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 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 /* Work struct for refilling if we run low on memory. */
61 struct delayed_work refill;
63 /* Chain pages by the private ptr. */
69 struct virtio_net_hdr hdr;
70 struct virtio_net_hdr_mrg_rxbuf mhdr;
75 struct padded_vnet_hdr {
76 struct virtio_net_hdr hdr;
78 * virtio_net_hdr should be in a separated sg buffer because of a
79 * QEMU bug, and data sg buffer shares same page with this header sg.
80 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
85 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
87 return (struct skb_vnet_hdr *)skb->cb;
91 * private is used to chain pages for big packets, put the whole
92 * most recent used list in the beginning for reuse
94 static void give_pages(struct virtnet_info *vi, struct page *page)
98 /* Find end of list, sew whole thing into vi->pages. */
99 for (end = page; end->private; end = (struct page *)end->private);
100 end->private = (unsigned long)vi->pages;
104 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
106 struct page *p = vi->pages;
109 vi->pages = (struct page *)p->private;
110 /* clear private here, it is used to chain pages */
113 p = alloc_page(gfp_mask);
117 static void skb_xmit_done(struct virtqueue *svq)
119 struct virtnet_info *vi = svq->vdev->priv;
121 /* Suppress further interrupts. */
122 svq->vq_ops->disable_cb(svq);
124 /* We were probably waiting for more output buffers. */
125 netif_wake_queue(vi->dev);
128 static void set_skb_frag(struct sk_buff *skb, struct page *page,
129 unsigned int offset, unsigned int *len)
131 int i = skb_shinfo(skb)->nr_frags;
134 f = &skb_shinfo(skb)->frags[i];
135 f->size = min((unsigned)PAGE_SIZE - offset, *len);
136 f->page_offset = offset;
139 skb->data_len += f->size;
141 skb_shinfo(skb)->nr_frags++;
145 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
146 struct page *page, unsigned int len)
149 struct skb_vnet_hdr *hdr;
150 unsigned int copy, hdr_len, offset;
153 p = page_address(page);
155 /* copy small packet so we can reuse these pages for small data */
156 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
160 hdr = skb_vnet_hdr(skb);
162 if (vi->mergeable_rx_bufs) {
163 hdr_len = sizeof hdr->mhdr;
166 hdr_len = sizeof hdr->hdr;
167 offset = sizeof(struct padded_vnet_hdr);
170 memcpy(hdr, p, hdr_len);
176 if (copy > skb_tailroom(skb))
177 copy = skb_tailroom(skb);
178 memcpy(skb_put(skb, copy), p, copy);
184 set_skb_frag(skb, page, offset, &len);
185 page = (struct page *)page->private;
190 give_pages(vi, page);
195 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
197 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
201 num_buf = hdr->mhdr.num_buffers;
203 i = skb_shinfo(skb)->nr_frags;
204 if (i >= MAX_SKB_FRAGS) {
205 pr_debug("%s: packet too long\n", skb->dev->name);
206 skb->dev->stats.rx_length_errors++;
210 page = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
212 pr_debug("%s: rx error: %d buffers missing\n",
213 skb->dev->name, hdr->mhdr.num_buffers);
214 skb->dev->stats.rx_length_errors++;
220 set_skb_frag(skb, page, 0, &len);
227 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
229 struct virtnet_info *vi = netdev_priv(dev);
232 struct skb_vnet_hdr *hdr;
234 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
235 pr_debug("%s: short packet %i\n", dev->name, len);
236 dev->stats.rx_length_errors++;
237 if (vi->mergeable_rx_bufs || vi->big_packets)
244 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
246 len -= sizeof(struct virtio_net_hdr);
250 skb = page_to_skb(vi, page, len);
251 if (unlikely(!skb)) {
252 dev->stats.rx_dropped++;
253 give_pages(vi, page);
256 if (vi->mergeable_rx_bufs)
257 if (receive_mergeable(vi, skb)) {
263 hdr = skb_vnet_hdr(skb);
264 skb->truesize += skb->data_len;
265 dev->stats.rx_bytes += skb->len;
266 dev->stats.rx_packets++;
268 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
269 pr_debug("Needs csum!\n");
270 if (!skb_partial_csum_set(skb,
272 hdr->hdr.csum_offset))
276 skb->protocol = eth_type_trans(skb, dev);
277 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
278 ntohs(skb->protocol), skb->len, skb->pkt_type);
280 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
282 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
283 case VIRTIO_NET_HDR_GSO_TCPV4:
284 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
286 case VIRTIO_NET_HDR_GSO_UDP:
287 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
289 case VIRTIO_NET_HDR_GSO_TCPV6:
290 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
294 printk(KERN_WARNING "%s: bad gso type %u.\n",
295 dev->name, hdr->hdr.gso_type);
299 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
300 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
302 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
303 if (skb_shinfo(skb)->gso_size == 0) {
305 printk(KERN_WARNING "%s: zero gso size.\n",
310 /* Header must be checked, and gso_segs computed. */
311 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
312 skb_shinfo(skb)->gso_segs = 0;
315 netif_receive_skb(skb);
319 dev->stats.rx_frame_errors++;
323 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
326 struct skb_vnet_hdr *hdr;
327 struct scatterlist 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 /* page in sg[MAX_SKB_FRAGS + 1] is list tail */
356 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
357 first = get_a_page(vi, gfp);
360 give_pages(vi, list);
363 sg_set_buf(&sg[i], page_address(first), PAGE_SIZE);
365 /* chain new page in list head to match sg */
366 first->private = (unsigned long)list;
370 first = get_a_page(vi, gfp);
372 give_pages(vi, list);
375 p = page_address(first);
377 /* sg[0], sg[1] share the same page */
378 /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/
379 sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr));
381 /* sg[1] for data packet, from offset */
382 offset = sizeof(struct padded_vnet_hdr);
383 sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset);
385 /* chain first in list head */
386 first->private = (unsigned long)list;
387 err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2,
390 give_pages(vi, first);
395 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
398 struct scatterlist sg;
401 page = get_a_page(vi, gfp);
405 sg_init_one(&sg, page_address(page), PAGE_SIZE);
407 err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page);
409 give_pages(vi, page);
414 /* Returns false if we couldn't fill entirely (OOM). */
415 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
421 if (vi->mergeable_rx_bufs)
422 err = add_recvbuf_mergeable(vi, gfp);
423 else if (vi->big_packets)
424 err = add_recvbuf_big(vi, gfp);
426 err = add_recvbuf_small(vi, gfp);
434 if (unlikely(vi->num > vi->max))
436 vi->rvq->vq_ops->kick(vi->rvq);
440 static void skb_recv_done(struct virtqueue *rvq)
442 struct virtnet_info *vi = rvq->vdev->priv;
443 /* Schedule NAPI, Suppress further interrupts if successful. */
444 if (napi_schedule_prep(&vi->napi)) {
445 rvq->vq_ops->disable_cb(rvq);
446 __napi_schedule(&vi->napi);
450 static void refill_work(struct work_struct *work)
452 struct virtnet_info *vi;
455 vi = container_of(work, struct virtnet_info, refill.work);
456 napi_disable(&vi->napi);
457 still_empty = !try_fill_recv(vi, GFP_KERNEL);
458 napi_enable(&vi->napi);
460 /* In theory, this can happen: if we don't get any buffers in
461 * we will *never* try to fill again. */
463 schedule_delayed_work(&vi->refill, HZ/2);
466 static int virtnet_poll(struct napi_struct *napi, int budget)
468 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
470 unsigned int len, received = 0;
473 while (received < budget &&
474 (buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
475 receive_buf(vi->dev, buf, len);
480 if (vi->num < vi->max / 2) {
481 if (!try_fill_recv(vi, GFP_ATOMIC))
482 schedule_delayed_work(&vi->refill, 0);
485 /* Out of packets? */
486 if (received < budget) {
488 if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) &&
489 napi_schedule_prep(napi)) {
490 vi->rvq->vq_ops->disable_cb(vi->rvq);
491 __napi_schedule(napi);
499 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
502 unsigned int len, tot_sgs = 0;
504 while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
505 pr_debug("Sent skb %p\n", skb);
506 vi->dev->stats.tx_bytes += skb->len;
507 vi->dev->stats.tx_packets++;
508 tot_sgs += skb_vnet_hdr(skb)->num_sg;
509 dev_kfree_skb_any(skb);
514 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
516 struct scatterlist sg[2+MAX_SKB_FRAGS];
517 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
518 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
520 sg_init_table(sg, 2+MAX_SKB_FRAGS);
522 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
524 if (skb->ip_summed == CHECKSUM_PARTIAL) {
525 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
526 hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
