lib/librte_vhost/socket.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <stdbool.h>
   8 #include <limits.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <string.h>
  12 #include <sys/types.h>
  13 #include <sys/socket.h>
  14 #include <sys/un.h>
  15 #include <sys/queue.h>
  16 #include <errno.h>
  17 #include <fcntl.h>
  18 #include <pthread.h>
  19
  20 #include <rte_log.h>
  21
  22 #include "fd_man.h"
  23 #include "vhost.h"
  24 #include "vhost_user.h"
  25
  26
  27 TAILQ_HEAD(vhost_user_connection_list, vhost_user_connection);
  28
  29 /*
  30  * Every time rte_vhost_driver_register() is invoked, an associated
  31  * vhost_user_socket struct will be created.
  32  */
  33 struct vhost_user_socket {
  34         struct vhost_user_connection_list conn_list;
  35         pthread_mutex_t conn_mutex;
  36         char *path;
  37         int socket_fd;
  38         struct sockaddr_un un;
  39         bool is_server;
  40         bool reconnect;
  41         bool dequeue_zero_copy;
  42         bool iommu_support;
  43
  44         /*
  45          * The "supported_features" indicates the feature bits the
  46          * vhost driver supports. The "features" indicates the feature
  47          * bits after the rte_vhost_driver_features_disable/enable().
  48          * It is also the final feature bits used for vhost-user
  49          * features negotiation.
  50          */
  51         uint64_t supported_features;
  52         uint64_t features;
  53
  54         struct vhost_device_ops const *notify_ops;
  55 };
  56
  57 struct vhost_user_connection {
  58         struct vhost_user_socket *vsocket;
  59         int connfd;
  60         int vid;
  61
  62         TAILQ_ENTRY(vhost_user_connection) next;
  63 };
  64
  65 #define MAX_VHOST_SOCKET 1024
  66 struct vhost_user {
  67         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  68         struct fdset fdset;
  69         int vsocket_cnt;
  70         pthread_mutex_t mutex;
  71 };
  72
  73 #define MAX_VIRTIO_BACKLOG 128
  74
  75 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
  76 static void vhost_user_read_cb(int fd, void *dat, int *remove);
  77 static int create_unix_socket(struct vhost_user_socket *vsocket);
  78 static int vhost_user_start_client(struct vhost_user_socket *vsocket);
  79
  80 static struct vhost_user vhost_user = {
  81         .fdset = {
  82                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
  83                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
  84                 .num = 0
  85         },
  86         .vsocket_cnt = 0,
  87         .mutex = PTHREAD_MUTEX_INITIALIZER,
  88 };
  89
  90 /* return bytes# of read on success or negative val on failure. */
  91 int
  92 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
  93 {
  94         struct iovec iov;
  95         struct msghdr msgh;
  96         size_t fdsize = fd_num * sizeof(int);
  97         char control[CMSG_SPACE(fdsize)];
  98         struct cmsghdr *cmsg;
  99         int ret;
 100
 101         memset(&msgh, 0, sizeof(msgh));
 102         iov.iov_base = buf;
 103         iov.iov_len  = buflen;
 104
 105         msgh.msg_iov = &iov;
 106         msgh.msg_iovlen = 1;
 107         msgh.msg_control = control;
 108         msgh.msg_controllen = sizeof(control);
 109
 110         ret = recvmsg(sockfd, &msgh, 0);
 111         if (ret <= 0) {
 112                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 113                 return ret;
 114         }
 115
 116         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 117                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 118                 return -1;
 119         }
 120
 121         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 122                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 123                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 124                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 125                         memcpy(fds, CMSG_DATA(cmsg), fdsize);
 126                         break;
 127                 }
 128         }
 129
 130         return ret;
 131 }
 132
 133 int
 134 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 135 {
 136
 137         struct iovec iov;
 138         struct msghdr msgh;
 139         size_t fdsize = fd_num * sizeof(int);
