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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / virtio_net.c
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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#include <linux/cpu.h>
30
31static int napi_weight = NAPI_POLL_WEIGHT;
32module_param(napi_weight, int, 0444);
33
34static bool csum = true, gso = true;
35module_param(csum, bool, 0444);
36module_param(gso, bool, 0444);
37
38/* FIXME: MTU in config. */
39#define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
40#define GOOD_COPY_LEN 128
41
42#define VIRTNET_DRIVER_VERSION "1.0.0"
43
44struct 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/* Internal representation of a send virtqueue */
55struct send_queue {
56 /* Virtqueue associated with this send _queue */
57 struct virtqueue *vq;
58
59 /* TX: fragments + linear part + virtio header */
60 struct scatterlist sg[MAX_SKB_FRAGS + 2];
61
62 /* Name of the send queue: output.$index */
63 char name[40];
64};
65
66/* Internal representation of a receive virtqueue */
67struct receive_queue {
68 /* Virtqueue associated with this receive_queue */
69 struct virtqueue *vq;
70
71 struct napi_struct napi;
72
73 /* Number of input buffers, and max we've ever had. */
74 unsigned int num, max;
75
76 /* Chain pages by the private ptr. */
77 struct page *pages;
78
79 /* RX: fragments + linear part + virtio header */
80 struct scatterlist sg[MAX_SKB_FRAGS + 2];
81
82 /* Name of this receive queue: input.$index */
83 char name[40];
84};
85
86struct virtnet_info {
87 struct virtio_device *vdev;
88 struct virtqueue *cvq;
89 struct net_device *dev;
90 struct send_queue *sq;
91 struct receive_queue *rq;
92 unsigned int status;
93
94 /* Max # of queue pairs supported by the device */
95 u16 max_queue_pairs;
96
97 /* # of queue pairs currently used by the driver */
98 u16 curr_queue_pairs;
99
100 /* I like... big packets and I cannot lie! */
101 bool big_packets;
102
103 /* Host will merge rx buffers for big packets (shake it! shake it!) */
104 bool mergeable_rx_bufs;
105
106 /* Has control virtqueue */
107 bool has_cvq;
108
109 /* enable config space updates */
110 bool config_enable;
111
112 /* Active statistics */
113 struct virtnet_stats __percpu *stats;
114
115 /* Work struct for refilling if we run low on memory. */
116 struct delayed_work refill;
117
118 /* Work struct for config space updates */
119 struct work_struct config_work;
120
121 /* Lock for config space updates */
122 struct mutex config_lock;
123
124 /* Does the affinity hint is set for virtqueues? */
125 bool affinity_hint_set;
126
127 /* Per-cpu variable to show the mapping from CPU to virtqueue */
128 int __percpu *vq_index;
129
130 /* CPU hot plug notifier */
131 struct notifier_block nb;
132};
133
134struct skb_vnet_hdr {
135 union {
136 struct virtio_net_hdr hdr;
137 struct virtio_net_hdr_mrg_rxbuf mhdr;
138 };
139};
140
141struct padded_vnet_hdr {
142 struct virtio_net_hdr hdr;
143 /*
144 * virtio_net_hdr should be in a separated sg buffer because of a
145 * QEMU bug, and data sg buffer shares same page with this header sg.
146 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
147 */
148 char padding[6];
149};
150
151/* Converting between virtqueue no. and kernel tx/rx queue no.
152 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
153 */
154static int vq2txq(struct virtqueue *vq)
155{
156 return (vq->index - 1) / 2;
157}
158
159static int txq2vq(int txq)
160{
161 return txq * 2 + 1;
162}
163
164static int vq2rxq(struct virtqueue *vq)
165{
166 return vq->index / 2;
167}
168
169static int rxq2vq(int rxq)
170{
171 return rxq * 2;
172}
173
174static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
175{
176 return (struct skb_vnet_hdr *)skb->cb;
177}
178
179/*
180 * private is used to chain pages for big packets, put the whole
181 * most recent used list in the beginning for reuse
182 */
183static void give_pages(struct receive_queue *rq, struct page *page)
184{
185 struct page *end;
186
187 /* Find end of list, sew whole thing into vi->rq.pages. */
188 for (end = page; end->private; end = (struct page *)end->private);
189 end->private = (unsigned long)rq->pages;
190 rq->pages = page;
191}
192
193static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
194{
195 struct page *p = rq->pages;
196
197 if (p) {
198 rq->pages = (struct page *)p->private;
199 /* clear private here, it is used to chain pages */
200 p->private = 0;
201 } else
202 p = alloc_page(gfp_mask);
203 return p;
204}
205
206static void skb_xmit_done(struct virtqueue *vq)
207{
208 struct virtnet_info *vi = vq->vdev->priv;
209
210 /* Suppress further interrupts. */
211 virtqueue_disable_cb(vq);
212
213 /* We were probably waiting for more output buffers. */
214 netif_wake_subqueue(vi->dev, vq2txq(vq));
215}
216
217static void set_skb_frag(struct sk_buff *skb, struct page *page,
218 unsigned int offset, unsigned int *len)
219{
220 int size = min((unsigned)PAGE_SIZE - offset, *len);
221 int i = skb_shinfo(skb)->nr_frags;
222
223 __skb_fill_page_desc(skb, i, page, offset, size);
224
225 skb->data_len += size;
226 skb->len += size;
227 skb->truesize += PAGE_SIZE;
228 skb_shinfo(skb)->nr_frags++;
229 skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
230 *len -= size;
231}
232
233/* Called from bottom half context */
234static struct sk_buff *page_to_skb(struct receive_queue *rq,
235 struct page *page, unsigned int len)
236{
237 struct virtnet_info *vi = rq->vq->vdev->priv;
238 struct sk_buff *skb;
239 struct skb_vnet_hdr *hdr;
240 unsigned int copy, hdr_len, offset;
241 char *p;
242
243 p = page_address(page);
244
245 /* copy small packet so we can reuse these pages for small data */
246 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
247 if (unlikely(!skb))
248 return NULL;
249
250 hdr = skb_vnet_hdr(skb);
251
252 if (vi->mergeable_rx_bufs) {
253 hdr_len = sizeof hdr->mhdr;
254 offset = hdr_len;
255 } else {
256 hdr_len = sizeof hdr->hdr;
257 offset = sizeof(struct padded_vnet_hdr);
258 }
259
260 memcpy(hdr, p, hdr_len);
261
262 len -= hdr_len;
263 p += offset;
264
265 copy = len;
266 if (copy > skb_tailroom(skb))
267 copy = skb_tailroom(skb);
268 memcpy(skb_put(skb, copy), p, copy);
269
270 len -= copy;
271 offset += copy;
272
273 /*
274 * Verify that we can indeed put this data into a skb.
