netdevice: safe convert to netdev_priv() #part-3
[linux-2.6.git] / drivers / net / virtio_net.c
1 /* A simple network driver using virtio.
2  *
3  * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18  */
19 //#define DEBUG
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/ethtool.h>
23 #include <linux/module.h>
24 #include <linux/virtio.h>
25 #include <linux/virtio_net.h>
26 #include <linux/scatterlist.h>
27
28 static int napi_weight = 128;
29 module_param(napi_weight, int, 0444);
30
31 static int csum = 1, gso = 1;
32 module_param(csum, bool, 0444);
33 module_param(gso, bool, 0444);
34
35 /* FIXME: MTU in config. */
36 #define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN)
37
38 struct virtnet_info
39 {
40         struct virtio_device *vdev;
41         struct virtqueue *rvq, *svq;
42         struct net_device *dev;
43         struct napi_struct napi;
44
45         /* The skb we couldn't send because buffers were full. */
46         struct sk_buff *last_xmit_skb;
47
48         /* If we need to free in a timer, this is it. */
49         struct timer_list xmit_free_timer;
50
51         /* Number of input buffers, and max we've ever had. */
52         unsigned int num, max;
53
54         /* For cleaning up after transmission. */
55         struct tasklet_struct tasklet;
56         bool free_in_tasklet;
57
58         /* I like... big packets and I cannot lie! */
59         bool big_packets;
60
61         /* Receive & send queues. */
62         struct sk_buff_head recv;
63         struct sk_buff_head send;
64
65         /* Chain pages by the private ptr. */
66         struct page *pages;
67 };
68
69 static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb)
70 {
71         return (struct virtio_net_hdr *)skb->cb;
72 }
73
74 static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb)
75 {
76         sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr));
77 }
78
79 static void give_a_page(struct virtnet_info *vi, struct page *page)
80 {
81         page->private = (unsigned long)vi->pages;
82         vi->pages = page;
83 }
84
85 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
86 {
87         struct page *p = vi->pages;
88
89         if (p)
90                 vi->pages = (struct page *)p->private;
91         else
92                 p = alloc_page(gfp_mask);
93         return p;
94 }
95
96 static void skb_xmit_done(struct virtqueue *svq)
97 {
98         struct virtnet_info *vi = svq->vdev->priv;
99
100         /* Suppress further interrupts. */
101         svq->vq_ops->disable_cb(svq);
102
103         /* We were probably waiting for more output buffers. */
104         netif_wake_queue(vi->dev);
105
106         /* Make sure we re-xmit last_xmit_skb: if there are no more packets
107          * queued, start_xmit won't be called. */
108         tasklet_schedule(&vi->tasklet);
109 }
110
111 static void receive_skb(struct net_device *dev, struct sk_buff *skb,
112                         unsigned len)
113 {
114         struct virtio_net_hdr *hdr = skb_vnet_hdr(skb);
115         int err;
116
117         if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
118                 pr_debug("%s: short packet %i\n", dev->name, len);
119                 dev->stats.rx_length_errors++;
120                 goto drop;
121         }
122         len -= sizeof(struct virtio_net_hdr);
123
124         if (len <= MAX_PACKET_LEN) {
125                 unsigned int i;
126
127                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
128                         give_a_page(netdev_priv(dev),
129                                     skb_shinfo(skb)->frags[i].page);
130                 skb->data_len = 0;
131                 skb_shinfo(skb)->nr_frags = 0;
132         }
133
134         err = pskb_trim(skb, len);
135         if (err) {
136                 pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err);
137                 dev->stats.rx_dropped++;
138                 goto drop;
139         }
140         skb->truesize += skb->data_len;
141         dev->stats.rx_bytes += skb->len;
142         dev->stats.rx_packets++;
143
144         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
145                 pr_debug("Needs csum!\n");
146                 if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset))
147                         goto frame_err;
148         }
149
150         skb->protocol = eth_type_trans(skb, dev);
151         pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
152                  ntohs(skb->protocol), skb->len, skb->pkt_type);
153
154         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
155                 pr_debug("GSO!\n");
156                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
157                 case VIRTIO_NET_HDR_GSO_TCPV4:
