Test Plugin Injection for User-Space Network Protocol Stack Observability
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Solution Overview
Problem
Current network device testing methods lack the ability to provide detailed observability of a Device Under Test (DUT), making it difficult to diagnose causes of latency and jitter, as the DUT appears as a black box and cannot easily inject custom logic for increased insight.
Innovation Solution
Injecting test plugins into a user-space network protocol stack on the DUT, allowing for the execution of machine language code plugins like Berkeley Packet Filters (BPF) within the same process, enabling detailed performance measurements and statistics collection without halting the protocol stack, and using a test interface for reporting results back to the test system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional network device testing methods are used, then overall performance measurement is achieved, but detailed observability of DUT operations is lost
Solution Approach 1:
The patent introduces test plugins as intermediary components that are injected into the user-space network protocol stack of the DUT. These plugins act as mediators between the DUT's internal operations and the external test system, enabling detailed observation of packet processing, latency, and other operational metrics without requiring direct modification of the DUT's core functionality or complex external instrumentation.
Solution Approach 2:
The test plugins are executed within the same process as the user-space network protocol stack, allowing the DUT to self-monitor and self-report its own operational details. The plugins leverage the DUT's existing execution environment and resources to generate detailed observability data, eliminating the need for separate external monitoring systems and reducing overall test system complexity.
2Measurement precision
If test plugins are injected into the user-space network protocol stack, then detailed performance measurements are enabled, but the protocol stack execution may be affected
Solution Approach 1:
The test plugins are designed to perform only specific, limited measurement functions within the protocol stack rather than attempting to control or modify all protocol operations. This partial action approach allows the plugins to gather detailed performance data while minimizing their impact on the overall protocol stack execution and maintaining system stability.
Solution Approach 2:
The test plugins continuously monitor protocol stack operations and provide feedback about performance metrics such as latency, packet processing time, and operational state. This feedback mechanism enables real-time performance measurement while allowing the system to maintain stability through observability without intervention, unless corrective actions are explicitly triggered based on the observed metrics.
3Measurement precision
If custom test logic is injected into DUT, then observability of latency and jitter causes is improved, but ease of operation is reduced
Solution Approach 1:
The test plugin architecture provides a universal interface and standardized injection mechanism that can be applied across different DUT types and network protocol stack implementations. The same basic plugin injection approach works for various devices and protocols, reducing the operational complexity despite the enhanced diagnostic capabilities. The plugins themselves are designed to be multi-functional, handling multiple measurement tasks with unified code structures.
Data Source
AI summary
A method for injecting a test plugin into a user-space network protocol stack executing on a device under test (DUT) and executing the test plugin during testing of the DUT includes transmitting, from a test system and to a first DUT, a first test plugin. The method further includes injecting the first test plugin into a user-space network protocol stack executing on the first DUT while the user-space network protocol stack is executing. The method further includes executing the first test plugin. The method further includes, while the first test plugin is executing, transmitting test packets to the DUT and receiving packets from the DUT. The method further includes reporting, from the DUT and to the test system, results generated from execution of the first test plugin.