#10 Support OAM F5 loopback on usbatm while PVC in use

[Jeremy Jackson]

Currently, usbatm driver rejects attempts to use AAL0 socket, so atmdump -t 4 0.0.35 fails. Also, when br2684ctl has a PVC used, it doesn't attempt. This is a very useful diagnostic, to check for packet loss without disconnecting.

A hint at how this might be done is here:

http://atm.tut.fi/list-archive/linux-atm-2005/msg00043.html

[Jeremy Jackson]

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I believe one reason this is useful is that a subtended remote-DSLAM might have congestion on the ATM circuit back to the Host DSLAM, and this is sometimes mistaken as local loop problems.