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         __u32 duration, retval;
   8         int err, prog_fd = *(u32 *) arg;
   9
  10         err = bpf_prog_test_run(prog_fd, 10000, &pkt_v4, sizeof(pkt_v4),
  11                                 NULL, NULL, &retval, &duration);
  12         CHECK(err || retval, "",
  13               "err %d errno %d retval %d duration %d\n",
  14               err, errno, retval, duration);
  15         pthread_exit(arg);
  16 }
  17
  18 static void *parallel_map_access(void *arg)
  19 {
  20         int err, map_fd = *(u32 *) arg;
  21         int vars[17], i, j, rnd, key = 0;
  22
  23         for (i = 0; i < 10000; i++) {
  24                 err = bpf_map_lookup_elem_flags(map_fd, &key, vars, BPF_F_LOCK);
  25                 if (CHECK_FAIL(err)) {
  26                         printf("lookup failed\n");
  27                         goto out;
  28                 }
  29                 if (CHECK_FAIL(vars[0] != 0)) {
  30                         printf("lookup #%d var[0]=%d\n", i, vars[0]);
  31                         goto out;
  32                 }
  33                 rnd = vars[1];
  34                 for (j = 2; j < 17; j++) {
  35                         if (vars[j] == rnd)
  36                                 continue;
  37                         printf("lookup #%d var[1]=%d var[%d]=%d\n",
  38                                i, rnd, j, vars[j]);
  39                         CHECK_FAIL(vars[j] != rnd);
  40                         goto out;
  41                 }
  42         }
  43 out:
  44         pthread_exit(arg);
  45 }
  46
  47 void test_map_lock(void)
  48 {
  49         const char *file = "./test_map_lock.o";
  50         int prog_fd, map_fd[2], vars[17] = {};
  51         pthread_t thread_id[6];
  52         struct bpf_object *obj = NULL;
  53         int err = 0, key = 0, i;
  54         void *ret;
  55
  56         err = bpf_prog_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
  57         if (CHECK_FAIL(err)) {
  58                 printf("test_map_lock:bpf_prog_load errno %d\n", errno);
  59                 goto close_prog;
  60         }
  61         map_fd[0] = bpf_find_map(__func__, obj, "hash_map");
  62         if (CHECK_FAIL(map_fd[0] < 0))
  63                 goto close_prog;
  64         map_fd[1] = bpf_find_map(__func__, obj, "array_map");
  65         if (CHECK_FAIL(map_fd[1] < 0))
  66                 goto close_prog;
  67
  68         bpf_map_update_elem(map_fd[0], &key, vars, BPF_F_LOCK);
  69
  70         for (i = 0; i < 4; i++)
  71                 if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
  72                                               &spin_lock_thread, &prog_fd)))
  73                         goto close_prog;
  74         for (i = 4; i < 6; i++)
  75                 if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
  76                                               &parallel_map_access,
  77                                               &map_fd[i - 4])))
  78                         goto close_prog;
  79         for (i = 0; i < 4; i++)
  80                 if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
  81                                ret != (void *)&prog_fd))
  82                         goto close_prog;
  83         for (i = 4; i < 6; i++)
  84                 if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
  85                                ret != (void *)&map_fd[i - 4]))
  86                         goto close_prog;
  87 close_prog:
  88         bpf_object__close(obj);
  89 }