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 typedef struct session_wrk_stats_
28 u32 errors[SESSION_N_ERRORS];
29 } session_wrk_stats_t;
31 typedef struct session_tx_context_
33 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
35 transport_proto_vft_t *transport_vft;
36 transport_connection_t *tc;
37 transport_send_params_t sp;
41 u16 deq_per_first_buf;
46 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
47 session_dgram_hdr_t hdr;
49 /** Vector of tx buffer free lists */
51 vlib_buffer_t **transport_pending_bufs;
52 } session_tx_context_t;
54 typedef struct session_evt_elt
56 clib_llist_anchor_t evt_list;
60 typedef struct session_ctrl_evt_data_
62 u8 data[SESSION_CTRL_MSG_MAX_SIZE];
63 } session_evt_ctrl_data_t;
65 typedef enum session_wrk_state_
68 SESSION_WRK_INTERRUPT,
70 } __clib_packed session_wrk_state_t;
72 typedef enum session_wrk_flags_
74 SESSION_WRK_F_ADAPTIVE = 1 << 0,
75 } __clib_packed session_wrk_flag_t;
77 #define DMA_TRANS_SIZE 1024
80 u32 *pending_tx_buffers;
81 u16 *pending_tx_nexts;
82 } session_dma_transfer;
84 typedef struct session_worker_
86 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
88 /** Worker session pool */
91 /** vpp event message queue for worker */
92 svm_msg_q_t *vpp_event_queue;
94 /** vlib_time_now last time around the track */
95 clib_time_type_t last_vlib_time;
97 /** vlib_time_now rounded to us precision and as u64 */
98 clib_us_time_t last_vlib_us_time;
100 /** Convenience pointer to this worker's vlib_main */
103 /** Per-proto vector of session handles to enqueue */
104 session_handle_t **session_to_enqueue;
106 /** Timerfd used to periodically signal wrk session queue node */
110 session_wrk_flag_t flags;
113 session_wrk_state_t state;
115 /** Context for session tx */
116 session_tx_context_t ctx;
118 /** Pool of session event list elements */
119 session_evt_elt_t *event_elts;
121 /** Pool of ctrl events data buffers */
122 session_evt_ctrl_data_t *ctrl_evts_data;
124 /** Head of control events list */
125 clib_llist_index_t ctrl_head;
127 /** Head of list of elements */
128 clib_llist_index_t new_head;
130 /** Head of list of pending events */
131 clib_llist_index_t old_head;
133 /** Vector of buffers to be sent */
134 u32 *pending_tx_buffers;
136 /** Vector of nexts for the pending tx buffers */
137 u16 *pending_tx_nexts;
139 /** Clib file for timerfd. Used only if adaptive mode is on */
142 /** List of pending connects for first worker */
143 clib_llist_index_t pending_connects;
145 /** Flag that is set if main thread signaled to handle connects */
146 u32 n_pending_connects;
148 /** List head for first worker evts pending handling on main */
149 clib_llist_index_t evts_pending_main;
151 /** Per-app-worker bitmap of pending notifications */
152 uword *app_wrks_pending_ntf;
156 session_dma_transfer *dma_trans;
161 vlib_dma_batch_t *batch;
163 session_wrk_stats_t stats;
166 /** last event poll time by thread */
167 clib_time_type_t last_event_poll;
171 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
172 vlib_node_runtime_t * node,
173 session_evt_elt_t * e, int *n_tx_packets);
175 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
176 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
177 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
179 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
181 typedef void (*session_update_time_fn) (f64 time_now, u8 thread_index);
182 typedef void (*nat44_original_dst_lookup_fn) (
183 ip4_address_t *i2o_src, u16 i2o_src_port, ip4_address_t *i2o_dst,
184 u16 i2o_dst_port, ip_protocol_t proto, u32 *original_dst,
185 u16 *original_dst_port);
187 typedef struct session_main_
189 /** Worker contexts */
190 session_worker_t *wrk;
192 /** Vector of transport update time functions */
193 session_update_time_fn *update_time_fns;
195 /** Event queues memfd segment */
196 fifo_segment_t wrk_mqs_segment;
198 /** Unique segment name counter */
199 u32 unique_segment_name_counter;
201 /** Per transport rx function that can either dequeue or peek */
202 session_fifo_rx_fn **session_tx_fns;
204 /** Per session type output nodes. Could optimize to group nodes by
205 * fib but lookup would then require session type parsing in session node.
