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 = ~0;
 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       ca->private_segment_size = props->private_segment_size;
 125
 126       /* Default to a small private segment */
 127       if (ca->private_segment_size == 0)
 128         ca->private_segment_size = 128 << 20;
 129
 130       /* Calculate space requirements */
 131       rx_rounded_data_size = (1 << (max_log2 (ca->rx_fifo_size)));
 132       tx_rounded_data_size = (1 << (max_log2 (ca->tx_fifo_size)));
 133
 134       rx_fifo_size = sizeof (svm_fifo_t) + rx_rounded_data_size;
 135       tx_fifo_size = sizeof (svm_fifo_t) + tx_rounded_data_size;
 136
 137       approx_total_size = (u64) ca->preallocated_fifo_pairs
 138         * (rx_fifo_size + tx_fifo_size);
 139       approx_segment_count =
 140         (approx_total_size +
 141          (ca->private_segment_size - 1)) / (u64) ca->private_segment_size;
 142
 143       /* The user asked us to figure it out... */
 144       if (ca->private_segment_count == 0)
 145         {
 146           ca->private_segment_count = approx_segment_count;
 147         }
 148       /* Follow directions, but issue a warning */
 149       else if (approx_segment_count != ca->private_segment_count)
 150         {
 151           clib_warning
 152             ("Honoring segment count %u, but calculated count was %u",
 153              ca->private_segment_count, approx_segment_count);
 154         }
 155
 156       if (svm_fifo_segment_create_process_private (ca))
 157         clib_warning ("Failed to create process private segment");
 158
 159       ASSERT (vec_len (ca->new_segment_indices));
 160     }
 161   vec_append (sm->segment_indices, ca->new_segment_indices);
 162   vec_free (ca->new_segment_indices);
 163   return 0;
 164 }
 165
 166 int
 167 session_manager_add_segment (segment_manager_t * sm)
 168 {
 169   svm_fifo_segment_create_args_t _ca, *ca = &_ca;
 170   segment_manager_properties_t *props;
 171   u32 add_segment_size;
 172   u8 *segment_name;
 173   int rv;
 174
 175   memset (ca, 0, sizeof (*ca));
 176   props = segment_manager_properties_get (sm->properties_index);
 177   segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
 178   add_segment_size = props->add_segment_size ?
 179     props->add_segment_size : default_segment_size;
 180
 181   rv = session_manager_add_segment_i (sm, add_segment_size, segment_name);
 182   vec_free (segment_name);
 183   return rv;
 184 }
 185
 186 int
 187 session_manager_add_first_segment (segment_manager_t * sm, u32 segment_size)
 188 {
 189   u8 *segment_name;
 190   int rv;
 191
 192   segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
 193   rv = session_manager_add_segment_i (sm, segment_size, segment_name);
 194   vec_free (segment_name);
 195   return rv;
 196 }
 197
 198 segment_manager_t *
 199 segment_manager_new ()
 200 {
 201   segment_manager_t *sm;
 202   pool_get (segment_managers, sm);
 203   memset (sm, 0, sizeof (*sm));
 204   return sm;
 205 }
 206
 207 /**
 208  * Initializes segment manager based on options provided.
 209  * Returns error if svm segment allocation fails.
