2 * Copyright (c) 2017-2019 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.
15 #ifndef __included_session_h__
16 #define __included_session_h__
18 #include <vppinfra/llist.h>
19 #include <vnet/session/session_types.h>
20 #include <vnet/session/session_lookup.h>
21 #include <vnet/session/session_debug.h>
22 #include <svm/message_queue.h>
23 #include <svm/fifo_segment.h>
25 #define foreach_session_input_error \
26 _(NO_SESSION, "No session drops") \
27 _(NO_LISTENER, "No listener for dst port drops") \
28 _(ENQUEUED, "Packets pushed into rx fifo") \
29 _(NOT_READY, "Session not ready packets") \
30 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
31 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
32 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
36 #define _(sym,str) SESSION_ERROR_##sym,
37 foreach_session_input_error
40 } session_input_error_t;
42 typedef struct session_tx_context_
44 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
46 transport_proto_vft_t *transport_vft;
47 transport_connection_t *tc;
48 transport_send_params_t sp;
52 u16 deq_per_first_buf;
57 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
58 session_dgram_hdr_t hdr;
60 /** Vector of tx buffer free lists */
62 } session_tx_context_t;
64 typedef struct session_evt_elt
66 clib_llist_anchor_t evt_list;
70 typedef struct session_ctrl_evt_data_
72 u8 data[SESSION_CTRL_MSG_MAX_SIZE];
73 } session_evt_ctrl_data_t;
75 typedef enum session_wrk_state_
78 SESSION_WRK_INTERRUPT,
80 } __clib_packed session_wrk_state_t;
82 typedef enum session_wrk_flags_
84 SESSION_WRK_F_ADAPTIVE = 1 << 0,
85 } __clib_packed session_wrk_flag_t;
87 typedef struct session_worker_
89 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
91 /** Worker session pool */
94 /** vpp event message queue for worker */
95 svm_msg_q_t *vpp_event_queue;
97 /** vlib_time_now last time around the track */
98 clib_time_type_t last_vlib_time;
100 /** vlib_time_now rounded to us precision and as u64 */
101 clib_us_time_t last_vlib_us_time;
103 /** Convenience pointer to this worker's vlib_main */
106 /** Per-proto vector of sessions to enqueue */
107 u32 **session_to_enqueue;
109 /** Timerfd used to periodically signal wrk session queue node */
113 session_wrk_flag_t flags;
116 session_wrk_state_t state;
118 /** Context for session tx */
119 session_tx_context_t ctx;
121 /** Pool of session event list elements */
122 session_evt_elt_t *event_elts;
124 /** Pool of ctrl events data buffers */
125 session_evt_ctrl_data_t *ctrl_evts_data;
127 /** Head of control events list */
128 clib_llist_index_t ctrl_head;
130 /** Head of list of elements */
131 clib_llist_index_t new_head;
133 /** Head of list of pending events */
134 clib_llist_index_t old_head;
136 /** Peekers rw lock */
137 clib_rwlock_t peekers_rw_locks;
139 /** Vector of buffers to be sent */
140 u32 *pending_tx_buffers;
142 /** Vector of nexts for the pending tx buffers */
143 u16 *pending_tx_nexts;
145 /** Clib file for timerfd. Used only if adaptive mode is on */
148 /** List of pending connects for first worker */
149 clib_llist_index_t pending_connects;
151 /** Flag that is set if main thread signaled to handle connects */
152 u32 n_pending_connects;
154 /** Main thread loops in poll mode without a connect */
155 u32 no_connect_loops;
158 /** last event poll time by thread */
159 clib_time_type_t last_event_poll;
163 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
164 vlib_node_runtime_t * node,
165 session_evt_elt_t * e, int *n_tx_packets);
167 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
168 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
169 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
171 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
173 typedef struct session_main_
175 /** Worker contexts */
176 session_worker_t *wrk;
178 /** Event queues memfd segment */
179 fifo_segment_t wrk_mqs_segment;
181 /** Unique segment name counter */
182 u32 unique_segment_name_counter;
184 /** Per transport rx function that can either dequeue or peek */
185 session_fifo_rx_fn **session_tx_fns;
187 /** Per session type output nodes. Could optimize to group nodes by
188 * fib but lookup would then require session type parsing in session node.
