# Re: \[PATCH 5/8\] vhost scsi: add lun parser helper

- From: Paolo Bonzini \<pbonzini@redhat.com\>
- Date: 2020-09-23 10:23:19 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2020/09/6740497
- Thread: https://ratatoskr.run/linux-scsi/2020/09/6740440/t.md

```text
On 21/09/20 20:23, Mike Christie wrote:
> Move code to parse lun from req's lun_buf to helper, so tmf code
> can use it in the next patch.
> 
> Signed-off-by: Mike Christie <michael.christie@oracle.com>
> ---
>  drivers/vhost/scsi.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
> index 26d0f75..736ce19 100644
> --- a/drivers/vhost/scsi.c
> +++ b/drivers/vhost/scsi.c
> @@ -899,6 +899,11 @@ static void vhost_scsi_submission_work(struct work_struct *work)
>  	return ret;
>  }
>  
> +static u16 vhost_buf_to_lun(u8 *lun_buf)
> +{
> +	return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF;
> +}
> +
>  static void
>  vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
>  {
> @@ -1037,12 +1042,12 @@ static void vhost_scsi_submission_work(struct work_struct *work)
>  			tag = vhost64_to_cpu(vq, v_req_pi.tag);
>  			task_attr = v_req_pi.task_attr;
>  			cdb = &v_req_pi.cdb[0];
> -			lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
> +			lun = vhost_buf_to_lun(v_req_pi.lun);
>  		} else {
>  			tag = vhost64_to_cpu(vq, v_req.tag);
>  			task_attr = v_req.task_attr;
>  			cdb = &v_req.cdb[0];
> -			lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
> +			lun = vhost_buf_to_lun(v_req.lun);
>  		}
>  		/*
>  		 * Check that the received CDB size does not exceeded our
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
```