virtio_console: Add support for remoteproc serial
[linux-3.10.git] / drivers / net / virtio_net.c
1 /* A 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 #include <linux/if_vlan.h>
28 #include <linux/slab.h>
29
30 static int napi_weight = 128;
31 module_param(napi_weight, int, 0444);
32
33 static bool csum = true, gso = true;
34 module_param(csum, bool, 0444);
35 module_param(gso, bool, 0444);
36
37 /* FIXME: MTU in config. */
38 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
39 #define GOOD_COPY_LEN   128
40
41 #define VIRTNET_SEND_COMMAND_SG_MAX    2
42 #define VIRTNET_DRIVER_VERSION "1.0.0"
43
44 struct virtnet_stats {
45         struct u64_stats_sync tx_syncp;
46         struct u64_stats_sync rx_syncp;
47         u64 tx_bytes;
48         u64 tx_packets;
49
50         u64 rx_bytes;
51         u64 rx_packets;
52 };
53
54 struct virtnet_info {
55         struct virtio_device *vdev;
56         struct virtqueue *rvq, *svq, *cvq;
57         struct net_device *dev;
58         struct napi_struct napi;
59         unsigned int status;
60
61         /* Number of input buffers, and max we've ever had. */
62         unsigned int num, max;
63
64         /* I like... big packets and I cannot lie! */
65         bool big_packets;
66
67         /* Host will merge rx buffers for big packets (shake it! shake it!) */
68         bool mergeable_rx_bufs;
69
70         /* enable config space updates */
71         bool config_enable;
72
73         /* Active statistics */
74         struct virtnet_stats __percpu *stats;
75
76         /* Work struct for refilling if we run low on memory. */
77         struct delayed_work refill;
78
79         /* Work struct for config space updates */
80         struct work_struct config_work;
81
82         /* Lock for config space updates */
83         struct mutex config_lock;
84
85         /* Chain pages by the private ptr. */
86         struct page *pages;
87
88         /* fragments + linear part + virtio header */
89         struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
90         struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
91 };
92
93 struct skb_vnet_hdr {
94         union {
95                 struct virtio_net_hdr hdr;
96                 struct virtio_net_hdr_mrg_rxbuf mhdr;
97         };
98 };
99
100 struct padded_vnet_hdr {
101         struct virtio_net_hdr hdr;
102         /*
103          * virtio_net_hdr should be in a separated sg buffer because of a
104          * QEMU bug, and data sg buffer shares same page with this header sg.
105          * This padding makes next sg 16 byte aligned after virtio_net_hdr.
106          */
107         char padding[6];
108 };
109
110 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
111 {
112         return (struct skb_vnet_hdr *)skb->cb;
113 }
114
115 /*
116  * private is used to chain pages for big packets, put the whole
117  * most recent used list in the beginning for reuse
118  */
119 static void give_pages(struct virtnet_info *vi, struct page *page)
120 {
121         struct page *end;
122
123         /* Find end of list, sew whole thing into vi->pages. */
124         for (end = page; end->private; end = (struct page *)end->private);
125         end->private = (unsigned long)vi->pages;
126         vi->pages = page;
127 }
128
129 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
130 {
131         struct page *p = vi->pages;
132
133         if (p) {
134                 vi->pages = (struct page *)p->private;
135                 /* clear private here, it is used to chain pages */
136                 p->private = 0;
137         } else
138                 p = alloc_page(gfp_mask);
139         return p;
140 }
141
142 static void skb_xmit_done(struct virtqueue *svq)
143 {
144         struct virtnet_info *vi = svq->vdev->priv;
145
146         /* Suppress further interrupts. */
147         virtqueue_disable_cb(svq);
148
149         /* We were probably waiting for more output buffers. */
150         netif_wake_queue(vi->dev);
151 }
152
153 static void set_skb_frag(struct sk_buff *skb, struct page *page,
154                          unsigned int offset, unsigned int *len)
155 {
156         int size = min((unsigned)PAGE_SIZE - offset, *len);
157         int i = skb_shinfo(skb)->nr_frags;
158
159         __skb_fill_page_desc(skb, i, page, offset, size);
160
161         skb->data_len += size;
162         skb->len += size;
163         skb->truesize += PAGE_SIZE;
164         skb_shinfo(skb)->nr_frags++;
165         *len -= size;
166 }
167
168 /* Called from bottom half context */
169 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
170                                    struct page *page, unsigned int len)
171 {
172         struct sk_buff *skb;
173         struct skb_vnet_hdr *hdr;
174         unsigned int copy, hdr_len, offset;
175         char *p;
176
177         p = page_address(page);
178
179         /* copy small packet so we can reuse these pages for small data */
180         skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
181         if (unlikely(!skb))
182                 return NULL;
183
184         hdr = skb_vnet_hdr(skb);
185
186         if (vi->mergeable_rx_bufs) {
187                 hdr_len = sizeof hdr->mhdr;
188                 offset = hdr_len;
189         } else {
190                 hdr_len = sizeof hdr->hdr;
191                 offset = sizeof(struct padded_vnet_hdr);
192         }
193
194         memcpy(hdr, p, hdr_len);
195
196         len -= hdr_len;
197         p += offset;
198
199         copy = len;
200         if (copy > skb_tailroom(skb))
201                 copy = skb_tailroom(skb);
202         memcpy(skb_put(skb, copy), p, copy);
203
204         len -= copy;
205         offset += copy;
206
207         /*
208          * Verify that we can indeed put this data into a skb.
