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>
29 #include <linux/cpu.h>
31 static int napi_weight = NAPI_POLL_WEIGHT;
32 module_param(napi_weight, int, 0444);
34 static bool csum = true, gso = true;
35 module_param(csum, bool, 0444);
36 module_param(gso, bool, 0444);
38 /* FIXME: MTU in config. */
39 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
40 #define GOOD_COPY_LEN 128
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;
130 /* CPU hot plug notifier */
131 struct notifier_block nb;
134 struct skb_vnet_hdr {
136 struct virtio_net_hdr hdr;
137 struct virtio_net_hdr_mrg_rxbuf mhdr;
141 struct padded_vnet_hdr {
142 struct virtio_net_hdr hdr;
144 * virtio_net_hdr should be in a separated sg buffer because of a
145 * QEMU bug, and data sg buffer shares same page with this header sg.
146 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
151 /* Converting between virtqueue no. and kernel tx/rx queue no.
152 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
154 static int vq2txq(struct virtqueue *vq)
156 return (vq->index - 1) / 2;
159 static int txq2vq(int txq)
164 static int vq2rxq(struct virtqueue *vq)
166 return vq->index / 2;
169 static int rxq2vq(int rxq)
174 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
176 return (struct skb_vnet_hdr *)skb->cb;
180 * private is used to chain pages for big packets, put the whole
181 * most recent used list in the beginning for reuse
183 static void give_pages(struct receive_queue *rq, struct page *page)
187 /* Find end of list, sew whole thing into vi->rq.pages. */
188 for (end = page; end->private; end = (struct page *)end->private);
189 end->private = (unsigned long)rq->pages;
193 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
195 struct page *p = rq->pages;
198 rq->pages = (struct page *)p->private;
199 /* clear private here, it is used to chain pages */
202 p = alloc_page(gfp_mask);
206 static void skb_xmit_done(struct virtqueue *vq)
208 struct virtnet_info *vi = vq->vdev->priv;
210 /* Suppress further interrupts. */
211 virtqueue_disable_cb(vq);
213 /* We were probably waiting for more output buffers. */
214 netif_wake_subqueue(vi->dev, vq2txq(vq));
217 static void set_skb_frag(struct sk_buff *skb, struct page *page,
218 unsigned int offset, unsigned int *len)
220 int size = min((unsigned)PAGE_SIZE - offset, *len);
221 int i = skb_shinfo(skb)->nr_frags;
223 __skb_fill_page_desc(skb, i, page, offset, size);
225 skb->data_len += size;
227 skb->truesize += PAGE_SIZE;
228 skb_shinfo(skb)->nr_frags++;
229 skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
233 /* Called from bottom half context */
234 static struct sk_buff *page_to_skb(struct receive_queue *rq,
235 struct page *page, unsigned int len)
237 struct virtnet_info *vi = rq->vq->vdev->priv;
239 struct skb_vnet_hdr *hdr;
240 unsigned int copy, hdr_len, offset;
243 p = page_address(page);
245 /* copy small packet so we can reuse these pages for small data */
246 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
250 hdr = skb_vnet_hdr(skb);
252 if (vi->mergeable_rx_bufs) {
253 hdr_len = sizeof hdr->mhdr;
256 hdr_len = sizeof hdr->hdr;
257 offset = sizeof(struct padded_vnet_hdr);
260 memcpy(hdr, p, hdr_len);
266 if (copy > skb_tailroom(skb))
267 copy = skb_tailroom(skb);
268 memcpy(skb_put(skb, copy), p, copy);
274 * Verify that we can indeed put this data into a skb.
275 * This is here to handle cases when the device erroneously
276 * tries to receive more than is possible. This is usually
277 * the case of a broken device.
