1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
11 #include <sys/queue.h>
13 #include <rte_atomic.h>
14 #include <rte_common.h>
15 #include <rte_cycles.h>
16 #include <rte_per_lcore.h>
17 #include <rte_memory.h>
18 #include <rte_launch.h>
20 #include <rte_lcore.h>
21 #include <rte_branch_prediction.h>
22 #include <rte_spinlock.h>
23 #include <rte_random.h>
24 #include <rte_pause.h>
25 #include <rte_memzone.h>
26 #include <rte_malloc.h>
27 #include <rte_compat.h>
28 #include <rte_errno.h>
30 #include "rte_timer.h"
33 * Per-lcore info for timers.
36 struct rte_timer pending_head; /**< dummy timer instance to head up list */
37 rte_spinlock_t list_lock; /**< lock to protect list access */
39 /** per-core variable that true if a timer was updated on this
40 * core since last reset of the variable */
43 /** track the current depth of the skiplist */
44 unsigned curr_skiplist_depth;
46 unsigned prev_lcore; /**< used for lcore round robin */
48 /** running timer on this lcore now */
49 struct rte_timer *running_tim;
51 #ifdef RTE_LIBRTE_TIMER_DEBUG
52 /** per-lcore statistics */
53 struct rte_timer_debug_stats stats;
55 } __rte_cache_aligned;
57 #define FL_ALLOCATED (1 << 0)
58 struct rte_timer_data {
59 struct priv_timer priv_timer[RTE_MAX_LCORE];
60 uint8_t internal_flags;
63 #define RTE_MAX_DATA_ELS 64
64 static struct rte_timer_data *rte_timer_data_arr;
65 static const uint32_t default_data_id;
66 static uint32_t rte_timer_subsystem_initialized;
68 /* For maintaining older interfaces for a period */
69 static struct rte_timer_data default_timer_data;
71 /* when debug is enabled, store some statistics */
72 #ifdef RTE_LIBRTE_TIMER_DEBUG
73 #define __TIMER_STAT_ADD(priv_timer, name, n) do { \
74 unsigned __lcore_id = rte_lcore_id(); \
75 if (__lcore_id < RTE_MAX_LCORE) \
76 priv_timer[__lcore_id].stats.name += (n); \
79 #define __TIMER_STAT_ADD(priv_timer, name, n) do {} while (0)
83 timer_data_valid(uint32_t id)
85 return !!(rte_timer_data_arr[id].internal_flags & FL_ALLOCATED);
88 /* validate ID and retrieve timer data pointer, or return error value */
89 #define TIMER_DATA_VALID_GET_OR_ERR_RET(id, timer_data, retval) do { \
90 if (id >= RTE_MAX_DATA_ELS || !timer_data_valid(id)) \
92 timer_data = &rte_timer_data_arr[id]; \
96 rte_timer_data_alloc(uint32_t *id_ptr)
99 struct rte_timer_data *data;
101 if (!rte_timer_subsystem_initialized)
104 for (i = 0; i < RTE_MAX_DATA_ELS; i++) {
105 data = &rte_timer_data_arr[i];
106 if (!(data->internal_flags & FL_ALLOCATED)) {
107 data->internal_flags |= FL_ALLOCATED;
120 rte_timer_data_dealloc(uint32_t id)
122 struct rte_timer_data *timer_data;
123 TIMER_DATA_VALID_GET_OR_ERR_RET(id, timer_data, -EINVAL);
125 timer_data->internal_flags &= ~(FL_ALLOCATED);
131 rte_timer_subsystem_init_v20(void)
134 struct priv_timer *priv_timer = default_timer_data.priv_timer;
136 /* since priv_timer is static, it's zeroed by default, so only init some
139 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id ++) {
140 rte_spinlock_init(&priv_timer[lcore_id].list_lock);
141 priv_timer[lcore_id].prev_lcore = lcore_id;
144 VERSION_SYMBOL(rte_timer_subsystem_init, _v20, 2.0);
146 /* Init the timer library. Allocate an array of timer data structs in shared
147 * memory, and allocate the zeroth entry for use with original timer
148 * APIs. Since the intersection of the sets of lcore ids in primary and
149 * secondary processes should be empty, the zeroth entry can be shared by
150 * multiple processes.
