nicira-ext: Support matching IPv6 Neighbor Discovery messages.

[sliver-openvswitch.git] / lib / odp-util.h

diff --git a/lib/odp-util.h b/lib/odp-util.h
index 6051c52..074df87 100644 (file)
--- a/lib/odp-util.h
+++ b/lib/odp-util.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2010 Nicira Networks.
+ * Copyright (c) 2009, 2010, 2011 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,9 @@
 
 struct ds;
 struct flow;
+struct ofpbuf;
+
+#define ODPP_NONE ((uint16_t) -1)
 
 static inline uint16_t
 ofp_port_to_odp_port(uint16_t ofp_port)
@@ -55,29 +58,24 @@ odp_port_to_ofp_port(uint16_t odp_port)
     }
 }
 
-void format_odp_flow_key(struct ds *, const struct odp_flow_key *);
 int odp_action_len(uint16_t type);
 void format_odp_action(struct ds *, const struct nlattr *);
 void format_odp_actions(struct ds *, const struct nlattr *odp_actions,
                         size_t actions_len);
-void format_odp_flow_stats(struct ds *, const struct odp_flow_stats *);
-void format_odp_flow(struct ds *, const struct odp_flow *);
 
-void odp_flow_key_from_flow(struct odp_flow_key *, const struct flow *);
-void odp_flow_key_to_flow(const struct odp_flow_key *, struct flow *);
+/* By my calculations currently the longest valid nlattr-formatted flow key is
+ * 124 bytes long, so this leaves some safety margin.
+ *
+ * We allocate temporary on-stack buffers for flow keys as arrays of uint32_t
+ * to ensure proper 32-bit alignment for Netlink attributes.  (An array of
+ * "struct nlattr" might not, in theory, be sufficiently aligned because it
+ * only contains 16-bit types.) */
+#define ODPUTIL_FLOW_KEY_BYTES 144
+#define ODPUTIL_FLOW_KEY_U32S DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)
 
-static inline bool
-odp_flow_key_equal(const struct odp_flow_key *a, const struct odp_flow_key *b)
-{
-    return !memcmp(a, b, sizeof *a);
-}
+void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);
 
-static inline size_t
-odp_flow_key_hash(const struct odp_flow_key *flow, uint32_t basis)
-{
-    BUILD_ASSERT_DECL(!(sizeof *flow % sizeof(uint32_t)));
-    return hash_words((const uint32_t *) flow,
-                      sizeof *flow / sizeof(uint32_t), basis);
-}
+void odp_flow_key_from_flow(struct ofpbuf *, const struct flow *);
+int odp_flow_key_to_flow(const struct nlattr *, size_t, struct flow *);
 
 #endif /* odp-util.h */