2 * Copyright (c) 2017-2019 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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 #include <vnet/session/segment_manager.h>
17 #include <vnet/session/session.h>
18 #include <vnet/session/application.h>
20 typedef struct segment_manager_main_
22 segment_manager_t *segment_managers; /**< Pool of segment managers */
23 clib_valloc_main_t va_allocator; /**< Virtual address allocator */
24 u32 seg_name_counter; /**< Counter for segment names */
29 u32 default_fifo_size; /**< default rx/tx fifo size */
30 u32 default_segment_size; /**< default fifo segment size */
31 u32 default_app_mq_size; /**< default app msg q size */
32 } segment_manager_main_t;
34 static segment_manager_main_t sm_main;
36 #define segment_manager_foreach_segment_w_lock(VAR, SM, BODY) \
38 clib_rwlock_reader_lock (&(SM)->segments_rwlock); \
39 pool_foreach((VAR), ((SM)->segments), (BODY)); \
40 clib_rwlock_reader_unlock (&(SM)->segments_rwlock); \
43 static segment_manager_props_t *
44 segment_manager_properties_get (segment_manager_t * sm)
46 app_worker_t *app_wrk = app_worker_get (sm->app_wrk_index);
47 return application_get_segment_manager_properties (app_wrk->app_index);
50 segment_manager_props_t *
51 segment_manager_props_init (segment_manager_props_t * props)
53 props->add_segment_size = sm_main.default_segment_size;
54 props->rx_fifo_size = sm_main.default_fifo_size;
55 props->tx_fifo_size = sm_main.default_fifo_size;
56 props->evt_q_size = sm_main.default_app_mq_size;
61 segment_manager_app_detached (segment_manager_t * sm)
63 return (sm->app_wrk_index == SEGMENT_MANAGER_INVALID_APP_INDEX);
67 segment_manager_app_detach (segment_manager_t * sm)
69 sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
73 segment_manager_segment_index (segment_manager_t * sm, fifo_segment_t * seg)
75 return (seg - sm->segments);
79 * Adds segment to segment manager's pool
81 * If needed a writer's lock is acquired before allocating a new segment
82 * to avoid affecting any of the segments pool readers.
85 segment_manager_add_segment (segment_manager_t * sm, u32 segment_size)
87 segment_manager_main_t *smm = &sm_main;
88 u32 rnd_margin = 128 << 10, fs_index = ~0, page_size;
89 uword baseva = (uword) ~ 0ULL, alloc_size;
90 segment_manager_props_t *props;
95 props = segment_manager_properties_get (sm);
97 /* Not configured for addition of new segments and not first */
98 if (!props->add_segment && !segment_size)
100 clib_warning ("cannot allocate new segment");
101 return VNET_API_ERROR_INVALID_VALUE;
105 * Allocate fifo segment and grab lock if needed
107 if (vlib_num_workers ())
108 clib_rwlock_writer_lock (&sm->segments_rwlock);
110 pool_get_zero (sm->segments, fs);
113 * Allocate ssvm segment
115 segment_size = segment_size ? segment_size : props->add_segment_size;
116 page_size = clib_mem_get_page_size ();
117 /* Protect against segment size u32 wrap */
118 segment_size = clib_max (segment_size + page_size - 1, segment_size);
119 segment_size = segment_size & ~(page_size - 1);
121 if (props->segment_type != SSVM_SEGMENT_PRIVATE)
123 seg_name = format (0, "%d-%d%c", getpid (), smm->seg_name_counter++, 0);
124 alloc_size = (uword) segment_size + rnd_margin;
125 baseva = clib_valloc_alloc (&smm->va_allocator, alloc_size, 0);
128 clib_warning ("out of space for segments");
129 pool_put (sm->segments, fs);
134 seg_name = format (0, "%s%c", "process-private", 0);
136 fs->ssvm.ssvm_size = segment_size;
137 fs->ssvm.name = seg_name;
138 fs->ssvm.requested_va = baseva;
140 if ((rv = ssvm_master_init (&fs->ssvm, props->segment_type)))
