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Linux 3.18.86
[linux/fpc-iii.git] / drivers / net / virtio_net.c
blobce2a29971230cba661085228eef519eb71be2aab
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, see <http://www.gnu.org/licenses/>.
17 */
18 //#define DEBUG
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/ethtool.h>
22 #include <linux/module.h>
23 #include <linux/virtio.h>
24 #include <linux/virtio_net.h>
25 #include <linux/scatterlist.h>
26 #include <linux/if_vlan.h>
27 #include <linux/slab.h>
28 #include <linux/cpu.h>
29 #include <linux/average.h>
30 #include <net/busy_poll.h>
31
32 static int napi_weight = NAPI_POLL_WEIGHT;
33 module_param(napi_weight, int, 0444);
34
35 static bool csum = true, gso = true;
36 module_param(csum, bool, 0444);
37 module_param(gso, bool, 0444);
38
39 /* FIXME: MTU in config. */
40 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
41 #define GOOD_COPY_LEN 128
42
43 /* Weight used for the RX packet size EWMA. The average packet size is used to
44 * determine the packet buffer size when refilling RX rings. As the entire RX
45 * ring may be refilled at once, the weight is chosen so that the EWMA will be
46 * insensitive to short-term, transient changes in packet size.
47 */
48 #define RECEIVE_AVG_WEIGHT 64
49
50 /* Minimum alignment for mergeable packet buffers. */
51 #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256)
52
53 #define VIRTNET_DRIVER_VERSION "1.0.0"
54
55 struct virtnet_stats {
56 struct u64_stats_sync tx_syncp;
57 struct u64_stats_sync rx_syncp;
58 u64 tx_bytes;
59 u64 tx_packets;
60
61 u64 rx_bytes;
62 u64 rx_packets;
63 };
64
65 /* Internal representation of a send virtqueue */
66 struct send_queue {
67 /* Virtqueue associated with this send _queue */
68 struct virtqueue *vq;
69
70 /* TX: fragments + linear part + virtio header */
71 struct scatterlist sg[MAX_SKB_FRAGS + 2];
72
73 /* Name of the send queue: output.$index */
74 char name[40];
75 };
76
77 /* Internal representation of a receive virtqueue */
78 struct receive_queue {
79 /* Virtqueue associated with this receive_queue */
80 struct virtqueue *vq;
81
82 struct napi_struct napi;
83
84 /* Chain pages by the private ptr. */
85 struct page *pages;
86
87 /* Average packet length for mergeable receive buffers. */
88 struct ewma mrg_avg_pkt_len;
89
90 /* Page frag for packet buffer allocation. */
91 struct page_frag alloc_frag;
92
93 /* RX: fragments + linear part + virtio header */
94 struct scatterlist sg[MAX_SKB_FRAGS + 2];
95
96 /* Name of this receive queue: input.$index */
97 char name[40];
98 };
99
100 struct virtnet_info {
101 struct virtio_device *vdev;
102 struct virtqueue *cvq;
103 struct net_device *dev;
104 struct send_queue *sq;
105 struct receive_queue *rq;
106 unsigned int status;
107
108 /* Max # of queue pairs supported by the device */
109 u16 max_queue_pairs;
110
111 /* # of queue pairs currently used by the driver */
112 u16 curr_queue_pairs;
113
114 /* I like... big packets and I cannot lie! */
115 bool big_packets;
116
117 /* Host will merge rx buffers for big packets (shake it! shake it!) */
118 bool mergeable_rx_bufs;
119
120 /* Has control virtqueue */
121 bool has_cvq;
122
123 /* Host can handle any s/g split between our header and packet data */
124 bool any_header_sg;
125
126 /* Active statistics */
127 struct virtnet_stats __percpu *stats;
128
129 /* Work struct for refilling if we run low on memory. */
130 struct delayed_work refill;
131
132 /* Work struct for config space updates */
133 struct work_struct config_work;
134
135 /* Does the affinity hint is set for virtqueues? */
136 bool affinity_hint_set;
137
138 /* CPU hot plug notifier */
139 struct notifier_block nb;
140 };
141
142 struct skb_vnet_hdr {
143 union {
144 struct virtio_net_hdr hdr;
145 struct virtio_net_hdr_mrg_rxbuf mhdr;
146 };
147 };
148
149 struct padded_vnet_hdr {
150 struct virtio_net_hdr hdr;
151 /*
152 * virtio_net_hdr should be in a separated sg buffer because of a
153 * QEMU bug, and data sg buffer shares same page with this header sg.
154 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
155 */
156 char padding[6];
157 };
158
159 /* Converting between virtqueue no. and kernel tx/rx queue no.
160 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
161 */
162 static int vq2txq(struct virtqueue *vq)
163 {
164 return (vq->index - 1) / 2;
165 }
166
167 static int txq2vq(int txq)
168 {
169 return txq * 2 + 1;
170 }
171
172 static int vq2rxq(struct virtqueue *vq)
173 {
174 return vq->index / 2;
175 }
176
177 static int rxq2vq(int rxq)
178 {
179 return rxq * 2;
180 }
181
182 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
183 {
184 return (struct skb_vnet_hdr *)skb->cb;
185 }
186
187 /*
188 * private is used to chain pages for big packets, put the whole
189 * most recent used list in the beginning for reuse
190 */
191 static void give_pages(struct receive_queue *rq, struct page *page)
192 {
193 struct page *end;
194
195 /* Find end of list, sew whole thing into vi->rq.pages. */
196 for (end = page; end->private; end = (struct page *)end->private);
197 end->private = (unsigned long)rq->pages;
198 rq->pages = page;
199 }
200
201 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
202 {
203 struct page *p = rq->pages;
204
205 if (p) {
206 rq->pages = (struct page *)p->private;
207 /* clear private here, it is used to chain pages */
208 p->private = 0;
209 } else
210 p = alloc_page(gfp_mask);
211 return p;
212 }
213
214 static void skb_xmit_done(struct virtqueue *vq)
215 {
216 struct virtnet_info *vi = vq->vdev->priv;
217
218 /* Suppress further interrupts. */
219 virtqueue_disable_cb(vq);
220
221 /* We were probably waiting for more output buffers. */
222 netif_wake_subqueue(vi->dev, vq2txq(vq));
223 }
224
225 static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx)
226 {
227 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1);
228 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN;
229 }
230
231 static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx)
232 {
233 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN);
234
235 }
236
237 static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize)
238 {
239 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN;
240 return (unsigned long)buf | (size - 1);
241 }
242
243 /* Called from bottom half context */
244 static struct sk_buff *page_to_skb(struct receive_queue *rq,
245 struct page *page, unsigned int offset,
246 unsigned int len, unsigned int truesize)
247 {
248 struct virtnet_info *vi = rq->vq->vdev->priv;
249 struct sk_buff *skb;
250 struct skb_vnet_hdr *hdr;
251 unsigned int copy, hdr_len, hdr_padded_len;
252 char *p;
253
254 p = page_address(page) + offset;
255
256 /* copy small packet so we can reuse these pages for small data */
257 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
258 if (unlikely(!skb))
259 return NULL;
260
261 hdr = skb_vnet_hdr(skb);
262
263 if (vi->mergeable_rx_bufs) {
264 hdr_len = sizeof hdr->mhdr;
265 hdr_padded_len = sizeof hdr->mhdr;
266 } else {
267 hdr_len = sizeof hdr->hdr;
268 hdr_padded_len = sizeof(struct padded_vnet_hdr);
269 }
270
271 memcpy(hdr, p, hdr_len);
272
273 len -= hdr_len;
274 offset += hdr_padded_len;
275 p += hdr_padded_len;
276
277 copy = len;
278 if (copy > skb_tailroom(skb))
279 copy = skb_tailroom(skb);
280 memcpy(skb_put(skb, copy), p, copy);
281
282 len -= copy;
283 offset += copy;
284
285 if (vi->mergeable_rx_bufs) {
286 if (len)
287 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
288 else
289 put_page(page);
290 return skb;
291 }
292
293 /*
294 * Verify that we can indeed put this data into a skb.
