Efficient processing of groups of host access requests that may include zero length requests
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United States of America Patent
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Dec 14, 2010
Issued Date -
N/A
app pub date -
Dec 13, 2007
filing date -
Dec 13, 2007
priority date (Note) -
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Abstract
This is directed to methods and systems for handling access requests from a device to a host. The device may be a device that is part of the host, such as an HBA, an NIC, etc. The device may include a processor which runs firmware and which may generate various host access requests. The host access requests may be, for example, memory access requests, or DMA requests. The device may include a module for executing the host access requests, such as a data transfer block (DXB). The DXB may process incoming host access requests and return notifications of completion to the processor. For various reasons, the processor may from time to time issue null or zero length requests. Embodiments of the present invention ensure that the notifications of completion for all requests, including the zero length requests, are sent to the processor in the same order as the requests.
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