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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* A network driver using virtio.
3 *
4 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
5 */
6//#define DEBUG
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 <linux/dim.h>
23#include <net/route.h>
24#include <net/xdp.h>
25#include <net/net_failover.h>
26#include <net/netdev_rx_queue.h>
27
28static int napi_weight = NAPI_POLL_WEIGHT;
29module_param(napi_weight, int, 0444);
30
31static bool csum = true, gso = true, napi_tx = true;
32module_param(csum, bool, 0444);
33module_param(gso, bool, 0444);
34module_param(napi_tx, bool, 0644);
35
36/* FIXME: MTU in config. */
37#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
38#define GOOD_COPY_LEN 128
39
40#define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
41
42/* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */
43#define VIRTIO_XDP_HEADROOM 256
44
45/* Separating two types of XDP xmit */
46#define VIRTIO_XDP_TX BIT(0)
47#define VIRTIO_XDP_REDIR BIT(1)
48
49#define VIRTIO_XDP_FLAG BIT(0)
50
51/* RX packet size EWMA. The average packet size is used to determine the packet
52 * buffer size when refilling RX rings. As the entire RX ring may be refilled
53 * at once, the weight is chosen so that the EWMA will be insensitive to short-
54 * term, transient changes in packet size.
55 */
56DECLARE_EWMA(pkt_len, 0, 64)
57
58#define VIRTNET_DRIVER_VERSION "1.0.0"
59
60static const unsigned long guest_offloads[] = {
61 VIRTIO_NET_F_GUEST_TSO4,
62 VIRTIO_NET_F_GUEST_TSO6,
63 VIRTIO_NET_F_GUEST_ECN,
64 VIRTIO_NET_F_GUEST_UFO,
65 VIRTIO_NET_F_GUEST_CSUM,
66 VIRTIO_NET_F_GUEST_USO4,
67 VIRTIO_NET_F_GUEST_USO6,
68 VIRTIO_NET_F_GUEST_HDRLEN
69};
70
71#define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
72 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
73 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
74 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
75 (1ULL << VIRTIO_NET_F_GUEST_USO4) | \
76 (1ULL << VIRTIO_NET_F_GUEST_USO6))
77
78struct virtnet_stat_desc {
79 char desc[ETH_GSTRING_LEN];
80 size_t offset;
81};
82
83struct virtnet_sq_free_stats {
84 u64 packets;
85 u64 bytes;
86};
87
88struct virtnet_sq_stats {
89 struct u64_stats_sync syncp;
90 u64_stats_t packets;
91 u64_stats_t bytes;
92 u64_stats_t xdp_tx;
93 u64_stats_t xdp_tx_drops;
94 u64_stats_t kicks;
95 u64_stats_t tx_timeouts;
96};
97
98struct virtnet_rq_stats {
99 struct u64_stats_sync syncp;
100 u64_stats_t packets;
101 u64_stats_t bytes;
102 u64_stats_t drops;
103 u64_stats_t xdp_packets;
104 u64_stats_t xdp_tx;
105 u64_stats_t xdp_redirects;
106 u64_stats_t xdp_drops;
107 u64_stats_t kicks;
108};
109
110#define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
111#define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
112
113static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
114 { "packets", VIRTNET_SQ_STAT(packets) },
115 { "bytes", VIRTNET_SQ_STAT(bytes) },
116 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
117 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
118 { "kicks", VIRTNET_SQ_STAT(kicks) },
119 { "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) },
120};
121
122static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
123 { "packets", VIRTNET_RQ_STAT(packets) },
124 { "bytes", VIRTNET_RQ_STAT(bytes) },
125 { "drops", VIRTNET_RQ_STAT(drops) },
126 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
127 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
128 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
129 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
130 { "kicks", VIRTNET_RQ_STAT(kicks) },
131};
132
133#define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
134#define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
135
136struct virtnet_interrupt_coalesce {
137 u32 max_packets;
138 u32 max_usecs;
139};
140
141/* The dma information of pages allocated at a time. */
142struct virtnet_rq_dma {
143 dma_addr_t addr;
144 u32 ref;
145 u16 len;
146 u16 need_sync;
147};
148
149/* Internal representation of a send virtqueue */
150struct send_queue {
151 /* Virtqueue associated with this send _queue */
152 struct virtqueue *vq;
153
154 /* TX: fragments + linear part + virtio header */
155 struct scatterlist sg[MAX_SKB_FRAGS + 2];
156
157 /* Name of the send queue: output.$index */
158 char name[16];
159
160 struct virtnet_sq_stats stats;
161
162 struct virtnet_interrupt_coalesce intr_coal;
163
164 struct napi_struct napi;
165
166 /* Record whether sq is in reset state. */
167 bool reset;
168};
169
170/* Internal representation of a receive virtqueue */
171struct receive_queue {
172 /* Virtqueue associated with this receive_queue */
173 struct virtqueue *vq;
174
175 struct napi_struct napi;
176
177 struct bpf_prog __rcu *xdp_prog;
178
179 struct virtnet_rq_stats stats;
180
181 /* The number of rx notifications */
182 u16 calls;
183
184 /* Is dynamic interrupt moderation enabled? */
185 bool dim_enabled;
186
187 /* Dynamic Interrupt Moderation */
188 struct dim dim;
189
190 u32 packets_in_napi;
191
192 struct virtnet_interrupt_coalesce intr_coal;
193
194 /* Chain pages by the private ptr. */
195 struct page *pages;
196
197 /* Average packet length for mergeable receive buffers. */
198 struct ewma_pkt_len mrg_avg_pkt_len;
199
200 /* Page frag for packet buffer allocation. */
201 struct page_frag alloc_frag;
202
203 /* RX: fragments + linear part + virtio header */
204 struct scatterlist sg[MAX_SKB_FRAGS + 2];
205
206 /* Min single buffer size for mergeable buffers case. */
207 unsigned int min_buf_len;
208
209 /* Name of this receive queue: input.$index */
210 char name[16];
211
212 struct xdp_rxq_info xdp_rxq;
213
214 /* Record the last dma info to free after new pages is allocated. */
215 struct virtnet_rq_dma *last_dma;
216
217 /* Do dma by self */
218 bool do_dma;
219};
220
221/* This structure can contain rss message with maximum settings for indirection table and keysize
222 * Note, that default structure that describes RSS configuration virtio_net_rss_config
223 * contains same info but can't handle table values.
224 * In any case, structure would be passed to virtio hw through sg_buf split by parts
225 * because table sizes may be differ according to the device configuration.
226 */
227#define VIRTIO_NET_RSS_MAX_KEY_SIZE 40
228#define VIRTIO_NET_RSS_MAX_TABLE_LEN 128
229struct virtio_net_ctrl_rss {
230 u32 hash_types;
231 u16 indirection_table_mask;
232 u16 unclassified_queue;
233 u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN];
234 u16 max_tx_vq;
235 u8 hash_key_length;
236 u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
237};
238
239/* Control VQ buffers: protected by the rtnl lock */
240struct control_buf {
241 struct virtio_net_ctrl_hdr hdr;
242 virtio_net_ctrl_ack status;
243 struct virtio_net_ctrl_mq mq;
244 u8 promisc;
245 u8 allmulti;
246 __virtio16 vid;
247 __virtio64 offloads;
248 struct virtio_net_ctrl_rss rss;
249 struct virtio_net_ctrl_coal_tx coal_tx;
250 struct virtio_net_ctrl_coal_rx coal_rx;
251 struct virtio_net_ctrl_coal_vq coal_vq;
252};
253
254struct virtnet_info {
255 struct virtio_device *vdev;
256 struct virtqueue *cvq;
257 struct net_device *dev;
258 struct send_queue *sq;
259 struct receive_queue *rq;
260 unsigned int status;
261
262 /* Max # of queue pairs supported by the device */
263 u16 max_queue_pairs;
264
265 /* # of queue pairs currently used by the driver */
266 u16 curr_queue_pairs;
267
268 /* # of XDP queue pairs currently used by the driver */
269 u16 xdp_queue_pairs;
270
271 /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
272 bool xdp_enabled;
273
274 /* I like... big packets and I cannot lie! */
275 bool big_packets;
276
277 /* number of sg entries allocated for big packets */
278 unsigned int big_packets_num_skbfrags;
279
280 /* Host will merge rx buffers for big packets (shake it! shake it!) */
281 bool mergeable_rx_bufs;
282
283 /* Host supports rss and/or hash report */
284 bool has_rss;
285 bool has_rss_hash_report;
286 u8 rss_key_size;
287 u16 rss_indir_table_size;
288 u32 rss_hash_types_supported;
289 u32 rss_hash_types_saved;
290
291 /* Has control virtqueue */
292 bool has_cvq;
293
294 /* Host can handle any s/g split between our header and packet data */
295 bool any_header_sg;
296
297 /* Packet virtio header size */
298 u8 hdr_len;
299
300 /* Work struct for delayed refilling if we run low on memory. */
301 struct delayed_work refill;
302
303 /* Is delayed refill enabled? */
304 bool refill_enabled;
305
306 /* The lock to synchronize the access to refill_enabled */
307 spinlock_t refill_lock;
308
309 /* Work struct for config space updates */
310 struct work_struct config_work;
311
312 /* Work struct for setting rx mode */
313 struct work_struct rx_mode_work;
314
315 /* OK to queue work setting RX mode? */
316 bool rx_mode_work_enabled;
317
318 /* Does the affinity hint is set for virtqueues? */
319 bool affinity_hint_set;
320
321 /* CPU hotplug instances for online & dead */
322 struct hlist_node node;
323 struct hlist_node node_dead;
324
325 struct control_buf *ctrl;
326
327 /* Ethtool settings */
328 u8 duplex;
329 u32 speed;
330
331 /* Is rx dynamic interrupt moderation enabled? */
332 bool rx_dim_enabled;
333
334 /* Interrupt coalescing settings */
335 struct virtnet_interrupt_coalesce intr_coal_tx;
336 struct virtnet_interrupt_coalesce intr_coal_rx;
337
338 unsigned long guest_offloads;
339 unsigned long guest_offloads_capable;
340
341 /* failover when STANDBY feature enabled */
342 struct failover *failover;
343};
344
345struct padded_vnet_hdr {
346 struct virtio_net_hdr_v1_hash hdr;
347 /*
348 * hdr is in a separate sg buffer, and data sg buffer shares same page
349 * with this header sg. This padding makes next sg 16 byte aligned
350 * after the header.
351 */
352 char padding[12];
353};
354
355struct virtio_net_common_hdr {
356 union {
357 struct virtio_net_hdr hdr;
358 struct virtio_net_hdr_mrg_rxbuf mrg_hdr;
359 struct virtio_net_hdr_v1_hash hash_v1_hdr;
360 };
361};
362
363static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
364
365static bool is_xdp_frame(void *ptr)
366{
367 return (unsigned long)ptr & VIRTIO_XDP_FLAG;
368}
369
370static void *xdp_to_ptr(struct xdp_frame *ptr)
371{
372 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
373}
374
375static struct xdp_frame *ptr_to_xdp(void *ptr)
376{
377 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
378}
379
380static void __free_old_xmit(struct send_queue *sq, bool in_napi,
381 struct virtnet_sq_free_stats *stats)
382{
383 unsigned int len;
384 void *ptr;
385
386 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
387 ++stats->packets;
388
389 if (!is_xdp_frame(ptr)) {
390 struct sk_buff *skb = ptr;
391
392 pr_debug("Sent skb %p\n", skb);
393
394 stats->bytes += skb->len;
395 napi_consume_skb(skb, in_napi);
396 } else {
397 struct xdp_frame *frame = ptr_to_xdp(ptr);
398
399 stats->bytes += xdp_get_frame_len(frame);
400 xdp_return_frame(frame);
401 }
402 }
403}
404
405/* Converting between virtqueue no. and kernel tx/rx queue no.
406 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
407 */
408static int vq2txq(struct virtqueue *vq)
409{
410 return (vq->index - 1) / 2;
411}
412
413static int txq2vq(int txq)
414{
415 return txq * 2 + 1;
416}
417
418static int vq2rxq(struct virtqueue *vq)
419{
420 return vq->index / 2;
421}
422
423static int rxq2vq(int rxq)
424{
425 return rxq * 2;
426}
427
428static inline struct virtio_net_common_hdr *
429skb_vnet_common_hdr(struct sk_buff *skb)
430{
431 return (struct virtio_net_common_hdr *)skb->cb;
432}
433
434/*
435 * private is used to chain pages for big packets, put the whole
436 * most recent used list in the beginning for reuse
437 */
438static void give_pages(struct receive_queue *rq, struct page *page)
439{
440 struct page *end;
441
442 /* Find end of list, sew whole thing into vi->rq.pages. */
443 for (end = page; end->private; end = (struct page *)end->private);
444 end->private = (unsigned long)rq->pages;
445 rq->pages = page;
446}
447
448static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
449{
450 struct page *p = rq->pages;
451
452 if (p) {
453 rq->pages = (struct page *)p->private;
454 /* clear private here, it is used to chain pages */
455 p->private = 0;
456 } else
457 p = alloc_page(gfp_mask);
458 return p;
459}
460
461static void virtnet_rq_free_buf(struct virtnet_info *vi,
462 struct receive_queue *rq, void *buf)
463{
464 if (vi->mergeable_rx_bufs)
465 put_page(virt_to_head_page(buf));
466 else if (vi->big_packets)
467 give_pages(rq, buf);
468 else
469 put_page(virt_to_head_page(buf));
470}
471
472static void enable_delayed_refill(struct virtnet_info *vi)
473{
474 spin_lock_bh(&vi->refill_lock);
475 vi->refill_enabled = true;
476 spin_unlock_bh(&vi->refill_lock);
477}
478
479static void disable_delayed_refill(struct virtnet_info *vi)
480{
481 spin_lock_bh(&vi->refill_lock);
482 vi->refill_enabled = false;
483 spin_unlock_bh(&vi->refill_lock);
484}
485
486static void enable_rx_mode_work(struct virtnet_info *vi)
487{
488 rtnl_lock();
489 vi->rx_mode_work_enabled = true;
490 rtnl_unlock();
491}
492
493static void disable_rx_mode_work(struct virtnet_info *vi)
494{
495 rtnl_lock();
496 vi->rx_mode_work_enabled = false;
497 rtnl_unlock();
498}
499
500static void virtqueue_napi_schedule(struct napi_struct *napi,
501 struct virtqueue *vq)
502{
503 if (napi_schedule_prep(napi)) {
504 virtqueue_disable_cb(vq);
505 __napi_schedule(napi);
506 }
507}
508
509static bool virtqueue_napi_complete(struct napi_struct *napi,
510 struct virtqueue *vq, int processed)
511{
512 int opaque;
513
514 opaque = virtqueue_enable_cb_prepare(vq);
515 if (napi_complete_done(napi, processed)) {
516 if (unlikely(virtqueue_poll(vq, opaque)))
517 virtqueue_napi_schedule(napi, vq);
518 else
519 return true;
520 } else {
521 virtqueue_disable_cb(vq);
522 }
523
524 return false;
525}
526
527static void skb_xmit_done(struct virtqueue *vq)
528{
529 struct virtnet_info *vi = vq->vdev->priv;
530 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
531
532 /* Suppress further interrupts. */
533 virtqueue_disable_cb(vq);
534
535 if (napi->weight)
536 virtqueue_napi_schedule(napi, vq);
537 else
538 /* We were probably waiting for more output buffers. */
539 netif_wake_subqueue(vi->dev, vq2txq(vq));
540}
541
542#define MRG_CTX_HEADER_SHIFT 22
543static void *mergeable_len_to_ctx(unsigned int truesize,
544 unsigned int headroom)
545{
546 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
547}
548
549static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
550{
551 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
552}
553
554static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
555{
556 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
557}
558
559static struct sk_buff *virtnet_build_skb(void *buf, unsigned int buflen,
560 unsigned int headroom,
561 unsigned int len)
562{
563 struct sk_buff *skb;
564
565 skb = build_skb(buf, buflen);
566 if (unlikely(!skb))
567 return NULL;
568
569 skb_reserve(skb, headroom);
570 skb_put(skb, len);
571
572 return skb;
573}
574
575/* Called from bottom half context */
576static struct sk_buff *page_to_skb(struct virtnet_info *vi,
577 struct receive_queue *rq,
578 struct page *page, unsigned int offset,
579 unsigned int len, unsigned int truesize,
580 unsigned int headroom)
581{
582 struct sk_buff *skb;
583 struct virtio_net_common_hdr *hdr;
584 unsigned int copy, hdr_len, hdr_padded_len;
585 struct page *page_to_free = NULL;
586 int tailroom, shinfo_size;
587 char *p, *hdr_p, *buf;
588
589 p = page_address(page) + offset;
590 hdr_p = p;
591
592 hdr_len = vi->hdr_len;
593 if (vi->mergeable_rx_bufs)
594 hdr_padded_len = hdr_len;
595 else
596 hdr_padded_len = sizeof(struct padded_vnet_hdr);
597
598 buf = p - headroom;
599 len -= hdr_len;
600 offset += hdr_padded_len;
601 p += hdr_padded_len;
602 tailroom = truesize - headroom - hdr_padded_len - len;
603
604 shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
605
606 /* copy small packet so we can reuse these pages */
607 if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) {
608 skb = virtnet_build_skb(buf, truesize, p - buf, len);
609 if (unlikely(!skb))
610 return NULL;
611
612 page = (struct page *)page->private;
613 if (page)
614 give_pages(rq, page);
615 goto ok;
616 }
617
618 /* copy small packet so we can reuse these pages for small data */
619 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
620 if (unlikely(!skb))
621 return NULL;
622
623 /* Copy all frame if it fits skb->head, otherwise
624 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed.
625 */
626 if (len <= skb_tailroom(skb))
627 copy = len;
628 else
629 copy = ETH_HLEN;
630 skb_put_data(skb, p, copy);
631
632 len -= copy;
633 offset += copy;
634
635 if (vi->mergeable_rx_bufs) {
636 if (len)
637 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
638 else
639 page_to_free = page;
640 goto ok;
641 }
642
643 /*
644 * Verify that we can indeed put this data into a skb.
645 * This is here to handle cases when the device erroneously
646 * tries to receive more than is possible. This is usually
647 * the case of a broken device.
648 */
649 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
650 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
651 dev_kfree_skb(skb);
652 return NULL;
653 }
654 BUG_ON(offset >= PAGE_SIZE);
655 while (len) {
656 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
657 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
658 frag_size, truesize);
659 len -= frag_size;
660 page = (struct page *)page->private;
661 offset = 0;
662 }
663
664 if (page)
665 give_pages(rq, page);
666
667ok:
668 hdr = skb_vnet_common_hdr(skb);
669 memcpy(hdr, hdr_p, hdr_len);
670 if (page_to_free)
671 put_page(page_to_free);
672
673 return skb;
674}
675
676static void virtnet_rq_unmap(struct receive_queue *rq, void *buf, u32 len)
677{
678 struct page *page = virt_to_head_page(buf);
679 struct virtnet_rq_dma *dma;
680 void *head;
681 int offset;
682
683 head = page_address(page);
684
685 dma = head;
686
687 --dma->ref;
688
689 if (dma->need_sync && len) {
690 offset = buf - (head + sizeof(*dma));
691
692 virtqueue_dma_sync_single_range_for_cpu(rq->vq, dma->addr,
693 offset, len,
694 DMA_FROM_DEVICE);
695 }
696
697 if (dma->ref)
698 return;
699
700 virtqueue_dma_unmap_single_attrs(rq->vq, dma->addr, dma->len,
701 DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
702 put_page(page);
703}
704
705static void *virtnet_rq_get_buf(struct receive_queue *rq, u32 *len, void **ctx)
706{
707 void *buf;
708
709 buf = virtqueue_get_buf_ctx(rq->vq, len, ctx);
710 if (buf && rq->do_dma)
711 virtnet_rq_unmap(rq, buf, *len);
712
713 return buf;
714}
715
716static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len)
717{
718 struct virtnet_rq_dma *dma;
719 dma_addr_t addr;
720 u32 offset;
721 void *head;
722
723 if (!rq->do_dma) {
724 sg_init_one(rq->sg, buf, len);
725 return;
726 }
727
728 head = page_address(rq->alloc_frag.page);
729
730 offset = buf - head;
731
732 dma = head;
733
734 addr = dma->addr - sizeof(*dma) + offset;
735
736 sg_init_table(rq->sg, 1);
737 rq->sg[0].dma_address = addr;
738 rq->sg[0].length = len;
739}
740
741static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
742{
743 struct page_frag *alloc_frag = &rq->alloc_frag;
744 struct virtnet_rq_dma *dma;
745 void *buf, *head;
746 dma_addr_t addr;
747
748 if (unlikely(!skb_page_frag_refill(size, alloc_frag, gfp)))
749 return NULL;
750
751 head = page_address(alloc_frag->page);
752
753 if (rq->do_dma) {
754 dma = head;
755
756 /* new pages */
757 if (!alloc_frag->offset) {
758 if (rq->last_dma) {
759 /* Now, the new page is allocated, the last dma
760 * will not be used. So the dma can be unmapped
761 * if the ref is 0.
762 */
763 virtnet_rq_unmap(rq, rq->last_dma, 0);
764 rq->last_dma = NULL;
765 }
766
767 dma->len = alloc_frag->size - sizeof(*dma);
768
769 addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1,
770 dma->len, DMA_FROM_DEVICE, 0);
771 if (virtqueue_dma_mapping_error(rq->vq, addr))
772 return NULL;
773
774 dma->addr = addr;
775 dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr);
776
777 /* Add a reference to dma to prevent the entire dma from
778 * being released during error handling. This reference
779 * will be freed after the pages are no longer used.
780 */
781 get_page(alloc_frag->page);
782 dma->ref = 1;
783 alloc_frag->offset = sizeof(*dma);
784
785 rq->last_dma = dma;
786 }
787
788 ++dma->ref;
789 }
790
791 buf = head + alloc_frag->offset;
792
793 get_page(alloc_frag->page);
794 alloc_frag->offset += size;
795
796 return buf;
797}
798
799static void virtnet_rq_set_premapped(struct virtnet_info *vi)
800{
801 int i;
802
803 /* disable for big mode */
804 if (!vi->mergeable_rx_bufs && vi->big_packets)
805 return;
806
807 for (i = 0; i < vi->max_queue_pairs; i++) {
808 if (virtqueue_set_dma_premapped(vi->rq[i].vq))
809 continue;
810
811 vi->rq[i].do_dma = true;
812 }
813}
814
815static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
816{
817 struct virtnet_info *vi = vq->vdev->priv;
818 struct receive_queue *rq;
819 int i = vq2rxq(vq);
820
821 rq = &vi->rq[i];
822
823 if (rq->do_dma)
824 virtnet_rq_unmap(rq, buf, 0);
825
826 virtnet_rq_free_buf(vi, rq, buf);
827}
828
829static void free_old_xmit(struct send_queue *sq, bool in_napi)
830{
831 struct virtnet_sq_free_stats stats = {0};
832
833 __free_old_xmit(sq, in_napi, &stats);
834
835 /* Avoid overhead when no packets have been processed
836 * happens when called speculatively from start_xmit.
837 */
838 if (!stats.packets)
839 return;
840
841 u64_stats_update_begin(&sq->stats.syncp);
842 u64_stats_add(&sq->stats.bytes, stats.bytes);
843 u64_stats_add(&sq->stats.packets, stats.packets);
844 u64_stats_update_end(&sq->stats.syncp);
845}
846
847static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
848{
849 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
850 return false;
851 else if (q < vi->curr_queue_pairs)
852 return true;
853 else
854 return false;
855}
856
857static void check_sq_full_and_disable(struct virtnet_info *vi,
858 struct net_device *dev,
859 struct send_queue *sq)
860{
861 bool use_napi = sq->napi.weight;
862 int qnum;
863
864 qnum = sq - vi->sq;
865
866 /* If running out of space, stop queue to avoid getting packets that we
867 * are then unable to transmit.
868 * An alternative would be to force queuing layer to requeue the skb by
869 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
870 * returned in a normal path of operation: it means that driver is not
871 * maintaining the TX queue stop/start state properly, and causes
872 * the stack to do a non-trivial amount of useless work.
873 * Since most packets only take 1 or 2 ring slots, stopping the queue
874 * early means 16 slots are typically wasted.
875 */
876 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
877 netif_stop_subqueue(dev, qnum);
878 if (use_napi) {
879 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq)))
880 virtqueue_napi_schedule(&sq->napi, sq->vq);
881 } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
882 /* More just got used, free them then recheck. */
883 free_old_xmit(sq, false);
884 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
885 netif_start_subqueue(dev, qnum);
886 virtqueue_disable_cb(sq->vq);
887 }
888 }
889 }
890}
891
892static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
893 struct send_queue *sq,
894 struct xdp_frame *xdpf)
895{
896 struct virtio_net_hdr_mrg_rxbuf *hdr;
897 struct skb_shared_info *shinfo;
898 u8 nr_frags = 0;
899 int err, i;
900
901 if (unlikely(xdpf->headroom < vi->hdr_len))
902 return -EOVERFLOW;
903
904 if (unlikely(xdp_frame_has_frags(xdpf))) {
905 shinfo = xdp_get_shared_info_from_frame(xdpf);
906 nr_frags = shinfo->nr_frags;
907 }
908
909 /* In wrapping function virtnet_xdp_xmit(), we need to free
910 * up the pending old buffers, where we need to calculate the
911 * position of skb_shared_info in xdp_get_frame_len() and
912 * xdp_return_frame(), which will involve to xdpf->data and
913 * xdpf->headroom. Therefore, we need to update the value of
914 * headroom synchronously here.
915 */
916 xdpf->headroom -= vi->hdr_len;
917 xdpf->data -= vi->hdr_len;
918 /* Zero header and leave csum up to XDP layers */
919 hdr = xdpf->data;
920 memset(hdr, 0, vi->hdr_len);
921 xdpf->len += vi->hdr_len;
922
923 sg_init_table(sq->sg, nr_frags + 1);
924 sg_set_buf(sq->sg, xdpf->data, xdpf->len);
925 for (i = 0; i < nr_frags; i++) {
926 skb_frag_t *frag = &shinfo->frags[i];
927
928 sg_set_page(&sq->sg[i + 1], skb_frag_page(frag),
929 skb_frag_size(frag), skb_frag_off(frag));
930 }
931
932 err = virtqueue_add_outbuf(sq->vq, sq->sg, nr_frags + 1,
933 xdp_to_ptr(xdpf), GFP_ATOMIC);
934 if (unlikely(err))
935 return -ENOSPC; /* Caller handle free/refcnt */
936
937 return 0;
938}
939
940/* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on
941 * the current cpu, so it does not need to be locked.
