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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
32static int napi_weight = NAPI_POLL_WEIGHT;
33module_param(napi_weight, int, 0444);
34
35static bool csum = true, gso = true;
36module_param(csum, bool, 0444);
37module_param(gso, bool, 0444);
38
39
40#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
41#define GOOD_COPY_LEN 128
42
43
44
45
46
47
48#define RECEIVE_AVG_WEIGHT 64
49
50
51#define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256)
52
53#define VIRTNET_DRIVER_VERSION "1.0.0"
54
55struct 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
66struct send_queue {
67
68 struct virtqueue *vq;
69
70
71 struct scatterlist sg[MAX_SKB_FRAGS + 2];
72
73
74 char name[40];
75};
76
77
78struct receive_queue {
79
80 struct virtqueue *vq;
81
82 struct napi_struct napi;
83
84
85 struct page *pages;
86
87
88 struct ewma mrg_avg_pkt_len;
89
90
91 struct page_frag alloc_frag;
92
93
94 struct scatterlist sg[MAX_SKB_FRAGS + 2];
95
96
97 char name[40];
98};
99
100struct 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
109 u16 max_queue_pairs;
110
111
112 u16 curr_queue_pairs;
113
114
115 bool big_packets;
116
117
118 bool mergeable_rx_bufs;
119
120
121 bool has_cvq;
122
123
124 bool any_header_sg;
125
126
127 u8 hdr_len;
128
129
130 struct virtnet_stats __percpu *stats;
131
132
133 struct delayed_work refill;
134
135
136 struct work_struct config_work;
137
138
139 bool affinity_hint_set;
140
141
142 struct notifier_block nb;
143};
144
145struct padded_vnet_hdr {
146 struct virtio_net_hdr_mrg_rxbuf hdr;
147
148
149
150
151
152 char padding[4];
153};
154
155
156
157
158static int vq2txq(struct virtqueue *vq)
159{
160 return (vq->index - 1) / 2;
161}
162
163static int txq2vq(int txq)
164{
165 return txq * 2 + 1;
166}
167
168static int vq2rxq(struct virtqueue *vq)
169{
170 return vq->index / 2;
171}
172
173static int rxq2vq(int rxq)
174{
175 return rxq * 2;
176}
177
178static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
179{
180 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
181}
182
183
184
185
186
187static void give_pages(struct receive_queue *rq, struct page *page)
188{
189 struct page *end;
190
191
192 for (end = page; end->private; end = (struct page *)end->private);
193 end->private = (unsigned long)rq->pages;
194 rq->pages = page;
195}
196
197static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
198{
199 struct page *p = rq->pages;
200
201 if (p) {
202 rq->pages = (struct page *)p->private;
203
204 p->private = 0;
205 } else
206 p = alloc_page(gfp_mask);
207 return p;
208}
209
210static void skb_xmit_done(struct virtqueue *vq)
211{
212 struct virtnet_info *vi = vq->vdev->priv;
213
214
215 virtqueue_disable_cb(vq);
216
217
218 netif_wake_subqueue(vi->dev, vq2txq(vq));
219}
220
221static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx)
222{
223 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1);
224 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN;
225}
226
227static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx)
228{
229 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN);
230
231}
232
233static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize)
234{
235 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN;
236 return (unsigned long)buf | (size - 1);
237}
238
239
240static struct sk_buff *page_to_skb(struct virtnet_info *vi,
241 struct receive_queue *rq,
242 struct page *page, unsigned int offset,
243 unsigned int len, unsigned int truesize)
244{
245 struct sk_buff *skb;
246 struct virtio_net_hdr_mrg_rxbuf *hdr;
247 unsigned int copy, hdr_len, hdr_padded_len;
248 char *p;
249
250 p = page_address(page) + offset;
251
252
253 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
254 if (unlikely(!skb))
255 return NULL;
256
257 hdr = skb_vnet_hdr(skb);
258
259 hdr_len = vi->hdr_len;
260 if (vi->mergeable_rx_bufs)
261 hdr_padded_len = sizeof *hdr;
262 else
263 hdr_padded_len = sizeof(struct padded_vnet_hdr);
264
265 memcpy(hdr, p, hdr_len);
266
267 len -= hdr_len;
268 offset += hdr_padded_len;
269 p += hdr_padded_len;
270
271 copy = len;
272 if (copy > skb_tailroom(skb))
273 copy = skb_tailroom(skb);
274 memcpy(skb_put(skb, copy), p, copy);
275
276 len -= copy;
277 offset += copy;
278
279 if (vi->mergeable_rx_bufs) {
280 if (len)
281 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
282 else
283 put_page(page);
284 return skb;
285 }
286
287
288
289
290
291
292
293 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
294 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
295 dev_kfree_skb(skb);
296 return NULL;
297 }
298 BUG_ON(offset >= PAGE_SIZE);
299 while (len) {
300 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
301 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
302 frag_size, truesize);
303 len -= frag_size;
304 page = (struct page *)page->private;
305 offset = 0;
306 }
307
308 if (page)
309 give_pages(rq, page);
310
311 return skb;
312}
313
314static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len)
315{
316 struct sk_buff * skb = buf;
317
318 len -= vi->hdr_len;
319 skb_trim(skb, len);
320
321 return skb;
322}
323
324static struct sk_buff *receive_big(struct net_device *dev,
325 struct virtnet_info *vi,
326 struct receive_queue *rq,
327 void *buf,
328 unsigned int len)
329{
330 struct page *page = buf;
331 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
332
333 if (unlikely(!skb))
334 goto err;
335
336 return skb;
337
338err:
339 dev->stats.rx_dropped++;
340 give_pages(rq, page);
341 return NULL;
342}
343
344static struct sk_buff *receive_mergeable(struct net_device *dev,
345 struct virtnet_info *vi,
346 struct receive_queue *rq,
347 unsigned long ctx,
348 unsigned int len)
349{
350 void *buf = mergeable_ctx_to_buf_address(ctx);
351 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
352 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
353 struct page *page = virt_to_head_page(buf);
354 int offset = buf - page_address(page);
355 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
356
357 struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len,
358 truesize);
359 struct sk_buff *curr_skb = head_skb;
360
361 if (unlikely(!curr_skb))
362 goto err_skb;
363 while (--num_buf) {
364 int num_skb_frags;
365
