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 socket_fd;
  67         struct sockaddr_un un;
  68         bool is_server;
  69         bool reconnect;
  70         bool dequeue_zero_copy;
  71
  72         /*
  73          * The "supported_features" indicates the feature bits the
  74          * vhost driver supports. The "features" indicates the feature
  75          * bits after the rte_vhost_driver_features_disable/enable().
  76          * It is also the final feature bits used for vhost-user
  77          * features negotiation.
  78          */
  79         uint64_t supported_features;
  80         uint64_t features;
  81
  82         struct vhost_device_ops const *notify_ops;
  83 };
  84
  85 struct vhost_user_connection {
  86         struct vhost_user_socket *vsocket;
  87         int connfd;
  88         int vid;
  89
  90         TAILQ_ENTRY(vhost_user_connection) next;
  91 };
  92
  93 #define MAX_VHOST_SOCKET 1024
  94 struct vhost_user {
  95         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  96         struct fdset fdset;
  97         int vsocket_cnt;
  98         pthread_mutex_t mutex;
  99 };
 100
 101 #define MAX_VIRTIO_BACKLOG 128
 102
 103 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
 104 static void vhost_user_read_cb(int fd, void *dat, int *remove);
 105 static int create_unix_socket(struct vhost_user_socket *vsocket);
 106 static int vhost_user_start_client(struct vhost_user_socket *vsocket);
 107
 108 static struct vhost_user vhost_user = {
 109         .fdset = {
 110                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
 111                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
 112                 .num = 0
 113         },
 114         .vsocket_cnt = 0,
 115         .mutex = PTHREAD_MUTEX_INITIALIZER,
 116 };
 117
 118 /* return bytes# of read on success or negative val on failure. */
 119 int
 120 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 121 {
 122         struct iovec iov;
 123         struct msghdr msgh;
 124         size_t fdsize = fd_num * sizeof(int);
 125         char control[CMSG_SPACE(fdsize)];
 126         struct cmsghdr *cmsg;
 127         int ret;
 128
 129         memset(&msgh, 0, sizeof(msgh));
 130         iov.iov_base = buf;
 131         iov.iov_len  = buflen;
 132
 133         msgh.msg_iov = &iov;
 134         msgh.msg_iovlen = 1;
 135         msgh.msg_control = control;
 136         msgh.msg_controllen = sizeof(control);
 137
 138         ret = recvmsg(sockfd, &msgh, 0);
 139         if (ret <= 0) {
 140                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 141                 return ret;
 142         }
 143
 144         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 145                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 146                 return -1;
 147         }
 148
 149         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 150                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 151                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 152                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 153                         memcpy(fds, CMSG_DATA(cmsg), fdsize);
 154                         break;
 155                 }
 156         }
 157
 158         return ret;
 159 }
 160
 161 int
 162 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 163 {
 164
 165         struct iovec iov;
 166         struct msghdr msgh;
 167         size_t fdsize = fd_num * sizeof(int);
 168         char control[CMSG_SPACE(fdsize)];
 169         struct cmsghdr *cmsg;
 170         int ret;
 171
 172         memset(&msgh, 0, sizeof(msgh));
 173         iov.iov_base = buf;
 174         iov.iov_len = buflen;
 175
 176         msgh.msg_iov = &iov;
 177         msgh.msg_iovlen = 1;
 178
 179         if (fds && fd_num > 0) {
 180                 msgh.msg_control = control;
 181                 msgh.msg_controllen = sizeof(control);
 182                 cmsg = CMSG_FIRSTHDR(&msgh);
 183                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 184                 cmsg->cmsg_level = SOL_SOCKET;
 185                 cmsg->cmsg_type = SCM_RIGHTS;
 186                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 187         } else {
 188                 msgh.msg_control = NULL;
 189                 msgh.msg_controllen = 0;
 190         }
 191
 192         do {
 193                 ret = sendmsg(sockfd, &msgh, 0);
 194         } while (ret < 0 && errno == EINTR);
 195
 196         if (ret < 0) {
