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 app_worker_t *app_wrk;
48 ls = application_get_local_session_from_handle (mp->handle);
51 clib_warning ("unknown local handle 0x%lx", mp->handle);
54 app_wrk = app_worker_get (ls->app_wrk_index);
55 app = application_get (app_wrk->app_index);
56 if (app->app_index != mp->context)
58 clib_warning ("server %u doesn't own local handle 0x%lx",
59 mp->context, mp->handle);
62 if (application_local_session_connect_notify (ls))
64 ls->session_state = SESSION_STATE_READY;
68 s = session_get_from_handle_if_valid (mp->handle);
71 clib_warning ("session doesn't exist");
74 if (s->app_wrk_index != mp->context)
76 clib_warning ("app doesn't own session");
79 s->session_state = SESSION_STATE_READY;
80 if (!svm_fifo_is_empty (s->server_rx_fifo))
83 app = app_worker_get (s->app_wrk_index);
84 app_worker_send_event (app, s, FIFO_EVENT_APP_RX);
90 session_mq_reset_reply_handler (void *data)
92 session_reset_reply_msg_t *mp;
93 app_worker_t *app_wrk;
96 u32 index, thread_index;
98 mp = (session_reset_reply_msg_t *) data;
99 app = application_lookup (mp->client_index);
103 session_parse_handle (mp->handle, &index, &thread_index);
104 s = session_get_if_valid (index, thread_index);
107 clib_warning ("Invalid session!");
110 app_wrk = app_worker_get (s->app_wrk_index);
111 if (!app_wrk || app_wrk->app_index != app->app_index)
113 clib_warning ("App % does not own handle 0x%lx!", app->app_index,
118 /* Client objected to resetting the session, log and continue */
121 clib_warning ("client retval %d", mp->retval);
125 /* This comes as a response to a reset, transport only waiting for
126 * confirmation to remove connection state, no need to disconnect */
127 stream_session_cleanup (s);
131 session_mq_disconnected_handler (void *data)
133 session_disconnected_reply_msg_t *rmp;
134 vnet_disconnect_args_t _a, *a = &_a;
135 svm_msg_q_msg_t _msg, *msg = &_msg;
136 session_disconnected_msg_t *mp;
137 app_worker_t *app_wrk;
138 session_event_t *evt;
143 mp = (session_disconnected_msg_t *) data;
144 if (!(s = session_get_from_handle_if_valid (mp->handle)))
146 clib_warning ("could not disconnect handle %llu", mp->handle);
149 app_wrk = app_worker_get (s->app_wrk_index);
150 app = application_lookup (mp->client_index);
151 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
153 clib_warning ("could not disconnect session: %llu app: %u",
154 mp->handle, mp->client_index);
158 a->handle = mp->handle;
159 a->app_index = app_wrk->wrk_index;
160 rv = vnet_disconnect_session (a);
162 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
163 SESSION_MQ_CTRL_EVT_RING,
165 svm_msg_q_unlock (app_wrk->event_queue);
166 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
167 memset (evt, 0, sizeof (*evt));
168 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED;
169 rmp = (session_disconnected_reply_msg_t *) evt->data;
170 rmp->handle = mp->handle;
171 rmp->context = mp->context;
173 svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT);
177 session_mq_disconnected_reply_handler (void *data)
179 session_disconnected_reply_msg_t *mp;
180 vnet_disconnect_args_t _a, *a = &_a;
183 mp = (session_disconnected_reply_msg_t *) data;
185 /* Client objected to disconnecting the session, log and continue */
188 clib_warning ("client retval %d", mp->retval);
192 /* Disconnect has been confirmed. Confirm close to transport */
193 app = application_lookup (mp->context);
196 a->handle = mp->handle;
197 a->app_index = app->app_index;
198 vnet_disconnect_session (a);
202 vlib_node_registration_t session_queue_node;
207 u32 server_thread_index;
208 } session_queue_trace_t;
210 /* packet trace format function */
212 format_session_queue_trace (u8 * s, va_list * args)
214 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
215 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
216 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
218 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
219 t->session_index, t->server_thread_index);
223 #define foreach_session_queue_error \
224 _(TX, "Packets transmitted") \
225 _(TIMER, "Timer events") \
226 _(NO_BUFFER, "Out of buffers")
230 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
231 foreach_session_queue_error
233 SESSION_QUEUE_N_ERROR,
234 } session_queue_error_t;
236 static char *session_queue_error_strings[] = {
237 #define _(sym,string) string,
238 foreach_session_queue_error
244 SESSION_TX_NO_BUFFERS = -2,
250 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
251 u32 next_index, u32 * to_next, u16 n_segs,
252 stream_session_t * s, u32 n_trace)
