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>
diff --git a/drivers/net/ethernet/chelsio/cxgb/sge.c b/drivers/net/ethernet/chelsio/cxgb/sge.c
index 0a511c4a..f9b6023 100644
--- a/drivers/net/ethernet/chelsio/cxgb/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb/sge.c
@@ -1135,8 +1135,8 @@
len -= SGE_TX_DESC_MAX_PLEN;
}
for (i = 0; nfrags--; i++) {
- skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- len = frag->size;
+ const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ len = skb_frag_size(frag);
while (len > SGE_TX_DESC_MAX_PLEN) {
count++;
len -= SGE_TX_DESC_MAX_PLEN;
@@ -1278,9 +1278,9 @@
}
mapping = skb_frag_dma_map(&adapter->pdev->dev, frag, 0,
- frag->size, DMA_TO_DEVICE);
+ skb_frag_size(frag), DMA_TO_DEVICE);
desc_mapping = mapping;
- desc_len = frag->size;
+ desc_len = skb_frag_size(frag);
pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen,
&desc_mapping, &desc_len,
@@ -1290,7 +1290,7 @@
nfrags == 0);
ce->skb = NULL;
dma_unmap_addr_set(ce, dma_addr, mapping);
- dma_unmap_len_set(ce, dma_len, frag->size);
+ dma_unmap_len_set(ce, dma_len, skb_frag_size(frag));
}
ce->skb = skb;
wmb();