[ofa-general] ehca_mrmw patch

[Kyle Schochenmaier]

With the memory registration restrictions of the eHCA coupled with our 
applications which require large memory registrations, we've found that 
we can quickly trigger a case where ibv_reg_mr()  will return -EINVAL, 
when it should be returning -ENOMEM.  If we were able to differentiate 
this type of error from the default -EINVAL, we would be able to handle 
this in userspace by flushing cached entries and retrying the memory 
registration.

I've attached a patch to start the process, if there are other paths 
back to userspace that can return ENOMEM on a resource limitation we 
should also add that.

thanks,

Kyle



-- 
Kyle Schochenmaier
kschoche at scl.ameslab.gov
Research Assistant, Dr. Brett Bode
AmesLab - US Dept.Energy
Scalable Computing Laboratory 

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