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 <limits.h>
   8 #include <stdlib.h>
   9 #include <unistd.h>
  10 #include <string.h>
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13 #include <sys/un.h>
  14 #include <sys/queue.h>
  15 #include <errno.h>
  16 #include <fcntl.h>
  17 #include <pthread.h>
  18
  19 #include <rte_log.h>
  20
  21 #include "fd_man.h"
  22 #include "vhost.h"
  23 #include "vhost_user.h"
  24
  25
  26 TAILQ_HEAD(vhost_user_connection_list, vhost_user_connection);
  27
  28 /*
  29  * Every time rte_vhost_driver_register() is invoked, an associated
  30  * vhost_user_socket struct will be created.
  31  */
  32 struct vhost_user_socket {
  33         struct vhost_user_connection_list conn_list;
  34         pthread_mutex_t conn_mutex;
  35         char *path;
  36         int socket_fd;
  37         struct sockaddr_un un;
  38         bool is_server;
  39         bool reconnect;
  40         bool dequeue_zero_copy;
  41         bool iommu_support;
  42         bool use_builtin_virtio_net;
  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         uint64_t protocol_features;
  55
  56         /*
  57          * Device id to identify a specific backend device.
  58          * It's set to -1 for the default software implementation.
  59          * If valid, one socket can have 1 connection only.
  60          */
  61         int vdpa_dev_id;
  62
  63         struct vhost_device_ops const *notify_ops;
  64 };
  65
  66 struct vhost_user_connection {
  67         struct vhost_user_socket *vsocket;
  68         int connfd;
  69         int vid;
  70
  71         TAILQ_ENTRY(vhost_user_connection) next;
  72 };
  73
  74 #define MAX_VHOST_SOCKET 1024
  75 struct vhost_user {
  76         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  77         struct fdset fdset;
  78         int vsocket_cnt;
  79         pthread_mutex_t mutex;
  80 };
  81
  82 #define MAX_VIRTIO_BACKLOG 128
  83
  84 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
  85 static void vhost_user_read_cb(int fd, void *dat, int *remove);
  86 static int create_unix_socket(struct vhost_user_socket *vsocket);
  87 static int vhost_user_start_client(struct vhost_user_socket *vsocket);
  88
  89 static struct vhost_user vhost_user = {
  90         .fdset = {
  91                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
  92                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
  93                 .fd_pooling_mutex = PTHREAD_MUTEX_INITIALIZER,
  94                 .num = 0
  95         },
  96         .vsocket_cnt = 0,
  97         .mutex = PTHREAD_MUTEX_INITIALIZER,
  98 };
  99
 100 /*
 101  * return bytes# of read on success or negative val on failure. Update fdnum
 102  * with number of fds read.
 103  */
 104 int
 105 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds,
 106                 int *fd_num)
 107 {
 108         struct iovec iov;
 109         struct msghdr msgh;
 110         char control[CMSG_SPACE(max_fds * sizeof(int))];
 111         struct cmsghdr *cmsg;
 112         int got_fds = 0;
 113         int ret;
 114
 115         *fd_num = 0;
 116
 117         memset(&msgh, 0, sizeof(msgh));
 118         iov.iov_base = buf;
 119         iov.iov_len  = buflen;
 120
 121         msgh.msg_iov = &iov;
 122         msgh.msg_iovlen = 1;
 123         msgh.msg_control = control;
 124         msgh.msg_controllen = sizeof(control);
 125
 126         ret = recvmsg(sockfd, &msgh, 0);
 127         if (ret <= 0) {
 128                 RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
 129                 return ret;
 130         }
 131
 132         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 133                 RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
 134                 return -1;
 135         }
 136
 137         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 138                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 139                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 140                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 141                         got_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
 142                         *fd_num = got_fds;
 143                         memcpy(fds, CMSG_DATA(cmsg), got_fds * sizeof(int));
 144                         break;
 145                 }
 146         }
 147
 148         /* Clear out unused file descriptors */
 149         while (got_fds < max_fds)
 150                 fds[got_fds++] = -1;
 151
 152         return ret;
 153 }
 154
 155 int
 156 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 157 {
 158
 159         struct iovec iov;
 160         struct msghdr msgh;
 161         size_t fdsize = fd_num * sizeof(int);
 162         char control[CMSG_SPACE(fdsize)];
 163         struct cmsghdr *cmsg;
 164         int ret;
