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[ Upstream commitb7a2c1fe6b] Introduce support for standardized PHY statistics reporting in ethtool by extending the PHYLIB framework. Add the functions phy_ethtool_get_phy_stats() and phy_ethtool_get_link_ext_stats() to provide a consistent interface for retrieving PHY-level and link-specific statistics. These functions are used within the ethtool implementation to avoid direct access to the phy_device structure outside of the PHYLIB framework. A new structure, ethtool_phy_stats, is introduced to standardize PHY statistics such as packet counts, byte counts, and error counters. Drivers are updated to include callbacks for retrieving PHY and link-specific statistics, ensuring values are explicitly set only for supported fields, initialized with ETHTOOL_STAT_NOT_SET to avoid ambiguity. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Stable-dep-of:637399bf7e("net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device") Signed-off-by: Sasha Levin <sashal@kernel.org>