206 * Trade memory for speed, for now */
207 u32 *session_type_to_next;
209 /** Thread used for allocating active open connections, i.e., half-opens
210 * for transports like tcp, and sessions that will be migrated for cl
211 * transports like udp. If vpp has workers, this will be first worker. */
212 u32 transport_cl_thread;
214 transport_proto_t last_transport_proto_type;
216 /** Number of workers at pool realloc barrier */
217 volatile u32 pool_realloc_at_barrier;
219 /** Number of workers doing reallocs */
220 volatile u32 pool_realloc_doing_work;
222 /** Lock to synchronize parallel forced reallocs */
223 clib_spinlock_t pool_realloc_lock;
229 /** Session manager is enabled */
232 /** Session manager initialized (not necessarily enabled) */
235 /** Enable session manager at startup */
236 u8 session_enable_asap;
238 /** Poll session node in main thread */
241 /** Allocate private rx mqs for external apps */
242 u8 use_private_rx_mqs;
244 /** Do not enable session queue node adaptive mode */
247 /** vpp fifo event queue configured length */
248 u32 configured_wrk_mq_length;
250 /** Session ssvm segment configs*/
251 uword wrk_mqs_segment_size;
253 /** Session enable dma*/
256 /** Session table size parameters */
257 u32 configured_v4_session_table_buckets;
258 u32 configured_v4_session_table_memory;
259 u32 configured_v4_halfopen_table_buckets;
260 u32 configured_v4_halfopen_table_memory;
261 u32 configured_v6_session_table_buckets;
262 u32 configured_v6_session_table_memory;
263 u32 configured_v6_halfopen_table_buckets;
264 u32 configured_v6_halfopen_table_memory;
266 /** Transport table (preallocation) size parameters */
267 u32 local_endpoints_table_memory;
268 u32 local_endpoints_table_buckets;
270 /** Preallocate session config parameter */
271 u32 preallocated_sessions;
275 /** Query nat44-ed session to get original dst ip4 & dst port. */
276 nat44_original_dst_lookup_fn original_dst_lookup;
279 extern session_main_t session_main;
280 extern vlib_node_registration_t session_queue_node;
281 extern vlib_node_registration_t session_input_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_CTRL_EVT_RPC);
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_cleanup (session_t *s);
366 void session_program_cleanup (session_t *s);
367 void session_cleanup_half_open (session_handle_t ho_handle);
368 u8 session_is_valid (u32 si, u8 thread_index);
370 always_inline session_t *
371 session_get (u32 si, u32 thread_index)
373 ASSERT (session_is_valid (si, thread_index));
374 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
377 always_inline session_t *
378 session_get_if_valid (u64 si, u32 thread_index)
380 if (thread_index >= vec_len (session_main.wrk))
383 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
386 ASSERT (session_is_valid (si, thread_index));
387 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
390 always_inline session_t *
391 session_get_from_handle (session_handle_t handle)
393 session_main_t *smm = &session_main;
394 u32 session_index, thread_index;
395 session_parse_handle (handle, &session_index, &thread_index);
396 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
399 always_inline session_t *
400 session_get_from_handle_if_valid (session_handle_t handle)
402 u32 session_index, thread_index;
403 session_parse_handle (handle, &session_index, &thread_index);
404 return session_get_if_valid (session_index, thread_index);
407 u64 session_segment_handle (session_t * s);
410 * Get session from handle and avoid pool validation if no same thread
412 * Peekers are fine because pool grows with barrier (see @ref session_alloc)
414 always_inline session_t *
415 session_get_from_handle_safe (u64 handle)
417 u32 thread_index = session_thread_from_handle (handle);
418 session_worker_t *wrk = &session_main.wrk[thread_index];
420 if (thread_index == vlib_get_thread_index ())
422 return pool_elt_at_index (wrk->sessions,
423 session_index_from_handle (handle));
427 /* Don't use pool_elt_at index to avoid pool bitmap reallocs */
428 return wrk->sessions + session_index_from_handle (handle);
432 always_inline session_t *
433 session_clone_safe (u32 session_index, u32 thread_index)
435 u32 current_thread_index = vlib_get_thread_index (), new_index;
436 session_t *old_s, *new_s;
438 new_s = session_alloc (current_thread_index);
439 new_index = new_s->session_index;
