lib/librte_vhost/vhost_user/vhost-net-user.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdint.h>
  35 #include <stdio.h>
  36 #include <stdbool.h>
  37 #include <limits.h>
  38 #include <stdlib.h>
  39 #include <unistd.h>
  40 #include <string.h>
  41 #include <sys/types.h>
  42 #include <sys/socket.h>
  43 #include <sys/un.h>
  44 #include <sys/queue.h>
  45 #include <errno.h>
  46 #include <pthread.h>
  47
  48 #include <rte_log.h>
  49 #include <rte_virtio_net.h>
  50
  51 #include "fd_man.h"
  52 #include "vhost-net-user.h"
  53 #include "vhost-net.h"
  54 #include "virtio-net-user.h"
  55
  56 /*
  57  * Every time rte_vhost_driver_register() is invoked, an associated
  58  * vhost_user_socket struct will be created.
  59  */
  60 struct vhost_user_socket {
  61         char *path;
  62         int listenfd;
  63         bool is_server;
  64         bool reconnect;
  65 };
  66
  67 struct vhost_user_connection {
  68         struct vhost_user_socket *vsocket;
  69         int vid;
  70 };
  71
  72 #define MAX_VHOST_SOCKET 1024
  73 struct vhost_user {
  74         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  75         struct fdset fdset;
  76         int vsocket_cnt;
  77         pthread_mutex_t mutex;
  78 };
  79
  80 #define MAX_VIRTIO_BACKLOG 128
  81
  82 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
  83 static void vhost_user_msg_handler(int fd, void *dat, int *remove);
  84 static int vhost_user_create_client(struct vhost_user_socket *vsocket);
  85
  86 static struct vhost_user vhost_user = {
  87         .fdset = {
  88                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
  89                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
  90                 .num = 0
  91         },
  92         .vsocket_cnt = 0,
  93         .mutex = PTHREAD_MUTEX_INITIALIZER,
  94 };
  95
  96 static const char *vhost_message_str[VHOST_USER_MAX] = {
  97         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  98         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  99         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
 100         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
 101         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
 102         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
 103         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
 104         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
 105         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
 106         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
 107         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
 108         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
 109         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
 110         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
 111         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
 112         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
 113         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
 114         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
 115         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
 116         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
 117 };
 118
 119 /* return bytes# of read on success or negative val on failure. */
 120 static int
 121 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 122 {
 123         struct iovec iov;
 124         struct msghdr msgh;
 125         size_t fdsize = fd_num * sizeof(int);
 126         char control[CMSG_SPACE(fdsize)];
 127         struct cmsghdr *cmsg;
 128         int ret;
 129
 130         memset(&msgh, 0, sizeof(msgh));
 131         iov.iov_base = buf;
 132         iov.iov_len  = buflen;
 133
 134         msgh.msg_iov = &iov;
 135         msgh.msg_iovlen = 1;
 136         msgh.msg_control = control;
 137         msgh.msg_controllen = sizeof(control);
 138
 139         ret = recvmsg(sockfd, &msgh, 0);
 140         if (ret <= 0) {
 141                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 142                 return ret;
 143         }
 144
 145         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 146                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 147                 return -1;
 148         }
 149
 150         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 151                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 152                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 153                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 154                         memcpy(fds, CMSG_DATA(cmsg), fdsize);
