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>
30 session_wrk_send_evt_to_main (session_worker_t *wrk, session_evt_elt_t *elt)
32 session_evt_elt_t *he;
36 thread_index = wrk->vm->thread_index;
37 he = clib_llist_elt (wrk->event_elts, wrk->evts_pending_main);
38 is_empty = clib_llist_is_empty (wrk->event_elts, evt_list, he);
39 clib_llist_add_tail (wrk->event_elts, evt_list, elt, he);
41 session_send_rpc_evt_to_thread (0, session_wrk_handle_evts_main_rpc,
42 uword_to_pointer (thread_index, void *));
45 #define app_check_thread_and_barrier(_wrk, _elt) \
46 if (!vlib_thread_is_main_w_barrier ()) \
48 session_wrk_send_evt_to_main (wrk, elt); \
53 session_wrk_timerfd_update (session_worker_t *wrk, u64 time_ns)
55 struct itimerspec its;
57 its.it_value.tv_sec = 0;
58 its.it_value.tv_nsec = time_ns;
59 its.it_interval.tv_sec = 0;
60 its.it_interval.tv_nsec = its.it_value.tv_nsec;
62 if (timerfd_settime (wrk->timerfd, 0, &its, NULL) == -1)
63 clib_warning ("timerfd_settime");
67 session_wrk_tfd_timeout (session_wrk_state_t state, u32 thread_index)
69 if (state == SESSION_WRK_INTERRUPT)
70 return thread_index ? 1e6 : vlib_num_workers () ? 5e8 : 1e6;
71 else if (state == SESSION_WRK_IDLE)
72 return thread_index ? 1e8 : vlib_num_workers () ? 5e8 : 1e8;
78 session_wrk_set_state (session_worker_t *wrk, session_wrk_state_t state)
83 if (wrk->timerfd == -1)
85 time_ns = session_wrk_tfd_timeout (state, wrk->vm->thread_index);
86 session_wrk_timerfd_update (wrk, time_ns);
89 static transport_endpt_ext_cfg_t *
90 session_mq_get_ext_config (application_t *app, uword offset)
95 fs = application_get_rx_mqs_segment (app);
96 c = fs_chunk_ptr (fs->h, offset);
97 return (transport_endpt_ext_cfg_t *) c->data;
101 session_mq_free_ext_config (application_t *app, uword offset)
106 fs = application_get_rx_mqs_segment (app);
107 c = fs_chunk_ptr (fs->h, offset);
108 fifo_segment_collect_chunk (fs, 0 /* only one slice */, c);
112 session_mq_listen_handler (session_worker_t *wrk, session_evt_elt_t *elt)
114 vnet_listen_args_t _a, *a = &_a;
115 session_listen_msg_t *mp;
116 app_worker_t *app_wrk;
120 app_check_thread_and_barrier (wrk, elt);
122 mp = session_evt_ctrl_data (wrk, elt);
123 app = application_lookup (mp->client_index);
127 clib_memset (a, 0, sizeof (*a));
128 a->sep.is_ip4 = mp->is_ip4;
129 ip_copy (&a->sep.ip, &mp->ip, mp->is_ip4);
130 a->sep.port = mp->port;
131 a->sep.fib_index = mp->vrf;
132 a->sep.sw_if_index = ENDPOINT_INVALID_INDEX;
133 a->sep.transport_proto = mp->proto;
134 a->app_index = app->app_index;
135 a->wrk_map_index = mp->wrk_index;
136 a->sep_ext.transport_flags = mp->flags;
139 a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config);
141 if ((rv = vnet_listen (a)))
142 session_worker_stat_error_inc (wrk, rv, 1);
144 app_wrk = application_get_worker (app, mp->wrk_index);
145 app_worker_listened_notify (app_wrk, a->handle, mp->context, rv);
148 session_mq_free_ext_config (app, mp->ext_config);
150 /* Make sure events are flushed before releasing barrier, to avoid
151 * potential race with accept. */
152 app_wrk_flush_wrk_events (app_wrk, 0);
156 session_mq_listen_uri_handler (session_worker_t *wrk, session_evt_elt_t *elt)
158 vnet_listen_args_t _a, *a = &_a;
159 session_listen_uri_msg_t *mp;
160 app_worker_t *app_wrk;
164 app_check_thread_and_barrier (wrk, elt);
166 mp = session_evt_ctrl_data (wrk, elt);
167 app = application_lookup (mp->client_index);
171 clib_memset (a, 0, sizeof (*a));
172 a->uri = (char *) mp->uri;
173 a->app_index = app->app_index;
174 rv = vnet_bind_uri (a);
176 app_wrk = application_get_worker (app, 0);
177 app_worker_listened_notify (app_wrk, a->handle, mp->context, rv);
178 app_wrk_flush_wrk_events (app_wrk, 0);
182 session_mq_connect_one (session_connect_msg_t *mp)
184 vnet_connect_args_t _a, *a = &_a;
185 app_worker_t *app_wrk;
186 session_worker_t *wrk;
190 app = application_lookup (mp->client_index);
194 clib_memset (a, 0, sizeof (*a));
195 a->sep.is_ip4 = mp->is_ip4;
196 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
197 a->sep.port = mp->port;
198 a->sep.transport_proto = mp->proto;
199 a->sep.peer.fib_index = mp->vrf;
200 a->sep.dscp = mp->dscp;
201 clib_memcpy_fast (&a->sep.peer.ip, &mp->lcl_ip, sizeof (mp->lcl_ip));
204 ip46_address_mask_ip4 (&a->sep.ip);
205 ip46_address_mask_ip4 (&a->sep.peer.ip);
207 a->sep.peer.port = mp->lcl_port;
208 a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX;
209 a->sep_ext.parent_handle = mp->parent_handle;
210 a->sep_ext.transport_flags = mp->flags;
211 a->api_context = mp->context;
212 a->app_index = app->app_index;
213 a->wrk_map_index = mp->wrk_index;
216 a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config);
218 if ((rv = vnet_connect (a)))
220 wrk = session_main_get_worker (vlib_get_thread_index ());
221 session_worker_stat_error_inc (wrk, rv, 1);
222 app_wrk = application_get_worker (app, mp->wrk_index);
223 app_worker_connect_notify (app_wrk, 0, rv, mp->context);
227 session_mq_free_ext_config (app, mp->ext_config);
231 session_mq_handle_connects_rpc (void *arg)
233 u32 max_connects = 32, n_connects = 0;
234 session_evt_elt_t *he, *elt, *next;
235 session_worker_t *fwrk;
237 ASSERT (session_vlib_thread_is_cl_thread ());
239 /* Pending connects on linked list pertaining to first worker */
240 fwrk = session_main_get_worker (transport_cl_thread ());
241 if (!fwrk->n_pending_connects)
244 he = clib_llist_elt (fwrk->event_elts, fwrk->pending_connects);
245 elt = clib_llist_next (fwrk->event_elts, evt_list, he);
247 /* Avoid holding the worker for too long */
248 while (n_connects < max_connects && elt != he)
250 next = clib_llist_next (fwrk->event_elts, evt_list, elt);
251 clib_llist_remove (fwrk->event_elts, evt_list, elt);
252 session_mq_connect_one (session_evt_ctrl_data (fwrk, elt));
253 session_evt_ctrl_data_free (fwrk, elt);
254 clib_llist_put (fwrk->event_elts, elt);
259 /* Decrement with worker barrier */
260 fwrk->n_pending_connects -= n_connects;
261 if (fwrk->n_pending_connects > 0)
263 session_send_rpc_evt_to_thread_force (fwrk->vm->thread_index,
264 session_mq_handle_connects_rpc, 0);
269 session_mq_connect_handler (session_worker_t *wrk, session_evt_elt_t *elt)
271 u32 thread_index = wrk - session_main.wrk;
272 session_evt_elt_t *he;
274 if (PREDICT_FALSE (thread_index > transport_cl_thread ()))
276 clib_warning ("Connect on wrong thread. Dropping");
280 /* If on worker, check if main has any pending messages. Avoids reordering
281 * with other control messages that need to be handled by main
285 he = clib_llist_elt (wrk->event_elts, wrk->evts_pending_main);
287 /* Events pending on main, postpone to avoid reordering */
288 if (!clib_llist_is_empty (wrk->event_elts, evt_list, he))
290 clib_llist_add_tail (wrk->event_elts, evt_list, elt, he);
295 /* Add to pending list to be handled by first worker */
296 he = clib_llist_elt (wrk->event_elts, wrk->pending_connects);