440 /* Session pools are reallocated with barrier (see @ref session_alloc) */
441 old_s = session_main.wrk[thread_index].sessions + session_index;
442 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
443 new_s->thread_index = current_thread_index;
444 new_s->session_index = new_index;
448 int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh);
449 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
450 int session_stop_listen (session_t * s);
451 void session_half_close (session_t *s);
452 void session_close (session_t * s);
453 void session_reset (session_t * s);
454 void session_transport_half_close (session_t *s);
455 void session_transport_close (session_t * s);
456 void session_transport_reset (session_t * s);
457 void session_transport_cleanup (session_t * s);
458 int session_send_io_evt_to_thread (svm_fifo_t * f,
459 session_evt_type_t evt_type);
460 int session_enqueue_notify (session_t *s);
461 int session_dequeue_notify (session_t * s);
462 int session_enqueue_notify_cl (session_t *s);
463 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
464 session_evt_type_t evt_type);
465 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
467 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
469 void session_add_self_custom_tx_evt (transport_connection_t * tc,
471 void sesssion_reschedule_tx (transport_connection_t * tc);
472 transport_connection_t *session_get_transport (session_t * s);
473 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
475 int session_transport_attribute (session_t *s, u8 is_get,
476 transport_endpt_attr_t *attr);
478 u8 *format_session (u8 * s, va_list * args);
479 uword unformat_session (unformat_input_t * input, va_list * args);
480 uword unformat_transport_connection (unformat_input_t * input,
484 * Interface to transport protos
487 int session_enqueue_stream_connection (transport_connection_t * tc,
488 vlib_buffer_t * b, u32 offset,
489 u8 queue_event, u8 is_in_order);
490 int session_enqueue_dgram_connection (session_t * s,
491 session_dgram_hdr_t * hdr,
492 vlib_buffer_t * b, u8 proto,
494 int session_enqueue_dgram_connection_cl (session_t *s,
495 session_dgram_hdr_t *hdr,
496 vlib_buffer_t *b, u8 proto,
498 int session_stream_connect_notify (transport_connection_t * tc,
499 session_error_t err);
500 int session_dgram_connect_notify (transport_connection_t * tc,
501 u32 old_thread_index,
502 session_t ** new_session);
503 int session_stream_accept_notify (transport_connection_t * tc);
504 void session_transport_closing_notify (transport_connection_t * tc);
505 void session_transport_delete_notify (transport_connection_t * tc);
506 void session_half_open_delete_notify (transport_connection_t *tc);
507 void session_half_open_migrate_notify (transport_connection_t *tc);
508 int session_half_open_migrated_notify (transport_connection_t *tc);
509 void session_transport_closed_notify (transport_connection_t * tc);
510 void session_transport_reset_notify (transport_connection_t * tc);
511 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
512 u32 thread_index, u8 notify);
513 int session_dgram_accept (transport_connection_t * tc, u32 listener_index,
517 * Initialize session layer for given transport proto and ip version
519 * Allocates per session type (transport proto + ip version) data structures
520 * and adds arc from session queue node to session type output node.
522 * @param transport_proto transport proto to be registered
523 * @param vft virtual function table for transport
524 * @param is_ip4 flag that indicates if transports uses ipv4
525 * as underlying network layer
526 * @param output_node output node for transport
528 void session_register_transport (transport_proto_t transport_proto,
529 const transport_proto_vft_t * vft, u8 is_ip4,
531 transport_proto_t session_add_transport_proto (void);
532 void session_register_update_time_fn (session_update_time_fn fn, u8 is_add);
533 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
534 u32 offset, u32 max_bytes);
535 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
538 session_set_state (session_t *s, session_state_t session_state)
540 s->session_state = session_state;
541 SESSION_EVT (SESSION_EVT_STATE_CHANGE, s);
545 transport_max_rx_enqueue (transport_connection_t * tc)
547 session_t *s = session_get (tc->s_index, tc->thread_index);
548 return svm_fifo_max_enqueue_prod (s->rx_fifo);
552 transport_max_tx_dequeue (transport_connection_t * tc)
