linux-kernel - RE: [PATCH v2 09/10] RapidIO: Add support for IDT CPS Gen2 switches

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Date:	Wed, 15 Sep 2010 15:13:27 -0400
From:	"Anderson, Trevor" <tanderson@...tisswright.com>
To:	"Bounine, Alexandre" <Alexandre.Bounine@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Moll <thomas.moll@...go.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH v2 09/10] RapidIO: Add support for IDT CPS Gen2 switches



> -----Original Message-----
> From: Bounine, Alexandre [mailto:Alexandre.Bounine@....com]
> Sent: Wednesday, September 15, 2010 11:53 AM
> To: Anderson, Trevor; Andrew Morton
> Cc: linux-kernel@...r.kernel.org; Thomas Moll; linuxppc-dev@...ts.ozlabs.org
> Subject: RE: [PATCH v2 09/10] RapidIO: Add support for IDT CPS Gen2 switches
>
> Anderson, Trevor <tanderson@...tisswright.com> wrote:
> >
> > Keep it in please. We lurkers in the embedded community do use the
> per-port routing tables.
> > One of the problems with SRIO switch tables is that access to routes
> is not atomic; we can use
> > restricted access to per-port routing tables to reduce the risk of
> interference. And we still use
> > the Global table during enumeration.
> >
> Will it help if I add sysfs attribute(s) to handle per-port routes?

I don't think so - not from my perspective, at least. All of our routes
are programmed using the broadcast table; but we use the private tables
as a safer method of reading the routes that have been programmed, when we
need to know that.



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