Commit b69bbddf authored Jul 18, 2013 by Flavio Leitner Committed by David S. Miller Jul 19, 2013

veth: add vlan features



The veth device doesn't provide the vlan features,
so TSO for example is disabled and that causes
performance issues when using tagged traffic.

The test topology looks like this:

    br0                     br1
  /   \                  /     \
vnet  veth0.10 ----- veth1.10   vnet
VM                               VM

The netperf results with current veth driver:
MIGRATED TCP STREAM TEST from 192.168.1.1 ()
port 0 AF_INET to 192.168.1.2 () port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    10.01    2210.22

Now after applying the proposed patch:
MIGRATED TCP STREAM TEST from 192.168.1.1 ()
port 0 AF_INET to 192.168.1.2 () port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    10.00    13067.47

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 2f0a9afa

drivers/net/veth.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -269,6 +269,7 @@ static void veth_setup(struct net_device *dev)
		dev->ethtool_ops = &veth_ethtool_ops;
		dev->features \|= NETIF_F_LLTX;
		dev->features \|= VETH_FEATURES;
		dev->vlan_features = dev->features;
		dev->destructor = veth_dev_free;

		dev->hw_features = VETH_FEATURES;

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