This source file includes following definitions.
- virtio_transport_get_local_cid
- virtio_transport_loopback_work
- virtio_transport_send_pkt_loopback
- virtio_transport_send_pkt_work
- virtio_transport_send_pkt
- virtio_transport_cancel_pkt
- virtio_vsock_rx_fill
- virtio_transport_tx_work
- virtio_transport_more_replies
- virtio_transport_rx_work
- virtio_vsock_event_fill_one
- virtio_vsock_event_fill
- virtio_vsock_reset_sock
- virtio_vsock_update_guest_cid
- virtio_vsock_event_handle
- virtio_transport_event_work
- virtio_vsock_event_done
- virtio_vsock_tx_done
- virtio_vsock_rx_done
- virtio_vsock_probe
- virtio_vsock_remove
- virtio_vsock_init
- virtio_vsock_exit
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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);
27
28 struct virtio_vsock {
29 struct virtio_device *vdev;
30 struct virtqueue *vqs[VSOCK_VQ_MAX];
31
32
33 struct work_struct tx_work;
34 struct work_struct rx_work;
35 struct work_struct event_work;
36
37
38
39
40 struct mutex tx_lock;
41 bool tx_run;
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;
49 struct list_head loopback_list;
50
51 atomic_t queued_replies;
52
53
54
55
56 struct mutex rx_lock;
57 bool rx_run;
58 int rx_buf_nr;
59 int rx_buf_max_nr;
60
61
62
63
64 struct mutex event_lock;
65 bool event_run;
66 struct virtio_vsock_event event_list[8];
67
68 u32 guest_cid;
69 };
70
71 static u32 virtio_transport_get_local_cid(void)
72 {
73 struct virtio_vsock *vsock;
74 u32 ret;
75
76 rcu_read_lock();
77 vsock = rcu_dereference(the_virtio_vsock);
78 if (!vsock) {
79 ret = VMADDR_CID_ANY;
80 goto out_rcu;
81 }
82
83 ret = vsock->guest_cid;
84 out_rcu:
85 rcu_read_unlock();
86 return ret;
87 }
88
89 static void virtio_transport_loopback_work(struct work_struct *work)
90 {
91 struct virtio_vsock *vsock =
92 container_of(work, struct virtio_vsock, loopback_work);
93 LIST_HEAD(pkts);
94
95 spin_lock_bh(&vsock->loopback_list_lock);
96 list_splice_init(&vsock->loopback_list, &pkts);
97 spin_unlock_bh(&vsock->loopback_list_lock);
98
99 mutex_lock(&vsock->rx_lock);
100
101 if (!vsock->rx_run)
102 goto out;
103
104 while (!list_empty(&pkts)) {
105 struct virtio_vsock_pkt *pkt;
106
107 pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list);
108 list_del_init(&pkt->list);
109
110 virtio_transport_recv_pkt(pkt);
111 }
112 out:
113 mutex_unlock(&vsock->rx_lock);
114 }
115
116 static int virtio_transport_send_pkt_loopback(struct virtio_vsock *vsock,
117 struct virtio_vsock_pkt *pkt)
118 {
119 int len = pkt->len;
120
121 spin_lock_bh(&vsock->loopback_list_lock);
122 list_add_tail(&pkt->list, &vsock->loopback_list);
123 spin_unlock_bh(&vsock->loopback_list_lock);
124
125 queue_work(virtio_vsock_workqueue, &vsock->loopback_work);
126
127 return len;
128 }
129
130 static void
131 virtio_transport_send_pkt_work(struct work_struct *work)
132 {
133 struct virtio_vsock *vsock =
134 container_of(work, struct virtio_vsock, send_pkt_work);
135 struct virtqueue *vq;
136 bool added = false;
137 bool restart_rx = false;
138
139 mutex_lock(&vsock->tx_lock);
140
141 if (!vsock->tx_run)
142 goto out;
143
144 vq = vsock->vqs[VSOCK_VQ_TX];
145
146 for (;;) {
147 struct virtio_vsock_pkt *pkt;
148 struct scatterlist hdr, buf, *sgs[2];
149 int ret, in_sg = 0, out_sg = 0;
150 bool reply;
151
152 spin_lock_bh(&vsock->send_pkt_list_lock);
153 if (list_empty(&vsock->send_pkt_list)) {
