of12/3: support setting the oxm_value to OFPVID_NONE

In openflow spec 1.2 and 1.3.4, in order to match only packets without a VLAN tag,
the value of OFPXMT_OFB_VLAN_VID must be set to OFPVID_NONE (0x0000).
Old API of ofproto_v1_2/3_parser is now enabled to setting the oxm_value to OFPVID_NONE(0x0000) as follows:

e.g.)
    match = ofproto_v1_2_parser.OFPMatch()
    match.set_vlan_vid_none()

Signed-off-by: Minoru TAKAHASHI <takahashi.minoru7@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/ofproto/ofproto_v1_2_parser.py

@@ -3786,10 +3786,16 @@ class OFPMatch(StringifyMixin):
         self._wc.ft_set(ofproto.OFPXMT_OFB_ETH_TYPE)
         self._flow.dl_type = dl_type
 
+    def set_vlan_vid_none(self):
+        self._wc.ft_set(ofproto.OFPXMT_OFB_VLAN_VID)
+        self._wc.vlan_vid_mask = UINT16_MAX
+        self._flow.vlan_vid = ofproto.OFPVID_NONE
+
     def set_vlan_vid(self, vid):
         self.set_vlan_vid_masked(vid, UINT16_MAX)
 
     def set_vlan_vid_masked(self, vid, mask):
+        vid |= ofproto.OFPVID_PRESENT
         self._wc.ft_set(ofproto.OFPXMT_OFB_VLAN_VID)
         self._wc.vlan_vid_mask = mask
         self._flow.vlan_vid = vid
@@ -4142,10 +4148,6 @@ class MTVlanVid(OFPMatchField):
         m.value &= ~ofproto.OFPVID_PRESENT
         return m
 
-    def serialize(self, buf, offset):
-        self.value |= ofproto.OFPVID_PRESENT
-        super(MTVlanVid, self).serialize(buf, offset)
-
 
 @OFPMatchField.register_field_header([ofproto.OXM_OF_VLAN_PCP])
 class MTVlanPcp(OFPMatchField):

ryu/ofproto/ofproto_v1_3_parser.py

@@ -1250,10 +1250,16 @@ class OFPMatch(StringifyMixin):
         self._wc.ft_set(ofproto.OFPXMT_OFB_ETH_TYPE)
         self._flow.dl_type = dl_type
 
+    def set_vlan_vid_none(self):
+        self._wc.ft_set(ofproto.OFPXMT_OFB_VLAN_VID)
+        self._wc.vlan_vid_mask = UINT16_MAX
+        self._flow.vlan_vid = ofproto.OFPVID_NONE
+
     def set_vlan_vid(self, vid):
         self.set_vlan_vid_masked(vid, UINT16_MAX)
 
     def set_vlan_vid_masked(self, vid, mask):
+        vid |= ofproto.OFPVID_PRESENT
         self._wc.ft_set(ofproto.OFPXMT_OFB_VLAN_VID)
         self._wc.vlan_vid_mask = mask
         self._flow.vlan_vid = vid
@@ -1638,10 +1644,6 @@ class MTVlanVid(OFPMatchField):
         m.value &= ~ofproto.OFPVID_PRESENT
         return m
 
-    def serialize(self, buf, offset):
-        self.value |= ofproto.OFPVID_PRESENT
-        super(MTVlanVid, self).serialize(buf, offset)
-
 
 @OFPMatchField.register_field_header([ofproto.OXM_OF_VLAN_PCP])
 class MTVlanPcp(OFPMatchField):

ryu/tests/unit/ofproto/test_parser_v12.py

@@ -6853,6 +6853,40 @@ class TestOFPMatch(unittest.TestCase):
             match.set_vlan_vid_masked(vid, mask)
         self._test_serialize_and_parser(match, header, vid, mask)
 
+    def _test_set_vlan_vid_none(self):
+        header = ofproto.OXM_OF_VLAN_VID
+        match = OFPMatch()
+        match.set_vlan_vid_none()
+        value = ofproto.OFPVID_NONE
+        cls_ = OFPMatchField._FIELDS_HEADERS.get(header)
+        pack_str = cls_.pack_str.replace('!', '')
+        fmt = '!HHI' + pack_str
+
+        # serialize
+        buf = bytearray()
+        length = match.serialize(buf, 0)
+        eq_(length, len(buf))
+
+        res = list(unpack_from(fmt, str(buf), 0)[3:])
+        res_value = res.pop(0)
+        eq_(res_value, value)
+
+        # parser
+        res = match.parser(str(buf), 0)
+        eq_(res.type, ofproto.OFPMT_OXM)
+        eq_(res.fields[0].header, header)
+        eq_(res.fields[0].value, value)
+
+        # to_jsondict
+        jsondict = match.to_jsondict()
+
+        # from_jsondict
+        match2 = match.from_jsondict(jsondict["OFPMatch"])
+        buf2 = bytearray()
+        match2.serialize(buf2, 0)
+        eq_(str(match), str(match2))
+        eq_(buf, buf2)
+
     def test_set_vlan_vid_mid(self):
         self._test_set_vlan_vid(2047)
 
@@ -6871,6 +6905,9 @@ class TestOFPMatch(unittest.TestCase):
     def test_set_vlan_vid_masked_min(self):
         self._test_set_vlan_vid(2047, 0)
 
+    def test_set_vlan_vid_none(self):
+        self._test_set_vlan_vid_none()
+
     # set_vlan_pcp
     def _test_set_vlan_pcp(self, pcp):
         header = ofproto.OXM_OF_VLAN_PCP