2 * Copyright (c) 2017-2019 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/application_local.h>
25 #include <vnet/session/session_debug.h>
26 #include <svm/queue.h>
28 #define app_check_thread_and_barrier(_fn, _arg) \
29 if (!vlib_thread_is_main_w_barrier ()) \
31 vlib_rpc_call_main_thread (_fn, (u8 *) _arg, sizeof(*_arg)); \
36 session_mq_listen_handler (void *data)
38 session_listen_msg_t *mp = (session_listen_msg_t *) data;
39 vnet_listen_args_t _a, *a = &_a;
40 app_worker_t *app_wrk;
44 app_check_thread_and_barrier (session_mq_listen_handler, mp);
46 app = application_lookup (mp->client_index);
50 clib_memset (a, 0, sizeof (*a));
51 a->sep.is_ip4 = mp->is_ip4;
52 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
54 ip46_address_mask_ip4 (&a->sep.ip);
55 a->sep.port = mp->port;
56 a->sep.fib_index = mp->vrf;
57 a->sep.sw_if_index = ENDPOINT_INVALID_INDEX;
58 a->sep.transport_proto = mp->proto;
59 a->sep_ext.ckpair_index = mp->ckpair_index;
60 a->sep_ext.crypto_engine = mp->crypto_engine;
61 a->app_index = app->app_index;
62 a->wrk_map_index = mp->wrk_index;
64 if ((rv = vnet_listen (a)))
65 clib_warning ("listen returned: %d", rv);
67 app_wrk = application_get_worker (app, mp->wrk_index);
68 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
73 session_mq_listen_uri_handler (void *data)
75 session_listen_uri_msg_t *mp = (session_listen_uri_msg_t *) data;
76 vnet_listen_args_t _a, *a = &_a;
77 app_worker_t *app_wrk;
81 app_check_thread_and_barrier (session_mq_listen_uri_handler, mp);
83 app = application_lookup (mp->client_index);
87 clib_memset (a, 0, sizeof (*a));
88 a->uri = (char *) mp->uri;
89 a->app_index = app->app_index;
90 rv = vnet_bind_uri (a);
92 app_wrk = application_get_worker (app, 0);
93 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
97 session_mq_connect_handler (void *data)
99 session_connect_msg_t *mp = (session_connect_msg_t *) data;
100 vnet_connect_args_t _a, *a = &_a;
101 app_worker_t *app_wrk;
105 app_check_thread_and_barrier (session_mq_connect_handler, mp);
107 app = application_lookup (mp->client_index);
111 clib_memset (a, 0, sizeof (*a));
112 a->sep.is_ip4 = mp->is_ip4;
113 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
114 a->sep.port = mp->port;
115 a->sep.transport_proto = mp->proto;
116 a->sep.peer.fib_index = mp->vrf;
117 clib_memcpy_fast (&a->sep.peer.ip, &mp->lcl_ip, sizeof (mp->lcl_ip));
120 ip46_address_mask_ip4 (&a->sep.ip);
121 ip46_address_mask_ip4 (&a->sep.peer.ip);
123 a->sep.peer.port = mp->lcl_port;
124 a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX;
125 a->sep_ext.parent_handle = mp->parent_handle;
126 a->sep_ext.ckpair_index = mp->ckpair_index;
127 a->sep_ext.crypto_engine = mp->crypto_engine;
128 a->sep_ext.transport_flags = mp->flags;
129 if (mp->hostname_len)
131 vec_validate (a->sep_ext.hostname, mp->hostname_len - 1);
132 clib_memcpy_fast (a->sep_ext.hostname, mp->hostname, mp->hostname_len);
134 a->api_context = mp->context;
135 a->app_index = app->app_index;
136 a->wrk_map_index = mp->wrk_index;
138 if ((rv = vnet_connect (a)))
140 clib_warning ("connect returned: %U", format_session_error, rv);
141 app_wrk = application_get_worker (app, mp->wrk_index);
142 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
145 vec_free (a->sep_ext.hostname);
149 session_mq_connect_uri_handler (void *data)
151 session_connect_uri_msg_t *mp = (session_connect_uri_msg_t *) data;
152 vnet_connect_args_t _a, *a = &_a;
153 app_worker_t *app_wrk;
157 app_check_thread_and_barrier (session_mq_connect_uri_handler, mp);
159 app = application_lookup (mp->client_index);
163 clib_memset (a, 0, sizeof (*a));
164 a->uri = (char *) mp->uri;
165 a->api_context = mp->context;
166 a->app_index = app->app_index;
167 if ((rv = vnet_connect_uri (a)))
169 clib_warning ("connect_uri returned: %d", rv);
170 app_wrk = application_get_worker (app, 0 /* default wrk only */ );
171 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
176 session_mq_disconnect_handler (void *data)
178 session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data;
179 vnet_disconnect_args_t _a, *a = &_a;
182 app = application_lookup (mp->client_index);
186 a->app_index = app->app_index;
187 a->handle = mp->handle;
188 vnet_disconnect_session (a);
192 app_mq_detach_handler (void *data)
194 session_app_detach_msg_t *mp = (session_app_detach_msg_t *) data;
195 vnet_app_detach_args_t _a, *a = &_a;
198 app_check_thread_and_barrier (app_mq_detach_handler, mp);
200 app = application_lookup (mp->client_index);
204 a->app_index = app->app_index;
205 a->api_client_index = mp->client_index;
206 vnet_application_detach (a);
210 session_mq_unlisten_handler (void *data)
212 session_unlisten_msg_t *mp = (session_unlisten_msg_t *) data;
213 vnet_unlisten_args_t _a, *a = &_a;
214 app_worker_t *app_wrk;
218 app_check_thread_and_barrier (session_mq_unlisten_handler, mp);
220 app = application_lookup (mp->client_index);
224 clib_memset (a, 0, sizeof (*a));
225 a->app_index = app->app_index;
226 a->handle = mp->handle;