275 * This is here to handle cases when the device erroneously
276 * tries to receive more than is possible. This is usually
277 * the case of a broken device.
278 */
279 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
280 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
281 dev_kfree_skb(skb);
282 return NULL;
283 }
284
285 while (len) {
286 set_skb_frag(skb, page, offset, &len);
287 page = (struct page *)page->private;
288 offset = 0;
289 }
290
291 if (page)
292 give_pages(rq, page);
293
294 return skb;
295}
296
297static struct sk_buff *receive_small(void *buf, unsigned int len)
298{
299 struct sk_buff * skb = buf;
300
301 len -= sizeof(struct virtio_net_hdr);
302 skb_trim(skb, len);
303
304 return skb;
305}
306
307static struct sk_buff *receive_big(struct net_device *dev,
308 struct receive_queue *rq,
309 void *buf)
310{
311 struct page *page = buf;
312 struct sk_buff *skb = page_to_skb(rq, page, 0);
313
314 if (unlikely(!skb))
315 goto err;
316
317 return skb;
318
319err:
320 dev->stats.rx_dropped++;
321 give_pages(rq, page);
322 return NULL;
323}
324
325static struct sk_buff *receive_mergeable(struct net_device *dev,
326 struct receive_queue *rq,
327 void *buf,
328 unsigned int len)
329{
330 struct skb_vnet_hdr *hdr = page_address(buf);
331 int num_buf = hdr->mhdr.num_buffers;
332 struct page *page = buf;
333 struct sk_buff *skb = page_to_skb(rq, page, len);
334 int i;
335
336 if (unlikely(!skb))
337 goto err_skb;
338
339 while (--num_buf) {
340 i = skb_shinfo(skb)->nr_frags;
341 if (i >= MAX_SKB_FRAGS) {
342 pr_debug("%s: packet too long\n", skb->dev->name);
343 skb->dev->stats.rx_length_errors++;
344 goto err_frags;
345 }
346 page = virtqueue_get_buf(rq->vq, &len);
347 if (!page) {
348 pr_debug("%s: rx error: %d buffers %d missing\n",
349 dev->name, hdr->mhdr.num_buffers, num_buf);
350 dev->stats.rx_length_errors++;
351 goto err_buf;
352 }
353
354 if (len > PAGE_SIZE)
355 len = PAGE_SIZE;
356
357 set_skb_frag(skb, page, 0, &len);
358
359 --rq->num;
360 }
361 return skb;
362err_skb:
363 give_pages(rq, page);
364 while (--num_buf) {
365err_frags:
366 buf = virtqueue_get_buf(rq->vq, &len);
367 if (unlikely(!buf)) {
368 pr_debug("%s: rx error: %d buffers missing\n",
369 dev->name, num_buf);
370 dev->stats.rx_length_errors++;
371 break;
372 }
373 page = buf;
374 give_pages(rq, page);
375 --rq->num;
376 }
377err_buf:
378 dev->stats.rx_dropped++;
379 dev_kfree_skb(skb);
380 return NULL;
381}
382
383static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
384{
385 struct virtnet_info *vi = rq->vq->vdev->priv;
386 struct net_device *dev = vi->dev;
387 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
388 struct sk_buff *skb;
389 struct skb_vnet_hdr *hdr;
390
391 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
392 pr_debug("%s: short packet %i\n", dev->name, len);
393 dev->stats.rx_length_errors++;
394 if (vi->mergeable_rx_bufs || vi->big_packets)
395 give_pages(rq, buf);
396 else
397 dev_kfree_skb(buf);
398 return;
399 }
400 if (vi->mergeable_rx_bufs)
401 skb = receive_mergeable(dev, rq, buf, len);
402 else if (vi->big_packets)
403 skb = receive_big(dev, rq, buf);
404 else
405 skb = receive_small(buf, len);
406
407 if (unlikely(!skb))
408 return;
409
410 hdr = skb_vnet_hdr(skb);
411
412 u64_stats_update_begin(&stats->rx_syncp);
413 stats->rx_bytes += skb->len;
414 stats->rx_packets++;
415 u64_stats_update_end(&stats->rx_syncp);
416
417 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
418 pr_debug("Needs csum!\n");
419 if (!skb_partial_csum_set(skb,
420 hdr->hdr.csum_start,
421 hdr->hdr.csum_offset))
422 goto frame_err;
423 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
424 skb->ip_summed = CHECKSUM_UNNECESSARY;
425 }
426
427 skb->protocol = eth_type_trans(skb, dev);
428 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
429 ntohs(skb->protocol), skb->len, skb->pkt_type);
430
431 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
432 pr_debug("GSO!\n");
433 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
434 case VIRTIO_NET_HDR_GSO_TCPV4:
435 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
436 break;
437 case VIRTIO_NET_HDR_GSO_UDP:
438 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
439 break;
440 case VIRTIO_NET_HDR_GSO_TCPV6:
441 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
442 break;
443 default:
444 net_warn_ratelimited("%s: bad gso type %u.\n",
445 dev->name, hdr->hdr.gso_type);
446 goto frame_err;
447 }
448
449 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
450 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
451
452 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
453 if (skb_shinfo(skb)->gso_size == 0) {
454 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
455 goto frame_err;
456 }
457
458 /* Header must be checked, and gso_segs computed. */
459 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
460 skb_shinfo(skb)->gso_segs = 0;
461 }
462
463 netif_receive_skb(skb);
464 return;
465
466frame_err:
467 dev->stats.rx_frame_errors++;
468 dev_kfree_skb(skb);
469}
470
471static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
472{
473 struct virtnet_info *vi = rq->vq->vdev->priv;
474 struct sk_buff *skb;
475 struct skb_vnet_hdr *hdr;
476 int err;
477
478 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
479 if (unlikely(!skb))
480 return -ENOMEM;
481
482 skb_put(skb, MAX_PACKET_LEN);
483
484 hdr = skb_vnet_hdr(skb);
485 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
486
487 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
488
489 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
490 if (err < 0)
491 dev_kfree_skb(skb);
492
493 return err;
494}
495
496static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
497{
498 struct page *first, *list = NULL;
499 char *p;
500 int i, err, offset;
501
502 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
503 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
504 first = get_a_page(rq, gfp);
505 if (!first) {
506 if (list)
507 give_pages(rq, list);
508 return -ENOMEM;
509 }
510 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
511
512 /* chain new page in list head to match sg */
513 first->private = (unsigned long)list;
514 list = first;
515 }
516
517 first = get_a_page(rq, gfp);
518 if (!first) {
519 give_pages(rq, list);
520 return -ENOMEM;
521 }
522 p = page_address(first);
523
524 /* rq->sg[0], rq->sg[1] share the same page */
525 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
526 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
527
528 /* rq->sg[1] for data packet, from offset */
529 offset = sizeof(struct padded_vnet_hdr);
530 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
531
532 /* chain first in list head */
533 first->private = (unsigned long)list;
534 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
535 first, gfp);
536 if (err < 0)
537 give_pages(rq, first);
538
539 return err;
540}
541
542static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
543{
544 struct page *page;
545 int err;
546
547 page = get_a_page(rq, gfp);
548 if (!page)
549 return -ENOMEM;
550
551 sg_init_one(rq->sg, page_address(page), PAGE_SIZE);
552
553 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, page, gfp);
554 if (err < 0)
555 give_pages(rq, page);
556
557 return err;
558}
559
560/*
561 * Returns false if we couldn't fill entirely (OOM).
