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From:   Luiz Angelo Daros de Luca <luizluca@gmail.com>
Date:   Fri, 3 Nov 2023 14:13:27 -0300
Message-ID: <CAJq09z4YOgkTb5YYAyObR-dDihcy1oFh_UQXS+i29EHw0jJxXQ@mail.gmail.com>
Subject: Re: [PATCH net v2] net: dsa: tag_rtl4_a: Bump min packet size
To:     Vladimir Oltean <olteanv@gmail.com>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
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>
> Hi Luiz,
>
> On Wed, Nov 01, 2023 at 09:35:30AM -0300, Luiz Angelo Daros de Luca wrote:
> > Hi Linus,
> >
> > Sorry but I noticed no issues:
> >
> > From the router:
> >
> > No. Time Source Destination Protocol Length Info
> > 1 0.000000000 192.168.1.1 192.168.1.2 ICMP 1514 Echo (ping) request id=0x0789, seq=23/5888, ttl=64 (reply in 2)
> > 2 0.000040094 192.168.1.2 192.168.1.1 ICMP 1514 Echo (ping) reply id=0x0789, seq=23/5888, ttl=64 (request in 1)
> >
> > From the host:
> >
> > No. Time Source Destination Protocol Length Info
> > 1 0.000000000 192.168.1.2 192.168.1.1 ICMP 1514 Echo (ping) request id=0x0002, seq=8/2048, ttl=64 (reply in 2)
> > 2 0.000391800 192.168.1.1 192.168.1.2 ICMP 1514 Echo (ping) reply id=0x0002, seq=8/2048, ttl=64 (request in 1)
> >
> > If I go over that limit, it fragments the packet as expected.
>
> Could you run the shell command that sweeps over the entire range, fromhere?
> https://lore.kernel.org/netdev/20231030222035.oqos7v7sdq5u6mti@skbuf/

Sure. I might be able to run it on Monday. I'm away from the device
and it might have OOM. It has too little RAM to survive too much time
by itself. However, I doubt it might fail at a specific packet range
as it would hang an interactive SSH session quite easily.

Regards,

Luiz