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net: Use netdev_alloc_skb_ip_align()
[deliverable/linux.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_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_ip_align(vi->dev, MAX_PACKET_LEN);
287 if (unlikely(!skb)) {
288 oom = true;
289 break;
290 }
291
292 skb_put(skb, MAX_PACKET_LEN);
293
294 hdr = skb_vnet_hdr(skb);
295 sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
296
297 if (vi->big_packets) {
298 for (i = 0; i < MAX_SKB_FRAGS; i++) {
299 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
300 f->page = get_a_page(vi, gfp);
301 if (!f->page)
302 break;
303
304 f->page_offset = 0;
305 f->size = PAGE_SIZE;
306
307 skb->data_len += PAGE_SIZE;
308 skb->len += PAGE_SIZE;
309
310 skb_shinfo(skb)->nr_frags++;
311 }
312 }
313
314 num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
315 skb_queue_head(&vi->recv, skb);
316
317 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
318 if (err < 0) {
319 skb_unlink(skb, &vi->recv);
320 trim_pages(vi, skb);
321 kfree_skb(skb);
322 break;
323 }
324 vi->num++;
325 } while (err >= num);
326 if (unlikely(vi->num > vi->max))
327 vi->max = vi->num;
328 vi->rvq->vq_ops->kick(vi->rvq);
329 return !oom;
330 }
331
332 /* Returns false if we couldn't fill entirely (OOM). */
333 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
334 {
335 struct sk_buff *skb;
336 struct scatterlist sg[1];
337 int err;
338 bool oom = false;
339
340 if (!vi->mergeable_rx_bufs)
341 return try_fill_recv_maxbufs(vi, gfp);
342
343 do {
344 skb_frag_t *f;
345
346 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
347 if (unlikely(!skb)) {
348 oom = true;
349 break;
350 }
351
352 f = &skb_shinfo(skb)->frags[0];
353 f->page = get_a_page(vi, gfp);
354 if (!f->page) {
355 oom = true;
356 kfree_skb(skb);
357 break;
358 }
359
360 f->page_offset = 0;
361 f->size = PAGE_SIZE;
362
363 skb_shinfo(skb)->nr_frags++;
364
365 sg_init_one(sg, page_address(f->page), PAGE_SIZE);
366 skb_queue_head(&vi->recv, skb);
367
368 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb);
369 if (err < 0) {
370 skb_unlink(skb, &vi->recv);
371 kfree_skb(skb);
372 break;
373 }
374 vi->num++;
375 } while (err > 0);
376 if (unlikely(vi->num > vi->max))
377 vi->max = vi->num;
378 vi->rvq->vq_ops->kick(vi->rvq);
379 return !oom;
380 }
381
382 static void skb_recv_done(struct virtqueue *rvq)
383 {
384 struct virtnet_info *vi = rvq->vdev->priv;
385 /* Schedule NAPI, Suppress further interrupts if successful. */
386 if (napi_schedule_prep(&vi->napi)) {
387 rvq->vq_ops->disable_cb(rvq);
388 __napi_schedule(&vi->napi);
389 }
390 }
391
392 static void refill_work(struct work_struct *work)
393 {
394 struct virtnet_info *vi;
395 bool still_empty;
396
397 vi = container_of(work, struct virtnet_info, refill.work);
398 napi_disable(&vi->napi);
399 try_fill_recv(vi, GFP_KERNEL);
400 still_empty = (vi->num == 0);
401 napi_enable(&vi->napi);
402
403 /* In theory, this can happen: if we don't get any buffers in
404 * we will *never* try to fill again. */
405 if (still_empty)
406 schedule_delayed_work(&vi->refill, HZ/2);
407 }
408
409 static int virtnet_poll(struct napi_struct *napi, int budget)
410 {
411 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
412 struct sk_buff *skb = NULL;
413 unsigned int len, received = 0;
414
415 again:
416 while (received < budget &&
417 (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
418 __skb_unlink(skb, &vi->recv);
419 receive_skb(vi->dev, skb, len);
420 vi->num--;
421 received++;
422 }
423
424 if (vi->num < vi->max / 2) {
425 if (!try_fill_recv(vi, GFP_ATOMIC))
426 schedule_delayed_work(&vi->refill, 0);
427 }
428
429 /* Out of packets? */
430 if (received < budget) {
431 napi_complete(napi);
432 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq))
433 && napi_schedule_prep(napi)) {
434 vi->rvq->vq_ops->disable_cb(vi->rvq);
435 __napi_schedule(napi);
436 goto again;
437 }
438 }
439
440 return received;
441 }
442
443 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
444 {
445 struct sk_buff *skb;
446 unsigned int len, tot_sgs = 0;
447
448 while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
449 pr_debug("Sent skb %p\n", skb);
450 __skb_unlink(skb, &vi->send);
451 vi->dev->stats.tx_bytes += skb->len;