366 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
367 if (unlikely(!ctx)) {
368 pr_debug("%s: rx error: %d buffers out of %d missing\n",
369 dev->name, num_buf,
370 virtio16_to_cpu(vi->vdev,
371 hdr->num_buffers));
372 dev->stats.rx_length_errors++;
373 goto err_buf;
374 }
375
376 buf = mergeable_ctx_to_buf_address(ctx);
377 page = virt_to_head_page(buf);
378
379 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
380 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
381 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
382
383 if (unlikely(!nskb))
384 goto err_skb;
385 if (curr_skb == head_skb)
386 skb_shinfo(curr_skb)->frag_list = nskb;
387 else
388 curr_skb->next = nskb;
389 curr_skb = nskb;
390 head_skb->truesize += nskb->truesize;
391 num_skb_frags = 0;
392 }
393 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
394 if (curr_skb != head_skb) {
395 head_skb->data_len += len;
396 head_skb->len += len;
397 head_skb->truesize += truesize;
398 }
399 offset = buf - page_address(page);
400 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
401 put_page(page);
402 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
403 len, truesize);
404 } else {
405 skb_add_rx_frag(curr_skb, num_skb_frags, page,
406 offset, len, truesize);
407 }
408 }
409
410 ewma_add(&rq->mrg_avg_pkt_len, head_skb->len);
411 return head_skb;
412
413err_skb:
414 put_page(page);
415 while (--num_buf) {
416 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
417 if (unlikely(!ctx)) {
418 pr_debug("%s: rx error: %d buffers missing\n",
419 dev->name, num_buf);
420 dev->stats.rx_length_errors++;
421 break;
422 }
423 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
424 put_page(page);
425 }
426err_buf:
427 dev->stats.rx_dropped++;
428 dev_kfree_skb(head_skb);
429 return NULL;
430}
431
432static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
433 void *buf, unsigned int len)
434{
435 struct net_device *dev = vi->dev;
436 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
437 struct sk_buff *skb;
438 struct virtio_net_hdr_mrg_rxbuf *hdr;
439
440 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
441 pr_debug("%s: short packet %i\n", dev->name, len);
442 dev->stats.rx_length_errors++;
443 if (vi->mergeable_rx_bufs) {
444 unsigned long ctx = (unsigned long)buf;
445 void *base = mergeable_ctx_to_buf_address(ctx);
446 put_page(virt_to_head_page(base));
447 } else if (vi->big_packets) {
448 give_pages(rq, buf);
449 } else {
450 dev_kfree_skb(buf);
451 }
452 return;
453 }
454
455 if (vi->mergeable_rx_bufs)
456 skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
457 else if (vi->big_packets)
458 skb = receive_big(dev, vi, rq, buf, len);
459 else
460 skb = receive_small(vi, buf, len);
461
462 if (unlikely(!skb))
463 return;
464
465 hdr = skb_vnet_hdr(skb);
466
467 u64_stats_update_begin(&stats->rx_syncp);
468 stats->rx_bytes += skb->len;
469 stats->rx_packets++;
470 u64_stats_update_end(&stats->rx_syncp);
471
472 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
473 pr_debug("Needs csum!\n");
474 if (!skb_partial_csum_set(skb,
475 virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start),
476 virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset)))
477 goto frame_err;
478 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
479 skb->ip_summed = CHECKSUM_UNNECESSARY;
480 }
481
482 skb->protocol = eth_type_trans(skb, dev);
483 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
484 ntohs(skb->protocol), skb->len, skb->pkt_type);
485
486 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
487 pr_debug("GSO!\n");
488 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
489 case VIRTIO_NET_HDR_GSO_TCPV4:
490 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
491 break;
492 case VIRTIO_NET_HDR_GSO_UDP:
493 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
494 break;
495 case VIRTIO_NET_HDR_GSO_TCPV6:
496 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
497 break;
498 default:
499 net_warn_ratelimited("%s: bad gso type %u.\n",
500 dev->name, hdr->hdr.gso_type);
501 goto frame_err;
502 }
503
504 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
505 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
506
507 skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev,
508 hdr->hdr.gso_size);
509 if (skb_shinfo(skb)->gso_size == 0) {
510 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
511 goto frame_err;
512 }
513
514
515 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
516 skb_shinfo(skb)->gso_segs = 0;
517 }
518
519 skb_mark_napi_id(skb, &rq->napi);
520
521 netif_receive_skb(skb);
522 return;
523
524frame_err:
525 dev->stats.rx_frame_errors++;
526 dev_kfree_skb(skb);
527}
528
529static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
530 gfp_t gfp)
531{
532 struct sk_buff *skb;
533 struct virtio_net_hdr_mrg_rxbuf *hdr;
534 int err;
535
536 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
537 if (unlikely(!skb))
538 return -ENOMEM;
539
540 skb_put(skb, GOOD_PACKET_LEN);
541
542 hdr = skb_vnet_hdr(skb);
543 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
544 sg_set_buf(rq->sg, hdr, vi->hdr_len);
545 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
546
547 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
548 if (err < 0)
549 dev_kfree_skb(skb);
550
551 return err;
552}
553
554static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
555 gfp_t gfp)
556{
557 struct page *first, *list = NULL;
558 char *p;
559 int i, err, offset;
560
561 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
562
563
564 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
565 first = get_a_page(rq, gfp);
566 if (!first) {
567 if (list)
568 give_pages(rq, list);
569 return -ENOMEM;
570 }
571 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
572
573
574 first->private = (unsigned long)list;
575 list = first;
576 }
577
578 first = get_a_page(rq, gfp);
579 if (!first) {
580 give_pages(rq, list);
581 return -ENOMEM;
582 }
583 p = page_address(first);
584
585
586
587 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
588
589
590 offset = sizeof(struct padded_vnet_hdr);
591 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
592
593
594 first->private = (unsigned long)list;
595 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
