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, 5 insertions, 5 deletions

diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
index 91a6b7123539..adbda182f159 100644
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -481,7 +481,7 @@ static void efx_rx_packet_gro(struct efx_channel *channel,
                 skb_frag_set_page(skb, 0, page);
                 skb_shinfo(skb)->frags[0].page_offset =
                         efx_rx_buf_offset(efx, rx_buf);
-                skb_shinfo(skb)->frags[0].size = rx_buf->len;
+                skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx_buf->len);
                 skb_shinfo(skb)->nr_frags = 1;
 
                 skb->len = rx_buf->len;
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 3964a62dde8b..df88c5430f95 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -238,7 +238,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
                 if (i >= skb_shinfo(skb)->nr_frags)
                         break;
                 fragment = &skb_shinfo(skb)->frags[i];
-                len = fragment->size;
+                len = skb_frag_size(fragment);
                 i++;
                 /* Map for DMA */
                 unmap_single = false;
@@ -926,11 +926,11 @@ static int tso_get_fragment(struct tso_state *st, struct efx_nic *efx,
                             skb_frag_t *frag)
 {
         st->unmap_addr = skb_frag_dma_map(&efx->pci_dev->dev, frag, 0,
-                                          frag->size, DMA_TO_DEVICE);
+                                          skb_frag_size(frag), DMA_TO_DEVICE);
         if (likely(!dma_mapping_error(&efx->pci_dev->dev, st->unmap_addr))) {
                 st->unmap_single = false;
-                st->unmap_len = frag->size;
-                st->in_len = frag->size;
+                st->unmap_len = skb_frag_size(frag);
+                st->in_len = skb_frag_size(frag);
                 st->dma_addr = st->unmap_addr;
                 return 0;
         }