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Index: head/sys/dev/hyperv/include/vmbus.h
===================================================================
--- head/sys/dev/hyperv/include/vmbus.h
+++ head/sys/dev/hyperv/include/vmbus.h
@@ -173,5 +173,7 @@
vmbus_chan_guid_inst(const struct vmbus_channel *chan);
int vmbus_chan_prplist_nelem(int br_size, int prpcnt_max,
int dlen_max);
+bool vmbus_chan_rx_empty(const struct vmbus_channel *chan);
+bool vmbus_chan_tx_empty(const struct vmbus_channel *chan);
#endif /* !_VMBUS_H_ */
Index: head/sys/dev/hyperv/vmbus/vmbus_brvar.h
===================================================================
--- head/sys/dev/hyperv/vmbus/vmbus_brvar.h
+++ head/sys/dev/hyperv/vmbus/vmbus_brvar.h
@@ -83,6 +83,20 @@
return (tbr->txbr_dsize - sizeof(uint64_t) - 1);
}
+static __inline bool
+vmbus_txbr_empty(const struct vmbus_txbr *tbr)
+{
+
+ return (tbr->txbr_windex == tbr->txbr_rindex ? true : false);
+}
+
+static __inline bool
+vmbus_rxbr_empty(const struct vmbus_rxbr *rbr)
+{
+
+ return (rbr->rxbr_windex == rbr->rxbr_rindex ? true : false);
+}
+
static __inline int
vmbus_br_nelem(int br_size, int elem_size)
{
Index: head/sys/dev/hyperv/vmbus/vmbus_chan.c
===================================================================
--- head/sys/dev/hyperv/vmbus/vmbus_chan.c
+++ head/sys/dev/hyperv/vmbus/vmbus_chan.c
@@ -1692,3 +1692,17 @@
return (vmbus_br_nelem(br_size, elem_size));
}
+
+bool
+vmbus_chan_tx_empty(const struct vmbus_channel *chan)
+{
+
+ return (vmbus_txbr_empty(&chan->ch_txbr));
+}
+
+bool
+vmbus_chan_rx_empty(const struct vmbus_channel *chan)
+{
+
+ return (vmbus_rxbr_empty(&chan->ch_rxbr));
+}

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