aboutsummaryrefslogtreecommitdiffstats
path: root/src/vlibmemory/memory_client.c
blob: 3e1bdff777cd5572f726ee2ebbac8ab225590b78 (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
/*
 *------------------------------------------------------------------
 * memory_client.c - API message handling, client code.
 *
 * Copyright (c) 2010 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 <setjmp.h>

#include <svm/svm.h>
#include <svm/ssvm.h>
#include <vppinfra/serialize.h>
#include <vppinfra/hash.h>
#include <vlibmemory/memory_client.h>

/* A hack. vl_client_get_first_plugin_msg_id depends on it */
#include <vlibmemory/socket_client.h>

#include <vlibmemory/vl_memory_msg_enum.h>

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

#define vl_endianfun		/* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_endianfun

/* instantiate all the print functions we know about */
#define vl_print(handle, ...) clib_warning (__VA_ARGS__)
#define vl_printfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_printfun

typedef struct
{
  u8 rx_thread_jmpbuf_valid;
  u8 connected_to_vlib;
  jmp_buf rx_thread_jmpbuf;
  pthread_t rx_thread_handle;
  /* Plugin message base lookup scheme */
  volatile u8 first_msg_id_reply_ready;
  u16 first_msg_id_reply;
} memory_client_main_t;

memory_client_main_t memory_client_main;

static void *
rx_thread_fn (void *arg)
{
  svm_queue_t *q;
  memory_client_main_t *mm = &memory_client_main;
  api_main_t *am = &api_main;

  q = am->vl_input_queue;

  /* So we can make the rx thread terminate cleanly */
  if (setjmp (mm->rx_thread_jmpbuf) == 0)
    {
      mm->rx_thread_jmpbuf_valid = 1;
      clib_mem_set_thread_index ();
      while (1)
	vl_msg_api_queue_handler (q);
    }
  pthread_exit (0);
}

static void
vl_api_rx_thread_exit_t_handler (vl_api_rx_thread_exit_t * mp)
{
  memory_client_main_t *mm = &memory_client_main;
  if (mm->rx_thread_jmpbuf_valid)
    longjmp (mm->rx_thread_jmpbuf, 1);
}

static void
vl_api_name_and_crc_free (void)
{
  api_main_t *am = &api_main;
  int i;
  u8 **keys = 0;
  hash_pair_t *hp;

  if (!am->msg_index_by_name_and_crc)
    return;

  /* *INDENT-OFF* */
  hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
      ({
        vec_add1 (keys, (u8 *) hp->key);
      }));
  /* *INDENT-ON* */
  for (i = 0; i < vec_len (keys); i++)
    vec_free (keys[i]);
  vec_free (keys);
  hash_free (am->msg_index_by_name_and_crc);
}

static void
vl_api_memclnt_create_reply_t_handler (vl_api_memclnt_create_reply_t * mp)
{
  serialize_main_t _sm, *sm = &_sm;
  api_main_t *am = &api_main;
  u8 *tblv;
  u32 nmsgs;
  int i;
  u8 *name_and_crc;
  u32 msg_index;

  am->my_client_index = mp->index;
  am->my_registration = (vl_api_registration_t *) (uword) mp->handle;

  /* Clean out any previous hash table (unlikely) */
  vl_api_name_and_crc_free ();

  am->msg_index_by_name_and_crc = hash_create_string (0, sizeof (uword));

  /* Recreate the vnet-side API message handler table */
  tblv = uword_to_pointer (mp->message_table, u8 *);
  unserialize_open_data (sm, tblv, vec_len (tblv));
  unserialize_integer (sm, &nmsgs, sizeof (u32));

  for (i = 0; i < nmsgs; i++)
    {
      msg_index = unserialize_likely_small_unsigned_integer (sm);
      unserialize_cstring (sm, (char **) &name_and_crc);
      hash_set_mem (am->msg_index_by_name_and_crc, name_and_crc, msg_index);
    }
}

static void
noop_handler (void *notused)
{
}

void vl_msg_api_send_shmem (svm_queue_t * q, u8 * elem);
int
vl_client_connect (const char *name, int ctx_quota, int input_queue_size)
{
  svm_region_t *svm;
  vl_api_memclnt_create_t *mp;
  vl_api_memclnt_create_reply_t *rp;
  svm_queue_t *vl_input_queue;
  vl_shmem_hdr_t *shmem_hdr;
  int rv = 0;
  void *oldheap;
  api_main_t *am = &api_main;