554 session_t *s = session_get (tc->s_index, tc->thread_index);
555 return svm_fifo_max_dequeue_cons (s->tx_fifo);
559 transport_max_rx_dequeue (transport_connection_t * tc)
561 session_t *s = session_get (tc->s_index, tc->thread_index);
562 return svm_fifo_max_dequeue (s->rx_fifo);
566 transport_rx_fifo_size (transport_connection_t * tc)
568 session_t *s = session_get (tc->s_index, tc->thread_index);
569 return svm_fifo_size (s->rx_fifo);
573 transport_tx_fifo_size (transport_connection_t * tc)
575 session_t *s = session_get (tc->s_index, tc->thread_index);
576 return svm_fifo_size (s->tx_fifo);
580 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
582 session_t *s = session_get (tc->c_index, tc->thread_index);
583 return svm_fifo_has_ooo_data (s->rx_fifo);
587 transport_tx_fifo_has_dgram (transport_connection_t *tc)
589 session_t *s = session_get (tc->s_index, tc->thread_index);
590 u32 max_deq = svm_fifo_max_dequeue_cons (s->tx_fifo);
591 session_dgram_pre_hdr_t phdr;
593 if (max_deq <= sizeof (session_dgram_hdr_t))
595 svm_fifo_peek (s->tx_fifo, 0, sizeof (phdr), (u8 *) &phdr);
596 return max_deq >= phdr.data_length + sizeof (session_dgram_hdr_t);
600 transport_rx_fifo_req_deq_ntf (transport_connection_t *tc)
602 session_t *s = session_get (tc->s_index, tc->thread_index);
603 svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF);
606 always_inline clib_time_type_t
607 transport_time_now (u32 thread_index)
609 return session_main.wrk[thread_index].last_vlib_time;
612 always_inline clib_us_time_t
613 transport_us_time_now (u32 thread_index)
615 return session_main.wrk[thread_index].last_vlib_us_time;
618 always_inline clib_time_type_t
619 transport_seconds_per_loop (u32 thread_index)
621 return session_main.wrk[thread_index].vm->seconds_per_loop;
625 transport_add_tx_event (transport_connection_t * tc)
627 session_t *s = session_get (tc->s_index, tc->thread_index);
628 if (svm_fifo_has_event (s->tx_fifo))
630 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
634 transport_cl_thread (void)
636 return session_main.transport_cl_thread;
640 session_vlib_thread_is_cl_thread (void)
642 return (vlib_get_thread_index () == transport_cl_thread () ||
643 vlib_thread_is_main_w_barrier ());
651 listen_session_get_handle (session_t * s)
653 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
654 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
655 return session_handle (s);
658 always_inline session_t *
659 listen_session_get_from_handle (session_handle_t handle)
661 return session_get_from_handle (handle);
665 listen_session_parse_handle (session_handle_t handle, u32 * index,
668 session_parse_handle (handle, index, thread_index);
671 always_inline session_t *
672 listen_session_alloc (u8 thread_index, session_type_t type)
675 s = session_alloc (thread_index);
676 s->session_type = type;
677 s->session_state = SESSION_STATE_LISTENING;
681 always_inline session_t *
682 listen_session_get (u32 ls_index)
684 return session_get (ls_index, 0);
688 listen_session_free (session_t * s)
690 ASSERT (!s->rx_fifo);
694 always_inline session_t *
695 ho_session_alloc (void)
698 ASSERT (session_vlib_thread_is_cl_thread ());
699 s = session_alloc (transport_cl_thread ());
700 s->session_state = SESSION_STATE_CONNECTING;
701 s->flags |= SESSION_F_HALF_OPEN;
705 always_inline session_t *
706 ho_session_get (u32 ho_index)
708 return session_get (ho_index, transport_cl_thread ());
712 ho_session_free (session_t *s)
714 ASSERT (!s->rx_fifo && s->thread_index == 0);
718 transport_connection_t *listen_session_get_transport (session_t * s);
721 * Session layer functions
724 always_inline session_main_t *
725 vnet_get_session_main ()
727 return &session_main;
730 always_inline session_worker_t *
731 session_main_get_worker (u32 thread_index)
733 return vec_elt_at_index (session_main.wrk, thread_index);
736 static inline session_worker_t *
737 session_main_get_worker_if_valid (u32 thread_index)
739 if (thread_index > vec_len (session_main.wrk))
741 return session_main_get_worker (thread_index);
744 always_inline svm_msg_q_t *
745 session_main_get_vpp_event_queue (u32 thread_index)
747 return session_main_get_worker (thread_index)->vpp_event_queue;
751 session_main_is_enabled ()
753 return session_main.is_enabled == 1;
757 session_worker_stat_error_inc (session_worker_t *wrk, int error, int value)
