Merge branch 'net-ethtool-add-dedicated-grxrings-driver-callbacks'

Breno Leitao says:

====================
net: ethtool: add dedicated GRXRINGS driver callbacks

This patchset introduces a new dedicated ethtool_ops callback,
.get_rx_ring_count, which enables drivers to provide the number of RX
rings directly, improving efficiency and clarity in RX ring queries and
RSS configuration.

Number of drivers implements .get_rxnfc callback just to report the ring
count, so, having a proper callback makes sense and simplify .get_rxnfc
(in some cases remove it completely).

This has been suggested by Jakub, and follow the same idea as RXFH
driver callbacks [1].

This also port virtio_net to this new callback. Once there is consensus
on this approach, I can start moving the drivers to this new callback.

Link: https://lore.kernel.org/all/20250611145949.2674086-1-kuba@kernel.org/
v3: https://lore.kernel.org/20250915-gxrings-v3-0-bfd717dbcaad@debian.org
v2: https://lore.kernel.org/20250912-gxrings-v2-0-3c7a60bbeebf@debian.org
v1: https://lore.kernel.org/20250909-gxrings-v1-0-634282f06a54@debian.org
RFC: https://lore.kernel.org/20250905-gxrings-v1-0-984fc471f28f@debian.org
====================

Link: https://patch.msgid.link/20250917-gxrings-v4-0-dae520e2e1cb@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>