 165
 166         memset(&msgh, 0, sizeof(msgh));
 167         iov.iov_base = buf;
 168         iov.iov_len = buflen;
 169
 170         msgh.msg_iov = &iov;
 171         msgh.msg_iovlen = 1;
 172
 173         if (fds && fd_num > 0) {
 174                 msgh.msg_control = control;
 175                 msgh.msg_controllen = sizeof(control);
 176                 cmsg = CMSG_FIRSTHDR(&msgh);
 177                 if (cmsg == NULL) {
 178                         RTE_LOG(ERR, VHOST_CONFIG, "cmsg == NULL\n");
 179                         errno = EINVAL;
 180                         return -1;
 181                 }
 182                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 183                 cmsg->cmsg_level = SOL_SOCKET;
 184                 cmsg->cmsg_type = SCM_RIGHTS;
 185                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 186         } else {
 187                 msgh.msg_control = NULL;
 188                 msgh.msg_controllen = 0;
 189         }
 190
 191         do {
 192                 ret = sendmsg(sockfd, &msgh, MSG_NOSIGNAL);
 193         } while (ret < 0 && errno == EINTR);
 194
 195         if (ret < 0) {
 196                 RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
 197                 return ret;
 198         }
 199
 200         return ret;
 201 }
 202
 203 static void
 204 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 205 {
 206         int vid;
 207         size_t size;
 208         struct vhost_user_connection *conn;
 209         int ret;
 210
 211         if (vsocket == NULL)
 212                 return;
 213
 214         conn = malloc(sizeof(*conn));
 215         if (conn == NULL) {
 216                 close(fd);
 217                 return;
 218         }
 219
 220         vid = vhost_new_device();
 221         if (vid == -1) {
 222                 goto err;
 223         }
 224
 225         size = strnlen(vsocket->path, PATH_MAX);
 226         vhost_set_ifname(vid, vsocket->path, size);
 227
 228         vhost_set_builtin_virtio_net(vid, vsocket->use_builtin_virtio_net);
 229
 230         vhost_attach_vdpa_device(vid, vsocket->vdpa_dev_id);
 231
 232         if (vsocket->dequeue_zero_copy)
 233                 vhost_enable_dequeue_zero_copy(vid);
 234
 235         RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
 236
 237         if (vsocket->notify_ops->new_connection) {
 238                 ret = vsocket->notify_ops->new_connection(vid);
 239                 if (ret < 0) {
 240                         RTE_LOG(ERR, VHOST_CONFIG,
 241                                 "failed to add vhost user connection with fd %d\n",
 242                                 fd);
 243                         goto err_cleanup;
 244                 }
 245         }
 246
 247         conn->connfd = fd;
 248         conn->vsocket = vsocket;
 249         conn->vid = vid;
 250         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 251                         NULL, conn);
 252         if (ret < 0) {
 253                 RTE_LOG(ERR, VHOST_CONFIG,
 254                         "failed to add fd %d into vhost server fdset\n",
 255                         fd);
 256
 257                 if (vsocket->notify_ops->destroy_connection)
 258                         vsocket->notify_ops->destroy_connection(conn->vid);
 259
 260                 goto err_cleanup;
 261         }
 262
 263         pthread_mutex_lock(&vsocket->conn_mutex);
 264         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 265         pthread_mutex_unlock(&vsocket->conn_mutex);
 266
 267         fdset_pipe_notify(&vhost_user.fdset);
 268         return;
 269
 270 err_cleanup:
 271         vhost_destroy_device(vid);
 272 err:
 273         free(conn);
 274         close(fd);
 275 }
 276
 277 /* call back when there is new vhost-user connection from client  */
 278 static void
 279 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 280 {
 281         struct vhost_user_socket *vsocket = dat;
 282
 283         fd = accept(fd, NULL, NULL);
 284         if (fd < 0)
 285                 return;
 286
 287         RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
 288         vhost_user_add_connection(fd, vsocket);
 289 }
 290
 291 static void
 292 vhost_user_read_cb(int connfd, void *dat, int *remove)
 293 {
 294         struct vhost_user_connection *conn = dat;
 295         struct vhost_user_socket *vsocket = conn->vsocket;
 296         int ret;
 297
 298         ret = vhost_user_msg_handler(conn->vid, connfd);
 299         if (ret < 0) {
 300                 close(connfd);
 301                 *remove = 1;
 302                 vhost_destroy_device(conn->vid);
 303
 304                 if (vsocket->notify_ops->destroy_connection)
 305                         vsocket->notify_ops->destroy_connection(conn->vid);
 306
 307                 pthread_mutex_lock(&vsocket->conn_mutex);
