ixgbe: priority tagging FCoE frames without FCoE offload

The DCB user priority for FCoE is available regardless of whether
FCoE offload is enabled (IXGBE_FLAG_FCOE_ENABLED bit is set).
This allows proper DCB user priority tagging for FCoE
traffic on both 82598 and 82599 devices.
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_main.c

@@ -4783,6 +4783,7 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
 #ifdef CONFIG_IXGBE_DCB
 		/* Default traffic class to use for FCoE */
 		adapter->fcoe.tc = IXGBE_FCOE_DEFTC;
+		adapter->fcoe.up = IXGBE_FCOE_DEFTC;
 #endif
 #endif /* IXGBE_FCOE */
 	}
@@ -6147,21 +6148,26 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
 	struct ixgbe_adapter *adapter = netdev_priv(dev);
 	int txq = smp_processor_id();
 
-	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
-		while (unlikely(txq >= dev->real_num_tx_queues))
-			txq -= dev->real_num_tx_queues;
-		return txq;
-	}
-
 #ifdef IXGBE_FCOE
-	if ((adapter->flags & IXGBE_FLAG_FCOE_ENABLED) &&
-	    ((skb->protocol == htons(ETH_P_FCOE)) ||
-	     (skb->protocol == htons(ETH_P_FIP)))) {
+	if ((skb->protocol == htons(ETH_P_FCOE)) ||
+	    (skb->protocol == htons(ETH_P_FIP))) {
+		if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
 			txq &= (adapter->ring_feature[RING_F_FCOE].indices - 1);
 			txq += adapter->ring_feature[RING_F_FCOE].mask;
 			return txq;
+		} else if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+			txq = adapter->fcoe.up;
+			return txq;
+		}
 	}
 #endif
+
+	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
+		while (unlikely(txq >= dev->real_num_tx_queues))
+			txq -= dev->real_num_tx_queues;
+		return txq;
+	}
+
 	if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
 		if (skb->priority == TC_PRIO_CONTROL)
 			txq = adapter->ring_feature[RING_F_DCB].indices-1;
@@ -6205,18 +6211,15 @@ static netdev_tx_t ixgbe_xmit_frame(struct sk_buff *skb,
 	tx_ring = adapter->tx_ring[skb->queue_mapping];
 
 #ifdef IXGBE_FCOE
-	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
-#ifdef CONFIG_IXGBE_DCB
 	/* for FCoE with DCB, we force the priority to what
 	 * was specified by the switch */
-		if ((skb->protocol == htons(ETH_P_FCOE)) ||
-		    (skb->protocol == htons(ETH_P_FIP))) {
+	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);
-		}
-#endif
 		/* flag for FCoE offloads */
 		if (skb->protocol == htons(ETH_P_FCOE))
 			tx_flags |= IXGBE_TX_FLAGS_FCOE;