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This test reproduces a scenario where HFSC queue length and backlog accounting can become inconsistent when a peek operation triggers a dequeue and possible drop before the parent qdisc updates its counters. The test sets up a DRR root qdisc with an HFSC class, netem, and blackhole children, and uses Scapy to inject a packet. It helps to verify that HFSC correctly tracks qlen and backlog even when packets are dropped during peek-induced dequeue. Cc: Mingi Cho <mincho@theori.io> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20250518222038.58538-3-xiyou.wangcong@gmail.com Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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