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/session_debug.h>
24 #include <svm/queue.h>
26 vlib_node_registration_t session_queue_node;
31 u32 server_thread_index;
32 } session_queue_trace_t;
34 /* packet trace format function */
36 format_session_queue_trace (u8 * s, va_list * args)
38 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
39 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
40 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
42 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
43 t->session_index, t->server_thread_index);
47 vlib_node_registration_t session_queue_node;
49 #define foreach_session_queue_error \
50 _(TX, "Packets transmitted") \
51 _(TIMER, "Timer events") \
52 _(NO_BUFFER, "Out of buffers")
56 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
57 foreach_session_queue_error
59 SESSION_QUEUE_N_ERROR,
60 } session_queue_error_t;
62 static char *session_queue_error_strings[] = {
63 #define _(sym,string) string,
64 foreach_session_queue_error
69 session_tx_trace_buffer (vlib_main_t * vm, vlib_node_runtime_t * node,
70 u32 next_index, vlib_buffer_t * b,
71 stream_session_t * s, u32 * n_trace)
73 session_queue_trace_t *t;
74 vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
75 vlib_set_trace_count (vm, node, --*n_trace);
76 t = vlib_add_trace (vm, node, b, sizeof (*t));
77 t->session_index = s->session_index;
78 t->server_thread_index = s->thread_index;
82 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
83 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
85 session_manager_main_t *smm = &session_manager_main;
86 vlib_buffer_t *chain_b, *prev_b;
87 u32 chain_bi0, to_deq, left_from_seg;
88 u16 len_to_deq, n_bytes_read;
91 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
92 b->total_length_not_including_first_buffer = 0;
95 left_from_seg = clib_min (ctx->snd_mss - b->current_length,
97 to_deq = left_from_seg;
98 for (j = 1; j < ctx->n_bufs_per_seg; j++)
101 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
104 chain_bi0 = smm->tx_buffers[ctx->s->thread_index][*n_bufs];
105 _vec_len (smm->tx_buffers[ctx->s->thread_index]) = *n_bufs;
107 chain_b = vlib_get_buffer (vm, chain_bi0);
108 chain_b->current_data = 0;
109 data = vlib_buffer_get_current (chain_b);
112 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo,
113 ctx->tx_offset, len_to_deq, data);
114 ctx->tx_offset += n_bytes_read;
118 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
120 svm_fifo_t *f = ctx->s->server_tx_fifo;
121 session_dgram_hdr_t *hdr = &ctx->hdr;
123 deq_now = clib_min (hdr->data_length - hdr->data_offset,
125 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
127 ASSERT (n_bytes_read > 0);
129 hdr->data_offset += n_bytes_read;
130 if (hdr->data_offset == hdr->data_length)
131 svm_fifo_dequeue_drop (f, hdr->data_length);
134 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
137 ASSERT (n_bytes_read == len_to_deq);
138 chain_b->current_length = n_bytes_read;
139 b->total_length_not_including_first_buffer += chain_b->current_length;
141 /* update previous buffer */
142 prev_b->next_buffer = chain_bi0;
143 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
145 /* update current buffer */
146 chain_b->next_buffer = 0;
148 to_deq -= n_bytes_read;
153 && b->total_length_not_including_first_buffer == left_from_seg);
154 ctx->left_to_snd -= left_from_seg;
158 session_output_try_get_buffers (vlib_main_t * vm,
159 session_manager_main_t * smm,
160 u32 thread_index, u16 * n_bufs, u32 wanted)
163 vec_validate_aligned (smm->tx_buffers[thread_index], wanted - 1,
164 CLIB_CACHE_LINE_BYTES);
165 n_alloc = vlib_buffer_alloc (vm, &smm->tx_buffers[thread_index][*n_bufs],
168 _vec_len (smm->tx_buffers[thread_index]) = *n_bufs;
173 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
174 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
181 * Start with the first buffer in chain
184 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
186 b->total_length_not_including_first_buffer = 0;
188 data0 = vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
189 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
193 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo, ctx->tx_offset,
195 ASSERT (n_bytes_read > 0);
196 /* Keep track of progress locally, transport is also supposed to
