aboutsummaryrefslogtreecommitdiffstats
path: root/lib/librte_timer/rte_timer.c
blob: 18782fab0a7a6af2c22010b5c9be0d1f8d642347 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <assert.h>
#include <sys/queue.h>

#include <rte_atomic.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_per_lcore.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_spinlock.h>
#include <rte_random.h>

#include "rte_timer.h"

LIST_HEAD(rte_timer_list, rte_timer);

struct priv_timer {
	struct rte_timer pending_head;  /**< dummy timer instance to head up list */
	rte_spinlock_t list_lock;       /**< lock to protect list access */

	/** per-core variable that true if a timer was updated on this
	 *  core since last reset of the variable */
	int updated;

	/** track the current depth of the skiplist */
	unsigned curr_skiplist_depth;

	unsigned prev_lcore;              /**< used for lcore round robin */

	/** running timer on this lcore now */
	struct rte_timer *running_tim;

#ifdef RTE_LIBRTE_TIMER_DEBUG
	/** per-lcore statistics */
	struct rte_timer_debug_stats stats;
#endif
} __rte_cache_aligned;

/** per-lcore private info for timers */
static struct priv_timer priv_timer[RTE_MAX_LCORE];

/* when debug is enabled, store some statistics */
#ifdef RTE_LIBRTE_TIMER_DEBUG
#define __TIMER_STAT_ADD(name, n) do {					\
		unsigned __lcore_id = rte_lcore_id();			\
		if (__lcore_id < RTE_MAX_LCORE)				\
			priv_timer[__lcore_id].stats.name += (n);	\
	} while(0)
#else
#define __TIMER_STAT_ADD(name, n) do {} while(0)
#endif

/* Init the timer library. */
void
rte_timer_subsystem_init(void)
{
	unsigned lcore_id;

	/* since priv_timer is static, it's zeroed by default, so only init some
	 * fields.
	 */
	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id ++) {
		rte_spinlock_init(&priv_timer[lcore_id].list_lock);
		priv_timer[lcore_id].prev_lcore = lcore_id;
	}
}

/* Initialize the timer handle tim for use */
void
rte_timer_init(struct rte_timer *tim)
{
	union rte_timer_status status;

	status.state = RTE_TIMER_STOP;
	status.owner = RTE_TIMER_NO_OWNER;
	tim->status.u32 = status.u32;
}

/*
 * if timer is pending or stopped (or running on the same core than
 * us), mark timer as configuring, and on success return the previous
 * status of the timer
 */
static int
timer_set_config_state(struct rte_timer *tim,
		       union rte_timer_status *ret_prev_status)
{
	union rte_timer_status prev_status, status;
	int success = 0;
	unsigned lcore_id;

	lcore_id = rte_lcore_id();

	/* wait that the timer is in correct status before update,
	 * and mark it as being configured */
	while (success == 0) {
		prev_status.u32 = tim->status.u32;

		/* timer is running on another core
		 * or ready to run on local core, exit
		 */
		if (prev_status.state == RTE_TIMER_RUNNING &&
		    (prev_status.owner != (uint16_t)lcore_id ||
		     tim != priv_timer[lcore_id].running_tim))
			return -1;

		/* timer is being configured on another core */
		if (prev_status.state == RTE_TIMER_CONFIG)
			return -1;

		/* here, we know that timer is stopped or pending,
		 * mark it atomically as being configured */
		status.state = RTE_TIMER_CONFIG;
		status.owner = (int16_t)lcore_id;
		success = rte_atomic32_cmpset(&tim->status.u32,
					      prev_status.u32,
					      status.u32);
	}

	ret_prev_status->u32 = prev_status.u32;
	return 0;
}

/*
 * if timer is pending, mark timer as running
 */
static int
timer_set_running_state(struct rte_timer *tim)
{
	union rte_timer_status prev_status, status;
	unsigned lcore_id = rte_lcore_id();
	int success = 0;

	/* wait that the timer is in correct status before update,
	 * and mark it as running */
	while (success == 0) {
		prev_status.u32 = tim->status.u32;

		/* timer is not pending anymore */
		if (prev_status.state != RTE_TIMER_PENDING)
			return -1;

