FD.io VPP  v21.01
Vector Packet Processing
init.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 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  * init.h: mechanism for functions to be called at init/exit.
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #ifndef included_vlib_init_h
41 #define included_vlib_init_h
42 
43 #include <vppinfra/error.h>
44 #include <vppinfra/format.h>
45 #include <vppinfra/hash.h>
46 
47 /* Init/exit functions: called at start/end of main routine. Init
48  functions are typically used to register and setup packet
49  processing nodes. */
50 
51 typedef clib_error_t *(vlib_init_function_t) (struct vlib_main_t * vm);
52 
53 typedef struct _vlib_init_function_list_elt
54 {
55  struct _vlib_init_function_list_elt *next_init_function;
56  vlib_init_function_t *f;
57  char *name;
58  char **runs_before;
59  char **runs_after;
60  char **init_order;
61 } _vlib_init_function_list_elt_t;
62 
63 /* Configuration functions: called with configuration input just before
64  main polling loop starts. */
65 typedef clib_error_t *(vlib_config_function_t) (struct vlib_main_t * vm,
66  unformat_input_t * input);
67 
68 typedef struct vlib_config_function_runtime_t
69 {
70  /* Function to call. Set to null once function has already been called. */
71  vlib_config_function_t *function;
72 
73  /* Input for function. */
74  unformat_input_t input;
75 
76  /* next config function registration */
77  struct vlib_config_function_runtime_t *next_registration;
78 
79  /* To be invoked as soon as the clib heap is available */
80  u8 is_early;
81 
82  /* Name used to distinguish input on command line. */
83  char name[32];
84 } vlib_config_function_runtime_t;
85 
86 #define VLIB_REMOVE_FROM_LINKED_LIST(first,p,next) \
87 { \
88  ASSERT (first); \
89  if (first == p) \
90  first = (p)->next; \
91  else \
92  { \
93  __typeof__ (p) current = first; \
94  while (current->next) \
95  { \
96  if (current->next == p) \
97  { \
98  current->next = current->next->next; \
99  break; \
100  } \
101  current = current->next; \
102  } \
103  ASSERT (current); \
104  } \
105 }
106 
107 #define _VLIB_INIT_FUNCTION_SYMBOL(x, type) \
108  _vlib_##type##_function_##x
109 
110 #define VLIB_INIT_FUNCTION_SYMBOL(x) \
111  _VLIB_INIT_FUNCTION_SYMBOL(x, init)
112 #define VLIB_MAIN_LOOP_ENTER_FUNCTION_SYMBOL(x) \
113  _VLIB_INIT_FUNCTION_SYMBOL(x, main_loop_enter)
114 #define VLIB_MAIN_LOOP_EXIT_FUNCTION_SYMBOL(x) \
115  _VLIB_INIT_FUNCTION_SYMBOL(x, main_loop_exit)
116 #define VLIB_CONFIG_FUNCTION_SYMBOL(x) \
117  _VLIB_INIT_FUNCTION_SYMBOL(x, config)
118 
119 /* Declaration is global (e.g. not static) so that init functions can
120  be called from other modules to resolve init function depend. */
121 
122 #ifndef CLIB_MARCH_VARIANT
123 #define VLIB_DECLARE_INIT_FUNCTION(x, tag) \
124 vlib_init_function_t * _VLIB_INIT_FUNCTION_SYMBOL (x, tag) = x; \
125 static void __vlib_add_##tag##_function_##x (void) \
126  __attribute__((__constructor__)) ; \
127 static _vlib_init_function_list_elt_t _vlib_init_function_##tag##_##x; \
128 static void __vlib_add_##tag##_function_##x (void) \
129 { \
130  vlib_main_t * vm = vlib_get_main(); \
131  _vlib_init_function_##tag##_##x.next_init_function \
132  = vm->tag##_function_registrations; \
133  vm->tag##_function_registrations = &_vlib_init_function_##tag##_##x; \
