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         bool iommu_support;
  72
  73         /*
  74          * The "supported_features" indicates the feature bits the
  75          * vhost driver supports. The "features" indicates the feature
  76          * bits after the rte_vhost_driver_features_disable/enable().
  77          * It is also the final feature bits used for vhost-user
  78          * features negotiation.
  79          */
  80         uint64_t supported_features;
  81         uint64_t features;
  82
  83         struct vhost_device_ops const *notify_ops;
  84 };
  85
  86 struct vhost_user_connection {
  87         struct vhost_user_socket *vsocket;
  88         int connfd;
  89         int vid;
  90
  91         TAILQ_ENTRY(vhost_user_connection) next;
  92 };
  93
  94 #define MAX_VHOST_SOCKET 1024
  95 struct vhost_user {
  96         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  97         struct fdset fdset;
  98         int vsocket_cnt;
  99         pthread_mutex_t mutex;
 100 };
 101
 102 #define MAX_VIRTIO_BACKLOG 128
 103
 104 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
 105 static void vhost_user_read_cb(int fd, void *dat, int *remove);
 106 static int create_unix_socket(struct vhost_user_socket *vsocket);
 107 static int vhost_user_start_client(struct vhost_user_socket *vsocket);
 108
 109 static struct vhost_user vhost_user = {
 110         .fdset = {
 111                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
 112                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
 113                 .num = 0
 114         },
 115         .vsocket_cnt = 0,
 116         .mutex = PTHREAD_MUTEX_INITIALIZER,
 117 };
 118
 119 /* return bytes# of read on success or negative val on failure. */
 120 int
 121 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 122 {
 123         struct iovec iov;
 124         struct msghdr msgh;
 125         size_t fdsize = fd_num * sizeof(int);
 126         char control[CMSG_SPACE(fdsize)];
 127         struct cmsghdr *cmsg;
 128         int ret;
 129
 130         memset(&msgh, 0, sizeof(msgh));
 131         iov.iov_base = buf;
 132         iov.iov_len  = buflen;
 133
 134         msgh.msg_iov = &iov;
 135         msgh.msg_iovlen = 1;
 136         msgh.msg_control = control;
 137         msgh.msg_controllen = sizeof(control);
 138
 139         ret = recvmsg(sockfd, &msgh, 0);
 140         if (ret <= 0) {
 141                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 142                 return ret;
 143         }
 144
 145         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 146                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 147                 return -1;
 148         }
 149
 150         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 151                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 152                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 153                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 154                         memcpy(fds, CMSG_DATA(cmsg), fdsize);
 155                         break;
 156                 }
 157         }
 158
 159         return ret;
 160 }
 161
 162 int
 163 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 164 {
 165
 166         struct iovec iov;
 167         struct msghdr msgh;
 168         size_t fdsize = fd_num * sizeof(int);
 169         char control[CMSG_SPACE(fdsize)];
 170         struct cmsghdr *cmsg;
 171         int ret;
 172
 173         memset(&msgh, 0, sizeof(msgh));
 174         iov.iov_base = buf;
 175         iov.iov_len = buflen;
 176
 177         msgh.msg_iov = &iov;
 178         msgh.msg_iovlen = 1;
 179
 180         if (fds && fd_num > 0) {
 181                 msgh.msg_control = control;
 182                 msgh.msg_controllen = sizeof(control);
 183                 cmsg = CMSG_FIRSTHDR(&msgh);
 184                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 185                 cmsg->cmsg_level = SOL_SOCKET;
 186                 cmsg->cmsg_type = SCM_RIGHTS;
 187                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 188         } else {
 189                 msgh.msg_control = NULL;
 190                 msgh.msg_controllen = 0;
 191         }
 192
 193         do {
 194                 ret = sendmsg(sockfd, &msgh, 0);
 195         } while (ret < 0 && errno == EINTR);
 196
 197         if (ret < 0) {
 198                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 199                 return ret;
 200         }
 201
 202         return ret;
 203 }
 204
 205 static void
 206 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 207 {
