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_session_dealloc_fifos (ct_connection_t *ct, svm_fifo_t *rx_fifo,
150 ct_segments_ctx_t *seg_ctx;
151 ct_main_t *cm = &ct_main;
152 segment_manager_t *sm;
153 app_worker_t *app_wrk;
154 ct_segment_t *ct_seg;
164 sm = segment_manager_get (rx_fifo->segment_manager);
165 seg_index = rx_fifo->segment_index;
167 fs = segment_manager_get_segment_w_lock (sm, seg_index);
168 fifo_segment_free_fifo (fs, rx_fifo);
169 fifo_segment_free_fifo (fs, tx_fifo);
170 segment_manager_segment_reader_unlock (sm);
173 * Atomically update segment context with readers lock
176 clib_rwlock_reader_lock (&cm->app_segs_lock);
178 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
179 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
181 if (ct->flags & CT_CONN_F_CLIENT)
184 __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
189 __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
192 clib_rwlock_reader_unlock (&cm->app_segs_lock);
195 * No need to do any app updates, return
202 * Grab exclusive lock and update flags unless some other thread
203 * added more sessions
205 clib_rwlock_writer_lock (&cm->app_segs_lock);
207 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
208 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
209 if (ct->flags & CT_CONN_F_CLIENT)
211 cnt = ct_seg->client_n_sessions;
213 ct_seg->flags |= CT_SEGMENT_F_CLIENT_DETACHED;
217 cnt = ct_seg->server_n_sessions;
219 ct_seg->flags |= CT_SEGMENT_F_SERVER_DETACHED;
223 * Remove segment context because both client and server detached
226 if (!cnt && (ct_seg->flags & CT_SEGMENT_F_CLIENT_DETACHED) &&
227 (ct_seg->flags & CT_SEGMENT_F_SERVER_DETACHED))
229 pool_put_index (seg_ctx->segments, ct->ct_seg_index);
232 * No more segment indices left, remove the segments context
234 if (!pool_elts (seg_ctx->segments))
236 u64 table_handle = seg_ctx->client_wrk << 16 | seg_ctx->server_wrk;
237 table_handle = (u64) seg_ctx->sm_index << 32 | table_handle;
238 hash_unset (cm->app_segs_ctxs_table, table_handle);
239 pool_free (seg_ctx->segments);
240 pool_put_index (cm->app_seg_ctxs, ct->seg_ctx_index);
245 clib_rwlock_writer_unlock (&cm->app_segs_lock);
248 * Session counter went to zero, notify the app that detached
253 if (ct->flags & CT_CONN_F_CLIENT)
255 app_wrk = app_worker_get_if_valid (ct->client_wrk);
256 /* Determine if client app still needs notification, i.e., if it is
257 * still attached. If client detached and this is the last ct session
258 * on this segment, then its connects segment manager should also be
259 * detached, so do not send notification */
262 segment_manager_t *csm;
263 csm = app_worker_get_connect_segment_manager (app_wrk);
264 if (!segment_manager_app_detached (csm))
265 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
268 else if (!segment_manager_app_detached (sm))
270 app_wrk = app_worker_get (ct->server_wrk);
271 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
277 segment_manager_lock_and_del_segment (sm, seg_index);
279 /* Cleanup segment manager if needed. If server detaches there's a chance
280 * the client's sessions will hold up segment removal */
281 if (segment_manager_app_detached (sm) && !segment_manager_has_fifos (sm))
282 segment_manager_free_safe (sm);
286 ct_session_connect_notify (session_t *ss, session_error_t err)
288 u32 ss_index, opaque, thread_index;
289 ct_connection_t *sct, *cct;
290 app_worker_t *client_wrk;
293 ss_index = ss->session_index;
294 thread_index = ss->thread_index;
