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_worker_
51 ct_connection_t *connections; /**< Per-worker connection pools */
52 u32 *pending_connects; /**< Fifo of pending ho indices */
53 ct_cleanup_req_t *pending_cleanups; /**< Fifo of pending indices */
54 u8 have_connects; /**< Set if connect rpc pending */
55 u8 have_cleanups; /**< Set if cleanup rpc pending */
58 typedef struct ct_main_
60 ct_worker_t *wrk; /**< Per-worker state */
61 u32 n_workers; /**< Number of vpp workers */
62 u32 n_sessions; /**< Cumulative sessions counter */
63 u32 *ho_reusable; /**< Vector of reusable ho indices */
64 clib_spinlock_t ho_reuseable_lock; /**< Lock for reusable ho indices */
65 clib_rwlock_t app_segs_lock; /**< RW lock for seg contexts */
66 uword *app_segs_ctxs_table; /**< App handle to segment pool map */
67 ct_segments_ctx_t *app_seg_ctxs; /**< Pool of ct segment contexts */
70 static ct_main_t ct_main;
72 static inline ct_worker_t *
73 ct_worker_get (u32 thread_index)
75 return &ct_main.wrk[thread_index];
78 static ct_connection_t *
79 ct_connection_alloc (u32 thread_index)
81 ct_worker_t *wrk = ct_worker_get (thread_index);
84 pool_get_zero (wrk->connections, ct);
85 ct->c_c_index = ct - wrk->connections;
86 ct->c_thread_index = thread_index;
89 ct->seg_ctx_index = ~0;
90 ct->ct_seg_index = ~0;
94 static ct_connection_t *
95 ct_connection_get (u32 ct_index, u32 thread_index)
97 ct_worker_t *wrk = ct_worker_get (thread_index);
99 if (pool_is_free_index (wrk->connections, ct_index))
101 return pool_elt_at_index (wrk->connections, ct_index);
105 ct_connection_free (ct_connection_t * ct)
107 ct_worker_t *wrk = ct_worker_get (ct->c_thread_index);
111 clib_memset (ct, 0xfc, sizeof (*ct));
112 pool_put (wrk->connections, ct);
115 pool_put (wrk->connections, ct);
118 static ct_connection_t *
119 ct_half_open_alloc (void)
121 ct_main_t *cm = &ct_main;
124 clib_spinlock_lock (&cm->ho_reuseable_lock);
125 vec_foreach (hip, cm->ho_reusable)
126 pool_put_index (cm->wrk[0].connections, *hip);
127 vec_reset_length (cm->ho_reusable);
128 clib_spinlock_unlock (&cm->ho_reuseable_lock);
130 return ct_connection_alloc (0);
134 ct_half_open_add_reusable (u32 ho_index)
136 ct_main_t *cm = &ct_main;
138 clib_spinlock_lock (&cm->ho_reuseable_lock);
139 vec_add1 (cm->ho_reusable, ho_index);
140 clib_spinlock_unlock (&cm->ho_reuseable_lock);
144 ct_session_get_peer (session_t * s)
146 ct_connection_t *ct, *peer_ct;
147 ct = ct_connection_get (s->connection_index, s->thread_index);
148 peer_ct = ct_connection_get (ct->peer_index, s->thread_index);
149 return session_get (peer_ct->c_s_index, s->thread_index);
153 ct_session_endpoint (session_t * ll, session_endpoint_t * sep)
156 ct = (ct_connection_t *) session_get_transport (ll);
157 sep->transport_proto = ct->actual_tp;
158 sep->port = ct->c_lcl_port;
159 sep->is_ip4 = ct->c_is_ip4;
160 ip_copy (&sep->ip, &ct->c_lcl_ip, ct->c_is_ip4);
164 ct_set_invalid_app_wrk (ct_connection_t *ct, u8 is_client)
166 ct_connection_t *peer_ct;
168 peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index);
172 ct->client_wrk = APP_INVALID_INDEX;
174 ct->client_wrk = APP_INVALID_INDEX;
178 ct->server_wrk = APP_INVALID_INDEX;
180 ct->server_wrk = APP_INVALID_INDEX;
185 ct_session_dealloc_fifos (ct_connection_t *ct, svm_fifo_t *rx_fifo,
188 ct_segments_ctx_t *seg_ctx;
189 ct_main_t *cm = &ct_main;
190 segment_manager_t *sm;
191 app_worker_t *app_wrk;
192 ct_segment_t *ct_seg;
