examples/tep_termination/main.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2015 Intel Corporation
   3  */
   4
   5 #include <arpa/inet.h>
   6 #include <getopt.h>
   7 #include <linux/if_ether.h>
   8 #include <linux/if_vlan.h>
   9 #include <linux/virtio_net.h>
  10 #include <linux/virtio_ring.h>
  11 #include <signal.h>
  12 #include <stdint.h>
  13 #include <sys/eventfd.h>
  14 #include <sys/param.h>
  15 #include <unistd.h>
  16
  17 #include <rte_atomic.h>
  18 #include <rte_cycles.h>
  19 #include <rte_ethdev.h>
  20 #include <rte_log.h>
  21 #include <rte_string_fns.h>
  22 #include <rte_malloc.h>
  23 #include <rte_vhost.h>
  24 #include <rte_pause.h>
  25
  26 #include "main.h"
  27 #include "vxlan.h"
  28 #include "vxlan_setup.h"
  29
  30 /* the maximum number of external ports supported */
  31 #define MAX_SUP_PORTS 1
  32
  33 /**
  34  * Calculate the number of buffers needed per port
  35  */
  36 #define NUM_MBUFS_PER_PORT ((MAX_QUEUES * RTE_TEST_RX_DESC_DEFAULT) +\
  37                                 (nb_switching_cores * MAX_PKT_BURST) +\
  38                                 (nb_switching_cores * \
  39                                 RTE_TEST_TX_DESC_DEFAULT) +\
  40                                 (nb_switching_cores * MBUF_CACHE_SIZE))
  41
  42 #define MBUF_CACHE_SIZE 128
  43 #define MBUF_DATA_SIZE RTE_MBUF_DEFAULT_BUF_SIZE
  44
  45 #define MAX_PKT_BURST 32        /* Max burst size for RX/TX */
  46 #define BURST_TX_DRAIN_US 100   /* TX drain every ~100us */
  47
  48 /* Defines how long we wait between retries on RX */
  49 #define BURST_RX_WAIT_US 15
  50
  51 #define BURST_RX_RETRIES 4      /* Number of retries on RX. */
  52
  53 #define JUMBO_FRAME_MAX_SIZE    0x2600
  54
  55 /* State of virtio device. */
  56 #define DEVICE_MAC_LEARNING 0
  57 #define DEVICE_RX           1
  58 #define DEVICE_SAFE_REMOVE  2
  59
  60 /* Config_core_flag status definitions. */
  61 #define REQUEST_DEV_REMOVAL 1
  62 #define ACK_DEV_REMOVAL     0
  63
  64 /* Configurable number of RX/TX ring descriptors */
  65 #define RTE_TEST_RX_DESC_DEFAULT 1024
  66 #define RTE_TEST_TX_DESC_DEFAULT 512
  67
  68 /* Get first 4 bytes in mbuf headroom. */
  69 #define MBUF_HEADROOM_UINT32(mbuf) (*(uint32_t *)((uint8_t *)(mbuf) \
  70                 + sizeof(struct rte_mbuf)))
  71
  72 #define INVALID_PORT_ID 0xFFFF
  73
  74 /* Size of buffers used for snprintfs. */
  75 #define MAX_PRINT_BUFF 6072
  76
  77 /* Maximum character device basename size. */
  78 #define MAX_BASENAME_SZ 20
  79
  80 /* Maximum long option length for option parsing. */
  81 #define MAX_LONG_OPT_SZ 64
  82
  83 /* Used to compare MAC addresses. */
  84 #define MAC_ADDR_CMP 0xFFFFFFFFFFFFULL
  85
  86 #define CMD_LINE_OPT_NB_DEVICES "nb-devices"
  87 #define CMD_LINE_OPT_UDP_PORT "udp-port"
  88 #define CMD_LINE_OPT_TX_CHECKSUM "tx-checksum"
  89 #define CMD_LINE_OPT_TSO_SEGSZ "tso-segsz"
  90 #define CMD_LINE_OPT_FILTER_TYPE "filter-type"
  91 #define CMD_LINE_OPT_ENCAP "encap"
  92 #define CMD_LINE_OPT_DECAP "decap"
  93 #define CMD_LINE_OPT_RX_RETRY "rx-retry"
  94 #define CMD_LINE_OPT_RX_RETRY_DELAY "rx-retry-delay"
  95 #define CMD_LINE_OPT_RX_RETRY_NUM "rx-retry-num"
  96 #define CMD_LINE_OPT_STATS "stats"
  97 #define CMD_LINE_OPT_DEV_BASENAME "dev-basename"
  98
  99 /* mask of enabled ports */
 100 static uint32_t enabled_port_mask;
 101
 102 /*Number of switching cores enabled*/
 103 static uint32_t nb_switching_cores;
 104
 105 /* number of devices/queues to support*/
 106 uint16_t nb_devices = 2;
 107
 108 /* max ring descriptor, ixgbe, i40e, e1000 all are 4096. */
 109 #define MAX_RING_DESC 4096
 110
 111 struct vpool {
 112         struct rte_mempool *pool;
 113         struct rte_ring *ring;
 114         uint32_t buf_size;
 115 } vpool_array[MAX_QUEUES+MAX_QUEUES];
 116
 117 /* UDP tunneling port */
 118 uint16_t udp_port = 4789;
 119
 120 /* enable/disable inner TX checksum */
 121 uint8_t tx_checksum = 0;
 122
 123 /* TCP segment size */
 124 uint16_t tso_segsz = 0;
 125
 126 /* enable/disable decapsulation */
 127 uint8_t rx_decap = 1;
 128
 129 /* enable/disable encapsulation */
 130 uint8_t tx_encap = 1;
 131
 132 /* RX filter type for tunneling packet */
 133 uint8_t filter_idx = 1;
 134
 135 /* overlay packet operation */
 136 struct ol_switch_ops overlay_options = {
 137         .port_configure = vxlan_port_init,
 138         .tunnel_setup = vxlan_link,
 139         .tunnel_destroy = vxlan_unlink,
 140         .tx_handle = vxlan_tx_pkts,
 141         .rx_handle = vxlan_rx_pkts,
 142         .param_handle = NULL,
 143 };
 144
 145 /* Enable stats. */
 146 uint32_t enable_stats = 0;
 147 /* Enable retries on RX. */
 148 static uint32_t enable_retry = 1;
 149 /* Specify timeout (in useconds) between retries on RX. */
 150 static uint32_t burst_rx_delay_time = BURST_RX_WAIT_US;
 151 /* Specify the number of retries on RX. */
 152 static uint32_t burst_rx_retry_num = BURST_RX_RETRIES;
 153
 154 /* Character device basename. Can be set by user. */
 155 static char dev_basename[MAX_BASENAME_SZ] = "vhost-net";
 156
 157 static unsigned lcore_ids[RTE_MAX_LCORE];
 158 uint16_t ports[RTE_MAX_ETHPORTS];
 159
 160 static unsigned nb_ports; /**< The number of ports specified in command line */
 161
 162 /* ethernet addresses of ports */
 163 struct ether_addr ports_eth_addr[RTE_MAX_ETHPORTS];
 164
 165 /* heads for the main used and free linked lists for the data path. */
 166 static struct virtio_net_data_ll *ll_root_used;
 167 static struct virtio_net_data_ll *ll_root_free;
 168
 169 /**
 170  * Array of data core structures containing information on
 171  * individual core linked lists.
