2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 * @brief Session and session manager
20 #include <vnet/session/session.h>
21 #include <vnet/session/session_debug.h>
22 #include <vnet/session/application.h>
23 #include <vlibmemory/api.h>
24 #include <vnet/dpo/load_balance.h>
25 #include <vnet/fib/ip4_fib.h>
27 session_manager_main_t session_manager_main;
28 extern transport_proto_vft_t *tp_vfts;
31 session_send_evt_to_thread (void *data, void *args, u32 thread_index,
32 session_evt_type_t evt_type)
37 u32 tries = 0, max_tries;
39 mq = session_manager_get_vpp_event_queue (thread_index);
40 while (svm_msg_q_try_lock (mq))
42 max_tries = vlib_get_current_process (vlib_get_main ())? 1e6 : 3;
43 if (tries++ == max_tries)
45 SESSION_DBG ("failed to enqueue evt");
49 if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
51 svm_msg_q_unlock (mq);
54 msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
55 if (PREDICT_FALSE (svm_msg_q_msg_is_invalid (&msg)))
57 svm_msg_q_unlock (mq);
60 evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
61 evt->event_type = evt_type;
65 evt->rpc_args.fp = data;
66 evt->rpc_args.arg = args;
68 case FIFO_EVENT_APP_TX:
69 case FIFO_EVENT_BUILTIN_RX:
72 case FIFO_EVENT_BUILTIN_TX:
73 case FIFO_EVENT_DISCONNECT:
74 evt->session_handle = session_handle ((stream_session_t *) data);
77 clib_warning ("evt unhandled!");
78 svm_msg_q_unlock (mq);
82 svm_msg_q_add_and_unlock (mq, &msg);
87 session_send_io_evt_to_thread (svm_fifo_t * f, session_evt_type_t evt_type)
89 return session_send_evt_to_thread (f, 0, f->master_thread_index, evt_type);
93 session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
94 session_evt_type_t evt_type)
96 return session_send_evt_to_thread (data, 0, thread_index, evt_type);
100 session_send_ctrl_evt_to_thread (stream_session_t * s,
101 session_evt_type_t evt_type)
103 /* only event supported for now is disconnect */
104 ASSERT (evt_type == FIFO_EVENT_DISCONNECT);
105 return session_send_evt_to_thread (s, 0, s->thread_index,
106 FIFO_EVENT_DISCONNECT);
110 session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
112 if (thread_index != vlib_get_thread_index ())
113 session_send_evt_to_thread (fp, rpc_args, thread_index, FIFO_EVENT_RPC);
116 void (*fnp) (void *) = fp;
122 session_alloc (u32 thread_index)
124 session_manager_main_t *smm = &session_manager_main;
127 pool_get_aligned_will_expand (smm->sessions[thread_index], will_expand,
128 CLIB_CACHE_LINE_BYTES);
129 /* If we have peekers, let them finish */
130 if (PREDICT_FALSE (will_expand && vlib_num_workers ()))
132 clib_rwlock_writer_lock (&smm->peekers_rw_locks[thread_index]);
133 pool_get_aligned (session_manager_main.sessions[thread_index], s,
134 CLIB_CACHE_LINE_BYTES);
135 clib_rwlock_writer_unlock (&smm->peekers_rw_locks[thread_index]);
139 pool_get_aligned (session_manager_main.sessions[thread_index], s,
140 CLIB_CACHE_LINE_BYTES);
142 memset (s, 0, sizeof (*s));
143 s->session_index = s - session_manager_main.sessions[thread_index];
144 s->thread_index = thread_index;
149 session_free (stream_session_t * s)
151 pool_put (session_manager_main.sessions[s->thread_index], s);
153 memset (s, 0xFA, sizeof (*s));
157 session_free_w_fifos (stream_session_t * s)
159 segment_manager_dealloc_fifos (s->svm_segment_index, s->server_rx_fifo,
165 session_alloc_fifos (segment_manager_t * sm, stream_session_t * s)
167 svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0;
168 u32 fifo_segment_index;
171 if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo,
173 &fifo_segment_index)))
175 /* Initialize backpointers */
176 server_rx_fifo->master_session_index = s->session_index;
177 server_rx_fifo->master_thread_index = s->thread_index;
179 server_tx_fifo->master_session_index = s->session_index;
180 server_tx_fifo->master_thread_index = s->thread_index;
182 s->server_rx_fifo = server_rx_fifo;
183 s->server_tx_fifo = server_tx_fifo;
184 s->svm_segment_index = fifo_segment_index;
188 static stream_session_t *
189 session_alloc_for_connection (transport_connection_t * tc)
192 u32 thread_index = tc->thread_index;
194 ASSERT (thread_index == vlib_get_thread_index ()
195 || transport_protocol_is_cl (tc->proto));
197 s = session_alloc (thread_index);
198 s->session_type = session_type_from_proto_and_ip (tc->proto, tc->is_ip4);
199 s->session_state = SESSION_STATE_CONNECTING;
200 s->enqueue_epoch = (u64) ~ 0;
202 /* Attach transport to session and vice versa */
203 s->connection_index = tc->c_index;
204 tc->s_index = s->session_index;
209 session_alloc_and_init (segment_manager_t * sm, transport_connection_t * tc,
210 u8 alloc_fifos, stream_session_t ** ret_s)
215 s = session_alloc_for_connection (tc);
216 if (alloc_fifos && (rv = session_alloc_fifos (sm, s)))
223 /* Add to the main lookup table */
224 session_lookup_add_connection (tc, session_handle (s));
231 * Discards bytes from buffer chain
233 * It discards n_bytes_to_drop starting at first buffer after chain_b
236 session_enqueue_discard_chain_bytes (vlib_main_t * vm, vlib_buffer_t * b,
237 vlib_buffer_t ** chain_b,
240 vlib_buffer_t *next = *chain_b;
241 u32 to_drop = n_bytes_to_drop;
242 ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
243 while (to_drop && (next->flags & VLIB_BUFFER_NEXT_PRESENT))
245 next = vlib_get_buffer (vm, next->next_buffer);
246 if (next->current_length > to_drop)
248 vlib_buffer_advance (next, to_drop);
253 to_drop -= next->current_length;
