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         struct virtio_net_device_ops const *notify_ops;
  82 };
  83
  84 struct vhost_user_connection {
  85         struct vhost_user_socket *vsocket;
  86         int connfd;
  87         int vid;
  88
  89         TAILQ_ENTRY(vhost_user_connection) next;
  90 };
  91
  92 #define MAX_VHOST_SOCKET 1024
  93 struct vhost_user {
  94         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  95         struct fdset fdset;
  96         int vsocket_cnt;
  97         pthread_mutex_t mutex;
  98 };
  99
 100 #define MAX_VIRTIO_BACKLOG 128
 101
 102 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
 103 static void vhost_user_read_cb(int fd, void *dat, int *remove);
 104 static int vhost_user_create_client(struct vhost_user_socket *vsocket);
 105
 106 static struct vhost_user vhost_user = {
 107         .fdset = {
 108                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
 109                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
 110                 .num = 0
 111         },
 112         .vsocket_cnt = 0,
 113         .mutex = PTHREAD_MUTEX_INITIALIZER,
 114 };
 115
 116 /* return bytes# of read on success or negative val on failure. */
 117 int
 118 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 119 {
 120         struct iovec iov;
 121         struct msghdr msgh;
 122         size_t fdsize = fd_num * sizeof(int);
 123         char control[CMSG_SPACE(fdsize)];
 124         struct cmsghdr *cmsg;
 125         int ret;
 126
 127         memset(&msgh, 0, sizeof(msgh));
 128         iov.iov_base = buf;
 129         iov.iov_len  = buflen;
 130
 131         msgh.msg_iov = &iov;
 132         msgh.msg_iovlen = 1;
 133         msgh.msg_control = control;
 134         msgh.msg_controllen = sizeof(control);
 135
 136         ret = recvmsg(sockfd, &msgh, 0);
 137         if (ret <= 0) {
 138                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 139                 return ret;
 140         }
 141
 142         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 143                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 144                 return -1;
 145         }
 146
 147         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 148                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 149                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 150                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 151                         memcpy(fds, CMSG_DATA(cmsg), fdsize);
 152                         break;
 153                 }
 154         }
 155
 156         return ret;
 157 }
 158
 159 int
 160 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 161 {
 162
 163         struct iovec iov;
 164         struct msghdr msgh;
 165         size_t fdsize = fd_num * sizeof(int);
 166         char control[CMSG_SPACE(fdsize)];
 167         struct cmsghdr *cmsg;
 168         int ret;
 169
 170         memset(&msgh, 0, sizeof(msgh));
 171         iov.iov_base = buf;
 172         iov.iov_len = buflen;
 173
 174         msgh.msg_iov = &iov;
 175         msgh.msg_iovlen = 1;
 176
 177         if (fds && fd_num > 0) {
 178                 msgh.msg_control = control;
 179                 msgh.msg_controllen = sizeof(control);
 180                 cmsg = CMSG_FIRSTHDR(&msgh);
 181                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 182                 cmsg->cmsg_level = SOL_SOCKET;
 183                 cmsg->cmsg_type = SCM_RIGHTS;
 184                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 185         } else {
 186                 msgh.msg_control = NULL;
 187                 msgh.msg_controllen = 0;
 188         }
 189
 190         do {
 191                 ret = sendmsg(sockfd, &msgh, 0);
 192         } while (ret < 0 && errno == EINTR);
 193
 194         if (ret < 0) {
 195                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 196                 return ret;
 197         }
 198
 199         return ret;
 200 }
 201
 202 static void
 203 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 204 {
 205         int vid;
 206         size_t size;
 207         struct vhost_user_connection *conn;
 208         int ret;
 209
 210         conn = malloc(sizeof(*conn));
 211         if (conn == NULL) {
 212                 close(fd);
 213                 return;
 214         }
 215
 216         vid = vhost_new_device();
 217         if (vid == -1) {
 218                 close(fd);
 219                 free(conn);
 220                 return;
 221         }
 222
 223         size = strnlen(vsocket->path, PATH_MAX);
 224         vhost_set_ifname(vid, vsocket->path, size);
 225
 226         if (vsocket->dequeue_zero_copy)
 227                 vhost_enable_dequeue_zero_copy(vid);
 228
 229         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 230
 231         conn->connfd = fd;
 232         conn->vsocket = vsocket;