562 *
563 * Normally run in the receive path, but can also be run from ndo_open
564 * before we're receiving packets, or from refill_work which is
565 * careful to disable receiving (using napi_disable).
566 */
567static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
568{
569 struct virtnet_info *vi = rq->vq->vdev->priv;
570 int err;
571 bool oom;
572
573 do {
574 if (vi->mergeable_rx_bufs)
575 err = add_recvbuf_mergeable(rq, gfp);
576 else if (vi->big_packets)
577 err = add_recvbuf_big(rq, gfp);
578 else
579 err = add_recvbuf_small(rq, gfp);
580
581 oom = err == -ENOMEM;
582 if (err)
583 break;
584 ++rq->num;
585 } while (rq->vq->num_free);
586 if (unlikely(rq->num > rq->max))
587 rq->max = rq->num;
588 virtqueue_kick(rq->vq);
589 return !oom;
590}
591
592static void skb_recv_done(struct virtqueue *rvq)
593{
594 struct virtnet_info *vi = rvq->vdev->priv;
595 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
596
597 /* Schedule NAPI, Suppress further interrupts if successful. */
598 if (napi_schedule_prep(&rq->napi)) {
599 virtqueue_disable_cb(rvq);
600 __napi_schedule(&rq->napi);
601 }
602}
603
604static void virtnet_napi_enable(struct receive_queue *rq)
605{
606 napi_enable(&rq->napi);
607
608 /* If all buffers were filled by other side before we napi_enabled, we
609 * won't get another interrupt, so process any outstanding packets
610 * now. virtnet_poll wants re-enable the queue, so we disable here.
611 * We synchronize against interrupts via NAPI_STATE_SCHED */
612 if (napi_schedule_prep(&rq->napi)) {
613 virtqueue_disable_cb(rq->vq);
614 local_bh_disable();
615 __napi_schedule(&rq->napi);
616 local_bh_enable();
617 }
618}
619
620static void refill_work(struct work_struct *work)
621{
622 struct virtnet_info *vi =
623 container_of(work, struct virtnet_info, refill.work);
624 bool still_empty;
625 int i;
626
627 for (i = 0; i < vi->curr_queue_pairs; i++) {
628 struct receive_queue *rq = &vi->rq[i];
629
630 napi_disable(&rq->napi);
631 still_empty = !try_fill_recv(rq, GFP_KERNEL);
632 virtnet_napi_enable(rq);
633
634 /* In theory, this can happen: if we don't get any buffers in
635 * we will *never* try to fill again.
636 */
637 if (still_empty)
638 schedule_delayed_work(&vi->refill, HZ/2);
639 }
640}
641
642static int virtnet_poll(struct napi_struct *napi, int budget)
643{
644 struct receive_queue *rq =
645 container_of(napi, struct receive_queue, napi);
646 struct virtnet_info *vi = rq->vq->vdev->priv;
647 void *buf;
648 unsigned int r, len, received = 0;
649
650again:
651 while (received < budget &&
652 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
653 receive_buf(rq, buf, len);
654 --rq->num;
655 received++;
656 }
657
658 if (rq->num < rq->max / 2) {
659 if (!try_fill_recv(rq, GFP_ATOMIC))
660 schedule_delayed_work(&vi->refill, 0);
661 }
662
663 /* Out of packets? */
664 if (received < budget) {
665 r = virtqueue_enable_cb_prepare(rq->vq);
666 napi_complete(napi);
667 if (unlikely(virtqueue_poll(rq->vq, r)) &&
668 napi_schedule_prep(napi)) {
669 virtqueue_disable_cb(rq->vq);
670 __napi_schedule(napi);
671 goto again;
672 }
673 }
674
675 return received;
676}
677
678static int virtnet_open(struct net_device *dev)
679{
680 struct virtnet_info *vi = netdev_priv(dev);
681 int i;
682
683 for (i = 0; i < vi->max_queue_pairs; i++) {
684 if (i < vi->curr_queue_pairs)
685 /* Make sure we have some buffers: if oom use wq. */
686 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
687 schedule_delayed_work(&vi->refill, 0);
688 virtnet_napi_enable(&vi->rq[i]);
689 }
690
691 return 0;
692}
693
694static void free_old_xmit_skbs(struct send_queue *sq)
695{
696 struct sk_buff *skb;
697 unsigned int len;
698 struct virtnet_info *vi = sq->vq->vdev->priv;
699 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
700
701 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
702 pr_debug("Sent skb %p\n", skb);
703
704 u64_stats_update_begin(&stats->tx_syncp);
705 stats->tx_bytes += skb->len;
706 stats->tx_packets++;
707 u64_stats_update_end(&stats->tx_syncp);
708
709 dev_kfree_skb_any(skb);
710 }
711}
712
713static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
714{
715 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
716 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
717 struct virtnet_info *vi = sq->vq->vdev->priv;
718 unsigned num_sg;
719
720 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
721
722 if (skb->ip_summed == CHECKSUM_PARTIAL) {
723 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
724 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
725 hdr->hdr.csum_offset = skb->csum_offset;
726 } else {
727 hdr->hdr.flags = 0;
728 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
729 }
730
731 if (skb_is_gso(skb)) {
732 hdr->hdr.hdr_len = skb_headlen(skb);
733 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
734 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
735 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
736 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
737 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
738 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
739 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
740 else
741 BUG();
742 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
743 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
744 } else {
745 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
746 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
747 }
748
749 hdr->mhdr.num_buffers = 0;
750
751 /* Encode metadata header at front. */
752 if (vi->mergeable_rx_bufs)
753 sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr);
754 else
755 sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr);
756
757 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
758 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
759}
760
761static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
762{
763 struct virtnet_info *vi = netdev_priv(dev);
764 int qnum = skb_get_queue_mapping(skb);
765 struct send_queue *sq = &vi->sq[qnum];
766 int err;
767
