hv_netvsc: avoid repeated updates of packet filter
The netvsc driver can get repeated calls to netvsc_rx_mode during
network setup; each of these calls ends up scheduling the lower
layers to update tha packet filter. This update requires an
request/response to the host. So avoid doing this if we already
know that the correct packet filter value is set.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 0db3bd1..cd538d5 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -173,6 +173,7 @@ struct rndis_device {
struct list_head req_list;
struct work_struct mcast_work;
+ u32 filter;
bool link_state; /* 0 - link up, 1 - link down */
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 411a3ae..00ec80c 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -825,13 +825,15 @@ static int rndis_filter_set_packet_filter(struct rndis_device *dev,
struct rndis_set_request *set;
int ret;
+ if (dev->filter == new_filter)
+ return 0;
+
request = get_rndis_request(dev, RNDIS_MSG_SET,
RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
sizeof(u32));
if (!request)
return -ENOMEM;
-
/* Setup the rndis set */
set = &request->request_msg.msg.set_req;
set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
@@ -842,8 +844,10 @@ static int rndis_filter_set_packet_filter(struct rndis_device *dev,
&new_filter, sizeof(u32));
ret = rndis_filter_send_request(dev, request);
- if (ret == 0)
+ if (ret == 0) {
wait_for_completion(&request->wait_event);
+ dev->filter = new_filter;
+ }
put_rndis_request(dev, request);