linux-kernel - Re: [PATCH 00/13] scsi: Support LUN/target based error handle

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Date:   Wed, 16 Aug 2023 10:14:37 +0800
From:   "haowenchao (C)" <haowenchao2@...wei.com>
To:     Bart Van Assche <bvanassche@....org>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Hannes Reinecke <hare@...e.de>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Dan Carpenter <error27@...il.com>, <louhongxiang@...wei.com>
Subject: Re: [PATCH 00/13] scsi: Support LUN/target based error handle

On 2023/8/15 23:48, Bart Van Assche wrote:
> On 8/15/23 07:17, haowenchao (C) wrote:
>> We can reduce probability of blocking whole host when handle error
>> commands with this patchset, which is important for servers which
>> deploy large scale disks. And the new error handler is not enabled
>> default, so it would not affect drivers which do not need it.
> 
> Which drivers need this new error handler? I don't see any changes for
> SCSI drivers in this patch series other than scsi_debug. Has this patch
> series perhaps been developed for a pass-through driver between virtual
> machine guests and their host? If so, has it been considered to
> configure pass-through such that there is one disk per SCSI host instead
> of multiple?
> 

I tested the error hander with our private hardware(the driver code was
not pushed in mainline), as discussed, megaraid_sas, mpt3sas, smartpqi,
hiraid and hisi_sas need this new error handler too, while hisi_sas
needs more steps to using it because it is tightly coupled with
libsas/libata. I want the basic frame to be reviewed first, so just
modify the scsi_debug, which is accessible for everyone and easy to
simulate various kind of error.

I do not know how pass-through driver between virtual machine guests
and their host work, do you mean virtio-scsi in guests OS?
Can you describe more?

Thanks.

> Thanks,
> 
> Bart.
> 
>