Re: [PATCH] scsi: Allow activation of scsi-mq per-driver

[Hannes Reinecke <hare@suse.de>]

On 01/22/2016 02:41 PM, Johannes Thumshirn wrote:
> Allow the activation of the scsi-mq feature on a per-driver bassis as opposed
> to the current stack global (de)activation.
> 
> This allows us to have setups which can combine "slow" rotational media and
> fast media on two different HBA types.
> 
> The following is from a host with rotational disks behind a HP SAS Adapter and
> a fibre channel array behind a Emulex FC Adapter. The hpsa driver does not
> support scsi-mq yet (and has rotational disks attached to it), but the lpfc
> does. This patch allows an optimal combination of the scsi-mq enabled lpfc
> driver and the hpsa driver which still uses a single queue scsi layer and thus
> can make use of IO schedulers.
> 
> host:~ # cat /sys/block/sd?/queue/scheduler
> noop deadline [cfq]
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> none
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
> ---
>  drivers/scsi/fnic/fnic_main.c | 10 ++++++++++
>  drivers/scsi/hosts.c          |  2 +-
>  drivers/scsi/lpfc/lpfc_init.c |  8 ++++++++
>  drivers/scsi/virtio_scsi.c    | 11 +++++++++++
>  include/scsi/scsi_host.h      |  3 ---
>  5 files changed, 30 insertions(+), 4 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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