netdev - RE: [PATCH] net: added support for 40GbE link.

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Date:	Wed, 27 Jun 2012 09:08:26 +0000
From:	<Parav.Pandit@...lex.Com>
To:	<bhutchings@...arflare.com>, <Parav.Pandit@...lex.Com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: RE: [PATCH] net: added support for 40GbE link.

o.k. I am sending PATCH v1 with suggested fixes in short while for ethtool and kernel both.

Parav

> -----Original Message-----
> From: Ben Hutchings [mailto:bhutchings@...arflare.com]
> Sent: Tuesday, June 19, 2012 7:42 PM
> To: Pandit, Parav
> Cc: davem@...emloft.net; netdev@...r.kernel.org
> Subject: RE: [PATCH] net: added support for 40GbE link.
> 
> On Tue, 2012-06-19 at 07:42 +0000, Parav.Pandit@...lex.Com wrote:
> > > -----Original Message-----
> > > From: David Miller [mailto:davem@...emloft.net]
> > > Sent: Tuesday, June 19, 2012 1:05 PM
> > > To: Pandit, Parav
> > > Cc: bhutchings@...arflare.com; netdev@...r.kernel.org
> > > Subject: Re: [PATCH] net: added support for 40GbE link.
> > >
> > > From: <Parav.Pandit@...lex.Com>
> > > Date: Tue, 19 Jun 2012 07:33:12 +0000
> > >
> > > > Should eventually all net driver should remove using SPEED_xxxxxx
> > > > and
> > > start using hard coded value of 10, 100, 1000, 20000?
> > >
> > > No, the ones that exist can stay, just no new ones.
> > >
> > So driver which supports 40Gpbs, 100Gbps should hardcode to 40000,
> 100000 respectively?
> 
> Right.
> 
> > > > That means ethtool_cmd_speed() should not be called in this function?
> > >
> > > Ben said that it must be called, what are you talking about?
> >
> > Sorry, I wanted to ask - Do you need switch case for speed like below new
> code or its should be speed independent code?
> >                 switch (ethtool_cmd_speed()) {
> >                 case SPEED_100:
> >                 case SPEED_10:
> >                         return DEFAULT_PRB_RETIRE_TOV;
> >                 default:
> >                         msec = 1;
> >                         div = ethtool_cmd_speed() / 1000;
> >                         break;
> >                 /*
> >                 }
> 
> I was thinking of something like:
> 
> 		u64 speed = ethtool_cmd_speed(&ecmd);
> 		if (speed < 1000 || speed == SPEED_UNKNOWN)
> 			return DEFAULT_PRB_RETIRE_TOV;
> 		msec = 1;
> 		div = speed / 1000;
> 
> Ben.
> 
> --
> Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer;
> that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.