2 * mpls_fib.h: The Label/MPLS FIB
4 * Copyright (c) 2012 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #ifndef __MPLS_FIB_TABLE_H__
19 #define __MPLS_FIB_TABLE_H__
21 #include <vnet/vnet.h>
22 #include <vnet/mpls/mpls.h>
23 #include <vnet/fib/fib_types.h>
24 #include <vnet/dpo/dpo.h>
25 #include <vnet/mpls/mpls.h>
26 #include <vnet/fib/fib_table.h>
28 #define MPLS_FIB_DEFAULT_TABLE_ID 0
31 * Type exposure is to allow the DP fast/inlined access
33 #define MPLS_FIB_KEY_SIZE 21
34 #define MPLS_FIB_DB_SIZE (1 << (MPLS_FIB_KEY_SIZE-1))
37 * There are no options for controlling the MPLS flow hash
39 #define MPLS_FLOW_HASH_DEFAULT 0
41 typedef struct mpls_fib_t_
44 * Required for pool_get_aligned
46 CLIB_CACHE_LINE_ALIGN_MARK(cacheline0);
49 * A hash table of entries. 21 bit key
50 * Hash table for reduced memory footprint
55 * The load-balance indices keyed by 21 bit label+eos bit.
56 * A flat array for maximum lookup performace.
58 index_t mf_lbs[MPLS_FIB_DB_SIZE];
61 static inline mpls_fib_t*
62 mpls_fib_get (fib_node_index_t index)
64 return (pool_elt_at_index(mpls_main.mpls_fibs, index));
67 extern u32 mpls_fib_table_find_or_create_and_lock(u32 table_id,
69 extern u32 mpls_fib_table_create_and_lock(fib_source_t src);
70 // extern mpls_fib_t * mpls_fib_find(u32 table_id);
71 extern u32 mpls_fib_index_from_table_id(u32 table_id);
73 extern u8 *format_mpls_fib_table_name(u8 * s, va_list * args);
75 extern fib_node_index_t mpls_fib_table_entry_add_from_ip_fib_entry (
79 fib_node_index_t fib_entry_index);
82 extern fib_node_index_t mpls_fib_table_lookup(const mpls_fib_t *mf,
86 extern void mpls_fib_table_entry_remove(mpls_fib_t *mf,
89 extern void mpls_fib_table_entry_insert(mpls_fib_t *mf,
92 fib_node_index_t fei);
93 extern void mpls_fib_table_destroy(u32 fib_index);
96 extern void mpls_fib_forwarding_table_update(mpls_fib_t *mf,
100 extern void mpls_fib_forwarding_table_reset(mpls_fib_t *mf,
105 * @brief Walk all entries in a FIB table
106 * N.B: This is NOT safe to deletes. If you need to delete walk the whole
107 * table and store elements in a vector, then delete the elements
109 extern void mpls_fib_table_walk(mpls_fib_t *fib,
110 fib_table_walk_fn_t fn,
113 extern u8 *format_mpls_fib_table_memory(u8 * s, va_list * args);
117 * Lookup a label and EOS bit in the MPLS_FIB table to retrieve the
118 * load-balance index to be used for packet forwarding.
120 static inline index_t
121 mpls_fib_table_forwarding_lookup (u32 mpls_fib_index,
122 const mpls_unicast_header_t *hdr)
128 label = clib_net_to_host_u32(hdr->label_exp_s_ttl);
129 key = (vnet_mpls_uc_get_label(label) << 1) | vnet_mpls_uc_get_s(label);
131 mf = mpls_fib_get(mpls_fib_index);
133 return (mf->mf_lbs[key]);
137 mpls_fib_table_get_index_for_sw_if_index (u32 sw_if_index)
139 mpls_main_t *mm = &mpls_main;
141 ASSERT(vec_len(mm->fib_index_by_sw_if_index) > sw_if_index);
143 return (mm->fib_index_by_sw_if_index[sw_if_index]);