netdev - RE: [RFC, VLAN]: Propagate selected feature bits to VLAN devices

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Date:	Tue, 20 May 2008 12:58:28 -0700
From:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
To:	"Patrick McHardy" <kaber@...sh.net>,
	"Ben Hutchings" <bhutchings@...arflare.com>
Cc:	"Linux Netdev List" <netdev@...r.kernel.org>
Subject: RE: [RFC, VLAN]: Propagate selected feature bits to VLAN devices

> > Shouldn't this mask the flags out of vlandev->features first?
> >   
> Yes, thanks.
> >> +	dev->features = real_dev->features & (NETIF_F_TSO | 
> NETIF_F_TSO6);
> >>     
> > This should also test the NETIF_F_VLAN_TSO flag and should copy the 
> > NETIF_F_ALL_CSUM and NETIF_F_SG flags since TSO requires those (see
> > register_netdevice() feature fix-up).  Peter pointed out that TX 
> > checksum offload for VLANs might be available even without TSO; the 
> > same goes for scatter-gather but I don't know whether it's 
> worth adding a flag for that.
> >   
> 
> Thanks, I added NETIF_F_SG to the VLAN TSO flags and added a 
> NETIF_F_VLAN_CSUM flag for TX checksums. I didn't change 
> GSO_SHIFT so far.

I've tested your latest patch with an in-house modified ixgbe driver,
both with CSUM and TSO.  This patch works great for adding and removing
the feature flags on demand.  Thanks for putting this together Patrick.

-PJ Waskiewicz
<peter.p.waskiewicz.jr@...el.com>
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