1. Circuitry for processing a communication packet, the circuitry comprising: a look-up engine configured to transfer a first selector to a content-addressable memory and receive a corresponding first result from the content-addressable memory, generate a second selector based on the first result, transfer the second selector to the content-addressable memory and receive a corresponding second result from the content-addressable memory, retrieve a first context structure based on the second result, build a summation block using the first context structure, and transfer the summation block; and a processor configured to receive and process the summation block to control handling of the communication packet.