netdev - Re: [PATCH RFC] net: vlan: reverse 4 bytes of vlan header when setting initial MTU

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Message-ID: <3c79d203-33e9-11dc-939d-3cecd707eb40@gmail.com>
Date:   Mon, 21 Oct 2019 20:47:17 -0600
From:   David Ahern <dsahern@...il.com>
To:     Yunsheng Lin <linyunsheng@...wei.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     davem@...emloft.net, jiri@...lanox.com, allison@...utok.net,
        mmanning@...tta.att-mail.com, petrm@...lanox.com,
        dcaratti@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] net: vlan: reverse 4 bytes of vlan header when
 setting initial MTU

On 10/21/19 7:31 PM, Yunsheng Lin wrote:
> Or we just leave it as it is, and expect user to manually configure the MTU
> of vlan netdev to the MTU of thelower device minus vlan header when the
> performace in the above case is a concern to user?
> 

for now, I would think so. vlan on a vxlan device ... you are going
after q-in-q'ish with vxlan? that can not be a common deployment.