1 /* 2 * virtio 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 * Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s 9 * early virtio-vsock proof-of-concept bits. 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2. 12 */ 13 #include <linux/spinlock.h> 14 #include <linux/module.h> 15 #include <linux/list.h> 16 #include <linux/atomic.h> 17 #include <linux/virtio.h> 18 #include <linux/virtio_ids.h> 19 #include <linux/virtio_config.h> 20 #include <linux/virtio_vsock.h> 21 #include <net/sock.h> 22 #include <linux/mutex.h> 23 #include <net/af_vsock.h> 24 25 static struct workqueue_struct *virtio_vsock_workqueue; 26 static struct virtio_vsock *the_virtio_vsock; 27 static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */ 28 29 struct virtio_vsock { 30 struct virtio_device *vdev; 31 struct virtqueue *vqs[VSOCK_VQ_MAX]; 32 33 /* Virtqueue processing is deferred to a workqueue */ 34 struct work_struct tx_work; 35 struct work_struct rx_work; 36 struct work_struct event_work; 37 38 /* The following fields are protected by tx_lock. vqs[VSOCK_VQ_TX] 39 * must be accessed with tx_lock held. 40 */ 41 struct mutex tx_lock; 42 43 struct work_struct send_pkt_work; 44 spinlock_t send_pkt_list_lock; 45 struct list_head send_pkt_list; 46 47 struct work_struct loopback_work; 48 spinlock_t loopback_list_lock; /* protects loopback_list */ 49 struct list_head loopback_list; 50 51 atomic_t queued_replies; 52 53 /* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX] 54 * must be accessed with rx_lock held. 55 */ 56 struct mutex rx_lock; 57 int rx_buf_nr; 58 int rx_buf_max_nr; 59 60 /* The following fields are protected by event_lock. 61 * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. 62 */ 63 struct mutex event_lock; 64 struct virtio_vsock_event event_list[8]; 65 66 u32 guest_cid; 67 }; 68 69 static struct virtio_vsock *virtio_vsock_get(void) 70 { 71 return the_virtio_vsock; 72 } 73 74 static u32 virtio_transport_get_local_cid(void) 75 { 76 struct virtio_vsock *vsock = virtio_vsock_get(); 77 78 if (!vsock) 79 return VMADDR_CID_ANY; 80 81 return vsock->guest_cid; 82 } 83 84 static void virtio_transport_loopback_work(struct work_struct *work) 85 { 86 struct virtio_vsock *vsock = 87 container_of(work, struct virtio_vsock, loopback_work); 88 LIST_HEAD(pkts); 89 90 spin_lock_bh(&vsock->loopback_list_lock); 91 list_splice_init(&vsock->loopback_list, &pkts); 92 spin_unlock_bh(&vsock->loopback_list_lock); 93 94 mutex_lock(&vsock->rx_lock); 95 while (!list_empty(&pkts)) { 96 struct virtio_vsock_pkt *pkt; 97 98 pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list); 99 list_del_init(&pkt->list); 100 101 virtio_transport_recv_pkt(pkt); 102 } 103 mutex_unlock(&vsock->rx_lock); 104 } 105 106 static int virtio_transport_send_pkt_loopback(struct virtio_vsock *vsock, 107 struct virtio_vsock_pkt *pkt) 108 { 109 int len = pkt->len; 110 111 spin_lock_bh(&vsock->loopback_list_lock); 112 list_add_tail(&pkt->list, &vsock->loopback_list); 113 spin_unlock_bh(&vsock->loopback_list_lock); 114 115 queue_work(virtio_vsock_workqueue, &vsock->loopback_work); 116 117 return len; 118 } 119 120 static void 121 virtio_transport_send_pkt_work(struct work_struct *work) 122 { 123 struct virtio_vsock *vsock = 124 container_of(work, struct virtio_vsock, send_pkt_work); 125 struct virtqueue *vq; 126 bool added = false; 127 bool restart_rx = false; 128 129 mutex_lock(&vsock->tx_lock); 130 131 vq = vsock->vqs[VSOCK_VQ_TX]; 132 133 for (;;) { 134 struct virtio_vsock_pkt *pkt; 135 struct scatterlist hdr, buf, *sgs[2]; 136 int ret, in_sg = 0, out_sg = 0; 137 bool reply; 138 139 spin_lock_bh(&vsock->send_pkt_list_lock); 140 if (list_empty(&vsock->send_pkt_list)) { 141 spin_unlock_bh(&vsock->send_pkt_list_lock); 142 break; 143 } 144 145 pkt = list_first_entry(&vsock->send_pkt_list, 146 struct virtio_vsock_pkt, list); 147 list_del_init(&pkt->list); 148 spin_unlock_bh(&vsock->send_pkt_list_lock); 149 150 virtio_transport_deliver_tap_pkt(pkt); 151 152 reply = pkt->reply; 153 154 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); 155 sgs[out_sg++] = &hdr; 156 if (pkt->buf) { 157 sg_init_one(&buf, pkt->buf, pkt->len); 158 sgs[out_sg++] = &buf; 159 } 160 161 ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL); 162 /* Usually this means that there is no more space available in 163 * the vq 164 */ 165 if (ret < 0) { 166 spin_lock_bh(&vsock->send_pkt_list_lock); 167 list_add(&pkt->list, &vsock->send_pkt_list); 168 spin_unlock_bh(&vsock->send_pkt_list_lock); 169 break; 170 } 171 172 if (reply) { 173 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; 174 int val; 175 176 val = atomic_dec_return(&vsock->queued_replies); 177 178 /* Do we now have resources to resume rx processing? */ 179 if (val + 1 == virtqueue_get_vring_size(rx_vq)) 180 restart_rx = true; 181 } 182 183 added = true; 184 } 185 186 if (added) 187 virtqueue_kick(vq); 188 189 mutex_unlock(&vsock->tx_lock); 190 191 if (restart_rx) 192 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 193 } 194 195 static int 196 virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) 197 { 198 struct virtio_vsock *vsock; 199 int len = pkt->len; 200 201 vsock = virtio_vsock_get(); 202 if (!vsock) { 203 virtio_transport_free_pkt(pkt); 204 return -ENODEV; 205 } 206 207 if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) 208 return virtio_transport_send_pkt_loopback(vsock, pkt); 209 210 if (pkt->reply) 211 atomic_inc(&vsock->queued_replies); 212 213 spin_lock_bh(&vsock->send_pkt_list_lock); 214 list_add_tail(&pkt->list, &vsock->send_pkt_list); 215 spin_unlock_bh(&vsock->send_pkt_list_lock); 216 217 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); 218 return len; 219 } 220 221 static int 222 virtio_transport_cancel_pkt(struct vsock_sock *vsk) 223 { 224 struct virtio_vsock *vsock; 225 struct virtio_vsock_pkt *pkt, *n; 226 int cnt = 0; 227 LIST_HEAD(freeme); 228 229 vsock = virtio_vsock_get(); 230 if (!vsock) { 231 return -ENODEV; 232 } 233 234 spin_lock_bh(&vsock->send_pkt_list_lock); 235 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 236 if (pkt->vsk != vsk) 237 continue; 238 list_move(&pkt->list, &freeme); 239 } 240 spin_unlock_bh(&vsock->send_pkt_list_lock); 241 242 list_for_each_entry_safe(pkt, n, &freeme, list) { 243 if (pkt->reply) 244 cnt++; 245 list_del(&pkt->list); 246 virtio_transport_free_pkt(pkt); 247 } 248 249 if (cnt) { 250 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; 251 int new_cnt; 252 253 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 254 if (new_cnt + cnt >= virtqueue_get_vring_size(rx_vq) && 255 new_cnt < virtqueue_get_vring_size(rx_vq)) 256 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 