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,
591 if (unlikely(xdp_page != page))
597 if (unlikely(xdp_page != page))
598 __free_pages(xdp_page, 0);
604 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
605 head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
608 if (unlikely(!curr_skb))
613 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
614 if (unlikely(!ctx)) {
615 pr_debug("%s: rx error: %d buffers out of %d missing\n",
617 virtio16_to_cpu(vi->vdev,
619 dev->stats.rx_length_errors++;
623 buf = mergeable_ctx_to_buf_address(ctx);
624 page = virt_to_head_page(buf);
626 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
627 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
628 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
632 if (curr_skb == head_skb)
633 skb_shinfo(curr_skb)->frag_list = nskb;
635 curr_skb->next = nskb;
637 head_skb->truesize += nskb->truesize;
640 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
641 if (curr_skb != head_skb) {
642 head_skb->data_len += len;
643 head_skb->len += len;
644 head_skb->truesize += truesize;
646 offset = buf - page_address(page);
647 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
649 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
652 skb_add_rx_frag(curr_skb, num_skb_frags, page,
653 offset, len, truesize);
657 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
665 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
666 if (unlikely(!ctx)) {
667 pr_debug("%s: rx error: %d buffers missing\n",
669 dev->stats.rx_length_errors++;
672 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
676 dev->stats.rx_dropped++;
677 dev_kfree_skb(head_skb);
682 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
683 void *buf, unsigned int len)
685 struct net_device *dev = vi->dev;
686 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
688 struct virtio_net_hdr_mrg_rxbuf *hdr;
690 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
691 pr_debug("%s: short packet %i\n", dev->name, len);
692 dev->stats.rx_length_errors++;
693 if (vi->mergeable_rx_bufs) {
694 unsigned long ctx = (unsigned long)buf;
695 void *base = mergeable_ctx_to_buf_address(ctx);
696 put_page(virt_to_head_page(base));
697 } else if (vi->big_packets) {
705 if (vi->mergeable_rx_bufs)
706 skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
707 else if (vi->big_packets)
708 skb = receive_big(dev, vi, rq, buf, len);
710 skb = receive_small(vi, buf, len);
715 hdr = skb_vnet_hdr(skb);
717 u64_stats_update_begin(&stats->rx_syncp);
718 stats->rx_bytes += skb->len;
720 u64_stats_update_end(&stats->rx_syncp);
722 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
723 skb->ip_summed = CHECKSUM_UNNECESSARY;
725 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
726 virtio_is_little_endian(vi->vdev))) {
727 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
728 dev->name, hdr->hdr.gso_type,
733 skb->protocol = eth_type_trans(skb, dev);
734 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
735 ntohs(skb->protocol), skb->len, skb->pkt_type);
737 napi_gro_receive(&rq->napi, skb);
741 dev->stats.rx_frame_errors++;
745 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
749 struct virtio_net_hdr_mrg_rxbuf *hdr;
752 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
756 skb_put(skb, GOOD_PACKET_LEN);
758 hdr = skb_vnet_hdr(skb);
759 sg_init_table(rq->sg, 2);
760 sg_set_buf(rq->sg, hdr, vi->hdr_len);
761 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
763 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
770 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
773 struct page *first, *list = NULL;
777 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
779 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
780 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
781 first = get_a_page(rq, gfp);
784 give_pages(rq, list);
787 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
789 /* chain new page in list head to match sg */
790 first->private = (unsigned long)list;
794 first = get_a_page(rq, gfp);
796 give_pages(rq, list);
799 p = page_address(first);
801 /* rq->sg[0], rq->sg[1] share the same page */
802 /* a separated rq->sg[0] for header - required in case !any_header_sg */
803 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
805 /* rq->sg[1] for data packet, from offset */
806 offset = sizeof(struct padded_vnet_hdr);
807 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
809 /* chain first in list head */
810 first->private = (unsigned long)list;
811 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
814 give_pages(rq, first);
819 static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len)
821 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
824 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
825 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
826 return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
829 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
831 struct page_frag *alloc_frag = &rq->alloc_frag;
835 unsigned int len, hole;
837 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
838 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
841 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
842 ctx = mergeable_buf_to_ctx(buf, len);
843 get_page(alloc_frag->page);
844 alloc_frag->offset += len;
845 hole = alloc_frag->size - alloc_frag->offset;
847 /* To avoid internal fragmentation, if there is very likely not
848 * enough space for another buffer, add the remaining space to
849 * the current buffer. This extra space is not included in
850 * the truesize stored in ctx.
853 alloc_frag->offset += hole;
856 sg_init_one(rq->sg, buf, len);
857 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
859 put_page(virt_to_head_page(buf));
865 * Returns false if we couldn't fill entirely (OOM).
867 * Normally run in the receive path, but can also be run from ndo_open
868 * before we're receiving packets, or from refill_work which is
869 * careful to disable receiving (using napi_disable).
