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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
26static int napi_weight = NAPI_POLL_WEIGHT;
27module_param(napi_weight, int, 0444);
28
29static bool csum = true, gso = true, napi_tx = true;
30module_param(csum, bool, 0444);
31module_param(gso, bool, 0444);
32module_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
54DECLARE_EWMA(pkt_len, 0, 64)
55
56#define VIRTNET_DRIVER_VERSION "1.0.0"
57
58static 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#define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
67 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
68 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
69 (1ULL << VIRTIO_NET_F_GUEST_UFO))
70
71struct virtnet_stat_desc {
72 char desc[ETH_GSTRING_LEN];
73 size_t offset;
74};
75
76struct virtnet_sq_stats {
77 struct u64_stats_sync syncp;
78 u64 packets;
79 u64 bytes;
80 u64 xdp_tx;
81 u64 xdp_tx_drops;
82 u64 kicks;
83};
84
85struct virtnet_rq_stats {
86 struct u64_stats_sync syncp;
87 u64 packets;
88 u64 bytes;
89 u64 drops;
90 u64 xdp_packets;
91 u64 xdp_tx;
92 u64 xdp_redirects;
93 u64 xdp_drops;
94 u64 kicks;
95};
96
97#define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
98#define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
99
100static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
101 { "packets", VIRTNET_SQ_STAT(packets) },
102 { "bytes", VIRTNET_SQ_STAT(bytes) },
103 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
104 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
105 { "kicks", VIRTNET_SQ_STAT(kicks) },
106};
107
108static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
109 { "packets", VIRTNET_RQ_STAT(packets) },
110 { "bytes", VIRTNET_RQ_STAT(bytes) },
111 { "drops", VIRTNET_RQ_STAT(drops) },
112 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
113 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
114 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
115 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
116 { "kicks", VIRTNET_RQ_STAT(kicks) },
117};
118
119#define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
120#define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
121
122
123struct send_queue {
124
125 struct virtqueue *vq;
126
127
128 struct scatterlist sg[MAX_SKB_FRAGS + 2];
129
130
131 char name[40];
132
133 struct virtnet_sq_stats stats;
134
135 struct napi_struct napi;
136};
137
138
139struct receive_queue {
140
141 struct virtqueue *vq;
142
143 struct napi_struct napi;
144
145 struct bpf_prog __rcu *xdp_prog;
146
147 struct virtnet_rq_stats stats;
148
149
150 struct page *pages;
151
152
153 struct ewma_pkt_len mrg_avg_pkt_len;
154
155
156 struct page_frag alloc_frag;
157
158
159 struct scatterlist sg[MAX_SKB_FRAGS + 2];
160
161
162 unsigned int min_buf_len;
163
164
165 char name[40];
166
167 struct xdp_rxq_info xdp_rxq;
168};
169
170
171struct control_buf {
172 struct virtio_net_ctrl_hdr hdr;
173 virtio_net_ctrl_ack status;
174 struct virtio_net_ctrl_mq mq;
175 u8 promisc;
176 u8 allmulti;
177 __virtio16 vid;
178 __virtio64 offloads;
179};
180
181struct virtnet_info {
182 struct virtio_device *vdev;
183 struct virtqueue *cvq;
184 struct net_device *dev;
185 struct send_queue *sq;
186 struct receive_queue *rq;
187 unsigned int status;
188
189
190 u16 max_queue_pairs;
191
192
193 u16 curr_queue_pairs;
194
195
196 u16 xdp_queue_pairs;
197
198
199 bool xdp_enabled;
200
201
202 bool big_packets;
203
204
205 bool mergeable_rx_bufs;
206
207
208 bool has_cvq;
209
210
211 bool any_header_sg;
212
213
214 u8 hdr_len;
215
216
217 struct delayed_work refill;
218
219
220 struct work_struct config_work;
221
222
223 bool affinity_hint_set;
224
225
226 struct hlist_node node;
227 struct hlist_node node_dead;
228
229 struct control_buf *ctrl;
230
231
232 u8 duplex;
233 u32 speed;
234
235 unsigned long guest_offloads;
236 unsigned long guest_offloads_capable;
237
238
239 struct failover *failover;
240};
241
242struct padded_vnet_hdr {
243 struct virtio_net_hdr_mrg_rxbuf hdr;
244
245
246
247
248
249 char padding[4];
250};
251
252static bool is_xdp_frame(void *ptr)
253{
254 return (unsigned long)ptr & VIRTIO_XDP_FLAG;
255}
256
257static void *xdp_to_ptr(struct xdp_frame *ptr)
258{
259 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
260}
261
262static struct xdp_frame *ptr_to_xdp(void *ptr)
263{
264 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
265}
266
267
268
269
270static int vq2txq(struct virtqueue *vq)
271{
272 return (vq->index - 1) / 2;
273}
274
275static int txq2vq(int txq)
276{
277 return txq * 2 + 1;
278}
279
280static int vq2rxq(struct virtqueue *vq)
281{
282 return vq->index / 2;
283}
284
285static int rxq2vq(int rxq)
286{
287 return rxq * 2;
288}
289
290static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
291{
292 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
293}
294
295
296
297
298
299static void give_pages(struct receive_queue *rq, struct page *page)
300{
301 struct page *end;
302
303
304 for (end = page; end->private; end = (struct page *)end->private);
305 end->private = (unsigned long)rq->pages;
306 rq->pages = page;
307}
308
309static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
310{
311 struct page *p = rq->pages;
312
313 if (p) {
314 rq->pages = (struct page *)p->private;
315
316 p->private = 0;
317 } else
318 p = alloc_page(gfp_mask);
319 return p;
320}
321
322static void virtqueue_napi_schedule(struct napi_struct *napi,
323 struct virtqueue *vq)
324{
325 if (napi_schedule_prep(napi)) {
326 virtqueue_disable_cb(vq);
327 __napi_schedule(napi);
328 }
329}
330
331static void virtqueue_napi_complete(struct napi_struct *napi,
332 struct virtqueue *vq, int processed)
333{
334 int opaque;
335
336 opaque = virtqueue_enable_cb_prepare(vq);
337 if (napi_complete_done(napi, processed)) {
338 if (unlikely(virtqueue_poll(vq, opaque)))
339 virtqueue_napi_schedule(napi, vq);
340 } else {
341 virtqueue_disable_cb(vq);
342 }
343}
344
345static void skb_xmit_done(struct virtqueue *vq)
346{
347 struct virtnet_info *vi = vq->vdev->priv;
348 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
349
350
351 virtqueue_disable_cb(vq);
352
353 if (napi->weight)
354 virtqueue_napi_schedule(napi, vq);
355 else
356
357 netif_wake_subqueue(vi->dev, vq2txq(vq));
358}
359
360#define MRG_CTX_HEADER_SHIFT 22
361static void *mergeable_len_to_ctx(unsigned int truesize,
362 unsigned int headroom)
363{
364 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
365}
366
367static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
368{
369 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
370}
371
372static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
373{
374 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
375}
376
377
378static struct sk_buff *page_to_skb(struct virtnet_info *vi,
379 struct receive_queue *rq,
380 struct page *page, unsigned int offset,
381 unsigned int len, unsigned int truesize,
382 bool hdr_valid, unsigned int metasize,
383 unsigned int headroom)
384{
385 struct sk_buff *skb;
386 struct virtio_net_hdr_mrg_rxbuf *hdr;
387 unsigned int copy, hdr_len, hdr_padded_len;
388 struct page *page_to_free = NULL;
389 int tailroom, shinfo_size;
390 char *p, *hdr_p, *buf;
391
392 p = page_address(page) + offset;
393 hdr_p = p;
394
395 hdr_len = vi->hdr_len;
396 if (vi->mergeable_rx_bufs)
397 hdr_padded_len = sizeof(*hdr);
398 else
399 hdr_padded_len = sizeof(struct padded_vnet_hdr);
400
401
402
403
404
405
406
407
408 truesize = headroom ? PAGE_SIZE : truesize;
409 tailroom = truesize - len - headroom - (hdr_padded_len - hdr_len);
410 buf = p - headroom;
411
412 len -= hdr_len;
413 offset += hdr_padded_len;
414 p += hdr_padded_len;
415
416 shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
417
418
419 if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) {
420 skb = build_skb(buf, truesize);
421 if (unlikely(!skb))
422 return NULL;
423
424 skb_reserve(skb, p - buf);
425 skb_put(skb, len);
426
427 page = (struct page *)page->private;
428 if (page)
429 give_pages(rq, page);
430 goto ok;
431 }
432
433
434 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
435 if (unlikely(!skb))
436 return NULL;
437
438
439
440
441 if (len <= skb_tailroom(skb))
442 copy = len;
443 else
444 copy = ETH_HLEN + metasize;
445 skb_put_data(skb, p, copy);
446
447 len -= copy;
448 offset += copy;
449
450 if (vi->mergeable_rx_bufs) {
451 if (len)
452 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
453 else
454 page_to_free = page;
455 goto ok;
456 }
457
458
459
460
461
462
463
464 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
465 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
466 dev_kfree_skb(skb);
467 return NULL;
468 }
469 BUG_ON(offset >= PAGE_SIZE);
470 while (len) {
471 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
472 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
473 frag_size, truesize);
474 len -= frag_size;
475 page = (struct page *)page->private;
476 offset = 0;
477 }
478
479 if (page)
480 give_pages(rq, page);
481
482ok:
483
484 if (hdr_valid) {
485 hdr = skb_vnet_hdr(skb);
486 memcpy(hdr, hdr_p, hdr_len);
487 }
488 if (page_to_free)
489 put_page(page_to_free);
490
491 if (metasize) {
492 __skb_pull(skb, metasize);
493 skb_metadata_set(skb, metasize);
494 }
495
496 return skb;
497}
498
499static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
500 struct send_queue *sq,
501 struct xdp_frame *xdpf)
502{
503 struct virtio_net_hdr_mrg_rxbuf *hdr;
504 int err;
505
506 if (unlikely(xdpf->headroom < vi->hdr_len))
507 return -EOVERFLOW;
508
509
510 xdpf->data -= vi->hdr_len;
511
512 hdr = xdpf->data;
513 memset(hdr, 0, vi->hdr_len);
514 xdpf->len += vi->hdr_len;
515
516 sg_init_one(sq->sg, xdpf->data, xdpf->len);
517
518 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf),
519 GFP_ATOMIC);
520 if (unlikely(err))
521 return -ENOSPC;
522
523 return 0;
524}
525
526
527
528
529
530
531
532
533
534#define virtnet_xdp_get_sq(vi) ({ \
535 int cpu = smp_processor_id(); \
536 struct netdev_queue *txq; \
537 typeof(vi) v = (vi); \
538 unsigned int qp; \
539 \
540 if (v->curr_queue_pairs > nr_cpu_ids) { \
541 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \
542 qp += cpu; \
543 txq = netdev_get_tx_queue(v->dev, qp); \
544 __netif_tx_acquire(txq); \
545 } else { \
546 qp = cpu % v->curr_queue_pairs; \
547 txq = netdev_get_tx_queue(v->dev, qp); \
548 __netif_tx_lock(txq, cpu); \
549 } \
550 v->sq + qp; \
551})
552
553#define virtnet_xdp_put_sq(vi, q) { \
554 struct netdev_queue *txq; \
555 typeof(vi) v = (vi); \
556 \
557 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \
558 if (v->curr_queue_pairs > nr_cpu_ids) \
559 __netif_tx_release(txq); \
560 else \