295 * This is here to handle cases when the device erroneously
296 * tries to receive more than is possible. This is usually
297 * the case of a broken device.
298 */
299 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
300 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
301 dev_kfree_skb(skb);
302 return NULL;
303 }
304 BUG_ON(offset >= PAGE_SIZE);
305 while (len) {
306 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
307 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
308 frag_size, truesize);
309 len -= frag_size;
310 page = (struct page *)page->private;
311 offset = 0;
312 }
313
314 if (page)
315 give_pages(rq, page);
316
317 return skb;
318 }
319
320 static struct sk_buff *receive_small(void *buf, unsigned int len)
321 {
322 struct sk_buff * skb = buf;
323
324 len -= sizeof(struct virtio_net_hdr);
325 skb_trim(skb, len);
326
327 return skb;
328 }
329
330 static struct sk_buff *receive_big(struct net_device *dev,
331 struct receive_queue *rq,
332 void *buf,
333 unsigned int len)
334 {
335 struct page *page = buf;
336 struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
337
338 if (unlikely(!skb))
339 goto err;
340
341 return skb;
342
343 err:
344 dev->stats.rx_dropped++;
345 give_pages(rq, page);
346 return NULL;
347 }
348
349 static struct sk_buff *receive_mergeable(struct net_device *dev,
350 struct receive_queue *rq,
351 unsigned long ctx,
352 unsigned int len)
353 {
354 void *buf = mergeable_ctx_to_buf_address(ctx);
355 struct skb_vnet_hdr *hdr = buf;
356 int num_buf = hdr->mhdr.num_buffers;
357 struct page *page = virt_to_head_page(buf);
358 int offset = buf - page_address(page);
359 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
360
361 struct sk_buff *head_skb = page_to_skb(rq, page, offset, len, truesize);
362 struct sk_buff *curr_skb = head_skb;
363
364 if (unlikely(!curr_skb))
365 goto err_skb;
366 while (--num_buf) {
367 int num_skb_frags;
368
369 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
370 if (unlikely(!ctx)) {
371 pr_debug("%s: rx error: %d buffers out of %d missing\n",
372 dev->name, num_buf, hdr->mhdr.num_buffers);
373 dev->stats.rx_length_errors++;
374 goto err_buf;
375 }
376
377 buf = mergeable_ctx_to_buf_address(ctx);
378 page = virt_to_head_page(buf);
379
380 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
381 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
382 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
383
384 if (unlikely(!nskb))
385 goto err_skb;
386 if (curr_skb == head_skb)
387 skb_shinfo(curr_skb)->frag_list = nskb;
388 else
389 curr_skb->next = nskb;
390 curr_skb = nskb;
391 head_skb->truesize += nskb->truesize;
392 num_skb_frags = 0;
393 }
394 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
395 if (curr_skb != head_skb) {
396 head_skb->data_len += len;
397 head_skb->len += len;
398 head_skb->truesize += truesize;
399 }
400 offset = buf - page_address(page);
401 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
402 put_page(page);
403 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
404 len, truesize);
405 } else {
406 skb_add_rx_frag(curr_skb, num_skb_frags, page,
407 offset, len, truesize);
408 }
409 }
410
411 ewma_add(&rq->mrg_avg_pkt_len, head_skb->len);
412 return head_skb;
413
414 err_skb:
415 put_page(page);
416 while (--num_buf) {
417 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
418 if (unlikely(!ctx)) {
419 pr_debug("%s: rx error: %d buffers missing\n",
420 dev->name, num_buf);
421 dev->stats.rx_length_errors++;
422 break;
423 }
424 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
425 put_page(page);
426 }
427 err_buf:
428 dev->stats.rx_dropped++;
429 dev_kfree_skb(head_skb);
430 return NULL;
431 }
432
433 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
434 {
435 struct virtnet_info *vi = rq->vq->vdev->priv;
436 struct net_device *dev = vi->dev;
437 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
438 struct sk_buff *skb;
439 struct skb_vnet_hdr *hdr;
440
441 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
442 pr_debug("%s: short packet %i\n", dev->name, len);
443 dev->stats.rx_length_errors++;
444 if (vi->mergeable_rx_bufs) {
445 unsigned long ctx = (unsigned long)buf;
446 void *base = mergeable_ctx_to_buf_address(ctx);
447 put_page(virt_to_head_page(base));
448 } else if (vi->big_packets) {
449 give_pages(rq, buf);
450 } else {
451 dev_kfree_skb(buf);
452 }
453 return;
454 }
455
456 if (vi->mergeable_rx_bufs)
457 skb = receive_mergeable(dev, rq, (unsigned long)buf, len);
458 else if (vi->big_packets)
459 skb = receive_big(dev, rq, buf, len);
460 else
461 skb = receive_small(buf, len);
462
463 if (unlikely(!skb))
464 return;
465
466 hdr = skb_vnet_hdr(skb);
467
468 u64_stats_update_begin(&stats->rx_syncp);
469 stats->rx_bytes += skb->len;
470 stats->rx_packets++;
471 u64_stats_update_end(&stats->rx_syncp);
472
473 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
474 pr_debug("Needs csum!\n");
475 if (!skb_partial_csum_set(skb,
476 hdr->hdr.csum_start,
477 hdr->hdr.csum_offset))
478 goto frame_err;
479 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
480 skb->ip_summed = CHECKSUM_UNNECESSARY;
481 }
482
483 skb->protocol = eth_type_trans(skb, dev);
484 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
485 ntohs(skb->protocol), skb->len, skb->pkt_type);
486
487 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
488 pr_debug("GSO!\n");
489 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
490 case VIRTIO_NET_HDR_GSO_TCPV4:
491 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
492 break;
493 case VIRTIO_NET_HDR_GSO_UDP:
494 {
495 static bool warned;
496
497 if (!warned) {
498 warned = true;
499 netdev_warn(dev,
500 "host using disabled UFO feature; please fix it\n");
501 }
502 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
503 break;
504 }
505 case VIRTIO_NET_HDR_GSO_TCPV6:
506 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
507 break;
508 default:
509 net_warn_ratelimited("%s: bad gso type %u.\n",
510 dev->name, hdr->hdr.gso_type);
511 goto frame_err;
512 }
513
514 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