295 sct = (ct_connection_t *) session_get_transport (ss);
296 client_wrk = app_worker_get (sct->client_wrk);
297 opaque = sct->client_opaque;
299 cct = ct_connection_get (sct->peer_index, thread_index);
301 /* Client closed while waiting for reply from server */
302 if (PREDICT_FALSE (!cct))
304 session_transport_closing_notify (&sct->connection);
305 session_transport_delete_notify (&sct->connection);
306 ct_connection_free (sct);
310 session_half_open_delete_notify (&cct->connection);
311 cct->flags &= ~CT_CONN_F_HALF_OPEN;
313 if (PREDICT_FALSE (err))
317 * Alloc client session
320 cs = session_alloc (thread_index);
321 ss = session_get (ss_index, thread_index);
322 cs->session_type = ss->session_type;
323 cs->listener_handle = SESSION_INVALID_HANDLE;
324 cs->session_state = SESSION_STATE_CONNECTING;
325 cs->app_wrk_index = client_wrk->wrk_index;
326 cs->connection_index = cct->c_c_index;
327 cct->c_s_index = cs->session_index;
329 /* This will allocate fifos for the session. They won't be used for
330 * exchanging data but they will be used to close the connection if
331 * the segment manager/worker is freed */
332 if ((err = app_worker_init_connected (client_wrk, cs)))
336 err = SESSION_E_ALLOC;
340 cs->session_state = SESSION_STATE_CONNECTING;
342 if (app_worker_connect_notify (client_wrk, cs, 0, opaque))
344 segment_manager_dealloc_fifos (cs->rx_fifo, cs->tx_fifo);
350 cs = session_get (cct->c_s_index, cct->c_thread_index);
351 cs->session_state = SESSION_STATE_READY;
357 app_worker_connect_notify (client_wrk, 0, err, cct->client_opaque);
361 if (cct->client_rx_fifo)
362 ct_session_dealloc_fifos (cct, cct->client_rx_fifo, cct->client_tx_fifo);
363 ct_connection_free (cct);
367 static inline ct_segment_t *
368 ct_lookup_free_segment (ct_main_t *cm, segment_manager_t *sm,
371 uword free_bytes, max_free_bytes;
372 ct_segment_t *ct_seg, *res = 0;
373 ct_segments_ctx_t *seg_ctx;
377 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index);
378 max_free_bytes = seg_ctx->fifo_pair_bytes;
380 pool_foreach (ct_seg, seg_ctx->segments)
382 /* Client or server has detached so segment cannot be used */
383 if ((ct_seg->flags & CT_SEGMENT_F_SERVER_DETACHED) ||
384 (ct_seg->flags & CT_SEGMENT_F_CLIENT_DETACHED))
386 fs = segment_manager_get_segment (sm, ct_seg->segment_index);
387 free_bytes = fifo_segment_available_bytes (fs);
388 max_fifos = fifo_segment_size (fs) / seg_ctx->fifo_pair_bytes;
389 if (free_bytes > max_free_bytes &&
390 fifo_segment_num_fifos (fs) / 2 < max_fifos)
392 max_free_bytes = free_bytes;
400 static ct_segment_t *
401 ct_alloc_segment (ct_main_t *cm, app_worker_t *server_wrk, u64 table_handle,
402 segment_manager_t *sm, u32 client_wrk_index)
404 u32 seg_ctx_index = ~0, sm_index, pair_bytes;
405 segment_manager_props_t *props;
406 const u32 margin = 16 << 10;
407 ct_segments_ctx_t *seg_ctx;
408 app_worker_t *client_wrk;
409 u64 seg_size, seg_handle;
410 application_t *server;
411 ct_segment_t *ct_seg;
415 server = application_get (server_wrk->app_index);
416 props = application_segment_manager_properties (server);
417 sm_index = segment_manager_index (sm);
418 pair_bytes = props->rx_fifo_size + props->tx_fifo_size + margin;
421 * Make sure another thread did not alloc a segment while acquiring the lock
424 spp = hash_get (cm->app_segs_ctxs_table, table_handle);
427 seg_ctx_index = *spp;
428 ct_seg = ct_lookup_free_segment (cm, sm, seg_ctx_index);
434 * No segment, try to alloc one and notify the server and the client.
