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/session.h>
22 #include <vnet/session/application.h>
23 #include <vnet/session/application_interface.h>
24 #include <vnet/session/session_debug.h>
25 #include <svm/queue.h>
28 session_mq_accepted_reply_handler (void *data)
30 session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
31 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
35 /* Server isn't interested, kill the session */
38 a->app_index = mp->context;
39 a->handle = mp->handle;
40 vnet_disconnect_session (a);
44 if (session_handle_is_local (mp->handle))
46 ls = application_get_local_session_from_handle (mp->handle);
47 if (!ls || ls->app_wrk_index != mp->context)
49 clib_warning ("server %u doesn't own local handle %llu",
50 mp->context, mp->handle);
53 if (application_local_session_connect_notify (ls))
55 ls->session_state = SESSION_STATE_READY;
59 s = session_get_from_handle_if_valid (mp->handle);
62 clib_warning ("session doesn't exist");
65 if (s->app_wrk_index != mp->context)
67 clib_warning ("app doesn't own session");
70 s->session_state = SESSION_STATE_READY;
71 if (!svm_fifo_is_empty (s->server_rx_fifo))
74 app = app_worker_get (s->app_wrk_index);
75 application_send_event (app, s, FIFO_EVENT_APP_RX);
81 session_mq_reset_reply_handler (void *data)
83 session_reset_reply_msg_t *mp;
84 app_worker_t *app_wrk;
87 u32 index, thread_index;
89 mp = (session_reset_reply_msg_t *) data;
90 app = application_lookup (mp->client_index);
94 session_parse_handle (mp->handle, &index, &thread_index);
95 s = session_get_if_valid (index, thread_index);
98 clib_warning ("Invalid session!");
101 app_wrk = app_worker_get (s->app_wrk_index);
102 if (!app_wrk || app_wrk->app_index != app->app_index)
104 clib_warning ("App % does not own handle 0x%lx!", app->app_index,
109 /* Client objected to resetting the session, log and continue */
112 clib_warning ("client retval %d", mp->retval);
116 /* This comes as a response to a reset, transport only waiting for
117 * confirmation to remove connection state, no need to disconnect */
118 stream_session_cleanup (s);
122 session_mq_disconnected_handler (void *data)
124 session_disconnected_reply_msg_t *rmp;
125 vnet_disconnect_args_t _a, *a = &_a;
126 svm_msg_q_msg_t _msg, *msg = &_msg;
127 session_disconnected_msg_t *mp;
128 app_worker_t *app_wrk;
129 session_event_t *evt;
134 mp = (session_disconnected_msg_t *) data;
135 if (!(s = session_get_from_handle_if_valid (mp->handle)))
137 clib_warning ("could not disconnect handle %llu", mp->handle);
140 app_wrk = app_worker_get (s->app_wrk_index);
141 app = application_lookup (mp->client_index);
142 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
144 clib_warning ("could not disconnect session: %llu app: %u",
145 mp->handle, mp->client_index);
149 a->handle = mp->handle;
150 a->app_index = app_wrk->wrk_index;
151 rv = vnet_disconnect_session (a);
153 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
154 SESSION_MQ_CTRL_EVT_RING,
156 svm_msg_q_unlock (app_wrk->event_queue);
157 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
158 memset (evt, 0, sizeof (*evt));
159 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED;
160 rmp = (session_disconnected_reply_msg_t *) evt->data;
161 rmp->handle = mp->handle;
162 rmp->context = mp->context;
164 svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT);
168 session_mq_disconnected_reply_handler (void *data)
170 session_disconnected_reply_msg_t *mp;
171 vnet_disconnect_args_t _a, *a = &_a;
174 mp = (session_disconnected_reply_msg_t *) data;
176 /* Client objected to disconnecting the session, log and continue */
179 clib_warning ("client retval %d", mp->retval);
183 /* Disconnect has been confirmed. Confirm close to transport */
184 app = application_lookup (mp->context);
187 a->handle = mp->handle;
188 a->app_index = app->app_index;
189 vnet_disconnect_session (a);
193 vlib_node_registration_t session_queue_node;
198 u32 server_thread_index;
199 } session_queue_trace_t;
201 /* packet trace format function */
203 format_session_queue_trace (u8 * s, va_list * args)
205 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
206 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
207 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
209 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
210 t->session_index, t->server_thread_index);
214 #define foreach_session_queue_error \
215 _(TX, "Packets transmitted") \
216 _(TIMER, "Timer events") \
217 _(NO_BUFFER, "Out of buffers")
221 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
222 foreach_session_queue_error
224 SESSION_QUEUE_N_ERROR,
225 } session_queue_error_t;
