linux-kernel - Re: [PATCH net-next v4 5/5] net: hdlc

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Date:   Fri, 30 Oct 2020 17:25:55 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Xie He <xie.he.0141@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Krzysztof Halasa <khc@...waw.pl>
Subject: Re: [PATCH net-next v4 5/5] net: hdlc_fr: Add support for any Ethertype

On Fri, Oct 30, 2020 at 3:29 PM Xie He <xie.he.0141@...il.com> wrote:
>
> On Fri, Oct 30, 2020 at 9:33 AM Willem de Bruijn
> <willemdebruijn.kernel@...il.com> wrote:
> >
> > Should this still check data[5] == FR_PAD?
>
> No, the 6th byte (data[5]) is not a padding field. It is the first
> byte of the SNAP header. The original code is misleading. That is part
> of the reasons why I want to fix it with this patch.

Oh, good point. In that case

Acked-by: Willem de Bruijn <willemb@...gle.com>

> The frame format is specified in RFC 2427
> (https://tools.ietf.org/html/rfc2427). We can see in Section 4.1 and
> 4.2 that the 6th byte is the first byte of the SNAP header.