227 a->wrk_map_index = mp->wrk_index;
228 if ((rv = vnet_unlisten (a)))
229 clib_warning ("unlisten returned: %d", rv);
231 app_wrk = application_get_worker (app, a->wrk_map_index);
235 mq_send_unlisten_reply (app_wrk, mp->handle, mp->context, rv);
239 session_mq_accepted_reply_handler (void *data)
241 session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
242 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
243 session_state_t old_state;
244 app_worker_t *app_wrk;
247 /* Server isn't interested, kill the session */
250 a->app_index = mp->context;
251 a->handle = mp->handle;
252 vnet_disconnect_session (a);
256 /* Mail this back from the main thread. We're not polling in main
257 * thread so we're using other workers for notifications. */
258 if (vlib_num_workers () && vlib_get_thread_index () != 0
259 && session_thread_from_handle (mp->handle) == 0)
261 vlib_rpc_call_main_thread (session_mq_accepted_reply_handler,
262 (u8 *) mp, sizeof (*mp));
266 s = session_get_from_handle_if_valid (mp->handle);
270 app_wrk = app_worker_get (s->app_wrk_index);
271 if (app_wrk->app_index != mp->context)
273 clib_warning ("app doesn't own session");
277 if (!session_has_transport (s))
279 s->session_state = SESSION_STATE_READY;
280 if (ct_session_connect_notify (s))
285 old_state = s->session_state;
286 s->session_state = SESSION_STATE_READY;
288 if (!svm_fifo_is_empty_prod (s->rx_fifo))
289 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
291 /* Closed while waiting for app to reply. Resend disconnect */
292 if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
294 app_worker_close_notify (app_wrk, s);
295 s->session_state = old_state;
302 session_mq_reset_reply_handler (void *data)
304 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
305 session_reset_reply_msg_t *mp;
306 app_worker_t *app_wrk;
309 u32 index, thread_index;
311 mp = (session_reset_reply_msg_t *) data;
312 app = application_lookup (mp->context);
316 session_parse_handle (mp->handle, &index, &thread_index);
317 s = session_get_if_valid (index, thread_index);
319 /* No session or not the right session */
320 if (!s || s->session_state < SESSION_STATE_TRANSPORT_CLOSING)
323 app_wrk = app_worker_get (s->app_wrk_index);
324 if (!app_wrk || app_wrk->app_index != app->app_index)
326 clib_warning ("App %u does not own handle 0x%lx!", app->app_index,
331 /* Client objected to resetting the session, log and continue */
334 clib_warning ("client retval %d", mp->retval);
338 /* This comes as a response to a reset, transport only waiting for
339 * confirmation to remove connection state, no need to disconnect */
340 a->handle = mp->handle;
341 a->app_index = app->app_index;
342 vnet_disconnect_session (a);
346 session_mq_disconnected_handler (void *data)
348 session_disconnected_reply_msg_t *rmp;
349 vnet_disconnect_args_t _a, *a = &_a;
350 svm_msg_q_msg_t _msg, *msg = &_msg;
351 session_disconnected_msg_t *mp;
352 app_worker_t *app_wrk;
353 session_event_t *evt;
358 mp = (session_disconnected_msg_t *) data;
359 if (!(s = session_get_from_handle_if_valid (mp->handle)))
361 clib_warning ("could not disconnect handle %llu", mp->handle);
364 app_wrk = app_worker_get (s->app_wrk_index);
365 app = application_lookup (mp->client_index);
366 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
368 clib_warning ("could not disconnect session: %llu app: %u",
369 mp->handle, mp->client_index);
373 a->handle = mp->handle;
374 a->app_index = app_wrk->wrk_index;
375 rv = vnet_disconnect_session (a);
377 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
378 SESSION_MQ_CTRL_EVT_RING,
380 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
381 clib_memset (evt, 0, sizeof (*evt));
382 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
383 rmp = (session_disconnected_reply_msg_t *) evt->data;
384 rmp->handle = mp->handle;
385 rmp->context = mp->context;
387 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
391 session_mq_disconnected_reply_handler (void *data)
393 session_disconnected_reply_msg_t *mp;
394 vnet_disconnect_args_t _a, *a = &_a;
397 mp = (session_disconnected_reply_msg_t *) data;
399 /* Client objected to disconnecting the session, log and continue */
402 clib_warning ("client retval %d", mp->retval);
406 /* Disconnect has been confirmed. Confirm close to transport */
407 app = application_lookup (mp->context);
410 a->handle = mp->handle;
411 a->app_index = app->app_index;
412 vnet_disconnect_session (a);
417 session_mq_worker_update_handler (void *data)
419 session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
420 session_worker_update_reply_msg_t *rmp;
421 svm_msg_q_msg_t _msg, *msg = &_msg;
422 app_worker_t *app_wrk;
423 u32 owner_app_wrk_map;
424 session_event_t *evt;
428 app = application_lookup (mp->client_index);
431 if (!(s = session_get_from_handle_if_valid (mp->handle)))
433 clib_warning ("invalid handle %llu", mp->handle);
436 app_wrk = app_worker_get (s->app_wrk_index);
437 if (app_wrk->app_index != app->app_index)
439 clib_warning ("app %u does not own session %llu", app->app_index,
