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:
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.
17 #include <vlib/vlib.h>
18 #include <vnet/vnet.h>
19 #include <vppinfra/elog.h>
20 #include <vnet/session/transport.h>
21 #include <vnet/session/application.h>
22 #include <vnet/session/session_debug.h>
23 #include <svm/queue.h>
25 vlib_node_registration_t session_queue_node;
30 u32 server_thread_index;
31 } session_queue_trace_t;
33 /* packet trace format function */
35 format_session_queue_trace (u8 * s, va_list * args)
37 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
38 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
39 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
41 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
42 t->session_index, t->server_thread_index);
46 vlib_node_registration_t session_queue_node;
48 #define foreach_session_queue_error \
49 _(TX, "Packets transmitted") \
50 _(TIMER, "Timer events") \
51 _(NO_BUFFER, "Out of buffers")
55 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
56 foreach_session_queue_error
58 SESSION_QUEUE_N_ERROR,
59 } session_queue_error_t;
61 static char *session_queue_error_strings[] = {
62 #define _(sym,string) string,
63 foreach_session_queue_error
68 session_tx_fifo_chain_tail (session_manager_main_t * smm, vlib_main_t * vm,
69 u8 thread_index, svm_fifo_t * fifo,
70 vlib_buffer_t * b0, u32 bi0, u8 n_bufs_per_seg,
71 u32 left_from_seg, u32 * left_to_snd0,
72 u16 * n_bufs, u32 * tx_offset, u16 deq_per_buf,
73 u8 peek_data, transport_tx_fn_type_t tx_type)
75 vlib_buffer_t *chain_b0, *prev_b0;
76 u32 chain_bi0, to_deq;
77 u16 len_to_deq0, n_bytes_read;
80 b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
81 b0->total_length_not_including_first_buffer = 0;
85 to_deq = left_from_seg;
86 for (j = 1; j < n_bufs_per_seg; j++)
89 len_to_deq0 = clib_min (to_deq, deq_per_buf);
92 chain_bi0 = smm->tx_buffers[thread_index][*n_bufs];
93 _vec_len (smm->tx_buffers[thread_index]) = *n_bufs;
95 chain_b0 = vlib_get_buffer (vm, chain_bi0);
96 chain_b0->current_data = 0;
97 data0 = vlib_buffer_get_current (chain_b0);
100 n_bytes_read = svm_fifo_peek (fifo, *tx_offset, len_to_deq0, data0);
101 *tx_offset += n_bytes_read;
105 if (tx_type == TRANSPORT_TX_DGRAM)
107 session_dgram_hdr_t *hdr;
109 hdr = (session_dgram_hdr_t *) svm_fifo_head (fifo);
110 deq_now = clib_min (hdr->data_length - hdr->data_offset,
112 n_bytes_read = svm_fifo_peek (fifo, hdr->data_offset, deq_now,
114 ASSERT (n_bytes_read > 0);
116 hdr->data_offset += n_bytes_read;
117 if (hdr->data_offset == hdr->data_length)
118 svm_fifo_dequeue_drop (fifo, hdr->data_length);
121 n_bytes_read = svm_fifo_dequeue_nowait (fifo, len_to_deq0, data0);
123 ASSERT (n_bytes_read == len_to_deq0);
124 chain_b0->current_length = n_bytes_read;
125 b0->total_length_not_including_first_buffer += chain_b0->current_length;
127 /* update previous buffer */
128 prev_b0->next_buffer = chain_bi0;
129 prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
131 /* update current buffer */
132 chain_b0->next_buffer = 0;
134 to_deq -= n_bytes_read;
139 && b0->total_length_not_including_first_buffer == left_from_seg);
140 *left_to_snd0 -= left_from_seg;
144 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
145 session_manager_main_t * smm,
146 session_fifo_event_t * e0,
147 stream_session_t * s0, u32 thread_index,
148 int *n_tx_packets, u8 peek_data)
150 u32 n_trace = vlib_get_trace_count (vm, node);
151 u32 left_to_snd0, max_len_to_snd0, len_to_deq0, snd_space0;
152 u32 n_bufs_per_evt, n_frames_per_evt, n_bufs_per_frame;
153 transport_connection_t *tc0;
154 transport_proto_vft_t *transport_vft;
155 transport_proto_t tp;
156 u32 next_index, next0, *to_next, n_left_to_next, bi0;
158 u32 tx_offset = 0, max_dequeue0, n_bytes_per_seg, left_for_seg;
159 u16 snd_mss0, n_bufs_per_seg, n_bufs;
162 u32 n_bytes_per_buf, deq_per_buf, deq_per_first_buf;
163 u32 bufs_alloc, bufs_now;
164 session_dgram_hdr_t hdr;
166 next_index = next0 = smm->session_type_to_next[s0->session_type];
