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, 13 insertions, 13 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 37cc9e5c56be..46a0df9afc3c 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -135,7 +135,7 @@ static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 
 	/* Set size and memtype fields */
 	for (i = 0; i < priv->num_frags; i++) {
-		skb_frags[i].size = priv->frag_info[i].frag_size;
+		skb_frag_size_set(&skb_frags[i], priv->frag_info[i].frag_size);
 		rx_desc->data[i].byte_count =
 			cpu_to_be32(priv->frag_info[i].frag_size);
 		rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
@@ -194,7 +194,7 @@ static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 		dma = be64_to_cpu(rx_desc->data[nr].addr);
 
 		en_dbg(DRV, priv, "Unmapping buffer at dma:0x%llx\n", (u64) dma);
-		pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
+		pci_unmap_single(mdev->pdev, dma, skb_frag_size(&skb_frags[nr]),
 				 PCI_DMA_FROMDEVICE);
 		put_page(skb_frags[nr].page);
 	}
@@ -421,7 +421,7 @@ static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 
 		/* Save page reference in skb */
 		skb_frags_rx[nr].page = skb_frags[nr].page;
-		skb_frags_rx[nr].size = skb_frags[nr].size;
+		skb_frag_size_set(&skb_frags_rx[nr], skb_frag_size(&skb_frags[nr]));
 		skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 		dma = be64_to_cpu(rx_desc->data[nr].addr);
 
@@ -430,13 +430,13 @@ static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 			goto fail;
 
 		/* Unmap buffer */
-		pci_unmap_single(mdev->pdev, dma, skb_frags_rx[nr].size,
+		pci_unmap_single(mdev->pdev, dma, skb_frag_size(&skb_frags_rx[nr]),
 				 PCI_DMA_FROMDEVICE);
 	}
 	/* Adjust size of last fragment to match actual length */
 	if (nr > 0)
-		skb_frags_rx[nr - 1].size = length -
-			priv->frag_info[nr - 1].frag_prefix_size;
+		skb_frag_size_set(&skb_frags_rx[nr - 1],
+			length - priv->frag_info[nr - 1].frag_prefix_size);
 	return nr;
 
 fail:
@@ -506,7 +506,7 @@ static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 		skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 
 		/* Adjust size of first fragment */
-		skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
+		skb_frag_size_sub(&skb_shinfo(skb)->frags[0], HEADER_COPY_SIZE);
 		skb->data_len = length - HEADER_COPY_SIZE;
 	}
 	return skb;
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 6e03de034ac7..2a192c2f207d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -226,7 +226,7 @@ static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
 				frag = &skb_shinfo(skb)->frags[i];
 				pci_unmap_page(mdev->pdev,
 					(dma_addr_t) be64_to_cpu(data[i].addr),
-					frag->size, PCI_DMA_TODEVICE);
+					skb_frag_size(frag), PCI_DMA_TODEVICE);
 			}
 		}
 		/* Stamp the freed descriptor */
@@ -256,7 +256,7 @@ static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
 				frag = &skb_shinfo(skb)->frags[i];
 				pci_unmap_page(mdev->pdev,
 					(dma_addr_t) be64_to_cpu(data->addr),
-					 frag->size, PCI_DMA_TODEVICE);
+					 skb_frag_size(frag), PCI_DMA_TODEVICE);
 				++data;
 			}
 		}
@@ -550,7 +550,7 @@ static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *sk
 		skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
 		if (skb_shinfo(skb)->nr_frags)
 			memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr,
-			       skb_shinfo(skb)->frags[0].size);
+			       skb_frag_size(&skb_shinfo(skb)->frags[0]));
 
 	} else {
 		inl->byte_count = cpu_to_be32(1 << 31 | spc);
@@ -570,7 +570,7 @@ static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *sk
 					skb_headlen(skb) - spc);
 			if (skb_shinfo(skb)->nr_frags)
 				memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc,
-					fragptr, skb_shinfo(skb)->frags[0].size);
+					fragptr, skb_frag_size(&skb_shinfo(skb)->frags[0]));
 		}
 
 		wmb();
@@ -757,11 +757,11 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 		for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) {
 			frag = &skb_shinfo(skb)->frags[i];
 			dma = pci_map_page(mdev->dev->pdev, frag->page, frag->page_offset,
-					   frag->size, PCI_DMA_TODEVICE);
+					   skb_frag_size(frag), PCI_DMA_TODEVICE);
 			data->addr = cpu_to_be64(dma);
 			data->lkey = cpu_to_be32(mdev->mr.key);
 			wmb();
-			data->byte_count = cpu_to_be32(frag->size);
+			data->byte_count = cpu_to_be32(skb_frag_size(frag));
 			--data;
 		}