443 owner_app_wrk_map = app_wrk->wrk_map_index;
444 app_wrk = application_get_worker (app, mp->wrk_index);
446 /* This needs to come from the new owner */
447 if (mp->req_wrk_index == owner_app_wrk_map)
449 session_req_worker_update_msg_t *wump;
451 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
452 SESSION_MQ_CTRL_EVT_RING,
454 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
455 clib_memset (evt, 0, sizeof (*evt));
456 evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
457 wump = (session_req_worker_update_msg_t *) evt->data;
458 wump->session_handle = mp->handle;
459 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
463 app_worker_own_session (app_wrk, s);
468 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
469 SESSION_MQ_CTRL_EVT_RING,
471 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
472 clib_memset (evt, 0, sizeof (*evt));
473 evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
474 rmp = (session_worker_update_reply_msg_t *) evt->data;
475 rmp->handle = mp->handle;
476 rmp->rx_fifo = pointer_to_uword (s->rx_fifo);
477 rmp->tx_fifo = pointer_to_uword (s->tx_fifo);
478 rmp->segment_handle = session_segment_handle (s);
479 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
482 * Retransmit messages that may have been lost
484 if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
485 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
487 if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
488 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
490 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
491 app_worker_close_notify (app_wrk, s);
494 vlib_node_registration_t session_queue_node;
499 u32 server_thread_index;
500 } session_queue_trace_t;
502 /* packet trace format function */
504 format_session_queue_trace (u8 * s, va_list * args)
506 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
507 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
508 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
510 s = format (s, "session index %d thread index %d",
511 t->session_index, t->server_thread_index);
515 #define foreach_session_queue_error \
516 _(TX, "Packets transmitted") \
517 _(TIMER, "Timer events") \
518 _(NO_BUFFER, "Out of buffers")
522 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
523 foreach_session_queue_error
525 SESSION_QUEUE_N_ERROR,
526 } session_queue_error_t;
528 static char *session_queue_error_strings[] = {
529 #define _(sym,string) string,
530 foreach_session_queue_error
536 SESSION_TX_NO_BUFFERS = -2,
542 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
543 u32 next_index, u32 * to_next, u16 n_segs,
544 session_t * s, u32 n_trace)
546 session_queue_trace_t *t;
550 for (i = 0; i < clib_min (n_trace, n_segs); i++)
552 b = vlib_get_buffer (vm, to_next[i]);
553 vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ );
554 t = vlib_add_trace (vm, node, b, sizeof (*t));
555 t->session_index = s->session_index;
556 t->server_thread_index = s->thread_index;
558 vlib_set_trace_count (vm, node, n_trace - i);
562 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
563 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
565 vlib_buffer_t *chain_b, *prev_b;
566 u32 chain_bi0, to_deq, left_from_seg;
567 session_worker_t *wrk;
568 u16 len_to_deq, n_bytes_read;
571 wrk = session_main_get_worker (ctx->s->thread_index);
572 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
573 b->total_length_not_including_first_buffer = 0;
576 left_from_seg = clib_min (ctx->sp.snd_mss - b->current_length,
578 to_deq = left_from_seg;
579 for (j = 1; j < ctx->n_bufs_per_seg; j++)
582 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
585 chain_bi0 = wrk->tx_buffers[*n_bufs];
586 chain_b = vlib_get_buffer (vm, chain_bi0);
587 chain_b->current_data = 0;
588 data = vlib_buffer_get_current (chain_b);
591 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo,
592 ctx->sp.tx_offset, len_to_deq, data);
593 ctx->sp.tx_offset += n_bytes_read;
597 if (ctx->transport_vft->transport_options.tx_type ==
600 svm_fifo_t *f = ctx->s->tx_fifo;
601 session_dgram_hdr_t *hdr = &ctx->hdr;
603 deq_now = clib_min (hdr->data_length - hdr->data_offset,
605 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
607 ASSERT (n_bytes_read > 0);
609 hdr->data_offset += n_bytes_read;
610 if (hdr->data_offset == hdr->data_length)
612 u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
613 svm_fifo_dequeue_drop (f, offset);
614 if (ctx->left_to_snd > n_bytes_read)
615 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
618 else if (ctx->left_to_snd == n_bytes_read)
619 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
620 sizeof (session_dgram_pre_hdr_t));
623 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
626 ASSERT (n_bytes_read == len_to_deq);
627 chain_b->current_length = n_bytes_read;
628 b->total_length_not_including_first_buffer += chain_b->current_length;
630 /* update previous buffer */
631 prev_b->next_buffer = chain_bi0;
632 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
