Method for user space operations for direct I/O between an application instance and an I/O adapter
US7552240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2005 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Jun 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/5011
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method that enables application instances to pass block mode storage requests directly to a physical I/O adapter without run-time involvement from either the local operating system or hypervisor. In one aspect of the present invention, a mechanism is provided for determining whether a user space operation is a resource management operation of a work processing operation. If the user space operation is a resource management operation, appropriate functions are performed to either query, create, modify or destroy resource allocations in the I/O adapter. If the user space operation is a work processing operation, appropriate functions are performed to create work queue entries and inform the I/O adapter of the work queue entries and to retrieve completion queue entries for work queue entries whose processing has been completed by the I/O adapter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.