2 * Copyright (c) 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.
16 #include <vnet/session/application_local.h>
17 #include <vnet/session/session.h>
19 typedef enum ct_segment_flags_
21 CT_SEGMENT_F_CLIENT_DETACHED = 1 << 0,
22 CT_SEGMENT_F_SERVER_DETACHED = 1 << 1,
25 typedef struct ct_segment_
27 u32 client_n_sessions;
28 u32 server_n_sessions;
32 ct_segment_flags_t flags;
35 typedef struct ct_segments_
41 ct_segment_t *segments;
44 typedef struct ct_cleanup_req_
49 typedef struct ct_main_
51 ct_connection_t **connections; /**< Per-worker connection pools */
52 ct_cleanup_req_t **pending_cleanups;
54 u32 n_workers; /**< Number of vpp workers */
55 u32 n_sessions; /**< Cumulative sessions counter */
56 u32 *ho_reusable; /**< Vector of reusable ho indices */
57 clib_spinlock_t ho_reuseable_lock; /**< Lock for reusable ho indices */
58 clib_rwlock_t app_segs_lock; /**< RW lock for seg contexts */
59 uword *app_segs_ctxs_table; /**< App handle to segment pool map */
60 ct_segments_ctx_t *app_seg_ctxs; /**< Pool of ct segment contexts */
63 static ct_main_t ct_main;
65 static ct_connection_t *
66 ct_connection_alloc (u32 thread_index)
70 pool_get_zero (ct_main.connections[thread_index], ct);
71 ct->c_c_index = ct - ct_main.connections[thread_index];
72 ct->c_thread_index = thread_index;
75 ct->seg_ctx_index = ~0;
76 ct->ct_seg_index = ~0;
80 static ct_connection_t *
81 ct_connection_get (u32 ct_index, u32 thread_index)
83 if (pool_is_free_index (ct_main.connections[thread_index], ct_index))
85 return pool_elt_at_index (ct_main.connections[thread_index], ct_index);
89 ct_connection_free (ct_connection_t * ct)
93 u32 thread_index = ct->c_thread_index;
94 memset (ct, 0xfc, sizeof (*ct));
95 pool_put (ct_main.connections[thread_index], ct);
98 pool_put (ct_main.connections[ct->c_thread_index], ct);
101 static ct_connection_t *
102 ct_half_open_alloc (void)
104 ct_main_t *cm = &ct_main;
107 clib_spinlock_lock (&cm->ho_reuseable_lock);
108 vec_foreach (hip, cm->ho_reusable)
109 pool_put_index (cm->connections[0], *hip);
110 vec_reset_length (cm->ho_reusable);
111 clib_spinlock_unlock (&cm->ho_reuseable_lock);
113 return ct_connection_alloc (0);
117 ct_half_open_add_reusable (u32 ho_index)
119 ct_main_t *cm = &ct_main;
121 clib_spinlock_lock (&cm->ho_reuseable_lock);
122 vec_add1 (cm->ho_reusable, ho_index);
123 clib_spinlock_unlock (&cm->ho_reuseable_lock);
127 ct_session_get_peer (session_t * s)
129 ct_connection_t *ct, *peer_ct;
130 ct = ct_connection_get (s->connection_index, s->thread_index);
131 peer_ct = ct_connection_get (ct->peer_index, s->thread_index);
132 return session_get (peer_ct->c_s_index, s->thread_index);
136 ct_session_endpoint (session_t * ll, session_endpoint_t * sep)
139 ct = (ct_connection_t *) session_get_transport (ll);
140 sep->transport_proto = ct->actual_tp;
141 sep->port = ct->c_lcl_port;
142 sep->is_ip4 = ct->c_is_ip4;
143 ip_copy (&sep->ip, &ct->c_lcl_ip, ct->c_is_ip4);
147 ct_set_invalid_app_wrk (ct_connection_t *ct, u8 is_client)
149 ct_connection_t *peer_ct;
151 peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index);
155 ct->client_wrk = APP_INVALID_INDEX;
157 ct->client_wrk = APP_INVALID_INDEX;
161 ct->server_wrk = APP_INVALID_INDEX;
163 ct->server_wrk = APP_INVALID_INDEX;
168 ct_session_dealloc_fifos (ct_connection_t *ct, svm_fifo_t *rx_fifo,
171 ct_segments_ctx_t *seg_ctx;
172 ct_main_t *cm = &ct_main;
173 segment_manager_t *sm;
174 app_worker_t *app_wrk;
