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;
32 app_worker_t *app_wrk;
36 /* Server isn't interested, kill the session */
39 a->app_index = mp->context;
40 a->handle = mp->handle;
41 vnet_disconnect_session (a);
45 if (session_handle_is_local (mp->handle))
47 ls = application_get_local_session_from_handle (mp->handle);
50 clib_warning ("unknown local handle 0x%lx", mp->handle);
53 app_wrk = app_worker_get (ls->app_wrk_index);
54 if (app_wrk->app_index != mp->context)
56 clib_warning ("server %u doesn't own local handle 0x%lx",
57 mp->context, mp->handle);
60 if (application_local_session_connect_notify (ls))
62 ls->session_state = SESSION_STATE_READY;
66 s = session_get_from_handle_if_valid (mp->handle);
69 clib_warning ("session doesn't exist");
72 app_wrk = app_worker_get (s->app_wrk_index);
73 if (app_wrk->app_index != mp->context)
75 clib_warning ("app doesn't own session");
78 s->session_state = SESSION_STATE_READY;
79 if (!svm_fifo_is_empty (s->server_rx_fifo))
80 app_worker_lock_and_send_event (app_wrk, s, FIFO_EVENT_APP_RX);
85 session_mq_reset_reply_handler (void *data)
87 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
88 session_reset_reply_msg_t *mp;
89 app_worker_t *app_wrk;
92 u32 index, thread_index;
94 mp = (session_reset_reply_msg_t *) data;
95 app = application_lookup (mp->client_index);
99 session_parse_handle (mp->handle, &index, &thread_index);
100 s = session_get_if_valid (index, thread_index);
103 SESSION_DBG ("Invalid session!");
106 app_wrk = app_worker_get (s->app_wrk_index);
107 if (!app_wrk || app_wrk->app_index != app->app_index)
109 clib_warning ("App % does not own handle 0x%lx!", app->app_index,
114 /* Client objected to resetting the session, log and continue */
117 clib_warning ("client retval %d", mp->retval);
121 /* This comes as a response to a reset, transport only waiting for
122 * confirmation to remove connection state, no need to disconnect */
123 a->handle = mp->handle;
124 a->app_index = app->app_index;
125 vnet_disconnect_session (a);
129 session_mq_disconnected_handler (void *data)
131 session_disconnected_reply_msg_t *rmp;
132 vnet_disconnect_args_t _a, *a = &_a;
133 svm_msg_q_msg_t _msg, *msg = &_msg;
134 session_disconnected_msg_t *mp;
135 app_worker_t *app_wrk;
136 session_event_t *evt;
141 mp = (session_disconnected_msg_t *) data;
142 if (!(s = session_get_from_handle_if_valid (mp->handle)))
144 clib_warning ("could not disconnect handle %llu", mp->handle);
147 app_wrk = app_worker_get (s->app_wrk_index);
148 app = application_lookup (mp->client_index);
149 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
151 clib_warning ("could not disconnect session: %llu app: %u",
152 mp->handle, mp->client_index);
156 a->handle = mp->handle;
157 a->app_index = app_wrk->wrk_index;
158 rv = vnet_disconnect_session (a);
160 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
161 SESSION_MQ_CTRL_EVT_RING,
163 svm_msg_q_unlock (app_wrk->event_queue);
164 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
165 clib_memset (evt, 0, sizeof (*evt));
166 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED;
167 rmp = (session_disconnected_reply_msg_t *) evt->data;
168 rmp->handle = mp->handle;
169 rmp->context = mp->context;
171 svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT);
175 session_mq_disconnected_reply_handler (void *data)
177 session_disconnected_reply_msg_t *mp;
178 vnet_disconnect_args_t _a, *a = &_a;
181 mp = (session_disconnected_reply_msg_t *) data;
183 /* Client objected to disconnecting the session, log and continue */
186 clib_warning ("client retval %d", mp->retval);
190 /* Disconnect has been confirmed. Confirm close to transport */
191 app = application_lookup (mp->context);