153 rte_timer_subsystem_init_v1905(void)
155 const struct rte_memzone *mz;
156 struct rte_timer_data *data;
158 static const char *mz_name = "rte_timer_mz";
159 const size_t data_arr_size =
160 RTE_MAX_DATA_ELS * sizeof(*rte_timer_data_arr);
161 bool do_full_init = true;
163 if (rte_timer_subsystem_initialized)
168 mz = rte_memzone_reserve_aligned(mz_name, data_arr_size, SOCKET_ID_ANY,
169 0, RTE_CACHE_LINE_SIZE);
171 if (rte_errno == EEXIST) {
172 mz = rte_memzone_lookup(mz_name);
176 do_full_init = false;
181 rte_timer_data_arr = mz->addr;
184 for (i = 0; i < RTE_MAX_DATA_ELS; i++) {
185 data = &rte_timer_data_arr[i];
187 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE;
190 &data->priv_timer[lcore_id].list_lock);
191 data->priv_timer[lcore_id].prev_lcore =
197 rte_timer_data_arr[default_data_id].internal_flags |= FL_ALLOCATED;
199 rte_timer_subsystem_initialized = 1;
203 MAP_STATIC_SYMBOL(int rte_timer_subsystem_init(void),
204 rte_timer_subsystem_init_v1905);
205 BIND_DEFAULT_SYMBOL(rte_timer_subsystem_init, _v1905, 19.05);
208 rte_timer_subsystem_finalize(void)
210 if (!rte_timer_subsystem_initialized)
213 rte_timer_subsystem_initialized = 0;
216 /* Initialize the timer handle tim for use */
218 rte_timer_init(struct rte_timer *tim)
220 union rte_timer_status status;
222 status.state = RTE_TIMER_STOP;
223 status.owner = RTE_TIMER_NO_OWNER;
224 tim->status.u32 = status.u32;
228 * if timer is pending or stopped (or running on the same core than
229 * us), mark timer as configuring, and on success return the previous
230 * status of the timer
233 timer_set_config_state(struct rte_timer *tim,
234 union rte_timer_status *ret_prev_status,
235 struct priv_timer *priv_timer)
237 union rte_timer_status prev_status, status;
241 lcore_id = rte_lcore_id();
243 /* wait that the timer is in correct status before update,
244 * and mark it as being configured */
245 while (success == 0) {
246 prev_status.u32 = tim->status.u32;
248 /* timer is running on another core
249 * or ready to run on local core, exit
251 if (prev_status.state == RTE_TIMER_RUNNING &&
252 (prev_status.owner != (uint16_t)lcore_id ||
253 tim != priv_timer[lcore_id].running_tim))
256 /* timer is being configured on another core */
257 if (prev_status.state == RTE_TIMER_CONFIG)
260 /* here, we know that timer is stopped or pending,
261 * mark it atomically as being configured */
262 status.state = RTE_TIMER_CONFIG;
263 status.owner = (int16_t)lcore_id;
264 success = rte_atomic32_cmpset(&tim->status.u32,
269 ret_prev_status->u32 = prev_status.u32;
274 * if timer is pending, mark timer as running
277 timer_set_running_state(struct rte_timer *tim)
279 union rte_timer_status prev_status, status;
280 unsigned lcore_id = rte_lcore_id();
283 /* wait that the timer is in correct status before update,
284 * and mark it as running */
285 while (success == 0) {
286 prev_status.u32 = tim->status.u32;
288 /* timer is not pending anymore */
289 if (prev_status.state != RTE_TIMER_PENDING)
292 /* here, we know that timer is stopped or pending,
293 * mark it atomically as being configured */
294 status.state = RTE_TIMER_RUNNING;
295 status.owner = (int16_t)lcore_id;
296 success = rte_atomic32_cmpset(&tim->status.u32,
305 * Return a skiplist level for a new entry.
306 * This probabilistically gives a level with p=1/4 that an entry at level n
307 * will also appear at level n+1.
310 timer_get_skiplist_level(unsigned curr_depth)
312 #ifdef RTE_LIBRTE_TIMER_DEBUG
313 static uint32_t i, count = 0;
314 static uint32_t levels[MAX_SKIPLIST_DEPTH] = {0};
317 /* probability value is 1/4, i.e. all at level 0, 1 in 4 is at level 1,
318 * 1 in 16 at level 2, 1 in 64 at level 3, etc. Calculated using lowest
319 * bit position of a (pseudo)random number.
