This source file includes following definitions.
- is_xdp_frame
- xdp_to_ptr
- ptr_to_xdp
- vq2txq
- txq2vq
- vq2rxq
- rxq2vq
- skb_vnet_hdr
- give_pages
- get_a_page
- virtqueue_napi_schedule
- virtqueue_napi_complete
- skb_xmit_done
- mergeable_len_to_ctx
- mergeable_ctx_to_headroom
- mergeable_ctx_to_truesize
- page_to_skb
- __virtnet_xdp_xmit_one
- virtnet_xdp_sq
- virtnet_xdp_xmit
- virtnet_get_headroom
- xdp_linearize_page
- receive_small
- receive_big
- receive_mergeable
- receive_buf
- add_recvbuf_small
- add_recvbuf_big
- get_mergeable_buf_len
- add_recvbuf_mergeable
- try_fill_recv
- skb_recv_done
- virtnet_napi_enable
- virtnet_napi_tx_enable
- virtnet_napi_tx_disable
- refill_work
- virtnet_receive
- free_old_xmit_skbs
- is_xdp_raw_buffer_queue
- virtnet_poll_cleantx
- virtnet_poll
- virtnet_open
- virtnet_poll_tx
- xmit_skb
- start_xmit
- virtnet_send_command
- virtnet_set_mac_address
- virtnet_stats
- virtnet_ack_link_announce
- _virtnet_set_queues
- virtnet_set_queues
- virtnet_close
- virtnet_set_rx_mode
- virtnet_vlan_rx_add_vid
- virtnet_vlan_rx_kill_vid
- virtnet_clean_affinity
- virtnet_set_affinity
- virtnet_cpu_online
- virtnet_cpu_dead
- virtnet_cpu_down_prep
- virtnet_cpu_notif_add
- virtnet_cpu_notif_remove
- virtnet_get_ringparam
- virtnet_get_drvinfo
- virtnet_set_channels
- virtnet_get_strings
- virtnet_get_sset_count
- virtnet_get_ethtool_stats
- virtnet_get_channels
- virtnet_validate_ethtool_cmd
- virtnet_set_link_ksettings
- virtnet_get_link_ksettings
- virtnet_set_coalesce
- virtnet_get_coalesce
- virtnet_init_settings
- virtnet_update_settings
- virtnet_freeze_down
- virtnet_restore_up
- virtnet_set_guest_offloads
- virtnet_clear_guest_offloads
- virtnet_restore_guest_offloads
- virtnet_xdp_set
- virtnet_xdp_query
- virtnet_xdp
- virtnet_get_phys_port_name
- virtnet_set_features
- virtnet_config_changed_work
- virtnet_config_changed
- virtnet_free_queues
- _free_receive_bufs
- free_receive_bufs
- free_receive_page_frags
- free_unused_bufs
- virtnet_del_vqs
- mergeable_min_buf_len
- virtnet_find_vqs
- virtnet_alloc_queues
- init_vqs
- mergeable_rx_buffer_size_show
- virtnet_fail_on_feature
- virtnet_validate_features
- virtnet_validate
- virtnet_probe
- remove_vq_common
- virtnet_remove
- virtnet_freeze
- virtnet_restore
- virtio_net_driver_init
- virtio_net_driver_exit
1
2
3
4
5
6
7 #include <linux/netdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/ethtool.h>
10 #include <linux/module.h>
11 #include <linux/virtio.h>
12 #include <linux/virtio_net.h>
13 #include <linux/bpf.h>
14 #include <linux/bpf_trace.h>
15 #include <linux/scatterlist.h>
16 #include <linux/if_vlan.h>
17 #include <linux/slab.h>
18 #include <linux/cpu.h>
19 #include <linux/average.h>
20 #include <linux/filter.h>
21 #include <linux/kernel.h>
22 #include <net/route.h>
23 #include <net/xdp.h>
24 #include <net/net_failover.h>
25
26 static int napi_weight = NAPI_POLL_WEIGHT;
27 module_param(napi_weight, int, 0444);
28
29 static bool csum = true, gso = true, napi_tx = true;
30 module_param(csum, bool, 0444);
31 module_param(gso, bool, 0444);
32 module_param(napi_tx, bool, 0644);
33
34
35 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
36 #define GOOD_COPY_LEN 128
37
38 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
39
40
41 #define VIRTIO_XDP_HEADROOM 256
42
43
44 #define VIRTIO_XDP_TX BIT(0)
45 #define VIRTIO_XDP_REDIR BIT(1)
46
47 #define VIRTIO_XDP_FLAG BIT(0)
48
49
50
51
52
53
54 DECLARE_EWMA(pkt_len, 0, 64)
55
56 #define VIRTNET_DRIVER_VERSION "1.0.0"
57
58 static const unsigned long guest_offloads[] = {
59 VIRTIO_NET_F_GUEST_TSO4,
60 VIRTIO_NET_F_GUEST_TSO6,
61 VIRTIO_NET_F_GUEST_ECN,
62 VIRTIO_NET_F_GUEST_UFO,
63 VIRTIO_NET_F_GUEST_CSUM
64 };
65
66 struct virtnet_stat_desc {
67 char desc[ETH_GSTRING_LEN];
68 size_t offset;
69 };
70
71 struct virtnet_sq_stats {
72 struct u64_stats_sync syncp;
73 u64 packets;
74 u64 bytes;
75 u64 xdp_tx;
76 u64 xdp_tx_drops;
77 u64 kicks;
78 };
79
80 struct virtnet_rq_stats {
81 struct u64_stats_sync syncp;
82 u64 packets;
83 u64 bytes;
84 u64 drops;
85 u64 xdp_packets;
86 u64 xdp_tx;
87 u64 xdp_redirects;
88 u64 xdp_drops;
89 u64 kicks;
90 };
91
92 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
93 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
94
95 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
96 { "packets", VIRTNET_SQ_STAT(packets) },
97 { "bytes", VIRTNET_SQ_STAT(bytes) },
98 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
99 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
100 { "kicks", VIRTNET_SQ_STAT(kicks) },
101 };
102
103 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
104 { "packets", VIRTNET_RQ_STAT(packets) },
105 { "bytes", VIRTNET_RQ_STAT(bytes) },
106 { "drops", VIRTNET_RQ_STAT(drops) },
107 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
108 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
109 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
110 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
111 { "kicks", VIRTNET_RQ_STAT(kicks) },
112 };
113
114 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
115 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
116
117
118 struct send_queue {
119
120 struct virtqueue *vq;
121
122
123 struct scatterlist sg[MAX_SKB_FRAGS + 2];
124
125
126 char name[40];
127
128 struct virtnet_sq_stats stats;
129
130 struct napi_struct napi;
131 };
132
133
134 struct receive_queue {
135
136 struct virtqueue *vq;
137
138 struct napi_struct napi;
139
140 struct bpf_prog __rcu *xdp_prog;
141
142 struct virtnet_rq_stats stats;
143
144
145 struct page *pages;
146
147
148 struct ewma_pkt_len mrg_avg_pkt_len;
149
150
151 struct page_frag alloc_frag;
152
153
154 struct scatterlist sg[MAX_SKB_FRAGS + 2];
155
156
157 unsigned int min_buf_len;
158
159
160 char name[40];
161
162 struct xdp_rxq_info xdp_rxq;
163 };
164
165
166 struct control_buf {
167 struct virtio_net_ctrl_hdr hdr;
168 virtio_net_ctrl_ack status;
169 struct virtio_net_ctrl_mq mq;
170 u8 promisc;
171 u8 allmulti;
172 __virtio16 vid;
173 __virtio64 offloads;
174 };
175
176 struct virtnet_info {
177 struct virtio_device *vdev;
178 struct virtqueue *cvq;
179 struct net_device *dev;
180 struct send_queue *sq;
181 struct receive_queue *rq;
182 unsigned int status;
183
184
185 u16 max_queue_pairs;
186
187
188 u16 curr_queue_pairs;
189
190
191 u16 xdp_queue_pairs;
192
193
194 bool big_packets;
195
196
197 bool mergeable_rx_bufs;
198
199
200 bool has_cvq;
201
202
203 bool any_header_sg;
204
205
206 u8 hdr_len;
207
208
209 struct delayed_work refill;
210
211
212 struct work_struct config_work;
213
214
215 bool affinity_hint_set;
216
217
218 struct hlist_node node;
219 struct hlist_node node_dead;
220
221 struct control_buf *ctrl;
222
223
224 u8 duplex;
225 u32 speed;
226
227 unsigned long guest_offloads;
228 unsigned long guest_offloads_capable;
229
230
231 struct failover *failover;
232 };
233
234 struct padded_vnet_hdr {
235 struct virtio_net_hdr_mrg_rxbuf hdr;
236
237
238
239
240
241 char padding[4];
242 };
243
244 static bool is_xdp_frame(void *ptr)
245 {
246 return (unsigned long)ptr & VIRTIO_XDP_FLAG;
247 }
248
249 static void *xdp_to_ptr(struct xdp_frame *ptr)
250 {
251 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
252 }
253
254 static struct xdp_frame *ptr_to_xdp(void *ptr)
255 {
256 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
257 }
258
259
260
261
262 static int vq2txq(struct virtqueue *vq)
263 {
264 return (vq->index - 1) / 2;
265 }
266
267 static int txq2vq(int txq)
268 {
269 return txq * 2 + 1;
270 }
271
272 static int vq2rxq(struct virtqueue *vq)
273 {
274 return vq->index / 2;
275 }
276
277 static int rxq2vq(int rxq)
278 {
279 return rxq * 2;
280 }
281
282 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
283 {
284 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
285 }
286
287
288
289
290
291 static void give_pages(struct receive_queue *rq, struct page *page)
292 {
293 struct page *end;
294
295
296 for (end = page; end->private; end = (struct page *)end->private);
297 end->private = (unsigned long)rq->pages;
298 rq->pages = page;
299 }
300
301 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
302 {
303 struct page *p = rq->pages;
304
305 if (p) {
306 rq->pages = (struct page *)p->private;
307
308 p->private = 0;
309 } else
310 p = alloc_page(gfp_mask);
311 return p;
312 }
313
314 static void virtqueue_napi_schedule(struct napi_struct *napi,
315 struct virtqueue *vq)
316 {
317 if (napi_schedule_prep(napi)) {
318 virtqueue_disable_cb(vq);
319 __napi_schedule(napi);
320 }
321 }
322
323 static void virtqueue_napi_complete(struct napi_struct *napi,
324 struct virtqueue *vq, int processed)
325 {
326 int opaque;
327
328 opaque = virtqueue_enable_cb_prepare(vq);
329 if (napi_complete_done(napi, processed)) {
330 if (unlikely(virtqueue_poll(vq, opaque)))
331 virtqueue_napi_schedule(napi, vq);
332 } else {
333 virtqueue_disable_cb(vq);
334 }
335 }
336
337 static void skb_xmit_done(struct virtqueue *vq)
338 {
339 struct virtnet_info *vi = vq->vdev->priv;
340 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
341
342
343 virtqueue_disable_cb(vq);
344
345 if (napi->weight)
346 virtqueue_napi_schedule(napi, vq);
347 else
348
349 netif_wake_subqueue(vi->dev, vq2txq(vq));
350 }
351
352 #define MRG_CTX_HEADER_SHIFT 22
353 static void *mergeable_len_to_ctx(unsigned int truesize,
354 unsigned int headroom)
355 {
356 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
357 }
358
359 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
360 {
361 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
362 }
363
364 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
365 {
366 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
367 }
368
369
370 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
371 struct receive_queue *rq,
372 struct page *page, unsigned int offset,
373 unsigned int len, unsigned int truesize,
374 bool hdr_valid)
375 {
376 struct sk_buff *skb;
377 struct virtio_net_hdr_mrg_rxbuf *hdr;
378 unsigned int copy, hdr_len, hdr_padded_len;
379 char *p;
380
381 p = page_address(page) + offset;
382
383
384 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
385 if (unlikely(!skb))
386 return NULL;
387
388 hdr = skb_vnet_hdr(skb);
389
390 hdr_len = vi->hdr_len;
391 if (vi->mergeable_rx_bufs)
392 hdr_padded_len = sizeof(*hdr);
393 else
394 hdr_padded_len = sizeof(struct padded_vnet_hdr);
395
396 if (hdr_valid)
397 memcpy(hdr, p, hdr_len);
398
399 len -= hdr_len;
400 offset += hdr_padded_len;
401 p += hdr_padded_len;
402
403 copy = len;
404 if (copy > skb_tailroom(skb))
405 copy = skb_tailroom(skb);
406 skb_put_data(skb, p, copy);
407
408 len -= copy;
409 offset += copy;
410
411 if (vi->mergeable_rx_bufs) {
412 if (len)
413 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
414 else
415 put_page(page);
416 return skb;
417 }
418
419
420
421