194 a->handle = mp->handle;
195 a->app_index = app->app_index;
196 vnet_disconnect_session (a);
200 vlib_node_registration_t session_queue_node;
205 u32 server_thread_index;
206 } session_queue_trace_t;
208 /* packet trace format function */
210 format_session_queue_trace (u8 * s, va_list * args)
212 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
213 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
214 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
216 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
217 t->session_index, t->server_thread_index);
221 #define foreach_session_queue_error \
222 _(TX, "Packets transmitted") \
223 _(TIMER, "Timer events") \
224 _(NO_BUFFER, "Out of buffers")
228 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
229 foreach_session_queue_error
231 SESSION_QUEUE_N_ERROR,
232 } session_queue_error_t;
234 static char *session_queue_error_strings[] = {
235 #define _(sym,string) string,
236 foreach_session_queue_error
242 SESSION_TX_NO_BUFFERS = -2,
248 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
249 u32 next_index, u32 * to_next, u16 n_segs,
250 stream_session_t * s, u32 n_trace)
252 session_queue_trace_t *t;
256 for (i = 0; i < clib_min (n_trace, n_segs); i++)
258 b = vlib_get_buffer (vm, to_next[i - n_segs]);
259 vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
260 t = vlib_add_trace (vm, node, b, sizeof (*t));
261 t->session_index = s->session_index;
262 t->server_thread_index = s->thread_index;
264 vlib_set_trace_count (vm, node, n_trace - i);
268 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
269 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
271 vlib_buffer_t *chain_b, *prev_b;
272 u32 chain_bi0, to_deq, left_from_seg;
273 session_manager_worker_t *wrk;
274 u16 len_to_deq, n_bytes_read;
277 wrk = session_manager_get_worker (ctx->s->thread_index);
278 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
279 b->total_length_not_including_first_buffer = 0;
282 left_from_seg = clib_min (ctx->snd_mss - b->current_length,
284 to_deq = left_from_seg;
285 for (j = 1; j < ctx->n_bufs_per_seg; j++)
288 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
291 chain_bi0 = wrk->tx_buffers[*n_bufs];
292 _vec_len (wrk->tx_buffers) = *n_bufs;
294 chain_b = vlib_get_buffer (vm, chain_bi0);
295 chain_b->current_data = 0;
296 data = vlib_buffer_get_current (chain_b);
299 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo,
300 ctx->tx_offset, len_to_deq, data);
301 ctx->tx_offset += n_bytes_read;
305 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
307 svm_fifo_t *f = ctx->s->server_tx_fifo;
308 session_dgram_hdr_t *hdr = &ctx->hdr;
310 deq_now = clib_min (hdr->data_length - hdr->data_offset,
312 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
314 ASSERT (n_bytes_read > 0);
316 hdr->data_offset += n_bytes_read;
317 if (hdr->data_offset == hdr->data_length)
319 u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
320 svm_fifo_dequeue_drop (f, offset);
324 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
327 ASSERT (n_bytes_read == len_to_deq);
328 chain_b->current_length = n_bytes_read;
329 b->total_length_not_including_first_buffer += chain_b->current_length;
331 /* update previous buffer */
332 prev_b->next_buffer = chain_bi0;
333 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
335 /* update current buffer */
336 chain_b->next_buffer = 0;
338 to_deq -= n_bytes_read;
343 && b->total_length_not_including_first_buffer == left_from_seg);
344 ctx->left_to_snd -= left_from_seg;
348 session_output_try_get_buffers (vlib_main_t * vm,
349 session_manager_worker_t * wrk,
350 u32 thread_index, u16 * n_bufs, u32 wanted)
353 vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES);
