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/*
* 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>
/**
* Maximum number of labels in one DPO
*/
#define MPLS_LABEL_DPO_MAX_N_LABELS 12
/**
* A representation of an MPLS label for imposition in the data-path
*/
typedef struct mpls_label_dpo_t
{
/**
* The MPLS label header to impose. Outer most label first.
* Each DPO will occupy one cache line, stuff that many labels in.
*/
mpls_unicast_header_t mld_hdr[MPLS_LABEL_DPO_MAX_N_LABELS];
/**
* Next DPO in the graph
*/
dpo_id_t mld_dpo;
/**
* The protocol of the payload/packets that are being encapped
*/
dpo_proto_t mld_payload_proto;
/**
* Size of the label stack
*/
u16 mld_n_labels;
/**
* Cached amount of header bytes to paint
*/
u16 mld_n_hdr_bytes;
/**
* Number of locks/users of the label
*/
u16 mld_locks;
} mpls_label_dpo_t;
/**
* @brief Assert that the MPLS label object is less than a cache line in size.
* Should this get any bigger then we will need to reconsider how many labels
* can be pushed in one object.
*/
STATIC_ASSERT((sizeof(mpls_label_dpo_t) <= CLIB_CACHE_LINE_BYTES),
"MPLS label DPO is larger than one cache line.");
/**
* @brief Create an MPLS label object
*
* @param label_stack The stack if labels to impose, outer most label first
* @param eos The inner most label's EOS bit
* @param ttl The inner most label's TTL bit
* @param exp The inner most label's EXP bit
* @param payload_proto The ptocool of the payload packets that will
* be imposed with this label header.
* @param dpo The parent of the created MPLS label object
*/
extern index_t mpls_label_dpo_create(mpls_label_t *label_stack,
mpls_eos_bit_t eos,
u8 ttl,
u8 exp,
dpo_proto_t payload_proto,
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
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