On 2024/08/07 13:32, Bart Van Assche wrote:
> The SCSI core does not retry passthrough commands even if the SCSI device
> reports a retryable unit attention condition. Support retrying in this case
> by introducing the SCMD_RETRY_PASST_ON_UA flag.
This flag is badly named since nowhere it is checked that the retry happens on
UNIT ATTENTION. The retry may happen with other sense key as well, no ?
So what about simply calling this: SCMD_RETRY_PASSTHROUGH ?
>
> Cc: Damien Le Moal <dlemoal@xxxxxxxxxx>
> Cc: Mike Christie <michael.christie@xxxxxxxxxx>
> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
> ---
> drivers/scsi/scsi_error.c | 5 ++++-
> include/scsi/scsi_cmnd.h | 5 ++++-
> 2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
> index 612489afe8d2..38e3ea85e381 100644
> --- a/drivers/scsi/scsi_error.c
> +++ b/drivers/scsi/scsi_error.c
> @@ -1855,7 +1855,10 @@ bool scsi_noretry_cmd(struct scsi_cmnd *scmd)
> * assume caller has checked sense and determined
> * the check condition was retryable.
> */
> - if (req->cmd_flags & REQ_FAILFAST_DEV || blk_rq_is_passthrough(req))
> + if (req->cmd_flags & REQ_FAILFAST_DEV)
> + return true;
> + if (blk_rq_is_passthrough(req) &&
> + !(scmd->flags & SCMD_RETRY_PASST_ON_UA))
> return true;
>
> return false;
> diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
> index 45c40d200154..43c584fbeaca 100644
> --- a/include/scsi/scsi_cmnd.h
> +++ b/include/scsi/scsi_cmnd.h
> @@ -58,8 +58,11 @@ struct scsi_pointer {
> */
> #define SCMD_FORCE_EH_SUCCESS (1 << 3)
> #define SCMD_FAIL_IF_RECOVERING (1 << 4)
> +/* If set, retry a passthrough command in case of a unit attention. */
> +#define SCMD_RETRY_PASST_ON_UA (1 << 5)
> /* flags preserved across unprep / reprep */
> -#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING)
> +#define SCMD_PRESERVED_FLAGS \
> + (SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING | SCMD_RETRY_PASST_ON_UA)
>
> /* for scmd->state */
> #define SCMD_STATE_COMPLETE 0
>
--
Damien Le Moal
Western Digital Research