175 ct_segment_t *ct_seg;
185 sm = segment_manager_get (rx_fifo->segment_manager);
186 seg_index = rx_fifo->segment_index;
188 fs = segment_manager_get_segment_w_lock (sm, seg_index);
189 fifo_segment_free_fifo (fs, rx_fifo);
190 fifo_segment_free_fifo (fs, tx_fifo);
191 segment_manager_segment_reader_unlock (sm);
194 * Atomically update segment context with readers lock
197 clib_rwlock_reader_lock (&cm->app_segs_lock);
199 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
200 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
202 if (ct->flags & CT_CONN_F_CLIENT)
205 __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
210 __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
213 clib_rwlock_reader_unlock (&cm->app_segs_lock);
216 * No need to do any app updates, return
223 * Grab exclusive lock and update flags unless some other thread
224 * added more sessions
226 clib_rwlock_writer_lock (&cm->app_segs_lock);
228 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
229 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
230 if (ct->flags & CT_CONN_F_CLIENT)
232 cnt = ct_seg->client_n_sessions;
235 ct_seg->flags |= CT_SEGMENT_F_CLIENT_DETACHED;
236 s = session_get (ct->c_s_index, ct->c_thread_index);
237 if (s->app_wrk_index == APP_INVALID_INDEX)
238 ct_set_invalid_app_wrk (ct, 1 /* is_client */);
242 cnt = ct_seg->server_n_sessions;
245 ct_seg->flags |= CT_SEGMENT_F_SERVER_DETACHED;
246 s = session_get (ct->c_s_index, ct->c_thread_index);
247 if (s->app_wrk_index == APP_INVALID_INDEX)
248 ct_set_invalid_app_wrk (ct, 0 /* is_client */);
251 if (!(ct_seg->flags & CT_SEGMENT_F_CLIENT_DETACHED) ||
252 !(ct_seg->flags & CT_SEGMENT_F_SERVER_DETACHED))
256 * Remove segment context because both client and server detached
259 pool_put_index (seg_ctx->segments, ct->ct_seg_index);
262 * No more segment indices left, remove the segments context
264 if (!pool_elts (seg_ctx->segments))
266 u64 table_handle = seg_ctx->client_wrk << 16 | seg_ctx->server_wrk;
267 table_handle = (u64) seg_ctx->sm_index << 32 | table_handle;
268 hash_unset (cm->app_segs_ctxs_table, table_handle);
269 pool_free (seg_ctx->segments);
270 pool_put_index (cm->app_seg_ctxs, ct->seg_ctx_index);
274 * Segment to be removed so notify both apps
277 app_wrk = app_worker_get_if_valid (ct->client_wrk);
278 /* Determine if client app still needs notification, i.e., if it is
279 * still attached. If client detached and this is the last ct session
280 * on this segment, then its connects segment manager should also be
281 * detached, so do not send notification */
284 segment_manager_t *csm;
285 csm = app_worker_get_connect_segment_manager (app_wrk);
286 if (!segment_manager_app_detached (csm))
287 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
290 if (!segment_manager_app_detached (sm))
292 app_wrk = app_worker_get (ct->server_wrk);
293 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
296 segment_manager_lock_and_del_segment (sm, seg_index);
298 /* Cleanup segment manager if needed. If server detaches there's a chance
299 * the client's sessions will hold up segment removal */
300 if (segment_manager_app_detached (sm) && !segment_manager_has_fifos (sm))
301 segment_manager_free_safe (sm);
305 clib_rwlock_writer_unlock (&cm->app_segs_lock);
309 ct_session_connect_notify (session_t *ss, session_error_t err)
311 u32 ss_index, opaque, thread_index;
312 ct_connection_t *sct, *cct;
313 app_worker_t *client_wrk;
