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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / net / virtio_net.c
blob3e2c041d76ac1ac61fe5f6033c378feb4e3d6fd0
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/bpf.h>
26 #include <linux/bpf_trace.h>
27 #include <linux/scatterlist.h>
28 #include <linux/if_vlan.h>
29 #include <linux/slab.h>
30 #include <linux/cpu.h>
31 #include <linux/average.h>
32 #include <linux/filter.h>
33 #include <linux/kernel.h>
34 #include <linux/pci.h>
35 #include <net/route.h>
36 #include <net/xdp.h>
37 #include <net/net_failover.h>
38
39 static int napi_weight = NAPI_POLL_WEIGHT;
40 module_param(napi_weight, int, 0444);
41
42 static bool csum = true, gso = true, napi_tx;
43 module_param(csum, bool, 0444);
44 module_param(gso, bool, 0444);
45 module_param(napi_tx, bool, 0644);
46
47 /* FIXME: MTU in config. */
48 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
49 #define GOOD_COPY_LEN 128
50
51 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
52
53 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */
54 #define VIRTIO_XDP_HEADROOM 256
55
56 /* Separating two types of XDP xmit */
57 #define VIRTIO_XDP_TX BIT(0)
58 #define VIRTIO_XDP_REDIR BIT(1)
59
60 /* RX packet size EWMA. The average packet size is used to determine the packet
61 * buffer size when refilling RX rings. As the entire RX ring may be refilled
62 * at once, the weight is chosen so that the EWMA will be insensitive to short-
63 * term, transient changes in packet size.
64 */
65 DECLARE_EWMA(pkt_len, 0, 64)
66
67 #define VIRTNET_DRIVER_VERSION "1.0.0"
68
69 static const unsigned long guest_offloads[] = {
70 VIRTIO_NET_F_GUEST_TSO4,
71 VIRTIO_NET_F_GUEST_TSO6,
72 VIRTIO_NET_F_GUEST_ECN,
73 VIRTIO_NET_F_GUEST_UFO
74 };
75
76 struct virtnet_stat_desc {
77 char desc[ETH_GSTRING_LEN];
78 size_t offset;
79 };
80
81 struct virtnet_sq_stats {
82 struct u64_stats_sync syncp;
83 u64 packets;
84 u64 bytes;
85 u64 xdp_tx;
86 u64 xdp_tx_drops;
87 u64 kicks;
88 };
89
90 struct virtnet_rq_stats {
91 struct u64_stats_sync syncp;
92 u64 packets;
93 u64 bytes;
94 u64 drops;
95 u64 xdp_packets;
96 u64 xdp_tx;
97 u64 xdp_redirects;
98 u64 xdp_drops;
99 u64 kicks;
100 };
101
102 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
103 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
104
105 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
106 { "packets", VIRTNET_SQ_STAT(packets) },
107 { "bytes", VIRTNET_SQ_STAT(bytes) },
108 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
109 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
110 { "kicks", VIRTNET_SQ_STAT(kicks) },
111 };
112
113 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
114 { "packets", VIRTNET_RQ_STAT(packets) },
115 { "bytes", VIRTNET_RQ_STAT(bytes) },
116 { "drops", VIRTNET_RQ_STAT(drops) },
117 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
118 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
119 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
120 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
121 { "kicks", VIRTNET_RQ_STAT(kicks) },
122 };
123
124 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
125 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
126
127 /* Internal representation of a send virtqueue */
128 struct send_queue {
129 /* Virtqueue associated with this send _queue */
130 struct virtqueue *vq;
131
132 /* TX: fragments + linear part + virtio header */
133 struct scatterlist sg[MAX_SKB_FRAGS + 2];
134
135 /* Name of the send queue: output.$index */
136 char name[40];
137
138 struct virtnet_sq_stats stats;
139
140 struct napi_struct napi;
141 };
142
143 /* Internal representation of a receive virtqueue */
144 struct receive_queue {
145 /* Virtqueue associated with this receive_queue */
146 struct virtqueue *vq;
147
148 struct napi_struct napi;
149
150 struct bpf_prog __rcu *xdp_prog;
151
152 struct virtnet_rq_stats stats;
153
154 /* Chain pages by the private ptr. */
155 struct page *pages;
156
157 /* Average packet length for mergeable receive buffers. */
158 struct ewma_pkt_len mrg_avg_pkt_len;
159
160 /* Page frag for packet buffer allocation. */
161 struct page_frag alloc_frag;
162
163 /* RX: fragments + linear part + virtio header */
164 struct scatterlist sg[MAX_SKB_FRAGS + 2];
165
166 /* Min single buffer size for mergeable buffers case. */
167 unsigned int min_buf_len;
168
169 /* Name of this receive queue: input.$index */
170 char name[40];
171
172 struct xdp_rxq_info xdp_rxq;
173 };
174
175 /* Control VQ buffers: protected by the rtnl lock */
176 struct control_buf {
177 struct virtio_net_ctrl_hdr hdr;
178 virtio_net_ctrl_ack status;
179 struct virtio_net_ctrl_mq mq;
180 u8 promisc;
181 u8 allmulti;
182 __virtio16 vid;
183 __virtio64 offloads;
184 };
185
186 struct virtnet_info {
187 struct virtio_device *vdev;
188 struct virtqueue *cvq;
189 struct net_device *dev;
190 struct send_queue *sq;
191 struct receive_queue *rq;
192 unsigned int status;
193
194 /* Max # of queue pairs supported by the device */
195 u16 max_queue_pairs;
196
197 /* # of queue pairs currently used by the driver */
198 u16 curr_queue_pairs;
199
200 /* # of XDP queue pairs currently used by the driver */
201 u16 xdp_queue_pairs;
202
203 /* I like... big packets and I cannot lie! */
204 bool big_packets;
205
206 /* Host will merge rx buffers for big packets (shake it! shake it!) */
207 bool mergeable_rx_bufs;
208
209 /* Has control virtqueue */
210 bool has_cvq;
211
212 /* Host can handle any s/g split between our header and packet data */
213 bool any_header_sg;
214
215 /* Packet virtio header size */
216 u8 hdr_len;
217
218 /* Work struct for refilling if we run low on memory. */
219 struct delayed_work refill;
220
221 /* Work struct for config space updates */
222 struct work_struct config_work;
223
224 /* Does the affinity hint is set for virtqueues? */
225 bool affinity_hint_set;
226
227 /* CPU hotplug instances for online & dead */
228 struct hlist_node node;
229 struct hlist_node node_dead;
230
231 struct control_buf *ctrl;
232
233 /* Ethtool settings */
234 u8 duplex;
235 u32 speed;
236
237 unsigned long guest_offloads;
238
239 /* failover when STANDBY feature enabled */
240 struct failover *failover;
241 };
242
243 struct padded_vnet_hdr {
244 struct virtio_net_hdr_mrg_rxbuf hdr;
245 /*
246 * hdr is in a separate sg buffer, and data sg buffer shares same page
247 * with this header sg. This padding makes next sg 16 byte aligned
248 * after the header.
249 */
250 char padding[4];
251 };
252
253 /* Converting between virtqueue no. and kernel tx/rx queue no.
254 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
255 */
256 static int vq2txq(struct virtqueue *vq)
257 {
258 return (vq->index - 1) / 2;
259 }
260
261 static int txq2vq(int txq)
262 {
263 return txq * 2 + 1;
264 }
265
266 static int vq2rxq(struct virtqueue *vq)
267 {
268 return vq->index / 2;
269 }
270
271 static int rxq2vq(int rxq)
272 {
273 return rxq * 2;
274 }
275
276 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
277 {
278 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
279 }
280
281 /*
282 * private is used to chain pages for big packets, put the whole
283 * most recent used list in the beginning for reuse
284 */
285 static void give_pages(struct receive_queue *rq, struct page *page)
286 {
287 struct page *end;
288
289 /* Find end of list, sew whole thing into vi->rq.pages. */
290 for (end = page; end->private; end = (struct page *)end->private);
291 end->private = (unsigned long)rq->pages;
292 rq->pages = page;
293 }
294
295 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
296 {
297 struct page *p = rq->pages;
298
299 if (p) {
300 rq->pages = (struct page *)p->private;
301 /* clear private here, it is used to chain pages */
302 p->private = 0;
303 } else
304 p = alloc_page(gfp_mask);
305 return p;
306 }
307
308 static void virtqueue_napi_schedule(struct napi_struct *napi,
309 struct virtqueue *vq)
310 {
311 if (napi_schedule_prep(napi)) {
312 virtqueue_disable_cb(vq);
313 __napi_schedule(napi);
314 }
315 }
316
317 static void virtqueue_napi_complete(struct napi_struct *napi,
318 struct virtqueue *vq, int processed)
319 {
320 int opaque;
321
322 opaque = virtqueue_enable_cb_prepare(vq);
323 if (napi_complete_done(napi, processed)) {
324 if (unlikely(virtqueue_poll(vq, opaque)))
325 virtqueue_napi_schedule(napi, vq);
326 } else {
327 virtqueue_disable_cb(vq);
328 }
329 }
330
331 static void skb_xmit_done(struct virtqueue *vq)
332 {
333 struct virtnet_info *vi = vq->vdev->priv;
334 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
335
336 /* Suppress further interrupts. */
337 virtqueue_disable_cb(vq);
338
339 if (napi->weight)
340 virtqueue_napi_schedule(napi, vq);
341 else
342 /* We were probably waiting for more output buffers. */
343 netif_wake_subqueue(vi->dev, vq2txq(vq));
344 }
345
346 #define MRG_CTX_HEADER_SHIFT 22
347 static void *mergeable_len_to_ctx(unsigned int truesize,
348 unsigned int headroom)
349 {
350 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
351 }
352
353 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
354 {
355 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
356 }
357
358 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
359 {
360 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
361 }
362
363 /* Called from bottom half context */
364 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
365 struct receive_queue *rq,
366 struct page *page, unsigned int offset,
367 unsigned int len, unsigned int truesize)
368 {
369 struct sk_buff *skb;
370 struct virtio_net_hdr_mrg_rxbuf *hdr;
371 unsigned int copy, hdr_len, hdr_padded_len;
372 char *p;
373
374 p = page_address(page) + offset;
375
376 /* copy small packet so we can reuse these pages for small data */
377 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
378 if (unlikely(!skb))
379 return NULL;
380
381 hdr = skb_vnet_hdr(skb);
382
383 hdr_len = vi->hdr_len;
384 if (vi->mergeable_rx_bufs)
385 hdr_padded_len = sizeof(*hdr);
386 else
387 hdr_padded_len = sizeof(struct padded_vnet_hdr);
388
389 memcpy(hdr, p, hdr_len);
390
391 len -= hdr_len;
392 offset += hdr_padded_len;
393 p += hdr_padded_len;
394
395 copy = len;
396 if (copy > skb_tailroom(skb))
397 copy = skb_tailroom(skb);
398 skb_put_data(skb, p, copy);
399
400 len -= copy;
401 offset += copy;
402
403 if (vi->mergeable_rx_bufs) {
404 if (len)
405 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
406 else
407 put_page(page);
408 return skb;
409 }
410
411 /*
412 * Verify that we can indeed put this data into a skb.
413 * This is here to handle cases when the device erroneously
414 * tries to receive more than is possible. This is usually
415 * the case of a broken device.