 140         char control[CMSG_SPACE(fdsize)];
 141         struct cmsghdr *cmsg;
 142         int ret;
 143
 144         memset(&msgh, 0, sizeof(msgh));
 145         iov.iov_base = buf;
 146         iov.iov_len = buflen;
 147
 148         msgh.msg_iov = &iov;
 149         msgh.msg_iovlen = 1;
 150
 151         if (fds && fd_num > 0) {
 152                 msgh.msg_control = control;
 153                 msgh.msg_controllen = sizeof(control);
 154                 cmsg = CMSG_FIRSTHDR(&msgh);
 155                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 156                 cmsg->cmsg_level = SOL_SOCKET;
 157                 cmsg->cmsg_type = SCM_RIGHTS;
 158                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 159         } else {
 160                 msgh.msg_control = NULL;
 161                 msgh.msg_controllen = 0;
 162         }
 163
 164         do {
 165                 ret = sendmsg(sockfd, &msgh, 0);
 166         } while (ret < 0 && errno == EINTR);
 167
 168         if (ret < 0) {
 169                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 170                 return ret;
 171         }
 172
 173         return ret;
 174 }
 175
 176 static void
 177 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 178 {
 179         int vid;
 180         size_t size;
 181         struct vhost_user_connection *conn;
 182         int ret;
 183
 184         conn = malloc(sizeof(*conn));
 185         if (conn == NULL) {
 186                 close(fd);
 187                 return;
 188         }
 189
 190         vid = vhost_new_device();
 191         if (vid == -1) {
 192                 goto err;
 193         }
 194
 195         size = strnlen(vsocket->path, PATH_MAX);
 196         vhost_set_ifname(vid, vsocket->path, size);
 197
 198         if (vsocket->dequeue_zero_copy)
 199                 vhost_enable_dequeue_zero_copy(vid);
 200
 201         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 202
 203         if (vsocket->notify_ops->new_connection) {
 204                 ret = vsocket->notify_ops->new_connection(vid);
 205                 if (ret < 0) {
 206                         RTE_LOG(ERR, VHOST_CONFIG,
 207                                 "failed to add vhost user connection with fd %d\n",
 208                                 fd);
 209                         goto err;
 210                 }
 211         }
 212
 213         conn->connfd = fd;
 214         conn->vsocket = vsocket;
 215         conn->vid = vid;
 216         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 217                         NULL, conn);
 218         if (ret < 0) {
 219                 RTE_LOG(ERR, VHOST_CONFIG,
 220                         "failed to add fd %d into vhost server fdset\n",
 221                         fd);
 222
 223                 if (vsocket->notify_ops->destroy_connection)
 224                         vsocket->notify_ops->destroy_connection(conn->vid);
 225
 226                 goto err;
 227         }
 228
 229         pthread_mutex_lock(&vsocket->conn_mutex);
 230         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 231         pthread_mutex_unlock(&vsocket->conn_mutex);
 232         return;
 233
 234 err:
 235         free(conn);
 236         close(fd);
 237 }
 238
 239 /* call back when there is new vhost-user connection from client  */
 240 static void
 241 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 242 {
 243         struct vhost_user_socket *vsocket = dat;
 244
 245         fd = accept(fd, NULL, NULL);
 246         if (fd < 0)
 247                 return;
 248
 249         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 250         vhost_user_add_connection(fd, vsocket);
 251 }
 252
 253 static void
 254 vhost_user_read_cb(int connfd, void *dat, int *remove)
 255 {
 256         struct vhost_user_connection *conn = dat;
 257         struct vhost_user_socket *vsocket = conn->vsocket;
 258         int ret;
 259
 260         ret = vhost_user_msg_handler(conn->vid, connfd);
 261         if (ret < 0) {
 262                 close(connfd);
 263                 *remove = 1;
 264                 vhost_destroy_device(conn->vid);
 265
 266                 if (vsocket->notify_ops->destroy_connection)
 267                         vsocket->notify_ops->destroy_connection(conn->vid);
 268
