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;
59 /* Work struct for refilling if we run low on memory. */
60 struct delayed_work refill;
62 /* Chain pages by the private ptr. */
68 struct virtio_net_hdr hdr;
69 struct virtio_net_hdr_mrg_rxbuf mhdr;
74 struct padded_vnet_hdr {
75 struct virtio_net_hdr hdr;
77 * virtio_net_hdr should be in a separated sg buffer because of a
78 * QEMU bug, and data sg buffer shares same page with this header sg.
79 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
84 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
86 return (struct skb_vnet_hdr *)skb->cb;
90 * private is used to chain pages for big packets, put the whole
91 * most recent used list in the beginning for reuse
93 static void give_pages(struct virtnet_info *vi, struct page *page)
97 /* Find end of list, sew whole thing into vi->pages. */
98 for (end = page; end->private; end = (struct page *)end->private);
99 end->private = (unsigned long)vi->pages;
103 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
105 struct page *p = vi->pages;
108 vi->pages = (struct page *)p->private;
109 /* clear private here, it is used to chain pages */
112 p = alloc_page(gfp_mask);
116 static void skb_xmit_done(struct virtqueue *svq)
118 struct virtnet_info *vi = svq->vdev->priv;
120 /* Suppress further interrupts. */
121 svq->vq_ops->disable_cb(svq);
123 /* We were probably waiting for more output buffers. */
124 netif_wake_queue(vi->dev);
127 static void set_skb_frag(struct sk_buff *skb, struct page *page,
128 unsigned int offset, unsigned int *len)
130 int i = skb_shinfo(skb)->nr_frags;
133 f = &skb_shinfo(skb)->frags[i];
134 f->size = min((unsigned)PAGE_SIZE - offset, *len);
135 f->page_offset = offset;
138 skb->data_len += f->size;
140 skb_shinfo(skb)->nr_frags++;
144 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
145 struct page *page, unsigned int len)
148 struct skb_vnet_hdr *hdr;
149 unsigned int copy, hdr_len, offset;
152 p = page_address(page);
154 /* copy small packet so we can reuse these pages for small data */
155 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
159 hdr = skb_vnet_hdr(skb);
161 if (vi->mergeable_rx_bufs) {
162 hdr_len = sizeof hdr->mhdr;
165 hdr_len = sizeof hdr->hdr;
166 offset = sizeof(struct padded_vnet_hdr);
169 memcpy(hdr, p, hdr_len);
175 if (copy > skb_tailroom(skb))
176 copy = skb_tailroom(skb);
177 memcpy(skb_put(skb, copy), p, copy);
183 set_skb_frag(skb, page, offset, &len);
184 page = (struct page *)page->private;
189 give_pages(vi, page);
194 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
196 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
200 num_buf = hdr->mhdr.num_buffers;
202 i = skb_shinfo(skb)->nr_frags;
203 if (i >= MAX_SKB_FRAGS) {
204 pr_debug("%s: packet too long\n", skb->dev->name);
205 skb->dev->stats.rx_length_errors++;
209 page = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
211 pr_debug("%s: rx error: %d buffers missing\n",
212 skb->dev->name, hdr->mhdr.num_buffers);
213 skb->dev->stats.rx_length_errors++;
219 set_skb_frag(skb, page, 0, &len);
226 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
228 struct virtnet_info *vi = netdev_priv(dev);
231 struct skb_vnet_hdr *hdr;
233 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
234 pr_debug("%s: short packet %i\n", dev->name, len);
235 dev->stats.rx_length_errors++;
236 if (vi->mergeable_rx_bufs || vi->big_packets)
243 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
245 len -= sizeof(struct virtio_net_hdr);
249 skb = page_to_skb(vi, page, len);
250 if (unlikely(!skb)) {
251 dev->stats.rx_dropped++;
252 give_pages(vi, page);
255 if (vi->mergeable_rx_bufs)
256 if (receive_mergeable(vi, skb)) {
262 hdr = skb_vnet_hdr(skb);
263 skb->truesize += skb->data_len;
264 dev->stats.rx_bytes += skb->len;
265 dev->stats.rx_packets++;
267 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
268 pr_debug("Needs csum!\n");
269 if (!skb_partial_csum_set(skb,
271 hdr->hdr.csum_offset))
275 skb->protocol = eth_type_trans(skb, dev);
276 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
277 ntohs(skb->protocol), skb->len, skb->pkt_type);
279 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
281 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
282 case VIRTIO_NET_HDR_GSO_TCPV4:
283 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
285 case VIRTIO_NET_HDR_GSO_UDP:
286 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
288 case VIRTIO_NET_HDR_GSO_TCPV6:
289 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
293 printk(KERN_WARNING "%s: bad gso type %u.\n",
294 dev->name, hdr->hdr.gso_type);
