[vs_test] fix fdb test failed randomly (sonic-net#1118)

- Change test_FdbAddedAfterMemberCreated not to assert the count of entries but to check the existance of entry added by itself, because other entry may be learned after flush. The former test case does't clean the config, that makes more chance to learn fdb entry.

- Fix the bug is_fdb_entry_exists didn't match key. Add a function get_vlan_oid to change vlanid to bvid. Change mac format to match in asic_db.

tests/conftest.py

@@ -548,6 +548,20 @@ def get_map_iface_bridge_port_id(self, asic_db):
 
         return iface_2_bridge_port_id
 
+    def get_vlan_oid(self, asic_db, vlan_id):
+        tbl = swsscommon.Table(asic_db, "ASIC_STATE:SAI_OBJECT_TYPE_VLAN")
+        keys = tbl.getKeys()
+
+        for key in keys:
+            status, fvs = tbl.get(key)
+            assert status, "Error reading from table %s" % "ASIC_STATE:SAI_OBJECT_TYPE_VLAN"
+
+            for k, v in fvs:
+                if k == "SAI_VLAN_ATTR_VLAN_ID" and v == vlan_id:
+                    return True, key
+
+        return False, "Not found vlan id %s" % vlan_id
+
     def is_table_entry_exists(self, db, table, keyregex, attributes):
         tbl = swsscommon.Table(db, table)
         keys = tbl.getKeys()
@@ -637,11 +651,15 @@ def is_fdb_entry_exists(self, db, table, key_values, attributes):
             except ValueError:
                 d_key = json.loads('{' + key + '}')
 
+            key_found = True
+
             for k, v in key_values:
                 if k not in d_key or v != d_key[k]:
-                    continue
+                    key_found = False
+                    break
 
-            key_found = True
+            if not key_found:
+                continue
 
             status, fvs = tbl.get(key)
             assert status, "Error reading from table %s" % table

tests/test_fdb.py

@@ -334,16 +334,26 @@ def test_FdbAddedAfterMemberCreated(self, dvs, testlog):
             ]
         )
 
-        # check that the FDB entry wasn't inserted into ASIC DB
-        assert how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY") == 0, "The fdb entry leaked to ASIC"
-
         vlan_before = how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_VLAN")
         bp_before = how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_BRIDGE_PORT")
         vm_before = how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_VLAN_MEMBER")
 
         # create vlan
         dvs.create_vlan("2")
+        time.sleep(1)
+
+        # Get bvid from vlanid
+        ok, bvid = dvs.get_vlan_oid(dvs.adb, "2")
+        assert ok, bvid
+
+        # check that the FDB entry wasn't inserted into ASIC DB
+        ok, extra = dvs.is_fdb_entry_exists(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY",
+                        [("mac", "52:54:00:25:06:E9"), ("bvid", bvid)], [])
+        assert ok == False, "The fdb entry leaked to ASIC"
+
+        # create vlan member
         dvs.create_vlan_member("2", "Ethernet0")
+        time.sleep(1)
 
         # check that the vlan information was propagated
         vlan_after = how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_VLAN")
@@ -358,10 +368,8 @@ def test_FdbAddedAfterMemberCreated(self, dvs, testlog):
         iface_2_bridge_port_id = dvs.get_map_iface_bridge_port_id(dvs.adb)
 
         # check that the FDB entry was inserted into ASIC DB
-        assert how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY") == 1, "The fdb entry wasn't inserted to ASIC"
-
         ok, extra = dvs.is_fdb_entry_exists(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY",
-                        [("mac", "52-54-00-25-06-E9"), ("vlan", "2")],
+                        [("mac", "52:54:00:25:06:E9"), ("bvid", bvid)],
                         [("SAI_FDB_ENTRY_ATTR_TYPE", "SAI_FDB_ENTRY_TYPE_DYNAMIC"),
                          ("SAI_FDB_ENTRY_ATTR_BRIDGE_PORT_ID", iface_2_bridge_port_id["Ethernet0"]),
                          ('SAI_FDB_ENTRY_ATTR_PACKET_ACTION', 'SAI_PACKET_ACTION_FORWARD')]

tests/test_fdb_update.py

@@ -102,14 +102,18 @@ def test_FDBAddedAndUpdated(dvs, testlog):
     assert bp_after - bp_before == 1, "The bridge port wasn't created"
     assert vm_after - vm_before == 1, "The vlan member wasn't added"
 
+    # Get bvid from vlanid
+    ok, bvid = dvs.get_vlan_oid(dvs.adb, "2")
+    assert ok, bvid
+
     # Get mapping between interface name and its bridge port_id
     iface_2_bridge_port_id = dvs.get_map_iface_bridge_port_id(dvs.adb)
 
     # check that the FDB entry was inserted into ASIC DB
     assert how_many_entries_exist(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY") == 1, "The fdb entry wasn't inserted to ASIC"
 
     ok, extra = dvs.is_fdb_entry_exists(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY",
-                    [("mac", "52-54-00-25-06-E9"), ("vlan", "2")],
+                    [("mac", "52:54:00:25:06:E9"), ("bvid", bvid)],
                     [("SAI_FDB_ENTRY_ATTR_TYPE", "SAI_FDB_ENTRY_TYPE_DYNAMIC"),
                      ("SAI_FDB_ENTRY_ATTR_BRIDGE_PORT_ID", iface_2_bridge_port_id["Ethernet0"]),
                      ('SAI_FDB_ENTRY_ATTR_PACKET_ACTION', 'SAI_PACKET_ACTION_FORWARD')]
@@ -139,7 +143,7 @@ def test_FDBAddedAndUpdated(dvs, testlog):
     iface_2_bridge_port_id = dvs.get_map_iface_bridge_port_id(dvs.adb)
 
     ok, extra = dvs.is_fdb_entry_exists(dvs.adb, "ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY",
-                    [("mac", "52-54-00-25-06-E9"), ("vlan", "2")],
+                    [("mac", "52:54:00:25:06:E9"), ("bvid", bvid)],
                     [("SAI_FDB_ENTRY_ATTR_TYPE", "SAI_FDB_ENTRY_TYPE_DYNAMIC"),
                      ("SAI_FDB_ENTRY_ATTR_BRIDGE_PORT_ID", iface_2_bridge_port_id["Ethernet4"]),
                      ('SAI_FDB_ENTRY_ATTR_PACKET_ACTION', 'SAI_PACKET_ACTION_FORWARD')]