netdev - Re: [PATCH net-next] net-timestamp: document deprecated syststamp

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Date:	Tue, 15 Jul 2014 08:31:01 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Willem de Bruijn <willemb@...gle.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	stephen@...workplumber.org
Subject: Re: [PATCH net-next] net-timestamp: document deprecated syststamp

On Mon, Jul 14, 2014 at 05:55:30PM -0400, Willem de Bruijn wrote:
> The SO_TIMESTAMPING API defines option SOF_TIMESTAMPING_SYS_HW.
> This feature is deprecated. It should not be implemented by new
> device drivers. Existing drivers do not implement it, either --
> with one exception.
> 
> Driver developers are encouraged to expose the NIC hw clock as a
> PTP HW clock source, instead, and synchronize system time to the
> HW source.
> 
> The control flag cannot be removed due to being part of the ABI, nor
> can the structure scm_timestamping that is returned. Due to the one
> legacy driver, the internal datapath and structure are not removed.
> 
> This patch only clearly marks the interface as deprecated. Device
> drivers should always return a syststamp value of zero.
> 
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Thanks a bunch for this!

Acked-by: Richard Cochran <richardcochran@...il.com>
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