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| author | David Vrabel <david.vrabel@citrix.com> | 2015-01-13 20:16:43 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-01-14 08:22:00 +0300 |
| commit | e84448d52190413400663736067f826f28a04ad6 (patch) | |
| tree | 0302a5f4f7399eae1fdd8ebd8475947af51fa3c4 /drivers/net/xen-netfront.c | |
| parent | 28e98c2c20e9d791cf58a624a5a2b1fca63ea47b (diff) | |
| download | linux-e84448d52190413400663736067f826f28a04ad6.tar.xz | |
xen-netfront: refactor skb slot counting
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>
Diffstat (limited to 'drivers/net/xen-netfront.c')
| -rw-r--r-- | drivers/net/xen-netfront.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index a4e50482a230..803ff5356faa 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -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); |