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, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/ethtool.h>
23 #include <linux/module.h>
24 #include <linux/virtio.h>
25 #include <linux/virtio_net.h>
26 #include <linux/scatterlist.h>
27 #include <linux/if_vlan.h>
28 #include <linux/slab.h>
30 static int napi_weight = 128;
31 module_param(napi_weight, int, 0444);
33 static bool csum = true, gso = true;
34 module_param(csum, bool, 0444);
35 module_param(gso, bool, 0444);
37 /* FIXME: MTU in config. */
38 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
39 #define GOOD_COPY_LEN 128
41 #define VIRTNET_SEND_COMMAND_SG_MAX 2
42 #define VIRTNET_DRIVER_VERSION "1.0.0"
44 struct virtnet_stats {
45 struct u64_stats_sync tx_syncp;
46 struct u64_stats_sync rx_syncp;
54 /* Internal representation of a send virtqueue */
56 /* Virtqueue associated with this send _queue */
59 /* TX: fragments + linear part + virtio header */
60 struct scatterlist sg[MAX_SKB_FRAGS + 2];
62 /* Name of the send queue: output.$index */
66 /* Internal representation of a receive virtqueue */
67 struct receive_queue {
68 /* Virtqueue associated with this receive_queue */
71 struct napi_struct napi;
73 /* Number of input buffers, and max we've ever had. */
74 unsigned int num, max;
76 /* Chain pages by the private ptr. */
79 /* RX: fragments + linear part + virtio header */
80 struct scatterlist sg[MAX_SKB_FRAGS + 2];
82 /* Name of this receive queue: input.$index */
87 struct virtio_device *vdev;
88 struct virtqueue *cvq;
89 struct net_device *dev;
90 struct send_queue *sq;
91 struct receive_queue *rq;
94 /* Max # of queue pairs supported by the device */
97 /* # of queue pairs currently used by the driver */
100 /* I like... big packets and I cannot lie! */
103 /* Host will merge rx buffers for big packets (shake it! shake it!) */
104 bool mergeable_rx_bufs;
106 /* Has control virtqueue */
109 /* enable config space updates */
112 /* Active statistics */
113 struct virtnet_stats __percpu *stats;
115 /* Work struct for refilling if we run low on memory. */
116 struct delayed_work refill;
118 /* Work struct for config space updates */
119 struct work_struct config_work;
121 /* Lock for config space updates */
122 struct mutex config_lock;
124 /* Does the affinity hint is set for virtqueues? */
125 bool affinity_hint_set;
127 /* Per-cpu variable to show the mapping from CPU to virtqueue */
128 int __percpu *vq_index;
131 struct skb_vnet_hdr {
133 struct virtio_net_hdr hdr;
134 struct virtio_net_hdr_mrg_rxbuf mhdr;
138 struct padded_vnet_hdr {
139 struct virtio_net_hdr hdr;
141 * virtio_net_hdr should be in a separated sg buffer because of a
142 * QEMU bug, and data sg buffer shares same page with this header sg.
143 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
148 /* Converting between virtqueue no. and kernel tx/rx queue no.
149 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
151 static int vq2txq(struct virtqueue *vq)
153 return (virtqueue_get_queue_index(vq) - 1) / 2;
156 static int txq2vq(int txq)
161 static int vq2rxq(struct virtqueue *vq)
163 return virtqueue_get_queue_index(vq) / 2;
166 static int rxq2vq(int rxq)
171 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
173 return (struct skb_vnet_hdr *)skb->cb;
177 * private is used to chain pages for big packets, put the whole
178 * most recent used list in the beginning for reuse
180 static void give_pages(struct receive_queue *rq, struct page *page)
184 /* Find end of list, sew whole thing into vi->rq.pages. */
185 for (end = page; end->private; end = (struct page *)end->private);
186 end->private = (unsigned long)rq->pages;
190 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
192 struct page *p = rq->pages;
195 rq->pages = (struct page *)p->private;
196 /* clear private here, it is used to chain pages */
199 p = alloc_page(gfp_mask);
203 static void skb_xmit_done(struct virtqueue *vq)
205 struct virtnet_info *vi = vq->vdev->priv;
207 /* Suppress further interrupts. */
208 virtqueue_disable_cb(vq);
210 /* We were probably waiting for more output buffers. */
211 netif_wake_subqueue(vi->dev, vq2txq(vq));
214 static void set_skb_frag(struct sk_buff *skb, struct page *page,
215 unsigned int offset, unsigned int *len)
217 int size = min((unsigned)PAGE_SIZE - offset, *len);
218 int i = skb_shinfo(skb)->nr_frags;
220 __skb_fill_page_desc(skb, i, page, offset, size);
222 skb->data_len += size;
224 skb->truesize += PAGE_SIZE;
225 skb_shinfo(skb)->nr_frags++;
229 /* Called from bottom half context */
230 static struct sk_buff *page_to_skb(struct receive_queue *rq,
231 struct page *page, unsigned int len)
233 struct virtnet_info *vi = rq->vq->vdev->priv;
235 struct skb_vnet_hdr *hdr;
236 unsigned int copy, hdr_len, offset;
239 p = page_address(page);
241 /* copy small packet so we can reuse these pages for small data */
242 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
246 hdr = skb_vnet_hdr(skb);
248 if (vi->mergeable_rx_bufs) {
249 hdr_len = sizeof hdr->mhdr;
252 hdr_len = sizeof hdr->hdr;
253 offset = sizeof(struct padded_vnet_hdr);
256 memcpy(hdr, p, hdr_len);
262 if (copy > skb_tailroom(skb))
263 copy = skb_tailroom(skb);
264 memcpy(skb_put(skb, copy), p, copy);
270 * Verify that we can indeed put this data into a skb.
