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         }
 246
 247         pthread_mutex_lock(&vsocket->conn_mutex);
 248         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 249         pthread_mutex_unlock(&vsocket->conn_mutex);
 250 }
 251
 252 /* call back when there is new vhost-user connection from client  */
 253 static void
 254 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 255 {
 256         struct vhost_user_socket *vsocket = dat;
 257
 258         fd = accept(fd, NULL, NULL);
 259         if (fd < 0)
 260                 return;
 261
 262         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 263         vhost_user_add_connection(fd, vsocket);
 264 }
 265
 266 static void
 267 vhost_user_read_cb(int connfd, void *dat, int *remove)
 268 {
 269         struct vhost_user_connection *conn = dat;
 270         struct vhost_user_socket *vsocket = conn->vsocket;
 271         int ret;
 272
 273         ret = vhost_user_msg_handler(conn->vid, connfd);
 274         if (ret < 0) {
 275                 close(connfd);
 276                 *remove = 1;
 277                 vhost_destroy_device(conn->vid);
 278
 279                 pthread_mutex_lock(&vsocket->conn_mutex);
 280                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 281                 pthread_mutex_unlock(&vsocket->conn_mutex);
 282
 283                 free(conn);
 284
 285                 if (vsocket->reconnect) {
 286                         create_unix_socket(vsocket);
 287                         vhost_user_start_client(vsocket);
 288                 }
 289         }
 290 }
 291
 292 static int
 293 create_unix_socket(struct vhost_user_socket *vsocket)
 294 {
 295         int fd;
 296         struct sockaddr_un *un = &vsocket->un;
 297
 298         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 299         if (fd < 0)
 300                 return -1;
 301         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 302                 vsocket->is_server ? "server" : "client", fd);
 303
 304         if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 305                 RTE_LOG(ERR, VHOST_CONFIG,
 306                         "vhost-user: can't set nonblocking mode for socket, fd: "
 307                         "%d (%s)\n", fd, strerror(errno));
 308                 close(fd);
 309                 return -1;
 310         }
 311
 312         memset(un, 0, sizeof(*un));
 313         un->sun_family = AF_UNIX;
 314         strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
 315         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 316
 317         vsocket->socket_fd = fd;
 318         return 0;
 319 }
 320
 321 static int
 322 vhost_user_start_server(struct vhost_user_socket *vsocket)
 323 {
 324         int ret;
 325         int fd = vsocket->socket_fd;
 326         const char *path = vsocket->path;
 327
 328         ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 329         if (ret < 0) {
 330                 RTE_LOG(ERR, VHOST_CONFIG,
 331                         "failed to bind to %s: %s; remove it and try again\n",
 332                         path, strerror(errno));
 333                 goto err;
 334         }
 335         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 336
 337         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 338         if (ret < 0)
 339                 goto err;
 340
 341         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 342                   NULL, vsocket);
 343         if (ret < 0) {
 344                 RTE_LOG(ERR, VHOST_CONFIG,
 345                         "failed to add listen fd %d to vhost server fdset\n",
 346                         fd);
 347                 goto err;
 348         }
 349
 350         return 0;
 351
 352 err:
 353         close(fd);
 354         return -1;
 355 }
 356
 357 struct vhost_user_reconnect {
 358         struct sockaddr_un un;
 359         int fd;
 360         struct vhost_user_socket *vsocket;
 361
 362         TAILQ_ENTRY(vhost_user_reconnect) next;
 363 };
 364
 365 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 366 struct vhost_user_reconnect_list {
 367         struct vhost_user_reconnect_tailq_list head;
 368         pthread_mutex_t mutex;
 369 };
 370
 371 static struct vhost_user_reconnect_list reconn_list;
 372 static pthread_t reconn_tid;
 373
 374 static int
 375 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 376 {
 377         int ret, flags;
 378
 379         ret = connect(fd, un, sz);
 380         if (ret < 0 && errno != EISCONN)
 381                 return -1;
 382
 383         flags = fcntl(fd, F_GETFL, 0);
 384         if (flags < 0) {
 385                 RTE_LOG(ERR, VHOST_CONFIG,
 386                         "can't get flags for connfd %d\n", fd);
 387                 return -2;
 388         }
 389         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 390                 RTE_LOG(ERR, VHOST_CONFIG,
 391                                 "can't disable nonblocking on fd %d\n", fd);
 392                 return -2;
 393         }
 394         return 0;
 395 }
 396
 397 static void *
 398 vhost_user_client_reconnect(void *arg __rte_unused)
 399 {
 400         int ret;
 401         struct vhost_user_reconnect *reconn, *next;
 402
 403         while (1) {
 404                 pthread_mutex_lock(&reconn_list.mutex);
 405
 406                 /*
 407                  * An equal implementation of TAILQ_FOREACH_SAFE,
 408                  * which does not exist on all platforms.
