2 * Copyright (c) 2015 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_vlib_threads_h
16 #define included_vlib_threads_h
18 #include <vlib/main.h>
19 #include <linux/sched.h>
21 extern vlib_main_t **vlib_mains;
23 void vlib_set_thread_name (char *name);
25 /* arg is actually a vlib__thread_t * */
26 typedef void (vlib_thread_function_t) (void *arg);
28 typedef struct vlib_thread_registration_
30 /* constructor generated list of thread registrations */
31 struct vlib_thread_registration_ *next;
33 /* config parameters */
36 vlib_thread_function_t *function;
40 int no_data_structure_clone;
41 u32 frame_queue_nelts;
43 /* All threads of this type run on pthreads */
47 } vlib_thread_registration_t;
50 * Frames have their cpu / vlib_main_t index in the low-order N bits
51 * Make VLIB_MAX_CPUS a power-of-two, please...
55 #define VLIB_MAX_CPUS 256
58 #if VLIB_MAX_CPUS > CLIB_MAX_MHEAPS
59 #error Please increase number of per-cpu mheaps
62 #define VLIB_CPU_MASK (VLIB_MAX_CPUS - 1) /* 0x3f, max */
63 #define VLIB_OFFSET_MASK (~VLIB_CPU_MASK)
65 #define VLIB_LOG2_THREAD_STACK_SIZE (21)
66 #define VLIB_THREAD_STACK_SIZE (1<<VLIB_LOG2_THREAD_STACK_SIZE)
70 VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME,
71 } vlib_frame_queue_msg_type_t;
75 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
81 /* 256 * 4 = 1024 bytes, even mult of cache line size */
82 u32 buffer_index[VLIB_FRAME_SIZE];
84 vlib_frame_queue_elt_t;
88 /* First cache line */
89 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
90 volatile u32 *wait_at_barrier;
91 volatile u32 *workers_at_barrier;
93 /* Second Cache Line */
94 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
97 void (*thread_function) (void *);
98 void *thread_function_arg;
100 elog_track_t elog_track;
102 vlib_thread_registration_t *registration;
104 u64 barrier_sync_count;
105 u8 barrier_elog_enabled;
106 const char *barrier_caller;
107 const char *barrier_context;
108 volatile u32 *node_reforks_required;
115 } vlib_worker_thread_t;
117 extern vlib_worker_thread_t *vlib_worker_threads;
122 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
127 u32 enqueue_full_events;
130 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
136 u64 vector_threshold;
138 /* dequeue hint to enqueue side */
139 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
140 volatile u64 head_hint;
142 /* read-only, constant, shared */
143 CLIB_CACHE_LINE_ALIGN_MARK (cacheline3);
144 vlib_frame_queue_elt_t *elts;
151 vlib_frame_queue_elt_t **handoff_queue_elt_by_thread_index;
152 vlib_frame_queue_t **congested_handoff_queue_by_thread_index;
153 } vlib_frame_queue_per_thread_data_t;
158 u32 frame_queue_nelts;
161 vlib_frame_queue_t **vlib_frame_queues;
162 vlib_frame_queue_per_thread_data_t *per_thread_data;
164 /* for frame queue tracing */
165 frame_queue_trace_t *frame_queue_traces;
166 frame_queue_nelt_counter_t *frame_queue_histogram;
167 } vlib_frame_queue_main_t;
174 } vlib_process_signal_event_mt_args_t;
176 /* Called early, in thread 0's context */
177 clib_error_t *vlib_thread_init (vlib_main_t * vm);
179 int vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
180 u32 frame_queue_index, vlib_frame_t * frame,
181 vlib_frame_queue_msg_type_t type);
184 vlib_frame_queue_dequeue (vlib_main_t * vm, vlib_frame_queue_main_t * fqm);
186 void vlib_worker_thread_node_runtime_update (void);
188 void vlib_create_worker_threads (vlib_main_t * vm, int n,
189 void (*thread_function) (void *));
191 void vlib_worker_thread_init (vlib_worker_thread_t * w);
192 u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);
194 /* Check for a barrier sync request every 30ms */
195 #define BARRIER_SYNC_DELAY (0.030000)
198 /* long barrier timeout, for gdb... */
199 #define BARRIER_SYNC_TIMEOUT (600.1)
201 #define BARRIER_SYNC_TIMEOUT (1.0)
204 #define vlib_worker_thread_barrier_sync(X) {vlib_worker_thread_barrier_sync_int(X, __FUNCTION__);}
206 void vlib_worker_thread_barrier_sync_int (vlib_main_t * vm,
207 const char *func_name);
208 void vlib_worker_thread_barrier_release (vlib_main_t * vm);
209 u8 vlib_worker_thread_barrier_held (void);
210 void vlib_worker_thread_initial_barrier_sync_and_release (vlib_main_t * vm);
211 void vlib_worker_thread_node_refork (void);
