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 = 128;
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 (virtqueue_get_queue_index(vq) - 1) / 2;
159 static int txq2vq(int txq)
164 static int vq2rxq(struct virtqueue *vq)
166 return virtqueue_get_queue_index(vq) / 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 int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb)
299 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
303 num_buf = hdr->mhdr.num_buffers;
305 i = skb_shinfo(skb)->nr_frags;
306 if (i >= MAX_SKB_FRAGS) {
307 pr_debug("%s: packet too long\n", skb->dev->name);
308 skb->dev->stats.rx_length_errors++;
311 page = virtqueue_get_buf(rq->vq, &len);
313 pr_debug("%s: rx error: %d buffers missing\n",
314 skb->dev->name, hdr->mhdr.num_buffers);
315 skb->dev->stats.rx_length_errors++;
322 set_skb_frag(skb, page, 0, &len);
329 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
331 struct virtnet_info *vi = rq->vq->vdev->priv;
332 struct net_device *dev = vi->dev;
333 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
336 struct skb_vnet_hdr *hdr;
338 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
339 pr_debug("%s: short packet %i\n", dev->name, len);
340 dev->stats.rx_length_errors++;
341 if (vi->mergeable_rx_bufs || vi->big_packets)
348 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
350 len -= sizeof(struct virtio_net_hdr);
354 skb = page_to_skb(rq, page, len);
355 if (unlikely(!skb)) {
356 dev->stats.rx_dropped++;
357 give_pages(rq, page);
360 if (vi->mergeable_rx_bufs)
361 if (receive_mergeable(rq, skb)) {
367 hdr = skb_vnet_hdr(skb);
369 u64_stats_update_begin(&stats->rx_syncp);
370 stats->rx_bytes += skb->len;
372 u64_stats_update_end(&stats->rx_syncp);
374 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
375 pr_debug("Needs csum!\n");
376 if (!skb_partial_csum_set(skb,
378 hdr->hdr.csum_offset))
380 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
381 skb->ip_summed = CHECKSUM_UNNECESSARY;
384 skb->protocol = eth_type_trans(skb, dev);
385 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
386 ntohs(skb->protocol), skb->len, skb->pkt_type);
388 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
390 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
391 case VIRTIO_NET_HDR_GSO_TCPV4:
392 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
394 case VIRTIO_NET_HDR_GSO_UDP:
395 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
397 case VIRTIO_NET_HDR_GSO_TCPV6:
398 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
401 net_warn_ratelimited("%s: bad gso type %u.\n",
402 dev->name, hdr->hdr.gso_type);
406 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
407 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
409 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
410 if (skb_shinfo(skb)->gso_size == 0) {
411 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
415 /* Header must be checked, and gso_segs computed. */
416 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
417 skb_shinfo(skb)->gso_segs = 0;
420 netif_receive_skb(skb);
424 dev->stats.rx_frame_errors++;
428 static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
430 struct virtnet_info *vi = rq->vq->vdev->priv;
432 struct skb_vnet_hdr *hdr;
435 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
439 skb_put(skb, MAX_PACKET_LEN);
441 hdr = skb_vnet_hdr(skb);
442 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
444 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
446 err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp);
453 static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
455 struct page *first, *list = NULL;
459 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
460 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
461 first = get_a_page(rq, gfp);
464 give_pages(rq, list);
467 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
469 /* chain new page in list head to match sg */
470 first->private = (unsigned long)list;
474 first = get_a_page(rq, gfp);
476 give_pages(rq, list);
479 p = page_address(first);
481 /* rq->sg[0], rq->sg[1] share the same page */
482 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
483 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
485 /* rq->sg[1] for data packet, from offset */
486 offset = sizeof(struct padded_vnet_hdr);
487 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
489 /* chain first in list head */
490 first->private = (unsigned long)list;
491 err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2,
494 give_pages(rq, first);
499 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
504 page = get_a_page(rq, gfp);
508 sg_init_one(rq->sg, page_address(page), PAGE_SIZE);
510 err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp);
512 give_pages(rq, page);
518 * Returns false if we couldn't fill entirely (OOM).
