Re: [RFC PATCH 0/8] xilinx: tsn: Add TSN Endpoint Ethernet MAC driver support

[Andrew Lunn]

On Fri, Feb 20, 2026 at 12:59:16PM +0000, Neeli, Srinivas wrote:
> [AMD Official Use Only - AMD Internal Distribution Only]

Sorry, i'm not part of AMD...

> > So how does the host send a frame out Port 2? Is there an extra header
> > on the frame sent by EndPoint, which the switch interprets?
> >
> 

> In this RFC, I configured all switch ports in forward mode. As a
> result, when a frame is sent from the internal endpoint, it is
> flooded to both external ports.  To forward packets to a specific
> port instead of flooding, either static switch CAM entries need to
> be configured or address learning should be enabled so the switch
> can learn CAM entries dynamically.

Despite not being part of AMD, this part is important.

I don't care about how the RFC works, i want to know how the hardware
works, to ensure you have the correct choice of DSA vs pure switchdev.

Take the example of running Spanning Tree Protocol. The bridge needs
to send the BPDU out a specific port. What mechanism is used to do
that? It also needs to know which port a BPDU ingressed.

	Andrew