227 static char *session_queue_error_strings[] = {
228 #define _(sym,string) string,
229 foreach_session_queue_error
235 SESSION_TX_NO_BUFFERS = -2,
241 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
242 u32 next_index, u32 * to_next, u16 n_segs,
243 stream_session_t * s, u32 n_trace)
245 session_queue_trace_t *t;
249 for (i = 0; i < clib_min (n_trace, n_segs); i++)
251 b = vlib_get_buffer (vm, to_next[i - n_segs]);
252 vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
253 t = vlib_add_trace (vm, node, b, sizeof (*t));
254 t->session_index = s->session_index;
255 t->server_thread_index = s->thread_index;
257 vlib_set_trace_count (vm, node, n_trace - i);
261 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
262 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
264 session_manager_main_t *smm = &session_manager_main;
265 vlib_buffer_t *chain_b, *prev_b;
266 u32 chain_bi0, to_deq, left_from_seg;
267 u16 len_to_deq, n_bytes_read;
270 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
271 b->total_length_not_including_first_buffer = 0;
274 left_from_seg = clib_min (ctx->snd_mss - b->current_length,
276 to_deq = left_from_seg;
277 for (j = 1; j < ctx->n_bufs_per_seg; j++)
280 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
283 chain_bi0 = smm->tx_buffers[ctx->s->thread_index][*n_bufs];
284 _vec_len (smm->tx_buffers[ctx->s->thread_index]) = *n_bufs;
286 chain_b = vlib_get_buffer (vm, chain_bi0);
287 chain_b->current_data = 0;
288 data = vlib_buffer_get_current (chain_b);
291 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo,
292 ctx->tx_offset, len_to_deq, data);
293 ctx->tx_offset += n_bytes_read;
297 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
299 svm_fifo_t *f = ctx->s->server_tx_fifo;
300 session_dgram_hdr_t *hdr = &ctx->hdr;
302 deq_now = clib_min (hdr->data_length - hdr->data_offset,
304 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
306 ASSERT (n_bytes_read > 0);
308 hdr->data_offset += n_bytes_read;
309 if (hdr->data_offset == hdr->data_length)
310 svm_fifo_dequeue_drop (f, hdr->data_length);
313 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
316 ASSERT (n_bytes_read == len_to_deq);
317 chain_b->current_length = n_bytes_read;
318 b->total_length_not_including_first_buffer += chain_b->current_length;
320 /* update previous buffer */
321 prev_b->next_buffer = chain_bi0;
322 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
324 /* update current buffer */
325 chain_b->next_buffer = 0;
327 to_deq -= n_bytes_read;
332 && b->total_length_not_including_first_buffer == left_from_seg);
333 ctx->left_to_snd -= left_from_seg;
337 session_output_try_get_buffers (vlib_main_t * vm,
338 session_manager_main_t * smm,
339 u32 thread_index, u16 * n_bufs, u32 wanted)
342 vec_validate_aligned (smm->tx_buffers[thread_index], wanted - 1,
343 CLIB_CACHE_LINE_BYTES);
344 n_alloc = vlib_buffer_alloc (vm, &smm->tx_buffers[thread_index][*n_bufs],
347 _vec_len (smm->tx_buffers[thread_index]) = *n_bufs;
352 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
353 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
360 * Start with the first buffer in chain
363 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
366 data0 = vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
367 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
371 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo, ctx->tx_offset,
373 ASSERT (n_bytes_read > 0);
374 /* Keep track of progress locally, transport is also supposed to
375 * increment it independently when pushing the header */
376 ctx->tx_offset += n_bytes_read;
380 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
382 session_dgram_hdr_t *hdr = &ctx->hdr;
383 svm_fifo_t *f = ctx->s->server_tx_fifo;
387 ASSERT (hdr->data_length > hdr->data_offset);
388 deq_now = clib_min (hdr->data_length - hdr->data_offset,
390 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
391 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
392 ASSERT (n_bytes_read > 0);
394 if (ctx->s->session_state == SESSION_STATE_LISTENING)
396 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
397 ctx->tc->rmt_port = hdr->rmt_port;
399 hdr->data_offset += n_bytes_read;
400 if (hdr->data_offset == hdr->data_length)
402 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
403 svm_fifo_dequeue_drop (f, offset);
408 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
410 ASSERT (n_bytes_read > 0);
413 b->current_length = n_bytes_read;
414 ctx->left_to_snd -= n_bytes_read;
417 * Fill in the remaining buffers in the chain, if any
419 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
420 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
