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/scatterlist.h>
27 #include <linux/if_vlan.h>
28 #include <linux/slab.h>
29 #include <linux/cpu.h>
30 #include <linux/average.h>
31 #include <net/busy_poll.h>
33 static int napi_weight = NAPI_POLL_WEIGHT;
34 module_param(napi_weight, int, 0444);
36 static bool csum = true, gso = true;
37 module_param(csum, bool, 0444);
38 module_param(gso, bool, 0444);
40 /* FIXME: MTU in config. */
41 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
42 #define GOOD_COPY_LEN 128
44 /* RX packet size EWMA. The average packet size is used to determine the packet
45 * buffer size when refilling RX rings. As the entire RX ring may be refilled
46 * at once, the weight is chosen so that the EWMA will be insensitive to short-
47 * term, transient changes in packet size.
49 DECLARE_EWMA(pkt_len, 1, 64)
51 /* Minimum alignment for mergeable packet buffers. */
52 #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256)
54 #define VIRTNET_DRIVER_VERSION "1.0.0"
56 struct virtnet_stats {
57 struct u64_stats_sync tx_syncp;
58 struct u64_stats_sync rx_syncp;
66 /* Internal representation of a send virtqueue */
68 /* Virtqueue associated with this send _queue */
71 /* TX: fragments + linear part + virtio header */
72 struct scatterlist sg[MAX_SKB_FRAGS + 2];
74 /* Name of the send queue: output.$index */
78 /* Internal representation of a receive virtqueue */
79 struct receive_queue {
80 /* Virtqueue associated with this receive_queue */
83 struct napi_struct napi;
85 struct bpf_prog __rcu *xdp_prog;
87 /* Chain pages by the private ptr. */
90 /* Average packet length for mergeable receive buffers. */
91 struct ewma_pkt_len mrg_avg_pkt_len;
93 /* Page frag for packet buffer allocation. */
94 struct page_frag alloc_frag;
96 /* RX: fragments + linear part + virtio header */
97 struct scatterlist sg[MAX_SKB_FRAGS + 2];
99 /* Name of this receive queue: input.$index */
103 struct virtnet_info {
104 struct virtio_device *vdev;
105 struct virtqueue *cvq;
106 struct net_device *dev;
107 struct send_queue *sq;
108 struct receive_queue *rq;
111 /* Max # of queue pairs supported by the device */
114 /* # of queue pairs currently used by the driver */
115 u16 curr_queue_pairs;
117 /* # of XDP queue pairs currently used by the driver */
120 /* I like... big packets and I cannot lie! */
123 /* Host will merge rx buffers for big packets (shake it! shake it!) */
124 bool mergeable_rx_bufs;
126 /* Has control virtqueue */
129 /* Host can handle any s/g split between our header and packet data */
132 /* Packet virtio header size */
135 /* Active statistics */
136 struct virtnet_stats __percpu *stats;
138 /* Work struct for refilling if we run low on memory. */
139 struct delayed_work refill;
141 /* Work struct for config space updates */
142 struct work_struct config_work;
144 /* Does the affinity hint is set for virtqueues? */
145 bool affinity_hint_set;
147 /* CPU hotplug instances for online & dead */
148 struct hlist_node node;
149 struct hlist_node node_dead;
151 /* Control VQ buffers: protected by the rtnl lock */
152 struct virtio_net_ctrl_hdr ctrl_hdr;
153 virtio_net_ctrl_ack ctrl_status;
154 struct virtio_net_ctrl_mq ctrl_mq;
159 /* Ethtool settings */
164 struct padded_vnet_hdr {
165 struct virtio_net_hdr_mrg_rxbuf hdr;
167 * hdr is in a separate sg buffer, and data sg buffer shares same page
168 * with this header sg. This padding makes next sg 16 byte aligned
174 /* Converting between virtqueue no. and kernel tx/rx queue no.
175 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
177 static int vq2txq(struct virtqueue *vq)
179 return (vq->index - 1) / 2;
182 static int txq2vq(int txq)
187 static int vq2rxq(struct virtqueue *vq)
189 return vq->index / 2;
192 static int rxq2vq(int rxq)
197 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
199 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
203 * private is used to chain pages for big packets, put the whole
204 * most recent used list in the beginning for reuse
206 static void give_pages(struct receive_queue *rq, struct page *page)
210 /* Find end of list, sew whole thing into vi->rq.pages. */
211 for (end = page; end->private; end = (struct page *)end->private);
212 end->private = (unsigned long)rq->pages;
216 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
218 struct page *p = rq->pages;
221 rq->pages = (struct page *)p->private;
222 /* clear private here, it is used to chain pages */
225 p = alloc_page(gfp_mask);
229 static void skb_xmit_done(struct virtqueue *vq)
231 struct virtnet_info *vi = vq->vdev->priv;
233 /* Suppress further interrupts. */
234 virtqueue_disable_cb(vq);
236 /* We were probably waiting for more output buffers. */
237 netif_wake_subqueue(vi->dev, vq2txq(vq));
240 static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx)
242 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1);
243 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN;
246 static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx)
248 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN);
252 static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize)
254 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN;
255 return (unsigned long)buf | (size - 1);
258 /* Called from bottom half context */
259 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
260 struct receive_queue *rq,
261 struct page *page, unsigned int offset,
262 unsigned int len, unsigned int truesize)
265 struct virtio_net_hdr_mrg_rxbuf *hdr;
266 unsigned int copy, hdr_len, hdr_padded_len;
269 p = page_address(page) + offset;
271 /* copy small packet so we can reuse these pages for small data */
272 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
276 hdr = skb_vnet_hdr(skb);
278 hdr_len = vi->hdr_len;
279 if (vi->mergeable_rx_bufs)
280 hdr_padded_len = sizeof *hdr;
282 hdr_padded_len = sizeof(struct padded_vnet_hdr);
284 memcpy(hdr, p, hdr_len);
287 offset += hdr_padded_len;
291 if (copy > skb_tailroom(skb))
292 copy = skb_tailroom(skb);
293 memcpy(skb_put(skb, copy), p, copy);
298 if (vi->mergeable_rx_bufs) {
300 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
307 * Verify that we can indeed put this data into a skb.
308 * This is here to handle cases when the device erroneously
309 * tries to receive more than is possible. This is usually
310 * the case of a broken device.
