Method and system for supporting read operations with CRC for iSCSI and iSCSI chimney
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United States of America Patent
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Aug 9, 2011
Grant Date -
Jan 19, 2006
app pub date -
Jun 17, 2005
filing date -
Aug 30, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Certain embodiments of the invention may be found in a method and system for performing SCSI read operations with a CRC via a TCP offload engine. Aspects of the method may comprise receiving an iSCSI read command from an initiator. Data may be fetched from a buffer based on the received iSCSI read command. The fetched data may be zero copied from the buffer to the initiator and a TCP sequence may be retransmitted to the initiator. A digest value may be calculated, which may be communicated to the initiator. An accumulated digest value stored in a temporary buffer may be utilized to calculate a final digest value, if the buffer is posted. The retransmitted TCP sequence may be processed and the fetched data may be zero copied into an iSCSI buffer, if the buffer is posted. The calculated final digest value may be communicated to the initiator.
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