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SubjectRe: [net-next PATCH 2/2] tuntap: initialize vlan_features
On Thu, Apr 11, 2013 at 05:32:22PM +0800, Jason Wang wrote:
> The vlan_features was zero which prevents vlan GSO packets to be transmitted to
> userspace. This is suboptimal so enable this by initialize vlan_features for
> tuntap.
>
> Netperf shows better performance of guest receiving since vlan TSO works for
> tuntap:
>
> before:
> netperf -H 192.168.5.4
> MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.5.4 ()
> port 0 AF_INET : demo
> Recv Send Send
> Socket Socket Message Elapsed
> Size Size Size Time Throughput
> bytes bytes bytes secs. 10^6bits/sec
>
> 87380 16384 16384 10.01 2786.67
>
> after:
> netperf -H 192.168.5.4
> MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.5.4 ()
> port 0 AF_INET : demo
> Recv Send Send
> Socket Socket Message Elapsed
> Size Size Size Time Throughput
> bytes bytes bytes secs. 10^6bits/sec
>
> 87380 16384 16384 10.00 8085.49
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
> drivers/net/tun.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 29538e6..316c759 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -1656,6 +1656,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
> dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
> TUN_USER_FEATURES;
> dev->features = dev->hw_features;
> + dev->vlan_features = dev->features;
>
> INIT_LIST_HEAD(&tun->disabled);
> err = tun_attach(tun, file);
> --
> 1.7.1


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