422
423
424
425 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
426 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
427 dev_kfree_skb(skb);
428 return NULL;
429 }
430 BUG_ON(offset >= PAGE_SIZE);
431 while (len) {
432 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
433 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
434 frag_size, truesize);
435 len -= frag_size;
436 page = (struct page *)page->private;
437 offset = 0;
438 }
439
440 if (page)
441 give_pages(rq, page);
442
443 return skb;
444 }
445
446 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
447 struct send_queue *sq,
448 struct xdp_frame *xdpf)
449 {
450 struct virtio_net_hdr_mrg_rxbuf *hdr;
451 int err;
452
453
454 if (unlikely(xdpf->metasize > 0))
455 return -EOPNOTSUPP;
456
457 if (unlikely(xdpf->headroom < vi->hdr_len))
458 return -EOVERFLOW;
459
460
461 xdpf->data -= vi->hdr_len;
462
463 hdr = xdpf->data;
464 memset(hdr, 0, vi->hdr_len);
465 xdpf->len += vi->hdr_len;
466
467 sg_init_one(sq->sg, xdpf->data, xdpf->len);
468
469 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf),
470 GFP_ATOMIC);
471 if (unlikely(err))
472 return -ENOSPC;
473
474 return 0;
475 }
476
477 static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi)
478 {
479 unsigned int qp;
480
481 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
482 return &vi->sq[qp];
483 }
484
485 static int virtnet_xdp_xmit(struct net_device *dev,
486 int n, struct xdp_frame **frames, u32 flags)
487 {
488 struct virtnet_info *vi = netdev_priv(dev);
489 struct receive_queue *rq = vi->rq;
490 struct bpf_prog *xdp_prog;
491 struct send_queue *sq;
492 unsigned int len;
493 int packets = 0;
494 int bytes = 0;
495 int drops = 0;
496 int kicks = 0;
497 int ret, err;
498 void *ptr;
499 int i;
500
501
502
503
504 xdp_prog = rcu_dereference(rq->xdp_prog);
505 if (!xdp_prog)
506 return -ENXIO;
507
508 sq = virtnet_xdp_sq(vi);
509
510 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
511 ret = -EINVAL;
512 drops = n;
513 goto out;
514 }
515
516
517 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
518 if (likely(is_xdp_frame(ptr))) {
519 struct xdp_frame *frame = ptr_to_xdp(ptr);
520
521 bytes += frame->len;
522 xdp_return_frame(frame);
523 } else {
524 struct sk_buff *skb = ptr;
525
526 bytes += skb->len;
527 napi_consume_skb(skb, false);
528 }
529 packets++;
530 }
531
532 for (i = 0; i < n; i++) {
533 struct xdp_frame *xdpf = frames[i];
534
535 err = __virtnet_xdp_xmit_one(vi, sq, xdpf);
536 if (err) {
537 xdp_return_frame_rx_napi(xdpf);
538 drops++;
539 }
540 }
541 ret = n - drops;
542
543 if (flags & XDP_XMIT_FLUSH) {
544 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
545 kicks = 1;
546 }
547 out:
548 u64_stats_update_begin(&sq->stats.syncp);
549 sq->stats.bytes += bytes;
550 sq->stats.packets += packets;
551 sq->stats.xdp_tx += n;
552 sq->stats.xdp_tx_drops += drops;
553 sq->stats.kicks += kicks;
554 u64_stats_update_end(&sq->stats.syncp);
555
556 return ret;
557 }
558
559 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
560 {
561 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0;
562 }
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578 static struct page *xdp_linearize_page(struct receive_queue *rq,
579 u16 *num_buf,
580 struct page *p,
581 int offset,
582 int page_off,
583 unsigned int *len)
584 {
585 struct page *page = alloc_page(GFP_ATOMIC);
586
587 if (!page)
588 return NULL;
589
590 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
591 page_off += *len;
592
593 while (--*num_buf) {
594 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
595 unsigned int buflen;
596 void *buf;
597 int off;
598
599 buf = virtqueue_get_buf(rq->vq, &buflen);
600 if (unlikely(!buf))
601 goto err_buf;
602
603 p = virt_to_head_page(buf);
604 off = buf - page_address(p);
605
606
607
608
609 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
610 put_page(p);
611 goto err_buf;
612 }
613
614 memcpy(page_address(page) + page_off,
615 page_address(p) + off, buflen);
616 page_off += buflen;
617 put_page(p);
618 }
619
620
621 *len = page_off - VIRTIO_XDP_HEADROOM;
622 return page;
623 err_buf:
624 __free_pages(page, 0);
625 return NULL;
626 }
627
628 static struct sk_buff *receive_small(struct net_device *dev,
629 struct virtnet_info *vi,
630 struct receive_queue *rq,
631 void *buf, void *ctx,
632 unsigned int len,
633 unsigned int *xdp_xmit,
634 struct virtnet_rq_stats *stats)
635 {
636 struct sk_buff *skb;
637 struct bpf_prog *xdp_prog;
638 unsigned int xdp_headroom = (unsigned long)ctx;
639 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
640 unsigned int headroom = vi->hdr_len + header_offset;
641 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
642 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
643 struct page *page = virt_to_head_page(buf);
644 unsigned int delta = 0;
645 struct page *xdp_page;
646 int err;
647
648 len -= vi->hdr_len;
649 stats->bytes += len;
650
651 rcu_read_lock();
652 xdp_prog = rcu_dereference(rq->xdp_prog);
653 if (xdp_prog) {
654 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
655 struct xdp_frame *xdpf;
656 struct xdp_buff xdp;
657 void *orig_data;
658 u32 act;
659
660 if (unlikely(hdr->hdr.gso_type))
661 goto err_xdp;
662
663 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
664 int offset = buf - page_address(page) + header_offset;
665 unsigned int tlen = len + vi->hdr_len;
666 u16 num_buf = 1;
667
668 xdp_headroom = virtnet_get_headroom(vi);
669 header_offset = VIRTNET_RX_PAD + xdp_headroom;
670 headroom = vi->hdr_len + header_offset;
671 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
672 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
673 xdp_page = xdp_linearize_page(rq, &num_buf, page,
674 offset, header_offset,
675 &tlen);
676 if (!xdp_page)
677 goto err_xdp;
678
679 buf = page_address(xdp_page);
680 put_page(page);
681 page = xdp_page;
682 }
683
684 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
685 xdp.data = xdp.data_hard_start + xdp_headroom;
686 xdp_set_data_meta_invalid(&xdp);
687 xdp.data_end = xdp.data + len;
688 xdp.rxq = &rq->xdp_rxq;
689 orig_data = xdp.data;
690 act = bpf_prog_run_xdp(xdp_prog, &xdp);
691 stats->xdp_packets++;
692
693 switch (act) {
694 case XDP_PASS:
695
696 delta = orig_data - xdp.data;
697 len = xdp.data_end - xdp.data;
698 break;
699 case XDP_TX:
700 stats->xdp_tx++;
701 xdpf = convert_to_xdp_frame(&xdp);
702 if (unlikely(!xdpf))
703 goto err_xdp;
704 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
705 if (unlikely(err < 0)) {
706 trace_xdp_exception(vi->dev, xdp_prog, act);
707 goto err_xdp;
708 }
709 *xdp_xmit |= VIRTIO_XDP_TX;
710 rcu_read_unlock();
711 goto xdp_xmit;
712 case XDP_REDIRECT:
713 stats->xdp_redirects++;
714 err = xdp_do_redirect(dev, &xdp, xdp_prog);
715 if (err)
716 goto err_xdp;
717 *xdp_xmit |= VIRTIO_XDP_REDIR;
718 rcu_read_unlock();
719 goto xdp_xmit;
720 default:
721 bpf_warn_invalid_xdp_action(act);
722
723 case XDP_ABORTED:
724 trace_xdp_exception(vi->dev, xdp_prog, act);
725 case XDP_DROP:
726 goto err_xdp;
727 }
728 }
729 rcu_read_unlock();
730
731 skb = build_skb(buf, buflen);
732 if (!skb) {
733 put_page(page);
734 goto err;
735 }
736 skb_reserve(skb, headroom - delta);
737 skb_put(skb, len);
738 if (!delta) {
739 buf += header_offset;
740 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
741 }
742
743 err:
744 return skb;
745
746 err_xdp:
747 rcu_read_unlock();
748 stats->xdp_drops++;
749 stats->drops++;
750 put_page(page);
751 xdp_xmit:
752 return NULL;
753 }
754
755 static struct sk_buff *receive_big(struct net_device *dev,
756 struct virtnet_info *vi,
757 struct receive_queue *rq,
758 void *buf,
759 unsigned int len,
760 struct virtnet_rq_stats *stats)
761 {
762 struct page *page = buf;
763 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len,
764 PAGE_SIZE, true);
765
766 stats->bytes += len - vi->hdr_len;
767 if (unlikely(!skb))
768 goto err;
769
770 return skb;
771
772 err:
773 stats->drops++;
774 give_pages(rq, page);
775 return NULL;
776 }
777
778 static struct sk_buff *receive_mergeable(struct net_device *dev,
779 struct virtnet_info *vi,
780 struct receive_queue *rq,
781 void *buf,
782 void *ctx,
783 unsigned int len,
784 unsigned int *xdp_xmit,
785 struct virtnet_rq_stats *stats)
786 {
787 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
788 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
789 struct page *page = virt_to_head_page(buf);
790 int offset = buf - page_address(page);
791 struct sk_buff *head_skb, *curr_skb;
792 struct bpf_prog *xdp_prog;
793 unsigned int truesize;
794 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
795 int err;
796
797 head_skb = NULL;
798 stats->bytes += len - vi->hdr_len;
799
800 rcu_read_lock();
801 xdp_prog = rcu_dereference(rq->xdp_prog);
802 if (xdp_prog) {
803 struct xdp_frame *xdpf;
804 struct page *xdp_page;
805 struct xdp_buff xdp;
806 void *data;
807 u32 act;
808
809
810
811
812
813 if (unlikely(hdr->hdr.gso_type))
814 goto err_xdp;
815
816
817
818
819
820
821
822 if (unlikely(num_buf > 1 ||
823 headroom < virtnet_get_headroom(vi))) {
824
825 xdp_page = xdp_linearize_page(rq, &num_buf,
826 page, offset,
827 VIRTIO_XDP_HEADROOM,
828 &len);
829 if (!xdp_page)
830 goto err_xdp;
831 offset = VIRTIO_XDP_HEADROOM;
832 } else {
833 xdp_page = page;
834 }
835
836
837
838
839 data = page_address(xdp_page) + offset;
840 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len;
841 xdp.data = data + vi->hdr_len;
842 xdp_set_data_meta_invalid(&xdp);
843 xdp.data_end = xdp.data + (len - vi->hdr_len);
844 xdp.rxq = &rq->xdp_rxq;
845
846 act = bpf_prog_run_xdp(xdp_prog, &xdp);
847 stats->xdp_packets++;
848
849 switch (act) {
850 case XDP_PASS:
851
852
853
854
855 offset = xdp.data -
856 page_address(xdp_page) - vi->hdr_len;
857
858
859
860
861 len = xdp.data_end - xdp.data + vi->hdr_len;
862
863 if (unlikely(xdp_page != page)) {
864 rcu_read_unlock();
865 put_page(page);
866 head_skb = page_to_skb(vi, rq, xdp_page,
867 offset, len,
868 PAGE_SIZE, false);
869 return head_skb;
870 }
871 break;
872 case XDP_TX:
873 stats->xdp_tx++;
874 xdpf = convert_to_xdp_frame(&xdp);
875 if (unlikely(!xdpf))
876 goto err_xdp;
877 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
878 if (unlikely(err < 0)) {
879 trace_xdp_exception(vi->dev, xdp_prog, act);
880 if (unlikely(xdp_page != page))
881 put_page(xdp_page);
882 goto err_xdp;
883 }
884 *xdp_xmit |= VIRTIO_XDP_TX;
885 if (unlikely(xdp_page != page))
886 put_page(page);
887 rcu_read_unlock();
888 goto xdp_xmit;
889 case XDP_REDIRECT:
890 stats->xdp_redirects++;
891 err = xdp_do_redirect(dev, &xdp, xdp_prog);
892 if (err) {
893 if (unlikely(xdp_page != page))
894 put_page(xdp_page);
895 goto err_xdp;
896 }
897 *xdp_xmit |= VIRTIO_XDP_REDIR;
898 if (unlikely(xdp_page != page))
899 put_page(page);
900 rcu_read_unlock();
901 goto xdp_xmit;
902 default:
903 bpf_warn_invalid_xdp_action(act);
