RE: [PATCH] Bpf Helper Function BPF_FUNC_skb_change_dsfield

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




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