Merge branch 'net-smc-extent-buffer-mapping-and-port-handling'

Karsten Graul says:

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net/smc: extent buffer mapping and port handling

Add functionality to map/unmap and register/unregister memory buffers for
specific SMC-R links and for the whole link group. Prepare LLC layer messages
for the support of multiple links and extent the processing of adapter events.
And add further small preparations needed for the SMC-R failover support.
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Signed-off-by: David S. Miller <davem@davemloft.net>