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 vlib_buffer_t **transport_pending_bufs;
63 } session_tx_context_t;
65 typedef struct session_evt_elt
67 clib_llist_anchor_t evt_list;
71 typedef struct session_ctrl_evt_data_
73 u8 data[SESSION_CTRL_MSG_MAX_SIZE];
74 } session_evt_ctrl_data_t;
76 typedef enum session_wrk_state_
79 SESSION_WRK_INTERRUPT,
81 } __clib_packed session_wrk_state_t;
83 typedef enum session_wrk_flags_
85 SESSION_WRK_F_ADAPTIVE = 1 << 0,
86 } __clib_packed session_wrk_flag_t;
88 typedef struct session_worker_
90 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
92 /** Worker session pool */
95 /** vpp event message queue for worker */
96 svm_msg_q_t *vpp_event_queue;
98 /** vlib_time_now last time around the track */
99 clib_time_type_t last_vlib_time;
101 /** vlib_time_now rounded to us precision and as u64 */
102 clib_us_time_t last_vlib_us_time;
104 /** Convenience pointer to this worker's vlib_main */
107 /** Per-proto vector of sessions to enqueue */
108 u32 **session_to_enqueue;
110 /** Timerfd used to periodically signal wrk session queue node */
114 session_wrk_flag_t flags;
117 session_wrk_state_t state;
119 /** Context for session tx */
120 session_tx_context_t ctx;
122 /** Pool of session event list elements */
123 session_evt_elt_t *event_elts;
125 /** Pool of ctrl events data buffers */
126 session_evt_ctrl_data_t *ctrl_evts_data;
128 /** Head of control events list */
129 clib_llist_index_t ctrl_head;
131 /** Head of list of elements */
132 clib_llist_index_t new_head;
134 /** Head of list of pending events */
135 clib_llist_index_t old_head;
137 /** Peekers rw lock */
138 clib_rwlock_t peekers_rw_locks;
140 /** Vector of buffers to be sent */
141 u32 *pending_tx_buffers;
143 /** Vector of nexts for the pending tx buffers */
144 u16 *pending_tx_nexts;
146 /** Clib file for timerfd. Used only if adaptive mode is on */
149 /** List of pending connects for first worker */
150 clib_llist_index_t pending_connects;
152 /** Flag that is set if main thread signaled to handle connects */
153 u32 n_pending_connects;
155 /** Main thread loops in poll mode without a connect */
156 u32 no_connect_loops;
159 /** last event poll time by thread */
160 clib_time_type_t last_event_poll;
164 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
165 vlib_node_runtime_t * node,
166 session_evt_elt_t * e, int *n_tx_packets);
168 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
169 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
170 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
172 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
174 typedef void (*session_update_time_fn) (f64 time_now, u8 thread_index);
176 typedef struct session_main_
178 /** Worker contexts */
179 session_worker_t *wrk;
181 /** Vector of transport update time functions */
182 session_update_time_fn *update_time_fns;
184 /** Event queues memfd segment */
185 fifo_segment_t wrk_mqs_segment;
187 /** Unique segment name counter */
188 u32 unique_segment_name_counter;
190 /** Per transport rx function that can either dequeue or peek */
191 session_fifo_rx_fn **session_tx_fns;
193 /** Per session type output nodes. Could optimize to group nodes by
194 * fib but lookup would then require session type parsing in session node.
