s390/qeth: pass proto to qeth_l3_get_cast_type()

qeth_l3_hard_start_xmit() already determined the skb's proto. Avoid
doing so a second time when it calls qeth_l3_get_cast_type().
Signed-off-by: NJulian Wiedmann <jwi@linux.ibm.com>
Acked-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/s390/net/qeth_l3_main.c

@@ -1610,9 +1610,8 @@ static int qeth_l3_get_cast_type_rcu(struct sk_buff *skb, struct dst_entry *dst,
 	}
 }
 
-static int qeth_l3_get_cast_type(struct sk_buff *skb)
+static int qeth_l3_get_cast_type(struct sk_buff *skb, __be16 proto)
 {
-	__be16 proto = vlan_get_protocol(skb);
 	struct dst_entry *dst;
 	int cast_type;
 
@@ -1771,7 +1770,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
 	}
 
 	if (!(dev->flags & IFF_BROADCAST) &&
-	    qeth_l3_get_cast_type(skb) == RTN_BROADCAST)
+	    qeth_l3_get_cast_type(skb, proto) == RTN_BROADCAST)
 		goto tx_drop;
 
 	if (proto == htons(ETH_P_IP) || IS_IQD(card))
@@ -1831,8 +1830,10 @@ static netdev_features_t qeth_l3_osa_features_check(struct sk_buff *skb,
 static u16 qeth_l3_iqd_select_queue(struct net_device *dev, struct sk_buff *skb,
 				    struct net_device *sb_dev)
 {
-	return qeth_iqd_select_queue(dev, skb, qeth_l3_get_cast_type(skb),
-				     sb_dev);
+	__be16 proto = vlan_get_protocol(skb);
+
+	return qeth_iqd_select_queue(dev, skb,
+				     qeth_l3_get_cast_type(skb, proto), sb_dev);
 }
 
 static u16 qeth_l3_osa_select_queue(struct net_device *dev, struct sk_buff *skb,