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Full support for Ginger Console
[linux-ginger.git] / drivers / net / virtio_net.c
blob8d009760277cede76fead3a54edf2c7669a7acbc
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_ids.h>
26 #include <linux/virtio_net.h>
27 #include <linux/scatterlist.h>
28 #include <linux/if_vlan.h>
29
30 static int napi_weight = 128;
31 module_param(napi_weight, int, 0444);
32
33 static int csum = 1, gso = 1;
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
43 struct virtnet_info
44 {
45 struct virtio_device *vdev;
46 struct virtqueue *rvq, *svq, *cvq;
47 struct net_device *dev;
48 struct napi_struct napi;
49 unsigned int status;
50
51 /* Number of input buffers, and max we've ever had. */
52 unsigned int num, max;
53
54 /* I like... big packets and I cannot lie! */
55 bool big_packets;
56
57 /* Host will merge rx buffers for big packets (shake it! shake it!) */
58 bool mergeable_rx_bufs;
59
60 /* Receive & send queues. */
61 struct sk_buff_head recv;
62 struct sk_buff_head send;
63
64 /* Work struct for refilling if we run low on memory. */
65 struct delayed_work refill;
66
67 /* Chain pages by the private ptr. */
68 struct page *pages;
69 };
70
71 struct skb_vnet_hdr {
72 union {
73 struct virtio_net_hdr hdr;
74 struct virtio_net_hdr_mrg_rxbuf mhdr;
75 };
76 unsigned int num_sg;
77 };
78
79 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
80 {
81 return (struct skb_vnet_hdr *)skb->cb;
82 }
83
84 static void give_a_page(struct virtnet_info *vi, struct page *page)
85 {
86 page->private = (unsigned long)vi->pages;
87 vi->pages = page;
88 }
89
90 static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb)
91 {
92 unsigned int i;
93
94 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
95 give_a_page(vi, skb_shinfo(skb)->frags[i].page);
96 skb_shinfo(skb)->nr_frags = 0;
97 skb->data_len = 0;
98 }
99
100 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
101 {
102 struct page *p = vi->pages;
103
104 if (p)
105 vi->pages = (struct page *)p->private;
106 else
107 p = alloc_page(gfp_mask);
108 return p;
109 }
110
111 static void skb_xmit_done(struct virtqueue *svq)
112 {
113 struct virtnet_info *vi = svq->vdev->priv;
114
115 /* Suppress further interrupts. */
116 svq->vq_ops->disable_cb(svq);
117
118 /* We were probably waiting for more output buffers. */
119 netif_wake_queue(vi->dev);
120 }
121
122 static void receive_skb(struct net_device *dev, struct sk_buff *skb,
123 unsigned len)
124 {
125 struct virtnet_info *vi = netdev_priv(dev);
126 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
127 int err;
128 int i;
129
130 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
131 pr_debug("%s: short packet %i\n", dev->name, len);
132 dev->stats.rx_length_errors++;
133 goto drop;
134 }
135
136 if (vi->mergeable_rx_bufs) {
137 unsigned int copy;
138 char *p = page_address(skb_shinfo(skb)->frags[0].page);
139
140 if (len > PAGE_SIZE)
141 len = PAGE_SIZE;
142 len -= sizeof(struct virtio_net_hdr_mrg_rxbuf);
143
144 memcpy(&hdr->mhdr, p, sizeof(hdr->mhdr));
145 p += sizeof(hdr->mhdr);
146
147 copy = len;
148 if (copy > skb_tailroom(skb))
149 copy = skb_tailroom(skb);
150
151 memcpy(skb_put(skb, copy), p, copy);
152
153 len -= copy;
154
155 if (!len) {
156 give_a_page(vi, skb_shinfo(skb)->frags[0].page);
157 skb_shinfo(skb)->nr_frags--;
158 } else {
159 skb_shinfo(skb)->frags[0].page_offset +=
160 sizeof(hdr->mhdr) + copy;
161 skb_shinfo(skb)->frags[0].size = len;
162 skb->data_len += len;
163 skb->len += len;
164 }
165
166 while (--hdr->mhdr.num_buffers) {
167 struct sk_buff *nskb;
168
169 i = skb_shinfo(skb)->nr_frags;
170 if (i >= MAX_SKB_FRAGS) {
171 pr_debug("%s: packet too long %d\n", dev->name,
172 len);
173 dev->stats.rx_length_errors++;
174 goto drop;
