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0ea9e1d3 AH |
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 | atomic_t queued_replies; | |
48 | ||
49 | /* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX] | |
50 | * must be accessed with rx_lock held. | |
51 | */ | |
52 | struct mutex rx_lock; | |
53 | int rx_buf_nr; | |
54 | int rx_buf_max_nr; | |
55 | ||
56 | /* The following fields are protected by event_lock. | |
57 | * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. | |
58 | */ | |
59 | struct mutex event_lock; | |
60 | struct virtio_vsock_event event_list[8]; | |
61 | ||
62 | u32 guest_cid; | |
63 | }; | |
64 | ||
65 | static struct virtio_vsock *virtio_vsock_get(void) | |
66 | { | |
67 | return the_virtio_vsock; | |
68 | } | |
69 | ||
70 | static u32 virtio_transport_get_local_cid(void) | |
71 | { | |
72 | struct virtio_vsock *vsock = virtio_vsock_get(); | |
73 | ||
74 | return vsock->guest_cid; | |
75 | } | |
76 | ||
77 | static void | |
78 | virtio_transport_send_pkt_work(struct work_struct *work) | |
79 | { | |
80 | struct virtio_vsock *vsock = | |
81 | container_of(work, struct virtio_vsock, send_pkt_work); | |
82 | struct virtqueue *vq; | |
83 | bool added = false; | |
84 | bool restart_rx = false; | |
85 | ||
86 | mutex_lock(&vsock->tx_lock); | |
87 | ||
88 | vq = vsock->vqs[VSOCK_VQ_TX]; | |
89 | ||
0ea9e1d3 AH |
90 | for (;;) { |
91 | struct virtio_vsock_pkt *pkt; | |
92 | struct scatterlist hdr, buf, *sgs[2]; | |
93 | int ret, in_sg = 0, out_sg = 0; | |
94 | bool reply; | |
95 | ||
96 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
97 | if (list_empty(&vsock->send_pkt_list)) { | |
98 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
0ea9e1d3 AH |
99 | break; |
100 | } | |
101 | ||
102 | pkt = list_first_entry(&vsock->send_pkt_list, | |
103 | struct virtio_vsock_pkt, list); | |
104 | list_del_init(&pkt->list); | |
105 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
106 | ||
107 | reply = pkt->reply; | |
108 | ||
109 | sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); | |
110 | sgs[out_sg++] = &hdr; | |
111 | if (pkt->buf) { | |
112 | sg_init_one(&buf, pkt->buf, pkt->len); | |
113 | sgs[out_sg++] = &buf; | |
114 | } | |
115 | ||
116 | ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL); | |
21bc54fc GG |
117 | /* Usually this means that there is no more space available in |
118 | * the vq | |
119 | */ | |
0ea9e1d3 AH |
120 | if (ret < 0) { |
121 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
122 | list_add(&pkt->list, &vsock->send_pkt_list); | |
123 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
0ea9e1d3 AH |
124 | break; |
125 | } | |
126 | ||
127 | if (reply) { | |
128 | struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; | |
129 | int val; | |
130 | ||
131 | val = atomic_dec_return(&vsock->queued_replies); | |
132 | ||
133 | /* Do we now have resources to resume rx processing? */ | |
134 | if (val + 1 == virtqueue_get_vring_size(rx_vq)) | |
135 | restart_rx = true; | |
136 | } | |
137 | ||
138 | added = true; | |
139 | } | |
140 | ||
141 | if (added) | |
142 | virtqueue_kick(vq); | |
143 | ||
144 | mutex_unlock(&vsock->tx_lock); | |
145 | ||
146 | if (restart_rx) | |
147 | queue_work(virtio_vsock_workqueue, &vsock->rx_work); | |
148 | } | |
149 | ||
150 | static int | |
151 | virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) | |
152 | { | |
153 | struct virtio_vsock *vsock; | |
154 | int len = pkt->len; | |
155 | ||
156 | vsock = virtio_vsock_get(); | |
157 | if (!vsock) { | |
158 | virtio_transport_free_pkt(pkt); | |
159 | return -ENODEV; | |
160 | } | |
161 | ||
162 | if (pkt->reply) | |
163 | atomic_inc(&vsock->queued_replies); | |
164 | ||
165 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
166 | list_add_tail(&pkt->list, &vsock->send_pkt_list); | |
