netdev - Re: [PATCH net-next] selftests: net: verify fq per-band packet limit

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Date: Mon, 20 Nov 2023 10:12:20 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org, 
	pabeni@...hat.com, linux-kselftest@...r.kernel.org, 
	Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next] selftests: net: verify fq per-band packet limit

On Thu, Nov 16, 2023 at 9:34 PM Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> From: Willem de Bruijn <willemb@...gle.com>
>
> Commit 29f834aa326e ("net_sched: sch_fq: add 3 bands and WRR
> scheduling") introduces multiple traffic bands, and per-band maximum
> packet count.
>
> Per-band limits ensures that packets in one class cannot fill the
> entire qdisc and so cause DoS to the traffic in the other classes.
>
> Verify this behavior:
>   1. set the limit to 10 per band
>   2. send 20 pkts on band A: verify that 10 are queued, 10 dropped
>   3. send 20 pkts on band A: verify that  0 are queued, 20 dropped
>   4. send 20 pkts on band B: verify that 10 are queued, 10 dropped
>
>

...

> Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> ---

Thanks Willem for upstreaming this test.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>