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
test_rdonly_maps(void)17 void test_rdonly_maps(void)
18 {
19 const char *prog_name_skip_loop = "raw_tracepoint/sys_enter:skip_loop";
20 const char *prog_name_part_loop = "raw_tracepoint/sys_enter:part_loop";
21 const char *prog_name_full_loop = "raw_tracepoint/sys_enter:full_loop";
22 const char *file = "test_rdonly_maps.o";
23 struct rdonly_map_subtest subtests[] = {
24 { "skip loop", prog_name_skip_loop, 0, 0 },
25 { "part loop", prog_name_part_loop, 3, 2 + 3 + 4 },
26 { "full loop", prog_name_full_loop, 4, 2 + 3 + 4 + 5 },
27 };
28 int i, err, zero = 0, duration = 0;
29 struct bpf_link *link = NULL;
30 struct bpf_program *prog;
31 struct bpf_map *bss_map;
32 struct bpf_object *obj;
33 struct bss bss;
34
35 obj = bpf_object__open_file(file, NULL);
36 if (CHECK(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj)))
37 return;
38
39 err = bpf_object__load(obj);
40 if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno))
41 goto cleanup;
42
43 bss_map = bpf_object__find_map_by_name(obj, "test_rdo.bss");
44 if (CHECK(!bss_map, "find_bss_map", "failed\n"))
45 goto cleanup;
46
47 for (i = 0; i < ARRAY_SIZE(subtests); i++) {
48 const struct rdonly_map_subtest *t = &subtests[i];
49
50 if (!test__start_subtest(t->subtest_name))
51 continue;
52
53 prog = bpf_object__find_program_by_title(obj, t->prog_name);
54 if (CHECK(!prog, "find_prog", "prog '%s' not found\n",
55 t->prog_name))
56 goto cleanup;
57
58 memset(&bss, 0, sizeof(bss));
59 err = bpf_map_update_elem(bpf_map__fd(bss_map), &zero, &bss, 0);
60 if (CHECK(err, "set_bss", "failed to set bss data: %d\n", err))
61 goto cleanup;
62
63 link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
64 if (CHECK(IS_ERR(link), "attach_prog", "prog '%s', err %ld\n",
65 t->prog_name, PTR_ERR(link))) {
66 link = NULL;
67 goto cleanup;
68 }
69
70 /* trigger probe */
71 usleep(1);
72
73 bpf_link__destroy(link);
74 link = NULL;
75
76 err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &zero, &bss);
77 if (CHECK(err, "get_bss", "failed to get bss data: %d\n", err))
78 goto cleanup;
79 if (CHECK(bss.did_run == 0, "check_run",
80 "prog '%s' didn't run?\n", t->prog_name))
81 goto cleanup;
82 if (CHECK(bss.iters != t->exp_iters, "check_iters",
83 "prog '%s' iters: %d, expected: %d\n",
84 t->prog_name, bss.iters, t->exp_iters))
85 goto cleanup;
86 if (CHECK(bss.sum != t->exp_sum, "check_sum",
87 "prog '%s' sum: %d, expected: %d\n",
88 t->prog_name, bss.sum, t->exp_sum))
89 goto cleanup;
90 }
91
92 cleanup:
93 bpf_link__destroy(link);
94 bpf_object__close(obj);
95 }
96