From 7c0301d4a776b9d279a3f4c309ef6f42eaf58e49 Mon Sep 17 00:00:00 2001
From: mprabhu-nokia <66807480+mprabhu-nokia@users.noreply.github.com>
Date: Wed, 2 Dec 2020 14:44:41 -0500
Subject: [PATCH] Modular Chassis - APIs for midplane monitoring (#148)

- Enhance ModuleBase with new APIs to get midplane-ip-address and check-reachability
- Enhance ChassisBase with new API to initialize the midplane for modular chassis
---
 sonic_platform_base/chassis_base.py | 14 ++++++++++++++
 sonic_platform_base/module_base.py  | 26 ++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/sonic_platform_base/chassis_base.py b/sonic_platform_base/chassis_base.py
index 864d6541bb75..d5097c76fdbe 100644
--- a/sonic_platform_base/chassis_base.py
+++ b/sonic_platform_base/chassis_base.py
@@ -155,6 +155,20 @@ def is_modular_chassis(self):
         """
         return False
 
+    def init_midplane_switch(self):
+        """
+        Initializes the midplane functionality of the modular chassis. For
+        example, any validation of midplane, populating any lookup tables etc
+        can be done here. The expectation is that the required kernel modules,
+        ip-address assignment etc are done before the pmon, database dockers
+        are up.
+
+        Returns:
+            A bool value, should return True if the midplane initialized
+            successfully.
+        """
+        return NotImplementedError
+
     ##############################################
     # Component methods
     ##############################################
diff --git a/sonic_platform_base/module_base.py b/sonic_platform_base/module_base.py
index 88011dc07cda..45c0068cb291 100644
--- a/sonic_platform_base/module_base.py
+++ b/sonic_platform_base/module_base.py
@@ -442,3 +442,29 @@ def get_change_event(self, timeout=0):
         """
         raise NotImplementedError
 
+    ##############################################
+    # Midplane methods for modular chassis
+    ##############################################
+    def get_midplane_ip(self):
+        """
+        Retrieves the midplane IP-address of the module in a modular chassis
+        When called from the Supervisor, the module could represent the
+        line-card and return the midplane IP-address of the line-card.
+        When called from the line-card, the module will represent the
+        Supervisor and return its midplane IP-address.
+
+        Returns:
+            A string, the IP-address of the module reachable over the midplane
+
+        """
+        return NotImplementedError
+
+    def is_midplane_reachable(self):
+        """
+        Retrieves the reachability status of the module from the Supervisor or
+        of the Supervisor from the module via the midplane of the modular chassis
+
+        Returns:
+            A bool value, should return True if module is reachable via midplane
+        """
+        return NotImplementedError