netdev - question: ip forwarding and fq/mq qdisc

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Date:   Fri, 14 Dec 2018 15:02:10 +0300
From:   Sergey Matyukevich <geomatsi@...il.com>
To:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        sergey.matyukevich.os@...ntenna.com
Subject: question: ip forwarding and fq/mq qdisc

Hi all,

I have been running 4.18-rc8 kernel with enabled IP forwarding between
wired and wireless interfaces, where both interfaces
were configured as fq qdisc.

However after moving to 4.20-rc1 kernel the same configuration does not
work anymore: pass-through packets are not forwarded in both directions.
Forwarding starts working again only if I change qdisc of _both_ interfaces
to anything but fq/mq. For instance any combination of pfifo/fq_codel/noqueue
works fine.

Does it look like a regression or it is a known change in behavior ?

Regards,
Sergey