 155                         break;
 156                 }
 157         }
 158
 159         return ret;
 160 }
 161
 162 /* return bytes# of read on success or negative val on failure. */
 163 static int
 164 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
 165 {
 166         int ret;
 167
 168         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
 169                 msg->fds, VHOST_MEMORY_MAX_NREGIONS);
 170         if (ret <= 0)
 171                 return ret;
 172
 173         if (msg && msg->size) {
 174                 if (msg->size > sizeof(msg->payload)) {
 175                         RTE_LOG(ERR, VHOST_CONFIG,
 176                                 "invalid msg size: %d\n", msg->size);
 177                         return -1;
 178                 }
 179                 ret = read(sockfd, &msg->payload, msg->size);
 180                 if (ret <= 0)
 181                         return ret;
 182                 if (ret != (int)msg->size) {
 183                         RTE_LOG(ERR, VHOST_CONFIG,
 184                                 "read control message failed\n");
 185                         return -1;
 186                 }
 187         }
 188
 189         return ret;
 190 }
 191
 192 static int
 193 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 194 {
 195
 196         struct iovec iov;
 197         struct msghdr msgh;
 198         size_t fdsize = fd_num * sizeof(int);
 199         char control[CMSG_SPACE(fdsize)];
 200         struct cmsghdr *cmsg;
 201         int ret;
 202
 203         memset(&msgh, 0, sizeof(msgh));
 204         iov.iov_base = buf;
 205         iov.iov_len = buflen;
 206
 207         msgh.msg_iov = &iov;
 208         msgh.msg_iovlen = 1;
 209
 210         if (fds && fd_num > 0) {
 211                 msgh.msg_control = control;
 212                 msgh.msg_controllen = sizeof(control);
 213                 cmsg = CMSG_FIRSTHDR(&msgh);
 214                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 215                 cmsg->cmsg_level = SOL_SOCKET;
 216                 cmsg->cmsg_type = SCM_RIGHTS;
 217                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 218         } else {
 219                 msgh.msg_control = NULL;
 220                 msgh.msg_controllen = 0;
 221         }
 222
 223         do {
 224                 ret = sendmsg(sockfd, &msgh, 0);
 225         } while (ret < 0 && errno == EINTR);
 226
 227         if (ret < 0) {
 228                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 229                 return ret;
 230         }
 231
 232         return ret;
 233 }
 234
 235 static int
 236 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
 237 {
 238         int ret;
 239
 240         if (!msg)
 241                 return 0;
 242
 243         msg->flags &= ~VHOST_USER_VERSION_MASK;
 244         msg->flags |= VHOST_USER_VERSION;
 245         msg->flags |= VHOST_USER_REPLY_MASK;
 246
 247         ret = send_fd_message(sockfd, (char *)msg,
 248                 VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
 249
 250         return ret;
 251 }
 252
 253
 254 static void
 255 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 256 {
 257         int vid;
 258         size_t size;
 259         struct vhost_user_connection *conn;
 260
 261         conn = malloc(sizeof(*conn));
 262         if (conn == NULL) {
 263                 close(fd);
 264                 return;
 265         }
 266
 267         vid = vhost_new_device();
 268         if (vid == -1) {
 269                 close(fd);
 270                 free(conn);
 271                 return;
 272         }
 273
 274         size = strnlen(vsocket->path, PATH_MAX);
 275         vhost_set_ifname(vid, vsocket->path, size);
 276
 277         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 278
 279         conn->vsocket = vsocket;
 280         conn->vid = vid;
 281         fdset_add(&vhost_user.fdset, fd, vhost_user_msg_handler, NULL, conn);
 282 }
 283
 284 /* call back when there is new vhost-user connection from client  */
 285 static void
 286 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 287 {
 288         struct vhost_user_socket *vsocket = dat;
 289
 290         fd = accept(fd, NULL, NULL);
 291         if (fd < 0)
 292                 return;
 293
 294         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 295         vhost_user_add_connection(fd, vsocket);
