net: Add net protocol offload registration infrustructure

[~andy/linux] / net / ipv4 / protocol.c

diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c
index 8918eff1426d2e5da3aeaa41cb4d34824482da5a..0f9d09f54bd9d781bb74d577185c571fe632b270 100644 (file)
--- a/net/ipv4/protocol.c
+++ b/net/ipv4/protocol.c
@@ -29,6 +29,7 @@
 #include <net/protocol.h>
 
 const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
+const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
 
 /*
  *     Add a protocol handler to the hash tables
@@ -41,6 +42,13 @@ int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
 }
 EXPORT_SYMBOL(inet_add_protocol);
 
+int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
+{
+       return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
+                       NULL, prot) ? 0 : -1;
+}
+EXPORT_SYMBOL(inet_add_offload);
+
 /*
  *     Remove a protocol from the hash tables.
  */
@@ -57,3 +65,16 @@ int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
        return ret;
 }
 EXPORT_SYMBOL(inet_del_protocol);
+
+int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
+{
+       int ret;
+
+       ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
+                      prot, NULL) == prot) ? 0 : -1;
+
+       synchronize_net();
+
+       return ret;
+}
+EXPORT_SYMBOL(inet_del_offload);