From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dimitris Michailidis Subject: Re: [PATCH V3 5/8] Enable cxgb3 to support zerocopy Date: Wed, 20 Apr 2011 13:52:45 -0700 Message-ID: <4DAF479D.7090309@chelsio.com> References: <1303328216.19336.18.camel@localhost.localdomain> <1303330438.19336.57.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: David Miller , mst@redhat.com, Eric Dumazet , Avi Kivity , Arnd Bergmann , netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org To: Shirley Ma Return-path: In-Reply-To: <1303330438.19336.57.camel@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On 04/20/2011 01:13 PM, Shirley Ma wrote: > Signed-off-by: Shirley Ma > --- > > 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?