561 __netif_tx_unlock(txq); \
562}
563
564static int virtnet_xdp_xmit(struct net_device *dev,
565 int n, struct xdp_frame **frames, u32 flags)
566{
567 struct virtnet_info *vi = netdev_priv(dev);
568 struct receive_queue *rq = vi->rq;
569 struct bpf_prog *xdp_prog;
570 struct send_queue *sq;
571 unsigned int len;
572 int packets = 0;
573 int bytes = 0;
574 int nxmit = 0;
575 int kicks = 0;
576 void *ptr;
577 int ret;
578 int i;
579
580
581
582
583 xdp_prog = rcu_access_pointer(rq->xdp_prog);
584 if (!xdp_prog)
585 return -ENXIO;
586
587 sq = virtnet_xdp_get_sq(vi);
588
589 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
590 ret = -EINVAL;
591 goto out;
592 }
593
594
595 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
596 if (likely(is_xdp_frame(ptr))) {
597 struct xdp_frame *frame = ptr_to_xdp(ptr);
598
599 bytes += frame->len;
600 xdp_return_frame(frame);
601 } else {
602 struct sk_buff *skb = ptr;
603
604 bytes += skb->len;
605 napi_consume_skb(skb, false);
606 }
607 packets++;
608 }
609
610 for (i = 0; i < n; i++) {
611 struct xdp_frame *xdpf = frames[i];
612
613 if (__virtnet_xdp_xmit_one(vi, sq, xdpf))
614 break;
615 nxmit++;
616 }
617 ret = nxmit;
618
619 if (flags & XDP_XMIT_FLUSH) {
620 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
621 kicks = 1;
622 }
623out:
624 u64_stats_update_begin(&sq->stats.syncp);
625 sq->stats.bytes += bytes;
626 sq->stats.packets += packets;
627 sq->stats.xdp_tx += n;
628 sq->stats.xdp_tx_drops += n - nxmit;
629 sq->stats.kicks += kicks;
630 u64_stats_update_end(&sq->stats.syncp);
631
632 virtnet_xdp_put_sq(vi, sq);
633 return ret;
634}
635
636static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
637{
638 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0;
639}
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655static struct page *xdp_linearize_page(struct receive_queue *rq,
656 u16 *num_buf,
657 struct page *p,
658 int offset,
659 int page_off,
660 unsigned int *len)
661{
662 struct page *page = alloc_page(GFP_ATOMIC);
663
664 if (!page)
665 return NULL;
666
667 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
668 page_off += *len;
669
670 while (--*num_buf) {
671 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
672 unsigned int buflen;
673 void *buf;
674 int off;
675
676 buf = virtqueue_get_buf(rq->vq, &buflen);
677 if (unlikely(!buf))
678 goto err_buf;
679
680 p = virt_to_head_page(buf);
681 off = buf - page_address(p);
682
683
684
685
686 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
687 put_page(p);
688 goto err_buf;
689 }
690
691 memcpy(page_address(page) + page_off,
692 page_address(p) + off, buflen);
693 page_off += buflen;
694 put_page(p);
695 }
696
697
698 *len = page_off - VIRTIO_XDP_HEADROOM;
699 return page;
700err_buf:
701 __free_pages(page, 0);
702 return NULL;
703}
704
705static struct sk_buff *receive_small(struct net_device *dev,
706 struct virtnet_info *vi,
707 struct receive_queue *rq,
708 void *buf, void *ctx,
709 unsigned int len,
710 unsigned int *xdp_xmit,
711 struct virtnet_rq_stats *stats)
712{
713 struct sk_buff *skb;
714 struct bpf_prog *xdp_prog;
715 unsigned int xdp_headroom = (unsigned long)ctx;
716 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
717 unsigned int headroom = vi->hdr_len + header_offset;
718 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
719 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
720 struct page *page = virt_to_head_page(buf);
721 unsigned int delta = 0;
722 struct page *xdp_page;
723 int err;
724 unsigned int metasize = 0;
725
726 len -= vi->hdr_len;
727 stats->bytes += len;
728
729 if (unlikely(len > GOOD_PACKET_LEN)) {
730 pr_debug("%s: rx error: len %u exceeds max size %d\n",
731 dev->name, len, GOOD_PACKET_LEN);
732 dev->stats.rx_length_errors++;
733 goto err_len;
734 }
735 rcu_read_lock();
736 xdp_prog = rcu_dereference(rq->xdp_prog);
737 if (xdp_prog) {
738 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
739 struct xdp_frame *xdpf;
740 struct xdp_buff xdp;
741 void *orig_data;
742 u32 act;
743
744 if (unlikely(hdr->hdr.gso_type))
745 goto err_xdp;
746
747 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
748 int offset = buf - page_address(page) + header_offset;
749 unsigned int tlen = len + vi->hdr_len;
750 u16 num_buf = 1;
751
752 xdp_headroom = virtnet_get_headroom(vi);
753 header_offset = VIRTNET_RX_PAD + xdp_headroom;
754 headroom = vi->hdr_len + header_offset;
755 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
756 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
757 xdp_page = xdp_linearize_page(rq, &num_buf, page,
758 offset, header_offset,
759 &tlen);
760 if (!xdp_page)
761 goto err_xdp;
762
763 buf = page_address(xdp_page);
764 put_page(page);
765 page = xdp_page;
766 }
767
768 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq);
769 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len,
770 xdp_headroom, len, true);
771 orig_data = xdp.data;
772 act = bpf_prog_run_xdp(xdp_prog, &xdp);
773 stats->xdp_packets++;
774
775 switch (act) {
776 case XDP_PASS:
777
778 delta = orig_data - xdp.data;
779 len = xdp.data_end - xdp.data;
780 metasize = xdp.data - xdp.data_meta;
781 break;
782 case XDP_TX:
783 stats->xdp_tx++;
784 xdpf = xdp_convert_buff_to_frame(&xdp);
785 if (unlikely(!xdpf))
786 goto err_xdp;
787 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
788 if (unlikely(!err)) {
789 xdp_return_frame_rx_napi(xdpf);
790 } else if (unlikely(err < 0)) {
791 trace_xdp_exception(vi->dev, xdp_prog, act);
792 goto err_xdp;
793 }
794 *xdp_xmit |= VIRTIO_XDP_TX;
795 rcu_read_unlock();
796 goto xdp_xmit;
797 case XDP_REDIRECT:
798 stats->xdp_redirects++;
799 err = xdp_do_redirect(dev, &xdp, xdp_prog);
800 if (err)
801 goto err_xdp;
802 *xdp_xmit |= VIRTIO_XDP_REDIR;
803 rcu_read_unlock();
804 goto xdp_xmit;
805 default:
806 bpf_warn_invalid_xdp_action(act);
807 fallthrough;
808 case XDP_ABORTED:
809 trace_xdp_exception(vi->dev, xdp_prog, act);
810 goto err_xdp;
811 case XDP_DROP:
812 goto err_xdp;
813 }
814 }
815 rcu_read_unlock();
816
817 skb = build_skb(buf, buflen);
818 if (!skb) {
819 put_page(page);
820 goto err;
821 }
822 skb_reserve(skb, headroom - delta);
823 skb_put(skb, len);
824 if (!xdp_prog) {
825 buf += header_offset;
826 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
827 }
828
829 if (metasize)
830 skb_metadata_set(skb, metasize);
831
832err:
833 return skb;
834
835err_xdp:
836 rcu_read_unlock();
837 stats->xdp_drops++;
838err_len:
839 stats->drops++;
840 put_page(page);
841xdp_xmit:
842 return NULL;
843}
844
845static struct sk_buff *receive_big(struct net_device *dev,
846 struct virtnet_info *vi,
847 struct receive_queue *rq,
848 void *buf,
849 unsigned int len,
850 struct virtnet_rq_stats *stats)
851{
852 struct page *page = buf;
853 struct sk_buff *skb =
854 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0, 0);
855
856 stats->bytes += len - vi->hdr_len;
857 if (unlikely(!skb))
858 goto err;
859
860 return skb;
861
862err:
863 stats->drops++;
864 give_pages(rq, page);
865 return NULL;
866}
867
868static struct sk_buff *receive_mergeable(struct net_device *dev,
869 struct virtnet_info *vi,
870 struct receive_queue *rq,
871 void *buf,
872 void *ctx,
873 unsigned int len,
874 unsigned int *xdp_xmit,
875 struct virtnet_rq_stats *stats)
876{
877 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
878 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
879 struct page *page = virt_to_head_page(buf);
880 int offset = buf - page_address(page);
881 struct sk_buff *head_skb, *curr_skb;
882 struct bpf_prog *xdp_prog;
883 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
884 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
885 unsigned int metasize = 0;
886 unsigned int frame_sz;
887 int err;
888
889 head_skb = NULL;
890 stats->bytes += len - vi->hdr_len;
891
892 if (unlikely(len > truesize)) {
893 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
894 dev->name, len, (unsigned long)ctx);
895 dev->stats.rx_length_errors++;
896 goto err_skb;
897 }
898 rcu_read_lock();
899 xdp_prog = rcu_dereference(rq->xdp_prog);
900 if (xdp_prog) {
901 struct xdp_frame *xdpf;
902 struct page *xdp_page;
903 struct xdp_buff xdp;
904 void *data;
905 u32 act;
906
907
908
909
910
911 if (unlikely(hdr->hdr.gso_type))
912 goto err_xdp;
913
914
915
916
917 frame_sz = headroom ? PAGE_SIZE : truesize;
918
919
920
921
922
923
924
925 if (unlikely(num_buf > 1 ||
926 headroom < virtnet_get_headroom(vi))) {
927
928 xdp_page = xdp_linearize_page(rq, &num_buf,
929 page, offset,
930 VIRTIO_XDP_HEADROOM,
931 &len);
932 frame_sz = PAGE_SIZE;
933
934 if (!xdp_page)
935 goto err_xdp;
936 offset = VIRTIO_XDP_HEADROOM;
937 } else {
938 xdp_page = page;
939 }
940
941
942
943
944 data = page_address(xdp_page) + offset;
945 xdp_init_buff(&xdp, frame_sz - vi->hdr_len, &rq->xdp_rxq);
946 xdp_prepare_buff(&xdp, data - VIRTIO_XDP_HEADROOM + vi->hdr_len,
947 VIRTIO_XDP_HEADROOM, len - vi->hdr_len, true);
948
949 act = bpf_prog_run_xdp(xdp_prog, &xdp);
950 stats->xdp_packets++;
951
952 switch (act) {
953 case XDP_PASS:
954 metasize = xdp.data - xdp.data_meta;
955
956
957
958
959
960
961 offset = xdp.data - page_address(xdp_page) -
962 vi->hdr_len - metasize;
963
964
965
966
967 len = xdp.data_end - xdp.data + vi->hdr_len + metasize;
968
969 if (unlikely(xdp_page != page)) {
970 rcu_read_unlock();
971 put_page(page);
972 head_skb = page_to_skb(vi, rq, xdp_page, offset,
973 len, PAGE_SIZE, false,
974 metasize,
975 VIRTIO_XDP_HEADROOM);
976 return head_skb;
977 }
978 break;
979 case XDP_TX:
980 stats->xdp_tx++;
981 xdpf = xdp_convert_buff_to_frame(&xdp);
982 if (unlikely(!xdpf))
983 goto err_xdp;
984 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
985 if (unlikely(!err)) {
986 xdp_return_frame_rx_napi(xdpf);
987 } else if (unlikely(err < 0)) {
988 trace_xdp_exception(vi->dev, xdp_prog, act);
989 if (unlikely(xdp_page != page))
990 put_page(xdp_page);
991 goto err_xdp;
992 }
993 *xdp_xmit |= VIRTIO_XDP_TX;
994 if (unlikely(xdp_page != page))
995 put_page(page);
996 rcu_read_unlock();
997 goto xdp_xmit;
998 case XDP_REDIRECT:
999 stats->xdp_redirects++;
1000 err = xdp_do_redirect(dev, &xdp, xdp_prog);
1001 if (err) {
1002 if (unlikely(xdp_page != page))
1003 put_page(xdp_page);
1004 goto err_xdp;
1005 }
1006 *xdp_xmit |= VIRTIO_XDP_REDIR;
1007 if (unlikely(xdp_page != page))
1008 put_page(page);
1009 rcu_read_unlock();
1010 goto xdp_xmit;
1011 default:
1012 bpf_warn_invalid_xdp_action(act);
1013 fallthrough;
1014 case XDP_ABORTED:
1015 trace_xdp_exception(vi->dev, xdp_prog, act);
1016 fallthrough;
1017 case XDP_DROP:
1018 if (unlikely(xdp_page != page))
1019 __free_pages(xdp_page, 0);
1020 goto err_xdp;
1021 }
1022 }
1023 rcu_read_unlock();
1024
