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>

2 files changed, 4 insertions, 4 deletions

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index 5dcd5be03f3..ee5da9293ce 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -777,12 +777,12 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
                 entry = NEXT_TX(entry);
 
                 for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
-                        skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
+                        const skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
                         u32 len;
                         u32 ctrl;
                         dma_addr_t mapping;
 
-                        len = this_frag->size;
+                        len = skb_frag_size(this_frag);
                         mapping = dma_map_single(&cp->pdev->dev,
                                                  skb_frag_address(this_frag),
                                                  len, PCI_DMA_TODEVICE);
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 2ce60709a45..aa39e771175 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5413,7 +5413,7 @@ static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
 
         entry = tp->cur_tx;
         for (cur_frag = 0; cur_frag < info->nr_frags; cur_frag++) {
-                skb_frag_t *frag = info->frags + cur_frag;
+                const skb_frag_t *frag = info->frags + cur_frag;
                 dma_addr_t mapping;
                 u32 status, len;
                 void *addr;
@@ -5421,7 +5421,7 @@ static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
                 entry = (entry + 1) % NUM_TX_DESC;
 
                 txd = tp->TxDescArray + entry;
-                len = frag->size;
+                len = skb_frag_size(frag);
                 addr = skb_frag_address(frag);
                 mapping = dma_map_single(d, addr, len, DMA_TO_DEVICE);
                 if (unlikely(dma_mapping_error(d, mapping))) {