1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * virtio transport for vsock 4 * 5 * Copyright (C) 2013-2015 Red Hat, Inc. 6 * Author: Asias He <asias@redhat.com> 7 * Stefan Hajnoczi <stefanha@redhat.com> 8 * 9 * Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s 10 * early virtio-vsock proof-of-concept bits. 11 */ 12 #include <linux/spinlock.h> 13 #include <linux/module.h> 14 #include <linux/list.h> 15 #include <linux/atomic.h> 16 #include <linux/virtio.h> 17 #include <linux/virtio_ids.h> 18 #include <linux/virtio_config.h> 19 #include <linux/virtio_vsock.h> 20 #include <net/sock.h> 21 #include <linux/mutex.h> 22 #include <net/af_vsock.h> 23 24 static struct workqueue_struct *virtio_vsock_workqueue; 25 static struct virtio_vsock *the_virtio_vsock; 26 static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */ 27 28 struct virtio_vsock { 29 struct virtio_device *vdev; 30 struct virtqueue *vqs[VSOCK_VQ_MAX]; 31 32 /* Virtqueue processing is deferred to a workqueue */ 33 struct work_struct tx_work; 34 struct work_struct rx_work; 35 struct work_struct event_work; 36 37 /* The following fields are protected by tx_lock. vqs[VSOCK_VQ_TX] 38 * must be accessed with tx_lock held. 39 */ 40 struct mutex tx_lock; 41 42 struct work_struct send_pkt_work; 43 spinlock_t send_pkt_list_lock; 44 struct list_head send_pkt_list; 45 46 struct work_struct loopback_work; 47 spinlock_t loopback_list_lock; /* protects loopback_list */ 48 struct list_head loopback_list; 49 50 atomic_t queued_replies; 51 52 /* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX] 53 * must be accessed with rx_lock held. 54 */ 55 struct mutex rx_lock; 56 int rx_buf_nr; 57 int rx_buf_max_nr; 58 59 /* The following fields are protected by event_lock. 60 * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. 61 */ 62 struct mutex event_lock; 63 struct virtio_vsock_event event_list[8]; 64 65 u32 guest_cid; 66 }; 67 68 static struct virtio_vsock *virtio_vsock_get(void) 69 { 70 return the_virtio_vsock; 71 } 72 73 static u32 virtio_transport_get_local_cid(void) 74 { 75 struct virtio_vsock *vsock = virtio_vsock_get(); 76 77 if (!vsock) 78 return VMADDR_CID_ANY; 79 80 return vsock->guest_cid; 81 } 82 83 static void virtio_transport_loopback_work(struct work_struct *work) 84 { 85 struct virtio_vsock *vsock = 86 container_of(work, struct virtio_vsock, loopback_work); 87 LIST_HEAD(pkts); 88 89 spin_lock_bh(&vsock->loopback_list_lock); 90 list_splice_init(&vsock->loopback_list, &pkts); 91 spin_unlock_bh(&vsock->loopback_list_lock); 92 93 mutex_lock(&vsock->rx_lock); 94 while (!list_empty(&pkts)) { 95 struct virtio_vsock_pkt *pkt; 96 97 pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list); 98 list_del_init(&pkt->list); 99 100 virtio_transport_recv_pkt(pkt); 101 } 102 mutex_unlock(&vsock->rx_lock); 103 } 104 105 static int virtio_transport_send_pkt_loopback(struct virtio_vsock *vsock, 106 struct virtio_vsock_pkt *pkt) 107 { 108 int len = pkt->len; 109 110 spin_lock_bh(&vsock->loopback_list_lock); 111 list_add_tail(&pkt->list, &vsock->loopback_list); 112 spin_unlock_bh(&vsock->loopback_list_lock); 113 114 queue_work(virtio_vsock_workqueue, &vsock->loopback_work); 115 116 return len; 117 } 118 119 static void 120 virtio_transport_send_pkt_work(struct work_struct *work) 121 { 122 struct virtio_vsock *vsock = 123 container_of(work, struct