197 * increment it independently when pushing the header */
198 ctx->tx_offset += n_bytes_read;
202 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
204 session_dgram_hdr_t *hdr = &ctx->hdr;
205 svm_fifo_t *f = ctx->s->server_tx_fifo;
209 ASSERT (hdr->data_length > hdr->data_offset);
210 deq_now = clib_min (hdr->data_length - hdr->data_offset,
212 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
213 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
214 ASSERT (n_bytes_read > 0);
216 if (ctx->s->session_state == SESSION_STATE_LISTENING)
218 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
219 ctx->tc->rmt_port = hdr->rmt_port;
221 hdr->data_offset += n_bytes_read;
222 if (hdr->data_offset == hdr->data_length)
224 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
225 svm_fifo_dequeue_drop (f, offset);
230 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
232 ASSERT (n_bytes_read > 0);
235 b->current_length = n_bytes_read;
236 ctx->left_to_snd -= n_bytes_read;
239 * Fill in the remaining buffers in the chain, if any
241 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
242 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
245 SESSION_EVT_DBG(SESSION_EVT_DEQ, s, ({
246 ed->data[0] = e->event_type;
247 ed->data[1] = max_dequeue;
248 ed->data[2] = len_to_deq;
249 ed->data[3] = left_to_snd;
255 session_tx_not_ready (stream_session_t * s, u8 peek_data)
259 /* Can retransmit for closed sessions but can't send new data if
260 * session is not ready or closed */
261 if (s->session_state < SESSION_STATE_READY)
267 always_inline transport_connection_t *
268 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
272 return ctx->transport_vft->get_connection (ctx->s->connection_index,
273 ctx->s->thread_index);
277 if (ctx->s->session_state == SESSION_STATE_LISTENING)
278 return ctx->transport_vft->get_listener (ctx->s->connection_index);
281 return ctx->transport_vft->get_connection (ctx->s->connection_index,
282 ctx->s->thread_index);
288 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
289 u32 max_segs, u8 peek_data)
291 u32 n_bytes_per_buf, n_bytes_per_seg;
292 ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo);
295 /* Offset in rx fifo from where to peek data */
296 ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
297 if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
299 ctx->max_len_to_snd = 0;
302 ctx->max_dequeue -= ctx->tx_offset;
306 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
308 if (ctx->max_dequeue <= sizeof (ctx->hdr))
310 ctx->max_len_to_snd = 0;
313 svm_fifo_peek (ctx->s->server_tx_fifo, 0, sizeof (ctx->hdr),
315 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
316 ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
319 ASSERT (ctx->max_dequeue > 0);
321 /* Ensure we're not writing more than transport window allows */
322 if (ctx->max_dequeue < ctx->snd_space)
324 /* Constrained by tx queue. Try to send only fully formed segments */
325 ctx->max_len_to_snd =
326 (ctx->max_dequeue > ctx->snd_mss) ?
327 ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
332 /* Expectation is that snd_space0 is already a multiple of snd_mss */
333 ctx->max_len_to_snd = ctx->snd_space;
336 /* Check if we're tx constrained by the node */
337 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
338 if (ctx->n_segs_per_evt > max_segs)
340 ctx->n_segs_per_evt = max_segs;
341 ctx->max_len_to_snd = max_segs * ctx->snd_mss;
344 n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm,
345 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
346 ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
347 n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss;
348 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
349 ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
350 ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
351 n_bytes_per_buf - MAX_HDRS_LEN);
355 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
356 session_fifo_event_t * e,
357 stream_session_t * s, int *n_tx_packets,
360 u32 next_index, next0, next1, next2, next3, *to_next, n_left_to_next;
361 u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
362 u32 thread_index = s->thread_index, n_left, pbi;
363 session_manager_main_t *smm = &session_manager_main;
