blob: 0f41c9195e9bb9942adc2e6e15a43af4a34393e2 [file] [log] [blame]
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +00001/* Copyright (C) 2009 Red Hat, Inc.
2 * Author: Michael S. Tsirkin <mst@redhat.com>
3 *
4 * This work is licensed under the terms of the GNU GPL, version 2.
5 *
6 * virtio-net server in host kernel.
7 */
8
9#include <linux/compat.h>
10#include <linux/eventfd.h>
11#include <linux/vhost.h>
12#include <linux/virtio_net.h>
13#include <linux/mmu_context.h>
14#include <linux/miscdevice.h>
15#include <linux/module.h>
16#include <linux/mutex.h>
17#include <linux/workqueue.h>
18#include <linux/rcupdate.h>
19#include <linux/file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +000021
22#include <linux/net.h>
23#include <linux/if_packet.h>
24#include <linux/if_arp.h>
25#include <linux/if_tun.h>
Arnd Bergmann501c7742010-02-18 05:46:50 +000026#include <linux/if_macvlan.h>
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +000027
28#include <net/sock.h>
29
30#include "vhost.h"
31
32/* Max number of bytes transferred before requeueing the job.
33 * Using this limit prevents one virtqueue from starving others. */
34#define VHOST_NET_WEIGHT 0x80000
35
36enum {
37 VHOST_NET_VQ_RX = 0,
38 VHOST_NET_VQ_TX = 1,
39 VHOST_NET_VQ_MAX = 2,
40};
41
42enum vhost_net_poll_state {
43 VHOST_NET_POLL_DISABLED = 0,
44 VHOST_NET_POLL_STARTED = 1,
45 VHOST_NET_POLL_STOPPED = 2,
46};
47
48struct vhost_net {
49 struct vhost_dev dev;
50 struct vhost_virtqueue vqs[VHOST_NET_VQ_MAX];
51 struct vhost_poll poll[VHOST_NET_VQ_MAX];
52 /* Tells us whether we are polling a socket for TX.
53 * We only do this when socket buffer fills up.
54 * Protected by tx vq lock. */
55 enum vhost_net_poll_state tx_poll_state;
56};
57
58/* Pop first len bytes from iovec. Return number of segments used. */
59static int move_iovec_hdr(struct iovec *from, struct iovec *to,
60 size_t len, int iov_count)
61{
62 int seg = 0;
63 size_t size;
64 while (len && seg < iov_count) {
65 size = min(from->iov_len, len);
66 to->iov_base = from->iov_base;
67 to->iov_len = size;
68 from->iov_len -= size;
69 from->iov_base += size;
70 len -= size;
71 ++from;
72 ++to;
73 ++seg;
74 }
75 return seg;
76}
77
78/* Caller must have TX VQ lock */
79static void tx_poll_stop(struct vhost_net *net)
80{
81 if (likely(net->tx_poll_state != VHOST_NET_POLL_STARTED))
82 return;
83 vhost_poll_stop(net->poll + VHOST_NET_VQ_TX);
84 net->tx_poll_state = VHOST_NET_POLL_STOPPED;
85}
86
87/* Caller must have TX VQ lock */
88static void tx_poll_start(struct vhost_net *net, struct socket *sock)
89{
90 if (unlikely(net->tx_poll_state != VHOST_NET_POLL_STOPPED))
91 return;
92 vhost_poll_start(net->poll + VHOST_NET_VQ_TX, sock->file);
93 net->tx_poll_state = VHOST_NET_POLL_STARTED;
94}
95
96/* Expects to be always run from workqueue - which acts as
97 * read-size critical section for our kind of RCU. */
98static void handle_tx(struct vhost_net *net)
99{
100 struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX];
101 unsigned head, out, in, s;
102 struct msghdr msg = {
103 .msg_name = NULL,
104 .msg_namelen = 0,
105 .msg_control = NULL,
106 .msg_controllen = 0,
107 .msg_iov = vq->iov,
108 .msg_flags = MSG_DONTWAIT,
109 };
110 size_t len, total_len = 0;
111 int err, wmem;
112 size_t hdr_size;
113 struct socket *sock = rcu_dereference(vq->private_data);