312 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
313 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
317 BUG_ON(offset >= PAGE_SIZE);
319 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
320 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
321 frag_size, truesize);
323 page = (struct page *)page->private;
328 give_pages(rq, page);
333 static void virtnet_xdp_xmit(struct virtnet_info *vi,
334 struct receive_queue *rq,
335 struct send_queue *sq,
336 struct xdp_buff *xdp)
338 struct page *page = virt_to_head_page(xdp->data);
339 struct virtio_net_hdr_mrg_rxbuf *hdr;
340 unsigned int num_sg, len;
344 /* Free up any pending old buffers before queueing new ones. */
345 while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) {
346 struct page *sent_page = virt_to_head_page(xdp_sent);
348 if (vi->mergeable_rx_bufs)
351 give_pages(rq, sent_page);
354 /* Zero header and leave csum up to XDP layers */
356 memset(hdr, 0, vi->hdr_len);
359 sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data);
360 err = virtqueue_add_outbuf(sq->vq, sq->sg, num_sg,
361 xdp->data, GFP_ATOMIC);
363 if (vi->mergeable_rx_bufs)
366 give_pages(rq, page);
367 return; // On error abort to avoid unnecessary kick
368 } else if (!vi->mergeable_rx_bufs) {
369 /* If not mergeable bufs must be big packets so cleanup pages */
370 give_pages(rq, (struct page *)page->private);
374 virtqueue_kick(sq->vq);
377 static u32 do_xdp_prog(struct virtnet_info *vi,
378 struct receive_queue *rq,
379 struct bpf_prog *xdp_prog,
380 struct page *page, int offset, int len)
388 buf = page_address(page) + offset;
390 if (vi->mergeable_rx_bufs)
391 hdr_padded_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
393 hdr_padded_len = sizeof(struct padded_vnet_hdr);
395 xdp.data = buf + hdr_padded_len;
396 xdp.data_end = xdp.data + (len - vi->hdr_len);
398 act = bpf_prog_run_xdp(xdp_prog, &xdp);
403 qp = vi->curr_queue_pairs -
404 vi->xdp_queue_pairs +
406 xdp.data = buf + (vi->mergeable_rx_bufs ? 0 : 4);
407 virtnet_xdp_xmit(vi, rq, &vi->sq[qp], &xdp);
410 bpf_warn_invalid_xdp_action(act);
417 static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len)
419 struct sk_buff * skb = buf;
427 static struct sk_buff *receive_big(struct net_device *dev,
428 struct virtnet_info *vi,
429 struct receive_queue *rq,
433 struct bpf_prog *xdp_prog;
434 struct page *page = buf;
438 xdp_prog = rcu_dereference(rq->xdp_prog);
440 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
443 if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags))
445 act = do_xdp_prog(vi, rq, xdp_prog, page, 0, len);
459 skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
468 dev->stats.rx_dropped++;
469 give_pages(rq, page);
474 /* The conditions to enable XDP should preclude the underlying device from
475 * sending packets across multiple buffers (num_buf > 1). However per spec
476 * it does not appear to be illegal to do so but rather just against convention.
477 * So in order to avoid making a system unresponsive the packets are pushed
478 * into a page and the XDP program is run. This will be extremely slow and we
479 * push a warning to the user to fix this as soon as possible. Fixing this may
480 * require resolving the underlying hardware to determine why multiple buffers
481 * are being received or simply loading the XDP program in the ingress stack
482 * after the skb is built because there is no advantage to running it here
485 static struct page *xdp_linearize_page(struct receive_queue *rq,
491 struct page *page = alloc_page(GFP_ATOMIC);
492 unsigned int page_off = 0;
497 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
506 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &buflen);
510 /* guard against a misconfigured or uncooperative backend that
511 * is sending packet larger than the MTU.
513 if ((page_off + buflen) > PAGE_SIZE)
516 buf = mergeable_ctx_to_buf_address(ctx);
517 p = virt_to_head_page(buf);
518 off = buf - page_address(p);
520 memcpy(page_address(page) + page_off,
521 page_address(p) + off, buflen);
528 __free_pages(page, 0);
532 static struct sk_buff *receive_mergeable(struct net_device *dev,
533 struct virtnet_info *vi,
534 struct receive_queue *rq,
538 void *buf = mergeable_ctx_to_buf_address(ctx);
539 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
540 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
541 struct page *page = virt_to_head_page(buf);
542 int offset = buf - page_address(page);
543 struct sk_buff *head_skb, *curr_skb;
544 struct bpf_prog *xdp_prog;
545 unsigned int truesize;
550 xdp_prog = rcu_dereference(rq->xdp_prog);
552 struct page *xdp_page;
555 /* This happens when rx buffer size is underestimated */
556 if (unlikely(num_buf > 1)) {
557 /* linearize data for XDP */
558 xdp_page = xdp_linearize_page(rq, num_buf,
567 /* Transient failure which in theory could occur if
568 * in-flight packets from before XDP was enabled reach
569 * the receive path after XDP is loaded. In practice I
570 * was not able to create this condition.
