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)
263 if (s->session_state == SESSION_STATE_CLOSED)
269 always_inline transport_connection_t *
270 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
274 return ctx->transport_vft->get_connection (ctx->s->connection_index,
275 ctx->s->thread_index);
279 if (ctx->s->session_state == SESSION_STATE_LISTENING)
280 return ctx->transport_vft->get_listener (ctx->s->connection_index);
283 return ctx->transport_vft->get_connection (ctx->s->connection_index,
284 ctx->s->thread_index);
290 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
291 u32 max_segs, u8 peek_data)
293 u32 n_bytes_per_buf, n_bytes_per_seg;
294 ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo);
297 /* Offset in rx fifo from where to peek data */
298 ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
299 if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
301 ctx->max_len_to_snd = 0;
304 ctx->max_dequeue -= ctx->tx_offset;
308 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
310 if (ctx->max_dequeue <= sizeof (ctx->hdr))
312 ctx->max_len_to_snd = 0;
315 svm_fifo_peek (ctx->s->server_tx_fifo, 0, sizeof (ctx->hdr),
317 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
318 ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
321 ASSERT (ctx->max_dequeue > 0);
323 /* Ensure we're not writing more than transport window allows */
324 if (ctx->max_dequeue < ctx->snd_space)
326 /* Constrained by tx queue. Try to send only fully formed segments */
327 ctx->max_len_to_snd =
328 (ctx->max_dequeue > ctx->snd_mss) ?
329 ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
334 /* Expectation is that snd_space0 is already a multiple of snd_mss */
335 ctx->max_len_to_snd = ctx->snd_space;
338 /* Check if we're tx constrained by the node */
339 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
340 if (ctx->n_segs_per_evt > max_segs)
342 ctx->n_segs_per_evt = max_segs;
343 ctx->max_len_to_snd = max_segs * ctx->snd_mss;
346 n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm,
347 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
348 ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
349 n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss;
350 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
351 ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
352 ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
353 n_bytes_per_buf - MAX_HDRS_LEN);
357 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
358 session_fifo_event_t * e,
359 stream_session_t * s, int *n_tx_packets,
362 u32 next_index, next0, next1, next2, next3, *to_next, n_left_to_next;
363 u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
364 u32 thread_index = s->thread_index, n_left, pbi;
365 session_manager_main_t *smm = &session_manager_main;
366 session_tx_context_t *ctx = &smm->ctx[thread_index];
367 transport_proto_t tp;
371 if (PREDICT_FALSE ((rv = session_tx_not_ready (s, peek_data))))
374 vec_add1 (smm->pending_event_vector[thread_index], *e);
378 next_index = smm->session_type_to_next[s->session_type];
379 next0 = next1 = next2 = next3 = next_index;
381 tp = session_get_transport_proto (s);
383 ctx->transport_vft = transport_protocol_get_vft (tp);
384 ctx->tc = session_tx_get_transport (ctx, peek_data);
385 ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
386 ctx->snd_space = ctx->transport_vft->send_space (ctx->tc);
387 if (ctx->snd_space == 0 || ctx->snd_mss == 0)
389 vec_add1 (smm->pending_event_vector[thread_index], *e);
393 /* Allow enqueuing of a new event */
394 svm_fifo_unset_event (s->server_tx_fifo);
396 /* Check how much we can pull. */
397 session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
400 if (PREDICT_FALSE (!ctx->max_len_to_snd))
