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

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Message-Id: <20140715.163307.45792518982293822.davem@davemloft.net>
Date:	Tue, 15 Jul 2014 16:33:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	willemb@...gle.com
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	richardcochran@...il.com
Subject: Re: [PATCH net-next] net-timestamp: document deprecated syststamp

From: Willem de Bruijn <willemb@...gle.com>
Date: Mon, 14 Jul 2014 17:55:30 -0400

> 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>

Applied.
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