364 session_tx_context_t *ctx = &smm->ctx[thread_index];
365 transport_proto_t tp;
369 if (PREDICT_FALSE (session_tx_not_ready (s, peek_data)))
371 vec_add1 (smm->pending_event_vector[thread_index], *e);
375 next_index = smm->session_type_to_next[s->session_type];
376 next0 = next1 = next2 = next3 = next_index;
378 tp = session_get_transport_proto (s);
380 ctx->transport_vft = transport_protocol_get_vft (tp);
381 ctx->tc = session_tx_get_transport (ctx, peek_data);
382 ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
383 ctx->snd_space = ctx->transport_vft->send_space (ctx->tc);
384 if (ctx->snd_space == 0 || ctx->snd_mss == 0)
386 vec_add1 (smm->pending_event_vector[thread_index], *e);
390 /* Allow enqueuing of a new event */
391 svm_fifo_unset_event (s->server_tx_fifo);
393 /* Check how much we can pull. */
394 session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
397 if (PREDICT_FALSE (!ctx->max_len_to_snd))
400 n_bufs = vec_len (smm->tx_buffers[thread_index]);
401 n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
404 * Make sure we have at least one full frame of buffers ready
406 if (n_bufs < n_bufs_needed)
408 session_output_try_get_buffers (vm, smm, thread_index, &n_bufs,
409 ctx->n_bufs_per_seg * VLIB_FRAME_SIZE);
410 if (PREDICT_FALSE (n_bufs < n_bufs_needed))
412 vec_add1 (smm->pending_event_vector[thread_index], *e);
418 * Write until we fill up a frame
420 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
421 if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
423 ctx->n_segs_per_evt = n_left_to_next;
424 ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
426 ctx->left_to_snd = ctx->max_len_to_snd;
427 n_left = ctx->n_segs_per_evt;
432 vlib_buffer_t *b0, *b1;
435 pbi = smm->tx_buffers[thread_index][n_bufs - 3];
436 pb = vlib_get_buffer (vm, pbi);
437 vlib_prefetch_buffer_header (pb, STORE);
438 pbi = smm->tx_buffers[thread_index][n_bufs - 4];
439 pb = vlib_get_buffer (vm, pbi);
440 vlib_prefetch_buffer_header (pb, STORE);
442 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
443 to_next[1] = bi1 = smm->tx_buffers[thread_index][--n_bufs];
445 b0 = vlib_get_buffer (vm, bi0);
446 b1 = vlib_get_buffer (vm, bi1);
448 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
449 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
451 ctx->transport_vft->push_header (ctx->tc, b0);
452 ctx->transport_vft->push_header (ctx->tc, b1);
458 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
459 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
461 if (PREDICT_FALSE (n_trace > 0))
463 session_tx_trace_buffer (vm, node, next_index, b0, s, &n_trace);
465 session_tx_trace_buffer (vm, node, next_index, b1, s,
469 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
470 n_left_to_next, bi0, bi1,
478 ASSERT (n_bufs >= 1);
479 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
480 b0 = vlib_get_buffer (vm, bi0);
481 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
483 /* Ask transport to push header after current_length and
484 * total_length_not_including_first_buffer are updated */
485 ctx->transport_vft->push_header (ctx->tc, b0);
491 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
492 if (PREDICT_FALSE (n_trace > 0))
493 session_tx_trace_buffer (vm, node, next_index, b0, s, &n_trace);
495 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
496 n_left_to_next, bi0, next0);
499 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
500 *n_tx_packets += ctx->n_segs_per_evt;
501 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
503 /* If we couldn't dequeue all bytes mark as partially read */
504 ASSERT (ctx->left_to_snd == 0);
505 if (ctx->max_len_to_snd < ctx->max_dequeue)
506 if (svm_fifo_set_event (s->server_tx_fifo))
507 vec_add1 (smm->pending_event_vector[thread_index], *e);
509 if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
511 /* Fix dgram pre header */
512 if (ctx->max_len_to_snd < ctx->max_dequeue)
513 svm_fifo_overwrite_head (s->server_tx_fifo, (u8 *) & ctx->hdr,
514 sizeof (session_dgram_pre_hdr_t));
515 /* More data needs to be read */
516 else if (svm_fifo_max_dequeue (s->server_tx_fifo) > 0)
517 if (svm_fifo_set_event (s->server_tx_fifo))
518 vec_add1 (smm->pending_event_vector[thread_index], *e);
524 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