142 clib_warning ("svm_master_init ('%v', %u) failed", seg_name,
145 if (props->segment_type != SSVM_SEGMENT_PRIVATE)
146 clib_valloc_free (&smm->va_allocator, baseva);
147 pool_put (sm->segments, fs);
152 * Initialize fifo segment
154 fifo_segment_init (fs);
157 * Save segment index before dropping lock, if any held
159 fs_index = fs - sm->segments;
163 if (vlib_num_workers ())
164 clib_rwlock_writer_unlock (&sm->segments_rwlock);
170 * Remove segment without lock
173 segment_manager_del_segment (segment_manager_t * sm, fifo_segment_t * fs)
175 segment_manager_main_t *smm = &sm_main;
177 if (ssvm_type (&fs->ssvm) != SSVM_SEGMENT_PRIVATE)
179 clib_valloc_free (&smm->va_allocator, fs->ssvm.requested_va);
181 if (sm->app_wrk_index != SEGMENT_MANAGER_INVALID_APP_INDEX)
183 app_worker_t *app_wrk;
185 app_wrk = app_worker_get (sm->app_wrk_index);
186 segment_handle = segment_manager_segment_handle (sm, fs);
187 app_worker_del_segment_notify (app_wrk, segment_handle);
191 ssvm_delete (&fs->ssvm);
194 clib_memset (fs, 0xfb, sizeof (*fs));
195 pool_put (sm->segments, fs);
199 * Removes segment after acquiring writer lock
202 segment_manager_lock_and_del_segment (segment_manager_t * sm, u32 fs_index)
207 clib_rwlock_writer_lock (&sm->segments_rwlock);
208 fs = segment_manager_get_segment (sm, fs_index);
209 is_prealloc = fifo_segment_flags (fs) & FIFO_SEGMENT_F_IS_PREALLOCATED;
210 if (is_prealloc && !segment_manager_app_detached (sm))
212 clib_rwlock_writer_unlock (&sm->segments_rwlock);
216 segment_manager_del_segment (sm, fs);
217 clib_rwlock_writer_unlock (&sm->segments_rwlock);
221 * Reads a segment from the segment manager's pool without lock
224 segment_manager_get_segment (segment_manager_t * sm, u32 segment_index)
226 return pool_elt_at_index (sm->segments, segment_index);
230 segment_manager_segment_handle (segment_manager_t * sm,
231 fifo_segment_t * segment)
233 u32 segment_index = segment_manager_segment_index (sm, segment);
234 return (((u64) segment_manager_index (sm) << 32) | segment_index);
238 segment_manager_parse_segment_handle (u64 segment_handle, u32 * sm_index,
241 *sm_index = segment_handle >> 32;
242 *segment_index = segment_handle & 0xFFFFFFFF;
246 segment_manager_make_segment_handle (u32 segment_manager_index,
249 return (((u64) segment_manager_index << 32) | segment_index);
253 segment_manager_get_segment_w_handle (u64 segment_handle)
255 u32 sm_index, segment_index;
256 segment_manager_t *sm;
258 segment_manager_parse_segment_handle (segment_handle, &sm_index,
260 sm = segment_manager_get (sm_index);
261 if (!sm || pool_is_free_index (sm->segments, segment_index))
263 return pool_elt_at_index (sm->segments, segment_index);
267 * Reads a segment from the segment manager's pool and acquires reader lock
269 * Caller must drop the reader's lock by calling
270 * @ref segment_manager_segment_reader_unlock once it finishes working with
274 segment_manager_get_segment_w_lock (segment_manager_t * sm, u32 segment_index)
276 clib_rwlock_reader_lock (&sm->segments_rwlock);
277 return pool_elt_at_index (sm->segments, segment_index);
281 segment_manager_segment_reader_unlock (segment_manager_t * sm)
283 clib_rwlock_reader_unlock (&sm->segments_rwlock);
287 segment_manager_segment_writer_unlock (segment_manager_t * sm)
289 clib_rwlock_writer_unlock (&sm->segments_rwlock);
293 segment_manager_alloc (void)
295 segment_manager_main_t *smm = &sm_main;
296 segment_manager_t *sm;
298 pool_get_zero (smm->segment_managers, sm);
299 clib_rwlock_init (&sm->segments_rwlock);
304 * Initializes segment manager based on options provided.
305 * Returns error if ssvm segment(s) allocation fails.
