This series addresses several problems when shutting down a nvme-rdma
host when its controllers are attempting to reconnect to a target that
is no longer reachable.

To tickle these bugs:

1) attach over iw_cxgb4 to 10 devices on a target.
2) 'ifconfig down' the target's interface
3) wait for keep-alive to fire and begin reconnecting (~15-20 seconds)
4) do one of these on the host:
   - rmmod iw_cxgb4
   - reboot
   - reboot -f

Doug/Sagi, the first 2 iw_cxgb4 patches are included here because they're
needed for the testing.  While I've also submitted them to linux-rdma,
perhaps Sagi can merge them in nvmf-4.8-rc?  If that is acceptable
with everyone.

Fine with me,

Queued for the next round of rc fixes.

Thanks Steve!
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