netdev - Re: [Patch net v2] mlx5: fixup checksum for short ethernet frame padding

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Message-ID: <CANn89iJC6CimzRCTP0gfJMVvh_JVoQ9duXsEMo0MOzoEnU9=1A@mail.gmail.com>
Date:   Wed, 28 Nov 2018 16:07:42 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [Patch net v2] mlx5: fixup checksum for short ethernet frame padding

On Wed, Nov 28, 2018 at 3:57 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
> But again, I kinda feel the hardware already does the sanity check,
> otherwise we have much more serious trouble in mlx5e_lro_update_hdr()
> which parses into TCP header.
>

LRO is a different beast.

For packets that are not recognized as LRO candidates
(for example because their IP length is bigger than the frame length),
we exactly take the code path you want to change.

A NIC is supposed to deliver frames, even the ones that 'seem' bad.