Re: [ECOS] Entry point of stack IP

[Birahim Larou Fall <BLFall at scmmicro dot fr>]

I use IP packets and arp also but at the low layer it's not an ethernet 
interface but TX/RX. I will spend more time to undestund how IP stack is 
interfaced with the network interface. If I find the entry point of the IP 
stack, I will be able to replace the ethernet drivers (eth_drv.c and 
harward driver) with my drivers.
Thanks!



Andrew Lunn <andrew@lunn.ch> 
Sent by: ecos-discuss-owner@ecos.sourceware.org
29/11/2005 11:15

To
Birahim Larou Fall <BLFall@scmmicro.fr>
cc
Andrew Lunn <andrew@lunn.ch>, eCos Discussion 
<ecos-discuss@ecos.sourceware.org>
Subject
Re: [ECOS] Entry point of stack IP






On Tue, Nov 29, 2005 at 10:15:28AM +0100, Birahim Larou Fall wrote:
> It is more like PPP/SLIP. The device is a modem (DOCSIS) used on 
numerical 
> TV. Data are transmitted from/to host  to/from to slave using DOCSIS 
modem 
> (TX/RX).  The host and the slave have each one a MAC and IP ADRESS.

If it has a MAC address then i sounds more like an ethernet than
PPP. Do you need ARP? Do you pass ethernet frames or IP packets? 

If your interface uses raw IP packets then it will plug in differently
than if it uses ethernet frames.

Basicaly, you want to take a look at the ethernet infrastructure in
packages/io/eth/current/src/net/eth_drv.c which goes between the
ethernet drivers and the bottom of the stack, and packages/net/ppp and
look at how it interfaces to the stack. I also think you will need to
spend some time getting familiar with the network stack.

        Andrew

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