aboutsummaryrefslogtreecommitdiff
path: root/tools/testing/selftests/net/psock_fanout.c
blob: 57b9c2b7c4ffbfb5950af351f9157e97a075caac (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
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
/*
 * Copyright 2013 Google Inc.
 * Author: Willem de Bruijn (willemb@google.com)
 *
 * A basic test of packet socket fanout behavior.
 *
 * Control:
 * - create fanout fails as expected with illegal flag combinations
 * - join   fanout fails as expected with diverging types or flags
 *
 * Datapath:
 *   Open a pair of packet sockets and a pair of INET sockets, send a known
 *   number of packets across the two INET sockets and count the number of
 *   packets enqueued onto the two packet sockets.
 *
 *   The test currently runs for
 *   - PACKET_FANOUT_HASH
 *   - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
 *   - PACKET_FANOUT_LB
 *   - PACKET_FANOUT_CPU
 *   - PACKET_FANOUT_ROLLOVER
 *
 * Todo:
 * - functionality: PACKET_FANOUT_FLAG_DEFRAG
 *
 * License (GPLv2):
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define _GNU_SOURCE		/* for sched_setaffinity */

#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/filter.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <poll.h>
#include <sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "psock_lib.h"

#define RING_NUM_FRAMES			20

/* Open a socket in a given fanout mode.
 * @return -1 if mode is bad, a valid socket otherwise */
static int sock_fanout_open(uint16_t typeflags, int num_packets)
{
	int fd, val;

	fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
	if (fd < 0) {
		perror("socket packet");
		exit(1);
	}

	/* fanout group ID is always 0: tests whether old groups are deleted */
	val = ((int) typeflags) << 16;
	if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
		if (close(fd)) {
			perror("close packet");
			exit(1);
		}
		return -1;
	}

	pair_udp_setfilter(fd);
	return fd;
}

static char *sock_fanout_open_ring(int fd)
{
	struct tpacket_req req = {
		.tp_block_size = getpagesize(),
		.tp_frame_size = getpagesize(),
		.tp_block_nr   = RING_NUM_FRAMES,
		.tp_frame_nr   = RING_NUM_FRAMES,
	};
	char *ring;
	int val = TPACKET_V2;

	if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
		       sizeof(val))) {
		perror("packetsock ring setsockopt version");
		exit(1);
	}
	if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
		       sizeof(req))) {
		perror("packetsock ring setsockopt");
		exit(1);
	}

	ring = mmap(0, req.tp_block_size * req.tp_block_nr,
		    PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (!ring) {
		fprintf(stderr, "packetsock ring mmap\n");
		exit(1);
	}

	return ring;
}

static int sock_fanout_read_ring(int fd, void *ring)
{
	struct tpacket2_hdr *header = ring;
	int count = 0;

	while (header->tp_status & TP_STATUS_USER && count < RING_NUM_FRAMES) {
		count++;
		header = ring + (count * getpagesize());
	}

	return count;
}

static int sock_fanout_read(int fds[], char *rings[], const int expect[])
{
	int ret[2];

	ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
	ret[1] = sock_fanout_read_ring(fds[1], rings[1]);

	fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
			ret[0], ret[1], expect[0], expect[1]);

	if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
	    (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
		fprintf(stderr, "ERROR: incorrect queue lengths\n");
		return 1;
	}

	return 0;
}

/* Test illegal mode + flag combination */
static void test_control_single(void)
{
	fprintf(stderr, "test: control single socket\n");

	if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
			       PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
		fprintf(stderr, "ERROR: opened socket with dual rollover\n");
		exit(1);
	}
}

