/*-
* 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
* * 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
#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_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
-#include <rte_tailq.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
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;
/* 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(); \
- priv_timer[__lcore_id].stats.name += (n); \
+#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)
while (success == 0) {
prev_status.u32 = tim->status.u32;
- /* timer is running on another core, exit */
+ /* timer is running on another core
+ * or ready to run on local core, exit
+ */
if (prev_status.state == RTE_TIMER_RUNNING &&
- (unsigned)prev_status.owner != lcore_id)
+ (prev_status.owner != (uint16_t)lcore_id ||
+ tim != priv_timer[lcore_id].running_tim))
return -1;
/* timer is being configured on another core */
return -1;
/* here, we know that timer is stopped or pending,
- * mark it atomically as beeing configured */
+ * mark it atomically as being configured */
status.state = RTE_TIMER_RUNNING;
status.owner = (int16_t)lcore_id;
success = rte_atomic32_cmpset(&tim->status.u32,
/* round robin for tim_lcore */
if (tim_lcore == (unsigned)LCORE_ID_ANY) {
- tim_lcore = rte_get_next_lcore(priv_timer[lcore_id].prev_lcore,
- 0, 1);
- priv_timer[lcore_id].prev_lcore = tim_lcore;
+ 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,
return -1;
__TIMER_STAT_ADD(reset, 1);
- priv_timer[lcore_id].updated = 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) {
else
period = 0;
- __rte_timer_reset(tim, cur_time + ticks, period, tim_lcore,
+ return __rte_timer_reset(tim, cur_time + ticks, period, tim_lcore,
fct, arg, 0);
-
- return 0;
}
/* loop until rte_timer_reset() succeed */
rte_timer_cb_t fct, void *arg)
{
while (rte_timer_reset(tim, ticks, type, tim_lcore,
- fct, arg) != 0);
+ fct, arg) != 0)
+ rte_pause();
}
/* Stop the timer associated with the timer handle tim */
return -1;
__TIMER_STAT_ADD(stop, 1);
- priv_timer[lcore_id].updated = 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) {
{
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)
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 */
+ /* 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
/* 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)
- goto done;
+ 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--) {
- priv_timer[lcore_id].pending_head.sl_next[i] = prev[i]->sl_next[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;
}
- /* now scan expired list and call callbacks */
+ /* 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;
+ }
+ }
- /* this timer was not pending, continue */
- if (ret < 0)
- continue;
+ /* 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);
+ 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);
- rte_spinlock_lock(&priv_timer[lcore_id].list_lock);
-
+ __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)
if (tim->period == 0) {
/* remove from done list and mark timer as stopped */
- __TIMER_STAT_ADD(pending, -1);
status.state = RTE_TIMER_STOP;
status.owner = RTE_TIMER_NO_OWNER;
rte_wmb();
}
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, cur_time + tim->period,
- tim->period, lcore_id, tim->f, tim->arg, 1);
+ __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);
}
}
-
- /* 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;
-done:
- /* job finished, unlock the list lock */
- 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(void)
+void rte_timer_dump_stats(FILE *f)
{
#ifdef RTE_LIBRTE_TIMER_DEBUG
struct rte_timer_debug_stats sum;
sum.manage += priv_timer[lcore_id].stats.manage;
sum.pending += priv_timer[lcore_id].stats.pending;
}
- printf("Timer statistics:\n");
- printf(" reset = %"PRIu64"\n", sum.reset);
- printf(" stop = %"PRIu64"\n", sum.stop);
- printf(" manage = %"PRIu64"\n", sum.manage);
- printf(" pending = %"PRIu64"\n", sum.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
- printf("No timer statistics, RTE_LIBRTE_TIMER_DEBUG is disabled\n");
+ fprintf(f, "No timer statistics, RTE_LIBRTE_TIMER_DEBUG is disabled\n");
#endif
}
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