2 * Copyright (c) 2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (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.
16 #include <vcl/vcl_locked.h>
17 #include <vcl/vcl_private.h>
19 typedef struct vls_shared_data_
23 u32 *workers_subscribed;
24 clib_bitmap_t *listeners;
27 typedef struct vcl_locked_session_
33 u32 shared_data_index;
34 /** VCL session owned by different workers because of migration */
35 u32 owner_vcl_wrk_index;
36 uword *vcl_wrk_index_to_session_index;
37 } vcl_locked_session_t;
39 typedef struct vls_worker_
41 vcl_locked_session_t *vls_pool;
42 uword *session_handle_to_vlsh_table;
46 typedef struct vls_local_
49 volatile int vls_mt_n_threads;
50 pthread_mutex_t vls_mt_mq_mlock;
51 pthread_mutex_t vls_mt_spool_mlock;
52 volatile u8 select_mp_check;
53 volatile u8 epoll_mp_check;
54 } vls_process_local_t;
56 static vls_process_local_t vls_local;
57 static vls_process_local_t *vlsl = &vls_local;
59 typedef struct vls_main_
61 vls_worker_t *workers;
62 clib_rwlock_t vls_table_lock;
63 /** Pool of data shared by sessions owned by different workers */
64 vls_shared_data_t *shared_data_pool;
65 clib_rwlock_t shared_data_lock;
66 /** Lock to protect rpc among workers */
67 clib_spinlock_t worker_rpc_lock;
75 VLS_RPC_STATE_SUCCESS,
76 VLS_RPC_STATE_SESSION_NOT_EXIST,
79 typedef enum vls_rpc_msg_type_
81 VLS_RPC_CLONE_AND_SHARE,
85 typedef struct vls_rpc_msg_
91 typedef struct vls_clone_and_share_msg_
93 u32 vls_index; /**< vls to be shared */
94 u32 session_index; /**< vcl session to be shared */
95 u32 origin_vls_wrk; /**< vls worker that initiated the rpc */
96 u32 origin_vls_index; /**< vls session of the originator */
97 u32 origin_vcl_wrk; /**< vcl worker that initiated the rpc */
98 u32 origin_session_index; /**< vcl session of the originator */
99 } vls_clone_and_share_msg_t;
101 typedef struct vls_sess_cleanup_msg_
103 u32 session_index; /**< vcl session to be cleaned */
104 u32 origin_vcl_wrk; /**< worker that initiated the rpc */
105 } vls_sess_cleanup_msg_t;
107 void vls_send_session_cleanup_rpc (vcl_worker_t * wrk,
108 u32 dst_wrk_index, u32 dst_session_index);
109 void vls_send_clone_and_share_rpc (vcl_worker_t *wrk, u32 origin_vls_index,
110 u32 session_index, u32 vls_wrk_index,
111 u32 dst_wrk_index, u32 dst_vls_index,
112 u32 dst_session_index);
115 vls_get_worker_index (void)
117 if (vls_mt_wrk_supported ())
118 return vlsl->vls_wrk_index;
120 return vcl_get_worker_index ();
124 vls_shared_data_alloc (void)
126 vls_shared_data_t *vls_shd;
129 clib_rwlock_writer_lock (&vlsm->shared_data_lock);
130 pool_get_zero (vlsm->shared_data_pool, vls_shd);
131 clib_spinlock_init (&vls_shd->lock);
132 shd_index = vls_shd - vlsm->shared_data_pool;
133 clib_rwlock_writer_unlock (&vlsm->shared_data_lock);
139 vls_shared_data_index (vls_shared_data_t * vls_shd)
141 return vls_shd - vlsm->shared_data_pool;
145 vls_shared_data_get (u32 shd_index)
147 if (pool_is_free_index (vlsm->shared_data_pool, shd_index))
149 return pool_elt_at_index (vlsm->shared_data_pool, shd_index);
153 vls_shared_data_free (u32 shd_index)
155 vls_shared_data_t *vls_shd;
157 clib_rwlock_writer_lock (&vlsm->shared_data_lock);
158 vls_shd = vls_shared_data_get (shd_index);
159 clib_spinlock_free (&vls_shd->lock);
160 clib_bitmap_free (vls_shd->listeners);
161 vec_free (vls_shd->workers_subscribed);
162 pool_put (vlsm->shared_data_pool, vls_shd);
163 clib_rwlock_writer_unlock (&vlsm->shared_data_lock);
167 vls_shared_data_pool_rlock (void)
169 clib_rwlock_reader_lock (&vlsm->shared_data_lock);
173 vls_shared_data_pool_runlock (void)
175 clib_rwlock_reader_unlock (&vlsm->shared_data_lock);
179 vls_mt_table_rlock (void)
181 if (vlsl->vls_mt_n_threads > 1)
182 clib_rwlock_reader_lock (&vlsm->vls_table_lock);
186 vls_mt_table_runlock (void)
188 if (vlsl->vls_mt_n_threads > 1)
189 clib_rwlock_reader_unlock (&vlsm->vls_table_lock);
193 vls_mt_table_wlock (void)
195 if (vlsl->vls_mt_n_threads > 1)
196 clib_rwlock_writer_lock (&vlsm->vls_table_lock);
200 vls_mt_table_wunlock (void)
202 if (vlsl->vls_mt_n_threads > 1)
203 clib_rwlock_writer_unlock (&vlsm->vls_table_lock);
216 VLS_MT_LOCK_MQ = 1 << 0,
217 VLS_MT_LOCK_SPOOL = 1 << 1
218 } vls_mt_lock_type_t;
223 vlsl->vls_mt_n_threads += 1;
225 /* If multi-thread workers are supported, for each new thread register a new
226 * vcl worker with vpp. Otherwise, all threads use the same vcl worker, so
227 * update the vcl worker's thread local worker index variable */
228 if (vls_mt_wrk_supported ())
230 if (vppcom_worker_register () != VPPCOM_OK)
231 VERR ("failed to register worker");
234 vcl_set_worker_index (vlsl->vls_wrk_index);
238 vls_mt_mq_lock (void)
240 pthread_mutex_lock (&vlsl->vls_mt_mq_mlock);
244 vls_mt_mq_unlock (void)
