netdev - Re: [PATCH V3 5/8] Enable cxgb3 to support zerocopy

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Message-ID: <4DAF479D.7090309@chelsio.com>
Date:	Wed, 20 Apr 2011 13:52:45 -0700
From:	Dimitris Michailidis <dm@...lsio.com>
To:	Shirley Ma <mashirle@...ibm.com>
CC:	David Miller <davem@...emloft.net>, mst@...hat.com,
	Eric Dumazet <eric.dumazet@...il.com>,
	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 5/8] Enable cxgb3 to support zerocopy

On 04/20/2011 01:13 PM, Shirley Ma wrote:
> Signed-off-by: Shirley Ma <xma@...ibm.com>
> ---
> 
>  drivers/net/cxgb3/cxgb3_main.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
> index 9108931..93a1101 100644
> --- a/drivers/net/cxgb3/cxgb3_main.c
> +++ b/drivers/net/cxgb3/cxgb3_main.c
> @@ -3313,7 +3313,7 @@ static int __devinit init_one(struct pci_dev *pdev,
>  		netdev->features |= NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
>  		netdev->features |= NETIF_F_GRO;
>  		if (pci_using_dac)
> -			netdev->features |= NETIF_F_HIGHDMA;
> +			netdev->features |= NETIF_F_HIGHDMA | NETIF_F_ZEROCOPY;
>  
>  		netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
>  		netdev->netdev_ops = &cxgb_netdev_ops;

The features handling has been reworked in net-next and patches like this 
won't apply as the code you're patching has changed.  Also core code now 
does a lot of the related work and you'll need to tell it what to do with 
any new flags.

What properties does a device or driver need to meet to set this flag?  It 
seems to be set a bit too unconditionally.  For example, does it work if one 
disables scatter/gather?
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