name(obj, t->prog_name);
51 		if (CHECK(!prog, "find_prog", "prog '%s' not found\n",
52 			  t->prog_name))
53 			goto cleanup;
54 
55 		memset(&bss, 0, sizeof(bss));
56 		err = bpf_map_update_elem(bpf_map__fd(bss_map), &zero, &bss, 0);
57 		if (CHECK(err, "set_bss", "failed to set bss data: %d\n", err))
58 			goto cleanup;
59 
60 		link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
61 		if (!ASSERT_OK_PTR(link, "attach_prog"))
62 			goto cleanup;
63 
64 		/* trigger probe */
65 		usleep(1);
66 
67 		bpf_link__destroy(link);
68 		link = NULL;
69 
70 		err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &zero, &bss);
71 		if (CHECK(err, "get_bss", "failed to get bss data: %d\n", err))
72 			goto cleanup;
73 		if (CHECK(bss.did_run == 0, "check_run",
74 			  "prog '%s' didn't run?\n", t->prog_name))
75 			goto cleanup;
76 		if (CHECK(bss.iters != t->exp_iters, "check_iters",
77 			  "prog '%s' iters: %d, expected: %d\n",
78 			  t->prog_name, bss.iters, t->exp_iters))
79 			goto cleanup;
80 		if (CHECK(bss.sum != t->exp_sum, "check_sum",
81 			  "prog '%s' sum: %d, expected: %d\n",
82 			  t->prog_name, bss.sum, t->exp_sum))
83 			goto cleanup;
84 	}
85 
86 cleanup:
87 	bpf_link__destroy(link);
88 	bpf_object__close(obj);
89 }
90