175 }
176
177 nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
178 if (!nskb) {
179 pr_debug("%s: rx error: %d buffers missing\n",
180 dev->name, hdr->mhdr.num_buffers);
181 dev->stats.rx_length_errors++;
182 goto drop;
183 }
184
185 __skb_unlink(nskb, &vi->recv);
186 vi->num--;
187
188 skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0];
189 skb_shinfo(nskb)->nr_frags = 0;
190 kfree_skb(nskb);
191
192 if (len > PAGE_SIZE)
193 len = PAGE_SIZE;
194
195 skb_shinfo(skb)->frags[i].size = len;
196 skb_shinfo(skb)->nr_frags++;
197 skb->data_len += len;
198 skb->len += len;
199 }
200 } else {
201 len -= sizeof(hdr->hdr);
202
203 if (len <= MAX_PACKET_LEN)
204 trim_pages(vi, skb);
205
206 err = pskb_trim(skb, len);
207 if (err) {
208 pr_debug("%s: pskb_trim failed %i %d\n", dev->name,
209 len, err);
210 dev->stats.rx_dropped++;
211 goto drop;
212 }
213 }
214
215 skb->truesize += skb->data_len;
216 dev->stats.rx_bytes += skb->len;
217 dev->stats.rx_packets++;
218
219 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
220 pr_debug("Needs csum!\n");
221 if (!skb_partial_csum_set(skb,
222 hdr->hdr.csum_start,
223 hdr->hdr.csum_offset))
224 goto frame_err;
225 }
226
227 skb->protocol = eth_type_trans(skb, dev);
228 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
229 ntohs(skb->protocol), skb->len, skb->pkt_type);
230
231 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
232 pr_debug("GSO!\n");
233 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
234 case VIRTIO_NET_HDR_GSO_TCPV4:
235 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
236 break;
237 case VIRTIO_NET_HDR_GSO_UDP:
238 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
239 break;
240 case VIRTIO_NET_HDR_GSO_TCPV6:
241 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
242 break;
243 default:
244 if (net_ratelimit())
245 printk(KERN_WARNING "%s: bad gso type %u.\n",
246 dev->name, hdr->hdr.gso_type);
247 goto frame_err;
248 }
249
250 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
251 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
252
253 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
254 if (skb_shinfo(skb)->gso_size == 0) {
255 if (net_ratelimit())
256 printk(KERN_WARNING "%s: zero gso size.\n",
257 dev->name);
258 goto frame_err;
259 }
260
261 /* Header must be checked, and gso_segs computed. */
262 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
263 skb_shinfo(skb)->gso_segs = 0;
264 }
265
266 netif_receive_skb(skb);
267 return;
268
269 frame_err:
270 dev->stats.rx_frame_errors++;
271 drop:
272 dev_kfree_skb(skb);
273 }
274
275 static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
276 {
277 struct sk_buff *skb;
278 struct scatterlist sg[2+MAX_SKB_FRAGS];
279 int num, err, i;
280 bool oom = false;
281
282 sg_init_table(sg, 2+MAX_SKB_FRAGS);
283 do {
284 struct skb_vnet_hdr *hdr;
285
286 skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN);
287 if (unlikely(!skb)) {
288 oom = true;
289 break;
290 }
291
292 skb_reserve(skb, NET_IP_ALIGN);
293 skb_put(skb, MAX_PACKET_LEN);
294
295 hdr = skb_vnet_hdr(skb);
296 sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
297
298 if (vi->big_packets) {
299 for (i = 0; i < MAX_SKB_FRAGS; i++) {
300 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
301 f->page = get_a_page(vi, gfp);
302 if (!f->page)
303 break;
304
305 f->page_offset = 0;
306 f->size = PAGE_SIZE;
307
308 skb->data_len += PAGE_SIZE;
309 skb->len += PAGE_SIZE;
310
311 skb_shinfo(skb)->nr_frags++;
312 }
313 }
314
315 num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
316 skb_queue_head(&vi->recv, skb);
317
318 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
319 if (err < 0) {
320 skb_unlink(skb, &vi->recv);
321 trim_pages(vi, skb);
322 kfree_skb(skb);
323 break;
324 }
325 vi->num++;
326 } while (err >= num);
327 if (unlikely(vi->num > vi->max))
328 vi->max = vi->num;
329 vi->rvq->vq_ops->kick(vi->rvq);
330 return !oom;
331 }
332
333 /* Returns false if we couldn't fill entirely (OOM). */
334 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
335 {
336 struct sk_buff *skb;
337 struct scatterlist sg[1];
338 int err;
339 bool oom = false;
340
341 if (!vi->mergeable_rx_bufs)
342 return try_fill_recv_maxbufs(vi, gfp);
343
344 do {
345 skb_frag_t *f;
346
347 skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN);
348 if (unlikely(!skb)) {
349 oom = true;
350 break;
351 }
352
353 skb_reserve(skb, NET_IP_ALIGN);
354
355 f = &skb_shinfo(skb)->frags[0];
356 f->page = get_a_page(vi, gfp);
357 if (!f->page) {
358 oom = true;
359 kfree_skb(skb);
360 break;
361 }
362
363 f->page_offset = 0;
364 f->size = PAGE_SIZE;
365
366 skb_shinfo(skb)->nr_frags++;
367
368 sg_init_one(sg, page_address(f->page), PAGE_SIZE);
369 skb_queue_head(&vi->recv, skb);
370
371 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb);
372 if (err < 0) {
373 skb_unlink(skb, &vi->recv);
374 kfree_skb(skb);
375 break;
376 }
377 vi->num++;
378 } while (err > 0);
379 if (unlikely(vi->num > vi->max))
380 vi->max = vi->num;
381 vi->rvq->vq_ops->kick(vi->rvq);
382 return !oom;
383 }
384
385 static void skb_recv_done(struct virtqueue *rvq)
386 {
387 struct virtnet_info *vi = rvq->vdev->priv;
388 /* Schedule NAPI, Suppress further interrupts if successful. */
389 if (napi_schedule_prep(&vi->napi)) {
390 rvq->vq_ops->disable_cb(rvq);
391 __napi_schedule(&vi->napi);
392 }
393 }
394
395 static void refill_work(struct work_struct *work)
396 {
397 struct virtnet_info *vi;
398 bool still_empty;
399
400 vi = container_of(work, struct virtnet_info, refill.work);
401 napi_disable(&vi->napi);
402 try_fill_recv(vi, GFP_KERNEL);
403 still_empty = (vi->num == 0);
404 napi_enable(&vi->napi);
405
406 /* In theory, this can happen: if we don't get any buffers in
407 * we will *never* try to fill again. */
408 if (still_empty)
409 schedule_delayed_work(&vi->refill, HZ/2);
410 }
411
412 static int virtnet_poll(struct napi_struct *napi, int budget)
413 {
414 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
415 struct sk_buff *skb = NULL;
416 unsigned int len, received = 0;
417
418 again:
419 while (received < budget &&
420 (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
421 __skb_unlink(skb, &vi->recv);
422 receive_skb(vi->dev, skb, len);
423 vi->num--;
424 received++;
425 }
426
427 if (vi->num < vi->max / 2) {
428 if (!try_fill_recv(vi, GFP_ATOMIC))
429 schedule_delayed_work(&vi->refill, 0);
430 }
431
432 /* Out of packets? */
433 if (received < budget) {
434 napi_complete(napi);
435 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq))
436 && napi_schedule_prep(napi)) {
437 vi->rvq->vq_ops->disable_cb(vi->rvq);
438 __napi_schedule(napi);
439 goto again;
440 }
441 }
442
443 return received;
444 }
445
446 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
447 {
448 struct sk_buff *skb;
449 unsigned int len, tot_sgs = 0;
450
451 while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
452 pr_debug("Sent skb %p\n", skb);
453 __skb_unlink(skb, &vi->send);
454 vi->dev->stats.tx_bytes += skb->len;
455 vi->dev->stats.tx_packets++;
456 tot_sgs += skb_vnet_hdr(skb)->num_sg;
457 kfree_skb(skb);
458 }
459 return tot_sgs;
460 }
461
462 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
463 {
464 struct scatterlist sg[2+MAX_SKB_FRAGS];
465 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
466 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
467
468 sg_init_table(sg, 2+MAX_SKB_FRAGS);
469
470 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
471
472 if (skb->ip_summed == CHECKSUM_PARTIAL) {
