Re: [Linuxptp-users] Xilinx Ethernet Lite does not support multicast packets

[Richard C. <ric...@gm...>]

On Tue, Mar 19, 2013 at 03:07:03PM +0100, nicolas lantz wrote:
> 
> "Xilinx Ethernet Lite"  is marked as supporting PHY (and other)
> timestamping in the Driver Support Matrix.
> But according to data-sheet : "The Ethernet Lite MAC core does not
> support multicast packets."

Maybe they mean that there is no multicast filtering. I expect, at the
very least, you should be able to run in promiscuous mode.
 
> I try to get it working with a DP83640 PHY since three weeks, but
> without multicast support I now wonder how this would be possible.
> But why the emaclite drivers implements "skb_defer_rx_timestamp(skb)"
> function in the "xemaclite_rx_handler()" and
> "skb_tx_timestamp(new_skb)"  in   the "xemaclite_send" (
> .ndo_start_xmit) if it could not be usable ?
> there is something I've missed ?

I added the hooks to this MAC driver because it makes use of phylib,
and it therefore can support a time stamping PHY. However, I never
testing this, since I don't have access to this hardware.

Anyhow, I would be surprised if the MAC prevents you sending and
receiving multicast packets.

HTH,
Richard