On 01/24/2017 12:28 AM, Thomas Huth wrote:
> When using the ibmveth driver in a KVM/QEMU based VM, it currently
> always prints out a scary error message like this when it is started:
>
> ibmveth 71000003 (unregistered net_device): unable to change
> checksum offload settings. 1 rc=-2 ret_attr=71000003
>
> This happens because the driver always tries to enable the checksum
> offloading without checking for the availability of this feature first.
> QEMU does not support checksum offloading for the spapr-vlan device,
> thus we always get the error message here.
> According to the LoPAPR specification, the "ibm,illan-options" property
> of the corresponding device tree node should be checked first to see
> whether the H_ILLAN_ATTRIUBTES hypercall and thus the checksum offloading
> feature is available. Thus let's do this in the ibmveth driver, too, so
> that the error message is really only limited to cases where something
> goes wrong, and does not occur if the feature is just missing.
Thanks a lot for this patch, Thomas. Was going to give an Ack, but its already
been applied :)
>
> Signed-off-by: Thomas Huth <th...@redhat.com>
> ---
> drivers/net/ethernet/ibm/ibmveth.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/ibm/ibmveth.c
> b/drivers/net/ethernet/ibm/ibmveth.c
> index a831f94..309f5c6 100644
> --- a/drivers/net/ethernet/ibm/ibmveth.c
> +++ b/drivers/net/ethernet/ibm/ibmveth.c
> @@ -1601,8 +1601,11 @@ static int ibmveth_probe(struct vio_dev *dev, const
> struct vio_device_id *id)
> netdev->netdev_ops = &ibmveth_netdev_ops;
> netdev->ethtool_ops = &netdev_ethtool_ops;
> SET_NETDEV_DEV(netdev, &dev->dev);
> - netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
> - NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
> + netdev->hw_features = NETIF_F_SG;
> + if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
> + netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
> + NETIF_F_RXCSUM;
> + }
>
> netdev->features |= netdev->hw_features;
>
