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>
27 #include <sys/timerfd.h>
29 #define app_check_thread_and_barrier(_fn, _arg) \
30 if (!vlib_thread_is_main_w_barrier ()) \
32 vlib_rpc_call_main_thread (_fn, (u8 *) _arg, sizeof(*_arg)); \
36 static transport_endpt_ext_cfg_t *
37 session_mq_get_ext_config (application_t *app, uword offset)
42 fs = application_get_rx_mqs_segment (app);
43 c = fs_chunk_ptr (fs->h, offset);
44 return (transport_endpt_ext_cfg_t *) c->data;
48 session_mq_free_ext_config (application_t *app, uword offset)
53 fs = application_get_rx_mqs_segment (app);
54 c = fs_chunk_ptr (fs->h, offset);
55 fifo_segment_collect_chunk (fs, 0 /* only one slice */, c);
59 session_mq_listen_handler (void *data)
61 session_listen_msg_t *mp = (session_listen_msg_t *) data;
62 vnet_listen_args_t _a, *a = &_a;
63 app_worker_t *app_wrk;
67 app_check_thread_and_barrier (session_mq_listen_handler, mp);
69 app = application_lookup (mp->client_index);
73 clib_memset (a, 0, sizeof (*a));
74 a->sep.is_ip4 = mp->is_ip4;
75 ip_copy (&a->sep.ip, &mp->ip, mp->is_ip4);
76 a->sep.port = mp->port;
77 a->sep.fib_index = mp->vrf;
78 a->sep.sw_if_index = ENDPOINT_INVALID_INDEX;
79 a->sep.transport_proto = mp->proto;
80 a->app_index = app->app_index;
81 a->wrk_map_index = mp->wrk_index;
82 a->sep_ext.transport_flags = mp->flags;
85 a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config);
87 if ((rv = vnet_listen (a)))
88 clib_warning ("listen returned: %U", format_session_error, rv);
90 app_wrk = application_get_worker (app, mp->wrk_index);
91 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
94 session_mq_free_ext_config (app, mp->ext_config);
98 session_mq_listen_uri_handler (void *data)
100 session_listen_uri_msg_t *mp = (session_listen_uri_msg_t *) data;
101 vnet_listen_args_t _a, *a = &_a;
102 app_worker_t *app_wrk;
106 app_check_thread_and_barrier (session_mq_listen_uri_handler, mp);
108 app = application_lookup (mp->client_index);
112 clib_memset (a, 0, sizeof (*a));
113 a->uri = (char *) mp->uri;
114 a->app_index = app->app_index;
115 rv = vnet_bind_uri (a);
117 app_wrk = application_get_worker (app, 0);
118 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
122 session_mq_connect_one (session_connect_msg_t *mp)
124 vnet_connect_args_t _a, *a = &_a;
125 app_worker_t *app_wrk;
129 app = application_lookup (mp->client_index);
133 clib_memset (a, 0, sizeof (*a));
134 a->sep.is_ip4 = mp->is_ip4;
135 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
136 a->sep.port = mp->port;
137 a->sep.transport_proto = mp->proto;
138 a->sep.peer.fib_index = mp->vrf;
139 clib_memcpy_fast (&a->sep.peer.ip, &mp->lcl_ip, sizeof (mp->lcl_ip));
142 ip46_address_mask_ip4 (&a->sep.ip);
143 ip46_address_mask_ip4 (&a->sep.peer.ip);
145 a->sep.peer.port = mp->lcl_port;
146 a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX;
147 a->sep_ext.parent_handle = mp->parent_handle;
148 a->sep_ext.transport_flags = mp->flags;
149 a->api_context = mp->context;
150 a->app_index = app->app_index;
151 a->wrk_map_index = mp->wrk_index;
154 a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config);
156 if ((rv = vnet_connect (a)))
158 clib_warning ("connect returned: %U", format_session_error, rv);
159 app_wrk = application_get_worker (app, mp->wrk_index);
160 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
164 session_mq_free_ext_config (app, mp->ext_config);
168 session_mq_handle_connects_rpc (void *arg)
170 u32 max_connects = 32, n_connects = 0;
171 vlib_main_t *vm = vlib_get_main ();
172 session_evt_elt_t *he, *elt, *next;
173 session_worker_t *fwrk;
174 u8 need_reschedule = 1;
176 ASSERT (vlib_get_thread_index () == 0);
178 /* Pending connects on linked list pertaining to first worker */
179 fwrk = session_main_get_worker (1);
181 vlib_worker_thread_barrier_sync (vm);
183 he = pool_elt_at_index (fwrk->event_elts, fwrk->pending_connects);
184 elt = clib_llist_next (fwrk->event_elts, evt_list, he);
186 /* Avoid holding the barrier for too long */
187 while (n_connects < max_connects && elt != he)
189 next = clib_llist_next (fwrk->event_elts, evt_list, elt);
190 clib_llist_remove (fwrk->event_elts, evt_list, elt);
191 session_mq_connect_one (session_evt_ctrl_data (fwrk, elt));
192 session_evt_elt_free (fwrk, elt);
197 if (clib_llist_is_empty (fwrk->event_elts, evt_list, he))
199 fwrk->pending_connects_ntf = 0;
203 vlib_worker_thread_barrier_release (vm);
207 vlib_node_set_interrupt_pending (vm, session_queue_node.index);
208 elt = session_evt_alloc_ctrl (session_main_get_worker (0));
209 elt->evt.event_type = SESSION_CTRL_EVT_RPC;
210 elt->evt.rpc_args.fp = session_mq_handle_connects_rpc;
215 session_mq_connect_handler (session_worker_t *wrk, session_evt_elt_t *elt)
217 u32 thread_index = wrk - session_main.wrk;
218 session_evt_elt_t *he;
220 /* No workers, so just deal with the connect now */
221 if (PREDICT_FALSE (!thread_index))
223 session_mq_connect_one (session_evt_ctrl_data (wrk, elt));
227 if (PREDICT_FALSE (thread_index != 1))
229 clib_warning ("Connect on wrong thread. Dropping");
233 /* Add to pending list to be handled by main thread */
234 he = pool_elt_at_index (wrk->event_elts, wrk->pending_connects);
235 clib_llist_add_tail (wrk->event_elts, evt_list, elt, he);
237 if (!wrk->pending_connects_ntf)
239 vlib_node_set_interrupt_pending (vlib_get_main_by_index (0),
240 session_queue_node.index);
241 session_send_rpc_evt_to_thread (0, session_mq_handle_connects_rpc, 0);
242 wrk->pending_connects_ntf = 1;
247 session_mq_connect_uri_handler (void *data)
249 session_connect_uri_msg_t *mp = (session_connect_uri_msg_t *) data;
250 vnet_connect_args_t _a, *a = &_a;
251 app_worker_t *app_wrk;
255 app_check_thread_and_barrier (session_mq_connect_uri_handler, mp);
257 app = application_lookup (mp->client_index);
261 clib_memset (a, 0, sizeof (*a));
262 a->uri = (char *) mp->uri;
263 a->api_context = mp->context;
264 a->app_index = app->app_index;
265 if ((rv = vnet_connect_uri (a)))
267 clib_warning ("connect_uri returned: %d", rv);
268 app_wrk = application_get_worker (app, 0 /* default wrk only */ );
269 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
