nvme-fabrics: crash at nvme connect-all

[Steve Wise]

> > Steve, did you see this before? I'm wandering if we need some sort
> > of logic handling with resource limitation in iWARP (global mrs pool...)
> 
> Haven't seen this.  Does 'cat /sys/kernel/debug/iw_cxgb4/blah/stats' show
> anything interesting?  Where/why is it crashing?
> 

So this is the failure:

[  703.239462] rdma_rw_init_mrs: failed to allocated 128 MRs
[  703.239498] failed to init MR pool ret= -12
[  703.239541] nvmet_rdma: failed to create_qp ret= -12
[  703.239582] nvmet_rdma: nvmet_rdma_alloc_queue: creating RDMA queue failed
(-12).

Not sure why it would fail.  I would think my setup would be allocating more
given I have 16 cores on the host and target.  The debugfs "stats" file I
mentioned above should show us something if we're running out of adapter
resources for MR or PBL records.  

Can you please turn on c4iw_debug and send me the debug output?  echo 1 >
/sys/module/iw_cxgb4/parameters/c4iw_debug.

Thanks,

Steve.