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.
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/session.h>
22 #include <vnet/session/application.h>
23 #include <vnet/session/application_interface.h>
24 #include <vnet/session/application_local.h>
25 #include <vnet/session/session_debug.h>
26 #include <svm/queue.h>
28 #define app_check_thread_and_barrier(_fn, _arg) \
29 if (!vlib_thread_is_main_w_barrier ()) \
31 vlib_rpc_call_main_thread (_fn, (u8 *) _arg, sizeof(*_arg)); \
36 session_mq_listen_handler (void *data)
38 session_listen_msg_t *mp = (session_listen_msg_t *) data;
39 vnet_listen_args_t _a, *a = &_a;
40 app_worker_t *app_wrk;
44 app_check_thread_and_barrier (session_mq_listen_handler, mp);
46 app = application_lookup (mp->client_index);
50 clib_memset (a, 0, sizeof (*a));
51 a->sep.is_ip4 = mp->is_ip4;
52 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
53 a->sep.port = mp->port;
54 a->sep.fib_index = mp->vrf;
55 a->sep.sw_if_index = ENDPOINT_INVALID_INDEX;
56 a->sep.transport_proto = mp->proto;
57 a->sep_ext.ckpair_index = mp->ckpair_index;
58 a->app_index = app->app_index;
59 a->wrk_map_index = mp->wrk_index;
61 if ((rv = vnet_listen (a)))
62 clib_warning ("listen returned: %d", rv);
64 app_wrk = application_get_worker (app, mp->wrk_index);
65 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
70 session_mq_listen_uri_handler (void *data)
72 session_listen_uri_msg_t *mp = (session_listen_uri_msg_t *) data;
73 vnet_listen_args_t _a, *a = &_a;
74 app_worker_t *app_wrk;
78 app_check_thread_and_barrier (session_mq_listen_uri_handler, mp);
80 app = application_lookup (mp->client_index);
84 clib_memset (a, 0, sizeof (*a));
85 a->uri = (char *) mp->uri;
86 a->app_index = app->app_index;
87 rv = vnet_bind_uri (a);
89 app_wrk = application_get_worker (app, 0);
90 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
94 session_mq_connect_handler (void *data)
96 session_connect_msg_t *mp = (session_connect_msg_t *) data;
97 vnet_connect_args_t _a, *a = &_a;
98 app_worker_t *app_wrk;
102 app_check_thread_and_barrier (session_mq_connect_handler, mp);
104 app = application_lookup (mp->client_index);
108 clib_memset (a, 0, sizeof (*a));
109 a->sep.is_ip4 = mp->is_ip4;
110 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
111 a->sep.port = mp->port;
112 a->sep.transport_proto = mp->proto;
113 a->sep.peer.fib_index = mp->vrf;
114 a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX;
115 a->sep_ext.parent_handle = mp->parent_handle;
116 a->sep_ext.ckpair_index = mp->ckpair_index;
117 if (mp->hostname_len)
119 vec_validate (a->sep_ext.hostname, mp->hostname_len - 1);
120 clib_memcpy_fast (a->sep_ext.hostname, mp->hostname, mp->hostname_len);
122 a->api_context = mp->context;
123 a->app_index = app->app_index;
124 a->wrk_map_index = mp->wrk_index;
126 if ((rv = vnet_connect (a)))
128 clib_warning ("connect returned: %U", format_vnet_api_errno, rv);
129 app_wrk = application_get_worker (app, mp->wrk_index);
130 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0,
134 vec_free (a->sep_ext.hostname);
138 session_mq_connect_uri_handler (void *data)
140 session_connect_uri_msg_t *mp = (session_connect_uri_msg_t *) data;
141 vnet_connect_args_t _a, *a = &_a;
142 app_worker_t *app_wrk;
146 app_check_thread_and_barrier (session_mq_connect_uri_handler, mp);
148 app = application_lookup (mp->client_index);
152 clib_memset (a, 0, sizeof (*a));
153 a->uri = (char *) mp->uri;
154 a->api_context = mp->context;
155 a->app_index = app->app_index;
156 if ((rv = vnet_connect_uri (a)))
158 clib_warning ("connect_uri returned: %d", rv);
159 app_wrk = application_get_worker (app, 0 /* default wrk only */ );
160 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0,
166 session_mq_disconnect_handler (void *data)
168 session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data;
169 vnet_disconnect_args_t _a, *a = &_a;
172 app = application_lookup (mp->client_index);
176 a->app_index = app->app_index;
177 a->handle = mp->handle;
178 vnet_disconnect_session (a);
182 app_mq_detach_handler (void *data)
184 session_app_detach_msg_t *mp = (session_app_detach_msg_t *) data;
185 vnet_app_detach_args_t _a, *a = &_a;
188 app_check_thread_and_barrier (app_mq_detach_handler, mp);
190 app = application_lookup (mp->client_index);
194 a->app_index = app->app_index;
195 a->api_client_index = mp->client_index;
196 vnet_application_detach (a);
200 session_mq_unlisten_handler (void *data)
202 session_unlisten_msg_t *mp = (session_unlisten_msg_t *) data;
203 vnet_unlisten_args_t _a, *a = &_a;
204 app_worker_t *app_wrk;
208 app_check_thread_and_barrier (session_mq_unlisten_handler, mp);
210 app = application_lookup (mp->client_index);
214 clib_memset (a, 0, sizeof (*a));
215 a->app_index = app->app_index;
216 a->handle = mp->handle;
217 a->wrk_map_index = mp->wrk_index;
