igb: only support SRRCTL_DROP_EN when using multiple queues
The SRRCTL.DROP_EN bit should only be set when we are supporting multiple queues. This bit is meant to prevent head of line blocking and is unnecessary in the single queue case. Signed-off-by: NNicholas Nunley <nicholasx.d.nunley@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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