246 pthread_mutex_unlock (&vlsl->vls_mt_mq_mlock);
250 vls_mt_spool_lock (void)
252 pthread_mutex_lock (&vlsl->vls_mt_spool_mlock);
256 vls_mt_create_unlock (void)
258 pthread_mutex_unlock (&vlsl->vls_mt_spool_mlock);
262 vls_mt_locks_init (void)
264 pthread_mutex_init (&vlsl->vls_mt_mq_mlock, NULL);
265 pthread_mutex_init (&vlsl->vls_mt_spool_mlock, NULL);
269 vls_is_shared (vcl_locked_session_t * vls)
271 return (vls->shared_data_index != ~0);
275 vls_lock (vcl_locked_session_t * vls)
277 if ((vlsl->vls_mt_n_threads > 1) || vls_is_shared (vls))
278 clib_spinlock_lock (&vls->lock);
282 vls_unlock (vcl_locked_session_t * vls)
284 if ((vlsl->vls_mt_n_threads > 1) || vls_is_shared (vls))
285 clib_spinlock_unlock (&vls->lock);
288 static inline vcl_session_handle_t
289 vls_to_sh (vcl_locked_session_t * vls)
291 return vcl_session_handle_from_index (vls->session_index);
294 static inline vcl_session_handle_t
295 vls_to_sh_tu (vcl_locked_session_t * vls)
297 vcl_session_handle_t sh;
298 sh = vls_to_sh (vls);
299 vls_mt_table_runlock ();
303 static vls_worker_t *
304 vls_worker_get_current (void)
306 return pool_elt_at_index (vlsm->workers, vls_get_worker_index ());
310 vls_worker_alloc (void)
314 pool_get_zero (vlsm->workers, wrk);
315 wrk->wrk_index = vcl_get_worker_index ();
319 vls_worker_free (vls_worker_t * wrk)
321 hash_free (wrk->session_handle_to_vlsh_table);
322 pool_free (wrk->vls_pool);
323 pool_put (vlsm->workers, wrk);
326 static vls_worker_t *
327 vls_worker_get (u32 wrk_index)
329 if (pool_is_free_index (vlsm->workers, wrk_index))
331 return pool_elt_at_index (vlsm->workers, wrk_index);
335 vls_alloc (vcl_session_handle_t sh)
337 vls_worker_t *wrk = vls_worker_get_current ();
338 vcl_locked_session_t *vls;
340 vls_mt_table_wlock ();
342 pool_get_zero (wrk->vls_pool, vls);
343 vls->session_index = vppcom_session_index (sh);
344 vls->worker_index = vppcom_session_worker (sh);
345 vls->vls_index = vls - wrk->vls_pool;
346 vls->shared_data_index = ~0;
347 hash_set (wrk->session_handle_to_vlsh_table, sh, vls->vls_index);
348 if (vls_mt_wrk_supported ())
350 hash_set (vls->vcl_wrk_index_to_session_index, vls->worker_index,
352 vls->owner_vcl_wrk_index = vls->worker_index;
354 clib_spinlock_init (&vls->lock);
356 vls_mt_table_wunlock ();
357 return vls->vls_index;
360 static vcl_locked_session_t *
361 vls_get (vls_handle_t vlsh)
363 vls_worker_t *wrk = vls_worker_get_current ();
364 if (pool_is_free_index (wrk->vls_pool, vlsh))
366 return pool_elt_at_index (wrk->vls_pool, vlsh);
370 vls_free (vcl_locked_session_t * vls)
372 vls_worker_t *wrk = vls_worker_get_current ();
375 hash_unset (wrk->session_handle_to_vlsh_table,
376 vcl_session_handle_from_index (vls->session_index));
377 clib_spinlock_free (&vls->lock);
378 pool_put (wrk->vls_pool, vls);
381 static vcl_locked_session_t *
382 vls_get_and_lock (vls_handle_t vlsh)
384 vls_worker_t *wrk = vls_worker_get_current ();
385 vcl_locked_session_t *vls;
386 if (pool_is_free_index (wrk->vls_pool, vlsh))
388 vls = pool_elt_at_index (wrk->vls_pool, vlsh);
393 static vcl_locked_session_t *
394 vls_get_w_dlock (vls_handle_t vlsh)
396 vcl_locked_session_t *vls;
397 vls_mt_table_rlock ();
398 vls = vls_get_and_lock (vlsh);
400 vls_mt_table_runlock ();
405 vls_get_and_unlock (vls_handle_t vlsh)
407 vcl_locked_session_t *vls;
408 vls_mt_table_rlock ();
409 vls = vls_get (vlsh);
411 vls_mt_table_runlock ();
415 vls_dunlock (vcl_locked_session_t * vls)
418 vls_mt_table_runlock ();
421 static vcl_locked_session_t *
422 vls_session_get (vls_worker_t * wrk, u32 vls_index)
424 if (pool_is_free_index (wrk->vls_pool, vls_index))
426 return pool_elt_at_index (wrk->vls_pool, vls_index);
430 vlsh_to_sh (vls_handle_t vlsh)
432 vcl_locked_session_t *vls;
435 vls = vls_get_w_dlock (vlsh);
437 return INVALID_SESSION_ID;
438 rv = vls_to_sh (vls);
444 vlsh_to_session_index (vls_handle_t vlsh)
446 vcl_session_handle_t sh;
447 sh = vlsh_to_sh (vlsh);
448 return vppcom_session_index (sh);
452 vls_si_wi_to_vlsh (u32 session_index, u32 vcl_wrk_index)
454 vls_worker_t *wrk = vls_worker_get_current ();
456 vlshp = hash_get (wrk->session_handle_to_vlsh_table,
457 vcl_session_handle_from_wrk_session_index (session_index,
459 return vlshp ? *vlshp : VLS_INVALID_HANDLE;
463 vls_session_index_to_vlsh (uint32_t session_index)
467 vls_mt_table_rlock ();
468 vlsh = vls_si_wi_to_vlsh (session_index, vcl_get_worker_index ());
469 vls_mt_table_runlock ();
475 vls_is_shared_by_wrk (vcl_locked_session_t * vls, u32 wrk_index)
477 vls_shared_data_t *vls_shd;
480 if (vls->shared_data_index == ~0)
483 vls_shared_data_pool_rlock ();
485 vls_shd = vls_shared_data_get (vls->shared_data_index);
486 clib_spinlock_lock (&vls_shd->lock);
