[dm-devel] [PATCH 2/3] scsi_dh_rdac : Detect the different RDAC operating modes
Moger, Babu
Babu.Moger at lsi.com
Wed Apr 20 15:10:45 UTC 2011
> -----Original Message-----
> From: linux-scsi-owner at vger.kernel.org [mailto:linux-scsi-
> owner at vger.kernel.org] On Behalf Of Moger, Babu
> Sent: Friday, April 08, 2011 12:39 PM
> To: linux-scsi at vger.kernel.org; device-mapper development
> Cc: Qi, Yanling; Chauhan, Vijay; Stankey, Robert; Arumugam, Anburaja;
> Krishnasamy, Somasundaram; Dachepalli, Sudhir
> Subject: [PATCH 2/3] scsi_dh_rdac : Detect the different RDAC operating
> modes
>
> This patch detects different operating RDAC modes during the discovery.
> It also collects the information about
> the preferred path.
>
> Signed-off-by: Babu Moger <babu.moger at lsi.com>
> Reviewed-by: Yanling Qi <yanling.qi at lsi.com>
> Reviewed-by: Sudhir Dachepalli <Sudhir.Dachepalli at lis.com>
> Reviewed-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy at lsi.com>
> Reviewed-by: Bob Stankey <Robert.Stankey at lsi.com>
> Reviewed-by: Vijay Chauhan <Vijay.Chauhan at lsi.com>
Tested-by: Charles Cummins <Charles.cummins at lsi.com>
>
> ---
> --- linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c.orig 2011-
> 03-17 16:51:40.000000000 -0500
> +++ linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c 2011-03-17
> 16:53:33.000000000 -0500
> @@ -194,7 +194,6 @@ struct rdac_dh_data {
>
> #define RDAC_LUN_UNOWNED 0
> #define RDAC_LUN_OWNED 1
> -#define RDAC_LUN_AVT 2
> char lun_state;
>
> #define RDAC_PREFERRED 0
> @@ -473,25 +472,33 @@ static int check_ownership(struct scsi_d
> int err;
> struct c9_inquiry *inqp;
>
> - h->lun_state = RDAC_LUN_UNOWNED;
> h->state = RDAC_STATE_ACTIVE;
> err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
> if (err == SCSI_DH_OK) {
> inqp = &h->inq.c9;
> - if ((inqp->avte_cvp >> 7) == 0x1) {
> - /* LUN in AVT mode */
> - sdev_printk(KERN_NOTICE, sdev,
> - "%s: AVT mode detected\n",
> - RDAC_NAME);
> - h->lun_state = RDAC_LUN_AVT;
> - } else if ((inqp->avte_cvp & 0x1) != 0) {
> - /* LUN was owned by the controller */
> + /* detect the operating mode */
> + if ((inqp->avte_cvp >> 5) & 0x1)
> + h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
> + else if (inqp->avte_cvp >> 7)
> + h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
> + else
> + h->mode = RDAC_MODE; /* LUN in RDAC mode */
> +
> + /* Update ownership */
> + if (inqp->avte_cvp & 0x1)
> h->lun_state = RDAC_LUN_OWNED;
> + else {
> + h->lun_state = RDAC_LUN_UNOWNED;
> + if (h->mode == RDAC_MODE)
> + h->state = RDAC_STATE_PASSIVE;
> }
> - }
>
> - if (h->lun_state == RDAC_LUN_UNOWNED)
> - h->state = RDAC_STATE_PASSIVE;
> + /* Update path prio*/
> + if (inqp->path_prio & 0x1)
> + h->preferred = RDAC_PREFERRED;
> + else
> + h->preferred = RDAC_NON_PREFERRED;
> + }
>
> return err;
> }
>
>
> --
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