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         bool extbuf;
  44         bool linearbuf;
  45
  46         /*
  47          * The "supported_features" indicates the feature bits the
  48          * vhost driver supports. The "features" indicates the feature
  49          * bits after the rte_vhost_driver_features_disable/enable().
  50          * It is also the final feature bits used for vhost-user
  51          * features negotiation.
  52          */
  53         uint64_t supported_features;
  54         uint64_t features;
  55
  56         uint64_t protocol_features;
  57
  58         /*
  59          * Device id to identify a specific backend device.
  60          * It's set to -1 for the default software implementation.
  61          * If valid, one socket can have 1 connection only.
  62          */
  63         int vdpa_dev_id;
  64
  65         struct vhost_device_ops const *notify_ops;
  66 };
  67
  68 struct vhost_user_connection {
  69         struct vhost_user_socket *vsocket;
  70         int connfd;
  71         int vid;
  72
  73         TAILQ_ENTRY(vhost_user_connection) next;
  74 };
  75
  76 #define MAX_VHOST_SOCKET 1024
  77 struct vhost_user {
  78         struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
  79         struct fdset fdset;
  80         int vsocket_cnt;
  81         pthread_mutex_t mutex;
  82 };
  83
  84 #define MAX_VIRTIO_BACKLOG 128
  85
  86 static void vhost_user_server_new_connection(int fd, void *data, int *remove);
  87 static void vhost_user_read_cb(int fd, void *dat, int *remove);
  88 static int create_unix_socket(struct vhost_user_socket *vsocket);
  89 static int vhost_user_start_client(struct vhost_user_socket *vsocket);
  90
  91 static struct vhost_user vhost_user = {
  92         .fdset = {
  93                 .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
  94                 .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
  95                 .fd_pooling_mutex = PTHREAD_MUTEX_INITIALIZER,
  96                 .num = 0
  97         },
  98         .vsocket_cnt = 0,
  99         .mutex = PTHREAD_MUTEX_INITIALIZER,
 100 };
 101
 102 /*
 103  * return bytes# of read on success or negative val on failure. Update fdnum
 104  * with number of fds read.
 105  */
 106 int
 107 read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds,
 108                 int *fd_num)
 109 {
 110         struct iovec iov;
 111         struct msghdr msgh;
 112         char control[CMSG_SPACE(max_fds * sizeof(int))];
 113         struct cmsghdr *cmsg;
 114         int got_fds = 0;
 115         int ret;
 116
 117         *fd_num = 0;
 118
 119         memset(&msgh, 0, sizeof(msgh));
 120         iov.iov_base = buf;
 121         iov.iov_len  = buflen;
 122
 123         msgh.msg_iov = &iov;
 124         msgh.msg_iovlen = 1;
 125         msgh.msg_control = control;
 126         msgh.msg_controllen = sizeof(control);
 127
 128         ret = recvmsg(sockfd, &msgh, 0);
 129         if (ret <= 0) {
 130                 if (ret)
 131                         VHOST_LOG_CONFIG(ERR, "recvmsg failed\n");
 132                 return ret;
 133         }
 134
 135         if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
 136                 VHOST_LOG_CONFIG(ERR, "truncated msg\n");
 137                 return -1;
 138         }
 139
 140         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 141                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 142                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 143                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 144                         got_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
 145                         *fd_num = got_fds;
 146                         memcpy(fds, CMSG_DATA(cmsg), got_fds * sizeof(int));
 147                         break;
 148                 }
 149         }
 150
 151         /* Clear out unused file descriptors */
 152         while (got_fds < max_fds)
 153                 fds[got_fds++] = -1;
 154
 155         return ret;
 156 }
 157
 158 int
 159 send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 160 {
 161
 162         struct iovec iov;
 163         struct msghdr msgh;
 164         size_t fdsize = fd_num * sizeof(int);
 165         char control[CMSG_SPACE(fdsize)];
 166         struct cmsghdr *cmsg;
 167         int ret;
 168
 169         memset(&msgh, 0, sizeof(msgh));
 170         iov.iov_base = buf;
 171         iov.iov_len = buflen;
 172
 173         msgh.msg_iov = &iov;
 174         msgh.msg_iovlen = 1;
 175
 176         if (fds && fd_num > 0) {
 177                 msgh.msg_control = control;
 178                 msgh.msg_controllen = sizeof(control);
 179                 cmsg = CMSG_FIRSTHDR(&msgh);
 180                 if (cmsg == NULL) {
 181                         VHOST_LOG_CONFIG(ERR, "cmsg == NULL\n");
 182                         errno = EINVAL;
 183                         return -1;
 184                 }
 185                 cmsg->cmsg_len = CMSG_LEN(fdsize);
 186                 cmsg->cmsg_level = SOL_SOCKET;
 187                 cmsg->cmsg_type = SCM_RIGHTS;
 188                 memcpy(CMSG_DATA(cmsg), fds, fdsize);
 189         } else {
 190                 msgh.msg_control = NULL;
 191                 msgh.msg_controllen = 0;
 192         }
 193
 194         do {
 195                 ret = sendmsg(sockfd, &msgh, MSG_NOSIGNAL);
 196         } while (ret < 0 && errno == EINTR);
 197
 198         if (ret < 0) {
 199                 VHOST_LOG_CONFIG(ERR,  "sendmsg error\n");
 200                 return ret;
 201         }
 202
 203         return ret;
 204 }
 205
 206 static void
 207 vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 208 {
 209         int vid;
 210         size_t size;
