[minigraph] Add tagged vlan member support for storage backend (#9045)

Signed-off-by: Neetha John <nejo@microsoft.com>

Why I did it
Storage T0's have all vlan members as tagged

How I did it
Since currently minigraph does not have a unique way to identify if a vlan member is tagged/untagged and to ensure other scenarios are not broken, the logic used is to just update the vlan member type as 'tagged' when we determine that it is a storage backend device. This change will apply only to storage backend T0's since storage backend T1's will not have vlan member information

How to verify it
Updated the storage backend T0 testcases to check for tagged vlan members
Added testcase to check if a T1 and backend T1 device generates an empty vlan member table
Existing vlan member testcases are good enough for checking if any regression has been caused for regular T0's
Build sonic_config_engine-1.0-py3-none-any.whl successfully

src/sonic-config-engine/minigraph.py

@@ -1551,6 +1551,9 @@ def parse_xml(filename, platform=None, port_config_file=None, asic_name=None, hw
         del results['PORTCHANNEL_INTERFACE']
         is_storage_device = True
         results['VLAN_SUB_INTERFACE'] = vlan_sub_intfs
+        # storage backend T0 have all vlan members tagged
+        for vlan in vlan_members:
+            vlan_members[vlan]["tagging_mode"] = "tagged"
     elif current_device['type'] in backend_device_types and (resource_type is None or 'Storage' in resource_type):
         del results['INTERFACE']
         del results['PORTCHANNEL_INTERFACE']
@@ -1576,6 +1579,9 @@ def parse_xml(filename, platform=None, port_config_file=None, asic_name=None, hw
                 sub_intf = pc_intf + VLAN_SUB_INTERFACE_SEPARATOR + VLAN_SUB_INTERFACE_VLAN_ID
                 vlan_sub_intfs[sub_intf] = {"admin_status" : "up"}
         results['VLAN_SUB_INTERFACE'] = vlan_sub_intfs
+        # storage backend T0 have all vlan members tagged
+        for vlan in vlan_members:
+            vlan_members[vlan]["tagging_mode"] = "tagged"
     elif resource_type is not None and 'Storage' in resource_type:
         is_storage_device = True
     elif bool(vlan_sub_intfs):

src/sonic-config-engine/tests/test_cfggen.py

@@ -8,6 +8,8 @@ from unittest import TestCase
 
 TOR_ROUTER = 'ToRRouter'
 BACKEND_TOR_ROUTER = 'BackEndToRRouter'
+LEAF_ROUTER = 'LeafRouter'
+BACKEND_LEAF_ROUTER = 'BackEndLeafRouter'
 
 class TestCfgGen(TestCase):
 
@@ -136,8 +138,20 @@ class TestCfgGen(TestCase):
 
     def test_var_json_data(self, **kwargs):
         graph_file = kwargs.get('graph_file', self.sample_graph_simple)
+        tag_mode = kwargs.get('tag_mode', 'untagged')
         argument = '-m "' + graph_file + '" -p "' + self.port_config + '" --var-json VLAN_MEMBER'
         output = self.run_script(argument)
+        if tag_mode == "tagged":
+            self.assertEqual(
+                utils.to_dict(output.strip()),
+                utils.to_dict(
+                    '{\n    "Vlan1000|Ethernet8": {\n        "tagging_mode": "tagged"\n    },'
+                    ' \n    "Vlan2000|Ethernet12": {\n        "tagging_mode": "tagged"\n    },'
+                    ' \n    "Vlan2001|Ethernet12": {\n        "tagging_mode": "tagged"\n    },'
+                    ' \n    "Vlan2020|Ethernet12": {\n        "tagging_mode": "tagged"\n    }\n}'
+                )
+            )
+        else:
             self.assertEqual(
                 utils.to_dict(output.strip()),
                 utils.to_dict(
@@ -238,8 +252,20 @@ class TestCfgGen(TestCase):
 