		/* here, we know that timer is stopped or pending,
		 * mark it atomically as beeing configured */
		status.state = RTE_TIMER_RUNNING;
		status.owner = (int16_t)lcore_id;
		success = rte_atomic32_cmpset(&tim->status.u32,
					      prev_status.u32,
					      status.u32);
	}

	return 0;
}

/*
 * Return a skiplist level for a new entry.
 * This probabalistically gives a level with p=1/4 that an entry at level n
 * will also appear at level n+1.
 */
static uint32_t
timer_get_skiplist_level(unsigned curr_depth)
{
#ifdef RTE_LIBRTE_TIMER_DEBUG
	static uint32_t i, count = 0;
	static uint32_t levels[MAX_SKIPLIST_DEPTH] = {0};
#endif

	/* probability value is 1/4, i.e. all at level 0, 1 in 4 is at level 1,
	 * 1 in 16 at level 2, 1 in 64 at level 3, etc. Calculated using lowest
	 * bit position of a (pseudo)random number.
	 */
	uint32_t rand = rte_rand() & (UINT32_MAX - 1);
	uint32_t level = rand == 0 ? MAX_SKIPLIST_DEPTH : (rte_bsf32(rand)-1) / 2;

	/* limit the levels used to one above our current level, so we don't,
	 * for instance, have a level 0 and a level 7 without anything between
	 */
	if (level > curr_depth)
		level = curr_depth;
	if (level >= MAX_SKIPLIST_DEPTH)
		level = MAX_SKIPLIST_DEPTH-1;
#ifdef RTE_LIBRTE_TIMER_DEBUG
	count ++;
	levels[level]++;
	if (count % 10000 == 0)
		for (i = 0; i < MAX_SKIPLIST_DEPTH; i++)
			printf("Level %u: %u\n", (unsigned)i, (unsigned)levels[i]);
#endif
	return level;
}

/*
 * For a given time value, get the entries at each level which
 * are <= that time value.
 */
static void
timer_get_prev_entries(uint64_t time_val, unsigned tim_lcore,
		struct rte_timer **prev)
{
	unsigned lvl = priv_timer[tim_lcore].curr_skiplist_depth;
	prev[lvl] = &priv_timer[tim_lcore].pending_head;
	while(lvl != 0) {
		lvl--;
		prev[lvl] = prev[lvl+1];
		while (prev[lvl]->sl_next[lvl] &&
				prev[lvl]->sl_next[lvl]->expire <= time_val)
			prev[lvl] = prev[lvl]->sl_next[lvl];
	}
}

/*
 * Given a timer node in the skiplist, find the previous entries for it at
 * all skiplist levels.
 */
static void
timer_get_prev_entries_for_node(struct rte_timer *tim, unsigned tim_lcore,
		struct rte_timer **prev)
{
	int i;
	/* to get a specific entry in the list, look for just lower than the time
	 * values, and then increment on each level individually if necessary
	 */
	timer_get_prev_entries(tim->expire - 1, tim_lcore, prev);
	for (i = priv_timer[tim_lcore].curr_skiplist_depth - 1; i >= 0; i--) {
		while (prev[i]->sl_next[i] != NULL &&
				prev[i]->sl_next[i] != tim &&
				prev[i]->sl_next[i]->expire <= tim->expire)
			prev[i] = prev[i]->sl_next[i];
	}
}

/*
 * add in list, lock if needed
 * timer must be in config state
 * timer must not be in a list
 */
static void
timer_add(struct rte_timer *tim, unsigned tim_lcore, int local_is_locked)
{
	unsigned lcore_id = rte_lcore_id();
	unsigned lvl;
	struct rte_timer *prev[MAX_SKIPLIST_DEPTH+1];

	/* if timer needs to be scheduled on another core, we need to
	 * lock the list; if it is on local core, we need to lock if
	 * we are not called from rte_timer_manage() */
	if (tim_lcore != lcore_id || !local_is_locked)
		rte_spinlock_lock(&priv_timer[tim_lcore].list_lock);

	/* find where exactly this element goes in the list of elements
	 * for each depth. */
	timer_get_prev_entries(tim->expire, tim_lcore, prev);