904
905 case XDP_ABORTED:
906 trace_xdp_exception(vi->dev, xdp_prog, act);
907
908 case XDP_DROP:
909 if (unlikely(xdp_page != page))
910 __free_pages(xdp_page, 0);
911 goto err_xdp;
912 }
913 }
914 rcu_read_unlock();
915
916 truesize = mergeable_ctx_to_truesize(ctx);
917 if (unlikely(len > truesize)) {
918 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
919 dev->name, len, (unsigned long)ctx);
920 dev->stats.rx_length_errors++;
921 goto err_skb;
922 }
923
924 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog);
925 curr_skb = head_skb;
926
927 if (unlikely(!curr_skb))
928 goto err_skb;
929 while (--num_buf) {
930 int num_skb_frags;
931
932 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
933 if (unlikely(!buf)) {
934 pr_debug("%s: rx error: %d buffers out of %d missing\n",
935 dev->name, num_buf,
936 virtio16_to_cpu(vi->vdev,
937 hdr->num_buffers));
938 dev->stats.rx_length_errors++;
939 goto err_buf;
940 }
941
942 stats->bytes += len;
943 page = virt_to_head_page(buf);
944
945 truesize = mergeable_ctx_to_truesize(ctx);
946 if (unlikely(len > truesize)) {
947 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
948 dev->name, len, (unsigned long)ctx);
949 dev->stats.rx_length_errors++;
950 goto err_skb;
951 }
952
953 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
954 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
955 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
956
957 if (unlikely(!nskb))
958 goto err_skb;
959 if (curr_skb == head_skb)
960 skb_shinfo(curr_skb)->frag_list = nskb;
961 else
962 curr_skb->next = nskb;
963 curr_skb = nskb;
964 head_skb->truesize += nskb->truesize;
965 num_skb_frags = 0;
966 }
967 if (curr_skb != head_skb) {
968 head_skb->data_len += len;
969 head_skb->len += len;
970 head_skb->truesize += truesize;
971 }
972 offset = buf - page_address(page);
973 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
974 put_page(page);
975 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
976 len, truesize);
977 } else {
978 skb_add_rx_frag(curr_skb, num_skb_frags, page,
979 offset, len, truesize);
980 }
981 }
982
983 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
984 return head_skb;
985
986 err_xdp:
987 rcu_read_unlock();
988 stats->xdp_drops++;
989 err_skb:
990 put_page(page);
991 while (num_buf-- > 1) {
992 buf = virtqueue_get_buf(rq->vq, &len);
993 if (unlikely(!buf)) {
994 pr_debug("%s: rx error: %d buffers missing\n",
995 dev->name, num_buf);
996 dev->stats.rx_length_errors++;
997 break;
998 }
999 stats->bytes += len;
1000 page = virt_to_head_page(buf);
1001 put_page(page);
1002 }
1003 err_buf:
1004 stats->drops++;
1005 dev_kfree_skb(head_skb);
1006 xdp_xmit:
1007 return NULL;
1008 }
1009
1010 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
1011 void *buf, unsigned int len, void **ctx,
1012 unsigned int *xdp_xmit,
1013 struct virtnet_rq_stats *stats)
1014 {
1015 struct net_device *dev = vi->dev;
1016 struct sk_buff *skb;
1017 struct virtio_net_hdr_mrg_rxbuf *hdr;
1018
1019 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
1020 pr_debug("%s: short packet %i\n", dev->name, len);
1021 dev->stats.rx_length_errors++;
1022 if (vi->mergeable_rx_bufs) {
1023 put_page(virt_to_head_page(buf));
1024 } else if (vi->big_packets) {
1025 give_pages(rq, buf);
1026 } else {
1027 put_page(virt_to_head_page(buf));
1028 }
1029 return;
1030 }
1031
1032 if (vi->mergeable_rx_bufs)
1033 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
1034 stats);
1035 else if (vi->big_packets)
1036 skb = receive_big(dev, vi, rq, buf, len, stats);
1037 else
1038 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
1039
1040 if (unlikely(!skb))
1041 return;
1042
1043 hdr = skb_vnet_hdr(skb);
1044
1045 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
1046 skb->ip_summed = CHECKSUM_UNNECESSARY;
1047
1048 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
1049 virtio_is_little_endian(vi->vdev))) {
1050 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
1051 dev->name, hdr->hdr.gso_type,
1052 hdr->hdr.gso_size);
1053 goto frame_err;
1054 }
1055
1056 skb_record_rx_queue(skb, vq2rxq(rq->vq));
1057 skb->protocol = eth_type_trans(skb, dev);
1058 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
1059 ntohs(skb->protocol), skb->len, skb->pkt_type);
1060
1061 napi_gro_receive(&rq->napi, skb);
1062 return;
1063
1064 frame_err:
1065 dev->stats.rx_frame_errors++;
1066 dev_kfree_skb(skb);
1067 }
1068
1069
1070
1071
1072
1073
1074 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1075 gfp_t gfp)
1076 {
1077 struct page_frag *alloc_frag = &rq->alloc_frag;
1078 char *buf;
1079 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1080 void *ctx = (void *)(unsigned long)xdp_headroom;
1081 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1082 int err;
1083
1084 len = SKB_DATA_ALIGN(len) +
1085 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1086 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
1087 return -ENOMEM;
1088
1089 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1090 get_page(alloc_frag->page);
1091 alloc_frag->offset += len;
1092 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,
1093 vi->hdr_len + GOOD_PACKET_LEN);
1094 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1095 if (err < 0)
1096 put_page(virt_to_head_page(buf));
1097 return err;
1098 }
1099
1100 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1101 gfp_t gfp)
1102 {
1103 struct page *first, *list = NULL;
1104 char *p;
1105 int i, err, offset;
1106
1107 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
1108
1109
1110 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
1111 first = get_a_page(rq, gfp);
1112 if (!first) {
1113 if (list)
1114 give_pages(rq, list);
1115 return -ENOMEM;
1116 }
1117 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1118
1119
1120 first->private = (unsigned long)list;
1121 list = first;
1122 }
1123
1124 first = get_a_page(rq, gfp);
1125 if (!first) {
1126 give_pages(rq, list);
1127 return -ENOMEM;
1128 }
1129 p = page_address(first);
1130
1131
1132
1133 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1134
1135
1136 offset = sizeof(struct padded_vnet_hdr);
1137 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1138
1139
1140 first->private = (unsigned long)list;
1141 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
1142 first, gfp);
1143 if (err < 0)
1144 give_pages(rq, first);
1145
1146 return err;
1147 }
1148
1149 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1150 struct ewma_pkt_len *avg_pkt_len,
1151 unsigned int room)
1152 {
1153 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1154 unsigned int len;
1155
1156 if (room)
1157 return PAGE_SIZE - room;
1158
1159 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1160 rq->min_buf_len, PAGE_SIZE - hdr_len);
1161
1162 return ALIGN(len, L1_CACHE_BYTES);
1163 }
1164
1165 static int add_recvbuf_mergeable(struct virtnet_info *vi,
1166 struct receive_queue *rq, gfp_t gfp)
1167 {
1168 struct page_frag *alloc_frag = &rq->alloc_frag;
1169 unsigned int headroom = virtnet_get_headroom(vi);
1170 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1171 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1172 char *buf;
1173 void *ctx;
1174 int err;
1175 unsigned int len, hole;
1176
1177
1178
1179
1180
1181 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1182 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
1183 return -ENOMEM;
1184
1185 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1186 buf += headroom;
1187 get_page(alloc_frag->page);
1188 alloc_frag->offset += len + room;
1189 hole = alloc_frag->size - alloc_frag->offset;
1190 if (hole < len + room) {
1191
1192
1193
1194
1195 len += hole;
1196 alloc_frag->offset += hole;
1197 }
1198
1199 sg_init_one(rq->sg, buf, len);
1200 ctx = mergeable_len_to_ctx(len, headroom);
1201 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1202 if (err < 0)
1203 put_page(virt_to_head_page(buf));
1204
1205 return err;
1206 }
1207
1208
1209
1210
1211
1212
1213
1214
1215 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
1216 gfp_t gfp)
1217 {
1218 int err;
1219 bool oom;
1220
1221 do {
1222 if (vi->mergeable_rx_bufs)
1223 err = add_recvbuf_mergeable(vi, rq, gfp);
1224 else if (vi->big_packets)
1225 err = add_recvbuf_big(vi, rq, gfp);
1226 else
1227 err = add_recvbuf_small(vi, rq, gfp);
1228
1229 oom = err == -ENOMEM;
1230 if (err)
1231 break;
1232 } while (rq->vq->num_free);
1233 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
1234 unsigned long flags;
1235
1236 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
1237 rq->stats.kicks++;
1238 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
1239 }
1240
1241 return !oom;
1242 }
1243
1244 static void skb_recv_done(struct virtqueue *rvq)
1245 {
1246 struct virtnet_info *vi = rvq->vdev->priv;
1247 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
1248
1249 virtqueue_napi_schedule(&rq->napi, rvq);
1250 }
1251
1252 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
1253 {
1254 napi_enable(napi);
1255
1256
1257
1258
1259
1260 local_bh_disable();
1261 virtqueue_napi_schedule(napi, vq);
1262 local_bh_enable();
1263 }
1264
1265 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
1266 struct virtqueue *vq,
1267 struct napi_struct *napi)
1268 {
1269 if (!napi->weight)
1270 return;
1271
1272
1273
1274
1275 if (!vi->affinity_hint_set) {
1276 napi->weight = 0;
1277 return;
1278 }
1279
1280 return virtnet_napi_enable(vq, napi);
1281 }
1282
1283 static void virtnet_napi_tx_disable(struct napi_struct *napi)
1284 {
1285 if (napi->weight)
1286 napi_disable(napi);
1287 }
1288
1289 static void refill_work(struct work_struct *work)
1290 {
1291 struct virtnet_info *vi =
1292 container_of(work, struct virtnet_info, refill.work);
1293 bool still_empty;
1294 int i;
1295
1296 for (i = 0; i < vi->curr_queue_pairs; i++) {
1297 struct receive_queue *rq = &vi->rq[i];
1298
1299 napi_disable(&rq->napi);
1300 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
1301 virtnet_napi_enable(rq->vq, &rq->napi);
1302
1303
1304
1305
1306 if (still_empty)
1307 schedule_delayed_work(&vi->refill, HZ/2);
1308 }
1309 }
1310
1311 static int virtnet_receive(struct receive_queue *rq, int budget,
1312 unsigned int *xdp_xmit)
1313 {
1314 struct virtnet_info *vi = rq->vq->vdev->priv;
1315 struct virtnet_rq_stats stats = {};
1316 unsigned int len;
1317 void *buf;
1318 int i;
1319
1320 if (!vi->big_packets || vi->mergeable_rx_bufs) {
1321 void *ctx;
1322
1323 while (stats.packets < budget &&
1324 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
1325 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
1326 stats.packets++;
1327 }
1328 } else {
1329 while (stats.packets < budget &&
1330 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
1331 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
1332 stats.packets++;
1333 }
1334 }
1335