167 tp = session_get_transport_proto (s0);
168 transport_vft = transport_protocol_get_vft (tp);
171 if (PREDICT_FALSE (s0->session_state < SESSION_STATE_READY))
173 /* Can retransmit for closed sessions but can't send new data if
174 * session is not ready or closed */
175 vec_add1 (smm->pending_event_vector[thread_index], *e0);
179 transport_vft->get_connection (s0->connection_index, thread_index);
183 if (s0->session_state == SESSION_STATE_LISTENING)
184 tc0 = transport_vft->get_listener (s0->connection_index);
187 if (PREDICT_FALSE (s0->session_state == SESSION_STATE_CLOSED))
189 tc0 = transport_vft->get_connection (s0->connection_index,
194 /* Make sure we have space to send and there's something to dequeue */
195 snd_mss0 = transport_vft->send_mss (tc0);
196 snd_space0 = transport_vft->send_space (tc0);
198 /* Can't make any progress */
199 if (snd_space0 == 0 || snd_mss0 == 0)
201 vec_add1 (smm->pending_event_vector[thread_index], *e0);
205 /* Allow enqueuing of a new event */
206 svm_fifo_unset_event (s0->server_tx_fifo);
208 /* Check how much we can pull. */
209 max_dequeue0 = svm_fifo_max_dequeue (s0->server_tx_fifo);
212 /* Offset in rx fifo from where to peek data */
213 tx_offset = transport_vft->tx_fifo_offset (tc0);
214 if (PREDICT_FALSE (tx_offset >= max_dequeue0))
216 max_dequeue0 -= tx_offset;
220 if (transport_vft->tx_type == TRANSPORT_TX_DGRAM)
222 if (max_dequeue0 < sizeof (hdr))
224 svm_fifo_peek (s0->server_tx_fifo, 0, sizeof (hdr), (u8 *) & hdr);
225 ASSERT (hdr.data_length > hdr.data_offset);
226 max_dequeue0 = hdr.data_length - hdr.data_offset;
229 ASSERT (max_dequeue0 > 0);
231 /* Ensure we're not writing more than transport window allows */
232 if (max_dequeue0 < snd_space0)
234 /* Constrained by tx queue. Try to send only fully formed segments */
235 max_len_to_snd0 = (max_dequeue0 > snd_mss0) ?
236 max_dequeue0 - max_dequeue0 % snd_mss0 : max_dequeue0;
241 /* Expectation is that snd_space0 is already a multiple of snd_mss */
242 max_len_to_snd0 = snd_space0;
245 n_bytes_per_buf = vlib_buffer_free_list_buffer_size
246 (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
247 ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
248 n_bytes_per_seg = MAX_HDRS_LEN + snd_mss0;
249 n_bufs_per_seg = ceil ((double) n_bytes_per_seg / n_bytes_per_buf);
250 n_bufs_per_evt = ceil ((double) max_len_to_snd0 / n_bytes_per_seg);
251 n_frames_per_evt = ceil ((double) n_bufs_per_evt / VLIB_FRAME_SIZE);
252 n_bufs_per_frame = n_bufs_per_seg * VLIB_FRAME_SIZE;
254 deq_per_buf = clib_min (snd_mss0, n_bytes_per_buf);
255 deq_per_first_buf = clib_min (snd_mss0, n_bytes_per_buf - MAX_HDRS_LEN);
257 n_bufs = vec_len (smm->tx_buffers[thread_index]);
258 left_to_snd0 = max_len_to_snd0;
259 for (i = 0; i < n_frames_per_evt; i++)
261 /* Make sure we have at least one full frame of buffers ready */
262 if (PREDICT_FALSE (n_bufs < n_bufs_per_frame))
264 vec_validate (smm->tx_buffers[thread_index],
265 n_bufs + n_bufs_per_frame - 1);
270 vlib_buffer_alloc (vm,
271 &smm->tx_buffers[thread_index][n_bufs +
273 n_bufs_per_frame - bufs_alloc);
274 bufs_alloc += bufs_now;
276 while (bufs_now > 0 && ((bufs_alloc + n_bufs < n_bufs_per_frame)));
278 n_bufs += bufs_alloc;
279 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
281 if (PREDICT_FALSE (n_bufs < n_bufs_per_frame))
283 vec_add1 (smm->pending_event_vector[thread_index], *e0);
286 ASSERT (n_bufs >= n_bufs_per_frame);
289 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
290 while (left_to_snd0 && n_left_to_next)
293 * Handle first buffer in chain separately
296 len_to_deq0 = clib_min (left_to_snd0, deq_per_first_buf);
297 if (left_to_snd0 > len_to_deq0 && n_left_to_next > 1)
300 u32 pbi = smm->tx_buffers[thread_index][n_bufs - 2];
301 pb = vlib_get_buffer (vm, pbi);
302 vlib_prefetch_buffer_header (pb, LOAD);
305 /* Get free buffer */
306 ASSERT (n_bufs >= 1);
307 bi0 = smm->tx_buffers[thread_index][--n_bufs];
308 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
310 /* usual speculation, or the enqueue_x1 macro will barf */
