On Wed, Jan 13, 2021 at 05:41:38PM +0200, Vladimir Oltean wrote:
> From: Vladimir Oltean <[email protected]>
>
> In Time Sensitive Networking it is a common and simple use case to
> configure switches to give all traffic from an attached station the same
> priority, without requiring those stations to use VLAN PCP or IP DSCP to
> signal the priority that they want. Many pieces of hardware support this
> feature via a port-based default priority. We can model this in Linux
> through a matchall action on the ingress qdisc of the port, plus a
> skbedit priority action with the desired priority.
The mv88e6xxx has something similar. There is a bit to enable this
feature, as well as the priority the feature should have. I think that
then takes a value in the range of 0 to 4, but i could be remembering
it wrongly.
> + int (*port_priority_set)(struct dsa_switch *ds, int port,
> + struct dsa_mall_skbedit_tc_entry *skbedit);
The fact we can turn this on/off suggests there should be a way to
disable this in the hardware, when the matchall is removed. I don't
see any such remove support in this patch.
Andrew
