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 segment_manager_main_t segment_manager_main;
  21
  22 /**
  23  * Counter used to build segment names
  24  */
  25 static u32 segment_name_counter = 0;
  26
  27 /**
  28  * Default fifo and segment size. TODO config.
  29  */
  30 static u32 default_fifo_size = 1 << 12;
  31 static u32 default_segment_size = 1 << 20;
  32 static u32 default_app_evt_queue_size = 128;
  33
  34 segment_manager_properties_t *
  35 segment_manager_properties_get (segment_manager_t * sm)
  36 {
  37   return application_get_segment_manager_properties (sm->app_index);
  38 }
  39
  40 segment_manager_properties_t *
  41 segment_manager_properties_init (segment_manager_properties_t * props)
  42 {
  43   props->add_segment_size = default_segment_size;
  44   props->rx_fifo_size = default_fifo_size;
  45   props->tx_fifo_size = default_fifo_size;
  46   props->evt_q_size = default_app_evt_queue_size;
  47   return props;
  48 }
  49
  50 static u8
  51 segment_manager_app_detached (segment_manager_t * sm)
  52 {
  53   return (sm->app_index == SEGMENT_MANAGER_INVALID_APP_INDEX);
  54 }
  55
  56 void
  57 segment_manager_app_detach (segment_manager_t * sm)
  58 {
  59   sm->app_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
  60 }
  61
  62 always_inline u32
  63 segment_manager_segment_index (segment_manager_t * sm,
  64                                svm_fifo_segment_private_t * seg)
  65 {
  66   return (seg - sm->segments);
  67 }
  68
  69 /**
  70  * Remove segment without lock
  71  */
  72 void
  73 segment_manager_del_segment (segment_manager_t * sm,
  74                              svm_fifo_segment_private_t * fs)
  75 {
  76   segment_manager_main_t *smm = &segment_manager_main;
  77
  78   if (ssvm_type (&fs->ssvm) != SSVM_SEGMENT_PRIVATE)
  79     clib_valloc_free (&smm->va_allocator, fs->ssvm.requested_va);
  80
  81   ssvm_delete (&fs->ssvm);
  82
  83   if (CLIB_DEBUG)
  84     memset (fs, 0xfb, sizeof (*fs));
  85   pool_put (sm->segments, fs);
  86 }
  87
  88 /**
  89  * Removes segment after acquiring writer lock
  90  */
  91 always_inline void
  92 segment_manager_lock_and_del_segment (segment_manager_t * sm, u32 fs_index)
  93 {
  94   svm_fifo_segment_private_t *fs;
  95   u8 is_prealloc;
  96
  97   clib_rwlock_writer_lock (&sm->segments_rwlock);
  98   fs = segment_manager_get_segment (sm, fs_index);
  99   is_prealloc = svm_fifo_segment_flags (fs) & FIFO_SEGMENT_F_IS_PREALLOCATED;
 100   if (is_prealloc && !segment_manager_app_detached (sm))
 101     {
 102       clib_rwlock_writer_unlock (&sm->segments_rwlock);
 103       return;
 104     }
 105
 106   segment_manager_del_segment (sm, fs);
 107   clib_rwlock_writer_unlock (&sm->segments_rwlock);
 108 }
 109
 110 /**
 111  * Reads a segment from the segment manager's pool without lock
 112  */
 113 svm_fifo_segment_private_t *
 114 segment_manager_get_segment (segment_manager_t * sm, u32 segment_index)
 115 {
 116   return pool_elt_at_index (sm->segments, segment_index);
 117 }
 118
 119 /**
 120  * Reads a segment from the segment manager's pool and acquires reader lock
 121  *
 122  * Caller must drop the reader's lock by calling
 123  * @ref segment_manager_segment_reader_unlock once it finishes working with
 124  * the segment.