 210  */
 211 int
 212 segment_manager_init (segment_manager_t * sm, u32 props_index,
 213                       u32 first_seg_size)
 214 {
 215   int rv;
 216
 217   /* app allocates these */
 218   sm->properties_index = props_index;
 219   first_seg_size = first_seg_size > 0 ? first_seg_size : default_segment_size;
 220   rv = session_manager_add_first_segment (sm, first_seg_size);
 221   if (rv)
 222     {
 223       clib_warning ("Failed to allocate segment");
 224       return rv;
 225     }
 226
 227   clib_spinlock_init (&sm->lockp);
 228   return 0;
 229 }
 230
 231 u8
 232 segment_manager_has_fifos (segment_manager_t * sm)
 233 {
 234   svm_fifo_segment_private_t *segment;
 235   int i;
 236
 237   for (i = 0; i < vec_len (sm->segment_indices); i++)
 238     {
 239       segment = svm_fifo_segment_get_segment (sm->segment_indices[i]);
 240       if (CLIB_DEBUG && i && !svm_fifo_segment_has_fifos (segment)
 241           && !(segment->h->flags & FIFO_SEGMENT_F_IS_PREALLOCATED))
 242         clib_warning ("segment %d has no fifos!", sm->segment_indices[i]);
 243       if (svm_fifo_segment_has_fifos (segment))
 244         return 1;
 245     }
 246   return 0;
 247 }
 248
 249 static u8
 250 segment_manager_app_detached (segment_manager_t * sm)
 251 {
 252   return (sm->app_index == SEGMENT_MANAGER_INVALID_APP_INDEX);
 253 }
 254
 255 void
 256 segment_manager_app_detach (segment_manager_t * sm)
 257 {
 258   sm->app_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
 259 }
 260
 261 static void
 262 segment_manager_del_segment (segment_manager_t * sm, u32 segment_index)
 263 {
 264   svm_fifo_segment_private_t *fifo_segment;
 265   u32 svm_segment_index;
 266   clib_spinlock_lock (&sm->lockp);
 267   svm_segment_index = sm->segment_indices[segment_index];
 268   fifo_segment = svm_fifo_segment_get_segment (svm_segment_index);
 269   if (!fifo_segment
 270       || ((fifo_segment->h->flags & FIFO_SEGMENT_F_IS_PREALLOCATED)
 271           && !segment_manager_app_detached (sm)))
 272     {
 273       clib_spinlock_unlock (&sm->lockp);
 274       return;
 275     }
 276   svm_fifo_segment_delete (fifo_segment);
 277   vec_del1 (sm->segment_indices, segment_index);
 278   clib_spinlock_unlock (&sm->lockp);
 279 }
 280
 281 /**
 282  * Initiate disconnects for all sessions 'owned' by a segment manager
 283  */
 284 void
 285 segment_manager_del_sessions (segment_manager_t * sm)
 286 {
 287   int j;
 288   svm_fifo_segment_private_t *fifo_segment;
 289   svm_fifo_t *fifo;
 290
 291   ASSERT (vec_len (sm->segment_indices));
 292
 293   /* Across all fifo segments used by the server */
 294   for (j = 0; j < vec_len (sm->segment_indices); j++)
 295     {
 296       fifo_segment = svm_fifo_segment_get_segment (sm->segment_indices[j]);
 297       fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
 298
 299       /*
 300        * Remove any residual sessions from the session lookup table
 301        * Don't bother deleting the individual fifos, we're going to
 302        * throw away the fifo segment in a minute.
 303        */
 304       while (fifo)
 305         {
 306           u32 session_index, thread_index;
 307           stream_session_t *session;
 308
 309           session_index = fifo->master_session_index;
 310           thread_index = fifo->master_thread_index;
 311           session = session_get (session_index, thread_index);
 312
 313           /* Instead of directly removing the session call disconnect */
 314           if (session->session_state != SESSION_STATE_CLOSED)
 315             {
 316               session->session_state = SESSION_STATE_CLOSED;
 317               session_send_session_evt_to_thread (session_handle
 318                                                   (session),
 319                                                   FIFO_EVENT_DISCONNECT,
 320                                                   thread_index);
 321             }
 322           fifo = fifo->next;
 323         }
 324
 325       /* Instead of removing the segment, test when cleaning up disconnected
 326        * sessions if the segment can be removed.
 327        */
 328     }
 329 }
 330
 331 /**
 332  * Removes segment manager.
 333  *
 334  * Since the fifos allocated in the segment keep backpointers to the sessions
 335  * prior to removing the segment, we call session disconnect. This
 336  * subsequently propagates into transport.
