[openib-general] mapping between IP address and device name

[Hal Rosenstock]

On Thu, 2005-06-23 at 11:47, Roland Dreier wrote:
>     James> The IBAT API provides the two key services needed by kDAPL:
>     James> the ability to obtain a route based on an IP address and
>     James> the ability to map a GID to an IP address.
> 
>     James> Is there agreement that an IB address translation service
>     James> must provide these two services?
> 
> I think the first service is reasonable, although one has to be
> careful to design it so it works with things like IPv6 link-local
> addresses.  The second service, mapping a GID to an IP address,
> doesn't make sense to me: for a given GID, there may be no associated
> IPoIB address, or there may be many IPoIB addresses -- in fact, it is
> difficult to configure an IPoIB interface so that it doesn't have both
> IPv4 and IPv6 addresses.

In terms of mapping a GID to an IP address, the administrator can choose
whether to run IPoIB or not and how it is configured.

In the case of multiple addresses, the set of addresses is returned.
In the case of no associated addresses, then an error is returned. I

-- Hal