[SCSI] libiscsi: fix cmds_max setting

Drivers expect that the cmds_max value they pass to the iscsi layer
is the max scsi commands  + mgmt tasks. This patch implements that
and fixes some checks for nr cmd limits.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 21cfb1d5483f..5bf0187e7520 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -52,9 +52,7 @@ struct device;
 #endif
 
 #define ISCSI_DEF_XMIT_CMDS_MAX 128     /* must be power of 2 */
-#define ISCSI_MGMT_CMDS_MAX     16      /* must be power of 2 */
-
-#define ISCSI_MGMT_ITT_OFFSET   0xa00
+#define ISCSI_MGMT_CMDS_MAX     15
 
 #define ISCSI_DEF_CMD_PER_LUN           32
 #define ISCSI_MAX_CMD_PER_LUN           128
@@ -72,7 +70,10 @@ enum {
 /* Connection suspend "bit" */
 #define ISCSI_SUSPEND_BIT               1
 
-#define ISCSI_ITT_MASK                  (0xfff)
+#define ISCSI_ITT_MASK                  (0x1fff)
+#define ISCSI_TOTAL_CMDS_MAX            4096
+/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
+#define ISCSI_TOTAL_CMDS_MIN            16
 #define ISCSI_AGE_SHIFT                 28
 #define ISCSI_AGE_MASK                  (0xf << ISCSI_AGE_SHIFT)