354 n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs],
357 _vec_len (wrk->tx_buffers) = *n_bufs;
362 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
363 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
370 * Start with the first buffer in chain
373 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
376 data0 = vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
377 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
381 n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo, ctx->tx_offset,
383 ASSERT (n_bytes_read > 0);
384 /* Keep track of progress locally, transport is also supposed to
385 * increment it independently when pushing the header */
386 ctx->tx_offset += n_bytes_read;
390 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
392 session_dgram_hdr_t *hdr = &ctx->hdr;
393 svm_fifo_t *f = ctx->s->server_tx_fifo;
397 ASSERT (hdr->data_length > hdr->data_offset);
398 deq_now = clib_min (hdr->data_length - hdr->data_offset,
400 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
401 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
402 ASSERT (n_bytes_read > 0);
404 if (ctx->s->session_state == SESSION_STATE_LISTENING)
406 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
407 ctx->tc->rmt_port = hdr->rmt_port;
409 hdr->data_offset += n_bytes_read;
410 if (hdr->data_offset == hdr->data_length)
412 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
413 svm_fifo_dequeue_drop (f, offset);
418 n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo,
420 ASSERT (n_bytes_read > 0);
423 b->current_length = n_bytes_read;
424 ctx->left_to_snd -= n_bytes_read;
427 * Fill in the remaining buffers in the chain, if any
429 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
430 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
433 SESSION_EVT_DBG(SESSION_EVT_DEQ, ctx->s, ({
434 ed->data[0] = FIFO_EVENT_APP_TX;
435 ed->data[1] = ctx->max_dequeue;
436 ed->data[2] = len_to_deq;
437 ed->data[3] = ctx->left_to_snd;
443 session_tx_not_ready (stream_session_t * s, u8 peek_data)
447 /* Can retransmit for closed sessions but can't send new data if
448 * session is not ready or closed */
449 if (s->session_state < SESSION_STATE_READY)
451 if (s->session_state == SESSION_STATE_CLOSED)
457 always_inline transport_connection_t *
458 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
462 return ctx->transport_vft->get_connection (ctx->s->connection_index,
463 ctx->s->thread_index);
467 if (ctx->s->session_state == SESSION_STATE_LISTENING)
468 return ctx->transport_vft->get_listener (ctx->s->connection_index);
471 return ctx->transport_vft->get_connection (ctx->s->connection_index,
472 ctx->s->thread_index);
478 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
479 u32 max_segs, u8 peek_data)
481 u32 n_bytes_per_buf, n_bytes_per_seg;
482 ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo);
485 /* Offset in rx fifo from where to peek data */
486 ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc);
487 if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue))
489 ctx->max_len_to_snd = 0;
492 ctx->max_dequeue -= ctx->tx_offset;
496 if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
498 if (ctx->max_dequeue <= sizeof (ctx->hdr))
500 ctx->max_len_to_snd = 0;
503 svm_fifo_peek (ctx->s->server_tx_fifo, 0, sizeof (ctx->hdr),
505 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
506 ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset;
509 ASSERT (ctx->max_dequeue > 0);
511 /* Ensure we're not writing more than transport window allows */
512 if (ctx->max_dequeue < ctx->snd_space)
514 /* Constrained by tx queue. Try to send only fully formed segments */
515 ctx->max_len_to_snd =
516 (ctx->max_dequeue > ctx->snd_mss) ?
