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@gmail.com wrote:

From: Willem de Bruijn willemb@google.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@google.com

Thanks Willem for upstreaming this test.

Reviewed-by: Eric Dumazet edumazet@google.com