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54704b32b2
Add a regression test for DualPI2 GSO backlog accounting when it is used as a child qdisc of QFQ. The test sends one UDP GSO datagram through a QFQ class with DualPI2 as the leaf qdisc. DualPI2 splits the skb into two segments. After the traffic drains, both QFQ and DualPI2 must report zero backlog and zero qlen. On kernels with the broken accounting, QFQ can keep a stale non-zero qlen after all real packets have been dequeued. Signed-off-by: Xingquan Liu <b1n@b1n.io> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Link: https://patch.msgid.link/20260619151447.223640-2-b1n@b1n.io Signed-off-by: Jakub Kicinski <kuba@kernel.org>