254 next->current_length = 0;
260 b->total_length_not_including_first_buffer -= n_bytes_to_drop;
264 * Enqueue buffer chain tail
267 session_enqueue_chain_tail (stream_session_t * s, vlib_buffer_t * b,
268 u32 offset, u8 is_in_order)
270 vlib_buffer_t *chain_b;
271 u32 chain_bi, len, diff;
272 vlib_main_t *vm = vlib_get_main ();
277 if (is_in_order && offset)
279 diff = offset - b->current_length;
280 if (diff > b->total_length_not_including_first_buffer)
283 session_enqueue_discard_chain_bytes (vm, b, &chain_b, diff);
284 chain_bi = vlib_get_buffer_index (vm, chain_b);
287 chain_bi = b->next_buffer;
291 chain_b = vlib_get_buffer (vm, chain_bi);
292 data = vlib_buffer_get_current (chain_b);
293 len = chain_b->current_length;
298 rv = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data);
305 return (rv > 0) ? (written + rv) : written;
311 /* written more than what was left in chain */
312 if (written > b->total_length_not_including_first_buffer)
315 /* drop the bytes that have already been delivered */
316 session_enqueue_discard_chain_bytes (vm, b, &chain_b, rv - len);
321 rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, len,
325 clib_warning ("failed to enqueue multi-buffer seg");
331 while ((chain_bi = (chain_b->flags & VLIB_BUFFER_NEXT_PRESENT)
332 ? chain_b->next_buffer : 0));
341 * Enqueue data for delivery to session peer. Does not notify peer of enqueue
342 * event but on request can queue notification events for later delivery by
343 * calling stream_server_flush_enqueue_events().
345 * @param tc Transport connection which is to be enqueued data
346 * @param b Buffer to be enqueued
347 * @param offset Offset at which to start enqueueing if out-of-order
348 * @param queue_event Flag to indicate if peer is to be notified or if event
349 * is to be queued. The former is useful when more data is
350 * enqueued and only one event is to be generated.
351 * @param is_in_order Flag to indicate if data is in order
352 * @return Number of bytes enqueued or a negative value if enqueueing failed.
355 session_enqueue_stream_connection (transport_connection_t * tc,
356 vlib_buffer_t * b, u32 offset,
357 u8 queue_event, u8 is_in_order)
360 int enqueued = 0, rv, in_order_off;
362 s = session_get (tc->s_index, tc->thread_index);
366 enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo,
368 vlib_buffer_get_current (b));
369 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT)
372 in_order_off = enqueued > b->current_length ? enqueued : 0;
373 rv = session_enqueue_chain_tail (s, b, in_order_off, 1);
380 rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset,
382 vlib_buffer_get_current (b));
383 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv))
384 session_enqueue_chain_tail (s, b, offset + b->current_length, 0);
385 /* if something was enqueued, report even this as success for ooo
386 * segment handling */
392 /* Queue RX event on this fifo. Eventually these will need to be flushed
393 * by calling stream_server_flush_enqueue_events () */
394 session_manager_main_t *smm = vnet_get_session_manager_main ();
395 u32 thread_index = s->thread_index;
396 u64 enqueue_epoch = smm->current_enqueue_epoch[tc->proto][thread_index];
398 if (s->enqueue_epoch != enqueue_epoch)
400 s->enqueue_epoch = enqueue_epoch;
401 vec_add1 (smm->session_to_enqueue[tc->proto][thread_index],
411 session_enqueue_dgram_connection (stream_session_t * s,
412 session_dgram_hdr_t * hdr,
413 vlib_buffer_t * b, u8 proto, u8 queue_event)
415 int enqueued = 0, rv, in_order_off;
417 ASSERT (svm_fifo_max_enqueue (s->server_rx_fifo)
418 >= b->current_length + sizeof (*hdr));
420 svm_fifo_enqueue_nowait (s->server_rx_fifo, sizeof (session_dgram_hdr_t),
422 enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length,
423 vlib_buffer_get_current (b));
424 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued >= 0))
426 in_order_off = enqueued > b->current_length ? enqueued : 0;
427 rv = session_enqueue_chain_tail (s, b, in_order_off, 1);
433 /* Queue RX event on this fifo. Eventually these will need to be flushed
434 * by calling stream_server_flush_enqueue_events () */
435 session_manager_main_t *smm = vnet_get_session_manager_main ();
436 u32 thread_index = s->thread_index;
437 u64 enqueue_epoch = smm->current_enqueue_epoch[proto][thread_index];
439 if (s->enqueue_epoch != enqueue_epoch)
441 s->enqueue_epoch = enqueue_epoch;
442 vec_add1 (smm->session_to_enqueue[proto][thread_index],
449 /** Check if we have space in rx fifo to push more bytes */
451 stream_session_no_space (transport_connection_t * tc, u32 thread_index,
454 stream_session_t *s = session_get (tc->s_index, thread_index);
456 if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY))
459 if (data_len > svm_fifo_max_enqueue (s->server_rx_fifo))
466 session_tx_fifo_max_dequeue (transport_connection_t * tc)
468 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
469 if (!s->server_tx_fifo)
471 return svm_fifo_max_dequeue (s->server_tx_fifo);
475 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
476 u32 offset, u32 max_bytes)
478 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
479 return svm_fifo_peek (s->server_tx_fifo, offset, max_bytes, buffer);
483 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes)
485 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
486 return svm_fifo_dequeue_drop (s->server_tx_fifo, max_bytes);
490 * Notify session peer that new data has been enqueued.
