netdev - Re: [PATCH net] dsa: mv88e6xxx: 6161: Use chip wide MAX MTU

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Message-ID: <YIdqRlY+2iSqQ8lW@lunn.ch>
Date:   Tue, 27 Apr 2021 03:35:02 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     曹煜 <cao88yu@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH net] dsa: mv88e6xxx: 6161: Use chip wide MAX MTU

On Tue, Apr 27, 2021 at 08:18:00AM +0800, 曹煜 wrote:
> Hi Andrew,
> I'll test the patch later, but what about the 88e6171r switch chip,
> this chip also got this issue since kernel 5.9.0 Many thanks.

Saying the 6171 is wrong i have problems with.

The 6161 is part of the 6165 family, consisting of 6123, 6161 and
6165. The 6123 was already using mv88e6185_g1_set_max_frame_size, and
the documentation is ambiguous.

The 6171 is part of the 6351 family: 6171 6175 6350 6351. It is a
couple of generations newer, and all the other members of the family
also use mv88e6165_port_set_jumbo_size. I have the GPL licensed SDK
from Marvell. If i'm reading the SDK correctly, it has a function to
access the per port register for jumbo settings for the 6351 family.

Do you have a 6171 we can test code on?

   Andrew