 125  */
 126 svm_fifo_segment_private_t *
 127 segment_manager_get_segment_w_lock (segment_manager_t * sm, u32 segment_index)
 128 {
 129   clib_rwlock_reader_lock (&sm->segments_rwlock);
 130   return pool_elt_at_index (sm->segments, segment_index);
 131 }
 132
 133 void
 134 segment_manager_segment_reader_unlock (segment_manager_t * sm)
 135 {
 136   ASSERT (sm->segments_rwlock->n_readers > 0);
 137   clib_rwlock_reader_unlock (&sm->segments_rwlock);
 138 }
 139
 140 void
 141 segment_manager_segment_writer_unlock (segment_manager_t * sm)
 142 {
 143   clib_rwlock_writer_unlock (&sm->segments_rwlock);
 144 }
 145
 146 /**
 147  * Adds segment to segment manager's pool
 148  *
 149  * If needed a writer's lock is acquired before allocating a new segment
 150  * to avoid affecting any of the segments pool readers.
 151  */
 152 int
 153 segment_manager_add_segment (segment_manager_t * sm, u32 segment_size)
 154 {
 155   segment_manager_main_t *smm = &segment_manager_main;
 156   u32 rnd_margin = 128 << 10, seg_index, page_size;
 157   segment_manager_properties_t *props;
 158   uword baseva = (u64) ~ 0, alloc_size;
 159   svm_fifo_segment_private_t *seg;
 160   u8 *seg_name;
 161   int rv;
 162
 163   props = segment_manager_properties_get (sm);
 164
 165   /* Not configured for addition of new segments and not first */
 166   if (!props->add_segment && !segment_size)
 167     {
 168       clib_warning ("cannot allocate new segment");
 169       return VNET_API_ERROR_INVALID_VALUE;
 170     }
 171
 172   /*
 173    * Allocate fifo segment and lock if needed
 174    */
 175   if (vlib_num_workers ())
 176     {
 177       clib_rwlock_writer_lock (&sm->segments_rwlock);
 178       pool_get (sm->segments, seg);
 179     }
 180   else
 181     {
 182       pool_get (sm->segments, seg);
 183     }
 184   memset (seg, 0, sizeof (*seg));
 185
 186   /*
 187    * Initialize ssvm segment and svm fifo private header
 188    */
 189   segment_size = segment_size ? segment_size : props->add_segment_size;
 190   page_size = clib_mem_get_page_size ();
 191   segment_size = (segment_size + page_size - 1) & ~(page_size - 1);
 192   if (props->segment_type != SSVM_SEGMENT_PRIVATE)
 193     {
 194       seg_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
 195       alloc_size = segment_size + rnd_margin;
 196       baseva = clib_valloc_alloc (&smm->va_allocator, alloc_size, 0);
 197       if (!baseva)
 198         {
 199           clib_warning ("out of space for segments");
 200           return -1;
 201         }
 202     }
 203   else
 204     seg_name = format (0, "%s%c", "process-private-segment", 0);
 205
 206   seg->ssvm.ssvm_size = segment_size;
 207   seg->ssvm.name = seg_name;
 208   seg->ssvm.requested_va = baseva;
 209
 210   if ((rv = ssvm_master_init (&seg->ssvm, props->segment_type)))
 211     {
 212       clib_warning ("svm_master_init ('%v', %u) failed", seg_name,
 213                     segment_size);
 214
 215       if (props->segment_type != SSVM_SEGMENT_PRIVATE)
 216         clib_valloc_free (&smm->va_allocator, baseva);
 217       pool_put (sm->segments, seg);
 218       return (rv);
 219     }
 220
 221   svm_fifo_segment_init (seg);
 222
 223   /*
 224    * Save segment index before dropping lock, if any held
 225    */
 226   seg_index = seg - sm->segments;
 227
 228   if (vlib_num_workers ())
 229     clib_rwlock_writer_unlock (&sm->segments_rwlock);
 230
 231   return seg_index;
 232 }
 233
 234 segment_manager_t *
 235 segment_manager_new ()
 236 {
 237   segment_manager_main_t *smm = &segment_manager_main;
 238   segment_manager_t *sm;
 239   pool_get (smm->segment_managers, sm);
 240   memset (sm, 0, sizeof (*sm));
 241   clib_rwlock_init (&sm->segments_rwlock);
 242   return sm;
 243 }
 244
 245 /**
 246  * Initializes segment manager based on options provided.