520 * Normally run in the receive path, but can also be run from ndo_open
521 * before we're receiving packets, or from refill_work which is
522 * careful to disable receiving (using napi_disable).
524 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
526 struct virtnet_info *vi = rq->vq->vdev->priv;
531 if (vi->mergeable_rx_bufs)
532 err = add_recvbuf_mergeable(rq, gfp);
533 else if (vi->big_packets)
534 err = add_recvbuf_big(rq, gfp);
536 err = add_recvbuf_small(rq, gfp);
538 oom = err == -ENOMEM;
542 } while (rq->vq->num_free);
543 if (unlikely(rq->num > rq->max))
545 virtqueue_kick(rq->vq);
549 static void skb_recv_done(struct virtqueue *rvq)
551 struct virtnet_info *vi = rvq->vdev->priv;
552 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
554 /* Schedule NAPI, Suppress further interrupts if successful. */
555 if (napi_schedule_prep(&rq->napi)) {
556 virtqueue_disable_cb(rvq);
557 __napi_schedule(&rq->napi);
561 static void virtnet_napi_enable(struct receive_queue *rq)
563 napi_enable(&rq->napi);
565 /* If all buffers were filled by other side before we napi_enabled, we
566 * won't get another interrupt, so process any outstanding packets
567 * now. virtnet_poll wants re-enable the queue, so we disable here.
568 * We synchronize against interrupts via NAPI_STATE_SCHED */
569 if (napi_schedule_prep(&rq->napi)) {
570 virtqueue_disable_cb(rq->vq);
572 __napi_schedule(&rq->napi);
577 static void refill_work(struct work_struct *work)
579 struct virtnet_info *vi =
580 container_of(work, struct virtnet_info, refill.work);
584 for (i = 0; i < vi->max_queue_pairs; i++) {
585 struct receive_queue *rq = &vi->rq[i];
587 napi_disable(&rq->napi);
588 still_empty = !try_fill_recv(rq, GFP_KERNEL);
589 virtnet_napi_enable(rq);
591 /* In theory, this can happen: if we don't get any buffers in
592 * we will *never* try to fill again.
595 schedule_delayed_work(&vi->refill, HZ/2);
599 static int virtnet_poll(struct napi_struct *napi, int budget)
601 struct receive_queue *rq =
602 container_of(napi, struct receive_queue, napi);
603 struct virtnet_info *vi = rq->vq->vdev->priv;
605 unsigned int len, received = 0;
608 while (received < budget &&
609 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
610 receive_buf(rq, buf, len);
615 if (rq->num < rq->max / 2) {
616 if (!try_fill_recv(rq, GFP_ATOMIC))
617 schedule_delayed_work(&vi->refill, 0);
620 /* Out of packets? */
621 if (received < budget) {
623 if (unlikely(!virtqueue_enable_cb(rq->vq)) &&
624 napi_schedule_prep(napi)) {
625 virtqueue_disable_cb(rq->vq);
626 __napi_schedule(napi);
634 static int virtnet_open(struct net_device *dev)
636 struct virtnet_info *vi = netdev_priv(dev);
639 for (i = 0; i < vi->max_queue_pairs; i++) {
640 /* Make sure we have some buffers: if oom use wq. */
641 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
642 schedule_delayed_work(&vi->refill, 0);
643 virtnet_napi_enable(&vi->rq[i]);
649 static void free_old_xmit_skbs(struct send_queue *sq)
653 struct virtnet_info *vi = sq->vq->vdev->priv;
654 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
656 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
657 pr_debug("Sent skb %p\n", skb);
659 u64_stats_update_begin(&stats->tx_syncp);
660 stats->tx_bytes += skb->len;
662 u64_stats_update_end(&stats->tx_syncp);
664 dev_kfree_skb_any(skb);
668 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
670 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
671 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
672 struct virtnet_info *vi = sq->vq->vdev->priv;
675 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
677 if (skb->ip_summed == CHECKSUM_PARTIAL) {
678 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
679 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
680 hdr->hdr.csum_offset = skb->csum_offset;
683 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
686 if (skb_is_gso(skb)) {
687 hdr->hdr.hdr_len = skb_headlen(skb);
688 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
689 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
690 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
691 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
692 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
693 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
694 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
697 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
698 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
700 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