209          * This is here to handle cases when the device erroneously
210          * tries to receive more than is possible. This is usually
211          * the case of a broken device.
212          */
213         if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
214                 if (net_ratelimit())
215                         pr_debug("%s: too much data\n", skb->dev->name);
216                 dev_kfree_skb(skb);
217                 return NULL;
218         }
219
220         while (len) {
221                 set_skb_frag(skb, page, offset, &len);
222                 page = (struct page *)page->private;
223                 offset = 0;
224         }
225
226         if (page)
227                 give_pages(vi, page);
228
229         return skb;
230 }
231
232 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
233 {
234         struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
235         struct page *page;
236         int num_buf, i, len;
237
238         num_buf = hdr->mhdr.num_buffers;
239         while (--num_buf) {
240                 i = skb_shinfo(skb)->nr_frags;
241                 if (i >= MAX_SKB_FRAGS) {
242                         pr_debug("%s: packet too long\n", skb->dev->name);
243                         skb->dev->stats.rx_length_errors++;
244                         return -EINVAL;
245                 }
246                 page = virtqueue_get_buf(vi->rvq, &len);
247                 if (!page) {
248                         pr_debug("%s: rx error: %d buffers missing\n",
249                                  skb->dev->name, hdr->mhdr.num_buffers);
250                         skb->dev->stats.rx_length_errors++;
251                         return -EINVAL;
252                 }
253
254                 if (len > PAGE_SIZE)
255                         len = PAGE_SIZE;
256
257                 set_skb_frag(skb, page, 0, &len);
258
259                 --vi->num;
260         }
261         return 0;
262 }
263
264 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
265 {
266         struct virtnet_info *vi = netdev_priv(dev);
267         struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
268         struct sk_buff *skb;
269         struct page *page;
270         struct skb_vnet_hdr *hdr;
271
272         if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
273                 pr_debug("%s: short packet %i\n", dev->name, len);
274                 dev->stats.rx_length_errors++;
275                 if (vi->mergeable_rx_bufs || vi->big_packets)
276                         give_pages(vi, buf);
277                 else
278                         dev_kfree_skb(buf);
279                 return;
280         }
281
282         if (!vi->mergeable_rx_bufs && !vi->big_packets) {
283                 skb = buf;
284                 len -= sizeof(struct virtio_net_hdr);
285                 skb_trim(skb, len);
286         } else {
287                 page = buf;
288                 skb = page_to_skb(vi, page, len);
289                 if (unlikely(!skb)) {
290                         dev->stats.rx_dropped++;
291                         give_pages(vi, page);
292                         return;
293                 }
294                 if (vi->mergeable_rx_bufs)
295                         if (receive_mergeable(vi, skb)) {
296                                 dev_kfree_skb(skb);
297                                 return;
298                         }
299         }
300
301         hdr = skb_vnet_hdr(skb);
302
303         u64_stats_update_begin(&stats->rx_syncp);
304         stats->rx_bytes += skb->len;
305         stats->rx_packets++;
306         u64_stats_update_end(&stats->rx_syncp);
307
308         if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
309                 pr_debug("Needs csum!\n");
310                 if (!skb_partial_csum_set(skb,
311                                           hdr->hdr.csum_start,
312                                           hdr->hdr.csum_offset))
313                         goto frame_err;
314         } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
315                 skb->ip_summed = CHECKSUM_UNNECESSARY;
316         }
317
318         skb->protocol = eth_type_trans(skb, dev);
319         pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
320                  ntohs(skb->protocol), skb->len, skb->pkt_type);
321
322         if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
323                 pr_debug("GSO!\n");
324                 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
325                 case VIRTIO_NET_HDR_GSO_TCPV4:
326                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
327                         break;
328                 case VIRTIO_NET_HDR_GSO_UDP:
329                         skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
330                         break;
331                 case VIRTIO_NET_HDR_GSO_TCPV6:
332                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
333                         break;
334                 default:
335                         if (net_ratelimit())
336                                 printk(KERN_WARNING "%s: bad gso type %u.\n",
337                                        dev->name, hdr->hdr.gso_type);
338                         goto frame_err;
339                 }
340
341                 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
342                         skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