154 spin_unlock_bh(&vsock->send_pkt_list_lock);
155 break;
156 }
157
158 pkt = list_first_entry(&vsock->send_pkt_list,
159 struct virtio_vsock_pkt, list);
160 list_del_init(&pkt->list);
161 spin_unlock_bh(&vsock->send_pkt_list_lock);
162
163 virtio_transport_deliver_tap_pkt(pkt);
164
165 reply = pkt->reply;
166
167 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
168 sgs[out_sg++] = &hdr;
169 if (pkt->buf) {
170 sg_init_one(&buf, pkt->buf, pkt->len);
171 sgs[out_sg++] = &buf;
172 }
173
174 ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL);
175
176
177
178 if (ret < 0) {
179 spin_lock_bh(&vsock->send_pkt_list_lock);
180 list_add(&pkt->list, &vsock->send_pkt_list);
181 spin_unlock_bh(&vsock->send_pkt_list_lock);
182 break;
183 }
184
185 if (reply) {
186 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
187 int val;
188
189 val = atomic_dec_return(&vsock->queued_replies);
190
191
192 if (val + 1 == virtqueue_get_vring_size(rx_vq))
193 restart_rx = true;
194 }
195
196 added = true;
197 }
198
199 if (added)
200 virtqueue_kick(vq);
201
202 out:
203 mutex_unlock(&vsock->tx_lock);
204
205 if (restart_rx)
206 queue_work(virtio_vsock_workqueue, &vsock->rx_work);
207 }
208
209 static int
210 virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt)
211 {
212 struct virtio_vsock *vsock;
213 int len = pkt->len;
214
215 rcu_read_lock();
216 vsock = rcu_dereference(the_virtio_vsock);
217 if (!vsock) {
218 virtio_transport_free_pkt(pkt);
219 len = -ENODEV;
220 goto out_rcu;
221 }
222
223 if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) {
224 len = virtio_transport_send_pkt_loopback(vsock, pkt);
225 goto out_rcu;
226 }
227
228 if (pkt->reply)
229 atomic_inc(&vsock->queued_replies);
230
231 spin_lock_bh(&vsock->send_pkt_list_lock);
232 list_add_tail(&pkt->list, &vsock->send_pkt_list);
233 spin_unlock_bh(&vsock->send_pkt_list_lock);
234
235 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
236
237 out_rcu:
238 rcu_read_unlock();
239 return len;
240 }
241
242 static int
243 virtio_transport_cancel_pkt(struct vsock_sock *vsk)
244 {
245 struct virtio_vsock *vsock;
246 struct virtio_vsock_pkt *pkt, *n;
247 int cnt = 0, ret;
248 LIST_HEAD(freeme);
249
250 rcu_read_lock();
251 vsock = rcu_dereference(the_virtio_vsock);
252 if (!vsock) {
253 ret = -ENODEV;
254 goto out_rcu;
255 }
256
257 spin_lock_bh(&vsock->send_pkt_list_lock);
258 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) {
259 if (pkt->vsk != vsk)
260 continue;
261 list_move(&pkt->list, &freeme);
262 }
263 spin_unlock_bh(&vsock->send_pkt_list_lock);
264
265 list_for_each_entry_safe(pkt, n, &freeme, list) {
266 if (pkt->reply)
267 cnt++;
268 list_del(&pkt->list);
269 virtio_transport_free_pkt(pkt);
270 }
271
272 if (cnt) {
273 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
274 int new_cnt;
275
276 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies);
277 if (new_cnt + cnt >= virtqueue_get_vring_size(rx_vq) &&
278 new_cnt < virtqueue_get_vring_size(rx_vq))
279 queue_work(virtio_vsock_workqueue, &vsock->rx_work);
280 }
281
282 ret = 0;
283
284 out_rcu:
285 rcu_read_unlock();
286 return ret;
287 }
288
289 static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
290 {
291 int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
292 struct virtio_vsock_pkt *pkt;
293 struct scatterlist hdr, buf, *sgs[2];
294 struct virtqueue *vq;