942 *
943 * Here we use marco instead of inline functions because we have to deal with
944 * three issues at the same time: 1. the choice of sq. 2. judge and execute the
945 * lock/unlock of txq 3. make sparse happy. It is difficult for two inline
946 * functions to perfectly solve these three problems at the same time.
947 */
948#define virtnet_xdp_get_sq(vi) ({ \
949 int cpu = smp_processor_id(); \
950 struct netdev_queue *txq; \
951 typeof(vi) v = (vi); \
952 unsigned int qp; \
953 \
954 if (v->curr_queue_pairs > nr_cpu_ids) { \
955 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \
956 qp += cpu; \
957 txq = netdev_get_tx_queue(v->dev, qp); \
958 __netif_tx_acquire(txq); \
959 } else { \
960 qp = cpu % v->curr_queue_pairs; \
961 txq = netdev_get_tx_queue(v->dev, qp); \
962 __netif_tx_lock(txq, cpu); \
963 } \
964 v->sq + qp; \
965})
966
967#define virtnet_xdp_put_sq(vi, q) { \
968 struct netdev_queue *txq; \
969 typeof(vi) v = (vi); \
970 \
971 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \
972 if (v->curr_queue_pairs > nr_cpu_ids) \
973 __netif_tx_release(txq); \
974 else \
975 __netif_tx_unlock(txq); \
976}
977
978static int virtnet_xdp_xmit(struct net_device *dev,
979 int n, struct xdp_frame **frames, u32 flags)
980{
981 struct virtnet_info *vi = netdev_priv(dev);
982 struct virtnet_sq_free_stats stats = {0};
983 struct receive_queue *rq = vi->rq;
984 struct bpf_prog *xdp_prog;
985 struct send_queue *sq;
986 int nxmit = 0;
987 int kicks = 0;
988 int ret;
989 int i;
990
991 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
992 * indicate XDP resources have been successfully allocated.
993 */
994 xdp_prog = rcu_access_pointer(rq->xdp_prog);
995 if (!xdp_prog)
996 return -ENXIO;
997
998 sq = virtnet_xdp_get_sq(vi);
999
1000 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
1001 ret = -EINVAL;
1002 goto out;
1003 }
1004
1005 /* Free up any pending old buffers before queueing new ones. */
1006 __free_old_xmit(sq, false, &stats);
1007
1008 for (i = 0; i < n; i++) {
1009 struct xdp_frame *xdpf = frames[i];
1010
1011 if (__virtnet_xdp_xmit_one(vi, sq, xdpf))
1012 break;
1013 nxmit++;
1014 }
1015 ret = nxmit;
1016
1017 if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
1018 check_sq_full_and_disable(vi, dev, sq);
1019
1020 if (flags & XDP_XMIT_FLUSH) {
1021 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
1022 kicks = 1;
1023 }
1024out:
1025 u64_stats_update_begin(&sq->stats.syncp);
1026 u64_stats_add(&sq->stats.bytes, stats.bytes);
1027 u64_stats_add(&sq->stats.packets, stats.packets);
1028 u64_stats_add(&sq->stats.xdp_tx, n);
1029 u64_stats_add(&sq->stats.xdp_tx_drops, n - nxmit);
1030 u64_stats_add(&sq->stats.kicks, kicks);
1031 u64_stats_update_end(&sq->stats.syncp);
1032
1033 virtnet_xdp_put_sq(vi, sq);
1034 return ret;
1035}
1036
1037static void put_xdp_frags(struct xdp_buff *xdp)
1038{
1039 struct skb_shared_info *shinfo;
1040 struct page *xdp_page;
1041 int i;
1042
1043 if (xdp_buff_has_frags(xdp)) {
1044 shinfo = xdp_get_shared_info_from_buff(xdp);
1045 for (i = 0; i < shinfo->nr_frags; i++) {
1046 xdp_page = skb_frag_page(&shinfo->frags[i]);
1047 put_page(xdp_page);
1048 }
1049 }
1050}
1051
1052static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
1053 struct net_device *dev,
1054 unsigned int *xdp_xmit,
1055 struct virtnet_rq_stats *stats)
1056{
1057 struct xdp_frame *xdpf;
1058 int err;
1059 u32 act;
1060
1061 act = bpf_prog_run_xdp(xdp_prog, xdp);
1062 u64_stats_inc(&stats->xdp_packets);
1063
1064 switch (act) {
1065 case XDP_PASS:
1066 return act;
1067
1068 case XDP_TX:
1069 u64_stats_inc(&stats->xdp_tx);
1070 xdpf = xdp_convert_buff_to_frame(xdp);
1071 if (unlikely(!xdpf)) {
1072 netdev_dbg(dev, "convert buff to frame failed for xdp\n");
1073 return XDP_DROP;
1074 }
1075
1076 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
1077 if (unlikely(!err)) {
1078 xdp_return_frame_rx_napi(xdpf);
1079 } else if (unlikely(err < 0)) {
1080 trace_xdp_exception(dev, xdp_prog, act);
1081 return XDP_DROP;
1082 }
1083 *xdp_xmit |= VIRTIO_XDP_TX;
1084 return act;
1085
1086 case XDP_REDIRECT:
1087 u64_stats_inc(&stats->xdp_redirects);
1088 err = xdp_do_redirect(dev, xdp, xdp_prog);
1089 if (err)
1090 return XDP_DROP;
1091
1092 *xdp_xmit |= VIRTIO_XDP_REDIR;
1093 return act;
1094
1095 default:
1096 bpf_warn_invalid_xdp_action(dev, xdp_prog, act);
1097 fallthrough;
1098 case XDP_ABORTED:
1099 trace_xdp_exception(dev, xdp_prog, act);
1100 fallthrough;
1101 case XDP_DROP:
1102 return XDP_DROP;
1103 }
1104}
1105
1106static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
1107{
1108 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0;
1109}
1110
1111/* We copy the packet for XDP in the following cases:
1112 *
1113 * 1) Packet is scattered across multiple rx buffers.
1114 * 2) Headroom space is insufficient.
1115 *
1116 * This is inefficient but it's a temporary condition that
1117 * we hit right after XDP is enabled and until queue is refilled
1118 * with large buffers with sufficient headroom - so it should affect
1119 * at most queue size packets.
1120 * Afterwards, the conditions to enable
1121 * XDP should preclude the underlying device from sending packets
1122 * across multiple buffers (num_buf > 1), and we make sure buffers
1123 * have enough headroom.
1124 */
1125static struct page *xdp_linearize_page(struct receive_queue *rq,
1126 int *num_buf,
1127 struct page *p,
1128 int offset,
1129 int page_off,
1130 unsigned int *len)
1131{
1132 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1133 struct page *page;
1134
1135 if (page_off + *len + tailroom > PAGE_SIZE)
1136 return NULL;
1137
1138 page = alloc_page(GFP_ATOMIC);
1139 if (!page)
1140 return NULL;
1141
1142 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
1143 page_off += *len;
1144
1145 while (--*num_buf) {
1146 unsigned int buflen;
1147 void *buf;
1148 int off;
1149
1150 buf = virtnet_rq_get_buf(rq, &buflen, NULL);
1151 if (unlikely(!buf))
1152 goto err_buf;
1153
1154 p = virt_to_head_page(buf);
1155 off = buf - page_address(p);
1156
1157 /* guard against a misconfigured or uncooperative backend that
1158 * is sending packet larger than the MTU.
1159 */
1160 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
1161 put_page(p);
1162 goto err_buf;
1163 }
1164
1165 memcpy(page_address(page) + page_off,
1166 page_address(p) + off, buflen);
1167 page_off += buflen;
1168 put_page(p);
1169 }
1170
1171 /* Headroom does not contribute to packet length */
1172 *len = page_off - VIRTIO_XDP_HEADROOM;
1173 return page;
1174err_buf:
1175 __free_pages(page, 0);
1176 return NULL;
1177}
1178
1179static struct sk_buff *receive_small_build_skb(struct virtnet_info *vi,
1180 unsigned int xdp_headroom,
1181 void *buf,
1182 unsigned int len)
1183{
1184 unsigned int header_offset;
1185 unsigned int headroom;
1186 unsigned int buflen;
1187 struct sk_buff *skb;
1188
1189 header_offset = VIRTNET_RX_PAD + xdp_headroom;
1190 headroom = vi->hdr_len + header_offset;
1191 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1192 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1193
1194 skb = virtnet_build_skb(buf, buflen, headroom, len);
1195 if (unlikely(!skb))
1196 return NULL;
1197
1198 buf += header_offset;
1199 memcpy(skb_vnet_common_hdr(skb), buf, vi->hdr_len);
1200
1201 return skb;
1202}
1203
1204static struct sk_buff *receive_small_xdp(struct net_device *dev,
1205 struct virtnet_info *vi,
1206 struct receive_queue *rq,
1207 struct bpf_prog *xdp_prog,
1208 void *buf,
1209 unsigned int xdp_headroom,
1210 unsigned int len,
1211 unsigned int *xdp_xmit,
1212 struct virtnet_rq_stats *stats)
1213{
1214 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
1215 unsigned int headroom = vi->hdr_len + header_offset;
1216 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
1217 struct page *page = virt_to_head_page(buf);
1218 struct page *xdp_page;
1219 unsigned int buflen;
1220 struct xdp_buff xdp;
1221 struct sk_buff *skb;
1222 unsigned int metasize = 0;
1223 u32 act;
1224
1225 if (unlikely(hdr->hdr.gso_type))
1226 goto err_xdp;
1227
1228 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1229 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1230
1231 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
1232 int offset = buf - page_address(page) + header_offset;
1233 unsigned int tlen = len + vi->hdr_len;
1234 int num_buf = 1;
1235
1236 xdp_headroom = virtnet_get_headroom(vi);
1237 header_offset = VIRTNET_RX_PAD + xdp_headroom;
1238 headroom = vi->hdr_len + header_offset;
1239 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1240 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1241 xdp_page = xdp_linearize_page(rq, &num_buf, page,
1242 offset, header_offset,
1243 &tlen);
1244 if (!xdp_page)
1245 goto err_xdp;
1246
1247 buf = page_address(xdp_page);
1248 put_page(page);
1249 page = xdp_page;
1250 }
1251
1252 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq);
1253 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len,
1254 xdp_headroom, len, true);
1255
1256 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
1257
1258 switch (act) {
1259 case XDP_PASS:
1260 /* Recalculate length in case bpf program changed it */
1261 len = xdp.data_end - xdp.data;
1262 metasize = xdp.data - xdp.data_meta;
1263 break;
1264
1265 case XDP_TX:
1266 case XDP_REDIRECT:
1267 goto xdp_xmit;
1268
1269 default:
1270 goto err_xdp;
1271 }
1272
1273 skb = virtnet_build_skb(buf, buflen, xdp.data - buf, len);
1274 if (unlikely(!skb))
1275 goto err;
1276
1277 if (metasize)
1278 skb_metadata_set(skb, metasize);
1279
1280 return skb;
1281
1282err_xdp:
1283 u64_stats_inc(&stats->xdp_drops);
1284err:
1285 u64_stats_inc(&stats->drops);
1286 put_page(page);
1287xdp_xmit:
1288 return NULL;
1289}
1290
1291static struct sk_buff *receive_small(struct net_device *dev,
1292 struct virtnet_info *vi,
1293 struct receive_queue *rq,
1294 void *buf, void *ctx,
1295 unsigned int len,
1296 unsigned int *xdp_xmit,
1297 struct virtnet_rq_stats *stats)
1298{
1299 unsigned int xdp_headroom = (unsigned long)ctx;
1300 struct page *page = virt_to_head_page(buf);
1301 struct sk_buff *skb;
1302
1303 len -= vi->hdr_len;
1304 u64_stats_add(&stats->bytes, len);
1305
1306 if (unlikely(len > GOOD_PACKET_LEN)) {
1307 pr_debug("%s: rx error: len %u exceeds max size %d\n",
1308 dev->name, len, GOOD_PACKET_LEN);
1309 DEV_STATS_INC(dev, rx_length_errors);
1310 goto err;
1311 }
1312
1313 if (unlikely(vi->xdp_enabled)) {
1314 struct bpf_prog *xdp_prog;
1315
1316 rcu_read_lock();
1317 xdp_prog = rcu_dereference(rq->xdp_prog);
1318 if (xdp_prog) {
1319 skb = receive_small_xdp(dev, vi, rq, xdp_prog, buf,
1320 xdp_headroom, len, xdp_xmit,
1321 stats);
1322 rcu_read_unlock();
1323 return skb;
1324 }
1325 rcu_read_unlock();
1326 }
1327
1328 skb = receive_small_build_skb(vi, xdp_headroom, buf, len);
1329 if (likely(skb))
1330 return skb;
1331
1332err:
1333 u64_stats_inc(&stats->drops);
1334 put_page(page);
1335 return NULL;
1336}
1337
1338static struct sk_buff *receive_big(struct net_device *dev,
1339 struct virtnet_info *vi,
1340 struct receive_queue *rq,
1341 void *buf,
1342 unsigned int len,
1343 struct virtnet_rq_stats *stats)
1344{
1345 struct page *page = buf;
1346 struct sk_buff *skb =
1347 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0);
1348
1349 u64_stats_add(&stats->bytes, len - vi->hdr_len);
1350 if (unlikely(!skb))
1351 goto err;
1352
1353 return skb;
1354
1355err:
1356 u64_stats_inc(&stats->drops);
1357 give_pages(rq, page);
1358 return NULL;
1359}
1360
1361static void mergeable_buf_free(struct receive_queue *rq, int num_buf,
1362 struct net_device *dev,
1363 struct virtnet_rq_stats *stats)
1364{
1365 struct page *page;
1366 void *buf;
1367 int len;
1368
1369 while (num_buf-- > 1) {
1370 buf = virtnet_rq_get_buf(rq, &len, NULL);
1371 if (unlikely(!buf)) {
1372 pr_debug("%s: rx error: %d buffers missing\n",
1373 dev->name, num_buf);
1374 DEV_STATS_INC(dev, rx_length_errors);
1375 break;
1376 }
1377 u64_stats_add(&stats->bytes, len);
1378 page = virt_to_head_page(buf);
1379 put_page(page);
1380 }
1381}
1382
1383/* Why not use xdp_build_skb_from_frame() ?
1384 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in
1385 * virtio-net there are 2 points that do not match its requirements:
1386 * 1. The size of the prefilled buffer is not fixed before xdp is set.
1387 * 2. xdp_build_skb_from_frame() does more checks that we don't need,
1388 * like eth_type_trans() (which virtio-net does in receive_buf()).
1389 */
1390static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev,
1391 struct virtnet_info *vi,
1392 struct xdp_buff *xdp,
1393 unsigned int xdp_frags_truesz)
1394{
1395 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
1396 unsigned int headroom, data_len;
1397 struct sk_buff *skb;
1398 int metasize;
1399 u8 nr_frags;
1400
1401 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
1402 pr_debug("Error building skb as missing reserved tailroom for xdp");
1403 return NULL;
1404 }
1405
1406 if (unlikely(xdp_buff_has_frags(xdp)))
1407 nr_frags = sinfo->nr_frags;
1408
1409 skb = build_skb(xdp->data_hard_start, xdp->frame_sz);
1410 if (unlikely(!skb))
1411 return NULL;
1412
1413 headroom = xdp->data - xdp->data_hard_start;
1414 data_len = xdp->data_end - xdp->data;
1415 skb_reserve(skb, headroom);
1416 __skb_put(skb, data_len);
1417
1418 metasize = xdp->data - xdp->data_meta;
1419 metasize = metasize > 0 ? metasize : 0;
1420 if (metasize)
1421 skb_metadata_set(skb, metasize);
1422
1423 if (unlikely(xdp_buff_has_frags(xdp)))
1424 xdp_update_skb_shared_info(skb, nr_frags,
1425 sinfo->xdp_frags_size,
1426 xdp_frags_truesz,
1427 xdp_buff_is_frag_pfmemalloc(xdp));
1428
1429 return skb;
1430}
1431
1432/* TODO: build xdp in big mode */
1433static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
1434 struct virtnet_info *vi,
1435 struct receive_queue *rq,
1436 struct xdp_buff *xdp,
1437 void *buf,
1438 unsigned int len,
1439 unsigned int frame_sz,
1440 int *num_buf,
1441 unsigned int *xdp_frags_truesize,
1442 struct virtnet_rq_stats *stats)
1443{
1444 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
1445 unsigned int headroom, tailroom, room;
1446 unsigned int truesize, cur_frag_size;
1447 struct skb_shared_info *shinfo;
1448 unsigned int xdp_frags_truesz = 0;
1449 struct page *page;
1450 skb_frag_t *frag;
1451 int offset;
1452 void *ctx;
1453
1454 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq);
1455 xdp_prepare_buff(xdp, buf - VIRTIO_XDP_HEADROOM,
1456 VIRTIO_XDP_HEADROOM + vi->hdr_len, len - vi->hdr_len, true);
1457
1458 if (!*num_buf)
1459 return 0;
1460
1461 if (*num_buf > 1) {
1462 /* If we want to build multi-buffer xdp, we need
1463 * to specify that the flags of xdp_buff have the
1464 * XDP_FLAGS_HAS_FRAG bit.
1465 */
1466 if (!xdp_buff_has_frags(xdp))
1467 xdp_buff_set_frags_flag(xdp);
1468
1469 shinfo = xdp_get_shared_info_from_buff(xdp);
1470 shinfo->nr_frags = 0;
1471 shinfo->xdp_frags_size = 0;
1472 }
1473
1474 if (*num_buf > MAX_SKB_FRAGS + 1)
1475 return -EINVAL;
1476
1477 while (--*num_buf > 0) {
1478 buf = virtnet_rq_get_buf(rq, &len, &ctx);
1479 if (unlikely(!buf)) {
1480 pr_debug("%s: rx error: %d buffers out of %d missing\n",
1481 dev->name, *num_buf,
1482 virtio16_to_cpu(vi->vdev, hdr->num_buffers));
1483 DEV_STATS_INC(dev, rx_length_errors);
1484 goto err;
1485 }
1486
1487 u64_stats_add(&stats->bytes, len);
1488 page = virt_to_head_page(buf);
1489 offset = buf - page_address(page);
1490
1491 truesize = mergeable_ctx_to_truesize(ctx);
1492 headroom = mergeable_ctx_to_headroom(ctx);
1493 tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1494 room = SKB_DATA_ALIGN(headroom + tailroom);
1495
1496 cur_frag_size = truesize;
1497 xdp_frags_truesz += cur_frag_size;
1498 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) {
1499 put_page(page);
1500 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1501 dev->name, len, (unsigned long)(truesize - room));
1502 DEV_STATS_INC(dev, rx_length_errors);
1503 goto err;
1504 }
1505
1506 frag = &shinfo->frags[shinfo->nr_frags++];
1507 skb_frag_fill_page_desc(frag, page, offset, len);
1508 if (page_is_pfmemalloc(page))
1509 xdp_buff_set_frag_pfmemalloc(xdp);
1510
1511 shinfo->xdp_frags_size += len;
1512 }
1513
1514 *xdp_frags_truesize = xdp_frags_truesz;
1515 return 0;
1516
1517err:
1518 put_xdp_frags(xdp);
1519 return -EINVAL;
1520}
1521
1522static void *mergeable_xdp_get_buf(struct virtnet_info *vi,
1523 struct receive_queue *rq,
1524 struct bpf_prog *xdp_prog,
1525 void *ctx,
1526 unsigned int *frame_sz,
1527 int *num_buf,
1528 struct page **page,
1529 int offset,
1530 unsigned int *len,
1531 struct virtio_net_hdr_mrg_rxbuf *hdr)
1532{
1533 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
1534 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
1535 struct page *xdp_page;
1536 unsigned int xdp_room;
1537
1538 /* Transient failure which in theory could occur if
1539 * in-flight packets from before XDP was enabled reach
1540 * the receive path after XDP is loaded.
1541 */
1542 if (unlikely(hdr->hdr.gso_type))
1543 return NULL;
1544
1545 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers
1546 * with headroom may add hole in truesize, which
1547 * make their length exceed PAGE_SIZE. So we disabled the
1548 * hole mechanism for xdp. See add_recvbuf_mergeable().
1549 */
1550 *frame_sz = truesize;
1551
1552 if (likely(headroom >= virtnet_get_headroom(vi) &&
1553 (*num_buf == 1 || xdp_prog->aux->xdp_has_frags))) {
1554 return page_address(*page) + offset;
1555 }
1556
1557 /* This happens when headroom is not enough because
1558 * of the buffer was prefilled before XDP is set.
1559 * This should only happen for the first several packets.
1560 * In fact, vq reset can be used here to help us clean up
1561 * the prefilled buffers, but many existing devices do not
1562 * support it, and we don't want to bother users who are
1563 * using xdp normally.
1564 */
1565 if (!xdp_prog->aux->xdp_has_frags) {
1566 /* linearize data for XDP */
1567 xdp_page = xdp_linearize_page(rq, num_buf,
1568 *page, offset,
1569 VIRTIO_XDP_HEADROOM,
1570 len);
1571 if (!xdp_page)
1572 return NULL;
1573 } else {
1574 xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM +
1575 sizeof(struct skb_shared_info));
1576 if (*len + xdp_room > PAGE_SIZE)
1577 return NULL;
1578
1579 xdp_page = alloc_page(GFP_ATOMIC);
1580 if (!xdp_page)
1581 return NULL;
1582
1583 memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM,
1584 page_address(*page) + offset, *len);
1585 }
1586
1587 *frame_sz = PAGE_SIZE;
1588
1589 put_page(*page);
1590
1591 *page = xdp_page;
1592
1593 return page_address(*page) + VIRTIO_XDP_HEADROOM;
1594}
1595
1596static struct sk_buff *receive_mergeable_xdp(struct net_device *dev,
1597 struct virtnet_info *vi,
1598 struct receive_queue *rq,
1599 struct bpf_prog *xdp_prog,
1600 void *buf,
1601 void *ctx,
1602 unsigned int len,
1603 unsigned int *xdp_xmit,
1604 struct virtnet_rq_stats *stats)
1605{
1606 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
1607 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
1608 struct page *page = virt_to_head_page(buf);
1609 int offset = buf - page_address(page);
1610 unsigned int xdp_frags_truesz = 0;
1611 struct sk_buff *head_skb;
1612 unsigned int frame_sz;
1613 struct xdp_buff xdp;
1614 void *data;
1615 u32 act;
1616 int err;
1617
1618 data = mergeable_xdp_get_buf(vi, rq, xdp_prog, ctx, &frame_sz, &num_buf, &page,
1619 offset, &len, hdr);
1620 if (unlikely(!data))
1621 goto err_xdp;
1622
1623 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
1624 &num_buf, &xdp_frags_truesz, stats);
1625 if (unlikely(err))
1626 goto err_xdp;
1627
1628 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
1629
1630 switch (act) {
1631 case XDP_PASS:
1632 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
1633 if (unlikely(!head_skb))
1634 break;
1635 return head_skb;
1636
1637 case XDP_TX:
1638 case XDP_REDIRECT:
1639 return NULL;
1640
1641 default:
1642 break;
1643 }
1644
1645 put_xdp_frags(&xdp);
1646
1647err_xdp:
1648 put_page(page);
1649 mergeable_buf_free(rq, num_buf, dev, stats);
1650
1651 u64_stats_inc(&stats->xdp_drops);
1652 u64_stats_inc(&stats->drops);
1653 return NULL;
1654}
1655
1656static struct sk_buff *receive_mergeable(struct net_device *dev,
1657 struct virtnet_info *vi,
1658 struct receive_queue *rq,
1659 void *buf,
1660 void *ctx,
1661 unsigned int len,
1662 unsigned int *xdp_xmit,
1663 struct virtnet_rq_stats *stats)
1664{
1665 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
1666 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
1667 struct page *page = virt_to_head_page(buf);
1668 int offset = buf - page_address(page);
1669 struct sk_buff *head_skb, *curr_skb;
1670 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
1671 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
1672 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1673 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1674
1675 head_skb = NULL;
1676 u64_stats_add(&stats->bytes, len - vi->hdr_len);
1677
1678 if (unlikely(len > truesize - room)) {
1679 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1680 dev->name, len, (unsigned long)(truesize - room));
1681 DEV_STATS_INC(dev, rx_length_errors);
1682 goto err_skb;
1683 }
1684
1685 if (unlikely(vi->xdp_enabled)) {
1686 struct bpf_prog *xdp_prog;
1687
1688 rcu_read_lock();
1689 xdp_prog = rcu_dereference(rq->xdp_prog);
1690 if (xdp_prog) {
1691 head_skb = receive_mergeable_xdp(dev, vi, rq, xdp_prog, buf, ctx,
1692 len, xdp_xmit, stats);
1693 rcu_read_unlock();
1694 return head_skb;
1695 }
1696 rcu_read_unlock();
1697 }
1698
1699 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);
1700 curr_skb = head_skb;
1701
1702 if (unlikely(!curr_skb))
1703 goto err_skb;
1704 while (--num_buf) {
1705 int num_skb_frags;
1706
1707 buf = virtnet_rq_get_buf(rq, &len, &ctx);
1708 if (unlikely(!buf)) {
1709 pr_debug("%s: rx error: %d buffers out of %d missing\n",
1710 dev->name, num_buf,
1711 virtio16_to_cpu(vi->vdev,
1712 hdr->num_buffers));
1713 DEV_STATS_INC(dev, rx_length_errors);
1714 goto err_buf;
1715 }
1716
1717 u64_stats_add(&stats->bytes, len);
1718 page = virt_to_head_page(buf);
1719
1720 truesize = mergeable_ctx_to_truesize(ctx);
1721 headroom = mergeable_ctx_to_headroom(ctx);
1722 tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1723 room = SKB_DATA_ALIGN(headroom + tailroom);
1724 if (unlikely(len > truesize - room)) {
1725 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1726 dev->name, len, (unsigned long)(truesize - room));
1727 DEV_STATS_INC(dev, rx_length_errors);
1728 goto err_skb;
1729 }
1730
1731 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
1732 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
1733 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
1734
1735 if (unlikely(!nskb))
1736 goto err_skb;
1737 if (curr_skb == head_skb)
1738 skb_shinfo(curr_skb)->frag_list = nskb;
1739 else
1740 curr_skb->next = nskb;
1741 curr_skb = nskb;
1742 head_skb->truesize += nskb->truesize;
1743 num_skb_frags = 0;
1744 }
1745 if (curr_skb != head_skb) {
1746 head_skb->data_len += len;
1747 head_skb->len += len;
1748 head_skb->truesize += truesize;
1749 }
1750 offset = buf - page_address(page);
1751 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
1752 put_page(page);
1753 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
1754 len, truesize);
1755 } else {
1756 skb_add_rx_frag(curr_skb, num_skb_frags, page,
1757 offset, len, truesize);
1758 }
1759 }
1760
1761 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
1762 return head_skb;
1763
1764err_skb:
1765 put_page(page);
1766 mergeable_buf_free(rq, num_buf, dev, stats);
1767
1768err_buf:
1769 u64_stats_inc(&stats->drops);
1770 dev_kfree_skb(head_skb);
1771 return NULL;
1772}
1773
1774static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
1775 struct sk_buff *skb)
1776{
1777 enum pkt_hash_types rss_hash_type;
1778
1779 if (!hdr_hash || !skb)
1780 return;
1781
1782 switch (__le16_to_cpu(hdr_hash->hash_report)) {
1783 case VIRTIO_NET_HASH_REPORT_TCPv4:
1784 case VIRTIO_NET_HASH_REPORT_UDPv4:
1785 case VIRTIO_NET_HASH_REPORT_TCPv6:
1786 case VIRTIO_NET_HASH_REPORT_UDPv6:
1787 case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
1788 case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
1789 rss_hash_type = PKT_HASH_TYPE_L4;
1790 break;
1791 case VIRTIO_NET_HASH_REPORT_IPv4:
1792 case VIRTIO_NET_HASH_REPORT_IPv6:
1793 case VIRTIO_NET_HASH_REPORT_IPv6_EX:
1794 rss_hash_type = PKT_HASH_TYPE_L3;
1795 break;
1796 case VIRTIO_NET_HASH_REPORT_NONE:
1797 default:
1798 rss_hash_type = PKT_HASH_TYPE_NONE;
1799 }
1800 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type);
1801}
1802
1803static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
1804 void *buf, unsigned int len, void **ctx,
1805 unsigned int *xdp_xmit,
1806 struct virtnet_rq_stats *stats)
1807{
1808 struct net_device *dev = vi->dev;
1809 struct sk_buff *skb;
1810 struct virtio_net_common_hdr *hdr;
1811
1812 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
1813 pr_debug("%s: short packet %i\n", dev->name, len);
1814 DEV_STATS_INC(dev, rx_length_errors);
1815 virtnet_rq_free_buf(vi, rq, buf);
1816 return;
1817 }
1818
1819 if (vi->mergeable_rx_bufs)
1820 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
1821 stats);
1822 else if (vi->big_packets)
1823 skb = receive_big(dev, vi, rq, buf, len, stats);
1824 else
1825 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
1826
1827 if (unlikely(!skb))
1828 return;
1829
1830 hdr = skb_vnet_common_hdr(skb);
1831 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report)
1832 virtio_skb_set_hash(&hdr->hash_v1_hdr, skb);
1833
1834 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
1835 skb->ip_summed = CHECKSUM_UNNECESSARY;
1836
1837 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
1838 virtio_is_little_endian(vi->vdev))) {
1839 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
1840 dev->name, hdr->hdr.gso_type,
1841 hdr->hdr.gso_size);
1842 goto frame_err;
1843 }
1844
1845 skb_record_rx_queue(skb, vq2rxq(rq->vq));
1846 skb->protocol = eth_type_trans(skb, dev);
1847 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
1848 ntohs(skb->protocol), skb->len, skb->pkt_type);
1849
1850 napi_gro_receive(&rq->napi, skb);
1851 return;
1852
1853frame_err:
1854 DEV_STATS_INC(dev, rx_frame_errors);
1855 dev_kfree_skb(skb);
1856}
1857
1858/* Unlike mergeable buffers, all buffers are allocated to the
1859 * same size, except for the headroom. For this reason we do
1860 * not need to use mergeable_len_to_ctx here - it is enough
1861 * to store the headroom as the context ignoring the truesize.