218 if ((rv = vnet_unlisten (a)))
219 clib_warning ("unlisten returned: %d", rv);
221 app_wrk = application_get_worker (app, a->wrk_map_index);
225 mq_send_unlisten_reply (app_wrk, mp->handle, mp->context, rv);
229 session_mq_accepted_reply_handler (void *data)
231 session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
232 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
233 session_state_t old_state;
234 app_worker_t *app_wrk;
237 /* Server isn't interested, kill the session */
240 a->app_index = mp->context;
241 a->handle = mp->handle;
242 vnet_disconnect_session (a);
246 /* Mail this back from the main thread. We're not polling in main
247 * thread so we're using other workers for notifications. */
248 if (vlib_num_workers () && vlib_get_thread_index () != 0
249 && session_thread_from_handle (mp->handle) == 0)
251 vlib_rpc_call_main_thread (session_mq_accepted_reply_handler,
252 (u8 *) mp, sizeof (*mp));
256 s = session_get_from_handle_if_valid (mp->handle);
260 app_wrk = app_worker_get (s->app_wrk_index);
261 if (app_wrk->app_index != mp->context)
263 clib_warning ("app doesn't own session");
267 if (!session_has_transport (s))
269 s->session_state = SESSION_STATE_READY;
270 if (ct_session_connect_notify (s))
275 old_state = s->session_state;
276 s->session_state = SESSION_STATE_READY;
278 if (!svm_fifo_is_empty_prod (s->rx_fifo))
279 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
281 /* Closed while waiting for app to reply. Resend disconnect */
282 if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
284 app_worker_close_notify (app_wrk, s);
285 s->session_state = old_state;
292 session_mq_reset_reply_handler (void *data)
294 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
295 session_reset_reply_msg_t *mp;
296 app_worker_t *app_wrk;
299 u32 index, thread_index;
301 mp = (session_reset_reply_msg_t *) data;
302 app = application_lookup (mp->context);
306 session_parse_handle (mp->handle, &index, &thread_index);
307 s = session_get_if_valid (index, thread_index);
309 /* Session was already closed or already cleaned up */
310 if (!s || s->session_state != SESSION_STATE_TRANSPORT_CLOSING)
313 app_wrk = app_worker_get (s->app_wrk_index);
314 if (!app_wrk || app_wrk->app_index != app->app_index)
316 clib_warning ("App %u does not own handle 0x%lx!", app->app_index,
321 /* Client objected to resetting the session, log and continue */
324 clib_warning ("client retval %d", mp->retval);
328 /* This comes as a response to a reset, transport only waiting for
329 * confirmation to remove connection state, no need to disconnect */
330 a->handle = mp->handle;
331 a->app_index = app->app_index;
332 vnet_disconnect_session (a);
336 session_mq_disconnected_handler (void *data)
338 session_disconnected_reply_msg_t *rmp;
339 vnet_disconnect_args_t _a, *a = &_a;
340 svm_msg_q_msg_t _msg, *msg = &_msg;
341 session_disconnected_msg_t *mp;
342 app_worker_t *app_wrk;
343 session_event_t *evt;
348 mp = (session_disconnected_msg_t *) data;
349 if (!(s = session_get_from_handle_if_valid (mp->handle)))
351 clib_warning ("could not disconnect handle %llu", mp->handle);
354 app_wrk = app_worker_get (s->app_wrk_index);
355 app = application_lookup (mp->client_index);
356 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
358 clib_warning ("could not disconnect session: %llu app: %u",
359 mp->handle, mp->client_index);
363 a->handle = mp->handle;
364 a->app_index = app_wrk->wrk_index;
365 rv = vnet_disconnect_session (a);
367 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
368 SESSION_MQ_CTRL_EVT_RING,
370 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
371 clib_memset (evt, 0, sizeof (*evt));
372 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
373 rmp = (session_disconnected_reply_msg_t *) evt->data;
374 rmp->handle = mp->handle;
375 rmp->context = mp->context;
377 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
381 session_mq_disconnected_reply_handler (void *data)
383 session_disconnected_reply_msg_t *mp;
384 vnet_disconnect_args_t _a, *a = &_a;
387 mp = (session_disconnected_reply_msg_t *) data;
389 /* Client objected to disconnecting the session, log and continue */
392 clib_warning ("client retval %d", mp->retval);
396 /* Disconnect has been confirmed. Confirm close to transport */
397 app = application_lookup (mp->context);
400 a->handle = mp->handle;
401 a->app_index = app->app_index;
402 vnet_disconnect_session (a);
407 session_mq_worker_update_handler (void *data)
409 session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
410 session_worker_update_reply_msg_t *rmp;
411 svm_msg_q_msg_t _msg, *msg = &_msg;
412 app_worker_t *app_wrk;
413 u32 owner_app_wrk_map;
414 session_event_t *evt;
418 app = application_lookup (mp->client_index);
421 if (!(s = session_get_from_handle_if_valid (mp->handle)))