295 int ret;
296
297 vq = vsock->vqs[VSOCK_VQ_RX];
298
299 do {
300 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
301 if (!pkt)
302 break;
303
304 pkt->buf = kmalloc(buf_len, GFP_KERNEL);
305 if (!pkt->buf) {
306 virtio_transport_free_pkt(pkt);
307 break;
308 }
309
310 pkt->buf_len = buf_len;
311 pkt->len = buf_len;
312
313 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
314 sgs[0] = &hdr;
315
316 sg_init_one(&buf, pkt->buf, buf_len);
317 sgs[1] = &buf;
318 ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL);
319 if (ret) {
320 virtio_transport_free_pkt(pkt);
321 break;
322 }
323 vsock->rx_buf_nr++;
324 } while (vq->num_free);
325 if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
326 vsock->rx_buf_max_nr = vsock->rx_buf_nr;
327 virtqueue_kick(vq);
328 }
329
330 static void virtio_transport_tx_work(struct work_struct *work)
331 {
332 struct virtio_vsock *vsock =
333 container_of(work, struct virtio_vsock, tx_work);
334 struct virtqueue *vq;
335 bool added = false;
336
337 vq = vsock->vqs[VSOCK_VQ_TX];
338 mutex_lock(&vsock->tx_lock);
339
340 if (!vsock->tx_run)
341 goto out;
342
343 do {
344 struct virtio_vsock_pkt *pkt;
345 unsigned int len;
346
347 virtqueue_disable_cb(vq);
348 while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
349 virtio_transport_free_pkt(pkt);
350 added = true;
351 }
352 } while (!virtqueue_enable_cb(vq));
353
354 out:
355 mutex_unlock(&vsock->tx_lock);
356
357 if (added)
358 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
359 }
360
361
362 static bool virtio_transport_more_replies(struct virtio_vsock *vsock)
363 {
364 struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX];
365 int val;
366
367 smp_rmb();
368 val = atomic_read(&vsock->queued_replies);
369
370 return val < virtqueue_get_vring_size(vq);
371 }
372
373 static void virtio_transport_rx_work(struct work_struct *work)
374 {
375 struct virtio_vsock *vsock =
376 container_of(work, struct virtio_vsock, rx_work);
377 struct virtqueue *vq;
378
379 vq = vsock->vqs[VSOCK_VQ_RX];
380
381 mutex_lock(&vsock->rx_lock);
382
383 if (!vsock->rx_run)
384 goto out;
385
386 do {
387 virtqueue_disable_cb(vq);
388 for (;;) {
389 struct virtio_vsock_pkt *pkt;
390 unsigned int len;
391
392 if (!virtio_transport_more_replies(vsock)) {
393
394
395
396
397 goto out;
398 }
399
400 pkt = virtqueue_get_buf(vq, &len);
401 if (!pkt) {
402 break;
403 }
404
405 vsock->rx_buf_nr--;
406
407
408 if (unlikely(len < sizeof(pkt->hdr) ||
409 len > sizeof(pkt->hdr) + pkt->len)) {
410 virtio_transport_free_pkt(pkt);
411 continue;
412 }
413
414 pkt->len = len - sizeof(pkt->hdr);
415 virtio_transport_deliver_tap_pkt(pkt);
416 virtio_transport_recv_pkt(pkt);
417 }
418 } while (!virtqueue_enable_cb(vq));
419
420 out:
421 if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
422 virtio_vsock_rx_fill(vsock);
423 mutex_unlock(&vsock->rx_lock);
424 }
425
426
427 static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock,
428 struct virtio_vsock_event *event)
429 {
430 struct scatterlist sg;
431 struct virtqueue *vq;
432
433 vq = vsock->vqs[VSOCK_VQ_EVENT];
434
435 sg_init_one(&sg, event, sizeof(*event));
436
437 return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL);
438 }
439
440
441 static void virtio_vsock_event_fill(struct virtio_vsock *vsock)
442 {
443 size_t i;
444
445 for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) {
