[openib-general] mthca and DDR not hidden

[Roland Dreier]

    Sean> I need to reread through this mail thread, because I do not
    Sean> understand what the issue is yet.  What is a client of the
    Sean> MAD API missing in order to post to the QP?

To post a send to a special QP through ib_send_wr, you need an AH to
specify the destination, and each gather entry must have an L_Key.
The underlying QP, the AH, and the MR for the L_Key all must be
attached to the same PD, which means that the consumer must use the PD
that the MAD layer used to create the QP to create its AH.  Also, the
consumer must either create its own MR using that PD, or have access
to at least the L_Key for the MAD layer's MR.

 - R.