From 2aabda18548c66394bdce28e29a5bb8be77b081a Mon Sep 17 00:00:00 2001
From: Arun Saravanan Balachandran
 <52521751+ArunSaravananBalachandran@users.noreply.github.com>
Date: Thu, 7 Dec 2023 23:38:42 +0530
Subject: [PATCH] [Dell] S6100 - Update EEPROM API serial_number_str to return
 service tag instead of serial number (#17440)

To modify EEPROM API serial_number_str to return service tag instead of serial number in Dell S6100.
Ref PR: #1239

How I did it
Update EEPROM API serial_number_str to return service tag instead of serial number.

How to verify it
Verify decode-syseeprom -s returns service tag in Dell S6100.
---
 .../s6100/sonic_platform/chassis.py            |  2 +-
 .../s6100/sonic_platform/eeprom.py             | 18 ++++++++----------
 .../s6100/sonic_platform/module.py             |  2 +-
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
index b3d258f32e8f..4303e187c433 100755
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
@@ -207,7 +207,7 @@ def get_serial(self):
         Returns:
             string: Serial number of chassis
         """
-        return self._eeprom.serial_str()
+        return self._eeprom.serial_number_str()
 
     def get_status(self):
         """
diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py
index ab3bb174e62b..500b2c0e4a53 100644
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py
@@ -78,8 +78,14 @@ def __init__(self, i2c_line=0, iom_eeprom=False):
                 self.eeprom_tlv_dict[mac_code] = '00:00:00:00:00:00'
 
     def serial_number_str(self):
-        (is_valid, results) = self.get_tlv_field(
-                    self.eeprom_data, self._TLV_CODE_SERIAL_NUMBER)
+        # For Chassis, return service tag instead of serial number
+        if not self.is_module:
+            (is_valid, results) = self.get_tlv_field(
+                        self.eeprom_data, self._TLV_CODE_SERVICE_TAG)
+        else:
+            (is_valid, results) = self.get_tlv_field(
+                        self.eeprom_data, self._TLV_CODE_SERIAL_NUMBER)
+
         if not is_valid:
             return "N/A"
 
@@ -113,14 +119,6 @@ def part_number_str(self):
 
         return results[2].decode('ascii')
 
-    def serial_str(self):
-        (is_valid, results) = self.get_tlv_field(
-                    self.eeprom_data, self._TLV_CODE_SERVICE_TAG)
-        if not is_valid:
-            return "N/A"
-
-        return results[2].decode('ascii')
-
     def revision_str(self):
         (is_valid, results) = self.get_tlv_field(
                     self.eeprom_data, self._TLV_CODE_LABEL_REVISION)
diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py
index 163a0ab3981c..751d90fcc6ca 100644
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py
@@ -139,7 +139,7 @@ def get_serial(self):
         Returns:
             string: Serial number of module
         """
-        return self._eeprom.serial_str()
+        return self._eeprom.serial_number_str()
 
     def get_status(self):
         """