of14: Add role status support

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/ofproto/ofproto_v1_4_parser.py

@@ -4024,6 +4024,84 @@ class OFPPortStatus(MsgBase):
         return msg
 
 
+@_register_parser
+@_set_msg_type(ofproto.OFPT_ROLE_STATUS)
+class OFPRoleStatus(MsgBase):
+    """
+    Role status message
+
+    The switch notifies controller of change of role.
+
+    ================ ======================================================
+    Attribute        Description
+    ================ ======================================================
+    role             One of the following values.
+                     OFPCR_ROLE_NOCHANGE
+                     OFPCR_ROLE_EQUAL
+                     OFPCR_ROLE_MASTER
+    reason           One of the following values.
+                     OFPCRR_MASTER_REQUEST
+                     OFPCRR_CONFIG
+                     OFPCRR_EXPERIMENTER
+    generation_id    Master Election Generation ID
+    properties       List of ``OFPRoleProp`` subclass instance
+    ================ ======================================================
+
+    Example::
+
+        @set_ev_cls(ofp_event.EventOFPRoleStatus, MAIN_DISPATCHER)
+        def role_status_handler(self, ev):
+            msg = ev.msg
+            dp = msg.datapath
+            ofp = dp.ofproto
+
+            if msg.role == ofp.OFPCR_ROLE_NOCHANGE:
+                role = 'ROLE NOCHANGE'
+            elif msg.role == ofp.OFPCR_ROLE_EQUAL:
+                role = 'ROLE EQUAL'
+            elif msg.role == ofp.OFPCR_ROLE_MASTER:
+                role = 'ROLE MASTER'
+            else:
+                role = 'unknown'
+
+            if msg.reason == ofp.OFPCRR_MASTER_REQUEST:
+                reason = 'MASTER REQUEST'
+            elif msg.reason == ofp.OFPCRR_CONFIG:
+                reason = 'CONFIG'
+            elif msg.reason == ofp.OFPCRR_EXPERIMENTER:
+                reason = 'EXPERIMENTER'
+            else:
+                reason = 'unknown'
+
+            self.logger.debug('OFPRoleStatus received: role=%s reason=%s '
+                              'generation_id=%d properties=%s', role, reason,
+                              msg.generation_id, repr(msg.properties))
+    """
+    def __init__(self, datapath, role=None, reason=None,
+                 generation_id=None, properties=None):
+        super(OFPRoleStatus, self).__init__(datapath)
+        self.role = role
+        self.reason = reason
+        self.generation_id = generation_id
+        self.properties = properties
+
+    @classmethod
+    def parser(cls, datapath, version, msg_type, msg_len, xid, buf):
+        msg = super(OFPRoleStatus, cls).parser(datapath, version, msg_type,
+                                               msg_len, xid, buf)
+        (msg.role, msg.reason, msg.generation_id) = struct.unpack_from(
+            ofproto.OFP_ROLE_STATUS_PACK_STR, msg.buf,
+            ofproto.OFP_HEADER_SIZE)
+
+        msg.properties = []
+        rest = msg.buf[ofproto.OFP_ROLE_STATUS_SIZE:]
+        while rest:
+            p, rest = OFPRoleProp.parse(rest)
+            msg.properties.append(p)
+
+        return msg
+
+
 @_set_msg_type(ofproto.OFPT_PACKET_OUT)
 class OFPPacketOut(MsgBase):
     """