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fib_node.h
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 
16 #ifndef __FIB_NODE_H__
17 #define __FIB_NODE_H__
18 
19 #include <vnet/fib/fib_types.h>
20 
21 /**
22  * The types of nodes in a FIB graph
23  */
24 typedef enum fib_node_type_t_ {
25  /**
26  * Marker. New types after this one.
27  */
29  /**
30  * See the respective fib_*.h files for descriptions of these objects.
31  */
50  /**
51  * Marker. New types before this one. leave the test last.
52  */
55 } __attribute__ ((packed)) fib_node_type_t;
56 
57 #define FIB_NODE_TYPE_MAX (FIB_NODE_TYPE_LAST + 1)
58 
59 #define FIB_NODE_TYPES { \
60  [FIB_NODE_TYPE_ENTRY] = "entry", \
61  [FIB_NODE_TYPE_MFIB_ENTRY] = "mfib-entry", \
62  [FIB_NODE_TYPE_WALK] = "walk", \
63  [FIB_NODE_TYPE_PATH_LIST] = "path-list", \
64  [FIB_NODE_TYPE_PATH] = "path", \
65  [FIB_NODE_TYPE_MPLS_ENTRY] = "mpls-entry", \
66  [FIB_NODE_TYPE_MPLS_TUNNEL] = "mpls-tunnel", \
67  [FIB_NODE_TYPE_ADJ] = "adj", \
68  [FIB_NODE_TYPE_LISP_GPE_FWD_ENTRY] = "lisp-gpe-fwd-entry", \
69  [FIB_NODE_TYPE_LISP_ADJ] = "lisp-adj", \
70  [FIB_NODE_TYPE_GRE_TUNNEL] = "gre-tunnel", \
71  [FIB_NODE_TYPE_VXLAN_TUNNEL] = "vxlan-tunnel", \
72  [FIB_NODE_TYPE_MAP_E] = "map-e", \
73  [FIB_NODE_TYPE_VXLAN_GPE_TUNNEL] = "vxlan-gpe-tunnel", \
74  [FIB_NODE_TYPE_UDP_ENCAP] = "udp-encap", \
75  [FIB_NODE_TYPE_BIER_FMASK] = "bier-fmask", \
76  [FIB_NODE_TYPE_BIER_ENTRY] = "bier-entry", \
77 }
78 
79 /**
80  * Reasons for backwalking the FIB object graph
81  */
83  /**
84  * Marker. Add new ones after.
85  */
87  /**
88  * Walk to re-resolve the child.
89  * Used when the parent is no longer a valid resolution target
90  */
92  /**
93  * Walk to re-evaluate the forwarding contributed by the parent.
94  * Used when a parent's forwarding changes and the child needs to
95  * incorporate this change in its forwarding.
96  */
98  /**
99  * A resolving interface has come up
100  */
102  /**
103  * A resolving interface has gone down
104  */
106  /**
107  * A resolving interface has been deleted.
108  */
110  /**
111  * Walk to re-collapse the multipath adjs when the rewrite of
112  * a unipath adjacency changes
113  */
115  /**
116  * Walk to update children to inform them the adjacency is now down.
117  */
119  /**
120  * Marker. Add new before and update
121  */
124 
125 #define FIB_NODE_BW_REASONS { \
126  [FIB_NODE_BW_REASON_RESOLVE] = "resolve", \
127  [FIB_NODE_BW_REASON_EVALUATE] = "evaluate", \
128  [FIB_NODE_BW_REASON_INTERFACE_UP] = "if-up", \
129  [FIB_NODE_BW_REASON_INTERFACE_DOWN] = "if-down", \
130  [FIB_NODE_BW_REASON_INTERFACE_DELETE] = "if-delete", \
131  [FIB_NODE_BW_REASON_ADJ_UPDATE] = "adj-update", \
132  [FIB_NODE_BW_REASON_ADJ_DOWN] = "adj-down", \
133 }
134 
135 #define FOR_EACH_FIB_NODE_BW_REASON(_item) \
136  for (_item = FIB_NODE_BW_REASON_FIRST; \
137  _item <= FIB_NODE_BW_REASON_LAST; \
138  _item++)
139 
140 /**
141  * Flags enum constructed from the reaons
142  */
152 } __attribute__ ((packed)) fib_node_bw_reason_flag_t;
153 
155  "BW Reason enum < 2 byte. Consequences for cover_upd_res_t");
156 
157 /**
158  * Flags on the walk
159  */
161 {
163  /**
164  * Force the walk to be synchronous
165  */
168 
169 /**
170  * Forward eclarations
171  */
172 struct fib_node_t_;
173 
174 /**
175  * A representation of one pointer to another node.
