diff mbox series

[v9,1/2] ring: add reset API to flush the ring when not in use

Message ID 1562946877-50963-2-git-send-email-gavin.hu@arm.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series new ring reset api and use it by hash |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/mellanox-Performance-Testing success Performance Testing PASS
ci/intel-Performance-Testing success Performance Testing PASS
ci/Intel-compilation success Compilation OK

Commit Message

Gavin Hu July 12, 2019, 3:54 p.m. UTC 
  Currently, the flush is done by dequeuing the ring in a while loop. It is
much simpler to flush the queue by resetting the head and tail indices.

Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
 lib/librte_ring/rte_ring.c           |  7 +++++++
 lib/librte_ring/rte_ring.h           | 17 +++++++++++++++++
 lib/librte_ring/rte_ring_version.map |  7 +++++++
 3 files changed, 31 insertions(+)

Comments

Olivier Matz July 16, 2019, 9:01 a.m. UTC | #1 
On Fri, Jul 12, 2019 at 11:54:36PM +0800, Gavin Hu wrote:
> Currently, the flush is done by dequeuing the ring in a while loop. It is
> much simpler to flush the queue by resetting the head and tail indices.
> 
> Fixes: af75078fece3 ("first public release")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Acked-by: Olivier Matz <olivier.matz@6wind.com>
Olivier Matz July 16, 2019, 11:31 a.m. UTC | #2 
On Tue, Jul 16, 2019 at 11:01:21AM +0200, Olivier Matz wrote:
> On Fri, Jul 12, 2019 at 11:54:36PM +0800, Gavin Hu wrote:
> > Currently, the flush is done by dequeuing the ring in a while loop. It is
> > much simpler to flush the queue by resetting the head and tail indices.
> > 
> > Fixes: af75078fece3 ("first public release")
> > Cc: stable@dpdk.org

Actually it's not a fix, it adds a new API.

Is the patch in hash library intended to be backported? If yes, as it
seems to be a performance optimization, you'll need to describe what
scenario you're fixing and what is the performance gain. If no, the Cc
stable can be removed.

Thanks

> > 
> > Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> 
> Acked-by: Olivier Matz <olivier.matz@6wind.com>
Gavin Hu July 16, 2019, 2:03 p.m. UTC | #3 
Hi Olivier,  Thomas,

> -----Original Message-----
> From: Olivier Matz <olivier.matz@6wind.com>
> Sent: Tuesday, July 16, 2019 6:32 AM
> To: Gavin Hu (Arm Technology China) <Gavin.Hu@arm.com>
> Cc: dev@dpdk.org; nd <nd@arm.com>; thomas@monjalon.net;
> jerinj@marvell.com; hemant.agrawal@nxp.com; Nipun.gupta@nxp.com;
> Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>;
> i.maximets@samsung.com; stable@dpdk.org
> Subject: Re: [PATCH v9 1/2] ring: add reset API to flush the ring when not in
> use
> 
> On Tue, Jul 16, 2019 at 11:01:21AM +0200, Olivier Matz wrote:
> > On Fri, Jul 12, 2019 at 11:54:36PM +0800, Gavin Hu wrote:
> > > Currently, the flush is done by dequeuing the ring in a while loop. It is
> > > much simpler to flush the queue by resetting the head and tail indices.
> > >
> > > Fixes: af75078fece3 ("first public release")
> > > Cc: stable@dpdk.org
> 
> Actually it's not a fix, it adds a new API.
> 
> Is the patch in hash library intended to be backported? If yes, as it
> seems to be a performance optimization, you'll need to describe what
> scenario you're fixing and what is the performance gain. If no, the Cc
> stable can be removed.

As this is not in the data plan, I don't intend to backport. 
Do I need to submit a new version to remove the CC: lines? 

