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
43 struct virtnet_stats {
44 struct u64_stats_sync syncp;
53 struct virtio_device *vdev;
54 struct virtqueue *rvq, *svq, *cvq;
55 struct net_device *dev;
56 struct napi_struct napi;
59 /* Number of input buffers, and max we've ever had. */
60 unsigned int num, max;
62 /* I like... big packets and I cannot lie! */
65 /* Host will merge rx buffers for big packets (shake it! shake it!) */
66 bool mergeable_rx_bufs;
68 /* Active statistics */
69 struct virtnet_stats __percpu *stats;
71 /* Work struct for refilling if we run low on memory. */
72 struct delayed_work refill;
74 /* Chain pages by the private ptr. */
77 /* fragments + linear part + virtio header */
78 struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
79 struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
84 struct virtio_net_hdr hdr;
85 struct virtio_net_hdr_mrg_rxbuf mhdr;
90 struct padded_vnet_hdr {
91 struct virtio_net_hdr hdr;
93 * virtio_net_hdr should be in a separated sg buffer because of a
94 * QEMU bug, and data sg buffer shares same page with this header sg.
95 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
100 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
102 return (struct skb_vnet_hdr *)skb->cb;
106 * private is used to chain pages for big packets, put the whole
107 * most recent used list in the beginning for reuse
109 static void give_pages(struct virtnet_info *vi, struct page *page)
113 /* Find end of list, sew whole thing into vi->pages. */
114 for (end = page; end->private; end = (struct page *)end->private);
115 end->private = (unsigned long)vi->pages;
119 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
121 struct page *p = vi->pages;
124 vi->pages = (struct page *)p->private;
125 /* clear private here, it is used to chain pages */
128 p = alloc_page(gfp_mask);
132 static void skb_xmit_done(struct virtqueue *svq)
134 struct virtnet_info *vi = svq->vdev->priv;
136 /* Suppress further interrupts. */
137 virtqueue_disable_cb(svq);
139 /* We were probably waiting for more output buffers. */
140 netif_wake_queue(vi->dev);
143 static void set_skb_frag(struct sk_buff *skb, struct page *page,
144 unsigned int offset, unsigned int *len)
146 int i = skb_shinfo(skb)->nr_frags;
149 f = &skb_shinfo(skb)->frags[i];
150 f->size = min((unsigned)PAGE_SIZE - offset, *len);
151 f->page_offset = offset;
152 __skb_frag_set_page(f, page);
154 skb->data_len += f->size;
156 skb_shinfo(skb)->nr_frags++;
160 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
161 struct page *page, unsigned int len)
164 struct skb_vnet_hdr *hdr;
165 unsigned int copy, hdr_len, offset;
168 p = page_address(page);
170 /* copy small packet so we can reuse these pages for small data */
171 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
175 hdr = skb_vnet_hdr(skb);
177 if (vi->mergeable_rx_bufs) {
178 hdr_len = sizeof hdr->mhdr;
181 hdr_len = sizeof hdr->hdr;
182 offset = sizeof(struct padded_vnet_hdr);
185 memcpy(hdr, p, hdr_len);
191 if (copy > skb_tailroom(skb))
192 copy = skb_tailroom(skb);
193 memcpy(skb_put(skb, copy), p, copy);
199 * Verify that we can indeed put this data into a skb.
200 * This is here to handle cases when the device erroneously
201 * tries to receive more than is possible. This is usually
202 * the case of a broken device.