1025 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
1026 metasize, headroom);
1027 curr_skb = head_skb;
1028
1029 if (unlikely(!curr_skb))
1030 goto err_skb;
1031 while (--num_buf) {
1032 int num_skb_frags;
1033
1034 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
1035 if (unlikely(!buf)) {
1036 pr_debug("%s: rx error: %d buffers out of %d missing\n",
1037 dev->name, num_buf,
1038 virtio16_to_cpu(vi->vdev,
1039 hdr->num_buffers));
1040 dev->stats.rx_length_errors++;
1041 goto err_buf;
1042 }
1043
1044 stats->bytes += len;
1045 page = virt_to_head_page(buf);
1046
1047 truesize = mergeable_ctx_to_truesize(ctx);
1048 if (unlikely(len > truesize)) {
1049 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1050 dev->name, len, (unsigned long)ctx);
1051 dev->stats.rx_length_errors++;
1052 goto err_skb;
1053 }
1054
1055 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
1056 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
1057 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
1058
1059 if (unlikely(!nskb))
1060 goto err_skb;
1061 if (curr_skb == head_skb)
1062 skb_shinfo(curr_skb)->frag_list = nskb;
1063 else
1064 curr_skb->next = nskb;
1065 curr_skb = nskb;
1066 head_skb->truesize += nskb->truesize;
1067 num_skb_frags = 0;
1068 }
1069 if (curr_skb != head_skb) {
1070 head_skb->data_len += len;
1071 head_skb->len += len;
1072 head_skb->truesize += truesize;
1073 }
1074 offset = buf - page_address(page);
1075 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
1076 put_page(page);
1077 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
1078 len, truesize);
1079 } else {
1080 skb_add_rx_frag(curr_skb, num_skb_frags, page,
1081 offset, len, truesize);
1082 }
1083 }
1084
1085 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
1086 return head_skb;
1087
1088err_xdp:
1089 rcu_read_unlock();
1090 stats->xdp_drops++;
1091err_skb:
1092 put_page(page);
1093 while (num_buf-- > 1) {
1094 buf = virtqueue_get_buf(rq->vq, &len);
1095 if (unlikely(!buf)) {
1096 pr_debug("%s: rx error: %d buffers missing\n",
1097 dev->name, num_buf);
1098 dev->stats.rx_length_errors++;
1099 break;
1100 }
1101 stats->bytes += len;
1102 page = virt_to_head_page(buf);
1103 put_page(page);
1104 }
1105err_buf:
1106 stats->drops++;
1107 dev_kfree_skb(head_skb);
1108xdp_xmit:
1109 return NULL;
1110}
1111
1112static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
1113 void *buf, unsigned int len, void **ctx,
1114 unsigned int *xdp_xmit,
1115 struct virtnet_rq_stats *stats)
1116{
1117 struct net_device *dev = vi->dev;
1118 struct sk_buff *skb;
1119 struct virtio_net_hdr_mrg_rxbuf *hdr;
1120
1121 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
1122 pr_debug("%s: short packet %i\n", dev->name, len);
1123 dev->stats.rx_length_errors++;
1124 if (vi->mergeable_rx_bufs) {
1125 put_page(virt_to_head_page(buf));
1126 } else if (vi->big_packets) {
1127 give_pages(rq, buf);
1128 } else {
1129 put_page(virt_to_head_page(buf));
1130 }
1131 return;
1132 }
1133
1134 if (vi->mergeable_rx_bufs)
1135 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
1136 stats);
1137 else if (vi->big_packets)
1138 skb = receive_big(dev, vi, rq, buf, len, stats);
1139 else
1140 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
1141
1142 if (unlikely(!skb))
1143 return;
1144
1145 hdr = skb_vnet_hdr(skb);
1146
1147 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
1148 skb->ip_summed = CHECKSUM_UNNECESSARY;
1149
1150 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
1151 virtio_is_little_endian(vi->vdev))) {
1152 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
1153 dev->name, hdr->hdr.gso_type,
1154 hdr->hdr.gso_size);
1155 goto frame_err;
1156 }
1157
1158 skb_record_rx_queue(skb, vq2rxq(rq->vq));
1159 skb->protocol = eth_type_trans(skb, dev);
1160 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
1161 ntohs(skb->protocol), skb->len, skb->pkt_type);
1162
1163 napi_gro_receive(&rq->napi, skb);
1164 return;
1165
1166frame_err:
1167 dev->stats.rx_frame_errors++;
1168 dev_kfree_skb(skb);
1169}
1170
1171
1172
1173
1174
1175
1176static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1177 gfp_t gfp)
1178{
1179 struct page_frag *alloc_frag = &rq->alloc_frag;
1180 char *buf;
1181 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1182 void *ctx = (void *)(unsigned long)xdp_headroom;
1183 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1184 int err;
1185
1186 len = SKB_DATA_ALIGN(len) +
1187 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1188 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
1189 return -ENOMEM;
1190
1191 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1192 get_page(alloc_frag->page);
1193 alloc_frag->offset += len;
1194 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,
1195 vi->hdr_len + GOOD_PACKET_LEN);
1196 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1197 if (err < 0)
1198 put_page(virt_to_head_page(buf));
1199 return err;
1200}
1201
1202static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1203 gfp_t gfp)
1204{
1205 struct page *first, *list = NULL;
1206 char *p;
1207 int i, err, offset;
1208
1209 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
1210
1211
1212 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
1213 first = get_a_page(rq, gfp);
1214 if (!first) {
1215 if (list)
1216 give_pages(rq, list);
1217 return -ENOMEM;
1218 }
1219 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1220
1221
1222 first->private = (unsigned long)list;
1223 list = first;
1224 }
1225
1226 first = get_a_page(rq, gfp);
1227 if (!first) {
1228 give_pages(rq, list);
1229 return -ENOMEM;
1230 }
1231 p = page_address(first);
1232
1233
1234
1235 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1236
1237
1238 offset = sizeof(struct padded_vnet_hdr);
1239 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1240
1241
1242 first->private = (unsigned long)list;
1243 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
1244 first, gfp);
1245 if (err < 0)
1246 give_pages(rq, first);
1247
1248 return err;
1249}
1250
1251static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1252 struct ewma_pkt_len *avg_pkt_len,
1253 unsigned int room)
1254{
1255 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1256 unsigned int len;
1257
1258 if (room)
1259 return PAGE_SIZE - room;
1260
1261 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1262 rq->min_buf_len, PAGE_SIZE - hdr_len);
1263
1264 return ALIGN(len, L1_CACHE_BYTES);
1265}
1266
1267static int add_recvbuf_mergeable(struct virtnet_info *vi,
1268 struct receive_queue *rq, gfp_t gfp)
1269{
1270 struct page_frag *alloc_frag = &rq->alloc_frag;
1271 unsigned int headroom = virtnet_get_headroom(vi);
1272 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1273 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1274 char *buf;
1275 void *ctx;
1276 int err;
1277 unsigned int len, hole;
1278
1279
1280
1281
1282
1283 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1284 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
1285 return -ENOMEM;
1286
1287 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1288 buf += headroom;
1289 get_page(alloc_frag->page);
1290 alloc_frag->offset += len + room;
1291 hole = alloc_frag->size - alloc_frag->offset;
1292 if (hole < len + room) {
1293
1294
1295
1296
1297 len += hole;
1298 alloc_frag->offset += hole;
1299 }
1300
1301 sg_init_one(rq->sg, buf, len);
1302 ctx = mergeable_len_to_ctx(len, headroom);
1303 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1304 if (err < 0)
1305 put_page(virt_to_head_page(buf));
1306
1307 return err;
1308}
1309
1310
1311
1312
1313
1314
1315
1316
1317static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
1318 gfp_t gfp)
1319{
1320 int err;
1321 bool oom;
1322
1323 do {
1324 if (vi->mergeable_rx_bufs)
1325 err = add_recvbuf_mergeable(vi, rq, gfp);
1326 else if (vi->big_packets)
1327 err = add_recvbuf_big(vi, rq, gfp);
1328 else
1329 err = add_recvbuf_small(vi, rq, gfp);
1330
1331 oom = err == -ENOMEM;
1332 if (err)
1333 break;
1334 } while (rq->vq->num_free);
1335 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
1336 unsigned long flags;
1337
1338 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
1339 rq->stats.kicks++;
1340 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
1341 }
1342
1343 return !oom;
1344}
1345
1346static void skb_recv_done(struct virtqueue *rvq)
1347{
1348 struct virtnet_info *vi = rvq->vdev->priv;
1349 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
1350
1351 virtqueue_napi_schedule(&rq->napi, rvq);
1352}
1353
1354static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
1355{
1356 napi_enable(napi);
1357
1358
1359
1360
1361
1362 local_bh_disable();
1363 virtqueue_napi_schedule(napi, vq);
1364 local_bh_enable();
1365}
1366
1367static void virtnet_napi_tx_enable(struct virtnet_info *vi,
1368 struct virtqueue *vq,
1369 struct napi_struct *napi)
1370{
1371 if (!napi->weight)
1372 return;
1373
1374
1375
1376
1377 if (!vi->affinity_hint_set) {
1378 napi->weight = 0;
1379 return;
1380 }
1381
1382 return virtnet_napi_enable(vq, napi);
1383}
1384
1385static void virtnet_napi_tx_disable(struct napi_struct *napi)
1386{
1387 if (napi->weight)
1388 napi_disable(napi);
1389}
1390
1391static void refill_work(struct work_struct *work)
1392{
1393 struct virtnet_info *vi =
1394 container_of(work, struct virtnet_info, refill.work);
1395 bool still_empty;
1396 int i;
1397
1398 for (i = 0; i < vi->curr_queue_pairs; i++) {
1399 struct receive_queue *rq = &vi->rq[i];
1400
1401 napi_disable(&rq->napi);
1402 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
1403 virtnet_napi_enable(rq->vq, &rq->napi);
1404
1405
1406
1407
1408 if (still_empty)
1409 schedule_delayed_work(&vi->refill, HZ/2);
1410 }
1411}
1412
1413static int virtnet_receive(struct receive_queue *rq, int budget,
1414 unsigned int *xdp_xmit)
1415{
1416 struct virtnet_info *vi = rq->vq->vdev->priv;
1417 struct virtnet_rq_stats stats = {};
1418 unsigned int len;
1419 void *buf;
1420 int i;
1421
1422 if (!vi->big_packets || vi->mergeable_rx_bufs) {
1423 void *ctx;
1424
1425 while (stats.packets < budget &&
1426 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
1427 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
1428 stats.packets++;
1429 }
1430 } else {
1431 while (stats.packets < budget &&
1432 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
1433 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
1434 stats.packets++;
1435 }
1436 }
1437
1438 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
1439 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
1440 schedule_delayed_work(&vi->refill, 0);
1441 }
1442
1443 u64_stats_update_begin(&rq->stats.syncp);
1444 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