1336 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
1337 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
1338 schedule_delayed_work(&vi->refill, 0);
1339 }
1340
1341 u64_stats_update_begin(&rq->stats.syncp);
1342 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
1343 size_t offset = virtnet_rq_stats_desc[i].offset;
1344 u64 *item;
1345
1346 item = (u64 *)((u8 *)&rq->stats + offset);
1347 *item += *(u64 *)((u8 *)&stats + offset);
1348 }
1349 u64_stats_update_end(&rq->stats.syncp);
1350
1351 return stats.packets;
1352 }
1353
1354 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
1355 {
1356 unsigned int len;
1357 unsigned int packets = 0;
1358 unsigned int bytes = 0;
1359 void *ptr;
1360
1361 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1362 if (likely(!is_xdp_frame(ptr))) {
1363 struct sk_buff *skb = ptr;
1364
1365 pr_debug("Sent skb %p\n", skb);
1366
1367 bytes += skb->len;
1368 napi_consume_skb(skb, in_napi);
1369 } else {
1370 struct xdp_frame *frame = ptr_to_xdp(ptr);
1371
1372 bytes += frame->len;
1373 xdp_return_frame(frame);
1374 }
1375 packets++;
1376 }
1377
1378
1379
1380
1381 if (!packets)
1382 return;
1383
1384 u64_stats_update_begin(&sq->stats.syncp);
1385 sq->stats.bytes += bytes;
1386 sq->stats.packets += packets;
1387 u64_stats_update_end(&sq->stats.syncp);
1388 }
1389
1390 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
1391 {
1392 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1393 return false;
1394 else if (q < vi->curr_queue_pairs)
1395 return true;
1396 else
1397 return false;
1398 }
1399
1400 static void virtnet_poll_cleantx(struct receive_queue *rq)
1401 {
1402 struct virtnet_info *vi = rq->vq->vdev->priv;
1403 unsigned int index = vq2rxq(rq->vq);
1404 struct send_queue *sq = &vi->sq[index];
1405 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
1406
1407 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
1408 return;
1409
1410 if (__netif_tx_trylock(txq)) {
1411 free_old_xmit_skbs(sq, true);
1412 __netif_tx_unlock(txq);
1413 }
1414
1415 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1416 netif_tx_wake_queue(txq);
1417 }
1418
1419 static int virtnet_poll(struct napi_struct *napi, int budget)
1420 {
1421 struct receive_queue *rq =
1422 container_of(napi, struct receive_queue, napi);
1423 struct virtnet_info *vi = rq->vq->vdev->priv;
1424 struct send_queue *sq;
1425 unsigned int received;
1426 unsigned int xdp_xmit = 0;
1427
1428 virtnet_poll_cleantx(rq);
1429
1430 received = virtnet_receive(rq, budget, &xdp_xmit);
1431
1432
1433 if (received < budget)
1434 virtqueue_napi_complete(napi, rq->vq, received);
1435
1436 if (xdp_xmit & VIRTIO_XDP_REDIR)
1437 xdp_do_flush_map();
1438
1439 if (xdp_xmit & VIRTIO_XDP_TX) {
1440 sq = virtnet_xdp_sq(vi);
1441 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1442 u64_stats_update_begin(&sq->stats.syncp);
1443 sq->stats.kicks++;
1444 u64_stats_update_end(&sq->stats.syncp);
1445 }
1446 }
1447
1448 return received;
1449 }
1450
1451 static int virtnet_open(struct net_device *dev)
1452 {
1453 struct virtnet_info *vi = netdev_priv(dev);
1454 int i, err;
1455
1456 for (i = 0; i < vi->max_queue_pairs; i++) {
1457 if (i < vi->curr_queue_pairs)
1458
1459 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1460 schedule_delayed_work(&vi->refill, 0);
1461
1462 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i);
1463 if (err < 0)
1464 return err;
1465
1466 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
1467 MEM_TYPE_PAGE_SHARED, NULL);
1468 if (err < 0) {
1469 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1470 return err;
1471 }
1472
1473 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
1474 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
1475 }
1476
1477 return 0;
1478 }
1479
1480 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
1481 {
1482 struct send_queue *sq = container_of(napi, struct send_queue, napi);
1483 struct virtnet_info *vi = sq->vq->vdev->priv;
1484 unsigned int index = vq2txq(sq->vq);
1485 struct netdev_queue *txq;
1486
1487 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
1488
1489 napi_complete_done(napi, 0);
1490 return 0;
1491 }
1492
1493 txq = netdev_get_tx_queue(vi->dev, index);
1494 __netif_tx_lock(txq, raw_smp_processor_id());
1495 free_old_xmit_skbs(sq, true);
1496 __netif_tx_unlock(txq);
1497
1498 virtqueue_napi_complete(napi, sq->vq, 0);
1499
1500 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1501 netif_tx_wake_queue(txq);
1502
1503 return 0;
1504 }
1505
1506 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1507 {
1508 struct virtio_net_hdr_mrg_rxbuf *hdr;
1509 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1510 struct virtnet_info *vi = sq->vq->vdev->priv;
1511 int num_sg;
1512 unsigned hdr_len = vi->hdr_len;
1513 bool can_push;
1514
1515 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1516
1517 can_push = vi->any_header_sg &&
1518 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1519 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1520
1521
1522 if (can_push)
1523 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1524 else
1525 hdr = skb_vnet_hdr(skb);
1526
1527 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1528 virtio_is_little_endian(vi->vdev), false,
1529 0))
1530 BUG();
1531
1532 if (vi->mergeable_rx_bufs)
1533 hdr->num_buffers = 0;
1534
1535 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1536 if (can_push) {
1537 __skb_push(skb, hdr_len);
1538 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1539 if (unlikely(num_sg < 0))
1540 return num_sg;
1541
1542 __skb_pull(skb, hdr_len);
1543 } else {
1544 sg_set_buf(sq->sg, hdr, hdr_len);
1545 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
1546 if (unlikely(num_sg < 0))
1547 return num_sg;
1548 num_sg++;
1549 }
1550 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1551 }
1552
1553 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1554 {
1555 struct virtnet_info *vi = netdev_priv(dev);
1556 int qnum = skb_get_queue_mapping(skb);
1557 struct send_queue *sq = &vi->sq[qnum];
1558 int err;
1559 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1560 bool kick = !netdev_xmit_more();
1561 bool use_napi = sq->napi.weight;
1562
1563
1564 free_old_xmit_skbs(sq, false);
1565
1566 if (use_napi && kick)
1567 virtqueue_enable_cb_delayed(sq->vq);
1568
1569
1570 skb_tx_timestamp(skb);
1571
1572
1573 err = xmit_skb(sq, skb);
1574
1575
1576 if (unlikely(err)) {
1577 dev->stats.tx_fifo_errors++;
1578 if (net_ratelimit())
1579 dev_warn(&dev->dev,
1580 "Unexpected TXQ (%d) queue failure: %d\n",
1581 qnum, err);
1582 dev->stats.tx_dropped++;
1583 dev_kfree_skb_any(skb);
1584 return NETDEV_TX_OK;
1585 }
1586
1587
1588 if (!use_napi) {
1589 skb_orphan(skb);
1590 nf_reset_ct(skb);
1591 }
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1604 netif_stop_subqueue(dev, qnum);
1605 if (!use_napi &&
1606 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1607
1608 free_old_xmit_skbs(sq, false);
1609 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1610 netif_start_subqueue(dev, qnum);
1611 virtqueue_disable_cb(sq->vq);
1612 }
1613 }
1614 }
1615
1616 if (kick || netif_xmit_stopped(txq)) {
1617 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1618 u64_stats_update_begin(&sq->stats.syncp);
1619 sq->stats.kicks++;
1620 u64_stats_update_end(&sq->stats.syncp);
1621 }
1622 }
1623
1624 return NETDEV_TX_OK;
1625 }
1626
1627
1628
1629
1630
1631
1632 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1633 struct scatterlist *out)
1634 {
1635 struct scatterlist *sgs[4], hdr, stat;
1636 unsigned out_num = 0, tmp;
1637
1638
1639 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1640
1641 vi->ctrl->status = ~0;
1642 vi->ctrl->hdr.class = class;
1643 vi->ctrl->hdr.cmd = cmd;
1644
1645 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
1646 sgs[out_num++] = &hdr;
1647
1648 if (out)
1649 sgs[out_num++] = out;
1650
1651
1652 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
1653 sgs[out_num] = &stat;
1654
1655 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1656 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1657
1658 if (unlikely(!virtqueue_kick(vi->cvq)))
1659 return vi->ctrl->status == VIRTIO_NET_OK;
1660
1661
1662
1663
1664 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1665 !virtqueue_is_broken(vi->cvq))
1666 cpu_relax();
1667
1668 return vi->ctrl->status == VIRTIO_NET_OK;
1669 }
1670
1671 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1672 {
1673 struct virtnet_info *vi = netdev_priv(dev);
1674 struct virtio_device *vdev = vi->vdev;
1675 int ret;
1676 struct sockaddr *addr;
1677 struct scatterlist sg;
1678
1679 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
1680 return -EOPNOTSUPP;
1681
1682 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
1683 if (!addr)
1684 return -ENOMEM;
1685
1686 ret = eth_prepare_mac_addr_change(dev, addr);
1687 if (ret)
1688 goto out;
1689
1690 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1691 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1692 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1693 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1694 dev_warn(&vdev->dev,
1695 "Failed to set mac address by vq command.\n");
1696 ret = -EINVAL;
1697 goto out;
1698 }
1699 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1700 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1701 unsigned int i;
1702
1703
1704 for (i = 0; i < dev->addr_len; i++)
1705 virtio_cwrite8(vdev,
1706 offsetof(struct virtio_net_config, mac) +
1707 i, addr->sa_data[i]);
1708 }
1709
1710 eth_commit_mac_addr_change(dev, p);
1711 ret = 0;
1712
1713 out:
1714 kfree(addr);
1715 return ret;
1716 }
1717
1718 static void virtnet_stats(struct net_device *dev,
1719 struct rtnl_link_stats64 *tot)
1720 {
1721 struct virtnet_info *vi = netdev_priv(dev);
1722 unsigned int start;
1723 int i;
1724
1725 for (i = 0; i < vi->max_queue_pairs; i++) {
1726 u64 tpackets, tbytes, rpackets, rbytes, rdrops;
1727 struct receive_queue *rq = &vi->rq[i];
1728 struct send_queue *sq = &vi->sq[i];
1729
1730 do {
1731 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
1732 tpackets = sq->stats.packets;
1733 tbytes = sq->stats.bytes;
1734 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
1735
1736 do {
1737 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
1738 rpackets = rq->stats.packets;
1739 rbytes = rq->stats.bytes;
1740 rdrops = rq->stats.drops;
1741 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
1742
1743 tot->rx_packets += rpackets;
1744 tot->tx_packets += tpackets;
1745 tot->rx_bytes += rbytes;
1746 tot->tx_bytes += tbytes;
1747 tot->rx_dropped += rdrops;
1748 }
1749
1750 tot->tx_dropped = dev->stats.tx_dropped;
1751 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1752 tot->rx_length_errors = dev->stats.rx_length_errors;
1753 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1754 }