517 ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue;
522 /* Expectation is that snd_space0 is already a multiple of snd_mss */
523 ctx->max_len_to_snd = ctx->snd_space;
526 /* Check if we're tx constrained by the node */
527 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
528 if (ctx->n_segs_per_evt > max_segs)
530 ctx->n_segs_per_evt = max_segs;
531 ctx->max_len_to_snd = max_segs * ctx->snd_mss;
534 n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm,
535 VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
536 ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
537 n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss;
538 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
539 ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
540 ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
541 n_bytes_per_buf - MAX_HDRS_LEN);
545 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
547 stream_session_t * s, int *n_tx_packets,
550 u32 next_index, next0, next1, *to_next, n_left_to_next;
551 u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
552 u32 thread_index = s->thread_index, n_left, pbi;
553 session_manager_main_t *smm = &session_manager_main;
554 session_manager_worker_t *wrk = &smm->wrk[thread_index];
555 session_tx_context_t *ctx = &wrk->ctx;
556 transport_proto_t tp;
560 if (PREDICT_FALSE ((rv = session_tx_not_ready (s, peek_data))))
563 vec_add1 (wrk->pending_event_vector, *e);
564 return SESSION_TX_NO_DATA;
567 next_index = smm->session_type_to_next[s->session_type];
568 next0 = next1 = next_index;
570 tp = session_get_transport_proto (s);
572 ctx->transport_vft = transport_protocol_get_vft (tp);
573 ctx->tc = session_tx_get_transport (ctx, peek_data);
574 ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc);
576 transport_connection_snd_space (ctx->tc, vm->clib_time.last_cpu_time,
578 if (ctx->snd_space == 0 || ctx->snd_mss == 0)
580 vec_add1 (wrk->pending_event_vector, *e);
581 return SESSION_TX_NO_DATA;
584 /* Allow enqueuing of a new event */
585 svm_fifo_unset_event (s->server_tx_fifo);
587 /* Check how much we can pull. */
588 session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
591 if (PREDICT_FALSE (!ctx->max_len_to_snd))
592 return SESSION_TX_NO_DATA;
594 n_bufs = vec_len (wrk->tx_buffers);
595 n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
598 * Make sure we have at least one full frame of buffers ready
600 if (n_bufs < n_bufs_needed)
602 session_output_try_get_buffers (vm, wrk, thread_index, &n_bufs,
603 ctx->n_bufs_per_seg * VLIB_FRAME_SIZE);
604 if (PREDICT_FALSE (n_bufs < n_bufs_needed))
606 vec_add1 (wrk->pending_event_vector, *e);
607 return SESSION_TX_NO_BUFFERS;
612 * Write until we fill up a frame
614 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
615 if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
617 ctx->n_segs_per_evt = n_left_to_next;
618 ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
620 ctx->left_to_snd = ctx->max_len_to_snd;
621 n_left = ctx->n_segs_per_evt;
625 vlib_buffer_t *b0, *b1;
628 pbi = wrk->tx_buffers[n_bufs - 3];
629 pb = vlib_get_buffer (vm, pbi);
630 vlib_prefetch_buffer_header (pb, STORE);
631 pbi = wrk->tx_buffers[n_bufs - 4];
632 pb = vlib_get_buffer (vm, pbi);
633 vlib_prefetch_buffer_header (pb, STORE);
635 to_next[0] = bi0 = wrk->tx_buffers[--n_bufs];
636 to_next[1] = bi1 = wrk->tx_buffers[--n_bufs];
638 b0 = vlib_get_buffer (vm, bi0);
639 b1 = vlib_get_buffer (vm, bi1);
641 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
642 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
644 ctx->transport_vft->push_header (ctx->tc, b0);
645 ctx->transport_vft->push_header (ctx->tc, b1);
651 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
652 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
