lib/librte_vhost/socket.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2016 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 <fcntl.h>
  47 #include <pthread.h>
  48
  49 #include <rte_log.h>
  50
  51 #include "fd_man.h"
  52 #include "vhost.h"
  53 #include "vhost_user.h"
  54
  55
  56 TAILQ_HEAD(vhost_user_connection_list, vhost_user_connection);
  57
  58 /*
  59  * Every time rte_vhost_driver_register() is invoked, an associated
  60  * vhost_user_socket struct will be created.
  61  */
  62 struct vhost_user_socket {
  63         struct vhost_user_connection_list conn_list;
  64         pthread_mutex_t conn_mutex;
  65         char *path;
  66         int listenfd;
  67         bool is_server;
  68         bool reconnect;
  69         bool dequeue_zero_copy;
  70
  71         /*
  72          * The "supported_features" indicates the feature bits the
  73          * vhost driver supports. The "features" indicates the feature
  74          * bits after the rte_vhost_driver_features_disable/enable().
  75          * It is also the final feature bits used for vhost-user
  76          * features negotiation.
  77          */
  78         uint64_t supported_features;
  79         uint64_t features;
  80 };
  81
  82 struct vhost_user_connection {
  83         struct vhost_user_socket *vsocket;
  84         int connfd;
  85         int vid;
  86
  87         TAILQ_ENTRY(vhost_user_connection) next;
  88 };
  89
  90 #define MAX_VHOST_SOCKET 1024
  91 struct vhost_user {
  92         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  93         struct fdset fdset;
  94         int vsocket_cnt;
  95         pthread_mutex_t mutex;
  96 };
  97
  98 #define MAX_VIRTIO_BACKLOG 128
  99
 100 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
 101 static void vhost_user_read_cb(int fd, void *dat, int *remove);
 102 static int vhost_user_create_client(struct vhost_user_socket *vsocket);
 103
 104 static struct vhost_user vhost_user = {
 105         .fdset = {
 106                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
 107                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
 108                 .num = 0
 109         },
 110         .vsocket_cnt = 0,
 111         .mutex = PTHREAD_MUTEX_INITIALIZER,
 112 };
 113
 114 /* return bytes# of read on success or negative val on failure. */
 115 int
 116 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 117 {
 118         struct iovec iov;
 119         struct msghdr msgh;
 120         size_t fdsize = fd_num * sizeof(int);
 121         char control[CMSG_SPACE(fdsize)];
 122         struct cmsghdr *cmsg;
 123         int ret;
 124
 125         memset(&msgh, 0, sizeof(msgh));
 126         iov.iov_base = buf;
 127         iov.iov_len  = buflen;
 128
 129         msgh.msg_iov = &iov;
 130         msgh.msg_iovlen = 1;
 131         msgh.msg_control = control;
 132         msgh.msg_controllen = sizeof(control);
 133
 134         ret = recvmsg(sockfd, &msgh, 0);
 135         if (ret <= 0) {
 136                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 137                 return ret;
 138         }
 139
 140         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 141                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 142                 return -1;
 143         }
 144
 145         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 146                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 147                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 148                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 149                         memcpy(fds, CMSG_DATA(cmsg), fdsize);
 150                         break;
 151                 }
 152         }
 153
 154         return ret;
 155 }
 156
 157 int
 158 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 159 {
 160
 161         struct iovec iov;
 162         struct msghdr msgh;
 163         size_t fdsize = fd_num * sizeof(int);
 164         char control[CMSG_SPACE(fdsize)];
 165         struct cmsghdr *cmsg;
 166         int ret;
 167
 168         memset(&msgh, 0, sizeof(msgh));
 169         iov.iov_base = buf;
 170         iov.iov_len = buflen;
 171
 172         msgh.msg_iov = &iov;
 173         msgh.msg_iovlen = 1;
 174
 175         if (fds && fd_num > 0) {
 176                 msgh.msg_control = control;
 177                 msgh.msg_controllen = sizeof(control);
 178                 cmsg = CMSG_FIRSTHDR(&msgh);
 179                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 180                 cmsg->cmsg_level = SOL_SOCKET;
 181                 cmsg->cmsg_type = SCM_RIGHTS;
 182                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 183         } else {
 184                 msgh.msg_control = NULL;
 185                 msgh.msg_controllen = 0;
 186         }
 187
 188         do {