343
344                 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
345                 if (skb_shinfo(skb)->gso_size == 0) {
346                         if (net_ratelimit())
347                                 printk(KERN_WARNING "%s: zero gso size.\n",
348                                        dev->name);
349                         goto frame_err;
350                 }
351
352                 /* Header must be checked, and gso_segs computed. */
353                 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
354                 skb_shinfo(skb)->gso_segs = 0;
355         }
356
357         netif_receive_skb(skb);
358         return;
359
360 frame_err:
361         dev->stats.rx_frame_errors++;
362         dev_kfree_skb(skb);
363 }
364
365 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
366 {
367         struct sk_buff *skb;
368         struct skb_vnet_hdr *hdr;
369         int err;
370
371         skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
372         if (unlikely(!skb))
373                 return -ENOMEM;
374
375         skb_put(skb, MAX_PACKET_LEN);
376
377         hdr = skb_vnet_hdr(skb);
378         sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
379
380         skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
381
382         err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
383         if (err < 0)
384                 dev_kfree_skb(skb);
385
386         return err;
387 }
388
389 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
390 {
391         struct page *first, *list = NULL;
392         char *p;
393         int i, err, offset;
394
395         /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
396         for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
397                 first = get_a_page(vi, gfp);
398                 if (!first) {
399                         if (list)
400                                 give_pages(vi, list);
401                         return -ENOMEM;
402                 }
403                 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
404
405                 /* chain new page in list head to match sg */
406                 first->private = (unsigned long)list;
407                 list = first;
408         }
409
410         first = get_a_page(vi, gfp);
411         if (!first) {
412                 give_pages(vi, list);
413                 return -ENOMEM;
414         }
415         p = page_address(first);
416
417         /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
418         /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
419         sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
420
421         /* vi->rx_sg[1] for data packet, from offset */
422         offset = sizeof(struct padded_vnet_hdr);
423         sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
424
425         /* chain first in list head */
426         first->private = (unsigned long)list;
427         err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
428                                 first, gfp);
429         if (err < 0)
430                 give_pages(vi, first);
431
432         return err;
433 }
434
435 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
436 {
437         struct page *page;
438         int err;
439
440         page = get_a_page(vi, gfp);
441         if (!page)
442                 return -ENOMEM;
443
444         sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
445
446         err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
447         if (err < 0)
448                 give_pages(vi, page);
449
450         return err;
451 }
452
453 /*
454  * Returns false if we couldn't fill entirely (OOM).
455  *
456  * Normally run in the receive path, but can also be run from ndo_open
457  * before we're receiving packets, or from refill_work which is
458  * careful to disable receiving (using napi_disable).
459  */
460 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
461 {
462         int err;
463         bool oom;
464
465         do {
466                 if (vi->mergeable_rx_bufs)
467                         err = add_recvbuf_mergeable(vi, gfp);
468                 else if (vi->big_packets)
469                         err = add_recvbuf_big(vi, gfp);
470                 else
471                         err = add_recvbuf_small(vi, gfp);
472
473                 oom = err == -ENOMEM;
474                 if (err)
475                         break;
476                 ++vi->num;
477         } while (vi->rvq->num_free);
478
479         if (unlikely(vi->num > vi->max))
480                 vi->max = vi->num;
481         virtqueue_kick(vi->rvq);
482         return !oom;
483 }
484
485 static void skb_recv_done(struct virtqueue *rvq)
486 {
487         struct virtnet_info *vi = rvq->vdev->priv;
488         /* Schedule NAPI, Suppress further interrupts if successful. */
489         if (napi_schedule_prep(&vi->napi)) {
490                 virtqueue_disable_cb(rvq);
491                 __napi_schedule(&vi->napi);
492         }
493 }
494
495 static void virtnet_napi_enable(struct virtnet_info *vi)
496 {
497         napi_enable(&vi->napi);
498
499         /* If all buffers were filled by other side before we napi_enabled, we
500          * won't get another interrupt, so process any outstanding packets
501          * now.  virtnet_poll wants re-enable the queue, so we disable here.