423 clib_warning ("invalid handle %llu", mp->handle);
426 app_wrk = app_worker_get (s->app_wrk_index);
427 if (app_wrk->app_index != app->app_index)
429 clib_warning ("app %u does not own session %llu", app->app_index,
433 owner_app_wrk_map = app_wrk->wrk_map_index;
434 app_wrk = application_get_worker (app, mp->wrk_index);
436 /* This needs to come from the new owner */
437 if (mp->req_wrk_index == owner_app_wrk_map)
439 session_req_worker_update_msg_t *wump;
441 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
442 SESSION_MQ_CTRL_EVT_RING,
444 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
445 clib_memset (evt, 0, sizeof (*evt));
446 evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
447 wump = (session_req_worker_update_msg_t *) evt->data;
448 wump->session_handle = mp->handle;
449 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
453 app_worker_own_session (app_wrk, s);
458 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
459 SESSION_MQ_CTRL_EVT_RING,
461 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
462 clib_memset (evt, 0, sizeof (*evt));
463 evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
464 rmp = (session_worker_update_reply_msg_t *) evt->data;
465 rmp->handle = mp->handle;
466 rmp->rx_fifo = pointer_to_uword (s->rx_fifo);
467 rmp->tx_fifo = pointer_to_uword (s->tx_fifo);
468 rmp->segment_handle = session_segment_handle (s);
469 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
472 * Retransmit messages that may have been lost
474 if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
475 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
477 if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
478 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
480 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
481 app_worker_close_notify (app_wrk, s);
484 vlib_node_registration_t session_queue_node;
489 u32 server_thread_index;
490 } session_queue_trace_t;
492 /* packet trace format function */
494 format_session_queue_trace (u8 * s, va_list * args)
496 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
497 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
498 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
500 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
501 t->session_index, t->server_thread_index);
505 #define foreach_session_queue_error \
506 _(TX, "Packets transmitted") \
507 _(TIMER, "Timer events") \
508 _(NO_BUFFER, "Out of buffers")
512 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
513 foreach_session_queue_error
515 SESSION_QUEUE_N_ERROR,
516 } session_queue_error_t;
518 static char *session_queue_error_strings[] = {
519 #define _(sym,string) string,
520 foreach_session_queue_error
526 SESSION_TX_NO_BUFFERS = -2,
532 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
533 u32 next_index, u32 * to_next, u16 n_segs,
534 session_t * s, u32 n_trace)
536 session_queue_trace_t *t;
540 for (i = 0; i < clib_min (n_trace, n_segs); i++)
542 b = vlib_get_buffer (vm, to_next[i - n_segs]);
543 vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
544 t = vlib_add_trace (vm, node, b, sizeof (*t));
545 t->session_index = s->session_index;
546 t->server_thread_index = s->thread_index;
548 vlib_set_trace_count (vm, node, n_trace - i);
552 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
553 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
555 vlib_buffer_t *chain_b, *prev_b;
556 u32 chain_bi0, to_deq, left_from_seg;
557 session_worker_t *wrk;
558 u16 len_to_deq, n_bytes_read;
561 wrk = session_main_get_worker (ctx->s->thread_index);
562 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
563 b->total_length_not_including_first_buffer = 0;
566 left_from_seg = clib_min (ctx->snd_mss - b->current_length,
568 to_deq = left_from_seg;
569 for (j = 1; j < ctx->n_bufs_per_seg; j++)
572 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
575 chain_bi0 = wrk->tx_buffers[*n_bufs];
576 chain_b = vlib_get_buffer (vm, chain_bi0);
577 chain_b->current_data = 0;
578 data = vlib_buffer_get_current (chain_b);
581 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo,
582 ctx->tx_offset, len_to_deq, data);
583 ctx->tx_offset += n_bytes_read;
587 if (ctx->transport_vft->transport_options.tx_type ==
590 svm_fifo_t *f = ctx->s->tx_fifo;
591 session_dgram_hdr_t *hdr = &ctx->hdr;
593 deq_now = clib_min (hdr->data_length - hdr->data_offset,
595 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
597 ASSERT (n_bytes_read > 0);
599 hdr->data_offset += n_bytes_read;
600 if (hdr->data_offset == hdr->data_length)
602 u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
603 svm_fifo_dequeue_drop (f, offset);
607 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
610 ASSERT (n_bytes_read == len_to_deq);
611 chain_b->current_length = n_bytes_read;