768 /* Free up any pending old buffers before queueing new ones. */
769 free_old_xmit_skbs(sq);
770
771 /* Try to transmit */
772 err = xmit_skb(sq, skb);
773
774 /* This should not happen! */
775 if (unlikely(err)) {
776 dev->stats.tx_fifo_errors++;
777 if (net_ratelimit())
778 dev_warn(&dev->dev,
779 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
780 dev->stats.tx_dropped++;
781 kfree_skb(skb);
782 return NETDEV_TX_OK;
783 }
784 virtqueue_kick(sq->vq);
785
786 /* Don't wait up for transmitted skbs to be freed. */
787 skb_orphan(skb);
788 nf_reset(skb);
789
790 /* Apparently nice girls don't return TX_BUSY; stop the queue
791 * before it gets out of hand. Naturally, this wastes entries. */
792 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
793 netif_stop_subqueue(dev, qnum);
794 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
795 /* More just got used, free them then recheck. */
796 free_old_xmit_skbs(sq);
797 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
798 netif_start_subqueue(dev, qnum);
799 virtqueue_disable_cb(sq->vq);
800 }
801 }
802 }
803
804 return NETDEV_TX_OK;
805}
806
807/*
808 * Send command via the control virtqueue and check status. Commands
809 * supported by the hypervisor, as indicated by feature bits, should
810 * never fail unless improperly formated.
811 */
812static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
813 struct scatterlist *out,
814 struct scatterlist *in)
815{
816 struct scatterlist *sgs[4], hdr, stat;
817 struct virtio_net_ctrl_hdr ctrl;
818 virtio_net_ctrl_ack status = ~0;
819 unsigned out_num = 0, in_num = 0, tmp;
820
821 /* Caller should know better */
822 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
823
824 ctrl.class = class;
825 ctrl.cmd = cmd;
826 /* Add header */
827 sg_init_one(&hdr, &ctrl, sizeof(ctrl));
828 sgs[out_num++] = &hdr;
829
830 if (out)
831 sgs[out_num++] = out;
832 if (in)
833 sgs[out_num + in_num++] = in;
834
835 /* Add return status. */
836 sg_init_one(&stat, &status, sizeof(status));
837 sgs[out_num + in_num++] = &stat;
838
839 BUG_ON(out_num + in_num > ARRAY_SIZE(sgs));
840 BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC)
841 < 0);
842
843 virtqueue_kick(vi->cvq);
844
845 /* Spin for a response, the kick causes an ioport write, trapping
846 * into the hypervisor, so the request should be handled immediately.
847 */
848 while (!virtqueue_get_buf(vi->cvq, &tmp))
849 cpu_relax();
850
851 return status == VIRTIO_NET_OK;
852}
853
854static int virtnet_set_mac_address(struct net_device *dev, void *p)
855{
856 struct virtnet_info *vi = netdev_priv(dev);
857 struct virtio_device *vdev = vi->vdev;
858 int ret;
859 struct sockaddr *addr = p;
860 struct scatterlist sg;
861
862 ret = eth_prepare_mac_addr_change(dev, p);
863 if (ret)
864 return ret;
865
866 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
867 sg_init_one(&sg, addr->sa_data, dev->addr_len);
868 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
869 VIRTIO_NET_CTRL_MAC_ADDR_SET,
870 &sg, NULL)) {
871 dev_warn(&vdev->dev,
872 "Failed to set mac address by vq command.\n");
873 return -EINVAL;
874 }
875 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
876 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
877 addr->sa_data, dev->addr_len);
878 }
879
880 eth_commit_mac_addr_change(dev, p);
881
882 return 0;
883}
884
885static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
886 struct rtnl_link_stats64 *tot)
887{
888 struct virtnet_info *vi = netdev_priv(dev);
889 int cpu;
890 unsigned int start;
891
892 for_each_possible_cpu(cpu) {
893 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
894 u64 tpackets, tbytes, rpackets, rbytes;
895
896 do {
897 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
898 tpackets = stats->tx_packets;
899 tbytes = stats->tx_bytes;
900 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
901
902 do {
903 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
904 rpackets = stats->rx_packets;
905 rbytes = stats->rx_bytes;
906 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
907
908 tot->rx_packets += rpackets;
909 tot->tx_packets += tpackets;
910 tot->rx_bytes += rbytes;
911 tot->tx_bytes += tbytes;
912 }
913
914 tot->tx_dropped = dev->stats.tx_dropped;
915 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
916 tot->rx_dropped = dev->stats.rx_dropped;
917 tot->rx_length_errors = dev->stats.rx_length_errors;
918 tot->rx_frame_errors = dev->stats.rx_frame_errors;
919
920 return tot;
921}
922
923#ifdef CONFIG_NET_POLL_CONTROLLER
924static void virtnet_netpoll(struct net_device *dev)
925{
926 struct virtnet_info *vi = netdev_priv(dev);
927 int i;
928
929 for (i = 0; i < vi->curr_queue_pairs; i++)
930 napi_schedule(&vi->rq[i].napi);
931}
932#endif
933
934static void virtnet_ack_link_announce(struct virtnet_info *vi)
935{
936 rtnl_lock();
937 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
938 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL))
939 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
940 rtnl_unlock();
941}
942
943static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
944{
945 struct scatterlist sg;
946 struct virtio_net_ctrl_mq s;
947 struct net_device *dev = vi->dev;
948
949 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
950 return 0;
951
952 s.virtqueue_pairs = queue_pairs;
953 sg_init_one(&sg, &s, sizeof(s));
954
955 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
956 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) {
957 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
958 queue_pairs);
959 return -EINVAL;
960 } else {
961 vi->curr_queue_pairs = queue_pairs;
962 /* virtnet_open() will refill when device is going to up. */
963 if (dev->flags & IFF_UP)
964 schedule_delayed_work(&vi->refill, 0);
965 }
966
967 return 0;
968}
969
970static int virtnet_close(struct net_device *dev)
971{
972 struct virtnet_info *vi = netdev_priv(dev);
973 int i;
974
975 /* Make sure refill_work doesn't re-enable napi! */
976 cancel_delayed_work_sync(&vi->refill);
977
978 for (i = 0; i < vi->max_queue_pairs; i++)
