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>
26 #include <vnet/tcp/tcp.h>
28 session_manager_main_t session_manager_main;
29 extern transport_proto_vft_t *tp_vfts;
32 session_send_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type,
33 u32 thread_index, void *fp, void *rpc_args)
36 session_fifo_event_t evt = { {0}, };
37 unix_shared_memory_queue_t *q;
39 evt.event_type = evt_type;
40 if (evt_type == FIFO_EVENT_RPC)
43 evt.rpc_args.arg = rpc_args;
46 evt.session_handle = session_handle;
48 q = session_manager_get_vpp_event_queue (thread_index);
49 while (unix_shared_memory_queue_add (q, (u8 *) & evt, 1))
53 SESSION_DBG ("failed to enqueue evt");
60 session_send_session_evt_to_thread (u64 session_handle,
61 fifo_event_type_t evt_type,
64 session_send_evt_to_thread (session_handle, evt_type, thread_index, 0, 0);
68 session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
70 if (thread_index != vlib_get_thread_index ())
71 session_send_evt_to_thread (0, FIFO_EVENT_RPC, thread_index, fp,
75 void (*fnp) (void *) = fp;
81 session_alloc (u32 thread_index)
83 session_manager_main_t *smm = &session_manager_main;
86 pool_get_aligned_will_expand (smm->sessions[thread_index], will_expand,
87 CLIB_CACHE_LINE_BYTES);
88 /* If we have peekers, let them finish */
89 if (PREDICT_FALSE (will_expand))
91 clib_spinlock_lock_if_init (&smm->peekers_write_locks[thread_index]);
92 pool_get_aligned (session_manager_main.sessions[thread_index], s,
93 CLIB_CACHE_LINE_BYTES);
94 clib_spinlock_unlock_if_init (&smm->peekers_write_locks[thread_index]);
98 pool_get_aligned (session_manager_main.sessions[thread_index], s,
99 CLIB_CACHE_LINE_BYTES);
101 memset (s, 0, sizeof (*s));
102 s->session_index = s - session_manager_main.sessions[thread_index];
103 s->thread_index = thread_index;
108 session_free (stream_session_t * s)
110 pool_put (session_manager_main.sessions[s->thread_index], s);
112 memset (s, 0xFA, sizeof (*s));
116 session_alloc_fifos (segment_manager_t * sm, stream_session_t * s)
118 svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0;
119 u32 fifo_segment_index;
122 if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo,
124 &fifo_segment_index)))
126 /* Initialize backpointers */
127 server_rx_fifo->master_session_index = s->session_index;
128 server_rx_fifo->master_thread_index = s->thread_index;
130 server_tx_fifo->master_session_index = s->session_index;
131 server_tx_fifo->master_thread_index = s->thread_index;
133 s->server_rx_fifo = server_rx_fifo;
134 s->server_tx_fifo = server_tx_fifo;
135 s->svm_segment_index = fifo_segment_index;
139 static stream_session_t *
140 session_alloc_for_connection (transport_connection_t * tc)
143 u32 thread_index = tc->thread_index;
145 ASSERT (thread_index == vlib_get_thread_index ());
147 s = session_alloc (thread_index);
148 s->session_type = session_type_from_proto_and_ip (tc->proto, tc->is_ip4);
149 s->session_state = SESSION_STATE_CONNECTING;
151 /* Attach transport to session and vice versa */
152 s->connection_index = tc->c_index;
153 tc->s_index = s->session_index;
158 session_alloc_and_init (segment_manager_t * sm, transport_connection_t * tc,
159 u8 alloc_fifos, stream_session_t ** ret_s)
164 s = session_alloc_for_connection (tc);
165 if (alloc_fifos && (rv = session_alloc_fifos (sm, s)))
172 /* Add to the main lookup table */
173 session_lookup_add_connection (tc, session_handle (s));
180 * Discards bytes from buffer chain
182 * It discards n_bytes_to_drop starting at first buffer after chain_b
185 session_enqueue_discard_chain_bytes (vlib_main_t * vm, vlib_buffer_t * b,
186 vlib_buffer_t ** chain_b,
189 vlib_buffer_t *next = *chain_b;
190 u32 to_drop = n_bytes_to_drop;