 208         int vid;
 209         size_t size;
 210         struct vhost_user_connection *conn;
 211         int ret;
 212
 213         conn = malloc(sizeof(*conn));
 214         if (conn == NULL) {
 215                 close(fd);
 216                 return;
 217         }
 218
 219         vid = vhost_new_device();
 220         if (vid == -1) {
 221                 goto err;
 222         }
 223
 224         size = strnlen(vsocket->path, PATH_MAX);
 225         vhost_set_ifname(vid, vsocket->path, size);
 226
 227         if (vsocket->dequeue_zero_copy)
 228                 vhost_enable_dequeue_zero_copy(vid);
 229
 230         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 231
 232         if (vsocket->notify_ops->new_connection) {
 233                 ret = vsocket->notify_ops->new_connection(vid);
 234                 if (ret < 0) {
 235                         RTE_LOG(ERR, VHOST_CONFIG,
 236                                 "failed to add vhost user connection with fd %d\n",
 237                                 fd);
 238                         goto err;
 239                 }
 240         }
 241
 242         conn->connfd = fd;
 243         conn->vsocket = vsocket;
 244         conn->vid = vid;
 245         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 246                         NULL, conn);
 247         if (ret < 0) {
 248                 RTE_LOG(ERR, VHOST_CONFIG,
 249                         "failed to add fd %d into vhost server fdset\n",
 250                         fd);
 251
 252                 if (vsocket->notify_ops->destroy_connection)
 253                         vsocket->notify_ops->destroy_connection(conn->vid);
 254
 255                 goto err;
 256         }
 257
 258         pthread_mutex_lock(&vsocket->conn_mutex);
 259         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 260         pthread_mutex_unlock(&vsocket->conn_mutex);
 261         return;
 262
 263 err:
 264         free(conn);
 265         close(fd);
 266 }
 267
 268 /* call back when there is new vhost-user connection from client  */
 269 static void
 270 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 271 {
 272         struct vhost_user_socket *vsocket = dat;
 273
 274         fd = accept(fd, NULL, NULL);
 275         if (fd < 0)
 276                 return;
 277
 278         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 279         vhost_user_add_connection(fd, vsocket);
 280 }
 281
 282 static void
 283 vhost_user_read_cb(int connfd, void *dat, int *remove)
 284 {
 285         struct vhost_user_connection *conn = dat;
 286         struct vhost_user_socket *vsocket = conn->vsocket;
 287         int ret;
 288
 289         ret = vhost_user_msg_handler(conn->vid, connfd);
 290         if (ret < 0) {
 291                 close(connfd);
 292                 *remove = 1;
 293                 vhost_destroy_device(conn->vid);
 294
 295                 if (vsocket->notify_ops->destroy_connection)
 296                         vsocket->notify_ops->destroy_connection(conn->vid);
 297
 298                 pthread_mutex_lock(&vsocket->conn_mutex);
 299                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 300                 pthread_mutex_unlock(&vsocket->conn_mutex);
 301
 302                 free(conn);
 303
 304                 if (vsocket->reconnect) {
 305                         create_unix_socket(vsocket);
 306                         vhost_user_start_client(vsocket);
 307                 }
 308         }
 309 }
 310
 311 static int
 312 create_unix_socket(struct vhost_user_socket *vsocket)
 313 {
 314         int fd;
 315         struct sockaddr_un *un = &vsocket->un;
 316
 317         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 318         if (fd < 0)
 319                 return -1;
 320         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 321                 vsocket->is_server ? "server" : "client", fd);
 322
 323         if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 324                 RTE_LOG(ERR, VHOST_CONFIG,
 325                         "vhost-user: can't set nonblocking mode for socket, fd: "
 326                         "%d (%s)\n", fd, strerror(errno));
 327                 close(fd);
 328                 return -1;
 329         }
 330
 331         memset(un, 0, sizeof(*un));
 332         un->sun_family = AF_UNIX;
 333         strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
 334         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 335
 336         vsocket->socket_fd = fd;
 337         return 0;
 338 }
 339
 340 static int
 341 vhost_user_start_server(struct vhost_user_socket *vsocket)
 342 {
