mod_meter_entry causes the following error when the protocol version is 1.0 or 
1.2.

  AttributeError: 'module' object has no attribute 'OFPMC_ADD'

this patch fixes this problem.

Signed-off-by: Yuichi Ito <[email protected]>
---
 ryu/app/ofctl_rest.py |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ryu/app/ofctl_rest.py b/ryu/app/ofctl_rest.py
index 8ab53f9..e108b03 100644
--- a/ryu/app/ofctl_rest.py
+++ b/ryu/app/ofctl_rest.py
@@ -256,6 +256,11 @@ class StatsController(ControllerBase):
         if dp is None:
             return Response(status=404)

+        if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION or \
+                dp.ofproto.OFP_VERSION == ofproto_v1_2.OFP_VERSION:
+            LOG.debug('Unsupported OF protocol')
+            return Response(status=501)
+
         if cmd == 'add':
             cmd = dp.ofproto.OFPMC_ADD
         elif cmd == 'modify':
-- 
1.7.10.4


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