On Tue, 27 Apr 2010 15:20:25 -0700
Dimitris Michailidis <dm@chelsio.com> wrote:

quoted text
> Implement the ->set_flags ethtool method to control NETIF_F_RXHASH and
> set skb->rxhash to the HW calculated hash accordingly.
> 
> Signed-off-by: Dimitris Michailidis <dm@chelsio.com>
> ---
>  drivers/net/cxgb4/cxgb4_main.c |   15 ++++++++++++++-
>  drivers/net/cxgb4/sge.c        |    7 ++++++-
>  drivers/net/cxgb4/t4_msg.h     |    1 +
>  3 files changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/cxgb4/cxgb4_main.c b/drivers/net/cxgb4/cxgb4_main.c
> index 5f582db..1bad500 100644
> --- a/drivers/net/cxgb4/cxgb4_main.c
> +++ b/drivers/net/cxgb4/cxgb4_main.c
> @@ -1711,6 +1711,18 @@ static int set_tso(struct net_device *dev, u32 value)
>  	return 0;
>  }
>  
> +static int set_flags(struct net_device *dev, u32 flags)
> +{
> +	if (flags & ~ETH_FLAG_RXHASH)
> +		return -EOPNOTSUPP;
> +
> +	if (flags & ETH_FLAG_RXHASH)
> +		dev->features |= NETIF_F_RXHASH;
> +	else
> +		dev->features &= ~NETIF_F_RXHASH;
> +	return 0;
> +}

You need to check for and reject other values NTUPLE and LRO
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