257 } 258 259 return 0; 260 } 261 262 static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) 263 { 264 int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; 265 struct virtio_vsock_pkt *pkt; 266 struct scatterlist hdr, buf, *sgs[2]; 267 struct virtqueue *vq; 268 int ret; 269 270 vq = vsock->vqs[VSOCK_VQ_RX]; 271 272 do { 273 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 274 if (!pkt) 275 break; 276 277 pkt->buf = kmalloc(buf_len, GFP_KERNEL); 278 if (!pkt->buf) { 279 virtio_transport_free_pkt(pkt); 280 break; 281 } 282 283 pkt->len = buf_len; 284 285 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); 286 sgs[0] = &hdr; 287 288 sg_init_one(&buf, pkt->buf, buf_len); 289 sgs[1] = &buf; 290 ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL); 291 if (ret) { 292 virtio_transport_free_pkt(pkt); 293 break; 294 } 295 vsock->rx_buf_nr++; 296 } while (vq->num_free); 297 if (vsock->rx_buf_nr > vsock->rx_buf_max_nr) 298 vsock->rx_buf_max_nr = vsock->rx_buf_nr; 299 virtqueue_kick(vq); 300 } 301 302 static void virtio_transport_tx_work(struct work_struct *work) 303 { 304 struct virtio_vsock *vsock = 305 container_of(work, struct virtio_vsock, tx_work); 306 struct virtqueue *vq; 307 bool added = false; 308 309 vq = vsock->vqs[VSOCK_VQ_TX]; 310 mutex_lock(&vsock->tx_lock); 311 do { 312 struct virtio_vsock_pkt *pkt; 313 unsigned int len; 314 315 virtqueue_disable_cb(vq); 316 while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) { 317 virtio_transport_free_pkt(pkt); 318 added = true; 319 } 320 } while (!virtqueue_enable_cb(vq)); 321 mutex_unlock(&vsock->tx_lock); 322 323 if (added) 324 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); 325 } 326 327 /* Is there space left for replies to rx packets? */ 328 static bool virtio_transport_more_replies(struct virtio_vsock *vsock) 329 { 330 struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX]; 331 int val; 332 333 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 334 val = atomic_read(&vsock->queued_replies); 335 336 return val < virtqueue_get_vring_size(vq); 337 } 338 339 static void virtio_transport_rx_work(struct work_struct *work) 340 { 341 struct virtio_vsock *vsock = 342 container_of(work, struct virtio_vsock, rx_work); 343 struct virtqueue *vq; 344 345 vq = vsock->vqs[VSOCK_VQ_RX]; 346 347 mutex_lock(&vsock->rx_lock); 348 349 do { 350 virtqueue_disable_cb(vq); 351 for (;;) { 352 struct virtio_vsock_pkt *pkt; 353 unsigned int len; 354 355 if (!virtio_transport_more_replies(vsock)) { 356 /* Stop rx until the device processes already 357 * pending replies. Leave rx virtqueue 358 * callbacks disabled. 359 */ 360 goto out; 361 } 362 363 pkt = virtqueue_get_buf(vq, &len); 364 if (!pkt) { 365 break; 366 } 367 368 vsock->rx_buf_nr--; 369 370 /* Drop short/long packets */ 371 if (unlikely(len < sizeof(pkt->hdr) || 372 len > sizeof(pkt->hdr) + pkt->len)) { 373 virtio_transport_free_pkt(pkt); 374 continue; 375 } 376 377 pkt->len = len - sizeof(pkt->hdr); 378 virtio_transport_deliver_tap_pkt(pkt); 379 virtio_transport_recv_pkt(pkt); 380 } 381 } while (!virtqueue_enable_cb(vq)); 382 383 out: 384 if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) 385 virtio_vsock_rx_fill(vsock); 386 mutex_unlock(&vsock->rx_lock); 387 } 388 389 /* event_lock must be held */ 390 static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock, 