1862 */
1863static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1864 gfp_t gfp)
1865{
1866 char *buf;
1867 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1868 void *ctx = (void *)(unsigned long)xdp_headroom;
1869 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1870 int err;
1871
1872 len = SKB_DATA_ALIGN(len) +
1873 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1874
1875 buf = virtnet_rq_alloc(rq, len, gfp);
1876 if (unlikely(!buf))
1877 return -ENOMEM;
1878
1879 virtnet_rq_init_one_sg(rq, buf + VIRTNET_RX_PAD + xdp_headroom,
1880 vi->hdr_len + GOOD_PACKET_LEN);
1881
1882 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1883 if (err < 0) {
1884 if (rq->do_dma)
1885 virtnet_rq_unmap(rq, buf, 0);
1886 put_page(virt_to_head_page(buf));
1887 }
1888
1889 return err;
1890}
1891
1892static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1893 gfp_t gfp)
1894{
1895 struct page *first, *list = NULL;
1896 char *p;
1897 int i, err, offset;
1898
1899 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2);
1900
1901 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */
1902 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) {
1903 first = get_a_page(rq, gfp);
1904 if (!first) {
1905 if (list)
1906 give_pages(rq, list);
1907 return -ENOMEM;
1908 }
1909 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1910
1911 /* chain new page in list head to match sg */
1912 first->private = (unsigned long)list;
1913 list = first;
1914 }
1915
1916 first = get_a_page(rq, gfp);
1917 if (!first) {
1918 give_pages(rq, list);
1919 return -ENOMEM;
1920 }
1921 p = page_address(first);
1922
1923 /* rq->sg[0], rq->sg[1] share the same page */
1924 /* a separated rq->sg[0] for header - required in case !any_header_sg */
1925 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1926
1927 /* rq->sg[1] for data packet, from offset */
1928 offset = sizeof(struct padded_vnet_hdr);
1929 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1930
1931 /* chain first in list head */
1932 first->private = (unsigned long)list;
1933 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2,
1934 first, gfp);
1935 if (err < 0)
1936 give_pages(rq, first);
1937
1938 return err;
1939}
1940
1941static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1942 struct ewma_pkt_len *avg_pkt_len,
1943 unsigned int room)
1944{
1945 struct virtnet_info *vi = rq->vq->vdev->priv;
1946 const size_t hdr_len = vi->hdr_len;
1947 unsigned int len;
1948
1949 if (room)
1950 return PAGE_SIZE - room;
1951
1952 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1953 rq->min_buf_len, PAGE_SIZE - hdr_len);
1954
1955 return ALIGN(len, L1_CACHE_BYTES);
1956}
1957
1958static int add_recvbuf_mergeable(struct virtnet_info *vi,
1959 struct receive_queue *rq, gfp_t gfp)
1960{
1961 struct page_frag *alloc_frag = &rq->alloc_frag;
1962 unsigned int headroom = virtnet_get_headroom(vi);
1963 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1964 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1965 unsigned int len, hole;
1966 void *ctx;
1967 char *buf;
1968 int err;
1969
1970 /* Extra tailroom is needed to satisfy XDP's assumption. This
1971 * means rx frags coalescing won't work, but consider we've
1972 * disabled GSO for XDP, it won't be a big issue.
1973 */
1974 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1975
1976 buf = virtnet_rq_alloc(rq, len + room, gfp);
1977 if (unlikely(!buf))
1978 return -ENOMEM;
1979
1980 buf += headroom; /* advance address leaving hole at front of pkt */
1981 hole = alloc_frag->size - alloc_frag->offset;
1982 if (hole < len + room) {
1983 /* To avoid internal fragmentation, if there is very likely not
1984 * enough space for another buffer, add the remaining space to
1985 * the current buffer.
1986 * XDP core assumes that frame_size of xdp_buff and the length
1987 * of the frag are PAGE_SIZE, so we disable the hole mechanism.
1988 */
1989 if (!headroom)
1990 len += hole;
1991 alloc_frag->offset += hole;
1992 }
1993
1994 virtnet_rq_init_one_sg(rq, buf, len);
1995
1996 ctx = mergeable_len_to_ctx(len + room, headroom);
1997 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1998 if (err < 0) {
1999 if (rq->do_dma)
2000 virtnet_rq_unmap(rq, buf, 0);
2001 put_page(virt_to_head_page(buf));
2002 }
2003
2004 return err;
2005}
2006
2007/*
2008 * Returns false if we couldn't fill entirely (OOM).
2009 *
2010 * Normally run in the receive path, but can also be run from ndo_open
2011 * before we're receiving packets, or from refill_work which is
2012 * careful to disable receiving (using napi_disable).
2013 */
2014static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
2015 gfp_t gfp)
2016{
2017 int err;
2018 bool oom;
2019
2020 do {
2021 if (vi->mergeable_rx_bufs)
2022 err = add_recvbuf_mergeable(vi, rq, gfp);
2023 else if (vi->big_packets)
2024 err = add_recvbuf_big(vi, rq, gfp);
2025 else
2026 err = add_recvbuf_small(vi, rq, gfp);
2027
2028 oom = err == -ENOMEM;
2029 if (err)
2030 break;
2031 } while (rq->vq->num_free);
2032 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
2033 unsigned long flags;
2034
2035 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
2036 u64_stats_inc(&rq->stats.kicks);
2037 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
2038 }
2039
2040 return !oom;
2041}
2042
2043static void skb_recv_done(struct virtqueue *rvq)
2044{
2045 struct virtnet_info *vi = rvq->vdev->priv;
2046 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
2047
2048 rq->calls++;
2049 virtqueue_napi_schedule(&rq->napi, rvq);
2050}
2051
2052static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
2053{
2054 napi_enable(napi);
2055
2056 /* If all buffers were filled by other side before we napi_enabled, we
2057 * won't get another interrupt, so process any outstanding packets now.
2058 * Call local_bh_enable after to trigger softIRQ processing.
2059 */
2060 local_bh_disable();
2061 virtqueue_napi_schedule(napi, vq);
2062 local_bh_enable();
2063}
2064
2065static void virtnet_napi_tx_enable(struct virtnet_info *vi,
2066 struct virtqueue *vq,
2067 struct napi_struct *napi)
2068{
2069 if (!napi->weight)
2070 return;
2071
2072 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
2073 * enable the feature if this is likely affine with the transmit path.
2074 */
2075 if (!vi->affinity_hint_set) {
2076 napi->weight = 0;
2077 return;
2078 }
2079
2080 return virtnet_napi_enable(vq, napi);
2081}
2082
2083static void virtnet_napi_tx_disable(struct napi_struct *napi)
2084{
2085 if (napi->weight)
2086 napi_disable(napi);
2087}
2088
2089static void refill_work(struct work_struct *work)
2090{
2091 struct virtnet_info *vi =
2092 container_of(work, struct virtnet_info, refill.work);
2093 bool still_empty;
2094 int i;
2095
2096 for (i = 0; i < vi->curr_queue_pairs; i++) {
2097 struct receive_queue *rq = &vi->rq[i];
2098
2099 napi_disable(&rq->napi);
2100 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
2101 virtnet_napi_enable(rq->vq, &rq->napi);
2102
2103 /* In theory, this can happen: if we don't get any buffers in
2104 * we will *never* try to fill again.
2105 */
2106 if (still_empty)
2107 schedule_delayed_work(&vi->refill, HZ/2);
2108 }
2109}
2110
2111static int virtnet_receive(struct receive_queue *rq, int budget,
2112 unsigned int *xdp_xmit)
2113{
2114 struct virtnet_info *vi = rq->vq->vdev->priv;
2115 struct virtnet_rq_stats stats = {};
2116 unsigned int len;
2117 int packets = 0;
2118 void *buf;
2119 int i;
2120
2121 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2122 void *ctx;
2123
2124 while (packets < budget &&
2125 (buf = virtnet_rq_get_buf(rq, &len, &ctx))) {
2126 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
2127 packets++;
2128 }
2129 } else {
2130 while (packets < budget &&
2131 (buf = virtnet_rq_get_buf(rq, &len, NULL)) != NULL) {
2132 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
2133 packets++;
2134 }
2135 }
2136
2137 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
2138 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) {
2139 spin_lock(&vi->refill_lock);
2140 if (vi->refill_enabled)
2141 schedule_delayed_work(&vi->refill, 0);
2142 spin_unlock(&vi->refill_lock);
2143 }
2144 }
2145
2146 u64_stats_set(&stats.packets, packets);
2147 u64_stats_update_begin(&rq->stats.syncp);
2148 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
2149 size_t offset = virtnet_rq_stats_desc[i].offset;
2150 u64_stats_t *item, *src;
2151
2152 item = (u64_stats_t *)((u8 *)&rq->stats + offset);
2153 src = (u64_stats_t *)((u8 *)&stats + offset);
2154 u64_stats_add(item, u64_stats_read(src));
2155 }
2156 u64_stats_update_end(&rq->stats.syncp);
2157
2158 return packets;
2159}
2160
2161static void virtnet_poll_cleantx(struct receive_queue *rq)
2162{
2163 struct virtnet_info *vi = rq->vq->vdev->priv;
2164 unsigned int index = vq2rxq(rq->vq);
2165 struct send_queue *sq = &vi->sq[index];
2166 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
2167
2168 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
2169 return;
2170
2171 if (__netif_tx_trylock(txq)) {
2172 if (sq->reset) {
2173 __netif_tx_unlock(txq);
2174 return;
2175 }
2176
2177 do {
2178 virtqueue_disable_cb(sq->vq);
2179 free_old_xmit(sq, true);
2180 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
2181
2182 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
2183 netif_tx_wake_queue(txq);
2184
2185 __netif_tx_unlock(txq);
2186 }
2187}
2188
2189static void virtnet_rx_dim_update(struct virtnet_info *vi, struct receive_queue *rq)
2190{
2191 struct dim_sample cur_sample = {};
2192
2193 if (!rq->packets_in_napi)
2194 return;
2195
2196 u64_stats_update_begin(&rq->stats.syncp);
2197 dim_update_sample(rq->calls,
2198 u64_stats_read(&rq->stats.packets),
2199 u64_stats_read(&rq->stats.bytes),
2200 &cur_sample);
2201 u64_stats_update_end(&rq->stats.syncp);
2202
2203 net_dim(&rq->dim, cur_sample);
2204 rq->packets_in_napi = 0;
2205}
2206
2207static int virtnet_poll(struct napi_struct *napi, int budget)
2208{
2209 struct receive_queue *rq =
2210 container_of(napi, struct receive_queue, napi);
2211 struct virtnet_info *vi = rq->vq->vdev->priv;
2212 struct send_queue *sq;
2213 unsigned int received;
2214 unsigned int xdp_xmit = 0;
2215 bool napi_complete;
2216
2217 virtnet_poll_cleantx(rq);
2218
2219 received = virtnet_receive(rq, budget, &xdp_xmit);
2220 rq->packets_in_napi += received;
2221
2222 if (xdp_xmit & VIRTIO_XDP_REDIR)
2223 xdp_do_flush();
2224
2225 /* Out of packets? */
2226 if (received < budget) {
2227 napi_complete = virtqueue_napi_complete(napi, rq->vq, received);
2228 if (napi_complete && rq->dim_enabled)
2229 virtnet_rx_dim_update(vi, rq);
2230 }
2231
2232 if (xdp_xmit & VIRTIO_XDP_TX) {
2233 sq = virtnet_xdp_get_sq(vi);
2234 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
2235 u64_stats_update_begin(&sq->stats.syncp);
2236 u64_stats_inc(&sq->stats.kicks);
2237 u64_stats_update_end(&sq->stats.syncp);
2238 }
2239 virtnet_xdp_put_sq(vi, sq);
2240 }
2241
2242 return received;
2243}
2244
2245static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
2246{
2247 virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
2248 napi_disable(&vi->rq[qp_index].napi);
2249 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
2250}
2251
2252static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
2253{
2254 struct net_device *dev = vi->dev;
2255 int err;
2256
2257 err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
2258 vi->rq[qp_index].napi.napi_id);
2259 if (err < 0)
2260 return err;
2261
2262 err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
2263 MEM_TYPE_PAGE_SHARED, NULL);
2264 if (err < 0)
2265 goto err_xdp_reg_mem_model;
2266
2267 virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
2268 virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
2269
2270 return 0;
2271
2272err_xdp_reg_mem_model:
2273 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
2274 return err;
2275}
2276
2277static int virtnet_open(struct net_device *dev)
2278{
2279 struct virtnet_info *vi = netdev_priv(dev);
2280 int i, err;
2281
2282 enable_delayed_refill(vi);
2283
2284 for (i = 0; i < vi->max_queue_pairs; i++) {
2285 if (i < vi->curr_queue_pairs)
2286 /* Make sure we have some buffers: if oom use wq. */
2287 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2288 schedule_delayed_work(&vi->refill, 0);
2289
2290 err = virtnet_enable_queue_pair(vi, i);
2291 if (err < 0)
2292 goto err_enable_qp;
2293 }
2294
2295 return 0;
2296
2297err_enable_qp:
2298 disable_delayed_refill(vi);
2299 cancel_delayed_work_sync(&vi->refill);
2300
2301 for (i--; i >= 0; i--) {
2302 virtnet_disable_queue_pair(vi, i);
2303 cancel_work_sync(&vi->rq[i].dim.work);
2304 }
2305
2306 return err;
2307}
2308
2309static int virtnet_poll_tx(struct napi_struct *napi, int budget)
2310{
2311 struct send_queue *sq = container_of(napi, struct send_queue, napi);
2312 struct virtnet_info *vi = sq->vq->vdev->priv;
2313 unsigned int index = vq2txq(sq->vq);
2314 struct netdev_queue *txq;
2315 int opaque;
2316 bool done;
2317
2318 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
2319 /* We don't need to enable cb for XDP */
2320 napi_complete_done(napi, 0);
2321 return 0;
2322 }
2323
2324 txq = netdev_get_tx_queue(vi->dev, index);
2325 __netif_tx_lock(txq, raw_smp_processor_id());
2326 virtqueue_disable_cb(sq->vq);
2327 free_old_xmit(sq, true);
2328
2329 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
2330 netif_tx_wake_queue(txq);
2331
2332 opaque = virtqueue_enable_cb_prepare(sq->vq);
2333
2334 done = napi_complete_done(napi, 0);
2335
2336 if (!done)
2337 virtqueue_disable_cb(sq->vq);
2338
2339 __netif_tx_unlock(txq);
2340
2341 if (done) {
2342 if (unlikely(virtqueue_poll(sq->vq, opaque))) {
2343 if (napi_schedule_prep(napi)) {
2344 __netif_tx_lock(txq, raw_smp_processor_id());
2345 virtqueue_disable_cb(sq->vq);
2346 __netif_tx_unlock(txq);
2347 __napi_schedule(napi);
2348 }
2349 }
2350 }
2351
2352 return 0;
2353}
2354
2355static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
2356{
2357 struct virtio_net_hdr_mrg_rxbuf *hdr;
2358 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
2359 struct virtnet_info *vi = sq->vq->vdev->priv;
2360 int num_sg;
2361 unsigned hdr_len = vi->hdr_len;
2362 bool can_push;
2363
2364 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
2365
2366 can_push = vi->any_header_sg &&
2367 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
2368 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
2369 /* Even if we can, don't push here yet as this would skew
2370 * csum_start offset below. */
2371 if (can_push)
2372 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
2373 else
2374 hdr = &skb_vnet_common_hdr(skb)->mrg_hdr;
2375
2376 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
2377 virtio_is_little_endian(vi->vdev), false,
2378 0))
2379 return -EPROTO;
2380
2381 if (vi->mergeable_rx_bufs)
2382 hdr->num_buffers = 0;
2383
2384 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
2385 if (can_push) {
2386 __skb_push(skb, hdr_len);
2387 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
2388 if (unlikely(num_sg < 0))
2389 return num_sg;
2390 /* Pull header back to avoid skew in tx bytes calculations. */
2391 __skb_pull(skb, hdr_len);
2392 } else {
2393 sg_set_buf(sq->sg, hdr, hdr_len);
2394 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
2395 if (unlikely(num_sg < 0))
2396 return num_sg;
2397 num_sg++;
2398 }
2399 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
2400}
2401
2402static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
2403{
2404 struct virtnet_info *vi = netdev_priv(dev);
2405 int qnum = skb_get_queue_mapping(skb);
2406 struct send_queue *sq = &vi->sq[qnum];
2407 int err;
2408 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
2409 bool kick = !netdev_xmit_more();
2410 bool use_napi = sq->napi.weight;
2411
2412 /* Free up any pending old buffers before queueing new ones. */
2413 do {
2414 if (use_napi)
2415 virtqueue_disable_cb(sq->vq);
2416
2417 free_old_xmit(sq, false);
2418
2419 } while (use_napi && kick &&
2420 unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
2421
2422 /* timestamp packet in software */
2423 skb_tx_timestamp(skb);
2424
2425 /* Try to transmit */
2426 err = xmit_skb(sq, skb);
2427
2428 /* This should not happen! */
2429 if (unlikely(err)) {
2430 DEV_STATS_INC(dev, tx_fifo_errors);
2431 if (net_ratelimit())
2432 dev_warn(&dev->dev,
2433 "Unexpected TXQ (%d) queue failure: %d\n",
2434 qnum, err);
2435 DEV_STATS_INC(dev, tx_dropped);
2436 dev_kfree_skb_any(skb);
2437 return NETDEV_TX_OK;
2438 }
2439
2440 /* Don't wait up for transmitted skbs to be freed. */
2441 if (!use_napi) {
2442 skb_orphan(skb);
2443 nf_reset_ct(skb);
2444 }
2445
2446 check_sq_full_and_disable(vi, dev, sq);
2447
2448 if (kick || netif_xmit_stopped(txq)) {
2449 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
2450 u64_stats_update_begin(&sq->stats.syncp);
2451 u64_stats_inc(&sq->stats.kicks);
2452 u64_stats_update_end(&sq->stats.syncp);
2453 }
2454 }
2455
2456 return NETDEV_TX_OK;
2457}
2458
2459static int virtnet_rx_resize(struct virtnet_info *vi,
2460 struct receive_queue *rq, u32 ring_num)
2461{
2462 bool running = netif_running(vi->dev);
2463 int err, qindex;
2464
2465 qindex = rq - vi->rq;
2466
2467 if (running) {
2468 napi_disable(&rq->napi);
2469 cancel_work_sync(&rq->dim.work);
2470 }
2471
2472 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_unmap_free_buf);
2473 if (err)
2474 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
2475
2476 if (!try_fill_recv(vi, rq, GFP_KERNEL))
2477 schedule_delayed_work(&vi->refill, 0);
2478
2479 if (running)
2480 virtnet_napi_enable(rq->vq, &rq->napi);
2481 return err;
2482}
2483
2484static int virtnet_tx_resize(struct virtnet_info *vi,
2485 struct send_queue *sq, u32 ring_num)
2486{
2487 bool running = netif_running(vi->dev);
2488 struct netdev_queue *txq;
2489 int err, qindex;
2490
2491 qindex = sq - vi->sq;
2492
2493 if (running)
2494 virtnet_napi_tx_disable(&sq->napi);
2495
2496 txq = netdev_get_tx_queue(vi->dev, qindex);
2497
2498 /* 1. wait all ximt complete
2499 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue()
2500 */
2501 __netif_tx_lock_bh(txq);
2502
2503 /* Prevent rx poll from accessing sq. */
2504 sq->reset = true;
2505
2506 /* Prevent the upper layer from trying to send packets. */
2507 netif_stop_subqueue(vi->dev, qindex);
2508
2509 __netif_tx_unlock_bh(txq);
2510
2511 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
2512 if (err)
2513 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
2514
2515 __netif_tx_lock_bh(txq);
2516 sq->reset = false;
2517 netif_tx_wake_queue(txq);
2518 __netif_tx_unlock_bh(txq);
2519
2520 if (running)
2521 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi);
2522 return err;
2523}
2524
2525/*
2526 * Send command via the control virtqueue and check status. Commands
2527 * supported by the hypervisor, as indicated by feature bits, should
2528 * never fail unless improperly formatted.
2529 */
2530static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
2531 struct scatterlist *out)
2532{
2533 struct scatterlist *sgs[4], hdr, stat;
2534 unsigned out_num = 0, tmp;
2535 int ret;
2536
2537 /* Caller should know better */
2538 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
2539
2540 vi->ctrl->status = ~0;
2541 vi->ctrl->hdr.class = class;
2542 vi->ctrl->hdr.cmd = cmd;
2543 /* Add header */
2544 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
2545 sgs[out_num++] = &hdr;
2546
2547 if (out)
2548 sgs[out_num++] = out;
2549
2550 /* Add return status. */
2551 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
2552 sgs[out_num] = &stat;
2553
2554 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
2555 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
2556 if (ret < 0) {
2557 dev_warn(&vi->vdev->dev,
2558 "Failed to add sgs for command vq: %d\n.", ret);
2559 return false;
2560 }
2561
2562 if (unlikely(!virtqueue_kick(vi->cvq)))
2563 return vi->ctrl->status == VIRTIO_NET_OK;
2564
2565 /* Spin for a response, the kick causes an ioport write, trapping
2566 * into the hypervisor, so the request should be handled immediately.
