1 /* A simple 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_ids.h>
26 #include <linux/virtio_net.h>
27 #include <linux/scatterlist.h>
28 #include <linux/if_vlan.h>
30 static int napi_weight = 128;
31 module_param(napi_weight, int, 0444);
33 static int csum = 1, gso = 1;
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
45 struct virtio_device *vdev;
46 struct virtqueue *rvq, *svq, *cvq;
47 struct net_device *dev;
48 struct napi_struct napi;
51 /* Number of input buffers, and max we've ever had. */
52 unsigned int num, max;
54 /* I like... big packets and I cannot lie! */
57 /* Host will merge rx buffers for big packets (shake it! shake it!) */
58 bool mergeable_rx_bufs;
60 /* Receive & send queues. */
61 struct sk_buff_head recv;
62 struct sk_buff_head send;
64 /* Work struct for refilling if we run low on memory. */
65 struct delayed_work refill;
67 /* Chain pages by the private ptr. */
73 struct virtio_net_hdr hdr;
74 struct virtio_net_hdr_mrg_rxbuf mhdr;
78 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
80 return (struct skb_vnet_hdr *)skb->cb;
83 static void give_a_page(struct virtnet_info *vi, struct page *page)
85 page->private = (unsigned long)vi->pages;
89 static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb)
93 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
94 give_a_page(vi, skb_shinfo(skb)->frags[i].page);
95 skb_shinfo(skb)->nr_frags = 0;
99 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
101 struct page *p = vi->pages;
104 vi->pages = (struct page *)p->private;
106 p = alloc_page(gfp_mask);
110 static void skb_xmit_done(struct virtqueue *svq)
112 struct virtnet_info *vi = svq->vdev->priv;
114 /* Suppress further interrupts. */
115 svq->vq_ops->disable_cb(svq);
117 /* We were probably waiting for more output buffers. */
118 netif_wake_queue(vi->dev);
121 static void receive_skb(struct net_device *dev, struct sk_buff *skb,
124 struct virtnet_info *vi = netdev_priv(dev);
125 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
129 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
130 pr_debug("%s: short packet %i\n", dev->name, len);
131 dev->stats.rx_length_errors++;
135 if (vi->mergeable_rx_bufs) {
137 char *p = page_address(skb_shinfo(skb)->frags[0].page);
141 len -= sizeof(struct virtio_net_hdr_mrg_rxbuf);
143 memcpy(&hdr->mhdr, p, sizeof(hdr->mhdr));
144 p += sizeof(hdr->mhdr);
147 if (copy > skb_tailroom(skb))
148 copy = skb_tailroom(skb);
150 memcpy(skb_put(skb, copy), p, copy);
155 give_a_page(vi, skb_shinfo(skb)->frags[0].page);
156 skb_shinfo(skb)->nr_frags--;
158 skb_shinfo(skb)->frags[0].page_offset +=
159 sizeof(hdr->mhdr) + copy;
160 skb_shinfo(skb)->frags[0].size = len;
161 skb->data_len += len;
165 while (--hdr->mhdr.num_buffers) {
166 struct sk_buff *nskb;
168 i = skb_shinfo(skb)->nr_frags;
169 if (i >= MAX_SKB_FRAGS) {
170 pr_debug("%s: packet too long %d\n", dev->name,
172 dev->stats.rx_length_errors++;
176 nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
178 pr_debug("%s: rx error: %d buffers missing\n",
179 dev->name, hdr->mhdr.num_buffers);
180 dev->stats.rx_length_errors++;
184 __skb_unlink(nskb, &vi->recv);
187 skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0];
188 skb_shinfo(nskb)->nr_frags = 0;
194 skb_shinfo(skb)->frags[i].size = len;
195 skb_shinfo(skb)->nr_frags++;
196 skb->data_len += len;
200 len -= sizeof(hdr->hdr);
202 if (len <= MAX_PACKET_LEN)
205 err = pskb_trim(skb, len);
207 pr_debug("%s: pskb_trim failed %i %d\n", dev->name,
209 dev->stats.rx_dropped++;
214 skb->truesize += skb->data_len;
215 dev->stats.rx_bytes += skb->len;
216 dev->stats.rx_packets++;
218 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
219 pr_debug("Needs csum!\n");
220 if (!skb_partial_csum_set(skb,
222 hdr->hdr.csum_offset))
226 skb->protocol = eth_type_trans(skb, dev);
227 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
228 ntohs(skb->protocol), skb->len, skb->pkt_type);
230 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
232 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
233 case VIRTIO_NET_HDR_GSO_TCPV4:
234 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
236 case VIRTIO_NET_HDR_GSO_UDP:
237 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
239 case VIRTIO_NET_HDR_GSO_TCPV6:
