datapath: add hash action

[sliver-openvswitch.git] / datapath / actions.c

diff --git a/datapath/actions.c b/datapath/actions.c
index 82cfd2d..c4b4605 100644 (file)
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -460,6 +460,21 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
                                  nla_len(acts_list), true);
 }
 
+static void execute_hash(struct sk_buff *skb, const struct nlattr *attr)
+{
+       struct sw_flow_key *key = OVS_CB(skb)->pkt_key;
+       struct ovs_action_hash *hash_act = nla_data(attr);
+       u32 hash = 0;
+
+       /* OVS_HASH_ALG_L4 is the only possible hash algorithm.  */
+       hash = skb_get_rxhash(skb);
+       hash = jhash_1word(hash, hash_act->hash_basis);
+       if (!hash)
+               hash = 0x1;
+
+       key->ovs_flow_hash = hash;
+}
+
 static int execute_set_action(struct sk_buff *skb,
                                 const struct nlattr *nested_attr)
 {
@@ -536,6 +551,10 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
                        output_userspace(dp, skb, a);
                        break;
 
+               case OVS_ACTION_ATTR_HASH:
+                       execute_hash(skb, a);
+                       break;
+
                case OVS_ACTION_ATTR_PUSH_VLAN:
                        err = push_vlan(skb, nla_data(a));
                        if (unlikely(err)) /* skb already freed. */