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Date:   Tue, 6 Feb 2018 17:12:49 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     <avagin@...nvz.org>, <kuznet@...tuozzo.com>, <kaber@...sh.net>,
        <makita.toshiaki@....ntt.co.jp>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>
Subject: Potential display issue with 88997e4208ae "net/8021q: create device
 with all possible features in wanted_features"

Hi, all

During testing, below cmd is used to add a vlan dev.
vconfig add eth0 1000

Without the commit 88997e4208ae(I revert the patch in the
latest net-next)

ethtool -k eth0 | grep rx-checksumming
rx-checksumming: on

ethtool -k eth0.1000 | grep rx-checksumming
rx-checksumming: on [fixed]

ethtool -K eth0 rx off

ethtool -k eth0 | grep rx-checksumming
rx-checksumming: off

ethtool -k eth0.1000 | grep rx-checksumming
rx-checksumming: off [fixed]

-----------------------------------------

With the commit 88997e4208ae

ethtool -k eth0 | grep rx-checksumming
rx-checksumming: on

ethtool -k eth0.1000 | grep rx-checksumming
rx-checksumming: off [fixed]

ethtool -K eth0 rx off

ethtool -k eth0 | grep rx-checksumming
rx-checksumming: off

ethtool -k eth0.1000 | grep rx-checksumming
rx-checksumming: off [fixed]


So the vlan dev' rx-csum feature is not changed automatically
according to the lower dev' rx-csum feature after commit 88997e4208ae.

Is this a display issue? And Do we need to fix this issue?

MBR,
Yunsheng Lin


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