297 clib_llist_add_tail (wrk->event_elts, evt_list, elt, he);
299 /* Decremented with worker barrier */
300 wrk->n_pending_connects += 1;
301 if (wrk->n_pending_connects == 1)
303 session_send_rpc_evt_to_thread_force (thread_index,
304 session_mq_handle_connects_rpc, 0);
309 session_mq_connect_uri_handler (session_worker_t *wrk, session_evt_elt_t *elt)
311 vnet_connect_args_t _a, *a = &_a;
312 session_connect_uri_msg_t *mp;
313 app_worker_t *app_wrk;
317 app_check_thread_and_barrier (wrk, elt);
319 mp = session_evt_ctrl_data (wrk, elt);
320 app = application_lookup (mp->client_index);
324 clib_memset (a, 0, sizeof (*a));
325 a->uri = (char *) mp->uri;
326 a->api_context = mp->context;
327 a->app_index = app->app_index;
328 if ((rv = vnet_connect_uri (a)))
330 session_worker_stat_error_inc (wrk, rv, 1);
331 app_wrk = application_get_worker (app, 0 /* default wrk only */ );
332 app_worker_connect_notify (app_wrk, 0, rv, mp->context);
337 session_mq_shutdown_handler (void *data)
339 session_shutdown_msg_t *mp = (session_shutdown_msg_t *) data;
340 vnet_shutdown_args_t _a, *a = &_a;
343 app = application_lookup (mp->client_index);
347 a->app_index = app->app_index;
348 a->handle = mp->handle;
349 vnet_shutdown_session (a);
353 session_mq_disconnect_handler (void *data)
355 session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data;
356 vnet_disconnect_args_t _a, *a = &_a;
359 app = application_lookup (mp->client_index);
363 a->app_index = app->app_index;
364 a->handle = mp->handle;
365 vnet_disconnect_session (a);
369 app_mq_detach_handler (session_worker_t *wrk, session_evt_elt_t *elt)
371 vnet_app_detach_args_t _a, *a = &_a;
372 session_app_detach_msg_t *mp;
375 app_check_thread_and_barrier (wrk, elt);
377 mp = session_evt_ctrl_data (wrk, elt);
378 app = application_lookup (mp->client_index);
382 a->app_index = app->app_index;
383 a->api_client_index = mp->client_index;
384 vnet_application_detach (a);
388 session_mq_unlisten_handler (session_worker_t *wrk, session_evt_elt_t *elt)
390 vnet_unlisten_args_t _a, *a = &_a;
391 session_unlisten_msg_t *mp;
392 app_worker_t *app_wrk;
397 app_check_thread_and_barrier (wrk, elt);
399 mp = session_evt_ctrl_data (wrk, elt);
402 app = application_lookup (mp->client_index);
406 clib_memset (a, 0, sizeof (*a));
407 a->app_index = app->app_index;
409 a->wrk_map_index = mp->wrk_index;
411 if ((rv = vnet_unlisten (a)))
412 session_worker_stat_error_inc (wrk, rv, 1);
414 app_wrk = application_get_worker (app, a->wrk_map_index);
418 app_worker_unlisten_reply (app_wrk, sh, mp->context, rv);
422 session_mq_accepted_reply_handler (session_worker_t *wrk,
423 session_evt_elt_t *elt)
425 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
426 session_accepted_reply_msg_t *mp;
427 session_state_t old_state;
428 app_worker_t *app_wrk;
431 mp = session_evt_ctrl_data (wrk, elt);
433 /* Mail this back from the main thread. We're not polling in main
434 * thread so we're using other workers for notifications. */
435 if (session_thread_from_handle (mp->handle) == 0 && vlib_num_workers () &&
436 vlib_get_thread_index () != 0)
438 session_wrk_send_evt_to_main (wrk, elt);
442 s = session_get_from_handle_if_valid (mp->handle);
446 app_wrk = app_worker_get (s->app_wrk_index);
447 if (app_wrk->app_index != mp->context)
449 clib_warning ("app doesn't own session");
453 /* Server isn't interested, disconnect the session */
456 a->app_index = mp->context;
457 a->handle = mp->handle;
458 vnet_disconnect_session (a);
459 s->app_wrk_index = SESSION_INVALID_INDEX;
463 /* Special handling for cut-through sessions */
464 if (!session_has_transport (s))
466 session_set_state (s, SESSION_STATE_READY);
467 ct_session_connect_notify (s, SESSION_E_NONE);
471 old_state = s->session_state;
472 session_set_state (s, SESSION_STATE_READY);
474 if (!svm_fifo_is_empty_prod (s->rx_fifo))
475 app_worker_rx_notify (app_wrk, s);
477 /* Closed while waiting for app to reply. Resend disconnect */
478 if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
480 app_worker_close_notify (app_wrk, s);
481 session_set_state (s, old_state);
487 session_mq_reset_reply_handler (void *data)
489 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
490 session_reset_reply_msg_t *mp;
491 app_worker_t *app_wrk;
494 u32 index, thread_index;
496 mp = (session_reset_reply_msg_t *) data;
497 app = application_lookup (mp->context);
501 session_parse_handle (mp->handle, &index, &thread_index);
502 s = session_get_if_valid (index, thread_index);
504 /* No session or not the right session */
505 if (!s || s->session_state < SESSION_STATE_TRANSPORT_CLOSING)
508 app_wrk = app_worker_get (s->app_wrk_index);
509 if (!app_wrk || app_wrk->app_index != app->app_index)
511 clib_warning ("App %u does not own handle 0x%lx!", app->app_index,
516 /* Client objected to resetting the session, log and continue */
519 clib_warning ("client retval %d", mp->retval);
523 /* This comes as a response to a reset, transport only waiting for
524 * confirmation to remove connection state, no need to disconnect */
525 a->handle = mp->handle;
526 a->app_index = app->app_index;
527 vnet_disconnect_session (a);
531 session_mq_disconnected_handler (void *data)
533 session_disconnected_reply_msg_t *rmp;
534 vnet_disconnect_args_t _a, *a = &_a;
535 svm_msg_q_msg_t _msg, *msg = &_msg;
536 session_disconnected_msg_t *mp;
537 app_worker_t *app_wrk;
538 session_event_t *evt;
543 mp = (session_disconnected_msg_t *) data;
544 if (!(s = session_get_from_handle_if_valid (mp->handle)))
546 clib_warning ("could not disconnect handle %llu", mp->handle);
549 app_wrk = app_worker_get (s->app_wrk_index);
550 app = application_lookup (mp->client_index);
551 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
553 clib_warning ("could not disconnect session: %llu app: %u",
554 mp->handle, mp->client_index);
558 a->handle = mp->handle;
559 a->app_index = app_wrk->wrk_index;
560 rv = vnet_disconnect_session (a);
562 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
563 SESSION_MQ_CTRL_EVT_RING,
565 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
566 clib_memset (evt, 0, sizeof (*evt));
567 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
568 rmp = (session_disconnected_reply_msg_t *) evt->data;
569 rmp->handle = mp->handle;
570 rmp->context = mp->context;
572 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
576 session_mq_disconnected_reply_handler (void *data)
578 session_disconnected_reply_msg_t *mp;
579 vnet_disconnect_args_t _a, *a = &_a;
582 mp = (session_disconnected_reply_msg_t *) data;
584 /* Client objected to disconnecting the session, log and continue */
587 clib_warning ("client retval %d", mp->retval);
591 /* Disconnect has been confirmed. Confirm close to transport */
592 app = application_lookup (mp->context);
595 a->handle = mp->handle;
596 a->app_index = app->app_index;
597 vnet_disconnect_session (a);
