+/* Protocol-independent flow_mod.
+ *
+ * The handling of cookies across multiple versions of OpenFlow is a bit
+ * confusing. A full description of Open vSwitch's cookie handling is
+ * in the DESIGN file. The following table shows the expected values of
+ * the cookie-related fields for the different flow_mod commands in
+ * OpenFlow 1.0 ("OF10") and NXM. "<used>" and "-" indicate a value
+ * that may be populated and an ignored field, respectively.
+ *
+ * cookie cookie_mask new_cookie
+ * ====== =========== ==========
+ * OF10 Add - 0 <used>
+ * OF10 Modify - 0 <used>
+ * OF10 Delete - 0 -
+ * NXM Add - 0 <used>
+ * NXM Modify <used> <used> <used>
+ * NXM Delete <used> <used> -
+ */