321 uint32_t rand = rte_rand() & (UINT32_MAX - 1);
322 uint32_t level = rand == 0 ? MAX_SKIPLIST_DEPTH : (rte_bsf32(rand)-1) / 2;
324 /* limit the levels used to one above our current level, so we don't,
325 * for instance, have a level 0 and a level 7 without anything between
327 if (level > curr_depth)
329 if (level >= MAX_SKIPLIST_DEPTH)
330 level = MAX_SKIPLIST_DEPTH-1;
331 #ifdef RTE_LIBRTE_TIMER_DEBUG
334 if (count % 10000 == 0)
335 for (i = 0; i < MAX_SKIPLIST_DEPTH; i++)
336 printf("Level %u: %u\n", (unsigned)i, (unsigned)levels[i]);
342 * For a given time value, get the entries at each level which
343 * are <= that time value.
346 timer_get_prev_entries(uint64_t time_val, unsigned tim_lcore,
347 struct rte_timer **prev, struct priv_timer *priv_timer)
349 unsigned lvl = priv_timer[tim_lcore].curr_skiplist_depth;
350 prev[lvl] = &priv_timer[tim_lcore].pending_head;
353 prev[lvl] = prev[lvl+1];
354 while (prev[lvl]->sl_next[lvl] &&
355 prev[lvl]->sl_next[lvl]->expire <= time_val)
356 prev[lvl] = prev[lvl]->sl_next[lvl];
361 * Given a timer node in the skiplist, find the previous entries for it at
362 * all skiplist levels.
365 timer_get_prev_entries_for_node(struct rte_timer *tim, unsigned tim_lcore,
366 struct rte_timer **prev,
367 struct priv_timer *priv_timer)
371 /* to get a specific entry in the list, look for just lower than the time
372 * values, and then increment on each level individually if necessary
374 timer_get_prev_entries(tim->expire - 1, tim_lcore, prev, priv_timer);
375 for (i = priv_timer[tim_lcore].curr_skiplist_depth - 1; i >= 0; i--) {
376 while (prev[i]->sl_next[i] != NULL &&
377 prev[i]->sl_next[i] != tim &&
378 prev[i]->sl_next[i]->expire <= tim->expire)
379 prev[i] = prev[i]->sl_next[i];
383 /* call with lock held as necessary
385 * timer must be in config state
386 * timer must not be in a list
389 timer_add(struct rte_timer *tim, unsigned int tim_lcore,
390 struct priv_timer *priv_timer)
393 struct rte_timer *prev[MAX_SKIPLIST_DEPTH+1];
395 /* find where exactly this element goes in the list of elements
397 timer_get_prev_entries(tim->expire, tim_lcore, prev, priv_timer);
399 /* now assign it a new level and add at that level */
400 const unsigned tim_level = timer_get_skiplist_level(
401 priv_timer[tim_lcore].curr_skiplist_depth);
402 if (tim_level == priv_timer[tim_lcore].curr_skiplist_depth)
403 priv_timer[tim_lcore].curr_skiplist_depth++;
407 tim->sl_next[lvl] = prev[lvl]->sl_next[lvl];
408 prev[lvl]->sl_next[lvl] = tim;
411 tim->sl_next[0] = prev[0]->sl_next[0];
412 prev[0]->sl_next[0] = tim;
414 /* save the lowest list entry into the expire field of the dummy hdr
415 * NOTE: this is not atomic on 32-bit*/
416 priv_timer[tim_lcore].pending_head.expire = priv_timer[tim_lcore].\
417 pending_head.sl_next[0]->expire;
421 * del from list, lock if needed
422 * timer must be in config state
423 * timer must be in a list
426 timer_del(struct rte_timer *tim, union rte_timer_status prev_status,
427 int local_is_locked, struct priv_timer *priv_timer)
429 unsigned lcore_id = rte_lcore_id();
430 unsigned prev_owner = prev_status.owner;
432 struct rte_timer *prev[MAX_SKIPLIST_DEPTH+1];
434 /* if timer needs is pending another core, we need to lock the
435 * list; if it is on local core, we need to lock if we are not
436 * called from rte_timer_manage() */
437 if (prev_owner != lcore_id || !local_is_locked)
438 rte_spinlock_lock(&priv_timer[prev_owner].list_lock);
440 /* save the lowest list entry into the expire field of the dummy hdr.