virtio_vsock, send_pkt_work); 124 struct virtqueue *vq; 125 bool added = false; 126 bool restart_rx = false; 127 128 mutex_lock(&vsock->tx_lock); 129 130 vq = vsock->vqs[VSOCK_VQ_TX]; 131 132 for (;;) { 133 struct virtio_vsock_pkt *pkt; 134 struct scatterlist hdr, buf, *sgs[2]; 135 int ret, in_sg = 0, out_sg = 0; 136 bool reply; 137 138 spin_lock_bh(&vsock->send_pkt_list_lock); 139 if (list_empty(&vsock->send_pkt_list)) { 140 spin_unlock_bh(&vsock->send_pkt_list_lock); 141 break; 142 } 143 144 pkt = list_first_entry(&vsock->send_pkt_list, 145 struct virtio_vsock_pkt, list); 146 list_del_init(&pkt->list); 147 spin_unlock_bh(&vsock->send_pkt_list_lock); 148 149 virtio_transport_deliver_tap_pkt(pkt); 150 151 reply = pkt->reply; 152 153 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); 154 sgs[out_sg++] = &hdr; 155 if (pkt->buf) { 156 sg_init_one(&buf, pkt->buf, pkt->len); 157 sgs[out_sg++] = &buf; 158 } 159 160 ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL); 161 /* Usually this means that there is no more space available in 162 * the vq 163 */ 164 if (ret < 0) { 165 spin_lock_bh(&vsock->send_pkt_list_lock); 166 list_add(&pkt->list, &vsock->send_pkt_list); 167 spin_unlock_bh(&vsock->send_pkt_list_lock); 168 break; 169 } 170 171 if (reply) { 172 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; 173 int val; 174 175 val = atomic_dec_return(&vsock->queued_replies); 176 177 /* Do we now have resources to resume rx processing? */ 178 if (val + 1 == virtqueue_get_vring_size(rx_vq)) 179 restart_rx = true; 180 } 181 182 added = true; 183 } 184 185 if (added) 186 virtqueue_kick(vq); 187 188 mutex_unlock(&vsock->tx_lock); 189 190 if (restart_rx) 191 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 192 } 193 194 static int 195 virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) 196 { 197 struct virtio_vsock *vsock; 198 int len = pkt->len; 199 200 vsock = virtio_vsock_get(); 201 if (!vsock) { 202 virtio_transport_free_pkt(pkt); 203 return -ENODEV; 204 } 205 206 if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) 207 return virtio_transport_send_pkt_loopback(vsock, pkt); 208 209 if (pkt->reply) 210 atomic_inc(&vsock->queued_replies); 211 212 spin_lock_bh(&vsock->send_pkt_list_lock); 213 list_add_tail(&pkt->list, &vsock->send_pkt_list); 214 spin_unlock_bh(&vsock->send_pkt_list_lock); 215 216 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); 217 return len; 218 } 219 220 static int 221 virtio_transport_cancel_pkt(struct vsock_sock *vsk) 222 { 223 struct virtio_vsock *vsock; 224 struct virtio_vsock_pkt *pkt, *n; 225 int cnt = 0; 226 LIST_HEAD(freeme); 227 228 vsock = virtio_vsock_get(); 229 if (!vsock) { 230 return -ENODEV; 231 } 232 233 spin_lock_bh(&vsock->send_pkt_list_lock); 234 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 235 if (pkt->vsk != vsk) 236 continue; 237 list_move(&pkt->list, &freeme); 238 } 239 spin_unlock_bh(&vsock->send_pkt_list_lock); 240 241 list_for_each_entry_safe(pkt, n, &freeme, list) { 242 if (pkt->reply) 243 cnt++; 244 list_del(&pkt->list); 245 virtio_transport_free_pkt(pkt); 246 } 247 248 if (cnt) { 249 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; 250 int new_cnt; 251 252 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 253 if (new_cnt + cnt >= virtqueue_get_vring_size(rx_vq) && 254 new_cnt < virtqueue_get_vring_size(rx_vq)) 