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))
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 buf = mergeable_ctx_to_buf_address(ctx);
511 p = virt_to_head_page(buf);
512 off = buf - page_address(p);
514 /* guard against a misconfigured or uncooperative backend that
515 * is sending packet larger than the MTU.
517 if ((page_off + buflen) > PAGE_SIZE) {
522 memcpy(page_address(page) + page_off,
523 page_address(p) + off, buflen);
531 __free_pages(page, 0);
535 static struct sk_buff *receive_mergeable(struct net_device *dev,
536 struct virtnet_info *vi,
537 struct receive_queue *rq,
541 void *buf = mergeable_ctx_to_buf_address(ctx);
542 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
543 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
544 struct page *page = virt_to_head_page(buf);
545 int offset = buf - page_address(page);
546 struct sk_buff *head_skb, *curr_skb;
547 struct bpf_prog *xdp_prog;
548 unsigned int truesize;
553 xdp_prog = rcu_dereference(rq->xdp_prog);
555 struct page *xdp_page;
558 /* This happens when rx buffer size is underestimated */
559 if (unlikely(num_buf > 1)) {
560 /* linearize data for XDP */
561 xdp_page = xdp_linearize_page(rq, &num_buf,
570 /* Transient failure which in theory could occur if
571 * in-flight packets from before XDP was enabled reach
572 * the receive path after XDP is loaded. In practice I
573 * was not able to create this condition.
575 if (unlikely(hdr->hdr.gso_type))
578 act = do_xdp_prog(vi, rq, xdp_prog, xdp_page, offset, len);
581 /* We can only create skb based on xdp_page. */
582 if (unlikely(xdp_page != page)) {
585 head_skb = page_to_skb(vi, rq, xdp_page,
587 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
592 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
593 if (unlikely(xdp_page != page))
599 if (unlikely(xdp_page != page))
600 __free_pages(xdp_page, 0);
601 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
607 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
608 head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
611 if (unlikely(!curr_skb))
616 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
617 if (unlikely(!ctx)) {
618 pr_debug("%s: rx error: %d buffers out of %d missing\n",
620 virtio16_to_cpu(vi->vdev,
622 dev->stats.rx_length_errors++;
626 buf = mergeable_ctx_to_buf_address(ctx);
627 page = virt_to_head_page(buf);
629 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
630 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
631 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
635 if (curr_skb == head_skb)
636 skb_shinfo(curr_skb)->frag_list = nskb;
638 curr_skb->next = nskb;
640 head_skb->truesize += nskb->truesize;
643 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
644 if (curr_skb != head_skb) {
645 head_skb->data_len += len;
646 head_skb->len += len;
647 head_skb->truesize += truesize;
649 offset = buf - page_address(page);
650 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
652 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
655 skb_add_rx_frag(curr_skb, num_skb_frags, page,
656 offset, len, truesize);
660 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
668 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
669 if (unlikely(!ctx)) {
670 pr_debug("%s: rx error: %d buffers missing\n",
672 dev->stats.rx_length_errors++;
675 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
679 dev->stats.rx_dropped++;
680 dev_kfree_skb(head_skb);
685 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
686 void *buf, unsigned int len)
688 struct net_device *dev = vi->dev;
689 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
691 struct virtio_net_hdr_mrg_rxbuf *hdr;
693 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
694 pr_debug("%s: short packet %i\n", dev->name, len);
695 dev->stats.rx_length_errors++;
696 if (vi->mergeable_rx_bufs) {
697 unsigned long ctx = (unsigned long)buf;
698 void *base = mergeable_ctx_to_buf_address(ctx);
699 put_page(virt_to_head_page(base));
700 } else if (vi->big_packets) {
708 if (vi->mergeable_rx_bufs)
709 skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
710 else if (vi->big_packets)
711 skb = receive_big(dev, vi, rq, buf, len);
713 skb = receive_small(vi, buf, len);
718 hdr = skb_vnet_hdr(skb);
720 u64_stats_update_begin(&stats->rx_syncp);
721 stats->rx_bytes += skb->len;
723 u64_stats_update_end(&stats->rx_syncp);
725 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
726 skb->ip_summed = CHECKSUM_UNNECESSARY;
728 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
729 virtio_is_little_endian(vi->vdev))) {
730 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
731 dev->name, hdr->hdr.gso_type,
736 skb->protocol = eth_type_trans(skb, dev);
737 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
738 ntohs(skb->protocol), skb->len, skb->pkt_type);
740 napi_gro_receive(&rq->napi, skb);
744 dev->stats.rx_frame_errors++;
748 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
752 struct virtio_net_hdr_mrg_rxbuf *hdr;
755 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
759 skb_put(skb, GOOD_PACKET_LEN);
761 hdr = skb_vnet_hdr(skb);
762 sg_init_table(rq->sg, 2);
763 sg_set_buf(rq->sg, hdr, vi->hdr_len);
764 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
766 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
773 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
776 struct page *first, *list = NULL;
780 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
782 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
783 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
784 first = get_a_page(rq, gfp);
787 give_pages(rq, list);
790 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
792 /* chain new page in list head to match sg */
793 first->private = (unsigned long)list;
797 first = get_a_page(rq, gfp);
799 give_pages(rq, list);
802 p = page_address(first);
804 /* rq->sg[0], rq->sg[1] share the same page */
805 /* a separated rq->sg[0] for header - required in case !any_header_sg */
806 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
808 /* rq->sg[1] for data packet, from offset */
809 offset = sizeof(struct padded_vnet_hdr);
810 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
812 /* chain first in list head */
813 first->private = (unsigned long)list;
814 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
817 give_pages(rq, first);
822 static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len)
824 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
827 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
828 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
829 return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
832 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
834 struct page_frag *alloc_frag = &rq->alloc_frag;
838 unsigned int len, hole;
840 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
841 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
844 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
845 ctx = mergeable_buf_to_ctx(buf, len);
846 get_page(alloc_frag->page);
847 alloc_frag->offset += len;
848 hole = alloc_frag->size - alloc_frag->offset;
850 /* To avoid internal fragmentation, if there is very likely not
851 * enough space for another buffer, add the remaining space to
852 * the current buffer. This extra space is not included in
853 * the truesize stored in ctx.
