Does MultiCast receive work?

Does MultiCast receive work?

[Peter Dennett]

I am starting to add multicast support to the lancepci (VMWare) eth driver.
Sending works fine as it is just UDP sendto - I see the packets on a
neighboring LINUX box.  

I have made a first attempt to configure the adapter to receive MC
addresses.  For now I am just setting all 64 mask bits to one to allow all
MC addresses - this seems to be common in eCos eth drivers anyway.  So far I
am not seeing packets back to my application. From my debug code in
lancepci_recv I think the hardware is delivering them and I am passing them
up the stack.

Before I bust my hump too much more I wanted to see if anyone had a warm
fuzzy feeling about multicast on eCos?   Is it known to work?

Is there was any wise advice about how to proceed?

Peter Dennett       Office: 281 334 3800
www.padsoft.com       Cell: 713 899 6100
 

Re: Does MultiCast receive work?

[Gary Thomas]

Peter Dennett wrote:
> I am starting to add multicast support to the lancepci (VMWare) eth driver.
> Sending works fine as it is just UDP sendto - I see the packets on a
> neighboring LINUX box.  
> 
> I have made a first attempt to configure the adapter to receive MC
> addresses.  For now I am just setting all 64 mask bits to one to allow all
> MC addresses - this seems to be common in eCos eth drivers anyway.  So far I
> am not seeing packets back to my application. From my debug code in
> lancepci_recv I think the hardware is delivering them and I am passing them
> up the stack.
> 
> Before I bust my hump too much more I wanted to see if anyone had a warm
> fuzzy feeling about multicast on eCos?   Is it known to work?

Yes, it should work as IPv6 support requires it to function.

> Is there was any wise advice about how to proceed?

I'm afraid you'll have to do this just like we would - start up the
chain inside the stack and see where things go.  Start with the
packet received function:
   .../net/bsd_tcpip/current/src/sys/net/if_ethersubr.c:ether_input

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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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