452 vi->dev->stats.tx_packets++;
453 tot_sgs += skb_vnet_hdr(skb)->num_sg;
454 kfree_skb(skb);
455 }
456 return tot_sgs;
457 }
458
459 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
460 {
461 struct scatterlist sg[2+MAX_SKB_FRAGS];
462 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
463 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
464
465 sg_init_table(sg, 2+MAX_SKB_FRAGS);
466
467 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
468
469 if (skb->ip_summed == CHECKSUM_PARTIAL) {
470 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
471 hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
472 hdr->hdr.csum_offset = skb->csum_offset;
473 } else {
474 hdr->hdr.flags = 0;
475 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
476 }
477
478 if (skb_is_gso(skb)) {
479 hdr->hdr.hdr_len = skb_headlen(skb);
480 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
481 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
482 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
483 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
484 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
485 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
486 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
487 else
488 BUG();
489 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
490 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
491 } else {
492 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
493 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
494 }
495
496 hdr->mhdr.num_buffers = 0;
497
498 /* Encode metadata header at front. */
499 if (vi->mergeable_rx_bufs)
500 sg_set_buf(sg, &hdr->mhdr, sizeof(hdr->mhdr));
501 else
502 sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
503
504 hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
505 return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
506 }
507
508 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
509 {
510 struct virtnet_info *vi = netdev_priv(dev);
511 int capacity;
512
513 again:
514 /* Free up any pending old buffers before queueing new ones. */
515 free_old_xmit_skbs(vi);
516
517 /* Put new one in send queue and do transmit */
518 __skb_queue_head(&vi->send, skb);
519 capacity = xmit_skb(vi, skb);
520
521 /* This can happen with OOM and indirect buffers. */
522 if (unlikely(capacity < 0)) {
523 netif_stop_queue(dev);
524 dev_warn(&dev->dev, "Unexpected full queue\n");
525 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
526 vi->svq->vq_ops->disable_cb(vi->svq);
527 netif_start_queue(dev);
528 goto again;
529 }
530 return NETDEV_TX_BUSY;
531 }
532
533 vi->svq->vq_ops->kick(vi->svq);
534 /* Don't wait up for transmitted skbs to be freed. */
535 skb_orphan(skb);
536 nf_reset(skb);
537
538 /* Apparently nice girls don't return TX_BUSY; stop the queue
539 * before it gets out of hand. Naturally, this wastes entries. */
540 if (capacity < 2+MAX_SKB_FRAGS) {
541 netif_stop_queue(dev);
542 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
543 /* More just got used, free them then recheck. */
544 capacity += free_old_xmit_skbs(vi);
545 if (capacity >= 2+MAX_SKB_FRAGS) {
546 netif_start_queue(dev);
547 vi->svq->vq_ops->disable_cb(vi->svq);
548 }
549 }
550 }
551
552 return NETDEV_TX_OK;
553 }
554
555 static int virtnet_set_mac_address(struct net_device *dev, void *p)
556 {
557 struct virtnet_info *vi = netdev_priv(dev);
558 struct virtio_device *vdev = vi->vdev;
559 int ret;
560
561 ret = eth_mac_addr(dev, p);
562 if (ret)
563 return ret;
564
565 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
566 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
567 dev->dev_addr, dev->addr_len);
568
569 return 0;
570 }
571
572 #ifdef CONFIG_NET_POLL_CONTROLLER
573 static void virtnet_netpoll(struct net_device *dev)
574 {
575 struct virtnet_info *vi = netdev_priv(dev);
576
577 napi_schedule(&vi->napi);
578 }
579 #endif
580
581 static int virtnet_open(struct net_device *dev)
582 {
583 struct virtnet_info *vi = netdev_priv(dev);
584
585 napi_enable(&vi->napi);
586
587 /* If all buffers were filled by other side before we napi_enabled, we
588 * won't get another interrupt, so process any outstanding packets
589 * now. virtnet_poll wants re-enable the queue, so we disable here.
