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}