1 /* 2 * vhost transport for vsock 3 * 4 * Copyright (C) 2013-2015 Red Hat, Inc. 5 * Author: Asias He <asias@redhat.com> 6 * Stefan Hajnoczi <stefanha@redhat.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2. 9 */ 10 #include <linux/miscdevice.h> 11 #include <linux/atomic.h> 12 #include <linux/module.h> 13 #include <linux/mutex.h> 14 #include <linux/vmalloc.h> 15 #include <net/sock.h> 16 #include <linux/virtio_vsock.h> 17 #include <linux/vhost.h> 18 19 #include <net/af_vsock.h> 20 #include "vhost.h" 21 22 #define VHOST_VSOCK_DEFAULT_HOST_CID 2 23 24 enum { 25 VHOST_VSOCK_FEATURES = VHOST_FEATURES, 26 }; 27 28 /* Used to track all the vhost_vsock instances on the system. */ 29 static DEFINE_SPINLOCK(vhost_vsock_lock); 30 static LIST_HEAD(vhost_vsock_list); 31 32 struct vhost_vsock { 33 struct vhost_dev dev; 34 struct vhost_virtqueue vqs[2]; 35 36 /* Link to global vhost_vsock_list, protected by vhost_vsock_lock */ 37 struct list_head list; 38 39 struct vhost_work send_pkt_work; 40 spinlock_t send_pkt_list_lock; 41 struct list_head send_pkt_list; /* host->guest pending packets */ 42 43 atomic_t queued_replies; 44 45 u32 guest_cid; 46 }; 47 48 static u32 vhost_transport_get_local_cid(void) 49 { 50 return VHOST_VSOCK_DEFAULT_HOST_CID; 51 } 52 53 static struct vhost_vsock *__vhost_vsock_get(u32 guest_cid) 54 { 55 struct vhost_vsock *vsock; 56 57 list_for_each_entry(vsock, &vhost_vsock_list, list) { 58 u32 other_cid = vsock->guest_cid; 59 60 /* Skip instances that have no CID yet */ 61 if (other_cid == 0) 62 continue; 63 64 if (other_cid == guest_cid) { 65 return vsock; 66 } 67 } 68 69 return NULL; 70 } 71 72 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 73 { 74 struct vhost_vsock *vsock; 75 76 spin_lock_bh(&vhost_vsock_lock); 77 vsock = __vhost_vsock_get(guest_cid); 78 spin_unlock_bh(&vhost_vsock_lock); 79 80 return vsock; 81 } 82 83 static void 84 vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 85 struct vhost_virtqueue *vq) 86 { 87 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 88 bool added = false; 89 bool restart_tx = false; 90 91 mutex_lock(&vq->mutex); 92 93 if (!vq->private_data) 94 goto out; 95 96 /* Avoid further vmexits, we're already processing the virtqueue */ 97 vhost_disable_notify(&vsock->dev, vq); 98 99 for (;;) { 100 struct virtio_vsock_pkt *pkt; 101 struct iov_iter iov_iter; 102 unsigned out, in; 103 size_t nbytes; 104 size_t len; 105 int head; 106 107 spin_lock_bh(&vsock->send_pkt_list_lock); 108 if (list_empty(&vsock->send_pkt_list)) { 109 spin_unlock_bh(&vsock->send_pkt_list_lock); 110 vhost_enable_notify(&vsock->dev, vq); 111 break; 112 } 113 114 pkt = list_first_entry(&vsock->send_pkt_list, 115 struct virtio_vsock_pkt, list); 116 list_del_init(&pkt->list); 117 spin_unlock_bh(&vsock->send_pkt_list_lock); 118 119 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 120 &out, &in, NULL, NULL); 121 if (head < 0) { 122 spin_lock_bh(&vsock->send_pkt_list_lock); 123 list_add(&pkt->list, &vsock->send_pkt_list); 124 spin_unlock_bh(&vsock->send_pkt_list_lock); 125 break; 126 } 127 128 if (head == vq->num) { 129 spin_lock_bh(&vsock->send_pkt_list_lock); 130 list_add(&pkt->list, &vsock->send_pkt_list); 131 spin_unlock_bh(&vsock->send_pkt_list_lock); 132 133 /* We cannot finish yet if more buffers snuck in while 134 * re-enabling notify. 135 */ 136 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 137 vhost_disable_notify(&vsock->dev, vq); 138 continue; 139 } 140 break; 141 } 142 143 if (out) { 144 virtio_transport_free_pkt(pkt); 145 vq_err(vq, "Expected 0 output buffers, got %u\n", out); 146 break; 147 } 148 149 len = iov_length(&vq->iov[out], in); 150 iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len); 151 152 nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 153 if (nbytes != sizeof(pkt->hdr)) { 154 virtio_transport_free_pkt(pkt); 155 vq_err(vq, "Faulted on copying pkt hdr\n"); 156 break; 157 } 158 159 nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter); 160 if (nbytes != pkt->len) { 161 virtio_transport_free_pkt(pkt); 