datapath-windows: Upcall NL packet format: Add NL utilities

Add NlAttrSize and NlAttrTotalSize

Signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath-windows: Upcall NL packet format: Parametrized Key to NL conversion.

Extend the key and tunnel key conversion to nested NL format functions use the
NL attribute as a parameter so we can use them for missed packet formatting.

Add functions for calculating the space needed for storing the key and the
tunnel key in NL format

Signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath-windows: Upcall NL packet format: Queue elem for packe in NL format.

[1] Allocate a queue element and space to hold the packet, key, tunnel key
and user data in NL format.
[2] Format the NL header
[3] Store packet, key, tunnel key and user data in NL format
[4] Calculates and insert checksum if offloaded.

signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath-windows: Upcall NL packet format: Call NL missed packet function

Remove hard coded queue is, pass the key rather the tunnel key,
Remove the none NL implementation

Signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>