856 alloc_frag->offset += hole;
859 sg_init_one(rq->sg, buf, len);
860 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
862 put_page(virt_to_head_page(buf));
868 * Returns false if we couldn't fill entirely (OOM).
870 * Normally run in the receive path, but can also be run from ndo_open
871 * before we're receiving packets, or from refill_work which is
872 * careful to disable receiving (using napi_disable).
874 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
882 if (vi->mergeable_rx_bufs)
883 err = add_recvbuf_mergeable(rq, gfp);
884 else if (vi->big_packets)
885 err = add_recvbuf_big(vi, rq, gfp);
887 err = add_recvbuf_small(vi, rq, gfp);
889 oom = err == -ENOMEM;
892 } while (rq->vq->num_free);
893 virtqueue_kick(rq->vq);
897 static void skb_recv_done(struct virtqueue *rvq)
899 struct virtnet_info *vi = rvq->vdev->priv;
900 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
902 /* Schedule NAPI, Suppress further interrupts if successful. */
903 if (napi_schedule_prep(&rq->napi)) {
904 virtqueue_disable_cb(rvq);
905 __napi_schedule(&rq->napi);
909 static void virtnet_napi_enable(struct receive_queue *rq)
911 napi_enable(&rq->napi);
913 /* If all buffers were filled by other side before we napi_enabled, we
914 * won't get another interrupt, so process any outstanding packets
915 * now. virtnet_poll wants re-enable the queue, so we disable here.
916 * We synchronize against interrupts via NAPI_STATE_SCHED */
917 if (napi_schedule_prep(&rq->napi)) {
918 virtqueue_disable_cb(rq->vq);
920 __napi_schedule(&rq->napi);
925 static void refill_work(struct work_struct *work)
927 struct virtnet_info *vi =
928 container_of(work, struct virtnet_info, refill.work);
932 for (i = 0; i < vi->curr_queue_pairs; i++) {
933 struct receive_queue *rq = &vi->rq[i];
935 napi_disable(&rq->napi);
936 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
937 virtnet_napi_enable(rq);
939 /* In theory, this can happen: if we don't get any buffers in
940 * we will *never* try to fill again.
943 schedule_delayed_work(&vi->refill, HZ/2);
947 static int virtnet_receive(struct receive_queue *rq, int budget)
949 struct virtnet_info *vi = rq->vq->vdev->priv;
950 unsigned int len, received = 0;
953 while (received < budget &&
954 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
955 receive_buf(vi, rq, buf, len);
959 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
960 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
961 schedule_delayed_work(&vi->refill, 0);
967 static int virtnet_poll(struct napi_struct *napi, int budget)
969 struct receive_queue *rq =
970 container_of(napi, struct receive_queue, napi);
971 unsigned int r, received;
973 received = virtnet_receive(rq, budget);
975 /* Out of packets? */
976 if (received < budget) {
977 r = virtqueue_enable_cb_prepare(rq->vq);
978 napi_complete_done(napi, received);
979 if (unlikely(virtqueue_poll(rq->vq, r)) &&
980 napi_schedule_prep(napi)) {
981 virtqueue_disable_cb(rq->vq);
982 __napi_schedule(napi);
989 #ifdef CONFIG_NET_RX_BUSY_POLL
990 /* must be called with local_bh_disable()d */
991 static int virtnet_busy_poll(struct napi_struct *napi)
993 struct receive_queue *rq =
994 container_of(napi, struct receive_queue, napi);
995 struct virtnet_info *vi = rq->vq->vdev->priv;
996 int r, received = 0, budget = 4;
998 if (!(vi->status & VIRTIO_NET_S_LINK_UP))
999 return LL_FLUSH_FAILED;
1001 if (!napi_schedule_prep(napi))
1002 return LL_FLUSH_BUSY;
1004 virtqueue_disable_cb(rq->vq);
1007 received += virtnet_receive(rq, budget);
1009 r = virtqueue_enable_cb_prepare(rq->vq);
1010 clear_bit(NAPI_STATE_SCHED, &napi->state);
1011 if (unlikely(virtqueue_poll(rq->vq, r)) &&
1012 napi_schedule_prep(napi)) {
1013 virtqueue_disable_cb(rq->vq);
1014 if (received < budget) {
1018 __napi_schedule(napi);
1024 #endif /* CONFIG_NET_RX_BUSY_POLL */
1026 static int virtnet_open(struct net_device *dev)
1028 struct virtnet_info *vi = netdev_priv(dev);
1031 for (i = 0; i < vi->max_queue_pairs; i++) {
1032 if (i < vi->curr_queue_pairs)
1033 /* Make sure we have some buffers: if oom use wq. */
1034 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1035 schedule_delayed_work(&vi->refill, 0);
1036 virtnet_napi_enable(&vi->rq[i]);
1042 static void free_old_xmit_skbs(struct send_queue *sq)
1044 struct sk_buff *skb;
1046 struct virtnet_info *vi = sq->vq->vdev->priv;
1047 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