488 for (i = 0; i < vec_len (vls_shd->workers_subscribed); i++)
489 if (vls_shd->workers_subscribed[i] == wrk_index)
491 clib_spinlock_unlock (&vls_shd->lock);
492 vls_shared_data_pool_runlock ();
495 clib_spinlock_unlock (&vls_shd->lock);
497 vls_shared_data_pool_runlock ();
502 vls_listener_wrk_set (vcl_locked_session_t * vls, u32 wrk_index, u8 is_active)
504 vls_shared_data_t *vls_shd;
506 if (vls->shared_data_index == ~0)
508 clib_warning ("not a shared session");
512 vls_shared_data_pool_rlock ();
514 vls_shd = vls_shared_data_get (vls->shared_data_index);
516 clib_spinlock_lock (&vls_shd->lock);
517 clib_bitmap_set (vls_shd->listeners, wrk_index, is_active);
518 clib_spinlock_unlock (&vls_shd->lock);
520 vls_shared_data_pool_runlock ();
524 vls_shared_get_owner (vcl_locked_session_t * vls)
526 vls_shared_data_t *vls_shd;
529 vls_shared_data_pool_rlock ();
531 vls_shd = vls_shared_data_get (vls->shared_data_index);
532 owner_wrk = vls_shd->owner_wrk_index;
534 vls_shared_data_pool_runlock ();
540 vls_listener_wrk_is_active (vcl_locked_session_t * vls, u32 wrk_index)
542 vls_shared_data_t *vls_shd;
545 if (vls->shared_data_index == ~0)
547 clib_warning ("not a shared session");
551 vls_shared_data_pool_rlock ();
553 vls_shd = vls_shared_data_get (vls->shared_data_index);
555 clib_spinlock_lock (&vls_shd->lock);
556 is_set = clib_bitmap_get (vls_shd->listeners, wrk_index);
557 clib_spinlock_unlock (&vls_shd->lock);
559 vls_shared_data_pool_runlock ();
561 return (is_set == 1);
565 vls_listener_wrk_start_listen (vcl_locked_session_t * vls, u32 wrk_index)
567 vppcom_session_listen (vls_to_sh (vls), ~0);
568 vls_listener_wrk_set (vls, wrk_index, 1 /* is_active */ );
572 vls_listener_wrk_stop_listen (vcl_locked_session_t * vls, u32 wrk_index)
577 wrk = vcl_worker_get (wrk_index);
578 s = vcl_session_get (wrk, vls->session_index);
579 if (s->session_state != VCL_STATE_LISTEN)
581 vcl_send_session_unlisten (wrk, s);
582 s->session_state = VCL_STATE_LISTEN_NO_MQ;
583 vls_listener_wrk_set (vls, wrk_index, 0 /* is_active */ );
587 vls_shared_data_subscriber_position (vls_shared_data_t * vls_shd,
592 for (i = 0; i < vec_len (vls_shd->workers_subscribed); i++)
594 if (vls_shd->workers_subscribed[i] == wrk_index)
601 vls_unshare_session (vcl_locked_session_t * vls, vcl_worker_t * wrk)
603 vls_shared_data_t *vls_shd;
604 int do_disconnect, pos;
608 if (vls->shared_data_index == ~0)
611 s = vcl_session_get (wrk, vls->session_index);
612 if (s->session_state == VCL_STATE_LISTEN)
613 vls_listener_wrk_set (vls, wrk->wrk_index, 0 /* is_active */ );
615 vls_shared_data_pool_rlock ();
617 vls_shd = vls_shared_data_get (vls->shared_data_index);
618 clib_spinlock_lock (&vls_shd->lock);
620 pos = vls_shared_data_subscriber_position (vls_shd, wrk->wrk_index);
623 clib_warning ("worker %u not subscribed for vls %u", wrk->wrk_index,
629 * Unsubscribe from share data and fifos
633 svm_fifo_del_subscriber (s->rx_fifo, wrk->vpp_wrk_index);
634 svm_fifo_del_subscriber (s->tx_fifo, wrk->vpp_wrk_index);
636 vec_del1 (vls_shd->workers_subscribed, pos);
641 n_subscribers = vec_len (vls_shd->workers_subscribed);
642 do_disconnect = s->session_state == VCL_STATE_LISTEN || !n_subscribers;
643 vcl_session_cleanup (wrk, s, vcl_session_handle (s), do_disconnect);
646 * No subscriber left, cleanup shared data
650 u32 shd_index = vls_shared_data_index (vls_shd);
652 clib_spinlock_unlock (&vls_shd->lock);
653 vls_shared_data_pool_runlock ();
655 vls_shared_data_free (shd_index);
657 /* All locks have been dropped */
661 /* Return, if this is not the owning worker */
662 if (vls_shd->owner_wrk_index != wrk->wrk_index)
665 ASSERT (vec_len (vls_shd->workers_subscribed));
668 * Check if we can change owner or close
670 vls_shd->owner_wrk_index = vls_shd->workers_subscribed[0];
671 vcl_send_session_worker_update (wrk, s, vls_shd->owner_wrk_index);
673 /* XXX is this still needed? */
674 if (vec_len (vls_shd->workers_subscribed) > 1)
675 clib_warning ("more workers need to be updated");
679 clib_spinlock_unlock (&vls_shd->lock);
680 vls_shared_data_pool_runlock ();
686 vls_init_share_session (vls_worker_t * vls_wrk, vcl_locked_session_t * vls)
688 vls_shared_data_t *vls_shd;
690 u32 vls_shd_index = vls_shared_data_alloc ();
692 vls_shared_data_pool_rlock ();
694 vls_shd = vls_shared_data_get (vls_shd_index);
695 vls_shd->owner_wrk_index = vls_wrk->wrk_index;
696 vls->shared_data_index = vls_shd_index;
697 vec_add1 (vls_shd->workers_subscribed, vls_wrk->wrk_index);
699 vls_shared_data_pool_runlock ();
703 vls_share_session (vls_worker_t * vls_wrk, vcl_locked_session_t * vls)
705 vcl_worker_t *vcl_wrk = vcl_worker_get (vls_wrk->wrk_index);
706 vls_shared_data_t *vls_shd;
709 s = vcl_session_get (vcl_wrk, vls->session_index);