298 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
299 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
301 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
302 if (skb_shinfo(skb)->gso_size == 0) {
304 printk(KERN_WARNING "%s: zero gso size.\n",
309 /* Header must be checked, and gso_segs computed. */
310 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
311 skb_shinfo(skb)->gso_segs = 0;
314 netif_receive_skb(skb);
318 dev->stats.rx_frame_errors++;
322 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
325 struct skb_vnet_hdr *hdr;
326 struct scatterlist sg[2];
329 sg_init_table(sg, 2);
330 skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
334 skb_put(skb, MAX_PACKET_LEN);
336 hdr = skb_vnet_hdr(skb);
337 sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
339 skb_to_sgvec(skb, sg + 1, 0, skb->len);
341 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb);
348 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
350 struct scatterlist sg[MAX_SKB_FRAGS + 2];
351 struct page *first, *list = NULL;
355 sg_init_table(sg, MAX_SKB_FRAGS + 2);
356 /* page in sg[MAX_SKB_FRAGS + 1] is list tail */
357 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
358 first = get_a_page(vi, gfp);
361 give_pages(vi, list);
364 sg_set_buf(&sg[i], page_address(first), PAGE_SIZE);
366 /* chain new page in list head to match sg */
367 first->private = (unsigned long)list;
371 first = get_a_page(vi, gfp);
373 give_pages(vi, list);
376 p = page_address(first);
378 /* sg[0], sg[1] share the same page */
379 /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/
380 sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr));
382 /* sg[1] for data packet, from offset */
383 offset = sizeof(struct padded_vnet_hdr);
384 sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset);
386 /* chain first in list head */
387 first->private = (unsigned long)list;
388 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2,
391 give_pages(vi, first);
396 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
399 struct scatterlist sg;
402 page = get_a_page(vi, gfp);
406 sg_init_one(&sg, page_address(page), PAGE_SIZE);
408 err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page);
410 give_pages(vi, page);
415 /* Returns false if we couldn't fill entirely (OOM). */
416 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
422 if (vi->mergeable_rx_bufs)
423 err = add_recvbuf_mergeable(vi, gfp);
424 else if (vi->big_packets)
425 err = add_recvbuf_big(vi, gfp);
427 err = add_recvbuf_small(vi, gfp);
435 if (unlikely(vi->num > vi->max))
437 vi->rvq->vq_ops->kick(vi->rvq);
441 static void skb_recv_done(struct virtqueue *rvq)
443 struct virtnet_info *vi = rvq->vdev->priv;
444 /* Schedule NAPI, Suppress further interrupts if successful. */
445 if (napi_schedule_prep(&vi->napi)) {
446 rvq->vq_ops->disable_cb(rvq);
447 __napi_schedule(&vi->napi);
451 static void refill_work(struct work_struct *work)
453 struct virtnet_info *vi;
456 vi = container_of(work, struct virtnet_info, refill.work);
457 napi_disable(&vi->napi);
458 still_empty = !try_fill_recv(vi, GFP_KERNEL);
459 napi_enable(&vi->napi);
461 /* In theory, this can happen: if we don't get any buffers in
462 * we will *never* try to fill again. */
464 schedule_delayed_work(&vi->refill, HZ/2);
467 static int virtnet_poll(struct napi_struct *napi, int budget)
469 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
471 unsigned int len, received = 0;
474 while (received < budget &&
475 (buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
476 receive_buf(vi->dev, buf, len);
481 if (vi->num < vi->max / 2) {
482 if (!try_fill_recv(vi, GFP_ATOMIC))
483 schedule_delayed_work(&vi->refill, 0);
486 /* Out of packets? */
487 if (received < budget) {
489 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) &&
490 napi_schedule_prep(napi)) {
491 vi->rvq->vq_ops->disable_cb(vi->rvq);
492 __napi_schedule(napi);
500 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
503 unsigned int len, tot_sgs = 0;
505 while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
506 pr_debug("Sent skb %p\n", skb);
507 vi->dev->stats.tx_bytes += skb->len;
508 vi->dev->stats.tx_packets++;
509 tot_sgs += skb_vnet_hdr(skb)->num_sg;
510 dev_kfree_skb_any(skb);
515 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
517 struct scatterlist sg[2+MAX_SKB_FRAGS];
518 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
519 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
521 sg_init_table(sg, 2+MAX_SKB_FRAGS);
523 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
