ipv4: Use percpu Cache route in IP tunnels

percpu route cache eliminates share of dst refcnt between CPUs.

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

1 files changed, 6 insertions, 2 deletions

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index bde50fc5b4f0..9e25b1bc31da 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -38,6 +38,11 @@ struct ip_tunnel_prl_entry {
         struct rcu_head                 rcu_head;
 };
 
+struct ip_tunnel_dst {
+        struct dst_entry __rcu          *dst;
+        spinlock_t                      lock;
+};
+
 struct ip_tunnel {
         struct ip_tunnel __rcu  *next;
         struct hlist_node hash_node;
@@ -54,8 +59,7 @@ struct ip_tunnel {
         int             hlen;           /* Precalculated header length */
         int             mlink;
 
-        struct          dst_entry __rcu *dst_cache;
-        spinlock_t      dst_lock;
+        struct ip_tunnel_dst __percpu *dst_cache;
 
         struct ip_tunnel_parm parms;