 172  */
 173 static struct lcore_info lcore_info[RTE_MAX_LCORE];
 174
 175 /* Used for queueing bursts of TX packets. */
 176 struct mbuf_table {
 177         unsigned len;
 178         unsigned txq_id;
 179         struct rte_mbuf *m_table[MAX_PKT_BURST];
 180 };
 181
 182 /* TX queue for each data core. */
 183 struct mbuf_table lcore_tx_queue[RTE_MAX_LCORE];
 184
 185 struct device_statistics dev_statistics[MAX_DEVICES];
 186
 187 /**
 188  * Set character device basename.
 189  */
 190 static int
 191 us_vhost_parse_basename(const char *q_arg)
 192 {
 193         /* parse number string */
 194         if (strlen(q_arg) >= MAX_BASENAME_SZ)
 195                 return -1;
 196         else
 197                 snprintf((char *)&dev_basename, MAX_BASENAME_SZ, "%s", q_arg);
 198
 199         return 0;
 200 }
 201
 202 /**
 203  * Parse the portmask provided at run time.
 204  */
 205 static int
 206 parse_portmask(const char *portmask)
 207 {
 208         char *end = NULL;
 209         unsigned long pm;
 210
 211         /* parse hexadecimal string */
 212         pm = strtoul(portmask, &end, 16);
 213         if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
 214                 return -1;
 215
 216         if (pm == 0)
 217                 return -1;
 218
 219         return pm;
 220 }
 221
 222 /**
 223  * Parse num options at run time.
 224  */
 225 static int
 226 parse_num_opt(const char *q_arg, uint32_t max_valid_value)
 227 {
 228         char *end = NULL;
 229         unsigned long num;
 230
 231         /* parse unsigned int string */
 232         num = strtoul(q_arg, &end, 10);
 233         if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
 234                 return -1;
 235
 236         if (num > max_valid_value)
 237                 return -1;
 238
 239         return num;
 240 }
 241
 242 /**
 243  * Display usage
 244  */
 245 static void
 246 tep_termination_usage(const char *prgname)
 247 {
 248         RTE_LOG(INFO, VHOST_CONFIG, "%s [EAL options] -- -p PORTMASK\n"
 249         "               --udp-port: UDP destination port for VXLAN packet\n"
 250         "               --nb-devices[1-64]: The number of virtIO device\n"
 251         "               --tx-checksum [0|1]: inner Tx checksum offload\n"
 252         "               --tso-segsz [0-N]: TCP segment size\n"
 253         "               --decap [0|1]: tunneling packet decapsulation\n"
 254         "               --encap [0|1]: tunneling packet encapsulation\n"
 255         "               --filter-type[1-3]: filter type for tunneling packet\n"
 256         "                   1: Inner MAC and tenent ID\n"
 257         "                   2: Inner MAC and VLAN, and tenent ID\n"
 258         "                   3: Outer MAC, Inner MAC and tenent ID\n"
 259         "               -p PORTMASK: Set mask for ports to be used by application\n"
 260         "               --rx-retry [0|1]: disable/enable(default) retries on rx."
 261         "                Enable retry if destintation queue is full\n"
 262         "               --rx-retry-delay [0-N]: timeout(in usecond) between retries on RX."
 263         "                This makes effect only if retries on rx enabled\n"
 264         "               --rx-retry-num [0-N]: the number of retries on rx."
 265         "                This makes effect only if retries on rx enabled\n"
 266         "               --stats [0-N]: 0: Disable stats, N: Time in seconds to print stats\n"
 267         "               --dev-basename: The basename to be used for the character device.\n",
 268                prgname);
 269 }
 270
 271 /**
 272  * Parse the arguments given in the command line of the application.
