src/vnet/session/segment_manager.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vnet/session/segment_manager.h>
  17 #include <vnet/session/session.h>
  18 #include <vnet/session/application.h>
  19
  20 /**
  21  * Counter used to build segment names
  22  */
  23 u32 segment_name_counter = 0;
  24
  25 /**
  26  * Pool of segment managers
  27  */
  28 segment_manager_t *segment_managers = 0;
  29
  30 /*
  31  * Pool of segment manager properties
  32  */
  33 static segment_manager_properties_t *segment_manager_properties_pool;
  34
  35 /**
  36  * Process private segment index
  37  */
  38 u32 *private_segment_indices;
  39
  40 /**
  41  * Default fifo and segment size. TODO config.
  42  */
  43 u32 default_fifo_size = 1 << 16;
  44 u32 default_segment_size = 1 << 20;
  45
  46 segment_manager_properties_t *
  47 segment_manager_properties_alloc (void)
  48 {
  49   segment_manager_properties_t *props;
  50   pool_get (segment_manager_properties_pool, props);
  51   memset (props, 0, sizeof (*props));
  52   return props;
  53 }
  54
  55 void
  56 segment_manager_properties_free (segment_manager_properties_t * props)
  57 {
  58   pool_put (segment_manager_properties_pool, props);
  59   memset (props, 0xFB, sizeof (*props));
  60 }
  61
  62 segment_manager_properties_t *
  63 segment_manager_properties_get (u32 smp_index)
  64 {
  65   if (pool_is_free_index (segment_manager_properties_pool, smp_index))
  66     return 0;
  67   return pool_elt_at_index (segment_manager_properties_pool, smp_index);
  68 }
  69
  70 u32
  71 segment_manager_properties_index (segment_manager_properties_t * p)
  72 {
  73   return p - segment_manager_properties_pool;
  74 }
  75
  76 void
  77 segment_manager_get_segment_info (u32 index, u8 ** name, u32 * size)
  78 {
  79   svm_fifo_segment_private_t *s;
  80   s = svm_fifo_segment_get_segment (index);
  81   *name = s->h->segment_name;
  82   *size = s->ssvm.ssvm_size;
  83 }
  84
  85 always_inline int
  86 session_manager_add_segment_i (segment_manager_t * sm, u32 segment_size,
  87                                u8 * segment_name)
  88 {
  89   svm_fifo_segment_create_args_t _ca, *ca = &_ca;
  90   segment_manager_properties_t *props;
  91   int rv;
  92
  93   memset (ca, 0, sizeof (*ca));
  94   props = segment_manager_properties_get (sm->properties_index);
  95   if (!props->use_private_segment)
  96     {
  97       ca->segment_name = (char *) segment_name;
  98       ca->segment_size = segment_size;
  99       ca->rx_fifo_size = props->rx_fifo_size;
 100       ca->tx_fifo_size = props->tx_fifo_size;
 101       ca->preallocated_fifo_pairs = props->preallocated_fifo_pairs;
 102
 103       rv = svm_fifo_segment_create (ca);
 104       if (rv)
 105         {
 106           clib_warning ("svm_fifo_segment_create ('%s', %d) failed",
 107                         ca->segment_name, ca->segment_size);
 108           return VNET_API_ERROR_SVM_SEGMENT_CREATE_FAIL;
 109         }
 110     }
 111   else
 112     {
 113       u32 rx_fifo_size, tx_fifo_size, rx_rounded_data_size,
 114         tx_rounded_data_size;
 115       u32 approx_segment_count;
 116       u64 approx_total_size;
 117
 118       ca->segment_name = "process-private-segment";
 119       ca->segment_size = segment_size;
 120       ca->rx_fifo_size = props->rx_fifo_size;
 121       ca->tx_fifo_size = props->tx_fifo_size;
 122       ca->preallocated_fifo_pairs = props->preallocated_fifo_pairs;
 123       ca->private_segment_count = props->private_segment_count;
 124
 125       /* Calculate space requirements */