701 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
704 hdr->mhdr.num_buffers = 0;
706 /* Encode metadata header at front. */
707 if (vi->mergeable_rx_bufs)
708 sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr);
710 sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr);
712 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
713 return virtqueue_add_buf(sq->vq, sq->sg, num_sg,
717 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
719 struct virtnet_info *vi = netdev_priv(dev);
720 int qnum = skb_get_queue_mapping(skb);
721 struct send_queue *sq = &vi->sq[qnum];
724 /* Free up any pending old buffers before queueing new ones. */
725 free_old_xmit_skbs(sq);
727 /* Try to transmit */
728 err = xmit_skb(sq, skb);
730 /* This should not happen! */
732 dev->stats.tx_fifo_errors++;
735 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
736 dev->stats.tx_dropped++;
740 virtqueue_kick(sq->vq);
742 /* Don't wait up for transmitted skbs to be freed. */
746 /* Apparently nice girls don't return TX_BUSY; stop the queue
747 * before it gets out of hand. Naturally, this wastes entries. */
748 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
749 netif_stop_subqueue(dev, qnum);
750 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
751 /* More just got used, free them then recheck. */
752 free_old_xmit_skbs(sq);
753 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
754 netif_start_subqueue(dev, qnum);
755 virtqueue_disable_cb(sq->vq);
764 * Send command via the control virtqueue and check status. Commands
765 * supported by the hypervisor, as indicated by feature bits, should
766 * never fail unless improperly formated.
768 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
769 struct scatterlist *out,
770 struct scatterlist *in)
772 struct scatterlist *sgs[4], hdr, stat;
773 struct virtio_net_ctrl_hdr ctrl;
774 virtio_net_ctrl_ack status = ~0;
775 unsigned out_num = 0, in_num = 0, tmp;
777 /* Caller should know better */
778 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
783 sg_init_one(&hdr, &ctrl, sizeof(ctrl));
784 sgs[out_num++] = &hdr;
787 sgs[out_num++] = out;
789 sgs[out_num + in_num++] = in;
791 /* Add return status. */
792 sg_init_one(&stat, &status, sizeof(status));
793 sgs[out_num + in_num++] = &stat;
795 BUG_ON(out_num + in_num > ARRAY_SIZE(sgs));
796 BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC)
799 virtqueue_kick(vi->cvq);
801 /* Spin for a response, the kick causes an ioport write, trapping
802 * into the hypervisor, so the request should be handled immediately.
804 while (!virtqueue_get_buf(vi->cvq, &tmp))
807 return status == VIRTIO_NET_OK;
810 static int virtnet_set_mac_address(struct net_device *dev, void *p)
812 struct virtnet_info *vi = netdev_priv(dev);
813 struct virtio_device *vdev = vi->vdev;
815 struct sockaddr *addr = p;
816 struct scatterlist sg;
818 ret = eth_prepare_mac_addr_change(dev, p);
822 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
823 sg_init_one(&sg, addr->sa_data, dev->addr_len);
824 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
825 VIRTIO_NET_CTRL_MAC_ADDR_SET,
828 "Failed to set mac address by vq command.\n");
831 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
832 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
833 addr->sa_data, dev->addr_len);
836 eth_commit_mac_addr_change(dev, p);
841 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
842 struct rtnl_link_stats64 *tot)
844 struct virtnet_info *vi = netdev_priv(dev);
848 for_each_possible_cpu(cpu) {
849 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
850 u64 tpackets, tbytes, rpackets, rbytes;
853 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
854 tpackets = stats->tx_packets;
855 tbytes = stats->tx_bytes;
856 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
859 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
860 rpackets = stats->rx_packets;
861 rbytes = stats->rx_bytes;
862 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
864 tot->rx_packets += rpackets;
865 tot->tx_packets += tpackets;
866 tot->rx_bytes += rbytes;
867 tot->tx_bytes += tbytes;
870 tot->tx_dropped = dev->stats.tx_dropped;
871 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
872 tot->rx_dropped = dev->stats.rx_dropped;
873 tot->rx_length_errors = dev->stats.rx_length_errors;
874 tot->rx_frame_errors = dev->stats.rx_frame_errors;
879 #ifdef CONFIG_NET_POLL_CONTROLLER
880 static void virtnet_netpoll(struct net_device *dev)