176  * To fully qualify a node, one must know its type and its index so it
177  * can be retrieved from the appropriate pool. Direct pointers to nodes
178  * are forbidden, since all nodes are allocated from pools, which are vectors,
179  * and thus subject to realloc at any time.
180  */
181 typedef struct fib_node_ptr_t_ {
182  /**
183  * node type
184  */
185  fib_node_type_t fnp_type;
186  /**
187  * node's index
188  */
191 
192 /**
193  * @brief A list of FIB nodes.
194  */
196 
197 /**
198  * Context passed between object during a back walk.
199  */
201  /**
202  * The reason/trigger for the backwalk
203  */
205 
206  /**
207  * additional flags for the walk
208  */
210 
211  /**
212  * the number of levels the walk has already traversed.
213  * this value is maintained by the walk infra, tp limit the depth of
214  * a walk so it does not run indefinately the presence of a loop/cycle
215  * in the graph.
216  */
219 
220 /**
221  * We consider a depth of 32 to be sufficient to cover all sane
222  * network topologies. Anything more is then an indication that
223  * there is a loop/cycle in the FIB graph.
224  * Note that all object types contribute to 1 to the depth.
225  */
226 #define FIB_NODE_GRAPH_MAX_DEPTH ((u32)32)
227 
228 /**
229  * A callback function for walking a node dependency list
230  */
231 typedef int (*fib_node_ptr_walk_t)(fib_node_ptr_t *depend,
232  void *ctx);
233 
234 /**
235  * A list of dependent nodes.
236  * This is currently implemented as a hash_table of fib_node_ptr_t
237  */
239 
240 /**
241  * Return code from a back walk function
242  */
247 
248 /**
249  * Function definition to backwalk a FIB node
250  */
252  struct fib_node_t_ *node,
254 
255 /**
256  * Function definition to get a FIB node from its index
257  */
258 typedef struct fib_node_t_* (*fib_node_get_t)(fib_node_index_t index);
259 
260 /**
261  * Function definition to inform the FIB node that its last lock has gone.
262  */
263 typedef void (*fib_node_last_lock_gone_t)(struct fib_node_t_ *node);
264 
265 /**
266  * Function definition to display the amount of memory used by a type.
267  * Implementations should call fib_show_memory_usage()
268  */
269 typedef void (*fib_node_memory_show_t)(void);
270 
271 /**
272  * A FIB graph nodes virtual function table
273  */
274 typedef struct fib_node_vft_t_ {
281 
282 /**
283  * An node in the FIB graph
284  *
285  * Objects in the FIB form a graph.
286  */
287 typedef struct fib_node_t_ {
288  /**
289  * The node's type. make sure we are dynamic/down casting correctly
290  */
291  fib_node_type_t fn_type;
292 
293  /**
294  * Some pad space the concrete/derived type is free to use
295  */
297 
298  /**
299  * Vector of nodes that depend upon/use/share this node
300  */
301  fib_node_list_t fn_children;
302 
303  /**
304  * Number of dependents on this node. This number includes the number
305  * of children
306  */
308 } fib_node_t;
309 
310 STATIC_ASSERT(sizeof(fib_node_t) == 12, "FIB node type is growing");
311 
312 /**
313  * @brief
314  * Register the function table for a given type
315  *
316  * @param ft
317  * FIB node type
318  *
319  * @param vft
320  * virtual function table
321  */
322 extern void fib_node_register_type (fib_node_type_t ft,
323  const fib_node_vft_t *vft);
324 
325 /**
326  * @brief
327  * Create a new FIB node type and Register the function table for it.
