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, 4 insertions, 4 deletions

diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c
index 6715bf54f04e..442fefa4f2ca 100644
--- a/drivers/net/ethernet/aeroflex/greth.c
+++ b/drivers/net/ethernet/aeroflex/greth.c
@@ -198,7 +198,7 @@ static void greth_clean_rings(struct greth_private *greth)
 
                                 dma_unmap_page(greth->dev,
                                                greth_read_bd(&tx_bdp->addr),
-                                               frag->size,
+                                               skb_frag_size(frag),
                                                DMA_TO_DEVICE);
 
                                 greth->tx_last = NEXT_TX(greth->tx_last);
@@ -517,7 +517,7 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
                 status = GRETH_BD_EN;
                 if (skb->ip_summed == CHECKSUM_PARTIAL)
                         status |= GRETH_TXBD_CSALL;
-                status |= frag->size & GRETH_BD_LEN;
+                status |= skb_frag_size(frag) & GRETH_BD_LEN;
 
                 /* Wrap around descriptor ring */
                 if (curr_tx == GRETH_TXBD_NUM_MASK)
@@ -531,7 +531,7 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 
                 greth_write_bd(&bdp->stat, status);
 
-                dma_addr = skb_frag_dma_map(greth->dev, frag, 0, frag->size,
+                dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
                                             DMA_TO_DEVICE);
 
                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
@@ -713,7 +713,7 @@ static void greth_clean_tx_gbit(struct net_device *dev)
 
                         dma_unmap_page(greth->dev,
                                        greth_read_bd(&bdp->addr),
-                                       frag->size,
+                                       skb_frag_size(frag),
                                        DMA_TO_DEVICE);
 
                         greth->tx_last = NEXT_TX(greth->tx_last);