158                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
159                         break;
160                 case VIRTIO_NET_HDR_GSO_UDP:
161                         skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
162                         break;
163                 case VIRTIO_NET_HDR_GSO_TCPV6:
164                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
165                         break;
166                 default:
167                         if (net_ratelimit())
168                                 printk(KERN_WARNING "%s: bad gso type %u.\n",
169                                        dev->name, hdr->gso_type);
170                         goto frame_err;
171                 }
172
173                 if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
174                         skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
175
176                 skb_shinfo(skb)->gso_size = hdr->gso_size;
177                 if (skb_shinfo(skb)->gso_size == 0) {
178                         if (net_ratelimit())
179                                 printk(KERN_WARNING "%s: zero gso size.\n",
180                                        dev->name);
181                         goto frame_err;
182                 }
183
184                 /* Header must be checked, and gso_segs computed. */
185                 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
186                 skb_shinfo(skb)->gso_segs = 0;
187         }
188
189         netif_receive_skb(skb);
190         return;
191
192 frame_err:
193         dev->stats.rx_frame_errors++;
194 drop:
195         dev_kfree_skb(skb);
196 }
197
198 static void try_fill_recv(struct virtnet_info *vi)
199 {
200         struct sk_buff *skb;
201         struct scatterlist sg[2+MAX_SKB_FRAGS];
202         int num, err, i;
203
204         sg_init_table(sg, 2+MAX_SKB_FRAGS);
205         for (;;) {
206                 skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN);
207                 if (unlikely(!skb))
208                         break;
209
210                 skb_put(skb, MAX_PACKET_LEN);
211                 vnet_hdr_to_sg(sg, skb);
212
213                 if (vi->big_packets) {
214                         for (i = 0; i < MAX_SKB_FRAGS; i++) {
215                                 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
216                                 f->page = get_a_page(vi, GFP_ATOMIC);
217                                 if (!f->page)
218                                         break;
219
220                                 f->page_offset = 0;
221                                 f->size = PAGE_SIZE;
222
223                                 skb->data_len += PAGE_SIZE;
224                                 skb->len += PAGE_SIZE;
225
226                                 skb_shinfo(skb)->nr_frags++;
227                         }
228                 }
229
230                 num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
231                 skb_queue_head(&vi->recv, skb);
232
233                 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
234                 if (err) {
235                         skb_unlink(skb, &vi->recv);
236                         kfree_skb(skb);
237                         break;
238                 }
239                 vi->num++;
240         }
241         if (unlikely(vi->num > vi->max))
242                 vi->max = vi->num;
243         vi->rvq->vq_ops->kick(vi->rvq);
244 }
245
246 static void skb_recv_done(struct virtqueue *rvq)
247 {
248         struct virtnet_info *vi = rvq->vdev->priv;
249         /* Schedule NAPI, Suppress further interrupts if successful. */
250         if (netif_rx_schedule_prep(vi->dev, &vi->napi)) {
251                 rvq->vq_ops->disable_cb(rvq);
252                 __netif_rx_schedule(vi->dev, &vi->napi);
253         }
254 }
255
256 static int virtnet_poll(struct napi_struct *napi, int budget)
257 {
258         struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
259         struct sk_buff *skb = NULL;
260         unsigned int len, received = 0;
261
262 again:
263         while (received < budget &&
264                (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
265                 __skb_unlink(skb, &vi->recv);
266                 receive_skb(vi->dev, skb, len);
267                 vi->num--;
268                 received++;
269         }
270
271         /* FIXME: If we oom and completely run out of inbufs, we need
272          * to start a timer trying to fill more. */
273         if (vi->num < vi->max / 2)
274                 try_fill_recv(vi);
275
276         /* Out of packets? */
277         if (received < budget) {
278                 netif_rx_complete(vi->dev, napi);
279                 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq))
280                     && napi_schedule_prep(napi)) {
281                         vi->rvq->vq_ops->disable_cb(vi->rvq);
282                         __netif_rx_schedule(vi->dev, napi);
283                         goto again;
284                 }
285         }
286
287         return received;
288 }
289
290 static void free_old_xmit_skbs(struct virtnet_info *vi)
291 {
292         struct sk_buff *skb;
293         unsigned int len;
294
295         while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
296                 pr_debug("Sent skb %p\n", skb);
297                 __skb_unlink(skb, &vi->send);
298                 vi->dev->stats.tx_bytes += skb->len;
299                 vi->dev->stats.tx_packets++;
300                 kfree_skb(skb);
301         }
302 }
303
304 /* If the virtio transport doesn't always notify us when all in-flight packets
305  * are consumed, we fall back to using this function on a timer to free them. */
306 static void xmit_free(unsigned long data)
307 {
308         struct virtnet_info *vi = (void *)data;
309
310         netif_tx_lock(vi->dev);
311
312         free_old_xmit_skbs(vi);
313
314         if (!skb_queue_empty(&vi->send))
315                 mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
316
317         netif_tx_unlock(vi->dev);
318 }
319
320 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
321 {
322         int num, err;
323         struct scatterlist sg[2+MAX_SKB_FRAGS];
324         struct virtio_net_hdr *hdr;
325         const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
326
327         sg_init_table(sg, 2+MAX_SKB_FRAGS);
328
329         pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
330
331         /* Encode metadata header at front. */
332         hdr = skb_vnet_hdr(skb);
333         if (skb->ip_summed == CHECKSUM_PARTIAL) {
334                 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
335                 hdr->csum_start = skb->csum_start - skb_headroom(skb);
336                 hdr->csum_offset = skb->csum_offset;
337         } else {
338                 hdr->flags = 0;
339                 hdr->csum_offset = hdr->csum_start = 0;
340         }
341
342         if (skb_is_gso(skb)) {
343                 hdr->hdr_len = skb_transport_header(skb) - skb->data;
344                 hdr->gso_size = skb_shinfo(skb)->gso_size;
345                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
346                         hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
347                 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
348                         hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
349                 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
350                         hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
351                 else
352                         BUG();
353                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
354                         hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
355         } else {
356                 hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
357                 hdr->gso_size = hdr->hdr_len = 0;
358         }
359
360         vnet_hdr_to_sg(sg, skb);
361         num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
362
363         err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
364         if (!err && !vi->free_in_tasklet)
365                 mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
366
367         return err;
368 }
369
370 static void xmit_tasklet(unsigned long data)
371 {
372         struct virtnet_info *vi = (void *)data;
373
374         netif_tx_lock_bh(vi->dev);
375         if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) {
376                 vi->svq->vq_ops->kick(vi->svq);
377                 vi->last_xmit_skb = NULL;
378         }
379         if (vi->free_in_tasklet)
380                 free_old_xmit_skbs(vi);
381         netif_tx_unlock_bh(vi->dev);
382 }
383
384 static int start_xmit(struct sk_buff *skb, struct net_device *dev)
385 {
386         struct virtnet_info *vi = netdev_priv(dev);
387
388 again:
389         /* Free up any pending old buffers before queueing new ones. */
390         free_old_xmit_skbs(vi);
391
392         /* If we has a buffer left over from last time, send it now. */
393         if (unlikely(vi->last_xmit_skb) &&
394             xmit_skb(vi, vi->last_xmit_skb) != 0)
395                 goto stop_queue;
396
397         vi->last_xmit_skb = NULL;
398
399         /* Put new one in send queue and do transmit */
400         if (likely(skb)) {
401                 __skb_queue_head(&vi->send, skb);
402                 if (xmit_skb(vi, skb) != 0) {
403                         vi->last_xmit_skb = skb;
404                         skb = NULL;
405                         goto stop_queue;
406                 }
407         }
408 done:
409         vi->svq->vq_ops->kick(vi->svq);
410         return NETDEV_TX_OK;
411
412 stop_queue:
413         pr_debug("%s: virtio not prepared to send\n", dev->name);
414         netif_stop_queue(dev);
415
416         /* Activate callback for using skbs: if this returns false it
417          * means some were used in the meantime. */
418         if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
419                 vi->svq->vq_ops->disable_cb(vi->svq);
420                 netif_start_queue(dev);
421                 goto again;
422         }
423         if (skb) {
424                 /* Drop this skb: we only queue one. */
425                 vi->dev->stats.tx_dropped++;
426                 kfree_skb(skb);
427         }
428         goto done;
429 }
430
431 #ifdef CONFIG_NET_POLL_CONTROLLER
432 static void virtnet_netpoll(struct net_device *dev)
433 {
434         struct virtnet_info *vi = netdev_priv(dev);
435
436         napi_schedule(&vi->napi);
437 }
438 #endif
439
440 static int virtnet_open(struct net_device *dev)
441 {
442         struct virtnet_info *vi = netdev_priv(dev);
443
444         napi_enable(&vi->napi);
445
446         /* If all buffers were filled by other side before we napi_enabled, we
447          * won't get another interrupt, so process any outstanding packets
448          * now.  virtnet_poll wants re-enable the queue, so we disable here.
449          * We synchronize against interrupts via NAPI_STATE_SCHED */
450         if (netif_rx_schedule_prep(dev, &vi->napi)) {
451                 vi->rvq->vq_ops->disable_cb(vi->rvq);
452                 __netif_rx_schedule(dev, &vi->napi);
453         }
454         return 0;
455 }
456
457 static int virtnet_close(struct net_device *dev)
458 {
459         struct virtnet_info *vi = netdev_priv(dev);
460
461         napi_disable(&vi->napi);
462
463         return 0;
464 }
465
466 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
467 {
468         struct virtnet_info *vi = netdev_priv(dev);
469         struct virtio_device *vdev = vi->vdev;
470
471         if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
472                 return -ENOSYS;
473
474         return ethtool_op_set_tx_hw_csum(dev, data);
475 }
476
477 static struct ethtool_ops virtnet_ethtool_ops = {
478         .set_tx_csum = virtnet_set_tx_csum,
479         .set_sg = ethtool_op_set_sg,
480 };
481
482 static int virtnet_probe(struct virtio_device *vdev)
483 {
484         int err;
485         struct net_device *dev;
486         struct virtnet_info *vi;
487
488         /* Allocate ourselves a network device with room for our info */
489         dev = alloc_etherdev(sizeof(struct virtnet_info));
490         if (!dev)
491                 return -ENOMEM;
492
493         /* Set up network device as normal. */
494         dev->open = virtnet_open;
495         dev->stop = virtnet_close;
496         dev->hard_start_xmit = start_xmit;
497         dev->features = NETIF_F_HIGHDMA;
498 #ifdef CONFIG_NET_POLL_CONTROLLER
499         dev->poll_controller = virtnet_netpoll;
500 #endif
501         SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
502         SET_NETDEV_DEV(dev, &vdev->dev);
503
504         /* Do we support "hardware" checksums? */
505         if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
506                 /* This opens up the world of extra features. */
507                 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
508                 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
509                         dev->features |= NETIF_F_TSO | NETIF_F_UFO
510                                 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
511                 }
512                 /* Individual feature bits: what can host handle? */
513                 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
514                         dev->features |= NETIF_F_TSO;
515                 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
516                         dev->features |= NETIF_F_TSO6;
517                 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
518                         dev->features |= NETIF_F_TSO_ECN;
519                 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
520                         dev->features |= NETIF_F_UFO;
521         }
522
523         /* Configuration may specify what MAC to use.  Otherwise random. */
524         if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
525                 vdev->config->get(vdev,
526                                   offsetof(struct virtio_net_config, mac),
527                                   dev->dev_addr, dev->addr_len);