  if (am->my_registration)
    {
      clib_warning ("client %s already connected...", name);
      return -1;
    }

  if (am->vlib_rp == 0)
    {
      clib_warning ("am->vlib_rp NULL");
      return -1;
    }

  svm = am->vlib_rp;
  shmem_hdr = am->shmem_hdr;

  if (shmem_hdr == 0 || shmem_hdr->vl_input_queue == 0)
    {
      clib_warning ("shmem_hdr / input queue NULL");
      return -1;
    }

  pthread_mutex_lock (&svm->mutex);
  oldheap = svm_push_data_heap (svm);
  vl_input_queue = svm_queue_alloc_and_init (input_queue_size, sizeof (uword),
					     getpid ());
  svm_pop_heap (oldheap);
  pthread_mutex_unlock (&svm->mutex);

  am->my_client_index = ~0;
  am->my_registration = 0;
  am->vl_input_queue = vl_input_queue;

  mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_create_t));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_CREATE);
  mp->ctx_quota = ctx_quota;
  mp->input_queue = (uword) vl_input_queue;
  vl_api_to_api_string (strnlen_s (name, 64), name, &mp->name);

  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);

  while (1)
    {
      int qstatus;
      struct timespec ts, tsrem;
      int i;

      /* Wait up to 10 seconds */
      for (i = 0; i < 1000; i++)
	{
	  qstatus = svm_queue_sub (vl_input_queue, (u8 *) & rp,
				   SVM_Q_NOWAIT, 0);
	  if (qstatus == 0)
	    goto read_one_msg;
	  ts.tv_sec = 0;
	  ts.tv_nsec = 10000 * 1000;	/* 10 ms */
	  while (nanosleep (&ts, &tsrem) < 0)
	    ts = tsrem;
	}
      /* Timeout... */
      clib_warning ("memclnt_create_reply timeout");
      return -1;

    read_one_msg:
      if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_CREATE_REPLY)
	{
	  clib_warning ("unexpected reply: id %d", ntohs (rp->_vl_msg_id));
	  continue;
	}
      rv = clib_net_to_host_u32 (rp->response);

      vl_msg_api_handler ((void *) rp);
      break;
    }
  return (rv);
}

static void
vl_api_memclnt_delete_reply_t_handler (vl_api_memclnt_delete_reply_t * mp)
{
  void *oldheap;
  api_main_t *am = &api_main;

  pthread_mutex_lock (&am->vlib_rp->mutex);
  oldheap = svm_push_data_heap (am->vlib_rp);
  svm_queue_free (am->vl_input_queue);
  pthread_mutex_unlock (&am->vlib_rp->mutex);
  svm_pop_heap (oldheap);

  am->my_client_index = ~0;
  am->my_registration = 0;
  am->vl_input_queue = 0;
}

void
vl_client_send_disconnect (u8 do_cleanup)
{
  vl_api_memclnt_delete_t *mp;
  vl_shmem_hdr_t *shmem_hdr;
  api_main_t *am = &api_main;

  ASSERT (am->vlib_rp);
  shmem_hdr = am->shmem_hdr;
  ASSERT (shmem_hdr && shmem_hdr->vl_input_queue);

  mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_delete_t));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_DELETE);
  mp->index = am->my_client_index;
  mp->handle = (uword) am->my_registration;
  mp->do_cleanup = do_cleanup;

  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
}

int
vl_client_disconnect (void)
{
  vl_api_memclnt_delete_reply_t *rp;
  svm_queue_t *vl_input_queue;
  api_main_t *am = &api_main;
  time_t begin;

  vl_input_queue = am->vl_input_queue;
  vl_client_send_disconnect (0 /* wait for reply */ );