2567 */
2568 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
2569 !virtqueue_is_broken(vi->cvq)) {
2570 cond_resched();
2571 cpu_relax();
2572 }
2573
2574 return vi->ctrl->status == VIRTIO_NET_OK;
2575}
2576
2577static int virtnet_set_mac_address(struct net_device *dev, void *p)
2578{
2579 struct virtnet_info *vi = netdev_priv(dev);
2580 struct virtio_device *vdev = vi->vdev;
2581 int ret;
2582 struct sockaddr *addr;
2583 struct scatterlist sg;
2584
2585 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2586 return -EOPNOTSUPP;
2587
2588 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
2589 if (!addr)
2590 return -ENOMEM;
2591
2592 ret = eth_prepare_mac_addr_change(dev, addr);
2593 if (ret)
2594 goto out;
2595
2596 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
2597 sg_init_one(&sg, addr->sa_data, dev->addr_len);
2598 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
2599 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
2600 dev_warn(&vdev->dev,
2601 "Failed to set mac address by vq command.\n");
2602 ret = -EINVAL;
2603 goto out;
2604 }
2605 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
2606 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
2607 unsigned int i;
2608
2609 /* Naturally, this has an atomicity problem. */
2610 for (i = 0; i < dev->addr_len; i++)
2611 virtio_cwrite8(vdev,
2612 offsetof(struct virtio_net_config, mac) +
2613 i, addr->sa_data[i]);
2614 }
2615
2616 eth_commit_mac_addr_change(dev, p);
2617 ret = 0;
2618
2619out:
2620 kfree(addr);
2621 return ret;
2622}
2623
2624static void virtnet_stats(struct net_device *dev,
2625 struct rtnl_link_stats64 *tot)
2626{
2627 struct virtnet_info *vi = netdev_priv(dev);
2628 unsigned int start;
2629 int i;
2630
2631 for (i = 0; i < vi->max_queue_pairs; i++) {
2632 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops;
2633 struct receive_queue *rq = &vi->rq[i];
2634 struct send_queue *sq = &vi->sq[i];
2635
2636 do {
2637 start = u64_stats_fetch_begin(&sq->stats.syncp);
2638 tpackets = u64_stats_read(&sq->stats.packets);
2639 tbytes = u64_stats_read(&sq->stats.bytes);
2640 terrors = u64_stats_read(&sq->stats.tx_timeouts);
2641 } while (u64_stats_fetch_retry(&sq->stats.syncp, start));
2642
2643 do {
2644 start = u64_stats_fetch_begin(&rq->stats.syncp);
2645 rpackets = u64_stats_read(&rq->stats.packets);
2646 rbytes = u64_stats_read(&rq->stats.bytes);
2647 rdrops = u64_stats_read(&rq->stats.drops);
2648 } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
2649
2650 tot->rx_packets += rpackets;
2651 tot->tx_packets += tpackets;
2652 tot->rx_bytes += rbytes;
2653 tot->tx_bytes += tbytes;
2654 tot->rx_dropped += rdrops;
2655 tot->tx_errors += terrors;
2656 }
2657
2658 tot->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
2659 tot->tx_fifo_errors = DEV_STATS_READ(dev, tx_fifo_errors);
2660 tot->rx_length_errors = DEV_STATS_READ(dev, rx_length_errors);
2661 tot->rx_frame_errors = DEV_STATS_READ(dev, rx_frame_errors);
2662}
2663
2664static void virtnet_ack_link_announce(struct virtnet_info *vi)
2665{
2666 rtnl_lock();
2667 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
2668 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
2669 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
2670 rtnl_unlock();
2671}
2672
2673static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
2674{
2675 struct scatterlist sg;
2676 struct net_device *dev = vi->dev;
2677
2678 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
2679 return 0;
2680
2681 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
2682 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
2683
2684 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
2685 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
2686 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
2687 queue_pairs);
2688 return -EINVAL;
2689 } else {
2690 vi->curr_queue_pairs = queue_pairs;
2691 /* virtnet_open() will refill when device is going to up. */
2692 if (dev->flags & IFF_UP)
2693 schedule_delayed_work(&vi->refill, 0);
2694 }
2695
2696 return 0;
2697}
2698
2699static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
2700{
2701 int err;
2702
2703 rtnl_lock();
2704 err = _virtnet_set_queues(vi, queue_pairs);
2705 rtnl_unlock();
2706 return err;
2707}
2708
2709static int virtnet_close(struct net_device *dev)
2710{
2711 struct virtnet_info *vi = netdev_priv(dev);
2712 int i;
2713
2714 /* Make sure NAPI doesn't schedule refill work */
2715 disable_delayed_refill(vi);
2716 /* Make sure refill_work doesn't re-enable napi! */
2717 cancel_delayed_work_sync(&vi->refill);
2718
2719 for (i = 0; i < vi->max_queue_pairs; i++) {
2720 virtnet_disable_queue_pair(vi, i);
2721 cancel_work_sync(&vi->rq[i].dim.work);
2722 }
2723
2724 return 0;
2725}
2726
2727static void virtnet_rx_mode_work(struct work_struct *work)
2728{
2729 struct virtnet_info *vi =
2730 container_of(work, struct virtnet_info, rx_mode_work);
2731 struct net_device *dev = vi->dev;
2732 struct scatterlist sg[2];
2733 struct virtio_net_ctrl_mac *mac_data;
2734 struct netdev_hw_addr *ha;
2735 int uc_count;
2736 int mc_count;
2737 void *buf;
2738 int i;
2739
2740 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
2741 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
2742 return;
2743
2744 rtnl_lock();
2745
2746 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
2747 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
2748
2749 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
2750
2751 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
2752 VIRTIO_NET_CTRL_RX_PROMISC, sg))
2753 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
2754 vi->ctrl->promisc ? "en" : "dis");
2755
2756 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
2757
2758 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
2759 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
2760 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
2761 vi->ctrl->allmulti ? "en" : "dis");
2762
2763 netif_addr_lock_bh(dev);
2764
2765 uc_count = netdev_uc_count(dev);
2766 mc_count = netdev_mc_count(dev);
2767 /* MAC filter - use one buffer for both lists */
2768 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
2769 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
2770 mac_data = buf;
2771 if (!buf) {
2772 netif_addr_unlock_bh(dev);
2773 rtnl_unlock();
2774 return;
2775 }
2776
2777 sg_init_table(sg, 2);
2778
2779 /* Store the unicast list and count in the front of the buffer */
2780 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
2781 i = 0;
2782 netdev_for_each_uc_addr(ha, dev)
2783 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
2784
2785 sg_set_buf(&sg[0], mac_data,
2786 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
2787
2788 /* multicast list and count fill the end */
2789 mac_data = (void *)&mac_data->macs[uc_count][0];
2790
2791 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
2792 i = 0;
2793 netdev_for_each_mc_addr(ha, dev)
2794 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
2795
2796 netif_addr_unlock_bh(dev);
2797
2798 sg_set_buf(&sg[1], mac_data,
2799 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
2800
2801 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
2802 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
2803 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
2804
2805 rtnl_unlock();
2806
2807 kfree(buf);
2808}
2809
2810static void virtnet_set_rx_mode(struct net_device *dev)
2811{
2812 struct virtnet_info *vi = netdev_priv(dev);
2813
2814 if (vi->rx_mode_work_enabled)
2815 schedule_work(&vi->rx_mode_work);
2816}
2817
2818static int virtnet_vlan_rx_add_vid(struct net_device *dev,
2819 __be16 proto, u16 vid)
2820{
2821 struct virtnet_info *vi = netdev_priv(dev);
2822 struct scatterlist sg;
2823
2824 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
2825 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
2826
2827 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
2828 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
2829 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
2830 return 0;
2831}
2832
2833static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
2834 __be16 proto, u16 vid)
2835{
2836 struct virtnet_info *vi = netdev_priv(dev);
2837 struct scatterlist sg;
2838
2839 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
2840 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
2841
2842 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
2843 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
2844 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
2845 return 0;
2846}
2847
2848static void virtnet_clean_affinity(struct virtnet_info *vi)
2849{
2850 int i;
2851
2852 if (vi->affinity_hint_set) {
2853 for (i = 0; i < vi->max_queue_pairs; i++) {
2854 virtqueue_set_affinity(vi->rq[i].vq, NULL);
2855 virtqueue_set_affinity(vi->sq[i].vq, NULL);
2856 }
2857
2858 vi->affinity_hint_set = false;
2859 }
2860}
2861
2862static void virtnet_set_affinity(struct virtnet_info *vi)
2863{
2864 cpumask_var_t mask;
2865 int stragglers;
2866 int group_size;
2867 int i, j, cpu;
2868 int num_cpu;
2869 int stride;
2870
2871 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
2872 virtnet_clean_affinity(vi);
2873 return;
2874 }
2875
2876 num_cpu = num_online_cpus();
2877 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
2878 stragglers = num_cpu >= vi->curr_queue_pairs ?
2879 num_cpu % vi->curr_queue_pairs :
2880 0;
2881 cpu = cpumask_first(cpu_online_mask);
2882
2883 for (i = 0; i < vi->curr_queue_pairs; i++) {
2884 group_size = stride + (i < stragglers ? 1 : 0);
2885
2886 for (j = 0; j < group_size; j++) {
2887 cpumask_set_cpu(cpu, mask);
2888 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
2889 nr_cpu_ids, false);
2890 }
2891 virtqueue_set_affinity(vi->rq[i].vq, mask);
2892 virtqueue_set_affinity(vi->sq[i].vq, mask);
2893 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS);
2894 cpumask_clear(mask);
2895 }
2896
2897 vi->affinity_hint_set = true;
2898 free_cpumask_var(mask);
2899}
2900
2901static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
2902{
2903 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2904 node);
2905 virtnet_set_affinity(vi);
2906 return 0;
2907}
2908
2909static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
2910{
2911 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2912 node_dead);
2913 virtnet_set_affinity(vi);
2914 return 0;
2915}
2916
2917static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
2918{
2919 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2920 node);
2921
2922 virtnet_clean_affinity(vi);
2923 return 0;
2924}
2925
2926static enum cpuhp_state virtionet_online;
2927
2928static int virtnet_cpu_notif_add(struct virtnet_info *vi)
2929{
2930 int ret;
2931
2932 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
2933 if (ret)
2934 return ret;
2935 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2936 &vi->node_dead);
2937 if (!ret)
2938 return ret;
2939 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2940 return ret;
2941}
2942
2943static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
2944{
2945 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2946 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2947 &vi->node_dead);
2948}
2949
2950static int virtnet_send_ctrl_coal_vq_cmd(struct virtnet_info *vi,
2951 u16 vqn, u32 max_usecs, u32 max_packets)
2952{
2953 struct scatterlist sgs;
2954
2955 vi->ctrl->coal_vq.vqn = cpu_to_le16(vqn);
2956 vi->ctrl->coal_vq.coal.max_usecs = cpu_to_le32(max_usecs);
2957 vi->ctrl->coal_vq.coal.max_packets = cpu_to_le32(max_packets);
2958 sg_init_one(&sgs, &vi->ctrl->coal_vq, sizeof(vi->ctrl->coal_vq));
2959
2960 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
2961 VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET,
2962 &sgs))
2963 return -EINVAL;
2964
2965 return 0;
2966}
2967
2968static int virtnet_send_rx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
2969 u16 queue, u32 max_usecs,
2970 u32 max_packets)
2971{
2972 int err;
2973
2974 err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
2975 max_usecs, max_packets);
2976 if (err)
2977 return err;
2978
2979 vi->rq[queue].intr_coal.max_usecs = max_usecs;
2980 vi->rq[queue].intr_coal.max_packets = max_packets;
2981
2982 return 0;
2983}
2984
2985static int virtnet_send_tx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
2986 u16 queue, u32 max_usecs,
2987 u32 max_packets)
2988{
2989 int err;
2990
2991 err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
2992 max_usecs, max_packets);
2993 if (err)
2994 return err;
2995
2996 vi->sq[queue].intr_coal.max_usecs = max_usecs;
2997 vi->sq[queue].intr_coal.max_packets = max_packets;
2998
2999 return 0;
3000}
3001
3002static void virtnet_get_ringparam(struct net_device *dev,
3003 struct ethtool_ringparam *ring,
3004 struct kernel_ethtool_ringparam *kernel_ring,
3005 struct netlink_ext_ack *extack)
3006{
3007 struct virtnet_info *vi = netdev_priv(dev);
3008
3009 ring->rx_max_pending = vi->rq[0].vq->num_max;
3010 ring->tx_max_pending = vi->sq[0].vq->num_max;
3011 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
3012 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
3013}
3014
3015static int virtnet_set_ringparam(struct net_device *dev,
3016 struct ethtool_ringparam *ring,
3017 struct kernel_ethtool_ringparam *kernel_ring,
3018 struct netlink_ext_ack *extack)
3019{
3020 struct virtnet_info *vi = netdev_priv(dev);
3021 u32 rx_pending, tx_pending;
3022 struct receive_queue *rq;
3023 struct send_queue *sq;
3024 int i, err;
3025
3026 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
3027 return -EINVAL;
3028
3029 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
3030 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
3031
3032 if (ring->rx_pending == rx_pending &&
3033 ring->tx_pending == tx_pending)
3034 return 0;
3035
3036 if (ring->rx_pending > vi->rq[0].vq->num_max)
3037 return -EINVAL;
3038
3039 if (ring->tx_pending > vi->sq[0].vq->num_max)
3040 return -EINVAL;
3041
3042 for (i = 0; i < vi->max_queue_pairs; i++) {
3043 rq = vi->rq + i;
3044 sq = vi->sq + i;
3045
3046 if (ring->tx_pending != tx_pending) {
3047 err = virtnet_tx_resize(vi, sq, ring->tx_pending);
3048 if (err)
3049 return err;
3050
3051 /* Upon disabling and re-enabling a transmit virtqueue, the device must
3052 * set the coalescing parameters of the virtqueue to those configured
3053 * through the VIRTIO_NET_CTRL_NOTF_COAL_TX_SET command, or, if the driver
3054 * did not set any TX coalescing parameters, to 0.
3055 */
3056 err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, i,
3057 vi->intr_coal_tx.max_usecs,
3058 vi->intr_coal_tx.max_packets);
3059 if (err)
3060 return err;
3061 }
3062
3063 if (ring->rx_pending != rx_pending) {
3064 err = virtnet_rx_resize(vi, rq, ring->rx_pending);
3065 if (err)
3066 return err;
3067
3068 /* The reason is same as the transmit virtqueue reset */
3069 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, i,
3070 vi->intr_coal_rx.max_usecs,
3071 vi->intr_coal_rx.max_packets);
3072 if (err)
3073 return err;
3074 }
3075 }
3076
3077 return 0;
3078}
3079
3080static bool virtnet_commit_rss_command(struct virtnet_info *vi)
3081{
3082 struct net_device *dev = vi->dev;
3083 struct scatterlist sgs[4];
3084 unsigned int sg_buf_size;
3085
3086 /* prepare sgs */
3087 sg_init_table(sgs, 4);
3088
3089 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table);
3090 sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size);
3091
3092 sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1);
3093 sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size);
3094
3095 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key)
3096 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq);
3097 sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size);
3098
3099 sg_buf_size = vi->rss_key_size;
3100 sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size);
3101
3102 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
3103 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
3104 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
3105 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
3106 return false;
3107 }
3108 return true;
3109}
3110
3111static void virtnet_init_default_rss(struct virtnet_info *vi)
3112{
3113 u32 indir_val = 0;
3114 int i = 0;
3115
3116 vi->ctrl->rss.hash_types = vi->rss_hash_types_supported;
3117 vi->rss_hash_types_saved = vi->rss_hash_types_supported;
3118 vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size
3119 ? vi->rss_indir_table_size - 1 : 0;
3120 vi->ctrl->rss.unclassified_queue = 0;
3121
3122 for (; i < vi->rss_indir_table_size; ++i) {
3123 indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs);
3124 vi->ctrl->rss.indirection_table[i] = indir_val;
3125 }
3126
3127 vi->ctrl->rss.max_tx_vq = vi->has_rss ? vi->curr_queue_pairs : 0;
3128 vi->ctrl->rss.hash_key_length = vi->rss_key_size;
3129
3130 netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size);
3131}
3132
3133static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info)
3134{
3135 info->data = 0;
3136 switch (info->flow_type) {
3137 case TCP_V4_FLOW:
3138 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
3139 info->data = RXH_IP_SRC | RXH_IP_DST |
3140 RXH_L4_B_0_1 | RXH_L4_B_2_3;
3141 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
3142 info->data = RXH_IP_SRC | RXH_IP_DST;
3143 }
3144 break;
3145 case TCP_V6_FLOW:
3146 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
3147 info->data = RXH_IP_SRC | RXH_IP_DST |
3148 RXH_L4_B_0_1 | RXH_L4_B_2_3;
3149 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
3150 info->data = RXH_IP_SRC | RXH_IP_DST;
3151 }
3152 break;
3153 case UDP_V4_FLOW:
3154 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
3155 info->data = RXH_IP_SRC | RXH_IP_DST |
3156 RXH_L4_B_0_1 | RXH_L4_B_2_3;
3157 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
3158 info->data = RXH_IP_SRC | RXH_IP_DST;
3159 }
3160 break;
3161 case UDP_V6_FLOW:
3162 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
3163 info->data = RXH_IP_SRC | RXH_IP_DST |
3164 RXH_L4_B_0_1 | RXH_L4_B_2_3;
3165 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
3166 info->data = RXH_IP_SRC | RXH_IP_DST;
3167 }
3168 break;
3169 case IPV4_FLOW:
3170 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4)
3171 info->data = RXH_IP_SRC | RXH_IP_DST;
3172
3173 break;
3174 case IPV6_FLOW:
3175 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6)
3176 info->data = RXH_IP_SRC | RXH_IP_DST;
3177
3178 break;
3179 default:
3180 info->data = 0;
3181 break;
3182 }
3183}
3184
3185static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info)
3186{
3187 u32 new_hashtypes = vi->rss_hash_types_saved;
3188 bool is_disable = info->data & RXH_DISCARD;
3189 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3);
3190
3191 /* supports only 'sd', 'sdfn' and 'r' */
3192 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable))
3193 return false;
3194
3195 switch (info->flow_type) {
3196 case TCP_V4_FLOW:
3197 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4);
3198 if (!is_disable)
3199 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
3200 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0);
3201 break;
3202 case UDP_V4_FLOW:
3203 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4);
3204 if (!is_disable)
3205 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
3206 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0);
3207 break;
3208 case IPV4_FLOW:
3209 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4;
3210 if (!is_disable)
3211 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4;
3212 break;
3213 case TCP_V6_FLOW:
3214 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6);
3215 if (!is_disable)
3216 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
3217 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0);
3218 break;
3219 case UDP_V6_FLOW:
3220 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6);
3221 if (!is_disable)
3222 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
3223 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0);
3224 break;
3225 case IPV6_FLOW:
3226 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6;
3227 if (!is_disable)
3228 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6;
3229 break;
3230 default:
3231 /* unsupported flow */
3232 return false;
3233 }
3234
3235 /* if unsupported hashtype was set */
3236 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported))
3237 return false;
3238
3239 if (new_hashtypes != vi->rss_hash_types_saved) {
3240 vi->rss_hash_types_saved = new_hashtypes;
3241 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved;
3242 if (vi->dev->features & NETIF_F_RXHASH)
3243 return virtnet_commit_rss_command(vi);
3244 }
3245
3246 return true;
3247}
3248
3249static void virtnet_get_drvinfo(struct net_device *dev,
3250 struct ethtool_drvinfo *info)
3251{
3252 struct virtnet_info *vi = netdev_priv(dev);
3253 struct virtio_device *vdev = vi->vdev;
3254
3255 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
3256 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
3257 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
3258
3259}
3260
3261/* TODO: Eliminate OOO packets during switching */
3262static int virtnet_set_channels(struct net_device *dev,
3263 struct ethtool_channels *channels)
3264{
3265 struct virtnet_info *vi = netdev_priv(dev);
3266 u16 queue_pairs = channels->combined_count;
3267 int err;
3268
3269 /* We don't support separate rx/tx channels.
3270 * We don't allow setting 'other' channels.
3271 */
3272 if (channels->rx_count || channels->tx_count || channels->other_count)
3273 return -EINVAL;
3274
3275 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
3276 return -EINVAL;
3277
3278 /* For now we don't support modifying channels while XDP is loaded
3279 * also when XDP is loaded all RX queues have XDP programs so we only
3280 * need to check a single RX queue.
3281 */
3282 if (vi->rq[0].xdp_prog)
3283 return -EINVAL;
3284
3285 cpus_read_lock();
3286 err = _virtnet_set_queues(vi, queue_pairs);
3287 if (err) {
3288 cpus_read_unlock();
3289 goto err;
3290 }
3291 virtnet_set_affinity(vi);
3292 cpus_read_unlock();
3293
3294 netif_set_real_num_tx_queues(dev, queue_pairs);
3295 netif_set_real_num_rx_queues(dev, queue_pairs);
3296 err:
3297 return err;
3298}
3299
3300static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
3301{
3302 struct virtnet_info *vi = netdev_priv(dev);
3303 unsigned int i, j;
3304 u8 *p = data;
3305
3306 switch (stringset) {
3307 case ETH_SS_STATS:
3308 for (i = 0; i < vi->curr_queue_pairs; i++) {
3309 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++)
3310 ethtool_sprintf(&p, "rx_queue_%u_%s", i,
3311 virtnet_rq_stats_desc[j].desc);
3312 }
3313
3314 for (i = 0; i < vi->curr_queue_pairs; i++) {
3315 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++)
3316 ethtool_sprintf(&p, "tx_queue_%u_%s", i,
3317 virtnet_sq_stats_desc[j].desc);
3318 }
3319 break;
3320 }
3321}
3322
3323static int virtnet_get_sset_count(struct net_device *dev, int sset)
3324{
3325 struct virtnet_info *vi = netdev_priv(dev);
3326
3327 switch (sset) {
3328 case ETH_SS_STATS:
3329 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
3330 VIRTNET_SQ_STATS_LEN);
3331 default:
3332 return -EOPNOTSUPP;
3333 }
3334}
3335
3336static void virtnet_get_ethtool_stats(struct net_device *dev,
3337 struct ethtool_stats *stats, u64 *data)
3338{
3339 struct virtnet_info *vi = netdev_priv(dev);
3340 unsigned int idx = 0, start, i, j;
3341 const u8 *stats_base;
3342 const u64_stats_t *p;
3343 size_t offset;
3344
3345 for (i = 0; i < vi->curr_queue_pairs; i++) {
3346 struct receive_queue *rq = &vi->rq[i];
3347
3348 stats_base = (const u8 *)&rq->stats;
3349 do {
3350 start = u64_stats_fetch_begin(&rq->stats.syncp);
3351 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
3352 offset = virtnet_rq_stats_desc[j].offset;
3353 p = (const u64_stats_t *)(stats_base + offset);
3354 data[idx + j] = u64_stats_read(p);
3355 }
3356 } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
3357 idx += VIRTNET_RQ_STATS_LEN;
3358 }
3359
3360 for (i = 0; i < vi->curr_queue_pairs; i++) {
3361 struct send_queue *sq = &vi->sq[i];
3362
3363 stats_base = (const u8 *)&sq->stats;
3364 do {
3365 start = u64_stats_fetch_begin(&sq->stats.syncp);
3366 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
3367 offset = virtnet_sq_stats_desc[j].offset;
3368 p = (const u64_stats_t *)(stats_base + offset);
3369 data[idx + j] = u64_stats_read(p);
3370 }
3371 } while (u64_stats_fetch_retry(&sq->stats.syncp, start));
3372 idx += VIRTNET_SQ_STATS_LEN;
3373 }
3374}
3375
3376static void virtnet_get_channels(struct net_device *dev,
3377 struct ethtool_channels *channels)
3378{
3379 struct virtnet_info *vi = netdev_priv(dev);
3380
3381 channels->combined_count = vi->curr_queue_pairs;
3382 channels->max_combined = vi->max_queue_pairs;
3383 channels->max_other = 0;
3384 channels->rx_count = 0;
3385 channels->tx_count = 0;
3386 channels->other_count = 0;
3387}
3388
3389static int virtnet_set_link_ksettings(struct net_device *dev,
3390 const struct ethtool_link_ksettings *cmd)
3391{
3392 struct virtnet_info *vi = netdev_priv(dev);
3393
3394 return ethtool_virtdev_set_link_ksettings(dev, cmd,
3395 &vi->speed, &vi->duplex);
3396}
3397
3398static int virtnet_get_link_ksettings(struct net_device *dev,
3399 struct ethtool_link_ksettings *cmd)
3400{
3401 struct virtnet_info *vi = netdev_priv(dev);
3402
3403 cmd->base.speed = vi->speed;
3404 cmd->base.duplex = vi->duplex;
3405 cmd->base.port = PORT_OTHER;
3406
3407 return 0;
3408}
3409
3410static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
3411 struct ethtool_coalesce *ec)
3412{
3413 struct scatterlist sgs_tx;
3414 int i;
3415
3416 vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
3417 vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
3418 sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx));
3419
3420 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
3421 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
3422 &sgs_tx))
3423 return -EINVAL;
3424
3425 vi->intr_coal_tx.max_usecs = ec->tx_coalesce_usecs;
3426 vi->intr_coal_tx.max_packets = ec->tx_max_coalesced_frames;
3427 for (i = 0; i < vi->max_queue_pairs; i++) {
3428 vi->sq[i].intr_coal.max_usecs = ec->tx_coalesce_usecs;
3429 vi->sq[i].intr_coal.max_packets = ec->tx_max_coalesced_frames;
3430 }
3431
3432 return 0;
3433}
3434
3435static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi,
3436 struct ethtool_coalesce *ec)
3437{
3438 bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
3439 struct scatterlist sgs_rx;
3440 int i;
3441
3442 if (rx_ctrl_dim_on && !virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3443 return -EOPNOTSUPP;
3444
3445 if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != vi->intr_coal_rx.max_usecs ||
3446 ec->rx_max_coalesced_frames != vi->intr_coal_rx.max_packets))
3447 return -EINVAL;
3448
3449 if (rx_ctrl_dim_on && !vi->rx_dim_enabled) {
3450 vi->rx_dim_enabled = true;
3451 for (i = 0; i < vi->max_queue_pairs; i++)
3452 vi->rq[i].dim_enabled = true;
3453 return 0;
3454 }
3455
3456 if (!rx_ctrl_dim_on && vi->rx_dim_enabled) {
3457 vi->rx_dim_enabled = false;
3458 for (i = 0; i < vi->max_queue_pairs; i++)
3459 vi->rq[i].dim_enabled = false;
3460 }
3461
3462 /* Since the per-queue coalescing params can be set,
3463 * we need apply the global new params even if they
3464 * are not updated.
3465 */
3466 vi->ctrl->coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs);
3467 vi->ctrl->coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames);
3468 sg_init_one(&sgs_rx, &vi->ctrl->coal_rx, sizeof(vi->ctrl->coal_rx));
3469
3470 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
3471 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
3472 &sgs_rx))
3473 return -EINVAL;
3474
3475 vi->intr_coal_rx.max_usecs = ec->rx_coalesce_usecs;
3476 vi->intr_coal_rx.max_packets = ec->rx_max_coalesced_frames;
3477 for (i = 0; i < vi->max_queue_pairs; i++) {
3478 vi->rq[i].intr_coal.max_usecs = ec->rx_coalesce_usecs;
3479 vi->rq[i].intr_coal.max_packets = ec->rx_max_coalesced_frames;
3480 }
3481
3482 return 0;
3483}
3484
3485static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
3486 struct ethtool_coalesce *ec)
3487{
3488 int err;
3489
3490 err = virtnet_send_tx_notf_coal_cmds(vi, ec);
3491 if (err)
3492 return err;
3493
3494 err = virtnet_send_rx_notf_coal_cmds(vi, ec);
3495 if (err)
3496 return err;
3497
3498 return 0;
3499}
3500
3501static int virtnet_send_rx_notf_coal_vq_cmds(struct virtnet_info *vi,
3502 struct ethtool_coalesce *ec,
3503 u16 queue)
3504{
3505 bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
3506 bool cur_rx_dim = vi->rq[queue].dim_enabled;
3507 u32 max_usecs, max_packets;
3508 int err;
3509
3510 max_usecs = vi->rq[queue].intr_coal.max_usecs;
3511 max_packets = vi->rq[queue].intr_coal.max_packets;
3512
3513 if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != max_usecs ||
3514 ec->rx_max_coalesced_frames != max_packets))
3515 return -EINVAL;
3516
3517 if (rx_ctrl_dim_on && !cur_rx_dim) {
3518 vi->rq[queue].dim_enabled = true;
3519 return 0;
3520 }
3521
3522 if (!rx_ctrl_dim_on && cur_rx_dim)
3523 vi->rq[queue].dim_enabled = false;
3524
3525 /* If no params are updated, userspace ethtool will
3526 * reject the modification.