274 session_mq_shutdown_handler (void *data)
276 session_shutdown_msg_t *mp = (session_shutdown_msg_t *) data;
277 vnet_shutdown_args_t _a, *a = &_a;
280 app = application_lookup (mp->client_index);
284 a->app_index = app->app_index;
285 a->handle = mp->handle;
286 vnet_shutdown_session (a);
290 session_mq_disconnect_handler (void *data)
292 session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data;
293 vnet_disconnect_args_t _a, *a = &_a;
296 app = application_lookup (mp->client_index);
300 a->app_index = app->app_index;
301 a->handle = mp->handle;
302 vnet_disconnect_session (a);
306 app_mq_detach_handler (void *data)
308 session_app_detach_msg_t *mp = (session_app_detach_msg_t *) data;
309 vnet_app_detach_args_t _a, *a = &_a;
312 app_check_thread_and_barrier (app_mq_detach_handler, mp);
314 app = application_lookup (mp->client_index);
318 a->app_index = app->app_index;
319 a->api_client_index = mp->client_index;
320 vnet_application_detach (a);
324 session_mq_unlisten_handler (void *data)
326 session_unlisten_msg_t *mp = (session_unlisten_msg_t *) data;
327 vnet_unlisten_args_t _a, *a = &_a;
328 app_worker_t *app_wrk;
332 app_check_thread_and_barrier (session_mq_unlisten_handler, mp);
334 app = application_lookup (mp->client_index);
338 clib_memset (a, 0, sizeof (*a));
339 a->app_index = app->app_index;
340 a->handle = mp->handle;
341 a->wrk_map_index = mp->wrk_index;
342 if ((rv = vnet_unlisten (a)))
343 clib_warning ("unlisten returned: %d", rv);
345 app_wrk = application_get_worker (app, a->wrk_map_index);
349 mq_send_unlisten_reply (app_wrk, mp->handle, mp->context, rv);
353 session_mq_accepted_reply_handler (void *data)
355 session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
356 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
357 session_state_t old_state;
358 app_worker_t *app_wrk;
361 /* Server isn't interested, kill the session */
364 a->app_index = mp->context;
365 a->handle = mp->handle;
366 vnet_disconnect_session (a);
370 /* Mail this back from the main thread. We're not polling in main
371 * thread so we're using other workers for notifications. */
372 if (vlib_num_workers () && vlib_get_thread_index () != 0
373 && session_thread_from_handle (mp->handle) == 0)
375 vlib_rpc_call_main_thread (session_mq_accepted_reply_handler,
376 (u8 *) mp, sizeof (*mp));
380 s = session_get_from_handle_if_valid (mp->handle);
384 app_wrk = app_worker_get (s->app_wrk_index);
385 if (app_wrk->app_index != mp->context)
387 clib_warning ("app doesn't own session");
391 if (!session_has_transport (s))
393 s->session_state = SESSION_STATE_READY;
394 if (ct_session_connect_notify (s))
399 old_state = s->session_state;
400 s->session_state = SESSION_STATE_READY;
402 if (!svm_fifo_is_empty_prod (s->rx_fifo))
403 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
405 /* Closed while waiting for app to reply. Resend disconnect */
406 if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
408 app_worker_close_notify (app_wrk, s);
409 s->session_state = old_state;
416 session_mq_reset_reply_handler (void *data)
418 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
419 session_reset_reply_msg_t *mp;
420 app_worker_t *app_wrk;
423 u32 index, thread_index;
425 mp = (session_reset_reply_msg_t *) data;
426 app = application_lookup (mp->context);
430 session_parse_handle (mp->handle, &index, &thread_index);
431 s = session_get_if_valid (index, thread_index);
433 /* No session or not the right session */
434 if (!s || s->session_state < SESSION_STATE_TRANSPORT_CLOSING)
437 app_wrk = app_worker_get (s->app_wrk_index);
438 if (!app_wrk || app_wrk->app_index != app->app_index)
440 clib_warning ("App %u does not own handle 0x%lx!", app->app_index,
445 /* Client objected to resetting the session, log and continue */
448 clib_warning ("client retval %d", mp->retval);
452 /* This comes as a response to a reset, transport only waiting for
453 * confirmation to remove connection state, no need to disconnect */
454 a->handle = mp->handle;
455 a->app_index = app->app_index;
456 vnet_disconnect_session (a);
460 session_mq_disconnected_handler (void *data)
462 session_disconnected_reply_msg_t *rmp;
463 vnet_disconnect_args_t _a, *a = &_a;
464 svm_msg_q_msg_t _msg, *msg = &_msg;
465 session_disconnected_msg_t *mp;
466 app_worker_t *app_wrk;
467 session_event_t *evt;
472 mp = (session_disconnected_msg_t *) data;
473 if (!(s = session_get_from_handle_if_valid (mp->handle)))
475 clib_warning ("could not disconnect handle %llu", mp->handle);
478 app_wrk = app_worker_get (s->app_wrk_index);
479 app = application_lookup (mp->client_index);
480 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
482 clib_warning ("could not disconnect session: %llu app: %u",
483 mp->handle, mp->client_index);
487 a->handle = mp->handle;
488 a->app_index = app_wrk->wrk_index;
489 rv = vnet_disconnect_session (a);
491 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
492 SESSION_MQ_CTRL_EVT_RING,
494 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
495 clib_memset (evt, 0, sizeof (*evt));
496 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
497 rmp = (session_disconnected_reply_msg_t *) evt->data;
498 rmp->handle = mp->handle;
499 rmp->context = mp->context;
501 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
505 session_mq_disconnected_reply_handler (void *data)
507 session_disconnected_reply_msg_t *mp;
508 vnet_disconnect_args_t _a, *a = &_a;
511 mp = (session_disconnected_reply_msg_t *) data;
513 /* Client objected to disconnecting the session, log and continue */
516 clib_warning ("client retval %d", mp->retval);
520 /* Disconnect has been confirmed. Confirm close to transport */
521 app = application_lookup (mp->context);
524 a->handle = mp->handle;
525 a->app_index = app->app_index;
526 vnet_disconnect_session (a);
531 session_mq_worker_update_handler (void *data)
533 session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
534 session_worker_update_reply_msg_t *rmp;
535 svm_msg_q_msg_t _msg, *msg = &_msg;
536 app_worker_t *app_wrk;
537 u32 owner_app_wrk_map;
538 session_event_t *evt;
542 app = application_lookup (mp->client_index);