204 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
206 pr_debug("%s: too much data\n", skb->dev->name);
212 set_skb_frag(skb, page, offset, &len);
213 page = (struct page *)page->private;
218 give_pages(vi, page);
223 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
225 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
229 num_buf = hdr->mhdr.num_buffers;
231 i = skb_shinfo(skb)->nr_frags;
232 if (i >= MAX_SKB_FRAGS) {
233 pr_debug("%s: packet too long\n", skb->dev->name);
234 skb->dev->stats.rx_length_errors++;
237 page = virtqueue_get_buf(vi->rvq, &len);
239 pr_debug("%s: rx error: %d buffers missing\n",
240 skb->dev->name, hdr->mhdr.num_buffers);
241 skb->dev->stats.rx_length_errors++;
248 set_skb_frag(skb, page, 0, &len);
255 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
257 struct virtnet_info *vi = netdev_priv(dev);
258 struct virtnet_stats __percpu *stats = this_cpu_ptr(vi->stats);
261 struct skb_vnet_hdr *hdr;
263 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
264 pr_debug("%s: short packet %i\n", dev->name, len);
265 dev->stats.rx_length_errors++;
266 if (vi->mergeable_rx_bufs || vi->big_packets)
273 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
275 len -= sizeof(struct virtio_net_hdr);
279 skb = page_to_skb(vi, page, len);
280 if (unlikely(!skb)) {
281 dev->stats.rx_dropped++;
282 give_pages(vi, page);
285 if (vi->mergeable_rx_bufs)
286 if (receive_mergeable(vi, skb)) {
292 hdr = skb_vnet_hdr(skb);
293 skb->truesize += skb->data_len;
295 u64_stats_update_begin(&stats->syncp);
296 stats->rx_bytes += skb->len;
298 u64_stats_update_end(&stats->syncp);
300 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
301 pr_debug("Needs csum!\n");
302 if (!skb_partial_csum_set(skb,
304 hdr->hdr.csum_offset))
306 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
307 skb->ip_summed = CHECKSUM_UNNECESSARY;
310 skb->protocol = eth_type_trans(skb, dev);
311 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
312 ntohs(skb->protocol), skb->len, skb->pkt_type);
314 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
316 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
317 case VIRTIO_NET_HDR_GSO_TCPV4:
318 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
320 case VIRTIO_NET_HDR_GSO_UDP:
321 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
323 case VIRTIO_NET_HDR_GSO_TCPV6:
324 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
328 printk(KERN_WARNING "%s: bad gso type %u.\n",
329 dev->name, hdr->hdr.gso_type);
333 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
334 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
336 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
337 if (skb_shinfo(skb)->gso_size == 0) {
339 printk(KERN_WARNING "%s: zero gso size.\n",
344 /* Header must be checked, and gso_segs computed. */
345 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
346 skb_shinfo(skb)->gso_segs = 0;
349 netif_receive_skb(skb);
353 dev->stats.rx_frame_errors++;
357 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
360 struct skb_vnet_hdr *hdr;
363 skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
367 skb_put(skb, MAX_PACKET_LEN);
369 hdr = skb_vnet_hdr(skb);
370 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
372 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
374 err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
381 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
383 struct page *first, *list = NULL;
387 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
388 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
389 first = get_a_page(vi, gfp);
392 give_pages(vi, list);
395 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
397 /* chain new page in list head to match sg */
398 first->private = (unsigned long)list;
402 first = get_a_page(vi, gfp);
404 give_pages(vi, list);
407 p = page_address(first);
409 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
410 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
411 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
413 /* vi->rx_sg[1] for data packet, from offset */
414 offset = sizeof(struct padded_vnet_hdr);
415 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
417 /* chain first in list head */
418 first->private = (unsigned long)list;
419 err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
422 give_pages(vi, first);
427 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
432 page = get_a_page(vi, gfp);
436 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
438 err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
440 give_pages(vi, page);
445 /* Returns false if we couldn't fill entirely (OOM). */
446 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
452 if (vi->mergeable_rx_bufs)
453 err = add_recvbuf_mergeable(vi, gfp);
454 else if (vi->big_packets)
455 err = add_recvbuf_big(vi, gfp);
457 err = add_recvbuf_small(vi, gfp);
459 oom = err == -ENOMEM;
464 if (unlikely(vi->num > vi->max))
466 virtqueue_kick(vi->rvq);
470 static void skb_recv_done(struct virtqueue *rvq)
472 struct virtnet_info *vi = rvq->vdev->priv;
473 /* Schedule NAPI, Suppress further interrupts if successful. */
474 if (napi_schedule_prep(&vi->napi)) {
475 virtqueue_disable_cb(rvq);
476 __napi_schedule(&vi->napi);
480 static void virtnet_napi_enable(struct virtnet_info *vi)
482 napi_enable(&vi->napi);
484 /* If all buffers were filled by other side before we napi_enabled, we
485 * won't get another interrupt, so process any outstanding packets
486 * now. virtnet_poll wants re-enable the queue, so we disable here.
