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authorStephen Hemminger <shemminger@osdl.org>2005-11-08 13:33:44 -0500
committerJeff Garzik <jgarzik@pobox.com>2005-11-08 23:58:08 -0500
commit1631aef15193ef8a199982fa3d45db4d07786d7f (patch)
tree7f000cf60191805de8faa54fbf51f02c30abf0c3 /drivers/net/skge.c
parent355ec57243574c439a4b731fc83af6165ec2f1ec (diff)
[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>
Diffstat (limited to 'drivers/net/skge.c')
-rw-r--r--drivers/net/skge.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index ea68d4d3d57..389d0be3586 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -2627,7 +2627,7 @@ static int skge_poll(struct net_device *dev, int *budget)
2627 unsigned int to_do = min(dev->quota, *budget); 2627 unsigned int to_do = min(dev->quota, *budget);
2628 unsigned int work_done = 0; 2628 unsigned int work_done = 0;
2629 2629
2630 for (e = ring->to_clean; work_done < to_do; e = e->next) { 2630 for (e = ring->to_clean; prefetch(e->next), work_done < to_do; e = e->next) {
2631 struct skge_rx_desc *rd = e->desc; 2631 struct skge_rx_desc *rd = e->desc;
2632 struct sk_buff *skb; 2632 struct sk_buff *skb;
2633 u32 control; 2633 u32 control;
@@ -2660,11 +2660,11 @@ static int skge_poll(struct net_device *dev, int *budget)
2660 if (work_done >= to_do) 2660 if (work_done >= to_do)
2661 return 1; /* not done */ 2661 return 1; /* not done */
2662 2662
2663 local_irq_disable(); 2663 netif_rx_complete(dev);
2664 __netif_rx_complete(dev);
2665 hw->intr_mask |= portirqmask[skge->port]; 2664 hw->intr_mask |= portirqmask[skge->port];
2666 skge_write32(hw, B0_IMSK, hw->intr_mask); 2665 skge_write32(hw, B0_IMSK, hw->intr_mask);
2667 local_irq_enable(); 2666 skge_read32(hw, B0_IMSK);
2667
2668 return 0; 2668 return 0;
2669} 2669}
2670 2670
@@ -2676,7 +2676,7 @@ static inline void skge_tx_intr(struct net_device *dev)
2676 struct skge_element *e; 2676 struct skge_element *e;
2677 2677
2678 spin_lock(&skge->tx_lock); 2678 spin_lock(&skge->tx_lock);
2679 for (e = ring->to_clean; e != ring->to_use; e = e->next) { 2679 for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
2680 struct skge_tx_desc *td = e->desc; 2680 struct skge_tx_desc *td = e->desc;
2681 u32 control; 2681 u32 control;
2682 2682
@@ -2829,6 +2829,14 @@ static void skge_extirq(unsigned long data)
2829 local_irq_enable(); 2829 local_irq_enable();
2830} 2830}
2831 2831
2832static inline void skge_wakeup(struct net_device *dev)
2833{
2834 struct skge_port *skge = netdev_priv(dev);
2835
2836 prefetch(skge->rx_ring.to_clean);
2837 netif_rx_schedule(dev);
2838}
2839
2832static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs) 2840static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
2833{ 2841{
2834 struct skge_hw *hw = dev_id; 2842 struct skge_hw *hw = dev_id;
@@ -2840,12 +2848,12 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
2840 status &= hw->intr_mask; 2848 status &= hw->intr_mask;
2841 if (status & IS_R1_F) { 2849 if (status & IS_R1_F) {
2842 hw->intr_mask &= ~IS_R1_F; 2850 hw->intr_mask &= ~IS_R1_F;
2843 netif_rx_schedule(hw->dev[0]); 2851 skge_wakeup(hw->dev[0]);
2844 } 2852 }
2845 2853
2846 if (status & IS_R2_F) { 2854 if (status & IS_R2_F) {
2847 hw->intr_mask &= ~IS_R2_F; 2855 hw->intr_mask &= ~IS_R2_F;
2848 netif_rx_schedule(hw->dev[1]); 2856 skge_wakeup(hw->dev[1]);
2849 } 2857 }
2850 2858
2851 if (status & IS_XA1_F) 2859 if (status & IS_XA1_F)