aboutsummaryrefslogtreecommitdiffstats
path: root/src/vcl/vcl_private.c
blob: 95a45ffd0990be91d04261c29d05639250c7cf9d (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
/*
 * Copyright (c) 2018-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this
 * 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 <vcl/vcl_private.h>

static pthread_key_t vcl_worker_stop_key;

vcl_mq_evt_conn_t *
vcl_mq_evt_conn_alloc (vcl_worker_t * wrk)
{
  vcl_mq_evt_conn_t *mqc;
  pool_get (wrk->mq_evt_conns, mqc);
  memset (mqc, 0, sizeof (*mqc));
  return mqc;
}

u32
vcl_mq_evt_conn_index (vcl_worker_t * wrk, vcl_mq_evt_conn_t * mqc)
{
  return (mqc - wrk->mq_evt_conns);
}

vcl_mq_evt_conn_t *
vcl_mq_evt_conn_get (vcl_worker_t * wrk, u32 mq_conn_idx)
{
  return pool_elt_at_index (wrk->mq_evt_conns, mq_conn_idx);
}

int
vcl_mq_epoll_add_evfd (vcl_worker_t * wrk, svm_msg_q_t * mq)
{
  struct epoll_event e = { 0 };
  vcl_mq_evt_conn_t *mqc;
  u32 mqc_index;
  int mq_fd;

  mq_fd = svm_msg_q_get_eventfd (mq);

  if (wrk->mqs_epfd < 0 || mq_fd == -1)
    return -1;

  mqc = vcl_mq_evt_conn_alloc (wrk);
  mqc_index = vcl_mq_evt_conn_index (wrk, mqc);
  mqc->mq_fd = mq_fd;
  mqc->mq = mq;

  e.events = EPOLLIN;
  e.data.u32 = mqc_index;
  if (epoll_ctl (wrk->mqs_epfd, EPOLL_CTL_ADD, mq_fd, &e) < 0)
    {
      VDBG (0, "failed to add mq eventfd to mq epoll fd");
      return -1;
    }

  return mqc_index;
}

int
vcl_mq_epoll_del_evfd (vcl_worker_t * wrk, u32 mqc_index)
{
  vcl_mq_evt_conn_t *mqc;

  if (wrk->mqs_epfd || mqc_index == ~0)
    return -1;

  mqc = vcl_mq_evt_conn_get (wrk, mqc_index);
  if (epoll_ctl (wrk->mqs_epfd, EPOLL_CTL_DEL, mqc->mq_fd, 0) < 0)
    {
      VDBG (0, "failed to del mq eventfd to mq epoll fd");
      return -1;
    }
  return 0;
}

static vcl_worker_t *
vcl_worker_alloc (void)
{
  vcl_worker_t *wrk;
  pool_get (vcm->workers, wrk);
  memset (wrk, 0, sizeof (*wrk));
  wrk->wrk_index = wrk - vcm->workers;
  wrk->forked_child = ~0;
  return wrk;
}

static void
vcl_worker_free (vcl_worker_t * wrk)
{
  pool_put (vcm->workers, wrk);
}

int
vcl_api_app_worker_add (void)
{
  if (vcm->cfg.vpp_app_socket_api)
    return vcl_sapi_app_worker_add ();

  return vcl_bapi_app_worker_add ();
}

void
vcl_api_app_worker_del (vcl_worker_t * wrk)
{
  if (vcm->cfg.vpp_app_socket_api)
    return vcl_sapi_app_worker_del (wrk);

  vcl_bapi_app_worker_del (wrk);
}

void
vcl_worker_cleanup (vcl_worker_t * wrk, u8 notify_vpp)
{
  clib_spinlock_lock (&vcm->workers_lock);
  if (notify_vpp)
    vcl_api_app_worker_del (wrk);

