linux-kernel - Re: [PATCH net] drivers/net/wan/lapbether: Added needed

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Message-ID: <CAJht_EM9q9u34LMAeYsYe5voZ54s3Z7OzxtvSomcF9a9wRvuCQ@mail.gmail.com>
Date:   Sun, 9 Aug 2020 10:11:39 -0700
From:   Xie He <xie.he.0141@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux X25 <linux-x25@...r.kernel.org>,
        Martin Schiller <ms@....tdt.de>
Subject: Re: [PATCH net] drivers/net/wan/lapbether: Added needed_tailroom

On Sun, Aug 9, 2020 at 1:48 AM Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> Does this solve an actual observed bug?
>
> In many ways lapbeth is similar to tunnel devices. This is not common.

Thank you for your comment!

This doesn't solve a bug observed by me. But I think this should be
necessary considering the logic of the code.

Using "grep", I found that there were indeed Ethernet drivers that set
needed_tailroom. I found it was set in these files:
    drivers/net/ethernet/sun/sunvnet.c
    drivers/net/ethernet/sun/ldmvsw.c
Setting needed_tailroom may be necessary for this driver to run those
Ethernet devices.