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