  if (wrk->mqs_epfd > 0)
    close (wrk->mqs_epfd);
  pool_free (wrk->sessions);
  pool_free (wrk->mq_evt_conns);
  hash_free (wrk->session_index_by_vpp_handles);
  vec_free (wrk->mq_events);
  vec_free (wrk->mq_msg_vector);
  vec_free (wrk->ep_level_evts);
  vec_free (wrk->ep_level_evts_fl);
  vec_free (wrk->unhandled_evts_vector);
  vec_free (wrk->pending_session_wrk_updates);
  clib_bitmap_free (wrk->rd_bitmap);
  clib_bitmap_free (wrk->wr_bitmap);
  clib_bitmap_free (wrk->ex_bitmap);
  vcl_worker_free (wrk);
  clib_spinlock_unlock (&vcm->workers_lock);
}

static void
vcl_worker_cleanup_cb (void *arg)
{
  vcl_worker_t *wrk;
  u32 wrk_index;

  wrk_index = vcl_get_worker_index ();
  wrk = vcl_worker_get_if_valid (wrk_index);
  if (!wrk)
    return;

  vcl_worker_cleanup (wrk, 1 /* notify vpp */ );
  vcl_set_worker_index (~0);
  VDBG (0, "cleaned up worker %u", wrk_index);
}

vcl_worker_t *
vcl_worker_alloc_and_init ()
{
  vcl_worker_t *wrk;

  /* This was initialized already */
  if (vcl_get_worker_index () != ~0)
    return 0;

  /* Use separate heap map entry for worker */
  clib_mem_set_thread_index ();

  if (pool_elts (vcm->workers) == vcm->cfg.max_workers)
    {
      VDBG (0, "max-workers %u limit reached", vcm->cfg.max_workers);
      return 0;
    }

  clib_spinlock_lock (&vcm->workers_lock);
  wrk = vcl_worker_alloc ();
  vcl_set_worker_index (wrk->wrk_index);
  wrk->thread_id = pthread_self ();
  wrk->current_pid = getpid ();

  wrk->mqs_epfd = -1;
  if (vcm->cfg.use_mq_eventfd)
    {
      wrk->vcl_needs_real_epoll = 1;
      wrk->mqs_epfd = epoll_create (1);
      wrk->vcl_needs_real_epoll = 0;
      if (wrk->mqs_epfd < 0)
	{
	  clib_unix_warning ("epoll_create() returned");
	  goto done;
	}
    }

  wrk->session_index_by_vpp_handles = hash_create (0, sizeof (uword));
  clib_time_init (&wrk->clib_time);
  vec_validate (wrk->mq_events, 64);
  vec_validate (wrk->mq_msg_vector, 128);
  vec_reset_length (wrk->mq_msg_vector);
  vec_validate (wrk->unhandled_evts_vector, 128);
  vec_reset_length (wrk->unhandled_evts_vector);
  clib_spinlock_unlock (&vcm->workers_lock);

done:
  return wrk;
}

int
vcl_worker_register_with_vpp (void)
{
  vcl_worker_t *wrk = vcl_worker_get_current ();

  clib_spinlock_lock (&vcm->workers_lock);

  if (vcl_api_app_worker_add ())
    {
      VDBG (0, "failed to add worker to vpp");
      clib_spinlock_unlock (&vcm->workers_lock);
      return -1;
    }
  if (pthread_key_create (&vcl_worker_stop_key, vcl_worker_cleanup_cb))
    VDBG (0, "failed to add pthread cleanup function");
  if (pthread_setspecific (vcl_worker_stop_key, &wrk->thread_id))
    VDBG (0, "failed to setup key value");

  clib_spinlock_unlock (&vcm->workers_lock);