 197                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 198                 return ret;
 199         }
 200
 201         return ret;
 202 }
 203
 204 static void
 205 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 206 {
 207         int vid;
 208         size_t size;
 209         struct vhost_user_connection *conn;
 210         int ret;
 211
 212         conn = malloc(sizeof(*conn));
 213         if (conn == NULL) {
 214                 close(fd);
 215                 return;
 216         }
 217
 218         vid = vhost_new_device();
 219         if (vid == -1) {
 220                 close(fd);
 221                 free(conn);
 222                 return;
 223         }
 224
 225         size = strnlen(vsocket->path, PATH_MAX);
 226         vhost_set_ifname(vid, vsocket->path, size);
 227
 228         if (vsocket->dequeue_zero_copy)
 229                 vhost_enable_dequeue_zero_copy(vid);
 230
 231         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 232
 233         conn->connfd = fd;
 234         conn->vsocket = vsocket;
 235         conn->vid = vid;
 236         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 237                         NULL, conn);
 238         if (ret < 0) {
 239                 conn->connfd = -1;
 240                 free(conn);
 241                 close(fd);
 242                 RTE_LOG(ERR, VHOST_CONFIG,
 243                         "failed to add fd %d into vhost server fdset\n",
 244                         fd);
 245                 return;
 246         }
 247
 248         pthread_mutex_lock(&vsocket->conn_mutex);
 249         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 250         pthread_mutex_unlock(&vsocket->conn_mutex);
 251 }
 252
 253 /* call back when there is new vhost-user connection from client  */
 254 static void
 255 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 256 {
 257         struct vhost_user_socket *vsocket = dat;
 258
 259         fd = accept(fd, NULL, NULL);
 260         if (fd < 0)
 261                 return;
 262
 263         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 264         vhost_user_add_connection(fd, vsocket);
 265 }
 266
 267 static void
 268 vhost_user_read_cb(int connfd, void *dat, int *remove)
 269 {
 270         struct vhost_user_connection *conn = dat;
 271         struct vhost_user_socket *vsocket = conn->vsocket;
 272         int ret;
 273
 274         ret = vhost_user_msg_handler(conn->vid, connfd);
 275         if (ret < 0) {
 276                 close(connfd);
 277                 *remove = 1;
 278                 vhost_destroy_device(conn->vid);
 279
 280                 pthread_mutex_lock(&vsocket->conn_mutex);
 281                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 282                 pthread_mutex_unlock(&vsocket->conn_mutex);
 283
 284                 free(conn);
 285
 286                 if (vsocket->reconnect) {
 287                         create_unix_socket(vsocket);
 288                         vhost_user_start_client(vsocket);
 289                 }
 290         }
 291 }
 292
 293 static int
 294 create_unix_socket(struct vhost_user_socket *vsocket)
 295 {
 296         int fd;
 297         struct sockaddr_un *un = &vsocket->un;
 298
 299         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 300         if (fd < 0)
 301                 return -1;
 302         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 303                 vsocket->is_server ? "server" : "client", fd);
 304
 305         if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 306                 RTE_LOG(ERR, VHOST_CONFIG,
 307                         "vhost-user: can't set nonblocking mode for socket, fd: "
 308                         "%d (%s)\n", fd, strerror(errno));
 309                 close(fd);
 310                 return -1;
 311         }
 312
 313         memset(un, 0, sizeof(*un));
 314         un->sun_family = AF_UNIX;
 315         strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
 316         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 317
 318         vsocket->socket_fd = fd;
 319         return 0;
 320 }
 321
 322 static int
 323 vhost_user_start_server(struct vhost_user_socket *vsocket)
 324 {
 325         int ret;
 326         int fd = vsocket->socket_fd;
 327         const char *path = vsocket->path;
 328
 329         ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 330         if (ret < 0) {
 331                 RTE_LOG(ERR, VHOST_CONFIG,
 332                         "failed to bind to %s: %s; remove it and try again\n",