195 * Trade memory for speed, for now */
196 u32 *session_type_to_next;
198 /** Thread for cl and ho that rely on cl allocs */
199 u32 transport_cl_thread;
201 transport_proto_t last_transport_proto_type;
207 /** Session manager is enabled */
210 /** Session manager initialized (not necessarily enabled) */
213 /** Enable session manager at startup */
214 u8 session_enable_asap;
216 /** Poll session node in main thread */
219 /** Allocate private rx mqs for external apps */
220 u8 use_private_rx_mqs;
222 /** Do not enable session queue node adaptive mode */
225 /** vpp fifo event queue configured length */
226 u32 configured_wrk_mq_length;
228 /** Session ssvm segment configs*/
229 uword wrk_mqs_segment_size;
231 /** Session table size parameters */
232 u32 configured_v4_session_table_buckets;
233 u32 configured_v4_session_table_memory;
234 u32 configured_v4_halfopen_table_buckets;
235 u32 configured_v4_halfopen_table_memory;
236 u32 configured_v6_session_table_buckets;
237 u32 configured_v6_session_table_memory;
238 u32 configured_v6_halfopen_table_buckets;
239 u32 configured_v6_halfopen_table_memory;
241 /** Transport table (preallocation) size parameters */
242 u32 local_endpoints_table_memory;
243 u32 local_endpoints_table_buckets;
245 /** Preallocate session config parameter */
246 u32 preallocated_sessions;
251 extern session_main_t session_main;
252 extern vlib_node_registration_t session_queue_node;
253 extern vlib_node_registration_t session_queue_process_node;
254 extern vlib_node_registration_t session_queue_pre_input_node;
256 typedef enum session_q_process_evt_
258 SESSION_Q_PROCESS_RUN_ON_MAIN = 1,
259 SESSION_Q_PROCESS_STOP
260 } session_q_process_evt_t;
262 #define TRANSPORT_PROTO_INVALID (session_main.last_transport_proto_type + 1)
263 #define TRANSPORT_N_PROTOS (session_main.last_transport_proto_type + 1)
266 session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt)
268 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
269 clib_llist_elt (wrk->event_elts, wrk->old_head));
273 session_evt_add_head_old (session_worker_t * wrk, session_evt_elt_t * elt)
275 clib_llist_add (wrk->event_elts, evt_list, elt,
276 clib_llist_elt (wrk->event_elts, wrk->old_head));
281 session_evt_ctrl_data_alloc (session_worker_t * wrk)
283 session_evt_ctrl_data_t *data;
284 pool_get (wrk->ctrl_evts_data, data);
285 return (data - wrk->ctrl_evts_data);
288 static inline session_evt_elt_t *
289 session_evt_alloc_ctrl (session_worker_t * wrk)
291 session_evt_elt_t *elt;
292 clib_llist_get (wrk->event_elts, elt);
293 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
294 clib_llist_elt (wrk->event_elts, wrk->ctrl_head));
299 session_evt_ctrl_data (session_worker_t * wrk, session_evt_elt_t * elt)
301 return (void *) (pool_elt_at_index (wrk->ctrl_evts_data,
302 elt->evt.ctrl_data_index));
306 session_evt_ctrl_data_free (session_worker_t * wrk, session_evt_elt_t * elt)
308 ASSERT (elt->evt.event_type > SESSION_IO_EVT_BUILTIN_TX);
309 pool_put_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index);
312 static inline session_evt_elt_t *
313 session_evt_alloc_new (session_worker_t * wrk)
315 session_evt_elt_t *elt;
316 clib_llist_get (wrk->event_elts, elt);
317 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
318 clib_llist_elt (wrk->event_elts, wrk->new_head));
322 static inline session_evt_elt_t *
323 session_evt_alloc_old (session_worker_t * wrk)
325 session_evt_elt_t *elt;
326 clib_llist_get (wrk->event_elts, elt);
327 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
328 clib_llist_elt (wrk->event_elts, wrk->old_head));
332 int session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq);
334 session_t *session_alloc (u32 thread_index);
335 void session_free (session_t * s);
336 void session_free_w_fifos (session_t * s);
337 void session_cleanup_half_open (session_handle_t ho_handle);
338 u8 session_is_valid (u32 si, u8 thread_index);
340 always_inline session_t *
341 session_get (u32 si, u32 thread_index)
343 ASSERT (session_is_valid (si, thread_index));
344 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
347 always_inline session_t *
348 session_get_if_valid (u64 si, u32 thread_index)
350 if (thread_index >= vec_len (session_main.wrk))
353 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
356 ASSERT (session_is_valid (si, thread_index));
357 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
360 always_inline session_t *
361 session_get_from_handle (session_handle_t handle)
363 session_main_t *smm = &session_main;
364 u32 session_index, thread_index;
365 session_parse_handle (handle, &session_index, &thread_index);
366 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
369 always_inline session_t *
370 session_get_from_handle_if_valid (session_handle_t handle)
372 u32 session_index, thread_index;
373 session_parse_handle (handle, &session_index, &thread_index);
374 return session_get_if_valid (session_index, thread_index);
377 u64 session_segment_handle (session_t * s);
380 * Acquires a lock that blocks a session pool from expanding.