202 sm = segment_manager_get (rx_fifo->segment_manager);
203 seg_index = rx_fifo->segment_index;
205 fs = segment_manager_get_segment_w_lock (sm, seg_index);
206 fifo_segment_free_fifo (fs, rx_fifo);
207 fifo_segment_free_fifo (fs, tx_fifo);
208 segment_manager_segment_reader_unlock (sm);
211 * Atomically update segment context with readers lock
214 clib_rwlock_reader_lock (&cm->app_segs_lock);
216 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
217 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
219 if (ct->flags & CT_CONN_F_CLIENT)
222 __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
227 __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
230 clib_rwlock_reader_unlock (&cm->app_segs_lock);
233 * No need to do any app updates, return
240 * Grab exclusive lock and update flags unless some other thread
241 * added more sessions
243 clib_rwlock_writer_lock (&cm->app_segs_lock);
245 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
246 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
247 if (ct->flags & CT_CONN_F_CLIENT)
249 cnt = ct_seg->client_n_sessions;
252 ct_seg->flags |= CT_SEGMENT_F_CLIENT_DETACHED;
253 s = session_get (ct->c_s_index, ct->c_thread_index);
254 if (s->app_wrk_index == APP_INVALID_INDEX)
255 ct_set_invalid_app_wrk (ct, 1 /* is_client */);
259 cnt = ct_seg->server_n_sessions;
262 ct_seg->flags |= CT_SEGMENT_F_SERVER_DETACHED;
263 s = session_get (ct->c_s_index, ct->c_thread_index);
264 if (s->app_wrk_index == APP_INVALID_INDEX)
265 ct_set_invalid_app_wrk (ct, 0 /* is_client */);
268 if (!(ct_seg->flags & CT_SEGMENT_F_CLIENT_DETACHED) ||
269 !(ct_seg->flags & CT_SEGMENT_F_SERVER_DETACHED))
273 * Remove segment context because both client and server detached
276 pool_put_index (seg_ctx->segments, ct->ct_seg_index);
279 * No more segment indices left, remove the segments context
281 if (!pool_elts (seg_ctx->segments))
283 u64 table_handle = seg_ctx->client_wrk << 16 | seg_ctx->server_wrk;
284 table_handle = (u64) seg_ctx->sm_index << 32 | table_handle;
285 hash_unset (cm->app_segs_ctxs_table, table_handle);
286 pool_free (seg_ctx->segments);
287 pool_put_index (cm->app_seg_ctxs, ct->seg_ctx_index);
291 * Segment to be removed so notify both apps
294 app_wrk = app_worker_get_if_valid (ct->client_wrk);
295 /* Determine if client app still needs notification, i.e., if it is
296 * still attached. If client detached and this is the last ct session
297 * on this segment, then its connects segment manager should also be
298 * detached, so do not send notification */
301 segment_manager_t *csm;
302 csm = app_worker_get_connect_segment_manager (app_wrk);
303 if (!segment_manager_app_detached (csm))
304 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
307 if (!segment_manager_app_detached (sm))
309 app_wrk = app_worker_get (ct->server_wrk);
310 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
313 segment_manager_lock_and_del_segment (sm, seg_index);
315 /* Cleanup segment manager if needed. If server detaches there's a chance
316 * the client's sessions will hold up segment removal */
317 if (segment_manager_app_detached (sm) && !segment_manager_has_fifos (sm))
318 segment_manager_free_safe (sm);
322 clib_rwlock_writer_unlock (&cm->app_segs_lock);
326 ct_session_connect_notify (session_t *ss, session_error_t err)
328 u32 ss_index, opaque, thread_index;
329 ct_connection_t *sct, *cct;
330 app_worker_t *client_wrk;