1755
1756 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1757 {
1758 rtnl_lock();
1759 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1760 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1761 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1762 rtnl_unlock();
1763 }
1764
1765 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1766 {
1767 struct scatterlist sg;
1768 struct net_device *dev = vi->dev;
1769
1770 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1771 return 0;
1772
1773 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1774 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
1775
1776 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1777 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1778 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1779 queue_pairs);
1780 return -EINVAL;
1781 } else {
1782 vi->curr_queue_pairs = queue_pairs;
1783
1784 if (dev->flags & IFF_UP)
1785 schedule_delayed_work(&vi->refill, 0);
1786 }
1787
1788 return 0;
1789 }
1790
1791 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1792 {
1793 int err;
1794
1795 rtnl_lock();
1796 err = _virtnet_set_queues(vi, queue_pairs);
1797 rtnl_unlock();
1798 return err;
1799 }
1800
1801 static int virtnet_close(struct net_device *dev)
1802 {
1803 struct virtnet_info *vi = netdev_priv(dev);
1804 int i;
1805
1806
1807 cancel_delayed_work_sync(&vi->refill);
1808
1809 for (i = 0; i < vi->max_queue_pairs; i++) {
1810 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1811 napi_disable(&vi->rq[i].napi);
1812 virtnet_napi_tx_disable(&vi->sq[i].napi);
1813 }
1814
1815 return 0;
1816 }
1817
1818 static void virtnet_set_rx_mode(struct net_device *dev)
1819 {
1820 struct virtnet_info *vi = netdev_priv(dev);
1821 struct scatterlist sg[2];
1822 struct virtio_net_ctrl_mac *mac_data;
1823 struct netdev_hw_addr *ha;
1824 int uc_count;
1825 int mc_count;
1826 void *buf;
1827 int i;
1828
1829
1830 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1831 return;
1832
1833 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
1834 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1835
1836 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
1837
1838 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1839 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1840 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1841 vi->ctrl->promisc ? "en" : "dis");
1842
1843 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
1844
1845 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1846 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1847 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1848 vi->ctrl->allmulti ? "en" : "dis");
1849
1850 uc_count = netdev_uc_count(dev);
1851 mc_count = netdev_mc_count(dev);
1852
1853 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1854 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1855 mac_data = buf;
1856 if (!buf)
1857 return;
1858
1859 sg_init_table(sg, 2);
1860
1861
1862 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1863 i = 0;
1864 netdev_for_each_uc_addr(ha, dev)
1865 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1866
1867 sg_set_buf(&sg[0], mac_data,
1868 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1869
1870
1871 mac_data = (void *)&mac_data->macs[uc_count][0];
1872
1873 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1874 i = 0;
1875 netdev_for_each_mc_addr(ha, dev)
1876 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1877
1878 sg_set_buf(&sg[1], mac_data,
1879 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1880
1881 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1882 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1883 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1884
1885 kfree(buf);
1886 }
1887
1888 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1889 __be16 proto, u16 vid)
1890 {
1891 struct virtnet_info *vi = netdev_priv(dev);
1892 struct scatterlist sg;
1893
1894 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1895 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1896
1897 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1898 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1899 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1900 return 0;
1901 }
1902
1903 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1904 __be16 proto, u16 vid)
1905 {
1906 struct virtnet_info *vi = netdev_priv(dev);
1907 struct scatterlist sg;
1908
1909 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1910 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1911
1912 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1913 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1914 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1915 return 0;
1916 }
1917
1918 static void virtnet_clean_affinity(struct virtnet_info *vi)
1919 {
1920 int i;
1921
1922 if (vi->affinity_hint_set) {
1923 for (i = 0; i < vi->max_queue_pairs; i++) {
1924 virtqueue_set_affinity(vi->rq[i].vq, NULL);
1925 virtqueue_set_affinity(vi->sq[i].vq, NULL);
1926 }
1927
1928 vi->affinity_hint_set = false;
1929 }
1930 }
1931
1932 static void virtnet_set_affinity(struct virtnet_info *vi)
1933 {
1934 cpumask_var_t mask;
1935 int stragglers;
1936 int group_size;
1937 int i, j, cpu;
1938 int num_cpu;
1939 int stride;
1940
1941 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
1942 virtnet_clean_affinity(vi);
1943 return;
1944 }
1945
1946 num_cpu = num_online_cpus();
1947 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
1948 stragglers = num_cpu >= vi->curr_queue_pairs ?
1949 num_cpu % vi->curr_queue_pairs :
1950 0;
1951 cpu = cpumask_next(-1, cpu_online_mask);
1952
1953 for (i = 0; i < vi->curr_queue_pairs; i++) {
1954 group_size = stride + (i < stragglers ? 1 : 0);
1955
1956 for (j = 0; j < group_size; j++) {
1957 cpumask_set_cpu(cpu, mask);
1958 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
1959 nr_cpu_ids, false);
1960 }
1961 virtqueue_set_affinity(vi->rq[i].vq, mask);
1962 virtqueue_set_affinity(vi->sq[i].vq, mask);
1963 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false);
1964 cpumask_clear(mask);
1965 }
1966
1967 vi->affinity_hint_set = true;
1968 free_cpumask_var(mask);
1969 }
1970
1971 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
1972 {
1973 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1974 node);
1975 virtnet_set_affinity(vi);
1976 return 0;
1977 }
1978
1979 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
1980 {
1981 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1982 node_dead);
1983 virtnet_set_affinity(vi);
1984 return 0;
1985 }
1986
1987 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
1988 {
1989 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1990 node);
1991
1992 virtnet_clean_affinity(vi);
1993 return 0;
1994 }
1995
1996 static enum cpuhp_state virtionet_online;
1997
1998 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
1999 {
2000 int ret;
2001
2002 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
2003 if (ret)
2004 return ret;
2005 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2006 &vi->node_dead);
2007 if (!ret)
2008 return ret;
2009 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2010 return ret;
2011 }
2012
2013 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
2014 {
2015 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2016 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2017 &vi->node_dead);
2018 }
2019
2020 static void virtnet_get_ringparam(struct net_device *dev,
2021 struct ethtool_ringparam *ring)
2022 {
2023 struct virtnet_info *vi = netdev_priv(dev);
2024
2025 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
2026 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
2027 ring->rx_pending = ring->rx_max_pending;
2028 ring->tx_pending = ring->tx_max_pending;
2029 }
2030
2031
2032 static void virtnet_get_drvinfo(struct net_device *dev,
2033 struct ethtool_drvinfo *info)
2034 {
2035 struct virtnet_info *vi = netdev_priv(dev);
2036 struct virtio_device *vdev = vi->vdev;
2037
2038 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
2039 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
2040 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
2041
2042 }
2043
2044
2045 static int virtnet_set_channels(struct net_device *dev,
2046 struct ethtool_channels *channels)
2047 {
2048 struct virtnet_info *vi = netdev_priv(dev);
2049 u16 queue_pairs = channels->combined_count;
2050 int err;
2051
2052
2053
2054
2055 if (channels->rx_count || channels->tx_count || channels->other_count)
2056 return -EINVAL;
2057
2058 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
2059 return -EINVAL;
2060
2061
2062
2063
2064
2065 if (vi->rq[0].xdp_prog)
2066 return -EINVAL;
2067
2068 get_online_cpus();
2069 err = _virtnet_set_queues(vi, queue_pairs);
2070 if (!err) {
2071 netif_set_real_num_tx_queues(dev, queue_pairs);
2072 netif_set_real_num_rx_queues(dev, queue_pairs);
2073
2074 virtnet_set_affinity(vi);
2075 }
2076 put_online_cpus();
2077
2078 return err;
2079 }
2080
2081 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2082 {
2083 struct virtnet_info *vi = netdev_priv(dev);
2084 char *p = (char *)data;
2085 unsigned int i, j;
2086
2087 switch (stringset) {
2088 case ETH_SS_STATS:
2089 for (i = 0; i < vi->curr_queue_pairs; i++) {
2090 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2091 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s",
2092 i, virtnet_rq_stats_desc[j].desc);
2093 p += ETH_GSTRING_LEN;
2094 }
2095 }
2096
2097 for (i = 0; i < vi->curr_queue_pairs; i++) {
2098 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2099 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s",
2100 i, virtnet_sq_stats_desc[j].desc);
2101 p += ETH_GSTRING_LEN;
2102 }
2103 }
2104 break;
2105 }
2106 }
2107
2108 static int virtnet_get_sset_count(struct net_device *dev, int sset)
2109 {
2110 struct virtnet_info *vi = netdev_priv(dev);
2111
2112 switch (sset) {
2113 case ETH_SS_STATS:
2114 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
2115 VIRTNET_SQ_STATS_LEN);
2116 default:
2117 return -EOPNOTSUPP;
2118 }
2119 }
2120
2121 static void virtnet_get_ethtool_stats(struct net_device *dev,
2122 struct ethtool_stats *stats, u64 *data)
2123 {
2124 struct virtnet_info *vi = netdev_priv(dev);
2125 unsigned int idx = 0, start, i, j;
2126 const u8 *stats_base;
2127 size_t offset;
2128
2129 for (i = 0; i < vi->curr_queue_pairs; i++) {
2130 struct receive_queue *rq = &vi->rq[i];
2131
2132 stats_base = (u8 *)&rq->stats;
2133 do {
2134 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
2135 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2136 offset = virtnet_rq_stats_desc[j].offset;
2137 data[idx + j] = *(u64 *)(stats_base + offset);
2138 }
2139 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
2140 idx += VIRTNET_RQ_STATS_LEN;
2141 }
2142