 269                 pthread_mutex_lock(&vsocket->conn_mutex);
 270                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 271                 pthread_mutex_unlock(&vsocket->conn_mutex);
 272
 273                 free(conn);
 274
 275                 if (vsocket->reconnect) {
 276                         create_unix_socket(vsocket);
 277                         vhost_user_start_client(vsocket);
 278                 }
 279         }
 280 }
 281
 282 static int
 283 create_unix_socket(struct vhost_user_socket *vsocket)
 284 {
 285         int fd;
 286         struct sockaddr_un *un = &vsocket->un;
 287
 288         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 289         if (fd < 0)
 290                 return -1;
 291         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 292                 vsocket->is_server ? "server" : "client", fd);
 293
 294         if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 295                 RTE_LOG(ERR, VHOST_CONFIG,
 296                         "vhost-user: can't set nonblocking mode for socket, fd: "
 297                         "%d (%s)\n", fd, strerror(errno));
 298                 close(fd);
 299                 return -1;
 300         }
 301
 302         memset(un, 0, sizeof(*un));
 303         un->sun_family = AF_UNIX;
 304         strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
 305         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 306
 307         vsocket->socket_fd = fd;
 308         return 0;
 309 }
 310
 311 static int
 312 vhost_user_start_server(struct vhost_user_socket *vsocket)
 313 {
 314         int ret;
 315         int fd = vsocket->socket_fd;
 316         const char *path = vsocket->path;
 317
 318         ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 319         if (ret < 0) {
 320                 RTE_LOG(ERR, VHOST_CONFIG,
 321                         "failed to bind to %s: %s; remove it and try again\n",
 322                         path, strerror(errno));
 323                 goto err;
 324         }
 325         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 326
 327         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 328         if (ret < 0)
 329                 goto err;
 330
 331         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 332                   NULL, vsocket);
 333         if (ret < 0) {
 334                 RTE_LOG(ERR, VHOST_CONFIG,
 335                         "failed to add listen fd %d to vhost server fdset\n",
 336                         fd);
 337                 goto err;
 338         }
 339
 340         return 0;
 341
 342 err:
 343         close(fd);
 344         return -1;
 345 }
 346
 347 struct vhost_user_reconnect {
 348         struct sockaddr_un un;
 349         int fd;
 350         struct vhost_user_socket *vsocket;
 351
 352         TAILQ_ENTRY(vhost_user_reconnect) next;
 353 };
 354
 355 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 356 struct vhost_user_reconnect_list {
 357         struct vhost_user_reconnect_tailq_list head;
 358         pthread_mutex_t mutex;
 359 };
 360
 361 static struct vhost_user_reconnect_list reconn_list;
 362 static pthread_t reconn_tid;
 363
 364 static int
 365 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 366 {
 367         int ret, flags;
 368
 369         ret = connect(fd, un, sz);
 370         if (ret < 0 && errno != EISCONN)
 371                 return -1;
 372
 373         flags = fcntl(fd, F_GETFL, 0);
 374         if (flags < 0) {
 375                 RTE_LOG(ERR, VHOST_CONFIG,
 376                         "can't get flags for connfd %d\n", fd);
 377                 return -2;
 378         }
 379         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 380                 RTE_LOG(ERR, VHOST_CONFIG,
 381                                 "can't disable nonblocking on fd %d\n", fd);
 382                 return -2;
 383         }
 384         return 0;
 385 }
 386
 387 static void *
 388 vhost_user_client_reconnect(void *arg __rte_unused)
 389 {
 390         int ret;
 391         struct vhost_user_reconnect *reconn, *next;
 392
 393         while (1) {
 394                 pthread_mutex_lock(&reconn_list.mutex);
 395
 396                 /*
 397                  * An equal implementation of TAILQ_FOREACH_SAFE,
 398                  * which does not exist on all platforms.