492 * @param s Stream session for which the event is to be generated.
493 * @param lock Flag to indicate if call should lock message queue.
495 * @return 0 on success or negative number if failed to send notification.
498 session_enqueue_notify (stream_session_t * s)
502 app = app_worker_get_if_valid (s->app_wrk_index);
503 if (PREDICT_FALSE (!app))
505 SESSION_DBG ("invalid s->app_index = %d", s->app_wrk_index);
510 SESSION_EVT_DBG(SESSION_EVT_ENQ, s, ({
511 ed->data[0] = FIFO_EVENT_APP_RX;
512 ed->data[1] = svm_fifo_max_dequeue (s->server_rx_fifo);
516 return app_worker_lock_and_send_event (app, s, FIFO_EVENT_APP_RX);
520 session_dequeue_notify (stream_session_t * s)
524 app = app_worker_get_if_valid (s->app_wrk_index);
525 if (PREDICT_FALSE (!app))
528 return app_worker_lock_and_send_event (app, s, FIFO_EVENT_APP_TX);
532 * Flushes queue of sessions that are to be notified of new data
535 * @param thread_index Thread index for which the flush is to be performed.
536 * @return 0 on success or a positive number indicating the number of
537 * failures due to API queue being full.
540 session_manager_flush_enqueue_events (u8 transport_proto, u32 thread_index)
542 session_manager_main_t *smm = &session_manager_main;
547 indices = smm->session_to_enqueue[transport_proto][thread_index];
549 for (i = 0; i < vec_len (indices); i++)
551 s = session_get_if_valid (indices[i], thread_index);
552 if (PREDICT_FALSE (!s))
557 if (PREDICT_FALSE (session_enqueue_notify (s)))
561 vec_reset_length (indices);
562 smm->session_to_enqueue[transport_proto][thread_index] = indices;
563 smm->current_enqueue_epoch[transport_proto][thread_index]++;
569 session_manager_flush_all_enqueue_events (u8 transport_proto)
571 vlib_thread_main_t *vtm = vlib_get_thread_main ();
573 for (i = 0; i < 1 + vtm->n_threads; i++)
574 errors += session_manager_flush_enqueue_events (transport_proto, i);
579 * Init fifo tail and head pointers
581 * Useful if transport uses absolute offsets for tracking ooo segments.
584 stream_session_init_fifos_pointers (transport_connection_t * tc,
585 u32 rx_pointer, u32 tx_pointer)
588 s = session_get (tc->s_index, tc->thread_index);
589 svm_fifo_init_pointers (s->server_rx_fifo, rx_pointer);
590 svm_fifo_init_pointers (s->server_tx_fifo, tx_pointer);
594 session_stream_connect_notify (transport_connection_t * tc, u8 is_fail)
596 u32 opaque = 0, new_ti, new_si;
597 stream_session_t *new_s = 0;
598 segment_manager_t *sm;
599 app_worker_t *app_wrk;
606 * Find connection handle and cleanup half-open table
608 handle = session_lookup_half_open_handle (tc);
609 if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE)
611 SESSION_DBG ("half-open was removed!");
614 session_lookup_del_half_open (tc);
616 /* Get the app's index from the handle we stored when opening connection
617 * and the opaque (api_context for external apps) from transport session
619 app_wrk = app_worker_get_if_valid (handle >> 32);
622 opaque = tc->s_index;
623 app = application_get (app_wrk->app_index);
626 * Allocate new session with fifos (svm segments are allocated if needed)
630 sm = app_worker_get_connect_segment_manager (app_wrk);
631 alloc_fifos = !application_is_builtin_proxy (app);
632 if (session_alloc_and_init (sm, tc, alloc_fifos, &new_s))
639 new_s->app_wrk_index = app_wrk->wrk_index;
640 new_si = new_s->session_index;
641 new_ti = new_s->thread_index;
646 * Notify client application
648 if (app->cb_fns.session_connected_callback (app_wrk->wrk_index, opaque,
651 SESSION_DBG ("failed to notify app");
654 new_s = session_get (new_si, new_ti);
655 stream_session_disconnect_transport (new_s);
662 new_s = session_get (new_si, new_ti);
663 new_s->session_state = SESSION_STATE_READY;
670 typedef struct _session_switch_pool_args
674 u32 new_thread_index;
675 u32 new_session_index;
676 } session_switch_pool_args_t;
679 session_switch_pool (void *cb_args)
681 session_switch_pool_args_t *args = (session_switch_pool_args_t *) cb_args;
682 transport_proto_t tp;
684 ASSERT (args->thread_index == vlib_get_thread_index ());
685 s = session_get (args->session_index, args->thread_index);
686 s->server_tx_fifo->master_session_index = args->new_session_index;
687 s->server_tx_fifo->master_thread_index = args->new_thread_index;
688 tp = session_get_transport_proto (s);
689 tp_vfts[tp].cleanup (s->connection_index, s->thread_index);
691 clib_mem_free (cb_args);
695 * Move dgram session to the right thread
698 session_dgram_connect_notify (transport_connection_t * tc,
699 u32 old_thread_index,
700 stream_session_t ** new_session)
702 stream_session_t *new_s;
703 session_switch_pool_args_t *rpc_args;
706 * Clone half-open session to the right thread.
