- /* NXM and OXM properties.
- *
- * There are the following possibilities for these members for a given
- * mf_field:
- *
- * - Neither NXM nor OXM defines such a field: these members will all be
- * zero or NULL.
- *
- * - NXM and OXM both define such a field: nxm_header and oxm_header will
- * both be nonzero and different, similarly for nxm_name and oxm_name.
- * In this case, 'oxm_version' is significant: if it is greater than
- * OFP12_VERSION, then only that version of OpenFlow introduced this
- * OXM header, so ovs-vswitchd should send 'nxm_header' instead with
- * earlier protocol versions to avoid confusing controllers that were
- * using a previous Open vSwitch extension.
- *
- * - Only NXM or only OXM defines such a field: nxm_header and oxm_header
- * will both have the same value (either an OXM_* or NXM_* value) and
- * similarly for nxm_name and oxm_name.
- *
- * Thus, 'nxm_header' is the appropriate header to use when outputting an
- * NXM formatted match, since it will be an NXM_* constant when possible
- * for compatibility with OpenFlow implementations that expect that, with
- * OXM_* constants used for fields that OXM adds. Conversely, 'oxm_header'
- * is the header to use when outputting an OXM formatted match to an
- * OpenFlow connection of version 'oxm_version' or above (and otherwise
- * 'nxm_header'). */
- uint32_t nxm_header; /* An NXM_* (or OXM_*) constant. */
- const char *nxm_name; /* The nxm_header constant's name. */
- uint32_t oxm_header; /* An OXM_* (or NXM_*) constant. */
- const char *oxm_name; /* The oxm_header constant's name */
- enum ofp_version oxm_version; /* OpenFlow version that added oxm_header. */
-