441 * NOTE: this is not atomic on 32-bit */
442 if (tim == priv_timer[prev_owner].pending_head.sl_next[0])
443 priv_timer[prev_owner].pending_head.expire =
444 ((tim->sl_next[0] == NULL) ? 0 : tim->sl_next[0]->expire);
446 /* adjust pointers from previous entries to point past this */
447 timer_get_prev_entries_for_node(tim, prev_owner, prev, priv_timer);
448 for (i = priv_timer[prev_owner].curr_skiplist_depth - 1; i >= 0; i--) {
449 if (prev[i]->sl_next[i] == tim)
450 prev[i]->sl_next[i] = tim->sl_next[i];
453 /* in case we deleted last entry at a level, adjust down max level */
454 for (i = priv_timer[prev_owner].curr_skiplist_depth - 1; i >= 0; i--)
455 if (priv_timer[prev_owner].pending_head.sl_next[i] == NULL)
456 priv_timer[prev_owner].curr_skiplist_depth --;
460 if (prev_owner != lcore_id || !local_is_locked)
461 rte_spinlock_unlock(&priv_timer[prev_owner].list_lock);
464 /* Reset and start the timer associated with the timer handle (private func) */
466 __rte_timer_reset(struct rte_timer *tim, uint64_t expire,
467 uint64_t period, unsigned tim_lcore,
468 rte_timer_cb_t fct, void *arg,
470 struct rte_timer_data *timer_data)
472 union rte_timer_status prev_status, status;
474 unsigned lcore_id = rte_lcore_id();
475 struct priv_timer *priv_timer = timer_data->priv_timer;
477 /* round robin for tim_lcore */
478 if (tim_lcore == (unsigned)LCORE_ID_ANY) {
479 if (lcore_id < RTE_MAX_LCORE) {
480 /* EAL thread with valid lcore_id */
481 tim_lcore = rte_get_next_lcore(
482 priv_timer[lcore_id].prev_lcore,
484 priv_timer[lcore_id].prev_lcore = tim_lcore;
486 /* non-EAL thread do not run rte_timer_manage(),
487 * so schedule the timer on the first enabled lcore. */
488 tim_lcore = rte_get_next_lcore(LCORE_ID_ANY, 0, 1);
491 /* wait that the timer is in correct status before update,
492 * and mark it as being configured */
493 ret = timer_set_config_state(tim, &prev_status, priv_timer);
497 __TIMER_STAT_ADD(priv_timer, reset, 1);
498 if (prev_status.state == RTE_TIMER_RUNNING &&
499 lcore_id < RTE_MAX_LCORE) {
500 priv_timer[lcore_id].updated = 1;
503 /* remove it from list */
504 if (prev_status.state == RTE_TIMER_PENDING) {
505 timer_del(tim, prev_status, local_is_locked, priv_timer);
506 __TIMER_STAT_ADD(priv_timer, pending, -1);
509 tim->period = period;
510 tim->expire = expire;
514 /* if timer needs to be scheduled on another core, we need to
515 * lock the destination list; if it is on local core, we need to lock if
516 * we are not called from rte_timer_manage()
518 if (tim_lcore != lcore_id || !local_is_locked)
519 rte_spinlock_lock(&priv_timer[tim_lcore].list_lock);
521 __TIMER_STAT_ADD(priv_timer, pending, 1);
522 timer_add(tim, tim_lcore, priv_timer);
524 /* update state: as we are in CONFIG state, only us can modify
525 * the state so we don't need to use cmpset() here */
527 status.state = RTE_TIMER_PENDING;
528 status.owner = (int16_t)tim_lcore;
529 tim->status.u32 = status.u32;
531 if (tim_lcore != lcore_id || !local_is_locked)
532 rte_spinlock_unlock(&priv_timer[tim_lcore].list_lock);
537 /* Reset and start the timer associated with the timer handle tim */
539 rte_timer_reset_v20(struct rte_timer *tim, uint64_t ticks,
540 enum rte_timer_type type, unsigned int tim_lcore,
541 rte_timer_cb_t fct, void *arg)
543 uint64_t cur_time = rte_get_timer_cycles();
546 if (unlikely((tim_lcore != (unsigned)LCORE_ID_ANY) &&
547 !(rte_lcore_is_enabled(tim_lcore) ||
548 rte_lcore_has_role(tim_lcore, ROLE_SERVICE))))
