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

   1// SPDX-License-Identifier: GPL-2.0
   2#include <test_progs.h>
   3
   4void test_stacktrace_map_raw_tp(void)
   5{
   6        const char *prog_name = "tracepoint/sched/sched_switch";
   7        int control_map_fd, stackid_hmap_fd, stackmap_fd;
   8        const char *file = "./test_stacktrace_map.o";
   9        __u32 key, val, duration = 0;
  10        int err, prog_fd;
  11        struct bpf_program *prog;
  12        struct bpf_object *obj;
  13        struct bpf_link *link = NULL;
  14
  15        err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
  16        if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
  17                return;
  18
  19        prog = bpf_object__find_program_by_title(obj, prog_name);
  20        if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
  21                goto close_prog;
  22
  23        link = bpf_program__attach_raw_tracepoint(prog, "sched_switch");
  24        if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
  25                goto close_prog;
  26
  27        /* find map fds */
  28        control_map_fd = bpf_find_map(__func__, obj, "control_map");
  29        if (CHECK_FAIL(control_map_fd < 0))
  30                goto close_prog;
  31
  32        stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");
  33        if (CHECK_FAIL(stackid_hmap_fd < 0))
  34                goto close_prog;
  35
  36        stackmap_fd = bpf_find_map(__func__, obj, "stackmap");
  37        if (CHECK_FAIL(stackmap_fd < 0))
  38                goto close_prog;
  39
  40        /* give some time for bpf program run */
  41        sleep(1);
  42
  43        /* disable stack trace collection */
  44        key = 0;
  45        val = 1;
  46        bpf_map_update_elem(control_map_fd, &key, &val, 0);
  47
  48        /* for every element in stackid_hmap, we can find a corresponding one
  49         * in stackmap, and vise versa.
  50         */
  51        err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
  52        if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",
  53                  "err %d errno %d\n", err, errno))
  54                goto close_prog;
  55
  56        err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
  57        if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",
  58                  "err %d errno %d\n", err, errno))
  59                goto close_prog;
  60
  61close_prog:
  62        bpf_link__destroy(link);
  63        bpf_object__close(obj);
  64}
  65