333 ss_index = ss->session_index;
334 thread_index = ss->thread_index;
335 sct = (ct_connection_t *) session_get_transport (ss);
336 client_wrk = app_worker_get (sct->client_wrk);
337 opaque = sct->client_opaque;
339 cct = ct_connection_get (sct->peer_index, thread_index);
341 /* Client closed while waiting for reply from server */
342 if (PREDICT_FALSE (!cct))
344 session_transport_closing_notify (&sct->connection);
345 session_transport_delete_notify (&sct->connection);
346 ct_connection_free (sct);
350 session_half_open_delete_notify (&cct->connection);
351 cct->flags &= ~CT_CONN_F_HALF_OPEN;
353 if (PREDICT_FALSE (err))
357 * Alloc client session
360 cs = session_alloc (thread_index);
361 ss = session_get (ss_index, thread_index);
362 cs->session_type = ss->session_type;
363 cs->listener_handle = SESSION_INVALID_HANDLE;
364 cs->session_state = SESSION_STATE_CONNECTING;
365 cs->app_wrk_index = client_wrk->wrk_index;
366 cs->connection_index = cct->c_c_index;
367 cct->c_s_index = cs->session_index;
369 /* This will allocate fifos for the session. They won't be used for
370 * exchanging data but they will be used to close the connection if
371 * the segment manager/worker is freed */
372 if ((err = app_worker_init_connected (client_wrk, cs)))
376 err = SESSION_E_ALLOC;
380 cs->session_state = SESSION_STATE_CONNECTING;
382 if (app_worker_connect_notify (client_wrk, cs, 0, opaque))
384 segment_manager_dealloc_fifos (cs->rx_fifo, cs->tx_fifo);
390 cs = session_get (cct->c_s_index, cct->c_thread_index);
391 cs->session_state = SESSION_STATE_READY;
397 app_worker_connect_notify (client_wrk, 0, err, cct->client_opaque);
401 if (cct->client_rx_fifo)
402 ct_session_dealloc_fifos (cct, cct->client_rx_fifo, cct->client_tx_fifo);
403 ct_connection_free (cct);
407 static inline ct_segment_t *
408 ct_lookup_free_segment (ct_main_t *cm, segment_manager_t *sm,
411 uword free_bytes, max_free_bytes;
412 ct_segment_t *ct_seg, *res = 0;
413 ct_segments_ctx_t *seg_ctx;
417 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index);
418 max_free_bytes = seg_ctx->fifo_pair_bytes;
420 pool_foreach (ct_seg, seg_ctx->segments)
422 /* Client or server has detached so segment cannot be used */
423 fs = segment_manager_get_segment (sm, ct_seg->segment_index);
424 free_bytes = fifo_segment_available_bytes (fs);
425 max_fifos = fifo_segment_size (fs) / seg_ctx->fifo_pair_bytes;
426 if (free_bytes > max_free_bytes &&
427 fifo_segment_num_fifos (fs) / 2 < max_fifos)
429 max_free_bytes = free_bytes;
437 static ct_segment_t *
438 ct_alloc_segment (ct_main_t *cm, app_worker_t *server_wrk, u64 table_handle,
439 segment_manager_t *sm, u32 client_wrk_index)
441 u32 seg_ctx_index = ~0, sm_index, pair_bytes;
442 segment_manager_props_t *props;
443 const u32 margin = 16 << 10;
444 ct_segments_ctx_t *seg_ctx;
445 app_worker_t *client_wrk;
446 u64 seg_size, seg_handle;
447 application_t *server;
448 ct_segment_t *ct_seg;
452 server = application_get (server_wrk->app_index);
453 props = application_segment_manager_properties (server);
454 sm_index = segment_manager_index (sm);
455 pair_bytes = props->rx_fifo_size + props->tx_fifo_size + margin;
458 * Make sure another thread did not alloc a segment while acquiring the lock
461 spp = hash_get (cm->app_segs_ctxs_table, table_handle);
464 seg_ctx_index = *spp;
465 ct_seg = ct_lookup_free_segment (cm, sm, seg_ctx_index);
471 * No segment, try to alloc one and notify the server and the client.
