[aclorch]: Check for existing mirror table only when creating a new t…

…able (sonic-net#1089)

* Display mirror table type
Signed-off-by: Danny Allen <daall@microsoft.com>

orchagent/aclorch.cpp

@@ -2413,6 +2413,31 @@ bool AclOrch::addAclTable(AclTable &newTable, string table_id)
             return false;
         }
     }
+    else
+    {
+        // If ACL table is new, check for the existence of current mirror tables
+        // Note: only one table per mirror type can be created
+        auto table_type = newTable.type;
+        if (table_type == ACL_TABLE_MIRROR || table_type == ACL_TABLE_MIRRORV6)
+        {
+            string mirror_type;
+            if ((table_type == ACL_TABLE_MIRROR && !m_mirrorTableId.empty()))
+            {
+                mirror_type = TABLE_TYPE_MIRROR;
+            }
+
+            if (table_type == ACL_TABLE_MIRRORV6 && !m_mirrorV6TableId.empty())
+            {
+                mirror_type = TABLE_TYPE_MIRRORV6;
+            }
+
+            if (!mirror_type.empty())
+            {
+                SWSS_LOG_ERROR("Mirror table %s has already been created", mirror_type.c_str());
+                return false;
+            }
+        }
+    }
 
     // Check if a separate mirror table is needed or not based on the platform
     if (newTable.type == ACL_TABLE_MIRROR || newTable.type == ACL_TABLE_MIRRORV6)
@@ -2845,15 +2870,6 @@ bool AclOrch::processAclTableType(string type, acl_table_type_t &table_type)
             SWSS_LOG_ERROR("Mirror table type %s is not supported", type.c_str());
             return false;
         }
-
-        // Check the existence of current mirror tables
-        // Note: only one table per type could be created
-        if ((table_type == ACL_TABLE_MIRROR && !m_mirrorTableId.empty()) ||
-                (table_type == ACL_TABLE_MIRRORV6 && !m_mirrorV6TableId.empty()))
-        {
-            SWSS_LOG_ERROR("Mirror table table_type %s has already been created", type.c_str());
-            return false;
-        }
     }
 
     return true;