473 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
474 hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
475 hdr->hdr.csum_offset = skb->csum_offset;
476 } else {
477 hdr->hdr.flags = 0;
478 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
479 }
480
481 if (skb_is_gso(skb)) {
482 hdr->hdr.hdr_len = skb_headlen(skb);
483 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
484 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
485 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
486 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
487 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
488 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
489 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
490 else
491 BUG();
492 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
493 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
494 } else {
495 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
496 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
497 }
498
499 hdr->mhdr.num_buffers = 0;
500
501 /* Encode metadata header at front. */
502 if (vi->mergeable_rx_bufs)
503 sg_set_buf(sg, &hdr->mhdr, sizeof(hdr->mhdr));
504 else
505 sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
506
507 hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
508 return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
509 }
510
511 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
512 {
513 struct virtnet_info *vi = netdev_priv(dev);
514 int capacity;
515
516 again:
517 /* Free up any pending old buffers before queueing new ones. */
518 free_old_xmit_skbs(vi);
519
520 /* Put new one in send queue and do transmit */
521 __skb_queue_head(&vi->send, skb);
522 capacity = xmit_skb(vi, skb);
523
524 /* This can happen with OOM and indirect buffers. */
525 if (unlikely(capacity < 0)) {
526 netif_stop_queue(dev);
527 dev_warn(&dev->dev, "Unexpected full queue\n");
528 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
529 vi->svq->vq_ops->disable_cb(vi->svq);
530 netif_start_queue(dev);
531 goto again;
532 }
533 return NETDEV_TX_BUSY;
534 }
535
536 vi->svq->vq_ops->kick(vi->svq);
537 /* Don't wait up for transmitted skbs to be freed. */
538 skb_orphan(skb);
539 nf_reset(skb);
540
541 /* Apparently nice girls don't return TX_BUSY; stop the queue
542 * before it gets out of hand. Naturally, this wastes entries. */
543 if (capacity < 2+MAX_SKB_FRAGS) {
544 netif_stop_queue(dev);
545 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
546 /* More just got used, free them then recheck. */
547 capacity += free_old_xmit_skbs(vi);
548 if (capacity >= 2+MAX_SKB_FRAGS) {
549 netif_start_queue(dev);
550 vi->svq->vq_ops->disable_cb(vi->svq);
551 }
552 }
553 }
554
555 return NETDEV_TX_OK;
556 }
557
558 static int virtnet_set_mac_address(struct net_device *dev, void *p)
559 {
560 struct virtnet_info *vi = netdev_priv(dev);
561 struct virtio_device *vdev = vi->vdev;
562 int ret;
563
564 ret = eth_mac_addr(dev, p);
565 if (ret)
566 return ret;
567
568 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
569 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
570 dev->dev_addr, dev->addr_len);
571
572 return 0;
573 }
574
575 #ifdef CONFIG_NET_POLL_CONTROLLER
576 static void virtnet_netpoll(struct net_device *dev)
577 {
578 struct virtnet_info *vi = netdev_priv(dev);
579
580 napi_schedule(&vi->napi);
581 }
582 #endif
583
584 static int virtnet_open(struct net_device *dev)
585 {
586 struct virtnet_info *vi = netdev_priv(dev);
587
588 napi_enable(&vi->napi);
589
590 /* If all buffers were filled by other side before we napi_enabled, we
591 * won't get another interrupt, so process any outstanding packets
592 * now. virtnet_poll wants re-enable the queue, so we disable here.