 399                  */
 400                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 401                      reconn != NULL; reconn = next) {
 402                         next = TAILQ_NEXT(reconn, next);
 403
 404                         ret = vhost_user_connect_nonblock(reconn->fd,
 405                                                 (struct sockaddr *)&reconn->un,
 406                                                 sizeof(reconn->un));
 407                         if (ret == -2) {
 408                                 close(reconn->fd);
 409                                 RTE_LOG(ERR, VHOST_CONFIG,
 410                                         "reconnection for fd %d failed\n",
 411                                         reconn->fd);
 412                                 goto remove_fd;
 413                         }
 414                         if (ret == -1)
 415                                 continue;
 416
 417                         RTE_LOG(INFO, VHOST_CONFIG,
 418                                 "%s: connected\n", reconn->vsocket->path);
 419                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 420 remove_fd:
 421                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 422                         free(reconn);
 423                 }
 424
 425                 pthread_mutex_unlock(&reconn_list.mutex);
 426                 sleep(1);
 427         }
 428
 429         return NULL;
 430 }
 431
 432 static int
 433 vhost_user_reconnect_init(void)
 434 {
 435         int ret;
 436         char thread_name[RTE_MAX_THREAD_NAME_LEN];
 437
 438         ret = pthread_mutex_init(&reconn_list.mutex, NULL);
 439         if (ret < 0) {
 440                 RTE_LOG(ERR, VHOST_CONFIG, "failed to initialize mutex");
 441                 return ret;
 442         }
 443         TAILQ_INIT(&reconn_list.head);
 444
 445         ret = pthread_create(&reconn_tid, NULL,
 446                              vhost_user_client_reconnect, NULL);
 447         if (ret != 0) {
 448                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 449                 if (pthread_mutex_destroy(&reconn_list.mutex)) {
 450                         RTE_LOG(ERR, VHOST_CONFIG,
 451                                 "failed to destroy reconnect mutex");
 452                 }
 453         } else {
 454                 snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN,
 455                          "vhost-reconn");
 456
 457                 if (rte_thread_setname(reconn_tid, thread_name)) {
 458                         RTE_LOG(DEBUG, VHOST_CONFIG,
 459                                 "failed to set reconnect thread name");
 460                 }
 461         }
 462
 463         return ret;
 464 }
 465
 466 static int
 467 vhost_user_start_client(struct vhost_user_socket *vsocket)
 468 {
 469         int ret;
 470         int fd = vsocket->socket_fd;
 471         const char *path = vsocket->path;
 472         struct vhost_user_reconnect *reconn;
 473
 474         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
 475                                           sizeof(vsocket->un));
 476         if (ret == 0) {
 477                 vhost_user_add_connection(fd, vsocket);
 478                 return 0;
 479         }
 480
 481         RTE_LOG(WARNING, VHOST_CONFIG,
 482                 "failed to connect to %s: %s\n",
 483                 path, strerror(errno));
 484
 485         if (ret == -2 || !vsocket->reconnect) {
 486                 close(fd);
 487                 return -1;
 488         }
 489
 490         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 491         reconn = malloc(sizeof(*reconn));
 492         if (reconn == NULL) {
 493                 RTE_LOG(ERR, VHOST_CONFIG,
 494                         "failed to allocate memory for reconnect\n");
 495                 close(fd);
 496                 return -1;
 497         }
 498         reconn->un = vsocket->un;
 499         reconn->fd = fd;
 500         reconn->vsocket = vsocket;
 501         pthread_mutex_lock(&reconn_list.mutex);
 502         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 503         pthread_mutex_unlock(&reconn_list.mutex);
 504
 505         return 0;
 506 }
 507
 508 static struct vhost_user_socket *
 509 find_vhost_user_socket(const char *path)
 510 {
 511         int i;
 512
 513         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 514                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 515
 516                 if (!strcmp(vsocket->path, path))
 517                         return vsocket;
 518         }
 519
 520         return NULL;
 521 }
 522
 523 int
 524 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 525 {
 526         struct vhost_user_socket *vsocket;
 527
 528         pthread_mutex_lock(&vhost_user.mutex);
 529         vsocket = find_vhost_user_socket(path);
 530         if (vsocket)
 531                 vsocket->features &= ~features;
 532         pthread_mutex_unlock(&vhost_user.mutex);
 533
 534         return vsocket ? 0 : -1;
 535 }
 536
 537 int
 538 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 539 {
 540         struct vhost_user_socket *vsocket;
 541
 542         pthread_mutex_lock(&vhost_user.mutex);
 543         vsocket = find_vhost_user_socket(path);
 544         if (vsocket) {
 545                 if ((vsocket->supported_features & features) != features) {
 546                         /*
 547                          * trying to enable features the driver doesn't
 548                          * support.