979 napi_disable(&vi->rq[i].napi);
980
981 return 0;
982}
983
984static void virtnet_set_rx_mode(struct net_device *dev)
985{
986 struct virtnet_info *vi = netdev_priv(dev);
987 struct scatterlist sg[2];
988 u8 promisc, allmulti;
989 struct virtio_net_ctrl_mac *mac_data;
990 struct netdev_hw_addr *ha;
991 int uc_count;
992 int mc_count;
993 void *buf;
994 int i;
995
996 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
997 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
998 return;
999
1000 promisc = ((dev->flags & IFF_PROMISC) != 0);
1001 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1002
1003 sg_init_one(sg, &promisc, sizeof(promisc));
1004
1005 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1006 VIRTIO_NET_CTRL_RX_PROMISC,
1007 sg, NULL))
1008 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1009 promisc ? "en" : "dis");
1010
1011 sg_init_one(sg, &allmulti, sizeof(allmulti));
1012
1013 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1014 VIRTIO_NET_CTRL_RX_ALLMULTI,
1015 sg, NULL))
1016 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1017 allmulti ? "en" : "dis");
1018
1019 uc_count = netdev_uc_count(dev);
1020 mc_count = netdev_mc_count(dev);
1021 /* MAC filter - use one buffer for both lists */
1022 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1023 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1024 mac_data = buf;
1025 if (!buf)
1026 return;
1027
1028 sg_init_table(sg, 2);
1029
1030 /* Store the unicast list and count in the front of the buffer */
1031 mac_data->entries = uc_count;
1032 i = 0;
1033 netdev_for_each_uc_addr(ha, dev)
1034 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1035
1036 sg_set_buf(&sg[0], mac_data,
1037 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1038
1039 /* multicast list and count fill the end */
1040 mac_data = (void *)&mac_data->macs[uc_count][0];
1041
1042 mac_data->entries = mc_count;
1043 i = 0;
1044 netdev_for_each_mc_addr(ha, dev)
1045 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1046
1047 sg_set_buf(&sg[1], mac_data,
1048 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1049
1050 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1051 VIRTIO_NET_CTRL_MAC_TABLE_SET,
1052 sg, NULL))
1053 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
1054
1055 kfree(buf);
1056}
1057
1058static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1059 __be16 proto, u16 vid)
1060{
1061 struct virtnet_info *vi = netdev_priv(dev);
1062 struct scatterlist sg;
1063
1064 sg_init_one(&sg, &vid, sizeof(vid));
1065
1066 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1067 VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL))
1068 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1069 return 0;
1070}
1071
1072static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1073 __be16 proto, u16 vid)
1074{
1075 struct virtnet_info *vi = netdev_priv(dev);
1076 struct scatterlist sg;
1077
1078 sg_init_one(&sg, &vid, sizeof(vid));
1079
1080 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1081 VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL))
1082 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1083 return 0;
1084}
1085
1086static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1087{
1088 int i;
1089 int cpu;
1090
1091 if (vi->affinity_hint_set) {
1092 for (i = 0; i < vi->max_queue_pairs; i++) {
1093 virtqueue_set_affinity(vi->rq[i].vq, -1);
1094 virtqueue_set_affinity(vi->sq[i].vq, -1);
1095 }
1096
1097 vi->affinity_hint_set = false;
1098 }
1099
1100 i = 0;
1101 for_each_online_cpu(cpu) {
1102 if (cpu == hcpu) {
1103 *per_cpu_ptr(vi->vq_index, cpu) = -1;
1104 } else {
1105 *per_cpu_ptr(vi->vq_index, cpu) =
1106 ++i % vi->curr_queue_pairs;
1107 }
1108 }
1109}
1110
1111static void virtnet_set_affinity(struct virtnet_info *vi)
1112{
1113 int i;
1114 int cpu;
1115
1116 /* In multiqueue mode, when the number of cpu is equal to the number of
1117 * queue pairs, we let the queue pairs to be private to one cpu by
1118 * setting the affinity hint to eliminate the contention.
1119 */
1120 if (vi->curr_queue_pairs == 1 ||
1121 vi->max_queue_pairs != num_online_cpus()) {
1122 virtnet_clean_affinity(vi, -1);
1123 return;
1124 }
1125
1126 i = 0;
1127 for_each_online_cpu(cpu) {
1128 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1129 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1130 *per_cpu_ptr(vi->vq_index, cpu) = i;
1131 i++;
1132 }
1133
1134 vi->affinity_hint_set = true;
1135}
1136
1137static int virtnet_cpu_callback(struct notifier_block *nfb,
1138 unsigned long action, void *hcpu)
1139{
1140 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
1141
1142 switch(action & ~CPU_TASKS_FROZEN) {
1143 case CPU_ONLINE:
1144 case CPU_DOWN_FAILED:
1145 case CPU_DEAD:
1146 virtnet_set_affinity(vi);
1147 break;
1148 case CPU_DOWN_PREPARE:
1149 virtnet_clean_affinity(vi, (long)hcpu);
1150 break;
1151 default:
1152 break;
1153 }
1154
1155 return NOTIFY_OK;
1156}
1157
1158static void virtnet_get_ringparam(struct net_device *dev,
1159 struct ethtool_ringparam *ring)
1160{
1161 struct virtnet_info *vi = netdev_priv(dev);
1162
1163 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1164 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1165 ring->rx_pending = ring->rx_max_pending;
1166 ring->tx_pending = ring->tx_max_pending;
1167}
1168
1169
1170static void virtnet_get_drvinfo(struct net_device *dev,
1171 struct ethtool_drvinfo *info)
1172{
1173 struct virtnet_info *vi = netdev_priv(dev);
1174 struct virtio_device *vdev = vi->vdev;
1175
1176 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1177 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1178 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1179
1180}
1181
1182/* TODO: Eliminate OOO packets during switching */
1183static int virtnet_set_channels(struct net_device *dev,
1184 struct ethtool_channels *channels)
1185{
1186 struct virtnet_info *vi = netdev_priv(dev);
1187 u16 queue_pairs = channels->combined_count;
1188 int err;
1189
1190 /* We don't support separate rx/tx channels.