593 * We synchronize against interrupts via NAPI_STATE_SCHED */
594 if (napi_schedule_prep(&vi->napi)) {
595 vi->rvq->vq_ops->disable_cb(vi->rvq);
596 __napi_schedule(&vi->napi);
597 }
598 return 0;
599 }
600
601 /*
602 * Send command via the control virtqueue and check status. Commands
603 * supported by the hypervisor, as indicated by feature bits, should
604 * never fail unless improperly formated.
605 */
606 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
607 struct scatterlist *data, int out, int in)
608 {
609 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
610 struct virtio_net_ctrl_hdr ctrl;
611 virtio_net_ctrl_ack status = ~0;
612 unsigned int tmp;
613 int i;
614
615 /* Caller should know better */
616 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
617 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
618
619 out++; /* Add header */
620 in++; /* Add return status */
621
622 ctrl.class = class;
623 ctrl.cmd = cmd;
624
625 sg_init_table(sg, out + in);
626
627 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
628 for_each_sg(data, s, out + in - 2, i)
629 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
630 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
631
632 BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
633
634 vi->cvq->vq_ops->kick(vi->cvq);
635
636 /*
637 * Spin for a response, the kick causes an ioport write, trapping
638 * into the hypervisor, so the request should be handled immediately.
639 */
640 while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp))
641 cpu_relax();
642
643 return status == VIRTIO_NET_OK;
644 }
645
646 static int virtnet_close(struct net_device *dev)
647 {
648 struct virtnet_info *vi = netdev_priv(dev);
649
650 napi_disable(&vi->napi);
651
652 return 0;
653 }
654
655 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
656 {
657 struct virtnet_info *vi = netdev_priv(dev);
658 struct virtio_device *vdev = vi->vdev;
659
660 if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
661 return -ENOSYS;
662
663 return ethtool_op_set_tx_hw_csum(dev, data);
664 }
665
666 static void virtnet_set_rx_mode(struct net_device *dev)
667 {
668 struct virtnet_info *vi = netdev_priv(dev);
669 struct scatterlist sg[2];
670 u8 promisc, allmulti;
671 struct virtio_net_ctrl_mac *mac_data;
672 struct dev_addr_list *addr;
673 struct netdev_hw_addr *ha;
674 void *buf;
675 int i;
676
677 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
678 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
679 return;
680
681 promisc = ((dev->flags & IFF_PROMISC) != 0);
682 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
683
684 sg_init_one(sg, &promisc, sizeof(promisc));
685
686 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
687 VIRTIO_NET_CTRL_RX_PROMISC,
688 sg, 1, 0))
689 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
690 promisc ? "en" : "dis");
691
692 sg_init_one(sg, &allmulti, sizeof(allmulti));
693
694 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
695 VIRTIO_NET_CTRL_RX_ALLMULTI,
696 sg, 1, 0))
697 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
698 allmulti ? "en" : "dis");
699
700 /* MAC filter - use one buffer for both lists */
701 mac_data = buf = kzalloc(((dev->uc.count + dev->mc_count) * ETH_ALEN) +
702 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
703 if (!buf) {
704 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
705 return;
706 }
707
708 sg_init_table(sg, 2);
709
710 /* Store the unicast list and count in the front of the buffer */
711 mac_data->entries = dev->uc.count;
712 i = 0;
713 list_for_each_entry(ha, &dev->uc.list, list)
714 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
715
716 sg_set_buf(&sg[0], mac_data,
717 sizeof(mac_data->entries) + (dev->uc.count * ETH_ALEN));
718
719 /* multicast list and count fill the end */
720 mac_data = (void *)&mac_data->macs[dev->uc.count][0];
721
722 mac_data->entries = dev->mc_count;
723 addr = dev->mc_list;
724 for (i = 0; i < dev->mc_count; i++, addr = addr->next)
725 memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN);
726
727 sg_set_buf(&sg[1], mac_data,
728 sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN));
729
730 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
731 VIRTIO_NET_CTRL_MAC_TABLE_SET,
