ixgbe: fix build error with FCOE_CONFIG without DCB_CONFIG

Building ixgbe without DCB_CONFIG and FCOE_CONFIG will cause
a build error.  This resolves the build error by wrapping
the fcoe.up in CONFIG_IXGBE_DCB ifdefs.

Also frames were being priority VLAN tagged even without DCB
enabled.  This fixes this so that 8021Q priority tags are
only added with DCB actually enabled.
Reported-by: Ndivya <dipraksh@linux.vnet.ibm.com>
Reported-by: NJon Mason <jon.mason@exar.com>
Signed-off-by: NJohn Fastabend <john.r.fastabend@intel.com>
Tested-by: NStephen Ko <stephen.s.ko@intel.com>
Tested-by: NRoss Brattain <ross.b.brattain@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

@@ -6155,9 +6155,11 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
 			txq &= (adapter->ring_feature[RING_F_FCOE].indices - 1);
 			txq += adapter->ring_feature[RING_F_FCOE].mask;
 			return txq;
+#ifdef CONFIG_IXGBE_DCB
 		} else if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
 			txq = adapter->fcoe.up;
 			return txq;
+#endif
 		}
 	}
 #endif
@@ -6216,10 +6218,14 @@ static netdev_tx_t ixgbe_xmit_frame(struct sk_buff *skb,
 	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED &&
 	    (skb->protocol == htons(ETH_P_FCOE) ||
 	     skb->protocol == htons(ETH_P_FIP))) {
-		tx_flags &= ~(IXGBE_TX_FLAGS_VLAN_PRIO_MASK
-			      << IXGBE_TX_FLAGS_VLAN_SHIFT);
-		tx_flags |= ((adapter->fcoe.up << 13)
-			      << IXGBE_TX_FLAGS_VLAN_SHIFT);
+#ifdef CONFIG_IXGBE_DCB
+		if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+			tx_flags &= ~(IXGBE_TX_FLAGS_VLAN_PRIO_MASK
+				      << IXGBE_TX_FLAGS_VLAN_SHIFT);
+			tx_flags |= ((adapter->fcoe.up << 13)
+				      << IXGBE_TX_FLAGS_VLAN_SHIFT);
+		}
+#endif
 		/* flag for FCoE offloads */
 		if (skb->protocol == htons(ETH_P_FCOE))
 			tx_flags |= IXGBE_TX_FLAGS_FCOE;