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xen-netback: immediately wake tx queue when guest rx queue has space

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When an skb is removed from the guest rx queue, immediately wake the
tx queue, instead of after processing them.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[re-based]
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Vrabel 2016-10-04 10:29:15 +01:00 committed by David S. Miller
parent eb1723a29b
commit 7c0b1a23e6
1 changed files with 8 additions and 16 deletions
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24
drivers/net/xen-netback/rx.c
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@ -92,27 +92,21 @@ static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue)
spin_lock_irq(&queue->rx_queue.lock);
skb = __skb_dequeue(&queue->rx_queue);
if (skb)
if (skb) {
queue->rx_queue_len -= skb->len;
if (queue->rx_queue_len < queue->rx_queue_max) {
struct netdev_queue *txq;
txq = netdev_get_tx_queue(queue->vif->dev, queue->id);
netif_tx_wake_queue(txq);
}
}
spin_unlock_irq(&queue->rx_queue.lock);
return skb;
}
static void xenvif_rx_queue_maybe_wake(struct xenvif_queue *queue)
{
spin_lock_irq(&queue->rx_queue.lock);
if (queue->rx_queue_len < queue->rx_queue_max) {
struct net_device *dev = queue->vif->dev;
netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
}
spin_unlock_irq(&queue->rx_queue.lock);
}
static void xenvif_rx_queue_purge(struct xenvif_queue *queue)
{
struct sk_buff *skb;
@ -585,8 +579,6 @@ int xenvif_kthread_guest_rx(void *data)
*/
xenvif_rx_queue_drop_expired(queue);
xenvif_rx_queue_maybe_wake(queue);
cond_resched();
}