 337  */
 338 void
 339 segment_manager_del (segment_manager_t * sm)
 340 {
 341   int i;
 342
 343   ASSERT (!segment_manager_has_fifos (sm)
 344           && segment_manager_app_detached (sm));
 345
 346   /* If we have empty preallocated segments that haven't been removed, remove
 347    * them now. Apart from that, the first segment in the first segment manager
 348    * is not removed when all fifos are removed. It can only be removed when
 349    * the manager is explicitly deleted/detached by the app. */
 350   for (i = vec_len (sm->segment_indices) - 1; i >= 0; i--)
 351     {
 352       if (CLIB_DEBUG)
 353         {
 354           svm_fifo_segment_private_t *segment;
 355           segment = svm_fifo_segment_get_segment (sm->segment_indices[i]);
 356           ASSERT (!svm_fifo_segment_has_fifos (segment));
 357         }
 358       segment_manager_del_segment (sm, i);
 359     }
 360   clib_spinlock_free (&sm->lockp);
 361   if (CLIB_DEBUG)
 362     memset (sm, 0xfe, sizeof (*sm));
 363   pool_put (segment_managers, sm);
 364 }
 365
 366 void
 367 segment_manager_init_del (segment_manager_t * sm)
 368 {
 369   segment_manager_app_detach (sm);
 370   if (segment_manager_has_fifos (sm))
 371     segment_manager_del_sessions (sm);
 372   else
 373     {
 374       ASSERT (!sm->first_is_protected || segment_manager_app_detached (sm));
 375       segment_manager_del (sm);
 376     }
 377 }
 378
 379 int
 380 segment_manager_alloc_session_fifos (segment_manager_t * sm,
 381                                      svm_fifo_t ** server_rx_fifo,
 382                                      svm_fifo_t ** server_tx_fifo,
 383                                      u32 * fifo_segment_index)
 384 {
 385   svm_fifo_segment_private_t *fifo_segment;
 386   segment_manager_properties_t *props;
 387   u32 fifo_size, sm_index;
 388   u8 added_a_segment = 0;
 389   int i;
 390
 391   ASSERT (vec_len (sm->segment_indices));
 392
 393   /* Make sure we don't have multiple threads trying to allocate segments
 394    * at the same time. */
 395   clib_spinlock_lock (&sm->lockp);
 396
 397   /* Allocate svm fifos */
 398   props = segment_manager_properties_get (sm->properties_index);
 399 again:
 400   for (i = 0; i < vec_len (sm->segment_indices); i++)
 401     {
 402       *fifo_segment_index = sm->segment_indices[i];
 403       fifo_segment = svm_fifo_segment_get_segment (*fifo_segment_index);
 404
 405       fifo_size = props->rx_fifo_size;
 406       fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
 407       *server_rx_fifo =
 408         svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size,
 409                                      FIFO_SEGMENT_RX_FREELIST);
 410
 411       fifo_size = props->tx_fifo_size;
 412       fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
 413       *server_tx_fifo =
 414         svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size,
 415                                      FIFO_SEGMENT_TX_FREELIST);
 416
 417       if (*server_rx_fifo == 0)
 418         {
 419           /* This would be very odd, but handle it... */
 420           if (*server_tx_fifo != 0)
 421             {
 422               svm_fifo_segment_free_fifo (fifo_segment, *server_tx_fifo,
 423                                           FIFO_SEGMENT_TX_FREELIST);
 424               *server_tx_fifo = 0;
 425             }
 426           continue;
 427         }
 428       if (*server_tx_fifo == 0)
 429         {
 430           if (*server_rx_fifo != 0)
 431             {
 432               svm_fifo_segment_free_fifo (fifo_segment, *server_rx_fifo,
 433                                           FIFO_SEGMENT_RX_FREELIST);
 434               *server_rx_fifo = 0;
 435             }
 436           continue;
 437         }
 438       break;
 439     }
 440
 441   /* See if we're supposed to create another segment */
 442   if (*server_rx_fifo == 0)
 443     {
 444       if (props->add_segment && !props->use_private_segment)
 445         {
 446           if (added_a_segment)
 447             {
 448               clib_warning ("added a segment, still can't allocate a fifo");