189 * Trade memory for speed, for now */
190 u32 *session_type_to_next;
192 /** Thread for cl and ho that rely on cl allocs */
193 u32 transport_cl_thread;
195 transport_proto_t last_transport_proto_type;
201 /** Session manager is enabled */
204 /** Session manager initialized (not necessarily enabled) */
207 /** Enable session manager at startup */
208 u8 session_enable_asap;
210 /** Poll session node in main thread */
213 /** Allocate private rx mqs for external apps */
214 u8 use_private_rx_mqs;
216 /** Do not enable session queue node adaptive mode */
219 /** vpp fifo event queue configured length */
220 u32 configured_wrk_mq_length;
222 /** Session ssvm segment configs*/
223 uword wrk_mqs_segment_size;
225 /** Session table size parameters */
226 u32 configured_v4_session_table_buckets;
227 u32 configured_v4_session_table_memory;
228 u32 configured_v4_halfopen_table_buckets;
229 u32 configured_v4_halfopen_table_memory;
230 u32 configured_v6_session_table_buckets;
231 u32 configured_v6_session_table_memory;
232 u32 configured_v6_halfopen_table_buckets;
233 u32 configured_v6_halfopen_table_memory;
235 /** Transport table (preallocation) size parameters */
236 u32 local_endpoints_table_memory;
237 u32 local_endpoints_table_buckets;
239 /** Preallocate session config parameter */
240 u32 preallocated_sessions;
245 extern session_main_t session_main;
246 extern vlib_node_registration_t session_queue_node;
247 extern vlib_node_registration_t session_queue_process_node;
248 extern vlib_node_registration_t session_queue_pre_input_node;
250 typedef enum session_q_process_evt_
252 SESSION_Q_PROCESS_RUN_ON_MAIN = 1,
253 SESSION_Q_PROCESS_STOP
254 } session_q_process_evt_t;
256 #define TRANSPORT_PROTO_INVALID (session_main.last_transport_proto_type + 1)
257 #define TRANSPORT_N_PROTOS (session_main.last_transport_proto_type + 1)
260 session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt)
262 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
263 clib_llist_elt (wrk->event_elts, wrk->old_head));
267 session_evt_add_head_old (session_worker_t * wrk, session_evt_elt_t * elt)
269 clib_llist_add (wrk->event_elts, evt_list, elt,
270 clib_llist_elt (wrk->event_elts, wrk->old_head));
275 session_evt_ctrl_data_alloc (session_worker_t * wrk)
277 session_evt_ctrl_data_t *data;
278 pool_get (wrk->ctrl_evts_data, data);
279 return (data - wrk->ctrl_evts_data);
282 static inline session_evt_elt_t *
283 session_evt_alloc_ctrl (session_worker_t * wrk)
285 session_evt_elt_t *elt;
286 clib_llist_get (wrk->event_elts, elt);
287 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
288 clib_llist_elt (wrk->event_elts, wrk->ctrl_head));
293 session_evt_ctrl_data (session_worker_t * wrk, session_evt_elt_t * elt)
295 return (void *) (pool_elt_at_index (wrk->ctrl_evts_data,
296 elt->evt.ctrl_data_index));
300 session_evt_ctrl_data_free (session_worker_t * wrk, session_evt_elt_t * elt)
302 ASSERT (elt->evt.event_type > SESSION_IO_EVT_BUILTIN_TX);
303 pool_put_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index);
306 static inline session_evt_elt_t *
307 session_evt_alloc_new (session_worker_t * wrk)
309 session_evt_elt_t *elt;
310 clib_llist_get (wrk->event_elts, elt);
311 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
312 clib_llist_elt (wrk->event_elts, wrk->new_head));
316 static inline session_evt_elt_t *
317 session_evt_alloc_old (session_worker_t * wrk)
319 session_evt_elt_t *elt;
320 clib_llist_get (wrk->event_elts, elt);
