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Address Translation Service - DAT Collaborative

Address Translation Service - DAT Collaborative 2025

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The document outlines the Address Translation Service (ATS) specification, which enables User-Level Protocols (ULPs) to utilize IP addresses over InfiniBand networks. It addresses the need for translating between IP addresses and InfiniBand Global Identifiers (GIDs), detailing the registration, querying, and management of service records that map these addresses. The ATS relies on existing InfiniBand Subnet Administration services and is designed for interoperability among various ULPs, ensuring that applications can establish connections using familiar IP addressing methods.

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What is ATS translation request?

A PCIe Function generates an ATS Translation Request which is sent through the PCIe hierarchy to the Root Port which then forwards it to SMMU. When it receives an ATS Translation Request, the SMMU performs the following basic steps: Validates that the Function has been configured to enable ATS translation.

What is address translation service in PCI?

Address Translation Services (ATS) is a mechanism in PCIe that allows devices to request address translations from the Input/Output Memory Management Unit (IOMMU). This is particularly important where devices need to access virtual memory.

Why address translation is required?

Network Address Translation allows (NAT) multiple devices to use the same public IP address and access the Internet. There can be total 232 (around 4.3 billion) different IPv4 addresses which is very less considering the number of IPv4 devices connected to the Internet. The idea of NAT saves from IP address exhaustion.

How does address translation work?

NAT is typically implemented on a router, a device that connects two networks. When a device on the private network sends data to a device on the public network, the router intercepts the data and replaces the source IP address with its own public IP address. The router then sends the data to the destination device.

What is the network address translation service?

Network Address Translation (NAT) is a process that enables one, unique IP address to represent an entire group of computers. In network address translation, a network device, often a router or NAT firewall, assigns a computer or computers inside a private network a public address.

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What do you mean by address translation?

NAT stands for network address translation. Its a way to map multiple private addresses inside a local network to a public IP address before transferring the information onto the internet. Organizations that want multiple devices to employ a single IP address use NAT, as do most home routers.

What is address translation cache in PCIe?

The translated addresses are subsequently cached in the local TLB of a PCIe device. The local TLB is named as Address Translation Cache (ATC). Locating translated addresses in the device aims to reduce latency and provides a scalable, distributed caching system that improves I/O performance.

Address Translation Service - DAT Collaborative 2025

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