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Setting the CLP (Cell Loss Priority) bit
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At the socket API: Enabled via the socket option SO_SETCLP (in SOL_ATM).
Default is off.
Above the driver interface: before calling dev->ops->send on an skb,
vcc->atm_options must be copied into skb->atm.atm_options. This is
similar to the initialization of skb->atm.iovcnt.
At the driver interface: Bit ATM_ATMOPT_CLP is set in skb->atm.atm_options
at the time dev->ops->send is called.
A driver is not required to honor ATM_ATMOPT_CLP.
ATM_ATMOPT_CLP may only be applied to AAL5 at the moment. It may or may
not work for AAL0. (In the future, attempting to set SO_SETCLP for AAL0
may yield an error.)
Drivers currently supporting CLP: ENI and ZATM.
Note that CLP support is completely untested yet.
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