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The NETC switch does not age out dynamic FDB entries automatically. Without software management, stale entries persist after topology changes and cause incorrect forwarding. Add a delayed work that periodically removes entries that have not been refreshed within the specified cycles. The effective ageing time is: ageing_time = fdbt_ageing_delay * 100 Default values are 3s interval and 100 cycles (300s total), matching the IEEE 802.1Q default ageing time. The work starts when the first port joins a bridge (tracked via br_cnt) and is cancelled when the last port leaves. All FDB operations are serialized under fdbt_lock. Implement .set_ageing_time() to allow the bridge layer to reconfigure ageing parameters on demand. Signed-off-by: Wei Fang <wei.fang@nxp.com> Link: https://patch.msgid.link/20260611021458.2629145-10-wei.fang@oss.nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>