545 if (!(s = session_get_from_handle_if_valid (mp->handle)))
547 clib_warning ("invalid handle %llu", mp->handle);
550 app_wrk = app_worker_get (s->app_wrk_index);
551 if (app_wrk->app_index != app->app_index)
553 clib_warning ("app %u does not own session %llu", app->app_index,
557 owner_app_wrk_map = app_wrk->wrk_map_index;
558 app_wrk = application_get_worker (app, mp->wrk_index);
560 /* This needs to come from the new owner */
561 if (mp->req_wrk_index == owner_app_wrk_map)
563 session_req_worker_update_msg_t *wump;
565 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
566 SESSION_MQ_CTRL_EVT_RING,
568 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
569 clib_memset (evt, 0, sizeof (*evt));
570 evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
571 wump = (session_req_worker_update_msg_t *) evt->data;
572 wump->session_handle = mp->handle;
573 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
577 app_worker_own_session (app_wrk, s);
582 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
583 SESSION_MQ_CTRL_EVT_RING,
585 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
586 clib_memset (evt, 0, sizeof (*evt));
587 evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
588 rmp = (session_worker_update_reply_msg_t *) evt->data;
589 rmp->handle = mp->handle;
591 rmp->rx_fifo = fifo_segment_fifo_offset (s->rx_fifo);
593 rmp->tx_fifo = fifo_segment_fifo_offset (s->tx_fifo);
594 rmp->segment_handle = session_segment_handle (s);
595 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
598 * Retransmit messages that may have been lost
600 if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
601 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
603 if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
604 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
606 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
607 app_worker_close_notify (app_wrk, s);
611 session_mq_app_wrk_rpc_handler (void *data)
613 session_app_wrk_rpc_msg_t *mp = (session_app_wrk_rpc_msg_t *) data;
614 svm_msg_q_msg_t _msg, *msg = &_msg;
615 session_app_wrk_rpc_msg_t *rmp;
616 app_worker_t *app_wrk;
617 session_event_t *evt;
620 app = application_lookup (mp->client_index);
624 app_wrk = application_get_worker (app, mp->wrk_index);
626 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
627 SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT,
629 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
630 clib_memset (evt, 0, sizeof (*evt));
631 evt->event_type = SESSION_CTRL_EVT_APP_WRK_RPC;
632 rmp = (session_app_wrk_rpc_msg_t *) evt->data;
633 clib_memcpy (rmp->data, mp->data, sizeof (mp->data));
634 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
638 session_mq_transport_attr_handler (void *data)
640 session_transport_attr_msg_t *mp = (session_transport_attr_msg_t *) data;
641 session_transport_attr_reply_msg_t *rmp;
642 svm_msg_q_msg_t _msg, *msg = &_msg;
643 app_worker_t *app_wrk;
644 session_event_t *evt;
649 app = application_lookup (mp->client_index);
653 if (!(s = session_get_from_handle_if_valid (mp->handle)))
655 clib_warning ("invalid handle %llu", mp->handle);
658 app_wrk = app_worker_get (s->app_wrk_index);
659 if (app_wrk->app_index != app->app_index)
661 clib_warning ("app %u does not own session %llu", app->app_index,
666 rv = session_transport_attribute (s, mp->is_get, &mp->attr);
668 svm_msg_q_lock_and_alloc_msg_w_ring (
669 app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg);
670 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
671 clib_memset (evt, 0, sizeof (*evt));
672 evt->event_type = SESSION_CTRL_EVT_TRANSPORT_ATTR_REPLY;
673 rmp = (session_transport_attr_reply_msg_t *) evt->data;
674 rmp->handle = mp->handle;
676 rmp->is_get = mp->is_get;
677 if (!rv && mp->is_get)
678 rmp->attr = mp->attr;
679 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
682 vlib_node_registration_t session_queue_node;
687 u32 server_thread_index;
688 } session_queue_trace_t;
690 /* packet trace format function */
692 format_session_queue_trace (u8 * s, va_list * args)
694 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
695 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
696 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
698 s = format (s, "session index %d thread index %d",
699 t->session_index, t->server_thread_index);
703 #define foreach_session_queue_error \
704 _(TX, "Packets transmitted") \
705 _(TIMER, "Timer events") \
706 _(NO_BUFFER, "Out of buffers")
710 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
711 foreach_session_queue_error
713 SESSION_QUEUE_N_ERROR,
714 } session_queue_error_t;
716 static char *session_queue_error_strings[] = {
717 #define _(sym,string) string,
718 foreach_session_queue_error
724 SESSION_TX_NO_BUFFERS = -2,
730 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
731 u32 next_index, u32 * to_next, u16 n_segs,
732 session_t * s, u32 n_trace)
734 while (n_trace && n_segs)
736 vlib_buffer_t *b = vlib_get_buffer (vm, to_next[0]);
739 (vm, node, next_index, b, 1 /* follow_chain */ )))
741 session_queue_trace_t *t =
742 vlib_add_trace (vm, node, b, sizeof (*t));
743 t->session_index = s->session_index;
744 t->server_thread_index = s->thread_index;
750 vlib_set_trace_count (vm, node, n_trace);
754 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
755 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
757 vlib_buffer_t *chain_b, *prev_b;
758 u32 chain_bi0, to_deq, left_from_seg;
759 session_worker_t *wrk;
760 u16 len_to_deq, n_bytes_read;
763 wrk = session_main_get_worker (ctx->s->thread_index);
764 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
765 b->total_length_not_including_first_buffer = 0;
768 left_from_seg = clib_min (ctx->sp.snd_mss - b->current_length,
770 to_deq = left_from_seg;
771 for (j = 1; j < ctx->n_bufs_per_seg; j++)
774 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
777 chain_bi0 = wrk->tx_buffers[*n_bufs];
778 chain_b = vlib_get_buffer (vm, chain_bi0);
779 chain_b->current_data = 0;
780 data = vlib_buffer_get_current (chain_b);
783 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo,
784 ctx->sp.tx_offset, len_to_deq, data);
785 ctx->sp.tx_offset += n_bytes_read;
