[SmartSwitch] Add a new API for the DPU chassis to query dataplane an…

…d midplane states

sonic_platform_base/chassis_base.py

@@ -280,26 +280,60 @@ def get_module_index(self, module_name):
     # SmartSwitch methods
     ##############################################
 
-    def get_dpu_id(self, name):
+    def get_dpu_id(self, **kwargs):
         """
-        Retrieves the DPU ID for the given dpu-module name.
-        Returns None for non-smartswitch chassis.
+        Retrieves the DPU ID for the specified DPU module on a Smart Switch chassis.
+
+        When run on the Smart Switch chassis, it fetches the ID corresponding to provided DPU module name.
+        When run on the Smart Switch DPU chassis, returns the ID of the DPU.
+        This method is relevant only for Smart Switch chassis.
+
+        Args:
+            name (str, optional): The name of the DPU module (e.g., "DPU0", "DPU1").
 
         Returns:
-            An integer, indicating the DPU ID Ex: name:DPU0 return value 0,
-            name:DPU1 return value 1, name:DPUX return value X
+            int: The DPU ID associated with the given module name.
+            For example, for name "DPU0", returns 0; for "DPU1", returns 1, and so on.
         """
         raise NotImplementedError
 
     def is_smartswitch(self):
         """
-        Retrieves whether the sonic instance is part of smartswitch
+        Checks whether the current SONiC instance is part of a Smart Switch platform.
 
         Returns:
-            Returns:True for SmartSwitch and False for other platforms
+            bool: True if the instance is part of a Smart Switch, False otherwise.
         """
         return False
 
+    def is_dpu(self):
+        """
+        Checks whether the current SONiC instance is running on a DPU.
+
+        Returns:
+            bool: True if the instance is running on a DPU, False otherwise.
+        """
+        return False
+
+    def get_dataplane_state(self):
+        """
+        Retrieves the status of the dataplane.
+
+        Returns:
+            bool: True if the dataplane is UP, False if it is down.
+        """
+        raise NotImplementedError
+
+    def get_controlplane_state(self):
+        """
+        Retrieves the status of the DPU control plane.
+
+        Returns:
+            bool: True if the control plane is UP, False if it is down.
+        """
+        raise NotImplementedError
+
+
     ##############################################
     # Fan methods
     ##############################################

tests/chassis_base_test.py

@@ -20,17 +20,20 @@ def test_reboot_cause(self):
     def test_chassis_base(self):
         chassis = ChassisBase()
         not_implemented_methods = [
-                [chassis.get_uid_led],
-                [chassis.set_uid_led, "COLOR"],
-                [chassis.get_dpu_id, "DPU0"],
+                [chassis.get_uid_led, [], {}],
+                [chassis.set_uid_led, ["COLOR"], {}],
+                [chassis.get_dpu_id, [], {"name": "DPU0"}],
+                [chassis.get_dataplane_state, [], {}],
+                [chassis.get_controlplane_state, [], {}],
             ]
 
         for method in not_implemented_methods:
             exception_raised = False
             try:
                 func = method[0]
-                args = method[1:]
-                func(*args)
+                args = method[1]
+                kwargs = method[2]
+                func(*args, **kwargs)
             except NotImplementedError:
                 exception_raised = True
 
@@ -39,6 +42,7 @@ def test_chassis_base(self):
     def test_smartswitch(self):
         chassis = ChassisBase()
         assert(chassis.is_smartswitch() == False)
+        assert(chassis.is_dpu() == False)
 
     def test_sensors(self):
         chassis = ChassisBase()