882 struct virtnet_info *vi = netdev_priv(dev);
885 for (i = 0; i < vi->curr_queue_pairs; i++)
886 napi_schedule(&vi->rq[i].napi);
890 static void virtnet_ack_link_announce(struct virtnet_info *vi)
893 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
894 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL))
895 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
899 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
901 struct scatterlist sg;
902 struct virtio_net_ctrl_mq s;
903 struct net_device *dev = vi->dev;
905 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
908 s.virtqueue_pairs = queue_pairs;
909 sg_init_one(&sg, &s, sizeof(s));
911 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
912 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) {
913 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
917 vi->curr_queue_pairs = queue_pairs;
922 static int virtnet_close(struct net_device *dev)
924 struct virtnet_info *vi = netdev_priv(dev);
927 /* Make sure refill_work doesn't re-enable napi! */
928 cancel_delayed_work_sync(&vi->refill);
930 for (i = 0; i < vi->max_queue_pairs; i++)
931 napi_disable(&vi->rq[i].napi);
936 static void virtnet_set_rx_mode(struct net_device *dev)
938 struct virtnet_info *vi = netdev_priv(dev);
939 struct scatterlist sg[2];
940 u8 promisc, allmulti;
941 struct virtio_net_ctrl_mac *mac_data;
942 struct netdev_hw_addr *ha;
948 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
949 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
952 promisc = ((dev->flags & IFF_PROMISC) != 0);
953 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
955 sg_init_one(sg, &promisc, sizeof(promisc));
957 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
958 VIRTIO_NET_CTRL_RX_PROMISC,
960 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
961 promisc ? "en" : "dis");
963 sg_init_one(sg, &allmulti, sizeof(allmulti));
965 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
966 VIRTIO_NET_CTRL_RX_ALLMULTI,
968 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
969 allmulti ? "en" : "dis");
971 uc_count = netdev_uc_count(dev);
972 mc_count = netdev_mc_count(dev);
973 /* MAC filter - use one buffer for both lists */
974 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
975 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
980 sg_init_table(sg, 2);
982 /* Store the unicast list and count in the front of the buffer */
983 mac_data->entries = uc_count;
985 netdev_for_each_uc_addr(ha, dev)
986 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
988 sg_set_buf(&sg[0], mac_data,
989 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
991 /* multicast list and count fill the end */
992 mac_data = (void *)&mac_data->macs[uc_count][0];
994 mac_data->entries = mc_count;
996 netdev_for_each_mc_addr(ha, dev)
997 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
999 sg_set_buf(&sg[1], mac_data,
1000 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1002 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1003 VIRTIO_NET_CTRL_MAC_TABLE_SET,
1005 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
1010 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
1012 struct virtnet_info *vi = netdev_priv(dev);
1013 struct scatterlist sg;
1015 sg_init_one(&sg, &vid, sizeof(vid));
1017 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1018 VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL))
1019 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1023 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
1025 struct virtnet_info *vi = netdev_priv(dev);
1026 struct scatterlist sg;
1028 sg_init_one(&sg, &vid, sizeof(vid));
1030 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1031 VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL))
1032 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1036 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
1041 if (vi->affinity_hint_set) {
1042 for (i = 0; i < vi->max_queue_pairs; i++) {
1043 virtqueue_set_affinity(vi->rq[i].vq, -1);
1044 virtqueue_set_affinity(vi->sq[i].vq, -1);
1047 vi->affinity_hint_set = false;
1051 for_each_online_cpu(cpu) {
1053 *per_cpu_ptr(vi->vq_index, cpu) = -1;
1055 *per_cpu_ptr(vi->vq_index, cpu) =
1056 ++i % vi->curr_queue_pairs;
1061 static void virtnet_set_affinity(struct virtnet_info *vi)
1066 /* In multiqueue mode, when the number of cpu is equal to the number of
1067 * queue pairs, we let the queue pairs to be private to one cpu by
1068 * setting the affinity hint to eliminate the contention.
