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

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Message-ID: <20130512131118.GH8399@zhudong.nay.redhat.com>
Date:	Sun, 12 May 2013 21:11:18 +0800
From:	Dong Zhu <bluezhudong@...il.com>
To:	Richard Cochran <richardcochran@...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 05:31:43PM +0200, Richard Cochran wrote:
> 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.

I think it is necessary to check which type of packets are stamped
by nic.

For I350 (igb), it only support HWTSTAMP_FILTER_NONE and
HWTSTAMP_FILTER_ALL of outgoing packets.For 82599EB(ixgbe), we can 
check more.

I add a new member of hwtstamp_config to judge the ioctl request is read
or write, we can specify the rw in the userspace using hwstamp_ctl
application to get the time stamped info.


-- 
Best Regards,
Dong Zhu
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