382 * This is typically used for safely peeking into other threads'
383 * pools in order to clone elements. Lock should be dropped as soon
384 * as possible by calling @ref session_pool_remove_peeker.
386 * NOTE: Avoid using pool_elt_at_index while the lock is held because
387 * it may lead to free elt bitmap expansion/contraction!
390 session_pool_add_peeker (u32 thread_index)
392 session_worker_t *wrk = &session_main.wrk[thread_index];
393 if (thread_index == vlib_get_thread_index ())
395 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
399 session_pool_remove_peeker (u32 thread_index)
401 session_worker_t *wrk = &session_main.wrk[thread_index];
402 if (thread_index == vlib_get_thread_index ())
404 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
408 * Get session from handle and 'lock' pool resize if not in same thread
410 * Caller should drop the peek 'lock' as soon as possible.
412 always_inline session_t *
413 session_get_from_handle_safe (u64 handle)
415 u32 thread_index = session_thread_from_handle (handle);
416 session_worker_t *wrk = &session_main.wrk[thread_index];
418 if (thread_index == vlib_get_thread_index ())
420 return pool_elt_at_index (wrk->sessions,
421 session_index_from_handle (handle));
425 session_pool_add_peeker (thread_index);
426 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
427 return wrk->sessions + session_index_from_handle (handle);
432 session_get_index (session_t * s)
434 return (s - session_main.wrk[s->thread_index].sessions);
437 always_inline session_t *
438 session_clone_safe (u32 session_index, u32 thread_index)
440 session_t *old_s, *new_s;
441 u32 current_thread_index = vlib_get_thread_index ();
443 /* If during the memcpy pool is reallocated AND the memory allocator
444 * decides to give the old chunk of memory to somebody in a hurry to
445 * scribble something on it, we have a problem. So add this thread as
446 * a session pool peeker.
448 session_pool_add_peeker (thread_index);
449 new_s = session_alloc (current_thread_index);
450 old_s = session_main.wrk[thread_index].sessions + session_index;
451 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
452 session_pool_remove_peeker (thread_index);
453 new_s->thread_index = current_thread_index;
454 new_s->session_index = session_get_index (new_s);
458 int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh);
459 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
460 int session_stop_listen (session_t * s);
461 void session_half_close (session_t *s);
462 void session_close (session_t * s);
463 void session_reset (session_t * s);
464 void session_transport_half_close (session_t *s);
465 void session_transport_close (session_t * s);
466 void session_transport_reset (session_t * s);
467 void session_transport_cleanup (session_t * s);
468 int session_send_io_evt_to_thread (svm_fifo_t * f,
469 session_evt_type_t evt_type);
470 int session_enqueue_notify (session_t * s);
471 int session_dequeue_notify (session_t * s);
472 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
473 session_evt_type_t evt_type);
474 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
476 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
478 void session_add_self_custom_tx_evt (transport_connection_t * tc,
480 void sesssion_reschedule_tx (transport_connection_t * tc);
481 transport_connection_t *session_get_transport (session_t * s);
482 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
484 int session_transport_attribute (session_t *s, u8 is_get,
485 transport_endpt_attr_t *attr);
487 u8 *format_session (u8 * s, va_list * args);
488 uword unformat_session (unformat_input_t * input, va_list * args);
489 uword unformat_transport_connection (unformat_input_t * input,
493 * Interface to transport protos
496 int session_enqueue_stream_connection (transport_connection_t * tc,
497 vlib_buffer_t * b, u32 offset,
498 u8 queue_event, u8 is_in_order);
499 int session_enqueue_dgram_connection (session_t * s,
