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;
158 /** List head for first worker evts pending handling on main */
159 clib_llist_index_t evts_pending_main;
162 /** last event poll time by thread */
163 clib_time_type_t last_event_poll;
167 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
168 vlib_node_runtime_t * node,
169 session_evt_elt_t * e, int *n_tx_packets);
171 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
172 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
173 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
175 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
177 typedef void (*session_update_time_fn) (f64 time_now, u8 thread_index);
179 typedef struct session_main_
181 /** Worker contexts */
182 session_worker_t *wrk;
184 /** Vector of transport update time functions */
185 session_update_time_fn *update_time_fns;
187 /** Event queues memfd segment */
188 fifo_segment_t wrk_mqs_segment;
190 /** Unique segment name counter */
191 u32 unique_segment_name_counter;
193 /** Per transport rx function that can either dequeue or peek */
194 session_fifo_rx_fn **session_tx_fns;
196 /** Per session type output nodes. Could optimize to group nodes by
197 * fib but lookup would then require session type parsing in session node.
198 * Trade memory for speed, for now */
199 u32 *session_type_to_next;
201 /** Thread for cl and ho that rely on cl allocs */
202 u32 transport_cl_thread;
204 transport_proto_t last_transport_proto_type;
206 /** Number of workers at pool realloc barrier */
207 u32 pool_realloc_at_barrier;
209 /** Lock to synchronize parallel forced reallocs */
210 clib_spinlock_t pool_realloc_lock;
216 /** Session manager is enabled */
219 /** Session manager initialized (not necessarily enabled) */
222 /** Enable session manager at startup */
223 u8 session_enable_asap;
225 /** Poll session node in main thread */
228 /** Allocate private rx mqs for external apps */
229 u8 use_private_rx_mqs;
231 /** Do not enable session queue node adaptive mode */
234 /** vpp fifo event queue configured length */
235 u32 configured_wrk_mq_length;
237 /** Session ssvm segment configs*/
238 uword wrk_mqs_segment_size;
240 /** Session table size parameters */
241 u32 configured_v4_session_table_buckets;
242 u32 configured_v4_session_table_memory;
243 u32 configured_v4_halfopen_table_buckets;
244 u32 configured_v4_halfopen_table_memory;
245 u32 configured_v6_session_table_buckets;
246 u32 configured_v6_session_table_memory;
247 u32 configured_v6_halfopen_table_buckets;
248 u32 configured_v6_halfopen_table_memory;
250 /** Transport table (preallocation) size parameters */
251 u32 local_endpoints_table_memory;
252 u32 local_endpoints_table_buckets;
254 /** Preallocate session config parameter */
255 u32 preallocated_sessions;
260 extern session_main_t session_main;
261 extern vlib_node_registration_t session_queue_node;
262 extern vlib_node_registration_t session_queue_process_node;
263 extern vlib_node_registration_t session_queue_pre_input_node;
265 typedef enum session_q_process_evt_
267 SESSION_Q_PROCESS_RUN_ON_MAIN = 1,
268 SESSION_Q_PROCESS_STOP
269 } session_q_process_evt_t;
271 #define TRANSPORT_PROTO_INVALID (session_main.last_transport_proto_type + 1)
272 #define TRANSPORT_N_PROTOS (session_main.last_transport_proto_type + 1)
275 session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt)
277 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
278 clib_llist_elt (wrk->event_elts, wrk->old_head));
282 session_evt_add_head_old (session_worker_t * wrk, session_evt_elt_t * elt)
284 clib_llist_add (wrk->event_elts, evt_list, elt,
285 clib_llist_elt (wrk->event_elts, wrk->old_head));
290 session_evt_ctrl_data_alloc (session_worker_t * wrk)
292 session_evt_ctrl_data_t *data;
293 pool_get (wrk->ctrl_evts_data, data);
294 return (data - wrk->ctrl_evts_data);
297 static inline session_evt_elt_t *
298 session_evt_alloc_ctrl (session_worker_t * wrk)
300 session_evt_elt_t *elt;
301 clib_llist_get (wrk->event_elts, elt);
302 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
303 clib_llist_elt (wrk->event_elts, wrk->ctrl_head));
308 session_evt_ctrl_data (session_worker_t * wrk, session_evt_elt_t * elt)