789 if (ctx->transport_vft->transport_options.tx_type ==
792 svm_fifo_t *f = ctx->s->tx_fifo;
793 session_dgram_hdr_t *hdr = &ctx->hdr;
797 deq_now = clib_min (hdr->data_length - hdr->data_offset,
799 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
800 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data);
801 ASSERT (n_bytes_read > 0);
803 hdr->data_offset += n_bytes_read;
804 if (hdr->data_offset == hdr->data_length)
806 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
807 svm_fifo_dequeue_drop (f, offset);
808 if (ctx->left_to_snd > n_bytes_read)
809 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
812 else if (ctx->left_to_snd == n_bytes_read)
813 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
814 sizeof (session_dgram_pre_hdr_t));
817 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
820 ASSERT (n_bytes_read == len_to_deq);
821 chain_b->current_length = n_bytes_read;
822 b->total_length_not_including_first_buffer += chain_b->current_length;
824 /* update previous buffer */
825 prev_b->next_buffer = chain_bi0;
826 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
828 /* update current buffer */
829 chain_b->next_buffer = 0;
831 to_deq -= n_bytes_read;
836 && b->total_length_not_including_first_buffer == left_from_seg);
837 ctx->left_to_snd -= left_from_seg;
841 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
842 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
849 * Start with the first buffer in chain
852 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
855 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
856 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
860 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset,
862 ASSERT (n_bytes_read > 0);
863 /* Keep track of progress locally, transport is also supposed to
864 * increment it independently when pushing the header */
865 ctx->sp.tx_offset += n_bytes_read;
869 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
871 session_dgram_hdr_t *hdr = &ctx->hdr;
872 svm_fifo_t *f = ctx->s->tx_fifo;
876 ASSERT (hdr->data_length > hdr->data_offset);
877 deq_now = clib_min (hdr->data_length - hdr->data_offset,
879 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
880 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
881 ASSERT (n_bytes_read > 0);
883 if (ctx->s->session_state == SESSION_STATE_LISTENING)
885 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
886 ctx->tc->rmt_port = hdr->rmt_port;
888 hdr->data_offset += n_bytes_read;
889 if (hdr->data_offset == hdr->data_length)
891 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
892 svm_fifo_dequeue_drop (f, offset);
893 if (ctx->left_to_snd > n_bytes_read)
894 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
897 else if (ctx->left_to_snd == n_bytes_read)
898 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
899 sizeof (session_dgram_pre_hdr_t));
903 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
905 ASSERT (n_bytes_read > 0);
908 b->current_length = n_bytes_read;
909 ctx->left_to_snd -= n_bytes_read;
912 * Fill in the remaining buffers in the chain, if any
914 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
915 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
919 session_tx_not_ready (session_t * s, u8 peek_data)
923 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
925 /* Can retransmit for closed sessions but can't send new data if
926 * session is not ready or closed */
927 else if (s->session_state < SESSION_STATE_READY)
929 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
931 /* Allow closed transports to still send custom packets.
932 * For instance, tcp may want to send acks in time-wait. */
933 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
934 && (s->flags & SESSION_F_CUSTOM_TX))
942 always_inline transport_connection_t *
943 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
947 return ctx->transport_vft->get_connection (ctx->s->connection_index,
948 ctx->s->thread_index);
952 if (ctx->s->session_state == SESSION_STATE_LISTENING)
953 return ctx->transport_vft->get_listener (ctx->s->connection_index);
956 return ctx->transport_vft->get_connection (ctx->s->connection_index,
957 ctx->s->thread_index);
963 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
964 u32 max_segs, u8 peek_data)
966 u32 n_bytes_per_buf, n_bytes_per_seg;
968 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
969 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
973 /* Offset in rx fifo from where to peek data */
974 if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue))
976 ctx->max_len_to_snd = 0;
979 ctx->max_dequeue -= ctx->sp.tx_offset;
983 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
985 u32 len, chain_limit;
987 if (ctx->max_dequeue <= sizeof (ctx->hdr))
989 ctx->max_len_to_snd = 0;
993 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
995 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
996 len = ctx->hdr.data_length - ctx->hdr.data_offset;
998 /* Process multiple dgrams if smaller than min (buf_space, mss).
999 * This avoids handling multiple dgrams if they require buffer
1001 chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN,
1003 if (ctx->hdr.data_length <= chain_limit)
1005 u32 first_dgram_len, dgram_len, offset, max_offset;
1006 session_dgram_hdr_t hdr;
1008 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len);
1009 offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t);
1010 first_dgram_len = len;
1011 max_offset = clib_min (ctx->max_dequeue, 16 << 10);
1013 while (offset < max_offset)
1015 svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
1017 ASSERT (hdr.data_length > hdr.data_offset);
1018 dgram_len = hdr.data_length - hdr.data_offset;
1019 if (len + dgram_len > ctx->max_dequeue
1020 || first_dgram_len != dgram_len)
1023 offset += sizeof (hdr) + hdr.data_length;
1027 ctx->max_dequeue = len;
1030 ASSERT (ctx->max_dequeue > 0);
1032 /* Ensure we're not writing more than transport window allows */
1033 if (ctx->max_dequeue < ctx->sp.snd_space)
1035 /* Constrained by tx queue. Try to send only fully formed segments */
1036 ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ?
