LXR linux/tools/testing/selftests/bpf/prog_tests/rdonly

   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.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 (CHECK(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj)))
  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, "test_rdo.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 (CHECK(IS_ERR(link), "attach_prog", "prog '%s', err %ld\n",
  62                          t->prog_name, PTR_ERR(link))) {
  63                        link = NULL;
  64                        goto cleanup;
  65                }
  66
  67                /* trigger probe */
  68                usleep(1);
  69
  70                bpf_link__destroy(link);
  71                link = NULL;
  72
  73                err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &zero, &bss);
  74                if (CHECK(err, "get_bss", "failed to get bss data: %d\n", err))
  75                        goto cleanup;
  76                if (CHECK(bss.did_run == 0, "check_run",
  77                          "prog '%s' didn't run?\n", t->prog_name))
  78                        goto cleanup;
  79                if (CHECK(bss.iters != t->exp_iters, "check_iters",
  80                          "prog '%s' iters: %d, expected: %d\n",
  81                          t->prog_name, bss.iters, t->exp_iters))
  82                        goto cleanup;
  83                if (CHECK(bss.sum != t->exp_sum, "check_sum",
  84                          "prog '%s' sum: %d, expected: %d\n",
  85                          t->prog_name, bss.sum, t->exp_sum))
  86                        goto cleanup;
  87        }
  88
  89cleanup:
  90        bpf_link__destroy(link);
  91        bpf_object__close(obj);
  92}
  93