515 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
516
517 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
518 if (skb_shinfo(skb)->gso_size == 0) {
519 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
520 goto frame_err;
521 }
522
523 /* Header must be checked, and gso_segs computed. */
524 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
525 skb_shinfo(skb)->gso_segs = 0;
526 }
527
528 skb_mark_napi_id(skb, &rq->napi);
529
530 netif_receive_skb(skb);
531 return;
532
533 frame_err:
534 dev->stats.rx_frame_errors++;
535 dev_kfree_skb(skb);
536 }
537
538 static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
539 {
540 struct virtnet_info *vi = rq->vq->vdev->priv;
541 struct sk_buff *skb;
542 struct skb_vnet_hdr *hdr;
543 int err;
544
545 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
546 if (unlikely(!skb))
547 return -ENOMEM;
548
549 skb_put(skb, GOOD_PACKET_LEN);
550
551 hdr = skb_vnet_hdr(skb);
552 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
553 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
554 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
555
556 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
557 if (err < 0)
558 dev_kfree_skb(skb);
559
560 return err;
561 }
562
563 static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
564 {
565 struct page *first, *list = NULL;
566 char *p;
567 int i, err, offset;
568
569 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
570
571 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
572 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
573 first = get_a_page(rq, gfp);
574 if (!first) {
575 if (list)
576 give_pages(rq, list);
577 return -ENOMEM;
578 }
579 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
580
581 /* chain new page in list head to match sg */
582 first->private = (unsigned long)list;
583 list = first;
584 }
585
586 first = get_a_page(rq, gfp);
587 if (!first) {
588 give_pages(rq, list);
589 return -ENOMEM;
590 }
591 p = page_address(first);
592
593 /* rq->sg[0], rq->sg[1] share the same page */
594 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
595 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
596
597 /* rq->sg[1] for data packet, from offset */
598 offset = sizeof(struct padded_vnet_hdr);
599 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
600
601 /* chain first in list head */
602 first->private = (unsigned long)list;
603 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
604 first, gfp);
605 if (err < 0)
606 give_pages(rq, first);
607
608 return err;
609 }
610
611 static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len)
612 {
613 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
614 unsigned int len;
615
616 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len),
617 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
618 return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
619 }
620
621 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
622 {
623 struct page_frag *alloc_frag = &rq->alloc_frag;
624 char *buf;
625 unsigned long ctx;
626 int err;
627 unsigned int len, hole;
628
629 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
630 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
631 return -ENOMEM;
632
633 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
634 ctx = mergeable_buf_to_ctx(buf, len);
635 get_page(alloc_frag->page);
636 alloc_frag->offset += len;
637 hole = alloc_frag->size - alloc_frag->offset;
638 if (hole < len) {
639 /* To avoid internal fragmentation, if there is very likely not
640 * enough space for another buffer, add the remaining space to
641 * the current buffer. This extra space is not included in
642 * the truesize stored in ctx.
643 */
644 len += hole;
645 alloc_frag->offset += hole;
646 }
647
648 sg_init_one(rq->sg, buf, len);
649 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
650 if (err < 0)
651 put_page(virt_to_head_page(buf));
652
653 return err;
654 }
655
656 /*
657 * Returns false if we couldn't fill entirely (OOM).
658 *
659 * Normally run in the receive path, but can also be run from ndo_open
660 * before we're receiving packets, or from refill_work which is
661 * careful to disable receiving (using napi_disable).
662 */
663 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
664 {
665 struct virtnet_info *vi = rq->vq->vdev->priv;
666 int err;
667 bool oom;
668
669 gfp |= __GFP_COLD;
670 do {
671 if (vi->mergeable_rx_bufs)
672 err = add_recvbuf_mergeable(rq, gfp);
673 else if (vi->big_packets)
674 err = add_recvbuf_big(rq, gfp);
675 else
676 err = add_recvbuf_small(rq, gfp);
677
678 oom = err == -ENOMEM;
679 if (err)
680 break;
681 } while (rq->vq->num_free);
682 virtqueue_kick(rq->vq);
683 return !oom;
684 }
685
686 static void skb_recv_done(struct virtqueue *rvq)
687 {
688 struct virtnet_info *vi = rvq->vdev->priv;
689 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
690
691 /* Schedule NAPI, Suppress further interrupts if successful. */
692 if (napi_schedule_prep(&rq->napi)) {
693 virtqueue_disable_cb(rvq);
694 __napi_schedule(&rq->napi);
695 }
696 }
697
698 static void virtnet_napi_enable(struct receive_queue *rq)
699 {
700 napi_enable(&rq->napi);
701
702 /* If all buffers were filled by other side before we napi_enabled, we
703 * won't get another interrupt, so process any outstanding packets
704 * now. virtnet_poll wants re-enable the queue, so we disable here.
705 * We synchronize against interrupts via NAPI_STATE_SCHED */
706 if (napi_schedule_prep(&rq->napi)) {
707 virtqueue_disable_cb(rq->vq);
708 local_bh_disable();
709 __napi_schedule(&rq->napi);
710 local_bh_enable();
711 }
712 }
713
714 static void refill_work(struct work_struct *work)
715 {
716 struct virtnet_info *vi =
717 container_of(work, struct virtnet_info, refill.work);
718 bool still_empty;
719 int i;
720
721 for (i = 0; i < vi->curr_queue_pairs; i++) {
722 struct receive_queue *rq = &vi->rq[i];
723
724 napi_disable(&rq->napi);
725 still_empty = !try_fill_recv(rq, GFP_KERNEL);
726 virtnet_napi_enable(rq);
727
728 /* In theory, this can happen: if we don't get any buffers in
729 * we will *never* try to fill again.