446 struct virtio_vsock_event *event = &vsock->event_list[i];
447
448 virtio_vsock_event_fill_one(vsock, event);
449 }
450
451 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
452 }
453
454 static void virtio_vsock_reset_sock(struct sock *sk)
455 {
456 lock_sock(sk);
457 sk->sk_state = TCP_CLOSE;
458 sk->sk_err = ECONNRESET;
459 sk->sk_error_report(sk);
460 release_sock(sk);
461 }
462
463 static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock)
464 {
465 struct virtio_device *vdev = vsock->vdev;
466 __le64 guest_cid;
467
468 vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
469 &guest_cid, sizeof(guest_cid));
470 vsock->guest_cid = le64_to_cpu(guest_cid);
471 }
472
473
474 static void virtio_vsock_event_handle(struct virtio_vsock *vsock,
475 struct virtio_vsock_event *event)
476 {
477 switch (le32_to_cpu(event->id)) {
478 case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET:
479 virtio_vsock_update_guest_cid(vsock);
480 vsock_for_each_connected_socket(virtio_vsock_reset_sock);
481 break;
482 }
483 }
484
485 static void virtio_transport_event_work(struct work_struct *work)
486 {
487 struct virtio_vsock *vsock =
488 container_of(work, struct virtio_vsock, event_work);
489 struct virtqueue *vq;
490
491 vq = vsock->vqs[VSOCK_VQ_EVENT];
492
493 mutex_lock(&vsock->event_lock);
494
495 if (!vsock->event_run)
496 goto out;
497
498 do {
499 struct virtio_vsock_event *event;
500 unsigned int len;
501
502 virtqueue_disable_cb(vq);
503 while ((event = virtqueue_get_buf(vq, &len)) != NULL) {
504 if (len == sizeof(*event))
505 virtio_vsock_event_handle(vsock, event);
506
507 virtio_vsock_event_fill_one(vsock, event);
508 }
509 } while (!virtqueue_enable_cb(vq));
510
511 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
512 out:
513 mutex_unlock(&vsock->event_lock);
514 }
515
516 static void virtio_vsock_event_done(struct virtqueue *vq)
517 {
518 struct virtio_vsock *vsock = vq->vdev->priv;
519
520 if (!vsock)
521 return;
522 queue_work(virtio_vsock_workqueue, &vsock->event_work);
523 }
524
525 static void virtio_vsock_tx_done(struct virtqueue *vq)
526 {
527 struct virtio_vsock *vsock = vq->vdev->priv;
528
529 if (!vsock)
530 return;
531 queue_work(virtio_vsock_workqueue, &vsock->tx_work);
532 }
533
534 static void virtio_vsock_rx_done(struct virtqueue *vq)
535 {
536 struct virtio_vsock *vsock = vq->vdev->priv;
537
538 if (!vsock)
539 return;
540 queue_work(virtio_vsock_workqueue, &vsock->rx_work);
541 }
542
543 static struct virtio_transport virtio_transport = {
544 .transport = {
545 .get_local_cid = virtio_transport_get_local_cid,
546
547 .init = virtio_transport_do_socket_init,
548 .destruct = virtio_transport_destruct,
549 .release = virtio_transport_release,
550 .connect = virtio_transport_connect,
551 .shutdown = virtio_transport_shutdown,
552 .cancel_pkt = virtio_transport_cancel_pkt,
553
554 .dgram_bind = virtio_transport_dgram_bind,
555 .dgram_dequeue = virtio_transport_dgram_dequeue,
556 .dgram_enqueue = virtio_transport_dgram_enqueue,
557 .dgram_allow = virtio_transport_dgram_allow,
558
559 .stream_dequeue = virtio_transport_stream_dequeue,
560 .stream_enqueue = virtio_transport_stream_enqueue,
561 .stream_has_data = virtio_transport_stream_has_data,
562 .stream_has_space = virtio_transport_stream_has_space,
563 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