191 ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
192 while (to_drop && (next->flags & VLIB_BUFFER_NEXT_PRESENT))
194 next = vlib_get_buffer (vm, next->next_buffer);
195 if (next->current_length > to_drop)
197 vlib_buffer_advance (next, to_drop);
202 to_drop -= next->current_length;
203 next->current_length = 0;
209 b->total_length_not_including_first_buffer -= n_bytes_to_drop;
213 * Enqueue buffer chain tail
216 session_enqueue_chain_tail (stream_session_t * s, vlib_buffer_t * b,
217 u32 offset, u8 is_in_order)
219 vlib_buffer_t *chain_b;
220 u32 chain_bi, len, diff;
221 vlib_main_t *vm = vlib_get_main ();
226 if (is_in_order && offset)
228 diff = offset - b->current_length;
229 if (diff > b->total_length_not_including_first_buffer)
232 session_enqueue_discard_chain_bytes (vm, b, &chain_b, diff);
233 chain_bi = vlib_get_buffer_index (vm, chain_b);
236 chain_bi = b->next_buffer;
240 chain_b = vlib_get_buffer (vm, chain_bi);
241 data = vlib_buffer_get_current (chain_b);
242 len = chain_b->current_length;
247 rv = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data);
254 return (rv > 0) ? (written + rv) : written;
260 /* written more than what was left in chain */
261 if (written > b->total_length_not_including_first_buffer)
264 /* drop the bytes that have already been delivered */
265 session_enqueue_discard_chain_bytes (vm, b, &chain_b, rv - len);
270 rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, len,
274 clib_warning ("failed to enqueue multi-buffer seg");
280 while ((chain_bi = (chain_b->flags & VLIB_BUFFER_NEXT_PRESENT)
281 ? chain_b->next_buffer : 0));
290 * Enqueue data for delivery to session peer. Does not notify peer of enqueue
291 * event but on request can queue notification events for later delivery by
292 * calling stream_server_flush_enqueue_events().
294 * @param tc Transport connection which is to be enqueued data
295 * @param b Buffer to be enqueued
296 * @param offset Offset at which to start enqueueing if out-of-order
297 * @param queue_event Flag to indicate if peer is to be notified or if event
298 * is to be queued. The former is useful when more data is
299 * enqueued and only one event is to be generated.
300 * @param is_in_order Flag to indicate if data is in order
301 * @return Number of bytes enqueued or a negative value if enqueueing failed.
304 session_enqueue_stream_connection (transport_connection_t * tc,
305 vlib_buffer_t * b, u32 offset,
306 u8 queue_event, u8 is_in_order)
309 int enqueued = 0, rv, in_order_off;
311 s = session_get (tc->s_index, tc->thread_index);
315 enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo,
317 vlib_buffer_get_current (b));
318 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT)
321 in_order_off = enqueued > b->current_length ? enqueued : 0;
322 rv = session_enqueue_chain_tail (s, b, in_order_off, 1);
329 rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset,
331 vlib_buffer_get_current (b));
332 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv))
333 session_enqueue_chain_tail (s, b, offset + b->current_length, 0);
334 /* if something was enqueued, report even this as success for ooo
335 * segment handling */
341 /* Queue RX event on this fifo. Eventually these will need to be flushed
342 * by calling stream_server_flush_enqueue_events () */
343 session_manager_main_t *smm = vnet_get_session_manager_main ();
344 u32 thread_index = s->thread_index;
345 u32 enqueue_epoch = smm->current_enqueue_epoch[tc->proto][thread_index];
347 if (s->enqueue_epoch != enqueue_epoch)
349 s->enqueue_epoch = enqueue_epoch;
350 vec_add1 (smm->session_to_enqueue[tc->proto][thread_index],
351 s - smm->sessions[thread_index]);
