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>

3 files changed, 9 insertions, 11 deletions

diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index 12a0b30319db..02c7ed8d9eca 100644
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -2179,7 +2179,7 @@ static void atl1c_tx_map(struct atl1c_adapter *adapter,
 		memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
 
 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
-		buffer_info->length = frag->size;
+		buffer_info->length = skb_frag_size(frag);
 		buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
 						    frag, 0,
 						    buffer_info->length,
diff --git a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
index 97c45a4b855a..95483bcac1d0 100644
--- a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
+++ b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
@@ -1593,7 +1593,7 @@ static u16 atl1e_cal_tdp_req(const struct sk_buff *skb)
 	u16 proto_hdr_len = 0;
 
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-		fg_size = skb_shinfo(skb)->frags[i].size;
+		fg_size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
 		tpd_req += ((fg_size + MAX_TX_BUF_LEN - 1) >> MAX_TX_BUF_SHIFT);
 	}
 
@@ -1744,12 +1744,12 @@ static void atl1e_tx_map(struct atl1e_adapter *adapter,
 	}
 
 	for (f = 0; f < nr_frags; f++) {
-		struct skb_frag_struct *frag;
+		const struct skb_frag_struct *frag;
 		u16 i;
 		u16 seg_num;
 
 		frag = &skb_shinfo(skb)->frags[f];
-		buf_len = frag->size;
+		buf_len = skb_frag_size(frag);
 
 		seg_num = (buf_len + MAX_TX_BUF_LEN - 1) / MAX_TX_BUF_LEN;
 		for (i = 0; i < seg_num; i++) {
diff --git a/drivers/net/ethernet/atheros/atlx/atl1.c b/drivers/net/ethernet/atheros/atlx/atl1.c
index 7381a49fefb4..0405261efb5c 100644
--- a/drivers/net/ethernet/atheros/atlx/atl1.c
+++ b/drivers/net/ethernet/atheros/atlx/atl1.c
@@ -2267,11 +2267,11 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
 	}
 
 	for (f = 0; f < nr_frags; f++) {
-		struct skb_frag_struct *frag;
+		const struct skb_frag_struct *frag;
 		u16 i, nseg;
 
 		frag = &skb_shinfo(skb)->frags[f];
-		buf_len = frag->size;
+		buf_len = skb_frag_size(frag);
 
 		nseg = (buf_len + ATL1_MAX_TX_BUF_LEN - 1) /
 			ATL1_MAX_TX_BUF_LEN;
@@ -2356,7 +2356,6 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
 	int count = 1;
 	int ret_val;
 	struct tx_packet_desc *ptpd;
-	u16 frag_size;
 	u16 vlan_tag;
 	unsigned int nr_frags = 0;
 	unsigned int mss = 0;
@@ -2372,10 +2371,9 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
 
 	nr_frags = skb_shinfo(skb)->nr_frags;
 	for (f = 0; f < nr_frags; f++) {
-		frag_size = skb_shinfo(skb)->frags[f].size;
-		if (frag_size)
-			count += (frag_size + ATL1_MAX_TX_BUF_LEN - 1) /
-				ATL1_MAX_TX_BUF_LEN;
+		unsigned int f_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
+		count += (f_size + ATL1_MAX_TX_BUF_LEN - 1) /
+			 ATL1_MAX_TX_BUF_LEN;
 	}
 
 	mss = skb_shinfo(skb)->gso_size;