871 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
879 if (vi->mergeable_rx_bufs)
880 err = add_recvbuf_mergeable(rq, gfp);
881 else if (vi->big_packets)
882 err = add_recvbuf_big(vi, rq, gfp);
884 err = add_recvbuf_small(vi, rq, gfp);
886 oom = err == -ENOMEM;
889 } while (rq->vq->num_free);
890 virtqueue_kick(rq->vq);
894 static void skb_recv_done(struct virtqueue *rvq)
896 struct virtnet_info *vi = rvq->vdev->priv;
897 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
899 /* Schedule NAPI, Suppress further interrupts if successful. */
900 if (napi_schedule_prep(&rq->napi)) {
901 virtqueue_disable_cb(rvq);
902 __napi_schedule(&rq->napi);
906 static void virtnet_napi_enable(struct receive_queue *rq)
908 napi_enable(&rq->napi);
910 /* If all buffers were filled by other side before we napi_enabled, we
911 * won't get another interrupt, so process any outstanding packets
912 * now. virtnet_poll wants re-enable the queue, so we disable here.
913 * We synchronize against interrupts via NAPI_STATE_SCHED */
914 if (napi_schedule_prep(&rq->napi)) {
915 virtqueue_disable_cb(rq->vq);
917 __napi_schedule(&rq->napi);
922 static void refill_work(struct work_struct *work)
924 struct virtnet_info *vi =
925 container_of(work, struct virtnet_info, refill.work);
929 for (i = 0; i < vi->curr_queue_pairs; i++) {
930 struct receive_queue *rq = &vi->rq[i];
932 napi_disable(&rq->napi);
933 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
934 virtnet_napi_enable(rq);
936 /* In theory, this can happen: if we don't get any buffers in
937 * we will *never* try to fill again.
940 schedule_delayed_work(&vi->refill, HZ/2);
944 static int virtnet_receive(struct receive_queue *rq, int budget)
946 struct virtnet_info *vi = rq->vq->vdev->priv;
947 unsigned int len, received = 0;
950 while (received < budget &&
951 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
952 receive_buf(vi, rq, buf, len);
956 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
957 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
958 schedule_delayed_work(&vi->refill, 0);
964 static int virtnet_poll(struct napi_struct *napi, int budget)
966 struct receive_queue *rq =
967 container_of(napi, struct receive_queue, napi);
968 unsigned int r, received;
970 received = virtnet_receive(rq, budget);
972 /* Out of packets? */
973 if (received < budget) {
974 r = virtqueue_enable_cb_prepare(rq->vq);
975 napi_complete_done(napi, received);
976 if (unlikely(virtqueue_poll(rq->vq, r)) &&
977 napi_schedule_prep(napi)) {
978 virtqueue_disable_cb(rq->vq);
979 __napi_schedule(napi);
986 #ifdef CONFIG_NET_RX_BUSY_POLL
987 /* must be called with local_bh_disable()d */
988 static int virtnet_busy_poll(struct napi_struct *napi)
990 struct receive_queue *rq =
991 container_of(napi, struct receive_queue, napi);
992 struct virtnet_info *vi = rq->vq->vdev->priv;
993 int r, received = 0, budget = 4;
995 if (!(vi->status & VIRTIO_NET_S_LINK_UP))
996 return LL_FLUSH_FAILED;
998 if (!napi_schedule_prep(napi))
999 return LL_FLUSH_BUSY;
1001 virtqueue_disable_cb(rq->vq);
1004 received += virtnet_receive(rq, budget);
1006 r = virtqueue_enable_cb_prepare(rq->vq);
1007 clear_bit(NAPI_STATE_SCHED, &napi->state);
1008 if (unlikely(virtqueue_poll(rq->vq, r)) &&
1009 napi_schedule_prep(napi)) {
1010 virtqueue_disable_cb(rq->vq);
1011 if (received < budget) {
1015 __napi_schedule(napi);
1021 #endif /* CONFIG_NET_RX_BUSY_POLL */
1023 static int virtnet_open(struct net_device *dev)
1025 struct virtnet_info *vi = netdev_priv(dev);
1028 for (i = 0; i < vi->max_queue_pairs; i++) {
1029 if (i < vi->curr_queue_pairs)
1030 /* Make sure we have some buffers: if oom use wq. */
1031 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1032 schedule_delayed_work(&vi->refill, 0);
1033 virtnet_napi_enable(&vi->rq[i]);
1039 static void free_old_xmit_skbs(struct send_queue *sq)
1041 struct sk_buff *skb;
1043 struct virtnet_info *vi = sq->vq->vdev->priv;
1044 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
1046 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1047 pr_debug("Sent skb %p\n", skb);
1049 u64_stats_update_begin(&stats->tx_syncp);
1050 stats->tx_bytes += skb->len;
1051 stats->tx_packets++;
1052 u64_stats_update_end(&stats->tx_syncp);
1054 dev_kfree_skb_any(skb);
1058 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1060 struct virtio_net_hdr_mrg_rxbuf *hdr;
1061 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1062 struct virtnet_info *vi = sq->vq->vdev->priv;
1064 unsigned hdr_len = vi->hdr_len;
1067 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1069 can_push = vi->any_header_sg &&
1070 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1071 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1072 /* Even if we can, don't push here yet as this would skew
1073 * csum_start offset below. */
1075 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1077 hdr = skb_vnet_hdr(skb);
1079 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1080 virtio_is_little_endian(vi->vdev)))
1083 if (vi->mergeable_rx_bufs)
1084 hdr->num_buffers = 0;
1086 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1088 __skb_push(skb, hdr_len);
1089 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1090 /* Pull header back to avoid skew in tx bytes calculations. */
1091 __skb_pull(skb, hdr_len);
1093 sg_set_buf(sq->sg, hdr, hdr_len);
1094 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
1096 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1099 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1101 struct virtnet_info *vi = netdev_priv(dev);
1102 int qnum = skb_get_queue_mapping(skb);
1103 struct send_queue *sq = &vi->sq[qnum];
1105 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1106 bool kick = !skb->xmit_more;
1108 /* Free up any pending old buffers before queueing new ones. */
1109 free_old_xmit_skbs(sq);
1111 /* timestamp packet in software */
1112 skb_tx_timestamp(skb);
1114 /* Try to transmit */
1115 err = xmit_skb(sq, skb);
1117 /* This should not happen! */
1118 if (unlikely(err)) {
1119 dev->stats.tx_fifo_errors++;
1120 if (net_ratelimit())
1122 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
1123 dev->stats.tx_dropped++;
1124 dev_kfree_skb_any(skb);
1125 return NETDEV_TX_OK;
1128 /* Don't wait up for transmitted skbs to be freed. */
1132 /* If running out of space, stop queue to avoid getting packets that we
1133 * are then unable to transmit.
