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;
128 struct skb_vnet_hdr {
130 struct virtio_net_hdr hdr;
131 struct virtio_net_hdr_mrg_rxbuf mhdr;
136 struct padded_vnet_hdr {
137 struct virtio_net_hdr hdr;
139 * virtio_net_hdr should be in a separated sg buffer because of a
140 * QEMU bug, and data sg buffer shares same page with this header sg.
141 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
146 /* Converting between virtqueue no. and kernel tx/rx queue no.
147 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
149 static int vq2txq(struct virtqueue *vq)
151 return (virtqueue_get_queue_index(vq) - 1) / 2;
154 static int txq2vq(int txq)
159 static int vq2rxq(struct virtqueue *vq)
161 return virtqueue_get_queue_index(vq) / 2;
164 static int rxq2vq(int rxq)
169 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
171 return (struct skb_vnet_hdr *)skb->cb;
175 * private is used to chain pages for big packets, put the whole
176 * most recent used list in the beginning for reuse
178 static void give_pages(struct receive_queue *rq, struct page *page)
182 /* Find end of list, sew whole thing into vi->rq.pages. */
183 for (end = page; end->private; end = (struct page *)end->private);
184 end->private = (unsigned long)rq->pages;
188 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
190 struct page *p = rq->pages;
193 rq->pages = (struct page *)p->private;
194 /* clear private here, it is used to chain pages */
197 p = alloc_page(gfp_mask);
201 static void skb_xmit_done(struct virtqueue *vq)
203 struct virtnet_info *vi = vq->vdev->priv;
205 /* Suppress further interrupts. */
206 virtqueue_disable_cb(vq);
208 /* We were probably waiting for more output buffers. */
209 netif_wake_subqueue(vi->dev, vq2txq(vq));
212 static void set_skb_frag(struct sk_buff *skb, struct page *page,
213 unsigned int offset, unsigned int *len)
215 int size = min((unsigned)PAGE_SIZE - offset, *len);
216 int i = skb_shinfo(skb)->nr_frags;
218 __skb_fill_page_desc(skb, i, page, offset, size);
220 skb->data_len += size;
222 skb->truesize += PAGE_SIZE;
223 skb_shinfo(skb)->nr_frags++;
227 /* Called from bottom half context */
228 static struct sk_buff *page_to_skb(struct receive_queue *rq,
229 struct page *page, unsigned int len)
231 struct virtnet_info *vi = rq->vq->vdev->priv;
233 struct skb_vnet_hdr *hdr;
234 unsigned int copy, hdr_len, offset;
237 p = page_address(page);
239 /* copy small packet so we can reuse these pages for small data */
240 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
244 hdr = skb_vnet_hdr(skb);
246 if (vi->mergeable_rx_bufs) {
247 hdr_len = sizeof hdr->mhdr;
250 hdr_len = sizeof hdr->hdr;
251 offset = sizeof(struct padded_vnet_hdr);
254 memcpy(hdr, p, hdr_len);
260 if (copy > skb_tailroom(skb))
261 copy = skb_tailroom(skb);
262 memcpy(skb_put(skb, copy), p, copy);
268 * Verify that we can indeed put this data into a skb.
269 * This is here to handle cases when the device erroneously
270 * tries to receive more than is possible. This is usually
271 * the case of a broken device.
