[subinterface] Fix route add command to accept subinterface as dev (sonic-net#2180)

* [subinterface]Fixing static route add command to accept subinterface as dev

Author: dgsudharsan

config/main.py

@@ -5053,6 +5053,7 @@ def add_route(ctx, command_str):
         if (not route['ifname'] in config_db.get_keys('VLAN_INTERFACE') and
             not route['ifname'] in config_db.get_keys('INTERFACE') and
             not route['ifname'] in config_db.get_keys('PORTCHANNEL_INTERFACE') and
+            not route['ifname'] in config_db.get_keys('VLAN_SUB_INTERFACE') and
             not route['ifname'] == 'null'):
             ctx.fail('interface {} doesn`t exist'.format(route['ifname']))
 

doc/Command-Reference.md

@@ -8431,6 +8431,7 @@ This command is used to add a static route. Note that prefix /nexthop vrf`s and
 
   ```
   admin@sonic:~$ config route add prefix 2.2.3.4/32 nexthop 30.0.0.9
+  admin@sonic:~$ config route add prefix 4.0.0.0/24 nexthop dev Ethernet32.10
   ```
 
 It also supports ECMP, and adding a new nexthop to the existing prefix will complement it and not overwrite them.

tests/mock_tables/config_db.json

@@ -373,10 +373,16 @@
     "VLAN_SUB_INTERFACE|Ethernet0.10": {
         "admin_status": "up"
     },
+    "VLAN_SUB_INTERFACE|Ethernet0.10|10.11.12.13/24": {
+        "NULL" : "NULL"
+    },
     "VLAN_SUB_INTERFACE|Eth32.10": {
         "admin_status": "up",
         "vlan": "100"
     },
+    "VLAN_SUB_INTERFACE|Eth32.10|32.10.11.12/24": {
+        "NULL" : "NULL"
+    },
     "ACL_RULE|NULL_ROUTE_V4|DEFAULT_RULE": {
         "PACKET_ACTION": "DROP",
         "PRIORITY": "1"

tests/static_routes_test.py

@@ -372,6 +372,37 @@ def test_del_entire_ECMP_static_route(self):
         print(result.exit_code, result.output)
         assert not '14.2.3.4/32' in db.cfgdb.get_table('STATIC_ROUTE')
 
+    def test_static_route_nexthop_subinterface(self):
+        db = Db()
+        runner = CliRunner()
+        obj = {'config_db':db.cfgdb}
+
+        # config route add prefix 2.2.3.5/32 nexthop dev Ethernet0.10
+        result = runner.invoke(config.config.commands["route"].commands["add"], \
+        ["prefix", "2.2.3.5/32", "nexthop", "dev", "Ethernet0.10"], obj=obj)
+        print(result.exit_code, result.output)
+        assert ('2.2.3.5/32') in db.cfgdb.get_table('STATIC_ROUTE')
+        assert db.cfgdb.get_entry('STATIC_ROUTE', '2.2.3.5/32') == {'nexthop': '', 'blackhole': 'false', 'distance': '0', 'ifname': 'Ethernet0.10', 'nexthop-vrf': ''}
+
+        # config route del prefix 2.2.3.5/32 nexthop dev Ethernet0.10
+        result = runner.invoke(config.config.commands["route"].commands["del"], \
+        ["prefix", "2.2.3.5/32", "nexthop", "dev", "Ethernet0.10"], obj=obj)
+        print(result.exit_code, result.output)
+        assert not ('2.2.3.5/32') in db.cfgdb.get_table('STATIC_ROUTE')
+
+        # config route add prefix 2.2.3.5/32 nexthop dev Eth32.10
+        result = runner.invoke(config.config.commands["route"].commands["add"], \
+        ["prefix", "2.2.3.5/32", "nexthop", "dev", "Eth32.10"], obj=obj)
+        print(result.exit_code, result.output)
+        assert ('2.2.3.5/32') in db.cfgdb.get_table('STATIC_ROUTE')
+        assert db.cfgdb.get_entry('STATIC_ROUTE', '2.2.3.5/32') == {'nexthop': '', 'blackhole': 'false', 'distance': '0', 'ifname': 'Eth32.10', 'nexthop-vrf': ''}
+
+        # config route del prefix 2.2.3.5/32 nexthop dev Eth32.10
+        result = runner.invoke(config.config.commands["route"].commands["del"], \
+        ["prefix", "2.2.3.5/32", "nexthop", "dev", "Eth32.10"], obj=obj)
+        print(result.exit_code, result.output)
+        assert not ('2.2.3.5/32') in db.cfgdb.get_table('STATIC_ROUTE')
+
     @classmethod
     def teardown_class(cls):
         os.environ['UTILITIES_UNIT_TESTING'] = "0"