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sky2: only bring up watchdog if link is active

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This fixes the extra timer overhead that people were whining about
as a 2.6.23 regression.

Running the watchdog timer all the time is unneeded. Change it
to run only if link is up, and reduce frequency to save power.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2007-08-21 14:34:03 -07:00 committed by Jeff Garzik
parent b23457737f
commit 32c2c30085
2 changed files with 27 additions and 31 deletions
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55
drivers/net/sky2.c
View file

@ -99,10 +99,6 @@ static int disable_msi = 0;
module_param(disable_msi, int, 0);
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, "Watchdog timer for lost interrupts (ms)");
static const struct pci_device_id sky2_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) }, /* SK-9Sxx */
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) }, /* SK-9Exx */
@ -1624,6 +1620,9 @@ static int sky2_down(struct net_device *dev)
if (netif_msg_ifdown(sky2))
printk(KERN_INFO PFX "%s: disabling interface\n", dev->name);
if (netif_carrier_ok(dev) && --hw->active == 0)
del_timer(&hw->watchdog_timer);
/* Stop more packets from being queued */
netif_stop_queue(dev);
@ -1744,6 +1743,10 @@ static void sky2_link_up(struct sky2_port *sky2)
netif_carrier_on(sky2->netdev);
if (hw->active++ == 0)
mod_timer(&hw->watchdog_timer, jiffies + 1);
/* Turn on link LED */
sky2_write8(hw, SK_REG(port, LNK_LED_REG),
LINKLED_ON | LINKLED_BLINK_OFF | LINKLED_LINKSYNC_OFF);
@ -1795,6 +1798,11 @@ static void sky2_link_down(struct sky2_port *sky2)
netif_carrier_off(sky2->netdev);
/* Stop watchdog if both ports are not active */
if (--hw->active == 0)
del_timer(&hw->watchdog_timer);
/* Turn on link LED */
sky2_write8(hw, SK_REG(port, LNK_LED_REG), LINKLED_OFF);
@ -2426,25 +2434,20 @@ static void sky2_le_error(struct sky2_hw *hw, unsigned port,
sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_CLR_IRQ_CHK);
}
/* If idle then force a fake soft NAPI poll once a second
* to work around cases where sharing an edge triggered interrupt.
*/
static inline void sky2_idle_start(struct sky2_hw *hw)
{
if (idle_timeout > 0)
mod_timer(&hw->idle_timer,
jiffies + msecs_to_jiffies(idle_timeout));
}
static void sky2_idle(unsigned long arg)
/* Check for lost IRQ once a second */
static void sky2_watchdog(unsigned long arg)
{
struct sky2_hw *hw = (struct sky2_hw *) arg;
struct net_device *dev = hw->dev[0];
if (__netif_rx_schedule_prep(dev))
__netif_rx_schedule(dev);
if (sky2_read32(hw, B0_ISRC)) {
struct net_device *dev = hw->dev[0];
mod_timer(&hw->idle_timer, jiffies + msecs_to_jiffies(idle_timeout));
if (__netif_rx_schedule_prep(dev))
__netif_rx_schedule(dev);
}
if (hw->active > 0)
mod_timer(&hw->watchdog_timer, round_jiffies(jiffies + HZ));
}
/* Hardware/software error handling */
@ -2732,8 +2735,6 @@ static void sky2_restart(struct work_struct *work)
struct net_device *dev;
int i, err;
del_timer_sync(&hw->idle_timer);
rtnl_lock();
sky2_write32(hw, B0_IMSK, 0);
sky2_read32(hw, B0_IMSK);
@ -2762,8 +2763,6 @@ static void sky2_restart(struct work_struct *work)
}
}
sky2_idle_start(hw);
rtnl_unlock();
}
@ -4030,11 +4029,9 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
sky2_show_addr(dev1);
}
setup_timer(&hw->idle_timer, sky2_idle, (unsigned long) hw);
setup_timer(&hw->watchdog_timer, sky2_watchdog, (unsigned long) hw);
INIT_WORK(&hw->restart_work, sky2_restart);
sky2_idle_start(hw);
pci_set_drvdata(pdev, hw);
return 0;
@ -4069,7 +4066,7 @@ static void __devexit sky2_remove(struct pci_dev *pdev)
if (!hw)
return;
del_timer_sync(&hw->idle_timer);
del_timer_sync(&hw->watchdog_timer);
flush_scheduled_work();
@ -4113,7 +4110,6 @@ static int sky2_suspend(struct pci_dev *pdev, pm_message_t state)
if (!hw)
return 0;
del_timer_sync(&hw->idle_timer);
netif_poll_disable(hw->dev[0]);
for (i = 0; i < hw->ports; i++) {
@ -4179,7 +4175,7 @@ static int sky2_resume(struct pci_dev *pdev)
}
netif_poll_enable(hw->dev[0]);
sky2_idle_start(hw);
return 0;
out:
dev_err(&pdev->dev, "resume failed (%d)\n", err);
@ -4196,7 +4192,6 @@ static void sky2_shutdown(struct pci_dev *pdev)
if (!hw)
return;
del_timer_sync(&hw->idle_timer);
netif_poll_disable(hw->dev[0]);
for (i = 0; i < hw->ports; i++) {

3
drivers/net/sky2.h
View file

@ -2045,12 +2045,13 @@ struct sky2_hw {
u8 chip_rev;
u8 pmd_type;
u8 ports;
u8 active;
struct sky2_status_le *st_le;
u32 st_idx;
dma_addr_t st_dma;
struct timer_list idle_timer;
struct timer_list watchdog_timer;
struct work_struct restart_work;
int msi;
wait_queue_head_t msi_wait;