The qdisc cache is host wide, the parent classid is not unique
so the ifindex of the parent tc object must be set in the filter
otherwise a leaf qdisc with an identical parent id in another
device can be mistaken.
This also converts the class_cache to be passed up through the
stack to make clear it is not system wide but specific to the
ifindex we are currently handling.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
f9c714fa15