134  _vlib_init_function_##tag##_##x.f = &x; \
135  _vlib_init_function_##tag##_##x.name = #x; \
136 } \
137 static void __vlib_rm_##tag##_function_##x (void) \
138  __attribute__((__destructor__)) ; \
139 static void __vlib_rm_##tag##_function_##x (void) \
140 { \
141  vlib_main_t * vm = vlib_get_main(); \
142  _vlib_init_function_list_elt_t *this, *prev; \
143  this = vm->tag##_function_registrations; \
144  if (this == 0) \
145  return; \
146  if (this->f == &x) \
147  { \
148  vm->tag##_function_registrations = this->next_init_function; \
149  return; \
150  } \
151  prev = this; \
152  this = this->next_init_function; \
153  while (this) \
154  { \
155  if (this->f == &x) \
156  { \
157  prev->next_init_function = \
158  this->next_init_function; \
159  return; \
160  } \
161  prev = this; \
162  this = this->next_init_function; \
163  } \
164 } \
165 static _vlib_init_function_list_elt_t _vlib_init_function_##tag##_##x
166 #else
167 /* create unused pointer to silence compiler warnings and get whole
168  function optimized out */
169 #define VLIB_DECLARE_INIT_FUNCTION(x, tag) \
170 static __clib_unused void * __clib_unused_##tag##_##x = x
171 #endif
172 
173 #define VLIB_INIT_FUNCTION(x) VLIB_DECLARE_INIT_FUNCTION(x,init)
174 #define VLIB_WORKER_INIT_FUNCTION(x) VLIB_DECLARE_INIT_FUNCTION(x,worker_init)
175 
176 #define VLIB_MAIN_LOOP_ENTER_FUNCTION(x) \
177  VLIB_DECLARE_INIT_FUNCTION(x,main_loop_enter)
178 #define VLIB_MAIN_LOOP_EXIT_FUNCTION(x) \
179 VLIB_DECLARE_INIT_FUNCTION(x,main_loop_exit)
180 
181 #ifndef CLIB_MARCH_VARIANT
182 #define VLIB_CONFIG_FUNCTION(x,n,...) \
183  __VA_ARGS__ vlib_config_function_runtime_t \
184  VLIB_CONFIG_FUNCTION_SYMBOL(x); \
185 static void __vlib_add_config_function_##x (void) \
186  __attribute__((__constructor__)) ; \
187 static void __vlib_add_config_function_##x (void) \
188 { \
189  vlib_main_t * vm = vlib_get_main(); \
190  VLIB_CONFIG_FUNCTION_SYMBOL(x).next_registration \
191  = vm->config_function_registrations; \
192  vm->config_function_registrations \
193  = &VLIB_CONFIG_FUNCTION_SYMBOL(x); \
194 } \
195 static void __vlib_rm_config_function_##x (void) \
196  __attribute__((__destructor__)) ; \
197 static void __vlib_rm_config_function_##x (void) \
198 { \
199  vlib_main_t * vm = vlib_get_main(); \
200  vlib_config_function_runtime_t *p = \
201  & VLIB_CONFIG_FUNCTION_SYMBOL (x); \
202  VLIB_REMOVE_FROM_LINKED_LIST \
203  (vm->config_function_registrations, p, next_registration);\
204 } \
205  vlib_config_function_runtime_t \
206  VLIB_CONFIG_FUNCTION_SYMBOL (x) \
207  = { \
208  .name = n, \
209  .function = x, \
210  .is_early = 0, \
211  }
212 #else
213 /* create unused pointer to silence compiler warnings and get whole
214  function optimized out */
215 #define VLIB_CONFIG_FUNCTION(x,n,...) \
216  static __clib_unused vlib_config_function_runtime_t \
217  VLIB_CONFIG_FUNCTION_SYMBOL (__clib_unused_##x) \
218  = { \
219  .name = n, \
220  .function = x, \
221  .is_early = 0, \
222  }
223 #endif
224 
225 #ifndef CLIB_MARCH_VARIANT
226 #define VLIB_EARLY_CONFIG_FUNCTION(x,n,...) \
227  __VA_ARGS__ vlib_config_function_runtime_t \
228  VLIB_CONFIG_FUNCTION_SYMBOL(x); \
229 static void __vlib_add_config_function_##x (void) \
230  __attribute__((__constructor__)) ; \
231 static void __vlib_add_config_function_##x (void) \
232 { \