1191 * We don't allow setting 'other' channels.
1192 */
1193 if (channels->rx_count || channels->tx_count || channels->other_count)
1194 return -EINVAL;
1195
1196 if (queue_pairs > vi->max_queue_pairs)
1197 return -EINVAL;
1198
1199 get_online_cpus();
1200 err = virtnet_set_queues(vi, queue_pairs);
1201 if (!err) {
1202 netif_set_real_num_tx_queues(dev, queue_pairs);
1203 netif_set_real_num_rx_queues(dev, queue_pairs);
1204
1205 virtnet_set_affinity(vi);
1206 }
1207 put_online_cpus();
1208
1209 return err;
1210}
1211
1212static void virtnet_get_channels(struct net_device *dev,
1213 struct ethtool_channels *channels)
1214{
1215 struct virtnet_info *vi = netdev_priv(dev);
1216
1217 channels->combined_count = vi->curr_queue_pairs;
1218 channels->max_combined = vi->max_queue_pairs;
1219 channels->max_other = 0;
1220 channels->rx_count = 0;
1221 channels->tx_count = 0;
1222 channels->other_count = 0;
1223}
1224
1225static const struct ethtool_ops virtnet_ethtool_ops = {
1226 .get_drvinfo = virtnet_get_drvinfo,
1227 .get_link = ethtool_op_get_link,
1228 .get_ringparam = virtnet_get_ringparam,
1229 .set_channels = virtnet_set_channels,
1230 .get_channels = virtnet_get_channels,
1231};
1232
1233#define MIN_MTU 68
1234#define MAX_MTU 65535
1235
1236static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1237{
1238 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1239 return -EINVAL;
1240 dev->mtu = new_mtu;
1241 return 0;
1242}
1243
1244/* To avoid contending a lock hold by a vcpu who would exit to host, select the
1245 * txq based on the processor id.
1246 */
1247static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
1248{
1249 int txq;
1250 struct virtnet_info *vi = netdev_priv(dev);
1251
1252 if (skb_rx_queue_recorded(skb)) {
1253 txq = skb_get_rx_queue(skb);
1254 } else {
1255 txq = *__this_cpu_ptr(vi->vq_index);
1256 if (txq == -1)
1257 txq = 0;
1258 }
1259
1260 while (unlikely(txq >= dev->real_num_tx_queues))
1261 txq -= dev->real_num_tx_queues;
1262
1263 return txq;
1264}
1265
1266static const struct net_device_ops virtnet_netdev = {
1267 .ndo_open = virtnet_open,
1268 .ndo_stop = virtnet_close,
1269 .ndo_start_xmit = start_xmit,
1270 .ndo_validate_addr = eth_validate_addr,
1271 .ndo_set_mac_address = virtnet_set_mac_address,
1272 .ndo_set_rx_mode = virtnet_set_rx_mode,
1273 .ndo_change_mtu = virtnet_change_mtu,
1274 .ndo_get_stats64 = virtnet_stats,
1275 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1276 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1277 .ndo_select_queue = virtnet_select_queue,
1278#ifdef CONFIG_NET_POLL_CONTROLLER
1279 .ndo_poll_controller = virtnet_netpoll,
1280#endif
1281};
1282
1283static void virtnet_config_changed_work(struct work_struct *work)
1284{
1285 struct virtnet_info *vi =
1286 container_of(work, struct virtnet_info, config_work);
1287 u16 v;
1288
1289 mutex_lock(&vi->config_lock);
1290 if (!vi->config_enable)
1291 goto done;
1292
1293 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
1294 offsetof(struct virtio_net_config, status),
1295 &v) < 0)
1296 goto done;
1297
1298 if (v & VIRTIO_NET_S_ANNOUNCE) {
1299 netdev_notify_peers(vi->dev);
1300 virtnet_ack_link_announce(vi);
1301 }
1302
1303 /* Ignore unknown (future) status bits */
1304 v &= VIRTIO_NET_S_LINK_UP;
1305
1306 if (vi->status == v)
1307 goto done;
1308
1309 vi->status = v;
1310
1311 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1312 netif_carrier_on(vi->dev);
1313 netif_tx_wake_all_queues(vi->dev);
1314 } else {
1315 netif_carrier_off(vi->dev);
1316 netif_tx_stop_all_queues(vi->dev);
1317 }
1318done:
1319 mutex_unlock(&vi->config_lock);
1320}
1321
1322static void virtnet_config_changed(struct virtio_device *vdev)
1323{
1324 struct virtnet_info *vi = vdev->priv;
1325
1326 schedule_work(&vi->config_work);
1327}
1328
1329static void virtnet_free_queues(struct virtnet_info *vi)
1330{
1331 int i;
1332
1333 for (i = 0; i < vi->max_queue_pairs; i++)
1334 netif_napi_del(&vi->rq[i].napi);
1335
1336 kfree(vi->rq);
1337 kfree(vi->sq);
1338}
1339
1340static void free_receive_bufs(struct virtnet_info *vi)
1341{
1342 int i;
1343
1344 for (i = 0; i < vi->max_queue_pairs; i++) {
1345 while (vi->rq[i].pages)
1346 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1347 }
1348}
1349
1350static void free_unused_bufs(struct virtnet_info *vi)
1351{
1352 void *buf;
1353 int i;
1354
1355 for (i = 0; i < vi->max_queue_pairs; i++) {
1356 struct virtqueue *vq = vi->sq[i].vq;
1357 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1358 dev_kfree_skb(buf);
1359 }
1360
1361 for (i = 0; i < vi->max_queue_pairs; i++) {
1362 struct virtqueue *vq = vi->rq[i].vq;
1363
1364 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1365 if (vi->mergeable_rx_bufs || vi->big_packets)
1366 give_pages(&vi->rq[i], buf);
1367 else
1368 dev_kfree_skb(buf);
1369 --vi->rq[i].num;
1370 }
1371 BUG_ON(vi->rq[i].num != 0);
1372 }
1373}
1374
1375static void virtnet_del_vqs(struct virtnet_info *vi)
1376{
1377 struct virtio_device *vdev = vi->vdev;
1378
1379 virtnet_clean_affinity(vi, -1);
1380
1381 vdev->config->del_vqs(vdev);
1382
1383 virtnet_free_queues(vi);
1384}
1385
1386static int virtnet_find_vqs(struct virtnet_info *vi)
1387{
1388 vq_callback_t **callbacks;
1389 struct virtqueue **vqs;
1390 int ret = -ENOMEM;
1391 int i, total_vqs;
1392 const char **names;
1393
1394 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1395 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1396 * possible control vq.
