FD.io VPP  v18.07.1-19-g511ce25
Vector Packet Processing
dpo.h
Go to the documentation of this file.
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  * @brief
17  * A Data-Path Object is an object that represents actions that are
18  * applied to packets are they are switched through VPP's data-path.
19  *
20  * The DPO can be considered to be like is a base class that is specialised
21  * by other objects to provide concreate actions
22  *
23  * The VLIB graph nodes are graph of DPO types, the DPO graph is a graph of
24  * instances.
25  */
26 
27 #ifndef __DPO_H__
28 #define __DPO_H__
29 
30 #include <vnet/vnet.h>
31 
32 /**
33  * @brief An index for adjacencies.
34  * Alas 'C' is not typesafe enough to b0rk when a u32 is used instead of
35  * an index_t. However, for us humans, we can glean much more intent
36  * from the declaration
37  * foo barindex_t t);
38  * than we can from
39  * foo bar(u32 t);
40  */
41 typedef u32 index_t;
42 
43 /**
44  * @brief Invalid index - used when no index is known
45  * blazoned capitals INVALID speak volumes where ~0 does not.
46  */
47 #define INDEX_INVALID ((index_t)(~0))
48 
49 /**
50  * @brief Data path protocol.
51  * Actions performed on packets in the data-plane can be described and represented
52  * by protocol independent objects, i.e. ADJACENCY, but the spceifics actions
53  * required during ADJACENCY processing can be protocol dependent. For example,
54  * the adjacency rewrite node performs a ip4 checksum calculation, ip6 and MPLS
55  * do not, all 3 perform a TTL decrement. The VLIB graph nodes are thus protocol
56  * dependent, and thus each graph edge/arc is too.
57  * When programming a DPO's next node arc from child to parent it is thus required
58  * to know the parent's data-path protocol so the correct arc index can be used.
59  */
60 typedef enum dpo_proto_t_
61 {
68 } __attribute__((packed)) dpo_proto_t;
69 
70 #define DPO_PROTO_NUM ((dpo_proto_t)(DPO_PROTO_NSH+1))
71 #define DPO_PROTO_NONE ((dpo_proto_t)(DPO_PROTO_NUM+1))
72 
73 #define DPO_PROTOS { \
74  [DPO_PROTO_IP4] = "ip4", \
75  [DPO_PROTO_IP6] = "ip6", \
76  [DPO_PROTO_ETHERNET] = "ethernet", \
77  [DPO_PROTO_MPLS] = "mpls", \
78  [DPO_PROTO_NSH] = "nsh", \
79  [DPO_PROTO_BIER] = "bier", \
80 }
81 
82 #define FOR_EACH_DPO_PROTO(_proto) \
83  for (_proto = DPO_PROTO_IP4; \
84  _proto <= DPO_PROTO_NSH; \
85  _proto++)
86 
87 /**
88  * @brief Common types of data-path objects
89  * New types can be dynamically added using dpo_register_new_type()
90  */
91 typedef enum dpo_type_t_ {
92  /**
93  * A non-zero value first so we can spot unitialisation errors
94  */
99  /**
100  * @brief load-balancing over a choice of [un]equal cost paths
101  */
128 } __attribute__((packed)) dpo_type_t;
129 
130 #define DPO_TYPE_NUM DPO_LAST
131 
132 #define DPO_TYPES { \
133  [DPO_FIRST] = "dpo-invalid", \
134  [DPO_DROP] = "dpo-drop", \
135  [DPO_IP_NULL] = "dpo-ip-null", \
136  [DPO_PUNT] = "dpo-punt", \
137  [DPO_ADJACENCY] = "dpo-adjacency", \
138  [DPO_ADJACENCY_INCOMPLETE] = "dpo-adjacency-incomplete", \
139  [DPO_ADJACENCY_MIDCHAIN] = "dpo-adjacency-midcahin", \
140  [DPO_ADJACENCY_GLEAN] = "dpo-glean", \
141  [DPO_ADJACENCY_MCAST] = "dpo-adj-mcast", \
142  [DPO_ADJACENCY_MCAST_MIDCHAIN] = "dpo-adj-mcast-midchain", \
143  [DPO_RECEIVE] = "dpo-receive", \
144  [DPO_LOOKUP] = "dpo-lookup", \