654 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
655 n_left_to_next, bi0, bi1, next0,
665 pbi = wrk->tx_buffers[n_bufs - 2];
666 pb = vlib_get_buffer (vm, pbi);
667 vlib_prefetch_buffer_header (pb, STORE);
670 to_next[0] = bi0 = wrk->tx_buffers[--n_bufs];
671 b0 = vlib_get_buffer (vm, bi0);
672 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
674 /* Ask transport to push header after current_length and
675 * total_length_not_including_first_buffer are updated */
676 ctx->transport_vft->push_header (ctx->tc, b0);
682 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
684 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
685 n_left_to_next, bi0, next0);
688 if (PREDICT_FALSE (n_trace > 0))
689 session_tx_trace_frame (vm, node, next_index, to_next,
690 ctx->n_segs_per_evt, s, n_trace);
692 _vec_len (wrk->tx_buffers) = n_bufs;
693 *n_tx_packets += ctx->n_segs_per_evt;
694 transport_connection_update_tx_stats (ctx->tc, ctx->max_len_to_snd);
695 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
697 /* If we couldn't dequeue all bytes mark as partially read */
698 ASSERT (ctx->left_to_snd == 0);
699 if (ctx->max_len_to_snd < ctx->max_dequeue)
700 if (svm_fifo_set_event (s->server_tx_fifo))
701 vec_add1 (wrk->pending_event_vector, *e);
703 if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM)
705 /* Fix dgram pre header */
706 if (ctx->max_len_to_snd < ctx->max_dequeue)
707 svm_fifo_overwrite_head (s->server_tx_fifo, (u8 *) & ctx->hdr,
708 sizeof (session_dgram_pre_hdr_t));
709 /* More data needs to be read */
710 else if (svm_fifo_max_dequeue (s->server_tx_fifo) > 0)
711 if (svm_fifo_set_event (s->server_tx_fifo))
712 vec_add1 (wrk->pending_event_vector, *e);
714 return SESSION_TX_OK;
718 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
720 stream_session_t * s, int *n_tx_pkts)
722 return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 1);
726 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
728 stream_session_t * s, int *n_tx_pkts)
730 return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 0);
734 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
735 vlib_node_runtime_t * node,
737 stream_session_t * s, int *n_tx_pkts)
740 if (PREDICT_FALSE (s->session_state == SESSION_STATE_CLOSED))
742 app = application_get (s->t_app_index);
743 svm_fifo_unset_event (s->server_tx_fifo);
744 return app->cb_fns.builtin_app_tx_callback (s);
747 always_inline stream_session_t *
748 session_event_get_session (session_event_t * e, u8 thread_index)
750 return session_get_if_valid (e->fifo->master_session_index, thread_index);
754 session_update_dispatch_period (session_manager_worker_t * wrk, f64 now,
757 if (wrk->last_tx_packets)
759 f64 sample = now - wrk->last_vlib_time;
760 wrk->dispatch_period = (wrk->dispatch_period + sample) * 0.5;
762 wrk->last_vlib_time = now;
766 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
767 vlib_frame_t * frame)
769 session_manager_main_t *smm = vnet_get_session_manager_main ();
770 u32 thread_index = vm->thread_index, n_to_dequeue, n_events;
771 session_manager_worker_t *wrk = &smm->wrk[thread_index];
772 session_event_t *e, *fifo_events;
773 svm_msg_q_msg_t _msg, *msg = &_msg;
774 f64 now = vlib_time_now (vm);
775 int n_tx_packets = 0, i, rv;
776 app_worker_t *app_wrk;
781 SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
784 * Update transport time
786 session_update_dispatch_period (wrk, now, thread_index);
787 transport_update_time (now, thread_index);
789 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
791 /* Make sure postponed events are handled first */
792 fifo_events = wrk->free_event_vector;
793 vec_append (fifo_events, wrk->postponed_event_vector);
794 _vec_len (wrk->postponed_event_vector) = 0;
796 /* Try to dequeue what is available. Don't wait for lock.