391 struct virtio_vsock_event *event) 392 { 393 struct scatterlist sg; 394 struct virtqueue *vq; 395 396 vq = vsock->vqs[VSOCK_VQ_EVENT]; 397 398 sg_init_one(&sg, event, sizeof(*event)); 399 400 return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL); 401 } 402 403 /* event_lock must be held */ 404 static void virtio_vsock_event_fill(struct virtio_vsock *vsock) 405 { 406 size_t i; 407 408 for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) { 409 struct virtio_vsock_event *event = &vsock->event_list[i]; 410 411 virtio_vsock_event_fill_one(vsock, event); 412 } 413 414 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); 415 } 416 417 static void virtio_vsock_reset_sock(struct sock *sk) 418 { 419 lock_sock(sk); 420 sk->sk_state = TCP_CLOSE; 421 sk->sk_err = ECONNRESET; 422 sk->sk_error_report(sk); 423 release_sock(sk); 424 } 425 426 static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock) 427 { 428 struct virtio_device *vdev = vsock->vdev; 429 __le64 guest_cid; 430 431 vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid), 432 &guest_cid, sizeof(guest_cid)); 433 vsock->guest_cid = le64_to_cpu(guest_cid); 434 } 435 436 /* event_lock must be held */ 437 static void virtio_vsock_event_handle(struct virtio_vsock *vsock, 438 struct virtio_vsock_event *event) 439 { 440 switch (le32_to_cpu(event->id)) { 441 case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET: 442 virtio_vsock_update_guest_cid(vsock); 443 vsock_for_each_connected_socket(virtio_vsock_reset_sock); 444 break; 445 } 446 } 447 448 static void virtio_transport_event_work(struct work_struct *work) 449 { 450 struct virtio_vsock *vsock = 451 container_of(work, struct virtio_vsock, event_work); 452 struct virtqueue *vq; 453 454 vq = vsock->vqs[VSOCK_VQ_EVENT]; 455 456 mutex_lock(&vsock->event_lock); 457 458 do { 459 struct virtio_vsock_event *event; 460 unsigned int len; 461 462 virtqueue_disable_cb(vq); 463 while ((event = virtqueue_get_buf(vq, &len)) != NULL) { 464 if (len == sizeof(*event)) 465 virtio_vsock_event_handle(vsock, event); 466 467 virtio_vsock_event_fill_one(vsock, event); 468 } 469 } while (!virtqueue_enable_cb(vq)); 470 471 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); 472 473 mutex_unlock(&vsock->event_lock); 474 } 475 476 static void virtio_vsock_event_done(struct virtqueue *vq) 477 { 478 struct virtio_vsock *vsock = vq->vdev->priv; 479 480 if (!vsock) 481 return; 482 queue_work(virtio_vsock_workqueue, &vsock->event_work); 483 } 484 485 static void virtio_vsock_tx_done(struct virtqueue *vq) 486 { 487 struct virtio_vsock *vsock = vq->vdev->priv; 488 489 if (!vsock) 490 return; 491 queue_work(virtio_vsock_workqueue, &vsock->tx_work); 492 } 493 494 static void virtio_vsock_rx_done(struct virtqueue *vq) 495 { 496 struct virtio_vsock *vsock = vq->vdev->priv; 497 498 if (!vsock) 499 return; 500 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 501 } 502 503 static struct virtio_transport virtio_transport = { 504 .transport = { 505 .get_local_cid = virtio_transport_get_local_cid, 506 507 .init = virtio_transport_do_socket_init, 508 .destruct = virtio_transport_destruct, 509 .release = virtio_transport_release, 510 .connect = virtio_transport_connect, 511 .shutdown = virtio_transport_shutdown, 512 .cancel_pkt = virtio_transport_cancel_pkt, 