316 ss_index = ss->session_index;
317 thread_index = ss->thread_index;
318 sct = (ct_connection_t *) session_get_transport (ss);
319 client_wrk = app_worker_get (sct->client_wrk);
320 opaque = sct->client_opaque;
322 cct = ct_connection_get (sct->peer_index, thread_index);
324 /* Client closed while waiting for reply from server */
325 if (PREDICT_FALSE (!cct))
327 session_transport_closing_notify (&sct->connection);
328 session_transport_delete_notify (&sct->connection);
329 ct_connection_free (sct);
333 session_half_open_delete_notify (&cct->connection);
334 cct->flags &= ~CT_CONN_F_HALF_OPEN;
336 if (PREDICT_FALSE (err))
340 * Alloc client session
343 cs = session_alloc (thread_index);
344 ss = session_get (ss_index, thread_index);
345 cs->session_type = ss->session_type;
346 cs->listener_handle = SESSION_INVALID_HANDLE;
347 cs->session_state = SESSION_STATE_CONNECTING;
348 cs->app_wrk_index = client_wrk->wrk_index;
349 cs->connection_index = cct->c_c_index;
350 cct->c_s_index = cs->session_index;
352 /* This will allocate fifos for the session. They won't be used for
353 * exchanging data but they will be used to close the connection if
354 * the segment manager/worker is freed */
355 if ((err = app_worker_init_connected (client_wrk, cs)))
359 err = SESSION_E_ALLOC;
363 cs->session_state = SESSION_STATE_CONNECTING;
365 if (app_worker_connect_notify (client_wrk, cs, 0, opaque))
367 segment_manager_dealloc_fifos (cs->rx_fifo, cs->tx_fifo);
373 cs = session_get (cct->c_s_index, cct->c_thread_index);
374 cs->session_state = SESSION_STATE_READY;
380 app_worker_connect_notify (client_wrk, 0, err, cct->client_opaque);
384 if (cct->client_rx_fifo)
385 ct_session_dealloc_fifos (cct, cct->client_rx_fifo, cct->client_tx_fifo);
386 ct_connection_free (cct);
390 static inline ct_segment_t *
391 ct_lookup_free_segment (ct_main_t *cm, segment_manager_t *sm,
394 uword free_bytes, max_free_bytes;
395 ct_segment_t *ct_seg, *res = 0;
396 ct_segments_ctx_t *seg_ctx;
400 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index);
401 max_free_bytes = seg_ctx->fifo_pair_bytes;
403 pool_foreach (ct_seg, seg_ctx->segments)
405 /* Client or server has detached so segment cannot be used */
406 fs = segment_manager_get_segment (sm, ct_seg->segment_index);
407 free_bytes = fifo_segment_available_bytes (fs);
408 max_fifos = fifo_segment_size (fs) / seg_ctx->fifo_pair_bytes;
409 if (free_bytes > max_free_bytes &&
410 fifo_segment_num_fifos (fs) / 2 < max_fifos)
412 max_free_bytes = free_bytes;
420 static ct_segment_t *
421 ct_alloc_segment (ct_main_t *cm, app_worker_t *server_wrk, u64 table_handle,
422 segment_manager_t *sm, u32 client_wrk_index)
424 u32 seg_ctx_index = ~0, sm_index, pair_bytes;
425 segment_manager_props_t *props;
426 const u32 margin = 16 << 10;
427 ct_segments_ctx_t *seg_ctx;
428 app_worker_t *client_wrk;
429 u64 seg_size, seg_handle;
430 application_t *server;
431 ct_segment_t *ct_seg;
435 server = application_get (server_wrk->app_index);
436 props = application_segment_manager_properties (server);
437 sm_index = segment_manager_index (sm);
438 pair_bytes = props->rx_fifo_size + props->tx_fifo_size + margin;
441 * Make sure another thread did not alloc a segment while acquiring the lock
444 spp = hash_get (cm->app_segs_ctxs_table, table_handle);
447 seg_ctx_index = *spp;
448 ct_seg = ct_lookup_free_segment (cm, sm, seg_ctx_index);
454 * No segment, try to alloc one and notify the server and the client.