416 */
417 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
418 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
419 dev_kfree_skb(skb);
420 return NULL;
421 }
422 BUG_ON(offset >= PAGE_SIZE);
423 while (len) {
424 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
425 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
426 frag_size, truesize);
427 len -= frag_size;
428 page = (struct page *)page->private;
429 offset = 0;
430 }
431
432 if (page)
433 give_pages(rq, page);
434
435 return skb;
436 }
437
438 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
439 struct send_queue *sq,
440 struct xdp_frame *xdpf)
441 {
442 struct virtio_net_hdr_mrg_rxbuf *hdr;
443 int err;
444
445 /* virtqueue want to use data area in-front of packet */
446 if (unlikely(xdpf->metasize > 0))
447 return -EOPNOTSUPP;
448
449 if (unlikely(xdpf->headroom < vi->hdr_len))
450 return -EOVERFLOW;
451
452 /* Make room for virtqueue hdr (also change xdpf->headroom?) */
453 xdpf->data -= vi->hdr_len;
454 /* Zero header and leave csum up to XDP layers */
455 hdr = xdpf->data;
456 memset(hdr, 0, vi->hdr_len);
457 xdpf->len += vi->hdr_len;
458
459 sg_init_one(sq->sg, xdpf->data, xdpf->len);
460
461 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdpf, GFP_ATOMIC);
462 if (unlikely(err))
463 return -ENOSPC; /* Caller handle free/refcnt */
464
465 return 0;
466 }
467
468 static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi)
469 {
470 unsigned int qp;
471
472 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
473 return &vi->sq[qp];
474 }
475
476 static int virtnet_xdp_xmit(struct net_device *dev,
477 int n, struct xdp_frame **frames, u32 flags)
478 {
479 struct virtnet_info *vi = netdev_priv(dev);
480 struct receive_queue *rq = vi->rq;
481 struct xdp_frame *xdpf_sent;
482 struct bpf_prog *xdp_prog;
483 struct send_queue *sq;
484 unsigned int len;
485 int drops = 0;
486 int kicks = 0;
487 int ret, err;
488 int i;
489
490 sq = virtnet_xdp_sq(vi);
491
492 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
493 ret = -EINVAL;
494 drops = n;
495 goto out;
496 }
497
498 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
499 * indicate XDP resources have been successfully allocated.
500 */
501 xdp_prog = rcu_dereference(rq->xdp_prog);
502 if (!xdp_prog) {
503 ret = -ENXIO;
504 drops = n;
505 goto out;
506 }
507
508 /* Free up any pending old buffers before queueing new ones. */
509 while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL)
510 xdp_return_frame(xdpf_sent);
511
512 for (i = 0; i < n; i++) {
513 struct xdp_frame *xdpf = frames[i];
514
515 err = __virtnet_xdp_xmit_one(vi, sq, xdpf);
516 if (err) {
517 xdp_return_frame_rx_napi(xdpf);
518 drops++;
519 }
520 }
521 ret = n - drops;
522
523 if (flags & XDP_XMIT_FLUSH) {
524 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
525 kicks = 1;
526 }
527 out:
528 u64_stats_update_begin(&sq->stats.syncp);
529 sq->stats.xdp_tx += n;
530 sq->stats.xdp_tx_drops += drops;
531 sq->stats.kicks += kicks;
532 u64_stats_update_end(&sq->stats.syncp);
533
534 return ret;
535 }
536
537 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
538 {
539 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0;
540 }
541
542 /* We copy the packet for XDP in the following cases:
543 *
544 * 1) Packet is scattered across multiple rx buffers.
545 * 2) Headroom space is insufficient.
546 *
547 * This is inefficient but it's a temporary condition that
548 * we hit right after XDP is enabled and until queue is refilled
549 * with large buffers with sufficient headroom - so it should affect
550 * at most queue size packets.
551 * Afterwards, the conditions to enable
552 * XDP should preclude the underlying device from sending packets
553 * across multiple buffers (num_buf > 1), and we make sure buffers
554 * have enough headroom.
555 */
556 static struct page *xdp_linearize_page(struct receive_queue *rq,
557 u16 *num_buf,
558 struct page *p,
559 int offset,
560 int page_off,
561 unsigned int *len)
562 {
563 struct page *page = alloc_page(GFP_ATOMIC);
564
565 if (!page)
566 return NULL;
567
568 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
569 page_off += *len;
570
571 while (--*num_buf) {
572 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
573 unsigned int buflen;
574 void *buf;
575 int off;
576
577 buf = virtqueue_get_buf(rq->vq, &buflen);
578 if (unlikely(!buf))
579 goto err_buf;
580
581 p = virt_to_head_page(buf);
582 off = buf - page_address(p);
583
584 /* guard against a misconfigured or uncooperative backend that
585 * is sending packet larger than the MTU.
586 */
587 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
588 put_page(p);
589 goto err_buf;
590 }
591
592 memcpy(page_address(page) + page_off,
593 page_address(p) + off, buflen);
594 page_off += buflen;
595 put_page(p);
596 }
597
598 /* Headroom does not contribute to packet length */
599 *len = page_off - VIRTIO_XDP_HEADROOM;
600 return page;
601 err_buf:
602 __free_pages(page, 0);
603 return NULL;
604 }
605
606 static struct sk_buff *receive_small(struct net_device *dev,
607 struct virtnet_info *vi,
608 struct receive_queue *rq,
609 void *buf, void *ctx,
610 unsigned int len,
611 unsigned int *xdp_xmit,
612 struct virtnet_rq_stats *stats)
613 {
614 struct sk_buff *skb;
615 struct bpf_prog *xdp_prog;
616 unsigned int xdp_headroom = (unsigned long)ctx;
617 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
618 unsigned int headroom = vi->hdr_len + header_offset;
619 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
620 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
621 struct page *page = virt_to_head_page(buf);
622 unsigned int delta = 0;
623 struct page *xdp_page;
624 int err;
625
626 len -= vi->hdr_len;
627 stats->bytes += len;
628
629 rcu_read_lock();
630 xdp_prog = rcu_dereference(rq->xdp_prog);
631 if (xdp_prog) {
632 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
633 struct xdp_frame *xdpf;
634 struct xdp_buff xdp;
635 void *orig_data;
636 u32 act;
637
638 if (unlikely(hdr->hdr.gso_type))
639 goto err_xdp;
640
641 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
642 int offset = buf - page_address(page) + header_offset;
643 unsigned int tlen = len + vi->hdr_len;
644 u16 num_buf = 1;
645
646 xdp_headroom = virtnet_get_headroom(vi);
647 header_offset = VIRTNET_RX_PAD + xdp_headroom;
648 headroom = vi->hdr_len + header_offset;
649 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
650 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
651 xdp_page = xdp_linearize_page(rq, &num_buf, page,
652 offset, header_offset,
653 &tlen);
654 if (!xdp_page)
655 goto err_xdp;
656
657 buf = page_address(xdp_page);
658 put_page(page);
659 page = xdp_page;
660 }
661
662 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
663 xdp.data = xdp.data_hard_start + xdp_headroom;
664 xdp_set_data_meta_invalid(&xdp);
665 xdp.data_end = xdp.data + len;
666 xdp.rxq = &rq->xdp_rxq;
667 orig_data = xdp.data;
668 act = bpf_prog_run_xdp(xdp_prog, &xdp);
669 stats->xdp_packets++;
670
671 switch (act) {
672 case XDP_PASS:
673 /* Recalculate length in case bpf program changed it */
674 delta = orig_data - xdp.data;
675 len = xdp.data_end - xdp.data;
676 break;
677 case XDP_TX:
678 stats->xdp_tx++;
679 xdpf = convert_to_xdp_frame(&xdp);
680 if (unlikely(!xdpf))
681 goto err_xdp;
682 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
683 if (unlikely(err < 0)) {
684 trace_xdp_exception(vi->dev, xdp_prog, act);
685 goto err_xdp;
686 }
687 *xdp_xmit |= VIRTIO_XDP_TX;
688 rcu_read_unlock();
689 goto xdp_xmit;
690 case XDP_REDIRECT:
691 stats->xdp_redirects++;
692 err = xdp_do_redirect(dev, &xdp, xdp_prog);
693 if (err)
694 goto err_xdp;
695 *xdp_xmit |= VIRTIO_XDP_REDIR;
696 rcu_read_unlock();
697 goto xdp_xmit;
698 default:
699 bpf_warn_invalid_xdp_action(act);
700 /* fall through */
701 case XDP_ABORTED:
702 trace_xdp_exception(vi->dev, xdp_prog, act);
703 case XDP_DROP:
704 goto err_xdp;
705 }
706 }
707 rcu_read_unlock();
708
709 skb = build_skb(buf, buflen);
710 if (!skb) {
711 put_page(page);
712 goto err;
713 }
714 skb_reserve(skb, headroom - delta);
715 skb_put(skb, len);
716 if (!delta) {
717 buf += header_offset;
718 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
719 } /* keep zeroed vnet hdr since packet was changed by bpf */
720
721 err:
722 return skb;
723
724 err_xdp:
725 rcu_read_unlock();
726 stats->xdp_drops++;
727 stats->drops++;
728 put_page(page);
729 xdp_xmit:
730 return NULL;
731 }
732
733 static struct sk_buff *receive_big(struct net_device *dev,
734 struct virtnet_info *vi,
735 struct receive_queue *rq,
736 void *buf,
737 unsigned int len,
738 struct virtnet_rq_stats *stats)
739 {
740 struct page *page = buf;
741 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
742
743 stats->bytes += len - vi->hdr_len;
744 if (unlikely(!skb))
745 goto err;
746
747 return skb;
748
749 err:
750 stats->drops++;
751 give_pages(rq, page);
752 return NULL;
753 }
754
755 static struct sk_buff *receive_mergeable(struct net_device *dev,
756 struct virtnet_info *vi,
757 struct receive_queue *rq,
758 void *buf,
759 void *ctx,
760 unsigned int len,
761 unsigned int *xdp_xmit,
762 struct virtnet_rq_stats *stats)
763 {
764 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
765 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
766 struct page *page = virt_to_head_page(buf);
767 int offset = buf - page_address(page);
768 struct sk_buff *head_skb, *curr_skb;
769 struct bpf_prog *xdp_prog;
770 unsigned int truesize;
771 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
772 int err;
773
774 head_skb = NULL;
775 stats->bytes += len - vi->hdr_len;
776
777 rcu_read_lock();
778 xdp_prog = rcu_dereference(rq->xdp_prog);
779 if (xdp_prog) {
780 struct xdp_frame *xdpf;
781 struct page *xdp_page;
782 struct xdp_buff xdp;
783 void *data;
784 u32 act;
785
786 /* Transient failure which in theory could occur if
787 * in-flight packets from before XDP was enabled reach
788 * the receive path after XDP is loaded.
789 */
790 if (unlikely(hdr->hdr.gso_type))
791 goto err_xdp;
792
793 /* This happens when rx buffer size is underestimated
794 * or headroom is not enough because of the buffer
795 * was refilled before XDP is set. This should only
796 * happen for the first several packets, so we don't
797 * care much about its performance.
798 */
799 if (unlikely(num_buf > 1 ||
800 headroom < virtnet_get_headroom(vi))) {
801 /* linearize data for XDP */
802 xdp_page = xdp_linearize_page(rq, &num_buf,
803 page, offset,
804 VIRTIO_XDP_HEADROOM,
805 &len);
806 if (!xdp_page)
807 goto err_xdp;
808 offset = VIRTIO_XDP_HEADROOM;
809 } else {
810 xdp_page = page;
811 }
812
813 /* Allow consuming headroom but reserve enough space to push
814 * the descriptor on if we get an XDP_TX return code.