472 * Make sure the segment is not used for other fifos
474 seg_size = clib_max (props->segment_size, 128 << 20);
476 segment_manager_add_segment2 (sm, seg_size, FIFO_SEGMENT_F_CUSTOM_USE);
480 if (seg_ctx_index == ~0)
482 pool_get_zero (cm->app_seg_ctxs, seg_ctx);
483 seg_ctx_index = seg_ctx - cm->app_seg_ctxs;
484 hash_set (cm->app_segs_ctxs_table, table_handle, seg_ctx_index);
485 seg_ctx->server_wrk = server_wrk->wrk_index;
486 seg_ctx->client_wrk = client_wrk_index;
487 seg_ctx->sm_index = sm_index;
488 seg_ctx->fifo_pair_bytes = pair_bytes;
492 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index);
495 pool_get_zero (seg_ctx->segments, ct_seg);
496 ct_seg->segment_index = fs_index;
497 ct_seg->server_n_sessions = 0;
498 ct_seg->client_n_sessions = 0;
499 ct_seg->ct_seg_index = ct_seg - seg_ctx->segments;
500 ct_seg->seg_ctx_index = seg_ctx_index;
502 /* New segment, notify the server and client */
503 seg_handle = segment_manager_make_segment_handle (sm_index, fs_index);
504 if (app_worker_add_segment_notify (server_wrk, seg_handle))
507 client_wrk = app_worker_get (client_wrk_index);
508 if (app_worker_add_segment_notify (client_wrk, seg_handle))
510 app_worker_del_segment_notify (server_wrk, seg_handle);
518 segment_manager_lock_and_del_segment (sm, fs_index);
519 pool_put_index (seg_ctx->segments, ct_seg->seg_ctx_index);
524 ct_init_accepted_session (app_worker_t *server_wrk, ct_connection_t *ct,
525 session_t *ls, session_t *ll)
527 segment_manager_props_t *props;
528 u64 seg_handle, table_handle;
529 u32 sm_index, fs_index = ~0;
530 ct_segments_ctx_t *seg_ctx;
531 ct_main_t *cm = &ct_main;
532 application_t *server;
533 segment_manager_t *sm;
534 ct_segment_t *ct_seg;
539 sm = app_worker_get_listen_segment_manager (server_wrk, ll);
540 sm_index = segment_manager_index (sm);
541 server = application_get (server_wrk->app_index);
542 props = application_segment_manager_properties (server);
544 table_handle = ct->client_wrk << 16 | server_wrk->wrk_index;
545 table_handle = (u64) sm_index << 32 | table_handle;
548 * Check if we already have a segment that can hold the fifos
551 clib_rwlock_reader_lock (&cm->app_segs_lock);
553 spp = hash_get (cm->app_segs_ctxs_table, table_handle);
556 ct_seg = ct_lookup_free_segment (cm, sm, *spp);
559 ct->seg_ctx_index = ct_seg->seg_ctx_index;
560 ct->ct_seg_index = ct_seg->ct_seg_index;
561 fs_index = ct_seg->segment_index;
563 ~(CT_SEGMENT_F_SERVER_DETACHED | CT_SEGMENT_F_CLIENT_DETACHED);
564 __atomic_add_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
565 __atomic_add_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
569 clib_rwlock_reader_unlock (&cm->app_segs_lock);
572 * If not, grab exclusive lock and allocate segment
576 clib_rwlock_writer_lock (&cm->app_segs_lock);
579 ct_alloc_segment (cm, server_wrk, table_handle, sm, ct->client_wrk);
582 clib_rwlock_writer_unlock (&cm->app_segs_lock);
586 ct->seg_ctx_index = ct_seg->seg_ctx_index;
587 ct->ct_seg_index = ct_seg->ct_seg_index;
588 ct_seg->server_n_sessions += 1;
589 ct_seg->client_n_sessions += 1;
590 fs_index = ct_seg->segment_index;
592 clib_rwlock_writer_unlock (&cm->app_segs_lock);
596 * Allocate and initialize the fifos
598 fs = segment_manager_get_segment_w_lock (sm, fs_index);
599 rv = segment_manager_try_alloc_fifos (
600 fs, ls->thread_index, props->rx_fifo_size, props->tx_fifo_size,
601 &ls->rx_fifo, &ls->tx_fifo);
604 segment_manager_segment_reader_unlock (sm);
606 clib_rwlock_reader_lock (&cm->app_segs_lock);
608 seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index);
609 ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index);
610 __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED);
611 __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED);
613 clib_rwlock_reader_unlock (&cm->app_segs_lock);
618 ls->rx_fifo->shr->master_session_index = ls->session_index;
619 ls->tx_fifo->shr->master_session_index = ls->session_index;
620 ls->rx_fifo->master_thread_index = ls->thread_index;
621 ls->tx_fifo->master_thread_index = ls->thread_index;
622 ls->rx_fifo->segment_manager = sm_index;
623 ls->tx_fifo->segment_manager = sm_index;
624 ls->rx_fifo->segment_index = fs_index;
625 ls->tx_fifo->segment_index = fs_index;
627 seg_handle = segment_manager_segment_handle (sm, fs);
628 segment_manager_segment_reader_unlock (sm);
630 ct->segment_handle = seg_handle;
636 ct_accept_one (u32 thread_index, u32 ho_index)
638 ct_connection_t *sct, *cct, *ho;
639 transport_connection_t *ll_ct;
640 app_worker_t *server_wrk;
641 u32 cct_index, ll_index;
645 * Alloc client ct and initialize from ho
