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Date:   Mon, 12 Oct 2020 18:46:47 -0700
From:   Xie He <>
To:     Cong Wang <>
Cc:     Linux Kernel Network Developers <>,
        syzbot <>,
        William Tu <>,
        Willem de Bruijn <>
Subject: Re: [Patch net v3] ip_gre: set dev->hard_header_len and
 dev->needed_headroom properly

On Mon, Oct 12, 2020 at 4:17 PM Cong Wang <> wrote:
> Note, there are some other suspicious use of dev->hard_header_len in
> the same file, but let's leave them to a separate patch if really
> needed.

I looked at the file (before this patch). There are 4 occurrences of
hard_header_len, but they are all for ERSPAN devices (TAP devices
which tunnel Ethernet frames). So I think they are used for the
Ethernet header length and we don't need to worry about them.

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