1049 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1050 pr_debug("Sent skb %p\n", skb);
1052 u64_stats_update_begin(&stats->tx_syncp);
1053 stats->tx_bytes += skb->len;
1054 stats->tx_packets++;
1055 u64_stats_update_end(&stats->tx_syncp);
1057 dev_kfree_skb_any(skb);
1061 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1063 struct virtio_net_hdr_mrg_rxbuf *hdr;
1064 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1065 struct virtnet_info *vi = sq->vq->vdev->priv;
1067 unsigned hdr_len = vi->hdr_len;
1070 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1072 can_push = vi->any_header_sg &&
1073 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1074 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1075 /* Even if we can, don't push here yet as this would skew
1076 * csum_start offset below. */
1078 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1080 hdr = skb_vnet_hdr(skb);
1082 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1083 virtio_is_little_endian(vi->vdev)))
1086 if (vi->mergeable_rx_bufs)
1087 hdr->num_buffers = 0;
1089 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1091 __skb_push(skb, hdr_len);
1092 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1093 /* Pull header back to avoid skew in tx bytes calculations. */
1094 __skb_pull(skb, hdr_len);
1096 sg_set_buf(sq->sg, hdr, hdr_len);
1097 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
1099 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1102 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1104 struct virtnet_info *vi = netdev_priv(dev);
1105 int qnum = skb_get_queue_mapping(skb);
1106 struct send_queue *sq = &vi->sq[qnum];
1108 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1109 bool kick = !skb->xmit_more;
1111 /* Free up any pending old buffers before queueing new ones. */
1112 free_old_xmit_skbs(sq);
1114 /* timestamp packet in software */
1115 skb_tx_timestamp(skb);
1117 /* Try to transmit */
1118 err = xmit_skb(sq, skb);
1120 /* This should not happen! */
1121 if (unlikely(err)) {
1122 dev->stats.tx_fifo_errors++;
1123 if (net_ratelimit())
1125 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
1126 dev->stats.tx_dropped++;
1127 dev_kfree_skb_any(skb);
1128 return NETDEV_TX_OK;
1131 /* Don't wait up for transmitted skbs to be freed. */
1135 /* If running out of space, stop queue to avoid getting packets that we
1136 * are then unable to transmit.
1137 * An alternative would be to force queuing layer to requeue the skb by
1138 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1139 * returned in a normal path of operation: it means that driver is not
1140 * maintaining the TX queue stop/start state properly, and causes
1141 * the stack to do a non-trivial amount of useless work.
1142 * Since most packets only take 1 or 2 ring slots, stopping the queue
1143 * early means 16 slots are typically wasted.
1145 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1146 netif_stop_subqueue(dev, qnum);
1147 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1148 /* More just got used, free them then recheck. */
1149 free_old_xmit_skbs(sq);
1150 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1151 netif_start_subqueue(dev, qnum);
1152 virtqueue_disable_cb(sq->vq);
1157 if (kick || netif_xmit_stopped(txq))
1158 virtqueue_kick(sq->vq);
1160 return NETDEV_TX_OK;
1164 * Send command via the control virtqueue and check status. Commands
1165 * supported by the hypervisor, as indicated by feature bits, should
1166 * never fail unless improperly formatted.
1168 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1169 struct scatterlist *out)
1171 struct scatterlist *sgs[4], hdr, stat;
1172 unsigned out_num = 0, tmp;
1174 /* Caller should know better */
1175 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1177 vi->ctrl_status = ~0;
1178 vi->ctrl_hdr.class = class;
1179 vi->ctrl_hdr.cmd = cmd;
1181 sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr));
1182 sgs[out_num++] = &hdr;
1185 sgs[out_num++] = out;
1187 /* Add return status. */
1188 sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status));
1189 sgs[out_num] = &stat;
1191 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1192 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1194 if (unlikely(!virtqueue_kick(vi->cvq)))
1195 return vi->ctrl_status == VIRTIO_NET_OK;
1197 /* Spin for a response, the kick causes an ioport write, trapping
1198 * into the hypervisor, so the request should be handled immediately.