551 if (type == PERIODICAL)
556 return __rte_timer_reset(tim, cur_time + ticks, period, tim_lcore,
557 fct, arg, 0, &default_timer_data);
559 VERSION_SYMBOL(rte_timer_reset, _v20, 2.0);
562 rte_timer_reset_v1905(struct rte_timer *tim, uint64_t ticks,
563 enum rte_timer_type type, unsigned int tim_lcore,
564 rte_timer_cb_t fct, void *arg)
566 return rte_timer_alt_reset(default_data_id, tim, ticks, type,
567 tim_lcore, fct, arg);
569 MAP_STATIC_SYMBOL(int rte_timer_reset(struct rte_timer *tim, uint64_t ticks,
570 enum rte_timer_type type,
571 unsigned int tim_lcore,
572 rte_timer_cb_t fct, void *arg),
573 rte_timer_reset_v1905);
574 BIND_DEFAULT_SYMBOL(rte_timer_reset, _v1905, 19.05);
577 rte_timer_alt_reset(uint32_t timer_data_id, struct rte_timer *tim,
578 uint64_t ticks, enum rte_timer_type type,
579 unsigned int tim_lcore, rte_timer_cb_t fct, void *arg)
581 uint64_t cur_time = rte_get_timer_cycles();
583 struct rte_timer_data *timer_data;
585 TIMER_DATA_VALID_GET_OR_ERR_RET(timer_data_id, timer_data, -EINVAL);
587 if (type == PERIODICAL)
592 return __rte_timer_reset(tim, cur_time + ticks, period, tim_lcore,
593 fct, arg, 0, timer_data);
596 /* loop until rte_timer_reset() succeed */
598 rte_timer_reset_sync(struct rte_timer *tim, uint64_t ticks,
599 enum rte_timer_type type, unsigned tim_lcore,
600 rte_timer_cb_t fct, void *arg)
602 while (rte_timer_reset(tim, ticks, type, tim_lcore,
608 __rte_timer_stop(struct rte_timer *tim, int local_is_locked,
609 struct rte_timer_data *timer_data)
611 union rte_timer_status prev_status, status;
612 unsigned lcore_id = rte_lcore_id();
614 struct priv_timer *priv_timer = timer_data->priv_timer;
616 /* wait that the timer is in correct status before update,
617 * and mark it as being configured */
618 ret = timer_set_config_state(tim, &prev_status, priv_timer);
622 __TIMER_STAT_ADD(priv_timer, stop, 1);
623 if (prev_status.state == RTE_TIMER_RUNNING &&
624 lcore_id < RTE_MAX_LCORE) {
625 priv_timer[lcore_id].updated = 1;
628 /* remove it from list */
629 if (prev_status.state == RTE_TIMER_PENDING) {
630 timer_del(tim, prev_status, local_is_locked, priv_timer);
631 __TIMER_STAT_ADD(priv_timer, pending, -1);
634 /* mark timer as stopped */
636 status.state = RTE_TIMER_STOP;
637 status.owner = RTE_TIMER_NO_OWNER;
638 tim->status.u32 = status.u32;
643 /* Stop the timer associated with the timer handle tim */
645 rte_timer_stop_v20(struct rte_timer *tim)
647 return __rte_timer_stop(tim, 0, &default_timer_data);
649 VERSION_SYMBOL(rte_timer_stop, _v20, 2.0);
652 rte_timer_stop_v1905(struct rte_timer *tim)
654 return rte_timer_alt_stop(default_data_id, tim);
656 MAP_STATIC_SYMBOL(int rte_timer_stop(struct rte_timer *tim),
657 rte_timer_stop_v1905);
658 BIND_DEFAULT_SYMBOL(rte_timer_stop, _v1905, 19.05);
661 rte_timer_alt_stop(uint32_t timer_data_id, struct rte_timer *tim)
663 struct rte_timer_data *timer_data;
665 TIMER_DATA_VALID_GET_OR_ERR_RET(timer_data_id, timer_data, -EINVAL);
667 return __rte_timer_stop(tim, 0, timer_data);
670 /* loop until rte_timer_stop() succeed */
672 rte_timer_stop_sync(struct rte_timer *tim)
674 while (rte_timer_stop(tim) != 0)
678 /* Test the PENDING status of the timer handle tim */
680 rte_timer_pending(struct rte_timer *tim)
682 return tim->status.state == RTE_TIMER_PENDING;
685 /* must be called periodically, run all timer that expired */
687 __rte_timer_manage(struct rte_timer_data *timer_data)
689 union rte_timer_status status;
