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sky2: edge triggered workaround enhancement 

Need to make the edge-triggered workaround timer faster to get marginally
better peformance. The test_and_set_bit in schedule_prep() acts as a barrier
already. Make it a module parameter so that laptops who are concerned
about power can set it to 0; and user's stuck with broken BIOS's
can turn the driver into pure polling.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
This commit is contained in:
Stephen Hemminger 2006-05-08 15:11:30 -07:00
parent cb5d954730
commit 01bd75645f
1 changed files with 12 additions and 8 deletions
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20
drivers/net/sky2.c
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@ -98,6 +98,10 @@ static int disable_msi = 0;
module_param(disable_msi, int, 0); module_param(disable_msi, int, 0);
MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)"); MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
static int idle_timeout = 100;
module_param(idle_timeout, int, 0);
MODULE_PARM_DESC(idle_timeout, "Idle timeout workaround for lost interrupts (ms)");
static const struct pci_device_id sky2_id_table[] = { static const struct pci_device_id sky2_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) }, { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) },
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) }, { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) },
@ -2092,12 +2096,13 @@ static void sky2_descriptor_error(struct sky2_hw *hw, unsigned port,
*/ */
static void sky2_idle(unsigned long arg) static void sky2_idle(unsigned long arg)
{ {
struct net_device *dev = (struct net_device *) arg; struct sky2_hw *hw = (struct sky2_hw *) arg;
struct net_device *dev = hw->dev[0];
local_irq_disable();
if (__netif_rx_schedule_prep(dev)) if (__netif_rx_schedule_prep(dev))
__netif_rx_schedule(dev); __netif_rx_schedule(dev);
local_irq_enable();
mod_timer(&hw->idle_timer, jiffies + msecs_to_jiffies(idle_timeout));
} }
@ -2145,8 +2150,6 @@ static int sky2_poll(struct net_device *dev0, int *budget)
if (work_done >= work_limit) if (work_done >= work_limit)
return 1; return 1;
mod_timer(&hw->idle_timer, jiffies + HZ);
netif_rx_complete(dev0); netif_rx_complete(dev0);
status = sky2_read32(hw, B0_Y2_SP_LISR); status = sky2_read32(hw, B0_Y2_SP_LISR);
@ -2167,8 +2170,6 @@ static irqreturn_t sky2_intr(int irq, void *dev_id, struct pt_regs *regs)
prefetch(&hw->st_le[hw->st_idx]); prefetch(&hw->st_le[hw->st_idx]);
if (likely(__netif_rx_schedule_prep(dev0))) if (likely(__netif_rx_schedule_prep(dev0)))
__netif_rx_schedule(dev0); __netif_rx_schedule(dev0);
else
printk(KERN_DEBUG PFX "irq race detected\n");
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -3290,7 +3291,10 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
sky2_write32(hw, B0_IMSK, Y2_IS_BASE); sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
setup_timer(&hw->idle_timer, sky2_idle, (unsigned long) dev); setup_timer(&hw->idle_timer, sky2_idle, (unsigned long) hw);
if (idle_timeout > 0)
mod_timer(&hw->idle_timer,
jiffies + msecs_to_jiffies(idle_timeout));
pci_set_drvdata(pdev, hw); pci_set_drvdata(pdev, hw);