525 if (skb->ip_summed == CHECKSUM_PARTIAL) {
526 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
527 hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
528 hdr->hdr.csum_offset = skb->csum_offset;
531 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
534 if (skb_is_gso(skb)) {
535 hdr->hdr.hdr_len = skb_headlen(skb);
536 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
537 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
538 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
539 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
540 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
541 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
542 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
545 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
546 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
548 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
549 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
552 hdr->mhdr.num_buffers = 0;
554 /* Encode metadata header at front. */
555 if (vi->mergeable_rx_bufs)
556 sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr);
558 sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
560 hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
561 return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
564 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
566 struct virtnet_info *vi = netdev_priv(dev);
570 /* Free up any pending old buffers before queueing new ones. */
571 free_old_xmit_skbs(vi);
573 /* Try to transmit */
574 capacity = xmit_skb(vi, skb);
576 /* This can happen with OOM and indirect buffers. */
577 if (unlikely(capacity < 0)) {
578 netif_stop_queue(dev);
579 dev_warn(&dev->dev, "Unexpected full queue\n");
580 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
581 vi->svq->vq_ops->disable_cb(vi->svq);
582 netif_start_queue(dev);
585 return NETDEV_TX_BUSY;
587 vi->svq->vq_ops->kick(vi->svq);
589 /* Don't wait up for transmitted skbs to be freed. */
593 /* Apparently nice girls don't return TX_BUSY; stop the queue
594 * before it gets out of hand. Naturally, this wastes entries. */
595 if (capacity < 2+MAX_SKB_FRAGS) {
596 netif_stop_queue(dev);
597 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
598 /* More just got used, free them then recheck. */
599 capacity += free_old_xmit_skbs(vi);
600 if (capacity >= 2+MAX_SKB_FRAGS) {
601 netif_start_queue(dev);
602 vi->svq->vq_ops->disable_cb(vi->svq);
610 static int virtnet_set_mac_address(struct net_device *dev, void *p)
612 struct virtnet_info *vi = netdev_priv(dev);
613 struct virtio_device *vdev = vi->vdev;
616 ret = eth_mac_addr(dev, p);
620 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
621 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
622 dev->dev_addr, dev->addr_len);
627 #ifdef CONFIG_NET_POLL_CONTROLLER
628 static void virtnet_netpoll(struct net_device *dev)
630 struct virtnet_info *vi = netdev_priv(dev);
632 napi_schedule(&vi->napi);
636 static int virtnet_open(struct net_device *dev)
638 struct virtnet_info *vi = netdev_priv(dev);
640 napi_enable(&vi->napi);
642 /* If all buffers were filled by other side before we napi_enabled, we
643 * won't get another interrupt, so process any outstanding packets
644 * now. virtnet_poll wants re-enable the queue, so we disable here.
645 * We synchronize against interrupts via NAPI_STATE_SCHED */
646 if (napi_schedule_prep(&vi->napi)) {
647 vi->rvq->vq_ops->disable_cb(vi->rvq);
648 __napi_schedule(&vi->napi);
654 * Send command via the control virtqueue and check status. Commands
655 * supported by the hypervisor, as indicated by feature bits, should
656 * never fail unless improperly formated.
658 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
659 struct scatterlist *data, int out, int in)
661 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
662 struct virtio_net_ctrl_hdr ctrl;
663 virtio_net_ctrl_ack status = ~0;
667 /* Caller should know better */
668 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
669 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
671 out++; /* Add header */
672 in++; /* Add return status */
677 sg_init_table(sg, out + in);
679 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
680 for_each_sg(data, s, out + in - 2, i)
681 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
682 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
684 BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
686 vi->cvq->vq_ops->kick(vi->cvq);
689 * Spin for a response, the kick causes an ioport write, trapping
690 * into the hypervisor, so the request should be handled immediately.