321 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
322 clib_llist_elt (wrk->event_elts, wrk->old_head));
326 int session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq);
328 session_t *session_alloc (u32 thread_index);
329 void session_free (session_t * s);
330 void session_free_w_fifos (session_t * s);
331 void session_cleanup_half_open (session_handle_t ho_handle);
332 u8 session_is_valid (u32 si, u8 thread_index);
334 always_inline session_t *
335 session_get (u32 si, u32 thread_index)
337 ASSERT (session_is_valid (si, thread_index));
338 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
341 always_inline session_t *
342 session_get_if_valid (u64 si, u32 thread_index)
344 if (thread_index >= vec_len (session_main.wrk))
347 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
350 ASSERT (session_is_valid (si, thread_index));
351 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
354 always_inline session_t *
355 session_get_from_handle (session_handle_t handle)
357 session_main_t *smm = &session_main;
358 u32 session_index, thread_index;
359 session_parse_handle (handle, &session_index, &thread_index);
360 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
363 always_inline session_t *
364 session_get_from_handle_if_valid (session_handle_t handle)
366 u32 session_index, thread_index;
367 session_parse_handle (handle, &session_index, &thread_index);
368 return session_get_if_valid (session_index, thread_index);
371 u64 session_segment_handle (session_t * s);
374 * Acquires a lock that blocks a session pool from expanding.
376 * This is typically used for safely peeking into other threads'
377 * pools in order to clone elements. Lock should be dropped as soon
378 * as possible by calling @ref session_pool_remove_peeker.
380 * NOTE: Avoid using pool_elt_at_index while the lock is held because
381 * it may lead to free elt bitmap expansion/contraction!
384 session_pool_add_peeker (u32 thread_index)
386 session_worker_t *wrk = &session_main.wrk[thread_index];
387 if (thread_index == vlib_get_thread_index ())
389 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
393 session_pool_remove_peeker (u32 thread_index)
395 session_worker_t *wrk = &session_main.wrk[thread_index];
396 if (thread_index == vlib_get_thread_index ())
398 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
402 * Get session from handle and 'lock' pool resize if not in same thread
404 * Caller should drop the peek 'lock' as soon as possible.
406 always_inline session_t *
407 session_get_from_handle_safe (u64 handle)
409 u32 thread_index = session_thread_from_handle (handle);
410 session_worker_t *wrk = &session_main.wrk[thread_index];
412 if (thread_index == vlib_get_thread_index ())
414 return pool_elt_at_index (wrk->sessions,
415 session_index_from_handle (handle));
419 session_pool_add_peeker (thread_index);
420 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
421 return wrk->sessions + session_index_from_handle (handle);
426 session_get_index (session_t * s)
428 return (s - session_main.wrk[s->thread_index].sessions);
431 always_inline session_t *
432 session_clone_safe (u32 session_index, u32 thread_index)
434 session_t *old_s, *new_s;
435 u32 current_thread_index = vlib_get_thread_index ();
437 /* If during the memcpy pool is reallocated AND the memory allocator
438 * decides to give the old chunk of memory to somebody in a hurry to
439 * scribble something on it, we have a problem. So add this thread as
440 * a session pool peeker.