435 * Make sure the segment is not used for other fifos
437 seg_size = clib_max (props->segment_size, 128 << 20);
439 segment_manager_add_segment2 (sm, seg_size, FIFO_SEGMENT_F_CUSTOM_USE);
443 if (seg_ctx_index == ~0)
445 pool_get_zero (cm->app_seg_ctxs, seg_ctx);
446 seg_ctx_index = seg_ctx - cm->app_seg_ctxs;
447 hash_set (cm->app_segs_ctxs_table, table_handle, seg_ctx_index);
448 seg_ctx->server_wrk = server_wrk->wrk_index;
449 seg_ctx->client_wrk = client_wrk_index;
450 seg_ctx->sm_index = sm_index;
451 seg_ctx->fifo_pair_bytes = pair_bytes;
455 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index);
458 pool_get_zero (seg_ctx->segments, ct_seg);
459 ct_seg->segment_index = fs_index;
460 ct_seg->server_n_sessions = 0;
461 ct_seg->client_n_sessions = 0;
462 ct_seg->ct_seg_index = ct_seg - seg_ctx->segments;
463 ct_seg->seg_ctx_index = seg_ctx_index;
465 /* New segment, notify the server and client */
466 seg_handle = segment_manager_make_segment_handle (sm_index, fs_index);
467 if (app_worker_add_segment_notify (server_wrk, seg_handle))
470 client_wrk = app_worker_get (client_wrk_index);
471 if (app_worker_add_segment_notify (client_wrk, seg_handle))
473 app_worker_del_segment_notify (server_wrk, seg_handle);
481 segment_manager_lock_and_del_segment (sm, fs_index);
482 pool_put_index (seg_ctx->segments, ct_seg->seg_ctx_index);
487 ct_init_accepted_session (app_worker_t *server_wrk, ct_connection_t *ct,
488 session_t *ls, session_t *ll)
490 segment_manager_props_t *props;
491 u64 seg_handle, table_handle;
492 u32 sm_index, fs_index = ~0;
493 ct_segments_ctx_t *seg_ctx;
494 ct_main_t *cm = &ct_main;
495 application_t *server;
496 segment_manager_t *sm;
497 ct_segment_t *ct_seg;
502 sm = app_worker_get_listen_segment_manager (server_wrk, ll);
503 sm_index = segment_manager_index (sm);
504 server = application_get (server_wrk->app_index);
505 props = application_segment_manager_properties (server);
507 table_handle = ct->client_wrk << 16 | server_wrk->wrk_index;
508 table_handle = (u64) sm_index << 32 | table_handle;
511 * Check if we already have a segment that can hold the fifos
514 clib_rwlock_reader_lock (&cm->app_segs_lock);
516 spp = hash_get (cm->app_segs_ctxs_table, table_handle);
519 ct_seg = ct_lookup_free_segment (cm, sm, *spp);
522 ct->seg_ctx_index = ct_seg->seg_ctx_index;
523 ct->ct_seg_index = ct_seg->ct_seg_index;
524 fs_index = ct_seg->segment_index;
525 __atomic_add_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
526 __atomic_add_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
530 clib_rwlock_reader_unlock (&cm->app_segs_lock);
533 * If not, grab exclusive lock and allocate segment
537 clib_rwlock_writer_lock (&cm->app_segs_lock);
540 ct_alloc_segment (cm, server_wrk, table_handle, sm, ct->client_wrk);
543 clib_rwlock_writer_unlock (&cm->app_segs_lock);
547 ct->seg_ctx_index = ct_seg->seg_ctx_index;
548 ct->ct_seg_index = ct_seg->ct_seg_index;
549 ct_seg->server_n_sessions += 1;
550 ct_seg->client_n_sessions += 1;
551 fs_index = ct_seg->segment_index;
553 clib_rwlock_writer_unlock (&cm->app_segs_lock);
557 * Allocate and initialize the fifos
559 fs = segment_manager_get_segment_w_lock (sm, fs_index);
560 rv = segment_manager_try_alloc_fifos (
561 fs, ls->thread_index, props->rx_fifo_size, props->tx_fifo_size,
562 &ls->rx_fifo, &ls->tx_fifo);
565 segment_manager_segment_reader_unlock (sm);
567 clib_rwlock_reader_lock (&cm->app_segs_lock);
569 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
570 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
571 __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
572 __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
574 clib_rwlock_reader_unlock (&cm->app_segs_lock);
579 ls->rx_fifo->shr->master_session_index = ls->session_index;
580 ls->tx_fifo->shr->master_session_index = ls->session_index;
581 ls->rx_fifo->master_thread_index = ls->thread_index;
582 ls->tx_fifo->master_thread_index = ls->thread_index;
583 ls->rx_fifo->segment_manager = sm_index;
584 ls->tx_fifo->segment_manager = sm_index;
585 ls->rx_fifo->segment_index = fs_index;
586 ls->tx_fifo->segment_index = fs_index;
588 seg_handle = segment_manager_segment_handle (sm, fs);
589 segment_manager_segment_reader_unlock (sm);
591 ct->segment_handle = seg_handle;
597 ct_accept_rpc_wrk_handler (void *accept_args)
599 u32 cct_index, ho_index, thread_index, ll_index;
600 ct_connection_t *sct, *cct, *ho;
601 transport_connection_t *ll_ct;
602 app_worker_t *server_wrk;
606 * Alloc client ct and initialize from ho
608 thread_index = vlib_get_thread_index ();
609 cct = ct_connection_alloc (thread_index);
610 cct_index = cct->c_c_index;
612 ho_index = pointer_to_uword (accept_args);
613 ho = ct_connection_get (ho_index, 0);
615 /* Unlikely but half-open session and transport could have been freed */
616 if (PREDICT_FALSE (!ho))
618 ct_connection_free (cct);
622 clib_memcpy (cct, ho, sizeof (*ho));
623 cct->c_c_index = cct_index;
624 cct->c_thread_index = thread_index;
625 cct->flags |= CT_CONN_F_HALF_OPEN;
627 /* Notify session layer that half-open is on a different thread
628 * and mark ho connection index reusable. Avoids another rpc
630 session_half_open_migrate_notify (&cct->connection);
631 session_half_open_migrated_notify (&cct->connection);
632 ct_half_open_add_reusable (ho_index);
635 * Alloc and init server transport
638 ll_index = cct->peer_index;
639 ll = listen_session_get (ll_index);
640 sct = ct_connection_alloc (thread_index);
641 /* Transport not necessarily ct but it might, so grab after sct alloc */
642 ll_ct = listen_session_get_transport (ll);
644 /* Make sure cct is valid after sct alloc */
645 cct = ct_connection_get (cct_index, thread_index);
648 sct->c_lcl_port = ll_ct->lcl_port;
649 sct->c_is_ip4 = cct->c_is_ip4;
650 clib_memcpy (&sct->c_lcl_ip, &cct->c_rmt_ip, sizeof (cct->c_rmt_ip));
651 sct->client_wrk = cct->client_wrk;
652 sct->c_proto = TRANSPORT_PROTO_NONE;
653 sct->client_opaque = cct->client_opaque;
654 sct->actual_tp = cct->actual_tp;
656 sct->peer_index = cct->c_c_index;
657 cct->peer_index = sct->c_c_index;
660 * Accept server session. Client session is created only after
661 * server confirms accept.
663 ss = session_alloc (thread_index);
664 ll = listen_session_get (ll_index);
665 ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE,
667 ss->connection_index = sct->c_c_index;
668 ss->listener_handle = listen_session_get_handle (ll);
669 ss->session_state = SESSION_STATE_CREATED;
671 server_wrk = application_listener_select_worker (ll);
672 ss->app_wrk_index = server_wrk->wrk_index;
674 sct->c_s_index = ss->session_index;
675 sct->server_wrk = ss->app_wrk_index;
677 if (ct_init_accepted_session (server_wrk, sct, ss, ll))
679 ct_session_connect_notify (ss, SESSION_E_ALLOC);
680 ct_connection_free (sct);
685 cct->seg_ctx_index = sct->seg_ctx_index;
686 cct->ct_seg_index = sct->ct_seg_index;
687 cct->client_rx_fifo = ss->tx_fifo;
688 cct->client_tx_fifo = ss->rx_fifo;
689 cct->client_rx_fifo->refcnt++;
690 cct->client_tx_fifo->refcnt++;
691 cct->segment_handle = sct->segment_handle;
693 ss->session_state = SESSION_STATE_ACCEPTING;
694 if (app_worker_accept_notify (server_wrk, ss))
696 ct_session_connect_notify (ss, SESSION_E_REFUSED);
697 ct_session_dealloc_fifos (sct, ss->rx_fifo, ss->tx_fifo);
698 ct_connection_free (sct);
704 ct_connect (app_worker_t * client_wrk, session_t * ll,
705 session_endpoint_cfg_t * sep)
707 u32 thread_index, ho_index;
708 ct_main_t *cm = &ct_main;
711 /* Simple round-robin policy for spreading sessions over workers. We skip
712 * thread index 0, i.e., offset the index by 1, when we have workers as it
713 * is the one dedicated to main thread. Note that n_workers does not include
716 thread_index = cm->n_workers ? (cm->n_sessions % cm->n_workers) + 1 : 0;
719 * Alloc and init client half-open transport
722 ho = ct_half_open_alloc ();
723 ho_index = ho->c_c_index;
724 ho->c_rmt_port = sep->port;
726 ho->c_is_ip4 = sep->is_ip4;
727 ho->client_opaque = sep->opaque;
728 ho->client_wrk = client_wrk->wrk_index;
729 ho->peer_index = ll->session_index;
730 ho->c_proto = TRANSPORT_PROTO_NONE;
731 ho->c_flags |= TRANSPORT_CONNECTION_F_NO_LOOKUP;
732 clib_memcpy (&ho->c_rmt_ip, &sep->ip, sizeof (sep->ip));
733 ho->flags |= CT_CONN_F_CLIENT;
735 ho->actual_tp = sep->original_tp;
738 * Accept connection on thread selected above. Connected reply comes
739 * after server accepts the connection.