487 * We synchronize against interrupts via NAPI_STATE_SCHED */
488 if (napi_schedule_prep(&vi->napi)) {
489 virtqueue_disable_cb(vi->rvq);
490 __napi_schedule(&vi->napi);
494 static void refill_work(struct work_struct *work)
496 struct virtnet_info *vi;
499 vi = container_of(work, struct virtnet_info, refill.work);
500 napi_disable(&vi->napi);
501 still_empty = !try_fill_recv(vi, GFP_KERNEL);
502 virtnet_napi_enable(vi);
504 /* In theory, this can happen: if we don't get any buffers in
505 * we will *never* try to fill again. */
507 schedule_delayed_work(&vi->refill, HZ/2);
510 static int virtnet_poll(struct napi_struct *napi, int budget)
512 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
514 unsigned int len, received = 0;
517 while (received < budget &&
518 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
519 receive_buf(vi->dev, buf, len);
524 if (vi->num < vi->max / 2) {
525 if (!try_fill_recv(vi, GFP_ATOMIC))
526 schedule_delayed_work(&vi->refill, 0);
529 /* Out of packets? */
530 if (received < budget) {
532 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
533 napi_schedule_prep(napi)) {
534 virtqueue_disable_cb(vi->rvq);
535 __napi_schedule(napi);
543 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
546 unsigned int len, tot_sgs = 0;
547 struct virtnet_stats __percpu *stats = this_cpu_ptr(vi->stats);
549 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
550 pr_debug("Sent skb %p\n", skb);
552 u64_stats_update_begin(&stats->syncp);
553 stats->tx_bytes += skb->len;
555 u64_stats_update_end(&stats->syncp);
557 tot_sgs += skb_vnet_hdr(skb)->num_sg;
558 dev_kfree_skb_any(skb);
563 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
565 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
566 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
568 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
570 if (skb->ip_summed == CHECKSUM_PARTIAL) {
571 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
572 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
573 hdr->hdr.csum_offset = skb->csum_offset;
576 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
579 if (skb_is_gso(skb)) {
580 hdr->hdr.hdr_len = skb_headlen(skb);
581 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
582 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
583 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
584 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
585 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
586 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
587 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
590 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
591 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
593 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
594 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
597 hdr->mhdr.num_buffers = 0;
599 /* Encode metadata header at front. */
600 if (vi->mergeable_rx_bufs)
601 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
603 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
605 hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
606 return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
610 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
612 struct virtnet_info *vi = netdev_priv(dev);
615 /* Free up any pending old buffers before queueing new ones. */
616 free_old_xmit_skbs(vi);
618 /* Try to transmit */
619 capacity = xmit_skb(vi, skb);
