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;
101 struct padded_vnet_hdr {
102 struct virtio_net_hdr hdr;
104 * virtio_net_hdr should be in a separated sg buffer because of a
105 * QEMU bug, and data sg buffer shares same page with this header sg.
106 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
111 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
113 return (struct skb_vnet_hdr *)skb->cb;
117 * private is used to chain pages for big packets, put the whole
118 * most recent used list in the beginning for reuse
120 static void give_pages(struct virtnet_info *vi, struct page *page)
124 /* Find end of list, sew whole thing into vi->pages. */
125 for (end = page; end->private; end = (struct page *)end->private);
126 end->private = (unsigned long)vi->pages;
130 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
132 struct page *p = vi->pages;
135 vi->pages = (struct page *)p->private;
136 /* clear private here, it is used to chain pages */
139 p = alloc_page(gfp_mask);
143 static void skb_xmit_done(struct virtqueue *svq)
145 struct virtnet_info *vi = svq->vdev->priv;
147 /* Suppress further interrupts. */
148 virtqueue_disable_cb(svq);
150 /* We were probably waiting for more output buffers. */
151 netif_wake_queue(vi->dev);
154 static void set_skb_frag(struct sk_buff *skb, struct page *page,
155 unsigned int offset, unsigned int *len)
157 int size = min((unsigned)PAGE_SIZE - offset, *len);
158 int i = skb_shinfo(skb)->nr_frags;
160 __skb_fill_page_desc(skb, i, page, offset, size);
162 skb->data_len += size;
164 skb->truesize += PAGE_SIZE;
165 skb_shinfo(skb)->nr_frags++;
169 /* Called from bottom half context */
170 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
171 struct page *page, unsigned int len)
174 struct skb_vnet_hdr *hdr;
175 unsigned int copy, hdr_len, offset;
178 p = page_address(page);
180 /* copy small packet so we can reuse these pages for small data */
181 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
185 hdr = skb_vnet_hdr(skb);
187 if (vi->mergeable_rx_bufs) {
188 hdr_len = sizeof hdr->mhdr;
191 hdr_len = sizeof hdr->hdr;
192 offset = sizeof(struct padded_vnet_hdr);
195 memcpy(hdr, p, hdr_len);
201 if (copy > skb_tailroom(skb))
202 copy = skb_tailroom(skb);
203 memcpy(skb_put(skb, copy), p, copy);
209 * Verify that we can indeed put this data into a skb.
210 * This is here to handle cases when the device erroneously
211 * tries to receive more than is possible. This is usually
212 * the case of a broken device.
214 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
216 pr_debug("%s: too much data\n", skb->dev->name);
222 set_skb_frag(skb, page, offset, &len);
223 page = (struct page *)page->private;
228 give_pages(vi, page);
233 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
235 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
239 num_buf = hdr->mhdr.num_buffers;
241 i = skb_shinfo(skb)->nr_frags;
242 if (i >= MAX_SKB_FRAGS) {
243 pr_debug("%s: packet too long\n", skb->dev->name);
244 skb->dev->stats.rx_length_errors++;
247 page = virtqueue_get_buf(vi->rvq, &len);
249 pr_debug("%s: rx error: %d buffers missing\n",
250 skb->dev->name, hdr->mhdr.num_buffers);
251 skb->dev->stats.rx_length_errors++;
258 set_skb_frag(skb, page, 0, &len);
265 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
267 struct virtnet_info *vi = netdev_priv(dev);
268 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
271 struct skb_vnet_hdr *hdr;
273 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
274 pr_debug("%s: short packet %i\n", dev->name, len);
275 dev->stats.rx_length_errors++;
276 if (vi->mergeable_rx_bufs || vi->big_packets)
283 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
285 len -= sizeof(struct virtio_net_hdr);
289 skb = page_to_skb(vi, page, len);
290 if (unlikely(!skb)) {
291 dev->stats.rx_dropped++;
292 give_pages(vi, page);
295 if (vi->mergeable_rx_bufs)
296 if (receive_mergeable(vi, skb)) {
302 hdr = skb_vnet_hdr(skb);
304 u64_stats_update_begin(&stats->rx_syncp);
305 stats->rx_bytes += skb->len;
307 u64_stats_update_end(&stats->rx_syncp);