271 * This is here to handle cases when the device erroneously
272 * tries to receive more than is possible. This is usually
273 * the case of a broken device.
275 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
276 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
282 set_skb_frag(skb, page, offset, &len);
283 page = (struct page *)page->private;
288 give_pages(rq, page);
293 static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb)
295 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
299 num_buf = hdr->mhdr.num_buffers;
301 i = skb_shinfo(skb)->nr_frags;
302 if (i >= MAX_SKB_FRAGS) {
303 pr_debug("%s: packet too long\n", skb->dev->name);
304 skb->dev->stats.rx_length_errors++;
307 page = virtqueue_get_buf(rq->vq, &len);
309 pr_debug("%s: rx error: %d buffers missing\n",
310 skb->dev->name, hdr->mhdr.num_buffers);
311 skb->dev->stats.rx_length_errors++;
318 set_skb_frag(skb, page, 0, &len);
325 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
327 struct virtnet_info *vi = rq->vq->vdev->priv;
328 struct net_device *dev = vi->dev;
329 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
332 struct skb_vnet_hdr *hdr;
334 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
335 pr_debug("%s: short packet %i\n", dev->name, len);
336 dev->stats.rx_length_errors++;
337 if (vi->mergeable_rx_bufs || vi->big_packets)
344 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
346 len -= sizeof(struct virtio_net_hdr);
350 skb = page_to_skb(rq, page, len);
351 if (unlikely(!skb)) {
352 dev->stats.rx_dropped++;
353 give_pages(rq, page);
356 if (vi->mergeable_rx_bufs)
357 if (receive_mergeable(rq, skb)) {
363 hdr = skb_vnet_hdr(skb);
365 u64_stats_update_begin(&stats->rx_syncp);
366 stats->rx_bytes += skb->len;
368 u64_stats_update_end(&stats->rx_syncp);
370 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
371 pr_debug("Needs csum!\n");
372 if (!skb_partial_csum_set(skb,
374 hdr->hdr.csum_offset))
376 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
377 skb->ip_summed = CHECKSUM_UNNECESSARY;
380 skb->protocol = eth_type_trans(skb, dev);
381 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
382 ntohs(skb->protocol), skb->len, skb->pkt_type);
384 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
386 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
387 case VIRTIO_NET_HDR_GSO_TCPV4:
388 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
390 case VIRTIO_NET_HDR_GSO_UDP:
391 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
393 case VIRTIO_NET_HDR_GSO_TCPV6:
394 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
397 net_warn_ratelimited("%s: bad gso type %u.\n",
398 dev->name, hdr->hdr.gso_type);
402 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
403 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
405 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
406 if (skb_shinfo(skb)->gso_size == 0) {
407 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
411 /* Header must be checked, and gso_segs computed. */
412 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
413 skb_shinfo(skb)->gso_segs = 0;
416 netif_receive_skb(skb);
420 dev->stats.rx_frame_errors++;
424 static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
426 struct virtnet_info *vi = rq->vq->vdev->priv;
428 struct skb_vnet_hdr *hdr;
431 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
435 skb_put(skb, MAX_PACKET_LEN);
437 hdr = skb_vnet_hdr(skb);
438 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
440 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
442 err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp);
449 static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
451 struct page *first, *list = NULL;
455 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
456 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
457 first = get_a_page(rq, gfp);
460 give_pages(rq, list);
463 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
465 /* chain new page in list head to match sg */
466 first->private = (unsigned long)list;
470 first = get_a_page(rq, gfp);
472 give_pages(rq, list);
475 p = page_address(first);
477 /* rq->sg[0], rq->sg[1] share the same page */
478 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
479 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
481 /* rq->sg[1] for data packet, from offset */
482 offset = sizeof(struct padded_vnet_hdr);
483 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
485 /* chain first in list head */
486 first->private = (unsigned long)list;
487 err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2,
490 give_pages(rq, first);
495 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
500 page = get_a_page(rq, gfp);
504 sg_init_one(rq->sg, page_address(page), PAGE_SIZE);
506 err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp);
508 give_pages(rq, page);
514 * Returns false if we couldn't fill entirely (OOM).
516 * Normally run in the receive path, but can also be run from ndo_open
517 * before we're receiving packets, or from refill_work which is
518 * careful to disable receiving (using napi_disable).
520 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
522 struct virtnet_info *vi = rq->vq->vdev->priv;
527 if (vi->mergeable_rx_bufs)
528 err = add_recvbuf_mergeable(rq, gfp);
529 else if (vi->big_packets)
530 err = add_recvbuf_big(rq, gfp);
532 err = add_recvbuf_small(rq, gfp);
534 oom = err == -ENOMEM;
538 } while (rq->vq->num_free);
539 if (unlikely(rq->num > rq->max))
541 virtqueue_kick(rq->vq);
545 static void skb_recv_done(struct virtqueue *rvq)
547 struct virtnet_info *vi = rvq->vdev->priv;
548 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
550 /* Schedule NAPI, Suppress further interrupts if successful. */
551 if (napi_schedule_prep(&rq->napi)) {
552 virtqueue_disable_cb(rvq);
553 __napi_schedule(&rq->napi);
557 static void virtnet_napi_enable(struct receive_queue *rq)
559 napi_enable(&rq->napi);
561 /* If all buffers were filled by other side before we napi_enabled, we
562 * won't get another interrupt, so process any outstanding packets
563 * now. virtnet_poll wants re-enable the queue, so we disable here.
564 * We synchronize against interrupts via NAPI_STATE_SCHED */
565 if (napi_schedule_prep(&rq->napi)) {
566 virtqueue_disable_cb(rq->vq);
568 __napi_schedule(&rq->napi);
573 static void refill_work(struct work_struct *work)
575 struct virtnet_info *vi =
576 container_of(work, struct virtnet_info, refill.work);
580 for (i = 0; i < vi->max_queue_pairs; i++) {
581 struct receive_queue *rq = &vi->rq[i];
583 napi_disable(&rq->napi);
584 still_empty = !try_fill_recv(rq, GFP_KERNEL);
585 virtnet_napi_enable(rq);
587 /* In theory, this can happen: if we don't get any buffers in
588 * we will *never* try to fill again.
591 schedule_delayed_work(&vi->refill, HZ/2);
595 static int virtnet_poll(struct napi_struct *napi, int budget)
597 struct receive_queue *rq =
598 container_of(napi, struct receive_queue, napi);
599 struct virtnet_info *vi = rq->vq->vdev->priv;
601 unsigned int len, received = 0;
604 while (received < budget &&
605 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
606 receive_buf(rq, buf, len);
611 if (rq->num < rq->max / 2) {
612 if (!try_fill_recv(rq, GFP_ATOMIC))
613 schedule_delayed_work(&vi->refill, 0);
616 /* Out of packets? */
617 if (received < budget) {
619 if (unlikely(!virtqueue_enable_cb(rq->vq)) &&
620 napi_schedule_prep(napi)) {
621 virtqueue_disable_cb(rq->vq);
622 __napi_schedule(napi);
630 static int virtnet_open(struct net_device *dev)
632 struct virtnet_info *vi = netdev_priv(dev);
635 for (i = 0; i < vi->max_queue_pairs; i++) {
636 /* Make sure we have some buffers: if oom use wq. */
637 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
638 schedule_delayed_work(&vi->refill, 0);
639 virtnet_napi_enable(&vi->rq[i]);
645 static void free_old_xmit_skbs(struct send_queue *sq)
649 struct virtnet_info *vi = sq->vq->vdev->priv;
650 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
652 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
653 pr_debug("Sent skb %p\n", skb);
655 u64_stats_update_begin(&stats->tx_syncp);
656 stats->tx_bytes += skb->len;
658 u64_stats_update_end(&stats->tx_syncp);
660 dev_kfree_skb_any(skb);
664 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
666 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
667 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
668 struct virtnet_info *vi = sq->vq->vdev->priv;
671 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
673 if (skb->ip_summed == CHECKSUM_PARTIAL) {
674 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
675 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
676 hdr->hdr.csum_offset = skb->csum_offset;
679 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
682 if (skb_is_gso(skb)) {
683 hdr->hdr.hdr_len = skb_headlen(skb);
684 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
685 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
686 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
687 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
688 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
689 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
690 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