500 session_dgram_hdr_t * hdr,
501 vlib_buffer_t * b, u8 proto,
503 int session_stream_connect_notify (transport_connection_t * tc,
504 session_error_t err);
505 int session_dgram_connect_notify (transport_connection_t * tc,
506 u32 old_thread_index,
507 session_t ** new_session);
508 int session_stream_accept_notify (transport_connection_t * tc);
509 void session_transport_closing_notify (transport_connection_t * tc);
510 void session_transport_delete_notify (transport_connection_t * tc);
511 void session_half_open_delete_notify (transport_connection_t *tc);
512 void session_half_open_migrate_notify (transport_connection_t *tc);
513 int session_half_open_migrated_notify (transport_connection_t *tc);
514 void session_transport_closed_notify (transport_connection_t * tc);
515 void session_transport_reset_notify (transport_connection_t * tc);
516 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
517 u32 thread_index, u8 notify);
518 int session_dgram_accept (transport_connection_t * tc, u32 listener_index,
521 * Initialize session layer for given transport proto and ip version
523 * Allocates per session type (transport proto + ip version) data structures
524 * and adds arc from session queue node to session type output node.
526 * @param transport_proto transport proto to be registered
527 * @param vft virtual function table for transport
528 * @param is_ip4 flag that indicates if transports uses ipv4
529 * as underlying network layer
530 * @param output_node output node for transport
532 void session_register_transport (transport_proto_t transport_proto,
533 const transport_proto_vft_t * vft, u8 is_ip4,
535 transport_proto_t session_add_transport_proto (void);
536 void session_register_update_time_fn (session_update_time_fn fn, u8 is_add);
537 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
538 u32 offset, u32 max_bytes);
539 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
542 transport_max_rx_enqueue (transport_connection_t * tc)
544 session_t *s = session_get (tc->s_index, tc->thread_index);
545 return svm_fifo_max_enqueue_prod (s->rx_fifo);
549 transport_max_tx_dequeue (transport_connection_t * tc)
551 session_t *s = session_get (tc->s_index, tc->thread_index);
552 return svm_fifo_max_dequeue_cons (s->tx_fifo);
556 transport_max_rx_dequeue (transport_connection_t * tc)
558 session_t *s = session_get (tc->s_index, tc->thread_index);
559 return svm_fifo_max_dequeue (s->rx_fifo);
563 transport_rx_fifo_size (transport_connection_t * tc)
565 session_t *s = session_get (tc->s_index, tc->thread_index);
566 return svm_fifo_size (s->rx_fifo);
570 transport_tx_fifo_size (transport_connection_t * tc)
572 session_t *s = session_get (tc->s_index, tc->thread_index);
573 return svm_fifo_size (s->tx_fifo);
577 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
579 session_t *s = session_get (tc->c_index, tc->thread_index);
580 return svm_fifo_has_ooo_data (s->rx_fifo);
584 transport_rx_fifo_req_deq_ntf (transport_connection_t *tc)
586 session_t *s = session_get (tc->s_index, tc->thread_index);
587 svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF);
590 always_inline clib_time_type_t
591 transport_time_now (u32 thread_index)
593 return session_main.wrk[thread_index].last_vlib_time;
596 always_inline clib_us_time_t
597 transport_us_time_now (u32 thread_index)
599 return session_main.wrk[thread_index].last_vlib_us_time;
602 always_inline clib_time_type_t
603 transport_seconds_per_loop (u32 thread_index)
605 return session_main.wrk[thread_index].vm->seconds_per_loop;
609 transport_add_tx_event (transport_connection_t * tc)
611 session_t *s = session_get (tc->s_index, tc->thread_index);
612 if (svm_fifo_has_event (s->tx_fifo))
614 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
618 transport_cl_thread (void)
620 return session_main.transport_cl_thread;
628 listen_session_get_handle (session_t * s)
630 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
