bnx2x: Take the distribution range definition out of skb_tx_hash()

Move the calcualation of the Tx hash for a given hash range into a separate
function and define the skb_tx_hash(), which calculates a Tx hash for a
[0; dev->real_num_tx_queues - 1] hash values range, using this
function (__skb_tx_hash()).

Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 19f37a6..4c4bec6 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2165,8 +2165,9 @@
 	return skb->queue_mapping != 0;
 }
 
-extern u16 skb_tx_hash(const struct net_device *dev,
-		       const struct sk_buff *skb);
+extern u16 __skb_tx_hash(const struct net_device *dev,
+			 const struct sk_buff *skb,
+			 unsigned int num_tx_queues);
 
 #ifdef CONFIG_XFRM
 static inline struct sec_path *skb_sec_path(struct sk_buff *skb)