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Commit 32c2c300 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
Browse files

sky2: only bring up watchdog if link is active 



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: default avatarStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent b2345773

drivers/net/sky2.c

+25 −30
Original line number Diff line number Diff line
@@ -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;



	if (sky2_read32(hw, B0_ISRC)) {

		struct net_device *dev = hw->dev[0];



		if (__netif_rx_schedule_prep(dev))

			__netif_rx_schedule(dev);

	}



	mod_timer(&hw->idle_timer, jiffies + msecs_to_jiffies(idle_timeout));

	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++) {

drivers/net/sky2.h

+2 −1
Original line number Diff line number Diff line
@@ -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;