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.

Claims

20 · 2 independent · depth 4

20 granted claims

›1.independentA method for performing a SCSI read operation via a TCP offload engine, the method comprising:nreceiving an iSCSI read command from an initiator;fetch…+9

›2.↳ 1The method according to claim 1, comprising:nutilizing an accumulated digest value stored in a temporary buffer for calculating a final digest value, …d2

›3.↳ 1The method according to claim 1, comprising:nidentifying an additional header and a base header;placing the header digest value in a temporary buffer.d2

›4.↳ 1The method according to claim 1, comprising placing said zero copied fetched data into said buffer.d2

›5.↳ 1The method according to claim 1, comprising invoking a recovery procedure if the header digest value has failed.d2+3

›9.↳ 1The method according to claim 1, comprising generating an out of order message, if frames of said zero copied fetched data are not in order.d2

›10.↳ 1The method according to claim 1, comprising communicating the header digest value to said initiator, if frames of said zero copied fetched data are no…d2

›11.independentA system for performing a SCSI read operation via a TCP offload engine, the system comprising:na target that is operable to receive an iSCSI read comm…+9

›12.↳ 11The system according to claim 11, wherein:nsaid at least one driver is operable to utilize an accumulated digest value stored in a temporary buffer fo…d2

›13.↳ 11The system according to claim 11, wherein:nsaid at least one driver is operable to identify an additional header and a base header;said at least one d…d2

›14.↳ 11The system according to claim 11, wherein said at least one driver is operable to place said zero copied fetched data into said buffer.d2

›15.↳ 11The system according to claim 11, wherein said at least one driver is operable to invoke a recovery procedure if the header digest value has failed.d2+3

›19.↳ 11The system according to claim 11, wherein said at least one driver is operable to generate an out of order message, if frames of said zero copied fetc…d2

›20.↳ 11The system according to claim 11, wherein said at least one driver is operable to communicate the header digest value to said initiator, if frames of …d2

Classifications

4 codes

IPC · International Patent Classification

Section G — Physics

G06F3/00

USPC · US Patent Classification

710/5710/22709/212

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Pendency

6.1 y

2,244 days filing → grant

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non-final + final

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1 RCE

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Examiner

Henry W Tsai

art unit 2184 · TC 2100

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Citations: 494 back · 0 forward

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Priority chain

2 priority documents

Priority

6 Sep 2002

earliest claimed

›Priority documents — 2

Type	Document	Date
provisional	US 60408617	6 Sep 2002
related publication	US 20060015655 A1	19 Jan 2006

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