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/via/via-velocity.c b/drivers/net/ethernet/via/via-velocity.c
index b47bce1a2e2a..4535d7cc848e 100644
--- a/drivers/net/ethernet/via/via-velocity.c
+++ b/drivers/net/ethernet/via/via-velocity.c
@@ -2554,16 +2554,16 @@ static netdev_tx_t velocity_xmit(struct sk_buff *skb,
 
         /* Handle fragments */
         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];
 
                 tdinfo->skb_dma[i + 1] = skb_frag_dma_map(&vptr->pdev->dev,
                                                           frag, 0,
-                                                          frag->size,
+                                                          skb_frag_size(frag),
                                                           DMA_TO_DEVICE);
 
                 td_ptr->td_buf[i + 1].pa_low = cpu_to_le32(tdinfo->skb_dma[i + 1]);
                 td_ptr->td_buf[i + 1].pa_high = 0;
-                td_ptr->td_buf[i + 1].size = cpu_to_le16(frag->size);
+                td_ptr->td_buf[i + 1].size = cpu_to_le16(skb_frag_size(frag));
         }
         tdinfo->nskb_dma = i + 1;