1 /* A network driver using virtio.
3 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
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.
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.
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/>.
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/netdevice.h>
34 #include <linux/pci.h>
35 #include <net/route.h>
37 #include <net/net_failover.h>
39 static int napi_weight = NAPI_POLL_WEIGHT;
40 module_param(napi_weight, int, 0444);
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);
47 /* FIXME: MTU in config. */
48 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
49 #define GOOD_COPY_LEN 128
51 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
53 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */
54 #define VIRTIO_XDP_HEADROOM 256
56 /* Separating two types of XDP xmit */
57 #define VIRTIO_XDP_TX BIT(0)
58 #define VIRTIO_XDP_REDIR BIT(1)
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.
65 DECLARE_EWMA(pkt_len, 0, 64)
67 #define VIRTNET_DRIVER_VERSION "1.0.0"
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
76 struct virtnet_stat_desc {
77 char desc[ETH_GSTRING_LEN];
81 struct virtnet_sq_stats {
82 struct u64_stats_sync syncp;
87 struct virtnet_rq_stats {
88 struct u64_stats_sync syncp;
93 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
94 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
96 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
97 { "packets", VIRTNET_SQ_STAT(packets) },
98 { "bytes", VIRTNET_SQ_STAT(bytes) },
101 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
102 { "packets", VIRTNET_RQ_STAT(packets) },
103 { "bytes", VIRTNET_RQ_STAT(bytes) },
106 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
107 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
109 /* Internal representation of a send virtqueue */
111 /* Virtqueue associated with this send _queue */
112 struct virtqueue *vq;
114 /* TX: fragments + linear part + virtio header */
115 struct scatterlist sg[MAX_SKB_FRAGS + 2];
117 /* Name of the send queue: output.$index */
120 struct virtnet_sq_stats stats;
122 struct napi_struct napi;
125 /* Internal representation of a receive virtqueue */
126 struct receive_queue {
127 /* Virtqueue associated with this receive_queue */
128 struct virtqueue *vq;
130 struct napi_struct napi;
132 struct bpf_prog __rcu *xdp_prog;
134 struct virtnet_rq_stats stats;
136 /* Chain pages by the private ptr. */
139 /* Average packet length for mergeable receive buffers. */
140 struct ewma_pkt_len mrg_avg_pkt_len;
142 /* Page frag for packet buffer allocation. */
143 struct page_frag alloc_frag;
145 /* RX: fragments + linear part + virtio header */
146 struct scatterlist sg[MAX_SKB_FRAGS + 2];
148 /* Min single buffer size for mergeable buffers case. */
149 unsigned int min_buf_len;
151 /* Name of this receive queue: input.$index */
154 struct xdp_rxq_info xdp_rxq;
157 /* Control VQ buffers: protected by the rtnl lock */
159 struct virtio_net_ctrl_hdr hdr;
160 virtio_net_ctrl_ack status;
161 struct virtio_net_ctrl_mq mq;
168 struct virtnet_info {
169 struct virtio_device *vdev;
170 struct virtqueue *cvq;
171 struct net_device *dev;
172 struct send_queue *sq;
173 struct receive_queue *rq;
176 /* Max # of queue pairs supported by the device */
179 /* # of queue pairs currently used by the driver */
180 u16 curr_queue_pairs;
182 /* # of XDP queue pairs currently used by the driver */
185 /* I like... big packets and I cannot lie! */
188 /* Host will merge rx buffers for big packets (shake it! shake it!) */
189 bool mergeable_rx_bufs;
191 /* Has control virtqueue */
194 /* Host can handle any s/g split between our header and packet data */
197 /* Packet virtio header size */
200 /* Work struct for refilling if we run low on memory. */
201 struct delayed_work refill;
203 /* Work struct for config space updates */
204 struct work_struct config_work;
206 /* Does the affinity hint is set for virtqueues? */
207 bool affinity_hint_set;
209 /* CPU hotplug instances for online & dead */
210 struct hlist_node node;
211 struct hlist_node node_dead;
213 struct control_buf *ctrl;
215 /* Ethtool settings */
219 unsigned long guest_offloads;
221 /* failover when STANDBY feature enabled */
222 struct failover *failover;
225 struct padded_vnet_hdr {
226 struct virtio_net_hdr_mrg_rxbuf hdr;
228 * hdr is in a separate sg buffer, and data sg buffer shares same page
229 * with this header sg. This padding makes next sg 16 byte aligned
235 /* Converting between virtqueue no. and kernel tx/rx queue no.
236 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
238 static int vq2txq(struct virtqueue *vq)
240 return (vq->index - 1) / 2;
243 static int txq2vq(int txq)
248 static int vq2rxq(struct virtqueue *vq)
250 return vq->index / 2;
253 static int rxq2vq(int rxq)
258 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
260 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
264 * private is used to chain pages for big packets, put the whole
265 * most recent used list in the beginning for reuse
267 static void give_pages(struct receive_queue *rq, struct page *page)
271 /* Find end of list, sew whole thing into vi->rq.pages. */
272 for (end = page; end->private; end = (struct page *)end->private);
273 end->private = (unsigned long)rq->pages;
277 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
279 struct page *p = rq->pages;
282 rq->pages = (struct page *)p->private;
283 /* clear private here, it is used to chain pages */
286 p = alloc_page(gfp_mask);
290 static void virtqueue_napi_schedule(struct napi_struct *napi,
291 struct virtqueue *vq)
293 if (napi_schedule_prep(napi)) {
294 virtqueue_disable_cb(vq);
295 __napi_schedule(napi);
299 static void virtqueue_napi_complete(struct napi_struct *napi,
300 struct virtqueue *vq, int processed)
304 opaque = virtqueue_enable_cb_prepare(vq);
305 if (napi_complete_done(napi, processed)) {
306 if (unlikely(virtqueue_poll(vq, opaque)))
307 virtqueue_napi_schedule(napi, vq);
309 virtqueue_disable_cb(vq);
313 static void skb_xmit_done(struct virtqueue *vq)
315 struct virtnet_info *vi = vq->vdev->priv;
316 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
318 /* Suppress further interrupts. */
319 virtqueue_disable_cb(vq);
322 virtqueue_napi_schedule(napi, vq);
324 /* We were probably waiting for more output buffers. */
325 netif_wake_subqueue(vi->dev, vq2txq(vq));
328 #define MRG_CTX_HEADER_SHIFT 22
329 static void *mergeable_len_to_ctx(unsigned int truesize,
330 unsigned int headroom)
332 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
335 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
337 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
340 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
342 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
345 /* Called from bottom half context */
346 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
347 struct receive_queue *rq,
348 struct page *page, unsigned int offset,
349 unsigned int len, unsigned int truesize)
352 struct virtio_net_hdr_mrg_rxbuf *hdr;
353 unsigned int copy, hdr_len, hdr_padded_len;
356 p = page_address(page) + offset;
358 /* copy small packet so we can reuse these pages for small data */
359 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
363 hdr = skb_vnet_hdr(skb);
365 hdr_len = vi->hdr_len;
366 if (vi->mergeable_rx_bufs)
367 hdr_padded_len = sizeof(*hdr);
369 hdr_padded_len = sizeof(struct padded_vnet_hdr);
371 memcpy(hdr, p, hdr_len);
374 offset += hdr_padded_len;
378 if (copy > skb_tailroom(skb))
379 copy = skb_tailroom(skb);
380 skb_put_data(skb, p, copy);
385 if (vi->mergeable_rx_bufs) {
387 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
394 * Verify that we can indeed put this data into a skb.
395 * This is here to handle cases when the device erroneously
396 * tries to receive more than is possible. This is usually
397 * the case of a broken device.