596 first, gfp);
597 if (err < 0)
598 give_pages(rq, first);
599
600 return err;
601}
602
603static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len)
604{
605 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
606 unsigned int len;
607
608 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len),
609 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
610 return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
611}
612
613static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
614{
615 struct page_frag *alloc_frag = &rq->alloc_frag;
616 char *buf;
617 unsigned long ctx;
618 int err;
619 unsigned int len, hole;
620
621 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
622 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
623 return -ENOMEM;
624
625 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
626 ctx = mergeable_buf_to_ctx(buf, len);
627 get_page(alloc_frag->page);
628 alloc_frag->offset += len;
629 hole = alloc_frag->size - alloc_frag->offset;
630 if (hole < len) {
631
632
633
634
635
636 len += hole;
637 alloc_frag->offset += hole;
638 }
639
640 sg_init_one(rq->sg, buf, len);
641 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
642 if (err < 0)
643 put_page(virt_to_head_page(buf));
644
645 return err;
646}
647
648
649
650
651
652
653
654
655static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
656 gfp_t gfp)
657{
658 int err;
659 bool oom;
660
661 gfp |= __GFP_COLD;
662 do {
663 if (vi->mergeable_rx_bufs)
664 err = add_recvbuf_mergeable(rq, gfp);
665 else if (vi->big_packets)
666 err = add_recvbuf_big(vi, rq, gfp);
667 else
668 err = add_recvbuf_small(vi, rq, gfp);
669
670 oom = err == -ENOMEM;
671 if (err)
672 break;
673 } while (rq->vq->num_free);
674 virtqueue_kick(rq->vq);
675 return !oom;
676}
677
678static void skb_recv_done(struct virtqueue *rvq)
679{
680 struct virtnet_info *vi = rvq->vdev->priv;
681 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
682
683
684 if (napi_schedule_prep(&rq->napi)) {
685 virtqueue_disable_cb(rvq);
686 __napi_schedule(&rq->napi);
687 }
688}
689
690static void virtnet_napi_enable(struct receive_queue *rq)
691{
692 napi_enable(&rq->napi);
693
694
695
696
697
698 if (napi_schedule_prep(&rq->napi)) {
699 virtqueue_disable_cb(rq->vq);
700 local_bh_disable();
701 __napi_schedule(&rq->napi);
702 local_bh_enable();
703 }
704}
705
706static void refill_work(struct work_struct *work)
707{
708 struct virtnet_info *vi =
709 container_of(work, struct virtnet_info, refill.work);
710 bool still_empty;
711 int i;
712
713 for (i = 0; i < vi->curr_queue_pairs; i++) {
714 struct receive_queue *rq = &vi->rq[i];
715
716 napi_disable(&rq->napi);
717 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
718 virtnet_napi_enable(rq);
719
720
721
722
723 if (still_empty)
724 schedule_delayed_work(&vi->refill, HZ/2);
725 }
726}
727
728static int virtnet_receive(struct receive_queue *rq, int budget)
729{
730 struct virtnet_info *vi = rq->vq->vdev->priv;
731 unsigned int len, received = 0;
732 void *buf;
733
734 while (received < budget &&
735 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
736 receive_buf(vi, rq, buf, len);
737 received++;
738 }
739
740 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
741 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
742 schedule_delayed_work(&vi->refill, 0);
743 }
744
745 return received;
746}
747
748static int virtnet_poll(struct napi_struct *napi, int budget)
749{
750 struct receive_queue *rq =
751 container_of(napi, struct receive_queue, napi);
752 unsigned int r, received;
753
754 received = virtnet_receive(rq, budget);
755
756
757 if (received < budget) {
758 r = virtqueue_enable_cb_prepare(rq->vq);
759 napi_complete(napi);
760 if (unlikely(virtqueue_poll(rq->vq, r)) &&
761 napi_schedule_prep(napi)) {
762 virtqueue_disable_cb(rq->vq);
763 __napi_schedule(napi);
764 }
765 }
766
767 return received;
768}
769
770#ifdef CONFIG_NET_RX_BUSY_POLL
771
772static int virtnet_busy_poll(struct napi_struct *napi)
773{
774 struct receive_queue *rq =
775 container_of(napi, struct receive_queue, napi);
776 struct virtnet_info *vi = rq->vq->vdev->priv;
777 int r, received = 0, budget = 4;
778
779 if (!(vi->status & VIRTIO_NET_S_LINK_UP))
780 return LL_FLUSH_FAILED;
781
782 if (!napi_schedule_prep(napi))
783 return LL_FLUSH_BUSY;
784
785 virtqueue_disable_cb(rq->vq);
786
787again:
788 received += virtnet_receive(rq, budget);
789
790 r = virtqueue_enable_cb_prepare(rq->vq);
791 clear_bit(NAPI_STATE_SCHED, &napi->state);
792 if (unlikely(virtqueue_poll(rq->vq, r)) &&
793 napi_schedule_prep(napi)) {
794 virtqueue_disable_cb(rq->vq);
795 if (received < budget) {
796 budget -= received;
797 goto again;
798 } else {
799 __napi_schedule(napi);
800 }
801 }
802
803 return received;
804}
805#endif
806
807static int virtnet_open(struct net_device *dev)
808{
809 struct virtnet_info *vi = netdev_priv(dev);
810 int i;
811
812 for (i = 0; i < vi->max_queue_pairs; i++) {
813 if (i < vi->curr_queue_pairs)
814
815 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
816 schedule_delayed_work(&vi->refill, 0);
817 virtnet_napi_enable(&vi->rq[i]);
818 }
819
820 return 0;
821}
822
823static void free_old_xmit_skbs(struct send_queue *sq)
824{
825 struct sk_buff *skb;
826 unsigned int len;
827 struct virtnet_info *vi = sq->vq->vdev->priv;
828 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
829
830 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
831 pr_debug("Sent skb %p\n", skb);
832
833 u64_stats_update_begin(&stats->tx_syncp);
834 stats->tx_bytes += skb->len;
835 stats->tx_packets++;
836 u64_stats_update_end(&stats->tx_syncp);
837
838 dev_kfree_skb_any(skb);
839 }
840}
841
842static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
843{
844 struct virtio_net_hdr_mrg_rxbuf *hdr;
845 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
846 struct virtnet_info *vi = sq->vq->vdev->priv;
847 unsigned num_sg;
848 unsigned hdr_len = vi->hdr_len;
849 bool can_push;
850
851 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
852
853 can_push = vi->any_header_sg &&
854 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
855 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
856
857
858 if (can_push)
859 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
860 else
861 hdr = skb_vnet_hdr(skb);