 273  */
 274 static int
 275 tep_termination_parse_args(int argc, char **argv)
 276 {
 277         int opt, ret;
 278         int option_index;
 279         unsigned i;
 280         const char *prgname = argv[0];
 281         static struct option long_option[] = {
 282                 {CMD_LINE_OPT_NB_DEVICES, required_argument, NULL, 0},
 283                 {CMD_LINE_OPT_UDP_PORT, required_argument, NULL, 0},
 284                 {CMD_LINE_OPT_TX_CHECKSUM, required_argument, NULL, 0},
 285                 {CMD_LINE_OPT_TSO_SEGSZ, required_argument, NULL, 0},
 286                 {CMD_LINE_OPT_DECAP, required_argument, NULL, 0},
 287                 {CMD_LINE_OPT_ENCAP, required_argument, NULL, 0},
 288                 {CMD_LINE_OPT_FILTER_TYPE, required_argument, NULL, 0},
 289                 {CMD_LINE_OPT_RX_RETRY, required_argument, NULL, 0},
 290                 {CMD_LINE_OPT_RX_RETRY_DELAY, required_argument, NULL, 0},
 291                 {CMD_LINE_OPT_RX_RETRY_NUM, required_argument, NULL, 0},
 292                 {CMD_LINE_OPT_STATS, required_argument, NULL, 0},
 293                 {CMD_LINE_OPT_DEV_BASENAME, required_argument, NULL, 0},
 294                 {NULL, 0, 0, 0},
 295         };
 296
 297         /* Parse command line */
 298         while ((opt = getopt_long(argc, argv, "p:",
 299                         long_option, &option_index)) != EOF) {
 300                 switch (opt) {
 301                 /* Portmask */
 302                 case 'p':
 303                         enabled_port_mask = parse_portmask(optarg);
 304                         if (enabled_port_mask == 0) {
 305                                 RTE_LOG(INFO, VHOST_CONFIG,
 306                                         "Invalid portmask\n");
 307                                 tep_termination_usage(prgname);
 308                                 return -1;
 309                         }
 310                         break;
 311                 case 0:
 312                         if (!strncmp(long_option[option_index].name,
 313                                 CMD_LINE_OPT_NB_DEVICES,
 314                                 sizeof(CMD_LINE_OPT_NB_DEVICES))) {
 315                                 ret = parse_num_opt(optarg, MAX_DEVICES);
 316                                 if (ret == -1) {
 317                                         RTE_LOG(INFO, VHOST_CONFIG,
 318                                         "Invalid argument for nb-devices [0-%d]\n",
 319                                         MAX_DEVICES);
 320                                         tep_termination_usage(prgname);
 321                                         return -1;
 322                                 } else
 323                                         nb_devices = ret;
 324                         }
 325
 326                         /* Enable/disable retries on RX. */
 327                         if (!strncmp(long_option[option_index].name,
 328                                 CMD_LINE_OPT_RX_RETRY,
 329                                 sizeof(CMD_LINE_OPT_RX_RETRY))) {
 330                                 ret = parse_num_opt(optarg, 1);
 331                                 if (ret == -1) {
 332                                         RTE_LOG(INFO, VHOST_CONFIG,
 333                                                 "Invalid argument for rx-retry [0|1]\n");
 334                                         tep_termination_usage(prgname);
 335                                         return -1;
 336                                 } else
 337                                         enable_retry = ret;
 338                         }
 339
 340                         if (!strncmp(long_option[option_index].name,
 341                                 CMD_LINE_OPT_TSO_SEGSZ,
 342                                 sizeof(CMD_LINE_OPT_TSO_SEGSZ))) {
 343                                 ret = parse_num_opt(optarg, INT16_MAX);
 344                                 if (ret == -1) {
 345                                         RTE_LOG(INFO, VHOST_CONFIG,
 346                                                 "Invalid argument for TCP segment size [0-N]\n");
 347                                         tep_termination_usage(prgname);
 348                                         return -1;
 349                                 } else
 350                                         tso_segsz = ret;
 351                         }
 352
 353                         if (!strncmp(long_option[option_index].name,
 354                                         CMD_LINE_OPT_UDP_PORT,
 355                                         sizeof(CMD_LINE_OPT_UDP_PORT))) {
 356                                 ret = parse_num_opt(optarg, INT16_MAX);
 357                                 if (ret == -1) {
 358                                         RTE_LOG(INFO, VHOST_CONFIG,
 359                                                 "Invalid argument for UDP port [0-N]\n");
 360                                         tep_termination_usage(prgname);
 361                                         return -1;
 362                                 } else
 363                                         udp_port = ret;
 364                         }
 365
 366                         /* Specify the retries delay time (in useconds) on RX.*/
 367                         if (!strncmp(long_option[option_index].name,
 368                                 CMD_LINE_OPT_RX_RETRY_DELAY,
 369                                 sizeof(CMD_LINE_OPT_RX_RETRY_DELAY))) {
 370                                 ret = parse_num_opt(optarg, INT32_MAX);
 371                                 if (ret == -1) {
 372                                         RTE_LOG(INFO, VHOST_CONFIG,
 373                                                 "Invalid argument for rx-retry-delay [0-N]\n");
 374                                         tep_termination_usage(prgname);
 375                                         return -1;
 376                                 } else
 377                                         burst_rx_delay_time = ret;
 378                         }
 379
 380                         /* Specify the retries number on RX. */
 381                         if (!strncmp(long_option[option_index].name,
 382                                 CMD_LINE_OPT_RX_RETRY_NUM,
 383                                 sizeof(CMD_LINE_OPT_RX_RETRY_NUM))) {
 384                                 ret = parse_num_opt(optarg, INT32_MAX);
 385                                 if (ret == -1) {
 386                                         RTE_LOG(INFO, VHOST_CONFIG,
 387                                                 "Invalid argument for rx-retry-num [0-N]\n");
 388                                         tep_termination_usage(prgname);
 389                                         return -1;
 390                                 } else
 391                                         burst_rx_retry_num = ret;
 392                         }
 393
 394                         if (!strncmp(long_option[option_index].name,
 395                                 CMD_LINE_OPT_TX_CHECKSUM,
 396                                 sizeof(CMD_LINE_OPT_TX_CHECKSUM))) {
 397                                 ret = parse_num_opt(optarg, 1);
 398                                 if (ret == -1) {
 399                                         RTE_LOG(INFO, VHOST_CONFIG,
 400                                                 "Invalid argument for tx-checksum [0|1]\n");
 401                                         tep_termination_usage(prgname);
 402                                         return -1;
 403                                 } else
 404                                         tx_checksum = ret;
 405                         }
 406
 407                         if (!strncmp(long_option[option_index].name,
 408                                         CMD_LINE_OPT_FILTER_TYPE,
 409                                         sizeof(CMD_LINE_OPT_FILTER_TYPE))) {
