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>
29 static int napi_weight = 128;
30 module_param(napi_weight, int, 0444);
32 static int csum = 1, gso = 1;
33 module_param(csum, bool, 0444);
34 module_param(gso, bool, 0444);
36 /* FIXME: MTU in config. */
37 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
38 #define GOOD_COPY_LEN 128
40 #define VIRTNET_SEND_COMMAND_SG_MAX 2
44 struct virtio_device *vdev;
45 struct virtqueue *rvq, *svq, *cvq;
46 struct net_device *dev;
47 struct napi_struct napi;
50 /* Number of input buffers, and max we've ever had. */
51 unsigned int num, max;
53 /* I like... big packets and I cannot lie! */
56 /* Host will merge rx buffers for big packets (shake it! shake it!) */
57 bool mergeable_rx_bufs;
60 struct sk_buff_head send;
62 /* Work struct for refilling if we run low on memory. */
63 struct delayed_work refill;
65 /* Chain pages by the private ptr. */
71 struct virtio_net_hdr hdr;
72 struct virtio_net_hdr_mrg_rxbuf mhdr;
77 struct padded_vnet_hdr {
78 struct virtio_net_hdr hdr;
80 * virtio_net_hdr should be in a separated sg buffer because of a
81 * QEMU bug, and data sg buffer shares same page with this header sg.
82 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
87 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
89 return (struct skb_vnet_hdr *)skb->cb;
93 * private is used to chain pages for big packets, put the whole
94 * most recent used list in the beginning for reuse
96 static void give_pages(struct virtnet_info *vi, struct page *page)
100 /* Find end of list, sew whole thing into vi->pages. */
101 for (end = page; end->private; end = (struct page *)end->private);
102 end->private = (unsigned long)vi->pages;
106 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
108 struct page *p = vi->pages;
111 vi->pages = (struct page *)p->private;
112 /* clear private here, it is used to chain pages */
115 p = alloc_page(gfp_mask);
119 static void skb_xmit_done(struct virtqueue *svq)
121 struct virtnet_info *vi = svq->vdev->priv;
123 /* Suppress further interrupts. */
124 svq->vq_ops->disable_cb(svq);
126 /* We were probably waiting for more output buffers. */
127 netif_wake_queue(vi->dev);
130 static void set_skb_frag(struct sk_buff *skb, struct page *page,
131 unsigned int offset, unsigned int *len)
133 int i = skb_shinfo(skb)->nr_frags;
136 f = &skb_shinfo(skb)->frags[i];
137 f->size = min((unsigned)PAGE_SIZE - offset, *len);
138 f->page_offset = offset;
141 skb->data_len += f->size;
143 skb_shinfo(skb)->nr_frags++;
147 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
148 struct page *page, unsigned int len)
151 struct skb_vnet_hdr *hdr;
152 unsigned int copy, hdr_len, offset;
155 p = page_address(page);
157 /* copy small packet so we can reuse these pages for small data */
158 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
162 hdr = skb_vnet_hdr(skb);
164 if (vi->mergeable_rx_bufs) {
165 hdr_len = sizeof hdr->mhdr;
168 hdr_len = sizeof hdr->hdr;
169 offset = sizeof(struct padded_vnet_hdr);
172 memcpy(hdr, p, hdr_len);
178 if (copy > skb_tailroom(skb))
179 copy = skb_tailroom(skb);
180 memcpy(skb_put(skb, copy), p, copy);
186 set_skb_frag(skb, page, offset, &len);
187 page = (struct page *)page->private;
192 give_pages(vi, page);
197 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
199 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
203 num_buf = hdr->mhdr.num_buffers;
205 i = skb_shinfo(skb)->nr_frags;
206 if (i >= MAX_SKB_FRAGS) {
207 pr_debug("%s: packet too long\n", skb->dev->name);
208 skb->dev->stats.rx_length_errors++;
212 page = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
214 pr_debug("%s: rx error: %d buffers missing\n",
215 skb->dev->name, hdr->mhdr.num_buffers);
216 skb->dev->stats.rx_length_errors++;
222 set_skb_frag(skb, page, 0, &len);
229 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
231 struct virtnet_info *vi = netdev_priv(dev);
234 struct skb_vnet_hdr *hdr;
236 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
237 pr_debug("%s: short packet %i\n", dev->name, len);
238 dev->stats.rx_length_errors++;
239 if (vi->mergeable_rx_bufs || vi->big_packets)
246 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
248 len -= sizeof(struct virtio_net_hdr);
252 skb = page_to_skb(vi, page, len);
253 if (unlikely(!skb)) {
254 dev->stats.rx_dropped++;
255 give_pages(vi, page);
258 if (vi->mergeable_rx_bufs)
259 if (receive_mergeable(vi, skb)) {
265 hdr = skb_vnet_hdr(skb);
266 skb->truesize += skb->data_len;
267 dev->stats.rx_bytes += skb->len;
268 dev->stats.rx_packets++;
270 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