442 session_pool_add_peeker (thread_index);
443 new_s = session_alloc (current_thread_index);
444 old_s = session_main.wrk[thread_index].sessions + session_index;
445 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
446 session_pool_remove_peeker (thread_index);
447 new_s->thread_index = current_thread_index;
448 new_s->session_index = session_get_index (new_s);
452 int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh);
453 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
454 int session_stop_listen (session_t * s);
455 void session_half_close (session_t *s);
456 void session_close (session_t * s);
457 void session_reset (session_t * s);
458 void session_transport_half_close (session_t *s);
459 void session_transport_close (session_t * s);
460 void session_transport_reset (session_t * s);
461 void session_transport_cleanup (session_t * s);
462 int session_send_io_evt_to_thread (svm_fifo_t * f,
463 session_evt_type_t evt_type);
464 int session_enqueue_notify (session_t * s);
465 int session_dequeue_notify (session_t * s);
466 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
467 session_evt_type_t evt_type);
468 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
470 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
472 void session_add_self_custom_tx_evt (transport_connection_t * tc,
474 void sesssion_reschedule_tx (transport_connection_t * tc);
475 transport_connection_t *session_get_transport (session_t * s);
476 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
478 int session_transport_attribute (session_t *s, u8 is_get,
479 transport_endpt_attr_t *attr);
481 u8 *format_session (u8 * s, va_list * args);
482 uword unformat_session (unformat_input_t * input, va_list * args);
483 uword unformat_transport_connection (unformat_input_t * input,
487 * Interface to transport protos
490 int session_enqueue_stream_connection (transport_connection_t * tc,
491 vlib_buffer_t * b, u32 offset,
492 u8 queue_event, u8 is_in_order);
493 int session_enqueue_dgram_connection (session_t * s,
494 session_dgram_hdr_t * hdr,
495 vlib_buffer_t * b, u8 proto,
497 int session_stream_connect_notify (transport_connection_t * tc,
498 session_error_t err);
499 int session_dgram_connect_notify (transport_connection_t * tc,
500 u32 old_thread_index,
501 session_t ** new_session);
502 int session_stream_accept_notify (transport_connection_t * tc);
503 void session_transport_closing_notify (transport_connection_t * tc);
504 void session_transport_delete_notify (transport_connection_t * tc);
505 void session_half_open_delete_notify (transport_connection_t *tc);
506 void session_half_open_migrate_notify (transport_connection_t *tc);
507 int session_half_open_migrated_notify (transport_connection_t *tc);
508 void session_transport_closed_notify (transport_connection_t * tc);
509 void session_transport_reset_notify (transport_connection_t * tc);
510 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
511 u32 thread_index, u8 notify);
512 int session_dgram_accept (transport_connection_t * tc, u32 listener_index,
515 * Initialize session layer for given transport proto and ip version
517 * Allocates per session type (transport proto + ip version) data structures
518 * and adds arc from session queue node to session type output node.
520 * @param transport_proto transport proto to be registered
521 * @param vft virtual function table for transport
522 * @param is_ip4 flag that indicates if transports uses ipv4
523 * as underlying network layer
524 * @param output_node output node for transport
526 void session_register_transport (transport_proto_t transport_proto,
527 const transport_proto_vft_t * vft, u8 is_ip4,
529 transport_proto_t session_add_transport_proto (void);
530 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
531 u32 offset, u32 max_bytes);
532 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
535 transport_max_rx_enqueue (transport_connection_t * tc)
537 session_t *s = session_get (tc->s_index, tc->thread_index);
538 return svm_fifo_max_enqueue_prod (s->rx_fifo);
542 transport_max_tx_dequeue (transport_connection_t * tc)
544 session_t *s = session_get (tc->s_index, tc->thread_index);
545 return svm_fifo_max_dequeue_cons (s->tx_fifo);
549 transport_max_rx_dequeue (transport_connection_t * tc)
551 session_t *s = session_get (tc->s_index, tc->thread_index);
552 return svm_fifo_max_dequeue (s->rx_fifo);
556 transport_rx_fifo_size (transport_connection_t * tc)
558 session_t *s = session_get (tc->s_index, tc->thread_index);
559 return svm_fifo_size (s->rx_fifo);
563 transport_tx_fifo_size (transport_connection_t * tc)
565 session_t *s = session_get (tc->s_index, tc->thread_index);
