Response Payload; Response Codes - Sun Microsystems storagetek sl500 Reference Manual

FC-4 (FCP) Features
If the FCP_RESID_UNDER bit is set to 1b, a transfer that did not fill the buffer to
the expected displacement. Failure to transfer FCP_DL bytes does not
necessarily indicate an error for some devices and commands.
If the FCP_RESID_OVER bit is set, the transfer was truncated because the data
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transfer required by the SCSI command extended beyond the displacement
value of FCP_DL. Those bytes that could be transferred without violating the
FCP_DL value may or may not have been transferred.
Commands that do not contain an FCP_DATA IUs, FCP_RESID_UNDER and
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FCP_RESID_OVER are set to 0b, and the value of the FCP_RESID is undefined.

Response Payload

TABLE 5-22
TABLE 5-22 FCP_RSP Payload
Feature
FCP_CONF_REQ
FCP_SNS_INFO
FCP_SNS_LEN (total)
FCP_SNS_LEN_VALID
Length of Additional Sense Bytes in FCP_SNS_INFO
FCP_RSP_INFO
FCP_RSP_LEN
FCP_RSP_LEN_VALID
FCP_RESID
FCP_RESID_OVER
FCP_RESID_UNDER

Response Codes

The Response Code field (FCP_RSP_INFO) contains information that describes the
failures detected during the execution of an I/O operation and conforms to the
following rules:
The FCP_RSP_INFO does not contain link error information because FC-PH
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provides the mechanisms for presenting these errors.
The FCP_RSP_INFO does not contain SCSI logical unit error information
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because that information is in the FCP_STATUS and FCP_SNS_INFO fields.
RSP_CODE values of 04h and 05h are not valid responses to SCSI commands.
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The RSP_CODE is independent of the SCSI Status and should be examined
before interpretation of the SCSI Status.
For other non-zero values of the RSP_CODE, the SCSI Status may not be valid.
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74 SL500: Interface Reference Manual • July 2008
lists the FCP_RSP payload fields:
FC-Tape
Initiator Target
A R
R I
≤
R 128
R I
≤
R 120
R I
R 0 or 8
R I
R R
R I
R I
Revision: F • 96122
StorageTek
Y
Y
20
Y
16
Y
8
Y
Y
Y
Y