1037 (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) :
1043 /* Expectation is that snd_space0 is already a multiple of snd_mss */
1044 ctx->max_len_to_snd = ctx->sp.snd_space;
1047 /* Check if we're tx constrained by the node */
1048 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss);
1049 if (ctx->n_segs_per_evt > max_segs)
1051 ctx->n_segs_per_evt = max_segs;
1052 ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss;
1055 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
1056 if (ctx->n_segs_per_evt > 1)
1058 u32 n_bytes_last_seg, n_bufs_last_seg;
1060 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss;
1061 n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd
1062 - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss);
1063 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
1064 n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf);
1065 ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg)
1070 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd;
1071 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
1072 ctx->n_bufs_needed = ctx->n_bufs_per_seg;
1075 ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf);
1076 ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss,
1078 TRANSPORT_MAX_HDRS_LEN);
1082 session_tx_maybe_reschedule (session_worker_t * wrk,
1083 session_tx_context_t * ctx,
1084 session_evt_elt_t * elt)
1086 session_t *s = ctx->s;
1088 svm_fifo_unset_event (s->tx_fifo);
1089 if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset)
1090 if (svm_fifo_set_event (s->tx_fifo))
1091 session_evt_add_head_old (wrk, elt);
1095 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
1096 vlib_node_runtime_t * node,
1097 session_evt_elt_t * elt,
1098 int *n_tx_packets, u8 peek_data)
1100 u32 n_trace, n_left, pbi, next_index, max_burst;
1101 session_tx_context_t *ctx = &wrk->ctx;
1102 session_main_t *smm = &session_main;
1103 session_event_t *e = &elt->evt;
1104 vlib_main_t *vm = wrk->vm;
1105 transport_proto_t tp;
1109 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
1112 session_evt_add_old (wrk, elt);
1113 return SESSION_TX_NO_DATA;
1116 next_index = smm->session_type_to_next[ctx->s->session_type];
1117 max_burst = SESSION_NODE_FRAME_SIZE - *n_tx_packets;
1119 tp = session_get_transport_proto (ctx->s);
1120 ctx->transport_vft = transport_protocol_get_vft (tp);
1121 ctx->tc = session_tx_get_transport (ctx, peek_data);
1123 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
1125 if (ctx->transport_vft->flush_data)
1126 ctx->transport_vft->flush_data (ctx->tc);
1127 e->event_type = SESSION_IO_EVT_TX;
1130 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
1133 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
1134 ctx->sp.max_burst_size = max_burst;
1135 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp);
1136 *n_tx_packets += n_custom_tx;
1138 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1139 return SESSION_TX_OK;
1140 max_burst -= n_custom_tx;
1141 if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX))
1143 session_evt_add_old (wrk, elt);
1144 return SESSION_TX_OK;
1148 transport_connection_snd_params (ctx->tc, &ctx->sp);
1150 if (!ctx->sp.snd_space)
1152 /* If the deschedule flag was set, remove session from scheduler.
1153 * Transport is responsible for rescheduling this session. */
1154 if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED)
1155 transport_connection_deschedule (ctx->tc);
1156 /* Request to postpone the session, e.g., zero-wnd and transport
1157 * is not currently probing */
1158 else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE)
1159 session_evt_add_old (wrk, elt);
1160 /* This flow queue is "empty" so it should be re-evaluated before
1161 * the ones that have data to send. */
1163 session_evt_add_head_old (wrk, elt);
1165 return SESSION_TX_NO_DATA;
1168 if (transport_connection_is_tx_paced (ctx->tc))
1170 u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc);
1171 if (snd_space < TRANSPORT_PACER_MIN_BURST)
1173 session_evt_add_head_old (wrk, elt);
1174 return SESSION_TX_NO_DATA;
1176 snd_space = clib_min (ctx->sp.snd_space, snd_space);
1177 ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ?
1178 snd_space - snd_space % ctx->sp.snd_mss : snd_space;
1181 /* Check how much we can pull. */
1182 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
1184 if (PREDICT_FALSE (!ctx->max_len_to_snd))
1186 transport_connection_tx_pacer_reset_bucket (ctx->tc, 0);
1187 session_tx_maybe_reschedule (wrk, ctx, elt);
1188 return SESSION_TX_NO_DATA;
1191 vec_validate_aligned (wrk->tx_buffers, ctx->n_bufs_needed - 1,
1192 CLIB_CACHE_LINE_BYTES);
1193 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, ctx->n_bufs_needed);
1194 if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed))
1197 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1198 session_evt_add_head_old (wrk, elt);
1199 vlib_node_increment_counter (wrk->vm, node->node_index,
1200 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
1201 return SESSION_TX_NO_BUFFERS;
1204 if (transport_connection_is_tx_paced (ctx->tc))
1205 transport_connection_tx_pacer_update_bytes (ctx->tc, ctx->max_len_to_snd);
1207 ctx->left_to_snd = ctx->max_len_to_snd;
1208 n_left = ctx->n_segs_per_evt;
1212 vlib_buffer_t *b0, *b1;
1215 pbi = wrk->tx_buffers[n_bufs - 3];
1216 pb = vlib_get_buffer (vm, pbi);
1217 vlib_prefetch_buffer_header (pb, STORE);
1218 pbi = wrk->tx_buffers[n_bufs - 4];
1219 pb = vlib_get_buffer (vm, pbi);
1220 vlib_prefetch_buffer_header (pb, STORE);
1222 bi0 = wrk->tx_buffers[--n_bufs];
1223 bi1 = wrk->tx_buffers[--n_bufs];
1225 b0 = vlib_get_buffer (vm, bi0);
1226 b1 = vlib_get_buffer (vm, bi1);
1228 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1229 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
1231 ctx->transport_vft->push_header (ctx->tc, b0);
1232 ctx->transport_vft->push_header (ctx->tc, b1);
1236 vec_add1 (wrk->pending_tx_buffers, bi0);
1237 vec_add1 (wrk->pending_tx_buffers, bi1);
1238 vec_add1 (wrk->pending_tx_nexts, next_index);
1239 vec_add1 (wrk->pending_tx_nexts, next_index);