815 */
816 data = page_address(xdp_page) + offset;
817 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len;
818 xdp.data = data + vi->hdr_len;
819 xdp_set_data_meta_invalid(&xdp);
820 xdp.data_end = xdp.data + (len - vi->hdr_len);
821 xdp.rxq = &rq->xdp_rxq;
822
823 act = bpf_prog_run_xdp(xdp_prog, &xdp);
824 stats->xdp_packets++;
825
826 switch (act) {
827 case XDP_PASS:
828 /* recalculate offset to account for any header
829 * adjustments. Note other cases do not build an
830 * skb and avoid using offset
831 */
832 offset = xdp.data -
833 page_address(xdp_page) - vi->hdr_len;
834
835 /* recalculate len if xdp.data or xdp.data_end were
836 * adjusted
837 */
838 len = xdp.data_end - xdp.data + vi->hdr_len;
839 /* We can only create skb based on xdp_page. */
840 if (unlikely(xdp_page != page)) {
841 rcu_read_unlock();
842 put_page(page);
843 head_skb = page_to_skb(vi, rq, xdp_page,
844 offset, len, PAGE_SIZE);
845 return head_skb;
846 }
847 break;
848 case XDP_TX:
849 stats->xdp_tx++;
850 xdpf = convert_to_xdp_frame(&xdp);
851 if (unlikely(!xdpf))
852 goto err_xdp;
853 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
854 if (unlikely(err < 0)) {
855 trace_xdp_exception(vi->dev, xdp_prog, act);
856 if (unlikely(xdp_page != page))
857 put_page(xdp_page);
858 goto err_xdp;
859 }
860 *xdp_xmit |= VIRTIO_XDP_TX;
861 if (unlikely(xdp_page != page))
862 put_page(page);
863 rcu_read_unlock();
864 goto xdp_xmit;
865 case XDP_REDIRECT:
866 stats->xdp_redirects++;
867 err = xdp_do_redirect(dev, &xdp, xdp_prog);
868 if (err) {
869 if (unlikely(xdp_page != page))
870 put_page(xdp_page);
871 goto err_xdp;
872 }
873 *xdp_xmit |= VIRTIO_XDP_REDIR;
874 if (unlikely(xdp_page != page))
875 put_page(page);
876 rcu_read_unlock();
877 goto xdp_xmit;
878 default:
879 bpf_warn_invalid_xdp_action(act);
880 /* fall through */
881 case XDP_ABORTED:
882 trace_xdp_exception(vi->dev, xdp_prog, act);
883 /* fall through */
884 case XDP_DROP:
885 if (unlikely(xdp_page != page))
886 __free_pages(xdp_page, 0);
887 goto err_xdp;
888 }
889 }
890 rcu_read_unlock();
891
892 truesize = mergeable_ctx_to_truesize(ctx);
893 if (unlikely(len > truesize)) {
894 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
895 dev->name, len, (unsigned long)ctx);
896 dev->stats.rx_length_errors++;
897 goto err_skb;
898 }
899
900 head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
901 curr_skb = head_skb;
902
903 if (unlikely(!curr_skb))
904 goto err_skb;
905 while (--num_buf) {
906 int num_skb_frags;
907
908 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
909 if (unlikely(!buf)) {
910 pr_debug("%s: rx error: %d buffers out of %d missing\n",
911 dev->name, num_buf,
912 virtio16_to_cpu(vi->vdev,
913 hdr->num_buffers));
914 dev->stats.rx_length_errors++;
915 goto err_buf;
916 }
917
918 stats->bytes += len;
919 page = virt_to_head_page(buf);
920
921 truesize = mergeable_ctx_to_truesize(ctx);
922 if (unlikely(len > truesize)) {
923 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
924 dev->name, len, (unsigned long)ctx);
925 dev->stats.rx_length_errors++;
926 goto err_skb;
927 }
928
929 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
930 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
931 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
932
933 if (unlikely(!nskb))
934 goto err_skb;
935 if (curr_skb == head_skb)
936 skb_shinfo(curr_skb)->frag_list = nskb;
937 else
938 curr_skb->next = nskb;
939 curr_skb = nskb;
940 head_skb->truesize += nskb->truesize;
941 num_skb_frags = 0;
942 }
943 if (curr_skb != head_skb) {
944 head_skb->data_len += len;
945 head_skb->len += len;
946 head_skb->truesize += truesize;
947 }
948 offset = buf - page_address(page);
949 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
950 put_page(page);
951 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
952 len, truesize);
953 } else {
954 skb_add_rx_frag(curr_skb, num_skb_frags, page,
955 offset, len, truesize);
956 }
957 }
958
959 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
960 return head_skb;
961
962 err_xdp:
963 rcu_read_unlock();
964 stats->xdp_drops++;
965 err_skb:
966 put_page(page);
967 while (num_buf-- > 1) {
968 buf = virtqueue_get_buf(rq->vq, &len);
969 if (unlikely(!buf)) {
970 pr_debug("%s: rx error: %d buffers missing\n",
971 dev->name, num_buf);
972 dev->stats.rx_length_errors++;
973 break;
974 }
975 stats->bytes += len;
976 page = virt_to_head_page(buf);
977 put_page(page);
978 }
979 err_buf:
980 stats->drops++;
981 dev_kfree_skb(head_skb);
982 xdp_xmit:
983 return NULL;
984 }
985
986 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
987 void *buf, unsigned int len, void **ctx,
988 unsigned int *xdp_xmit,
989 struct virtnet_rq_stats *stats)
990 {
991 struct net_device *dev = vi->dev;
992 struct sk_buff *skb;
993 struct virtio_net_hdr_mrg_rxbuf *hdr;
994
995 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
996 pr_debug("%s: short packet %i\n", dev->name, len);
997 dev->stats.rx_length_errors++;
998 if (vi->mergeable_rx_bufs) {
999 put_page(virt_to_head_page(buf));
1000 } else if (vi->big_packets) {
1001 give_pages(rq, buf);
1002 } else {
1003 put_page(virt_to_head_page(buf));
1004 }
1005 return;
1006 }
1007
1008 if (vi->mergeable_rx_bufs)
1009 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
1010 stats);
1011 else if (vi->big_packets)
1012 skb = receive_big(dev, vi, rq, buf, len, stats);
1013 else
1014 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
1015
1016 if (unlikely(!skb))
1017 return;
1018
1019 hdr = skb_vnet_hdr(skb);
1020
1021 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
1022 skb->ip_summed = CHECKSUM_UNNECESSARY;
1023
1024 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
1025 virtio_is_little_endian(vi->vdev))) {
1026 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
1027 dev->name, hdr->hdr.gso_type,
1028 hdr->hdr.gso_size);
1029 goto frame_err;
1030 }
1031
1032 skb->protocol = eth_type_trans(skb, dev);
1033 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
1034 ntohs(skb->protocol), skb->len, skb->pkt_type);
1035
1036 napi_gro_receive(&rq->napi, skb);
1037 return;
1038
1039 frame_err:
1040 dev->stats.rx_frame_errors++;
1041 dev_kfree_skb(skb);
1042 }
1043
1044 /* Unlike mergeable buffers, all buffers are allocated to the
1045 * same size, except for the headroom. For this reason we do
1046 * not need to use mergeable_len_to_ctx here - it is enough
1047 * to store the headroom as the context ignoring the truesize.
1048 */
1049 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1050 gfp_t gfp)
1051 {
1052 struct page_frag *alloc_frag = &rq->alloc_frag;
1053 char *buf;
1054 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1055 void *ctx = (void *)(unsigned long)xdp_headroom;
1056 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1057 int err;
1058
1059 len = SKB_DATA_ALIGN(len) +
1060 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1061 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
1062 return -ENOMEM;
1063
1064 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1065 get_page(alloc_frag->page);
1066 alloc_frag->offset += len;
1067 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,
1068 vi->hdr_len + GOOD_PACKET_LEN);
1069 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1070 if (err < 0)
1071 put_page(virt_to_head_page(buf));
1072 return err;
1073 }
1074
1075 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1076 gfp_t gfp)
1077 {
1078 struct page *first, *list = NULL;
1079 char *p;
1080 int i, err, offset;
1081
1082 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
1083
1084 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
1085 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
1086 first = get_a_page(rq, gfp);
1087 if (!first) {
1088 if (list)
1089 give_pages(rq, list);
1090 return -ENOMEM;
1091 }
1092 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1093
1094 /* chain new page in list head to match sg */
1095 first->private = (unsigned long)list;
1096 list = first;
1097 }
1098
1099 first = get_a_page(rq, gfp);
1100 if (!first) {
1101 give_pages(rq, list);
1102 return -ENOMEM;
1103 }
1104 p = page_address(first);
1105
1106 /* rq->sg[0], rq->sg[1] share the same page */
1107 /* a separated rq->sg[0] for header - required in case !any_header_sg */
1108 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1109
1110 /* rq->sg[1] for data packet, from offset */
1111 offset = sizeof(struct padded_vnet_hdr);
1112 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1113
1114 /* chain first in list head */
1115 first->private = (unsigned long)list;
1116 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
1117 first, gfp);
1118 if (err < 0)
1119 give_pages(rq, first);
1120
1121 return err;
1122 }
1123
1124 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1125 struct ewma_pkt_len *avg_pkt_len,
1126 unsigned int room)
1127 {
1128 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1129 unsigned int len;
1130
1131 if (room)
1132 return PAGE_SIZE - room;
1133
1134 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1135 rq->min_buf_len, PAGE_SIZE - hdr_len);
1136
1137 return ALIGN(len, L1_CACHE_BYTES);
1138 }
1139
1140 static int add_recvbuf_mergeable(struct virtnet_info *vi,
1141 struct receive_queue *rq, gfp_t gfp)
1142 {
1143 struct page_frag *alloc_frag = &rq->alloc_frag;
1144 unsigned int headroom = virtnet_get_headroom(vi);
1145 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1146 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1147 char *buf;
1148 void *ctx;
1149 int err;
1150 unsigned int len, hole;
1151
1152 /* Extra tailroom is needed to satisfy XDP's assumption. This
1153 * means rx frags coalescing won't work, but consider we've
1154 * disabled GSO for XDP, it won't be a big issue.
1155 */
1156 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1157 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
1158 return -ENOMEM;
1159
1160 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1161 buf += headroom; /* advance address leaving hole at front of pkt */
1162 get_page(alloc_frag->page);
1163 alloc_frag->offset += len + room;
1164 hole = alloc_frag->size - alloc_frag->offset;
1165 if (hole < len + room) {
1166 /* To avoid internal fragmentation, if there is very likely not
1167 * enough space for another buffer, add the remaining space to
1168 * the current buffer.
1169 */
1170 len += hole;
1171 alloc_frag->offset += hole;
1172 }
1173
1174 sg_init_one(rq->sg, buf, len);
1175 ctx = mergeable_len_to_ctx(len, headroom);
1176 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1177 if (err < 0)
1178 put_page(virt_to_head_page(buf));
1179
1180 return err;
1181 }
1182
1183 /*
1184 * Returns false if we couldn't fill entirely (OOM).
1185 *
1186 * Normally run in the receive path, but can also be run from ndo_open
1187 * before we're receiving packets, or from refill_work which is
1188 * careful to disable receiving (using napi_disable).
1189 */
1190 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
1191 gfp_t gfp)
1192 {
1193 int err;
1194 bool oom;
1195
1196 do {
1197 if (vi->mergeable_rx_bufs)
1198 err = add_recvbuf_mergeable(vi, rq, gfp);
1199 else if (vi->big_packets)
1200 err = add_recvbuf_big(vi, rq, gfp);
1201 else
1202 err = add_recvbuf_small(vi, rq, gfp);
1203
1204 oom = err == -ENOMEM;
1205 if (err)
1206 break;
1207 } while (rq->vq->num_free);
1208 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
1209 u64_stats_update_begin(&rq->stats.syncp);
1210 rq->stats.kicks++;
1211 u64_stats_update_end(&rq->stats.syncp);
1212 }
1213
1214 return !oom;
1215 }
1216
1217 static void skb_recv_done(struct virtqueue *rvq)
1218 {
1219 struct virtnet_info *vi = rvq->vdev->priv;
1220 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
1221
1222 virtqueue_napi_schedule(&rq->napi, rvq);
1223 }
1224
1225 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
1226 {
1227 napi_enable(napi);
1228
1229 /* If all buffers were filled by other side before we napi_enabled, we
1230 * won't get another interrupt, so process any outstanding packets now.
