[yang] Add support for smart switch in dhcp_server_ipv4 (#17320)

src/sonic-yang-models/tests/yang_model_tests/tests/dhcp_server_ipv4.json

@@ -4,7 +4,7 @@
     },
     "DHCP_SERVER_IPV4_WITH_INVALID_VLAN": {
         "desc": "Configure vlan-id in DHCP_SERVER_IPV4 table which is invalid.",
-        "eStrKey" : "Pattern"
+        "eStrKey" : "InvalidValue"
     },
     "DHCP_SERVER_IPV4_INCORRECT_GATEWAY": {
         "desc": "Add gateway which is not in correct ip-prefix format.",
@@ -22,6 +22,10 @@
         "desc": "Configure wrong value for mode.",
         "eStrKey": "InvalidValue"
     },
+    "DHCP_SERVER_IPV4_WITH_NON_EXIST_BRIDGE": {
+        "desc": "Configure bridge in DHCP_SERVER_IPV4 table which does not exist in MID_PLANE_BRIDGE table.",
+        "eStrKey": "InvalidValue"
+    },
     "DHCP_SREVER_IPV4_NON_EXIST_OPTION": {
         "desc": "Configure option in DHCP_SERVER_IPV4 table which does not exist in DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS table.",
         "eStrKey": "LeafRef"
@@ -35,6 +39,10 @@
         "eStrKey": "InvalidValue",
         "eStr": ["type"]
     },
+    "DHCP_SERVER_IPV4_PORT_WITH_NO_EXIST_PORT": {
+        "desc": "Configure DHCP port in DHCP_SERVER_IPV4_PORT table which is no exist.",
+        "eStrKey": "InvalidValue"
+    },
     "DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS_TYPE_VALID_VALUE_TEXT": {
         "desc": "Add text type of DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS."
     },

src/sonic-yang-models/tests/yang_model_tests/tests_config/dhcp_server_ipv4.json

@@ -1,5 +1,13 @@
 {
     "DHCP_SERVER_IPV4_VALID_FORMAT": {
+        "sonic-smart-switch:sonic-smart-switch": {
+            "sonic-smart-switch:MID_PLANE_BRIDGE": {
+                "GLOBAL": {
+                    "bridge": "bridge_midplane",
+                    "ip_prefix": "169.254.200.254/24"
+                }
+            }
+        },
         "sonic-portchannel:sonic-portchannel": {
             "sonic-portchannel:PORTCHANNEL": {
                 "PORTCHANNEL_LIST": [
@@ -38,6 +46,14 @@
                             "option60"
                         ],
                         "state": "enabled"
+                    },
+                    {
+                        "name": "bridge_midplane",
+                        "gateway": "169.254.200.254",
+                        "lease_time": 3600,
+                        "mode": "PORT",
+                        "netmask": "255.255.255.0",
+                        "state": "enabled"
                     }
                 ]
             },
@@ -164,6 +180,30 @@
             }
         }
     },
+    "DHCP_SERVER_IPV4_WITH_NON_EXIST_BRIDGE": {
+        "sonic-smart-switch:sonic-smart-switch": {
+            "sonic-smart-switch:MID_PLANE_BRIDGE": {
+                "GLOBAL": {
+                    "bridge": "bridge_midplane",
+                    "ip_prefix": "169.254.200.254/24"
+                }
+            }
+        },
+        "sonic-dhcp-server-ipv4:sonic-dhcp-server-ipv4": {
+            "sonic-dhcp-server-ipv4:DHCP_SERVER_IPV4": {
+                "DHCP_SERVER_IPV4_LIST": [
+                    {
+                        "name": "non_exist_bridge_midplane",
+                        "gateway": "192.168.0.1",
+                        "lease_time": 3600,
+                        "mode": "PORT",
+                        "netmask": "255.255.255.0",
+                        "state": "enabled"
+                    }
+                ]
+            }
+        }
+    },
     "DHCP_SREVER_IPV4_NON_EXIST_OPTION": {
         "sonic-dhcp-server-ipv4:sonic-dhcp-server-ipv4": {
             "sonic-dhcp-server-ipv4:DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS": {
@@ -248,6 +288,41 @@
             }
         }
     },
+    "DHCP_SERVER_IPV4_PORT_WITH_NO_EXIST_PORT": {
+        "sonic-smart-switch:sonic-smart-switch": {
+            "sonic-smart-switch:MID_PLANE_BRIDGE": {
+                "GLOBAL": {
+                    "bridge": "bridge_midplane",
+                    "ip_prefix": "169.254.200.254/24"
+                }
+            }
+        },
+        "sonic-dhcp-server-ipv4:sonic-dhcp-server-ipv4": {
+            "sonic-dhcp-server-ipv4:DHCP_SERVER_IPV4": {
+                "DHCP_SERVER_IPV4_LIST": [
+                    {
+                        "name": "bridge_midplane",
+                        "gateway": "169.254.200.254",
+                        "lease_time": 3600,
+                        "mode": "PORT",
+                        "netmask": "255.255.255.0",
+                        "state": "enabled"
+                    }
+                ]
+            },
+            "sonic-dhcp-server-ipv4:DHCP_SERVER_IPV4_PORT": {
+                "DHCP_SERVER_IPV4_PORT_LIST": [
+                    {
+                        "name": "bridge_midplane",
+                        "port": "non_exit_dpu",
+                        "ips": [
+                            "169.254.200.1"
+                        ]
+                    }
+                ]
+            }
+        }
+    },
     "DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS_TYPE_VALID_VALUE_TEXT": {
         "sonic-dhcp-server-ipv4:sonic-dhcp-server-ipv4": {
             "sonic-dhcp-server-ipv4:DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS": {

