[openib-general] ib_mad shutdown WC status code ?

[Dror Goldenberg]

> -----Original Message-----
> From: Sean Hefty [mailto:mshefty at ichips.intel.com] 
> Sent: Friday, September 24, 2004 6:41 PM

> I think that flushed makes sense.  With queuing in the access 
> layer, we should be able to stop and restart the QP in most 
> error cases without affecting the user.  If the link goes 
> down, flushing the requests seems reasonable.  What other 
> cases would cause the MAD layer to shut down?
> 

If link goes down, UD QP will go on "sending" the packets as
if link was up all the time. You wouldn't get flushed WQEs in this
case for a UD QP.
In general, for UD QPs, you'll get flushed WQEs when the QP
moves to the error state and that seldom happens. The exact
scenarios for this to happen (hopefully I don't miss anything):
- s/g element points at a wrong address/protection error
- HCA can't fetch a WQE (e.g. bus error)

-Dror

> - Sean
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