 333                         path, strerror(errno));
 334                 goto err;
 335         }
 336         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 337
 338         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 339         if (ret < 0)
 340                 goto err;
 341
 342         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 343                   NULL, vsocket);
 344         if (ret < 0) {
 345                 RTE_LOG(ERR, VHOST_CONFIG,
 346                         "failed to add listen fd %d to vhost server fdset\n",
 347                         fd);
 348                 goto err;
 349         }
 350
 351         return 0;
 352
 353 err:
 354         close(fd);
 355         return -1;
 356 }
 357
 358 struct vhost_user_reconnect {
 359         struct sockaddr_un un;
 360         int fd;
 361         struct vhost_user_socket *vsocket;
 362
 363         TAILQ_ENTRY(vhost_user_reconnect) next;
 364 };
 365
 366 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 367 struct vhost_user_reconnect_list {
 368         struct vhost_user_reconnect_tailq_list head;
 369         pthread_mutex_t mutex;
 370 };
 371
 372 static struct vhost_user_reconnect_list reconn_list;
 373 static pthread_t reconn_tid;
 374
 375 static int
 376 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 377 {
 378         int ret, flags;
 379
 380         ret = connect(fd, un, sz);
 381         if (ret < 0 && errno != EISCONN)
 382                 return -1;
 383
 384         flags = fcntl(fd, F_GETFL, 0);
 385         if (flags < 0) {
 386                 RTE_LOG(ERR, VHOST_CONFIG,
 387                         "can't get flags for connfd %d\n", fd);
 388                 return -2;
 389         }
 390         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 391                 RTE_LOG(ERR, VHOST_CONFIG,
 392                                 "can't disable nonblocking on fd %d\n", fd);
 393                 return -2;
 394         }
 395         return 0;
 396 }
 397
 398 static void *
 399 vhost_user_client_reconnect(void *arg __rte_unused)
 400 {
 401         int ret;
 402         struct vhost_user_reconnect *reconn, *next;
 403
 404         while (1) {
 405                 pthread_mutex_lock(&reconn_list.mutex);
 406
 407                 /*
 408                  * An equal implementation of TAILQ_FOREACH_SAFE,
 409                  * which does not exist on all platforms.
 410                  */
 411                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 412                      reconn != NULL; reconn = next) {
 413                         next = TAILQ_NEXT(reconn, next);
 414
 415                         ret = vhost_user_connect_nonblock(reconn->fd,
 416                                                 (struct sockaddr *)&reconn->un,
 417                                                 sizeof(reconn->un));
 418                         if (ret == -2) {
 419                                 close(reconn->fd);
 420                                 RTE_LOG(ERR, VHOST_CONFIG,
 421                                         "reconnection for fd %d failed\n",
 422                                         reconn->fd);
 423                                 goto remove_fd;
 424                         }
 425                         if (ret == -1)
 426                                 continue;
 427
 428                         RTE_LOG(INFO, VHOST_CONFIG,
 429                                 "%s: connected\n", reconn->vsocket->path);
 430                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 431 remove_fd:
 432                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 433                         free(reconn);
 434                 }
 435
 436                 pthread_mutex_unlock(&reconn_list.mutex);
 437                 sleep(1);
 438         }
 439
 440         return NULL;
 441 }
 442
 443 static int
 444 vhost_user_reconnect_init(void)
 445 {
 446         int ret;
 447
 448         ret = pthread_mutex_init(&reconn_list.mutex, NULL);
 449         if (ret < 0) {
 450                 RTE_LOG(ERR, VHOST_CONFIG, "failed to initialize mutex");
 451                 return ret;
 452         }
 453         TAILQ_INIT(&reconn_list.head);
 454
 455         ret = pthread_create(&reconn_tid, NULL,
 456                              vhost_user_client_reconnect, NULL);
 457         if (ret < 0) {
 458                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 459                 if (pthread_mutex_destroy(&reconn_list.mutex)) {
 460                         RTE_LOG(ERR, VHOST_CONFIG,
