[PATCH][RFC] usbatm.[ch]: cleanup and OAM F5 loopback

Duncan Sands baldrick at free.fr
Fri Mar 11 15:50:18 EST 2005

Hi Roman,

> Maybe it eventually should, but it's going to need massive changes to
> the way things work now.  At the moment the data goes to / from ATM
> layer in the form of cooked AAL5 skbs, and adding OAM doesn't fit easily
> into this model.  The patch living in the linux-atm tree is rather heavy
> and adds a whole lot of ioctls and the like; in addition it requires a
> userspace daemon to keep running on the same VC, which IMHO is a bit too
> fat.
> OTOH OAM loopback is as simple as taking the incoming cell, check if it
> has the same VPI and VCI (for F5), check crc10, change 1 (one!) bit in
> it, recalculate the crc10 and send it back.  Doesn't seem to be worth
> letting it go outside the driver.

if it's simple, then a simple ATM patch sounds the way to go.



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