linux-kernel - Re: [PATCH 14/20] [SCSI] mpt3sas: Complete the SCSI command with DID_RESET status for log

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Message-ID: <20150615100156.GL5660@c203.arch.suse.de>
Date:	Mon, 15 Jun 2015 12:01:56 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
Cc:	jejb@...nel.org, hch@...radead.org, martin.petersen@...cle.com,
	linux-scsi@...r.kernel.org, JBottomley@...allels.com,
	Sathya.Prakash@...gotech.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/20] [SCSI] mpt3sas: Complete the SCSI command with
  DID_RESET status for log_info value 0x0x32010081

On Fri, Jun 12, 2015 at 03:12:26PM +0530, Sreekanth Reddy wrote:
> For any SCSI command, if the driver receives
> IOC status = SCSI_IOC_TERMINATED and log info = 0x32010081 then
> that command will be completed with DID_RESET host status.
> 
> The definition of this log info value is
> "Virtual IO has failed and has to be retried".
> 
> Firmware will provide this log info value with IOC Status
> "SCSI_IOC_TERMINATED", whenever a drive (with is a part of a volume)
> is pulled and pushed back within some minimal delay.
> With this log info value, firmware informs the driver to retry the
> failed IO command infinite times, so to provide some time for the
> firmware to discover the reinserted drive successfully instated of
> just retrying failed command for five times(doesn't giving enough
> time for firmware to complete the drive discovery) and failing the
> IO permanently even though drive came back successfully.
> 
> Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@...gotech.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_scsih.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
> index 64dd90b..837c22a 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
> @@ -4241,6 +4241,9 @@ _scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
>  				scmd->device->expecting_cc_ua = 1;
>  			}
>  			break;
> +		} else if (log_info == 0x32010081) {
> +			scmd->result = DID_RESET << 16;
> +			break;

Could you make that a #define instead of some magic vlaue, so everyone can see
what is happening when reading the source?

>  		}
>  		scmd->result = DID_SOFT_ERROR << 16;
>  		break;
> -- 
> 2.0.2
> 
> --
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-- 
Johannes Thumshirn                                       Storage
jthumshirn@...e.de                             +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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HRB 21284 (AG Nürnberg)
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