114 if (!sock)
115 return;
116
117 wmem = atomic_read(&sock->sk->sk_wmem_alloc);
Sridhar Samudrala39286fa2010-02-28 19:39:16 +0200118 if (wmem >= sock->sk->sk_sndbuf) {
119 mutex_lock(&vq->mutex);
120 tx_poll_start(net, sock);
121 mutex_unlock(&vq->mutex);
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000122 return;
Sridhar Samudrala39286fa2010-02-28 19:39:16 +0200123 }
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000124
125 use_mm(net->dev.mm);
126 mutex_lock(&vq->mutex);
127 vhost_disable_notify(vq);
128
Michael S. Tsirkin0e255572010-03-08 23:24:22 +0200129 if (wmem < sock->sk->sk_sndbuf / 2)
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000130 tx_poll_stop(net);
131 hdr_size = vq->hdr_size;
132
133 for (;;) {
134 head = vhost_get_vq_desc(&net->dev, vq, vq->iov,
135 ARRAY_SIZE(vq->iov),
136 &out, &in,
137 NULL, NULL);
138 /* Nothing new? Wait for eventfd to tell us they refilled. */
139 if (head == vq->num) {
140 wmem = atomic_read(&sock->sk->sk_wmem_alloc);
141 if (wmem >= sock->sk->sk_sndbuf * 3 / 4) {
142 tx_poll_start(net, sock);
143 set_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
144 break;
145 }
146 if (unlikely(vhost_enable_notify(vq))) {
147 vhost_disable_notify(vq);
148 continue;
149 }
150 break;
151 }
152 if (in) {
153 vq_err(vq, "Unexpected descriptor format for TX: "
154 "out %d, int %d\n", out, in);
155 break;
156 }
157 /* Skip header. TODO: support TSO. */
158 s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out);
159 msg.msg_iovlen = out;
160 len = iov_length(vq->iov, out);
161 /* Sanity check */
162 if (!len) {
163 vq_err(vq, "Unexpected header len for TX: "
164 "%zd expected %zd\n",
165 iov_length(vq->hdr, s), hdr_size);
166 break;
167 }
168 /* TODO: Check specific error and bomb out unless ENOBUFS? */
169 err = sock->ops->sendmsg(NULL, sock, &msg, len);
170 if (unlikely(err < 0)) {
171 vhost_discard_vq_desc(vq);
172 tx_poll_start(net, sock);
173 break;
174 }
175 if (err != len)
176 pr_err("Truncated TX packet: "
177 " len %d != %zd\n", err, len);
178 vhost_add_used_and_signal(&net->dev, vq, head, 0);
179 total_len += len;
180 if (unlikely(total_len >= VHOST_NET_WEIGHT)) {
181 vhost_poll_queue(&vq->poll);
182 break;
183 }
184 }
185
186 mutex_unlock(&vq->mutex);
187 unuse_mm(net->dev.mm);
188}
189
190/* Expects to be always run from workqueue - which acts as
191 * read-size critical section for our kind of RCU. */
192static void handle_rx(struct vhost_net *net)
193{
194 struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX];
195 unsigned head, out, in, log, s;
196 struct vhost_log *vq_log;
197 struct msghdr msg = {
198 .msg_name = NULL,
199 .msg_namelen = 0,
200 .msg_control = NULL, /* FIXME: get and handle RX aux data. */
201 .msg_controllen = 0,
202 .msg_iov = vq->iov,
203 .msg_flags = MSG_DONTWAIT,
204 };
205
206 struct virtio_net_hdr hdr = {
207 .flags = 0,
208 .gso_type = VIRTIO_NET_HDR_GSO_NONE
209 };
210
211 size_t len, total_len = 0;
212 int err;
213 size_t hdr_size;
214 struct socket *sock = rcu_dereference(vq->private_data);
215 if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue))
216 return;
217
218 use_mm(net->dev.mm);
219 mutex_lock(&vq->mutex);
220 vhost_disable_notify(vq);
221 hdr_size = vq->hdr_size;
222
223 vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ?