 409                  */
 410                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 411                      reconn != NULL; reconn = next) {
 412                         next = TAILQ_NEXT(reconn, next);
 413
 414                         ret = vhost_user_connect_nonblock(reconn->fd,
 415                                                 (struct sockaddr *)&reconn->un,
 416                                                 sizeof(reconn->un));
 417                         if (ret == -2) {
 418                                 close(reconn->fd);
 419                                 RTE_LOG(ERR, VHOST_CONFIG,
 420                                         "reconnection for fd %d failed\n",
 421                                         reconn->fd);
 422                                 goto remove_fd;
 423                         }
 424                         if (ret == -1)
 425                                 continue;
 426
 427                         RTE_LOG(INFO, VHOST_CONFIG,
 428                                 "%s: connected\n", reconn->vsocket->path);
 429                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 430 remove_fd:
 431                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 432                         free(reconn);
 433                 }
 434
 435                 pthread_mutex_unlock(&reconn_list.mutex);
 436                 sleep(1);
 437         }
 438
 439         return NULL;
 440 }
 441
 442 static int
 443 vhost_user_reconnect_init(void)
 444 {
 445         int ret;
 446
 447         pthread_mutex_init(&reconn_list.mutex, NULL);
 448         TAILQ_INIT(&reconn_list.head);
 449
 450         ret = pthread_create(&reconn_tid, NULL,
 451                              vhost_user_client_reconnect, NULL);
 452         if (ret < 0)
 453                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 454
 455         return ret;
 456 }
 457
 458 static int
 459 vhost_user_start_client(struct vhost_user_socket *vsocket)
 460 {
 461         int ret;
 462         int fd = vsocket->socket_fd;
 463         const char *path = vsocket->path;
 464         struct vhost_user_reconnect *reconn;
 465
 466         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
 467                                           sizeof(vsocket->un));
 468         if (ret == 0) {
 469                 vhost_user_add_connection(fd, vsocket);
 470                 return 0;
 471         }
 472
 473         RTE_LOG(WARNING, VHOST_CONFIG,
 474                 "failed to connect to %s: %s\n",
 475                 path, strerror(errno));
 476
 477         if (ret == -2 || !vsocket->reconnect) {
 478                 close(fd);
 479                 return -1;
 480         }
 481
 482         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 483         reconn = malloc(sizeof(*reconn));
 484         if (reconn == NULL) {
 485                 RTE_LOG(ERR, VHOST_CONFIG,
 486                         "failed to allocate memory for reconnect\n");
 487                 close(fd);
 488                 return -1;
 489         }
 490         reconn->un = vsocket->un;
 491         reconn->fd = fd;
 492         reconn->vsocket = vsocket;
 493         pthread_mutex_lock(&reconn_list.mutex);
 494         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 495         pthread_mutex_unlock(&reconn_list.mutex);
 496
 497         return 0;
 498 }
 499
 500 static struct vhost_user_socket *
 501 find_vhost_user_socket(const char *path)
 502 {
 503         int i;
 504
 505         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 506                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 507
 508                 if (!strcmp(vsocket->path, path))
 509                         return vsocket;
 510         }
 511
 512         return NULL;
 513 }
 514
 515 int
 516 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 517 {
 518         struct vhost_user_socket *vsocket;
 519
 520         pthread_mutex_lock(&vhost_user.mutex);
 521         vsocket = find_vhost_user_socket(path);
 522         if (vsocket)
 523                 vsocket->features &= ~features;
 524         pthread_mutex_unlock(&vhost_user.mutex);
 525
 526         return vsocket ? 0 : -1;
 527 }
 528
 529 int
 530 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 531 {
 532         struct vhost_user_socket *vsocket;
 533
 534         pthread_mutex_lock(&vhost_user.mutex);
 535         vsocket = find_vhost_user_socket(path);
 536         if (vsocket) {
 537                 if ((vsocket->supported_features & features) != features) {
 538                         /*
 539                          * trying to enable features the driver doesn't
 540                          * support.