1445 size_t offset = virtnet_rq_stats_desc[i].offset;
1446 u64 *item;
1447
1448 item = (u64 *)((u8 *)&rq->stats + offset);
1449 *item += *(u64 *)((u8 *)&stats + offset);
1450 }
1451 u64_stats_update_end(&rq->stats.syncp);
1452
1453 return stats.packets;
1454}
1455
1456static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
1457{
1458 unsigned int len;
1459 unsigned int packets = 0;
1460 unsigned int bytes = 0;
1461 void *ptr;
1462
1463 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1464 if (likely(!is_xdp_frame(ptr))) {
1465 struct sk_buff *skb = ptr;
1466
1467 pr_debug("Sent skb %p\n", skb);
1468
1469 bytes += skb->len;
1470 napi_consume_skb(skb, in_napi);
1471 } else {
1472 struct xdp_frame *frame = ptr_to_xdp(ptr);
1473
1474 bytes += frame->len;
1475 xdp_return_frame(frame);
1476 }
1477 packets++;
1478 }
1479
1480
1481
1482
1483 if (!packets)
1484 return;
1485
1486 u64_stats_update_begin(&sq->stats.syncp);
1487 sq->stats.bytes += bytes;
1488 sq->stats.packets += packets;
1489 u64_stats_update_end(&sq->stats.syncp);
1490}
1491
1492static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
1493{
1494 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1495 return false;
1496 else if (q < vi->curr_queue_pairs)
1497 return true;
1498 else
1499 return false;
1500}
1501
1502static void virtnet_poll_cleantx(struct receive_queue *rq)
1503{
1504 struct virtnet_info *vi = rq->vq->vdev->priv;
1505 unsigned int index = vq2rxq(rq->vq);
1506 struct send_queue *sq = &vi->sq[index];
1507 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
1508
1509 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
1510 return;
1511
1512 if (__netif_tx_trylock(txq)) {
1513 do {
1514 virtqueue_disable_cb(sq->vq);
1515 free_old_xmit_skbs(sq, true);
1516 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
1517
1518 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1519 netif_tx_wake_queue(txq);
1520
1521 __netif_tx_unlock(txq);
1522 }
1523}
1524
1525static int virtnet_poll(struct napi_struct *napi, int budget)
1526{
1527 struct receive_queue *rq =
1528 container_of(napi, struct receive_queue, napi);
1529 struct virtnet_info *vi = rq->vq->vdev->priv;
1530 struct send_queue *sq;
1531 unsigned int received;
1532 unsigned int xdp_xmit = 0;
1533
1534 virtnet_poll_cleantx(rq);
1535
1536 received = virtnet_receive(rq, budget, &xdp_xmit);
1537
1538
1539 if (received < budget)
1540 virtqueue_napi_complete(napi, rq->vq, received);
1541
1542 if (xdp_xmit & VIRTIO_XDP_REDIR)
1543 xdp_do_flush();
1544
1545 if (xdp_xmit & VIRTIO_XDP_TX) {
1546 sq = virtnet_xdp_get_sq(vi);
1547 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1548 u64_stats_update_begin(&sq->stats.syncp);
1549 sq->stats.kicks++;
1550 u64_stats_update_end(&sq->stats.syncp);
1551 }
1552 virtnet_xdp_put_sq(vi, sq);
1553 }
1554
1555 return received;
1556}
1557
1558static int virtnet_open(struct net_device *dev)
1559{
1560 struct virtnet_info *vi = netdev_priv(dev);
1561 int i, err;
1562
1563 for (i = 0; i < vi->max_queue_pairs; i++) {
1564 if (i < vi->curr_queue_pairs)
1565
1566 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1567 schedule_delayed_work(&vi->refill, 0);
1568
1569 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
1570 if (err < 0)
1571 return err;
1572
1573 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
1574 MEM_TYPE_PAGE_SHARED, NULL);
1575 if (err < 0) {
1576 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1577 return err;
1578 }
1579
1580 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
1581 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
1582 }
1583
1584 return 0;
1585}
1586
1587static int virtnet_poll_tx(struct napi_struct *napi, int budget)
1588{
1589 struct send_queue *sq = container_of(napi, struct send_queue, napi);
1590 struct virtnet_info *vi = sq->vq->vdev->priv;
1591 unsigned int index = vq2txq(sq->vq);
1592 struct netdev_queue *txq;
1593 int opaque;
1594 bool done;
1595
1596 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
1597
1598 napi_complete_done(napi, 0);
1599 return 0;
1600 }
1601
1602 txq = netdev_get_tx_queue(vi->dev, index);
1603 __netif_tx_lock(txq, raw_smp_processor_id());
1604 virtqueue_disable_cb(sq->vq);
1605 free_old_xmit_skbs(sq, true);
1606
1607 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1608 netif_tx_wake_queue(txq);
1609
1610 opaque = virtqueue_enable_cb_prepare(sq->vq);
1611
1612 done = napi_complete_done(napi, 0);
1613
1614 if (!done)
1615 virtqueue_disable_cb(sq->vq);
1616
1617 __netif_tx_unlock(txq);
1618
1619 if (done) {
1620 if (unlikely(virtqueue_poll(sq->vq, opaque))) {
1621 if (napi_schedule_prep(napi)) {
1622 __netif_tx_lock(txq, raw_smp_processor_id());
1623 virtqueue_disable_cb(sq->vq);
1624 __netif_tx_unlock(txq);
1625 __napi_schedule(napi);
1626 }
1627 }
1628 }
1629
1630 return 0;
1631}
1632
1633static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1634{
1635 struct virtio_net_hdr_mrg_rxbuf *hdr;
1636 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1637 struct virtnet_info *vi = sq->vq->vdev->priv;
1638 int num_sg;
1639 unsigned hdr_len = vi->hdr_len;
1640 bool can_push;
1641
1642 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1643
1644 can_push = vi->any_header_sg &&
1645 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1646 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1647
1648
1649 if (can_push)
1650 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1651 else
1652 hdr = skb_vnet_hdr(skb);
1653
1654 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1655 virtio_is_little_endian(vi->vdev), false,
1656 0))
1657 return -EPROTO;
1658
1659 if (vi->mergeable_rx_bufs)
1660 hdr->num_buffers = 0;
1661
1662 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1663 if (can_push) {
1664 __skb_push(skb, hdr_len);
1665 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1666 if (unlikely(num_sg < 0))
1667 return num_sg;
1668
1669 __skb_pull(skb, hdr_len);
1670 } else {
1671 sg_set_buf(sq->sg, hdr, hdr_len);
1672 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
1673 if (unlikely(num_sg < 0))
1674 return num_sg;
1675 num_sg++;
1676 }
1677 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1678}
1679
1680static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1681{
1682 struct virtnet_info *vi = netdev_priv(dev);
1683 int qnum = skb_get_queue_mapping(skb);
1684 struct send_queue *sq = &vi->sq[qnum];
1685 int err;
1686 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1687 bool kick = !netdev_xmit_more();
1688 bool use_napi = sq->napi.weight;
1689
1690
1691 do {
1692 if (use_napi)
1693 virtqueue_disable_cb(sq->vq);
1694
1695 free_old_xmit_skbs(sq, false);
1696
1697 } while (use_napi && kick &&
1698 unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
1699
1700
1701 skb_tx_timestamp(skb);
1702
1703
1704 err = xmit_skb(sq, skb);
1705
1706
1707 if (unlikely(err)) {
1708 dev->stats.tx_fifo_errors++;
1709 if (net_ratelimit())
1710 dev_warn(&dev->dev,
1711 "Unexpected TXQ (%d) queue failure: %d\n",
1712 qnum, err);
1713 dev->stats.tx_dropped++;
1714 dev_kfree_skb_any(skb);
1715 return NETDEV_TX_OK;
1716 }
1717
1718
1719 if (!use_napi) {
1720 skb_orphan(skb);
1721 nf_reset_ct(skb);
1722 }
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1735 netif_stop_subqueue(dev, qnum);
1736 if (!use_napi &&
1737 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1738
1739 free_old_xmit_skbs(sq, false);
1740 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1741 netif_start_subqueue(dev, qnum);
1742 virtqueue_disable_cb(sq->vq);
1743 }
1744 }
1745 }
1746
1747 if (kick || netif_xmit_stopped(txq)) {
1748 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1749 u64_stats_update_begin(&sq->stats.syncp);
1750 sq->stats.kicks++;
1751 u64_stats_update_end(&sq->stats.syncp);
1752 }
1753 }
1754
1755 return NETDEV_TX_OK;
1756}
1757
1758
1759
1760
1761
1762
1763static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1764 struct scatterlist *out)
1765{
1766 struct scatterlist *sgs[4], hdr, stat;
1767 unsigned out_num = 0, tmp;
1768 int ret;
1769
1770
1771 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1772
1773 vi->ctrl->status = ~0;
1774 vi->ctrl->hdr.class = class;
1775 vi->ctrl->hdr.cmd = cmd;
1776
1777 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
1778 sgs[out_num++] = &hdr;
1779
1780 if (out)
1781 sgs[out_num++] = out;
1782
1783
1784 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
1785 sgs[out_num] = &stat;
1786
1787 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1788 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1789 if (ret < 0) {
1790 dev_warn(&vi->vdev->dev,
1791 "Failed to add sgs for command vq: %d\n.", ret);
1792 return false;
1793 }
1794
1795 if (unlikely(!virtqueue_kick(vi->cvq)))
1796 return vi->ctrl->status == VIRTIO_NET_OK;
1797
1798
1799
1800
1801 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1802 !virtqueue_is_broken(vi->cvq))
1803 cpu_relax();
1804
1805 return vi->ctrl->status == VIRTIO_NET_OK;
1806}
1807
1808static int virtnet_set_mac_address(struct net_device *dev, void *p)
1809{
1810 struct virtnet_info *vi = netdev_priv(dev);
1811 struct virtio_device *vdev = vi->vdev;
1812 int ret;
1813 struct sockaddr *addr;
1814 struct scatterlist sg;
1815
1816 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
1817 return -EOPNOTSUPP;
1818
1819 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
1820 if (!addr)
1821 return -ENOMEM;
1822
1823 ret = eth_prepare_mac_addr_change(dev, addr);
1824 if (ret)
1825 goto out;
1826
1827 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1828 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1829 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1830 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1831 dev_warn(&vdev->dev,
1832 "Failed to set mac address by vq command.\n");
1833 ret = -EINVAL;
1834 goto out;
1835 }
1836 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1837 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1838 unsigned int i;
1839
1840
1841 for (i = 0; i < dev->addr_len; i++)
1842 virtio_cwrite8(vdev,
1843 offsetof(struct virtio_net_config, mac) +
1844 i, addr->sa_data[i]);
1845 }
1846
1847 eth_commit_mac_addr_change(dev, p);
1848 ret = 0;
1849
1850out:
1851 kfree(addr);
1852 return ret;
1853}
1854
1855static void virtnet_stats(struct net_device *dev,
1856 struct rtnl_link_stats64 *tot)
1857{
1858 struct virtnet_info *vi = netdev_priv(dev);
1859 unsigned int start;
1860 int i;
1861
1862 for (i = 0; i < vi->max_queue_pairs; i++) {
1863 u64 tpackets, tbytes, rpackets, rbytes, rdrops;
1864 struct receive_queue *rq = &vi->rq[i];
1865 struct send_queue *sq = &vi->sq[i];
1866
1867 do {
1868 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
