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Subject[PATCH-v5 02/13] iscsi: Add Serial Number Arithmetic LT and GT into iscsi_proto.h
Date
From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch moves the iscsi_sna_lt() and iscsi_sna_lte(), along with
iscsi_sna_gt() and iscsi_sna_gte() from iscsi_target_mod into
static inlines inside of include/scsi/iscsi_proto.h

This patch also includes the ISCSI_HDR_LEN and ISCSI_CRC_LEN
definitions.

Reported-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/scsi/libiscsi.c | 16 ----------------
include/scsi/iscsi_proto.h | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 9c3cb4e..3461a03 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -84,22 +84,6 @@ MODULE_PARM_DESC(debug_libiscsi_eh,
__func__, ##arg); \
} while (0);

-/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
-#define SNA32_CHECK 2147483648UL
-
-static int iscsi_sna_lt(u32 n1, u32 n2)
-{
- return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
- (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
-}
-
-/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
-static int iscsi_sna_lte(u32 n1, u32 n2)
-{
- return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
- (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
-}
-
inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
{
struct Scsi_Host *shost = conn->session->host;
diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
index a9c9058..455b03a 100644
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -29,10 +29,48 @@
/* default iSCSI listen port for incoming connections */
#define ISCSI_LISTEN_PORT 3260

+/* iSCSI header length */
+#define ISCSI_HDR_LEN 48
+
+/* iSCSI CRC32C length */
+#define ISCSI_CRC_LEN 4
+
/* Padding word length */
#define ISCSI_PAD_LEN 4

/*
+ * Serial Number Arithmetic, 32 bits, RFC1982
+ */
+
+static inline int iscsi_sna_lt(u32 n1, u32 n2)
+{
+ s32 diff = n1 - n2;
+
+ return diff < 0;
+}
+
+static inline int iscsi_sna_lte(u32 n1, u32 n2)
+{
+ s32 diff = n1 - n2;
+
+ return diff <= 0;
+}
+
+static inline int iscsi_sna_gt(u32 n1, u32 n2)
+{
+ s32 diff = n1 - n2;
+
+ return diff > 0;
+}
+
+static inline int iscsi_sna_gte(u32 n1, u32 n2)
+{
+ s32 diff = n1 - n2;
+
+ return diff >= 0;
+}
+
+/*
* useful common(control and data pathes) macro
*/
#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
--
1.7.5.1


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