308 segment_manager_init (segment_manager_t * sm, u32 first_seg_size,
309 u32 prealloc_fifo_pairs)
311 u32 rx_fifo_size, tx_fifo_size, pair_size;
312 u32 rx_rounded_data_size, tx_rounded_data_size;
313 u64 approx_total_size, max_seg_size = ((u64) 1 << 32) - (128 << 10);
314 segment_manager_props_t *props;
315 fifo_segment_t *segment;
316 u32 approx_segment_count;
319 props = segment_manager_properties_get (sm);
320 first_seg_size = clib_max (first_seg_size, sm_main.default_segment_size);
322 if (prealloc_fifo_pairs)
324 /* Figure out how many segments should be preallocated */
325 rx_rounded_data_size = (1 << (max_log2 (props->rx_fifo_size)));
326 tx_rounded_data_size = (1 << (max_log2 (props->tx_fifo_size)));
328 rx_fifo_size = sizeof (svm_fifo_t) + rx_rounded_data_size;
329 tx_fifo_size = sizeof (svm_fifo_t) + tx_rounded_data_size;
330 pair_size = rx_fifo_size + tx_fifo_size;
332 approx_total_size = (u64) prealloc_fifo_pairs *pair_size;
333 if (first_seg_size > approx_total_size)
334 max_seg_size = first_seg_size;
335 approx_segment_count = (approx_total_size + (max_seg_size - 1))
338 /* Allocate the segments */
339 for (i = 0; i < approx_segment_count + 1; i++)
341 seg_index = segment_manager_add_segment (sm, max_seg_size);
344 clib_warning ("Failed to preallocate segment %d", i);
348 segment = segment_manager_get_segment (sm, seg_index);
350 sm->event_queue = segment_manager_alloc_queue (segment, props);
352 fifo_segment_preallocate_fifo_pairs (segment,
355 &prealloc_fifo_pairs);
356 fifo_segment_flags (segment) = FIFO_SEGMENT_F_IS_PREALLOCATED;
357 if (prealloc_fifo_pairs == 0)
363 seg_index = segment_manager_add_segment (sm, first_seg_size);
366 clib_warning ("Failed to allocate segment");
369 segment = segment_manager_get_segment (sm, seg_index);
370 sm->event_queue = segment_manager_alloc_queue (segment, props);
377 * Cleanup segment manager.
380 segment_manager_free (segment_manager_t * sm)
382 segment_manager_main_t *smm = &sm_main;
383 fifo_segment_t *fifo_segment;
385 ASSERT (!segment_manager_has_fifos (sm)
386 && segment_manager_app_detached (sm));
388 /* If we have empty preallocated segments that haven't been removed, remove
389 * them now. Apart from that, the first segment in the first segment manager
390 * is not removed when all fifos are removed. It can only be removed when
391 * the manager is explicitly deleted/detached by the app. */
392 clib_rwlock_writer_lock (&sm->segments_rwlock);
395 pool_foreach (fifo_segment, sm->segments, ({
396 segment_manager_del_segment (sm, fifo_segment);
400 clib_rwlock_writer_unlock (&sm->segments_rwlock);
402 clib_rwlock_free (&sm->segments_rwlock);
404 clib_memset (sm, 0xfe, sizeof (*sm));
405 pool_put (smm->segment_managers, sm);
409 segment_manager_init_free (segment_manager_t * sm)
411 segment_manager_app_detach (sm);
412 if (segment_manager_has_fifos (sm))
413 segment_manager_del_sessions (sm);
416 ASSERT (!sm->first_is_protected || segment_manager_app_detached (sm));
417 segment_manager_free (sm);
422 segment_manager_get (u32 index)
424 return pool_elt_at_index (sm_main.segment_managers, index);
428 segment_manager_get_if_valid (u32 index)
430 if (pool_is_free_index (sm_main.segment_managers, index))
432 return pool_elt_at_index (sm_main.segment_managers, index);
436 segment_manager_index (segment_manager_t * sm)
438 return sm - sm_main.segment_managers;
442 segment_manager_has_fifos (segment_manager_t * sm)
448 segment_manager_foreach_segment_w_lock (seg, sm, ({
449 if (CLIB_DEBUG && !first && !fifo_segment_has_fifos (seg)
450 && !(fifo_segment_flags (seg) & FIFO_SEGMENT_F_IS_PREALLOCATED))
452 clib_warning ("segment %d has no fifos!",
453 segment_manager_segment_index (sm, seg));
456 if (fifo_segment_has_fifos (seg))
458 segment_manager_segment_reader_unlock (sm);
468 * Initiate disconnects for all sessions 'owned' by a segment manager
471 segment_manager_del_sessions (segment_manager_t * sm)
473 fifo_segment_t *fifo_segment;
474 session_handle_t *handles = 0, *handle;
478 ASSERT (pool_elts (sm->segments) != 0);
480 /* Across all fifo segments used by the server */
482 segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
483 fifo = fifo_segment_get_fifo_list (fifo_segment);
486 * Remove any residual sessions from the session lookup table
487 * Don't bother deleting the individual fifos, we're going to
488 * throw away the fifo segment in a minute.