3527 */
3528 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, queue,
3529 ec->rx_coalesce_usecs,
3530 ec->rx_max_coalesced_frames);
3531 if (err)
3532 return err;
3533
3534 return 0;
3535}
3536
3537static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
3538 struct ethtool_coalesce *ec,
3539 u16 queue)
3540{
3541 int err;
3542
3543 err = virtnet_send_rx_notf_coal_vq_cmds(vi, ec, queue);
3544 if (err)
3545 return err;
3546
3547 err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
3548 ec->tx_coalesce_usecs,
3549 ec->tx_max_coalesced_frames);
3550 if (err)
3551 return err;
3552
3553 return 0;
3554}
3555
3556static void virtnet_rx_dim_work(struct work_struct *work)
3557{
3558 struct dim *dim = container_of(work, struct dim, work);
3559 struct receive_queue *rq = container_of(dim,
3560 struct receive_queue, dim);
3561 struct virtnet_info *vi = rq->vq->vdev->priv;
3562 struct net_device *dev = vi->dev;
3563 struct dim_cq_moder update_moder;
3564 int i, qnum, err;
3565
3566 if (!rtnl_trylock())
3567 return;
3568
3569 /* Each rxq's work is queued by "net_dim()->schedule_work()"
3570 * in response to NAPI traffic changes. Note that dim->profile_ix
3571 * for each rxq is updated prior to the queuing action.
3572 * So we only need to traverse and update profiles for all rxqs
3573 * in the work which is holding rtnl_lock.
3574 */
3575 for (i = 0; i < vi->curr_queue_pairs; i++) {
3576 rq = &vi->rq[i];
3577 dim = &rq->dim;
3578 qnum = rq - vi->rq;
3579
3580 if (!rq->dim_enabled)
3581 continue;
3582
3583 update_moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
3584 if (update_moder.usec != rq->intr_coal.max_usecs ||
3585 update_moder.pkts != rq->intr_coal.max_packets) {
3586 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, qnum,
3587 update_moder.usec,
3588 update_moder.pkts);
3589 if (err)
3590 pr_debug("%s: Failed to send dim parameters on rxq%d\n",
3591 dev->name, qnum);
3592 dim->state = DIM_START_MEASURE;
3593 }
3594 }
3595
3596 rtnl_unlock();
3597}
3598
3599static int virtnet_coal_params_supported(struct ethtool_coalesce *ec)
3600{
3601 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL
3602 * or VIRTIO_NET_F_VQ_NOTF_COAL feature is negotiated.
3603 */
3604 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs)
3605 return -EOPNOTSUPP;
3606
3607 if (ec->tx_max_coalesced_frames > 1 ||
3608 ec->rx_max_coalesced_frames != 1)
3609 return -EINVAL;
3610
3611 return 0;
3612}
3613
3614static int virtnet_should_update_vq_weight(int dev_flags, int weight,
3615 int vq_weight, bool *should_update)
3616{
3617 if (weight ^ vq_weight) {
3618 if (dev_flags & IFF_UP)
3619 return -EBUSY;
3620 *should_update = true;
3621 }
3622
3623 return 0;
3624}
3625
3626static int virtnet_set_coalesce(struct net_device *dev,
3627 struct ethtool_coalesce *ec,
3628 struct kernel_ethtool_coalesce *kernel_coal,
3629 struct netlink_ext_ack *extack)
3630{
3631 struct virtnet_info *vi = netdev_priv(dev);
3632 int ret, queue_number, napi_weight;
3633 bool update_napi = false;
3634
3635 /* Can't change NAPI weight if the link is up */
3636 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
3637 for (queue_number = 0; queue_number < vi->max_queue_pairs; queue_number++) {
3638 ret = virtnet_should_update_vq_weight(dev->flags, napi_weight,
3639 vi->sq[queue_number].napi.weight,
3640 &update_napi);
3641 if (ret)
3642 return ret;
3643
3644 if (update_napi) {
3645 /* All queues that belong to [queue_number, vi->max_queue_pairs] will be
3646 * updated for the sake of simplicity, which might not be necessary
3647 */
3648 break;
3649 }
3650 }
3651
3652 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL))
3653 ret = virtnet_send_notf_coal_cmds(vi, ec);
3654 else
3655 ret = virtnet_coal_params_supported(ec);
3656
3657 if (ret)
3658 return ret;
3659
3660 if (update_napi) {
3661 for (; queue_number < vi->max_queue_pairs; queue_number++)
3662 vi->sq[queue_number].napi.weight = napi_weight;
3663 }
3664
3665 return ret;
3666}
3667
3668static int virtnet_get_coalesce(struct net_device *dev,
3669 struct ethtool_coalesce *ec,
3670 struct kernel_ethtool_coalesce *kernel_coal,
3671 struct netlink_ext_ack *extack)
3672{
3673 struct virtnet_info *vi = netdev_priv(dev);
3674
3675 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
3676 ec->rx_coalesce_usecs = vi->intr_coal_rx.max_usecs;
3677 ec->tx_coalesce_usecs = vi->intr_coal_tx.max_usecs;
3678 ec->tx_max_coalesced_frames = vi->intr_coal_tx.max_packets;
3679 ec->rx_max_coalesced_frames = vi->intr_coal_rx.max_packets;
3680 ec->use_adaptive_rx_coalesce = vi->rx_dim_enabled;
3681 } else {
3682 ec->rx_max_coalesced_frames = 1;
3683
3684 if (vi->sq[0].napi.weight)
3685 ec->tx_max_coalesced_frames = 1;
3686 }
3687
3688 return 0;
3689}
3690
3691static int virtnet_set_per_queue_coalesce(struct net_device *dev,
3692 u32 queue,
3693 struct ethtool_coalesce *ec)
3694{
3695 struct virtnet_info *vi = netdev_priv(dev);
3696 int ret, napi_weight;
3697 bool update_napi = false;
3698
3699 if (queue >= vi->max_queue_pairs)
3700 return -EINVAL;
3701
3702 /* Can't change NAPI weight if the link is up */
3703 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
3704 ret = virtnet_should_update_vq_weight(dev->flags, napi_weight,
3705 vi->sq[queue].napi.weight,
3706 &update_napi);
3707 if (ret)
3708 return ret;
3709
3710 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3711 ret = virtnet_send_notf_coal_vq_cmds(vi, ec, queue);
3712 else
3713 ret = virtnet_coal_params_supported(ec);
3714
3715 if (ret)
3716 return ret;
3717
3718 if (update_napi)
3719 vi->sq[queue].napi.weight = napi_weight;
3720
3721 return 0;
3722}
3723
3724static int virtnet_get_per_queue_coalesce(struct net_device *dev,
3725 u32 queue,
3726 struct ethtool_coalesce *ec)
3727{
3728 struct virtnet_info *vi = netdev_priv(dev);
3729
3730 if (queue >= vi->max_queue_pairs)
3731 return -EINVAL;
3732
3733 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
3734 ec->rx_coalesce_usecs = vi->rq[queue].intr_coal.max_usecs;
3735 ec->tx_coalesce_usecs = vi->sq[queue].intr_coal.max_usecs;
3736 ec->tx_max_coalesced_frames = vi->sq[queue].intr_coal.max_packets;
3737 ec->rx_max_coalesced_frames = vi->rq[queue].intr_coal.max_packets;
3738 ec->use_adaptive_rx_coalesce = vi->rq[queue].dim_enabled;
3739 } else {
3740 ec->rx_max_coalesced_frames = 1;
3741
3742 if (vi->sq[queue].napi.weight)
3743 ec->tx_max_coalesced_frames = 1;
3744 }
3745
3746 return 0;
3747}
3748
3749static void virtnet_init_settings(struct net_device *dev)
3750{
3751 struct virtnet_info *vi = netdev_priv(dev);
3752
3753 vi->speed = SPEED_UNKNOWN;
3754 vi->duplex = DUPLEX_UNKNOWN;
3755}
3756
3757static void virtnet_update_settings(struct virtnet_info *vi)
3758{
3759 u32 speed;
3760 u8 duplex;
3761
3762 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
3763 return;
3764
3765 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
3766
3767 if (ethtool_validate_speed(speed))
3768 vi->speed = speed;
3769
3770 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
3771
3772 if (ethtool_validate_duplex(duplex))
3773 vi->duplex = duplex;
3774}
3775
3776static u32 virtnet_get_rxfh_key_size(struct net_device *dev)
3777{
3778 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size;
3779}
3780
3781static u32 virtnet_get_rxfh_indir_size(struct net_device *dev)
3782{
3783 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size;
3784}
3785
3786static int virtnet_get_rxfh(struct net_device *dev,
3787 struct ethtool_rxfh_param *rxfh)
3788{
3789 struct virtnet_info *vi = netdev_priv(dev);
3790 int i;
3791
3792 if (rxfh->indir) {
3793 for (i = 0; i < vi->rss_indir_table_size; ++i)
3794 rxfh->indir[i] = vi->ctrl->rss.indirection_table[i];
3795 }
3796
3797 if (rxfh->key)
3798 memcpy(rxfh->key, vi->ctrl->rss.key, vi->rss_key_size);
3799
3800 rxfh->hfunc = ETH_RSS_HASH_TOP;
3801
3802 return 0;
3803}
3804
3805static int virtnet_set_rxfh(struct net_device *dev,
3806 struct ethtool_rxfh_param *rxfh,
3807 struct netlink_ext_ack *extack)
3808{
3809 struct virtnet_info *vi = netdev_priv(dev);
3810 bool update = false;
3811 int i;
3812
3813 if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
3814 rxfh->hfunc != ETH_RSS_HASH_TOP)
3815 return -EOPNOTSUPP;
3816
3817 if (rxfh->indir) {
3818 if (!vi->has_rss)
3819 return -EOPNOTSUPP;
3820
3821 for (i = 0; i < vi->rss_indir_table_size; ++i)
3822 vi->ctrl->rss.indirection_table[i] = rxfh->indir[i];
3823 update = true;
3824 }
3825
3826 if (rxfh->key) {
3827 /* If either _F_HASH_REPORT or _F_RSS are negotiated, the
3828 * device provides hash calculation capabilities, that is,
3829 * hash_key is configured.
3830 */
3831 if (!vi->has_rss && !vi->has_rss_hash_report)
3832 return -EOPNOTSUPP;
3833
3834 memcpy(vi->ctrl->rss.key, rxfh->key, vi->rss_key_size);
3835 update = true;
3836 }
3837
3838 if (update)
3839 virtnet_commit_rss_command(vi);
3840
3841 return 0;
3842}
3843
3844static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs)
3845{
3846 struct virtnet_info *vi = netdev_priv(dev);
3847 int rc = 0;
3848
3849 switch (info->cmd) {
3850 case ETHTOOL_GRXRINGS:
3851 info->data = vi->curr_queue_pairs;
3852 break;
3853 case ETHTOOL_GRXFH:
3854 virtnet_get_hashflow(vi, info);
3855 break;
3856 default:
3857 rc = -EOPNOTSUPP;
3858 }
3859
3860 return rc;
3861}
3862
3863static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
3864{
3865 struct virtnet_info *vi = netdev_priv(dev);
3866 int rc = 0;
3867
3868 switch (info->cmd) {
3869 case ETHTOOL_SRXFH:
3870 if (!virtnet_set_hashflow(vi, info))
3871 rc = -EINVAL;
3872
3873 break;
3874 default:
3875 rc = -EOPNOTSUPP;
3876 }
3877
3878 return rc;
3879}
3880
3881static const struct ethtool_ops virtnet_ethtool_ops = {
3882 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
3883 ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
3884 .get_drvinfo = virtnet_get_drvinfo,
3885 .get_link = ethtool_op_get_link,
3886 .get_ringparam = virtnet_get_ringparam,
3887 .set_ringparam = virtnet_set_ringparam,
3888 .get_strings = virtnet_get_strings,
3889 .get_sset_count = virtnet_get_sset_count,
3890 .get_ethtool_stats = virtnet_get_ethtool_stats,
3891 .set_channels = virtnet_set_channels,
3892 .get_channels = virtnet_get_channels,
3893 .get_ts_info = ethtool_op_get_ts_info,
3894 .get_link_ksettings = virtnet_get_link_ksettings,
3895 .set_link_ksettings = virtnet_set_link_ksettings,
3896 .set_coalesce = virtnet_set_coalesce,
3897 .get_coalesce = virtnet_get_coalesce,
3898 .set_per_queue_coalesce = virtnet_set_per_queue_coalesce,
3899 .get_per_queue_coalesce = virtnet_get_per_queue_coalesce,
3900 .get_rxfh_key_size = virtnet_get_rxfh_key_size,
3901 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size,
3902 .get_rxfh = virtnet_get_rxfh,
3903 .set_rxfh = virtnet_set_rxfh,
3904 .get_rxnfc = virtnet_get_rxnfc,
3905 .set_rxnfc = virtnet_set_rxnfc,
3906};
3907
3908static void virtnet_freeze_down(struct virtio_device *vdev)
3909{
3910 struct virtnet_info *vi = vdev->priv;
3911
3912 /* Make sure no work handler is accessing the device */
3913 flush_work(&vi->config_work);
3914 disable_rx_mode_work(vi);
3915 flush_work(&vi->rx_mode_work);
3916
3917 netif_tx_lock_bh(vi->dev);
3918 netif_device_detach(vi->dev);
3919 netif_tx_unlock_bh(vi->dev);
3920 if (netif_running(vi->dev))
3921 virtnet_close(vi->dev);
3922}
3923
3924static int init_vqs(struct virtnet_info *vi);
3925
3926static int virtnet_restore_up(struct virtio_device *vdev)
3927{
3928 struct virtnet_info *vi = vdev->priv;
3929 int err;
3930
3931 err = init_vqs(vi);
3932 if (err)
3933 return err;
3934
3935 virtio_device_ready(vdev);
3936
3937 enable_delayed_refill(vi);
3938 enable_rx_mode_work(vi);
3939
3940 if (netif_running(vi->dev)) {
3941 err = virtnet_open(vi->dev);
3942 if (err)
3943 return err;
3944 }
3945
3946 netif_tx_lock_bh(vi->dev);
3947 netif_device_attach(vi->dev);
3948 netif_tx_unlock_bh(vi->dev);
3949 return err;
3950}
3951
3952static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
3953{
3954 struct scatterlist sg;
3955 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
3956
3957 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
3958
3959 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
3960 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
3961 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
3962 return -EINVAL;
3963 }
3964
3965 return 0;
3966}
3967
3968static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
3969{
3970 u64 offloads = 0;
3971
3972 if (!vi->guest_offloads)
3973 return 0;
3974
3975 return virtnet_set_guest_offloads(vi, offloads);
3976}
3977
3978static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
3979{
3980 u64 offloads = vi->guest_offloads;
3981
3982 if (!vi->guest_offloads)
3983 return 0;
3984
3985 return virtnet_set_guest_offloads(vi, offloads);
3986}
3987
3988static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
3989 struct netlink_ext_ack *extack)
3990{
3991 unsigned int room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM +
3992 sizeof(struct skb_shared_info));
3993 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN;
3994 struct virtnet_info *vi = netdev_priv(dev);
3995 struct bpf_prog *old_prog;
3996 u16 xdp_qp = 0, curr_qp;
3997 int i, err;
3998
3999 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
4000 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
4001 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
4002 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
4003 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
4004 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) ||
4005 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) ||
4006 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) {
4007 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first");
4008 return -EOPNOTSUPP;
4009 }
4010
4011 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
4012 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
4013 return -EINVAL;
4014 }
4015
4016 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) {
4017 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags");
4018 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz);
4019 return -EINVAL;
4020 }
4021
4022 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
4023 if (prog)
4024 xdp_qp = nr_cpu_ids;
4025
4026 /* XDP requires extra queues for XDP_TX */
4027 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
4028 netdev_warn_once(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n",
4029 curr_qp + xdp_qp, vi->max_queue_pairs);
4030 xdp_qp = 0;
4031 }
4032
4033 old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
4034 if (!prog && !old_prog)
4035 return 0;
4036
4037 if (prog)
4038 bpf_prog_add(prog, vi->max_queue_pairs - 1);
4039
4040 /* Make sure NAPI is not using any XDP TX queues for RX. */
4041 if (netif_running(dev)) {
4042 for (i = 0; i < vi->max_queue_pairs; i++) {
4043 napi_disable(&vi->rq[i].napi);
4044 virtnet_napi_tx_disable(&vi->sq[i].napi);
4045 }
4046 }
4047
4048 if (!prog) {
4049 for (i = 0; i < vi->max_queue_pairs; i++) {
4050 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
4051 if (i == 0)
4052 virtnet_restore_guest_offloads(vi);
4053 }
4054 synchronize_net();
4055 }
4056
4057 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
4058 if (err)
4059 goto err;
4060 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
4061 vi->xdp_queue_pairs = xdp_qp;
4062
4063 if (prog) {
4064 vi->xdp_enabled = true;
4065 for (i = 0; i < vi->max_queue_pairs; i++) {
4066 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
4067 if (i == 0 && !old_prog)
4068 virtnet_clear_guest_offloads(vi);
4069 }
4070 if (!old_prog)
4071 xdp_features_set_redirect_target(dev, true);
4072 } else {
4073 xdp_features_clear_redirect_target(dev);
4074 vi->xdp_enabled = false;
4075 }
4076
4077 for (i = 0; i < vi->max_queue_pairs; i++) {
4078 if (old_prog)
4079 bpf_prog_put(old_prog);
4080 if (netif_running(dev)) {
4081 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
4082 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
4083 &vi->sq[i].napi);
4084 }
4085 }
4086
4087 return 0;
4088
4089err:
4090 if (!prog) {
4091 virtnet_clear_guest_offloads(vi);
4092 for (i = 0; i < vi->max_queue_pairs; i++)
4093 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
4094 }
4095
4096 if (netif_running(dev)) {
4097 for (i = 0; i < vi->max_queue_pairs; i++) {
4098 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
4099 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
4100 &vi->sq[i].napi);
4101 }
4102 }
4103 if (prog)
4104 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
4105 return err;
4106}
4107
4108static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
4109{
4110 switch (xdp->command) {
4111 case XDP_SETUP_PROG:
4112 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
4113 default:
4114 return -EINVAL;
4115 }
4116}
4117
4118static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
4119 size_t len)
4120{
4121 struct virtnet_info *vi = netdev_priv(dev);
4122 int ret;
4123
4124 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
4125 return -EOPNOTSUPP;
4126
4127 ret = snprintf(buf, len, "sby");
4128 if (ret >= len)
4129 return -EOPNOTSUPP;
4130
4131 return 0;
4132}
4133
4134static int virtnet_set_features(struct net_device *dev,
4135 netdev_features_t features)
4136{
4137 struct virtnet_info *vi = netdev_priv(dev);
4138 u64 offloads;
4139 int err;
4140
4141 if ((dev->features ^ features) & NETIF_F_GRO_HW) {
4142 if (vi->xdp_enabled)
4143 return -EBUSY;
4144
4145 if (features & NETIF_F_GRO_HW)
4146 offloads = vi->guest_offloads_capable;
4147 else
4148 offloads = vi->guest_offloads_capable &
4149 ~GUEST_OFFLOAD_GRO_HW_MASK;
4150
4151 err = virtnet_set_guest_offloads(vi, offloads);
4152 if (err)
4153 return err;
4154 vi->guest_offloads = offloads;
4155 }
4156
4157 if ((dev->features ^ features) & NETIF_F_RXHASH) {
4158 if (features & NETIF_F_RXHASH)
4159 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved;
4160 else
4161 vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE;
4162
4163 if (!virtnet_commit_rss_command(vi))
4164 return -EINVAL;
4165 }
4166
4167 return 0;
4168}
4169
4170static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue)
4171{
4172 struct virtnet_info *priv = netdev_priv(dev);
4173 struct send_queue *sq = &priv->sq[txqueue];
4174 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue);
4175
4176 u64_stats_update_begin(&sq->stats.syncp);
4177 u64_stats_inc(&sq->stats.tx_timeouts);
4178 u64_stats_update_end(&sq->stats.syncp);
4179
4180 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n",
4181 txqueue, sq->name, sq->vq->index, sq->vq->name,
4182 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start)));
4183}
4184
4185static const struct net_device_ops virtnet_netdev = {
4186 .ndo_open = virtnet_open,
4187 .ndo_stop = virtnet_close,
4188 .ndo_start_xmit = start_xmit,
4189 .ndo_validate_addr = eth_validate_addr,
4190 .ndo_set_mac_address = virtnet_set_mac_address,
4191 .ndo_set_rx_mode = virtnet_set_rx_mode,
4192 .ndo_get_stats64 = virtnet_stats,
4193 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
4194 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
4195 .ndo_bpf = virtnet_xdp,
4196 .ndo_xdp_xmit = virtnet_xdp_xmit,
4197 .ndo_features_check = passthru_features_check,
4198 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
4199 .ndo_set_features = virtnet_set_features,
4200 .ndo_tx_timeout = virtnet_tx_timeout,
4201};
4202
4203static void virtnet_config_changed_work(struct work_struct *work)
4204{
4205 struct virtnet_info *vi =
4206 container_of(work, struct virtnet_info, config_work);
4207 u16 v;
4208
4209 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
4210 struct virtio_net_config, status, &v) < 0)
4211 return;
4212
4213 if (v & VIRTIO_NET_S_ANNOUNCE) {
4214 netdev_notify_peers(vi->dev);
4215 virtnet_ack_link_announce(vi);
4216 }
4217
4218 /* Ignore unknown (future) status bits */
4219 v &= VIRTIO_NET_S_LINK_UP;
4220
4221 if (vi->status == v)
4222 return;
4223
4224 vi->status = v;
4225
4226 if (vi->status & VIRTIO_NET_S_LINK_UP) {
4227 virtnet_update_settings(vi);
4228 netif_carrier_on(vi->dev);
4229 netif_tx_wake_all_queues(vi->dev);
4230 } else {
4231 netif_carrier_off(vi->dev);
4232 netif_tx_stop_all_queues(vi->dev);
4233 }
4234}
4235
4236static void virtnet_config_changed(struct virtio_device *vdev)
4237{
4238 struct virtnet_info *vi = vdev->priv;
4239
4240 schedule_work(&vi->config_work);
4241}
4242
4243static void virtnet_free_queues(struct virtnet_info *vi)
4244{
4245 int i;
4246
4247 for (i = 0; i < vi->max_queue_pairs; i++) {
4248 __netif_napi_del(&vi->rq[i].napi);
4249 __netif_napi_del(&vi->sq[i].napi);
4250 }
4251
4252 /* We called __netif_napi_del(),
4253 * we need to respect an RCU grace period before freeing vi->rq
4254 */
4255 synchronize_net();
4256
4257 kfree(vi->rq);
4258 kfree(vi->sq);
4259 kfree(vi->ctrl);
4260}
4261
4262static void _free_receive_bufs(struct virtnet_info *vi)
4263{
4264 struct bpf_prog *old_prog;
4265 int i;
4266
4267 for (i = 0; i < vi->max_queue_pairs; i++) {
4268 while (vi->rq[i].pages)
4269 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
4270
4271 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
4272 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
4273 if (old_prog)
4274 bpf_prog_put(old_prog);
4275 }
4276}
4277
4278static void free_receive_bufs(struct virtnet_info *vi)
4279{
4280 rtnl_lock();
4281 _free_receive_bufs(vi);
4282 rtnl_unlock();
4283}
4284
4285static void free_receive_page_frags(struct virtnet_info *vi)
4286{
4287 int i;
4288 for (i = 0; i < vi->max_queue_pairs; i++)
4289 if (vi->rq[i].alloc_frag.page) {
4290 if (vi->rq[i].do_dma && vi->rq[i].last_dma)
4291 virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0);
4292 put_page(vi->rq[i].alloc_frag.page);
4293 }
4294}
4295
4296static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
4297{
4298 if (!is_xdp_frame(buf))
4299 dev_kfree_skb(buf);
4300 else
4301 xdp_return_frame(ptr_to_xdp(buf));
4302}
4303
4304static void free_unused_bufs(struct virtnet_info *vi)
4305{
4306 void *buf;
4307 int i;
4308
4309 for (i = 0; i < vi->max_queue_pairs; i++) {
4310 struct virtqueue *vq = vi->sq[i].vq;
4311 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
4312 virtnet_sq_free_unused_buf(vq, buf);
4313 cond_resched();
4314 }
4315
4316 for (i = 0; i < vi->max_queue_pairs; i++) {
4317 struct virtqueue *vq = vi->rq[i].vq;
4318
4319 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
4320 virtnet_rq_unmap_free_buf(vq, buf);
4321 cond_resched();
4322 }
4323}
4324
4325static void virtnet_del_vqs(struct virtnet_info *vi)
4326{
4327 struct virtio_device *vdev = vi->vdev;
4328
4329 virtnet_clean_affinity(vi);
4330
4331 vdev->config->del_vqs(vdev);
4332
4333 virtnet_free_queues(vi);
4334}
4335
4336/* How large should a single buffer be so a queue full of these can fit at
4337 * least one full packet?
4338 * Logic below assumes the mergeable buffer header is used.
4339 */
4340static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
4341{
4342 const unsigned int hdr_len = vi->hdr_len;
4343 unsigned int rq_size = virtqueue_get_vring_size(vq);
4344 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
4345 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
4346 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
4347
4348 return max(max(min_buf_len, hdr_len) - hdr_len,
4349 (unsigned int)GOOD_PACKET_LEN);
4350}
4351
4352static int virtnet_find_vqs(struct virtnet_info *vi)
4353{
4354 vq_callback_t **callbacks;
4355 struct virtqueue **vqs;
4356 const char **names;
4357 int ret = -ENOMEM;
4358 int total_vqs;
4359 bool *ctx;
4360 u16 i;
4361
4362 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
4363 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
4364 * possible control vq.