213 * Wait until each of the workers has been once around the track
215 void vlib_worker_wait_one_loop (void);
217 static_always_inline uword
218 vlib_get_thread_index (void)
220 return __os_thread_index;
224 vlib_smp_unsafe_warning (void)
228 if (vlib_get_thread_index ())
229 fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
235 VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
236 VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
239 void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);
241 #define foreach_vlib_main(body) \
243 vlib_main_t ** __vlib_mains = 0, *this_vlib_main; \
246 for (ii = 0; ii < vec_len (vlib_mains); ii++) \
248 this_vlib_main = vlib_mains[ii]; \
250 this_vlib_main->parked_at_barrier == 1); \
251 if (this_vlib_main) \
252 vec_add1 (__vlib_mains, this_vlib_main); \
255 for (ii = 0; ii < vec_len (__vlib_mains); ii++) \
257 this_vlib_main = __vlib_mains[ii]; \
258 /* body uses this_vlib_main... */ \
261 vec_free (__vlib_mains); \
264 #define foreach_sched_policy \
265 _(SCHED_OTHER, OTHER, "other") \
266 _(SCHED_BATCH, BATCH, "batch") \
267 _(SCHED_IDLE, IDLE, "idle") \
268 _(SCHED_FIFO, FIFO, "fifo") \
269 _(SCHED_RR, RR, "rr")
273 #define _(v,f,s) SCHED_POLICY_##f = v,
281 clib_error_t *(*vlib_launch_thread_cb) (void *fp, vlib_worker_thread_t * w,
283 clib_error_t *(*vlib_thread_set_lcore_cb) (u32 thread, u16 cpu);
284 } vlib_thread_callbacks_t;
288 /* Link list of registrations, built by constructors */
289 vlib_thread_registration_t *next;
291 /* Vector of registrations, w/ non-data-structure clones at the top */
292 vlib_thread_registration_t **registrations;
294 uword *thread_registrations_by_name;
296 vlib_worker_thread_t *worker_threads;
299 * Launch all threads as pthreads,
300 * not eal_rte_launch (strict affinity) threads
304 /* Number of vlib_main / vnet_main clones */
307 /* Number of thread stacks to create */
310 /* Number of pthreads */
313 /* Number of threads */
316 /* Number of cores to skip, must match the core mask */
319 /* Thread prefix name */
322 /* main thread lcore */
325 /* Bitmap of available CPU cores */
326 uword *cpu_core_bitmap;
328 /* Bitmap of available CPU sockets (NUMA nodes) */
329 uword *cpu_socket_bitmap;
331 /* Worker handoff queues */
332 vlib_frame_queue_main_t *frame_queue_mains;
334 /* worker thread initialization barrier */
335 volatile u32 worker_thread_release;
337 /* scheduling policy */
340 /* scheduling policy priority */
344 vlib_thread_callbacks_t cb;
345 int extern_thread_mgmt;
346 } vlib_thread_main_t;
348 extern vlib_thread_main_t vlib_thread_main;
350 #include <vlib/global_funcs.h>
352 #define VLIB_REGISTER_THREAD(x,...) \
353 __VA_ARGS__ vlib_thread_registration_t x; \
354 static void __vlib_add_thread_registration_##x (void) \
355 __attribute__((__constructor__)) ; \
356 static void __vlib_add_thread_registration_##x (void) \
358 vlib_thread_main_t * tm = &vlib_thread_main; \
362 static void __vlib_rm_thread_registration_##x (void) \
363 __attribute__((__destructor__)) ; \
364 static void __vlib_rm_thread_registration_##x (void) \
366 vlib_thread_main_t * tm = &vlib_thread_main; \
367 VLIB_REMOVE_FROM_LINKED_LIST (tm->next, &x, next); \
369 __VA_ARGS__ vlib_thread_registration_t x
374 return vlib_thread_main.n_vlib_mains - 1;
378 vlib_get_worker_thread_index (u32 worker_index)
380 return worker_index + 1;
384 vlib_get_worker_index (u32 thread_index)
386 return thread_index - 1;
390 vlib_get_current_worker_index ()
392 return vlib_get_thread_index () - 1;
396 vlib_worker_thread_barrier_check (void)
398 if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
400 vlib_main_t *vm = vlib_get_main ();
401 u32 thread_index = vm->thread_index;
402 f64 t = vlib_time_now (vm);
404 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
406 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
408 ELOG_TYPE_DECLARE (e) = {
409 .format = "barrier-wait-thread-%d",
419 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
421 ed->thread_index = thread_index;
426 vm = vlib_get_main ();
427 vm->parked_at_barrier = 1;
429 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, 1);
430 while (*vlib_worker_threads->wait_at_barrier)
434 * Recompute the offset from thread-0 time.