492 session = session_get_if_valid (fifo->master_session_index,
493 fifo->master_thread_index);
495 vec_add1 (handles, session_handle (session));
499 /* Instead of removing the segment, test when cleaning up disconnected
500 * sessions if the segment can be removed.
505 vec_foreach (handle, handles)
506 session_close (session_get_from_handle (*handle));
510 segment_manager_try_alloc_fifos (fifo_segment_t * fifo_segment,
511 u32 rx_fifo_size, u32 tx_fifo_size,
512 svm_fifo_t ** rx_fifo, svm_fifo_t ** tx_fifo)
514 rx_fifo_size = clib_max (rx_fifo_size, sm_main.default_fifo_size);
515 *rx_fifo = fifo_segment_alloc_fifo (fifo_segment, rx_fifo_size,
516 FIFO_SEGMENT_RX_FIFO);
518 tx_fifo_size = clib_max (tx_fifo_size, sm_main.default_fifo_size);
519 *tx_fifo = fifo_segment_alloc_fifo (fifo_segment, tx_fifo_size,
520 FIFO_SEGMENT_TX_FIFO);
524 /* This would be very odd, but handle it... */
527 fifo_segment_free_fifo (fifo_segment, *tx_fifo);
536 fifo_segment_free_fifo (fifo_segment, *rx_fifo);
546 segment_manager_alloc_session_fifos (segment_manager_t * sm,
547 svm_fifo_t ** rx_fifo,
548 svm_fifo_t ** tx_fifo)
550 int alloc_fail = 1, rv = 0, new_fs_index;
551 segment_manager_props_t *props;
552 fifo_segment_t *fs = 0;
553 u32 sm_index, fs_index;
554 u8 added_a_segment = 0;
557 props = segment_manager_properties_get (sm);
560 * Find the first free segment to allocate the fifos in
564 segment_manager_foreach_segment_w_lock (fs, sm, ({
565 alloc_fail = segment_manager_try_alloc_fifos (fs,
569 /* Exit with lock held, drop it after notifying app */
582 ASSERT (rx_fifo && tx_fifo);
583 sm_index = segment_manager_index (sm);
584 fs_index = segment_manager_segment_index (sm, fs);
585 (*tx_fifo)->segment_manager = sm_index;
586 (*rx_fifo)->segment_manager = sm_index;
587 (*tx_fifo)->segment_index = fs_index;
588 (*rx_fifo)->segment_index = fs_index;
592 app_worker_t *app_wrk;
593 fs_handle = segment_manager_segment_handle (sm, fs);
594 app_wrk = app_worker_get (sm->app_wrk_index);
595 rv = app_worker_add_segment_notify (app_wrk, fs_handle);
597 /* Drop the lock after app is notified */
598 segment_manager_segment_reader_unlock (sm);
603 * Allocation failed, see if we can add a new segment
605 if (props->add_segment)
609 clib_warning ("Added a segment, still can't allocate a fifo");
610 segment_manager_segment_reader_unlock (sm);
611 return SESSION_ERROR_NEW_SEG_NO_SPACE;
613 if ((new_fs_index = segment_manager_add_segment (sm, 0)) < 0)
615 clib_warning ("Failed to add new segment");
616 return SESSION_ERROR_SEG_CREATE;
618 fs = segment_manager_get_segment_w_lock (sm, new_fs_index);
619 alloc_fail = segment_manager_try_alloc_fifos (fs, props->rx_fifo_size,
627 clib_warning ("Can't add new seg and no space to allocate fifos!");
628 return SESSION_ERROR_NO_SPACE;
633 segment_manager_dealloc_fifos (svm_fifo_t * rx_fifo, svm_fifo_t * tx_fifo)
635 segment_manager_t *sm;
639 if (!rx_fifo || !tx_fifo)
642 /* It's possible to have no segment manager if the session was removed
643 * as result of a detach. */
644 if (!(sm = segment_manager_get_if_valid (rx_fifo->segment_manager)))
647 segment_index = rx_fifo->segment_index;
648 fs = segment_manager_get_segment_w_lock (sm, segment_index);
649 fifo_segment_free_fifo (fs, rx_fifo);
650 fifo_segment_free_fifo (fs, tx_fifo);
653 * Try to remove svm segment if it has no fifos. This can be done only if
654 * the segment is not the first in the segment manager or if it is first
655 * and it is not protected. Moreover, if the segment is first and the app
656 * has detached from the segment manager, remove the segment manager.
