Latency improvement related to NAPI conversion.
If all packets are processed from receive ring then need
to signal host.
Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>
---
drivers/net/hyperv/netvsc.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 03c1fec762c7..f5d7cae6ba70 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1189,10 +1189,15 @@ int netvsc_poll(struct napi_struct *napi, int budget)
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(net_device, channel, q_idx) == 0 &&
work_done < budget &&
--
2.11.0