2143 for (i = 0; i < vi->curr_queue_pairs; i++) {
2144 struct send_queue *sq = &vi->sq[i];
2145
2146 stats_base = (u8 *)&sq->stats;
2147 do {
2148 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
2149 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2150 offset = virtnet_sq_stats_desc[j].offset;
2151 data[idx + j] = *(u64 *)(stats_base + offset);
2152 }
2153 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
2154 idx += VIRTNET_SQ_STATS_LEN;
2155 }
2156 }
2157
2158 static void virtnet_get_channels(struct net_device *dev,
2159 struct ethtool_channels *channels)
2160 {
2161 struct virtnet_info *vi = netdev_priv(dev);
2162
2163 channels->combined_count = vi->curr_queue_pairs;
2164 channels->max_combined = vi->max_queue_pairs;
2165 channels->max_other = 0;
2166 channels->rx_count = 0;
2167 channels->tx_count = 0;
2168 channels->other_count = 0;
2169 }
2170
2171
2172 static bool
2173 virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd)
2174 {
2175 struct ethtool_link_ksettings diff1 = *cmd;
2176 struct ethtool_link_ksettings diff2 = {};
2177
2178
2179
2180
2181 diff1.base.speed = 0;
2182 diff2.base.port = PORT_OTHER;
2183 ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
2184 diff1.base.duplex = 0;
2185 diff1.base.cmd = 0;
2186 diff1.base.link_mode_masks_nwords = 0;
2187
2188 return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) &&
2189 bitmap_empty(diff1.link_modes.supported,
2190 __ETHTOOL_LINK_MODE_MASK_NBITS) &&
2191 bitmap_empty(diff1.link_modes.advertising,
2192 __ETHTOOL_LINK_MODE_MASK_NBITS) &&
2193 bitmap_empty(diff1.link_modes.lp_advertising,
2194 __ETHTOOL_LINK_MODE_MASK_NBITS);
2195 }
2196
2197 static int virtnet_set_link_ksettings(struct net_device *dev,
2198 const struct ethtool_link_ksettings *cmd)
2199 {
2200 struct virtnet_info *vi = netdev_priv(dev);
2201 u32 speed;
2202
2203 speed = cmd->base.speed;
2204
2205 if (!ethtool_validate_speed(speed) ||
2206 !ethtool_validate_duplex(cmd->base.duplex) ||
2207 !virtnet_validate_ethtool_cmd(cmd))
2208 return -EINVAL;
2209 vi->speed = speed;
2210 vi->duplex = cmd->base.duplex;
2211
2212 return 0;
2213 }
2214
2215 static int virtnet_get_link_ksettings(struct net_device *dev,
2216 struct ethtool_link_ksettings *cmd)
2217 {
2218 struct virtnet_info *vi = netdev_priv(dev);
2219
2220 cmd->base.speed = vi->speed;
2221 cmd->base.duplex = vi->duplex;
2222 cmd->base.port = PORT_OTHER;
2223
2224 return 0;
2225 }
2226
2227 static int virtnet_set_coalesce(struct net_device *dev,
2228 struct ethtool_coalesce *ec)
2229 {
2230 struct ethtool_coalesce ec_default = {
2231 .cmd = ETHTOOL_SCOALESCE,
2232 .rx_max_coalesced_frames = 1,
2233 };
2234 struct virtnet_info *vi = netdev_priv(dev);
2235 int i, napi_weight;
2236
2237 if (ec->tx_max_coalesced_frames > 1)
2238 return -EINVAL;
2239
2240 ec_default.tx_max_coalesced_frames = ec->tx_max_coalesced_frames;
2241 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
2242
2243
2244 if (memcmp(ec, &ec_default, sizeof(ec_default)))
2245 return -EINVAL;
2246
2247 if (napi_weight ^ vi->sq[0].napi.weight) {
2248 if (dev->flags & IFF_UP)
2249 return -EBUSY;
2250 for (i = 0; i < vi->max_queue_pairs; i++)
2251 vi->sq[i].napi.weight = napi_weight;
2252 }
2253
2254 return 0;
2255 }
2256
2257 static int virtnet_get_coalesce(struct net_device *dev,
2258 struct ethtool_coalesce *ec)
2259 {
2260 struct ethtool_coalesce ec_default = {
2261 .cmd = ETHTOOL_GCOALESCE,
2262 .rx_max_coalesced_frames = 1,
2263 };
2264 struct virtnet_info *vi = netdev_priv(dev);
2265
2266 memcpy(ec, &ec_default, sizeof(ec_default));
2267
2268 if (vi->sq[0].napi.weight)
2269 ec->tx_max_coalesced_frames = 1;
2270
2271 return 0;
2272 }
2273
2274 static void virtnet_init_settings(struct net_device *dev)
2275 {
2276 struct virtnet_info *vi = netdev_priv(dev);
2277
2278 vi->speed = SPEED_UNKNOWN;
2279 vi->duplex = DUPLEX_UNKNOWN;
2280 }
2281
2282 static void virtnet_update_settings(struct virtnet_info *vi)
2283 {
2284 u32 speed;
2285 u8 duplex;
2286
2287 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
2288 return;
2289
2290 speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config,
2291 speed));
2292 if (ethtool_validate_speed(speed))
2293 vi->speed = speed;
2294 duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config,
2295 duplex));
2296 if (ethtool_validate_duplex(duplex))
2297 vi->duplex = duplex;
2298 }
2299
2300 static const struct ethtool_ops virtnet_ethtool_ops = {
2301 .get_drvinfo = virtnet_get_drvinfo,
2302 .get_link = ethtool_op_get_link,
2303 .get_ringparam = virtnet_get_ringparam,
2304 .get_strings = virtnet_get_strings,
2305 .get_sset_count = virtnet_get_sset_count,
2306 .get_ethtool_stats = virtnet_get_ethtool_stats,
2307 .set_channels = virtnet_set_channels,
2308 .get_channels = virtnet_get_channels,
2309 .get_ts_info = ethtool_op_get_ts_info,
2310 .get_link_ksettings = virtnet_get_link_ksettings,
2311 .set_link_ksettings = virtnet_set_link_ksettings,
2312 .set_coalesce = virtnet_set_coalesce,
2313 .get_coalesce = virtnet_get_coalesce,
2314 };
2315
2316 static void virtnet_freeze_down(struct virtio_device *vdev)
2317 {
2318 struct virtnet_info *vi = vdev->priv;
2319 int i;
2320
2321
2322 flush_work(&vi->config_work);
2323
2324 netif_tx_lock_bh(vi->dev);
2325 netif_device_detach(vi->dev);
2326 netif_tx_unlock_bh(vi->dev);
2327 cancel_delayed_work_sync(&vi->refill);
2328
2329 if (netif_running(vi->dev)) {
2330 for (i = 0; i < vi->max_queue_pairs; i++) {
2331 napi_disable(&vi->rq[i].napi);
2332 virtnet_napi_tx_disable(&vi->sq[i].napi);
2333 }
2334 }
2335 }
2336
2337 static int init_vqs(struct virtnet_info *vi);
2338
2339 static int virtnet_restore_up(struct virtio_device *vdev)
2340 {
2341 struct virtnet_info *vi = vdev->priv;
2342 int err, i;
2343
2344 err = init_vqs(vi);
2345 if (err)
2346 return err;
2347
2348 virtio_device_ready(vdev);
2349
2350 if (netif_running(vi->dev)) {
2351 for (i = 0; i < vi->curr_queue_pairs; i++)
2352 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2353 schedule_delayed_work(&vi->refill, 0);
2354
2355 for (i = 0; i < vi->max_queue_pairs; i++) {
2356 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2357 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2358 &vi->sq[i].napi);
2359 }
2360 }
2361
2362 netif_tx_lock_bh(vi->dev);
2363 netif_device_attach(vi->dev);
2364 netif_tx_unlock_bh(vi->dev);
2365 return err;
2366 }
2367
2368 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
2369 {
2370 struct scatterlist sg;
2371 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
2372
2373 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
2374
2375 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
2376 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
2377 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
2378 return -EINVAL;
2379 }
2380
2381 return 0;
2382 }
2383
2384 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
2385 {
2386 u64 offloads = 0;
2387
2388 if (!vi->guest_offloads)
2389 return 0;
2390
2391 return virtnet_set_guest_offloads(vi, offloads);
2392 }
2393
2394 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
2395 {
2396 u64 offloads = vi->guest_offloads;
2397
2398 if (!vi->guest_offloads)
2399 return 0;
2400
2401 return virtnet_set_guest_offloads(vi, offloads);
2402 }
2403
2404 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
2405 struct netlink_ext_ack *extack)
2406 {
2407 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
2408 struct virtnet_info *vi = netdev_priv(dev);
2409 struct bpf_prog *old_prog;
2410 u16 xdp_qp = 0, curr_qp;
2411 int i, err;
2412
2413 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
2414 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2415 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2416 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
2417 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
2418 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
2419 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first");
2420 return -EOPNOTSUPP;
2421 }
2422
2423 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
2424 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
2425 return -EINVAL;
2426 }
2427
2428 if (dev->mtu > max_sz) {
2429 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
2430 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
2431 return -EINVAL;
2432 }
2433
2434 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
2435 if (prog)
2436 xdp_qp = nr_cpu_ids;
2437
2438
2439 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
2440 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available");
2441 netdev_warn(dev, "request %i queues but max is %i\n",
2442 curr_qp + xdp_qp, vi->max_queue_pairs);
2443 return -ENOMEM;
2444 }
2445
2446 old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
2447 if (!prog && !old_prog)
2448 return 0;
2449
2450 if (prog) {
2451 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1);
2452 if (IS_ERR(prog))
2453 return PTR_ERR(prog);
2454 }
2455
2456
2457 if (netif_running(dev)) {
2458 for (i = 0; i < vi->max_queue_pairs; i++) {
2459 napi_disable(&vi->rq[i].napi);
2460 virtnet_napi_tx_disable(&vi->sq[i].napi);
2461 }
2462 }
2463
2464 if (!prog) {
2465 for (i = 0; i < vi->max_queue_pairs; i++) {
2466 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2467 if (i == 0)
2468 virtnet_restore_guest_offloads(vi);
2469 }
2470 synchronize_net();
2471 }
2472
2473 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
2474 if (err)
2475 goto err;
2476 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
2477 vi->xdp_queue_pairs = xdp_qp;
2478
2479 if (prog) {
2480 for (i = 0; i < vi->max_queue_pairs; i++) {
2481 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2482 if (i == 0 && !old_prog)
2483 virtnet_clear_guest_offloads(vi);
2484 }
2485 }
2486
2487 for (i = 0; i < vi->max_queue_pairs; i++) {
2488 if (old_prog)
2489 bpf_prog_put(old_prog);
2490 if (netif_running(dev)) {
2491 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2492 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2493 &vi->sq[i].napi);
2494 }
2495 }
2496
2497 return 0;
2498
2499 err:
2500 if (!prog) {
2501 virtnet_clear_guest_offloads(vi);
2502 for (i = 0; i < vi->max_queue_pairs; i++)
2503 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
2504 }
2505
2506 if (netif_running(dev)) {
2507 for (i = 0; i < vi->max_queue_pairs; i++) {
2508 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2509 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2510 &vi->sq[i].napi);
2511 }
2512 }
2513 if (prog)
2514 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
2515 return err;
2516 }
2517
2518 static u32 virtnet_xdp_query(struct net_device *dev)
2519 {
2520 struct virtnet_info *vi = netdev_priv(dev);
2521 const struct bpf_prog *xdp_prog;
2522 int i;
2523
2524 for (i = 0; i < vi->max_queue_pairs; i++) {
2525 xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2526 if (xdp_prog)