 549                          */
 550                         pthread_mutex_unlock(&vhost_user.mutex);
 551                         return -1;
 552                 }
 553                 vsocket->features |= features;
 554         }
 555         pthread_mutex_unlock(&vhost_user.mutex);
 556
 557         return vsocket ? 0 : -1;
 558 }
 559
 560 int
 561 rte_vhost_driver_set_features(const char *path, uint64_t features)
 562 {
 563         struct vhost_user_socket *vsocket;
 564
 565         pthread_mutex_lock(&vhost_user.mutex);
 566         vsocket = find_vhost_user_socket(path);
 567         if (vsocket) {
 568                 vsocket->supported_features = features;
 569                 vsocket->features = features;
 570         }
 571         pthread_mutex_unlock(&vhost_user.mutex);
 572
 573         return vsocket ? 0 : -1;
 574 }
 575
 576 int
 577 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 578 {
 579         struct vhost_user_socket *vsocket;
 580
 581         pthread_mutex_lock(&vhost_user.mutex);
 582         vsocket = find_vhost_user_socket(path);
 583         if (vsocket)
 584                 *features = vsocket->features;
 585         pthread_mutex_unlock(&vhost_user.mutex);
 586
 587         if (!vsocket) {
 588                 RTE_LOG(ERR, VHOST_CONFIG,
 589                         "socket file %s is not registered yet.\n", path);
 590                 return -1;
 591         } else {
 592                 return 0;
 593         }
 594 }
 595
 596 /*
 597  * Register a new vhost-user socket; here we could act as server
 598  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 599  * is set.
 600  */
 601 int
 602 rte_vhost_driver_register(const char *path, uint64_t flags)
 603 {
 604         int ret = -1;
 605         struct vhost_user_socket *vsocket;
 606
 607         if (!path)
 608                 return -1;
 609
 610         pthread_mutex_lock(&vhost_user.mutex);
 611
 612         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 613                 RTE_LOG(ERR, VHOST_CONFIG,
 614                         "error: the number of vhost sockets reaches maximum\n");
 615                 goto out;
 616         }
 617
 618         vsocket = malloc(sizeof(struct vhost_user_socket));
 619         if (!vsocket)
 620                 goto out;
 621         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 622         vsocket->path = strdup(path);
 623         if (vsocket->path == NULL) {
 624                 RTE_LOG(ERR, VHOST_CONFIG,
 625                         "error: failed to copy socket path string\n");
 626                 free(vsocket);
 627                 goto out;
 628         }
 629         TAILQ_INIT(&vsocket->conn_list);
 630         ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
 631         if (ret) {
 632                 RTE_LOG(ERR, VHOST_CONFIG,
 633                         "error: failed to init connection mutex\n");
 634                 goto out_free;
 635         }
 636         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 637
 638         /*
 639          * Set the supported features correctly for the builtin vhost-user
 640          * net driver.
 641          *
 642          * Applications know nothing about features the builtin virtio net
 643          * driver (virtio_net.c) supports, thus it's not possible for them
 644          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 645          * we set it unconditionally. If the application want to implement
 646          * another vhost-user driver (say SCSI), it should call the
 647          * rte_vhost_driver_set_features(), which will overwrite following
 648          * two values.
 649          */
 650         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 651         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 652
 653         if (!(flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
 654                 vsocket->supported_features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 655                 vsocket->features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 656         }
 657
 658         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 659                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 660                 if (vsocket->reconnect && reconn_tid == 0) {
 661                         if (vhost_user_reconnect_init() != 0)
 662                                 goto out_mutex;
 663                 }
 664         } else {
 665                 vsocket->is_server = true;
 666         }
 667         ret = create_unix_socket(vsocket);
 668         if (ret < 0) {
 669                 goto out_mutex;
 670         }
 671
 672         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 673
 674         pthread_mutex_unlock(&vhost_user.mutex);
 675         return ret;
 676
 677 out_mutex:
 678         if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
 679                 RTE_LOG(ERR, VHOST_CONFIG,
 680                         "error: failed to destroy connection mutex\n");
 681         }
 682 out_free:
 683         free(vsocket->path);
 684         free(vsocket);
 685 out:
 686         pthread_mutex_unlock(&vhost_user.mutex);
 687
 688         return ret;
 689 }