690 struct rte_timer *tim, *next_tim;
691 struct rte_timer *run_first_tim, **pprev;
692 unsigned lcore_id = rte_lcore_id();
693 struct rte_timer *prev[MAX_SKIPLIST_DEPTH + 1];
696 struct priv_timer *priv_timer = timer_data->priv_timer;
698 /* timer manager only runs on EAL thread with valid lcore_id */
699 assert(lcore_id < RTE_MAX_LCORE);
701 __TIMER_STAT_ADD(priv_timer, manage, 1);
702 /* optimize for the case where per-cpu list is empty */
703 if (priv_timer[lcore_id].pending_head.sl_next[0] == NULL)
705 cur_time = rte_get_timer_cycles();
708 /* on 64-bit the value cached in the pending_head.expired will be
709 * updated atomically, so we can consult that for a quick check here
710 * outside the lock */
711 if (likely(priv_timer[lcore_id].pending_head.expire > cur_time))
715 /* browse ordered list, add expired timers in 'expired' list */
716 rte_spinlock_lock(&priv_timer[lcore_id].list_lock);
718 /* if nothing to do just unlock and return */
719 if (priv_timer[lcore_id].pending_head.sl_next[0] == NULL ||
720 priv_timer[lcore_id].pending_head.sl_next[0]->expire > cur_time) {
721 rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
725 /* save start of list of expired timers */
726 tim = priv_timer[lcore_id].pending_head.sl_next[0];
728 /* break the existing list at current time point */
729 timer_get_prev_entries(cur_time, lcore_id, prev, priv_timer);
730 for (i = priv_timer[lcore_id].curr_skiplist_depth -1; i >= 0; i--) {
731 if (prev[i] == &priv_timer[lcore_id].pending_head)
733 priv_timer[lcore_id].pending_head.sl_next[i] =
735 if (prev[i]->sl_next[i] == NULL)
736 priv_timer[lcore_id].curr_skiplist_depth--;
737 prev[i] ->sl_next[i] = NULL;
740 /* transition run-list from PENDING to RUNNING */
742 pprev = &run_first_tim;
744 for ( ; tim != NULL; tim = next_tim) {
745 next_tim = tim->sl_next[0];
747 ret = timer_set_running_state(tim);
748 if (likely(ret == 0)) {
749 pprev = &tim->sl_next[0];
751 /* another core is trying to re-config this one,
752 * remove it from local expired list
758 /* update the next to expire timer value */
759 priv_timer[lcore_id].pending_head.expire =
760 (priv_timer[lcore_id].pending_head.sl_next[0] == NULL) ? 0 :
761 priv_timer[lcore_id].pending_head.sl_next[0]->expire;
763 rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
765 /* now scan expired list and call callbacks */
766 for (tim = run_first_tim; tim != NULL; tim = next_tim) {
767 next_tim = tim->sl_next[0];
768 priv_timer[lcore_id].updated = 0;
769 priv_timer[lcore_id].running_tim = tim;
771 /* execute callback function with list unlocked */
772 tim->f(tim, tim->arg);
774 __TIMER_STAT_ADD(priv_timer, pending, -1);
775 /* the timer was stopped or reloaded by the callback
776 * function, we have nothing to do here */
777 if (priv_timer[lcore_id].updated == 1)
780 if (tim->period == 0) {
781 /* remove from done list and mark timer as stopped */
782 status.state = RTE_TIMER_STOP;
783 status.owner = RTE_TIMER_NO_OWNER;
785 tim->status.u32 = status.u32;
788 /* keep it in list and mark timer as pending */
789 rte_spinlock_lock(&priv_timer[lcore_id].list_lock);
790 status.state = RTE_TIMER_PENDING;
791 __TIMER_STAT_ADD(priv_timer, pending, 1);
792 status.owner = (int16_t)lcore_id;
794 tim->status.u32 = status.u32;
795 __rte_timer_reset(tim, tim->expire + tim->period,
796 tim->period, lcore_id, tim->f, tim->arg, 1,
798 rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
801 priv_timer[lcore_id].running_tim = NULL;