 410                                 ret = parse_num_opt(optarg, 3);
 411                                 if ((ret == -1) || (ret == 0)) {
 412                                         RTE_LOG(INFO, VHOST_CONFIG,
 413                                                 "Invalid argument for filter type [1-3]\n");
 414                                         tep_termination_usage(prgname);
 415                                         return -1;
 416                                 } else
 417                                         filter_idx = ret - 1;
 418                         }
 419
 420                         /* Enable/disable encapsulation on RX. */
 421                         if (!strncmp(long_option[option_index].name,
 422                                 CMD_LINE_OPT_DECAP,
 423                                 sizeof(CMD_LINE_OPT_DECAP))) {
 424                                 ret = parse_num_opt(optarg, 1);
 425                                 if (ret == -1) {
 426                                         RTE_LOG(INFO, VHOST_CONFIG,
 427                                                 "Invalid argument for decap [0|1]\n");
 428                                         tep_termination_usage(prgname);
 429                                         return -1;
 430                                 } else
 431                                         rx_decap = ret;
 432                         }
 433
 434                         /* Enable/disable encapsulation on TX. */
 435                         if (!strncmp(long_option[option_index].name,
 436                                 CMD_LINE_OPT_ENCAP,
 437                                 sizeof(CMD_LINE_OPT_ENCAP))) {
 438                                 ret = parse_num_opt(optarg, 1);
 439                                 if (ret == -1) {
 440                                         RTE_LOG(INFO, VHOST_CONFIG,
 441                                                 "Invalid argument for encap [0|1]\n");
 442                                         tep_termination_usage(prgname);
 443                                         return -1;
 444                                 } else
 445                                         tx_encap = ret;
 446                         }
 447
 448                         /* Enable/disable stats. */
 449                         if (!strncmp(long_option[option_index].name,
 450                                 CMD_LINE_OPT_STATS,
 451                                 sizeof(CMD_LINE_OPT_STATS))) {
 452                                 ret = parse_num_opt(optarg, INT32_MAX);
 453                                 if (ret == -1) {
 454                                         RTE_LOG(INFO, VHOST_CONFIG,
 455                                                         "Invalid argument for stats [0..N]\n");
 456                                         tep_termination_usage(prgname);
 457                                         return -1;
 458                                 } else
 459                                         enable_stats = ret;
 460                         }
 461
 462                         /* Set character device basename. */
 463                         if (!strncmp(long_option[option_index].name,
 464                                 CMD_LINE_OPT_DEV_BASENAME,
 465                                 sizeof(CMD_LINE_OPT_DEV_BASENAME))) {
 466                                 if (us_vhost_parse_basename(optarg) == -1) {
 467                                         RTE_LOG(INFO, VHOST_CONFIG,
 468                                                 "Invalid argument for character "
 469                                                 "device basename (Max %d characters)\n",
 470                                                 MAX_BASENAME_SZ);
 471                                         tep_termination_usage(prgname);
 472                                         return -1;
 473                                 }
 474                         }
 475
 476                         break;
 477
 478                         /* Invalid option - print options. */
 479                 default:
 480                         tep_termination_usage(prgname);
 481                         return -1;
 482                 }
 483         }
 484
 485         for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
 486                 if (enabled_port_mask & (1 << i))
 487                         ports[nb_ports++] = (uint8_t)i;
 488         }
 489
 490         if ((nb_ports ==  0) || (nb_ports > MAX_SUP_PORTS)) {
 491                 RTE_LOG(INFO, VHOST_PORT, "Current enabled port number is %u,"
 492                         "but only %u port can be enabled\n", nb_ports,
 493                         MAX_SUP_PORTS);
 494                 return -1;
 495         }
 496
 497         return 0;
 498 }
 499
 500 /**
 501  * Update the global var NB_PORTS and array PORTS
 502  * according to system ports number and return valid ports number
 503  */
 504 static unsigned
 505 check_ports_num(unsigned max_nb_ports)
 506 {
 507         unsigned valid_nb_ports = nb_ports;
 508         unsigned portid;
 509
 510         if (nb_ports > max_nb_ports) {
 511                 RTE_LOG(INFO, VHOST_PORT, "\nSpecified port number(%u) "
 512                         " exceeds total system port number(%u)\n",
 513                         nb_ports, max_nb_ports);
 514                 nb_ports = max_nb_ports;
 515         }
 516
 517         for (portid = 0; portid < nb_ports; portid++) {
 518                 if (ports[portid] >= max_nb_ports) {
 519                         RTE_LOG(INFO, VHOST_PORT,
 520                                 "\nSpecified port ID(%u) exceeds max "
 521                                 " system port ID(%u)\n",
 522                                 ports[portid], (max_nb_ports - 1));
 523                         ports[portid] = INVALID_PORT_ID;
 524                         valid_nb_ports--;
 525                 }
 526         }
 527         return valid_nb_ports;
 528 }
 529
 530 /**
 531  * This function routes the TX packet to the correct interface. This may be a local device
 532  * or the physical port.
 533  */
 534 static __rte_always_inline void
 535 virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m)
 536 {
 537         struct mbuf_table *tx_q;
 538         struct rte_mbuf **m_table;
 539         unsigned len, ret = 0;
 540         const uint16_t lcore_id = rte_lcore_id();
 541
 542         RTE_LOG_DP(DEBUG, VHOST_DATA, "(%d) TX: MAC address is external\n",
 543                 vdev->vid);
 544
 545         /* Add packet to the port tx queue */
 546         tx_q = &lcore_tx_queue[lcore_id];
 547         len = tx_q->len;
 548
 549         tx_q->m_table[len] = m;
 550         len++;
 551         if (enable_stats) {
 552                 dev_statistics[vdev->vid].tx_total++;
 553                 dev_statistics[vdev->vid].tx++;
 554         }
 555
 556         if (unlikely(len == MAX_PKT_BURST)) {
 557                 m_table = (struct rte_mbuf **)tx_q->m_table;
 558                 ret = overlay_options.tx_handle(ports[0],
 559                         (uint16_t)tx_q->txq_id, m_table,
 560                         (uint16_t)tx_q->len);
 561
 562                 /* Free any buffers not handled by TX and update
 563                  * the port stats.
 564                  */
 565                 if (unlikely(ret < len)) {
 566                         do {
 567                                 rte_pktmbuf_free(m_table[ret]);
 568                         } while (++ret < len);
 569                 }
 570
 571                 len = 0;
 572         }
 573
 574         tx_q->len = len;
 575         return;
 576 }
 577
 578 /**
 579  * This function is called by each data core. It handles all
 580  * RX/TX registered with the core. For TX the specific lcore
 581  * linked list is used. For RX, MAC addresses are compared
 582  * with all devices in the main linked list.