 189                 ret = sendmsg(sockfd, &msgh, 0);
 190         } while (ret < 0 && errno == EINTR);
 191
 192         if (ret < 0) {
 193                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 194                 return ret;
 195         }
 196
 197         return ret;
 198 }
 199
 200 static void
 201 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 202 {
 203         int vid;
 204         size_t size;
 205         struct vhost_user_connection *conn;
 206         int ret;
 207
 208         conn = malloc(sizeof(*conn));
 209         if (conn == NULL) {
 210                 close(fd);
 211                 return;
 212         }
 213
 214         vid = vhost_new_device();
 215         if (vid == -1) {
 216                 close(fd);
 217                 free(conn);
 218                 return;
 219         }
 220
 221         size = strnlen(vsocket->path, PATH_MAX);
 222         vhost_set_ifname(vid, vsocket->path, size);
 223
 224         if (vsocket->dequeue_zero_copy)
 225                 vhost_enable_dequeue_zero_copy(vid);
 226
 227         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 228
 229         conn->connfd = fd;
 230         conn->vsocket = vsocket;
 231         conn->vid = vid;
 232         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 233                         NULL, conn);
 234         if (ret < 0) {
 235                 conn->connfd = -1;
 236                 free(conn);
 237                 close(fd);
 238                 RTE_LOG(ERR, VHOST_CONFIG,
 239                         "failed to add fd %d into vhost server fdset\n",
 240                         fd);
 241         }
 242
 243         pthread_mutex_lock(&vsocket->conn_mutex);
 244         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 245         pthread_mutex_unlock(&vsocket->conn_mutex);
 246 }
 247
 248 /* call back when there is new vhost-user connection from client  */
 249 static void
 250 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 251 {
 252         struct vhost_user_socket *vsocket = dat;
 253
 254         fd = accept(fd, NULL, NULL);
 255         if (fd < 0)
 256                 return;
 257
 258         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 259         vhost_user_add_connection(fd, vsocket);
 260 }
 261
 262 static void
 263 vhost_user_read_cb(int connfd, void *dat, int *remove)
 264 {
 265         struct vhost_user_connection *conn = dat;
 266         struct vhost_user_socket *vsocket = conn->vsocket;
 267         int ret;
 268
 269         ret = vhost_user_msg_handler(conn->vid, connfd);
 270         if (ret < 0) {
 271                 close(connfd);
 272                 *remove = 1;
 273                 vhost_destroy_device(conn->vid);
 274
 275                 pthread_mutex_lock(&vsocket->conn_mutex);
 276                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 277                 pthread_mutex_unlock(&vsocket->conn_mutex);
 278
 279                 free(conn);
 280
 281                 if (vsocket->reconnect)
 282                         vhost_user_create_client(vsocket);
 283         }
 284 }
 285
 286 static int
 287 create_unix_socket(const char *path, struct sockaddr_un *un, bool is_server)
 288 {
 289         int fd;
 290
 291         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 292         if (fd < 0)
 293                 return -1;
 294         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 295                 is_server ? "server" : "client", fd);
 296
 297         if (!is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 298                 RTE_LOG(ERR, VHOST_CONFIG,
 299                         "vhost-user: can't set nonblocking mode for socket, fd: "
 300                         "%d (%s)\n", fd, strerror(errno));
 301                 close(fd);
 302                 return -1;
 303         }
 304
 305         memset(un, 0, sizeof(*un));
 306         un->sun_family = AF_UNIX;
 307         strncpy(un->sun_path, path, sizeof(un->sun_path));
 308         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 309
 310         return fd;
 311 }
 312
 313 static int
 314 vhost_user_create_server(struct vhost_user_socket *vsocket)
 315 {
 316         int fd;
 317         int ret;
 318         struct sockaddr_un un;
 319         const char *path = vsocket->path;
 320
 321         fd = create_unix_socket(path, &un, vsocket->is_server);
 322         if (fd < 0)
 323                 return -1;
 324
 325         ret = bind(fd, (struct sockaddr *)&un, sizeof(un));
 326         if (ret < 0) {
 327                 RTE_LOG(ERR, VHOST_CONFIG,
 328                         "failed to bind to %s: %s; remove it and try again\n",
 329                         path, strerror(errno));
 330                 goto err;
 331         }
 332         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 333
 334         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 335         if (ret < 0)