566 return svm_fifo_size (s->tx_fifo);
570 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
572 session_t *s = session_get (tc->c_index, tc->thread_index);
573 return svm_fifo_has_ooo_data (s->rx_fifo);
577 transport_rx_fifo_req_deq_ntf (transport_connection_t *tc)
579 session_t *s = session_get (tc->s_index, tc->thread_index);
580 svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF);
583 always_inline clib_time_type_t
584 transport_time_now (u32 thread_index)
586 return session_main.wrk[thread_index].last_vlib_time;
589 always_inline clib_us_time_t
590 transport_us_time_now (u32 thread_index)
592 return session_main.wrk[thread_index].last_vlib_us_time;
595 always_inline clib_time_type_t
596 transport_seconds_per_loop (u32 thread_index)
598 return session_main.wrk[thread_index].vm->seconds_per_loop;
602 transport_add_tx_event (transport_connection_t * tc)
604 session_t *s = session_get (tc->s_index, tc->thread_index);
605 if (svm_fifo_has_event (s->tx_fifo))
607 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
611 transport_cl_thread (void)
613 return session_main.transport_cl_thread;
621 listen_session_get_handle (session_t * s)
623 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
624 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
625 return session_handle (s);
628 always_inline session_t *
629 listen_session_get_from_handle (session_handle_t handle)
631 return session_get_from_handle (handle);
635 listen_session_parse_handle (session_handle_t handle, u32 * index,
638 session_parse_handle (handle, index, thread_index);
641 always_inline session_t *
642 listen_session_alloc (u8 thread_index, session_type_t type)
645 s = session_alloc (thread_index);
646 s->session_type = type;
647 s->session_state = SESSION_STATE_LISTENING;
651 always_inline session_t *
652 listen_session_get (u32 ls_index)
654 return session_get (ls_index, 0);
658 listen_session_free (session_t * s)
660 ASSERT (!s->rx_fifo);
664 always_inline session_t *
665 ho_session_alloc (void)
668 ASSERT (vlib_get_thread_index () == 0);
669 s = session_alloc (0);
670 s->session_state = SESSION_STATE_CONNECTING;
671 s->flags |= SESSION_F_HALF_OPEN;
675 always_inline session_t *
676 ho_session_get (u32 ho_index)
678 return session_get (ho_index, 0 /* half-open thread */);
682 ho_session_free (session_t *s)
684 ASSERT (!s->rx_fifo && s->thread_index == 0);
688 transport_connection_t *listen_session_get_transport (session_t * s);
691 * Session layer functions
694 always_inline session_main_t *
695 vnet_get_session_main ()
697 return &session_main;
700 always_inline session_worker_t *
701 session_main_get_worker (u32 thread_index)
703 return &session_main.wrk[thread_index];
706 static inline session_worker_t *
707 session_main_get_worker_if_valid (u32 thread_index)
709 if (thread_index > vec_len (session_main.wrk))
711 return &session_main.wrk[thread_index];
714 always_inline svm_msg_q_t *
715 session_main_get_vpp_event_queue (u32 thread_index)
717 return session_main.wrk[thread_index].vpp_event_queue;
721 session_main_is_enabled ()
723 return session_main.is_enabled == 1;
726 #define session_cli_return_if_not_enabled() \
728 if (!session_main.is_enabled) \
729 return clib_error_return (0, "session layer is not enabled"); \
732 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
733 int session_main_flush_all_enqueue_events (u8 transport_proto);
734 void session_queue_run_on_main_thread (vlib_main_t * vm);
737 * Add session node pending buffer with custom node
739 * @param thread_index worker thread expected to send the buffer
740 * @param bi buffer index
741 * @param next_node next node edge index for buffer. Edge to next node
745 session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node)
747 session_worker_t *wrk = session_main_get_worker (thread_index);
748 vec_add1 (wrk->pending_tx_buffers, bi);
749 vec_add1 (wrk->pending_tx_nexts, next_node);
750 if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
751 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
755 session_wrk_update_time (session_worker_t *wrk, f64 now)
757 wrk->last_vlib_time = now;
758 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
761 void session_wrk_enable_adaptive_mode (session_worker_t *wrk);
762 fifo_segment_t *session_main_get_wrk_mqs_segment (void);
763 void session_node_enable_disable (u8 is_en);
764 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
766 session_t *session_alloc_for_connection (transport_connection_t * tc);
767 session_t *session_alloc_for_half_open (transport_connection_t *tc);
769 #endif /* __included_session_h__ */
772 * fd.io coding-style-patch-verification: ON
775 * eval: (c-set-style "gnu")