730 */
731 if (still_empty)
732 schedule_delayed_work(&vi->refill, HZ/2);
733 }
734 }
735
736 static int virtnet_receive(struct receive_queue *rq, int budget)
737 {
738 struct virtnet_info *vi = rq->vq->vdev->priv;
739 unsigned int len, received = 0;
740 void *buf;
741
742 while (received < budget &&
743 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
744 receive_buf(rq, buf, len);
745 received++;
746 }
747
748 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
749 if (!try_fill_recv(rq, GFP_ATOMIC))
750 schedule_delayed_work(&vi->refill, 0);
751 }
752
753 return received;
754 }
755
756 static int virtnet_poll(struct napi_struct *napi, int budget)
757 {
758 struct receive_queue *rq =
759 container_of(napi, struct receive_queue, napi);
760 unsigned int r, received = 0;
761
762 again:
763 received += virtnet_receive(rq, budget - received);
764
765 /* Out of packets? */
766 if (received < budget) {
767 r = virtqueue_enable_cb_prepare(rq->vq);
768 napi_complete(napi);
769 if (unlikely(virtqueue_poll(rq->vq, r)) &&
770 napi_schedule_prep(napi)) {
771 virtqueue_disable_cb(rq->vq);
772 __napi_schedule(napi);
773 goto again;
774 }
775 }
776
777 return received;
778 }
779
780 #ifdef CONFIG_NET_RX_BUSY_POLL
781 /* must be called with local_bh_disable()d */
782 static int virtnet_busy_poll(struct napi_struct *napi)
783 {
784 struct receive_queue *rq =
785 container_of(napi, struct receive_queue, napi);
786 struct virtnet_info *vi = rq->vq->vdev->priv;
787 int r, received = 0, budget = 4;
788
789 if (!(vi->status & VIRTIO_NET_S_LINK_UP))
790 return LL_FLUSH_FAILED;
791
792 if (!napi_schedule_prep(napi))
793 return LL_FLUSH_BUSY;
794
795 virtqueue_disable_cb(rq->vq);
796
797 again:
798 received += virtnet_receive(rq, budget);
799
800 r = virtqueue_enable_cb_prepare(rq->vq);
801 clear_bit(NAPI_STATE_SCHED, &napi->state);
802 if (unlikely(virtqueue_poll(rq->vq, r)) &&
803 napi_schedule_prep(napi)) {
804 virtqueue_disable_cb(rq->vq);
805 if (received < budget) {
806 budget -= received;
807 goto again;
808 } else {
809 __napi_schedule(napi);
810 }
811 }
812
813 return received;
814 }
815 #endif /* CONFIG_NET_RX_BUSY_POLL */
816
817 static int virtnet_open(struct net_device *dev)
818 {
819 struct virtnet_info *vi = netdev_priv(dev);
820 int i;
821
822 for (i = 0; i < vi->max_queue_pairs; i++) {
823 if (i < vi->curr_queue_pairs)
824 /* Make sure we have some buffers: if oom use wq. */
825 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
826 schedule_delayed_work(&vi->refill, 0);
827 virtnet_napi_enable(&vi->rq[i]);
828 }
829
830 return 0;
831 }
832
833 static void free_old_xmit_skbs(struct send_queue *sq)
834 {
835 struct sk_buff *skb;
836 unsigned int len;
837 struct virtnet_info *vi = sq->vq->vdev->priv;
838 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
839
840 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
841 pr_debug("Sent skb %p\n", skb);
842
843 u64_stats_update_begin(&stats->tx_syncp);
844 stats->tx_bytes += skb->len;
845 stats->tx_packets++;
846 u64_stats_update_end(&stats->tx_syncp);
847
848 dev_kfree_skb_any(skb);
849 }
850 }
851
852 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
853 {
854 struct skb_vnet_hdr *hdr;
855 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
856 struct virtnet_info *vi = sq->vq->vdev->priv;
857 unsigned num_sg;
858 unsigned hdr_len;
859 bool can_push;
860
861 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
862 if (vi->mergeable_rx_bufs)
863 hdr_len = sizeof hdr->mhdr;
864 else
865 hdr_len = sizeof hdr->hdr;
866
867 can_push = vi->any_header_sg &&
868 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
869 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
870 /* Even if we can, don't push here yet as this would skew
871 * csum_start offset below. */
872 if (can_push)
873 hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len);
874 else
875 hdr = skb_vnet_hdr(skb);
876
877 if (skb->ip_summed == CHECKSUM_PARTIAL) {
878 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
879 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
880 hdr->hdr.csum_offset = skb->csum_offset;
881 } else {
882 hdr->hdr.flags = 0;
883 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
884 }
885
886 if (skb_is_gso(skb)) {
887 hdr->hdr.hdr_len = skb_headlen(skb);
888 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
889 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
890 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
891 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
892 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
893 else
894 BUG();
895 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
896 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
897 } else {
898 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
899 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
900 }
901
902 if (vi->mergeable_rx_bufs)
903 hdr->mhdr.num_buffers = 0;
904
905 sg_init_table(sq->sg, MAX_SKB_FRAGS + 2);
906 if (can_push) {
907 __skb_push(skb, hdr_len);
908 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
909 /* Pull header back to avoid skew in tx bytes calculations. */
910 __skb_pull(skb, hdr_len);
911 } else {
912 sg_set_buf(sq->sg, hdr, hdr_len);
913 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
914 }
915 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
916 }
917
918 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
919 {
920 struct virtnet_info *vi = netdev_priv(dev);
921 int qnum = skb_get_queue_mapping(skb);
922 struct send_queue *sq = &vi->sq[qnum];
923 int err;
924 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
925 bool kick = !skb->xmit_more;
926
927 /* Free up any pending old buffers before queueing new ones. */
928 free_old_xmit_skbs(sq);
929
930 /* Try to transmit */
931 err = xmit_skb(sq, skb);
932
933 /* This should not happen! */
934 if (unlikely(err)) {
935 dev->stats.tx_fifo_errors++;
936 if (net_ratelimit())
937 dev_warn(&dev->dev,
938 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
939 dev->stats.tx_dropped++;
940 dev_kfree_skb_any(skb);
941 return NETDEV_TX_OK;
942 }
943
944 /* Don't wait up for transmitted skbs to be freed. */
945 skb_orphan(skb);
946 nf_reset(skb);
947
948 /* Apparently nice girls don't return TX_BUSY; stop the queue
949 * before it gets out of hand. Naturally, this wastes entries. */
950 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
951 netif_stop_subqueue(dev, qnum);
952 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
953 /* More just got used, free them then recheck. */
954 free_old_xmit_skbs(sq);
955 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
956 netif_start_subqueue(dev, qnum);
957 virtqueue_disable_cb(sq->vq);
958 }
959 }
960 }
961
962 if (kick || netif_xmit_stopped(txq))
963 virtqueue_kick(sq->vq);
964
965 return NETDEV_TX_OK;
966 }
967
968 /*
969 * Send command via the control virtqueue and check status. Commands
970 * supported by the hypervisor, as indicated by feature bits, should
971 * never fail unless improperly formatted.
972 */
973 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
974 struct scatterlist *out)
975 {
976 struct scatterlist *sgs[4], hdr, stat;
977 struct virtio_net_ctrl_hdr ctrl;
978 virtio_net_ctrl_ack status = ~0;
979 unsigned out_num = 0, tmp;
980
981 /* Caller should know better */
982 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
983
984 ctrl.class = class;
985 ctrl.cmd = cmd;
986 /* Add header */
987 sg_init_one(&hdr, &ctrl, sizeof(ctrl));
988 sgs[out_num++] = &hdr;
989
990 if (out)
991 sgs[out_num++] = out;
992
993 /* Add return status. */
994 sg_init_one(&stat, &status, sizeof(status));
995 sgs[out_num] = &stat;
996
997 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
998 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
999
1000 if (unlikely(!virtqueue_kick(vi->cvq)))
1001 return status == VIRTIO_NET_OK;
1002
1003 /* Spin for a response, the kick causes an ioport write, trapping
1004 * into the hypervisor, so the request should be handled immediately.
