//#define DEBUG
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_net.h>
/* The skb we couldn't send because buffers were full. */
struct sk_buff *last_xmit_skb;
+ /* If we need to free in a timer, this is it. */
+ struct timer_list xmit_free_timer;
+
/* Number of input buffers, and max we've ever had. */
unsigned int num, max;
/* For cleaning up after transmission. */
struct tasklet_struct tasklet;
+ bool free_in_tasklet;
+
+ /* I like... big packets and I cannot lie! */
+ bool big_packets;
/* Receive & send queues. */
struct sk_buff_head recv;
struct sk_buff_head send;
+
+ /* Chain pages by the private ptr. */
+ struct page *pages;
};
static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb)
sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr));
}
+static void give_a_page(struct virtnet_info *vi, struct page *page)
+{
+ page->private = (unsigned long)vi->pages;
+ vi->pages = page;
+}
+
+static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
+{
+ struct page *p = vi->pages;
+
+ if (p)
+ vi->pages = (struct page *)p->private;
+ else
+ p = alloc_page(gfp_mask);
+ return p;
+}
+
static void skb_xmit_done(struct virtqueue *svq)
{
struct virtnet_info *vi = svq->vdev->priv;
/* Suppress further interrupts. */
svq->vq_ops->disable_cb(svq);
- /* We were waiting for more output buffers. */
+ /* We were probably waiting for more output buffers. */
netif_wake_queue(vi->dev);
/* Make sure we re-xmit last_xmit_skb: if there are no more packets
unsigned len)
{
struct virtio_net_hdr *hdr = skb_vnet_hdr(skb);
+ int err;
if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
pr_debug("%s: short packet %i\n", dev->name, len);
goto drop;
}
len -= sizeof(struct virtio_net_hdr);
- BUG_ON(len > MAX_PACKET_LEN);
- skb_trim(skb, len);
- skb->protocol = eth_type_trans(skb, dev);
- pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
- ntohs(skb->protocol), skb->len, skb->pkt_type);
+ if (len <= MAX_PACKET_LEN) {
+ unsigned int i;
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
+ give_a_page(dev->priv, skb_shinfo(skb)->frags[i].page);
+ skb->data_len = 0;
+ skb_shinfo(skb)->nr_frags = 0;
+ }
+
+ err = pskb_trim(skb, len);
+ if (err) {
+ pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err);
+ dev->stats.rx_dropped++;
+ goto drop;
+ }
+ skb->truesize += skb->data_len;
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
goto frame_err;
}
+ skb->protocol = eth_type_trans(skb, dev);
+ pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
+ ntohs(skb->protocol), skb->len, skb->pkt_type);
+
if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
pr_debug("GSO!\n");
switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
{
struct sk_buff *skb;
struct scatterlist sg[2+MAX_SKB_FRAGS];
- int num, err;
+ int num, err, i;
sg_init_table(sg, 2+MAX_SKB_FRAGS);
for (;;) {
skb_put(skb, MAX_PACKET_LEN);
vnet_hdr_to_sg(sg, skb);
+
+ if (vi->big_packets) {
+ for (i = 0; i < MAX_SKB_FRAGS; i++) {
+ skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+ f->page = get_a_page(vi, GFP_ATOMIC);
+ if (!f->page)
+ break;
+
+ f->page_offset = 0;
+ f->size = PAGE_SIZE;
+
+ skb->data_len += PAGE_SIZE;
+ skb->len += PAGE_SIZE;
+
+ skb_shinfo(skb)->nr_frags++;
+ }
+ }
+
num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
skb_queue_head(&vi->recv, skb);
}
}
+/* If the virtio transport doesn't always notify us when all in-flight packets
+ * are consumed, we fall back to using this function on a timer to free them. */
+static void xmit_free(unsigned long data)
+{
+ struct virtnet_info *vi = (void *)data;
+
+ netif_tx_lock(vi->dev);
+
+ free_old_xmit_skbs(vi);
+
+ if (!skb_queue_empty(&vi->send))
+ mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
+
+ netif_tx_unlock(vi->dev);
+}
+
static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
{
- int num;
+ int num, err;
struct scatterlist sg[2+MAX_SKB_FRAGS];
struct virtio_net_hdr *hdr;
const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
vnet_hdr_to_sg(sg, skb);
num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
- return vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
+ err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
+ if (!err && !vi->free_in_tasklet)
+ mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
+
+ return err;
}
static void xmit_tasklet(unsigned long data)
vi->svq->vq_ops->kick(vi->svq);
vi->last_xmit_skb = NULL;
}
+ if (vi->free_in_tasklet)
+ free_old_xmit_skbs(vi);
netif_tx_unlock_bh(vi->dev);
}
free_old_xmit_skbs(vi);
/* If we has a buffer left over from last time, send it now. */
- if (unlikely(vi->last_xmit_skb)) {
- if (xmit_skb(vi, vi->last_xmit_skb) != 0) {
- /* Drop this skb: we only queue one. */
- vi->dev->stats.tx_dropped++;
- kfree_skb(skb);
- skb = NULL;
- goto stop_queue;
- }
- vi->last_xmit_skb = NULL;
- }
+ if (unlikely(vi->last_xmit_skb) &&
+ xmit_skb(vi, vi->last_xmit_skb) != 0)
+ goto stop_queue;
+
+ vi->last_xmit_skb = NULL;
/* Put new one in send queue and do transmit */
if (likely(skb)) {
netif_start_queue(dev);
goto again;
}
+ if (skb) {
+ /* Drop this skb: we only queue one. */
+ vi->dev->stats.tx_dropped++;
+ kfree_skb(skb);
+ }
goto done;
}
return 0;
}
+static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct virtio_device *vdev = vi->vdev;
+
+ if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
+ return -ENOSYS;
+
+ return ethtool_op_set_tx_hw_csum(dev, data);
+}
+
+static struct ethtool_ops virtnet_ethtool_ops = {
+ .set_tx_csum = virtnet_set_tx_csum,
+ .set_sg = ethtool_op_set_sg,
+};
+
static int virtnet_probe(struct virtio_device *vdev)
{
int err;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = virtnet_netpoll;
#endif
+ SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
SET_NETDEV_DEV(dev, &vdev->dev);
/* Do we support "hardware" checksums? */
vi->dev = dev;
vi->vdev = vdev;
vdev->priv = vi;
+ vi->pages = NULL;
+
+ /* If they give us a callback when all buffers are done, we don't need
+ * the timer. */
+ vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY);
+
+ /* If we can receive ANY GSO packets, we must allocate large ones. */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
+ || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
+ || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
+ vi->big_packets = true;
/* We expect two virtqueues, receive then send. */
vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done);
tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi);
+ if (!vi->free_in_tasklet)
+ setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi);
+
err = register_netdev(dev);
if (err) {
pr_debug("virtio_net: registering device failed\n");
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
+ if (!vi->free_in_tasklet)
+ del_timer_sync(&vi->xmit_free_timer);
+
/* Free our skbs in send and recv queues, if any. */
while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
kfree_skb(skb);
vdev->config->del_vq(vi->svq);
vdev->config->del_vq(vi->rvq);
unregister_netdev(vi->dev);
+
+ while (vi->pages)
+ __free_pages(get_a_page(vi, GFP_KERNEL), 0);
+
free_netdev(vi->dev);
}
};
static unsigned int features[] = {
- VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
+ VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
+ VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
- VIRTIO_NET_F_HOST_ECN,
+ VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
+ VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */
+ VIRTIO_F_NOTIFY_ON_EMPTY,
};
static struct virtio_driver virtio_net = {
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