4365 */
4366 total_vqs = vi->max_queue_pairs * 2 +
4367 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
4368
4369 /* Allocate space for find_vqs parameters */
4370 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
4371 if (!vqs)
4372 goto err_vq;
4373 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
4374 if (!callbacks)
4375 goto err_callback;
4376 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
4377 if (!names)
4378 goto err_names;
4379 if (!vi->big_packets || vi->mergeable_rx_bufs) {
4380 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
4381 if (!ctx)
4382 goto err_ctx;
4383 } else {
4384 ctx = NULL;
4385 }
4386
4387 /* Parameters for control virtqueue, if any */
4388 if (vi->has_cvq) {
4389 callbacks[total_vqs - 1] = NULL;
4390 names[total_vqs - 1] = "control";
4391 }
4392
4393 /* Allocate/initialize parameters for send/receive virtqueues */
4394 for (i = 0; i < vi->max_queue_pairs; i++) {
4395 callbacks[rxq2vq(i)] = skb_recv_done;
4396 callbacks[txq2vq(i)] = skb_xmit_done;
4397 sprintf(vi->rq[i].name, "input.%u", i);
4398 sprintf(vi->sq[i].name, "output.%u", i);
4399 names[rxq2vq(i)] = vi->rq[i].name;
4400 names[txq2vq(i)] = vi->sq[i].name;
4401 if (ctx)
4402 ctx[rxq2vq(i)] = true;
4403 }
4404
4405 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks,
4406 names, ctx, NULL);
4407 if (ret)
4408 goto err_find;
4409
4410 if (vi->has_cvq) {
4411 vi->cvq = vqs[total_vqs - 1];
4412 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
4413 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
4414 }
4415
4416 for (i = 0; i < vi->max_queue_pairs; i++) {
4417 vi->rq[i].vq = vqs[rxq2vq(i)];
4418 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
4419 vi->sq[i].vq = vqs[txq2vq(i)];
4420 }
4421
4422 /* run here: ret == 0. */
4423
4424
4425err_find:
4426 kfree(ctx);
4427err_ctx:
4428 kfree(names);
4429err_names:
4430 kfree(callbacks);
4431err_callback:
4432 kfree(vqs);
4433err_vq:
4434 return ret;
4435}
4436
4437static int virtnet_alloc_queues(struct virtnet_info *vi)
4438{
4439 int i;
4440
4441 if (vi->has_cvq) {
4442 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
4443 if (!vi->ctrl)
4444 goto err_ctrl;
4445 } else {
4446 vi->ctrl = NULL;
4447 }
4448 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
4449 if (!vi->sq)
4450 goto err_sq;
4451 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
4452 if (!vi->rq)
4453 goto err_rq;
4454
4455 INIT_DELAYED_WORK(&vi->refill, refill_work);
4456 for (i = 0; i < vi->max_queue_pairs; i++) {
4457 vi->rq[i].pages = NULL;
4458 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll,
4459 napi_weight);
4460 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi,
4461 virtnet_poll_tx,
4462 napi_tx ? napi_weight : 0);
4463
4464 INIT_WORK(&vi->rq[i].dim.work, virtnet_rx_dim_work);
4465 vi->rq[i].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
4466
4467 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
4468 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
4469 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
4470
4471 u64_stats_init(&vi->rq[i].stats.syncp);
4472 u64_stats_init(&vi->sq[i].stats.syncp);
4473 }
4474
4475 return 0;
4476
4477err_rq:
4478 kfree(vi->sq);
4479err_sq:
4480 kfree(vi->ctrl);
4481err_ctrl:
4482 return -ENOMEM;
4483}
4484
4485static int init_vqs(struct virtnet_info *vi)
4486{
4487 int ret;
4488
4489 /* Allocate send & receive queues */
4490 ret = virtnet_alloc_queues(vi);
4491 if (ret)
4492 goto err;
4493
4494 ret = virtnet_find_vqs(vi);
4495 if (ret)
4496 goto err_free;
4497
4498 virtnet_rq_set_premapped(vi);
4499
4500 cpus_read_lock();
4501 virtnet_set_affinity(vi);
4502 cpus_read_unlock();
4503
4504 return 0;
4505
4506err_free:
4507 virtnet_free_queues(vi);
4508err:
4509 return ret;
4510}
4511
4512#ifdef CONFIG_SYSFS
4513static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
4514 char *buf)
4515{
4516 struct virtnet_info *vi = netdev_priv(queue->dev);
4517 unsigned int queue_index = get_netdev_rx_queue_index(queue);
4518 unsigned int headroom = virtnet_get_headroom(vi);
4519 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
4520 struct ewma_pkt_len *avg;
4521
4522 BUG_ON(queue_index >= vi->max_queue_pairs);
4523 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
4524 return sprintf(buf, "%u\n",
4525 get_mergeable_buf_len(&vi->rq[queue_index], avg,
4526 SKB_DATA_ALIGN(headroom + tailroom)));
4527}
4528
4529static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
4530 __ATTR_RO(mergeable_rx_buffer_size);
4531
4532static struct attribute *virtio_net_mrg_rx_attrs[] = {
4533 &mergeable_rx_buffer_size_attribute.attr,
4534 NULL
4535};
4536
4537static const struct attribute_group virtio_net_mrg_rx_group = {
4538 .name = "virtio_net",
4539 .attrs = virtio_net_mrg_rx_attrs
4540};
4541#endif
4542
4543static bool virtnet_fail_on_feature(struct virtio_device *vdev,
4544 unsigned int fbit,
4545 const char *fname, const char *dname)
4546{
4547 if (!virtio_has_feature(vdev, fbit))
4548 return false;
4549
4550 dev_err(&vdev->dev, "device advertises feature %s but not %s",
4551 fname, dname);
4552
4553 return true;
4554}
4555
4556#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
4557 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
4558
4559static bool virtnet_validate_features(struct virtio_device *vdev)
4560{
4561 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
4562 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
4563 "VIRTIO_NET_F_CTRL_VQ") ||
4564 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
4565 "VIRTIO_NET_F_CTRL_VQ") ||
4566 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
4567 "VIRTIO_NET_F_CTRL_VQ") ||
4568 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
4569 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
4570 "VIRTIO_NET_F_CTRL_VQ") ||
4571 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS,
4572 "VIRTIO_NET_F_CTRL_VQ") ||
4573 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
4574 "VIRTIO_NET_F_CTRL_VQ") ||
4575 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL,
4576 "VIRTIO_NET_F_CTRL_VQ") ||
4577 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_VQ_NOTF_COAL,
4578 "VIRTIO_NET_F_CTRL_VQ"))) {
4579 return false;
4580 }
4581
4582 return true;
4583}
4584
4585#define MIN_MTU ETH_MIN_MTU
4586#define MAX_MTU ETH_MAX_MTU
4587
4588static int virtnet_validate(struct virtio_device *vdev)
4589{
4590 if (!vdev->config->get) {
4591 dev_err(&vdev->dev, "%s failure: config access disabled\n",
4592 __func__);
4593 return -EINVAL;
4594 }
4595
4596 if (!virtnet_validate_features(vdev))
4597 return -EINVAL;
4598
4599 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
4600 int mtu = virtio_cread16(vdev,
4601 offsetof(struct virtio_net_config,
4602 mtu));
4603 if (mtu < MIN_MTU)
4604 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
4605 }
4606
4607 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) &&
4608 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
4609 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby");
4610 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY);
4611 }
4612
4613 return 0;
4614}
4615
4616static bool virtnet_check_guest_gso(const struct virtnet_info *vi)
4617{
4618 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
4619 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
4620 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
4621 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
4622 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) &&
4623 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6));
4624}
4625
4626static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu)
4627{
4628 bool guest_gso = virtnet_check_guest_gso(vi);
4629
4630 /* If device can receive ANY guest GSO packets, regardless of mtu,
4631 * allocate packets of maximum size, otherwise limit it to only
4632 * mtu size worth only.
4633 */
4634 if (mtu > ETH_DATA_LEN || guest_gso) {
4635 vi->big_packets = true;
4636 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE);
4637 }
4638}
4639
4640static int virtnet_probe(struct virtio_device *vdev)
4641{
4642 int i, err = -ENOMEM;
4643 struct net_device *dev;
4644 struct virtnet_info *vi;
4645 u16 max_queue_pairs;
4646 int mtu = 0;
4647
4648 /* Find if host supports multiqueue/rss virtio_net device */
4649 max_queue_pairs = 1;
4650 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
4651 max_queue_pairs =
4652 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs));
4653
4654 /* We need at least 2 queue's */
4655 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
4656 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
4657 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
4658 max_queue_pairs = 1;
4659
4660 /* Allocate ourselves a network device with room for our info */
4661 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
4662 if (!dev)
4663 return -ENOMEM;
4664
4665 /* Set up network device as normal. */
4666 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
4667 IFF_TX_SKB_NO_LINEAR;
4668 dev->netdev_ops = &virtnet_netdev;
4669 dev->features = NETIF_F_HIGHDMA;
4670
4671 dev->ethtool_ops = &virtnet_ethtool_ops;
4672 SET_NETDEV_DEV(dev, &vdev->dev);
4673
4674 /* Do we support "hardware" checksums? */
4675 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
4676 /* This opens up the world of extra features. */
4677 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
4678 if (csum)
4679 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
4680
4681 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
4682 dev->hw_features |= NETIF_F_TSO
4683 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
4684 }
4685 /* Individual feature bits: what can host handle? */
4686 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
4687 dev->hw_features |= NETIF_F_TSO;
4688 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
4689 dev->hw_features |= NETIF_F_TSO6;
4690 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
4691 dev->hw_features |= NETIF_F_TSO_ECN;
4692 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO))
4693 dev->hw_features |= NETIF_F_GSO_UDP_L4;
4694
4695 dev->features |= NETIF_F_GSO_ROBUST;
4696
4697 if (gso)
4698 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
4699 /* (!csum && gso) case will be fixed by register_netdev() */
4700 }
4701 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
4702 dev->features |= NETIF_F_RXCSUM;
4703 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
4704 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
4705 dev->features |= NETIF_F_GRO_HW;
4706 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
4707 dev->hw_features |= NETIF_F_GRO_HW;
4708
4709 dev->vlan_features = dev->features;
4710 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT;
4711
4712 /* MTU range: 68 - 65535 */
4713 dev->min_mtu = MIN_MTU;
4714 dev->max_mtu = MAX_MTU;
4715
4716 /* Configuration may specify what MAC to use. Otherwise random. */
4717 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
4718 u8 addr[ETH_ALEN];
4719
4720 virtio_cread_bytes(vdev,
4721 offsetof(struct virtio_net_config, mac),
4722 addr, ETH_ALEN);
4723 eth_hw_addr_set(dev, addr);
4724 } else {
4725 eth_hw_addr_random(dev);
4726 dev_info(&vdev->dev, "Assigned random MAC address %pM\n",
4727 dev->dev_addr);
4728 }
4729
4730 /* Set up our device-specific information */
4731 vi = netdev_priv(dev);
4732 vi->dev = dev;
4733 vi->vdev = vdev;
4734 vdev->priv = vi;
4735
4736 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
4737 INIT_WORK(&vi->rx_mode_work, virtnet_rx_mode_work);
4738 spin_lock_init(&vi->refill_lock);
4739
4740 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) {
4741 vi->mergeable_rx_bufs = true;
4742 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG;
4743 }
4744
4745 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT))
4746 vi->has_rss_hash_report = true;
4747
4748 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
4749 vi->has_rss = true;
4750
4751 vi->rss_indir_table_size =
4752 virtio_cread16(vdev, offsetof(struct virtio_net_config,
4753 rss_max_indirection_table_length));
4754 }
4755
4756 if (vi->has_rss || vi->has_rss_hash_report) {
4757 vi->rss_key_size =
4758 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
4759
4760 vi->rss_hash_types_supported =
4761 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
4762 vi->rss_hash_types_supported &=
4763 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX |
4764 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
4765 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX);
4766
4767 dev->hw_features |= NETIF_F_RXHASH;
4768 }
4769
4770 if (vi->has_rss_hash_report)
4771 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
4772 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
4773 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
4774 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
4775 else
4776 vi->hdr_len = sizeof(struct virtio_net_hdr);
4777
4778 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
4779 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
4780 vi->any_header_sg = true;
4781
4782 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
4783 vi->has_cvq = true;
4784
4785 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
4786 mtu = virtio_cread16(vdev,
4787 offsetof(struct virtio_net_config,
4788 mtu));
4789 if (mtu < dev->min_mtu) {
4790 /* Should never trigger: MTU was previously validated
4791 * in virtnet_validate.
4792 */
4793 dev_err(&vdev->dev,
4794 "device MTU appears to have changed it is now %d < %d",
4795 mtu, dev->min_mtu);
4796 err = -EINVAL;
4797 goto free;
4798 }
4799
4800 dev->mtu = mtu;
4801 dev->max_mtu = mtu;
4802 }
4803
4804 virtnet_set_big_packets(vi, mtu);
4805
4806 if (vi->any_header_sg)
4807 dev->needed_headroom = vi->hdr_len;
4808
4809 /* Enable multiqueue by default */
4810 if (num_online_cpus() >= max_queue_pairs)
4811 vi->curr_queue_pairs = max_queue_pairs;
4812 else
4813 vi->curr_queue_pairs = num_online_cpus();
4814 vi->max_queue_pairs = max_queue_pairs;
4815
4816 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
4817 err = init_vqs(vi);
4818 if (err)
4819 goto free;
4820
4821 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
4822 vi->intr_coal_rx.max_usecs = 0;
4823 vi->intr_coal_tx.max_usecs = 0;
4824 vi->intr_coal_rx.max_packets = 0;
4825
4826 /* Keep the default values of the coalescing parameters
4827 * aligned with the default napi_tx state.
4828 */
4829 if (vi->sq[0].napi.weight)
4830 vi->intr_coal_tx.max_packets = 1;
4831 else
4832 vi->intr_coal_tx.max_packets = 0;
4833 }
4834
4835 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
4836 /* The reason is the same as VIRTIO_NET_F_NOTF_COAL. */
4837 for (i = 0; i < vi->max_queue_pairs; i++)
4838 if (vi->sq[i].napi.weight)
4839 vi->sq[i].intr_coal.max_packets = 1;
4840 }
4841
4842#ifdef CONFIG_SYSFS
4843 if (vi->mergeable_rx_bufs)
4844 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
4845#endif
4846 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
4847 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
4848
4849 virtnet_init_settings(dev);
4850
4851 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
4852 vi->failover = net_failover_create(vi->dev);
4853 if (IS_ERR(vi->failover)) {
4854 err = PTR_ERR(vi->failover);
4855 goto free_vqs;
4856 }
4857 }
4858
4859 if (vi->has_rss || vi->has_rss_hash_report)
4860 virtnet_init_default_rss(vi);
4861
4862 enable_rx_mode_work(vi);
4863
4864 /* serialize netdev register + virtio_device_ready() with ndo_open() */
4865 rtnl_lock();
4866
4867 err = register_netdevice(dev);
4868 if (err) {
4869 pr_debug("virtio_net: registering device failed\n");
4870 rtnl_unlock();
4871 goto free_failover;
4872 }
4873
4874 virtio_device_ready(vdev);
4875
4876 _virtnet_set_queues(vi, vi->curr_queue_pairs);
4877
4878 /* a random MAC address has been assigned, notify the device.
4879 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there
4880 * because many devices work fine without getting MAC explicitly
4881 */
4882 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
4883 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
4884 struct scatterlist sg;
4885
4886 sg_init_one(&sg, dev->dev_addr, dev->addr_len);
4887 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
4888 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
4889 pr_debug("virtio_net: setting MAC address failed\n");
4890 rtnl_unlock();
4891 err = -EINVAL;
4892 goto free_unregister_netdev;
4893 }
4894 }
4895
4896 rtnl_unlock();
4897
4898 err = virtnet_cpu_notif_add(vi);
4899 if (err) {
4900 pr_debug("virtio_net: registering cpu notifier failed\n");
4901 goto free_unregister_netdev;
4902 }
4903
4904 /* Assume link up if device can't report link status,
4905 otherwise get link status from config. */
4906 netif_carrier_off(dev);
4907 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
4908 schedule_work(&vi->config_work);
4909 } else {
4910 vi->status = VIRTIO_NET_S_LINK_UP;
4911 virtnet_update_settings(vi);
4912 netif_carrier_on(dev);
4913 }
4914
4915 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
4916 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
4917 set_bit(guest_offloads[i], &vi->guest_offloads);
4918 vi->guest_offloads_capable = vi->guest_offloads;
4919
4920 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
4921 dev->name, max_queue_pairs);
4922
4923 return 0;
4924
4925free_unregister_netdev:
4926 unregister_netdev(dev);
4927free_failover:
4928 net_failover_destroy(vi->failover);
4929free_vqs:
4930 virtio_reset_device(vdev);
4931 cancel_delayed_work_sync(&vi->refill);
4932 free_receive_page_frags(vi);
4933 virtnet_del_vqs(vi);
4934free:
4935 free_netdev(dev);
4936 return err;
4937}
4938
4939static void remove_vq_common(struct virtnet_info *vi)
4940{
4941 virtio_reset_device(vi->vdev);
4942
4943 /* Free unused buffers in both send and recv, if any. */
4944 free_unused_bufs(vi);
4945
4946 free_receive_bufs(vi);
4947
4948 free_receive_page_frags(vi);
4949
4950 virtnet_del_vqs(vi);
4951}
4952
4953static void virtnet_remove(struct virtio_device *vdev)
4954{
4955 struct virtnet_info *vi = vdev->priv;
4956
4957 virtnet_cpu_notif_remove(vi);
4958
4959 /* Make sure no work handler is accessing the device. */
4960 flush_work(&vi->config_work);
4961 disable_rx_mode_work(vi);
4962 flush_work(&vi->rx_mode_work);
4963
4964 unregister_netdev(vi->dev);
4965
4966 net_failover_destroy(vi->failover);
4967
4968 remove_vq_common(vi);
4969
4970 free_netdev(vi->dev);
4971}
4972
4973static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
4974{
4975 struct virtnet_info *vi = vdev->priv;
4976
4977 virtnet_cpu_notif_remove(vi);
4978 virtnet_freeze_down(vdev);
4979 remove_vq_common(vi);
4980
4981 return 0;
4982}
4983
4984static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
4985{
4986 struct virtnet_info *vi = vdev->priv;
4987 int err;
4988
4989 err = virtnet_restore_up(vdev);
4990 if (err)
4991 return err;
4992 virtnet_set_queues(vi, vi->curr_queue_pairs);
4993
4994 err = virtnet_cpu_notif_add(vi);
4995 if (err) {
4996 virtnet_freeze_down(vdev);
4997 remove_vq_common(vi);
4998 return err;
4999 }
5000
5001 return 0;
5002}
5003
5004static struct virtio_device_id id_table[] = {
5005 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
5006 { 0 },
5007};
5008
5009#define VIRTNET_FEATURES \
5010 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
5011 VIRTIO_NET_F_MAC, \
5012 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
5013 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
5014 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
5015 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \
5016 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
5017 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
5018 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
5019 VIRTIO_NET_F_CTRL_MAC_ADDR, \
5020 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
5021 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
5022 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \
5023 VIRTIO_NET_F_VQ_NOTF_COAL, \
5024 VIRTIO_NET_F_GUEST_HDRLEN
5025
5026static unsigned int features[] = {
5027 VIRTNET_FEATURES,
5028};
5029
5030static unsigned int features_legacy[] = {
5031 VIRTNET_FEATURES,
5032 VIRTIO_NET_F_GSO,
5033 VIRTIO_F_ANY_LAYOUT,
5034};
5035
5036static struct virtio_driver virtio_net_driver = {
5037 .feature_table = features,
5038 .feature_table_size = ARRAY_SIZE(features),
5039 .feature_table_legacy = features_legacy,
5040 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
5041 .driver.name = KBUILD_MODNAME,
5042 .driver.owner = THIS_MODULE,
5043 .id_table = id_table,
5044 .validate = virtnet_validate,
5045 .probe = virtnet_probe,
5046 .remove = virtnet_remove,
5047 .config_changed = virtnet_config_changed,
5048#ifdef CONFIG_PM_SLEEP
5049 .freeze = virtnet_freeze,
5050 .restore = virtnet_restore,
5051#endif
5052};
5053
5054static __init int virtio_net_driver_init(void)
5055{
5056 int ret;
5057
5058 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
5059 virtnet_cpu_online,
5060 virtnet_cpu_down_prep);
5061 if (ret < 0)
5062 goto out;
5063 virtionet_online = ret;
5064 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
5065 NULL, virtnet_cpu_dead);
5066 if (ret)
5067 goto err_dead;
5068 ret = register_virtio_driver(&virtio_net_driver);
5069 if (ret)
5070 goto err_virtio;
5071 return 0;
5072err_virtio:
5073 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
5074err_dead:
5075 cpuhp_remove_multi_state(virtionet_online);
5076out:
5077 return ret;
5078}
5079module_init(virtio_net_driver_init);
5080
5081static __exit void virtio_net_driver_exit(void)
5082{
5083 unregister_virtio_driver(&virtio_net_driver);
5084 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
5085 cpuhp_remove_multi_state(virtionet_online);
5086}
5087module_exit(virtio_net_driver_exit);
5088
5089MODULE_DEVICE_TABLE(virtio, id_table);
5090MODULE_DESCRIPTION("Virtio network driver");
5091MODULE_LICENSE("GPL");
1/* A network driver using virtio.
2 *
3 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18//#define DEBUG
19#include <linux/netdevice.h>
20#include <linux/etherdevice.h>
21#include <linux/ethtool.h>
22#include <linux/module.h>
23#include <linux/virtio.h>
24#include <linux/virtio_net.h>
25#include <linux/scatterlist.h>
26#include <linux/if_vlan.h>
27#include <linux/slab.h>
28#include <linux/cpu.h>
29#include <linux/average.h>
30#include <net/busy_poll.h>
31
32static int napi_weight = NAPI_POLL_WEIGHT;
33module_param(napi_weight, int, 0444);
34
35static bool csum = true, gso = true;
36module_param(csum, bool, 0444);
37module_param(gso, bool, 0444);
38
39/* FIXME: MTU in config. */
40#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
41#define GOOD_COPY_LEN 128
42
43/* RX packet size EWMA. The average packet size is used to determine the packet
44 * buffer size when refilling RX rings. As the entire RX ring may be refilled
45 * at once, the weight is chosen so that the EWMA will be insensitive to short-
46 * term, transient changes in packet size.
47 */
48DECLARE_EWMA(pkt_len, 1, 64)
49
50/* Minimum alignment for mergeable packet buffers. */
51#define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256)
52
53#define VIRTNET_DRIVER_VERSION "1.0.0"
54
55struct virtnet_stats {
56 struct u64_stats_sync tx_syncp;
57 struct u64_stats_sync rx_syncp;
58 u64 tx_bytes;
59 u64 tx_packets;
60
61 u64 rx_bytes;
62 u64 rx_packets;
63};
64
65/* Internal representation of a send virtqueue */
66struct send_queue {
67 /* Virtqueue associated with this send _queue */
68 struct virtqueue *vq;
69
70 /* TX: fragments + linear part + virtio header */
71 struct scatterlist sg[MAX_SKB_FRAGS + 2];
72
73 /* Name of the send queue: output.$index */
74 char name[40];
75};
76
77/* Internal representation of a receive virtqueue */
78struct receive_queue {
79 /* Virtqueue associated with this receive_queue */
80 struct virtqueue *vq;
81
82 struct napi_struct napi;
83
84 /* Chain pages by the private ptr. */
85 struct page *pages;
86
87 /* Average packet length for mergeable receive buffers. */
88 struct ewma_pkt_len mrg_avg_pkt_len;
89
90 /* Page frag for packet buffer allocation. */
91 struct page_frag alloc_frag;
92
93 /* RX: fragments + linear part + virtio header */
94 struct scatterlist sg[MAX_SKB_FRAGS + 2];
95
96 /* Name of this receive queue: input.$index */
97 char name[40];
98};
99
100struct virtnet_info {
101 struct virtio_device *vdev;
102 struct virtqueue *cvq;
103 struct net_device *dev;
104 struct send_queue *sq;
105 struct receive_queue *rq;
106 unsigned int status;
107
108 /* Max # of queue pairs supported by the device */
109 u16 max_queue_pairs;
110
111 /* # of queue pairs currently used by the driver */
112 u16 curr_queue_pairs;
113
114 /* I like... big packets and I cannot lie! */
115 bool big_packets;
116
117 /* Host will merge rx buffers for big packets (shake it! shake it!) */
118 bool mergeable_rx_bufs;
119
120 /* Has control virtqueue */
121 bool has_cvq;
122
123 /* Host can handle any s/g split between our header and packet data */
124 bool any_header_sg;
125
126 /* Packet virtio header size */
127 u8 hdr_len;
128
129 /* Active statistics */
130 struct virtnet_stats __percpu *stats;
131
132 /* Work struct for refilling if we run low on memory. */
133 struct delayed_work refill;
134
135 /* Work struct for config space updates */
136 struct work_struct config_work;
137
138 /* Does the affinity hint is set for virtqueues? */
139 bool affinity_hint_set;
140
141 /* CPU hot plug notifier */
142 struct notifier_block nb;
143
144 /* Control VQ buffers: protected by the rtnl lock */
145 struct virtio_net_ctrl_hdr ctrl_hdr;
146 virtio_net_ctrl_ack ctrl_status;
147 u8 ctrl_promisc;
148 u8 ctrl_allmulti;
149
150 /* Ethtool settings */
151 u8 duplex;
152 u32 speed;
153};
154
155struct padded_vnet_hdr {
156 struct virtio_net_hdr_mrg_rxbuf hdr;
157 /*
158 * hdr is in a separate sg buffer, and data sg buffer shares same page
159 * with this header sg. This padding makes next sg 16 byte aligned
160 * after the header.
161 */
162 char padding[4];
163};
164
165/* Converting between virtqueue no. and kernel tx/rx queue no.