 308                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 309                 pthread_mutex_unlock(&vsocket->conn_mutex);
 310
 311                 free(conn);
 312
 313                 if (vsocket->reconnect) {
 314                         create_unix_socket(vsocket);
 315                         vhost_user_start_client(vsocket);
 316                 }
 317         }
 318 }
 319
 320 static int
 321 create_unix_socket(struct vhost_user_socket *vsocket)
 322 {
 323         int fd;
 324         struct sockaddr_un *un = &vsocket->un;
 325
 326         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 327         if (fd < 0)
 328                 return -1;
 329         RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
 330                 vsocket->is_server ? "server" : "client", fd);
 331
 332         if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 333                 RTE_LOG(ERR, VHOST_CONFIG,
 334                         "vhost-user: can't set nonblocking mode for socket, fd: "
 335                         "%d (%s)\n", fd, strerror(errno));
 336                 close(fd);
 337                 return -1;
 338         }
 339
 340         memset(un, 0, sizeof(*un));
 341         un->sun_family = AF_UNIX;
 342         strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
 343         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 344
 345         vsocket->socket_fd = fd;
 346         return 0;
 347 }
 348
 349 static int
 350 vhost_user_start_server(struct vhost_user_socket *vsocket)
 351 {
 352         int ret;
 353         int fd = vsocket->socket_fd;
 354         const char *path = vsocket->path;
 355
 356         /*
 357          * bind () may fail if the socket file with the same name already
 358          * exists. But the library obviously should not delete the file
 359          * provided by the user, since we can not be sure that it is not
 360          * being used by other applications. Moreover, many applications form
 361          * socket names based on user input, which is prone to errors.
 362          *
 363          * The user must ensure that the socket does not exist before
 364          * registering the vhost driver in server mode.
 365          */
 366         ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 367         if (ret < 0) {
 368                 RTE_LOG(ERR, VHOST_CONFIG,
 369                         "failed to bind to %s: %s; remove it and try again\n",
 370                         path, strerror(errno));
 371                 goto err;
 372         }
 373         RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
 374
 375         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 376         if (ret < 0)
 377                 goto err;
 378
 379         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 380                   NULL, vsocket);
 381         if (ret < 0) {
 382                 RTE_LOG(ERR, VHOST_CONFIG,
 383                         "failed to add listen fd %d to vhost server fdset\n",
 384                         fd);
 385                 goto err;
 386         }
 387
 388         return 0;
 389
 390 err:
 391         close(fd);
 392         return -1;
 393 }
 394
 395 struct vhost_user_reconnect {
 396         struct sockaddr_un un;
 397         int fd;
 398         struct vhost_user_socket *vsocket;
 399
 400         TAILQ_ENTRY(vhost_user_reconnect) next;
 401 };
 402
 403 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 404 struct vhost_user_reconnect_list {
 405         struct vhost_user_reconnect_tailq_list head;
 406         pthread_mutex_t mutex;
 407 };
 408
 409 static struct vhost_user_reconnect_list reconn_list;
 410 static pthread_t reconn_tid;
 411
 412 static int
 413 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 414 {
 415         int ret, flags;
 416
 417         ret = connect(fd, un, sz);
 418         if (ret < 0 && errno != EISCONN)
 419                 return -1;
 420
 421         flags = fcntl(fd, F_GETFL, 0);
 422         if (flags < 0) {
 423                 RTE_LOG(ERR, VHOST_CONFIG,
 424                         "can't get flags for connfd %d\n", fd);
 425                 return -2;
 426         }
 427         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 428                 RTE_LOG(ERR, VHOST_CONFIG,
 429                                 "can't disable nonblocking on fd %d\n", fd);
 430                 return -2;
 431         }
 432         return 0;
 433 }
 434
 435 static void *
 436 vhost_user_client_reconnect(void *arg __rte_unused)
 437 {
 438         int ret;
 439         struct vhost_user_reconnect *reconn, *next;
 440
 441         while (1) {
 442                 pthread_mutex_lock(&reconn_list.mutex);
 443
 444                 /*
 445                  * An equal implementation of TAILQ_FOREACH_SAFE,
 446                  * which does not exist on all platforms.