 211         struct vhost_user_connection *conn;
 212         int ret;
 213
 214         if (vsocket == NULL)
 215                 return;
 216
 217         conn = malloc(sizeof(*conn));
 218         if (conn == NULL) {
 219                 close(fd);
 220                 return;
 221         }
 222
 223         vid = vhost_new_device();
 224         if (vid == -1) {
 225                 goto err;
 226         }
 227
 228         size = strnlen(vsocket->path, PATH_MAX);
 229         vhost_set_ifname(vid, vsocket->path, size);
 230
 231         vhost_set_builtin_virtio_net(vid, vsocket->use_builtin_virtio_net);
 232
 233         vhost_attach_vdpa_device(vid, vsocket->vdpa_dev_id);
 234
 235         if (vsocket->dequeue_zero_copy)
 236                 vhost_enable_dequeue_zero_copy(vid);
 237
 238         if (vsocket->extbuf)
 239                 vhost_enable_extbuf(vid);
 240
 241         if (vsocket->linearbuf)
 242                 vhost_enable_linearbuf(vid);
 243
 244         VHOST_LOG_CONFIG(INFO, "new device, handle is %d\n", vid);
 245
 246         if (vsocket->notify_ops->new_connection) {
 247                 ret = vsocket->notify_ops->new_connection(vid);
 248                 if (ret < 0) {
 249                         VHOST_LOG_CONFIG(ERR,
 250                                 "failed to add vhost user connection with fd %d\n",
 251                                 fd);
 252                         goto err_cleanup;
 253                 }
 254         }
 255
 256         conn->connfd = fd;
 257         conn->vsocket = vsocket;
 258         conn->vid = vid;
 259         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
 260                         NULL, conn);
 261         if (ret < 0) {
 262                 VHOST_LOG_CONFIG(ERR,
 263                         "failed to add fd %d into vhost server fdset\n",
 264                         fd);
 265
 266                 if (vsocket->notify_ops->destroy_connection)
 267                         vsocket->notify_ops->destroy_connection(conn->vid);
 268
 269                 goto err_cleanup;
 270         }
 271
 272         pthread_mutex_lock(&vsocket->conn_mutex);
 273         TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
 274         pthread_mutex_unlock(&vsocket->conn_mutex);
 275
 276         fdset_pipe_notify(&vhost_user.fdset);
 277         return;
 278
 279 err_cleanup:
 280         vhost_destroy_device(vid);
 281 err:
 282         free(conn);
 283         close(fd);
 284 }
 285
 286 /* call back when there is new vhost-user connection from client  */
 287 static void
 288 vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
 289 {
 290         struct vhost_user_socket *vsocket = dat;
 291
 292         fd = accept(fd, NULL, NULL);
 293         if (fd < 0)
 294                 return;
 295
 296         VHOST_LOG_CONFIG(INFO, "new vhost user connection is %d\n", fd);
 297         vhost_user_add_connection(fd, vsocket);
 298 }
 299
 300 static void
 301 vhost_user_read_cb(int connfd, void *dat, int *remove)
 302 {
 303         struct vhost_user_connection *conn = dat;
 304         struct vhost_user_socket *vsocket = conn->vsocket;
 305         int ret;
 306
 307         ret = vhost_user_msg_handler(conn->vid, connfd);
 308         if (ret < 0) {
 309                 struct virtio_net *dev = get_device(conn->vid);
 310
 311                 close(connfd);
 312                 *remove = 1;
 313
 314                 if (dev)
 315                         vhost_destroy_device_notify(dev);
 316
 317                 if (vsocket->notify_ops->destroy_connection)
 318                         vsocket->notify_ops->destroy_connection(conn->vid);
 319
 320                 vhost_destroy_device(conn->vid);
 321
 322                 if (vsocket->reconnect) {
 323                         create_unix_socket(vsocket);
 324                         vhost_user_start_client(vsocket);
 325                 }
 326
 327                 pthread_mutex_lock(&vsocket->conn_mutex);
 328                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
 329                 pthread_mutex_unlock(&vsocket->conn_mutex);
 330
 331                 free(conn);
 332         }
 333 }
 334
 335 static int
 336 create_unix_socket(struct vhost_user_socket *vsocket)
 337 {
 338         int fd;
 339         struct sockaddr_un *un = &vsocket->un;
 340
 341         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 342         if (fd < 0)
 343                 return -1;
 344         VHOST_LOG_CONFIG(INFO, "vhost-user %s: socket created, fd: %d\n",
 345                 vsocket->is_server ? "server" : "client", fd);
 346
 347         if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
 348                 VHOST_LOG_CONFIG(ERR,
 349                         "vhost-user: can't set nonblocking mode for socket, fd: "
 350                         "%d (%s)\n", fd, strerror(errno));
 351                 close(fd);
 352                 return -1;
 353         }
 354
 355         memset(un, 0, sizeof(*un));
 356         un->sun_family = AF_UNIX;
 357         strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
 358         un->sun_path[sizeof(un->sun_path) - 1] = '\0';
 359
 360         vsocket->socket_fd = fd;
 361         return 0;
 362 }
 363
 364 static int
 365 vhost_user_start_server(struct vhost_user_socket *vsocket)
 366 {
 367         int ret;
 368         int fd = vsocket->socket_fd;
 369         const char *path = vsocket->path;
 370
 371         /*
 372          * bind () may fail if the socket file with the same name already
 373          * exists. But the library obviously should not delete the file
 374          * provided by the user, since we can not be sure that it is not
 375          * being used by other applications. Moreover, many applications form
 376          * socket names based on user input, which is prone to errors.
