2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef __FIB_NODE_H__
17 #define __FIB_NODE_H__
19 #include <vnet/fib/fib_types.h>
22 * The types of nodes in a FIB graph
24 typedef enum fib_node_type_t_ {
26 * Marker. New types after this one.
28 FIB_NODE_TYPE_FIRST = 0,
30 * See the respective fib_*.h files for descriptions of these objects.
34 FIB_NODE_TYPE_MFIB_ENTRY,
35 FIB_NODE_TYPE_PATH_LIST,
38 FIB_NODE_TYPE_MPLS_ENTRY,
39 FIB_NODE_TYPE_MPLS_TUNNEL,
40 FIB_NODE_TYPE_LISP_GPE_FWD_ENTRY,
41 FIB_NODE_TYPE_LISP_ADJ,
42 FIB_NODE_TYPE_GRE_TUNNEL,
43 FIB_NODE_TYPE_VXLAN_TUNNEL,
45 FIB_NODE_TYPE_VXLAN_GPE_TUNNEL,
46 FIB_NODE_TYPE_GENEVE_TUNNEL,
47 FIB_NODE_TYPE_UDP_ENCAP,
48 FIB_NODE_TYPE_BIER_FMASK,
49 FIB_NODE_TYPE_BIER_ENTRY,
50 FIB_NODE_TYPE_VXLAN_GBP_TUNNEL,
52 * Marker. New types before this one. leave the test last.
55 FIB_NODE_TYPE_LAST = FIB_NODE_TYPE_TEST,
56 } __attribute__ ((packed)) fib_node_type_t;
58 #define FIB_NODE_TYPE_MAX (FIB_NODE_TYPE_LAST + 1)
60 #define FIB_NODE_TYPES { \
61 [FIB_NODE_TYPE_ENTRY] = "entry", \
62 [FIB_NODE_TYPE_MFIB_ENTRY] = "mfib-entry", \
63 [FIB_NODE_TYPE_WALK] = "walk", \
64 [FIB_NODE_TYPE_PATH_LIST] = "path-list", \
65 [FIB_NODE_TYPE_PATH] = "path", \
66 [FIB_NODE_TYPE_MPLS_ENTRY] = "mpls-entry", \
67 [FIB_NODE_TYPE_MPLS_TUNNEL] = "mpls-tunnel", \
68 [FIB_NODE_TYPE_ADJ] = "adj", \
69 [FIB_NODE_TYPE_LISP_GPE_FWD_ENTRY] = "lisp-gpe-fwd-entry", \
70 [FIB_NODE_TYPE_LISP_ADJ] = "lisp-adj", \
71 [FIB_NODE_TYPE_GRE_TUNNEL] = "gre-tunnel", \
72 [FIB_NODE_TYPE_VXLAN_TUNNEL] = "vxlan-tunnel", \
73 [FIB_NODE_TYPE_MAP_E] = "map-e", \
74 [FIB_NODE_TYPE_VXLAN_GPE_TUNNEL] = "vxlan-gpe-tunnel", \
75 [FIB_NODE_TYPE_UDP_ENCAP] = "udp-encap", \
76 [FIB_NODE_TYPE_BIER_FMASK] = "bier-fmask", \
77 [FIB_NODE_TYPE_BIER_ENTRY] = "bier-entry", \
78 [FIB_NODE_TYPE_VXLAN_GBP_TUNNEL] = "vxlan-gbp-tunnel" \
82 * Reasons for backwalking the FIB object graph
84 typedef enum fib_node_back_walk_reason_t_ {
86 * Marker. Add new ones after.
88 FIB_NODE_BW_REASON_FIRST = 0,
90 * Walk to re-resolve the child.
91 * Used when the parent is no longer a valid resolution target
93 FIB_NODE_BW_REASON_RESOLVE = FIB_NODE_BW_REASON_FIRST,
95 * Walk to re-evaluate the forwarding contributed by the parent.
96 * Used when a parent's forwarding changes and the child needs to
97 * incorporate this change in its forwarding.
99 FIB_NODE_BW_REASON_EVALUATE,
101 * A resolving interface has come up
103 FIB_NODE_BW_REASON_INTERFACE_UP,
105 * A resolving interface has gone down
107 FIB_NODE_BW_REASON_INTERFACE_DOWN,
109 * A resolving interface has been deleted.
