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