513 514 .dgram_bind = virtio_transport_dgram_bind, 515 .dgram_dequeue = virtio_transport_dgram_dequeue, 516 .dgram_enqueue = virtio_transport_dgram_enqueue, 517 .dgram_allow = virtio_transport_dgram_allow, 518 519 .stream_dequeue = virtio_transport_stream_dequeue, 520 .stream_enqueue = virtio_transport_stream_enqueue, 521 .stream_has_data = virtio_transport_stream_has_data, 522 .stream_has_space = virtio_transport_stream_has_space, 523 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 524 .stream_is_active = virtio_transport_stream_is_active, 525 .stream_allow = virtio_transport_stream_allow, 526 527 .notify_poll_in = virtio_transport_notify_poll_in, 528 .notify_poll_out = virtio_transport_notify_poll_out, 529 .notify_recv_init = virtio_transport_notify_recv_init, 530 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 531 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 532 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 533 .notify_send_init = virtio_transport_notify_send_init, 534 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 535 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 536 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 537 538 .set_buffer_size = virtio_transport_set_buffer_size, 539 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 540 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 541 .get_buffer_size = virtio_transport_get_buffer_size, 542 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 543 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 544 }, 545 546 .send_pkt = virtio_transport_send_pkt, 547 }; 548 549 static int virtio_vsock_probe(struct virtio_device *vdev) 550 { 551 vq_callback_t *callbacks[] = { 552 virtio_vsock_rx_done, 553 virtio_vsock_tx_done, 554 virtio_vsock_event_done, 555 }; 556 static const char * const names[] = { 557 "rx", 558 "tx", 559 "event", 560 }; 561 struct virtio_vsock *vsock = NULL; 562 int ret; 563 564 ret = mutex_lock_interruptible(&the_virtio_vsock_mutex); 565 if (ret) 566 return ret; 567 568 /* Only one virtio-vsock device per guest is supported */ 569 if (the_virtio_vsock) { 570 ret = -EBUSY; 571 goto out; 572 } 573 574 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL); 575 if (!vsock) { 576 ret = -ENOMEM; 577 goto out; 578 } 579 580 vsock->vdev = vdev; 581 582 ret = virtio_find_vqs(vsock->vdev, VSOCK_VQ_MAX, 583 vsock->vqs, callbacks, names, 584 NULL); 585 if (ret < 0) 586 goto out; 587 588 virtio_vsock_update_guest_cid(vsock); 589 590 vsock->rx_buf_nr = 0; 591 vsock->rx_buf_max_nr = 0; 592 atomic_set(&vsock->queued_replies, 0); 593 594 vdev->priv = vsock; 595 the_virtio_vsock = vsock; 596 mutex_init(&vsock->tx_lock); 597 mutex_init(&vsock->rx_lock); 598 mutex_init(&vsock->event_lock); 599 spin_lock_init(&vsock->send_pkt_list_lock); 600 INIT_LIST_HEAD(&vsock->send_pkt_list); 601 spin_lock_init(&vsock->loopback_list_lock); 602 INIT_LIST_HEAD(&vsock->loopback_list); 603 INIT_WORK(&vsock->rx_work, virtio_transport_rx_work); 604 INIT_WORK(&vsock->tx_work, virtio_transport_tx_work); 605 INIT_WORK(&vsock->event_work, virtio_transport_event_work); 606 INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work); 607 INIT_WORK(&vsock->loopback_work, virtio_transport_loopback_work); 608 609 mutex_lock(&vsock->rx_lock); 610 virtio_vsock_rx_fill(vsock); 611 mutex_unlock(&vsock->rx_lock); 