I'm using Linux 3.0.101 with iproute2-3.4.0 on a router and I'm getting this error:
tc qdisc add dev eth2.2 root handle 1: qfq
--> OK
tc class add dev eth2.2 parent 1: classid 1:10 qfq weight 1
--> Error: Qdisc "qfq" is classless.
sch_qfq.ko
was loaded with insmod before and is in use according to lsmod after the qdisc is added.