403 n_bufs = vec_len (smm->tx_buffers[thread_index]);
404 n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
407 * Make sure we have at least one full frame of buffers ready
409 if (n_bufs < n_bufs_needed)
411 session_output_try_get_buffers (vm, smm, thread_index, &n_bufs,
412 ctx->n_bufs_per_seg * VLIB_FRAME_SIZE);
413 if (PREDICT_FALSE (n_bufs < n_bufs_needed))
415 vec_add1 (smm->pending_event_vector[thread_index], *e);
421 * Write until we fill up a frame
423 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
424 if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
426 ctx->n_segs_per_evt = n_left_to_next;
427 ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
429 ctx->left_to_snd = ctx->max_len_to_snd;
430 n_left = ctx->n_segs_per_evt;
435 vlib_buffer_t *b0, *b1;
438 pbi = smm->tx_buffers[thread_index][n_bufs - 3];
439 pb = vlib_get_buffer (vm, pbi);
440 vlib_prefetch_buffer_header (pb, STORE);
441 pbi = smm->tx_buffers[thread_index][n_bufs - 4];
442 pb = vlib_get_buffer (vm, pbi);
443 vlib_prefetch_buffer_header (pb, STORE);
445 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
446 to_next[1] = bi1 = smm->tx_buffers[thread_index][--n_bufs];
448 b0 = vlib_get_buffer (vm, bi0);
449 b1 = vlib_get_buffer (vm, bi1);
451 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
452 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
454 ctx->transport_vft->push_header (ctx->tc, b0);
455 ctx->transport_vft->push_header (ctx->tc, b1);
461 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
462 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
464 if (PREDICT_FALSE (n_trace > 0))
466 session_tx_trace_buffer (vm, node, next_index, b0, s, &n_trace);
468 session_tx_trace_buffer (vm, node, next_index, b1, s,
472 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
473 n_left_to_next, bi0, bi1,
481 ASSERT (n_bufs >= 1);
482 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
483 b0 = vlib_get_buffer (vm, bi0);
484 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
486 /* Ask transport to push header after current_length and
487 * total_length_not_including_first_buffer are updated */
488 ctx->transport_vft->push_header (ctx->tc, b0);
494 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
495 if (PREDICT_FALSE (n_trace > 0))
496 session_tx_trace_buffer (vm, node, next_index, b0, s, &n_trace);
498 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
499 n_left_to_next, bi0, next0);
502 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
503 *n_tx_packets += ctx->n_segs_per_evt;
504 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
506 /* If we couldn't dequeue all bytes mark as partially read */
507 ASSERT (ctx->left_to_snd == 0);
508 if (ctx->max_len_to_snd < ctx->max_dequeue)
509 if (svm_fifo_set_event (s->server_tx_fifo))
510 vec_add1 (smm->pending_event_vector[thread_index], *e);
512 if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
514 /* Fix dgram pre header */
515 if (ctx->max_len_to_snd < ctx->max_dequeue)
516 svm_fifo_overwrite_head (s->server_tx_fifo, (u8 *) & ctx->hdr,
517 sizeof (session_dgram_pre_hdr_t));
518 /* More data needs to be read */
519 else if (svm_fifo_max_dequeue (s->server_tx_fifo) > 0)
520 if (svm_fifo_set_event (s->server_tx_fifo))
521 vec_add1 (smm->pending_event_vector[thread_index], *e);
527 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
528 session_fifo_event_t * e0,
529 stream_session_t * s0, int *n_tx_pkts)
531 return session_tx_fifo_read_and_snd_i (vm, node, e0, s0, n_tx_pkts, 1);
535 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
536 session_fifo_event_t * e0,
537 stream_session_t * s0, int *n_tx_pkts)
539 return session_tx_fifo_read_and_snd_i (vm, node, e0, s0, n_tx_pkts, 0);
543 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
544 vlib_node_runtime_t * node,
