aboutsummaryrefslogtreecommitdiffstats
path: root/src/vlib/node.h
blob: aae5103908dc900d992d50b40ce1cdf64461f0d0 (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
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
/*
 * 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.
 */
/*
 * node.h: VLIB processing nodes
 *
 * 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_node_h
#define included_vlib_node_h

#include <vppinfra/cpu.h>
#include <vppinfra/longjmp.h>
#include <vppinfra/lock.h>
#include <vlib/trace.h>		/* for vlib_trace_filter_t */

/* Forward declaration. */
struct vlib_node_runtime_t;
struct vlib_frame_t;

/* Internal nodes (including output nodes) move data from node to
   node (or out of the graph for output nodes). */
typedef uword (vlib_node_function_t) (struct vlib_main_t * vm,
				      struct vlib_node_runtime_t * node,
				      struct vlib_frame_t * frame);

typedef enum
{
  VLIB_NODE_PROTO_HINT_NONE = 0,
  VLIB_NODE_PROTO_HINT_ETHERNET,
  VLIB_NODE_PROTO_HINT_IP4,
  VLIB_NODE_PROTO_HINT_IP6,
  VLIB_NODE_PROTO_HINT_TCP,
  VLIB_NODE_PROTO_HINT_UDP,
  VLIB_NODE_N_PROTO_HINTS,
} vlib_node_proto_hint_t;

typedef enum
{
  /* An internal node on the call graph (could be output). */
  VLIB_NODE_TYPE_INTERNAL,

  /* Nodes which input data into the processing graph.
     Input nodes are called for each iteration of main loop. */
  VLIB_NODE_TYPE_INPUT,

  /* Nodes to be called before all input nodes.
     Used, for example, to clean out driver TX rings before
     processing input. */
  VLIB_NODE_TYPE_PRE_INPUT,

  /* "Process" nodes which can be suspended and later resumed. */
  VLIB_NODE_TYPE_PROCESS,

  VLIB_N_NODE_TYPE,
} vlib_node_type_t;

typedef struct _vlib_node_fn_registration
{
  vlib_node_function_t *function;
  clib_march_variant_type_t march_variant;
  struct _vlib_node_fn_registration *next_registration;
} vlib_node_fn_registration_t;

typedef struct _vlib_node_registration
{
  /* Vector processing function for this node. */
  vlib_node_function_t *function;

  /* Node function candidate registration with priority */
  vlib_node_fn_registration_t *node_fn_registrations;

  /* Node name. */
  char *name;

  /* Name of sibling (if applicable). */
  char *sibling_of;

  /* Node index filled in by registration. */
  u32 index;

  /* Type of this node. */
  vlib_node_type_t type;

  /* Error strings indexed by error code for this node. */
  char **error_strings;
  vl_counter_t *error_counters;

  /* Buffer format/unformat for this node. */
  format_function_t *format_buffer;
  unformat_function_t *unformat_buffer;

  /* Trace format/unformat for this node. */
  format_function_t *format_trace;
  unformat_function_t *unformat_trace;

  /* Function to validate incoming frames. */
  u8 *(*validate_frame) (struct vlib_main_t * vm,
			 struct vlib_node_runtime_t *,
			 struct vlib_frame_t * f);

  /* Per-node runtime data. */
  void *runtime_data;

  /* Process stack size. */
  u16 process_log2_n_stack_bytes;

  /* Number of bytes of per-node run time data. */
  u8 runtime_data_bytes;

  /* State for input nodes. */
  u8 state;

  /* Node flags. */
  u16 flags;

  /* protocol at b->data[b->current_data] upon entry to the dispatch fn */
  u8 protocol_hint;

  /* Size of scalar and vector arguments in bytes. */
  u16 scalar_size, vector_size;

  /* Number of error codes used by this node. */
  u16 n_errors;

  /* Number of next node names that follow. */
  u16 n_next_nodes;

