[dpdk-stable] [PATCH] eal: fix epoll fd list rebuild

[dpdk-stable] [PATCH] eal: fix epoll fd list rebuild

[Harman Kalra]

An issue has been observed where epoll file descriptor
list rebuilds every time an interrupt/alarm event is
received.

eal_intr_process_interrupts() should notify pipe fd only
if any source is removed from the source list i.e (rv > 0)

Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister"
Cc: stable@dpdk.org

Signed-off-by: Harman Kalra <hkalra@marvell.com>
---
 lib/librte_eal/linux/eal_interrupts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/linux/eal_interrupts.c b/lib/librte_eal/linux/eal_interrupts.c
index 16e7a7d51..84eeaa1bc 100644
--- a/lib/librte_eal/linux/eal_interrupts.c
+++ b/lib/librte_eal/linux/eal_interrupts.c
@@ -1010,7 +1010,7 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 		}
 
 		/* notify the pipe fd waited by epoll_wait to rebuild the wait list */
-		if (rv >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
+		if (rv > 0 && write(intr_pipe.writefd, "1", 1) < 0) {
 			rte_spinlock_unlock(&intr_lock);
 			return -EPIPE;
 		}
-- 
2.18.0

Re: [dpdk-stable] [dpdk-dev] [PATCH] eal: fix epoll fd list rebuild

[Thomas Monjalon]

11/05/2020 15:43, Harman Kalra:
> An issue has been observed where epoll file descriptor
> list rebuilds every time an interrupt/alarm event is
> received.
> 
> eal_intr_process_interrupts() should notify pipe fd only
> if any source is removed from the source list i.e (rv > 0)
> 
> Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister"
> Cc: stable@dpdk.org
> 
> Signed-off-by: Harman Kalra <hkalra@marvell.com>

This patch is missing 20.05 because no review was done.
In general, we are missing a maintainer on "interrupts" area.

Re: [dpdk-stable] [EXT] Re: [dpdk-dev] [PATCH] eal: fix epoll fd list rebuild

[Harman Kalra]

On Sun, May 24, 2020 at 05:30:26PM +0200, Thomas Monjalon wrote:
> External Email
> 
> ----------------------------------------------------------------------
> 11/05/2020 15:43, Harman Kalra:
> > An issue has been observed where epoll file descriptor
> > list rebuilds every time an interrupt/alarm event is
> > received.
> > 
> > eal_intr_process_interrupts() should notify pipe fd only
> > if any source is removed from the source list i.e (rv > 0)
> > 
> > Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister"
> > Cc: stable@dpdk.org
> > 
> > Signed-off-by: Harman Kalra <hkalra@marvell.com>
> 
> This patch is missing 20.05 because no review was done.
> In general, we are missing a maintainer on "interrupts" area.

Hi Thomas,

If everybody is fine we can take up the responsibility of maintaining
interrupt subsystem. I can send a patch to update maintainer list for
the same.

Thanks
Harman

> 
> 

Re: [dpdk-stable] [dpdk-dev] [EXT] Re: [PATCH] eal: fix epoll fd list rebuild

[Harman Kalra]

On Mon, May 25, 2020 at 03:19:08PM +0530, Harman Kalra wrote:
> On Sun, May 24, 2020 at 05:30:26PM +0200, Thomas Monjalon wrote:
> > External Email
> > 
> > ----------------------------------------------------------------------
> > 11/05/2020 15:43, Harman Kalra:
> > > An issue has been observed where epoll file descriptor
> > > list rebuilds every time an interrupt/alarm event is
> > > received.
> > > 
> > > eal_intr_process_interrupts() should notify pipe fd only
> > > if any source is removed from the source list i.e (rv > 0)
> > > 
> > > Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister"
> > > Cc: stable@dpdk.org
> > > 
> > > Signed-off-by: Harman Kalra <hkalra@marvell.com>
> > 
> > This patch is missing 20.05 because no review was done.
> > In general, we are missing a maintainer on "interrupts" area.
> 

Ping.

> Hi Thomas,
> 
> If everybody is fine we can take up the responsibility of maintaining
> interrupt subsystem. I can send a patch to update maintainer list for
> the same.
> 
> Thanks
> Harman
> 
> > 
> > 

Re: [dpdk-stable] [dpdk-dev] [EXT] Re: [PATCH] eal: fix epoll fd list rebuild

[Harman Kalra]

On Wed, May 27, 2020 at 06:02:53PM +0530, Harman Kalra wrote:
> On Mon, May 25, 2020 at 03:19:08PM +0530, Harman Kalra wrote:
> > On Sun, May 24, 2020 at 05:30:26PM +0200, Thomas Monjalon wrote:
> > > External Email
> > > 
> > > ----------------------------------------------------------------------
> > > 11/05/2020 15:43, Harman Kalra:
> > > > An issue has been observed where epoll file descriptor
> > > > list rebuilds every time an interrupt/alarm event is
> > > > received.
> > > > 
> > > > eal_intr_process_interrupts() should notify pipe fd only
> > > > if any source is removed from the source list i.e (rv > 0)
> > > > 
> > > > Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister"
> > > > Cc: stable@dpdk.org
> > > > 
> > > > Signed-off-by: Harman Kalra <hkalra@marvell.com>
> > > 
> > > This patch is missing 20.05 because no review was done.
> > > In general, we are missing a maintainer on "interrupts" area.
> > 
> 
> Ping.
> 
> > Hi Thomas,
> > 
> > If everybody is fine we can take up the responsibility of maintaining
> > interrupt subsystem. I can send a patch to update maintainer list for
> > the same.