1869 tpackets = sq->stats.packets;
1870 tbytes = sq->stats.bytes;
1871 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
1872
1873 do {
1874 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
1875 rpackets = rq->stats.packets;
1876 rbytes = rq->stats.bytes;
1877 rdrops = rq->stats.drops;
1878 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
1879
1880 tot->rx_packets += rpackets;
1881 tot->tx_packets += tpackets;
1882 tot->rx_bytes += rbytes;
1883 tot->tx_bytes += tbytes;
1884 tot->rx_dropped += rdrops;
1885 }
1886
1887 tot->tx_dropped = dev->stats.tx_dropped;
1888 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1889 tot->rx_length_errors = dev->stats.rx_length_errors;
1890 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1891}
1892
1893static void virtnet_ack_link_announce(struct virtnet_info *vi)
1894{
1895 rtnl_lock();
1896 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1897 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1898 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1899 rtnl_unlock();
1900}
1901
1902static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1903{
1904 struct scatterlist sg;
1905 struct net_device *dev = vi->dev;
1906
1907 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1908 return 0;
1909
1910 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1911 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
1912
1913 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1914 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1915 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1916 queue_pairs);
1917 return -EINVAL;
1918 } else {
1919 vi->curr_queue_pairs = queue_pairs;
1920
1921 if (dev->flags & IFF_UP)
1922 schedule_delayed_work(&vi->refill, 0);
1923 }
1924
1925 return 0;
1926}
1927
1928static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1929{
1930 int err;
1931
1932 rtnl_lock();
1933 err = _virtnet_set_queues(vi, queue_pairs);
1934 rtnl_unlock();
1935 return err;
1936}
1937
1938static int virtnet_close(struct net_device *dev)
1939{
1940 struct virtnet_info *vi = netdev_priv(dev);
1941 int i;
1942
1943
1944 cancel_delayed_work_sync(&vi->refill);
1945
1946 for (i = 0; i < vi->max_queue_pairs; i++) {
1947 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1948 napi_disable(&vi->rq[i].napi);
1949 virtnet_napi_tx_disable(&vi->sq[i].napi);
1950 }
1951
1952 return 0;
1953}
1954
1955static void virtnet_set_rx_mode(struct net_device *dev)
1956{
1957 struct virtnet_info *vi = netdev_priv(dev);
1958 struct scatterlist sg[2];
1959 struct virtio_net_ctrl_mac *mac_data;
1960 struct netdev_hw_addr *ha;
1961 int uc_count;
1962 int mc_count;
1963 void *buf;
1964 int i;
1965
1966
1967 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1968 return;
1969
1970 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
1971 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1972
1973 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
1974
1975 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1976 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1977 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1978 vi->ctrl->promisc ? "en" : "dis");
1979
1980 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
1981
1982 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1983 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1984 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1985 vi->ctrl->allmulti ? "en" : "dis");
1986
1987 uc_count = netdev_uc_count(dev);
1988 mc_count = netdev_mc_count(dev);
1989
1990 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1991 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1992 mac_data = buf;
1993 if (!buf)
1994 return;
1995
1996 sg_init_table(sg, 2);
1997
1998
1999 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
2000 i = 0;
2001 netdev_for_each_uc_addr(ha, dev)
2002 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
2003
2004 sg_set_buf(&sg[0], mac_data,
2005 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
2006
2007
2008 mac_data = (void *)&mac_data->macs[uc_count][0];
2009
2010 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
2011 i = 0;
2012 netdev_for_each_mc_addr(ha, dev)
2013 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
2014
2015 sg_set_buf(&sg[1], mac_data,
2016 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
2017
2018 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
2019 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
2020 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
2021
2022 kfree(buf);
2023}
2024
2025static int virtnet_vlan_rx_add_vid(struct net_device *dev,
2026 __be16 proto, u16 vid)
2027{
2028 struct virtnet_info *vi = netdev_priv(dev);
2029 struct scatterlist sg;
2030
2031 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
2032 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
2033
2034 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
2035 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
2036 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
2037 return 0;
2038}
2039
2040static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
2041 __be16 proto, u16 vid)
2042{
2043 struct virtnet_info *vi = netdev_priv(dev);
2044 struct scatterlist sg;
2045
2046 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
2047 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
2048
2049 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
2050 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
2051 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
2052 return 0;
2053}
2054
2055static void virtnet_clean_affinity(struct virtnet_info *vi)
2056{
2057 int i;
2058
2059 if (vi->affinity_hint_set) {
2060 for (i = 0; i < vi->max_queue_pairs; i++) {
2061 virtqueue_set_affinity(vi->rq[i].vq, NULL);
2062 virtqueue_set_affinity(vi->sq[i].vq, NULL);
2063 }
2064
2065 vi->affinity_hint_set = false;
2066 }
2067}
2068
2069static void virtnet_set_affinity(struct virtnet_info *vi)
2070{
2071 cpumask_var_t mask;
2072 int stragglers;
2073 int group_size;
2074 int i, j, cpu;
2075 int num_cpu;
2076 int stride;
2077
2078 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
2079 virtnet_clean_affinity(vi);
2080 return;
2081 }
2082
2083 num_cpu = num_online_cpus();
2084 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
2085 stragglers = num_cpu >= vi->curr_queue_pairs ?
2086 num_cpu % vi->curr_queue_pairs :
2087 0;
2088 cpu = cpumask_next(-1, cpu_online_mask);
2089
2090 for (i = 0; i < vi->curr_queue_pairs; i++) {
2091 group_size = stride + (i < stragglers ? 1 : 0);
2092
2093 for (j = 0; j < group_size; j++) {
2094 cpumask_set_cpu(cpu, mask);
2095 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
2096 nr_cpu_ids, false);
2097 }
2098 virtqueue_set_affinity(vi->rq[i].vq, mask);
2099 virtqueue_set_affinity(vi->sq[i].vq, mask);
2100 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS);
2101 cpumask_clear(mask);
2102 }
2103
2104 vi->affinity_hint_set = true;
2105 free_cpumask_var(mask);
2106}
2107
2108static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
2109{
2110 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2111 node);
2112 virtnet_set_affinity(vi);
2113 return 0;
2114}
2115
2116static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
2117{
2118 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2119 node_dead);
2120 virtnet_set_affinity(vi);
2121 return 0;
2122}
2123
2124static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
2125{
2126 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2127 node);
2128
2129 virtnet_clean_affinity(vi);
2130 return 0;
2131}
2132
2133static enum cpuhp_state virtionet_online;
2134
2135static int virtnet_cpu_notif_add(struct virtnet_info *vi)
2136{
2137 int ret;
2138
2139 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
2140 if (ret)
2141 return ret;
2142 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2143 &vi->node_dead);
2144 if (!ret)
2145 return ret;
2146 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2147 return ret;
2148}
2149
2150static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
2151{
2152 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2153 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2154 &vi->node_dead);
2155}
2156
2157static void virtnet_get_ringparam(struct net_device *dev,
2158 struct ethtool_ringparam *ring)
2159{
2160 struct virtnet_info *vi = netdev_priv(dev);
2161
2162 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
2163 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
2164 ring->rx_pending = ring->rx_max_pending;
2165 ring->tx_pending = ring->tx_max_pending;
2166}
2167
2168
2169static void virtnet_get_drvinfo(struct net_device *dev,
2170 struct ethtool_drvinfo *info)
2171{
2172 struct virtnet_info *vi = netdev_priv(dev);
2173 struct virtio_device *vdev = vi->vdev;
2174
2175 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
2176 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
2177 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
2178
2179}
2180
2181
2182static int virtnet_set_channels(struct net_device *dev,
2183 struct ethtool_channels *channels)
2184{
2185 struct virtnet_info *vi = netdev_priv(dev);
2186 u16 queue_pairs = channels->combined_count;
2187 int err;
2188
2189
2190
2191
2192 if (channels->rx_count || channels->tx_count || channels->other_count)
2193 return -EINVAL;
2194
2195 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
2196 return -EINVAL;
2197
2198
2199
2200
2201
2202 if (vi->rq[0].xdp_prog)
2203 return -EINVAL;
2204
2205 cpus_read_lock();
2206 err = _virtnet_set_queues(vi, queue_pairs);
2207 if (err) {
2208 cpus_read_unlock();
2209 goto err;
2210 }
2211 virtnet_set_affinity(vi);
2212 cpus_read_unlock();
2213
2214 netif_set_real_num_tx_queues(dev, queue_pairs);
2215 netif_set_real_num_rx_queues(dev, queue_pairs);
2216 err:
2217 return err;
2218}
2219
2220static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2221{
2222 struct virtnet_info *vi = netdev_priv(dev);
2223 unsigned int i, j;
2224 u8 *p = data;
2225
2226 switch (stringset) {
2227 case ETH_SS_STATS:
2228 for (i = 0; i < vi->curr_queue_pairs; i++) {
2229 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++)
2230 ethtool_sprintf(&p, "rx_queue_%u_%s", i,
2231 virtnet_rq_stats_desc[j].desc);
2232 }
2233
2234 for (i = 0; i < vi->curr_queue_pairs; i++) {
2235 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++)
2236 ethtool_sprintf(&p, "tx_queue_%u_%s", i,
2237 virtnet_sq_stats_desc[j].desc);
2238 }
2239 break;
2240 }
2241}
2242
2243static int virtnet_get_sset_count(struct net_device *dev, int sset)
2244{
2245 struct virtnet_info *vi = netdev_priv(dev);
2246
2247 switch (sset) {
2248 case ETH_SS_STATS:
