netdev - Re: [PATCH v4 net-next] net: ftmac100: support mtu

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Message-ID: <CABikg9xBT-CPhuwAiQm3KLf8PTsWRNztryPpeP2Xb6SFzXDO0A@mail.gmail.com>
Date:   Wed, 19 Oct 2022 21:36:21 +0300
From:   Sergei Antonov <saproj@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, andrew@...n.ch
Subject: Re: [PATCH v4 net-next] net: ftmac100: support mtu > 1500

On Wed, 19 Oct 2022 at 19:55, Vladimir Oltean <olteanv@...il.com> wrote:
>
> On Wed, Oct 19, 2022 at 07:20:58PM +0300, Sergei Antonov wrote:
> > The ftmac100 controller considers some packets FTL (frame
> > too long) and drops them. An example of a dropped packet:
> > 6 bytes - dst MAC
> > 6 bytes - src MAC
> > 2 bytes - EtherType IPv4 (0800)
> > 1504 bytes - IPv4 packet
>
> Why do you insist writing these confusing messages?

Yes, I see now it is not good. And I have a question.
By comparing the packet sent from the sending computer and the packet
received by ftmac100 I found that 4 bytes get appended to the packet:
80 02 00 00
I guess it is what 88E6060 switch adds. But it is not 0x8100. Then
what it is? I looked into include/linux/if_vlan.h but still don't get
it.