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From: Cunming Liang <cunming.liang@intel.com>
To: dev@dpdk.org
Date: Mon, 2 Feb 2015 10:02:39 +0800
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Subject: [dpdk-dev] [PATCH v4 17/17] timer: add support to non-EAL thread
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Allow to setup timers only for EAL (lcore) threads (__lcore_id < MAX_LCORE_ID).
E.g. – dynamically created thread will be able to reset/stop timer for lcore thread,
but it will be not allowed to setup timer for itself or another non-lcore thread.
rte_timer_manage() for non-lcore thread would simply do nothing and return straightway.
Signed-off-by: Cunming Liang <cunming.liang@intel.com>
---
lib/librte_timer/rte_timer.c | 40 +++++++++++++++++++++++++++++++---------
lib/librte_timer/rte_timer.h | 2 +-
2 files changed, 32 insertions(+), 10 deletions(-)
diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
index 269a992..601c159 100644
--- a/lib/librte_timer/rte_timer.c
+++ b/lib/librte_timer/rte_timer.c
@@ -79,9 +79,10 @@ 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(); \
- 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)
@@ -127,15 +128,26 @@ timer_set_config_state(struct rte_timer *tim,
unsigned lcore_id;
lcore_id = rte_lcore_id();
+ if (lcore_id >= RTE_MAX_LCORE)
+ lcore_id = LCORE_ID_ANY;
/* 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;
+ /*
+ * prevent race condition of non-EAL threads
+ * to update the timer. When 'owner == LCORE_ID_ANY',
+ * it means updated by a non-EAL thread.
+ */
+ if (lcore_id == (unsigned)LCORE_ID_ANY &&
+ (uint16_t)lcore_id == prev_status.owner)
+ return -1;
+
/* timer is running on another core, exit */
if (prev_status.state == RTE_TIMER_RUNNING &&
- (unsigned)prev_status.owner != lcore_id)
+ prev_status.owner != (uint16_t)lcore_id)
return -1;
/* timer is being configured on another core */
@@ -366,9 +378,13 @@ __rte_timer_reset(struct rte_timer *tim, uint64_t expire,
/* 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) {
+ tim_lcore = rte_get_next_lcore(
+ priv_timer[lcore_id].prev_lcore,
+ 0, 1);
+ priv_timer[lcore_id].prev_lcore = tim_lcore;
+ } else
+ tim_lcore = rte_get_next_lcore(LCORE_ID_ANY, 0, 1);
}
/* wait that the timer is in correct status before update,
@@ -378,7 +394,8 @@ __rte_timer_reset(struct rte_timer *tim, uint64_t expire,
return -1;
__TIMER_STAT_ADD(reset, 1);
- if (prev_status.state == RTE_TIMER_RUNNING) {
+ if (prev_status.state == RTE_TIMER_RUNNING &&
+ lcore_id < RTE_MAX_LCORE) {
priv_timer[lcore_id].updated = 1;
}
@@ -455,7 +472,8 @@ rte_timer_stop(struct rte_timer *tim)
return -1;
__TIMER_STAT_ADD(stop, 1);
- if (prev_status.state == RTE_TIMER_RUNNING) {
+ if (prev_status.state == RTE_TIMER_RUNNING &&
+ lcore_id < RTE_MAX_LCORE) {
priv_timer[lcore_id].updated = 1;
}
@@ -499,6 +517,10 @@ void rte_timer_manage(void)
uint64_t cur_time;
int i, ret;
+ /* timer manager only runs on EAL thread */
+ if (lcore_id >= RTE_MAX_LCORE)
+ return;
+
__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)
diff --git a/lib/librte_timer/rte_timer.h b/lib/librte_timer/rte_timer.h
index 4907cf5..5c5df91 100644
--- a/lib/librte_timer/rte_timer.h
+++ b/lib/librte_timer/rte_timer.h
@@ -76,7 +76,7 @@ extern "C" {
#define RTE_TIMER_RUNNING 2 /**< State: timer function is running. */
#define RTE_TIMER_CONFIG 3 /**< State: timer is being configured. */
-#define RTE_TIMER_NO_OWNER -1 /**< Timer has no owner. */
+#define RTE_TIMER_NO_OWNER -2 /**< Timer has no owner. */
/**
* Timer type: Periodic or single (one-shot).
--
1.8.1.4