255 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 256 } 257 258 return 0; 259 } 260 261 static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) 262 { 263 int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; 264 struct virtio_vsock_pkt *pkt; 265 struct scatterlist hdr, buf, *sgs[2]; 266 struct virtqueue *vq; 267 int ret; 268 269 vq = vsock->vqs[VSOCK_VQ_RX]; 270 271 do { 272 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 273 if (!pkt) 274 break; 275 276 pkt->buf = kmalloc(buf_len, GFP_KERNEL); 277 if (!pkt->buf) { 278 virtio_transport_free_pkt(pkt); 279 break; 280 } 281 282 pkt->len = buf_len; 283 284 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); 285 sgs[0] = &hdr; 286 287 sg_init_one(&buf, pkt->buf, buf_len); 288 sgs[1] = &buf; 289 ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL); 290 if (ret) { 291 virtio_transport_free_pkt(pkt); 292 break; 293 } 294 vsock->rx_buf_nr++; 295 } while (vq->num_free); 296 if (vsock->rx_buf_nr > vsock->rx_buf_max_nr) 297 vsock->rx_buf_max_nr = vsock->rx_buf_nr; 298 virtqueue_kick(vq); 299 } 300 301 static void virtio_transport_tx_work(struct work_struct *work) 302 { 303 struct virtio_vsock *vsock = 304 container_of(work, struct virtio_vsock, tx_work); 305 struct virtqueue *vq; 306 bool added = false; 307 308 vq = vsock->vqs[VSOCK_VQ_TX]; 309 mutex_lock(&vsock->tx_lock); 310 do { 311 struct virtio_vsock_pkt *pkt; 312 unsigned int len; 313 314 virtqueue_disable_cb(vq); 315 while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) { 316 virtio_transport_free_pkt(pkt); 317 added = true; 318 } 319 } while (!virtqueue_enable_cb(vq)); 320 mutex_unlock(&vsock->tx_lock); 321 322 if (added) 323 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); 324 } 325 326 /* Is there space left for replies to rx packets? */ 327 static bool virtio_transport_more_replies(struct virtio_vsock *vsock) 328 { 329 struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX]; 330 int val; 331 332 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 333 val = atomic_read(&vsock->queued_replies); 334 335 return val < virtqueue_get_vring_size(vq); 336 } 337 338 static void virtio_transport_rx_work(struct work_struct *work) 339 { 340 struct virtio_vsock *vsock = 341 container_of(work, struct virtio_vsock, rx_work); 342 struct virtqueue *vq; 343 344 vq = vsock->vqs[VSOCK_VQ_RX]; 345 346 mutex_lock(&vsock->rx_lock); 347 348 do { 349 virtqueue_disable_cb(vq); 350 for (;;) { 351 struct virtio_vsock_pkt *pkt; 352 unsigned int len; 353 354 if (!virtio_transport_more_replies(vsock)) { 355 /* Stop rx until the device processes already 356 * pending replies. Leave rx virtqueue 357 * callbacks disabled. 358 */ 359 goto out; 360 } 361 362 pkt = virtqueue_get_buf(vq, &len); 363 if (!pkt) { 364 break; 365 } 366 367 vsock->rx_buf_nr--; 368 369 /* Drop short/long packets */ 370 if (unlikely(len < sizeof(pkt->hdr) || 371 len > sizeof(pkt->hdr) + pkt->len)) { 372 virtio_transport_free_pkt(pkt); 373 continue; 374 } 375 376 pkt->len = len - sizeof(pkt->hdr); 377 virtio_transport_deliver_tap_pkt(pkt); 378 virtio_transport_recv_pkt(pkt); 379 } 380 } while (!virtqueue_enable_cb(vq)); 381 382 out: 383 if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) 384 virtio_vsock_rx_fill(vsock); 385 mutex_unlock(&vsock->rx_lock); 386 } 387 388 /* event_lock must be