[ewg] broken support for UC in rdma_cm

[Eli Cohen]

On Mon, Mar 15, 2010 at 08:38:00AM -0700, Sean Hefty wrote:
> 
> This is really a new feature request, which I may not have time to address.  It
> depends on the scope of the changes that are needed.
> 
> If both sides try using UC QPs, do you know what specific setting causes the
> connection to fail?

The actual failure is to modify the QP from init to rtr since the
attribute mask sets IB_QP_MAX_DEST_RD_ATOMIC and IB_QP_MIN_RNR_TIMER
which are invalid attributes in UC. The flags are set in
cm_init_qp_rtr_attr() since the transport is IB_QPT_RC.