module policer {

    yang-version 1;
    namespace "urn:opendaylight:params:xml:ns:yang:policer";
    prefix "policer";

    description
        "VPP specific configuration of policer messages. Mapped to policer API:
         https://git.fd.io/vpp/tree/src/vnet/policer/policer.api

         Partially based on
         https://tools.ietf.org/html/draft-asechoud-netmod-qos-model-02";

    reference
        "https://docs.fd.io/vpp/17.04/clicmd_src_vnet_policer.html";

    revision "2017-03-15" {
        description "Initial revision of policer model";
    }

    import ietf-inet-types {
      prefix inet;
    }

    typedef policer-ref {
        type leafref {
            path "/policers/policer/name";
        }
        description
            "This type is used by data models that need to reference
            configured policer.";
    }

    typedef color-classfier {
        type enumeration {
            enum conform-color;
            enum exceed-color;
        }
        default conform-color;
    }

    typedef meter-type {
        type enumeration {
            enum 1r2c;
            enum 1r3c;
            enum 2r3c-2698;
            enum 2r3c-4115;
            enum 2r3c-mef5cf1;
        }
        default 1r2c;
    }

    typedef policer-round-type {
        type enumeration {
            enum closest;
            enum up;
            enum down;
        }
        default closest;
    }

    typedef policer-rate-type {
        type enumeration {
            enum kbps;
            enum pps;
        }
        default kbps;
    }

    // adapted from draft-asechoud-netmod-qos-model-02
    identity meter-action-type {
      description
        "action type in a meter";
    }

    identity meter-action-drop {
      base meter-action-type;
      description
        "drop action type in a meter";
    }

    identity meter-action-mark-dscp {
      base meter-action-type;
      description
        "dscp mark and transmit action type in a meter";
    }

    identity meter-action-transmit {
      base meter-action-type;
      description
        "transmit action type in a meter";
    }

    typedef vpp-dcsp-type {
        description
            "DSCP field values supported by VPP";
        type enumeration {
            enum CS0 {
                value 0;
            }
            enum CS1 {
                value 8;
            }
            enum AF11 {
                value 10;
            }
            enum AF12 {
                value 12;
            }
            enum AF13 {
                value 14;
            }
            enum CS2 {
                value 16;
            }
            enum AF21 {
                value 18;
            }
            enum AF22 {
                value 20;
            }
            enum AF23 {
                value 22;
            }
            enum CS3 {
                value 24;
            }
            enum AF31 {
                value 26;
            }
            enum AF32 {
                value 28;
            }
            enum AF33 {
                value 30;
            }
            enum CS4 {
                value 32;
            }
            enum AF41 {
                value 34;
            }
            enum AF42 {
                value 36;
            }
            enum AF43 {
                value 38;
            }
            enum CS5 {
                value 40;
            }
            enum EF {
                value 46;
            }
            enum CS6 {
                value 48;
            }
            enum CS7 {
                value 50;
            }
        }
        default CS0;
    }

    typedef dcsp-type {
        type union {
            type vpp-dcsp-type;
            type inet:dscp;
        }
    }

    grouping meter-action-params {
      description
        "meter action parameters";
      leaf meter-action-type {
        mandatory true;
        type identityref {
          base meter-action-type;
        }
        description
          "meter action type";
      }
      leaf dscp {
        when "../meter-action-type = meter-action-mark-dscp";
        type dcsp-type;
        description
          "dscp marking";
      }
    }

    grouping policer-base-attributes {
        leaf cir {
            type uint32;
        }
        leaf eir {
            type uint32;
        }
        leaf cb {
            type uint64;
            description "Committed Burst";
        }
        leaf eb {
            type uint64;
            description "Excess or Peak Bursnatt";
        }
        leaf rate-type {
            type policer-rate-type;
        }
        leaf round-type {
            type policer-round-type;
        }
        leaf type {
            type meter-type;
            description "policer algorithm";
        }
        leaf color-aware {
            type boolean;
        }
        container conform-action {
            uses meter-action-params;
        }
        container exceed-action {
            uses meter-action-params;
        }
        container violate-action {
            uses meter-action-params;
        }
    }

    grouping policer-operational-attributes {
        leaf single-rate {
            type boolean;
        }
        leaf scale {
            type uint32;
        }
        leaf cir-tokens-per-period {
            type uint32;
        }
        leaf pir_tokens-per-period {
            type uint32;
        }
        leaf current-limit {
            type uint32;
        }
        leaf current-bucket {
            type uint32;
        }
        leaf extended-limit {
            type uint32;
        }
        leaf extended-bucket {
            type uint32;
        }
        leaf last-update-time {
            type uint64;
        }
    }

    container policers {
        list policer {
            key name;
            leaf name {
                type string {
                    length 1..63;
                }
            }
            uses policer-base-attributes;
        }
    }

    container policers-state {
        list policer {
            key name;
            leaf name {
                type string {
                    length 1..63;
                }
            }
            uses policer-base-attributes;
            uses policer-operational-attributes;
        }
    }
}