328  *
329  * @param vft
330  * virtual function table
331  *
332  * @return new FIB node type
333  */
334 extern fib_node_type_t fib_node_register_new_type (const fib_node_vft_t *vft);
335 
336 /**
337  * @brief Show the memory usage for a type
338  *
339  * This should be invoked by the type in response to the infra calling
340  * its registered memory show function
341  *
342  * @param name the name of the type
343  * @param in_use_elts The number of elements in use
344  * @param allocd_elts The number of allocated pool elemenets
345  * @param size_elt The size of one element
346  */
347 extern void fib_show_memory_usage(const char *name,
348  u32 in_use_elts,
349  u32 allocd_elts,
350  size_t size_elt);
351 
352 extern void fib_node_init(fib_node_t *node,
353  fib_node_type_t ft);
354 extern void fib_node_deinit(fib_node_t *node);
355 
356 extern void fib_node_lock(fib_node_t *node);
357 extern void fib_node_unlock(fib_node_t *node);
358 
359 extern u32 fib_node_get_n_children(fib_node_type_t parent_type,
360  fib_node_index_t parent_index);
361 extern u32 fib_node_child_add(fib_node_type_t parent_type,
362  fib_node_index_t parent_index,
363  fib_node_type_t child_type,
364  fib_node_index_t child_index);
365 extern void fib_node_child_remove(fib_node_type_t parent_type,
366  fib_node_index_t parent_index,
367  fib_node_index_t sibling_index);
368 
369 extern fib_node_back_walk_rc_t fib_node_back_walk_one(fib_node_ptr_t *ptr,
371 
372 extern u8* fib_node_children_format(fib_node_list_t list,
373  u8 *s);
374 
375 extern const char* fib_node_type_get_name(fib_node_type_t type);
376 
377 static inline int
379 {
380  return (FIB_NODE_INDEX_INVALID != ni);
381 }
382 
383 #endif
384 
enum fib_node_back_walk_rc_t_ fib_node_back_walk_rc_t
Return code from a back walk function.
Walk to update children to inform them the adjacency is now down.
Definition: fib_node.h:118
const char * fib_node_type_get_name(fib_node_type_t type)
Definition: fib_node.c:37
u8 *( format_function_t)(u8 *s, va_list *args)
Definition: format.h:48
void fib_node_lock(fib_node_t *node)
Definition: fib_node.c:203
Walk to re-collapse the multipath adjs when the rewrite of a unipath adjacency changes.
Definition: fib_node.h:114
fib_node_back_walk_reason_t_
Reasons for backwalking the FIB object graph.
Definition: fib_node.h:82
unsigned char u8
Definition: types.h:56
Walk to re-resolve the child.
Definition: fib_node.h:91
fib_node_index_t fnp_index
node&#39;s index
Definition: fib_node.h:189
fib_node_bw_reason_flag_t_
Flags enum constructed from the reaons.
Definition: fib_node.h:143
fib_node_last_lock_gone_t fnv_last_lock
Definition: fib_node.h:276
fib_node_back_walk_rc_t(* fib_node_back_walk_t)(struct fib_node_t_ *node, fib_node_back_walk_ctx_t *ctx)
Function definition to backwalk a FIB node.
Definition: fib_node.h:251
fib_node_ptr_t fib_node_ptr_list_t
A list of dependent nodes.
Definition: fib_node.h:238
unsigned int u32
Definition: types.h:88
A representation of one pointer to another node.
Definition: fib_node.h:181
A resolving interface has gone down.
Definition: fib_node.h:105
u32 fib_node_get_n_children(fib_node_type_t parent_type, fib_node_index_t parent_index)
Definition: fib_node.c:142
struct fib_node_back_walk_ctx_t_ fib_node_back_walk_ctx_t
Context passed between object during a back walk.
void(* fib_node_last_lock_gone_t)(struct fib_node_t_ *node)
Function definition to inform the FIB node that its last lock has gone.
Definition: fib_node.h:263
fib_node_bw_reason_flag_t fnbw_reason
The reason/trigger for the backwalk.
Definition: fib_node.h:204
struct fib_node_t_ *(* fib_node_get_t)(fib_node_index_t index)
Function definition to get a FIB node from its index.
Definition: fib_node.h:258
struct fib_node_ptr_t_ fib_node_ptr_t
A representation of one pointer to another node.
fib_node_type_t fnp_type
node type
Definition: fib_node.h:185
u32 fnbw_depth
the number of levels the walk has already traversed.
Definition: fib_node.h:217
int(* fib_node_ptr_walk_t)(fib_node_ptr_t *depend, void *ctx)
A callback function for walking a node dependency list.