572 if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags))
575 act = do_xdp_prog(vi, rq, xdp_prog, xdp_page, offset, len);
578 if (unlikely(xdp_page != page))
579 __free_pages(xdp_page, 0);
582 if (unlikely(xdp_page != page))
588 if (unlikely(xdp_page != page))
589 __free_pages(xdp_page, 0);
595 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
596 head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
599 if (unlikely(!curr_skb))
604 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
605 if (unlikely(!ctx)) {
606 pr_debug("%s: rx error: %d buffers out of %d missing\n",
608 virtio16_to_cpu(vi->vdev,
610 dev->stats.rx_length_errors++;
614 buf = mergeable_ctx_to_buf_address(ctx);
615 page = virt_to_head_page(buf);
617 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
618 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
619 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
623 if (curr_skb == head_skb)
624 skb_shinfo(curr_skb)->frag_list = nskb;
626 curr_skb->next = nskb;
628 head_skb->truesize += nskb->truesize;
631 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
632 if (curr_skb != head_skb) {
633 head_skb->data_len += len;
634 head_skb->len += len;
635 head_skb->truesize += truesize;
637 offset = buf - page_address(page);
638 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
640 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
643 skb_add_rx_frag(curr_skb, num_skb_frags, page,
644 offset, len, truesize);
648 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
656 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
657 if (unlikely(!ctx)) {
658 pr_debug("%s: rx error: %d buffers missing\n",
660 dev->stats.rx_length_errors++;
663 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
667 dev->stats.rx_dropped++;
668 dev_kfree_skb(head_skb);
673 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
674 void *buf, unsigned int len)
676 struct net_device *dev = vi->dev;
677 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
679 struct virtio_net_hdr_mrg_rxbuf *hdr;
681 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
682 pr_debug("%s: short packet %i\n", dev->name, len);
683 dev->stats.rx_length_errors++;
684 if (vi->mergeable_rx_bufs) {
685 unsigned long ctx = (unsigned long)buf;
686 void *base = mergeable_ctx_to_buf_address(ctx);
687 put_page(virt_to_head_page(base));
688 } else if (vi->big_packets) {
696 if (vi->mergeable_rx_bufs)
697 skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
698 else if (vi->big_packets)
699 skb = receive_big(dev, vi, rq, buf, len);
701 skb = receive_small(vi, buf, len);
706 hdr = skb_vnet_hdr(skb);
708 u64_stats_update_begin(&stats->rx_syncp);
709 stats->rx_bytes += skb->len;
711 u64_stats_update_end(&stats->rx_syncp);
713 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
714 skb->ip_summed = CHECKSUM_UNNECESSARY;
716 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
717 virtio_is_little_endian(vi->vdev))) {
718 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
719 dev->name, hdr->hdr.gso_type,
724 skb->protocol = eth_type_trans(skb, dev);
725 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
726 ntohs(skb->protocol), skb->len, skb->pkt_type);
728 napi_gro_receive(&rq->napi, skb);
732 dev->stats.rx_frame_errors++;
736 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
740 struct virtio_net_hdr_mrg_rxbuf *hdr;
743 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
747 skb_put(skb, GOOD_PACKET_LEN);
749 hdr = skb_vnet_hdr(skb);
750 sg_init_table(rq->sg, 2);
751 sg_set_buf(rq->sg, hdr, vi->hdr_len);
752 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
754 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
761 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
764 struct page *first, *list = NULL;
768 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
770 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
771 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
772 first = get_a_page(rq, gfp);
775 give_pages(rq, list);
778 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
780 /* chain new page in list head to match sg */
781 first->private = (unsigned long)list;
785 first = get_a_page(rq, gfp);
787 give_pages(rq, list);
790 p = page_address(first);
792 /* rq->sg[0], rq->sg[1] share the same page */
793 /* a separated rq->sg[0] for header - required in case !any_header_sg */
794 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
796 /* rq->sg[1] for data packet, from offset */
797 offset = sizeof(struct padded_vnet_hdr);
798 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
800 /* chain first in list head */
801 first->private = (unsigned long)list;
802 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
805 give_pages(rq, first);
810 static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len)
812 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
815 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
816 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
817 return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
820 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
822 struct page_frag *alloc_frag = &rq->alloc_frag;
826 unsigned int len, hole;
828 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
829 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
832 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
833 ctx = mergeable_buf_to_ctx(buf, len);
834 get_page(alloc_frag->page);
835 alloc_frag->offset += len;
836 hole = alloc_frag->size - alloc_frag->offset;
838 /* To avoid internal fragmentation, if there is very likely not
839 * enough space for another buffer, add the remaining space to
840 * the current buffer. This extra space is not included in
841 * the truesize stored in ctx.
844 alloc_frag->offset += hole;
847 sg_init_one(rq->sg, buf, len);
848 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
850 put_page(virt_to_head_page(buf));
856 * Returns false if we couldn't fill entirely (OOM).
858 * Normally run in the receive path, but can also be run from ndo_open
859 * before we're receiving packets, or from refill_work which is
860 * careful to disable receiving (using napi_disable).
862 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
870 if (vi->mergeable_rx_bufs)
871 err = add_recvbuf_mergeable(rq, gfp);
872 else if (vi->big_packets)
873 err = add_recvbuf_big(vi, rq, gfp);
875 err = add_recvbuf_small(vi, rq, gfp);
877 oom = err == -ENOMEM;
880 } while (rq->vq->num_free);
881 virtqueue_kick(rq->vq);
885 static void skb_recv_done(struct virtqueue *rvq)
887 struct virtnet_info *vi = rvq->vdev->priv;
888 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
890 /* Schedule NAPI, Suppress further interrupts if successful. */
891 if (napi_schedule_prep(&rq->napi)) {
892 virtqueue_disable_cb(rvq);
893 __napi_schedule(&rq->napi);
897 static void virtnet_napi_enable(struct receive_queue *rq)
899 napi_enable(&rq->napi);
901 /* If all buffers were filled by other side before we napi_enabled, we
902 * won't get another interrupt, so process any outstanding packets
903 * now. virtnet_poll wants re-enable the queue, so we disable here.
904 * We synchronize against interrupts via NAPI_STATE_SCHED */
905 if (napi_schedule_prep(&rq->napi)) {
906 virtqueue_disable_cb(rq->vq);
908 __napi_schedule(&rq->napi);
913 static void refill_work(struct work_struct *work)
915 struct virtnet_info *vi =
916 container_of(work, struct virtnet_info, refill.work);
920 for (i = 0; i < vi->curr_queue_pairs; i++) {
921 struct receive_queue *rq = &vi->rq[i];
923 napi_disable(&rq->napi);
924 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
925 virtnet_napi_enable(rq);
927 /* In theory, this can happen: if we don't get any buffers in
928 * we will *never* try to fill again.