 247  * Returns error if ssvm segment(s) allocation fails.
 248  */
 249 int
 250 segment_manager_init (segment_manager_t * sm, u32 first_seg_size,
 251                       u32 prealloc_fifo_pairs)
 252 {
 253   u32 rx_fifo_size, tx_fifo_size, pair_size;
 254   u32 rx_rounded_data_size, tx_rounded_data_size;
 255   u64 approx_total_size, max_seg_size =
 256     ((u64) 1 << 32) - clib_mem_get_page_size ();
 257   segment_manager_properties_t *props;
 258   svm_fifo_segment_private_t *segment;
 259   u32 approx_segment_count;
 260   int seg_index, i;
 261
 262   props = segment_manager_properties_get (sm);
 263   first_seg_size = clib_max (first_seg_size, default_segment_size);
 264
 265   if (prealloc_fifo_pairs)
 266     {
 267       /* Figure out how many segments should be preallocated */
 268       rx_rounded_data_size = (1 << (max_log2 (props->rx_fifo_size)));
 269       tx_rounded_data_size = (1 << (max_log2 (props->tx_fifo_size)));
 270
 271       rx_fifo_size = sizeof (svm_fifo_t) + rx_rounded_data_size;
 272       tx_fifo_size = sizeof (svm_fifo_t) + tx_rounded_data_size;
 273       pair_size = rx_fifo_size + tx_fifo_size;
 274
 275       approx_total_size = (u64) prealloc_fifo_pairs *pair_size;
 276       if (first_seg_size > approx_total_size)
 277         max_seg_size = first_seg_size;
 278       approx_segment_count = (approx_total_size + (max_seg_size - 1))
 279         / max_seg_size;
 280
 281       /* Allocate the segments */
 282       for (i = 0; i < approx_segment_count + 1; i++)
 283         {
 284           seg_index = segment_manager_add_segment (sm, max_seg_size);
 285           if (seg_index < 0)
 286             {
 287               clib_warning ("Failed to preallocate segment %d", i);
 288               return seg_index;
 289             }
 290
 291           segment = segment_manager_get_segment (sm, seg_index);
 292           if (i == 0)
 293             sm->event_queue = segment_manager_alloc_queue (segment,
 294                                                            props->evt_q_size);
 295
 296           svm_fifo_segment_preallocate_fifo_pairs (segment,
 297                                                    props->rx_fifo_size,
 298                                                    props->tx_fifo_size,
 299                                                    &prealloc_fifo_pairs);
 300           svm_fifo_segment_flags (segment) = FIFO_SEGMENT_F_IS_PREALLOCATED;
 301           if (prealloc_fifo_pairs == 0)
 302             break;
 303         }
 304     }
 305   else
 306     {
 307       seg_index = segment_manager_add_segment (sm, first_seg_size);
 308       if (seg_index)
 309         {
 310           clib_warning ("Failed to allocate segment");
 311           return seg_index;
 312         }
 313       segment = segment_manager_get_segment (sm, seg_index);
 314       sm->event_queue = segment_manager_alloc_queue (segment,
 315                                                      props->evt_q_size);
 316     }
 317
 318   return 0;
 319 }
 320
 321 u8
 322 segment_manager_has_fifos (segment_manager_t * sm)
 323 {
 324   svm_fifo_segment_private_t *seg;
 325   u8 first = 1;
 326
 327   /* *INDENT-OFF* */
 328   segment_manager_foreach_segment_w_lock (seg, sm, ({
 329     if (CLIB_DEBUG && !first && !svm_fifo_segment_has_fifos (seg)
 330         && !(svm_fifo_segment_flags (seg) & FIFO_SEGMENT_F_IS_PREALLOCATED))
 331       {
 332         clib_warning ("segment %d has no fifos!",
 333                       segment_manager_segment_index (sm, seg));
 334         first = 0;