 461                                 "failed to destroy reconnect mutex");
 462                 }
 463         }
 464
 465         return ret;
 466 }
 467
 468 static int
 469 vhost_user_start_client(struct vhost_user_socket *vsocket)
 470 {
 471         int ret;
 472         int fd = vsocket->socket_fd;
 473         const char *path = vsocket->path;
 474         struct vhost_user_reconnect *reconn;
 475
 476         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
 477                                           sizeof(vsocket->un));
 478         if (ret == 0) {
 479                 vhost_user_add_connection(fd, vsocket);
 480                 return 0;
 481         }
 482
 483         RTE_LOG(WARNING, VHOST_CONFIG,
 484                 "failed to connect to %s: %s\n",
 485                 path, strerror(errno));
 486
 487         if (ret == -2 || !vsocket->reconnect) {
 488                 close(fd);
 489                 return -1;
 490         }
 491
 492         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 493         reconn = malloc(sizeof(*reconn));
 494         if (reconn == NULL) {
 495                 RTE_LOG(ERR, VHOST_CONFIG,
 496                         "failed to allocate memory for reconnect\n");
 497                 close(fd);
 498                 return -1;
 499         }
 500         reconn->un = vsocket->un;
 501         reconn->fd = fd;
 502         reconn->vsocket = vsocket;
 503         pthread_mutex_lock(&reconn_list.mutex);
 504         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 505         pthread_mutex_unlock(&reconn_list.mutex);
 506
 507         return 0;
 508 }
 509
 510 static struct vhost_user_socket *
 511 find_vhost_user_socket(const char *path)
 512 {
 513         int i;
 514
 515         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 516                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 517
 518                 if (!strcmp(vsocket->path, path))
 519                         return vsocket;
 520         }
 521
 522         return NULL;
 523 }
 524
 525 int
 526 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 527 {
 528         struct vhost_user_socket *vsocket;
 529
 530         pthread_mutex_lock(&vhost_user.mutex);
 531         vsocket = find_vhost_user_socket(path);
 532         if (vsocket)
 533                 vsocket->features &= ~features;
 534         pthread_mutex_unlock(&vhost_user.mutex);
 535
 536         return vsocket ? 0 : -1;
 537 }
 538
 539 int
 540 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 541 {
 542         struct vhost_user_socket *vsocket;
 543
 544         pthread_mutex_lock(&vhost_user.mutex);
 545         vsocket = find_vhost_user_socket(path);
 546         if (vsocket) {
 547                 if ((vsocket->supported_features & features) != features) {
 548                         /*
 549                          * trying to enable features the driver doesn't
 550                          * support.
 551                          */
 552                         pthread_mutex_unlock(&vhost_user.mutex);
 553                         return -1;
 554                 }
 555                 vsocket->features |= features;
 556         }
 557         pthread_mutex_unlock(&vhost_user.mutex);
 558
 559         return vsocket ? 0 : -1;
 560 }
 561
 562 int
 563 rte_vhost_driver_set_features(const char *path, uint64_t features)
 564 {
 565         struct vhost_user_socket *vsocket;
 566
 567         pthread_mutex_lock(&vhost_user.mutex);
 568         vsocket = find_vhost_user_socket(path);
 569         if (vsocket) {
 570                 vsocket->supported_features = features;
 571                 vsocket->features = features;
 572         }
 573         pthread_mutex_unlock(&vhost_user.mutex);
 574
 575         return vsocket ? 0 : -1;
 576 }
 577
 578 int
 579 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 580 {
 581         struct vhost_user_socket *vsocket;
 582
 583         pthread_mutex_lock(&vhost_user.mutex);
 584         vsocket = find_vhost_user_socket(path);
 585         if (vsocket)
 586                 *features = vsocket->features;
 587         pthread_mutex_unlock(&vhost_user.mutex);
 588
 589         if (!vsocket) {
 590                 RTE_LOG(ERR, VHOST_CONFIG,
 591                         "socket file %s is not registered yet.\n", path);
 592                 return -1;
 593         } else {
 594                 return 0;
 595         }
 596 }
 597
 598 /*
 599  * Register a new vhost-user socket; here we could act as server
 600  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 601  * is set.
