Netronome Systems Incorporated

Hetal Sanket Borad

Gavin J Stark

Ron Lamar Swartzentruber

A novel hash range lookup command is disclosed. In an exemplary embodiment, a method includes (a) providing access to a hash table that includes hash buckets having hash entry fields; (b) receiving a novel hash lookup command; (c) using the hash lookup command to determine hash command parameters, a hashed index value, and a flow key value; (d) using the hash command parameters and the hashed index value to generate hash values (addresses) to access entry fields in a selectable number of hash buckets; (e) comparing bits of the entry value in the entry field to bits of the flow key value; (f) repeating (d) through (e) until a match is determined or until the selectable number of hash buckets and entries have been accessed; and (g) returning either an address of the entry field containing the match or a result associated with the entry field containing the match.

Hash range lookup command

A transactional memory (TM) receives a lookup command across a bus from a processor. Only final result values are stored in memory. The command includes a base address, a starting bit position, and mask size. In response to the lookup command, the TM pulls an input value (IV). A selecting circuit within the TM uses the starting bit position and mask size to select a portion of the IV. The portion of the IV and the base address are used to generate a memory address. The memory address is used to read a word containing multiple result values (RVs) from memory. One RV from the word is selected using a multiplexing circuit and a result location value (RLV) generated from the portion of the IV. A word selector circuit and arithmetic circuits are used to generate the memory address and RLV. The TM sends the selected RV to the processor.

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Boxborough, MA, United States of America

Hetal Sanket Borad