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authorIsaku Yamahata <yamahata@valinux.co.jp>2008-10-14 17:50:42 -0700
committerJeff Garzik <jgarzik@redhat.com>2008-10-16 05:11:07 -0400
commit617a20bbd099040b68f3578a0a1da5e8780d1831 (patch)
tree28be551ea379012afea820e809591883c47f992e
parent8ab7b66796920e785d27c88fcde1539fa661ae14 (diff)
xen-netfront: Avoid unaligned accesses to IP header
Align ip header to a 16 byte boundary to avoid unaligned access like other drivers. Without this patch, xen-netfront doesn't work well on ia64. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/net/xen-netfront.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index c749bdba214..9ffe743f4eb 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -239,11 +239,14 @@ static void xennet_alloc_rx_buffers(struct net_device *dev)
*/
batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
- skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD,
+ skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN,
GFP_ATOMIC | __GFP_NOWARN);
if (unlikely(!skb))
goto no_skb;
+ /* Align ip header to a 16 bytes boundary */
+ skb_reserve(skb, NET_IP_ALIGN);
+
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
if (!page) {
kfree_skb(skb);