Merge branch 'Expose-port-split-attributes'

Ido Schimmel says:

====================
Expose port split attributes

Danielle says:

Currently, user space has no way of knowing if a port can be split and
into how many ports. Among other things, this makes it impossible to
write generic tests for port split functionality.

Therefore, this set exposes two new devlink port attributes to user
space: Number of lanes and whether the port can be split or not.

Patch set overview:

Patches #1-#4 cleanup 'struct devlink_port_attrs' and reduce the number
of parameters passed between drivers and devlink via
devlink_port_attrs_set()

Patch #5 adds devlink port lanes attributes

Patches #6-#7 add devlink port splittable attribute

Patch #8 exploits the fact that devlink is now aware of port's number of
lanes and whether the port can be split or not and moves some checks
from drivers to devlink

Patch #9 adds a port split test

Changes since v2:
* Remove some local variables from patch #3
* Reword function description in patch #5
* Fix a bug in patch #8
* Add a test for the splittable attribute in patch #9

Changes since v1:
* Rename 'width' attribute to 'lanes'
* Add 'splittable' attribute
* Move checks from drivers to devlink
====================

Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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