* [dpdk-dev] [PATCH 0/2]
@ 2014-05-16 10:15 Vadim Suraev
2014-05-16 10:15 ` [dpdk-dev] [PATCH 1/2] timer bug fix Vadim Suraev
2014-05-16 10:15 ` [dpdk-dev] [PATCH 2/2] " Vadim Suraev
0 siblings, 2 replies; 5+ messages in thread
From: Vadim Suraev @ 2014-05-16 10:15 UTC (permalink / raw)
To: dev
two timer bugs fixed
lib/librte_timer/rte_timer.c | 21 ++++++++++-----------
lib/librte_timer/rte_timer.h | 7 ++++++-
2 files changed, 16 insertions(+), 12 deletions(-)
--
1.7.9.5
^ permalink raw reply [flat|nested] 5+ messages in thread
* [dpdk-dev] [PATCH 1/2] timer bug fix
2014-05-16 10:15 [dpdk-dev] [PATCH 0/2] Vadim Suraev
@ 2014-05-16 10:15 ` Vadim Suraev
2014-05-16 10:15 ` [dpdk-dev] [PATCH 2/2] " Vadim Suraev
1 sibling, 0 replies; 5+ messages in thread
From: Vadim Suraev @ 2014-05-16 10:15 UTC (permalink / raw)
To: dev
Description: when going running, the
pending count is not incremented.
Fix: decremend
pending when going running. Then, if periodic,
increment, if one shot - do nothing
Signed-off-by: Vadim Suraev <vadim.suraev@gmail.com>
---
lib/librte_timer/rte_timer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
index a3d5cca..f98e904 100755
--- a/lib/librte_timer/rte_timer.c
+++ b/lib/librte_timer/rte_timer.c
@@ -173,7 +173,7 @@ timer_set_running_state(struct rte_timer *tim)
/* timer is not pending anymore */
if (prev_status.state != RTE_TIMER_PENDING)
return -1;
-
+ __TIMER_STAT_ADD(pending, -1);
/* here, we know that timer is stopped or pending,
* mark it atomically as beeing configured */
status.state = RTE_TIMER_RUNNING;
@@ -555,7 +555,6 @@ void rte_timer_manage(void)
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();
@@ -564,6 +563,7 @@ void rte_timer_manage(void)
else {
/* keep it in list and mark timer as pending */
status.state = RTE_TIMER_PENDING;
+ __TIMER_STAT_ADD(pending, 1);
status.owner = (int16_t)lcore_id;
rte_wmb();
tim->status.u32 = status.u32;
--
1.7.9.5
^ permalink raw reply [flat|nested] 5+ messages in thread
* [dpdk-dev] [PATCH 2/2] timer bug fix
2014-05-16 10:15 [dpdk-dev] [PATCH 0/2] Vadim Suraev
2014-05-16 10:15 ` [dpdk-dev] [PATCH 1/2] timer bug fix Vadim Suraev
@ 2014-05-16 10:15 ` Vadim Suraev
2014-05-21 14:31 ` Olivier MATZ
1 sibling, 1 reply; 5+ messages in thread
From: Vadim Suraev @ 2014-05-16 10:15 UTC (permalink / raw)
To: dev
Description: while running a periodic timer's callback, if another
timer is manipulated, the updated flag is raised
preventing the periodic timer to reload.
Fix: move
updated flag from priv_timer to rte_timer stucture (one
per core)
Signed-off-by: Vadim Suraev <vadim.suraev@gmail.com>
---
lib/librte_timer/rte_timer.c | 17 ++++++++---------
lib/librte_timer/rte_timer.h | 7 ++++++-
2 files changed, 14 insertions(+), 10 deletions(-)
diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
index f98e904..0cc5fa9 100755
--- a/lib/librte_timer/rte_timer.c
+++ b/lib/librte_timer/rte_timer.c
@@ -58,11 +58,6 @@ 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;
@@ -107,10 +102,14 @@ void
rte_timer_init(struct rte_timer *tim)
{
union rte_timer_status status;
+ unsigned lcore_id;
status.state = RTE_TIMER_STOP;
status.owner = RTE_TIMER_NO_OWNER;
tim->status.u32 = status.u32;
+ for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id ++) {
+ tim->updated[lcore_id] = 0;
+ }
}
/*
@@ -378,7 +377,7 @@ __rte_timer_reset(struct rte_timer *tim, uint64_t expire,
return -1;
__TIMER_STAT_ADD(reset, 1);
- priv_timer[lcore_id].updated = 1;
+ tim->updated[lcore_id] = 1;
/* remove it from list */
if (prev_status.state == RTE_TIMER_PENDING) {
@@ -453,7 +452,7 @@ rte_timer_stop(struct rte_timer *tim)
return -1;
__TIMER_STAT_ADD(stop, 1);
- priv_timer[lcore_id].updated = 1;
+ tim->updated[lcore_id] = 1;
/* remove it from list */
if (prev_status.state == RTE_TIMER_PENDING) {
@@ -541,7 +540,7 @@ void rte_timer_manage(void)
rte_spinlock_unlock(&priv_timer[lcore_id].list_lock);
- priv_timer[lcore_id].updated = 0;
+ tim->updated[lcore_id] = 0;
/* execute callback function with list unlocked */
tim->f(tim, tim->arg);
@@ -550,7 +549,7 @@ void rte_timer_manage(void)
/* 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->updated[lcore_id] == 1)
continue;
if (tim->period == 0) {
diff --git a/lib/librte_timer/rte_timer.h b/lib/librte_timer/rte_timer.h
index c5f936b..235dfd6 100755
--- a/lib/librte_timer/rte_timer.h
+++ b/lib/librte_timer/rte_timer.h