273 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
274 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
280 set_skb_frag(skb, page, offset, &len);
281 page = (struct page *)page->private;
286 give_pages(rq, page);
291 static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb)
293 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
297 num_buf = hdr->mhdr.num_buffers;
299 i = skb_shinfo(skb)->nr_frags;
300 if (i >= MAX_SKB_FRAGS) {
301 pr_debug("%s: packet too long\n", skb->dev->name);
302 skb->dev->stats.rx_length_errors++;
305 page = virtqueue_get_buf(rq->vq, &len);
307 pr_debug("%s: rx error: %d buffers missing\n",
308 skb->dev->name, hdr->mhdr.num_buffers);
309 skb->dev->stats.rx_length_errors++;
316 set_skb_frag(skb, page, 0, &len);
323 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
325 struct virtnet_info *vi = rq->vq->vdev->priv;
326 struct net_device *dev = vi->dev;
327 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
330 struct skb_vnet_hdr *hdr;
332 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
333 pr_debug("%s: short packet %i\n", dev->name, len);
334 dev->stats.rx_length_errors++;
335 if (vi->mergeable_rx_bufs || vi->big_packets)
342 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
344 len -= sizeof(struct virtio_net_hdr);
348 skb = page_to_skb(rq, page, len);
349 if (unlikely(!skb)) {
350 dev->stats.rx_dropped++;
351 give_pages(rq, page);
354 if (vi->mergeable_rx_bufs)
355 if (receive_mergeable(rq, skb)) {
361 hdr = skb_vnet_hdr(skb);
363 u64_stats_update_begin(&stats->rx_syncp);
364 stats->rx_bytes += skb->len;
366 u64_stats_update_end(&stats->rx_syncp);
368 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
369 pr_debug("Needs csum!\n");
370 if (!skb_partial_csum_set(skb,
372 hdr->hdr.csum_offset))
374 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
375 skb->ip_summed = CHECKSUM_UNNECESSARY;
378 skb->protocol = eth_type_trans(skb, dev);
379 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
380 ntohs(skb->protocol), skb->len, skb->pkt_type);
382 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
384 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
385 case VIRTIO_NET_HDR_GSO_TCPV4:
386 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
388 case VIRTIO_NET_HDR_GSO_UDP:
389 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
391 case VIRTIO_NET_HDR_GSO_TCPV6:
392 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
395 net_warn_ratelimited("%s: bad gso type %u.\n",
396 dev->name, hdr->hdr.gso_type);
400 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
401 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
403 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
404 if (skb_shinfo(skb)->gso_size == 0) {
405 net_warn_ratelimited("%s: zero gso size.\n", dev->name);
409 /* Header must be checked, and gso_segs computed. */
410 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
411 skb_shinfo(skb)->gso_segs = 0;
414 netif_receive_skb(skb);
418 dev->stats.rx_frame_errors++;
422 static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
424 struct virtnet_info *vi = rq->vq->vdev->priv;
426 struct skb_vnet_hdr *hdr;
429 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
433 skb_put(skb, MAX_PACKET_LEN);
435 hdr = skb_vnet_hdr(skb);
436 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
438 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
440 err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp);
447 static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
449 struct page *first, *list = NULL;
453 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
454 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
455 first = get_a_page(rq, gfp);
458 give_pages(rq, list);
461 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
463 /* chain new page in list head to match sg */
464 first->private = (unsigned long)list;
468 first = get_a_page(rq, gfp);
470 give_pages(rq, list);
473 p = page_address(first);
475 /* rq->sg[0], rq->sg[1] share the same page */
476 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
477 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
479 /* rq->sg[1] for data packet, from offset */
480 offset = sizeof(struct padded_vnet_hdr);
481 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
483 /* chain first in list head */
484 first->private = (unsigned long)list;
485 err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2,
488 give_pages(rq, first);
493 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
498 page = get_a_page(rq, gfp);
502 sg_init_one(rq->sg, page_address(page), PAGE_SIZE);
504 err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp);
506 give_pages(rq, page);
512 * Returns false if we couldn't fill entirely (OOM).
514 * Normally run in the receive path, but can also be run from ndo_open
515 * before we're receiving packets, or from refill_work which is
516 * careful to disable receiving (using napi_disable).
518 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
520 struct virtnet_info *vi = rq->vq->vdev->priv;
525 if (vi->mergeable_rx_bufs)
526 err = add_recvbuf_mergeable(rq, gfp);
527 else if (vi->big_packets)
528 err = add_recvbuf_big(rq, gfp);
530 err = add_recvbuf_small(rq, gfp);
532 oom = err == -ENOMEM;
537 if (unlikely(rq->num > rq->max))
539 virtqueue_kick(rq->vq);
543 static void skb_recv_done(struct virtqueue *rvq)
545 struct virtnet_info *vi = rvq->vdev->priv;
546 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
548 /* Schedule NAPI, Suppress further interrupts if successful. */
549 if (napi_schedule_prep(&rq->napi)) {
550 virtqueue_disable_cb(rvq);
551 __napi_schedule(&rq->napi);
555 static void virtnet_napi_enable(struct receive_queue *rq)
557 napi_enable(&rq->napi);
559 /* If all buffers were filled by other side before we napi_enabled, we
560 * won't get another interrupt, so process any outstanding packets
561 * now. virtnet_poll wants re-enable the queue, so we disable here.