502          * We synchronize against interrupts via NAPI_STATE_SCHED */
503         if (napi_schedule_prep(&vi->napi)) {
504                 virtqueue_disable_cb(vi->rvq);
505                 local_bh_disable();
506                 __napi_schedule(&vi->napi);
507                 local_bh_enable();
508         }
509 }
510
511 static void refill_work(struct work_struct *work)
512 {
513         struct virtnet_info *vi;
514         bool still_empty;
515
516         vi = container_of(work, struct virtnet_info, refill.work);
517         napi_disable(&vi->napi);
518         still_empty = !try_fill_recv(vi, GFP_KERNEL);
519         virtnet_napi_enable(vi);
520
521         /* In theory, this can happen: if we don't get any buffers in
522          * we will *never* try to fill again. */
523         if (still_empty)
524                 schedule_delayed_work(&vi->refill, HZ/2);
525 }
526
527 static int virtnet_poll(struct napi_struct *napi, int budget)
528 {
529         struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
530         void *buf;
531         unsigned int len, received = 0;
532
533 again:
534         while (received < budget &&
535                (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
536                 receive_buf(vi->dev, buf, len);
537                 --vi->num;
538                 received++;
539         }
540
541         if (vi->num < vi->max / 2) {
542                 if (!try_fill_recv(vi, GFP_ATOMIC))
543                         schedule_delayed_work(&vi->refill, 0);
544         }
545
546         /* Out of packets? */
547         if (received < budget) {
548                 napi_complete(napi);
549                 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
550                     napi_schedule_prep(napi)) {
551                         virtqueue_disable_cb(vi->rvq);
552                         __napi_schedule(napi);
553                         goto again;
554                 }
555         }
556
557         return received;
558 }
559
560 static void free_old_xmit_skbs(struct virtnet_info *vi)
561 {
562         struct sk_buff *skb;
563         unsigned int len;
564         struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
565
566         while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
567                 pr_debug("Sent skb %p\n", skb);
568
569                 u64_stats_update_begin(&stats->tx_syncp);
570                 stats->tx_bytes += skb->len;
571                 stats->tx_packets++;
572                 u64_stats_update_end(&stats->tx_syncp);
573
574                 dev_kfree_skb_any(skb);
575         }
576 }
577
578 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
579 {
580         struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
581         const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
582         unsigned num_sg;
583
584         pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
585
586         if (skb->ip_summed == CHECKSUM_PARTIAL) {
587                 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
588                 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
589                 hdr->hdr.csum_offset = skb->csum_offset;
590         } else {
591                 hdr->hdr.flags = 0;
592                 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
593         }
594
595         if (skb_is_gso(skb)) {
596                 hdr->hdr.hdr_len = skb_headlen(skb);
597                 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
598                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
599                         hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
600                 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
601                         hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
602                 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
603                         hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
604                 else
605                         BUG();
606                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
607                         hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
608         } else {
609                 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
610                 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
611         }
612
613         hdr->mhdr.num_buffers = 0;
614
615         /* Encode metadata header at front. */
616         if (vi->mergeable_rx_bufs)
617                 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
618         else
619                 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
620
621         num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
622         return virtqueue_add_buf(vi->svq, vi->tx_sg, num_sg,
623                                  0, skb, GFP_ATOMIC);
624 }
625
626 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
627 {
628         struct virtnet_info *vi = netdev_priv(dev);
629         int err;
630
631         /* Free up any pending old buffers before queueing new ones. */
632         free_old_xmit_skbs(vi);
633
634         /* Try to transmit */
635         err = xmit_skb(vi, skb);
636
637         /* This should not happen! */
638         if (unlikely(err)) {
639                 dev->stats.tx_fifo_errors++;
640                 if (net_ratelimit())
641                         dev_warn(&dev->dev,
642                                  "Unexpected TX queue failure: %d\n", err);
643                 dev->stats.tx_dropped++;
644                 kfree_skb(skb);
645                 return NETDEV_TX_OK;
646         }
647         virtqueue_kick(vi->svq);
648
649         /* Don't wait up for transmitted skbs to be freed. */
650         skb_orphan(skb);
651         nf_reset(skb);
652
653         /* Apparently nice girls don't return TX_BUSY; stop the queue
654          * before it gets out of hand.  Naturally, this wastes entries. */
655         if (vi->svq->num_free < 2+MAX_SKB_FRAGS) {