271 pr_debug("Needs csum!\n");
272 if (!skb_partial_csum_set(skb,
274 hdr->hdr.csum_offset))
278 skb->protocol = eth_type_trans(skb, dev);
279 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
280 ntohs(skb->protocol), skb->len, skb->pkt_type);
282 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
284 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
285 case VIRTIO_NET_HDR_GSO_TCPV4:
286 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
288 case VIRTIO_NET_HDR_GSO_UDP:
289 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
291 case VIRTIO_NET_HDR_GSO_TCPV6:
292 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
296 printk(KERN_WARNING "%s: bad gso type %u.\n",
297 dev->name, hdr->hdr.gso_type);
301 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
302 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
304 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
305 if (skb_shinfo(skb)->gso_size == 0) {
307 printk(KERN_WARNING "%s: zero gso size.\n",
312 /* Header must be checked, and gso_segs computed. */
313 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
314 skb_shinfo(skb)->gso_segs = 0;
317 netif_receive_skb(skb);
321 dev->stats.rx_frame_errors++;
325 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
328 struct skb_vnet_hdr *hdr;
329 struct scatterlist sg[2];
332 skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
336 skb_put(skb, MAX_PACKET_LEN);
338 hdr = skb_vnet_hdr(skb);
339 sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
341 skb_to_sgvec(skb, sg + 1, 0, skb->len);
343 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb);
350 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
352 struct scatterlist sg[MAX_SKB_FRAGS + 2];
353 struct page *first, *list = NULL;
357 /* page in sg[MAX_SKB_FRAGS + 1] is list tail */
358 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
359 first = get_a_page(vi, gfp);
362 give_pages(vi, list);
365 sg_set_buf(&sg[i], page_address(first), PAGE_SIZE);
367 /* chain new page in list head to match sg */
368 first->private = (unsigned long)list;
372 first = get_a_page(vi, gfp);
374 give_pages(vi, list);
377 p = page_address(first);
379 /* sg[0], sg[1] share the same page */
380 /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/
381 sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr));
383 /* sg[1] for data packet, from offset */
384 offset = sizeof(struct padded_vnet_hdr);
385 sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset);
387 /* chain first in list head */
388 first->private = (unsigned long)list;
389 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2,
392 give_pages(vi, first);
397 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
400 struct scatterlist sg;
403 page = get_a_page(vi, gfp);
407 sg_init_one(&sg, page_address(page), PAGE_SIZE);
409 err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page);
411 give_pages(vi, page);
416 /* Returns false if we couldn't fill entirely (OOM). */
417 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
423 if (vi->mergeable_rx_bufs)
424 err = add_recvbuf_mergeable(vi, gfp);
425 else if (vi->big_packets)
426 err = add_recvbuf_big(vi, gfp);
428 err = add_recvbuf_small(vi, gfp);
436 if (unlikely(vi->num > vi->max))
438 vi->rvq->vq_ops->kick(vi->rvq);
442 static void skb_recv_done(struct virtqueue *rvq)
444 struct virtnet_info *vi = rvq->vdev->priv;
445 /* Schedule NAPI, Suppress further interrupts if successful. */
446 if (napi_schedule_prep(&vi->napi)) {
447 rvq->vq_ops->disable_cb(rvq);
448 __napi_schedule(&vi->napi);
452 static void refill_work(struct work_struct *work)
454 struct virtnet_info *vi;
457 vi = container_of(work, struct virtnet_info, refill.work);
458 napi_disable(&vi->napi);
459 still_empty = !try_fill_recv(vi, GFP_KERNEL);
460 napi_enable(&vi->napi);
462 /* In theory, this can happen: if we don't get any buffers in
463 * we will *never* try to fill again. */
465 schedule_delayed_work(&vi->refill, HZ/2);
468 static int virtnet_poll(struct napi_struct *napi, int budget)
470 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
472 unsigned int len, received = 0;
475 while (received < budget &&
476 (buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
477 receive_buf(vi->dev, buf, len);
482 if (vi->num < vi->max / 2) {
483 if (!try_fill_recv(vi, GFP_ATOMIC))
484 schedule_delayed_work(&vi->refill, 0);
487 /* Out of packets? */
488 if (received < budget) {
490 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) &&
491 napi_schedule_prep(napi)) {
492 vi->rvq->vq_ops->disable_cb(vi->rvq);
493 __napi_schedule(napi);
501 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