602 session_mq_worker_update_handler (void *data)
604 session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
605 session_worker_update_reply_msg_t *rmp;
606 svm_msg_q_msg_t _msg, *msg = &_msg;
607 app_worker_t *app_wrk;
608 u32 owner_app_wrk_map;
609 session_event_t *evt;
614 app = application_lookup (mp->client_index);
617 if (!(s = session_get_from_handle_if_valid (mp->handle)))
619 clib_warning ("invalid handle %llu", mp->handle);
622 app_wrk = app_worker_get (s->app_wrk_index);
623 if (app_wrk->app_index != app->app_index)
625 clib_warning ("app %u does not own session %llu", app->app_index,
629 owner_app_wrk_map = app_wrk->wrk_map_index;
630 app_wrk = application_get_worker (app, mp->wrk_index);
632 /* This needs to come from the new owner */
633 if (mp->req_wrk_index == owner_app_wrk_map)
635 session_req_worker_update_msg_t *wump;
637 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
638 SESSION_MQ_CTRL_EVT_RING,
640 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
641 clib_memset (evt, 0, sizeof (*evt));
642 evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
643 wump = (session_req_worker_update_msg_t *) evt->data;
644 wump->session_handle = mp->handle;
645 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
649 rv = app_worker_own_session (app_wrk, s);
651 session_stat_error_inc (rv, 1);
656 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
657 SESSION_MQ_CTRL_EVT_RING,
659 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
660 clib_memset (evt, 0, sizeof (*evt));
661 evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
662 rmp = (session_worker_update_reply_msg_t *) evt->data;
663 rmp->handle = mp->handle;
665 rmp->rx_fifo = fifo_segment_fifo_offset (s->rx_fifo);
667 rmp->tx_fifo = fifo_segment_fifo_offset (s->tx_fifo);
668 rmp->segment_handle = session_segment_handle (s);
669 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
672 * Retransmit messages that may have been lost
674 if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
675 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
677 if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
678 app_worker_rx_notify (app_wrk, s);
680 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
681 app_worker_close_notify (app_wrk, s);
685 session_mq_app_wrk_rpc_handler (void *data)
687 session_app_wrk_rpc_msg_t *mp = (session_app_wrk_rpc_msg_t *) data;
688 svm_msg_q_msg_t _msg, *msg = &_msg;
689 session_app_wrk_rpc_msg_t *rmp;
690 app_worker_t *app_wrk;
691 session_event_t *evt;
694 app = application_lookup (mp->client_index);
698 app_wrk = application_get_worker (app, mp->wrk_index);
700 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
701 SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT,
703 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
704 clib_memset (evt, 0, sizeof (*evt));
705 evt->event_type = SESSION_CTRL_EVT_APP_WRK_RPC;
706 rmp = (session_app_wrk_rpc_msg_t *) evt->data;
707 clib_memcpy (rmp->data, mp->data, sizeof (mp->data));
708 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
712 session_mq_transport_attr_handler (void *data)
714 session_transport_attr_msg_t *mp = (session_transport_attr_msg_t *) data;
715 session_transport_attr_reply_msg_t *rmp;
716 svm_msg_q_msg_t _msg, *msg = &_msg;
717 app_worker_t *app_wrk;
718 session_event_t *evt;
723 app = application_lookup (mp->client_index);
727 if (!(s = session_get_from_handle_if_valid (mp->handle)))
729 clib_warning ("invalid handle %llu", mp->handle);
732 app_wrk = app_worker_get (s->app_wrk_index);
733 if (app_wrk->app_index != app->app_index)
735 clib_warning ("app %u does not own session %llu", app->app_index,
740 rv = session_transport_attribute (s, mp->is_get, &mp->attr);
742 svm_msg_q_lock_and_alloc_msg_w_ring (
743 app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg);
744 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
745 clib_memset (evt, 0, sizeof (*evt));
746 evt->event_type = SESSION_CTRL_EVT_TRANSPORT_ATTR_REPLY;
747 rmp = (session_transport_attr_reply_msg_t *) evt->data;
748 rmp->handle = mp->handle;
750 rmp->is_get = mp->is_get;
751 if (!rv && mp->is_get)
752 rmp->attr = mp->attr;
753 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
757 session_wrk_handle_evts_main_rpc (void *args)
759 vlib_main_t *vm = vlib_get_main ();
760 clib_llist_index_t ei, next_ei;
761 session_evt_elt_t *he, *elt;
762 session_worker_t *fwrk;
765 vlib_worker_thread_barrier_sync (vm);
767 thread_index = pointer_to_uword (args);
768 fwrk = session_main_get_worker (thread_index);
770 he = clib_llist_elt (fwrk->event_elts, fwrk->evts_pending_main);
771 ei = clib_llist_next_index (he, evt_list);
773 while (ei != fwrk->evts_pending_main)
775 elt = clib_llist_elt (fwrk->event_elts, ei);
776 next_ei = clib_llist_next_index (elt, evt_list);
777 clib_llist_remove (fwrk->event_elts, evt_list, elt);
778 switch (elt->evt.event_type)
780 case SESSION_CTRL_EVT_LISTEN:
781 session_mq_listen_handler (fwrk, elt);
783 case SESSION_CTRL_EVT_UNLISTEN:
784 session_mq_unlisten_handler (fwrk, elt);
786 case SESSION_CTRL_EVT_APP_DETACH:
787 app_mq_detach_handler (fwrk, elt);
789 case SESSION_CTRL_EVT_CONNECT_URI:
790 session_mq_connect_uri_handler (fwrk, elt);
792 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
793 session_mq_accepted_reply_handler (fwrk, elt);
795 case SESSION_CTRL_EVT_CONNECT:
796 session_mq_connect_handler (fwrk, elt);
799 clib_warning ("unhandled %u", elt->evt.event_type);
804 /* Regrab element in case pool moved */
805 elt = clib_llist_elt (fwrk->event_elts, ei);
806 if (!clib_llist_elt_is_linked (elt, evt_list))
808 session_evt_ctrl_data_free (fwrk, elt);
809 clib_llist_put (fwrk->event_elts, elt);
814 vlib_worker_thread_barrier_release (vm);
817 vlib_node_registration_t session_queue_node;
822 u32 server_thread_index;
823 } session_queue_trace_t;
825 /* packet trace format function */
827 format_session_queue_trace (u8 * s, va_list * args)
829 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
830 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
831 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
833 s = format (s, "session index %d thread index %d",
834 t->session_index, t->server_thread_index);
838 #define foreach_session_queue_error \
839 _ (TX, tx, INFO, "Packets transmitted") \
840 _ (TIMER, timer, INFO, "Timer events") \
841 _ (NO_BUFFER, no_buffer, ERROR, "Out of buffers")
845 #define _(f, n, s, d) SESSION_QUEUE_ERROR_##f,
846 foreach_session_queue_error
848 SESSION_QUEUE_N_ERROR,
849 } session_queue_error_t;
851 static vlib_error_desc_t session_error_counters[] = {
852 #define _(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s },
853 foreach_session_queue_error
859 SESSION_TX_NO_BUFFERS = -2,
865 session_tx_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
866 u32 next_index, vlib_buffer_t **bufs, u16 n_segs,
867 session_t *s, u32 n_trace)
