Re: [Xen-devel] [PATCH 2/6] xen-netfront: reduce gso_max_size to account for ethernet header

[Malcolm Crossley <malcolm.crossley@xxxxxxxxxx>]

On 25/03/13 11:08, Wei Liu wrote:
> The maximum packet including ethernet header that can be handled by netfront /
> netback wire format is 65535. Reduce gso_max_size accordingly.
>
> Drop skb and print warning when skb->len > 65535. This can 1) save the effort
> to send malformed packet to netback, 2) help spotting misconfiguration of
> netfront in the future.
>
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
>
> index 5527663..3ae9dc1 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -1362,6 +1374,8 @@ static struct net_device *xennet_create_dev(struct 
> xenbus_device *dev)
>         SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops);
>         SET_NETDEV_DEV(netdev, &dev->dev);
>   
> +	netif_set_gso_max_size(netdev, 65535 - ETH_HLEN);
Is it worth ETH_HLEN actually being VLAN_ETH_HLEN so that we can support 
VLAN's and GSO?
> +
>         np->netdev = netdev;
>   
>   	netif_carrier_off(netdev);

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