1134 * An alternative would be to force queuing layer to requeue the skb by
1135 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1136 * returned in a normal path of operation: it means that driver is not
1137 * maintaining the TX queue stop/start state properly, and causes
1138 * the stack to do a non-trivial amount of useless work.
1139 * Since most packets only take 1 or 2 ring slots, stopping the queue
1140 * early means 16 slots are typically wasted.
1142 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1143 netif_stop_subqueue(dev, qnum);
1144 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1145 /* More just got used, free them then recheck. */
1146 free_old_xmit_skbs(sq);
1147 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1148 netif_start_subqueue(dev, qnum);
1149 virtqueue_disable_cb(sq->vq);
1154 if (kick || netif_xmit_stopped(txq))
1155 virtqueue_kick(sq->vq);
1157 return NETDEV_TX_OK;
1161 * Send command via the control virtqueue and check status. Commands
1162 * supported by the hypervisor, as indicated by feature bits, should
1163 * never fail unless improperly formatted.
1165 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1166 struct scatterlist *out)
1168 struct scatterlist *sgs[4], hdr, stat;
1169 unsigned out_num = 0, tmp;
1171 /* Caller should know better */
1172 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1174 vi->ctrl_status = ~0;
1175 vi->ctrl_hdr.class = class;
1176 vi->ctrl_hdr.cmd = cmd;
1178 sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr));
1179 sgs[out_num++] = &hdr;
1182 sgs[out_num++] = out;
1184 /* Add return status. */
1185 sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status));
1186 sgs[out_num] = &stat;
1188 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1189 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1191 if (unlikely(!virtqueue_kick(vi->cvq)))
1192 return vi->ctrl_status == VIRTIO_NET_OK;
1194 /* Spin for a response, the kick causes an ioport write, trapping
1195 * into the hypervisor, so the request should be handled immediately.
1197 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1198 !virtqueue_is_broken(vi->cvq))
1201 return vi->ctrl_status == VIRTIO_NET_OK;
1204 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1206 struct virtnet_info *vi = netdev_priv(dev);
1207 struct virtio_device *vdev = vi->vdev;
1209 struct sockaddr *addr;
1210 struct scatterlist sg;
1212 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
1215 memcpy(addr, p, sizeof(*addr));
1217 ret = eth_prepare_mac_addr_change(dev, addr);
1221 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1222 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1223 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1224 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1225 dev_warn(&vdev->dev,
1226 "Failed to set mac address by vq command.\n");
1230 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1231 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1234 /* Naturally, this has an atomicity problem. */
1235 for (i = 0; i < dev->addr_len; i++)
1236 virtio_cwrite8(vdev,
1237 offsetof(struct virtio_net_config, mac) +
1238 i, addr->sa_data[i]);
1241 eth_commit_mac_addr_change(dev, p);
1249 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
1250 struct rtnl_link_stats64 *tot)
1252 struct virtnet_info *vi = netdev_priv(dev);
1256 for_each_possible_cpu(cpu) {
1257 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
1258 u64 tpackets, tbytes, rpackets, rbytes;
1261 start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
1262 tpackets = stats->tx_packets;
1263 tbytes = stats->tx_bytes;
1264 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
1267 start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
1268 rpackets = stats->rx_packets;
1269 rbytes = stats->rx_bytes;
1270 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
1272 tot->rx_packets += rpackets;
1273 tot->tx_packets += tpackets;
1274 tot->rx_bytes += rbytes;
1275 tot->tx_bytes += tbytes;
1278 tot->tx_dropped = dev->stats.tx_dropped;
1279 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1280 tot->rx_dropped = dev->stats.rx_dropped;
1281 tot->rx_length_errors = dev->stats.rx_length_errors;
1282 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1287 #ifdef CONFIG_NET_POLL_CONTROLLER
1288 static void virtnet_netpoll(struct net_device *dev)
1290 struct virtnet_info *vi = netdev_priv(dev);
1293 for (i = 0; i < vi->curr_queue_pairs; i++)
1294 napi_schedule(&vi->rq[i].napi);
1298 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1301 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1302 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1303 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1307 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1309 struct scatterlist sg;
1310 struct net_device *dev = vi->dev;
1312 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1315 vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1316 sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq));
1318 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1319 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1320 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1324 vi->curr_queue_pairs = queue_pairs;
1325 /* virtnet_open() will refill when device is going to up. */
1326 if (dev->flags & IFF_UP)
1327 schedule_delayed_work(&vi->refill, 0);
1333 static int virtnet_close(struct net_device *dev)
1335 struct virtnet_info *vi = netdev_priv(dev);
1338 /* Make sure refill_work doesn't re-enable napi! */
1339 cancel_delayed_work_sync(&vi->refill);
1341 for (i = 0; i < vi->max_queue_pairs; i++)
1342 napi_disable(&vi->rq[i].napi);
1347 static void virtnet_set_rx_mode(struct net_device *dev)
1349 struct virtnet_info *vi = netdev_priv(dev);
1350 struct scatterlist sg[2];
1351 struct virtio_net_ctrl_mac *mac_data;
1352 struct netdev_hw_addr *ha;