 377          *
 378          * The user must ensure that the socket does not exist before
 379          * registering the vhost driver in server mode.
 380          */
 381         ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 382         if (ret < 0) {
 383                 VHOST_LOG_CONFIG(ERR,
 384                         "failed to bind to %s: %s; remove it and try again\n",
 385                         path, strerror(errno));
 386                 goto err;
 387         }
 388         VHOST_LOG_CONFIG(INFO, "bind to %s\n", path);
 389
 390         ret = listen(fd, MAX_VIRTIO_BACKLOG);
 391         if (ret < 0)
 392                 goto err;
 393
 394         ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
 395                   NULL, vsocket);
 396         if (ret < 0) {
 397                 VHOST_LOG_CONFIG(ERR,
 398                         "failed to add listen fd %d to vhost server fdset\n",
 399                         fd);
 400                 goto err;
 401         }
 402
 403         return 0;
 404
 405 err:
 406         close(fd);
 407         return -1;
 408 }
 409
 410 struct vhost_user_reconnect {
 411         struct sockaddr_un un;
 412         int fd;
 413         struct vhost_user_socket *vsocket;
 414
 415         TAILQ_ENTRY(vhost_user_reconnect) next;
 416 };
 417
 418 TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
 419 struct vhost_user_reconnect_list {
 420         struct vhost_user_reconnect_tailq_list head;
 421         pthread_mutex_t mutex;
 422 };
 423
 424 static struct vhost_user_reconnect_list reconn_list;
 425 static pthread_t reconn_tid;
 426
 427 static int
 428 vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 429 {
 430         int ret, flags;
 431
 432         ret = connect(fd, un, sz);
 433         if (ret < 0 && errno != EISCONN)
 434                 return -1;
 435
 436         flags = fcntl(fd, F_GETFL, 0);
 437         if (flags < 0) {
 438                 VHOST_LOG_CONFIG(ERR,
 439                         "can't get flags for connfd %d\n", fd);
 440                 return -2;
 441         }
 442         if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
 443                 VHOST_LOG_CONFIG(ERR,
 444                                 "can't disable nonblocking on fd %d\n", fd);
 445                 return -2;
 446         }
 447         return 0;
 448 }
 449
 450 static void *
 451 vhost_user_client_reconnect(void *arg __rte_unused)
 452 {
 453         int ret;
 454         struct vhost_user_reconnect *reconn, *next;
 455
 456         while (1) {
 457                 pthread_mutex_lock(&reconn_list.mutex);
 458
 459                 /*
 460                  * An equal implementation of TAILQ_FOREACH_SAFE,
 461                  * which does not exist on all platforms.
