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

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