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diff --git a/include/scsi/scsi_tgt_if.h b/include/scsi/scsi_tgt_if.h
new file mode 100644
index 000000000..46d5e70d7
--- /dev/null
+++ b/include/scsi/scsi_tgt_if.h
@@ -0,0 +1,90 @@
+/*
+ * SCSI target kernel/user interface
+ *
+ * Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
+ * Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#ifndef __SCSI_TARGET_IF_H
+#define __SCSI_TARGET_IF_H
+
+/* user -> kernel */
+#define	TGT_UEVENT_CMD_RSP	0x0001
+#define	TGT_UEVENT_TSK_MGMT_RSP	0x0002
+
+/* kernel -> user */
+#define	TGT_KEVENT_CMD_REQ	0x1001
+#define	TGT_KEVENT_CMD_DONE	0x1002
+#define	TGT_KEVENT_TSK_MGMT_REQ	0x1003
+
+struct tgt_event_hdr {
+	uint16_t version;
+	uint16_t status;
+	uint16_t type;
+	uint16_t len;
+} __attribute__ ((aligned (sizeof(uint64_t))));
+
+struct tgt_event {
+	struct tgt_event_hdr hdr;
+
+	union {
+		/* user-> kernel */
+		struct {
+			int host_no;
+			uint32_t len;
+			int result;
+			aligned_u64 uaddr;
+			uint8_t rw;
+			aligned_u64 tag;
+		} cmd_rsp;
+		struct {
+			int host_no;
+			aligned_u64 mid;
+			int result;
+		} tsk_mgmt_rsp;
+
+
+		/* kernel -> user */
+		struct {
+			int host_no;
+			uint32_t data_len;
+			uint8_t scb[16];
+			uint8_t lun[8];
+			int attribute;
+			aligned_u64 tag;
+		} cmd_req;
+		struct {
+			int host_no;
+			aligned_u64 tag;
+			int result;
+		} cmd_done;
+		struct {
+			int host_no;
+			int function;
+			aligned_u64 tag;
+			uint8_t lun[8];
+			aligned_u64 mid;
+		} tsk_mgmt_req;
+	} p;
+} __attribute__ ((aligned (sizeof(uint64_t))));
+
+#define TGT_RING_SIZE (1UL << 16)
+#define TGT_RING_PAGES (TGT_RING_SIZE >> PAGE_SHIFT)
+#define TGT_EVENT_PER_PAGE (PAGE_SIZE / sizeof(struct tgt_event))
+#define TGT_MAX_EVENTS (TGT_EVENT_PER_PAGE * TGT_RING_PAGES)
+
+#endif