562 * We synchronize against interrupts via NAPI_STATE_SCHED */
563 if (napi_schedule_prep(&rq->napi)) {
564 virtqueue_disable_cb(rq->vq);
566 __napi_schedule(&rq->napi);
571 static void refill_work(struct work_struct *work)
573 struct virtnet_info *vi =
574 container_of(work, struct virtnet_info, refill.work);
578 for (i = 0; i < vi->max_queue_pairs; i++) {
579 struct receive_queue *rq = &vi->rq[i];
581 napi_disable(&rq->napi);
582 still_empty = !try_fill_recv(rq, GFP_KERNEL);
583 virtnet_napi_enable(rq);
585 /* In theory, this can happen: if we don't get any buffers in
586 * we will *never* try to fill again.
589 schedule_delayed_work(&vi->refill, HZ/2);
593 static int virtnet_poll(struct napi_struct *napi, int budget)
595 struct receive_queue *rq =
596 container_of(napi, struct receive_queue, napi);
597 struct virtnet_info *vi = rq->vq->vdev->priv;
599 unsigned int len, received = 0;
602 while (received < budget &&
603 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
604 receive_buf(rq, buf, len);
609 if (rq->num < rq->max / 2) {
610 if (!try_fill_recv(rq, GFP_ATOMIC))
611 schedule_delayed_work(&vi->refill, 0);
614 /* Out of packets? */
615 if (received < budget) {
617 if (unlikely(!virtqueue_enable_cb(rq->vq)) &&
618 napi_schedule_prep(napi)) {
619 virtqueue_disable_cb(rq->vq);
620 __napi_schedule(napi);
628 static int virtnet_open(struct net_device *dev)
630 struct virtnet_info *vi = netdev_priv(dev);
633 for (i = 0; i < vi->max_queue_pairs; i++) {
634 /* Make sure we have some buffers: if oom use wq. */
635 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
636 schedule_delayed_work(&vi->refill, 0);
637 virtnet_napi_enable(&vi->rq[i]);
643 static unsigned int free_old_xmit_skbs(struct send_queue *sq)
646 unsigned int len, tot_sgs = 0;
647 struct virtnet_info *vi = sq->vq->vdev->priv;
648 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
650 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
651 pr_debug("Sent skb %p\n", skb);
653 u64_stats_update_begin(&stats->tx_syncp);
654 stats->tx_bytes += skb->len;
656 u64_stats_update_end(&stats->tx_syncp);
658 tot_sgs += skb_vnet_hdr(skb)->num_sg;
659 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;
670 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
672 if (skb->ip_summed == CHECKSUM_PARTIAL) {
673 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
674 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
675 hdr->hdr.csum_offset = skb->csum_offset;
678 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
681 if (skb_is_gso(skb)) {
682 hdr->hdr.hdr_len = skb_headlen(skb);
683 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
684 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
685 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
686 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
687 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
688 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
689 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
692 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
693 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
695 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
696 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
699 hdr->mhdr.num_buffers = 0;
701 /* Encode metadata header at front. */
702 if (vi->mergeable_rx_bufs)
703 sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr);
705 sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr);
707 hdr->num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
708 return virtqueue_add_buf(sq->vq, sq->sg, hdr->num_sg,
712 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
714 struct virtnet_info *vi = netdev_priv(dev);
715 int qnum = skb_get_queue_mapping(skb);
716 struct send_queue *sq = &vi->sq[qnum];
719 /* Free up any pending old buffers before queueing new ones. */
720 free_old_xmit_skbs(sq);
722 /* Try to transmit */
723 capacity = xmit_skb(sq, skb);
725 /* This can happen with OOM and indirect buffers. */
726 if (unlikely(capacity < 0)) {
727 if (likely(capacity == -ENOMEM)) {
730 "TXQ (%d) failure: out of memory\n",
733 dev->stats.tx_fifo_errors++;
736 "Unexpected TXQ (%d) failure: %d\n",
739 dev->stats.tx_dropped++;
743 virtqueue_kick(sq->vq);
745 /* Don't wait up for transmitted skbs to be freed. */
749 /* Apparently nice girls don't return TX_BUSY; stop the queue
750 * before it gets out of hand. Naturally, this wastes entries. */
751 if (capacity < 2+MAX_SKB_FRAGS) {
752 netif_stop_subqueue(dev, qnum);
753 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
754 /* More just got used, free them then recheck. */
755 capacity += free_old_xmit_skbs(sq);
756 if (capacity >= 2+MAX_SKB_FRAGS) {
757 netif_start_subqueue(dev, qnum);
