linux-kernel - Re: [PATCH v3 3/4] Add support for driver cross-timestamp to PTP_SYS

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Date:	Tue, 25 Aug 2015 09:31:11 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	"Hall, Christopher S" <christopher.s.hall@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"john.stultz@...aro.org" <john.stultz@...aro.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"peterz@...radead.org" <peterz@...radead.org>
Subject: Re: [PATCH v3 3/4] Add support for driver cross-timestamp to
 PTP_SYS_OFFSET ioctl

On Mon, Aug 24, 2015 at 08:16:51PM +0000, Hall, Christopher S wrote:
> 
> This means: remove code changes from the PTP_SYS_OFFSET ioctl and call getsynctime64() from a new ioctl PTP_SYS_OFFSET_PRECISE.  Right?

Yes.
 
> And use the same type (struct ptp_sys_offset) for the new ioctl?  Or should a new simplified struct be used? Such as:
> 
> struct precise_ptp_sys_offset {
> 	struct ptp_clock_time device;
> 	struct ptp_clock_time system;
> };

I don't have a strong preference either way.  I would not mind reusing
the existing struct.

> Does it make sense to keep the "cross-timestamp" capabilities flag as-is?

Yes, indeed.
 

Thanks,
Richard
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