iSCSI draft-07 Padding

[Michael Schoberg <michael_schoberg@cnt.com>]

I couldn't find anything in the latest iSCSI spec (draft-07) that prevents
someone from issuing multiple padded PDU's for iSCSI Data In/Out segments.
I guess I'm worried that someone could issue padded odd-length write/read
data when it wasn't necessary.  Example: When moving a 512 byte disk sector
an initiator/target could legally issue 512 1-byte DataSegmentLength
messages (each padded up to a 32-bit boundary).  This isn't the sort of data
stream one would expect, but it's allowed in the draft.

This also leads into whether fixed or minimum length data segments (for all
but the last) would be nice to include as part of the spec.  It may result
in a simpler software/hardware design.