netdev - Re: [PATCH net] igb: Fix extts capture value format for 82580/i354/i350

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Date: Thu, 8 Jun 2023 12:51:50 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
	edumazet@...gle.com, netdev@...r.kernel.org,
	Yuezhen Luan <eggcar.luan@...il.com>, kernel.hbk@...il.com,
	richardcochran@...il.com, Jacob Keller <jacob.e.keller@...el.com>,
	Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com>
Subject: Re: [PATCH net] igb: Fix extts capture value format for
 82580/i354/i350

On Wed, Jun 07, 2023 at 09:41:16AM -0700, Tony Nguyen wrote:
> From: Yuezhen Luan <eggcar.luan@...il.com>
> 
> 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>
> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>