$ tc filter add dev eno1 \
                   ## Common Options to filters
   protocol all \  # filters are per (device, qdisc, protocol, prio)
   parent 1234: \  # handle of the parent qdisc
   prio 1 \        # sets the order of evaluation
   handle 0x1 \    # filter's handle
                   ## Matching Part:
   fw \            # we use the fwmark matcher, if the mark matches the handle...
                   ## Action part:
   classid 1234:1  # ... push it to class 1234:1