aboutsummaryrefslogtreecommitdiffstats
path: root/vlib/vlib/main.h
blob: d9ac1445ddd1eb8c53a5967dcb878b81234396c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * main.h: VLIB main data structure
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef included_vlib_main_h
#define included_vlib_main_h

#include <vppinfra/elog.h>
#include <vppinfra/format.h>
#include <vppinfra/longjmp.h>
#include <vppinfra/pool.h>
#include <vppinfra/random_buffer.h>
#include <vppinfra/time.h>

#include <pthread.h>


/* By default turn off node/error event logging.
   Override with -DVLIB_ELOG_MAIN_LOOP */
#ifndef VLIB_ELOG_MAIN_LOOP
#define VLIB_ELOG_MAIN_LOOP 0
#endif

typedef struct vlib_main_t
{
  /* Instruction level timing state. */
  clib_time_t clib_time;

  /* Time stamp of last node dispatch. */
  u64 cpu_time_last_node_dispatch;

  /* Time stamp when main loop was entered (time 0). */
  u64 cpu_time_main_loop_start;

  /* Incremented once for each main loop. */
  u32 main_loop_count;

  /* Count of vectors processed this main loop. */
  u32 main_loop_vectors_processed;
  u32 main_loop_nodes_processed;

  /* Circular buffer of input node vector counts.
     Indexed by low bits of
     (main_loop_count >> VLIB_LOG2_INPUT_VECTORS_PER_MAIN_LOOP). */
  u32 vector_counts_per_main_loop[2];
  u32 node_counts_per_main_loop[2];

  /* Every so often we switch to the next counter. */
#define VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE 7

  /* Jump target to exit main loop with given code. */
  u32 main_loop_exit_set;
  clib_longjmp_t main_loop_exit;
#define VLIB_MAIN_LOOP_EXIT_NONE 0
#define VLIB_MAIN_LOOP_EXIT_PANIC 1
  /* Exit via CLI. */
#define VLIB_MAIN_LOOP_EXIT_CLI 2

  /* Error marker to use when exiting main loop. */
  clib_error_t *main_loop_error;

  /* Name for e.g. syslog. */
  char *name;

  /* Start and size of CLIB heap. */
  void *heap_base;
  uword heap_size;

  vlib_buffer_main_t *buffer_main;

  vlib_physmem_main_t physmem_main;

  /* Allocate/free buffer memory for DMA transfers, descriptor rings, etc.
     buffer memory is guaranteed to be cache-aligned. */
  void *(*os_physmem_alloc_aligned) (vlib_physmem_main_t * pm,
				     uword n_bytes, uword alignment);
  void (*os_physmem_free) (void *x);

  /* Node graph main structure. */
  vlib_node_main_t node_main;

  /* Command line interface. */
  vlib_cli_main_t cli_main;

  /* Packet trace buffer. */
  vlib_trace_main_t trace_main;

  /* Error handling. */
  vlib_error_main_t error_main;

  /* Punt packets to underlying operating system for when fast switching
     code does not know what to do. */
  void (*os_punt_frame) (struct vlib_main_t * vm,
			 struct vlib_node_runtime_t * node,
			 vlib_frame_t * frame);

  /* Multicast distribution.  Set to zero for MC disabled. */
  mc_main_t *mc_main;

  /* Stream index to use for distribution when MC is enabled. */
  u32 mc_stream_index;

  vlib_one_time_waiting_process_t *procs_waiting_for_mc_stream_join;

  /* Event logger. */
  elog_main_t elog_main;

  /* Node call and return event types. */
  elog_event_type_t *node_call_elog_event_types;
  elog_event_type_t *node_return_elog_event_types;

  elog_event_type_t *error_elog_event_types;

  /* Seed for random number generator. */
  uword random_seed;

  /* Buffer of random data for various uses. */
  clib_random_buffer_t random_buffer;

  /* Hash table to record which init functions have been called. */
  uword *init_functions_called;

  /* to compare with node runtime */
  u32 cpu_index;

  void **mbuf_alloc_list;

  /* List of init functions to call, setup by constructors */
  _vlib_init_function_list_elt_t *init_function_registrations;
  _vlib_init_function_list_elt_t *main_loop_enter_function_registrations;
  _vlib_init_function_list_elt_t *main_loop_exit_function_registrations;
  _vlib_init_function_list_elt_t *api_init_function_registrations;
  vlib_config_function_runtime_t *config_function_registrations;
  mc_serialize_msg_t *mc_msg_registrations;	/* mc_main is a pointer... */

  /* control-plane API queue signal pending, length indication */
  volatile u32 queue_signal_pending;
  volatile u32 api_queue_nonempty;
  void (*queue_signal_callback) (struct vlib_main_t *);
  u8 **argv;
} vlib_main_t;