647 cct = ct_connection_alloc (thread_index);
648 cct_index = cct->c_c_index;
650 ho = ct_connection_get (ho_index, 0);
652 /* Unlikely but half-open session and transport could have been freed */
653 if (PREDICT_FALSE (!ho))
655 ct_connection_free (cct);
659 clib_memcpy (cct, ho, sizeof (*ho));
660 cct->c_c_index = cct_index;
661 cct->c_thread_index = thread_index;
662 cct->flags |= CT_CONN_F_HALF_OPEN;
664 /* Notify session layer that half-open is on a different thread
665 * and mark ho connection index reusable. Avoids another rpc
667 session_half_open_migrate_notify (&cct->connection);
668 session_half_open_migrated_notify (&cct->connection);
669 ct_half_open_add_reusable (ho_index);
672 * Alloc and init server transport
675 ll_index = cct->peer_index;
676 ll = listen_session_get (ll_index);
677 sct = ct_connection_alloc (thread_index);
678 /* Transport not necessarily ct but it might, so grab after sct alloc */
679 ll_ct = listen_session_get_transport (ll);
681 /* Make sure cct is valid after sct alloc */
682 cct = ct_connection_get (cct_index, thread_index);
685 sct->c_lcl_port = ll_ct->lcl_port;
686 sct->c_is_ip4 = cct->c_is_ip4;
687 clib_memcpy (&sct->c_lcl_ip, &cct->c_rmt_ip, sizeof (cct->c_rmt_ip));
688 sct->client_wrk = cct->client_wrk;
689 sct->c_proto = TRANSPORT_PROTO_NONE;
690 sct->client_opaque = cct->client_opaque;
691 sct->actual_tp = cct->actual_tp;
693 sct->peer_index = cct->c_c_index;
694 cct->peer_index = sct->c_c_index;
697 * Accept server session. Client session is created only after
698 * server confirms accept.
700 ss = session_alloc (thread_index);
701 ll = listen_session_get (ll_index);
702 ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE,
704 ss->connection_index = sct->c_c_index;
705 ss->listener_handle = listen_session_get_handle (ll);
706 ss->session_state = SESSION_STATE_CREATED;
708 server_wrk = application_listener_select_worker (ll);
709 ss->app_wrk_index = server_wrk->wrk_index;
711 sct->c_s_index = ss->session_index;
712 sct->server_wrk = ss->app_wrk_index;
714 if (ct_init_accepted_session (server_wrk, sct, ss, ll))
716 ct_session_connect_notify (ss, SESSION_E_ALLOC);
717 ct_connection_free (sct);
722 cct->server_wrk = sct->server_wrk;
723 cct->seg_ctx_index = sct->seg_ctx_index;
724 cct->ct_seg_index = sct->ct_seg_index;
725 cct->client_rx_fifo = ss->tx_fifo;
726 cct->client_tx_fifo = ss->rx_fifo;
727 cct->client_rx_fifo->refcnt++;
728 cct->client_tx_fifo->refcnt++;
729 cct->segment_handle = sct->segment_handle;
731 ss->session_state = SESSION_STATE_ACCEPTING;
732 if (app_worker_accept_notify (server_wrk, ss))
734 ct_session_connect_notify (ss, SESSION_E_REFUSED);
735 ct_session_dealloc_fifos (sct, ss->rx_fifo, ss->tx_fifo);
736 ct_connection_free (sct);
742 ct_accept_rpc_wrk_handler (void *rpc_args)
744 u32 thread_index, ho_index, n_connects, i, n_pending;
745 const u32 max_connects = 32;
748 thread_index = pointer_to_uword (rpc_args);
749 wrk = ct_worker_get (thread_index);
751 /* Sub without lock as main enqueues with worker barrier */
752 n_pending = clib_fifo_elts (wrk->pending_connects);
753 n_connects = clib_min (n_pending, max_connects);
755 for (i = 0; i < n_connects; i++)
757 clib_fifo_sub1 (wrk->pending_connects, ho_index);
758 ct_accept_one (thread_index, ho_index);
761 if (n_pending == n_connects)
762 wrk->have_connects = 0;
764 session_send_rpc_evt_to_thread_force (
765 thread_index, ct_accept_rpc_wrk_handler,
766 uword_to_pointer (thread_index, void *));
770 ct_connect (app_worker_t * client_wrk, session_t * ll,
771 session_endpoint_cfg_t * sep)
773 u32 thread_index, ho_index;
774 ct_main_t *cm = &ct_main;
778 /* Simple round-robin policy for spreading sessions over workers. We skip
779 * thread index 0, i.e., offset the index by 1, when we have workers as it
780 * is the one dedicated to main thread. Note that n_workers does not include
783 thread_index = cm->n_workers ? (cm->n_sessions % cm->n_workers) + 1 : 0;
786 * Alloc and init client half-open transport
789 ho = ct_half_open_alloc ();
790 ho_index = ho->c_c_index;
791 ho->c_rmt_port = sep->port;
793 ho->c_is_ip4 = sep->is_ip4;
794 ho->client_opaque = sep->opaque;
795 ho->client_wrk = client_wrk->wrk_index;
796 ho->peer_index = ll->session_index;
797 ho->c_proto = TRANSPORT_PROTO_NONE;
798 ho->c_flags |= TRANSPORT_CONNECTION_F_NO_LOOKUP;
799 clib_memcpy (&ho->c_rmt_ip, &sep->ip, sizeof (sep->ip));
800 ho->flags |= CT_CONN_F_CLIENT;
802 ho->actual_tp = sep->original_tp;
805 * Accept connection on thread selected above. Connected reply comes
806 * after server accepts the connection.