  VDBG (0, "added worker %u", wrk->wrk_index);
  return 0;
}

svm_msg_q_t *
vcl_worker_ctrl_mq (vcl_worker_t * wrk)
{
  return wrk->ctrl_mq;
}

int
vcl_session_read_ready (vcl_session_t * s)
{
  if (PREDICT_FALSE (s->flags & VCL_SESSION_F_IS_VEP))
    {
      VDBG (0, "ERROR: session %u: cannot read from an epoll session!",
	    s->session_index);
      return VPPCOM_EBADFD;
    }

  if (vcl_session_is_open (s))
    {
      if (vcl_session_is_ct (s))
	return svm_fifo_max_dequeue_cons (s->ct_rx_fifo);

      if (s->is_dgram)
	{
	  session_dgram_pre_hdr_t ph;
	  u32 max_deq;

	  max_deq = svm_fifo_max_dequeue_cons (s->rx_fifo);
	  if (max_deq <= SESSION_CONN_HDR_LEN)
	    return 0;
	  if (svm_fifo_peek (s->rx_fifo, 0, sizeof (ph), (u8 *) & ph) < 0)
	    return 0;
	  if (ph.data_length + SESSION_CONN_HDR_LEN > max_deq)
	    return 0;

	  return ph.data_length;
	}

      return svm_fifo_max_dequeue_cons (s->rx_fifo);
    }
  else if (s->session_state == VCL_STATE_LISTEN)
    {
      return clib_fifo_elts (s->accept_evts_fifo);
    }
  else
    {
      return (s->session_state == VCL_STATE_DISCONNECT) ?
	VPPCOM_ECONNRESET : VPPCOM_ENOTCONN;
    }
}

int
vcl_session_write_ready (vcl_session_t * s)
{
  if (PREDICT_FALSE (s->flags & VCL_SESSION_F_IS_VEP))
    {
      VDBG (0, "session %u [0x%llx]: cannot write to an epoll session!",
	    s->session_index, s->vpp_handle);
      return VPPCOM_EBADFD;
    }

  if (vcl_session_is_open (s))
    {
      if (vcl_session_is_ct (s))
	return svm_fifo_max_enqueue_prod (s->ct_tx_fifo);

      if (s->is_dgram)
	{
	  u32 max_enq = svm_fifo_max_enqueue_prod (s->tx_fifo);

	  if (max_enq <= sizeof (session_dgram_hdr_t))
	    return 0;
	  return max_enq - sizeof (session_dgram_hdr_t);
	}

      return svm_fifo_max_enqueue_prod (s->tx_fifo);
    }
  else if (s->session_state == VCL_STATE_LISTEN)
    {
      if (s->tx_fifo)
	return svm_fifo_max_enqueue_prod (s->tx_fifo);
      else
	return VPPCOM_EBADFD;
    }
  else
    {
      return (s->session_state == VCL_STATE_DISCONNECT) ?
	VPPCOM_ECONNRESET : VPPCOM_ENOTCONN;
    }
}

int
vcl_session_alloc_ext_cfg (vcl_session_t *s,
			   transport_endpt_ext_cfg_type_t type, u32 len)
{
  if (s->ext_config)
    return -1;

  s->ext_config = clib_mem_alloc (len);
  clib_memset (s->ext_config, 0, len);
  s->ext_config->len = len;
  s->ext_config->type = type;

  return 0;
}

int
vcl_segment_attach (u64 segment_handle, char *name, ssvm_segment_type_t type,
		    int fd)
{
  fifo_segment_create_args_t _a, *a = &_a;
  int rv;

  memset (a, 0, sizeof (*a));
  a->segment_name = name;
  a->segment_type = type;

  if (type == SSVM_SEGMENT_MEMFD)
    a->memfd_fd = fd;

  clib_rwlock_writer_lock (&vcm->segment_table_lock);

  if ((rv = fifo_segment_attach (&vcm->segment_main, a)))
    {
      clib_warning ("svm_fifo_segment_attach ('%s') failed", name);
      return rv;
    }
  hash_set (vcm->segment_table, segment_handle, a->new_segment_indices[0]);