693 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
694 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
696 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
697 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
700 hdr->mhdr.num_buffers = 0;
702 /* Encode metadata header at front. */
703 if (vi->mergeable_rx_bufs)
704 sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr);
706 sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr);
708 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
709 return virtqueue_add_buf(sq->vq, sq->sg, num_sg,
713 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
715 struct virtnet_info *vi = netdev_priv(dev);
716 int qnum = skb_get_queue_mapping(skb);
717 struct send_queue *sq = &vi->sq[qnum];
720 /* Free up any pending old buffers before queueing new ones. */
721 free_old_xmit_skbs(sq);
723 /* Try to transmit */
724 err = xmit_skb(sq, skb);
726 /* This should not happen! */
728 dev->stats.tx_fifo_errors++;
731 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
732 dev->stats.tx_dropped++;
736 virtqueue_kick(sq->vq);
738 /* Don't wait up for transmitted skbs to be freed. */
742 /* Apparently nice girls don't return TX_BUSY; stop the queue
743 * before it gets out of hand. Naturally, this wastes entries. */
744 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
745 netif_stop_subqueue(dev, qnum);
746 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
747 /* More just got used, free them then recheck. */
748 free_old_xmit_skbs(sq);
749 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
750 netif_start_subqueue(dev, qnum);
751 virtqueue_disable_cb(sq->vq);
759 static int virtnet_set_mac_address(struct net_device *dev, void *p)
761 struct virtnet_info *vi = netdev_priv(dev);
762 struct virtio_device *vdev = vi->vdev;
765 ret = eth_mac_addr(dev, p);
769 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
770 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
771 dev->dev_addr, dev->addr_len);
776 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
777 struct rtnl_link_stats64 *tot)
779 struct virtnet_info *vi = netdev_priv(dev);
783 for_each_possible_cpu(cpu) {
784 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
785 u64 tpackets, tbytes, rpackets, rbytes;
788 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
789 tpackets = stats->tx_packets;
790 tbytes = stats->tx_bytes;
791 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
794 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
795 rpackets = stats->rx_packets;
796 rbytes = stats->rx_bytes;
797 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
799 tot->rx_packets += rpackets;
800 tot->tx_packets += tpackets;
801 tot->rx_bytes += rbytes;
802 tot->tx_bytes += tbytes;
805 tot->tx_dropped = dev->stats.tx_dropped;
806 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
807 tot->rx_dropped = dev->stats.rx_dropped;
808 tot->rx_length_errors = dev->stats.rx_length_errors;
809 tot->rx_frame_errors = dev->stats.rx_frame_errors;
814 #ifdef CONFIG_NET_POLL_CONTROLLER
815 static void virtnet_netpoll(struct net_device *dev)
817 struct virtnet_info *vi = netdev_priv(dev);
820 for (i = 0; i < vi->curr_queue_pairs; i++)
821 napi_schedule(&vi->rq[i].napi);
826 * Send command via the control virtqueue and check status. Commands
827 * supported by the hypervisor, as indicated by feature bits, should
828 * never fail unless improperly formated.
830 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
831 struct scatterlist *data, int out, int in)
833 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
834 struct virtio_net_ctrl_hdr ctrl;
835 virtio_net_ctrl_ack status = ~0;
839 /* Caller should know better */
840 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
841 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
843 out++; /* Add header */
844 in++; /* Add return status */
849 sg_init_table(sg, out + in);
851 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
852 for_each_sg(data, s, out + in - 2, i)
853 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
854 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
856 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
858 virtqueue_kick(vi->cvq);
861 * Spin for a response, the kick causes an ioport write, trapping
862 * into the hypervisor, so the request should be handled immediately.