309 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
310 pr_debug("Needs csum!\n");
311 if (!skb_partial_csum_set(skb,
313 hdr->hdr.csum_offset))
315 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
316 skb->ip_summed = CHECKSUM_UNNECESSARY;
319 skb->protocol = eth_type_trans(skb, dev);
320 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
321 ntohs(skb->protocol), skb->len, skb->pkt_type);
323 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
325 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
326 case VIRTIO_NET_HDR_GSO_TCPV4:
327 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
329 case VIRTIO_NET_HDR_GSO_UDP:
330 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
332 case VIRTIO_NET_HDR_GSO_TCPV6:
333 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
337 printk(KERN_WARNING "%s: bad gso type %u.\n",
338 dev->name, hdr->hdr.gso_type);
342 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
343 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
345 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
346 if (skb_shinfo(skb)->gso_size == 0) {
348 printk(KERN_WARNING "%s: zero gso size.\n",
353 /* Header must be checked, and gso_segs computed. */
354 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
355 skb_shinfo(skb)->gso_segs = 0;
358 netif_receive_skb(skb);
362 dev->stats.rx_frame_errors++;
366 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
369 struct skb_vnet_hdr *hdr;
372 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
376 skb_put(skb, MAX_PACKET_LEN);
378 hdr = skb_vnet_hdr(skb);
379 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
381 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
383 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
390 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
392 struct page *first, *list = NULL;
396 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
397 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
398 first = get_a_page(vi, gfp);
401 give_pages(vi, list);
404 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
406 /* chain new page in list head to match sg */
407 first->private = (unsigned long)list;
411 first = get_a_page(vi, gfp);
413 give_pages(vi, list);
416 p = page_address(first);
418 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
419 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
420 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
422 /* vi->rx_sg[1] for data packet, from offset */
423 offset = sizeof(struct padded_vnet_hdr);
424 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
426 /* chain first in list head */
427 first->private = (unsigned long)list;
428 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
431 give_pages(vi, first);
436 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
441 page = get_a_page(vi, gfp);
445 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
447 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
449 give_pages(vi, page);
455 * Returns false if we couldn't fill entirely (OOM).
457 * Normally run in the receive path, but can also be run from ndo_open
458 * before we're receiving packets, or from refill_work which is
459 * careful to disable receiving (using napi_disable).
461 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
467 if (vi->mergeable_rx_bufs)
468 err = add_recvbuf_mergeable(vi, gfp);
469 else if (vi->big_packets)
470 err = add_recvbuf_big(vi, gfp);
472 err = add_recvbuf_small(vi, gfp);
474 oom = err == -ENOMEM;
479 if (unlikely(vi->num > vi->max))
481 virtqueue_kick(vi->rvq);
485 static void skb_recv_done(struct virtqueue *rvq)
487 struct virtnet_info *vi = rvq->vdev->priv;
488 /* Schedule NAPI, Suppress further interrupts if successful. */
489 if (napi_schedule_prep(&vi->napi)) {
490 virtqueue_disable_cb(rvq);
491 __napi_schedule(&vi->napi);
495 static void virtnet_napi_enable(struct virtnet_info *vi)
497 napi_enable(&vi->napi);
499 /* If all buffers were filled by other side before we napi_enabled, we
500 * won't get another interrupt, so process any outstanding packets
501 * now. virtnet_poll wants re-enable the queue, so we disable here.