712 clib_warning ("wrk %u session %u vls %u NOT AVAILABLE",
713 vcl_wrk->wrk_index, vls->session_index, vls->vls_index);
717 ASSERT (vls->shared_data_index != ~0);
719 /* Reinit session lock */
720 clib_spinlock_init (&vls->lock);
722 vls_shared_data_pool_rlock ();
724 vls_shd = vls_shared_data_get (vls->shared_data_index);
726 clib_spinlock_lock (&vls_shd->lock);
727 vec_add1 (vls_shd->workers_subscribed, vls_wrk->wrk_index);
728 clib_spinlock_unlock (&vls_shd->lock);
730 vls_shared_data_pool_runlock ();
734 svm_fifo_add_subscriber (s->rx_fifo, vcl_wrk->vpp_wrk_index);
735 svm_fifo_add_subscriber (s->tx_fifo, vcl_wrk->vpp_wrk_index);
737 else if (s->session_state == VCL_STATE_LISTEN)
739 s->session_state = VCL_STATE_LISTEN_NO_MQ;
744 vls_share_sessions (vls_worker_t * vls_parent_wrk, vls_worker_t * vls_wrk)
746 vcl_locked_session_t *vls, *parent_vls;
749 pool_foreach (vls, vls_wrk->vls_pool) {
750 /* Initialize sharing on parent session */
751 if (vls->shared_data_index == ~0)
753 parent_vls = vls_session_get (vls_parent_wrk, vls->vls_index);
754 vls_init_share_session (vls_parent_wrk, parent_vls);
755 vls->shared_data_index = parent_vls->shared_data_index;
757 vls_share_session (vls_wrk, vls);
763 vls_worker_copy_on_fork (vcl_worker_t * parent_wrk)
765 vls_worker_t *vls_wrk = vls_worker_get_current (), *vls_parent_wrk;
766 vcl_worker_t *wrk = vcl_worker_get_current ();
767 u32 vls_index, session_index, wrk_index;
768 vcl_session_handle_t sh;
773 wrk->sessions = pool_dup (parent_wrk->sessions);
774 wrk->session_index_by_vpp_handles =
775 hash_dup (parent_wrk->session_index_by_vpp_handles);
780 vls_parent_wrk = vls_worker_get (parent_wrk->wrk_index);
782 hash_foreach (sh, vls_index, vls_parent_wrk->session_handle_to_vlsh_table,
784 vcl_session_handle_parse (sh, &wrk_index, &session_index);
785 hash_set (vls_wrk->session_handle_to_vlsh_table,
786 vcl_session_handle_from_index (session_index), vls_index);
789 vls_wrk->vls_pool = pool_dup (vls_parent_wrk->vls_pool);
791 vls_share_sessions (vls_parent_wrk, vls_wrk);
795 vls_mt_acq_locks (vcl_locked_session_t * vls, vls_mt_ops_t op, int *locks_acq)
797 vcl_worker_t *wrk = vcl_worker_get_current ();
798 vcl_session_t *s = 0;
803 s = vcl_session_get (wrk, vls->session_index);
804 if (PREDICT_FALSE (!s))
806 is_nonblk = vcl_session_has_attr (s, VCL_SESS_ATTR_NONBLOCK);
813 is_nonblk = vcl_session_read_ready (s) != 0;
817 *locks_acq |= VLS_MT_LOCK_MQ;
820 case VLS_MT_OP_WRITE:
823 is_nonblk = vcl_session_write_ready (s) != 0;
827 *locks_acq |= VLS_MT_LOCK_MQ;
830 case VLS_MT_OP_XPOLL:
832 *locks_acq |= VLS_MT_LOCK_MQ;
834 case VLS_MT_OP_SPOOL:
835 vls_mt_spool_lock ();
836 *locks_acq |= VLS_MT_LOCK_SPOOL;
844 vls_mt_rel_locks (int locks_acq)
846 if (locks_acq & VLS_MT_LOCK_MQ)
848 if (locks_acq & VLS_MT_LOCK_SPOOL)
849 vls_mt_create_unlock ();
853 vls_mt_session_should_migrate (vcl_locked_session_t * vls)
855 return (vls_mt_wrk_supported ()
856 && vls->worker_index != vcl_get_worker_index ());
859 static vcl_locked_session_t *
860 vls_mt_session_migrate (vcl_locked_session_t *vls)
862 u32 wrk_index = vcl_get_worker_index ();
864 u32 src_sid, sid, vls_index, own_vcl_wrk_index;
865 vcl_session_t *session;
868 ASSERT (vls_mt_wrk_supported () && vls->worker_index != wrk_index);
871 * VCL session on current vcl worker already allocated. Update current
872 * owner worker and index and return
874 if ((p = hash_get (vls->vcl_wrk_index_to_session_index, wrk_index)))
876 vls->worker_index = wrk_index;
877 vls->session_index = (u32) p[0];
882 * Ask vcl worker that owns the original vcl session to clone it into
883 * current vcl worker session pool
886 if (!(p = hash_get (vls->vcl_wrk_index_to_session_index,
887 vls->owner_vcl_wrk_index)))
889 VERR ("session in owner worker(%u) is free", vls->owner_vcl_wrk_index);
892 vls_mt_table_runlock ();
896 src_sid = (u32) p[0];
897 wrk = vcl_worker_get_current ();
898 session = vcl_session_alloc (wrk);
899 sid = session->session_index;
900 VDBG (1, "migrate session of worker (session): %u (%u) -> %u (%u)",
901 vls->owner_vcl_wrk_index, src_sid, wrk_index, sid);
903 /* Drop lock to prevent dead lock when dst wrk trying to get lock. */
904 vls_index = vls->vls_index;
905 own_vcl_wrk_index = vls->owner_vcl_wrk_index;
907 vls_mt_table_runlock ();
908 vls_send_clone_and_share_rpc (wrk, vls_index, sid, vls_get_worker_index (),
909 own_vcl_wrk_index, vls_index, src_sid);
911 if (PREDICT_FALSE (wrk->rpc_done == VLS_RPC_STATE_SESSION_NOT_EXIST))
913 VWRN ("session %u not exist", src_sid);
916 else if (PREDICT_FALSE (wrk->rpc_done == VLS_RPC_STATE_INIT))
918 VWRN ("failed to wait rpc response");
921 else if (PREDICT_FALSE ((session->flags & VCL_SESSION_F_IS_VEP) &&
922 session->vep.next_sh != ~0))