279 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
280 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
286 set_skb_frag(skb, page, offset, &len);
287 page = (struct page *)page->private;
292 give_pages(rq, page);
297 static struct sk_buff *receive_small(void *buf, unsigned int len)
299 struct sk_buff * skb = buf;
301 len -= sizeof(struct virtio_net_hdr);
307 static struct sk_buff *receive_big(struct net_device *dev,
308 struct receive_queue *rq,
311 struct page *page = buf;
312 struct sk_buff *skb = page_to_skb(rq, page, 0);
320 dev->stats.rx_dropped++;
321 give_pages(rq, page);
325 static struct sk_buff *receive_mergeable(struct net_device *dev,
326 struct receive_queue *rq,
330 struct skb_vnet_hdr *hdr = page_address(buf);
331 int num_buf = hdr->mhdr.num_buffers;
332 struct page *page = buf;
333 struct sk_buff *skb = page_to_skb(rq, page, len);
340 i = skb_shinfo(skb)->nr_frags;
341 if (i >= MAX_SKB_FRAGS) {
342 pr_debug("%s: packet too long\n", skb->dev->name);
343 skb->dev->stats.rx_length_errors++;
346 page = virtqueue_get_buf(rq->vq, &len);
348 pr_debug("%s: rx error: %d buffers %d missing\n",
349 dev->name, hdr->mhdr.num_buffers, num_buf);
350 dev->stats.rx_length_errors++;
357 set_skb_frag(skb, page, 0, &len);
363 give_pages(rq, page);
366 buf = virtqueue_get_buf(rq->vq, &len);
367 if (unlikely(!buf)) {
368 pr_debug("%s: rx error: %d buffers missing\n",
370 dev->stats.rx_length_errors++;
374 give_pages(rq, page);
378 dev->stats.rx_dropped++;
383 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
385 struct virtnet_info *vi = rq->vq->vdev->priv;
386 struct net_device *dev = vi->dev;
387 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
389 struct skb_vnet_hdr *hdr;
391 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
392 pr_debug("%s: short packet %i\n", dev->name, len);
393 dev->stats.rx_length_errors++;
394 if (vi->mergeable_rx_bufs || vi->big_packets)
400 if (vi->mergeable_rx_bufs)
401 skb = receive_mergeable(dev, rq, buf, len);
402 else if (vi->big_packets)
403 skb = receive_big(dev, rq, buf);
405 skb = receive_small(buf, len);
410 hdr = skb_vnet_hdr(skb);
412 u64_stats_update_begin(&stats->rx_syncp);
413 stats->rx_bytes += skb->len;
415 u64_stats_update_end(&stats->rx_syncp);
417 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
418 pr_debug("Needs csum!\n");
419 if (!skb_partial_csum_set(skb,
421 hdr->hdr.csum_offset))
423 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
424 skb->ip_summed = CHECKSUM_UNNECESSARY;
427 skb->protocol = eth_type_trans(skb, dev);
428 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
429 ntohs(skb->protocol), skb->len, skb->pkt_type);
431 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
433 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
434 case VIRTIO_NET_HDR_GSO_TCPV4:
435 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
437 case VIRTIO_NET_HDR_GSO_UDP:
438 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
440 case VIRTIO_NET_HDR_GSO_TCPV6:
441 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
444 net_warn_ratelimited("%s: bad gso type %u.\n",
445 dev->name, hdr->hdr.gso_type);
449 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
450 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
452 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
453 if (skb_shinfo(skb)->gso_size == 0) {
454 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
458 /* Header must be checked, and gso_segs computed. */
459 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
460 skb_shinfo(skb)->gso_segs = 0;
463 netif_receive_skb(skb);
467 dev->stats.rx_frame_errors++;
471 static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
473 struct virtnet_info *vi = rq->vq->vdev->priv;
475 struct skb_vnet_hdr *hdr;
478 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
482 skb_put(skb, MAX_PACKET_LEN);
484 hdr = skb_vnet_hdr(skb);
485 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
487 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
489 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
496 static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
498 struct page *first, *list = NULL;
502 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
503 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
504 first = get_a_page(rq, gfp);
507 give_pages(rq, list);
510 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
512 /* chain new page in list head to match sg */
513 first->private = (unsigned long)list;
517 first = get_a_page(rq, gfp);
519 give_pages(rq, list);
522 p = page_address(first);
524 /* rq->sg[0], rq->sg[1] share the same page */
525 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
526 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
528 /* rq->sg[1] for data packet, from offset */
529 offset = sizeof(struct padded_vnet_hdr);
530 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
532 /* chain first in list head */
533 first->private = (unsigned long)list;
534 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
537 give_pages(rq, first);
542 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
547 page = get_a_page(rq, gfp);
551 sg_init_one(rq->sg, page_address(page), PAGE_SIZE);
553 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, page, gfp);
555 give_pages(rq, page);
561 * Returns false if we couldn't fill entirely (OOM).
563 * Normally run in the receive path, but can also be run from ndo_open
564 * before we're receiving packets, or from refill_work which is
565 * careful to disable receiving (using napi_disable).
567 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
569 struct virtnet_info *vi = rq->vq->vdev->priv;
574 if (vi->mergeable_rx_bufs)
575 err = add_recvbuf_mergeable(rq, gfp);
576 else if (vi->big_packets)
577 err = add_recvbuf_big(rq, gfp);
579 err = add_recvbuf_small(rq, gfp);
581 oom = err == -ENOMEM;
585 } while (rq->vq->num_free);
586 if (unlikely(rq->num > rq->max))
588 virtqueue_kick(rq->vq);
592 static void skb_recv_done(struct virtqueue *rvq)
594 struct virtnet_info *vi = rvq->vdev->priv;
595 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
597 /* Schedule NAPI, Suppress further interrupts if successful. */
598 if (napi_schedule_prep(&rq->napi)) {
599 virtqueue_disable_cb(rvq);
600 __napi_schedule(&rq->napi);
604 static void virtnet_napi_enable(struct receive_queue *rq)
606 napi_enable(&rq->napi);
608 /* If all buffers were filled by other side before we napi_enabled, we
609 * won't get another interrupt, so process any outstanding packets
610 * now. virtnet_poll wants re-enable the queue, so we disable here.
