FD.io VPP  v18.07-rc0-415-g6c78436
Vector Packet Processing
init.h
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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 
52 
53 typedef struct _vlib_init_function_list_elt
54 {
55  struct _vlib_init_function_list_elt *next_init_function;
57 } _vlib_init_function_list_elt_t;
58 
59 /* Configuration functions: called with configuration input just before
60  main polling loop starts. */
62  unformat_input_t * input);
63 
65 {
66  /* Function to call. Set to null once function has already been called. */
68 
69  /* Input for function. */
71 
72  /* next config function registration */
74 
75  /* To be invoked as soon as the clib heap is available */
77 
78  /* Name used to distinguish input on command line. */
79  char name[32];
81 
82 #define VLIB_REMOVE_FROM_LINKED_LIST(first,p,next) \
83 { \
84  ASSERT (first); \
85  if (first == p) \
86  first = (p)->next; \
87  else \
88  { \
89  __typeof__ (p) current = first; \
90  while (current->next) \
91  { \
92  if (current->next == p) \
93  { \
94  current->next = current->next->next; \
95  break; \
96  } \
97  current = current->next; \
98  } \
99  ASSERT (current); \
100  } \
101 }
102 
103 #define _VLIB_INIT_FUNCTION_SYMBOL(x, type) \
104  _vlib_##type##_function_##x
105 
106 #define VLIB_INIT_FUNCTION_SYMBOL(x) \
107  _VLIB_INIT_FUNCTION_SYMBOL(x, init)
108 #define VLIB_MAIN_LOOP_ENTER_FUNCTION_SYMBOL(x) \
109  _VLIB_INIT_FUNCTION_SYMBOL(x, main_loop_enter)
110 #define VLIB_MAIN_LOOP_EXIT_FUNCTION_SYMBOL(x) \
111  _VLIB_INIT_FUNCTION_SYMBOL(x, main_loop_exit)
112 #define VLIB_CONFIG_FUNCTION_SYMBOL(x) \
113  _VLIB_INIT_FUNCTION_SYMBOL(x, config)
114 
115 /* Declaration is global (e.g. not static) so that init functions can
116  be called from other modules to resolve init function depend. */
117 
118 #define VLIB_DECLARE_INIT_FUNCTION(x, tag) \
119 vlib_init_function_t * _VLIB_INIT_FUNCTION_SYMBOL (x, tag) = x; \
120 static void __vlib_add_##tag##_function_##x (void) \
121  __attribute__((__constructor__)) ; \
122 static void __vlib_add_##tag##_function_##x (void) \
123 { \
124  vlib_main_t * vm = vlib_get_main(); \
125  static _vlib_init_function_list_elt_t _vlib_init_function; \
126  _vlib_init_function.next_init_function \
127  = vm->tag##_function_registrations; \
128  vm->tag##_function_registrations = &_vlib_init_function; \
129  _vlib_init_function.f = &x; \
130 } \
131 static void __vlib_rm_##tag##_function_##x (void) \
132  __attribute__((__destructor__)) ; \
133 static void __vlib_rm_##tag##_function_##x (void) \
134 { \
135  vlib_main_t * vm = vlib_get_main(); \
136  _vlib_init_function_list_elt_t *next; \
137  if (vm->tag##_function_registrations->f == &x) \
138  { \
139  vm->tag##_function_registrations = \
140  vm->tag##_function_registrations->next_init_function; \
141  return; \
142  } \
143  next = vm->tag##_function_registrations; \
144  while (next->next_init_function) \
145  { \
146  if (next->next_init_function->f == &x) \
147  { \
148  next->next_init_function = \
149  next->next_init_function->next_init_function; \
150  return; \
151  } \
152  next = next->next_init_function; \
153  } \
154 }
155 
156 #define VLIB_INIT_FUNCTION(x) VLIB_DECLARE_INIT_FUNCTION(x,init)
157 #define VLIB_WORKER_INIT_FUNCTION(x) VLIB_DECLARE_INIT_FUNCTION(x,worker_init)
158 
159 #define VLIB_MAIN_LOOP_ENTER_FUNCTION(x) \
160  VLIB_DECLARE_INIT_FUNCTION(x,main_loop_enter)
161 #define VLIB_MAIN_LOOP_EXIT_FUNCTION(x) \
162 VLIB_DECLARE_INIT_FUNCTION(x,main_loop_exit)
163 
164 #define VLIB_CONFIG_FUNCTION(x,n,...) \
165  __VA_ARGS__ vlib_config_function_runtime_t \
166  VLIB_CONFIG_FUNCTION_SYMBOL(x); \
167 static void __vlib_add_config_function_##x (void) \
168  __attribute__((__constructor__)) ; \
169 static void __vlib_add_config_function_##x (void) \
170 { \
171  vlib_main_t * vm = vlib_get_main(); \
172  VLIB_CONFIG_FUNCTION_SYMBOL(x).next_registration \
173  = vm->config_function_registrations; \
174  vm->config_function_registrations \
175  = &VLIB_CONFIG_FUNCTION_SYMBOL(x); \
176 } \
177 static void __vlib_rm_config_function_##x (void) \
178  __attribute__((__destructor__)) ; \
179 static void __vlib_rm_config_function_##x (void) \
180 { \
181  vlib_main_t * vm = vlib_get_main(); \
182  vlib_config_function_runtime_t *p = \
183  & VLIB_CONFIG_FUNCTION_SYMBOL (x); \
184  VLIB_REMOVE_FROM_LINKED_LIST \
185  (vm->config_function_registrations, p, next_registration);\
186 } \
187  vlib_config_function_runtime_t \
188  VLIB_CONFIG_FUNCTION_SYMBOL (x) \
189  = { \