502 * We synchronize against interrupts via NAPI_STATE_SCHED */
503 if (napi_schedule_prep(&vi->napi)) {
504 virtqueue_disable_cb(vi->rvq);
506 __napi_schedule(&vi->napi);
511 static void refill_work(struct work_struct *work)
513 struct virtnet_info *vi;
516 vi = container_of(work, struct virtnet_info, refill.work);
517 napi_disable(&vi->napi);
518 still_empty = !try_fill_recv(vi, GFP_KERNEL);
519 virtnet_napi_enable(vi);
521 /* In theory, this can happen: if we don't get any buffers in
522 * we will *never* try to fill again. */
524 queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2);
527 static int virtnet_poll(struct napi_struct *napi, int budget)
529 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
531 unsigned int len, received = 0;
534 while (received < budget &&
535 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
536 receive_buf(vi->dev, buf, len);
541 if (vi->num < vi->max / 2) {
542 if (!try_fill_recv(vi, GFP_ATOMIC))
543 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
546 /* Out of packets? */
547 if (received < budget) {
549 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
550 napi_schedule_prep(napi)) {
551 virtqueue_disable_cb(vi->rvq);
552 __napi_schedule(napi);
560 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
563 unsigned int len, tot_sgs = 0;
564 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
566 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
567 pr_debug("Sent skb %p\n", skb);
569 u64_stats_update_begin(&stats->tx_syncp);
570 stats->tx_bytes += skb->len;
572 u64_stats_update_end(&stats->tx_syncp);
574 tot_sgs += skb_vnet_hdr(skb)->num_sg;
575 dev_kfree_skb_any(skb);
580 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
582 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
583 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
585 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
587 if (skb->ip_summed == CHECKSUM_PARTIAL) {
588 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
589 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
590 hdr->hdr.csum_offset = skb->csum_offset;
593 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
596 if (skb_is_gso(skb)) {
597 hdr->hdr.hdr_len = skb_headlen(skb);
598 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
599 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
600 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
601 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
602 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
603 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
604 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
607 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
608 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
610 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
611 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
614 hdr->mhdr.num_buffers = 0;
616 /* Encode metadata header at front. */
617 if (vi->mergeable_rx_bufs)
618 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
620 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
622 hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
623 return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
627 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
629 struct virtnet_info *vi = netdev_priv(dev);
632 /* Free up any pending old buffers before queueing new ones. */
633 free_old_xmit_skbs(vi);
635 /* Try to transmit */
636 capacity = xmit_skb(vi, skb);
638 /* This can happen with OOM and indirect buffers. */
639 if (unlikely(capacity < 0)) {
640 if (likely(capacity == -ENOMEM)) {
643 "TX queue failure: out of memory\n");
645 dev->stats.tx_fifo_errors++;
648 "Unexpected TX queue failure: %d\n",
651 dev->stats.tx_dropped++;
655 virtqueue_kick(vi->svq);
657 /* Don't wait up for transmitted skbs to be freed. */
661 /* Apparently nice girls don't return TX_BUSY; stop the queue
662 * before it gets out of hand. Naturally, this wastes entries. */
663 if (capacity < 2+MAX_SKB_FRAGS) {
664 netif_stop_queue(dev);
665 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
666 /* More just got used, free them then recheck. */
667 capacity += free_old_xmit_skbs(vi);
668 if (capacity >= 2+MAX_SKB_FRAGS) {
669 netif_start_queue(dev);
670 virtqueue_disable_cb(vi->svq);
678 static int virtnet_set_mac_address(struct net_device *dev, void *p)
680 struct virtnet_info *vi = netdev_priv(dev);
681 struct virtio_device *vdev = vi->vdev;
684 ret = eth_mac_addr(dev, p);
688 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
689 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
690 dev->dev_addr, dev->addr_len);
695 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
696 struct rtnl_link_stats64 *tot)
698 struct virtnet_info *vi = netdev_priv(dev);
702 for_each_possible_cpu(cpu) {
703 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
704 u64 tpackets, tbytes, rpackets, rbytes;
707 start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
708 tpackets = stats->tx_packets;
709 tbytes = stats->tx_bytes;
710 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
713 start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
714 rpackets = stats->rx_packets;
715 rbytes = stats->rx_bytes;
716 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
718 tot->rx_packets += rpackets;
719 tot->tx_packets += tpackets;
720 tot->rx_bytes += rbytes;
721 tot->tx_bytes += tbytes;
724 tot->tx_dropped = dev->stats.tx_dropped;
725 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
726 tot->rx_dropped = dev->stats.rx_dropped;
727 tot->rx_length_errors = dev->stats.rx_length_errors;
728 tot->rx_frame_errors = dev->stats.rx_frame_errors;
733 #ifdef CONFIG_NET_POLL_CONTROLLER
734 static void virtnet_netpoll(struct net_device *dev)
736 struct virtnet_info *vi = netdev_priv(dev);
738 napi_schedule(&vi->napi);
742 static int virtnet_open(struct net_device *dev)
744 struct virtnet_info *vi = netdev_priv(dev);
746 /* Make sure we have some buffers: if oom use wq. */
747 if (!try_fill_recv(vi, GFP_KERNEL))
748 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
750 virtnet_napi_enable(vi);
755 * Send command via the control virtqueue and check status. Commands
756 * supported by the hypervisor, as indicated by feature bits, should
757 * never fail unless improperly formated.
