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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: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
hifive-unleashed-5.1
Stephen Hemminger 2005-11-08 10:33:44 -08:00 committed by Jeff Garzik
parent 355ec57243
commit 1631aef151
1 changed files with 15 additions and 7 deletions
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22
drivers/net/skge.c
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@ -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)