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>
24 #include <vlib/dma/dma.h>
26 #define foreach_session_input_error \
27 _(NO_SESSION, "No session drops") \
28 _(NO_LISTENER, "No listener for dst port drops") \
29 _(ENQUEUED, "Packets pushed into rx fifo") \
30 _(NOT_READY, "Session not ready packets") \
31 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
32 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
33 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
37 #define _(sym,str) SESSION_ERROR_##sym,
38 foreach_session_input_error
41 } session_input_error_t;
43 typedef struct session_tx_context_
45 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
47 transport_proto_vft_t *transport_vft;
48 transport_connection_t *tc;
49 transport_send_params_t sp;
53 u16 deq_per_first_buf;
58 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
59 session_dgram_hdr_t hdr;
61 /** Vector of tx buffer free lists */
63 vlib_buffer_t **transport_pending_bufs;
64 } session_tx_context_t;
66 typedef struct session_evt_elt
68 clib_llist_anchor_t evt_list;
72 typedef struct session_ctrl_evt_data_
74 u8 data[SESSION_CTRL_MSG_MAX_SIZE];
75 } session_evt_ctrl_data_t;
77 typedef enum session_wrk_state_
80 SESSION_WRK_INTERRUPT,
82 } __clib_packed session_wrk_state_t;
84 typedef enum session_wrk_flags_
86 SESSION_WRK_F_ADAPTIVE = 1 << 0,
87 } __clib_packed session_wrk_flag_t;
89 #define DMA_TRANS_SIZE 1024
92 u32 *pending_tx_buffers;
93 u16 *pending_tx_nexts;
94 } session_dma_transfer;
96 typedef struct session_worker_
98 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
100 /** Worker session pool */
103 /** vpp event message queue for worker */
104 svm_msg_q_t *vpp_event_queue;
106 /** vlib_time_now last time around the track */
107 clib_time_type_t last_vlib_time;
109 /** vlib_time_now rounded to us precision and as u64 */
110 clib_us_time_t last_vlib_us_time;
112 /** Convenience pointer to this worker's vlib_main */
115 /** Per-proto vector of sessions to enqueue */
116 u32 **session_to_enqueue;
118 /** Timerfd used to periodically signal wrk session queue node */
122 session_wrk_flag_t flags;
125 session_wrk_state_t state;
127 /** Context for session tx */
128 session_tx_context_t ctx;
130 /** Pool of session event list elements */
131 session_evt_elt_t *event_elts;
133 /** Pool of ctrl events data buffers */
134 session_evt_ctrl_data_t *ctrl_evts_data;
136 /** Head of control events list */
137 clib_llist_index_t ctrl_head;
139 /** Head of list of elements */
140 clib_llist_index_t new_head;
142 /** Head of list of pending events */
143 clib_llist_index_t old_head;
145 /** Vector of buffers to be sent */
146 u32 *pending_tx_buffers;
148 /** Vector of nexts for the pending tx buffers */
149 u16 *pending_tx_nexts;
151 /** Clib file for timerfd. Used only if adaptive mode is on */
154 /** List of pending connects for first worker */
155 clib_llist_index_t pending_connects;
157 /** Flag that is set if main thread signaled to handle connects */
158 u32 n_pending_connects;
160 /** Main thread loops in poll mode without a connect */
161 u32 no_connect_loops;
163 /** List head for first worker evts pending handling on main */
164 clib_llist_index_t evts_pending_main;
168 session_dma_transfer *dma_trans;
173 vlib_dma_batch_t *batch;
176 /** last event poll time by thread */
177 clib_time_type_t last_event_poll;
181 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
182 vlib_node_runtime_t * node,
183 session_evt_elt_t * e, int *n_tx_packets);
185 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
186 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
187 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
189 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
191 typedef void (*session_update_time_fn) (f64 time_now, u8 thread_index);
193 typedef struct session_main_
195 /** Worker contexts */
196 session_worker_t *wrk;
198 /** Vector of transport update time functions */
199 session_update_time_fn *update_time_fns;
201 /** Event queues memfd segment */
202 fifo_segment_t wrk_mqs_segment;
204 /** Unique segment name counter */
205 u32 unique_segment_name_counter;
207 /** Per transport rx function that can either dequeue or peek */
208 session_fifo_rx_fn **session_tx_fns;
210 /** Per session type output nodes. Could optimize to group nodes by
211 * fib but lookup would then require session type parsing in session node.