1358 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1359 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1362 vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0);
1363 vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1365 sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc));
1367 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1368 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1369 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1370 vi->ctrl_promisc ? "en" : "dis");
1372 sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti));
1374 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1375 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1376 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1377 vi->ctrl_allmulti ? "en" : "dis");
1379 uc_count = netdev_uc_count(dev);
1380 mc_count = netdev_mc_count(dev);
1381 /* MAC filter - use one buffer for both lists */
1382 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1383 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1388 sg_init_table(sg, 2);
1390 /* Store the unicast list and count in the front of the buffer */
1391 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1393 netdev_for_each_uc_addr(ha, dev)
1394 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1396 sg_set_buf(&sg[0], mac_data,
1397 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1399 /* multicast list and count fill the end */
1400 mac_data = (void *)&mac_data->macs[uc_count][0];
1402 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1404 netdev_for_each_mc_addr(ha, dev)
1405 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1407 sg_set_buf(&sg[1], mac_data,
1408 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1410 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1411 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1412 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1417 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1418 __be16 proto, u16 vid)
1420 struct virtnet_info *vi = netdev_priv(dev);
1421 struct scatterlist sg;
1424 sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid));
1426 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1427 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1428 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1432 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1433 __be16 proto, u16 vid)
1435 struct virtnet_info *vi = netdev_priv(dev);
1436 struct scatterlist sg;
1439 sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid));
1441 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1442 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1443 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1447 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1451 if (vi->affinity_hint_set) {
1452 for (i = 0; i < vi->max_queue_pairs; i++) {
1453 virtqueue_set_affinity(vi->rq[i].vq, -1);
1454 virtqueue_set_affinity(vi->sq[i].vq, -1);
1457 vi->affinity_hint_set = false;
1461 static void virtnet_set_affinity(struct virtnet_info *vi)
1466 /* In multiqueue mode, when the number of cpu is equal to the number of
1467 * queue pairs, we let the queue pairs to be private to one cpu by
1468 * setting the affinity hint to eliminate the contention.
1470 if (vi->curr_queue_pairs == 1 ||
1471 vi->max_queue_pairs != num_online_cpus()) {
1472 virtnet_clean_affinity(vi, -1);
1477 for_each_online_cpu(cpu) {
1478 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1479 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1480 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
1484 vi->affinity_hint_set = true;
1487 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
1489 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1491 virtnet_set_affinity(vi);
1495 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
1497 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1499 virtnet_set_affinity(vi);
1503 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
1505 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
1508 virtnet_clean_affinity(vi, cpu);
1512 static enum cpuhp_state virtionet_online;
1514 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
1518 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
1521 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1525 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1529 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
1531 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
1532 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
1536 static void virtnet_get_ringparam(struct net_device *dev,
1537 struct ethtool_ringparam *ring)
1539 struct virtnet_info *vi = netdev_priv(dev);
1541 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1542 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1543 ring->rx_pending = ring->rx_max_pending;
1544 ring->tx_pending = ring->tx_max_pending;
1548 static void virtnet_get_drvinfo(struct net_device *dev,
1549 struct ethtool_drvinfo *info)
1551 struct virtnet_info *vi = netdev_priv(dev);
1552 struct virtio_device *vdev = vi->vdev;
1554 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1555 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1556 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1560 /* TODO: Eliminate OOO packets during switching */
1561 static int virtnet_set_channels(struct net_device *dev,
1562 struct ethtool_channels *channels)
1564 struct virtnet_info *vi = netdev_priv(dev);
1565 u16 queue_pairs = channels->combined_count;
1568 /* We don't support separate rx/tx channels.
1569 * We don't allow setting 'other' channels.
1571 if (channels->rx_count || channels->tx_count || channels->other_count)
1574 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
1577 /* For now we don't support modifying channels while XDP is loaded
1578 * also when XDP is loaded all RX queues have XDP programs so we only
1579 * need to check a single RX queue.
