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-rw-r--r--tools/testing/selftests/net/psock_fanout.c312
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diff --git a/tools/testing/selftests/net/psock_fanout.c b/tools/testing/selftests/net/psock_fanout.c
new file mode 100644
index 000000000000..57b9c2b7c4ff
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+++ b/tools/testing/selftests/net/psock_fanout.c
@@ -0,0 +1,312 @@
1/*
2 * Copyright 2013 Google Inc.
3 * Author: Willem de Bruijn (willemb@google.com)
4 *
5 * A basic test of packet socket fanout behavior.
6 *
7 * Control:
8 * - create fanout fails as expected with illegal flag combinations
9 * - join fanout fails as expected with diverging types or flags
10 *
11 * Datapath:
12 * Open a pair of packet sockets and a pair of INET sockets, send a known
13 * number of packets across the two INET sockets and count the number of
14 * packets enqueued onto the two packet sockets.
15 *
16 * The test currently runs for
17 * - PACKET_FANOUT_HASH
18 * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
19 * - PACKET_FANOUT_LB
20 * - PACKET_FANOUT_CPU
21 * - PACKET_FANOUT_ROLLOVER
22 *
23 * Todo:
24 * - functionality: PACKET_FANOUT_FLAG_DEFRAG
25 *
26 * License (GPLv2):
27 *
28 * This program is free software; you can redistribute it and/or modify it
29 * under the terms and conditions of the GNU General Public License,
30 * version 2, as published by the Free Software Foundation.
31 *
32 * This program is distributed in the hope it will be useful, but WITHOUT
33 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
34 * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
35 * more details.
36 *
37 * You should have received a copy of the GNU General Public License along with
38 * this program; if not, write to the Free Software Foundation, Inc.,
39 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
40 */
41
42#define _GNU_SOURCE /* for sched_setaffinity */
43
44#include <arpa/inet.h>
45#include <errno.h>
46#include <fcntl.h>
47#include <linux/filter.h>
48#include <linux/if_packet.h>
49#include <net/ethernet.h>
50#include <netinet/ip.h>
51#include <netinet/udp.h>
52#include <poll.h>
53#include <sched.h>
54#include <stdint.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <sys/mman.h>
59#include <sys/socket.h>
60#include <sys/stat.h>
61#include <sys/types.h>
62#include <unistd.h>
63
64#include "psock_lib.h"
65
66#define RING_NUM_FRAMES 20
67
68/* Open a socket in a given fanout mode.
69 * @return -1 if mode is bad, a valid socket otherwise */
70static int sock_fanout_open(uint16_t typeflags, int num_packets)
71{
72 int fd, val;
73
74 fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
75 if (fd < 0) {
76 perror("socket packet");
77 exit(1);
78 }
79
80 /* fanout group ID is always 0: tests whether old groups are deleted */
81 val = ((int) typeflags) << 16;
82 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
83 if (close(fd)) {
84 perror("close packet");
85 exit(1);
86 }
87 return -1;
88 }
89
90 pair_udp_setfilter(fd);
91 return fd;
92}
93
94static char *sock_fanout_open_ring(int fd)
95{
96 struct tpacket_req req = {
97 .tp_block_size = getpagesize(),
98 .tp_frame_size = getpagesize(),
99 .tp_block_nr = RING_NUM_FRAMES,
100 .tp_frame_nr = RING_NUM_FRAMES,
101 };
102 char *ring;
103 int val = TPACKET_V2;
104
105 if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
106 sizeof(val))) {
107 perror("packetsock ring setsockopt version");
108 exit(1);
109 }
110 if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
111 sizeof(req))) {
112 perror("packetsock ring setsockopt");
113 exit(1);
114 }
115
116 ring = mmap(0, req.tp_block_size * req.tp_block_nr,
117 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
118 if (!ring) {
119 fprintf(stderr, "packetsock ring mmap\n");
120 exit(1);
121 }
122
123 return ring;
124}
125
126static int sock_fanout_read_ring(int fd, void *ring)
127{
128 struct tpacket2_hdr *header = ring;
129 int count = 0;
130
131 while (header->tp_status & TP_STATUS_USER && count < RING_NUM_FRAMES) {
132 count++;
133 header = ring + (count * getpagesize());
134 }
135
136 return count;
137}
138
139static int sock_fanout_read(int fds[], char *rings[], const int expect[])
140{
141 int ret[2];
142
143 ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
144 ret[1] = sock_fanout_read_ring(fds[1], rings[1]);
145
146 fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
147 ret[0], ret[1], expect[0], expect[1]);
148
149 if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
150 (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
151 fprintf(stderr, "ERROR: incorrect queue lengths\n");
152 return 1;
153 }
154
155 return 0;
156}
157
158/* Test illegal mode + flag combination */
159static void test_control_single(void)
160{