 296 }
 297
 298 /* callback when there is message on the connfd */
 299 static void
 300 vhost_user_msg_handler(int connfd, void *dat, int *remove)
 301 {
 302         int vid;
 303         struct vhost_user_connection *conn = dat;
 304         struct VhostUserMsg msg;
 305         uint64_t features;
 306         int ret;
 307
 308         vid = conn->vid;
 309         ret = read_vhost_message(connfd, &msg);
 310         if (ret <= 0 || msg.request >= VHOST_USER_MAX) {
 311                 struct vhost_user_socket *vsocket = conn->vsocket;
 312
 313                 if (ret < 0)
 314                         RTE_LOG(ERR, VHOST_CONFIG,
 315                                 "vhost read message failed\n");
 316                 else if (ret == 0)
 317                         RTE_LOG(INFO, VHOST_CONFIG,
 318                                 "vhost peer closed\n");
 319                 else
 320                         RTE_LOG(ERR, VHOST_CONFIG,
 321                                 "vhost read incorrect message\n");
 322
 323                 close(connfd);
 324                 *remove = 1;
 325                 free(conn);
 326                 vhost_destroy_device(vid);
 327
 328                 if (vsocket->reconnect)
 329                         vhost_user_create_client(vsocket);
 330
 331                 return;
 332         }
 333
 334         RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
 335                 vhost_message_str[msg.request]);
 336         switch (msg.request) {
 337         case VHOST_USER_GET_FEATURES:
 338                 ret = vhost_get_features(vid, &features);
 339                 msg.payload.u64 = features;
 340                 msg.size = sizeof(msg.payload.u64);
 341                 send_vhost_message(connfd, &msg);
 342                 break;
 343         case VHOST_USER_SET_FEATURES:
 344                 features = msg.payload.u64;
 345                 vhost_set_features(vid, &features);
 346                 break;
 347
 348         case VHOST_USER_GET_PROTOCOL_FEATURES:
 349                 msg.payload.u64 = VHOST_USER_PROTOCOL_FEATURES;
 350                 msg.size = sizeof(msg.payload.u64);
 351                 send_vhost_message(connfd, &msg);
 352                 break;
 353         case VHOST_USER_SET_PROTOCOL_FEATURES:
 354                 user_set_protocol_features(vid, msg.payload.u64);
 355                 break;
 356
 357         case VHOST_USER_SET_OWNER:
 358                 vhost_set_owner(vid);
 359                 break;
 360         case VHOST_USER_RESET_OWNER:
 361                 vhost_reset_owner(vid);
 362                 break;
 363
 364         case VHOST_USER_SET_MEM_TABLE:
 365                 user_set_mem_table(vid, &msg);
 366                 break;
 367
 368         case VHOST_USER_SET_LOG_BASE:
 369                 user_set_log_base(vid, &msg);
 370
 371                 /* it needs a reply */
 372                 msg.size = sizeof(msg.payload.u64);
 373                 send_vhost_message(connfd, &msg);
 374                 break;
 375         case VHOST_USER_SET_LOG_FD:
 376                 close(msg.fds[0]);
 377                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
 378                 break;
 379
 380         case VHOST_USER_SET_VRING_NUM:
 381                 vhost_set_vring_num(vid, &msg.payload.state);
 382                 break;
 383         case VHOST_USER_SET_VRING_ADDR:
 384                 vhost_set_vring_addr(vid, &msg.payload.addr);
 385                 break;
 386         case VHOST_USER_SET_VRING_BASE:
 387                 vhost_set_vring_base(vid, &msg.payload.state);
 388                 break;
 389
 390         case VHOST_USER_GET_VRING_BASE:
 391                 ret = user_get_vring_base(vid, &msg.payload.state);
 392                 msg.size = sizeof(msg.payload.state);
 393                 send_vhost_message(connfd, &msg);
 394                 break;
 395
 396         case VHOST_USER_SET_VRING_KICK:
 397                 user_set_vring_kick(vid, &msg);
 398                 break;
 399         case VHOST_USER_SET_VRING_CALL:
 400                 user_set_vring_call(vid, &msg);
 401                 break;
 402
 403         case VHOST_USER_SET_VRING_ERR:
 404                 if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
 405                         close(msg.fds[0]);
 406                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
 407                 break;
 408
 409         case VHOST_USER_GET_QUEUE_NUM:
 410                 msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
