netdev - RE: [PATCH net v2] net: renesas: rswitch: Fix timestamp feature after all descriptors are used

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Message-ID:
 <TYBPR01MB53419CEF615E14B8ACD3ADC6D850A@TYBPR01MB5341.jpnprd01.prod.outlook.com>
Date: Thu, 8 Jun 2023 00:21:13 +0000
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To: Simon Horman <simon.horman@...igine.com>
CC: "s.shtylyov@....ru" <s.shtylyov@....ru>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	Phong Hoang <phong.hoang.wz@...esas.com>
Subject: RE: [PATCH net v2] net: renesas: rswitch: Fix timestamp feature after
 all descriptors are used

Hi Simon-san,

> From: Simon Horman, Sent: Thursday, June 8, 2023 12:26 AM
> 
> On Wed, Jun 07, 2023 at 04:01:41PM +0900, Yoshihiro Shimoda wrote:
> > The timestamp descriptors were intended to act cyclically. Descriptors
> > from index 0 through gq->ring_size - 1 contain actual information, and
> > the last index (gq->ring_size) should have LINKFIX to indicate
> > the first index 0 descriptor. However, thie LINKFIX value is missing,
> 
> Hi Shimoda-san,
> 
> a very minor nit, in case you end up posting a v3 for some other reason:
> 
> 	thie -> the

Thank you for your review! I'll fix this on v3.

Best regards,
Yoshihiro Shimoda

> > causing the timestamp feature to stop after all descriptors are used.
> > To resolve this issue, set the LINKFIX to the timestamp descritors.
> >
> > Reported-by: Phong Hoang <phong.hoang.wz@...esas.com>
> > Fixes: 33f5d733b589 ("net: renesas: rswitch: Improve TX timestamp accuracy")
> 
> ...