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xen-netfront: refactor skb slot counting

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A function to count the number of slots an skb needs is more useful
than one that counts the slots needed for only the frags.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Vrabel 2015-01-13 17:16:43 +00:00 committed by David S. Miller
parent 28e98c2c20
commit e84448d521
1 changed files with 7 additions and 6 deletions
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13
drivers/net/xen-netfront.c
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@ -517,13 +517,15 @@ static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue *queue,
}
/*
* Count how many ring slots are required to send the frags of this
* skb. Each frag might be a compound page.
* Count how many ring slots are required to send this skb. Each frag
* might be a compound page.
*/
static int xennet_count_skb_frag_slots(struct sk_buff *skb)
static int xennet_count_skb_slots(struct sk_buff *skb)
{
int i, frags = skb_shinfo(skb)->nr_frags;
int pages = 0;
int pages;
pages = PFN_UP(offset_in_page(skb->data) + skb_headlen(skb));
for (i = 0; i < frags; i++) {
skb_frag_t *frag = skb_shinfo(skb)->frags + i;
@ -593,8 +595,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
goto drop;
}
slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) +
xennet_count_skb_frag_slots(skb);
slots = xennet_count_skb_slots(skb);
if (unlikely(slots > MAX_SKB_FRAGS + 1)) {
net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n",
slots, skb->len);