 449               clib_spinlock_unlock (&sm->lockp);
 450               return SESSION_ERROR_NEW_SEG_NO_SPACE;
 451             }
 452
 453           if (session_manager_add_segment (sm))
 454             {
 455               clib_spinlock_unlock (&sm->lockp);
 456               return VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
 457             }
 458
 459           added_a_segment = 1;
 460           goto again;
 461         }
 462       else
 463         {
 464           clib_warning ("No space to allocate fifos!");
 465           clib_spinlock_unlock (&sm->lockp);
 466           return SESSION_ERROR_NO_SPACE;
 467         }
 468     }
 469
 470   /* Backpointers to segment manager */
 471   sm_index = segment_manager_index (sm);
 472   (*server_tx_fifo)->segment_manager = sm_index;
 473   (*server_rx_fifo)->segment_manager = sm_index;
 474
 475   clib_spinlock_unlock (&sm->lockp);
 476
 477   if (added_a_segment)
 478     return application_add_segment_notify (sm->app_index,
 479                                            *fifo_segment_index);
 480
 481   return 0;
 482 }
 483
 484 void
 485 segment_manager_dealloc_fifos (u32 svm_segment_index, svm_fifo_t * rx_fifo,
 486                                svm_fifo_t * tx_fifo)
 487 {
 488   segment_manager_t *sm;
 489   svm_fifo_segment_private_t *fifo_segment;
 490   u32 i, segment_index = ~0;
 491   u8 is_first;
 492
 493   sm = segment_manager_get_if_valid (rx_fifo->segment_manager);
 494
 495   /* It's possible to have no segment manager if the session was removed
 496    * as result of a detach. */
 497   if (!sm)
 498     return;
 499
 500   fifo_segment = svm_fifo_segment_get_segment (svm_segment_index);
 501   svm_fifo_segment_free_fifo (fifo_segment, rx_fifo,
 502                               FIFO_SEGMENT_RX_FREELIST);
 503   svm_fifo_segment_free_fifo (fifo_segment, tx_fifo,
 504                               FIFO_SEGMENT_TX_FREELIST);
 505
 506   /*
 507    * Try to remove svm segment if it has no fifos. This can be done only if
 508    * the segment is not the first in the segment manager or if it is first
 509    * and it is not protected. Moreover, if the segment is first and the app
 510    * has detached from the segment manager, remove the segment manager.
 511    */
 512   if (!svm_fifo_segment_has_fifos (fifo_segment))
 513     {
 514       is_first = sm->segment_indices[0] == svm_segment_index;
 515
 516       /* Remove segment if it holds no fifos or first but not protected */
 517       if (!is_first || !sm->first_is_protected)
 518         {
 519           /* Find the segment manager segment index */
 520           for (i = 0; i < vec_len (sm->segment_indices); i++)
 521             if (sm->segment_indices[i] == svm_segment_index)
 522               {
 523                 segment_index = i;
 524                 break;
 525               }
 526           ASSERT (segment_index != (u32) ~ 0);
 527           segment_manager_del_segment (sm, segment_index);
 528         }
 529
 530       /* Remove segment manager if no sessions and detached from app */
 531       if (segment_manager_app_detached (sm)
 532           && !segment_manager_has_fifos (sm))
 533         segment_manager_del (sm);
 534     }
 535 }
 536
 537 /**
 538  * Allocates shm queue in the first segment
 539  */
 540 unix_shared_memory_queue_t *
 541 segment_manager_alloc_queue (segment_manager_t * sm, u32 queue_size)
 542 {
 543   ssvm_shared_header_t *sh;
 544   svm_fifo_segment_private_t *segment;
 545   unix_shared_memory_queue_t *q;
 546   void *oldheap;
 547
 548   ASSERT (sm->segment_indices != 0);
 549
 550   segment = svm_fifo_segment_get_segment (sm->segment_indices[0]);
 551   sh = segment->ssvm.sh;
 552
 553   oldheap = ssvm_push_heap (sh);
 554   q = unix_shared_memory_queue_init (queue_size,
 555                                      sizeof (session_fifo_event_t),
 556                                      0 /* consumer pid */ ,
 557                                      0 /* signal when queue non-empty */ );
 558   ssvm_pop_heap (oldheap);
 559   return q;
 560 }
 561
 562 /**