759 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
760 struct scatterlist *data, int out, int in)
762 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
763 struct virtio_net_ctrl_hdr ctrl;
764 virtio_net_ctrl_ack status = ~0;
768 /* Caller should know better */
769 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
770 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
772 out++; /* Add header */
773 in++; /* Add return status */
778 sg_init_table(sg, out + in);
780 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
781 for_each_sg(data, s, out + in - 2, i)
782 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
783 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
785 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
787 virtqueue_kick(vi->cvq);
790 * Spin for a response, the kick causes an ioport write, trapping
791 * into the hypervisor, so the request should be handled immediately.
793 while (!virtqueue_get_buf(vi->cvq, &tmp))
796 return status == VIRTIO_NET_OK;
799 static void virtnet_ack_link_announce(struct virtnet_info *vi)
802 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
803 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL,
805 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
809 static int virtnet_close(struct net_device *dev)
811 struct virtnet_info *vi = netdev_priv(dev);
813 /* Make sure refill_work doesn't re-enable napi! */
814 cancel_delayed_work_sync(&vi->refill);
815 napi_disable(&vi->napi);
820 static void virtnet_set_rx_mode(struct net_device *dev)
822 struct virtnet_info *vi = netdev_priv(dev);
823 struct scatterlist sg[2];
824 u8 promisc, allmulti;
825 struct virtio_net_ctrl_mac *mac_data;
826 struct netdev_hw_addr *ha;
832 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
833 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
836 promisc = ((dev->flags & IFF_PROMISC) != 0);
837 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
839 sg_init_one(sg, &promisc, sizeof(promisc));
841 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
842 VIRTIO_NET_CTRL_RX_PROMISC,
844 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
845 promisc ? "en" : "dis");
847 sg_init_one(sg, &allmulti, sizeof(allmulti));
849 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
850 VIRTIO_NET_CTRL_RX_ALLMULTI,
852 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
853 allmulti ? "en" : "dis");
855 uc_count = netdev_uc_count(dev);
856 mc_count = netdev_mc_count(dev);
857 /* MAC filter - use one buffer for both lists */
858 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
859 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
862 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
866 sg_init_table(sg, 2);
868 /* Store the unicast list and count in the front of the buffer */
869 mac_data->entries = uc_count;
871 netdev_for_each_uc_addr(ha, dev)
872 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
874 sg_set_buf(&sg[0], mac_data,
875 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
877 /* multicast list and count fill the end */
878 mac_data = (void *)&mac_data->macs[uc_count][0];
880 mac_data->entries = mc_count;
882 netdev_for_each_mc_addr(ha, dev)
883 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
885 sg_set_buf(&sg[1], mac_data,
886 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
888 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
889 VIRTIO_NET_CTRL_MAC_TABLE_SET,
891 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
896 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
898 struct virtnet_info *vi = netdev_priv(dev);
899 struct scatterlist sg;
901 sg_init_one(&sg, &vid, sizeof(vid));
903 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
904 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
905 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
909 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
911 struct virtnet_info *vi = netdev_priv(dev);
912 struct scatterlist sg;
914 sg_init_one(&sg, &vid, sizeof(vid));
916 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
917 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
918 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
922 static void virtnet_get_ringparam(struct net_device *dev,
923 struct ethtool_ringparam *ring)
925 struct virtnet_info *vi = netdev_priv(dev);
927 ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
928 ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
929 ring->rx_pending = ring->rx_max_pending;
930 ring->tx_pending = ring->tx_max_pending;
935 static void virtnet_get_drvinfo(struct net_device *dev,