399 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
400 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
404 BUG_ON(offset >= PAGE_SIZE);
406 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
407 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
408 frag_size, truesize);
410 page = (struct page *)page->private;
415 give_pages(rq, page);
420 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
421 struct send_queue *sq,
422 struct xdp_frame *xdpf)
424 struct virtio_net_hdr_mrg_rxbuf *hdr;
427 /* virtqueue want to use data area in-front of packet */
428 if (unlikely(xdpf->metasize > 0))
431 if (unlikely(xdpf->headroom < vi->hdr_len))
434 /* Make room for virtqueue hdr (also change xdpf->headroom?) */
435 xdpf->data -= vi->hdr_len;
436 /* Zero header and leave csum up to XDP layers */
438 memset(hdr, 0, vi->hdr_len);
439 xdpf->len += vi->hdr_len;
441 sg_init_one(sq->sg, xdpf->data, xdpf->len);
443 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdpf, GFP_ATOMIC);
445 return -ENOSPC; /* Caller handle free/refcnt */
450 static int __virtnet_xdp_tx_xmit(struct virtnet_info *vi,
451 struct xdp_frame *xdpf)
453 struct xdp_frame *xdpf_sent;
454 struct send_queue *sq;
458 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
461 /* Free up any pending old buffers before queueing new ones. */
462 while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL)
463 xdp_return_frame(xdpf_sent);
465 return __virtnet_xdp_xmit_one(vi, sq, xdpf);
468 static int virtnet_xdp_xmit(struct net_device *dev,
469 int n, struct xdp_frame **frames, u32 flags)
471 struct virtnet_info *vi = netdev_priv(dev);
472 struct receive_queue *rq = vi->rq;
473 struct xdp_frame *xdpf_sent;
474 struct bpf_prog *xdp_prog;
475 struct send_queue *sq;
482 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
485 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
488 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
489 * indicate XDP resources have been successfully allocated.
491 xdp_prog = rcu_dereference(rq->xdp_prog);
495 /* Free up any pending old buffers before queueing new ones. */
496 while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL)
497 xdp_return_frame(xdpf_sent);
499 for (i = 0; i < n; i++) {
500 struct xdp_frame *xdpf = frames[i];
502 err = __virtnet_xdp_xmit_one(vi, sq, xdpf);
504 xdp_return_frame_rx_napi(xdpf);
509 if (flags & XDP_XMIT_FLUSH)
510 virtqueue_kick(sq->vq);
515 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
517 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0;
520 /* We copy the packet for XDP in the following cases:
522 * 1) Packet is scattered across multiple rx buffers.
523 * 2) Headroom space is insufficient.
525 * This is inefficient but it's a temporary condition that
526 * we hit right after XDP is enabled and until queue is refilled
527 * with large buffers with sufficient headroom - so it should affect
528 * at most queue size packets.
529 * Afterwards, the conditions to enable
530 * XDP should preclude the underlying device from sending packets
531 * across multiple buffers (num_buf > 1), and we make sure buffers
532 * have enough headroom.
534 static struct page *xdp_linearize_page(struct receive_queue *rq,
541 struct page *page = alloc_page(GFP_ATOMIC);
546 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
550 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
555 buf = virtqueue_get_buf(rq->vq, &buflen);
559 p = virt_to_head_page(buf);
560 off = buf - page_address(p);
562 /* guard against a misconfigured or uncooperative backend that
563 * is sending packet larger than the MTU.
565 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
570 memcpy(page_address(page) + page_off,
571 page_address(p) + off, buflen);
576 /* Headroom does not contribute to packet length */
577 *len = page_off - VIRTIO_XDP_HEADROOM;
580 __free_pages(page, 0);
584 static struct sk_buff *receive_small(struct net_device *dev,
585 struct virtnet_info *vi,
586 struct receive_queue *rq,
587 void *buf, void *ctx,
589 unsigned int *xdp_xmit)
592 struct bpf_prog *xdp_prog;
593 unsigned int xdp_headroom = (unsigned long)ctx;
594 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
595 unsigned int headroom = vi->hdr_len + header_offset;
596 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
597 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
598 struct page *page = virt_to_head_page(buf);
599 unsigned int delta = 0;
600 struct page *xdp_page;
606 xdp_prog = rcu_dereference(rq->xdp_prog);
608 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
609 struct xdp_frame *xdpf;
614 if (unlikely(hdr->hdr.gso_type))
617 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
618 int offset = buf - page_address(page) + header_offset;
619 unsigned int tlen = len + vi->hdr_len;
622 xdp_headroom = virtnet_get_headroom(vi);
623 header_offset = VIRTNET_RX_PAD + xdp_headroom;
624 headroom = vi->hdr_len + header_offset;
625 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
626 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
627 xdp_page = xdp_linearize_page(rq, &num_buf, page,
628 offset, header_offset,
633 buf = page_address(xdp_page);
638 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
639 xdp.data = xdp.data_hard_start + xdp_headroom;
640 xdp_set_data_meta_invalid(&xdp);
641 xdp.data_end = xdp.data + len;
642 xdp.rxq = &rq->xdp_rxq;
643 orig_data = xdp.data;
644 act = bpf_prog_run_xdp(xdp_prog, &xdp);
648 /* Recalculate length in case bpf program changed it */
649 delta = orig_data - xdp.data;
650 len = xdp.data_end - xdp.data;
653 xdpf = convert_to_xdp_frame(&xdp);
656 err = __virtnet_xdp_tx_xmit(vi, xdpf);
658 trace_xdp_exception(vi->dev, xdp_prog, act);
661 *xdp_xmit |= VIRTIO_XDP_TX;
665 err = xdp_do_redirect(dev, &xdp, xdp_prog);
668 *xdp_xmit |= VIRTIO_XDP_REDIR;
672 bpf_warn_invalid_xdp_action(act);
674 trace_xdp_exception(vi->dev, xdp_prog, act);
681 skb = build_skb(buf, buflen);
686 skb_reserve(skb, headroom - delta);
689 buf += header_offset;
690 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
691 } /* keep zeroed vnet hdr since packet was changed by bpf */
698 dev->stats.rx_dropped++;
704 static struct sk_buff *receive_big(struct net_device *dev,
705 struct virtnet_info *vi,
706 struct receive_queue *rq,
710 struct page *page = buf;
711 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
719 dev->stats.rx_dropped++;
720 give_pages(rq, page);
724 static struct sk_buff *receive_mergeable(struct net_device *dev,
725 struct virtnet_info *vi,
726 struct receive_queue *rq,
730 unsigned int *xdp_xmit)
732 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
733 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
734 struct page *page = virt_to_head_page(buf);
735 int offset = buf - page_address(page);
736 struct sk_buff *head_skb, *curr_skb;
737 struct bpf_prog *xdp_prog;
738 unsigned int truesize;
739 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
745 xdp_prog = rcu_dereference(rq->xdp_prog);
747 struct xdp_frame *xdpf;
748 struct page *xdp_page;
753 /* Transient failure which in theory could occur if
754 * in-flight packets from before XDP was enabled reach
755 * the receive path after XDP is loaded.
757 if (unlikely(hdr->hdr.gso_type))
760 /* This happens when rx buffer size is underestimated
761 * or headroom is not enough because of the buffer
762 * was refilled before XDP is set. This should only
763 * happen for the first several packets, so we don't
764 * care much about its performance.
766 if (unlikely(num_buf > 1 ||
767 headroom < virtnet_get_headroom(vi))) {
768 /* linearize data for XDP */
769 xdp_page = xdp_linearize_page(rq, &num_buf,
775 offset = VIRTIO_XDP_HEADROOM;
780 /* Allow consuming headroom but reserve enough space to push
781 * the descriptor on if we get an XDP_TX return code.
