skbedit priority action vs tc-flower hw_tc

Hi,

I noticed that there seem to be 2 ways of doing the same thing, which
is performing QoS classification. The skbedit priority offload action
goes through FLOW_ACTION_PRIORITY, and hw_tc goes through
tc_classid_to_hwtc.
It appears that drivers are using one or the other method mostly at random.
Also, there appears to be no way of doing the other thing: matching on
a certain traffic class with flower (e.g. installing a traffic class
policer). How would that be done?

Thanks,
-Vladimir