809 wrk = ct_worker_get (thread_index);
811 /* Worker barrier held, add without additional lock */
812 clib_fifo_add1 (wrk->pending_connects, ho_index);
813 if (!wrk->have_connects)
815 wrk->have_connects = 1;
816 session_send_rpc_evt_to_thread_force (
817 thread_index, ct_accept_rpc_wrk_handler,
818 uword_to_pointer (thread_index, void *));
825 ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
827 session_endpoint_cfg_t *sep;
830 sep = (session_endpoint_cfg_t *) tep;
831 ct = ct_connection_alloc (0);
832 ct->server_wrk = sep->app_wrk_index;
833 ct->c_is_ip4 = sep->is_ip4;
834 clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip));
835 ct->c_lcl_port = sep->port;
836 ct->c_s_index = app_listener_index;
837 ct->actual_tp = sep->transport_proto;
838 return ct->c_c_index;
842 ct_stop_listen (u32 ct_index)
845 ct = ct_connection_get (ct_index, 0);
846 ct_connection_free (ct);
850 static transport_connection_t *
851 ct_listener_get (u32 ct_index)
853 return (transport_connection_t *) ct_connection_get (ct_index, 0);
856 static transport_connection_t *
857 ct_half_open_get (u32 ct_index)
859 return (transport_connection_t *) ct_connection_get (ct_index, 0);
863 ct_session_cleanup (u32 conn_index, u32 thread_index)
865 ct_connection_t *ct, *peer_ct;
867 ct = ct_connection_get (conn_index, thread_index);
871 peer_ct = ct_connection_get (ct->peer_index, thread_index);
873 peer_ct->peer_index = ~0;
875 ct_connection_free (ct);
879 ct_cleanup_ho (u32 ho_index)
881 ct_connection_free (ct_connection_get (ho_index, 0));
885 ct_session_connect (transport_endpoint_cfg_t * tep)
887 session_endpoint_cfg_t *sep_ext;
888 session_endpoint_t _sep, *sep = &_sep;
889 app_worker_t *app_wrk;
897 sep_ext = (session_endpoint_cfg_t *) tep;
898 _sep = *(session_endpoint_t *) tep;
899 app_wrk = app_worker_get (sep_ext->app_wrk_index);
900 app = application_get (app_wrk->app_index);
902 sep->transport_proto = sep_ext->original_tp;
903 table_index = application_local_session_table (app);
904 lh = session_lookup_local_endpoint (table_index, sep);
905 if (lh == SESSION_DROP_HANDLE)
906 return SESSION_E_FILTERED;
908 if (lh == SESSION_INVALID_HANDLE)
911 ll = listen_session_get_from_handle (lh);
912 al = app_listener_get_w_session (ll);
915 * Break loop if rule in local table points to connecting app. This
916 * can happen if client is a generic proxy. Route connect through
917 * global table instead.
919 if (al->app_index == app->app_index)
922 return ct_connect (app_wrk, ll, sep_ext);
925 * If nothing found, check the global scope for locally attached
926 * destinations. Make sure first that we're allowed to.