 343         int ret;
 344         int fd = vsocket->socket_fd;
 345         const char *path = vsocket->path;
 346
 347         ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 348         if (ret < 0) {
 349                 RTE_LOG(ERR, VHOST_CONFIG,
 350                         "failed to bind to %s: %s; remove it and try again\n",
 351                         path, strerror(errno));
 352                 goto err;
 353         }
 354         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 355
 356         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 357         if (ret < 0)
 358                 goto err;
 359
 360         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 361                   NULL, vsocket);
 362         if (ret < 0) {
 363                 RTE_LOG(ERR, VHOST_CONFIG,
 364                         "failed to add listen fd %d to vhost server fdset\n",
 365                         fd);
 366                 goto err;
 367         }
 368
 369         return 0;
 370
 371 err:
 372         close(fd);
 373         return -1;
 374 }
 375
 376 struct vhost_user_reconnect {
 377         struct sockaddr_un un;
 378         int fd;
 379         struct vhost_user_socket *vsocket;
 380
 381         TAILQ_ENTRY(vhost_user_reconnect) next;
 382 };
 383
 384 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 385 struct vhost_user_reconnect_list {
 386         struct vhost_user_reconnect_tailq_list head;
 387         pthread_mutex_t mutex;
 388 };
 389
 390 static struct vhost_user_reconnect_list reconn_list;
 391 static pthread_t reconn_tid;
 392
 393 static int
 394 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 395 {
 396         int ret, flags;
 397
 398         ret = connect(fd, un, sz);
 399         if (ret < 0 && errno != EISCONN)
 400                 return -1;
 401
 402         flags = fcntl(fd, F_GETFL, 0);
 403         if (flags < 0) {
 404                 RTE_LOG(ERR, VHOST_CONFIG,
 405                         "can't get flags for connfd %d\n", fd);
 406                 return -2;
 407         }
 408         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 409                 RTE_LOG(ERR, VHOST_CONFIG,
 410                                 "can't disable nonblocking on fd %d\n", fd);
 411                 return -2;
 412         }
 413         return 0;
 414 }
 415
 416 static void *
 417 vhost_user_client_reconnect(void *arg __rte_unused)
 418 {
 419         int ret;
 420         struct vhost_user_reconnect *reconn, *next;
 421
 422         while (1) {
 423                 pthread_mutex_lock(&reconn_list.mutex);
 424
 425                 /*
 426                  * An equal implementation of TAILQ_FOREACH_SAFE,
 427                  * which does not exist on all platforms.
 428                  */
 429                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 430                      reconn != NULL; reconn = next) {
 431                         next = TAILQ_NEXT(reconn, next);
 432
 433                         ret = vhost_user_connect_nonblock(reconn->fd,
 434                                                 (struct sockaddr *)&reconn->un,
 435                                                 sizeof(reconn->un));
 436                         if (ret == -2) {
 437                                 close(reconn->fd);
 438                                 RTE_LOG(ERR, VHOST_CONFIG,
 439                                         "reconnection for fd %d failed\n",
 440                                         reconn->fd);
 441                                 goto remove_fd;
 442                         }
 443                         if (ret == -1)
 444                                 continue;
 445
 446                         RTE_LOG(INFO, VHOST_CONFIG,
 447                                 "%s: connected\n", reconn->vsocket->path);
 448                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 449 remove_fd:
 450                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 451                         free(reconn);
 452                 }
 453
 454                 pthread_mutex_unlock(&reconn_list.mutex);
 455                 sleep(1);
 456         }
 457
 458         return NULL;
 459 }
 460
 461 static int
 462 vhost_user_reconnect_init(void)
 463 {
 464         int ret;
 465
 466         ret = pthread_mutex_init(&reconn_list.mutex, NULL);
 467         if (ret < 0) {
 468                 RTE_LOG(ERR, VHOST_CONFIG, "failed to initialize mutex");
 469                 return ret;
 470         }
 471         TAILQ_INIT(&reconn_list.head);
 472
 473         ret = pthread_create(&reconn_tid, NULL,
 474                              vhost_user_client_reconnect, NULL);