527 hdr->hdr.csum_offset = skb->csum_offset;
530 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
533 if (skb_is_gso(skb)) {
534 hdr->hdr.hdr_len = skb_headlen(skb);
535 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
536 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
537 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
538 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
539 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
540 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
541 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
544 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
545 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
547 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
548 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
551 hdr->mhdr.num_buffers = 0;
553 /* Encode metadata header at front. */
554 if (vi->mergeable_rx_bufs)
555 sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr);
557 sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
559 hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
560 return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
563 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
565 struct virtnet_info *vi = netdev_priv(dev);
569 /* Free up any pending old buffers before queueing new ones. */
570 free_old_xmit_skbs(vi);
572 /* Try to transmit */
573 capacity = xmit_skb(vi, skb);
575 /* This can happen with OOM and indirect buffers. */
576 if (unlikely(capacity < 0)) {
577 netif_stop_queue(dev);
578 dev_warn(&dev->dev, "Unexpected full queue\n");
579 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
580 vi->svq->vq_ops->disable_cb(vi->svq);
581 netif_start_queue(dev);
584 return NETDEV_TX_BUSY;
586 vi->svq->vq_ops->kick(vi->svq);
588 /* Don't wait up for transmitted skbs to be freed. */
592 /* Apparently nice girls don't return TX_BUSY; stop the queue
593 * before it gets out of hand. Naturally, this wastes entries. */
594 if (capacity < 2+MAX_SKB_FRAGS) {
595 netif_stop_queue(dev);
596 if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
597 /* More just got used, free them then recheck. */
598 capacity += free_old_xmit_skbs(vi);
599 if (capacity >= 2+MAX_SKB_FRAGS) {
600 netif_start_queue(dev);
601 vi->svq->vq_ops->disable_cb(vi->svq);
609 static int virtnet_set_mac_address(struct net_device *dev, void *p)
611 struct virtnet_info *vi = netdev_priv(dev);
612 struct virtio_device *vdev = vi->vdev;
615 ret = eth_mac_addr(dev, p);
619 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
620 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
621 dev->dev_addr, dev->addr_len);
626 #ifdef CONFIG_NET_POLL_CONTROLLER
627 static void virtnet_netpoll(struct net_device *dev)
629 struct virtnet_info *vi = netdev_priv(dev);
631 napi_schedule(&vi->napi);
635 static int virtnet_open(struct net_device *dev)
637 struct virtnet_info *vi = netdev_priv(dev);
639 napi_enable(&vi->napi);
641 /* If all buffers were filled by other side before we napi_enabled, we
642 * won't get another interrupt, so process any outstanding packets
643 * now. virtnet_poll wants re-enable the queue, so we disable here.
644 * We synchronize against interrupts via NAPI_STATE_SCHED */
645 if (napi_schedule_prep(&vi->napi)) {
646 vi->rvq->vq_ops->disable_cb(vi->rvq);
647 __napi_schedule(&vi->napi);
653 * Send command via the control virtqueue and check status. Commands
654 * supported by the hypervisor, as indicated by feature bits, should
655 * never fail unless improperly formated.
657 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
658 struct scatterlist *data, int out, int in)
660 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
661 struct virtio_net_ctrl_hdr ctrl;
662 virtio_net_ctrl_ack status = ~0;
666 /* Caller should know better */
667 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
668 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
670 out++; /* Add header */
671 in++; /* Add return status */
676 sg_init_table(sg, out + in);
678 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
679 for_each_sg(data, s, out + in - 2, i)
680 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
681 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
683 BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
685 vi->cvq->vq_ops->kick(vi->cvq);
688 * Spin for a response, the kick causes an ioport write, trapping
689 * into the hypervisor, so the request should be handled immediately.