 233         conn->vid = vid;
 234         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 235                         NULL, conn);
 236         if (ret < 0) {
 237                 conn->connfd = -1;
 238                 free(conn);
 239                 close(fd);
 240                 RTE_LOG(ERR, VHOST_CONFIG,
 241                         "failed to add fd %d into vhost server fdset\n",
 242                         fd);
 243         }
 244
 245         pthread_mutex_lock(&vsocket->conn_mutex);
 246         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 247         pthread_mutex_unlock(&vsocket->conn_mutex);
 248 }
 249
 250 /* call back when there is new vhost-user connection from client  */
 251 static void
 252 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 253 {
 254         struct vhost_user_socket *vsocket = dat;
 255
 256         fd = accept(fd, NULL, NULL);
 257         if (fd < 0)
 258                 return;
 259
 260         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 261         vhost_user_add_connection(fd, vsocket);
 262 }
 263
 264 static void
 265 vhost_user_read_cb(int connfd, void *dat, int *remove)
 266 {
 267         struct vhost_user_connection *conn = dat;
 268         struct vhost_user_socket *vsocket = conn->vsocket;
 269         int ret;
 270
 271         ret = vhost_user_msg_handler(conn->vid, connfd);
 272         if (ret < 0) {
 273                 close(connfd);
 274                 *remove = 1;
 275                 vhost_destroy_device(conn->vid);
 276
 277                 pthread_mutex_lock(&vsocket->conn_mutex);
 278                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 279                 pthread_mutex_unlock(&vsocket->conn_mutex);
 280
 281                 free(conn);
 282
 283                 if (vsocket->reconnect)
 284                         vhost_user_create_client(vsocket);
 285         }
 286 }
 287
 288 static int
 289 create_unix_socket(const char *path, struct sockaddr_un *un, bool is_server)
 290 {
 291         int fd;
 292
 293         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 294         if (fd < 0)
 295                 return -1;
 296         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 297                 is_server ? "server" : "client", fd);
 298
 299         if (!is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 300                 RTE_LOG(ERR, VHOST_CONFIG,
 301                         "vhost-user: can't set nonblocking mode for socket, fd: "
 302                         "%d (%s)\n", fd, strerror(errno));
 303                 close(fd);
 304                 return -1;
 305         }
 306
 307         memset(un, 0, sizeof(*un));
 308         un->sun_family = AF_UNIX;
 309         strncpy(un->sun_path, path, sizeof(un->sun_path));
 310         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 311
 312         return fd;
 313 }
 314
 315 static int
 316 vhost_user_create_server(struct vhost_user_socket *vsocket)
 317 {
 318         int fd;
 319         int ret;
 320         struct sockaddr_un un;
 321         const char *path = vsocket->path;
 322
 323         fd = create_unix_socket(path, &un, vsocket->is_server);
 324         if (fd < 0)
 325                 return -1;
 326
 327         ret = bind(fd, (struct sockaddr *)&un, sizeof(un));
 328         if (ret < 0) {
 329                 RTE_LOG(ERR, VHOST_CONFIG,
 330                         "failed to bind to %s: %s; remove it and try again\n",
 331                         path, strerror(errno));
 332                 goto err;
 333         }
 334         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 335
 336         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 337         if (ret < 0)
 338                 goto err;
 339
 340         vsocket->listenfd = fd;
 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_create_client(struct vhost_user_socket *vsocket)
 460 {
 461         int fd;
 462         int ret;
 463         struct sockaddr_un un;
 464         const char *path = vsocket->path;
 465         struct vhost_user_reconnect *reconn;
 466
 467         fd = create_unix_socket(path, &un, vsocket->is_server);
 468         if (fd < 0)
 469                 return -1;
 470
 471         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&un,
 472                                           sizeof(un));
 473         if (ret == 0) {
 474                 vhost_user_add_connection(fd, vsocket);
 475                 return 0;
 476         }
 477
 478         RTE_LOG(WARNING, VHOST_CONFIG,
 479                 "failed to connect to %s: %s\n",
 480                 path, strerror(errno));
 481
 482         if (ret == -2 || !vsocket->reconnect) {
 483                 close(fd);
 484                 return -1;
 485         }
 486
 487         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 488         reconn = malloc(sizeof(*reconn));
 489         if (reconn == NULL) {
 490                 RTE_LOG(ERR, VHOST_CONFIG,