212 * Trade memory for speed, for now */
213 u32 *session_type_to_next;
215 /** Thread for cl and ho that rely on cl allocs */
216 u32 transport_cl_thread;
218 transport_proto_t last_transport_proto_type;
220 /** Number of workers at pool realloc barrier */
221 volatile u32 pool_realloc_at_barrier;
223 /** Number of workers doing reallocs */
224 volatile u32 pool_realloc_doing_work;
226 /** Lock to synchronize parallel forced reallocs */
227 clib_spinlock_t pool_realloc_lock;
233 /** Session manager is enabled */
236 /** Session manager initialized (not necessarily enabled) */
239 /** Enable session manager at startup */
240 u8 session_enable_asap;
242 /** Poll session node in main thread */
245 /** Allocate private rx mqs for external apps */
246 u8 use_private_rx_mqs;
248 /** Do not enable session queue node adaptive mode */
251 /** vpp fifo event queue configured length */
252 u32 configured_wrk_mq_length;
254 /** Session ssvm segment configs*/
255 uword wrk_mqs_segment_size;
257 /** Session enable dma*/
260 /** Session table size parameters */
261 u32 configured_v4_session_table_buckets;
262 u32 configured_v4_session_table_memory;
263 u32 configured_v4_halfopen_table_buckets;
264 u32 configured_v4_halfopen_table_memory;
265 u32 configured_v6_session_table_buckets;
266 u32 configured_v6_session_table_memory;
267 u32 configured_v6_halfopen_table_buckets;
268 u32 configured_v6_halfopen_table_memory;
270 /** Transport table (preallocation) size parameters */
271 u32 local_endpoints_table_memory;
272 u32 local_endpoints_table_buckets;
274 /** Preallocate session config parameter */
275 u32 preallocated_sessions;
280 extern session_main_t session_main;
281 extern vlib_node_registration_t session_queue_node;
282 extern vlib_node_registration_t session_queue_process_node;
283 extern vlib_node_registration_t session_queue_pre_input_node;
285 typedef enum session_q_process_evt_
287 SESSION_Q_PROCESS_RUN_ON_MAIN = 1,
288 SESSION_Q_PROCESS_STOP
289 } session_q_process_evt_t;
291 #define TRANSPORT_PROTO_INVALID (session_main.last_transport_proto_type + 1)
292 #define TRANSPORT_N_PROTOS (session_main.last_transport_proto_type + 1)
295 session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt)
297 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
298 clib_llist_elt (wrk->event_elts, wrk->old_head));
302 session_evt_add_head_old (session_worker_t * wrk, session_evt_elt_t * elt)
304 clib_llist_add (wrk->event_elts, evt_list, elt,
305 clib_llist_elt (wrk->event_elts, wrk->old_head));
310 session_evt_ctrl_data_alloc (session_worker_t * wrk)
312 session_evt_ctrl_data_t *data;
313 pool_get (wrk->ctrl_evts_data, data);
314 return (data - wrk->ctrl_evts_data);
317 static inline session_evt_elt_t *
318 session_evt_alloc_ctrl (session_worker_t * wrk)
320 session_evt_elt_t *elt;
321 clib_llist_get (wrk->event_elts, elt);
322 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
323 clib_llist_elt (wrk->event_elts, wrk->ctrl_head));
328 session_evt_ctrl_data (session_worker_t * wrk, session_evt_elt_t * elt)
330 return (void *) (pool_elt_at_index (wrk->ctrl_evts_data,
331 elt->evt.ctrl_data_index));
335 session_evt_ctrl_data_free (session_worker_t * wrk, session_evt_elt_t * elt)
337 ASSERT (elt->evt.event_type > SESSION_IO_EVT_BUILTIN_TX);
338 pool_put_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index);
341 static inline session_evt_elt_t *
342 session_evt_alloc_new (session_worker_t * wrk)
344 session_evt_elt_t *elt;
345 clib_llist_get (wrk->event_elts, elt);
346 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
347 clib_llist_elt (wrk->event_elts, wrk->new_head));
351 static inline session_evt_elt_t *
352 session_evt_alloc_old (session_worker_t * wrk)