/* Global main structure. */
extern vlib_main_t vlib_global_main;

always_inline f64
vlib_time_now (vlib_main_t * vm)
{
  return clib_time_now (&vm->clib_time);
}

always_inline f64
vlib_time_now_ticks (vlib_main_t * vm, u64 n)
{
  return clib_time_now_internal (&vm->clib_time, n);
}

/* Busy wait for specified time. */
always_inline void
vlib_time_wait (vlib_main_t * vm, f64 wait)
{
  f64 t = vlib_time_now (vm);
  f64 limit = t + wait;
  while (t < limit)
    t = vlib_time_now (vm);
}

/* Time a piece of code. */
#define vlib_time_code(vm,body)			\
do {						\
    f64 _t[2];					\
    _t[0] = vlib_time_now (vm);			\
    do { body; } while (0);			\
    _t[1] = vlib_time_now (vm);			\
    clib_warning ("%.7e", _t[1] - _t[0]);	\
} while (0)

#define vlib_wait_with_timeout(vm,suspend_time,timeout_time,test)	\
({									\
    uword __vlib_wait_with_timeout = 0;					\
    f64 __vlib_wait_time = 0;						\
    while (! (__vlib_wait_with_timeout = (test))			\
	   && __vlib_wait_time < (timeout_time))			\
      {									\
	vlib_process_suspend (vm, suspend_time);			\
	__vlib_wait_time += suspend_time;				\
      }									\
    __vlib_wait_with_timeout;						\
})

always_inline void
vlib_panic_with_error (vlib_main_t * vm, clib_error_t * error)
{
  vm->main_loop_error = error;
  clib_longjmp (&vm->main_loop_exit, VLIB_MAIN_LOOP_EXIT_PANIC);
}

#define vlib_panic_with_msg(vm,args...) \
  vlib_panic_with_error (vm, clib_error_return (0, args))

always_inline void
vlib_panic (vlib_main_t * vm)
{
  vlib_panic_with_error (vm, 0);
}

always_inline u32
vlib_vector_input_stats_index (vlib_main_t * vm, word delta)
{
  u32 i;
  i = vm->main_loop_count >> VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE;
  ASSERT (is_pow2 (ARRAY_LEN (vm->vector_counts_per_main_loop)));
  return (i + delta) & (ARRAY_LEN (vm->vector_counts_per_main_loop) - 1);
}

/* Estimate input rate based on previous
   2^VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE
   samples. */
always_inline u32
vlib_last_vectors_per_main_loop (vlib_main_t * vm)
{
  u32 i = vlib_vector_input_stats_index (vm, -1);
  u32 n = vm->vector_counts_per_main_loop[i];
  return n >> VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE;
}

/* Total ave vector count per iteration of main loop. */
always_inline f64
vlib_last_vectors_per_main_loop_as_f64 (vlib_main_t * vm)
{
  u32 i = vlib_vector_input_stats_index (vm, -1);
  u32 v = vm->vector_counts_per_main_loop[i];
  return (f64) v / (f64) (1 << VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE);
}

/* Total ave vectors/node count per iteration of main loop. */
always_inline f64
vlib_last_vector_length_per_node (vlib_main_t * vm)
{
  u32 i = vlib_vector_input_stats_index (vm, -1);
  u32 v = vm->vector_counts_per_main_loop[i];
  u32 n = vm->node_counts_per_main_loop[i];
  return n == 0 ? 0 : (f64) v / (f64) n;
}

extern u32 wraps;

always_inline void
vlib_increment_main_loop_counter (vlib_main_t * vm)
{
  u32 i, c, n, v, is_wrap;

  c = vm->main_loop_count++;

  is_wrap = (c & pow2_mask (VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE)) == 0;

  if (is_wrap)
    wraps++;

  i = vlib_vector_input_stats_index (vm, /* delta */ is_wrap);

  v = is_wrap ? 0 : vm->vector_counts_per_main_loop[i];
  n = is_wrap ? 0 : vm->node_counts_per_main_loop[i];

  v += vm->main_loop_vectors_processed;
  n += vm->main_loop_nodes_processed;
  vm->main_loop_vectors_processed = 0;
  vm->main_loop_nodes_processed = 0;
  vm->vector_counts_per_main_loop[i] = v;
  vm->node_counts_per_main_loop[i] = n;
}

always_inline void vlib_set_queue_signal_callback
  (vlib_main_t * vm, void (*fp) (vlib_main_t *))
{
  vm->queue_signal_callback = fp;
}

/* Main routine. */
int vlib_main (vlib_main_t * vm, unformat_input_t * input);

/* Thread stacks, for os_get_cpu_number */
extern u8 **vlib_thread_stacks;

/* Number of thread stacks that the application needs */
u32 vlib_app_num_thread_stacks_needed (void) __attribute__ ((weak));

extern void vlib_node_sync_stats (vlib_main_t * vm, vlib_node_t * n);

#endif /* included_vlib_main_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */