netdev - tc mqprio offload command error

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Date:   Mon, 16 Jul 2018 01:30:59 +0000
From:   "Chopra, Manish" <Manish.Chopra@...ium.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        David Miller <davem@...emloft.net>,
        Jiri Pirko <jiri@...nulli.us>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: tc mqprio offload command error

Hello Folks,

I am trying to set below command to try mqprio offload on 4.18 kernel. It is throwing the flowing error.

# tc qdisc add dev eth0 root mqprio num_tc 2 map 1 1 1 1 0 0 0 0
RTNETLINK answers: Numerical result out of range

I can't really make out what's wrong with the above command, since this works fine with other OS kernels.
Any thoughts if it is something broken on upstream kernel ?

Thanks,
Manish