1200 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1201 !virtqueue_is_broken(vi->cvq))
1204 return vi->ctrl_status == VIRTIO_NET_OK;
1207 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1209 struct virtnet_info *vi = netdev_priv(dev);
1210 struct virtio_device *vdev = vi->vdev;
1212 struct sockaddr *addr;
1213 struct scatterlist sg;
1215 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
1218 memcpy(addr, p, sizeof(*addr));
1220 ret = eth_prepare_mac_addr_change(dev, addr);
1224 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1225 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1226 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1227 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1228 dev_warn(&vdev->dev,
1229 "Failed to set mac address by vq command.\n");
1233 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1234 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1237 /* Naturally, this has an atomicity problem. */
1238 for (i = 0; i < dev->addr_len; i++)
1239 virtio_cwrite8(vdev,
1240 offsetof(struct virtio_net_config, mac) +
1241 i, addr->sa_data[i]);
1244 eth_commit_mac_addr_change(dev, p);
1252 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
1253 struct rtnl_link_stats64 *tot)
1255 struct virtnet_info *vi = netdev_priv(dev);
1259 for_each_possible_cpu(cpu) {
1260 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
1261 u64 tpackets, tbytes, rpackets, rbytes;
1264 start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
1265 tpackets = stats->tx_packets;
1266 tbytes = stats->tx_bytes;
1267 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
1270 start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
1271 rpackets = stats->rx_packets;
1272 rbytes = stats->rx_bytes;
1273 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
1275 tot->rx_packets += rpackets;
1276 tot->tx_packets += tpackets;
1277 tot->rx_bytes += rbytes;
1278 tot->tx_bytes += tbytes;
1281 tot->tx_dropped = dev->stats.tx_dropped;
1282 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1283 tot->rx_dropped = dev->stats.rx_dropped;
1284 tot->rx_length_errors = dev->stats.rx_length_errors;
1285 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1290 #ifdef CONFIG_NET_POLL_CONTROLLER
1291 static void virtnet_netpoll(struct net_device *dev)
1293 struct virtnet_info *vi = netdev_priv(dev);
1296 for (i = 0; i < vi->curr_queue_pairs; i++)
1297 napi_schedule(&vi->rq[i].napi);
1301 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1304 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1305 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1306 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1310 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1312 struct scatterlist sg;
1313 struct net_device *dev = vi->dev;
1315 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1318 vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1319 sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq));
1321 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1322 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1323 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1327 vi->curr_queue_pairs = queue_pairs;
1328 /* virtnet_open() will refill when device is going to up. */
1329 if (dev->flags & IFF_UP)
1330 schedule_delayed_work(&vi->refill, 0);
1336 static int virtnet_close(struct net_device *dev)
1338 struct virtnet_info *vi = netdev_priv(dev);
1341 /* Make sure refill_work doesn't re-enable napi! */
1342 cancel_delayed_work_sync(&vi->refill);
1344 for (i = 0; i < vi->max_queue_pairs; i++)
1345 napi_disable(&vi->rq[i].napi);
1350 static void virtnet_set_rx_mode(struct net_device *dev)
1352 struct virtnet_info *vi = netdev_priv(dev);
1353 struct scatterlist sg[2];
1354 struct virtio_net_ctrl_mac *mac_data;
1355 struct netdev_hw_addr *ha;
1361 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1362 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1365 vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0);
1366 vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1368 sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc));
1370 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1371 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1372 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1373 vi->ctrl_promisc ? "en" : "dis");
1375 sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti));
1377 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1378 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1379 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1380 vi->ctrl_allmulti ? "en" : "dis");
1382 uc_count = netdev_uc_count(dev);
1383 mc_count = netdev_mc_count(dev);
1384 /* MAC filter - use one buffer for both lists */
1385 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1386 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1391 sg_init_table(sg, 2);
1393 /* Store the unicast list and count in the front of the buffer */
1394 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1396 netdev_for_each_uc_addr(ha, dev)
1397 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1399 sg_set_buf(&sg[0], mac_data,
1400 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1402 /* multicast list and count fill the end */
1403 mac_data = (void *)&mac_data->macs[uc_count][0];
1405 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1407 netdev_for_each_mc_addr(ha, dev)
1408 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1410 sg_set_buf(&sg[1], mac_data,
1411 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1413 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1414 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1415 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1420 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1421 __be16 proto, u16 vid)
1423 struct virtnet_info *vi = netdev_priv(dev);
1424 struct scatterlist sg;
1427 sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid));
1429 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1430 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1431 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1435 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1436 __be16 proto, u16 vid)
1438 struct virtnet_info *vi = netdev_priv(dev);
1439 struct scatterlist sg;
1442 sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid));
1444 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1445 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1446 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1450 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1454 if (vi->affinity_hint_set) {
1455 for (i = 0; i < vi->max_queue_pairs; i++) {
1456 virtqueue_set_affinity(vi->rq[i].vq, -1);
1457 virtqueue_set_affinity(vi->sq[i].vq, -1);
1460 vi->affinity_hint_set = false;
1464 static void virtnet_set_affinity(struct virtnet_info *vi)
1469 /* In multiqueue mode, when the number of cpu is equal to the number of
1470 * queue pairs, we let the queue pairs to be private to one cpu by
1471 * setting the affinity hint to eliminate the contention.
1473 if (vi->curr_queue_pairs == 1 ||
1474 vi->max_queue_pairs != num_online_cpus()) {
1475 virtnet_clean_affinity(vi, -1);
1480 for_each_online_cpu(cpu) {
1481 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1482 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1483 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1487 vi->affinity_hint_set = true;
1490 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
1492 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1494 virtnet_set_affinity(vi);
1498 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
1500 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1502 virtnet_set_affinity(vi);
1506 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
1508 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1511 virtnet_clean_affinity(vi, cpu);
1515 static enum cpuhp_state virtionet_online;
1517 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
1521 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
1524 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1528 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1532 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
1534 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1535 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1539 static void virtnet_get_ringparam(struct net_device *dev,
1540 struct ethtool_ringparam *ring)
1542 struct virtnet_info *vi = netdev_priv(dev);
1544 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1545 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1546 ring->rx_pending = ring->rx_max_pending;
1547 ring->tx_pending = ring->tx_max_pending;
1551 static void virtnet_get_drvinfo(struct net_device *dev,
1552 struct ethtool_drvinfo *info)
1554 struct virtnet_info *vi = netdev_priv(dev);
1555 struct virtio_device *vdev = vi->vdev;
1557 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1558 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1559 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1563 /* TODO: Eliminate OOO packets during switching */
1564 static int virtnet_set_channels(struct net_device *dev,
1565 struct ethtool_channels *channels)
1567 struct virtnet_info *vi = netdev_priv(dev);
1568 u16 queue_pairs = channels->combined_count;
1571 /* We don't support separate rx/tx channels.