> > >
> > > Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> > > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> >
> > Acked-by: Olivier Matz <olivier.matz@6wind.com>
Thomas Monjalon July 16, 2019, 3:06 p.m. UTC | #4 
16/07/2019 16:03, Gavin Hu (Arm Technology China):
> From: Olivier Matz <olivier.matz@6wind.com>
> > On Tue, Jul 16, 2019 at 11:01:21AM +0200, Olivier Matz wrote:
> > > On Fri, Jul 12, 2019 at 11:54:36PM +0800, Gavin Hu wrote:
> > > > Currently, the flush is done by dequeuing the ring in a while loop. It is
> > > > much simpler to flush the queue by resetting the head and tail indices.
> > > >
> > > > Fixes: af75078fece3 ("first public release")
> > > > Cc: stable@dpdk.org
> > 
> > Actually it's not a fix, it adds a new API.
> > 
> > Is the patch in hash library intended to be backported? If yes, as it
> > seems to be a performance optimization, you'll need to describe what
> > scenario you're fixing and what is the performance gain. If no, the Cc
> > stable can be removed.
> 
> As this is not in the data plan, I don't intend to backport. 
> Do I need to submit a new version to remove the CC: lines? 

Yes please.
You can also remove the "fixes" line in the first patch.
Gavin Hu July 16, 2019, 7:25 p.m. UTC | #5 
Hi Thomas,
> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Tuesday, July 16, 2019 10:07 AM
> To: Gavin Hu (Arm Technology China) <Gavin.Hu@arm.com>
> Cc: Olivier Matz <olivier.matz@6wind.com>; dev@dpdk.org; nd
> <nd@arm.com>; jerinj@marvell.com; hemant.agrawal@nxp.com;
> Nipun.gupta@nxp.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; i.maximets@samsung.com;
> stable@dpdk.org
> Subject: Re: [PATCH v9 1/2] ring: add reset API to flush the ring when not in
> use
> 
> 16/07/2019 16:03, Gavin Hu (Arm Technology China):
> > From: Olivier Matz <olivier.matz@6wind.com>
> > > On Tue, Jul 16, 2019 at 11:01:21AM +0200, Olivier Matz wrote:
> > > > On Fri, Jul 12, 2019 at 11:54:36PM +0800, Gavin Hu wrote:
> > > > > Currently, the flush is done by dequeuing the ring in a while loop. It is
> > > > > much simpler to flush the queue by resetting the head and tail
> indices.
> > > > >
> > > > > Fixes: af75078fece3 ("first public release")
> > > > > Cc: stable@dpdk.org
> > >
> > > Actually it's not a fix, it adds a new API.
> > >
> > > Is the patch in hash library intended to be backported? If yes, as it
> > > seems to be a performance optimization, you'll need to describe what
> > > scenario you're fixing and what is the performance gain. If no, the Cc
> > > stable can be removed.
> >
> > As this is not in the data plan, I don't intend to backport.
> > Do I need to submit a new version to remove the CC: lines?
> 
> Yes please.
> You can also remove the "fixes" line in the first patch.
Sure, just sent out V10, thanks!
diff mbox series

Patch

diff --git a/lib/librte_ring/rte_ring.c b/lib/librte_ring/rte_ring.c
index b30b2aa..d9b3080 100644
--- a/lib/librte_ring/rte_ring.c
+++ b/lib/librte_ring/rte_ring.c
@@ -63,6 +63,13 @@  rte_ring_get_memsize(unsigned count)
 	return sz;
 }
 
+void
+rte_ring_reset(struct rte_ring *r)
+{
+	r->prod.head = r->cons.head = 0;
+	r->prod.tail = r->cons.tail = 0;
+}
+
 int
 rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
 	unsigned flags)
diff --git a/lib/librte_ring/rte_ring.h b/lib/librte_ring/rte_ring.h
index e5a175c..2a9f768 100644
--- a/lib/librte_ring/rte_ring.h
+++ b/lib/librte_ring/rte_ring.h
@@ -669,6 +669,23 @@  rte_ring_dequeue(struct rte_ring *r, void **obj_p)
 }
 
 /**
+ * Flush a ring.
+ *
+ * This function flush all the elements in a ring
+ *
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * @warning
+ * Make sure the ring is not in use while calling this function.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ */
+__rte_experimental
+void
+rte_ring_reset(struct rte_ring *r);
+
+/**
  * Return the number of entries in a ring.
  *
  * @param r
diff --git a/lib/librte_ring/rte_ring_version.map b/lib/librte_ring/rte_ring_version.map
index d935efd..581d9ca 100644
--- a/lib/librte_ring/rte_ring_version.map
+++ b/lib/librte_ring/rte_ring_version.map
@@ -17,3 +17,10 @@  DPDK_2.2 {
 	rte_ring_free;
 
 } DPDK_2.0;
+
+EXPERIMENTAL {
+	global:
+
+	rte_ring_reset;
+
+};