869 vlib_buffer_t **b = bufs;
871 while (n_trace && n_segs)
873 if (PREDICT_TRUE (vlib_trace_buffer (vm, node, next_index, b[0],
874 1 /* follow_chain */)))
876 session_queue_trace_t *t =
877 vlib_add_trace (vm, node, b[0], sizeof (*t));
878 t->session_index = s->session_index;
879 t->server_thread_index = s->thread_index;
885 vlib_set_trace_count (vm, node, n_trace);
889 session_tx_fill_dma_transfers (session_worker_t *wrk,
890 session_tx_context_t *ctx, vlib_buffer_t *b)
892 vlib_main_t *vm = wrk->vm;
895 int n_bytes_read, len_write;
896 svm_fifo_seg_t data_fs[2];
901 * Start with the first buffer in chain
904 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
906 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
907 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
909 n_bytes_read = svm_fifo_segments (ctx->s->tx_fifo, ctx->sp.tx_offset,
910 data_fs, &n_segs, len_to_deq);
912 len_write = n_bytes_read;
913 ASSERT (n_bytes_read == len_to_deq);
918 vlib_dma_batch_add (vm, wrk->batch, data0, data_fs[n_transfers].data,
919 data_fs[n_transfers].len);
920 data0 += data_fs[n_transfers].len;
921 n_bytes_read -= data_fs[n_transfers].len;
928 session_tx_fill_dma_transfers_tail (session_worker_t *wrk,
929 session_tx_context_t *ctx,
930 vlib_buffer_t *b, u32 len_to_deq, u8 *data)
932 vlib_main_t *vm = wrk->vm;
933 int n_bytes_read, len_write;
934 svm_fifo_seg_t data_fs[2];
938 n_bytes_read = svm_fifo_segments (ctx->s->tx_fifo, ctx->sp.tx_offset,
939 data_fs, &n_segs, len_to_deq);
941 len_write = n_bytes_read;
943 ASSERT (n_bytes_read == len_to_deq);
948 vlib_dma_batch_add (vm, wrk->batch, data, data_fs[n_transfers].data,
949 data_fs[n_transfers].len);
950 data += data_fs[n_transfers].len;
951 n_bytes_read -= data_fs[n_transfers].len;
959 session_tx_copy_data (session_worker_t *wrk, session_tx_context_t *ctx,
960 vlib_buffer_t *b, u32 len_to_deq, u8 *data0)
963 if (PREDICT_TRUE (!wrk->dma_enabled))
965 svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset, len_to_deq, data0);
967 n_bytes_read = session_tx_fill_dma_transfers (wrk, ctx, b);
972 session_tx_copy_data_tail (session_worker_t *wrk, session_tx_context_t *ctx,
973 vlib_buffer_t *b, u32 len_to_deq, u8 *data)
976 if (PREDICT_TRUE (!wrk->dma_enabled))
978 svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset, len_to_deq, data);
981 session_tx_fill_dma_transfers_tail (wrk, ctx, b, len_to_deq, data);
986 session_tx_fifo_chain_tail (session_worker_t *wrk, session_tx_context_t *ctx,
987 vlib_buffer_t *b, u16 *n_bufs, u8 peek_data)
989 vlib_main_t *vm = wrk->vm;
990 vlib_buffer_t *chain_b, *prev_b;
991 u32 chain_bi0, to_deq, left_from_seg;
992 int len_to_deq, n_bytes_read;
995 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
996 b->total_length_not_including_first_buffer = 0;
999 left_from_seg = clib_min (ctx->sp.snd_mss - b->current_length,
1001 to_deq = left_from_seg;
1002 for (j = 1; j < ctx->n_bufs_per_seg; j++)
1005 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
1008 chain_bi0 = ctx->tx_buffers[*n_bufs];
1009 chain_b = vlib_get_buffer (vm, chain_bi0);
1010 chain_b->current_data = 0;
1011 data = vlib_buffer_get_current (chain_b);
1015 session_tx_copy_data_tail (wrk, ctx, b, len_to_deq, data);
1016 ctx->sp.tx_offset += n_bytes_read;
1020 if (ctx->transport_vft->transport_options.tx_type ==
1023 svm_fifo_t *f = ctx->s->tx_fifo;
1024 session_dgram_hdr_t *hdr = &ctx->hdr;
1028 deq_now = clib_min (hdr->data_length - hdr->data_offset,
1030 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
1031 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data);
1032 ASSERT (n_bytes_read > 0);
1034 hdr->data_offset += n_bytes_read;
1035 if (hdr->data_offset == hdr->data_length)
1037 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
1038 svm_fifo_dequeue_drop (f, offset);
1039 if (ctx->left_to_snd > n_bytes_read)
1040 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
1043 else if (ctx->left_to_snd == n_bytes_read)
1044 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
1045 sizeof (session_dgram_pre_hdr_t));
1048 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
1051 ASSERT (n_bytes_read == len_to_deq);
1052 chain_b->current_length = n_bytes_read;
1053 b->total_length_not_including_first_buffer += chain_b->current_length;
1055 /* update previous buffer */
1056 prev_b->next_buffer = chain_bi0;
1057 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
1059 /* update current buffer */
1060 chain_b->next_buffer = 0;
1062 to_deq -= n_bytes_read;
1067 && b->total_length_not_including_first_buffer == left_from_seg);
1068 ctx->left_to_snd -= left_from_seg;
1072 session_tx_fill_buffer (session_worker_t *wrk, session_tx_context_t *ctx,
1073 vlib_buffer_t *b, u16 *n_bufs, u8 peek_data)
1079 * Start with the first buffer in chain
1082 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
1083 b->current_data = 0;
1085 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
1086 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
1090 n_bytes_read = session_tx_copy_data (wrk, ctx, b, len_to_deq, data0);
1091 ASSERT (n_bytes_read > 0);
1092 /* Keep track of progress locally, transport is also supposed to
1093 * increment it independently when pushing the header */
1094 ctx->sp.tx_offset += n_bytes_read;
1098 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1100 session_dgram_hdr_t *hdr = &ctx->hdr;
1101 svm_fifo_t *f = ctx->s->tx_fifo;
1105 ASSERT (hdr->data_length > hdr->data_offset);
1106 deq_now = clib_min (hdr->data_length - hdr->data_offset,
1108 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
1109 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
1110 ASSERT (n_bytes_read > 0);
1112 if (transport_connection_is_cless (ctx->tc))
1114 clib_memcpy_fast (data0 - sizeof (session_dgram_hdr_t), hdr,
1117 hdr->data_offset += n_bytes_read;
1118 if (hdr->data_offset == hdr->data_length)
1120 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
1121 svm_fifo_dequeue_drop (f, offset);
1122 if (ctx->left_to_snd > n_bytes_read)
1123 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
1126 else if (ctx->left_to_snd == n_bytes_read)
1127 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
1128 sizeof (session_dgram_pre_hdr_t));
1132 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
1134 ASSERT (n_bytes_read > 0);
1138 b->current_length = n_bytes_read;
1139 ctx->left_to_snd -= n_bytes_read;
1142 * Fill in the remaining buffers in the chain, if any
1144 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
1145 session_tx_fifo_chain_tail (wrk, ctx, b, n_bufs, peek_data);
1149 session_tx_not_ready (session_t * s, u8 peek_data)
1153 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
1155 /* Can retransmit for closed sessions but can't send new data if
1156 * session is not ready or closed */
1157 else if (s->session_state < SESSION_STATE_READY)
1159 /* Allow accepting session to send custom packets.