254 session_queue_trace_t *t;
258 for (i = 0; i < clib_min (n_trace, n_segs); i++)
260 b = vlib_get_buffer (vm, to_next[i - n_segs]);
261 vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
262 t = vlib_add_trace (vm, node, b, sizeof (*t));
263 t->session_index = s->session_index;
264 t->server_thread_index = s->thread_index;
266 vlib_set_trace_count (vm, node, n_trace - i);
270 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
271 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
273 session_manager_main_t *smm = &session_manager_main;
274 vlib_buffer_t *chain_b, *prev_b;
275 u32 chain_bi0, to_deq, left_from_seg;
276 u16 len_to_deq, n_bytes_read;
279 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
280 b->total_length_not_including_first_buffer = 0;
283 left_from_seg = clib_min (ctx->snd_mss - b->current_length,
285 to_deq = left_from_seg;
286 for (j = 1; j < ctx->n_bufs_per_seg; j++)
289 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
292 chain_bi0 = smm->tx_buffers[ctx->s->thread_index][*n_bufs];
293 _vec_len (smm->tx_buffers[ctx->s->thread_index]) = *n_bufs;
295 chain_b = vlib_get_buffer (vm, chain_bi0);
296 chain_b->current_data = 0;
297 data = vlib_buffer_get_current (chain_b);
300 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo,
301 ctx->tx_offset, len_to_deq, data);
302 ctx->tx_offset += n_bytes_read;
306 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
308 svm_fifo_t *f = ctx->s->server_tx_fifo;
309 session_dgram_hdr_t *hdr = &ctx->hdr;
311 deq_now = clib_min (hdr->data_length - hdr->data_offset,
313 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
315 ASSERT (n_bytes_read > 0);
317 hdr->data_offset += n_bytes_read;
318 if (hdr->data_offset == hdr->data_length)
320 u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
321 svm_fifo_dequeue_drop (f, offset);
325 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
328 ASSERT (n_bytes_read == len_to_deq);
329 chain_b->current_length = n_bytes_read;
330 b->total_length_not_including_first_buffer += chain_b->current_length;
332 /* update previous buffer */
333 prev_b->next_buffer = chain_bi0;
334 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
336 /* update current buffer */
337 chain_b->next_buffer = 0;
339 to_deq -= n_bytes_read;
344 && b->total_length_not_including_first_buffer == left_from_seg);
345 ctx->left_to_snd -= left_from_seg;
349 session_output_try_get_buffers (vlib_main_t * vm,
350 session_manager_main_t * smm,
351 u32 thread_index, u16 * n_bufs, u32 wanted)
354 vec_validate_aligned (smm->tx_buffers[thread_index], wanted - 1,
355 CLIB_CACHE_LINE_BYTES);
356 n_alloc = vlib_buffer_alloc (vm, &smm->tx_buffers[thread_index][*n_bufs],
359 _vec_len (smm->tx_buffers[thread_index]) = *n_bufs;
364 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
365 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
372 * Start with the first buffer in chain
375 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
378 data0 = vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
379 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
383 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo, ctx->tx_offset,
385 ASSERT (n_bytes_read > 0);
386 /* Keep track of progress locally, transport is also supposed to
387 * increment it independently when pushing the header */
388 ctx->tx_offset += n_bytes_read;
392 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
394 session_dgram_hdr_t *hdr = &ctx->hdr;
395 svm_fifo_t *f = ctx->s->server_tx_fifo;
399 ASSERT (hdr->data_length > hdr->data_offset);
400 deq_now = clib_min (hdr->data_length - hdr->data_offset,
402 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
403 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
404 ASSERT (n_bytes_read > 0);
406 if (ctx->s->session_state == SESSION_STATE_LISTENING)
408 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
409 ctx->tc->rmt_port = hdr->rmt_port;
411 hdr->data_offset += n_bytes_read;
412 if (hdr->data_offset == hdr->data_length)
414 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
415 svm_fifo_dequeue_drop (f, offset);
420 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
422 ASSERT (n_bytes_read > 0);
425 b->current_length = n_bytes_read;
426 ctx->left_to_snd -= n_bytes_read;
429 * Fill in the remaining buffers in the chain, if any
431 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
432 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
435 SESSION_EVT_DBG(SESSION_EVT_DEQ, ctx->s, ({
436 ed->data[0] = FIFO_EVENT_APP_TX;
437 ed->data[1] = ctx->max_dequeue;
438 ed->data[2] = len_to_deq;
439 ed->data[3] = ctx->left_to_snd;