783 data = page_address(xdp_page) + offset;
784 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len;
785 xdp.data = data + vi->hdr_len;
786 xdp_set_data_meta_invalid(&xdp);
787 xdp.data_end = xdp.data + (len - vi->hdr_len);
788 xdp.rxq = &rq->xdp_rxq;
790 act = bpf_prog_run_xdp(xdp_prog, &xdp);
794 /* recalculate offset to account for any header
795 * adjustments. Note other cases do not build an
796 * skb and avoid using offset
799 page_address(xdp_page) - vi->hdr_len;
801 /* recalculate len if xdp.data or xdp.data_end were
804 len = xdp.data_end - xdp.data + vi->hdr_len;
805 /* We can only create skb based on xdp_page. */
806 if (unlikely(xdp_page != page)) {
809 head_skb = page_to_skb(vi, rq, xdp_page,
810 offset, len, PAGE_SIZE);
815 xdpf = convert_to_xdp_frame(&xdp);
818 err = __virtnet_xdp_tx_xmit(vi, xdpf);
820 trace_xdp_exception(vi->dev, xdp_prog, act);
821 if (unlikely(xdp_page != page))
825 *xdp_xmit |= VIRTIO_XDP_TX;
826 if (unlikely(xdp_page != page))
831 err = xdp_do_redirect(dev, &xdp, xdp_prog);
833 if (unlikely(xdp_page != page))
837 *xdp_xmit |= VIRTIO_XDP_REDIR;
838 if (unlikely(xdp_page != page))
843 bpf_warn_invalid_xdp_action(act);
845 trace_xdp_exception(vi->dev, xdp_prog, act);
847 if (unlikely(xdp_page != page))
848 __free_pages(xdp_page, 0);
854 truesize = mergeable_ctx_to_truesize(ctx);
855 if (unlikely(len > truesize)) {
856 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
857 dev->name, len, (unsigned long)ctx);
858 dev->stats.rx_length_errors++;
862 head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
865 if (unlikely(!curr_skb))
870 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
871 if (unlikely(!buf)) {
872 pr_debug("%s: rx error: %d buffers out of %d missing\n",
874 virtio16_to_cpu(vi->vdev,
876 dev->stats.rx_length_errors++;
880 page = virt_to_head_page(buf);
882 truesize = mergeable_ctx_to_truesize(ctx);
883 if (unlikely(len > truesize)) {
884 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
885 dev->name, len, (unsigned long)ctx);
886 dev->stats.rx_length_errors++;
890 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
891 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
892 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
896 if (curr_skb == head_skb)
897 skb_shinfo(curr_skb)->frag_list = nskb;
899 curr_skb->next = nskb;
901 head_skb->truesize += nskb->truesize;
904 if (curr_skb != head_skb) {
905 head_skb->data_len += len;
906 head_skb->len += len;
907 head_skb->truesize += truesize;
909 offset = buf - page_address(page);
910 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
912 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
915 skb_add_rx_frag(curr_skb, num_skb_frags, page,
916 offset, len, truesize);
920 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
927 while (num_buf-- > 1) {
928 buf = virtqueue_get_buf(rq->vq, &len);
929 if (unlikely(!buf)) {
930 pr_debug("%s: rx error: %d buffers missing\n",
932 dev->stats.rx_length_errors++;
935 page = virt_to_head_page(buf);
939 dev->stats.rx_dropped++;
940 dev_kfree_skb(head_skb);
945 static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
946 void *buf, unsigned int len, void **ctx,
947 unsigned int *xdp_xmit)
949 struct net_device *dev = vi->dev;
951 struct virtio_net_hdr_mrg_rxbuf *hdr;
954 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
955 pr_debug("%s: short packet %i\n", dev->name, len);
956 dev->stats.rx_length_errors++;
957 if (vi->mergeable_rx_bufs) {
958 put_page(virt_to_head_page(buf));
959 } else if (vi->big_packets) {
962 put_page(virt_to_head_page(buf));
967 if (vi->mergeable_rx_bufs)
968 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit);
969 else if (vi->big_packets)
970 skb = receive_big(dev, vi, rq, buf, len);
972 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit);
977 hdr = skb_vnet_hdr(skb);
981 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
982 skb->ip_summed = CHECKSUM_UNNECESSARY;
984 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
985 virtio_is_little_endian(vi->vdev))) {
986 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
987 dev->name, hdr->hdr.gso_type,
992 skb->protocol = eth_type_trans(skb, dev);
993 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
994 ntohs(skb->protocol), skb->len, skb->pkt_type);
996 napi_gro_receive(&rq->napi, skb);
1000 dev->stats.rx_frame_errors++;
1005 /* Unlike mergeable buffers, all buffers are allocated to the
1006 * same size, except for the headroom. For this reason we do
1007 * not need to use mergeable_len_to_ctx here - it is enough
1008 * to store the headroom as the context ignoring the truesize.
1010 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1013 struct page_frag *alloc_frag = &rq->alloc_frag;
1015 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1016 void *ctx = (void *)(unsigned long)xdp_headroom;
1017 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1020 len = SKB_DATA_ALIGN(len) +
1021 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1022 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
1025 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1026 get_page(alloc_frag->page);
1027 alloc_frag->offset += len;
1028 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,
1029 vi->hdr_len + GOOD_PACKET_LEN);
1030 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1032 put_page(virt_to_head_page(buf));
1036 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1039 struct page *first, *list = NULL;
1043 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
1045 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
1046 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
1047 first = get_a_page(rq, gfp);
1050 give_pages(rq, list);
1053 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1055 /* chain new page in list head to match sg */
1056 first->private = (unsigned long)list;
1060 first = get_a_page(rq, gfp);
1062 give_pages(rq, list);
1065 p = page_address(first);
1067 /* rq->sg[0], rq->sg[1] share the same page */
1068 /* a separated rq->sg[0] for header - required in case !any_header_sg */
1069 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1071 /* rq->sg[1] for data packet, from offset */
1072 offset = sizeof(struct padded_vnet_hdr);
1073 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1075 /* chain first in list head */
1076 first->private = (unsigned long)list;
1077 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
1080 give_pages(rq, first);
1085 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1086 struct ewma_pkt_len *avg_pkt_len,
1089 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1093 return PAGE_SIZE - room;
1095 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1096 rq->min_buf_len, PAGE_SIZE - hdr_len);
1098 return ALIGN(len, L1_CACHE_BYTES);
1101 static int add_recvbuf_mergeable(struct virtnet_info *vi,
1102 struct receive_queue *rq, gfp_t gfp)
1104 struct page_frag *alloc_frag = &rq->alloc_frag;
1105 unsigned int headroom = virtnet_get_headroom(vi);
1106 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1107 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1111 unsigned int len, hole;
1113 /* Extra tailroom is needed to satisfy XDP's assumption. This
1114 * means rx frags coalescing won't work, but consider we've
1115 * disabled GSO for XDP, it won't be a big issue.
1117 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1118 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
1121 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1122 buf += headroom; /* advance address leaving hole at front of pkt */
1123 get_page(alloc_frag->page);
1124 alloc_frag->offset += len + room;
1125 hole = alloc_frag->size - alloc_frag->offset;
1126 if (hole < len + room) {
1127 /* To avoid internal fragmentation, if there is very likely not
1128 * enough space for another buffer, add the remaining space to
1129 * the current buffer.
1132 alloc_frag->offset += hole;
1135 sg_init_one(rq->sg, buf, len);
1136 ctx = mergeable_len_to_ctx(len, headroom);
1137 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1139 put_page(virt_to_head_page(buf));
1145 * Returns false if we couldn't fill entirely (OOM).
1147 * Normally run in the receive path, but can also be run from ndo_open
1148 * before we're receiving packets, or from refill_work which is
1149 * careful to disable receiving (using napi_disable).
1151 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
1158 if (vi->mergeable_rx_bufs)
1159 err = add_recvbuf_mergeable(vi, rq, gfp);
1160 else if (vi->big_packets)
1161 err = add_recvbuf_big(vi, rq, gfp);
1163 err = add_recvbuf_small(vi, rq, gfp);
1165 oom = err == -ENOMEM;
1168 } while (rq->vq->num_free);
1169 virtqueue_kick(rq->vq);
1173 static void skb_recv_done(struct virtqueue *rvq)
1175 struct virtnet_info *vi = rvq->vdev->priv;
1176 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
1178 virtqueue_napi_schedule(&rq->napi, rvq);
1181 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
1185 /* If all buffers were filled by other side before we napi_enabled, we
1186 * won't get another interrupt, so process any outstanding packets now.
1187 * Call local_bh_enable after to trigger softIRQ processing.
1190 virtqueue_napi_schedule(napi, vq);
1194 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
1195 struct virtqueue *vq,
1196 struct napi_struct *napi)
1201 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
1202 * enable the feature if this is likely affine with the transmit path.
1204 if (!vi->affinity_hint_set) {
1209 return virtnet_napi_enable(vq, napi);
1212 static void virtnet_napi_tx_disable(struct napi_struct *napi)
1218 static void refill_work(struct work_struct *work)
1220 struct virtnet_info *vi =
1221 container_of(work, struct virtnet_info, refill.work);
1225 for (i = 0; i < vi->curr_queue_pairs; i++) {
1226 struct receive_queue *rq = &vi->rq[i];
1228 napi_disable(&rq->napi);
1229 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
1230 virtnet_napi_enable(rq->vq, &rq->napi);
1232 /* In theory, this can happen: if we don't get any buffers in
1233 * we will *never* try to fill again.
