ingress qdisc question

Hi,
i'm trying to apply policing the incoming traffic on my ppp0 interface.

tc qdisc add dev ppp0 handle ffff: ingress
tc filter add dev ppp0 parent ffff: protocol ip prio 50 u32 match ip src
0.0.0.0/0 police rate 600kbit burst 10k drop flowid :1

the qdisc is shown with the -s command of tc; however, the filter is not
shown by typing "tc -s filter ls dev ppp0". Where's the problem?

I'm using iptables v1.2.7a, custom kernel with all a traffic shaper could
need, and the latest version of tc.

Furthermore, is it possible to apply the above filter to packets NOT coming
from port 22?

Thanks in advance,

MatB