233  vlib_main_t * vm = vlib_get_main(); \
234  VLIB_CONFIG_FUNCTION_SYMBOL(x).next_registration \
235  = vm->config_function_registrations; \
236  vm->config_function_registrations \
237  = &VLIB_CONFIG_FUNCTION_SYMBOL(x); \
238 } \
239 static void __vlib_rm_config_function_##x (void) \
240  __attribute__((__destructor__)) ; \
241 static void __vlib_rm_config_function_##x (void) \
242 { \
243  vlib_main_t * vm = vlib_get_main(); \
244  vlib_config_function_runtime_t *p = \
245  & VLIB_CONFIG_FUNCTION_SYMBOL (x); \
246  VLIB_REMOVE_FROM_LINKED_LIST \
247  (vm->config_function_registrations, p, next_registration);\
248 } \
249  vlib_config_function_runtime_t \
250  VLIB_CONFIG_FUNCTION_SYMBOL (x) \
251  = { \
252  .name = n, \
253  .function = x, \
254  .is_early = 1, \
255  }
256 #else
257 /* create unused pointer to silence compiler warnings and get whole
258  function optimized out */
259 #define VLIB_EARLY_CONFIG_FUNCTION(x,n,...) \
260  static __clib_unused vlib_config_function_runtime_t \
261  VLIB_CONFIG_FUNCTION_SYMBOL (__clib_unused_##x) \
262  = { \
263  .name = n, \
264  .function = x, \
265  .is_early = 1, \
266  }
267 #endif
268 
269 /* Call given init function: used for init function dependencies. */
270 #define vlib_call_init_function(vm, x) \
271  ({ \
272  extern vlib_init_function_t * VLIB_INIT_FUNCTION_SYMBOL (x); \
273  vlib_init_function_t * _f = VLIB_INIT_FUNCTION_SYMBOL (x); \
274  clib_error_t * _error = 0; \
275  if (! hash_get (vm->init_functions_called, _f)) \
276  { \
277  hash_set1 (vm->init_functions_called, _f); \
278  _error = _f (vm); \
279  } \
280  _error; \
281  })
282 
283 /* Don't call given init function: used to suppress parts of the netstack */
284 #define vlib_mark_init_function_complete(vm, x) \
285  ({ \
286  extern vlib_init_function_t * VLIB_INIT_FUNCTION_SYMBOL (x); \
287  vlib_init_function_t * _f = VLIB_INIT_FUNCTION_SYMBOL (x); \
288  hash_set1 (vm->init_functions_called, _f); \
289  })
290 
291 #define vlib_call_post_graph_init_function(vm, x) \
292  ({ \
293  extern vlib_init_function_t * VLIB_POST_GRAPH_INIT_FUNCTION_SYMBOL (x); \
294  vlib_init_function_t * _f = VLIB_POST_GRAPH_INIT_FUNCTION_SYMBOL (x); \
295  clib_error_t * _error = 0; \
296  if (! hash_get (vm->init_functions_called, _f)) \
297  { \
298  hash_set1 (vm->init_functions_called, _f); \
299  _error = _f (vm); \
300  } \
301  _error; \
302  })
303 
304 #define vlib_call_config_function(vm, x) \
305  ({ \
306  vlib_config_function_runtime_t * _r; \
307  clib_error_t * _error = 0; \
308  extern vlib_config_function_runtime_t \
309  VLIB_CONFIG_FUNCTION_SYMBOL (x); \
310  \
311  _r = &VLIB_CONFIG_FUNCTION_SYMBOL (x); \
312  if (! hash_get (vm->init_functions_called, _r->function)) \
313  { \
314  hash_set1 (vm->init_functions_called, _r->function); \
315  _error = _r->function (vm, &_r->input); \
316  } \
317  _error; \
318  })
319 
320 #define vlib_call_main_loop_enter_function(vm, x) \
321  ({ \
322  extern vlib_init_function_t * VLIB_MAIN_LOOP_ENTER_FUNCTION_SYMBOL (x); \
323  vlib_init_function_t * _f = VLIB_MAIN_LOOP_ENTER_FUNCTION_SYMBOL (x); \
324  clib_error_t * _error = 0; \
325  if (! hash_get (vm->init_functions_called, _f)) \
326  { \
327  hash_set1 (vm->init_functions_called, _f); \
328  _error = _f (vm); \
329  } \
330  _error; \
331  })
332 
333 /* External functions. */