691 while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp))
694 return status == VIRTIO_NET_OK;
697 static int virtnet_close(struct net_device *dev)
699 struct virtnet_info *vi = netdev_priv(dev);
701 napi_disable(&vi->napi);
706 static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
708 struct virtnet_info *vi = netdev_priv(dev);
709 struct virtio_device *vdev = vi->vdev;
711 if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
714 return ethtool_op_set_tx_hw_csum(dev, data);
717 static void virtnet_set_rx_mode(struct net_device *dev)
719 struct virtnet_info *vi = netdev_priv(dev);
720 struct scatterlist sg[2];
721 u8 promisc, allmulti;
722 struct virtio_net_ctrl_mac *mac_data;
723 struct dev_addr_list *addr;
724 struct netdev_hw_addr *ha;
730 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
731 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
734 promisc = ((dev->flags & IFF_PROMISC) != 0);
735 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
737 sg_init_one(sg, &promisc, sizeof(promisc));
739 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
740 VIRTIO_NET_CTRL_RX_PROMISC,
742 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
743 promisc ? "en" : "dis");
745 sg_init_one(sg, &allmulti, sizeof(allmulti));
747 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
748 VIRTIO_NET_CTRL_RX_ALLMULTI,
750 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
751 allmulti ? "en" : "dis");
753 uc_count = netdev_uc_count(dev);
754 mc_count = netdev_mc_count(dev);
755 /* MAC filter - use one buffer for both lists */
756 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
757 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
760 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
764 sg_init_table(sg, 2);
766 /* Store the unicast list and count in the front of the buffer */
767 mac_data->entries = uc_count;
769 netdev_for_each_uc_addr(ha, dev)
770 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
772 sg_set_buf(&sg[0], mac_data,
773 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
775 /* multicast list and count fill the end */
776 mac_data = (void *)&mac_data->macs[uc_count][0];
778 mac_data->entries = mc_count;
780 netdev_for_each_mc_addr(addr, dev)
781 memcpy(&mac_data->macs[i++][0], addr->da_addr, ETH_ALEN);
783 sg_set_buf(&sg[1], mac_data,
784 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
786 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
787 VIRTIO_NET_CTRL_MAC_TABLE_SET,
789 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
794 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
796 struct virtnet_info *vi = netdev_priv(dev);
797 struct scatterlist sg;
799 sg_init_one(&sg, &vid, sizeof(vid));
801 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
802 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
803 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
806 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
808 struct virtnet_info *vi = netdev_priv(dev);
809 struct scatterlist sg;
811 sg_init_one(&sg, &vid, sizeof(vid));
813 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
814 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
815 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
818 static const struct ethtool_ops virtnet_ethtool_ops = {
819 .set_tx_csum = virtnet_set_tx_csum,
820 .set_sg = ethtool_op_set_sg,
821 .set_tso = ethtool_op_set_tso,
822 .set_ufo = ethtool_op_set_ufo,
823 .get_link = ethtool_op_get_link,
827 #define MAX_MTU 65535
829 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
831 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
837 static const struct net_device_ops virtnet_netdev = {
838 .ndo_open = virtnet_open,
839 .ndo_stop = virtnet_close,
840 .ndo_start_xmit = start_xmit,
841 .ndo_validate_addr = eth_validate_addr,
842 .ndo_set_mac_address = virtnet_set_mac_address,
843 .ndo_set_rx_mode = virtnet_set_rx_mode,
844 .ndo_change_mtu = virtnet_change_mtu,
845 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
846 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
847 #ifdef CONFIG_NET_POLL_CONTROLLER
848 .ndo_poll_controller = virtnet_netpoll,
852 static void virtnet_update_status(struct virtnet_info *vi)
856 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
859 vi->vdev->config->get(vi->vdev,
860 offsetof(struct virtio_net_config, status),
863 /* Ignore unknown (future) status bits */
864 v &= VIRTIO_NET_S_LINK_UP;
871 if (vi->status & VIRTIO_NET_S_LINK_UP) {
872 netif_carrier_on(vi->dev);
873 netif_wake_queue(vi->dev);
875 netif_carrier_off(vi->dev);
876 netif_stop_queue(vi->dev);
880 static void virtnet_config_changed(struct virtio_device *vdev)
882 struct virtnet_info *vi = vdev->priv;
884 virtnet_update_status(vi);
887 static int virtnet_probe(struct virtio_device *vdev)
890 struct net_device *dev;
891 struct virtnet_info *vi;
892 struct virtqueue *vqs[3];