692 while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp))
695 return status == VIRTIO_NET_OK;
698 static int virtnet_close(struct net_device *dev)
700 struct virtnet_info *vi = netdev_priv(dev);
702 napi_disable(&vi->napi);
707 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
709 struct virtnet_info *vi = netdev_priv(dev);
710 struct virtio_device *vdev = vi->vdev;
712 if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
715 return ethtool_op_set_tx_hw_csum(dev, data);
718 static void virtnet_set_rx_mode(struct net_device *dev)
720 struct virtnet_info *vi = netdev_priv(dev);
721 struct scatterlist sg[2];
722 u8 promisc, allmulti;
723 struct virtio_net_ctrl_mac *mac_data;
724 struct dev_addr_list *addr;
725 struct netdev_hw_addr *ha;
731 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
732 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
735 promisc = ((dev->flags & IFF_PROMISC) != 0);
736 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
738 sg_init_one(sg, &promisc, sizeof(promisc));
740 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
741 VIRTIO_NET_CTRL_RX_PROMISC,
743 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
744 promisc ? "en" : "dis");
746 sg_init_one(sg, &allmulti, sizeof(allmulti));
748 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
749 VIRTIO_NET_CTRL_RX_ALLMULTI,
751 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
752 allmulti ? "en" : "dis");
754 uc_count = netdev_uc_count(dev);
755 mc_count = netdev_mc_count(dev);
756 /* MAC filter - use one buffer for both lists */
757 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
758 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
761 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
765 sg_init_table(sg, 2);
767 /* Store the unicast list and count in the front of the buffer */
768 mac_data->entries = uc_count;
770 netdev_for_each_uc_addr(ha, dev)
771 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
773 sg_set_buf(&sg[0], mac_data,
774 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
776 /* multicast list and count fill the end */
777 mac_data = (void *)&mac_data->macs[uc_count][0];
779 mac_data->entries = mc_count;
781 netdev_for_each_mc_addr(addr, dev)
782 memcpy(&mac_data->macs[i++][0], addr->da_addr, ETH_ALEN);
784 sg_set_buf(&sg[1], mac_data,
785 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
787 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
788 VIRTIO_NET_CTRL_MAC_TABLE_SET,
790 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
795 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
797 struct virtnet_info *vi = netdev_priv(dev);
798 struct scatterlist sg;
800 sg_init_one(&sg, &vid, sizeof(vid));
802 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
803 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
804 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
807 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
809 struct virtnet_info *vi = netdev_priv(dev);
810 struct scatterlist sg;
812 sg_init_one(&sg, &vid, sizeof(vid));
814 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
815 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
816 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
819 static const struct ethtool_ops virtnet_ethtool_ops = {
820 .set_tx_csum = virtnet_set_tx_csum,
821 .set_sg = ethtool_op_set_sg,
822 .set_tso = ethtool_op_set_tso,
823 .set_ufo = ethtool_op_set_ufo,
824 .get_link = ethtool_op_get_link,
828 #define MAX_MTU 65535
830 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
832 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
838 static const struct net_device_ops virtnet_netdev = {
839 .ndo_open = virtnet_open,
840 .ndo_stop = virtnet_close,
841 .ndo_start_xmit = start_xmit,
842 .ndo_validate_addr = eth_validate_addr,
843 .ndo_set_mac_address = virtnet_set_mac_address,
844 .ndo_set_rx_mode = virtnet_set_rx_mode,
845 .ndo_change_mtu = virtnet_change_mtu,
846 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
847 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
848 #ifdef CONFIG_NET_POLL_CONTROLLER
849 .ndo_poll_controller = virtnet_netpoll,
853 static void virtnet_update_status(struct virtnet_info *vi)
857 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
860 vi->vdev->config->get(vi->vdev,
861 offsetof(struct virtio_net_config, status),
864 /* Ignore unknown (future) status bits */
865 v &= VIRTIO_NET_S_LINK_UP;
872 if (vi->status & VIRTIO_NET_S_LINK_UP) {
873 netif_carrier_on(vi->dev);
874 netif_wake_queue(vi->dev);
876 netif_carrier_off(vi->dev);
877 netif_stop_queue(vi->dev);
881 static void virtnet_config_changed(struct virtio_device *vdev)
883 struct virtnet_info *vi = vdev->priv;
885 virtnet_update_status(vi);
888 static int virtnet_probe(struct virtio_device *vdev)
891 struct net_device *dev;
892 struct virtnet_info *vi;
893 struct virtqueue *vqs[3];
