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 	int err, prog_fd = *(u32 *) arg;
8 	LIBBPF_OPTS(bpf_test_run_opts, topts,
9 		.data_in = &pkt_v4,
10 		.data_size_in = sizeof(pkt_v4),
11 		.repeat = 10000,
12 	);
13 
14 	err = bpf_prog_test_run_opts(prog_fd, &topts);
15 	ASSERT_OK(err, "test_run_opts err");
16 	ASSERT_OK(topts.retval, "test_run_opts retval");
17 
18 	pthread_exit(arg);
19 }
20 
21 static void *parallel_map_access(void *arg)
22 {
23 	int err, map_fd = *(u32 *) arg;
24 	int vars[17], i, j, rnd, key = 0;
25 
26 	for (i = 0; i < 10000; i++) {
27 		err = bpf_map_lookup_elem_flags(map_fd, &key, vars, BPF_F_LOCK);
28 		if (CHECK_FAIL(err)) {
29 			printf("lookup failed\n");
30 			goto out;
31 		}
32 		if (CHECK_FAIL(vars[0] != 0)) {
33 			printf("lookup #%d var[0]=%d\n", i, vars[0]);
34 			goto out;
35 		}
36 		rnd = vars[1];
37 		for (j = 2; j < 17; j++) {
38 			if (vars[j] == rnd)
39 				continue;
40 			printf("lookup #%d var[1]=%d var[%d]=%d\n",
41 			       i, rnd, j, vars[j]);
42 			CHECK_FAIL(vars[j] != rnd);
43 			goto out;
44 		}
45 	}
46 out:
47 	pthread_exit(arg);
48 }
49 
50 void test_map_lock(void)
51 {
52 	const char *file = "./test_map_lock.bpf.o";
53 	int prog_fd, map_fd[2], vars[17] = {};
54 	pthread_t thread_id[6];
55 	struct bpf_object *obj = NULL;
56 	int err = 0, key = 0, i;
57 	void *ret;
58 
59 	err = bpf_prog_test_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
60 	if (CHECK_FAIL(err)) {
61 		printf("test_map_lock:bpf_prog_test_load errno %d\n", errno);
62 		goto close_prog;
63 	}
64 	map_fd[0] = bpf_find_map(__func__, obj, "hash_map");
65 	if (CHECK_FAIL(map_fd[0] < 0))
66 		goto close_prog;
67 	map_fd[1] = bpf_find_map(__func__, obj, "array_map");
68 	if (CHECK_FAIL(map_fd[1] < 0))
69 		goto close_prog;
70 
71 	bpf_map_update_elem(map_fd[0], &key, vars, BPF_F_LOCK);
72 
73 	for (i = 0; i < 4; i++)
74 		if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
75 					      &spin_lock_thread, &prog_fd)))
76 			goto close_prog;
77 	for (i = 4; i < 6; i++)
78 		if (CHECK_FAIL(pthread_create(&thread_id[i], NULL,
79 					      &parallel_map_access,
80 					      &map_fd[i - 4])))
81 			goto close_prog;
82 	for (i = 0; i < 4; i++)
83 		if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
84 			       ret != (void *)&prog_fd))
85 			goto close_prog;
86 	for (i = 4; i < 6; i++)
87 		if (CHECK_FAIL(pthread_join(thread_id[i], &ret) ||
88 			       ret != (void *)&map_fd[i - 4]))
89 			goto close_prog;
90 close_prog:
91 	bpf_object__close(obj);
92 }
93