1160 * For instance, tcp want to send acks in established, but
1161 * the app has not called accept() yet */
1162 if (s->session_state == SESSION_STATE_ACCEPTING &&
1163 (s->flags & SESSION_F_CUSTOM_TX))
1167 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
1169 /* Allow closed transports to still send custom packets.
1170 * For instance, tcp may want to send acks in time-wait. */
1171 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
1172 && (s->flags & SESSION_F_CUSTOM_TX))
1179 if (s->session_state == SESSION_STATE_TRANSPORT_DELETED)
1185 always_inline transport_connection_t *
1186 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
1190 return ctx->transport_vft->get_connection (ctx->s->connection_index,
1191 ctx->s->thread_index);
1195 if (ctx->s->session_state == SESSION_STATE_LISTENING)
1196 return ctx->transport_vft->get_listener (ctx->s->connection_index);
1199 return ctx->transport_vft->get_connection (ctx->s->connection_index,
1200 ctx->s->thread_index);
1206 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
1207 u32 max_segs, u8 peek_data)
1209 u32 n_bytes_per_buf, n_bytes_per_seg;
1211 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
1212 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
1216 /* Offset in rx fifo from where to peek data */
1217 if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue))
1219 ctx->max_len_to_snd = 0;
1222 ctx->max_dequeue -= ctx->sp.tx_offset;
1226 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1228 u32 len, chain_limit;
1230 if (ctx->max_dequeue <= sizeof (ctx->hdr))
1232 ctx->max_len_to_snd = 0;
1236 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
1238 /* Zero length dgrams not supported */
1239 if (PREDICT_FALSE (ctx->hdr.data_length == 0))
1241 svm_fifo_dequeue_drop (ctx->s->tx_fifo, sizeof (ctx->hdr));
1242 ctx->max_len_to_snd = 0;
1245 /* We cannot be sure apps have not enqueued incomplete dgrams */
1246 if (PREDICT_FALSE (ctx->max_dequeue <
1247 ctx->hdr.data_length + sizeof (ctx->hdr)))
1249 ctx->max_len_to_snd = 0;
1252 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
1253 len = ctx->hdr.data_length - ctx->hdr.data_offset;
1255 if (ctx->hdr.gso_size)
1257 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, ctx->hdr.gso_size);
1260 /* Process multiple dgrams if smaller than min (buf_space, mss).
1261 * This avoids handling multiple dgrams if they require buffer
1263 chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN,
1265 if (ctx->hdr.data_length <= chain_limit)
1267 u32 first_dgram_len, dgram_len, offset, max_offset;
1268 session_dgram_hdr_t hdr;
1270 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len);
1271 offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t);
1272 first_dgram_len = len;
1273 max_offset = clib_min (ctx->max_dequeue, 16 << 10);
1275 while (offset < max_offset)
1277 svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
1279 dgram_len = hdr.data_length - hdr.data_offset;
1280 if (offset + sizeof (hdr) + hdr.data_length >
1282 first_dgram_len != dgram_len)
1284 /* Assert here to allow test above with zero length dgrams */
1285 ASSERT (hdr.data_length > hdr.data_offset);
1287 offset += sizeof (hdr) + hdr.data_length;
1291 ctx->max_dequeue = len;
1294 ASSERT (ctx->max_dequeue > 0);
1296 /* Ensure we're not writing more than transport window allows */
1297 if (ctx->max_dequeue < ctx->sp.snd_space)
1299 /* Constrained by tx queue. Try to send only fully formed segments */
1300 ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ?
1301 (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) :
1307 /* Expectation is that snd_space0 is already a multiple of snd_mss */
1308 ctx->max_len_to_snd = ctx->sp.snd_space;
1311 /* Check if we're tx constrained by the node */
1312 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss);
1313 if (ctx->n_segs_per_evt > max_segs)
1315 ctx->n_segs_per_evt = max_segs;
1316 ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss;
1319 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
1320 if (ctx->n_segs_per_evt > 1)
1322 u32 n_bytes_last_seg, n_bufs_last_seg;
1324 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss;
1325 n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd
1326 - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss);
1327 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
1328 n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf);
1329 ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg)
1334 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd;
1335 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
1336 ctx->n_bufs_needed = ctx->n_bufs_per_seg;
1339 ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf);
1340 ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss,
1342 TRANSPORT_MAX_HDRS_LEN);
1346 session_tx_maybe_reschedule (session_worker_t * wrk,
1347 session_tx_context_t * ctx,
1348 session_evt_elt_t * elt)
1350 session_t *s = ctx->s;
1352 svm_fifo_unset_event (s->tx_fifo);
1353 if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset)
1355 if (svm_fifo_set_event (s->tx_fifo))
1356 session_evt_add_head_old (wrk, elt);
1360 transport_connection_deschedule (ctx->tc);
1365 session_tx_add_pending_buffer (session_worker_t *wrk, u32 bi, u32 next_index)
1367 if (PREDICT_TRUE (!wrk->dma_enabled))
1369 vec_add1 (wrk->pending_tx_buffers, bi);
1370 vec_add1 (wrk->pending_tx_nexts, next_index);
1374 session_dma_transfer *dma_transfer = &wrk->dma_trans[wrk->trans_tail];
1375 vec_add1 (dma_transfer->pending_tx_buffers, bi);
1376 vec_add1 (dma_transfer->pending_tx_nexts, next_index);
1381 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
1382 vlib_node_runtime_t * node,
1383 session_evt_elt_t * elt,
1384 int *n_tx_packets, u8 peek_data)
1386 u32 n_trace, n_left, pbi, next_index, max_burst;
1387 session_tx_context_t *ctx = &wrk->ctx;
1388 session_main_t *smm = &session_main;
1389 session_event_t *e = &elt->evt;
1390 vlib_main_t *vm = wrk->vm;
1391 transport_proto_t tp;
1395 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
1398 session_evt_add_old (wrk, elt);
1399 return SESSION_TX_NO_DATA;
1402 next_index = smm->session_type_to_next[ctx->s->session_type];
1403 max_burst = SESSION_NODE_FRAME_SIZE - *n_tx_packets;
1405 tp = session_get_transport_proto (ctx->s);
1406 ctx->transport_vft = transport_protocol_get_vft (tp);
1407 ctx->tc = session_tx_get_transport (ctx, peek_data);
1409 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
1411 if (ctx->transport_vft->flush_data)
1412 ctx->transport_vft->flush_data (ctx->tc);
1413 e->event_type = SESSION_IO_EVT_TX;
1416 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
1419 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
1420 ctx->sp.max_burst_size = max_burst;
1421 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp);
1422 *n_tx_packets += n_custom_tx;
1424 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1425 return SESSION_TX_OK;
1426 max_burst -= n_custom_tx;
1427 if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX))
1429 session_evt_add_old (wrk, elt);
1430 return SESSION_TX_OK;
1434 /* Connection previously descheduled because it had no data to send.
1435 * Clear descheduled flag and reset pacer if in use */
1436 if (transport_connection_is_descheduled (ctx->tc))
1437 transport_connection_clear_descheduled (ctx->tc);
1439 transport_connection_snd_params (ctx->tc, &ctx->sp);
1441 if (!ctx->sp.snd_space)
1443 /* If the deschedule flag was set, remove session from scheduler.
1444 * Transport is responsible for rescheduling this session. */
1445 if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED)
1446 transport_connection_deschedule (ctx->tc);
1447 /* Request to postpone the session, e.g., zero-wnd and transport
1448 * is not currently probing */
1449 else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE)
1450 session_evt_add_old (wrk, elt);
1451 /* This flow queue is "empty" so it should be re-evaluated before
1452 * the ones that have data to send. */
1454 session_evt_add_head_old (wrk, elt);
1456 return SESSION_TX_NO_DATA;
1459 if (transport_connection_is_tx_paced (ctx->tc))
1461 u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc);
1462 if (snd_space < TRANSPORT_PACER_MIN_BURST)
1464 session_evt_add_head_old (wrk, elt);
1465 return SESSION_TX_NO_DATA;
1467 snd_space = clib_min (ctx->sp.snd_space, snd_space);
1468 ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ?