359 session_enqueue_dgram_connection (stream_session_t * s, vlib_buffer_t * b,
360 u8 proto, u8 queue_event)
362 int enqueued = 0, rv, in_order_off;
364 if (svm_fifo_max_enqueue (s->server_rx_fifo) < b->current_length)
366 enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length,
367 vlib_buffer_get_current (b));
368 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued >= 0))
370 in_order_off = enqueued > b->current_length ? enqueued : 0;
371 rv = session_enqueue_chain_tail (s, b, in_order_off, 1);
377 /* Queue RX event on this fifo. Eventually these will need to be flushed
378 * by calling stream_server_flush_enqueue_events () */
379 session_manager_main_t *smm = vnet_get_session_manager_main ();
380 u32 thread_index = s->thread_index;
381 u32 enqueue_epoch = smm->current_enqueue_epoch[proto][thread_index];
383 if (s->enqueue_epoch != enqueue_epoch)
385 s->enqueue_epoch = enqueue_epoch;
386 vec_add1 (smm->session_to_enqueue[proto][thread_index],
387 s - smm->sessions[thread_index]);
393 /** Check if we have space in rx fifo to push more bytes */
395 stream_session_no_space (transport_connection_t * tc, u32 thread_index,
398 stream_session_t *s = session_get (tc->s_index, thread_index);
400 if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY))
403 if (data_len > svm_fifo_max_enqueue (s->server_rx_fifo))
410 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc)
412 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
413 if (!s->server_tx_fifo)
415 return svm_fifo_max_dequeue (s->server_tx_fifo);
419 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
420 u32 offset, u32 max_bytes)
422 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
423 return svm_fifo_peek (s->server_tx_fifo, offset, max_bytes, buffer);
427 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes)
429 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
430 return svm_fifo_dequeue_drop (s->server_tx_fifo, max_bytes);
434 * Notify session peer that new data has been enqueued.
436 * @param s Stream session for which the event is to be generated.
437 * @param block Flag to indicate if call should block if event queue is full.
439 * @return 0 on succes or negative number if failed to send notification.
442 session_enqueue_notify (stream_session_t * s, u8 block)
445 session_fifo_event_t evt;
446 unix_shared_memory_queue_t *q;
448 if (PREDICT_FALSE (s->session_state == SESSION_STATE_CLOSED))
450 /* Session is closed so app will never clean up. Flush rx fifo */
451 u32 to_dequeue = svm_fifo_max_dequeue (s->server_rx_fifo);
453 svm_fifo_dequeue_drop (s->server_rx_fifo, to_dequeue);
457 /* Get session's server */
458 app = application_get_if_valid (s->app_index);
460 if (PREDICT_FALSE (app == 0))
462 clib_warning ("invalid s->app_index = %d", s->app_index);
466 /* Built-in server? Hand event to the callback... */
467 if (app->cb_fns.builtin_server_rx_callback)
468 return app->cb_fns.builtin_server_rx_callback (s);
470 /* If no event, send one */
471 if (svm_fifo_set_event (s->server_rx_fifo))
473 /* Fabricate event */
474 evt.fifo = s->server_rx_fifo;
475 evt.event_type = FIFO_EVENT_APP_RX;
477 /* Add event to server's event queue */
478 q = app->event_queue;
480 /* Based on request block (or not) for lack of space */
481 if (block || PREDICT_TRUE (q->cursize < q->maxsize))
482 unix_shared_memory_queue_add (app->event_queue, (u8 *) & evt,
483 0 /* do wait for mutex */ );
486 clib_warning ("fifo full");
492 SESSION_EVT_DBG(SESSION_EVT_ENQ, s, ({
493 ed->data[0] = evt.event_type;
494 ed->data[1] = svm_fifo_max_dequeue (s->server_rx_fifo);
502 * Flushes queue of sessions that are to be notified of new data
505 * @param thread_index Thread index for which the flush is to be performed.