423 SESSION_EVT_DBG(SESSION_EVT_DEQ, ctx->s, ({
424 ed->data[0] = FIFO_EVENT_APP_TX;
425 ed->data[1] = ctx->max_dequeue;
426 ed->data[2] = len_to_deq;
427 ed->data[3] = ctx->left_to_snd;
433 session_tx_not_ready (stream_session_t * s, u8 peek_data)
437 /* Can retransmit for closed sessions but can't send new data if
438 * session is not ready or closed */
439 if (s->session_state < SESSION_STATE_READY)
441 if (s->session_state == SESSION_STATE_CLOSED)
447 always_inline transport_connection_t *
448 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
452 return ctx->transport_vft->get_connection (ctx->s->connection_index,
453 ctx->s->thread_index);
457 if (ctx->s->session_state == SESSION_STATE_LISTENING)
458 return ctx->transport_vft->get_listener (ctx->s->connection_index);
461 return ctx->transport_vft->get_connection (ctx->s->connection_index,
462 ctx->s->thread_index);
468 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
469 u32 max_segs, u8 peek_data)
471 u32 n_bytes_per_buf, n_bytes_per_seg;
472 ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo);
475 /* Offset in rx fifo from where to peek data */
476 ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
477 if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
479 ctx->max_len_to_snd = 0;
482 ctx->max_dequeue -= ctx->tx_offset;
486 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
488 if (ctx->max_dequeue <= sizeof (ctx->hdr))
490 ctx->max_len_to_snd = 0;
493 svm_fifo_peek (ctx->s->server_tx_fifo, 0, sizeof (ctx->hdr),
495 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
496 ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
499 ASSERT (ctx->max_dequeue > 0);
501 /* Ensure we're not writing more than transport window allows */
502 if (ctx->max_dequeue < ctx->snd_space)
504 /* Constrained by tx queue. Try to send only fully formed segments */
505 ctx->max_len_to_snd =
506 (ctx->max_dequeue > ctx->snd_mss) ?
507 ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
512 /* Expectation is that snd_space0 is already a multiple of snd_mss */
513 ctx->max_len_to_snd = ctx->snd_space;
516 /* Check if we're tx constrained by the node */
517 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
518 if (ctx->n_segs_per_evt > max_segs)
520 ctx->n_segs_per_evt = max_segs;
521 ctx->max_len_to_snd = max_segs * ctx->snd_mss;
524 n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm,
525 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
526 ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
527 n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss;
528 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
529 ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
530 ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
531 n_bytes_per_buf - MAX_HDRS_LEN);
535 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
537 stream_session_t * s, int *n_tx_packets,
540 u32 next_index, next0, next1, *to_next, n_left_to_next;
541 u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
542 u32 thread_index = s->thread_index, n_left, pbi;
543 session_manager_main_t *smm = &session_manager_main;
544 session_tx_context_t *ctx = &smm->ctx[thread_index];
545 transport_proto_t tp;
549 if (PREDICT_FALSE ((rv = session_tx_not_ready (s, peek_data))))
552 vec_add1 (smm->pending_event_vector[thread_index], *e);
553 return SESSION_TX_NO_DATA;
556 next_index = smm->session_type_to_next[s->session_type];
557 next0 = next1 = next_index;
559 tp = session_get_transport_proto (s);
561 ctx->transport_vft = transport_protocol_get_vft (tp);
562 ctx->tc = session_tx_get_transport (ctx, peek_data);
563 ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
564 ctx->snd_space = ctx->transport_vft->send_space (ctx->tc);
565 if (ctx->snd_space == 0 || ctx->snd_mss == 0)
567 vec_add1 (smm->pending_event_vector[thread_index], *e);
568 return SESSION_TX_NO_DATA;
571 /* Allow enqueuing of a new event */
572 svm_fifo_unset_event (s->server_tx_fifo);
574 /* Check how much we can pull. */
575 session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
578 if (PREDICT_FALSE (!ctx->max_len_to_snd))
579 return SESSION_TX_NO_DATA;
581 n_bufs = vec_len (smm->tx_buffers[thread_index]);
582 n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
585 * Make sure we have at least one full frame of buffers ready
587 if (n_bufs < n_bufs_needed)
589 session_output_try_get_buffers (vm, smm, thread_index, &n_bufs,
590 ctx->n_bufs_per_seg * VLIB_FRAME_SIZE);
591 if (PREDICT_FALSE (n_bufs < n_bufs_needed))
593 vec_add1 (smm->pending_event_vector[thread_index], *e);
594 return SESSION_TX_NO_BUFFERS;
599 * Write until we fill up a frame
601 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