111 FIB_NODE_BW_REASON_INTERFACE_DELETE,
113 * Walk to re-collapse the multipath adjs when the rewrite of
114 * a unipath adjacency changes
116 FIB_NODE_BW_REASON_ADJ_UPDATE,
118 * Walk to update children to inform them the adjacency is now down.
120 FIB_NODE_BW_REASON_ADJ_DOWN,
122 * Marker. Add new before and update
124 FIB_NODE_BW_REASON_LAST = FIB_NODE_BW_REASON_ADJ_DOWN,
125 } fib_node_back_walk_reason_t;
127 #define FIB_NODE_BW_REASONS { \
128 [FIB_NODE_BW_REASON_RESOLVE] = "resolve", \
129 [FIB_NODE_BW_REASON_EVALUATE] = "evaluate", \
130 [FIB_NODE_BW_REASON_INTERFACE_UP] = "if-up", \
131 [FIB_NODE_BW_REASON_INTERFACE_DOWN] = "if-down", \
132 [FIB_NODE_BW_REASON_INTERFACE_DELETE] = "if-delete", \
133 [FIB_NODE_BW_REASON_ADJ_UPDATE] = "adj-update", \
134 [FIB_NODE_BW_REASON_ADJ_DOWN] = "adj-down", \
137 #define FOR_EACH_FIB_NODE_BW_REASON(_item) \
138 for (_item = FIB_NODE_BW_REASON_FIRST; \
139 _item <= FIB_NODE_BW_REASON_LAST; \
143 * Flags enum constructed from the reaons
145 typedef enum fib_node_bw_reason_flag_t_ {
146 FIB_NODE_BW_REASON_FLAG_NONE = 0,
147 FIB_NODE_BW_REASON_FLAG_RESOLVE = (1 << FIB_NODE_BW_REASON_RESOLVE),
148 FIB_NODE_BW_REASON_FLAG_EVALUATE = (1 << FIB_NODE_BW_REASON_EVALUATE),
149 FIB_NODE_BW_REASON_FLAG_INTERFACE_UP = (1 << FIB_NODE_BW_REASON_INTERFACE_UP),
150 FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN = (1 << FIB_NODE_BW_REASON_INTERFACE_DOWN),
151 FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE = (1 << FIB_NODE_BW_REASON_INTERFACE_DELETE),
152 FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE = (1 << FIB_NODE_BW_REASON_ADJ_UPDATE),
153 FIB_NODE_BW_REASON_FLAG_ADJ_DOWN = (1 << FIB_NODE_BW_REASON_ADJ_DOWN),
154 } __attribute__ ((packed)) fib_node_bw_reason_flag_t;
156 STATIC_ASSERT(sizeof(fib_node_bw_reason_flag_t) < 2,
157 "BW Reason enum < 2 byte. Consequences for cover_upd_res_t");
159 extern u8 *format_fib_node_bw_reason(u8 *s, va_list *args);
164 typedef enum fib_node_bw_flags_t_
166 FIB_NODE_BW_FLAG_NONE = 0,
168 * Force the walk to be synchronous
170 FIB_NODE_BW_FLAG_FORCE_SYNC = (1 << 0),
171 } fib_node_bw_flags_t;
174 * Forward eclarations
179 * A representation of one pointer to another node.
180 * To fully qualify a node, one must know its type and its index so it
181 * can be retrieved from the appropriate pool. Direct pointers to nodes
182 * are forbidden, since all nodes are allocated from pools, which are vectors,
183 * and thus subject to realloc at any time.
185 typedef struct fib_node_ptr_t_ {
189 fib_node_type_t fnp_type;
193 fib_node_index_t fnp_index;
197 * @brief A list of FIB nodes.
199 typedef u32 fib_node_list_t;
202 * Context passed between object during a back walk.
204 typedef struct fib_node_back_walk_ctx_t_ {
206 * The reason/trigger for the backwalk
208 fib_node_bw_reason_flag_t fnbw_reason;
211 * additional flags for the walk
213 fib_node_bw_flags_t fnbw_flags;
216 * the number of levels the walk has already traversed.
217 * this value is maintained by the walk infra, tp limit the depth of
218 * a walk so it does not run indefinately the presence of a loop/cycle
222 } fib_node_back_walk_ctx_t;
225 * We consider a depth of 32 to be sufficient to cover all sane
226 * network topologies. Anything more is then an indication that
227 * there is a loop/cycle in the FIB graph.