732 sg, 2, 0))
733 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
734
735 kfree(buf);
736 }
737
738 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
739 {
740 struct virtnet_info *vi = netdev_priv(dev);
741 struct scatterlist sg;
742
743 sg_init_one(&sg, &vid, sizeof(vid));
744
745 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
746 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
747 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
748 }
749
750 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
751 {
752 struct virtnet_info *vi = netdev_priv(dev);
753 struct scatterlist sg;
754
755 sg_init_one(&sg, &vid, sizeof(vid));
756
757 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
758 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
759 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
760 }
761
762 static const struct ethtool_ops virtnet_ethtool_ops = {
763 .set_tx_csum = virtnet_set_tx_csum,
764 .set_sg = ethtool_op_set_sg,
765 .set_tso = ethtool_op_set_tso,
766 .set_ufo = ethtool_op_set_ufo,
767 .get_link = ethtool_op_get_link,
768 };
769
770 #define MIN_MTU 68
771 #define MAX_MTU 65535
772
773 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
774 {
775 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
776 return -EINVAL;
777 dev->mtu = new_mtu;
778 return 0;
779 }
780
781 static const struct net_device_ops virtnet_netdev = {
782 .ndo_open = virtnet_open,
783 .ndo_stop = virtnet_close,
784 .ndo_start_xmit = start_xmit,
785 .ndo_validate_addr = eth_validate_addr,
786 .ndo_set_mac_address = virtnet_set_mac_address,
787 .ndo_set_rx_mode = virtnet_set_rx_mode,
788 .ndo_change_mtu = virtnet_change_mtu,
789 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
790 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
791 #ifdef CONFIG_NET_POLL_CONTROLLER
792 .ndo_poll_controller = virtnet_netpoll,
793 #endif
794 };
795
796 static void virtnet_update_status(struct virtnet_info *vi)
797 {
798 u16 v;
799
800 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
801 return;
802
803 vi->vdev->config->get(vi->vdev,
804 offsetof(struct virtio_net_config, status),
805 &v, sizeof(v));
806
807 /* Ignore unknown (future) status bits */
808 v &= VIRTIO_NET_S_LINK_UP;
809
810 if (vi->status == v)
811 return;
812
813 vi->status = v;
814
815 if (vi->status & VIRTIO_NET_S_LINK_UP) {
816 netif_carrier_on(vi->dev);
817 netif_wake_queue(vi->dev);
818 } else {
819 netif_carrier_off(vi->dev);
820 netif_stop_queue(vi->dev);
821 }
822 }
823
824 static void virtnet_config_changed(struct virtio_device *vdev)
825 {
826 struct virtnet_info *vi = vdev->priv;
827
828 virtnet_update_status(vi);
829 }
830
831 static int virtnet_probe(struct virtio_device *vdev)
832 {
833 int err;
834 struct net_device *dev;
835 struct virtnet_info *vi;
836 struct virtqueue *vqs[3];
837 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
838 const char *names[] = { "input", "output", "control" };
839 int nvqs;
840
841 /* Allocate ourselves a network device with room for our info */
842 dev = alloc_etherdev(sizeof(struct virtnet_info));
843 if (!dev)
844 return -ENOMEM;
845
846 /* Set up network device as normal. */
847 dev->netdev_ops = &virtnet_netdev;
848 dev->features = NETIF_F_HIGHDMA;
849 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
850 SET_NETDEV_DEV(dev, &vdev->dev);
851
852 /* Do we support "hardware" checksums? */
853 if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
854 /* This opens up the world of extra features. */
855 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
856 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
857 dev->features |= NETIF_F_TSO | NETIF_F_UFO
858 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
859 }
860 /* Individual feature bits: what can host handle? */
861 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
862 dev->features |= NETIF_F_TSO;
863 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
864 dev->features |= NETIF_F_TSO6;
865 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
866 dev->features |= NETIF_F_TSO_ECN;
867 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
868 dev->features |= NETIF_F_UFO;
869 }
870
871 /* Configuration may specify what MAC to use. Otherwise random. */
