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virtio_net: remove send queue 

Now we have a virtio detach API (in commit
f9bfbebf34), we don't need to track xmit
skbs in the virio_net driver, which improves transmission performance.

Signed-off-by: Shirley Ma <xma@us.ibm.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shirley Ma 2010-02-08 14:14:42 +00:00 committed by David S. Miller
parent b25822ca5e
commit 830a8a976f
1 changed files with 8 additions and 18 deletions
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26
drivers/net/virtio_net.c
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@ -56,9 +56,6 @@ struct virtnet_info
/* Host will merge rx buffers for big packets (shake it! shake it!) */
bool mergeable_rx_bufs;
/* Send queue. */
struct sk_buff_head send;
/* Work struct for refilling if we run low on memory. */
struct delayed_work refill;
@ -505,7 +502,6 @@ static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
pr_debug("Sent skb %p\n", skb);
__skb_unlink(skb, &vi->send);
vi->dev->stats.tx_bytes += skb->len;
vi->dev->stats.tx_packets++;
tot_sgs += skb_vnet_hdr(skb)->num_sg;
@ -588,15 +584,6 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
}
vi->svq->vq_ops->kick(vi->svq);
/*
* Put new one in send queue. You'd expect we'd need this before
* xmit_skb calls add_buf(), since the callback can be triggered
* immediately after that. But since the callback just triggers
* another call back here, normal network xmit locking prevents the
* race.
*/
__skb_queue_head(&vi->send, skb);
/* Don't wait up for transmitted skbs to be freed. */
skb_orphan(skb);
nf_reset(skb);
@ -980,9 +967,6 @@ static int virtnet_probe(struct virtio_device *vdev)
dev->features |= NETIF_F_HW_VLAN_FILTER;
}
/* Initialize our empty send queue. */
skb_queue_head_init(&vi->send);
err = register_netdev(dev);
if (err) {
pr_debug("virtio_net: registering device failed\n");
@ -1018,6 +1002,12 @@ static int virtnet_probe(struct virtio_device *vdev)
static void free_unused_bufs(struct virtnet_info *vi)
{
void *buf;
while (1) {
buf = vi->svq->vq_ops->detach_unused_buf(vi->svq);
if (!buf)
break;
dev_kfree_skb(buf);
}
while (1) {
buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq);
if (!buf)
@ -1038,11 +1028,11 @@ static void __devexit virtnet_remove(struct virtio_device *vdev)
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
/* Free our skbs in send queue, if any. */
__skb_queue_purge(&vi->send);
unregister_netdev(vi->dev);
cancel_delayed_work_sync(&vi->refill);
/* Free unused buffers in both send and recv, if any. */
free_unused_bufs(vi);
vdev->config->del_vqs(vi->vdev);