AuxXxilium/linux_dsm_epyc7002
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e1000e: Do not read ICR in Other interrupt

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Removes the ICR read in the other interrupt handler, uses EIAC to
autoclear the Other bit from ICR and IMS. This allows us to avoid
interference with Rx and Tx interrupts in the Other interrupt handler.

The information read from ICR is not needed. IMS is configured such that
the only interrupt cause that can trigger the Other interrupt is Link
Status Change.

Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Benjamin Poirier 2015-11-09 15:50:19 -08:00 committed by Jeff Kirsher
parent 4d432f67ff
commit 16ecba59bc
1 changed files with 7 additions and 15 deletions
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22
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -1905,23 +1905,14 @@ static irqreturn_t e1000_msix_other(int __always_unused irq, void *data)
struct net_device *netdev = data;
struct e1000_adapter *adapter = netdev_priv(netdev);
struct e1000_hw *hw = &adapter->hw;
u32 icr = er32(ICR);
if (icr & adapter->eiac_mask)
ew32(ICS, (icr & adapter->eiac_mask));
if (icr & E1000_ICR_OTHER) {
if (!(icr & E1000_ICR_LSC))
goto no_link_interrupt;
hw->mac.get_link_status = true;
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->state))
mod_timer(&adapter->watchdog_timer, jiffies + 1);
}
no_link_interrupt:
if (!test_bit(__E1000_DOWN, &adapter->state))
ew32(IMS, E1000_IMS_LSC | E1000_IMS_OTHER);
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->state)) {
mod_timer(&adapter->watchdog_timer, jiffies + 1);
ew32(IMS, E1000_IMS_OTHER);
}
return IRQ_HANDLED;
}
@ -2021,6 +2012,7 @@ static void e1000_configure_msix(struct e1000_adapter *adapter)
hw->hw_addr + E1000_EITR_82574(vector));
else
writel(1, hw->hw_addr + E1000_EITR_82574(vector));
adapter->eiac_mask |= E1000_IMS_OTHER;
/* Cause Tx interrupts on every write back */
ivar |= (1 << 31);
@ -2249,7 +2241,7 @@ static void e1000_irq_enable(struct e1000_adapter *adapter)
if (adapter->msix_entries) {
ew32(EIAC_82574, adapter->eiac_mask & E1000_EIAC_MASK_82574);
ew32(IMS, adapter->eiac_mask | E1000_IMS_OTHER | E1000_IMS_LSC);
ew32(IMS, adapter->eiac_mask | E1000_IMS_LSC);
} else if ((hw->mac.type == e1000_pch_lpt) ||
(hw->mac.type == e1000_pch_spt)) {
ew32(IMS, IMS_ENABLE_MASK | E1000_IMS_ECCER);