445 session_tx_not_ready (stream_session_t * s, u8 peek_data)
449 /* Can retransmit for closed sessions but can't send new data if
450 * session is not ready or closed */
451 if (s->session_state < SESSION_STATE_READY)
453 if (s->session_state == SESSION_STATE_CLOSED)
459 always_inline transport_connection_t *
460 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
464 return ctx->transport_vft->get_connection (ctx->s->connection_index,
465 ctx->s->thread_index);
469 if (ctx->s->session_state == SESSION_STATE_LISTENING)
470 return ctx->transport_vft->get_listener (ctx->s->connection_index);
473 return ctx->transport_vft->get_connection (ctx->s->connection_index,
474 ctx->s->thread_index);
480 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
481 u32 max_segs, u8 peek_data)
483 u32 n_bytes_per_buf, n_bytes_per_seg;
484 ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo);
487 /* Offset in rx fifo from where to peek data */
488 ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
489 if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
491 ctx->max_len_to_snd = 0;
494 ctx->max_dequeue -= ctx->tx_offset;
498 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
500 if (ctx->max_dequeue <= sizeof (ctx->hdr))
502 ctx->max_len_to_snd = 0;
505 svm_fifo_peek (ctx->s->server_tx_fifo, 0, sizeof (ctx->hdr),
507 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
508 ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
511 ASSERT (ctx->max_dequeue > 0);
513 /* Ensure we're not writing more than transport window allows */
514 if (ctx->max_dequeue < ctx->snd_space)
516 /* Constrained by tx queue. Try to send only fully formed segments */
517 ctx->max_len_to_snd =
518 (ctx->max_dequeue > ctx->snd_mss) ?
519 ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
524 /* Expectation is that snd_space0 is already a multiple of snd_mss */
525 ctx->max_len_to_snd = ctx->snd_space;
528 /* Check if we're tx constrained by the node */
529 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
530 if (ctx->n_segs_per_evt > max_segs)
532 ctx->n_segs_per_evt = max_segs;
533 ctx->max_len_to_snd = max_segs * ctx->snd_mss;
536 n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm,
537 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
538 ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
539 n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss;
540 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
541 ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
542 ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
543 n_bytes_per_buf - MAX_HDRS_LEN);
547 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
549 stream_session_t * s, int *n_tx_packets,
552 u32 next_index, next0, next1, *to_next, n_left_to_next;
553 u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
554 u32 thread_index = s->thread_index, n_left, pbi;
555 session_manager_main_t *smm = &session_manager_main;
556 session_tx_context_t *ctx = &smm->ctx[thread_index];
557 transport_proto_t tp;
561 if (PREDICT_FALSE ((rv = session_tx_not_ready (s, peek_data))))
564 vec_add1 (smm->pending_event_vector[thread_index], *e);
565 return SESSION_TX_NO_DATA;
568 next_index = smm->session_type_to_next[s->session_type];
569 next0 = next1 = next_index;
571 tp = session_get_transport_proto (s);
573 ctx->transport_vft = transport_protocol_get_vft (tp);
574 ctx->tc = session_tx_get_transport (ctx, peek_data);
575 ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
576 ctx->snd_space = ctx->transport_vft->send_space (ctx->tc);
577 if (ctx->snd_space == 0 || ctx->snd_mss == 0)
579 vec_add1 (smm->pending_event_vector[thread_index], *e);
580 return SESSION_TX_NO_DATA;
583 /* Allow enqueuing of a new event */
584 svm_fifo_unset_event (s->server_tx_fifo);
586 /* Check how much we can pull. */
587 session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
590 if (PREDICT_FALSE (!ctx->max_len_to_snd))
591 return SESSION_TX_NO_DATA;
593 n_bufs = vec_len (smm->tx_buffers[thread_index]);
594 n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
597 * Make sure we have at least one full frame of buffers ready
599 if (n_bufs < n_bufs_needed)
601 session_output_try_get_buffers (vm, smm, thread_index, &n_bufs,
602 ctx->n_bufs_per_seg * VLIB_FRAME_SIZE);
603 if (PREDICT_FALSE (n_bufs < n_bufs_needed))
605 vec_add1 (smm->pending_event_vector[thread_index], *e);
606 return SESSION_TX_NO_BUFFERS;
611 * Write until we fill up a frame
613 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
614 if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
616 ctx->n_segs_per_evt = n_left_to_next;
