* [PATCH 3 of 5] xen-netfront: Avoid unaligned accesses to IP header
[not found] <patchbomb.1224031839@abulafia.goop.org>
@ 2008-10-15 0:50 ` Jeremy Fitzhardinge
2008-10-16 9:12 ` Jeff Garzik
0 siblings, 1 reply; 2+ messages in thread
From: Jeremy Fitzhardinge @ 2008-10-15 0:50 UTC (permalink / raw)
To: Jeff Garzik; +Cc: linux-kernel, Isaku Yamahata, NetDev, Ingo Molnar
From: Isaku Yamahata <yamahata@valinux•co.jp>
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.
[ Jeff, this is the only patch in the series which is in your
territory. -J ]
Signed-off-by: Isaku Yamahata <yamahata@valinux•co.jp>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix•com>
---
drivers/net/xen-netfront.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -239,10 +239,13 @@
*/
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) {
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