From: Richard Cochran <richardcochran@gmail.com>
To: Willem de Bruijn <willemb@google.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net, stephen@networkplumber.org
Subject: Re: [PATCH net-next] net-timestamp: document deprecated syststamp
Date: Tue, 15 Jul 2014 08:31:01 +0200 [thread overview]
Message-ID: <20140715063101.GB4087@localhost.localdomain> (raw)
In-Reply-To: <1405374930-4763-1-git-send-email-willemb@google.com>
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@google.com>
Thanks a bunch for this!
Acked-by: Richard Cochran <richardcochran@gmail.com>
next prev parent reply other threads:[~2014-07-15 6:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-14 21:55 [PATCH net-next] net-timestamp: document deprecated syststamp Willem de Bruijn
2014-07-15 6:31 ` Richard Cochran [this message]
2014-07-15 23:33 ` David Miller
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