611 * We synchronize against interrupts via NAPI_STATE_SCHED */
612 if (napi_schedule_prep(&rq->napi)) {
613 virtqueue_disable_cb(rq->vq);
615 __napi_schedule(&rq->napi);
620 static void refill_work(struct work_struct *work)
622 struct virtnet_info *vi =
623 container_of(work, struct virtnet_info, refill.work);
627 for (i = 0; i < vi->curr_queue_pairs; i++) {
628 struct receive_queue *rq = &vi->rq[i];
630 napi_disable(&rq->napi);
631 still_empty = !try_fill_recv(rq, GFP_KERNEL);
632 virtnet_napi_enable(rq);
634 /* In theory, this can happen: if we don't get any buffers in
635 * we will *never* try to fill again.
638 schedule_delayed_work(&vi->refill, HZ/2);
642 static int virtnet_poll(struct napi_struct *napi, int budget)
644 struct receive_queue *rq =
645 container_of(napi, struct receive_queue, napi);
646 struct virtnet_info *vi = rq->vq->vdev->priv;
648 unsigned int r, len, received = 0;
651 while (received < budget &&
652 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
653 receive_buf(rq, buf, len);
658 if (rq->num < rq->max / 2) {
659 if (!try_fill_recv(rq, GFP_ATOMIC))
660 schedule_delayed_work(&vi->refill, 0);
663 /* Out of packets? */
664 if (received < budget) {
665 r = virtqueue_enable_cb_prepare(rq->vq);
667 if (unlikely(virtqueue_poll(rq->vq, r)) &&
668 napi_schedule_prep(napi)) {
669 virtqueue_disable_cb(rq->vq);
670 __napi_schedule(napi);
678 static int virtnet_open(struct net_device *dev)
680 struct virtnet_info *vi = netdev_priv(dev);
683 for (i = 0; i < vi->max_queue_pairs; i++) {
684 if (i < vi->curr_queue_pairs)
685 /* Make sure we have some buffers: if oom use wq. */
686 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
687 schedule_delayed_work(&vi->refill, 0);
688 virtnet_napi_enable(&vi->rq[i]);
694 static void free_old_xmit_skbs(struct send_queue *sq)
698 struct virtnet_info *vi = sq->vq->vdev->priv;
699 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
701 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
702 pr_debug("Sent skb %p\n", skb);
704 u64_stats_update_begin(&stats->tx_syncp);
705 stats->tx_bytes += skb->len;
707 u64_stats_update_end(&stats->tx_syncp);
709 dev_kfree_skb_any(skb);
713 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
715 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
716 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
717 struct virtnet_info *vi = sq->vq->vdev->priv;
720 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
722 if (skb->ip_summed == CHECKSUM_PARTIAL) {
723 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
724 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
725 hdr->hdr.csum_offset = skb->csum_offset;
728 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
731 if (skb_is_gso(skb)) {
732 hdr->hdr.hdr_len = skb_headlen(skb);
733 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
734 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
735 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
736 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
737 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
738 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
739 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
742 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
743 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
745 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
746 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
749 hdr->mhdr.num_buffers = 0;
751 /* Encode metadata header at front. */
752 if (vi->mergeable_rx_bufs)
753 sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr);
755 sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr);
757 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
758 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
761 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
763 struct virtnet_info *vi = netdev_priv(dev);
764 int qnum = skb_get_queue_mapping(skb);
765 struct send_queue *sq = &vi->sq[qnum];
768 /* Free up any pending old buffers before queueing new ones. */
769 free_old_xmit_skbs(sq);
771 /* Try to transmit */
772 err = xmit_skb(sq, skb);
774 /* This should not happen! */
776 dev->stats.tx_fifo_errors++;
779 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
780 dev->stats.tx_dropped++;
784 virtqueue_kick(sq->vq);
786 /* Don't wait up for transmitted skbs to be freed. */
790 /* Apparently nice girls don't return TX_BUSY; stop the queue
791 * before it gets out of hand. Naturally, this wastes entries. */
792 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
793 netif_stop_subqueue(dev, qnum);
794 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
795 /* More just got used, free them then recheck. */
796 free_old_xmit_skbs(sq);
797 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
798 netif_start_subqueue(dev, qnum);
799 virtqueue_disable_cb(sq->vq);
808 * Send command via the control virtqueue and check status. Commands
809 * supported by the hypervisor, as indicated by feature bits, should
810 * never fail unless improperly formated.
