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authorShirley Ma <mashirle@us.ibm.com>2010-02-08 14:14:42 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-12 12:27:56 -0800
commit830a8a976ff2236ebc383e9a06f7872ed9243bfb (patch)
treee8feeab919a37d6aaadb2a896c07c734c922967a /drivers/net/virtio_net.c
parentb25822ca5e3d6551b74506e2c69afada7c29c967 (diff)
downloadop-kernel-dev-830a8a976ff2236ebc383e9a06f7872ed9243bfb.zip
op-kernel-dev-830a8a976ff2236ebc383e9a06f7872ed9243bfb.tar.gz
virtio_net: remove send queue
Now we have a virtio detach API (in commit f9bfbebf34eab707b065116cdc9699d25ba4252a), 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>
Diffstat (limited to 'drivers/net/virtio_net.c')
-rw-r--r--drivers/net/virtio_net.c26
1 files changed, 8 insertions, 18 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 4c347a3..ce35b42 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -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 @@ again:
}
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");
@@ -1019,6 +1003,12 @@ 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)
break;
@@ -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);
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