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 bool csum = true, gso = true;
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
42 #define VIRTNET_DRIVER_VERSION "1.0.0"
44 struct virtnet_stats {
45 struct u64_stats_sync tx_syncp;
46 struct u64_stats_sync rx_syncp;
55 struct virtio_device *vdev;
56 struct virtqueue *rvq, *svq, *cvq;
57 struct net_device *dev;
58 struct napi_struct napi;
61 /* Number of input buffers, and max we've ever had. */
62 unsigned int num, max;
64 /* I like... big packets and I cannot lie! */
67 /* Host will merge rx buffers for big packets (shake it! shake it!) */
68 bool mergeable_rx_bufs;
70 /* enable config space updates */
73 /* Active statistics */
74 struct virtnet_stats __percpu *stats;
76 /* Work struct for refilling if we run low on memory. */
77 struct delayed_work refill;
79 /* Work struct for config space updates */
80 struct work_struct config_work;
82 /* Lock for config space updates */
83 struct mutex config_lock;
85 /* Chain pages by the private ptr. */
88 /* fragments + linear part + virtio header */
89 struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
90 struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
95 struct virtio_net_hdr hdr;
96 struct virtio_net_hdr_mrg_rxbuf mhdr;
100 struct padded_vnet_hdr {
101 struct virtio_net_hdr hdr;
103 * virtio_net_hdr should be in a separated sg buffer because of a
104 * QEMU bug, and data sg buffer shares same page with this header sg.
105 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
110 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
112 return (struct skb_vnet_hdr *)skb->cb;
116 * private is used to chain pages for big packets, put the whole
117 * most recent used list in the beginning for reuse
119 static void give_pages(struct virtnet_info *vi, struct page *page)
123 /* Find end of list, sew whole thing into vi->pages. */
124 for (end = page; end->private; end = (struct page *)end->private);
125 end->private = (unsigned long)vi->pages;
129 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
131 struct page *p = vi->pages;
134 vi->pages = (struct page *)p->private;
135 /* clear private here, it is used to chain pages */
138 p = alloc_page(gfp_mask);
142 static void skb_xmit_done(struct virtqueue *svq)
144 struct virtnet_info *vi = svq->vdev->priv;
146 /* Suppress further interrupts. */
147 virtqueue_disable_cb(svq);
149 /* We were probably waiting for more output buffers. */
150 netif_wake_queue(vi->dev);
153 static void set_skb_frag(struct sk_buff *skb, struct page *page,
154 unsigned int offset, unsigned int *len)
156 int size = min((unsigned)PAGE_SIZE - offset, *len);
157 int i = skb_shinfo(skb)->nr_frags;
159 __skb_fill_page_desc(skb, i, page, offset, size);
161 skb->data_len += size;
163 skb->truesize += PAGE_SIZE;
164 skb_shinfo(skb)->nr_frags++;
168 /* Called from bottom half context */
169 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
170 struct page *page, unsigned int len)
173 struct skb_vnet_hdr *hdr;
174 unsigned int copy, hdr_len, offset;
177 p = page_address(page);
179 /* copy small packet so we can reuse these pages for small data */
180 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
184 hdr = skb_vnet_hdr(skb);
186 if (vi->mergeable_rx_bufs) {
187 hdr_len = sizeof hdr->mhdr;
190 hdr_len = sizeof hdr->hdr;
191 offset = sizeof(struct padded_vnet_hdr);
194 memcpy(hdr, p, hdr_len);
200 if (copy > skb_tailroom(skb))
201 copy = skb_tailroom(skb);
202 memcpy(skb_put(skb, copy), p, copy);
208 * Verify that we can indeed put this data into a skb.
209 * This is here to handle cases when the device erroneously
210 * tries to receive more than is possible. This is usually
211 * the case of a broken device.
