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

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Date:	Tue, 05 Apr 2011 19:20:40 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
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, 2011-04-05 at 20:15 +0200, Michał Mirosław wrote:
> 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?

No.

> 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).

So RX checksum offload is reported as enabled on the VLAN device iff it
is enabled for the physical device, which is correct.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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