240 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
244 printk(KERN_WARNING "%s: bad gso type %u.\n",
245 dev->name, hdr->hdr.gso_type);
249 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
250 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
252 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
253 if (skb_shinfo(skb)->gso_size == 0) {
255 printk(KERN_WARNING "%s: zero gso size.\n",
260 /* Header must be checked, and gso_segs computed. */
261 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
262 skb_shinfo(skb)->gso_segs = 0;
265 netif_receive_skb(skb);
269 dev->stats.rx_frame_errors++;
274 static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
277 struct scatterlist sg[2+MAX_SKB_FRAGS];
281 sg_init_table(sg, 2+MAX_SKB_FRAGS);
283 struct skb_vnet_hdr *hdr;
285 skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN);
286 if (unlikely(!skb)) {
291 skb_reserve(skb, NET_IP_ALIGN);
292 skb_put(skb, MAX_PACKET_LEN);
294 hdr = skb_vnet_hdr(skb);
295 sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
297 if (vi->big_packets) {
298 for (i = 0; i < MAX_SKB_FRAGS; i++) {
299 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
300 f->page = get_a_page(vi, gfp);
307 skb->data_len += PAGE_SIZE;
308 skb->len += PAGE_SIZE;
310 skb_shinfo(skb)->nr_frags++;
314 num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
315 skb_queue_head(&vi->recv, skb);
317 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
319 skb_unlink(skb, &vi->recv);
326 if (unlikely(vi->num > vi->max))
328 vi->rvq->vq_ops->kick(vi->rvq);
332 /* Returns false if we couldn't fill entirely (OOM). */
333 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
336 struct scatterlist sg[1];
340 if (!vi->mergeable_rx_bufs)
341 return try_fill_recv_maxbufs(vi, gfp);
346 skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN);
347 if (unlikely(!skb)) {
352 skb_reserve(skb, NET_IP_ALIGN);
354 f = &skb_shinfo(skb)->frags[0];
355 f->page = get_a_page(vi, gfp);
365 skb_shinfo(skb)->nr_frags++;
367 sg_init_one(sg, page_address(f->page), PAGE_SIZE);
368 skb_queue_head(&vi->recv, skb);
370 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb);
372 skb_unlink(skb, &vi->recv);
378 if (unlikely(vi->num > vi->max))
380 vi->rvq->vq_ops->kick(vi->rvq);
384 static void skb_recv_done(struct virtqueue *rvq)
386 struct virtnet_info *vi = rvq->vdev->priv;
387 /* Schedule NAPI, Suppress further interrupts if successful. */
388 if (napi_schedule_prep(&vi->napi)) {
389 rvq->vq_ops->disable_cb(rvq);
390 __napi_schedule(&vi->napi);
394 static void refill_work(struct work_struct *work)
396 struct virtnet_info *vi;
399 vi = container_of(work, struct virtnet_info, refill.work);
400 napi_disable(&vi->napi);
401 try_fill_recv(vi, GFP_KERNEL);
402 still_empty = (vi->num == 0);
403 napi_enable(&vi->napi);
405 /* In theory, this can happen: if we don't get any buffers in
406 * we will *never* try to fill again. */
408 schedule_delayed_work(&vi->refill, HZ/2);
411 static int virtnet_poll(struct napi_struct *napi, int budget)
413 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
414 struct sk_buff *skb = NULL;
415 unsigned int len, received = 0;
418 while (received < budget &&
419 (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
420 __skb_unlink(skb, &vi->recv);
421 receive_skb(vi->dev, skb, len);
426 if (vi->num < vi->max / 2) {
427 if (!try_fill_recv(vi, GFP_ATOMIC))
428 schedule_delayed_work(&vi->refill, 0);
431 /* Out of packets? */
432 if (received < budget) {
434 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq))
435 && napi_schedule_prep(napi)) {
436 vi->rvq->vq_ops->disable_cb(vi->rvq);
437 __napi_schedule(napi);
445 static void free_old_xmit_skbs(struct virtnet_info *vi)
450 while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
451 pr_debug("Sent skb %p\n", skb);
452 __skb_unlink(skb, &vi->send);
453 vi->dev->stats.tx_bytes += skb->len;
454 vi->dev->stats.tx_packets++;
459 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
462 struct scatterlist sg[2+MAX_SKB_FRAGS];
463 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
464 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
466 sg_init_table(sg, 2+MAX_SKB_FRAGS);
468 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
470 if (skb->ip_summed == CHECKSUM_PARTIAL) {
471 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