590 * We synchronize against interrupts via NAPI_STATE_SCHED */
591 if (napi_schedule_prep(&vi->napi)) {
592 vi->rvq->vq_ops->disable_cb(vi->rvq);
593 __napi_schedule(&vi->napi);
594 }
595 return 0;
596 }
597
598 /*
599 * Send command via the control virtqueue and check status. Commands
600 * supported by the hypervisor, as indicated by feature bits, should
601 * never fail unless improperly formated.
602 */
603 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
604 struct scatterlist *data, int out, int in)
605 {
606 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
607 struct virtio_net_ctrl_hdr ctrl;
608 virtio_net_ctrl_ack status = ~0;
609 unsigned int tmp;
610 int i;
611
612 /* Caller should know better */
613 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
614 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
615
616 out++; /* Add header */
617 in++; /* Add return status */
618
619 ctrl.class = class;
620 ctrl.cmd = cmd;
621
622 sg_init_table(sg, out + in);
623
624 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
625 for_each_sg(data, s, out + in - 2, i)
626 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
627 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
628
629 BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
630
631 vi->cvq->vq_ops->kick(vi->cvq);
632
633 /*
634 * Spin for a response, the kick causes an ioport write, trapping
635 * into the hypervisor, so the request should be handled immediately.
636 */
637 while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp))
638 cpu_relax();
639
640 return status == VIRTIO_NET_OK;
641 }
642
643 static int virtnet_close(struct net_device *dev)
644 {
645 struct virtnet_info *vi = netdev_priv(dev);
646
647 napi_disable(&vi->napi);
648
649 return 0;
650 }
651
652 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
653 {
654 struct virtnet_info *vi = netdev_priv(dev);
655 struct virtio_device *vdev = vi->vdev;
656
657 if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
658 return -ENOSYS;
659
660 return ethtool_op_set_tx_hw_csum(dev, data);
661 }
662
663 static void virtnet_set_rx_mode(struct net_device *dev)
664 {
665 struct virtnet_info *vi = netdev_priv(dev);
666 struct scatterlist sg[2];
667 u8 promisc, allmulti;
668 struct virtio_net_ctrl_mac *mac_data;
669 struct dev_addr_list *addr;
670 struct netdev_hw_addr *ha;
671 void *buf;
672 int i;
673
674 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
675 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
676 return;
677
678 promisc = ((dev->flags & IFF_PROMISC) != 0);
679 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
680
681 sg_init_one(sg, &promisc, sizeof(promisc));
682
683 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
684 VIRTIO_NET_CTRL_RX_PROMISC,
685 sg, 1, 0))
686 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
687 promisc ? "en" : "dis");
688
689 sg_init_one(sg, &allmulti, sizeof(allmulti));
690
691 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
692 VIRTIO_NET_CTRL_RX_ALLMULTI,
693 sg, 1, 0))
694 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
695 allmulti ? "en" : "dis");
696
697 /* MAC filter - use one buffer for both lists */
698 mac_data = buf = kzalloc(((dev->uc.count + dev->mc_count) * ETH_ALEN) +
699 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
700 if (!buf) {
701 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
702 return;
703 }
704
705 sg_init_table(sg, 2);
706
707 /* Store the unicast list and count in the front of the buffer */
708 mac_data->entries = dev->uc.count;
709 i = 0;
710 list_for_each_entry(ha, &dev->uc.list, list)
711 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
712
713 sg_set_buf(&sg[0], mac_data,
714 sizeof(mac_data->entries) + (dev->uc.count * ETH_ALEN));
715
716 /* multicast list and count fill the end */
717 mac_data = (void *)&mac_data->macs[dev->uc.count][0];
718
719 mac_data->entries = dev->mc_count;
720 addr = dev->mc_list;
721 for (i = 0; i < dev->mc_count; i++, addr = addr->next)
722 memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN);
723
724 sg_set_buf(&sg[1], mac_data,
725 sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN));
726
727 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
728 VIRTIO_NET_CTRL_MAC_TABLE_SET,