Sorry for wrong placement of ping in my last mail, as it is bit
confusing if it was for the patch.

Rather intention of this ping is to get input if we can take up the
maintainership of interrupt subsystem to help the community with the
reviews.

> > 
> > Thanks
> > Harman
> > 
> > > 
> > > 

Re: [dpdk-stable] [dpdk-dev] [EXT] Re: [PATCH] eal: fix epoll fd list rebuild

[Thomas Monjalon]

27/05/2020 14:44, Harman Kalra:
> On Wed, May 27, 2020 at 06:02:53PM +0530, Harman Kalra wrote:
> > On Mon, May 25, 2020 at 03:19:08PM +0530, Harman Kalra wrote:
> > > On Sun, May 24, 2020 at 05:30:26PM +0200, Thomas Monjalon wrote:
> > > > This patch is missing 20.05 because no review was done.
> > > > In general, we are missing a maintainer on "interrupts" area.
> > 
> > Ping.
> > 
> > > Hi Thomas,
> > > 
> > > If everybody is fine we can take up the responsibility of maintaining
> > > interrupt subsystem. I can send a patch to update maintainer list for
> > > the same.
> 
> Sorry for wrong placement of ping in my last mail, as it is bit
> confusing if it was for the patch.
> 
> Rather intention of this ping is to get input if we can take up the
> maintainership of interrupt subsystem to help the community with the
> reviews.

Please Cc everybody who contributed to this code.
Thanks

Re: [dpdk-stable] [dpdk-dev] [EXT] Re: [PATCH] eal: fix epoll fd list rebuild

[Harman Kalra]

On Wed, May 27, 2020 at 03:04:04PM +0200, Thomas Monjalon wrote:
> 27/05/2020 14:44, Harman Kalra:
> > On Wed, May 27, 2020 at 06:02:53PM +0530, Harman Kalra wrote:
> > > On Mon, May 25, 2020 at 03:19:08PM +0530, Harman Kalra wrote:
> > > > On Sun, May 24, 2020 at 05:30:26PM +0200, Thomas Monjalon wrote:
> > > > > This patch is missing 20.05 because no review was done.
> > > > > In general, we are missing a maintainer on "interrupts" area.
> > > 
> > > Ping.
> > > 
> > > > Hi Thomas,
> > > > 
> > > > If everybody is fine we can take up the responsibility of maintaining
> > > > interrupt subsystem. I can send a patch to update maintainer list for
> > > > the same.
> > 
> > Sorry for wrong placement of ping in my last mail, as it is bit
> > confusing if it was for the patch.
> > 
> > Rather intention of this ping is to get input if we can take up the
> > maintainership of interrupt subsystem to help the community with the
> > reviews.
> 
> Please Cc everybody who contributed to this code.
> Thanks

Adding all the code contributors for interrupt subsystem in CC.

Currently eal interrupt layer doesnt have a maintainer, if anybody
is willing to take up the responsibility for maintaining it, please feel
free to take it up or else I would like to volunteer for the same if
everybody is fine with the decision.

Thanks
Harman

> 
> 
> 

[dpdk-stable] [PATCH v2] eal: fix epoll fd list rebuild

[Harman Kalra]

An issue has been observed where epoll file descriptor
list rebuilds every time an interrupt/alarm event is
received.

eal_intr_process_interrupts() should notify pipe fd only
if any source is removed from the source list i.e (rv > 0)

Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister")
Cc: stable@dpdk.org

Signed-off-by: Harman Kalra <hkalra@marvell.com>
---
*V2: missing closing bracket in Fixes tag in V1

 lib/librte_eal/linux/eal_interrupts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/linux/eal_interrupts.c b/lib/librte_eal/linux/eal_interrupts.c
index 16e7a7d51..84eeaa1bc 100644
--- a/lib/librte_eal/linux/eal_interrupts.c
+++ b/lib/librte_eal/linux/eal_interrupts.c
@@ -1010,7 +1010,7 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 		}
 
 		/* notify the pipe fd waited by epoll_wait to rebuild the wait list */
-		if (rv >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
+		if (rv > 0 && write(intr_pipe.writefd, "1", 1) < 0) {
 			rte_spinlock_unlock(&intr_lock);
 			return -EPIPE;
 		}
-- 
2.18.0

Re: [dpdk-stable] [dpdk-dev] [PATCH v2] eal: fix epoll fd list rebuild

[Thomas Monjalon]

19/06/2020 15:59, Harman Kalra:
> An issue has been observed where epoll file descriptor
> list rebuilds every time an interrupt/alarm event is
> received.
> 
> eal_intr_process_interrupts() should notify pipe fd only
> if any source is removed from the source list i.e (rv > 0)
> 
> Fixes: 0c7ce182a760 ("eal: add pending interrupt callback unregister")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Harman Kalra <hkalra@marvell.com>

Applied, thanks