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

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Message-ID: <20130512172446.GA2484@netboy>
Date:	Sun, 12 May 2013 19:24:46 +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 Sun, May 12, 2013 at 10:25:55PM +0800, Dong Zhu wrote:
> Thanks for your pointing out my mistakes of CodingStyle.
> 
> > > struct hwtstamp_config {
> > >+	int rw;
> 
> My initial idea was that the type of rw should be enum like tx_type, but I am
> not sure whther it is necessary to define a new enum, if this patch could
> be accpeted I will ask someone about the rw. At that time I will change
> the type of rw to bool or define a new enum, then convert the if to
> switch if necessary.

You cannot add any new field at all. That would break a userland ABI.

Thanks,
Richard
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