 126       rx_rounded_data_size = (1 << (max_log2 (ca->rx_fifo_size)));
 127       tx_rounded_data_size = (1 << (max_log2 (ca->tx_fifo_size)));
 128
 129       rx_fifo_size = sizeof (svm_fifo_t) + rx_rounded_data_size;
 130       tx_fifo_size = sizeof (svm_fifo_t) + tx_rounded_data_size;
 131
 132       approx_total_size = (u64) ca->preallocated_fifo_pairs
 133         * (rx_fifo_size + tx_fifo_size);
 134       approx_segment_count = (approx_total_size + (ca->segment_size - 1))
 135         / (u64) ca->segment_size;
 136
 137       /* The user asked us to figure it out... */
 138       if (ca->private_segment_count == 0)
 139         {
 140           ca->private_segment_count = approx_segment_count;
 141         }
 142       /* Follow directions, but issue a warning */
 143       else if (approx_segment_count != ca->private_segment_count)
 144         {
 145           clib_warning ("Honoring segment count %u, calculated count was %u",
 146                         ca->private_segment_count, approx_segment_count);
 147         }
 148
 149       if (svm_fifo_segment_create_process_private (ca))
 150         clib_warning ("Failed to create process private segment");
 151
 152       ASSERT (vec_len (ca->new_segment_indices));
 153     }
 154   vec_append (sm->segment_indices, ca->new_segment_indices);
 155   vec_free (ca->new_segment_indices);
 156   return 0;
 157 }
 158
 159 int
 160 session_manager_add_segment (segment_manager_t * sm)
 161 {
 162   svm_fifo_segment_create_args_t _ca, *ca = &_ca;
 163   segment_manager_properties_t *props;
 164   u32 add_segment_size;
 165   u8 *segment_name;
 166   int rv;
 167
 168   memset (ca, 0, sizeof (*ca));
 169   props = segment_manager_properties_get (sm->properties_index);
 170   segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
 171   add_segment_size = props->add_segment_size ?
 172     props->add_segment_size : default_segment_size;
 173
 174   rv = session_manager_add_segment_i (sm, add_segment_size, segment_name);
 175   vec_free (segment_name);
 176   return rv;
 177 }
 178
 179 int
 180 session_manager_add_first_segment (segment_manager_t * sm, u32 segment_size)
 181 {
 182   u8 *segment_name;
 183   int rv;
 184
 185   segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
 186   rv = session_manager_add_segment_i (sm, segment_size, segment_name);
 187   vec_free (segment_name);
 188   return rv;
 189 }
 190
 191 segment_manager_t *
 192 segment_manager_new ()
 193 {
 194   segment_manager_t *sm;
 195   pool_get (segment_managers, sm);
 196   memset (sm, 0, sizeof (*sm));
 197   return sm;
 198 }
 199
 200 /**
 201  * Initializes segment manager based on options provided.
 202  * Returns error if svm segment allocation fails.
 203  */
 204 int
 205 segment_manager_init (segment_manager_t * sm, u32 props_index,
 206                       u32 first_seg_size)
 207 {
 208   int rv;
 209
 210   /* app allocates these */
 211   sm->properties_index = props_index;
 212   first_seg_size = first_seg_size > 0 ? first_seg_size : default_segment_size;
 213   rv = session_manager_add_first_segment (sm, first_seg_size);
 214   if (rv)
 215     {
 216       clib_warning ("Failed to allocate segment");
 217       return rv;
 218     }
 219
 220   clib_spinlock_init (&sm->lockp);
 221   return 0;
 222 }
 223
 224 u8
 225 segment_manager_has_fifos (segment_manager_t * sm)
 226 {
 227   svm_fifo_segment_private_t *segment;
 228   int i;
 229
 230   for (i = 0; i < vec_len (sm->segment_indices); i++)
 231     {
 232       segment = svm_fifo_segment_get_segment (sm->segment_indices[i]);