 491                         "failed to allocate memory for reconnect\n");
 492                 close(fd);
 493                 return -1;
 494         }
 495         reconn->un = un;
 496         reconn->fd = fd;
 497         reconn->vsocket = vsocket;
 498         pthread_mutex_lock(&reconn_list.mutex);
 499         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 500         pthread_mutex_unlock(&reconn_list.mutex);
 501
 502         return 0;
 503 }
 504
 505 static struct vhost_user_socket *
 506 find_vhost_user_socket(const char *path)
 507 {
 508         int i;
 509
 510         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 511                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 512
 513                 if (!strcmp(vsocket->path, path))
 514                         return vsocket;
 515         }
 516
 517         return NULL;
 518 }
 519
 520 int
 521 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 522 {
 523         struct vhost_user_socket *vsocket;
 524
 525         pthread_mutex_lock(&vhost_user.mutex);
 526         vsocket = find_vhost_user_socket(path);
 527         if (vsocket)
 528                 vsocket->features &= ~features;
 529         pthread_mutex_unlock(&vhost_user.mutex);
 530
 531         return vsocket ? 0 : -1;
 532 }
 533
 534 int
 535 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 536 {
 537         struct vhost_user_socket *vsocket;
 538
 539         pthread_mutex_lock(&vhost_user.mutex);
 540         vsocket = find_vhost_user_socket(path);
 541         if (vsocket) {
 542                 if ((vsocket->supported_features & features) != features) {
 543                         /*
 544                          * trying to enable features the driver doesn't
 545                          * support.
 546                          */
 547                         pthread_mutex_unlock(&vhost_user.mutex);
 548                         return -1;
 549                 }
 550                 vsocket->features |= features;
 551         }
 552         pthread_mutex_unlock(&vhost_user.mutex);
 553
 554         return vsocket ? 0 : -1;
 555 }
 556
 557 int
 558 rte_vhost_driver_set_features(const char *path, uint64_t features)
 559 {
 560         struct vhost_user_socket *vsocket;
 561
 562         pthread_mutex_lock(&vhost_user.mutex);
 563         vsocket = find_vhost_user_socket(path);
 564         if (vsocket) {
 565                 vsocket->supported_features = features;
 566                 vsocket->features = features;
 567         }
 568         pthread_mutex_unlock(&vhost_user.mutex);
 569
 570         return vsocket ? 0 : -1;
 571 }
 572
 573 int
 574 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 575 {
 576         struct vhost_user_socket *vsocket;
 577
 578         pthread_mutex_lock(&vhost_user.mutex);
 579         vsocket = find_vhost_user_socket(path);
 580         if (vsocket)
 581                 *features = vsocket->features;
 582         pthread_mutex_unlock(&vhost_user.mutex);
 583
 584         if (!vsocket) {
 585                 RTE_LOG(ERR, VHOST_CONFIG,
 586                         "socket file %s is not registered yet.\n", path);
 587                 return -1;
 588         } else {
 589                 return 0;
 590         }
 591 }
 592
 593 /*
 594  * Register a new vhost-user socket; here we could act as server
 595  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 596  * is set.
 597  */
 598 int
 599 rte_vhost_driver_register(const char *path, uint64_t flags)
 600 {
 601         int ret = -1;
 602         struct vhost_user_socket *vsocket;
 603
 604         if (!path)
 605                 return -1;
 606
 607         pthread_mutex_lock(&vhost_user.mutex);
 608
 609         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 610                 RTE_LOG(ERR, VHOST_CONFIG,
 611                         "error: the number of vhost sockets reaches maximum\n");
 612                 goto out;
 613         }
 614
 615         vsocket = malloc(sizeof(struct vhost_user_socket));
 616         if (!vsocket)
 617                 goto out;
 618         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 619         vsocket->path = strdup(path);
 620         TAILQ_INIT(&vsocket->conn_list);
 621         pthread_mutex_init(&vsocket->conn_mutex, NULL);
 622         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 623
 624         /*
 625          * Set the supported features correctly for the builtin vhost-user
 626          * net driver.
 627          *
 628          * Applications know nothing about features the builtin virtio net
 629          * driver (virtio_net.c) supports, thus it's not possible for them
 630          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 631          * we set it unconditionally. If the application want to implement
 632          * another vhost-user driver (say SCSI), it should call the
 633          * rte_vhost_driver_set_features(), which will overwrite following
 634          * two values.