228 * Note that all object types contribute to 1 to the depth.
230 #define FIB_NODE_GRAPH_MAX_DEPTH ((u32)32)
233 * A callback function for walking a node dependency list
235 typedef int (*fib_node_ptr_walk_t)(fib_node_ptr_t *depend,
239 * A list of dependent nodes.
240 * This is currently implemented as a hash_table of fib_node_ptr_t
242 typedef fib_node_ptr_t fib_node_ptr_list_t;
245 * Return code from a back walk function
247 typedef enum fib_node_back_walk_rc_t_ {
248 FIB_NODE_BACK_WALK_MERGE,
249 FIB_NODE_BACK_WALK_CONTINUE,
250 } fib_node_back_walk_rc_t;
253 * Function definition to backwalk a FIB node
255 typedef fib_node_back_walk_rc_t (*fib_node_back_walk_t)(
256 struct fib_node_t_ *node,
257 fib_node_back_walk_ctx_t *ctx);
260 * Function definition to get a FIB node from its index
262 typedef struct fib_node_t_* (*fib_node_get_t)(fib_node_index_t index);
265 * Function definition to inform the FIB node that its last lock has gone.
267 typedef void (*fib_node_last_lock_gone_t)(struct fib_node_t_ *node);
270 * Function definition to display the amount of memory used by a type.
271 * Implementations should call fib_show_memory_usage()
273 typedef void (*fib_node_memory_show_t)(void);
276 * A FIB graph nodes virtual function table
278 typedef struct fib_node_vft_t_ {
279 fib_node_get_t fnv_get;
280 fib_node_last_lock_gone_t fnv_last_lock;
281 fib_node_back_walk_t fnv_back_walk;
282 format_function_t *fnv_format;
283 fib_node_memory_show_t fnv_mem_show;
287 * An node in the FIB graph
289 * Objects in the FIB form a graph.
291 typedef struct fib_node_t_ {
293 * The node's type. make sure we are dynamic/down casting correctly
295 fib_node_type_t fn_type;
298 * Some pad space the concrete/derived type is free to use
303 * Vector of nodes that depend upon/use/share this node
305 fib_node_list_t fn_children;
308 * Number of dependents on this node. This number includes the number
314 STATIC_ASSERT(sizeof(fib_node_t) == 12, "FIB node type is growing");
318 * Register the function table for a given type
324 * virtual function table
326 extern void fib_node_register_type (fib_node_type_t ft,
327 const fib_node_vft_t *vft);
331 * Create a new FIB node type and Register the function table for it.
334 * virtual function table
336 * @return new FIB node type
338 extern fib_node_type_t fib_node_register_new_type (const fib_node_vft_t *vft);
341 * @brief Show the memory usage for a type
343 * This should be invoked by the type in response to the infra calling
344 * its registered memory show function
346 * @param name the name of the type
347 * @param in_use_elts The number of elements in use
348 * @param allocd_elts The number of allocated pool elemenets
349 * @param size_elt The size of one element
351 extern void fib_show_memory_usage(const char *name,
356 extern void fib_node_init(fib_node_t *node,
358 extern void fib_node_deinit(fib_node_t *node);
360 extern void fib_node_lock(fib_node_t *node);
361 extern void fib_node_unlock(fib_node_t *node);
363 extern u32 fib_node_get_n_children(fib_node_type_t parent_type,
364 fib_node_index_t parent_index);
365 extern u32 fib_node_child_add(fib_node_type_t parent_type,
366 fib_node_index_t parent_index,
367 fib_node_type_t child_type,
368 fib_node_index_t child_index);
369 extern void fib_node_child_remove(fib_node_type_t parent_type,
370 fib_node_index_t parent_index,
371 fib_node_index_t sibling_index);
373 extern fib_node_back_walk_rc_t fib_node_back_walk_one(fib_node_ptr_t *ptr,
374 fib_node_back_walk_ctx_t *ctx);
376 extern u8* fib_node_children_format(fib_node_list_t list,
379 extern const char* fib_node_type_get_name(fib_node_type_t type);
382 fib_node_index_is_valid (fib_node_index_t ni)
384 return (FIB_NODE_INDEX_INVALID != ni);