 233       if (CLIB_DEBUG && i && !svm_fifo_segment_has_fifos (segment)
 234           && !(segment->h->flags & FIFO_SEGMENT_F_IS_PREALLOCATED))
 235         clib_warning ("segment %d has no fifos!", sm->segment_indices[i]);
 236       if (svm_fifo_segment_has_fifos (segment))
 237         return 1;
 238     }
 239   return 0;
 240 }
 241
 242 static u8
 243 segment_manager_app_detached (segment_manager_t * sm)
 244 {
 245   return (sm->app_index == SEGMENT_MANAGER_INVALID_APP_INDEX);
 246 }
 247
 248 void
 249 segment_manager_app_detach (segment_manager_t * sm)
 250 {
 251   sm->app_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
 252 }
 253
 254 static void
 255 segment_manager_del_segment (segment_manager_t * sm, u32 segment_index)
 256 {
 257   svm_fifo_segment_private_t *fifo_segment;
 258   u32 svm_segment_index;
 259   clib_spinlock_lock (&sm->lockp);
 260   svm_segment_index = sm->segment_indices[segment_index];
 261   fifo_segment = svm_fifo_segment_get_segment (svm_segment_index);
 262   if (!fifo_segment
 263       || ((fifo_segment->h->flags & FIFO_SEGMENT_F_IS_PREALLOCATED)
 264           && !segment_manager_app_detached (sm)))
 265     {
 266       clib_spinlock_unlock (&sm->lockp);
 267       return;
 268     }
 269   svm_fifo_segment_delete (fifo_segment);
 270   vec_del1 (sm->segment_indices, segment_index);
 271   clib_spinlock_unlock (&sm->lockp);
 272 }
 273
 274 /**
 275  * Initiate disconnects for all sessions 'owned' by a segment manager
 276  */
 277 void
 278 segment_manager_del_sessions (segment_manager_t * sm)
 279 {
 280   int j;
 281   svm_fifo_segment_private_t *fifo_segment;
 282   svm_fifo_t *fifo;
 283
 284   ASSERT (vec_len (sm->segment_indices));
 285
 286   /* Across all fifo segments used by the server */
 287   for (j = 0; j < vec_len (sm->segment_indices); j++)
 288     {
 289       fifo_segment = svm_fifo_segment_get_segment (sm->segment_indices[j]);
 290       fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
 291
 292       /*
 293        * Remove any residual sessions from the session lookup table
 294        * Don't bother deleting the individual fifos, we're going to
 295        * throw away the fifo segment in a minute.
 296        */
 297       while (fifo)
 298         {
 299           u32 session_index, thread_index;
 300           stream_session_t *session;
 301
 302           session_index = fifo->master_session_index;
 303           thread_index = fifo->master_thread_index;
 304           session = session_get (session_index, thread_index);
 305
 306           /* Instead of directly removing the session call disconnect */
 307           if (session->session_state != SESSION_STATE_CLOSED)
 308             {
 309               session->session_state = SESSION_STATE_CLOSED;
 310               session_send_session_evt_to_thread (session_handle
 311                                                   (session),
 312                                                   FIFO_EVENT_DISCONNECT,
 313                                                   thread_index);
 314             }
 315           fifo = fifo->next;
 316         }
 317
 318       /* Instead of removing the segment, test when cleaning up disconnected
 319        * sessions if the segment can be removed.
 320        */
 321     }
 322 }
 323
 324 /**
 325  * Removes segment manager.
 326  *
 327  * Since the fifos allocated in the segment keep backpointers to the sessions
 328  * prior to removing the segment, we call session disconnect. This
 329  * subsequently propagates into transport.
