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/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
index 88558b1aac07..e21148f8b160 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_main.c
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
@@ -1383,10 +1383,10 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
         }
 
         for (f = 0; f < nr_frags; f++) {
-                struct skb_frag_struct *frag;
+                const struct skb_frag_struct *frag;
 
                 frag = &skb_shinfo(skb)->frags[f];
-                len = frag->size;
+                len = skb_frag_size(frag);
                 offset = 0;
 
                 while (len) {