758 virtqueue_disable_cb(sq->vq);
766 static int virtnet_set_mac_address(struct net_device *dev, void *p)
768 struct virtnet_info *vi = netdev_priv(dev);
769 struct virtio_device *vdev = vi->vdev;
772 ret = eth_mac_addr(dev, p);
776 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
777 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
778 dev->dev_addr, dev->addr_len);
783 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
784 struct rtnl_link_stats64 *tot)
786 struct virtnet_info *vi = netdev_priv(dev);
790 for_each_possible_cpu(cpu) {
791 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
792 u64 tpackets, tbytes, rpackets, rbytes;
795 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
796 tpackets = stats->tx_packets;
797 tbytes = stats->tx_bytes;
798 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
801 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
802 rpackets = stats->rx_packets;
803 rbytes = stats->rx_bytes;
804 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
806 tot->rx_packets += rpackets;
807 tot->tx_packets += tpackets;
808 tot->rx_bytes += rbytes;
809 tot->tx_bytes += tbytes;
812 tot->tx_dropped = dev->stats.tx_dropped;
813 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
814 tot->rx_dropped = dev->stats.rx_dropped;
815 tot->rx_length_errors = dev->stats.rx_length_errors;
816 tot->rx_frame_errors = dev->stats.rx_frame_errors;
821 #ifdef CONFIG_NET_POLL_CONTROLLER
822 static void virtnet_netpoll(struct net_device *dev)
824 struct virtnet_info *vi = netdev_priv(dev);
827 for (i = 0; i < vi->curr_queue_pairs; i++)
828 napi_schedule(&vi->rq[i].napi);
833 * Send command via the control virtqueue and check status. Commands
834 * supported by the hypervisor, as indicated by feature bits, should
835 * never fail unless improperly formated.
837 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
838 struct scatterlist *data, int out, int in)
840 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
841 struct virtio_net_ctrl_hdr ctrl;
842 virtio_net_ctrl_ack status = ~0;
846 /* Caller should know better */
847 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
848 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
850 out++; /* Add header */
851 in++; /* Add return status */
856 sg_init_table(sg, out + in);
858 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
859 for_each_sg(data, s, out + in - 2, i)
860 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
861 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
863 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
865 virtqueue_kick(vi->cvq);
868 * Spin for a response, the kick causes an ioport write, trapping
869 * into the hypervisor, so the request should be handled immediately.
871 while (!virtqueue_get_buf(vi->cvq, &tmp))
874 return status == VIRTIO_NET_OK;
877 static void virtnet_ack_link_announce(struct virtnet_info *vi)
880 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
881 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL,
883 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
887 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
889 struct scatterlist sg;
890 struct virtio_net_ctrl_mq s;
891 struct net_device *dev = vi->dev;
893 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
896 s.virtqueue_pairs = queue_pairs;
897 sg_init_one(&sg, &s, sizeof(s));
899 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
900 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){
901 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
905 vi->curr_queue_pairs = queue_pairs;
910 static int virtnet_close(struct net_device *dev)
912 struct virtnet_info *vi = netdev_priv(dev);
915 /* Make sure refill_work doesn't re-enable napi! */
916 cancel_delayed_work_sync(&vi->refill);
918 for (i = 0; i < vi->max_queue_pairs; i++)
919 napi_disable(&vi->rq[i].napi);
924 static void virtnet_set_rx_mode(struct net_device *dev)
926 struct virtnet_info *vi = netdev_priv(dev);
927 struct scatterlist sg[2];
928 u8 promisc, allmulti;
929 struct virtio_net_ctrl_mac *mac_data;
930 struct netdev_hw_addr *ha;
936 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
937 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
940 promisc = ((dev->flags & IFF_PROMISC) != 0);
941 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
943 sg_init_one(sg, &promisc, sizeof(promisc));
945 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
946 VIRTIO_NET_CTRL_RX_PROMISC,
948 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
949 promisc ? "en" : "dis");
951 sg_init_one(sg, &allmulti, sizeof(allmulti));
953 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
954 VIRTIO_NET_CTRL_RX_ALLMULTI,
956 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
957 allmulti ? "en" : "dis");