1572 * We don't allow setting 'other' channels.
1574 if (channels->rx_count || channels->tx_count || channels->other_count)
1577 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1580 /* For now we don't support modifying channels while XDP is loaded
1581 * also when XDP is loaded all RX queues have XDP programs so we only
1582 * need to check a single RX queue.
1584 if (vi->rq[0].xdp_prog)
1588 err = virtnet_set_queues(vi, queue_pairs);
1590 netif_set_real_num_tx_queues(dev, queue_pairs);
1591 netif_set_real_num_rx_queues(dev, queue_pairs);
1593 virtnet_set_affinity(vi);
1600 static void virtnet_get_channels(struct net_device *dev,
1601 struct ethtool_channels *channels)
1603 struct virtnet_info *vi = netdev_priv(dev);
1605 channels->combined_count = vi->curr_queue_pairs;
1606 channels->max_combined = vi->max_queue_pairs;
1607 channels->max_other = 0;
1608 channels->rx_count = 0;
1609 channels->tx_count = 0;
1610 channels->other_count = 0;
1613 /* Check if the user is trying to change anything besides speed/duplex */
1614 static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd)
1616 struct ethtool_cmd diff1 = *cmd;
1617 struct ethtool_cmd diff2 = {};
1619 /* cmd is always set so we need to clear it, validate the port type
1620 * and also without autonegotiation we can ignore advertising
1622 ethtool_cmd_speed_set(&diff1, 0);
1623 diff2.port = PORT_OTHER;
1624 diff1.advertising = 0;
1628 return !memcmp(&diff1, &diff2, sizeof(diff1));
1631 static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1633 struct virtnet_info *vi = netdev_priv(dev);
1636 speed = ethtool_cmd_speed(cmd);
1637 /* don't allow custom speed and duplex */
1638 if (!ethtool_validate_speed(speed) ||
1639 !ethtool_validate_duplex(cmd->duplex) ||
1640 !virtnet_validate_ethtool_cmd(cmd))
1643 vi->duplex = cmd->duplex;
1648 static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1650 struct virtnet_info *vi = netdev_priv(dev);
1652 ethtool_cmd_speed_set(cmd, vi->speed);
1653 cmd->duplex = vi->duplex;
1654 cmd->port = PORT_OTHER;
1659 static void virtnet_init_settings(struct net_device *dev)
1661 struct virtnet_info *vi = netdev_priv(dev);
1663 vi->speed = SPEED_UNKNOWN;
1664 vi->duplex = DUPLEX_UNKNOWN;
1667 static const struct ethtool_ops virtnet_ethtool_ops = {
1668 .get_drvinfo = virtnet_get_drvinfo,
1669 .get_link = ethtool_op_get_link,
1670 .get_ringparam = virtnet_get_ringparam,
1671 .set_channels = virtnet_set_channels,
1672 .get_channels = virtnet_get_channels,
1673 .get_ts_info = ethtool_op_get_ts_info,
1674 .get_settings = virtnet_get_settings,
1675 .set_settings = virtnet_set_settings,
1678 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog)
1680 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
1681 struct virtnet_info *vi = netdev_priv(dev);
1682 struct bpf_prog *old_prog;
1683 u16 xdp_qp = 0, curr_qp;
1686 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1687 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6)) {
1688 netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n");
1692 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
1693 netdev_warn(dev, "XDP expects header/data in single page, any_header_sg required\n");
1697 if (dev->mtu > max_sz) {
1698 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
1702 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
1704 xdp_qp = nr_cpu_ids;
1706 /* XDP requires extra queues for XDP_TX */
1707 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
1708 netdev_warn(dev, "request %i queues but max is %i\n",
1709 curr_qp + xdp_qp, vi->max_queue_pairs);
1713 err = virtnet_set_queues(vi, curr_qp + xdp_qp);
1715 dev_warn(&dev->dev, "XDP Device queue allocation failure.\n");
1720 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1);
1722 virtnet_set_queues(vi, curr_qp);
1723 return PTR_ERR(prog);
1727 vi->xdp_queue_pairs = xdp_qp;
1728 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
1730 for (i = 0; i < vi->max_queue_pairs; i++) {
1731 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
1732 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
