openvswitch: Pass net into ovs_fragment

In preparation for the ipv4 and ipv6 fragmentation code taking a net
parameter pass a struct net into ovs_fragment where the v4 and v6
fragmentation code is called.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

net/openvswitch/actions.c

@@ -684,8 +684,8 @@ static void prepare_frag(struct vport *vport, struct sk_buff *skb)
 	skb_pull(skb, hlen);
 }
 
-static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
-			 __be16 ethertype)
+static void ovs_fragment(struct net *net, struct vport *vport,
+			 struct sk_buff *skb, u16 mru, __be16 ethertype)
 {
 	if (skb_network_offset(skb) > MAX_L2_LEN) {
 		OVS_NLERR(1, "L2 header too long to fragment");
@@ -748,6 +748,7 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
 		if (likely(!mru || (skb->len <= mru + ETH_HLEN))) {
 			ovs_vport_send(vport, skb);
 		} else if (mru <= vport->dev->mtu) {
+			struct net *net = read_pnet(&dp->net);
 			__be16 ethertype = key->eth.type;
 
 			if (!is_flow_key_valid(key)) {
@@ -757,7 +758,7 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
 					ethertype = vlan_get_protocol(skb);
 			}
 
-			ovs_fragment(vport, skb, mru, ethertype);
+			ovs_fragment(net, vport, skb, mru, ethertype);
 		} else {
 			kfree_skb(skb);
 		}