 411                 msg.size = sizeof(msg.payload.u64);
 412                 send_vhost_message(connfd, &msg);
 413                 break;
 414
 415         case VHOST_USER_SET_VRING_ENABLE:
 416                 user_set_vring_enable(vid, &msg.payload.state);
 417                 break;
 418         case VHOST_USER_SEND_RARP:
 419                 user_send_rarp(vid, &msg);
 420                 break;
 421
 422         default:
 423                 break;
 424
 425         }
 426 }
 427
 428 static int
 429 create_unix_socket(const char *path, struct sockaddr_un *un, bool is_server)
 430 {
 431         int fd;
 432
 433         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 434         if (fd < 0)
 435                 return -1;
 436         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 437                 is_server ? "server" : "client", fd);
 438
 439         memset(un, 0, sizeof(*un));
 440         un->sun_family = AF_UNIX;
 441         strncpy(un->sun_path, path, sizeof(un->sun_path));
 442
 443         return fd;
 444 }
 445
 446 static int
 447 vhost_user_create_server(struct vhost_user_socket *vsocket)
 448 {
 449         int fd;
 450         int ret;
 451         struct sockaddr_un un;
 452         const char *path = vsocket->path;
 453
 454         fd = create_unix_socket(path, &un, vsocket->is_server);
 455         if (fd < 0)
 456                 return -1;
 457
 458         ret = bind(fd, (struct sockaddr *)&un, sizeof(un));
 459         if (ret < 0) {
 460                 RTE_LOG(ERR, VHOST_CONFIG,
 461                         "failed to bind to %s: %s; remove it and try again\n",
 462                         path, strerror(errno));
 463                 goto err;
 464         }
 465         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 466
 467         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 468         if (ret < 0)
 469                 goto err;
 470
 471         vsocket->listenfd = fd;
 472         fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 473                   NULL, vsocket);
 474
 475         return 0;
 476
 477 err:
 478         close(fd);
 479         return -1;
 480 }
 481
 482 struct vhost_user_reconnect {
 483         struct sockaddr_un un;
 484         int fd;
 485         struct vhost_user_socket *vsocket;
 486
 487         TAILQ_ENTRY(vhost_user_reconnect) next;
 488 };
 489
 490 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 491 struct vhost_user_reconnect_list {
 492         struct vhost_user_reconnect_tailq_list head;
 493         pthread_mutex_t mutex;
 494 };
 495
 496 static struct vhost_user_reconnect_list reconn_list;
 497 static pthread_t reconn_tid;
 498
 499 static void *
 500 vhost_user_client_reconnect(void *arg __rte_unused)
 501 {
 502         struct vhost_user_reconnect *reconn, *next;
 503
 504         while (1) {
 505                 pthread_mutex_lock(&reconn_list.mutex);
 506
 507                 /*
 508                  * An equal implementation of TAILQ_FOREACH_SAFE,
 509                  * which does not exist on all platforms.
 510                  */
 511                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 512                      reconn != NULL; reconn = next) {
 513                         next = TAILQ_NEXT(reconn, next);
 514
 515                         if (connect(reconn->fd, (struct sockaddr *)&reconn->un,
 516                                     sizeof(reconn->un)) < 0)
 517                                 continue;
 518
 519                         RTE_LOG(INFO, VHOST_CONFIG,
 520                                 "%s: connected\n", reconn->vsocket->path);
 521                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 522                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 523                         free(reconn);
 524                 }
 525
 526                 pthread_mutex_unlock(&reconn_list.mutex);
 527                 sleep(1);
 528         }
 529
 530         return NULL;
 531 }
 532
 533 static int
 534 vhost_user_reconnect_init(void)
 535 {
 536         int ret;
 537
 538         pthread_mutex_init(&reconn_list.mutex, NULL);
 539         TAILQ_INIT(&reconn_list.head);
 540
 541         ret = pthread_create(&reconn_tid, NULL,
 542                              vhost_user_client_reconnect, NULL);
 543         if (ret < 0)
 544                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 545
 546         return ret;
 547 }
 548
 549 static int