621 /* This can happen with OOM and indirect buffers. */
622 if (unlikely(capacity < 0)) {
623 if (net_ratelimit()) {
624 if (likely(capacity == -ENOMEM)) {
626 "TX queue failure: out of memory\n");
628 dev->stats.tx_fifo_errors++;
630 "Unexpected TX queue failure: %d\n",
634 dev->stats.tx_dropped++;
638 virtqueue_kick(vi->svq);
640 /* Don't wait up for transmitted skbs to be freed. */
644 /* Apparently nice girls don't return TX_BUSY; stop the queue
645 * before it gets out of hand. Naturally, this wastes entries. */
646 if (capacity < 2+MAX_SKB_FRAGS) {
647 netif_stop_queue(dev);
648 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
649 /* More just got used, free them then recheck. */
650 capacity += free_old_xmit_skbs(vi);
651 if (capacity >= 2+MAX_SKB_FRAGS) {
652 netif_start_queue(dev);
653 virtqueue_disable_cb(vi->svq);
661 static int virtnet_set_mac_address(struct net_device *dev, void *p)
663 struct virtnet_info *vi = netdev_priv(dev);
664 struct virtio_device *vdev = vi->vdev;
667 ret = eth_mac_addr(dev, p);
671 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
672 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
673 dev->dev_addr, dev->addr_len);
678 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
679 struct rtnl_link_stats64 *tot)
681 struct virtnet_info *vi = netdev_priv(dev);
685 for_each_possible_cpu(cpu) {
686 struct virtnet_stats __percpu *stats
687 = per_cpu_ptr(vi->stats, cpu);
688 u64 tpackets, tbytes, rpackets, rbytes;
691 start = u64_stats_fetch_begin(&stats->syncp);
692 tpackets = stats->tx_packets;
693 tbytes = stats->tx_bytes;
694 rpackets = stats->rx_packets;
695 rbytes = stats->rx_bytes;
696 } while (u64_stats_fetch_retry(&stats->syncp, start));
698 tot->rx_packets += rpackets;
699 tot->tx_packets += tpackets;
700 tot->rx_bytes += rbytes;
701 tot->tx_bytes += tbytes;
704 tot->tx_dropped = dev->stats.tx_dropped;
705 tot->rx_dropped = dev->stats.rx_dropped;
706 tot->rx_length_errors = dev->stats.rx_length_errors;
707 tot->rx_frame_errors = dev->stats.rx_frame_errors;
712 #ifdef CONFIG_NET_POLL_CONTROLLER
713 static void virtnet_netpoll(struct net_device *dev)
715 struct virtnet_info *vi = netdev_priv(dev);
717 napi_schedule(&vi->napi);
721 static int virtnet_open(struct net_device *dev)
723 struct virtnet_info *vi = netdev_priv(dev);
725 virtnet_napi_enable(vi);
730 * Send command via the control virtqueue and check status. Commands
731 * supported by the hypervisor, as indicated by feature bits, should
732 * never fail unless improperly formated.
734 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
735 struct scatterlist *data, int out, int in)
737 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
738 struct virtio_net_ctrl_hdr ctrl;
739 virtio_net_ctrl_ack status = ~0;
743 /* Caller should know better */
744 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
745 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
747 out++; /* Add header */
748 in++; /* Add return status */
753 sg_init_table(sg, out + in);
755 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
756 for_each_sg(data, s, out + in - 2, i)
757 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
758 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
760 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi) < 0);
762 virtqueue_kick(vi->cvq);
765 * Spin for a response, the kick causes an ioport write, trapping
766 * into the hypervisor, so the request should be handled immediately.