 462                  */
 463                 for (reconn = TAILQ_FIRST(&reconn_list.head);
 464                      reconn != NULL; reconn = next) {
 465                         next = TAILQ_NEXT(reconn, next);
 466
 467                         ret = vhost_user_connect_nonblock(reconn->fd,
 468                                                 (struct sockaddr *)&reconn->un,
 469                                                 sizeof(reconn->un));
 470                         if (ret == -2) {
 471                                 close(reconn->fd);
 472                                 VHOST_LOG_CONFIG(ERR,
 473                                         "reconnection for fd %d failed\n",
 474                                         reconn->fd);
 475                                 goto remove_fd;
 476                         }
 477                         if (ret == -1)
 478                                 continue;
 479
 480                         VHOST_LOG_CONFIG(INFO,
 481                                 "%s: connected\n", reconn->vsocket->path);
 482                         vhost_user_add_connection(reconn->fd, reconn->vsocket);
 483 remove_fd:
 484                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
 485                         free(reconn);
 486                 }
 487
 488                 pthread_mutex_unlock(&reconn_list.mutex);
 489                 sleep(1);
 490         }
 491
 492         return NULL;
 493 }
 494
 495 static int
 496 vhost_user_reconnect_init(void)
 497 {
 498         int ret;
 499
 500         ret = pthread_mutex_init(&reconn_list.mutex, NULL);
 501         if (ret < 0) {
 502                 VHOST_LOG_CONFIG(ERR, "failed to initialize mutex");
 503                 return ret;
 504         }
 505         TAILQ_INIT(&reconn_list.head);
 506
 507         ret = rte_ctrl_thread_create(&reconn_tid, "vhost_reconn", NULL,
 508                              vhost_user_client_reconnect, NULL);
 509         if (ret != 0) {
 510                 VHOST_LOG_CONFIG(ERR, "failed to create reconnect thread");
 511                 if (pthread_mutex_destroy(&reconn_list.mutex)) {
 512                         VHOST_LOG_CONFIG(ERR,
 513                                 "failed to destroy reconnect mutex");
 514                 }
 515         }
 516
 517         return ret;
 518 }
 519
 520 static int
 521 vhost_user_start_client(struct vhost_user_socket *vsocket)
 522 {
 523         int ret;
 524         int fd = vsocket->socket_fd;
 525         const char *path = vsocket->path;
 526         struct vhost_user_reconnect *reconn;
 527
 528         ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
 529                                           sizeof(vsocket->un));
 530         if (ret == 0) {
 531                 vhost_user_add_connection(fd, vsocket);
 532                 return 0;
 533         }
 534
 535         VHOST_LOG_CONFIG(WARNING,
 536                 "failed to connect to %s: %s\n",
 537                 path, strerror(errno));
 538
 539         if (ret == -2 || !vsocket->reconnect) {
 540                 close(fd);
 541                 return -1;
 542         }
 543
 544         VHOST_LOG_CONFIG(INFO, "%s: reconnecting...\n", path);
 545         reconn = malloc(sizeof(*reconn));
 546         if (reconn == NULL) {
 547                 VHOST_LOG_CONFIG(ERR,
 548                         "failed to allocate memory for reconnect\n");
 549                 close(fd);
 550                 return -1;
 551         }
 552         reconn->un = vsocket->un;
 553         reconn->fd = fd;
 554         reconn->vsocket = vsocket;
 555         pthread_mutex_lock(&reconn_list.mutex);
 556         TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
 557         pthread_mutex_unlock(&reconn_list.mutex);
 558
 559         return 0;
 560 }
 561
 562 static struct vhost_user_socket *
 563 find_vhost_user_socket(const char *path)
 564 {
 565         int i;
 566
 567         if (path == NULL)
 568                 return NULL;
 569
 570         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
 571                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 572
 573                 if (!strcmp(vsocket->path, path))
 574                         return vsocket;
 575         }
 576
 577         return NULL;
 578 }
 579
 580 int
 581 rte_vhost_driver_attach_vdpa_device(const char *path, int did)
 582 {
 583         struct vhost_user_socket *vsocket;
 584
 585         if (rte_vdpa_get_device(did) == NULL || path == NULL)
 586                 return -1;
 587
 588         pthread_mutex_lock(&vhost_user.mutex);
 589         vsocket = find_vhost_user_socket(path);
 590         if (vsocket)
 591                 vsocket->vdpa_dev_id = did;
 592         pthread_mutex_unlock(&vhost_user.mutex);
 593
 594         return vsocket ? 0 : -1;
 595 }
 596
 597 int
 598 rte_vhost_driver_detach_vdpa_device(const char *path)
 599 {
 600         struct vhost_user_socket *vsocket;
 601
 602         pthread_mutex_lock(&vhost_user.mutex);
 603         vsocket = find_vhost_user_socket(path);
 604         if (vsocket)
 605                 vsocket->vdpa_dev_id = -1;
 606         pthread_mutex_unlock(&vhost_user.mutex);
 607
 608         return vsocket ? 0 : -1;
 609 }
 610
 611 int
 612 rte_vhost_driver_get_vdpa_device_id(const char *path)
 613 {
 614         struct vhost_user_socket *vsocket;
 615         int did = -1;
 616
 617         pthread_mutex_lock(&vhost_user.mutex);
 618         vsocket = find_vhost_user_socket(path);
 619         if (vsocket)
 620                 did = vsocket->vdpa_dev_id;
 621         pthread_mutex_unlock(&vhost_user.mutex);
 622
 623         return did;
 624 }
 625
 626 int
 627 rte_vhost_driver_disable_features(const char *path, uint64_t features)
 628 {
 629         struct vhost_user_socket *vsocket;
 630
 631         pthread_mutex_lock(&vhost_user.mutex);
 632         vsocket = find_vhost_user_socket(path);
 633
 634         /* Note that use_builtin_virtio_net is not affected by this function
 635          * since callers may want to selectively disable features of the
 636          * built-in vhost net device backend.