 541                          */
 542                         pthread_mutex_unlock(&vhost_user.mutex);
 543                         return -1;
 544                 }
 545                 vsocket->features |= features;
 546         }
 547         pthread_mutex_unlock(&vhost_user.mutex);
 548
 549         return vsocket ? 0 : -1;
 550 }
 551
 552 int
 553 rte_vhost_driver_set_features(const char *path, uint64_t features)
 554 {
 555         struct vhost_user_socket *vsocket;
 556
 557         pthread_mutex_lock(&vhost_user.mutex);
 558         vsocket = find_vhost_user_socket(path);
 559         if (vsocket) {
 560                 vsocket->supported_features = features;
 561                 vsocket->features = features;
 562         }
 563         pthread_mutex_unlock(&vhost_user.mutex);
 564
 565         return vsocket ? 0 : -1;
 566 }
 567
 568 int
 569 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 570 {
 571         struct vhost_user_socket *vsocket;
 572
 573         pthread_mutex_lock(&vhost_user.mutex);
 574         vsocket = find_vhost_user_socket(path);
 575         if (vsocket)
 576                 *features = vsocket->features;
 577         pthread_mutex_unlock(&vhost_user.mutex);
 578
 579         if (!vsocket) {
 580                 RTE_LOG(ERR, VHOST_CONFIG,
 581                         "socket file %s is not registered yet.\n", path);
 582                 return -1;
 583         } else {
 584                 return 0;
 585         }
 586 }
 587
 588 /*
 589  * Register a new vhost-user socket; here we could act as server
 590  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 591  * is set.
 592  */
 593 int
 594 rte_vhost_driver_register(const char *path, uint64_t flags)
 595 {
 596         int ret = -1;
 597         struct vhost_user_socket *vsocket;
 598
 599         if (!path)
 600                 return -1;
 601
 602         pthread_mutex_lock(&vhost_user.mutex);
 603
 604         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 605                 RTE_LOG(ERR, VHOST_CONFIG,
 606                         "error: the number of vhost sockets reaches maximum\n");
 607                 goto out;
 608         }
 609
 610         vsocket = malloc(sizeof(struct vhost_user_socket));
 611         if (!vsocket)
 612                 goto out;
 613         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 614         vsocket->path = strdup(path);
 615         TAILQ_INIT(&vsocket->conn_list);
 616         pthread_mutex_init(&vsocket->conn_mutex, NULL);
 617         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 618
 619         /*
 620          * Set the supported features correctly for the builtin vhost-user
 621          * net driver.
 622          *
 623          * Applications know nothing about features the builtin virtio net
 624          * driver (virtio_net.c) supports, thus it's not possible for them
 625          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 626          * we set it unconditionally. If the application want to implement
 627          * another vhost-user driver (say SCSI), it should call the
 628          * rte_vhost_driver_set_features(), which will overwrite following
 629          * two values.