 550 vhost_user_create_client(struct vhost_user_socket *vsocket)
 551 {
 552         int fd;
 553         int ret;
 554         struct sockaddr_un un;
 555         const char *path = vsocket->path;
 556         struct vhost_user_reconnect *reconn;
 557
 558         fd = create_unix_socket(path, &un, vsocket->is_server);
 559         if (fd < 0)
 560                 return -1;
 561
 562         ret = connect(fd, (struct sockaddr *)&un, sizeof(un));
 563         if (ret == 0) {
 564                 vhost_user_add_connection(fd, vsocket);
 565                 return 0;
 566         }
 567
 568         RTE_LOG(ERR, VHOST_CONFIG,
 569                 "failed to connect to %s: %s\n",
 570                 path, strerror(errno));
 571
 572         if (!vsocket->reconnect) {
 573                 close(fd);
 574                 return -1;
 575         }
 576
 577         RTE_LOG(ERR, VHOST_CONFIG, "%s: reconnecting...\n", path);
 578         reconn = malloc(sizeof(*reconn));
 579         reconn->un = un;
 580         reconn->fd = fd;
 581         reconn->vsocket = vsocket;
 582         pthread_mutex_lock(&reconn_list.mutex);
 583         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 584         pthread_mutex_unlock(&reconn_list.mutex);
 585
 586         return 0;
 587 }
 588
 589 /*
 590  * Register a new vhost-user socket; here we could act as server
 591  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 592  * is set.
 593  */
 594 int
 595 rte_vhost_driver_register(const char *path, uint64_t flags)
 596 {
 597         int ret = -1;
 598         struct vhost_user_socket *vsocket;
 599
 600         if (!path)
 601                 return -1;
 602
 603         pthread_mutex_lock(&vhost_user.mutex);
 604
 605         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 606                 RTE_LOG(ERR, VHOST_CONFIG,
 607                         "error: the number of vhost sockets reaches maximum\n");
 608                 goto out;
 609         }
 610
 611         vsocket = malloc(sizeof(struct vhost_user_socket));
 612         if (!vsocket)
 613                 goto out;
 614         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 615         vsocket->path = strdup(path);
 616
 617         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 618                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 619                 if (vsocket->reconnect && reconn_tid == 0) {
 620                         if (vhost_user_reconnect_init() < 0)
 621                                 goto out;
 622                 }
 623                 ret = vhost_user_create_client(vsocket);
 624         } else {
 625                 vsocket->is_server = true;
 626                 ret = vhost_user_create_server(vsocket);
 627         }
 628         if (ret < 0) {
 629                 free(vsocket->path);
 630                 free(vsocket);
 631                 goto out;
 632         }
 633
 634         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 635
 636 out:
 637         pthread_mutex_unlock(&vhost_user.mutex);
 638
 639         return ret;
 640 }
 641
 642 /**
 643  * Unregister the specified vhost socket
 644  */
 645 int
 646 rte_vhost_driver_unregister(const char *path)
 647 {
 648         int i;
 649         int count;
 650
 651         pthread_mutex_lock(&vhost_user.mutex);
 652
 653         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 654                 if (!strcmp(vhost_user.vsockets[i]->path, path)) {
 655                         if (vhost_user.vsockets[i]->is_server) {
 656                                 fdset_del(&vhost_user.fdset,
 657                                         vhost_user.vsockets[i]->listenfd);
 658                                 close(vhost_user.vsockets[i]->listenfd);
 659                                 unlink(path);
 660                         }
 661
 662                         free(vhost_user.vsockets[i]->path);
 663                         free(vhost_user.vsockets[i]);
 664
 665                         count = --vhost_user.vsocket_cnt;
 666                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 667                         vhost_user.vsockets[count] = NULL;
 668                         pthread_mutex_unlock(&vhost_user.mutex);
 669
 670                         return 0;
 671                 }
 672         }
 673         pthread_mutex_unlock(&vhost_user.mutex);
 674
 675         return -1;
 676 }
 677
 678 int
 679 rte_vhost_driver_session_start(void)
 680 {
 681         fdset_event_dispatch(&vhost_user.fdset);
 682         return 0;
 683 }