768 while (!virtqueue_get_buf(vi->cvq, &tmp))
771 return status == VIRTIO_NET_OK;
774 static int virtnet_close(struct net_device *dev)
776 struct virtnet_info *vi = netdev_priv(dev);
778 napi_disable(&vi->napi);
783 static void virtnet_set_rx_mode(struct net_device *dev)
785 struct virtnet_info *vi = netdev_priv(dev);
786 struct scatterlist sg[2];
787 u8 promisc, allmulti;
788 struct virtio_net_ctrl_mac *mac_data;
789 struct netdev_hw_addr *ha;
795 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
796 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
799 promisc = ((dev->flags & IFF_PROMISC) != 0);
800 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
802 sg_init_one(sg, &promisc, sizeof(promisc));
804 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
805 VIRTIO_NET_CTRL_RX_PROMISC,
807 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
808 promisc ? "en" : "dis");
810 sg_init_one(sg, &allmulti, sizeof(allmulti));
812 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
813 VIRTIO_NET_CTRL_RX_ALLMULTI,
815 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
816 allmulti ? "en" : "dis");
818 uc_count = netdev_uc_count(dev);
819 mc_count = netdev_mc_count(dev);
820 /* MAC filter - use one buffer for both lists */
821 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
822 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
825 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
829 sg_init_table(sg, 2);
831 /* Store the unicast list and count in the front of the buffer */
832 mac_data->entries = uc_count;
834 netdev_for_each_uc_addr(ha, dev)
835 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
837 sg_set_buf(&sg[0], mac_data,
838 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
840 /* multicast list and count fill the end */
841 mac_data = (void *)&mac_data->macs[uc_count][0];
843 mac_data->entries = mc_count;
845 netdev_for_each_mc_addr(ha, dev)
846 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
848 sg_set_buf(&sg[1], mac_data,
849 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
851 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
852 VIRTIO_NET_CTRL_MAC_TABLE_SET,
854 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
859 static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
861 struct virtnet_info *vi = netdev_priv(dev);
862 struct scatterlist sg;
864 sg_init_one(&sg, &vid, sizeof(vid));
866 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
867 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
868 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
871 static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
873 struct virtnet_info *vi = netdev_priv(dev);
874 struct scatterlist sg;
876 sg_init_one(&sg, &vid, sizeof(vid));
878 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
879 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
880 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
883 static const struct ethtool_ops virtnet_ethtool_ops = {
884 .get_link = ethtool_op_get_link,
888 #define MAX_MTU 65535
890 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
892 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
898 static const struct net_device_ops virtnet_netdev = {
899 .ndo_open = virtnet_open,
900 .ndo_stop = virtnet_close,
901 .ndo_start_xmit = start_xmit,
902 .ndo_validate_addr = eth_validate_addr,
903 .ndo_set_mac_address = virtnet_set_mac_address,
904 .ndo_set_rx_mode = virtnet_set_rx_mode,
905 .ndo_change_mtu = virtnet_change_mtu,
906 .ndo_get_stats64 = virtnet_stats,
907 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
908 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
909 #ifdef CONFIG_NET_POLL_CONTROLLER
910 .ndo_poll_controller = virtnet_netpoll,
914 static void virtnet_update_status(struct virtnet_info *vi)
918 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS))
921 vi->vdev->config->get(vi->vdev,
922 offsetof(struct virtio_net_config, status),
925 /* Ignore unknown (future) status bits */
926 v &= VIRTIO_NET_S_LINK_UP;
933 if (vi->status & VIRTIO_NET_S_LINK_UP) {
934 netif_carrier_on(vi->dev);
935 netif_wake_queue(vi->dev);
937 netif_carrier_off(vi->dev);
938 netif_stop_queue(vi->dev);
942 static void virtnet_config_changed(struct virtio_device *vdev)
944 struct virtnet_info *vi = vdev->priv;
946 virtnet_update_status(vi);
949 static int virtnet_probe(struct virtio_device *vdev)
952 struct net_device *dev;
953 struct virtnet_info *vi;
954 struct virtqueue *vqs[3];
955 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
956 const char *names[] = { "input", "output", "control" };
959 /* Allocate ourselves a network device with room for our info */
960 dev = alloc_etherdev(sizeof(struct virtnet_info));
964 /* Set up network device as normal. */
965 dev->priv_flags |= IFF_UNICAST_FLT;
966 dev->netdev_ops = &virtnet_netdev;
967 dev->features = NETIF_F_HIGHDMA;
969 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
970 SET_NETDEV_DEV(dev, &vdev->dev);
972 /* Do we support "hardware" checksums? */