602 if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
604 ctx->n_segs_per_evt = n_left_to_next;
605 ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
607 ctx->left_to_snd = ctx->max_len_to_snd;
608 n_left = ctx->n_segs_per_evt;
612 vlib_buffer_t *b0, *b1;
615 pbi = smm->tx_buffers[thread_index][n_bufs - 3];
616 pb = vlib_get_buffer (vm, pbi);
617 vlib_prefetch_buffer_header (pb, STORE);
618 pbi = smm->tx_buffers[thread_index][n_bufs - 4];
619 pb = vlib_get_buffer (vm, pbi);
620 vlib_prefetch_buffer_header (pb, STORE);
622 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
623 to_next[1] = bi1 = smm->tx_buffers[thread_index][--n_bufs];
625 b0 = vlib_get_buffer (vm, bi0);
626 b1 = vlib_get_buffer (vm, bi1);
628 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
629 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
631 ctx->transport_vft->push_header (ctx->tc, b0);
632 ctx->transport_vft->push_header (ctx->tc, b1);
638 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
639 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
641 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
642 n_left_to_next, bi0, bi1, next0,
652 pbi = smm->tx_buffers[thread_index][n_bufs - 2];
653 pb = vlib_get_buffer (vm, pbi);
654 vlib_prefetch_buffer_header (pb, STORE);
657 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
658 b0 = vlib_get_buffer (vm, bi0);
659 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
661 /* Ask transport to push header after current_length and
662 * total_length_not_including_first_buffer are updated */
663 ctx->transport_vft->push_header (ctx->tc, b0);
669 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
671 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
672 n_left_to_next, bi0, next0);
675 if (PREDICT_FALSE (n_trace > 0))
676 session_tx_trace_frame (vm, node, next_index, to_next,
677 ctx->n_segs_per_evt, s, n_trace);
679 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
680 *n_tx_packets += ctx->n_segs_per_evt;
681 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
683 /* If we couldn't dequeue all bytes mark as partially read */
684 ASSERT (ctx->left_to_snd == 0);
685 if (ctx->max_len_to_snd < ctx->max_dequeue)
686 if (svm_fifo_set_event (s->server_tx_fifo))
687 vec_add1 (smm->pending_event_vector[thread_index], *e);
689 if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
691 /* Fix dgram pre header */
692 if (ctx->max_len_to_snd < ctx->max_dequeue)
693 svm_fifo_overwrite_head (s->server_tx_fifo, (u8 *) & ctx->hdr,
694 sizeof (session_dgram_pre_hdr_t));
695 /* More data needs to be read */
696 else if (svm_fifo_max_dequeue (s->server_tx_fifo) > 0)
697 if (svm_fifo_set_event (s->server_tx_fifo))
698 vec_add1 (smm->pending_event_vector[thread_index], *e);
700 return SESSION_TX_OK;
704 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
706 stream_session_t * s, int *n_tx_pkts)
708 return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 1);
712 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
714 stream_session_t * s, int *n_tx_pkts)
716 return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 0);
720 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
721 vlib_node_runtime_t * node,
723 stream_session_t * s, int *n_tx_pkts)
726 app = application_get (s->opaque);
727 svm_fifo_unset_event (s->server_tx_fifo);
728 return app->cb_fns.builtin_app_tx_callback (s);
731 always_inline stream_session_t *
732 session_event_get_session (session_event_t * e, u8 thread_index)
734 return session_get_if_valid (e->fifo->master_session_index, thread_index);
738 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
739 vlib_frame_t * frame)
741 session_manager_main_t *smm = vnet_get_session_manager_main ();
742 u32 thread_index = vm->thread_index, n_to_dequeue, n_events;
743 session_event_t *pending_events, *e;
744 session_event_t *fifo_events;
745 svm_msg_q_msg_t _msg, *msg = &_msg;
746 f64 now = vlib_time_now (vm);
747 int n_tx_packets = 0, i, rv;
748 app_worker_t *app_wrk;
753 SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
756 * Update transport time
758 transport_update_time (now, thread_index);
761 * Get vpp queue events that we can dequeue without blocking
763 mq = smm->vpp_event_queues[thread_index];
764 fifo_events = smm->free_event_vector[thread_index];
765 n_to_dequeue = svm_msg_q_size (mq);
766 pending_events = smm->pending_event_vector[thread_index];
768 if (!n_to_dequeue && !vec_len (pending_events)
769 && !vec_len (smm->pending_disconnects[thread_index]))
772 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
775 * If we didn't manage to process previous events try going
776 * over them again without dequeuing new ones.
