Re: [Xen-devel] [PATCH] netback: disable features not supported by netfront

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.10.11 at 09:41, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
> From: pbonzini@xxxxxxxxxx 
> 
> # HG changeset patch
> # User Paolo Bonzini <pbonzini@xxxxxxxxxx>
> # Date 1318837036 -7200
> # Node ID eb896361fc70b60b9a257d0c82e19633a11b9d41
> # Parent  3c900d6a5f6a51ff1547f21fef30ab8b92feccc9
> netback: disable features not supported by netfront
> 
> Netback works by first setting all possible features, and then
> resetting some after connection, if the front-end didn't negotiate them.
> Except that in the old 2.6.18 tree the "resetting" part was missing.

Indeed - I always wondered about that. Applied, thanks!

Jan

> In the pvops tree, this should work correctly through the fix_features
> mechanism.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> 
> diff --git a/drivers/xen/netback/interface.c b/drivers/xen/netback/interface.c
> --- a/drivers/xen/netback/interface.c
> +++ b/drivers/xen/netback/interface.c
> @@ -98,8 +98,9 @@ static int netbk_change_mtu(struct net_d
>  void netif_set_features(netif_t *netif)
>  {
>       struct net_device *dev = netif->dev;
> -     int features = dev->features;
> +     int features;
>  
> +     features = dev->features & ~(NETIF_F_SG|NETIF_F_TSO|NETIF_F_IP_CSUM);
>       if (netif->can_sg)
>               features |= NETIF_F_SG;
>       if (netif->gso)
> 
> 
> 
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