linux-kernel - Re: [REQUEST DISCUSS]: speed up SCSI error handle for host with massive devices

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Message-ID: <84b38f16-2a32-f361-43e5-34bce1012e71@oracle.com>
Date:   Sun, 3 Apr 2022 12:17:05 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     Wenchao Hao <haowenchao@...wei.com>,
        Hannes Reinecke <hare@...e.de>,
        Steffen Maier <maier@...ux.ibm.com>,
        linux-scsi@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Lee Duncan <lduncan@...e.com>,
        John Garry <john.garry@...wei.com>
Cc:     Wu Bo <wubo40@...wei.com>, Feilong Lin <linfeilong@...wei.com>,
        zhangjian013@...wei.com
Subject: Re: [REQUEST DISCUSS]: speed up SCSI error handle for host with
 massive devices

On 4/3/22 12:14 PM, Mike Christie wrote:
> We could share code with scsi_ioctl_reset as well. Drivers that support
> TMFs via that ioctl already expect queuecommand to be possibly in the
> middle of a run and IO not yet timed out. For example, the code to
> block a queue and reset the device could be used for the new EH and
> SG_SCSI_RESET_DEVICE handling.
> 

Hannes or others,

How do parallel SCSI drivers support scsi_ioctl_reset? Is is not fully
supported and more only used for controlled testing?