Packet Payload Accelerator Context Reconstruction
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Solution Overview
Problem
Computational accelerators face challenges in handling packet retransmissions and out-of-order packets due to the complexity of connection-oriented transport protocols like TCP, leading to a burden on the host CPU and inefficiencies in cryptographic operations.
Innovation Solution
The accelerator maintains and reconstructs flow state and context information independently using protocol information from packet headers and payloads, enabling autonomous reconstruction of context data for retransmitted or out-of-order packets, reducing CPU burden and conserving communication bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the accelerator implements packet header processing and communication protocol logic in addition to its intended computational function, then it can process packet payloads independently without CPU intervention, but the device complexity increases significantly
Solution Approach 1:
The patent segments the protocol processing functionality into distinct modules: a packet processing unit that handles TCP/IP protocol logic, a cryptographic processing unit that handles encryption/decryption, and a context management unit that maintains flow state information. This segmentation allows each unit to specialize in specific tasks while working together to achieve full packet processing capability.
Solution Approach 2:
The patent introduces a context information structure as an intermediary between the packet processing unit and cryptographic processing unit. This context structure stores flow state information including TCP sequence numbers, encryption keys, and protocol parameters, enabling the cryptographic unit to perform operations independently without direct CPU intervention for each packet.
2Loss of time
If the accelerator autonomously reconstructs context information for retransmitted packets, then CPU burden is reduced and communication bandwidth is conserved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing context information structures that contain all necessary protocol state data (TCP sequence numbers, encryption keys, flow identifiers) before packet transmission. When retransmission is needed, the accelerator can directly reuse or adjust this pre-prepared context without requiring CPU intervention to reconstruct it from scratch.
Solution Approach 2:
The patent employs feedback mechanisms where the packet processing unit monitors packet transmission status and automatically updates context information in response to acknowledgments or retransmission requests. This feedback loop enables autonomous context management, where the accelerator adjusts its internal state based on network conditions without CPU involvement.
3Reliability
If the accelerator handles connection-oriented transport protocols with sequence numbers and retransmission logic, then reliable data transmission is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the TCP reliability functions (sequence number tracking, retransmission logic, acknowledgment handling) with the cryptographic processing functions (encryption, decryption, authentication) into a single integrated accelerator device. This combination eliminates the need for separate hardware components while achieving both reliable transmission and secure encryption in one unit.
Solution Approach 2:
The patent designs the accelerator with universal functionality to handle multiple protocol operations: packet parsing, sequence number validation, retransmission management, encryption/decryption, and authentication. The cryptographic processing unit can operate in different modes (encrypt, decrypt, authenticate) based on the same hardware resources, achieving multi-functionality without proportionally increasing complexity.
Data Source
AI summary
Apparatus including a first interface to a host processor, a second interface to transmit and receive data packets having headers and payloads, to and from a packet communication network, a memory holding context information regarding a flow of the data and assigning serial numbers to the data packets in the flow, according to a session-layer protocol, and processing circuitry between the first and second interfaces and having acceleration logic, to decode the data records according to the session-layer protocol, using and updating the context information based on the serial numbers and the data records of the received packets, and processing circuitry writing the decoded data records through the first interface to a host memory. The acceleration logic, upon receiving in a given flow a data packet containing a serial number that is out of order, reconstructs the context information and applies that context information in decoding data records in subsequent data packets in the flow.