455 * Make sure the segment is not used for other fifos
457 seg_size = clib_max (props->segment_size, 128 << 20);
459 segment_manager_add_segment2 (sm, seg_size, FIFO_SEGMENT_F_CUSTOM_USE);
463 if (seg_ctx_index == ~0)
465 pool_get_zero (cm->app_seg_ctxs, seg_ctx);
466 seg_ctx_index = seg_ctx - cm->app_seg_ctxs;
467 hash_set (cm->app_segs_ctxs_table, table_handle, seg_ctx_index);
468 seg_ctx->server_wrk = server_wrk->wrk_index;
469 seg_ctx->client_wrk = client_wrk_index;
470 seg_ctx->sm_index = sm_index;
471 seg_ctx->fifo_pair_bytes = pair_bytes;
475 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index);
478 pool_get_zero (seg_ctx->segments, ct_seg);
479 ct_seg->segment_index = fs_index;
480 ct_seg->server_n_sessions = 0;
481 ct_seg->client_n_sessions = 0;
482 ct_seg->ct_seg_index = ct_seg - seg_ctx->segments;
483 ct_seg->seg_ctx_index = seg_ctx_index;
485 /* New segment, notify the server and client */
486 seg_handle = segment_manager_make_segment_handle (sm_index, fs_index);
487 if (app_worker_add_segment_notify (server_wrk, seg_handle))
490 client_wrk = app_worker_get (client_wrk_index);
491 if (app_worker_add_segment_notify (client_wrk, seg_handle))
493 app_worker_del_segment_notify (server_wrk, seg_handle);
501 segment_manager_lock_and_del_segment (sm, fs_index);
502 pool_put_index (seg_ctx->segments, ct_seg->seg_ctx_index);
507 ct_init_accepted_session (app_worker_t *server_wrk, ct_connection_t *ct,
508 session_t *ls, session_t *ll)
510 segment_manager_props_t *props;
511 u64 seg_handle, table_handle;
512 u32 sm_index, fs_index = ~0;
513 ct_segments_ctx_t *seg_ctx;
514 ct_main_t *cm = &ct_main;
515 application_t *server;
516 segment_manager_t *sm;
517 ct_segment_t *ct_seg;
522 sm = app_worker_get_listen_segment_manager (server_wrk, ll);
523 sm_index = segment_manager_index (sm);
524 server = application_get (server_wrk->app_index);
525 props = application_segment_manager_properties (server);
527 table_handle = ct->client_wrk << 16 | server_wrk->wrk_index;
528 table_handle = (u64) sm_index << 32 | table_handle;
531 * Check if we already have a segment that can hold the fifos
534 clib_rwlock_reader_lock (&cm->app_segs_lock);
536 spp = hash_get (cm->app_segs_ctxs_table, table_handle);
539 ct_seg = ct_lookup_free_segment (cm, sm, *spp);
542 ct->seg_ctx_index = ct_seg->seg_ctx_index;
543 ct->ct_seg_index = ct_seg->ct_seg_index;
544 fs_index = ct_seg->segment_index;
546 ~(CT_SEGMENT_F_SERVER_DETACHED | CT_SEGMENT_F_CLIENT_DETACHED);
547 __atomic_add_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
548 __atomic_add_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
552 clib_rwlock_reader_unlock (&cm->app_segs_lock);
555 * If not, grab exclusive lock and allocate segment
559 clib_rwlock_writer_lock (&cm->app_segs_lock);
562 ct_alloc_segment (cm, server_wrk, table_handle, sm, ct->client_wrk);
565 clib_rwlock_writer_unlock (&cm->app_segs_lock);
569 ct->seg_ctx_index = ct_seg->seg_ctx_index;
570 ct->ct_seg_index = ct_seg->ct_seg_index;
571 ct_seg->server_n_sessions += 1;
572 ct_seg->client_n_sessions += 1;
573 fs_index = ct_seg->segment_index;
575 clib_rwlock_writer_unlock (&cm->app_segs_lock);
579 * Allocate and initialize the fifos
581 fs = segment_manager_get_segment_w_lock (sm, fs_index);
582 rv = segment_manager_try_alloc_fifos (
583 fs, ls->thread_index, props->rx_fifo_size, props->tx_fifo_size,
584 &ls->rx_fifo, &ls->tx_fifo);
587 segment_manager_segment_reader_unlock (sm);
589 clib_rwlock_reader_lock (&cm->app_segs_lock);
591 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
592 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
593 __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
594 __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
596 clib_rwlock_reader_unlock (&cm->app_segs_lock);
601 ls->rx_fifo->shr->master_session_index = ls->session_index;
602 ls->tx_fifo->shr->master_session_index = ls->session_index;
603 ls->rx_fifo->master_thread_index = ls->thread_index;
604 ls->tx_fifo->master_thread_index = ls->thread_index;
605 ls->rx_fifo->segment_manager = sm_index;
606 ls->tx_fifo->segment_manager = sm_index;
607 ls->rx_fifo->segment_index = fs_index;
608 ls->tx_fifo->segment_index = fs_index;
610 seg_handle = segment_manager_segment_handle (sm, fs);
