[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


Howdy All,

During the discussion of T10/03-393 at the recent CAP meeting the =
notion
of obsoleting the FCP_DL and FCP_BIDIRECTIONAL_READ_DL fields in FCP-3
was mentioned.

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 =
is
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 =
this
method drops significantly if the FCP_DL fields are obsolete. The =
method
may still have merit since there are other conditions such as the =
WRDATA
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 =
and
FCP_BIDIRECTIONAL_DL fields along with your reasoning.

Thanks...Dave

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