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e1000: Fix MSI only interrupt handler routine 

Unfortunately the read-free MSI interrupt handler needs to flush write
the icr register and thus we can't be read-free. Our MSI irq routine
thus becomes a lot more simpler since we don't need to track link state
anymore.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
This commit is contained in:
Jesse Brandeburg 2007-01-18 09:25:21 -08:00 committed by Jeff Garzik
parent bf3cea4d8a
commit b5fc8f0c43
2 changed files with 19 additions and 42 deletions
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1
drivers/net/e1000/e1000.h
View File

@ -257,7 +257,6 @@ struct e1000_adapter {
spinlock_t tx_queue_lock;
#endif
atomic_t irq_sem;
unsigned int detect_link;
unsigned int total_tx_bytes;
unsigned int total_tx_packets;
unsigned int total_rx_bytes;

60
drivers/net/e1000/e1000_main.c
View File

@ -3765,8 +3765,8 @@ e1000_update_stats(struct e1000_adapter *adapter)
* @data: pointer to a network interface device structure
**/
static
irqreturn_t e1000_intr_msi(int irq, void *data)
static irqreturn_t
e1000_intr_msi(int irq, void *data)
{
struct net_device *netdev = data;
struct e1000_adapter *adapter = netdev_priv(netdev);
@ -3774,49 +3774,27 @@ irqreturn_t e1000_intr_msi(int irq, void *data)
#ifndef CONFIG_E1000_NAPI
int i;
#endif
uint32_t icr = E1000_READ_REG(hw, ICR);
/* this code avoids the read of ICR but has to get 1000 interrupts
* at every link change event before it will notice the change */
if (++adapter->detect_link >= 1000) {
uint32_t icr = E1000_READ_REG(hw, ICR);
#ifdef CONFIG_E1000_NAPI
/* read ICR disables interrupts using IAM, so keep up with our
* enable/disable accounting */
atomic_inc(&adapter->irq_sem);
/* read ICR disables interrupts using IAM, so keep up with our
* enable/disable accounting */
atomic_inc(&adapter->irq_sem);
#endif
adapter->detect_link = 0;
if ((icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) &&
(icr & E1000_ICR_INT_ASSERTED)) {
hw->get_link_status = 1;
/* 80003ES2LAN workaround--
* For packet buffer work-around on link down event;
* disable receives here in the ISR and
* reset adapter in watchdog
*/
if (netif_carrier_ok(netdev) &&
(adapter->hw.mac_type == e1000_80003es2lan)) {
/* disable receives */
uint32_t rctl = E1000_READ_REG(hw, RCTL);
E1000_WRITE_REG(hw, RCTL, rctl & ~E1000_RCTL_EN);
}
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->flags))
mod_timer(&adapter->watchdog_timer,
jiffies + 1);
if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
hw->get_link_status = 1;
/* 80003ES2LAN workaround-- For packet buffer work-around on
* link down event; disable receives here in the ISR and reset
* adapter in watchdog */
if (netif_carrier_ok(netdev) &&
(adapter->hw.mac_type == e1000_80003es2lan)) {
/* disable receives */
uint32_t rctl = E1000_READ_REG(hw, RCTL);
E1000_WRITE_REG(hw, RCTL, rctl & ~E1000_RCTL_EN);
}
} else {
E1000_WRITE_REG(hw, ICR, (0xffffffff & ~(E1000_ICR_RXSEQ |
E1000_ICR_LSC)));
/* bummer we have to flush here, but things break otherwise as
* some event appears to be lost or delayed and throughput
* drops. In almost all tests this flush is un-necessary */
E1000_WRITE_FLUSH(hw);
#ifdef CONFIG_E1000_NAPI
/* Interrupt Auto-Mask (IAM)...upon writing ICR, interrupts are
* masked. No need for the IMC write, but it does mean we
* should account for it ASAP. */
atomic_inc(&adapter->irq_sem);
#endif
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->flags))
mod_timer(&adapter->watchdog_timer, jiffies + 1);
}
#ifdef CONFIG_E1000_NAPI