708 new_s = session_clone_safe (tc->s_index, old_thread_index);
709 new_s->connection_index = tc->c_index;
710 new_s->server_rx_fifo->master_session_index = new_s->session_index;
711 new_s->server_rx_fifo->master_thread_index = new_s->thread_index;
712 new_s->session_state = SESSION_STATE_READY;
713 session_lookup_add_connection (tc, session_handle (new_s));
716 * Ask thread owning the old session to clean it up and make us the tx
719 rpc_args = clib_mem_alloc (sizeof (*rpc_args));
720 rpc_args->new_session_index = new_s->session_index;
721 rpc_args->new_thread_index = new_s->thread_index;
722 rpc_args->session_index = tc->s_index;
723 rpc_args->thread_index = old_thread_index;
724 session_send_rpc_evt_to_thread (rpc_args->thread_index, session_switch_pool,
727 tc->s_index = new_s->session_index;
728 new_s->connection_index = tc->c_index;
729 *new_session = new_s;
734 stream_session_accept_notify (transport_connection_t * tc)
736 app_worker_t *app_wrk;
740 s = session_get (tc->s_index, tc->thread_index);
741 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
744 app = application_get (app_wrk->app_index);
745 app->cb_fns.session_accept_callback (s);
749 * Notification from transport that connection is being closed.
751 * A disconnect is sent to application but state is not removed. Once
752 * disconnect is acknowledged by application, session disconnect is called.
753 * Ultimately this leads to close being called on transport (passive close).
756 stream_session_disconnect_notify (transport_connection_t * tc)
758 app_worker_t *app_wrk;
762 s = session_get (tc->s_index, tc->thread_index);
763 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
765 s->session_state = SESSION_STATE_TRANSPORT_CLOSING;
766 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
769 app = application_get (app_wrk->app_index);
770 app->cb_fns.session_disconnect_callback (s);
774 * Cleans up session and lookup table.
776 * Transport connection must still be valid.
779 stream_session_delete (stream_session_t * s)
783 /* Delete from the main lookup table. */
784 if ((rv = session_lookup_del_session (s)))
785 clib_warning ("hash delete error, rv %d", rv);
787 session_free_w_fifos (s);
791 * Notification from transport that connection is being deleted
793 * This removes the session if it is still valid. It should be called only on
794 * previously fully established sessions. For instance failed connects should
795 * call stream_session_connect_notify and indicate that the connect has
799 stream_session_delete_notify (transport_connection_t * tc)
803 /* App might've been removed already */
804 if (!(s = session_get_if_valid (tc->s_index, tc->thread_index)))
807 /* Make sure we don't try to send anything more */
808 svm_fifo_dequeue_drop_all (s->server_tx_fifo);
810 switch (s->session_state)
812 case SESSION_STATE_TRANSPORT_CLOSING:
813 /* If transport finishes or times out before we get a reply
814 * from the app, do the whole disconnect since we might still
815 * have lingering events */
816 stream_session_disconnect (s);
818 case SESSION_STATE_CLOSING:
819 /* Cleanup lookup table. Transport needs to still be valid */
820 session_lookup_del_session (s);
822 case SESSION_STATE_CLOSED:
823 case SESSION_STATE_ACCEPTING:
824 stream_session_delete (s);
828 s->session_state = SESSION_STATE_CLOSED;
832 * Notify application that connection has been reset.
835 stream_session_reset_notify (transport_connection_t * tc)
838 app_worker_t *app_wrk;
840 s = session_get (tc->s_index, tc->thread_index);
841 s->session_state = SESSION_STATE_CLOSED;
842 app_wrk = app_worker_get (s->app_wrk_index);
843 app = application_get (app_wrk->app_index);
844 app->cb_fns.session_reset_callback (s);
848 * Accept a stream session. Optionally ping the server by callback.
851 stream_session_accept (transport_connection_t * tc, u32 listener_index,
854 stream_session_t *s, *listener;
855 app_worker_t *app_wrk;
856 segment_manager_t *sm;
859 /* Find the server */
860 listener = listen_session_get (listener_index);
861 app_wrk = application_listener_select_worker (listener, 0);
863 sm = app_worker_get_listen_segment_manager (app_wrk, listener);
864 if ((rv = session_alloc_and_init (sm, tc, 1, &s)))
867 s->app_wrk_index = app_wrk->wrk_index;
868 s->listener_index = listener_index;
869 s->session_state = SESSION_STATE_ACCEPTING;
871 /* Shoulder-tap the server */
874 application_t *app = application_get (app_wrk->app_index);
875 app->cb_fns.session_accept_callback (s);
882 session_open_cl (u32 app_wrk_index, session_endpoint_t * rmt, u32 opaque)
884 transport_connection_t *tc;
885 transport_endpoint_t *tep;
886 segment_manager_t *sm;
887 app_worker_t *app_wrk;
892 tep = session_endpoint_to_transport (rmt);
893 rv = tp_vfts[rmt->transport_proto].open (tep);
896 SESSION_DBG ("Transport failed to open connection.");
897 return VNET_API_ERROR_SESSION_CONNECT;
900 tc = tp_vfts[rmt->transport_proto].get_half_open ((u32) rv);
902 /* For dgram type of service, allocate session and fifos now.
