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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include <network_helpers.h>
   4
   5 static void *spin_lock_thread(void *arg)
   6 {
   7         int err, prog_fd = *(u32 *) arg;
   8         LIBBPF_OPTS(bpf_test_run_opts, topts,
   9                 .data_in = &pkt_v4,
  10                 .data_size_in = sizeof(pkt_v4),
  11                 .repeat = 10000,
  12         );
  13
  14         err = bpf_prog_test_run_opts(prog_fd, &topts);
  15         ASSERT_OK(err, "test_run_opts err");
  16         ASSERT_OK(topts.retval, "test_run_opts retval");
  17
  18         pthread_exit(arg);
  19 }
  20
  21 static void *parallel_map_access(void *arg)
  22 {
  23         int err, map_fd = *(u32 *) arg;
  24         int vars[17], i, j, rnd, key = 0;
  25
  26         for (i = 0; i < 10000; i++) {
  27                 err = bpf_map_lookup_elem_flags(map_fd, &key, vars, BPF_F_LOCK);
  28                 if (CHECK_FAIL(err)) {
  29                         printf("lookup failed\n");
  30                         goto out;
  31                 }
  32                 if (CHECK_FAIL(vars[0] != 0)) {
  33                         printf("lookup #%d var[0]=%d\n", i, vars[0]);
  34                         goto out;
  35                 }
  36                 rnd = vars[1];
  37                 for (j = 2; j < 17; j++) {
  38                         if (vars[j] == rnd)
  39                                 continue;
  40                         printf("lookup #%d var[1]=%d var[%d]=%d\n",
  41                                i, rnd, j, vars[j]);
  42                         CHECK_FAIL(vars[j] != rnd);
  43                         goto out;
  44                 }
  45         }
  46 out:
  47         pthread_exit(arg);
  48 }
  49
  50 void test_map_lock(void)
  51 {
  52         const char *file = "./test_map_lock.bpf.o";
  53         int prog_fd, map_fd[2], vars[17] = {};
  54         pthread_t thread_id[6];
  55         struct bpf_object *obj = NULL;
  56         int err = 0, key = 0, i;
  57         void *ret;
  58
  59         err = bpf_prog_test_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
  60         if (CHECK_FAIL(err)) {
  61                 printf("test_map_lock:bpf_prog_test_load errno %d\n", errno);
  62                 goto close_prog;
  63         }
  64         map_fd[0] = bpf_find_map(__func__, obj, "hash_map");
  65         if (CHECK_FAIL(map_fd[0] < 0))
  66                 goto close_prog;
  67         map_fd[1] = bpf_find_map(__func__, obj, "array_map");
  68         if (CHECK_FAIL(map_fd[1] < 0))
  69                 goto close_prog;
  70
  71         bpf_map_update_elem(map_fd[0], &key, vars, BPF_F_LOCK);
  72
  73         for (i = 0; i < 4; i++)
  74                 if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
  75                                               &spin_lock_thread, &prog_fd)))
  76                         goto close_prog;
  77         for (i = 4; i < 6; i++)
  78                 if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
  79                                               &parallel_map_access,
  80                                               &map_fd[i - 4])))
  81                         goto close_prog;
  82         for (i = 0; i < 4; i++)
  83                 if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
  84                                ret != (void *)&prog_fd))
  85                         goto close_prog;
  86         for (i = 4; i < 6; i++)
  87                 if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
  88                                ret != (void *)&map_fd[i - 4]))
  89                         goto close_prog;
  90 close_prog:
  91         bpf_object__close(obj);
  92 }