931 schedule_delayed_work(&vi->refill, HZ/2);
935 static int virtnet_receive(struct receive_queue *rq, int budget)
937 struct virtnet_info *vi = rq->vq->vdev->priv;
938 unsigned int len, received = 0;
941 while (received < budget &&
942 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
943 receive_buf(vi, rq, buf, len);
947 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
948 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
949 schedule_delayed_work(&vi->refill, 0);
955 static int virtnet_poll(struct napi_struct *napi, int budget)
957 struct receive_queue *rq =
958 container_of(napi, struct receive_queue, napi);
959 unsigned int r, received;
961 received = virtnet_receive(rq, budget);
963 /* Out of packets? */
964 if (received < budget) {
965 r = virtqueue_enable_cb_prepare(rq->vq);
966 napi_complete_done(napi, received);
967 if (unlikely(virtqueue_poll(rq->vq, r)) &&
968 napi_schedule_prep(napi)) {
969 virtqueue_disable_cb(rq->vq);
970 __napi_schedule(napi);
977 #ifdef CONFIG_NET_RX_BUSY_POLL
978 /* must be called with local_bh_disable()d */
979 static int virtnet_busy_poll(struct napi_struct *napi)
981 struct receive_queue *rq =
982 container_of(napi, struct receive_queue, napi);
983 struct virtnet_info *vi = rq->vq->vdev->priv;
984 int r, received = 0, budget = 4;
986 if (!(vi->status & VIRTIO_NET_S_LINK_UP))
987 return LL_FLUSH_FAILED;
989 if (!napi_schedule_prep(napi))
990 return LL_FLUSH_BUSY;
992 virtqueue_disable_cb(rq->vq);
995 received += virtnet_receive(rq, budget);
997 r = virtqueue_enable_cb_prepare(rq->vq);
998 clear_bit(NAPI_STATE_SCHED, &napi->state);
999 if (unlikely(virtqueue_poll(rq->vq, r)) &&
1000 napi_schedule_prep(napi)) {
1001 virtqueue_disable_cb(rq->vq);
1002 if (received < budget) {
1006 __napi_schedule(napi);
1012 #endif /* CONFIG_NET_RX_BUSY_POLL */
1014 static int virtnet_open(struct net_device *dev)
1016 struct virtnet_info *vi = netdev_priv(dev);
1019 for (i = 0; i < vi->max_queue_pairs; i++) {
1020 if (i < vi->curr_queue_pairs)
1021 /* Make sure we have some buffers: if oom use wq. */
1022 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1023 schedule_delayed_work(&vi->refill, 0);
1024 virtnet_napi_enable(&vi->rq[i]);
1030 static void free_old_xmit_skbs(struct send_queue *sq)
1032 struct sk_buff *skb;
1034 struct virtnet_info *vi = sq->vq->vdev->priv;
1035 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
1037 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1038 pr_debug("Sent skb %p\n", skb);
1040 u64_stats_update_begin(&stats->tx_syncp);
1041 stats->tx_bytes += skb->len;
1042 stats->tx_packets++;
1043 u64_stats_update_end(&stats->tx_syncp);
1045 dev_kfree_skb_any(skb);
1049 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1051 struct virtio_net_hdr_mrg_rxbuf *hdr;
1052 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1053 struct virtnet_info *vi = sq->vq->vdev->priv;
1055 unsigned hdr_len = vi->hdr_len;
1058 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1060 can_push = vi->any_header_sg &&
1061 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1062 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1063 /* Even if we can, don't push here yet as this would skew
1064 * csum_start offset below. */
1066 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1068 hdr = skb_vnet_hdr(skb);
1070 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1071 virtio_is_little_endian(vi->vdev)))
1074 if (vi->mergeable_rx_bufs)
1075 hdr->num_buffers = 0;
1077 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1079 __skb_push(skb, hdr_len);
1080 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1081 /* Pull header back to avoid skew in tx bytes calculations. */
1082 __skb_pull(skb, hdr_len);
1084 sg_set_buf(sq->sg, hdr, hdr_len);
1085 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
1087 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1090 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1092 struct virtnet_info *vi = netdev_priv(dev);
1093 int qnum = skb_get_queue_mapping(skb);
1094 struct send_queue *sq = &vi->sq[qnum];
1096 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1097 bool kick = !skb->xmit_more;
1099 /* Free up any pending old buffers before queueing new ones. */
1100 free_old_xmit_skbs(sq);
1102 /* timestamp packet in software */
1103 skb_tx_timestamp(skb);
1105 /* Try to transmit */
1106 err = xmit_skb(sq, skb);
1108 /* This should not happen! */
1109 if (unlikely(err)) {
1110 dev->stats.tx_fifo_errors++;
1111 if (net_ratelimit())
1113 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
1114 dev->stats.tx_dropped++;
1115 dev_kfree_skb_any(skb);
1116 return NETDEV_TX_OK;
1119 /* Don't wait up for transmitted skbs to be freed. */
1123 /* If running out of space, stop queue to avoid getting packets that we
1124 * are then unable to transmit.
1125 * An alternative would be to force queuing layer to requeue the skb by
1126 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1127 * returned in a normal path of operation: it means that driver is not
1128 * maintaining the TX queue stop/start state properly, and causes
1129 * the stack to do a non-trivial amount of useless work.
1130 * Since most packets only take 1 or 2 ring slots, stopping the queue
1131 * early means 16 slots are typically wasted.
1133 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1134 netif_stop_subqueue(dev, qnum);
1135 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1136 /* More just got used, free them then recheck. */
1137 free_old_xmit_skbs(sq);
1138 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1139 netif_start_subqueue(dev, qnum);
1140 virtqueue_disable_cb(sq->vq);
1145 if (kick || netif_xmit_stopped(txq))
1146 virtqueue_kick(sq->vq);
1148 return NETDEV_TX_OK;
1152 * Send command via the control virtqueue and check status. Commands
1153 * supported by the hypervisor, as indicated by feature bits, should
1154 * never fail unless improperly formatted.
1156 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1157 struct scatterlist *out)
1159 struct scatterlist *sgs[4], hdr, stat;
1160 unsigned out_num = 0, tmp;
1162 /* Caller should know better */
1163 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1165 vi->ctrl_status = ~0;
1166 vi->ctrl_hdr.class = class;
1167 vi->ctrl_hdr.cmd = cmd;
1169 sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr));
1170 sgs[out_num++] = &hdr;
1173 sgs[out_num++] = out;
1175 /* Add return status. */
1176 sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status));
1177 sgs[out_num] = &stat;
1179 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1180 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1182 if (unlikely(!virtqueue_kick(vi->cvq)))
1183 return vi->ctrl_status == VIRTIO_NET_OK;
1185 /* Spin for a response, the kick causes an ioport write, trapping
1186 * into the hypervisor, so the request should be handled immediately.