1581 if (vi->rq[0].xdp_prog)
1585 err = virtnet_set_queues(vi, queue_pairs);
1587 netif_set_real_num_tx_queues(dev, queue_pairs);
1588 netif_set_real_num_rx_queues(dev, queue_pairs);
1590 virtnet_set_affinity(vi);
1597 static void virtnet_get_channels(struct net_device *dev,
1598 struct ethtool_channels *channels)
1600 struct virtnet_info *vi = netdev_priv(dev);
1602 channels->combined_count = vi->curr_queue_pairs;
1603 channels->max_combined = vi->max_queue_pairs;
1604 channels->max_other = 0;
1605 channels->rx_count = 0;
1606 channels->tx_count = 0;
1607 channels->other_count = 0;
1610 /* Check if the user is trying to change anything besides speed/duplex */
1611 static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd)
1613 struct ethtool_cmd diff1 = *cmd;
1614 struct ethtool_cmd diff2 = {};
1616 /* cmd is always set so we need to clear it, validate the port type
1617 * and also without autonegotiation we can ignore advertising
1619 ethtool_cmd_speed_set(&diff1, 0);
1620 diff2.port = PORT_OTHER;
1621 diff1.advertising = 0;
1625 return !memcmp(&diff1, &diff2, sizeof(diff1));
1628 static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1630 struct virtnet_info *vi = netdev_priv(dev);
1633 speed = ethtool_cmd_speed(cmd);
1634 /* don't allow custom speed and duplex */
1635 if (!ethtool_validate_speed(speed) ||
1636 !ethtool_validate_duplex(cmd->duplex) ||
1637 !virtnet_validate_ethtool_cmd(cmd))
1640 vi->duplex = cmd->duplex;
1645 static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1647 struct virtnet_info *vi = netdev_priv(dev);
1649 ethtool_cmd_speed_set(cmd, vi->speed);
1650 cmd->duplex = vi->duplex;
1651 cmd->port = PORT_OTHER;
1656 static void virtnet_init_settings(struct net_device *dev)
1658 struct virtnet_info *vi = netdev_priv(dev);
1660 vi->speed = SPEED_UNKNOWN;
1661 vi->duplex = DUPLEX_UNKNOWN;
1664 static const struct ethtool_ops virtnet_ethtool_ops = {
1665 .get_drvinfo = virtnet_get_drvinfo,
1666 .get_link = ethtool_op_get_link,
1667 .get_ringparam = virtnet_get_ringparam,
1668 .set_channels = virtnet_set_channels,
1669 .get_channels = virtnet_get_channels,
1670 .get_ts_info = ethtool_op_get_ts_info,
1671 .get_settings = virtnet_get_settings,
1672 .set_settings = virtnet_set_settings,
1675 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog)
1677 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
1678 struct virtnet_info *vi = netdev_priv(dev);
1679 struct bpf_prog *old_prog;
1680 u16 xdp_qp = 0, curr_qp;
1683 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1684 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6)) {
1685 netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n");
1689 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
1690 netdev_warn(dev, "XDP expects header/data in single page, any_header_sg required\n");
1694 if (dev->mtu > max_sz) {
1695 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
1699 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
1701 xdp_qp = nr_cpu_ids;
1703 /* XDP requires extra queues for XDP_TX */
1704 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
1705 netdev_warn(dev, "request %i queues but max is %i\n",
1706 curr_qp + xdp_qp, vi->max_queue_pairs);
1710 err = virtnet_set_queues(vi, curr_qp + xdp_qp);
1712 dev_warn(&dev->dev, "XDP Device queue allocation failure.\n");
1717 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1);
1719 virtnet_set_queues(vi, curr_qp);
1720 return PTR_ERR(prog);
1724 vi->xdp_queue_pairs = xdp_qp;
1725 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
1727 for (i = 0; i < vi->max_queue_pairs; i++) {
1728 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
1729 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
1731 bpf_prog_put(old_prog);
1737 static bool virtnet_xdp_query(struct net_device *dev)
1739 struct virtnet_info *vi = netdev_priv(dev);
1742 for (i = 0; i < vi->max_queue_pairs; i++) {
1743 if (vi->rq[i].xdp_prog)
1749 static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp)
1751 switch (xdp->command) {
1752 case XDP_SETUP_PROG:
1753 return virtnet_xdp_set(dev, xdp->prog);
1754 case XDP_QUERY_PROG:
1755 xdp->prog_attached = virtnet_xdp_query(dev);
1762 static const struct net_device_ops virtnet_netdev = {
1763 .ndo_open = virtnet_open,
1764 .ndo_stop = virtnet_close,
1765 .ndo_start_xmit = start_xmit,
1766 .ndo_validate_addr = eth_validate_addr,
1767 .ndo_set_mac_address = virtnet_set_mac_address,
1768 .ndo_set_rx_mode = virtnet_set_rx_mode,
1769 .ndo_get_stats64 = virtnet_stats,
1770 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1771 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1772 #ifdef CONFIG_NET_POLL_CONTROLLER
1773 .ndo_poll_controller = virtnet_netpoll,
1775 #ifdef CONFIG_NET_RX_BUSY_POLL
1776 .ndo_busy_poll = virtnet_busy_poll,
1778 .ndo_xdp = virtnet_xdp,
1781 static void virtnet_config_changed_work(struct work_struct *work)
1783 struct virtnet_info *vi =
1784 container_of(work, struct virtnet_info, config_work);
1787 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
1788 struct virtio_net_config, status, &v) < 0)
1791 if (v & VIRTIO_NET_S_ANNOUNCE) {
1792 netdev_notify_peers(vi->dev);
1793 virtnet_ack_link_announce(vi);
1796 /* Ignore unknown (future) status bits */