  clib_rwlock_writer_unlock (&vcm->segment_table_lock);

  vec_free (a->new_segment_indices);
  return 0;
}

u32
vcl_segment_table_lookup (u64 segment_handle)
{
  uword *seg_indexp;

  clib_rwlock_reader_lock (&vcm->segment_table_lock);
  seg_indexp = hash_get (vcm->segment_table, segment_handle);
  clib_rwlock_reader_unlock (&vcm->segment_table_lock);

  if (!seg_indexp)
    return VCL_INVALID_SEGMENT_INDEX;
  return ((u32) * seg_indexp);
}

void
vcl_segment_detach (u64 segment_handle)
{
  fifo_segment_main_t *sm = &vcm->segment_main;
  fifo_segment_t *segment;
  u32 segment_index;

  segment_index = vcl_segment_table_lookup (segment_handle);
  if (segment_index == (u32) ~ 0)
    return;

  clib_rwlock_writer_lock (&vcm->segment_table_lock);

  segment = fifo_segment_get_segment (sm, segment_index);
  fifo_segment_delete (sm, segment);
  hash_unset (vcm->segment_table, segment_handle);

  clib_rwlock_writer_unlock (&vcm->segment_table_lock);

  VDBG (0, "detached segment %u handle %u", segment_index, segment_handle);
}

int
vcl_segment_attach_session (uword segment_handle, uword rxf_offset,
			    uword txf_offset, uword mq_offset, u8 is_ct,
			    vcl_session_t *s)
{
  u32 fs_index, eqs_index;
  svm_fifo_t *rxf, *txf;
  fifo_segment_t *fs;
  u64 eqs_handle;

  fs_index = vcl_segment_table_lookup (segment_handle);
  if (fs_index == VCL_INVALID_SEGMENT_INDEX)
    {
      VDBG (0, "ERROR: segment for session %u is not mounted!",
	    s->session_index);
      return -1;
    }

  if (!is_ct && mq_offset != (uword) ~0)
    {
      eqs_handle = vcl_vpp_worker_segment_handle (0);
      eqs_index = vcl_segment_table_lookup (eqs_handle);
      ASSERT (eqs_index != VCL_INVALID_SEGMENT_INDEX);
    }

  clib_rwlock_reader_lock (&vcm->segment_table_lock);

  fs = fifo_segment_get_segment (&vcm->segment_main, fs_index);
  rxf = fifo_segment_alloc_fifo_w_offset (fs, rxf_offset);
  txf = fifo_segment_alloc_fifo_w_offset (fs, txf_offset);
  rxf->segment_index = fs_index;
  txf->segment_index = fs_index;

  if (!is_ct && mq_offset != (uword) ~0)
    {
      fs = fifo_segment_get_segment (&vcm->segment_main, eqs_index);
      s->vpp_evt_q =
	fifo_segment_msg_q_attach (fs, mq_offset, rxf->shr->slice_index);
    }

  clib_rwlock_reader_unlock (&vcm->segment_table_lock);

  if (!is_ct)
    {
      rxf->shr->client_session_index = s->session_index;
      txf->shr->client_session_index = s->session_index;
      rxf->client_thread_index = vcl_get_worker_index ();
      txf->client_thread_index = vcl_get_worker_index ();
      s->rx_fifo = rxf;
      s->tx_fifo = txf;
    }
  else
    {
      s->ct_rx_fifo = rxf;
      s->ct_tx_fifo = txf;
    }

  return 0;
}

void
vcl_session_detach_fifos (vcl_session_t *s)
{
  fifo_segment_t *fs;

  if (!s->rx_fifo)
    return;

  clib_rwlock_reader_lock (&vcm->segment_table_lock);

  fs = fifo_segment_get_segment_if_valid (&vcm->segment_main,
					  s->rx_fifo->segment_index);
  if (!fs)
    goto done;