1236 schedule_delayed_work(&vi->refill, HZ/2);
1240 static int virtnet_receive(struct receive_queue *rq, int budget,
1241 unsigned int *xdp_xmit)
1243 struct virtnet_info *vi = rq->vq->vdev->priv;
1244 unsigned int len, received = 0, bytes = 0;
1247 if (!vi->big_packets || vi->mergeable_rx_bufs) {
1250 while (received < budget &&
1251 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
1252 bytes += receive_buf(vi, rq, buf, len, ctx, xdp_xmit);
1256 while (received < budget &&
1257 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
1258 bytes += receive_buf(vi, rq, buf, len, NULL, xdp_xmit);
1263 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
1264 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
1265 schedule_delayed_work(&vi->refill, 0);
1268 u64_stats_update_begin(&rq->stats.syncp);
1269 rq->stats.bytes += bytes;
1270 rq->stats.packets += received;
1271 u64_stats_update_end(&rq->stats.syncp);
1276 static void free_old_xmit_skbs(struct send_queue *sq)
1278 struct sk_buff *skb;
1280 unsigned int packets = 0;
1281 unsigned int bytes = 0;
1283 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1284 pr_debug("Sent skb %p\n", skb);
1289 dev_consume_skb_any(skb);
1292 /* Avoid overhead when no packets have been processed
1293 * happens when called speculatively from start_xmit.
1298 u64_stats_update_begin(&sq->stats.syncp);
1299 sq->stats.bytes += bytes;
1300 sq->stats.packets += packets;
1301 u64_stats_update_end(&sq->stats.syncp);
1304 static void virtnet_poll_cleantx(struct receive_queue *rq)
1306 struct virtnet_info *vi = rq->vq->vdev->priv;
1307 unsigned int index = vq2rxq(rq->vq);
1308 struct send_queue *sq = &vi->sq[index];
1309 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
1311 if (!sq->napi.weight)
1314 if (__netif_tx_trylock(txq)) {
1315 free_old_xmit_skbs(sq);
1316 __netif_tx_unlock(txq);
1319 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1320 netif_tx_wake_queue(txq);
1323 static int virtnet_poll(struct napi_struct *napi, int budget)
1325 struct receive_queue *rq =
1326 container_of(napi, struct receive_queue, napi);
1327 struct virtnet_info *vi = rq->vq->vdev->priv;
1328 struct send_queue *sq;
1329 unsigned int received, qp;
1330 unsigned int xdp_xmit = 0;
1332 virtnet_poll_cleantx(rq);
1334 received = virtnet_receive(rq, budget, &xdp_xmit);
1336 /* Out of packets? */
1337 if (received < budget)
1338 virtqueue_napi_complete(napi, rq->vq, received);
1340 if (xdp_xmit & VIRTIO_XDP_REDIR)
1343 if (xdp_xmit & VIRTIO_XDP_TX) {
1344 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs +
1347 virtqueue_kick(sq->vq);
1353 static int virtnet_open(struct net_device *dev)
1355 struct virtnet_info *vi = netdev_priv(dev);
1358 for (i = 0; i < vi->max_queue_pairs; i++) {
1359 if (i < vi->curr_queue_pairs)
1360 /* Make sure we have some buffers: if oom use wq. */
1361 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1362 schedule_delayed_work(&vi->refill, 0);
1364 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i);
1368 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
1369 MEM_TYPE_PAGE_SHARED, NULL);
1371 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1375 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
1376 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
1382 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
1384 struct send_queue *sq = container_of(napi, struct send_queue, napi);
1385 struct virtnet_info *vi = sq->vq->vdev->priv;
1386 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq));
1388 __netif_tx_lock(txq, raw_smp_processor_id());
1389 free_old_xmit_skbs(sq);
1390 __netif_tx_unlock(txq);
1392 virtqueue_napi_complete(napi, sq->vq, 0);
1394 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1395 netif_tx_wake_queue(txq);
1400 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1402 struct virtio_net_hdr_mrg_rxbuf *hdr;
1403 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1404 struct virtnet_info *vi = sq->vq->vdev->priv;
1406 unsigned hdr_len = vi->hdr_len;
1409 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1411 can_push = vi->any_header_sg &&
1412 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1413 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1414 /* Even if we can, don't push here yet as this would skew
1415 * csum_start offset below. */
1417 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1419 hdr = skb_vnet_hdr(skb);
1421 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1422 virtio_is_little_endian(vi->vdev), false,
1426 if (vi->mergeable_rx_bufs)
1427 hdr->num_buffers = 0;
1429 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1431 __skb_push(skb, hdr_len);
1432 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1433 if (unlikely(num_sg < 0))
1435 /* Pull header back to avoid skew in tx bytes calculations. */
1436 __skb_pull(skb, hdr_len);
1438 sg_set_buf(sq->sg, hdr, hdr_len);
1439 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
1440 if (unlikely(num_sg < 0))
1444 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1447 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1449 struct virtnet_info *vi = netdev_priv(dev);
1450 int qnum = skb_get_queue_mapping(skb);
1451 struct send_queue *sq = &vi->sq[qnum];
1453 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1454 bool kick = !skb->xmit_more;
1455 bool use_napi = sq->napi.weight;
1457 /* Free up any pending old buffers before queueing new ones. */
1458 free_old_xmit_skbs(sq);
1460 if (use_napi && kick)
1461 virtqueue_enable_cb_delayed(sq->vq);
1463 /* timestamp packet in software */
1464 skb_tx_timestamp(skb);
1466 /* Try to transmit */
1467 err = xmit_skb(sq, skb);
1469 /* This should not happen! */
1470 if (unlikely(err)) {
1471 dev->stats.tx_fifo_errors++;
1472 if (net_ratelimit())
1474 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
1475 dev->stats.tx_dropped++;
1476 dev_kfree_skb_any(skb);
1477 return NETDEV_TX_OK;
1480 /* Don't wait up for transmitted skbs to be freed. */
1486 /* If running out of space, stop queue to avoid getting packets that we
1487 * are then unable to transmit.
1488 * An alternative would be to force queuing layer to requeue the skb by
1489 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1490 * returned in a normal path of operation: it means that driver is not
1491 * maintaining the TX queue stop/start state properly, and causes
1492 * the stack to do a non-trivial amount of useless work.
1493 * Since most packets only take 1 or 2 ring slots, stopping the queue
1494 * early means 16 slots are typically wasted.
1496 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1497 netif_stop_subqueue(dev, qnum);
1499 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1500 /* More just got used, free them then recheck. */
1501 free_old_xmit_skbs(sq);
1502 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1503 netif_start_subqueue(dev, qnum);
1504 virtqueue_disable_cb(sq->vq);
1509 if (kick || netif_xmit_stopped(txq))
1510 virtqueue_kick(sq->vq);
1512 return NETDEV_TX_OK;
1516 * Send command via the control virtqueue and check status. Commands
1517 * supported by the hypervisor, as indicated by feature bits, should
1518 * never fail unless improperly formatted.
1520 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1521 struct scatterlist *out)
1523 struct scatterlist *sgs[4], hdr, stat;
1524 unsigned out_num = 0, tmp;
1526 /* Caller should know better */
1527 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1529 vi->ctrl->status = ~0;
1530 vi->ctrl->hdr.class = class;
1531 vi->ctrl->hdr.cmd = cmd;
1533 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
1534 sgs[out_num++] = &hdr;
1537 sgs[out_num++] = out;
1539 /* Add return status. */
1540 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
1541 sgs[out_num] = &stat;
1543 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1544 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1546 if (unlikely(!virtqueue_kick(vi->cvq)))
1547 return vi->ctrl->status == VIRTIO_NET_OK;
1549 /* Spin for a response, the kick causes an ioport write, trapping
1550 * into the hypervisor, so the request should be handled immediately.
