Configurable Logic Device TCP Segmentation Offload
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Solution Overview
Problem
Current testing solutions for content-aware network devices are inadequate, failing to rigorously test performance and security under real-world conditions, especially at line speeds, due to their focus on traditional IP network testing and lack of consideration for Layers 4-7 attributes, leading to deployment challenges and potential failures.
Innovation Solution
A network testing system that offloads data-intensive tasks to a configurable logic device (CLD), preparing TCP packets with headers and payloads, and generating segment packets for transmission on an external network interface, enabling comprehensive testing of content-aware systems across Layers 2-7.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional IP network testing approaches are used, then testing infrastructure complexity is reduced, but testing capability for content-aware devices and Layers 4-7 is insufficient
Solution Approach 1:
The testing system is divided into separate functional modules: a packet generator for creating test traffic, a configurable logic device for emulating network conditions and content-aware processing, and a performance measurement system. This segmentation allows each component to be optimized independently while collectively providing comprehensive testing capability for Layers 2-7 without requiring complete redesign of the entire testing infrastructure.
Solution Approach 2:
A configurable logic device is introduced as an intermediary between the packet generator and the network device under test. This intermediary emulates content-aware processing, deep packet inspection, and various network conditions, enabling sophisticated testing of Layers 4-7 functionality without directly integrating complex testing logic into the measurement system itself.
2Reliability
If comprehensive content-aware testing at line speed is implemented, then testing accuracy and reliability are improved, but processing load on the test system increases
Solution Approach 1:
The packet generation and segmentation functions are extracted from the main processing system and implemented in dedicated hardware or firmware modules. This allows high-speed packet creation and TCP segmentation to occur with minimal CPU intervention, maintaining testing reliability at line speeds while reducing the processing load on the main system.
Solution Approach 2:
Software-based packet processing is replaced with hardware-accelerated TCP segmentation and packet transmission functions. By using dedicated hardware resources for packet segmentation and transmission, the system achieves line-speed testing capability without proportionally increasing CPU processing load or energy consumption.
3Productivity
If TCP segmentation offload is implemented, then processor workload is reduced, but device complexity increases
Solution Approach 1:
The configurable logic device is designed to perform multiple functions including TCP segmentation offload, packet filtering, traffic shaping, and emulation of various network conditions. By making this single device multi-functional, the system reduces processor workload through TCP segmentation offload without proportionally increasing overall device complexity, as the same hardware platform supports multiple testing and processing tasks.
Data Source
AI summary
A method of offloading data intensive tasks from a processor, comprises, at a processor, preparing a TCP packet comprising a TCP header and a data payload, transmitting the TCP packet to a configurable logic device (CLD); and at the CLD, receiving the TCP packet, generating set of TCP segment packets containing, a copy of the TCP header, an incrementing segment sequence identifier, and a portion of the data payload, and transmitting the set of TCP segment packets on an external network interface.