1797 v &= VIRTIO_NET_S_LINK_UP;
1799 if (vi->status == v)
1804 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1805 netif_carrier_on(vi->dev);
1806 netif_tx_wake_all_queues(vi->dev);
1808 netif_carrier_off(vi->dev);
1809 netif_tx_stop_all_queues(vi->dev);
1813 static void virtnet_config_changed(struct virtio_device *vdev)
1815 struct virtnet_info *vi = vdev->priv;
1817 schedule_work(&vi->config_work);
1820 static void virtnet_free_queues(struct virtnet_info *vi)
1824 for (i = 0; i < vi->max_queue_pairs; i++) {
1825 napi_hash_del(&vi->rq[i].napi);
1826 netif_napi_del(&vi->rq[i].napi);
1829 /* We called napi_hash_del() before netif_napi_del(),
1830 * we need to respect an RCU grace period before freeing vi->rq
1838 static void free_receive_bufs(struct virtnet_info *vi)
1840 struct bpf_prog *old_prog;
1844 for (i = 0; i < vi->max_queue_pairs; i++) {
1845 while (vi->rq[i].pages)
1846 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1848 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
1849 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
1851 bpf_prog_put(old_prog);
1856 static void free_receive_page_frags(struct virtnet_info *vi)
1859 for (i = 0; i < vi->max_queue_pairs; i++)
1860 if (vi->rq[i].alloc_frag.page)
1861 put_page(vi->rq[i].alloc_frag.page);
1864 static bool is_xdp_queue(struct virtnet_info *vi, int q)
1866 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1868 else if (q < vi->curr_queue_pairs)
1874 static void free_unused_bufs(struct virtnet_info *vi)
1879 for (i = 0; i < vi->max_queue_pairs; i++) {
1880 struct virtqueue *vq = vi->sq[i].vq;
1881 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1882 if (!is_xdp_queue(vi, i))
1885 put_page(virt_to_head_page(buf));
1889 for (i = 0; i < vi->max_queue_pairs; i++) {
1890 struct virtqueue *vq = vi->rq[i].vq;
1892 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1893 if (vi->mergeable_rx_bufs) {
1894 unsigned long ctx = (unsigned long)buf;
1895 void *base = mergeable_ctx_to_buf_address(ctx);
1896 put_page(virt_to_head_page(base));
1897 } else if (vi->big_packets) {
1898 give_pages(&vi->rq[i], buf);
1906 static void virtnet_del_vqs(struct virtnet_info *vi)
1908 struct virtio_device *vdev = vi->vdev;
1910 virtnet_clean_affinity(vi, -1);
1912 vdev->config->del_vqs(vdev);
1914 virtnet_free_queues(vi);
1917 static int virtnet_find_vqs(struct virtnet_info *vi)
1919 vq_callback_t **callbacks;
1920 struct virtqueue **vqs;
1925 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1926 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1927 * possible control vq.
1929 total_vqs = vi->max_queue_pairs * 2 +
1930 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1932 /* Allocate space for find_vqs parameters */
1933 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1936 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1939 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1943 /* Parameters for control virtqueue, if any */
1945 callbacks[total_vqs - 1] = NULL;
1946 names[total_vqs - 1] = "control";
1949 /* Allocate/initialize parameters for send/receive virtqueues */
1950 for (i = 0; i < vi->max_queue_pairs; i++) {
1951 callbacks[rxq2vq(i)] = skb_recv_done;
1952 callbacks[txq2vq(i)] = skb_xmit_done;
1953 sprintf(vi->rq[i].name, "input.%d", i);
1954 sprintf(vi->sq[i].name, "output.%d", i);
1955 names[rxq2vq(i)] = vi->rq[i].name;
1956 names[txq2vq(i)] = vi->sq[i].name;
1959 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1965 vi->cvq = vqs[total_vqs - 1];
1966 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1967 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1970 for (i = 0; i < vi->max_queue_pairs; i++) {
1971 vi->rq[i].vq = vqs[rxq2vq(i)];
1972 vi->sq[i].vq = vqs[txq2vq(i)];
1991 static int virtnet_alloc_queues(struct virtnet_info *vi)
1995 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1998 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
2002 INIT_DELAYED_WORK(&vi->refill, refill_work);
2003 for (i = 0; i < vi->max_queue_pairs; i++) {
2004 vi->rq[i].pages = NULL;
2005 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2008 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2009 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2010 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2021 static int init_vqs(struct virtnet_info *vi)
2025 /* Allocate send & receive queues */
2026 ret = virtnet_alloc_queues(vi);
2030 ret = virtnet_find_vqs(vi);
2035 virtnet_set_affinity(vi);
2041 virtnet_free_queues(vi);
2047 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2048 struct rx_queue_attribute *attribute, char *buf)
2050 struct virtnet_info *vi = netdev_priv(queue->dev);
2051 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2052 struct ewma_pkt_len *avg;
2054 BUG_ON(queue_index >= vi->max_queue_pairs);
2055 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2056 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
2059 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2060 __ATTR_RO(mergeable_rx_buffer_size);
2062 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2063 &mergeable_rx_buffer_size_attribute.attr,
2067 static const struct attribute_group virtio_net_mrg_rx_group = {