  /* Constructor link-list, don't ask... */
  struct _vlib_node_registration *next_registration;

  /* Names of next nodes which this node feeds into. */
  char *next_nodes[];

} vlib_node_registration_t;

#ifndef CLIB_MARCH_VARIANT
#define VLIB_REGISTER_NODE(x,...)                                       \
    __VA_ARGS__ vlib_node_registration_t x;                             \
static void __vlib_add_node_registration_##x (void)                     \
    __attribute__((__constructor__)) ;                                  \
static void __vlib_add_node_registration_##x (void)                     \
{                                                                       \
    vlib_main_t * vm = vlib_get_main();                                 \
    x.next_registration = vm->node_main.node_registrations;             \
    vm->node_main.node_registrations = &x;                              \
}                                                                       \
static void __vlib_rm_node_registration_##x (void)                      \
    __attribute__((__destructor__)) ;                                   \
static void __vlib_rm_node_registration_##x (void)                      \
{                                                                       \
    vlib_main_t * vm = vlib_get_main();                                 \
    VLIB_REMOVE_FROM_LINKED_LIST (vm->node_main.node_registrations,     \
                                  &x, next_registration);               \
}                                                                       \
__VA_ARGS__ vlib_node_registration_t x
#else
#define VLIB_REGISTER_NODE(x,...)                                       \
STATIC_ASSERT (sizeof(# __VA_ARGS__) != 7,"node " #x " must not be declared as static"); \
static __clib_unused vlib_node_registration_t __clib_unused_##x
#endif

#ifndef CLIB_MARCH_VARIANT
#define CLIB_MARCH_VARIANT_STR "default"
#else
#define _CLIB_MARCH_VARIANT_STR(s) __CLIB_MARCH_VARIANT_STR(s)
#define __CLIB_MARCH_VARIANT_STR(s) #s
#define CLIB_MARCH_VARIANT_STR _CLIB_MARCH_VARIANT_STR(CLIB_MARCH_VARIANT)
#endif

#define VLIB_NODE_FN(node)                                                    \
  uword CLIB_MARCH_SFX (node##_fn) ();                                        \
  static vlib_node_fn_registration_t CLIB_MARCH_SFX (                         \
    node##_fn_registration) = {                                               \
    .function = &CLIB_MARCH_SFX (node##_fn),                                  \
  };                                                                          \
                                                                              \
  static void __clib_constructor CLIB_MARCH_SFX (node##_multiarch_register) ( \
    void)                                                                     \
  {                                                                           \
    extern vlib_node_registration_t node;                                     \
    vlib_node_fn_registration_t *r;                                           \
    r = &CLIB_MARCH_SFX (node##_fn_registration);                             \
    r->march_variant = CLIB_MARCH_SFX (CLIB_MARCH_VARIANT_TYPE);              \
    r->next_registration = node.node_fn_registrations;                        \
    node.node_fn_registrations = r;                                           \
  }                                                                           \
  uword CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (node##_fn)

unformat_function_t unformat_vlib_node_variant;

typedef struct
{
  /* Total calls, clock ticks and vector elements processed for this node. */
  u64 calls, vectors, clocks, suspends;
  u64 max_clock;
  u64 max_clock_n;
} vlib_node_stats_t;

#define foreach_vlib_node_state					\
  /* Input node is called each iteration of main loop.		\
     This is the default (zero). */				\
  _ (POLLING)							\
  /* Input node is called when device signals an interrupt. */	\
  _ (INTERRUPT)							\
  /* Input node is never called. */				\
  _ (DISABLED)

typedef enum
{
#define _(f) VLIB_NODE_STATE_##f,
  foreach_vlib_node_state
#undef _
    VLIB_N_NODE_STATE,
} vlib_node_state_t;

typedef struct vlib_node_t
{
  /* Vector processing function for this node. */
  vlib_node_function_t *function;

  /* Node name. */
  u8 *name;

  /* Node name index in elog string table. */
  u32 name_elog_string;