310 return (void *) (pool_elt_at_index (wrk->ctrl_evts_data,
311 elt->evt.ctrl_data_index));
315 session_evt_ctrl_data_free (session_worker_t * wrk, session_evt_elt_t * elt)
317 ASSERT (elt->evt.event_type > SESSION_IO_EVT_BUILTIN_TX);
318 pool_put_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index);
321 static inline session_evt_elt_t *
322 session_evt_alloc_new (session_worker_t * wrk)
324 session_evt_elt_t *elt;
325 clib_llist_get (wrk->event_elts, elt);
326 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
327 clib_llist_elt (wrk->event_elts, wrk->new_head));
331 static inline session_evt_elt_t *
332 session_evt_alloc_old (session_worker_t * wrk)
334 session_evt_elt_t *elt;
335 clib_llist_get (wrk->event_elts, elt);
336 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
337 clib_llist_elt (wrk->event_elts, wrk->old_head));
341 int session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq);
343 session_t *session_alloc (u32 thread_index);
344 void session_free (session_t * s);
345 void session_free_w_fifos (session_t * s);
346 void session_cleanup_half_open (session_handle_t ho_handle);
347 u8 session_is_valid (u32 si, u8 thread_index);
349 always_inline session_t *
350 session_get (u32 si, u32 thread_index)
352 ASSERT (session_is_valid (si, thread_index));
353 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
356 always_inline session_t *
357 session_get_if_valid (u64 si, u32 thread_index)
359 if (thread_index >= vec_len (session_main.wrk))
362 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
365 ASSERT (session_is_valid (si, thread_index));
366 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
369 always_inline session_t *
370 session_get_from_handle (session_handle_t handle)
372 session_main_t *smm = &session_main;
373 u32 session_index, thread_index;
374 session_parse_handle (handle, &session_index, &thread_index);
375 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
378 always_inline session_t *
379 session_get_from_handle_if_valid (session_handle_t handle)
381 u32 session_index, thread_index;
382 session_parse_handle (handle, &session_index, &thread_index);
383 return session_get_if_valid (session_index, thread_index);
386 u64 session_segment_handle (session_t * s);
389 * Acquires a lock that blocks a session pool from expanding.
391 * This is typically used for safely peeking into other threads'
392 * pools in order to clone elements. Lock should be dropped as soon
393 * as possible by calling @ref session_pool_remove_peeker.
395 * NOTE: Avoid using pool_elt_at_index while the lock is held because
396 * it may lead to free elt bitmap expansion/contraction!
399 session_pool_add_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_lock (&wrk->peekers_rw_locks);
408 session_pool_remove_peeker (u32 thread_index)
410 session_worker_t *wrk = &session_main.wrk[thread_index];
411 if (thread_index == vlib_get_thread_index ())
413 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
417 * Get session from handle and 'lock' pool resize if not in same thread
419 * Caller should drop the peek 'lock' as soon as possible.
421 always_inline session_t *
422 session_get_from_handle_safe (u64 handle)
424 u32 thread_index = session_thread_from_handle (handle);
425 session_worker_t *wrk = &session_main.wrk[thread_index];
427 if (thread_index == vlib_get_thread_index ())
429 return pool_elt_at_index (wrk->sessions,
430 session_index_from_handle (handle));
434 session_pool_add_peeker (thread_index);
435 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
436 return wrk->sessions + session_index_from_handle (handle);
441 session_get_index (session_t * s)
443 return (s - session_main.wrk[s->thread_index].sessions);
446 always_inline session_t *
447 session_clone_safe (u32 session_index, u32 thread_index)
449 session_t *old_s, *new_s;
450 u32 current_thread_index = vlib_get_thread_index ();
452 /* If during the memcpy pool is reallocated AND the memory allocator
453 * decides to give the old chunk of memory to somebody in a hurry to
454 * scribble something on it, we have a problem. So add this thread as
455 * a session pool peeker.
457 session_pool_add_peeker (thread_index);
458 new_s = session_alloc (current_thread_index);
459 old_s = session_main.wrk[thread_index].sessions + session_index;
460 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
461 session_pool_remove_peeker (thread_index);
462 new_s->thread_index = current_thread_index;
463 new_s->session_index = session_get_index (new_s);
467 int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh);
468 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
469 int session_stop_listen (session_t * s);
470 void session_half_close (session_t *s);
471 void session_close (session_t * s);
472 void session_reset (session_t * s);
473 void session_transport_half_close (session_t *s);
474 void session_transport_close (session_t * s);
475 void session_transport_reset (session_t * s);
476 void session_transport_cleanup (session_t * s);
477 int session_send_io_evt_to_thread (svm_fifo_t * f,
478 session_evt_type_t evt_type);
479 int session_enqueue_notify (session_t * s);
480 int session_dequeue_notify (session_t * s);
481 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
482 session_evt_type_t evt_type);
483 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
485 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
487 void session_add_self_custom_tx_evt (transport_connection_t * tc,
489 void sesssion_reschedule_tx (transport_connection_t * tc);
490 transport_connection_t *session_get_transport (session_t * s);
491 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
493 int session_transport_attribute (session_t *s, u8 is_get,
494 transport_endpt_attr_t *attr);
496 u8 *format_session (u8 * s, va_list * args);
497 uword unformat_session (unformat_input_t * input, va_list * args);
498 uword unformat_transport_connection (unformat_input_t * input,
502 * Interface to transport protos
505 int session_enqueue_stream_connection (transport_connection_t * tc,
506 vlib_buffer_t * b, u32 offset,
507 u8 queue_event, u8 is_in_order);
508 int session_enqueue_dgram_connection (session_t * s,
509 session_dgram_hdr_t * hdr,
510 vlib_buffer_t * b, u8 proto,
512 int session_stream_connect_notify (transport_connection_t * tc,
513 session_error_t err);
514 int session_dgram_connect_notify (transport_connection_t * tc,
515 u32 old_thread_index,
516 session_t ** new_session);
517 int session_stream_accept_notify (transport_connection_t * tc);
518 void session_transport_closing_notify (transport_connection_t * tc);
519 void session_transport_delete_notify (transport_connection_t * tc);
520 void session_half_open_delete_notify (transport_connection_t *tc);
521 void session_half_open_migrate_notify (transport_connection_t *tc);
522 int session_half_open_migrated_notify (transport_connection_t *tc);
523 void session_transport_closed_notify (transport_connection_t * tc);
524 void session_transport_reset_notify (transport_connection_t * tc);
525 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
526 u32 thread_index, u8 notify);
527 int session_dgram_accept (transport_connection_t * tc, u32 listener_index,
530 * Initialize session layer for given transport proto and ip version
532 * Allocates per session type (transport proto + ip version) data structures
533 * and adds arc from session queue node to session type output node.
535 * @param transport_proto transport proto to be registered
536 * @param vft virtual function table for transport
537 * @param is_ip4 flag that indicates if transports uses ipv4
538 * as underlying network layer
539 * @param output_node output node for transport
541 void session_register_transport (transport_proto_t transport_proto,
542 const transport_proto_vft_t * vft, u8 is_ip4,
544 transport_proto_t session_add_transport_proto (void);
545 void session_register_update_time_fn (session_update_time_fn fn, u8 is_add);
546 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
547 u32 offset, u32 max_bytes);
548 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
551 transport_max_rx_enqueue (transport_connection_t * tc)
553 session_t *s = session_get (tc->s_index, tc->thread_index);
554 return svm_fifo_max_enqueue_prod (s->rx_fifo);
558 transport_max_tx_dequeue (transport_connection_t * tc)
560 session_t *s = session_get (tc->s_index, tc->thread_index);
561 return svm_fifo_max_dequeue_cons (s->tx_fifo);
565 transport_max_rx_dequeue (transport_connection_t * tc)
567 session_t *s = session_get (tc->s_index, tc->thread_index);
568 return svm_fifo_max_dequeue (s->rx_fifo);
572 transport_rx_fifo_size (transport_connection_t * tc)