/* Test illegal group with different modes or flags */
static void test_control_group(void)
{
	int fds[2];

	fprintf(stderr, "test: control multiple sockets\n");

	fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
	if (fds[0] == -1) {
		fprintf(stderr, "ERROR: failed to open HASH socket\n");
		exit(1);
	}
	if (sock_fanout_open(PACKET_FANOUT_HASH |
			       PACKET_FANOUT_FLAG_DEFRAG, 10) != -1) {
		fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
		exit(1);
	}
	if (sock_fanout_open(PACKET_FANOUT_HASH |
			       PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) {
		fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
		exit(1);
	}
	if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) {
		fprintf(stderr, "ERROR: joined group with wrong mode\n");
		exit(1);
	}
	fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
	if (fds[1] == -1) {
		fprintf(stderr, "ERROR: failed to join group\n");
		exit(1);
	}
	if (close(fds[1]) || close(fds[0])) {
		fprintf(stderr, "ERROR: closing sockets\n");
		exit(1);
	}
}

static int test_datapath(uint16_t typeflags, int port_off,
			 const int expect1[], const int expect2[])
{
	const int expect0[] = { 0, 0 };
	char *rings[2];
	int fds[2], fds_udp[2][2], ret;

	fprintf(stderr, "test: datapath 0x%hx\n", typeflags);

	fds[0] = sock_fanout_open(typeflags, 20);
	fds[1] = sock_fanout_open(typeflags, 20);
	if (fds[0] == -1 || fds[1] == -1) {
		fprintf(stderr, "ERROR: failed open\n");
		exit(1);
	}
	rings[0] = sock_fanout_open_ring(fds[0]);
	rings[1] = sock_fanout_open_ring(fds[1]);
	pair_udp_open(fds_udp[0], PORT_BASE);
	pair_udp_open(fds_udp[1], PORT_BASE + port_off);
	sock_fanout_read(fds, rings, expect0);

	/* Send data, but not enough to overflow a queue */
	pair_udp_send(fds_udp[0], 15);
	pair_udp_send(fds_udp[1], 5);
	ret = sock_fanout_read(fds, rings, expect1);

	/* Send more data, overflow the queue */
	pair_udp_send(fds_udp[0], 15);
	/* TODO: ensure consistent order between expect1 and expect2 */
	ret |= sock_fanout_read(fds, rings, expect2);

	if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
	    munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
		fprintf(stderr, "close rings\n");
		exit(1);
	}
	if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
	    close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
	    close(fds[1]) || close(fds[0])) {
		fprintf(stderr, "close datapath\n");
		exit(1);
	}

	return ret;
}

static int set_cpuaffinity(int cpuid)
{
	cpu_set_t mask;

	CPU_ZERO(&mask);
	CPU_SET(cpuid, &mask);
	if (sched_setaffinity(0, sizeof(mask), &mask)) {
		if (errno != EINVAL) {
			fprintf(stderr, "setaffinity %d\n", cpuid);
			exit(1);
		}
		return 1;
	}

	return 0;
}

int main(int argc, char **argv)
{
	const int expect_hash[2][2]	= { { 15, 5 },  { 20, 5 } };
	const int expect_hash_rb[2][2]	= { { 15, 5 },  { 20, 15 } };
	const int expect_lb[2][2]	= { { 10, 10 }, { 18, 17 } };
	const int expect_rb[2][2]	= { { 20, 0 },  { 20, 15 } };
	const int expect_cpu0[2][2]	= { { 20, 0 },  { 20, 0 } };
	const int expect_cpu1[2][2]	= { { 0, 20 },  { 0, 20 } };
	int port_off = 2, tries = 5, ret;

	test_control_single();
	test_control_group();

	/* find a set of ports that do not collide onto the same socket */
	ret = test_datapath(PACKET_FANOUT_HASH, port_off,
			    expect_hash[0], expect_hash[1]);
	while (ret && tries--) {
		fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
		ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
				    expect_hash[0], expect_hash[1]);
	}

	ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
			     port_off, expect_hash_rb[0], expect_hash_rb[1]);
	ret |= test_datapath(PACKET_FANOUT_LB,
			     port_off, expect_lb[0], expect_lb[1]);
	ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
			     port_off, expect_rb[0], expect_rb[1]);

	set_cpuaffinity(0);
	ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
			     expect_cpu0[0], expect_cpu0[1]);
	if (!set_cpuaffinity(1))
		/* TODO: test that choice alternates with previous */
		ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
				     expect_cpu1[0], expect_cpu1[1]);

	if (ret)
		return 1;

	printf("OK. All tests passed\n");
	return 0;
}