     def test_minigraph_vlan_members(self, **kwargs):
         graph_file = kwargs.get('graph_file', self.sample_graph_simple)
+        tag_mode = kwargs.get('tag_mode', 'untagged')
         argument = '-m "' + graph_file + '" -p "' + self.port_config + '" -v VLAN_MEMBER'
         output = self.run_script(argument)
+        if tag_mode == "tagged":
+            self.assertEqual(
+                utils.to_dict(output.strip()),
+                utils.to_dict(
+                    "{('Vlan2000', 'Ethernet12'): {'tagging_mode': 'tagged'}, "
+                    "('Vlan1000', 'Ethernet8'): {'tagging_mode': 'tagged'}, "
+                    "('Vlan2020', 'Ethernet12'): {'tagging_mode': 'tagged'}, "
+                    "('Vlan2001', 'Ethernet12'): {'tagging_mode': 'tagged'}}"
+                )
+            )
+        else:
             self.assertEqual(
                 utils.to_dict(output.strip()),
                 utils.to_dict(
@@ -674,6 +700,33 @@ class TestCfgGen(TestCase):
     def test_minigraph_sub_port_intf_sub(self, check_stderr=True):
         self.verify_sub_intf(graph_file=self.sample_subintf_graph, check_stderr=check_stderr)
 
+    def test_minigraph_no_vlan_member(self, check_stderr=True):
+        self.verify_no_vlan_member()
+
+    def test_minigraph_sub_port_no_vlan_member(self, check_stderr=True):
+        try:
+            print('\n    Change device type to %s' % (BACKEND_LEAF_ROUTER))
+            if check_stderr:
+                output = subprocess.check_output("sed -i \'s/%s/%s/g\' %s" % (LEAF_ROUTER, BACKEND_LEAF_ROUTER, self.sample_graph), stderr=subprocess.STDOUT, shell=True)
+            else:
+                output = subprocess.check_output("sed -i \'s/%s/%s/g\' %s" % (LEAF_ROUTER, BACKEND_LEAF_ROUTER, self.sample_graph), shell=True)
+
+            self.test_jinja_expression(self.sample_graph, BACKEND_LEAF_ROUTER)
+            self.verify_no_vlan_member()
+        finally:
+            print('\n    Change device type back to %s' % (LEAF_ROUTER))
+            if check_stderr:
+                output = subprocess.check_output("sed -i \'s/%s/%s/g\' %s" % (BACKEND_LEAF_ROUTER, LEAF_ROUTER, self.sample_graph), stderr=subprocess.STDOUT, shell=True)
+            else:
+                output = subprocess.check_output("sed -i \'s/%s/%s/g\' %s" % (BACKEND_LEAF_ROUTER, LEAF_ROUTER, self.sample_graph), shell=True)
+
+            self.test_jinja_expression(self.sample_graph, LEAF_ROUTER)
+
+    def verify_no_vlan_member(self):
+        argument = '-m "' + self.sample_graph + '" -p "' + self.port_config + '" -v "VLAN_MEMBER"'
+        output = self.run_script(argument)
+        self.assertEqual(output.strip(), "{}")
+
     def verify_sub_intf(self, **kwargs):
         graph_file = kwargs.get('graph_file', self.sample_graph_simple)
         check_stderr = kwargs.get('check_stderr', True)
@@ -698,9 +751,7 @@ class TestCfgGen(TestCase):
             self.assertEqual(output.strip(), "")
 
             # All the other tables stay unchanged
-            self.test_var_json_data(graph_file=graph_file)
             self.test_minigraph_vlans(graph_file=graph_file)
-            self.test_minigraph_vlan_members(graph_file=graph_file)
             self.test_minigraph_vlan_interfaces(graph_file=graph_file)
             self.test_minigraph_portchannels(graph_file=graph_file)
             self.test_minigraph_ethernet_interfaces(graph_file=graph_file)
@@ -735,6 +786,10 @@ class TestCfgGen(TestCase):
                     )
                 )
 
+            # VLAN_MEMBER table should have all tagged members
+            self.test_var_json_data(graph_file=graph_file, tag_mode='tagged')
+            self.test_minigraph_vlan_members(graph_file=graph_file, tag_mode='tagged')
+
         finally:
             print('\n    Change device type back to %s' % (TOR_ROUTER))
             if check_stderr: