summaryrefslogtreecommitdiffstats
path: root/src/vlibmemory/memory_shared.c
blob: 021c54ef95397bbbe10b1baaf6a152c60d8a6618 (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
/*
 *------------------------------------------------------------------
 * memclnt_shared.c - API message handling, common code for both clients
 * and the vlib process itself.
 *
 *
 * Copyright (c) 2009 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.
 *------------------------------------------------------------------
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <vppinfra/format.h>
#include <vppinfra/byte_order.h>
#include <vppinfra/error.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlibmemory/api.h>
#include <vlibmemory/unix_shared_memory_queue.h>

#include <vlibmemory/vl_memory_msg_enum.h>

#define vl_typedefs
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_typedefs

socket_main_t socket_main;

#define DEBUG_MESSAGE_BUFFER_OVERRUN 0

static inline void *
vl_msg_api_alloc_internal (int nbytes, int pool, int may_return_null)
{
  int i;
  msgbuf_t *rv;
  ring_alloc_t *ap;
  unix_shared_memory_queue_t *q;
  void *oldheap;
  vl_shmem_hdr_t *shmem_hdr;
  api_main_t *am = &api_main;

  shmem_hdr = am->shmem_hdr;

#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
  nbytes += 4;
#endif

  if (shmem_hdr == 0)
    {
      clib_warning ("shared memory header NULL");
      return 0;
    }

  /* account for the msgbuf_t header */
  nbytes += sizeof (msgbuf_t);

  if (shmem_hdr->vl_rings == 0)
    {
      clib_warning ("vl_rings NULL");
      ASSERT (0);
      abort ();
    }

  if (shmem_hdr->client_rings == 0)
    {
      clib_warning ("client_rings NULL");
      ASSERT (0);
      abort ();
    }

  ap = pool ? shmem_hdr->vl_rings : shmem_hdr->client_rings;
  for (i = 0; i < vec_len (ap); i++)
    {
      /* Too big? */
      if (nbytes > ap[i].size)
	{
	  continue;
	}

      q = ap[i].rp;
      if (pool == 0)
	{
	  pthread_mutex_lock (&q->mutex);
	}
      rv = (msgbuf_t *) (&q->data[0] + q->head * q->elsize);
      /*
       * Is this item still in use?
       */
      if (rv->q)
	{
	  u32 now = (u32) time (0);

	  if (PREDICT_TRUE (rv->gc_mark_timestamp == 0))
	    rv->gc_mark_timestamp = now;
	  else
	    {
	      if (now - rv->gc_mark_timestamp > 10)
		{
		  if (CLIB_DEBUG > 0)
		    {
		      u16 *msg_idp, msg_id;
		      clib_warning
			("garbage collect pool %d ring %d index %d", pool, i,
			 q->head);
		      msg_idp = (u16 *) (rv->data);
		      msg_id = clib_net_to_host_u16 (*msg_idp);
		      if (msg_id < vec_len (api_main.msg_names))
			clib_warning ("msg id %d name %s", (u32) msg_id,
				      api_main.msg_names[msg_id]);
		    }
		  shmem_hdr->garbage_collects++;
		  goto collected;
		}
	    }


	  /* yes, loser; try next larger pool */
	  ap[i].misses++;
	  if (pool == 0)
	    pthread_mutex_unlock (&q->mutex);
	  continue;
	}
    collected:

      /* OK, we have a winner */
      ap[i].hits++;
      /*
       * Remember the source queue, although we
       * don't need to know the queue to free the item.
       */
      rv->q = q;
      rv->gc_mark_timestamp = 0;
      q->head++;
      if (q->head == q->maxsize)
	q->head = 0;

      if (pool == 0)
	pthread_mutex_unlock (&q->mutex);
      goto out;
    }

  /*
   * Request too big, or head element of all size-compatible rings
   * still in use. Fall back to shared-memory malloc.
   */
  am->ring_misses++;

  pthread_mutex_lock (&am->vlib_rp->mutex);
  oldheap = svm_push_data_heap (am->vlib_rp);
  if (may_return_null)
    {
      rv = clib_mem_alloc_or_null (nbytes);
      if (PREDICT_FALSE (rv == 0))
	{
	  svm_pop_heap (oldheap);
	  pthread_mutex_unlock (&am->vlib_rp->mutex);
	  return 0;
	}
    }
  else
    rv = clib_mem_alloc (nbytes);

  rv->q = 0;
  svm_pop_heap (oldheap);
  pthread_mutex_unlock (&am->vlib_rp->mutex);

out:
#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
  {
    nbytes -= 4;
    u32 *overrun;
    overrun = (u32 *) (rv->data + nbytes - sizeof (msgbuf_t));
    *overrun = 0x1badbabe;
  }
#endif
  rv->data_len = htonl (nbytes - sizeof (msgbuf_t));

  return (rv->data);
}

void *
vl_msg_api_alloc (int nbytes)
{
  int pool;
  api_main_t *am = &api_main;
  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;

  /*
   * Clients use pool-0, vlib proc uses pool 1
   */
  pool = (am->our_pid == shmem_hdr->vl_pid);
  return vl_msg_api_alloc_internal (nbytes, pool, 0 /* may_return_null */ );
}

void *
vl_msg_api_alloc_or_null (int nbytes)
{
  int pool;
  api_main_t *am = &api_main;
  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;

  pool = (am->our_pid == shmem_hdr->vl_pid);
  return vl_msg_api_alloc_internal (nbytes, pool, 1 /* may_return_null */ );
}

void *
vl_msg_api_alloc_as_if_client (int nbytes)
{
  return vl_msg_api_alloc_internal (nbytes, 0, 0 /* may_return_null */ );
}

void *
vl_msg_api_alloc_as_if_client_or_null (int nbytes)
{
  return vl_msg_api_alloc_internal (nbytes, 0, 1 /* may_return_null */ );
}

void
vl_msg_api_free (void *a)
{
  msgbuf_t *rv;
  void *oldheap;
  api_main_t *am = &api_main;

  rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data));

  /*
   * Here's the beauty of the scheme.  Only one proc/thread has
   * control of a given message buffer. To free a buffer, we just clear the
   * queue field, and leave. No locks, no hits, no errors...
   */
  if (rv->q)
    {
      rv->q = 0;
      rv->gc_mark_timestamp = 0;
#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
      {
	u32 *overrun;
	overrun = (u32 *) (rv->data + ntohl (rv->data_len));
	ASSERT (*overrun == 0x1badbabe);
      }
#endif
      return;
    }

  pthread_mutex_lock (&am->vlib_rp->mutex);
  oldheap = svm_push_data_heap (am->vlib_rp);

#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
  {
    u32 *overrun;
    overrun = (u32 *) (rv->data + ntohl (rv->data_len));
    ASSERT (*overrun == 0x1badbabe);
  }
#endif

  clib_mem_free (rv);
  svm_pop_heap (oldheap);
  pthread_mutex_unlock (&am->vlib_rp->mutex);
}

static void
vl_msg_api_free_nolock (void *a)
{
  msgbuf_t *rv;
  void *oldheap;
  api_main_t *am = &api_main;

  rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data));
  /*
   * Here's the beauty of the scheme.  Only one proc/thread has
   * control of a given message buffer. To free a buffer, we just clear the
   * queue field, and leave. No locks, no hits, no errors...
   */
  if (rv->q)
    {
      rv->q = 0;
      return;
    }

  oldheap = svm_push_data_heap (am->vlib_rp);
  clib_mem_free (rv);
  svm_pop_heap (oldheap);
}

void
vl_set_memory_root_path (const char *name)
{
  api_main_t *am = &api_main;

  am->root_path = name;
}

void
vl_set_memory_uid (int uid)
{
  api_main_t *am = &api_main;

  am->api_uid = uid;
}

void
vl_set_memory_gid (int gid)
{
  api_main_t *am = &api_main;

  am->api_gid = gid;
}

void
vl_set_global_memory_baseva (u64 baseva)
{
  api_main_t *am = &api_main;

  am->global_baseva = baseva;
}

void
vl_set_global_memory_size (u64 size)
{
  api_main_t *am = &api_main;

  am->global_size = size;
}

void
vl_set_api_memory_size (u64 size)
{
  api_main_t *am = &api_main;

  am->api_size = size;
}

void
vl_set_global_pvt_heap_size (u64 size)
{
  api_main_t *am = &api_main;

  am->global_pvt_heap_size = size;
}

void
vl_set_api_pvt_heap_size (u64 size)
{
  api_main_t *am = &api_main;

  am->api_pvt_heap_size = size;
}

void
vl_init_shmem (svm_region_t * vlib_rp, int is_vlib, int is_private_region)
{
  api_main_t *am = &api_main;
  vl_shmem_hdr_t *shmem_hdr = 0;
  u32 vlib_input_queue_length;
  void *oldheap;
  ASSERT (vlib_rp);

  /* $$$$ need private region config parameters */

  oldheap = svm_push_data_heap (vlib_rp);

  vec_validate (shmem_hdr, 0);
  shmem_hdr->version = VL_SHM_VERSION;

  /* vlib main input queue */
  vlib_input_queue_length = 1024;
  if (am->vlib_input_queue_length)
    vlib_input_queue_length = am->vlib_input_queue_length;

  shmem_hdr->vl_input_queue =
    unix_shared_memory_queue_init (vlib_input_queue_length, sizeof (uword),
				   getpid (), am->vlib_signal);

  /* Set up the msg ring allocator */
#define _(sz,n)                                                 \
    do {                                                        \
        ring_alloc_t _rp;                                       \
        _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
        _rp.size = (sz);                                        \
        _rp.nitems = n;                                         \
        _rp.hits = 0;                                           \
        _rp.misses = 0;                                         \
        vec_add1(shmem_hdr->vl_rings, _rp);                     \
    } while (0);

  foreach_vl_aring_size;
#undef _

#define _(sz,n)                                                 \
    do {                                                        \
        ring_alloc_t _rp;                                       \
        _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
        _rp.size = (sz);                                        \
        _rp.nitems = n;                                         \
        _rp.hits = 0;                                           \
        _rp.misses = 0;                                         \
        vec_add1(shmem_hdr->client_rings, _rp);                 \
    } while (0);

  foreach_clnt_aring_size;
#undef _

  if (is_private_region == 0)
    {
      am->shmem_hdr = shmem_hdr;
      am->vlib_rp = vlib_rp;
      am->our_pid = getpid ();
      if (is_vlib)
	am->shmem_hdr->vl_pid = am->our_pid;
    }
  else
    shmem_hdr->vl_pid = am->our_pid;

  svm_pop_heap (oldheap);

  /*
   * After absolutely everything that a client might see is set up,
   * declare the shmem region valid
   */
  vlib_rp->user_ctx = shmem_hdr;

  pthread_mutex_unlock (&vlib_rp->mutex);
}


int
vl_map_shmem (const char *region_name, int is_vlib)
{
  svm_map_region_args_t _a, *a = &_a;
  svm_region_t *vlib_rp, *root_rp;
  api_main_t *am = &api_main;
  int i, rv;
  struct timespec ts, tsrem;
  char *vpe_api_region_suffix = "-vpe-api";

  memset (a, 0, sizeof (*a));

  if (strstr (region_name, vpe_api_region_suffix))
    {
      u8 *root_path = format (0, "%s", region_name);
      _vec_len (root_path) = (vec_len (root_path) -
			      strlen (vpe_api_region_suffix));
      vec_terminate_c_string (root_path);
      a->root_path = (const char *) root_path;
      am->root_path = (const char *) root_path;
    }

  if (is_vlib == 0)
    {
      rv = svm_region_init_chroot (am->root_path);
      if (rv)
	return rv;
    }

  if (a->root_path != NULL)
    {
      a->name = "/vpe-api";
    }
  else
    a->name = region_name;
  a->size = am->api_size ? am->api_size : (16 << 20);
  a->flags = SVM_FLAGS_MHEAP;
  a->uid = am->api_uid;
  a->gid = am->api_gid;
  a->pvt_heap_size = am->api_pvt_heap_size;

  vlib_rp = svm_region_find_or_create (a);

  if (vlib_rp == 0)
    return (-2);

  pthread_mutex_lock (&vlib_rp->mutex);
  /* Has someone else set up the shared-memory variable table? */
  if (vlib_rp->user_ctx)
    {
      am->shmem_hdr = (void *) vlib_rp->user_ctx;
      am->our_pid = getpid ();
      if (is_vlib)
	{
	  unix_shared_memory_queue_t *q;
	  uword old_msg;
	  /*
	   * application restart. Reset cached pids, API message
	   * rings, list of clients; otherwise, various things
	   * fail. (e.g. queue non-empty notification)
	   */

	  /* ghosts keep the region from disappearing properly */
	  svm_client_scan_this_region_nolock (vlib_rp);
	  am->shmem_hdr->application_restarts++;
	  q = am->shmem_hdr->vl_input_queue;
	  am->shmem_hdr->vl_pid = getpid ();
	  q->consumer_pid = am->shmem_hdr->vl_pid;
	  /* Drain the input queue, freeing msgs */
	  for (i = 0; i < 10; i++)
	    {
	      if (pthread_mutex_trylock (&q->mutex) == 0)
		{
		  pthread_mutex_unlock (&q->mutex);
		  goto mutex_ok;
		}
	      ts.tv_sec = 0;
	      ts.tv_nsec = 10000 * 1000;	/* 10 ms */
	      while (nanosleep (&ts, &tsrem) < 0)
		ts = tsrem;
	    }
	  /* Mutex buggered, "fix" it */
	  memset (&q->mutex, 0, sizeof (q->mutex));
	  clib_warning ("forcibly release main input queue mutex");

	mutex_ok:
	  am->vlib_rp = vlib_rp;
	  while (unix_shared_memory_queue_sub (q,
					       (u8 *) & old_msg,
					       1 /* nowait */ )
		 != -2 /* queue underflow */ )
	    {
	      vl_msg_api_free_nolock ((void *) old_msg);
	      am->shmem_hdr->restart_reclaims++;
	    }
	  pthread_mutex_unlock (&vlib_rp->mutex);
	  root_rp = svm_get_root_rp ();
	  ASSERT (root_rp);
	  /* Clean up the root region client list */
	  pthread_mutex_lock (&root_rp->mutex);
	  svm_client_scan_this_region_nolock (root_rp);
	  pthread_mutex_unlock (&root_rp->mutex);
	}
      else
	{
	  pthread_mutex_unlock (&vlib_rp->mutex);
	}
      am->vlib_rp = vlib_rp;
      vec_add1 (am->mapped_shmem_regions, vlib_rp);
      return 0;
    }
  /* Clients simply have to wait... */
  if (!is_vlib)
    {
      pthread_mutex_unlock (&vlib_rp->mutex);

      /* Wait up to 100 seconds... */
      for (i = 0; i < 10000; i++)
	{
	  ts.tv_sec = 0;
	  ts.tv_nsec = 10000 * 1000;	/* 10 ms */
	  while (nanosleep (&ts, &tsrem) < 0)
	    ts = tsrem;
	  if (vlib_rp->user_ctx)
	    goto ready;
	}
      /* Clean up and leave... */
      svm_region_unmap (vlib_rp);
      clib_warning ("region init fail");
      return (-2);

    ready:
      am->shmem_hdr = (void *) vlib_rp->user_ctx;
      am->our_pid = getpid ();
      am->vlib_rp = vlib_rp;
      vec_add1 (am->mapped_shmem_regions, vlib_rp);
      return 0;
    }

