Tue, Nov 22, 2016 at 06:48:29PM CET, andrew@lunn.ch wrote:

Hi Ido

quoted

First of all, I want to be sure that when we say "CPU port", we're
talking about the same thing. In mlxsw, the CPU port is a pipe between
the device and the host, through which all packets trapped to the host
go through. So, when a packet is trapped, the driver reads its Rx
descriptor, checks through which port it ingressed, resolves its netdev,
sets skb->dev accordingly and injects it to the Rx path via
netif_receive_skb(). The CPU port itself isn't represented using a
netdev.

With DSA, we have a real physical ethernet network interface for the
'cpu' port. It connects to one of the ports of the switch. Frames on

Every port should be visible as a netdevice, including cpu port.
Would it make sence to have representors for those?

this interface have an extra header, indicating which switch port it
came from, and we do a similar resolving it to a slave netdev, strip
of the header and injecting it into the receiver path via
netif_receive_skb().

Andrew