[yang-models] Add chassis fields to device_metadata (#10006)

This change is adding asic_name, switch_id, switch_type and max_cores to sonic-device_metadata.yang
This should fix issue #9575

Co-authored-by: Maxime Lorrillere <mlorrillere@arista.com>

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -293,7 +293,11 @@
                 "hwsku": "Stone",
                 "buffer_model": "dynamic",
                 "cloudtype": "Public",
-                "region": "usfoo"
+                "region": "usfoo",
+                "asic_name": "Asic0",
+                "switch_id": "2",
+                "switch_type": "voq",
+                "max_cores": "8"
             }
         },
         "VLAN": {

src/sonic-yang-models/tests/yang_model_tests/tests/device_metadata.json

@@ -93,6 +93,13 @@
     "DEVICE_METADATA_INVALID_STORAGE_DEVICE": {
         "desc": "Verifying invalid storage device value",
         "eStrKey": "InvalidValue"
-    }
+    },
+    "DEVICE_METADATA_INCORRECT_VOQ_CONFIG": {
+        "desc": "Verifying incorrect switch_type configuration.",
+	"eStrKey": "Pattern"
+    },
+    "DEVICE_METADATA_CORRECT_VOQ_CONFIG": {
+        "desc": "Verifying VOQ configuration."
+     }
 
 }

src/sonic-yang-models/tests/yang_model_tests/tests_config/device_metadata.json

@@ -250,5 +250,29 @@
                 }
             }
         }
+    },
+    "DEVICE_METADATA_INCORRECT_VOQ_CONFIG": {
+        "sonic-device_metadata:sonic-device_metadata": {
+            "sonic-device_metadata:DEVICE_METADATA": {
+                "sonic-device_metadata:localhost": {
+                    "asic_name": "Asic0",
+                    "switch_id": "2",
+                    "switch_type": "incorrect_pattern",
+                    "max_cores": "8"
+                }
+            }
+        }
+    },
+    "DEVICE_METADATA_CORRECT_VOQ_CONFIG": {
+        "sonic-device_metadata:sonic-device_metadata": {
+            "sonic-device_metadata:DEVICE_METADATA": {
+                "sonic-device_metadata:localhost": {
+                    "asic_name": "Asic0",
+                    "switch_id": "2",
+                    "switch_type": "voq",
+                    "max_cores": "8"
+                }
+            }
+        }
     }
 }

src/sonic-yang-models/yang-models/sonic-device_metadata.yang

@@ -153,6 +153,31 @@ module sonic-device_metadata {
                 leaf storage_device {
                     type boolean;
                 }
+
+                leaf asic_name {
+                    type string;
+                    description "On a VoQ switch, the ASIC Name is used as a qualifier in global
+                                 database keys to create a system wide unique key.";
+                }
+
+                leaf switch_id {
+                    type uint16;
+                    description "Vendor specific switch ID. Identifies switch chip.";
+                }
+
+                leaf switch_type {
+                    type string {
+                        pattern "chassis-packet|fabric|npu|voq";
+                    }
+                    description "Type of switch. Default is NPU, on a VOQ switch voq is used for a regular
+                                 switching device while fabric is used for a fabric device.
+                                 chassis-packet is used for chassis in packet mode.";
+                }
+
+                leaf max_cores {
+                    type uint8;
+                    description "Maximum number of cores in a VoQ Switch (chassis).";
+                }
             }
             /* end of container localhost */
         }