[201911][cherry-pick] Update minigraph parser to support MIRROR_DSCP (#8826)

* Update minigraph parser to support MIRROR_DSCP

Signed-off-by: bingwang <bingwang@microsoft.com>

src/sonic-config-engine/minigraph.py

@@ -400,6 +400,7 @@ def parse_dpg(dpg, hname):
             acl_intfs = []
             is_mirror = False
             is_mirror_v6 = False
+            is_mirror_dscp = False
 
             # TODO: Ensure that acl_intfs will only ever contain front-panel interfaces (e.g.,
             # maybe we should explicity ignore management and loopback interfaces?) because we
@@ -422,8 +423,10 @@ def parse_dpg(dpg, hname):
                     # Give a warning if trying to attach ACL to a LAG member interface, correct way is to attach ACL to the LAG interface
                     if port_alias_map[member] in intfs_inpc:
                         print >> sys.stderr, "Warning: ACL " + aclname + " is attached to a LAG member interface " + port_alias_map[member] + ", instead of LAG interface"
-                elif member.lower().startswith('erspan') or member.lower().startswith('egress_erspan'):
-                    if member.lower().startswith('erspanv6') or member.lower().startswith('egress_erspanv6'):
+                elif member.lower().startswith('erspan') or member.lower().startswith('egress_erspan') or member.lower().startswith('erspan_dscp'):
+                    if 'dscp' in member.lower():
+                        is_mirror_dscp = True
+                    elif member.lower().startswith('erspanv6') or member.lower().startswith('egress_erspanv6'):
                         is_mirror_v6 = True
                     else:
                         is_mirror = True
@@ -443,7 +446,7 @@ def parse_dpg(dpg, hname):
             # are binded then do not classify as Control plane.
             # For multi-asic platforms it's possible there is no
             # interface are binded to everflow in host namespace.
-            if acl_intfs or is_mirror_v6 or is_mirror:
+            if acl_intfs or is_mirror_v6 or is_mirror or is_mirror_dscp:
                 # Remove duplications
                 dedup_intfs = []
                 for intf in acl_intfs:
@@ -457,6 +460,8 @@ def parse_dpg(dpg, hname):
                     acls[aclname]['type'] = 'MIRROR'
                 elif is_mirror_v6:
                     acls[aclname]['type'] = 'MIRRORV6'
+                elif is_mirror_dscp:
+                    acls[aclname]['type'] = 'MIRROR_DSCP'
                 else:
                     acls[aclname]['type'] = 'L3V6' if  'v6' in aclname.lower() else 'L3'
             else:
@@ -808,7 +813,7 @@ def filter_acl_table_bindings(acls, neighbors, port_channels, sub_role):
         # Control Plane ACL has no Interface associated and
         # Data Plane ACL Interface are attached via minigraph
         # AclInterface.
-        if group_type != 'MIRROR' and group_type != 'MIRRORV6':
+        if group_type != 'MIRROR' and group_type != 'MIRRORV6' and group_type != 'MIRROR_DSCP':
             continue
 
         # Filters out back-panel ports from the binding list for Everflow (Mirror)

src/sonic-config-engine/tests/simple-sample-graph-case.xml

@@ -175,6 +175,11 @@
           <InAcl>SNMP_ACL</InAcl>
           <Type>SNMP</Type>
         </AclInterface>
+        <AclInterface>
+          <AttachTo>ERSPAN_DSCP</AttachTo>
+          <InAcl>Everflow_dscp</InAcl>
+          <Type>Everflow_dscp</Type>
+        </AclInterface>
       </AclInterfaces>
       <DownstreamSummaries/>
       <DownstreamSummarySet xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution"/>

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

@@ -4,7 +4,7 @@ import subprocess
 import tests.common_utils as utils
 
 from unittest import TestCase
-
+import minigraph
 
 class TestCfgGenCaseInsensitive(TestCase):
 
@@ -155,3 +155,17 @@ class TestCfgGenCaseInsensitive(TestCase):
         argument = '-m "' + self.sample_graph + '" -p "' + self.port_config + '" -v "BGP_MONITORS"'
         output = self.run_script(argument)
         self.assertEqual(output.strip(), "{}")
+
+    def test_minigraph_mirror_dscp(self):
+        result = minigraph.parse_xml(self.sample_graph, port_config_file=self.port_config)
+        self.assertTrue('EVERFLOW_DSCP' in result['ACL_TABLE'])
+        everflow_dscp_entry = result['ACL_TABLE']['EVERFLOW_DSCP']
+
+        self.assertEqual(everflow_dscp_entry['type'], 'MIRROR_DSCP')
+        self.assertEqual(everflow_dscp_entry['stage'], 'ingress')
+        expected_ports = ['PortChannel01', 'Ethernet12', 'Ethernet8', 'Ethernet0']
+        self.assertEqual(
+            everflow_dscp_entry['ports'].sort(),
+            expected_ports.sort()
+        )
+