ATM PVCs deleted by dsmark

[Joachim Hillebrand <joachim.hillebrand@gmx.at>]

Hi all,

We have created a core-router script which uses different
ATM PVCs for different DS marking.

After creating a ds_mark queuing discipline at the root
and adding some filters we execute the following commands:
(parent 1:1 is a ds_mark class)

> tc qdisc add dev parent 1:1 handle 2: atm
> tc class add dev parent 2:0 classid 2:1 atm pvc 1.0.51
> cat /proc/net/atm/pvc

Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)
  0   1    41 5         0 UBR         0 UBR   CLIP, Itf:atm11, ...
  1   0    60 5         0 UBR         0 UBR   CLIP, Itf:atm12, ...
  1   0    51 5         0 off         0 UBR   

Now we execute (parent 1:2 is a ds_mark class)
> tc qdisc add dev atm12 parent 1:2 handle 3: atm

and surprisingly it deletes the other PVC (1.0.51) instead of
creating a new one (1.0.52).

> cat /proc/net/atm/pvc   shows now

Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)
  0   1    41 5         0 UBR         0 UBR   CLIP, Itf:atm11, ...
  1   0    60 5         0 UBR         0 UBR   CLIP, Itf:atm12, ... 

Why does this happen?
The whole script (incl. Kernel messages) can be found on the
Web at linuxatm.freewebsites.com

Thanks

Joachim




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