472 hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
473 hdr->hdr.csum_offset = skb->csum_offset;
476 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
479 if (skb_is_gso(skb)) {
480 hdr->hdr.hdr_len = skb_headlen(skb);
481 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
482 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
483 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
484 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
485 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
486 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
487 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
490 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
491 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
493 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
494 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
497 hdr->mhdr.num_buffers = 0;
499 /* Encode metadata header at front. */
500 if (vi->mergeable_rx_bufs)
501 sg_set_buf(sg, &hdr->mhdr, sizeof(hdr->mhdr));
503 sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
505 num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
506 return vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
509 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
511 struct virtnet_info *vi = netdev_priv(dev);
514 /* Free up any pending old buffers before queueing new ones. */
515 free_old_xmit_skbs(vi);
517 /* Put new one in send queue and do transmit */
518 __skb_queue_head(&vi->send, skb);
519 if (likely(xmit_skb(vi, skb) >= 0)) {
520 vi->svq->vq_ops->kick(vi->svq);
521 /* Don't wait up for transmitted skbs to be freed. */
527 /* Ring too full for this packet, remove it from queue again. */
528 pr_debug("%s: virtio not prepared to send\n", dev->name);
529 __skb_unlink(skb, &vi->send);
530 netif_stop_queue(dev);
532 /* Activate callback for using skbs: if this returns false it
533 * means some were used in the meantime. */
534 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
535 vi->svq->vq_ops->disable_cb(vi->svq);
536 netif_start_queue(dev);
539 return NETDEV_TX_BUSY;
542 static int virtnet_set_mac_address(struct net_device *dev, void *p)
544 struct virtnet_info *vi = netdev_priv(dev);
545 struct virtio_device *vdev = vi->vdev;
548 ret = eth_mac_addr(dev, p);
552 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
553 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
554 dev->dev_addr, dev->addr_len);
559 #ifdef CONFIG_NET_POLL_CONTROLLER
560 static void virtnet_netpoll(struct net_device *dev)
562 struct virtnet_info *vi = netdev_priv(dev);
564 napi_schedule(&vi->napi);
568 static int virtnet_open(struct net_device *dev)
570 struct virtnet_info *vi = netdev_priv(dev);
572 napi_enable(&vi->napi);
574 /* If all buffers were filled by other side before we napi_enabled, we
575 * won't get another interrupt, so process any outstanding packets
576 * now. virtnet_poll wants re-enable the queue, so we disable here.
577 * We synchronize against interrupts via NAPI_STATE_SCHED */
578 if (napi_schedule_prep(&vi->napi)) {
579 vi->rvq->vq_ops->disable_cb(vi->rvq);
580 __napi_schedule(&vi->napi);
586 * Send command via the control virtqueue and check status. Commands
587 * supported by the hypervisor, as indicated by feature bits, should
588 * never fail unless improperly formated.
590 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
591 struct scatterlist *data, int out, int in)
593 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
594 struct virtio_net_ctrl_hdr ctrl;
595 virtio_net_ctrl_ack status = ~0;
599 /* Caller should know better */
600 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
601 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
603 out++; /* Add header */
604 in++; /* Add return status */
609 sg_init_table(sg, out + in);
611 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
612 for_each_sg(data, s, out + in - 2, i)
613 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
614 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
616 BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
618 vi->cvq->vq_ops->kick(vi->cvq);
621 * Spin for a response, the kick causes an ioport write, trapping
622 * into the hypervisor, so the request should be handled immediately.