862
863 if (skb->ip_summed == CHECKSUM_PARTIAL) {
864 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
865 hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev,
866 skb_checksum_start_offset(skb));
867 hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev,
868 skb->csum_offset);
869 } else {
870 hdr->hdr.flags = 0;
871 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
872 }
873
874 if (skb_is_gso(skb)) {
875 hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb));
876 hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev,
877 skb_shinfo(skb)->gso_size);
878 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
879 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
880 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
881 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
882 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
883 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
884 else
885 BUG();
886 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
887 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
888 } else {
889 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
890 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
891 }
892
893 if (vi->mergeable_rx_bufs)
894 hdr->num_buffers = 0;
895
896 sg_init_table(sq->sg, MAX_SKB_FRAGS + 2);
897 if (can_push) {
898 __skb_push(skb, hdr_len);
899 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
900
901 __skb_pull(skb, hdr_len);
902 } else {
903 sg_set_buf(sq->sg, hdr, hdr_len);
904 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
905 }
906 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
907}
908
909static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
910{
911 struct virtnet_info *vi = netdev_priv(dev);
912 int qnum = skb_get_queue_mapping(skb);
913 struct send_queue *sq = &vi->sq[qnum];
914 int err;
915 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
916 bool kick = !skb->xmit_more;
917
918
919 free_old_xmit_skbs(sq);
920
921
922 skb_tx_timestamp(skb);
923
924
925 err = xmit_skb(sq, skb);
926
927
928 if (unlikely(err)) {
929 dev->stats.tx_fifo_errors++;
930 if (net_ratelimit())
931 dev_warn(&dev->dev,
932 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
933 dev->stats.tx_dropped++;
934 dev_kfree_skb_any(skb);
935 return NETDEV_TX_OK;
936 }
937
938
939 skb_orphan(skb);
940 nf_reset(skb);
941
942
943
944
945
946
947
948
949
950
951
952 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
953 netif_stop_subqueue(dev, qnum);
954 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
955
956 free_old_xmit_skbs(sq);
957 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
958 netif_start_subqueue(dev, qnum);
959 virtqueue_disable_cb(sq->vq);
960 }
961 }
962 }
963
964 if (kick || netif_xmit_stopped(txq))
965 virtqueue_kick(sq->vq);
966
967 return NETDEV_TX_OK;
968}
969
970
971
972
973
974
975static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
976 struct scatterlist *out)
977{
978 struct scatterlist *sgs[4], hdr, stat;
979 struct virtio_net_ctrl_hdr ctrl;
980 virtio_net_ctrl_ack status = ~0;
981 unsigned out_num = 0, tmp;
982
983
984 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
985
986 ctrl.class = class;
987 ctrl.cmd = cmd;
988
989 sg_init_one(&hdr, &ctrl, sizeof(ctrl));
990 sgs[out_num++] = &hdr;
991
992 if (out)
993 sgs[out_num++] = out;
994
995
996 sg_init_one(&stat, &status, sizeof(status));
997 sgs[out_num] = &stat;
998
999 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1000 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1001
1002 if (unlikely(!virtqueue_kick(vi->cvq)))
1003 return status == VIRTIO_NET_OK;
1004
1005
1006
1007
1008 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1009 !virtqueue_is_broken(vi->cvq))
1010 cpu_relax();
1011
1012 return status == VIRTIO_NET_OK;
1013}
1014
1015static int virtnet_set_mac_address(struct net_device *dev, void *p)
1016{
1017 struct virtnet_info *vi = netdev_priv(dev);
1018 struct virtio_device *vdev = vi->vdev;
1019 int ret;
1020 struct sockaddr *addr = p;
1021 struct scatterlist sg;
1022
1023 ret = eth_prepare_mac_addr_change(dev, p);
1024 if (ret)
1025 return ret;
1026
1027 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1028 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1029 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1030 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1031 dev_warn(&vdev->dev,
1032 "Failed to set mac address by vq command.\n");
1033 return -EINVAL;
1034 }
1035 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1036 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1037 unsigned int i;
1038
1039
1040 for (i = 0; i < dev->addr_len; i++)
1041 virtio_cwrite8(vdev,
1042 offsetof(struct virtio_net_config, mac) +
1043 i, addr->sa_data[i]);
1044 }
1045
1046 eth_commit_mac_addr_change(dev, p);
1047
1048 return 0;
1049}
1050
1051static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
1052 struct rtnl_link_stats64 *tot)
1053{
1054 struct virtnet_info *vi = netdev_priv(dev);
1055 int cpu;
1056 unsigned int start;
1057
1058 for_each_possible_cpu(cpu) {
1059 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
1060 u64 tpackets, tbytes, rpackets, rbytes;
1061
1062 do {
1063 start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
1064 tpackets = stats->tx_packets;
1065 tbytes = stats->tx_bytes;
1066 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
1067
1068 do {
1069 start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
1070 rpackets = stats->rx_packets;
1071 rbytes = stats->rx_bytes;
1072 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
1073
1074 tot->rx_packets += rpackets;
1075 tot->tx_packets += tpackets;
1076 tot->rx_bytes += rbytes;
1077 tot->tx_bytes += tbytes;
1078 }
1079
1080 tot->tx_dropped = dev->stats.tx_dropped;
1081 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1082 tot->rx_dropped = dev->stats.rx_dropped;
1083 tot->rx_length_errors = dev->stats.rx_length_errors;
1084 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1085
1086 return tot;
1087}
1088
1089#ifdef CONFIG_NET_POLL_CONTROLLER
1090static void virtnet_netpoll(struct net_device *dev)
1091{
1092 struct virtnet_info *vi = netdev_priv(dev);
1093 int i;
1094
1095 for (i = 0; i < vi->curr_queue_pairs; i++)
1096 napi_schedule(&vi->rq[i].napi);