315 b0 = vlib_get_buffer (vm, bi0);
317 b0->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
318 b0->current_data = 0;
319 b0->total_length_not_including_first_buffer = 0;
321 data0 = vlib_buffer_make_headroom (b0, MAX_HDRS_LEN);
324 n_bytes_read = svm_fifo_peek (s0->server_tx_fifo, tx_offset,
326 if (n_bytes_read <= 0)
328 /* Keep track of progress locally, transport is also supposed to
329 * increment it independently when pushing the header */
330 tx_offset += n_bytes_read;
334 if (transport_vft->tx_type == TRANSPORT_TX_DGRAM)
336 svm_fifo_t *f = s0->server_tx_fifo;
340 ASSERT (hdr.data_length > hdr.data_offset);
341 deq_now = clib_min (hdr.data_length - hdr.data_offset,
343 offset = hdr.data_offset + SESSION_CONN_HDR_LEN;
344 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
345 if (PREDICT_FALSE (n_bytes_read <= 0))
348 if (s0->session_state == SESSION_STATE_LISTENING)
350 ip_copy (&tc0->rmt_ip, &hdr.rmt_ip, tc0->is_ip4);
351 tc0->rmt_port = hdr.rmt_port;
353 hdr.data_offset += n_bytes_read;
354 if (hdr.data_offset == hdr.data_length)
356 offset = hdr.data_length + SESSION_CONN_HDR_LEN;
357 svm_fifo_dequeue_drop (f, offset);
362 n_bytes_read = svm_fifo_dequeue_nowait (s0->server_tx_fifo,
364 if (n_bytes_read <= 0)
369 b0->current_length = n_bytes_read;
370 left_to_snd0 -= n_bytes_read;
371 *n_tx_packets = *n_tx_packets + 1;
374 * Fill in the remaining buffers in the chain, if any
376 if (PREDICT_FALSE (n_bufs_per_seg > 1 && left_to_snd0))
378 left_for_seg = clib_min (snd_mss0 - n_bytes_read, left_to_snd0);
379 session_tx_fifo_chain_tail (smm, vm, thread_index,
380 s0->server_tx_fifo, b0, bi0,
381 n_bufs_per_seg, left_for_seg,
382 &left_to_snd0, &n_bufs, &tx_offset,
383 deq_per_buf, peek_data,
384 transport_vft->tx_type);
387 /* Ask transport to push header after current_length and
388 * total_length_not_including_first_buffer are updated */
389 transport_vft->push_header (tc0, b0);
392 SESSION_EVT_DBG(SESSION_EVT_DEQ, s0, ({
393 ed->data[0] = e0->event_type;
394 ed->data[1] = max_dequeue0;
395 ed->data[2] = len_to_deq0;
396 ed->data[3] = left_to_snd0;
400 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
402 if (PREDICT_FALSE (n_trace > 0))
404 session_queue_trace_t *t0;
405 vlib_trace_buffer (vm, node, next_index, b0,
406 1 /* follow_chain */ );
407 vlib_set_trace_count (vm, node, --n_trace);
408 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
409 t0->session_index = s0->session_index;
410 t0->server_thread_index = s0->thread_index;
413 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
414 to_next, n_left_to_next,
417 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
420 /* If we couldn't dequeue all bytes mark as partially read */
421 if (max_len_to_snd0 < max_dequeue0)
422 if (svm_fifo_set_event (s0->server_tx_fifo))
423 vec_add1 (smm->pending_event_vector[thread_index], *e0);
425 if (!peek_data && transport_vft->tx_type == TRANSPORT_TX_DGRAM)
427 /* Fix dgram pre header */
428 if (max_len_to_snd0 < max_dequeue0)
429 svm_fifo_overwrite_head (s0->server_tx_fifo, (u8 *) & hdr,
430 sizeof (session_dgram_pre_hdr_t));
431 /* More data needs to be read */
432 else if (svm_fifo_max_dequeue (s0->server_tx_fifo) > 0)
433 vec_add1 (smm->pending_event_vector[thread_index], *e0);
439 * Can't read from fifo. If we don't already have an event, save as partially
440 * read, return buff to free list and return
442 clib_warning ("dequeue fail");
443 if (svm_fifo_set_event (s0->server_tx_fifo))
445 vec_add1 (smm->pending_event_vector[thread_index], *e0);
447 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
448 _vec_len (smm->tx_buffers[thread_index]) += 1;
454 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
455 session_manager_main_t * smm,
456 session_fifo_event_t * e0,
457 stream_session_t * s0, u32 thread_index,
460 return session_tx_fifo_read_and_snd_i (vm, node, smm, e0, s0, thread_index,
465 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
466 session_manager_main_t * smm,
467 session_fifo_event_t * e0,
468 stream_session_t * s0, u32 thread_index,
