ixgbe: Disable DROP_EN for Rx queues

82599 mistakenly enabled drop on Rx queues in the packet buffer.  The
default mode should be store-and-forward from the FIFO.
Signed-off-by: NPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Acked-by: NMallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_main.c

@@ -1679,8 +1679,6 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter, int index)
 			srrctl |= rx_ring->rx_buf_len >>
 			          IXGBE_SRRCTL_BSIZEPKT_SHIFT;
 	}
-	if (adapter->hw.mac.type == ixgbe_mac_82599EB)
-		srrctl |= IXGBE_SRRCTL_DROP_EN;
 
 	IXGBE_WRITE_REG(&adapter->hw, IXGBE_SRRCTL(index), srrctl);
 }