2068 .name = "virtio_net",
2069 .attrs = virtio_net_mrg_rx_attrs
2073 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2075 const char *fname, const char *dname)
2077 if (!virtio_has_feature(vdev, fbit))
2080 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2086 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2087 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2089 static bool virtnet_validate_features(struct virtio_device *vdev)
2091 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2092 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2093 "VIRTIO_NET_F_CTRL_VQ") ||
2094 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2095 "VIRTIO_NET_F_CTRL_VQ") ||
2096 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2097 "VIRTIO_NET_F_CTRL_VQ") ||
2098 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2099 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2100 "VIRTIO_NET_F_CTRL_VQ"))) {
2107 #define MIN_MTU ETH_MIN_MTU
2108 #define MAX_MTU ETH_MAX_MTU
2110 static int virtnet_probe(struct virtio_device *vdev)
2113 struct net_device *dev;
2114 struct virtnet_info *vi;
2115 u16 max_queue_pairs;
2118 if (!vdev->config->get) {
2119 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2124 if (!virtnet_validate_features(vdev))
2127 /* Find if host supports multiqueue virtio_net device */
2128 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
2129 struct virtio_net_config,
2130 max_virtqueue_pairs, &max_queue_pairs);
2132 /* We need at least 2 queue's */
2133 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
2134 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
2135 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2136 max_queue_pairs = 1;
2138 /* Allocate ourselves a network device with room for our info */
2139 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
2143 /* Set up network device as normal. */
2144 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
2145 dev->netdev_ops = &virtnet_netdev;
2146 dev->features = NETIF_F_HIGHDMA;
2148 dev->ethtool_ops = &virtnet_ethtool_ops;
2149 SET_NETDEV_DEV(dev, &vdev->dev);
2151 /* Do we support "hardware" checksums? */
2152 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
2153 /* This opens up the world of extra features. */
2154 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2156 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
2158 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
2159 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
2160 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
2162 /* Individual feature bits: what can host handle? */
2163 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
2164 dev->hw_features |= NETIF_F_TSO;
2165 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
2166 dev->hw_features |= NETIF_F_TSO6;
2167 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
2168 dev->hw_features |= NETIF_F_TSO_ECN;
2169 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
2170 dev->hw_features |= NETIF_F_UFO;
2172 dev->features |= NETIF_F_GSO_ROBUST;
2175 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
2176 /* (!csum && gso) case will be fixed by register_netdev() */
2178 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
2179 dev->features |= NETIF_F_RXCSUM;
2181 dev->vlan_features = dev->features;
2183 /* MTU range: 68 - 65535 */
2184 dev->min_mtu = MIN_MTU;
2185 dev->max_mtu = MAX_MTU;
2187 /* Configuration may specify what MAC to use. Otherwise random. */
2188 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
2189 virtio_cread_bytes(vdev,
2190 offsetof(struct virtio_net_config, mac),
2191 dev->dev_addr, dev->addr_len);
2193 eth_hw_addr_random(dev);
2195 /* Set up our device-specific information */
2196 vi = netdev_priv(dev);
2200 vi->stats = alloc_percpu(struct virtnet_stats);
2202 if (vi->stats == NULL)
2205 for_each_possible_cpu(i) {
2206 struct virtnet_stats *virtnet_stats;
2207 virtnet_stats = per_cpu_ptr(vi->stats, i);
2208 u64_stats_init(&virtnet_stats->tx_syncp);
2209 u64_stats_init(&virtnet_stats->rx_syncp);
2212 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
2214 /* If we can receive ANY GSO packets, we must allocate large ones. */
2215 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2216 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2217 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
2218 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
2219 vi->big_packets = true;
2221 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
2222 vi->mergeable_rx_bufs = true;
2224 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
2225 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2226 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2228 vi->hdr_len = sizeof(struct virtio_net_hdr);
2230 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
2231 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
2232 vi->any_header_sg = true;
2234 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2237 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2238 mtu = virtio_cread16(vdev,
2239 offsetof(struct virtio_net_config,
2241 if (mtu < dev->min_mtu) {
2242 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2249 if (vi->any_header_sg)
2250 dev->needed_headroom = vi->hdr_len;
