ixgbe: use EIAM to automask MSI-X
when disabling interrupts, driver was writing with IO, this is no necessary because on ixgbe parts the hardware can "oneshot" disable and clear the interrupt. So on 82598/82599 use of EIAM should avoid one posted write per interrupt when in MSI-X mode. This should improve performance and seems to in my limited testing, reduce CPU utilization VERY slightly. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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