 336                 goto err;
 337
 338         vsocket->listenfd = fd;
 339         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 340                   NULL, vsocket);
 341         if (ret < 0) {
 342                 RTE_LOG(ERR, VHOST_CONFIG,
 343                         "failed to add listen fd %d to vhost server fdset\n",
 344                         fd);
 345                 goto err;
 346         }
 347
 348         return 0;
 349
 350 err:
 351         close(fd);
 352         return -1;
 353 }
 354
 355 struct vhost_user_reconnect {
 356         struct sockaddr_un un;
 357         int fd;
 358         struct vhost_user_socket *vsocket;
 359
 360         TAILQ_ENTRY(vhost_user_reconnect) next;
 361 };
 362
 363 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 364 struct vhost_user_reconnect_list {
 365         struct vhost_user_reconnect_tailq_list head;
 366         pthread_mutex_t mutex;
 367 };
 368
 369 static struct vhost_user_reconnect_list reconn_list;
 370 static pthread_t reconn_tid;
 371
 372 static int
 373 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 374 {
 375         int ret, flags;
 376
 377         ret = connect(fd, un, sz);
 378         if (ret < 0 && errno != EISCONN)
 379                 return -1;
 380
 381         flags = fcntl(fd, F_GETFL, 0);
 382         if (flags < 0) {
 383                 RTE_LOG(ERR, VHOST_CONFIG,
 384                         "can't get flags for connfd %d\n", fd);
 385                 return -2;
 386         }
 387         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 388                 RTE_LOG(ERR, VHOST_CONFIG,
 389                                 "can't disable nonblocking on fd %d\n", fd);
 390                 return -2;
 391         }
 392         return 0;
 393 }
 394
 395 static void *
 396 vhost_user_client_reconnect(void *arg __rte_unused)
 397 {
 398         int ret;
 399         struct vhost_user_reconnect *reconn, *next;
 400
 401         while (1) {
 402                 pthread_mutex_lock(&reconn_list.mutex);
 403
 404                 /*
 405                  * An equal implementation of TAILQ_FOREACH_SAFE,
 406                  * which does not exist on all platforms.
 407                  */
 408                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 409                      reconn != NULL; reconn = next) {
 410                         next = TAILQ_NEXT(reconn, next);
 411
 412                         ret = vhost_user_connect_nonblock(reconn->fd,
 413                                                 (struct sockaddr *)&reconn->un,
 414                                                 sizeof(reconn->un));
 415                         if (ret == -2) {
 416                                 close(reconn->fd);
 417                                 RTE_LOG(ERR, VHOST_CONFIG,
 418                                         "reconnection for fd %d failed\n",
 419                                         reconn->fd);
 420                                 goto remove_fd;
 421                         }
 422                         if (ret == -1)
 423                                 continue;
 424
 425                         RTE_LOG(INFO, VHOST_CONFIG,
 426                                 "%s: connected\n", reconn->vsocket->path);
 427                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 428 remove_fd:
 429                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 430                         free(reconn);
 431                 }
 432
 433                 pthread_mutex_unlock(&reconn_list.mutex);
 434                 sleep(1);
 435         }
 436
 437         return NULL;
 438 }
 439
 440 static int
 441 vhost_user_reconnect_init(void)
 442 {
 443         int ret;
 444
 445         pthread_mutex_init(&reconn_list.mutex, NULL);
 446         TAILQ_INIT(&reconn_list.head);
 447
 448         ret = pthread_create(&reconn_tid, NULL,
 449                              vhost_user_client_reconnect, NULL);
 450         if (ret < 0)
 451                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 452
 453         return ret;
 454 }
 455
 456 static int
 457 vhost_user_create_client(struct vhost_user_socket *vsocket)
 458 {
 459         int fd;
 460         int ret;
 461         struct sockaddr_un un;
 462         const char *path = vsocket->path;
 463         struct vhost_user_reconnect *reconn;
 464
 465         fd = create_unix_socket(path, &un, vsocket->is_server);
 466         if (fd < 0)
 467                 return -1;
 468
 469         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&un,
 470                                           sizeof(un));
 471         if (ret == 0) {
 472                 vhost_user_add_connection(fd, vsocket);
 473                 return 0;
 474         }
 475
 476         RTE_LOG(WARNING, VHOST_CONFIG,
 477                 "failed to connect to %s: %s\n",