  /*
   * Have to be careful here, in case the client is disconnecting
   * because e.g. the vlib process died, or is unresponsive.
   */
  begin = time (0);
  while (1)
    {
      time_t now;

      now = time (0);

      if (now >= (begin + 2))
	{
	  clib_warning ("peer unresponsive, give up");
	  am->my_client_index = ~0;
	  am->my_registration = 0;
	  am->shmem_hdr = 0;
	  return -1;
	}
      if (svm_queue_sub (vl_input_queue, (u8 *) & rp, SVM_Q_NOWAIT, 0) < 0)
	continue;

      /* drain the queue */
      if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_DELETE_REPLY)
	{
	  clib_warning ("queue drain: %d", ntohs (rp->_vl_msg_id));
	  vl_msg_api_handler ((void *) rp);
	  continue;
	}
      vl_msg_api_handler ((void *) rp);
      break;
    }

  vl_api_name_and_crc_free ();
  return 0;
}

/**
 * Stave off the binary API dead client reaper
 * Only sent to inactive clients
 */
static void
vl_api_memclnt_keepalive_t_handler (vl_api_memclnt_keepalive_t * mp)
{
  vl_api_memclnt_keepalive_reply_t *rmp;
  api_main_t *am;
  vl_shmem_hdr_t *shmem_hdr;

  am = &api_main;
  shmem_hdr = am->shmem_hdr;

  rmp = vl_msg_api_alloc_as_if_client (sizeof (*rmp));
  clib_memset (rmp, 0, sizeof (*rmp));
  rmp->_vl_msg_id = ntohs (VL_API_MEMCLNT_KEEPALIVE_REPLY);
  rmp->context = mp->context;
  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & rmp);
}

#define foreach_api_msg                         \
_(RX_THREAD_EXIT, rx_thread_exit)               \
_(MEMCLNT_CREATE_REPLY, memclnt_create_reply)   \
_(MEMCLNT_DELETE_REPLY, memclnt_delete_reply)	\
_(MEMCLNT_KEEPALIVE, memclnt_keepalive)

void
vl_client_install_client_message_handlers (void)
{

#define _(N,n)                                                  \
    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
                            vl_api_##n##_t_handler,             \
                            noop_handler,                       \
                            vl_api_##n##_t_endian,              \
                            vl_api_##n##_t_print,               \
                            sizeof(vl_api_##n##_t), 1);
  foreach_api_msg;
#undef _
}

int
vl_client_api_map (const char *region_name)
{
  int rv;

  if ((rv = vl_map_shmem (region_name, 0 /* is_vlib */ )) < 0)
    return rv;

  vl_client_install_client_message_handlers ();
  return 0;
}

void
vl_client_api_unmap (void)
{
  vl_unmap_shmem_client ();
}

u8
vl_mem_client_is_connected (void)
{
  return (memory_client_main.connected_to_vlib != 0);
}

static int
connect_to_vlib_internal (const char *svm_name,
			  const char *client_name,
			  int rx_queue_size, int want_pthread, int do_map)
{
  int rv = 0;
  memory_client_main_t *mm = &memory_client_main;

  if (do_map && (rv = vl_client_api_map (svm_name)))
    {
      clib_warning ("vl_client_api map rv %d", rv);
      return rv;
    }

  if (vl_client_connect (client_name, 0 /* punt quota */ ,
			 rx_queue_size /* input queue */ ) < 0)
    {
      vl_client_api_unmap ();
      return -1;
    }

  /* Start the rx queue thread */

  if (want_pthread)
    {
      rv = pthread_create (&mm->rx_thread_handle,
			   NULL /*attr */ , rx_thread_fn, 0);
      if (rv)
	clib_warning ("pthread_create returned %d", rv);
    }

  mm->connected_to_vlib = 1;
  return 0;
}

int
vl_client_connect_to_vlib (const char *svm_name,
			   const char *client_name, int rx_queue_size)
{
  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
				   1 /* want pthread */ ,
				   1 /* do map */ );
}

int
vl_client_connect_to_vlib_no_rx_pthread (const char *svm_name,
					 const char *client_name,
					 int rx_queue_size)
{
  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
				   0 /* want pthread */ ,
				   1 /* do map */ );
}

int
vl_client_connect_to_vlib_no_map (const char *svm_name,
				  const char *client_name, int rx_queue_size)
{
  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
				   1 /* want pthread */ ,
				   0 /* dont map */ );
}

