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

   1// SPDX-License-Identifier: GPL-2.0
   2#include <test_progs.h>
   3#include <network_helpers.h>
   4
   5static 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
  18static 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        }
  43out:
  44        pthread_exit(arg);
  45}
  46
  47void 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;
  87close_prog:
  88        bpf_object__close(obj);
  89}
  90