#include <assert.h>
#include <sys/queue.h>
-#include <rte_atomic.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_eal_memconfig.h>
#include <rte_memzone.h>
#include <rte_malloc.h>
#include <rte_errno.h>
-#include <rte_function_versioning.h>
#include "rte_timer.h"
const size_t mem_size = data_arr_size + sizeof(*rte_timer_mz_refcnt);
bool do_full_init = true;
- if (rte_timer_subsystem_initialized)
- return -EALREADY;
-
rte_mcfg_timer_lock();
+ if (rte_timer_subsystem_initialized) {
+ rte_mcfg_timer_unlock();
+ return -EALREADY;
+ }
+
mz = rte_memzone_lookup(mz_name);
if (mz == NULL) {
mz = rte_memzone_reserve_aligned(mz_name, mem_size,
rte_timer_data_arr[default_data_id].internal_flags |= FL_ALLOCATED;
(*rte_timer_mz_refcnt)++;
- rte_mcfg_timer_unlock();
-
rte_timer_subsystem_initialized = 1;
+ rte_mcfg_timer_unlock();
+
return 0;
}
void
rte_timer_subsystem_finalize(void)
{
- if (!rte_timer_subsystem_initialized)
- return;
-
rte_mcfg_timer_lock();
+ if (!rte_timer_subsystem_initialized) {
+ rte_mcfg_timer_unlock();
+ return;
+ }
+
if (--(*rte_timer_mz_refcnt) == 0)
rte_memzone_free(rte_timer_data_mz);
- rte_mcfg_timer_unlock();
-
rte_timer_subsystem_initialized = 0;
+
+ rte_mcfg_timer_unlock();
}
/* Initialize the timer handle tim for use */
status.state = RTE_TIMER_STOP;
status.owner = RTE_TIMER_NO_OWNER;
- tim->status.u32 = status.u32;
+ __atomic_store_n(&tim->status.u32, status.u32, __ATOMIC_RELAXED);
}
/*
/* 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;
+ prev_status.u32 = __atomic_load_n(&tim->status.u32, __ATOMIC_RELAXED);
+ while (success == 0) {
/* timer is running on another core
* or ready to run on local core, exit
*/
* 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);
+ /* CONFIG states are acting as locked states. If the
+ * timer is in CONFIG state, the state cannot be changed
+ * by other threads. So, we should use ACQUIRE here.
+ */
+ success = __atomic_compare_exchange_n(&tim->status.u32,
+ &prev_status.u32,
+ status.u32, 0,
+ __ATOMIC_ACQUIRE,
+ __ATOMIC_RELAXED);
}
ret_prev_status->u32 = prev_status.u32;
/* wait that the timer is in correct status before update,
* and mark it as running */
- while (success == 0) {
- prev_status.u32 = tim->status.u32;
+ prev_status.u32 = __atomic_load_n(&tim->status.u32, __ATOMIC_RELAXED);
+ while (success == 0) {
/* 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 being configured */
+ /* we know that the timer will be pending at this point
+ * mark it atomically as being running
+ */
status.state = RTE_TIMER_RUNNING;
status.owner = (int16_t)lcore_id;
- success = rte_atomic32_cmpset(&tim->status.u32,
- prev_status.u32,
- status.u32);
+ /* RUNNING states are acting as locked states. If the
+ * timer is in RUNNING state, the state cannot be changed
+ * by other threads. So, we should use ACQUIRE here.
+ */
+ success = __atomic_compare_exchange_n(&tim->status.u32,
+ &prev_status.u32,
+ status.u32, 0,
+ __ATOMIC_ACQUIRE,
+ __ATOMIC_RELAXED);
}
return 0;
/* 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;
+ /* The "RELEASE" ordering guarantees the memory operations above
+ * the status update are observed before the update by all threads
+ */
+ __atomic_store_n(&tim->status.u32, status.u32, __ATOMIC_RELEASE);
if (tim_lcore != lcore_id || !local_is_locked)
rte_spinlock_unlock(&priv_timer[tim_lcore].list_lock);
}
/* mark timer as stopped */
- rte_wmb();
status.state = RTE_TIMER_STOP;
status.owner = RTE_TIMER_NO_OWNER;
- tim->status.u32 = status.u32;
+ /* The "RELEASE" ordering guarantees the memory operations above
+ * the status update are observed before the update by all threads
+ */
+ __atomic_store_n(&tim->status.u32, status.u32, __ATOMIC_RELEASE);
return 0;
}
int
rte_timer_pending(struct rte_timer *tim)
{
- return tim->status.state == RTE_TIMER_PENDING;
+ return __atomic_load_n(&tim->status.state,
+ __ATOMIC_RELAXED) == RTE_TIMER_PENDING;
}
/* must be called periodically, run all timer that expired */
/* 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;
+ /* The "RELEASE" ordering guarantees the memory
+ * operations above the status update are observed
+ * before the update by all threads
+ */
+ __atomic_store_n(&tim->status.u32, status.u32,
+ __ATOMIC_RELEASE);
}
else {
/* keep it in list and mark timer as pending */
status.state = RTE_TIMER_PENDING;
__TIMER_STAT_ADD(priv_timer, pending, 1);
status.owner = (int16_t)lcore_id;
- rte_wmb();
- tim->status.u32 = status.u32;
+ /* The "RELEASE" ordering guarantees the memory
+ * operations above the status update are observed
+ * before the update by all threads
+ */
+ __atomic_store_n(&tim->status.u32, status.u32,
+ __ATOMIC_RELEASE);
__rte_timer_reset(tim, tim->expire + tim->period,
tim->period, lcore_id, tim->f, tim->arg, 1,
timer_data);
/* 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;
+ /* The "RELEASE" ordering guarantees the memory
+ * operations above the status update are observed
+ * before the update by all threads
+ */
+ __atomic_store_n(&tim->status.u32, status.u32,
+ __ATOMIC_RELEASE);
} else {
/* keep it in list and mark timer as pending */
rte_spinlock_lock(
status.state = RTE_TIMER_PENDING;
__TIMER_STAT_ADD(data->priv_timer, pending, 1);
status.owner = (int16_t)this_lcore;
- rte_wmb();
- tim->status.u32 = status.u32;
+ /* The "RELEASE" ordering guarantees the memory
+ * operations above the status update are observed
+ * before the update by all threads
+ */
+ __atomic_store_n(&tim->status.u32, status.u32,
+ __ATOMIC_RELEASE);
__rte_timer_reset(tim, tim->expire + tim->period,
tim->period, this_lcore, tim->f, tim->arg, 1,
data);
return 0;
}
+int64_t
+rte_timer_next_ticks(void)
+{
+ unsigned int lcore_id = rte_lcore_id();
+ struct rte_timer_data *timer_data;
+ struct priv_timer *priv_timer;
+ const struct rte_timer *tm;
+ uint64_t cur_time;
+ int64_t left = -ENOENT;
+
+ TIMER_DATA_VALID_GET_OR_ERR_RET(default_data_id, timer_data, -EINVAL);
+
+ priv_timer = timer_data->priv_timer;
+ cur_time = rte_get_timer_cycles();
+
+ rte_spinlock_lock(&priv_timer[lcore_id].list_lock);
+ tm = priv_timer[lcore_id].pending_head.sl_next[0];
+ if (tm) {
+ left = tm->expire - cur_time;
+ if (left < 0)
+ left = 0;
+ }
+ rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
+
+ return left;
+}
+
/* dump statistics about timers */
static void
__rte_timer_dump_stats(struct rte_timer_data *timer_data __rte_unused, FILE *f)
git.droids-corp.org / dpdk.git / blobdiff