1248 pbi = wrk->tx_buffers[n_bufs - 2];
1249 pb = vlib_get_buffer (vm, pbi);
1250 vlib_prefetch_buffer_header (pb, STORE);
1253 bi0 = wrk->tx_buffers[--n_bufs];
1254 b0 = vlib_get_buffer (vm, bi0);
1255 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1257 /* Ask transport to push header after current_length and
1258 * total_length_not_including_first_buffer are updated */
1259 ctx->transport_vft->push_header (ctx->tc, b0);
1263 vec_add1 (wrk->pending_tx_buffers, bi0);
1264 vec_add1 (wrk->pending_tx_nexts, next_index);
1267 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
1268 session_tx_trace_frame (vm, node, next_index, wrk->pending_tx_buffers,
1269 ctx->n_segs_per_evt, ctx->s, n_trace);
1271 if (PREDICT_FALSE (n_bufs))
1272 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1274 *n_tx_packets += ctx->n_segs_per_evt;
1276 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
1277 ctx->s->tx_fifo->has_event, wrk->last_vlib_time);
1279 ASSERT (ctx->left_to_snd == 0);
1281 /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise,
1282 * check if application enqueued more data and reschedule accordingly */
1283 if (ctx->max_len_to_snd < ctx->max_dequeue)
1284 session_evt_add_old (wrk, elt);
1286 session_tx_maybe_reschedule (wrk, ctx, elt);
1290 u32 n_dequeued = ctx->max_len_to_snd;
1291 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1292 n_dequeued += ctx->n_segs_per_evt * SESSION_CONN_HDR_LEN;
1293 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, n_dequeued))
1294 session_dequeue_notify (ctx->s);
1296 return SESSION_TX_OK;
1300 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1301 vlib_node_runtime_t * node,
1302 session_evt_elt_t * e, int *n_tx_packets)
1304 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1308 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1309 vlib_node_runtime_t * node,
1310 session_evt_elt_t * e, int *n_tx_packets)
1312 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1316 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1317 vlib_node_runtime_t * node,
1318 session_evt_elt_t * elt, int *n_tx_packets)
1320 transport_send_params_t *sp = &wrk->ctx.sp;
1321 session_t *s = wrk->ctx.s;
1324 if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1327 /* Clear custom-tx flag used to request reschedule for tx */
1328 s->flags &= ~SESSION_F_CUSTOM_TX;
1330 sp->max_burst_size = clib_min (SESSION_NODE_FRAME_SIZE - *n_tx_packets,
1331 TRANSPORT_PACER_MAX_BURST_PKTS);
1333 n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp);
1334 *n_tx_packets += n_packets;
1336 if (s->flags & SESSION_F_CUSTOM_TX)
1338 session_evt_add_old (wrk, elt);
1340 else if (!(sp->flags & TRANSPORT_SND_F_DESCHED))
1342 svm_fifo_unset_event (s->tx_fifo);
1343 if (svm_fifo_max_dequeue_cons (s->tx_fifo))
1344 if (svm_fifo_set_event (s->tx_fifo))
1345 session_evt_add_head_old (wrk, elt);
1348 if (sp->max_burst_size &&
1349 svm_fifo_needs_deq_ntf (s->tx_fifo, sp->max_burst_size))
1350 session_dequeue_notify (s);
1355 always_inline session_t *
1356 session_event_get_session (session_worker_t * wrk, session_event_t * e)
1358 if (PREDICT_FALSE (pool_is_free_index (wrk->sessions, e->session_index)))
1361 ASSERT (session_is_valid (e->session_index, wrk->vm->thread_index));
1362 return pool_elt_at_index (wrk->sessions, e->session_index);
1366 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1368 clib_llist_index_t ei;
1369 void (*fp) (void *);
1373 ei = clib_llist_entry_index (wrk->event_elts, elt);
1376 switch (e->event_type)
1378 case SESSION_CTRL_EVT_RPC:
1379 fp = e->rpc_args.fp;
1380 (*fp) (e->rpc_args.arg);
1382 case SESSION_CTRL_EVT_HALF_CLOSE:
1383 s = session_get_from_handle_if_valid (e->session_handle);
1384 if (PREDICT_FALSE (!s))
1386 session_transport_half_close (s);
1388 case SESSION_CTRL_EVT_CLOSE:
1389 s = session_get_from_handle_if_valid (e->session_handle);
1390 if (PREDICT_FALSE (!s))
1392 session_transport_close (s);
1394 case SESSION_CTRL_EVT_RESET:
1395 s = session_get_from_handle_if_valid (e->session_handle);
1396 if (PREDICT_FALSE (!s))
1398 session_transport_reset (s);
1400 case SESSION_CTRL_EVT_LISTEN:
1401 session_mq_listen_handler (session_evt_ctrl_data (wrk, elt));
1403 case SESSION_CTRL_EVT_LISTEN_URI:
1404 session_mq_listen_uri_handler (session_evt_ctrl_data (wrk, elt));
1406 case SESSION_CTRL_EVT_UNLISTEN:
1407 session_mq_unlisten_handler (session_evt_ctrl_data (wrk, elt));
1409 case SESSION_CTRL_EVT_CONNECT:
1410 session_mq_connect_handler (wrk, elt);
1412 case SESSION_CTRL_EVT_CONNECT_URI:
1413 session_mq_connect_uri_handler (session_evt_ctrl_data (wrk, elt));
1415 case SESSION_CTRL_EVT_SHUTDOWN:
1416 session_mq_shutdown_handler (session_evt_ctrl_data (wrk, elt));
1418 case SESSION_CTRL_EVT_DISCONNECT:
1419 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1421 case SESSION_CTRL_EVT_DISCONNECTED:
1422 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1424 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1425 session_mq_accepted_reply_handler (session_evt_ctrl_data (wrk, elt));
1427 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1428 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1431 case SESSION_CTRL_EVT_RESET_REPLY:
1432 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1434 case SESSION_CTRL_EVT_WORKER_UPDATE:
1435 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1437 case SESSION_CTRL_EVT_APP_DETACH:
1438 app_mq_detach_handler (session_evt_ctrl_data (wrk, elt));
1440 case SESSION_CTRL_EVT_APP_WRK_RPC:
1441 session_mq_app_wrk_rpc_handler (session_evt_ctrl_data (wrk, elt));
1443 case SESSION_CTRL_EVT_TRANSPORT_ATTR:
1444 session_mq_transport_attr_handler (session_evt_ctrl_data (wrk, elt));
1447 clib_warning ("unhandled event type %d", e->event_type);
1450 /* Regrab elements in case pool moved */
1451 elt = pool_elt_at_index (wrk->event_elts, ei);
1452 if (!clib_llist_elt_is_linked (elt, evt_list))
1455 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1456 session_evt_ctrl_data_free (wrk, elt);
1457 session_evt_elt_free (wrk, elt);
1459 SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk);