2252 /* Enable multiqueue by default */
2253 if (num_online_cpus() >= max_queue_pairs)
2254 vi->curr_queue_pairs = max_queue_pairs;
2256 vi->curr_queue_pairs = num_online_cpus();
2257 vi->max_queue_pairs = max_queue_pairs;
2259 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
2265 if (vi->mergeable_rx_bufs)
2266 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
2268 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
2269 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
2271 virtnet_init_settings(dev);
2273 err = register_netdev(dev);
2275 pr_debug("virtio_net: registering device failed\n");
2279 virtio_device_ready(vdev);
2281 err = virtnet_cpu_notif_add(vi);
2283 pr_debug("virtio_net: registering cpu notifier failed\n");
2284 goto free_unregister_netdev;
2288 virtnet_set_queues(vi, vi->curr_queue_pairs);
2291 /* Assume link up if device can't report link status,
2292 otherwise get link status from config. */
2293 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
2294 netif_carrier_off(dev);
2295 schedule_work(&vi->config_work);
2297 vi->status = VIRTIO_NET_S_LINK_UP;
2298 netif_carrier_on(dev);
2301 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
2302 dev->name, max_queue_pairs);
2306 free_unregister_netdev:
2307 vi->vdev->config->reset(vdev);
2309 unregister_netdev(dev);
2311 cancel_delayed_work_sync(&vi->refill);
2312 free_receive_page_frags(vi);
2313 virtnet_del_vqs(vi);
2315 free_percpu(vi->stats);
2321 static void remove_vq_common(struct virtnet_info *vi)
2323 vi->vdev->config->reset(vi->vdev);
2325 /* Free unused buffers in both send and recv, if any. */
2326 free_unused_bufs(vi);
2328 free_receive_bufs(vi);
2330 free_receive_page_frags(vi);
2332 virtnet_del_vqs(vi);
2335 static void virtnet_remove(struct virtio_device *vdev)
2337 struct virtnet_info *vi = vdev->priv;
2339 virtnet_cpu_notif_remove(vi);
2341 /* Make sure no work handler is accessing the device. */
2342 flush_work(&vi->config_work);
2344 unregister_netdev(vi->dev);
2346 remove_vq_common(vi);
2348 free_percpu(vi->stats);
2349 free_netdev(vi->dev);
2352 #ifdef CONFIG_PM_SLEEP
2353 static int virtnet_freeze(struct virtio_device *vdev)
2355 struct virtnet_info *vi = vdev->priv;
2358 virtnet_cpu_notif_remove(vi);
2360 /* Make sure no work handler is accessing the device */
2361 flush_work(&vi->config_work);
2363 netif_device_detach(vi->dev);
2364 cancel_delayed_work_sync(&vi->refill);
2366 if (netif_running(vi->dev)) {
2367 for (i = 0; i < vi->max_queue_pairs; i++)
2368 napi_disable(&vi->rq[i].napi);
2371 remove_vq_common(vi);
2376 static int virtnet_restore(struct virtio_device *vdev)
2378 struct virtnet_info *vi = vdev->priv;
2385 virtio_device_ready(vdev);
2387 if (netif_running(vi->dev)) {
2388 for (i = 0; i < vi->curr_queue_pairs; i++)
2389 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2390 schedule_delayed_work(&vi->refill, 0);
2392 for (i = 0; i < vi->max_queue_pairs; i++)
2393 virtnet_napi_enable(&vi->rq[i]);
2396 netif_device_attach(vi->dev);
2399 virtnet_set_queues(vi, vi->curr_queue_pairs);
2402 err = virtnet_cpu_notif_add(vi);
2410 static struct virtio_device_id id_table[] = {
2411 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
2415 #define VIRTNET_FEATURES \
2416 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
2418 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
2419 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
2420 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
2421 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
2422 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
2423 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
2424 VIRTIO_NET_F_CTRL_MAC_ADDR, \
2427 static unsigned int features[] = {
2431 static unsigned int features_legacy[] = {
2434 VIRTIO_F_ANY_LAYOUT,
2437 static struct virtio_driver virtio_net_driver = {
2438 .feature_table = features,
2439 .feature_table_size = ARRAY_SIZE(features),
2440 .feature_table_legacy = features_legacy,
2441 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
2442 .driver.name = KBUILD_MODNAME,
2443 .driver.owner = THIS_MODULE,
2444 .id_table = id_table,
2445 .probe = virtnet_probe,
2446 .remove = virtnet_remove,
2447 .config_changed = virtnet_config_changed,
2448 #ifdef CONFIG_PM_SLEEP
2449 .freeze = virtnet_freeze,
2450 .restore = virtnet_restore,
2454 static __init int virtio_net_driver_init(void)
2458 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "AP_VIRT_NET_ONLINE",
2460 virtnet_cpu_down_prep);
2463 virtionet_online = ret;
2464 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "VIRT_NET_DEAD",
2465 NULL, virtnet_cpu_dead);
2469 ret = register_virtio_driver(&virtio_net_driver);
2474 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
2476 cpuhp_remove_multi_state(virtionet_online);
2480 module_init(virtio_net_driver_init);
2482 static __exit void virtio_net_driver_exit(void)
2484 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
2485 cpuhp_remove_multi_state(virtionet_online);
2486 unregister_virtio_driver(&virtio_net_driver);
2488 module_exit(virtio_net_driver_exit);
2490 MODULE_DEVICE_TABLE(virtio, id_table);
2491 MODULE_DESCRIPTION("Virtio network driver");
2492 MODULE_LICENSE("GPL");