224 vq->log : NULL;
225
226 for (;;) {
227 head = vhost_get_vq_desc(&net->dev, vq, vq->iov,
228 ARRAY_SIZE(vq->iov),
229 &out, &in,
230 vq_log, &log);
231 /* OK, now we need to know about added descriptors. */
232 if (head == vq->num) {
233 if (unlikely(vhost_enable_notify(vq))) {
234 /* They have slipped one in as we were
235 * doing that: check again. */
236 vhost_disable_notify(vq);
237 continue;
238 }
239 /* Nothing new? Wait for eventfd to tell us
240 * they refilled. */
241 break;
242 }
243 /* We don't need to be notified again. */
244 if (out) {
245 vq_err(vq, "Unexpected descriptor format for RX: "
246 "out %d, int %d\n",
247 out, in);
248 break;
249 }
250 /* Skip header. TODO: support TSO/mergeable rx buffers. */
251 s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, in);
252 msg.msg_iovlen = in;
253 len = iov_length(vq->iov, in);
254 /* Sanity check */
255 if (!len) {
256 vq_err(vq, "Unexpected header len for RX: "
257 "%zd expected %zd\n",
258 iov_length(vq->hdr, s), hdr_size);
259 break;
260 }
261 err = sock->ops->recvmsg(NULL, sock, &msg,
262 len, MSG_DONTWAIT | MSG_TRUNC);
263 /* TODO: Check specific error and bomb out unless EAGAIN? */
264 if (err < 0) {
265 vhost_discard_vq_desc(vq);
266 break;
267 }
268 /* TODO: Should check and handle checksum. */
269 if (err > len) {
270 pr_err("Discarded truncated rx packet: "
271 " len %d > %zd\n", err, len);
272 vhost_discard_vq_desc(vq);
273 continue;
274 }
275 len = err;
276 err = memcpy_toiovec(vq->hdr, (unsigned char *)&hdr, hdr_size);
277 if (err) {
278 vq_err(vq, "Unable to write vnet_hdr at addr %p: %d\n",
279 vq->iov->iov_base, err);
280 break;
281 }
282 len += hdr_size;
283 vhost_add_used_and_signal(&net->dev, vq, head, len);
284 if (unlikely(vq_log))
285 vhost_log_write(vq, vq_log, log, len);
286 total_len += len;
287 if (unlikely(total_len >= VHOST_NET_WEIGHT)) {
288 vhost_poll_queue(&vq->poll);
289 break;
290 }
291 }
292
293 mutex_unlock(&vq->mutex);
294 unuse_mm(net->dev.mm);
295}
296
297static void handle_tx_kick(struct work_struct *work)
298{
299 struct vhost_virtqueue *vq;
300 struct vhost_net *net;
301 vq = container_of(work, struct vhost_virtqueue, poll.work);
302 net = container_of(vq->dev, struct vhost_net, dev);
303 handle_tx(net);
304}
305
306static void handle_rx_kick(struct work_struct *work)
307{
308 struct vhost_virtqueue *vq;
309 struct vhost_net *net;
310 vq = container_of(work, struct vhost_virtqueue, poll.work);
311 net = container_of(vq->dev, struct vhost_net, dev);
312 handle_rx(net);
313}
314
315static void handle_tx_net(struct work_struct *work)
316{
317 struct vhost_net *net;
318 net = container_of(work, struct vhost_net, poll[VHOST_NET_VQ_TX].work);
319 handle_tx(net);
320}
321
322static void handle_rx_net(struct work_struct *work)
323{
324 struct vhost_net *net;
325 net = container_of(work, struct vhost_net, poll[VHOST_NET_VQ_RX].work);
326 handle_rx(net);
327}
328
329static int vhost_net_open(struct inode *inode, struct file *f)
330{
331 struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL);
332 int r;
333 if (!n)
334 return -ENOMEM;