 583  */
 584 static int
 585 switch_worker(__rte_unused void *arg)
 586 {
 587         struct rte_mempool *mbuf_pool = arg;
 588         struct vhost_dev *vdev = NULL;
 589         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 590         struct virtio_net_data_ll *dev_ll;
 591         struct mbuf_table *tx_q;
 592         volatile struct lcore_ll_info *lcore_ll;
 593         const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1)
 594                                         / US_PER_S * BURST_TX_DRAIN_US;
 595         uint64_t prev_tsc, diff_tsc, cur_tsc, ret_count = 0;
 596         unsigned i, ret = 0;
 597         const uint16_t lcore_id = rte_lcore_id();
 598         const uint16_t num_cores = (uint16_t)rte_lcore_count();
 599         uint16_t rx_count = 0;
 600         uint16_t tx_count;
 601         uint32_t retry = 0;
 602
 603         RTE_LOG(INFO, VHOST_DATA, "Procesing on Core %u started\n", lcore_id);
 604         lcore_ll = lcore_info[lcore_id].lcore_ll;
 605         prev_tsc = 0;
 606
 607         tx_q = &lcore_tx_queue[lcore_id];
 608         for (i = 0; i < num_cores; i++) {
 609                 if (lcore_ids[i] == lcore_id) {
 610                         tx_q->txq_id = i;
 611                         break;
 612                 }
 613         }
 614
 615         while (1) {
 616                 cur_tsc = rte_rdtsc();
 617                 /*
 618                  * TX burst queue drain
 619                  */
 620                 diff_tsc = cur_tsc - prev_tsc;
 621                 if (unlikely(diff_tsc > drain_tsc)) {
 622
 623                         if (tx_q->len) {
 624                                 RTE_LOG_DP(DEBUG, VHOST_DATA, "TX queue drained after "
 625                                         "timeout with burst size %u\n",
 626                                         tx_q->len);
 627                                 ret = overlay_options.tx_handle(ports[0],
 628                                         (uint16_t)tx_q->txq_id,
 629                                         (struct rte_mbuf **)tx_q->m_table,
 630                                         (uint16_t)tx_q->len);
 631                                 if (unlikely(ret < tx_q->len)) {
 632                                         do {
 633                                                 rte_pktmbuf_free(tx_q->m_table[ret]);
 634                                         } while (++ret < tx_q->len);
 635                                 }
 636
 637                                 tx_q->len = 0;
 638                         }
 639
 640                         prev_tsc = cur_tsc;
 641
 642                 }
 643
 644                 rte_prefetch0(lcore_ll->ll_root_used);
 645
 646                 /**
 647                  * Inform the configuration core that we have exited
 648                  * the linked list and that no devices are
 649                  * in use if requested.
 650                  */
 651                 if (lcore_ll->dev_removal_flag == REQUEST_DEV_REMOVAL)
 652                         lcore_ll->dev_removal_flag = ACK_DEV_REMOVAL;
 653
 654                 /*
 655                  * Process devices
 656                  */
 657                 dev_ll = lcore_ll->ll_root_used;
 658
 659                 while (dev_ll != NULL) {
 660                         vdev = dev_ll->vdev;
 661
 662                         if (unlikely(vdev->remove)) {
 663                                 dev_ll = dev_ll->next;
 664                                 overlay_options.tunnel_destroy(vdev);
 665                                 vdev->ready = DEVICE_SAFE_REMOVE;
 666                                 continue;
 667                         }
 668                         if (likely(vdev->ready == DEVICE_RX)) {
 669                                 /* Handle guest RX */
 670                                 rx_count = rte_eth_rx_burst(ports[0],
 671                                         vdev->rx_q, pkts_burst, MAX_PKT_BURST);
 672
 673                                 if (rx_count) {
 674                                         /*
 675                                         * Retry is enabled and the queue is
 676                                         * full then we wait and retry to
 677                                         * avoid packet loss. Here MAX_PKT_BURST
 678                                         * must be less than virtio queue size
 679                                         */
 680                                         if (enable_retry && unlikely(rx_count >
 681                                                 rte_vhost_avail_entries(vdev->vid, VIRTIO_RXQ))) {
 682                                                 for (retry = 0; retry < burst_rx_retry_num;
 683                                                         retry++) {
 684                                                         rte_delay_us(burst_rx_delay_time);
 685                                                         if (rx_count <= rte_vhost_avail_entries(vdev->vid, VIRTIO_RXQ))
 686                                                                 break;
 687                                                 }
 688                                         }
 689
 690                                         ret_count = overlay_options.rx_handle(vdev->vid, pkts_burst, rx_count);
 691                                         if (enable_stats) {
 692                                                 rte_atomic64_add(
 693                                                 &dev_statistics[vdev->vid].rx_total_atomic,
 694                                                 rx_count);
 695                                                 rte_atomic64_add(
 696                                                 &dev_statistics[vdev->vid].rx_atomic, ret_count);
 697                                         }
 698                                         while (likely(rx_count)) {
 699                                                 rx_count--;
 700                                                 rte_pktmbuf_free(pkts_burst[rx_count]);
 701                                         }
 702
 703                                 }
 704                         }
 705
 706                         if (likely(!vdev->remove)) {
 707                                 /* Handle guest TX*/
 708                                 tx_count = rte_vhost_dequeue_burst(vdev->vid,
 709                                                 VIRTIO_TXQ, mbuf_pool,
 710                                                 pkts_burst, MAX_PKT_BURST);
 711                                 /* If this is the first received packet we need to learn the MAC */
 712                                 if (unlikely(vdev->ready == DEVICE_MAC_LEARNING) && tx_count) {
 713                                         if (vdev->remove ||
 714                                                 (overlay_options.tunnel_setup(vdev, pkts_burst[0]) == -1)) {
 715                                                 while (tx_count)
 716                                                         rte_pktmbuf_free(pkts_burst[--tx_count]);
 717                                         }
 718                                 }
 719                                 while (tx_count)
 720                                         virtio_tx_route(vdev, pkts_burst[--tx_count]);
 721                         }
 722
 723                         /* move to the next device in the list */
 724                         dev_ll = dev_ll->next;
 725                 }
 726         }
 727
 728         return 0;
 729 }
 730
 731 /**
 732  * Add an entry to a used linked list. A free entry must first be found
 733  * in the free linked list using get_data_ll_free_entry();
 734  */
 735 static void
 736 add_data_ll_entry(struct virtio_net_data_ll **ll_root_addr,
 737         struct virtio_net_data_ll *ll_dev)
 738 {
 739         struct virtio_net_data_ll *ll = *ll_root_addr;
 740
 741         /* Set next as NULL and use a compiler barrier to avoid reordering. */
 742         ll_dev->next = NULL;
 743         rte_compiler_barrier();
 744
 745         /* If ll == NULL then this is the first device. */
 746         if (ll) {
 747                 /* Increment to the tail of the linked list. */
 748                 while (ll->next != NULL)
 749                         ll = ll->next;
 750
 751                 ll->next = ll_dev;
 752         } else {
 753                 *ll_root_addr = ll_dev;
 754         }
 755 }
 756
 757 /**
 758  * Remove an entry from a used linked list. The entry must then be added to
 759  * the free linked list using put_data_ll_free_entry().
 760  */
 761 static void
 762 rm_data_ll_entry(struct virtio_net_data_ll **ll_root_addr,
 763         struct virtio_net_data_ll *ll_dev,
 764         struct virtio_net_data_ll *ll_dev_last)
 765 {
 766         struct virtio_net_data_ll *ll = *ll_root_addr;
 767
 768         if (unlikely((ll == NULL) || (ll_dev == NULL)))
 769                 return;
 770
 771         if (ll_dev == ll)
 772                 *ll_root_addr = ll_dev->next;
 773         else
 774                 if (likely(ll_dev_last != NULL))
 775                         ll_dev_last->next = ll_dev->next;
 776                 else
 777                         RTE_LOG(ERR, VHOST_CONFIG,
 778                                 "Remove entry form ll failed.\n");
 779 }
 780
 781 /**
 782  * Find and return an entry from the free linked list.
