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Commit 7c0b1a23 authored by David Vrabel's avatar David Vrabel Committed by David S. Miller
Browse files

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



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

Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
[re-based]
Signed-off-by: default avatarPaul Durrant <paul.durrant@citrix.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eb1723a2

drivers/net/xen-netback/rx.c

+8 −16
Original line number Diff line number Diff line
@@ -92,25 +92,19 @@ 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;



	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;

			struct netdev_queue *txq;



		netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));

			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_purge(struct xenvif_queue *queue)
@@ -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();

	}