1231 * Call local_bh_enable after to trigger softIRQ processing.
1232 */
1233 local_bh_disable();
1234 virtqueue_napi_schedule(napi, vq);
1235 local_bh_enable();
1236 }
1237
1238 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
1239 struct virtqueue *vq,
1240 struct napi_struct *napi)
1241 {
1242 if (!napi->weight)
1243 return;
1244
1245 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
1246 * enable the feature if this is likely affine with the transmit path.
1247 */
1248 if (!vi->affinity_hint_set) {
1249 napi->weight = 0;
1250 return;
1251 }
1252
1253 return virtnet_napi_enable(vq, napi);
1254 }
1255
1256 static void virtnet_napi_tx_disable(struct napi_struct *napi)
1257 {
1258 if (napi->weight)
1259 napi_disable(napi);
1260 }
1261
1262 static void refill_work(struct work_struct *work)
1263 {
1264 struct virtnet_info *vi =
1265 container_of(work, struct virtnet_info, refill.work);
1266 bool still_empty;
1267 int i;
1268
1269 for (i = 0; i < vi->curr_queue_pairs; i++) {
1270 struct receive_queue *rq = &vi->rq[i];
1271
1272 napi_disable(&rq->napi);
1273 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
1274 virtnet_napi_enable(rq->vq, &rq->napi);
1275
1276 /* In theory, this can happen: if we don't get any buffers in
1277 * we will *never* try to fill again.
1278 */
1279 if (still_empty)
1280 schedule_delayed_work(&vi->refill, HZ/2);
1281 }
1282 }
1283
1284 static int virtnet_receive(struct receive_queue *rq, int budget,
1285 unsigned int *xdp_xmit)
1286 {
1287 struct virtnet_info *vi = rq->vq->vdev->priv;
1288 struct virtnet_rq_stats stats = {};
1289 unsigned int len;
1290 void *buf;
1291 int i;
1292
1293 if (!vi->big_packets || vi->mergeable_rx_bufs) {
1294 void *ctx;
1295
1296 while (stats.packets < budget &&
1297 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
1298 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
1299 stats.packets++;
1300 }
1301 } else {
1302 while (stats.packets < budget &&
1303 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
1304 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
1305 stats.packets++;
1306 }
1307 }
1308
1309 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
1310 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
1311 schedule_delayed_work(&vi->refill, 0);
1312 }
1313
1314 u64_stats_update_begin(&rq->stats.syncp);
1315 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
1316 size_t offset = virtnet_rq_stats_desc[i].offset;
1317 u64 *item;
1318
1319 item = (u64 *)((u8 *)&rq->stats + offset);
1320 *item += *(u64 *)((u8 *)&stats + offset);
1321 }
1322 u64_stats_update_end(&rq->stats.syncp);
1323
1324 return stats.packets;
1325 }
1326
1327 static void free_old_xmit_skbs(struct send_queue *sq)
1328 {
1329 struct sk_buff *skb;
1330 unsigned int len;
1331 unsigned int packets = 0;
1332 unsigned int bytes = 0;
1333
1334 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1335 pr_debug("Sent skb %p\n", skb);
1336
1337 bytes += skb->len;
1338 packets++;
1339
1340 dev_consume_skb_any(skb);
1341 }
1342
1343 /* Avoid overhead when no packets have been processed
1344 * happens when called speculatively from start_xmit.
1345 */
1346 if (!packets)
1347 return;
1348
1349 u64_stats_update_begin(&sq->stats.syncp);
1350 sq->stats.bytes += bytes;
1351 sq->stats.packets += packets;
1352 u64_stats_update_end(&sq->stats.syncp);
1353 }
1354
1355 static void virtnet_poll_cleantx(struct receive_queue *rq)
1356 {
1357 struct virtnet_info *vi = rq->vq->vdev->priv;
1358 unsigned int index = vq2rxq(rq->vq);
1359 struct send_queue *sq = &vi->sq[index];
1360 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
1361
1362 if (!sq->napi.weight)
1363 return;
1364
1365 if (__netif_tx_trylock(txq)) {
1366 free_old_xmit_skbs(sq);
1367 __netif_tx_unlock(txq);
1368 }
1369
1370 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1371 netif_tx_wake_queue(txq);
1372 }
1373
1374 static int virtnet_poll(struct napi_struct *napi, int budget)
1375 {
1376 struct receive_queue *rq =
1377 container_of(napi, struct receive_queue, napi);
1378 struct virtnet_info *vi = rq->vq->vdev->priv;
1379 struct send_queue *sq;
1380 unsigned int received;
1381 unsigned int xdp_xmit = 0;
1382
1383 virtnet_poll_cleantx(rq);
1384
1385 received = virtnet_receive(rq, budget, &xdp_xmit);
1386
1387 /* Out of packets? */
1388 if (received < budget)
1389 virtqueue_napi_complete(napi, rq->vq, received);
1390
1391 if (xdp_xmit & VIRTIO_XDP_REDIR)
1392 xdp_do_flush_map();
1393
1394 if (xdp_xmit & VIRTIO_XDP_TX) {
1395 sq = virtnet_xdp_sq(vi);
1396 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1397 u64_stats_update_begin(&sq->stats.syncp);
1398 sq->stats.kicks++;
1399 u64_stats_update_end(&sq->stats.syncp);
1400 }
1401 }
1402
1403 return received;
1404 }
1405
1406 static int virtnet_open(struct net_device *dev)
1407 {
1408 struct virtnet_info *vi = netdev_priv(dev);
1409 int i, err;
1410
1411 for (i = 0; i < vi->max_queue_pairs; i++) {
1412 if (i < vi->curr_queue_pairs)
1413 /* Make sure we have some buffers: if oom use wq. */
1414 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1415 schedule_delayed_work(&vi->refill, 0);
1416
1417 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i);
1418 if (err < 0)
1419 return err;
1420
1421 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
1422 MEM_TYPE_PAGE_SHARED, NULL);
1423 if (err < 0) {
1424 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1425 return err;
1426 }
1427
1428 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
1429 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
1430 }
1431
1432 return 0;
1433 }
1434
1435 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
1436 {
1437 struct send_queue *sq = container_of(napi, struct send_queue, napi);
1438 struct virtnet_info *vi = sq->vq->vdev->priv;
1439 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq));
1440
1441 __netif_tx_lock(txq, raw_smp_processor_id());
1442 free_old_xmit_skbs(sq);
1443 __netif_tx_unlock(txq);
1444
1445 virtqueue_napi_complete(napi, sq->vq, 0);
1446
1447 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1448 netif_tx_wake_queue(txq);
1449
1450 return 0;
1451 }
1452
1453 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1454 {
1455 struct virtio_net_hdr_mrg_rxbuf *hdr;
1456 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1457 struct virtnet_info *vi = sq->vq->vdev->priv;
1458 int num_sg;
1459 unsigned hdr_len = vi->hdr_len;
1460 bool can_push;
1461
1462 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1463
1464 can_push = vi->any_header_sg &&
1465 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1466 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1467 /* Even if we can, don't push here yet as this would skew
1468 * csum_start offset below. */
1469 if (can_push)
1470 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1471 else
1472 hdr = skb_vnet_hdr(skb);
1473
1474 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1475 virtio_is_little_endian(vi->vdev), false,
1476 0))
1477 BUG();
1478
1479 if (vi->mergeable_rx_bufs)
1480 hdr->num_buffers = 0;
1481
1482 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1483 if (can_push) {
1484 __skb_push(skb, hdr_len);
1485 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1486 if (unlikely(num_sg < 0))
1487 return num_sg;
1488 /* Pull header back to avoid skew in tx bytes calculations. */
1489 __skb_pull(skb, hdr_len);
1490 } else {
1491 sg_set_buf(sq->sg, hdr, hdr_len);
1492 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
1493 if (unlikely(num_sg < 0))
1494 return num_sg;
1495 num_sg++;
1496 }
1497 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1498 }
1499
1500 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1501 {
1502 struct virtnet_info *vi = netdev_priv(dev);
1503 int qnum = skb_get_queue_mapping(skb);
1504 struct send_queue *sq = &vi->sq[qnum];
1505 int err;
1506 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1507 bool kick = !skb->xmit_more;
1508 bool use_napi = sq->napi.weight;
1509
1510 /* Free up any pending old buffers before queueing new ones. */
1511 free_old_xmit_skbs(sq);
1512
1513 if (use_napi && kick)
1514 virtqueue_enable_cb_delayed(sq->vq);
1515
1516 /* timestamp packet in software */
1517 skb_tx_timestamp(skb);
1518
1519 /* Try to transmit */
1520 err = xmit_skb(sq, skb);
1521
1522 /* This should not happen! */
1523 if (unlikely(err)) {
1524 dev->stats.tx_fifo_errors++;
1525 if (net_ratelimit())
1526 dev_warn(&dev->dev,
1527 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
1528 dev->stats.tx_dropped++;
1529 dev_kfree_skb_any(skb);
1530 return NETDEV_TX_OK;
1531 }
1532
1533 /* Don't wait up for transmitted skbs to be freed. */
1534 if (!use_napi) {
1535 skb_orphan(skb);
1536 nf_reset(skb);
1537 }
1538
1539 /* If running out of space, stop queue to avoid getting packets that we
1540 * are then unable to transmit.
1541 * An alternative would be to force queuing layer to requeue the skb by
1542 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1543 * returned in a normal path of operation: it means that driver is not
1544 * maintaining the TX queue stop/start state properly, and causes
1545 * the stack to do a non-trivial amount of useless work.
1546 * Since most packets only take 1 or 2 ring slots, stopping the queue
1547 * early means 16 slots are typically wasted.
1548 */
1549 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1550 netif_stop_subqueue(dev, qnum);
1551 if (!use_napi &&
1552 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1553 /* More just got used, free them then recheck. */
1554 free_old_xmit_skbs(sq);
1555 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1556 netif_start_subqueue(dev, qnum);
1557 virtqueue_disable_cb(sq->vq);
1558 }
1559 }
1560 }
1561
1562 if (kick || netif_xmit_stopped(txq)) {
1563 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1564 u64_stats_update_begin(&sq->stats.syncp);
1565 sq->stats.kicks++;
1566 u64_stats_update_end(&sq->stats.syncp);
1567 }
1568 }
1569
1570 return NETDEV_TX_OK;
1571 }
1572
1573 /*
1574 * Send command via the control virtqueue and check status. Commands
1575 * supported by the hypervisor, as indicated by feature bits, should
1576 * never fail unless improperly formatted.
1577 */
1578 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1579 struct scatterlist *out)
1580 {
1581 struct scatterlist *sgs[4], hdr, stat;
1582 unsigned out_num = 0, tmp;
1583
1584 /* Caller should know better */
1585 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1586
1587 vi->ctrl->status = ~0;
1588 vi->ctrl->hdr.class = class;
1589 vi->ctrl->hdr.cmd = cmd;
1590 /* Add header */
1591 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
1592 sgs[out_num++] = &hdr;
1593
1594 if (out)
1595 sgs[out_num++] = out;
1596
1597 /* Add return status. */
1598 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
1599 sgs[out_num] = &stat;
1600
1601 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1602 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1603
1604 if (unlikely(!virtqueue_kick(vi->cvq)))
1605 return vi->ctrl->status == VIRTIO_NET_OK;
1606
1607 /* Spin for a response, the kick causes an ioport write, trapping
1608 * into the hypervisor, so the request should be handled immediately.