936 struct ethtool_drvinfo *info)
938 struct virtnet_info *vi = netdev_priv(dev);
939 struct virtio_device *vdev = vi->vdev;
941 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
942 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
943 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
947 static const struct ethtool_ops virtnet_ethtool_ops = {
948 .get_drvinfo = virtnet_get_drvinfo,
949 .get_link = ethtool_op_get_link,
950 .get_ringparam = virtnet_get_ringparam,
954 #define MAX_MTU 65535
956 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
958 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
964 static const struct net_device_ops virtnet_netdev = {
965 .ndo_open = virtnet_open,
966 .ndo_stop = virtnet_close,
967 .ndo_start_xmit = start_xmit,
968 .ndo_validate_addr = eth_validate_addr,
969 .ndo_set_mac_address = virtnet_set_mac_address,
970 .ndo_set_rx_mode = virtnet_set_rx_mode,
971 .ndo_change_mtu = virtnet_change_mtu,
972 .ndo_get_stats64 = virtnet_stats,
973 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
974 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
975 #ifdef CONFIG_NET_POLL_CONTROLLER
976 .ndo_poll_controller = virtnet_netpoll,
980 static void virtnet_config_changed_work(struct work_struct *work)
982 struct virtnet_info *vi =
983 container_of(work, struct virtnet_info, config_work);
986 mutex_lock(&vi->config_lock);
987 if (!vi->config_enable)
990 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
991 offsetof(struct virtio_net_config, status),
995 if (v & VIRTIO_NET_S_ANNOUNCE) {
996 netif_notify_peers(vi->dev);
997 virtnet_ack_link_announce(vi);
1000 /* Ignore unknown (future) status bits */
1001 v &= VIRTIO_NET_S_LINK_UP;
1003 if (vi->status == v)
1008 if (vi->status & VIRTIO_NET_S_LINK_UP) {
1009 netif_carrier_on(vi->dev);
1010 netif_wake_queue(vi->dev);
1012 netif_carrier_off(vi->dev);
1013 netif_stop_queue(vi->dev);
1016 mutex_unlock(&vi->config_lock);
1019 static void virtnet_config_changed(struct virtio_device *vdev)
1021 struct virtnet_info *vi = vdev->priv;
1023 queue_work(system_nrt_wq, &vi->config_work);
1026 static int init_vqs(struct virtnet_info *vi)
1028 struct virtqueue *vqs[3];
1029 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
1030 const char *names[] = { "input", "output", "control" };
1033 /* We expect two virtqueues, receive then send,
1034 * and optionally control. */
1035 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
1037 err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
1044 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
1047 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1048 vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1053 static int virtnet_probe(struct virtio_device *vdev)
1056 struct net_device *dev;
1057 struct virtnet_info *vi;
1059 /* Allocate ourselves a network device with room for our info */
1060 dev = alloc_etherdev(sizeof(struct virtnet_info));
1064 /* Set up network device as normal. */
1065 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1066 dev->netdev_ops = &virtnet_netdev;
1067 dev->features = NETIF_F_HIGHDMA;
1069 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1070 SET_NETDEV_DEV(dev, &vdev->dev);
1072 /* Do we support "hardware" checksums? */
1073 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1074 /* This opens up the world of extra features. */
1075 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1077 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1079 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1080 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1081 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1083 /* Individual feature bits: what can host handle? */
1084 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1085 dev->hw_features |= NETIF_F_TSO;
1086 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1087 dev->hw_features |= NETIF_F_TSO6;
1088 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1089 dev->hw_features |= NETIF_F_TSO_ECN;
1090 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1091 dev->hw_features |= NETIF_F_UFO;
1094 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1095 /* (!csum && gso) case will be fixed by register_netdev() */
1098 /* Configuration may specify what MAC to use. Otherwise random. */
1099 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1100 offsetof(struct virtio_net_config, mac),
1101 dev->dev_addr, dev->addr_len) < 0)
1102 eth_hw_addr_random(dev);
1104 /* Set up our device-specific information */
1105 vi = netdev_priv(dev);
1106 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
