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TOMOYO Linux Cross Reference
Linux/net/vmw_vsock/virtio_transport.c

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  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 

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