1005 */
1006 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1007 !virtqueue_is_broken(vi->cvq))
1008 cpu_relax();
1009
1010 return status == VIRTIO_NET_OK;
1011 }
1012
1013 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1014 {
1015 struct virtnet_info *vi = netdev_priv(dev);
1016 struct virtio_device *vdev = vi->vdev;
1017 int ret;
1018 struct sockaddr *addr = p;
1019 struct scatterlist sg;
1020
1021 ret = eth_prepare_mac_addr_change(dev, p);
1022 if (ret)
1023 return ret;
1024
1025 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1026 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1027 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1028 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1029 dev_warn(&vdev->dev,
1030 "Failed to set mac address by vq command.\n");
1031 return -EINVAL;
1032 }
1033 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
1034 unsigned int i;
1035
1036 /* Naturally, this has an atomicity problem. */
1037 for (i = 0; i < dev->addr_len; i++)
1038 virtio_cwrite8(vdev,
1039 offsetof(struct virtio_net_config, mac) +
1040 i, addr->sa_data[i]);
1041 }
1042
1043 eth_commit_mac_addr_change(dev, p);
1044
1045 return 0;
1046 }
1047
1048 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
1049 struct rtnl_link_stats64 *tot)
1050 {
1051 struct virtnet_info *vi = netdev_priv(dev);
1052 int cpu;
1053 unsigned int start;
1054
1055 for_each_possible_cpu(cpu) {
1056 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
1057 u64 tpackets, tbytes, rpackets, rbytes;
1058
1059 do {
1060 start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
1061 tpackets = stats->tx_packets;
1062 tbytes = stats->tx_bytes;
1063 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
1064
1065 do {
1066 start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
1067 rpackets = stats->rx_packets;
1068 rbytes = stats->rx_bytes;
1069 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
1070
1071 tot->rx_packets += rpackets;
1072 tot->tx_packets += tpackets;
1073 tot->rx_bytes += rbytes;
1074 tot->tx_bytes += tbytes;
1075 }
1076
1077 tot->tx_dropped = dev->stats.tx_dropped;
1078 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1079 tot->rx_dropped = dev->stats.rx_dropped;
1080 tot->rx_length_errors = dev->stats.rx_length_errors;
1081 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1082
1083 return tot;
1084 }
1085
1086 #ifdef CONFIG_NET_POLL_CONTROLLER
1087 static void virtnet_netpoll(struct net_device *dev)
1088 {
1089 struct virtnet_info *vi = netdev_priv(dev);
1090 int i;
1091
1092 for (i = 0; i < vi->curr_queue_pairs; i++)
1093 napi_schedule(&vi->rq[i].napi);
1094 }
1095 #endif
1096
1097 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1098 {
1099 rtnl_lock();
1100 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1101 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1102 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1103 rtnl_unlock();
1104 }
1105
1106 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1107 {
1108 struct scatterlist sg;
1109 struct virtio_net_ctrl_mq s;
1110 struct net_device *dev = vi->dev;
1111
1112 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1113 return 0;
1114
1115 s.virtqueue_pairs = queue_pairs;
1116 sg_init_one(&sg, &s, sizeof(s));
1117
1118 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1119 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1120 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1121 queue_pairs);
1122 return -EINVAL;
1123 } else {
1124 vi->curr_queue_pairs = queue_pairs;
1125 /* virtnet_open() will refill when device is going to up. */
1126 if (dev->flags & IFF_UP)
1127 schedule_delayed_work(&vi->refill, 0);
1128 }
1129
1130 return 0;
1131 }
1132
1133 static int virtnet_close(struct net_device *dev)
1134 {
1135 struct virtnet_info *vi = netdev_priv(dev);
1136 int i;
1137
1138 /* Make sure refill_work doesn't re-enable napi! */
1139 cancel_delayed_work_sync(&vi->refill);
1140
1141 for (i = 0; i < vi->max_queue_pairs; i++)
1142 napi_disable(&vi->rq[i].napi);
1143
1144 return 0;
1145 }
1146
1147 static void virtnet_set_rx_mode(struct net_device *dev)
1148 {
1149 struct virtnet_info *vi = netdev_priv(dev);
1150 struct scatterlist sg[2];
1151 u8 promisc, allmulti;
1152 struct virtio_net_ctrl_mac *mac_data;
1153 struct netdev_hw_addr *ha;
1154 int uc_count;
1155 int mc_count;
1156 void *buf;
1157 int i;
1158
1159 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1160 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1161 return;
1162
1163 promisc = ((dev->flags & IFF_PROMISC) != 0);
1164 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1165
1166 sg_init_one(sg, &promisc, sizeof(promisc));
1167
1168 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1169 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1170 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1171 promisc ? "en" : "dis");
1172
1173 sg_init_one(sg, &allmulti, sizeof(allmulti));
1174
1175 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1176 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1177 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1178 allmulti ? "en" : "dis");
1179
1180 uc_count = netdev_uc_count(dev);
1181 mc_count = netdev_mc_count(dev);
1182 /* MAC filter - use one buffer for both lists */
1183 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1184 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1185 mac_data = buf;
1186 if (!buf)
1187 return;
1188
1189 sg_init_table(sg, 2);
1190
1191 /* Store the unicast list and count in the front of the buffer */
1192 mac_data->entries = uc_count;
1193 i = 0;
1194 netdev_for_each_uc_addr(ha, dev)
1195 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1196
1197 sg_set_buf(&sg[0], mac_data,
1198 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1199
1200 /* multicast list and count fill the end */
1201 mac_data = (void *)&mac_data->macs[uc_count][0];
1202
1203 mac_data->entries = mc_count;
1204 i = 0;
1205 netdev_for_each_mc_addr(ha, dev)
1206 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1207
1208 sg_set_buf(&sg[1], mac_data,
1209 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1210
1211 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1212 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1213 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1214
1215 kfree(buf);
1216 }
1217
1218 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1219 __be16 proto, u16 vid)
1220 {
1221 struct virtnet_info *vi = netdev_priv(dev);
1222 struct scatterlist sg;
1223
1224 sg_init_one(&sg, &vid, sizeof(vid));
1225
1226 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1227 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1228 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1229 return 0;
1230 }
1231
1232 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1233 __be16 proto, u16 vid)
1234 {
1235 struct virtnet_info *vi = netdev_priv(dev);
1236 struct scatterlist sg;
1237
1238 sg_init_one(&sg, &vid, sizeof(vid));
1239
1240 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1241 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1242 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1243 return 0;
1244 }
1245
1246 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1247 {
1248 int i;
1249
1250 if (vi->affinity_hint_set) {
1251 for (i = 0; i < vi->max_queue_pairs; i++) {
1252 virtqueue_set_affinity(vi->rq[i].vq, -1);
1253 virtqueue_set_affinity(vi->sq[i].vq, -1);
1254 }
1255
1256 vi->affinity_hint_set = false;
1257 }
1258 }
1259
1260 static void virtnet_set_affinity(struct virtnet_info *vi)
1261 {
1262 int i;
1263 int cpu;
1264
1265 /* In multiqueue mode, when the number of cpu is equal to the number of
1266 * queue pairs, we let the queue pairs to be private to one cpu by
1267 * setting the affinity hint to eliminate the contention.
1268 */
1269 if (vi->curr_queue_pairs == 1 ||
1270 vi->max_queue_pairs != num_online_cpus()) {
1271 virtnet_clean_affinity(vi, -1);
1272 return;
1273 }
1274
1275 i = 0;
1276 for_each_online_cpu(cpu) {
1277 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1278 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1279 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1280 i++;
1281 }
1282
1283 vi->affinity_hint_set = true;
1284 }
1285
1286 static int virtnet_cpu_callback(struct notifier_block *nfb,
1287 unsigned long action, void *hcpu)
1288 {
1289 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
1290
1291 switch(action & ~CPU_TASKS_FROZEN) {
1292 case CPU_ONLINE:
1293 case CPU_DOWN_FAILED:
1294 case CPU_DEAD:
1295 virtnet_set_affinity(vi);
1296 break;
1297 case CPU_DOWN_PREPARE:
1298 virtnet_clean_affinity(vi, (long)hcpu);
1299 break;
1300 default:
1301 break;
1302 }
1303
1304 return NOTIFY_OK;
1305 }
1306
1307 static void virtnet_get_ringparam(struct net_device *dev,
1308 struct ethtool_ringparam *ring)
1309 {
1310 struct virtnet_info *vi = netdev_priv(dev);
1311
1312 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1313 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1314 ring->rx_pending = ring->rx_max_pending;
1315 ring->tx_pending = ring->tx_max_pending;
1316 }
1317
1318
1319 static void virtnet_get_drvinfo(struct net_device *dev,
1320 struct ethtool_drvinfo *info)
1321 {
1322 struct virtnet_info *vi = netdev_priv(dev);
1323 struct virtio_device *vdev = vi->vdev;
1324
1325 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1326 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1327 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1328
1329 }
1330
1331 /* TODO: Eliminate OOO packets during switching */
1332 static int virtnet_set_channels(struct net_device *dev,
1333 struct ethtool_channels *channels)
1334 {
1335 struct virtnet_info *vi = netdev_priv(dev);
1336 u16 queue_pairs = channels->combined_count;
1337 int err;
1338
1339 /* We don't support separate rx/tx channels.
1340 * We don't allow setting 'other' channels.
1341 */
1342 if (channels->rx_count || channels->tx_count || channels->other_count)
1343 return -EINVAL;
1344
1345 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1346 return -EINVAL;
1347
1348 get_online_cpus();
1349 err = virtnet_set_queues(vi, queue_pairs);
1350 if (!err) {
1351 netif_set_real_num_tx_queues(dev, queue_pairs);
1352 netif_set_real_num_rx_queues(dev, queue_pairs);
1353
1354 virtnet_set_affinity(vi);
1355 }
1356 put_online_cpus();
1357
1358 return err;
1359 }
1360
1361 static void virtnet_get_channels(struct net_device *dev,
1362 struct ethtool_channels *channels)
1363 {
1364 struct virtnet_info *vi = netdev_priv(dev);
1365
1366 channels->combined_count = vi->curr_queue_pairs;
1367 channels->max_combined = vi->max_queue_pairs;
1368 channels->max_other = 0;
1369 channels->rx_count = 0;
1370 channels->tx_count = 0;
1371 channels->other_count = 0;
1372 }
1373
1374 static const struct ethtool_ops virtnet_ethtool_ops = {
1375 .get_drvinfo = virtnet_get_drvinfo,
1376 .get_link = ethtool_op_get_link,
1377 .get_ringparam = virtnet_get_ringparam,
1378 .set_channels = virtnet_set_channels,
1379 .get_channels = virtnet_get_channels,
1380 };
1381
1382 #define MIN_MTU 68
1383 #define MAX_MTU 65535
1384
1385 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1386 {
1387 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1388 return -EINVAL;
1389 dev->mtu = new_mtu;
1390 return 0;
1391 }
1392
1393 static const struct net_device_ops virtnet_netdev = {
1394 .ndo_open = virtnet_open,
1395 .ndo_stop = virtnet_close,
1396 .ndo_start_xmit = start_xmit,
1397 .ndo_validate_addr = eth_validate_addr,
1398 .ndo_set_mac_address = virtnet_set_mac_address,
1399 .ndo_set_rx_mode = virtnet_set_rx_mode,
1400 .ndo_change_mtu = virtnet_change_mtu,
1401 .ndo_get_stats64 = virtnet_stats,
1402 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1403 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1404 #ifdef CONFIG_NET_POLL_CONTROLLER
1405 .ndo_poll_controller = virtnet_netpoll,
1406 #endif
1407 #ifdef CONFIG_NET_RX_BUSY_POLL
1408 .ndo_busy_poll = virtnet_busy_poll,
1409 #endif
1410 };
1411
1412 static void virtnet_config_changed_work(struct work_struct *work)
1413 {
1414 struct virtnet_info *vi =
1415 container_of(work, struct virtnet_info, config_work);
1416 u16 v;
1417
1418 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
1419 struct virtio_net_config, status, &v) < 0)
1420 return;
1421
1422 if (v & VIRTIO_NET_S_ANNOUNCE) {
1423 netdev_notify_peers(vi->dev);
1424 virtnet_ack_link_announce(vi);
1425 }
1426
1427 /* Ignore unknown (future) status bits */
1428 v &= VIRTIO_NET_S_LINK_UP;
1429
1430 if (vi->status == v)
1431 return;
1432
1433 vi->status = v;
1434
1435 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1436 netif_carrier_on(vi->dev);
1437 netif_tx_wake_all_queues(vi->dev);
1438 } else {
1439 netif_carrier_off(vi->dev);
1440 netif_tx_stop_all_queues(vi->dev);
1441 }
1442 }
1443
1444 static void virtnet_config_changed(struct virtio_device *vdev)
1445 {
1446 struct virtnet_info *vi = vdev->priv;
1447
1448 schedule_work(&vi->config_work);
1449 }
1450
1451 static void virtnet_free_queues(struct virtnet_info *vi)
1452 {
1453 int i;
1454
1455 for (i = 0; i < vi->max_queue_pairs; i++) {
1456 napi_hash_del(&vi->rq[i].napi);
1457 netif_napi_del(&vi->rq[i].napi);
1458 }
1459
1460 kfree(vi->rq);
1461 kfree(vi->sq);
1462 }
1463
1464 static void free_receive_bufs(struct virtnet_info *vi)
1465 {
1466 int i;
1467
1468 for (i = 0; i < vi->max_queue_pairs; i++) {
1469 while (vi->rq[i].pages)
1470 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1471 }
1472 }
1473
1474 static void free_receive_page_frags(struct virtnet_info *vi)
1475 {
1476 int i;
1477 for (i = 0; i < vi->max_queue_pairs; i++)
1478 if (vi->rq[i].alloc_frag.page)
1479 put_page(vi->rq[i].alloc_frag.page);
1480 }
1481
1482 static void free_unused_bufs(struct virtnet_info *vi)
1483 {
1484 void *buf;
1485 int i;
1486
1487 for (i = 0; i < vi->max_queue_pairs; i++) {
1488 struct virtqueue *vq = vi->sq[i].vq;
1489 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1490 dev_kfree_skb(buf);
1491 }
1492
1493 for (i = 0; i < vi->max_queue_pairs; i++) {
1494 struct virtqueue *vq = vi->rq[i].vq;
1495
1496 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1497 if (vi->mergeable_rx_bufs) {
1498 unsigned long ctx = (unsigned long)buf;
1499 void *base = mergeable_ctx_to_buf_address(ctx);
1500 put_page(virt_to_head_page(base));
1501 } else if (vi->big_packets) {
1502 give_pages(&vi->rq[i], buf);
1503 } else {
1504 dev_kfree_skb(buf);
1505 }
1506 }
1507 }
1508 }
1509
1510 static void virtnet_del_vqs(struct virtnet_info *vi)
1511 {
1512 struct virtio_device *vdev = vi->vdev;
1513
1514 virtnet_clean_affinity(vi, -1);
1515
1516 vdev->config->del_vqs(vdev);
1517
1518 virtnet_free_queues(vi);
1519 }
1520
1521 static int virtnet_find_vqs(struct virtnet_info *vi)
1522 {
1523 vq_callback_t **callbacks;
1524 struct virtqueue **vqs;
1525 int ret = -ENOMEM;
1526 int i, total_vqs;
1527 const char **names;
1528
1529 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1530 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1531 * possible control vq.