  /* Total statistics for this node. */
  vlib_node_stats_t stats_total;

  /* Saved values as of last clear (or zero if never cleared).
     Current values are always stats_total - stats_last_clear. */
  vlib_node_stats_t stats_last_clear;

  /* Type of this node. */
  vlib_node_type_t type;

  /* Node index. */
  u32 index;

  /* Index of corresponding node runtime. */
  u32 runtime_index;

  /* Runtime data for this node. */
  void *runtime_data;

  /* Node flags. */
  u16 flags;

  /* Processing function keeps frame.  Tells node dispatching code not
     to free frame after dispatch is done.  */
#define VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH (1 << 0)

  /* Node counts as output/drop/punt node for stats purposes. */
#define VLIB_NODE_FLAG_IS_OUTPUT (1 << 1)
#define VLIB_NODE_FLAG_IS_DROP (1 << 2)
#define VLIB_NODE_FLAG_IS_PUNT (1 << 3)
#define VLIB_NODE_FLAG_IS_HANDOFF (1 << 4)

  /* Set if current node runtime has traced vectors. */
#define VLIB_NODE_FLAG_TRACE (1 << 5)

#define VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE (1 << 6)
#define VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE (1 << 7)
#define VLIB_NODE_FLAG_TRACE_SUPPORTED (1 << 8)
#define VLIB_NODE_FLAG_ADAPTIVE_MODE			     (1 << 9)

  /* State for input nodes. */
  u8 state;

  /* Number of bytes of run time data. */
  u8 runtime_data_bytes;

  /* protocol at b->data[b->current_data] upon entry to the dispatch fn */
  u8 protocol_hint;

  /* Number of error codes used by this node. */
  u16 n_errors;

  /* Size of scalar and vector arguments in bytes. */
  u16 scalar_size, vector_size;

  /* Handle/index in error heap for this node. */
  u32 error_heap_handle;
  u32 error_heap_index;

  /* Counter structures indexed by counter code for this node. */
  vl_counter_t *error_counters;

  /* Vector of next node names.
     Only used before next_nodes array is initialized. */
  char **next_node_names;

  /* Next node indices for this node. */
  u32 *next_nodes;

  /* Name of node that we are sibling of. */
  char *sibling_of;

  /* Bitmap of all of this node's siblings. */
  uword *sibling_bitmap;

  /* Total number of vectors sent to each next node. */
  u64 *n_vectors_by_next_node;

  /* Hash table mapping next node index into slot in
     next_nodes vector.  Quickly determines whether this node
     is connected to given next node and, if so, with which slot. */
  uword *next_slot_by_node;

  /* Bitmap of node indices which feed this node. */
  uword *prev_node_bitmap;

  /* Node/next-index which own enqueue rights with to this node. */
  u32 owner_node_index, owner_next_index;

  /* Buffer format/unformat for this node. */
  format_function_t *format_buffer;
  unformat_function_t *unformat_buffer;

  /* Trace buffer format/unformat for this node. */
  format_function_t *format_trace;

  /* Function to validate incoming frames. */
  u8 *(*validate_frame) (struct vlib_main_t * vm,
			 struct vlib_node_runtime_t *,
			 struct vlib_frame_t * f);
  /* for pretty-printing, not typically valid */
  u8 *state_string;

  /* Node function candidate registration with priority */
  vlib_node_fn_registration_t *node_fn_registrations;
} vlib_node_t;

#define VLIB_INVALID_NODE_INDEX ((u32) ~0)

/* Max number of vector elements to process at once per node. */
#define VLIB_FRAME_SIZE 256
#define VLIB_FRAME_ALIGN CLIB_CACHE_LINE_BYTES

/* Calling frame (think stack frame) for a node. */
typedef struct vlib_frame_t
{
  /* Frame flags. */
  u16 frame_flags;

  /* User flags. Used for sending hints to the next node. */
  u16 flags;

  /* Number of scalar bytes in arguments. */
  u8 scalar_size;

