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[Xen-changelog] Fix the request size for a full page-sized skbuff in net

from [Xen patchbot -unstable]

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Subject:	[Xen-changelog] Fix the request size for a full page-sized skbuff in netfront
From:	Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date:	Tue, 06 Dec 2005 17:52:28 +0000
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# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID c976c1ff806aa46c989fb5b1d84b311519fb0456
# Parent  4e9c643968ffd0526258dc1ae7d1fee6123be718
Fix the request size for a full page-sized skbuff in netfront
driver (must allow 16 bytes for dev_alloc_skb headroom).

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 4e9c643968ff -r c976c1ff806a 
linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c      Tue Dec  6 
14:02:54 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c      Tue Dec  6 
14:52:15 2005
@@ -535,8 +535,12 @@
         */
        batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
        for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
+               /*
+                * Subtract dev_alloc_skb headroom (16 bytes) and shared info
+                * tailroom then round down to SKB_DATA_ALIGN boundary.
+                */
                skb = alloc_xen_skb(
-                       (PAGE_SIZE - sizeof(struct skb_shared_info)) &
+                       (PAGE_SIZE - 16 - sizeof(struct skb_shared_info)) &
                        (-SKB_DATA_ALIGN(1)));
                if (skb == NULL)
                        break;

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