145  [DPO_LOAD_BALANCE] = "dpo-load-balance", \
146  [DPO_REPLICATE] = "dpo-replicate", \
147  [DPO_LISP_CP] = "dpo-lisp-cp", \
148  [DPO_CLASSIFY] = "dpo-classify", \
149  [DPO_MPLS_DISPOSITION_PIPE] = "dpo-mpls-diposition-pipe", \
150  [DPO_MPLS_DISPOSITION_UNIFORM] = "dpo-mpls-diposition-uniform", \
151  [DPO_MFIB_ENTRY] = "dpo-mfib-entry", \
152  [DPO_INTERFACE_RX] = "dpo-interface-rx", \
153  [DPO_INTERFACE_TX] = "dpo-interface-tx", \
154  [DPO_DVR] = "dpo-dvr", \
155  [DPO_L3_PROXY] = "dpo-l3-proxy", \
156  [DPO_BIER_TABLE] = "bier-table", \
157  [DPO_BIER_FMASK] = "bier-fmask", \
158  [DPO_BIER_IMP] = "bier-imposition", \
159  [DPO_BIER_DISP_ENTRY] = "bier-disp-entry", \
160  [DPO_BIER_DISP_TABLE] = "bier-disp-table", \
161  [DPO_IP6_LL] = "ip6-link-local", \
162 }
163 
164 /**
165  * @brief The identity of a DPO is a combination of its type and its
166  * instance number/index of objects of that type
167  */
168 typedef struct dpo_id_t_ {
169  /**
170  * the type
171  */
172  dpo_type_t dpoi_type;
173  /**
174  * the data-path protocol of the type.
175  */
176  dpo_proto_t dpoi_proto;
177  /**
178  * The next VLIB node to follow.
179  */
181  /**
182  * the index of objects of that type
183  */
184  index_t dpoi_index;
185 } __attribute__ ((aligned(sizeof(u64)))) dpo_id_t;
186 
187 STATIC_ASSERT(sizeof(dpo_id_t) <= sizeof(u64),
188  "DPO ID is greater than sizeof u64 "
189  "atomic updates need to be revisited");
190 
191 /**
192  * @brief An initialiser for DPOs declared on the stack.
193  * Thenext node is set to 0 since VLIB graph nodes should set 0 index to drop.
194  */
195 #define DPO_INVALID \
196 { \
197  .dpoi_type = DPO_FIRST, \
198  .dpoi_proto = DPO_PROTO_NONE, \
199  .dpoi_index = INDEX_INVALID, \
200  .dpoi_next_node = 0, \
201 }
202 
203 /**
204  * @brief Return true if the DPO object is valid, i.e. has been initialised.
205  */
206 static inline int
207 dpo_id_is_valid (const dpo_id_t *dpoi)
208 {
209  return (dpoi->dpoi_type != DPO_FIRST &&
210  dpoi->dpoi_index != INDEX_INVALID);
211 }
212 
213 extern dpo_proto_t vnet_link_to_dpo_proto(vnet_link_t linkt);
214 
215 /**
216  * @brief
217  * Take a reference counting lock on the DPO
218  */
219 extern void dpo_lock(dpo_id_t *dpo);
220 
221 /**
222  * @brief
223  * Release a reference counting lock on the DPO
224  */
225 extern void dpo_unlock(dpo_id_t *dpo);
226 
227 /**
228  * @brief
229  * Make an interpose DPO from an original
230  */
231 extern void dpo_mk_interpose(const dpo_id_t *original,
232  const dpo_id_t *parent,
233  dpo_id_t *clone);
234 
235 /**
236  * @brief Set/create a DPO ID
237  * The DPO will be locked.
238  *
239  * @param dpo
240  * The DPO object to configure
241  *
242  * @param type
243  * The dpo_type_t of the DPO
244  *
245  * @param proto
246  * The dpo_proto_t of the DPO
247  *
248  * @param index
249  * The type specific index of the DPO
250  */
251 extern void dpo_set(dpo_id_t *dpo,
252  dpo_type_t type,
253  dpo_proto_t proto,
254  index_t index);
255 
256 /**
257  * @brief reset a DPO ID
258  * The DPO will be unlocked.
259  *
260  * @param dpo
261  * The DPO object to reset
262  */
263 extern void dpo_reset(dpo_id_t *dpo);
264 
265 /**
266  * @brief compare two DPOs for equality
267  */
268 extern int dpo_cmp(const dpo_id_t *dpo1,
269  const dpo_id_t *dpo2);
270 
271 /**
272  * @brief
273  * atomic copy a data-plane object.