1188 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1189 !virtqueue_is_broken(vi->cvq))
1192 return vi->ctrl_status == VIRTIO_NET_OK;
1195 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1197 struct virtnet_info *vi = netdev_priv(dev);
1198 struct virtio_device *vdev = vi->vdev;
1200 struct sockaddr *addr;
1201 struct scatterlist sg;
1203 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
1206 memcpy(addr, p, sizeof(*addr));
1208 ret = eth_prepare_mac_addr_change(dev, addr);
1212 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1213 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1214 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1215 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1216 dev_warn(&vdev->dev,
1217 "Failed to set mac address by vq command.\n");
1221 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1222 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1225 /* Naturally, this has an atomicity problem. */
1226 for (i = 0; i < dev->addr_len; i++)
1227 virtio_cwrite8(vdev,
1228 offsetof(struct virtio_net_config, mac) +
1229 i, addr->sa_data[i]);
1232 eth_commit_mac_addr_change(dev, p);
1240 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
1241 struct rtnl_link_stats64 *tot)
1243 struct virtnet_info *vi = netdev_priv(dev);
1247 for_each_possible_cpu(cpu) {
1248 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
1249 u64 tpackets, tbytes, rpackets, rbytes;
1252 start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
1253 tpackets = stats->tx_packets;
1254 tbytes = stats->tx_bytes;
1255 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
1258 start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
1259 rpackets = stats->rx_packets;
1260 rbytes = stats->rx_bytes;
1261 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
1263 tot->rx_packets += rpackets;
1264 tot->tx_packets += tpackets;
1265 tot->rx_bytes += rbytes;
1266 tot->tx_bytes += tbytes;
1269 tot->tx_dropped = dev->stats.tx_dropped;
1270 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1271 tot->rx_dropped = dev->stats.rx_dropped;
1272 tot->rx_length_errors = dev->stats.rx_length_errors;
1273 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1278 #ifdef CONFIG_NET_POLL_CONTROLLER
1279 static void virtnet_netpoll(struct net_device *dev)
1281 struct virtnet_info *vi = netdev_priv(dev);
1284 for (i = 0; i < vi->curr_queue_pairs; i++)
1285 napi_schedule(&vi->rq[i].napi);
1289 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1292 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1293 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1294 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1298 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1300 struct scatterlist sg;
1301 struct net_device *dev = vi->dev;
1303 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1306 vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1307 sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq));
1309 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1310 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1311 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1315 vi->curr_queue_pairs = queue_pairs;
1316 /* virtnet_open() will refill when device is going to up. */
1317 if (dev->flags & IFF_UP)
1318 schedule_delayed_work(&vi->refill, 0);
1324 static int virtnet_close(struct net_device *dev)
1326 struct virtnet_info *vi = netdev_priv(dev);
1329 /* Make sure refill_work doesn't re-enable napi! */
1330 cancel_delayed_work_sync(&vi->refill);
1332 for (i = 0; i < vi->max_queue_pairs; i++)
1333 napi_disable(&vi->rq[i].napi);
1338 static void virtnet_set_rx_mode(struct net_device *dev)
1340 struct virtnet_info *vi = netdev_priv(dev);
1341 struct scatterlist sg[2];
1342 struct virtio_net_ctrl_mac *mac_data;
1343 struct netdev_hw_addr *ha;
1349 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1350 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1353 vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0);
1354 vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1356 sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc));
1358 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1359 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1360 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1361 vi->ctrl_promisc ? "en" : "dis");
1363 sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti));
1365 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1366 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1367 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1368 vi->ctrl_allmulti ? "en" : "dis");
1370 uc_count = netdev_uc_count(dev);
1371 mc_count = netdev_mc_count(dev);
1372 /* MAC filter - use one buffer for both lists */
1373 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1374 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1379 sg_init_table(sg, 2);
1381 /* Store the unicast list and count in the front of the buffer */
1382 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1384 netdev_for_each_uc_addr(ha, dev)
1385 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1387 sg_set_buf(&sg[0], mac_data,
1388 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1390 /* multicast list and count fill the end */
1391 mac_data = (void *)&mac_data->macs[uc_count][0];
1393 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1395 netdev_for_each_mc_addr(ha, dev)
1396 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1398 sg_set_buf(&sg[1], mac_data,
1399 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1401 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1402 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1403 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1408 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1409 __be16 proto, u16 vid)
1411 struct virtnet_info *vi = netdev_priv(dev);
1412 struct scatterlist sg;
1415 sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid));
1417 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1418 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1419 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1423 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1424 __be16 proto, u16 vid)
1426 struct virtnet_info *vi = netdev_priv(dev);
1427 struct scatterlist sg;
1430 sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid));
1432 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1433 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1434 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1438 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1442 if (vi->affinity_hint_set) {
1443 for (i = 0; i < vi->max_queue_pairs; i++) {
1444 virtqueue_set_affinity(vi->rq[i].vq, -1);
1445 virtqueue_set_affinity(vi->sq[i].vq, -1);
1448 vi->affinity_hint_set = false;
1452 static void virtnet_set_affinity(struct virtnet_info *vi)
1457 /* In multiqueue mode, when the number of cpu is equal to the number of
1458 * queue pairs, we let the queue pairs to be private to one cpu by
1459 * setting the affinity hint to eliminate the contention.
1461 if (vi->curr_queue_pairs == 1 ||
1462 vi->max_queue_pairs != num_online_cpus()) {
1463 virtnet_clean_affinity(vi, -1);
1468 for_each_online_cpu(cpu) {
1469 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1470 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1471 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1475 vi->affinity_hint_set = true;
1478 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
1480 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1482 virtnet_set_affinity(vi);
1486 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
1488 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1490 virtnet_set_affinity(vi);
1494 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
1496 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1499 virtnet_clean_affinity(vi, cpu);
1503 static enum cpuhp_state virtionet_online;
1505 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
1509 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
1512 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1516 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1520 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
1522 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1523 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1527 static void virtnet_get_ringparam(struct net_device *dev,
1528 struct ethtool_ringparam *ring)
1530 struct virtnet_info *vi = netdev_priv(dev);
1532 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1533 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1534 ring->rx_pending = ring->rx_max_pending;
1535 ring->tx_pending = ring->tx_max_pending;
1539 static void virtnet_get_drvinfo(struct net_device *dev,
1540 struct ethtool_drvinfo *info)
1542 struct virtnet_info *vi = netdev_priv(dev);
1543 struct virtio_device *vdev = vi->vdev;
1545 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1546 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1547 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1551 /* TODO: Eliminate OOO packets during switching */
1552 static int virtnet_set_channels(struct net_device *dev,
1553 struct ethtool_channels *channels)
1555 struct virtnet_info *vi = netdev_priv(dev);
1556 u16 queue_pairs = channels->combined_count;
1559 /* We don't support separate rx/tx channels.
1560 * We don't allow setting 'other' channels.
1562 if (channels->rx_count || channels->tx_count || channels->other_count)
1565 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1568 /* For now we don't support modifying channels while XDP is loaded
1569 * also when XDP is loaded all RX queues have XDP programs so we only
1570 * need to check a single RX queue.
