net: add skb frag size accessors

To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.

Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 8d70b44fcd8a..d5508957200e 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -334,7 +334,7 @@ unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb)
                 count++;
 
         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-                unsigned long size = skb_shinfo(skb)->frags[i].size;
+                unsigned long size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
                 unsigned long bytes;
                 while (size > 0) {
                         BUG_ON(copy_off > MAX_BUFFER_OFFSET);
@@ -526,7 +526,7 @@ static int netbk_gop_skb(struct sk_buff *skb,
         for (i = 0; i < nr_frags; i++) {
                 netbk_gop_frag_copy(vif, skb, npo,
                                     skb_frag_page(&skb_shinfo(skb)->frags[i]),
-                                    skb_shinfo(skb)->frags[i].size,
+                                    skb_frag_size(&skb_shinfo(skb)->frags[i]),
                                     skb_shinfo(skb)->frags[i].page_offset,
                                     &head);
         }