summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/net/reuseport_bpf_numa.c
blob: c9ba36aa688e2520b4aaf3661db835ed2f8079a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
// SPDX-License-Identifier: GPL-2.0
/*
 * Test functionality of BPF filters with SO_REUSEPORT. Same test as
 * in reuseport_bpf_cpu, only as one socket per NUMA node.
 */

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <error.h>
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <linux/unistd.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <numa.h>

#include "../kselftest.h"

static const int PORT = 8888;

static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
{
	struct sockaddr_storage addr;
	struct sockaddr_in  *addr4;
	struct sockaddr_in6 *addr6;
	size_t i;
	int opt;

	switch (family) {
	case AF_INET:
		addr4 = (struct sockaddr_in *)&addr;
		addr4->sin_family = AF_INET;
		addr4->sin_addr.s_addr = htonl(INADDR_ANY);
		addr4->sin_port = htons(PORT);
		break;
	case AF_INET6:
		addr6 = (struct sockaddr_in6 *)&addr;
		addr6->sin6_family = AF_INET6;
		addr6->sin6_addr = in6addr_any;
		addr6->sin6_port = htons(PORT);
		break;
	default:
		error(1, 0, "Unsupported family %d", family);
	}

	for (i = 0; i < len; ++i) {
		rcv_fd[i] = socket(family, proto, 0);
		if (rcv_fd[i] < 0)
			error(1, errno, "failed to create receive socket");

		opt = 1;
		if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
			       sizeof(opt)))
			error(1, errno, "failed to set SO_REUSEPORT");

		if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
			error(1, errno, "failed to bind receive socket");

		if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
			error(1, errno, "failed to listen on receive port");
	}
}

static void attach_bpf(int fd)
{
	static char bpf_log_buf[65536];
	static const char bpf_license[] = "";

	int bpf_fd;
	const struct bpf_insn prog[] = {
		/* R0 = bpf_get_numa_node_id() */
		{ BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_numa_node_id },
		/* return R0 */
		{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
	};
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
	attr.insn_cnt = ARRAY_SIZE(prog);
	attr.insns = (unsigned long) &prog;
	attr.license = (unsigned long) &bpf_license;
	attr.log_buf = (unsigned long) &bpf_log_buf;
	attr.log_size = sizeof(bpf_log_buf);
	attr.log_level = 1;

	bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
	if (bpf_fd < 0)
		error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);

	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
			sizeof(bpf_fd)))
		error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");

	close(bpf_fd);
}

static void send_from_node(int node_id, int family, int proto)
{
	struct sockaddr_storage saddr, daddr;
	struct sockaddr_in  *saddr4, *daddr4;
	struct sockaddr_in6 *saddr6, *daddr6;
	int fd;

	switch (family) {
	case AF_INET:
		saddr4 = (struct sockaddr_in *)&saddr;
		saddr4->sin_family = AF_INET;
		saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
		saddr4->sin_port = 0;

		daddr4 = (struct sockaddr_in *)&daddr;
		daddr4->sin_family = AF_INET;
		daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
		daddr4->sin_port = htons(PORT);
		break;
	case AF_INET6:
		saddr6 = (struct sockaddr_in6 *)&saddr;
		saddr6->sin6_family = AF_INET6;
		saddr6->sin6_addr = in6addr_any;
		saddr6->sin6_port = 0;

		daddr6 = (struct sockaddr_in6 *)&daddr;
		daddr6->sin6_family = AF_INET6;
		daddr6->sin6_addr = in6addr_loopback;
		daddr6->sin6_port = htons(PORT);
		break;
	default:
		error(1, 0, "Unsupported family %d", family);
	}

	if (numa_run_on_node(node_id) < 0)
		error(1, errno, "failed to pin to node");

	fd = socket(family, proto, 0);
	if (fd < 0)
		error(1, errno, "failed to create send socket");

	if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
		error(1, errno, "failed to bind send socket");

	if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
		error(1, errno, "failed to connect send socket");

	if (send(fd, "a", 1, 0) < 0)
		error(1, errno, "failed to send message");

	close(fd);
}

static
void receive_on_node(int *rcv_fd, int len, int epfd, int node_id, int proto)
{
	struct epoll_event ev;
	int i, fd;
	char buf[8];

	i = epoll_wait(epfd, &ev, 1, -1);
	if (i < 0)
		error(1, errno, "epoll_wait failed");

	if (proto == SOCK_STREAM) {
		fd = accept(ev.data.fd, NULL, NULL);
		if (fd < 0)
			error(1, errno, "failed to accept");
		i = recv(fd, buf, sizeof(buf), 0);
		close(fd);
	} else {
		i = recv(ev.data.fd, buf, sizeof(buf), 0);
	}

	if (i < 0)
		error(1, errno, "failed to recv");

	for (i = 0; i < len; ++i)
		if (ev.data.fd == rcv_fd[i])
			break;
	if (i == len)
		error(1, 0, "failed to find socket");
	fprintf(stderr, "send node %d, receive socket %d\n", node_id, i);
	if (node_id != i)
		error(1, 0, "node id/receive socket mismatch");
}

static void test(int *rcv_fd, int len, int family, int proto)
{
	struct epoll_event ev;
	int epfd, node;

	build_rcv_group(rcv_fd, len, family, proto);
	attach_bpf(rcv_fd[0]);

	epfd = epoll_create(1);
	if (epfd < 0)
		error(1, errno, "failed to create epoll");
	for (node = 0; node < len; ++node) {
		ev.events = EPOLLIN;
		ev.data.fd = rcv_fd[node];
		if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[node], &ev))
			error(1, errno, "failed to register sock epoll");
	}

	/* Forward iterate */
	for (node = 0; node < len; ++node) {
		if (!numa_bitmask_isbitset(numa_nodes_ptr, node))
			continue;
		send_from_node(node, family, proto);
		receive_on_node(rcv_fd, len, epfd, node, proto);
	}

	/* Reverse iterate */
	for (node = len - 1; node >= 0; --node) {
		if (!numa_bitmask_isbitset(numa_nodes_ptr, node))
			continue;
		send_from_node(node, family, proto);
		receive_on_node(rcv_fd, len, epfd, node, proto);
	}

	close(epfd);
	for (node = 0; node < len; ++node)
		close(rcv_fd[node]);
}

int main(void)
{
	int *rcv_fd, nodes;

	if (numa_available() < 0)
		ksft_exit_skip("no numa api support\n");

	nodes = numa_max_node() + 1;

	rcv_fd = calloc(nodes, sizeof(int));
	if (!rcv_fd)
		error(1, 0, "failed to allocate array");

	fprintf(stderr, "---- IPv4 UDP ----\n");
	test(rcv_fd, nodes, AF_INET, SOCK_DGRAM);

	fprintf(stderr, "---- IPv6 UDP ----\n");
	test(rcv_fd, nodes, AF_INET6, SOCK_DGRAM);

	fprintf(stderr, "---- IPv4 TCP ----\n");
	test(rcv_fd, nodes, AF_INET, SOCK_STREAM);

	fprintf(stderr, "---- IPv6 TCP ----\n");
	test(rcv_fd, nodes, AF_INET6, SOCK_STREAM);

	free(rcv_fd);

	fprintf(stderr, "SUCCESS\n");
	return 0;
}