864 while (!virtqueue_get_buf(vi->cvq, &tmp))
867 return status == VIRTIO_NET_OK;
870 static void virtnet_ack_link_announce(struct virtnet_info *vi)
873 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
874 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL,
876 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
880 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
882 struct scatterlist sg;
883 struct virtio_net_ctrl_mq s;
884 struct net_device *dev = vi->dev;
886 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
889 s.virtqueue_pairs = queue_pairs;
890 sg_init_one(&sg, &s, sizeof(s));
892 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
893 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){
894 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
898 vi->curr_queue_pairs = queue_pairs;
903 static int virtnet_close(struct net_device *dev)
905 struct virtnet_info *vi = netdev_priv(dev);
908 /* Make sure refill_work doesn't re-enable napi! */
909 cancel_delayed_work_sync(&vi->refill);
911 for (i = 0; i < vi->max_queue_pairs; i++)
912 napi_disable(&vi->rq[i].napi);
917 static void virtnet_set_rx_mode(struct net_device *dev)
919 struct virtnet_info *vi = netdev_priv(dev);
920 struct scatterlist sg[2];
921 u8 promisc, allmulti;
922 struct virtio_net_ctrl_mac *mac_data;
923 struct netdev_hw_addr *ha;
929 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
930 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
933 promisc = ((dev->flags & IFF_PROMISC) != 0);
934 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
936 sg_init_one(sg, &promisc, sizeof(promisc));
938 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
939 VIRTIO_NET_CTRL_RX_PROMISC,
941 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
942 promisc ? "en" : "dis");
944 sg_init_one(sg, &allmulti, sizeof(allmulti));
946 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
947 VIRTIO_NET_CTRL_RX_ALLMULTI,
949 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
950 allmulti ? "en" : "dis");
952 uc_count = netdev_uc_count(dev);
953 mc_count = netdev_mc_count(dev);
954 /* MAC filter - use one buffer for both lists */
955 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
956 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
959 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
963 sg_init_table(sg, 2);
965 /* Store the unicast list and count in the front of the buffer */
966 mac_data->entries = uc_count;
968 netdev_for_each_uc_addr(ha, dev)
969 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
971 sg_set_buf(&sg[0], mac_data,
972 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
974 /* multicast list and count fill the end */
975 mac_data = (void *)&mac_data->macs[uc_count][0];
977 mac_data->entries = mc_count;
979 netdev_for_each_mc_addr(ha, dev)
980 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
982 sg_set_buf(&sg[1], mac_data,
983 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
985 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
986 VIRTIO_NET_CTRL_MAC_TABLE_SET,
988 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
993 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
995 struct virtnet_info *vi = netdev_priv(dev);
996 struct scatterlist sg;
998 sg_init_one(&sg, &vid, sizeof(vid));
1000 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1001 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
1002 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1006 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
1008 struct virtnet_info *vi = netdev_priv(dev);
1009 struct scatterlist sg;
1011 sg_init_one(&sg, &vid, sizeof(vid));
1013 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1014 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
1015 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1019 static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
1024 /* In multiqueue mode, when the number of cpu is equal to the number of
1025 * queue pairs, we let the queue pairs to be private to one cpu by
1026 * setting the affinity hint to eliminate the contention.
1028 if ((vi->curr_queue_pairs == 1 ||
1029 vi->max_queue_pairs != num_online_cpus()) && set) {
1030 if (vi->affinity_hint_set) {
1034 for_each_online_cpu(cpu)
1035 *per_cpu_ptr(vi->vq_index, cpu) =
1036 ++i % vi->curr_queue_pairs;
1043 for_each_online_cpu(cpu) {
1044 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1045 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1046 *per_cpu_ptr(vi->vq_index, cpu) = i;
1050 vi->affinity_hint_set = true;
1052 for(i = 0; i < vi->max_queue_pairs; i++) {
1053 virtqueue_set_affinity(vi->rq[i].vq, -1);
1054 virtqueue_set_affinity(vi->sq[i].vq, -1);
1058 for_each_online_cpu(cpu)
1059 *per_cpu_ptr(vi->vq_index, cpu) =
1060 ++i % vi->curr_queue_pairs;
1062 vi->affinity_hint_set = false;
1066 static void virtnet_get_ringparam(struct net_device *dev,
1067 struct ethtool_ringparam *ring)
1069 struct virtnet_info *vi = netdev_priv(dev);
1071 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1072 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1073 ring->rx_pending = ring->rx_max_pending;
1074 ring->tx_pending = ring->tx_max_pending;
1078 static void virtnet_get_drvinfo(struct net_device *dev,
1079 struct ethtool_drvinfo *info)
1081 struct virtnet_info *vi = netdev_priv(dev);
1082 struct virtio_device *vdev = vi->vdev;
1084 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1085 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1086 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1090 /* TODO: Eliminate OOO packets during switching */
1091 static int virtnet_set_channels(struct net_device *dev,
1092 struct ethtool_channels *channels)
1094 struct virtnet_info *vi = netdev_priv(dev);
1095 u16 queue_pairs = channels->combined_count;
1098 /* We don't support separate rx/tx channels.
1099 * We don't allow setting 'other' channels.