190  .name = n, \
191  .function = x, \
192  .is_early = 0, \
193  }
194 
195 #define VLIB_EARLY_CONFIG_FUNCTION(x,n,...) \
196  __VA_ARGS__ vlib_config_function_runtime_t \
197  VLIB_CONFIG_FUNCTION_SYMBOL(x); \
198 static void __vlib_add_config_function_##x (void) \
199  __attribute__((__constructor__)) ; \
200 static void __vlib_add_config_function_##x (void) \
201 { \
202  vlib_main_t * vm = vlib_get_main(); \
203  VLIB_CONFIG_FUNCTION_SYMBOL(x).next_registration \
204  = vm->config_function_registrations; \
205  vm->config_function_registrations \
206  = &VLIB_CONFIG_FUNCTION_SYMBOL(x); \
207 } \
208 static void __vlib_rm_config_function_##x (void) \
209  __attribute__((__destructor__)) ; \
210 static void __vlib_rm_config_function_##x (void) \
211 { \
212  vlib_main_t * vm = vlib_get_main(); \
213  vlib_config_function_runtime_t *p = \
214  & VLIB_CONFIG_FUNCTION_SYMBOL (x); \
215  VLIB_REMOVE_FROM_LINKED_LIST \
216  (vm->config_function_registrations, p, next_registration);\
217 } \
218  vlib_config_function_runtime_t \
219  VLIB_CONFIG_FUNCTION_SYMBOL (x) \
220  = { \
221  .name = n, \
222  .function = x, \
223  .is_early = 1, \
224  }
225 
226 /* Call given init function: used for init function dependencies. */
227 #define vlib_call_init_function(vm, x) \
228  ({ \
229  extern vlib_init_function_t * VLIB_INIT_FUNCTION_SYMBOL (x); \
230  vlib_init_function_t * _f = VLIB_INIT_FUNCTION_SYMBOL (x); \
231  clib_error_t * _error = 0; \
232  if (! hash_get (vm->init_functions_called, _f)) \
233  { \
234  hash_set1 (vm->init_functions_called, _f); \
235  _error = _f (vm); \
236  } \
237  _error; \
238  })
239 
240 /* Don't call given init function: used to suppress parts of the netstack */
241 #define vlib_mark_init_function_complete(vm, x) \
242  ({ \
243  extern vlib_init_function_t * VLIB_INIT_FUNCTION_SYMBOL (x); \
244  vlib_init_function_t * _f = VLIB_INIT_FUNCTION_SYMBOL (x); \
245  hash_set1 (vm->init_functions_called, _f); \
246  })
247 
248 #define vlib_call_post_graph_init_function(vm, x) \
249  ({ \
250  extern vlib_init_function_t * VLIB_POST_GRAPH_INIT_FUNCTION_SYMBOL (x); \
251  vlib_init_function_t * _f = VLIB_POST_GRAPH_INIT_FUNCTION_SYMBOL (x); \
252  clib_error_t * _error = 0; \
253  if (! hash_get (vm->init_functions_called, _f)) \
254  { \
255  hash_set1 (vm->init_functions_called, _f); \
256  _error = _f (vm); \
257  } \
258  _error; \
259  })
260 
261 #define vlib_call_config_function(vm, x) \
262  ({ \
263  vlib_config_function_runtime_t * _r; \
264  clib_error_t * _error = 0; \
265  extern vlib_config_function_runtime_t \
266  VLIB_CONFIG_FUNCTION_SYMBOL (x); \
267  \
268  _r = &VLIB_CONFIG_FUNCTION_SYMBOL (x); \
269  if (! hash_get (vm->init_functions_called, _r->function)) \
270  { \
271  hash_set1 (vm->init_functions_called, _r->function); \
272  _error = _r->function (vm, &_r->input); \
273  } \
274  _error; \
275  })
276 
277 /* External functions. */
281  int is_early);
283  *vm);
286  _vlib_init_function_list_elt_t *
287  head, int call_once);
288 
289 #define foreach_vlib_module_reference \
290  _ (node_cli) \
291  _ (trace_cli)
292 
293 /* Dummy function to get node_cli.c linked in. */
294 #define _(x) void vlib_##x##_reference (void);
296 #undef _
297 #endif /* included_vlib_init_h */
298 /*
299  * fd.io coding-style-patch-verification: ON
300  *
301  * Local Variables:
302  * eval: (c-set-style "gnu")
303  * End:
304  */
clib_error_t * vlib_call_all_main_loop_exit_functions(struct vlib_main_t *vm)
Definition: init.c:87
#define foreach_vlib_module_reference
Definition: init.h:289
unsigned char u8
Definition: types.h:56
clib_error_t * vlib_call_all_init_functions(struct vlib_main_t *vm)
Definition: init.c:67
unformat_input_t input
Definition: init.h:70
clib_error_t *( vlib_config_function_t)(struct vlib_main_t *vm, unformat_input_t *input)
Definition: init.h:61
clib_error_t * vlib_call_init_exit_functions(struct vlib_main_t *vm, _vlib_init_function_list_elt_t *head, int call_once)
Definition: init.c:43
struct _unformat_input_t unformat_input_t
vlib_main_t * vm
Definition: buffer.c:294
clib_error_t *( vlib_init_function_t)(struct vlib_main_t *vm)
Definition: init.h:51
struct vlib_config_function_runtime_t vlib_config_function_runtime_t
clib_error_t * vlib_call_all_config_functions(struct vlib_main_t *vm, unformat_input_t *input, int is_early)
Definition: init.c:94
clib_error_t * vlib_call_all_main_loop_enter_functions(struct vlib_main_t *vm)
Definition: init.c:80
struct vlib_config_function_runtime_t * next_registration
Definition: init.h:73