NXM: Add MFTunId class

This is to handle TUN_ID and TUN_ID_W NXM fields.
This will be used when sending NXT_FLOW_MOD messages.

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

ryu/ofproto/nx_match.py

@@ -41,6 +41,7 @@ class Flow(object):
 
 class FlowWildcards(object):
     def __init__(self):
+        self.tun_id_mask = 0
         self.wildcards = FWW_ALL
 
 
@@ -53,6 +54,14 @@ class ClsRule(object):
         self.wc.wildcards &= ~FWW_IN_PORT
         self.flow.in_port = port
 
+    def set_tun_id(self, tun_id):
+        self.set_tun_id_masked(tun_id, UINT64_MAX)
+
+    def set_tun_id_masked(self, tun_id, mask):
+        self.wc.tun_id_mask = mask
+        self.flow.tun_id = tun_id & mask
+
+
 def _set_nxm_headers(nxm_headers):
     '''Annotate corresponding NXM header'''
     def _set_nxm_headers(self):
@@ -116,6 +125,17 @@ class MFInPort(MFField):
         return self._put(buf, offset, rule.flow.in_port)
 
 
+@_register_make
+@_set_nxm_headers([ofproto_v1_0.NXM_NX_TUN_ID, ofproto_v1_0.NXM_NX_TUN_ID_W])
+class MFTunId(MFField):
+    @classmethod
+    def make(cls):
+        return cls(MF_PACK_STRING_BE64)
+
+    def put(self, buf, offset, rule):
+        return self.putm(buf, offset, rule.flow.tun_id, rule.wc.tun_id_mask)
+
+
 def serialize_nxm_match(rule, buf, offset):
     old_offset = offset
 

ryu/ofproto/ofproto_v1_0.py

@@ -517,4 +517,7 @@ def nxm_header_w(vendor, field, length):
 
 NXM_OF_IN_PORT = nxm_header(0x0000,  0, 2)
 
+NXM_NX_TUN_ID = nxm_header(0x0001, 16, 8)
+NXM_NX_TUN_ID_W = nxm_header_w(0x0001, 16, 8)
+
 NXM_HEADER_PACK_STRING = '!I'