777 * XXX: Handle senders to sessions that can't keep up
779 if (0 && vec_len (pending_events) >= 100)
781 clib_warning ("too many fifo events unsolved");
785 /* See you in the next life, don't be late
786 * XXX: we may need priorities here */
787 if (svm_msg_q_try_lock (mq))
790 for (i = 0; i < n_to_dequeue; i++)
792 vec_add2 (fifo_events, e, 1);
793 svm_msg_q_sub_w_lock (mq, msg);
794 clib_memcpy (e, svm_msg_q_msg_data (mq, msg), sizeof (*e));
795 svm_msg_q_free_msg (mq, msg);
798 svm_msg_q_unlock (mq);
800 vec_append (fifo_events, pending_events);
801 vec_append (fifo_events, smm->pending_disconnects[thread_index]);
803 _vec_len (pending_events) = 0;
804 smm->pending_event_vector[thread_index] = pending_events;
805 _vec_len (smm->pending_disconnects[thread_index]) = 0;
808 n_events = vec_len (fifo_events);
809 for (i = 0; i < n_events; i++)
811 stream_session_t *s; /* $$$ prefetch 1 ahead maybe */
816 switch (e->event_type)
818 case FIFO_EVENT_APP_TX:
819 /* Don't try to send more that one frame per dispatch cycle */
820 if (n_tx_packets == VLIB_FRAME_SIZE)
822 vec_add1 (smm->pending_event_vector[thread_index], *e);
826 s = session_event_get_session (e, thread_index);
827 if (PREDICT_FALSE (!s))
829 clib_warning ("It's dead, Jim!");
832 is_full = svm_fifo_is_full (s->server_tx_fifo);
834 /* Spray packets in per session type frames, since they go to
836 rv = (smm->session_tx_fns[s->session_type]) (vm, node, e, s,
838 if (PREDICT_TRUE (rv == SESSION_TX_OK))
840 /* Notify app there's tx space if not polling */
841 if (PREDICT_FALSE (is_full
842 && !svm_fifo_has_event (s->server_tx_fifo)))
843 session_dequeue_notify (s);
845 else if (PREDICT_FALSE (rv == SESSION_TX_NO_BUFFERS))
847 vlib_node_increment_counter (vm, node->node_index,
848 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
852 case FIFO_EVENT_DISCONNECT:
853 /* Make sure stream disconnects run after the pending list is
855 s = session_get_from_handle (e->session_handle);
859 vec_add1 (smm->pending_disconnects[thread_index], *e);
862 /* If tx queue is still not empty, wait */
863 if (svm_fifo_max_dequeue (s->server_tx_fifo))
865 vec_add1 (smm->pending_disconnects[thread_index], *e);
869 stream_session_disconnect_transport (s);
871 case FIFO_EVENT_BUILTIN_RX:
872 s = session_event_get_session (e, thread_index);
873 if (PREDICT_FALSE (!s))
875 svm_fifo_unset_event (s->server_rx_fifo);
876 app_wrk = app_worker_get (s->app_wrk_index);
877 app = application_get (app_wrk->app_index);
878 app->cb_fns.builtin_app_rx_callback (s);
882 (*fp) (e->rpc_args.arg);
884 case SESSION_CTRL_EVT_DISCONNECTED:
885 session_mq_disconnected_handler (e->data);
887 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
888 session_mq_accepted_reply_handler (e->data);
890 case SESSION_CTRL_EVT_CONNECTED_REPLY:
892 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
893 session_mq_disconnected_reply_handler (e->data);
895 case SESSION_CTRL_EVT_RESET_REPLY:
896 session_mq_reset_reply_handler (e->data);
899 clib_warning ("unhandled event type %d", e->event_type);
903 _vec_len (fifo_events) = 0;
904 smm->free_event_vector[thread_index] = fifo_events;
906 vlib_node_increment_counter (vm, session_queue_node.index,
907 SESSION_QUEUE_ERROR_TX, n_tx_packets);
909 SESSION_EVT_DBG (SESSION_EVT_DISPATCH_END, smm, thread_index);
915 VLIB_REGISTER_NODE (session_queue_node) =
917 .function = session_queue_node_fn,
918 .name = "session-queue",
919 .format_trace = format_session_queue_trace,
920 .type = VLIB_NODE_TYPE_INPUT,
921 .n_errors = ARRAY_LEN (session_queue_error_strings),
922 .error_strings = session_queue_error_strings,
923 .state = VLIB_NODE_STATE_DISABLED,
928 dump_thread_0_event_queue (void)
930 session_manager_main_t *smm = vnet_get_session_manager_main ();