 637          */
 638
 639         if (vsocket)
 640                 vsocket->features &= ~features;
 641         pthread_mutex_unlock(&vhost_user.mutex);
 642
 643         return vsocket ? 0 : -1;
 644 }
 645
 646 int
 647 rte_vhost_driver_enable_features(const char *path, uint64_t features)
 648 {
 649         struct vhost_user_socket *vsocket;
 650
 651         pthread_mutex_lock(&vhost_user.mutex);
 652         vsocket = find_vhost_user_socket(path);
 653         if (vsocket) {
 654                 if ((vsocket->supported_features & features) != features) {
 655                         /*
 656                          * trying to enable features the driver doesn't
 657                          * support.
 658                          */
 659                         pthread_mutex_unlock(&vhost_user.mutex);
 660                         return -1;
 661                 }
 662                 vsocket->features |= features;
 663         }
 664         pthread_mutex_unlock(&vhost_user.mutex);
 665
 666         return vsocket ? 0 : -1;
 667 }
 668
 669 int
 670 rte_vhost_driver_set_features(const char *path, uint64_t features)
 671 {
 672         struct vhost_user_socket *vsocket;
 673
 674         pthread_mutex_lock(&vhost_user.mutex);
 675         vsocket = find_vhost_user_socket(path);
 676         if (vsocket) {
 677                 vsocket->supported_features = features;
 678                 vsocket->features = features;
 679
 680                 /* Anyone setting feature bits is implementing their own vhost
 681                  * device backend.
 682                  */
 683                 vsocket->use_builtin_virtio_net = false;
 684         }
 685         pthread_mutex_unlock(&vhost_user.mutex);
 686
 687         return vsocket ? 0 : -1;
 688 }
 689
 690 int
 691 rte_vhost_driver_get_features(const char *path, uint64_t *features)
 692 {
 693         struct vhost_user_socket *vsocket;
 694         uint64_t vdpa_features;
 695         struct rte_vdpa_device *vdpa_dev;
 696         int did = -1;
 697         int ret = 0;
 698
 699         pthread_mutex_lock(&vhost_user.mutex);
 700         vsocket = find_vhost_user_socket(path);
 701         if (!vsocket) {
 702                 VHOST_LOG_CONFIG(ERR,
 703                         "socket file %s is not registered yet.\n", path);
 704                 ret = -1;
 705                 goto unlock_exit;
 706         }
 707
 708         did = vsocket->vdpa_dev_id;
 709         vdpa_dev = rte_vdpa_get_device(did);
 710         if (!vdpa_dev || !vdpa_dev->ops->get_features) {
 711                 *features = vsocket->features;
 712                 goto unlock_exit;
 713         }
 714
 715         if (vdpa_dev->ops->get_features(did, &vdpa_features) < 0) {
 716                 VHOST_LOG_CONFIG(ERR,
 717                                 "failed to get vdpa features "
 718                                 "for socket file %s.\n", path);
 719                 ret = -1;
 720                 goto unlock_exit;
 721         }
 722
 723         *features = vsocket->features & vdpa_features;
 724
 725 unlock_exit:
 726         pthread_mutex_unlock(&vhost_user.mutex);
 727         return ret;
 728 }
 729
 730 int
 731 rte_vhost_driver_set_protocol_features(const char *path,
 732                 uint64_t protocol_features)
 733 {
 734         struct vhost_user_socket *vsocket;
 735
 736         pthread_mutex_lock(&vhost_user.mutex);
 737         vsocket = find_vhost_user_socket(path);
 738         if (vsocket)
 739                 vsocket->protocol_features = protocol_features;
 740         pthread_mutex_unlock(&vhost_user.mutex);
 741         return vsocket ? 0 : -1;
 742 }
 743
 744 int
 745 rte_vhost_driver_get_protocol_features(const char *path,
 746                 uint64_t *protocol_features)
 747 {
 748         struct vhost_user_socket *vsocket;
 749         uint64_t vdpa_protocol_features;
 750         struct rte_vdpa_device *vdpa_dev;
 751         int did = -1;
 752         int ret = 0;
 753
 754         pthread_mutex_lock(&vhost_user.mutex);
 755         vsocket = find_vhost_user_socket(path);
 756         if (!vsocket) {
 757                 VHOST_LOG_CONFIG(ERR,
 758                         "socket file %s is not registered yet.\n", path);
 759                 ret = -1;
 760                 goto unlock_exit;
 761         }
 762
 763         did = vsocket->vdpa_dev_id;
 764         vdpa_dev = rte_vdpa_get_device(did);
 765         if (!vdpa_dev || !vdpa_dev->ops->get_protocol_features) {
 766                 *protocol_features = vsocket->protocol_features;
 767                 goto unlock_exit;
 768         }
 769
 770         if (vdpa_dev->ops->get_protocol_features(did,
 771                                 &vdpa_protocol_features) < 0) {
 772                 VHOST_LOG_CONFIG(ERR,
 773                                 "failed to get vdpa protocol features "
 774                                 "for socket file %s.\n", path);
 775                 ret = -1;
 776                 goto unlock_exit;
 777         }
 778
 779         *protocol_features = vsocket->protocol_features
 780                 & vdpa_protocol_features;
 781
 782 unlock_exit:
