Add yang model for scheduler in PORT_QOS_MAP (#16244)

Signed-off-by: Stephen Sun <stephens@nvidia.com>

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

@@ -1898,6 +1898,15 @@
                 "pbs": "2048",
                 "pir": "2560000",
                 "type": "STRICT"
+            },
+            "port_scheduler": {
+                "cbs": "256",
+                "cir": "1250000",
+                "meter_type": "bytes",
+                "pbs": "1024",
+                "pir": "25000000",
+                "type": "DWRR",
+                "weight": "10"
             }
 	},
 
@@ -2069,7 +2078,8 @@
                "pfc_to_queue_map": "pfc_prio_to_q_map1",
                "pfc_to_pg_map"   : "pfc_prio_to_pg_map1",
                "pfc_enable"      : "3,4",
-	          "pfcwd_sw_enable" : "3,4"
+               "pfcwd_sw_enable" : "3,4",
+               "scheduler"       : "port_scheduler"
             },
             "Ethernet4": {
               "dot1p_to_tc_map" : "Dot1p_to_tc_map2",

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

@@ -96,6 +96,11 @@
         "eStrKey": "LeafRef"
     },
 
+    "PORT_QOS_MAP_APPLY_NON_EXISTS_SCHEDULER": {
+        "desc": "Configure non exists scheduler on port.",
+        "eStrKey": "LeafRef"
+    },
+
     "PORT_QOS_MAP_APPLY_NON_EXISTS_PORT": {
         "desc": "Configure port qos map entry on non exists port.",
         "eStr": "Invalid value"

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

@@ -657,6 +657,24 @@
                 ]
             }
         },
+
+        "sonic-scheduler:sonic-scheduler":{
+            "sonic-scheduler:SCHEDULER": {
+                "SCHEDULER_LIST": [
+                {
+                    "name":"port_scheduler",
+                    "cbs": "256",
+                    "cir": "1250000",
+                    "meter_type": "bytes",
+                    "pbs": "1024",
+                    "pir": "25000000",
+                    "type": "DWRR",
+                    "weight": "10"
+                }
+                ]
+            }
+        },
+
         "sonic-port-qos-map:sonic-port-qos-map": {
             "sonic-port-qos-map:PORT_QOS_MAP": {
                 "PORT_QOS_MAP_LIST": [
@@ -670,7 +688,8 @@
                         "dscp_to_tc_map": "map1",
                         "dot1p_to_tc_map": "map1",
                         "pfc_enable": "2,3,4,6",
-                        "pfcwd_sw_enable" : "2,3,4,6"
+                        "pfcwd_sw_enable" : "2,3,4,6",
+                        "scheduler" : "port_scheduler"
                     }
                 ]
             }
@@ -751,6 +770,35 @@
         }
     },
 
+    "PORT_QOS_MAP_APPLY_NON_EXISTS_SCHEDULER": {
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                {
+                    "admin_status": "up",
+                    "alias": "eth0",
+                    "description": "Ethernet0",
+                    "lanes": "65",
+                    "mtu": "9000",
+                    "name": "Ethernet0",
+                    "tpid": "0x8100",
+                    "speed": "25000"
+                }
+                ]
+            }
+        },
+        "sonic-port-qos-map:sonic-port-qos-map": {
+            "sonic-port-qos-map:PORT_QOS_MAP": {
+                "PORT_QOS_MAP_LIST": [
+                    {
+                        "ifname": "Ethernet0",
+                        "scheduler": "scheduler1"
+                    }
+                ]
+            }
+        }
+    },
+
      "PORT_QOS_MAP_APPLY_NON_EXISTS_PORT": {
         "sonic-port:sonic-port": {
             "sonic-port:PORT": {

src/sonic-yang-models/yang-models/sonic-port-qos-map.yang

@@ -34,6 +34,10 @@ module sonic-port-qos-map {
         prefix dot1ptm;
     }
 
+    import sonic-scheduler {
+        prefix sch;
+    }
+
     organization
         "SONiC";
 
@@ -117,6 +121,13 @@ module sonic-port-qos-map {
                         path "/dot1ptm:sonic-dot1p-tc-map/dot1ptm:DOT1P_TO_TC_MAP/dot1ptm:DOT1P_TO_TC_MAP_LIST/dot1ptm:name";
                     }
                 }
+
+                leaf scheduler {
+                    type leafref {
+                        path "/sch:sonic-scheduler/sch:SCHEDULER/sch:SCHEDULER_LIST/sch:name"; //Reference to SCHEDULER table
+                    }
+                    description "Scheduler for port.";
+                }
             }
         }
     }