1532 */
1533 total_vqs = vi->max_queue_pairs * 2 +
1534 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1535
1536 /* Allocate space for find_vqs parameters */
1537 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1538 if (!vqs)
1539 goto err_vq;
1540 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1541 if (!callbacks)
1542 goto err_callback;
1543 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1544 if (!names)
1545 goto err_names;
1546
1547 /* Parameters for control virtqueue, if any */
1548 if (vi->has_cvq) {
1549 callbacks[total_vqs - 1] = NULL;
1550 names[total_vqs - 1] = "control";
1551 }
1552
1553 /* Allocate/initialize parameters for send/receive virtqueues */
1554 for (i = 0; i < vi->max_queue_pairs; i++) {
1555 callbacks[rxq2vq(i)] = skb_recv_done;
1556 callbacks[txq2vq(i)] = skb_xmit_done;
1557 sprintf(vi->rq[i].name, "input.%d", i);
1558 sprintf(vi->sq[i].name, "output.%d", i);
1559 names[rxq2vq(i)] = vi->rq[i].name;
1560 names[txq2vq(i)] = vi->sq[i].name;
1561 }
1562
1563 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1564 names);
1565 if (ret)
1566 goto err_find;
1567
1568 if (vi->has_cvq) {
1569 vi->cvq = vqs[total_vqs - 1];
1570 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1571 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1572 }
1573
1574 for (i = 0; i < vi->max_queue_pairs; i++) {
1575 vi->rq[i].vq = vqs[rxq2vq(i)];
1576 vi->sq[i].vq = vqs[txq2vq(i)];
1577 }
1578
1579 kfree(names);
1580 kfree(callbacks);
1581 kfree(vqs);
1582
1583 return 0;
1584
1585 err_find:
1586 kfree(names);
1587 err_names:
1588 kfree(callbacks);
1589 err_callback:
1590 kfree(vqs);
1591 err_vq:
1592 return ret;
1593 }
1594
1595 static int virtnet_alloc_queues(struct virtnet_info *vi)
1596 {
1597 int i;
1598
1599 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1600 if (!vi->sq)
1601 goto err_sq;
1602 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1603 if (!vi->rq)
1604 goto err_rq;
1605
1606 INIT_DELAYED_WORK(&vi->refill, refill_work);
1607 for (i = 0; i < vi->max_queue_pairs; i++) {
1608 vi->rq[i].pages = NULL;
1609 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1610 napi_weight);
1611 napi_hash_add(&vi->rq[i].napi);
1612
1613 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1614 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT);
1615 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1616 }
1617
1618 return 0;
1619
1620 err_rq:
1621 kfree(vi->sq);
1622 err_sq:
1623 return -ENOMEM;
1624 }
1625
1626 static int init_vqs(struct virtnet_info *vi)
1627 {
1628 int ret;
1629
1630 /* Allocate send & receive queues */
1631 ret = virtnet_alloc_queues(vi);
1632 if (ret)
1633 goto err;
1634
1635 ret = virtnet_find_vqs(vi);
1636 if (ret)
1637 goto err_free;
1638
1639 get_online_cpus();
1640 virtnet_set_affinity(vi);
1641 put_online_cpus();
1642
1643 return 0;
1644
1645 err_free:
1646 virtnet_free_queues(vi);
1647 err:
1648 return ret;
1649 }
1650
1651 #ifdef CONFIG_SYSFS
1652 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
1653 struct rx_queue_attribute *attribute, char *buf)
1654 {
1655 struct virtnet_info *vi = netdev_priv(queue->dev);
1656 unsigned int queue_index = get_netdev_rx_queue_index(queue);
1657 struct ewma *avg;
1658
1659 BUG_ON(queue_index >= vi->max_queue_pairs);
1660 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
1661 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
1662 }
1663
1664 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
1665 __ATTR_RO(mergeable_rx_buffer_size);
1666
1667 static struct attribute *virtio_net_mrg_rx_attrs[] = {
1668 &mergeable_rx_buffer_size_attribute.attr,
1669 NULL
1670 };
1671
1672 static const struct attribute_group virtio_net_mrg_rx_group = {
1673 .name = "virtio_net",
1674 .attrs = virtio_net_mrg_rx_attrs
1675 };
1676 #endif
1677
1678 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
1679 unsigned int fbit,
1680 const char *fname, const char *dname)
1681 {
1682 if (!virtio_has_feature(vdev, fbit))
1683 return false;
1684
1685 dev_err(&vdev->dev, "device advertises feature %s but not %s",
1686 fname, dname);
1687
1688 return true;
1689 }
1690
1691 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
1692 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
1693
1694 static bool virtnet_validate_features(struct virtio_device *vdev)
1695 {
1696 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
1697 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
1698 "VIRTIO_NET_F_CTRL_VQ") ||
1699 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
1700 "VIRTIO_NET_F_CTRL_VQ") ||
1701 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
1702 "VIRTIO_NET_F_CTRL_VQ") ||
1703 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
1704 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
1705 "VIRTIO_NET_F_CTRL_VQ"))) {
1706 return false;
1707 }
1708
1709 return true;
1710 }
1711
1712 static int virtnet_probe(struct virtio_device *vdev)
1713 {
1714 int i, err;
1715 struct net_device *dev;
1716 struct virtnet_info *vi;
1717 u16 max_queue_pairs;
1718
1719 if (!virtnet_validate_features(vdev))
1720 return -EINVAL;
1721
1722 /* Find if host supports multiqueue virtio_net device */
1723 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
1724 struct virtio_net_config,
1725 max_virtqueue_pairs, &max_queue_pairs);
1726
1727 /* We need at least 2 queue's */
1728 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1729 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1730 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1731 max_queue_pairs = 1;
1732
1733 /* Allocate ourselves a network device with room for our info */
1734 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1735 if (!dev)
1736 return -ENOMEM;
1737
1738 /* Set up network device as normal. */
1739 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1740 dev->netdev_ops = &virtnet_netdev;
1741 dev->features = NETIF_F_HIGHDMA;
1742
1743 dev->ethtool_ops = &virtnet_ethtool_ops;
1744 SET_NETDEV_DEV(dev, &vdev->dev);
1745
1746 /* Do we support "hardware" checksums? */
1747 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1748 /* This opens up the world of extra features. */
1749 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
1750 if (csum)
1751 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
1752
1753 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1754 dev->hw_features |= NETIF_F_TSO
1755 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1756 }
1757 /* Individual feature bits: what can host handle? */
1758 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1759 dev->hw_features |= NETIF_F_TSO;
1760 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1761 dev->hw_features |= NETIF_F_TSO6;
1762 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1763 dev->hw_features |= NETIF_F_TSO_ECN;
1764
1765 if (gso)
1766 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
1767 /* (!csum && gso) case will be fixed by register_netdev() */
1768 }
1769 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
1770 dev->features |= NETIF_F_RXCSUM;
1771
1772 dev->vlan_features = dev->features;
1773