334 clib_error_t *vlib_call_all_init_functions (struct vlib_main_t *vm);
335 clib_error_t *vlib_call_all_config_functions (struct vlib_main_t *vm,
336  unformat_input_t * input,
337  int is_early);
338 clib_error_t *vlib_call_all_main_loop_enter_functions (struct vlib_main_t
339  *vm);
340 clib_error_t *vlib_call_all_main_loop_exit_functions (struct vlib_main_t *vm);
341 clib_error_t *vlib_call_init_exit_functions (struct vlib_main_t *vm,
342  _vlib_init_function_list_elt_t **
343  headp, int call_once);
344 clib_error_t *vlib_call_init_exit_functions_no_sort (struct vlib_main_t *vm,
345  _vlib_init_function_list_elt_t
346  ** headp, int call_once);
347 clib_error_t *vlib_sort_init_exit_functions (_vlib_init_function_list_elt_t
348  **);
349 #define foreach_vlib_module_reference \
350  _ (node_cli) \
351  _ (trace_cli)
352 
353 /* Dummy function to get node_cli.c linked in. */
354 #define _(x) void vlib_##x##_reference (void);
355 foreach_vlib_module_reference
356 #undef _
357 #define VLIB_INITS(...) (char*[]) { __VA_ARGS__, 0}
358 #endif /* included_vlib_init_h */
359 /*
360  * fd.io coding-style-patch-verification: ON
361  *
362  * Local Variables:
363  * eval: (c-set-style "gnu")
364  * End:
365  */
vlib_call_all_main_loop_exit_functions
clib_error_t * vlib_call_all_main_loop_exit_functions(struct vlib_main_t *vm)
Definition: init.c:398
vlib_config_function_runtime_t::is_early
u8 is_early
Definition: init.h:80
foreach_vlib_module_reference
#define foreach_vlib_module_reference
Definition: init.h:349
vm
vlib_main_t * vm
Definition: in2out_ed.c:1578
u8
unsigned char u8
Definition: types.h:56
vlib_call_all_init_functions
clib_error_t * vlib_call_all_init_functions(struct vlib_main_t *vm)
Definition: init.c:378
vlib_config_function_runtime_t::input
unformat_input_t input
Definition: init.h:74
vlib_config_function_runtime_t
Definition: init.h:68
unformat_input_t
struct _unformat_input_t unformat_input_t
name
string name[64]
Definition: ip.api:44
vlib_init_function_t
clib_error_t *() vlib_init_function_t(struct vlib_main_t *vm)
Definition: init.h:51
vlib_config_function_runtime_t
struct vlib_config_function_runtime_t vlib_config_function_runtime_t
vlib_call_all_config_functions
clib_error_t * vlib_call_all_config_functions(struct vlib_main_t *vm, unformat_input_t *input, int is_early)
Definition: init.c:405
clib_error_t
Definition: clib_error.h:21
vlib_call_all_main_loop_enter_functions
clib_error_t * vlib_call_all_main_loop_enter_functions(struct vlib_main_t *vm)
Definition: init.c:391
vlib_sort_init_exit_functions
clib_error_t * vlib_sort_init_exit_functions(_vlib_init_function_list_elt_t **)
Topological sorter for init function chains.
Definition: init.c:76
vlib_main_t
Definition: main.h:119
vlib_config_function_t
clib_error_t *() vlib_config_function_t(struct vlib_main_t *vm, unformat_input_t *input)
Definition: init.h:65
vlib_config_function_runtime_t::next_registration
struct vlib_config_function_runtime_t * next_registration
Definition: init.h:77
vlib_call_init_exit_functions
clib_error_t * vlib_call_init_exit_functions(struct vlib_main_t *vm, _vlib_init_function_list_elt_t **headp, int call_once)
Definition: init.c:360
vlib_call_init_exit_functions_no_sort
clib_error_t * vlib_call_init_exit_functions_no_sort(struct vlib_main_t *vm, _vlib_init_function_list_elt_t **headp, int call_once)
Definition: init.c:369