 475         if (ret != 0) {
 476                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 477                 if (pthread_mutex_destroy(&reconn_list.mutex)) {
 478                         RTE_LOG(ERR, VHOST_CONFIG,
 479                                 "failed to destroy reconnect mutex");
 480                 }
 481         }
 482
 483         return ret;
 484 }
 485
 486 static int
 487 vhost_user_start_client(struct vhost_user_socket *vsocket)
 488 {
 489         int ret;
 490         int fd = vsocket->socket_fd;
 491         const char *path = vsocket->path;
 492         struct vhost_user_reconnect *reconn;
 493
 494         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
 495                                           sizeof(vsocket->un));
 496         if (ret == 0) {
 497                 vhost_user_add_connection(fd, vsocket);
 498                 return 0;
 499         }
 500
 501         RTE_LOG(WARNING, VHOST_CONFIG,
 502                 "failed to connect to %s: %s\n",
 503                 path, strerror(errno));
 504
 505         if (ret == -2 || !vsocket->reconnect) {
 506                 close(fd);
 507                 return -1;
 508         }
 509
 510         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 511         reconn = malloc(sizeof(*reconn));
 512         if (reconn == NULL) {
 513                 RTE_LOG(ERR, VHOST_CONFIG,
 514                         "failed to allocate memory for reconnect\n");
 515                 close(fd);
 516                 return -1;
 517         }
 518         reconn->un = vsocket->un;
 519         reconn->fd = fd;
 520         reconn->vsocket = vsocket;
 521         pthread_mutex_lock(&reconn_list.mutex);
 522         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 523         pthread_mutex_unlock(&reconn_list.mutex);
 524
 525         return 0;
 526 }
 527
 528 static struct vhost_user_socket *
 529 find_vhost_user_socket(const char *path)
 530 {
 531         int i;
 532
 533         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 534                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 535
 536                 if (!strcmp(vsocket->path, path))
 537                         return vsocket;
 538         }
 539
 540         return NULL;
 541 }
 542
 543 int
 544 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 545 {
 546         struct vhost_user_socket *vsocket;
 547
 548         pthread_mutex_lock(&vhost_user.mutex);
 549         vsocket = find_vhost_user_socket(path);
 550         if (vsocket)
 551                 vsocket->features &= ~features;
 552         pthread_mutex_unlock(&vhost_user.mutex);
 553
 554         return vsocket ? 0 : -1;
 555 }
 556
 557 int
 558 rte_vhost_driver_enable_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                 if ((vsocket->supported_features & features) != features) {
 566                         /*
 567                          * trying to enable features the driver doesn't
 568                          * support.
 569                          */
 570                         pthread_mutex_unlock(&vhost_user.mutex);
 571                         return -1;
 572                 }
 573                 vsocket->features |= features;
 574         }
 575         pthread_mutex_unlock(&vhost_user.mutex);
 576
 577         return vsocket ? 0 : -1;
 578 }
 579
 580 int
 581 rte_vhost_driver_set_features(const char *path, uint64_t features)
 582 {
 583         struct vhost_user_socket *vsocket;
 584
 585         pthread_mutex_lock(&vhost_user.mutex);
 586         vsocket = find_vhost_user_socket(path);
 587         if (vsocket) {
 588                 vsocket->supported_features = features;
 589                 vsocket->features = features;
 590         }
 591         pthread_mutex_unlock(&vhost_user.mutex);
 592
 593         return vsocket ? 0 : -1;
 594 }
 595
 596 int
 597 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 598 {
 599         struct vhost_user_socket *vsocket;
 600
 601         pthread_mutex_lock(&vhost_user.mutex);
 602         vsocket = find_vhost_user_socket(path);
 603         if (vsocket)
 604                 *features = vsocket->features;
 605         pthread_mutex_unlock(&vhost_user.mutex);
 606
 607         if (!vsocket) {
 608                 RTE_LOG(ERR, VHOST_CONFIG,
 609                         "socket file %s is not registered yet.\n", path);
 610                 return -1;
 611         } else {
 612                 return 0;
 613         }
 614 }
 615
 616 /*
 617  * Register a new vhost-user socket; here we could act as server
 618  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 619  * is set.