1552 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1553 !virtqueue_is_broken(vi->cvq))
1556 return vi->ctrl->status == VIRTIO_NET_OK;
1559 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1561 struct virtnet_info *vi = netdev_priv(dev);
1562 struct virtio_device *vdev = vi->vdev;
1564 struct sockaddr *addr;
1565 struct scatterlist sg;
1567 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
1570 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
1574 ret = eth_prepare_mac_addr_change(dev, addr);
1578 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1579 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1580 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1581 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1582 dev_warn(&vdev->dev,
1583 "Failed to set mac address by vq command.\n");
1587 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1588 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1591 /* Naturally, this has an atomicity problem. */
1592 for (i = 0; i < dev->addr_len; i++)
1593 virtio_cwrite8(vdev,
1594 offsetof(struct virtio_net_config, mac) +
1595 i, addr->sa_data[i]);
1598 eth_commit_mac_addr_change(dev, p);
1606 static void virtnet_stats(struct net_device *dev,
1607 struct rtnl_link_stats64 *tot)
1609 struct virtnet_info *vi = netdev_priv(dev);
1613 for (i = 0; i < vi->max_queue_pairs; i++) {
1614 u64 tpackets, tbytes, rpackets, rbytes;
1615 struct receive_queue *rq = &vi->rq[i];
1616 struct send_queue *sq = &vi->sq[i];
1619 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
1620 tpackets = sq->stats.packets;
1621 tbytes = sq->stats.bytes;
1622 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
1625 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
1626 rpackets = rq->stats.packets;
1627 rbytes = rq->stats.bytes;
1628 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
1630 tot->rx_packets += rpackets;
1631 tot->tx_packets += tpackets;
1632 tot->rx_bytes += rbytes;
1633 tot->tx_bytes += tbytes;
1636 tot->tx_dropped = dev->stats.tx_dropped;
1637 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1638 tot->rx_dropped = dev->stats.rx_dropped;
1639 tot->rx_length_errors = dev->stats.rx_length_errors;
1640 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1643 #ifdef CONFIG_NET_POLL_CONTROLLER
1644 static void virtnet_netpoll(struct net_device *dev)
1646 struct virtnet_info *vi = netdev_priv(dev);
1649 for (i = 0; i < vi->curr_queue_pairs; i++)
1650 napi_schedule(&vi->rq[i].napi);
1654 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1657 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1658 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1659 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1663 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1665 struct scatterlist sg;
1666 struct net_device *dev = vi->dev;
1668 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1671 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1672 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
1674 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1675 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1676 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1680 vi->curr_queue_pairs = queue_pairs;
1681 /* virtnet_open() will refill when device is going to up. */
1682 if (dev->flags & IFF_UP)
1683 schedule_delayed_work(&vi->refill, 0);
1689 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1694 err = _virtnet_set_queues(vi, queue_pairs);
1699 static int virtnet_close(struct net_device *dev)
1701 struct virtnet_info *vi = netdev_priv(dev);
1704 /* Make sure refill_work doesn't re-enable napi! */
1705 cancel_delayed_work_sync(&vi->refill);
1707 for (i = 0; i < vi->max_queue_pairs; i++) {
1708 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1709 napi_disable(&vi->rq[i].napi);
1710 virtnet_napi_tx_disable(&vi->sq[i].napi);
1716 static void virtnet_set_rx_mode(struct net_device *dev)
1718 struct virtnet_info *vi = netdev_priv(dev);
1719 struct scatterlist sg[2];
1720 struct virtio_net_ctrl_mac *mac_data;
1721 struct netdev_hw_addr *ha;
1727 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1728 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1731 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
1732 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1734 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
1736 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1737 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1738 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1739 vi->ctrl->promisc ? "en" : "dis");
1741 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
1743 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1744 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1745 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1746 vi->ctrl->allmulti ? "en" : "dis");
1748 uc_count = netdev_uc_count(dev);
1749 mc_count = netdev_mc_count(dev);
1750 /* MAC filter - use one buffer for both lists */
1751 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1752 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1757 sg_init_table(sg, 2);
1759 /* Store the unicast list and count in the front of the buffer */
1760 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1762 netdev_for_each_uc_addr(ha, dev)
1763 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1765 sg_set_buf(&sg[0], mac_data,
1766 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1768 /* multicast list and count fill the end */
1769 mac_data = (void *)&mac_data->macs[uc_count][0];
1771 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1773 netdev_for_each_mc_addr(ha, dev)
1774 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1776 sg_set_buf(&sg[1], mac_data,
1777 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1779 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1780 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1781 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1786 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1787 __be16 proto, u16 vid)
1789 struct virtnet_info *vi = netdev_priv(dev);
1790 struct scatterlist sg;
1792 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1793 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1795 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1796 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1797 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1801 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1802 __be16 proto, u16 vid)
1804 struct virtnet_info *vi = netdev_priv(dev);
1805 struct scatterlist sg;
1807 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1808 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1810 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1811 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1812 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1816 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1820 if (vi->affinity_hint_set) {
1821 for (i = 0; i < vi->max_queue_pairs; i++) {
1822 virtqueue_set_affinity(vi->rq[i].vq, -1);
1823 virtqueue_set_affinity(vi->sq[i].vq, -1);
1826 vi->affinity_hint_set = false;
1830 static void virtnet_set_affinity(struct virtnet_info *vi)
1835 /* In multiqueue mode, when the number of cpu is equal to the number of
1836 * queue pairs, we let the queue pairs to be private to one cpu by
1837 * setting the affinity hint to eliminate the contention.
1839 if (vi->curr_queue_pairs == 1 ||
1840 vi->max_queue_pairs != num_online_cpus()) {
1841 virtnet_clean_affinity(vi, -1);
1846 for_each_online_cpu(cpu) {
1847 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1848 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1849 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1853 vi->affinity_hint_set = true;
1856 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
1858 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1860 virtnet_set_affinity(vi);
1864 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
1866 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1868 virtnet_set_affinity(vi);
1872 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
1874 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1877 virtnet_clean_affinity(vi, cpu);
1881 static enum cpuhp_state virtionet_online;
1883 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
1887 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
1890 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1894 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1898 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
1900 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1901 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1905 static void virtnet_get_ringparam(struct net_device *dev,
1906 struct ethtool_ringparam *ring)
1908 struct virtnet_info *vi = netdev_priv(dev);
1910 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1911 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1912 ring->rx_pending = ring->rx_max_pending;
1913 ring->tx_pending = ring->tx_max_pending;
1917 static void virtnet_get_drvinfo(struct net_device *dev,
1918 struct ethtool_drvinfo *info)
1920 struct virtnet_info *vi = netdev_priv(dev);
1921 struct virtio_device *vdev = vi->vdev;
1923 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1924 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1925 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1929 /* TODO: Eliminate OOO packets during switching */
1930 static int virtnet_set_channels(struct net_device *dev,
1931 struct ethtool_channels *channels)
1933 struct virtnet_info *vi = netdev_priv(dev);
1934 u16 queue_pairs = channels->combined_count;
1937 /* We don't support separate rx/tx channels.
1938 * We don't allow setting 'other' channels.
1940 if (channels->rx_count || channels->tx_count || channels->other_count)
1943 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1946 /* For now we don't support modifying channels while XDP is loaded
1947 * also when XDP is loaded all RX queues have XDP programs so we only
1948 * need to check a single RX queue.