924 VERR ("can't migrate nonempty epoll session");
928 else if (PREDICT_FALSE (!(session->flags & VCL_SESSION_F_IS_VEP) &&
929 session->session_state != VCL_STATE_CLOSED))
931 VERR ("migrate NOT supported, session_status (%u)",
932 session->session_state);
937 vls = vls_get_w_dlock (vls_index);
938 if (PREDICT_FALSE (!vls))
940 VWRN ("failed to get vls %u", vls_index);
944 session->session_index = sid;
945 vls->worker_index = wrk_index;
946 vls->session_index = sid;
947 hash_set (vls->vcl_wrk_index_to_session_index, wrk_index, sid);
951 vcl_session_free (wrk, session);
958 if (PREDICT_FALSE (vcl_get_worker_index () == ~0))
962 #define vls_mt_guard(_vls, _op) \
963 int _locks_acq = 0; \
964 if (vls_mt_wrk_supported ()) \
966 if (PREDICT_FALSE (_vls && \
967 ((vcl_locked_session_t *) _vls)->worker_index != \
968 vcl_get_worker_index ())) \
970 _vls = vls_mt_session_migrate (_vls); \
971 if (PREDICT_FALSE (!_vls)) \
972 return VPPCOM_EBADFD; \
977 if (PREDICT_FALSE (vlsl->vls_mt_n_threads > 1)) \
978 vls_mt_acq_locks (_vls, _op, &_locks_acq); \
981 #define vls_mt_unguard() \
982 if (PREDICT_FALSE (_locks_acq)) \
983 vls_mt_rel_locks (_locks_acq)
986 vls_write (vls_handle_t vlsh, void *buf, size_t nbytes)
988 vcl_locked_session_t *vls;
992 if (!(vls = vls_get_w_dlock (vlsh)))
993 return VPPCOM_EBADFD;
995 vls_mt_guard (vls, VLS_MT_OP_WRITE);
996 rv = vppcom_session_write (vls_to_sh_tu (vls), buf, nbytes);
998 vls_get_and_unlock (vlsh);
1003 vls_write_msg (vls_handle_t vlsh, void *buf, size_t nbytes)
1005 vcl_locked_session_t *vls;
1009 if (!(vls = vls_get_w_dlock (vlsh)))
1010 return VPPCOM_EBADFD;
1011 vls_mt_guard (vls, VLS_MT_OP_WRITE);
1012 rv = vppcom_session_write_msg (vls_to_sh_tu (vls), buf, nbytes);
1014 vls_get_and_unlock (vlsh);
1019 vls_sendto (vls_handle_t vlsh, void *buf, int buflen, int flags,
1020 vppcom_endpt_t * ep)
1022 vcl_locked_session_t *vls;
1026 if (!(vls = vls_get_w_dlock (vlsh)))
1027 return VPPCOM_EBADFD;
1028 vls_mt_guard (vls, VLS_MT_OP_WRITE);
1029 rv = vppcom_session_sendto (vls_to_sh_tu (vls), buf, buflen, flags, ep);
1031 vls_get_and_unlock (vlsh);
1036 vls_read (vls_handle_t vlsh, void *buf, size_t nbytes)
1038 vcl_locked_session_t *vls;
1042 if (!(vls = vls_get_w_dlock (vlsh)))
1043 return VPPCOM_EBADFD;
1044 vls_mt_guard (vls, VLS_MT_OP_READ);
1045 rv = vppcom_session_read (vls_to_sh_tu (vls), buf, nbytes);
1047 vls_get_and_unlock (vlsh);
1052 vls_recvfrom (vls_handle_t vlsh, void *buffer, uint32_t buflen, int flags,
1053 vppcom_endpt_t * ep)
1055 vcl_locked_session_t *vls;
1059 if (!(vls = vls_get_w_dlock (vlsh)))
1060 return VPPCOM_EBADFD;
1061 vls_mt_guard (vls, VLS_MT_OP_READ);
1062 rv = vppcom_session_recvfrom (vls_to_sh_tu (vls), buffer, buflen, flags,
1065 vls_get_and_unlock (vlsh);
1070 vls_attr (vls_handle_t vlsh, uint32_t op, void *buffer, uint32_t * buflen)
1072 vcl_locked_session_t *vls;
1076 if (!(vls = vls_get_w_dlock (vlsh)))
1077 return VPPCOM_EBADFD;
1078 if (vls_mt_session_should_migrate (vls))
1080 vls = vls_mt_session_migrate (vls);
1081 if (PREDICT_FALSE (!vls))
1082 return VPPCOM_EBADFD;
1084 rv = vppcom_session_attr (vls_to_sh_tu (vls), op, buffer, buflen);
1085 vls_get_and_unlock (vlsh);
1090 vls_bind (vls_handle_t vlsh, vppcom_endpt_t * ep)
1092 vcl_locked_session_t *vls;
1096 if (!(vls = vls_get_w_dlock (vlsh)))
1097 return VPPCOM_EBADFD;
1098 rv = vppcom_session_bind (vls_to_sh_tu (vls), ep);
1099 vls_get_and_unlock (vlsh);
1104 vls_listen (vls_handle_t vlsh, int q_len)
1106 vcl_locked_session_t *vls;
1110 if (!(vls = vls_get_w_dlock (vlsh)))
1111 return VPPCOM_EBADFD;
1112 vls_mt_guard (vls, VLS_MT_OP_XPOLL);
1113 rv = vppcom_session_listen (vls_to_sh_tu (vls), q_len);
1115 vls_get_and_unlock (vlsh);
1120 vls_connect (vls_handle_t vlsh, vppcom_endpt_t * server_ep)
1122 vcl_locked_session_t *vls;
1126 if (!(vls = vls_get_w_dlock (vlsh)))
1127 return VPPCOM_EBADFD;
1128 vls_mt_guard (vls, VLS_MT_OP_XPOLL);
1129 rv = vppcom_session_connect (vls_to_sh_tu (vls), server_ep);
1131 vls_get_and_unlock (vlsh);
1136 vls_mp_checks (vcl_locked_session_t * vls, int is_add)
1138 vcl_worker_t *wrk = vcl_worker_get_current ();
1142 if (vls_mt_wrk_supported ())
1145 s = vcl_session_get (wrk, vls->session_index);
1146 switch (s->session_state)
1148 case VCL_STATE_LISTEN:
1151 vls_listener_wrk_set (vls, vls->worker_index, 1 /* is_active */ );
1154 vls_listener_wrk_stop_listen (vls, vls->worker_index);
1156 case VCL_STATE_LISTEN_NO_MQ:
1160 /* Register worker as listener */
1161 vls_listener_wrk_start_listen (vls, wrk->wrk_index);
1163 /* If owner worker did not attempt to accept/xpoll on the session,
1164 * force a listen stop for it, since it may not be interested in
1165 * accepting new sessions.