	/* now assign it a new level and add at that level */
	const unsigned tim_level = timer_get_skiplist_level(
			priv_timer[tim_lcore].curr_skiplist_depth);
	if (tim_level == priv_timer[tim_lcore].curr_skiplist_depth)
		priv_timer[tim_lcore].curr_skiplist_depth++;

	lvl = tim_level;
	while (lvl > 0) {
		tim->sl_next[lvl] = prev[lvl]->sl_next[lvl];
		prev[lvl]->sl_next[lvl] = tim;
		lvl--;
	}
	tim->sl_next[0] = prev[0]->sl_next[0];
	prev[0]->sl_next[0] = tim;

	/* save the lowest list entry into the expire field of the dummy hdr
	 * NOTE: this is not atomic on 32-bit*/
	priv_timer[tim_lcore].pending_head.expire = priv_timer[tim_lcore].\
			pending_head.sl_next[0]->expire;

	if (tim_lcore != lcore_id || !local_is_locked)
		rte_spinlock_unlock(&priv_timer[tim_lcore].list_lock);
}

/*
 * del from list, lock if needed
 * timer must be in config state
 * timer must be in a list
 */
static void
timer_del(struct rte_timer *tim, union rte_timer_status prev_status,
		int local_is_locked)
{
	unsigned lcore_id = rte_lcore_id();
	unsigned prev_owner = prev_status.owner;
	int i;
	struct rte_timer *prev[MAX_SKIPLIST_DEPTH+1];

	/* if timer needs is pending another core, we need to lock the
	 * list; if it is on local core, we need to lock if we are not
	 * called from rte_timer_manage() */
	if (prev_owner != lcore_id || !local_is_locked)
		rte_spinlock_lock(&priv_timer[prev_owner].list_lock);

	/* save the lowest list entry into the expire field of the dummy hdr.
	 * NOTE: this is not atomic on 32-bit */
	if (tim == priv_timer[prev_owner].pending_head.sl_next[0])
		priv_timer[prev_owner].pending_head.expire =
				((tim->sl_next[0] == NULL) ? 0 : tim->sl_next[0]->expire);

	/* adjust pointers from previous entries to point past this */
	timer_get_prev_entries_for_node(tim, prev_owner, prev);
	for (i = priv_timer[prev_owner].curr_skiplist_depth - 1; i >= 0; i--) {
		if (prev[i]->sl_next[i] == tim)
			prev[i]->sl_next[i] = tim->sl_next[i];
	}

	/* in case we deleted last entry at a level, adjust down max level */
	for (i = priv_timer[prev_owner].curr_skiplist_depth - 1; i >= 0; i--)
		if (priv_timer[prev_owner].pending_head.sl_next[i] == NULL)
			priv_timer[prev_owner].curr_skiplist_depth --;
		else
			break;

	if (prev_owner != lcore_id || !local_is_locked)
		rte_spinlock_unlock(&priv_timer[prev_owner].list_lock);
}

/* Reset and start the timer associated with the timer handle (private func) */
static int
__rte_timer_reset(struct rte_timer *tim, uint64_t expire,
		  uint64_t period, unsigned tim_lcore,
		  rte_timer_cb_t fct, void *arg,
		  int local_is_locked)
{
	union rte_timer_status prev_status, status;
	int ret;
	unsigned lcore_id = rte_lcore_id();

	/* round robin for tim_lcore */
	if (tim_lcore == (unsigned)LCORE_ID_ANY) {
		if (lcore_id < RTE_MAX_LCORE) {
			/* EAL thread with valid lcore_id */
			tim_lcore = rte_get_next_lcore(
				priv_timer[lcore_id].prev_lcore,
				0, 1);
			priv_timer[lcore_id].prev_lcore = tim_lcore;
		} else
			/* non-EAL thread do not run rte_timer_manage(),
			 * so schedule the timer on the first enabled lcore. */
			tim_lcore = rte_get_next_lcore(LCORE_ID_ANY, 0, 1);
	}

	/* wait that the timer is in correct status before update,
	 * and mark it as being configured */
	ret = timer_set_config_state(tim, &prev_status);
	if (ret < 0)
		return -1;

	__TIMER_STAT_ADD(reset, 1);
	if (prev_status.state == RTE_TIMER_RUNNING &&
	    lcore_id < RTE_MAX_LCORE) {
		priv_timer[lcore_id].updated = 1;
	}