1070 if (vi->curr_queue_pairs == 1 ||
1071 vi->max_queue_pairs != num_online_cpus()) {
1072 virtnet_clean_affinity(vi, -1);
1077 for_each_online_cpu(cpu) {
1078 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1079 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1080 *per_cpu_ptr(vi->vq_index, cpu) = i;
1084 vi->affinity_hint_set = true;
1087 static int virtnet_cpu_callback(struct notifier_block *nfb,
1088 unsigned long action, void *hcpu)
1090 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
1092 switch(action & ~CPU_TASKS_FROZEN) {
1094 case CPU_DOWN_FAILED:
1096 virtnet_set_affinity(vi);
1098 case CPU_DOWN_PREPARE:
1099 virtnet_clean_affinity(vi, (long)hcpu);
1107 static void virtnet_get_ringparam(struct net_device *dev,
1108 struct ethtool_ringparam *ring)
1110 struct virtnet_info *vi = netdev_priv(dev);
1112 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1113 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1114 ring->rx_pending = ring->rx_max_pending;
1115 ring->tx_pending = ring->tx_max_pending;
1119 static void virtnet_get_drvinfo(struct net_device *dev,
1120 struct ethtool_drvinfo *info)
1122 struct virtnet_info *vi = netdev_priv(dev);
1123 struct virtio_device *vdev = vi->vdev;
1125 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1126 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1127 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1131 /* TODO: Eliminate OOO packets during switching */
1132 static int virtnet_set_channels(struct net_device *dev,
1133 struct ethtool_channels *channels)
1135 struct virtnet_info *vi = netdev_priv(dev);
1136 u16 queue_pairs = channels->combined_count;
1139 /* We don't support separate rx/tx channels.
1140 * We don't allow setting 'other' channels.
1142 if (channels->rx_count || channels->tx_count || channels->other_count)
1145 if (queue_pairs > vi->max_queue_pairs)
1149 err = virtnet_set_queues(vi, queue_pairs);
1151 netif_set_real_num_tx_queues(dev, queue_pairs);
1152 netif_set_real_num_rx_queues(dev, queue_pairs);
1154 virtnet_set_affinity(vi);
1161 static void virtnet_get_channels(struct net_device *dev,
1162 struct ethtool_channels *channels)
1164 struct virtnet_info *vi = netdev_priv(dev);
1166 channels->combined_count = vi->curr_queue_pairs;
1167 channels->max_combined = vi->max_queue_pairs;
1168 channels->max_other = 0;
1169 channels->rx_count = 0;
1170 channels->tx_count = 0;
1171 channels->other_count = 0;
1174 static const struct ethtool_ops virtnet_ethtool_ops = {
1175 .get_drvinfo = virtnet_get_drvinfo,
1176 .get_link = ethtool_op_get_link,
1177 .get_ringparam = virtnet_get_ringparam,
1178 .set_channels = virtnet_set_channels,
1179 .get_channels = virtnet_get_channels,
1183 #define MAX_MTU 65535
1185 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1187 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1193 /* To avoid contending a lock hold by a vcpu who would exit to host, select the
1194 * txq based on the processor id.
