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Add a test case for FQ_CODEL with DRR parent to verify packet drop behavior when the queue becomes empty. This helps ensure proper notification mechanisms between qdiscs. Note this is best-effort, it is hard to play with those parameters perfectly to always trigger ->qlen_notify(). Cc: Pedro Tammela <pctammela@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Link: https://patch.msgid.link/20250403211636.166257-5-xiyou.wangcong@gmail.com Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>