netdev - packet stats validation

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Message-ID: <YgYixOmTSI7jxALK@pengutronix.de>
Date:   Fri, 11 Feb 2022 09:48:04 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     netdev@...r.kernel.org
Subject: packet stats validation

Hi all,

I'm implementing stats64 for the ksz switch and by validating my
implementation found different by count methods in different sub
systems. For example, i send 64 byte packet with:

mausezahn enp1s0f3 -c 1 -a rand -p 64

- tshark is recognizing 64 byte frame with 50 byte data
- Intel igb is counting it as 64 byte
- ksz9477 switch HW counter is counting it as 68 bytes packet
- linux bridge is counting it as 50 byte packet

Can you please help me to understand this differences?
Do linux bridge is doing it correct or it is a bug?
ksz9477 is probably adding a tag and counting tagged packets. Should
this number be provided to stats64?

Regards,
Oleksij
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