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vlan: allow TSO setting on vlan interfaces

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When we need to shape traffic using low speeds, we need to
disable tso on network interface :

ethtool -K eth0.2240 tso off

It seems vlan interfaces miss the set_tso() ethtool method.

Before enabling TSO, we must check real device supports
TSO for VLAN-tagged packets and enables TSO.

Note that a TSO change on real device propagates TSO setting
on all vlans, even if admin selected a different TSO setting.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-07-08 23:12:21 -07:00 committed by David S. Miller
parent dd4ba83dc1
commit a204b48ed4
1 changed files with 20 additions and 0 deletions
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20
net/8021q/vlan_dev.c
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@ -836,12 +836,32 @@ static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, st
return stats;
}
static int vlan_ethtool_set_tso(struct net_device *dev, u32 data)
{
if (data) {
struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
/* Underlying device must support TSO for VLAN-tagged packets
* and must have TSO enabled now.
*/
if (!(real_dev->vlan_features & NETIF_F_TSO))
return -EOPNOTSUPP;
if (!(real_dev->features & NETIF_F_TSO))
return -EINVAL;
dev->features |= NETIF_F_TSO;
} else {
dev->features &= ~NETIF_F_TSO;
}
return 0;
}
static const struct ethtool_ops vlan_ethtool_ops = {
.get_settings = vlan_ethtool_get_settings,
.get_drvinfo = vlan_ethtool_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_rx_csum = vlan_ethtool_get_rx_csum,
.get_flags = vlan_ethtool_get_flags,
.set_tso = vlan_ethtool_set_tso,
};
static const struct net_device_ops vlan_netdev_ops = {