973 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
974 /* This opens up the world of extra features. */
975 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
977 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
979 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
980 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
981 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
983 /* Individual feature bits: what can host handle? */
984 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
985 dev->hw_features |= NETIF_F_TSO;
986 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
987 dev->hw_features |= NETIF_F_TSO6;
988 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
989 dev->hw_features |= NETIF_F_TSO_ECN;
990 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
991 dev->hw_features |= NETIF_F_UFO;
994 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
995 /* (!csum && gso) case will be fixed by register_netdev() */
998 /* Configuration may specify what MAC to use. Otherwise random. */
999 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
1000 vdev->config->get(vdev,
1001 offsetof(struct virtio_net_config, mac),
1002 dev->dev_addr, dev->addr_len);
1004 random_ether_addr(dev->dev_addr);
1006 /* Set up our device-specific information */
1007 vi = netdev_priv(dev);
1008 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
1013 vi->stats = alloc_percpu(struct virtnet_stats);
1015 if (vi->stats == NULL)
1018 INIT_DELAYED_WORK(&vi->refill, refill_work);
1019 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1020 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
1022 /* If we can receive ANY GSO packets, we must allocate large ones. */
1023 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1024 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1025 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1026 vi->big_packets = true;
1028 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1029 vi->mergeable_rx_bufs = true;
1031 /* We expect two virtqueues, receive then send,
1032 * and optionally control. */
1033 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
1035 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
1042 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
1045 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1046 dev->features |= NETIF_F_HW_VLAN_FILTER;
1049 err = register_netdev(dev);
1051 pr_debug("virtio_net: registering device failed\n");
1055 /* Last of all, set up some receive buffers. */
1056 try_fill_recv(vi, GFP_KERNEL);
1058 /* If we didn't even get one input buffer, we're useless. */
1064 /* Assume link up if device can't report link status,
1065 otherwise get link status from config. */
1066 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1067 netif_carrier_off(dev);
1068 virtnet_update_status(vi);
1070 vi->status = VIRTIO_NET_S_LINK_UP;
1071 netif_carrier_on(dev);
1074 pr_debug("virtnet: registered device %s\n", dev->name);
1078 unregister_netdev(dev);
1079 cancel_delayed_work_sync(&vi->refill);
1081 vdev->config->del_vqs(vdev);
1083 free_percpu(vi->stats);
1089 static void free_unused_bufs(struct virtnet_info *vi)
1093 buf = virtqueue_detach_unused_buf(vi->svq);
1099 buf = virtqueue_detach_unused_buf(vi->rvq);
1102 if (vi->mergeable_rx_bufs || vi->big_packets)
1103 give_pages(vi, buf);
1108 BUG_ON(vi->num != 0);
1111 static void __devexit virtnet_remove(struct virtio_device *vdev)
1113 struct virtnet_info *vi = vdev->priv;
1115 /* Stop all the virtqueues. */
1116 vdev->config->reset(vdev);
1119 unregister_netdev(vi->dev);
1120 cancel_delayed_work_sync(&vi->refill);
1122 /* Free unused buffers in both send and recv, if any. */
1123 free_unused_bufs(vi);
1125 vdev->config->del_vqs(vi->vdev);
1128 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1130 free_percpu(vi->stats);
1131 free_netdev(vi->dev);
1134 static struct virtio_device_id id_table[] = {
1135 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1139 static unsigned int features[] = {
1140 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1141 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1142 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1143 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1144 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1145 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1146 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1149 static struct virtio_driver virtio_net_driver = {
1150 .feature_table = features,
1151 .feature_table_size = ARRAY_SIZE(features),
1152 .driver.name = KBUILD_MODNAME,
1153 .driver.owner = THIS_MODULE,
1154 .id_table = id_table,
1155 .probe = virtnet_probe,
1156 .remove = __devexit_p(virtnet_remove),
1157 .config_changed = virtnet_config_changed,
1160 static int __init init(void)
1162 return register_virtio_driver(&virtio_net_driver);
1165 static void __exit fini(void)
1167 unregister_virtio_driver(&virtio_net_driver);
1172 MODULE_DEVICE_TABLE(virtio, id_table);
1173 MODULE_DESCRIPTION("Virtio network driver");
1174 MODULE_LICENSE("GPL");