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/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c0ee6b6b019..87a6b2e59e0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1106,8 +1106,8 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         for (i = 0; i < nfrags; i++) {
-                skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-                int len = frag->size;
+                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+                int len = skb_frag_size(frag);
 
                 entry = (++priv->cur_tx) % txsize;
                 desc = priv->dma_tx + entry;