506 * @return 0 on success or a positive number indicating the number of
507 * failures due to API queue being full.
510 session_manager_flush_enqueue_events (u8 transport_proto, u32 thread_index)
512 session_manager_main_t *smm = &session_manager_main;
517 indices = smm->session_to_enqueue[transport_proto][thread_index];
519 for (i = 0; i < vec_len (indices); i++)
521 s = session_get_if_valid (indices[i], thread_index);
522 if (s == 0 || session_enqueue_notify (s, 0 /* don't block */ ))
526 vec_reset_length (indices);
527 smm->session_to_enqueue[transport_proto][thread_index] = indices;
528 smm->current_enqueue_epoch[transport_proto][thread_index]++;
534 * Init fifo tail and head pointers
536 * Useful if transport uses absolute offsets for tracking ooo segments.
539 stream_session_init_fifos_pointers (transport_connection_t * tc,
540 u32 rx_pointer, u32 tx_pointer)
543 s = session_get (tc->s_index, tc->thread_index);
544 svm_fifo_init_pointers (s->server_rx_fifo, rx_pointer);
545 svm_fifo_init_pointers (s->server_tx_fifo, tx_pointer);
549 session_stream_connect_notify (transport_connection_t * tc, u8 is_fail)
552 stream_session_t *new_s = 0;
556 segment_manager_t *sm;
560 * Find connection handle and cleanup half-open table
562 handle = session_lookup_half_open_handle (tc);
563 if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE)
565 SESSION_DBG ("half-open was removed!");
568 session_lookup_del_half_open (tc);
570 /* Get the app's index from the handle we stored when opening connection
571 * and the opaque (api_context for external apps) from transport session
573 app = application_get_if_valid (handle >> 32);
576 opaque = tc->s_index;
579 * Allocate new session with fifos (svm segments are allocated if needed)
583 sm = application_get_connect_segment_manager (app);
584 alloc_fifos = !application_is_builtin_proxy (app);
585 if (session_alloc_and_init (sm, tc, alloc_fifos, &new_s))
591 new_s->app_index = app->index;
595 * Notify client application
597 if (app->cb_fns.session_connected_callback (app->index, opaque, new_s,
600 SESSION_DBG ("failed to notify app");
602 stream_session_disconnect (new_s);
607 new_s->session_state = SESSION_STATE_READY;
613 typedef struct _session_switch_pool_args
617 u32 new_thread_index;
618 u32 new_session_index;
619 } session_switch_pool_args_t;
622 session_switch_pool (void *cb_args)
624 session_switch_pool_args_t *args = (session_switch_pool_args_t *) cb_args;
626 ASSERT (args->thread_index == vlib_get_thread_index ());
627 s = session_get (args->session_index, args->thread_index);
628 s->server_tx_fifo->master_session_index = args->new_session_index;
629 s->server_tx_fifo->master_thread_index = args->new_thread_index;
630 tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index);
632 clib_mem_free (cb_args);
636 * Move dgram session to the right thread
639 session_dgram_connect_notify (transport_connection_t * tc,
640 u32 old_thread_index,
641 stream_session_t ** new_session)
643 stream_session_t *new_s;
644 session_switch_pool_args_t *rpc_args;
647 * Clone half-open session to the right thread.