1609 */
1610 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1611 !virtqueue_is_broken(vi->cvq))
1612 cpu_relax();
1613
1614 return vi->ctrl->status == VIRTIO_NET_OK;
1615 }
1616
1617 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1618 {
1619 struct virtnet_info *vi = netdev_priv(dev);
1620 struct virtio_device *vdev = vi->vdev;
1621 int ret;
1622 struct sockaddr *addr;
1623 struct scatterlist sg;
1624
1625 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
1626 return -EOPNOTSUPP;
1627
1628 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
1629 if (!addr)
1630 return -ENOMEM;
1631
1632 ret = eth_prepare_mac_addr_change(dev, addr);
1633 if (ret)
1634 goto out;
1635
1636 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1637 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1638 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1639 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1640 dev_warn(&vdev->dev,
1641 "Failed to set mac address by vq command.\n");
1642 ret = -EINVAL;
1643 goto out;
1644 }
1645 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1646 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1647 unsigned int i;
1648
1649 /* Naturally, this has an atomicity problem. */
1650 for (i = 0; i < dev->addr_len; i++)
1651 virtio_cwrite8(vdev,
1652 offsetof(struct virtio_net_config, mac) +
1653 i, addr->sa_data[i]);
1654 }
1655
1656 eth_commit_mac_addr_change(dev, p);
1657 ret = 0;
1658
1659 out:
1660 kfree(addr);
1661 return ret;
1662 }
1663
1664 static void virtnet_stats(struct net_device *dev,
1665 struct rtnl_link_stats64 *tot)
1666 {
1667 struct virtnet_info *vi = netdev_priv(dev);
1668 unsigned int start;
1669 int i;
1670
1671 for (i = 0; i < vi->max_queue_pairs; i++) {
1672 u64 tpackets, tbytes, rpackets, rbytes, rdrops;
1673 struct receive_queue *rq = &vi->rq[i];
1674 struct send_queue *sq = &vi->sq[i];
1675
1676 do {
1677 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
1678 tpackets = sq->stats.packets;
1679 tbytes = sq->stats.bytes;
1680 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
1681
1682 do {
1683 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
1684 rpackets = rq->stats.packets;
1685 rbytes = rq->stats.bytes;
1686 rdrops = rq->stats.drops;
1687 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
1688
1689 tot->rx_packets += rpackets;
1690 tot->tx_packets += tpackets;
1691 tot->rx_bytes += rbytes;
1692 tot->tx_bytes += tbytes;
1693 tot->rx_dropped += rdrops;
1694 }
1695
1696 tot->tx_dropped = dev->stats.tx_dropped;
1697 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1698 tot->rx_length_errors = dev->stats.rx_length_errors;
1699 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1700 }
1701
1702 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1703 {
1704 rtnl_lock();
1705 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1706 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1707 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1708 rtnl_unlock();
1709 }
1710
1711 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1712 {
1713 struct scatterlist sg;
1714 struct net_device *dev = vi->dev;
1715
1716 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1717 return 0;
1718
1719 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1720 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
1721
1722 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1723 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1724 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1725 queue_pairs);
1726 return -EINVAL;
1727 } else {
1728 vi->curr_queue_pairs = queue_pairs;
1729 /* virtnet_open() will refill when device is going to up. */
1730 if (dev->flags & IFF_UP)
1731 schedule_delayed_work(&vi->refill, 0);
1732 }
1733
1734 return 0;
1735 }
1736
1737 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1738 {
1739 int err;
1740
1741 rtnl_lock();
1742 err = _virtnet_set_queues(vi, queue_pairs);
1743 rtnl_unlock();
1744 return err;
1745 }
1746
1747 static int virtnet_close(struct net_device *dev)
1748 {
1749 struct virtnet_info *vi = netdev_priv(dev);
1750 int i;
1751
1752 /* Make sure refill_work doesn't re-enable napi! */
1753 cancel_delayed_work_sync(&vi->refill);
1754
1755 for (i = 0; i < vi->max_queue_pairs; i++) {
1756 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1757 napi_disable(&vi->rq[i].napi);
1758 virtnet_napi_tx_disable(&vi->sq[i].napi);
1759 }
1760
1761 return 0;
1762 }
1763
1764 static void virtnet_set_rx_mode(struct net_device *dev)
1765 {
1766 struct virtnet_info *vi = netdev_priv(dev);
1767 struct scatterlist sg[2];
1768 struct virtio_net_ctrl_mac *mac_data;
1769 struct netdev_hw_addr *ha;
1770 int uc_count;
1771 int mc_count;
1772 void *buf;
1773 int i;
1774
1775 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1776 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1777 return;
1778
1779 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
1780 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1781
1782 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
1783
1784 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1785 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1786 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1787 vi->ctrl->promisc ? "en" : "dis");
1788
1789 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
1790
1791 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1792 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1793 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1794 vi->ctrl->allmulti ? "en" : "dis");
1795
1796 uc_count = netdev_uc_count(dev);
1797 mc_count = netdev_mc_count(dev);
1798 /* MAC filter - use one buffer for both lists */
1799 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1800 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1801 mac_data = buf;
1802 if (!buf)
1803 return;
1804
1805 sg_init_table(sg, 2);
1806
1807 /* Store the unicast list and count in the front of the buffer */
1808 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1809 i = 0;
1810 netdev_for_each_uc_addr(ha, dev)
1811 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1812
1813 sg_set_buf(&sg[0], mac_data,
1814 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1815
1816 /* multicast list and count fill the end */
1817 mac_data = (void *)&mac_data->macs[uc_count][0];
1818
1819 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1820 i = 0;
1821 netdev_for_each_mc_addr(ha, dev)
1822 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1823
1824 sg_set_buf(&sg[1], mac_data,
1825 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1826
1827 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1828 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1829 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1830
1831 kfree(buf);
1832 }
1833
1834 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1835 __be16 proto, u16 vid)
1836 {
1837 struct virtnet_info *vi = netdev_priv(dev);
1838 struct scatterlist sg;
1839
1840 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1841 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1842
1843 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1844 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1845 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1846 return 0;
1847 }
1848
1849 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1850 __be16 proto, u16 vid)
1851 {
1852 struct virtnet_info *vi = netdev_priv(dev);
1853 struct scatterlist sg;
1854
1855 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1856 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1857
1858 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1859 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1860 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1861 return 0;
1862 }
1863
1864 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1865 {
1866 int i;
1867
1868 if (vi->affinity_hint_set) {
1869 for (i = 0; i < vi->max_queue_pairs; i++) {
1870 virtqueue_set_affinity(vi->rq[i].vq, NULL);
1871 virtqueue_set_affinity(vi->sq[i].vq, NULL);
1872 }
1873
1874 vi->affinity_hint_set = false;
1875 }
1876 }
1877
1878 static void virtnet_set_affinity(struct virtnet_info *vi)
1879 {
1880 cpumask_var_t mask;
1881 int stragglers;
1882 int group_size;
1883 int i, j, cpu;
1884 int num_cpu;
1885 int stride;
1886
1887 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
1888 virtnet_clean_affinity(vi, -1);
1889 return;
1890 }
1891
1892 num_cpu = num_online_cpus();
1893 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
1894 stragglers = num_cpu >= vi->curr_queue_pairs ?
1895 num_cpu % vi->curr_queue_pairs :
1896 0;
1897 cpu = cpumask_next(-1, cpu_online_mask);
1898
1899 for (i = 0; i < vi->curr_queue_pairs; i++) {
1900 group_size = stride + (i < stragglers ? 1 : 0);
1901
1902 for (j = 0; j < group_size; j++) {
1903 cpumask_set_cpu(cpu, mask);
1904 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
1905 nr_cpu_ids, false);
1906 }
1907 virtqueue_set_affinity(vi->rq[i].vq, mask);
1908 virtqueue_set_affinity(vi->sq[i].vq, mask);
1909 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false);
1910 cpumask_clear(mask);
1911 }
1912
1913 vi->affinity_hint_set = true;
1914 free_cpumask_var(mask);
1915 }
1916
1917 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
1918 {
1919 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1920 node);
1921 virtnet_set_affinity(vi);
1922 return 0;
1923 }
1924
1925 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
1926 {
1927 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1928 node_dead);
1929 virtnet_set_affinity(vi);
1930 return 0;
1931 }
1932
1933 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
1934 {
1935 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1936 node);
1937
1938 virtnet_clean_affinity(vi, cpu);
1939 return 0;
1940 }
1941
1942 static enum cpuhp_state virtionet_online;
1943
1944 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
1945 {
1946 int ret;
1947
1948 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
1949 if (ret)
1950 return ret;
1951 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1952 &vi->node_dead);
1953 if (!ret)
1954 return ret;
1955 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1956 return ret;
1957 }
1958
1959 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
1960 {
1961 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1962 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1963 &vi->node_dead);
1964 }
1965
1966 static void virtnet_get_ringparam(struct net_device *dev,
1967 struct ethtool_ringparam *ring)
1968 {
1969 struct virtnet_info *vi = netdev_priv(dev);
1970
1971 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1972 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1973 ring->rx_pending = ring->rx_max_pending;
1974 ring->tx_pending = ring->tx_max_pending;
1975 }
1976
1977
1978 static void virtnet_get_drvinfo(struct net_device *dev,
1979 struct ethtool_drvinfo *info)
1980 {
1981 struct virtnet_info *vi = netdev_priv(dev);
1982 struct virtio_device *vdev = vi->vdev;
1983
1984 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1985 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1986 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1987
1988 }
1989
1990 /* TODO: Eliminate OOO packets during switching */
1991 static int virtnet_set_channels(struct net_device *dev,
1992 struct ethtool_channels *channels)
1993 {
1994 struct virtnet_info *vi = netdev_priv(dev);
1995 u16 queue_pairs = channels->combined_count;
1996 int err;
1997
1998 /* We don't support separate rx/tx channels.
1999 * We don't allow setting 'other' channels.
2000 */
2001 if (channels->rx_count || channels->tx_count || channels->other_count)
2002 return -EINVAL;
2003
2004 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
2005 return -EINVAL;
2006
2007 /* For now we don't support modifying channels while XDP is loaded
2008 * also when XDP is loaded all RX queues have XDP programs so we only
2009 * need to check a single RX queue.