797 * XXX: we may need priorities here */
798 mq = wrk->vpp_event_queue;
799 n_to_dequeue = svm_msg_q_size (mq);
800 if (n_to_dequeue && svm_msg_q_try_lock (mq) == 0)
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_fast (e, svm_msg_q_msg_data (mq, msg), sizeof (*e));
807 svm_msg_q_free_msg (mq, msg);
809 svm_msg_q_unlock (mq);
812 vec_append (fifo_events, wrk->pending_event_vector);
813 vec_append (fifo_events, wrk->pending_disconnects);
815 _vec_len (wrk->pending_event_vector) = 0;
816 _vec_len (wrk->pending_disconnects) = 0;
818 n_events = vec_len (fifo_events);
819 if (PREDICT_FALSE (!n_events))
822 for (i = 0; i < n_events; i++)
824 stream_session_t *s; /* $$$ prefetch 1 ahead maybe */
829 switch (e->event_type)
831 case FIFO_EVENT_APP_TX:
832 /* Don't try to send more that one frame per dispatch cycle */
833 if (n_tx_packets == VLIB_FRAME_SIZE)
835 vec_add1 (wrk->postponed_event_vector, *e);
839 s = session_event_get_session (e, thread_index);
840 if (PREDICT_FALSE (!s))
842 clib_warning ("session was freed!");
846 want_tx_evt = svm_fifo_want_tx_evt (s->server_tx_fifo);
847 /* Spray packets in per session type frames, since they go to
849 rv = (smm->session_tx_fns[s->session_type]) (vm, node, e, s,
851 if (PREDICT_TRUE (rv == SESSION_TX_OK))
853 if (PREDICT_FALSE (want_tx_evt))
855 svm_fifo_set_want_tx_evt (s->server_tx_fifo, 0);
856 session_dequeue_notify (s);
859 else if (PREDICT_FALSE (rv == SESSION_TX_NO_BUFFERS))
861 vlib_node_increment_counter (vm, node->node_index,
862 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
866 case FIFO_EVENT_DISCONNECT:
867 /* Make sure stream disconnects run after the pending list is
869 s = session_get_from_handle (e->session_handle);
873 vec_add1 (wrk->pending_disconnects, *e);
876 /* If tx queue is still not empty, wait */
877 if (svm_fifo_max_dequeue (s->server_tx_fifo))
879 vec_add1 (wrk->pending_disconnects, *e);
883 stream_session_disconnect_transport (s);
885 case FIFO_EVENT_BUILTIN_RX:
886 s = session_event_get_session (e, thread_index);
887 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
889 svm_fifo_unset_event (s->server_rx_fifo);
890 app_wrk = app_worker_get (s->app_wrk_index);
891 app = application_get (app_wrk->app_index);
892 app->cb_fns.builtin_app_rx_callback (s);
894 case FIFO_EVENT_BUILTIN_TX:
895 s = session_get_from_handle_if_valid (e->session_handle);
896 if (PREDICT_TRUE (s != 0))
897 session_tx_fifo_dequeue_internal (vm, node, e, s, &n_tx_packets);
901 (*fp) (e->rpc_args.arg);
903 case SESSION_CTRL_EVT_DISCONNECTED:
904 session_mq_disconnected_handler (e->data);
906 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
907 session_mq_accepted_reply_handler (e->data);
909 case SESSION_CTRL_EVT_CONNECTED_REPLY:
911 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
912 session_mq_disconnected_reply_handler (e->data);
914 case SESSION_CTRL_EVT_RESET_REPLY:
915 session_mq_reset_reply_handler (e->data);
918 clib_warning ("unhandled event type %d", e->event_type);
922 _vec_len (fifo_events) = 0;
923 wrk->free_event_vector = fifo_events;
924 wrk->last_tx_packets = n_tx_packets;
926 vlib_node_increment_counter (vm, session_queue_node.index,
927 SESSION_QUEUE_ERROR_TX, n_tx_packets);
929 SESSION_EVT_DBG (SESSION_EVT_DISPATCH_END, smm, thread_index);
935 VLIB_REGISTER_NODE (session_queue_node) =
937 .function = session_queue_node_fn,
938 .name = "session-queue",
939 .format_trace = format_session_queue_trace,
940 .type = VLIB_NODE_TYPE_INPUT,
941 .n_errors = ARRAY_LEN (session_queue_error_strings),
942 .error_strings = session_queue_error_strings,
943 .state = VLIB_NODE_STATE_DISABLED,
948 dump_thread_0_event_queue (void)
950 session_manager_main_t *smm = vnet_get_session_manager_main ();
951 vlib_main_t *vm = &vlib_global_main;