 478                 path, strerror(errno));
 479
 480         if (ret == -2 || !vsocket->reconnect) {
 481                 close(fd);
 482                 return -1;
 483         }
 484
 485         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 486         reconn = malloc(sizeof(*reconn));
 487         if (reconn == NULL) {
 488                 RTE_LOG(ERR, VHOST_CONFIG,
 489                         "failed to allocate memory for reconnect\n");
 490                 close(fd);
 491                 return -1;
 492         }
 493         reconn->un = un;
 494         reconn->fd = fd;
 495         reconn->vsocket = vsocket;
 496         pthread_mutex_lock(&reconn_list.mutex);
 497         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 498         pthread_mutex_unlock(&reconn_list.mutex);
 499
 500         return 0;
 501 }
 502
 503 static struct vhost_user_socket *
 504 find_vhost_user_socket(const char *path)
 505 {
 506         int i;
 507
 508         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 509                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 510
 511                 if (!strcmp(vsocket->path, path))
 512                         return vsocket;
 513         }
 514
 515         return NULL;
 516 }
 517
 518 int
 519 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 520 {
 521         struct vhost_user_socket *vsocket;
 522
 523         pthread_mutex_lock(&vhost_user.mutex);
 524         vsocket = find_vhost_user_socket(path);
 525         if (vsocket)
 526                 vsocket->features &= ~features;
 527         pthread_mutex_unlock(&vhost_user.mutex);
 528
 529         return vsocket ? 0 : -1;
 530 }
 531
 532 int
 533 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 534 {
 535         struct vhost_user_socket *vsocket;
 536
 537         pthread_mutex_lock(&vhost_user.mutex);
 538         vsocket = find_vhost_user_socket(path);
 539         if (vsocket) {
 540                 if ((vsocket->supported_features & features) != features) {
 541                         /*
 542                          * trying to enable features the driver doesn't
 543                          * support.
 544                          */
 545                         pthread_mutex_unlock(&vhost_user.mutex);
 546                         return -1;
 547                 }
 548                 vsocket->features |= features;
 549         }
 550         pthread_mutex_unlock(&vhost_user.mutex);
 551
 552         return vsocket ? 0 : -1;
 553 }
 554
 555 int
 556 rte_vhost_driver_set_features(const char *path, uint64_t features)
 557 {
 558         struct vhost_user_socket *vsocket;
 559
 560         pthread_mutex_lock(&vhost_user.mutex);
 561         vsocket = find_vhost_user_socket(path);
 562         if (vsocket) {
 563                 vsocket->supported_features = features;
 564                 vsocket->features = features;
 565         }
 566         pthread_mutex_unlock(&vhost_user.mutex);
 567
 568         return vsocket ? 0 : -1;
 569 }
 570
 571 int
 572 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 573 {
 574         struct vhost_user_socket *vsocket;
 575
 576         pthread_mutex_lock(&vhost_user.mutex);
 577         vsocket = find_vhost_user_socket(path);
 578         if (vsocket)
 579                 *features = vsocket->features;
 580         pthread_mutex_unlock(&vhost_user.mutex);
 581
 582         if (!vsocket) {
 583                 RTE_LOG(ERR, VHOST_CONFIG,
 584                         "socket file %s is not registered yet.\n", path);
 585                 return -1;
 586         } else {
 587                 return 0;
 588         }
 589 }
 590
 591 /*
 592  * Register a new vhost-user socket; here we could act as server
 593  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 594  * is set.
 595  */
 596 int
 597 rte_vhost_driver_register(const char *path, uint64_t flags)
 598 {
 599         int ret = -1;
 600         struct vhost_user_socket *vsocket;
 601
 602         if (!path)
 603                 return -1;
 604
 605         pthread_mutex_lock(&vhost_user.mutex);
 606
 607         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 608                 RTE_LOG(ERR, VHOST_CONFIG,
 609                         "error: the number of vhost sockets reaches maximum\n");
 610                 goto out;
 611         }
 612
 613         vsocket = malloc(sizeof(struct vhost_user_socket));
 614         if (!vsocket)
 615                 goto out;
 616         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 617         vsocket->path = strdup(path);
 618         TAILQ_INIT(&vsocket->conn_list);
 619         pthread_mutex_init(&vsocket->conn_mutex, NULL);
 620         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 621
 622         /*
 623          * Set the supported features correctly for the builtin vhost-user
 624          * net driver.