1101 if (channels->rx_count || channels->tx_count || channels->other_count)
1104 if (queue_pairs > vi->max_queue_pairs)
1108 err = virtnet_set_queues(vi, queue_pairs);
1110 netif_set_real_num_tx_queues(dev, queue_pairs);
1111 netif_set_real_num_rx_queues(dev, queue_pairs);
1113 virtnet_set_affinity(vi, true);
1120 static void virtnet_get_channels(struct net_device *dev,
1121 struct ethtool_channels *channels)
1123 struct virtnet_info *vi = netdev_priv(dev);
1125 channels->combined_count = vi->curr_queue_pairs;
1126 channels->max_combined = vi->max_queue_pairs;
1127 channels->max_other = 0;
1128 channels->rx_count = 0;
1129 channels->tx_count = 0;
1130 channels->other_count = 0;
1133 static const struct ethtool_ops virtnet_ethtool_ops = {
1134 .get_drvinfo = virtnet_get_drvinfo,
1135 .get_link = ethtool_op_get_link,
1136 .get_ringparam = virtnet_get_ringparam,
1137 .set_channels = virtnet_set_channels,
1138 .get_channels = virtnet_get_channels,
1142 #define MAX_MTU 65535
1144 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1146 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1152 /* To avoid contending a lock hold by a vcpu who would exit to host, select the
1153 * txq based on the processor id.
1155 static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
1158 struct virtnet_info *vi = netdev_priv(dev);
1160 if (skb_rx_queue_recorded(skb)) {
1161 txq = skb_get_rx_queue(skb);
1163 txq = *__this_cpu_ptr(vi->vq_index);
1168 while (unlikely(txq >= dev->real_num_tx_queues))
1169 txq -= dev->real_num_tx_queues;
1174 static const struct net_device_ops virtnet_netdev = {
1175 .ndo_open = virtnet_open,
1176 .ndo_stop = virtnet_close,
1177 .ndo_start_xmit = start_xmit,
1178 .ndo_validate_addr = eth_validate_addr,
1179 .ndo_set_mac_address = virtnet_set_mac_address,
1180 .ndo_set_rx_mode = virtnet_set_rx_mode,
1181 .ndo_change_mtu = virtnet_change_mtu,
1182 .ndo_get_stats64 = virtnet_stats,
1183 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1184 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1185 .ndo_select_queue = virtnet_select_queue,
1186 #ifdef CONFIG_NET_POLL_CONTROLLER
1187 .ndo_poll_controller = virtnet_netpoll,
1191 static void virtnet_config_changed_work(struct work_struct *work)
1193 struct virtnet_info *vi =
1194 container_of(work, struct virtnet_info, config_work);
1197 mutex_lock(&vi->config_lock);
1198 if (!vi->config_enable)
1201 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
1202 offsetof(struct virtio_net_config, status),
1206 if (v & VIRTIO_NET_S_ANNOUNCE) {
1207 netdev_notify_peers(vi->dev);
1208 virtnet_ack_link_announce(vi);
1211 /* Ignore unknown (future) status bits */
1212 v &= VIRTIO_NET_S_LINK_UP;
1214 if (vi->status == v)
1219 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1220 netif_carrier_on(vi->dev);
1221 netif_tx_wake_all_queues(vi->dev);
1223 netif_carrier_off(vi->dev);
1224 netif_tx_stop_all_queues(vi->dev);
1227 mutex_unlock(&vi->config_lock);
1230 static void virtnet_config_changed(struct virtio_device *vdev)
1232 struct virtnet_info *vi = vdev->priv;
1234 schedule_work(&vi->config_work);
1237 static void virtnet_free_queues(struct virtnet_info *vi)
1243 static void free_receive_bufs(struct virtnet_info *vi)
1247 for (i = 0; i < vi->max_queue_pairs; i++) {
1248 while (vi->rq[i].pages)
1249 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1253 static void free_unused_bufs(struct virtnet_info *vi)
1258 for (i = 0; i < vi->max_queue_pairs; i++) {
1259 struct virtqueue *vq = vi->sq[i].vq;
1260 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1264 for (i = 0; i < vi->max_queue_pairs; i++) {
1265 struct virtqueue *vq = vi->rq[i].vq;
1267 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1268 if (vi->mergeable_rx_bufs || vi->big_packets)
1269 give_pages(&vi->rq[i], buf);
1274 BUG_ON(vi->rq[i].num != 0);
1278 static void virtnet_del_vqs(struct virtnet_info *vi)
1280 struct virtio_device *vdev = vi->vdev;
1282 virtnet_set_affinity(vi, false);
1284 vdev->config->del_vqs(vdev);
1286 virtnet_free_queues(vi);
1289 static int virtnet_find_vqs(struct virtnet_info *vi)
1291 vq_callback_t **callbacks;
1292 struct virtqueue **vqs;
1297 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1298 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1299 * possible control vq.