213 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
215 pr_debug("%s: too much data\n", skb->dev->name);
221 set_skb_frag(skb, page, offset, &len);
222 page = (struct page *)page->private;
227 give_pages(vi, page);
232 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
234 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
238 num_buf = hdr->mhdr.num_buffers;
240 i = skb_shinfo(skb)->nr_frags;
241 if (i >= MAX_SKB_FRAGS) {
242 pr_debug("%s: packet too long\n", skb->dev->name);
243 skb->dev->stats.rx_length_errors++;
246 page = virtqueue_get_buf(vi->rvq, &len);
248 pr_debug("%s: rx error: %d buffers missing\n",
249 skb->dev->name, hdr->mhdr.num_buffers);
250 skb->dev->stats.rx_length_errors++;
257 set_skb_frag(skb, page, 0, &len);
264 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
266 struct virtnet_info *vi = netdev_priv(dev);
267 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
270 struct skb_vnet_hdr *hdr;
272 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
273 pr_debug("%s: short packet %i\n", dev->name, len);
274 dev->stats.rx_length_errors++;
275 if (vi->mergeable_rx_bufs || vi->big_packets)
282 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
284 len -= sizeof(struct virtio_net_hdr);
288 skb = page_to_skb(vi, page, len);
289 if (unlikely(!skb)) {
290 dev->stats.rx_dropped++;
291 give_pages(vi, page);
294 if (vi->mergeable_rx_bufs)
295 if (receive_mergeable(vi, skb)) {
301 hdr = skb_vnet_hdr(skb);
303 u64_stats_update_begin(&stats->rx_syncp);
304 stats->rx_bytes += skb->len;
306 u64_stats_update_end(&stats->rx_syncp);
308 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
309 pr_debug("Needs csum!\n");
310 if (!skb_partial_csum_set(skb,
312 hdr->hdr.csum_offset))
314 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
315 skb->ip_summed = CHECKSUM_UNNECESSARY;
318 skb->protocol = eth_type_trans(skb, dev);
319 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
320 ntohs(skb->protocol), skb->len, skb->pkt_type);
322 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
324 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
325 case VIRTIO_NET_HDR_GSO_TCPV4:
326 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
328 case VIRTIO_NET_HDR_GSO_UDP:
329 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
331 case VIRTIO_NET_HDR_GSO_TCPV6:
332 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
336 printk(KERN_WARNING "%s: bad gso type %u.\n",
337 dev->name, hdr->hdr.gso_type);
341 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
342 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
344 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
345 if (skb_shinfo(skb)->gso_size == 0) {
347 printk(KERN_WARNING "%s: zero gso size.\n",
352 /* Header must be checked, and gso_segs computed. */
353 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
354 skb_shinfo(skb)->gso_segs = 0;
357 netif_receive_skb(skb);
361 dev->stats.rx_frame_errors++;
365 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
368 struct skb_vnet_hdr *hdr;
371 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
375 skb_put(skb, MAX_PACKET_LEN);
377 hdr = skb_vnet_hdr(skb);
378 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
380 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
382 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
389 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
391 struct page *first, *list = NULL;
395 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
396 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
397 first = get_a_page(vi, gfp);
400 give_pages(vi, list);
403 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
405 /* chain new page in list head to match sg */
406 first->private = (unsigned long)list;
410 first = get_a_page(vi, gfp);
412 give_pages(vi, list);
415 p = page_address(first);
417 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
418 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
419 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
421 /* vi->rx_sg[1] for data packet, from offset */
422 offset = sizeof(struct padded_vnet_hdr);
423 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
425 /* chain first in list head */
426 first->private = (unsigned long)list;
427 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
430 give_pages(vi, first);
435 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
440 page = get_a_page(vi, gfp);
444 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
446 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
448 give_pages(vi, page);
454 * Returns false if we couldn't fill entirely (OOM).
456 * Normally run in the receive path, but can also be run from ndo_open
457 * before we're receiving packets, or from refill_work which is
458 * careful to disable receiving (using napi_disable).
460 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
466 if (vi->mergeable_rx_bufs)
467 err = add_recvbuf_mergeable(vi, gfp);
468 else if (vi->big_packets)
469 err = add_recvbuf_big(vi, gfp);
471 err = add_recvbuf_small(vi, gfp);
473 oom = err == -ENOMEM;
478 if (unlikely(vi->num > vi->max))
480 virtqueue_kick(vi->rvq);
484 static void skb_recv_done(struct virtqueue *rvq)
486 struct virtnet_info *vi = rvq->vdev->priv;
487 /* Schedule NAPI, Suppress further interrupts if successful. */
488 if (napi_schedule_prep(&vi->napi)) {
489 virtqueue_disable_cb(rvq);
490 __napi_schedule(&vi->napi);
494 static void virtnet_napi_enable(struct virtnet_info *vi)
496 napi_enable(&vi->napi);
498 /* If all buffers were filled by other side before we napi_enabled, we
499 * won't get another interrupt, so process any outstanding packets
500 * now. virtnet_poll wants re-enable the queue, so we disable here.
