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 /** Vector of buffers to be sent */
138 u32 *pending_tx_buffers;
140 /** Vector of nexts for the pending tx buffers */
141 u16 *pending_tx_nexts;
143 /** Clib file for timerfd. Used only if adaptive mode is on */
146 /** List of pending connects for first worker */
147 clib_llist_index_t pending_connects;
149 /** Flag that is set if main thread signaled to handle connects */
150 u32 n_pending_connects;
152 /** Main thread loops in poll mode without a connect */
153 u32 no_connect_loops;
155 /** List head for first worker evts pending handling on main */
156 clib_llist_index_t evts_pending_main;
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;
203 /** Number of workers at pool realloc barrier */
204 volatile u32 pool_realloc_at_barrier;
206 /** Number of workers doing reallocs */
207 volatile u32 pool_realloc_doing_work;
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 * Get session from handle and avoid pool validation if no same thread
391 * Peekers are fine because pool grows with barrier (see @ref session_alloc)
393 always_inline session_t *
394 session_get_from_handle_safe (u64 handle)
396 u32 thread_index = session_thread_from_handle (handle);
397 session_worker_t *wrk = &session_main.wrk[thread_index];
399 if (thread_index == vlib_get_thread_index ())
401 return pool_elt_at_index (wrk->sessions,
402 session_index_from_handle (handle));
406 /* Don't use pool_elt_at index to avoid pool bitmap reallocs */
407 return wrk->sessions + session_index_from_handle (handle);
411 always_inline session_t *
412 session_clone_safe (u32 session_index, u32 thread_index)
414 u32 current_thread_index = vlib_get_thread_index (), new_index;
415 session_t *old_s, *new_s;
417 new_s = session_alloc (current_thread_index);
418 new_index = new_s->session_index;
419 /* Session pools are reallocated with barrier (see @ref session_alloc) */
420 old_s = session_main.wrk[thread_index].sessions + session_index;
421 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
422 new_s->thread_index = current_thread_index;
423 new_s->session_index = new_index;
427 int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh);
428 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
429 int session_stop_listen (session_t * s);
430 void session_half_close (session_t *s);
431 void session_close (session_t * s);
432 void session_reset (session_t * s);
433 void session_transport_half_close (session_t *s);
434 void session_transport_close (session_t * s);
435 void session_transport_reset (session_t * s);
436 void session_transport_cleanup (session_t * s);
437 int session_send_io_evt_to_thread (svm_fifo_t * f,
438 session_evt_type_t evt_type);
439 int session_enqueue_notify (session_t * s);
440 int session_dequeue_notify (session_t * s);
441 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
442 session_evt_type_t evt_type);
443 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
445 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
447 void session_add_self_custom_tx_evt (transport_connection_t * tc,
449 void sesssion_reschedule_tx (transport_connection_t * tc);
450 transport_connection_t *session_get_transport (session_t * s);
451 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
453 int session_transport_attribute (session_t *s, u8 is_get,
454 transport_endpt_attr_t *attr);
456 u8 *format_session (u8 * s, va_list * args);
457 uword unformat_session (unformat_input_t * input, va_list * args);
458 uword unformat_transport_connection (unformat_input_t * input,
462 * Interface to transport protos
465 int session_enqueue_stream_connection (transport_connection_t * tc,
466 vlib_buffer_t * b, u32 offset,
467 u8 queue_event, u8 is_in_order);
468 int session_enqueue_dgram_connection (session_t * s,
469 session_dgram_hdr_t * hdr,
470 vlib_buffer_t * b, u8 proto,
472 int session_stream_connect_notify (transport_connection_t * tc,
473 session_error_t err);
474 int session_dgram_connect_notify (transport_connection_t * tc,
475 u32 old_thread_index,
476 session_t ** new_session);
477 int session_stream_accept_notify (transport_connection_t * tc);
478 void session_transport_closing_notify (transport_connection_t * tc);
479 void session_transport_delete_notify (transport_connection_t * tc);
480 void session_half_open_delete_notify (transport_connection_t *tc);
481 void session_half_open_migrate_notify (transport_connection_t *tc);
482 int session_half_open_migrated_notify (transport_connection_t *tc);
483 void session_transport_closed_notify (transport_connection_t * tc);
484 void session_transport_reset_notify (transport_connection_t * tc);
485 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
486 u32 thread_index, u8 notify);
487 int session_dgram_accept (transport_connection_t * tc, u32 listener_index,
490 * Initialize session layer for given transport proto and ip version
492 * Allocates per session type (transport proto + ip version) data structures
493 * and adds arc from session queue node to session type output node.
