[LARTC] tc filter add ... fw returns RTNETLINK answers: Invalid argument

[Flemming Frandsen]

When I run this:
tc filter add dev eth0 parent 1: protocol ip prio 1 handle 1 fw

I get:
RTNETLINK answers: Invalid argument

The traditional interpretation of that gnarly error message is that 
cls_fw is missing, but lsmod | grep cls_fw gets me:
cls_fw                  2336   4  (autoclean)

I can't remove it because it's in use, but all 4 statements that use it 
failed, so I'm really stumped.


This is what happens in begining of the traffic shaper script:

+ tc qdisc del dev eth0 root
+ tc qdisc add dev eth0 root handle 1: htb default 0x42
+ tc class add dev eth0 parent 1: classid 1:1 htb rate 700kbit burst 6k
+ tc class add dev eth0 parent 1:1 classid 1:42 htb rate 600kbit burst 
15k prio 0
+ tc qdisc add dev eth0 parent 1:42 handle 42: sfq perturb 20
+ tc filter add dev eth0 parent 1: protocol ip prio 1 handle 1 fw
RTNETLINK answers: Invalid argument
+ iptables -t mangle -N to-dsl

Any clues?