504 unsigned int len, tot_sgs = 0;
506 while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
507 pr_debug("Sent skb %p\n", skb);
508 __skb_unlink(skb, &vi->send);
509 vi->dev->stats.tx_bytes += skb->len;
510 vi->dev->stats.tx_packets++;
511 tot_sgs += skb_vnet_hdr(skb)->num_sg;
512 dev_kfree_skb_any(skb);
517 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
519 struct scatterlist sg[2+MAX_SKB_FRAGS];
520 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
521 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
523 sg_init_table(sg, 2+MAX_SKB_FRAGS);
525 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
527 if (skb->ip_summed == CHECKSUM_PARTIAL) {
528 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
529 hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
530 hdr->hdr.csum_offset = skb->csum_offset;
533 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
536 if (skb_is_gso(skb)) {
537 hdr->hdr.hdr_len = skb_headlen(skb);
538 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
539 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
540 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
541 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
542 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
543 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
544 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
547 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
548 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
550 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
551 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
554 hdr->mhdr.num_buffers = 0;
556 /* Encode metadata header at front. */
557 if (vi->mergeable_rx_bufs)
558 sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr);
560 sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
562 hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
563 return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
566 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
568 struct virtnet_info *vi = netdev_priv(dev);
572 /* Free up any pending old buffers before queueing new ones. */
573 free_old_xmit_skbs(vi);
575 /* Try to transmit */
576 capacity = xmit_skb(vi, skb);
578 /* This can happen with OOM and indirect buffers. */
579 if (unlikely(capacity < 0)) {
580 netif_stop_queue(dev);
581 dev_warn(&dev->dev, "Unexpected full queue\n");
582 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
583 vi->svq->vq_ops->disable_cb(vi->svq);
584 netif_start_queue(dev);
587 return NETDEV_TX_BUSY;
589 vi->svq->vq_ops->kick(vi->svq);
592 * Put new one in send queue. You'd expect we'd need this before
593 * xmit_skb calls add_buf(), since the callback can be triggered
594 * immediately after that. But since the callback just triggers
595 * another call back here, normal network xmit locking prevents the
598 __skb_queue_head(&vi->send, skb);
600 /* Don't wait up for transmitted skbs to be freed. */
604 /* Apparently nice girls don't return TX_BUSY; stop the queue
605 * before it gets out of hand. Naturally, this wastes entries. */
606 if (capacity < 2+MAX_SKB_FRAGS) {
607 netif_stop_queue(dev);
608 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
609 /* More just got used, free them then recheck. */
610 capacity += free_old_xmit_skbs(vi);
611 if (capacity >= 2+MAX_SKB_FRAGS) {
612 netif_start_queue(dev);
613 vi->svq->vq_ops->disable_cb(vi->svq);
621 static int virtnet_set_mac_address(struct net_device *dev, void *p)
623 struct virtnet_info *vi = netdev_priv(dev);
624 struct virtio_device *vdev = vi->vdev;
627 ret = eth_mac_addr(dev, p);
631 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
632 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
633 dev->dev_addr, dev->addr_len);
638 #ifdef CONFIG_NET_POLL_CONTROLLER
639 static void virtnet_netpoll(struct net_device *dev)
641 struct virtnet_info *vi = netdev_priv(dev);
643 napi_schedule(&vi->napi);
647 static int virtnet_open(struct net_device *dev)
649 struct virtnet_info *vi = netdev_priv(dev);
651 napi_enable(&vi->napi);
653 /* If all buffers were filled by other side before we napi_enabled, we
654 * won't get another interrupt, so process any outstanding packets
655 * now. virtnet_poll wants re-enable the queue, so we disable here.
656 * We synchronize against interrupts via NAPI_STATE_SCHED */
657 if (napi_schedule_prep(&vi->napi)) {
658 vi->rvq->vq_ops->disable_cb(vi->rvq);
659 __napi_schedule(&vi->napi);
665 * Send command via the control virtqueue and check status. Commands
666 * supported by the hypervisor, as indicated by feature bits, should
667 * never fail unless improperly formated.