525 session_fifo_event_t * e0,
526 stream_session_t * s0, int *n_tx_pkts)
528 return session_tx_fifo_read_and_snd_i (vm, node, e0, s0, n_tx_pkts, 1);
532 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
533 session_fifo_event_t * e0,
534 stream_session_t * s0, int *n_tx_pkts)
536 return session_tx_fifo_read_and_snd_i (vm, node, e0, s0, n_tx_pkts, 0);
540 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
541 vlib_node_runtime_t * node,
542 session_fifo_event_t * e0,
543 stream_session_t * s0, int *n_tx_pkts)
546 app = application_get (s0->opaque);
547 svm_fifo_unset_event (s0->server_tx_fifo);
548 return app->cb_fns.builtin_app_tx_callback (s0);
551 always_inline stream_session_t *
552 session_event_get_session (session_fifo_event_t * e, u8 thread_index)
554 return session_get_if_valid (e->fifo->master_session_index, thread_index);
558 dump_thread_0_event_queue (void)
560 session_manager_main_t *smm = vnet_get_session_manager_main ();
561 vlib_main_t *vm = &vlib_global_main;
562 u32 my_thread_index = vm->thread_index;
563 session_fifo_event_t _e, *e = &_e;
564 stream_session_t *s0;
569 q = smm->vpp_event_queues[my_thread_index];
573 for (i = 0; i < q->cursize; i++)
575 headp = (i8 *) (&q->data[0] + q->elsize * index);
576 clib_memcpy (e, headp, q->elsize);
578 switch (e->event_type)
580 case FIFO_EVENT_APP_TX:
581 s0 = session_event_get_session (e, my_thread_index);
582 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
585 case FIFO_EVENT_DISCONNECT:
586 s0 = session_get_from_handle (e->session_handle);
587 fformat (stdout, "[%04d] disconnect session %d\n", i,
591 case FIFO_EVENT_BUILTIN_RX:
592 s0 = session_event_get_session (e, my_thread_index);
593 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
597 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
598 i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg));
602 fformat (stdout, "[%04d] unhandled event type %d\n",
609 if (index == q->maxsize)
615 session_node_cmp_event (session_fifo_event_t * e, svm_fifo_t * f)
618 switch (e->event_type)
620 case FIFO_EVENT_APP_RX:
621 case FIFO_EVENT_APP_TX:
622 case FIFO_EVENT_BUILTIN_RX:
626 case FIFO_EVENT_DISCONNECT:
629 s = session_get_from_handle (e->session_handle);
632 clib_warning ("session has event but doesn't exist!");
635 if (s->server_rx_fifo == f || s->server_tx_fifo == f)
645 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e)
647 session_manager_main_t *smm = vnet_get_session_manager_main ();
649 session_fifo_event_t *pending_event_vector, *evt;
650 int i, index, found = 0;
655 thread_index = f->master_thread_index;
659 q = smm->vpp_event_queues[thread_index];
661 for (i = 0; i < q->cursize; i++)
663 headp = (i8 *) (&q->data[0] + q->elsize * index);
664 clib_memcpy (e, headp, q->elsize);
665 found = session_node_cmp_event (e, f);
668 if (++index == q->maxsize)
672 * Search pending events vector
674 pending_event_vector = smm->pending_event_vector[thread_index];
675 vec_foreach (evt, pending_event_vector)
677 found = session_node_cmp_event (evt, f);
680 clib_memcpy (e, evt, sizeof (*evt));
688 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
689 vlib_frame_t * frame)
691 session_manager_main_t *smm = vnet_get_session_manager_main ();
692 session_fifo_event_t *my_pending_event_vector, *pending_disconnects, *e;
693 session_fifo_event_t *my_fifo_events;
694 u32 n_to_dequeue, n_events;
697 int n_tx_packets = 0;
698 u32 thread_index = vm->thread_index;
700 f64 now = vlib_time_now (vm);
703 SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
706 * Update transport time
708 transport_update_time (now, thread_index);
711 * Get vpp queue events
713 q = smm->vpp_event_queues[thread_index];
714 if (PREDICT_FALSE (q == 0))
717 my_fifo_events = smm->free_event_vector[thread_index];
719 /* min number of events we can dequeue without blocking */
720 n_to_dequeue = q->cursize;
721 my_pending_event_vector = smm->pending_event_vector[thread_index];
722 pending_disconnects = smm->pending_disconnects[thread_index];
724 if (!n_to_dequeue && !vec_len (my_pending_event_vector)
725 && !vec_len (pending_disconnects))
728 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
731 * If we didn't manage to process previous events try going
732 * over them again without dequeuing new ones.