656                 netif_stop_queue(dev);
657                 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
658                         /* More just got used, free them then recheck. */
659                         free_old_xmit_skbs(vi);
660                         if (vi->svq->num_free >= 2+MAX_SKB_FRAGS) {
661                                 netif_start_queue(dev);
662                                 virtqueue_disable_cb(vi->svq);
663                         }
664                 }
665         }
666
667         return NETDEV_TX_OK;
668 }
669
670 static int virtnet_set_mac_address(struct net_device *dev, void *p)
671 {
672         struct virtnet_info *vi = netdev_priv(dev);
673         struct virtio_device *vdev = vi->vdev;
674         int ret;
675
676         ret = eth_mac_addr(dev, p);
677         if (ret)
678                 return ret;
679
680         if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
681                 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
682                                   dev->dev_addr, dev->addr_len);
683
684         return 0;
685 }
686
687 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
688                                                struct rtnl_link_stats64 *tot)
689 {
690         struct virtnet_info *vi = netdev_priv(dev);
691         int cpu;
692         unsigned int start;
693
694         for_each_possible_cpu(cpu) {
695                 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
696                 u64 tpackets, tbytes, rpackets, rbytes;
697
698                 do {
699                         start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
700                         tpackets = stats->tx_packets;
701                         tbytes   = stats->tx_bytes;
702                 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
703
704                 do {
705                         start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
706                         rpackets = stats->rx_packets;
707                         rbytes   = stats->rx_bytes;
708                 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
709
710                 tot->rx_packets += rpackets;
711                 tot->tx_packets += tpackets;
712                 tot->rx_bytes   += rbytes;
713                 tot->tx_bytes   += tbytes;
714         }
715
716         tot->tx_dropped = dev->stats.tx_dropped;
717         tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
718         tot->rx_dropped = dev->stats.rx_dropped;
719         tot->rx_length_errors = dev->stats.rx_length_errors;
720         tot->rx_frame_errors = dev->stats.rx_frame_errors;
721
722         return tot;
723 }
724
725 #ifdef CONFIG_NET_POLL_CONTROLLER
726 static void virtnet_netpoll(struct net_device *dev)
727 {
728         struct virtnet_info *vi = netdev_priv(dev);
729
730         napi_schedule(&vi->napi);
731 }
732 #endif
733
734 static int virtnet_open(struct net_device *dev)
735 {
736         struct virtnet_info *vi = netdev_priv(dev);
737
738         /* Make sure we have some buffers: if oom use wq. */
739         if (!try_fill_recv(vi, GFP_KERNEL))
740                 schedule_delayed_work(&vi->refill, 0);
741
742         virtnet_napi_enable(vi);
743         return 0;
744 }
745
746 /*
747  * Send command via the control virtqueue and check status.  Commands
748  * supported by the hypervisor, as indicated by feature bits, should
749  * never fail unless improperly formated.
750  */
751 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
752                                  struct scatterlist *data, int out, int in)
753 {
754         struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
755         struct virtio_net_ctrl_hdr ctrl;
756         virtio_net_ctrl_ack status = ~0;
757         unsigned int tmp;
758         int i;
759
760         /* Caller should know better */
761         BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
762                 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
763
764         out++; /* Add header */
765         in++; /* Add return status */
766
767         ctrl.class = class;
768         ctrl.cmd = cmd;
769
770         sg_init_table(sg, out + in);
771
772         sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
773         for_each_sg(data, s, out + in - 2, i)
774                 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
775         sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
776
777         BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
778
779         virtqueue_kick(vi->cvq);
780
781         /*
782          * Spin for a response, the kick causes an ioport write, trapping
783          * into the hypervisor, so the request should be handled immediately.
784          */
785         while (!virtqueue_get_buf(vi->cvq, &tmp))
786                 cpu_relax();
787
788         return status == VIRTIO_NET_OK;
789 }
790
791 static void virtnet_ack_link_announce(struct virtnet_info *vi)
792 {
793         rtnl_lock();
794         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
795                                   VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL,
796                                   0, 0))
797                 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
798         rtnl_unlock();
799 }
800
801 static int virtnet_close(struct net_device *dev)
802 {
803         struct virtnet_info *vi = netdev_priv(dev);
804
805         /* Make sure refill_work doesn't re-enable napi! */
806         cancel_delayed_work_sync(&vi->refill);
807         napi_disable(&vi->napi);
808
809         return 0;
810 }
811
812 static void virtnet_set_rx_mode(struct net_device *dev)
813 {
814         struct virtnet_info *vi = netdev_priv(dev);
815         struct scatterlist sg[2];
816         u8 promisc, allmulti;
817         struct virtio_net_ctrl_mac *mac_data;
818         struct netdev_hw_addr *ha;
819         int uc_count;
820         int mc_count;
821         void *buf;
822         int i;