930 if (session_endpoint_is_local (sep))
931 return SESSION_E_NOROUTE;
933 if (!application_has_global_scope (app))
934 return SESSION_E_SCOPE;
936 fib_proto = session_endpoint_fib_proto (sep);
937 table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index);
938 ll = session_lookup_listener_wildcard (table_index, sep);
940 /* Avoid connecting app to own listener */
941 if (ll && ll->app_index != app->app_index)
942 return ct_connect (app_wrk, ll, sep_ext);
944 /* Failed to connect but no error */
945 return SESSION_E_LOCAL_CONNECT;
949 ct_session_postponed_cleanup (ct_connection_t *ct)
951 app_worker_t *app_wrk;
954 s = session_get (ct->c_s_index, ct->c_thread_index);
955 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
957 if (ct->flags & CT_CONN_F_CLIENT)
960 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT);
962 /* Normal free for client session as the fifos are allocated through
963 * the connects segment manager in a segment that's not shared with
965 ct_session_dealloc_fifos (ct, ct->client_rx_fifo, ct->client_tx_fifo);
966 session_free_w_fifos (s);
970 /* Manual session and fifo segment cleanup to avoid implicit
971 * segment manager cleanups and notifications */
972 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
975 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT);
976 app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_SESSION);
979 ct_session_dealloc_fifos (ct, s->rx_fifo, s->tx_fifo);
983 ct_connection_free (ct);
987 ct_handle_cleanups (void *args)
989 uword thread_index = pointer_to_uword (args);
990 const u32 max_cleanups = 100;
991 ct_cleanup_req_t *req;
997 wrk = ct_worker_get (thread_index);
998 wrk->have_cleanups = 0;
999 n_to_handle = clib_fifo_elts (wrk->pending_cleanups);
1000 n_to_handle = clib_min (n_to_handle, max_cleanups);
1004 clib_fifo_sub2 (wrk->pending_cleanups, req);
1005 ct = ct_connection_get (req->ct_index, thread_index);
1006 s = session_get (ct->c_s_index, ct->c_thread_index);
1007 if (!svm_fifo_has_event (s->tx_fifo))
1008 ct_session_postponed_cleanup (ct);
1010 clib_fifo_add1 (wrk->pending_cleanups, *req);
1014 if (clib_fifo_elts (wrk->pending_cleanups))
1016 wrk->have_cleanups = 1;
1017 session_send_rpc_evt_to_thread_force (
1018 thread_index, ct_handle_cleanups,
1019 uword_to_pointer (thread_index, void *));
1024 ct_program_cleanup (ct_connection_t *ct)
1026 ct_cleanup_req_t *req;
1030 thread_index = ct->c_thread_index;
1031 wrk = ct_worker_get (ct->c_thread_index);
1033 clib_fifo_add2 (wrk->pending_cleanups, req);
1034 req->ct_index = ct->c_c_index;
1036 if (wrk->have_cleanups)
1039 wrk->have_cleanups = 1;
1040 session_send_rpc_evt_to_thread_force (
1041 thread_index, ct_handle_cleanups, uword_to_pointer (thread_index, void *));
1045 ct_close_is_reset (ct_connection_t *ct, session_t *s)
1047 if (ct->flags & CT_CONN_F_CLIENT)
1048 return (svm_fifo_max_dequeue (ct->client_rx_fifo) > 0);
1050 return (svm_fifo_max_dequeue (s->rx_fifo) > 0);
1054 ct_session_close (u32 ct_index, u32 thread_index)
1056 ct_connection_t *ct, *peer_ct;
1059 ct = ct_connection_get (ct_index, thread_index);
1060 s = session_get (ct->c_s_index, ct->c_thread_index);
1061 peer_ct = ct_connection_get (ct->peer_index, thread_index);
1064 peer_ct->peer_index = ~0;
1065 /* Make sure session was allocated */
1066 if (peer_ct->flags & CT_CONN_F_HALF_OPEN)
1068 ct_session_connect_notify (s, SESSION_E_REFUSED);
1070 else if (peer_ct->c_s_index != ~0)
1072 if (ct_close_is_reset (ct, s))
1073 session_transport_reset_notify (&peer_ct->connection);
1075 session_transport_closing_notify (&peer_ct->connection);
1079 /* should not happen */
1080 clib_warning ("ct peer without session");
1081 ct_connection_free (peer_ct);
1085 /* Do not send closed notify to make sure pending tx events are
1086 * still delivered and program cleanup */
1087 ct_program_cleanup (ct);
1090 static transport_connection_t *
1091 ct_session_get (u32 ct_index, u32 thread_index)
1093 return (transport_connection_t *) ct_connection_get (ct_index,
1098 format_ct_connection_id (u8 * s, va_list * args)
1100 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
1105 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
1106 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
1107 format_ip4_address, &ct->c_lcl_ip4,
1108 clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address,
1109 &ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port));
