netvsc: signal host if receive ring is emptied
Latency improvement related to NAPI conversion.
If all packets are processed from receive ring then need
to signal host.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index db95487..c64934c 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1195,10 +1195,15 @@
nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
}
- /* If send of pending receive completions suceeded
- * and did not exhaust NAPI budget
+ /* if ring is empty, signal host */
+ if (!nvchan->desc)
+ hv_pkt_iter_close(channel);
+
+ /* If send of pending receive completions suceeded
+ * and did not exhaust NAPI budget this time
* and not doing busy poll
- * then reschedule if more data has arrived from host
+ * then re-enable host interrupts
+ * and reschedule if ring is not empty.
*/
if (send_recv_completions(nvchan) == 0 &&
work_done < budget &&