pdu: introduce ISCSI_PDU_URGENT_DELIVERY

Signed-off-by: Peter Lieven <pl@kamp.de>

include/iscsi-private.h

@@ -212,6 +212,11 @@ struct iscsi_pdu {
 #define ISCSI_PDU_DROP_ON_RECONNECT	0x00000004
 /* stop sending after this PDU has been sent */
 #define ISCSI_PDU_CORK_WHEN_SENT	0x00000008
+/* put this immediate delivery PDU in front of outqueue.
+ * This is currently only used for immediate logout requests
+ * as answer to an async logout event. */
+#define ISCSI_PDU_URGENT_DELIVERY	0x00000010
+
 
 	uint32_t flags;
 

lib/socket.c

@@ -94,7 +94,8 @@ iscsi_add_to_outqueue(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
 	 * ensure that pakets with the same CmdSN are kept in FIFO order.
 	 */
 	do {
-		if (iscsi_serial32_compare(pdu->cmdsn, current->cmdsn) < 0) {
+		if (iscsi_serial32_compare(pdu->cmdsn, current->cmdsn) < 0 ||
+			pdu->flags & ISCSI_PDU_URGENT_DELIVERY) {
 			/* insert PDU before the current */
 			if (last != NULL) {
 				last->next=pdu;