1097}
1098#endif
1099
1100static void virtnet_ack_link_announce(struct virtnet_info *vi)
1101{
1102 rtnl_lock();
1103 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1104 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1105 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1106 rtnl_unlock();
1107}
1108
1109static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1110{
1111 struct scatterlist sg;
1112 struct virtio_net_ctrl_mq s;
1113 struct net_device *dev = vi->dev;
1114
1115 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1116 return 0;
1117
1118 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1119 sg_init_one(&sg, &s, sizeof(s));
1120
1121 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1122 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1123 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1124 queue_pairs);
1125 return -EINVAL;
1126 } else {
1127 vi->curr_queue_pairs = queue_pairs;
1128
1129 if (dev->flags & IFF_UP)
1130 schedule_delayed_work(&vi->refill, 0);
1131 }
1132
1133 return 0;
1134}
1135
1136static int virtnet_close(struct net_device *dev)
1137{
1138 struct virtnet_info *vi = netdev_priv(dev);
1139 int i;
1140
1141
1142 cancel_delayed_work_sync(&vi->refill);
1143
1144 for (i = 0; i < vi->max_queue_pairs; i++)
1145 napi_disable(&vi->rq[i].napi);
1146
1147 return 0;
1148}
1149
1150static void virtnet_set_rx_mode(struct net_device *dev)
1151{
1152 struct virtnet_info *vi = netdev_priv(dev);
1153 struct scatterlist sg[2];
1154 u8 promisc, allmulti;
1155 struct virtio_net_ctrl_mac *mac_data;
1156 struct netdev_hw_addr *ha;
1157 int uc_count;
1158 int mc_count;
1159 void *buf;
1160 int i;
1161
1162
1163 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1164 return;
1165
1166 promisc = ((dev->flags & IFF_PROMISC) != 0);
1167 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1168
1169 sg_init_one(sg, &promisc, sizeof(promisc));
1170
1171 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1172 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1173 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1174 promisc ? "en" : "dis");
1175
1176 sg_init_one(sg, &allmulti, sizeof(allmulti));
1177
1178 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1179 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1180 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1181 allmulti ? "en" : "dis");
1182
1183 uc_count = netdev_uc_count(dev);
1184 mc_count = netdev_mc_count(dev);
1185
1186 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1187 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1188 mac_data = buf;
1189 if (!buf)
1190 return;
1191
1192 sg_init_table(sg, 2);
1193
1194
1195 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1196 i = 0;
1197 netdev_for_each_uc_addr(ha, dev)
1198 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1199
1200 sg_set_buf(&sg[0], mac_data,
1201 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1202
1203
1204 mac_data = (void *)&mac_data->macs[uc_count][0];
1205
1206 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1207 i = 0;
1208 netdev_for_each_mc_addr(ha, dev)
1209 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1210
1211 sg_set_buf(&sg[1], mac_data,
1212 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1213
1214 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1215 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1216 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1217
1218 kfree(buf);
1219}
1220
1221static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1222 __be16 proto, u16 vid)
1223{
1224 struct virtnet_info *vi = netdev_priv(dev);
1225 struct scatterlist sg;
1226
1227 sg_init_one(&sg, &vid, sizeof(vid));
1228
1229 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1230 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1231 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1232 return 0;
1233}
1234
1235static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1236 __be16 proto, u16 vid)
1237{
1238 struct virtnet_info *vi = netdev_priv(dev);
1239 struct scatterlist sg;
1240
1241 sg_init_one(&sg, &vid, sizeof(vid));
1242
1243 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1244 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1245 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1246 return 0;
1247}
1248
1249static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1250{
1251 int i;
1252
1253 if (vi->affinity_hint_set) {
1254 for (i = 0; i < vi->max_queue_pairs; i++) {
1255 virtqueue_set_affinity(vi->rq[i].vq, -1);
1256 virtqueue_set_affinity(vi->sq[i].vq, -1);
1257 }
1258
1259 vi->affinity_hint_set = false;
1260 }
1261}
1262
1263static void virtnet_set_affinity(struct virtnet_info *vi)
1264{
1265 int i;
1266 int cpu;
1267
1268
1269
1270
1271
1272 if (vi->curr_queue_pairs == 1 ||
1273 vi->max_queue_pairs != num_online_cpus()) {
1274 virtnet_clean_affinity(vi, -1);
1275 return;
1276 }
1277
1278 i = 0;
1279 for_each_online_cpu(cpu) {
1280 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1281 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1282 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1283 i++;
1284 }
1285
1286 vi->affinity_hint_set = true;
1287}
1288
1289static int virtnet_cpu_callback(struct notifier_block *nfb,
1290 unsigned long action, void *hcpu)
1291{
1292 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
1293
1294 switch(action & ~CPU_TASKS_FROZEN) {
1295 case CPU_ONLINE:
1296 case CPU_DOWN_FAILED:
1297 case CPU_DEAD:
1298 virtnet_set_affinity(vi);
1299 break;
1300 case CPU_DOWN_PREPARE:
1301 virtnet_clean_affinity(vi, (long)hcpu);
1302 break;
1303 default:
1304 break;
1305 }
1306
1307 return NOTIFY_OK;
1308}
1309
1310static void virtnet_get_ringparam(struct net_device *dev,
1311 struct ethtool_ringparam *ring)
1312{
1313 struct virtnet_info *vi = netdev_priv(dev);
1314
1315 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1316 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1317 ring->rx_pending = ring->rx_max_pending;
1318 ring->tx_pending = ring->tx_max_pending;
1319}
1320
1321
1322static void virtnet_get_drvinfo(struct net_device *dev,
1323 struct ethtool_drvinfo *info)
1324{
1325 struct virtnet_info *vi = netdev_priv(dev);
1326 struct virtio_device *vdev = vi->vdev;
