netdev - Re: [PATCHv2 net-next-2.6 3/7] sfc: Implement generic features interface

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Date:	Tue, 5 Apr 2011 20:15:52 +0200
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com
Subject: Re: [PATCHv2 net-next-2.6 3/7] sfc: Implement generic features
	interface

On Tue, Apr 05, 2011 at 07:03:29PM +0100, Ben Hutchings wrote:
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> ---
>  drivers/net/sfc/efx.c        |   20 +++++++++--
>  drivers/net/sfc/ethtool.c    |   78 ------------------------------------------
>  drivers/net/sfc/net_driver.h |    2 -
>  drivers/net/sfc/rx.c         |    2 +-
>  4 files changed, 18 insertions(+), 84 deletions(-)
> 
> diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
> index 542f32d..db72a6e 100644
> --- a/drivers/net/sfc/efx.c
> +++ b/drivers/net/sfc/efx.c
[...]
> @@ -2452,12 +2463,15 @@ static int __devinit efx_pci_probe(struct pci_dev *pci_dev,
>  		return -ENOMEM;
>  	net_dev->features |= (type->offload_features | NETIF_F_SG |
>  			      NETIF_F_HIGHDMA | NETIF_F_TSO |
> -			      NETIF_F_GRO);
> +			      NETIF_F_RXCSUM);
>  	if (type->offload_features & NETIF_F_V6_CSUM)
>  		net_dev->features |= NETIF_F_TSO6;
>  	/* Mask for features that also apply to VLAN devices */
>  	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
> -				   NETIF_F_HIGHDMA | NETIF_F_ALL_TSO);
> +				   NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
> +				   NETIF_F_RXCSUM);
> +	/* All offloads can be toggled */
> +	net_dev->hw_features = net_dev->features & ~NETIF_F_HIGHDMA;
>  	efx = netdev_priv(net_dev);
>  	pci_set_drvdata(pci_dev, efx);
>  	SET_NETDEV_DEV(net_dev, &pci_dev->dev);

Does the driver really allow independent switching of RX checksumming
for tagged and untagged frames? The VLAN code currently doesn't ignore
HW checksum when present in skb and doesn't allow toggling of the feature
(see: vlan_fix_features() and vlan_skb_recv() in net/8021q/vlan_dev.c).

Best Regards,
Michał Mirosław
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