[04/20] mptfusion: correct definitions for mptscsih_dev_reset()

From: Hannes Reinecke <hare@suse.com>

mptscsih_dev_reset() is _not_ a device reset, but rather a
target reset. Nevertheless it's being used for either purpose.
This patch adds a correct implementation for mptscsih_dev_reset(),
and renames the original function to mptscsih_target_reset().

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 drivers/message/fusion/mptscsih.c | 55 ++++++++++++++++++++++++++++++-
 drivers/message/fusion/mptscsih.h |  1 +
 2 files changed, 55 insertions(+), 1 deletion(-)

This patch appears to change the EH activity from issuing a target
reset to a LUN reset only
(since it does not add an entry in the host templates for
.eh_target_reset_handler to invoke
the new mptscsih_target_reset() function, nor does any other patch in
the series).

Is this going to work properly, and without escalating to a host reset
which might not have happened before?

-Ewan

On Thu, May 12, 2022 at 7:13 AM Hannes Reinecke <hare@suse.de> wrote:
>
> From: Hannes Reinecke <hare@suse.com>
>
> mptscsih_dev_reset() is _not_ a device reset, but rather a
> target reset. Nevertheless it's being used for either purpose.
> This patch adds a correct implementation for mptscsih_dev_reset(),
> and renames the original function to mptscsih_target_reset().
>
> Signed-off-by: Hannes Reinecke <hare@suse.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> ---
>  drivers/message/fusion/mptscsih.c | 55 ++++++++++++++++++++++++++++++-
>  drivers/message/fusion/mptscsih.h |  1 +
>  2 files changed, 55 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
> index 276084ed04a6..ed21cc4d2c77 100644
> --- a/drivers/message/fusion/mptscsih.c
> +++ b/drivers/message/fusion/mptscsih.c
> @@ -1794,7 +1794,7 @@ mptscsih_abort(struct scsi_cmnd * SCpnt)
>
>  /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
>  /**
> - *     mptscsih_dev_reset - Perform a SCSI TARGET_RESET!  new_eh variant
> + *     mptscsih_dev_reset - Perform a SCSI LOGICAL_UNIT_RESET!
>   *     @SCpnt: Pointer to scsi_cmnd structure, IO which reset is due to
>   *
>   *     (linux scsi_host_template.eh_dev_reset_handler routine)
> @@ -1809,6 +1809,58 @@ mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
>         VirtDevice       *vdevice;
>         MPT_ADAPTER     *ioc;
>
> +       /* If we can't locate our host adapter structure, return FAILED status.
> +        */
> +       if ((hd = shost_priv(SCpnt->device->host)) == NULL){
> +               printk(KERN_ERR MYNAM ": lun reset: "
> +                  "Can't locate host! (sc=%p)\n", SCpnt);
> +               return FAILED;
> +       }
> +
> +       ioc = hd->ioc;
> +       printk(MYIOC_s_INFO_FMT "attempting lun reset! (sc=%p)\n",
> +              ioc->name, SCpnt);
> +       scsi_print_command(SCpnt);
> +
> +       vdevice = SCpnt->device->hostdata;
> +       if (!vdevice || !vdevice->vtarget) {
> +               retval = 0;
> +               goto out;
> +       }
> +
> +       retval = mptscsih_IssueTaskMgmt(hd,
> +                               MPI_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET,
> +                               vdevice->vtarget->channel,
> +                               vdevice->vtarget->id, vdevice->lun, 0,
> +                               mptscsih_get_tm_timeout(ioc));
> +
> + out:
> +       printk (MYIOC_s_INFO_FMT "lun reset: %s (sc=%p)\n",
> +           ioc->name, ((retval == 0) ? "SUCCESS" : "FAILED" ), SCpnt);
> +
> +       if (retval == 0)
> +               return SUCCESS;
> +       else
> +               return FAILED;
> +}
> +
> +/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
> +/**
> + *     mptscsih_target_reset - Perform a SCSI TARGET_RESET!
> + *     @SCpnt: Pointer to scsi_cmnd structure, IO which reset is due to
> + *
> + *     (linux scsi_host_template.eh_target_reset_handler routine)
> + *
> + *     Returns SUCCESS or FAILED.
> + **/
> +int
> +mptscsih_target_reset(struct scsi_cmnd * SCpnt)
> +{
> +       MPT_SCSI_HOST   *hd;
> +       int              retval;
> +       VirtDevice       *vdevice;
> +       MPT_ADAPTER     *ioc;
> +
>         /* If we can't locate our host adapter structure, return FAILED status.
>          */
>         if ((hd = shost_priv(SCpnt->device->host)) == NULL){
> @@ -3257,6 +3309,7 @@ EXPORT_SYMBOL(mptscsih_slave_destroy);
>  EXPORT_SYMBOL(mptscsih_slave_configure);
>  EXPORT_SYMBOL(mptscsih_abort);
>  EXPORT_SYMBOL(mptscsih_dev_reset);
> +EXPORT_SYMBOL(mptscsih_target_reset);
>  EXPORT_SYMBOL(mptscsih_bus_reset);
>  EXPORT_SYMBOL(mptscsih_host_reset);
>  EXPORT_SYMBOL(mptscsih_bios_param);
> diff --git a/drivers/message/fusion/mptscsih.h b/drivers/message/fusion/mptscsih.h
> index a22c5eaf703c..e3d92c392673 100644
> --- a/drivers/message/fusion/mptscsih.h
> +++ b/drivers/message/fusion/mptscsih.h
> @@ -120,6 +120,7 @@ extern void mptscsih_slave_destroy(struct scsi_device *device);
>  extern int mptscsih_slave_configure(struct scsi_device *device);
>  extern int mptscsih_abort(struct scsi_cmnd * SCpnt);
>  extern int mptscsih_dev_reset(struct scsi_cmnd * SCpnt);
> +extern int mptscsih_target_reset(struct scsi_cmnd * SCpnt);
>  extern int mptscsih_bus_reset(struct scsi_cmnd * SCpnt);
>  extern int mptscsih_host_reset(struct scsi_cmnd *SCpnt);
>  extern int mptscsih_bios_param(struct scsi_device * sdev, struct block_device *bdev, sector_t capacity, int geom[]);
> --
> 2.29.2
>

On 5/19/22 19:27, Ewan Milne wrote:
> This patch appears to change the EH activity from issuing a target
> reset to a LUN reset only
> (since it does not add an entry in the host templates for
> .eh_target_reset_handler to invoke
> the new mptscsih_target_reset() function, nor does any other patch in
> the series).
> 
> Is this going to work properly, and without escalating to a host reset
> which might not have happened before?
> 
You are correct, the drivers need to be changed to refer to target_reset 
now. Will be fixing it with the next version.

Cheers,

Hannes