netdev - Re: [Patch net 2/2] selftests/tc-testing: Add an HFSC qlen accounting test

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Message-ID: <20250521091859.GV365796@horms.kernel.org>
Date: Wed, 21 May 2025 10:18:59 +0100
From: Simon Horman <horms@...nel.org>
To: Cong Wang <xiyou.wangcong@...il.com>
Cc: netdev@...r.kernel.org, jiri@...nulli.us, jhs@...atatu.com,
	Mingi Cho <mincho@...ori.io>
Subject: Re: [Patch net 2/2] selftests/tc-testing: Add an HFSC qlen
 accounting test

On Sun, May 18, 2025 at 03:20:38PM -0700, Cong Wang wrote:
> 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@...ori.io>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Reviewed-by: Simon Horman <horms@...nel.org>