658 if (!fifo_segment_has_fifos (fs))
660 segment_manager_segment_reader_unlock (sm);
662 /* Remove segment if it holds no fifos or first but not protected */
663 if (segment_index != 0 || !sm->first_is_protected)
664 segment_manager_lock_and_del_segment (sm, segment_index);
666 /* Remove segment manager if no sessions and detached from app */
667 if (segment_manager_app_detached (sm)
668 && !segment_manager_has_fifos (sm))
670 segment_manager_free (sm);
674 segment_manager_segment_reader_unlock (sm);
678 segment_manager_grow_fifo (segment_manager_t * sm, svm_fifo_t * f, u32 size)
683 fs = segment_manager_get_segment_w_lock (sm, f->segment_index);
684 rv = fifo_segment_grow_fifo (fs, f, size);
685 segment_manager_segment_reader_unlock (sm);
691 segment_manager_collect_fifo_chunks (segment_manager_t * sm, svm_fifo_t * f)
696 fs = segment_manager_get_segment_w_lock (sm, f->segment_index);
697 rv = fifo_segment_collect_fifo_chunks (fs, f);
698 segment_manager_segment_reader_unlock (sm);
704 segment_manager_shrink_fifo (segment_manager_t * sm, svm_fifo_t * f, u32 size,
709 rv = svm_fifo_reduce_size (f, size, is_producer);
711 /* Nothing to collect at this point */
715 if (f->flags & SVM_FIFO_F_COLLECT_CHUNKS)
716 segment_manager_collect_fifo_chunks (sm, f);
722 segment_manager_evt_q_expected_size (u32 q_len)
724 u32 fifo_evt_size, notif_q_size, q_hdrs;
725 u32 msg_q_sz, fifo_evt_ring_sz, session_ntf_ring_sz;
727 fifo_evt_size = 1 << max_log2 (sizeof (session_event_t));
728 notif_q_size = clib_max (16, q_len >> 4);
730 msg_q_sz = q_len * sizeof (svm_msg_q_msg_t);
731 fifo_evt_ring_sz = q_len * fifo_evt_size;
732 session_ntf_ring_sz = notif_q_size * 256;
733 q_hdrs = sizeof (svm_queue_t) + sizeof (svm_msg_q_t);
735 return (msg_q_sz + fifo_evt_ring_sz + session_ntf_ring_sz + q_hdrs);
739 * Allocates shm queue in the first segment
741 * Must be called with lock held
744 segment_manager_alloc_queue (fifo_segment_t * segment,
745 segment_manager_props_t * props)
747 u32 fifo_evt_size, session_evt_size = 256, notif_q_size;
748 svm_msg_q_cfg_t _cfg, *cfg = &_cfg;
752 fifo_evt_size = sizeof (session_event_t);
753 notif_q_size = clib_max (16, props->evt_q_size >> 4);
755 svm_msg_q_ring_cfg_t rc[SESSION_MQ_N_RINGS] = {
756 {props->evt_q_size, fifo_evt_size, 0},
757 {notif_q_size, session_evt_size, 0}
760 cfg->consumer_pid = 0;
762 cfg->q_nitems = props->evt_q_size;
765 oldheap = ssvm_push_heap (segment->ssvm.sh);
766 q = svm_msg_q_alloc (cfg);
767 fifo_segment_update_free_bytes (segment);
768 ssvm_pop_heap (oldheap);
770 if (props->use_mq_eventfd)
772 if (svm_msg_q_alloc_producer_eventfd (q))
773 clib_warning ("failed to alloc eventfd");
779 segment_manager_event_queue (segment_manager_t * sm)
781 return sm->event_queue;
785 * Frees shm queue allocated in the first segment
788 segment_manager_dealloc_queue (segment_manager_t * sm, svm_queue_t * q)
790 fifo_segment_t *segment;
791 ssvm_shared_header_t *sh;
794 ASSERT (!pool_is_free_index (sm->segments, 0));
796 segment = segment_manager_get_segment_w_lock (sm, 0);