959 uc_count = netdev_uc_count(dev);
960 mc_count = netdev_mc_count(dev);
961 /* MAC filter - use one buffer for both lists */
962 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
963 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
966 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
970 sg_init_table(sg, 2);
972 /* Store the unicast list and count in the front of the buffer */
973 mac_data->entries = uc_count;
975 netdev_for_each_uc_addr(ha, dev)
976 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
978 sg_set_buf(&sg[0], mac_data,
979 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
981 /* multicast list and count fill the end */
982 mac_data = (void *)&mac_data->macs[uc_count][0];
984 mac_data->entries = mc_count;
986 netdev_for_each_mc_addr(ha, dev)
987 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
989 sg_set_buf(&sg[1], mac_data,
990 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
992 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
993 VIRTIO_NET_CTRL_MAC_TABLE_SET,
995 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
1000 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
1002 struct virtnet_info *vi = netdev_priv(dev);
1003 struct scatterlist sg;
1005 sg_init_one(&sg, &vid, sizeof(vid));
1007 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1008 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
1009 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1013 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
1015 struct virtnet_info *vi = netdev_priv(dev);
1016 struct scatterlist sg;
1018 sg_init_one(&sg, &vid, sizeof(vid));
1020 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1021 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
1022 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1026 static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
1030 /* In multiqueue mode, when the number of cpu is equal to the number of
1031 * queue pairs, we let the queue pairs to be private to one cpu by
1032 * setting the affinity hint to eliminate the contention.
1034 if ((vi->curr_queue_pairs == 1 ||
1035 vi->max_queue_pairs != num_online_cpus()) && set) {
1036 if (vi->affinity_hint_set)
1042 for (i = 0; i < vi->max_queue_pairs; i++) {
1043 int cpu = set ? i : -1;
1044 virtqueue_set_affinity(vi->rq[i].vq, cpu);
1045 virtqueue_set_affinity(vi->sq[i].vq, cpu);
1049 vi->affinity_hint_set = true;
1051 vi->affinity_hint_set = false;
1054 static void virtnet_get_ringparam(struct net_device *dev,
1055 struct ethtool_ringparam *ring)
1057 struct virtnet_info *vi = netdev_priv(dev);
1059 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
1060 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
1061 ring->rx_pending = ring->rx_max_pending;
1062 ring->tx_pending = ring->tx_max_pending;
1066 static void virtnet_get_drvinfo(struct net_device *dev,
1067 struct ethtool_drvinfo *info)
1069 struct virtnet_info *vi = netdev_priv(dev);
1070 struct virtio_device *vdev = vi->vdev;
1072 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
1073 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
1074 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
1078 /* TODO: Eliminate OOO packets during switching */
1079 static int virtnet_set_channels(struct net_device *dev,
1080 struct ethtool_channels *channels)
1082 struct virtnet_info *vi = netdev_priv(dev);
1083 u16 queue_pairs = channels->combined_count;
1086 /* We don't support separate rx/tx channels.
1087 * We don't allow setting 'other' channels.
1089 if (channels->rx_count || channels->tx_count || channels->other_count)
1092 if (queue_pairs > vi->max_queue_pairs)
1095 err = virtnet_set_queues(vi, queue_pairs);
1097 netif_set_real_num_tx_queues(dev, queue_pairs);
1098 netif_set_real_num_rx_queues(dev, queue_pairs);
1100 virtnet_set_affinity(vi, true);
1106 static void virtnet_get_channels(struct net_device *dev,
1107 struct ethtool_channels *channels)
1109 struct virtnet_info *vi = netdev_priv(dev);
1111 channels->combined_count = vi->curr_queue_pairs;
1112 channels->max_combined = vi->max_queue_pairs;
1113 channels->max_other = 0;
1114 channels->rx_count = 0;
1115 channels->tx_count = 0;
1116 channels->other_count = 0;
1119 static const struct ethtool_ops virtnet_ethtool_ops = {
1120 .get_drvinfo = virtnet_get_drvinfo,
1121 .get_link = ethtool_op_get_link,
1122 .get_ringparam = virtnet_get_ringparam,
1123 .set_channels = virtnet_set_channels,
1124 .get_channels = virtnet_get_channels,
1128 #define MAX_MTU 65535
1130 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
1132 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
1138 /* To avoid contending a lock hold by a vcpu who would exit to host, select the
1139 * txq based on the processor id.