 447                  */
 448                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 449                      reconn != NULL; reconn = next) {
 450                         next = TAILQ_NEXT(reconn, next);
 451
 452                         ret = vhost_user_connect_nonblock(reconn->fd,
 453                                                 (struct sockaddr *)&reconn->un,
 454                                                 sizeof(reconn->un));
 455                         if (ret == -2) {
 456                                 close(reconn->fd);
 457                                 RTE_LOG(ERR, VHOST_CONFIG,
 458                                         "reconnection for fd %d failed\n",
 459                                         reconn->fd);
 460                                 goto remove_fd;
 461                         }
 462                         if (ret == -1)
 463                                 continue;
 464
 465                         RTE_LOG(INFO, VHOST_CONFIG,
 466                                 "%s: connected\n", reconn->vsocket->path);
 467                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 468 remove_fd:
 469                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 470                         free(reconn);
 471                 }
 472
 473                 pthread_mutex_unlock(&reconn_list.mutex);
 474                 sleep(1);
 475         }
 476
 477         return NULL;
 478 }
 479
 480 static int
 481 vhost_user_reconnect_init(void)
 482 {
 483         int ret;
 484
 485         ret = pthread_mutex_init(&reconn_list.mutex, NULL);
 486         if (ret < 0) {
 487                 RTE_LOG(ERR, VHOST_CONFIG, "failed to initialize mutex");
 488                 return ret;
 489         }
 490         TAILQ_INIT(&reconn_list.head);
 491
 492         ret = rte_ctrl_thread_create(&reconn_tid, "vhost_reconn", NULL,
 493                              vhost_user_client_reconnect, NULL);
 494         if (ret != 0) {
 495                 RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
 496                 if (pthread_mutex_destroy(&reconn_list.mutex)) {
 497                         RTE_LOG(ERR, VHOST_CONFIG,
 498                                 "failed to destroy reconnect mutex");
 499                 }
 500         }
 501
 502         return ret;
 503 }
 504
 505 static int
 506 vhost_user_start_client(struct vhost_user_socket *vsocket)
 507 {
 508         int ret;
 509         int fd = vsocket->socket_fd;
 510         const char *path = vsocket->path;
 511         struct vhost_user_reconnect *reconn;
 512
 513         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
 514                                           sizeof(vsocket->un));
 515         if (ret == 0) {
 516                 vhost_user_add_connection(fd, vsocket);
 517                 return 0;
 518         }
 519
 520         RTE_LOG(WARNING, VHOST_CONFIG,
 521                 "failed to connect to %s: %s\n",
 522                 path, strerror(errno));
 523
 524         if (ret == -2 || !vsocket->reconnect) {
 525                 close(fd);
 526                 return -1;
 527         }
 528
 529         RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
 530         reconn = malloc(sizeof(*reconn));
 531         if (reconn == NULL) {
 532                 RTE_LOG(ERR, VHOST_CONFIG,
 533                         "failed to allocate memory for reconnect\n");
 534                 close(fd);
 535                 return -1;
 536         }
 537         reconn->un = vsocket->un;
 538         reconn->fd = fd;
 539         reconn->vsocket = vsocket;
 540         pthread_mutex_lock(&reconn_list.mutex);
 541         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 542         pthread_mutex_unlock(&reconn_list.mutex);
 543
 544         return 0;
 545 }
 546
 547 static struct vhost_user_socket *
 548 find_vhost_user_socket(const char *path)
 549 {
 550         int i;
 551
 552         if (path == NULL)
 553                 return NULL;
 554
 555         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 556                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 557
 558                 if (!strcmp(vsocket->path, path))
 559                         return vsocket;
 560         }
 561
 562         return NULL;
 563 }
 564
 565 int
 566 rte_vhost_driver_attach_vdpa_device(const char *path, int did)
 567 {
 568         struct vhost_user_socket *vsocket;
 569
 570         if (rte_vdpa_get_device(did) == NULL || path == NULL)
 571                 return -1;
 572
 573         pthread_mutex_lock(&vhost_user.mutex);
 574         vsocket = find_vhost_user_socket(path);
 575         if (vsocket)
 576                 vsocket->vdpa_dev_id = did;
 577         pthread_mutex_unlock(&vhost_user.mutex);
 578
 579         return vsocket ? 0 : -1;
 580 }
 581
 582 int
 583 rte_vhost_driver_detach_vdpa_device(const char *path)
 584 {
 585         struct vhost_user_socket *vsocket;
 586
 587         pthread_mutex_lock(&vhost_user.mutex);
 588         vsocket = find_vhost_user_socket(path);
 589         if (vsocket)
 590                 vsocket->vdpa_dev_id = -1;
 591         pthread_mutex_unlock(&vhost_user.mutex);
 592
 593         return vsocket ? 0 : -1;
 594 }
 595
 596 int
 597 rte_vhost_driver_get_vdpa_device_id(const char *path)
 598 {
 599         struct vhost_user_socket *vsocket;
 600         int did = -1;
 601
 602         pthread_mutex_lock(&vhost_user.mutex);
 603         vsocket = find_vhost_user_socket(path);
 604         if (vsocket)
 605                 did = vsocket->vdpa_dev_id;
 606         pthread_mutex_unlock(&vhost_user.mutex);
 607
 608         return did;
 609 }
 610
 611 int
 612 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 613 {
 614         struct vhost_user_socket *vsocket;
 615
 616         pthread_mutex_lock(&vhost_user.mutex);
 617         vsocket = find_vhost_user_socket(path);
 618
 619         /* Note that use_builtin_virtio_net is not affected by this function
 620          * since callers may want to selectively disable features of the
 621          * built-in vhost net device backend.