held */ 389 static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock, 390 struct virtio_vsock_event *event) 391 { 392 struct scatterlist sg; 393 struct virtqueue *vq; 394 395 vq = vsock->vqs[VSOCK_VQ_EVENT]; 396 397 sg_init_one(&sg, event, sizeof(*event)); 398 399 return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL); 400 } 401 402 /* event_lock must be held */ 403 static void virtio_vsock_event_fill(struct virtio_vsock *vsock) 404 { 405 size_t i; 406 407 for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) { 408 struct virtio_vsock_event *event = &vsock->event_list[i]; 409 410 virtio_vsock_event_fill_one(vsock, event); 411 } 412 413 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); 414 } 415 416 static void virtio_vsock_reset_sock(struct sock *sk) 417 { 418 lock_sock(sk); 419 sk->sk_state = TCP_CLOSE; 420 sk->sk_err = ECONNRESET; 421 sk->sk_error_report(sk); 422 release_sock(sk); 423 } 424 425 static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock) 426 { 427 struct virtio_device *vdev = vsock->vdev; 428 __le64 guest_cid; 429 430 vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid), 431 &guest_cid, sizeof(guest_cid)); 432 vsock->guest_cid = le64_to_cpu(guest_cid); 433 } 434 435 /* event_lock must be held */ 436 static void virtio_vsock_event_handle(struct virtio_vsock *vsock, 437 struct virtio_vsock_event *event) 438 { 439 switch (le32_to_cpu(event->id)) { 440 case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET: 441 virtio_vsock_update_guest_cid(vsock); 442 vsock_for_each_connected_socket(virtio_vsock_reset_sock); 443 break; 444 } 445 } 446 447 static void virtio_transport_event_work(struct work_struct *work) 448 { 449 struct virtio_vsock *vsock = 450 container_of(work, struct virtio_vsock, event_work); 451 struct virtqueue *vq; 452 453 vq = vsock->vqs[VSOCK_VQ_EVENT]; 454 455 mutex_lock(&vsock->event_lock); 456 457 do { 458 struct virtio_vsock_event *event; 459 unsigned int len; 460 461 virtqueue_disable_cb(vq); 462 while ((event = virtqueue_get_buf(vq, &len)) != NULL) { 463 if (len == sizeof(*event)) 464 virtio_vsock_event_handle(vsock, event); 465 466 virtio_vsock_event_fill_one(vsock, event); 467 } 468 } while (!virtqueue_enable_cb(vq)); 469 470 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); 471 472 mutex_unlock(&vsock->event_lock); 473 } 474 475 static void virtio_vsock_event_done(struct virtqueue *vq) 476 { 477 struct virtio_vsock *vsock = vq->vdev->priv; 478 479 if (!vsock) 480 return; 481 queue_work(virtio_vsock_workqueue, &vsock->event_work); 482 } 483 484 static void virtio_vsock_tx_done(struct virtqueue *vq) 485 { 486 struct virtio_vsock *vsock = vq->vdev->priv; 487 488 if (!vsock) 489 return; 490 queue_work(virtio_vsock_workqueue, &vsock->tx_work); 491 } 492 493 static void virtio_vsock_rx_done(struct virtqueue *vq) 494 { 495 struct virtio_vsock *vsock = vq->vdev->priv; 496 497 if (!vsock) 498 return; 499 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 500 } 501 502 static struct virtio_transport virtio_transport = { 503 .transport = { 504 .get_local_cid = virtio_transport_get_local_cid, 505 506 .init = virtio_transport_do_socket_init, 507 .destruct = virtio_transport_destruct, 508 .release = virtio_transport_release, 509 .connect = virtio_transport_connect, 510 .shutdown = virtio_transport_shutdown, 511 .cancel_pkt = virtio_transport_cancel_pkt, 512 513 .dgram_bind = virtio_transport_dgram_bind, 514 .dgram_dequeue = virtio_transport_dgram_dequeue, 515 .dgram_enqueue = virtio_transport_dgram_enqueue, 516 .dgram_allow = virtio_transport_dgram_allow, 517 518 .stream_dequeue = virtio_transport_stream_dequeue, 519 .stream_enqueue = virtio_transport_stream_enqueue, 520 .stream_has_data = virtio_transport_stream_has_data, 521 .stream_has_space = virtio_transport_stream_has_space, 522 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 523 .stream_is_active = virtio_transport_stream_is_active, 524 .stream_allow = virtio_transport_stream_allow, 525 526 .notify_poll_in = virtio_transport_notify_poll_in, 527 .notify_poll_out = virtio_transport_notify_poll_out, 528 .notify_recv_init = virtio_transport_notify_recv_init, 529 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 530 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 531 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 532 .notify_send_init = virtio_transport_notify_send_init, 533 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 534 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 535 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 536 537 .set_buffer_size = virtio_transport_set_buffer_size, 538 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 539 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 540 .get_buffer_size = virtio_transport_get_buffer_size, 541 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 542 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 543 }, 544 545 .send_pkt = virtio_transport_send_pkt, 546 }; 547 548 static int virtio_vsock_probe(struct virtio_device *vdev) 549 { 550 vq_callback_t *callbacks[] = { 551 virtio_vsock_rx_done, 552 virtio_vsock_tx_done, 553 virtio_vsock_event_done, 554 }; 555 static const char * const names[] = { 556 "rx", 557 "tx", 558 "event", 559 }; 560 struct virtio_vsock *vsock = NULL; 561 int ret; 562 563 ret = mutex_lock_interruptible(&the_virtio_vsock_mutex); 564 if (ret) 565 return ret; 566 567 /* Only one virtio-vsock device per guest is supported */ 568 if (the_virtio_vsock) { 569 ret = -EBUSY; 570 goto out; 571 } 572 573 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL); 574 if (!vsock) { 575 ret = -ENOMEM; 576 goto out; 577 } 578 579 vsock->vdev = vdev; 580 581 ret = virtio_find_vqs(vsock->vdev, VSOCK_VQ_MAX, 582 vsock->vqs, callbacks, names, 583 NULL); 584 if (ret < 0) 585 goto out; 586 587 virtio_vsock_update_guest_cid(vsock); 588 589 vsock->rx_buf_nr = 0; 590 vsock->rx_buf_max_nr = 0; 591 atomic_set(&vsock->queued_replies, 0); 592 593 vdev->priv = vsock; 594 the_virtio_vsock = vsock; 595 mutex_init(&vsock->tx_lock); 596 mutex_init(&vsock->rx_lock); 597 mutex_init(&vsock->event_lock); 598 spin_lock_init(&vsock->send_pkt_list_lock); 599 INIT_LIST_HEAD(&vsock->send_pkt_list); 600 spin_lock_init(&vsock->loopback_list_lock); 601 INIT_LIST_HEAD(&vsock->loopback_list); 602 INIT_WORK(&vsock->rx_work, virtio_transport_rx_work); 603 INIT_WORK(&vsock->tx_work, virtio_transport_tx_work); 604 INIT_WORK(&vsock->event_work, virtio_transport_event_work); 605 INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work); 606 INIT_WORK(&vsock->loopback_work, virtio_transport_loopback_work); 607 608 mutex_lock(&vsock->rx_lock); 609 virtio_vsock_rx_fill(vsock); 610 