1140 * TODO: handle cpu hotplug.
1142 static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
1144 int txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) :
1147 while (unlikely(txq >= dev->real_num_tx_queues))
1148 txq -= dev->real_num_tx_queues;
1153 static const struct net_device_ops virtnet_netdev = {
1154 .ndo_open = virtnet_open,
1155 .ndo_stop = virtnet_close,
1156 .ndo_start_xmit = start_xmit,
1157 .ndo_validate_addr = eth_validate_addr,
1158 .ndo_set_mac_address = virtnet_set_mac_address,
1159 .ndo_set_rx_mode = virtnet_set_rx_mode,
1160 .ndo_change_mtu = virtnet_change_mtu,
1161 .ndo_get_stats64 = virtnet_stats,
1162 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
1163 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
1164 .ndo_select_queue = virtnet_select_queue,
1165 #ifdef CONFIG_NET_POLL_CONTROLLER
1166 .ndo_poll_controller = virtnet_netpoll,
1170 static void virtnet_config_changed_work(struct work_struct *work)
1172 struct virtnet_info *vi =
1173 container_of(work, struct virtnet_info, config_work);
1176 mutex_lock(&vi->config_lock);
1177 if (!vi->config_enable)
1180 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
1181 offsetof(struct virtio_net_config, status),
1185 if (v & VIRTIO_NET_S_ANNOUNCE) {
1186 netdev_notify_peers(vi->dev);
1187 virtnet_ack_link_announce(vi);
1190 /* Ignore unknown (future) status bits */
1191 v &= VIRTIO_NET_S_LINK_UP;
1193 if (vi->status == v)
1198 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1199 netif_carrier_on(vi->dev);
1200 netif_tx_wake_all_queues(vi->dev);
1202 netif_carrier_off(vi->dev);
1203 netif_tx_stop_all_queues(vi->dev);
1206 mutex_unlock(&vi->config_lock);
1209 static void virtnet_config_changed(struct virtio_device *vdev)
1211 struct virtnet_info *vi = vdev->priv;
1213 schedule_work(&vi->config_work);
1216 static void virtnet_free_queues(struct virtnet_info *vi)
1222 static void free_receive_bufs(struct virtnet_info *vi)
1226 for (i = 0; i < vi->max_queue_pairs; i++) {
1227 while (vi->rq[i].pages)
1228 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
1232 static void free_unused_bufs(struct virtnet_info *vi)
1237 for (i = 0; i < vi->max_queue_pairs; i++) {
1238 struct virtqueue *vq = vi->sq[i].vq;
1239 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
1243 for (i = 0; i < vi->max_queue_pairs; i++) {
1244 struct virtqueue *vq = vi->rq[i].vq;
1246 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
1247 if (vi->mergeable_rx_bufs || vi->big_packets)
1248 give_pages(&vi->rq[i], buf);
1253 BUG_ON(vi->rq[i].num != 0);
1257 static void virtnet_del_vqs(struct virtnet_info *vi)
1259 struct virtio_device *vdev = vi->vdev;
1261 virtnet_set_affinity(vi, false);
1263 vdev->config->del_vqs(vdev);
1265 virtnet_free_queues(vi);
1268 static int virtnet_find_vqs(struct virtnet_info *vi)
1270 vq_callback_t **callbacks;
1271 struct virtqueue **vqs;
1276 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1277 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1278 * possible control vq.