1301 total_vqs = vi->max_queue_pairs * 2 +
1302 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1304 /* Allocate space for find_vqs parameters */
1305 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1308 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1311 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1315 /* Parameters for control virtqueue, if any */
1317 callbacks[total_vqs - 1] = NULL;
1318 names[total_vqs - 1] = "control";
1321 /* Allocate/initialize parameters for send/receive virtqueues */
1322 for (i = 0; i < vi->max_queue_pairs; i++) {
1323 callbacks[rxq2vq(i)] = skb_recv_done;
1324 callbacks[txq2vq(i)] = skb_xmit_done;
1325 sprintf(vi->rq[i].name, "input.%d", i);
1326 sprintf(vi->sq[i].name, "output.%d", i);
1327 names[rxq2vq(i)] = vi->rq[i].name;
1328 names[txq2vq(i)] = vi->sq[i].name;
1331 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1337 vi->cvq = vqs[total_vqs - 1];
1338 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1339 vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1342 for (i = 0; i < vi->max_queue_pairs; i++) {
1343 vi->rq[i].vq = vqs[rxq2vq(i)];
1344 vi->sq[i].vq = vqs[txq2vq(i)];
1363 static int virtnet_alloc_queues(struct virtnet_info *vi)
1367 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1370 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1374 INIT_DELAYED_WORK(&vi->refill, refill_work);
1375 for (i = 0; i < vi->max_queue_pairs; i++) {
1376 vi->rq[i].pages = NULL;
1377 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1380 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1381 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1392 static int init_vqs(struct virtnet_info *vi)
1396 /* Allocate send & receive queues */
1397 ret = virtnet_alloc_queues(vi);
1401 ret = virtnet_find_vqs(vi);
1406 virtnet_set_affinity(vi, true);
1412 virtnet_free_queues(vi);
1417 static int virtnet_probe(struct virtio_device *vdev)
1420 struct net_device *dev;
1421 struct virtnet_info *vi;
1422 u16 max_queue_pairs;
1424 /* Find if host supports multiqueue virtio_net device */
1425 err = virtio_config_val(vdev, VIRTIO_NET_F_MQ,
1426 offsetof(struct virtio_net_config,
1427 max_virtqueue_pairs), &max_queue_pairs);
1429 /* We need at least 2 queue's */
1430 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1431 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1432 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1433 max_queue_pairs = 1;
1435 /* Allocate ourselves a network device with room for our info */
1436 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1440 /* Set up network device as normal. */
1441 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1442 dev->netdev_ops = &virtnet_netdev;
1443 dev->features = NETIF_F_HIGHDMA;
1445 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1446 SET_NETDEV_DEV(dev, &vdev->dev);
1448 /* Do we support "hardware" checksums? */
1449 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1450 /* This opens up the world of extra features. */
1451 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1453 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1455 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1456 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1457 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1459 /* Individual feature bits: what can host handle? */
1460 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1461 dev->hw_features |= NETIF_F_TSO;
1462 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1463 dev->hw_features |= NETIF_F_TSO6;
1464 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1465 dev->hw_features |= NETIF_F_TSO_ECN;
1466 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1467 dev->hw_features |= NETIF_F_UFO;
1470 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1471 /* (!csum && gso) case will be fixed by register_netdev() */
1474 /* Configuration may specify what MAC to use. Otherwise random. */
1475 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1476 offsetof(struct virtio_net_config, mac),
1477 dev->dev_addr, dev->addr_len) < 0)
1478 eth_hw_addr_random(dev);
1480 /* Set up our device-specific information */
1481 vi = netdev_priv(dev);
1485 vi->stats = alloc_percpu(struct virtnet_stats);
1487 if (vi->stats == NULL)
1490 vi->vq_index = alloc_percpu(int);
1491 if (vi->vq_index == NULL)
1494 mutex_init(&vi->config_lock);
1495 vi->config_enable = true;
1496 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1498 /* If we can receive ANY GSO packets, we must allocate large ones. */