501 * We synchronize against interrupts via NAPI_STATE_SCHED */
502 if (napi_schedule_prep(&vi->napi)) {
503 virtqueue_disable_cb(vi->rvq);
505 __napi_schedule(&vi->napi);
510 static void refill_work(struct work_struct *work)
512 struct virtnet_info *vi;
515 vi = container_of(work, struct virtnet_info, refill.work);
516 napi_disable(&vi->napi);
517 still_empty = !try_fill_recv(vi, GFP_KERNEL);
518 virtnet_napi_enable(vi);
520 /* In theory, this can happen: if we don't get any buffers in
521 * we will *never* try to fill again. */
523 schedule_delayed_work(&vi->refill, HZ/2);
526 static int virtnet_poll(struct napi_struct *napi, int budget)
528 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
530 unsigned int len, received = 0;
533 while (received < budget &&
534 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
535 receive_buf(vi->dev, buf, len);
540 if (vi->num < vi->max / 2) {
541 if (!try_fill_recv(vi, GFP_ATOMIC))
542 schedule_delayed_work(&vi->refill, 0);
545 /* Out of packets? */
546 if (received < budget) {
548 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
549 napi_schedule_prep(napi)) {
550 virtqueue_disable_cb(vi->rvq);
551 __napi_schedule(napi);
559 static void free_old_xmit_skbs(struct virtnet_info *vi)
563 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
565 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
566 pr_debug("Sent skb %p\n", skb);
568 u64_stats_update_begin(&stats->tx_syncp);
569 stats->tx_bytes += skb->len;
571 u64_stats_update_end(&stats->tx_syncp);
573 dev_kfree_skb_any(skb);
577 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
579 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
580 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
583 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
585 if (skb->ip_summed == CHECKSUM_PARTIAL) {
586 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
587 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
588 hdr->hdr.csum_offset = skb->csum_offset;
591 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
594 if (skb_is_gso(skb)) {
595 hdr->hdr.hdr_len = skb_headlen(skb);
596 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
597 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
598 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
599 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
600 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
601 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
602 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
605 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
606 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
608 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
609 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
612 hdr->mhdr.num_buffers = 0;
614 /* Encode metadata header at front. */
615 if (vi->mergeable_rx_bufs)
616 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
618 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
620 num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
621 return virtqueue_add_buf(vi->svq, vi->tx_sg, num_sg,
625 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
627 struct virtnet_info *vi = netdev_priv(dev);
630 /* Free up any pending old buffers before queueing new ones. */
631 free_old_xmit_skbs(vi);
633 /* Try to transmit */
634 capacity = xmit_skb(vi, skb);
636 /* This can happen with OOM and indirect buffers. */
637 if (unlikely(capacity < 0)) {
638 if (likely(capacity == -ENOMEM)) {
641 "TX queue failure: out of memory\n");
643 dev->stats.tx_fifo_errors++;
646 "Unexpected TX queue failure: %d\n",
649 dev->stats.tx_dropped++;
653 virtqueue_kick(vi->svq);
655 /* Don't wait up for transmitted skbs to be freed. */
659 /* Apparently nice girls don't return TX_BUSY; stop the queue
660 * before it gets out of hand. Naturally, this wastes entries. */
661 if (capacity < 2+MAX_SKB_FRAGS) {
662 netif_stop_queue(dev);
663 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
664 /* More just got used, free them then recheck. */
665 free_old_xmit_skbs(vi);
666 capacity = vi->svq->num_free;
667 if (capacity >= 2+MAX_SKB_FRAGS) {
668 netif_start_queue(dev);
669 virtqueue_disable_cb(vi->svq);
677 static int virtnet_set_mac_address(struct net_device *dev, void *p)
679 struct virtnet_info *vi = netdev_priv(dev);
680 struct virtio_device *vdev = vi->vdev;
683 ret = eth_mac_addr(dev, p);
687 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
688 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
689 dev->dev_addr, dev->addr_len);
694 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
695 struct rtnl_link_stats64 *tot)
697 struct virtnet_info *vi = netdev_priv(dev);
701 for_each_possible_cpu(cpu) {
702 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
703 u64 tpackets, tbytes, rpackets, rbytes;
706 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
707 tpackets = stats->tx_packets;
708 tbytes = stats->tx_bytes;
709 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
712 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
713 rpackets = stats->rx_packets;
714 rbytes = stats->rx_bytes;
715 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
717 tot->rx_packets += rpackets;
718 tot->tx_packets += tpackets;
719 tot->rx_bytes += rbytes;
720 tot->tx_bytes += tbytes;
723 tot->tx_dropped = dev->stats.tx_dropped;
724 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
725 tot->rx_dropped = dev->stats.rx_dropped;
726 tot->rx_length_errors = dev->stats.rx_length_errors;
727 tot->rx_frame_errors = dev->stats.rx_frame_errors;
732 #ifdef CONFIG_NET_POLL_CONTROLLER
733 static void virtnet_netpoll(struct net_device *dev)
735 struct virtnet_info *vi = netdev_priv(dev);
737 napi_schedule(&vi->napi);
741 static int virtnet_open(struct net_device *dev)
743 struct virtnet_info *vi = netdev_priv(dev);
745 /* Make sure we have some buffers: if oom use wq. */
746 if (!try_fill_recv(vi, GFP_KERNEL))
747 schedule_delayed_work(&vi->refill, 0);
749 virtnet_napi_enable(vi);
754 * Send command via the control virtqueue and check status. Commands
755 * supported by the hypervisor, as indicated by feature bits, should
756 * never fail unless improperly formated.