 622          */
 623
 624         if (vsocket)
 625                 vsocket->features &= ~features;
 626         pthread_mutex_unlock(&vhost_user.mutex);
 627
 628         return vsocket ? 0 : -1;
 629 }
 630
 631 int
 632 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 633 {
 634         struct vhost_user_socket *vsocket;
 635
 636         pthread_mutex_lock(&vhost_user.mutex);
 637         vsocket = find_vhost_user_socket(path);
 638         if (vsocket) {
 639                 if ((vsocket->supported_features & features) != features) {
 640                         /*
 641                          * trying to enable features the driver doesn't
 642                          * support.
 643                          */
 644                         pthread_mutex_unlock(&vhost_user.mutex);
 645                         return -1;
 646                 }
 647                 vsocket->features |= features;
 648         }
 649         pthread_mutex_unlock(&vhost_user.mutex);
 650
 651         return vsocket ? 0 : -1;
 652 }
 653
 654 int
 655 rte_vhost_driver_set_features(const char *path, uint64_t features)
 656 {
 657         struct vhost_user_socket *vsocket;
 658
 659         pthread_mutex_lock(&vhost_user.mutex);
 660         vsocket = find_vhost_user_socket(path);
 661         if (vsocket) {
 662                 vsocket->supported_features = features;
 663                 vsocket->features = features;
 664
 665                 /* Anyone setting feature bits is implementing their own vhost
 666                  * device backend.
 667                  */
 668                 vsocket->use_builtin_virtio_net = false;
 669         }
 670         pthread_mutex_unlock(&vhost_user.mutex);
 671
 672         return vsocket ? 0 : -1;
 673 }
 674
 675 int
 676 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 677 {
 678         struct vhost_user_socket *vsocket;
 679         uint64_t vdpa_features;
 680         struct rte_vdpa_device *vdpa_dev;
 681         int did = -1;
 682         int ret = 0;
 683
 684         pthread_mutex_lock(&vhost_user.mutex);
 685         vsocket = find_vhost_user_socket(path);
 686         if (!vsocket) {
 687                 RTE_LOG(ERR, VHOST_CONFIG,
 688                         "socket file %s is not registered yet.\n", path);
 689                 ret = -1;
 690                 goto unlock_exit;
 691         }
 692
 693         did = vsocket->vdpa_dev_id;
 694         vdpa_dev = rte_vdpa_get_device(did);
 695         if (!vdpa_dev || !vdpa_dev->ops->get_features) {
 696                 *features = vsocket->features;
 697                 goto unlock_exit;
 698         }
 699
 700         if (vdpa_dev->ops->get_features(did, &vdpa_features) < 0) {
 701                 RTE_LOG(ERR, VHOST_CONFIG,
 702                                 "failed to get vdpa features "
 703                                 "for socket file %s.\n", path);
 704                 ret = -1;
 705                 goto unlock_exit;
 706         }
 707
 708         *features = vsocket->features & vdpa_features;
 709
 710 unlock_exit:
 711         pthread_mutex_unlock(&vhost_user.mutex);
 712         return ret;
 713 }
 714
 715 int
 716 rte_vhost_driver_set_protocol_features(const char *path,
 717                 uint64_t protocol_features)
 718 {
 719         struct vhost_user_socket *vsocket;
 720
 721         pthread_mutex_lock(&vhost_user.mutex);
 722         vsocket = find_vhost_user_socket(path);
 723         if (vsocket)
 724                 vsocket->protocol_features = protocol_features;
 725         pthread_mutex_unlock(&vhost_user.mutex);
 726         return vsocket ? 0 : -1;
 727 }
 728
 729 int
 730 rte_vhost_driver_get_protocol_features(const char *path,
 731                 uint64_t *protocol_features)
 732 {
 733         struct vhost_user_socket *vsocket;
 734         uint64_t vdpa_protocol_features;
 735         struct rte_vdpa_device *vdpa_dev;
 736         int did = -1;
 737         int ret = 0;
 738
 739         pthread_mutex_lock(&vhost_user.mutex);
 740         vsocket = find_vhost_user_socket(path);
 741         if (!vsocket) {
 742                 RTE_LOG(ERR, VHOST_CONFIG,
 743                         "socket file %s is not registered yet.\n", path);
 744                 ret = -1;
 745                 goto unlock_exit;
 746         }
 747
 748         did = vsocket->vdpa_dev_id;