805 rte_timer_manage_v20(void)
807 __rte_timer_manage(&default_timer_data);
809 VERSION_SYMBOL(rte_timer_manage, _v20, 2.0);
812 rte_timer_manage_v1905(void)
814 struct rte_timer_data *timer_data;
816 TIMER_DATA_VALID_GET_OR_ERR_RET(default_data_id, timer_data, -EINVAL);
818 __rte_timer_manage(timer_data);
822 MAP_STATIC_SYMBOL(int rte_timer_manage(void), rte_timer_manage_v1905);
823 BIND_DEFAULT_SYMBOL(rte_timer_manage, _v1905, 19.05);
826 rte_timer_alt_manage(uint32_t timer_data_id,
827 unsigned int *poll_lcores,
829 rte_timer_alt_manage_cb_t f)
831 unsigned int default_poll_lcores[] = {rte_lcore_id()};
832 union rte_timer_status status;
833 struct rte_timer *tim, *next_tim, **pprev;
834 struct rte_timer *run_first_tims[RTE_MAX_LCORE];
835 unsigned int this_lcore = rte_lcore_id();
836 struct rte_timer *prev[MAX_SKIPLIST_DEPTH + 1];
840 struct rte_timer_data *data;
841 struct priv_timer *privp;
844 TIMER_DATA_VALID_GET_OR_ERR_RET(timer_data_id, data, -EINVAL);
846 /* timer manager only runs on EAL thread with valid lcore_id */
847 assert(this_lcore < RTE_MAX_LCORE);
849 __TIMER_STAT_ADD(data->priv_timer, manage, 1);
851 if (poll_lcores == NULL) {
852 poll_lcores = default_poll_lcores;
853 nb_poll_lcores = RTE_DIM(default_poll_lcores);
856 for (i = 0; i < nb_poll_lcores; i++) {
857 poll_lcore = poll_lcores[i];
858 privp = &data->priv_timer[poll_lcore];
860 /* optimize for the case where per-cpu list is empty */
861 if (privp->pending_head.sl_next[0] == NULL)
863 cur_time = rte_get_timer_cycles();
866 /* on 64-bit the value cached in the pending_head.expired will
867 * be updated atomically, so we can consult that for a quick
868 * check here outside the lock
870 if (likely(privp->pending_head.expire > cur_time))
874 /* browse ordered list, add expired timers in 'expired' list */
875 rte_spinlock_lock(&privp->list_lock);
877 /* if nothing to do just unlock and return */
878 if (privp->pending_head.sl_next[0] == NULL ||
879 privp->pending_head.sl_next[0]->expire > cur_time) {
880 rte_spinlock_unlock(&privp->list_lock);
884 /* save start of list of expired timers */
885 tim = privp->pending_head.sl_next[0];
887 /* break the existing list at current time point */
888 timer_get_prev_entries(cur_time, poll_lcore, prev,
890 for (j = privp->curr_skiplist_depth - 1; j >= 0; j--) {
891 if (prev[j] == &privp->pending_head)
893 privp->pending_head.sl_next[j] =
895 if (prev[j]->sl_next[j] == NULL)
896 privp->curr_skiplist_depth--;
898 prev[j]->sl_next[j] = NULL;
901 /* transition run-list from PENDING to RUNNING */
902 run_first_tims[nb_runlists] = tim;
903 pprev = &run_first_tims[nb_runlists];
906 for ( ; tim != NULL; tim = next_tim) {
907 next_tim = tim->sl_next[0];
909 ret = timer_set_running_state(tim);
910 if (likely(ret == 0)) {
911 pprev = &tim->sl_next[0];
913 /* another core is trying to re-config this one,
914 * remove it from local expired list
920 /* update the next to expire timer value */
921 privp->pending_head.expire =
922 (privp->pending_head.sl_next[0] == NULL) ? 0 :
923 privp->pending_head.sl_next[0]->expire;
925 rte_spinlock_unlock(&privp->list_lock);
928 /* Now process the run lists */
931 uint64_t min_expire = UINT64_MAX;
934 /* Find the next oldest timer to process */
935 for (i = 0; i < nb_runlists; i++) {
936 tim = run_first_tims[i];
938 if (tim != NULL && tim->expire < min_expire) {
939 min_expire = tim->expire;
948 tim = run_first_tims[min_idx];