649 new_s = session_clone_safe (tc->s_index, old_thread_index);
650 new_s->connection_index = tc->c_index;
651 new_s->server_rx_fifo->master_session_index = new_s->session_index;
652 new_s->server_rx_fifo->master_thread_index = new_s->thread_index;
653 new_s->session_state = SESSION_STATE_READY;
654 session_lookup_add_connection (tc, session_handle (new_s));
657 * Ask thread owning the old session to clean it up and make us the tx
660 rpc_args = clib_mem_alloc (sizeof (*rpc_args));
661 rpc_args->new_session_index = new_s->session_index;
662 rpc_args->new_thread_index = new_s->thread_index;
663 rpc_args->session_index = tc->s_index;
664 rpc_args->thread_index = old_thread_index;
665 session_send_rpc_evt_to_thread (rpc_args->thread_index, session_switch_pool,
668 tc->s_index = new_s->session_index;
669 new_s->connection_index = tc->c_index;
670 *new_session = new_s;
675 stream_session_accept_notify (transport_connection_t * tc)
677 application_t *server;
680 s = session_get (tc->s_index, tc->thread_index);
681 server = application_get (s->app_index);
682 server->cb_fns.session_accept_callback (s);
686 * Notification from transport that connection is being closed.
688 * A disconnect is sent to application but state is not removed. Once
689 * disconnect is acknowledged by application, session disconnect is called.
690 * Ultimately this leads to close being called on transport (passive close).
693 stream_session_disconnect_notify (transport_connection_t * tc)
695 application_t *server;
698 s = session_get (tc->s_index, tc->thread_index);
699 server = application_get (s->app_index);
700 server->cb_fns.session_disconnect_callback (s);
704 * Cleans up session and lookup table.
707 stream_session_delete (stream_session_t * s)
711 /* Delete from the main lookup table. */
712 if ((rv = session_lookup_del_session (s)))
713 clib_warning ("hash delete error, rv %d", rv);
715 /* Cleanup fifo segments */
716 segment_manager_dealloc_fifos (s->svm_segment_index, s->server_rx_fifo,
722 * Notification from transport that connection is being deleted
724 * This removes the session if it is still valid. It should be called only on
725 * previously fully established sessions. For instance failed connects should
726 * call stream_session_connect_notify and indicate that the connect has
730 stream_session_delete_notify (transport_connection_t * tc)
734 /* App might've been removed already */
735 s = session_get_if_valid (tc->s_index, tc->thread_index);
738 stream_session_delete (s);
742 * Notify application that connection has been reset.
745 stream_session_reset_notify (transport_connection_t * tc)
749 s = session_get (tc->s_index, tc->thread_index);
751 app = application_get (s->app_index);
752 app->cb_fns.session_reset_callback (s);
756 * Accept a stream session. Optionally ping the server by callback.
759 stream_session_accept (transport_connection_t * tc, u32 listener_index,
762 application_t *server;
763 stream_session_t *s, *listener;
764 segment_manager_t *sm;
768 sst = session_type_from_proto_and_ip (tc->proto, tc->is_ip4);
770 /* Find the server */
771 listener = listen_session_get (sst, listener_index);
772 server = application_get (listener->app_index);
774 sm = application_get_listen_segment_manager (server, listener);
775 if ((rv = session_alloc_and_init (sm, tc, 1, &s)))
778 s->app_index = server->index;
779 s->listener_index = listener_index;
780 s->session_state = SESSION_STATE_ACCEPTING;
782 /* Shoulder-tap the server */
785 server->cb_fns.session_accept_callback (s);
792 * Ask transport to open connection to remote transport endpoint.
794 * Stores handle for matching request with reply since the call can be
795 * asynchronous. For instance, for TCP the 3-way handshake must complete
796 * before reply comes. Session is only created once connection is established.
798 * @param app_index Index of the application requesting the connect
799 * @param st Session type requested.
800 * @param tep Remote transport endpoint
801 * @param opaque Opaque data (typically, api_context) the application expects
802 * on open completion.
805 session_open (u32 app_index, session_endpoint_t * rmt, u32 opaque)
807 transport_connection_t *tc;
809 segment_manager_t *sm;
815 sst = session_type_from_proto_and_ip (rmt->transport_proto, rmt->is_ip4);
816 rv = tp_vfts[sst].open (session_endpoint_to_transport (rmt));
819 SESSION_DBG ("Transport failed to open connection.");
820 return VNET_API_ERROR_SESSION_CONNECT;
823 tc = tp_vfts[sst].get_half_open ((u32) rv);
825 /* If transport offers a stream service, only allocate session once the
826 * connection has been established.