1950 if (vi->rq[0].xdp_prog)
1954 err = _virtnet_set_queues(vi, queue_pairs);
1956 netif_set_real_num_tx_queues(dev, queue_pairs);
1957 netif_set_real_num_rx_queues(dev, queue_pairs);
1959 virtnet_set_affinity(vi);
1966 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1968 struct virtnet_info *vi = netdev_priv(dev);
1969 char *p = (char *)data;
1972 switch (stringset) {
1974 for (i = 0; i < vi->curr_queue_pairs; i++) {
1975 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
1976 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s",
1977 i, virtnet_rq_stats_desc[j].desc);
1978 p += ETH_GSTRING_LEN;
1982 for (i = 0; i < vi->curr_queue_pairs; i++) {
1983 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
1984 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s",
1985 i, virtnet_sq_stats_desc[j].desc);
1986 p += ETH_GSTRING_LEN;
1993 static int virtnet_get_sset_count(struct net_device *dev, int sset)
1995 struct virtnet_info *vi = netdev_priv(dev);
1999 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
2000 VIRTNET_SQ_STATS_LEN);
2006 static void virtnet_get_ethtool_stats(struct net_device *dev,
2007 struct ethtool_stats *stats, u64 *data)
2009 struct virtnet_info *vi = netdev_priv(dev);
2010 unsigned int idx = 0, start, i, j;
2011 const u8 *stats_base;
2014 for (i = 0; i < vi->curr_queue_pairs; i++) {
2015 struct receive_queue *rq = &vi->rq[i];
2017 stats_base = (u8 *)&rq->stats;
2019 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
2020 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2021 offset = virtnet_rq_stats_desc[j].offset;
2022 data[idx + j] = *(u64 *)(stats_base + offset);
2024 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
2025 idx += VIRTNET_RQ_STATS_LEN;
2028 for (i = 0; i < vi->curr_queue_pairs; i++) {
2029 struct send_queue *sq = &vi->sq[i];
2031 stats_base = (u8 *)&sq->stats;
2033 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
2034 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2035 offset = virtnet_sq_stats_desc[j].offset;
2036 data[idx + j] = *(u64 *)(stats_base + offset);
2038 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
2039 idx += VIRTNET_SQ_STATS_LEN;
2043 static void virtnet_get_channels(struct net_device *dev,
2044 struct ethtool_channels *channels)
2046 struct virtnet_info *vi = netdev_priv(dev);
2048 channels->combined_count = vi->curr_queue_pairs;
2049 channels->max_combined = vi->max_queue_pairs;
2050 channels->max_other = 0;
2051 channels->rx_count = 0;
2052 channels->tx_count = 0;
2053 channels->other_count = 0;
2056 /* Check if the user is trying to change anything besides speed/duplex */
2058 virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd)
2060 struct ethtool_link_ksettings diff1 = *cmd;
2061 struct ethtool_link_ksettings diff2 = {};
2063 /* cmd is always set so we need to clear it, validate the port type
2064 * and also without autonegotiation we can ignore advertising
2066 diff1.base.speed = 0;
2067 diff2.base.port = PORT_OTHER;
2068 ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
2069 diff1.base.duplex = 0;
2071 diff1.base.link_mode_masks_nwords = 0;
2073 return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) &&
2074 bitmap_empty(diff1.link_modes.supported,
2075 __ETHTOOL_LINK_MODE_MASK_NBITS) &&
2076 bitmap_empty(diff1.link_modes.advertising,
2077 __ETHTOOL_LINK_MODE_MASK_NBITS) &&
2078 bitmap_empty(diff1.link_modes.lp_advertising,
2079 __ETHTOOL_LINK_MODE_MASK_NBITS);
2082 static int virtnet_set_link_ksettings(struct net_device *dev,
2083 const struct ethtool_link_ksettings *cmd)
2085 struct virtnet_info *vi = netdev_priv(dev);
2088 speed = cmd->base.speed;
2089 /* don't allow custom speed and duplex */
2090 if (!ethtool_validate_speed(speed) ||
2091 !ethtool_validate_duplex(cmd->base.duplex) ||
2092 !virtnet_validate_ethtool_cmd(cmd))
2095 vi->duplex = cmd->base.duplex;
2100 static int virtnet_get_link_ksettings(struct net_device *dev,
2101 struct ethtool_link_ksettings *cmd)
2103 struct virtnet_info *vi = netdev_priv(dev);
2105 cmd->base.speed = vi->speed;
2106 cmd->base.duplex = vi->duplex;
2107 cmd->base.port = PORT_OTHER;
2112 static void virtnet_init_settings(struct net_device *dev)
2114 struct virtnet_info *vi = netdev_priv(dev);
2116 vi->speed = SPEED_UNKNOWN;
2117 vi->duplex = DUPLEX_UNKNOWN;
2120 static void virtnet_update_settings(struct virtnet_info *vi)
2125 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
2128 speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config,
2130 if (ethtool_validate_speed(speed))
2132 duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config,
2134 if (ethtool_validate_duplex(duplex))
2135 vi->duplex = duplex;
2138 static const struct ethtool_ops virtnet_ethtool_ops = {
2139 .get_drvinfo = virtnet_get_drvinfo,
2140 .get_link = ethtool_op_get_link,
2141 .get_ringparam = virtnet_get_ringparam,
2142 .get_strings = virtnet_get_strings,
2143 .get_sset_count = virtnet_get_sset_count,
2144 .get_ethtool_stats = virtnet_get_ethtool_stats,
2145 .set_channels = virtnet_set_channels,
2146 .get_channels = virtnet_get_channels,
2147 .get_ts_info = ethtool_op_get_ts_info,
2148 .get_link_ksettings = virtnet_get_link_ksettings,
2149 .set_link_ksettings = virtnet_set_link_ksettings,
2152 static void virtnet_freeze_down(struct virtio_device *vdev)
2154 struct virtnet_info *vi = vdev->priv;
2157 /* Make sure no work handler is accessing the device */
2158 flush_work(&vi->config_work);
2160 netif_device_detach(vi->dev);
2161 netif_tx_disable(vi->dev);
2162 cancel_delayed_work_sync(&vi->refill);
2164 if (netif_running(vi->dev)) {
2165 for (i = 0; i < vi->max_queue_pairs; i++) {
2166 napi_disable(&vi->rq[i].napi);
2167 virtnet_napi_tx_disable(&vi->sq[i].napi);
2172 static int init_vqs(struct virtnet_info *vi);
2174 static int virtnet_restore_up(struct virtio_device *vdev)
2176 struct virtnet_info *vi = vdev->priv;
2183 virtio_device_ready(vdev);
2185 if (netif_running(vi->dev)) {
2186 for (i = 0; i < vi->curr_queue_pairs; i++)
2187 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2188 schedule_delayed_work(&vi->refill, 0);
2190 for (i = 0; i < vi->max_queue_pairs; i++) {
2191 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2192 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2197 netif_device_attach(vi->dev);
2201 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
2203 struct scatterlist sg;
2204 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
2206 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
2208 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
2209 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
2210 dev_warn(&vi->dev->dev, "Fail to set guest offload. \n");
2217 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
2221 if (!vi->guest_offloads)
2224 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))
2225 offloads = 1ULL << VIRTIO_NET_F_GUEST_CSUM;
2227 return virtnet_set_guest_offloads(vi, offloads);
2230 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
2232 u64 offloads = vi->guest_offloads;
2234 if (!vi->guest_offloads)
2236 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))
2237 offloads |= 1ULL << VIRTIO_NET_F_GUEST_CSUM;
2239 return virtnet_set_guest_offloads(vi, offloads);
2242 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
2243 struct netlink_ext_ack *extack)
2245 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
2246 struct virtnet_info *vi = netdev_priv(dev);
2247 struct bpf_prog *old_prog;
2248 u16 xdp_qp = 0, curr_qp;
2251 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
2252 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2253 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2254 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
2255 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO))) {
2256 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO, disable LRO first");
2260 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
2261 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
2265 if (dev->mtu > max_sz) {
2266 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
2267 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
2271 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
2273 xdp_qp = nr_cpu_ids;
2275 /* XDP requires extra queues for XDP_TX */
2276 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
2277 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available");
2278 netdev_warn(dev, "request %i queues but max is %i\n",
2279 curr_qp + xdp_qp, vi->max_queue_pairs);
2284 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1);
2286 return PTR_ERR(prog);
2289 /* Make sure NAPI is not using any XDP TX queues for RX. */
2290 if (netif_running(dev))
2291 for (i = 0; i < vi->max_queue_pairs; i++)
2292 napi_disable(&vi->rq[i].napi);
2294 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
2295 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
2298 vi->xdp_queue_pairs = xdp_qp;
2300 for (i = 0; i < vi->max_queue_pairs; i++) {
2301 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2302 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2305 virtnet_clear_guest_offloads(vi);
2307 virtnet_restore_guest_offloads(vi);
2310 bpf_prog_put(old_prog);
2311 if (netif_running(dev))
2312 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2318 for (i = 0; i < vi->max_queue_pairs; i++)
2319 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2321 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
