Re: [PATCH v5 11/19] scsi: sd: handle read/write CDL timeout failures

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On 4/4/23 20:24, Niklas Cassel wrote:
From: Niklas Cassel <niklas.cassel@xxxxxxx>

Commands using a duration limit descriptor that has limit policies set
to a value other than 0x0 may be failed by the device if one of the
limits are exceeded. For such commands, since the failure is the result
of the user duration limit configuration and workload, the commands
should not be retried and terminated immediately. Furthermore, to allow
the user to differentiate these "soft" failures from hard errors due to
hardware problem, a different error code than EIO should be returned.

There are 2 cases to consider:
(1) The failure is due to a limit policy failing the command with a
check condition sense key, that is, any limit policy other than 0xD.
For this case, scsi_check_sense() is modified to detect failures with
the ABORTED COMMAND sense key and the COMMAND TIMEOUT BEFORE PROCESSING
or COMMAND TIMEOUT DURING PROCESSING or COMMAND TIMEOUT DURING
PROCESSING DUE TO ERROR RECOVERY additional sense code. For these
failures, a SUCCESS disposition is returned so that
scsi_finish_command() is called to terminate the command.

(2) The failure is due to a limit policy set to 0xD, which result in the
command being terminated with a GOOD status, COMPLETED sense key, and
DATA CURRENTLY UNAVAILABLE additional sense code. To handle this case,
the scsi_check_sense() is modified to return a SUCCESS disposition so
that scsi_finish_command() is called to terminate the command.
In addition, scsi_decide_disposition() has to be modified to see if a
command being terminated with GOOD status has sense data.
This is as defined in SCSI Primary Commands - 6 (SPC-6), so all
according to spec, even if GOOD status commands were not checked before.

If scsi_check_sense() detects sense data representing a duration limit,
scsi_check_sense() will set the newly introduced SCSI ML byte
SCSIML_STAT_DL_TIMEOUT. This SCSI ML byte is checked in
scsi_noretry_cmd(), so that a command that failed because of a CDL
timeout cannot be retried. The SCSI ML byte is also checked in
scsi_result_to_blk_status() to complete the command request with the
BLK_STS_DURATION_LIMIT status, which result in the user seeing ETIME
errors for the failed commands.

Co-developed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
---
  drivers/scsi/scsi_error.c | 45 +++++++++++++++++++++++++++++++++++++++
  drivers/scsi/scsi_lib.c   |  4 ++++
  drivers/scsi/scsi_priv.h  |  1 +
  3 files changed, 50 insertions(+)

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes





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