 330  */
 331 void
 332 segment_manager_del (segment_manager_t * sm)
 333 {
 334   int i;
 335
 336   ASSERT (!segment_manager_has_fifos (sm)
 337           && segment_manager_app_detached (sm));
 338
 339   /* If we have empty preallocated segments that haven't been removed, remove
 340    * them now. Apart from that, the first segment in the first segment manager
 341    * is not removed when all fifos are removed. It can only be removed when
 342    * the manager is explicitly deleted/detached by the app. */
 343   for (i = vec_len (sm->segment_indices) - 1; i >= 0; i--)
 344     {
 345       if (CLIB_DEBUG)
 346         {
 347           svm_fifo_segment_private_t *segment;
 348           segment = svm_fifo_segment_get_segment (sm->segment_indices[i]);
 349           ASSERT (!svm_fifo_segment_has_fifos (segment));
 350         }
 351       segment_manager_del_segment (sm, i);
 352     }
 353   clib_spinlock_free (&sm->lockp);
 354   if (CLIB_DEBUG)
 355     memset (sm, 0xfe, sizeof (*sm));
 356   pool_put (segment_managers, sm);
 357 }
 358
 359 void
 360 segment_manager_init_del (segment_manager_t * sm)
 361 {
 362   segment_manager_app_detach (sm);
 363   if (segment_manager_has_fifos (sm))
 364     segment_manager_del_sessions (sm);
 365   else
 366     {
 367       ASSERT (!sm->first_is_protected || segment_manager_app_detached (sm));
 368       segment_manager_del (sm);
 369     }
 370 }
 371
 372 int
 373 segment_manager_alloc_session_fifos (segment_manager_t * sm,
 374                                      svm_fifo_t ** server_rx_fifo,
 375                                      svm_fifo_t ** server_tx_fifo,
 376                                      u32 * fifo_segment_index)
 377 {
 378   svm_fifo_segment_private_t *fifo_segment;
 379   segment_manager_properties_t *props;
 380   u32 fifo_size, sm_index;
 381   u8 added_a_segment = 0;
 382   int i;
 383
 384   ASSERT (vec_len (sm->segment_indices));
 385
 386   /* Make sure we don't have multiple threads trying to allocate segments
 387    * at the same time. */
 388   clib_spinlock_lock (&sm->lockp);
 389
 390   /* Allocate svm fifos */
 391   props = segment_manager_properties_get (sm->properties_index);
 392 again:
 393   for (i = 0; i < vec_len (sm->segment_indices); i++)
 394     {
 395       *fifo_segment_index = sm->segment_indices[i];
 396       fifo_segment = svm_fifo_segment_get_segment (*fifo_segment_index);
 397
 398       fifo_size = props->rx_fifo_size;
 399       fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
 400       *server_rx_fifo =
 401         svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size,
 402                                      FIFO_SEGMENT_RX_FREELIST);
 403
 404       fifo_size = props->tx_fifo_size;
 405       fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
 406       *server_tx_fifo =
 407         svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size,
 408                                      FIFO_SEGMENT_TX_FREELIST);
 409
 410       if (*server_rx_fifo == 0)
 411         {
 412           /* This would be very odd, but handle it... */
 413           if (*server_tx_fifo != 0)
 414             {
 415               svm_fifo_segment_free_fifo (fifo_segment, *server_tx_fifo,
 416                                           FIFO_SEGMENT_TX_FREELIST);
 417               *server_tx_fifo = 0;
 418             }
 419           continue;
 420         }
 421       if (*server_tx_fifo == 0)
 422         {
 423           if (*server_rx_fifo != 0)
 424             {
 425               svm_fifo_segment_free_fifo (fifo_segment, *server_rx_fifo,
 426                                           FIFO_SEGMENT_RX_FREELIST);
 427               *server_rx_fifo = 0;
 428             }
 429           continue;
 430         }
 431       break;
 432     }
 433
 434   /* See if we're supposed to create another segment */
 435   if (*server_rx_fifo == 0)
 436     {
 437       if (props->add_segment && !props->use_private_segment)
 438         {
 439           if (added_a_segment)
 440             {
 441               clib_warning ("added a segment, still can't allocate a fifo");