1196 static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
1199 struct virtnet_info *vi = netdev_priv(dev);
1201 if (skb_rx_queue_recorded(skb)) {
1202 txq = skb_get_rx_queue(skb);
1204 txq = *__this_cpu_ptr(vi->vq_index);
1209 while (unlikely(txq >= dev->real_num_tx_queues))
1210 txq -= dev->real_num_tx_queues;
1215 static const struct net_device_ops virtnet_netdev = {
1216 .ndo_open = virtnet_open,
1217 .ndo_stop = virtnet_close,
1218 .ndo_start_xmit = start_xmit,
1219 .ndo_validate_addr = eth_validate_addr,
1220 .ndo_set_mac_address = virtnet_set_mac_address,
1221 .ndo_set_rx_mode = virtnet_set_rx_mode,
1222 .ndo_change_mtu = virtnet_change_mtu,
1223 .ndo_get_stats64 = virtnet_stats,
1224 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1225 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1226 .ndo_select_queue = virtnet_select_queue,
1227 #ifdef CONFIG_NET_POLL_CONTROLLER
1228 .ndo_poll_controller = virtnet_netpoll,
1232 static void virtnet_config_changed_work(struct work_struct *work)
1234 struct virtnet_info *vi =
1235 container_of(work, struct virtnet_info, config_work);
1238 mutex_lock(&vi->config_lock);
1239 if (!vi->config_enable)
1242 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
1243 offsetof(struct virtio_net_config, status),
1247 if (v & VIRTIO_NET_S_ANNOUNCE) {
1248 netdev_notify_peers(vi->dev);
1249 virtnet_ack_link_announce(vi);
1252 /* Ignore unknown (future) status bits */
1253 v &= VIRTIO_NET_S_LINK_UP;
1255 if (vi->status == v)
1260 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1261 netif_carrier_on(vi->dev);
1262 netif_tx_wake_all_queues(vi->dev);
1264 netif_carrier_off(vi->dev);
1265 netif_tx_stop_all_queues(vi->dev);
1268 mutex_unlock(&vi->config_lock);
1271 static void virtnet_config_changed(struct virtio_device *vdev)
1273 struct virtnet_info *vi = vdev->priv;
1275 schedule_work(&vi->config_work);
1278 static void virtnet_free_queues(struct virtnet_info *vi)
1284 static void free_receive_bufs(struct virtnet_info *vi)
1288 for (i = 0; i < vi->max_queue_pairs; i++) {
1289 while (vi->rq[i].pages)
1290 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1294 static void free_unused_bufs(struct virtnet_info *vi)
1299 for (i = 0; i < vi->max_queue_pairs; i++) {
1300 struct virtqueue *vq = vi->sq[i].vq;
1301 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1305 for (i = 0; i < vi->max_queue_pairs; i++) {
1306 struct virtqueue *vq = vi->rq[i].vq;
1308 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1309 if (vi->mergeable_rx_bufs || vi->big_packets)
1310 give_pages(&vi->rq[i], buf);
1315 BUG_ON(vi->rq[i].num != 0);
1319 static void virtnet_del_vqs(struct virtnet_info *vi)
1321 struct virtio_device *vdev = vi->vdev;
1323 virtnet_clean_affinity(vi, -1);
1325 vdev->config->del_vqs(vdev);
1327 virtnet_free_queues(vi);
1330 static int virtnet_find_vqs(struct virtnet_info *vi)
1332 vq_callback_t **callbacks;
1333 struct virtqueue **vqs;
1338 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1339 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1340 * possible control vq.
