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>

1 files changed, 10 insertions, 5 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index d28b3a023bb2..b25dd087f06a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2112,14 +2112,19 @@ out:
 
 static u32 hashrnd __read_mostly;
 
-u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
+/*
+ * Returns a Tx hash based on the given packet descriptor a Tx queues' number
+ * to be used as a distribution range.
+ */
+u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
+                  unsigned int num_tx_queues)
 {
         u32 hash;
 
         if (skb_rx_queue_recorded(skb)) {
                 hash = skb_get_rx_queue(skb);
-                while (unlikely(hash >= dev->real_num_tx_queues))
-                        hash -= dev->real_num_tx_queues;
+                while (unlikely(hash >= num_tx_queues))
+                        hash -= num_tx_queues;
                 return hash;
         }
 
@@ -2129,9 +2134,9 @@ u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
                 hash = (__force u16) skb->protocol ^ skb->rxhash;
         hash = jhash_1word(hash, hashrnd);
 
-        return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
+        return (u16) (((u64) hash * num_tx_queues) >> 32);
 }
-EXPORT_SYMBOL(skb_tx_hash);
+EXPORT_SYMBOL(__skb_tx_hash);
 
 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
 {