612 b->total_length_not_including_first_buffer += chain_b->current_length;
614 /* update previous buffer */
615 prev_b->next_buffer = chain_bi0;
616 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
618 /* update current buffer */
619 chain_b->next_buffer = 0;
621 to_deq -= n_bytes_read;
626 && b->total_length_not_including_first_buffer == left_from_seg);
627 ctx->left_to_snd -= left_from_seg;
631 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
632 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
639 * Start with the first buffer in chain
642 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
645 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
646 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
650 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->tx_offset,
652 ASSERT (n_bytes_read > 0);
653 /* Keep track of progress locally, transport is also supposed to
654 * increment it independently when pushing the header */
655 ctx->tx_offset += n_bytes_read;
659 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
661 session_dgram_hdr_t *hdr = &ctx->hdr;
662 svm_fifo_t *f = ctx->s->tx_fifo;
666 ASSERT (hdr->data_length > hdr->data_offset);
667 deq_now = clib_min (hdr->data_length - hdr->data_offset,
669 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
670 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
671 ASSERT (n_bytes_read > 0);
673 if (ctx->s->session_state == SESSION_STATE_LISTENING)
675 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
676 ctx->tc->rmt_port = hdr->rmt_port;
678 hdr->data_offset += n_bytes_read;
679 if (hdr->data_offset == hdr->data_length)
681 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
682 svm_fifo_dequeue_drop (f, offset);
687 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
689 ASSERT (n_bytes_read > 0);
692 b->current_length = n_bytes_read;
693 ctx->left_to_snd -= n_bytes_read;
696 * Fill in the remaining buffers in the chain, if any
698 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
699 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
703 session_tx_not_ready (session_t * s, u8 peek_data)
707 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
709 /* Can retransmit for closed sessions but can't send new data if
710 * session is not ready or closed */
711 else if (s->session_state < SESSION_STATE_READY)
713 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
715 /* Allow closed transports to still send custom packets.
716 * For instance, tcp may want to send acks in time-wait. */
717 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
718 && (s->flags & SESSION_F_CUSTOM_TX))
726 always_inline transport_connection_t *
727 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
731 return ctx->transport_vft->get_connection (ctx->s->connection_index,
732 ctx->s->thread_index);
736 if (ctx->s->session_state == SESSION_STATE_LISTENING)
737 return ctx->transport_vft->get_listener (ctx->s->connection_index);
740 return ctx->transport_vft->get_connection (ctx->s->connection_index,
741 ctx->s->thread_index);
747 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
748 u32 max_segs, u8 peek_data)
750 u32 n_bytes_per_buf, n_bytes_per_seg;
751 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
754 /* Offset in rx fifo from where to peek data */
755 ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
756 if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
758 ctx->max_len_to_snd = 0;
761 ctx->max_dequeue -= ctx->tx_offset;
765 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
767 if (ctx->max_dequeue <= sizeof (ctx->hdr))
769 ctx->max_len_to_snd = 0;
772 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
774 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
775 ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
778 ASSERT (ctx->max_dequeue > 0);
780 /* Ensure we're not writing more than transport window allows */
781 if (ctx->max_dequeue < ctx->snd_space)
783 /* Constrained by tx queue. Try to send only fully formed segments */
784 ctx->max_len_to_snd =
785 (ctx->max_dequeue > ctx->snd_mss) ?
786 ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
791 /* Expectation is that snd_space0 is already a multiple of snd_mss */
792 ctx->max_len_to_snd = ctx->snd_space;
795 /* Check if we're tx constrained by the node */
796 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
797 if (ctx->n_segs_per_evt > max_segs)
799 ctx->n_segs_per_evt = max_segs;
800 ctx->max_len_to_snd = max_segs * ctx->snd_mss;
803 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
804 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
805 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->snd_mss;
806 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
807 ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
808 ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