742 session_send_rpc_evt_to_thread_force (thread_index,
743 ct_accept_rpc_wrk_handler,
744 uword_to_pointer (ho_index, void *));
750 ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
752 session_endpoint_cfg_t *sep;
755 sep = (session_endpoint_cfg_t *) tep;
756 ct = ct_connection_alloc (0);
757 ct->server_wrk = sep->app_wrk_index;
758 ct->c_is_ip4 = sep->is_ip4;
759 clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip));
760 ct->c_lcl_port = sep->port;
761 ct->c_s_index = app_listener_index;
762 ct->actual_tp = sep->transport_proto;
763 return ct->c_c_index;
767 ct_stop_listen (u32 ct_index)
770 ct = ct_connection_get (ct_index, 0);
771 ct_connection_free (ct);
775 static transport_connection_t *
776 ct_listener_get (u32 ct_index)
778 return (transport_connection_t *) ct_connection_get (ct_index, 0);
781 static transport_connection_t *
782 ct_half_open_get (u32 ct_index)
784 return (transport_connection_t *) ct_connection_get (ct_index, 0);
788 ct_session_cleanup (u32 conn_index, u32 thread_index)
790 ct_connection_t *ct, *peer_ct;
792 ct = ct_connection_get (conn_index, thread_index);
796 peer_ct = ct_connection_get (ct->peer_index, thread_index);
798 peer_ct->peer_index = ~0;
800 ct_connection_free (ct);
804 ct_cleanup_ho (u32 ho_index)
806 ct_connection_free (ct_connection_get (ho_index, 0));
810 ct_session_connect (transport_endpoint_cfg_t * tep)
812 session_endpoint_cfg_t *sep_ext;
813 session_endpoint_t _sep, *sep = &_sep;
814 app_worker_t *app_wrk;
822 sep_ext = (session_endpoint_cfg_t *) tep;
823 _sep = *(session_endpoint_t *) tep;
824 app_wrk = app_worker_get (sep_ext->app_wrk_index);
825 app = application_get (app_wrk->app_index);
827 sep->transport_proto = sep_ext->original_tp;
828 table_index = application_local_session_table (app);
829 lh = session_lookup_local_endpoint (table_index, sep);
830 if (lh == SESSION_DROP_HANDLE)
831 return SESSION_E_FILTERED;
833 if (lh == SESSION_INVALID_HANDLE)
836 ll = listen_session_get_from_handle (lh);
837 al = app_listener_get_w_session (ll);
840 * Break loop if rule in local table points to connecting app. This
841 * can happen if client is a generic proxy. Route connect through
842 * global table instead.
844 if (al->app_index == app->app_index)
847 return ct_connect (app_wrk, ll, sep_ext);
850 * If nothing found, check the global scope for locally attached
851 * destinations. Make sure first that we're allowed to.