893 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
894 const char *names[] = { "input", "output", "control" };
897 /* Allocate ourselves a network device with room for our info */
898 dev = alloc_etherdev(sizeof(struct virtnet_info));
902 /* Set up network device as normal. */
903 dev->netdev_ops = &virtnet_netdev;
904 dev->features = NETIF_F_HIGHDMA;
905 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
906 SET_NETDEV_DEV(dev, &vdev->dev);
908 /* Do we support "hardware" checksums? */
909 if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
910 /* This opens up the world of extra features. */
911 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
912 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
913 dev->features |= NETIF_F_TSO | NETIF_F_UFO
914 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
916 /* Individual feature bits: what can host handle? */
917 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
918 dev->features |= NETIF_F_TSO;
919 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
920 dev->features |= NETIF_F_TSO6;
921 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
922 dev->features |= NETIF_F_TSO_ECN;
923 if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
924 dev->features |= NETIF_F_UFO;
927 /* Configuration may specify what MAC to use. Otherwise random. */
928 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
929 vdev->config->get(vdev,
930 offsetof(struct virtio_net_config, mac),
931 dev->dev_addr, dev->addr_len);
933 random_ether_addr(dev->dev_addr);
935 /* Set up our device-specific information */
936 vi = netdev_priv(dev);
937 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
942 INIT_DELAYED_WORK(&vi->refill, refill_work);
944 /* If we can receive ANY GSO packets, we must allocate large ones. */
945 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
946 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
947 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
948 vi->big_packets = true;
950 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
951 vi->mergeable_rx_bufs = true;
953 /* We expect two virtqueues, receive then send,
954 * and optionally control. */
955 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
957 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
964 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
967 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
968 dev->features |= NETIF_F_HW_VLAN_FILTER;
971 err = register_netdev(dev);
973 pr_debug("virtio_net: registering device failed\n");
977 /* Last of all, set up some receive buffers. */
978 try_fill_recv(vi, GFP_KERNEL);
980 /* If we didn't even get one input buffer, we're useless. */
986 vi->status = VIRTIO_NET_S_LINK_UP;
987 virtnet_update_status(vi);
988 netif_carrier_on(dev);
990 pr_debug("virtnet: registered device %s\n", dev->name);
994 unregister_netdev(dev);
995 cancel_delayed_work_sync(&vi->refill);
997 vdev->config->del_vqs(vdev);
1003 static void free_unused_bufs(struct virtnet_info *vi)
1007 buf = vi->svq->vq_ops->detach_unused_buf(vi->svq);
1013 buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq);
1016 if (vi->mergeable_rx_bufs || vi->big_packets)
1017 give_pages(vi, buf);
1022 BUG_ON(vi->num != 0);
1025 static void __devexit virtnet_remove(struct virtio_device *vdev)
1027 struct virtnet_info *vi = vdev->priv;
1029 /* Stop all the virtqueues. */
1030 vdev->config->reset(vdev);
1033 unregister_netdev(vi->dev);
1034 cancel_delayed_work_sync(&vi->refill);
1036 /* Free unused buffers in both send and recv, if any. */
1037 free_unused_bufs(vi);
1039 vdev->config->del_vqs(vi->vdev);
1042 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1044 free_netdev(vi->dev);
1047 static struct virtio_device_id id_table[] = {
1048 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1052 static unsigned int features[] = {
1053 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1054 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1055 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1056 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1057 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1058 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1059 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1062 static struct virtio_driver virtio_net_driver = {
1063 .feature_table = features,
1064 .feature_table_size = ARRAY_SIZE(features),
1065 .driver.name = KBUILD_MODNAME,
1066 .driver.owner = THIS_MODULE,
1067 .id_table = id_table,
1068 .probe = virtnet_probe,
1069 .remove = __devexit_p(virtnet_remove),
1070 .config_changed = virtnet_config_changed,
1073 static int __init init(void)
1075 return register_virtio_driver(&virtio_net_driver);
1078 static void __exit fini(void)
1080 unregister_virtio_driver(&virtio_net_driver);
1085 MODULE_DEVICE_TABLE(virtio, id_table);
1086 MODULE_DESCRIPTION("Virtio network driver");
1087 MODULE_LICENSE("GPL");