1734 bpf_prog_put(old_prog);
1740 static bool virtnet_xdp_query(struct net_device *dev)
1742 struct virtnet_info *vi = netdev_priv(dev);
1745 for (i = 0; i < vi->max_queue_pairs; i++) {
1746 if (vi->rq[i].xdp_prog)
1752 static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp)
1754 switch (xdp->command) {
1755 case XDP_SETUP_PROG:
1756 return virtnet_xdp_set(dev, xdp->prog);
1757 case XDP_QUERY_PROG:
1758 xdp->prog_attached = virtnet_xdp_query(dev);
1765 static const struct net_device_ops virtnet_netdev = {
1766 .ndo_open = virtnet_open,
1767 .ndo_stop = virtnet_close,
1768 .ndo_start_xmit = start_xmit,
1769 .ndo_validate_addr = eth_validate_addr,
1770 .ndo_set_mac_address = virtnet_set_mac_address,
1771 .ndo_set_rx_mode = virtnet_set_rx_mode,
1772 .ndo_get_stats64 = virtnet_stats,
1773 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1774 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1775 #ifdef CONFIG_NET_POLL_CONTROLLER
1776 .ndo_poll_controller = virtnet_netpoll,
1778 #ifdef CONFIG_NET_RX_BUSY_POLL
1779 .ndo_busy_poll = virtnet_busy_poll,
1781 .ndo_xdp = virtnet_xdp,
1784 static void virtnet_config_changed_work(struct work_struct *work)
1786 struct virtnet_info *vi =
1787 container_of(work, struct virtnet_info, config_work);
1790 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
1791 struct virtio_net_config, status, &v) < 0)
1794 if (v & VIRTIO_NET_S_ANNOUNCE) {
1795 netdev_notify_peers(vi->dev);
1796 virtnet_ack_link_announce(vi);
1799 /* Ignore unknown (future) status bits */
1800 v &= VIRTIO_NET_S_LINK_UP;
1802 if (vi->status == v)
1807 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1808 netif_carrier_on(vi->dev);
1809 netif_tx_wake_all_queues(vi->dev);
1811 netif_carrier_off(vi->dev);
1812 netif_tx_stop_all_queues(vi->dev);
1816 static void virtnet_config_changed(struct virtio_device *vdev)
1818 struct virtnet_info *vi = vdev->priv;
1820 schedule_work(&vi->config_work);
1823 static void virtnet_free_queues(struct virtnet_info *vi)
1827 for (i = 0; i < vi->max_queue_pairs; i++) {
1828 napi_hash_del(&vi->rq[i].napi);
1829 netif_napi_del(&vi->rq[i].napi);
1832 /* We called napi_hash_del() before netif_napi_del(),
1833 * we need to respect an RCU grace period before freeing vi->rq
1841 static void free_receive_bufs(struct virtnet_info *vi)
1843 struct bpf_prog *old_prog;
1847 for (i = 0; i < vi->max_queue_pairs; i++) {
1848 while (vi->rq[i].pages)
1849 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1851 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
1852 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
1854 bpf_prog_put(old_prog);
1859 static void free_receive_page_frags(struct virtnet_info *vi)
1862 for (i = 0; i < vi->max_queue_pairs; i++)
1863 if (vi->rq[i].alloc_frag.page)
1864 put_page(vi->rq[i].alloc_frag.page);
1867 static bool is_xdp_queue(struct virtnet_info *vi, int q)
1869 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1871 else if (q < vi->curr_queue_pairs)
1877 static void free_unused_bufs(struct virtnet_info *vi)
1882 for (i = 0; i < vi->max_queue_pairs; i++) {
1883 struct virtqueue *vq = vi->sq[i].vq;
1884 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1885 if (!is_xdp_queue(vi, i))
1888 put_page(virt_to_head_page(buf));
1892 for (i = 0; i < vi->max_queue_pairs; i++) {
1893 struct virtqueue *vq = vi->rq[i].vq;
1895 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1896 if (vi->mergeable_rx_bufs) {
1897 unsigned long ctx = (unsigned long)buf;
1898 void *base = mergeable_ctx_to_buf_address(ctx);
1899 put_page(virt_to_head_page(base));
1900 } else if (vi->big_packets) {
1901 give_pages(&vi->rq[i], buf);
1909 static void virtnet_del_vqs(struct virtnet_info *vi)
1911 struct virtio_device *vdev = vi->vdev;
1913 virtnet_clean_affinity(vi, -1);
1915 vdev->config->del_vqs(vdev);
1917 virtnet_free_queues(vi);
1920 static int virtnet_find_vqs(struct virtnet_info *vi)
1922 vq_callback_t **callbacks;
1923 struct virtqueue **vqs;
1928 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1929 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1930 * possible control vq.
