bpf/prog_tests/rdonly_maps.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <test_progs.h>
0003
0004 struct bss {
0005     unsigned did_run;
0006     unsigned iters;
0007     unsigned sum;
0008 };
0009
0010 struct rdonly_map_subtest {
0011     const char *subtest_name;
0012     const char *prog_name;
0013     unsigned exp_iters;
0014     unsigned exp_sum;
0015 };
0016
0017 void test_rdonly_maps(void)
0018 {
0019     const char *file = "test_rdonly_maps.o";
0020     struct rdonly_map_subtest subtests[] = {
0021         { "skip loop", "skip_loop", 0, 0 },
0022         { "part loop", "part_loop", 3, 2 + 3 + 4 },
0023         { "full loop", "full_loop", 4, 2 + 3 + 4 + 5 },
0024     };
0025     int i, err, zero = 0, duration = 0;
0026     struct bpf_link *link = NULL;
0027     struct bpf_program *prog;
0028     struct bpf_map *bss_map;
0029     struct bpf_object *obj;
0030     struct bss bss;
0031
0032     obj = bpf_object__open_file(file, NULL);
0033     if (!ASSERT_OK_PTR(obj, "obj_open"))
0034         return;
0035
0036     err = bpf_object__load(obj);
0037     if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno))
0038         goto cleanup;
0039
0040     bss_map = bpf_object__find_map_by_name(obj, ".bss");
0041     if (CHECK(!bss_map, "find_bss_map", "failed\n"))
0042         goto cleanup;
0043
0044     for (i = 0; i < ARRAY_SIZE(subtests); i++) {
0045         const struct rdonly_map_subtest *t = &subtests[i];
0046
0047         if (!test__start_subtest(t->subtest_name))
0048             continue;
0049
0050         prog = bpf_object__find_program_by_name(obj, t->prog_name);
0051         if (CHECK(!prog, "find_prog", "prog '%s' not found\n",
0052               t->prog_name))
0053             goto cleanup;
0054
0055         memset(&bss, 0, sizeof(bss));
0056         err = bpf_map_update_elem(bpf_map__fd(bss_map), &zero, &bss, 0);
0057         if (CHECK(err, "set_bss", "failed to set bss data: %d\n", err))
0058             goto cleanup;
0059
0060         link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
0061         if (!ASSERT_OK_PTR(link, "attach_prog"))
0062             goto cleanup;
0063
0064         /* trigger probe */
0065         usleep(1);
0066
0067         bpf_link__destroy(link);
0068         link = NULL;
0069
0070         err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &zero, &bss);
0071         if (CHECK(err, "get_bss", "failed to get bss data: %d\n", err))
0072             goto cleanup;
0073         if (CHECK(bss.did_run == 0, "check_run",
0074               "prog '%s' didn't run?\n", t->prog_name))
0075             goto cleanup;
0076         if (CHECK(bss.iters != t->exp_iters, "check_iters",
0077               "prog '%s' iters: %d, expected: %d\n",
0078               t->prog_name, bss.iters, t->exp_iters))
0079             goto cleanup;
0080         if (CHECK(bss.sum != t->exp_sum, "check_sum",
0081               "prog '%s' sum: %d, expected: %d\n",
0082               t->prog_name, bss.sum, t->exp_sum))
0083             goto cleanup;
0084     }
0085
0086 cleanup:
0087     bpf_link__destroy(link);
0088     bpf_object__close(obj);
0089 }