FD.io VPP  v17.01.1-3-gc6833f8
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 
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_INIT_FUNCTION_SYMBOL(x, type) \
83  _vlib_##type##_function_##x
84 
85 #define VLIB_INIT_FUNCTION_SYMBOL(x) \
86  _VLIB_INIT_FUNCTION_SYMBOL(x, init)
87 #define VLIB_MAIN_LOOP_ENTER_FUNCTION_SYMBOL(x) \
88  _VLIB_INIT_FUNCTION_SYMBOL(x, main_loop_enter)
89 #define VLIB_MAIN_LOOP_EXIT_FUNCTION_SYMBOL(x) \
90  _VLIB_INIT_FUNCTION_SYMBOL(x, main_loop_exit)
91 #define VLIB_CONFIG_FUNCTION_SYMBOL(x) \
92  _VLIB_INIT_FUNCTION_SYMBOL(x, config)
93 
94 /* Declaration is global (e.g. not static) so that init functions can
95  be called from other modules to resolve init function depend. */
96 
97 #define VLIB_DECLARE_INIT_FUNCTION(x, tag) \
98 vlib_init_function_t * _VLIB_INIT_FUNCTION_SYMBOL (x, tag) = x; \
99 static void __vlib_add_##tag##_function_##x (void) \
100  __attribute__((__constructor__)) ; \
101 static void __vlib_add_##tag##_function_##x (void) \
102 { \
103  vlib_main_t * vm = vlib_get_main(); \
104  static _vlib_init_function_list_elt_t _vlib_init_function; \
105  _vlib_init_function.next_init_function \
106  = vm->tag##_function_registrations; \
107  vm->tag##_function_registrations = &_vlib_init_function; \
108  _vlib_init_function.f = &x; \
109 }
110 
111 #define VLIB_INIT_FUNCTION(x) VLIB_DECLARE_INIT_FUNCTION(x,init)
112 
113 #define VLIB_MAIN_LOOP_ENTER_FUNCTION(x) \
114  VLIB_DECLARE_INIT_FUNCTION(x,main_loop_enter)
115 #define VLIB_MAIN_LOOP_EXIT_FUNCTION(x) \
116 VLIB_DECLARE_INIT_FUNCTION(x,main_loop_exit)
117 
118 #define VLIB_CONFIG_FUNCTION(x,n,...) \
119  __VA_ARGS__ vlib_config_function_runtime_t \
120  VLIB_CONFIG_FUNCTION_SYMBOL(x); \
121 static void __vlib_add_config_function_##x (void) \
122  __attribute__((__constructor__)) ; \
123 static void __vlib_add_config_function_##x (void) \
124 { \
125  vlib_main_t * vm = vlib_get_main(); \
126  VLIB_CONFIG_FUNCTION_SYMBOL(x).next_registration \
127  = vm->config_function_registrations; \
128  vm->config_function_registrations \
129  = &VLIB_CONFIG_FUNCTION_SYMBOL(x); \
130 } \
131  vlib_config_function_runtime_t \
132  VLIB_CONFIG_FUNCTION_SYMBOL (x) \
133  = { \
134  .name = n, \
135  .function = x, \
136  .is_early = 0, \
137  }
138 
139 #define VLIB_EARLY_CONFIG_FUNCTION(x,n,...) \
140  __VA_ARGS__ vlib_config_function_runtime_t \
141  VLIB_CONFIG_FUNCTION_SYMBOL(x); \
142 static void __vlib_add_config_function_##x (void) \
143  __attribute__((__constructor__)) ; \
144 static void __vlib_add_config_function_##x (void) \
145 { \
146  vlib_main_t * vm = vlib_get_main(); \
147  VLIB_CONFIG_FUNCTION_SYMBOL(x).next_registration \
148  = vm->config_function_registrations; \
149  vm->config_function_registrations \
150  = &VLIB_CONFIG_FUNCTION_SYMBOL(x); \
151 } \
152  vlib_config_function_runtime_t \
153  VLIB_CONFIG_FUNCTION_SYMBOL (x) \
154  = { \
155  .name = n, \
156  .function = x, \
157  .is_early = 1, \
158  }
159 
160 /* Call given init function: used for init function dependencies. */
161 #define vlib_call_init_function(vm, x) \
162  ({ \
163  extern vlib_init_function_t * VLIB_INIT_FUNCTION_SYMBOL (x); \
164  vlib_init_function_t * _f = VLIB_INIT_FUNCTION_SYMBOL (x); \
165  clib_error_t * _error = 0; \
166  if (! hash_get (vm->init_functions_called, _f)) \
167  { \
168  hash_set1 (vm->init_functions_called, _f); \
169  _error = _f (vm); \
170  } \
171  _error; \
172  })
173 
174 /* Don't call given init function: used to suppress parts of the netstack */
175 #define vlib_mark_init_function_complete(vm, x) \
176  ({ \
177  extern vlib_init_function_t * VLIB_INIT_FUNCTION_SYMBOL (x); \
178  vlib_init_function_t * _f = VLIB_INIT_FUNCTION_SYMBOL (x); \
179  hash_set1 (vm->init_functions_called, _f); \
180  })
181 
182 #define vlib_call_post_graph_init_function(vm, x) \
183  ({ \
184  extern vlib_init_function_t * VLIB_POST_GRAPH_INIT_FUNCTION_SYMBOL (x); \
185  vlib_init_function_t * _f = VLIB_POST_GRAPH_INIT_FUNCTION_SYMBOL (x); \
186  clib_error_t * _error = 0; \
187  if (! hash_get (vm->init_functions_called, _f)) \
188  { \
189  hash_set1 (vm->init_functions_called, _f); \
190  _error = _f (vm); \
191  } \
192  _error; \
193  })
194 
195 #define vlib_call_config_function(vm, x) \
196  ({ \
197  vlib_config_function_runtime_t * _r; \
198  clib_error_t * _error = 0; \
199  extern vlib_config_function_runtime_t \
200  VLIB_CONFIG_FUNCTION_SYMBOL (x); \
201  \
202  _r = &VLIB_CONFIG_FUNCTION_SYMBOL (x); \
203  if (! hash_get (vm->init_functions_called, _r->function)) \
204  { \
205  hash_set1 (vm->init_functions_called, _r->function); \
206  _error = _r->function (vm, &_r->input); \
207  } \
208  _error; \
209  })
210 
211 /* External functions. */
215  int is_early);
217  *vm);
220  _vlib_init_function_list_elt_t *
221  head, int call_once);
222 
223 #define foreach_vlib_module_reference \
224  _ (node_cli) \
225  _ (trace_cli)
226 
227 /* Dummy function to get node_cli.c linked in. */
228 #define _(x) void vlib_##x##_reference (void);
230 #undef _
231 #endif /* included_vlib_init_h */
232 /*
233  * fd.io coding-style-patch-verification: ON
234  *
235  * Local Variables:
236  * eval: (c-set-style "gnu")
237  * End:
238  */
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:223
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
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
unsigned char u8
Definition: types.h:56
struct vlib_config_function_runtime_t * next_registration
Definition: init.h:73
struct _unformat_input_t unformat_input_t