1469 snd_space - snd_space % ctx->sp.snd_mss : snd_space;
1472 /* Check how much we can pull. */
1473 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
1475 if (PREDICT_FALSE (!ctx->max_len_to_snd))
1477 transport_connection_tx_pacer_reset_bucket (ctx->tc, 0);
1478 session_tx_maybe_reschedule (wrk, ctx, elt);
1479 return SESSION_TX_NO_DATA;
1482 vec_validate_aligned (ctx->tx_buffers, ctx->n_bufs_needed - 1,
1483 CLIB_CACHE_LINE_BYTES);
1484 n_bufs = vlib_buffer_alloc (vm, ctx->tx_buffers, ctx->n_bufs_needed);
1485 if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed))
1488 vlib_buffer_free (vm, ctx->tx_buffers, n_bufs);
1489 session_evt_add_head_old (wrk, elt);
1490 vlib_node_increment_counter (wrk->vm, node->node_index,
1491 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
1492 return SESSION_TX_NO_BUFFERS;
1495 if (transport_connection_is_tx_paced (ctx->tc))
1496 transport_connection_tx_pacer_update_bytes (ctx->tc, ctx->max_len_to_snd);
1498 ctx->left_to_snd = ctx->max_len_to_snd;
1499 n_left = ctx->n_segs_per_evt;
1501 vec_validate (ctx->transport_pending_bufs, n_left);
1505 vlib_buffer_t *b0, *b1;
1508 pbi = ctx->tx_buffers[n_bufs - 3];
1509 pb = vlib_get_buffer (vm, pbi);
1510 vlib_prefetch_buffer_header (pb, STORE);
1511 pbi = ctx->tx_buffers[n_bufs - 4];
1512 pb = vlib_get_buffer (vm, pbi);
1513 vlib_prefetch_buffer_header (pb, STORE);
1515 bi0 = ctx->tx_buffers[--n_bufs];
1516 bi1 = ctx->tx_buffers[--n_bufs];
1518 b0 = vlib_get_buffer (vm, bi0);
1519 b1 = vlib_get_buffer (vm, bi1);
1521 session_tx_fill_buffer (wrk, ctx, b0, &n_bufs, peek_data);
1522 session_tx_fill_buffer (wrk, ctx, b1, &n_bufs, peek_data);
1524 ctx->transport_pending_bufs[ctx->n_segs_per_evt - n_left] = b0;
1525 ctx->transport_pending_bufs[ctx->n_segs_per_evt - n_left + 1] = b1;
1528 session_tx_add_pending_buffer (wrk, bi0, next_index);
1529 session_tx_add_pending_buffer (wrk, bi1, next_index);
1538 pbi = ctx->tx_buffers[n_bufs - 2];
1539 pb = vlib_get_buffer (vm, pbi);
1540 vlib_prefetch_buffer_header (pb, STORE);
1543 bi0 = ctx->tx_buffers[--n_bufs];
1544 b0 = vlib_get_buffer (vm, bi0);
1545 session_tx_fill_buffer (wrk, ctx, b0, &n_bufs, peek_data);
1547 ctx->transport_pending_bufs[ctx->n_segs_per_evt - n_left] = b0;
1550 session_tx_add_pending_buffer (wrk, bi0, next_index);
1553 /* Ask transport to push headers */
1554 ctx->transport_vft->push_header (ctx->tc, ctx->transport_pending_bufs,
1555 ctx->n_segs_per_evt);
1557 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
1558 session_tx_trace_frame (vm, node, next_index, ctx->transport_pending_bufs,
1559 ctx->n_segs_per_evt, ctx->s, n_trace);
1561 if (PREDICT_FALSE (n_bufs))
1562 vlib_buffer_free (vm, ctx->tx_buffers, n_bufs);
1564 *n_tx_packets += ctx->n_segs_per_evt;
1566 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
1567 ctx->s->tx_fifo->shr->has_event, wrk->last_vlib_time);
1569 ASSERT (ctx->left_to_snd == 0);
1571 /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise,
1572 * check if application enqueued more data and reschedule accordingly */
1573 if (ctx->max_len_to_snd < ctx->max_dequeue)
1574 session_evt_add_old (wrk, elt);
1576 session_tx_maybe_reschedule (wrk, ctx, elt);
1580 u32 n_dequeued = ctx->max_len_to_snd;
1581 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1582 n_dequeued += ctx->n_segs_per_evt * SESSION_CONN_HDR_LEN;
1583 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, n_dequeued))
1584 session_dequeue_notify (ctx->s);
1586 return SESSION_TX_OK;
1590 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1591 vlib_node_runtime_t * node,
1592 session_evt_elt_t * e, int *n_tx_packets)
1594 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1598 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1599 vlib_node_runtime_t * node,
1600 session_evt_elt_t * e, int *n_tx_packets)
1602 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1606 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1607 vlib_node_runtime_t * node,
1608 session_evt_elt_t * elt, int *n_tx_packets)
1610 transport_send_params_t *sp = &wrk->ctx.sp;
1611 session_t *s = wrk->ctx.s;
1612 clib_llist_index_t ei;
1615 if (PREDICT_FALSE ((s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) ||
1616 (s->session_state == SESSION_STATE_CONNECTING &&
1617 (s->flags & SESSION_F_HALF_OPEN))))
1620 /* Clear custom-tx flag used to request reschedule for tx */
1621 s->flags &= ~SESSION_F_CUSTOM_TX;
1624 sp->bytes_dequeued = 0;
1625 sp->max_burst_size = clib_min (SESSION_NODE_FRAME_SIZE - *n_tx_packets,
1626 TRANSPORT_PACER_MAX_BURST_PKTS);
1628 /* Grab elt index since app transports can enqueue events on tx */
1629 ei = clib_llist_entry_index (wrk->event_elts, elt);
1631 n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp);
1632 *n_tx_packets += n_packets;
1634 elt = clib_llist_elt (wrk->event_elts, ei);
1636 if (s->flags & SESSION_F_CUSTOM_TX)
1638 session_evt_add_old (wrk, elt);
1640 else if (!(sp->flags & TRANSPORT_SND_F_DESCHED))
1642 svm_fifo_unset_event (s->tx_fifo);
1643 if (svm_fifo_max_dequeue_cons (s->tx_fifo))
1644 if (svm_fifo_set_event (s->tx_fifo))
1645 session_evt_add_head_old (wrk, elt);
1648 if (sp->bytes_dequeued &&
1649 svm_fifo_needs_deq_ntf (s->tx_fifo, sp->bytes_dequeued))
1650 session_dequeue_notify (s);
1655 always_inline session_t *
1656 session_event_get_session (session_worker_t * wrk, session_event_t * e)
1658 if (PREDICT_FALSE (pool_is_free_index (wrk->sessions, e->session_index)))
1661 ASSERT (session_is_valid (e->session_index, wrk->vm->thread_index));
1662 return pool_elt_at_index (wrk->sessions, e->session_index);
1666 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1668 clib_llist_index_t ei;
1669 void (*fp) (void *);
1673 ei = clib_llist_entry_index (wrk->event_elts, elt);
1676 switch (e->event_type)
1678 case SESSION_CTRL_EVT_RPC:
1679 fp = e->rpc_args.fp;
1680 (*fp) (e->rpc_args.arg);
1682 case SESSION_CTRL_EVT_HALF_CLOSE:
1683 s = session_get_from_handle_if_valid (e->session_handle);
1684 if (PREDICT_FALSE (!s))
1686 session_transport_half_close (s);
1688 case SESSION_CTRL_EVT_CLOSE:
1689 s = session_get_from_handle_if_valid (e->session_handle);
1690 if (PREDICT_FALSE (!s))
1692 session_transport_close (s);
1694 case SESSION_CTRL_EVT_RESET:
1695 s = session_get_from_handle_if_valid (e->session_handle);
1696 if (PREDICT_FALSE (!s))
1698 session_transport_reset (s);
1700 case SESSION_CTRL_EVT_LISTEN:
1701 session_mq_listen_handler (wrk, elt);
1703 case SESSION_CTRL_EVT_LISTEN_URI:
1704 session_mq_listen_uri_handler (wrk, elt);
1706 case SESSION_CTRL_EVT_UNLISTEN:
1707 session_mq_unlisten_handler (wrk, elt);
1709 case SESSION_CTRL_EVT_CONNECT:
1710 session_mq_connect_handler (wrk, elt);
1712 case SESSION_CTRL_EVT_CONNECT_URI:
1713 session_mq_connect_uri_handler (wrk, elt);
1715 case SESSION_CTRL_EVT_SHUTDOWN:
1716 session_mq_shutdown_handler (session_evt_ctrl_data (wrk, elt));
1718 case SESSION_CTRL_EVT_DISCONNECT:
1719 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1721 case SESSION_CTRL_EVT_DISCONNECTED:
1722 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1724 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1725 session_mq_accepted_reply_handler (wrk, elt);
1727 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1728 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1731 case SESSION_CTRL_EVT_RESET_REPLY:
1732 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1734 case SESSION_CTRL_EVT_WORKER_UPDATE:
1735 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1737 case SESSION_CTRL_EVT_APP_DETACH:
1738 app_mq_detach_handler (wrk, elt);
1740 case SESSION_CTRL_EVT_APP_WRK_RPC:
1741 session_mq_app_wrk_rpc_handler (session_evt_ctrl_data (wrk, elt));
1743 case SESSION_CTRL_EVT_TRANSPORT_ATTR:
1744 session_mq_transport_attr_handler (session_evt_ctrl_data (wrk, elt));
1747 clib_warning ("unhandled event type %d", e->event_type);
1750 /* Regrab elements in case pool moved */
1751 elt = clib_llist_elt (wrk->event_elts, ei);
1752 if (!clib_llist_elt_is_linked (elt, evt_list))
1755 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1756 session_evt_ctrl_data_free (wrk, elt);
1757 clib_llist_put (wrk->event_elts, elt);
1759 SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk);
1763 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1764 session_evt_elt_t * elt, int *n_tx_packets)
1766 session_main_t *smm = &session_main;
1767 app_worker_t *app_wrk;
1768 clib_llist_index_t ei;
1772 ei = clib_llist_entry_index (wrk->event_elts, elt);
1775 switch (e->event_type)
1777 case SESSION_IO_EVT_TX_FLUSH:
1778 case SESSION_IO_EVT_TX:
1779 s = session_event_get_session (wrk, e);
1780 if (PREDICT_FALSE (!s))
1782 CLIB_PREFETCH (s->tx_fifo, sizeof (*(s->tx_fifo)), LOAD);
1784 /* Spray packets in per session type frames, since they go to
1785 * different nodes */
1786 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1788 case SESSION_IO_EVT_RX:
1789 s = session_event_get_session (wrk, e);
1790 if (!s || s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
1792 transport_app_rx_evt (session_get_transport_proto (s),
1793 s->connection_index, s->thread_index);
1795 case SESSION_IO_EVT_BUILTIN_RX:
1796 s = session_event_get_session (wrk, e);
1797 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1799 svm_fifo_unset_event (s->rx_fifo);
1800 app_wrk = app_worker_get (s->app_wrk_index);
1801 app_worker_rx_notify (app_wrk, s);
1803 case SESSION_IO_EVT_TX_MAIN:
1804 s = session_get_if_valid (e->session_index, 0 /* main thread */);
1805 if (PREDICT_FALSE (!s))
1808 if (PREDICT_TRUE (s != 0))
1809 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1812 clib_warning ("unhandled event type %d", e->event_type);
1815 SESSION_EVT (SESSION_EVT_IO_EVT_COUNTS, e->event_type, 1, wrk);
1817 /* Regrab elements in case pool moved */
1818 elt = clib_llist_elt (wrk->event_elts, ei);
1819 if (!clib_llist_elt_is_linked (elt, evt_list))
1820 clib_llist_put (wrk->event_elts, elt);
1824 static const u32 session_evt_msg_sizes[] = {
1825 #define _(symc, sym) \
1826 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1827 foreach_session_ctrl_evt
1833 session_update_time_subscribers (session_main_t *smm, clib_time_type_t now,
1836 session_update_time_fn *fn;
1838 vec_foreach (fn, smm->update_time_fns)
1839 (*fn) (now, thread_index);
1843 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1845 session_evt_elt_t *elt;
1847 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1849 elt = session_evt_alloc_ctrl (wrk);
1850 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1852 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1853 elt->evt.event_type = evt->event_type;
1854 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1855 session_evt_msg_sizes[evt->event_type]);
1859 /* Internal control events fit into io events footprint */
1860 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1865 elt = session_evt_alloc_new (wrk);
1866 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1871 session_flush_pending_tx_buffers (session_worker_t * wrk,
1872 vlib_node_runtime_t * node)
1874 vlib_buffer_enqueue_to_next_vec (wrk->vm, node, &wrk->pending_tx_buffers,
1875 &wrk->pending_tx_nexts,
1876 vec_len (wrk->pending_tx_nexts));
1877 vec_reset_length (wrk->pending_tx_buffers);
1878 vec_reset_length (wrk->pending_tx_nexts);
1882 session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq)
1884 svm_msg_q_msg_t _msg, *msg = &_msg;
1885 u32 i, n_to_dequeue = 0;
1886 session_event_t *evt;
1888 n_to_dequeue = svm_msg_q_size (mq);
1889 for (i = 0; i < n_to_dequeue; i++)
1891 svm_msg_q_sub_raw (mq, msg);
1892 evt = svm_msg_q_msg_data (mq, msg);
1893 session_evt_add_to_list (wrk, evt);
1894 svm_msg_q_free_msg (mq, msg);
1897 return n_to_dequeue;
1901 session_wrk_update_state (session_worker_t *wrk)
1903 vlib_main_t *vm = wrk->vm;
1905 if (wrk->state == SESSION_WRK_POLLING)
1907 if (clib_llist_elts (wrk->event_elts) == 5 &&
1908 vlib_last_vectors_per_main_loop (vm) < 1)
1910 session_wrk_set_state (wrk, SESSION_WRK_INTERRUPT);
1911 vlib_node_set_state (vm, session_queue_node.index,
1912 VLIB_NODE_STATE_INTERRUPT);
1915 else if (wrk->state == SESSION_WRK_INTERRUPT)
1917 if (clib_llist_elts (wrk->event_elts) > 5 ||
1918 vlib_last_vectors_per_main_loop (vm) > 1)
1920 session_wrk_set_state (wrk, SESSION_WRK_POLLING);
1921 vlib_node_set_state (vm, session_queue_node.index,
1922 VLIB_NODE_STATE_POLLING);
1924 else if (PREDICT_FALSE (!pool_elts (wrk->sessions)))
1926 session_wrk_set_state (wrk, SESSION_WRK_IDLE);
1931 if (clib_llist_elts (wrk->event_elts))
1933 session_wrk_set_state (wrk, SESSION_WRK_INTERRUPT);
1939 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1940 vlib_frame_t * frame)
1942 u32 thread_index = vm->thread_index, __clib_unused n_evts;
1943 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1944 session_main_t *smm = vnet_get_session_main ();
1945 session_worker_t *wrk = &smm->wrk[thread_index];
1946 clib_llist_index_t ei, next_ei, old_ti;
1949 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1951 session_wrk_update_time (wrk, vlib_time_now (vm));
1954 * Update transport time
1956 session_update_time_subscribers (smm, wrk->last_vlib_time, thread_index);
1957 n_tx_packets = vec_len (wrk->pending_tx_buffers);
1958 SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk);
1960 if (PREDICT_FALSE (wrk->dma_enabled))
1962 if (wrk->trans_head == ((wrk->trans_tail + 1) & (wrk->trans_size - 1)))
1964 wrk->batch = vlib_dma_batch_new (vm, wrk->config_index);
1970 * Dequeue new internal mq events
1973 n_evts = session_wrk_handle_mq (wrk, wrk->vpp_event_queue);
1974 SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_evts);
1977 * Handle control events
1980 ei = wrk->ctrl_head;
1981 ctrl_he = clib_llist_elt (wrk->event_elts, ei);
1982 next_ei = clib_llist_next_index (ctrl_he, evt_list);
1983 old_ti = clib_llist_prev_index (ctrl_he, evt_list);
1984 while (ei != old_ti)
1987 elt = clib_llist_elt (wrk->event_elts, next_ei);
1988 next_ei = clib_llist_next_index (elt, evt_list);
1989 clib_llist_remove (wrk->event_elts, evt_list, elt);
1990 session_event_dispatch_ctrl (wrk, elt);
1993 SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk);
1996 * Handle the new io events.
