snull fix

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Author: DougWinterburndoug@winterburn.net
Date:  
Subject: snull fix
Tim,

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

   ----- The following addresses had permanent fatal errors -----
<>
    (reason: 550 Invalid recipient <>)
    (expanded from: <>)


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.