Re: ethernet device xmit function is not gettting called

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On Mon, 28 Jun 2004 20:21:59 +0530 (IST)
<ravivsn@www.rocsys.com> wrote:

> 
> Hi,
>  I wrote a module to create dummy ethernet device, the intention is to
> add it to a bridge and transmit modified packets. I get ethernet device
> created but its xmit function is not called when the bridge receives a
> packet.

The interface has to go through the Spanning Tree Protocol (STP) initialization
process to get into the forwarding state which takes a while
(and it has to be marked up).  Use 'brctl showstp br0' to see.

> I feel I have missed some information to register netdevice.
> 
> To add to bridge I did the following:
> brctl addbr br0
> brctl addif bro eth0
Typo, I assume you mean br0

> brctl addif br0 firsteth0
> ifconfig etho 0.0.0.0
Another typo. eth0

> ifconfig bro 172.16.2.100 up
> 
> When I try to add IP address to firsteth0, I get a kernel panic!!

Well since bridging is at the link, not network layer you shouldn't do that.
If it panic's send the console log (backtrace) and it will get fixed.

> Can we give IP to dummy ethernet device?

No, bridging is at layer 2 not layer 3. See the FAQ at http://bridge.sourceforge.net

> 
> Please help, I am given little time to complete this :( I am attaching
> the code for the dummy ethernet device.

How is this different from the existing dummy device which works fine
in a bridge?

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