1280 total_vqs = vi->max_queue_pairs * 2 +
1281 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
1283 /* Allocate space for find_vqs parameters */
1284 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
1287 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
1290 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
1294 /* Parameters for control virtqueue, if any */
1296 callbacks[total_vqs - 1] = NULL;
1297 names[total_vqs - 1] = "control";
1300 /* Allocate/initialize parameters for send/receive virtqueues */
1301 for (i = 0; i < vi->max_queue_pairs; i++) {
1302 callbacks[rxq2vq(i)] = skb_recv_done;
1303 callbacks[txq2vq(i)] = skb_xmit_done;
1304 sprintf(vi->rq[i].name, "input.%d", i);
1305 sprintf(vi->sq[i].name, "output.%d", i);
1306 names[rxq2vq(i)] = vi->rq[i].name;
1307 names[txq2vq(i)] = vi->sq[i].name;
1310 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
1316 vi->cvq = vqs[total_vqs - 1];
1317 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1318 vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1321 for (i = 0; i < vi->max_queue_pairs; i++) {
1322 vi->rq[i].vq = vqs[rxq2vq(i)];
1323 vi->sq[i].vq = vqs[txq2vq(i)];
1342 static int virtnet_alloc_queues(struct virtnet_info *vi)
1346 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
1349 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
1353 INIT_DELAYED_WORK(&vi->refill, refill_work);
1354 for (i = 0; i < vi->max_queue_pairs; i++) {
1355 vi->rq[i].pages = NULL;
1356 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
1359 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
1360 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
1371 static int init_vqs(struct virtnet_info *vi)
1375 /* Allocate send & receive queues */
1376 ret = virtnet_alloc_queues(vi);
1380 ret = virtnet_find_vqs(vi);
1384 virtnet_set_affinity(vi, true);
1388 virtnet_free_queues(vi);
1393 static int virtnet_probe(struct virtio_device *vdev)
1396 struct net_device *dev;
1397 struct virtnet_info *vi;
1398 u16 max_queue_pairs;
1400 /* Find if host supports multiqueue virtio_net device */
1401 err = virtio_config_val(vdev, VIRTIO_NET_F_MQ,
1402 offsetof(struct virtio_net_config,
1403 max_virtqueue_pairs), &max_queue_pairs);
1405 /* We need at least 2 queue's */
1406 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1407 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1408 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1409 max_queue_pairs = 1;
1411 /* Allocate ourselves a network device with room for our info */
1412 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
1416 /* Set up network device as normal. */
1417 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1418 dev->netdev_ops = &virtnet_netdev;
1419 dev->features = NETIF_F_HIGHDMA;
1421 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1422 SET_NETDEV_DEV(dev, &vdev->dev);
1424 /* Do we support "hardware" checksums? */
1425 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1426 /* This opens up the world of extra features. */
1427 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1429 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1431 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1432 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1433 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1435 /* Individual feature bits: what can host handle? */
1436 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1437 dev->hw_features |= NETIF_F_TSO;
1438 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1439 dev->hw_features |= NETIF_F_TSO6;
1440 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1441 dev->hw_features |= NETIF_F_TSO_ECN;
1442 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1443 dev->hw_features |= NETIF_F_UFO;
1446 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1447 /* (!csum && gso) case will be fixed by register_netdev() */
1450 /* Configuration may specify what MAC to use. Otherwise random. */
1451 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1452 offsetof(struct virtio_net_config, mac),
1453 dev->dev_addr, dev->addr_len) < 0)
1454 eth_hw_addr_random(dev);
1456 /* Set up our device-specific information */
1457 vi = netdev_priv(dev);
1461 vi->stats = alloc_percpu(struct virtnet_stats);
1463 if (vi->stats == NULL)
1466 mutex_init(&vi->config_lock);
1467 vi->config_enable = true;
1468 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1470 /* If we can receive ANY GSO packets, we must allocate large ones. */