952 u32 my_thread_index = vm->thread_index;
953 session_event_t _e, *e = &_e;
954 svm_msg_q_ring_t *ring;
955 stream_session_t *s0;
956 svm_msg_q_msg_t *msg;
960 mq = smm->wrk[my_thread_index].vpp_event_queue;
963 for (i = 0; i < mq->q->cursize; i++)
965 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
966 ring = svm_msg_q_ring (mq, msg->ring_index);
967 clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
969 switch (e->event_type)
971 case FIFO_EVENT_APP_TX:
972 s0 = session_event_get_session (e, my_thread_index);
973 fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index);
976 case FIFO_EVENT_DISCONNECT:
977 s0 = session_get_from_handle (e->session_handle);
978 fformat (stdout, "[%04d] disconnect session %d\n", i,
982 case FIFO_EVENT_BUILTIN_RX:
983 s0 = session_event_get_session (e, my_thread_index);
984 fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index);
988 fformat (stdout, "[%04d] RPC call %llx with %llx\n",
989 i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg));
993 fformat (stdout, "[%04d] unhandled event type %d\n",
1000 if (index == mq->q->maxsize)
1006 session_node_cmp_event (session_event_t * e, svm_fifo_t * f)
1008 stream_session_t *s;
1009 switch (e->event_type)
1011 case FIFO_EVENT_APP_RX:
1012 case FIFO_EVENT_APP_TX:
1013 case FIFO_EVENT_BUILTIN_RX:
1017 case FIFO_EVENT_DISCONNECT:
1019 case FIFO_EVENT_RPC:
1020 s = session_get_from_handle (e->session_handle);
1023 clib_warning ("session has event but doesn't exist!");
1026 if (s->server_rx_fifo == f || s->server_tx_fifo == f)
1036 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e)
1038 session_event_t *pending_event_vector, *evt;
1039 session_manager_worker_t *wrk;
1040 int i, index, found = 0;
1041 svm_msg_q_msg_t *msg;
1042 svm_msg_q_ring_t *ring;
1047 thread_index = f->master_thread_index;
1048 wrk = session_manager_get_worker (thread_index);
1053 mq = wrk->vpp_event_queue;
1054 index = mq->q->head;
1055 for (i = 0; i < mq->q->cursize; i++)
1057 msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index);
1058 ring = svm_msg_q_ring (mq, msg->ring_index);
1059 clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize);
1060 found = session_node_cmp_event (e, f);
1063 if (++index == mq->q->maxsize)
1067 * Search pending events vector
1069 pending_event_vector = wrk->pending_event_vector;
1070 vec_foreach (evt, pending_event_vector)
1072 found = session_node_cmp_event (evt, f);
1075 clib_memcpy_fast (e, evt, sizeof (*evt));
1082 static clib_error_t *
1083 session_queue_exit (vlib_main_t * vm)
1085 if (vec_len (vlib_mains) < 2)
1089 * Shut off (especially) worker-thread session nodes.
1090 * Otherwise, vpp can crash as the main thread unmaps the
1093 vlib_worker_thread_barrier_sync (vm);
1094 session_node_enable_disable (0 /* is_enable */ );
1095 vlib_worker_thread_barrier_release (vm);
1099 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1102 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1105 f64 now, timeout = 1.0;
1106 uword *event_data = 0;
1111 vlib_process_wait_for_event_or_clock (vm, timeout);
1112 now = vlib_time_now (vm);
1113 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1117 case SESSION_Q_PROCESS_FLUSH_FRAMES:
1118 /* Flush the frames by updating all transports times */
1119 transport_update_time (now, 0);
1121 case SESSION_Q_PROCESS_STOP:
1125 /* Timed out. Update time for all transports to trigger all
1126 * outstanding retransmits. */
1127 transport_update_time (now, 0);
1130 vec_reset_length (event_data);
1136 VLIB_REGISTER_NODE (session_queue_process_node) =
1138 .function = session_queue_process,
1139 .type = VLIB_NODE_TYPE_PROCESS,
1140 .name = "session-queue-process",
1141 .state = VLIB_NODE_STATE_DISABLED,
1147 * fd.io coding-style-patch-verification: ON
1150 * eval: (c-set-style "gnu")