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 ¶llel_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 } 90