495 * @param transport_proto transport proto to be registered
496 * @param vft virtual function table for transport
497 * @param is_ip4 flag that indicates if transports uses ipv4
498 * as underlying network layer
499 * @param output_node output node for transport
501 void session_register_transport (transport_proto_t transport_proto,
502 const transport_proto_vft_t * vft, u8 is_ip4,
504 transport_proto_t session_add_transport_proto (void);
505 void session_register_update_time_fn (session_update_time_fn fn, u8 is_add);
506 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
507 u32 offset, u32 max_bytes);
508 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
511 transport_max_rx_enqueue (transport_connection_t * tc)
513 session_t *s = session_get (tc->s_index, tc->thread_index);
514 return svm_fifo_max_enqueue_prod (s->rx_fifo);
518 transport_max_tx_dequeue (transport_connection_t * tc)
520 session_t *s = session_get (tc->s_index, tc->thread_index);
521 return svm_fifo_max_dequeue_cons (s->tx_fifo);
525 transport_max_rx_dequeue (transport_connection_t * tc)
527 session_t *s = session_get (tc->s_index, tc->thread_index);
528 return svm_fifo_max_dequeue (s->rx_fifo);
532 transport_rx_fifo_size (transport_connection_t * tc)
534 session_t *s = session_get (tc->s_index, tc->thread_index);
535 return svm_fifo_size (s->rx_fifo);
539 transport_tx_fifo_size (transport_connection_t * tc)
541 session_t *s = session_get (tc->s_index, tc->thread_index);
542 return svm_fifo_size (s->tx_fifo);
546 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
548 session_t *s = session_get (tc->c_index, tc->thread_index);
549 return svm_fifo_has_ooo_data (s->rx_fifo);
553 transport_rx_fifo_req_deq_ntf (transport_connection_t *tc)
555 session_t *s = session_get (tc->s_index, tc->thread_index);
556 svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF);
559 always_inline clib_time_type_t
560 transport_time_now (u32 thread_index)
562 return session_main.wrk[thread_index].last_vlib_time;
565 always_inline clib_us_time_t
566 transport_us_time_now (u32 thread_index)
568 return session_main.wrk[thread_index].last_vlib_us_time;
571 always_inline clib_time_type_t
572 transport_seconds_per_loop (u32 thread_index)
574 return session_main.wrk[thread_index].vm->seconds_per_loop;
578 transport_add_tx_event (transport_connection_t * tc)
580 session_t *s = session_get (tc->s_index, tc->thread_index);
581 if (svm_fifo_has_event (s->tx_fifo))
583 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
587 transport_cl_thread (void)
589 return session_main.transport_cl_thread;
597 listen_session_get_handle (session_t * s)
599 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
600 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
601 return session_handle (s);
604 always_inline session_t *
605 listen_session_get_from_handle (session_handle_t handle)
607 return session_get_from_handle (handle);
611 listen_session_parse_handle (session_handle_t handle, u32 * index,
614 session_parse_handle (handle, index, thread_index);
617 always_inline session_t *
618 listen_session_alloc (u8 thread_index, session_type_t type)
621 s = session_alloc (thread_index);
622 s->session_type = type;
623 s->session_state = SESSION_STATE_LISTENING;
627 always_inline session_t *
628 listen_session_get (u32 ls_index)
630 return session_get (ls_index, 0);
634 listen_session_free (session_t * s)
636 ASSERT (!s->rx_fifo);
640 always_inline session_t *
641 ho_session_alloc (void)
644 ASSERT (vlib_get_thread_index () == 0);
645 s = session_alloc (0);
646 s->session_state = SESSION_STATE_CONNECTING;
647 s->flags |= SESSION_F_HALF_OPEN;
648 /* Not ideal. Half-opens are only allocated from main with worker barrier
649 * but can be cleaned up, i.e., session_half_open_free, from main without
650 * a barrier. In debug images, the free_bitmap can grow while workers peek
651 * the sessions pool, e.g., session_half_open_migrate_notify, and as a
652 * result crash while validating the session. To avoid this, grow the bitmap
656 session_t *sp = session_main.wrk[0].sessions;
657 clib_bitmap_validate (pool_header (sp)->free_bitmap, s->session_index);
662 always_inline session_t *
663 ho_session_get (u32 ho_index)
665 return session_get (ho_index, 0 /* half-open thread */);
669 ho_session_free (session_t *s)
671 ASSERT (!s->rx_fifo && s->thread_index == 0);
675 transport_connection_t *listen_session_get_transport (session_t * s);
