1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3
4struct bss {
5	unsigned did_run;
6	unsigned iters;
7	unsigned sum;
8};
9
10struct rdonly_map_subtest {
11	const char *subtest_name;
12	const char *prog_name;
13	unsigned exp_iters;
14	unsigned exp_sum;
15};
16
17void 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
86cleanup:
87	bpf_link__destroy(link);
88	bpf_object__close(obj);
89}
90