812 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
813 struct scatterlist *out,
814 struct scatterlist *in)
816 struct scatterlist *sgs[4], hdr, stat;
817 struct virtio_net_ctrl_hdr ctrl;
818 virtio_net_ctrl_ack status = ~0;
819 unsigned out_num = 0, in_num = 0, tmp;
821 /* Caller should know better */
822 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
827 sg_init_one(&hdr, &ctrl, sizeof(ctrl));
828 sgs[out_num++] = &hdr;
831 sgs[out_num++] = out;
833 sgs[out_num + in_num++] = in;
835 /* Add return status. */
836 sg_init_one(&stat, &status, sizeof(status));
837 sgs[out_num + in_num++] = &stat;
839 BUG_ON(out_num + in_num > ARRAY_SIZE(sgs));
840 BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC)
843 virtqueue_kick(vi->cvq);
845 /* Spin for a response, the kick causes an ioport write, trapping
846 * into the hypervisor, so the request should be handled immediately.
848 while (!virtqueue_get_buf(vi->cvq, &tmp))
851 return status == VIRTIO_NET_OK;
854 static int virtnet_set_mac_address(struct net_device *dev, void *p)
856 struct virtnet_info *vi = netdev_priv(dev);
857 struct virtio_device *vdev = vi->vdev;
859 struct sockaddr *addr = p;
860 struct scatterlist sg;
862 ret = eth_prepare_mac_addr_change(dev, p);
866 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
867 sg_init_one(&sg, addr->sa_data, dev->addr_len);
868 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
869 VIRTIO_NET_CTRL_MAC_ADDR_SET,
872 "Failed to set mac address by vq command.\n");
875 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
876 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
877 addr->sa_data, dev->addr_len);
880 eth_commit_mac_addr_change(dev, p);
885 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
886 struct rtnl_link_stats64 *tot)
888 struct virtnet_info *vi = netdev_priv(dev);
892 for_each_possible_cpu(cpu) {
893 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
894 u64 tpackets, tbytes, rpackets, rbytes;
897 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
898 tpackets = stats->tx_packets;
899 tbytes = stats->tx_bytes;
900 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
903 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
904 rpackets = stats->rx_packets;
905 rbytes = stats->rx_bytes;
906 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
908 tot->rx_packets += rpackets;
909 tot->tx_packets += tpackets;
910 tot->rx_bytes += rbytes;
911 tot->tx_bytes += tbytes;
914 tot->tx_dropped = dev->stats.tx_dropped;
915 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
916 tot->rx_dropped = dev->stats.rx_dropped;
917 tot->rx_length_errors = dev->stats.rx_length_errors;
918 tot->rx_frame_errors = dev->stats.rx_frame_errors;
923 #ifdef CONFIG_NET_POLL_CONTROLLER
924 static void virtnet_netpoll(struct net_device *dev)
926 struct virtnet_info *vi = netdev_priv(dev);
929 for (i = 0; i < vi->curr_queue_pairs; i++)
930 napi_schedule(&vi->rq[i].napi);
934 static void virtnet_ack_link_announce(struct virtnet_info *vi)
937 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
938 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL))
939 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
943 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
945 struct scatterlist sg;
946 struct virtio_net_ctrl_mq s;
947 struct net_device *dev = vi->dev;
949 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
952 s.virtqueue_pairs = queue_pairs;
953 sg_init_one(&sg, &s, sizeof(s));
955 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
956 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) {
957 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
961 vi->curr_queue_pairs = queue_pairs;
962 /* virtnet_open() will refill when device is going to up. */
963 if (dev->flags & IFF_UP)
964 schedule_delayed_work(&vi->refill, 0);
970 static int virtnet_close(struct net_device *dev)
972 struct virtnet_info *vi = netdev_priv(dev);
975 /* Make sure refill_work doesn't re-enable napi! */
976 cancel_delayed_work_sync(&vi->refill);
978 for (i = 0; i < vi->max_queue_pairs; i++)
979 napi_disable(&vi->rq[i].napi);
984 static void virtnet_set_rx_mode(struct net_device *dev)
986 struct virtnet_info *vi = netdev_priv(dev);
987 struct scatterlist sg[2];
988 u8 promisc, allmulti;
989 struct virtio_net_ctrl_mac *mac_data;
990 struct netdev_hw_addr *ha;
996 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
997 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1000 promisc = ((dev->flags & IFF_PROMISC) != 0);
1001 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1003 sg_init_one(sg, &promisc, sizeof(promisc));