 335       }
 336     if (svm_fifo_segment_has_fifos (seg))
 337       {
 338         segment_manager_segment_reader_unlock (sm);
 339         return 1;
 340       }
 341   }));
 342   /* *INDENT-ON* */
 343
 344   return 0;
 345 }
 346
 347 /**
 348  * Initiate disconnects for all sessions 'owned' by a segment manager
 349  */
 350 void
 351 segment_manager_del_sessions (segment_manager_t * sm)
 352 {
 353   svm_fifo_segment_private_t *fifo_segment;
 354   stream_session_t *session;
 355   svm_fifo_t *fifo;
 356
 357   ASSERT (pool_elts (sm->segments) != 0);
 358
 359   /* Across all fifo segments used by the server */
 360   /* *INDENT-OFF* */
 361   segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
 362     fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
 363
 364     /*
 365      * Remove any residual sessions from the session lookup table
 366      * Don't bother deleting the individual fifos, we're going to
 367      * throw away the fifo segment in a minute.
 368      */
 369     while (fifo)
 370       {
 371         if (fifo->master_thread_index == 255)
 372           {
 373             svm_fifo_t *next = fifo->next;
 374             application_local_session_disconnect_w_index (sm->app_index,
 375                                                           fifo->master_session_index);
 376             fifo = next;
 377             continue;
 378           }
 379         session = session_get (fifo->master_session_index,
 380                                fifo->master_thread_index);
 381         stream_session_disconnect (session);
 382         fifo = fifo->next;
 383       }
 384
 385     /* Instead of removing the segment, test when cleaning up disconnected
 386      * sessions if the segment can be removed.
 387      */
 388   }));
 389   /* *INDENT-ON* */
 390 }
 391
 392 /**
 393  * Removes segment manager.
 394  *
 395  * Since the fifos allocated in the segment keep backpointers to the sessions
 396  * prior to removing the segment, we call session disconnect. This
 397  * subsequently propagates into transport.
 398  */
 399 void
 400 segment_manager_del (segment_manager_t * sm)
 401 {
 402   segment_manager_main_t *smm = &segment_manager_main;
 403   svm_fifo_segment_private_t *fifo_segment;
 404
 405   ASSERT (!segment_manager_has_fifos (sm)
 406           && segment_manager_app_detached (sm));
 407
 408   /* If we have empty preallocated segments that haven't been removed, remove
 409    * them now. Apart from that, the first segment in the first segment manager
 410    * is not removed when all fifos are removed. It can only be removed when
 411    * the manager is explicitly deleted/detached by the app. */
 412   clib_rwlock_writer_lock (&sm->segments_rwlock);
 413
 414   /* *INDENT-OFF* */
 415   pool_foreach (fifo_segment, sm->segments, ({
 416     segment_manager_del_segment (sm, fifo_segment);
 417   }));
 418   /* *INDENT-ON* */
 419
 420   clib_rwlock_writer_unlock (&sm->segments_rwlock);
 421
 422   clib_rwlock_free (&sm->segments_rwlock);
 423   if (CLIB_DEBUG)
 424     memset (sm, 0xfe, sizeof (*sm));
 425   pool_put (smm->segment_managers, sm);
 426 }
 427
 428 void
 429 segment_manager_init_del (segment_manager_t * sm)
 430 {
 431   segment_manager_app_detach (sm);
 432   if (segment_manager_has_fifos (sm))
 433     segment_manager_del_sessions (sm);
 434   else
 435     {
 436       ASSERT (!sm->first_is_protected || segment_manager_app_detached (sm));
 437       segment_manager_del (sm);
 438     }
 439 }
 440
 441 int
 442 segment_manager_try_alloc_fifos (svm_fifo_segment_private_t * fifo_segment,
