MSI-X Emulation on Network-Tunneled PCIe Devices
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Solution Overview
Problem
Existing systems face challenges in supporting improved techniques for PCIe communications, particularly in enabling MSI-X emulation on network-tunneled PCIe devices while addressing issues like network unpredictability and timeout sensitivities.
Innovation Solution
The implementation of electronic circuitry that receives interrupt signals from a remote destination over a network protocol, generates local interrupts based on a local interrupt configuration, and transmits these interrupts over a system bus, ensuring efficient MSI-X emulation and tunneling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network-tunneled PCIe communications are implemented, then connectivity between devices over a network is enabled, but network unpredictability and timeout sensitivities occur
Solution Approach 1:
The patent introduces an intermediary mechanism where the system bus driver acts as a mediator between network-tunneled PCIe communications and the interrupt handling system. The driver receives tunneled PCIe communications, extracts interrupt signals, and generates appropriate local interrupts, thereby isolating the network layer from the interrupt handling layer and reducing timeout sensitivities.
Solution Approach 2:
The patent implements preliminary action by having the system bus driver prepare and buffer interrupt configurations before actual interrupt reception. The driver pre-configures interrupt handlers and maintains state information, enabling faster response when interrupts arrive and reducing the impact of network delays.
2Productivity
If MSI-X emulation is implemented on network-tunneled PCIe devices, then interrupt handling efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies copying by creating a virtual emulation layer that replicates MSI-X interrupt handling behavior. The system bus driver copies the essential functionality of physical MSI-X interrupts into software-based interrupt handlers, allowing network-tunneled devices to be emulated without requiring complex hardware modifications.
Solution Approach 2:
The system bus driver performs multiple functions: it handles tunneled PCIe communications, extracts interrupt signals, generates local interrupts, and manages interrupt handlers. This multi-functionality consolidates what would otherwise require separate hardware components, reducing overall system complexity while maintaining MSI-X emulation capabilities.
3Ease of operation
If interrupt signals are generated and injected over system bus, then local interrupt processing is enabled, but data availability timing becomes critical
Solution Approach 1:
The patent implements preliminary action by having the system bus driver buffer and prepare data before interrupt generation. The driver ensures that data is ready in the appropriate memory location before the interrupt signal is injected, eliminating timing issues and ensuring immediate availability to the interrupt handler.
Solution Approach 2:
The system bus driver incorporates feedback mechanisms to track data transmission status and interrupt generation timing. This feedback allows the driver to coordinate data availability with interrupt injection, ensuring that data is ready when the interrupt handler begins processing.
Data Source
AI summary
Methods, systems, and devices for message signaled interrupt (MSI-X) tunneling on a host device exposed by a bridge connection are described. A device may receive data and a first interrupt signal from a remote destination over a network protocol. The device may receive the data and/or the first interrupt signal over the bridge connection, via a tunneled communication from the remote destination. The device may generate a second interrupt signal based on the first interrupt signal and a local interrupt configuration provided by a system bus driver of the device. The device may inject the data and the second interrupt signal over the system bus. Injecting the data and injecting the second interrupt signal may include ensuring the data is made available to the system bus driver, prior to the interrupt handler receiving the second interrupt signal.