1113 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
1114 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
1115 format_ip6_address, &ct->c_lcl_ip6,
1116 clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address,
1117 &ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port));
1124 ct_custom_tx (void *session, transport_send_params_t * sp)
1126 session_t *s = (session_t *) session;
1127 if (session_has_transport (s))
1129 /* If event enqueued towards peer, remove from scheduler and remove
1130 * session tx flag, i.e., accept new tx events. Unset fifo flag now to
1131 * avoid missing events if peer did not clear fifo flag yet, which is
1132 * interpreted as successful notification and session is descheduled. */
1133 svm_fifo_unset_event (s->tx_fifo);
1134 if (!ct_session_tx (s))
1135 sp->flags = TRANSPORT_SND_F_DESCHED;
1137 /* The scheduler uses packet count as a means of upper bounding the amount
1138 * of work done per dispatch. So make it look like we have sent something */
1143 ct_app_rx_evt (transport_connection_t * tc)
1145 ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct;
1148 peer_ct = ct_connection_get (ct->peer_index, tc->thread_index);
1151 ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
1152 return session_dequeue_notify (ps);
1156 format_ct_listener (u8 * s, va_list * args)
1158 u32 tc_index = va_arg (*args, u32);
1159 u32 __clib_unused thread_index = va_arg (*args, u32);
1160 u32 __clib_unused verbose = va_arg (*args, u32);
1161 ct_connection_t *ct = ct_connection_get (tc_index, 0);
1162 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1164 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "LISTEN");
1169 format_ct_half_open (u8 *s, va_list *args)
1171 u32 ho_index = va_arg (*args, u32);
1172 u32 verbose = va_arg (*args, u32);
1173 ct_connection_t *ct = ct_connection_get (ho_index, 0);
1174 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1176 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "HALF-OPEN");
1181 format_ct_connection (u8 * s, va_list * args)
1183 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
1184 u32 verbose = va_arg (*args, u32);
1188 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct);
1191 s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "ESTABLISHED");
1194 s = format (s, "\n");
1201 format_ct_session (u8 * s, va_list * args)
1203 u32 ct_index = va_arg (*args, u32);
1204 u32 thread_index = va_arg (*args, u32);
1205 u32 verbose = va_arg (*args, u32);
1206 ct_connection_t *ct;
1208 ct = ct_connection_get (ct_index, thread_index);
1211 s = format (s, "empty\n");
1215 s = format (s, "%U", format_ct_connection, ct, verbose);
1220 ct_enable_disable (vlib_main_t * vm, u8 is_en)
1222 vlib_thread_main_t *vtm = &vlib_thread_main;
1223 ct_main_t *cm = &ct_main;
1225 cm->n_workers = vlib_num_workers ();
1226 vec_validate (cm->wrk, vtm->n_vlib_mains);
1227 clib_spinlock_init (&cm->ho_reuseable_lock);
1228 clib_rwlock_init (&cm->app_segs_lock);
1233 static const transport_proto_vft_t cut_thru_proto = {
1234 .enable = ct_enable_disable,
1235 .start_listen = ct_start_listen,
1236 .stop_listen = ct_stop_listen,
1237 .get_connection = ct_session_get,
1238 .get_listener = ct_listener_get,
1239 .get_half_open = ct_half_open_get,
1240 .cleanup = ct_session_cleanup,
1241 .cleanup_ho = ct_cleanup_ho,
1242 .connect = ct_session_connect,
1243 .close = ct_session_close,
1244 .custom_tx = ct_custom_tx,
1245 .app_rx_evt = ct_app_rx_evt,
1246 .format_listener = format_ct_listener,
1247 .format_half_open = format_ct_half_open,
1248 .format_connection = format_ct_session,
1249 .transport_options = {
1252 .tx_type = TRANSPORT_TX_INTERNAL,
1253 .service_type = TRANSPORT_SERVICE_VC,
1259 ct_session_tx (session_t * s)
1261 ct_connection_t *ct, *peer_ct;
1264 ct = (ct_connection_t *) session_get_transport (s);
1265 peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index);
1268 peer_s = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
1269 if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
1271 return session_enqueue_notify (peer_s);
1274 static clib_error_t *
1275 ct_transport_init (vlib_main_t * vm)
1277 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
1278 FIB_PROTOCOL_IP4, ~0);
1279 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
1280 FIB_PROTOCOL_IP6, ~0);
1284 VLIB_INIT_FUNCTION (ct_transport_init);
1287 * fd.io coding-style-patch-verification: ON
1290 * eval: (c-set-style "gnu")