Support for multiple ethernet ports

[Thomas Doerfler]

Hi,

since nobody answered up to now, I will try to add my 2 cents 
of knowledge here...

> 
> 
> It appears from reading the RTEMS network supplement that RTEMS can
> supports multiple Ethernet ports.  For my application, I would like to
> configure RTEMS to support 3 Ethernet ports.

I have an application running with one ethernet port 
(MC68360), one local loopback interface, and one PPP 
interface, so from the protocol stack point of view this must 
be quite similar. RTEMS should definitely support multiple 
networking interfaces. 

The only difference to your application is, that you have a 
different device and possibly multiple devices of the same 
type. How do you distinguish the network interfaces on driver 
level? Maybe some part of the software doesn't work properly 
with an identical major number or so?

> 
> I have successfully configured RTEMS to use a single Ethernet port.  When
> I configure RTEMS to use two ports, part way through the initialization of
> the second port I get the following error:
> 
>     Can't set eth2 address: File exists
> 
> This error message is in rtems_glue.c at approximately line 828.  The call
> to ioctl (s, SIOCSIFADDR, &ifreq) returns with a failure.
> 
> Since RTEMS seems to support multiple Ethernet port, I am assuming that I
> have not correctly configured the building of RTEMS.  How do I configure
> RTEMS to support 3 Ethernet ports?

I don't think this is a building problem, possibly you should 
look for a problem in the code involved. I had a look into the 
"gen68360" networking driver, it does not distinguish between 
multiple devices, although the hardware would be capable to 
supply multiple ethernet interface. The same is true for the 
entries in the "netdriver_config" table. So have you created 
your own mechanism to distinguish multiple devices on 
driver/configuration level? Maybe you got a problem there?

Bye,
	Thomas.

> 
> 
> TIA
> Alex
> 
> -- 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Alex Holeczy (alex at wmi.com)
> 
> Communication Automation Corporation (CAC)      www.cacdsp.com www.wmi.com
> 1180 McDermott Drive, West Chester, PA  19380
> 
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