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