 783         pthread_mutex_unlock(&vhost_user.mutex);
 784         return ret;
 785 }
 786
 787 int
 788 rte_vhost_driver_get_queue_num(const char *path, uint32_t *queue_num)
 789 {
 790         struct vhost_user_socket *vsocket;
 791         uint32_t vdpa_queue_num;
 792         struct rte_vdpa_device *vdpa_dev;
 793         int did = -1;
 794         int ret = 0;
 795
 796         pthread_mutex_lock(&vhost_user.mutex);
 797         vsocket = find_vhost_user_socket(path);
 798         if (!vsocket) {
 799                 VHOST_LOG_CONFIG(ERR,
 800                         "socket file %s is not registered yet.\n", path);
 801                 ret = -1;
 802                 goto unlock_exit;
 803         }
 804
 805         did = vsocket->vdpa_dev_id;
 806         vdpa_dev = rte_vdpa_get_device(did);
 807         if (!vdpa_dev || !vdpa_dev->ops->get_queue_num) {
 808                 *queue_num = VHOST_MAX_QUEUE_PAIRS;
 809                 goto unlock_exit;
 810         }
 811
 812         if (vdpa_dev->ops->get_queue_num(did, &vdpa_queue_num) < 0) {
 813                 VHOST_LOG_CONFIG(ERR,
 814                                 "failed to get vdpa queue number "
 815                                 "for socket file %s.\n", path);
 816                 ret = -1;
 817                 goto unlock_exit;
 818         }
 819
 820         *queue_num = RTE_MIN((uint32_t)VHOST_MAX_QUEUE_PAIRS, vdpa_queue_num);
 821
 822 unlock_exit:
 823         pthread_mutex_unlock(&vhost_user.mutex);
 824         return ret;
 825 }
 826
 827 static void
 828 vhost_user_socket_mem_free(struct vhost_user_socket *vsocket)
 829 {
 830         if (vsocket && vsocket->path) {
 831                 free(vsocket->path);
 832                 vsocket->path = NULL;
 833         }
 834
 835         if (vsocket) {
 836                 free(vsocket);
 837                 vsocket = NULL;
 838         }
 839 }
 840
 841 /*
 842  * Register a new vhost-user socket; here we could act as server
 843  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
 844  * is set.
 845  */
 846 int
 847 rte_vhost_driver_register(const char *path, uint64_t flags)
 848 {
 849         int ret = -1;
 850         struct vhost_user_socket *vsocket;
 851
 852         if (!path)
 853                 return -1;
 854
 855         pthread_mutex_lock(&vhost_user.mutex);
 856
 857         if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
 858                 VHOST_LOG_CONFIG(ERR,
 859                         "error: the number of vhost sockets reaches maximum\n");
 860                 goto out;
 861         }
 862
 863         vsocket = malloc(sizeof(struct vhost_user_socket));
 864         if (!vsocket)
 865                 goto out;
 866         memset(vsocket, 0, sizeof(struct vhost_user_socket));
 867         vsocket->path = strdup(path);
 868         if (vsocket->path == NULL) {
 869                 VHOST_LOG_CONFIG(ERR,
 870                         "error: failed to copy socket path string\n");
 871                 vhost_user_socket_mem_free(vsocket);
 872                 goto out;
 873         }
 874         TAILQ_INIT(&vsocket->conn_list);
 875         ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
 876         if (ret) {
 877                 VHOST_LOG_CONFIG(ERR,
 878                         "error: failed to init connection mutex\n");
 879                 goto out_free;
 880         }
 881         vsocket->vdpa_dev_id = -1;
 882         vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 883         vsocket->extbuf = flags & RTE_VHOST_USER_EXTBUF_SUPPORT;
 884         vsocket->linearbuf = flags & RTE_VHOST_USER_LINEARBUF_SUPPORT;
 885
 886         if (vsocket->dequeue_zero_copy &&
 887             (flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
 888                 VHOST_LOG_CONFIG(ERR,
 889                         "error: enabling dequeue zero copy and IOMMU features "
 890                         "simultaneously is not supported\n");
 891                 goto out_mutex;
 892         }
 893
 894         /*
 895          * Set the supported features correctly for the builtin vhost-user
 896          * net driver.
 897          *
 898          * Applications know nothing about features the builtin virtio net
 899          * driver (virtio_net.c) supports, thus it's not possible for them
 900          * to invoke rte_vhost_driver_set_features(). To workaround it, here
 901          * we set it unconditionally. If the application want to implement
 902          * another vhost-user driver (say SCSI), it should call the
 903          * rte_vhost_driver_set_features(), which will overwrite following
 904          * two values.
 905          */
 906         vsocket->use_builtin_virtio_net = true;
 907         vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
 908         vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
 909         vsocket->protocol_features  = VHOST_USER_PROTOCOL_FEATURES;
 910
 911         /*
 912          * Dequeue zero copy can't assure descriptors returned in order.
 913          * Also, it requires that the guest memory is populated, which is
 914          * not compatible with postcopy.