1397 */
1398 total_vqs = vi->max_queue_pairs * 2 +
1399 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1400
1401 /* Allocate space for find_vqs parameters */
1402 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1403 if (!vqs)
1404 goto err_vq;
1405 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1406 if (!callbacks)
1407 goto err_callback;
1408 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1409 if (!names)
1410 goto err_names;
1411
1412 /* Parameters for control virtqueue, if any */
1413 if (vi->has_cvq) {
1414 callbacks[total_vqs - 1] = NULL;
1415 names[total_vqs - 1] = "control";
1416 }
1417
1418 /* Allocate/initialize parameters for send/receive virtqueues */
1419 for (i = 0; i < vi->max_queue_pairs; i++) {
1420 callbacks[rxq2vq(i)] = skb_recv_done;
1421 callbacks[txq2vq(i)] = skb_xmit_done;
1422 sprintf(vi->rq[i].name, "input.%d", i);
1423 sprintf(vi->sq[i].name, "output.%d", i);
1424 names[rxq2vq(i)] = vi->rq[i].name;
1425 names[txq2vq(i)] = vi->sq[i].name;
1426 }
1427
1428 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1429 names);
1430 if (ret)
1431 goto err_find;
1432
1433 if (vi->has_cvq) {
1434 vi->cvq = vqs[total_vqs - 1];
1435 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1436 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1437 }
1438
1439 for (i = 0; i < vi->max_queue_pairs; i++) {
1440 vi->rq[i].vq = vqs[rxq2vq(i)];
1441 vi->sq[i].vq = vqs[txq2vq(i)];
1442 }
1443
1444 kfree(names);
1445 kfree(callbacks);
1446 kfree(vqs);
1447
1448 return 0;
1449
1450err_find:
1451 kfree(names);
1452err_names:
1453 kfree(callbacks);
1454err_callback:
1455 kfree(vqs);
1456err_vq:
1457 return ret;
1458}
1459
1460static int virtnet_alloc_queues(struct virtnet_info *vi)
1461{
1462 int i;
1463
1464 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1465 if (!vi->sq)
1466 goto err_sq;
1467 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1468 if (!vi->rq)
1469 goto err_rq;
1470
1471 INIT_DELAYED_WORK(&vi->refill, refill_work);
1472 for (i = 0; i < vi->max_queue_pairs; i++) {
1473 vi->rq[i].pages = NULL;
1474 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1475 napi_weight);
1476
1477 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1478 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1479 }
1480
1481 return 0;
1482
1483err_rq:
1484 kfree(vi->sq);
1485err_sq:
1486 return -ENOMEM;
1487}
1488
1489static int init_vqs(struct virtnet_info *vi)
1490{
1491 int ret;
1492
1493 /* Allocate send & receive queues */
1494 ret = virtnet_alloc_queues(vi);
1495 if (ret)
1496 goto err;
1497
1498 ret = virtnet_find_vqs(vi);
1499 if (ret)
1500 goto err_free;
1501
1502 get_online_cpus();
1503 virtnet_set_affinity(vi);
1504 put_online_cpus();
1505
1506 return 0;
1507
1508err_free:
1509 virtnet_free_queues(vi);
1510err:
1511 return ret;
1512}
1513
1514static int virtnet_probe(struct virtio_device *vdev)
1515{
1516 int i, err;
1517 struct net_device *dev;
1518 struct virtnet_info *vi;
1519 u16 max_queue_pairs;
1520
1521 /* Find if host supports multiqueue virtio_net device */
1522 err = virtio_config_val(vdev, VIRTIO_NET_F_MQ,
1523 offsetof(struct virtio_net_config,
1524 max_virtqueue_pairs), &max_queue_pairs);
1525
1526 /* We need at least 2 queue's */
1527 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1528 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1529 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1530 max_queue_pairs = 1;
1531
1532 /* Allocate ourselves a network device with room for our info */
1533 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1534 if (!dev)
1535 return -ENOMEM;
1536
1537 /* Set up network device as normal. */
1538 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1539 dev->netdev_ops = &virtnet_netdev;
1540 dev->features = NETIF_F_HIGHDMA;
1541
1542 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1543 SET_NETDEV_DEV(dev, &vdev->dev);
1544
1545 /* Do we support "hardware" checksums? */
1546 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1547 /* This opens up the world of extra features. */
1548 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
1549 if (csum)
1550 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
1551
1552 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1553 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1554 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1555 }
1556 /* Individual feature bits: what can host handle? */
1557 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1558 dev->hw_features |= NETIF_F_TSO;
1559 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1560 dev->hw_features |= NETIF_F_TSO6;
1561 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1562 dev->hw_features |= NETIF_F_TSO_ECN;
1563 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1564 dev->hw_features |= NETIF_F_UFO;
1565
1566 if (gso)
1567 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1568 /* (!csum && gso) case will be fixed by register_netdev() */
1569 }
1570
1571 dev->vlan_features = dev->features;
1572
1573 /* Configuration may specify what MAC to use. Otherwise random. */
1574 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1575 offsetof(struct virtio_net_config, mac),
1576 dev->dev_addr, dev->addr_len) < 0)
1577 eth_hw_addr_random(dev);
1578
1579 /* Set up our device-specific information */
1580 vi = netdev_priv(dev);
1581 vi->dev = dev;
1582 vi->vdev = vdev;
1583 vdev->priv = vi;
1584 vi->stats = alloc_percpu(struct virtnet_stats);
1585 err = -ENOMEM;
1586 if (vi->stats == NULL)
1587 goto free;
1588
1589 vi->vq_index = alloc_percpu(int);
1590 if (vi->vq_index == NULL)
1591 goto free_stats;
1592
1593 mutex_init(&vi->config_lock);
1594 vi->config_enable = true;
1595 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1596
1597 /* If we can receive ANY GSO packets, we must allocate large ones. */