1463 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1464 session_evt_elt_t * elt, int *n_tx_packets)
1466 session_main_t *smm = &session_main;
1467 app_worker_t *app_wrk;
1468 clib_llist_index_t ei;
1472 ei = clib_llist_entry_index (wrk->event_elts, elt);
1475 switch (e->event_type)
1477 case SESSION_IO_EVT_TX_FLUSH:
1478 case SESSION_IO_EVT_TX:
1479 s = session_event_get_session (wrk, e);
1480 if (PREDICT_FALSE (!s))
1482 CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1484 /* Spray packets in per session type frames, since they go to
1485 * different nodes */
1486 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1488 case SESSION_IO_EVT_RX:
1489 s = session_event_get_session (wrk, e);
1492 transport_app_rx_evt (session_get_transport_proto (s),
1493 s->connection_index, s->thread_index);
1495 case SESSION_IO_EVT_BUILTIN_RX:
1496 s = session_event_get_session (wrk, e);
1497 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1499 svm_fifo_unset_event (s->rx_fifo);
1500 app_wrk = app_worker_get (s->app_wrk_index);
1501 app_worker_builtin_rx (app_wrk, s);
1503 case SESSION_IO_EVT_BUILTIN_TX:
1504 s = session_get_from_handle_if_valid (e->session_handle);
1506 if (PREDICT_TRUE (s != 0))
1507 session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets);
1510 clib_warning ("unhandled event type %d", e->event_type);
1513 SESSION_EVT (SESSION_IO_EVT_COUNTS, e->event_type, 1, wrk);
1515 /* Regrab elements in case pool moved */
1516 elt = pool_elt_at_index (wrk->event_elts, ei);
1517 if (!clib_llist_elt_is_linked (elt, evt_list))
1518 session_evt_elt_free (wrk, elt);
1522 static const u32 session_evt_msg_sizes[] = {
1523 #define _(symc, sym) \
1524 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1525 foreach_session_ctrl_evt
1531 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1533 session_evt_elt_t *elt;
1535 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1537 elt = session_evt_alloc_ctrl (wrk);
1538 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1540 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1541 elt->evt.event_type = evt->event_type;
1542 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1543 session_evt_msg_sizes[evt->event_type]);
1547 /* Internal control events fit into io events footprint */
1548 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1553 elt = session_evt_alloc_new (wrk);
1554 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1559 session_flush_pending_tx_buffers (session_worker_t * wrk,
1560 vlib_node_runtime_t * node)
1562 vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
1563 wrk->pending_tx_nexts,
1564 vec_len (wrk->pending_tx_nexts));
1565 vec_reset_length (wrk->pending_tx_buffers);
1566 vec_reset_length (wrk->pending_tx_nexts);
1570 session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq)
1572 svm_msg_q_msg_t _msg, *msg = &_msg;
1573 u32 i, n_to_dequeue = 0;
1574 session_event_t *evt;
1576 n_to_dequeue = svm_msg_q_size (mq);
1577 for (i = 0; i < n_to_dequeue; i++)
1579 svm_msg_q_sub_raw (mq, msg);
1580 evt = svm_msg_q_msg_data (mq, msg);
1581 session_evt_add_to_list (wrk, evt);
1582 svm_msg_q_free_msg (mq, msg);
1585 return n_to_dequeue;
1589 session_wrk_timerfd_update (session_worker_t *wrk, u64 time_ns)
1591 struct itimerspec its;
1593 its.it_value.tv_sec = 0;
1594 its.it_value.tv_nsec = time_ns;
1595 its.it_interval.tv_sec = 0;
1596 its.it_interval.tv_nsec = its.it_value.tv_nsec;
1598 if (timerfd_settime (wrk->timerfd, 0, &its, NULL) == -1)
1599 clib_warning ("timerfd_settime");
1603 session_wrk_tfd_timeout (session_wrk_state_t state, u32 thread_index)
1605 if (state == SESSION_WRK_INTERRUPT)
1606 return thread_index ? 1e6 : vlib_num_workers () ? 5e8 : 1e6;
1607 else if (state == SESSION_WRK_IDLE)
1608 return thread_index ? 1e8 : vlib_num_workers () ? 5e8 : 1e8;
1614 session_wrk_set_state (session_worker_t *wrk, session_wrk_state_t state)
1619 time_ns = session_wrk_tfd_timeout (state, wrk->vm->thread_index);
1620 session_wrk_timerfd_update (wrk, time_ns);
1624 session_wrk_update_state (session_worker_t *wrk)
1626 vlib_main_t *vm = wrk->vm;
1628 if (wrk->state == SESSION_WRK_POLLING)
1630 if (pool_elts (wrk->event_elts) == 3 &&
1631 vlib_last_vectors_per_main_loop (vm) < 1)
1633 session_wrk_set_state (wrk, SESSION_WRK_INTERRUPT);
1634 vlib_node_set_state (vm, session_queue_node.index,
1635 VLIB_NODE_STATE_INTERRUPT);
1638 else if (wrk->state == SESSION_WRK_INTERRUPT)
1640 if (pool_elts (wrk->event_elts) > 3 ||
1641 vlib_last_vectors_per_main_loop (vm) > 1)
1643 session_wrk_set_state (wrk, SESSION_WRK_POLLING);
1644 vlib_node_set_state (vm, session_queue_node.index,
1645 VLIB_NODE_STATE_POLLING);
1647 else if (PREDICT_FALSE (!pool_elts (wrk->sessions)))
1649 session_wrk_set_state (wrk, SESSION_WRK_IDLE);
1654 if (pool_elts (wrk->event_elts))
1656 session_wrk_set_state (wrk, SESSION_WRK_INTERRUPT);
1662 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1663 vlib_frame_t * frame)
1665 u32 thread_index = vm->thread_index, __clib_unused n_evts;
1666 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1667 session_main_t *smm = vnet_get_session_main ();
1668 session_worker_t *wrk = &smm->wrk[thread_index];
1669 clib_llist_index_t ei, next_ei, old_ti;
1672 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1674 session_wrk_update_time (wrk, vlib_time_now (vm));
1677 * Update transport time
1679 transport_update_time (wrk->last_vlib_time, thread_index);
1680 n_tx_packets = vec_len (wrk->pending_tx_buffers);
1681 SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk);
1684 * Dequeue new internal mq events
1687 n_evts = session_wrk_handle_mq (wrk, wrk->vpp_event_queue);
1688 SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_evts);
1691 * Handle control events
1694 ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head);
1696 clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({
1697 clib_llist_remove (wrk->event_elts, evt_list, elt);
1698 session_event_dispatch_ctrl (wrk, elt);
1701 SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk);
1704 * Handle the new io events.
