[stgt] [RFC PATCH 0/2] Return NAA VPD descriptor, expected by Win initiator

[nezhinsky at gmail.com]

From: Alexander Nezhinsky <nezhinsky at gmail.com>

I have implemented a simple NAA descriptor, returned in addition to SCSI ID.

Now Linux returns this info:

$ sudo sg_inq --page=0x83 /dev/sg4
VPD INQUIRY: Device Identification page
  Designation descriptor number 1, descriptor length: 40
    designator_type: T10 vendor identification,  code_set: ASCII
    associated with the addressed logical unit
      vendor id: IET     
      vendor specific: 00010001
  Designation descriptor number 2, descriptor length: 12
    designator_type: NAA,  code_set: Binary
    associated with the addressed logical unit
      NAA 3, Locally assigned:
      [0x3000000100000001]

Citing the requirements by MS:
 "For VPD Page 83, type 2 or type 3 descriptors nust be returned and
 must be unique for each logical unit."

NAA is type 3. It has an option for vendor specific, "locally assigned" descriptor.
TYpe 2, EUI descriptor has no such option and requires a certified vendor id.
scst returning EUI violates its basic requirements. Perhaps it is swallowed
by Win initiator. Anyway, if the "local" NAA works, then it seems the least
agressive fake id.

I hope it is *not* what was meant by the MS document:
 "Vendor-specific device identifiers, if present, must use type 0 
 and follow the specified format, including correct page length;  
 vendor specific identifiers are not a substitute 
 for the mandatory type 2/3 descriptors."

vendor specific identifier of type 0 is:
 "7.7.3.3 Vendor specific designator format
    If the designator type is 0h (i.e., vendor specific), 
    no assignment authority was used..."

Thus i hope that a vendor-specific (localy assigned) within
the framework of NAA is ok.

Please try to re-run the Windows-based test with the new code.

Alexander Nezhinsky (2):
  spc_inquiry: store evpd flag and page code in local vars; remove
    redundant if
  add NAA Locally Assigned designator to 0x83 VPD page

 usr/spc.c  |   46 ++++++++++++++++++++++++++++++++++++----------
 usr/tgtd.h |    1 +
 2 files changed, 37 insertions(+), 10 deletions(-)

-- 
1.7.9.6

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