354 session_evt_elt_t *elt;
355 clib_llist_get (wrk->event_elts, elt);
356 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
357 clib_llist_elt (wrk->event_elts, wrk->old_head));
361 int session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq);
363 session_t *session_alloc (u32 thread_index);
364 void session_free (session_t * s);
365 void session_free_w_fifos (session_t * s);
366 void session_cleanup_half_open (session_handle_t ho_handle);
367 u8 session_is_valid (u32 si, u8 thread_index);
369 always_inline session_t *
370 session_get (u32 si, u32 thread_index)
372 ASSERT (session_is_valid (si, thread_index));
373 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
376 always_inline session_t *
377 session_get_if_valid (u64 si, u32 thread_index)
379 if (thread_index >= vec_len (session_main.wrk))
382 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
385 ASSERT (session_is_valid (si, thread_index));
386 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
389 always_inline session_t *
390 session_get_from_handle (session_handle_t handle)
392 session_main_t *smm = &session_main;
393 u32 session_index, thread_index;
394 session_parse_handle (handle, &session_index, &thread_index);
395 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
398 always_inline session_t *
399 session_get_from_handle_if_valid (session_handle_t handle)
401 u32 session_index, thread_index;
402 session_parse_handle (handle, &session_index, &thread_index);
403 return session_get_if_valid (session_index, thread_index);
406 u64 session_segment_handle (session_t * s);
409 * Get session from handle and avoid pool validation if no same thread
411 * Peekers are fine because pool grows with barrier (see @ref session_alloc)
413 always_inline session_t *
414 session_get_from_handle_safe (u64 handle)
416 u32 thread_index = session_thread_from_handle (handle);
417 session_worker_t *wrk = &session_main.wrk[thread_index];
419 if (thread_index == vlib_get_thread_index ())
421 return pool_elt_at_index (wrk->sessions,
422 session_index_from_handle (handle));
426 /* Don't use pool_elt_at index to avoid pool bitmap reallocs */
427 return wrk->sessions + session_index_from_handle (handle);
431 always_inline session_t *
432 session_clone_safe (u32 session_index, u32 thread_index)
434 u32 current_thread_index = vlib_get_thread_index (), new_index;
435 session_t *old_s, *new_s;
437 new_s = session_alloc (current_thread_index);
438 new_index = new_s->session_index;
439 /* Session pools are reallocated with barrier (see @ref session_alloc) */
440 old_s = session_main.wrk[thread_index].sessions + session_index;
441 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
442 new_s->thread_index = current_thread_index;
443 new_s->session_index = new_index;
447 int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh);
448 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
449 int session_stop_listen (session_t * s);
450 void session_half_close (session_t *s);
451 void session_close (session_t * s);
452 void session_reset (session_t * s);
453 void session_transport_half_close (session_t *s);
454 void session_transport_close (session_t * s);
455 void session_transport_reset (session_t * s);
456 void session_transport_cleanup (session_t * s);
457 int session_send_io_evt_to_thread (svm_fifo_t * f,
458 session_evt_type_t evt_type);
459 int session_enqueue_notify (session_t * s);
460 int session_dequeue_notify (session_t * s);
461 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
462 session_evt_type_t evt_type);
463 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
465 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
