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Date: Thu, 12 Dec 2013 15:48:15 -0500 (EST)
From: David Miller <davem@...emloft.net>
To: Ian.Campbell@...rix.com
Cc: paul.durrant@...rix.com, xen-devel@...ts.xen.org,
netdev@...r.kernel.org, wei.liu2@...rix.com,
david.vrabel@...rix.com
Subject: Re: [PATCH net] xen-netback: fix gso_prefix check
From: Ian Campbell <Ian.Campbell@...rix.com>
Date: Thu, 12 Dec 2013 14:42:22 +0000
> On Thu, 2013-12-12 at 14:20 +0000, Paul Durrant wrote:
>> 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@...rix.com>
>> Cc: Wei Liu <wei.liu2@...rix.com>
>> Cc: Ian Campbell <ian.campbell@...rix.com>
>> Cc: David Vrabel <david.vrabel@...rix.com>
>> ---
>> drivers/net/xen-netback/netback.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
>> index 56c3e5a..999e290 100644
>> --- a/drivers/net/xen-netback/netback.c
>> +++ b/drivers/net/xen-netback/netback.c
>> @@ -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) {
>
> gso_type here is XEN_NETIF_GSO_TYPE_TCPV4, vif->gso_prefix_mask is
> initialised with GSO_BIT(TCPV4) et al. Where
> #define GSO_BIT(type) \
> (1 << XEN_NETIF_GSO_TYPE_ ## type)
>
> So,
> Acked-by: Ian Campbell <ian.campbell@...rix.com>
Applied and queued up for -stable, thanks.
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