int
vl_client_connect_to_vlib_no_rx_pthread_no_map (const char *svm_name,
						const char *client_name,
						int rx_queue_size)
{
  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
				   0 /* want pthread */ ,
				   0 /* dont map */ );
}

static void
disconnect_from_vlib_internal (u8 do_unmap)
{
  memory_client_main_t *mm = &memory_client_main;
  api_main_t *am = &api_main;
  uword junk;

  if (mm->rx_thread_jmpbuf_valid)
    {
      vl_api_rx_thread_exit_t *ep;
      ep = vl_msg_api_alloc (sizeof (*ep));
      ep->_vl_msg_id = ntohs (VL_API_RX_THREAD_EXIT);
      vl_msg_api_send_shmem (am->vl_input_queue, (u8 *) & ep);
      pthread_join (mm->rx_thread_handle, (void **) &junk);
    }
  if (mm->connected_to_vlib)
    {
      vl_client_disconnect ();
      if (do_unmap)
	vl_client_api_unmap ();
    }
  clib_memset (mm, 0, sizeof (*mm));
}

void
vl_client_disconnect_from_vlib (void)
{
  disconnect_from_vlib_internal (1);
}

void
vl_client_disconnect_from_vlib_no_unmap (void)
{
  disconnect_from_vlib_internal (0);
}

static void vl_api_get_first_msg_id_reply_t_handler
  (vl_api_get_first_msg_id_reply_t * mp)
{
  memory_client_main_t *mm = &memory_client_main;
  i32 retval = ntohl (mp->retval);

  mm->first_msg_id_reply = (retval >= 0) ? ntohs (mp->first_msg_id) : ~0;
  mm->first_msg_id_reply_ready = 1;
}

u16
vl_client_get_first_plugin_msg_id (const char *plugin_name)
{
  vl_api_get_first_msg_id_t *mp;
  api_main_t *am = &api_main;
  memory_client_main_t *mm = &memory_client_main;
  f64 timeout;
  void *old_handler;
  clib_time_t clib_time;
  u16 rv = ~0;

  size_t plugin_name_len = strnlen_s (plugin_name, 128);
  if (plugin_name_len == 128)
    return (rv);

  clib_memset (&clib_time, 0, sizeof (clib_time));
  clib_time_init (&clib_time);

  /* Push this plugin's first_msg_id_reply handler */
  old_handler = am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY];
  am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = (void *)
    vl_api_get_first_msg_id_reply_t_handler;

  /* Ask the data-plane for the message-ID base of the indicated plugin */
  mm->first_msg_id_reply_ready = 0;

  /* Not using shm client */
  if (!am->my_registration)
    {
      mp = vl_socket_client_msg_alloc (sizeof (*mp));
      clib_memset (mp, 0, sizeof (*mp));
      mp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID);
      mp->client_index = am->my_client_index;
      vl_api_to_api_string (plugin_name_len, plugin_name, &mp->name);

      if (vl_socket_client_write () <= 0)
	goto sock_err;
      if (vl_socket_client_read (1))
	goto sock_err;

      if (mm->first_msg_id_reply_ready == 1)
	{
	  rv = mm->first_msg_id_reply;
	  goto result;
	}

    sock_err:
      /* Restore old handler */
      am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;

      return -1;
    }
  else
    {
      mp = vl_msg_api_alloc (sizeof (*mp));
      clib_memset (mp, 0, sizeof (*mp));
      mp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID);
      mp->client_index = am->my_client_index;
      vl_api_to_api_string (plugin_name_len, plugin_name, &mp->name);

      vl_msg_api_send_shmem (am->shmem_hdr->vl_input_queue, (u8 *) & mp);

      /* Synchronously wait for the answer */
      timeout = clib_time_now (&clib_time) + 1.0;
      while (clib_time_now (&clib_time) < timeout)
	{
	  if (mm->first_msg_id_reply_ready == 1)
	    {
	      rv = mm->first_msg_id_reply;
	      goto result;
	    }
	}
      /* Restore old handler */
      am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;

      return rv;
    }

result:

  /* Restore the old handler */
  am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;

  if (rv == (u16) ~ 0)
    clib_warning ("plugin '%s' not registered", plugin_name);

  return rv;
}

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