 749         vdpa_dev = rte_vdpa_get_device(did);
 750         if (!vdpa_dev || !vdpa_dev->ops->get_protocol_features) {
 751                 *protocol_features = vsocket->protocol_features;
 752                 goto unlock_exit;
 753         }
 754
 755         if (vdpa_dev->ops->get_protocol_features(did,
 756                                 &vdpa_protocol_features) < 0) {
 757                 RTE_LOG(ERR, VHOST_CONFIG,
 758                                 "failed to get vdpa protocol features "
 759                                 "for socket file %s.\n", path);
 760                 ret = -1;
 761                 goto unlock_exit;
 762         }
 763
 764         *protocol_features = vsocket->protocol_features
 765                 & vdpa_protocol_features;
 766
 767 unlock_exit:
 768         pthread_mutex_unlock(&vhost_user.mutex);
 769         return ret;
 770 }
 771
 772 int
 773 rte_vhost_driver_get_queue_num(const char *path, uint32_t *queue_num)
 774 {
 775         struct vhost_user_socket *vsocket;
 776         uint32_t vdpa_queue_num;
 777         struct rte_vdpa_device *vdpa_dev;
 778         int did = -1;
 779         int ret = 0;
 780
 781         pthread_mutex_lock(&vhost_user.mutex);
 782         vsocket = find_vhost_user_socket(path);
 783         if (!vsocket) {
 784                 RTE_LOG(ERR, VHOST_CONFIG,
 785                         "socket file %s is not registered yet.\n", path);
 786                 ret = -1;
 787                 goto unlock_exit;
 788         }
 789
 790         did = vsocket->vdpa_dev_id;
 791         vdpa_dev = rte_vdpa_get_device(did);
 792         if (!vdpa_dev || !vdpa_dev->ops->get_queue_num) {
 793                 *queue_num = VHOST_MAX_QUEUE_PAIRS;
 794                 goto unlock_exit;
 795         }
 796
 797         if (vdpa_dev->ops->get_queue_num(did, &vdpa_queue_num) < 0) {
 798                 RTE_LOG(ERR, VHOST_CONFIG,
 799                                 "failed to get vdpa queue number "
 800                                 "for socket file %s.\n", path);
 801                 ret = -1;
 802                 goto unlock_exit;
 803         }
 804
 805         *queue_num = RTE_MIN((uint32_t)VHOST_MAX_QUEUE_PAIRS, vdpa_queue_num);
 806
 807 unlock_exit:
 808         pthread_mutex_unlock(&vhost_user.mutex);
 809         return ret;
 810 }
 811
 812 static void
 813 vhost_user_socket_mem_free(struct vhost_user_socket *vsocket)
 814 {
 815         if (vsocket && vsocket->path) {
 816                 free(vsocket->path);
 817                 vsocket->path = NULL;
 818         }
 819
 820         if (vsocket) {
 821                 free(vsocket);
 822                 vsocket = NULL;
 823         }
 824 }
 825
 826 /*
 827  * Register a new vhost-user socket; here we could act as server
 828  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 829  * is set.
 830  */
 831 int
 832 rte_vhost_driver_register(const char *path, uint64_t flags)
 833 {
 834         int ret = -1;
 835         struct vhost_user_socket *vsocket;
 836
 837         if (!path)
 838                 return -1;
 839
 840         pthread_mutex_lock(&vhost_user.mutex);
 841
 842         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 843                 RTE_LOG(ERR, VHOST_CONFIG,
 844                         "error: the number of vhost sockets reaches maximum\n");
 845                 goto out;
 846         }
 847
 848         vsocket = malloc(sizeof(struct vhost_user_socket));
 849         if (!vsocket)
 850                 goto out;
 851         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 852         vsocket->path = strdup(path);
 853         if (vsocket->path == NULL) {
 854                 RTE_LOG(ERR, VHOST_CONFIG,
 855                         "error: failed to copy socket path string\n");
 856                 vhost_user_socket_mem_free(vsocket);
 857                 goto out;
 858         }
 859         TAILQ_INIT(&vsocket->conn_list);
 860         ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
 861         if (ret) {
 862                 RTE_LOG(ERR, VHOST_CONFIG,
 863                         "error: failed to init connection mutex\n");
 864                 goto out_free;
 865         }
 866         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 867
 868         /*
 869          * Set the supported features correctly for the builtin vhost-user
 870          * net driver.
