diff --git a/sys/dev/iscsi/iscsi.c b/sys/dev/iscsi/iscsi.c
index 5fa3bdb9dff..c0fa3115d64 100644
--- a/sys/dev/iscsi/iscsi.c
+++ b/sys/dev/iscsi/iscsi.c
@@ -1427,6 +1427,7 @@ iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc,
 	    sizeof(is->is_target_alias));
 	is->is_tsih = handoff->idh_tsih;
 	is->is_statsn = handoff->idh_statsn;
+	is->is_protocol_level = handoff->idh_protocol_level;
 	is->is_initial_r2t = handoff->idh_initial_r2t;
 	is->is_immediate_data = handoff->idh_immediate_data;
 
diff --git a/sys/dev/iscsi/iscsi.h b/sys/dev/iscsi/iscsi.h
index b6e774f2ae9..607d0a7386f 100644
--- a/sys/dev/iscsi/iscsi.h
+++ b/sys/dev/iscsi/iscsi.h
@@ -61,8 +61,7 @@ struct iscsi_session {
 	uint32_t			is_expcmdsn;
 	uint32_t			is_maxcmdsn;
 	uint32_t			is_initiator_task_tag;
-	int				is_header_digest;
-	int				is_data_digest;
+	int				is_protocol_level;
 	int				is_initial_r2t;
 	int				is_max_burst_length;
 	int				is_first_burst_length;
diff --git a/sys/dev/iscsi/iscsi_ioctl.h b/sys/dev/iscsi/iscsi_ioctl.h
index ef31d31fe41..27c51c12736 100644
--- a/sys/dev/iscsi/iscsi_ioctl.h
+++ b/sys/dev/iscsi/iscsi_ioctl.h
@@ -124,7 +124,8 @@ struct iscsi_daemon_handoff {
 	unsigned int			idh_session_id;
 	int				idh_socket;
 	char				idh_target_alias[ISCSI_ALIAS_LEN];
-	uint8_t				idh_spare_isid[6];
+	int				idh_protocol_level;
+	uint16_t			idh_spare;
 	uint16_t			idh_tsih;
 	uint16_t			idh_spare_cid;
 	uint32_t			idh_statsn;
diff --git a/sys/dev/iscsi/iscsi_proto.h b/sys/dev/iscsi/iscsi_proto.h
index 9ec24f46425..cde594f863f 100644
--- a/sys/dev/iscsi/iscsi_proto.h
+++ b/sys/dev/iscsi/iscsi_proto.h
@@ -90,10 +90,14 @@ CTASSERT(sizeof(struct iscsi_bhs) == ISCSI_BHS_SIZE);
 #define	BHSSC_FLAGS_ATTR_HOQ		3
 #define	BHSSC_FLAGS_ATTR_ACA		4
 
+#define	BHSSC_PRI_MASK		0xf0
+#define	BHSSC_PRI_SHIFT		4
+
 struct iscsi_bhs_scsi_command {
 	uint8_t		bhssc_opcode;
 	uint8_t		bhssc_flags;
-	uint8_t		bhssc_reserved[2];
+	uint8_t		bhssc_pri;
+	uint8_t		bhssc_reserved;
 	uint8_t		bhssc_total_ahs_len;
 	uint8_t		bhssc_data_segment_len[3];
 	uint64_t	bhssc_lun;
diff --git a/usr.sbin/iscsid/iscsid.c b/usr.sbin/iscsid/iscsid.c
index 5d121e83b15..92c3cddba57 100644
--- a/usr.sbin/iscsid/iscsid.c
+++ b/usr.sbin/iscsid/iscsid.c
@@ -172,6 +172,7 @@ connection_new(int iscsi_fd, const struct iscsi_daemon_request *request)
 	/*
 	 * Default values, from RFC 3720, section 12.
 	 */
+	conn->conn_protocol_level = 0;
 	conn->conn_header_digest = CONN_DIGEST_NONE;
 	conn->conn_data_digest = CONN_DIGEST_NONE;
 	conn->conn_initial_r2t = true;
@@ -329,6 +330,7 @@ handoff(struct connection *conn)
 	    sizeof(idh.idh_target_alias));
 	idh.idh_tsih = conn->conn_tsih;
 	idh.idh_statsn = conn->conn_statsn;
+	idh.idh_protocol_level = conn->conn_protocol_level;
 	idh.idh_header_digest = conn->conn_header_digest;
 	idh.idh_data_digest = conn->conn_data_digest;
 	idh.idh_initial_r2t = conn->conn_initial_r2t;
diff --git a/usr.sbin/iscsid/iscsid.h b/usr.sbin/iscsid/iscsid.h
index e1a5e92113d..93d74178252 100644
--- a/usr.sbin/iscsid/iscsid.h
+++ b/usr.sbin/iscsid/iscsid.h
@@ -57,6 +57,7 @@ struct connection {
 	uint8_t			conn_isid[6];
 	uint16_t		conn_tsih;
 	uint32_t		conn_statsn;
+	int			conn_protocol_level;
 	int			conn_header_digest;
 	int			conn_data_digest;
 	bool			conn_initial_r2t;
diff --git a/usr.sbin/iscsid/login.c b/usr.sbin/iscsid/login.c
index 112c97e4897..cfb370bba28 100644
--- a/usr.sbin/iscsid/login.c
+++ b/usr.sbin/iscsid/login.c
@@ -341,6 +341,11 @@ login_negotiate_key(struct connection *conn, const char *name,
 		    sizeof(conn->conn_target_alias));
 	} else if (strcmp(value, "Irrelevant") == 0) {
 		/* Ignore. */
+	} else if (strcmp(name, "iSCSIProtocolLevel") == 0) {
+		tmp = strtoul(value, NULL, 10);
+		if (tmp < 0 || tmp > 31)
+			log_errx(1, "received invalid iSCSIProtocolLevel");
+		conn->conn_protocol_level = tmp;
 	} else if (strcmp(name, "HeaderDigest") == 0) {
 		which = login_list_prefers(value, "CRC32C", "None");
 		switch (which) {
@@ -500,6 +505,7 @@ login_negotiate(struct connection *conn)
 	 * The following keys are irrelevant for discovery sessions.
 	 */
 	if (conn->conn_conf.isc_discovery == 0) {
+		keys_add(request_keys, "iSCSIProtocolLevel", "2");
 		if (conn->conn_conf.isc_header_digest != 0)
 			keys_add(request_keys, "HeaderDigest", "CRC32C");
 		else