Added new Platform APIs and modified APIs for supporting reboot on a …

…SmartSwitch (#501)

* Modify APIs and add new APIs for supporting reboot on a SmartSwitch

* Rename dpu_name to module_name to address the review comments

sonic_platform_base/module_base.py

@@ -50,6 +50,8 @@ class ModuleBase(device_base.DeviceBase):
     MODULE_REBOOT_CPU_COMPLEX = "CPU"
     # Module reboot type to reboot FPGA complex
     MODULE_REBOOT_FPGA_COMPLEX = "FPGA"
+    # Module reboot type to reboot DPU
+    MODULE_REBOOT_DPU = "DPU"
 
     def __init__(self):
         # List of ComponentBase-derived objects representing all components
@@ -166,7 +168,9 @@ def reboot(self, reboot_type):
         Args:
             reboot_type: A string, the type of reboot requested from one of the
             predefined reboot types: MODULE_REBOOT_DEFAULT, MODULE_REBOOT_CPU_COMPLEX,
-            or MODULE_REBOOT_FPGA_COMPLEX
+            MODULE_REBOOT_FPGA_COMPLEX or MODULE_REBOOT_DPU
+
+            MODULE_REBOOT_DPU is only applicable for smartswitch chassis.
 
         Returns:
             bool: True if the request has been issued successfully, False if not
@@ -258,6 +262,31 @@ def get_state_info(self):
         """
         raise NotImplementedError
 
+    def get_bus_info(self, module_name):
+        """
+        Retrieves the bus information for the specified by "module_name" on a SmartSwitch.
+
+        Returns:
+            Returns the PCI bus information in BDF format like "[DDDD:]BB:SS:F"
+        """
+        raise NotImplementedError
+
+    def pci_detach(self, module_name):
+        """
+        Detaches the DPU PCI device specified by "module_name" on a SmartSwitch.
+
+        Returns: True once the PCI is successfully detached.
+        """
+        raise NotImplementedError
+
+    def pci_reattach(self, module_name):
+        """
+        Rescans and reconnects the DPU PCI device specified by "module_name" on a SmartSwitch.
+
+        Returns: True once the PCI is successfully reconnected.
+        """
+        raise NotImplementedError
+
     ##############################################
     # Component methods
     ##############################################

tests/module_base_test.py

@@ -8,6 +8,9 @@ def test_module_base(self):
                 [module.get_dpu_id],
                 [module.get_reboot_cause],
                 [module.get_state_info],
+                [module.get_bus_info, "module_name"],
+                [module.pci_detach, "module_name"],
+                [module.pci_reattach, "module_name"],
             ]
 
         for method in not_implemented_methods: