Method for user space operations for direct I/O between an application instance and an I/O adapter
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United States of America Patent
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Jun 23, 2009
Grant Date -
Dec 21, 2006
app pub date -
May 23, 2005
filing date -
May 23, 2005
priority date (Note) -
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status (Latency Note)
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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.
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