611 segment_manager_segment_reader_unlock (sm);
613 ct->segment_handle = seg_handle;
619 ct_accept_rpc_wrk_handler (void *accept_args)
621 u32 cct_index, ho_index, thread_index, ll_index;
622 ct_connection_t *sct, *cct, *ho;
623 transport_connection_t *ll_ct;
624 app_worker_t *server_wrk;
628 * Alloc client ct and initialize from ho
630 thread_index = vlib_get_thread_index ();
631 cct = ct_connection_alloc (thread_index);
632 cct_index = cct->c_c_index;
634 ho_index = pointer_to_uword (accept_args);
635 ho = ct_connection_get (ho_index, 0);
637 /* Unlikely but half-open session and transport could have been freed */
638 if (PREDICT_FALSE (!ho))
640 ct_connection_free (cct);
644 clib_memcpy (cct, ho, sizeof (*ho));
645 cct->c_c_index = cct_index;
646 cct->c_thread_index = thread_index;
647 cct->flags |= CT_CONN_F_HALF_OPEN;
649 /* Notify session layer that half-open is on a different thread
650 * and mark ho connection index reusable. Avoids another rpc
652 session_half_open_migrate_notify (&cct->connection);
653 session_half_open_migrated_notify (&cct->connection);
654 ct_half_open_add_reusable (ho_index);
657 * Alloc and init server transport
660 ll_index = cct->peer_index;
661 ll = listen_session_get (ll_index);
662 sct = ct_connection_alloc (thread_index);
663 /* Transport not necessarily ct but it might, so grab after sct alloc */
664 ll_ct = listen_session_get_transport (ll);
666 /* Make sure cct is valid after sct alloc */
667 cct = ct_connection_get (cct_index, thread_index);
670 sct->c_lcl_port = ll_ct->lcl_port;
671 sct->c_is_ip4 = cct->c_is_ip4;
672 clib_memcpy (&sct->c_lcl_ip, &cct->c_rmt_ip, sizeof (cct->c_rmt_ip));
673 sct->client_wrk = cct->client_wrk;
674 sct->c_proto = TRANSPORT_PROTO_NONE;
675 sct->client_opaque = cct->client_opaque;
676 sct->actual_tp = cct->actual_tp;
678 sct->peer_index = cct->c_c_index;
679 cct->peer_index = sct->c_c_index;
682 * Accept server session. Client session is created only after
683 * server confirms accept.
685 ss = session_alloc (thread_index);
686 ll = listen_session_get (ll_index);
687 ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE,
689 ss->connection_index = sct->c_c_index;
690 ss->listener_handle = listen_session_get_handle (ll);
691 ss->session_state = SESSION_STATE_CREATED;
693 server_wrk = application_listener_select_worker (ll);
694 ss->app_wrk_index = server_wrk->wrk_index;
696 sct->c_s_index = ss->session_index;
697 sct->server_wrk = ss->app_wrk_index;
699 if (ct_init_accepted_session (server_wrk, sct, ss, ll))
701 ct_session_connect_notify (ss, SESSION_E_ALLOC);
702 ct_connection_free (sct);
707 cct->server_wrk = sct->server_wrk;
708 cct->seg_ctx_index = sct->seg_ctx_index;
709 cct->ct_seg_index = sct->ct_seg_index;
710 cct->client_rx_fifo = ss->tx_fifo;
711 cct->client_tx_fifo = ss->rx_fifo;
712 cct->client_rx_fifo->refcnt++;
713 cct->client_tx_fifo->refcnt++;
714 cct->segment_handle = sct->segment_handle;
716 ss->session_state = SESSION_STATE_ACCEPTING;
717 if (app_worker_accept_notify (server_wrk, ss))
719 ct_session_connect_notify (ss, SESSION_E_REFUSED);
720 ct_session_dealloc_fifos (sct, ss->rx_fifo, ss->tx_fifo);
721 ct_connection_free (sct);
727 ct_connect (app_worker_t * client_wrk, session_t * ll,
728 session_endpoint_cfg_t * sep)
730 u32 thread_index, ho_index;
731 ct_main_t *cm = &ct_main;
734 /* Simple round-robin policy for spreading sessions over workers. We skip
735 * thread index 0, i.e., offset the index by 1, when we have workers as it
736 * is the one dedicated to main thread. Note that n_workers does not include
739 thread_index = cm->n_workers ? (cm->n_sessions % cm->n_workers) + 1 : 0;
742 * Alloc and init client half-open transport
745 ho = ct_half_open_alloc ();
746 ho_index = ho->c_c_index;
747 ho->c_rmt_port = sep->port;
749 ho->c_is_ip4 = sep->is_ip4;
750 ho->client_opaque = sep->opaque;
751 ho->client_wrk = client_wrk->wrk_index;
752 ho->peer_index = ll->session_index;
753 ho->c_proto = TRANSPORT_PROTO_NONE;
754 ho->c_flags |= TRANSPORT_CONNECTION_F_NO_LOOKUP;
755 clib_memcpy (&ho->c_rmt_ip, &sep->ip, sizeof (sep->ip));
756 ho->flags |= CT_CONN_F_CLIENT;
758 ho->actual_tp = sep->original_tp;
761 * Accept connection on thread selected above. Connected reply comes
762 * after server accepts the connection.
