snull fix

[Doug Winterburn]

Tim,

Much appreciate your discovery.  Works for me also.  Tried emailing you,
but got:

   ----- The following addresses had permanent fatal errors -----
<wilson@mediaone.net>
    (reason: 550 Invalid recipient <wilson@mediaone.net>)
    (expanded from: <wilson@mediaone.net>)

Thanks much,

-Doug

Tim Wilson wrote:
> 
> I a question about snull  (from Doug Winterburn) on this mailing list
> back in December. I  just figured out how to make it work under 2.2 and
> I thought you might want to know. BTW, snull is a sample program in
> Rubini's device drivers book.
> 
> The key thing is to set skb->pkt_type in  snull_rx, before calling
> netif_rx:
> 
>     /* Write metadata, and then pass to the receive level */
>     skb->dev = dev;
>     skb->protocol = eth_type_trans(skb, dev);
>     skb->ip_summed = CHECKSUM_UNNECESSARY;
> 
>     // YOU MUST SET THIS!
>     // This is the thing that makes it work under 2.2
>     skb->pkt_type = PACKET_HOST;
> 
> There's a couple of other tweaks required to get it to compile but I
> assume you know about these since you did compile it.