669 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
670 struct scatterlist *data, int out, int in)
672 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
673 struct virtio_net_ctrl_hdr ctrl;
674 virtio_net_ctrl_ack status = ~0;
678 /* Caller should know better */
679 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
680 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
682 out++; /* Add header */
683 in++; /* Add return status */
688 sg_init_table(sg, out + in);
690 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
691 for_each_sg(data, s, out + in - 2, i)
692 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
693 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
695 BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
697 vi->cvq->vq_ops->kick(vi->cvq);
700 * Spin for a response, the kick causes an ioport write, trapping
701 * into the hypervisor, so the request should be handled immediately.
703 while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp))
706 return status == VIRTIO_NET_OK;
709 static int virtnet_close(struct net_device *dev)
711 struct virtnet_info *vi = netdev_priv(dev);
713 napi_disable(&vi->napi);
718 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
720 struct virtnet_info *vi = netdev_priv(dev);
721 struct virtio_device *vdev = vi->vdev;
723 if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
726 return ethtool_op_set_tx_hw_csum(dev, data);
729 static void virtnet_set_rx_mode(struct net_device *dev)
731 struct virtnet_info *vi = netdev_priv(dev);
732 struct scatterlist sg[2];
733 u8 promisc, allmulti;
734 struct virtio_net_ctrl_mac *mac_data;
735 struct dev_addr_list *addr;
736 struct netdev_hw_addr *ha;
741 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
742 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
745 promisc = ((dev->flags & IFF_PROMISC) != 0);
746 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
748 sg_init_one(sg, &promisc, sizeof(promisc));
750 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
751 VIRTIO_NET_CTRL_RX_PROMISC,
753 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
754 promisc ? "en" : "dis");
756 sg_init_one(sg, &allmulti, sizeof(allmulti));
758 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
759 VIRTIO_NET_CTRL_RX_ALLMULTI,
761 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
762 allmulti ? "en" : "dis");
764 uc_count = netdev_uc_count(dev);
765 /* MAC filter - use one buffer for both lists */
766 mac_data = buf = kzalloc(((uc_count + dev->mc_count) * ETH_ALEN) +
767 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
769 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
773 sg_init_table(sg, 2);
775 /* Store the unicast list and count in the front of the buffer */
776 mac_data->entries = uc_count;
778 netdev_for_each_uc_addr(ha, dev)
779 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
781 sg_set_buf(&sg[0], mac_data,
782 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
784 /* multicast list and count fill the end */
785 mac_data = (void *)&mac_data->macs[uc_count][0];
787 mac_data->entries = dev->mc_count;
789 for (i = 0; i < dev->mc_count; i++, addr = addr->next)
790 memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN);
792 sg_set_buf(&sg[1], mac_data,
793 sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN));
795 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
796 VIRTIO_NET_CTRL_MAC_TABLE_SET,
798 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
803 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
805 struct virtnet_info *vi = netdev_priv(dev);
806 struct scatterlist sg;
808 sg_init_one(&sg, &vid, sizeof(vid));
810 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
811 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
812 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
815 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
817 struct virtnet_info *vi = netdev_priv(dev);
818 struct scatterlist sg;
820 sg_init_one(&sg, &vid, sizeof(vid));
822 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
823 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
824 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
827 static const struct ethtool_ops virtnet_ethtool_ops = {
828 .set_tx_csum = virtnet_set_tx_csum,
829 .set_sg = ethtool_op_set_sg,
830 .set_tso = ethtool_op_set_tso,
831 .set_ufo = ethtool_op_set_ufo,
832 .get_link = ethtool_op_get_link,
836 #define MAX_MTU 65535
838 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
840 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
846 static const struct net_device_ops virtnet_netdev = {
847 .ndo_open = virtnet_open,
848 .ndo_stop = virtnet_close,
849 .ndo_start_xmit = start_xmit,
850 .ndo_validate_addr = eth_validate_addr,
851 .ndo_set_mac_address = virtnet_set_mac_address,
852 .ndo_set_rx_mode = virtnet_set_rx_mode,
853 .ndo_change_mtu = virtnet_change_mtu,
854 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
855 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
856 #ifdef CONFIG_NET_POLL_CONTROLLER
857 .ndo_poll_controller = virtnet_netpoll,
861 static void virtnet_update_status(struct virtnet_info *vi)
865 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
868 vi->vdev->config->get(vi->vdev,
869 offsetof(struct virtio_net_config, status),
872 /* Ignore unknown (future) status bits */
873 v &= VIRTIO_NET_S_LINK_UP;
880 if (vi->status & VIRTIO_NET_S_LINK_UP) {