729 sg, 2, 0))
730 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
731
732 kfree(buf);
733 }
734
735 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
736 {
737 struct virtnet_info *vi = netdev_priv(dev);
738 struct scatterlist sg;
739
740 sg_init_one(&sg, &vid, sizeof(vid));
741
742 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
743 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
744 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
745 }
746
747 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
748 {
749 struct virtnet_info *vi = netdev_priv(dev);
750 struct scatterlist sg;
751
752 sg_init_one(&sg, &vid, sizeof(vid));
753
754 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
755 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
756 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
757 }
758
759 static const struct ethtool_ops virtnet_ethtool_ops = {
760 .set_tx_csum = virtnet_set_tx_csum,
761 .set_sg = ethtool_op_set_sg,
762 .set_tso = ethtool_op_set_tso,
763 .set_ufo = ethtool_op_set_ufo,
764 .get_link = ethtool_op_get_link,
765 };
766
767 #define MIN_MTU 68
768 #define MAX_MTU 65535
769
770 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
771 {
772 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
773 return -EINVAL;
774 dev->mtu = new_mtu;
775 return 0;
776 }
777
778 static const struct net_device_ops virtnet_netdev = {
779 .ndo_open = virtnet_open,
780 .ndo_stop = virtnet_close,
781 .ndo_start_xmit = start_xmit,
782 .ndo_validate_addr = eth_validate_addr,
783 .ndo_set_mac_address = virtnet_set_mac_address,
784 .ndo_set_rx_mode = virtnet_set_rx_mode,
785 .ndo_change_mtu = virtnet_change_mtu,
786 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
787 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
788 #ifdef CONFIG_NET_POLL_CONTROLLER
789 .ndo_poll_controller = virtnet_netpoll,
790 #endif
791 };
792
793 static void virtnet_update_status(struct virtnet_info *vi)
794 {
795 u16 v;
796
797 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
798 return;
799
800 vi->vdev->config->get(vi->vdev,
801 offsetof(struct virtio_net_config, status),
802 &v, sizeof(v));
803
804 /* Ignore unknown (future) status bits */
805 v &= VIRTIO_NET_S_LINK_UP;
806
807 if (vi->status == v)
808 return;
809
810 vi->status = v;
811
812 if (vi->status & VIRTIO_NET_S_LINK_UP) {
813 netif_carrier_on(vi->dev);
814 netif_wake_queue(vi->dev);
815 } else {
816 netif_carrier_off(vi->dev);
817 netif_stop_queue(vi->dev);
818 }
819 }
820
821 static void virtnet_config_changed(struct virtio_device *vdev)
822 {
823 struct virtnet_info *vi = vdev->priv;
824
825 virtnet_update_status(vi);
826 }
827
828 static int virtnet_probe(struct virtio_device *vdev)
829 {
830 int err;
831 struct net_device *dev;
832 struct virtnet_info *vi;
833 struct virtqueue *vqs[3];
834 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
835 const char *names[] = { "input", "output", "control" };
836 int nvqs;
837
838 /* Allocate ourselves a network device with room for our info */
839 dev = alloc_etherdev(sizeof(struct virtnet_info));
840 if (!dev)
841 return -ENOMEM;
842
843 /* Set up network device as normal. */
844 dev->netdev_ops = &virtnet_netdev;
845 dev->features = NETIF_F_HIGHDMA;
846 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
847 SET_NETDEV_DEV(dev, &vdev->dev);
848
849 /* Do we support "hardware" checksums? */
850 if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
851 /* This opens up the world of extra features. */
852 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
853 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
854 dev->features |= NETIF_F_TSO | NETIF_F_UFO
855 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
856 }
857 /* Individual feature bits: what can host handle? */
858 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
859 dev->features |= NETIF_F_TSO;
860 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
861 dev->features |= NETIF_F_TSO6;
862 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
863 dev->features |= NETIF_F_TSO_ECN;
864 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
865 dev->features |= NETIF_F_UFO;
866 }
867
868 /* Configuration may specify what MAC to use. Otherwise random. */