617 ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
619 ctx->left_to_snd = ctx->max_len_to_snd;
620 n_left = ctx->n_segs_per_evt;
624 vlib_buffer_t *b0, *b1;
627 pbi = smm->tx_buffers[thread_index][n_bufs - 3];
628 pb = vlib_get_buffer (vm, pbi);
629 vlib_prefetch_buffer_header (pb, STORE);
630 pbi = smm->tx_buffers[thread_index][n_bufs - 4];
631 pb = vlib_get_buffer (vm, pbi);
632 vlib_prefetch_buffer_header (pb, STORE);
634 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
635 to_next[1] = bi1 = smm->tx_buffers[thread_index][--n_bufs];
637 b0 = vlib_get_buffer (vm, bi0);
638 b1 = vlib_get_buffer (vm, bi1);
640 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
641 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
643 ctx->transport_vft->push_header (ctx->tc, b0);
644 ctx->transport_vft->push_header (ctx->tc, b1);
650 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
651 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
653 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
654 n_left_to_next, bi0, bi1, next0,
664 pbi = smm->tx_buffers[thread_index][n_bufs - 2];
665 pb = vlib_get_buffer (vm, pbi);
666 vlib_prefetch_buffer_header (pb, STORE);
669 to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs];
670 b0 = vlib_get_buffer (vm, bi0);
671 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
673 /* Ask transport to push header after current_length and
674 * total_length_not_including_first_buffer are updated */
675 ctx->transport_vft->push_header (ctx->tc, b0);
681 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
683 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
684 n_left_to_next, bi0, next0);
687 if (PREDICT_FALSE (n_trace > 0))
688 session_tx_trace_frame (vm, node, next_index, to_next,
689 ctx->n_segs_per_evt, s, n_trace);
691 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
692 *n_tx_packets += ctx->n_segs_per_evt;
693 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
695 /* If we couldn't dequeue all bytes mark as partially read */
696 ASSERT (ctx->left_to_snd == 0);
697 if (ctx->max_len_to_snd < ctx->max_dequeue)
698 if (svm_fifo_set_event (s->server_tx_fifo))
699 vec_add1 (smm->pending_event_vector[thread_index], *e);
701 if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
703 /* Fix dgram pre header */
704 if (ctx->max_len_to_snd < ctx->max_dequeue)
705 svm_fifo_overwrite_head (s->server_tx_fifo, (u8 *) & ctx->hdr,
706 sizeof (session_dgram_pre_hdr_t));
707 /* More data needs to be read */
708 else if (svm_fifo_max_dequeue (s->server_tx_fifo) > 0)
709 if (svm_fifo_set_event (s->server_tx_fifo))
710 vec_add1 (smm->pending_event_vector[thread_index], *e);
712 return SESSION_TX_OK;
716 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
718 stream_session_t * s, int *n_tx_pkts)
720 return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 1);
724 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
726 stream_session_t * s, int *n_tx_pkts)
728 return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 0);
732 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
733 vlib_node_runtime_t * node,
735 stream_session_t * s, int *n_tx_pkts)
738 app = application_get (s->t_app_index);
739 svm_fifo_unset_event (s->server_tx_fifo);
740 return app->cb_fns.builtin_app_tx_callback (s);
743 always_inline stream_session_t *
744 session_event_get_session (session_event_t * e, u8 thread_index)
746 return session_get_if_valid (e->fifo->master_session_index, thread_index);
750 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
751 vlib_frame_t * frame)
753 session_manager_main_t *smm = vnet_get_session_manager_main ();
754 u32 thread_index = vm->thread_index, n_to_dequeue, n_events;
755 session_event_t *pending_events, *e;
756 session_event_t *fifo_events;
757 svm_msg_q_msg_t _msg, *msg = &_msg;
758 f64 now = vlib_time_now (vm);
759 int n_tx_packets = 0, i, rv;
760 app_worker_t *app_wrk;
765 SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
768 * Update transport time
770 transport_update_time (now, thread_index);
773 * Get vpp queue events that we can dequeue without blocking
775 mq = smm->vpp_event_queues[thread_index];
776 fifo_events = smm->free_event_vector[thread_index];
777 n_to_dequeue = svm_msg_q_size (mq);
778 pending_events = smm->pending_event_vector[thread_index];
780 if (!n_to_dequeue && !vec_len (pending_events)
781 && !vec_len (smm->pending_disconnects[thread_index]))
784 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
787 * If we didn't manage to process previous events try going
788 * over them again without dequeuing new ones.