162 vq_err(vq, "Faulted on copying pkt buf\n"); 163 break; 164 } 165 166 vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); 167 added = true; 168 169 if (pkt->reply) { 170 int val; 171 172 val = atomic_dec_return(&vsock->queued_replies); 173 174 /* Do we have resources to resume tx processing? */ 175 if (val + 1 == tx_vq->num) 176 restart_tx = true; 177 } 178 179 virtio_transport_free_pkt(pkt); 180 } 181 if (added) 182 vhost_signal(&vsock->dev, vq); 183 184 out: 185 mutex_unlock(&vq->mutex); 186 187 if (restart_tx) 188 vhost_poll_queue(&tx_vq->poll); 189 } 190 191 static void vhost_transport_send_pkt_work(struct vhost_work *work) 192 { 193 struct vhost_virtqueue *vq; 194 struct vhost_vsock *vsock; 195 196 vsock = container_of(work, struct vhost_vsock, send_pkt_work); 197 vq = &vsock->vqs[VSOCK_VQ_RX]; 198 199 vhost_transport_do_send_pkt(vsock, vq); 200 } 201 202 static int 203 vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) 204 { 205 struct vhost_vsock *vsock; 206 int len = pkt->len; 207 208 /* Find the vhost_vsock according to guest context id */ 209 vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); 210 if (!vsock) { 211 virtio_transport_free_pkt(pkt); 212 return -ENODEV; 213 } 214 215 if (pkt->reply) 216 atomic_inc(&vsock->queued_replies); 217 218 spin_lock_bh(&vsock->send_pkt_list_lock); 219 list_add_tail(&pkt->list, &vsock->send_pkt_list); 220 spin_unlock_bh(&vsock->send_pkt_list_lock); 221 222 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 223 return len; 224 } 225 226 static int 227 vhost_transport_cancel_pkt(struct vsock_sock *vsk) 228 { 229 struct vhost_vsock *vsock; 230 struct virtio_vsock_pkt *pkt, *n; 231 int cnt = 0; 232 LIST_HEAD(freeme); 233 234 /* Find the vhost_vsock according to guest context id */ 235 vsock = vhost_vsock_get(vsk->remote_addr.svm_cid); 236 if (!vsock) 237 return -ENODEV; 238 239 spin_lock_bh(&vsock->send_pkt_list_lock); 240 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 241 if (pkt->vsk != vsk) 242 continue; 243 list_move(&pkt->list, &freeme); 244 } 245 spin_unlock_bh(&vsock->send_pkt_list_lock); 246 247 list_for_each_entry_safe(pkt, n, &freeme, list) { 248 if (pkt->reply) 249 cnt++; 250 list_del(&pkt->list); 251 virtio_transport_free_pkt(pkt); 252 } 253 254 if (cnt) { 255 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 256 int new_cnt; 257 258 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 259 if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num) 260 vhost_poll_queue(&tx_vq->poll); 261 } 262 263 return 0; 264 } 265 266 static struct virtio_vsock_pkt * 267 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 268 unsigned int out, unsigned int in) 269 { 270 struct virtio_vsock_pkt *pkt; 271 struct iov_iter iov_iter; 272 size_t nbytes; 273 size_t len; 274 275 if (in != 0) { 276 vq_err(vq, "Expected 0 input buffers, got %u\n", in); 277 return NULL; 278 } 279 280 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 281 if (!pkt) 282 return NULL; 283 284 len = iov_length(vq->iov, out); 285 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 286 287 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 288 if (nbytes != sizeof(pkt->hdr)) { 289 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 290 sizeof(pkt->hdr), nbytes); 291 kfree(pkt); 292 return NULL; 293 } 294 295 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 296 pkt->len = le32_to_cpu(pkt->hdr.len); 297 298 /* No payload */ 299 if (!pkt->len) 300 return pkt; 301 302 /* The pkt is too big */ 303 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 304 kfree(pkt); 305 return NULL; 306 } 307 308 pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 309 if (!pkt->buf) { 310 kfree(pkt); 311 return NULL; 312 } 313 314 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 315 if (nbytes != pkt->len) { 316 vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 317 pkt->len, nbytes); 318 virtio_transport_free_pkt(pkt); 319 return NULL; 320 } 321 322 return pkt; 323 } 324 325 /* Is there space left for replies to rx