855 if (session_endpoint_is_local (sep))
856 return SESSION_E_NOROUTE;
858 if (!application_has_global_scope (app))
859 return SESSION_E_SCOPE;
861 fib_proto = session_endpoint_fib_proto (sep);
862 table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index);
863 ll = session_lookup_listener_wildcard (table_index, sep);
865 /* Avoid connecting app to own listener */
866 if (ll && ll->app_index != app->app_index)
867 return ct_connect (app_wrk, ll, sep_ext);
869 /* Failed to connect but no error */
870 return SESSION_E_LOCAL_CONNECT;
874 ct_session_postponed_cleanup (ct_connection_t *ct)
876 app_worker_t *app_wrk;
879 s = session_get (ct->c_s_index, ct->c_thread_index);
880 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
882 if (ct->flags & CT_CONN_F_CLIENT)
885 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT);
887 /* Normal free for client session as the fifos are allocated through
888 * the connects segment manager in a segment that's not shared with
890 session_free_w_fifos (s);
891 ct_session_dealloc_fifos (ct, ct->client_rx_fifo, ct->client_tx_fifo);
895 /* Manual session and fifo segment cleanup to avoid implicit
896 * segment manager cleanups and notifications */
897 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
900 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT);
901 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_SESSION);
904 ct_session_dealloc_fifos (ct, s->rx_fifo, s->tx_fifo);
908 ct_connection_free (ct);
912 ct_handle_cleanups (void *args)
914 uword thread_index = pointer_to_uword (args);
915 const u32 max_cleanups = 100;
916 ct_main_t *cm = &ct_main;
917 ct_cleanup_req_t *req;
922 cm->heave_cleanups[thread_index] = 0;
923 n_to_handle = clib_fifo_elts (cm->pending_cleanups[thread_index]);
924 n_to_handle = clib_min (n_to_handle, max_cleanups);
928 clib_fifo_sub2 (cm->pending_cleanups[thread_index], req);
929 ct = ct_connection_get (req->ct_index, thread_index);
930 s = session_get (ct->c_s_index, ct->c_thread_index);
931 if (!svm_fifo_has_event (s->tx_fifo))
932 ct_session_postponed_cleanup (ct);
934 clib_fifo_add1 (cm->pending_cleanups[thread_index], *req);
938 if (clib_fifo_elts (cm->pending_cleanups[thread_index]))
940 cm->heave_cleanups[thread_index] = 1;
941 session_send_rpc_evt_to_thread_force (
942 thread_index, ct_handle_cleanups,
943 uword_to_pointer (thread_index, void *));
948 ct_program_cleanup (ct_connection_t *ct)
950 ct_main_t *cm = &ct_main;
951 ct_cleanup_req_t *req;
954 thread_index = ct->c_thread_index;
955 clib_fifo_add2 (cm->pending_cleanups[thread_index], req);
956 req->ct_index = ct->c_c_index;
958 if (cm->heave_cleanups[thread_index])
961 cm->heave_cleanups[thread_index] = 1;
962 session_send_rpc_evt_to_thread_force (
963 thread_index, ct_handle_cleanups, uword_to_pointer (thread_index, void *));
967 ct_close_is_reset (ct_connection_t *ct, session_t *s)
969 if (ct->flags & CT_CONN_F_CLIENT)
970 return (svm_fifo_max_dequeue (ct->client_rx_fifo) > 0);
972 return (svm_fifo_max_dequeue (s->rx_fifo) > 0);
976 ct_session_close (u32 ct_index, u32 thread_index)
978 ct_connection_t *ct, *peer_ct;
981 ct = ct_connection_get (ct_index, thread_index);
982 s = session_get (ct->c_s_index, ct->c_thread_index);
983 peer_ct = ct_connection_get (ct->peer_index, thread_index);
986 peer_ct->peer_index = ~0;
987 /* Make sure session was allocated */
988 if (peer_ct->flags & CT_CONN_F_HALF_OPEN)
990 ct_session_connect_notify (s, SESSION_E_REFUSED);
992 else if (peer_ct->c_s_index != ~0)
994 if (ct_close_is_reset (ct, s))
995 session_transport_reset_notify (&peer_ct->connection);
997 session_transport_closing_notify (&peer_ct->connection);
1001 /* should not happen */
1002 clib_warning ("ct peer without session");
1003 ct_connection_free (peer_ct);
1007 /* Do not send closed notify to make sure pending tx events are
1008 * still delivered and program cleanup */
1009 ct_program_cleanup (ct);
1012 static transport_connection_t *
1013 ct_session_get (u32 ct_index, u32 thread_index)
1015 return (transport_connection_t *) ct_connection_get (ct_index,
1020 format_ct_connection_id (u8 * s, va_list * args)
1022 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
1027 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
1028 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
1029 format_ip4_address, &ct->c_lcl_ip4,
1030 clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address,
1031 &ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port));