904 app_wrk = app_worker_get (app_wrk_index);
905 sm = app_worker_get_connect_segment_manager (app_wrk);
907 if (session_alloc_and_init (sm, tc, 1, &s))
909 s->app_wrk_index = app_wrk->wrk_index;
910 s->session_state = SESSION_STATE_OPENED;
912 /* Tell the app about the new event fifo for this session */
913 app = application_get (app_wrk->app_index);
914 app->cb_fns.session_connected_callback (app_wrk->wrk_index, opaque, s, 0);
920 session_open_vc (u32 app_wrk_index, session_endpoint_t * rmt, u32 opaque)
922 transport_connection_t *tc;
923 transport_endpoint_t *tep;
927 tep = session_endpoint_to_transport (rmt);
928 rv = tp_vfts[rmt->transport_proto].open (tep);
931 SESSION_DBG ("Transport failed to open connection.");
932 return VNET_API_ERROR_SESSION_CONNECT;
935 tc = tp_vfts[rmt->transport_proto].get_half_open ((u32) rv);
937 /* If transport offers a stream service, only allocate session once the
938 * connection has been established.
939 * Add connection to half-open table and save app and tc index. The
940 * latter is needed to help establish the connection while the former
941 * is needed when the connect notify comes and we have to notify the
944 handle = (((u64) app_wrk_index) << 32) | (u64) tc->c_index;
945 session_lookup_add_half_open (tc, handle);
947 /* Store api_context (opaque) for when the reply comes. Not the nicest
948 * thing but better than allocating a separate half-open pool.
950 tc->s_index = opaque;
955 session_open_app (u32 app_wrk_index, session_endpoint_t * rmt, u32 opaque)
957 session_endpoint_extended_t *sep = (session_endpoint_extended_t *) rmt;
958 sep->app_wrk_index = app_wrk_index;
959 sep->opaque = opaque;
961 return tp_vfts[rmt->transport_proto].open ((transport_endpoint_t *) sep);
964 typedef int (*session_open_service_fn) (u32, session_endpoint_t *, u32);
967 static session_open_service_fn session_open_srv_fns[TRANSPORT_N_SERVICES] = {
975 * Ask transport to open connection to remote transport endpoint.
977 * Stores handle for matching request with reply since the call can be
978 * asynchronous. For instance, for TCP the 3-way handshake must complete
979 * before reply comes. Session is only created once connection is established.
981 * @param app_index Index of the application requesting the connect
982 * @param st Session type requested.
983 * @param tep Remote transport endpoint
984 * @param opaque Opaque data (typically, api_context) the application expects
985 * on open completion.
988 session_open (u32 app_wrk_index, session_endpoint_t * rmt, u32 opaque)
990 transport_service_type_t tst = tp_vfts[rmt->transport_proto].service_type;
991 return session_open_srv_fns[tst] (app_wrk_index, rmt, opaque);
995 * Ask transport to listen on session endpoint.
997 * @param s Session for which listen will be called. Note that unlike
998 * established sessions, listen sessions are not associated to a
1000 * @param sep Local endpoint to be listened on.
1003 session_listen (stream_session_t * ls, session_endpoint_extended_t * sep)
1005 transport_connection_t *tc;
1006 transport_endpoint_t *tep;
1007 u32 tc_index, s_index;
1009 /* Transport bind/listen */
1010 tep = session_endpoint_to_transport (sep);
1011 s_index = ls->session_index;
1012 tc_index = tp_vfts[sep->transport_proto].bind (s_index, tep);
1014 if (tc_index == (u32) ~ 0)
1017 /* Attach transport to session */
1018 ls = listen_session_get (s_index);
1019 ls->connection_index = tc_index;
1021 /* Add to the main lookup table after transport was initialized */
1022 tc = tp_vfts[sep->transport_proto].get_listener (tc_index);
1023 session_lookup_add_connection (tc, s_index);
1028 * Ask transport to stop listening on local transport endpoint.
1030 * @param s Session to stop listening on. It must be in state LISTENING.
1033 session_stop_listen (stream_session_t * s)
1035 transport_proto_t tp = session_get_transport_proto (s);
1036 transport_connection_t *tc;
1037 if (s->session_state != SESSION_STATE_LISTENING)
1039 clib_warning ("not a listening session");
1043 tc = tp_vfts[tp].get_listener (s->connection_index);
1046 clib_warning ("no transport");
1047 return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
1050 session_lookup_del_connection (tc);
1051 tp_vfts[tp].unbind (s->connection_index);
1056 * Initialize session disconnect.
1058 * Request is always sent to session node to ensure that all outstanding
1059 * requests are served before transport is notified.
