1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * This times how long it takes to bind to a port when the port already
4 * has multiple sockets in its bhash table.
5 *
6 * In the setup(), we populate the port's bhash table with
7 * MAX_THREADS * MAX_CONNECTIONS number of entries.
8 */
9
10 #include <unistd.h>
11 #include <stdio.h>
12 #include <netdb.h>
13 #include <pthread.h>
14 #include <string.h>
15 #include <stdbool.h>
16
17 #define MAX_THREADS 600
18 #define MAX_CONNECTIONS 40
19
20 static const char *setup_addr_v6 = "::1";
21 static const char *setup_addr_v4 = "127.0.0.1";
22 static const char *setup_addr;
23 static const char *bind_addr;
24 static const char *port;
25 bool use_v6;
26 int ret;
27
28 static int fd_array[MAX_THREADS][MAX_CONNECTIONS];
29
30 static int bind_socket(int opt, const char *addr)
31 {
32 struct addrinfo *res, hint = {};
33 int sock_fd, reuse = 1, err;
34 int domain = use_v6 ? AF_INET6 : AF_INET;
35
36 sock_fd = socket(domain, SOCK_STREAM, 0);
37 if (sock_fd < 0) {
38 perror("socket fd err");
39 return sock_fd;
40 }
41
42 hint.ai_family = domain;
43 hint.ai_socktype = SOCK_STREAM;
44
45 err = getaddrinfo(addr, port, &hint, &res);
46 if (err) {
47 perror("getaddrinfo failed");
48 goto cleanup;
49 }
50
51 if (opt) {
52 err = setsockopt(sock_fd, SOL_SOCKET, opt, &reuse, sizeof(reuse));
53 if (err) {
54 perror("setsockopt failed");
55 goto cleanup;
56 }
57 }
58
59 err = bind(sock_fd, res->ai_addr, res->ai_addrlen);
60 if (err) {
61 perror("failed to bind to port");
62 goto cleanup;
63 }
64
65 return sock_fd;
66
67 cleanup:
68 close(sock_fd);
69 return err;
70 }
71
72 static void *setup(void *arg)
73 {
74 int sock_fd, i;
75 int *array = (int *)arg;
76
77 for (i = 0; i < MAX_CONNECTIONS; i++) {
78 sock_fd = bind_socket(SO_REUSEADDR | SO_REUSEPORT, setup_addr);
79 if (sock_fd < 0) {
80 ret = sock_fd;
81 pthread_exit(&ret);
82 }
83 array[i] = sock_fd;
84 }
85
86 return NULL;
87 }
88
89 int main(int argc, const char *argv[])
90 {
91 int listener_fd, sock_fd, i, j;
92 pthread_t tid[MAX_THREADS];
93 clock_t begin, end;
94
95 if (argc != 4) {
96 printf("Usage: listener <port> <ipv6 | ipv4> <bind-addr>\n");
97 return -1;
98 }
99
100 port = argv[1];
101 use_v6 = strcmp(argv[2], "ipv6") == 0;
102 bind_addr = argv[3];
103
104 setup_addr = use_v6 ? setup_addr_v6 : setup_addr_v4;
105
106 listener_fd = bind_socket(SO_REUSEADDR | SO_REUSEPORT, setup_addr);
107 if (listen(listener_fd, 100) < 0) {
108 perror("listen failed");
109 return -1;
110 }
111
112 /* Set up threads to populate the bhash table entry for the port */
113 for (i = 0; i < MAX_THREADS; i++)
114 pthread_create(&tid[i], NULL, setup, fd_array[i]);
115
116 for (i = 0; i < MAX_THREADS; i++)
117 pthread_join(tid[i], NULL);
118
119 if (ret)
120 goto done;
121
122 begin = clock();
123
124 /* Bind to the same port on a different address */
125 sock_fd = bind_socket(0, bind_addr);
126 if (sock_fd < 0)
127 goto done;
128
129 end = clock();
130
131 printf("time spent = %f\n", (double)(end - begin) / CLOCKS_PER_SEC);
132
133 /* clean up */
134 close(sock_fd);
135
136 done:
137 close(listener_fd);
138 for (i = 0; i < MAX_THREADS; i++) {
139 for (j = 0; i < MAX_THREADS; i++)
140 close(fd_array[i][j]);
141 }
142
143 return 0;
144 }
145
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