1035 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
1036 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
1037 format_ip6_address, &ct->c_lcl_ip6,
1038 clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address,
1039 &ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port));
1046 ct_custom_tx (void *session, transport_send_params_t * sp)
1048 session_t *s = (session_t *) session;
1049 if (session_has_transport (s))
1051 /* If event enqueued towards peer, remove from scheduler and remove
1052 * session tx flag, i.e., accept new tx events. Unset fifo flag now to
1053 * avoid missing events if peer did not clear fifo flag yet, which is
1054 * interpreted as successful notification and session is descheduled. */
1055 svm_fifo_unset_event (s->tx_fifo);
1056 if (!ct_session_tx (s))
1057 sp->flags = TRANSPORT_SND_F_DESCHED;
1059 /* The scheduler uses packet count as a means of upper bounding the amount
1060 * of work done per dispatch. So make it look like we have sent something */
1065 ct_app_rx_evt (transport_connection_t * tc)
1067 ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct;
1070 peer_ct = ct_connection_get (ct->peer_index, tc->thread_index);
1073 ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
1074 return session_dequeue_notify (ps);
1078 format_ct_listener (u8 * s, va_list * args)
1080 u32 tc_index = va_arg (*args, u32);
1081 u32 __clib_unused thread_index = va_arg (*args, u32);
1082 u32 __clib_unused verbose = va_arg (*args, u32);
1083 ct_connection_t *ct = ct_connection_get (tc_index, 0);
1084 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1086 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "LISTEN");
1091 format_ct_half_open (u8 *s, va_list *args)
1093 u32 ho_index = va_arg (*args, u32);
1094 u32 verbose = va_arg (*args, u32);
1095 ct_connection_t *ct = ct_connection_get (ho_index, 0);
1096 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1098 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "HALF-OPEN");
1103 format_ct_connection (u8 * s, va_list * args)
1105 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
1106 u32 verbose = va_arg (*args, u32);
1110 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1113 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "ESTABLISHED");
1116 s = format (s, "\n");
1123 format_ct_session (u8 * s, va_list * args)
1125 u32 ct_index = va_arg (*args, u32);
1126 u32 thread_index = va_arg (*args, u32);
1127 u32 verbose = va_arg (*args, u32);
1128 ct_connection_t *ct;
1130 ct = ct_connection_get (ct_index, thread_index);
1133 s = format (s, "empty\n");
1137 s = format (s, "%U", format_ct_connection, ct, verbose);
1142 ct_enable_disable (vlib_main_t * vm, u8 is_en)
1144 ct_main_t *cm = &ct_main;
1146 cm->n_workers = vlib_num_workers ();
1147 vec_validate (cm->connections, cm->n_workers);
1148 vec_validate (cm->pending_cleanups, cm->n_workers);
1149 vec_validate (cm->heave_cleanups, cm->n_workers);
1150 clib_spinlock_init (&cm->ho_reuseable_lock);
1151 clib_rwlock_init (&cm->app_segs_lock);
1156 static const transport_proto_vft_t cut_thru_proto = {
1157 .enable = ct_enable_disable,
1158 .start_listen = ct_start_listen,
1159 .stop_listen = ct_stop_listen,
1160 .get_connection = ct_session_get,
1161 .get_listener = ct_listener_get,
1162 .get_half_open = ct_half_open_get,
1163 .cleanup = ct_session_cleanup,
1164 .cleanup_ho = ct_cleanup_ho,
1165 .connect = ct_session_connect,
1166 .close = ct_session_close,
1167 .custom_tx = ct_custom_tx,
1168 .app_rx_evt = ct_app_rx_evt,
1169 .format_listener = format_ct_listener,
1170 .format_half_open = format_ct_half_open,
1171 .format_connection = format_ct_session,
1172 .transport_options = {
1175 .tx_type = TRANSPORT_TX_INTERNAL,
1176 .service_type = TRANSPORT_SERVICE_VC,
1182 ct_session_tx (session_t * s)
1184 ct_connection_t *ct, *peer_ct;
1187 ct = (ct_connection_t *) session_get_transport (s);
1188 peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index);
1191 peer_s = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
1192 if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
1194 return session_enqueue_notify (peer_s);
1197 static clib_error_t *
1198 ct_transport_init (vlib_main_t * vm)
1200 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
1201 FIB_PROTOCOL_IP4, ~0);
1202 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
1203 FIB_PROTOCOL_IP6, ~0);
1207 VLIB_INIT_FUNCTION (ct_transport_init);
1210 * fd.io coding-style-patch-verification: ON
1213 * eval: (c-set-style "gnu")