471 return session_tx_fifo_read_and_snd_i (vm, node, smm, e0, s0, thread_index,
476 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
477 vlib_node_runtime_t * node,
478 session_manager_main_t * smm,
479 session_fifo_event_t * e0,
480 stream_session_t * s0, u32 thread_index,
484 app = application_get (s0->opaque);
485 svm_fifo_unset_event (s0->server_tx_fifo);
486 return app->cb_fns.builtin_app_tx_callback (s0);
489 always_inline stream_session_t *
490 session_event_get_session (session_fifo_event_t * e, u8 thread_index)
492 return session_get_if_valid (e->fifo->master_session_index, thread_index);
496 dump_thread_0_event_queue (void)
498 session_manager_main_t *smm = vnet_get_session_manager_main ();
499 vlib_main_t *vm = &vlib_global_main;
500 u32 my_thread_index = vm->thread_index;
501 session_fifo_event_t _e, *e = &_e;
502 stream_session_t *s0;
507 q = smm->vpp_event_queues[my_thread_index];
511 for (i = 0; i < q->cursize; i++)
513 headp = (i8 *) (&q->data[0] + q->elsize * index);
514 clib_memcpy (e, headp, q->elsize);
516 switch (e->event_type)
518 case FIFO_EVENT_APP_TX:
519 s0 = session_event_get_session (e, my_thread_index);
520 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
523 case FIFO_EVENT_DISCONNECT:
524 s0 = session_get_from_handle (e->session_handle);
525 fformat (stdout, "[%04d] disconnect session %d\n", i,
529 case FIFO_EVENT_BUILTIN_RX:
530 s0 = session_event_get_session (e, my_thread_index);
531 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
535 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
536 i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg));
540 fformat (stdout, "[%04d] unhandled event type %d\n",
547 if (index == q->maxsize)
553 session_node_cmp_event (session_fifo_event_t * e, svm_fifo_t * f)
556 switch (e->event_type)
558 case FIFO_EVENT_APP_RX:
559 case FIFO_EVENT_APP_TX:
560 case FIFO_EVENT_BUILTIN_RX:
564 case FIFO_EVENT_DISCONNECT:
567 s = session_get_from_handle (e->session_handle);
570 clib_warning ("session has event but doesn't exist!");
573 if (s->server_rx_fifo == f || s->server_tx_fifo == f)
583 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e)
585 session_manager_main_t *smm = vnet_get_session_manager_main ();
587 session_fifo_event_t *pending_event_vector, *evt;
588 int i, index, found = 0;
593 thread_index = f->master_thread_index;
597 q = smm->vpp_event_queues[thread_index];
599 for (i = 0; i < q->cursize; i++)
601 headp = (i8 *) (&q->data[0] + q->elsize * index);
602 clib_memcpy (e, headp, q->elsize);
603 found = session_node_cmp_event (e, f);
606 if (++index == q->maxsize)
610 * Search pending events vector
612 pending_event_vector = smm->pending_event_vector[thread_index];
613 vec_foreach (evt, pending_event_vector)
615 found = session_node_cmp_event (evt, f);
618 clib_memcpy (e, evt, sizeof (*evt));
626 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
627 vlib_frame_t * frame)
629 session_manager_main_t *smm = vnet_get_session_manager_main ();
630 session_fifo_event_t *my_pending_event_vector, *pending_disconnects, *e;
631 session_fifo_event_t *my_fifo_events;
632 u32 n_to_dequeue, n_events;
635 int n_tx_packets = 0;
636 u32 my_thread_index = vm->thread_index;
638 f64 now = vlib_time_now (vm);
641 SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, my_thread_index);
644 * Update transport time
646 transport_update_time (now, my_thread_index);
649 * Get vpp queue events
651 q = smm->vpp_event_queues[my_thread_index];
652 if (PREDICT_FALSE (q == 0))
655 my_fifo_events = smm->free_event_vector[my_thread_index];
657 /* min number of events we can dequeue without blocking */
658 n_to_dequeue = q->cursize;
659 my_pending_event_vector = smm->pending_event_vector[my_thread_index];
660 pending_disconnects = smm->pending_disconnects[my_thread_index];
662 if (!n_to_dequeue && !vec_len (my_pending_event_vector)
663 && !vec_len (pending_disconnects))
666 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
669 * If we didn't manage to process previous events try going
670 * over them again without dequeuing new ones.
