Hardware Packet Processor Dependency Graph Modification
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Solution Overview
Problem
Software-based packet header modifications in network processing increase processing latency, negating speed optimizations provided by hardware-based packet processing, and are cumbersome in dynamic environments due to reliance on software assistance for applying packet header modifications.
Innovation Solution
Implementing hardware-based packet processing solutions, such as specialized packet processors, that can perform packet header modifications without software assistance by using dependency graphs to identify and apply modifications, including dependent operations, directly within the packet processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If software-based packet header modifications are used, then packet processing can be performed with flexibility, but processing latency increases and speed optimizations are negated
Solution Approach 1:
The patent replaces software-based packet header modification mechanisms with hardware-based mechanisms. Specifically, it uses a packet processor with dedicated hardware circuits including a parser, modification manager, and modifier units that can perform header modifications in hardware rather than through software execution, thereby eliminating the latency associated with software processing while maintaining processing flexibility through programmable hardware components.
Solution Approach 2:
The packet processor is designed to autonomously perform packet header modifications without requiring external software assistance. The modification manager circuit receives parser output and automatically generates modification operations, which are then executed by the modifier circuit. This self-service capability eliminates the need for software intervention in the packet processing path, reducing latency while maintaining adaptability through internal programmability.
2Productivity
If hardware-based packet processing is implemented, then processing speed is improved, but device complexity and cost increase
Solution Approach 1:
The packet processor is divided into distinct functional segments: a parser unit for packet header analysis, a modification manager unit for generating modification operations, and modifier units for executing modifications. This segmentation allows each component to be optimized for its specific function while working together in a coordinated manner, achieving high processing speed without excessive overall complexity.
Solution Approach 2:
The hardware-based packet processor is designed with universal components that can handle multiple packet processing functions. The modification manager and modifier circuits can be programmed to perform different types of header modifications depending on the packet type and processing requirements, providing multi-functionality that reduces the need for separate dedicated hardware for each function, thereby controlling complexity while maintaining high productivity.
Data Source
AI summary
A packet processor may implement network packet modification. A network packet may be received at a packet processor. A packet header modification may be identified for the network packet. The packet processor may access a memory to traverse a dependency graph for the packet header modification to obtain an operation to apply the packet header modification and dependent operations to update fields in the packet header to be changed as a result of the packet header modification. The dependency graph may have been stored in the memory prior to receiving the network packet. The obtained operations may be performed according to the traversal of the dependency graph. The modified packet may then be transmitted.