2010 */
2011 if (vi->rq[0].xdp_prog)
2012 return -EINVAL;
2013
2014 get_online_cpus();
2015 err = _virtnet_set_queues(vi, queue_pairs);
2016 if (!err) {
2017 netif_set_real_num_tx_queues(dev, queue_pairs);
2018 netif_set_real_num_rx_queues(dev, queue_pairs);
2019
2020 virtnet_set_affinity(vi);
2021 }
2022 put_online_cpus();
2023
2024 return err;
2025 }
2026
2027 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2028 {
2029 struct virtnet_info *vi = netdev_priv(dev);
2030 char *p = (char *)data;
2031 unsigned int i, j;
2032
2033 switch (stringset) {
2034 case ETH_SS_STATS:
2035 for (i = 0; i < vi->curr_queue_pairs; i++) {
2036 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2037 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s",
2038 i, virtnet_rq_stats_desc[j].desc);
2039 p += ETH_GSTRING_LEN;
2040 }
2041 }
2042
2043 for (i = 0; i < vi->curr_queue_pairs; i++) {
2044 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2045 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s",
2046 i, virtnet_sq_stats_desc[j].desc);
2047 p += ETH_GSTRING_LEN;
2048 }
2049 }
2050 break;
2051 }
2052 }
2053
2054 static int virtnet_get_sset_count(struct net_device *dev, int sset)
2055 {
2056 struct virtnet_info *vi = netdev_priv(dev);
2057
2058 switch (sset) {
2059 case ETH_SS_STATS:
2060 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
2061 VIRTNET_SQ_STATS_LEN);
2062 default:
2063 return -EOPNOTSUPP;
2064 }
2065 }
2066
2067 static void virtnet_get_ethtool_stats(struct net_device *dev,
2068 struct ethtool_stats *stats, u64 *data)
2069 {
2070 struct virtnet_info *vi = netdev_priv(dev);
2071 unsigned int idx = 0, start, i, j;
2072 const u8 *stats_base;
2073 size_t offset;
2074
2075 for (i = 0; i < vi->curr_queue_pairs; i++) {
2076 struct receive_queue *rq = &vi->rq[i];
2077
2078 stats_base = (u8 *)&rq->stats;
2079 do {
2080 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
2081 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2082 offset = virtnet_rq_stats_desc[j].offset;
2083 data[idx + j] = *(u64 *)(stats_base + offset);
2084 }
2085 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
2086 idx += VIRTNET_RQ_STATS_LEN;
2087 }
2088
2089 for (i = 0; i < vi->curr_queue_pairs; i++) {
2090 struct send_queue *sq = &vi->sq[i];
2091
2092 stats_base = (u8 *)&sq->stats;
2093 do {
2094 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
2095 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2096 offset = virtnet_sq_stats_desc[j].offset;
2097 data[idx + j] = *(u64 *)(stats_base + offset);
2098 }
2099 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
2100 idx += VIRTNET_SQ_STATS_LEN;
2101 }
2102 }
2103
2104 static void virtnet_get_channels(struct net_device *dev,
2105 struct ethtool_channels *channels)
2106 {
2107 struct virtnet_info *vi = netdev_priv(dev);
2108
2109 channels->combined_count = vi->curr_queue_pairs;
2110 channels->max_combined = vi->max_queue_pairs;
2111 channels->max_other = 0;
2112 channels->rx_count = 0;
2113 channels->tx_count = 0;
2114 channels->other_count = 0;
2115 }
2116
2117 /* Check if the user is trying to change anything besides speed/duplex */
2118 static bool
2119 virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd)
2120 {
2121 struct ethtool_link_ksettings diff1 = *cmd;
2122 struct ethtool_link_ksettings diff2 = {};
2123
2124 /* cmd is always set so we need to clear it, validate the port type
2125 * and also without autonegotiation we can ignore advertising
2126 */
2127 diff1.base.speed = 0;
2128 diff2.base.port = PORT_OTHER;
2129 ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
2130 diff1.base.duplex = 0;
2131 diff1.base.cmd = 0;
2132 diff1.base.link_mode_masks_nwords = 0;
2133
2134 return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) &&
2135 bitmap_empty(diff1.link_modes.supported,
2136 __ETHTOOL_LINK_MODE_MASK_NBITS) &&
2137 bitmap_empty(diff1.link_modes.advertising,
2138 __ETHTOOL_LINK_MODE_MASK_NBITS) &&
2139 bitmap_empty(diff1.link_modes.lp_advertising,
2140 __ETHTOOL_LINK_MODE_MASK_NBITS);
2141 }
2142
2143 static int virtnet_set_link_ksettings(struct net_device *dev,
2144 const struct ethtool_link_ksettings *cmd)
2145 {
2146 struct virtnet_info *vi = netdev_priv(dev);
2147 u32 speed;
2148
2149 speed = cmd->base.speed;
2150 /* don't allow custom speed and duplex */
2151 if (!ethtool_validate_speed(speed) ||
2152 !ethtool_validate_duplex(cmd->base.duplex) ||
2153 !virtnet_validate_ethtool_cmd(cmd))
2154 return -EINVAL;
2155 vi->speed = speed;
2156 vi->duplex = cmd->base.duplex;
2157
2158 return 0;
2159 }
2160
2161 static int virtnet_get_link_ksettings(struct net_device *dev,
2162 struct ethtool_link_ksettings *cmd)
2163 {
2164 struct virtnet_info *vi = netdev_priv(dev);
2165
2166 cmd->base.speed = vi->speed;
2167 cmd->base.duplex = vi->duplex;
2168 cmd->base.port = PORT_OTHER;
2169
2170 return 0;
2171 }
2172
2173 static int virtnet_set_coalesce(struct net_device *dev,
2174 struct ethtool_coalesce *ec)
2175 {
2176 struct ethtool_coalesce ec_default = {
2177 .cmd = ETHTOOL_SCOALESCE,
2178 .rx_max_coalesced_frames = 1,
2179 };
2180 struct virtnet_info *vi = netdev_priv(dev);
2181 int i, napi_weight;
2182
2183 if (ec->tx_max_coalesced_frames > 1)
2184 return -EINVAL;
2185
2186 ec_default.tx_max_coalesced_frames = ec->tx_max_coalesced_frames;
2187 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
2188
2189 /* disallow changes to fields not explicitly tested above */
2190 if (memcmp(ec, &ec_default, sizeof(ec_default)))
2191 return -EINVAL;
2192
2193 if (napi_weight ^ vi->sq[0].napi.weight) {
2194 if (dev->flags & IFF_UP)
2195 return -EBUSY;
2196 for (i = 0; i < vi->max_queue_pairs; i++)
2197 vi->sq[i].napi.weight = napi_weight;
2198 }
2199
2200 return 0;
2201 }
2202
2203 static int virtnet_get_coalesce(struct net_device *dev,
2204 struct ethtool_coalesce *ec)
2205 {
2206 struct ethtool_coalesce ec_default = {
2207 .cmd = ETHTOOL_GCOALESCE,
2208 .rx_max_coalesced_frames = 1,
2209 };
2210 struct virtnet_info *vi = netdev_priv(dev);
2211
2212 memcpy(ec, &ec_default, sizeof(ec_default));
2213
2214 if (vi->sq[0].napi.weight)
2215 ec->tx_max_coalesced_frames = 1;
2216
2217 return 0;
2218 }
2219
2220 static void virtnet_init_settings(struct net_device *dev)
2221 {
2222 struct virtnet_info *vi = netdev_priv(dev);
2223
2224 vi->speed = SPEED_UNKNOWN;
2225 vi->duplex = DUPLEX_UNKNOWN;
2226 }
2227
2228 static void virtnet_update_settings(struct virtnet_info *vi)
2229 {
2230 u32 speed;
2231 u8 duplex;
2232
2233 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
2234 return;
2235
2236 speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config,
2237 speed));
2238 if (ethtool_validate_speed(speed))
2239 vi->speed = speed;
2240 duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config,
2241 duplex));
2242 if (ethtool_validate_duplex(duplex))
2243 vi->duplex = duplex;
2244 }
2245
2246 static const struct ethtool_ops virtnet_ethtool_ops = {
2247 .get_drvinfo = virtnet_get_drvinfo,
2248 .get_link = ethtool_op_get_link,
2249 .get_ringparam = virtnet_get_ringparam,
2250 .get_strings = virtnet_get_strings,
2251 .get_sset_count = virtnet_get_sset_count,
2252 .get_ethtool_stats = virtnet_get_ethtool_stats,
2253 .set_channels = virtnet_set_channels,
2254 .get_channels = virtnet_get_channels,
2255 .get_ts_info = ethtool_op_get_ts_info,
2256 .get_link_ksettings = virtnet_get_link_ksettings,
2257 .set_link_ksettings = virtnet_set_link_ksettings,
2258 .set_coalesce = virtnet_set_coalesce,
2259 .get_coalesce = virtnet_get_coalesce,
2260 };
2261
2262 static void virtnet_freeze_down(struct virtio_device *vdev)
2263 {
2264 struct virtnet_info *vi = vdev->priv;
2265 int i;
2266
2267 /* Make sure no work handler is accessing the device */
2268 flush_work(&vi->config_work);
2269
2270 netif_tx_lock_bh(vi->dev);
2271 netif_device_detach(vi->dev);
2272 netif_tx_unlock_bh(vi->dev);
2273 cancel_delayed_work_sync(&vi->refill);
2274
2275 if (netif_running(vi->dev)) {
2276 for (i = 0; i < vi->max_queue_pairs; i++) {
2277 napi_disable(&vi->rq[i].napi);
2278 virtnet_napi_tx_disable(&vi->sq[i].napi);
2279 }
2280 }
2281 }
2282
2283 static int init_vqs(struct virtnet_info *vi);
2284
2285 static int virtnet_restore_up(struct virtio_device *vdev)
2286 {
2287 struct virtnet_info *vi = vdev->priv;
2288 int err, i;
2289
2290 err = init_vqs(vi);
2291 if (err)
2292 return err;
2293
2294 virtio_device_ready(vdev);
2295
2296 if (netif_running(vi->dev)) {
2297 for (i = 0; i < vi->curr_queue_pairs; i++)
2298 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2299 schedule_delayed_work(&vi->refill, 0);
2300
2301 for (i = 0; i < vi->max_queue_pairs; i++) {
2302 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2303 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2304 &vi->sq[i].napi);
2305 }
2306 }
2307
2308 netif_tx_lock_bh(vi->dev);
2309 netif_device_attach(vi->dev);
2310 netif_tx_unlock_bh(vi->dev);
2311 return err;
2312 }
2313
2314 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
2315 {
2316 struct scatterlist sg;
2317 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
2318
2319 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
2320
2321 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
2322 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
2323 dev_warn(&vi->dev->dev, "Fail to set guest offload. \n");
2324 return -EINVAL;
2325 }
2326
2327 return 0;
2328 }
2329
2330 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
2331 {
2332 u64 offloads = 0;
2333
2334 if (!vi->guest_offloads)
2335 return 0;
2336
2337 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))
2338 offloads = 1ULL << VIRTIO_NET_F_GUEST_CSUM;
2339
2340 return virtnet_set_guest_offloads(vi, offloads);
2341 }
2342
2343 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
2344 {
2345 u64 offloads = vi->guest_offloads;
2346
2347 if (!vi->guest_offloads)
2348 return 0;
2349 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))
2350 offloads |= 1ULL << VIRTIO_NET_F_GUEST_CSUM;
2351
2352 return virtnet_set_guest_offloads(vi, offloads);
2353 }
2354
2355 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
2356 struct netlink_ext_ack *extack)
2357 {
2358 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
2359 struct virtnet_info *vi = netdev_priv(dev);
2360 struct bpf_prog *old_prog;
2361 u16 xdp_qp = 0, curr_qp;
2362 int i, err;
2363
2364 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
2365 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2366 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2367 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
2368 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO))) {
2369 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO, disable LRO first");
2370 return -EOPNOTSUPP;
2371 }
2372
2373 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
2374 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
2375 return -EINVAL;
2376 }
2377
2378 if (dev->mtu > max_sz) {
2379 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
2380 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
2381 return -EINVAL;
2382 }
2383
2384 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
2385 if (prog)
2386 xdp_qp = nr_cpu_ids;
2387
2388 /* XDP requires extra queues for XDP_TX */
2389 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
2390 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available");
2391 netdev_warn(dev, "request %i queues but max is %i\n",
2392 curr_qp + xdp_qp, vi->max_queue_pairs);
2393 return -ENOMEM;
2394 }
2395
2396 if (prog) {
2397 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1);
2398 if (IS_ERR(prog))
2399 return PTR_ERR(prog);
2400 }
2401
2402 /* Make sure NAPI is not using any XDP TX queues for RX. */
2403 if (netif_running(dev))
2404 for (i = 0; i < vi->max_queue_pairs; i++)
2405 napi_disable(&vi->rq[i].napi);
2406
2407 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
2408 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
2409 if (err)
