linux-kernel - Re: [PATCH] igb: add a method to get the nic hw time stamping policy

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Date:	Mon, 13 May 2013 06:31:40 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Dong Zhu <bluezhudong@...il.com>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Tushar Dave <tushar.n.dave@...el.com>,
	Matthew Vick <matthew.vick@...el.com>,
	Jacob Keller <Jacob.e.keller@...el.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH] igb: add a method to get the nic hw time stamping
 policy

On Mon, May 13, 2013 at 10:12:36AM +0800, Dong Zhu wrote:
> 
> Can I use the 'flags' which members of hwtstamp_config to judge the
> ioctl request instead ? If not could you plz give me a new way to
> resolve this issue ?

You could use the flags field, as it has no definition yet.

But you still need to explain why this new functionality is needed in
the first place:

- You can query an interface's time stamping capabilities with the
  GET_TS_INFO ethtool command.

- You can choose a setting with SIOCSHWTSTAMP.

What more do you need?

Thanks,
Richard
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