545 session_fifo_event_t * e0,
546 stream_session_t * s0, int *n_tx_pkts)
549 app = application_get (s0->opaque);
550 svm_fifo_unset_event (s0->server_tx_fifo);
551 return app->cb_fns.builtin_app_tx_callback (s0);
554 always_inline stream_session_t *
555 session_event_get_session (session_fifo_event_t * e, u8 thread_index)
557 return session_get_if_valid (e->fifo->master_session_index, thread_index);
561 dump_thread_0_event_queue (void)
563 session_manager_main_t *smm = vnet_get_session_manager_main ();
564 vlib_main_t *vm = &vlib_global_main;
565 u32 my_thread_index = vm->thread_index;
566 session_fifo_event_t _e, *e = &_e;
567 stream_session_t *s0;
572 q = smm->vpp_event_queues[my_thread_index];
576 for (i = 0; i < q->cursize; i++)
578 headp = (i8 *) (&q->data[0] + q->elsize * index);
579 clib_memcpy (e, headp, q->elsize);
581 switch (e->event_type)
583 case FIFO_EVENT_APP_TX:
584 s0 = session_event_get_session (e, my_thread_index);
585 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
588 case FIFO_EVENT_DISCONNECT:
589 s0 = session_get_from_handle (e->session_handle);
590 fformat (stdout, "[%04d] disconnect session %d\n", i,
594 case FIFO_EVENT_BUILTIN_RX:
595 s0 = session_event_get_session (e, my_thread_index);
596 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
600 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
601 i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg));
605 fformat (stdout, "[%04d] unhandled event type %d\n",
612 if (index == q->maxsize)
618 session_node_cmp_event (session_fifo_event_t * e, svm_fifo_t * f)
621 switch (e->event_type)
623 case FIFO_EVENT_APP_RX:
624 case FIFO_EVENT_APP_TX:
625 case FIFO_EVENT_BUILTIN_RX:
629 case FIFO_EVENT_DISCONNECT:
632 s = session_get_from_handle (e->session_handle);
635 clib_warning ("session has event but doesn't exist!");
638 if (s->server_rx_fifo == f || s->server_tx_fifo == f)
648 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e)
650 session_manager_main_t *smm = vnet_get_session_manager_main ();
652 session_fifo_event_t *pending_event_vector, *evt;
653 int i, index, found = 0;
658 thread_index = f->master_thread_index;
662 q = smm->vpp_event_queues[thread_index];
664 for (i = 0; i < q->cursize; i++)
666 headp = (i8 *) (&q->data[0] + q->elsize * index);
667 clib_memcpy (e, headp, q->elsize);
668 found = session_node_cmp_event (e, f);
671 if (++index == q->maxsize)
675 * Search pending events vector
677 pending_event_vector = smm->pending_event_vector[thread_index];
678 vec_foreach (evt, pending_event_vector)
680 found = session_node_cmp_event (evt, f);
683 clib_memcpy (e, evt, sizeof (*evt));
691 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
692 vlib_frame_t * frame)
694 session_manager_main_t *smm = vnet_get_session_manager_main ();
695 session_fifo_event_t *my_pending_event_vector, *e;
696 session_fifo_event_t *my_fifo_events;
697 u32 n_to_dequeue, n_events;
700 int n_tx_packets = 0;
701 u32 thread_index = vm->thread_index;
703 f64 now = vlib_time_now (vm);
706 SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
709 * Update transport time
711 transport_update_time (now, thread_index);
714 * Get vpp queue events
716 q = smm->vpp_event_queues[thread_index];
717 if (PREDICT_FALSE (q == 0))
720 my_fifo_events = smm->free_event_vector[thread_index];
722 /* min number of events we can dequeue without blocking */
723 n_to_dequeue = q->cursize;
724 my_pending_event_vector = smm->pending_event_vector[thread_index];
726 if (!n_to_dequeue && !vec_len (my_pending_event_vector)
727 && !vec_len (smm->pending_disconnects[thread_index]))
730 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
733 * If we didn't manage to process previous events try going
734 * over them again without dequeuing new ones.
