Re: [net-next PATCH RFC] net: dsa: qca8k: make learning configurable and keep off if standalone

[Vladimir Oltean]

On Wed, Jun 28, 2023 at 02:53:35AM +0200, Christian Marangi wrote:
> Also sorry for the double email... I forgot to add that it seems I need
> to add a sleep 1 right after 
> 
> 	mc_route_prepare $h1
> 	mc_route_prepare $rcv_if_name
> 
> in local_termination.sh. Think the switch needs some time to enable all
> the port. Without the sleep 1 the first test just fails.

This makes sense. Those multicast MAC addresses are synced to DSA
through dsa_slave_set_rx_mode() -> dsa_slave_sync_mc(). Notice that the
calling context is atomic, so the implementation sets up a deferred work
item for later. So user space is allowed to return from the syscall
before the hardware is actually reprogrammed.