Re: [PATCH 14/20] [SCSI] mpt3sas: Complete the SCSI command with DID_RESET status for log_info value 0x0x32010081

Sreekanth Reddy
2015-06-15T11:01:12Z

On Mon, Jun 15, 2015 at 3:31 PM, Johannes Thumshirn <jthumshirn@suse.de> wrote:
> 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@avagotech.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?

Sure, I will define a macro for this log_info value.

Thanks,
Sreekanth
>
>> }
>> scmd->result = DID_SOFT_ERROR << 16;
>> break;
>> --
>> 2.0.2
>>
>> --
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>
> --
> Johannes Thumshirn Storage
> jthumshirn@suse.de +49 911 74053 689
> SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
> HRB 21284 (AG Nürnberg)

--

Regards,
Sreekanth