797 sh = segment->ssvm.sh;
799 oldheap = ssvm_push_heap (sh);
801 ssvm_pop_heap (oldheap);
802 segment_manager_segment_reader_unlock (sm);
806 * Init segment vm address allocator
809 segment_manager_main_init (segment_manager_main_init_args_t * a)
811 segment_manager_main_t *sm = &sm_main;
812 clib_valloc_chunk_t _ip, *ip = &_ip;
814 ip->baseva = a->baseva;
817 clib_valloc_init (&sm->va_allocator, ip, 1 /* lock */ );
819 sm->default_fifo_size = 1 << 12;
820 sm->default_segment_size = 1 << 20;
821 sm->default_app_mq_size = 128;
824 static clib_error_t *
825 segment_manager_show_fn (vlib_main_t * vm, unformat_input_t * input,
826 vlib_cli_command_t * cmd)
828 segment_manager_main_t *smm = &sm_main;
829 u8 show_segments = 0, verbose = 0;
830 segment_manager_t *sm;
833 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
835 if (unformat (input, "segments"))
837 else if (unformat (input, "verbose"))
840 return clib_error_return (0, "unknown input `%U'",
841 format_unformat_error, input);
843 vlib_cli_output (vm, "%d segment managers allocated",
844 pool_elts (smm->segment_managers));
845 if (verbose && pool_elts (smm->segment_managers))
847 vlib_cli_output (vm, "%-10s%=15s%=12s", "Index", "App Index",
851 pool_foreach (sm, smm->segment_managers, ({
852 vlib_cli_output (vm, "%-10d%=15d%=12d", segment_manager_index (sm),
853 sm->app_wrk_index, pool_elts (sm->segments));
860 vlib_cli_output (vm, "%U", format_fifo_segment, 0, verbose);
863 pool_foreach (sm, smm->segment_managers, ({
864 segment_manager_foreach_segment_w_lock (seg, sm, ({
865 vlib_cli_output (vm, "%U", format_fifo_segment, seg, verbose);
875 VLIB_CLI_COMMAND (segment_manager_show_command, static) =
877 .path = "show segment-manager",
878 .short_help = "show segment-manager [segments][verbose]",
879 .function = segment_manager_show_fn,
884 segment_manager_format_sessions (segment_manager_t * sm, int verbose)
886 fifo_segment_t *fifo_segment;
887 vlib_main_t *vm = vlib_get_main ();
888 app_worker_t *app_wrk;
895 vlib_cli_output (vm, "%-40s%-20s%-15s%-10s", "Connection", "App",
896 "API Client", "SegManager");
898 vlib_cli_output (vm, "%-40s%-20s", "Connection", "App");
902 app_wrk = app_worker_get (sm->app_wrk_index);
903 app_name = application_name_from_index (app_wrk->app_index);
905 clib_rwlock_reader_lock (&sm->segments_rwlock);
908 pool_foreach (fifo_segment, sm->segments, ({
912 fifo = fifo_segment_get_fifo_list (fifo_segment);
915 u32 session_index, thread_index;
918 session_index = fifo->master_session_index;
919 thread_index = fifo->master_thread_index;
921 session = session_get (session_index, thread_index);
922 str = format (0, "%U", format_session, session, verbose);
925 s = format (s, "%-40s%-20s%-15u%-10u", str, app_name,
926 app_wrk->api_client_index, app_wrk->connects_seg_manager);
928 s = format (s, "%-40s%-20s", str, app_name);
930 vlib_cli_output (vm, "%v", s);
931 vec_reset_length (s);
940 clib_rwlock_reader_unlock (&sm->segments_rwlock);
944 * fd.io coding-style-patch-verification: ON
947 * eval: (c-set-style "gnu")