netdev - Re: [Query]: DSA Understanding

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Message-ID: <CA+V-a8s9z2=aXiXC-82_sGwsZwKW6Sk6F3=LDX8Uz6B0L_VUMw@mail.gmail.com>
Date:   Thu, 9 Aug 2018 12:33:30 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>
Subject: Re: [Query]: DSA Understanding

Hi Florain,

Thanks for your reply.

On Thu, Aug 2, 2018 at 5:24 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>
>
>
> On 08/02/2018 09:05 AM, Andrew Lunn wrote:
> >> I dont see any Reply's on the PC with tcpdump on PC
> >
> > So try ethool -S on the PC. Any packets dropped because of errors?
> >
> > Try turning off hardware checksums on the switch. ethtool -K.
>
> Also make sure that cpsw is properly sending 64 bytes (including FCS)
> packets to the switch, some switches will just discard packets when
> packets are RUNT

how can I dump the FCS from the switch (can I use tshark ?)

Cheers,
--Prabhakar Lad