1005 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1006 VIRTIO_NET_CTRL_RX_PROMISC,
1008 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1009 promisc ? "en" : "dis");
1011 sg_init_one(sg, &allmulti, sizeof(allmulti));
1013 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1014 VIRTIO_NET_CTRL_RX_ALLMULTI,
1016 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1017 allmulti ? "en" : "dis");
1019 uc_count = netdev_uc_count(dev);
1020 mc_count = netdev_mc_count(dev);
1021 /* MAC filter - use one buffer for both lists */
1022 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1023 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1028 sg_init_table(sg, 2);
1030 /* Store the unicast list and count in the front of the buffer */
1031 mac_data->entries = uc_count;
1033 netdev_for_each_uc_addr(ha, dev)
1034 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1036 sg_set_buf(&sg[0], mac_data,
1037 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1039 /* multicast list and count fill the end */
1040 mac_data = (void *)&mac_data->macs[uc_count][0];
1042 mac_data->entries = mc_count;
1044 netdev_for_each_mc_addr(ha, dev)
1045 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1047 sg_set_buf(&sg[1], mac_data,
1048 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1050 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1051 VIRTIO_NET_CTRL_MAC_TABLE_SET,
1053 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
1058 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1059 __be16 proto, u16 vid)
1061 struct virtnet_info *vi = netdev_priv(dev);
1062 struct scatterlist sg;
1064 sg_init_one(&sg, &vid, sizeof(vid));
1066 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1067 VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL))
1068 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1072 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1073 __be16 proto, u16 vid)
1075 struct virtnet_info *vi = netdev_priv(dev);
1076 struct scatterlist sg;
1078 sg_init_one(&sg, &vid, sizeof(vid));
1080 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1081 VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL))
1082 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1086 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1091 if (vi->affinity_hint_set) {
1092 for (i = 0; i < vi->max_queue_pairs; i++) {
1093 virtqueue_set_affinity(vi->rq[i].vq, -1);
1094 virtqueue_set_affinity(vi->sq[i].vq, -1);
1097 vi->affinity_hint_set = false;
1101 for_each_online_cpu(cpu) {
1103 *per_cpu_ptr(vi->vq_index, cpu) = -1;
1105 *per_cpu_ptr(vi->vq_index, cpu) =
1106 ++i % vi->curr_queue_pairs;
1111 static void virtnet_set_affinity(struct virtnet_info *vi)
1116 /* In multiqueue mode, when the number of cpu is equal to the number of
1117 * queue pairs, we let the queue pairs to be private to one cpu by
1118 * setting the affinity hint to eliminate the contention.
1120 if (vi->curr_queue_pairs == 1 ||
1121 vi->max_queue_pairs != num_online_cpus()) {
1122 virtnet_clean_affinity(vi, -1);
1127 for_each_online_cpu(cpu) {
1128 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1129 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1130 *per_cpu_ptr(vi->vq_index, cpu) = i;
1134 vi->affinity_hint_set = true;
1137 static int virtnet_cpu_callback(struct notifier_block *nfb,
1138 unsigned long action, void *hcpu)
1140 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
1142 switch(action & ~CPU_TASKS_FROZEN) {
1144 case CPU_DOWN_FAILED:
1146 virtnet_set_affinity(vi);
1148 case CPU_DOWN_PREPARE:
1149 virtnet_clean_affinity(vi, (long)hcpu);
1158 static void virtnet_get_ringparam(struct net_device *dev,
1159 struct ethtool_ringparam *ring)
1161 struct virtnet_info *vi = netdev_priv(dev);
1163 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1164 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1165 ring->rx_pending = ring->rx_max_pending;
1166 ring->tx_pending = ring->tx_max_pending;
1170 static void virtnet_get_drvinfo(struct net_device *dev,
1171 struct ethtool_drvinfo *info)
1173 struct virtnet_info *vi = netdev_priv(dev);
1174 struct virtio_device *vdev = vi->vdev;
1176 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1177 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1178 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1182 /* TODO: Eliminate OOO packets during switching */
1183 static int virtnet_set_channels(struct net_device *dev,
1184 struct ethtool_channels *channels)
1186 struct virtnet_info *vi = netdev_priv(dev);
1187 u16 queue_pairs = channels->combined_count;
1190 /* We don't support separate rx/tx channels.
1191 * We don't allow setting 'other' channels.
