[LARTC] deleting tc rules

["Martin Schiøtz" <malinux@gmail.com>]

Hi

I'm doing traffic shaping with tc on '10.0.0.0/30' and '10.0.0.28/30'.
I want to delete part of shaping rules on the fly. (see my
configuration at the end of this mail)

I wan't to delete the shaping for '10.0.0.0/30' on the fly while still
keeping the shaping for part '10.0.0.28/30' running.

When I for example delete rules beginning with the last added rules -
I get an error when deleting the rule for 'class':

[root@malinko shape_www-0.20]# tc filter del dev eth0 protocol ip prio
5 parent 2:22 u32 ht 104:3: match ip dst 10.0.0.3 flowid 2:1012
[root@malinko shape_www-0.20]# tc qdisc del dev eth0 parent 2:1012
handle 1012: sfq perturb 4
[root@malinko shape_www-0.20]# tc class del dev eth0 parent 2:22
classid 2:1012 htb rate 128kbit ceil 128kbit burst 0 cburst 0
RTNETLINK answers: Device or resource busy 

If I try to delete the whole part of 'handle 104':

[root@malinko shape_www-0.20]# tc filter del dev eth0 protocol ip prio
5 parent 2: u32 match ip dst 10.0.0.0/30 hashkey mask 0x000000ff at 16
link 104:
[root@malinko shape_www-0.20]# tc filter del dev eth0 parent 2:22
handle 104: protocol ip prio 5 u32 divisor 256

Here there is no error but all filter rules is deleted also filter
rules for '10.0.0.0/30' and a have no shaping at all.

Are there known bugs when deleting with tc?
Is there some way to do this?


This is my test configation:
---------------------------------------
# shaping eth0 trunk
tc qdisc add dev eth0 root handle 2: htb
tc class add dev eth0 parent 2: classid 2:22 htb rate 34mbit ceil
34mbit burst 0kbit cburst 0kbit
tc filter add dev eth0 parent 2:22 protocol ip prio 5 u32

# shaping 10.0.0.28/30 #
tc filter add dev eth0 parent 2:22 handle 102: protocol ip prio 5 u32
divisor 256
tc filter add dev eth0 protocol ip prio 5 parent 2: u32 match ip dst
10.0.0.28/30 hashkey mask 0x000000ff at 16 link 102:

tc class add dev eth0 parent 2:22 classid 2:1002 htb rate 128kbit ceil
128kbit burst 0 cburst 0
tc qdisc add dev eth0 parent 2:1002 handle 1002: sfq perturb 4
tc filter add dev eth0 protocol ip prio 5 parent 2:22 u32 ht 102:1d:
match ip dst 10.0.0.29 flowid 2:1002
tc class add dev eth0 parent 2:22 classid 2:1004 htb rate 128kbit ceil
128kbit burst 0 cburst 0
tc qdisc add dev eth0 parent 2:1004 handle 1004: sfq perturb 4
tc filter add dev eth0 protocol ip prio 5 parent 2:22 u32 ht 102:1e:
match ip dst 10.0.0.30 flowid 2:1004
tc class add dev eth0 parent 2:22 classid 2:1006 htb rate 128kbit ceil
128kbit burst 0 cburst 0
tc qdisc add dev eth0 parent 2:1006 handle 1006: sfq perturb 4
tc filter add dev eth0 protocol ip prio 5 parent 2:22 u32 ht 102:1f:
match ip dst 10.0.0.31 flowid 2:1006

# shaping 10.0.0.0/30 #
tc filter add dev eth0 parent 2:22 handle 104: protocol ip prio 5 u32
divisor 256
tc filter add dev eth0 protocol ip prio 5 parent 2: u32 match ip dst
10.0.0.0/30 hashkey mask 0x000000ff at 16 link 104:
tc class add dev eth0 parent 2:22 classid 2:1008 htb rate 128kbit ceil
128kbit burst 0 cburst 0
tc qdisc add dev eth0 parent 2:1008 handle 1008: sfq perturb 4 
tc filter add dev eth0 protocol ip prio 5 parent 2:22 u32 ht 104:1:
match ip dst 10.0.0.1 flowid 2:1008
tc class add dev eth0 parent 2:22 classid 2:1010 htb rate 128kbit ceil
128kbit burst 0 cburst 0
tc qdisc add dev eth0 parent 2:1010 handle 1010: sfq perturb 4 
tc filter add dev eth0 protocol ip prio 5 parent 2:22 u32 ht 104:2:
match ip dst 10.0.0.2 flowid 2:1010
tc class add dev eth0 parent 2:22 classid 2:1012 htb rate 128kbit ceil
128kbit burst 0 cburst 0
tc qdisc add dev eth0 parent 2:1012 handle 1012: sfq perturb 4
tc filter add dev eth0 protocol ip prio 5 parent 2:22 u32 ht 104:3:
match ip dst 10.0.0.3 flowid 2:1012

Best regards,
Martin
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