1342 total_vqs = vi->max_queue_pairs * 2 +
1343 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1345 /* Allocate space for find_vqs parameters */
1346 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1349 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1352 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1356 /* Parameters for control virtqueue, if any */
1358 callbacks[total_vqs - 1] = NULL;
1359 names[total_vqs - 1] = "control";
1362 /* Allocate/initialize parameters for send/receive virtqueues */
1363 for (i = 0; i < vi->max_queue_pairs; i++) {
1364 callbacks[rxq2vq(i)] = skb_recv_done;
1365 callbacks[txq2vq(i)] = skb_xmit_done;
1366 sprintf(vi->rq[i].name, "input.%d", i);
1367 sprintf(vi->sq[i].name, "output.%d", i);
1368 names[rxq2vq(i)] = vi->rq[i].name;
1369 names[txq2vq(i)] = vi->sq[i].name;
1372 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1378 vi->cvq = vqs[total_vqs - 1];
1379 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1380 vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1383 for (i = 0; i < vi->max_queue_pairs; i++) {
1384 vi->rq[i].vq = vqs[rxq2vq(i)];
1385 vi->sq[i].vq = vqs[txq2vq(i)];
1404 static int virtnet_alloc_queues(struct virtnet_info *vi)
1408 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1411 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1415 INIT_DELAYED_WORK(&vi->refill, refill_work);
1416 for (i = 0; i < vi->max_queue_pairs; i++) {
1417 vi->rq[i].pages = NULL;
1418 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1421 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1422 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1433 static int init_vqs(struct virtnet_info *vi)
1437 /* Allocate send & receive queues */
1438 ret = virtnet_alloc_queues(vi);
1442 ret = virtnet_find_vqs(vi);
1447 virtnet_set_affinity(vi);
1453 virtnet_free_queues(vi);
1458 static int virtnet_probe(struct virtio_device *vdev)
1461 struct net_device *dev;
1462 struct virtnet_info *vi;
1463 u16 max_queue_pairs;
1465 /* Find if host supports multiqueue virtio_net device */
1466 err = virtio_config_val(vdev, VIRTIO_NET_F_MQ,
1467 offsetof(struct virtio_net_config,
1468 max_virtqueue_pairs), &max_queue_pairs);
1470 /* We need at least 2 queue's */
1471 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1472 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1473 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1474 max_queue_pairs = 1;
1476 /* Allocate ourselves a network device with room for our info */
1477 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1481 /* Set up network device as normal. */
1482 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1483 dev->netdev_ops = &virtnet_netdev;
1484 dev->features = NETIF_F_HIGHDMA;
1486 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1487 SET_NETDEV_DEV(dev, &vdev->dev);
1489 /* Do we support "hardware" checksums? */
1490 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1491 /* This opens up the world of extra features. */
1492 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1494 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1496 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1497 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1498 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1500 /* Individual feature bits: what can host handle? */
1501 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1502 dev->hw_features |= NETIF_F_TSO;
1503 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1504 dev->hw_features |= NETIF_F_TSO6;
1505 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1506 dev->hw_features |= NETIF_F_TSO_ECN;
1507 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1508 dev->hw_features |= NETIF_F_UFO;
1511 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1512 /* (!csum && gso) case will be fixed by register_netdev() */
1515 /* Configuration may specify what MAC to use. Otherwise random. */
1516 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1517 offsetof(struct virtio_net_config, mac),
1518 dev->dev_addr, dev->addr_len) < 0)
1519 eth_hw_addr_random(dev);
1521 /* Set up our device-specific information */
1522 vi = netdev_priv(dev);
1526 vi->stats = alloc_percpu(struct virtnet_stats);
1528 if (vi->stats == NULL)
1531 vi->vq_index = alloc_percpu(int);
1532 if (vi->vq_index == NULL)
1535 mutex_init(&vi->config_lock);
1536 vi->config_enable = true;
1537 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1539 /* If we can receive ANY GSO packets, we must allocate large ones. */
1540 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1541 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1542 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1543 vi->big_packets = true;
