Merge tag 'vfio-for-linus' of git://github.com/awilliam/linux-vfio

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / net / xen-netfront.c

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 3089990..650f79a 100644 (file)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -57,8 +57,7 @@
 static const struct ethtool_ops xennet_ethtool_ops;
 
 struct netfront_cb {
-       struct page *page;
-       unsigned offset;
+       int pull_to;
 };
 
 #define NETFRONT_SKB_CB(skb)   ((struct netfront_cb *)((skb)->cb))
@@ -867,15 +866,9 @@ static int handle_incoming_queue(struct net_device *dev,
        struct sk_buff *skb;
 
        while ((skb = __skb_dequeue(rxq)) != NULL) {
-               struct page *page = NETFRONT_SKB_CB(skb)->page;
-               void *vaddr = page_address(page);
-               unsigned offset = NETFRONT_SKB_CB(skb)->offset;
-
-               memcpy(skb->data, vaddr + offset,
-                      skb_headlen(skb));
+               int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
 
-               if (page != skb_frag_page(&skb_shinfo(skb)->frags[0]))
-                       __free_page(page);
+               __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
 
                /* Ethernet work: Delayed to here as it peeks the header. */
                skb->protocol = eth_type_trans(skb, dev);
@@ -913,7 +906,6 @@ static int xennet_poll(struct napi_struct *napi, int budget)
        struct sk_buff_head errq;
        struct sk_buff_head tmpq;
        unsigned long flags;
-       unsigned int len;
        int err;
 
        spin_lock(&np->rx_lock);
@@ -955,24 +947,13 @@ err:
                        }
                }
 
-               NETFRONT_SKB_CB(skb)->page =
-                       skb_frag_page(&skb_shinfo(skb)->frags[0]);
-               NETFRONT_SKB_CB(skb)->offset = rx->offset;
-
-               len = rx->status;
-               if (len > RX_COPY_THRESHOLD)
-                       len = RX_COPY_THRESHOLD;
-               skb_put(skb, len);
+               NETFRONT_SKB_CB(skb)->pull_to = rx->status;
+               if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
+                       NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
 
-               if (rx->status > len) {
-                       skb_shinfo(skb)->frags[0].page_offset =
-                               rx->offset + len;
-                       skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status - len);
-                       skb->data_len = rx->status - len;
-               } else {
-                       __skb_fill_page_desc(skb, 0, NULL, 0, 0);
-                       skb_shinfo(skb)->nr_frags = 0;
-               }
+               skb_shinfo(skb)->frags[0].page_offset = rx->offset;
+               skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
+               skb->data_len = rx->status;
 
                i = xennet_fill_frags(np, skb, &tmpq);
 
@@ -999,7 +980,7 @@ err:
                 * receive throughout using the standard receive
                 * buffer size was cut by 25%(!!!).
                 */
-               skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len);
+               skb->truesize += skb->data_len - RX_COPY_THRESHOLD;
                skb->len += skb->data_len;
 
                if (rx->flags & XEN_NETRXF_csum_blank)