 625          *
 626          * Applications know nothing about features the builtin virtio net
 627          * driver (virtio_net.c) supports, thus it's not possible for them
 628          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 629          * we set it unconditionally. If the application want to implement
 630          * another vhost-user driver (say SCSI), it should call the
 631          * rte_vhost_driver_set_features(), which will overwrite following
 632          * two values.
 633          */
 634         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 635         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 636
 637         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 638                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 639                 if (vsocket->reconnect && reconn_tid == 0) {
 640                         if (vhost_user_reconnect_init() < 0) {
 641                                 free(vsocket->path);
 642                                 free(vsocket);
 643                                 goto out;
 644                         }
 645                 }
 646                 ret = vhost_user_create_client(vsocket);
 647         } else {
 648                 vsocket->is_server = true;
 649                 ret = vhost_user_create_server(vsocket);
 650         }
 651         if (ret < 0) {
 652                 free(vsocket->path);
 653                 free(vsocket);
 654                 goto out;
 655         }
 656
 657         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 658
 659 out:
 660         pthread_mutex_unlock(&vhost_user.mutex);
 661
 662         return ret;
 663 }
 664
 665 static bool
 666 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 667 {
 668         int found = false;
 669         struct vhost_user_reconnect *reconn, *next;
 670
 671         pthread_mutex_lock(&reconn_list.mutex);
 672
 673         for (reconn = TAILQ_FIRST(&reconn_list.head);
 674              reconn != NULL; reconn = next) {
 675                 next = TAILQ_NEXT(reconn, next);
 676
 677                 if (reconn->vsocket == vsocket) {
 678                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 679                         close(reconn->fd);
 680                         free(reconn);
 681                         found = true;
 682                         break;
 683                 }
 684         }
 685         pthread_mutex_unlock(&reconn_list.mutex);
 686         return found;
 687 }
 688
 689 /**
 690  * Unregister the specified vhost socket
 691  */
 692 int
 693 rte_vhost_driver_unregister(const char *path)
 694 {
 695         int i;
 696         int count;
 697         struct vhost_user_connection *conn, *next;
 698
 699         pthread_mutex_lock(&vhost_user.mutex);
 700
 701         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 702                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 703
 704                 if (!strcmp(vsocket->path, path)) {
 705                         if (vsocket->is_server) {
 706                                 fdset_del(&vhost_user.fdset, vsocket->listenfd);
 707                                 close(vsocket->listenfd);
 708                                 unlink(path);
 709                         } else if (vsocket->reconnect) {
 710                                 vhost_user_remove_reconnect(vsocket);
 711                         }
 712
 713                         pthread_mutex_lock(&vsocket->conn_mutex);
 714                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 715                              conn != NULL;
 716                              conn = next) {
 717                                 next = TAILQ_NEXT(conn, next);
 718
 719                                 fdset_del(&vhost_user.fdset, conn->connfd);
 720                                 RTE_LOG(INFO, VHOST_CONFIG,
 721                                         "free connfd = %d for device '%s'\n",
 722                                         conn->connfd, path);
 723                                 close(conn->connfd);
 724                                 vhost_destroy_device(conn->vid);
 725                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 726                                 free(conn);
 727                         }
 728                         pthread_mutex_unlock(&vsocket->conn_mutex);
 729
 730                         free(vsocket->path);
 731                         free(vsocket);
 732
 733                         count = --vhost_user.vsocket_cnt;
 734                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 735                         vhost_user.vsockets[count] = NULL;
 736                         pthread_mutex_unlock(&vhost_user.mutex);
 737
 738                         return 0;
 739                 }
 740         }
 741         pthread_mutex_unlock(&vhost_user.mutex);
 742
 743         return -1;
 744 }
 745
 746 int
 747 rte_vhost_driver_session_start(void)
 748 {
 749         fdset_event_dispatch(&vhost_user.fdset);
 750         return 0;
 751 }