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
10 struct thread_ctx {
11 pthread_barrier_t barrier;
12 int outer_map_fd;
13 int start, abort;
14 int loop, err;
15 };
16
17 static 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
24 static 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
55 static 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
73 static 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");
126 out:
127 access_map_in_map__destroy(skel);
128 }
129
130 void 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
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