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/xen-netfront.c b/drivers/net/xen-netfront.c
index 6e5d4c0..226faab 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -467,7 +467,7 @@
tx->gref = np->grant_tx_ref[id] = ref;
tx->offset = frag->page_offset;
- tx->size = frag->size;
+ tx->size = skb_frag_size(frag);
tx->flags = 0;
}
@@ -965,7 +965,7 @@
if (rx->status > len) {
skb_shinfo(skb)->frags[0].page_offset =
rx->offset + len;
- skb_shinfo(skb)->frags[0].size = rx->status - len;
+ skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status - len);
skb->data_len = rx->status - len;
} else {
__skb_fill_page_desc(skb, 0, NULL, 0, 0);