X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fodp-util.h;h=4020660b43998854214d289f8d66e1feed73ae75;hb=e868fb3d322f5c46385f1fc6db5bb1ab33f90305;hp=8ec09f3cf1430029bea8cfe414e8b1f18f3b3470;hpb=d31f1109f10e5ffb9bf266306b913ebf23781666;p=openvswitch

diff --git a/lib/odp-util.h b/lib/odp-util.h
index 8ec09f3c..4020660b 100644
--- a/lib/odp-util.h
+++ b/lib/odp-util.h
@@ -63,14 +63,33 @@ void format_odp_action(struct ds *, const struct nlattr *);
 void format_odp_actions(struct ds *, const struct nlattr *odp_actions,
                         size_t actions_len);
 
-/* By my calculations currently the longest valid nlattr-formatted flow key is
- * 92 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
+ *                         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);
+
+/* 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 112
 #define ODPUTIL_FLOW_KEY_U32S DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)
 
 void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);