linux-kernel - Re: [PATCH 14/20 v1] [SCSI] mpt3sas: Complete the SCSI command with DID_RESET status for log

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Date:	Fri, 19 Jun 2015 16:38:48 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
Cc:	jejb@...nel.org, hch@...radead.org, jthumshirn@...e.de,
	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 v1] [SCSI] mpt3sas: Complete the SCSI command with DID_RESET status for log_info value 0x0x32010081

>>>>> Sreekanth Reddy <sreekanth.reddy@...gotech.com> writes:

> 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.

Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering
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