Re: [lwip-users] Getting started with an ethernet driver for linux

[A G]

Hi
Thanks, where you say it "uses a pseudo network interface that somehow passes 
raw ethernet packets", what do you mean by "somehow"; is this functionality 
provided by lwip, or do I need to do the lwip to raw ethernet packet interface?

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> Date: Tue, 18 Sep 2012 07:49:46 +0200
> From: address@hidden
> To: address@hidden
> Subject: Re: [lwip-users] Getting started with an ethernet driver for linux
>
> A G <address@hidden> wrote:
> > Hi
> > I am wanting to use lwip with ethernet in linux. In a previous message
> > here
> > http://lists.nongnu.org/archive/html/lwip-users/2007-03/msg00008.html
> > it says you would need to integrate the device drivers with lwip (in
> > ethernetif.c I presume).
> >
> > My device is an intel 82567 gigabit card and have downloaded the driver
> > source for linux from intel's website. Where should I start?
>
>
> lwIP under linux is most often only used from user space. This means that the 
> lwIP netif driver does not talk to your real hardware but uses a pseudo 
> network interface that somehow passes raw ethernet packets into the linux 
> network stack. The linux network stack in turn passes them to the hardware.
>
> This is not suited for embedded realtime applications, of course. If you 
> wanted that, you'd have to run lwIP either in kernel space or as a part of an 
> extra realtime kernel running below linux (so the linux kernel is like the 
> 'idle thread' of the realtime kernel). The ones I know are RTAI and RTLinux 
> and I think lwIP has been ported to both. However, to use lwIP with these 
> (for realtime communication), you might have to write a driver for your 
> PCI(e) network card, which won't be an easy thing to do.
>
>
> Simon
>
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