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authorStephen Hemminger <shemminger@osdl.org>2005-11-08 10:33:44 -0800
committerJeff Garzik <jgarzik@pobox.com>2005-11-08 23:58:08 -0500
commit1631aef15193ef8a199982fa3d45db4d07786d7f (patch)
tree7f000cf60191805de8faa54fbf51f02c30abf0c3 /drivers/net/skge.c
parent355ec57243574c439a4b731fc83af6165ec2f1ec (diff)
downloadop-kernel-dev-1631aef15193ef8a199982fa3d45db4d07786d7f.zip
op-kernel-dev-1631aef15193ef8a199982fa3d45db4d07786d7f.tar.gz
[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 ea68d4d..389d0be 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)
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)
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