1 files changed, 21 insertions, 44 deletions

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 643c539a08ba..63c98bbbc596 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -37,6 +37,8 @@
 #include <net/route.h>
 #include <net/sock.h>
 #include <net/pkt_sched.h>
+#include <net/checksum.h>
+#include <net/ip6_checksum.h>
 
 #include "hyperv_net.h"
 
@@ -66,7 +68,8 @@ static void netvsc_set_multicast_list(struct net_device *net)
 
 static int netvsc_open(struct net_device *net)
 {
-	struct netvsc_device *nvdev = net_device_to_netvsc_device(net);
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct netvsc_device *nvdev = ndev_ctx->nvdev;
 	struct rndis_device *rdev;
 	int ret = 0;
 
@@ -82,7 +85,7 @@ static int netvsc_open(struct net_device *net)
 	netif_tx_wake_all_queues(net);
 
 	rdev = nvdev->extension;
-	if (!rdev->link_state)
+	if (!rdev->link_state && !ndev_ctx->datapath)
 		netif_carrier_on(net);
 
 	return ret;
@@ -93,7 +96,7 @@ static int netvsc_close(struct net_device *net)
 	struct net_device_context *net_device_ctx = netdev_priv(net);
 	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 	int ret;
-	u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
+	u32 aread, i, msec = 10, retry = 0, retry_max = 20;
 	struct vmbus_channel *chn;
 
 	netif_tx_disable(net);
@@ -112,15 +115,11 @@ static int netvsc_close(struct net_device *net)
 			if (!chn)
 				continue;
 
-			hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
-						     &awrite);
-
+			aread = hv_get_bytes_to_read(&chn->inbound);
 			if (aread)
 				break;
 
-			hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
-						     &awrite);
-
+			aread = hv_get_bytes_to_read(&chn->outbound);
 			if (aread)
 				break;
 		}
@@ -316,34 +315,14 @@ static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 	return slots_used;
 }
 
-static int count_skb_frag_slots(struct sk_buff *skb)
-{
-	int i, frags = skb_shinfo(skb)->nr_frags;
-	int pages = 0;
-
-	for (i = 0; i < frags; i++) {
-		skb_frag_t *frag = skb_shinfo(skb)->frags + i;
-		unsigned long size = skb_frag_size(frag);
-		unsigned long offset = frag->page_offset;
-
-		/* Skip unused frames from start of page */
-		offset &= ~PAGE_MASK;
-		pages += PFN_UP(offset + size);
-	}
-	return pages;
-}
-
-static int netvsc_get_slots(struct sk_buff *skb)
+/* Estimate number of page buffers neede to transmit
+ * Need at most 2 for RNDIS header plus skb body and fragments.
+ */
+static unsigned int netvsc_get_slots(const struct sk_buff *skb)
 {
-	char *data = skb->data;
-	unsigned int offset = offset_in_page(data);
-	unsigned int len = skb_headlen(skb);
-	int slots;
-	int frag_slots;
-
-	slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
-	frag_slots = count_skb_frag_slots(skb);
-	return slots + frag_slots;
+	return PFN_UP(offset_in_page(skb->data) + skb_headlen(skb))
+		+ skb_shinfo(skb)->nr_frags
+		+ 2;
 }
 
 static u32 net_checksum_info(struct sk_buff *skb)
@@ -381,21 +360,18 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 	struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
 	struct hv_page_buffer *pb = page_buf;
 
-	/* We will atmost need two pages to describe the rndis
-	 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
+	/* We can only transmit MAX_PAGE_BUFFER_COUNT number
 	 * of pages in a single packet. If skb is scattered around
 	 * more pages we try linearizing it.
 	 */
-
-	num_data_pgs = netvsc_get_slots(skb) + 2;
-
+	num_data_pgs = netvsc_get_slots(skb);
 	if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 		++net_device_ctx->eth_stats.tx_scattered;
 
 		if (skb_linearize(skb))
 			goto no_memory;
 
-		num_data_pgs = netvsc_get_slots(skb) + 2;
+		num_data_pgs = netvsc_get_slots(skb);
 		if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 			++net_device_ctx->eth_stats.tx_too_big;
 			goto drop;
@@ -618,7 +594,7 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 	 * Copy to skb. This copy is needed here since the memory pointed by
 	 * hv_netvsc_packet cannot be deallocated
 	 */
-	memcpy(skb_put(skb, buflen), data, buflen);
+	skb_put_data(skb, data, buflen);
 
 	skb->protocol = eth_type_trans(skb, net);
 
@@ -1309,7 +1285,8 @@ static void netvsc_link_change(struct work_struct *w)
 	case RNDIS_STATUS_MEDIA_CONNECT:
 		if (rdev->link_state) {
 			rdev->link_state = false;
-			netif_carrier_on(net);
+			if (!ndev_ctx->datapath)
+				netif_carrier_on(net);
 			netif_tx_wake_all_queues(net);
 		} else {
 			notify = true;