624 while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp))
627 return status == VIRTIO_NET_OK;
630 static int virtnet_close(struct net_device *dev)
632 struct virtnet_info *vi = netdev_priv(dev);
634 napi_disable(&vi->napi);
639 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
641 struct virtnet_info *vi = netdev_priv(dev);
642 struct virtio_device *vdev = vi->vdev;
644 if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
647 return ethtool_op_set_tx_hw_csum(dev, data);
650 static void virtnet_set_rx_mode(struct net_device *dev)
652 struct virtnet_info *vi = netdev_priv(dev);
653 struct scatterlist sg[2];
654 u8 promisc, allmulti;
655 struct virtio_net_ctrl_mac *mac_data;
656 struct dev_addr_list *addr;
657 struct netdev_hw_addr *ha;
661 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
662 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
665 promisc = ((dev->flags & IFF_PROMISC) != 0);
666 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
668 sg_init_one(sg, &promisc, sizeof(promisc));
670 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
671 VIRTIO_NET_CTRL_RX_PROMISC,
673 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
674 promisc ? "en" : "dis");
676 sg_init_one(sg, &allmulti, sizeof(allmulti));
678 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
679 VIRTIO_NET_CTRL_RX_ALLMULTI,
681 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
682 allmulti ? "en" : "dis");
684 /* MAC filter - use one buffer for both lists */
685 mac_data = buf = kzalloc(((dev->uc.count + dev->mc_count) * ETH_ALEN) +
686 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
688 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
692 sg_init_table(sg, 2);
694 /* Store the unicast list and count in the front of the buffer */
695 mac_data->entries = dev->uc.count;
697 list_for_each_entry(ha, &dev->uc.list, list)
698 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
700 sg_set_buf(&sg[0], mac_data,
701 sizeof(mac_data->entries) + (dev->uc.count * ETH_ALEN));
703 /* multicast list and count fill the end */
704 mac_data = (void *)&mac_data->macs[dev->uc.count][0];
706 mac_data->entries = dev->mc_count;
708 for (i = 0; i < dev->mc_count; i++, addr = addr->next)
709 memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN);
711 sg_set_buf(&sg[1], mac_data,
712 sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN));
714 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
715 VIRTIO_NET_CTRL_MAC_TABLE_SET,
717 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
722 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
724 struct virtnet_info *vi = netdev_priv(dev);
725 struct scatterlist sg;
727 sg_init_one(&sg, &vid, sizeof(vid));
729 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
730 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
731 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
734 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
736 struct virtnet_info *vi = netdev_priv(dev);
737 struct scatterlist sg;
739 sg_init_one(&sg, &vid, sizeof(vid));
741 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
742 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
743 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
746 static const struct ethtool_ops virtnet_ethtool_ops = {
747 .set_tx_csum = virtnet_set_tx_csum,
748 .set_sg = ethtool_op_set_sg,
749 .set_tso = ethtool_op_set_tso,
750 .set_ufo = ethtool_op_set_ufo,
751 .get_link = ethtool_op_get_link,
755 #define MAX_MTU 65535
757 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
759 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
765 static const struct net_device_ops virtnet_netdev = {
766 .ndo_open = virtnet_open,
767 .ndo_stop = virtnet_close,
768 .ndo_start_xmit = start_xmit,
769 .ndo_validate_addr = eth_validate_addr,
770 .ndo_set_mac_address = virtnet_set_mac_address,
771 .ndo_set_rx_mode = virtnet_set_rx_mode,
772 .ndo_change_mtu = virtnet_change_mtu,
773 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
774 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
775 #ifdef CONFIG_NET_POLL_CONTROLLER
776 .ndo_poll_controller = virtnet_netpoll,
780 static void virtnet_update_status(struct virtnet_info *vi)
784 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
787 vi->vdev->config->get(vi->vdev,
788 offsetof(struct virtio_net_config, status),
791 /* Ignore unknown (future) status bits */
792 v &= VIRTIO_NET_S_LINK_UP;
799 if (vi->status & VIRTIO_NET_S_LINK_UP) {
800 netif_carrier_on(vi->dev);
801 netif_wake_queue(vi->dev);
803 netif_carrier_off(vi->dev);
804 netif_stop_queue(vi->dev);
808 static void virtnet_config_changed(struct virtio_device *vdev)
810 struct virtnet_info *vi = vdev->priv;
812 virtnet_update_status(vi);
815 static int virtnet_probe(struct virtio_device *vdev)
818 struct net_device *dev;
819 struct virtnet_info *vi;