1932 total_vqs = vi->max_queue_pairs * 2 +
1933 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1935 /* Allocate space for find_vqs parameters */
1936 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1939 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1942 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1946 /* Parameters for control virtqueue, if any */
1948 callbacks[total_vqs - 1] = NULL;
1949 names[total_vqs - 1] = "control";
1952 /* Allocate/initialize parameters for send/receive virtqueues */
1953 for (i = 0; i < vi->max_queue_pairs; i++) {
1954 callbacks[rxq2vq(i)] = skb_recv_done;
1955 callbacks[txq2vq(i)] = skb_xmit_done;
1956 sprintf(vi->rq[i].name, "input.%d", i);
1957 sprintf(vi->sq[i].name, "output.%d", i);
1958 names[rxq2vq(i)] = vi->rq[i].name;
1959 names[txq2vq(i)] = vi->sq[i].name;
1962 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1968 vi->cvq = vqs[total_vqs - 1];
1969 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1970 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1973 for (i = 0; i < vi->max_queue_pairs; i++) {
1974 vi->rq[i].vq = vqs[rxq2vq(i)];
1975 vi->sq[i].vq = vqs[txq2vq(i)];
1994 static int virtnet_alloc_queues(struct virtnet_info *vi)
1998 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
2001 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
2005 INIT_DELAYED_WORK(&vi->refill, refill_work);
2006 for (i = 0; i < vi->max_queue_pairs; i++) {
2007 vi->rq[i].pages = NULL;
2008 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2011 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2012 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2013 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2024 static int init_vqs(struct virtnet_info *vi)
2028 /* Allocate send & receive queues */
2029 ret = virtnet_alloc_queues(vi);
2033 ret = virtnet_find_vqs(vi);
2038 virtnet_set_affinity(vi);
2044 virtnet_free_queues(vi);
2050 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2051 struct rx_queue_attribute *attribute, char *buf)
2053 struct virtnet_info *vi = netdev_priv(queue->dev);
2054 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2055 struct ewma_pkt_len *avg;
2057 BUG_ON(queue_index >= vi->max_queue_pairs);
2058 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2059 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
2062 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2063 __ATTR_RO(mergeable_rx_buffer_size);
2065 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2066 &mergeable_rx_buffer_size_attribute.attr,
2070 static const struct attribute_group virtio_net_mrg_rx_group = {
2071 .name = "virtio_net",
2072 .attrs = virtio_net_mrg_rx_attrs
2076 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2078 const char *fname, const char *dname)
2080 if (!virtio_has_feature(vdev, fbit))
2083 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2089 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2090 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2092 static bool virtnet_validate_features(struct virtio_device *vdev)
2094 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2095 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2096 "VIRTIO_NET_F_CTRL_VQ") ||
2097 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2098 "VIRTIO_NET_F_CTRL_VQ") ||
2099 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2100 "VIRTIO_NET_F_CTRL_VQ") ||
2101 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2102 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2103 "VIRTIO_NET_F_CTRL_VQ"))) {
2110 #define MIN_MTU ETH_MIN_MTU
2111 #define MAX_MTU ETH_MAX_MTU
2113 static int virtnet_probe(struct virtio_device *vdev)
2116 struct net_device *dev;
2117 struct virtnet_info *vi;
2118 u16 max_queue_pairs;
2121 if (!vdev->config->get) {
2122 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2127 if (!virtnet_validate_features(vdev))
2130 /* Find if host supports multiqueue virtio_net device */
2131 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
2132 struct virtio_net_config,
2133 max_virtqueue_pairs, &max_queue_pairs);
2135 /* We need at least 2 queue's */
2136 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
2137 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
2138 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2139 max_queue_pairs = 1;
2141 /* Allocate ourselves a network device with room for our info */
2142 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
2146 /* Set up network device as normal. */
2147 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
2148 dev->netdev_ops = &virtnet_netdev;
2149 dev->features = NETIF_F_HIGHDMA;
2151 dev->ethtool_ops = &virtnet_ethtool_ops;
2152 SET_NETDEV_DEV(dev, &vdev->dev);
2154 /* Do we support "hardware" checksums? */
2155 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
2156 /* This opens up the world of extra features. */
2157 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2159 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2161 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
2162 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
2163 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
2165 /* Individual feature bits: what can host handle? */
2166 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
2167 dev->hw_features |= NETIF_F_TSO;
2168 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
2169 dev->hw_features |= NETIF_F_TSO6;
2170 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
2171 dev->hw_features |= NETIF_F_TSO_ECN;
2172 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
2173 dev->hw_features |= NETIF_F_UFO;
2175 dev->features |= NETIF_F_GSO_ROBUST;
2178 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
2179 /* (!csum && gso) case will be fixed by register_netdev() */
2181 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
2182 dev->features |= NETIF_F_RXCSUM;
2184 dev->vlan_features = dev->features;
2186 /* MTU range: 68 - 65535 */
2187 dev->min_mtu = MIN_MTU;
2188 dev->max_mtu = MAX_MTU;
2190 /* Configuration may specify what MAC to use. Otherwise random. */
2191 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
2192 virtio_cread_bytes(vdev,
2193 offsetof(struct virtio_net_config, mac),
2194 dev->dev_addr, dev->addr_len);
2196 eth_hw_addr_random(dev);
2198 /* Set up our device-specific information */
2199 vi = netdev_priv(dev);
2203 vi->stats = alloc_percpu(struct virtnet_stats);
2205 if (vi->stats == NULL)
2208 for_each_possible_cpu(i) {
2209 struct virtnet_stats *virtnet_stats;