  /* Number of bytes per vector argument. */
  u8 vector_size;

  /* Number of vector elements currently in frame. */
  u16 n_vectors;

  /* Scalar and vector arguments to next node. */
  u8 arguments[0];
} vlib_frame_t;

typedef struct
{
  /* Frame pointer. */
  vlib_frame_t *frame;

  /* Node runtime for this next. */
  u32 node_runtime_index;

  /* Next frame flags. */
  u32 flags;

  /* Reflects node frame-used flag for this next. */
#define VLIB_FRAME_NO_FREE_AFTER_DISPATCH \
  VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH

  /* Don't append this frame */
#define VLIB_FRAME_NO_APPEND (1 << 14)

  /* This next frame owns enqueue to node
     corresponding to node_runtime_index. */
#define VLIB_FRAME_OWNER (1 << 15)

  /* Set when frame has been allocated for this next. */
#define VLIB_FRAME_IS_ALLOCATED	VLIB_NODE_FLAG_IS_OUTPUT

  /* Set when frame has been added to pending vector. */
#define VLIB_FRAME_PENDING VLIB_NODE_FLAG_IS_DROP

  /* Set when frame is to be freed after dispatch. */
#define VLIB_FRAME_FREE_AFTER_DISPATCH VLIB_NODE_FLAG_IS_PUNT

  /* Set when frame has traced packets. */
#define VLIB_FRAME_TRACE VLIB_NODE_FLAG_TRACE

  /* Number of vectors enqueue to this next since last overflow. */
  u32 vectors_since_last_overflow;
} vlib_next_frame_t;

always_inline void
vlib_next_frame_init (vlib_next_frame_t * nf)
{
  clib_memset (nf, 0, sizeof (nf[0]));
  nf->node_runtime_index = ~0;
}

/* A frame pending dispatch by main loop. */
typedef struct
{
  /* Node and runtime for this frame. */
  u32 node_runtime_index;

  /* Frame index (in the heap). */
  vlib_frame_t *frame;

  /* Start of next frames for this node. */
  u32 next_frame_index;

  /* Special value for next_frame_index when there is no next frame. */
#define VLIB_PENDING_FRAME_NO_NEXT_FRAME ((u32) ~0)
} vlib_pending_frame_t;

typedef struct vlib_node_runtime_t
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);	/**< cacheline mark */

  vlib_node_function_t *function;	/**< Node function to call. */

  vlib_error_t *errors;			/**< Vector of errors for this node. */

  u32 clocks_since_last_overflow;	/**< Number of clock cycles. */

  u32 max_clock;			/**< Maximum clock cycle for an
					  invocation. */

  u32 max_clock_n;			/**< Number of vectors in the recorded
					  max_clock. */

  u32 calls_since_last_overflow;	/**< Number of calls. */

  u32 vectors_since_last_overflow;	/**< Number of vector elements
					  processed by this node. */

  u32 next_frame_index;			/**< Start of next frames for this
					  node. */

  u32 node_index;			/**< Node index. */

  u32 input_main_loops_per_call;	/**< For input nodes: decremented
					  on each main loop interation until
					  it reaches zero and function is
					  called.  Allows some input nodes to
					  be called more than others. */

  u32 main_loop_count_last_dispatch;	/**< Saved main loop counter of last
					  dispatch of this node. */

  u32 main_loop_vector_stats[2];

  u16 flags;				/**< Copy of main node flags. */

  u16 state;				/**< Input node state. */

  u16 n_next_nodes;

  u16 cached_next_index;		/**< Next frame index that vector
					  arguments were last enqueued to
					  last time this node ran. Set to
					  zero before first run of this
					  node. */

  u16 thread_index;			/**< thread this node runs on */

  u8 runtime_data[0];			/**< Function dependent
					  node-runtime data. This data is
					  thread local, and it is not
					  cloned from main thread. It needs
					  to be initialized for each thread
					  before it is used unless
					  runtime_data template exists in
					  vlib_node_t. */
}
vlib_node_runtime_t;