528         } else
529                 random_ether_addr(dev->dev_addr);
530
531         /* Set up our device-specific information */
532         vi = netdev_priv(dev);
533         netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
534         vi->dev = dev;
535         vi->vdev = vdev;
536         vdev->priv = vi;
537         vi->pages = NULL;
538
539         /* If they give us a callback when all buffers are done, we don't need
540          * the timer. */
541         vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY);
542
543         /* If we can receive ANY GSO packets, we must allocate large ones. */
544         if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
545             || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
546             || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
547                 vi->big_packets = true;
548
549         /* We expect two virtqueues, receive then send. */
550         vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done);
551         if (IS_ERR(vi->rvq)) {
552                 err = PTR_ERR(vi->rvq);
553                 goto free;
554         }
555
556         vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done);
557         if (IS_ERR(vi->svq)) {
558                 err = PTR_ERR(vi->svq);
559                 goto free_recv;
560         }
561
562         /* Initialize our empty receive and send queues. */
563         skb_queue_head_init(&vi->recv);
564         skb_queue_head_init(&vi->send);
565
566         tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi);
567
568         if (!vi->free_in_tasklet)
569                 setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi);
570
571         err = register_netdev(dev);
572         if (err) {
573                 pr_debug("virtio_net: registering device failed\n");
574                 goto free_send;
575         }
576
577         /* Last of all, set up some receive buffers. */
578         try_fill_recv(vi);
579
580         /* If we didn't even get one input buffer, we're useless. */
581         if (vi->num == 0) {
582                 err = -ENOMEM;
583                 goto unregister;
584         }
585
586         pr_debug("virtnet: registered device %s\n", dev->name);
587         return 0;
588
589 unregister:
590         unregister_netdev(dev);
591 free_send:
592         vdev->config->del_vq(vi->svq);
593 free_recv:
594         vdev->config->del_vq(vi->rvq);
595 free:
596         free_netdev(dev);
597         return err;
598 }
599
600 static void virtnet_remove(struct virtio_device *vdev)
601 {
602         struct virtnet_info *vi = vdev->priv;
603         struct sk_buff *skb;
604
605         /* Stop all the virtqueues. */
606         vdev->config->reset(vdev);
607
608         if (!vi->free_in_tasklet)
609                 del_timer_sync(&vi->xmit_free_timer);
610
611         /* Free our skbs in send and recv queues, if any. */
612         while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
613                 kfree_skb(skb);
614                 vi->num--;
615         }
616         __skb_queue_purge(&vi->send);
617
618         BUG_ON(vi->num != 0);
619
620         vdev->config->del_vq(vi->svq);
621         vdev->config->del_vq(vi->rvq);
622         unregister_netdev(vi->dev);
623
624         while (vi->pages)
625                 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
626
627         free_netdev(vi->dev);
628 }
629
630 static struct virtio_device_id id_table[] = {
631         { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
632         { 0 },
633 };
634
635 static unsigned int features[] = {
636         VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
637         VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
638         VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
639         VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
640         VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */
641         VIRTIO_F_NOTIFY_ON_EMPTY,
642 };
643
644 static struct virtio_driver virtio_net = {
645         .feature_table = features,
646         .feature_table_size = ARRAY_SIZE(features),
647         .driver.name =  KBUILD_MODNAME,
648         .driver.owner = THIS_MODULE,
649         .id_table =     id_table,
650         .probe =        virtnet_probe,
651         .remove =       __devexit_p(virtnet_remove),
652 };
653
654 static int __init init(void)
655 {
656         return register_virtio_driver(&virtio_net);
657 }
658
659 static void __exit fini(void)
660 {
661         unregister_virtio_driver(&virtio_net);
662 }
663 module_init(init);
664 module_exit(fini);
665
666 MODULE_DEVICE_TABLE(virtio, id_table);
667 MODULE_DESCRIPTION("Virtio network driver");
668 MODULE_LICENSE("GPL");