828 if (transport_is_stream (rmt->transport_proto))
830 /* Add connection to half-open table and save app and tc index. The
831 * latter is needed to help establish the connection while the former
832 * is needed when the connect notify comes and we have to notify the
835 handle = (((u64) app_index) << 32) | (u64) tc->c_index;
836 session_lookup_add_half_open (tc, handle);
838 /* Store api_context (opaque) for when the reply comes. Not the nicest
839 * thing but better than allocating a separate half-open pool.
841 tc->s_index = opaque;
843 /* For dgram type of service, allocate session and fifos now.
847 app = application_get (app_index);
848 sm = application_get_connect_segment_manager (app);
850 if (session_alloc_and_init (sm, tc, 1, &s))
852 s->app_index = app->index;
853 s->session_state = SESSION_STATE_CONNECTING_READY;
855 /* Tell the app about the new event fifo for this session */
856 app->cb_fns.session_connected_callback (app->index, opaque, s, 0);
862 * Ask transport to listen on local transport endpoint.
864 * @param s Session for which listen will be called. Note that unlike
865 * established sessions, listen sessions are not associated to a
867 * @param tep Local endpoint to be listened on.
870 stream_session_listen (stream_session_t * s, session_endpoint_t * sep)
872 transport_connection_t *tc;
875 /* Transport bind/listen */
876 tci = tp_vfts[s->session_type].bind (s->session_index,
877 session_endpoint_to_transport (sep));
879 if (tci == (u32) ~ 0)
882 /* Attach transport to session */
883 s->connection_index = tci;
884 tc = tp_vfts[s->session_type].get_listener (tci);
886 /* Weird but handle it ... */
890 /* Add to the main lookup table */
891 session_lookup_add_connection (tc, s->session_index);
896 * Ask transport to stop listening on local transport endpoint.
898 * @param s Session to stop listening on. It must be in state LISTENING.
901 stream_session_stop_listen (stream_session_t * s)
903 transport_connection_t *tc;
905 if (s->session_state != SESSION_STATE_LISTENING)
907 clib_warning ("not a listening session");
911 tc = tp_vfts[s->session_type].get_listener (s->connection_index);
914 clib_warning ("no transport");
915 return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
918 session_lookup_del_connection (tc);
919 tp_vfts[s->session_type].unbind (s->connection_index);
924 * Disconnect session and propagate to transport. This should eventually
925 * result in a delete notification that allows us to cleanup session state.
926 * Called for both active/passive disconnects.
928 * Should be called from the session's thread.
931 stream_session_disconnect (stream_session_t * s)
933 s->session_state = SESSION_STATE_CLOSED;
934 tp_vfts[s->session_type].close (s->connection_index, s->thread_index);
938 * Cleanup transport and session state.
940 * Notify transport of the cleanup, wait for a delete notify to actually
941 * remove the session state.