274  * This is safe to use when the dst DPO is currently switching packets
275  */
276 extern void dpo_copy(dpo_id_t *dst,
277  const dpo_id_t *src);
278 
279 /**
280  * @brief Return TRUE is the DPO is any type of adjacency
281  */
282 extern int dpo_is_adj(const dpo_id_t *dpo);
283 
284 /**
285  * @biref Format a DPO_id_t oject
286  */
287 extern u8 *format_dpo_id(u8 * s, va_list * args);
288 
289 /**
290  * @biref format a DPO type
291  */
292 extern u8 *format_dpo_type(u8 * s, va_list * args);
293 
294 /**
295  * @brief format a DPO protocol
296  */
297 extern u8 *format_dpo_proto(u8 * s, va_list * args);
298 
299 /**
300  * @brief format a DPO protocol
301  */
302 extern vnet_link_t dpo_proto_to_link(dpo_proto_t dp);
303 
304 /**
305  * @brief
306  * Set and stack a DPO.
307  * The DPO passed is set to the parent DPO and the necessary
308  * VLIB graph arcs are created. The child_type and child_proto
309  * are used to get the VLID nodes from which the arcs are added.
310  *
311  * @param child_type
312  * Child DPO type.
313  *
314  * @param child_proto
315  * Child DPO proto
316  *
317  * @parem dpo
318  * This is the DPO to stack and set.
319  *
320  * @paren parent_dpo
321  * The parent DPO to stack onto.
322  */
323 extern void dpo_stack(dpo_type_t child_type,
324  dpo_proto_t child_proto,
325  dpo_id_t *dpo,
326  const dpo_id_t *parent_dpo);
327 
328 /**
329  * @brief
330  * Set and stack a DPO.
331  * The DPO passed is set to the parent DPO and the necessary
332  * VLIB graph arcs are created, from the child_node passed.
333  *
334  * @param child_node
335  * The VLIB grpah node index to create an arc from to the parent
336  *
337  * @param dpo
338  * This is the DPO to stack and set.
339  *
340  * @param parent_dpo
341  * The parent DPO to stack onto.
342  */
343 extern void dpo_stack_from_node(u32 child_node,
344  dpo_id_t *dpo,
345  const dpo_id_t *parent);
346 
347 /**
348  * Get a uRPF interface for the DPO
349  *
350  * @param dpo
351  * The DPO from which to get the uRPF interface
352  *
353  * @return valid SW interface index or ~0
354  */
355 extern u32 dpo_get_urpf(const dpo_id_t *dpo);
356 
357 /**
358  * @brief A lock function registered for a DPO type
359  */
360 typedef void (*dpo_lock_fn_t)(dpo_id_t *dpo);
361 
362 /**
363  * @brief An unlock function registered for a DPO type
364  */
365 typedef void (*dpo_unlock_fn_t)(dpo_id_t *dpo);
366 
367 /**
368  * @brief An memory usage show command
369  */
370 typedef void (*dpo_mem_show_t)(void);
371 
372 /**
373  * @brief Given a DPO instance return a vector of node indices that
374  * the type/instance will use.
375  */
376 typedef u32* (*dpo_get_next_node_t)(const dpo_id_t *dpo);
377 
378 /**
379  * @brief Given a DPO instance return an interface that can
380  * be used in an uRPF check
381  */
382 typedef u32 (*dpo_get_urpf_t)(const dpo_id_t *dpo);
383 
384 /**
385  * @brief Called during FIB interposition when the originally
386  * registered DPO is used to 'clone' an instance for interposition
387  * at a particular location in the FIB graph.
388  * The parent is the next DPO in the chain that the clone will
389  * be used instead of. The clone may then choose to stack itself
390  * on the parent.