869 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
870 vdev->config->get(vdev,
871 offsetof(struct virtio_net_config, mac),
872 dev->dev_addr, dev->addr_len);
873 } else
874 random_ether_addr(dev->dev_addr);
875
876 /* Set up our device-specific information */
877 vi = netdev_priv(dev);
878 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
879 vi->dev = dev;
880 vi->vdev = vdev;
881 vdev->priv = vi;
882 vi->pages = NULL;
883 INIT_DELAYED_WORK(&vi->refill, refill_work);
884
885 /* If we can receive ANY GSO packets, we must allocate large ones. */
886 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
887 || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
888 || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
889 vi->big_packets = true;
890
891 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
892 vi->mergeable_rx_bufs = true;
893
894 /* We expect two virtqueues, receive then send,
895 * and optionally control. */
896 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
897
898 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
899 if (err)
900 goto free;
901
902 vi->rvq = vqs[0];
903 vi->svq = vqs[1];
904
905 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
906 vi->cvq = vqs[2];
907
908 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
909 dev->features |= NETIF_F_HW_VLAN_FILTER;
910 }
911
912 /* Initialize our empty receive and send queues. */
913 skb_queue_head_init(&vi->recv);
914 skb_queue_head_init(&vi->send);
915
916 err = register_netdev(dev);
917 if (err) {
918 pr_debug("virtio_net: registering device failed\n");
919 goto free_vqs;
920 }
921
922 /* Last of all, set up some receive buffers. */
923 try_fill_recv(vi, GFP_KERNEL);
924
925 /* If we didn't even get one input buffer, we're useless. */
926 if (vi->num == 0) {
927 err = -ENOMEM;
928 goto unregister;
929 }
930
931 vi->status = VIRTIO_NET_S_LINK_UP;
932 virtnet_update_status(vi);
933 netif_carrier_on(dev);
934
935 pr_debug("virtnet: registered device %s\n", dev->name);
936 return 0;
937
938 unregister:
939 unregister_netdev(dev);
940 cancel_delayed_work_sync(&vi->refill);
941 free_vqs:
942 vdev->config->del_vqs(vdev);
943 free:
944 free_netdev(dev);
945 return err;
946 }
947
948 static void __devexit virtnet_remove(struct virtio_device *vdev)
949 {
950 struct virtnet_info *vi = vdev->priv;
951 struct sk_buff *skb;
952
953 /* Stop all the virtqueues. */
954 vdev->config->reset(vdev);
955
956 /* Free our skbs in send and recv queues, if any. */
957 while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
958 kfree_skb(skb);
959 vi->num--;
960 }
961 __skb_queue_purge(&vi->send);
962
963 BUG_ON(vi->num != 0);
964
965 unregister_netdev(vi->dev);
966 cancel_delayed_work_sync(&vi->refill);
967
968 vdev->config->del_vqs(vi->vdev);
969
970 while (vi->pages)
971 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
972
973 free_netdev(vi->dev);
974 }
975
976 static struct virtio_device_id id_table[] = {
977 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
978 { 0 },
979 };
980
981 static unsigned int features[] = {
982 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
983 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
984 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
985 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
986 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
987 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
988 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
989 };
990
991 static struct virtio_driver virtio_net = {
992 .feature_table = features,
993 .feature_table_size = ARRAY_SIZE(features),
994 .driver.name = KBUILD_MODNAME,
995 .driver.owner = THIS_MODULE,
996 .id_table = id_table,
997 .probe = virtnet_probe,
998 .remove = __devexit_p(virtnet_remove),
999 .config_changed = virtnet_config_changed,
1000 };
1001
1002 static int __init init(void)
1003 {
1004 return register_virtio_driver(&virtio_net);
1005 }
1006
1007 static void __exit fini(void)
1008 {
1009 unregister_virtio_driver(&virtio_net);
1010 }
1011 module_init(init);
1012 module_exit(fini);
1013
1014 MODULE_DEVICE_TABLE(virtio, id_table);
1015 MODULE_DESCRIPTION("Virtio network driver");
1016 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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