823
824         /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
825         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
826                 return;
827
828         promisc = ((dev->flags & IFF_PROMISC) != 0);
829         allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
830
831         sg_init_one(sg, &promisc, sizeof(promisc));
832
833         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
834                                   VIRTIO_NET_CTRL_RX_PROMISC,
835                                   sg, 1, 0))
836                 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
837                          promisc ? "en" : "dis");
838
839         sg_init_one(sg, &allmulti, sizeof(allmulti));
840
841         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
842                                   VIRTIO_NET_CTRL_RX_ALLMULTI,
843                                   sg, 1, 0))
844                 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
845                          allmulti ? "en" : "dis");
846
847         uc_count = netdev_uc_count(dev);
848         mc_count = netdev_mc_count(dev);
849         /* MAC filter - use one buffer for both lists */
850         buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
851                       (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
852         mac_data = buf;
853         if (!buf) {
854                 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
855                 return;
856         }
857
858         sg_init_table(sg, 2);
859
860         /* Store the unicast list and count in the front of the buffer */
861         mac_data->entries = uc_count;
862         i = 0;
863         netdev_for_each_uc_addr(ha, dev)
864                 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
865
866         sg_set_buf(&sg[0], mac_data,
867                    sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
868
869         /* multicast list and count fill the end */
870         mac_data = (void *)&mac_data->macs[uc_count][0];
871
872         mac_data->entries = mc_count;
873         i = 0;
874         netdev_for_each_mc_addr(ha, dev)
875                 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
876
877         sg_set_buf(&sg[1], mac_data,
878                    sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
879
880         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
881                                   VIRTIO_NET_CTRL_MAC_TABLE_SET,
882                                   sg, 2, 0))
883                 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
884
885         kfree(buf);
886 }
887
888 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
889 {
890         struct virtnet_info *vi = netdev_priv(dev);
891         struct scatterlist sg;
892
893         sg_init_one(&sg, &vid, sizeof(vid));
894
895         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
896                                   VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
897                 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
898         return 0;
899 }
900
901 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
902 {
903         struct virtnet_info *vi = netdev_priv(dev);
904         struct scatterlist sg;
905
906         sg_init_one(&sg, &vid, sizeof(vid));
907
908         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
909                                   VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
910                 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
911         return 0;
912 }
913
914 static void virtnet_get_ringparam(struct net_device *dev,
915                                 struct ethtool_ringparam *ring)
916 {
917         struct virtnet_info *vi = netdev_priv(dev);
918
919         ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
920         ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
921         ring->rx_pending = ring->rx_max_pending;
922         ring->tx_pending = ring->tx_max_pending;
923
924 }
925
926
927 static void virtnet_get_drvinfo(struct net_device *dev,
928                                 struct ethtool_drvinfo *info)
929 {
930         struct virtnet_info *vi = netdev_priv(dev);
931         struct virtio_device *vdev = vi->vdev;
932
933         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
934         strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
935         strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
936
937 }
938
939 static const struct ethtool_ops virtnet_ethtool_ops = {
940         .get_drvinfo = virtnet_get_drvinfo,
941         .get_link = ethtool_op_get_link,
942         .get_ringparam = virtnet_get_ringparam,
943 };
944
945 #define MIN_MTU 68
946 #define MAX_MTU 65535
947
948 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
949 {
950         if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
951                 return -EINVAL;
952         dev->mtu = new_mtu;
953         return 0;
954 }
955
956 static const struct net_device_ops virtnet_netdev = {
957         .ndo_open            = virtnet_open,
958         .ndo_stop            = virtnet_close,
959         .ndo_start_xmit      = start_xmit,
960         .ndo_validate_addr   = eth_validate_addr,
961         .ndo_set_mac_address = virtnet_set_mac_address,
962         .ndo_set_rx_mode     = virtnet_set_rx_mode,
963         .ndo_change_mtu      = virtnet_change_mtu,
964         .ndo_get_stats64     = virtnet_stats,
965         .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
966         .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
967 #ifdef CONFIG_NET_POLL_CONTROLLER
968         .ndo_poll_controller = virtnet_netpoll,
969 #endif
970 };
971
972 static void virtnet_config_changed_work(struct work_struct *work)
973 {
974         struct virtnet_info *vi =
975                 container_of(work, struct virtnet_info, config_work);
976         u16 v;
977
978         mutex_lock(&vi->config_lock);