2249 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
2250 VIRTNET_SQ_STATS_LEN);
2251 default:
2252 return -EOPNOTSUPP;
2253 }
2254}
2255
2256static void virtnet_get_ethtool_stats(struct net_device *dev,
2257 struct ethtool_stats *stats, u64 *data)
2258{
2259 struct virtnet_info *vi = netdev_priv(dev);
2260 unsigned int idx = 0, start, i, j;
2261 const u8 *stats_base;
2262 size_t offset;
2263
2264 for (i = 0; i < vi->curr_queue_pairs; i++) {
2265 struct receive_queue *rq = &vi->rq[i];
2266
2267 stats_base = (u8 *)&rq->stats;
2268 do {
2269 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
2270 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2271 offset = virtnet_rq_stats_desc[j].offset;
2272 data[idx + j] = *(u64 *)(stats_base + offset);
2273 }
2274 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
2275 idx += VIRTNET_RQ_STATS_LEN;
2276 }
2277
2278 for (i = 0; i < vi->curr_queue_pairs; i++) {
2279 struct send_queue *sq = &vi->sq[i];
2280
2281 stats_base = (u8 *)&sq->stats;
2282 do {
2283 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
2284 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2285 offset = virtnet_sq_stats_desc[j].offset;
2286 data[idx + j] = *(u64 *)(stats_base + offset);
2287 }
2288 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
2289 idx += VIRTNET_SQ_STATS_LEN;
2290 }
2291}
2292
2293static void virtnet_get_channels(struct net_device *dev,
2294 struct ethtool_channels *channels)
2295{
2296 struct virtnet_info *vi = netdev_priv(dev);
2297
2298 channels->combined_count = vi->curr_queue_pairs;
2299 channels->max_combined = vi->max_queue_pairs;
2300 channels->max_other = 0;
2301 channels->rx_count = 0;
2302 channels->tx_count = 0;
2303 channels->other_count = 0;
2304}
2305
2306static int virtnet_set_link_ksettings(struct net_device *dev,
2307 const struct ethtool_link_ksettings *cmd)
2308{
2309 struct virtnet_info *vi = netdev_priv(dev);
2310
2311 return ethtool_virtdev_set_link_ksettings(dev, cmd,
2312 &vi->speed, &vi->duplex);
2313}
2314
2315static int virtnet_get_link_ksettings(struct net_device *dev,
2316 struct ethtool_link_ksettings *cmd)
2317{
2318 struct virtnet_info *vi = netdev_priv(dev);
2319
2320 cmd->base.speed = vi->speed;
2321 cmd->base.duplex = vi->duplex;
2322 cmd->base.port = PORT_OTHER;
2323
2324 return 0;
2325}
2326
2327static int virtnet_set_coalesce(struct net_device *dev,
2328 struct ethtool_coalesce *ec,
2329 struct kernel_ethtool_coalesce *kernel_coal,
2330 struct netlink_ext_ack *extack)
2331{
2332 struct virtnet_info *vi = netdev_priv(dev);
2333 int i, napi_weight;
2334
2335 if (ec->tx_max_coalesced_frames > 1 ||
2336 ec->rx_max_coalesced_frames != 1)
2337 return -EINVAL;
2338
2339 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
2340 if (napi_weight ^ vi->sq[0].napi.weight) {
2341 if (dev->flags & IFF_UP)
2342 return -EBUSY;
2343 for (i = 0; i < vi->max_queue_pairs; i++)
2344 vi->sq[i].napi.weight = napi_weight;
2345 }
2346
2347 return 0;
2348}
2349
2350static int virtnet_get_coalesce(struct net_device *dev,
2351 struct ethtool_coalesce *ec,
2352 struct kernel_ethtool_coalesce *kernel_coal,
2353 struct netlink_ext_ack *extack)
2354{
2355 struct ethtool_coalesce ec_default = {
2356 .cmd = ETHTOOL_GCOALESCE,
2357 .rx_max_coalesced_frames = 1,
2358 };
2359 struct virtnet_info *vi = netdev_priv(dev);
2360
2361 memcpy(ec, &ec_default, sizeof(ec_default));
2362
2363 if (vi->sq[0].napi.weight)
2364 ec->tx_max_coalesced_frames = 1;
2365
2366 return 0;
2367}
2368
2369static void virtnet_init_settings(struct net_device *dev)
2370{
2371 struct virtnet_info *vi = netdev_priv(dev);
2372
2373 vi->speed = SPEED_UNKNOWN;
2374 vi->duplex = DUPLEX_UNKNOWN;
2375}
2376
2377static void virtnet_update_settings(struct virtnet_info *vi)
2378{
2379 u32 speed;
2380 u8 duplex;
2381
2382 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
2383 return;
2384
2385 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
2386
2387 if (ethtool_validate_speed(speed))
2388 vi->speed = speed;
2389
2390 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
2391
2392 if (ethtool_validate_duplex(duplex))
2393 vi->duplex = duplex;
2394}
2395
2396static const struct ethtool_ops virtnet_ethtool_ops = {
2397 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
2398 .get_drvinfo = virtnet_get_drvinfo,
2399 .get_link = ethtool_op_get_link,
2400 .get_ringparam = virtnet_get_ringparam,
2401 .get_strings = virtnet_get_strings,
2402 .get_sset_count = virtnet_get_sset_count,
2403 .get_ethtool_stats = virtnet_get_ethtool_stats,
2404 .set_channels = virtnet_set_channels,
2405 .get_channels = virtnet_get_channels,
2406 .get_ts_info = ethtool_op_get_ts_info,
2407 .get_link_ksettings = virtnet_get_link_ksettings,
2408 .set_link_ksettings = virtnet_set_link_ksettings,
2409 .set_coalesce = virtnet_set_coalesce,
2410 .get_coalesce = virtnet_get_coalesce,
2411};
2412
2413static void virtnet_freeze_down(struct virtio_device *vdev)
2414{
2415 struct virtnet_info *vi = vdev->priv;
2416 int i;
2417
2418
2419 flush_work(&vi->config_work);
2420
2421 netif_tx_lock_bh(vi->dev);
2422 netif_device_detach(vi->dev);
2423 netif_tx_unlock_bh(vi->dev);
2424 cancel_delayed_work_sync(&vi->refill);
2425
2426 if (netif_running(vi->dev)) {
2427 for (i = 0; i < vi->max_queue_pairs; i++) {
2428 napi_disable(&vi->rq[i].napi);
2429 virtnet_napi_tx_disable(&vi->sq[i].napi);
2430 }
2431 }
2432}
2433
2434static int init_vqs(struct virtnet_info *vi);
2435
2436static int virtnet_restore_up(struct virtio_device *vdev)
2437{
2438 struct virtnet_info *vi = vdev->priv;
2439 int err, i;
2440
2441 err = init_vqs(vi);
2442 if (err)
2443 return err;
2444
2445 virtio_device_ready(vdev);
2446
2447 if (netif_running(vi->dev)) {
2448 for (i = 0; i < vi->curr_queue_pairs; i++)
2449 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2450 schedule_delayed_work(&vi->refill, 0);
2451
2452 for (i = 0; i < vi->max_queue_pairs; i++) {
2453 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2454 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2455 &vi->sq[i].napi);
2456 }
2457 }
2458
2459 netif_tx_lock_bh(vi->dev);
2460 netif_device_attach(vi->dev);
2461 netif_tx_unlock_bh(vi->dev);
2462 return err;
2463}
2464
2465static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
2466{
2467 struct scatterlist sg;
2468 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
2469
2470 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
2471
2472 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
2473 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
2474 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
2475 return -EINVAL;
2476 }
2477
2478 return 0;
2479}
2480
2481static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
2482{
2483 u64 offloads = 0;
2484
2485 if (!vi->guest_offloads)
2486 return 0;
2487
2488 return virtnet_set_guest_offloads(vi, offloads);
2489}
2490
2491static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
2492{
2493 u64 offloads = vi->guest_offloads;
2494
2495 if (!vi->guest_offloads)
2496 return 0;
2497
2498 return virtnet_set_guest_offloads(vi, offloads);
2499}
2500
2501static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
2502 struct netlink_ext_ack *extack)
2503{
2504 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
2505 struct virtnet_info *vi = netdev_priv(dev);
2506 struct bpf_prog *old_prog;
2507 u16 xdp_qp = 0, curr_qp;
2508 int i, err;
2509
2510 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
2511 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2512 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2513 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
2514 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
2515 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
2516 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first");
2517 return -EOPNOTSUPP;
2518 }
2519
2520 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
2521 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
2522 return -EINVAL;
2523 }
2524
2525 if (dev->mtu > max_sz) {
2526 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
2527 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
2528 return -EINVAL;
2529 }
2530
2531 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
2532 if (prog)
2533 xdp_qp = nr_cpu_ids;
2534
2535
2536 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
2537 netdev_warn(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n",
2538 curr_qp + xdp_qp, vi->max_queue_pairs);
2539 xdp_qp = 0;
2540 }
2541
2542 old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
2543 if (!prog && !old_prog)
2544 return 0;
2545
2546 if (prog)
2547 bpf_prog_add(prog, vi->max_queue_pairs - 1);
2548
2549
2550 if (netif_running(dev)) {
2551 for (i = 0; i < vi->max_queue_pairs; i++) {
2552 napi_disable(&vi->rq[i].napi);
2553 virtnet_napi_tx_disable(&vi->sq[i].napi);
2554 }
2555 }
2556
2557 if (!prog) {
2558 for (i = 0; i < vi->max_queue_pairs; i++) {
2559 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2560 if (i == 0)
2561 virtnet_restore_guest_offloads(vi);
2562 }
2563 synchronize_net();
2564 }
2565
2566 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
2567 if (err)
2568 goto err;
2569 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
2570 vi->xdp_queue_pairs = xdp_qp;
2571
2572 if (prog) {
2573 vi->xdp_enabled = true;
2574 for (i = 0; i < vi->max_queue_pairs; i++) {
2575 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2576 if (i == 0 && !old_prog)
2577 virtnet_clear_guest_offloads(vi);
2578 }
2579 } else {
2580 vi->xdp_enabled = false;
2581 }
2582
2583 for (i = 0; i < vi->max_queue_pairs; i++) {
2584 if (old_prog)
2585 bpf_prog_put(old_prog);
2586 if (netif_running(dev)) {
2587 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2588 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2589 &vi->sq[i].napi);
2590 }
2591 }
2592
2593 return 0;
2594
2595err:
2596 if (!prog) {
2597 virtnet_clear_guest_offloads(vi);
2598 for (i = 0; i < vi->max_queue_pairs; i++)
2599 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
2600 }
2601
2602 if (netif_running(dev)) {
2603 for (i = 0; i < vi->max_queue_pairs; i++) {
2604 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2605 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2606 &vi->sq[i].napi);
2607 }
2608 }
2609 if (prog)
2610 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
2611 return err;
2612}
2613
2614static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
2615{
2616 switch (xdp->command) {
2617 case XDP_SETUP_PROG:
2618 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
2619 default:
2620 return -EINVAL;
2621 }
2622}
2623
2624static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
2625 size_t len)
2626{
