support iscsi task function

pkg/port/iscsit/iscsit.go

@@ -25,6 +25,8 @@ import (
 	"github.com/gostor/gotgt/pkg/api"
 )
 
+const iSCSIDriverName = "iscsi"
+
 const (
 	IOSTATE_FREE = iota
 
@@ -53,7 +55,7 @@ const (
 	IOSTATE_TX_END
 )
 
-var ISCSI_OPCODE_MASK = 0x3F
+var ISCSI_OPCODE_MASK byte = 0x3F
 
 type ISCSIDiscoveryMethod string
 
@@ -95,7 +97,7 @@ type ISCSITarget struct {
 /*
  * RFC 3720 iSCSI SSID = ISID , TPGT
  * ISID is an 6 bytes number, TPGT is an 2 bytes number
- * We combime ISID and TPGT together to be SSID
+ * We combine ISID and TPGT together to be SSID
  */
 func MakeSSID(ISID uint64, TPGT uint16) uint64 {
 	SSID := ISID<<16 | uint64(TPGT)