Merge branch 'smc-fixes'

Ursula Braun says:

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net/smc: fixes 2018-03-14

here are smc changes for the net-next tree.
The first patch enables SMC to work with mlx5-RoCE-devices.
Patches 2 and 3 deal with link group freeing.
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Signed-off-by: David S. Miller <davem@davemloft.net>