	/* remove it from list */
	if (prev_status.state == RTE_TIMER_PENDING) {
		timer_del(tim, prev_status, local_is_locked);
		__TIMER_STAT_ADD(pending, -1);
	}

	tim->period = period;
	tim->expire = expire;
	tim->f = fct;
	tim->arg = arg;

	__TIMER_STAT_ADD(pending, 1);
	timer_add(tim, tim_lcore, local_is_locked);

	/* update state: as we are in CONFIG state, only us can modify
	 * the state so we don't need to use cmpset() here */
	rte_wmb();
	status.state = RTE_TIMER_PENDING;
	status.owner = (int16_t)tim_lcore;
	tim->status.u32 = status.u32;

	return 0;
}

/* Reset and start the timer associated with the timer handle tim */
int
rte_timer_reset(struct rte_timer *tim, uint64_t ticks,
		enum rte_timer_type type, unsigned tim_lcore,
		rte_timer_cb_t fct, void *arg)
{
	uint64_t cur_time = rte_get_timer_cycles();
	uint64_t period;

	if (unlikely((tim_lcore != (unsigned)LCORE_ID_ANY) &&
			!rte_lcore_is_enabled(tim_lcore)))
		return -1;

	if (type == PERIODICAL)
		period = ticks;
	else
		period = 0;

	return __rte_timer_reset(tim,  cur_time + ticks, period, tim_lcore,
			  fct, arg, 0);
}

/* loop until rte_timer_reset() succeed */
void
rte_timer_reset_sync(struct rte_timer *tim, uint64_t ticks,
		     enum rte_timer_type type, unsigned tim_lcore,
		     rte_timer_cb_t fct, void *arg)
{
	while (rte_timer_reset(tim, ticks, type, tim_lcore,
			       fct, arg) != 0)
		rte_pause();
}

/* Stop the timer associated with the timer handle tim */
int
rte_timer_stop(struct rte_timer *tim)
{
	union rte_timer_status prev_status, status;
	unsigned lcore_id = rte_lcore_id();
	int ret;

	/* wait that the timer is in correct status before update,
	 * and mark it as being configured */
	ret = timer_set_config_state(tim, &prev_status);
	if (ret < 0)
		return -1;

	__TIMER_STAT_ADD(stop, 1);
	if (prev_status.state == RTE_TIMER_RUNNING &&
	    lcore_id < RTE_MAX_LCORE) {
		priv_timer[lcore_id].updated = 1;
	}

	/* remove it from list */
	if (prev_status.state == RTE_TIMER_PENDING) {
		timer_del(tim, prev_status, 0);
		__TIMER_STAT_ADD(pending, -1);
	}

	/* mark timer as stopped */
	rte_wmb();
	status.state = RTE_TIMER_STOP;
	status.owner = RTE_TIMER_NO_OWNER;
	tim->status.u32 = status.u32;

	return 0;
}

/* loop until rte_timer_stop() succeed */
void
rte_timer_stop_sync(struct rte_timer *tim)
{
	while (rte_timer_stop(tim) != 0)
		rte_pause();
}

/* Test the PENDING status of the timer handle tim */
int
rte_timer_pending(struct rte_timer *tim)
{
	return tim->status.state == RTE_TIMER_PENDING;
}

/* must be called periodically, run all timer that expired */
void rte_timer_manage(void)
{
	union rte_timer_status status;
	struct rte_timer *tim, *next_tim;
	struct rte_timer *run_first_tim, **pprev;
	unsigned lcore_id = rte_lcore_id();
	struct rte_timer *prev[MAX_SKIPLIST_DEPTH + 1];
	uint64_t cur_time;
	int i, ret;

	/* timer manager only runs on EAL thread with valid lcore_id */
	assert(lcore_id < RTE_MAX_LCORE);

	__TIMER_STAT_ADD(manage, 1);
	/* optimize for the case where per-cpu list is empty */
	if (priv_timer[lcore_id].pending_head.sl_next[0] == NULL)
		return;
	cur_time = rte_get_timer_cycles();

#ifdef RTE_ARCH_X86_64
	/* on 64-bit the value cached in the pending_head.expired will be
	 * updated atomically, so we can consult that for a quick check here
	 * outside the lock */
	if (likely(priv_timer[lcore_id].pending_head.expire > cur_time))
		return;
#endif

