On Tue, Dec 21, 2021 at 02:13:04PM -0800, Maciej Żenczykowski wrote:

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As for what is driving this?  Upcoming wifi standard to allow
access points to inform client devices how to dscp mark individual flows.

Interesting.

How does the sending host get this dscp value from wifi and then
affect the dscp of a particular flow?  Is the dscp going to be
stored in a bpf map for the bpf prog to use?

It gets it out of band via some wifi signaling mechanism.
Tyler probably knows the details.

Storing flow match information to dscp mapping in a bpf map is indeed the plan.

This is for an upcoming QoS Wifi Alliance spec. Wifi will get the dscp for a corresponding
flow and as Maze said the current plan is to store this map info in bpf to modify packets.