2527 return xdp_prog->aux->id;
2528 }
2529 return 0;
2530 }
2531
2532 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
2533 {
2534 switch (xdp->command) {
2535 case XDP_SETUP_PROG:
2536 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
2537 case XDP_QUERY_PROG:
2538 xdp->prog_id = virtnet_xdp_query(dev);
2539 return 0;
2540 default:
2541 return -EINVAL;
2542 }
2543 }
2544
2545 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
2546 size_t len)
2547 {
2548 struct virtnet_info *vi = netdev_priv(dev);
2549 int ret;
2550
2551 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2552 return -EOPNOTSUPP;
2553
2554 ret = snprintf(buf, len, "sby");
2555 if (ret >= len)
2556 return -EOPNOTSUPP;
2557
2558 return 0;
2559 }
2560
2561 static int virtnet_set_features(struct net_device *dev,
2562 netdev_features_t features)
2563 {
2564 struct virtnet_info *vi = netdev_priv(dev);
2565 u64 offloads;
2566 int err;
2567
2568 if ((dev->features ^ features) & NETIF_F_LRO) {
2569 if (vi->xdp_queue_pairs)
2570 return -EBUSY;
2571
2572 if (features & NETIF_F_LRO)
2573 offloads = vi->guest_offloads_capable;
2574 else
2575 offloads = 0;
2576
2577 err = virtnet_set_guest_offloads(vi, offloads);
2578 if (err)
2579 return err;
2580 vi->guest_offloads = offloads;
2581 }
2582
2583 return 0;
2584 }
2585
2586 static const struct net_device_ops virtnet_netdev = {
2587 .ndo_open = virtnet_open,
2588 .ndo_stop = virtnet_close,
2589 .ndo_start_xmit = start_xmit,
2590 .ndo_validate_addr = eth_validate_addr,
2591 .ndo_set_mac_address = virtnet_set_mac_address,
2592 .ndo_set_rx_mode = virtnet_set_rx_mode,
2593 .ndo_get_stats64 = virtnet_stats,
2594 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
2595 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
2596 .ndo_bpf = virtnet_xdp,
2597 .ndo_xdp_xmit = virtnet_xdp_xmit,
2598 .ndo_features_check = passthru_features_check,
2599 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
2600 .ndo_set_features = virtnet_set_features,
2601 };
2602
2603 static void virtnet_config_changed_work(struct work_struct *work)
2604 {
2605 struct virtnet_info *vi =
2606 container_of(work, struct virtnet_info, config_work);
2607 u16 v;
2608
2609 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
2610 struct virtio_net_config, status, &v) < 0)
2611 return;
2612
2613 if (v & VIRTIO_NET_S_ANNOUNCE) {
2614 netdev_notify_peers(vi->dev);
2615 virtnet_ack_link_announce(vi);
2616 }
2617
2618
2619 v &= VIRTIO_NET_S_LINK_UP;
2620
2621 if (vi->status == v)
2622 return;
2623
2624 vi->status = v;
2625
2626 if (vi->status & VIRTIO_NET_S_LINK_UP) {
2627 virtnet_update_settings(vi);
2628 netif_carrier_on(vi->dev);
2629 netif_tx_wake_all_queues(vi->dev);
2630 } else {
2631 netif_carrier_off(vi->dev);
2632 netif_tx_stop_all_queues(vi->dev);
2633 }
2634 }
2635
2636 static void virtnet_config_changed(struct virtio_device *vdev)
2637 {
2638 struct virtnet_info *vi = vdev->priv;
2639
2640 schedule_work(&vi->config_work);
2641 }
2642
2643 static void virtnet_free_queues(struct virtnet_info *vi)
2644 {
2645 int i;
2646
2647 for (i = 0; i < vi->max_queue_pairs; i++) {
2648 napi_hash_del(&vi->rq[i].napi);
2649 netif_napi_del(&vi->rq[i].napi);
2650 netif_napi_del(&vi->sq[i].napi);
2651 }
2652
2653
2654
2655
2656 synchronize_net();
2657
2658 kfree(vi->rq);
2659 kfree(vi->sq);
2660 kfree(vi->ctrl);
2661 }
2662
2663 static void _free_receive_bufs(struct virtnet_info *vi)
2664 {
2665 struct bpf_prog *old_prog;
2666 int i;
2667
2668 for (i = 0; i < vi->max_queue_pairs; i++) {
2669 while (vi->rq[i].pages)
2670 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
2671
2672 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2673 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
2674 if (old_prog)
2675 bpf_prog_put(old_prog);
2676 }
2677 }
2678
2679 static void free_receive_bufs(struct virtnet_info *vi)
2680 {
2681 rtnl_lock();
2682 _free_receive_bufs(vi);
2683 rtnl_unlock();
2684 }
2685
2686 static void free_receive_page_frags(struct virtnet_info *vi)
2687 {
2688 int i;
2689 for (i = 0; i < vi->max_queue_pairs; i++)
2690 if (vi->rq[i].alloc_frag.page)
2691 put_page(vi->rq[i].alloc_frag.page);
2692 }
2693
2694 static void free_unused_bufs(struct virtnet_info *vi)
2695 {
2696 void *buf;
2697 int i;
2698
2699 for (i = 0; i < vi->max_queue_pairs; i++) {
2700 struct virtqueue *vq = vi->sq[i].vq;
2701 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2702 if (!is_xdp_frame(buf))
2703 dev_kfree_skb(buf);
2704 else
2705 xdp_return_frame(ptr_to_xdp(buf));
2706 }
2707 }
2708
2709 for (i = 0; i < vi->max_queue_pairs; i++) {
2710 struct virtqueue *vq = vi->rq[i].vq;
2711
2712 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2713 if (vi->mergeable_rx_bufs) {
2714 put_page(virt_to_head_page(buf));
2715 } else if (vi->big_packets) {
2716 give_pages(&vi->rq[i], buf);
2717 } else {
2718 put_page(virt_to_head_page(buf));
2719 }
2720 }
2721 }
2722 }
2723
2724 static void virtnet_del_vqs(struct virtnet_info *vi)
2725 {
2726 struct virtio_device *vdev = vi->vdev;
2727
2728 virtnet_clean_affinity(vi);
2729
2730 vdev->config->del_vqs(vdev);
2731
2732 virtnet_free_queues(vi);
2733 }
2734
2735
2736
2737
2738
2739 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
2740 {
2741 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2742 unsigned int rq_size = virtqueue_get_vring_size(vq);
2743 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
2744 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
2745 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
2746
2747 return max(max(min_buf_len, hdr_len) - hdr_len,
2748 (unsigned int)GOOD_PACKET_LEN);
2749 }
2750
2751 static int virtnet_find_vqs(struct virtnet_info *vi)
2752 {
2753 vq_callback_t **callbacks;
2754 struct virtqueue **vqs;
2755 int ret = -ENOMEM;
2756 int i, total_vqs;
2757 const char **names;
2758 bool *ctx;
2759
2760
2761
2762
2763
2764 total_vqs = vi->max_queue_pairs * 2 +
2765 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
2766
2767
2768 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
2769 if (!vqs)
2770 goto err_vq;
2771 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
2772 if (!callbacks)
2773 goto err_callback;
2774 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
2775 if (!names)
2776 goto err_names;
2777 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2778 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
2779 if (!ctx)
2780 goto err_ctx;
2781 } else {
2782 ctx = NULL;
2783 }
2784
2785
2786 if (vi->has_cvq) {
2787 callbacks[total_vqs - 1] = NULL;
2788 names[total_vqs - 1] = "control";
2789 }
2790
2791
2792 for (i = 0; i < vi->max_queue_pairs; i++) {
2793 callbacks[rxq2vq(i)] = skb_recv_done;
2794 callbacks[txq2vq(i)] = skb_xmit_done;
2795 sprintf(vi->rq[i].name, "input.%d", i);
2796 sprintf(vi->sq[i].name, "output.%d", i);
2797 names[rxq2vq(i)] = vi->rq[i].name;
2798 names[txq2vq(i)] = vi->sq[i].name;
2799 if (ctx)
2800 ctx[rxq2vq(i)] = true;
2801 }
2802
2803 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
2804 names, ctx, NULL);
2805 if (ret)
2806 goto err_find;
2807
2808 if (vi->has_cvq) {
2809 vi->cvq = vqs[total_vqs - 1];
2810 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
2811 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2812 }
2813
2814 for (i = 0; i < vi->max_queue_pairs; i++) {
2815 vi->rq[i].vq = vqs[rxq2vq(i)];
2816 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
2817 vi->sq[i].vq = vqs[txq2vq(i)];
2818 }
2819
2820
2821
2822
2823 err_find:
2824 kfree(ctx);
2825 err_ctx:
2826 kfree(names);
2827 err_names:
2828 kfree(callbacks);
2829 err_callback:
2830 kfree(vqs);
2831 err_vq:
2832 return ret;
2833 }
2834
2835 static int virtnet_alloc_queues(struct virtnet_info *vi)
2836 {
2837 int i;
2838
2839 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
2840 if (!vi->ctrl)
2841 goto err_ctrl;
2842 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
2843 if (!vi->sq)
2844 goto err_sq;
2845 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
2846 if (!vi->rq)
2847 goto err_rq;
2848
2849 INIT_DELAYED_WORK(&vi->refill, refill_work);
2850 for (i = 0; i < vi->max_queue_pairs; i++) {
2851 vi->rq[i].pages = NULL;
2852 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2853 napi_weight);
2854 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
2855 napi_tx ? napi_weight : 0);
2856
2857 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2858 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2859 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2860
2861 u64_stats_init(&vi->rq[i].stats.syncp);
2862 u64_stats_init(&vi->sq[i].stats.syncp);
2863 }
2864
2865 return 0;
2866
2867 err_rq:
2868 kfree(vi->sq);
2869 err_sq:
2870 kfree(vi->ctrl);
2871 err_ctrl:
2872 return -ENOMEM;
2873 }
2874
2875 static int init_vqs(struct virtnet_info *vi)
2876 {
2877 int ret;
2878
2879
2880 ret = virtnet_alloc_queues(vi);
2881 if (ret)
2882 goto err;
2883
2884 ret = virtnet_find_vqs(vi);
2885 if (ret)
2886 goto err_free;
2887
2888 get_online_cpus();
2889 virtnet_set_affinity(vi);
2890 put_online_cpus();
2891
2892 return 0;
2893
2894 err_free:
2895 virtnet_free_queues(vi);
2896 err:
2897 return ret;
2898 }
2899
2900 #ifdef CONFIG_SYSFS
2901 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2902 char *buf)
2903 {
2904 struct virtnet_info *vi = netdev_priv(queue->dev);
2905 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2906 unsigned int headroom = virtnet_get_headroom(vi);
2907 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2908 struct ewma_pkt_len *avg;
2909
2910 BUG_ON(queue_index >= vi->max_queue_pairs);
2911 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2912 return sprintf(buf, "%u\n",
2913 get_mergeable_buf_len(&vi->rq[queue_index], avg,
2914 SKB_DATA_ALIGN(headroom + tailroom)));
2915 }
2916
2917 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2918 __ATTR_RO(mergeable_rx_buffer_size);
2919
2920 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2921 &mergeable_rx_buffer_size_attribute.attr,
2922 NULL
2923 };
2924
2925 static const struct attribute_group virtio_net_mrg_rx_group = {
2926 .name = "virtio_net",
2927 .attrs = virtio_net_mrg_rx_attrs
2928 };
2929 #endif
2930
2931 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2932 unsigned int fbit,
2933 const char *fname, const char *dname)
2934 {
2935 if (!virtio_has_feature(vdev, fbit))
2936 return false;
2937
2938 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2939 fname, dname);
2940
2941 return true;
2942 }
2943
2944 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2945 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2946
2947 static bool virtnet_validate_features(struct virtio_device *vdev)
2948 {
2949 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2950 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2951 "VIRTIO_NET_F_CTRL_VQ") ||
2952 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2953 "VIRTIO_NET_F_CTRL_VQ") ||