1193 if (channels->rx_count || channels->tx_count || channels->other_count)
1196 if (queue_pairs > vi->max_queue_pairs)
1200 err = virtnet_set_queues(vi, queue_pairs);
1202 netif_set_real_num_tx_queues(dev, queue_pairs);
1203 netif_set_real_num_rx_queues(dev, queue_pairs);
1205 virtnet_set_affinity(vi);
1212 static void virtnet_get_channels(struct net_device *dev,
1213 struct ethtool_channels *channels)
1215 struct virtnet_info *vi = netdev_priv(dev);
1217 channels->combined_count = vi->curr_queue_pairs;
1218 channels->max_combined = vi->max_queue_pairs;
1219 channels->max_other = 0;
1220 channels->rx_count = 0;
1221 channels->tx_count = 0;
1222 channels->other_count = 0;
1225 static const struct ethtool_ops virtnet_ethtool_ops = {
1226 .get_drvinfo = virtnet_get_drvinfo,
1227 .get_link = ethtool_op_get_link,
1228 .get_ringparam = virtnet_get_ringparam,
1229 .set_channels = virtnet_set_channels,
1230 .get_channels = virtnet_get_channels,
1234 #define MAX_MTU 65535
1236 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1238 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1244 /* To avoid contending a lock hold by a vcpu who would exit to host, select the
1245 * txq based on the processor id.
1247 static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
1250 struct virtnet_info *vi = netdev_priv(dev);
1252 if (skb_rx_queue_recorded(skb)) {
1253 txq = skb_get_rx_queue(skb);
1255 txq = *__this_cpu_ptr(vi->vq_index);
1260 while (unlikely(txq >= dev->real_num_tx_queues))
1261 txq -= dev->real_num_tx_queues;
1266 static const struct net_device_ops virtnet_netdev = {
1267 .ndo_open = virtnet_open,
1268 .ndo_stop = virtnet_close,
1269 .ndo_start_xmit = start_xmit,
1270 .ndo_validate_addr = eth_validate_addr,
1271 .ndo_set_mac_address = virtnet_set_mac_address,
1272 .ndo_set_rx_mode = virtnet_set_rx_mode,
1273 .ndo_change_mtu = virtnet_change_mtu,
1274 .ndo_get_stats64 = virtnet_stats,
1275 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1276 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1277 .ndo_select_queue = virtnet_select_queue,
1278 #ifdef CONFIG_NET_POLL_CONTROLLER
1279 .ndo_poll_controller = virtnet_netpoll,
1283 static void virtnet_config_changed_work(struct work_struct *work)
1285 struct virtnet_info *vi =
1286 container_of(work, struct virtnet_info, config_work);
1289 mutex_lock(&vi->config_lock);
1290 if (!vi->config_enable)
1293 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
1294 offsetof(struct virtio_net_config, status),
1298 if (v & VIRTIO_NET_S_ANNOUNCE) {
1299 netdev_notify_peers(vi->dev);
1300 virtnet_ack_link_announce(vi);
1303 /* Ignore unknown (future) status bits */
1304 v &= VIRTIO_NET_S_LINK_UP;
1306 if (vi->status == v)
1311 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1312 netif_carrier_on(vi->dev);
1313 netif_tx_wake_all_queues(vi->dev);
1315 netif_carrier_off(vi->dev);
1316 netif_tx_stop_all_queues(vi->dev);
1319 mutex_unlock(&vi->config_lock);
1322 static void virtnet_config_changed(struct virtio_device *vdev)
1324 struct virtnet_info *vi = vdev->priv;
1326 schedule_work(&vi->config_work);
1329 static void virtnet_free_queues(struct virtnet_info *vi)
1333 for (i = 0; i < vi->max_queue_pairs; i++)
1334 netif_napi_del(&vi->rq[i].napi);
1340 static void free_receive_bufs(struct virtnet_info *vi)
1344 for (i = 0; i < vi->max_queue_pairs; i++) {
1345 while (vi->rq[i].pages)
1346 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1350 static void free_unused_bufs(struct virtnet_info *vi)
1355 for (i = 0; i < vi->max_queue_pairs; i++) {
1356 struct virtqueue *vq = vi->sq[i].vq;
1357 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1361 for (i = 0; i < vi->max_queue_pairs; i++) {
1362 struct virtqueue *vq = vi->rq[i].vq;
1364 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1365 if (vi->mergeable_rx_bufs || vi->big_packets)
1366 give_pages(&vi->rq[i], buf);
1371 BUG_ON(vi->rq[i].num != 0);
1375 static void virtnet_del_vqs(struct virtnet_info *vi)
1377 struct virtio_device *vdev = vi->vdev;
1379 virtnet_clean_affinity(vi, -1);
1381 vdev->config->del_vqs(vdev);
1383 virtnet_free_queues(vi);
1386 static int virtnet_find_vqs(struct virtnet_info *vi)
1388 vq_callback_t **callbacks;
1389 struct virtqueue **vqs;
1394 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1395 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1396 * possible control vq.