 915          */
 916         if (vsocket->dequeue_zero_copy) {
 917                 if (vsocket->extbuf) {
 918                         VHOST_LOG_CONFIG(ERR,
 919                         "error: zero copy is incompatible with external buffers\n");
 920                         ret = -1;
 921                         goto out_mutex;
 922                 }
 923                 if (vsocket->linearbuf) {
 924                         VHOST_LOG_CONFIG(ERR,
 925                         "error: zero copy is incompatible with linear buffers\n");
 926                         ret = -1;
 927                         goto out_mutex;
 928                 }
 929                 if (!vsocket->is_server) {
 930                         VHOST_LOG_CONFIG(ERR,
 931                         "error: zero copy is incompatible with vhost client mode\n");
 932                         ret = -1;
 933                         goto out_mutex;
 934                 }
 935                 vsocket->supported_features &= ~(1ULL << VIRTIO_F_IN_ORDER);
 936                 vsocket->features &= ~(1ULL << VIRTIO_F_IN_ORDER);
 937
 938                 VHOST_LOG_CONFIG(INFO,
 939                         "Dequeue zero copy requested, disabling postcopy support\n");
 940                 vsocket->protocol_features &=
 941                         ~(1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT);
 942         }
 943
 944         /*
 945          * We'll not be able to receive a buffer from guest in linear mode
 946          * without external buffer if it will not fit in a single mbuf, which is
 947          * likely if segmentation offloading enabled.
 948          */
 949         if (vsocket->linearbuf && !vsocket->extbuf) {
 950                 uint64_t seg_offload_features =
 951                                 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
 952                                 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
 953                                 (1ULL << VIRTIO_NET_F_HOST_UFO);
 954
 955                 VHOST_LOG_CONFIG(INFO,
 956                         "Linear buffers requested without external buffers, "
 957                         "disabling host segmentation offloading support\n");
 958                 vsocket->supported_features &= ~seg_offload_features;
 959                 vsocket->features &= ~seg_offload_features;
 960         }
 961
 962         if (!(flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
 963                 vsocket->supported_features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 964                 vsocket->features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 965         }
 966
 967         if (!(flags & RTE_VHOST_USER_POSTCOPY_SUPPORT)) {
 968                 vsocket->protocol_features &=
 969                         ~(1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT);
 970         } else {
 971 #ifndef RTE_LIBRTE_VHOST_POSTCOPY
 972                 VHOST_LOG_CONFIG(ERR,
 973                         "Postcopy requested but not compiled\n");
 974                 ret = -1;
 975                 goto out_mutex;
 976 #endif
 977         }
 978
 979         if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
 980                 vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
 981                 if (vsocket->reconnect && reconn_tid == 0) {
 982                         if (vhost_user_reconnect_init() != 0)
 983                                 goto out_mutex;
 984                 }
 985         } else {
 986                 vsocket->is_server = true;
 987         }
 988         ret = create_unix_socket(vsocket);
 989         if (ret < 0) {
 990                 goto out_mutex;
 991         }
 992
 993         vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
 994
 995         pthread_mutex_unlock(&vhost_user.mutex);
 996         return ret;
 997
 998 out_mutex:
 999         if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
1000                 VHOST_LOG_CONFIG(ERR,
1001                         "error: failed to destroy connection mutex\n");
1002         }
1003 out_free:
1004         vhost_user_socket_mem_free(vsocket);
1005 out:
1006         pthread_mutex_unlock(&vhost_user.mutex);
1007
1008         return ret;
1009 }
1010
1011 static bool
1012 vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
1013 {
1014         int found = false;
1015         struct vhost_user_reconnect *reconn, *next;
1016
1017         pthread_mutex_lock(&reconn_list.mutex);
1018
1019         for (reconn = TAILQ_FIRST(&reconn_list.head);
1020              reconn != NULL; reconn = next) {
1021                 next = TAILQ_NEXT(reconn, next);
1022
1023                 if (reconn->vsocket == vsocket) {
1024                         TAILQ_REMOVE(&reconn_list.head, reconn, next);
1025                         close(reconn->fd);
1026                         free(reconn);
1027                         found = true;
1028                         break;
1029                 }
1030         }
1031         pthread_mutex_unlock(&reconn_list.mutex);
1032         return found;
1033 }
1034
1035 /**
1036  * Unregister the specified vhost socket
1037  */
1038 int
1039 rte_vhost_driver_unregister(const char *path)
1040 {
1041         int i;
1042         int count;
1043         struct vhost_user_connection *conn, *next;
1044
1045         if (path == NULL)
1046                 return -1;
1047
1048 again:
1049         pthread_mutex_lock(&vhost_user.mutex);
1050
1051         for (i = 0; i < vhost_user.vsocket_cnt; i++) {
1052                 struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
1053
1054                 if (!strcmp(vsocket->path, path)) {
1055                         pthread_mutex_lock(&vsocket->conn_mutex);
1056                         for (conn = TAILQ_FIRST(&vsocket->conn_list);
1057                              conn != NULL;
1058                              conn = next) {
1059                                 next = TAILQ_NEXT(conn, next);
1060
1061                                 /*
1062                                  * If r/wcb is executing, release vsocket's
1063                                  * conn_mutex and vhost_user's mutex locks, and
1064                                  * try again since the r/wcb may use the
1065                                  * conn_mutex and mutex locks.