  fifo_segment_free_client_fifo (fs, s->rx_fifo);
  fifo_segment_free_client_fifo (fs, s->tx_fifo);
  if (s->ct_rx_fifo)
    {
      fs = fifo_segment_get_segment_if_valid (&vcm->segment_main,
					      s->ct_rx_fifo->segment_index);
      if (!fs)
	goto done;

      fifo_segment_free_client_fifo (fs, s->ct_rx_fifo);
      fifo_segment_free_client_fifo (fs, s->ct_tx_fifo);
    }

done:
  clib_rwlock_reader_unlock (&vcm->segment_table_lock);
}

int
vcl_segment_attach_mq (uword segment_handle, uword mq_offset, u32 mq_index,
		       svm_msg_q_t **mq)
{
  fifo_segment_t *fs;
  u32 fs_index;

  fs_index = vcl_segment_table_lookup (segment_handle);
  if (fs_index == VCL_INVALID_SEGMENT_INDEX)
    {
      VDBG (0, "ERROR: mq segment %lx for is not attached!", segment_handle);
      return -1;
    }

  clib_rwlock_reader_lock (&vcm->segment_table_lock);

  fs = fifo_segment_get_segment (&vcm->segment_main, fs_index);
  *mq = fifo_segment_msg_q_attach (fs, mq_offset, mq_index);

  clib_rwlock_reader_unlock (&vcm->segment_table_lock);

  return 0;
}

int
vcl_segment_discover_mqs (uword segment_handle, int *fds, u32 n_fds)
{
  fifo_segment_t *fs;
  u32 fs_index;

  fs_index = vcl_segment_table_lookup (segment_handle);
  if (fs_index == VCL_INVALID_SEGMENT_INDEX)
    {
      VDBG (0, "ERROR: mq segment %lx for is not attached!", segment_handle);
      return -1;
    }

  clib_rwlock_reader_lock (&vcm->segment_table_lock);

  fs = fifo_segment_get_segment (&vcm->segment_main, fs_index);
  fifo_segment_msg_qs_discover (fs, fds, n_fds);

  clib_rwlock_reader_unlock (&vcm->segment_table_lock);

  return 0;
}

svm_fifo_chunk_t *
vcl_segment_alloc_chunk (uword segment_handle, u32 slice_index, u32 size,
			 uword *offset)
{
  svm_fifo_chunk_t *c;
  fifo_segment_t *fs;
  u32 fs_index;

  fs_index = vcl_segment_table_lookup (segment_handle);
  if (fs_index == VCL_INVALID_SEGMENT_INDEX)
    {
      VDBG (0, "ERROR: mq segment %lx for is not attached!", segment_handle);
      return 0;
    }

  clib_rwlock_reader_lock (&vcm->segment_table_lock);

  fs = fifo_segment_get_segment (&vcm->segment_main, fs_index);
  c = fifo_segment_alloc_chunk_w_slice (fs, slice_index, size);
  *offset = fifo_segment_chunk_offset (fs, c);

  clib_rwlock_reader_unlock (&vcm->segment_table_lock);

  return c;
}

int
vcl_session_share_fifos (vcl_session_t *s, svm_fifo_t *rxf, svm_fifo_t *txf)
{
  vcl_worker_t *wrk = vcl_worker_get_current ();
  fifo_segment_t *fs;

  clib_rwlock_reader_lock (&vcm->segment_table_lock);

  fs = fifo_segment_get_segment (&vcm->segment_main, rxf->segment_index);
  s->rx_fifo = fifo_segment_duplicate_fifo (fs, rxf);
  s->tx_fifo = fifo_segment_duplicate_fifo (fs, txf);

  clib_rwlock_reader_unlock (&vcm->segment_table_lock);

  svm_fifo_add_subscriber (s->rx_fifo, wrk->vpp_wrk_index);
  svm_fifo_add_subscriber (s->tx_fifo, wrk->vpp_wrk_index);

  return 0;
}

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