table: hash

table: hash

Various types of hash tables presented under the Packet Framework toolbox.

Hash table types:
1. Extendible bucket (ext): when bucket is full, bucket is extended with
   more keys
2. Least Recently Used (LRU): when bucket is full, the LRU entry is discarded
3. Pre-computed key signature: RX core extracts the key n-tuple from the
   packet, computes the key signature and saves the key and key signature
   within the packet meta-data; flow classification core performs the actual
   lookup (the bucket search stage) after reading the key and key signature
   from packet meta-data
4. Signature computed on-the-fly (do-sig version): the same CPU core extracts
   the key n-tuple from pkt, computes key signature and performs the table
   lookup
5. Configurable key size or optimized for single key size (8-byte, 16-byte
   and 32-byte key sizes)

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Acked-by: Pablo de Lara Guarch <pablo.de.lara.guarch@intel.com>
Acked by: Ivan Boule <ivan.boule@6wind.com>