 602  */
 603 int
 604 rte_vhost_driver_register(const char *path, uint64_t flags)
 605 {
 606         int ret = -1;
 607         struct vhost_user_socket *vsocket;
 608
 609         if (!path)
 610                 return -1;
 611
 612         pthread_mutex_lock(&vhost_user.mutex);
 613
 614         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 615                 RTE_LOG(ERR, VHOST_CONFIG,
 616                         "error: the number of vhost sockets reaches maximum\n");
 617                 goto out;
 618         }
 619
 620         vsocket = malloc(sizeof(struct vhost_user_socket));
 621         if (!vsocket)
 622                 goto out;
 623         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 624         vsocket->path = strdup(path);
 625         if (vsocket->path == NULL) {
 626                 RTE_LOG(ERR, VHOST_CONFIG,
 627                         "error: failed to copy socket path string\n");
 628                 free(vsocket);
 629                 goto out;
 630         }
 631         TAILQ_INIT(&vsocket->conn_list);
 632         ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
 633         if (ret) {
 634                 RTE_LOG(ERR, VHOST_CONFIG,
 635                         "error: failed to init connection mutex\n");
 636                 goto out_free;
 637         }
 638         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 639
 640         /*
 641          * Set the supported features correctly for the builtin vhost-user
 642          * net driver.
 643          *
 644          * Applications know nothing about features the builtin virtio net
 645          * driver (virtio_net.c) supports, thus it's not possible for them
 646          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 647          * we set it unconditionally. If the application want to implement
 648          * another vhost-user driver (say SCSI), it should call the
 649          * rte_vhost_driver_set_features(), which will overwrite following
 650          * two values.
 651          */
 652         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 653         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 654
 655         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 656                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 657                 if (vsocket->reconnect && reconn_tid == 0) {
 658                         if (vhost_user_reconnect_init() < 0) {
 659                                 goto out_mutex;
 660                         }
 661                 }
 662         } else {
 663                 vsocket->is_server = true;
 664         }
 665         ret = create_unix_socket(vsocket);
 666         if (ret < 0) {
 667                 goto out_mutex;
 668         }
 669
 670         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 671
 672         pthread_mutex_unlock(&vhost_user.mutex);
 673         return ret;
 674
 675 out_mutex:
 676         if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
 677                 RTE_LOG(ERR, VHOST_CONFIG,
 678                         "error: failed to destroy connection mutex\n");
 679         }
 680 out_free:
 681         free(vsocket->path);
 682         free(vsocket);
 683 out:
 684         pthread_mutex_unlock(&vhost_user.mutex);
 685
 686         return ret;
 687 }
 688
 689 static bool
 690 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 691 {
 692         int found = false;
 693         struct vhost_user_reconnect *reconn, *next;
 694
 695         pthread_mutex_lock(&reconn_list.mutex);
 696
 697         for (reconn = TAILQ_FIRST(&reconn_list.head);
 698              reconn != NULL; reconn = next) {
 699                 next = TAILQ_NEXT(reconn, next);
 700
 701                 if (reconn->vsocket == vsocket) {
 702                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 703                         close(reconn->fd);
 704                         free(reconn);
 705                         found = true;
 706                         break;
 707                 }
 708         }
 709         pthread_mutex_unlock(&reconn_list.mutex);
 710         return found;
 711 }
 712
 713 /**
 714  * Unregister the specified vhost socket
 715  */
 716 int
 717 rte_vhost_driver_unregister(const char *path)