758 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
759 struct scatterlist *data, int out, int in)
761 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
762 struct virtio_net_ctrl_hdr ctrl;
763 virtio_net_ctrl_ack status = ~0;
767 /* Caller should know better */
768 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
769 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
771 out++; /* Add header */
772 in++; /* Add return status */
777 sg_init_table(sg, out + in);
779 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
780 for_each_sg(data, s, out + in - 2, i)
781 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
782 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
784 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
786 virtqueue_kick(vi->cvq);
789 * Spin for a response, the kick causes an ioport write, trapping
790 * into the hypervisor, so the request should be handled immediately.
792 while (!virtqueue_get_buf(vi->cvq, &tmp))
795 return status == VIRTIO_NET_OK;
798 static void virtnet_ack_link_announce(struct virtnet_info *vi)
801 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
802 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL,
804 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
808 static int virtnet_close(struct net_device *dev)
810 struct virtnet_info *vi = netdev_priv(dev);
812 /* Make sure refill_work doesn't re-enable napi! */
813 cancel_delayed_work_sync(&vi->refill);
814 napi_disable(&vi->napi);
819 static void virtnet_set_rx_mode(struct net_device *dev)
821 struct virtnet_info *vi = netdev_priv(dev);
822 struct scatterlist sg[2];
823 u8 promisc, allmulti;
824 struct virtio_net_ctrl_mac *mac_data;
825 struct netdev_hw_addr *ha;
831 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
832 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
835 promisc = ((dev->flags & IFF_PROMISC) != 0);
836 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
838 sg_init_one(sg, &promisc, sizeof(promisc));
840 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
841 VIRTIO_NET_CTRL_RX_PROMISC,
843 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
844 promisc ? "en" : "dis");
846 sg_init_one(sg, &allmulti, sizeof(allmulti));
848 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
849 VIRTIO_NET_CTRL_RX_ALLMULTI,
851 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
852 allmulti ? "en" : "dis");
854 uc_count = netdev_uc_count(dev);
855 mc_count = netdev_mc_count(dev);
856 /* MAC filter - use one buffer for both lists */
857 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
858 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
861 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
865 sg_init_table(sg, 2);
867 /* Store the unicast list and count in the front of the buffer */
868 mac_data->entries = uc_count;
870 netdev_for_each_uc_addr(ha, dev)
871 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
873 sg_set_buf(&sg[0], mac_data,
874 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
876 /* multicast list and count fill the end */
877 mac_data = (void *)&mac_data->macs[uc_count][0];
879 mac_data->entries = mc_count;
881 netdev_for_each_mc_addr(ha, dev)
882 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
884 sg_set_buf(&sg[1], mac_data,
885 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
887 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
888 VIRTIO_NET_CTRL_MAC_TABLE_SET,
890 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
895 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
897 struct virtnet_info *vi = netdev_priv(dev);
898 struct scatterlist sg;
900 sg_init_one(&sg, &vid, sizeof(vid));
902 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
903 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
904 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
908 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
910 struct virtnet_info *vi = netdev_priv(dev);
911 struct scatterlist sg;
913 sg_init_one(&sg, &vid, sizeof(vid));
915 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
916 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
917 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
921 static void virtnet_get_ringparam(struct net_device *dev,
922 struct ethtool_ringparam *ring)
924 struct virtnet_info *vi = netdev_priv(dev);
926 ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
927 ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
928 ring->rx_pending = ring->rx_max_pending;
929 ring->tx_pending = ring->tx_max_pending;
934 static void virtnet_get_drvinfo(struct net_device *dev,