167 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
168 | ||
169 | queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); | |
170 | return len; | |
171 | } | |
172 | ||
173 | static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) | |
174 | { | |
175 | int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; | |
176 | struct virtio_vsock_pkt *pkt; | |
177 | struct scatterlist hdr, buf, *sgs[2]; | |
178 | struct virtqueue *vq; | |
179 | int ret; | |
180 | ||
181 | vq = vsock->vqs[VSOCK_VQ_RX]; | |
182 | ||
183 | do { | |
184 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
185 | if (!pkt) | |
186 | break; | |
187 | ||
188 | pkt->buf = kmalloc(buf_len, GFP_KERNEL); | |
189 | if (!pkt->buf) { | |
190 | virtio_transport_free_pkt(pkt); | |
191 | break; | |
192 | } | |
193 | ||
194 | pkt->len = buf_len; | |
195 | ||
196 | sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); | |
197 | sgs[0] = &hdr; | |
198 | ||
199 | sg_init_one(&buf, pkt->buf, buf_len); | |
200 | sgs[1] = &buf; | |
201 | ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL); | |
202 | if (ret) { | |
203 | virtio_transport_free_pkt(pkt); | |
204 | break; | |
205 | } | |
206 | vsock->rx_buf_nr++; | |
207 | } while (vq->num_free); | |
208 | if (vsock->rx_buf_nr > vsock->rx_buf_max_nr) | |
209 | vsock->rx_buf_max_nr = vsock->rx_buf_nr; | |
210 | virtqueue_kick(vq); | |
211 | } | |
212 | ||
213 | static void virtio_transport_tx_work(struct work_struct *work) | |
214 | { | |
215 | struct virtio_vsock *vsock = | |
216 | container_of(work, struct virtio_vsock, tx_work); | |
217 | struct virtqueue *vq; | |
218 | bool added = false; | |
219 | ||
220 | vq = vsock->vqs[VSOCK_VQ_TX]; | |
221 | mutex_lock(&vsock->tx_lock); | |
222 | do { | |
223 | struct virtio_vsock_pkt *pkt; | |
224 | unsigned int len; | |
225 | ||
226 | virtqueue_disable_cb(vq); | |
227 | while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) { | |
228 | virtio_transport_free_pkt(pkt); | |
229 | added = true; | |
230 | } | |
231 | } while (!virtqueue_enable_cb(vq)); | |
232 | mutex_unlock(&vsock->tx_lock); | |
233 | ||
234 | if (added) | |
235 | queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); | |
236 | } | |
237 | ||
238 | /* Is there space left for replies to rx packets? */ | |
239 | static bool virtio_transport_more_replies(struct virtio_vsock *vsock) | |
240 | { | |
241 | struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX]; | |
242 | int val; | |
243 | ||
244 | smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ | |
245 | val = atomic_read(&vsock->queued_replies); | |
246 | ||
247 | return val < virtqueue_get_vring_size(vq); | |
248 | } | |
249 | ||
250 | static void virtio_transport_rx_work(struct work_struct *work) | |
251 | { | |
252 | struct virtio_vsock *vsock = | |
253 | container_of(work, struct virtio_vsock, rx_work); | |
254 | struct virtqueue *vq; | |
255 | ||
256 | vq = vsock->vqs[VSOCK_VQ_RX]; | |
257 | ||
258 | mutex_lock(&vsock->rx_lock); | |
259 | ||
260 | do { | |
261 | virtqueue_disable_cb(vq); | |
262 | for (;;) { | |
263 | struct virtio_vsock_pkt *pkt; | |
264 | unsigned int len; | |
265 | ||
266 | if (!virtio_transport_more_replies(vsock)) { | |
267 | /* Stop rx until the device processes already | |
268 | * pending replies. Leave rx virtqueue | |
269 | * callbacks disabled. | |
270 | */ | |
271 | goto out; | |
272 | } | |
273 | ||
274 | pkt = virtqueue_get_buf(vq, &len); | |
275 | if (!pkt) { | |
276 | break; | |
277 | } | |
278 | ||
279 | vsock->rx_buf_nr--; | |
280 | ||
281 | /* Drop short/long packets */ | |
282 | if (unlikely(len < sizeof(pkt->hdr) || | |
283 | len > sizeof(pkt->hdr) + pkt->len)) { | |
284 | virtio_transport_free_pkt(pkt); | |
285 | continue; | |
286 | } | |
287 | ||
288 | pkt->len = len - sizeof(pkt->hdr); | |
289 | virtio_transport_recv_pkt(pkt); | |
290 | } | |