1166 * This is pretty much a hack done to give app workers the illusion
1167 * that it is fine to listen and not accept new sessions for a
1168 * given listener. Without it, we would accumulate unhandled
1169 * accepts on the passive worker message queue. */
1170 owner_wrk = vls_shared_get_owner (vls);
1171 if (!vls_listener_wrk_is_active (vls, owner_wrk))
1172 vls_listener_wrk_stop_listen (vls, owner_wrk);
1180 vls_accept (vls_handle_t listener_vlsh, vppcom_endpt_t * ep, int flags)
1182 vls_handle_t accepted_vlsh;
1183 vcl_locked_session_t *vls;
1187 if (!(vls = vls_get_w_dlock (listener_vlsh)))
1188 return VPPCOM_EBADFD;
1189 if (vcl_n_workers () > 1)
1190 vls_mp_checks (vls, 1 /* is_add */ );
1191 vls_mt_guard (vls, VLS_MT_OP_SPOOL);
1192 sh = vppcom_session_accept (vls_to_sh_tu (vls), ep, flags);
1194 vls_get_and_unlock (listener_vlsh);
1197 accepted_vlsh = vls_alloc (sh);
1198 if (PREDICT_FALSE (accepted_vlsh == VLS_INVALID_HANDLE))
1199 vppcom_session_close (sh);
1200 return accepted_vlsh;
1204 vls_create (uint8_t proto, uint8_t is_nonblocking)
1206 vcl_session_handle_t sh;
1208 vcl_locked_session_t *vls = NULL;
1211 vls_mt_guard (vls, VLS_MT_OP_SPOOL);
1212 sh = vppcom_session_create (proto, is_nonblocking);
1214 if (sh == INVALID_SESSION_ID)
1215 return VLS_INVALID_HANDLE;
1217 vlsh = vls_alloc (sh);
1218 if (PREDICT_FALSE (vlsh == VLS_INVALID_HANDLE))
1219 vppcom_session_close (sh);
1225 vls_mt_session_cleanup (vcl_locked_session_t * vls)
1227 u32 session_index, wrk_index, current_vcl_wrk;
1228 vcl_worker_t *wrk = vcl_worker_get_current ();
1230 ASSERT (vls_mt_wrk_supported ());
1232 current_vcl_wrk = vcl_get_worker_index ();
1235 hash_foreach (wrk_index, session_index, vls->vcl_wrk_index_to_session_index,
1237 if (current_vcl_wrk != wrk_index)
1238 vls_send_session_cleanup_rpc (wrk, wrk_index, session_index);
1241 hash_free (vls->vcl_wrk_index_to_session_index);
1245 vls_close (vls_handle_t vlsh)
1247 vcl_locked_session_t *vls;
1251 vls_mt_table_wlock ();
1253 vls = vls_get_and_lock (vlsh);
1256 vls_mt_table_wunlock ();
1257 return VPPCOM_EBADFD;
1260 vls_mt_guard (vls, VLS_MT_OP_SPOOL);
1262 if (vls_is_shared (vls))
1263 rv = vls_unshare_session (vls, vcl_worker_get_current ());
1265 rv = vppcom_session_close (vls_to_sh (vls));
1267 if (vls_mt_wrk_supported ())
1268 vls_mt_session_cleanup (vls);
1273 vls_mt_table_wunlock ();
1279 vls_epoll_create (void)
1281 vcl_session_handle_t sh;
1286 sh = vppcom_epoll_create ();
1287 if (sh == INVALID_SESSION_ID)
1288 return VLS_INVALID_HANDLE;
1290 vlsh = vls_alloc (sh);
1291 if (vlsh == VLS_INVALID_HANDLE)
1292 vppcom_session_close (sh);
1298 vls_epoll_ctl_mp_checks (vcl_locked_session_t * vls, int op)
1300 if (vcl_n_workers () <= 1)
1302 vlsl->epoll_mp_check = 1;
1306 if (op == EPOLL_CTL_MOD)
1309 vlsl->epoll_mp_check = 1;
1310 vls_mp_checks (vls, op == EPOLL_CTL_ADD);
1314 vls_epoll_ctl (vls_handle_t ep_vlsh, int op, vls_handle_t vlsh,
1315 struct epoll_event *event)
1317 vcl_locked_session_t *ep_vls, *vls;
1318 vcl_session_handle_t ep_sh, sh;
1322 vls_mt_table_rlock ();
1323 ep_vls = vls_get_and_lock (ep_vlsh);
1325 if (vls_mt_session_should_migrate (ep_vls))
1327 ep_vls = vls_mt_session_migrate (ep_vls);
1328 if (PREDICT_FALSE (!ep_vls))
1329 return VPPCOM_EBADFD;
1332 ep_sh = vls_to_sh (ep_vls);
1333 vls = vls_get_and_lock (vlsh);
1334 sh = vls_to_sh (vls);
1336 if (PREDICT_FALSE (!vlsl->epoll_mp_check))
1337 vls_epoll_ctl_mp_checks (vls, op);
1339 vls_mt_table_runlock ();
1341 rv = vppcom_epoll_ctl (ep_sh, op, sh, event);
1343 vls_mt_table_rlock ();
1344 ep_vls = vls_get (ep_vlsh);
1345 vls = vls_get (vlsh);
1347 vls_unlock (ep_vls);
1348 vls_mt_table_runlock ();
1353 vls_epoll_wait (vls_handle_t ep_vlsh, struct epoll_event *events,
1354 int maxevents, double wait_for_time)
1356 vcl_locked_session_t *vls, *vls_tmp = NULL;
1360 if (!(vls = vls_get_w_dlock (ep_vlsh)))
1361 return VPPCOM_EBADFD;
1362 vls_mt_guard (vls_tmp, VLS_MT_OP_XPOLL);
1363 rv = vppcom_epoll_wait (vls_to_sh_tu (vls), events, maxevents,
1366 vls_get_and_unlock (ep_vlsh);
1371 vls_select_mp_checks (vcl_si_set * read_map)
1373 vcl_locked_session_t *vls;
1378 if (vcl_n_workers () <= 1)
1380 vlsl->select_mp_check = 1;
1387 vlsl->select_mp_check = 1;
1388 wrk = vcl_worker_get_current ();
1391 clib_bitmap_foreach (si, read_map) {
1392 s = vcl_session_get (wrk, si);
1393 if (s->session_state == VCL_STATE_LISTEN)
1395 vls = vls_get (vls_session_index_to_vlsh (si));
1396 vls_mp_checks (vls, 1 /* is_add */);
1403 vls_select (int n_bits, vcl_si_set * read_map, vcl_si_set * write_map,