1499 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1500 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1501 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1502 vi->big_packets = true;
1504 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1505 vi->mergeable_rx_bufs = true;
1507 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1510 /* Use single tx/rx queue pair as default */
1511 vi->curr_queue_pairs = 1;
1512 vi->max_queue_pairs = max_queue_pairs;
1514 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1519 netif_set_real_num_tx_queues(dev, 1);
1520 netif_set_real_num_rx_queues(dev, 1);
1522 err = register_netdev(dev);
1524 pr_debug("virtio_net: registering device failed\n");
1528 /* Last of all, set up some receive buffers. */
1529 for (i = 0; i < vi->max_queue_pairs; i++) {
1530 try_fill_recv(&vi->rq[i], GFP_KERNEL);
1532 /* If we didn't even get one input buffer, we're useless. */
1533 if (vi->rq[i].num == 0) {
1534 free_unused_bufs(vi);
1536 goto free_recv_bufs;
1540 /* Assume link up if device can't report link status,
1541 otherwise get link status from config. */
1542 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1543 netif_carrier_off(dev);
1544 schedule_work(&vi->config_work);
1546 vi->status = VIRTIO_NET_S_LINK_UP;
1547 netif_carrier_on(dev);
1550 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1551 dev->name, max_queue_pairs);
1556 free_receive_bufs(vi);
1557 unregister_netdev(dev);
1559 cancel_delayed_work_sync(&vi->refill);
1560 virtnet_del_vqs(vi);
1562 free_percpu(vi->vq_index);
1564 free_percpu(vi->stats);
1570 static void remove_vq_common(struct virtnet_info *vi)
1572 vi->vdev->config->reset(vi->vdev);
1574 /* Free unused buffers in both send and recv, if any. */
1575 free_unused_bufs(vi);
1577 free_receive_bufs(vi);
1579 virtnet_del_vqs(vi);
1582 static void virtnet_remove(struct virtio_device *vdev)
1584 struct virtnet_info *vi = vdev->priv;
1586 /* Prevent config work handler from accessing the device. */
1587 mutex_lock(&vi->config_lock);
1588 vi->config_enable = false;
1589 mutex_unlock(&vi->config_lock);
1591 unregister_netdev(vi->dev);
1593 remove_vq_common(vi);
1595 flush_work(&vi->config_work);
1597 free_percpu(vi->vq_index);
1598 free_percpu(vi->stats);
1599 free_netdev(vi->dev);
1603 static int virtnet_freeze(struct virtio_device *vdev)
1605 struct virtnet_info *vi = vdev->priv;
1608 /* Prevent config work handler from accessing the device */
1609 mutex_lock(&vi->config_lock);
1610 vi->config_enable = false;
1611 mutex_unlock(&vi->config_lock);
1613 netif_device_detach(vi->dev);
1614 cancel_delayed_work_sync(&vi->refill);
1616 if (netif_running(vi->dev))
1617 for (i = 0; i < vi->max_queue_pairs; i++) {
1618 napi_disable(&vi->rq[i].napi);
1619 netif_napi_del(&vi->rq[i].napi);
1622 remove_vq_common(vi);
1624 flush_work(&vi->config_work);
1629 static int virtnet_restore(struct virtio_device *vdev)
1631 struct virtnet_info *vi = vdev->priv;
1638 if (netif_running(vi->dev))
1639 for (i = 0; i < vi->max_queue_pairs; i++)
1640 virtnet_napi_enable(&vi->rq[i]);
1642 netif_device_attach(vi->dev);
1644 for (i = 0; i < vi->max_queue_pairs; i++)
1645 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
1646 schedule_delayed_work(&vi->refill, 0);
1648 mutex_lock(&vi->config_lock);
1649 vi->config_enable = true;
1650 mutex_unlock(&vi->config_lock);
1652 virtnet_set_queues(vi, vi->curr_queue_pairs);
1658 static struct virtio_device_id id_table[] = {
1659 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1663 static unsigned int features[] = {
1664 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1665 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1666 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1667 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1668 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1669 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1670 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1671 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
1674 static struct virtio_driver virtio_net_driver = {
1675 .feature_table = features,
1676 .feature_table_size = ARRAY_SIZE(features),
1677 .driver.name = KBUILD_MODNAME,
1678 .driver.owner = THIS_MODULE,
1679 .id_table = id_table,
1680 .probe = virtnet_probe,
1681 .remove = virtnet_remove,
1682 .config_changed = virtnet_config_changed,
1684 .freeze = virtnet_freeze,
1685 .restore = virtnet_restore,
1689 static int __init init(void)
1691 return register_virtio_driver(&virtio_net_driver);
1694 static void __exit fini(void)
1696 unregister_virtio_driver(&virtio_net_driver);
1701 MODULE_DEVICE_TABLE(virtio, id_table);
1702 MODULE_DESCRIPTION("Virtio network driver");
1703 MODULE_LICENSE("GPL");