734 /* XXX: Block senders to sessions that can't keep up */
735 if (0 && vec_len (my_pending_event_vector) >= 100)
737 clib_warning ("too many fifo events unsolved");
741 /* See you in the next life, don't be late */
742 if (pthread_mutex_trylock (&q->mutex))
745 for (i = 0; i < n_to_dequeue; i++)
747 vec_add2 (my_fifo_events, e, 1);
748 svm_queue_sub_raw (q, (u8 *) e);
751 /* The other side of the connection is not polling */
752 if (q->cursize < (q->maxsize / 8))
753 (void) pthread_cond_broadcast (&q->condvar);
754 pthread_mutex_unlock (&q->mutex);
756 vec_append (my_fifo_events, my_pending_event_vector);
757 vec_append (my_fifo_events, smm->pending_disconnects[thread_index]);
759 _vec_len (my_pending_event_vector) = 0;
760 smm->pending_event_vector[thread_index] = my_pending_event_vector;
761 _vec_len (smm->pending_disconnects[thread_index]) = 0;
764 n_events = vec_len (my_fifo_events);
765 for (i = 0; i < n_events; i++)
767 stream_session_t *s0; /* $$$ prefetch 1 ahead maybe */
768 session_fifo_event_t *e0;
770 e0 = &my_fifo_events[i];
771 switch (e0->event_type)
773 case FIFO_EVENT_APP_TX:
774 if (n_tx_packets == VLIB_FRAME_SIZE)
776 vec_add1 (smm->pending_event_vector[thread_index], *e0);
780 s0 = session_event_get_session (e0, thread_index);
781 if (PREDICT_FALSE (!s0))
783 clib_warning ("It's dead, Jim!");
787 /* Spray packets in per session type frames, since they go to
789 rv = (smm->session_tx_fns[s0->session_type]) (vm, node, e0, s0,
792 if (PREDICT_FALSE (rv < 0))
794 vlib_node_increment_counter (vm, node->node_index,
795 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
799 case FIFO_EVENT_DISCONNECT:
800 /* Make sure stream disconnects run after the pending list is drained */
801 s0 = session_get_from_handle (e0->session_handle);
802 if (!e0->postponed || svm_fifo_max_dequeue (s0->server_tx_fifo))
805 vec_add1 (smm->pending_disconnects[thread_index], *e0);
809 stream_session_disconnect_transport (s0);
811 case FIFO_EVENT_BUILTIN_RX:
812 s0 = session_event_get_session (e0, thread_index);
813 if (PREDICT_FALSE (!s0))
815 svm_fifo_unset_event (s0->server_rx_fifo);
816 app = application_get (s0->app_index);
817 app->cb_fns.builtin_app_rx_callback (s0);
820 fp = e0->rpc_args.fp;
821 (*fp) (e0->rpc_args.arg);
825 clib_warning ("unhandled event type %d", e0->event_type);
829 _vec_len (my_fifo_events) = 0;
830 smm->free_event_vector[thread_index] = my_fifo_events;
832 vlib_node_increment_counter (vm, session_queue_node.index,
833 SESSION_QUEUE_ERROR_TX, n_tx_packets);
835 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 1);
841 VLIB_REGISTER_NODE (session_queue_node) =
843 .function = session_queue_node_fn,
844 .name = "session-queue",
845 .format_trace = format_session_queue_trace,
846 .type = VLIB_NODE_TYPE_INPUT,
847 .n_errors = ARRAY_LEN (session_queue_error_strings),
848 .error_strings = session_queue_error_strings,
849 .state = VLIB_NODE_STATE_DISABLED,
853 static clib_error_t *
854 session_queue_exit (vlib_main_t * vm)
856 if (vec_len (vlib_mains) < 2)
860 * Shut off (especially) worker-thread session nodes.
861 * Otherwise, vpp can crash as the main thread unmaps the
864 vlib_worker_thread_barrier_sync (vm);
865 session_node_enable_disable (0 /* is_enable */ );
866 vlib_worker_thread_barrier_release (vm);
870 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
873 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
876 f64 now, timeout = 1.0;
877 uword *event_data = 0;
882 vlib_process_wait_for_event_or_clock (vm, timeout);
883 now = vlib_time_now (vm);
884 event_type = vlib_process_get_events (vm, (uword **) & event_data);
888 case SESSION_Q_PROCESS_FLUSH_FRAMES:
889 /* Flush the frames by updating all transports times */
890 transport_update_time (now, 0);
892 case SESSION_Q_PROCESS_STOP:
896 /* Timed out. Update time for all transports to trigger all
897 * outstanding retransmits. */
898 transport_update_time (now, 0);
901 vec_reset_length (event_data);
907 VLIB_REGISTER_NODE (session_queue_process_node) =
909 .function = session_queue_process,
910 .type = VLIB_NODE_TYPE_PROCESS,
911 .name = "session-queue-process",
912 .state = VLIB_NODE_STATE_DISABLED,
918 * fd.io coding-style-patch-verification: ON
921 * eval: (c-set-style "gnu")