1572 if (vi->rq[0].xdp_prog)
1576 err = virtnet_set_queues(vi, queue_pairs);
1578 netif_set_real_num_tx_queues(dev, queue_pairs);
1579 netif_set_real_num_rx_queues(dev, queue_pairs);
1581 virtnet_set_affinity(vi);
1588 static void virtnet_get_channels(struct net_device *dev,
1589 struct ethtool_channels *channels)
1591 struct virtnet_info *vi = netdev_priv(dev);
1593 channels->combined_count = vi->curr_queue_pairs;
1594 channels->max_combined = vi->max_queue_pairs;
1595 channels->max_other = 0;
1596 channels->rx_count = 0;
1597 channels->tx_count = 0;
1598 channels->other_count = 0;
1601 /* Check if the user is trying to change anything besides speed/duplex */
1602 static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd)
1604 struct ethtool_cmd diff1 = *cmd;
1605 struct ethtool_cmd diff2 = {};
1607 /* cmd is always set so we need to clear it, validate the port type
1608 * and also without autonegotiation we can ignore advertising
1610 ethtool_cmd_speed_set(&diff1, 0);
1611 diff2.port = PORT_OTHER;
1612 diff1.advertising = 0;
1616 return !memcmp(&diff1, &diff2, sizeof(diff1));
1619 static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1621 struct virtnet_info *vi = netdev_priv(dev);
1624 speed = ethtool_cmd_speed(cmd);
1625 /* don't allow custom speed and duplex */
1626 if (!ethtool_validate_speed(speed) ||
1627 !ethtool_validate_duplex(cmd->duplex) ||
1628 !virtnet_validate_ethtool_cmd(cmd))
1631 vi->duplex = cmd->duplex;
1636 static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1638 struct virtnet_info *vi = netdev_priv(dev);
1640 ethtool_cmd_speed_set(cmd, vi->speed);
1641 cmd->duplex = vi->duplex;
1642 cmd->port = PORT_OTHER;
1647 static void virtnet_init_settings(struct net_device *dev)
1649 struct virtnet_info *vi = netdev_priv(dev);
1651 vi->speed = SPEED_UNKNOWN;
1652 vi->duplex = DUPLEX_UNKNOWN;
1655 static const struct ethtool_ops virtnet_ethtool_ops = {
1656 .get_drvinfo = virtnet_get_drvinfo,
1657 .get_link = ethtool_op_get_link,
1658 .get_ringparam = virtnet_get_ringparam,
1659 .set_channels = virtnet_set_channels,
1660 .get_channels = virtnet_get_channels,
1661 .get_ts_info = ethtool_op_get_ts_info,
1662 .get_settings = virtnet_get_settings,
1663 .set_settings = virtnet_set_settings,
1666 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog)
1668 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
1669 struct virtnet_info *vi = netdev_priv(dev);
1670 struct bpf_prog *old_prog;
1671 u16 xdp_qp = 0, curr_qp;
1674 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1675 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6)) {
1676 netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n");
1680 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
1681 netdev_warn(dev, "XDP expects header/data in single page, any_header_sg required\n");
1685 if (dev->mtu > max_sz) {
1686 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
1690 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
1692 xdp_qp = nr_cpu_ids;
1694 /* XDP requires extra queues for XDP_TX */
1695 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
1696 netdev_warn(dev, "request %i queues but max is %i\n",
1697 curr_qp + xdp_qp, vi->max_queue_pairs);
1701 err = virtnet_set_queues(vi, curr_qp + xdp_qp);
1703 dev_warn(&dev->dev, "XDP Device queue allocation failure.\n");
1708 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1);
1710 virtnet_set_queues(vi, curr_qp);
1711 return PTR_ERR(prog);
1715 vi->xdp_queue_pairs = xdp_qp;
1716 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
1718 for (i = 0; i < vi->max_queue_pairs; i++) {
1719 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
1720 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
1722 bpf_prog_put(old_prog);
1728 static bool virtnet_xdp_query(struct net_device *dev)
1730 struct virtnet_info *vi = netdev_priv(dev);
1733 for (i = 0; i < vi->max_queue_pairs; i++) {
1734 if (vi->rq[i].xdp_prog)
1740 static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp)
1742 switch (xdp->command) {
1743 case XDP_SETUP_PROG:
1744 return virtnet_xdp_set(dev, xdp->prog);
1745 case XDP_QUERY_PROG:
1746 xdp->prog_attached = virtnet_xdp_query(dev);
1753 static const struct net_device_ops virtnet_netdev = {
1754 .ndo_open = virtnet_open,
1755 .ndo_stop = virtnet_close,
1756 .ndo_start_xmit = start_xmit,
1757 .ndo_validate_addr = eth_validate_addr,
1758 .ndo_set_mac_address = virtnet_set_mac_address,
1759 .ndo_set_rx_mode = virtnet_set_rx_mode,
1760 .ndo_get_stats64 = virtnet_stats,
1761 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1762 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1763 #ifdef CONFIG_NET_POLL_CONTROLLER
1764 .ndo_poll_controller = virtnet_netpoll,
1766 #ifdef CONFIG_NET_RX_BUSY_POLL
1767 .ndo_busy_poll = virtnet_busy_poll,
1769 .ndo_xdp = virtnet_xdp,
1772 static void virtnet_config_changed_work(struct work_struct *work)
1774 struct virtnet_info *vi =
1775 container_of(work, struct virtnet_info, config_work);
1778 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
1779 struct virtio_net_config, status, &v) < 0)
1782 if (v & VIRTIO_NET_S_ANNOUNCE) {
1783 netdev_notify_peers(vi->dev);
1784 virtnet_ack_link_announce(vi);
1787 /* Ignore unknown (future) status bits */
1788 v &= VIRTIO_NET_S_LINK_UP;
1790 if (vi->status == v)
1795 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1796 netif_carrier_on(vi->dev);
1797 netif_tx_wake_all_queues(vi->dev);
1799 netif_carrier_off(vi->dev);
1800 netif_tx_stop_all_queues(vi->dev);
1804 static void virtnet_config_changed(struct virtio_device *vdev)
1806 struct virtnet_info *vi = vdev->priv;
1808 schedule_work(&vi->config_work);
1811 static void virtnet_free_queues(struct virtnet_info *vi)
1815 for (i = 0; i < vi->max_queue_pairs; i++) {
1816 napi_hash_del(&vi->rq[i].napi);
1817 netif_napi_del(&vi->rq[i].napi);
1820 /* We called napi_hash_del() before netif_napi_del(),
1821 * we need to respect an RCU grace period before freeing vi->rq
1829 static void free_receive_bufs(struct virtnet_info *vi)
1831 struct bpf_prog *old_prog;
1835 for (i = 0; i < vi->max_queue_pairs; i++) {
1836 while (vi->rq[i].pages)
1837 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1839 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
1840 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
1842 bpf_prog_put(old_prog);
1847 static void free_receive_page_frags(struct virtnet_info *vi)
1850 for (i = 0; i < vi->max_queue_pairs; i++)
1851 if (vi->rq[i].alloc_frag.page)
1852 put_page(vi->rq[i].alloc_frag.page);
1855 static bool is_xdp_queue(struct virtnet_info *vi, int q)
1857 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1859 else if (q < vi->curr_queue_pairs)
1865 static void free_unused_bufs(struct virtnet_info *vi)
1870 for (i = 0; i < vi->max_queue_pairs; i++) {
1871 struct virtqueue *vq = vi->sq[i].vq;
1872 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1873 if (!is_xdp_queue(vi, i))
1876 put_page(virt_to_head_page(buf));
1880 for (i = 0; i < vi->max_queue_pairs; i++) {
1881 struct virtqueue *vq = vi->rq[i].vq;
1883 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1884 if (vi->mergeable_rx_bufs) {
1885 unsigned long ctx = (unsigned long)buf;
1886 void *base = mergeable_ctx_to_buf_address(ctx);
1887 put_page(virt_to_head_page(base));
1888 } else if (vi->big_packets) {
1889 give_pages(&vi->rq[i], buf);
1897 static void virtnet_del_vqs(struct virtnet_info *vi)
1899 struct virtio_device *vdev = vi->vdev;
1901 virtnet_clean_affinity(vi, -1);
1903 vdev->config->del_vqs(vdev);
1905 virtnet_free_queues(vi);
1908 static int virtnet_find_vqs(struct virtnet_info *vi)
1910 vq_callback_t **callbacks;
1911 struct virtqueue **vqs;
1916 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1917 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1918 * possible control vq.