881 netif_carrier_on(vi->dev);
882 netif_wake_queue(vi->dev);
884 netif_carrier_off(vi->dev);
885 netif_stop_queue(vi->dev);
889 static void virtnet_config_changed(struct virtio_device *vdev)
891 struct virtnet_info *vi = vdev->priv;
893 virtnet_update_status(vi);
896 static int virtnet_probe(struct virtio_device *vdev)
899 struct net_device *dev;
900 struct virtnet_info *vi;
901 struct virtqueue *vqs[3];
902 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
903 const char *names[] = { "input", "output", "control" };
906 /* Allocate ourselves a network device with room for our info */
907 dev = alloc_etherdev(sizeof(struct virtnet_info));
911 /* Set up network device as normal. */
912 dev->netdev_ops = &virtnet_netdev;
913 dev->features = NETIF_F_HIGHDMA;
914 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
915 SET_NETDEV_DEV(dev, &vdev->dev);
917 /* Do we support "hardware" checksums? */
918 if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
919 /* This opens up the world of extra features. */
920 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
921 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
922 dev->features |= NETIF_F_TSO | NETIF_F_UFO
923 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
925 /* Individual feature bits: what can host handle? */
926 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
927 dev->features |= NETIF_F_TSO;
928 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
929 dev->features |= NETIF_F_TSO6;
930 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
931 dev->features |= NETIF_F_TSO_ECN;
932 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
933 dev->features |= NETIF_F_UFO;
936 /* Configuration may specify what MAC to use. Otherwise random. */
937 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
938 vdev->config->get(vdev,
939 offsetof(struct virtio_net_config, mac),
940 dev->dev_addr, dev->addr_len);
942 random_ether_addr(dev->dev_addr);
944 /* Set up our device-specific information */
945 vi = netdev_priv(dev);
946 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
951 INIT_DELAYED_WORK(&vi->refill, refill_work);
953 /* If we can receive ANY GSO packets, we must allocate large ones. */
954 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
955 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
956 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
957 vi->big_packets = true;
959 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
960 vi->mergeable_rx_bufs = true;
962 /* We expect two virtqueues, receive then send,
963 * and optionally control. */
964 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
966 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
973 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
976 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
977 dev->features |= NETIF_F_HW_VLAN_FILTER;
980 /* Initialize our empty send queue. */
981 skb_queue_head_init(&vi->send);
983 err = register_netdev(dev);
985 pr_debug("virtio_net: registering device failed\n");
989 /* Last of all, set up some receive buffers. */
990 try_fill_recv(vi, GFP_KERNEL);
992 /* If we didn't even get one input buffer, we're useless. */
998 vi->status = VIRTIO_NET_S_LINK_UP;
999 virtnet_update_status(vi);
1000 netif_carrier_on(dev);
1002 pr_debug("virtnet: registered device %s\n", dev->name);
1006 unregister_netdev(dev);
1007 cancel_delayed_work_sync(&vi->refill);
1009 vdev->config->del_vqs(vdev);
1015 static void free_unused_bufs(struct virtnet_info *vi)
1019 buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq);
1022 if (vi->mergeable_rx_bufs || vi->big_packets)
1023 give_pages(vi, buf);
1028 BUG_ON(vi->num != 0);
1031 static void __devexit virtnet_remove(struct virtio_device *vdev)
1033 struct virtnet_info *vi = vdev->priv;
1035 /* Stop all the virtqueues. */
1036 vdev->config->reset(vdev);
1038 /* Free our skbs in send queue, if any. */
1039 __skb_queue_purge(&vi->send);
1041 unregister_netdev(vi->dev);
1042 cancel_delayed_work_sync(&vi->refill);
1043 free_unused_bufs(vi);
1045 vdev->config->del_vqs(vi->vdev);
1048 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1050 free_netdev(vi->dev);
1053 static struct virtio_device_id id_table[] = {
1054 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1058 static unsigned int features[] = {
1059 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1060 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1061 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1062 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1063 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1064 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1065 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1068 static struct virtio_driver virtio_net_driver = {
1069 .feature_table = features,
1070 .feature_table_size = ARRAY_SIZE(features),
1071 .driver.name = KBUILD_MODNAME,
1072 .driver.owner = THIS_MODULE,
1073 .id_table = id_table,
1074 .probe = virtnet_probe,
1075 .remove = __devexit_p(virtnet_remove),
1076 .config_changed = virtnet_config_changed,
1079 static int __init init(void)
1081 return register_virtio_driver(&virtio_net_driver);
1084 static void __exit fini(void)
1086 unregister_virtio_driver(&virtio_net_driver);
1091 MODULE_DEVICE_TABLE(virtio, id_table);
1092 MODULE_DESCRIPTION("Virtio network driver");
1093 MODULE_LICENSE("GPL");