894 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
895 const char *names[] = { "input", "output", "control" };
898 /* Allocate ourselves a network device with room for our info */
899 dev = alloc_etherdev(sizeof(struct virtnet_info));
903 /* Set up network device as normal. */
904 dev->netdev_ops = &virtnet_netdev;
905 dev->features = NETIF_F_HIGHDMA;
906 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
907 SET_NETDEV_DEV(dev, &vdev->dev);
909 /* Do we support "hardware" checksums? */
910 if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
911 /* This opens up the world of extra features. */
912 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
913 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
914 dev->features |= NETIF_F_TSO | NETIF_F_UFO
915 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
917 /* Individual feature bits: what can host handle? */
918 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
919 dev->features |= NETIF_F_TSO;
920 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
921 dev->features |= NETIF_F_TSO6;
922 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
923 dev->features |= NETIF_F_TSO_ECN;
924 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
925 dev->features |= NETIF_F_UFO;
928 /* Configuration may specify what MAC to use. Otherwise random. */
929 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
930 vdev->config->get(vdev,
931 offsetof(struct virtio_net_config, mac),
932 dev->dev_addr, dev->addr_len);
934 random_ether_addr(dev->dev_addr);
936 /* Set up our device-specific information */
937 vi = netdev_priv(dev);
938 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
943 INIT_DELAYED_WORK(&vi->refill, refill_work);
945 /* If we can receive ANY GSO packets, we must allocate large ones. */
946 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
947 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
948 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
949 vi->big_packets = true;
951 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
952 vi->mergeable_rx_bufs = true;
954 /* We expect two virtqueues, receive then send,
955 * and optionally control. */
956 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
958 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
965 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
968 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
969 dev->features |= NETIF_F_HW_VLAN_FILTER;
972 err = register_netdev(dev);
974 pr_debug("virtio_net: registering device failed\n");
978 /* Last of all, set up some receive buffers. */
979 try_fill_recv(vi, GFP_KERNEL);
981 /* If we didn't even get one input buffer, we're useless. */
987 vi->status = VIRTIO_NET_S_LINK_UP;
988 virtnet_update_status(vi);
989 netif_carrier_on(dev);
991 pr_debug("virtnet: registered device %s\n", dev->name);
995 unregister_netdev(dev);
996 cancel_delayed_work_sync(&vi->refill);
998 vdev->config->del_vqs(vdev);
1004 static void free_unused_bufs(struct virtnet_info *vi)
1008 buf = vi->svq->vq_ops->detach_unused_buf(vi->svq);
1014 buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq);
1017 if (vi->mergeable_rx_bufs || vi->big_packets)
1018 give_pages(vi, buf);
1023 BUG_ON(vi->num != 0);
1026 static void __devexit virtnet_remove(struct virtio_device *vdev)
1028 struct virtnet_info *vi = vdev->priv;
1030 /* Stop all the virtqueues. */
1031 vdev->config->reset(vdev);
1034 unregister_netdev(vi->dev);
1035 cancel_delayed_work_sync(&vi->refill);
1037 /* Free unused buffers in both send and recv, if any. */
1038 free_unused_bufs(vi);
1040 vdev->config->del_vqs(vi->vdev);
1043 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1045 free_netdev(vi->dev);
1048 static struct virtio_device_id id_table[] = {
1049 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1053 static unsigned int features[] = {
1054 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1055 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1056 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1057 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1058 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1059 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1060 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1063 static struct virtio_driver virtio_net_driver = {
1064 .feature_table = features,
1065 .feature_table_size = ARRAY_SIZE(features),
1066 .driver.name = KBUILD_MODNAME,
1067 .driver.owner = THIS_MODULE,
1068 .id_table = id_table,
1069 .probe = virtnet_probe,
1070 .remove = __devexit_p(virtnet_remove),
1071 .config_changed = virtnet_config_changed,
1074 static int __init init(void)
1076 return register_virtio_driver(&virtio_net_driver);
1079 static void __exit fini(void)
1081 unregister_virtio_driver(&virtio_net_driver);
1086 MODULE_DEVICE_TABLE(virtio, id_table);
1087 MODULE_DESCRIPTION("Virtio network driver");
1088 MODULE_LICENSE("GPL");