1545 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1546 vi->mergeable_rx_bufs = true;
1548 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1551 /* Use single tx/rx queue pair as default */
1552 vi->curr_queue_pairs = 1;
1553 vi->max_queue_pairs = max_queue_pairs;
1555 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1560 netif_set_real_num_tx_queues(dev, 1);
1561 netif_set_real_num_rx_queues(dev, 1);
1563 err = register_netdev(dev);
1565 pr_debug("virtio_net: registering device failed\n");
1569 /* Last of all, set up some receive buffers. */
1570 for (i = 0; i < vi->max_queue_pairs; i++) {
1571 try_fill_recv(&vi->rq[i], GFP_KERNEL);
1573 /* If we didn't even get one input buffer, we're useless. */
1574 if (vi->rq[i].num == 0) {
1575 free_unused_bufs(vi);
1577 goto free_recv_bufs;
1581 vi->nb.notifier_call = &virtnet_cpu_callback;
1582 err = register_hotcpu_notifier(&vi->nb);
1584 pr_debug("virtio_net: registering cpu notifier failed\n");
1585 goto free_recv_bufs;
1588 /* Assume link up if device can't report link status,
1589 otherwise get link status from config. */
1590 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1591 netif_carrier_off(dev);
1592 schedule_work(&vi->config_work);
1594 vi->status = VIRTIO_NET_S_LINK_UP;
1595 netif_carrier_on(dev);
1598 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1599 dev->name, max_queue_pairs);
1604 free_receive_bufs(vi);
1605 unregister_netdev(dev);
1607 cancel_delayed_work_sync(&vi->refill);
1608 virtnet_del_vqs(vi);
1610 free_percpu(vi->vq_index);
1612 free_percpu(vi->stats);
1618 static void remove_vq_common(struct virtnet_info *vi)
1620 vi->vdev->config->reset(vi->vdev);
1622 /* Free unused buffers in both send and recv, if any. */
1623 free_unused_bufs(vi);
1625 free_receive_bufs(vi);
1627 virtnet_del_vqs(vi);
1630 static void virtnet_remove(struct virtio_device *vdev)
1632 struct virtnet_info *vi = vdev->priv;
1634 unregister_hotcpu_notifier(&vi->nb);
1636 /* Prevent config work handler from accessing the device. */
1637 mutex_lock(&vi->config_lock);
1638 vi->config_enable = false;
1639 mutex_unlock(&vi->config_lock);
1641 unregister_netdev(vi->dev);
1643 remove_vq_common(vi);
1645 flush_work(&vi->config_work);
1647 free_percpu(vi->vq_index);
1648 free_percpu(vi->stats);
1649 free_netdev(vi->dev);
1653 static int virtnet_freeze(struct virtio_device *vdev)
1655 struct virtnet_info *vi = vdev->priv;
1658 /* Prevent config work handler from accessing the device */
1659 mutex_lock(&vi->config_lock);
1660 vi->config_enable = false;
1661 mutex_unlock(&vi->config_lock);
1663 netif_device_detach(vi->dev);
1664 cancel_delayed_work_sync(&vi->refill);
1666 if (netif_running(vi->dev))
1667 for (i = 0; i < vi->max_queue_pairs; i++) {
1668 napi_disable(&vi->rq[i].napi);
1669 netif_napi_del(&vi->rq[i].napi);
1672 remove_vq_common(vi);
1674 flush_work(&vi->config_work);
1679 static int virtnet_restore(struct virtio_device *vdev)
1681 struct virtnet_info *vi = vdev->priv;
1688 if (netif_running(vi->dev))
1689 for (i = 0; i < vi->max_queue_pairs; i++)
1690 virtnet_napi_enable(&vi->rq[i]);
1692 netif_device_attach(vi->dev);
1694 for (i = 0; i < vi->max_queue_pairs; i++)
1695 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
1696 schedule_delayed_work(&vi->refill, 0);
1698 mutex_lock(&vi->config_lock);
1699 vi->config_enable = true;
1700 mutex_unlock(&vi->config_lock);
1702 virtnet_set_queues(vi, vi->curr_queue_pairs);
1708 static struct virtio_device_id id_table[] = {
1709 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1713 static unsigned int features[] = {
1714 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1715 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1716 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1717 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1718 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1719 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1720 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1721 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
1722 VIRTIO_NET_F_CTRL_MAC_ADDR,
1725 static struct virtio_driver virtio_net_driver = {
1726 .feature_table = features,
1727 .feature_table_size = ARRAY_SIZE(features),
1728 .driver.name = KBUILD_MODNAME,
1729 .driver.owner = THIS_MODULE,
1730 .id_table = id_table,
1731 .probe = virtnet_probe,
1732 .remove = virtnet_remove,
1733 .config_changed = virtnet_config_changed,
1735 .freeze = virtnet_freeze,
1736 .restore = virtnet_restore,
1740 module_virtio_driver(virtio_net_driver);
1742 MODULE_DEVICE_TABLE(virtio, id_table);
1743 MODULE_DESCRIPTION("Virtio network driver");
1744 MODULE_LICENSE("GPL");