netdev - RE: [PATCH v2 1/1] net/macb: add TX multiqueue support for gem

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Date:	Fri, 12 Dec 2014 09:59:36 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Cyrille Pitchen' <cyrille.pitchen@...el.com>,
	'Thomas Petazzoni' <thomas.petazzoni@...e-electrons.com>
CC:	"nicolas.ferre@...el.com" <nicolas.ferre@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"soren.brinkmann@...inx.com" <soren.brinkmann@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 1/1] net/macb: add TX multiqueue support for gem

From: Cyrille Pitchen [...
> > It will probably add a lot of object code and, depending on how often
> > the registers are accesses, might have performance impact.
> >
> > Having:
> > #define GEM_ISR(n) (0x400 + (n) << 4)
> > will save source code.
> >
> > 	David
> >
> >
> >
> So you suggest that we keep the unsigned int fields ISR, IMR, IER, IDR, TBQP in
> the struct macb_queue and initialize them once for all in macb_probe() like
> patch v2 does but only replace the GEM_ISR1 .. GEM_ISR7 defines by GEM_ISR(n)
> in macb.h?
> 
> This way there would be to test at run time and we can handle the special
> register mapping of queue0.
> 
> Is it what you meant?

In one word, yes.

	David



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