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This patch adds support for handling MACsec PN rollover in the mscc PHY driver. When a flow rolls over, an interrupt is fired. This patch adds the logic to check all flows and identify the one rolling over in the handle_interrupt PHY helper, then disables the flow and report the event to the MACsec core. Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net>