module policer {

    yang-version 1;
    namespace "http://fd.io/hc2vpp/yang/policer";
    prefix "policer";

    import ietf-inet-types {
      prefix inet;
    }

    organization
        "FD.io - The Fast Data Project";

    contact
        "Hc2vpp Wiki <https://wiki.fd.io/view/Hc2vpp>
         Mailing List <hc2vpp@lists.fd.io>";

    description
        "This module contains a collection of YANG definitions for
         managing VPP policer.

         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.

         Copyright (c) 2017 Cisco and/or its affiliates.

         Licensed under the Apache License, Version 2.0 (the 'License');
         you may not use this file except in compliance with the License.
         You may obtain a copy of the License at:

         http://www.apache.org/licenses/LICENSE-2.0

         Unless required by applicable law or agreed to in writing, software
         distributed under the License is distributed on an 'AS IS' BASIS,
         WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
         See the License for the specific language governing permissions and
         limitations under the License.";

    reference
        "https://docs.fd.io/vpp/18.04/clicmd_src_vnet_policer.html";

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

    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-dscp-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 dscp-type {
        type union {
            type vpp-dscp-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 dscp-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 {
            presence "Defines conform action";
            uses meter-action-params;
        }
        container exceed-action {
            presence "Defines exceed action";
            uses meter-action-params;
        }
        container violate-action {
            presence "Defines 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;
        }
    }
}