[SCSI] add SCSI_UNKNOWN and LUN transfer limit restrictions

Original From: Ingo Flaschberger <if@xip.at>

To support the RA4100 array from Compaq.

This patch now correctly handles SCSI_UNKNOWN types with regard to
BLIST_REPORTLUNS2 (allow it) and cdb[1] LUN inclusion (don't).

It also allows a BLIST_MAX_512 flag to restrict the maximum transfer
length to 512 blocks (apparently this is an RA4100 problem).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 32979fe..73994e2 100644 (file)
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -565,7 +565,8 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
        /* 
         * If SCSI-2 or lower, store the LUN value in cmnd.
         */
-       if (cmd->device->scsi_level <= SCSI_2) {
+       if (cmd->device->scsi_level <= SCSI_2 &&
+           cmd->device->scsi_level != SCSI_UNKNOWN) {
                cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
                               (cmd->device->lun << 5 & 0xe0);
        }

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 84c3937..c750d33 100644 (file)
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -132,7 +132,9 @@ static struct {
        {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
        {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
        {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
-       {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN},
+       {"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
+               BLIST_MAX_512 | BLIST_REPORTLUN2},      /* Compaq RA4x00 */
+       {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
        {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
        {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
        {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f149459..1a5474b 100644 (file)
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -673,6 +673,7 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
        case TYPE_MEDIUM_CHANGER:
        case TYPE_ENCLOSURE:
        case TYPE_COMM:
+       case TYPE_RAID:
        case TYPE_RBC:
                sdev->writeable = 1;
                break;
@@ -737,6 +738,13 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
        if (*bflags & BLIST_SELECT_NO_ATN)
                sdev->select_no_atn = 1;
 
+       /*
+        * Maximum 512 sector transfer length
+        * broken RA4x00 Compaq Disk Array
+        */
+       if (*bflags & BLIST_MAX_512)
+               blk_queue_max_sectors(sdev->request_queue, 512);
+
        /*
         * Some devices may not want to have a start command automatically
         * issued when a device is added.
@@ -1123,10 +1131,13 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
         * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
         * support more than 8 LUNs.
         */
-       if ((bflags & BLIST_NOREPORTLUN) || 
-            starget->scsi_level < SCSI_2 ||
-           (starget->scsi_level < SCSI_3 && 
-            (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) )
+       if (bflags & BLIST_NOREPORTLUN)
+               return 1;
+       if (starget->scsi_level < SCSI_2 &&
+           starget->scsi_level != SCSI_UNKNOWN)
+               return 1;
+       if (starget->scsi_level < SCSI_3 &&
+           (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
                return 1;
        if (bflags & BLIST_NOLUN)
                return 0;

diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
index 174101b..d31b16d 100644 (file)
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -28,4 +28,5 @@
 #define BLIST_NO_ULD_ATTACH    0x100000 /* device is actually for RAID config */
 #define BLIST_SELECT_NO_ATN    0x200000 /* select without ATN */
 #define BLIST_RETRY_HWERROR    0x400000 /* retry HARDWARE_ERROR */
+#define BLIST_MAX_512          0x800000 /* maximum 512 sector cdb length */
 #endif