 620  */
 621 int
 622 rte_vhost_driver_register(const char *path, uint64_t flags)
 623 {
 624         int ret = -1;
 625         struct vhost_user_socket *vsocket;
 626
 627         if (!path)
 628                 return -1;
 629
 630         pthread_mutex_lock(&vhost_user.mutex);
 631
 632         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 633                 RTE_LOG(ERR, VHOST_CONFIG,
 634                         "error: the number of vhost sockets reaches maximum\n");
 635                 goto out;
 636         }
 637
 638         vsocket = malloc(sizeof(struct vhost_user_socket));
 639         if (!vsocket)
 640                 goto out;
 641         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 642         vsocket->path = strdup(path);
 643         if (vsocket->path == NULL) {
 644                 RTE_LOG(ERR, VHOST_CONFIG,
 645                         "error: failed to copy socket path string\n");
 646                 free(vsocket);
 647                 goto out;
 648         }
 649         TAILQ_INIT(&vsocket->conn_list);
 650         ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
 651         if (ret) {
 652                 RTE_LOG(ERR, VHOST_CONFIG,
 653                         "error: failed to init connection mutex\n");
 654                 goto out_free;
 655         }
 656         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 657
 658         /*
 659          * Set the supported features correctly for the builtin vhost-user
 660          * net driver.
 661          *
 662          * Applications know nothing about features the builtin virtio net
 663          * driver (virtio_net.c) supports, thus it's not possible for them
 664          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 665          * we set it unconditionally. If the application want to implement
 666          * another vhost-user driver (say SCSI), it should call the
 667          * rte_vhost_driver_set_features(), which will overwrite following
 668          * two values.
 669          */
 670         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 671         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 672
 673         if (!(flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
 674                 vsocket->supported_features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 675                 vsocket->features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 676         }
 677
 678         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 679                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 680                 if (vsocket->reconnect && reconn_tid == 0) {
 681                         if (vhost_user_reconnect_init() != 0)
 682                                 goto out_mutex;
 683                 }
 684         } else {
 685                 vsocket->is_server = true;
 686         }
 687         ret = create_unix_socket(vsocket);
 688         if (ret < 0) {
 689                 goto out_mutex;
 690         }
 691
 692         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 693
 694         pthread_mutex_unlock(&vhost_user.mutex);
 695         return ret;
 696
 697 out_mutex:
 698         if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
 699                 RTE_LOG(ERR, VHOST_CONFIG,
 700                         "error: failed to destroy connection mutex\n");
 701         }
 702 out_free:
 703         free(vsocket->path);
 704         free(vsocket);
 705 out:
 706         pthread_mutex_unlock(&vhost_user.mutex);
 707
 708         return ret;
 709 }
 710
 711 static bool
 712 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 713 {
 714         int found = false;
 715         struct vhost_user_reconnect *reconn, *next;
 716
 717         pthread_mutex_lock(&reconn_list.mutex);
 718
 719         for (reconn = TAILQ_FIRST(&reconn_list.head);
 720              reconn != NULL; reconn = next) {
 721                 next = TAILQ_NEXT(reconn, next);
 722
 723                 if (reconn->vsocket == vsocket) {
 724                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 725                         close(reconn->fd);
 726                         free(reconn);
 727                         found = true;
 728                         break;
 729                 }
 730         }
 731         pthread_mutex_unlock(&reconn_list.mutex);
 732         return found;
