netdev - RE: [Intel-wired-lan] [PATCHv3 net] igb: Fix extts capture value format for 82580/i354/i350

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Date: Wed, 7 Jun 2023 03:23:07 +0000
From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To: Yuezhen Luan <eggcar.luan@...il.com>, "Brandeburg, Jesse"
	<jesse.brandeburg@...el.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCHv3 net] igb: Fix extts capture value
 format for 82580/i354/i350

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Yuezhen Luan
> Sent: Friday, June 2, 2023 12:34 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com
> Cc: netdev@...r.kernel.org; intel-wired-lan@...ts.osuosl.org; linux-kernel@...r.kernel.org; Yuezhen Luan <eggcar.luan@...il.com>
> Subject: [Intel-wired-lan] [PATCHv3 net] igb: Fix extts capture value format for 82580/i354/i350
>
> 82580/i354/i350 features circle-counter-like timestamp registers that are different with newer i210. The EXTTS capture value in AUXTSMPx should be converted from raw circle counter value to timestamp value in resolution of 1 nanosec by the driver.
>
> This issue can be reproduced on i350 nics, connecting an 1PPS signal to a SDP pin, and run 'ts2phc' command to read external 1PPS timestamp value. On i210 this works fine, but on i350 the extts is not correctly converted.
>
> The i350/i354/82580's SYSTIM and other timestamp registers are 40bit counters, presenting time range of 2^40 ns, that means these registers overflows every about 1099s. This causes all these regs can't be > used directly in contrast to the newer i210/i211s.
>
> The igb driver needs to convert these raw register values to valid time stamp format by using kernel timecounter apis for i350s families. Here the igb_extts() just forgot to do the convert.
>
> Fixes: 38970eac41db ("igb: support EXTTS on 82580/i354/i350")
> Signed-off-by: Yuezhen Luan <eggcar.luan@...il.com>
> ---
> V2 -> V3: Add 'Fixes' tag, and add 'net' tag in patch title
> V1 -> V2: Fix typo in the source code, and add detailed explanation
>
> drivers/net/ethernet/intel/igb/igb_main.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)