datapath: lisp: Use skb rxhash for source port.

Rather than using complete flow hash, we can use skb->rxhash for
calculating source port. Similar calculation is done by vxlan.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>

diff --git a/datapath/vport-lisp.c b/datapath/vport-lisp.c
index e4e603f..c2698ae 100644 (file)
--- a/datapath/vport-lisp.c
+++ b/datapath/vport-lisp.c
@@ -165,12 +165,17 @@ static __be64 instance_id_to_tunnel_id(__u8 *iid)
  */
 static u16 get_src_port(struct sk_buff *skb)
 {
-       int low;
-       int high;
+       u32 hash = skb_get_rxhash(skb);
        unsigned int range;
-       struct sw_flow_key *pkt_key = OVS_CB(skb)->pkt_key;
-       u32 hash = jhash2((const u32 *)pkt_key,
-                         sizeof(*pkt_key) / sizeof(u32), 0);
+       int high;
+       int low;
+
+       if (!hash) {
+               struct sw_flow_key *pkt_key = OVS_CB(skb)->pkt_key;
+
+               hash = jhash2((const u32 *)pkt_key,
+                           sizeof(*pkt_key) / sizeof(u32), 0);
+       }
 
        inet_get_local_port_range(&low, &high);
        range = (high - low) + 1;