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