2627 struct virtnet_info *vi = netdev_priv(dev);
2628 int ret;
2629
2630 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2631 return -EOPNOTSUPP;
2632
2633 ret = snprintf(buf, len, "sby");
2634 if (ret >= len)
2635 return -EOPNOTSUPP;
2636
2637 return 0;
2638}
2639
2640static int virtnet_set_features(struct net_device *dev,
2641 netdev_features_t features)
2642{
2643 struct virtnet_info *vi = netdev_priv(dev);
2644 u64 offloads;
2645 int err;
2646
2647 if ((dev->features ^ features) & NETIF_F_GRO_HW) {
2648 if (vi->xdp_enabled)
2649 return -EBUSY;
2650
2651 if (features & NETIF_F_GRO_HW)
2652 offloads = vi->guest_offloads_capable;
2653 else
2654 offloads = vi->guest_offloads_capable &
2655 ~GUEST_OFFLOAD_GRO_HW_MASK;
2656
2657 err = virtnet_set_guest_offloads(vi, offloads);
2658 if (err)
2659 return err;
2660 vi->guest_offloads = offloads;
2661 }
2662
2663 return 0;
2664}
2665
2666static const struct net_device_ops virtnet_netdev = {
2667 .ndo_open = virtnet_open,
2668 .ndo_stop = virtnet_close,
2669 .ndo_start_xmit = start_xmit,
2670 .ndo_validate_addr = eth_validate_addr,
2671 .ndo_set_mac_address = virtnet_set_mac_address,
2672 .ndo_set_rx_mode = virtnet_set_rx_mode,
2673 .ndo_get_stats64 = virtnet_stats,
2674 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
2675 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
2676 .ndo_bpf = virtnet_xdp,
2677 .ndo_xdp_xmit = virtnet_xdp_xmit,
2678 .ndo_features_check = passthru_features_check,
2679 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
2680 .ndo_set_features = virtnet_set_features,
2681};
2682
2683static void virtnet_config_changed_work(struct work_struct *work)
2684{
2685 struct virtnet_info *vi =
2686 container_of(work, struct virtnet_info, config_work);
2687 u16 v;
2688
2689 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
2690 struct virtio_net_config, status, &v) < 0)
2691 return;
2692
2693 if (v & VIRTIO_NET_S_ANNOUNCE) {
2694 netdev_notify_peers(vi->dev);
2695 virtnet_ack_link_announce(vi);
2696 }
2697
2698
2699 v &= VIRTIO_NET_S_LINK_UP;
2700
2701 if (vi->status == v)
2702 return;
2703
2704 vi->status = v;
2705
2706 if (vi->status & VIRTIO_NET_S_LINK_UP) {
2707 virtnet_update_settings(vi);
2708 netif_carrier_on(vi->dev);
2709 netif_tx_wake_all_queues(vi->dev);
2710 } else {
2711 netif_carrier_off(vi->dev);
2712 netif_tx_stop_all_queues(vi->dev);
2713 }
2714}
2715
2716static void virtnet_config_changed(struct virtio_device *vdev)
2717{
2718 struct virtnet_info *vi = vdev->priv;
2719
2720 schedule_work(&vi->config_work);
2721}
2722
2723static void virtnet_free_queues(struct virtnet_info *vi)
2724{
2725 int i;
2726
2727 for (i = 0; i < vi->max_queue_pairs; i++) {
2728 __netif_napi_del(&vi->rq[i].napi);
2729 __netif_napi_del(&vi->sq[i].napi);
2730 }
2731
2732
2733
2734
2735 synchronize_net();
2736
2737 kfree(vi->rq);
2738 kfree(vi->sq);
2739 kfree(vi->ctrl);
2740}
2741
2742static void _free_receive_bufs(struct virtnet_info *vi)
2743{
2744 struct bpf_prog *old_prog;
2745 int i;
2746
2747 for (i = 0; i < vi->max_queue_pairs; i++) {
2748 while (vi->rq[i].pages)
2749 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
2750
2751 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2752 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
2753 if (old_prog)
2754 bpf_prog_put(old_prog);
2755 }
2756}
2757
2758static void free_receive_bufs(struct virtnet_info *vi)
2759{
2760 rtnl_lock();
2761 _free_receive_bufs(vi);
2762 rtnl_unlock();
2763}
2764
2765static void free_receive_page_frags(struct virtnet_info *vi)
2766{
2767 int i;
2768 for (i = 0; i < vi->max_queue_pairs; i++)
2769 if (vi->rq[i].alloc_frag.page)
2770 put_page(vi->rq[i].alloc_frag.page);
2771}
2772
2773static void free_unused_bufs(struct virtnet_info *vi)
2774{
2775 void *buf;
2776 int i;
2777
2778 for (i = 0; i < vi->max_queue_pairs; i++) {
2779 struct virtqueue *vq = vi->sq[i].vq;
2780 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2781 if (!is_xdp_frame(buf))
2782 dev_kfree_skb(buf);
2783 else
2784 xdp_return_frame(ptr_to_xdp(buf));
2785 }
2786 }
2787
2788 for (i = 0; i < vi->max_queue_pairs; i++) {
2789 struct virtqueue *vq = vi->rq[i].vq;
2790
2791 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2792 if (vi->mergeable_rx_bufs) {
2793 put_page(virt_to_head_page(buf));
2794 } else if (vi->big_packets) {
2795 give_pages(&vi->rq[i], buf);
2796 } else {
2797 put_page(virt_to_head_page(buf));
2798 }
2799 }
2800 }
2801}
2802
2803static void virtnet_del_vqs(struct virtnet_info *vi)
2804{
2805 struct virtio_device *vdev = vi->vdev;
2806
2807 virtnet_clean_affinity(vi);
2808
2809 vdev->config->del_vqs(vdev);
2810
2811 virtnet_free_queues(vi);
2812}
2813
2814
2815
2816
2817
2818static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
2819{
2820 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2821 unsigned int rq_size = virtqueue_get_vring_size(vq);
2822 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
2823 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
2824 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
2825
2826 return max(max(min_buf_len, hdr_len) - hdr_len,
2827 (unsigned int)GOOD_PACKET_LEN);
2828}
2829
2830static int virtnet_find_vqs(struct virtnet_info *vi)
2831{
2832 vq_callback_t **callbacks;
2833 struct virtqueue **vqs;
2834 int ret = -ENOMEM;
2835 int i, total_vqs;
2836 const char **names;
2837 bool *ctx;
2838
2839
2840
2841
2842
2843 total_vqs = vi->max_queue_pairs * 2 +
2844 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
2845
2846
2847 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
2848 if (!vqs)
2849 goto err_vq;
2850 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
2851 if (!callbacks)
2852 goto err_callback;
2853 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
2854 if (!names)
2855 goto err_names;
2856 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2857 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
2858 if (!ctx)
2859 goto err_ctx;
2860 } else {
2861 ctx = NULL;
2862 }
2863
2864
2865 if (vi->has_cvq) {
2866 callbacks[total_vqs - 1] = NULL;
2867 names[total_vqs - 1] = "control";
2868 }
2869
2870
2871 for (i = 0; i < vi->max_queue_pairs; i++) {
2872 callbacks[rxq2vq(i)] = skb_recv_done;
2873 callbacks[txq2vq(i)] = skb_xmit_done;
2874 sprintf(vi->rq[i].name, "input.%d", i);
2875 sprintf(vi->sq[i].name, "output.%d", i);
2876 names[rxq2vq(i)] = vi->rq[i].name;
2877 names[txq2vq(i)] = vi->sq[i].name;
2878 if (ctx)
2879 ctx[rxq2vq(i)] = true;
2880 }
2881
2882 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks,
2883 names, ctx, NULL);
2884 if (ret)
2885 goto err_find;
2886
2887 if (vi->has_cvq) {
2888 vi->cvq = vqs[total_vqs - 1];
2889 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
2890 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2891 }
2892
2893 for (i = 0; i < vi->max_queue_pairs; i++) {
2894 vi->rq[i].vq = vqs[rxq2vq(i)];
2895 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
2896 vi->sq[i].vq = vqs[txq2vq(i)];
2897 }
2898
2899
2900
2901
2902err_find:
2903 kfree(ctx);
2904err_ctx:
2905 kfree(names);
2906err_names:
2907 kfree(callbacks);
2908err_callback:
2909 kfree(vqs);
2910err_vq:
2911 return ret;
2912}
2913
2914static int virtnet_alloc_queues(struct virtnet_info *vi)
2915{
2916 int i;
2917
2918 if (vi->has_cvq) {
2919 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
2920 if (!vi->ctrl)
2921 goto err_ctrl;
2922 } else {
2923 vi->ctrl = NULL;
2924 }
2925 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
2926 if (!vi->sq)
2927 goto err_sq;
2928 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
2929 if (!vi->rq)
2930 goto err_rq;
2931
2932 INIT_DELAYED_WORK(&vi->refill, refill_work);
2933 for (i = 0; i < vi->max_queue_pairs; i++) {
2934 vi->rq[i].pages = NULL;
2935 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2936 napi_weight);
2937 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
2938 napi_tx ? napi_weight : 0);
2939
2940 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2941 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2942 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2943
2944 u64_stats_init(&vi->rq[i].stats.syncp);
2945 u64_stats_init(&vi->sq[i].stats.syncp);
2946 }
2947
2948 return 0;
2949
2950err_rq:
2951 kfree(vi->sq);
2952err_sq:
2953 kfree(vi->ctrl);
2954err_ctrl:
2955 return -ENOMEM;
2956}
2957
2958static int init_vqs(struct virtnet_info *vi)
2959{
2960 int ret;
2961
2962
2963 ret = virtnet_alloc_queues(vi);
2964 if (ret)
2965 goto err;
2966
2967 ret = virtnet_find_vqs(vi);
2968 if (ret)
2969 goto err_free;
2970
2971 cpus_read_lock();
2972 virtnet_set_affinity(vi);
2973 cpus_read_unlock();
2974
2975 return 0;
2976
2977err_free:
2978 virtnet_free_queues(vi);
2979err:
2980 return ret;
2981}
2982
2983#ifdef CONFIG_SYSFS
2984static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2985 char *buf)
2986{
2987 struct virtnet_info *vi = netdev_priv(queue->dev);
2988 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2989 unsigned int headroom = virtnet_get_headroom(vi);
2990 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2991 struct ewma_pkt_len *avg;
2992
2993 BUG_ON(queue_index >= vi->max_queue_pairs);
2994 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2995 return sprintf(buf, "%u\n",
2996 get_mergeable_buf_len(&vi->rq[queue_index], avg,
2997 SKB_DATA_ALIGN(headroom + tailroom)));
2998}
2999
3000static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
3001 __ATTR_RO(mergeable_rx_buffer_size);
3002
3003static struct attribute *virtio_net_mrg_rx_attrs[] = {
3004 &mergeable_rx_buffer_size_attribute.attr,
3005 NULL
3006};
3007
3008static const struct attribute_group virtio_net_mrg_rx_group = {
3009 .name = "virtio_net",
3010 .attrs = virtio_net_mrg_rx_attrs
3011};
3012#endif
3013
3014static bool virtnet_fail_on_feature(struct virtio_device *vdev,
3015 unsigned int fbit,
3016 const char *fname, const char *dname)
3017{
3018 if (!virtio_has_feature(vdev, fbit))
3019 return false;
3020
3021 dev_err(&vdev->dev, "device advertises feature %s but not %s",
3022 fname, dname);
3023
3024 return true;
3025}
3026
3027#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
3028 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
3029
3030static bool virtnet_validate_features(struct virtio_device *vdev)
3031{
3032 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
3033 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
3034 "VIRTIO_NET_F_CTRL_VQ") ||
3035 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
3036 "VIRTIO_NET_F_CTRL_VQ") ||
3037 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
3038 "VIRTIO_NET_F_CTRL_VQ") ||
3039 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
3040 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