944 stream_session_cleanup (stream_session_t * s)
948 s->session_state = SESSION_STATE_CLOSED;
950 /* Delete from the main lookup table to avoid more enqueues */
951 rv = session_lookup_del_session (s);
953 clib_warning ("hash delete error, rv %d", rv);
955 tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index);
959 * Allocate vpp event queue (once) per worker thread
962 session_vpp_event_queue_allocate (session_manager_main_t * smm,
965 api_main_t *am = &api_main;
967 u32 event_queue_length = 2048;
969 if (smm->vpp_event_queues[thread_index] == 0)
971 /* Allocate event fifo in the /vpe-api shared-memory segment */
972 oldheap = svm_push_data_heap (am->vlib_rp);
974 if (smm->configured_event_queue_length)
975 event_queue_length = smm->configured_event_queue_length;
977 smm->vpp_event_queues[thread_index] =
978 unix_shared_memory_queue_init
980 sizeof (session_fifo_event_t), 0 /* consumer pid */ ,
981 0 /* (do not) send signal when queue non-empty */ );
983 svm_pop_heap (oldheap);
988 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
990 if (proto == TRANSPORT_PROTO_TCP)
993 return SESSION_TYPE_IP4_TCP;
995 return SESSION_TYPE_IP6_TCP;
1000 return SESSION_TYPE_IP4_UDP;
1002 return SESSION_TYPE_IP6_UDP;
1005 return SESSION_N_TYPES;
1008 transport_connection_t *
1009 session_get_transport (stream_session_t * s)
1011 if (s->session_state != SESSION_STATE_LISTENING)
1012 return tp_vfts[s->session_type].get_connection (s->connection_index,
1017 transport_connection_t *
1018 listen_session_get_transport (stream_session_t * s)
1020 return tp_vfts[s->session_type].get_listener (s->connection_index);
1024 listen_session_get_local_session_endpoint (stream_session_t * listener,
1025 session_endpoint_t * sep)
1027 transport_connection_t *tc;
1029 tp_vfts[listener->session_type].get_listener (listener->connection_index);
1032 clib_warning ("no transport");
1036 /* N.B. The ip should not be copied because this is the local endpoint */
1037 sep->port = tc->lcl_port;
1038 sep->transport_proto = tc->proto;
1039 sep->is_ip4 = tc->is_ip4;
1043 static clib_error_t *
1044 session_manager_main_enable (vlib_main_t * vm)
1046 session_manager_main_t *smm = &session_manager_main;
1047 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1049 u32 preallocated_sessions_per_worker;
1052 num_threads = 1 /* main thread */ + vtm->n_threads;
1054 if (num_threads < 1)
1055 return clib_error_return (0, "n_thread_stacks not set");
1057 /* $$$ config parameters */
1058 svm_fifo_segment_init (0x200000000ULL /* first segment base VA */ ,
1059 20 /* timeout in seconds */ );
1061 /* configure per-thread ** vectors */
1062 vec_validate (smm->sessions, num_threads - 1);
1063 vec_validate (smm->tx_buffers, num_threads - 1);
1064 vec_validate (smm->pending_event_vector, num_threads - 1);
1065 vec_validate (smm->pending_disconnects, num_threads - 1);
1066 vec_validate (smm->free_event_vector, num_threads - 1);
1067 vec_validate (smm->vpp_event_queues, num_threads - 1);
1068 vec_validate (smm->session_peekers, num_threads - 1);
1069 vec_validate (smm->peekers_readers_locks, num_threads - 1);
1070 vec_validate (smm->peekers_write_locks, num_threads - 1);
1072 for (i = 0; i < TRANSPORT_N_PROTO; i++)
1073 for (j = 0; j < num_threads; j++)
1075 vec_validate (smm->session_to_enqueue[i], num_threads - 1);
1076 vec_validate (smm->current_enqueue_epoch[i], num_threads - 1);
1079 for (i = 0; i < num_threads; i++)
1081 vec_validate (smm->free_event_vector[i], 0);
1082 _vec_len (smm->free_event_vector[i]) = 0;
1083 vec_validate (smm->pending_event_vector[i], 0);
1084 _vec_len (smm->pending_event_vector[i]) = 0;
1085 vec_validate (smm->pending_disconnects[i], 0);
1086 _vec_len (smm->pending_disconnects[i]) = 0;
1087 if (num_threads > 1)