950 /* Move down the runlist from which we picked a timer to
953 run_first_tims[min_idx] = run_first_tims[min_idx]->sl_next[0];
955 data->priv_timer[this_lcore].updated = 0;
956 data->priv_timer[this_lcore].running_tim = tim;
958 /* Call the provided callback function */
961 __TIMER_STAT_ADD(data->priv_timer, pending, -1);
963 /* the timer was stopped or reloaded by the callback
964 * function, we have nothing to do here
966 if (data->priv_timer[this_lcore].updated == 1)
969 if (tim->period == 0) {
970 /* remove from done list and mark timer as stopped */
971 status.state = RTE_TIMER_STOP;
972 status.owner = RTE_TIMER_NO_OWNER;
974 tim->status.u32 = status.u32;
976 /* keep it in list and mark timer as pending */
978 &data->priv_timer[this_lcore].list_lock);
979 status.state = RTE_TIMER_PENDING;
980 __TIMER_STAT_ADD(data->priv_timer, pending, 1);
981 status.owner = (int16_t)this_lcore;
983 tim->status.u32 = status.u32;
984 __rte_timer_reset(tim, tim->expire + tim->period,
985 tim->period, this_lcore, tim->f, tim->arg, 1,
988 &data->priv_timer[this_lcore].list_lock);
991 data->priv_timer[this_lcore].running_tim = NULL;
997 /* Walk pending lists, stopping timers and calling user-specified function */
999 rte_timer_stop_all(uint32_t timer_data_id, unsigned int *walk_lcores,
1001 rte_timer_stop_all_cb_t f, void *f_arg)
1004 struct priv_timer *priv_timer;
1005 uint32_t walk_lcore;
1006 struct rte_timer *tim, *next_tim;
1007 struct rte_timer_data *timer_data;
1009 TIMER_DATA_VALID_GET_OR_ERR_RET(timer_data_id, timer_data, -EINVAL);
1011 for (i = 0; i < nb_walk_lcores; i++) {
1012 walk_lcore = walk_lcores[i];
1013 priv_timer = &timer_data->priv_timer[walk_lcore];
1015 rte_spinlock_lock(&priv_timer->list_lock);
1017 for (tim = priv_timer->pending_head.sl_next[0];
1020 next_tim = tim->sl_next[0];
1022 /* Call timer_stop with lock held */
1023 __rte_timer_stop(tim, 1, timer_data);
1029 rte_spinlock_unlock(&priv_timer->list_lock);
1035 /* dump statistics about timers */
1037 __rte_timer_dump_stats(struct rte_timer_data *timer_data __rte_unused, FILE *f)
1039 #ifdef RTE_LIBRTE_TIMER_DEBUG
1040 struct rte_timer_debug_stats sum;
1042 struct priv_timer *priv_timer = timer_data->priv_timer;
1044 memset(&sum, 0, sizeof(sum));
1045 for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
1046 sum.reset += priv_timer[lcore_id].stats.reset;
1047 sum.stop += priv_timer[lcore_id].stats.stop;
1048 sum.manage += priv_timer[lcore_id].stats.manage;
1049 sum.pending += priv_timer[lcore_id].stats.pending;
1051 fprintf(f, "Timer statistics:\n");
1052 fprintf(f, " reset = %"PRIu64"\n", sum.reset);
1053 fprintf(f, " stop = %"PRIu64"\n", sum.stop);
1054 fprintf(f, " manage = %"PRIu64"\n", sum.manage);
1055 fprintf(f, " pending = %"PRIu64"\n", sum.pending);
1057 fprintf(f, "No timer statistics, RTE_LIBRTE_TIMER_DEBUG is disabled\n");
1062 rte_timer_dump_stats_v20(FILE *f)
1064 __rte_timer_dump_stats(&default_timer_data, f);
1066 VERSION_SYMBOL(rte_timer_dump_stats, _v20, 2.0);
1069 rte_timer_dump_stats_v1905(FILE *f)
1071 return rte_timer_alt_dump_stats(default_data_id, f);
1073 MAP_STATIC_SYMBOL(int rte_timer_dump_stats(FILE *f),
1074 rte_timer_dump_stats_v1905);
1075 BIND_DEFAULT_SYMBOL(rte_timer_dump_stats, _v1905, 19.05);
1078 rte_timer_alt_dump_stats(uint32_t timer_data_id __rte_unused, FILE *f)
1080 struct rte_timer_data *timer_data;
1082 TIMER_DATA_VALID_GET_OR_ERR_RET(timer_data_id, timer_data, -EINVAL);
1084 __rte_timer_dump_stats(timer_data, f);