 443                                  u32 rx_fifo_size, u32 tx_fifo_size,
 444                                  svm_fifo_t ** rx_fifo, svm_fifo_t ** tx_fifo)
 445 {
 446   rx_fifo_size = clib_max (rx_fifo_size, default_fifo_size);
 447   *rx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, rx_fifo_size,
 448                                           FIFO_SEGMENT_RX_FREELIST);
 449
 450   tx_fifo_size = clib_max (tx_fifo_size, default_fifo_size);
 451   *tx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, tx_fifo_size,
 452                                           FIFO_SEGMENT_TX_FREELIST);
 453
 454   if (*rx_fifo == 0)
 455     {
 456       /* This would be very odd, but handle it... */
 457       if (*tx_fifo != 0)
 458         {
 459           svm_fifo_segment_free_fifo (fifo_segment, *tx_fifo,
 460                                       FIFO_SEGMENT_TX_FREELIST);
 461           *tx_fifo = 0;
 462         }
 463       return -1;
 464     }
 465   if (*tx_fifo == 0)
 466     {
 467       if (*rx_fifo != 0)
 468         {
 469           svm_fifo_segment_free_fifo (fifo_segment, *rx_fifo,
 470                                       FIFO_SEGMENT_RX_FREELIST);
 471           *rx_fifo = 0;
 472         }
 473       return -1;
 474     }
 475
 476   return 0;
 477 }
 478
 479 int
 480 segment_manager_alloc_session_fifos (segment_manager_t * sm,
 481                                      svm_fifo_t ** rx_fifo,
 482                                      svm_fifo_t ** tx_fifo,
 483                                      u32 * fifo_segment_index)
 484 {
 485   svm_fifo_segment_private_t *fifo_segment = 0;
 486   int alloc_fail = 1, rv = 0, new_fs_index;
 487   segment_manager_properties_t *props;
 488   u8 added_a_segment = 0;
 489   u32 sm_index;
 490
 491   props = segment_manager_properties_get (sm);
 492
 493   /*
 494    * Find the first free segment to allocate the fifos in
 495    */
 496
 497   /* *INDENT-OFF* */
 498   segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
 499     alloc_fail = segment_manager_try_alloc_fifos (fifo_segment,
 500                                                   props->rx_fifo_size,
 501                                                   props->tx_fifo_size,
 502                                                   rx_fifo, tx_fifo);
 503     /* Exit with lock held, drop it after notifying app */
 504     if (!alloc_fail)
 505       goto alloc_success;
 506   }));
 507   /* *INDENT-ON* */
 508
 509 alloc_check:
 510
 511   if (!alloc_fail)
 512     {
 513
 514     alloc_success:
 515
 516       ASSERT (rx_fifo && tx_fifo);
 517       sm_index = segment_manager_index (sm);
 518       (*tx_fifo)->segment_manager = sm_index;
 519       (*rx_fifo)->segment_manager = sm_index;
 520       *fifo_segment_index = segment_manager_segment_index (sm, fifo_segment);
 521
 522       if (added_a_segment)
 523         rv = application_add_segment_notify (sm->app_index,
 524                                              &fifo_segment->ssvm);
 525       /* Drop the lock after app is notified */
 526       segment_manager_segment_reader_unlock (sm);
 527       return rv;
 528     }
 529
 530   /*
 531    * Allocation failed, see if we can add a new segment
 532    */
 533   if (props->add_segment)
 534     {
 535       if (added_a_segment)
 536         {
 537           clib_warning ("Added a segment, still can't allocate a fifo");
 538           segment_manager_segment_reader_unlock (sm);
 539           return SESSION_ERROR_NEW_SEG_NO_SPACE;
 540         }