335 n->vqs[VHOST_NET_VQ_TX].handle_kick = handle_tx_kick;
336 n->vqs[VHOST_NET_VQ_RX].handle_kick = handle_rx_kick;
337 r = vhost_dev_init(&n->dev, n->vqs, VHOST_NET_VQ_MAX);
338 if (r < 0) {
339 kfree(n);
340 return r;
341 }
342
343 vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT);
344 vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN);
345 n->tx_poll_state = VHOST_NET_POLL_DISABLED;
346
347 f->private_data = n;
348
349 return 0;
350}
351
352static void vhost_net_disable_vq(struct vhost_net *n,
353 struct vhost_virtqueue *vq)
354{
355 if (!vq->private_data)
356 return;
357 if (vq == n->vqs + VHOST_NET_VQ_TX) {
358 tx_poll_stop(n);
359 n->tx_poll_state = VHOST_NET_POLL_DISABLED;
360 } else
361 vhost_poll_stop(n->poll + VHOST_NET_VQ_RX);
362}
363
364static void vhost_net_enable_vq(struct vhost_net *n,
365 struct vhost_virtqueue *vq)
366{
367 struct socket *sock = vq->private_data;
368 if (!sock)
369 return;
370 if (vq == n->vqs + VHOST_NET_VQ_TX) {
371 n->tx_poll_state = VHOST_NET_POLL_STOPPED;
372 tx_poll_start(n, sock);
373 } else
374 vhost_poll_start(n->poll + VHOST_NET_VQ_RX, sock->file);
375}
376
377static struct socket *vhost_net_stop_vq(struct vhost_net *n,
378 struct vhost_virtqueue *vq)
379{
380 struct socket *sock;
381
382 mutex_lock(&vq->mutex);
383 sock = vq->private_data;
384 vhost_net_disable_vq(n, vq);
385 rcu_assign_pointer(vq->private_data, NULL);
386 mutex_unlock(&vq->mutex);
387 return sock;
388}
389
390static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock,
391 struct socket **rx_sock)
392{
393 *tx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_TX);
394 *rx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_RX);
395}
396
397static void vhost_net_flush_vq(struct vhost_net *n, int index)
398{
399 vhost_poll_flush(n->poll + index);
400 vhost_poll_flush(&n->dev.vqs[index].poll);
401}
402
403static void vhost_net_flush(struct vhost_net *n)
404{
405 vhost_net_flush_vq(n, VHOST_NET_VQ_TX);
406 vhost_net_flush_vq(n, VHOST_NET_VQ_RX);
407}
408
409static int vhost_net_release(struct inode *inode, struct file *f)
410{
411 struct vhost_net *n = f->private_data;
412 struct socket *tx_sock;
413 struct socket *rx_sock;
414
415 vhost_net_stop(n, &tx_sock, &rx_sock);
416 vhost_net_flush(n);
417 vhost_dev_cleanup(&n->dev);
418 if (tx_sock)
419 fput(tx_sock->file);
420 if (rx_sock)
421 fput(rx_sock->file);
422 /* We do an extra flush before freeing memory,
423 * since jobs can re-queue themselves. */
424 vhost_net_flush(n);
425 kfree(n);
426 return 0;
427}
428
429static struct socket *get_raw_socket(int fd)
430{
431 struct {
432 struct sockaddr_ll sa;
433 char buf[MAX_ADDR_LEN];
434 } uaddr;
435 int uaddr_len = sizeof uaddr, r;
436 struct socket *sock = sockfd_lookup(fd, &r);
437 if (!sock)
438 return ERR_PTR(-ENOTSOCK);
439
440 /* Parameter checking */
441 if (sock->sk->sk_type != SOCK_RAW) {
442 r = -ESOCKTNOSUPPORT;
443 goto err;
444 }
445
446 r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa,
447 &uaddr_len, 0);
448 if (r)
449 goto err;
450
451 if (uaddr.sa.sll_family != AF_PACKET) {
452 r = -EPFNOSUPPORT;