166 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
167 */
168static int vq2txq(struct virtqueue *vq)
169{
170 return (vq->index - 1) / 2;
171}
172
173static int txq2vq(int txq)
174{
175 return txq * 2 + 1;
176}
177
178static int vq2rxq(struct virtqueue *vq)
179{
180 return vq->index / 2;
181}
182
183static int rxq2vq(int rxq)
184{
185 return rxq * 2;
186}
187
188static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
189{
190 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
191}
192
193/*
194 * private is used to chain pages for big packets, put the whole
195 * most recent used list in the beginning for reuse
196 */
197static void give_pages(struct receive_queue *rq, struct page *page)
198{
199 struct page *end;
200
201 /* Find end of list, sew whole thing into vi->rq.pages. */
202 for (end = page; end->private; end = (struct page *)end->private);
203 end->private = (unsigned long)rq->pages;
204 rq->pages = page;
205}
206
207static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
208{
209 struct page *p = rq->pages;
210
211 if (p) {
212 rq->pages = (struct page *)p->private;
213 /* clear private here, it is used to chain pages */
214 p->private = 0;
215 } else
216 p = alloc_page(gfp_mask);
217 return p;
218}
219
220static void skb_xmit_done(struct virtqueue *vq)
221{
222 struct virtnet_info *vi = vq->vdev->priv;
223
224 /* Suppress further interrupts. */
225 virtqueue_disable_cb(vq);
226
227 /* We were probably waiting for more output buffers. */
228 netif_wake_subqueue(vi->dev, vq2txq(vq));
229}
230
231static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx)
232{
233 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1);
234 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN;
235}
236
237static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx)
238{
239 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN);
240
241}
242
243static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize)
244{
245 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN;
246 return (unsigned long)buf | (size - 1);
247}
248
249/* Called from bottom half context */
250static struct sk_buff *page_to_skb(struct virtnet_info *vi,
251 struct receive_queue *rq,
252 struct page *page, unsigned int offset,
253 unsigned int len, unsigned int truesize)
254{
255 struct sk_buff *skb;
256 struct virtio_net_hdr_mrg_rxbuf *hdr;
257 unsigned int copy, hdr_len, hdr_padded_len;
258 char *p;
259
260 p = page_address(page) + offset;
261
262 /* copy small packet so we can reuse these pages for small data */
263 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
264 if (unlikely(!skb))
265 return NULL;
266
267 hdr = skb_vnet_hdr(skb);
268
269 hdr_len = vi->hdr_len;
270 if (vi->mergeable_rx_bufs)
271 hdr_padded_len = sizeof *hdr;
272 else
273 hdr_padded_len = sizeof(struct padded_vnet_hdr);
274
275 memcpy(hdr, p, hdr_len);
276
277 len -= hdr_len;
278 offset += hdr_padded_len;
279 p += hdr_padded_len;
280
281 copy = len;
282 if (copy > skb_tailroom(skb))
283 copy = skb_tailroom(skb);
284 memcpy(skb_put(skb, copy), p, copy);
285
286 len -= copy;
287 offset += copy;
288
289 if (vi->mergeable_rx_bufs) {
290 if (len)
291 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
292 else
293 put_page(page);
294 return skb;
295 }
296
297 /*
298 * Verify that we can indeed put this data into a skb.
299 * This is here to handle cases when the device erroneously
300 * tries to receive more than is possible. This is usually
301 * the case of a broken device.
302 */
303 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
304 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
305 dev_kfree_skb(skb);
306 return NULL;
307 }
308 BUG_ON(offset >= PAGE_SIZE);
309 while (len) {
310 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
311 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
312 frag_size, truesize);
313 len -= frag_size;
314 page = (struct page *)page->private;
315 offset = 0;
316 }
317
318 if (page)
319 give_pages(rq, page);
320
321 return skb;
322}
323
324static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len)
325{
326 struct sk_buff * skb = buf;
327
328 len -= vi->hdr_len;
329 skb_trim(skb, len);
330
331 return skb;
332}
333
334static struct sk_buff *receive_big(struct net_device *dev,
335 struct virtnet_info *vi,
336 struct receive_queue *rq,
337 void *buf,
338 unsigned int len)
339{
340 struct page *page = buf;
341 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
342
343 if (unlikely(!skb))
344 goto err;
345
346 return skb;
347
348err:
349 dev->stats.rx_dropped++;
350 give_pages(rq, page);
351 return NULL;
352}
353
354static struct sk_buff *receive_mergeable(struct net_device *dev,
355 struct virtnet_info *vi,
356 struct receive_queue *rq,
357 unsigned long ctx,
358 unsigned int len)
359{
360 void *buf = mergeable_ctx_to_buf_address(ctx);
361 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
362 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
363 struct page *page = virt_to_head_page(buf);
364 int offset = buf - page_address(page);
365 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
366
367 struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len,
368 truesize);
369 struct sk_buff *curr_skb = head_skb;
370
371 if (unlikely(!curr_skb))
372 goto err_skb;
373 while (--num_buf) {
374 int num_skb_frags;
375
376 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
377 if (unlikely(!ctx)) {
378 pr_debug("%s: rx error: %d buffers out of %d missing\n",
379 dev->name, num_buf,
380 virtio16_to_cpu(vi->vdev,
381 hdr->num_buffers));
382 dev->stats.rx_length_errors++;
383 goto err_buf;
384 }
385
386 buf = mergeable_ctx_to_buf_address(ctx);
387 page = virt_to_head_page(buf);
388
389 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
390 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
391 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
392
393 if (unlikely(!nskb))
394 goto err_skb;
395 if (curr_skb == head_skb)
396 skb_shinfo(curr_skb)->frag_list = nskb;
397 else
398 curr_skb->next = nskb;
399 curr_skb = nskb;
400 head_skb->truesize += nskb->truesize;
401 num_skb_frags = 0;
402 }
403 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
404 if (curr_skb != head_skb) {
405 head_skb->data_len += len;
406 head_skb->len += len;
407 head_skb->truesize += truesize;
408 }
409 offset = buf - page_address(page);
410 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
411 put_page(page);
412 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
413 len, truesize);
414 } else {
415 skb_add_rx_frag(curr_skb, num_skb_frags, page,
416 offset, len, truesize);
417 }
418 }
419
420 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
421 return head_skb;
422
423err_skb:
424 put_page(page);
425 while (--num_buf) {
426 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
427 if (unlikely(!ctx)) {
428 pr_debug("%s: rx error: %d buffers missing\n",
429 dev->name, num_buf);
430 dev->stats.rx_length_errors++;
431 break;
432 }
433 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
434 put_page(page);
435 }
436err_buf:
437 dev->stats.rx_dropped++;
438 dev_kfree_skb(head_skb);
439 return NULL;
440}
441
442static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
443 void *buf, unsigned int len)
444{
445 struct net_device *dev = vi->dev;
446 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
447 struct sk_buff *skb;
448 struct virtio_net_hdr_mrg_rxbuf *hdr;
449
450 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
451 pr_debug("%s: short packet %i\n", dev->name, len);
452 dev->stats.rx_length_errors++;
453 if (vi->mergeable_rx_bufs) {
454 unsigned long ctx = (unsigned long)buf;
455 void *base = mergeable_ctx_to_buf_address(ctx);
456 put_page(virt_to_head_page(base));
457 } else if (vi->big_packets) {
458 give_pages(rq, buf);
459 } else {
460 dev_kfree_skb(buf);
461 }
462 return;
463 }
464
465 if (vi->mergeable_rx_bufs)
466 skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
467 else if (vi->big_packets)
468 skb = receive_big(dev, vi, rq, buf, len);
469 else
470 skb = receive_small(vi, buf, len);
471
472 if (unlikely(!skb))
473 return;
474
475 hdr = skb_vnet_hdr(skb);
476
477 u64_stats_update_begin(&stats->rx_syncp);
478 stats->rx_bytes += skb->len;
479 stats->rx_packets++;
480 u64_stats_update_end(&stats->rx_syncp);
481
482 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
483 pr_debug("Needs csum!\n");
484 if (!skb_partial_csum_set(skb,
485 virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start),
486 virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset)))
487 goto frame_err;
488 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
489 skb->ip_summed = CHECKSUM_UNNECESSARY;
490 }
491
492 skb->protocol = eth_type_trans(skb, dev);
493 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
494 ntohs(skb->protocol), skb->len, skb->pkt_type);
495
496 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
497 pr_debug("GSO!\n");
498 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
499 case VIRTIO_NET_HDR_GSO_TCPV4:
500 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
501 break;
502 case VIRTIO_NET_HDR_GSO_UDP:
503 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
504 break;
505 case VIRTIO_NET_HDR_GSO_TCPV6:
506 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
507 break;
508 default:
509 net_warn_ratelimited("%s: bad gso type %u.\n",
510 dev->name, hdr->hdr.gso_type);
511 goto frame_err;
512 }
513
514 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
515 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
516
517 skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev,
518 hdr->hdr.gso_size);
519 if (skb_shinfo(skb)->gso_size == 0) {
520 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
521 goto frame_err;
522 }
523
524 /* Header must be checked, and gso_segs computed. */
525 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
526 skb_shinfo(skb)->gso_segs = 0;
527 }
528
529 napi_gro_receive(&rq->napi, skb);
530 return;
531
532frame_err:
533 dev->stats.rx_frame_errors++;
534 dev_kfree_skb(skb);
535}
536
537static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
538 gfp_t gfp)
539{
540 struct sk_buff *skb;
541 struct virtio_net_hdr_mrg_rxbuf *hdr;
542 int err;
543
544 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
545 if (unlikely(!skb))
546 return -ENOMEM;
547
548 skb_put(skb, GOOD_PACKET_LEN);
549
550 hdr = skb_vnet_hdr(skb);
551 sg_init_table(rq->sg, 2);
552 sg_set_buf(rq->sg, hdr, vi->hdr_len);
553 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
554
555 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
556 if (err < 0)
557 dev_kfree_skb(skb);
558
559 return err;
560}
561
562static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
563 gfp_t gfp)
564{
565 struct page *first, *list = NULL;
566 char *p;
567 int i, err, offset;
568
569 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
570
571 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
572 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
573 first = get_a_page(rq, gfp);
574 if (!first) {
575 if (list)
576 give_pages(rq, list);
577 return -ENOMEM;
578 }
579 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
580
581 /* chain new page in list head to match sg */
582 first->private = (unsigned long)list;
583 list = first;
584 }
585
586 first = get_a_page(rq, gfp);
587 if (!first) {
588 give_pages(rq, list);
589 return -ENOMEM;
590 }
591 p = page_address(first);
592
593 /* rq->sg[0], rq->sg[1] share the same page */
594 /* a separated rq->sg[0] for header - required in case !any_header_sg */
595 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
596
597 /* rq->sg[1] for data packet, from offset */
598 offset = sizeof(struct padded_vnet_hdr);
599 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
600
601 /* chain first in list head */
602 first->private = (unsigned long)list;
603 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
604 first, gfp);
605 if (err < 0)
606 give_pages(rq, first);
607
608 return err;
609}
610
611static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len)
612{
613 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
614 unsigned int len;
615
616 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
617 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
618 return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
619}
620
621static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
622{
623 struct page_frag *alloc_frag = &rq->alloc_frag;
624 char *buf;
625 unsigned long ctx;
626 int err;
627 unsigned int len, hole;
628
629 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
630 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
631 return -ENOMEM;
632
633 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
634 ctx = mergeable_buf_to_ctx(buf, len);
635 get_page(alloc_frag->page);
636 alloc_frag->offset += len;
637 hole = alloc_frag->size - alloc_frag->offset;
638 if (hole < len) {
639 /* To avoid internal fragmentation, if there is very likely not
640 * enough space for another buffer, add the remaining space to
641 * the current buffer. This extra space is not included in
642 * the truesize stored in ctx.
643 */
644 len += hole;
645 alloc_frag->offset += hole;
646 }
647
648 sg_init_one(rq->sg, buf, len);
649 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
650 if (err < 0)
651 put_page(virt_to_head_page(buf));
652
653 return err;
654}
655
656/*
657 * Returns false if we couldn't fill entirely (OOM).
658 *
659 * Normally run in the receive path, but can also be run from ndo_open
660 * before we're receiving packets, or from refill_work which is
661 * careful to disable receiving (using napi_disable).
662 */
663static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
664 gfp_t gfp)
665{
666 int err;
667 bool oom;
668
669 gfp |= __GFP_COLD;
670 do {
671 if (vi->mergeable_rx_bufs)
672 err = add_recvbuf_mergeable(rq, gfp);
673 else if (vi->big_packets)
674 err = add_recvbuf_big(vi, rq, gfp);
675 else
676 err = add_recvbuf_small(vi, rq, gfp);
677
678 oom = err == -ENOMEM;
679 if (err)
680 break;
681 } while (rq->vq->num_free);
682 virtqueue_kick(rq->vq);
683 return !oom;
684}
685
686static void skb_recv_done(struct virtqueue *rvq)
687{
688 struct virtnet_info *vi = rvq->vdev->priv;
689 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
690
691 /* Schedule NAPI, Suppress further interrupts if successful. */
692 if (napi_schedule_prep(&rq->napi)) {
693 virtqueue_disable_cb(rvq);
694 __napi_schedule(&rq->napi);
695 }
696}
697
698static void virtnet_napi_enable(struct receive_queue *rq)
699{
700 napi_enable(&rq->napi);
701
702 /* If all buffers were filled by other side before we napi_enabled, we
703 * won't get another interrupt, so process any outstanding packets
704 * now. virtnet_poll wants re-enable the queue, so we disable here.
705 * We synchronize against interrupts via NAPI_STATE_SCHED */
706 if (napi_schedule_prep(&rq->napi)) {
707 virtqueue_disable_cb(rq->vq);
708 local_bh_disable();
709 __napi_schedule(&rq->napi);
710 local_bh_enable();
711 }
712}
713
714static void refill_work(struct work_struct *work)
715{
716 struct virtnet_info *vi =
717 container_of(work, struct virtnet_info, refill.work);
718 bool still_empty;
719 int i;
720
721 for (i = 0; i < vi->curr_queue_pairs; i++) {
722 struct receive_queue *rq = &vi->rq[i];
723
724 napi_disable(&rq->napi);
725 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
726 virtnet_napi_enable(rq);
727
728 /* In theory, this can happen: if we don't get any buffers in
729 * we will *never* try to fill again.
730 */
731 if (still_empty)
732 schedule_delayed_work(&vi->refill, HZ/2);
733 }
734}
735
736static int virtnet_receive(struct receive_queue *rq, int budget)
737{
738 struct virtnet_info *vi = rq->vq->vdev->priv;
739 unsigned int len, received = 0;
740 void *buf;
741
742 while (received < budget &&
743 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
744 receive_buf(vi, rq, buf, len);
745 received++;
746 }
747
748 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
749 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
750 schedule_delayed_work(&vi->refill, 0);
751 }
752
753 return received;
754}
755
756static int virtnet_poll(struct napi_struct *napi, int budget)
757{
758 struct receive_queue *rq =
759 container_of(napi, struct receive_queue, napi);
760 unsigned int r, received;
761
762 received = virtnet_receive(rq, budget);
763
764 /* Out of packets? */
765 if (received < budget) {
766 r = virtqueue_enable_cb_prepare(rq->vq);
767 napi_complete_done(napi, received);
768 if (unlikely(virtqueue_poll(rq->vq, r)) &&
769 napi_schedule_prep(napi)) {
770 virtqueue_disable_cb(rq->vq);
771 __napi_schedule(napi);
772 }
773 }
774
775 return received;
776}
777
778#ifdef CONFIG_NET_RX_BUSY_POLL
779/* must be called with local_bh_disable()d */
780static int virtnet_busy_poll(struct napi_struct *napi)
781{
782 struct receive_queue *rq =
783 container_of(napi, struct receive_queue, napi);
784 struct virtnet_info *vi = rq->vq->vdev->priv;
785 int r, received = 0, budget = 4;
786
787 if (!(vi->status & VIRTIO_NET_S_LINK_UP))
788 return LL_FLUSH_FAILED;
789
790 if (!napi_schedule_prep(napi))
791 return LL_FLUSH_BUSY;
792
793 virtqueue_disable_cb(rq->vq);
794
795again:
796 received += virtnet_receive(rq, budget);
797
798 r = virtqueue_enable_cb_prepare(rq->vq);
799 clear_bit(NAPI_STATE_SCHED, &napi->state);
800 if (unlikely(virtqueue_poll(rq->vq, r)) &&
801 napi_schedule_prep(napi)) {
802 virtqueue_disable_cb(rq->vq);
803 if (received < budget) {
804 budget -= received;
805 goto again;
806 } else {
807 __napi_schedule(napi);
808 }
809 }
810
811 return received;
812}
813#endif /* CONFIG_NET_RX_BUSY_POLL */
814
815static int virtnet_open(struct net_device *dev)
816{
817 struct virtnet_info *vi = netdev_priv(dev);
818 int i;
819
820 for (i = 0; i < vi->max_queue_pairs; i++) {
821 if (i < vi->curr_queue_pairs)
822 /* Make sure we have some buffers: if oom use wq. */
823 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
824 schedule_delayed_work(&vi->refill, 0);
825 virtnet_napi_enable(&vi->rq[i]);
826 }
827
828 return 0;
829}
830
831static void free_old_xmit_skbs(struct send_queue *sq)
832{
833 struct sk_buff *skb;
834 unsigned int len;
835 struct virtnet_info *vi = sq->vq->vdev->priv;
836 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
837
838 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
839 pr_debug("Sent skb %p\n", skb);
840
841 u64_stats_update_begin(&stats->tx_syncp);
842 stats->tx_bytes += skb->len;
843 stats->tx_packets++;
844 u64_stats_update_end(&stats->tx_syncp);
845
846 dev_kfree_skb_any(skb);
847 }
848}
849
850static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
851{
852 struct virtio_net_hdr_mrg_rxbuf *hdr;
853 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
854 struct virtnet_info *vi = sq->vq->vdev->priv;
855 unsigned num_sg;
856 unsigned hdr_len = vi->hdr_len;
857 bool can_push;
858
859 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
860
861 can_push = vi->any_header_sg &&
862 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
863 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
864 /* Even if we can, don't push here yet as this would skew
865 * csum_start offset below. */
866 if (can_push)
867 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
868 else
869 hdr = skb_vnet_hdr(skb);
870
871 if (skb->ip_summed == CHECKSUM_PARTIAL) {
872 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
873 hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev,
874 skb_checksum_start_offset(skb));
875 hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev,
876 skb->csum_offset);
877 } else {
878 hdr->hdr.flags = 0;
879 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
880 }
881
882 if (skb_is_gso(skb)) {
883 hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb));
884 hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev,
885 skb_shinfo(skb)->gso_size);
886 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
887 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
888 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
889 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
890 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
891 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
892 else
893 BUG();
894 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
895 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
896 } else {
897 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
898 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
899 }
900
901 if (vi->mergeable_rx_bufs)
902 hdr->num_buffers = 0;
903
904 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
905 if (can_push) {
906 __skb_push(skb, hdr_len);
907 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
908 /* Pull header back to avoid skew in tx bytes calculations. */
909 __skb_pull(skb, hdr_len);
910 } else {
911 sg_set_buf(sq->sg, hdr, hdr_len);
912 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
913 }
914 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
915}
916
917static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
918{
919 struct virtnet_info *vi = netdev_priv(dev);
920 int qnum = skb_get_queue_mapping(skb);
921 struct send_queue *sq = &vi->sq[qnum];
922 int err;
923 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
924 bool kick = !skb->xmit_more;
925
926 /* Free up any pending old buffers before queueing new ones. */
927 free_old_xmit_skbs(sq);
928
929 /* timestamp packet in software */
930 skb_tx_timestamp(skb);
931
932 /* Try to transmit */
933 err = xmit_skb(sq, skb);
934
935 /* This should not happen! */
936 if (unlikely(err)) {
937 dev->stats.tx_fifo_errors++;
938 if (net_ratelimit())
939 dev_warn(&dev->dev,
940 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
941 dev->stats.tx_dropped++;
942 dev_kfree_skb_any(skb);
943 return NETDEV_TX_OK;
944 }
945
946 /* Don't wait up for transmitted skbs to be freed. */
947 skb_orphan(skb);
948 nf_reset(skb);
949
950 /* If running out of space, stop queue to avoid getting packets that we
951 * are then unable to transmit.
952 * An alternative would be to force queuing layer to requeue the skb by
953 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
954 * returned in a normal path of operation: it means that driver is not
955 * maintaining the TX queue stop/start state properly, and causes
956 * the stack to do a non-trivial amount of useless work.
957 * Since most packets only take 1 or 2 ring slots, stopping the queue
958 * early means 16 slots are typically wasted.
959 */
960 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
961 netif_stop_subqueue(dev, qnum);
962 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
963 /* More just got used, free them then recheck. */
964 free_old_xmit_skbs(sq);
965 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
966 netif_start_subqueue(dev, qnum);
967 virtqueue_disable_cb(sq->vq);
968 }
969 }
970 }
971
972 if (kick || netif_xmit_stopped(txq))
973 virtqueue_kick(sq->vq);
974
975 return NETDEV_TX_OK;
976}
977
978/*
979 * Send command via the control virtqueue and check status. Commands
980 * supported by the hypervisor, as indicated by feature bits, should
981 * never fail unless improperly formatted.
982 */
983static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
984 struct scatterlist *out)
985{
986 struct scatterlist *sgs[4], hdr, stat;
987 unsigned out_num = 0, tmp;
988
989 /* Caller should know better */
990 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
991
992 vi->ctrl_status = ~0;
993 vi->ctrl_hdr.class = class;
994 vi->ctrl_hdr.cmd = cmd;
995 /* Add header */
996 sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr));
997 sgs[out_num++] = &hdr;
998
999 if (out)
1000 sgs[out_num++] = out;
1001
1002 /* Add return status. */
1003 sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status));
1004 sgs[out_num] = &stat;
1005
1006 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1007 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1008
1009 if (unlikely(!virtqueue_kick(vi->cvq)))
1010 return vi->ctrl_status == VIRTIO_NET_OK;
1011
1012 /* Spin for a response, the kick causes an ioport write, trapping
1013 * into the hypervisor, so the request should be handled immediately.
1014 */
1015 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1016 !virtqueue_is_broken(vi->cvq))
1017 cpu_relax();
1018
1019 return vi->ctrl_status == VIRTIO_NET_OK;
1020}
1021
1022static int virtnet_set_mac_address(struct net_device *dev, void *p)
1023{
1024 struct virtnet_info *vi = netdev_priv(dev);
1025 struct virtio_device *vdev = vi->vdev;
1026 int ret;
1027 struct sockaddr *addr = p;
1028 struct scatterlist sg;
1029
1030 ret = eth_prepare_mac_addr_change(dev, p);
1031 if (ret)
1032 return ret;
1033
1034 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1035 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1036 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1037 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1038 dev_warn(&vdev->dev,
1039 "Failed to set mac address by vq command.\n");
1040 return -EINVAL;
1041 }
1042 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1043 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1044 unsigned int i;
1045
1046 /* Naturally, this has an atomicity problem. */
1047 for (i = 0; i < dev->addr_len; i++)
1048 virtio_cwrite8(vdev,
1049 offsetof(struct virtio_net_config, mac) +
1050 i, addr->sa_data[i]);
1051 }
1052
1053 eth_commit_mac_addr_change(dev, p);
1054
1055 return 0;
1056}
1057
1058static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
1059 struct rtnl_link_stats64 *tot)
1060{
1061 struct virtnet_info *vi = netdev_priv(dev);
1062 int cpu;
1063 unsigned int start;
1064
1065 for_each_possible_cpu(cpu) {
1066 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
1067 u64 tpackets, tbytes, rpackets, rbytes;
1068
1069 do {
1070 start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
1071 tpackets = stats->tx_packets;
1072 tbytes = stats->tx_bytes;
1073 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
1074
1075 do {
1076 start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
1077 rpackets = stats->rx_packets;
1078 rbytes = stats->rx_bytes;
1079 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
1080
1081 tot->rx_packets += rpackets;
1082 tot->tx_packets += tpackets;
1083 tot->rx_bytes += rbytes;
1084 tot->tx_bytes += tbytes;
1085 }
1086
1087 tot->tx_dropped = dev->stats.tx_dropped;
1088 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1089 tot->rx_dropped = dev->stats.rx_dropped;
1090 tot->rx_length_errors = dev->stats.rx_length_errors;
1091 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1092
1093 return tot;
1094}
1095
1096#ifdef CONFIG_NET_POLL_CONTROLLER
1097static void virtnet_netpoll(struct net_device *dev)
1098{
1099 struct virtnet_info *vi = netdev_priv(dev);
1100 int i;
1101
1102 for (i = 0; i < vi->curr_queue_pairs; i++)
1103 napi_schedule(&vi->rq[i].napi);
1104}
1105#endif
1106
1107static void virtnet_ack_link_announce(struct virtnet_info *vi)
1108{
1109 rtnl_lock();
1110 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1111 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1112 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1113 rtnl_unlock();
1114}
1115
1116static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1117{
1118 struct scatterlist sg;
1119 struct virtio_net_ctrl_mq s;
1120 struct net_device *dev = vi->dev;
1121
1122 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1123 return 0;
1124
1125 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1126 sg_init_one(&sg, &s, sizeof(s));
1127
1128 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1129 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1130 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1131 queue_pairs);
1132 return -EINVAL;
1133 } else {
1134 vi->curr_queue_pairs = queue_pairs;
1135 /* virtnet_open() will refill when device is going to up. */
1136 if (dev->flags & IFF_UP)
1137 schedule_delayed_work(&vi->refill, 0);
1138 }
1139
1140 return 0;
1141}
1142
1143static int virtnet_close(struct net_device *dev)
1144{
1145 struct virtnet_info *vi = netdev_priv(dev);
1146 int i;
1147
1148 /* Make sure refill_work doesn't re-enable napi! */
1149 cancel_delayed_work_sync(&vi->refill);
1150
1151 for (i = 0; i < vi->max_queue_pairs; i++)
1152 napi_disable(&vi->rq[i].napi);
1153
1154 return 0;
1155}
1156
1157static void virtnet_set_rx_mode(struct net_device *dev)
1158{
1159 struct virtnet_info *vi = netdev_priv(dev);
1160 struct scatterlist sg[2];
1161 struct virtio_net_ctrl_mac *mac_data;
1162 struct netdev_hw_addr *ha;
1163 int uc_count;
1164 int mc_count;
1165 void *buf;
1166 int i;
1167
1168 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1169 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1170 return;
1171
1172 vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0);
1173 vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1174
1175 sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc));
1176
1177 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1178 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1179 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1180 vi->ctrl_promisc ? "en" : "dis");
1181
1182 sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti));
1183
1184 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1185 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1186 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1187 vi->ctrl_allmulti ? "en" : "dis");
1188
1189 uc_count = netdev_uc_count(dev);
1190 mc_count = netdev_mc_count(dev);
1191 /* MAC filter - use one buffer for both lists */
1192 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1193 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1194 mac_data = buf;
1195 if (!buf)
1196 return;
1197
1198 sg_init_table(sg, 2);
1199
1200 /* Store the unicast list and count in the front of the buffer */
1201 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1202 i = 0;
1203 netdev_for_each_uc_addr(ha, dev)
1204 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1205
1206 sg_set_buf(&sg[0], mac_data,
1207 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1208
1209 /* multicast list and count fill the end */
1210 mac_data = (void *)&mac_data->macs[uc_count][0];
1211
1212 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1213 i = 0;
1214 netdev_for_each_mc_addr(ha, dev)
1215 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1216
1217 sg_set_buf(&sg[1], mac_data,
1218 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1219
1220 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1221 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1222 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1223
1224 kfree(buf);
1225}
1226
1227static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1228 __be16 proto, u16 vid)
1229{
1230 struct virtnet_info *vi = netdev_priv(dev);
1231 struct scatterlist sg;
1232
1233 sg_init_one(&sg, &vid, sizeof(vid));
1234
1235 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1236 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1237 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1238 return 0;
1239}
1240
1241static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1242 __be16 proto, u16 vid)
1243{
1244 struct virtnet_info *vi = netdev_priv(dev);
1245 struct scatterlist sg;
1246
1247 sg_init_one(&sg, &vid, sizeof(vid));
1248
1249 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1250 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1251 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1252 return 0;
1253}
1254
1255static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1256{
1257 int i;
1258
1259 if (vi->affinity_hint_set) {
1260 for (i = 0; i < vi->max_queue_pairs; i++) {
1261 virtqueue_set_affinity(vi->rq[i].vq, -1);
1262 virtqueue_set_affinity(vi->sq[i].vq, -1);
1263 }
1264
1265 vi->affinity_hint_set = false;
1266 }
1267}
1268
1269static void virtnet_set_affinity(struct virtnet_info *vi)
1270{
1271 int i;
1272 int cpu;
1273
1274 /* In multiqueue mode, when the number of cpu is equal to the number of
1275 * queue pairs, we let the queue pairs to be private to one cpu by
1276 * setting the affinity hint to eliminate the contention.