2410 goto err;
2411 vi->xdp_queue_pairs = xdp_qp;
2412
2413 for (i = 0; i < vi->max_queue_pairs; i++) {
2414 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2415 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2416 if (i == 0) {
2417 if (!old_prog)
2418 virtnet_clear_guest_offloads(vi);
2419 if (!prog)
2420 virtnet_restore_guest_offloads(vi);
2421 }
2422 if (old_prog)
2423 bpf_prog_put(old_prog);
2424 if (netif_running(dev))
2425 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2426 }
2427
2428 return 0;
2429
2430 err:
2431 for (i = 0; i < vi->max_queue_pairs; i++)
2432 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2433 if (prog)
2434 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
2435 return err;
2436 }
2437
2438 static u32 virtnet_xdp_query(struct net_device *dev)
2439 {
2440 struct virtnet_info *vi = netdev_priv(dev);
2441 const struct bpf_prog *xdp_prog;
2442 int i;
2443
2444 for (i = 0; i < vi->max_queue_pairs; i++) {
2445 xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2446 if (xdp_prog)
2447 return xdp_prog->aux->id;
2448 }
2449 return 0;
2450 }
2451
2452 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
2453 {
2454 switch (xdp->command) {
2455 case XDP_SETUP_PROG:
2456 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
2457 case XDP_QUERY_PROG:
2458 xdp->prog_id = virtnet_xdp_query(dev);
2459 return 0;
2460 default:
2461 return -EINVAL;
2462 }
2463 }
2464
2465 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
2466 size_t len)
2467 {
2468 struct virtnet_info *vi = netdev_priv(dev);
2469 int ret;
2470
2471 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2472 return -EOPNOTSUPP;
2473
2474 ret = snprintf(buf, len, "sby");
2475 if (ret >= len)
2476 return -EOPNOTSUPP;
2477
2478 return 0;
2479 }
2480
2481 static const struct net_device_ops virtnet_netdev = {
2482 .ndo_open = virtnet_open,
2483 .ndo_stop = virtnet_close,
2484 .ndo_start_xmit = start_xmit,
2485 .ndo_validate_addr = eth_validate_addr,
2486 .ndo_set_mac_address = virtnet_set_mac_address,
2487 .ndo_set_rx_mode = virtnet_set_rx_mode,
2488 .ndo_get_stats64 = virtnet_stats,
2489 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
2490 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
2491 .ndo_bpf = virtnet_xdp,
2492 .ndo_xdp_xmit = virtnet_xdp_xmit,
2493 .ndo_features_check = passthru_features_check,
2494 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
2495 };
2496
2497 static void virtnet_config_changed_work(struct work_struct *work)
2498 {
2499 struct virtnet_info *vi =
2500 container_of(work, struct virtnet_info, config_work);
2501 u16 v;
2502
2503 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
2504 struct virtio_net_config, status, &v) < 0)
2505 return;
2506
2507 if (v & VIRTIO_NET_S_ANNOUNCE) {
2508 netdev_notify_peers(vi->dev);
2509 virtnet_ack_link_announce(vi);
2510 }
2511
2512 /* Ignore unknown (future) status bits */
2513 v &= VIRTIO_NET_S_LINK_UP;
2514
2515 if (vi->status == v)
2516 return;
2517
2518 vi->status = v;
2519
2520 if (vi->status & VIRTIO_NET_S_LINK_UP) {
2521 virtnet_update_settings(vi);
2522 netif_carrier_on(vi->dev);
2523 netif_tx_wake_all_queues(vi->dev);
2524 } else {
2525 netif_carrier_off(vi->dev);
2526 netif_tx_stop_all_queues(vi->dev);
2527 }
2528 }
2529
2530 static void virtnet_config_changed(struct virtio_device *vdev)
2531 {
2532 struct virtnet_info *vi = vdev->priv;
2533
2534 schedule_work(&vi->config_work);
2535 }
2536
2537 static void virtnet_free_queues(struct virtnet_info *vi)
2538 {
2539 int i;
2540
2541 for (i = 0; i < vi->max_queue_pairs; i++) {
2542 napi_hash_del(&vi->rq[i].napi);
2543 netif_napi_del(&vi->rq[i].napi);
2544 netif_napi_del(&vi->sq[i].napi);
2545 }
2546
2547 /* We called napi_hash_del() before netif_napi_del(),
2548 * we need to respect an RCU grace period before freeing vi->rq
2549 */
2550 synchronize_net();
2551
2552 kfree(vi->rq);
2553 kfree(vi->sq);
2554 kfree(vi->ctrl);
2555 }
2556
2557 static void _free_receive_bufs(struct virtnet_info *vi)
2558 {
2559 struct bpf_prog *old_prog;
2560 int i;
2561
2562 for (i = 0; i < vi->max_queue_pairs; i++) {
2563 while (vi->rq[i].pages)
2564 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
2565
2566 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2567 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
2568 if (old_prog)
2569 bpf_prog_put(old_prog);
2570 }
2571 }
2572
2573 static void free_receive_bufs(struct virtnet_info *vi)
2574 {
2575 rtnl_lock();
2576 _free_receive_bufs(vi);
2577 rtnl_unlock();
2578 }
2579
2580 static void free_receive_page_frags(struct virtnet_info *vi)
2581 {
2582 int i;
2583 for (i = 0; i < vi->max_queue_pairs; i++)
2584 if (vi->rq[i].alloc_frag.page)
2585 put_page(vi->rq[i].alloc_frag.page);
2586 }
2587
2588 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
2589 {
2590 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
2591 return false;
2592 else if (q < vi->curr_queue_pairs)
2593 return true;
2594 else
2595 return false;
2596 }
2597
2598 static void free_unused_bufs(struct virtnet_info *vi)
2599 {
2600 void *buf;
2601 int i;
2602
2603 for (i = 0; i < vi->max_queue_pairs; i++) {
2604 struct virtqueue *vq = vi->sq[i].vq;
2605 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2606 if (!is_xdp_raw_buffer_queue(vi, i))
2607 dev_kfree_skb(buf);
2608 else
2609 put_page(virt_to_head_page(buf));
2610 }
2611 }
2612
2613 for (i = 0; i < vi->max_queue_pairs; i++) {
2614 struct virtqueue *vq = vi->rq[i].vq;
2615
2616 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2617 if (vi->mergeable_rx_bufs) {
2618 put_page(virt_to_head_page(buf));
2619 } else if (vi->big_packets) {
2620 give_pages(&vi->rq[i], buf);
2621 } else {
2622 put_page(virt_to_head_page(buf));
2623 }
2624 }
2625 }
2626 }
2627
2628 static void virtnet_del_vqs(struct virtnet_info *vi)
2629 {
2630 struct virtio_device *vdev = vi->vdev;
2631
2632 virtnet_clean_affinity(vi, -1);
2633
2634 vdev->config->del_vqs(vdev);
2635
2636 virtnet_free_queues(vi);
2637 }
2638
2639 /* How large should a single buffer be so a queue full of these can fit at
2640 * least one full packet?
2641 * Logic below assumes the mergeable buffer header is used.
2642 */
2643 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
2644 {
2645 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2646 unsigned int rq_size = virtqueue_get_vring_size(vq);
2647 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
2648 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
2649 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
2650
2651 return max(max(min_buf_len, hdr_len) - hdr_len,
2652 (unsigned int)GOOD_PACKET_LEN);
2653 }
2654
2655 static int virtnet_find_vqs(struct virtnet_info *vi)
2656 {
2657 vq_callback_t **callbacks;
2658 struct virtqueue **vqs;
2659 int ret = -ENOMEM;
2660 int i, total_vqs;
2661 const char **names;
2662 bool *ctx;
2663
2664 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
2665 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
2666 * possible control vq.
2667 */
2668 total_vqs = vi->max_queue_pairs * 2 +
2669 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
2670
2671 /* Allocate space for find_vqs parameters */
2672 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
2673 if (!vqs)
2674 goto err_vq;
2675 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
2676 if (!callbacks)
2677 goto err_callback;
2678 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
2679 if (!names)
2680 goto err_names;
2681 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2682 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
2683 if (!ctx)
2684 goto err_ctx;
2685 } else {
2686 ctx = NULL;
2687 }
2688
2689 /* Parameters for control virtqueue, if any */
2690 if (vi->has_cvq) {
2691 callbacks[total_vqs - 1] = NULL;
2692 names[total_vqs - 1] = "control";
2693 }
2694
2695 /* Allocate/initialize parameters for send/receive virtqueues */
2696 for (i = 0; i < vi->max_queue_pairs; i++) {
2697 callbacks[rxq2vq(i)] = skb_recv_done;
2698 callbacks[txq2vq(i)] = skb_xmit_done;
2699 sprintf(vi->rq[i].name, "input.%d", i);
2700 sprintf(vi->sq[i].name, "output.%d", i);
2701 names[rxq2vq(i)] = vi->rq[i].name;
2702 names[txq2vq(i)] = vi->sq[i].name;
2703 if (ctx)
2704 ctx[rxq2vq(i)] = true;
2705 }
2706
2707 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
2708 names, ctx, NULL);
2709 if (ret)
2710 goto err_find;
2711
2712 if (vi->has_cvq) {
2713 vi->cvq = vqs[total_vqs - 1];
2714 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
2715 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2716 }
2717
2718 for (i = 0; i < vi->max_queue_pairs; i++) {
2719 vi->rq[i].vq = vqs[rxq2vq(i)];
2720 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
2721 vi->sq[i].vq = vqs[txq2vq(i)];
2722 }
2723
2724 /* run here: ret == 0. */
2725
2726
2727 err_find:
2728 kfree(ctx);
2729 err_ctx:
2730 kfree(names);
2731 err_names:
2732 kfree(callbacks);
2733 err_callback:
2734 kfree(vqs);
2735 err_vq:
2736 return ret;
2737 }
2738
2739 static int virtnet_alloc_queues(struct virtnet_info *vi)
2740 {
2741 int i;
2742
2743 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
2744 if (!vi->ctrl)
2745 goto err_ctrl;
2746 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
2747 if (!vi->sq)
2748 goto err_sq;
2749 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
2750 if (!vi->rq)
2751 goto err_rq;
2752
2753 INIT_DELAYED_WORK(&vi->refill, refill_work);
2754 for (i = 0; i < vi->max_queue_pairs; i++) {
2755 vi->rq[i].pages = NULL;
2756 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2757 napi_weight);
2758 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
2759 napi_tx ? napi_weight : 0);
2760
2761 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2762 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2763 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2764
2765 u64_stats_init(&vi->rq[i].stats.syncp);
2766 u64_stats_init(&vi->sq[i].stats.syncp);
2767 }
2768
2769 return 0;
2770
2771 err_rq:
2772 kfree(vi->sq);
2773 err_sq:
2774 kfree(vi->ctrl);
2775 err_ctrl:
2776 return -ENOMEM;
2777 }
2778
2779 static int init_vqs(struct virtnet_info *vi)
2780 {
2781 int ret;
2782
2783 /* Allocate send & receive queues */
2784 ret = virtnet_alloc_queues(vi);
2785 if (ret)
2786 goto err;
2787
2788 ret = virtnet_find_vqs(vi);
2789 if (ret)
2790 goto err_free;
2791
2792 get_online_cpus();
2793 virtnet_set_affinity(vi);
2794 put_online_cpus();
2795
2796 return 0;
2797
2798 err_free:
2799 virtnet_free_queues(vi);
2800 err:
2801 return ret;
2802 }
2803
2804 #ifdef CONFIG_SYSFS
2805 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2806 char *buf)
2807 {
2808 struct virtnet_info *vi = netdev_priv(queue->dev);
2809 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2810 unsigned int headroom = virtnet_get_headroom(vi);
2811 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2812 struct ewma_pkt_len *avg;
2813
2814 BUG_ON(queue_index >= vi->max_queue_pairs);
2815 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2816 return sprintf(buf, "%u\n",
2817 get_mergeable_buf_len(&vi->rq[queue_index], avg,
2818 SKB_DATA_ALIGN(headroom + tailroom)));
2819 }
2820
2821 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2822 __ATTR_RO(mergeable_rx_buffer_size);
2823
2824 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2825 &mergeable_rx_buffer_size_attribute.attr,
2826 NULL
2827 };
2828
2829 static const struct attribute_group virtio_net_mrg_rx_group = {
2830 .name = "virtio_net",
2831 .attrs = virtio_net_mrg_rx_attrs
2832 };
2833 #endif
2834
2835 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2836 unsigned int fbit,
2837 const char *fname, const char *dname)
2838 {
2839 if (!virtio_has_feature(vdev, fbit))
2840 return false;
2841
2842 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2843 fname, dname);
2844
2845 return true;
2846 }
2847
2848 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2849 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2850