1707 new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head);
1708 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1709 old_ti = clib_llist_prev_index (old_he, evt_list);
1711 ei = clib_llist_next_index (new_he, evt_list);
1712 while (ei != wrk->new_head && n_tx_packets < SESSION_NODE_FRAME_SIZE)
1714 elt = pool_elt_at_index (wrk->event_elts, ei);
1715 ei = clib_llist_next_index (elt, evt_list);
1716 clib_llist_remove (wrk->event_elts, evt_list, elt);
1717 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1720 SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk);
1723 * Handle the old io events, if we had any prior to processing the new ones
1726 if (old_ti != wrk->old_head)
1728 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1729 ei = clib_llist_next_index (old_he, evt_list);
1731 while (n_tx_packets < SESSION_NODE_FRAME_SIZE)
1733 elt = pool_elt_at_index (wrk->event_elts, ei);
1734 next_ei = clib_llist_next_index (elt, evt_list);
1735 clib_llist_remove (wrk->event_elts, evt_list, elt);
1737 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1746 SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk);
1748 if (vec_len (wrk->pending_tx_buffers))
1749 session_flush_pending_tx_buffers (wrk, node);
1751 vlib_node_increment_counter (vm, session_queue_node.index,
1752 SESSION_QUEUE_ERROR_TX, n_tx_packets);
1754 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
1756 if (wrk->flags & SESSION_WRK_F_ADAPTIVE)
1757 session_wrk_update_state (wrk);
1759 return n_tx_packets;
1763 VLIB_REGISTER_NODE (session_queue_node) =
1765 .function = session_queue_node_fn,
1766 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1767 .name = "session-queue",
1768 .format_trace = format_session_queue_trace,
1769 .type = VLIB_NODE_TYPE_INPUT,
1770 .n_errors = ARRAY_LEN (session_queue_error_strings),
1771 .error_strings = session_queue_error_strings,
1772 .state = VLIB_NODE_STATE_DISABLED,
1776 static clib_error_t *
1777 session_wrk_tfd_read_ready (clib_file_t *cf)
1779 session_worker_t *wrk = session_main_get_worker (cf->private_data);
1783 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
1784 rv = read (wrk->timerfd, &buf, sizeof (buf));
1785 if (rv < 0 && errno != EAGAIN)
1786 clib_unix_warning ("failed");
1790 static clib_error_t *
1791 session_wrk_tfd_write_ready (clib_file_t *cf)
1797 session_wrk_enable_adaptive_mode (session_worker_t *wrk)
1799 u32 thread_index = wrk->vm->thread_index;
1800 clib_file_t template = { 0 };
1802 if ((wrk->timerfd = timerfd_create (CLOCK_MONOTONIC, TFD_NONBLOCK)) < 0)
1803 clib_warning ("timerfd_create");
1805 template.read_function = session_wrk_tfd_read_ready;
1806 template.write_function = session_wrk_tfd_write_ready;
1807 template.file_descriptor = wrk->timerfd;
1808 template.private_data = thread_index;
1809 template.polling_thread_index = thread_index;
1810 template.description = format (0, "session-wrk-tfd-%u", thread_index);
1812 wrk->timerfd_file = clib_file_add (&file_main, &template);
1813 wrk->flags |= SESSION_WRK_F_ADAPTIVE;
1816 static clib_error_t *
1817 session_queue_exit (vlib_main_t * vm)
1819 if (vlib_get_n_threads () < 2)
1823 * Shut off (especially) worker-thread session nodes.
1824 * Otherwise, vpp can crash as the main thread unmaps the
1827 vlib_worker_thread_barrier_sync (vm);
1828 session_node_enable_disable (0 /* is_enable */ );
1829 vlib_worker_thread_barrier_release (vm);
1833 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1836 session_queue_run_on_main (vlib_main_t * vm)
1838 vlib_node_runtime_t *node;
1840 node = vlib_node_get_runtime (vm, session_queue_node.index);
1841 return session_queue_node_fn (vm, node, 0);
1845 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1848 uword *event_data = 0;
1854 vlib_process_wait_for_event_or_clock (vm, timeout);
1855 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1859 case SESSION_Q_PROCESS_RUN_ON_MAIN:
1860 /* Run session queue node on main thread */
1861 session_queue_run_on_main (vm);
1863 case SESSION_Q_PROCESS_STOP:
1864 vlib_node_set_state (vm, session_queue_process_node.index,
1865 VLIB_NODE_STATE_DISABLED);
1869 /* Timed out. Run on main to ensure all events are handled */
1870 session_queue_run_on_main (vm);
1873 vec_reset_length (event_data);
1879 VLIB_REGISTER_NODE (session_queue_process_node) =
1881 .function = session_queue_process,
1882 .type = VLIB_NODE_TYPE_PROCESS,
1883 .name = "session-queue-process",
1884 .state = VLIB_NODE_STATE_DISABLED,
1888 static_always_inline uword
1889 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1890 vlib_frame_t * frame)
1892 session_main_t *sm = &session_main;
1893 if (!sm->wrk[0].vpp_event_queue)
1895 node = vlib_node_get_runtime (vm, session_queue_node.index);
1896 return session_queue_node_fn (vm, node, frame);
1900 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
1902 .function = session_queue_pre_input_inline,
1903 .type = VLIB_NODE_TYPE_PRE_INPUT,
1904 .name = "session-queue-main",
1905 .state = VLIB_NODE_STATE_DISABLED,
1910 * fd.io coding-style-patch-verification: ON
1913 * eval: (c-set-style "gnu")