1920 total_vqs = vi->max_queue_pairs * 2 +
1921 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1923 /* Allocate space for find_vqs parameters */
1924 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1927 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1930 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1934 /* Parameters for control virtqueue, if any */
1936 callbacks[total_vqs - 1] = NULL;
1937 names[total_vqs - 1] = "control";
1940 /* Allocate/initialize parameters for send/receive virtqueues */
1941 for (i = 0; i < vi->max_queue_pairs; i++) {
1942 callbacks[rxq2vq(i)] = skb_recv_done;
1943 callbacks[txq2vq(i)] = skb_xmit_done;
1944 sprintf(vi->rq[i].name, "input.%d", i);
1945 sprintf(vi->sq[i].name, "output.%d", i);
1946 names[rxq2vq(i)] = vi->rq[i].name;
1947 names[txq2vq(i)] = vi->sq[i].name;
1950 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1956 vi->cvq = vqs[total_vqs - 1];
1957 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1958 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1961 for (i = 0; i < vi->max_queue_pairs; i++) {
1962 vi->rq[i].vq = vqs[rxq2vq(i)];
1963 vi->sq[i].vq = vqs[txq2vq(i)];
1982 static int virtnet_alloc_queues(struct virtnet_info *vi)
1986 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1989 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1993 INIT_DELAYED_WORK(&vi->refill, refill_work);
1994 for (i = 0; i < vi->max_queue_pairs; i++) {
1995 vi->rq[i].pages = NULL;
1996 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1999 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2000 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2001 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2012 static int init_vqs(struct virtnet_info *vi)
2016 /* Allocate send & receive queues */
2017 ret = virtnet_alloc_queues(vi);
2021 ret = virtnet_find_vqs(vi);
2026 virtnet_set_affinity(vi);
2032 virtnet_free_queues(vi);
2038 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2039 struct rx_queue_attribute *attribute, char *buf)
2041 struct virtnet_info *vi = netdev_priv(queue->dev);
2042 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2043 struct ewma_pkt_len *avg;
2045 BUG_ON(queue_index >= vi->max_queue_pairs);
2046 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2047 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
2050 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2051 __ATTR_RO(mergeable_rx_buffer_size);
2053 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2054 &mergeable_rx_buffer_size_attribute.attr,
2058 static const struct attribute_group virtio_net_mrg_rx_group = {
2059 .name = "virtio_net",
2060 .attrs = virtio_net_mrg_rx_attrs
2064 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2066 const char *fname, const char *dname)
2068 if (!virtio_has_feature(vdev, fbit))
2071 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2077 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2078 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2080 static bool virtnet_validate_features(struct virtio_device *vdev)
2082 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2083 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2084 "VIRTIO_NET_F_CTRL_VQ") ||
2085 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2086 "VIRTIO_NET_F_CTRL_VQ") ||
2087 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2088 "VIRTIO_NET_F_CTRL_VQ") ||
2089 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2090 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2091 "VIRTIO_NET_F_CTRL_VQ"))) {
2098 #define MIN_MTU ETH_MIN_MTU
2099 #define MAX_MTU ETH_MAX_MTU
2101 static int virtnet_probe(struct virtio_device *vdev)
2104 struct net_device *dev;
2105 struct virtnet_info *vi;
2106 u16 max_queue_pairs;
2109 if (!vdev->config->get) {
2110 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2115 if (!virtnet_validate_features(vdev))
2118 /* Find if host supports multiqueue virtio_net device */
2119 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
2120 struct virtio_net_config,
2121 max_virtqueue_pairs, &max_queue_pairs);
2123 /* We need at least 2 queue's */
2124 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
2125 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
2126 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2127 max_queue_pairs = 1;
2129 /* Allocate ourselves a network device with room for our info */
2130 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
2134 /* Set up network device as normal. */
2135 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
2136 dev->netdev_ops = &virtnet_netdev;
2137 dev->features = NETIF_F_HIGHDMA;
2139 dev->ethtool_ops = &virtnet_ethtool_ops;
2140 SET_NETDEV_DEV(dev, &vdev->dev);
2142 /* Do we support "hardware" checksums? */
2143 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
2144 /* This opens up the world of extra features. */
2145 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2147 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2149 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
2150 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
2151 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
2153 /* Individual feature bits: what can host handle? */
2154 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
2155 dev->hw_features |= NETIF_F_TSO;
2156 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
2157 dev->hw_features |= NETIF_F_TSO6;
2158 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
2159 dev->hw_features |= NETIF_F_TSO_ECN;
2160 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
2161 dev->hw_features |= NETIF_F_UFO;
2163 dev->features |= NETIF_F_GSO_ROBUST;
2166 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
2167 /* (!csum && gso) case will be fixed by register_netdev() */
2169 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
2170 dev->features |= NETIF_F_RXCSUM;
2172 dev->vlan_features = dev->features;
2174 /* MTU range: 68 - 65535 */
2175 dev->min_mtu = MIN_MTU;
2176 dev->max_mtu = MAX_MTU;
2178 /* Configuration may specify what MAC to use. Otherwise random. */
2179 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
2180 virtio_cread_bytes(vdev,
2181 offsetof(struct virtio_net_config, mac),
2182 dev->dev_addr, dev->addr_len);
2184 eth_hw_addr_random(dev);
2186 /* Set up our device-specific information */
2187 vi = netdev_priv(dev);
2191 vi->stats = alloc_percpu(struct virtnet_stats);
2193 if (vi->stats == NULL)
2196 for_each_possible_cpu(i) {
2197 struct virtnet_stats *virtnet_stats;