 871          *
 872          * Applications know nothing about features the builtin virtio net
 873          * driver (virtio_net.c) supports, thus it's not possible for them
 874          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 875          * we set it unconditionally. If the application want to implement
 876          * another vhost-user driver (say SCSI), it should call the
 877          * rte_vhost_driver_set_features(), which will overwrite following
 878          * two values.
 879          */
 880         vsocket->use_builtin_virtio_net = true;
 881         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 882         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 883         vsocket->protocol_features  = VHOST_USER_PROTOCOL_FEATURES;
 884
 885         /*
 886          * Dequeue zero copy can't assure descriptors returned in order.
 887          * Also, it requires that the guest memory is populated, which is
 888          * not compatible with postcopy.
 889          */
 890         if (vsocket->dequeue_zero_copy) {
 891                 vsocket->supported_features &= ~(1ULL << VIRTIO_F_IN_ORDER);
 892                 vsocket->features &= ~(1ULL << VIRTIO_F_IN_ORDER);
 893
 894                 RTE_LOG(INFO, VHOST_CONFIG,
 895                         "Dequeue zero copy requested, disabling postcopy support\n");
 896                 vsocket->protocol_features &=
 897                         ~(1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT);
 898         }
 899
 900         if (!(flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
 901                 vsocket->supported_features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 902                 vsocket->features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 903         }
 904
 905         if (!(flags & RTE_VHOST_USER_POSTCOPY_SUPPORT)) {
 906                 vsocket->protocol_features &=
 907                         ~(1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT);
 908         } else {
 909 #ifndef RTE_LIBRTE_VHOST_POSTCOPY
 910                 RTE_LOG(ERR, VHOST_CONFIG,
 911                         "Postcopy requested but not compiled\n");
 912                 ret = -1;
 913                 goto out_mutex;
 914 #endif
 915         }
 916
 917         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 918                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 919                 if (vsocket->reconnect && reconn_tid == 0) {
 920                         if (vhost_user_reconnect_init() != 0)
 921                                 goto out_mutex;
 922                 }
 923         } else {
 924                 vsocket->is_server = true;
 925         }
 926         ret = create_unix_socket(vsocket);
 927         if (ret < 0) {
 928                 goto out_mutex;
 929         }
 930
 931         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 932
 933         pthread_mutex_unlock(&vhost_user.mutex);
 934         return ret;
 935
 936 out_mutex:
 937         if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
 938                 RTE_LOG(ERR, VHOST_CONFIG,
 939                         "error: failed to destroy connection mutex\n");
 940         }
 941 out_free:
 942         vhost_user_socket_mem_free(vsocket);
 943 out:
 944         pthread_mutex_unlock(&vhost_user.mutex);
 945
 946         return ret;
 947 }
 948
 949 static bool
 950 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
 951 {
 952         int found = false;
 953         struct vhost_user_reconnect *reconn, *next;
 954
 955         pthread_mutex_lock(&reconn_list.mutex);
 956
 957         for (reconn = TAILQ_FIRST(&reconn_list.head);
 958              reconn != NULL; reconn = next) {
 959                 next = TAILQ_NEXT(reconn, next);
 960
 961                 if (reconn->vsocket == vsocket) {
 962                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 963                         close(reconn->fd);
 964                         free(reconn);
 965                         found = true;
 966                         break;
 967                 }
 968         }
 969         pthread_mutex_unlock(&reconn_list.mutex);
 970         return found;
 971 }
 972
 973 /**
 974  * Unregister the specified vhost socket
 975  */
 976 int
 977 rte_vhost_driver_unregister(const char *path)
 978 {
 979         int i;
 980         int count;
 981         struct vhost_user_connection *conn, *next;
 982
 983         if (path == NULL)
 984                 return -1;
 985
 986 again:
 987         pthread_mutex_lock(&vhost_user.mutex);
 988
 989         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 990                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 991
 992                 if (!strcmp(vsocket->path, path)) {
 993                         pthread_mutex_lock(&vsocket->conn_mutex);
 994                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
 995                              conn != NULL;
 996                              conn = next) {
 997                                 next = TAILQ_NEXT(conn, next);
 998
 999                                 /*
1000                                  * If r/wcb is executing, release the
1001                                  * conn_mutex lock, and try again since
1002                                  * the r/wcb may use the conn_mutex lock.