 541       if ((new_fs_index = segment_manager_add_segment (sm, 0)) < 0)
 542         {
 543           clib_warning ("Failed to add new segment");
 544           return SESSION_ERROR_SEG_CREATE;
 545         }
 546       fifo_segment = segment_manager_get_segment_w_lock (sm, new_fs_index);
 547       alloc_fail = segment_manager_try_alloc_fifos (fifo_segment,
 548                                                     props->rx_fifo_size,
 549                                                     props->tx_fifo_size,
 550                                                     rx_fifo, tx_fifo);
 551       added_a_segment = 1;
 552       goto alloc_check;
 553     }
 554   else
 555     {
 556       clib_warning ("Can't add new seg and no space to allocate fifos!");
 557       return SESSION_ERROR_NO_SPACE;
 558     }
 559 }
 560
 561 void
 562 segment_manager_dealloc_fifos (u32 segment_index, svm_fifo_t * rx_fifo,
 563                                svm_fifo_t * tx_fifo)
 564 {
 565   svm_fifo_segment_private_t *fifo_segment;
 566   segment_manager_t *sm;
 567
 568   /* It's possible to have no segment manager if the session was removed
 569    * as result of a detach. */
 570   if (!(sm = segment_manager_get_if_valid (rx_fifo->segment_manager)))
 571     return;
 572
 573   fifo_segment = segment_manager_get_segment_w_lock (sm, segment_index);
 574   svm_fifo_segment_free_fifo (fifo_segment, rx_fifo,
 575                               FIFO_SEGMENT_RX_FREELIST);
 576   svm_fifo_segment_free_fifo (fifo_segment, tx_fifo,
 577                               FIFO_SEGMENT_TX_FREELIST);
 578
 579   /*
 580    * Try to remove svm segment if it has no fifos. This can be done only if
 581    * the segment is not the first in the segment manager or if it is first
 582    * and it is not protected. Moreover, if the segment is first and the app
 583    * has detached from the segment manager, remove the segment manager.
 584    */
 585   if (!svm_fifo_segment_has_fifos (fifo_segment))
 586     {
 587       segment_manager_segment_reader_unlock (sm);
 588
 589       /* Remove segment if it holds no fifos or first but not protected */
 590       if (segment_index != 0 || !sm->first_is_protected)
 591         segment_manager_lock_and_del_segment (sm, segment_index);
 592
 593       /* Remove segment manager if no sessions and detached from app */
 594       if (segment_manager_app_detached (sm)
 595           && !segment_manager_has_fifos (sm))
 596         segment_manager_del (sm);
 597     }
 598   else
 599     segment_manager_segment_reader_unlock (sm);
 600 }
 601
 602 /**
 603  * Allocates shm queue in the first segment
 604  *
 605  * Must be called with lock held
 606  */
 607 svm_queue_t *
 608 segment_manager_alloc_queue (svm_fifo_segment_private_t * segment,
 609                              u32 queue_size)
 610 {
 611   ssvm_shared_header_t *sh;
 612   svm_queue_t *q;
 613   void *oldheap;
 614
 615   sh = segment->ssvm.sh;
 616
 617   oldheap = ssvm_push_heap (sh);
 618   q = svm_queue_init (queue_size, sizeof (session_fifo_event_t),
 619                       0 /* consumer pid */ ,
 620                       0 /* signal when queue non-empty */ );
 621   ssvm_pop_heap (oldheap);
 622   return q;
 623 }
 624
 625 /**
 626  * Frees shm queue allocated in the first segment
 627  */
 628 void
 629 segment_manager_dealloc_queue (segment_manager_t * sm, svm_queue_t * q)
 630 {
 631   svm_fifo_segment_private_t *segment;
 632   ssvm_shared_header_t *sh;
 633   void *oldheap;
 634
 635   ASSERT (!pool_is_free_index (sm->segments, 0));