2210 virtnet_stats = per_cpu_ptr(vi->stats, i);
2211 u64_stats_init(&virtnet_stats->tx_syncp);
2212 u64_stats_init(&virtnet_stats->rx_syncp);
2215 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
2217 /* If we can receive ANY GSO packets, we must allocate large ones. */
2218 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2219 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2220 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
2221 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
2222 vi->big_packets = true;
2224 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
2225 vi->mergeable_rx_bufs = true;
2227 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
2228 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2229 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2231 vi->hdr_len = sizeof(struct virtio_net_hdr);
2233 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
2234 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2235 vi->any_header_sg = true;
2237 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2240 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2241 mtu = virtio_cread16(vdev,
2242 offsetof(struct virtio_net_config,
2244 if (mtu < dev->min_mtu) {
2245 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2252 if (vi->any_header_sg)
2253 dev->needed_headroom = vi->hdr_len;
2255 /* Enable multiqueue by default */
2256 if (num_online_cpus() >= max_queue_pairs)
2257 vi->curr_queue_pairs = max_queue_pairs;
2259 vi->curr_queue_pairs = num_online_cpus();
2260 vi->max_queue_pairs = max_queue_pairs;
2262 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
2268 if (vi->mergeable_rx_bufs)
2269 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
2271 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
2272 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
2274 virtnet_init_settings(dev);
2276 err = register_netdev(dev);
2278 pr_debug("virtio_net: registering device failed\n");
2282 virtio_device_ready(vdev);
2284 err = virtnet_cpu_notif_add(vi);
2286 pr_debug("virtio_net: registering cpu notifier failed\n");
2287 goto free_unregister_netdev;
2291 virtnet_set_queues(vi, vi->curr_queue_pairs);
2294 /* Assume link up if device can't report link status,
2295 otherwise get link status from config. */
2296 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
2297 netif_carrier_off(dev);
2298 schedule_work(&vi->config_work);
2300 vi->status = VIRTIO_NET_S_LINK_UP;
2301 netif_carrier_on(dev);
2304 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
2305 dev->name, max_queue_pairs);
2309 free_unregister_netdev:
2310 vi->vdev->config->reset(vdev);
2312 unregister_netdev(dev);
2314 cancel_delayed_work_sync(&vi->refill);
2315 free_receive_page_frags(vi);
2316 virtnet_del_vqs(vi);
2318 free_percpu(vi->stats);
2324 static void remove_vq_common(struct virtnet_info *vi)
2326 vi->vdev->config->reset(vi->vdev);
2328 /* Free unused buffers in both send and recv, if any. */
2329 free_unused_bufs(vi);
2331 free_receive_bufs(vi);
2333 free_receive_page_frags(vi);
2335 virtnet_del_vqs(vi);
2338 static void virtnet_remove(struct virtio_device *vdev)
2340 struct virtnet_info *vi = vdev->priv;
2342 virtnet_cpu_notif_remove(vi);
2344 /* Make sure no work handler is accessing the device. */
2345 flush_work(&vi->config_work);
2347 unregister_netdev(vi->dev);
2349 remove_vq_common(vi);
2351 free_percpu(vi->stats);
2352 free_netdev(vi->dev);
2355 #ifdef CONFIG_PM_SLEEP
2356 static int virtnet_freeze(struct virtio_device *vdev)
2358 struct virtnet_info *vi = vdev->priv;
2361 virtnet_cpu_notif_remove(vi);
2363 /* Make sure no work handler is accessing the device */
2364 flush_work(&vi->config_work);
2366 netif_device_detach(vi->dev);
2367 cancel_delayed_work_sync(&vi->refill);
2369 if (netif_running(vi->dev)) {
2370 for (i = 0; i < vi->max_queue_pairs; i++)
2371 napi_disable(&vi->rq[i].napi);
2374 remove_vq_common(vi);
2379 static int virtnet_restore(struct virtio_device *vdev)
2381 struct virtnet_info *vi = vdev->priv;
2388 virtio_device_ready(vdev);
2390 if (netif_running(vi->dev)) {
2391 for (i = 0; i < vi->curr_queue_pairs; i++)
2392 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2393 schedule_delayed_work(&vi->refill, 0);
2395 for (i = 0; i < vi->max_queue_pairs; i++)
2396 virtnet_napi_enable(&vi->rq[i]);
2399 netif_device_attach(vi->dev);
2402 virtnet_set_queues(vi, vi->curr_queue_pairs);
2405 err = virtnet_cpu_notif_add(vi);
2413 static struct virtio_device_id id_table[] = {
2414 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
2418 #define VIRTNET_FEATURES \
2419 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
2421 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
2422 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
2423 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
2424 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
2425 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
2426 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
2427 VIRTIO_NET_F_CTRL_MAC_ADDR, \
2430 static unsigned int features[] = {
2434 static unsigned int features_legacy[] = {
2437 VIRTIO_F_ANY_LAYOUT,
2440 static struct virtio_driver virtio_net_driver = {
2441 .feature_table = features,
2442 .feature_table_size = ARRAY_SIZE(features),
2443 .feature_table_legacy = features_legacy,
2444 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
2445 .driver.name = KBUILD_MODNAME,
2446 .driver.owner = THIS_MODULE,
2447 .id_table = id_table,
2448 .probe = virtnet_probe,
2449 .remove = virtnet_remove,
2450 .config_changed = virtnet_config_changed,
2451 #ifdef CONFIG_PM_SLEEP
2452 .freeze = virtnet_freeze,
2453 .restore = virtnet_restore,
2457 static __init int virtio_net_driver_init(void)
2461 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "AP_VIRT_NET_ONLINE",
2463 virtnet_cpu_down_prep);
2466 virtionet_online = ret;
2467 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "VIRT_NET_DEAD",
2468 NULL, virtnet_cpu_dead);
2472 ret = register_virtio_driver(&virtio_net_driver);
2477 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
2479 cpuhp_remove_multi_state(virtionet_online);
2483 module_init(virtio_net_driver_init);
2485 static __exit void virtio_net_driver_exit(void)
2487 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
2488 cpuhp_remove_multi_state(virtionet_online);
2489 unregister_virtio_driver(&virtio_net_driver);
2491 module_exit(virtio_net_driver_exit);
2493 MODULE_DEVICE_TABLE(virtio, id_table);
2494 MODULE_DESCRIPTION("Virtio network driver");
2495 MODULE_LICENSE("GPL");