161 fprintf(stderr, "test: control single socket\n");
162
163 if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
164 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
165 fprintf(stderr, "ERROR: opened socket with dual rollover\n");
166 exit(1);
167 }
168}
169
170/* Test illegal group with different modes or flags */
171static void test_control_group(void)
172{
173 int fds[2];
174
175 fprintf(stderr, "test: control multiple sockets\n");
176
177 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
178 if (fds[0] == -1) {
179 fprintf(stderr, "ERROR: failed to open HASH socket\n");
180 exit(1);
181 }
182 if (sock_fanout_open(PACKET_FANOUT_HASH |
183 PACKET_FANOUT_FLAG_DEFRAG, 10) != -1) {
184 fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
185 exit(1);
186 }
187 if (sock_fanout_open(PACKET_FANOUT_HASH |
188 PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) {
189 fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
190 exit(1);
191 }
192 if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) {
193 fprintf(stderr, "ERROR: joined group with wrong mode\n");
194 exit(1);
195 }
196 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
197 if (fds[1] == -1) {
198 fprintf(stderr, "ERROR: failed to join group\n");
199 exit(1);
200 }
201 if (close(fds[1]) || close(fds[0])) {
202 fprintf(stderr, "ERROR: closing sockets\n");
203 exit(1);
204 }
205}
206
207static int test_datapath(uint16_t typeflags, int port_off,
208 const int expect1[], const int expect2[])
209{
210 const int expect0[] = { 0, 0 };
211 char *rings[2];
212 int fds[2], fds_udp[2][2], ret;
213
214 fprintf(stderr, "test: datapath 0x%hx\n", typeflags);
215
216 fds[0] = sock_fanout_open(typeflags, 20);
217 fds[1] = sock_fanout_open(typeflags, 20);
218 if (fds[0] == -1 || fds[1] == -1) {
219 fprintf(stderr, "ERROR: failed open\n");
220 exit(1);
221 }
222 rings[0] = sock_fanout_open_ring(fds[0]);
223 rings[1] = sock_fanout_open_ring(fds[1]);
224 pair_udp_open(fds_udp[0], PORT_BASE);
225 pair_udp_open(fds_udp[1], PORT_BASE + port_off);
226 sock_fanout_read(fds, rings, expect0);
227
228 /* Send data, but not enough to overflow a queue */
229 pair_udp_send(fds_udp[0], 15);
230 pair_udp_send(fds_udp[1], 5);
231 ret = sock_fanout_read(fds, rings, expect1);
232
233 /* Send more data, overflow the queue */
234 pair_udp_send(fds_udp[0], 15);
235 /* TODO: ensure consistent order between expect1 and expect2 */
236 ret |= sock_fanout_read(fds, rings, expect2);
237
238 if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
239 munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
240 fprintf(stderr, "close rings\n");
241 exit(1);
242 }
243 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
244 close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
245 close(fds[1]) || close(fds[0])) {
246 fprintf(stderr, "close datapath\n");
247 exit(1);
248 }
249
250 return ret;
251}
252
253static int set_cpuaffinity(int cpuid)
254{
255 cpu_set_t mask;
256
257 CPU_ZERO(&mask);
258 CPU_SET(cpuid, &mask);
259 if (sched_setaffinity(0, sizeof(mask), &mask)) {
260 if (errno != EINVAL) {
261 fprintf(stderr, "setaffinity %d\n", cpuid);
262 exit(1);
263 }
264 return 1;
265 }
266
267 return 0;
268}
269
270int main(int argc, char **argv)
271{
272 const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } };
273 const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } };
274 const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } };
275 const int expect_rb[2][2] = { { 20, 0 }, { 20, 15 } };
276 const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } };
277 const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } };
278 int port_off = 2, tries = 5, ret;
279
280 test_control_single();
281 test_control_group();
282
283 /* find a set of ports that do not collide onto the same socket */
284 ret = test_datapath(PACKET_FANOUT_HASH, port_off,
285 expect_hash[0], expect_hash[1]);
286 while (ret && tries--) {
287 fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
288 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
289 expect_hash[0], expect_hash[1]);
290 }
291
292 ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
293 port_off, expect_hash_rb[0], expect_hash_rb[1]);
294 ret |= test_datapath(PACKET_FANOUT_LB,
295 port_off, expect_lb[0], expect_lb[1]);
296 ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
297 port_off, expect_rb[0], expect_rb[1]);
298
299 set_cpuaffinity(0);
300 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
301 expect_cpu0[0], expect_cpu0[1]);
302 if (!set_cpuaffinity(1))
303 /* TODO: test that choice alternates with previous */
304 ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
305 expect_cpu1[0], expect_cpu1[1]);
306
307 if (ret)
308 return 1;
309
310 printf("OK. All tests passed\n");
311 return 0;
312}
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