X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fodp-util.h;h=a88c7eec8709d0b6c5ae2ae75861991126488fda;hb=0ab14c8e284b7c5c68aff1ccc6795a1d4b58bd49;hp=2062c0643c5052729d8019f95b90852f84b2a20b;hpb=feebdea2e5550a71c7accda936b6a55962f60a04;p=openvswitch

diff --git a/lib/odp-util.h b/lib/odp-util.h
index 2062c064..a88c7eec 100644
--- a/lib/odp-util.h
+++ b/lib/odp-util.h
@@ -30,6 +30,8 @@ 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)
 {
@@ -60,17 +62,36 @@ 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 *);
 
-/* By my calculations currently the longest valid nlattr-formatted flow key is
- * 80 bytes long, so this leaves some safety margin.
+/* Upper bound on the length of a nlattr-formatted flow key.  The longest
+ * nlattr-formatted flow key would be:
  *
- * 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 96
-#define ODPUTIL_FLOW_KEY_U32S DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)
+ *                         struct  pad  nl hdr  total
+ *                         ------  ---  ------  -----
+ *  ODP_KEY_ATTR_TUN_ID        8    --     4     12
+ *  ODP_KEY_ATTR_IN_PORT       4    --     4      8
+ *  ODP_KEY_ATTR_ETHERNET     12    --     4     16
+ *  ODP_KEY_ATTR_8021Q         4    --     4      8
+ *  ODP_KEY_ATTR_ETHERTYPE     2     2     4      8
+ *  ODP_KEY_ATTR_IPV6         34     2     4     40
+ *  ODP_KEY_ATTR_ICMPV6        2     2     4      8
+ *  ODP_KEY_ATTR_ND           28    --     4     32
+ *  -------------------------------------------------
+ *  total                                       132
+ */
+#define ODPUTIL_FLOW_KEY_BYTES 132
+
+/* This is an imperfect sanity-check that ODPUTIL_FLOW_KEY_BYTES doesn't
+ * need to be updated, but will at least raise awareness when new ODP
+ * key types are added. */
+BUILD_ASSERT_DECL(__ODP_KEY_ATTR_MAX == 14);
+
+/* A buffer with sufficient size and alignment to hold an nlattr-formatted flow
+ * key.  An array of "struct nlattr" might not, in theory, be sufficiently
+ * aligned because it only contains 16-bit types. */
+struct odputil_keybuf {
+    uint32_t keybuf[DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)];
+};
 
 void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);