Re: [PATCH] ibsim: support LID portions of directed-route SMPs

[Rolf Manderscheid <rvm-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

Hi Alex,
> route_MAD() breaks the LID route support.

I think the change to route_MAD() is sound, there's no change in
behaviour for LID-routed packets.  The path argument is expected to be
NULL in the case of a LID routed MAD, which causes an early
return, but this is only an optimization.  Even if you forget to pass
in a NULL path (which I did in one case as you pointed out!), the
path->cnt will be zero for LID routed MADs which causes the
direct_route_*_MAD() functions to just return the same port that was
passed in, so it works either way.  I tested this with some simple
topologies, running opensm and then doing a perfquery to each
simulated node.  I also used python-rdma with a new python simulator
client which is the motivation for this patch.  Without this change,
python-rdma exposes the missing handling of leading and/or trailing LIDs
in directed-route SMPs.  I'll send an updated patch which passes a
NULL path for LID-routed packets at the second call site.

     Rolf
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