1062 stream_session_disconnect (stream_session_t * s)
1064 u32 thread_index = vlib_get_thread_index ();
1065 session_manager_main_t *smm = &session_manager_main;
1066 session_event_t *evt;
1071 if (s->session_state >= SESSION_STATE_CLOSING)
1073 /* Session already closed. Clear the tx fifo */
1074 if (s->session_state == SESSION_STATE_CLOSED)
1075 svm_fifo_dequeue_drop_all (s->server_tx_fifo);
1079 s->session_state = SESSION_STATE_CLOSING;
1081 /* If we are in the handler thread, or being called with the worker barrier
1082 * held, just append a new event to pending disconnects vector. */
1083 if (vlib_thread_is_main_w_barrier () || thread_index == s->thread_index)
1085 vec_add2 (smm->pending_disconnects[s->thread_index], evt, 1);
1086 memset (evt, 0, sizeof (*evt));
1087 evt->session_handle = session_handle (s);
1088 evt->event_type = FIFO_EVENT_DISCONNECT;
1091 session_send_ctrl_evt_to_thread (s, FIFO_EVENT_DISCONNECT);
1095 * Notify transport the session can be disconnected. This should eventually
1096 * result in a delete notification that allows us to cleanup session state.
1097 * Called for both active/passive disconnects.
1099 * Must be called from the session's thread.
1102 stream_session_disconnect_transport (stream_session_t * s)
1104 /* If transport is already closed, just free the session */
1105 if (s->session_state == SESSION_STATE_CLOSED)
1107 session_free_w_fifos (s);
1110 s->session_state = SESSION_STATE_CLOSED;
1111 tp_vfts[session_get_transport_proto (s)].close (s->connection_index,
1116 * Cleanup transport and session state.
1118 * Notify transport of the cleanup and free the session. This should
1119 * be called only if transport reported some error and is already
1123 stream_session_cleanup (stream_session_t * s)
1125 s->session_state = SESSION_STATE_CLOSED;
1127 /* Delete from main lookup table before we axe the the transport */
1128 session_lookup_del_session (s);
1129 tp_vfts[session_get_transport_proto (s)].cleanup (s->connection_index,
1131 /* Since we called cleanup, no delete notification will come. So, make
1132 * sure the session is properly freed. */
1133 session_free_w_fifos (s);
1136 transport_service_type_t
1137 session_transport_service_type (stream_session_t * s)
1139 transport_proto_t tp;
1140 tp = session_get_transport_proto (s);
1141 return transport_protocol_service_type (tp);
1144 transport_tx_fn_type_t
1145 session_transport_tx_fn_type (stream_session_t * s)
1147 transport_proto_t tp;
1148 tp = session_get_transport_proto (s);
1149 return transport_protocol_tx_fn_type (tp);
1153 session_tx_is_dgram (stream_session_t * s)
1155 return (session_transport_tx_fn_type (s) == TRANSPORT_TX_DGRAM);
1159 * Allocate event queues in the shared-memory segment
1161 * That can either be a newly created memfd segment, that will need to be
1162 * mapped by all stack users, or the binary api's svm region. The latter is
1163 * assumed to be already mapped. NOTE that this assumption DOES NOT hold if
1164 * api clients bootstrap shm api over sockets (i.e. use memfd segments) and
1165 * vpp uses api svm region for event queues.
1168 session_vpp_event_queues_allocate (session_manager_main_t * smm)
1170 u32 evt_q_length = 2048, evt_size = sizeof (session_event_t);
1171 ssvm_private_t *eqs = &smm->evt_qs_segment;
1172 api_main_t *am = &api_main;
1173 u64 eqs_size = 64 << 20;
1174 pid_t vpp_pid = getpid ();
1178 if (smm->configured_event_queue_length)
1179 evt_q_length = smm->configured_event_queue_length;
1181 if (smm->evt_qs_use_memfd_seg)
1183 if (smm->evt_qs_segment_size)
1184 eqs_size = smm->evt_qs_segment_size;
1186 eqs->ssvm_size = eqs_size;
1187 eqs->i_am_master = 1;
1188 eqs->my_pid = vpp_pid;
1189 eqs->name = format (0, "%s%c", "evt-qs-segment", 0);
1190 eqs->requested_va = smm->session_baseva;
1192 if (ssvm_master_init (eqs, SSVM_SEGMENT_MEMFD))
1194 clib_warning ("failed to initialize queue segment");
1199 if (smm->evt_qs_use_memfd_seg)
1200 oldheap = ssvm_push_heap (eqs->sh);
1202 oldheap = svm_push_data_heap (am->vlib_rp);
1204 for (i = 0; i < vec_len (smm->vpp_event_queues); i++)
1206 svm_msg_q_cfg_t _cfg, *cfg = &_cfg;
1207 u32 notif_q_size = clib_max (16, evt_q_length >> 4);
1208 svm_msg_q_ring_cfg_t rc[SESSION_MQ_N_RINGS] = {
1209 {evt_q_length, evt_size, 0}
1211 {notif_q_size, 256, 0}
1213 cfg->consumer_pid = 0;
1215 cfg->q_nitems = evt_q_length;
1216 cfg->ring_cfgs = rc;
1217 smm->vpp_event_queues[i] = svm_msg_q_alloc (cfg);
1218 if (smm->evt_qs_use_memfd_seg)
1220 if (svm_msg_q_alloc_consumer_eventfd (smm->vpp_event_queues[i]))
1221 clib_warning ("eventfd returned");
1225 if (smm->evt_qs_use_memfd_seg)
1226 ssvm_pop_heap (oldheap);
1228 svm_pop_heap (oldheap);
1232 session_manager_get_evt_q_segment (void)
1234 session_manager_main_t *smm = &session_manager_main;
1235 if (smm->evt_qs_use_memfd_seg)
1236 return &smm->evt_qs_segment;
1241 static session_fifo_rx_fn *session_tx_fns[TRANSPORT_TX_N_FNS] = {
1242 session_tx_fifo_peek_and_snd,
1243 session_tx_fifo_dequeue_and_snd,
1244 session_tx_fifo_dequeue_internal,
1245 session_tx_fifo_dequeue_and_snd
1250 * Initialize session layer for given transport proto and ip version
1252 * Allocates per session type (transport proto + ip version) data structures
1253 * and adds arc from session queue node to session type output node.
