/* * 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