1404 vcl_si_set * except_map, double wait_for_time)
1407 vcl_locked_session_t *vls = NULL;
1410 vls_mt_guard (vls, VLS_MT_OP_XPOLL);
1411 if (PREDICT_FALSE (!vlsl->select_mp_check))
1412 vls_select_mp_checks (read_map);
1413 rv = vppcom_select (n_bits, read_map, write_map, except_map, wait_for_time);
1419 vls_unshare_vcl_worker_sessions (vcl_worker_t * wrk)
1421 u32 current_wrk, is_current;
1422 vcl_locked_session_t *vls;
1425 if (pool_elts (vcm->workers) <= 1)
1428 current_wrk = vcl_get_worker_index ();
1429 is_current = current_wrk == wrk->wrk_index;
1432 pool_foreach (s, wrk->sessions) {
1433 vls = vls_get (vls_si_wi_to_vlsh (s->session_index, wrk->wrk_index));
1434 if (vls && (is_current || vls_is_shared_by_wrk (vls, current_wrk)))
1435 vls_unshare_session (vls, wrk);
1441 vls_cleanup_vcl_worker (vcl_worker_t * wrk)
1443 vls_worker_t *vls_wrk = vls_worker_get (wrk->wrk_index);
1445 /* Unshare sessions and also cleanup worker since child may have
1446 * called _exit () and therefore vcl may not catch the event */
1447 vls_unshare_vcl_worker_sessions (wrk);
1448 vcl_worker_cleanup (wrk, 1 /* notify vpp */ );
1450 vls_worker_free (vls_wrk);
1454 vls_cleanup_forked_child (vcl_worker_t * wrk, vcl_worker_t * child_wrk)
1456 vcl_worker_t *sub_child;
1459 if (child_wrk->forked_child != ~0)
1461 sub_child = vcl_worker_get_if_valid (child_wrk->forked_child);
1464 /* Wait a bit, maybe the process is going away */
1465 while (kill (sub_child->current_pid, 0) >= 0 && tries++ < 50)
1467 if (kill (sub_child->current_pid, 0) < 0)
1468 vls_cleanup_forked_child (child_wrk, sub_child);
1471 vls_cleanup_vcl_worker (child_wrk);
1472 VDBG (0, "Cleaned up forked child wrk %u", child_wrk->wrk_index);
1473 wrk->forked_child = ~0;
1476 static struct sigaction old_sa;
1479 vls_intercept_sigchld_handler (int signum, siginfo_t * si, void *uc)
1481 vcl_worker_t *wrk, *child_wrk;
1483 if (vcl_get_worker_index () == ~0)
1486 if (sigaction (SIGCHLD, &old_sa, 0))
1488 VERR ("couldn't restore sigchld");
1492 wrk = vcl_worker_get_current ();
1493 if (wrk->forked_child == ~0)
1496 child_wrk = vcl_worker_get_if_valid (wrk->forked_child);
1500 if (si && si->si_pid != child_wrk->current_pid)
1502 VDBG (0, "unexpected child pid %u", si->si_pid);
1505 vls_cleanup_forked_child (wrk, child_wrk);
1508 if (old_sa.sa_flags & SA_SIGINFO)
1510 void (*fn) (int, siginfo_t *, void *) = old_sa.sa_sigaction;
1511 fn (signum, si, uc);
1515 void (*fn) (int) = old_sa.sa_handler;
1522 vls_incercept_sigchld ()
1524 struct sigaction sa;
1525 clib_memset (&sa, 0, sizeof (sa));
1526 sa.sa_sigaction = vls_intercept_sigchld_handler;
1527 sa.sa_flags = SA_SIGINFO;
1528 if (sigaction (SIGCHLD, &sa, &old_sa))
1530 VERR ("couldn't intercept sigchld");
1536 vls_app_pre_fork (void)
1538 vls_incercept_sigchld ();
1539 vcl_flush_mq_events ();
1543 vls_app_fork_child_handler (void)
1545 vcl_worker_t *parent_wrk;
1546 int parent_wrk_index;
1548 parent_wrk_index = vcl_get_worker_index ();
1549 VDBG (0, "initializing forked child %u with parent wrk %u", getpid (),
1555 vcl_set_worker_index (~0);
1558 * Allocate and register vcl worker with vpp
1560 if (vppcom_worker_register ())
1562 VERR ("couldn't register new worker!");
1567 * Allocate/initialize vls worker and share sessions
1569 vls_worker_alloc ();
1570 parent_wrk = vcl_worker_get (parent_wrk_index);
1571 vls_worker_copy_on_fork (parent_wrk);
1572 parent_wrk->forked_child = vcl_get_worker_index ();
1574 /* Reset number of threads and set wrk index */
1575 vlsl->vls_mt_n_threads = 0;
1576 vlsl->vls_wrk_index = vcl_get_worker_index ();
1577 vlsl->select_mp_check = 0;
1578 vlsl->epoll_mp_check = 0;
1579 vls_mt_locks_init ();
1581 VDBG (0, "forked child main worker initialized");
1586 vls_app_fork_parent_handler (void)
1589 while (vcm->forking)
1596 vls_worker_t *wrk = vls_worker_get_current ();
1598 /* Unshare the sessions. VCL will clean up the worker */
1599 vls_unshare_vcl_worker_sessions (vcl_worker_get_current ());
1600 vls_worker_free (wrk);
1604 vls_clone_and_share_rpc_handler (void *args)
1606 vls_clone_and_share_msg_t *msg = (vls_clone_and_share_msg_t *) args;
1607 vls_worker_t *wrk = vls_worker_get_current (), *dst_wrk;
1608 vcl_locked_session_t *vls, *dst_vls;
1609 vcl_worker_t *vcl_wrk = vcl_worker_get_current (), *dst_vcl_wrk;
1610 vcl_session_t *s, *dst_s;
1612 VDBG (1, "process session clone of worker (session): %u (%u) -> %u (%u)",
1613 vcl_wrk->wrk_index, msg->session_index, msg->origin_vcl_wrk,
1614 msg->origin_session_index);
1616 /* VCL locked session can't been protected, so DONT touch it.