574 session_t *s = session_get (tc->s_index, tc->thread_index);
575 return svm_fifo_size (s->rx_fifo);
579 transport_tx_fifo_size (transport_connection_t * tc)
581 session_t *s = session_get (tc->s_index, tc->thread_index);
582 return svm_fifo_size (s->tx_fifo);
586 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
588 session_t *s = session_get (tc->c_index, tc->thread_index);
589 return svm_fifo_has_ooo_data (s->rx_fifo);
593 transport_rx_fifo_req_deq_ntf (transport_connection_t *tc)
595 session_t *s = session_get (tc->s_index, tc->thread_index);
596 svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF);
599 always_inline clib_time_type_t
600 transport_time_now (u32 thread_index)
602 return session_main.wrk[thread_index].last_vlib_time;
605 always_inline clib_us_time_t
606 transport_us_time_now (u32 thread_index)
608 return session_main.wrk[thread_index].last_vlib_us_time;
611 always_inline clib_time_type_t
612 transport_seconds_per_loop (u32 thread_index)
614 return session_main.wrk[thread_index].vm->seconds_per_loop;
618 transport_add_tx_event (transport_connection_t * tc)
620 session_t *s = session_get (tc->s_index, tc->thread_index);
621 if (svm_fifo_has_event (s->tx_fifo))
623 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
627 transport_cl_thread (void)
629 return session_main.transport_cl_thread;
637 listen_session_get_handle (session_t * s)
639 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
640 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
641 return session_handle (s);
644 always_inline session_t *
645 listen_session_get_from_handle (session_handle_t handle)
647 return session_get_from_handle (handle);
651 listen_session_parse_handle (session_handle_t handle, u32 * index,
654 session_parse_handle (handle, index, thread_index);
657 always_inline session_t *
658 listen_session_alloc (u8 thread_index, session_type_t type)
661 s = session_alloc (thread_index);
662 s->session_type = type;
663 s->session_state = SESSION_STATE_LISTENING;
667 always_inline session_t *
668 listen_session_get (u32 ls_index)
670 return session_get (ls_index, 0);
674 listen_session_free (session_t * s)
676 ASSERT (!s->rx_fifo);
680 always_inline session_t *
681 ho_session_alloc (void)
684 ASSERT (vlib_get_thread_index () == 0);
685 s = session_alloc (0);
686 s->session_state = SESSION_STATE_CONNECTING;
687 s->flags |= SESSION_F_HALF_OPEN;
688 /* Not ideal. Half-opens are only allocated from main with worker barrier
689 * but can be cleaned up, i.e., session_half_open_free, from main without
690 * a barrier. In debug images, the free_bitmap can grow while workers peek
691 * the sessions pool, e.g., session_half_open_migrate_notify, and as a
692 * result crash while validating the session. To avoid this, grow the bitmap
696 session_t *sp = session_main.wrk[0].sessions;
697 clib_bitmap_validate (pool_header (sp)->free_bitmap, s->session_index);
702 always_inline session_t *
703 ho_session_get (u32 ho_index)
705 return session_get (ho_index, 0 /* half-open thread */);
709 ho_session_free (session_t *s)
711 ASSERT (!s->rx_fifo && s->thread_index == 0);
715 transport_connection_t *listen_session_get_transport (session_t * s);
718 * Session layer functions
721 always_inline session_main_t *
722 vnet_get_session_main ()
724 return &session_main;
727 always_inline session_worker_t *
728 session_main_get_worker (u32 thread_index)
730 return &session_main.wrk[thread_index];
733 static inline session_worker_t *
734 session_main_get_worker_if_valid (u32 thread_index)
736 if (thread_index > vec_len (session_main.wrk))
738 return &session_main.wrk[thread_index];
741 always_inline svm_msg_q_t *
742 session_main_get_vpp_event_queue (u32 thread_index)
744 return session_main.wrk[thread_index].vpp_event_queue;
748 session_main_is_enabled ()
750 return session_main.is_enabled == 1;
753 #define session_cli_return_if_not_enabled() \
755 if (!session_main.is_enabled) \
756 return clib_error_return (0, "session layer is not enabled"); \
759 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
760 int session_main_flush_all_enqueue_events (u8 transport_proto);
761 void session_queue_run_on_main_thread (vlib_main_t * vm);
764 * Add session node pending buffer with custom node
766 * @param thread_index worker thread expected to send the buffer
767 * @param bi buffer index
768 * @param next_node next node edge index for buffer. Edge to next node
772 session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node)
774 session_worker_t *wrk = session_main_get_worker (thread_index);
775 vec_add1 (wrk->pending_tx_buffers, bi);
776 vec_add1 (wrk->pending_tx_nexts, next_node);
777 if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
778 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
782 session_wrk_update_time (session_worker_t *wrk, f64 now)
784 wrk->last_vlib_time = now;
785 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
788 void session_wrk_enable_adaptive_mode (session_worker_t *wrk);
789 fifo_segment_t *session_main_get_wrk_mqs_segment (void);
790 void session_node_enable_disable (u8 is_en);
791 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
792 void session_wrk_handle_evts_main_rpc ();
794 session_t *session_alloc_for_connection (transport_connection_t * tc);
795 session_t *session_alloc_for_half_open (transport_connection_t *tc);
797 typedef void (pool_safe_realloc_rpc_fn) (void *rpc_args);
801 u8 ph[STRUCT_OFFSET_OF (pool_header_t, max_elts) + 4];
803 } pool_safe_realloc_header_t;
805 STATIC_ASSERT_SIZEOF (pool_safe_realloc_header_t, sizeof (pool_header_t));
807 #define POOL_REALLOC_SAFE_ELT_THRESH 32
809 #define pool_realloc_flag(PH) \
810 ((pool_safe_realloc_header_t *) pool_header (PH))->flag
812 #define pool_realloc_safe_aligned(P, align) \
815 vlib_main_t *vm = vlib_get_main (); \
816 u32 free_elts, max_elts, n_alloc; \
817 ASSERT (vlib_get_thread_index () == 0); \
818 vlib_worker_thread_barrier_sync (vm); \
819 free_elts = pool_free_elts (P); \
820 max_elts = pool_max_len (P); \
821 n_alloc = clib_max (2 * max_elts, POOL_REALLOC_SAFE_ELT_THRESH); \
822 pool_alloc_aligned (P, free_elts + n_alloc, align); \
823 clib_bitmap_validate (pool_header (P)->free_bitmap, \
824 max_elts + n_alloc); \
825 pool_realloc_flag (P) = 0; \
826 vlib_worker_thread_barrier_release (vm); \
831 pool_program_safe_realloc (void *p, u32 thread_index,
832 pool_safe_realloc_rpc_fn *rpc_fn)
834 /* Reuse pad as a realloc flag */
835 if (pool_realloc_flag (p))
838 pool_realloc_flag (p) = 1;
839 session_send_rpc_evt_to_thread (0 /* thread index */, rpc_fn,
840 uword_to_pointer (thread_index, void *));
844 pool_realloc_maybe_wait_at_barrier (void)
846 if (!(*vlib_worker_threads->wait_at_barrier))
849 /* Node refork required. Don't stop at the barrier from within a node */
850 if (*vlib_worker_threads->node_reforks_required)
853 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, 1);
855 while (*vlib_worker_threads->wait_at_barrier)
858 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, -1);
861 #define pool_realloc_all_at_barrier(_not) \
862 (*vlib_worker_threads->workers_at_barrier >= (vlib_num_workers () - _not))
864 #define pool_realloc_safe_force(P) \
867 ALWAYS_ASSERT (*vlib_worker_threads->node_reforks_required); \
868 if (pool_realloc_all_at_barrier (1)) \
870 pool_alloc (P, pool_max_len (P)); \
874 session_main_t *sm = &session_main; \
875 clib_warning ("forced pool realloc"); \
876 clib_atomic_fetch_add (&sm->pool_realloc_at_barrier, 1); \
877 while (!pool_realloc_all_at_barrier (sm->pool_realloc_at_barrier)) \
879 clib_spinlock_lock (&sm->pool_realloc_lock); \
880 pool_alloc (P, pool_max_len (P)); \
881 clib_spinlock_unlock (&sm->pool_realloc_lock); \
882 clib_atomic_fetch_add (&sm->pool_realloc_at_barrier, -1); \
887 #define pool_needs_realloc(P) \
889 (vec_len (pool_header (P)->free_indices) < POOL_REALLOC_SAFE_ELT_THRESH && \
890 pool_free_elts (P) < POOL_REALLOC_SAFE_ELT_THRESH))
892 #define pool_get_aligned_safe(P, E, thread_index, rpc_fn, align) \
895 ASSERT (vlib_get_thread_index () == thread_index || \
896 vlib_thread_is_main_w_barrier ()); \
897 if (PREDICT_FALSE (pool_needs_realloc (P))) \
899 if (PREDICT_FALSE (!(P))) \
901 pool_alloc_aligned (P, 2 * POOL_REALLOC_SAFE_ELT_THRESH, \
904 else if (PREDICT_FALSE (pool_free_elts (P) < \
905 POOL_REALLOC_SAFE_ELT_THRESH / 2)) \
907 volatile typeof (P) *PP = &(P); \
908 pool_program_safe_realloc (P, thread_index, rpc_fn); \
911 while (pool_realloc_flag (P)) \
913 /* If refork required abort and consume existing elt */ \
914 if (*vlib_worker_threads->node_reforks_required) \
916 /* All workers at barrier realloc now */ \
917 if (pool_realloc_all_at_barrier (1)) \
918 pool_alloc_aligned (P, pool_max_len (P), align); \
921 pool_realloc_maybe_wait_at_barrier (); \
923 if (pool_free_elts (P) == 0) \
924 pool_realloc_safe_force (P); \
925 ALWAYS_ASSERT (pool_free_elts (P) > 0); \
931 pool_program_safe_realloc (P, thread_index, rpc_fn); \
934 pool_get_aligned (P, E, align); \
938 #endif /* __included_session_h__ */
941 * fd.io coding-style-patch-verification: ON
944 * eval: (c-set-style "gnu")