291 | } while (!virtqueue_enable_cb(vq)); | |
292 | ||
293 | out: | |
294 | if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) | |
295 | virtio_vsock_rx_fill(vsock); | |
296 | mutex_unlock(&vsock->rx_lock); | |
297 | } | |
298 | ||
299 | /* event_lock must be held */ | |
300 | static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock, | |
301 | struct virtio_vsock_event *event) | |
302 | { | |
303 | struct scatterlist sg; | |
304 | struct virtqueue *vq; | |
305 | ||
306 | vq = vsock->vqs[VSOCK_VQ_EVENT]; | |
307 | ||
308 | sg_init_one(&sg, event, sizeof(*event)); | |
309 | ||
310 | return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL); | |
311 | } | |
312 | ||
313 | /* event_lock must be held */ | |
314 | static void virtio_vsock_event_fill(struct virtio_vsock *vsock) | |
315 | { | |
316 | size_t i; | |
317 | ||
318 | for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) { | |
319 | struct virtio_vsock_event *event = &vsock->event_list[i]; | |
320 | ||
321 | virtio_vsock_event_fill_one(vsock, event); | |
322 | } | |
323 | ||
324 | virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); | |
325 | } | |
326 | ||
327 | static void virtio_vsock_reset_sock(struct sock *sk) | |
328 | { | |
329 | lock_sock(sk); | |
330 | sk->sk_state = SS_UNCONNECTED; | |
331 | sk->sk_err = ECONNRESET; | |
332 | sk->sk_error_report(sk); | |
333 | release_sock(sk); | |
334 | } | |
335 | ||
336 | static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock) | |
337 | { | |
338 | struct virtio_device *vdev = vsock->vdev; | |
339 | u64 guest_cid; | |
340 | ||
341 | vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid), | |
342 | &guest_cid, sizeof(guest_cid)); | |
343 | vsock->guest_cid = le64_to_cpu(guest_cid); | |
344 | } | |
345 | ||
346 | /* event_lock must be held */ | |
347 | static void virtio_vsock_event_handle(struct virtio_vsock *vsock, | |
348 | struct virtio_vsock_event *event) | |
349 | { | |
350 | switch (le32_to_cpu(event->id)) { | |
351 | case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET: | |
352 | virtio_vsock_update_guest_cid(vsock); | |
353 | vsock_for_each_connected_socket(virtio_vsock_reset_sock); | |
354 | break; | |
355 | } | |
356 | } | |
357 | ||
358 | static void virtio_transport_event_work(struct work_struct *work) | |
359 | { | |
360 | struct virtio_vsock *vsock = | |
361 | container_of(work, struct virtio_vsock, event_work); | |
362 | struct virtqueue *vq; | |
363 | ||
364 | vq = vsock->vqs[VSOCK_VQ_EVENT]; | |
365 | ||
366 | mutex_lock(&vsock->event_lock); | |
367 | ||
368 | do { | |
369 | struct virtio_vsock_event *event; | |
370 | unsigned int len; | |
371 | ||
372 | virtqueue_disable_cb(vq); | |
373 | while ((event = virtqueue_get_buf(vq, &len)) != NULL) { | |
374 | if (len == sizeof(*event)) | |
375 | virtio_vsock_event_handle(vsock, event); | |
376 | ||
377 | virtio_vsock_event_fill_one(vsock, event); | |
378 | } | |
379 | } while (!virtqueue_enable_cb(vq)); | |
380 | ||
381 | virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); | |
382 | ||
383 | mutex_unlock(&vsock->event_lock); | |
384 | } | |
385 | ||
386 | static void virtio_vsock_event_done(struct virtqueue *vq) | |
387 | { | |
388 | struct virtio_vsock *vsock = vq->vdev->priv; | |
389 | ||
390 | if (!vsock) | |
391 | return; | |
392 | queue_work(virtio_vsock_workqueue, &vsock->event_work); | |
393 | } | |
394 | ||
395 | static void virtio_vsock_tx_done(struct virtqueue *vq) | |
396 | { | |
397 | struct virtio_vsock *vsock = vq->vdev->priv; | |
398 | ||
399 | if (!vsock) | |
400 | return; | |
401 | queue_work(virtio_vsock_workqueue, &vsock->tx_work); | |
402 | } | |
403 | ||
404 | static void virtio_vsock_rx_done(struct virtqueue *vq) | |
405 | { | |
406 | struct virtio_vsock *vsock = vq->vdev->priv; | |
407 | ||
408 | if (!vsock) | |
409 | return; | |