1617 * VCL session may been free, check it.
1619 dst_vcl_wrk = vcl_worker_get (msg->origin_vcl_wrk);
1620 s = vcl_session_get (vcl_wrk, msg->session_index);
1621 if (PREDICT_FALSE (!s))
1623 dst_vcl_wrk->rpc_done = VLS_RPC_STATE_SESSION_NOT_EXIST;
1627 if (!vls_mt_wrk_supported ())
1629 vls = vls_session_get (wrk, msg->vls_index);
1630 vls_init_share_session (wrk, vls);
1631 dst_wrk = vls_worker_get (msg->origin_vls_wrk);
1632 dst_vls = vls_session_get (dst_wrk, msg->origin_vls_index);
1633 dst_vls->shared_data_index = vls->shared_data_index;
1635 dst_s = vcl_session_get (dst_vcl_wrk, msg->origin_session_index);
1636 clib_memcpy (dst_s, s, sizeof (*s));
1638 dst_vcl_wrk->rpc_done = VLS_RPC_STATE_SUCCESS;
1642 vls_session_cleanup_rpc_handler (void *args)
1644 vls_sess_cleanup_msg_t *msg = (vls_sess_cleanup_msg_t *) args;
1645 vcl_worker_t *wrk = vcl_worker_get_current ();
1646 vcl_session_handle_t sh = vcl_session_handle_from_index (msg->session_index);
1648 VDBG (1, "process session cleanup of worker (session): %u (%u) from %u ()",
1649 wrk->wrk_index, msg->session_index, msg->origin_vcl_wrk);
1651 vppcom_session_close (sh);
1655 vls_rpc_handler (void *args)
1657 vls_rpc_msg_t *msg = (vls_rpc_msg_t *) args;
1660 case VLS_RPC_CLONE_AND_SHARE:
1661 vls_clone_and_share_rpc_handler (msg->data);
1663 case VLS_RPC_SESS_CLEANUP:
1664 vls_session_cleanup_rpc_handler (msg->data);
1672 vls_send_clone_and_share_rpc (vcl_worker_t *wrk, u32 origin_vls_index,
1673 u32 session_index, u32 vls_wrk_index,
1674 u32 dst_wrk_index, u32 dst_vls_index,
1675 u32 dst_session_index)
1677 u8 data[sizeof (u8) + sizeof (vls_clone_and_share_msg_t)];
1678 vls_clone_and_share_msg_t *msg;
1681 f64 timeout = clib_time_now (&wrk->clib_time) + VLS_WORKER_RPC_TIMEOUT;
1683 rpc = (vls_rpc_msg_t *) & data;
1684 rpc->type = VLS_RPC_CLONE_AND_SHARE;
1685 msg = (vls_clone_and_share_msg_t *) & rpc->data;
1686 msg->origin_vls_wrk = vls_wrk_index;
1687 msg->origin_vls_index = origin_vls_index;
1688 msg->origin_vcl_wrk = wrk->wrk_index;
1689 msg->origin_session_index = session_index;
1690 msg->vls_index = dst_vls_index;
1691 msg->session_index = dst_session_index;
1693 /* Try lock and handle rpcs if two threads send each other
1694 * clone requests at the same time.
1696 wrk->rpc_done = VLS_RPC_STATE_INIT;
1697 while (!clib_spinlock_trylock (&vlsm->worker_rpc_lock))
1698 vcl_flush_mq_events ();
1699 ret = vcl_send_worker_rpc (dst_wrk_index, rpc, sizeof (data));
1701 VDBG (1, "send session clone to wrk (session): %u (%u) -> %u (%u), ret=%d",
1702 dst_wrk_index, msg->session_index, msg->origin_vcl_wrk,
1703 msg->origin_session_index, ret);
1704 while (!ret && wrk->rpc_done == VLS_RPC_STATE_INIT &&
1705 clib_time_now (&wrk->clib_time) < timeout)
1707 clib_spinlock_unlock (&vlsm->worker_rpc_lock);
1711 vls_send_session_cleanup_rpc (vcl_worker_t * wrk,
1712 u32 dst_wrk_index, u32 dst_session_index)
1714 u8 data[sizeof (u8) + sizeof (vls_sess_cleanup_msg_t)];
1715 vls_sess_cleanup_msg_t *msg;
1719 rpc = (vls_rpc_msg_t *) & data;
1720 rpc->type = VLS_RPC_SESS_CLEANUP;
1721 msg = (vls_sess_cleanup_msg_t *) & rpc->data;
1722 msg->origin_vcl_wrk = wrk->wrk_index;
1723 msg->session_index = dst_session_index;
1725 ret = vcl_send_worker_rpc (dst_wrk_index, rpc, sizeof (data));
1727 VDBG (1, "send session cleanup to wrk (session): %u (%u) from %u, ret=%d",
1728 dst_wrk_index, msg->session_index, msg->origin_vcl_wrk, ret);
1732 vls_app_create (char *app_name)
1736 if ((rv = vppcom_app_create (app_name)))
1739 vlsm = clib_mem_alloc (sizeof (vls_main_t));
1740 clib_memset (vlsm, 0, sizeof (*vlsm));
1741 clib_rwlock_init (&vlsm->vls_table_lock);
1742 clib_rwlock_init (&vlsm->shared_data_lock);
1743 clib_spinlock_init (&vlsm->worker_rpc_lock);
1744 pool_alloc (vlsm->workers, vcm->cfg.max_workers);
1746 pthread_atfork (vls_app_pre_fork, vls_app_fork_parent_handler,
1747 vls_app_fork_child_handler);
1748 atexit (vls_app_exit);
1749 vls_worker_alloc ();
1750 vlsl->vls_wrk_index = vcl_get_worker_index ();
1751 vls_mt_locks_init ();
1752 vcm->wrk_rpc_fn = vls_rpc_handler;
1757 vls_use_eventfd (void)
1759 return vcm->cfg.use_mq_eventfd;
1763 vls_mt_wrk_supported (void)
1765 return vcm->cfg.mt_wrk_supported;
1769 vls_use_real_epoll (void)
1771 if (vcl_get_worker_index () == ~0)
1774 return vcl_worker_get_current ()->vcl_needs_real_epoll;
1778 vls_register_vcl_worker (void)
1784 * fd.io coding-style-patch-verification: ON
1787 * eval: (c-set-style "gnu")