/*
 * Copyright (c) 2016 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.
 */

#ifndef __MPLS_LABEL_DPO_H__
#define __MPLS_LABEL_DPO_H__

#include <vnet/vnet.h>
#include <vnet/mpls/packet.h>
#include <vnet/dpo/dpo.h>

/**
 * A representation of an MPLS label for imposition in the data-path
 */
typedef struct mpls_label_dpo_t
{
    /**
     * The MPLS label header to impose
     */
    mpls_unicast_header_t mld_hdr;

    /**
     * Next DPO in the graph
     */
    dpo_id_t mld_dpo;

    /**
     * Number of locks/users of the label
     */
    u16 mld_locks;
} mpls_label_dpo_t;

extern index_t mpls_label_dpo_create(mpls_label_t label,
                                     mpls_eos_bit_t eos,
                                     u8 ttl,
                                     u8 exp,
				     const dpo_id_t *dpo);

extern u8* format_mpls_label_dpo(u8 *s, va_list *args);


/*
 * Encapsulation violation for fast data-path access
 */
extern mpls_label_dpo_t *mpls_label_dpo_pool;

static inline mpls_label_dpo_t *
mpls_label_dpo_get (index_t index)
{
    return (pool_elt_at_index(mpls_label_dpo_pool, index));
}

extern void mpls_label_dpo_module_init(void);

#endif