634 /* update current buffer */
635 chain_b->next_buffer = 0;
637 to_deq -= n_bytes_read;
642 && b->total_length_not_including_first_buffer == left_from_seg);
643 ctx->left_to_snd -= left_from_seg;
647 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
648 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
655 * Start with the first buffer in chain
658 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
661 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
662 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
666 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset,
668 ASSERT (n_bytes_read > 0);
669 /* Keep track of progress locally, transport is also supposed to
670 * increment it independently when pushing the header */
671 ctx->sp.tx_offset += n_bytes_read;
675 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
677 session_dgram_hdr_t *hdr = &ctx->hdr;
678 svm_fifo_t *f = ctx->s->tx_fifo;
682 ASSERT (hdr->data_length > hdr->data_offset);
683 deq_now = clib_min (hdr->data_length - hdr->data_offset,
685 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
686 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
687 ASSERT (n_bytes_read > 0);
689 if (ctx->s->session_state == SESSION_STATE_LISTENING)
691 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
692 ctx->tc->rmt_port = hdr->rmt_port;
694 hdr->data_offset += n_bytes_read;
695 if (hdr->data_offset == hdr->data_length)
697 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
698 svm_fifo_dequeue_drop (f, offset);
699 if (ctx->left_to_snd > n_bytes_read)
700 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
703 else if (ctx->left_to_snd == n_bytes_read)
704 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
705 sizeof (session_dgram_pre_hdr_t));
709 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
711 ASSERT (n_bytes_read > 0);
714 b->current_length = n_bytes_read;
715 ctx->left_to_snd -= n_bytes_read;
718 * Fill in the remaining buffers in the chain, if any
720 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
721 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
725 session_tx_not_ready (session_t * s, u8 peek_data)
729 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
731 /* Can retransmit for closed sessions but can't send new data if
732 * session is not ready or closed */
733 else if (s->session_state < SESSION_STATE_READY)
735 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
737 /* Allow closed transports to still send custom packets.
738 * For instance, tcp may want to send acks in time-wait. */
739 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
740 && (s->flags & SESSION_F_CUSTOM_TX))
748 always_inline transport_connection_t *
749 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
753 return ctx->transport_vft->get_connection (ctx->s->connection_index,
754 ctx->s->thread_index);
758 if (ctx->s->session_state == SESSION_STATE_LISTENING)
759 return ctx->transport_vft->get_listener (ctx->s->connection_index);
762 return ctx->transport_vft->get_connection (ctx->s->connection_index,
763 ctx->s->thread_index);
769 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
770 u32 max_segs, u8 peek_data)
772 u32 n_bytes_per_buf, n_bytes_per_seg;
774 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
775 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
779 /* Offset in rx fifo from where to peek data */
780 if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue))
782 ctx->max_len_to_snd = 0;
785 ctx->max_dequeue -= ctx->sp.tx_offset;
789 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
791 u32 len, chain_limit;
793 if (ctx->max_dequeue <= sizeof (ctx->hdr))
795 ctx->max_len_to_snd = 0;
799 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
801 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
802 len = ctx->hdr.data_length - ctx->hdr.data_offset;
804 /* Process multiple dgrams if smaller than min (buf_space, mss).
805 * This avoids handling multiple dgrams if they require buffer
807 chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN,
809 if (ctx->hdr.data_length <= chain_limit)
811 u32 first_dgram_len, dgram_len, offset, max_offset;
812 session_dgram_hdr_t hdr;
814 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len);
815 offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t);
816 first_dgram_len = len;
817 max_offset = clib_min (ctx->max_dequeue, 16 << 10);
819 while (offset < max_offset)
821 svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
823 ASSERT (hdr.data_length > hdr.data_offset);
824 dgram_len = hdr.data_length - hdr.data_offset;
825 if (len + dgram_len > ctx->max_dequeue
826 || first_dgram_len != dgram_len)
829 offset += sizeof (hdr) + hdr.data_length;
833 ctx->max_dequeue = len;
836 ASSERT (ctx->max_dequeue > 0);
838 /* Ensure we're not writing more than transport window allows */
839 if (ctx->max_dequeue < ctx->sp.snd_space)
841 /* Constrained by tx queue. Try to send only fully formed segments */
842 ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ?
