From: Gavin Hu <Gavin.Hu@arm.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>,
Kiran Kumar <kkokkilagadda@caviumnetworks.com>,
"jerin.jacob@caviumnetworks.com" <jerin.jacob@caviumnetworks.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
Subject: Re: [dpdk-dev] [PATCH v2] kni: fix kni Rx fifo producer synchronization
Date: Mon, 27 Aug 2018 15:40:07 +0000 [thread overview]
Message-ID: <VI1PR08MB31672E6BFECA652376D9F2058F0B0@VI1PR08MB3167.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <649064d2-430c-d761-44ce-453e1a14031a@intel.com>
This fix is not complete, kni_fifo_get requires a read fence also, otherwise it probably gets stale data on a weak ordering platform.
> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Ferruh Yigit
> Sent: Monday, August 27, 2018 10:08 PM
> To: Kiran Kumar <kkokkilagadda@caviumnetworks.com>;
> jerin.jacob@caviumnetworks.com
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2] kni: fix kni Rx fifo producer
> synchronization
>
> On 8/16/2018 10:55 AM, Kiran Kumar wrote:
> > With existing code in kni_fifo_put, rx_q values are not being updated
> > before updating fifo_write. While reading rx_q in kni_net_rx_normal,
> > This is causing the sync issue on other core. So adding a write
> > barrier to make sure the values being synced before updating fifo_write.
> >
> > Fixes: 3fc5ca2f6352 ("kni: initial import")
> >
> > Signed-off-by: Kiran Kumar <kkokkilagadda@caviumnetworks.com>
> > Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
>
> Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
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next prev parent reply other threads:[~2018-08-27 15:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-09 10:23 [dpdk-dev] [PATCH] kni: fix kni rx " Kiran Kumar
2018-08-09 11:30 ` Ferruh Yigit
2018-08-16 6:52 ` Jerin Jacob
2018-08-16 12:28 ` Ferruh Yigit
2018-08-16 9:01 ` Jerin Jacob
2018-08-16 9:55 ` [dpdk-dev] [PATCH v2] kni: fix kni Rx " Kiran Kumar
2018-08-27 14:07 ` Ferruh Yigit
2018-08-27 15:40 ` Gavin Hu [this message]
2018-08-28 10:43 ` Kokkilagadda, Kiran
2018-08-28 10:51 ` Kokkilagadda, Kiran
2018-08-28 19:30 ` Gavin Hu
2018-08-29 4:59 ` Honnappa Nagarahalli
2018-08-29 5:49 ` Kokkilagadda, Kiran
2018-08-29 7:34 ` Ola Liljedahl
2018-08-29 8:28 ` Jerin Jacob
2018-08-29 8:47 ` Ola Liljedahl
2018-08-29 8:57 ` Jerin Jacob
2018-09-13 17:40 ` Honnappa Nagarahalli
2018-09-13 17:51 ` Jerin Jacob
2018-09-13 23:45 ` Honnappa Nagarahalli
2018-09-14 2:45 ` Jerin Jacob
2018-09-18 15:53 ` Ferruh Yigit
2018-09-19 5:37 ` Honnappa Nagarahalli
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