612 613 mutex_lock(&vsock->event_lock); 614 virtio_vsock_event_fill(vsock); 615 mutex_unlock(&vsock->event_lock); 616 617 mutex_unlock(&the_virtio_vsock_mutex); 618 return 0; 619 620 out: 621 kfree(vsock); 622 mutex_unlock(&the_virtio_vsock_mutex); 623 return ret; 624 } 625 626 static void virtio_vsock_remove(struct virtio_device *vdev) 627 { 628 struct virtio_vsock *vsock = vdev->priv; 629 struct virtio_vsock_pkt *pkt; 630 631 flush_work(&vsock->loopback_work); 632 flush_work(&vsock->rx_work); 633 flush_work(&vsock->tx_work); 634 flush_work(&vsock->event_work); 635 flush_work(&vsock->send_pkt_work); 636 637 /* Reset all connected sockets when the device disappear */ 638 vsock_for_each_connected_socket(virtio_vsock_reset_sock); 639 640 vdev->config->reset(vdev); 641 642 mutex_lock(&vsock->rx_lock); 643 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX]))) 644 virtio_transport_free_pkt(pkt); 645 mutex_unlock(&vsock->rx_lock); 646 647 mutex_lock(&vsock->tx_lock); 648 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX]))) 649 virtio_transport_free_pkt(pkt); 650 mutex_unlock(&vsock->tx_lock); 651 652 spin_lock_bh(&vsock->send_pkt_list_lock); 653 while (!list_empty(&vsock->send_pkt_list)) { 654 pkt = list_first_entry(&vsock->send_pkt_list, 655 struct virtio_vsock_pkt, list); 656 list_del(&pkt->list); 657 virtio_transport_free_pkt(pkt); 658 } 659 spin_unlock_bh(&vsock->send_pkt_list_lock); 660 661 spin_lock_bh(&vsock->loopback_list_lock); 662 while (!list_empty(&vsock->loopback_list)) { 663 pkt = list_first_entry(&vsock->loopback_list, 664 struct virtio_vsock_pkt, list); 665 list_del(&pkt->list); 666 virtio_transport_free_pkt(pkt); 667 } 668 spin_unlock_bh(&vsock->loopback_list_lock); 669 670 mutex_lock(&the_virtio_vsock_mutex); 671 the_virtio_vsock = NULL; 672 mutex_unlock(&the_virtio_vsock_mutex); 673 674 vdev->config->del_vqs(vdev); 675 676 kfree(vsock); 677 } 678 679 static struct virtio_device_id id_table[] = { 680 { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID }, 681 { 0 }, 682 }; 683 684 static unsigned int features[] = { 685 }; 686 687 static struct virtio_driver virtio_vsock_driver = { 688 .feature_table = features, 689 .feature_table_size = ARRAY_SIZE(features), 690 .driver.name = KBUILD_MODNAME, 691 .driver.owner = THIS_MODULE, 692 .id_table = id_table, 693 .probe = virtio_vsock_probe, 694 .remove = virtio_vsock_remove, 695 }; 696 697 static int __init virtio_vsock_init(void) 698 { 699 int ret; 700 701 virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0); 702 if (!virtio_vsock_workqueue) 703 return -ENOMEM; 704 705 ret = vsock_core_init(&virtio_transport.transport); 706 if (ret) 707 goto out_wq; 708 709 ret = register_virtio_driver(&virtio_vsock_driver); 710 if (ret) 711 goto out_vci; 712 713 return 0; 714 715 out_vci: 716 vsock_core_exit(); 717 out_wq: 718 destroy_workqueue(virtio_vsock_workqueue); 719 return ret; 720 } 721 722 static void __exit virtio_vsock_exit(void) 723 { 724 unregister_virtio_driver(&virtio_vsock_driver); 725 vsock_core_exit(); 726 destroy_workqueue(virtio_vsock_workqueue); 727 } 728 729 module_init(virtio_vsock_init); 730 module_exit(virtio_vsock_exit); 731 MODULE_LICENSE("GPL v2"); 732 MODULE_AUTHOR("Asias He"); 733 MODULE_DESCRIPTION("virtio transport for vsock"); 734 MODULE_DEVICE_TABLE(virtio, id_table); 735