1066                                  */
1067                                 if (fdset_try_del(&vhost_user.fdset,
1068                                                   conn->connfd) == -1) {
1069                                         pthread_mutex_unlock(
1070                                                         &vsocket->conn_mutex);
1071                                         pthread_mutex_unlock(&vhost_user.mutex);
1072                                         goto again;
1073                                 }
1074
1075                                 VHOST_LOG_CONFIG(INFO,
1076                                         "free connfd = %d for device '%s'\n",
1077                                         conn->connfd, path);
1078                                 close(conn->connfd);
1079                                 vhost_destroy_device(conn->vid);
1080                                 TAILQ_REMOVE(&vsocket->conn_list, conn, next);
1081                                 free(conn);
1082                         }
1083                         pthread_mutex_unlock(&vsocket->conn_mutex);
1084
1085                         if (vsocket->is_server) {
1086                                 /*
1087                                  * If r/wcb is executing, release vhost_user's
1088                                  * mutex lock, and try again since the r/wcb
1089                                  * may use the mutex lock.
1090                                  */
1091                                 if (fdset_try_del(&vhost_user.fdset,
1092                                                 vsocket->socket_fd) == -1) {
1093                                         pthread_mutex_unlock(&vhost_user.mutex);
1094                                         goto again;
1095                                 }
1096
1097                                 close(vsocket->socket_fd);
1098                                 unlink(path);
1099                         } else if (vsocket->reconnect) {
1100                                 vhost_user_remove_reconnect(vsocket);
1101                         }
1102
1103                         pthread_mutex_destroy(&vsocket->conn_mutex);
1104                         vhost_user_socket_mem_free(vsocket);
1105
1106                         count = --vhost_user.vsocket_cnt;
1107                         vhost_user.vsockets[i] = vhost_user.vsockets[count];
1108                         vhost_user.vsockets[count] = NULL;
1109                         pthread_mutex_unlock(&vhost_user.mutex);
1110
1111                         return 0;
1112                 }
1113         }
1114         pthread_mutex_unlock(&vhost_user.mutex);
1115
1116         return -1;
1117 }
1118
1119 /*
1120  * Register ops so that we can add/remove device to data core.
1121  */
1122 int
1123 rte_vhost_driver_callback_register(const char *path,
1124         struct vhost_device_ops const * const ops)
1125 {
1126         struct vhost_user_socket *vsocket;
1127
1128         pthread_mutex_lock(&vhost_user.mutex);
1129         vsocket = find_vhost_user_socket(path);
1130         if (vsocket)
1131                 vsocket->notify_ops = ops;
1132         pthread_mutex_unlock(&vhost_user.mutex);
1133
1134         return vsocket ? 0 : -1;
1135 }
1136
1137 struct vhost_device_ops const *
1138 vhost_driver_callback_get(const char *path)
1139 {
1140         struct vhost_user_socket *vsocket;
1141
1142         pthread_mutex_lock(&vhost_user.mutex);
1143         vsocket = find_vhost_user_socket(path);
1144         pthread_mutex_unlock(&vhost_user.mutex);
1145
1146         return vsocket ? vsocket->notify_ops : NULL;
1147 }
1148
1149 int
1150 rte_vhost_driver_start(const char *path)
1151 {
1152         struct vhost_user_socket *vsocket;
1153         static pthread_t fdset_tid;
1154
1155         pthread_mutex_lock(&vhost_user.mutex);
1156         vsocket = find_vhost_user_socket(path);
1157         pthread_mutex_unlock(&vhost_user.mutex);
1158
1159         if (!vsocket)
1160                 return -1;
1161
1162         if (fdset_tid == 0) {
1163                 /**
1164                  * create a pipe which will be waited by poll and notified to
1165                  * rebuild the wait list of poll.
1166                  */
1167                 if (fdset_pipe_init(&vhost_user.fdset) < 0) {
1168                         VHOST_LOG_CONFIG(ERR,
1169                                 "failed to create pipe for vhost fdset\n");
1170                         return -1;
1171                 }
1172
1173                 int ret = rte_ctrl_thread_create(&fdset_tid,
1174                         "vhost-events", NULL, fdset_event_dispatch,
1175                         &vhost_user.fdset);
1176                 if (ret != 0) {
1177                         VHOST_LOG_CONFIG(ERR,
1178                                 "failed to create fdset handling thread");
1179
1180                         fdset_pipe_uninit(&vhost_user.fdset);
1181                         return -1;
1182                 }
1183         }
1184
1185         if (vsocket->is_server)
1186                 return vhost_user_start_server(vsocket);
1187         else
1188                 return vhost_user_start_client(vsocket);
1189 }