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>

diff --git a/jme.c b/jme.c
index 48a0a23f342f604a04ca2f9fcd8b05a216c1d633..7a0c746f2749be4b5ddadfa0b7b7a8e37fc445da 100644 (file)
--- a/jme.c
+++ b/jme.c
@@ -1920,7 +1920,7 @@ jme_map_tx_skb(struct jme_adapter *jme, struct sk_buff *skb, int idx)
        u8 hidma = jme->dev->features & NETIF_F_HIGHDMA;
        int i, nr_frags = skb_shinfo(skb)->nr_frags;
        int mask = jme->tx_ring_mask;
-       struct skb_frag_struct *frag;
+       const struct skb_frag_struct *frag;
        u32 len;
 
        for (i = 0 ; i < nr_frags ; ++i) {
@@ -1930,7 +1930,7 @@ jme_map_tx_skb(struct jme_adapter *jme, struct sk_buff *skb, int idx)
 
                jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi,
                                skb_frag_page(frag),
-                               frag->page_offset, frag->size, hidma);
+                               frag->page_offset, skb_frag_size(frag), hidma);
        }
 
        len = skb_is_nonlinear(skb) ? skb_headlen(skb) : skb->len;