#define VLIB_NODE_RUNTIME_DATA_SIZE	(sizeof (vlib_node_runtime_t) - STRUCT_OFFSET_OF (vlib_node_runtime_t, runtime_data))

typedef struct
{
  /* Number of allocated frames for this scalar/vector size. */
  u32 n_alloc_frames;

  /* Vector of free frames for this scalar/vector size. */
  vlib_frame_t **free_frames;
} vlib_frame_size_t;

typedef struct
{
  /* Users opaque value for event type. */
  uword opaque;
} vlib_process_event_type_t;

typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  /* Node runtime for this process. */
  vlib_node_runtime_t node_runtime;

  /* Where to longjmp when process is done. */
  clib_longjmp_t return_longjmp;

#define VLIB_PROCESS_RETURN_LONGJMP_RETURN ((uword) ~0 - 0)
#define VLIB_PROCESS_RETURN_LONGJMP_SUSPEND ((uword) ~0 - 1)

  /* Where to longjmp to resume node after suspend. */
  clib_longjmp_t resume_longjmp;
#define VLIB_PROCESS_RESUME_LONGJMP_SUSPEND 0
#define VLIB_PROCESS_RESUME_LONGJMP_RESUME  1

  u16 flags;
#define VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK (1 << 0)
#define VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_EVENT (1 << 1)
  /* Set to indicate that this process has been added to resume vector. */
#define VLIB_PROCESS_RESUME_PENDING (1 << 2)

  /* Process function is currently running. */
#define VLIB_PROCESS_IS_RUNNING (1 << 3)

  /* Size of process stack. */
  u16 log2_n_stack_bytes;

  u32 suspended_process_frame_index;

  /* Number of times this process was suspended. */
  u32 n_suspends;

  /* Vectors of pending event data indexed by event type index. */
  void **pending_event_data_by_type_index;

  /* Bitmap of event type-indices with non-empty vectors. */
  uword *non_empty_event_type_bitmap;

  /* Bitmap of event type-indices which are one time events. */
  uword *one_time_event_type_bitmap;

  /* Type is opaque pointer -- typically a pointer to an event handler
     function.  Hash table to map opaque to a type index. */
  uword *event_type_index_by_type_opaque;

  /* Pool of currently valid event types. */
  vlib_process_event_type_t *event_type_pool;

  /*
   * When suspending saves clock time (10us ticks) when process
   * is to be resumed.
   */
  u64 resume_clock_interval;

  /* Handle from timer code, to cancel an unexpired timer */
  u32 stop_timer_handle;

  /* Default output function and its argument for any CLI outputs
     within the process. */
  vlib_cli_output_function_t *output_function;
  uword output_function_arg;

  /* Process stack */
#define VLIB_PROCESS_STACK_MAGIC (0xdead7ead)
  u32 *stack;
} vlib_process_t;

typedef struct
{
  u32 node_index;

  u32 one_time_event;
} vlib_one_time_waiting_process_t;

typedef struct
{
  u16 n_data_elts;

  u16 n_data_elt_bytes;

  /* n_data_elts * n_data_elt_bytes */
  u32 n_data_bytes;

  /* Process node & event type to be used to signal event. */
  u32 process_node_index;

  u32 event_type_index;

  union
  {
    u8 inline_event_data[64 - 3 * sizeof (u32) - 2 * sizeof (u16)];

    /* Vector of event data used only when data does not fit inline. */
    u8 *event_data_as_vector;
  };
}
vlib_signal_timed_event_data_t;

always_inline uword
vlib_timing_wheel_data_is_timed_event (u32 d)
{
  return d & 1;
}

always_inline u32
vlib_timing_wheel_data_set_suspended_process (u32 i)
{
  return 0 + 2 * i;
}

always_inline u32
vlib_timing_wheel_data_set_timed_event (u32 i)
{
  return 1 + 2 * i;
}

always_inline uword
vlib_timing_wheel_data_get_index (u32 d)
{
  return d / 2;
}

typedef struct
{
  clib_march_variant_type_t index;
  int priority;
  char *suffix;
  char *desc;
} vlib_node_fn_variant_t;

typedef struct
{
  /* Public nodes. */
  vlib_node_t **nodes;