979         if (!vi->config_enable)
980                 goto done;
981
982         if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
983                               offsetof(struct virtio_net_config, status),
984                               &v) < 0)
985                 goto done;
986
987         if (v & VIRTIO_NET_S_ANNOUNCE) {
988                 netdev_notify_peers(vi->dev);
989                 virtnet_ack_link_announce(vi);
990         }
991
992         /* Ignore unknown (future) status bits */
993         v &= VIRTIO_NET_S_LINK_UP;
994
995         if (vi->status == v)
996                 goto done;
997
998         vi->status = v;
999
1000         if (vi->status & VIRTIO_NET_S_LINK_UP) {
1001                 netif_carrier_on(vi->dev);
1002                 netif_wake_queue(vi->dev);
1003         } else {
1004                 netif_carrier_off(vi->dev);
1005                 netif_stop_queue(vi->dev);
1006         }
1007 done:
1008         mutex_unlock(&vi->config_lock);
1009 }
1010
1011 static void virtnet_config_changed(struct virtio_device *vdev)
1012 {
1013         struct virtnet_info *vi = vdev->priv;
1014
1015         schedule_work(&vi->config_work);
1016 }
1017
1018 static int init_vqs(struct virtnet_info *vi)
1019 {
1020         struct virtqueue *vqs[3];
1021         vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
1022         const char *names[] = { "input", "output", "control" };
1023         int nvqs, err;
1024
1025         /* We expect two virtqueues, receive then send,
1026          * and optionally control. */
1027         nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
1028
1029         err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
1030         if (err)
1031                 return err;
1032
1033         vi->rvq = vqs[0];
1034         vi->svq = vqs[1];
1035
1036         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
1037                 vi->cvq = vqs[2];
1038
1039                 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1040                         vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1041         }
1042         return 0;
1043 }
1044
1045 static int virtnet_probe(struct virtio_device *vdev)
1046 {
1047         int err;
1048         struct net_device *dev;
1049         struct virtnet_info *vi;
1050
1051         /* Allocate ourselves a network device with room for our info */
1052         dev = alloc_etherdev(sizeof(struct virtnet_info));
1053         if (!dev)
1054                 return -ENOMEM;
1055
1056         /* Set up network device as normal. */
1057         dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1058         dev->netdev_ops = &virtnet_netdev;
1059         dev->features = NETIF_F_HIGHDMA;
1060
1061         SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1062         SET_NETDEV_DEV(dev, &vdev->dev);
1063
1064         /* Do we support "hardware" checksums? */
1065         if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1066                 /* This opens up the world of extra features. */
1067                 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1068                 if (csum)
1069                         dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1070
1071                 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1072                         dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1073                                 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1074                 }
1075                 /* Individual feature bits: what can host handle? */
1076                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1077                         dev->hw_features |= NETIF_F_TSO;
1078                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1079                         dev->hw_features |= NETIF_F_TSO6;
1080                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1081                         dev->hw_features |= NETIF_F_TSO_ECN;
1082                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1083                         dev->hw_features |= NETIF_F_UFO;
1084
1085                 if (gso)
1086                         dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1087                 /* (!csum && gso) case will be fixed by register_netdev() */
1088         }
1089
1090         /* Configuration may specify what MAC to use.  Otherwise random. */
1091         if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1092                                   offsetof(struct virtio_net_config, mac),
1093                                   dev->dev_addr, dev->addr_len) < 0)
1094                 eth_hw_addr_random(dev);
1095
1096         /* Set up our device-specific information */
1097         vi = netdev_priv(dev);
1098         netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
1099         vi->dev = dev;
1100         vi->vdev = vdev;
1101         vdev->priv = vi;
1102         vi->pages = NULL;
1103         vi->stats = alloc_percpu(struct virtnet_stats);
1104         err = -ENOMEM;
1105         if (vi->stats == NULL)
1106                 goto free;
1107
1108         INIT_DELAYED_WORK(&vi->refill, refill_work);
1109         mutex_init(&vi->config_lock);
1110         vi->config_enable = true;
1111         INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1112         sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1113         sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
1114
1115         /* If we can receive ANY GSO packets, we must allocate large ones. */
1116         if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1117             virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1118             virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1119                 vi->big_packets = true;
1120
1121         if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1122                 vi->mergeable_rx_bufs = true;
1123
1124         err = init_vqs(vi);
1125         if (err)