672 /* XXX: Block senders to sessions that can't keep up */
673 if (0 && vec_len (my_pending_event_vector) >= 100)
675 clib_warning ("too many fifo events unsolved");
679 /* See you in the next life, don't be late */
680 if (pthread_mutex_trylock (&q->mutex))
683 for (i = 0; i < n_to_dequeue; i++)
685 vec_add2 (my_fifo_events, e, 1);
686 svm_queue_sub_raw (q, (u8 *) e);
689 /* The other side of the connection is not polling */
690 if (q->cursize < (q->maxsize / 8))
691 (void) pthread_cond_broadcast (&q->condvar);
692 pthread_mutex_unlock (&q->mutex);
694 vec_append (my_fifo_events, my_pending_event_vector);
695 vec_append (my_fifo_events, smm->pending_disconnects[my_thread_index]);
697 _vec_len (my_pending_event_vector) = 0;
698 smm->pending_event_vector[my_thread_index] = my_pending_event_vector;
699 _vec_len (smm->pending_disconnects[my_thread_index]) = 0;
702 n_events = vec_len (my_fifo_events);
703 for (i = 0; i < n_events; i++)
705 stream_session_t *s0; /* $$$ prefetch 1 ahead maybe */
706 session_fifo_event_t *e0;
708 e0 = &my_fifo_events[i];
710 switch (e0->event_type)
712 case FIFO_EVENT_APP_TX:
713 s0 = session_event_get_session (e0, my_thread_index);
715 if (PREDICT_FALSE (!s0))
717 clib_warning ("It's dead, Jim!");
720 /* Spray packets in per session type frames, since they go to
722 rv = (smm->session_tx_fns[s0->session_type]) (vm, node, smm, e0, s0,
726 if (PREDICT_FALSE (rv < 0))
728 vlib_node_increment_counter (vm, node->node_index,
729 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
733 case FIFO_EVENT_DISCONNECT:
734 /* Make sure disconnects run after the pending list is drained */
738 vec_add1 (smm->pending_disconnects[my_thread_index], *e0);
741 s0 = session_get_from_handle (e0->session_handle);
742 stream_session_disconnect_transport (s0);
744 case FIFO_EVENT_BUILTIN_RX:
745 s0 = session_event_get_session (e0, my_thread_index);
746 if (PREDICT_FALSE (!s0))
748 svm_fifo_unset_event (s0->server_rx_fifo);
749 app = application_get (s0->app_index);
750 app->cb_fns.builtin_app_rx_callback (s0);
753 fp = e0->rpc_args.fp;
754 (*fp) (e0->rpc_args.arg);
758 clib_warning ("unhandled event type %d", e0->event_type);
762 _vec_len (my_fifo_events) = 0;
763 smm->free_event_vector[my_thread_index] = my_fifo_events;
765 vlib_node_increment_counter (vm, session_queue_node.index,
766 SESSION_QUEUE_ERROR_TX, n_tx_packets);
768 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 1);
774 VLIB_REGISTER_NODE (session_queue_node) =
776 .function = session_queue_node_fn,
777 .name = "session-queue",
778 .format_trace = format_session_queue_trace,
779 .type = VLIB_NODE_TYPE_INPUT,
780 .n_errors = ARRAY_LEN (session_queue_error_strings),
781 .error_strings = session_queue_error_strings,
782 .state = VLIB_NODE_STATE_DISABLED,
786 static clib_error_t *
787 session_queue_exit (vlib_main_t * vm)
789 if (vec_len (vlib_mains) < 2)
793 * Shut off (especially) worker-thread session nodes.
794 * Otherwise, vpp can crash as the main thread unmaps the
797 vlib_worker_thread_barrier_sync (vm);
798 session_node_enable_disable (0 /* is_enable */ );
799 vlib_worker_thread_barrier_release (vm);
803 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
806 * fd.io coding-style-patch-verification: ON
809 * eval: (c-set-style "gnu")