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xen-netback: fix gso_prefix check 

There is a mistake in checking the gso_prefix mask when passing large
packets to a guest. The wrong shift is applied to the bit - the raw skb
gso type is used rather then the translated one. This leads to large packets
being handed to the guest without the GSO metadata. This patch fixes the
check.

The mistake manifested as errors whilst running Microsoft HCK large packet
offload tests between a pair of Windows 8 VMs. I have verified this patch
fixes those errors.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Durrant 2013-12-12 14:20:13 +00:00 committed by David S. Miller
parent a0a9663dd2
commit a3314f3d40
1 changed files with 1 additions and 1 deletions
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2
drivers/net/xen-netback/netback.c
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@ -452,7 +452,7 @@ static int xenvif_gop_skb(struct sk_buff *skb,
}
/* Set up a GSO prefix descriptor, if necessary */
if ((1 << skb_shinfo(skb)->gso_type) & vif->gso_prefix_mask) {
if ((1 << gso_type) & vif->gso_prefix_mask) {
req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
meta = npo->meta + npo->meta_prod++;
meta->gso_type = gso_type;