 783  */
 784 static struct virtio_net_data_ll *
 785 get_data_ll_free_entry(struct virtio_net_data_ll **ll_root_addr)
 786 {
 787         struct virtio_net_data_ll *ll_free = *ll_root_addr;
 788         struct virtio_net_data_ll *ll_dev;
 789
 790         if (ll_free == NULL)
 791                 return NULL;
 792
 793         ll_dev = ll_free;
 794         *ll_root_addr = ll_free->next;
 795
 796         return ll_dev;
 797 }
 798
 799 /**
 800  * Place an entry back on to the free linked list.
 801  */
 802 static void
 803 put_data_ll_free_entry(struct virtio_net_data_ll **ll_root_addr,
 804         struct virtio_net_data_ll *ll_dev)
 805 {
 806         struct virtio_net_data_ll *ll_free = *ll_root_addr;
 807
 808         if (ll_dev == NULL)
 809                 return;
 810
 811         ll_dev->next = ll_free;
 812         *ll_root_addr = ll_dev;
 813 }
 814
 815 /**
 816  * Creates a linked list of a given size.
 817  */
 818 static struct virtio_net_data_ll *
 819 alloc_data_ll(uint32_t size)
 820 {
 821         struct virtio_net_data_ll *ll_new;
 822         uint32_t i;
 823
 824         /* Malloc and then chain the linked list. */
 825         ll_new = malloc(size * sizeof(struct virtio_net_data_ll));
 826         if (ll_new == NULL) {
 827                 RTE_LOG(ERR, VHOST_CONFIG,
 828                         "Failed to allocate memory for ll_new.\n");
 829                 return NULL;
 830         }
 831
 832         for (i = 0; i < size - 1; i++) {
 833                 ll_new[i].vdev = NULL;
 834                 ll_new[i].next = &ll_new[i+1];
 835         }
 836         ll_new[i].next = NULL;
 837
 838         return ll_new;
 839 }
 840
 841 /**
 842  * Create the main linked list along with each individual cores
 843  * linked list. A used and a free list are created to manage entries.
 844  */
 845 static int
 846 init_data_ll(void)
 847 {
 848         int lcore;
 849
 850         RTE_LCORE_FOREACH_SLAVE(lcore) {
 851                 lcore_info[lcore].lcore_ll =
 852                         malloc(sizeof(struct lcore_ll_info));
 853                 if (lcore_info[lcore].lcore_ll == NULL) {
 854                         RTE_LOG(ERR, VHOST_CONFIG,
 855                                 "Failed to allocate memory for lcore_ll.\n");
 856                         return -1;
 857                 }
 858
 859                 lcore_info[lcore].lcore_ll->device_num = 0;
 860                 lcore_info[lcore].lcore_ll->dev_removal_flag = ACK_DEV_REMOVAL;
 861                 lcore_info[lcore].lcore_ll->ll_root_used = NULL;
 862                 if (nb_devices % nb_switching_cores)
 863                         lcore_info[lcore].lcore_ll->ll_root_free =
 864                                 alloc_data_ll((nb_devices / nb_switching_cores)
 865                                                 + 1);
 866                 else
 867                         lcore_info[lcore].lcore_ll->ll_root_free =
 868                                 alloc_data_ll(nb_devices / nb_switching_cores);
 869         }
 870
 871         /* Allocate devices up to a maximum of MAX_DEVICES. */
 872         ll_root_free = alloc_data_ll(MIN((nb_devices), MAX_DEVICES));
 873
 874         return 0;
 875 }
 876
 877 /**
 878  * Remove a device from the specific data core linked list and
 879  * from the main linked list. Synchonization occurs through the use
 880  * of the lcore dev_removal_flag.
 881  */
 882 static void
 883 destroy_device(int vid)
 884 {
 885         struct virtio_net_data_ll *ll_lcore_dev_cur;
 886         struct virtio_net_data_ll *ll_main_dev_cur;
 887         struct virtio_net_data_ll *ll_lcore_dev_last = NULL;
 888         struct virtio_net_data_ll *ll_main_dev_last = NULL;
 889         struct vhost_dev *vdev = NULL;
 890         int lcore;
 891
 892         ll_main_dev_cur = ll_root_used;
 893         while (ll_main_dev_cur != NULL) {
 894                 if (ll_main_dev_cur->vdev->vid == vid) {
 895                         vdev = ll_main_dev_cur->vdev;
 896                         break;
 897                 }
 898         }
 899         if (!vdev)
 900                 return;
 901
 902         /* set the remove flag. */
 903         vdev->remove = 1;
 904         while (vdev->ready != DEVICE_SAFE_REMOVE)
 905                 rte_pause();
 906
 907         /* Search for entry to be removed from lcore ll */
 908         ll_lcore_dev_cur = lcore_info[vdev->coreid].lcore_ll->ll_root_used;
 909         while (ll_lcore_dev_cur != NULL) {
 910                 if (ll_lcore_dev_cur->vdev == vdev) {
 911                         break;
 912                 } else {
 913                         ll_lcore_dev_last = ll_lcore_dev_cur;
 914                         ll_lcore_dev_cur = ll_lcore_dev_cur->next;
 915                 }
 916         }
 917
 918         if (ll_lcore_dev_cur == NULL) {
 919                 RTE_LOG(ERR, VHOST_CONFIG,
 920                         "(%d) Failed to find the dev to be destroy.\n", vid);
 921                 return;
 922         }
 923
 924         /* Search for entry to be removed from main ll */
 925         ll_main_dev_cur = ll_root_used;
 926         ll_main_dev_last = NULL;
 927         while (ll_main_dev_cur != NULL) {
 928                 if (ll_main_dev_cur->vdev == vdev) {
 929                         break;
 930                 } else {
 931                         ll_main_dev_last = ll_main_dev_cur;
 932                         ll_main_dev_cur = ll_main_dev_cur->next;
 933                 }
 934         }
 935
 936         /* Remove entries from the lcore and main ll. */
 937         rm_data_ll_entry(&lcore_info[vdev->coreid].lcore_ll->ll_root_used,
 938                         ll_lcore_dev_cur, ll_lcore_dev_last);
 939         rm_data_ll_entry(&ll_root_used, ll_main_dev_cur, ll_main_dev_last);
 940
 941         /* Set the dev_removal_flag on each lcore. */
 942         RTE_LCORE_FOREACH_SLAVE(lcore) {
 943                 lcore_info[lcore].lcore_ll->dev_removal_flag =
 944                         REQUEST_DEV_REMOVAL;
 945         }
 946
 947         /*
 948          * Once each core has set the dev_removal_flag to
 949          * ACK_DEV_REMOVAL we can be sure that they can no longer access
 950          * the device removed from the linked lists and that the devices
 951          * are no longer in use.