810 TRANSPORT_MAX_HDRS_LEN);
814 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
815 vlib_node_runtime_t * node,
816 session_evt_elt_t * elt,
817 int *n_tx_packets, u8 peek_data)
819 u32 n_trace, n_bufs_needed = 0, n_left, pbi, next_index, max_burst;
820 session_tx_context_t *ctx = &wrk->ctx;
821 session_main_t *smm = &session_main;
822 session_event_t *e = &elt->evt;
823 vlib_main_t *vm = wrk->vm;
824 transport_proto_t tp;
828 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
831 session_evt_add_old (wrk, elt);
832 return SESSION_TX_NO_DATA;
835 next_index = smm->session_type_to_next[ctx->s->session_type];
836 max_burst = VLIB_FRAME_SIZE - *n_tx_packets;
838 tp = session_get_transport_proto (ctx->s);
839 ctx->transport_vft = transport_protocol_get_vft (tp);
840 ctx->tc = session_tx_get_transport (ctx, peek_data);
842 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
844 if (ctx->transport_vft->flush_data)
845 ctx->transport_vft->flush_data (ctx->tc);
846 e->event_type = SESSION_IO_EVT_TX;
849 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
852 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
853 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, max_burst);
854 *n_tx_packets += n_custom_tx;
856 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
857 return SESSION_TX_OK;
858 max_burst -= n_custom_tx;
861 session_evt_add_old (wrk, elt);
862 return SESSION_TX_OK;
866 ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
867 ctx->snd_space = transport_connection_snd_space (ctx->tc,
872 if (ctx->snd_space == 0 || ctx->snd_mss == 0)
874 session_evt_add_old (wrk, elt);
875 return SESSION_TX_NO_DATA;
878 /* Allow enqueuing of a new event */
879 svm_fifo_unset_event (ctx->s->tx_fifo);
881 /* Check how much we can pull. */
882 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
884 if (PREDICT_FALSE (!ctx->max_len_to_snd))
886 transport_connection_tx_pacer_reset_bucket (ctx->tc,
889 return SESSION_TX_NO_DATA;
892 n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
893 vec_validate_aligned (wrk->tx_buffers, n_bufs_needed - 1,
894 CLIB_CACHE_LINE_BYTES);
895 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_needed);
896 if (PREDICT_FALSE (n_bufs < n_bufs_needed))
899 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
900 session_evt_add_old (wrk, elt);
901 vlib_node_increment_counter (wrk->vm, node->node_index,
902 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
903 return SESSION_TX_NO_BUFFERS;
906 ctx->left_to_snd = ctx->max_len_to_snd;
907 n_left = ctx->n_segs_per_evt;
911 vlib_buffer_t *b0, *b1;
914 pbi = wrk->tx_buffers[n_bufs - 3];
915 pb = vlib_get_buffer (vm, pbi);
916 vlib_prefetch_buffer_header (pb, STORE);
917 pbi = wrk->tx_buffers[n_bufs - 4];
918 pb = vlib_get_buffer (vm, pbi);
919 vlib_prefetch_buffer_header (pb, STORE);
921 bi0 = wrk->tx_buffers[--n_bufs];
922 bi1 = wrk->tx_buffers[--n_bufs];
924 b0 = vlib_get_buffer (vm, bi0);
925 b1 = vlib_get_buffer (vm, bi1);
927 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
928 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
930 ctx->transport_vft->push_header (ctx->tc, b0);
931 ctx->transport_vft->push_header (ctx->tc, b1);
935 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
936 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
938 vec_add1 (wrk->pending_tx_buffers, bi0);
939 vec_add1 (wrk->pending_tx_buffers, bi1);
940 vec_add1 (wrk->pending_tx_nexts, next_index);
941 vec_add1 (wrk->pending_tx_nexts, next_index);
950 pbi = wrk->tx_buffers[n_bufs - 2];
951 pb = vlib_get_buffer (vm, pbi);
952 vlib_prefetch_buffer_header (pb, STORE);
955 bi0 = wrk->tx_buffers[--n_bufs];
956 b0 = vlib_get_buffer (vm, bi0);
957 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
959 /* Ask transport to push header after current_length and
960 * total_length_not_including_first_buffer are updated */
961 ctx->transport_vft->push_header (ctx->tc, b0);
965 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
967 vec_add1 (wrk->pending_tx_buffers, bi0);
968 vec_add1 (wrk->pending_tx_nexts, next_index);
971 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
972 session_tx_trace_frame (vm, node, next_index, wrk->pending_tx_buffers,
973 ctx->n_segs_per_evt, ctx->s, n_trace);
975 if (PREDICT_FALSE (n_bufs))
976 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
978 *n_tx_packets += ctx->n_segs_per_evt;
979 transport_connection_update_tx_bytes (ctx->tc, ctx->max_len_to_snd);
981 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
982 ctx->s->tx_fifo->has_event, wrk->last_vlib_time);
984 /* If we couldn't dequeue all bytes mark as partially read */
985 ASSERT (ctx->left_to_snd == 0);
986 if (ctx->max_len_to_snd < ctx->max_dequeue)
987 if (svm_fifo_set_event (ctx->s->tx_fifo))
988 session_evt_add_old (wrk, elt);