mutex_unlock(&vsock->rx_lock); 611 612 mutex_lock(&vsock->event_lock); 613 virtio_vsock_event_fill(vsock); 614 mutex_unlock(&vsock->event_lock); 615 616 mutex_unlock(&the_virtio_vsock_mutex); 617 return 0; 618 619 out: 620 kfree(vsock); 621 mutex_unlock(&the_virtio_vsock_mutex); 622 return ret; 623 } 624 625 static void virtio_vsock_remove(struct virtio_device *vdev) 626 { 627 struct virtio_vsock *vsock = vdev->priv; 628 struct virtio_vsock_pkt *pkt; 629 630 flush_work(&vsock->loopback_work); 631 flush_work(&vsock->rx_work); 632 flush_work(&vsock->tx_work); 633 flush_work(&vsock->event_work); 634 flush_work(&vsock->send_pkt_work); 635 636 /* Reset all connected sockets when the device disappear */ 637 vsock_for_each_connected_socket(virtio_vsock_reset_sock); 638 639 vdev->config->reset(vdev); 640 641 mutex_lock(&vsock->rx_lock); 642 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX]))) 643 virtio_transport_free_pkt(pkt); 644 mutex_unlock(&vsock->rx_lock); 645 646 mutex_lock(&vsock->tx_lock); 647 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX]))) 648 virtio_transport_free_pkt(pkt); 649 mutex_unlock(&vsock->tx_lock); 650 651 spin_lock_bh(&vsock->send_pkt_list_lock); 652 while (!list_empty(&vsock->send_pkt_list)) { 653 pkt = list_first_entry(&vsock->send_pkt_list, 654 struct virtio_vsock_pkt, list); 655 list_del(&pkt->list); 656 virtio_transport_free_pkt(pkt); 657 } 658 spin_unlock_bh(&vsock->send_pkt_list_lock); 659 660 spin_lock_bh(&vsock->loopback_list_lock); 661 while (!list_empty(&vsock->loopback_list)) { 662 pkt = list_first_entry(&vsock->loopback_list, 663 struct virtio_vsock_pkt, list); 664 list_del(&pkt->list); 665 virtio_transport_free_pkt(pkt); 666 } 667 spin_unlock_bh(&vsock->loopback_list_lock); 668 669 mutex_lock(&the_virtio_vsock_mutex); 670 the_virtio_vsock = NULL; 671 mutex_unlock(&the_virtio_vsock_mutex); 672 673 vdev->config->del_vqs(vdev); 674 675 kfree(vsock); 676 } 677 678 static struct virtio_device_id id_table[] = { 679 { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID }, 680 { 0 }, 681 }; 682 683 static unsigned int features[] = { 684 }; 685 686 static struct virtio_driver virtio_vsock_driver = { 687 .feature_table = features, 688 .feature_table_size = ARRAY_SIZE(features), 689 .driver.name = KBUILD_MODNAME, 690 .driver.owner = THIS_MODULE, 691 .id_table = id_table, 692 .probe = virtio_vsock_probe, 693 .remove = virtio_vsock_remove, 694 }; 695 696 static int __init virtio_vsock_init(void) 697 { 698 int ret; 699 700 virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0); 701 if (!virtio_vsock_workqueue) 702 return -ENOMEM; 703 704 ret = vsock_core_init(&virtio_transport.transport); 705 if (ret) 706 goto out_wq; 707 708 ret = register_virtio_driver(&virtio_vsock_driver); 709 if (ret) 710 goto out_vci; 711 712 return 0; 713 714 out_vci: 715 vsock_core_exit(); 716 out_wq: 717 destroy_workqueue(virtio_vsock_workqueue); 718 return ret; 719 } 720 721 static void __exit virtio_vsock_exit(void) 722 { 723 unregister_virtio_driver(&virtio_vsock_driver); 724 vsock_core_exit(); 725 destroy_workqueue(virtio_vsock_workqueue); 726 } 727 728 module_init(virtio_vsock_init); 729 module_exit(virtio_vsock_exit); 730 MODULE_LICENSE("GPL v2"); 731 MODULE_AUTHOR("Asias He"); 732 MODULE_DESCRIPTION("virtio transport for vsock"); 733 MODULE_DEVICE_TABLE(virtio, id_table); 734