Re: [PATCH v2 2/6] ata: libata-scsi: Fix offsets for the fixed format sense data

[Hannes Reinecke <hare@suse.de>]

On 6/25/24 00:12, Igor Pylypiv wrote:
> Correct the ATA PASS-THROUGH fixed format sense data offsets to conform
> to SPC-6 and SAT-5 specifications. Additionally, set the VALID bit to
> indicate that the INFORMATION field contains valid information.
> 
> INFORMATION
> ===========
> 
> SAT-5 Table 212 — "Fixed format sense data INFORMATION field for the ATA
> PASS-THROUGH commands" defines the following format:
> 
> +------+------------+
> | Byte |   Field    |
> +------+------------+
> |    0 | ERROR      |
> |    1 | STATUS     |
> |    2 | DEVICE     |
> |    3 | COUNT(7:0) |
> +------+------------+
> 
> SPC-6 Table 48 - "Fixed format sense data" specifies that the INFORMATION
> field starts at byte 3 in sense buffer resulting in the following offsets
> for the ATA PASS-THROUGH commands:
> 
> +------------+-------------------------+
> |   Field    |  Offset in sense buffer |
> +------------+-------------------------+
> | ERROR      |  3                      |
> | STATUS     |  4                      |
> | DEVICE     |  5                      |
> | COUNT(7:0) |  6                      |
> +------------+-------------------------+
> 
> COMMAND-SPECIFIC INFORMATION
> ============================
> 
> SAT-5 Table 213 - "Fixed format sense data COMMAND-SPECIFIC INFORMATION
> field for ATA PASS-THROUGH" defines the following format:
> 
> +------+-------------------+
> | Byte |        Field      |
> +------+-------------------+
> |    0 | FLAGS | LOG INDEX |
> |    1 | LBA (7:0)         |
> |    2 | LBA (15:8)        |
> |    3 | LBA (23:16)       |
> +------+-------------------+
> 
> SPC-6 Table 48 - "Fixed format sense data" specifies that
> the COMMAND-SPECIFIC-INFORMATION field starts at byte 8
> in sense buffer resulting in the following offsets for
> the ATA PASS-THROUGH commands:
> 
> Offsets of these fields in the fixed sense format are as follows:
> 
> +-------------------+-------------------------+
> |       Field       |  Offset in sense buffer |
> +-------------------+-------------------------+
> | FLAGS | LOG INDEX |  8                      |
> | LBA (7:0)         |  9                      |
> | LBA (15:8)        |  10                     |
> | LBA (23:16)       |  11                     |
> +-------------------+-------------------------+
> 
> Reported-by: Akshat Jain <akshatzen@google.com>
> Fixes: 11093cb1ef56 ("libata-scsi: generate correct ATA pass-through sense")
> Cc: stable@vger.kernel.org
> Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
> ---
>   drivers/ata/libata-scsi.c | 26 +++++++++++++-------------
>   1 file changed, 13 insertions(+), 13 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
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