1126                 goto free_stats;
1127
1128         err = register_netdev(dev);
1129         if (err) {
1130                 pr_debug("virtio_net: registering device failed\n");
1131                 goto free_vqs;
1132         }
1133
1134         /* Last of all, set up some receive buffers. */
1135         try_fill_recv(vi, GFP_KERNEL);
1136
1137         /* If we didn't even get one input buffer, we're useless. */
1138         if (vi->num == 0) {
1139                 err = -ENOMEM;
1140                 goto unregister;
1141         }
1142
1143         /* Assume link up if device can't report link status,
1144            otherwise get link status from config. */
1145         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1146                 netif_carrier_off(dev);
1147                 schedule_work(&vi->config_work);
1148         } else {
1149                 vi->status = VIRTIO_NET_S_LINK_UP;
1150                 netif_carrier_on(dev);
1151         }
1152
1153         pr_debug("virtnet: registered device %s\n", dev->name);
1154         return 0;
1155
1156 unregister:
1157         unregister_netdev(dev);
1158 free_vqs:
1159         vdev->config->del_vqs(vdev);
1160 free_stats:
1161         free_percpu(vi->stats);
1162 free:
1163         free_netdev(dev);
1164         return err;
1165 }
1166
1167 static void free_unused_bufs(struct virtnet_info *vi)
1168 {
1169         void *buf;
1170         while (1) {
1171                 buf = virtqueue_detach_unused_buf(vi->svq);
1172                 if (!buf)
1173                         break;
1174                 dev_kfree_skb(buf);
1175         }
1176         while (1) {
1177                 buf = virtqueue_detach_unused_buf(vi->rvq);
1178                 if (!buf)
1179                         break;
1180                 if (vi->mergeable_rx_bufs || vi->big_packets)
1181                         give_pages(vi, buf);
1182                 else
1183                         dev_kfree_skb(buf);
1184                 --vi->num;
1185         }
1186         BUG_ON(vi->num != 0);
1187 }
1188
1189 static void remove_vq_common(struct virtnet_info *vi)
1190 {
1191         vi->vdev->config->reset(vi->vdev);
1192
1193         /* Free unused buffers in both send and recv, if any. */
1194         free_unused_bufs(vi);
1195
1196         vi->vdev->config->del_vqs(vi->vdev);
1197
1198         while (vi->pages)
1199                 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1200 }
1201
1202 static void __devexit virtnet_remove(struct virtio_device *vdev)
1203 {
1204         struct virtnet_info *vi = vdev->priv;
1205
1206         /* Prevent config work handler from accessing the device. */
1207         mutex_lock(&vi->config_lock);
1208         vi->config_enable = false;
1209         mutex_unlock(&vi->config_lock);
1210
1211         unregister_netdev(vi->dev);
1212
1213         remove_vq_common(vi);
1214
1215         flush_work(&vi->config_work);
1216
1217         free_percpu(vi->stats);
1218         free_netdev(vi->dev);
1219 }
1220
1221 #ifdef CONFIG_PM
1222 static int virtnet_freeze(struct virtio_device *vdev)
1223 {
1224         struct virtnet_info *vi = vdev->priv;
1225
1226         /* Prevent config work handler from accessing the device */
1227         mutex_lock(&vi->config_lock);
1228         vi->config_enable = false;
1229         mutex_unlock(&vi->config_lock);
1230
1231         netif_device_detach(vi->dev);
1232         cancel_delayed_work_sync(&vi->refill);
1233
1234         if (netif_running(vi->dev))
1235                 napi_disable(&vi->napi);
1236
1237         remove_vq_common(vi);
1238
1239         flush_work(&vi->config_work);
1240
1241         return 0;
1242 }
1243
1244 static int virtnet_restore(struct virtio_device *vdev)
1245 {
1246         struct virtnet_info *vi = vdev->priv;
1247         int err;
1248
1249         err = init_vqs(vi);
1250         if (err)
1251                 return err;
1252
1253         if (netif_running(vi->dev))
1254                 virtnet_napi_enable(vi);
1255
1256         netif_device_attach(vi->dev);
1257
1258         if (!try_fill_recv(vi, GFP_KERNEL))
1259                 schedule_delayed_work(&vi->refill, 0);
1260
1261         mutex_lock(&vi->config_lock);
1262         vi->config_enable = true;
1263         mutex_unlock(&vi->config_lock);
1264
1265         return 0;
1266 }
1267 #endif
1268
1269 static struct virtio_device_id id_table[] = {
1270         { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1271         { 0 },
1272 };
1273
1274 static unsigned int features[] = {
1275         VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1276         VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1277         VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1278         VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1279         VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1280         VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1281         VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1282         VIRTIO_NET_F_GUEST_ANNOUNCE,
1283 };
1284
1285 static struct virtio_driver virtio_net_driver = {
1286         .feature_table = features,
1287         .feature_table_size = ARRAY_SIZE(features),
1288         .driver.name =  KBUILD_MODNAME,
1289         .driver.owner = THIS_MODULE,
1290         .id_table =     id_table,
1291         .probe =        virtnet_probe,
1292         .remove =       __devexit_p(virtnet_remove),
1293         .config_changed = virtnet_config_changed,
1294 #ifdef CONFIG_PM
1295         .freeze =       virtnet_freeze,
1296         .restore =      virtnet_restore,
1297 #endif
1298 };
1299
1300 static int __init init(void)
1301 {
1302         return register_virtio_driver(&virtio_net_driver);
1303 }
1304
1305 static void __exit fini(void)
1306 {
1307         unregister_virtio_driver(&virtio_net_driver);
1308 }
1309 module_init(init);
1310 module_exit(fini);
1311
1312 MODULE_DEVICE_TABLE(virtio, id_table);
1313 MODULE_DESCRIPTION("Virtio network driver");
1314 MODULE_LICENSE("GPL");