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diff --git a/tools/pkt_gen/xena/json/xena_json_blocks.py b/tools/pkt_gen/xena/json/xena_json_blocks.py
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+# Copyright 2017 Red Hat Inc & Xena Networks.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Contributors:
+# Dan Amzulescu, Xena Networks
+# Christian Trautman, Red Hat Inc.
+#
+# Usage can be seen below in unit test. This implementation is designed for one
+# module two port Xena chassis runs only.
+
+"""
+Xena JSON module for blocks topology
+"""
+
+from tools.pkt_gen.xena.json.xena_json import XenaJSON
+
+
+class XenaJSONBlocks(XenaJSON):
+ """
+ Class to modify and read Xena JSON configuration files. Topology will be set
+ as Blocks
+ """
+ def __init__(self):
+ super(XenaJSONBlocks, self).__init__()
+ self.set_topology_blocks()
+
+ def set_topology_blocks(self):
+ """
+ Set the test topology to a West to East config for half duplex flow with
+ port 0 as the sender and port 1 as the receiver.
+ :return: None
+ """
+ self.json_data['TestOptions']['TopologyConfig']['Topology'] = 'BLOCKS'
+ self.json_data['TestOptions']['TopologyConfig'][
+ 'Direction'] = 'WEST_EAST'
+ self.json_data['PortHandler']['EntityList'][0][
+ 'PortGroup'] = "WEST"
+ self.json_data['PortHandler']['EntityList'][1][
+ 'PortGroup'] = "EAST"