1111 vi->stats = alloc_percpu(struct virtnet_stats);
1113 if (vi->stats == NULL)
1116 INIT_DELAYED_WORK(&vi->refill, refill_work);
1117 mutex_init(&vi->config_lock);
1118 vi->config_enable = true;
1119 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
1120 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1121 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
1123 /* If we can receive ANY GSO packets, we must allocate large ones. */
1124 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1125 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1126 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1127 vi->big_packets = true;
1129 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1130 vi->mergeable_rx_bufs = true;
1136 err = register_netdev(dev);
1138 pr_debug("virtio_net: registering device failed\n");
1142 /* Last of all, set up some receive buffers. */
1143 try_fill_recv(vi, GFP_KERNEL);
1145 /* If we didn't even get one input buffer, we're useless. */
1151 /* Assume link up if device can't report link status,
1152 otherwise get link status from config. */
1153 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1154 netif_carrier_off(dev);
1155 queue_work(system_nrt_wq, &vi->config_work);
1157 vi->status = VIRTIO_NET_S_LINK_UP;
1158 netif_carrier_on(dev);
1161 pr_debug("virtnet: registered device %s\n", dev->name);
1165 unregister_netdev(dev);
1167 vdev->config->del_vqs(vdev);
1169 free_percpu(vi->stats);
1175 static void free_unused_bufs(struct virtnet_info *vi)
1179 buf = virtqueue_detach_unused_buf(vi->svq);
1185 buf = virtqueue_detach_unused_buf(vi->rvq);
1188 if (vi->mergeable_rx_bufs || vi->big_packets)
1189 give_pages(vi, buf);
1194 BUG_ON(vi->num != 0);
1197 static void remove_vq_common(struct virtnet_info *vi)
1199 vi->vdev->config->reset(vi->vdev);
1201 /* Free unused buffers in both send and recv, if any. */
1202 free_unused_bufs(vi);
1204 vi->vdev->config->del_vqs(vi->vdev);
1207 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1210 static void __devexit virtnet_remove(struct virtio_device *vdev)
1212 struct virtnet_info *vi = vdev->priv;
1214 /* Prevent config work handler from accessing the device. */
1215 mutex_lock(&vi->config_lock);
1216 vi->config_enable = false;
1217 mutex_unlock(&vi->config_lock);
1219 unregister_netdev(vi->dev);
1221 remove_vq_common(vi);
1223 flush_work(&vi->config_work);
1225 free_percpu(vi->stats);
1226 free_netdev(vi->dev);
1230 static int virtnet_freeze(struct virtio_device *vdev)
1232 struct virtnet_info *vi = vdev->priv;
1234 /* Prevent config work handler from accessing the device */
1235 mutex_lock(&vi->config_lock);
1236 vi->config_enable = false;
1237 mutex_unlock(&vi->config_lock);
1239 netif_device_detach(vi->dev);
1240 cancel_delayed_work_sync(&vi->refill);
1242 if (netif_running(vi->dev))
1243 napi_disable(&vi->napi);
1245 remove_vq_common(vi);
1247 flush_work(&vi->config_work);
1252 static int virtnet_restore(struct virtio_device *vdev)
1254 struct virtnet_info *vi = vdev->priv;
1261 if (netif_running(vi->dev))
1262 virtnet_napi_enable(vi);
1264 netif_device_attach(vi->dev);
1266 if (!try_fill_recv(vi, GFP_KERNEL))
1267 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
1269 mutex_lock(&vi->config_lock);
1270 vi->config_enable = true;
1271 mutex_unlock(&vi->config_lock);
1277 static struct virtio_device_id id_table[] = {
1278 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1282 static unsigned int features[] = {
1283 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1284 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1285 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1286 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1287 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1288 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1289 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1290 VIRTIO_NET_F_GUEST_ANNOUNCE,
1293 static struct virtio_driver virtio_net_driver = {
1294 .feature_table = features,
1295 .feature_table_size = ARRAY_SIZE(features),
1296 .driver.name = KBUILD_MODNAME,
1297 .driver.owner = THIS_MODULE,
1298 .id_table = id_table,
1299 .probe = virtnet_probe,
1300 .remove = __devexit_p(virtnet_remove),
1301 .config_changed = virtnet_config_changed,
1303 .freeze = virtnet_freeze,
1304 .restore = virtnet_restore,
1308 static int __init init(void)
1310 return register_virtio_driver(&virtio_net_driver);
1313 static void __exit fini(void)
1315 unregister_virtio_driver(&virtio_net_driver);
1320 MODULE_DEVICE_TABLE(virtio, id_table);
1321 MODULE_DESCRIPTION("Virtio network driver");
1322 MODULE_LICENSE("GPL");