1398 total_vqs = vi->max_queue_pairs * 2 +
1399 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1401 /* Allocate space for find_vqs parameters */
1402 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1405 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1408 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1412 /* Parameters for control virtqueue, if any */
1414 callbacks[total_vqs - 1] = NULL;
1415 names[total_vqs - 1] = "control";
1418 /* Allocate/initialize parameters for send/receive virtqueues */
1419 for (i = 0; i < vi->max_queue_pairs; i++) {
1420 callbacks[rxq2vq(i)] = skb_recv_done;
1421 callbacks[txq2vq(i)] = skb_xmit_done;
1422 sprintf(vi->rq[i].name, "input.%d", i);
1423 sprintf(vi->sq[i].name, "output.%d", i);
1424 names[rxq2vq(i)] = vi->rq[i].name;
1425 names[txq2vq(i)] = vi->sq[i].name;
1428 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1434 vi->cvq = vqs[total_vqs - 1];
1435 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1436 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1439 for (i = 0; i < vi->max_queue_pairs; i++) {
1440 vi->rq[i].vq = vqs[rxq2vq(i)];
1441 vi->sq[i].vq = vqs[txq2vq(i)];
1460 static int virtnet_alloc_queues(struct virtnet_info *vi)
1464 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1467 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1471 INIT_DELAYED_WORK(&vi->refill, refill_work);
1472 for (i = 0; i < vi->max_queue_pairs; i++) {
1473 vi->rq[i].pages = NULL;
1474 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1477 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1478 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1489 static int init_vqs(struct virtnet_info *vi)
1493 /* Allocate send & receive queues */
1494 ret = virtnet_alloc_queues(vi);
1498 ret = virtnet_find_vqs(vi);
1503 virtnet_set_affinity(vi);
1509 virtnet_free_queues(vi);
1514 static int virtnet_probe(struct virtio_device *vdev)
1517 struct net_device *dev;
1518 struct virtnet_info *vi;
1519 u16 max_queue_pairs;
1521 /* Find if host supports multiqueue virtio_net device */
1522 err = virtio_config_val(vdev, VIRTIO_NET_F_MQ,
1523 offsetof(struct virtio_net_config,
1524 max_virtqueue_pairs), &max_queue_pairs);
1526 /* We need at least 2 queue's */
1527 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1528 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1529 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1530 max_queue_pairs = 1;
1532 /* Allocate ourselves a network device with room for our info */
1533 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1537 /* Set up network device as normal. */
1538 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1539 dev->netdev_ops = &virtnet_netdev;
1540 dev->features = NETIF_F_HIGHDMA;
1542 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1543 SET_NETDEV_DEV(dev, &vdev->dev);
1545 /* Do we support "hardware" checksums? */
1546 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1547 /* This opens up the world of extra features. */
1548 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1550 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1552 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1553 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1554 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1556 /* Individual feature bits: what can host handle? */
1557 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1558 dev->hw_features |= NETIF_F_TSO;
1559 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1560 dev->hw_features |= NETIF_F_TSO6;
1561 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1562 dev->hw_features |= NETIF_F_TSO_ECN;
1563 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1564 dev->hw_features |= NETIF_F_UFO;
1567 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1568 /* (!csum && gso) case will be fixed by register_netdev() */
1571 dev->vlan_features = dev->features;
1573 /* Configuration may specify what MAC to use. Otherwise random. */
1574 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1575 offsetof(struct virtio_net_config, mac),
1576 dev->dev_addr, dev->addr_len) < 0)
1577 eth_hw_addr_random(dev);
1579 /* Set up our device-specific information */
1580 vi = netdev_priv(dev);
1584 vi->stats = alloc_percpu(struct virtnet_stats);
1586 if (vi->stats == NULL)
1589 vi->vq_index = alloc_percpu(int);
1590 if (vi->vq_index == NULL)
1593 mutex_init(&vi->config_lock);
1594 vi->config_enable = true;
1595 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1597 /* If we can receive ANY GSO packets, we must allocate large ones. */
1598 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1599 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1600 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
1601 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