@@ -129,6 +129,10 @@ struct rte_timer
uint64_t period; /**< Period of timer (0 if not periodic). */
rte_timer_cb_t *f; /**< Callback function. */
void *arg; /**< Argument to callback function. */
+ /** per-core variable that true if a timer was updated on this
+ * core since last reset of the variable */
+ int updated[RTE_MAX_LCORE];
+
};
@@ -142,7 +146,8 @@ struct rte_timer
{{RTE_TIMER_STOP, RTE_TIMER_NO_OWNER}}, \
0, \
NULL, \
- NULL, \
+ NULL, \
+ {0}, \
}
#else
/**
--
1.7.9.5
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] [PATCH 2/2] timer bug fix
2014-05-16 10:15 ` [dpdk-dev] [PATCH 2/2] " Vadim Suraev
@ 2014-05-21 14:31 ` Olivier MATZ
0 siblings, 0 replies; 5+ messages in thread
From: Olivier MATZ @ 2014-05-21 14:31 UTC (permalink / raw)
To: Vadim Suraev, dev
Hi Vadim,
On 05/16/2014 12:15 PM, Vadim Suraev wrote:
> Description: while running a periodic timer's callback, if another
> timer is manipulated, the updated flag is raised
> preventing the periodic timer to reload.
> Fix: move
> updated flag from priv_timer to rte_timer stucture (one
> per core)
>
> Signed-off-by: Vadim Suraev <vadim.suraev@gmail.com>
>
> [...]
>
> --- a/lib/librte_timer/rte_timer.h
> +++ b/lib/librte_timer/rte_timer.h
> @@ -129,6 +129,10 @@ struct rte_timer
> uint64_t period; /**< Period of timer (0 if not periodic). */
> rte_timer_cb_t *f; /**< Callback function. */
> void *arg; /**< Argument to callback function. */
> + /** per-core variable that true if a timer was updated on this
> + * core since last reset of the variable */
> + int updated[RTE_MAX_LCORE];
> +
> };
I don't think that adding a quite large table in the rte_timer
structure is a good idea.
Instead, I suggest to add a new field in the per-core structure
priv_timer:
struct rte_timer *cur_timer;
This timer pointer is set before invoking the callback of the
timer. Then, you could do this in rte_timer_reset() and
rte_timer_stop():
if (tim == priv_timer[lcore_id].cur_timer)
priv_timer[lcore_id].updated = 1;
I think it will also fix the problem you are describing (which
is a real problem), in a more simple way.
Regards,
Olivier
^ permalink raw reply [flat|nested] 5+ messages in thread
* [dpdk-dev] [PATCH 2/2] timer bug fix
2014-05-23 19:43 [dpdk-dev] [PATCH 0/2] timer bugs fixes Vadim Suraev
@ 2014-05-23 19:43 ` Vadim Suraev
0 siblings, 0 replies; 5+ messages in thread
From: Vadim Suraev @ 2014-05-23 19:43 UTC (permalink / raw)
To: dev
Bug: When a timer is running - if rte_timer_stop is
called, the pending decrement is skipped (decremented
only if the timer is pending) and due to the update
flag the future processing is skipped so the timer is
counted as pending while it is stopped. - the same
applies when rte_timer_reset is called but then the
pending statistics is additionally incremented so the
timer is counted pending twice.
Solution: decrement
the pending statistics after returning from the
callback. If rte_timer_stop was called, it skipped
decrementing the pending statistics. If
rte_time_reset was called, the pending statistics was
incremented. If neither was called and the timer is
periodic, the pending statistics is incremented when
it is reloaded
Signed-off-by: Vadim Suraev <vadim.suraev@gmail.com>
---
lib/librte_timer/rte_timer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
index d07232b..f0f0c2f 100755
--- a/lib/librte_timer/rte_timer.c
+++ b/lib/librte_timer/rte_timer.c
@@ -551,7 +551,7 @@ void rte_timer_manage(void)
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)
@@ -559,7 +559,6 @@ void rte_timer_manage(void)
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();
@@ -568,6 +567,7 @@ void rte_timer_manage(void)
else {
/* keep it in list and mark timer as pending */
status.state = RTE_TIMER_PENDING;
+ __TIMER_STAT_ADD(pending, 1);
status.owner = (int16_t)lcore_id;
rte_wmb();
tim->status.u32 = status.u32;
--
1.7.9.5
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-05-23 19:43 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2014-05-16 10:15 [dpdk-dev] [PATCH 0/2] Vadim Suraev
2014-05-16 10:15 ` [dpdk-dev] [PATCH 1/2] timer bug fix Vadim Suraev
2014-05-16 10:15 ` [dpdk-dev] [PATCH 2/2] " Vadim Suraev
2014-05-21 14:31 ` Olivier MATZ
2014-05-23 19:43 [dpdk-dev] [PATCH 0/2] timer bugs fixes Vadim Suraev
2014-05-23 19:43 ` [dpdk-dev] [PATCH 2/2] timer bug fix Vadim Suraev
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