 563  * Frees shm queue allocated in the first segment
 564  */
 565 void
 566 segment_manager_dealloc_queue (segment_manager_t * sm,
 567                                unix_shared_memory_queue_t * q)
 568 {
 569   ssvm_shared_header_t *sh;
 570   svm_fifo_segment_private_t *segment;
 571   void *oldheap;
 572
 573   ASSERT (sm->segment_indices != 0);
 574
 575   segment = svm_fifo_segment_get_segment (sm->segment_indices[0]);
 576   sh = segment->ssvm.sh;
 577
 578   oldheap = ssvm_push_heap (sh);
 579   unix_shared_memory_queue_free (q);
 580   ssvm_pop_heap (oldheap);
 581 }
 582
 583 static clib_error_t *
 584 segment_manager_show_fn (vlib_main_t * vm, unformat_input_t * input,
 585                          vlib_cli_command_t * cmd)
 586 {
 587   svm_fifo_segment_private_t *segments, *seg;
 588   segment_manager_t *sm;
 589   u8 show_segments = 0, verbose = 0, *name;
 590   uword address;
 591   u64 size;
 592   u32 active_fifos;
 593   u32 free_fifos;
 594
 595   mheap_t *heap_header;
 596
 597   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 598     {
 599       if (unformat (input, "segments"))
 600         show_segments = 1;
 601       else if (unformat (input, "verbose"))
 602         verbose = 1;
 603       else
 604         return clib_error_return (0, "unknown input `%U'",
 605                                   format_unformat_error, input);
 606     }
 607   vlib_cli_output (vm, "%d segment managers allocated",
 608                    pool_elts (segment_managers));
 609   if (verbose && pool_elts (segment_managers))
 610     {
 611       vlib_cli_output (vm, "%-10s%=15s%=12s", "Index", "App Index",
 612                        "Segments");
 613
 614       /* *INDENT-OFF* */
 615       pool_foreach (sm, segment_managers, ({
 616         vlib_cli_output (vm, "%-10d%=15d%=12d", segment_manager_index(sm),
 617                            sm->app_index, vec_len (sm->segment_indices));
 618       }));
 619       /* *INDENT-ON* */
 620
 621     }
 622   if (show_segments)
 623     {
 624       segments = svm_fifo_segment_segments_pool ();
 625       vlib_cli_output (vm, "%d svm fifo segments allocated",
 626                        pool_elts (segments));
 627       vlib_cli_output (vm, "%-20s%=12s%=16s%=16s%=16s", "Name",
 628                        "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
 629
 630       /* *INDENT-OFF* */
 631       pool_foreach (seg, segments, ({
 632         if (seg->h->flags & FIFO_SEGMENT_F_IS_PRIVATE)
 633           {
 634             address = pointer_to_uword (seg->ssvm.sh->heap);
 635             if (seg->h->flags & FIFO_SEGMENT_F_IS_MAIN_HEAP)
 636               name = format (0, "main heap");
 637             else
 638               name = format (0, "private heap");
 639             heap_header = mheap_header (seg->ssvm.sh->heap);
 640             size = heap_header->max_size;
 641           }
 642         else
 643           {
 644             address =  seg->ssvm.sh->ssvm_va;
 645             size = seg->ssvm.ssvm_size;
 646             name = seg->ssvm.sh->name;
 647           }
 648         active_fifos = svm_fifo_segment_num_fifos (seg);
 649         free_fifos = svm_fifo_segment_num_free_fifos (seg, ~0 /* size */);
 650         vlib_cli_output (vm, "%-20v%=16llu%=16u%=16u%16llx",
 651                          name, size >> 20ULL, active_fifos, free_fifos,
 652                          address);
 653         if (verbose)
 654           vlib_cli_output (vm, "%U",
 655                            format_svm_fifo_segment, seg, verbose);
 656         if (seg->h->flags & FIFO_SEGMENT_F_IS_PRIVATE)
 657           vec_free (name);
 658       }));
 659       /* *INDENT-ON* */
 660
 661     }
 662   return 0;
 663 }
 664
 665 /* *INDENT-OFF* */
 666 VLIB_CLI_COMMAND (segment_manager_show_command, static) =
 667 {
 668   .path = "show segment-manager",
 669   .short_help = "show segment-manager [segments][verbose]",
 670   .function = segment_manager_show_fn,
 671 };
 672 /* *INDENT-ON* */
 673
 674 /*
 675  * fd.io coding-style-patch-verification: ON
 676  *
 677  * Local Variables:
 678  * eval: (c-set-style "gnu")
 679  * End:
 680  */