linux-kernel - Re: [PATCH net v2] net: dsa: tag_rtl4

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Message-ID: <0d4cd98f-6f5f-4fc3-b55d-c1351054b667@gmail.com>
Date:   Mon, 30 Oct 2023 20:37:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: dsa: tag_rtl4_a: Bump min packet size



On 10/30/2023 5:37 PM, Andrew Lunn wrote:
> On Tue, Oct 31, 2023 at 01:09:06AM +0200, Vladimir Oltean wrote:
>> On Mon, Oct 30, 2023 at 11:57:33PM +0100, Linus Walleij wrote:
>>> This of course make no sense, since the padding function should do nothing
>>> when the packet is bigger than 60 bytes.
>>
>> Indeed, this of course makes no sense. Ping doesn't work, or ARP doesn't
>> work? Could you add a static ARP entry for the 192.168.1.137 IP address?
> 
> Probably the ARP, since they are short packets and probably need the
> padding.

Does this also mean that there is a general problem with unicast 
packets, and that broadcast packets happen to work by accident? Could 
you check whether a broadcast ping (ping -b) size sweep is immune to 
what you are reporting?
-- 
Florian