[LARTC] tc filter can target only leaf classes?

[Andreas Hasenack <ahasenack@terra.com.br>]

(using htb)

I'm trying to learn tc filter and it seems the flowid parameter can only
point to leaf classes. Actually, it can point anywhere, but it doesn't
seem to work unless it points to a leaf class. Is this correct?

For example, I have this tree:

			eth0
			|
		 +------1:-------+
                 |               |
         +------1:10		1:20
         |       |               |
	1:30	1:40		20:
         |       |
	30:	40:

1: is htb qdisc, with default pointing to minor 20.

And this filter:

iptables -t mangle -A OUTPUT -d $DSTHOST -j MARK --set-mark 1
tc filter add dev $DEV parent 1:0 prio 1 protocol ip \
        handle 1 \
        fw \
        flowid 1:10

Now, I only see 1:10 getting the traffic if 1:30 and 1:40 don't exist.
The moment I add 1:30, 1:40 and their qdiscs, the above filter stops
working and this same traffic starts going to 1:20, which is the default
set at 1:'s qdisc. 

Why does the filter stop working? I was expecting it to keep working and
then I could further filter this traffic into 1:30 and 1:40 *at* 1:10.

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