2198 virtnet_stats = per_cpu_ptr(vi->stats, i);
2199 u64_stats_init(&virtnet_stats->tx_syncp);
2200 u64_stats_init(&virtnet_stats->rx_syncp);
2203 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
2205 /* If we can receive ANY GSO packets, we must allocate large ones. */
2206 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2207 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2208 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
2209 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
2210 vi->big_packets = true;
2212 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
2213 vi->mergeable_rx_bufs = true;
2215 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
2216 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2217 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2219 vi->hdr_len = sizeof(struct virtio_net_hdr);
2221 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
2222 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2223 vi->any_header_sg = true;
2225 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2228 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2229 mtu = virtio_cread16(vdev,
2230 offsetof(struct virtio_net_config,
2232 if (mtu < dev->min_mtu) {
2233 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2240 if (vi->any_header_sg)
2241 dev->needed_headroom = vi->hdr_len;
2243 /* Enable multiqueue by default */
2244 if (num_online_cpus() >= max_queue_pairs)
2245 vi->curr_queue_pairs = max_queue_pairs;
2247 vi->curr_queue_pairs = num_online_cpus();
2248 vi->max_queue_pairs = max_queue_pairs;
2250 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
2256 if (vi->mergeable_rx_bufs)
2257 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
2259 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
2260 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
2262 virtnet_init_settings(dev);
2264 err = register_netdev(dev);
2266 pr_debug("virtio_net: registering device failed\n");
2270 virtio_device_ready(vdev);
2272 err = virtnet_cpu_notif_add(vi);
2274 pr_debug("virtio_net: registering cpu notifier failed\n");
2275 goto free_unregister_netdev;
2279 virtnet_set_queues(vi, vi->curr_queue_pairs);
2282 /* Assume link up if device can't report link status,
2283 otherwise get link status from config. */
2284 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
2285 netif_carrier_off(dev);
2286 schedule_work(&vi->config_work);
2288 vi->status = VIRTIO_NET_S_LINK_UP;
2289 netif_carrier_on(dev);
2292 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
2293 dev->name, max_queue_pairs);
2297 free_unregister_netdev:
2298 vi->vdev->config->reset(vdev);
2300 unregister_netdev(dev);
2302 cancel_delayed_work_sync(&vi->refill);
2303 free_receive_page_frags(vi);
2304 virtnet_del_vqs(vi);
2306 free_percpu(vi->stats);
2312 static void remove_vq_common(struct virtnet_info *vi)
2314 vi->vdev->config->reset(vi->vdev);
2316 /* Free unused buffers in both send and recv, if any. */
2317 free_unused_bufs(vi);
2319 free_receive_bufs(vi);
2321 free_receive_page_frags(vi);
2323 virtnet_del_vqs(vi);
2326 static void virtnet_remove(struct virtio_device *vdev)
2328 struct virtnet_info *vi = vdev->priv;
2330 virtnet_cpu_notif_remove(vi);
2332 /* Make sure no work handler is accessing the device. */
2333 flush_work(&vi->config_work);
2335 unregister_netdev(vi->dev);
2337 remove_vq_common(vi);
2339 free_percpu(vi->stats);
2340 free_netdev(vi->dev);
2343 #ifdef CONFIG_PM_SLEEP
2344 static int virtnet_freeze(struct virtio_device *vdev)
2346 struct virtnet_info *vi = vdev->priv;
2349 virtnet_cpu_notif_remove(vi);
2351 /* Make sure no work handler is accessing the device */
2352 flush_work(&vi->config_work);
2354 netif_device_detach(vi->dev);
2355 cancel_delayed_work_sync(&vi->refill);
2357 if (netif_running(vi->dev)) {
2358 for (i = 0; i < vi->max_queue_pairs; i++)
2359 napi_disable(&vi->rq[i].napi);
2362 remove_vq_common(vi);
2367 static int virtnet_restore(struct virtio_device *vdev)
2369 struct virtnet_info *vi = vdev->priv;
2376 virtio_device_ready(vdev);
2378 if (netif_running(vi->dev)) {
2379 for (i = 0; i < vi->curr_queue_pairs; i++)
2380 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2381 schedule_delayed_work(&vi->refill, 0);
2383 for (i = 0; i < vi->max_queue_pairs; i++)
2384 virtnet_napi_enable(&vi->rq[i]);
2387 netif_device_attach(vi->dev);
2390 virtnet_set_queues(vi, vi->curr_queue_pairs);
2393 err = virtnet_cpu_notif_add(vi);
2401 static struct virtio_device_id id_table[] = {
2402 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
2406 #define VIRTNET_FEATURES \
2407 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
2409 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
2410 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
2411 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
2412 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
2413 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
2414 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
2415 VIRTIO_NET_F_CTRL_MAC_ADDR, \
2418 static unsigned int features[] = {
2422 static unsigned int features_legacy[] = {
2425 VIRTIO_F_ANY_LAYOUT,
2428 static struct virtio_driver virtio_net_driver = {
2429 .feature_table = features,
2430 .feature_table_size = ARRAY_SIZE(features),
2431 .feature_table_legacy = features_legacy,
2432 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
2433 .driver.name = KBUILD_MODNAME,
2434 .driver.owner = THIS_MODULE,
2435 .id_table = id_table,
2436 .probe = virtnet_probe,
2437 .remove = virtnet_remove,
2438 .config_changed = virtnet_config_changed,
2439 #ifdef CONFIG_PM_SLEEP
2440 .freeze = virtnet_freeze,
2441 .restore = virtnet_restore,
2445 static __init int virtio_net_driver_init(void)
2449 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "AP_VIRT_NET_ONLINE",
2451 virtnet_cpu_down_prep);
2454 virtionet_online = ret;
2455 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "VIRT_NET_DEAD",
2456 NULL, virtnet_cpu_dead);
2460 ret = register_virtio_driver(&virtio_net_driver);
2465 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
2467 cpuhp_remove_multi_state(virtionet_online);
2471 module_init(virtio_net_driver_init);
2473 static __exit void virtio_net_driver_exit(void)
2475 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
2476 cpuhp_remove_multi_state(virtionet_online);
2477 unregister_virtio_driver(&virtio_net_driver);
2479 module_exit(virtio_net_driver_exit);
2481 MODULE_DEVICE_TABLE(virtio, id_table);
2482 MODULE_DESCRIPTION("Virtio network driver");
2483 MODULE_LICENSE("GPL");