1256 session_register_transport (transport_proto_t transport_proto,
1257 const transport_proto_vft_t * vft, u8 is_ip4,
1260 session_manager_main_t *smm = &session_manager_main;
1261 session_type_t session_type;
1262 u32 next_index = ~0;
1264 session_type = session_type_from_proto_and_ip (transport_proto, is_ip4);
1266 vec_validate (smm->session_type_to_next, session_type);
1267 vec_validate (smm->session_tx_fns, session_type);
1270 if (output_node != ~0)
1272 foreach_vlib_main (({
1273 next_index = vlib_node_add_next (this_vlib_main,
1274 session_queue_node.index,
1280 smm->session_type_to_next[session_type] = next_index;
1281 smm->session_tx_fns[session_type] = session_tx_fns[vft->tx_type];
1284 transport_connection_t *
1285 session_get_transport (stream_session_t * s)
1287 transport_proto_t tp;
1288 if (s->session_state != SESSION_STATE_LISTENING)
1290 tp = session_get_transport_proto (s);
1291 return tp_vfts[tp].get_connection (s->connection_index,
1297 transport_connection_t *
1298 listen_session_get_transport (stream_session_t * s)
1300 transport_proto_t tp = session_get_transport_proto (s);
1301 return tp_vfts[tp].get_listener (s->connection_index);
1305 listen_session_get_local_session_endpoint (stream_session_t * listener,
1306 session_endpoint_t * sep)
1308 transport_proto_t tp = session_get_transport_proto (listener);
1309 transport_connection_t *tc;
1310 tc = tp_vfts[tp].get_listener (listener->connection_index);
1313 clib_warning ("no transport");
1317 /* N.B. The ip should not be copied because this is the local endpoint */
1318 sep->port = tc->lcl_port;
1319 sep->transport_proto = tc->proto;
1320 sep->is_ip4 = tc->is_ip4;
1325 session_flush_frames_main_thread (vlib_main_t * vm)
1327 ASSERT (vlib_get_thread_index () == 0);
1328 vlib_process_signal_event_mt (vm, session_queue_process_node.index,
1329 SESSION_Q_PROCESS_FLUSH_FRAMES, 0);
1332 static clib_error_t *
1333 session_manager_main_enable (vlib_main_t * vm)
1335 segment_manager_main_init_args_t _sm_args = { 0 }, *sm_args = &_sm_args;
1336 session_manager_main_t *smm = &session_manager_main;
1337 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1338 u32 num_threads, preallocated_sessions_per_worker;
1341 num_threads = 1 /* main thread */ + vtm->n_threads;
1343 if (num_threads < 1)
1344 return clib_error_return (0, "n_thread_stacks not set");
1346 /* configure per-thread ** vectors */
1347 vec_validate (smm->sessions, num_threads - 1);
1348 vec_validate (smm->tx_buffers, num_threads - 1);
1349 vec_validate (smm->pending_event_vector, num_threads - 1);
1350 vec_validate (smm->pending_disconnects, num_threads - 1);
1351 vec_validate (smm->free_event_vector, num_threads - 1);
1352 vec_validate (smm->vpp_event_queues, num_threads - 1);
1353 vec_validate (smm->peekers_rw_locks, num_threads - 1);
1354 vec_validate_aligned (smm->ctx, num_threads - 1, CLIB_CACHE_LINE_BYTES);
1356 for (i = 0; i < TRANSPORT_N_PROTO; i++)
1358 vec_validate (smm->current_enqueue_epoch[i], num_threads - 1);
1359 vec_validate (smm->session_to_enqueue[i], num_threads - 1);
1360 for (j = 0; j < num_threads; j++)
1361 smm->current_enqueue_epoch[i][j] = 1;
1364 for (i = 0; i < num_threads; i++)
1366 vec_validate (smm->free_event_vector[i], 0);
1367 _vec_len (smm->free_event_vector[i]) = 0;
1368 vec_validate (smm->pending_event_vector[i], 0);
1369 _vec_len (smm->pending_event_vector[i]) = 0;
1370 vec_validate (smm->pending_disconnects[i], 0);
1371 _vec_len (smm->pending_disconnects[i]) = 0;
1372 if (num_threads > 1)
1373 clib_rwlock_init (&smm->peekers_rw_locks[i]);
1377 vec_validate (smm->last_event_poll_by_thread, num_threads - 1);
1380 /* Allocate vpp event queues segment and queue */
1381 session_vpp_event_queues_allocate (smm);
1383 /* Initialize fifo segment main baseva and timeout */
1384 sm_args->baseva = smm->session_baseva + smm->evt_qs_segment_size;
1385 sm_args->size = smm->session_va_space_size;
1386 segment_manager_main_init (sm_args);
1388 /* Preallocate sessions */
1389 if (smm->preallocated_sessions)
1391 if (num_threads == 1)
1393 pool_init_fixed (smm->sessions[0], smm->preallocated_sessions);
1398 preallocated_sessions_per_worker =
1399 (1.1 * (f64) smm->preallocated_sessions /
