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Commit 1631aef1 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[PATCH] skge: use prefetch on receive 



Use prefetch() in the interrupt path to try and look ahead
at the next place will be looking at in the ring.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 355ec572

drivers/net/skge.c

+15 −7
Original line number Diff line number Diff line
@@ -2627,7 +2627,7 @@ static int skge_poll(struct net_device *dev, int *budget) 
	unsigned int to_do = min(dev->quota, *budget);

	unsigned int work_done = 0;



	for (e = ring->to_clean; work_done < to_do; e = e->next) {

	for (e = ring->to_clean; prefetch(e->next), work_done < to_do; e = e->next) {

		struct skge_rx_desc *rd = e->desc;

		struct sk_buff *skb;

		u32 control;
@@ -2660,11 +2660,11 @@ static int skge_poll(struct net_device *dev, int *budget) 
	if (work_done >=  to_do)

		return 1; /* not done */



	local_irq_disable();

	__netif_rx_complete(dev);

	netif_rx_complete(dev);

	hw->intr_mask |= portirqmask[skge->port];

	skge_write32(hw, B0_IMSK, hw->intr_mask);

	local_irq_enable();

	skge_read32(hw, B0_IMSK);



	return 0;

}
@@ -2676,7 +2676,7 @@ static inline void skge_tx_intr(struct net_device *dev) 
	struct skge_element *e;



	spin_lock(&skge->tx_lock);

	for (e = ring->to_clean; e != ring->to_use; e = e->next) {

	for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {

		struct skge_tx_desc *td = e->desc;

		u32 control;
@@ -2829,6 +2829,14 @@ static void skge_extirq(unsigned long data) 
	local_irq_enable();

}



static inline void skge_wakeup(struct net_device *dev)

{

	struct skge_port *skge = netdev_priv(dev);



	prefetch(skge->rx_ring.to_clean);

	netif_rx_schedule(dev);

}



static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)

{

	struct skge_hw *hw = dev_id;
@@ -2840,12 +2848,12 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs) 
	status &= hw->intr_mask;

	if (status & IS_R1_F) {

		hw->intr_mask &= ~IS_R1_F;

		netif_rx_schedule(hw->dev[0]);

		skge_wakeup(hw->dev[0]);

	}



	if (status & IS_R2_F) {

		hw->intr_mask &= ~IS_R2_F;

		netif_rx_schedule(hw->dev[1]);

		skge_wakeup(hw->dev[1]);

	}



	if (status & IS_XA1_F)