2954 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2955 "VIRTIO_NET_F_CTRL_VQ") ||
2956 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2957 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2958 "VIRTIO_NET_F_CTRL_VQ"))) {
2959 return false;
2960 }
2961
2962 return true;
2963 }
2964
2965 #define MIN_MTU ETH_MIN_MTU
2966 #define MAX_MTU ETH_MAX_MTU
2967
2968 static int virtnet_validate(struct virtio_device *vdev)
2969 {
2970 if (!vdev->config->get) {
2971 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2972 __func__);
2973 return -EINVAL;
2974 }
2975
2976 if (!virtnet_validate_features(vdev))
2977 return -EINVAL;
2978
2979 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2980 int mtu = virtio_cread16(vdev,
2981 offsetof(struct virtio_net_config,
2982 mtu));
2983 if (mtu < MIN_MTU)
2984 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2985 }
2986
2987 return 0;
2988 }
2989
2990 static int virtnet_probe(struct virtio_device *vdev)
2991 {
2992 int i, err = -ENOMEM;
2993 struct net_device *dev;
2994 struct virtnet_info *vi;
2995 u16 max_queue_pairs;
2996 int mtu;
2997
2998
2999 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
3000 struct virtio_net_config,
3001 max_virtqueue_pairs, &max_queue_pairs);
3002
3003
3004 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
3005 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
3006 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3007 max_queue_pairs = 1;
3008
3009
3010 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
3011 if (!dev)
3012 return -ENOMEM;
3013
3014
3015 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
3016 dev->netdev_ops = &virtnet_netdev;
3017 dev->features = NETIF_F_HIGHDMA;
3018
3019 dev->ethtool_ops = &virtnet_ethtool_ops;
3020 SET_NETDEV_DEV(dev, &vdev->dev);
3021
3022
3023 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
3024
3025 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3026 if (csum)
3027 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3028
3029 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
3030 dev->hw_features |= NETIF_F_TSO
3031 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
3032 }
3033
3034 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
3035 dev->hw_features |= NETIF_F_TSO;
3036 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
3037 dev->hw_features |= NETIF_F_TSO6;
3038 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
3039 dev->hw_features |= NETIF_F_TSO_ECN;
3040
3041 dev->features |= NETIF_F_GSO_ROBUST;
3042
3043 if (gso)
3044 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
3045
3046 }
3047 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
3048 dev->features |= NETIF_F_RXCSUM;
3049 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3050 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
3051 dev->features |= NETIF_F_LRO;
3052 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
3053 dev->hw_features |= NETIF_F_LRO;
3054
3055 dev->vlan_features = dev->features;
3056
3057
3058 dev->min_mtu = MIN_MTU;
3059 dev->max_mtu = MAX_MTU;
3060
3061
3062 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
3063 virtio_cread_bytes(vdev,
3064 offsetof(struct virtio_net_config, mac),
3065 dev->dev_addr, dev->addr_len);
3066 else
3067 eth_hw_addr_random(dev);
3068
3069
3070 vi = netdev_priv(dev);
3071 vi->dev = dev;
3072 vi->vdev = vdev;
3073 vdev->priv = vi;
3074
3075 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
3076
3077
3078 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3079 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
3080 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
3081 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
3082 vi->big_packets = true;
3083
3084 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
3085 vi->mergeable_rx_bufs = true;
3086
3087 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
3088 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3089 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
3090 else
3091 vi->hdr_len = sizeof(struct virtio_net_hdr);
3092
3093 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
3094 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3095 vi->any_header_sg = true;
3096
3097 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3098 vi->has_cvq = true;
3099
3100 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3101 mtu = virtio_cread16(vdev,
3102 offsetof(struct virtio_net_config,
3103 mtu));
3104 if (mtu < dev->min_mtu) {
3105
3106
3107
3108 dev_err(&vdev->dev,
3109 "device MTU appears to have changed it is now %d < %d",
3110 mtu, dev->min_mtu);
3111 goto free;
3112 }
3113
3114 dev->mtu = mtu;
3115 dev->max_mtu = mtu;
3116
3117
3118 if (dev->mtu > ETH_DATA_LEN)
3119 vi->big_packets = true;
3120 }
3121
3122 if (vi->any_header_sg)
3123 dev->needed_headroom = vi->hdr_len;
3124
3125
3126 if (num_online_cpus() >= max_queue_pairs)
3127 vi->curr_queue_pairs = max_queue_pairs;
3128 else
3129 vi->curr_queue_pairs = num_online_cpus();
3130 vi->max_queue_pairs = max_queue_pairs;
3131
3132
3133 err = init_vqs(vi);
3134 if (err)
3135 goto free;
3136
3137 #ifdef CONFIG_SYSFS
3138 if (vi->mergeable_rx_bufs)
3139 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
3140 #endif
3141 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
3142 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
3143
3144 virtnet_init_settings(dev);
3145
3146 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3147 vi->failover = net_failover_create(vi->dev);
3148 if (IS_ERR(vi->failover)) {
3149 err = PTR_ERR(vi->failover);
3150 goto free_vqs;
3151 }
3152 }
3153
3154 err = register_netdev(dev);
3155 if (err) {
3156 pr_debug("virtio_net: registering device failed\n");
3157 goto free_failover;
3158 }
3159
3160 virtio_device_ready(vdev);
3161
3162 err = virtnet_cpu_notif_add(vi);
3163 if (err) {
3164 pr_debug("virtio_net: registering cpu notifier failed\n");
3165 goto free_unregister_netdev;
3166 }
3167
3168 virtnet_set_queues(vi, vi->curr_queue_pairs);
3169
3170
3171
3172 netif_carrier_off(dev);
3173 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3174 schedule_work(&vi->config_work);
3175 } else {
3176 vi->status = VIRTIO_NET_S_LINK_UP;
3177 virtnet_update_settings(vi);
3178 netif_carrier_on(dev);
3179 }
3180
3181 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
3182 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
3183 set_bit(guest_offloads[i], &vi->guest_offloads);
3184 vi->guest_offloads_capable = vi->guest_offloads;
3185
3186 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
3187 dev->name, max_queue_pairs);
3188
3189 return 0;
3190
3191 free_unregister_netdev:
3192 vi->vdev->config->reset(vdev);
3193
3194 unregister_netdev(dev);
3195 free_failover:
3196 net_failover_destroy(vi->failover);
3197 free_vqs:
3198 cancel_delayed_work_sync(&vi->refill);
3199 free_receive_page_frags(vi);
3200 virtnet_del_vqs(vi);
3201 free:
3202 free_netdev(dev);
3203 return err;
3204 }
3205
3206 static void remove_vq_common(struct virtnet_info *vi)
3207 {
3208 vi->vdev->config->reset(vi->vdev);
3209
3210
3211 free_unused_bufs(vi);
3212
3213 free_receive_bufs(vi);
3214
3215 free_receive_page_frags(vi);
3216
3217 virtnet_del_vqs(vi);
3218 }
3219
3220 static void virtnet_remove(struct virtio_device *vdev)
3221 {
3222 struct virtnet_info *vi = vdev->priv;
3223
3224 virtnet_cpu_notif_remove(vi);
3225
3226
3227 flush_work(&vi->config_work);
3228
3229 unregister_netdev(vi->dev);
3230
3231 net_failover_destroy(vi->failover);
3232
3233 remove_vq_common(vi);
3234
3235 free_netdev(vi->dev);
3236 }
3237
3238 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
3239 {
3240 struct virtnet_info *vi = vdev->priv;
3241
3242 virtnet_cpu_notif_remove(vi);
3243 virtnet_freeze_down(vdev);
3244 remove_vq_common(vi);
3245
3246 return 0;
3247 }
3248
3249 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
3250 {
3251 struct virtnet_info *vi = vdev->priv;
3252 int err;
3253
3254 err = virtnet_restore_up(vdev);
3255 if (err)
3256 return err;
3257 virtnet_set_queues(vi, vi->curr_queue_pairs);
3258
3259 err = virtnet_cpu_notif_add(vi);
3260 if (err)
3261 return err;
3262
3263 return 0;
3264 }
3265
3266 static struct virtio_device_id id_table[] = {
3267 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
3268 { 0 },
3269 };
3270
3271 #define VIRTNET_FEATURES \
3272 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
3273 VIRTIO_NET_F_MAC, \
3274 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
3275 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
3276 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
3277 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
3278 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
3279 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
3280 VIRTIO_NET_F_CTRL_MAC_ADDR, \
3281 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
3282 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY
3283
3284 static unsigned int features[] = {
3285 VIRTNET_FEATURES,
3286 };
3287
3288 static unsigned int features_legacy[] = {
3289 VIRTNET_FEATURES,
3290 VIRTIO_NET_F_GSO,
3291 VIRTIO_F_ANY_LAYOUT,
3292 };
3293
3294 static struct virtio_driver virtio_net_driver = {
3295 .feature_table = features,
3296 .feature_table_size = ARRAY_SIZE(features),
3297 .feature_table_legacy = features_legacy,
3298 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
3299 .driver.name = KBUILD_MODNAME,
3300 .driver.owner = THIS_MODULE,
3301 .id_table = id_table,
3302 .validate = virtnet_validate,
3303 .probe = virtnet_probe,
3304 .remove = virtnet_remove,
3305 .config_changed = virtnet_config_changed,
3306 #ifdef CONFIG_PM_SLEEP
3307 .freeze = virtnet_freeze,
3308 .restore = virtnet_restore,
3309 #endif
3310 };
3311
3312 static __init int virtio_net_driver_init(void)
3313 {
3314 int ret;
3315
3316 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
3317 virtnet_cpu_online,
3318 virtnet_cpu_down_prep);
3319 if (ret < 0)
3320 goto out;
3321 virtionet_online = ret;
3322 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
3323 NULL, virtnet_cpu_dead);
3324 if (ret)
3325 goto err_dead;
3326
3327 ret = register_virtio_driver(&virtio_net_driver);
3328 if (ret)
3329 goto err_virtio;
3330 return 0;
3331 err_virtio:
3332 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3333 err_dead:
3334 cpuhp_remove_multi_state(virtionet_online);
3335 out:
3336 return ret;
3337 }
3338 module_init(virtio_net_driver_init);
3339
3340 static __exit void virtio_net_driver_exit(void)
3341 {
3342 unregister_virtio_driver(&virtio_net_driver);
3343 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3344 cpuhp_remove_multi_state(virtionet_online);
3345 }
3346 module_exit(virtio_net_driver_exit);
3347
3348 MODULE_DEVICE_TABLE(virtio, id_table);
3349 MODULE_DESCRIPTION("Virtio network driver");
3350 MODULE_LICENSE("GPL");