[PATCH net-next 11/15] netvsc: reduce unnecessary memset

[Stephen Hemminger <stephen@networkplumber.org>]

Only part of the headroom maybe used on typical packet. Avoid doing memset
of whole area.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
 drivers/net/hyperv/netvsc_drv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index ef3a3a46790f..d9a690ad7cd5 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -195,6 +195,7 @@ static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
 	ppi->size = ppi_size;
 	ppi->type = pkt_type;
 	ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
+	memset(ppi + 1, 0, ppi_size - sizeof(struct rndis_per_packet_info));
 
 	rndis_pkt->per_pkt_info_len += ppi_size;
 
@@ -461,12 +462,12 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 
 	rndis_msg = (struct rndis_message *)skb->head;
 
-	memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
-
 	/* Add the rndis header */
 	rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 	rndis_msg->msg_len = packet->total_data_buflen;
+
 	rndis_pkt = &rndis_msg->msg.pkt;
+	memset(rndis_pkt, 0, sizeof(*rndis_pkt));
 	rndis_pkt->data_offset = sizeof(struct rndis_packet);
 	rndis_pkt->data_len = packet->total_data_buflen;
 	rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
-- 
2.11.0