ixgbe: Always tag VLAN tagged packets

This change is meant to fix the patch:
	ixgbe: Cleanup FCOE and VLAN handling in xmit_frame_ring
And can be rolled into it if needed.

What this fixes is that VLAN tagged packets were not being tagged if they
were prio 7 which matches up with TC_PRIO_CONTROL.  In order to fix it I am
just setting things up so that we always tag VLAN tagged packets.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -6762,7 +6762,8 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
 	}
 
 	if ((adapter->flags & IXGBE_FLAG_DCB_ENABLED) &&
-	    skb->priority != TC_PRIO_CONTROL) {
+	    ((tx_flags & (IXGBE_TX_FLAGS_HW_VLAN | IXGBE_TX_FLAGS_SW_VLAN)) ||
+	     (skb->priority != TC_PRIO_CONTROL))) {
 		tx_flags &= ~IXGBE_TX_FLAGS_VLAN_PRIO_MASK;
 		tx_flags |= tx_ring->dcb_tc <<
 			    IXGBE_TX_FLAGS_VLAN_PRIO_SHIFT;