1003                                  */
1004                                 if (fdset_try_del(&vhost_user.fdset,
1005                                                   conn->connfd) == -1) {
1006                                         pthread_mutex_unlock(
1007                                                         &vsocket->conn_mutex);
1008                                         pthread_mutex_unlock(&vhost_user.mutex);
1009                                         goto again;
1010                                 }
1011
1012                                 RTE_LOG(INFO, VHOST_CONFIG,
1013                                         "free connfd = %d for device '%s'\n",
1014                                         conn->connfd, path);
1015                                 close(conn->connfd);
1016                                 vhost_destroy_device(conn->vid);
1017                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
1018                                 free(conn);
1019                         }
1020                         pthread_mutex_unlock(&vsocket->conn_mutex);
1021
1022                         if (vsocket->is_server) {
1023                                 fdset_del(&vhost_user.fdset,
1024                                                 vsocket->socket_fd);
1025                                 close(vsocket->socket_fd);
1026                                 unlink(path);
1027                         } else if (vsocket->reconnect) {
1028                                 vhost_user_remove_reconnect(vsocket);
1029                         }
1030
1031                         pthread_mutex_destroy(&vsocket->conn_mutex);
1032                         vhost_user_socket_mem_free(vsocket);
1033
1034                         count = --vhost_user.vsocket_cnt;
1035                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
1036                         vhost_user.vsockets[count] = NULL;
1037                         pthread_mutex_unlock(&vhost_user.mutex);
1038
1039                         return 0;
1040                 }
1041         }
1042         pthread_mutex_unlock(&vhost_user.mutex);
1043
1044         return -1;
1045 }
1046
1047 /*
1048  * Register ops so that we can add/remove device to data core.
1049  */
1050 int
1051 rte_vhost_driver_callback_register(const char *path,
1052         struct vhost_device_ops const * const ops)
1053 {
1054         struct vhost_user_socket *vsocket;
1055
1056         pthread_mutex_lock(&vhost_user.mutex);
1057         vsocket = find_vhost_user_socket(path);
1058         if (vsocket)
1059                 vsocket->notify_ops = ops;
1060         pthread_mutex_unlock(&vhost_user.mutex);
1061
1062         return vsocket ? 0 : -1;
1063 }
1064
1065 struct vhost_device_ops const *
1066 vhost_driver_callback_get(const char *path)
1067 {
1068         struct vhost_user_socket *vsocket;
1069
1070         pthread_mutex_lock(&vhost_user.mutex);
1071         vsocket = find_vhost_user_socket(path);
1072         pthread_mutex_unlock(&vhost_user.mutex);
1073
1074         return vsocket ? vsocket->notify_ops : NULL;
1075 }
1076
1077 int
1078 rte_vhost_driver_start(const char *path)
1079 {
1080         struct vhost_user_socket *vsocket;
1081         static pthread_t fdset_tid;
1082
1083         pthread_mutex_lock(&vhost_user.mutex);
1084         vsocket = find_vhost_user_socket(path);
1085         pthread_mutex_unlock(&vhost_user.mutex);
1086
1087         if (!vsocket)
1088                 return -1;
1089
1090         if (fdset_tid == 0) {
1091                 /**
1092                  * create a pipe which will be waited by poll and notified to
1093                  * rebuild the wait list of poll.
1094                  */
1095                 if (fdset_pipe_init(&vhost_user.fdset) < 0) {
1096                         RTE_LOG(ERR, VHOST_CONFIG,
1097                                 "failed to create pipe for vhost fdset\n");
1098                         return -1;
1099                 }
1100
1101                 int ret = rte_ctrl_thread_create(&fdset_tid,
1102                         "vhost-events", NULL, fdset_event_dispatch,
1103                         &vhost_user.fdset);
1104                 if (ret != 0) {
1105                         RTE_LOG(ERR, VHOST_CONFIG,
1106                                 "failed to create fdset handling thread");
1107
1108                         fdset_pipe_uninit(&vhost_user.fdset);
1109                         return -1;
1110                 }
1111         }
1112
1113         if (vsocket->is_server)
1114                 return vhost_user_start_server(vsocket);
1115         else
1116                 return vhost_user_start_client(vsocket);
1117 }