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

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Date:	Sat, 11 May 2013 17:31:43 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Dong Zhu <bluezhudong@...il.com>
Cc:	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 Sat, May 11, 2013 at 10:02:19PM +0800, Dong Zhu wrote:
> 
> Currently kernel only support setting the hw time stamping policy
> through ioctl,now add a method to check which packets(Outgoing and
> Incoming) are time stamped by nic.

I don't really see a use case here. Applications needing time stamping
should just set the policy that they need.

>  struct hwtstamp_config {
> +	int rw;

Also, you can't just go adding fields to an ioctl.

>  	int flags;
>  	int tx_type;
>  	int rx_filter;
> -- 

Thanks,
Richard
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