1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2023. Huawei Technologies Co., Ltd */
3#define _GNU_SOURCE
4#include <unistd.h>
5#include <sys/syscall.h>
6#include <test_progs.h>
7#include <bpf/btf.h>
8#include "access_map_in_map.skel.h"
9
10struct thread_ctx {
11	pthread_barrier_t barrier;
12	int outer_map_fd;
13	int start, abort;
14	int loop, err;
15};
16
17static int wait_for_start_or_abort(struct thread_ctx *ctx)
18{
19	while (!ctx->start && !ctx->abort)
20		usleep(1);
21	return ctx->abort ? -1 : 0;
22}
23
24static void *update_map_fn(void *data)
25{
26	struct thread_ctx *ctx = data;
27	int loop = ctx->loop, err = 0;
28
29	if (wait_for_start_or_abort(ctx) < 0)
30		return NULL;
31	pthread_barrier_wait(&ctx->barrier);
32
33	while (loop-- > 0) {
34		int fd, zero = 0;
35
36		fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);
37		if (fd < 0) {
38			err |= 1;
39			pthread_barrier_wait(&ctx->barrier);
40			continue;
41		}
42
43		/* Remove the old inner map */
44		if (bpf_map_update_elem(ctx->outer_map_fd, &zero, &fd, 0) < 0)
45			err |= 2;
46		close(fd);
47		pthread_barrier_wait(&ctx->barrier);
48	}
49
50	ctx->err = err;
51
52	return NULL;
53}
54
55static void *access_map_fn(void *data)
56{
57	struct thread_ctx *ctx = data;
58	int loop = ctx->loop;
59
60	if (wait_for_start_or_abort(ctx) < 0)
61		return NULL;
62	pthread_barrier_wait(&ctx->barrier);
63
64	while (loop-- > 0) {
65		/* Access the old inner map */
66		syscall(SYS_getpgid);
67		pthread_barrier_wait(&ctx->barrier);
68	}
69
70	return NULL;
71}
72
73static void test_map_in_map_access(const char *prog_name, const char *map_name)
74{
75	struct access_map_in_map *skel;
76	struct bpf_map *outer_map;
77	struct bpf_program *prog;
78	struct thread_ctx ctx;
79	pthread_t tid[2];
80	int err;
81
82	skel = access_map_in_map__open();
83	if (!ASSERT_OK_PTR(skel, "access_map_in_map open"))
84		return;
85
86	prog = bpf_object__find_program_by_name(skel->obj, prog_name);
87	if (!ASSERT_OK_PTR(prog, "find program"))
88		goto out;
89	bpf_program__set_autoload(prog, true);
90
91	outer_map = bpf_object__find_map_by_name(skel->obj, map_name);
92	if (!ASSERT_OK_PTR(outer_map, "find map"))
93		goto out;
94
95	err = access_map_in_map__load(skel);
96	if (!ASSERT_OK(err, "access_map_in_map load"))
97		goto out;
98
99	err = access_map_in_map__attach(skel);
100	if (!ASSERT_OK(err, "access_map_in_map attach"))
101		goto out;
102
103	skel->bss->tgid = getpid();
104
105	memset(&ctx, 0, sizeof(ctx));
106	pthread_barrier_init(&ctx.barrier, NULL, 2);
107	ctx.outer_map_fd = bpf_map__fd(outer_map);
108	ctx.loop = 4;
109
110	err = pthread_create(&tid[0], NULL, update_map_fn, &ctx);
111	if (!ASSERT_OK(err, "close_thread"))
112		goto out;
113
114	err = pthread_create(&tid[1], NULL, access_map_fn, &ctx);
115	if (!ASSERT_OK(err, "read_thread")) {
116		ctx.abort = 1;
117		pthread_join(tid[0], NULL);
118		goto out;
119	}
120
121	ctx.start = 1;
122	pthread_join(tid[0], NULL);
123	pthread_join(tid[1], NULL);
124
125	ASSERT_OK(ctx.err, "err");
126out:
127	access_map_in_map__destroy(skel);
128}
129
130void test_map_in_map(void)
131{
132	if (test__start_subtest("acc_map_in_array"))
133		test_map_in_map_access("access_map_in_array", "outer_array_map");
134	if (test__start_subtest("sleepable_acc_map_in_array"))
135		test_map_in_map_access("sleepable_access_map_in_array", "outer_array_map");
136	if (test__start_subtest("acc_map_in_htab"))
137		test_map_in_map_access("access_map_in_htab", "outer_htab_map");
138	if (test__start_subtest("sleepable_acc_map_in_htab"))
139		test_map_in_map_access("sleepable_access_map_in_htab", "outer_htab_map");
140}
141
142