1327
1328 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1329 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1330 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1331
1332}
1333
1334
1335static int virtnet_set_channels(struct net_device *dev,
1336 struct ethtool_channels *channels)
1337{
1338 struct virtnet_info *vi = netdev_priv(dev);
1339 u16 queue_pairs = channels->combined_count;
1340 int err;
1341
1342
1343
1344
1345 if (channels->rx_count || channels->tx_count || channels->other_count)
1346 return -EINVAL;
1347
1348 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1349 return -EINVAL;
1350
1351 get_online_cpus();
1352 err = virtnet_set_queues(vi, queue_pairs);
1353 if (!err) {
1354 netif_set_real_num_tx_queues(dev, queue_pairs);
1355 netif_set_real_num_rx_queues(dev, queue_pairs);
1356
1357 virtnet_set_affinity(vi);
1358 }
1359 put_online_cpus();
1360
1361 return err;
1362}
1363
1364static void virtnet_get_channels(struct net_device *dev,
1365 struct ethtool_channels *channels)
1366{
1367 struct virtnet_info *vi = netdev_priv(dev);
1368
1369 channels->combined_count = vi->curr_queue_pairs;
1370 channels->max_combined = vi->max_queue_pairs;
1371 channels->max_other = 0;
1372 channels->rx_count = 0;
1373 channels->tx_count = 0;
1374 channels->other_count = 0;
1375}
1376
1377static const struct ethtool_ops virtnet_ethtool_ops = {
1378 .get_drvinfo = virtnet_get_drvinfo,
1379 .get_link = ethtool_op_get_link,
1380 .get_ringparam = virtnet_get_ringparam,
1381 .set_channels = virtnet_set_channels,
1382 .get_channels = virtnet_get_channels,
1383 .get_ts_info = ethtool_op_get_ts_info,
1384};
1385
1386#define MIN_MTU 68
1387#define MAX_MTU 65535
1388
1389static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1390{
1391 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1392 return -EINVAL;
1393 dev->mtu = new_mtu;
1394 return 0;
1395}
1396
1397static const struct net_device_ops virtnet_netdev = {
1398 .ndo_open = virtnet_open,
1399 .ndo_stop = virtnet_close,
1400 .ndo_start_xmit = start_xmit,
1401 .ndo_validate_addr = eth_validate_addr,
1402 .ndo_set_mac_address = virtnet_set_mac_address,
1403 .ndo_set_rx_mode = virtnet_set_rx_mode,
1404 .ndo_change_mtu = virtnet_change_mtu,
1405 .ndo_get_stats64 = virtnet_stats,
1406 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1407 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1408#ifdef CONFIG_NET_POLL_CONTROLLER
1409 .ndo_poll_controller = virtnet_netpoll,
1410#endif
1411#ifdef CONFIG_NET_RX_BUSY_POLL
1412 .ndo_busy_poll = virtnet_busy_poll,
1413#endif
1414};
1415
1416static void virtnet_config_changed_work(struct work_struct *work)
1417{
1418 struct virtnet_info *vi =
1419 container_of(work, struct virtnet_info, config_work);
1420 u16 v;
1421
1422 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
1423 struct virtio_net_config, status, &v) < 0)
1424 return;
1425
1426 if (v & VIRTIO_NET_S_ANNOUNCE) {
1427 netdev_notify_peers(vi->dev);
1428 virtnet_ack_link_announce(vi);
1429 }
1430
1431
1432 v &= VIRTIO_NET_S_LINK_UP;
1433
1434 if (vi->status == v)
1435 return;
1436
1437 vi->status = v;
1438
1439 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1440 netif_carrier_on(vi->dev);
1441 netif_tx_wake_all_queues(vi->dev);
1442 } else {
1443 netif_carrier_off(vi->dev);
1444 netif_tx_stop_all_queues(vi->dev);
1445 }
1446}
1447
1448static void virtnet_config_changed(struct virtio_device *vdev)
1449{
1450 struct virtnet_info *vi = vdev->priv;
1451
1452 schedule_work(&vi->config_work);
1453}
1454
1455static void virtnet_free_queues(struct virtnet_info *vi)
1456{
1457 int i;
1458
1459 for (i = 0; i < vi->max_queue_pairs; i++) {
1460 napi_hash_del(&vi->rq[i].napi);
1461 netif_napi_del(&vi->rq[i].napi);
1462 }
1463
1464 kfree(vi->rq);
1465 kfree(vi->sq);
1466}
1467
1468static void free_receive_bufs(struct virtnet_info *vi)
1469{
1470 int i;
1471
1472 for (i = 0; i < vi->max_queue_pairs; i++) {
1473 while (vi->rq[i].pages)
1474 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1475 }
1476}
1477
1478static void free_receive_page_frags(struct virtnet_info *vi)
1479{
1480 int i;
1481 for (i = 0; i < vi->max_queue_pairs; i++)
1482 if (vi->rq[i].alloc_frag.page)
1483 put_page(vi->rq[i].alloc_frag.page);
1484}
1485
1486static void free_unused_bufs(struct virtnet_info *vi)
1487{
1488 void *buf;
1489 int i;
1490
1491 for (i = 0; i < vi->max_queue_pairs; i++) {
1492 struct virtqueue *vq = vi->sq[i].vq;
1493 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1494 dev_kfree_skb(buf);
1495 }
1496
1497 for (i = 0; i < vi->max_queue_pairs; i++) {
1498 struct virtqueue *vq = vi->rq[i].vq;
1499
1500 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1501 if (vi->mergeable_rx_bufs) {
1502 unsigned long ctx = (unsigned long)buf;
1503 void *base = mergeable_ctx_to_buf_address(ctx);
1504 put_page(virt_to_head_page(base));
1505 } else if (vi->big_packets) {
1506 give_pages(&vi->rq[i], buf);
1507 } else {
1508 dev_kfree_skb(buf);
1509 }
1510 }
1511 }
1512}
1513
1514static void virtnet_del_vqs(struct virtnet_info *vi)
1515{
1516 struct virtio_device *vdev = vi->vdev;
1517
1518 virtnet_clean_affinity(vi, -1);
1519
1520 vdev->config->del_vqs(vdev);
1521
1522 virtnet_free_queues(vi);
1523}
1524
1525static int virtnet_find_vqs(struct virtnet_info *vi)
1526{
1527 vq_callback_t **callbacks;
1528 struct virtqueue **vqs;
1529 int ret = -ENOMEM;
1530 int i, total_vqs;
1531 const char **names;
1532
1533
1534
1535
1536
1537 total_vqs = vi->max_queue_pairs * 2 +
1538 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1539
1540
1541 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1542 if (!vqs)
1543 goto err_vq;
1544 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1545 if (!callbacks)
1546 goto err_callback;
1547 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1548 if (!names)
1549 goto err_names;
1550
1551
1552 if (vi->has_cvq) {
1553 callbacks[total_vqs - 1] = NULL;
1554 names[total_vqs - 1] = "control";
1555 }
1556
1557
1558 for (i = 0; i < vi->max_queue_pairs; i++) {
1559 callbacks[rxq2vq(i)] = skb_recv_done;
1560 callbacks[txq2vq(i)] = skb_xmit_done;
1561 sprintf(vi->rq[i].name, "input.%d", i);
1562 sprintf(vi->sq[i].name, "output.%d", i);
1563 names[rxq2vq(i)] = vi->rq[i].name;
1564 names[txq2vq(i)] = vi->sq[i].name;