 690
 691 static bool
 692 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 693 {
 694         int found = false;
 695         struct vhost_user_reconnect *reconn, *next;
 696
 697         pthread_mutex_lock(&reconn_list.mutex);
 698
 699         for (reconn = TAILQ_FIRST(&reconn_list.head);
 700              reconn != NULL; reconn = next) {
 701                 next = TAILQ_NEXT(reconn, next);
 702
 703                 if (reconn->vsocket == vsocket) {
 704                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 705                         close(reconn->fd);
 706                         free(reconn);
 707                         found = true;
 708                         break;
 709                 }
 710         }
 711         pthread_mutex_unlock(&reconn_list.mutex);
 712         return found;
 713 }
 714
 715 /**
 716  * Unregister the specified vhost socket
 717  */
 718 int
 719 rte_vhost_driver_unregister(const char *path)
 720 {
 721         int i;
 722         int count;
 723         struct vhost_user_connection *conn, *next;
 724
 725         pthread_mutex_lock(&vhost_user.mutex);
 726
 727         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 728                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 729
 730                 if (!strcmp(vsocket->path, path)) {
 731                         if (vsocket->is_server) {
 732                                 fdset_del(&vhost_user.fdset, vsocket->socket_fd);
 733                                 close(vsocket->socket_fd);
 734                                 unlink(path);
 735                         } else if (vsocket->reconnect) {
 736                                 vhost_user_remove_reconnect(vsocket);
 737                         }
 738
 739                         pthread_mutex_lock(&vsocket->conn_mutex);
 740                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 741                              conn != NULL;
 742                              conn = next) {
 743                                 next = TAILQ_NEXT(conn, next);
 744
 745                                 fdset_del(&vhost_user.fdset, conn->connfd);
 746                                 RTE_LOG(INFO, VHOST_CONFIG,
 747                                         "free connfd = %d for device '%s'\n",
 748                                         conn->connfd, path);
 749                                 close(conn->connfd);
 750                                 vhost_destroy_device(conn->vid);
 751                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 752                                 free(conn);
 753                         }
 754                         pthread_mutex_unlock(&vsocket->conn_mutex);
 755
 756                         pthread_mutex_destroy(&vsocket->conn_mutex);
 757                         free(vsocket->path);
 758                         free(vsocket);
 759
 760                         count = --vhost_user.vsocket_cnt;
 761                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 762                         vhost_user.vsockets[count] = NULL;
 763                         pthread_mutex_unlock(&vhost_user.mutex);
 764
 765                         return 0;
 766                 }
 767         }
 768         pthread_mutex_unlock(&vhost_user.mutex);
 769
 770         return -1;
 771 }
 772
 773 /*
 774  * Register ops so that we can add/remove device to data core.
 775  */
 776 int
 777 rte_vhost_driver_callback_register(const char *path,
 778         struct vhost_device_ops const * const ops)
 779 {
 780         struct vhost_user_socket *vsocket;
 781
 782         pthread_mutex_lock(&vhost_user.mutex);
 783         vsocket = find_vhost_user_socket(path);
 784         if (vsocket)
 785                 vsocket->notify_ops = ops;
 786         pthread_mutex_unlock(&vhost_user.mutex);
 787
 788         return vsocket ? 0 : -1;
 789 }
 790
 791 struct vhost_device_ops const *
 792 vhost_driver_callback_get(const char *path)
 793 {
 794         struct vhost_user_socket *vsocket;
 795
 796         pthread_mutex_lock(&vhost_user.mutex);
 797         vsocket = find_vhost_user_socket(path);
 798         pthread_mutex_unlock(&vhost_user.mutex);
 799
 800         return vsocket ? vsocket->notify_ops : NULL;
 801 }
 802
 803 int
 804 rte_vhost_driver_start(const char *path)
 805 {
 806         struct vhost_user_socket *vsocket;
 807         static pthread_t fdset_tid;
 808
 809         pthread_mutex_lock(&vhost_user.mutex);
 810         vsocket = find_vhost_user_socket(path);
 811         pthread_mutex_unlock(&vhost_user.mutex);
 812
 813         if (!vsocket)
 814                 return -1;
 815
 816         if (fdset_tid == 0) {
 817                 int ret = pthread_create(&fdset_tid, NULL, fdset_event_dispatch,
 818                                      &vhost_user.fdset);
 819                 if (ret != 0)
 820                         RTE_LOG(ERR, VHOST_CONFIG,
 821                                 "failed to create fdset handling thread");
 822         }
 823
 824         if (vsocket->is_server)
 825                 return vhost_user_start_server(vsocket);
 826         else
 827                 return vhost_user_start_client(vsocket);
 828 }