789 * XXX: Handle senders to sessions that can't keep up
791 if (0 && vec_len (pending_events) >= 100)
793 clib_warning ("too many fifo events unsolved");
797 /* See you in the next life, don't be late
798 * XXX: we may need priorities here */
799 if (svm_msg_q_try_lock (mq))
802 for (i = 0; i < n_to_dequeue; i++)
804 vec_add2 (fifo_events, e, 1);
805 svm_msg_q_sub_w_lock (mq, msg);
806 clib_memcpy (e, svm_msg_q_msg_data (mq, msg), sizeof (*e));
807 svm_msg_q_free_msg (mq, msg);
810 svm_msg_q_unlock (mq);
812 vec_append (fifo_events, pending_events);
813 vec_append (fifo_events, smm->pending_disconnects[thread_index]);
815 _vec_len (pending_events) = 0;
816 smm->pending_event_vector[thread_index] = pending_events;
817 _vec_len (smm->pending_disconnects[thread_index]) = 0;
820 n_events = vec_len (fifo_events);
821 for (i = 0; i < n_events; i++)
823 stream_session_t *s; /* $$$ prefetch 1 ahead maybe */
828 switch (e->event_type)
830 case FIFO_EVENT_APP_TX:
831 /* Don't try to send more that one frame per dispatch cycle */
832 if (n_tx_packets == VLIB_FRAME_SIZE)
834 vec_add1 (smm->pending_event_vector[thread_index], *e);
838 s = session_event_get_session (e, thread_index);
839 if (PREDICT_FALSE (!s))
841 clib_warning ("It's dead, Jim!");
844 is_full = svm_fifo_is_full (s->server_tx_fifo);
846 /* Spray packets in per session type frames, since they go to
848 rv = (smm->session_tx_fns[s->session_type]) (vm, node, e, s,
850 if (PREDICT_TRUE (rv == SESSION_TX_OK))
852 /* Notify app there's tx space if not polling */
853 if (PREDICT_FALSE (is_full
854 && !svm_fifo_has_event (s->server_tx_fifo)))
855 session_dequeue_notify (s);
857 else if (PREDICT_FALSE (rv == SESSION_TX_NO_BUFFERS))
859 vlib_node_increment_counter (vm, node->node_index,
860 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
864 case FIFO_EVENT_DISCONNECT:
865 /* Make sure stream disconnects run after the pending list is
867 s = session_get_from_handle (e->session_handle);
871 vec_add1 (smm->pending_disconnects[thread_index], *e);
874 /* If tx queue is still not empty, wait */
875 if (svm_fifo_max_dequeue (s->server_tx_fifo))
877 vec_add1 (smm->pending_disconnects[thread_index], *e);
881 stream_session_disconnect_transport (s);
883 case FIFO_EVENT_BUILTIN_RX:
884 s = session_event_get_session (e, thread_index);
885 if (PREDICT_FALSE (!s))
887 svm_fifo_unset_event (s->server_rx_fifo);
888 app_wrk = app_worker_get (s->app_wrk_index);
889 app = application_get (app_wrk->app_index);
890 app->cb_fns.builtin_app_rx_callback (s);
894 (*fp) (e->rpc_args.arg);
896 case SESSION_CTRL_EVT_DISCONNECTED:
897 session_mq_disconnected_handler (e->data);
899 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
900 session_mq_accepted_reply_handler (e->data);
902 case SESSION_CTRL_EVT_CONNECTED_REPLY:
904 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
905 session_mq_disconnected_reply_handler (e->data);
907 case SESSION_CTRL_EVT_RESET_REPLY:
908 session_mq_reset_reply_handler (e->data);
911 clib_warning ("unhandled event type %d", e->event_type);
915 _vec_len (fifo_events) = 0;
916 smm->free_event_vector[thread_index] = fifo_events;
918 vlib_node_increment_counter (vm, session_queue_node.index,
919 SESSION_QUEUE_ERROR_TX, n_tx_packets);
921 SESSION_EVT_DBG (SESSION_EVT_DISPATCH_END, smm, thread_index);
927 VLIB_REGISTER_NODE (session_queue_node) =
929 .function = session_queue_node_fn,
930 .name = "session-queue",
931 .format_trace = format_session_queue_trace,
932 .type = VLIB_NODE_TYPE_INPUT,
933 .n_errors = ARRAY_LEN (session_queue_error_strings),
934 .error_strings = session_queue_error_strings,
935 .state = VLIB_NODE_STATE_DISABLED,
940 dump_thread_0_event_queue (void)
942 session_manager_main_t *smm = vnet_get_session_manager_main ();
943 vlib_main_t *vm = &vlib_global_main;