1471 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1472 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1473 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1474 vi->big_packets = true;
1476 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1477 vi->mergeable_rx_bufs = true;
1479 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
1482 /* Use single tx/rx queue pair as default */
1483 vi->curr_queue_pairs = 1;
1484 vi->max_queue_pairs = max_queue_pairs;
1486 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1491 netif_set_real_num_tx_queues(dev, 1);
1492 netif_set_real_num_rx_queues(dev, 1);
1494 err = register_netdev(dev);
1496 pr_debug("virtio_net: registering device failed\n");
1500 /* Last of all, set up some receive buffers. */
1501 for (i = 0; i < vi->max_queue_pairs; i++) {
1502 try_fill_recv(&vi->rq[i], GFP_KERNEL);
1504 /* If we didn't even get one input buffer, we're useless. */
1505 if (vi->rq[i].num == 0) {
1506 free_unused_bufs(vi);
1508 goto free_recv_bufs;
1512 /* Assume link up if device can't report link status,
1513 otherwise get link status from config. */
1514 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1515 netif_carrier_off(dev);
1516 schedule_work(&vi->config_work);
1518 vi->status = VIRTIO_NET_S_LINK_UP;
1519 netif_carrier_on(dev);
1522 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1523 dev->name, max_queue_pairs);
1528 free_receive_bufs(vi);
1529 unregister_netdev(dev);
1531 cancel_delayed_work_sync(&vi->refill);
1532 virtnet_del_vqs(vi);
1534 free_percpu(vi->stats);
1540 static void remove_vq_common(struct virtnet_info *vi)
1542 vi->vdev->config->reset(vi->vdev);
1544 /* Free unused buffers in both send and recv, if any. */
1545 free_unused_bufs(vi);
1547 free_receive_bufs(vi);
1549 virtnet_del_vqs(vi);
1552 static void virtnet_remove(struct virtio_device *vdev)
1554 struct virtnet_info *vi = vdev->priv;
1556 /* Prevent config work handler from accessing the device. */
1557 mutex_lock(&vi->config_lock);
1558 vi->config_enable = false;
1559 mutex_unlock(&vi->config_lock);
1561 unregister_netdev(vi->dev);
1563 remove_vq_common(vi);
1565 flush_work(&vi->config_work);
1567 free_percpu(vi->stats);
1568 free_netdev(vi->dev);
1572 static int virtnet_freeze(struct virtio_device *vdev)
1574 struct virtnet_info *vi = vdev->priv;
1577 /* Prevent config work handler from accessing the device */
1578 mutex_lock(&vi->config_lock);
1579 vi->config_enable = false;
1580 mutex_unlock(&vi->config_lock);
1582 netif_device_detach(vi->dev);
1583 cancel_delayed_work_sync(&vi->refill);
1585 if (netif_running(vi->dev))
1586 for (i = 0; i < vi->max_queue_pairs; i++) {
1587 napi_disable(&vi->rq[i].napi);
1588 netif_napi_del(&vi->rq[i].napi);
1591 remove_vq_common(vi);
1593 flush_work(&vi->config_work);
1598 static int virtnet_restore(struct virtio_device *vdev)
1600 struct virtnet_info *vi = vdev->priv;
1607 if (netif_running(vi->dev))
1608 for (i = 0; i < vi->max_queue_pairs; i++)
1609 virtnet_napi_enable(&vi->rq[i]);
1611 netif_device_attach(vi->dev);
1613 for (i = 0; i < vi->max_queue_pairs; i++)
1614 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
1615 schedule_delayed_work(&vi->refill, 0);
1617 mutex_lock(&vi->config_lock);
1618 vi->config_enable = true;
1619 mutex_unlock(&vi->config_lock);
1621 virtnet_set_queues(vi, vi->curr_queue_pairs);
1627 static struct virtio_device_id id_table[] = {
1628 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1632 static unsigned int features[] = {
1633 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1634 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1635 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1636 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1637 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1638 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1639 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1640 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
1643 static struct virtio_driver virtio_net_driver = {
1644 .feature_table = features,
1645 .feature_table_size = ARRAY_SIZE(features),
1646 .driver.name = KBUILD_MODNAME,
1647 .driver.owner = THIS_MODULE,
1648 .id_table = id_table,
1649 .probe = virtnet_probe,
1650 .remove = virtnet_remove,
1651 .config_changed = virtnet_config_changed,
1653 .freeze = virtnet_freeze,
1654 .restore = virtnet_restore,
1658 static int __init init(void)
1660 return register_virtio_driver(&virtio_net_driver);
1663 static void __exit fini(void)
1665 unregister_virtio_driver(&virtio_net_driver);
1670 MODULE_DEVICE_TABLE(virtio, id_table);
1671 MODULE_DESCRIPTION("Virtio network driver");
1672 MODULE_LICENSE("GPL");