564 .stream_is_active = virtio_transport_stream_is_active,
565 .stream_allow = virtio_transport_stream_allow,
566
567 .notify_poll_in = virtio_transport_notify_poll_in,
568 .notify_poll_out = virtio_transport_notify_poll_out,
569 .notify_recv_init = virtio_transport_notify_recv_init,
570 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
571 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
572 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
573 .notify_send_init = virtio_transport_notify_send_init,
574 .notify_send_pre_block = virtio_transport_notify_send_pre_block,
575 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
576 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
577
578 .set_buffer_size = virtio_transport_set_buffer_size,
579 .set_min_buffer_size = virtio_transport_set_min_buffer_size,
580 .set_max_buffer_size = virtio_transport_set_max_buffer_size,
581 .get_buffer_size = virtio_transport_get_buffer_size,
582 .get_min_buffer_size = virtio_transport_get_min_buffer_size,
583 .get_max_buffer_size = virtio_transport_get_max_buffer_size,
584 },
585
586 .send_pkt = virtio_transport_send_pkt,
587 };
588
589 static int virtio_vsock_probe(struct virtio_device *vdev)
590 {
591 vq_callback_t *callbacks[] = {
592 virtio_vsock_rx_done,
593 virtio_vsock_tx_done,
594 virtio_vsock_event_done,
595 };
596 static const char * const names[] = {
597 "rx",
598 "tx",
599 "event",
600 };
601 struct virtio_vsock *vsock = NULL;
602 int ret;
603
604 ret = mutex_lock_interruptible(&the_virtio_vsock_mutex);
605 if (ret)
606 return ret;
607
608
609 if (rcu_dereference_protected(the_virtio_vsock,
610 lockdep_is_held(&the_virtio_vsock_mutex))) {
611 ret = -EBUSY;
612 goto out;
613 }
614
615 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
616 if (!vsock) {
617 ret = -ENOMEM;
618 goto out;
619 }
620
621 vsock->vdev = vdev;
622
623 ret = virtio_find_vqs(vsock->vdev, VSOCK_VQ_MAX,
624 vsock->vqs, callbacks, names,
625 NULL);
626 if (ret < 0)
627 goto out;
628
629 virtio_vsock_update_guest_cid(vsock);
630
631 vsock->rx_buf_nr = 0;
632 vsock->rx_buf_max_nr = 0;
633 atomic_set(&vsock->queued_replies, 0);
634
635 mutex_init(&vsock->tx_lock);
636 mutex_init(&vsock->rx_lock);
637 mutex_init(&vsock->event_lock);
638 spin_lock_init(&vsock->send_pkt_list_lock);
639 INIT_LIST_HEAD(&vsock->send_pkt_list);
640 spin_lock_init(&vsock->loopback_list_lock);
641 INIT_LIST_HEAD(&vsock->loopback_list);
642 INIT_WORK(&vsock->rx_work, virtio_transport_rx_work);
643 INIT_WORK(&vsock->tx_work, virtio_transport_tx_work);
644 INIT_WORK(&vsock->event_work, virtio_transport_event_work);
645 INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work);
646 INIT_WORK(&vsock->loopback_work, virtio_transport_loopback_work);
647
648 mutex_lock(&vsock->tx_lock);
649 vsock->tx_run = true;
650 mutex_unlock(&vsock->tx_lock);
651
652 mutex_lock(&vsock->rx_lock);
653 virtio_vsock_rx_fill(vsock);
654 vsock->rx_run = true;
655 mutex_unlock(&vsock->rx_lock);
656
657 mutex_lock(&vsock->event_lock);
658 virtio_vsock_event_fill(vsock);
659 vsock->event_run = true;
660 mutex_unlock(&vsock->event_lock);
661
662 vdev->priv = vsock;
663 rcu_assign_pointer(the_virtio_vsock, vsock);
664
665 mutex_unlock(&the_virtio_vsock_mutex);
666 return 0;
667
668 out:
669 kfree(vsock);
670 mutex_unlock(&the_virtio_vsock_mutex);
671 return ret;
672 }
673
