linux-kernel - Re: [RFC v5 5/6] Add PTP_SYS_OFFSET_PRECISE for driver crosstimestamping

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Message-ID: <op.yauhpruq1774gr@chall-mobl2.amr.corp.intel.com>
Date:	Wed, 06 Jan 2016 17:42:53 -0800
From:	"Christopher Hall" <christopher.s.hall@...el.com>
To:	"Richard Cochran" <richardcochran@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, john.stultz@...aro.org,
	hpa@...or.com, jeffrey.t.kirsher@...el.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, kevin.b.stanton@...el.com
Subject: Re: [RFC v5 5/6] Add PTP_SYS_OFFSET_PRECISE for driver
 crosstimestamping

Hi Richard,

This all sounds fine.  Thanks for the feedback.  I'll roll this into the  
next patchset.

Chris

On Tue, 05 Jan 2016 07:27:32 -0800, Richard Cochran  
<richardcochran@...il.com> wrote:
> On Mon, Jan 04, 2016 at 04:45:22AM -0800, Christopher S. Hall wrote:
>> +	case PTP_SYS_OFFSET_PRECISE:
>> +		if (!ptp->info->getsynctime) {
>> +			err = -EINVAL;
>
> -EOPNOTSUPP would be better here.
>
>> +		precise_offset.sys_real.sec =
>> +			div_u64_rem(ktime_to_ns(xtstamp.sys_realtime),
>> +				    NSEC_PER_SEC, &rem);
>> +		precise_offset.sys_real.nsec = rem;
>
> How about this instead:
>
> 		ts = ktime_to_timespec64(xtstamp.sys_realtime);
> 		precise_offset.sys_real.sec = ts.tv_sec;
> 		precise_offset.sys_real.nsec = ts.tv_nsec;
>
>> +		precise_offset.sys_raw.sec =
>> +			div_u64_rem(ktime_to_ns(xtstamp.sys_monoraw),
>> +				    NSEC_PER_SEC, &rem);
>> +		precise_offset.sys_raw.nsec = rem;
>> +		precise_offset.dev.sec =
>> +			div_u64_rem(ktime_to_ns(xtstamp.device), NSEC_PER_SEC,
>> +				    &rem);
>> +		precise_offset.dev.nsec = rem;
>
> And for these as well.
>
> Thanks,
> Richard
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