summaryrefslogtreecommitdiffstats
path: root/drivers/net/tun.c
diff options
context:
space:
mode:
authorJason Wang <jasowang@redhat.com>2013-04-11 01:32:22 +0200
committerDavid S. Miller <davem@davemloft.net>2013-04-11 22:21:57 +0200
commitc0317998c340203204ee7622d75a59f41ac13bc6 (patch)
tree8129faf92a06ed79310c70dbe307c2501f18e980 /drivers/net/tun.c
parentvirtio-net: initialize vlan_features (diff)
downloadlinux-c0317998c340203204ee7622d75a59f41ac13bc6.tar.xz
linux-c0317998c340203204ee7622d75a59f41ac13bc6.zip
tuntap: initialize vlan_features
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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 29538e6e914d..316c759bd988 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);