packets? */ 326 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 327 { 328 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 329 int val; 330 331 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 332 val = atomic_read(&vsock->queued_replies); 333 334 return val < vq->num; 335 } 336 337 static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 338 { 339 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 340 poll.work); 341 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 342 dev); 343 struct virtio_vsock_pkt *pkt; 344 int head; 345 unsigned int out, in; 346 bool added = false; 347 348 mutex_lock(&vq->mutex); 349 350 if (!vq->private_data) 351 goto out; 352 353 vhost_disable_notify(&vsock->dev, vq); 354 for (;;) { 355 u32 len; 356 357 if (!vhost_vsock_more_replies(vsock)) { 358 /* Stop tx until the device processes already 359 * pending replies. Leave tx virtqueue 360 * callbacks disabled. 361 */ 362 goto no_more_replies; 363 } 364 365 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 366 &out, &in, NULL, NULL); 367 if (head < 0) 368 break; 369 370 if (head == vq->num) { 371 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 372 vhost_disable_notify(&vsock->dev, vq); 373 continue; 374 } 375 break; 376 } 377 378 pkt = vhost_vsock_alloc_pkt(vq, out, in); 379 if (!pkt) { 380 vq_err(vq, "Faulted on pkt\n"); 381 continue; 382 } 383 384 len = pkt->len; 385 386 /* Only accept correctly addressed packets */ 387 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 388 virtio_transport_recv_pkt(pkt); 389 else 390 virtio_transport_free_pkt(pkt); 391 392 vhost_add_used(vq, head, sizeof(pkt->hdr) + len); 393 added = true; 394 } 395 396 no_more_replies: 397 if (added) 398 vhost_signal(&vsock->dev, vq); 399 400 out: 401 mutex_unlock(&vq->mutex); 402 } 403 404 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 405 { 406 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 407 poll.work); 408 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 409 dev); 410 411 vhost_transport_do_send_pkt(vsock, vq); 412 } 413 414 static int vhost_vsock_start(struct vhost_vsock *vsock) 415 { 416 struct vhost_virtqueue *vq; 417 size_t i; 418 int ret; 419 420 mutex_lock(&vsock->dev.mutex); 421 422 ret = vhost_dev_check_owner(&vsock->dev); 423 if (ret) 424 goto err; 425 426 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 427 vq = &vsock->vqs[i]; 428 429 mutex_lock(&vq->mutex); 430 431 if (!vhost_vq_access_ok(vq)) { 432 ret = -EFAULT; 433 goto err_vq; 434 } 435 436 if (!vq->private_data) { 437 vq->private_data = vsock; 438 ret = vhost_vq_init_access(vq); 439 if (ret) 440 goto err_vq; 441 } 442 443 mutex_unlock(&vq->mutex); 444 } 445 446 mutex_unlock(&vsock->dev.mutex); 447 return 0; 448 449 err_vq: 450 vq->private_data = NULL; 451 mutex_unlock(&vq->mutex); 452 453 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 454 vq = &vsock->vqs[i]; 455 456 mutex_lock(&vq->mutex); 457 vq->private_data = NULL; 458 mutex_unlock(&vq->mutex); 459 } 460 err: 461 mutex_unlock(&vsock->dev.mutex); 462 return ret; 463 } 464 465 static int vhost_vsock_stop(struct vhost_vsock *vsock) 466 { 467 size_t i; 468 int ret; 469 470 mutex_lock(&vsock->dev.mutex); 471 472 ret = vhost_dev_check_owner(&vsock->dev); 473 if (ret) 474 goto err; 475 476 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 477 struct vhost_virtqueue *vq = &vsock->vqs[i]; 478 479 mutex_lock(&vq->mutex); 480 vq->private_data = NULL; 481 mutex_unlock(&vq->mutex); 482 } 483 484 err: 485 mutex_unlock(&vsock->dev.mutex); 486 return ret; 487 } 488 489 static void vhost_vsock_free(struct vhost_vsock *vsock) 490 { 491 kvfree(vsock); 492 } 493 494 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 495 { 496 struct vhost_virtqueue **vqs; 497 struct vhost_vsock *vsock; 498 int ret; 499 500 /* This struct is large and allocation could fail, fall back to vmalloc 501 * if there is no other way. 502 */ 503 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); 504 if (!vsock) { 505 vsock = vmalloc(sizeof(*vsock)); 506 if (!vsock) 