From 861ea26d1887354033f4568059e1f3f79c4b62e3 Mon Sep 17 00:00:00 2001
From: jingwenxie <jingwenxie@microsoft.com>
Date: Thu, 10 Mar 2022 14:42:43 -0800
Subject: [PATCH] [yang]: Update DEVICE_METADATA yang models to support
 'sub_role' (#10161)

#### Why I did it
Fix https://github.com/Azure/sonic-buildimage/issues/9591
#### How I did it
Add 'sub_role' to device_metadata yang models.
#### How to verify it
Run UT for sonc-yang-models.
---
 src/sonic-yang-models/tests/files/sample_config_db.json  | 3 ++-
 .../tests/yang_model_tests/tests/device_metadata.json    | 5 ++++-
 .../yang_model_tests/tests_config/device_metadata.json   | 9 +++++++++
 .../yang-models/sonic-device_metadata.yang               | 5 +++++
 4 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/sonic-yang-models/tests/files/sample_config_db.json b/src/sonic-yang-models/tests/files/sample_config_db.json
index 6dbffce671..920181646c 100644
--- a/src/sonic-yang-models/tests/files/sample_config_db.json
+++ b/src/sonic-yang-models/tests/files/sample_config_db.json
@@ -302,7 +302,8 @@
                 "asic_name": "Asic0",
                 "switch_id": "2",
                 "switch_type": "voq",
-                "max_cores": "8"
+                "max_cores": "8",
+                "sub_role": "FrondEnd"
             }
         },
         "VLAN": {
diff --git a/src/sonic-yang-models/tests/yang_model_tests/tests/device_metadata.json b/src/sonic-yang-models/tests/yang_model_tests/tests/device_metadata.json
index ca26e24cd3..ecfff6f69a 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/tests/device_metadata.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/tests/device_metadata.json
@@ -100,6 +100,9 @@
     },
     "DEVICE_METADATA_CORRECT_VOQ_CONFIG": {
         "desc": "Verifying VOQ configuration."
-     }
+    },
+    "DEVICE_METADATA_VALID_SUB_ROLE_CONFIG": {
+        "desc": "Verifying valid sub_role configuration."
+    }
 
 }
diff --git a/src/sonic-yang-models/tests/yang_model_tests/tests_config/device_metadata.json b/src/sonic-yang-models/tests/yang_model_tests/tests_config/device_metadata.json
index bfc9c080b7..de0d4e15dc 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/tests_config/device_metadata.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/tests_config/device_metadata.json
@@ -274,5 +274,14 @@
                 }
             }
         }
+    },
+    "DEVICE_METADATA_VALID_SUB_ROLE_CONFIG": {
+        "sonic-device_metadata:sonic-device_metadata": {
+            "sonic-device_metadata:DEVICE_METADATA": {
+                "sonic-device_metadata:localhost": {
+                    "sub_role": "FrontEnd"
+                }
+            }
+        }
     }
 }
diff --git a/src/sonic-yang-models/yang-models/sonic-device_metadata.yang b/src/sonic-yang-models/yang-models/sonic-device_metadata.yang
index 0dc88f436d..87170850d8 100644
--- a/src/sonic-yang-models/yang-models/sonic-device_metadata.yang
+++ b/src/sonic-yang-models/yang-models/sonic-device_metadata.yang
@@ -127,6 +127,11 @@ module sonic-device_metadata {
                     type string;
                 }
 
+                leaf sub_role {
+                    type string;
+                    description "sub_role indicates if ASIC is FrondEnd or BackEnd.";
+                }
+
                 leaf downstream_subrole {
                     type string;
                 }