759 if ((-(error) >= 0 && -(error) < SESSION_N_ERRORS))
760 wrk->stats.errors[-error] += value;
762 SESSION_DBG ("unknown session counter");
766 session_stat_error_inc (int error, int value)
768 session_worker_t *wrk;
769 wrk = session_main_get_worker (vlib_get_thread_index ());
770 session_worker_stat_error_inc (wrk, error, value);
773 #define session_cli_return_if_not_enabled() \
775 if (!session_main.is_enabled) \
776 return clib_error_return (0, "session layer is not enabled"); \
779 void session_main_flush_enqueue_events (transport_proto_t transport_proto,
781 void session_queue_run_on_main_thread (vlib_main_t * vm);
784 * Add session node pending buffer with custom node
786 * @param thread_index worker thread expected to send the buffer
787 * @param bi buffer index
788 * @param next_node next node edge index for buffer. Edge to next node
792 session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node)
794 session_worker_t *wrk = session_main_get_worker (thread_index);
795 vec_add1 (wrk->pending_tx_buffers, bi);
796 vec_add1 (wrk->pending_tx_nexts, next_node);
797 if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
798 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
802 session_wrk_update_time (session_worker_t *wrk, f64 now)
804 wrk->last_vlib_time = now;
805 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
808 void session_wrk_enable_adaptive_mode (session_worker_t *wrk);
809 fifo_segment_t *session_main_get_wrk_mqs_segment (void);
810 void session_node_enable_disable (u8 is_en);
811 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
812 void session_wrk_handle_evts_main_rpc (void *);
813 void session_wrk_program_app_wrk_evts (session_worker_t *wrk,
816 session_t *session_alloc_for_connection (transport_connection_t * tc);
817 session_t *session_alloc_for_half_open (transport_connection_t *tc);
818 void session_get_original_dst (transport_endpoint_t *i2o_src,
819 transport_endpoint_t *i2o_dst,
820 transport_proto_t transport_proto,
821 u32 *original_dst, u16 *original_dst_port);
823 typedef void (pool_safe_realloc_rpc_fn) (void *rpc_args);
827 u8 ph[STRUCT_OFFSET_OF (pool_header_t, max_elts) + 4];
829 } pool_safe_realloc_header_t;
831 STATIC_ASSERT_SIZEOF (pool_safe_realloc_header_t, sizeof (pool_header_t));
833 #define POOL_REALLOC_SAFE_ELT_THRESH 32
835 #define pool_realloc_flag(PH) \
836 ((pool_safe_realloc_header_t *) pool_header (PH))->flag
838 typedef struct pool_realloc_rpc_args_
843 } pool_realloc_rpc_args_t;
846 pool_program_safe_realloc_rpc (void *args)
848 vlib_main_t *vm = vlib_get_main ();
849 u32 free_elts, max_elts, n_alloc;
850 pool_realloc_rpc_args_t *pra;
852 ASSERT (vlib_get_thread_index () == 0);
853 pra = (pool_realloc_rpc_args_t *) args;
855 vlib_worker_thread_barrier_sync (vm);
857 free_elts = _pool_free_elts (*pra->pool, pra->elt_size);
858 if (free_elts < POOL_REALLOC_SAFE_ELT_THRESH)
860 max_elts = _vec_max_len (*pra->pool, pra->elt_size);
861 n_alloc = clib_max (2 * max_elts, POOL_REALLOC_SAFE_ELT_THRESH);
862 _pool_alloc (pra->pool, n_alloc, pra->align, 0, pra->elt_size);
864 pool_realloc_flag (*pra->pool) = 0;
865 clib_mem_free (args);
867 vlib_worker_thread_barrier_release (vm);
871 pool_program_safe_realloc (void **p, u32 elt_size, u32 align)
873 pool_realloc_rpc_args_t *pra;
875 /* Reuse pad as a realloc flag */
876 if (pool_realloc_flag (*p))
879 pra = clib_mem_alloc (sizeof (*pra));
881 pra->elt_size = elt_size;
883 pool_realloc_flag (*p) = 1;
885 session_send_rpc_evt_to_thread (0 /* thread index */,
886 pool_program_safe_realloc_rpc, pra);
889 #define pool_needs_realloc(P) \
891 (vec_len (pool_header (P)->free_indices) < POOL_REALLOC_SAFE_ELT_THRESH && \
892 pool_free_elts (P) < POOL_REALLOC_SAFE_ELT_THRESH))
894 #define pool_get_aligned_safe(P, E, align) \
897 if (PREDICT_FALSE (pool_needs_realloc (P))) \
899 if (PREDICT_FALSE (!(P))) \
901 pool_alloc_aligned (P, POOL_REALLOC_SAFE_ELT_THRESH, align); \
903 else if (PREDICT_FALSE (!pool_free_elts (P))) \
905 vlib_workers_sync (); \
906 pool_alloc_aligned (P, pool_max_len (P), align); \
907 vlib_workers_continue (); \
908 ALWAYS_ASSERT (pool_free_elts (P) > 0); \
912 pool_program_safe_realloc ((void **) &(P), sizeof ((P)[0]), \
913 _vec_align (P, align)); \
916 pool_get_aligned (P, E, align); \
920 #endif /* __included_session_h__ */
923 * fd.io coding-style-patch-verification: ON
926 * eval: (c-set-style "gnu")