 636
 637   segment = segment_manager_get_segment_w_lock (sm, 0);
 638   sh = segment->ssvm.sh;
 639
 640   oldheap = ssvm_push_heap (sh);
 641   svm_queue_free (q);
 642   ssvm_pop_heap (oldheap);
 643   segment_manager_segment_reader_unlock (sm);
 644 }
 645
 646 /*
 647  * Init segment vm address allocator
 648  */
 649 void
 650 segment_manager_main_init (segment_manager_main_init_args_t * a)
 651 {
 652   segment_manager_main_t *sm = &segment_manager_main;
 653   clib_valloc_chunk_t _ip, *ip = &_ip;
 654
 655   ip->baseva = a->baseva;
 656   ip->size = a->size;
 657
 658   clib_valloc_init (&sm->va_allocator, ip, 1 /* lock */ );
 659 }
 660
 661 static clib_error_t *
 662 segment_manager_show_fn (vlib_main_t * vm, unformat_input_t * input,
 663                          vlib_cli_command_t * cmd)
 664 {
 665   segment_manager_main_t *smm = &segment_manager_main;
 666   svm_fifo_segment_private_t *seg;
 667   segment_manager_t *sm;
 668   u8 show_segments = 0, verbose = 0;
 669   uword address;
 670   u64 size;
 671   u32 active_fifos;
 672   u32 free_fifos;
 673
 674   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 675     {
 676       if (unformat (input, "segments"))
 677         show_segments = 1;
 678       else if (unformat (input, "verbose"))
 679         verbose = 1;
 680       else
 681         return clib_error_return (0, "unknown input `%U'",
 682                                   format_unformat_error, input);
 683     }
 684   vlib_cli_output (vm, "%d segment managers allocated",
 685                    pool_elts (smm->segment_managers));
 686   if (verbose && pool_elts (smm->segment_managers))
 687     {
 688       vlib_cli_output (vm, "%-10s%=15s%=12s", "Index", "App Index",
 689                        "Segments");
 690
 691       /* *INDENT-OFF* */
 692       pool_foreach (sm, smm->segment_managers, ({
 693         vlib_cli_output (vm, "%-10d%=15d%=12d", segment_manager_index(sm),
 694                            sm->app_index, pool_elts (sm->segments));
 695       }));
 696       /* *INDENT-ON* */
 697
 698     }
 699   if (show_segments)
 700     {
 701       vlib_cli_output (vm, "%-15s%15s%15s%15s%15s%15s", "Name", "Type",
 702                        "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
 703
 704       /* *INDENT-OFF* */
 705       pool_foreach (sm, smm->segment_managers, ({
 706           segment_manager_foreach_segment_w_lock (seg, sm, ({
 707             svm_fifo_segment_info (seg, &address, &size);
 708             active_fifos = svm_fifo_segment_num_fifos (seg);
 709             free_fifos = svm_fifo_segment_num_free_fifos (seg, ~0 /* size */);
 710             vlib_cli_output (vm, "%-15v%15U%15llu%15u%15u%15llx",
 711                              ssvm_name (&seg->ssvm), format_svm_fifo_segment_type,
 712                              seg, size >> 20ULL, active_fifos, free_fifos,
 713                              address);
 714             if (verbose)
 715               vlib_cli_output (vm, "%U", format_svm_fifo_segment, seg, verbose);
 716           }));
 717       }));
 718       /* *INDENT-ON* */
 719
 720     }
 721   return 0;
 722 }
 723
 724 /* *INDENT-OFF* */
 725 VLIB_CLI_COMMAND (segment_manager_show_command, static) =
 726 {
 727   .path = "show segment-manager",
 728   .short_help = "show segment-manager [segments][verbose]",
 729   .function = segment_manager_show_fn,
 730 };
 731 /* *INDENT-ON* */
 732
 733 /*
 734  * fd.io coding-style-patch-verification: ON
 735  *
 736  * Local Variables:
 737  * eval: (c-set-style "gnu")
 738  * End:
 739  */