 952          */
 953         RTE_LCORE_FOREACH_SLAVE(lcore) {
 954                 while (lcore_info[lcore].lcore_ll->dev_removal_flag
 955                         != ACK_DEV_REMOVAL)
 956                         rte_pause();
 957         }
 958
 959         /* Add the entries back to the lcore and main free ll.*/
 960         put_data_ll_free_entry(&lcore_info[vdev->coreid].lcore_ll->ll_root_free,
 961                                 ll_lcore_dev_cur);
 962         put_data_ll_free_entry(&ll_root_free, ll_main_dev_cur);
 963
 964         /* Decrement number of device on the lcore. */
 965         lcore_info[vdev->coreid].lcore_ll->device_num--;
 966
 967         RTE_LOG(INFO, VHOST_DATA, "(%d) Device has been removed "
 968                 "from data core\n", vid);
 969
 970         rte_free(vdev);
 971
 972 }
 973
 974 /**
 975  * A new device is added to a data core. First the device is added
 976  * to the main linked list and the allocated to a specific data core.
 977  */
 978 static int
 979 new_device(int vid)
 980 {
 981         struct virtio_net_data_ll *ll_dev;
 982         int lcore, core_add = 0;
 983         uint32_t device_num_min = nb_devices;
 984         struct vhost_dev *vdev;
 985
 986         vdev = rte_zmalloc("vhost device", sizeof(*vdev), RTE_CACHE_LINE_SIZE);
 987         if (vdev == NULL) {
 988                 RTE_LOG(INFO, VHOST_DATA,
 989                         "(%d) Couldn't allocate memory for vhost dev\n", vid);
 990                 return -1;
 991         }
 992         vdev->vid = vid;
 993         /* Add device to main ll */
 994         ll_dev = get_data_ll_free_entry(&ll_root_free);
 995         if (ll_dev == NULL) {
 996                 RTE_LOG(INFO, VHOST_DATA, "(%d) No free entry found in"
 997                         " linked list Device limit of %d devices per core"
 998                         " has been reached\n", vid, nb_devices);
 999                 if (vdev->regions_hpa)
1000                         rte_free(vdev->regions_hpa);
1001                 rte_free(vdev);
1002                 return -1;
1003         }
1004         ll_dev->vdev = vdev;
1005         add_data_ll_entry(&ll_root_used, ll_dev);
1006         vdev->rx_q = vid;
1007
1008         /* reset ready flag */
1009         vdev->ready = DEVICE_MAC_LEARNING;
1010         vdev->remove = 0;
1011
1012         /* Find a suitable lcore to add the device. */
1013         RTE_LCORE_FOREACH_SLAVE(lcore) {
1014                 if (lcore_info[lcore].lcore_ll->device_num < device_num_min) {
1015                         device_num_min = lcore_info[lcore].lcore_ll->device_num;
1016                         core_add = lcore;
1017                 }
1018         }
1019         /* Add device to lcore ll */
1020         ll_dev = get_data_ll_free_entry(&lcore_info[core_add].lcore_ll->ll_root_free);
1021         if (ll_dev == NULL) {
1022                 RTE_LOG(INFO, VHOST_DATA,
1023                         "(%d) Failed to add device to data core\n",
1024                         vid);
1025                 vdev->ready = DEVICE_SAFE_REMOVE;
1026                 destroy_device(vid);
1027                 rte_free(vdev->regions_hpa);
1028                 rte_free(vdev);
1029                 return -1;
1030         }
1031         ll_dev->vdev = vdev;
1032         vdev->coreid = core_add;
1033
1034         add_data_ll_entry(&lcore_info[vdev->coreid].lcore_ll->ll_root_used,
1035                         ll_dev);
1036
1037         /* Initialize device stats */
1038         memset(&dev_statistics[vid], 0,
1039                 sizeof(struct device_statistics));
1040
1041         /* Disable notifications. */
1042         rte_vhost_enable_guest_notification(vid, VIRTIO_RXQ, 0);
1043         rte_vhost_enable_guest_notification(vid, VIRTIO_TXQ, 0);
1044         lcore_info[vdev->coreid].lcore_ll->device_num++;
1045
1046         RTE_LOG(INFO, VHOST_DATA, "(%d) Device has been added to data core %d\n",
1047                 vid, vdev->coreid);
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * These callback allow devices to be added to the data core when configuration
1054  * has been fully complete.
1055  */
1056 static const struct vhost_device_ops virtio_net_device_ops = {
1057         .new_device =  new_device,
1058         .destroy_device = destroy_device,
1059 };
1060
1061 /**
1062  * This is a thread will wake up after a period to print stats if the user has
1063  * enabled them.
