[openib-general] Re: problem with SDP/AIO on mem-free HCA

[Roland Dreier]

    Fab> If you are blessed with a Tavor PRM, see section 8.2.1.6 (in
    Fab> PRM 1.0.0).  It states that a length of zero in a data
    Fab> segment indicates a 2GB transfer (MSb is used as a flag to
    Fab> indicate normal vs. inline data segments).  A zero-byte
    Fab> request must not reference any data segments.

Yup, that must be the problem.  I guess mthca can skip over 0-length
data segments.  Another option would be to say that such work requests
aren't allowed.  Not sure which way I think we should go.  I need to
talk to Libor and find out why SDP is generating such requests.

 - R.