843 (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) :
849 /* Expectation is that snd_space0 is already a multiple of snd_mss */
850 ctx->max_len_to_snd = ctx->sp.snd_space;
853 /* Check if we're tx constrained by the node */
854 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss);
855 if (ctx->n_segs_per_evt > max_segs)
857 ctx->n_segs_per_evt = max_segs;
858 ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss;
861 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
862 if (ctx->n_segs_per_evt > 1)
864 u32 n_bytes_last_seg, n_bufs_last_seg;
866 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss;
867 n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd
868 - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss);
869 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
870 n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf);
871 ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg)
876 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd;
877 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
878 ctx->n_bufs_needed = ctx->n_bufs_per_seg;
881 ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf);
882 ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss,
884 TRANSPORT_MAX_HDRS_LEN);
888 session_tx_maybe_reschedule (session_worker_t * wrk,
889 session_tx_context_t * ctx,
890 session_evt_elt_t * elt)
892 session_t *s = ctx->s;
894 svm_fifo_unset_event (s->tx_fifo);
895 if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset)
896 if (svm_fifo_set_event (s->tx_fifo))
897 session_evt_add_head_old (wrk, elt);
901 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
902 vlib_node_runtime_t * node,
903 session_evt_elt_t * elt,
904 int *n_tx_packets, u8 peek_data)
906 u32 n_trace, n_left, pbi, next_index, max_burst;
907 session_tx_context_t *ctx = &wrk->ctx;
908 session_main_t *smm = &session_main;
909 session_event_t *e = &elt->evt;
910 vlib_main_t *vm = wrk->vm;
911 transport_proto_t tp;
915 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
918 session_evt_add_old (wrk, elt);
919 return SESSION_TX_NO_DATA;
922 next_index = smm->session_type_to_next[ctx->s->session_type];
923 max_burst = VLIB_FRAME_SIZE - *n_tx_packets;
925 tp = session_get_transport_proto (ctx->s);
926 ctx->transport_vft = transport_protocol_get_vft (tp);
927 ctx->tc = session_tx_get_transport (ctx, peek_data);
929 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
931 if (ctx->transport_vft->flush_data)
932 ctx->transport_vft->flush_data (ctx->tc);
933 e->event_type = SESSION_IO_EVT_TX;
936 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
939 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
940 ctx->sp.max_burst_size = max_burst;
941 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp);
942 *n_tx_packets += n_custom_tx;
944 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
945 return SESSION_TX_OK;
946 max_burst -= n_custom_tx;
947 if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX))
949 session_evt_add_old (wrk, elt);
950 return SESSION_TX_OK;
954 transport_connection_snd_params (ctx->tc, &ctx->sp);
956 if (!ctx->sp.snd_space)
958 /* If the deschedule flag was set, remove session from scheduler.
959 * Transport is responsible for rescheduling this session. */
960 if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED)
961 transport_connection_deschedule (ctx->tc);
962 /* Request to postpone the session, e.g., zero-wnd and transport
963 * is not currently probing */
964 else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE)
965 session_evt_add_old (wrk, elt);
966 /* This flow queue is "empty" so it should be re-evaluated before
967 * the ones that have data to send. */
969 session_evt_add_head_old (wrk, elt);
971 return SESSION_TX_NO_DATA;
974 if (transport_connection_is_tx_paced (ctx->tc))
976 u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc);
977 if (snd_space < TRANSPORT_PACER_MIN_BURST)
979 session_evt_add_head_old (wrk, elt);
980 return SESSION_TX_NO_DATA;
982 snd_space = clib_min (ctx->sp.snd_space, snd_space);
983 ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ?
