mlx4_core: Check firmware command interface revision
HCA firmware with incompatible changes to the FW commmand interface is
coming soon. Add a check of the interface revision during
initialization and bail out if the firmware advertises a revision that
the driver doesn't know about. This will avoid strange failures later
if the driver goes on using the wrong interface revision.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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