765 session_send_rpc_evt_to_thread_force (thread_index,
766 ct_accept_rpc_wrk_handler,
767 uword_to_pointer (ho_index, void *));
773 ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
775 session_endpoint_cfg_t *sep;
778 sep = (session_endpoint_cfg_t *) tep;
779 ct = ct_connection_alloc (0);
780 ct->server_wrk = sep->app_wrk_index;
781 ct->c_is_ip4 = sep->is_ip4;
782 clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip));
783 ct->c_lcl_port = sep->port;
784 ct->c_s_index = app_listener_index;
785 ct->actual_tp = sep->transport_proto;
786 return ct->c_c_index;
790 ct_stop_listen (u32 ct_index)
793 ct = ct_connection_get (ct_index, 0);
794 ct_connection_free (ct);
798 static transport_connection_t *
799 ct_listener_get (u32 ct_index)
801 return (transport_connection_t *) ct_connection_get (ct_index, 0);
804 static transport_connection_t *
805 ct_half_open_get (u32 ct_index)
807 return (transport_connection_t *) ct_connection_get (ct_index, 0);
811 ct_session_cleanup (u32 conn_index, u32 thread_index)
813 ct_connection_t *ct, *peer_ct;
815 ct = ct_connection_get (conn_index, thread_index);
819 peer_ct = ct_connection_get (ct->peer_index, thread_index);
821 peer_ct->peer_index = ~0;
823 ct_connection_free (ct);
827 ct_cleanup_ho (u32 ho_index)
829 ct_connection_free (ct_connection_get (ho_index, 0));
833 ct_session_connect (transport_endpoint_cfg_t * tep)
835 session_endpoint_cfg_t *sep_ext;
836 session_endpoint_t _sep, *sep = &_sep;
837 app_worker_t *app_wrk;
845 sep_ext = (session_endpoint_cfg_t *) tep;
846 _sep = *(session_endpoint_t *) tep;
847 app_wrk = app_worker_get (sep_ext->app_wrk_index);
848 app = application_get (app_wrk->app_index);
850 sep->transport_proto = sep_ext->original_tp;
851 table_index = application_local_session_table (app);
852 lh = session_lookup_local_endpoint (table_index, sep);
853 if (lh == SESSION_DROP_HANDLE)
854 return SESSION_E_FILTERED;
856 if (lh == SESSION_INVALID_HANDLE)
859 ll = listen_session_get_from_handle (lh);
860 al = app_listener_get_w_session (ll);
863 * Break loop if rule in local table points to connecting app. This
864 * can happen if client is a generic proxy. Route connect through
865 * global table instead.
867 if (al->app_index == app->app_index)
870 return ct_connect (app_wrk, ll, sep_ext);
873 * If nothing found, check the global scope for locally attached
874 * destinations. Make sure first that we're allowed to.