391  */
392 typedef void (*dpo_mk_interpose_t)(const dpo_id_t *original,
393  const dpo_id_t *parent,
394  dpo_id_t *clone);
395 
396 /**
397  * @brief A virtual function table regisitered for a DPO type
398  */
399 typedef struct dpo_vft_t_
400 {
401  /**
402  * A reference counting lock function
403  */
405  /**
406  * A reference counting unlock function
407  */
409  /**
410  * A format function
411  */
413  /**
414  * A show memory usage function
415  */
417  /**
418  * A function to get the next VLIB node given an instance
419  * of the DPO. If this is null, then the node's name MUST be
420  * retreiveable from the nodes names array passed in the register
421  * function
422  */
424  /**
425  * Get uRPF interface
426  */
428  /**
429  * Signal on an interposed child that the parent has changed
430  */
432 } dpo_vft_t;
433 
434 
435 /**
436  * @brief For a given DPO type Register:
437  * - a virtual function table
438  * - a NULL terminated array of graph nodes from which that object type
439  * will originate packets, i.e. the nodes in which the object type will be
440  * the parent DPO in the DP graph. The ndoes are per-data-path protocol
441  * (see above).
442  *
443  * @param type
444  * The type being registered.
445  *
446  * @param vft
447  * The virtual function table to register for the type.
448  *
449  * @param nodes
450  * The string description of the per-protocol VLIB graph nodes.
451  */
452 extern void dpo_register(dpo_type_t type,
453  const dpo_vft_t *vft,
454  const char * const * const * nodes);
455 
456 /**
457  * @brief Create and register a new DPO type.
458  *
459  * This can be used by plugins to create new DPO types that are not listed
460  * in dpo_type_t enum
461  *
462  * @param vft
463  * The virtual function table to register for the type.
464  *
465  * @param nodes
466  * The string description of the per-protocol VLIB graph nodes.
467  *
468  * @return The new dpo_type_t
469  */
470 extern dpo_type_t dpo_register_new_type(const dpo_vft_t *vft,
471  const char * const * const * nodes);
472 
473 /**
474  * @brief Return already stacked up next node index for a given
475  * child_type/child_proto and parent_type/patent_proto.
476  * The VLIB graph arc used is taken from the parent and child types
477  * passed.
478  *
479  * @param child_type
480  * Child DPO type.
481  *
482  * @param child_proto
483  * Child DPO proto
484  *
485  * @param parent_type
486  * Parent DPO type.
487  *
488  * @param parent_proto
489  * Parent DPO proto
490  *
491  * @return The VLIB Graph node index
492  */
493 extern u32
494 dpo_get_next_node_by_type_and_proto (dpo_type_t child_type,
495  dpo_proto_t child_proto,
496  dpo_type_t parent_type,
497  dpo_proto_t parent_proto);
498 #endif
dpo_lock_fn_t dv_lock
A reference counting lock function.
Definition: dpo.h:404
Definition: dpo.h:98
void(* dpo_lock_fn_t)(dpo_id_t *dpo)
A lock function registered for a DPO type.
Definition: dpo.h:360
A virtual function table regisitered for a DPO type.
Definition: dpo.h:399
dpo_proto_t_
Data path protocol.
Definition: dpo.h:60
static int dpo_id_is_valid(const dpo_id_t *dpoi)
Return true if the DPO object is valid, i.e.
Definition: dpo.h:207
void dpo_mk_interpose(const dpo_id_t *original, const dpo_id_t *parent, dpo_id_t *clone)
Make an interpose DPO from an original.
Definition: dpo.c:352
dpo_get_urpf_t dv_get_urpf
Get uRPF interface.
Definition: dpo.h:427
dpo_proto_t dpoi_proto
the data-path protocol of the type.
Definition: dpo.h:176
u32 *(* dpo_get_next_node_t)(const dpo_id_t *dpo)
Given a DPO instance return a vector of node indices that the type/instance will use.
Definition: dpo.h:376
u32 index_t
A Data-Path Object is an object that represents actions that are applied to packets are they are swit...
Definition: dpo.h:41
dpo_type_t_
Common types of data-path objects New types can be dynamically added using dpo_register_new_type() ...
Definition: dpo.h:91
void(* dpo_mk_interpose_t)(const dpo_id_t *original, const dpo_id_t *parent, dpo_id_t *clone)
Called during FIB interposition when the originally registered DPO is used to &#39;clone&#39; an instance for...
Definition: dpo.h:392
u8 *( format_function_t)(u8 *s, va_list *args)
Definition: format.h:48
u32(* dpo_get_urpf_t)(const dpo_id_t *dpo)
Given a DPO instance return an interface that can be used in an uRPF check.
Definition: dpo.h:382
void dpo_unlock(dpo_id_t *dpo)
Release a reference counting lock on the DPO.