935 struct ethtool_drvinfo *info)
937 struct virtnet_info *vi = netdev_priv(dev);
938 struct virtio_device *vdev = vi->vdev;
940 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
941 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
942 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
946 static const struct ethtool_ops virtnet_ethtool_ops = {
947 .get_drvinfo = virtnet_get_drvinfo,
948 .get_link = ethtool_op_get_link,
949 .get_ringparam = virtnet_get_ringparam,
953 #define MAX_MTU 65535
955 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
957 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
963 static const struct net_device_ops virtnet_netdev = {
964 .ndo_open = virtnet_open,
965 .ndo_stop = virtnet_close,
966 .ndo_start_xmit = start_xmit,
967 .ndo_validate_addr = eth_validate_addr,
968 .ndo_set_mac_address = virtnet_set_mac_address,
969 .ndo_set_rx_mode = virtnet_set_rx_mode,
970 .ndo_change_mtu = virtnet_change_mtu,
971 .ndo_get_stats64 = virtnet_stats,
972 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
973 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
974 #ifdef CONFIG_NET_POLL_CONTROLLER
975 .ndo_poll_controller = virtnet_netpoll,
979 static void virtnet_config_changed_work(struct work_struct *work)
981 struct virtnet_info *vi =
982 container_of(work, struct virtnet_info, config_work);
985 mutex_lock(&vi->config_lock);
986 if (!vi->config_enable)
989 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
990 offsetof(struct virtio_net_config, status),
994 if (v & VIRTIO_NET_S_ANNOUNCE) {
995 netdev_notify_peers(vi->dev);
996 virtnet_ack_link_announce(vi);
999 /* Ignore unknown (future) status bits */
1000 v &= VIRTIO_NET_S_LINK_UP;
1002 if (vi->status == v)
1007 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1008 netif_carrier_on(vi->dev);
1009 netif_wake_queue(vi->dev);
1011 netif_carrier_off(vi->dev);
1012 netif_stop_queue(vi->dev);
1015 mutex_unlock(&vi->config_lock);
1018 static void virtnet_config_changed(struct virtio_device *vdev)
1020 struct virtnet_info *vi = vdev->priv;
1022 schedule_work(&vi->config_work);
1025 static int init_vqs(struct virtnet_info *vi)
1027 struct virtqueue *vqs[3];
1028 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
1029 const char *names[] = { "input", "output", "control" };
1032 /* We expect two virtqueues, receive then send,
1033 * and optionally control. */
1034 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
1036 err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
1043 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
1046 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1047 vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1052 static int virtnet_probe(struct virtio_device *vdev)
1055 struct net_device *dev;
1056 struct virtnet_info *vi;
1058 /* Allocate ourselves a network device with room for our info */
1059 dev = alloc_etherdev(sizeof(struct virtnet_info));
1063 /* Set up network device as normal. */
1064 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1065 dev->netdev_ops = &virtnet_netdev;
1066 dev->features = NETIF_F_HIGHDMA;
1068 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1069 SET_NETDEV_DEV(dev, &vdev->dev);
1071 /* Do we support "hardware" checksums? */
1072 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1073 /* This opens up the world of extra features. */
1074 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1076 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1078 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1079 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1080 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1082 /* Individual feature bits: what can host handle? */
1083 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1084 dev->hw_features |= NETIF_F_TSO;
1085 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1086 dev->hw_features |= NETIF_F_TSO6;
1087 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1088 dev->hw_features |= NETIF_F_TSO_ECN;
1089 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1090 dev->hw_features |= NETIF_F_UFO;
1093 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1094 /* (!csum && gso) case will be fixed by register_netdev() */
1097 /* Configuration may specify what MAC to use. Otherwise random. */
1098 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1099 offsetof(struct virtio_net_config, mac),
1100 dev->dev_addr, dev->addr_len) < 0)
1101 eth_hw_addr_random(dev);
1103 /* Set up our device-specific information */
1104 vi = netdev_priv(dev);
1105 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
