net: Add utility function to copy skb hash

Adds skb_copy_hash to copy rxhash and l4_rxhash from one skb to another.

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

2 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 99846956dff9..06bedeb0d49e 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -764,6 +764,12 @@ static inline void skb_clear_hash_if_not_l4(struct sk_buff *skb)
                 skb_clear_hash(skb);
 }
 
+static inline void skb_copy_hash(struct sk_buff *to, const struct sk_buff *from)
+{
+        to->rxhash = from->rxhash;
+        to->l4_rxhash = from->l4_rxhash;
+};
+
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
 static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
 {
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 06e72d3cdf60..2b6b863f51f2 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -712,9 +712,8 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
         new->inner_network_header = old->inner_network_header;
         new->inner_mac_header = old->inner_mac_header;
         skb_dst_copy(new, old);
-        new->rxhash             = old->rxhash;
+        skb_copy_hash(new, old);
         new->ooo_okay           = old->ooo_okay;
-        new->l4_rxhash          = old->l4_rxhash;
         new->no_fcs             = old->no_fcs;
         new->encapsulation      = old->encapsulation;
 #ifdef CONFIG_XFRM