OS-7088 cyclics corked on overlay socket with full queue

@@ -95,11 +95,12 @@
         OVERLAY_F_IOMASK        = 0x0c, /* A mask for rx and tx */
         OVERLAY_F_MDDROP        = 0x10, /* Drop traffic for metadata update */
         OVERLAY_F_STOPMASK      = 0x1e, /* None set when stopping */
         OVERLAY_F_VARPD         = 0x20, /* varpd plugin exists */
         OVERLAY_F_DEGRADED      = 0x40, /* device is degraded */
-        OVERLAY_F_MASK          = 0x7f  /* mask of everything */
+        OVERLAY_F_TXSTOPPED     = 0x80, /* device needs max_tx_update */
+        OVERLAY_F_MASK          = 0xff  /* mask of everything */
 } overlay_dev_flag_t;
 
 typedef struct overlay_dev {
         kmutex_t        odd_lock;
         kcondvar_t      odd_iowait;