Method of offloading iSCSI PDU corruption-detection digest generation from a host processing unit, and related iSCSI offload engine
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United States of America Patent
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May 7, 2013
Grant Date -
May 4, 2006
app pub date -
Nov 4, 2005
filing date -
Nov 4, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of offloading, from a host data processing unit (205), the generation of data corruption-detection digests for iSCSI PDUs to be transmitted as TCP segments over respective TCP connections. An iSCSI layer processing software (310) executed by the host data processing unit provides a command descriptor list (320) containing command descriptors adapted to identify portions of at least one iSCSI PDU to be transmitted, and data corruption-detection digest descriptors (CRC DESC(PDUa); CRC DESC(PDUb)), each one associated with a respective PDU data corruption-detection digest. An iSCSI processing offload engine (223) transmits the iSCSI PDU over the respective TCP connection, based on the descriptors in the command descriptor list; during the transmission, the iSCSI PDU data corruption-detection digest are calculated, and the calculated data corruption-detection digest is saved in the corresponding data corruption-detection digest descriptor in the command descriptor list.
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