1774 /* Configuration may specify what MAC to use. Otherwise random. */
1775 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
1776 virtio_cread_bytes(vdev,
1777 offsetof(struct virtio_net_config, mac),
1778 dev->dev_addr, dev->addr_len);
1779 else
1780 eth_hw_addr_random(dev);
1781
1782 /* Set up our device-specific information */
1783 vi = netdev_priv(dev);
1784 vi->dev = dev;
1785 vi->vdev = vdev;
1786 vdev->priv = vi;
1787 vi->stats = alloc_percpu(struct virtnet_stats);
1788 err = -ENOMEM;
1789 if (vi->stats == NULL)
1790 goto free;
1791
1792 for_each_possible_cpu(i) {
1793 struct virtnet_stats *virtnet_stats;
1794 virtnet_stats = per_cpu_ptr(vi->stats, i);
1795 u64_stats_init(&virtnet_stats->tx_syncp);
1796 u64_stats_init(&virtnet_stats->rx_syncp);
1797 }
1798
1799 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1800
1801 /* If we can receive ANY GSO packets, we must allocate large ones. */
1802 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1803 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1804 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1805 vi->big_packets = true;
1806
1807 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1808 vi->mergeable_rx_bufs = true;
1809
1810 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT))
1811 vi->any_header_sg = true;
1812
1813 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1814 vi->has_cvq = true;
1815
1816 if (vi->any_header_sg) {
1817 if (vi->mergeable_rx_bufs)
1818 dev->needed_headroom = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1819 else
1820 dev->needed_headroom = sizeof(struct virtio_net_hdr);
1821 }
1822
1823 /* Use single tx/rx queue pair as default */
1824 vi->curr_queue_pairs = 1;
1825 vi->max_queue_pairs = max_queue_pairs;
1826
1827 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1828 err = init_vqs(vi);
1829 if (err)
1830 goto free_stats;
1831
1832 #ifdef CONFIG_SYSFS
1833 if (vi->mergeable_rx_bufs)
1834 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
1835 #endif
1836 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
1837 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
1838
1839 err = register_netdev(dev);
1840 if (err) {
1841 pr_debug("virtio_net: registering device failed\n");
1842 goto free_vqs;
1843 }
1844
1845 virtio_device_ready(vdev);
1846
1847 /* Last of all, set up some receive buffers. */
1848 for (i = 0; i < vi->curr_queue_pairs; i++) {
1849 try_fill_recv(&vi->rq[i], GFP_KERNEL);
1850
1851 /* If we didn't even get one input buffer, we're useless. */
1852 if (vi->rq[i].vq->num_free ==
1853 virtqueue_get_vring_size(vi->rq[i].vq)) {
1854 free_unused_bufs(vi);
1855 err = -ENOMEM;
1856 goto free_recv_bufs;
1857 }
1858 }
1859
1860 vi->nb.notifier_call = &virtnet_cpu_callback;
1861 err = register_hotcpu_notifier(&vi->nb);
1862 if (err) {
1863 pr_debug("virtio_net: registering cpu notifier failed\n");
1864 goto free_recv_bufs;
1865 }
1866
1867 /* Assume link up if device can't report link status,
1868 otherwise get link status from config. */
1869 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1870 netif_carrier_off(dev);
1871 schedule_work(&vi->config_work);
1872 } else {
1873 vi->status = VIRTIO_NET_S_LINK_UP;
1874 netif_carrier_on(dev);
1875 }
1876
1877 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1878 dev->name, max_queue_pairs);
1879
1880 return 0;
1881
1882 free_recv_bufs:
1883 vi->vdev->config->reset(vdev);
1884
1885 free_receive_bufs(vi);
1886 unregister_netdev(dev);
1887 free_vqs:
1888 cancel_delayed_work_sync(&vi->refill);
1889 free_receive_page_frags(vi);
1890 virtnet_del_vqs(vi);
1891 free_stats:
1892 free_percpu(vi->stats);
1893 free:
1894 free_netdev(dev);
1895 return err;
1896 }
1897
1898 static void remove_vq_common(struct virtnet_info *vi)
1899 {
1900 vi->vdev->config->reset(vi->vdev);
1901
1902 /* Free unused buffers in both send and recv, if any. */
1903 free_unused_bufs(vi);
1904
1905 free_receive_bufs(vi);
1906
1907 free_receive_page_frags(vi);
1908
1909 virtnet_del_vqs(vi);
1910 }
1911
1912 static void virtnet_remove(struct virtio_device *vdev)
1913 {
1914 struct virtnet_info *vi = vdev->priv;
1915
1916 unregister_hotcpu_notifier(&vi->nb);
1917
1918 /* Make sure no work handler is accessing the device. */
1919 flush_work(&vi->config_work);
1920
1921 unregister_netdev(vi->dev);
1922
1923 remove_vq_common(vi);
1924
1925 free_percpu(vi->stats);
1926 free_netdev(vi->dev);
1927 }
1928
1929 #ifdef CONFIG_PM_SLEEP
1930 static int virtnet_freeze(struct virtio_device *vdev)
1931 {
1932 struct virtnet_info *vi = vdev->priv;
1933 int i;
1934
1935 unregister_hotcpu_notifier(&vi->nb);
1936
1937 /* Make sure no work handler is accessing the device */
1938 flush_work(&vi->config_work);
1939
1940 netif_device_detach(vi->dev);
1941 cancel_delayed_work_sync(&vi->refill);
1942
1943 if (netif_running(vi->dev)) {
1944 for (i = 0; i < vi->max_queue_pairs; i++)
1945 napi_disable(&vi->rq[i].napi);
1946 }
1947
1948 remove_vq_common(vi);
1949
1950 return 0;
1951 }
1952
1953 static int virtnet_restore(struct virtio_device *vdev)
1954 {
1955 struct virtnet_info *vi = vdev->priv;
1956 int err, i;
1957
1958 err = init_vqs(vi);
1959 if (err)
1960 return err;
1961
1962 virtio_device_ready(vdev);
1963
1964 if (netif_running(vi->dev)) {
1965 for (i = 0; i < vi->curr_queue_pairs; i++)
1966 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
1967 schedule_delayed_work(&vi->refill, 0);
1968
1969 for (i = 0; i < vi->max_queue_pairs; i++)
1970 virtnet_napi_enable(&vi->rq[i]);
1971 }
1972
1973 netif_device_attach(vi->dev);
1974
1975 rtnl_lock();
1976 virtnet_set_queues(vi, vi->curr_queue_pairs);
1977 rtnl_unlock();
1978
1979 err = register_hotcpu_notifier(&vi->nb);
1980 if (err)
1981 return err;
1982
1983 return 0;
1984 }
1985 #endif
1986
1987 static struct virtio_device_id id_table[] = {
1988 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1989 { 0 },
1990 };
1991
1992 static unsigned int features[] = {
1993 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1994 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1995 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_TSO6,
1996 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1997 VIRTIO_NET_F_GUEST_ECN,
1998 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1999 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
2000 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
2001 VIRTIO_NET_F_CTRL_MAC_ADDR,
2002 VIRTIO_F_ANY_LAYOUT,
2003 };
2004
2005 static struct virtio_driver virtio_net_driver = {
2006 .feature_table = features,
2007 .feature_table_size = ARRAY_SIZE(features),
2008 .driver.name = KBUILD_MODNAME,
2009 .driver.owner = THIS_MODULE,
2010 .id_table = id_table,
2011 .probe = virtnet_probe,
2012 .remove = virtnet_remove,
2013 .config_changed = virtnet_config_changed,
2014 #ifdef CONFIG_PM_SLEEP
2015 .freeze = virtnet_freeze,
2016 .restore = virtnet_restore,
2017 #endif
2018 };
2019
2020 module_virtio_driver(virtio_net_driver);
2021
2022 MODULE_DEVICE_TABLE(virtio, id_table);
2023 MODULE_DESCRIPTION("Virtio network driver");
2024 MODULE_LICENSE("GPL");
Linux with added FPC-III support