984 snd_space - snd_space % ctx->sp.snd_mss : snd_space;
987 /* Check how much we can pull. */
988 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
990 if (PREDICT_FALSE (!ctx->max_len_to_snd))
992 transport_connection_tx_pacer_reset_bucket (ctx->tc, 0);
993 session_tx_maybe_reschedule (wrk, ctx, elt);
994 return SESSION_TX_NO_DATA;
997 vec_validate_aligned (wrk->tx_buffers, ctx->n_bufs_needed - 1,
998 CLIB_CACHE_LINE_BYTES);
999 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, ctx->n_bufs_needed);
1000 if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed))
1003 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1004 session_evt_add_head_old (wrk, elt);
1005 vlib_node_increment_counter (wrk->vm, node->node_index,
1006 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
1007 return SESSION_TX_NO_BUFFERS;
1010 transport_connection_update_tx_bytes (ctx->tc, ctx->max_len_to_snd);
1012 ctx->left_to_snd = ctx->max_len_to_snd;
1013 n_left = ctx->n_segs_per_evt;
1017 vlib_buffer_t *b0, *b1;
1020 pbi = wrk->tx_buffers[n_bufs - 3];
1021 pb = vlib_get_buffer (vm, pbi);
1022 vlib_prefetch_buffer_header (pb, STORE);
1023 pbi = wrk->tx_buffers[n_bufs - 4];
1024 pb = vlib_get_buffer (vm, pbi);
1025 vlib_prefetch_buffer_header (pb, STORE);
1027 bi0 = wrk->tx_buffers[--n_bufs];
1028 bi1 = wrk->tx_buffers[--n_bufs];
1030 b0 = vlib_get_buffer (vm, bi0);
1031 b1 = vlib_get_buffer (vm, bi1);
1033 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1034 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
1036 ctx->transport_vft->push_header (ctx->tc, b0);
1037 ctx->transport_vft->push_header (ctx->tc, b1);
1041 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1042 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
1044 vec_add1 (wrk->pending_tx_buffers, bi0);
1045 vec_add1 (wrk->pending_tx_buffers, bi1);
1046 vec_add1 (wrk->pending_tx_nexts, next_index);
1047 vec_add1 (wrk->pending_tx_nexts, next_index);
1056 pbi = wrk->tx_buffers[n_bufs - 2];
1057 pb = vlib_get_buffer (vm, pbi);
1058 vlib_prefetch_buffer_header (pb, STORE);
1061 bi0 = wrk->tx_buffers[--n_bufs];
1062 b0 = vlib_get_buffer (vm, bi0);
1063 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1065 /* Ask transport to push header after current_length and
1066 * total_length_not_including_first_buffer are updated */
1067 ctx->transport_vft->push_header (ctx->tc, b0);
1071 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1073 vec_add1 (wrk->pending_tx_buffers, bi0);
1074 vec_add1 (wrk->pending_tx_nexts, next_index);
1077 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
1078 session_tx_trace_frame (vm, node, next_index, wrk->pending_tx_buffers,
1079 ctx->n_segs_per_evt, ctx->s, n_trace);
1081 if (PREDICT_FALSE (n_bufs))
1082 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1084 *n_tx_packets += ctx->n_segs_per_evt;
1086 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
1087 ctx->s->tx_fifo->has_event, wrk->last_vlib_time);
1089 ASSERT (ctx->left_to_snd == 0);
1091 /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise,
1092 * check if application enqueued more data and reschedule accordingly */
1093 if (ctx->max_len_to_snd < ctx->max_dequeue)
1094 session_evt_add_old (wrk, elt);
1096 session_tx_maybe_reschedule (wrk, ctx, elt);
1100 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, ctx->max_len_to_snd))
1101 session_dequeue_notify (ctx->s);
1103 return SESSION_TX_OK;
1107 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1108 vlib_node_runtime_t * node,
1109 session_evt_elt_t * e, int *n_tx_packets)
1111 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1115 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1116 vlib_node_runtime_t * node,
1117 session_evt_elt_t * e, int *n_tx_packets)
1119 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1123 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1124 vlib_node_runtime_t * node,
1125 session_evt_elt_t * elt, int *n_tx_packets)
1127 transport_send_params_t *sp = &wrk->ctx.sp;
1128 session_t *s = wrk->ctx.s;
1131 if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1134 /* Clear custom-tx flag used to request reschedule for tx */
1135 s->flags &= ~SESSION_F_CUSTOM_TX;
1137 sp->max_burst_size = clib_min (VLIB_FRAME_SIZE - *n_tx_packets,
1138 TRANSPORT_PACER_MAX_BURST_PKTS);
1140 n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp);
1141 *n_tx_packets += n_packets;
1143 if (s->flags & SESSION_F_CUSTOM_TX)
1145 session_evt_add_old (wrk, elt);
1147 else if (!(sp->flags & TRANSPORT_SND_F_DESCHED))
1149 svm_fifo_unset_event (s->tx_fifo);
1150 if (svm_fifo_max_dequeue_cons (s->tx_fifo))
1151 if (svm_fifo_set_event (s->tx_fifo))
1152 session_evt_add_head_old (wrk, elt);
1158 always_inline session_t *
1159 session_event_get_session (session_event_t * e, u8 thread_index)
1161 return session_get_if_valid (e->session_index, thread_index);
1165 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1167 clib_llist_index_t ei;
1168 void (*fp) (void *);
1172 ei = clib_llist_entry_index (wrk->event_elts, elt);
1175 switch (e->event_type)
1177 case SESSION_CTRL_EVT_RPC:
1178 fp = e->rpc_args.fp;
1179 (*fp) (e->rpc_args.arg);
1181 case SESSION_CTRL_EVT_CLOSE:
1182 s = session_get_from_handle_if_valid (e->session_handle);
1183 if (PREDICT_FALSE (!s))
1185 session_transport_close (s);
1187 case SESSION_CTRL_EVT_RESET:
1188 s = session_get_from_handle_if_valid (e->session_handle);
1189 if (PREDICT_FALSE (!s))