991 && ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
993 /* Fix dgram pre header */
994 if (ctx->max_len_to_snd < ctx->max_dequeue)
995 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
996 sizeof (session_dgram_pre_hdr_t));
997 /* More data needs to be read */
998 else if (svm_fifo_max_dequeue_cons (ctx->s->tx_fifo) > 0)
999 if (svm_fifo_set_event (ctx->s->tx_fifo))
1000 session_evt_add_old (wrk, elt);
1002 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, ctx->max_len_to_snd))
1003 session_dequeue_notify (ctx->s);
1005 return SESSION_TX_OK;
1009 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1010 vlib_node_runtime_t * node,
1011 session_evt_elt_t * e, int *n_tx_packets)
1013 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1017 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1018 vlib_node_runtime_t * node,
1019 session_evt_elt_t * e, int *n_tx_packets)
1021 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1025 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1026 vlib_node_runtime_t * node,
1027 session_evt_elt_t * e, int *n_tx_packets)
1029 session_t *s = wrk->ctx.s;
1031 if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1033 svm_fifo_unset_event (s->tx_fifo);
1034 return transport_custom_tx (session_get_transport_proto (s), s,
1035 VLIB_FRAME_SIZE - *n_tx_packets);
1038 always_inline session_t *
1039 session_event_get_session (session_event_t * e, u8 thread_index)
1041 return session_get_if_valid (e->session_index, thread_index);
1045 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1047 clib_llist_index_t ei;
1048 void (*fp) (void *);
1052 ei = clib_llist_entry_index (wrk->event_elts, elt);
1055 switch (e->event_type)
1057 case SESSION_CTRL_EVT_RPC:
1058 fp = e->rpc_args.fp;
1059 (*fp) (e->rpc_args.arg);
1061 case SESSION_CTRL_EVT_CLOSE:
1062 s = session_get_from_handle_if_valid (e->session_handle);
1063 if (PREDICT_FALSE (!s))
1065 session_transport_close (s);
1067 case SESSION_CTRL_EVT_RESET:
1068 s = session_get_from_handle_if_valid (e->session_handle);
1069 if (PREDICT_FALSE (!s))
1071 session_transport_reset (s);
1073 case SESSION_CTRL_EVT_LISTEN:
1074 session_mq_listen_handler (session_evt_ctrl_data (wrk, elt));
1076 case SESSION_CTRL_EVT_LISTEN_URI:
1077 session_mq_listen_uri_handler (session_evt_ctrl_data (wrk, elt));
1079 case SESSION_CTRL_EVT_UNLISTEN:
1080 session_mq_unlisten_handler (session_evt_ctrl_data (wrk, elt));
1082 case SESSION_CTRL_EVT_CONNECT:
1083 session_mq_connect_handler (session_evt_ctrl_data (wrk, elt));
1085 case SESSION_CTRL_EVT_CONNECT_URI:
1086 session_mq_connect_uri_handler (session_evt_ctrl_data (wrk, elt));
1088 case SESSION_CTRL_EVT_DISCONNECT:
1089 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1091 case SESSION_CTRL_EVT_DISCONNECTED:
1092 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1094 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1095 session_mq_accepted_reply_handler (session_evt_ctrl_data (wrk, elt));
1097 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1098 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1101 case SESSION_CTRL_EVT_RESET_REPLY:
1102 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1104 case SESSION_CTRL_EVT_WORKER_UPDATE:
1105 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1107 case SESSION_CTRL_EVT_APP_DETACH:
1108 app_mq_detach_handler (session_evt_ctrl_data (wrk, elt));
1111 clib_warning ("unhandled event type %d", e->event_type);
1114 /* Regrab elements in case pool moved */
1115 elt = pool_elt_at_index (wrk->event_elts, ei);
1116 if (!clib_llist_elt_is_linked (elt, evt_list))
1119 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1120 session_evt_ctrl_data_free (wrk, elt);
1121 session_evt_elt_free (wrk, elt);
1126 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1127 session_evt_elt_t * elt, u32 thread_index,
1130 session_main_t *smm = &session_main;
1131 app_worker_t *app_wrk;
1132 clib_llist_index_t ei;
1136 ei = clib_llist_entry_index (wrk->event_elts, elt);
1139 switch (e->event_type)
1141 case SESSION_IO_EVT_TX_FLUSH:
1142 case SESSION_IO_EVT_TX:
1143 s = session_event_get_session (e, thread_index);
1144 if (PREDICT_FALSE (!s))
1146 clib_warning ("session %u was freed!", e->session_index);
1149 CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1151 /* Spray packets in per session type frames, since they go to
1152 * different nodes */
1153 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1155 case SESSION_IO_EVT_RX:
1156 s = session_event_get_session (e, thread_index);
1159 transport_app_rx_evt (session_get_transport_proto (s),
1160 s->connection_index, s->thread_index);
1162 case SESSION_IO_EVT_BUILTIN_RX:
1163 s = session_event_get_session (e, thread_index);
1164 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1166 svm_fifo_unset_event (s->rx_fifo);
1167 app_wrk = app_worker_get (s->app_wrk_index);
