[SCSI] 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@lsi.com>
Reviewed-by: Yanling Qi <yanling.qi@lsi.com>
Reviewed-by: Sudhir Dachepalli <Sudhir.Dachepalli@lis.com>
Reviewed-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy@lsi.com>
Reviewed-by: Bob Stankey <Robert.Stankey@lsi.com>
Reviewed-by: Vijay Chauhan <Vijay.Chauhan@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 20 insertions, 13 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index afb2fb1a5186..4efe638036f6 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -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_device *sdev, struct rdac_dh_data *h)
         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;
 }