1277 */
1278 if (vi->curr_queue_pairs == 1 ||
1279 vi->max_queue_pairs != num_online_cpus()) {
1280 virtnet_clean_affinity(vi, -1);
1281 return;
1282 }
1283
1284 i = 0;
1285 for_each_online_cpu(cpu) {
1286 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1287 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1288 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1289 i++;
1290 }
1291
1292 vi->affinity_hint_set = true;
1293}
1294
1295static int virtnet_cpu_callback(struct notifier_block *nfb,
1296 unsigned long action, void *hcpu)
1297{
1298 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
1299
1300 switch(action & ~CPU_TASKS_FROZEN) {
1301 case CPU_ONLINE:
1302 case CPU_DOWN_FAILED:
1303 case CPU_DEAD:
1304 virtnet_set_affinity(vi);
1305 break;
1306 case CPU_DOWN_PREPARE:
1307 virtnet_clean_affinity(vi, (long)hcpu);
1308 break;
1309 default:
1310 break;
1311 }
1312
1313 return NOTIFY_OK;
1314}
1315
1316static void virtnet_get_ringparam(struct net_device *dev,
1317 struct ethtool_ringparam *ring)
1318{
1319 struct virtnet_info *vi = netdev_priv(dev);
1320
1321 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1322 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1323 ring->rx_pending = ring->rx_max_pending;
1324 ring->tx_pending = ring->tx_max_pending;
1325}
1326
1327
1328static void virtnet_get_drvinfo(struct net_device *dev,
1329 struct ethtool_drvinfo *info)
1330{
1331 struct virtnet_info *vi = netdev_priv(dev);
1332 struct virtio_device *vdev = vi->vdev;
1333
1334 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1335 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1336 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1337
1338}
1339
1340/* TODO: Eliminate OOO packets during switching */
1341static int virtnet_set_channels(struct net_device *dev,
1342 struct ethtool_channels *channels)
1343{
1344 struct virtnet_info *vi = netdev_priv(dev);
1345 u16 queue_pairs = channels->combined_count;
1346 int err;
1347
1348 /* We don't support separate rx/tx channels.
1349 * We don't allow setting 'other' channels.
1350 */
1351 if (channels->rx_count || channels->tx_count || channels->other_count)
1352 return -EINVAL;
1353
1354 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1355 return -EINVAL;
1356
1357 get_online_cpus();
1358 err = virtnet_set_queues(vi, queue_pairs);
1359 if (!err) {
1360 netif_set_real_num_tx_queues(dev, queue_pairs);
1361 netif_set_real_num_rx_queues(dev, queue_pairs);
1362
1363 virtnet_set_affinity(vi);
1364 }
1365 put_online_cpus();
1366
1367 return err;
1368}
1369
1370static void virtnet_get_channels(struct net_device *dev,
1371 struct ethtool_channels *channels)
1372{
1373 struct virtnet_info *vi = netdev_priv(dev);
1374
1375 channels->combined_count = vi->curr_queue_pairs;
1376 channels->max_combined = vi->max_queue_pairs;
1377 channels->max_other = 0;
1378 channels->rx_count = 0;
1379 channels->tx_count = 0;
1380 channels->other_count = 0;
1381}
1382
1383/* Check if the user is trying to change anything besides speed/duplex */
1384static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd)
1385{
1386 struct ethtool_cmd diff1 = *cmd;
1387 struct ethtool_cmd diff2 = {};
1388
1389 /* cmd is always set so we need to clear it, validate the port type
1390 * and also without autonegotiation we can ignore advertising
1391 */
1392 ethtool_cmd_speed_set(&diff1, 0);
1393 diff2.port = PORT_OTHER;
1394 diff1.advertising = 0;
1395 diff1.duplex = 0;
1396 diff1.cmd = 0;
1397
1398 return !memcmp(&diff1, &diff2, sizeof(diff1));
1399}
1400
1401static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1402{
1403 struct virtnet_info *vi = netdev_priv(dev);
1404 u32 speed;
1405
1406 speed = ethtool_cmd_speed(cmd);
1407 /* don't allow custom speed and duplex */
1408 if (!ethtool_validate_speed(speed) ||
1409 !ethtool_validate_duplex(cmd->duplex) ||
1410 !virtnet_validate_ethtool_cmd(cmd))
1411 return -EINVAL;
1412 vi->speed = speed;
1413 vi->duplex = cmd->duplex;
1414
1415 return 0;
1416}
1417
1418static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1419{
1420 struct virtnet_info *vi = netdev_priv(dev);
1421
1422 ethtool_cmd_speed_set(cmd, vi->speed);
1423 cmd->duplex = vi->duplex;
1424 cmd->port = PORT_OTHER;
1425
1426 return 0;
1427}
1428
1429static void virtnet_init_settings(struct net_device *dev)
1430{
1431 struct virtnet_info *vi = netdev_priv(dev);
1432
1433 vi->speed = SPEED_UNKNOWN;
1434 vi->duplex = DUPLEX_UNKNOWN;
1435}
1436
1437static const struct ethtool_ops virtnet_ethtool_ops = {
1438 .get_drvinfo = virtnet_get_drvinfo,
1439 .get_link = ethtool_op_get_link,
1440 .get_ringparam = virtnet_get_ringparam,
1441 .set_channels = virtnet_set_channels,
1442 .get_channels = virtnet_get_channels,
1443 .get_ts_info = ethtool_op_get_ts_info,
1444 .get_settings = virtnet_get_settings,
1445 .set_settings = virtnet_set_settings,
1446};
1447
1448#define MIN_MTU 68
1449#define MAX_MTU 65535
1450
1451static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1452{
1453 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1454 return -EINVAL;
1455 dev->mtu = new_mtu;
1456 return 0;
1457}
1458
1459static const struct net_device_ops virtnet_netdev = {
1460 .ndo_open = virtnet_open,
1461 .ndo_stop = virtnet_close,
1462 .ndo_start_xmit = start_xmit,
1463 .ndo_validate_addr = eth_validate_addr,
1464 .ndo_set_mac_address = virtnet_set_mac_address,
1465 .ndo_set_rx_mode = virtnet_set_rx_mode,
1466 .ndo_change_mtu = virtnet_change_mtu,
1467 .ndo_get_stats64 = virtnet_stats,
1468 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1469 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1470#ifdef CONFIG_NET_POLL_CONTROLLER
1471 .ndo_poll_controller = virtnet_netpoll,
1472#endif
1473#ifdef CONFIG_NET_RX_BUSY_POLL
1474 .ndo_busy_poll = virtnet_busy_poll,
1475#endif
1476};
1477
1478static void virtnet_config_changed_work(struct work_struct *work)
1479{
1480 struct virtnet_info *vi =
1481 container_of(work, struct virtnet_info, config_work);
1482 u16 v;
1483
1484 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
1485 struct virtio_net_config, status, &v) < 0)
1486 return;
1487
1488 if (v & VIRTIO_NET_S_ANNOUNCE) {
1489 netdev_notify_peers(vi->dev);
1490 virtnet_ack_link_announce(vi);
1491 }
1492
1493 /* Ignore unknown (future) status bits */
1494 v &= VIRTIO_NET_S_LINK_UP;
1495
1496 if (vi->status == v)
1497 return;
1498
1499 vi->status = v;
1500
1501 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1502 netif_carrier_on(vi->dev);
1503 netif_tx_wake_all_queues(vi->dev);
1504 } else {
1505 netif_carrier_off(vi->dev);
1506 netif_tx_stop_all_queues(vi->dev);
1507 }
1508}
1509
1510static void virtnet_config_changed(struct virtio_device *vdev)
1511{
1512 struct virtnet_info *vi = vdev->priv;
1513
1514 schedule_work(&vi->config_work);
1515}
1516
1517static void virtnet_free_queues(struct virtnet_info *vi)
1518{
1519 int i;
1520
1521 for (i = 0; i < vi->max_queue_pairs; i++) {
1522 napi_hash_del(&vi->rq[i].napi);
1523 netif_napi_del(&vi->rq[i].napi);
1524 }
1525
1526 kfree(vi->rq);
1527 kfree(vi->sq);
1528}
1529
1530static void free_receive_bufs(struct virtnet_info *vi)
1531{
1532 int i;
1533
1534 for (i = 0; i < vi->max_queue_pairs; i++) {
1535 while (vi->rq[i].pages)
1536 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1537 }
1538}
1539
1540static void free_receive_page_frags(struct virtnet_info *vi)
1541{
1542 int i;
1543 for (i = 0; i < vi->max_queue_pairs; i++)
1544 if (vi->rq[i].alloc_frag.page)
1545 put_page(vi->rq[i].alloc_frag.page);
1546}
1547
1548static void free_unused_bufs(struct virtnet_info *vi)
1549{
1550 void *buf;
1551 int i;
1552
1553 for (i = 0; i < vi->max_queue_pairs; i++) {
1554 struct virtqueue *vq = vi->sq[i].vq;
1555 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1556 dev_kfree_skb(buf);
1557 }
1558
1559 for (i = 0; i < vi->max_queue_pairs; i++) {
1560 struct virtqueue *vq = vi->rq[i].vq;
1561
1562 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1563 if (vi->mergeable_rx_bufs) {
1564 unsigned long ctx = (unsigned long)buf;
1565 void *base = mergeable_ctx_to_buf_address(ctx);
1566 put_page(virt_to_head_page(base));
1567 } else if (vi->big_packets) {
1568 give_pages(&vi->rq[i], buf);
1569 } else {
1570 dev_kfree_skb(buf);
1571 }
1572 }
1573 }
1574}
1575
1576static void virtnet_del_vqs(struct virtnet_info *vi)
1577{
1578 struct virtio_device *vdev = vi->vdev;
1579
1580 virtnet_clean_affinity(vi, -1);
1581
1582 vdev->config->del_vqs(vdev);
1583
1584 virtnet_free_queues(vi);
1585}
1586
1587static int virtnet_find_vqs(struct virtnet_info *vi)
1588{
1589 vq_callback_t **callbacks;
1590 struct virtqueue **vqs;
1591 int ret = -ENOMEM;
1592 int i, total_vqs;
1593 const char **names;
1594
1595 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1596 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1597 * possible control vq.
1598 */
1599 total_vqs = vi->max_queue_pairs * 2 +
1600 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1601
1602 /* Allocate space for find_vqs parameters */
1603 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1604 if (!vqs)
1605 goto err_vq;
1606 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1607 if (!callbacks)
1608 goto err_callback;
1609 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1610 if (!names)
1611 goto err_names;
1612
1613 /* Parameters for control virtqueue, if any */
1614 if (vi->has_cvq) {
1615 callbacks[total_vqs - 1] = NULL;
1616 names[total_vqs - 1] = "control";
1617 }
1618
1619 /* Allocate/initialize parameters for send/receive virtqueues */
1620 for (i = 0; i < vi->max_queue_pairs; i++) {
1621 callbacks[rxq2vq(i)] = skb_recv_done;
1622 callbacks[txq2vq(i)] = skb_xmit_done;
1623 sprintf(vi->rq[i].name, "input.%d", i);
1624 sprintf(vi->sq[i].name, "output.%d", i);
1625 names[rxq2vq(i)] = vi->rq[i].name;
1626 names[txq2vq(i)] = vi->sq[i].name;
1627 }
1628
1629 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1630 names);
1631 if (ret)
1632 goto err_find;
1633
1634 if (vi->has_cvq) {
1635 vi->cvq = vqs[total_vqs - 1];
1636 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1637 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1638 }
1639
1640 for (i = 0; i < vi->max_queue_pairs; i++) {
1641 vi->rq[i].vq = vqs[rxq2vq(i)];
1642 vi->sq[i].vq = vqs[txq2vq(i)];
1643 }
1644
1645 kfree(names);
1646 kfree(callbacks);
1647 kfree(vqs);
1648
1649 return 0;
1650
1651err_find:
1652 kfree(names);
1653err_names:
1654 kfree(callbacks);
1655err_callback:
1656 kfree(vqs);
1657err_vq:
1658 return ret;
1659}
1660
1661static int virtnet_alloc_queues(struct virtnet_info *vi)
1662{
1663 int i;
1664
1665 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1666 if (!vi->sq)
1667 goto err_sq;
1668 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1669 if (!vi->rq)
1670 goto err_rq;
1671
1672 INIT_DELAYED_WORK(&vi->refill, refill_work);
1673 for (i = 0; i < vi->max_queue_pairs; i++) {
1674 vi->rq[i].pages = NULL;
1675 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1676 napi_weight);
1677
1678 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1679 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
1680 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1681 }
1682
1683 return 0;
1684
1685err_rq:
1686 kfree(vi->sq);
1687err_sq:
1688 return -ENOMEM;
1689}
1690
1691static int init_vqs(struct virtnet_info *vi)
1692{
1693 int ret;
1694
1695 /* Allocate send & receive queues */
1696 ret = virtnet_alloc_queues(vi);
1697 if (ret)
1698 goto err;
1699
1700 ret = virtnet_find_vqs(vi);
1701 if (ret)
1702 goto err_free;
1703
1704 get_online_cpus();
1705 virtnet_set_affinity(vi);
1706 put_online_cpus();
1707
1708 return 0;
1709
1710err_free:
1711 virtnet_free_queues(vi);
1712err:
1713 return ret;
1714}
1715
1716#ifdef CONFIG_SYSFS
1717static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
1718 struct rx_queue_attribute *attribute, char *buf)
1719{
1720 struct virtnet_info *vi = netdev_priv(queue->dev);
1721 unsigned int queue_index = get_netdev_rx_queue_index(queue);
1722 struct ewma_pkt_len *avg;
1723
1724 BUG_ON(queue_index >= vi->max_queue_pairs);
1725 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
1726 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
1727}
1728
1729static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
1730 __ATTR_RO(mergeable_rx_buffer_size);
1731
1732static struct attribute *virtio_net_mrg_rx_attrs[] = {
1733 &mergeable_rx_buffer_size_attribute.attr,
1734 NULL
1735};
1736
1737static const struct attribute_group virtio_net_mrg_rx_group = {
1738 .name = "virtio_net",
1739 .attrs = virtio_net_mrg_rx_attrs
1740};
1741#endif
1742
1743static bool virtnet_fail_on_feature(struct virtio_device *vdev,
1744 unsigned int fbit,
1745 const char *fname, const char *dname)
1746{
1747 if (!virtio_has_feature(vdev, fbit))
1748 return false;
1749
1750 dev_err(&vdev->dev, "device advertises feature %s but not %s",
1751 fname, dname);
1752
1753 return true;
1754}
1755
1756#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
1757 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
1758
1759static bool virtnet_validate_features(struct virtio_device *vdev)
1760{
1761 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
1762 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
1763 "VIRTIO_NET_F_CTRL_VQ") ||
1764 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
1765 "VIRTIO_NET_F_CTRL_VQ") ||
1766 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
1767 "VIRTIO_NET_F_CTRL_VQ") ||
1768 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
1769 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
1770 "VIRTIO_NET_F_CTRL_VQ"))) {
1771 return false;
1772 }
1773
1774 return true;
1775}
1776
1777static int virtnet_probe(struct virtio_device *vdev)
1778{
1779 int i, err;
1780 struct net_device *dev;
1781 struct virtnet_info *vi;
1782 u16 max_queue_pairs;
1783
1784 if (!vdev->config->get) {
1785 dev_err(&vdev->dev, "%s failure: config access disabled\n",
1786 __func__);
1787 return -EINVAL;
1788 }
1789
1790 if (!virtnet_validate_features(vdev))
1791 return -EINVAL;
1792
1793 /* Find if host supports multiqueue virtio_net device */
1794 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
1795 struct virtio_net_config,
1796 max_virtqueue_pairs, &max_queue_pairs);
1797
1798 /* We need at least 2 queue's */
1799 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1800 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1801 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1802 max_queue_pairs = 1;
1803
1804 /* Allocate ourselves a network device with room for our info */
1805 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1806 if (!dev)
1807 return -ENOMEM;
1808
1809 /* Set up network device as normal. */
1810 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1811 dev->netdev_ops = &virtnet_netdev;
1812 dev->features = NETIF_F_HIGHDMA;
1813
1814 dev->ethtool_ops = &virtnet_ethtool_ops;
1815 SET_NETDEV_DEV(dev, &vdev->dev);
1816
1817 /* Do we support "hardware" checksums? */
1818 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1819 /* This opens up the world of extra features. */
1820 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
1821 if (csum)
1822 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
1823
1824 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1825 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1826 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1827 }
1828 /* Individual feature bits: what can host handle? */
1829 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1830 dev->hw_features |= NETIF_F_TSO;
1831 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1832 dev->hw_features |= NETIF_F_TSO6;
1833 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1834 dev->hw_features |= NETIF_F_TSO_ECN;
1835 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1836 dev->hw_features |= NETIF_F_UFO;
1837
1838 dev->features |= NETIF_F_GSO_ROBUST;
1839
1840 if (gso)
1841 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1842 /* (!csum && gso) case will be fixed by register_netdev() */
1843 }
1844 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
1845 dev->features |= NETIF_F_RXCSUM;
1846
1847 dev->vlan_features = dev->features;
1848
1849 /* Configuration may specify what MAC to use. Otherwise random. */
1850 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
1851 virtio_cread_bytes(vdev,
1852 offsetof(struct virtio_net_config, mac),
1853 dev->dev_addr, dev->addr_len);
1854 else
1855 eth_hw_addr_random(dev);
1856
1857 /* Set up our device-specific information */
1858 vi = netdev_priv(dev);
1859 vi->dev = dev;
1860 vi->vdev = vdev;
1861 vdev->priv = vi;
1862 vi->stats = alloc_percpu(struct virtnet_stats);
1863 err = -ENOMEM;
1864 if (vi->stats == NULL)
1865 goto free;
1866
1867 for_each_possible_cpu(i) {
1868 struct virtnet_stats *virtnet_stats;
1869 virtnet_stats = per_cpu_ptr(vi->stats, i);
1870 u64_stats_init(&virtnet_stats->tx_syncp);
1871 u64_stats_init(&virtnet_stats->rx_syncp);
1872 }
1873
1874 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1875
1876 /* If we can receive ANY GSO packets, we must allocate large ones. */
1877 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1878 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1879 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
1880 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
1881 vi->big_packets = true;
1882
1883 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1884 vi->mergeable_rx_bufs = true;
1885
1886 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
1887 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
1888 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1889 else
1890 vi->hdr_len = sizeof(struct virtio_net_hdr);
1891
1892 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
1893 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
1894 vi->any_header_sg = true;
1895
1896 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1897 vi->has_cvq = true;
1898
1899 if (vi->any_header_sg)
1900 dev->needed_headroom = vi->hdr_len;
1901
1902 /* Use single tx/rx queue pair as default */
1903 vi->curr_queue_pairs = 1;
1904 vi->max_queue_pairs = max_queue_pairs;
1905
1906 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1907 err = init_vqs(vi);
1908 if (err)
1909 goto free_stats;
1910
1911#ifdef CONFIG_SYSFS
1912 if (vi->mergeable_rx_bufs)
1913 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
1914#endif
1915 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
1916 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
1917
1918 virtnet_init_settings(dev);
1919
1920 err = register_netdev(dev);
1921 if (err) {
1922 pr_debug("virtio_net: registering device failed\n");
1923 goto free_vqs;
1924 }
1925
1926 virtio_device_ready(vdev);
1927
1928 /* Last of all, set up some receive buffers. */
1929 for (i = 0; i < vi->curr_queue_pairs; i++) {
1930 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL);
1931
1932 /* If we didn't even get one input buffer, we're useless. */
1933 if (vi->rq[i].vq->num_free ==
1934 virtqueue_get_vring_size(vi->rq[i].vq)) {
1935 free_unused_bufs(vi);
1936 err = -ENOMEM;
1937 goto free_recv_bufs;
1938 }
1939 }
1940
1941 vi->nb.notifier_call = &virtnet_cpu_callback;
1942 err = register_hotcpu_notifier(&vi->nb);
1943 if (err) {
1944 pr_debug("virtio_net: registering cpu notifier failed\n");
1945 goto free_recv_bufs;
1946 }
1947
1948 /* Assume link up if device can't report link status,
1949 otherwise get link status from config. */
1950 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1951 netif_carrier_off(dev);
1952 schedule_work(&vi->config_work);
1953 } else {
1954 vi->status = VIRTIO_NET_S_LINK_UP;
1955 netif_carrier_on(dev);
1956 }
1957
1958 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1959 dev->name, max_queue_pairs);
1960
1961 return 0;
1962
1963free_recv_bufs:
1964 vi->vdev->config->reset(vdev);
1965
1966 free_receive_bufs(vi);
1967 unregister_netdev(dev);
1968free_vqs:
1969 cancel_delayed_work_sync(&vi->refill);
1970 free_receive_page_frags(vi);
1971 virtnet_del_vqs(vi);
1972free_stats:
1973 free_percpu(vi->stats);
1974free:
1975 free_netdev(dev);
1976 return err;
1977}
1978
1979static void remove_vq_common(struct virtnet_info *vi)
1980{
1981 vi->vdev->config->reset(vi->vdev);
1982
1983 /* Free unused buffers in both send and recv, if any. */
1984 free_unused_bufs(vi);
1985
1986 free_receive_bufs(vi);
1987
1988 free_receive_page_frags(vi);
1989
1990 virtnet_del_vqs(vi);
1991}
1992
1993static void virtnet_remove(struct virtio_device *vdev)
1994{
1995 struct virtnet_info *vi = vdev->priv;
1996
1997 unregister_hotcpu_notifier(&vi->nb);
1998
1999 /* Make sure no work handler is accessing the device. */
2000 flush_work(&vi->config_work);
2001
2002 unregister_netdev(vi->dev);
2003
2004 remove_vq_common(vi);
2005
2006 free_percpu(vi->stats);
2007 free_netdev(vi->dev);
2008}
2009
2010#ifdef CONFIG_PM_SLEEP
2011static int virtnet_freeze(struct virtio_device *vdev)
2012{
2013 struct virtnet_info *vi = vdev->priv;
2014 int i;
2015
2016 unregister_hotcpu_notifier(&vi->nb);
2017
2018 /* Make sure no work handler is accessing the device */
2019 flush_work(&vi->config_work);
2020
2021 netif_device_detach(vi->dev);
2022 cancel_delayed_work_sync(&vi->refill);
2023
2024 if (netif_running(vi->dev)) {
2025 for (i = 0; i < vi->max_queue_pairs; i++)
2026 napi_disable(&vi->rq[i].napi);
2027 }
2028
2029 remove_vq_common(vi);
2030
2031 return 0;
2032}
2033
2034static int virtnet_restore(struct virtio_device *vdev)
2035{
2036 struct virtnet_info *vi = vdev->priv;
2037 int err, i;
2038
2039 err = init_vqs(vi);
2040 if (err)
2041 return err;
2042
2043 virtio_device_ready(vdev);
2044
2045 if (netif_running(vi->dev)) {
2046 for (i = 0; i < vi->curr_queue_pairs; i++)
2047 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2048 schedule_delayed_work(&vi->refill, 0);
2049
2050 for (i = 0; i < vi->max_queue_pairs; i++)
2051 virtnet_napi_enable(&vi->rq[i]);
2052 }
2053
2054 netif_device_attach(vi->dev);
2055
2056 rtnl_lock();
2057 virtnet_set_queues(vi, vi->curr_queue_pairs);
2058 rtnl_unlock();
2059
2060 err = register_hotcpu_notifier(&vi->nb);
2061 if (err)
2062 return err;
2063
2064 return 0;
2065}
2066#endif
2067
2068static struct virtio_device_id id_table[] = {
2069 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
2070 { 0 },
2071};
2072
2073static unsigned int features[] = {
2074 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
2075 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
2076 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
2077 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
2078 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
2079 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
2080 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
2081 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
2082 VIRTIO_NET_F_CTRL_MAC_ADDR,
2083 VIRTIO_F_ANY_LAYOUT,
2084};
2085
2086static struct virtio_driver virtio_net_driver = {
2087 .feature_table = features,
2088 .feature_table_size = ARRAY_SIZE(features),
2089 .driver.name = KBUILD_MODNAME,
2090 .driver.owner = THIS_MODULE,
2091 .id_table = id_table,
2092 .probe = virtnet_probe,
2093 .remove = virtnet_remove,
2094 .config_changed = virtnet_config_changed,
2095#ifdef CONFIG_PM_SLEEP
2096 .freeze = virtnet_freeze,
2097 .restore = virtnet_restore,
2098#endif
2099};
2100
2101module_virtio_driver(virtio_net_driver);
2102
2103MODULE_DEVICE_TABLE(virtio, id_table);
2104MODULE_DESCRIPTION("Virtio network driver");
2105MODULE_LICENSE("GPL");