From: Mike Christie <michaelc@xxxxxxxxxxx>
The session age mask is only 4 bits, but session->age is 32. When
it gets larger then 15 and we try to or the bits some bits get
dropped and the check for session age in iscsi_verify_itt is useless.
The ISCSI_CID_MASK related bits are also useless since cid is always
one.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/libiscsi.c | 14 ++++----------
include/scsi/iscsi_proto.h | 4 ++--
include/scsi/libiscsi.h | 2 --
3 files changed, 6 insertions(+), 14 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index c76bd5c..cfffabd 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -160,7 +160,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
hdr->opcode = ISCSI_OP_SCSI_CMD;
hdr->flags = ISCSI_ATTR_SIMPLE;
int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
- hdr->itt = build_itt(ctask->itt, conn->id, session->age);
+ hdr->itt = build_itt(ctask->itt, session->age);
hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
hdr->cmdsn = cpu_to_be32(session->cmdsn);
session->cmdsn++;
@@ -706,14 +706,6 @@ int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
return ISCSI_ERR_BAD_ITT;
}
- if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
- (conn->id << ISCSI_CID_SHIFT)) {
- iscsi_conn_printk(KERN_ERR, conn,
- "iscsi: received itt %x, expected "
- "CID (%x)\n",
- (__force u32)hdr->itt, conn->id);
- return ISCSI_ERR_BAD_ITT;
- }
itt = get_itt(hdr->itt);
} else
itt = ~0U;
@@ -777,7 +769,7 @@ static void iscsi_prep_mtask(struct iscsi_conn *conn,
*/
nop->cmdsn = cpu_to_be32(session->cmdsn);
if (hdr->itt != RESERVED_ITT) {
- hdr->itt = build_itt(mtask->itt, conn->id, session->age);
+ hdr->itt = build_itt(mtask->itt, session->age);
/*
* TODO: We always use immediate, so we never hit this.
* If we start to send tmfs or nops as non-immediate then
@@ -2037,6 +2029,8 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
conn->stop_stage = 0;
conn->tmf_state = TMF_INITIAL;
session->age++;
+ if (session->age == 16)
+ session->age = 0;
break;
case STOP_CONN_TERM:
conn->stop_stage = 0;
diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
index 318a909..5ffec8a 100644
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -45,8 +45,8 @@
/* initiator tags; opaque for target */
typedef uint32_t __bitwise__ itt_t;
/* below makes sense only for initiator that created this tag */
-#define build_itt(itt, id, age) ((__force itt_t)\
- ((itt) | ((id) << ISCSI_CID_SHIFT) | ((age) << ISCSI_AGE_SHIFT)))
+#define build_itt(itt, age) ((__force itt_t)\
+ ((itt) | ((age) << ISCSI_AGE_SHIFT)))
#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
#define RESERVED_ITT ((__force itt_t)0xffffffff)
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 5daa83c..9b955a9 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -70,8 +70,6 @@ enum {
#define ISCSI_SUSPEND_BIT 1
#define ISCSI_ITT_MASK (0xfff)
-#define ISCSI_CID_SHIFT 12
-#define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT)
#define ISCSI_AGE_SHIFT 28
#define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT)
--
1.5.2.1
-
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