2851 static bool virtnet_validate_features(struct virtio_device *vdev)
2852 {
2853 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2854 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2855 "VIRTIO_NET_F_CTRL_VQ") ||
2856 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2857 "VIRTIO_NET_F_CTRL_VQ") ||
2858 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2859 "VIRTIO_NET_F_CTRL_VQ") ||
2860 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2861 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2862 "VIRTIO_NET_F_CTRL_VQ"))) {
2863 return false;
2864 }
2865
2866 return true;
2867 }
2868
2869 #define MIN_MTU ETH_MIN_MTU
2870 #define MAX_MTU ETH_MAX_MTU
2871
2872 static int virtnet_validate(struct virtio_device *vdev)
2873 {
2874 if (!vdev->config->get) {
2875 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2876 __func__);
2877 return -EINVAL;
2878 }
2879
2880 if (!virtnet_validate_features(vdev))
2881 return -EINVAL;
2882
2883 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2884 int mtu = virtio_cread16(vdev,
2885 offsetof(struct virtio_net_config,
2886 mtu));
2887 if (mtu < MIN_MTU)
2888 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2889 }
2890
2891 return 0;
2892 }
2893
2894 static int virtnet_probe(struct virtio_device *vdev)
2895 {
2896 int i, err = -ENOMEM;
2897 struct net_device *dev;
2898 struct virtnet_info *vi;
2899 u16 max_queue_pairs;
2900 int mtu;
2901
2902 /* Find if host supports multiqueue virtio_net device */
2903 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
2904 struct virtio_net_config,
2905 max_virtqueue_pairs, &max_queue_pairs);
2906
2907 /* We need at least 2 queue's */
2908 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
2909 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
2910 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2911 max_queue_pairs = 1;
2912
2913 /* Allocate ourselves a network device with room for our info */
2914 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
2915 if (!dev)
2916 return -ENOMEM;
2917
2918 /* Set up network device as normal. */
2919 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
2920 dev->netdev_ops = &virtnet_netdev;
2921 dev->features = NETIF_F_HIGHDMA;
2922
2923 dev->ethtool_ops = &virtnet_ethtool_ops;
2924 SET_NETDEV_DEV(dev, &vdev->dev);
2925
2926 /* Do we support "hardware" checksums? */
2927 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
2928 /* This opens up the world of extra features. */
2929 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2930 if (csum)
2931 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2932
2933 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
2934 dev->hw_features |= NETIF_F_TSO
2935 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
2936 }
2937 /* Individual feature bits: what can host handle? */
2938 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
2939 dev->hw_features |= NETIF_F_TSO;
2940 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
2941 dev->hw_features |= NETIF_F_TSO6;
2942 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
2943 dev->hw_features |= NETIF_F_TSO_ECN;
2944
2945 dev->features |= NETIF_F_GSO_ROBUST;
2946
2947 if (gso)
2948 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
2949 /* (!csum && gso) case will be fixed by register_netdev() */
2950 }
2951 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
2952 dev->features |= NETIF_F_RXCSUM;
2953
2954 dev->vlan_features = dev->features;
2955
2956 /* MTU range: 68 - 65535 */
2957 dev->min_mtu = MIN_MTU;
2958 dev->max_mtu = MAX_MTU;
2959
2960 /* Configuration may specify what MAC to use. Otherwise random. */
2961 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
2962 virtio_cread_bytes(vdev,
2963 offsetof(struct virtio_net_config, mac),
2964 dev->dev_addr, dev->addr_len);
2965 else
2966 eth_hw_addr_random(dev);
2967
2968 /* Set up our device-specific information */
2969 vi = netdev_priv(dev);
2970 vi->dev = dev;
2971 vi->vdev = vdev;
2972 vdev->priv = vi;
2973
2974 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
2975
2976 /* If we can receive ANY GSO packets, we must allocate large ones. */
2977 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2978 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2979 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
2980 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
2981 vi->big_packets = true;
2982
2983 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
2984 vi->mergeable_rx_bufs = true;
2985
2986 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
2987 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2988 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2989 else
2990 vi->hdr_len = sizeof(struct virtio_net_hdr);
2991
2992 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
2993 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2994 vi->any_header_sg = true;
2995
2996 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2997 vi->has_cvq = true;
2998
2999 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3000 mtu = virtio_cread16(vdev,
3001 offsetof(struct virtio_net_config,
3002 mtu));
3003 if (mtu < dev->min_mtu) {
3004 /* Should never trigger: MTU was previously validated
3005 * in virtnet_validate.
3006 */
3007 dev_err(&vdev->dev, "device MTU appears to have changed "
3008 "it is now %d < %d", mtu, dev->min_mtu);
3009 goto free;
3010 }
3011
3012 dev->mtu = mtu;
3013 dev->max_mtu = mtu;
3014
3015 /* TODO: size buffers correctly in this case. */
3016 if (dev->mtu > ETH_DATA_LEN)
3017 vi->big_packets = true;
3018 }
3019
3020 if (vi->any_header_sg)
3021 dev->needed_headroom = vi->hdr_len;
3022
3023 /* Enable multiqueue by default */
3024 if (num_online_cpus() >= max_queue_pairs)
3025 vi->curr_queue_pairs = max_queue_pairs;
3026 else
3027 vi->curr_queue_pairs = num_online_cpus();
3028 vi->max_queue_pairs = max_queue_pairs;
3029
3030 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
3031 err = init_vqs(vi);
3032 if (err)
3033 goto free;
3034
3035 #ifdef CONFIG_SYSFS
3036 if (vi->mergeable_rx_bufs)
3037 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
3038 #endif
3039 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
3040 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
3041
3042 virtnet_init_settings(dev);
3043
3044 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3045 vi->failover = net_failover_create(vi->dev);
3046 if (IS_ERR(vi->failover)) {
3047 err = PTR_ERR(vi->failover);
3048 goto free_vqs;
3049 }
3050 }
3051
3052 err = register_netdev(dev);
3053 if (err) {
3054 pr_debug("virtio_net: registering device failed\n");
3055 goto free_failover;
3056 }
3057
3058 virtio_device_ready(vdev);
3059
3060 err = virtnet_cpu_notif_add(vi);
3061 if (err) {
3062 pr_debug("virtio_net: registering cpu notifier failed\n");
3063 goto free_unregister_netdev;
3064 }
3065
3066 virtnet_set_queues(vi, vi->curr_queue_pairs);
3067
3068 /* Assume link up if device can't report link status,
3069 otherwise get link status from config. */
3070 netif_carrier_off(dev);
3071 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3072 schedule_work(&vi->config_work);
3073 } else {
3074 vi->status = VIRTIO_NET_S_LINK_UP;
3075 virtnet_update_settings(vi);
3076 netif_carrier_on(dev);
3077 }
3078
3079 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
3080 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
3081 set_bit(guest_offloads[i], &vi->guest_offloads);
3082
3083 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
3084 dev->name, max_queue_pairs);
3085
3086 return 0;
3087
3088 free_unregister_netdev:
3089 vi->vdev->config->reset(vdev);
3090
3091 unregister_netdev(dev);
3092 free_failover:
3093 net_failover_destroy(vi->failover);
3094 free_vqs:
3095 cancel_delayed_work_sync(&vi->refill);
3096 free_receive_page_frags(vi);
3097 virtnet_del_vqs(vi);
3098 free:
3099 free_netdev(dev);
3100 return err;
3101 }
3102
3103 static void remove_vq_common(struct virtnet_info *vi)
3104 {
3105 vi->vdev->config->reset(vi->vdev);
3106
3107 /* Free unused buffers in both send and recv, if any. */
3108 free_unused_bufs(vi);
3109
3110 free_receive_bufs(vi);
3111
3112 free_receive_page_frags(vi);
3113
3114 virtnet_del_vqs(vi);
3115 }
3116
3117 static void virtnet_remove(struct virtio_device *vdev)
3118 {
3119 struct virtnet_info *vi = vdev->priv;
3120
3121 virtnet_cpu_notif_remove(vi);
3122
3123 /* Make sure no work handler is accessing the device. */
3124 flush_work(&vi->config_work);
3125
3126 unregister_netdev(vi->dev);
3127
3128 net_failover_destroy(vi->failover);
3129
3130 remove_vq_common(vi);
3131
3132 free_netdev(vi->dev);
3133 }
3134
3135 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
3136 {
3137 struct virtnet_info *vi = vdev->priv;
3138
3139 virtnet_cpu_notif_remove(vi);
3140 virtnet_freeze_down(vdev);
3141 remove_vq_common(vi);
3142
3143 return 0;
3144 }
3145
3146 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
3147 {
3148 struct virtnet_info *vi = vdev->priv;
3149 int err;
3150
3151 err = virtnet_restore_up(vdev);
3152 if (err)
3153 return err;
3154 virtnet_set_queues(vi, vi->curr_queue_pairs);
3155
3156 err = virtnet_cpu_notif_add(vi);
3157 if (err)
3158 return err;
3159
3160 return 0;
3161 }
3162
3163 static struct virtio_device_id id_table[] = {
3164 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
3165 { 0 },
3166 };
3167
3168 #define VIRTNET_FEATURES \
3169 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
3170 VIRTIO_NET_F_MAC, \
3171 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
3172 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
3173 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
3174 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
3175 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
3176 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
3177 VIRTIO_NET_F_CTRL_MAC_ADDR, \
3178 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
3179 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY
3180
3181 static unsigned int features[] = {
3182 VIRTNET_FEATURES,
3183 };
3184
3185 static unsigned int features_legacy[] = {
3186 VIRTNET_FEATURES,
3187 VIRTIO_NET_F_GSO,
3188 VIRTIO_F_ANY_LAYOUT,
3189 };
3190
3191 static struct virtio_driver virtio_net_driver = {
3192 .feature_table = features,
3193 .feature_table_size = ARRAY_SIZE(features),
3194 .feature_table_legacy = features_legacy,
3195 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
3196 .driver.name = KBUILD_MODNAME,
3197 .driver.owner = THIS_MODULE,
3198 .id_table = id_table,
3199 .validate = virtnet_validate,
3200 .probe = virtnet_probe,
3201 .remove = virtnet_remove,
3202 .config_changed = virtnet_config_changed,
3203 #ifdef CONFIG_PM_SLEEP
3204 .freeze = virtnet_freeze,
3205 .restore = virtnet_restore,
3206 #endif
3207 };
3208
3209 static __init int virtio_net_driver_init(void)
3210 {
3211 int ret;
3212
3213 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
3214 virtnet_cpu_online,
3215 virtnet_cpu_down_prep);
3216 if (ret < 0)
3217 goto out;
3218 virtionet_online = ret;
3219 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
3220 NULL, virtnet_cpu_dead);
3221 if (ret)
3222 goto err_dead;
3223
3224 ret = register_virtio_driver(&virtio_net_driver);
3225 if (ret)
3226 goto err_virtio;
3227 return 0;
3228 err_virtio:
3229 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3230 err_dead:
3231 cpuhp_remove_multi_state(virtionet_online);
3232 out:
3233 return ret;
3234 }
3235 module_init(virtio_net_driver_init);
3236
3237 static __exit void virtio_net_driver_exit(void)
3238 {
3239 unregister_virtio_driver(&virtio_net_driver);
3240 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3241 cpuhp_remove_multi_state(virtionet_online);
3242 }
3243 module_exit(virtio_net_driver_exit);
3244
3245 MODULE_DEVICE_TABLE(virtio, id_table);
3246 MODULE_DESCRIPTION("Virtio network driver");
3247 MODULE_LICENSE("GPL");
Linux with added FPC-III support