467 void session_add_self_custom_tx_evt (transport_connection_t * tc,
469 void sesssion_reschedule_tx (transport_connection_t * tc);
470 transport_connection_t *session_get_transport (session_t * s);
471 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
473 int session_transport_attribute (session_t *s, u8 is_get,
474 transport_endpt_attr_t *attr);
476 u8 *format_session (u8 * s, va_list * args);
477 uword unformat_session (unformat_input_t * input, va_list * args);
478 uword unformat_transport_connection (unformat_input_t * input,
482 * Interface to transport protos
485 int session_enqueue_stream_connection (transport_connection_t * tc,
486 vlib_buffer_t * b, u32 offset,
487 u8 queue_event, u8 is_in_order);
488 int session_enqueue_dgram_connection (session_t * s,
489 session_dgram_hdr_t * hdr,
490 vlib_buffer_t * b, u8 proto,
492 int session_stream_connect_notify (transport_connection_t * tc,
493 session_error_t err);
494 int session_dgram_connect_notify (transport_connection_t * tc,
495 u32 old_thread_index,
496 session_t ** new_session);
497 int session_stream_accept_notify (transport_connection_t * tc);
498 void session_transport_closing_notify (transport_connection_t * tc);
499 void session_transport_delete_notify (transport_connection_t * tc);
500 void session_half_open_delete_notify (transport_connection_t *tc);
501 void session_half_open_migrate_notify (transport_connection_t *tc);
502 int session_half_open_migrated_notify (transport_connection_t *tc);
503 void session_transport_closed_notify (transport_connection_t * tc);
504 void session_transport_reset_notify (transport_connection_t * tc);
505 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
506 u32 thread_index, u8 notify);
507 int session_dgram_accept (transport_connection_t * tc, u32 listener_index,
510 * Initialize session layer for given transport proto and ip version
512 * Allocates per session type (transport proto + ip version) data structures
513 * and adds arc from session queue node to session type output node.
515 * @param transport_proto transport proto to be registered
516 * @param vft virtual function table for transport
517 * @param is_ip4 flag that indicates if transports uses ipv4
518 * as underlying network layer
519 * @param output_node output node for transport
521 void session_register_transport (transport_proto_t transport_proto,
522 const transport_proto_vft_t * vft, u8 is_ip4,
524 transport_proto_t session_add_transport_proto (void);
525 void session_register_update_time_fn (session_update_time_fn fn, u8 is_add);
526 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
527 u32 offset, u32 max_bytes);
528 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
531 session_set_state (session_t *s, session_state_t session_state)
533 s->session_state = session_state;
534 SESSION_EVT (SESSION_EVT_STATE_CHANGE, s);
538 transport_max_rx_enqueue (transport_connection_t * tc)
540 session_t *s = session_get (tc->s_index, tc->thread_index);
541 return svm_fifo_max_enqueue_prod (s->rx_fifo);
545 transport_max_tx_dequeue (transport_connection_t * tc)
547 session_t *s = session_get (tc->s_index, tc->thread_index);
548 return svm_fifo_max_dequeue_cons (s->tx_fifo);
552 transport_max_rx_dequeue (transport_connection_t * tc)
554 session_t *s = session_get (tc->s_index, tc->thread_index);
555 return svm_fifo_max_dequeue (s->rx_fifo);
559 transport_rx_fifo_size (transport_connection_t * tc)
561 session_t *s = session_get (tc->s_index, tc->thread_index);
562 return svm_fifo_size (s->rx_fifo);
566 transport_tx_fifo_size (transport_connection_t * tc)
568 session_t *s = session_get (tc->s_index, tc->thread_index);
569 return svm_fifo_size (s->tx_fifo);
573 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
