[T11.3] FCP-3: Obsolete FCP_DL and FCP_BIDIRECTIONAL_DL
David Peterson (Eng)
david_peterson at cnt.com
Tue Sep 28 20:28:15 PDT 2004
During the discussion of T10/03-393 at the recent CAP meeting the =
of obsoleting the FCP_DL and FCP_BIDIRECTIONAL_READ_DL fields in FCP-3
A bit of history that got us to this point:
The FCP-3 working has been looking at an issue where the FCP_DL value =
not equal to the CDB transfer length. The goal is/was to provide a
method to report this condition to the upper layer(s). The need for =
method drops significantly if the FCP_DL fields are obsolete. The =
may still have merit since there are other conditions such as the =
bit is set to one in a read type command and vice-versa. But no one has
really identified this is a problem case to date.
Additional reasons to obsolete such as "its redundent with the CDB
transfer length" and "FCP is the only SCSI transport protocol that
specifies a data length" have been mentioned.
Please indicate any preferences for or against obsoleting the FCP_DL =
FCP_BIDIRECTIONAL_DL fields along with your reasoning.
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