[PATCH 4/6] Add multi mport support.
Matt Porter
mporter at kernel.crashing.org
Wed Feb 6 03:29:42 EST 2008
On Thu, Jan 31, 2008 at 02:30:13PM +0800, Zhang Wei wrote:
> > -----Original Message-----
> > From: Kumar Gala [mailto:galak at kernel.crashing.org]
> > when we have multiple ports are the device IDs on the ports intended
> > to be unique only to a port or unique across all ports?
> >
> I consider each RIO controller will has its own network, the device IDs
> should be
> unique only in its port network.
This is a bad assumption IMHO. It pushes policy on to the system
designer of a RapidIO network.
It is very possible to use multiple controllers as entry points
in a single RapidIO network fabric space. The reason one would do this
is to provide optimized paths to some endpoints in the system.
If possible, there should never be a policy assumption like this in
kernel space. It's much better to assume that one may or may not
have a unique id space.
-Matt
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