3041 "VIRTIO_NET_F_CTRL_VQ"))) {
3042 return false;
3043 }
3044
3045 return true;
3046}
3047
3048#define MIN_MTU ETH_MIN_MTU
3049#define MAX_MTU ETH_MAX_MTU
3050
3051static int virtnet_validate(struct virtio_device *vdev)
3052{
3053 if (!vdev->config->get) {
3054 dev_err(&vdev->dev, "%s failure: config access disabled\n",
3055 __func__);
3056 return -EINVAL;
3057 }
3058
3059 if (!virtnet_validate_features(vdev))
3060 return -EINVAL;
3061
3062 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3063 int mtu = virtio_cread16(vdev,
3064 offsetof(struct virtio_net_config,
3065 mtu));
3066 if (mtu < MIN_MTU)
3067 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
3068 }
3069
3070 return 0;
3071}
3072
3073static int virtnet_probe(struct virtio_device *vdev)
3074{
3075 int i, err = -ENOMEM;
3076 struct net_device *dev;
3077 struct virtnet_info *vi;
3078 u16 max_queue_pairs;
3079 int mtu;
3080
3081
3082 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
3083 struct virtio_net_config,
3084 max_virtqueue_pairs, &max_queue_pairs);
3085
3086
3087 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
3088 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
3089 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3090 max_queue_pairs = 1;
3091
3092
3093 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
3094 if (!dev)
3095 return -ENOMEM;
3096
3097
3098 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
3099 IFF_TX_SKB_NO_LINEAR;
3100 dev->netdev_ops = &virtnet_netdev;
3101 dev->features = NETIF_F_HIGHDMA;
3102
3103 dev->ethtool_ops = &virtnet_ethtool_ops;
3104 SET_NETDEV_DEV(dev, &vdev->dev);
3105
3106
3107 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
3108
3109 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3110 if (csum)
3111 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3112
3113 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
3114 dev->hw_features |= NETIF_F_TSO
3115 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
3116 }
3117
3118 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
3119 dev->hw_features |= NETIF_F_TSO;
3120 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
3121 dev->hw_features |= NETIF_F_TSO6;
3122 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
3123 dev->hw_features |= NETIF_F_TSO_ECN;
3124
3125 dev->features |= NETIF_F_GSO_ROBUST;
3126
3127 if (gso)
3128 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
3129
3130 }
3131 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
3132 dev->features |= NETIF_F_RXCSUM;
3133 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3134 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
3135 dev->features |= NETIF_F_GRO_HW;
3136 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
3137 dev->hw_features |= NETIF_F_GRO_HW;
3138
3139 dev->vlan_features = dev->features;
3140
3141
3142 dev->min_mtu = MIN_MTU;
3143 dev->max_mtu = MAX_MTU;
3144
3145
3146 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
3147 virtio_cread_bytes(vdev,
3148 offsetof(struct virtio_net_config, mac),
3149 dev->dev_addr, dev->addr_len);
3150 else
3151 eth_hw_addr_random(dev);
3152
3153
3154 vi = netdev_priv(dev);
3155 vi->dev = dev;
3156 vi->vdev = vdev;
3157 vdev->priv = vi;
3158
3159 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
3160
3161
3162 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3163 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
3164 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
3165 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
3166 vi->big_packets = true;
3167
3168 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
3169 vi->mergeable_rx_bufs = true;
3170
3171 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
3172 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3173 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
3174 else
3175 vi->hdr_len = sizeof(struct virtio_net_hdr);
3176
3177 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
3178 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3179 vi->any_header_sg = true;
3180
3181 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3182 vi->has_cvq = true;
3183
3184 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3185 mtu = virtio_cread16(vdev,
3186 offsetof(struct virtio_net_config,
3187 mtu));
3188 if (mtu < dev->min_mtu) {
3189
3190
3191
3192 dev_err(&vdev->dev,
3193 "device MTU appears to have changed it is now %d < %d",
3194 mtu, dev->min_mtu);
3195 err = -EINVAL;
3196 goto free;
3197 }
3198
3199 dev->mtu = mtu;
3200 dev->max_mtu = mtu;
3201
3202
3203 if (dev->mtu > ETH_DATA_LEN)
3204 vi->big_packets = true;
3205 }
3206
3207 if (vi->any_header_sg)
3208 dev->needed_headroom = vi->hdr_len;
3209
3210
3211 if (num_online_cpus() >= max_queue_pairs)
3212 vi->curr_queue_pairs = max_queue_pairs;
3213 else
3214 vi->curr_queue_pairs = num_online_cpus();
3215 vi->max_queue_pairs = max_queue_pairs;
3216
3217
3218 err = init_vqs(vi);
3219 if (err)
3220 goto free;
3221
3222#ifdef CONFIG_SYSFS
3223 if (vi->mergeable_rx_bufs)
3224 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
3225#endif
3226 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
3227 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
3228
3229 virtnet_init_settings(dev);
3230
3231 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3232 vi->failover = net_failover_create(vi->dev);
3233 if (IS_ERR(vi->failover)) {
3234 err = PTR_ERR(vi->failover);
3235 goto free_vqs;
3236 }
3237 }
3238
3239 err = register_netdev(dev);
3240 if (err) {
3241 pr_debug("virtio_net: registering device failed\n");
3242 goto free_failover;
3243 }
3244
3245 virtio_device_ready(vdev);
3246
3247 err = virtnet_cpu_notif_add(vi);
3248 if (err) {
3249 pr_debug("virtio_net: registering cpu notifier failed\n");
3250 goto free_unregister_netdev;
3251 }
3252
3253 virtnet_set_queues(vi, vi->curr_queue_pairs);
3254
3255
3256
3257 netif_carrier_off(dev);
3258 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3259 schedule_work(&vi->config_work);
3260 } else {
3261 vi->status = VIRTIO_NET_S_LINK_UP;
3262 virtnet_update_settings(vi);
3263 netif_carrier_on(dev);
3264 }
3265
3266 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
3267 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
3268 set_bit(guest_offloads[i], &vi->guest_offloads);
3269 vi->guest_offloads_capable = vi->guest_offloads;
3270
3271 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
3272 dev->name, max_queue_pairs);
3273
3274 return 0;
3275
3276free_unregister_netdev:
3277 vi->vdev->config->reset(vdev);
3278
3279 unregister_netdev(dev);
3280free_failover:
3281 net_failover_destroy(vi->failover);
3282free_vqs:
3283 cancel_delayed_work_sync(&vi->refill);
3284 free_receive_page_frags(vi);
3285 virtnet_del_vqs(vi);
3286free:
3287 free_netdev(dev);
3288 return err;
3289}
3290
3291static void remove_vq_common(struct virtnet_info *vi)
3292{
3293 vi->vdev->config->reset(vi->vdev);
3294
3295
3296 free_unused_bufs(vi);
3297
3298 free_receive_bufs(vi);
3299
3300 free_receive_page_frags(vi);
3301
3302 virtnet_del_vqs(vi);
3303}
3304
3305static void virtnet_remove(struct virtio_device *vdev)
3306{
3307 struct virtnet_info *vi = vdev->priv;
3308
3309 virtnet_cpu_notif_remove(vi);
3310
3311
3312 flush_work(&vi->config_work);
3313
3314 unregister_netdev(vi->dev);
3315
3316 net_failover_destroy(vi->failover);
3317
3318 remove_vq_common(vi);
3319
3320 free_netdev(vi->dev);
3321}
3322
3323static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
3324{
3325 struct virtnet_info *vi = vdev->priv;
3326
3327 virtnet_cpu_notif_remove(vi);
3328 virtnet_freeze_down(vdev);
3329 remove_vq_common(vi);
3330
3331 return 0;
3332}
3333
3334static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
3335{
3336 struct virtnet_info *vi = vdev->priv;
3337 int err;
3338
3339 err = virtnet_restore_up(vdev);
3340 if (err)
3341 return err;
3342 virtnet_set_queues(vi, vi->curr_queue_pairs);
3343
3344 err = virtnet_cpu_notif_add(vi);
3345 if (err) {
3346 virtnet_freeze_down(vdev);
3347 remove_vq_common(vi);
3348 return err;
3349 }
3350
3351 return 0;
3352}
3353
3354static struct virtio_device_id id_table[] = {
3355 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
3356 { 0 },
3357};
3358
3359#define VIRTNET_FEATURES \
3360 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
3361 VIRTIO_NET_F_MAC, \
3362 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
3363 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
3364 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
3365 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
3366 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
3367 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
3368 VIRTIO_NET_F_CTRL_MAC_ADDR, \
3369 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
3370 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY
3371
3372static unsigned int features[] = {
3373 VIRTNET_FEATURES,
3374};
3375
3376static unsigned int features_legacy[] = {
3377 VIRTNET_FEATURES,
3378 VIRTIO_NET_F_GSO,
3379 VIRTIO_F_ANY_LAYOUT,
3380};
3381
3382static struct virtio_driver virtio_net_driver = {
3383 .feature_table = features,
3384 .feature_table_size = ARRAY_SIZE(features),
3385 .feature_table_legacy = features_legacy,
3386 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
3387 .driver.name = KBUILD_MODNAME,
3388 .driver.owner = THIS_MODULE,
3389 .id_table = id_table,
3390 .validate = virtnet_validate,
3391 .probe = virtnet_probe,
3392 .remove = virtnet_remove,
3393 .config_changed = virtnet_config_changed,
3394#ifdef CONFIG_PM_SLEEP
3395 .freeze = virtnet_freeze,
3396 .restore = virtnet_restore,
3397#endif
3398};
3399
3400static __init int virtio_net_driver_init(void)
3401{
3402 int ret;
3403
3404 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
3405 virtnet_cpu_online,
3406 virtnet_cpu_down_prep);
3407 if (ret < 0)
3408 goto out;
3409 virtionet_online = ret;
3410 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
3411 NULL, virtnet_cpu_dead);
3412 if (ret)
3413 goto err_dead;
3414
3415 ret = register_virtio_driver(&virtio_net_driver);
3416 if (ret)
3417 goto err_virtio;
3418 return 0;
3419err_virtio:
3420 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3421err_dead:
3422 cpuhp_remove_multi_state(virtionet_online);
3423out:
3424 return ret;
3425}
3426module_init(virtio_net_driver_init);
3427
3428static __exit void virtio_net_driver_exit(void)
3429{
3430 unregister_virtio_driver(&virtio_net_driver);
3431 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3432 cpuhp_remove_multi_state(virtionet_online);
3433}
3434module_exit(virtio_net_driver_exit);
3435
3436MODULE_DEVICE_TABLE(virtio, id_table);
3437MODULE_DESCRIPTION("Virtio network driver");
3438MODULE_LICENSE("GPL");
3439