1110 vi->stats = alloc_percpu(struct virtnet_stats);
1112 if (vi->stats == NULL)
1115 INIT_DELAYED_WORK(&vi->refill, refill_work);
1116 mutex_init(&vi->config_lock);
1117 vi->config_enable = true;
1118 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1119 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1120 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
1122 /* If we can receive ANY GSO packets, we must allocate large ones. */
1123 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1124 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1125 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1126 vi->big_packets = true;
1128 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1129 vi->mergeable_rx_bufs = true;
1135 err = register_netdev(dev);
1137 pr_debug("virtio_net: registering device failed\n");
1141 /* Last of all, set up some receive buffers. */
1142 try_fill_recv(vi, GFP_KERNEL);
1144 /* If we didn't even get one input buffer, we're useless. */
1150 /* Assume link up if device can't report link status,
1151 otherwise get link status from config. */
1152 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1153 netif_carrier_off(dev);
1154 schedule_work(&vi->config_work);
1156 vi->status = VIRTIO_NET_S_LINK_UP;
1157 netif_carrier_on(dev);
1160 pr_debug("virtnet: registered device %s\n", dev->name);
1164 unregister_netdev(dev);
1166 vdev->config->del_vqs(vdev);
1168 free_percpu(vi->stats);
1174 static void free_unused_bufs(struct virtnet_info *vi)
1178 buf = virtqueue_detach_unused_buf(vi->svq);
1184 buf = virtqueue_detach_unused_buf(vi->rvq);
1187 if (vi->mergeable_rx_bufs || vi->big_packets)
1188 give_pages(vi, buf);
1193 BUG_ON(vi->num != 0);
1196 static void remove_vq_common(struct virtnet_info *vi)
1198 vi->vdev->config->reset(vi->vdev);
1200 /* Free unused buffers in both send and recv, if any. */
1201 free_unused_bufs(vi);
1203 vi->vdev->config->del_vqs(vi->vdev);
1206 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1209 static void __devexit virtnet_remove(struct virtio_device *vdev)
1211 struct virtnet_info *vi = vdev->priv;
1213 /* Prevent config work handler from accessing the device. */
1214 mutex_lock(&vi->config_lock);
1215 vi->config_enable = false;
1216 mutex_unlock(&vi->config_lock);
1218 unregister_netdev(vi->dev);
1220 remove_vq_common(vi);
1222 flush_work(&vi->config_work);
1224 free_percpu(vi->stats);
1225 free_netdev(vi->dev);
1229 static int virtnet_freeze(struct virtio_device *vdev)
1231 struct virtnet_info *vi = vdev->priv;
1233 /* Prevent config work handler from accessing the device */
1234 mutex_lock(&vi->config_lock);
1235 vi->config_enable = false;
1236 mutex_unlock(&vi->config_lock);
1238 netif_device_detach(vi->dev);
1239 cancel_delayed_work_sync(&vi->refill);
1241 if (netif_running(vi->dev))
1242 napi_disable(&vi->napi);
1244 remove_vq_common(vi);
1246 flush_work(&vi->config_work);
1251 static int virtnet_restore(struct virtio_device *vdev)
1253 struct virtnet_info *vi = vdev->priv;
1260 if (netif_running(vi->dev))
1261 virtnet_napi_enable(vi);
1263 netif_device_attach(vi->dev);
1265 if (!try_fill_recv(vi, GFP_KERNEL))
1266 schedule_delayed_work(&vi->refill, 0);
1268 mutex_lock(&vi->config_lock);
1269 vi->config_enable = true;
1270 mutex_unlock(&vi->config_lock);
1276 static struct virtio_device_id id_table[] = {
1277 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1281 static unsigned int features[] = {
1282 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1283 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1284 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1285 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1286 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1287 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1288 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1289 VIRTIO_NET_F_GUEST_ANNOUNCE,
1292 static struct virtio_driver virtio_net_driver = {
1293 .feature_table = features,
1294 .feature_table_size = ARRAY_SIZE(features),
1295 .driver.name = KBUILD_MODNAME,
1296 .driver.owner = THIS_MODULE,
1297 .id_table = id_table,
1298 .probe = virtnet_probe,
1299 .remove = __devexit_p(virtnet_remove),
1300 .config_changed = virtnet_config_changed,
1302 .freeze = virtnet_freeze,
1303 .restore = virtnet_restore,
1307 static int __init init(void)
1309 return register_virtio_driver(&virtio_net_driver);
1312 static void __exit fini(void)
1314 unregister_virtio_driver(&virtio_net_driver);
1319 MODULE_DEVICE_TABLE(virtio, id_table);
1320 MODULE_DESCRIPTION("Virtio network driver");
1321 MODULE_LICENSE("GPL");