 733 }
 734
 735 /**
 736  * Unregister the specified vhost socket
 737  */
 738 int
 739 rte_vhost_driver_unregister(const char *path)
 740 {
 741         int i;
 742         int count;
 743         struct vhost_user_connection *conn, *next;
 744
 745         pthread_mutex_lock(&vhost_user.mutex);
 746
 747         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 748                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 749
 750                 if (!strcmp(vsocket->path, path)) {
 751                         if (vsocket->is_server) {
 752                                 fdset_del(&vhost_user.fdset, vsocket->socket_fd);
 753                                 close(vsocket->socket_fd);
 754                                 unlink(path);
 755                         } else if (vsocket->reconnect) {
 756                                 vhost_user_remove_reconnect(vsocket);
 757                         }
 758
 759                         pthread_mutex_lock(&vsocket->conn_mutex);
 760                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 761                              conn != NULL;
 762                              conn = next) {
 763                                 next = TAILQ_NEXT(conn, next);
 764
 765                                 fdset_del(&vhost_user.fdset, conn->connfd);
 766                                 RTE_LOG(INFO, VHOST_CONFIG,
 767                                         "free connfd = %d for device '%s'\n",
 768                                         conn->connfd, path);
 769                                 close(conn->connfd);
 770                                 vhost_destroy_device(conn->vid);
 771                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 772                                 free(conn);
 773                         }
 774                         pthread_mutex_unlock(&vsocket->conn_mutex);
 775
 776                         pthread_mutex_destroy(&vsocket->conn_mutex);
 777                         free(vsocket->path);
 778                         free(vsocket);
 779
 780                         count = --vhost_user.vsocket_cnt;
 781                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
 782                         vhost_user.vsockets[count] = NULL;
 783                         pthread_mutex_unlock(&vhost_user.mutex);
 784
 785                         return 0;
 786                 }
 787         }
 788         pthread_mutex_unlock(&vhost_user.mutex);
 789
 790         return -1;
 791 }
 792
 793 /*
 794  * Register ops so that we can add/remove device to data core.
 795  */
 796 int
 797 rte_vhost_driver_callback_register(const char *path,
 798         struct vhost_device_ops const * const ops)
 799 {
 800         struct vhost_user_socket *vsocket;
 801
 802         pthread_mutex_lock(&vhost_user.mutex);
 803         vsocket = find_vhost_user_socket(path);
 804         if (vsocket)
 805                 vsocket->notify_ops = ops;
 806         pthread_mutex_unlock(&vhost_user.mutex);
 807
 808         return vsocket ? 0 : -1;
 809 }
 810
 811 struct vhost_device_ops const *
 812 vhost_driver_callback_get(const char *path)
 813 {
 814         struct vhost_user_socket *vsocket;
 815
 816         pthread_mutex_lock(&vhost_user.mutex);
 817         vsocket = find_vhost_user_socket(path);
 818         pthread_mutex_unlock(&vhost_user.mutex);
 819
 820         return vsocket ? vsocket->notify_ops : NULL;
 821 }
 822
 823 int
 824 rte_vhost_driver_start(const char *path)
 825 {
 826         struct vhost_user_socket *vsocket;
 827         static pthread_t fdset_tid;
 828
 829         pthread_mutex_lock(&vhost_user.mutex);
 830         vsocket = find_vhost_user_socket(path);
 831         pthread_mutex_unlock(&vhost_user.mutex);
 832
 833         if (!vsocket)
 834                 return -1;
 835
 836         if (fdset_tid == 0) {
 837                 int ret = pthread_create(&fdset_tid, NULL, fdset_event_dispatch,
 838                                      &vhost_user.fdset);
 839                 if (ret != 0)
 840                         RTE_LOG(ERR, VHOST_CONFIG,
 841                                 "failed to create fdset handling thread");
 842         }
 843
 844         if (vsocket->is_server)
 845                 return vhost_user_start_server(vsocket);
 846         else
 847                 return vhost_user_start_client(vsocket);
 848 }