1598 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1599 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1600 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
1601 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
1602 vi->big_packets = true;
1603
1604 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1605 vi->mergeable_rx_bufs = true;
1606
1607 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1608 vi->has_cvq = true;
1609
1610 /* Use single tx/rx queue pair as default */
1611 vi->curr_queue_pairs = 1;
1612 vi->max_queue_pairs = max_queue_pairs;
1613
1614 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1615 err = init_vqs(vi);
1616 if (err)
1617 goto free_index;
1618
1619 netif_set_real_num_tx_queues(dev, 1);
1620 netif_set_real_num_rx_queues(dev, 1);
1621
1622 err = register_netdev(dev);
1623 if (err) {
1624 pr_debug("virtio_net: registering device failed\n");
1625 goto free_vqs;
1626 }
1627
1628 /* Last of all, set up some receive buffers. */
1629 for (i = 0; i < vi->curr_queue_pairs; i++) {
1630 try_fill_recv(&vi->rq[i], GFP_KERNEL);
1631
1632 /* If we didn't even get one input buffer, we're useless. */
1633 if (vi->rq[i].num == 0) {
1634 free_unused_bufs(vi);
1635 err = -ENOMEM;
1636 goto free_recv_bufs;
1637 }
1638 }
1639
1640 vi->nb.notifier_call = &virtnet_cpu_callback;
1641 err = register_hotcpu_notifier(&vi->nb);
1642 if (err) {
1643 pr_debug("virtio_net: registering cpu notifier failed\n");
1644 goto free_recv_bufs;
1645 }
1646
1647 /* Assume link up if device can't report link status,
1648 otherwise get link status from config. */
1649 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1650 netif_carrier_off(dev);
1651 schedule_work(&vi->config_work);
1652 } else {
1653 vi->status = VIRTIO_NET_S_LINK_UP;
1654 netif_carrier_on(dev);
1655 }
1656
1657 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1658 dev->name, max_queue_pairs);
1659
1660 return 0;
1661
1662free_recv_bufs:
1663 free_receive_bufs(vi);
1664 unregister_netdev(dev);
1665free_vqs:
1666 cancel_delayed_work_sync(&vi->refill);
1667 virtnet_del_vqs(vi);
1668free_index:
1669 free_percpu(vi->vq_index);
1670free_stats:
1671 free_percpu(vi->stats);
1672free:
1673 free_netdev(dev);
1674 return err;
1675}
1676
1677static void remove_vq_common(struct virtnet_info *vi)
1678{
1679 vi->vdev->config->reset(vi->vdev);
1680
1681 /* Free unused buffers in both send and recv, if any. */
1682 free_unused_bufs(vi);
1683
1684 free_receive_bufs(vi);
1685
1686 virtnet_del_vqs(vi);
1687}
1688
1689static void virtnet_remove(struct virtio_device *vdev)
1690{
1691 struct virtnet_info *vi = vdev->priv;
1692
1693 unregister_hotcpu_notifier(&vi->nb);
1694
1695 /* Prevent config work handler from accessing the device. */
1696 mutex_lock(&vi->config_lock);
1697 vi->config_enable = false;
1698 mutex_unlock(&vi->config_lock);
1699
1700 unregister_netdev(vi->dev);
1701
1702 remove_vq_common(vi);
1703
1704 flush_work(&vi->config_work);
1705
1706 free_percpu(vi->vq_index);
1707 free_percpu(vi->stats);
1708 free_netdev(vi->dev);
1709}
1710
1711#ifdef CONFIG_PM
1712static int virtnet_freeze(struct virtio_device *vdev)
1713{
1714 struct virtnet_info *vi = vdev->priv;
1715 int i;
1716
1717 unregister_hotcpu_notifier(&vi->nb);
1718
1719 /* Prevent config work handler from accessing the device */
1720 mutex_lock(&vi->config_lock);
1721 vi->config_enable = false;
1722 mutex_unlock(&vi->config_lock);
1723
1724 netif_device_detach(vi->dev);
1725 cancel_delayed_work_sync(&vi->refill);
1726
1727 if (netif_running(vi->dev))
1728 for (i = 0; i < vi->max_queue_pairs; i++) {
1729 napi_disable(&vi->rq[i].napi);
1730 netif_napi_del(&vi->rq[i].napi);
1731 }
1732
1733 remove_vq_common(vi);
1734
1735 flush_work(&vi->config_work);
1736
1737 return 0;
1738}
1739
1740static int virtnet_restore(struct virtio_device *vdev)
1741{
1742 struct virtnet_info *vi = vdev->priv;
1743 int err, i;
1744
1745 err = init_vqs(vi);
1746 if (err)
1747 return err;
1748
1749 if (netif_running(vi->dev)) {
1750 for (i = 0; i < vi->curr_queue_pairs; i++)
1751 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
1752 schedule_delayed_work(&vi->refill, 0);
1753
1754 for (i = 0; i < vi->max_queue_pairs; i++)
1755 virtnet_napi_enable(&vi->rq[i]);
1756 }
1757
1758 netif_device_attach(vi->dev);
1759
1760 mutex_lock(&vi->config_lock);
1761 vi->config_enable = true;
1762 mutex_unlock(&vi->config_lock);
1763
1764 rtnl_lock();
1765 virtnet_set_queues(vi, vi->curr_queue_pairs);
1766 rtnl_unlock();
1767
1768 err = register_hotcpu_notifier(&vi->nb);
1769 if (err)
1770 return err;
1771
1772 return 0;
1773}
1774#endif
1775
1776static struct virtio_device_id id_table[] = {
1777 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1778 { 0 },
1779};
1780
1781static unsigned int features[] = {
1782 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1783 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1784 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1785 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1786 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1787 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1788 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1789 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
1790 VIRTIO_NET_F_CTRL_MAC_ADDR,
1791};
1792
1793static struct virtio_driver virtio_net_driver = {
1794 .feature_table = features,
1795 .feature_table_size = ARRAY_SIZE(features),
1796 .driver.name = KBUILD_MODNAME,
1797 .driver.owner = THIS_MODULE,
1798 .id_table = id_table,
1799 .probe = virtnet_probe,
1800 .remove = virtnet_remove,
1801 .config_changed = virtnet_config_changed,
1802#ifdef CONFIG_PM
1803 .freeze = virtnet_freeze,
1804 .restore = virtnet_restore,
1805#endif
1806};
1807
1808module_virtio_driver(virtio_net_driver);
1809
1810MODULE_DEVICE_TABLE(virtio, id_table);
1811MODULE_DESCRIPTION("Virtio network driver");
1812MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)