435 * Note that vlib_time_now adds vm->time_offset, so
436 * clear it first. Save the resulting idea of "now", to
437 * see how well we're doing. See show_clock_command_fn(...)
441 vm->time_offset = 0.0;
442 now = vlib_time_now (vm);
443 vm->time_offset = vlib_global_main.time_last_barrier_release - now;
444 vm->time_last_barrier_release = vlib_time_now (vm);
448 vm->parked_at_barrier = 0;
449 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, -1);
451 if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
453 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
455 t = vlib_time_now (vm) - t;
456 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
458 ELOG_TYPE_DECLARE (e) = {
459 .format = "barrier-refork-thread-%d",
469 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
471 ed->thread_index = thread_index;
474 vlib_worker_thread_node_refork ();
475 clib_atomic_fetch_add (vlib_worker_threads->node_reforks_required,
477 while (*vlib_worker_threads->node_reforks_required)
480 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
482 t = vlib_time_now (vm) - t;
483 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
485 ELOG_TYPE_DECLARE (e) = {
486 .format = "barrier-released-thread-%d: %dus",
487 .format_args = "i4i4",
497 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
499 ed->thread_index = thread_index;
500 ed->duration = (int) (1000000.0 * t);
505 always_inline vlib_main_t *
506 vlib_get_worker_vlib_main (u32 worker_index)
509 vlib_thread_main_t *tm = &vlib_thread_main;
510 ASSERT (worker_index < tm->n_vlib_mains - 1);
511 vm = vlib_mains[worker_index + 1];
517 vlib_thread_is_main_w_barrier (void)
519 return (!vlib_num_workers ()
520 || ((vlib_get_thread_index () == 0
521 && vlib_worker_threads->wait_at_barrier[0])));
525 vlib_put_frame_queue_elt (vlib_frame_queue_elt_t * hf)
527 CLIB_MEMORY_BARRIER ();
531 static inline vlib_frame_queue_elt_t *
532 vlib_get_frame_queue_elt (u32 frame_queue_index, u32 index)
534 vlib_frame_queue_t *fq;
535 vlib_frame_queue_elt_t *elt;
536 vlib_thread_main_t *tm = &vlib_thread_main;
537 vlib_frame_queue_main_t *fqm =
538 vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
541 fq = fqm->vlib_frame_queues[index];
544 new_tail = clib_atomic_add_fetch (&fq->tail, 1);
546 /* Wait until a ring slot is available */
547 while (new_tail >= fq->head_hint + fq->nelts)
548 vlib_worker_thread_barrier_check ();
550 elt = fq->elts + (new_tail & (fq->nelts - 1));
552 /* this would be very bad... */
556 elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
557 elt->last_n_vectors = elt->n_vectors = 0;
562 static inline vlib_frame_queue_t *
563 is_vlib_frame_queue_congested (u32 frame_queue_index,
566 vlib_frame_queue_t **
567 handoff_queue_by_worker_index)
569 vlib_frame_queue_t *fq;
570 vlib_thread_main_t *tm = &vlib_thread_main;
571 vlib_frame_queue_main_t *fqm =
572 vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
574 fq = handoff_queue_by_worker_index[index];
575 if (fq != (vlib_frame_queue_t *) (~0))
578 fq = fqm->vlib_frame_queues[index];
581 if (PREDICT_FALSE (fq->tail >= (fq->head_hint + queue_hi_thresh)))
583 /* a valid entry in the array will indicate the queue has reached
584 * the specified threshold and is congested
586 handoff_queue_by_worker_index[index] = fq;
587 fq->enqueue_full_events++;
594 static inline vlib_frame_queue_elt_t *
595 vlib_get_worker_handoff_queue_elt (u32 frame_queue_index,
596 u32 vlib_worker_index,
597 vlib_frame_queue_elt_t **
598 handoff_queue_elt_by_worker_index)
600 vlib_frame_queue_elt_t *elt;
602 if (handoff_queue_elt_by_worker_index[vlib_worker_index])
603 return handoff_queue_elt_by_worker_index[vlib_worker_index];
605 elt = vlib_get_frame_queue_elt (frame_queue_index, vlib_worker_index);
607 handoff_queue_elt_by_worker_index[vlib_worker_index] = elt;
612 u8 *vlib_thread_stack_init (uword thread_index);
613 int vlib_thread_cb_register (struct vlib_main_t *vm,
614 vlib_thread_callbacks_t * cb);
615 extern void *rpc_call_main_thread_cb_fn;
618 vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
620 void vlib_rpc_call_main_thread (void *function, u8 * args, u32 size);
621 #endif /* included_vlib_threads_h */
624 * fd.io coding-style-patch-verification: ON
627 * eval: (c-set-style "gnu")