1565 }
1566
1567 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1568 names);
1569 if (ret)
1570 goto err_find;
1571
1572 if (vi->has_cvq) {
1573 vi->cvq = vqs[total_vqs - 1];
1574 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1575 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1576 }
1577
1578 for (i = 0; i < vi->max_queue_pairs; i++) {
1579 vi->rq[i].vq = vqs[rxq2vq(i)];
1580 vi->sq[i].vq = vqs[txq2vq(i)];
1581 }
1582
1583 kfree(names);
1584 kfree(callbacks);
1585 kfree(vqs);
1586
1587 return 0;
1588
1589err_find:
1590 kfree(names);
1591err_names:
1592 kfree(callbacks);
1593err_callback:
1594 kfree(vqs);
1595err_vq:
1596 return ret;
1597}
1598
1599static int virtnet_alloc_queues(struct virtnet_info *vi)
1600{
1601 int i;
1602
1603 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1604 if (!vi->sq)
1605 goto err_sq;
1606 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1607 if (!vi->rq)
1608 goto err_rq;
1609
1610 INIT_DELAYED_WORK(&vi->refill, refill_work);
1611 for (i = 0; i < vi->max_queue_pairs; i++) {
1612 vi->rq[i].pages = NULL;
1613 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1614 napi_weight);
1615 napi_hash_add(&vi->rq[i].napi);
1616
1617 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1618 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT);
1619 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1620 }
1621
1622 return 0;
1623
1624err_rq:
1625 kfree(vi->sq);
1626err_sq:
1627 return -ENOMEM;
1628}
1629
1630static int init_vqs(struct virtnet_info *vi)
1631{
1632 int ret;
1633
1634
1635 ret = virtnet_alloc_queues(vi);
1636 if (ret)
1637 goto err;
1638
1639 ret = virtnet_find_vqs(vi);
1640 if (ret)
1641 goto err_free;
1642
1643 get_online_cpus();
1644 virtnet_set_affinity(vi);
1645 put_online_cpus();
1646
1647 return 0;
1648
1649err_free:
1650 virtnet_free_queues(vi);
1651err:
1652 return ret;
1653}
1654
1655#ifdef CONFIG_SYSFS
1656static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
1657 struct rx_queue_attribute *attribute, char *buf)
1658{
1659 struct virtnet_info *vi = netdev_priv(queue->dev);
1660 unsigned int queue_index = get_netdev_rx_queue_index(queue);
1661 struct ewma *avg;
1662
1663 BUG_ON(queue_index >= vi->max_queue_pairs);
1664 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
1665 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
1666}
1667
1668static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
1669 __ATTR_RO(mergeable_rx_buffer_size);
1670
1671static struct attribute *virtio_net_mrg_rx_attrs[] = {
1672 &mergeable_rx_buffer_size_attribute.attr,
1673 NULL
1674};
1675
1676static const struct attribute_group virtio_net_mrg_rx_group = {
1677 .name = "virtio_net",
1678 .attrs = virtio_net_mrg_rx_attrs
1679};
1680#endif
1681
1682static bool virtnet_fail_on_feature(struct virtio_device *vdev,
1683 unsigned int fbit,
1684 const char *fname, const char *dname)
1685{
1686 if (!virtio_has_feature(vdev, fbit))
1687 return false;
1688
1689 dev_err(&vdev->dev, "device advertises feature %s but not %s",
1690 fname, dname);
1691
1692 return true;
1693}
1694
1695#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
1696 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
1697
1698static bool virtnet_validate_features(struct virtio_device *vdev)
1699{
1700 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
1701 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
1702 "VIRTIO_NET_F_CTRL_VQ") ||
1703 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
1704 "VIRTIO_NET_F_CTRL_VQ") ||
1705 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
1706 "VIRTIO_NET_F_CTRL_VQ") ||
1707 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
1708 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
1709 "VIRTIO_NET_F_CTRL_VQ"))) {
1710 return false;
1711 }
1712
1713 return true;
1714}
1715
1716static int virtnet_probe(struct virtio_device *vdev)
1717{
1718 int i, err;
1719 struct net_device *dev;
1720 struct virtnet_info *vi;
1721 u16 max_queue_pairs;
1722
1723 if (!vdev->config->get) {
1724 dev_err(&vdev->dev, "%s failure: config access disabled\n",
1725 __func__);
1726 return -EINVAL;
1727 }
1728
1729 if (!virtnet_validate_features(vdev))
1730 return -EINVAL;
1731
1732
1733 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
1734 struct virtio_net_config,
1735 max_virtqueue_pairs, &max_queue_pairs);
1736
1737
1738 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1739 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1740 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1741 max_queue_pairs = 1;
1742
1743
1744 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1745 if (!dev)
1746 return -ENOMEM;
1747
1748
1749 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1750 dev->netdev_ops = &virtnet_netdev;
1751 dev->features = NETIF_F_HIGHDMA;
1752
1753 dev->ethtool_ops = &virtnet_ethtool_ops;
1754 SET_NETDEV_DEV(dev, &vdev->dev);
1755
1756
1757 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1758
1759 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1760 if (csum)
1761 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1762
1763 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1764 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1765 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1766 }
1767
1768 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1769 dev->hw_features |= NETIF_F_TSO;
1770 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1771 dev->hw_features |= NETIF_F_TSO6;
1772 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1773 dev->hw_features |= NETIF_F_TSO_ECN;
1774 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1775 dev->hw_features |= NETIF_F_UFO;
1776
1777 dev->features |= NETIF_F_GSO_ROBUST;
1778
1779 if (gso)
1780 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1781
1782 }
1783 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
1784 dev->features |= NETIF_F_RXCSUM;
1785
1786 dev->vlan_features = dev->features;
1787
1788
1789 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
1790 virtio_cread_bytes(vdev,
1791 offsetof(struct virtio_net_config, mac),
1792 dev->dev_addr, dev->addr_len);
1793 else
1794 eth_hw_addr_random(dev);
1795
1796
1797 vi = netdev_priv(dev);
1798 vi->dev = dev;
1799 vi->vdev = vdev;
1800 vdev->priv = vi;