src/sonic-yang-models/yang-models/sonic-dhcp-server-ipv4.yang

@@ -27,6 +27,10 @@ module sonic-dhcp-server-ipv4 {
         prefix lag;
     }
 
+    import sonic-smart-switch {
+        prefix smartswitch;
+    }
+
     description "DHCP_SERVER_IPV4 YANG module for SONiC OS";
 
     revision 2023-07-19 {
@@ -46,6 +50,7 @@ module sonic-dhcp-server-ipv4 {
 
                 leaf name {
                     description "Interface name for DHCP server";
+                    type union {
                         // Comment VLAN leaf reference here until libyang back-links issue is resolved and use VLAN string pattern
                         // type leafref {
                         //     path "/vlan:sonic-vlan/vlan:VLAN/vlan:VLAN_LIST/vlan:name";
@@ -53,6 +58,10 @@ module sonic-dhcp-server-ipv4 {
                         type string {
                             pattern 'Vlan([0-9]{1,3}|[1-3][0-9]{3}|[4][0][0-8][0-9]|[4][0][9][0-4])';
                         }
+                        type leafref {
+                            path "/smartswitch:sonic-smart-switch/smartswitch:MID_PLANE_BRIDGE/smartswitch:GLOBAL/smartswitch:bridge";
+                        }
+                    }
                 }
 
                 leaf gateway {
@@ -204,7 +213,7 @@ module sonic-dhcp-server-ipv4 {
                 }
 
                 leaf port {
-                    description "Interface under vlan";
+                    description "Interface under DHCP interface";
                     type union {
                         type leafref {
                             path "/port:sonic-port/port:PORT/port:PORT_LIST/port:name";
@@ -212,6 +221,9 @@ module sonic-dhcp-server-ipv4 {
                         type leafref {
                             path "/lag:sonic-portchannel/lag:PORTCHANNEL/lag:PORTCHANNEL_LIST/lag:name";
                         }
+                        type leafref {
+                            path "/smartswitch:sonic-smart-switch/smartswitch:DPUS/smartswitch:DPUS_LIST/smartswitch:midplane_interface";
+                        }
                     }
                 }