Fwd: Re: [openib-general] static LID computation with TS_HOST_DRIVER

[David M. Brean]

Ok.  How does the port inform the SM that it has a "preferred" LID?

-David

Roland Dreier wrote:

>    David> 1) assignment of the IP address to the platform ethernet
>    David> during boot has nothing to do with LID assignment.  [If it
>    David> does, why is there a relationship?]
>
>Using the first IP address we can find was a quick-and-dirty way to
>pick a LID that would probably be unique among different hosts.
>
>    David> 2) in the version of the software Tom is using, the
>    David> ib_mthca driver will pick a LID if it doesn't find an IB
>    David> port in the ACTIVE (or ARMED) state.  This is a hack and
>    David> Roland has removed the hack from the latest version of the
>    David> software.
>
>Actually mthca had nothing to do with the LID assignment.  It was done
>by the MAD layer in device-independent code before it starts
>processing MADs.  This means it always happens, since the port cannot
>possibly be active without processing SMPs.
>
>    David> If both (1) and (2) are true, is there still a plan to
>    David> implement a mechanism where the applications can create
>    David> connections before the SM assigns a LID and brings the port
>    David> up to ACTIVE state?  [I hope the response is "no".]
>
>I guess it depends on whether supporting applications that want to do
>this becomes important or not.
>
>Thanks,
>  Roland
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