Definition: dpo.c:372
unsigned char u8
Definition: types.h:56
STATIC_ASSERT(sizeof(dpo_id_t)<=sizeof(u64),"DPO ID is greater than sizeof u64 ""atomic updates need to be revisited")
u8 * format_dpo_proto(u8 *s, va_list *args)
format a DPO protocol
Definition: dpo.c:177
u8 * format_dpo_id(u8 *s, va_list *args)
Format a DPO_id_t oject
Definition: dpo.c:147
unsigned int u32
Definition: types.h:88
dpo_get_next_node_t dv_get_next_node
A function to get the next VLIB node given an instance of the DPO.
Definition: dpo.h:423
u32 dpo_get_urpf(const dpo_id_t *dpo)
Get a uRPF interface for the DPO.
Definition: dpo.c:381
void dpo_set(dpo_id_t *dpo, dpo_type_t type, dpo_proto_t proto, index_t index)
Set/create a DPO ID The DPO will be locked.
Definition: dpo.c:185
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:168
void dpo_stack(dpo_type_t child_type, dpo_proto_t child_proto, dpo_id_t *dpo, const dpo_id_t *parent_dpo)
Set and stack a DPO.
Definition: dpo.c:515
void(* dpo_mem_show_t)(void)
An memory usage show command.
Definition: dpo.h:370
Definition: dpo.h:127
dpo_type_t dpoi_type
the type
Definition: dpo.h:172
unsigned short u16
Definition: types.h:57
vnet_link_t dpo_proto_to_link(dpo_proto_t dp)
format a DPO protocol
Definition: dpo.c:117
load-balancing over a choice of [un]equal cost paths
Definition: dpo.h:102
void dpo_reset(dpo_id_t *dpo)
reset a DPO ID The DPO will be unlocked.
Definition: dpo.c:231
int dpo_cmp(const dpo_id_t *dpo1, const dpo_id_t *dpo2)
compare two DPOs for equality
Definition: dpo.c:248
void dpo_register(dpo_type_t type, const dpo_vft_t *vft, const char *const *const *nodes)
For a given DPO type Register:
Definition: dpo.c:321
void dpo_copy(dpo_id_t *dst, const dpo_id_t *src)
atomic copy a data-plane object.
Definition: dpo.c:261
u8 * format_dpo_type(u8 *s, va_list *args)
format a DPO type
Definition: dpo.c:137
int dpo_is_adj(const dpo_id_t *dpo)
Return TRUE is the DPO is any type of adjacency.
Definition: dpo.c:277
enum vnet_link_t_ vnet_link_t
Link Type: A description of the protocol of packets on the link.
A non-zero value first so we can spot unitialisation errors.
Definition: dpo.h:95
void dpo_lock(dpo_id_t *dpo)
Take a reference counting lock on the DPO.
Definition: dpo.c:363
u32 dpo_get_next_node_by_type_and_proto(dpo_type_t child_type, dpo_proto_t child_proto, dpo_type_t parent_type, dpo_proto_t parent_proto)
Return already stacked up next node index for a given child_type/child_proto and parent_type/patent_p...
Definition: dpo.c:471
void(* dpo_unlock_fn_t)(dpo_id_t *dpo)
An unlock function registered for a DPO type.
Definition: dpo.h:365
dpo_mem_show_t dv_mem_show
A show memory usage function.
Definition: dpo.h:416
dpo_type_t dpo_register_new_type(const dpo_vft_t *vft, const char *const *const *nodes)
Create and register a new DPO type.
Definition: dpo.c:341
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:184
format_function_t * dv_format
A format function.
Definition: dpo.h:412
#define INDEX_INVALID
Invalid index - used when no index is known blazoned capitals INVALID speak volumes where ~0 does not...
Definition: dpo.h:47
dpo_lock_fn_t dv_unlock
A reference counting unlock function.
Definition: dpo.h:408
void dpo_stack_from_node(u32 child_node, dpo_id_t *dpo, const dpo_id_t *parent)
Set and stack a DPO.
Definition: dpo.c:530
Definition: dpo.h:119
dpo_proto_t vnet_link_to_dpo_proto(vnet_link_t linkt)
Definition: dpo.c:95
u16 dpoi_next_node
The next VLIB node to follow.
Definition: dpo.h:180
Definition: dpo.h:96
struct dpo_vft_t_ dpo_vft_t
A virtual function table regisitered for a DPO type.
dpo_mk_interpose_t dv_mk_interpose
Signal on an interposed child that the parent has changed.
Definition: dpo.h:431