1168 app_worker_builtin_rx (app_wrk, s);
1170 case SESSION_IO_EVT_BUILTIN_TX:
1171 s = session_get_from_handle_if_valid (e->session_handle);
1173 if (PREDICT_TRUE (s != 0))
1174 session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets);
1177 clib_warning ("unhandled event type %d", e->event_type);
1180 /* Regrab elements in case pool moved */
1181 elt = pool_elt_at_index (wrk->event_elts, ei);
1182 if (!clib_llist_elt_is_linked (elt, evt_list))
1183 session_evt_elt_free (wrk, elt);
1187 static const u32 session_evt_msg_sizes[] = {
1188 #define _(symc, sym) \
1189 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1190 foreach_session_ctrl_evt
1196 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1198 session_evt_elt_t *elt;
1200 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1202 elt = session_evt_alloc_ctrl (wrk);
1203 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1205 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1206 elt->evt.event_type = evt->event_type;
1207 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1208 session_evt_msg_sizes[evt->event_type]);
1212 /* Internal control events fit into io events footprint */
1213 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1218 elt = session_evt_alloc_new (wrk);
1219 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1224 session_flush_pending_tx_buffers (session_worker_t * wrk,
1225 vlib_node_runtime_t * node)
1227 vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
1228 wrk->pending_tx_nexts,
1229 vec_len (wrk->pending_tx_nexts));
1230 vec_reset_length (wrk->pending_tx_buffers);
1231 vec_reset_length (wrk->pending_tx_nexts);
1235 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1236 vlib_frame_t * frame)
1238 session_main_t *smm = vnet_get_session_main ();
1239 u32 thread_index = vm->thread_index, n_to_dequeue;
1240 session_worker_t *wrk = &smm->wrk[thread_index];
1241 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1242 svm_msg_q_msg_t _msg, *msg = &_msg;
1243 clib_llist_index_t old_ti;
1244 int i, n_tx_packets = 0;
1245 session_event_t *evt;
1248 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1250 wrk->last_vlib_time = vlib_time_now (vm);
1253 * Update transport time
1255 transport_update_time (wrk->last_vlib_time, thread_index);
1258 * Dequeue and handle new events
1261 /* Try to dequeue what is available. Don't wait for lock.
1262 * XXX: we may need priorities here */
1263 mq = wrk->vpp_event_queue;
1264 n_to_dequeue = svm_msg_q_size (mq);
1265 if (n_to_dequeue && svm_msg_q_try_lock (mq) == 0)
1267 for (i = 0; i < n_to_dequeue; i++)
1269 svm_msg_q_sub_w_lock (mq, msg);
1270 evt = svm_msg_q_msg_data (mq, msg);
1271 session_evt_add_to_list (wrk, evt);
1272 svm_msg_q_free_msg (mq, msg);
1274 svm_msg_q_unlock (mq);
1278 * Handle control events
1281 ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head);
1284 clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({
1285 clib_llist_remove (wrk->event_elts, evt_list, elt);
1286 session_event_dispatch_ctrl (wrk, elt);
1291 * Handle the new io events.
1294 new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head);
1297 clib_llist_foreach_safe (wrk->event_elts, evt_list, new_he, elt, ({
1298 session_evt_type_t et;
1300 et = elt->evt.event_type;
1301 clib_llist_remove (wrk->event_elts, evt_list, elt);
1303 /* Postpone tx events if we can't handle them this dispatch cycle */
1304 if (n_tx_packets >= VLIB_FRAME_SIZE
1305 && (et == SESSION_IO_EVT_TX || et == SESSION_IO_EVT_TX_FLUSH))
1307 clib_llist_add (wrk->event_elts, evt_list, elt, new_he);
1311 session_event_dispatch_io (wrk, node, elt, thread_index, &n_tx_packets);
1316 * Handle the old io events
1319 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1320 old_ti = clib_llist_prev_index (old_he, evt_list);
1322 while (n_tx_packets < VLIB_FRAME_SIZE
1323 && !clib_llist_is_empty (wrk->event_elts, evt_list, old_he))
1325 clib_llist_index_t ei;
1327 clib_llist_pop_first (wrk->event_elts, evt_list, elt, old_he);
1328 ei = clib_llist_entry_index (wrk->event_elts, elt);
1329 session_event_dispatch_io (wrk, node, elt, thread_index, &n_tx_packets);
1331 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1336 if (vec_len (wrk->pending_tx_buffers))
1337 session_flush_pending_tx_buffers (wrk, node);
1339 vlib_node_increment_counter (vm, session_queue_node.index,
1340 SESSION_QUEUE_ERROR_TX, n_tx_packets);
1342 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
1344 return n_tx_packets;
1348 VLIB_REGISTER_NODE (session_queue_node) =
1350 .function = session_queue_node_fn,
1351 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1352 .name = "session-queue",
1353 .format_trace = format_session_queue_trace,
1354 .type = VLIB_NODE_TYPE_INPUT,
1355 .n_errors = ARRAY_LEN (session_queue_error_strings),