	/* browse ordered list, add expired timers in 'expired' list */
	rte_spinlock_lock(&priv_timer[lcore_id].list_lock);

	/* if nothing to do just unlock and return */
	if (priv_timer[lcore_id].pending_head.sl_next[0] == NULL ||
	    priv_timer[lcore_id].pending_head.sl_next[0]->expire > cur_time) {
		rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
		return;
	}

	/* save start of list of expired timers */
	tim = priv_timer[lcore_id].pending_head.sl_next[0];

	/* break the existing list at current time point */
	timer_get_prev_entries(cur_time, lcore_id, prev);
	for (i = priv_timer[lcore_id].curr_skiplist_depth -1; i >= 0; i--) {
		if (prev[i] == &priv_timer[lcore_id].pending_head)
			continue;
		priv_timer[lcore_id].pending_head.sl_next[i] =
		    prev[i]->sl_next[i];
		if (prev[i]->sl_next[i] == NULL)
			priv_timer[lcore_id].curr_skiplist_depth--;
		prev[i] ->sl_next[i] = NULL;
	}

	/* transition run-list from PENDING to RUNNING */
	run_first_tim = tim;
	pprev = &run_first_tim;

	for ( ; tim != NULL; tim = next_tim) {
		next_tim = tim->sl_next[0];

		ret = timer_set_running_state(tim);
		if (likely(ret == 0)) {
			pprev = &tim->sl_next[0];
		} else {
			/* another core is trying to re-config this one,
			 * remove it from local expired list
			 */
			*pprev = next_tim;
		}
	}

	/* update the next to expire timer value */
	priv_timer[lcore_id].pending_head.expire =
	    (priv_timer[lcore_id].pending_head.sl_next[0] == NULL) ? 0 :
		priv_timer[lcore_id].pending_head.sl_next[0]->expire;

	rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);

	/* now scan expired list and call callbacks */
	for (tim = run_first_tim; tim != NULL; tim = next_tim) {
		next_tim = tim->sl_next[0];
		priv_timer[lcore_id].updated = 0;
		priv_timer[lcore_id].running_tim = tim;

		/* execute callback function with list unlocked */
		tim->f(tim, tim->arg);

		__TIMER_STAT_ADD(pending, -1);
		/* the timer was stopped or reloaded by the callback
		 * function, we have nothing to do here */
		if (priv_timer[lcore_id].updated == 1)
			continue;

		if (tim->period == 0) {
			/* remove from done list and mark timer as stopped */
			status.state = RTE_TIMER_STOP;
			status.owner = RTE_TIMER_NO_OWNER;
			rte_wmb();
			tim->status.u32 = status.u32;
		}
		else {
			/* keep it in list and mark timer as pending */
			rte_spinlock_lock(&priv_timer[lcore_id].list_lock);
			status.state = RTE_TIMER_PENDING;
			__TIMER_STAT_ADD(pending, 1);
			status.owner = (int16_t)lcore_id;
			rte_wmb();
			tim->status.u32 = status.u32;
			__rte_timer_reset(tim, tim->expire + tim->period,
				tim->period, lcore_id, tim->f, tim->arg, 1);
			rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
		}
	}
	priv_timer[lcore_id].running_tim = NULL;
}

/* dump statistics about timers */
void rte_timer_dump_stats(FILE *f)
{
#ifdef RTE_LIBRTE_TIMER_DEBUG
	struct rte_timer_debug_stats sum;
	unsigned lcore_id;

	memset(&sum, 0, sizeof(sum));
	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
		sum.reset += priv_timer[lcore_id].stats.reset;
		sum.stop += priv_timer[lcore_id].stats.stop;
		sum.manage += priv_timer[lcore_id].stats.manage;
		sum.pending += priv_timer[lcore_id].stats.pending;
	}
	fprintf(f, "Timer statistics:\n");
	fprintf(f, "  reset = %"PRIu64"\n", sum.reset);
	fprintf(f, "  stop = %"PRIu64"\n", sum.stop);
	fprintf(f, "  manage = %"PRIu64"\n", sum.manage);
	fprintf(f, "  pending = %"PRIu64"\n", sum.pending);
#else
	fprintf(f, "No timer statistics, RTE_LIBRTE_TIMER_DEBUG is disabled\n");
#endif
}