Re: [PATCH net-next 0/2] net: dsa: mv88e6xxx: add support for dcb pcp app

[Luke Howard]

> On 4 Jun 2026, at 6:30 pm, Cedric Jehasse via B4 Relay <devnull+cedric.jehasse.luminex.be@xxxxxxxxxx> wrote:
> 
> To me the dcb pcp app feels like the natural way to configure the pcp to QPri mappings in the switch.

Revisiting this, I think the DCB PCP to PRIO mapping should instead configure the Port IEEE Priority Remapping registers (6352) or Ingress PCP mapping (6390). There’s nothing in dcb-app(8) that suggests to me that PRIO implies queue just because the PCP selector was used.

This is a bit unfortunate as configuring the PCP to QPri would be useful. But we could get the same end result by mapping to FPri and accepting the default FPri/QPri mapping.

(The 6352 data sheet is confusing when it refers to the IEEE-PRI register setting the “frame’s priority”, but the width of the field implies it is indeed QPri.)

I do (now) agree that MQPRIO is not the place to configure this.

Luke