 442               clib_spinlock_unlock (&sm->lockp);
 443               return SESSION_ERROR_NEW_SEG_NO_SPACE;
 444             }
 445
 446           if (session_manager_add_segment (sm))
 447             {
 448               clib_spinlock_unlock (&sm->lockp);
 449               return VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
 450             }
 451
 452           added_a_segment = 1;
 453           goto again;
 454         }
 455       else
 456         {
 457           clib_warning ("No space to allocate fifos!");
 458           clib_spinlock_unlock (&sm->lockp);
 459           return SESSION_ERROR_NO_SPACE;
 460         }
 461     }
 462
 463   /* Backpointers to segment manager */
 464   sm_index = segment_manager_index (sm);
 465   (*server_tx_fifo)->segment_manager = sm_index;
 466   (*server_rx_fifo)->segment_manager = sm_index;
 467
 468   clib_spinlock_unlock (&sm->lockp);
 469
 470   if (added_a_segment)
 471     return application_add_segment_notify (sm->app_index,
 472                                            *fifo_segment_index);
 473
 474   return 0;
 475 }
 476
 477 void
 478 segment_manager_dealloc_fifos (u32 svm_segment_index, svm_fifo_t * rx_fifo,
 479                                svm_fifo_t * tx_fifo)
 480 {
 481   segment_manager_t *sm;
 482   svm_fifo_segment_private_t *fifo_segment;
 483   u32 i, segment_index = ~0;
 484   u8 is_first;
 485
 486   sm = segment_manager_get_if_valid (rx_fifo->segment_manager);
 487
 488   /* It's possible to have no segment manager if the session was removed
 489    * as result of a detach. */
 490   if (!sm)
 491     return;
 492
 493   fifo_segment = svm_fifo_segment_get_segment (svm_segment_index);
 494   svm_fifo_segment_free_fifo (fifo_segment, rx_fifo,
 495                               FIFO_SEGMENT_RX_FREELIST);
 496   svm_fifo_segment_free_fifo (fifo_segment, tx_fifo,
 497                               FIFO_SEGMENT_TX_FREELIST);
 498
 499   /*
 500    * Try to remove svm segment if it has no fifos. This can be done only if
 501    * the segment is not the first in the segment manager or if it is first
 502    * and it is not protected. Moreover, if the segment is first and the app
 503    * has detached from the segment manager, remove the segment manager.
 504    */
 505   if (!svm_fifo_segment_has_fifos (fifo_segment))
 506     {
 507       is_first = sm->segment_indices[0] == svm_segment_index;
 508
 509       /* Remove segment if it holds no fifos or first but not protected */
 510       if (!is_first || !sm->first_is_protected)
 511         {
 512           /* Find the segment manager segment index */
 513           for (i = 0; i < vec_len (sm->segment_indices); i++)
 514             if (sm->segment_indices[i] == svm_segment_index)
 515               {
 516                 segment_index = i;
 517                 break;
 518               }
 519           ASSERT (segment_index != (u32) ~ 0);
 520           segment_manager_del_segment (sm, segment_index);
 521         }
 522
 523       /* Remove segment manager if no sessions and detached from app */
 524       if (segment_manager_app_detached (sm)
 525           && !segment_manager_has_fifos (sm))
 526         segment_manager_del (sm);
 527     }
 528 }
 529
 530 /**
 531  * Allocates shm queue in the first segment
 532  */
 533 unix_shared_memory_queue_t *
 534 segment_manager_alloc_queue (segment_manager_t * sm, u32 queue_size)
 535 {
 536   ssvm_shared_header_t *sh;
 537   svm_fifo_segment_private_t *segment;
 538   unix_shared_memory_queue_t *q;
 539   void *oldheap;
 540
 541   ASSERT (sm->segment_indices != 0);
 542
 543   segment = svm_fifo_segment_get_segment (sm->segment_indices[0]);
 544   sh = segment->ssvm.sh;
 545
 546   oldheap = ssvm_push_heap (sh);
 547   q = unix_shared_memory_queue_init (queue_size,
 548                                      sizeof (session_fifo_event_t),
 549                                      0 /* consumer pid */ ,
 550                                      0 /* signal when queue non-empty */ );
 551   ssvm_pop_heap (oldheap);
 552   return q;
 553 }
 554
 555 /**
