Merge branch 'rdma-optional-stats' into next

Mark Zhang  says:

====================

This is supplementary part of kernel series [1], which provides an
extension to the rdma statistics tool that allows to set or list
optional counters dynamically, using netlink.

Thanks

[1] https://www.spinics.net/lists/linux-rdma/msg106283.html

====================

Signed-off-by: David Ahern <dsahern@kernel.org>