The patch titled
sky2: only bring up watchdog if link is active
has been added to the -mm tree. Its filename is
sky2-only-bring-up-watchdog-if-link-is-active.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: sky2: only bring up watchdog if link is active
From: Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/net/sky2.c | 55 +++++++++++++++++++------------------------
drivers/net/sky2.h | 3 +-
2 files changed, 27 insertions(+), 31 deletions(-)
diff -puN drivers/net/sky2.c~sky2-only-bring-up-watchdog-if-link-is-active drivers/net/sky2.c
--- a/drivers/net/sky2.c~sky2-only-bring-up-watchdog-if-link-is-active
+++ a/drivers/net/sky2.c
@@ -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 *
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_por
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_p
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
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];
+
+ 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_str
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_str
}
}
- sky2_idle_start(hw);
-
rtnl_unlock();
}
@@ -4030,11 +4029,9 @@ static int __devinit sky2_probe(struct p
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
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 *
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 *p
}
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
if (!hw)
return;
- del_timer_sync(&hw->idle_timer);
netif_poll_disable(hw->dev[0]);
for (i = 0; i < hw->ports; i++) {
diff -puN drivers/net/sky2.h~sky2-only-bring-up-watchdog-if-link-is-active drivers/net/sky2.h
--- a/drivers/net/sky2.h~sky2-only-bring-up-watchdog-if-link-is-active
+++ a/drivers/net/sky2.h
@@ -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;
_
Patches currently in -mm which might be from shemminger@xxxxxxxxxxxxxxxxxxxx are
origin.patch
pci-x-pci-express-read-control-interfaces-mthca.patch
pci-x-pci-express-read-control-interfaces-myrinet.patch
pci-x-pci-express-read-control-interfaces-e1000.patch
sky2-clear-pci-power-control-reg-at-startup.patch
sky2-only-bring-up-watchdog-if-link-is-active.patch
sky2-117.patch
git-net.patch
i386-optimize-memset-of-6-and-8-bytes.patch
-
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