netdev - RE: [net-next 07/12] ixgbe: Enable timesync clock-out feature for PPS support on X540

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Date:	Fri, 11 May 2012 18:09:11 +0000
From:	"Keller, Jacob E" <jacob.e.keller@...el.com>
To:	Richard Cochran <richardcochran@...il.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>
Subject: RE: [net-next 07/12] ixgbe: Enable timesync clock-out feature for
 PPS support on X540

> -----Original Message-----
> From: Richard Cochran [mailto:richardcochran@...il.com]
> Sent: Thursday, May 10, 2012 10:36 PM
> To: Keller, Jacob E
> Cc: Kirsher, Jeffrey T; davem@...emloft.net; netdev@...r.kernel.org;
> gospo@...hat.com; sassmann@...hat.com
> Subject: Re: [net-next 07/12] ixgbe: Enable timesync clock-out feature for PPS
> support on X540
> 
> On Thu, May 10, 2012 at 09:54:52PM +0000, Keller, Jacob E wrote:
> > > Since this function is called in every interrupt, I would check this
> > > flag first thing.
> > >
> > Not sure what you mean? Check this before checking the other interrupts?
> > I can do that.
> 
> I only meant that, assuming that the other interrupt sources are much more
> frequent than the PPS, the normal case will be that the PPS flag is not set.
> 
> It would be more efficient (that is, shorter ISR code path in normal
> case) to check the flag first, perhaps like this.
> 
> ixgbe_intr()
> {
> 	...
> #ifdef CONFIG_IXGBE_PTP
> 	if (eicr & IXGBE_EICR_TIMESYNC)
> 		ixgbe_ptp_check_pps_event(adapter, eicr); #endif
> 	...
> }

Ok. This makes sense. :) Check the flag before checking the hardware type.

- Jake

> 
> Thanks,
> Richard
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