Tag allocation for non-posted commands in a PCIe application layer
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United States of America Patent
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Dec 12, 2017
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app pub date -
Jan 30, 2015
filing date -
Jan 30, 2015
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Abstract
Embodiments herein provide for tag allocation in a PCIe application layer. In one embodiment, an apparatus operable to interface with a plurality of virtual functions and a plurality of physical functions to process data via the PCIe protocol. The apparatus includes a packet builder communicatively coupled to each of the virtual functions and the physical functions and operable to build packets for non-posted commands from the virtual and physical functions. The apparatus also includes a tag allocator operable to allocate tags from a first set of tags to the packets of non-posted commands from any of the virtual and physical functions employing extended tags when the tags of the first set are available, and to reserve a second different set of tags for remaining virtual and physical functions not employing extended tags until the first set of tags are all allocated.
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