410 | queue_work(virtio_vsock_workqueue, &vsock->rx_work); | |
411 | } | |
412 | ||
413 | static struct virtio_transport virtio_transport = { | |
414 | .transport = { | |
415 | .get_local_cid = virtio_transport_get_local_cid, | |
416 | ||
417 | .init = virtio_transport_do_socket_init, | |
418 | .destruct = virtio_transport_destruct, | |
419 | .release = virtio_transport_release, | |
420 | .connect = virtio_transport_connect, | |
421 | .shutdown = virtio_transport_shutdown, | |
422 | ||
423 | .dgram_bind = virtio_transport_dgram_bind, | |
424 | .dgram_dequeue = virtio_transport_dgram_dequeue, | |
425 | .dgram_enqueue = virtio_transport_dgram_enqueue, | |
426 | .dgram_allow = virtio_transport_dgram_allow, | |
427 | ||
428 | .stream_dequeue = virtio_transport_stream_dequeue, | |
429 | .stream_enqueue = virtio_transport_stream_enqueue, | |
430 | .stream_has_data = virtio_transport_stream_has_data, | |
431 | .stream_has_space = virtio_transport_stream_has_space, | |
432 | .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, | |
433 | .stream_is_active = virtio_transport_stream_is_active, | |
434 | .stream_allow = virtio_transport_stream_allow, | |
435 | ||
436 | .notify_poll_in = virtio_transport_notify_poll_in, | |
437 | .notify_poll_out = virtio_transport_notify_poll_out, | |
438 | .notify_recv_init = virtio_transport_notify_recv_init, | |
439 | .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, | |
440 | .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, | |
441 | .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, | |
442 | .notify_send_init = virtio_transport_notify_send_init, | |
443 | .notify_send_pre_block = virtio_transport_notify_send_pre_block, | |
444 | .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, | |
445 | .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, | |
446 | ||
447 | .set_buffer_size = virtio_transport_set_buffer_size, | |
448 | .set_min_buffer_size = virtio_transport_set_min_buffer_size, | |
449 | .set_max_buffer_size = virtio_transport_set_max_buffer_size, | |
450 | .get_buffer_size = virtio_transport_get_buffer_size, | |
451 | .get_min_buffer_size = virtio_transport_get_min_buffer_size, | |
452 | .get_max_buffer_size = virtio_transport_get_max_buffer_size, | |
453 | }, | |
454 | ||
455 | .send_pkt = virtio_transport_send_pkt, | |
456 | }; | |
457 | ||
458 | static int virtio_vsock_probe(struct virtio_device *vdev) | |
459 | { | |
460 | vq_callback_t *callbacks[] = { | |
461 | virtio_vsock_rx_done, | |
462 | virtio_vsock_tx_done, | |
463 | virtio_vsock_event_done, | |
464 | }; | |
465 | static const char * const names[] = { | |
466 | "rx", | |
467 | "tx", | |
468 | "event", | |
469 | }; | |
470 | struct virtio_vsock *vsock = NULL; | |
471 | int ret; | |
472 | ||
473 | ret = mutex_lock_interruptible(&the_virtio_vsock_mutex); | |
474 | if (ret) | |
475 | return ret; | |
476 | ||
477 | /* Only one virtio-vsock device per guest is supported */ | |
478 | if (the_virtio_vsock) { | |
479 | ret = -EBUSY; | |
480 | goto out; | |
481 | } | |
482 | ||
483 | vsock = kzalloc(sizeof(*vsock), GFP_KERNEL); | |
484 | if (!vsock) { | |
485 | ret = -ENOMEM; | |
486 | goto out; | |
487 | } | |
488 | ||
489 | vsock->vdev = vdev; | |
490 | ||
491 | ret = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX, | |
492 | vsock->vqs, callbacks, names); | |
493 | if (ret < 0) | |
494 | goto out; | |
495 | ||
496 | virtio_vsock_update_guest_cid(vsock); | |
497 | ||
498 | ret = vsock_core_init(&virtio_transport.transport); | |
499 | if (ret < 0) | |
500 | goto out_vqs; | |
501 | ||
502 | vsock->rx_buf_nr = 0; | |
503 | vsock->rx_buf_max_nr = 0; | |
504 | atomic_set(&vsock->queued_replies, 0); | |
505 | ||
506 | vdev->priv = vsock; | |
507 | the_virtio_vsock = vsock; | |
508 | mutex_init(&vsock->tx_lock); | |
509 | mutex_init(&vsock->rx_lock); | |