575 session_t *s = session_get (tc->c_index, tc->thread_index);
576 return svm_fifo_has_ooo_data (s->rx_fifo);
580 transport_rx_fifo_req_deq_ntf (transport_connection_t *tc)
582 session_t *s = session_get (tc->s_index, tc->thread_index);
583 svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF);
586 always_inline clib_time_type_t
587 transport_time_now (u32 thread_index)
589 return session_main.wrk[thread_index].last_vlib_time;
592 always_inline clib_us_time_t
593 transport_us_time_now (u32 thread_index)
595 return session_main.wrk[thread_index].last_vlib_us_time;
598 always_inline clib_time_type_t
599 transport_seconds_per_loop (u32 thread_index)
601 return session_main.wrk[thread_index].vm->seconds_per_loop;
605 transport_add_tx_event (transport_connection_t * tc)
607 session_t *s = session_get (tc->s_index, tc->thread_index);
608 if (svm_fifo_has_event (s->tx_fifo))
610 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
614 transport_cl_thread (void)
616 return session_main.transport_cl_thread;
624 listen_session_get_handle (session_t * s)
626 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
627 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
628 return session_handle (s);
631 always_inline session_t *
632 listen_session_get_from_handle (session_handle_t handle)
634 return session_get_from_handle (handle);
638 listen_session_parse_handle (session_handle_t handle, u32 * index,
641 session_parse_handle (handle, index, thread_index);
644 always_inline session_t *
645 listen_session_alloc (u8 thread_index, session_type_t type)
648 s = session_alloc (thread_index);
649 s->session_type = type;
650 s->session_state = SESSION_STATE_LISTENING;
654 always_inline session_t *
655 listen_session_get (u32 ls_index)
657 return session_get (ls_index, 0);
661 listen_session_free (session_t * s)
663 ASSERT (!s->rx_fifo);
667 always_inline session_t *
668 ho_session_alloc (void)
671 ASSERT (vlib_get_thread_index () == 0);
672 s = session_alloc (0);
673 s->session_state = SESSION_STATE_CONNECTING;
674 s->flags |= SESSION_F_HALF_OPEN;
675 /* Not ideal. Half-opens are only allocated from main with worker barrier
676 * but can be cleaned up, i.e., session_half_open_free, from main without
677 * a barrier. In debug images, the free_bitmap can grow while workers peek
678 * the sessions pool, e.g., session_half_open_migrate_notify, and as a
679 * result crash while validating the session. To avoid this, grow the bitmap
683 session_t *sp = session_main.wrk[0].sessions;
684 clib_bitmap_validate (pool_header (sp)->free_bitmap,
685 s->session_index + 1);
690 always_inline session_t *
691 ho_session_get (u32 ho_index)
693 return session_get (ho_index, 0 /* half-open thread */);
697 ho_session_free (session_t *s)
699 ASSERT (!s->rx_fifo && s->thread_index == 0);
703 transport_connection_t *listen_session_get_transport (session_t * s);
706 * Session layer functions
709 always_inline session_main_t *
710 vnet_get_session_main ()
712 return &session_main;
715 always_inline session_worker_t *
716 session_main_get_worker (u32 thread_index)
718 return &session_main.wrk[thread_index];
721 static inline session_worker_t *
722 session_main_get_worker_if_valid (u32 thread_index)
724 if (thread_index > vec_len (session_main.wrk))
726 return &session_main.wrk[thread_index];
729 always_inline svm_msg_q_t *
730 session_main_get_vpp_event_queue (u32 thread_index)
732 return session_main.wrk[thread_index].vpp_event_queue;
736 session_main_is_enabled ()
738 return session_main.is_enabled == 1;
741 #define session_cli_return_if_not_enabled() \
743 if (!session_main.is_enabled) \
744 return clib_error_return (0, "session layer is not enabled"); \