1999 new_he = clib_llist_elt (wrk->event_elts, wrk->new_head);
2000 old_he = clib_llist_elt (wrk->event_elts, wrk->old_head);
2001 old_ti = clib_llist_prev_index (old_he, evt_list);
2003 ei = clib_llist_next_index (new_he, evt_list);
2004 while (ei != wrk->new_head && n_tx_packets < SESSION_NODE_FRAME_SIZE)
2006 elt = clib_llist_elt (wrk->event_elts, ei);
2007 ei = clib_llist_next_index (elt, evt_list);
2008 clib_llist_remove (wrk->event_elts, evt_list, elt);
2009 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
2012 SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk);
2015 * Handle the old io events, if we had any prior to processing the new ones
2018 if (old_ti != wrk->old_head)
2020 old_he = clib_llist_elt (wrk->event_elts, wrk->old_head);
2021 ei = clib_llist_next_index (old_he, evt_list);
2023 while (n_tx_packets < SESSION_NODE_FRAME_SIZE)
2025 elt = clib_llist_elt (wrk->event_elts, ei);
2026 next_ei = clib_llist_next_index (elt, evt_list);
2027 clib_llist_remove (wrk->event_elts, evt_list, elt);
2029 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
2038 if (PREDICT_FALSE (wrk->dma_enabled))
2042 vlib_dma_batch_set_cookie (vm, wrk->batch, wrk->trans_tail);
2045 if (wrk->trans_tail == wrk->trans_size)
2046 wrk->trans_tail = 0;
2049 vlib_dma_batch_submit (vm, wrk->batch);
2052 SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk);
2054 if (vec_len (wrk->pending_tx_buffers))
2055 session_flush_pending_tx_buffers (wrk, node);
2057 vlib_node_increment_counter (vm, session_queue_node.index,
2058 SESSION_QUEUE_ERROR_TX, n_tx_packets);
2060 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
2062 if (wrk->flags & SESSION_WRK_F_ADAPTIVE)
2063 session_wrk_update_state (wrk);
2065 return n_tx_packets;
2069 VLIB_REGISTER_NODE (session_queue_node) = {
2070 .function = session_queue_node_fn,
2071 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
2072 .name = "session-queue",
2073 .format_trace = format_session_queue_trace,
2074 .type = VLIB_NODE_TYPE_INPUT,
2075 .n_errors = SESSION_QUEUE_N_ERROR,
2076 .error_counters = session_error_counters,
2077 .state = VLIB_NODE_STATE_DISABLED,
2081 static clib_error_t *
2082 session_wrk_tfd_read_ready (clib_file_t *cf)
2084 session_worker_t *wrk = session_main_get_worker (cf->private_data);
2088 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
2089 rv = read (wrk->timerfd, &buf, sizeof (buf));
2090 if (rv < 0 && errno != EAGAIN)
2091 clib_unix_warning ("failed");
2095 static clib_error_t *
2096 session_wrk_tfd_write_ready (clib_file_t *cf)
2102 session_wrk_enable_adaptive_mode (session_worker_t *wrk)
2104 u32 thread_index = wrk->vm->thread_index;
2105 clib_file_t template = { 0 };
2107 if ((wrk->timerfd = timerfd_create (CLOCK_MONOTONIC, TFD_NONBLOCK)) < 0)
2108 clib_warning ("timerfd_create");
2110 template.read_function = session_wrk_tfd_read_ready;
2111 template.write_function = session_wrk_tfd_write_ready;
2112 template.file_descriptor = wrk->timerfd;
2113 template.private_data = thread_index;
2114 template.polling_thread_index = thread_index;
2115 template.description = format (0, "session-wrk-tfd-%u", thread_index);
2117 wrk->timerfd_file = clib_file_add (&file_main, &template);
2118 wrk->flags |= SESSION_WRK_F_ADAPTIVE;
2121 static clib_error_t *
2122 session_queue_exit (vlib_main_t * vm)
2124 if (vlib_get_n_threads () < 2)
2128 * Shut off (especially) worker-thread session nodes.
2129 * Otherwise, vpp can crash as the main thread unmaps the
2132 vlib_worker_thread_barrier_sync (vm);
2133 session_node_enable_disable (0 /* is_enable */ );
2134 vlib_worker_thread_barrier_release (vm);
2138 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
2141 session_queue_run_on_main (vlib_main_t * vm)
2143 vlib_node_runtime_t *node;
2145 node = vlib_node_get_runtime (vm, session_queue_node.index);
2146 return session_queue_node_fn (vm, node, 0);
2150 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
2153 uword *event_data = 0;
2159 vlib_process_wait_for_event_or_clock (vm, timeout);
2160 event_type = vlib_process_get_events (vm, (uword **) & event_data);
2164 case SESSION_Q_PROCESS_RUN_ON_MAIN:
2165 /* Run session queue node on main thread */
2166 session_queue_run_on_main (vm);
2168 case SESSION_Q_PROCESS_STOP:
2169 vlib_node_set_state (vm, session_queue_process_node.index,
2170 VLIB_NODE_STATE_DISABLED);
2174 /* Timed out. Run on main to ensure all events are handled */
2175 session_queue_run_on_main (vm);
2178 vec_reset_length (event_data);
2184 VLIB_REGISTER_NODE (session_queue_process_node) =
2186 .function = session_queue_process,
2187 .type = VLIB_NODE_TYPE_PROCESS,
2188 .name = "session-queue-process",
2189 .state = VLIB_NODE_STATE_DISABLED,
2193 static_always_inline uword
2194 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2195 vlib_frame_t * frame)
2197 session_main_t *sm = &session_main;
2198 if (!sm->wrk[0].vpp_event_queue)
2200 node = vlib_node_get_runtime (vm, session_queue_node.index);
2201 return session_queue_node_fn (vm, node, frame);
2205 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
2207 .function = session_queue_pre_input_inline,
2208 .type = VLIB_NODE_TYPE_PRE_INPUT,
2209 .name = "session-queue-main",
2210 .state = VLIB_NODE_STATE_DISABLED,
2215 * fd.io coding-style-patch-verification: ON
2218 * eval: (c-set-style "gnu")