[Cake] Some more cakemq thoughts

[Dave Taht]

From: https://docs.google.com/document/d/1tTYBPeaRdCO9AGTGQCpoiuLORQzN_bG3TAkEolJPh28/edit#heading=h.s3q8pyu1s825

...

The kernel has over 2500 places where it can drop packets, many of
which have been instrumented with the  “Drop_reason” facility. No
qdisc has drop_reason encoded into it yet. (Suggested names:
DROP_REASON_{CONGEST, OVERFLOW, FLOOD, SPIKE}).

QOS-MAP mirroring the same syntax as the wifi interface, this
establishes a direct correspondence between cake “tins” and the
settings for the linux wifi qos-map facility.

VLAN-MAP This maps from vlans to tins

NOWASHNQB - cake defaults to nowash allowing the passage of all dscps,
the addition of the NOWASHNQB state means it will wash out everything
except NQB.


-- 
Oct 30: https://netdevconf.info/0x17/news/the-maestro-and-the-music-bof.html
Dave Täht CSO, LibreQos