1191 session_transport_reset (s);
1193 case SESSION_CTRL_EVT_LISTEN:
1194 session_mq_listen_handler (session_evt_ctrl_data (wrk, elt));
1196 case SESSION_CTRL_EVT_LISTEN_URI:
1197 session_mq_listen_uri_handler (session_evt_ctrl_data (wrk, elt));
1199 case SESSION_CTRL_EVT_UNLISTEN:
1200 session_mq_unlisten_handler (session_evt_ctrl_data (wrk, elt));
1202 case SESSION_CTRL_EVT_CONNECT:
1203 session_mq_connect_handler (session_evt_ctrl_data (wrk, elt));
1205 case SESSION_CTRL_EVT_CONNECT_URI:
1206 session_mq_connect_uri_handler (session_evt_ctrl_data (wrk, elt));
1208 case SESSION_CTRL_EVT_DISCONNECT:
1209 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1211 case SESSION_CTRL_EVT_DISCONNECTED:
1212 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1214 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1215 session_mq_accepted_reply_handler (session_evt_ctrl_data (wrk, elt));
1217 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1218 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1221 case SESSION_CTRL_EVT_RESET_REPLY:
1222 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1224 case SESSION_CTRL_EVT_WORKER_UPDATE:
1225 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1227 case SESSION_CTRL_EVT_APP_DETACH:
1228 app_mq_detach_handler (session_evt_ctrl_data (wrk, elt));
1231 clib_warning ("unhandled event type %d", e->event_type);
1234 /* Regrab elements in case pool moved */
1235 elt = pool_elt_at_index (wrk->event_elts, ei);
1236 if (!clib_llist_elt_is_linked (elt, evt_list))
1239 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1240 session_evt_ctrl_data_free (wrk, elt);
1241 session_evt_elt_free (wrk, elt);
1243 SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk);
1247 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1248 session_evt_elt_t * elt, u32 thread_index,
1251 session_main_t *smm = &session_main;
1252 app_worker_t *app_wrk;
1253 clib_llist_index_t ei;
1257 ei = clib_llist_entry_index (wrk->event_elts, elt);
1260 switch (e->event_type)
1262 case SESSION_IO_EVT_TX_FLUSH:
1263 case SESSION_IO_EVT_TX:
1264 s = session_event_get_session (e, thread_index);
1265 if (PREDICT_FALSE (!s))
1267 CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1269 /* Spray packets in per session type frames, since they go to
1270 * different nodes */
1271 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1273 case SESSION_IO_EVT_RX:
1274 s = session_event_get_session (e, thread_index);
1277 transport_app_rx_evt (session_get_transport_proto (s),
1278 s->connection_index, s->thread_index);
1280 case SESSION_IO_EVT_BUILTIN_RX:
1281 s = session_event_get_session (e, thread_index);
1282 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1284 svm_fifo_unset_event (s->rx_fifo);
1285 app_wrk = app_worker_get (s->app_wrk_index);
1286 app_worker_builtin_rx (app_wrk, s);
1288 case SESSION_IO_EVT_BUILTIN_TX:
1289 s = session_get_from_handle_if_valid (e->session_handle);
1291 if (PREDICT_TRUE (s != 0))
1292 session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets);
1295 clib_warning ("unhandled event type %d", e->event_type);
1298 SESSION_EVT (SESSION_IO_EVT_COUNTS, e->event_type, 1, wrk);
1300 /* Regrab elements in case pool moved */
1301 elt = pool_elt_at_index (wrk->event_elts, ei);
1302 if (!clib_llist_elt_is_linked (elt, evt_list))
1303 session_evt_elt_free (wrk, elt);
1307 static const u32 session_evt_msg_sizes[] = {
1308 #define _(symc, sym) \
1309 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1310 foreach_session_ctrl_evt
1316 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1318 session_evt_elt_t *elt;
1320 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1322 elt = session_evt_alloc_ctrl (wrk);
1323 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1325 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1326 elt->evt.event_type = evt->event_type;
1327 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1328 session_evt_msg_sizes[evt->event_type]);
1332 /* Internal control events fit into io events footprint */
1333 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1338 elt = session_evt_alloc_new (wrk);
1339 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1344 session_flush_pending_tx_buffers (session_worker_t * wrk,
1345 vlib_node_runtime_t * node)
1347 vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
1348 wrk->pending_tx_nexts,
1349 vec_len (wrk->pending_tx_nexts));
1350 vec_reset_length (wrk->pending_tx_buffers);
1351 vec_reset_length (wrk->pending_tx_nexts);
1355 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1356 vlib_frame_t * frame)
1358 session_main_t *smm = vnet_get_session_main ();
1359 u32 thread_index = vm->thread_index, n_to_dequeue;
1360 session_worker_t *wrk = &smm->wrk[thread_index];
1361 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1362 clib_llist_index_t ei, next_ei, old_ti;
1363 svm_msg_q_msg_t _msg, *msg = &_msg;
1364 int i = 0, n_tx_packets;
1365 session_event_t *evt;
1368 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1370 wrk->last_vlib_time = vlib_time_now (vm);
1371 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
1374 * Update transport time
1376 transport_update_time (wrk->last_vlib_time, thread_index);
1377 n_tx_packets = vec_len (wrk->pending_tx_buffers);
1378 SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk);
1381 * Dequeue and handle new events
1384 /* Try to dequeue what is available. Don't wait for lock.