872 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
873 vdev->config->get(vdev,
874 offsetof(struct virtio_net_config, mac),
875 dev->dev_addr, dev->addr_len);
876 } else
877 random_ether_addr(dev->dev_addr);
878
879 /* Set up our device-specific information */
880 vi = netdev_priv(dev);
881 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
882 vi->dev = dev;
883 vi->vdev = vdev;
884 vdev->priv = vi;
885 vi->pages = NULL;
886 INIT_DELAYED_WORK(&vi->refill, refill_work);
887
888 /* If we can receive ANY GSO packets, we must allocate large ones. */
889 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
890 || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
891 || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
892 vi->big_packets = true;
893
894 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
895 vi->mergeable_rx_bufs = true;
896
897 /* We expect two virtqueues, receive then send,
898 * and optionally control. */
899 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
900
901 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
902 if (err)
903 goto free;
904
905 vi->rvq = vqs[0];
906 vi->svq = vqs[1];
907
908 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
909 vi->cvq = vqs[2];
910
911 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
912 dev->features |= NETIF_F_HW_VLAN_FILTER;
913 }
914
915 /* Initialize our empty receive and send queues. */
916 skb_queue_head_init(&vi->recv);
917 skb_queue_head_init(&vi->send);
918
919 err = register_netdev(dev);
920 if (err) {
921 pr_debug("virtio_net: registering device failed\n");
922 goto free_vqs;
923 }
924
925 /* Last of all, set up some receive buffers. */
926 try_fill_recv(vi, GFP_KERNEL);
927
928 /* If we didn't even get one input buffer, we're useless. */
929 if (vi->num == 0) {
930 err = -ENOMEM;
931 goto unregister;
932 }
933
934 vi->status = VIRTIO_NET_S_LINK_UP;
935 virtnet_update_status(vi);
936 netif_carrier_on(dev);
937
938 pr_debug("virtnet: registered device %s\n", dev->name);
939 return 0;
940
941 unregister:
942 unregister_netdev(dev);
943 cancel_delayed_work_sync(&vi->refill);
944 free_vqs:
945 vdev->config->del_vqs(vdev);
946 free:
947 free_netdev(dev);
948 return err;
949 }
950
951 static void __devexit virtnet_remove(struct virtio_device *vdev)
952 {
953 struct virtnet_info *vi = vdev->priv;
954 struct sk_buff *skb;
955
956 /* Stop all the virtqueues. */
957 vdev->config->reset(vdev);
958
959 /* Free our skbs in send and recv queues, if any. */
960 while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
961 kfree_skb(skb);
962 vi->num--;
963 }
964 __skb_queue_purge(&vi->send);
965
966 BUG_ON(vi->num != 0);
967
968 unregister_netdev(vi->dev);
969 cancel_delayed_work_sync(&vi->refill);
970
971 vdev->config->del_vqs(vi->vdev);
972
973 while (vi->pages)
974 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
975
976 free_netdev(vi->dev);
977 }
978
979 static struct virtio_device_id id_table[] = {
980 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
981 { 0 },
982 };
983
984 static unsigned int features[] = {
985 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
986 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
987 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
988 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
989 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
990 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
991 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
992 };
993
994 static struct virtio_driver virtio_net = {
995 .feature_table = features,
996 .feature_table_size = ARRAY_SIZE(features),
997 .driver.name = KBUILD_MODNAME,
998 .driver.owner = THIS_MODULE,
999 .id_table = id_table,
1000 .probe = virtnet_probe,
1001 .remove = __devexit_p(virtnet_remove),
1002 .config_changed = virtnet_config_changed,
1003 };
1004
1005 static int __init init(void)
1006 {
1007 return register_virtio_driver(&virtio_net);
1008 }
1009
1010 static void __exit fini(void)
1011 {
1012 unregister_virtio_driver(&virtio_net);
1013 }
1014 module_init(init);
1015 module_exit(fini);
1016
1017 MODULE_DEVICE_TABLE(virtio, id_table);
1018 MODULE_DESCRIPTION("Virtio network driver");
1019 MODULE_LICENSE("GPL");
Linux for Ginger Game Console