944 u32 my_thread_index = vm->thread_index;
945 session_event_t _e, *e = &_e;
946 svm_msg_q_ring_t *ring;
947 stream_session_t *s0;
948 svm_msg_q_msg_t *msg;
952 mq = smm->vpp_event_queues[my_thread_index];
955 for (i = 0; i < mq->q->cursize; i++)
957 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
958 ring = svm_msg_q_ring (mq, msg->ring_index);
959 clib_memcpy (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
961 switch (e->event_type)
963 case FIFO_EVENT_APP_TX:
964 s0 = session_event_get_session (e, my_thread_index);
965 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
968 case FIFO_EVENT_DISCONNECT:
969 s0 = session_get_from_handle (e->session_handle);
970 fformat (stdout, "[%04d] disconnect session %d\n", i,
974 case FIFO_EVENT_BUILTIN_RX:
975 s0 = session_event_get_session (e, my_thread_index);
976 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
980 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
981 i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg));
985 fformat (stdout, "[%04d] unhandled event type %d\n",
992 if (index == mq->q->maxsize)
998 session_node_cmp_event (session_event_t * e, svm_fifo_t * f)
1000 stream_session_t *s;
1001 switch (e->event_type)
1003 case FIFO_EVENT_APP_RX:
1004 case FIFO_EVENT_APP_TX:
1005 case FIFO_EVENT_BUILTIN_RX:
1009 case FIFO_EVENT_DISCONNECT:
1011 case FIFO_EVENT_RPC:
1012 s = session_get_from_handle (e->session_handle);
1015 clib_warning ("session has event but doesn't exist!");
1018 if (s->server_rx_fifo == f || s->server_tx_fifo == f)
1028 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e)
1030 session_manager_main_t *smm = vnet_get_session_manager_main ();
1032 session_event_t *pending_event_vector, *evt;
1033 int i, index, found = 0;
1034 svm_msg_q_msg_t *msg;
1035 svm_msg_q_ring_t *ring;
1039 thread_index = f->master_thread_index;
1043 mq = smm->vpp_event_queues[thread_index];
1044 index = mq->q->head;
1045 for (i = 0; i < mq->q->cursize; i++)
1047 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
1048 ring = svm_msg_q_ring (mq, msg->ring_index);
1049 clib_memcpy (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
1050 found = session_node_cmp_event (e, f);
1053 if (++index == mq->q->maxsize)
1057 * Search pending events vector
1059 pending_event_vector = smm->pending_event_vector[thread_index];
1060 vec_foreach (evt, pending_event_vector)
1062 found = session_node_cmp_event (evt, f);
1065 clib_memcpy (e, evt, sizeof (*evt));
1072 static clib_error_t *
1073 session_queue_exit (vlib_main_t * vm)
1075 if (vec_len (vlib_mains) < 2)
1079 * Shut off (especially) worker-thread session nodes.
1080 * Otherwise, vpp can crash as the main thread unmaps the
1083 vlib_worker_thread_barrier_sync (vm);
1084 session_node_enable_disable (0 /* is_enable */ );
1085 vlib_worker_thread_barrier_release (vm);
1089 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1092 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1095 f64 now, timeout = 1.0;
1096 uword *event_data = 0;
1101 vlib_process_wait_for_event_or_clock (vm, timeout);
1102 now = vlib_time_now (vm);
1103 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1107 case SESSION_Q_PROCESS_FLUSH_FRAMES:
1108 /* Flush the frames by updating all transports times */
1109 transport_update_time (now, 0);
1111 case SESSION_Q_PROCESS_STOP:
1115 /* Timed out. Update time for all transports to trigger all
1116 * outstanding retransmits. */
1117 transport_update_time (now, 0);
1120 vec_reset_length (event_data);
1126 VLIB_REGISTER_NODE (session_queue_process_node) =
1128 .function = session_queue_process,
1129 .type = VLIB_NODE_TYPE_PROCESS,
1130 .name = "session-queue-process",
1131 .state = VLIB_NODE_STATE_DISABLED,
1137 * fd.io coding-style-patch-verification: ON
1140 * eval: (c-set-style "gnu")