1602 vi->big_packets = true;
1604 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1605 vi->mergeable_rx_bufs = true;
1607 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1610 /* Use single tx/rx queue pair as default */
1611 vi->curr_queue_pairs = 1;
1612 vi->max_queue_pairs = max_queue_pairs;
1614 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1619 netif_set_real_num_tx_queues(dev, 1);
1620 netif_set_real_num_rx_queues(dev, 1);
1622 err = register_netdev(dev);
1624 pr_debug("virtio_net: registering device failed\n");
1628 /* Last of all, set up some receive buffers. */
1629 for (i = 0; i < vi->curr_queue_pairs; i++) {
1630 try_fill_recv(&vi->rq[i], GFP_KERNEL);
1632 /* If we didn't even get one input buffer, we're useless. */
1633 if (vi->rq[i].num == 0) {
1634 free_unused_bufs(vi);
1636 goto free_recv_bufs;
1640 vi->nb.notifier_call = &virtnet_cpu_callback;
1641 err = register_hotcpu_notifier(&vi->nb);
1643 pr_debug("virtio_net: registering cpu notifier failed\n");
1644 goto free_recv_bufs;
1647 /* Assume link up if device can't report link status,
1648 otherwise get link status from config. */
1649 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1650 netif_carrier_off(dev);
1651 schedule_work(&vi->config_work);
1653 vi->status = VIRTIO_NET_S_LINK_UP;
1654 netif_carrier_on(dev);
1657 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1658 dev->name, max_queue_pairs);
1663 free_receive_bufs(vi);
1664 unregister_netdev(dev);
1666 cancel_delayed_work_sync(&vi->refill);
1667 virtnet_del_vqs(vi);
1669 free_percpu(vi->vq_index);
1671 free_percpu(vi->stats);
1677 static void remove_vq_common(struct virtnet_info *vi)
1679 vi->vdev->config->reset(vi->vdev);
1681 /* Free unused buffers in both send and recv, if any. */
1682 free_unused_bufs(vi);
1684 free_receive_bufs(vi);
1686 virtnet_del_vqs(vi);
1689 static void virtnet_remove(struct virtio_device *vdev)
1691 struct virtnet_info *vi = vdev->priv;
1693 unregister_hotcpu_notifier(&vi->nb);
1695 /* Prevent config work handler from accessing the device. */
1696 mutex_lock(&vi->config_lock);
1697 vi->config_enable = false;
1698 mutex_unlock(&vi->config_lock);
1700 unregister_netdev(vi->dev);
1702 remove_vq_common(vi);
1704 flush_work(&vi->config_work);
1706 free_percpu(vi->vq_index);
1707 free_percpu(vi->stats);
1708 free_netdev(vi->dev);
1712 static int virtnet_freeze(struct virtio_device *vdev)
1714 struct virtnet_info *vi = vdev->priv;
1717 unregister_hotcpu_notifier(&vi->nb);
1719 /* Prevent config work handler from accessing the device */
1720 mutex_lock(&vi->config_lock);
1721 vi->config_enable = false;
1722 mutex_unlock(&vi->config_lock);
1724 netif_device_detach(vi->dev);
1725 cancel_delayed_work_sync(&vi->refill);
1727 if (netif_running(vi->dev))
1728 for (i = 0; i < vi->max_queue_pairs; i++) {
1729 napi_disable(&vi->rq[i].napi);
1730 netif_napi_del(&vi->rq[i].napi);
1733 remove_vq_common(vi);
1735 flush_work(&vi->config_work);
1740 static int virtnet_restore(struct virtio_device *vdev)
1742 struct virtnet_info *vi = vdev->priv;
1749 if (netif_running(vi->dev)) {
1750 for (i = 0; i < vi->curr_queue_pairs; i++)
1751 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
1752 schedule_delayed_work(&vi->refill, 0);
1754 for (i = 0; i < vi->max_queue_pairs; i++)
1755 virtnet_napi_enable(&vi->rq[i]);
1758 netif_device_attach(vi->dev);
1760 mutex_lock(&vi->config_lock);
1761 vi->config_enable = true;
1762 mutex_unlock(&vi->config_lock);
1765 virtnet_set_queues(vi, vi->curr_queue_pairs);
1768 err = register_hotcpu_notifier(&vi->nb);
1776 static struct virtio_device_id id_table[] = {
1777 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1781 static unsigned int features[] = {
1782 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1783 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1784 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1785 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1786 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1787 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1788 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1789 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
1790 VIRTIO_NET_F_CTRL_MAC_ADDR,
1793 static struct virtio_driver virtio_net_driver = {
1794 .feature_table = features,
1795 .feature_table_size = ARRAY_SIZE(features),
1796 .driver.name = KBUILD_MODNAME,
1797 .driver.owner = THIS_MODULE,
1798 .id_table = id_table,
1799 .probe = virtnet_probe,
1800 .remove = virtnet_remove,
1801 .config_changed = virtnet_config_changed,
1803 .freeze = virtnet_freeze,
1804 .restore = virtnet_restore,
1808 module_virtio_driver(virtio_net_driver);
1810 MODULE_DEVICE_TABLE(virtio, id_table);
1811 MODULE_DESCRIPTION("Virtio network driver");
1812 MODULE_LICENSE("GPL");