510 | mutex_init(&vsock->event_lock); | |
511 | spin_lock_init(&vsock->send_pkt_list_lock); | |
512 | INIT_LIST_HEAD(&vsock->send_pkt_list); | |
513 | INIT_WORK(&vsock->rx_work, virtio_transport_rx_work); | |
514 | INIT_WORK(&vsock->tx_work, virtio_transport_tx_work); | |
515 | INIT_WORK(&vsock->event_work, virtio_transport_event_work); | |
516 | INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work); | |
517 | ||
518 | mutex_lock(&vsock->rx_lock); | |
519 | virtio_vsock_rx_fill(vsock); | |
520 | mutex_unlock(&vsock->rx_lock); | |
521 | ||
522 | mutex_lock(&vsock->event_lock); | |
523 | virtio_vsock_event_fill(vsock); | |
524 | mutex_unlock(&vsock->event_lock); | |
525 | ||
526 | mutex_unlock(&the_virtio_vsock_mutex); | |
527 | return 0; | |
528 | ||
529 | out_vqs: | |
530 | vsock->vdev->config->del_vqs(vsock->vdev); | |
531 | out: | |
532 | kfree(vsock); | |
533 | mutex_unlock(&the_virtio_vsock_mutex); | |
534 | return ret; | |
535 | } | |
536 | ||
537 | static void virtio_vsock_remove(struct virtio_device *vdev) | |
538 | { | |
539 | struct virtio_vsock *vsock = vdev->priv; | |
540 | struct virtio_vsock_pkt *pkt; | |
541 | ||
542 | flush_work(&vsock->rx_work); | |
543 | flush_work(&vsock->tx_work); | |
544 | flush_work(&vsock->event_work); | |
545 | flush_work(&vsock->send_pkt_work); | |
546 | ||
547 | vdev->config->reset(vdev); | |
548 | ||
549 | mutex_lock(&vsock->rx_lock); | |
550 | while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX]))) | |
551 | virtio_transport_free_pkt(pkt); | |
552 | mutex_unlock(&vsock->rx_lock); | |
553 | ||
554 | mutex_lock(&vsock->tx_lock); | |
555 | while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX]))) | |
556 | virtio_transport_free_pkt(pkt); | |
557 | mutex_unlock(&vsock->tx_lock); | |
558 | ||
559 | spin_lock_bh(&vsock->send_pkt_list_lock); | |
560 | while (!list_empty(&vsock->send_pkt_list)) { | |
561 | pkt = list_first_entry(&vsock->send_pkt_list, | |
562 | struct virtio_vsock_pkt, list); | |
563 | list_del(&pkt->list); | |
564 | virtio_transport_free_pkt(pkt); | |
565 | } | |
566 | spin_unlock_bh(&vsock->send_pkt_list_lock); | |
567 | ||
568 | mutex_lock(&the_virtio_vsock_mutex); | |
569 | the_virtio_vsock = NULL; | |
570 | vsock_core_exit(); | |
571 | mutex_unlock(&the_virtio_vsock_mutex); | |
572 | ||
573 | vdev->config->del_vqs(vdev); | |
574 | ||
575 | kfree(vsock); | |
576 | } | |
577 | ||
578 | static struct virtio_device_id id_table[] = { | |
579 | { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID }, | |
580 | { 0 }, | |
581 | }; | |
582 | ||
583 | static unsigned int features[] = { | |
584 | }; | |
585 | ||
586 | static struct virtio_driver virtio_vsock_driver = { | |
587 | .feature_table = features, | |
588 | .feature_table_size = ARRAY_SIZE(features), | |
589 | .driver.name = KBUILD_MODNAME, | |
590 | .driver.owner = THIS_MODULE, | |
591 | .id_table = id_table, | |
592 | .probe = virtio_vsock_probe, | |
593 | .remove = virtio_vsock_remove, | |
594 | }; | |
595 | ||
596 | static int __init virtio_vsock_init(void) | |
597 | { | |
598 | int ret; | |
599 | ||
600 | virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0); | |
601 | if (!virtio_vsock_workqueue) | |
602 | return -ENOMEM; | |
603 | ret = register_virtio_driver(&virtio_vsock_driver); | |
604 | if (ret) | |
605 | destroy_workqueue(virtio_vsock_workqueue); | |
606 | return ret; | |
607 | } | |
608 | ||
609 | static void __exit virtio_vsock_exit(void) | |
610 | { | |
611 | unregister_virtio_driver(&virtio_vsock_driver); | |
612 | destroy_workqueue(virtio_vsock_workqueue); | |
613 | } | |
614 | ||
615 | module_init(virtio_vsock_init); | |
616 | module_exit(virtio_vsock_exit); | |
617 | MODULE_LICENSE("GPL v2"); | |
618 | MODULE_AUTHOR("Asias He"); | |
619 | MODULE_DESCRIPTION("virtio transport for vsock"); | |
620 | MODULE_DEVICE_TABLE(virtio, id_table); |