netdev - htb offload on vlan (mlx5)

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Date:   Fri, 3 Mar 2023 19:04:43 +0100
From:   Stanisław Czech <s.czech@...atel.com>
To:     netdev@...r.kernel.org
Cc:     Maxim Mikityanskiy <maximmi@...dia.com>
Subject: htb offload on vlan (mlx5)

Hi,

I'm trying to use htb offload on vlan interface using  ConnectX-6 card 
(01:00.0 Ethernet controller: Mellanox Technologies MT28908 Family 
[ConnectX-6])
but it seems there is no such a capability on the vlan interface?

On a physical interface:

ethtool -k eth0 | grep hw-tc-offload
hw-tc-offload: on

On a vlan:

ethtool -k eth0.4 | grep hw-tc-offload
hw-tc-offload: off [fixed]

so while there is no problem with:
tc qdisc replace dev eth0 root handle 1:0 htb offload default 2

I can't do:
tc qdisc replace dev eth0.4 root handle 1:0 htb offload default 2
Error: hw-tc-offload ethtool feature flag must be on.

modinfo mlx5_core
filename: 
/lib/modules/6.2.1-1.el9.elrepo.x86_64/kernel/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko.xz
license:        Dual BSD/GPL
description:    Mellanox 5th generation network adapters (ConnectX 
series) core driver
author:         Eli Cohen <eli@...lanox.com>
srcversion:     59FA0D4A4E95B726AB8900D

Is there a different way to use htb offload on the vlan interface?

Greetings,
*Stanisław Czech*