1064  */
1065 static void
1066 print_stats(void)
1067 {
1068         struct virtio_net_data_ll *dev_ll;
1069         uint64_t tx_dropped, rx_dropped;
1070         uint64_t tx, tx_total, rx, rx_total, rx_ip_csum, rx_l4_csum;
1071         int vid;
1072         const char clr[] = { 27, '[', '2', 'J', '\0' };
1073         const char top_left[] = { 27, '[', '1', ';', '1', 'H', '\0' };
1074
1075         while (1) {
1076                 sleep(enable_stats);
1077
1078                 /* Clear screen and move to top left */
1079                 printf("%s%s", clr, top_left);
1080
1081                 printf("\nDevice statistics ================================");
1082
1083                 dev_ll = ll_root_used;
1084                 while (dev_ll != NULL) {
1085                         vid = dev_ll->vdev->vid;
1086                         tx_total = dev_statistics[vid].tx_total;
1087                         tx = dev_statistics[vid].tx;
1088                         tx_dropped = tx_total - tx;
1089
1090                         rx_total = rte_atomic64_read(
1091                                 &dev_statistics[vid].rx_total_atomic);
1092                         rx = rte_atomic64_read(
1093                                 &dev_statistics[vid].rx_atomic);
1094                         rx_dropped = rx_total - rx;
1095                         rx_ip_csum = rte_atomic64_read(
1096                                 &dev_statistics[vid].rx_bad_ip_csum);
1097                         rx_l4_csum = rte_atomic64_read(
1098                                 &dev_statistics[vid].rx_bad_l4_csum);
1099
1100                         printf("\nStatistics for device %d ----------"
1101                                         "\nTX total:            %"PRIu64""
1102                                         "\nTX dropped:          %"PRIu64""
1103                                         "\nTX successful:               %"PRIu64""
1104                                         "\nRX total:            %"PRIu64""
1105                                         "\nRX bad IP csum:      %"PRIu64""
1106                                         "\nRX bad L4 csum:      %"PRIu64""
1107                                         "\nRX dropped:          %"PRIu64""
1108                                         "\nRX successful:               %"PRIu64"",
1109                                         vid,
1110                                         tx_total,
1111                                         tx_dropped,
1112                                         tx,
1113                                         rx_total,
1114                                         rx_ip_csum,
1115                                         rx_l4_csum,
1116                                         rx_dropped,
1117                                         rx);
1118
1119                         dev_ll = dev_ll->next;
1120                 }
1121                 printf("\n================================================\n");
1122         }
1123 }
1124
1125 /**
1126  * Main function, does initialisation and calls the per-lcore functions.
1127  */
1128 int
1129 main(int argc, char *argv[])
1130 {
1131         struct rte_mempool *mbuf_pool = NULL;
1132         unsigned lcore_id, core_id = 0;
1133         unsigned nb_ports, valid_nb_ports;
1134         int ret;
1135         uint16_t portid;
1136         uint16_t queue_id;
1137         static pthread_t tid;
1138         char thread_name[RTE_MAX_THREAD_NAME_LEN];
1139
1140         /* init EAL */
1141         ret = rte_eal_init(argc, argv);
1142         if (ret < 0)
1143                 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
1144         argc -= ret;
1145         argv += ret;
1146
1147         /* parse app arguments */
1148         ret = tep_termination_parse_args(argc, argv);
1149         if (ret < 0)
1150                 rte_exit(EXIT_FAILURE, "Invalid argument\n");
1151
1152         for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++)
1153                 if (rte_lcore_is_enabled(lcore_id))
1154                         lcore_ids[core_id++] = lcore_id;
1155
1156         /* set the number of swithcing cores available */
1157         nb_switching_cores = rte_lcore_count()-1;
1158
1159         /* Get the number of physical ports. */
1160         nb_ports = rte_eth_dev_count();
1161
1162         /*
1163          * Update the global var NB_PORTS and global array PORTS
1164          * and get value of var VALID_NB_PORTS according to system ports number
1165          */
1166         valid_nb_ports = check_ports_num(nb_ports);
1167
1168         if ((valid_nb_ports == 0) || (valid_nb_ports > MAX_SUP_PORTS)) {
1169                 rte_exit(EXIT_FAILURE, "Current enabled port number is %u,"
1170                         "but only %u port can be enabled\n", nb_ports,
1171                         MAX_SUP_PORTS);
1172         }
1173         /* Create the mbuf pool. */
1174         mbuf_pool = rte_pktmbuf_pool_create(
1175                         "MBUF_POOL",
1176                         NUM_MBUFS_PER_PORT * valid_nb_ports,
1177                         MBUF_CACHE_SIZE,
1178                         0,
1179                         MBUF_DATA_SIZE,
1180                         rte_socket_id());
1181         if (mbuf_pool == NULL)
1182                 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
1183
1184         for (queue_id = 0; queue_id < MAX_QUEUES + 1; queue_id++)
1185                 vpool_array[queue_id].pool = mbuf_pool;
1186
1187         /* initialize all ports */
1188         for (portid = 0; portid < nb_ports; portid++) {
1189                 /* skip ports that are not enabled */
1190                 if ((enabled_port_mask & (1 << portid)) == 0) {
1191                         RTE_LOG(INFO, VHOST_PORT,
1192                                 "Skipping disabled port %d\n", portid);
1193                         continue;
1194                 }
1195                 if (overlay_options.port_configure(portid, mbuf_pool) != 0)
1196                         rte_exit(EXIT_FAILURE,
1197                                 "Cannot initialize network ports\n");
1198         }
1199
1200         /* Initialise all linked lists. */
1201         if (init_data_ll() == -1)
1202                 rte_exit(EXIT_FAILURE, "Failed to initialize linked list\n");
1203
1204         /* Initialize device stats */
1205         memset(&dev_statistics, 0, sizeof(dev_statistics));
1206
1207         /* Enable stats if the user option is set. */
1208         if (enable_stats) {
1209                 ret = pthread_create(&tid, NULL, (void *)print_stats, NULL);
1210                 if (ret != 0)
1211                         rte_exit(EXIT_FAILURE, "Cannot create print-stats thread\n");
1212                 snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN, "print-stats");
1213                 ret = rte_thread_setname(tid, thread_name);
1214                 if (ret != 0)
1215                         RTE_LOG(DEBUG, VHOST_CONFIG, "Cannot set print-stats name\n");
1216         }
1217
1218         /* Launch all data cores. */
1219         RTE_LCORE_FOREACH_SLAVE(lcore_id) {
1220                 rte_eal_remote_launch(switch_worker,
1221                         mbuf_pool, lcore_id);
1222         }
1223
1224         ret = rte_vhost_driver_register((char *)&dev_basename, 0);
1225         if (ret != 0)
1226                 rte_exit(EXIT_FAILURE, "failed to register vhost driver.\n");
1227
1228         rte_vhost_driver_disable_features(dev_basename,
1229                 1ULL << VIRTIO_NET_F_MRG_RXBUF);
1230
1231         ret = rte_vhost_driver_callback_register(dev_basename,
1232                 &virtio_net_device_ops);
1233         if (ret != 0) {
1234                 rte_exit(EXIT_FAILURE,
1235                         "failed to register vhost driver callbacks.\n");
1236         }
1237
1238         if (rte_vhost_driver_start(dev_basename) < 0) {
1239                 rte_exit(EXIT_FAILURE,
1240                         "failed to start vhost driver.\n");
1241         }
1242
1243         RTE_LCORE_FOREACH_SLAVE(lcore_id)
1244                 rte_eal_wait_lcore(lcore_id);
1245
1246         return 0;
1247 }