453 goto err;
454 }
455 return sock;
456err:
457 fput(sock->file);
458 return ERR_PTR(r);
459}
460
Arnd Bergmann501c7742010-02-18 05:46:50 +0000461static struct socket *get_tap_socket(int fd)
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000462{
463 struct file *file = fget(fd);
464 struct socket *sock;
465 if (!file)
466 return ERR_PTR(-EBADF);
467 sock = tun_get_socket(file);
Arnd Bergmann501c7742010-02-18 05:46:50 +0000468 if (!IS_ERR(sock))
469 return sock;
470 sock = macvtap_get_socket(file);
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000471 if (IS_ERR(sock))
472 fput(file);
473 return sock;
474}
475
476static struct socket *get_socket(int fd)
477{
478 struct socket *sock;
479 /* special case to disable backend */
480 if (fd == -1)
481 return NULL;
482 sock = get_raw_socket(fd);
483 if (!IS_ERR(sock))
484 return sock;
Arnd Bergmann501c7742010-02-18 05:46:50 +0000485 sock = get_tap_socket(fd);
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000486 if (!IS_ERR(sock))
487 return sock;
488 return ERR_PTR(-ENOTSOCK);
489}
490
491static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
492{
493 struct socket *sock, *oldsock;
494 struct vhost_virtqueue *vq;
495 int r;
496
497 mutex_lock(&n->dev.mutex);
498 r = vhost_dev_check_owner(&n->dev);
499 if (r)
500 goto err;
501
502 if (index >= VHOST_NET_VQ_MAX) {
503 r = -ENOBUFS;
504 goto err;
505 }
506 vq = n->vqs + index;
507 mutex_lock(&vq->mutex);
508
509 /* Verify that ring has been setup correctly. */
510 if (!vhost_vq_access_ok(vq)) {
511 r = -EFAULT;
Jeff Dike1dace8c2010-03-04 16:10:14 -0500512 goto err_vq;
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000513 }
514 sock = get_socket(fd);
515 if (IS_ERR(sock)) {
516 r = PTR_ERR(sock);
Jeff Dike1dace8c2010-03-04 16:10:14 -0500517 goto err_vq;
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000518 }
519
520 /* start polling new socket */
521 oldsock = vq->private_data;
522 if (sock == oldsock)
523 goto done;
524
525 vhost_net_disable_vq(n, vq);
526 rcu_assign_pointer(vq->private_data, sock);
527 vhost_net_enable_vq(n, vq);
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000528done:
529 if (oldsock) {
530 vhost_net_flush_vq(n, index);
531 fput(oldsock->file);
532 }
Jeff Dike1dace8c2010-03-04 16:10:14 -0500533
534err_vq:
535 mutex_unlock(&vq->mutex);
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000536err:
537 mutex_unlock(&n->dev.mutex);
538 return r;
539}
540
541static long vhost_net_reset_owner(struct vhost_net *n)
542{
543 struct socket *tx_sock = NULL;
544 struct socket *rx_sock = NULL;
545 long err;
546 mutex_lock(&n->dev.mutex);
547 err = vhost_dev_check_owner(&n->dev);
548 if (err)
549 goto done;
550 vhost_net_stop(n, &tx_sock, &rx_sock);
551 vhost_net_flush(n);
552 err = vhost_dev_reset_owner(&n->dev);
553done:
554 mutex_unlock(&n->dev.mutex);
555 if (tx_sock)
556 fput(tx_sock->file);
557 if (rx_sock)
558 fput(rx_sock->file);
559 return err;
560}
561
562static int vhost_net_set_features(struct vhost_net *n, u64 features)
563{
564 size_t hdr_size = features & (1 << VHOST_NET_F_VIRTIO_NET_HDR) ?
