e1000e: Program the correct register for ITR when using MSI-X.

When configuring interrupt throttling on 82574 in MSI-X mode, we need to
be programming the EITR registers instead of the ITR register.

-rc2: Renamed e1000_write_itr() to e1000e_write_itr(), fixed whitespace
      issues, and removed unnecessary !! operation.
-rc3: Reduced the scope of the loop variable in e1000e_write_itr().

Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 905e2147d918..105d554ea9db 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -1897,7 +1897,6 @@ static int e1000_set_coalesce(struct net_device *netdev,
                               struct ethtool_coalesce *ec)
 {
         struct e1000_adapter *adapter = netdev_priv(netdev);
-        struct e1000_hw *hw = &adapter->hw;
 
         if ((ec->rx_coalesce_usecs > E1000_MAX_ITR_USECS) ||
             ((ec->rx_coalesce_usecs > 4) &&
@@ -1916,9 +1915,9 @@ static int e1000_set_coalesce(struct net_device *netdev,
         }
 
         if (adapter->itr_setting != 0)
-                ew32(ITR, 1000000000 / (adapter->itr * 256));
+                e1000e_write_itr(adapter, adapter->itr);
         else
-                ew32(ITR, 0);
+                e1000e_write_itr(adapter, 0);
 
         return 0;
 }