 556  * Frees shm queue allocated in the first segment
 557  */
 558 void
 559 segment_manager_dealloc_queue (segment_manager_t * sm,
 560                                unix_shared_memory_queue_t * q)
 561 {
 562   ssvm_shared_header_t *sh;
 563   svm_fifo_segment_private_t *segment;
 564   void *oldheap;
 565
 566   ASSERT (sm->segment_indices != 0);
 567
 568   segment = svm_fifo_segment_get_segment (sm->segment_indices[0]);
 569   sh = segment->ssvm.sh;
 570
 571   oldheap = ssvm_push_heap (sh);
 572   unix_shared_memory_queue_free (q);
 573   ssvm_pop_heap (oldheap);
 574 }
 575
 576 static clib_error_t *
 577 segment_manager_show_fn (vlib_main_t * vm, unformat_input_t * input,
 578                          vlib_cli_command_t * cmd)
 579 {
 580   svm_fifo_segment_private_t *segments, *seg;
 581   segment_manager_t *sm;
 582   u8 show_segments = 0, verbose = 0, *name;
 583   uword address;
 584   u64 size;
 585   u32 active_fifos;
 586   u32 free_fifos;
 587
 588   mheap_t *heap_header;
 589
 590   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 591     {
 592       if (unformat (input, "segments"))
 593         show_segments = 1;
 594       else if (unformat (input, "verbose"))
 595         verbose = 1;
 596       else
 597         return clib_error_return (0, "unknown input `%U'",
 598                                   format_unformat_error, input);
 599     }
 600   vlib_cli_output (vm, "%d segment managers allocated",
 601                    pool_elts (segment_managers));
 602   if (verbose && pool_elts (segment_managers))
 603     {
 604       vlib_cli_output (vm, "%-10s%=15s%=12s", "Index", "App Index",
 605                        "Segments");
 606
 607       /* *INDENT-OFF* */
 608       pool_foreach (sm, segment_managers, ({
 609         vlib_cli_output (vm, "%-10d%=15d%=12d", segment_manager_index(sm),
 610                            sm->app_index, vec_len (sm->segment_indices));
 611       }));
 612       /* *INDENT-ON* */
 613
 614     }
 615   if (show_segments)
 616     {
 617       segments = svm_fifo_segment_segments_pool ();
 618       vlib_cli_output (vm, "%d svm fifo segments allocated",
 619                        pool_elts (segments));
 620       vlib_cli_output (vm, "%-25s%15s%16s%16s%16s", "Name",
 621                        "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
 622
 623       /* *INDENT-OFF* */
 624       pool_foreach (seg, segments, ({
 625         if (seg->h->flags & FIFO_SEGMENT_F_IS_PRIVATE)
 626           {
 627             address = pointer_to_uword (seg->ssvm.sh->heap);
 628             if (seg->h->flags & FIFO_SEGMENT_F_IS_MAIN_HEAP)
 629               name = format (0, "main heap");
 630             else
 631               name = format (0, "private heap");
 632             heap_header = mheap_header (seg->ssvm.sh->heap);
 633             size = heap_header->max_size;
 634           }
 635         else
 636           {
 637             address =  seg->ssvm.sh->ssvm_va;
 638             size = seg->ssvm.ssvm_size;
 639             name = seg->ssvm.sh->name;
 640           }
 641         active_fifos = svm_fifo_segment_num_fifos (seg);
 642         free_fifos = svm_fifo_segment_num_free_fifos (seg, ~0 /* size */);
 643         vlib_cli_output (vm, "%-25v%15llu%16u%16u%16llx",
 644                          name, size >> 20ULL, active_fifos, free_fifos,
 645                          address);
 646         if (verbose)
 647           vlib_cli_output (vm, "%U",
 648                            format_svm_fifo_segment, seg, verbose);
 649         if (seg->h->flags & FIFO_SEGMENT_F_IS_PRIVATE)
 650           vec_free (name);
 651       }));
 652       /* *INDENT-ON* */
 653
 654     }
 655   return 0;
 656 }
 657
 658 /* *INDENT-OFF* */
 659 VLIB_CLI_COMMAND (segment_manager_show_command, static) =
 660 {
 661   .path = "show segment-manager",
 662   .short_help = "show segment-manager [segments][verbose]",
 663   .function = segment_manager_show_fn,
 664 };
 665 /* *INDENT-ON* */
 666
 667 /*
 668  * fd.io coding-style-patch-verification: ON
 669  *
 670  * Local Variables:
 671  * eval: (c-set-style "gnu")
 672  * End:
 673  */