878 if (session_endpoint_is_local (sep))
879 return SESSION_E_NOROUTE;
881 if (!application_has_global_scope (app))
882 return SESSION_E_SCOPE;
884 fib_proto = session_endpoint_fib_proto (sep);
885 table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index);
886 ll = session_lookup_listener_wildcard (table_index, sep);
888 /* Avoid connecting app to own listener */
889 if (ll && ll->app_index != app->app_index)
890 return ct_connect (app_wrk, ll, sep_ext);
892 /* Failed to connect but no error */
893 return SESSION_E_LOCAL_CONNECT;
897 ct_session_postponed_cleanup (ct_connection_t *ct)
899 app_worker_t *app_wrk;
902 s = session_get (ct->c_s_index, ct->c_thread_index);
903 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
905 if (ct->flags & CT_CONN_F_CLIENT)
908 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT);
910 /* Normal free for client session as the fifos are allocated through
911 * the connects segment manager in a segment that's not shared with
913 ct_session_dealloc_fifos (ct, ct->client_rx_fifo, ct->client_tx_fifo);
914 session_free_w_fifos (s);
918 /* Manual session and fifo segment cleanup to avoid implicit
919 * segment manager cleanups and notifications */
920 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
923 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT);
924 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_SESSION);
927 ct_session_dealloc_fifos (ct, s->rx_fifo, s->tx_fifo);
931 ct_connection_free (ct);
935 ct_handle_cleanups (void *args)
937 uword thread_index = pointer_to_uword (args);
938 const u32 max_cleanups = 100;
939 ct_main_t *cm = &ct_main;
940 ct_cleanup_req_t *req;
945 cm->heave_cleanups[thread_index] = 0;
946 n_to_handle = clib_fifo_elts (cm->pending_cleanups[thread_index]);
947 n_to_handle = clib_min (n_to_handle, max_cleanups);
951 clib_fifo_sub2 (cm->pending_cleanups[thread_index], req);
952 ct = ct_connection_get (req->ct_index, thread_index);
953 s = session_get (ct->c_s_index, ct->c_thread_index);
954 if (!svm_fifo_has_event (s->tx_fifo))
955 ct_session_postponed_cleanup (ct);
957 clib_fifo_add1 (cm->pending_cleanups[thread_index], *req);
961 if (clib_fifo_elts (cm->pending_cleanups[thread_index]))
963 cm->heave_cleanups[thread_index] = 1;
964 session_send_rpc_evt_to_thread_force (
965 thread_index, ct_handle_cleanups,
966 uword_to_pointer (thread_index, void *));
971 ct_program_cleanup (ct_connection_t *ct)
973 ct_main_t *cm = &ct_main;
974 ct_cleanup_req_t *req;
977 thread_index = ct->c_thread_index;
978 clib_fifo_add2 (cm->pending_cleanups[thread_index], req);
979 req->ct_index = ct->c_c_index;
981 if (cm->heave_cleanups[thread_index])
984 cm->heave_cleanups[thread_index] = 1;
985 session_send_rpc_evt_to_thread_force (
986 thread_index, ct_handle_cleanups, uword_to_pointer (thread_index, void *));
990 ct_close_is_reset (ct_connection_t *ct, session_t *s)
992 if (ct->flags & CT_CONN_F_CLIENT)
993 return (svm_fifo_max_dequeue (ct->client_rx_fifo) > 0);
995 return (svm_fifo_max_dequeue (s->rx_fifo) > 0);
999 ct_session_close (u32 ct_index, u32 thread_index)
1001 ct_connection_t *ct, *peer_ct;
1004 ct = ct_connection_get (ct_index, thread_index);
1005 s = session_get (ct->c_s_index, ct->c_thread_index);
1006 peer_ct = ct_connection_get (ct->peer_index, thread_index);
1009 peer_ct->peer_index = ~0;
1010 /* Make sure session was allocated */
1011 if (peer_ct->flags & CT_CONN_F_HALF_OPEN)
1013 ct_session_connect_notify (s, SESSION_E_REFUSED);
1015 else if (peer_ct->c_s_index != ~0)
1017 if (ct_close_is_reset (ct, s))
1018 session_transport_reset_notify (&peer_ct->connection);
1020 session_transport_closing_notify (&peer_ct->connection);
1024 /* should not happen */
1025 clib_warning ("ct peer without session");
1026 ct_connection_free (peer_ct);
1030 /* Do not send closed notify to make sure pending tx events are
1031 * still delivered and program cleanup */
1032 ct_program_cleanup (ct);
1035 static transport_connection_t *
1036 ct_session_get (u32 ct_index, u32 thread_index)
1038 return (transport_connection_t *) ct_connection_get (ct_index,
1043 format_ct_connection_id (u8 * s, va_list * args)
1045 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
1050 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
1051 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
1052 format_ip4_address, &ct->c_lcl_ip4,
1053 clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address,
1054 &ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port));