678 * Session layer functions
681 always_inline session_main_t *
682 vnet_get_session_main ()
684 return &session_main;
687 always_inline session_worker_t *
688 session_main_get_worker (u32 thread_index)
690 return &session_main.wrk[thread_index];
693 static inline session_worker_t *
694 session_main_get_worker_if_valid (u32 thread_index)
696 if (thread_index > vec_len (session_main.wrk))
698 return &session_main.wrk[thread_index];
701 always_inline svm_msg_q_t *
702 session_main_get_vpp_event_queue (u32 thread_index)
704 return session_main.wrk[thread_index].vpp_event_queue;
708 session_main_is_enabled ()
710 return session_main.is_enabled == 1;
713 #define session_cli_return_if_not_enabled() \
715 if (!session_main.is_enabled) \
716 return clib_error_return (0, "session layer is not enabled"); \
719 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
720 int session_main_flush_all_enqueue_events (u8 transport_proto);
721 void session_queue_run_on_main_thread (vlib_main_t * vm);
724 * Add session node pending buffer with custom node
726 * @param thread_index worker thread expected to send the buffer
727 * @param bi buffer index
728 * @param next_node next node edge index for buffer. Edge to next node
732 session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node)
734 session_worker_t *wrk = session_main_get_worker (thread_index);
735 vec_add1 (wrk->pending_tx_buffers, bi);
736 vec_add1 (wrk->pending_tx_nexts, next_node);
737 if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
738 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
742 session_wrk_update_time (session_worker_t *wrk, f64 now)
744 wrk->last_vlib_time = now;
745 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
748 void session_wrk_enable_adaptive_mode (session_worker_t *wrk);
749 fifo_segment_t *session_main_get_wrk_mqs_segment (void);
750 void session_node_enable_disable (u8 is_en);
751 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
752 void session_wrk_handle_evts_main_rpc ();
754 session_t *session_alloc_for_connection (transport_connection_t * tc);
755 session_t *session_alloc_for_half_open (transport_connection_t *tc);
757 typedef void (pool_safe_realloc_rpc_fn) (void *rpc_args);
761 u8 ph[STRUCT_OFFSET_OF (pool_header_t, max_elts) + 4];
763 } pool_safe_realloc_header_t;
765 STATIC_ASSERT_SIZEOF (pool_safe_realloc_header_t, sizeof (pool_header_t));
767 #define POOL_REALLOC_SAFE_ELT_THRESH 32
769 #define pool_realloc_flag(PH) \
770 ((pool_safe_realloc_header_t *) pool_header (PH))->flag
772 #define pool_realloc_safe_aligned(P, align) \
775 vlib_main_t *vm = vlib_get_main (); \
776 u32 free_elts, max_elts, n_alloc; \
777 ASSERT (vlib_get_thread_index () == 0); \
778 vlib_worker_thread_barrier_sync (vm); \
779 free_elts = pool_free_elts (P); \
780 if (free_elts < POOL_REALLOC_SAFE_ELT_THRESH) \
782 max_elts = pool_max_len (P); \
783 n_alloc = clib_max (2 * max_elts, POOL_REALLOC_SAFE_ELT_THRESH); \
784 pool_alloc_aligned (P, free_elts + n_alloc, align); \
785 clib_bitmap_validate (pool_header (P)->free_bitmap, \
786 max_elts + n_alloc); \
788 pool_realloc_flag (P) = 0; \
789 vlib_worker_thread_barrier_release (vm); \
794 pool_program_safe_realloc (void *p, u32 thread_index,
795 pool_safe_realloc_rpc_fn *rpc_fn)
797 /* Reuse pad as a realloc flag */
798 if (pool_realloc_flag (p))
801 pool_realloc_flag (p) = 1;
802 session_send_rpc_evt_to_thread (0 /* thread index */, rpc_fn,
803 uword_to_pointer (thread_index, void *));
806 #define pool_needs_realloc(P) \
808 (vec_len (pool_header (P)->free_indices) < POOL_REALLOC_SAFE_ELT_THRESH && \
809 pool_free_elts (P) < POOL_REALLOC_SAFE_ELT_THRESH))
811 #define pool_get_aligned_safe(P, E, thread_index, rpc_fn, align) \
814 ASSERT (vlib_get_thread_index () == thread_index || \
815 vlib_thread_is_main_w_barrier ()); \
816 if (PREDICT_FALSE (pool_needs_realloc (P))) \
818 if (PREDICT_FALSE (!(P))) \
820 pool_alloc_aligned (P, 2 * POOL_REALLOC_SAFE_ELT_THRESH, \
823 else if (PREDICT_FALSE (!pool_free_elts (P))) \
825 vlib_workers_sync (); \
826 pool_alloc_aligned (P, pool_max_len (P), align); \
827 vlib_workers_continue (); \
828 ALWAYS_ASSERT (pool_free_elts (P) > 0); \
832 pool_program_safe_realloc (P, thread_index, rpc_fn); \
835 pool_get_aligned (P, E, align); \
839 #endif /* __included_session_h__ */
842 * fd.io coding-style-patch-verification: ON
845 * eval: (c-set-style "gnu")