Definition: fib_node.h:231
unsigned short u16
Definition: types.h:57
fib_node_type_t fib_node_register_new_type(const fib_node_vft_t *vft)
Create a new FIB node type and Register the function table for it.
Definition: fib_node.c:80
fib_node_bw_flags_t fnbw_flags
additional flags for the walk
Definition: fib_node.h:209
void fib_node_register_type(fib_node_type_t ft, const fib_node_vft_t *vft)
Register the function table for a given type.
Definition: fib_node.c:60
STATIC_ASSERT(sizeof(fib_node_bw_reason_flag_t)< 2,"BW Reason enum < 2 byte. Consequences for cover_upd_res_t")
fib_node_type_t fn_type
The node&#39;s type.
Definition: fib_node.h:291
An node in the FIB graph.
Definition: fib_node.h:287
format_function_t * fnv_format
Definition: fib_node.h:278
enum fib_node_bw_reason_flag_t_ fib_node_bw_reason_flag_t
Flags enum constructed from the reaons.
fib_node_back_walk_rc_t fib_node_back_walk_one(fib_node_ptr_t *ptr, fib_node_back_walk_ctx_t *ctx)
Definition: fib_node.c:154
enum fib_node_bw_flags_t_ fib_node_bw_flags_t
Flags on the walk.
fib_node_list_t fn_children
Vector of nodes that depend upon/use/share this node.
Definition: fib_node.h:301
void fib_show_memory_usage(const char *name, u32 in_use_elts, u32 allocd_elts, size_t size_elt)
Show the memory usage for a type.
Definition: fib_node.c:220
Force the walk to be synchronous.
Definition: fib_node.h:166
fib_node_get_t fnv_get
Definition: fib_node.h:275
fib_node_back_walk_t fnv_back_walk
Definition: fib_node.h:277
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:30
A resolving interface has been deleted.
Definition: fib_node.h:109
Context passed between object during a back walk.
Definition: fib_node.h:200
long ctx[MAX_CONNS]
Definition: main.c:126
u8 * fib_node_children_format(fib_node_list_t list, u8 *s)
Definition: fib_node.c:176
fib_node_type_t_
The types of nodes in a FIB graph.
Definition: fib_node.h:24
void fib_node_init(fib_node_t *node, fib_node_type_t ft)
Definition: fib_node.c:185
enum fib_node_back_walk_reason_t_ fib_node_back_walk_reason_t
Reasons for backwalking the FIB object graph.
u32 fib_node_child_add(fib_node_type_t parent_type, fib_node_index_t parent_index, fib_node_type_t child_type, fib_node_index_t child_index)
Definition: fib_node.c:98
u16 fn_pad
Some pad space the concrete/derived type is free to use.
Definition: fib_node.h:296
void(* fib_node_memory_show_t)(void)
Function definition to display the amount of memory used by a type.
Definition: fib_node.h:269
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
u32 fn_locks
Number of dependents on this node.
Definition: fib_node.h:307
Walk to re-evaluate the forwarding contributed by the parent.
Definition: fib_node.h:97
A resolving interface has come up.
Definition: fib_node.h:101
struct fib_node_vft_t_ fib_node_vft_t
A FIB graph nodes virtual function table.
fib_node_bw_flags_t_
Flags on the walk.
Definition: fib_node.h:160
See the respective fib_*.h files for descriptions of these objects.
Definition: fib_node.h:32
static int fib_node_index_is_valid(fib_node_index_t ni)
Definition: fib_node.h:378
A FIB graph nodes virtual function table.
Definition: fib_node.h:274
u32 fib_node_list_t
A list of FIB nodes.
Definition: fib_node.h:195
fib_node_back_walk_rc_t_
Return code from a back walk function.
Definition: fib_node.h:243
void fib_node_unlock(fib_node_t *node)
Definition: fib_node.c:209
void fib_node_child_remove(fib_node_type_t parent_type, fib_node_index_t parent_index, fib_node_index_t sibling_index)
Definition: fib_node.c:123
struct fib_node_t_ fib_node_t
An node in the FIB graph.
void fib_node_deinit(fib_node_t *node)
Definition: fib_node.c:197
fib_node_memory_show_t fnv_mem_show
Definition: fib_node.h:279