1089 clib_spinlock_init (&smm->peekers_readers_locks[i]);
1090 clib_spinlock_init (&smm->peekers_write_locks[i]);
1095 vec_validate (smm->last_event_poll_by_thread, num_threads - 1);
1098 /* Allocate vpp event queues */
1099 for (i = 0; i < vec_len (smm->vpp_event_queues); i++)
1100 session_vpp_event_queue_allocate (smm, i);
1102 /* Preallocate sessions */
1103 if (smm->preallocated_sessions)
1105 if (num_threads == 1)
1107 pool_init_fixed (smm->sessions[0], smm->preallocated_sessions);
1112 preallocated_sessions_per_worker =
1113 (1.1 * (f64) smm->preallocated_sessions /
1114 (f64) (num_threads - 1));
1116 for (j = 1; j < num_threads; j++)
1118 pool_init_fixed (smm->sessions[j],
1119 preallocated_sessions_per_worker);
1124 session_lookup_init ();
1125 app_namespaces_init ();
1128 smm->is_enabled = 1;
1130 /* Enable TCP transport */
1131 vnet_tcp_enable_disable (vm, 1);
1137 session_node_enable_disable (u8 is_en)
1139 u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED;
1141 foreach_vlib_main (({
1142 vlib_node_set_state (this_vlib_main, session_queue_node.index,
1149 vnet_session_enable_disable (vlib_main_t * vm, u8 is_en)
1151 clib_error_t *error = 0;
1154 if (session_manager_main.is_enabled)
1157 session_node_enable_disable (is_en);
1158 error = session_manager_main_enable (vm);
1162 session_manager_main.is_enabled = 0;
1163 session_node_enable_disable (is_en);
1170 session_manager_main_init (vlib_main_t * vm)
1172 session_manager_main_t *smm = &session_manager_main;
1173 smm->is_enabled = 0;
1177 VLIB_INIT_FUNCTION (session_manager_main_init);
1179 static clib_error_t *
1180 session_config_fn (vlib_main_t * vm, unformat_input_t * input)
1182 session_manager_main_t *smm = &session_manager_main;
1186 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1188 if (unformat (input, "event-queue-length %d", &nitems))
1191 smm->configured_event_queue_length = nitems;
1193 clib_warning ("event queue length %d too small, ignored", nitems);
1195 else if (unformat (input, "preallocated-sessions %d",
1196 &smm->preallocated_sessions))
1198 else if (unformat (input, "v4-session-table-buckets %d",
1199 &smm->configured_v4_session_table_buckets))
1201 else if (unformat (input, "v4-halfopen-table-buckets %d",
1202 &smm->configured_v4_halfopen_table_buckets))
1204 else if (unformat (input, "v6-session-table-buckets %d",
1205 &smm->configured_v6_session_table_buckets))
1207 else if (unformat (input, "v6-halfopen-table-buckets %d",
1208 &smm->configured_v6_halfopen_table_buckets))
1210 else if (unformat (input, "v4-session-table-memory %U",
1211 unformat_memory_size, &tmp))
1213 if (tmp >= 0x100000000)
1214 return clib_error_return (0, "memory size %llx (%lld) too large",
1216 smm->configured_v4_session_table_memory = tmp;
1218 else if (unformat (input, "v4-halfopen-table-memory %U",
1219 unformat_memory_size, &tmp))
1221 if (tmp >= 0x100000000)
1222 return clib_error_return (0, "memory size %llx (%lld) too large",
1224 smm->configured_v4_halfopen_table_memory = tmp;
1226 else if (unformat (input, "v6-session-table-memory %U",
1227 unformat_memory_size, &tmp))
1229 if (tmp >= 0x100000000)
1230 return clib_error_return (0, "memory size %llx (%lld) too large",
1232 smm->configured_v6_session_table_memory = tmp;
1234 else if (unformat (input, "v6-halfopen-table-memory %U",
1235 unformat_memory_size, &tmp))
1237 if (tmp >= 0x100000000)
1238 return clib_error_return (0, "memory size %llx (%lld) too large",
1240 smm->configured_v6_halfopen_table_memory = tmp;
1243 return clib_error_return (0, "unknown input `%U'",
1244 format_unformat_error, input);
1249 VLIB_CONFIG_FUNCTION (session_config_fn, "session");
1252 * fd.io coding-style-patch-verification: ON
1255 * eval: (c-set-style "gnu")