736 /* XXX: Block senders to sessions that can't keep up */
737 if (0 && vec_len (my_pending_event_vector) >= 100)
739 clib_warning ("too many fifo events unsolved");
743 /* See you in the next life, don't be late */
744 if (pthread_mutex_trylock (&q->mutex))
747 for (i = 0; i < n_to_dequeue; i++)
749 vec_add2 (my_fifo_events, e, 1);
750 svm_queue_sub_raw (q, (u8 *) e);
753 /* The other side of the connection is not polling */
754 if (q->cursize < (q->maxsize / 8))
755 (void) pthread_cond_broadcast (&q->condvar);
756 pthread_mutex_unlock (&q->mutex);
758 vec_append (my_fifo_events, my_pending_event_vector);
759 vec_append (my_fifo_events, smm->pending_disconnects[thread_index]);
761 _vec_len (my_pending_event_vector) = 0;
762 smm->pending_event_vector[thread_index] = my_pending_event_vector;
763 _vec_len (smm->pending_disconnects[thread_index]) = 0;
766 n_events = vec_len (my_fifo_events);
767 for (i = 0; i < n_events; i++)
769 stream_session_t *s0; /* $$$ prefetch 1 ahead maybe */
770 session_fifo_event_t *e0;
772 e0 = &my_fifo_events[i];
773 switch (e0->event_type)
775 case FIFO_EVENT_APP_TX:
776 if (n_tx_packets == VLIB_FRAME_SIZE)
778 vec_add1 (smm->pending_event_vector[thread_index], *e0);
782 s0 = session_event_get_session (e0, thread_index);
783 if (PREDICT_FALSE (!s0))
785 clib_warning ("It's dead, Jim!");
789 /* Spray packets in per session type frames, since they go to
791 rv = (smm->session_tx_fns[s0->session_type]) (vm, node, e0, s0,
794 if (PREDICT_FALSE (rv < 0))
796 vlib_node_increment_counter (vm, node->node_index,
797 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
801 case FIFO_EVENT_DISCONNECT:
802 /* Make sure stream disconnects run after the pending list is drained */
803 s0 = session_get_from_handle (e0->session_handle);
807 vec_add1 (smm->pending_disconnects[thread_index], *e0);
810 /* If tx queue is still not empty, wait a bit */
811 if (svm_fifo_max_dequeue (s0->server_tx_fifo)
812 && e0->postponed < 200)
815 vec_add1 (smm->pending_disconnects[thread_index], *e0);
819 stream_session_disconnect_transport (s0);
821 case FIFO_EVENT_BUILTIN_RX:
822 s0 = session_event_get_session (e0, thread_index);
823 if (PREDICT_FALSE (!s0))
825 svm_fifo_unset_event (s0->server_rx_fifo);
826 app = application_get (s0->app_index);
827 app->cb_fns.builtin_app_rx_callback (s0);
830 fp = e0->rpc_args.fp;
831 (*fp) (e0->rpc_args.arg);
835 clib_warning ("unhandled event type %d", e0->event_type);
839 _vec_len (my_fifo_events) = 0;
840 smm->free_event_vector[thread_index] = my_fifo_events;
842 vlib_node_increment_counter (vm, session_queue_node.index,
843 SESSION_QUEUE_ERROR_TX, n_tx_packets);
845 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 1);
851 VLIB_REGISTER_NODE (session_queue_node) =
853 .function = session_queue_node_fn,
854 .name = "session-queue",
855 .format_trace = format_session_queue_trace,
856 .type = VLIB_NODE_TYPE_INPUT,
857 .n_errors = ARRAY_LEN (session_queue_error_strings),
858 .error_strings = session_queue_error_strings,
859 .state = VLIB_NODE_STATE_DISABLED,
863 static clib_error_t *
864 session_queue_exit (vlib_main_t * vm)
866 if (vec_len (vlib_mains) < 2)
870 * Shut off (especially) worker-thread session nodes.
871 * Otherwise, vpp can crash as the main thread unmaps the
874 vlib_worker_thread_barrier_sync (vm);
875 session_node_enable_disable (0 /* is_enable */ );
876 vlib_worker_thread_barrier_release (vm);
880 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
883 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
886 f64 now, timeout = 1.0;
887 uword *event_data = 0;
892 vlib_process_wait_for_event_or_clock (vm, timeout);
893 now = vlib_time_now (vm);
894 event_type = vlib_process_get_events (vm, (uword **) & event_data);
898 case SESSION_Q_PROCESS_FLUSH_FRAMES:
899 /* Flush the frames by updating all transports times */
900 transport_update_time (now, 0);
902 case SESSION_Q_PROCESS_STOP:
906 /* Timed out. Update time for all transports to trigger all
907 * outstanding retransmits. */
908 transport_update_time (now, 0);
911 vec_reset_length (event_data);
917 VLIB_REGISTER_NODE (session_queue_process_node) =
919 .function = session_queue_process,
920 .type = VLIB_NODE_TYPE_PROCESS,
921 .name = "session-queue-process",
922 .state = VLIB_NODE_STATE_DISABLED,
928 * fd.io coding-style-patch-verification: ON
931 * eval: (c-set-style "gnu")