2325 static u32 virtnet_xdp_query(struct net_device *dev)
2327 struct virtnet_info *vi = netdev_priv(dev);
2328 const struct bpf_prog *xdp_prog;
2331 for (i = 0; i < vi->max_queue_pairs; i++) {
2332 xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2334 return xdp_prog->aux->id;
2339 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
2341 switch (xdp->command) {
2342 case XDP_SETUP_PROG:
2343 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
2344 case XDP_QUERY_PROG:
2345 xdp->prog_id = virtnet_xdp_query(dev);
2346 xdp->prog_attached = !!xdp->prog_id;
2353 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
2356 struct virtnet_info *vi = netdev_priv(dev);
2359 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2362 ret = snprintf(buf, len, "sby");
2369 static const struct net_device_ops virtnet_netdev = {
2370 .ndo_open = virtnet_open,
2371 .ndo_stop = virtnet_close,
2372 .ndo_start_xmit = start_xmit,
2373 .ndo_validate_addr = eth_validate_addr,
2374 .ndo_set_mac_address = virtnet_set_mac_address,
2375 .ndo_set_rx_mode = virtnet_set_rx_mode,
2376 .ndo_get_stats64 = virtnet_stats,
2377 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
2378 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
2379 #ifdef CONFIG_NET_POLL_CONTROLLER
2380 .ndo_poll_controller = virtnet_netpoll,
2382 .ndo_bpf = virtnet_xdp,
2383 .ndo_xdp_xmit = virtnet_xdp_xmit,
2384 .ndo_features_check = passthru_features_check,
2385 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
2388 static void virtnet_config_changed_work(struct work_struct *work)
2390 struct virtnet_info *vi =
2391 container_of(work, struct virtnet_info, config_work);
2394 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
2395 struct virtio_net_config, status, &v) < 0)
2398 if (v & VIRTIO_NET_S_ANNOUNCE) {
2399 netdev_notify_peers(vi->dev);
2400 virtnet_ack_link_announce(vi);
2403 /* Ignore unknown (future) status bits */
2404 v &= VIRTIO_NET_S_LINK_UP;
2406 if (vi->status == v)
2411 if (vi->status & VIRTIO_NET_S_LINK_UP) {
2412 virtnet_update_settings(vi);
2413 netif_carrier_on(vi->dev);
2414 netif_tx_wake_all_queues(vi->dev);
2416 netif_carrier_off(vi->dev);
2417 netif_tx_stop_all_queues(vi->dev);
2421 static void virtnet_config_changed(struct virtio_device *vdev)
2423 struct virtnet_info *vi = vdev->priv;
2425 schedule_work(&vi->config_work);
2428 static void virtnet_free_queues(struct virtnet_info *vi)
2432 for (i = 0; i < vi->max_queue_pairs; i++) {
2433 napi_hash_del(&vi->rq[i].napi);
2434 netif_napi_del(&vi->rq[i].napi);
2435 netif_napi_del(&vi->sq[i].napi);
2438 /* We called napi_hash_del() before netif_napi_del(),
2439 * we need to respect an RCU grace period before freeing vi->rq
2448 static void _free_receive_bufs(struct virtnet_info *vi)
2450 struct bpf_prog *old_prog;
2453 for (i = 0; i < vi->max_queue_pairs; i++) {
2454 while (vi->rq[i].pages)
2455 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
2457 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2458 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
2460 bpf_prog_put(old_prog);
2464 static void free_receive_bufs(struct virtnet_info *vi)
2467 _free_receive_bufs(vi);
2471 static void free_receive_page_frags(struct virtnet_info *vi)
2474 for (i = 0; i < vi->max_queue_pairs; i++)
2475 if (vi->rq[i].alloc_frag.page)
2476 put_page(vi->rq[i].alloc_frag.page);
2479 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
2481 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
2483 else if (q < vi->curr_queue_pairs)
2489 static void free_unused_bufs(struct virtnet_info *vi)
2494 for (i = 0; i < vi->max_queue_pairs; i++) {
2495 struct virtqueue *vq = vi->sq[i].vq;
2496 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2497 if (!is_xdp_raw_buffer_queue(vi, i))
2500 put_page(virt_to_head_page(buf));
2504 for (i = 0; i < vi->max_queue_pairs; i++) {
2505 struct virtqueue *vq = vi->rq[i].vq;
2507 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2508 if (vi->mergeable_rx_bufs) {
2509 put_page(virt_to_head_page(buf));
2510 } else if (vi->big_packets) {
2511 give_pages(&vi->rq[i], buf);
2513 put_page(virt_to_head_page(buf));
2519 static void virtnet_del_vqs(struct virtnet_info *vi)
2521 struct virtio_device *vdev = vi->vdev;
2523 virtnet_clean_affinity(vi, -1);
2525 vdev->config->del_vqs(vdev);
2527 virtnet_free_queues(vi);
2530 /* How large should a single buffer be so a queue full of these can fit at
2531 * least one full packet?
2532 * Logic below assumes the mergeable buffer header is used.
2534 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
2536 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2537 unsigned int rq_size = virtqueue_get_vring_size(vq);
2538 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
2539 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
2540 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
2542 return max(max(min_buf_len, hdr_len) - hdr_len,
2543 (unsigned int)GOOD_PACKET_LEN);
2546 static int virtnet_find_vqs(struct virtnet_info *vi)
2548 vq_callback_t **callbacks;
2549 struct virtqueue **vqs;
2555 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
2556 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
2557 * possible control vq.
2559 total_vqs = vi->max_queue_pairs * 2 +
2560 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
2562 /* Allocate space for find_vqs parameters */
2563 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
2566 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
2569 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
2572 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2573 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
2580 /* Parameters for control virtqueue, if any */
2582 callbacks[total_vqs - 1] = NULL;
2583 names[total_vqs - 1] = "control";
2586 /* Allocate/initialize parameters for send/receive virtqueues */
2587 for (i = 0; i < vi->max_queue_pairs; i++) {
2588 callbacks[rxq2vq(i)] = skb_recv_done;
2589 callbacks[txq2vq(i)] = skb_xmit_done;
2590 sprintf(vi->rq[i].name, "input.%d", i);
2591 sprintf(vi->sq[i].name, "output.%d", i);
2592 names[rxq2vq(i)] = vi->rq[i].name;
2593 names[txq2vq(i)] = vi->sq[i].name;
2595 ctx[rxq2vq(i)] = true;
2598 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
2604 vi->cvq = vqs[total_vqs - 1];
2605 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
2606 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2609 for (i = 0; i < vi->max_queue_pairs; i++) {
2610 vi->rq[i].vq = vqs[rxq2vq(i)];
2611 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
2612 vi->sq[i].vq = vqs[txq2vq(i)];
2615 /* run here: ret == 0. */
2630 static int virtnet_alloc_queues(struct virtnet_info *vi)
2634 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
2637 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
2640 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
2644 INIT_DELAYED_WORK(&vi->refill, refill_work);
2645 for (i = 0; i < vi->max_queue_pairs; i++) {
2646 vi->rq[i].pages = NULL;
2647 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2649 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
2650 napi_tx ? napi_weight : 0);
2652 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2653 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2654 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2656 u64_stats_init(&vi->rq[i].stats.syncp);
2657 u64_stats_init(&vi->sq[i].stats.syncp);
2670 static int init_vqs(struct virtnet_info *vi)
2674 /* Allocate send & receive queues */
2675 ret = virtnet_alloc_queues(vi);
2679 ret = virtnet_find_vqs(vi);
2684 virtnet_set_affinity(vi);
2690 virtnet_free_queues(vi);
2696 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2699 struct virtnet_info *vi = netdev_priv(queue->dev);
2700 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2701 unsigned int headroom = virtnet_get_headroom(vi);
2702 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2703 struct ewma_pkt_len *avg;
2705 BUG_ON(queue_index >= vi->max_queue_pairs);
2706 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2707 return sprintf(buf, "%u\n",
2708 get_mergeable_buf_len(&vi->rq[queue_index], avg,
2709 SKB_DATA_ALIGN(headroom + tailroom)));
2712 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2713 __ATTR_RO(mergeable_rx_buffer_size);
2715 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2716 &mergeable_rx_buffer_size_attribute.attr,
2720 static const struct attribute_group virtio_net_mrg_rx_group = {
2721 .name = "virtio_net",
2722 .attrs = virtio_net_mrg_rx_attrs
2726 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2728 const char *fname, const char *dname)
2730 if (!virtio_has_feature(vdev, fbit))
2733 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2739 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2740 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2742 static bool virtnet_validate_features(struct virtio_device *vdev)
2744 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2745 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2746 "VIRTIO_NET_F_CTRL_VQ") ||
2747 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2748 "VIRTIO_NET_F_CTRL_VQ") ||
2749 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2750 "VIRTIO_NET_F_CTRL_VQ") ||
2751 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2752 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2753 "VIRTIO_NET_F_CTRL_VQ"))) {
2760 #define MIN_MTU ETH_MIN_MTU
2761 #define MAX_MTU ETH_MAX_MTU
2763 static int virtnet_validate(struct virtio_device *vdev)