1801 vi->stats = alloc_percpu(struct virtnet_stats);
1802 err = -ENOMEM;
1803 if (vi->stats == NULL)
1804 goto free;
1805
1806 for_each_possible_cpu(i) {
1807 struct virtnet_stats *virtnet_stats;
1808 virtnet_stats = per_cpu_ptr(vi->stats, i);
1809 u64_stats_init(&virtnet_stats->tx_syncp);
1810 u64_stats_init(&virtnet_stats->rx_syncp);
1811 }
1812
1813 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1814
1815
1816 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1817 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1818 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
1819 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
1820 vi->big_packets = true;
1821
1822 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1823 vi->mergeable_rx_bufs = true;
1824
1825 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
1826 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
1827 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1828 else
1829 vi->hdr_len = sizeof(struct virtio_net_hdr);
1830
1831 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT))
1832 vi->any_header_sg = true;
1833
1834 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1835 vi->has_cvq = true;
1836
1837 if (vi->any_header_sg)
1838 dev->needed_headroom = vi->hdr_len;
1839
1840
1841 vi->curr_queue_pairs = 1;
1842 vi->max_queue_pairs = max_queue_pairs;
1843
1844
1845 err = init_vqs(vi);
1846 if (err)
1847 goto free_stats;
1848
1849#ifdef CONFIG_SYSFS
1850 if (vi->mergeable_rx_bufs)
1851 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
1852#endif
1853 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
1854 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
1855
1856 err = register_netdev(dev);
1857 if (err) {
1858 pr_debug("virtio_net: registering device failed\n");
1859 goto free_vqs;
1860 }
1861
1862 virtio_device_ready(vdev);
1863
1864
1865 for (i = 0; i < vi->curr_queue_pairs; i++) {
1866 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL);
1867
1868
1869 if (vi->rq[i].vq->num_free ==
1870 virtqueue_get_vring_size(vi->rq[i].vq)) {
1871 free_unused_bufs(vi);
1872 err = -ENOMEM;
1873 goto free_recv_bufs;
1874 }
1875 }
1876
1877 vi->nb.notifier_call = &virtnet_cpu_callback;
1878 err = register_hotcpu_notifier(&vi->nb);
1879 if (err) {
1880 pr_debug("virtio_net: registering cpu notifier failed\n");
1881 goto free_recv_bufs;
1882 }
1883
1884
1885
1886 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1887 netif_carrier_off(dev);
1888 schedule_work(&vi->config_work);
1889 } else {
1890 vi->status = VIRTIO_NET_S_LINK_UP;
1891 netif_carrier_on(dev);
1892 }
1893
1894 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1895 dev->name, max_queue_pairs);
1896
1897 return 0;
1898
1899free_recv_bufs:
1900 vi->vdev->config->reset(vdev);
1901
1902 free_receive_bufs(vi);
1903 unregister_netdev(dev);
1904free_vqs:
1905 cancel_delayed_work_sync(&vi->refill);
1906 free_receive_page_frags(vi);
1907 virtnet_del_vqs(vi);
1908free_stats:
1909 free_percpu(vi->stats);
1910free:
1911 free_netdev(dev);
1912 return err;
1913}
1914
1915static void remove_vq_common(struct virtnet_info *vi)
1916{
1917 vi->vdev->config->reset(vi->vdev);
1918
1919
1920 free_unused_bufs(vi);
1921
1922 free_receive_bufs(vi);
1923
1924 free_receive_page_frags(vi);
1925
1926 virtnet_del_vqs(vi);
1927}
1928
1929static void virtnet_remove(struct virtio_device *vdev)
1930{
1931 struct virtnet_info *vi = vdev->priv;
1932
1933 unregister_hotcpu_notifier(&vi->nb);
1934
1935
1936 flush_work(&vi->config_work);
1937
1938 unregister_netdev(vi->dev);
1939
1940 remove_vq_common(vi);
1941
1942 free_percpu(vi->stats);
1943 free_netdev(vi->dev);
1944}
1945
1946#ifdef CONFIG_PM_SLEEP
1947static int virtnet_freeze(struct virtio_device *vdev)
1948{
1949 struct virtnet_info *vi = vdev->priv;
1950 int i;
1951
1952 unregister_hotcpu_notifier(&vi->nb);
1953
1954
1955 flush_work(&vi->config_work);
1956
1957 netif_device_detach(vi->dev);
1958 cancel_delayed_work_sync(&vi->refill);
1959
1960 if (netif_running(vi->dev)) {
1961 for (i = 0; i < vi->max_queue_pairs; i++)
1962 napi_disable(&vi->rq[i].napi);
1963 }
1964
1965 remove_vq_common(vi);
1966
1967 return 0;
1968}
1969
1970static int virtnet_restore(struct virtio_device *vdev)
1971{
1972 struct virtnet_info *vi = vdev->priv;
1973 int err, i;
1974
1975 err = init_vqs(vi);
1976 if (err)
1977 return err;
1978
1979 virtio_device_ready(vdev);
1980
1981 if (netif_running(vi->dev)) {
1982 for (i = 0; i < vi->curr_queue_pairs; i++)
1983 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1984 schedule_delayed_work(&vi->refill, 0);
1985
1986 for (i = 0; i < vi->max_queue_pairs; i++)
1987 virtnet_napi_enable(&vi->rq[i]);
1988 }
1989
1990 netif_device_attach(vi->dev);
1991
1992 rtnl_lock();
1993 virtnet_set_queues(vi, vi->curr_queue_pairs);
1994 rtnl_unlock();
1995
1996 err = register_hotcpu_notifier(&vi->nb);
1997 if (err)
1998 return err;
1999
2000 return 0;
2001}
2002#endif
2003
2004static struct virtio_device_id id_table[] = {
2005 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
2006 { 0 },
2007};
2008
2009static unsigned int features[] = {
2010 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
2011 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
2012 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
2013 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
2014 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
2015 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
2016 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
2017 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
2018 VIRTIO_NET_F_CTRL_MAC_ADDR,
2019 VIRTIO_F_ANY_LAYOUT,
2020};
2021
2022static struct virtio_driver virtio_net_driver = {
2023 .feature_table = features,
2024 .feature_table_size = ARRAY_SIZE(features),
2025 .driver.name = KBUILD_MODNAME,
2026 .driver.owner = THIS_MODULE,
2027 .id_table = id_table,
2028 .probe = virtnet_probe,
2029 .remove = virtnet_remove,
2030 .config_changed = virtnet_config_changed,
2031#ifdef CONFIG_PM_SLEEP
2032 .freeze = virtnet_freeze,
2033 .restore = virtnet_restore,
2034#endif
2035};
2036
2037module_virtio_driver(virtio_net_driver);
2038
2039MODULE_DEVICE_TABLE(virtio, id_table);
2040MODULE_DESCRIPTION("Virtio network driver");
2041MODULE_LICENSE("GPL");
2042