820 struct virtqueue *vqs[3];
821 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
822 const char *names[] = { "input", "output", "control" };
825 /* Allocate ourselves a network device with room for our info */
826 dev = alloc_etherdev(sizeof(struct virtnet_info));
830 /* Set up network device as normal. */
831 dev->netdev_ops = &virtnet_netdev;
832 dev->features = NETIF_F_HIGHDMA;
833 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
834 SET_NETDEV_DEV(dev, &vdev->dev);
836 /* Do we support "hardware" checksums? */
837 if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
838 /* This opens up the world of extra features. */
839 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
840 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
841 dev->features |= NETIF_F_TSO | NETIF_F_UFO
842 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
844 /* Individual feature bits: what can host handle? */
845 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
846 dev->features |= NETIF_F_TSO;
847 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
848 dev->features |= NETIF_F_TSO6;
849 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
850 dev->features |= NETIF_F_TSO_ECN;
851 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
852 dev->features |= NETIF_F_UFO;
855 /* Configuration may specify what MAC to use. Otherwise random. */
856 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
857 vdev->config->get(vdev,
858 offsetof(struct virtio_net_config, mac),
859 dev->dev_addr, dev->addr_len);
861 random_ether_addr(dev->dev_addr);
863 /* Set up our device-specific information */
864 vi = netdev_priv(dev);
865 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
870 INIT_DELAYED_WORK(&vi->refill, refill_work);
872 /* If we can receive ANY GSO packets, we must allocate large ones. */
873 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
874 || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
875 || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
876 vi->big_packets = true;
878 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
879 vi->mergeable_rx_bufs = true;
881 /* We expect two virtqueues, receive then send,
882 * and optionally control. */
883 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
885 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
892 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
895 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
896 dev->features |= NETIF_F_HW_VLAN_FILTER;
899 /* Initialize our empty receive and send queues. */
900 skb_queue_head_init(&vi->recv);
901 skb_queue_head_init(&vi->send);
903 err = register_netdev(dev);
905 pr_debug("virtio_net: registering device failed\n");
909 /* Last of all, set up some receive buffers. */
910 try_fill_recv(vi, GFP_KERNEL);
912 /* If we didn't even get one input buffer, we're useless. */
918 vi->status = VIRTIO_NET_S_LINK_UP;
919 virtnet_update_status(vi);
920 netif_carrier_on(dev);
922 pr_debug("virtnet: registered device %s\n", dev->name);
926 unregister_netdev(dev);
927 cancel_delayed_work_sync(&vi->refill);
929 vdev->config->del_vqs(vdev);
935 static void virtnet_remove(struct virtio_device *vdev)
937 struct virtnet_info *vi = vdev->priv;
940 /* Stop all the virtqueues. */
941 vdev->config->reset(vdev);
943 /* Free our skbs in send and recv queues, if any. */
944 while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
948 __skb_queue_purge(&vi->send);
950 BUG_ON(vi->num != 0);
952 unregister_netdev(vi->dev);
953 cancel_delayed_work_sync(&vi->refill);
955 vdev->config->del_vqs(vi->vdev);
958 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
960 free_netdev(vi->dev);
963 static struct virtio_device_id id_table[] = {
964 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
968 static unsigned int features[] = {
969 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
970 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
971 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
972 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
973 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
974 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
975 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
978 static struct virtio_driver virtio_net = {
979 .feature_table = features,
980 .feature_table_size = ARRAY_SIZE(features),
981 .driver.name = KBUILD_MODNAME,
982 .driver.owner = THIS_MODULE,
983 .id_table = id_table,
984 .probe = virtnet_probe,
985 .remove = __devexit_p(virtnet_remove),
986 .config_changed = virtnet_config_changed,
989 static int __init init(void)
991 return register_virtio_driver(&virtio_net);
994 static void __exit fini(void)
996 unregister_virtio_driver(&virtio_net);
1001 MODULE_DEVICE_TABLE(virtio, id_table);
1002 MODULE_DESCRIPTION("Virtio network driver");
1003 MODULE_LICENSE("GPL");