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

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Date:	Mon, 25 Oct 2010 18:13:31 +0200
From:	Micha Nelissen <micha@...i.hopto.org>
To:	"Bounine, Alexandre" <Alexandre.Bounine@....com>
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

Bounine, Alexandre wrote:
> Micha Nelissen <micha@...i.hopto.org> wrote:
>>> rid of rswitch->switchid and use component_tag directly for
> switches).
>> I still prefer the destid as the single identification id.
> 
> In your patch you allocate individual destid for switches. This method
> has two problems:
> 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.

Micha
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