net: Call skb_get_hash in get_xps_queue and __skb_tx_hash

Call standard function to get a packet hash instead of taking this from
skb->sk->sk_hash or only using skb->protocol.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 7 insertions, 26 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 66f9a04ec270..8b43a28ee0bc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2486,7 +2486,7 @@ static inline int netif_set_xps_queue(struct net_device *dev,
  * as a distribution range limit for the returned value.
  */
 static inline u16 skb_tx_hash(const struct net_device *dev,
-                              const struct sk_buff *skb)
+                              struct sk_buff *skb)
 {
         return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
 }
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ec89301ada41..b297af70ac30 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3005,7 +3005,7 @@ static inline bool skb_rx_queue_recorded(const struct sk_buff *skb)
         return skb->queue_mapping != 0;
 }
 
-u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
+u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
                   unsigned int num_tx_queues);
 
 static inline struct sec_path *skb_sec_path(struct sk_buff *skb)
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 2ff8cd4dfc5f..62d1cb624f53 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -196,12 +196,6 @@ static __always_inline u32 __flow_hash_3words(u32 a, u32 b, u32 c)
         return jhash_3words(a, b, c, hashrnd);
 }
 
-static __always_inline u32 __flow_hash_1word(u32 a)
-{
-        __flow_hash_secret_init();
-        return jhash_1word(a, hashrnd);
-}
-
 static inline u32 __flow_hash_from_keys(struct flow_keys *keys)
 {
         u32 hash;
@@ -253,7 +247,7 @@ EXPORT_SYMBOL(__skb_get_hash);
  * 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,
+u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
                   unsigned int num_tx_queues)
 {
         u32 hash;
@@ -273,13 +267,7 @@ u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
                 qcount = dev->tc_to_txq[tc].count;
         }
 
-        if (skb->sk && skb->sk->sk_hash)
-                hash = skb->sk->sk_hash;
-        else
-                hash = (__force u16) skb->protocol;
-        hash = __flow_hash_1word(hash);
-
-        return (u16) (((u64) hash * qcount) >> 32) + qoffset;
+        return (u16) (((u64)skb_get_hash(skb) * qcount) >> 32) + qoffset;
 }
 EXPORT_SYMBOL(__skb_tx_hash);
 
@@ -351,17 +339,10 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
                 if (map) {
                         if (map->len == 1)
                                 queue_index = map->queues[0];
-                        else {
-                                u32 hash;
-                                if (skb->sk && skb->sk->sk_hash)
-                                        hash = skb->sk->sk_hash;
-                                else
-                                        hash = (__force u16) skb->protocol ^
-                                            skb->hash;
-                                hash = __flow_hash_1word(hash);
+                        else
                                 queue_index = map->queues[
-                                    ((u64)hash * map->len) >> 32];
-                        }
+                                    ((u64)skb_get_hash(skb) * map->len) >> 32];
+
                         if (unlikely(queue_index >= dev->real_num_tx_queues))
                                 queue_index = -1;
                 }