vlan: allow TSO setting on vlan interfaces
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>
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 7865a4c..a1b8171 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -836,12 +836,32 @@
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 = {