507 return -ENOMEM; 508 } 509 510 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 511 if (!vqs) { 512 ret = -ENOMEM; 513 goto out; 514 } 515 516 atomic_set(&vsock->queued_replies, 0); 517 518 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 519 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 520 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 521 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 522 523 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs)); 524 525 file->private_data = vsock; 526 spin_lock_init(&vsock->send_pkt_list_lock); 527 INIT_LIST_HEAD(&vsock->send_pkt_list); 528 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 529 530 spin_lock_bh(&vhost_vsock_lock); 531 list_add_tail(&vsock->list, &vhost_vsock_list); 532 spin_unlock_bh(&vhost_vsock_lock); 533 return 0; 534 535 out: 536 vhost_vsock_free(vsock); 537 return ret; 538 } 539 540 static void vhost_vsock_flush(struct vhost_vsock *vsock) 541 { 542 int i; 543 544 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 545 if (vsock->vqs[i].handle_kick) 546 vhost_poll_flush(&vsock->vqs[i].poll); 547 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 548 } 549 550 static void vhost_vsock_reset_orphans(struct sock *sk) 551 { 552 struct vsock_sock *vsk = vsock_sk(sk); 553 554 /* vmci_transport.c doesn't take sk_lock here either. At least we're 555 * under vsock_table_lock so the sock cannot disappear while we're 556 * executing. 557 */ 558 559 if (!vhost_vsock_get(vsk->remote_addr.svm_cid)) { 560 sock_set_flag(sk, SOCK_DONE); 561 vsk->peer_shutdown = SHUTDOWN_MASK; 562 sk->sk_state = SS_UNCONNECTED; 563 sk->sk_err = ECONNRESET; 564 sk->sk_error_report(sk); 565 } 566 } 567 568 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 569 { 570 struct vhost_vsock *vsock = file->private_data; 571 572 spin_lock_bh(&vhost_vsock_lock); 573 list_del(&vsock->list); 574 spin_unlock_bh(&vhost_vsock_lock); 575 576 /* Iterating over all connections for all CIDs to find orphans is 577 * inefficient. Room for improvement here. */ 578 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 579 580 vhost_vsock_stop(vsock); 581 vhost_vsock_flush(vsock); 582 vhost_dev_stop(&vsock->dev); 583 584 spin_lock_bh(&vsock->send_pkt_list_lock); 585 while (!list_empty(&vsock->send_pkt_list)) { 586 struct virtio_vsock_pkt *pkt; 587 588 pkt = list_first_entry(&vsock->send_pkt_list, 589 struct virtio_vsock_pkt, list); 590 list_del_init(&pkt->list); 591 virtio_transport_free_pkt(pkt); 592 } 593 spin_unlock_bh(&vsock->send_pkt_list_lock); 594 595 vhost_dev_cleanup(&vsock->dev, false); 596 kfree(vsock->dev.vqs); 597 vhost_vsock_free(vsock); 598 return 0; 599 } 600 601 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 602 { 603 struct vhost_vsock *other; 604 605 /* Refuse reserved CIDs */ 606 if (guest_cid <= VMADDR_CID_HOST || 607 guest_cid == U32_MAX) 608 return -EINVAL; 609 610 /* 64-bit CIDs are not yet supported */ 611 if (guest_cid > U32_MAX) 612 return -EINVAL; 613 614 /* Refuse if CID is already in use */ 615 spin_lock_bh(&vhost_vsock_lock); 616 other = __vhost_vsock_get(guest_cid); 617 if (other && other != vsock) { 618 spin_unlock_bh(&vhost_vsock_lock); 619 return -EADDRINUSE; 620 } 621 vsock->guest_cid = guest_cid; 622 spin_unlock_bh(&vhost_vsock_lock); 623 624 return 0; 625 } 626 627 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 628 { 629 struct vhost_virtqueue *vq; 630 int i; 631 632 if (features & ~VHOST_VSOCK_FEATURES) 633 return -EOPNOTSUPP; 634 635 mutex_lock(&vsock->dev.mutex); 636 if ((features & (1 << VHOST_F_LOG_ALL)) && 637 !vhost_log_access_ok(&vsock->dev)) { 638 mutex_unlock(&vsock->dev.mutex); 639 return -EFAULT; 640 } 641 642 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 643 vq = &vsock->vqs[i]; 644 mutex_lock(&vq->mutex); 645 vq->acked_features = features; 646 mutex_unlock(&vq->mutex); 647 } 648 mutex_unlock(&vsock->dev.mutex); 649 return 0; 650 } 651 652 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 653 unsigned long arg) 654 { 655 struct vhost_vsock *vsock = f->private_data; 656 void __user *argp = (void __user *)arg; 657 u64 guest_cid; 658 u64 features; 659 int start; 660 int r; 661 662 switch (ioctl) { 663 case VHOST_VSOCK_SET_GUEST_CID: 664 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 665 return -EFAULT; 666 return vhost_vsock_set_cid(vsock, guest_cid); 667 case VHOST_VSOCK_SET_RUNNING: 668 if (copy_from_user(&start, argp, sizeof(start))) 669 return -EFAULT; 670 if (start) 671 return vhost_vsock_start(vsock); 672 else 673 return vhost_vsock_stop(vsock); 674 case VHOST_GET_FEATURES: 675 features = VHOST_VSOCK_FEATURES; 676 if (copy_to_user(argp, &features, sizeof(features))) 677 return -EFAULT; 678 return 0; 679 case VHOST_SET_FEATURES: 680 if (copy_from_user(&features, argp, sizeof(features))) 681 return -EFAULT; 682 return vhost_vsock_set_features(vsock, features); 683 default: 684 mutex_lock(&vsock->dev.mutex); 685 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 686 if (r == -ENOIOCTLCMD) 687 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 688 else 689 vhost_vsock_flush(vsock); 690 mutex_unlock(&vsock->dev.mutex); 691 return r; 692 } 693 } 694 695 static const struct file_operations vhost_vsock_fops = { 696 .owner = THIS_MODULE, 697 .open = vhost_vsock_dev_open, 698 .release = vhost_vsock_dev_release, 699 .llseek = noop_llseek, 700 .unlocked_ioctl = vhost_vsock_dev_ioctl, 701 }; 702 703 static struct miscdevice vhost_vsock_misc = { 704 .minor = MISC_DYNAMIC_MINOR, 705 .name = "vhost-vsock", 706 .fops = &vhost_vsock_fops, 707 }; 708 709 static struct virtio_transport vhost_transport = { 710 .transport = { 711 .get_local_cid = vhost_transport_get_local_cid, 712 713 .init = virtio_transport_do_socket_init, 714 .destruct = virtio_transport_destruct, 715 .release = virtio_transport_release, 716 .connect = virtio_transport_connect, 717 .shutdown = virtio_transport_shutdown, 718 .cancel_pkt = vhost_transport_cancel_pkt, 719 720 .dgram_enqueue = virtio_transport_dgram_enqueue, 721 .dgram_dequeue = virtio_transport_dgram_dequeue, 722 .dgram_bind = virtio_transport_dgram_bind, 723 .dgram_allow = virtio_transport_dgram_allow, 724 725 .stream_enqueue = virtio_transport_stream_enqueue, 726 .stream_dequeue = virtio_transport_stream_dequeue, 727 .stream_has_data = virtio_transport_stream_has_data, 728 .stream_has_space = virtio_transport_stream_has_space, 729 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 730 .stream_is_active = virtio_transport_stream_is_active, 731 .stream_allow = virtio_transport_stream_allow, 732 733 .notify_poll_in = virtio_transport_notify_poll_in, 734 .notify_poll_out = virtio_transport_notify_poll_out, 735 .notify_recv_init = virtio_transport_notify_recv_init, 736 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 737 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 738 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 739 .notify_send_init = virtio_transport_notify_send_init, 740 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 741 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 742 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 743 744 .set_buffer_size = virtio_transport_set_buffer_size, 745 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 746 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 747 .get_buffer_size = virtio_transport_get_buffer_size, 748 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 749 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 750 }, 751 752 .send_pkt = vhost_transport_send_pkt, 753 }; 754 755 static int __init vhost_vsock_init(void) 756 { 757 int ret; 758 759 ret = vsock_core_init(&vhost_transport.transport); 760 if (ret < 0) 761 return ret; 762 return misc_register(&vhost_vsock_misc); 763 }; 764 765 static void __exit vhost_vsock_exit(void) 766 { 767 misc_deregister(&vhost_vsock_misc); 768 vsock_core_exit(); 769 }; 770 771 module_init(vhost_vsock_init); 772 module_exit(vhost_vsock_exit); 773 MODULE_LICENSE("GPL v2"); 774 MODULE_AUTHOR("Asias He"); 775 MODULE_DESCRIPTION("vhost transport for vsock "); 776