iscsi-target: add int (*iscsit_xmit_pdu)()

Add int (*iscsit_xmit_pdu)() to
struct iscsit_transport, iscsi-target
uses this callback to transmit an
iSCSI PDU.

cxgbit.ko needs this callback to
avoid duplicating iscsit_immediate_queue()
and iscsit_response_queue() code.
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

include/target/iscsi/iscsi_transport.h

@@ -22,6 +22,8 @@ struct iscsit_transport {
 	int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
 	int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
 	void (*iscsit_aborted_task)(struct iscsi_conn *, struct iscsi_cmd *);
+	int (*iscsit_xmit_pdu)(struct iscsi_conn *, struct iscsi_cmd *,
+			       struct iscsi_datain_req *, const void *, u32);
 	enum target_prot_op (*iscsit_get_sup_prot_ops)(struct iscsi_conn *);
 };