 635          */
 636         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 637         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 638
 639         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 640                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 641                 if (vsocket->reconnect && reconn_tid == 0) {
 642                         if (vhost_user_reconnect_init() < 0) {
 643                                 free(vsocket->path);
 644                                 free(vsocket);
 645                                 goto out;
 646                         }
 647                 }
 648                 ret = vhost_user_create_client(vsocket);
 649         } else {
 650                 vsocket->is_server = true;
 651                 ret = vhost_user_create_server(vsocket);
 652         }
 653         if (ret < 0) {
 654                 free(vsocket->path);
 655                 free(vsocket);
 656                 goto out;
 657         }
 658
 659         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 660
 661 out:
 662         pthread_mutex_unlock(&vhost_user.mutex);
 663
 664         return ret;
 665 }
 666
 667 static bool
 668 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 669 {
 670         int found = false;
 671         struct vhost_user_reconnect *reconn, *next;
 672
 673         pthread_mutex_lock(&reconn_list.mutex);
 674
 675         for (reconn = TAILQ_FIRST(&reconn_list.head);
 676              reconn != NULL; reconn = next) {
 677                 next = TAILQ_NEXT(reconn, next);
 678
 679                 if (reconn->vsocket == vsocket) {
 680                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 681                         close(reconn->fd);
 682                         free(reconn);
 683                         found = true;
 684                         break;
 685                 }
 686         }
 687         pthread_mutex_unlock(&reconn_list.mutex);
 688         return found;
 689 }
 690
 691 /**
 692  * Unregister the specified vhost socket
 693  */
 694 int
 695 rte_vhost_driver_unregister(const char *path)
 696 {
 697         int i;
 698         int count;
 699         struct vhost_user_connection *conn, *next;
 700
 701         pthread_mutex_lock(&vhost_user.mutex);
 702
 703         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 704                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 705
 706                 if (!strcmp(vsocket->path, path)) {
 707                         if (vsocket->is_server) {
 708                                 fdset_del(&vhost_user.fdset, vsocket->listenfd);
 709                                 close(vsocket->listenfd);
 710                                 unlink(path);
 711                         } else if (vsocket->reconnect) {
 712                                 vhost_user_remove_reconnect(vsocket);
 713                         }
 714
 715                         pthread_mutex_lock(&vsocket->conn_mutex);
 716                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 717                              conn != NULL;
 718                              conn = next) {
 719                                 next = TAILQ_NEXT(conn, next);
 720
 721                                 fdset_del(&vhost_user.fdset, conn->connfd);
 722                                 RTE_LOG(INFO, VHOST_CONFIG,
 723                                         "free connfd = %d for device '%s'\n",
 724                                         conn->connfd, path);
 725                                 close(conn->connfd);
 726                                 vhost_destroy_device(conn->vid);
 727                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 728                                 free(conn);
 729                         }
 730                         pthread_mutex_unlock(&vsocket->conn_mutex);
 731
 732                         free(vsocket->path);
 733                         free(vsocket);
 734
 735                         count = --vhost_user.vsocket_cnt;
 736                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 737                         vhost_user.vsockets[count] = NULL;
 738                         pthread_mutex_unlock(&vhost_user.mutex);
 739
 740                         return 0;
 741                 }
 742         }
 743         pthread_mutex_unlock(&vhost_user.mutex);
 744
 745         return -1;
 746 }
 747
 748 /*
 749  * Register ops so that we can add/remove device to data core.
 750  */
 751 int
 752 rte_vhost_driver_callback_register(const char *path,
 753         struct virtio_net_device_ops const * const ops)
 754 {
 755         struct vhost_user_socket *vsocket;
 756
 757         pthread_mutex_lock(&vhost_user.mutex);
 758         vsocket = find_vhost_user_socket(path);
 759         if (vsocket)
 760                 vsocket->notify_ops = ops;
 761         pthread_mutex_unlock(&vhost_user.mutex);
 762
 763         return vsocket ? 0 : -1;
 764 }
 765
 766 struct virtio_net_device_ops const *
 767 vhost_driver_callback_get(const char *path)
 768 {
 769         struct vhost_user_socket *vsocket;
 770
 771         pthread_mutex_lock(&vhost_user.mutex);
 772         vsocket = find_vhost_user_socket(path);
 773         pthread_mutex_unlock(&vhost_user.mutex);
 774
 775         return vsocket ? vsocket->notify_ops : NULL;
 776 }
 777
 778 int
 779 rte_vhost_driver_session_start(void)
 780 {
 781         fdset_event_dispatch(&vhost_user.fdset);
 782         return 0;
 783 }