 718 {
 719         int i;
 720         int count;
 721         struct vhost_user_connection *conn, *next;
 722
 723         pthread_mutex_lock(&vhost_user.mutex);
 724
 725         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 726                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 727
 728                 if (!strcmp(vsocket->path, path)) {
 729                         if (vsocket->is_server) {
 730                                 fdset_del(&vhost_user.fdset, vsocket->socket_fd);
 731                                 close(vsocket->socket_fd);
 732                                 unlink(path);
 733                         } else if (vsocket->reconnect) {
 734                                 vhost_user_remove_reconnect(vsocket);
 735                         }
 736
 737                         pthread_mutex_lock(&vsocket->conn_mutex);
 738                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 739                              conn != NULL;
 740                              conn = next) {
 741                                 next = TAILQ_NEXT(conn, next);
 742
 743                                 fdset_del(&vhost_user.fdset, conn->connfd);
 744                                 RTE_LOG(INFO, VHOST_CONFIG,
 745                                         "free connfd = %d for device '%s'\n",
 746                                         conn->connfd, path);
 747                                 close(conn->connfd);
 748                                 vhost_destroy_device(conn->vid);
 749                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 750                                 free(conn);
 751                         }
 752                         pthread_mutex_unlock(&vsocket->conn_mutex);
 753
 754                         pthread_mutex_destroy(&vsocket->conn_mutex);
 755                         free(vsocket->path);
 756                         free(vsocket);
 757
 758                         count = --vhost_user.vsocket_cnt;
 759                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 760                         vhost_user.vsockets[count] = NULL;
 761                         pthread_mutex_unlock(&vhost_user.mutex);
 762
 763                         return 0;
 764                 }
 765         }
 766         pthread_mutex_unlock(&vhost_user.mutex);
 767
 768         return -1;
 769 }
 770
 771 /*
 772  * Register ops so that we can add/remove device to data core.
 773  */
 774 int
 775 rte_vhost_driver_callback_register(const char *path,
 776         struct vhost_device_ops const * const ops)
 777 {
 778         struct vhost_user_socket *vsocket;
 779
 780         pthread_mutex_lock(&vhost_user.mutex);
 781         vsocket = find_vhost_user_socket(path);
 782         if (vsocket)
 783                 vsocket->notify_ops = ops;
 784         pthread_mutex_unlock(&vhost_user.mutex);
 785
 786         return vsocket ? 0 : -1;
 787 }
 788
 789 struct vhost_device_ops const *
 790 vhost_driver_callback_get(const char *path)
 791 {
 792         struct vhost_user_socket *vsocket;
 793
 794         pthread_mutex_lock(&vhost_user.mutex);
 795         vsocket = find_vhost_user_socket(path);
 796         pthread_mutex_unlock(&vhost_user.mutex);
 797
 798         return vsocket ? vsocket->notify_ops : NULL;
 799 }
 800
 801 int
 802 rte_vhost_driver_start(const char *path)
 803 {
 804         struct vhost_user_socket *vsocket;
 805         static pthread_t fdset_tid;
 806
 807         pthread_mutex_lock(&vhost_user.mutex);
 808         vsocket = find_vhost_user_socket(path);
 809         pthread_mutex_unlock(&vhost_user.mutex);
 810
 811         if (!vsocket)
 812                 return -1;
 813
 814         if (fdset_tid == 0) {
 815                 int ret = pthread_create(&fdset_tid, NULL, fdset_event_dispatch,
 816                                      &vhost_user.fdset);
 817                 if (ret < 0)
 818                         RTE_LOG(ERR, VHOST_CONFIG,
 819                                 "failed to create fdset handling thread");
 820         }
 821
 822         if (vsocket->is_server)
 823                 return vhost_user_start_server(vsocket);
 824         else
 825                 return vhost_user_start_client(vsocket);
 826 }