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, 3 insertions, 3 deletions

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 23740e848ac9..73c708107a37 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -3594,7 +3594,7 @@ static int release_tx_packet(struct niu *np, struct tx_ring_info *rp, int idx)
                 tb = &rp->tx_buffs[idx];
                 BUG_ON(tb->skb != NULL);
                 np->ops->unmap_page(np->device, tb->mapping,
-                                    skb_shinfo(skb)->frags[i].size,
+                                    skb_frag_size(&skb_shinfo(skb)->frags[i]),
                                     DMA_TO_DEVICE);
                 idx = NEXT_TX(rp, idx);
         }
@@ -6727,9 +6727,9 @@ static netdev_tx_t niu_start_xmit(struct sk_buff *skb,
         }
 
         for (i = 0; i <  skb_shinfo(skb)->nr_frags; i++) {
-                skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
-                len = frag->size;
+                len = skb_frag_size(frag);
                 mapping = np->ops->map_page(np->device, skb_frag_page(frag),
                                             frag->page_offset, len,
                                             DMA_TO_DEVICE);