931 vlib_main_t *vm = &vlib_global_main;
932 u32 my_thread_index = vm->thread_index;
933 session_event_t _e, *e = &_e;
934 svm_msg_q_ring_t *ring;
935 stream_session_t *s0;
936 svm_msg_q_msg_t *msg;
940 mq = smm->vpp_event_queues[my_thread_index];
943 for (i = 0; i < mq->q->cursize; i++)
945 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
946 ring = svm_msg_q_ring (mq, msg->ring_index);
947 clib_memcpy (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
949 switch (e->event_type)
951 case FIFO_EVENT_APP_TX:
952 s0 = session_event_get_session (e, my_thread_index);
953 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
956 case FIFO_EVENT_DISCONNECT:
957 s0 = session_get_from_handle (e->session_handle);
958 fformat (stdout, "[%04d] disconnect session %d\n", i,
962 case FIFO_EVENT_BUILTIN_RX:
963 s0 = session_event_get_session (e, my_thread_index);
964 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
968 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
969 i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg));
973 fformat (stdout, "[%04d] unhandled event type %d\n",
980 if (index == mq->q->maxsize)
986 session_node_cmp_event (session_event_t * e, svm_fifo_t * f)
989 switch (e->event_type)
991 case FIFO_EVENT_APP_RX:
992 case FIFO_EVENT_APP_TX:
993 case FIFO_EVENT_BUILTIN_RX:
997 case FIFO_EVENT_DISCONNECT:
1000 s = session_get_from_handle (e->session_handle);
1003 clib_warning ("session has event but doesn't exist!");
1006 if (s->server_rx_fifo == f || s->server_tx_fifo == f)
1016 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e)
1018 session_manager_main_t *smm = vnet_get_session_manager_main ();
1020 session_event_t *pending_event_vector, *evt;
1021 int i, index, found = 0;
1022 svm_msg_q_msg_t *msg;
1023 svm_msg_q_ring_t *ring;
1027 thread_index = f->master_thread_index;
1031 mq = smm->vpp_event_queues[thread_index];
1032 index = mq->q->head;
1033 for (i = 0; i < mq->q->cursize; i++)
1035 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
1036 ring = svm_msg_q_ring (mq, msg->ring_index);
1037 clib_memcpy (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
1038 found = session_node_cmp_event (e, f);
1041 if (++index == mq->q->maxsize)
1045 * Search pending events vector
1047 pending_event_vector = smm->pending_event_vector[thread_index];
1048 vec_foreach (evt, pending_event_vector)
1050 found = session_node_cmp_event (evt, f);
1053 clib_memcpy (e, evt, sizeof (*evt));
1060 static clib_error_t *
1061 session_queue_exit (vlib_main_t * vm)
1063 if (vec_len (vlib_mains) < 2)
1067 * Shut off (especially) worker-thread session nodes.
1068 * Otherwise, vpp can crash as the main thread unmaps the
1071 vlib_worker_thread_barrier_sync (vm);
1072 session_node_enable_disable (0 /* is_enable */ );
1073 vlib_worker_thread_barrier_release (vm);
1077 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1080 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1083 f64 now, timeout = 1.0;
1084 uword *event_data = 0;
1089 vlib_process_wait_for_event_or_clock (vm, timeout);
1090 now = vlib_time_now (vm);
1091 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1095 case SESSION_Q_PROCESS_FLUSH_FRAMES:
1096 /* Flush the frames by updating all transports times */
1097 transport_update_time (now, 0);
1099 case SESSION_Q_PROCESS_STOP:
1103 /* Timed out. Update time for all transports to trigger all
1104 * outstanding retransmits. */
1105 transport_update_time (now, 0);
1108 vec_reset_length (event_data);
1114 VLIB_REGISTER_NODE (session_queue_process_node) =
1116 .function = session_queue_process,
1117 .type = VLIB_NODE_TYPE_PROCESS,
1118 .name = "session-queue-process",
1119 .state = VLIB_NODE_STATE_DISABLED,
1125 * fd.io coding-style-patch-verification: ON
1128 * eval: (c-set-style "gnu")