Richard Cochran <richardcoch...@gmail.com> writes:

> On Tue, Aug 30, 2022 at 09:30:33AM +0200, Kurt Kanzenbach wrote:
>> ptp4l supports setting of socket priority. This is useful for traffic shaping
>> e.g., utilizing Tx steering using TAPRIO or mqprio Qdisc or VLAN egress
>> mappings.
>
> Why can't Qdisc use the dialed dscp_event and dscp_general settings?
>

That might be possible, one issue is that there are many different
interpretations/maps of the dscp field. Taking a look at the code I see
that sch_cake does something like that for a few interpretations.
Perhaps it's a good idea to move that to a more central place. So other
qdiscs can re-use that.

In the meantime, something like this should already work (not tested):

$ tc qdisc add dev $IFACE clsact
$ tc filter add dev $IFACE egress prio 1 u32 match ip dsfield $DSCP_FIELD 0xff 
action skbedit priority $PRIORITY

> Thanks,
> Richard
>
>
>
>
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-- 
Vinicius


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