1400 (f64) (num_threads - 1));
1402 for (j = 1; j < num_threads; j++)
1404 pool_init_fixed (smm->sessions[j],
1405 preallocated_sessions_per_worker);
1410 session_lookup_init ();
1411 app_namespaces_init ();
1414 smm->is_enabled = 1;
1416 /* Enable transports */
1417 transport_enable_disable (vm, 1);
1423 session_node_enable_disable (u8 is_en)
1425 u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED;
1426 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1427 u8 have_workers = vtm->n_threads != 0;
1430 foreach_vlib_main (({
1431 if (have_workers && ii == 0)
1433 vlib_node_set_state (this_vlib_main, session_queue_process_node.index,
1437 vlib_node_t *n = vlib_get_node (this_vlib_main,
1438 session_queue_process_node.index);
1439 vlib_start_process (this_vlib_main, n->runtime_index);
1443 vlib_process_signal_event_mt (this_vlib_main,
1444 session_queue_process_node.index,
1445 SESSION_Q_PROCESS_STOP, 0);
1450 vlib_node_set_state (this_vlib_main, session_queue_node.index,
1457 vnet_session_enable_disable (vlib_main_t * vm, u8 is_en)
1459 clib_error_t *error = 0;
1462 if (session_manager_main.is_enabled)
1465 session_node_enable_disable (is_en);
1466 error = session_manager_main_enable (vm);
1470 session_manager_main.is_enabled = 0;
1471 session_node_enable_disable (is_en);
1478 session_manager_main_init (vlib_main_t * vm)
1480 session_manager_main_t *smm = &session_manager_main;
1481 smm->session_baseva = 0x200000000ULL;
1482 smm->session_va_space_size = (u64) 128 << 30;
1483 smm->evt_qs_segment_size = 64 << 20;
1484 smm->is_enabled = 0;
1488 VLIB_INIT_FUNCTION (session_manager_main_init);
1490 static clib_error_t *
1491 session_config_fn (vlib_main_t * vm, unformat_input_t * input)
1493 session_manager_main_t *smm = &session_manager_main;
1497 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1499 if (unformat (input, "event-queue-length %d", &nitems))
1502 smm->configured_event_queue_length = nitems;
1504 clib_warning ("event queue length %d too small, ignored", nitems);
1506 else if (unformat (input, "preallocated-sessions %d",
1507 &smm->preallocated_sessions))
1509 else if (unformat (input, "v4-session-table-buckets %d",
1510 &smm->configured_v4_session_table_buckets))
1512 else if (unformat (input, "v4-halfopen-table-buckets %d",
1513 &smm->configured_v4_halfopen_table_buckets))
1515 else if (unformat (input, "v6-session-table-buckets %d",
1516 &smm->configured_v6_session_table_buckets))
1518 else if (unformat (input, "v6-halfopen-table-buckets %d",
1519 &smm->configured_v6_halfopen_table_buckets))
1521 else if (unformat (input, "v4-session-table-memory %U",
1522 unformat_memory_size, &tmp))
1524 if (tmp >= 0x100000000)
1525 return clib_error_return (0, "memory size %llx (%lld) too large",
1527 smm->configured_v4_session_table_memory = tmp;
1529 else if (unformat (input, "v4-halfopen-table-memory %U",
1530 unformat_memory_size, &tmp))
1532 if (tmp >= 0x100000000)
1533 return clib_error_return (0, "memory size %llx (%lld) too large",
1535 smm->configured_v4_halfopen_table_memory = tmp;
1537 else if (unformat (input, "v6-session-table-memory %U",
1538 unformat_memory_size, &tmp))
1540 if (tmp >= 0x100000000)
1541 return clib_error_return (0, "memory size %llx (%lld) too large",
1543 smm->configured_v6_session_table_memory = tmp;
1545 else if (unformat (input, "v6-halfopen-table-memory %U",
1546 unformat_memory_size, &tmp))
1548 if (tmp >= 0x100000000)
1549 return clib_error_return (0, "memory size %llx (%lld) too large",
1551 smm->configured_v6_halfopen_table_memory = tmp;
1553 else if (unformat (input, "local-endpoints-table-memory %U",
1554 unformat_memory_size, &tmp))
1556 if (tmp >= 0x100000000)
1557 return clib_error_return (0, "memory size %llx (%lld) too large",
1559 smm->local_endpoints_table_memory = tmp;
1561 else if (unformat (input, "local-endpoints-table-buckets %d",
1562 &smm->local_endpoints_table_buckets))
1564 else if (unformat (input, "evt_qs_memfd_seg"))
1565 smm->evt_qs_use_memfd_seg = 1;
1567 return clib_error_return (0, "unknown input `%U'",
1568 format_unformat_error, input);
1573 VLIB_CONFIG_FUNCTION (session_config_fn, "session");
1576 * fd.io coding-style-patch-verification: ON
1579 * eval: (c-set-style "gnu")