Merge branch 'net-smc-preparations-for-SMC-R-link-failover'

Karsten Graul says:

====================
net/smc: preparations for SMC-R link failover

This patch series prepares the SMC code for the implementation of SMC-R link
failover capabilities which are still missing to reach full compliance with
RFC 7609.
The code changes are separated into 65 patches which together form the new
functionality. I tried to create meaningful patches which allow to follow the
implementation.

Question: how to handle the remaining 52 patches? All of them are needed for
link failover to work and should make it into the same merge window.
Can I send them all together?

The SMC-R implementation will transparently make use of the link failover
feature when matching RoCE devices are available, no special setup is required.
All RoCE devices with the same PNET ID as the TCP device (hardware-defined or
user-defined via the smc_pnet tool) are candidates to get used to form a link
in a link group. When at least 2 RoCE devices are available on both
communication endpoints then a symmetric link group is formed, meaning the link
group has 2 independent links. If one RoCE device goes down then all connections
on this link are moved to the surviving link. Upon recovery of the failing
device or availability of a new one, the symmetric link group will be restored.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>