linux-kernel - RE: [PATCH -mm 0/2] RapidIO: Changes to handling of RIO switches

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Message-ID: <0CE8B6BE3C4AD74AB97D9D29BD24E5520147D5C2@CORPEXCH1.na.ads.idt.com>
Date:	Mon, 25 Oct 2010 10:13:38 -0700
From:	"Bounine, Alexandre" <Alexandre.Bounine@....com>
To:	"Micha Nelissen" <micha@...i.hopto.org>
Cc:	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>,
	"Matt Porter" <mporter@...nel.crashing.org>,
	"Li Yang" <leoli@...escale.com>,
	"Kumar Gala" <galak@...nel.crashing.org>,
	"Thomas Moll" <thomas.moll@...go.com>
Subject: RE: [PATCH -mm 0/2] RapidIO: Changes to handling of RIO switches

Micha Nelissen <micha@...i.hopto.org> wrote:
> 
> Bounine, Alexandre wrote:
> > 1. The destid for the switch needs an additional mechanism to share
it
> > among processors in the RIO network,
> 
> ? See comment for 2)
> 
> > 2. It takes ID value away from the pool of available IDs, what will
> 
> It does not take an ID away, it shares it with a connected endpoint to
> that switch. The tag uses one extra bit to identify the device as a
> switch instead of an endpoint. This provides the information to
> unambiguously identify a switch from an endpoint.

OK taking away #2. But do not see how it justifies storing two values of
destid.

And you have just confirmed using CT for unique identification. We
simply have differences in interpretation of CT: you are using component
tag to pass unique identification and I am using CT as a unique
identification. I prefer not to assume any relationship between routing
information and the component tag.

Alex.


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