 630          */
 631         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 632         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 633
 634         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 635                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 636                 if (vsocket->reconnect && reconn_tid == 0) {
 637                         if (vhost_user_reconnect_init() < 0) {
 638                                 free(vsocket->path);
 639                                 free(vsocket);
 640                                 goto out;
 641                         }
 642                 }
 643         } else {
 644                 vsocket->is_server = true;
 645         }
 646         ret = create_unix_socket(vsocket);
 647         if (ret < 0) {
 648                 free(vsocket->path);
 649                 free(vsocket);
 650                 goto out;
 651         }
 652
 653         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 654
 655 out:
 656         pthread_mutex_unlock(&vhost_user.mutex);
 657
 658         return ret;
 659 }
 660
 661 static bool
 662 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 663 {
 664         int found = false;
 665         struct vhost_user_reconnect *reconn, *next;
 666
 667         pthread_mutex_lock(&reconn_list.mutex);
 668
 669         for (reconn = TAILQ_FIRST(&reconn_list.head);
 670              reconn != NULL; reconn = next) {
 671                 next = TAILQ_NEXT(reconn, next);
 672
 673                 if (reconn->vsocket == vsocket) {
 674                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 675                         close(reconn->fd);
 676                         free(reconn);
 677                         found = true;
 678                         break;
 679                 }
 680         }
 681         pthread_mutex_unlock(&reconn_list.mutex);
 682         return found;
 683 }
 684
 685 /**
 686  * Unregister the specified vhost socket
 687  */
 688 int
 689 rte_vhost_driver_unregister(const char *path)
 690 {
 691         int i;
 692         int count;
 693         struct vhost_user_connection *conn, *next;
 694
 695         pthread_mutex_lock(&vhost_user.mutex);
 696
 697         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 698                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 699
 700                 if (!strcmp(vsocket->path, path)) {
 701                         if (vsocket->is_server) {
 702                                 fdset_del(&vhost_user.fdset, vsocket->socket_fd);
 703                                 close(vsocket->socket_fd);
 704                                 unlink(path);
 705                         } else if (vsocket->reconnect) {
 706                                 vhost_user_remove_reconnect(vsocket);
 707                         }
 708
 709                         pthread_mutex_lock(&vsocket->conn_mutex);
 710                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 711                              conn != NULL;
 712                              conn = next) {
 713                                 next = TAILQ_NEXT(conn, next);
 714
 715                                 fdset_del(&vhost_user.fdset, conn->connfd);
 716                                 RTE_LOG(INFO, VHOST_CONFIG,
 717                                         "free connfd = %d for device '%s'\n",
 718                                         conn->connfd, path);
 719                                 close(conn->connfd);
 720                                 vhost_destroy_device(conn->vid);
 721                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 722                                 free(conn);
 723                         }
 724                         pthread_mutex_unlock(&vsocket->conn_mutex);
 725
 726                         free(vsocket->path);
 727                         free(vsocket);
 728
 729                         count = --vhost_user.vsocket_cnt;
 730                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 731                         vhost_user.vsockets[count] = NULL;
 732                         pthread_mutex_unlock(&vhost_user.mutex);
 733
 734                         return 0;
 735                 }
 736         }
 737         pthread_mutex_unlock(&vhost_user.mutex);
 738
 739         return -1;
 740 }
 741
 742 /*
 743  * Register ops so that we can add/remove device to data core.
 744  */
 745 int
 746 rte_vhost_driver_callback_register(const char *path,
 747         struct vhost_device_ops const * const ops)
 748 {
 749         struct vhost_user_socket *vsocket;
 750
 751         pthread_mutex_lock(&vhost_user.mutex);
 752         vsocket = find_vhost_user_socket(path);
 753         if (vsocket)
 754                 vsocket->notify_ops = ops;
 755         pthread_mutex_unlock(&vhost_user.mutex);
 756
 757         return vsocket ? 0 : -1;
 758 }
 759
 760 struct vhost_device_ops const *
 761 vhost_driver_callback_get(const char *path)
 762 {
 763         struct vhost_user_socket *vsocket;
 764
 765         pthread_mutex_lock(&vhost_user.mutex);
 766         vsocket = find_vhost_user_socket(path);
 767         pthread_mutex_unlock(&vhost_user.mutex);
 768
 769         return vsocket ? vsocket->notify_ops : NULL;
 770 }
 771
 772 int
 773 rte_vhost_driver_start(const char *path)
 774 {
 775         struct vhost_user_socket *vsocket;
 776         static pthread_t fdset_tid;
 777
 778         pthread_mutex_lock(&vhost_user.mutex);
 779         vsocket = find_vhost_user_socket(path);
 780         pthread_mutex_unlock(&vhost_user.mutex);
 781
 782         if (!vsocket)
 783                 return -1;
 784
 785         if (fdset_tid == 0) {
 786                 int ret = pthread_create(&fdset_tid, NULL, fdset_event_dispatch,
 787                                      &vhost_user.fdset);
 788                 if (ret < 0)
 789                         RTE_LOG(ERR, VHOST_CONFIG,
 790                                 "failed to create fdset handling thread");
 791         }
 792
 793         if (vsocket->is_server)
 794                 return vhost_user_start_server(vsocket);
 795         else
 796                 return vhost_user_start_client(vsocket);
 797 }