  /* Nope, it's our problem... */
  vl_init_shmem (vlib_rp, 1 /* is vlib */ , 0 /* is_private_region */ );

  vec_add1 (am->mapped_shmem_regions, vlib_rp);
  return 0;
}

void
vl_register_mapped_shmem_region (svm_region_t * rp)
{
  api_main_t *am = &api_main;

  vec_add1 (am->mapped_shmem_regions, rp);
}

void
vl_unmap_shmem (void)
{
  svm_region_t *rp;
  int i;
  api_main_t *am = &api_main;

  if (!svm_get_root_rp ())
    return;

  for (i = 0; i < vec_len (am->mapped_shmem_regions); i++)
    {
      rp = am->mapped_shmem_regions[i];
      svm_region_unmap (rp);
    }

  vec_free (am->mapped_shmem_regions);
  am->shmem_hdr = 0;

  svm_region_exit ();
  /* $$$ more careful cleanup, valgrind run... */
  vec_free (am->msg_handlers);
  vec_free (am->msg_endian_handlers);
  vec_free (am->msg_print_handlers);
}

void
vl_msg_api_send_shmem (unix_shared_memory_queue_t * q, u8 * elem)
{
  api_main_t *am = &api_main;
  uword *trace = (uword *) elem;

  if (am->tx_trace && am->tx_trace->enabled)
    vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]);

  (void) unix_shared_memory_queue_add (q, elem, 0 /* nowait */ );
}

void
vl_msg_api_send_shmem_nolock (unix_shared_memory_queue_t * q, u8 * elem)
{
  api_main_t *am = &api_main;
  uword *trace = (uword *) elem;

  if (am->tx_trace && am->tx_trace->enabled)
    vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]);

  (void) unix_shared_memory_queue_add_nolock (q, elem);
}

u32
vl_api_get_msg_index (u8 * name_and_crc)
{
  api_main_t *am = &api_main;
  uword *p;

  if (am->msg_index_by_name_and_crc)
    {
      p = hash_get_mem (am->msg_index_by_name_and_crc, name_and_crc);
      if (p)
	return p[0];
    }
  return ~0;
}

static inline vl_api_registration_t *
vl_api_client_index_to_registration_internal (u32 handle)
{
  vl_api_registration_t **regpp;
  vl_api_registration_t *regp;
  api_main_t *am = &api_main;
  u32 index;

  index = vl_msg_api_handle_get_index (handle);
  if ((am->shmem_hdr->application_restarts & VL_API_EPOCH_MASK)
      != vl_msg_api_handle_get_epoch (handle))
    {
      vl_msg_api_increment_missing_client_counter ();
      return 0;
    }

  regpp = am->vl_clients + index;

  if (pool_is_free (am->vl_clients, regpp))
    {
      vl_msg_api_increment_missing_client_counter ();
      return 0;
    }
  regp = *regpp;
  return (regp);
}

vl_api_registration_t *
vl_api_client_index_to_registration (u32 index)
{
  if (PREDICT_FALSE (socket_main.current_rp != 0))
    return socket_main.current_rp;

  return (vl_api_client_index_to_registration_internal (index));
}

unix_shared_memory_queue_t *
vl_api_client_index_to_input_queue (u32 index)
{
  vl_api_registration_t *regp;
  api_main_t *am = &api_main;

  /* Special case: vlib trying to send itself a message */
  if (index == (u32) ~ 0)
    return (am->shmem_hdr->vl_input_queue);

  regp = vl_api_client_index_to_registration_internal (index);
  if (!regp)
    return 0;
  return (regp->vl_input_queue);
}

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