565 sizeof(struct virtio_net_hdr) : 0;
566 int i;
567 mutex_lock(&n->dev.mutex);
568 if ((features & (1 << VHOST_F_LOG_ALL)) &&
569 !vhost_log_access_ok(&n->dev)) {
570 mutex_unlock(&n->dev.mutex);
571 return -EFAULT;
572 }
573 n->dev.acked_features = features;
574 smp_wmb();
575 for (i = 0; i < VHOST_NET_VQ_MAX; ++i) {
576 mutex_lock(&n->vqs[i].mutex);
577 n->vqs[i].hdr_size = hdr_size;
578 mutex_unlock(&n->vqs[i].mutex);
579 }
580 vhost_net_flush(n);
581 mutex_unlock(&n->dev.mutex);
582 return 0;
583}
584
585static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
586 unsigned long arg)
587{
588 struct vhost_net *n = f->private_data;
589 void __user *argp = (void __user *)arg;
590 u64 __user *featurep = argp;
591 struct vhost_vring_file backend;
592 u64 features;
593 int r;
594 switch (ioctl) {
595 case VHOST_NET_SET_BACKEND:
Takuya Yoshikawad3553a52010-05-27 19:01:58 +0900596 if (copy_from_user(&backend, argp, sizeof backend))
597 return -EFAULT;
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000598 return vhost_net_set_backend(n, backend.index, backend.fd);
599 case VHOST_GET_FEATURES:
600 features = VHOST_FEATURES;
Takuya Yoshikawad3553a52010-05-27 19:01:58 +0900601 if (copy_to_user(featurep, &features, sizeof features))
602 return -EFAULT;
603 return 0;
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000604 case VHOST_SET_FEATURES:
Takuya Yoshikawad3553a52010-05-27 19:01:58 +0900605 if (copy_from_user(&features, featurep, sizeof features))
606 return -EFAULT;
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000607 if (features & ~VHOST_FEATURES)
608 return -EOPNOTSUPP;
609 return vhost_net_set_features(n, features);
610 case VHOST_RESET_OWNER:
611 return vhost_net_reset_owner(n);
612 default:
613 mutex_lock(&n->dev.mutex);
614 r = vhost_dev_ioctl(&n->dev, ioctl, arg);
615 vhost_net_flush(n);
616 mutex_unlock(&n->dev.mutex);
617 return r;
618 }
619}
620
621#ifdef CONFIG_COMPAT
622static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl,
623 unsigned long arg)
624{
625 return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
626}
627#endif
628
629const static struct file_operations vhost_net_fops = {
630 .owner = THIS_MODULE,
631 .release = vhost_net_release,
632 .unlocked_ioctl = vhost_net_ioctl,
633#ifdef CONFIG_COMPAT
634 .compat_ioctl = vhost_net_compat_ioctl,
635#endif
636 .open = vhost_net_open,
637};
638
639static struct miscdevice vhost_net_misc = {
640 VHOST_NET_MINOR,
641 "vhost-net",
642 &vhost_net_fops,
643};
644
Christoph Hellwiga8d37822010-04-13 14:11:25 -0400645static int vhost_net_init(void)
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000646{
647 int r = vhost_init();
648 if (r)
649 goto err_init;
650 r = misc_register(&vhost_net_misc);
651 if (r)
652 goto err_reg;
653 return 0;
654err_reg:
655 vhost_cleanup();
656err_init:
657 return r;
658
659}
660module_init(vhost_net_init);
661
Christoph Hellwiga8d37822010-04-13 14:11:25 -0400662static void vhost_net_exit(void)
Michael S. Tsirkin3a4d5c92010-01-14 06:17:27 +0000663{
664 misc_deregister(&vhost_net_misc);
665 vhost_cleanup();
666}
667module_exit(vhost_net_exit);
668
669MODULE_VERSION("0.0.1");
670MODULE_LICENSE("GPL v2");
671MODULE_AUTHOR("Michael S. Tsirkin");
672MODULE_DESCRIPTION("Host kernel accelerator for virtio net");