From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sergey Matyukevich <geomatsi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: question: ip forwarding and fq/mq qdisc
Date: Fri, 14 Dec 2018 15:02:10 +0300
Message-ID: <20181214120210.kmeuwvajuiwlp2n7@bars>
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Cc: Jamal Hadi Salim <jhs-jkUAjuhPggJWk0Htik3J/w@public.gmane.org>,
        Cong Wang <xiyou.wangcong-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
        Jiri Pirko <jiri-rHqAuBHg3fBzbRFIqnYvSA@public.gmane.org>,
        sergey.matyukevich.os-P/7pdk10T0iB+jHODAdFcQ@public.gmane.org
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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