bpf/prog_tests/map_lock.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <test_progs.h>
0003 #include <network_helpers.h>
0004
0005 static void *spin_lock_thread(void *arg)
0006 {
0007     int err, prog_fd = *(u32 *) arg;
0008     LIBBPF_OPTS(bpf_test_run_opts, topts,
0009         .data_in = &pkt_v4,
0010         .data_size_in = sizeof(pkt_v4),
0011         .repeat = 10000,
0012     );
0013
0014     err = bpf_prog_test_run_opts(prog_fd, &topts);
0015     ASSERT_OK(err, "test_run_opts err");
0016     ASSERT_OK(topts.retval, "test_run_opts retval");
0017
0018     pthread_exit(arg);
0019 }
0020
0021 static void *parallel_map_access(void *arg)
0022 {
0023     int err, map_fd = *(u32 *) arg;
0024     int vars[17], i, j, rnd, key = 0;
0025
0026     for (i = 0; i < 10000; i++) {
0027         err = bpf_map_lookup_elem_flags(map_fd, &key, vars, BPF_F_LOCK);
0028         if (CHECK_FAIL(err)) {
0029             printf("lookup failed\n");
0030             goto out;
0031         }
0032         if (CHECK_FAIL(vars[0] != 0)) {
0033             printf("lookup #%d var[0]=%d\n", i, vars[0]);
0034             goto out;
0035         }
0036         rnd = vars[1];
0037         for (j = 2; j < 17; j++) {
0038             if (vars[j] == rnd)
0039                 continue;
0040             printf("lookup #%d var[1]=%d var[%d]=%d\n",
0041                    i, rnd, j, vars[j]);
0042             CHECK_FAIL(vars[j] != rnd);
0043             goto out;
0044         }
0045     }
0046 out:
0047     pthread_exit(arg);
0048 }
0049
0050 void test_map_lock(void)
0051 {
0052     const char *file = "./test_map_lock.o";
0053     int prog_fd, map_fd[2], vars[17] = {};
0054     pthread_t thread_id[6];
0055     struct bpf_object *obj = NULL;
0056     int err = 0, key = 0, i;
0057     void *ret;
0058
0059     err = bpf_prog_test_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
0060     if (CHECK_FAIL(err)) {
0061         printf("test_map_lock:bpf_prog_test_load errno %d\n", errno);
0062         goto close_prog;
0063     }
0064     map_fd[0] = bpf_find_map(__func__, obj, "hash_map");
0065     if (CHECK_FAIL(map_fd[0] < 0))
0066         goto close_prog;
0067     map_fd[1] = bpf_find_map(__func__, obj, "array_map");
0068     if (CHECK_FAIL(map_fd[1] < 0))
0069         goto close_prog;
0070
0071     bpf_map_update_elem(map_fd[0], &key, vars, BPF_F_LOCK);
0072
0073     for (i = 0; i < 4; i++)
0074         if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
0075                           &spin_lock_thread, &prog_fd)))
0076             goto close_prog;
0077     for (i = 4; i < 6; i++)
0078         if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
0079                           &parallel_map_access,
0080                           &map_fd[i - 4])))
0081             goto close_prog;
0082     for (i = 0; i < 4; i++)
0083         if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
0084                    ret != (void *)&prog_fd))
0085             goto close_prog;
0086     for (i = 4; i < 6; i++)
0087         if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
0088                    ret != (void *)&map_fd[i - 4]))
0089             goto close_prog;
0090 close_prog:
0091     bpf_object__close(obj);
0092 }