1356 .error_strings = session_queue_error_strings,
1357 .state = VLIB_NODE_STATE_DISABLED,
1362 dump_thread_0_event_queue (void)
1364 session_main_t *smm = vnet_get_session_main ();
1365 vlib_main_t *vm = &vlib_global_main;
1366 u32 my_thread_index = vm->thread_index;
1367 session_event_t _e, *e = &_e;
1368 svm_msg_q_ring_t *ring;
1370 svm_msg_q_msg_t *msg;
1374 mq = smm->wrk[my_thread_index].vpp_event_queue;
1375 index = mq->q->head;
1377 for (i = 0; i < mq->q->cursize; i++)
1379 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
1380 ring = svm_msg_q_ring (mq, msg->ring_index);
1381 clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
1383 switch (e->event_type)
1385 case SESSION_IO_EVT_TX:
1386 s0 = session_event_get_session (e, my_thread_index);
1387 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
1390 case SESSION_CTRL_EVT_CLOSE:
1391 s0 = session_get_from_handle (e->session_handle);
1392 fformat (stdout, "[%04d] disconnect session %d\n", i,
1396 case SESSION_IO_EVT_BUILTIN_RX:
1397 s0 = session_event_get_session (e, my_thread_index);
1398 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
1401 case SESSION_CTRL_EVT_RPC:
1402 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
1403 i, (u64) (uword) (e->rpc_args.fp),
1404 (u64) (uword) (e->rpc_args.arg));
1408 fformat (stdout, "[%04d] unhandled event type %d\n",
1415 if (index == mq->q->maxsize)
1421 session_node_cmp_event (session_event_t * e, svm_fifo_t * f)
1424 switch (e->event_type)
1426 case SESSION_IO_EVT_RX:
1427 case SESSION_IO_EVT_TX:
1428 case SESSION_IO_EVT_BUILTIN_RX:
1429 case SESSION_IO_EVT_BUILTIN_TX:
1430 case SESSION_IO_EVT_TX_FLUSH:
1431 if (e->session_index == f->master_session_index)
1434 case SESSION_CTRL_EVT_CLOSE:
1436 case SESSION_CTRL_EVT_RPC:
1437 s = session_get_from_handle (e->session_handle);
1440 clib_warning ("session has event but doesn't exist!");
1443 if (s->rx_fifo == f || s->tx_fifo == f)
1453 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e)
1455 session_evt_elt_t *elt;
1456 session_worker_t *wrk;
1457 int i, index, found = 0;
1458 svm_msg_q_msg_t *msg;
1459 svm_msg_q_ring_t *ring;
1464 thread_index = f->master_thread_index;
1465 wrk = session_main_get_worker (thread_index);
1470 mq = wrk->vpp_event_queue;
1471 index = mq->q->head;
1472 for (i = 0; i < mq->q->cursize; i++)
1474 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
1475 ring = svm_msg_q_ring (mq, msg->ring_index);
1476 clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
1477 found = session_node_cmp_event (e, f);
1480 index = (index + 1) % mq->q->maxsize;
1483 * Search pending events vector
1487 clib_llist_foreach (wrk->event_elts, evt_list,
1488 pool_elt_at_index (wrk->event_elts, wrk->new_head),
1490 found = session_node_cmp_event (&elt->evt, f);
1493 clib_memcpy_fast (e, &elt->evt, sizeof (*e));
1500 clib_llist_foreach (wrk->event_elts, evt_list,
1501 pool_elt_at_index (wrk->event_elts, wrk->old_head),
1503 found = session_node_cmp_event (&elt->evt, f);
1506 clib_memcpy_fast (e, &elt->evt, sizeof (*e));
1516 static clib_error_t *
1517 session_queue_exit (vlib_main_t * vm)
1519 if (vec_len (vlib_mains) < 2)
1523 * Shut off (especially) worker-thread session nodes.
1524 * Otherwise, vpp can crash as the main thread unmaps the
1527 vlib_worker_thread_barrier_sync (vm);
1528 session_node_enable_disable (0 /* is_enable */ );
1529 vlib_worker_thread_barrier_release (vm);
1533 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1536 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1539 f64 now, timeout = 1.0;
1540 uword *event_data = 0;
1545 vlib_process_wait_for_event_or_clock (vm, timeout);
1546 now = vlib_time_now (vm);
1547 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1551 case SESSION_Q_PROCESS_FLUSH_FRAMES:
1552 /* Flush the frames by updating all transports times */
1553 transport_update_time (now, 0);
1555 case SESSION_Q_PROCESS_STOP:
1559 /* Timed out. Update time for all transports to trigger all
1560 * outstanding retransmits. */
1561 transport_update_time (now, 0);
1564 vec_reset_length (event_data);
1570 VLIB_REGISTER_NODE (session_queue_process_node) =
1572 .function = session_queue_process,
1573 .type = VLIB_NODE_TYPE_PROCESS,
1574 .name = "session-queue-process",
1575 .state = VLIB_NODE_STATE_DISABLED,
1579 static_always_inline uword
1580 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1581 vlib_frame_t * frame)
1583 session_main_t *sm = &session_main;
1584 if (!sm->wrk[0].vpp_event_queue)
1586 return session_queue_node_fn (vm, node, frame);
1590 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
1592 .function = session_queue_pre_input_inline,
1593 .type = VLIB_NODE_TYPE_PRE_INPUT,
1594 .name = "session-queue-main",
1595 .state = VLIB_NODE_STATE_DISABLED,
1600 * fd.io coding-style-patch-verification: ON
1603 * eval: (c-set-style "gnu")