631 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
632 return session_handle (s);
635 always_inline session_t *
636 listen_session_get_from_handle (session_handle_t handle)
638 return session_get_from_handle (handle);
642 listen_session_parse_handle (session_handle_t handle, u32 * index,
645 session_parse_handle (handle, index, thread_index);
648 always_inline session_t *
649 listen_session_alloc (u8 thread_index, session_type_t type)
652 s = session_alloc (thread_index);
653 s->session_type = type;
654 s->session_state = SESSION_STATE_LISTENING;
658 always_inline session_t *
659 listen_session_get (u32 ls_index)
661 return session_get (ls_index, 0);
665 listen_session_free (session_t * s)
667 ASSERT (!s->rx_fifo);
671 always_inline session_t *
672 ho_session_alloc (void)
675 ASSERT (vlib_get_thread_index () == 0);
676 s = session_alloc (0);
677 s->session_state = SESSION_STATE_CONNECTING;
678 s->flags |= SESSION_F_HALF_OPEN;
679 /* Not ideal. Half-opens are only allocated from main with worker barrier
680 * but can be cleaned up, i.e., session_half_open_free, from main without
681 * a barrier. In debug images, the free_bitmap can grow while workers peek
682 * the sessions pool, e.g., session_half_open_migrate_notify, and as a
683 * result crash while validating the session. To avoid this, grow the bitmap
687 session_t *sp = session_main.wrk[0].sessions;
688 clib_bitmap_validate (pool_header (sp)->free_bitmap, s->session_index);
693 always_inline session_t *
694 ho_session_get (u32 ho_index)
696 return session_get (ho_index, 0 /* half-open thread */);
700 ho_session_free (session_t *s)
702 ASSERT (!s->rx_fifo && s->thread_index == 0);
706 transport_connection_t *listen_session_get_transport (session_t * s);
709 * Session layer functions
712 always_inline session_main_t *
713 vnet_get_session_main ()
715 return &session_main;
718 always_inline session_worker_t *
719 session_main_get_worker (u32 thread_index)
721 return &session_main.wrk[thread_index];
724 static inline session_worker_t *
725 session_main_get_worker_if_valid (u32 thread_index)
727 if (thread_index > vec_len (session_main.wrk))
729 return &session_main.wrk[thread_index];
732 always_inline svm_msg_q_t *
733 session_main_get_vpp_event_queue (u32 thread_index)
735 return session_main.wrk[thread_index].vpp_event_queue;
739 session_main_is_enabled ()
741 return session_main.is_enabled == 1;
744 #define session_cli_return_if_not_enabled() \
746 if (!session_main.is_enabled) \
747 return clib_error_return (0, "session layer is not enabled"); \
750 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
751 int session_main_flush_all_enqueue_events (u8 transport_proto);
752 void session_queue_run_on_main_thread (vlib_main_t * vm);
755 * Add session node pending buffer with custom node
757 * @param thread_index worker thread expected to send the buffer
758 * @param bi buffer index
759 * @param next_node next node edge index for buffer. Edge to next node
763 session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node)
765 session_worker_t *wrk = session_main_get_worker (thread_index);
766 vec_add1 (wrk->pending_tx_buffers, bi);
767 vec_add1 (wrk->pending_tx_nexts, next_node);
768 if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
769 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
773 session_wrk_update_time (session_worker_t *wrk, f64 now)
775 wrk->last_vlib_time = now;
776 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
779 void session_wrk_enable_adaptive_mode (session_worker_t *wrk);
780 fifo_segment_t *session_main_get_wrk_mqs_segment (void);
781 void session_node_enable_disable (u8 is_en);
782 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
784 session_t *session_alloc_for_connection (transport_connection_t * tc);
785 session_t *session_alloc_for_half_open (transport_connection_t *tc);
787 #endif /* __included_session_h__ */
790 * fd.io coding-style-patch-verification: ON
793 * eval: (c-set-style "gnu")