747 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
748 int session_main_flush_all_enqueue_events (u8 transport_proto);
749 void session_queue_run_on_main_thread (vlib_main_t * vm);
752 * Add session node pending buffer with custom node
754 * @param thread_index worker thread expected to send the buffer
755 * @param bi buffer index
756 * @param next_node next node edge index for buffer. Edge to next node
760 session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node)
762 session_worker_t *wrk = session_main_get_worker (thread_index);
763 vec_add1 (wrk->pending_tx_buffers, bi);
764 vec_add1 (wrk->pending_tx_nexts, next_node);
765 if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
766 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
770 session_wrk_update_time (session_worker_t *wrk, f64 now)
772 wrk->last_vlib_time = now;
773 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
776 void session_wrk_enable_adaptive_mode (session_worker_t *wrk);
777 fifo_segment_t *session_main_get_wrk_mqs_segment (void);
778 void session_node_enable_disable (u8 is_en);
779 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
780 void session_wrk_handle_evts_main_rpc (void *);
782 session_t *session_alloc_for_connection (transport_connection_t * tc);
783 session_t *session_alloc_for_half_open (transport_connection_t *tc);
785 typedef void (pool_safe_realloc_rpc_fn) (void *rpc_args);
789 u8 ph[STRUCT_OFFSET_OF (pool_header_t, max_elts) + 4];
791 } pool_safe_realloc_header_t;
793 STATIC_ASSERT_SIZEOF (pool_safe_realloc_header_t, sizeof (pool_header_t));
795 #define POOL_REALLOC_SAFE_ELT_THRESH 32
797 #define pool_realloc_flag(PH) \
798 ((pool_safe_realloc_header_t *) pool_header (PH))->flag
800 typedef struct pool_realloc_rpc_args_
805 } pool_realloc_rpc_args_t;
808 pool_program_safe_realloc_rpc (void *args)
810 vlib_main_t *vm = vlib_get_main ();
811 u32 free_elts, max_elts, n_alloc;
812 pool_realloc_rpc_args_t *pra;
814 ASSERT (vlib_get_thread_index () == 0);
815 pra = (pool_realloc_rpc_args_t *) args;
817 vlib_worker_thread_barrier_sync (vm);
819 free_elts = _pool_free_elts (*pra->pool, pra->elt_size);
820 if (free_elts < POOL_REALLOC_SAFE_ELT_THRESH)
822 max_elts = _vec_max_len (*pra->pool, pra->elt_size);
823 n_alloc = clib_max (2 * max_elts, POOL_REALLOC_SAFE_ELT_THRESH);
824 _pool_alloc (pra->pool, n_alloc, pra->align, 0, pra->elt_size);
826 pool_realloc_flag (*pra->pool) = 0;
827 clib_mem_free (args);
829 vlib_worker_thread_barrier_release (vm);
833 pool_program_safe_realloc (void **p, u32 elt_size, u32 align)
835 pool_realloc_rpc_args_t *pra;
837 /* Reuse pad as a realloc flag */
838 if (pool_realloc_flag (*p))
841 pra = clib_mem_alloc (sizeof (*pra));
843 pra->elt_size = elt_size;
845 pool_realloc_flag (*p) = 1;
847 session_send_rpc_evt_to_thread (0 /* thread index */,
848 pool_program_safe_realloc_rpc, pra);
851 #define pool_needs_realloc(P) \
853 (vec_len (pool_header (P)->free_indices) < POOL_REALLOC_SAFE_ELT_THRESH && \
854 pool_free_elts (P) < POOL_REALLOC_SAFE_ELT_THRESH))
856 #define pool_get_aligned_safe(P, E, align) \
859 if (PREDICT_FALSE (pool_needs_realloc (P))) \
861 if (PREDICT_FALSE (!(P))) \
863 pool_alloc_aligned (P, POOL_REALLOC_SAFE_ELT_THRESH, align); \
865 else if (PREDICT_FALSE (!pool_free_elts (P))) \
867 vlib_workers_sync (); \
868 pool_alloc_aligned (P, pool_max_len (P), align); \
869 vlib_workers_continue (); \
870 ALWAYS_ASSERT (pool_free_elts (P) > 0); \
874 pool_program_safe_realloc ((void **) &(P), sizeof ((P)[0]), \
875 _vec_align (P, align)); \
878 pool_get_aligned (P, E, align); \
882 #endif /* __included_session_h__ */
885 * fd.io coding-style-patch-verification: ON
888 * eval: (c-set-style "gnu")