674 static void virtio_vsock_remove(struct virtio_device *vdev)
675 {
676 struct virtio_vsock *vsock = vdev->priv;
677 struct virtio_vsock_pkt *pkt;
678
679 mutex_lock(&the_virtio_vsock_mutex);
680
681 vdev->priv = NULL;
682 rcu_assign_pointer(the_virtio_vsock, NULL);
683 synchronize_rcu();
684
685
686 vsock_for_each_connected_socket(virtio_vsock_reset_sock);
687
688
689
690
691 mutex_lock(&vsock->rx_lock);
692 vsock->rx_run = false;
693 mutex_unlock(&vsock->rx_lock);
694
695 mutex_lock(&vsock->tx_lock);
696 vsock->tx_run = false;
697 mutex_unlock(&vsock->tx_lock);
698
699 mutex_lock(&vsock->event_lock);
700 vsock->event_run = false;
701 mutex_unlock(&vsock->event_lock);
702
703
704
705
706 vdev->config->reset(vdev);
707
708 mutex_lock(&vsock->rx_lock);
709 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX])))
710 virtio_transport_free_pkt(pkt);
711 mutex_unlock(&vsock->rx_lock);
712
713 mutex_lock(&vsock->tx_lock);
714 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX])))
715 virtio_transport_free_pkt(pkt);
716 mutex_unlock(&vsock->tx_lock);
717
718 spin_lock_bh(&vsock->send_pkt_list_lock);
719 while (!list_empty(&vsock->send_pkt_list)) {
720 pkt = list_first_entry(&vsock->send_pkt_list,
721 struct virtio_vsock_pkt, list);
722 list_del(&pkt->list);
723 virtio_transport_free_pkt(pkt);
724 }
725 spin_unlock_bh(&vsock->send_pkt_list_lock);
726
727 spin_lock_bh(&vsock->loopback_list_lock);
728 while (!list_empty(&vsock->loopback_list)) {
729 pkt = list_first_entry(&vsock->loopback_list,
730 struct virtio_vsock_pkt, list);
731 list_del(&pkt->list);
732 virtio_transport_free_pkt(pkt);
733 }
734 spin_unlock_bh(&vsock->loopback_list_lock);
735
736
737 vdev->config->del_vqs(vdev);
738
739
740
741
742 flush_work(&vsock->loopback_work);
743 flush_work(&vsock->rx_work);
744 flush_work(&vsock->tx_work);
745 flush_work(&vsock->event_work);
746 flush_work(&vsock->send_pkt_work);
747
748 mutex_unlock(&the_virtio_vsock_mutex);
749
750 kfree(vsock);
751 }
752
753 static struct virtio_device_id id_table[] = {
754 { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },
755 { 0 },
756 };
757
758 static unsigned int features[] = {
759 };
760
761 static struct virtio_driver virtio_vsock_driver = {
762 .feature_table = features,
763 .feature_table_size = ARRAY_SIZE(features),
764 .driver.name = KBUILD_MODNAME,
765 .driver.owner = THIS_MODULE,
766 .id_table = id_table,
767 .probe = virtio_vsock_probe,
768 .remove = virtio_vsock_remove,
769 };
770
771 static int __init virtio_vsock_init(void)
772 {
773 int ret;
774
775 virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
776 if (!virtio_vsock_workqueue)
777 return -ENOMEM;
778
779 ret = vsock_core_init(&virtio_transport.transport);
780 if (ret)
781 goto out_wq;
782
783 ret = register_virtio_driver(&virtio_vsock_driver);
784 if (ret)
785 goto out_vci;
786
787 return 0;
788
789 out_vci:
790 vsock_core_exit();
791 out_wq:
792 destroy_workqueue(virtio_vsock_workqueue);
793 return ret;
794 }
795
796 static void __exit virtio_vsock_exit(void)
797 {
798 unregister_virtio_driver(&virtio_vsock_driver);
799 vsock_core_exit();
800 destroy_workqueue(virtio_vsock_workqueue);
801 }
802
803 module_init(virtio_vsock_init);
804 module_exit(virtio_vsock_exit);
805 MODULE_LICENSE("GPL v2");
806 MODULE_AUTHOR("Asias He");
807 MODULE_DESCRIPTION("virtio transport for vsock");
808 MODULE_DEVICE_TABLE(virtio, id_table);