/* * 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> /** * Flags present on an MPLS label sourced path-extension */ typedef enum mpls_label_dpo_attr_t_ { /** * Do not decrement the TTL of IP packet during imposition */ MPLS_LABEL_DPO_ATTR_NO_IP_TTL_DECR, MPLS_LABEL_DPO_ATTR_UNIFORM_MODE, } mpls_label_dpo_attr_t; #define MPLS_LABEL_DPO_ATTR_MAX (MPLS_LABEL_DPO_ATTR_UNIFORM_MODE+1) typedef enum mpls_label_dpo_flags_t_ { MPLS_LABEL_DPO_FLAG_NONE = 0, MPLS_LABEL_DPO_FLAG_NO_IP_TTL_DECR = (1 << MPLS_LABEL_DPO_ATTR_NO_IP_TTL_DECR), MPLS_LABEL_DPO_FLAG_UNIFORM_MODE = (1 << MPLS_LABEL_DPO_ATTR_UNIFORM_MODE), } __attribute__ ((packed)) mpls_label_dpo_flags_t; #define MPLS_LABEL_DPO_ATTR_NAMES { \ [MPLS_LABEL_DPO_ATTR_NO_IP_TTL_DECR] = "no-ip-tll-decr", \ [MPLS_LABEL_DPO_ATTR_UNIFORM_MODE] = "uniform-mode", \ } #define FOR_EACH_MPLS_LABEL_DPO_ATTR(_item) \ for (_item = MPLS_LABEL_DPO_ATTR_NO_IP_TTL_DECR; \ _item <= MPLS_LABEL_DPO_ATTR_UNIFORM_MODE; \ _item++) /** * Format the flags variable */ extern u8* format_mpls_label_dpo_flags(u8 *s, va_list *args); /** * 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 { /** * required for pool_get_aligned. * memebers used in the switch path come first! */ CLIB_CACHE_LINE_ALIGN_MARK(cacheline0); /** * 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; /** * Flags */ mpls_label_dpo_flags_t mld_flags; /** * Size of the label stack */ u8 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 payload_proto The ptocool of the payload packets that will * be imposed with this label header. * @param parent The parent of the created MPLS label object * @param dpo The MPLS label DPO created */ extern void mpls_label_dpo_create(fib_mpls_label_t *label_stack, mpls_eos_bit_t eos, dpo_proto_t payload_proto, mpls_label_dpo_flags_t flags, const dpo_id_t *paremt, 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); /* * test function to get the registered DPO type for the flags */ extern dpo_type_t mpls_label_dpo_get_type(mpls_label_dpo_flags_t flags); #endif