  /* Node index hashed by node name. */
  uword *node_by_name;

  u32 flags;
#define VLIB_NODE_MAIN_RUNTIME_STARTED (1 << 0)

  /* Nodes segregated by type for cache locality.
     Does not apply to nodes of type VLIB_NODE_TYPE_INTERNAL. */
  vlib_node_runtime_t *nodes_by_type[VLIB_N_NODE_TYPE];

  /* Node runtime indices for input nodes with pending interrupts. */
  void *interrupts;
  volatile u32 *pending_interrupts;

  /* Input nodes are switched from/to interrupt to/from polling mode
     when average vector length goes above/below polling/interrupt
     thresholds. */
  u32 polling_threshold_vector_length;
  u32 interrupt_threshold_vector_length;

  /* Vector of next frames. */
  vlib_next_frame_t *next_frames;

  /* Vector of internal node's frames waiting to be called. */
  vlib_pending_frame_t *pending_frames;

  /* Timing wheel for scheduling time-based node dispatch. */
  void *timing_wheel;

  vlib_signal_timed_event_data_t *signal_timed_event_data_pool;

  /* Opaque data vector added via timing_wheel_advance. */
  u32 *data_from_advancing_timing_wheel;

  /* CPU time of next process to be ready on timing wheel. */
  f64 time_next_process_ready;

  /* Vector of process nodes.
     One for each node of type VLIB_NODE_TYPE_PROCESS. */
  vlib_process_t **processes;

  /* Current running process or ~0 if no process running. */
  u32 current_process_index;

  /* Pool of pending process frames. */
  vlib_pending_frame_t *suspended_process_frames;

  /* Vector of event data vectors pending recycle. */
  void **recycled_event_data_vectors;

  /* Current counts of nodes in each state. */
  u32 input_node_counts_by_state[VLIB_N_NODE_STATE];

  /* Hash of (scalar_size,vector_size) to frame_sizes index. */
  uword *frame_size_hash;

  /* Per-size frame allocation information. */
  vlib_frame_size_t *frame_sizes;

  /* Time of last node runtime stats clear. */
  f64 time_last_runtime_stats_clear;

  /* Node registrations added by constructors */
  vlib_node_registration_t *node_registrations;

  /* Node index from error code */
  u32 *node_by_error;

  /* Node Function Variants */
  vlib_node_fn_variant_t *variants;

  /* Node Function Default Variant Index */
  u32 node_fn_default_march_variant;

  /* Node Function march Variant by Suffix Hash */
  uword *node_fn_march_variant_by_suffix;
} vlib_node_main_t;

typedef u16 vlib_error_t;

always_inline u32
vlib_error_get_node (vlib_node_main_t * nm, vlib_error_t e)
{
  return nm->node_by_error[e];
}

always_inline u32
vlib_error_get_code (vlib_node_main_t * nm, vlib_error_t e)
{
  u32 node_index = nm->node_by_error[e];
  vlib_node_t *n = nm->nodes[node_index];
  u32 error_code = e - n->error_heap_index;
  return error_code;
}

#define FRAME_QUEUE_MAX_NELTS 64
typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  u64 head;
  u64 head_hint;
  u64 tail;
  u32 n_in_use;
  u32 nelts;
  u32 written;
  u32 threshold;
  i32 n_vectors[FRAME_QUEUE_MAX_NELTS];
} frame_queue_trace_t;

typedef struct
{
  u64 count[FRAME_QUEUE_MAX_NELTS];
} frame_queue_nelt_counter_t;

#endif /* included_vlib_node_h */

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