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Linux/tools/testing/selftests/net/psock_fanout.c

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  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 */
 70 static 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 
 94 static 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 
126 static int sock_fanout_read_ring(int fd, void *ring)
127 {
128         struct tpacket2_hdr *header = ring;
129         int count = 0;
130 
131         while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
132                 count++;
133                 header = ring + (count * getpagesize());
134         }
135 
136         return count;
137 }
138 
139 static 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 */
159 static 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 */
171 static 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 
207 static 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 
253 static 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 
270 int 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 }
313 

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