[openib-general] Using TopSpin CM in a VAPI application

Wed Apr 28 14:15:02 PDT 2004

Chanan -- thanks for the patch.  However, I don't like this approach:
I think it puts too much Mellanox HCA dependency in the core IB code.
It also creates a whole new operation for registering a VAPI kernel
handle; however, in the long run we want to move to a single cleaned
up verbs API, so I don't think it makes sense to do this.

What do you think of the attached patch (against the current svn tree
from https://openib.org/svn/gen1/trunk)?

The way to use it is to make a tTS_IB_TAVOR_QP_CREATE_PARAM_STRUCT
with is_user=0, vapi_handle set to the VAPI_qp_hndl_t, and qpn and
qp_state set correctly.  Then call ib_qp_create with the
device_specific pointer pointing at this structure.  This will give
you back a struct ib_qp * that you can pass to the CM, etc.  When you
are done with the QP, destroy it with ib_qp_destroy(); the VAPI
function on the underlying VAPI_qp_hndl_t will be called
automatically.

The code in core/useraccess_cm.c is a reasonable example, although it
is registering a userspace QP (so there are slight differences).

 - Roland

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