2765 if (!vdev->config->get) {
2766 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2771 if (!virtnet_validate_features(vdev))
2774 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2775 int mtu = virtio_cread16(vdev,
2776 offsetof(struct virtio_net_config,
2779 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2785 static int virtnet_probe(struct virtio_device *vdev)
2787 int i, err = -ENOMEM;
2788 struct net_device *dev;
2789 struct virtnet_info *vi;
2790 u16 max_queue_pairs;
2793 /* Find if host supports multiqueue virtio_net device */
2794 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
2795 struct virtio_net_config,
2796 max_virtqueue_pairs, &max_queue_pairs);
2798 /* We need at least 2 queue's */
2799 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
2800 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
2801 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2802 max_queue_pairs = 1;
2804 /* Allocate ourselves a network device with room for our info */
2805 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
2809 /* Set up network device as normal. */
2810 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
2811 dev->netdev_ops = &virtnet_netdev;
2812 dev->features = NETIF_F_HIGHDMA;
2814 dev->ethtool_ops = &virtnet_ethtool_ops;
2815 SET_NETDEV_DEV(dev, &vdev->dev);
2817 /* Do we support "hardware" checksums? */
2818 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
2819 /* This opens up the world of extra features. */
2820 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2822 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2824 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
2825 dev->hw_features |= NETIF_F_TSO
2826 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
2828 /* Individual feature bits: what can host handle? */
2829 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
2830 dev->hw_features |= NETIF_F_TSO;
2831 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
2832 dev->hw_features |= NETIF_F_TSO6;
2833 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
2834 dev->hw_features |= NETIF_F_TSO_ECN;
2836 dev->features |= NETIF_F_GSO_ROBUST;
2839 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
2840 /* (!csum && gso) case will be fixed by register_netdev() */
2842 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
2843 dev->features |= NETIF_F_RXCSUM;
2845 dev->vlan_features = dev->features;
2847 /* MTU range: 68 - 65535 */
2848 dev->min_mtu = MIN_MTU;
2849 dev->max_mtu = MAX_MTU;
2851 /* Configuration may specify what MAC to use. Otherwise random. */
2852 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
2853 virtio_cread_bytes(vdev,
2854 offsetof(struct virtio_net_config, mac),
2855 dev->dev_addr, dev->addr_len);
2857 eth_hw_addr_random(dev);
2859 /* Set up our device-specific information */
2860 vi = netdev_priv(dev);
2865 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
2867 /* If we can receive ANY GSO packets, we must allocate large ones. */
2868 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2869 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2870 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
2871 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
2872 vi->big_packets = true;
2874 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
2875 vi->mergeable_rx_bufs = true;
2877 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
2878 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2879 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2881 vi->hdr_len = sizeof(struct virtio_net_hdr);
2883 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
2884 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2885 vi->any_header_sg = true;
2887 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2890 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2891 mtu = virtio_cread16(vdev,
2892 offsetof(struct virtio_net_config,
2894 if (mtu < dev->min_mtu) {
2895 /* Should never trigger: MTU was previously validated
2896 * in virtnet_validate.
2898 dev_err(&vdev->dev, "device MTU appears to have changed "
2899 "it is now %d < %d", mtu, dev->min_mtu);
2906 /* TODO: size buffers correctly in this case. */
2907 if (dev->mtu > ETH_DATA_LEN)
2908 vi->big_packets = true;
2911 if (vi->any_header_sg)
2912 dev->needed_headroom = vi->hdr_len;
2914 /* Enable multiqueue by default */
2915 if (num_online_cpus() >= max_queue_pairs)
2916 vi->curr_queue_pairs = max_queue_pairs;
2918 vi->curr_queue_pairs = num_online_cpus();
2919 vi->max_queue_pairs = max_queue_pairs;
2921 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
2927 if (vi->mergeable_rx_bufs)
2928 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
2930 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
2931 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
2933 virtnet_init_settings(dev);
2935 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
2936 vi->failover = net_failover_create(vi->dev);
2937 if (IS_ERR(vi->failover)) {
2938 err = PTR_ERR(vi->failover);
2943 err = register_netdev(dev);
2945 pr_debug("virtio_net: registering device failed\n");
2949 virtio_device_ready(vdev);
2951 err = virtnet_cpu_notif_add(vi);
2953 pr_debug("virtio_net: registering cpu notifier failed\n");
2954 goto free_unregister_netdev;
2957 virtnet_set_queues(vi, vi->curr_queue_pairs);
2959 /* Assume link up if device can't report link status,
2960 otherwise get link status from config. */
2961 netif_carrier_off(dev);
2962 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
2963 schedule_work(&vi->config_work);
2965 vi->status = VIRTIO_NET_S_LINK_UP;
2966 virtnet_update_settings(vi);
2967 netif_carrier_on(dev);
2970 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
2971 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
2972 set_bit(guest_offloads[i], &vi->guest_offloads);
2974 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
2975 dev->name, max_queue_pairs);
2979 free_unregister_netdev:
2980 vi->vdev->config->reset(vdev);
2982 unregister_netdev(dev);
2984 net_failover_destroy(vi->failover);
2986 cancel_delayed_work_sync(&vi->refill);
2987 free_receive_page_frags(vi);
2988 virtnet_del_vqs(vi);
2994 static void remove_vq_common(struct virtnet_info *vi)
2996 vi->vdev->config->reset(vi->vdev);
2998 /* Free unused buffers in both send and recv, if any. */
2999 free_unused_bufs(vi);
3001 free_receive_bufs(vi);
3003 free_receive_page_frags(vi);
3005 virtnet_del_vqs(vi);
3008 static void virtnet_remove(struct virtio_device *vdev)
3010 struct virtnet_info *vi = vdev->priv;
3012 virtnet_cpu_notif_remove(vi);
3014 /* Make sure no work handler is accessing the device. */
3015 flush_work(&vi->config_work);
3017 unregister_netdev(vi->dev);
3019 net_failover_destroy(vi->failover);
3021 remove_vq_common(vi);
3023 free_netdev(vi->dev);
3026 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
3028 struct virtnet_info *vi = vdev->priv;
3030 virtnet_cpu_notif_remove(vi);
3031 virtnet_freeze_down(vdev);
3032 remove_vq_common(vi);
3037 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
3039 struct virtnet_info *vi = vdev->priv;
3042 err = virtnet_restore_up(vdev);
3045 virtnet_set_queues(vi, vi->curr_queue_pairs);
3047 err = virtnet_cpu_notif_add(vi);
3054 static struct virtio_device_id id_table[] = {
3055 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
3059 #define VIRTNET_FEATURES \
3060 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
3062 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
3063 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
3064 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
3065 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
3066 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
3067 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
3068 VIRTIO_NET_F_CTRL_MAC_ADDR, \
3069 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
3070 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY
3072 static unsigned int features[] = {
3076 static unsigned int features_legacy[] = {
3079 VIRTIO_F_ANY_LAYOUT,
3082 static struct virtio_driver virtio_net_driver = {
3083 .feature_table = features,
3084 .feature_table_size = ARRAY_SIZE(features),
3085 .feature_table_legacy = features_legacy,
3086 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
3087 .driver.name = KBUILD_MODNAME,
3088 .driver.owner = THIS_MODULE,
3089 .id_table = id_table,
3090 .validate = virtnet_validate,
3091 .probe = virtnet_probe,
3092 .remove = virtnet_remove,
3093 .config_changed = virtnet_config_changed,
3094 #ifdef CONFIG_PM_SLEEP
3095 .freeze = virtnet_freeze,
3096 .restore = virtnet_restore,
3100 static __init int virtio_net_driver_init(void)
3104 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
3106 virtnet_cpu_down_prep);
3109 virtionet_online = ret;
3110 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
3111 NULL, virtnet_cpu_dead);
3115 ret = register_virtio_driver(&virtio_net_driver);
3120 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3122 cpuhp_remove_multi_state(virtionet_online);
3126 module_init(virtio_net_driver_init);
3128 static __exit void virtio_net_driver_exit(void)
3130 unregister_virtio_driver(&virtio_net_driver);
3131 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3132 cpuhp_remove_multi_state(virtionet_online);
3134 module_exit(virtio_net_driver_exit);
3136 MODULE_DEVICE_TABLE(virtio, id_table);
3137 MODULE_DESCRIPTION("Virtio network driver");
3138 MODULE_LICENSE("GPL");