netdev - Re: [PATCH net V4 0/2] igb: ptp hardware clock

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Date:	Sun, 22 Jan 2012 19:57:24 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	Jacob Keller <jacob.e.keller@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net V4 0/2] igb: ptp hardware clock

On Sat, 2012-01-21 at 17:03 +0100, Richard Cochran wrote:
> * ChangeLog
> ** V4
>    - Use standard kernel cyclecounter/timecounter infrastructure
>      instead of a home grown counter overflow implementation.
> ** V3
>    - Driver compiles even without CONFIG_PTP_1588_CLOCK.
>    - Timestamping always works, even when PTP code missing or fails.
> ** V2
>    - Fixed wrong bit shifting in the 82576 code.
>    - Explained the timestamp locking with a comment in the code.
>    - Preserved the comments from the original timecompare implementation.
>    - Added an additional test within the overflow counter code to fix
>      a race condition. Details of the problem are given in the commit
>      message.
> 
> This patch series implements a PHC driver for the Intel 82576 and
> 82580 devices, as part of the igb driver.  Only the base clock
> operations are implemented. The hardware does have some ancillary
> features, but these can be easily added later.
> 
> The first patch adds the PHC driver code as a new source module but
> does not link it into the main igb driver. Because the system time
> counter is not so very wide, the code uses the overflow counter from
> the cyclecounter/timecounter code. Every read operation maintains the
> overflow counter, as does a "delayed work" watchdog. 
> 
> The second patch removes the timecompare code and links in the new
> functions.
> 
> I have tested the 82580 with good results. However, I don't have the
> 82576 and so would appreciate testing and feedback.
> 
> Thanks,
> Richard
> 
> 
> Richard Cochran (2):
>   igb: add PTP Hardware Clock code
>   igb: offer a PTP Hardware Clock instead of the timecompare method
> 
>  drivers/net/ethernet/intel/igb/Makefile   |    2 +-
>  drivers/net/ethernet/intel/igb/igb.h      |   20 ++-
>  drivers/net/ethernet/intel/igb/igb_main.c |  167 +------------
>  drivers/net/ethernet/intel/igb/igb_ptp.c  |  388 +++++++++++++++++++++++++++++
>  4 files changed, 407 insertions(+), 170 deletions(-)
>  create mode 100644 drivers/net/ethernet/intel/igb/igb_ptp.c
> 

Thanks Richard, I have added the patches to my queue.

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