1058 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
1059 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
1060 format_ip6_address, &ct->c_lcl_ip6,
1061 clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address,
1062 &ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port));
1069 ct_custom_tx (void *session, transport_send_params_t * sp)
1071 session_t *s = (session_t *) session;
1072 if (session_has_transport (s))
1074 /* If event enqueued towards peer, remove from scheduler and remove
1075 * session tx flag, i.e., accept new tx events. Unset fifo flag now to
1076 * avoid missing events if peer did not clear fifo flag yet, which is
1077 * interpreted as successful notification and session is descheduled. */
1078 svm_fifo_unset_event (s->tx_fifo);
1079 if (!ct_session_tx (s))
1080 sp->flags = TRANSPORT_SND_F_DESCHED;
1082 /* The scheduler uses packet count as a means of upper bounding the amount
1083 * of work done per dispatch. So make it look like we have sent something */
1088 ct_app_rx_evt (transport_connection_t * tc)
1090 ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct;
1093 peer_ct = ct_connection_get (ct->peer_index, tc->thread_index);
1096 ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
1097 return session_dequeue_notify (ps);
1101 format_ct_listener (u8 * s, va_list * args)
1103 u32 tc_index = va_arg (*args, u32);
1104 u32 __clib_unused thread_index = va_arg (*args, u32);
1105 u32 __clib_unused verbose = va_arg (*args, u32);
1106 ct_connection_t *ct = ct_connection_get (tc_index, 0);
1107 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1109 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "LISTEN");
1114 format_ct_half_open (u8 *s, va_list *args)
1116 u32 ho_index = va_arg (*args, u32);
1117 u32 verbose = va_arg (*args, u32);
1118 ct_connection_t *ct = ct_connection_get (ho_index, 0);
1119 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1121 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "HALF-OPEN");
1126 format_ct_connection (u8 * s, va_list * args)
1128 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
1129 u32 verbose = va_arg (*args, u32);
1133 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1136 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "ESTABLISHED");
1139 s = format (s, "\n");
1146 format_ct_session (u8 * s, va_list * args)
1148 u32 ct_index = va_arg (*args, u32);
1149 u32 thread_index = va_arg (*args, u32);
1150 u32 verbose = va_arg (*args, u32);
1151 ct_connection_t *ct;
1153 ct = ct_connection_get (ct_index, thread_index);
1156 s = format (s, "empty\n");
1160 s = format (s, "%U", format_ct_connection, ct, verbose);
1165 ct_enable_disable (vlib_main_t * vm, u8 is_en)
1167 ct_main_t *cm = &ct_main;
1169 cm->n_workers = vlib_num_workers ();
1170 vec_validate (cm->connections, cm->n_workers);
1171 vec_validate (cm->pending_cleanups, cm->n_workers);
1172 vec_validate (cm->heave_cleanups, cm->n_workers);
1173 clib_spinlock_init (&cm->ho_reuseable_lock);
1174 clib_rwlock_init (&cm->app_segs_lock);
1179 static const transport_proto_vft_t cut_thru_proto = {
1180 .enable = ct_enable_disable,
1181 .start_listen = ct_start_listen,
1182 .stop_listen = ct_stop_listen,
1183 .get_connection = ct_session_get,
1184 .get_listener = ct_listener_get,
1185 .get_half_open = ct_half_open_get,
1186 .cleanup = ct_session_cleanup,
1187 .cleanup_ho = ct_cleanup_ho,
1188 .connect = ct_session_connect,
1189 .close = ct_session_close,
1190 .custom_tx = ct_custom_tx,
1191 .app_rx_evt = ct_app_rx_evt,
1192 .format_listener = format_ct_listener,
1193 .format_half_open = format_ct_half_open,
1194 .format_connection = format_ct_session,
1195 .transport_options = {
1198 .tx_type = TRANSPORT_TX_INTERNAL,
1199 .service_type = TRANSPORT_SERVICE_VC,
1205 ct_session_tx (session_t * s)
1207 ct_connection_t *ct, *peer_ct;
1210 ct = (ct_connection_t *) session_get_transport (s);
1211 peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index);
1214 peer_s = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
1215 if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
1217 return session_enqueue_notify (peer_s);
1220 static clib_error_t *
1221 ct_transport_init (vlib_main_t * vm)
1223 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
1224 FIB_PROTOCOL_IP4, ~0);
1225 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
1226 FIB_PROTOCOL_IP6, ~0);
1230 VLIB_INIT_FUNCTION (ct_transport_init);
1233 * fd.io coding-style-patch-verification: ON
1236 * eval: (c-set-style "gnu")