1385 * XXX: we may need priorities here */
1386 mq = wrk->vpp_event_queue;
1387 n_to_dequeue = svm_msg_q_size (mq);
1388 if (n_to_dequeue && svm_msg_q_try_lock (mq) == 0)
1390 for (i = 0; i < n_to_dequeue; i++)
1392 svm_msg_q_sub_w_lock (mq, msg);
1393 evt = svm_msg_q_msg_data (mq, msg);
1394 session_evt_add_to_list (wrk, evt);
1395 svm_msg_q_free_msg (mq, msg);
1397 svm_msg_q_unlock (mq);
1400 SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_to_dequeue, !i);
1403 * Handle control events
1406 ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head);
1409 clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({
1410 clib_llist_remove (wrk->event_elts, evt_list, elt);
1411 session_event_dispatch_ctrl (wrk, elt);
1415 SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk);
1418 * Handle the new io events.
1421 new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head);
1422 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1423 old_ti = clib_llist_prev_index (old_he, evt_list);
1425 ei = clib_llist_next_index (new_he, evt_list);
1426 while (ei != wrk->new_head && n_tx_packets < VLIB_FRAME_SIZE)
1428 elt = pool_elt_at_index (wrk->event_elts, ei);
1429 ei = clib_llist_next_index (elt, evt_list);
1430 clib_llist_remove (wrk->event_elts, evt_list, elt);
1431 session_event_dispatch_io (wrk, node, elt, thread_index, &n_tx_packets);
1434 SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk);
1437 * Handle the old io events, if we had any prior to processing the new ones
1440 if (old_ti != wrk->old_head)
1442 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1443 ei = clib_llist_next_index (old_he, evt_list);
1445 while (n_tx_packets < VLIB_FRAME_SIZE)
1447 elt = pool_elt_at_index (wrk->event_elts, ei);
1448 next_ei = clib_llist_next_index (elt, evt_list);
1449 clib_llist_remove (wrk->event_elts, evt_list, elt);
1451 session_event_dispatch_io (wrk, node, elt, thread_index,
1461 SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk);
1463 if (vec_len (wrk->pending_tx_buffers))
1464 session_flush_pending_tx_buffers (wrk, node);
1466 vlib_node_increment_counter (vm, session_queue_node.index,
1467 SESSION_QUEUE_ERROR_TX, n_tx_packets);
1469 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
1471 return n_tx_packets;
1475 VLIB_REGISTER_NODE (session_queue_node) =
1477 .function = session_queue_node_fn,
1478 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1479 .name = "session-queue",
1480 .format_trace = format_session_queue_trace,
1481 .type = VLIB_NODE_TYPE_INPUT,
1482 .n_errors = ARRAY_LEN (session_queue_error_strings),
1483 .error_strings = session_queue_error_strings,
1484 .state = VLIB_NODE_STATE_DISABLED,
1488 static clib_error_t *
1489 session_queue_exit (vlib_main_t * vm)
1491 if (vec_len (vlib_mains) < 2)
1495 * Shut off (especially) worker-thread session nodes.
1496 * Otherwise, vpp can crash as the main thread unmaps the
1499 vlib_worker_thread_barrier_sync (vm);
1500 session_node_enable_disable (0 /* is_enable */ );
1501 vlib_worker_thread_barrier_release (vm);
1505 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1508 session_queue_run_on_main (vlib_main_t * vm)
1510 vlib_node_runtime_t *node;
1512 node = vlib_node_get_runtime (vm, session_queue_node.index);
1513 return session_queue_node_fn (vm, node, 0);
1517 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1520 uword *event_data = 0;
1526 vlib_process_wait_for_event_or_clock (vm, timeout);
1527 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1531 case SESSION_Q_PROCESS_RUN_ON_MAIN:
1532 /* Run session queue node on main thread */
1533 session_queue_run_on_main (vm);
1535 case SESSION_Q_PROCESS_STOP:
1539 /* Timed out. Run on main to ensure all events are handled */
1540 session_queue_run_on_main (vm);
1543 vec_reset_length (event_data);
1549 VLIB_REGISTER_NODE (session_queue_process_node) =
1551 .function = session_queue_process,
1552 .type = VLIB_NODE_TYPE_PROCESS,
1553 .name = "session-queue-process",
1554 .state = VLIB_NODE_STATE_DISABLED,
1558 static_always_inline uword
1559 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1560 vlib_frame_t * frame)
1562 session_main_t *sm = &session_main;
1563 if (!sm->wrk[0].vpp_event_queue)
1565 node = vlib_node_get_runtime (vm, session_queue_node.index);
1566 return session_queue_node_fn (vm, node, frame);
1570 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
1572 .function = session_queue_pre_input_inline,
1573 .type = VLIB_NODE_TYPE_PRE_INPUT,
1574 .name = "session-queue-main",
1575 .state = VLIB_NODE_STATE_DISABLED,
1580 * fd.io coding-style-patch-verification: ON
1583 * eval: (c-set-style "gnu")