tools/testing/selftests/bpf/prog_tests/rdonly_maps.c

   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 }