vlan: Add ethtool support

Add ethtool support for querying the device for offload settings.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 88f318a9601d..722697d31e4f 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -28,6 +28,7 @@
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
+#include <linux/ethtool.h>
 #include <net/datalink.h>
 #include <net/p8022.h>
 #include <net/arp.h>
@@ -716,6 +717,22 @@ static void vlan_dev_uninit(struct net_device *dev)
         }
 }
 
+static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
+{
+        const struct vlan_dev_info *vlan = vlan_dev_info(dev);
+        struct net_device *real_dev = vlan->real_dev;
+
+        if (real_dev->ethtool_ops == NULL ||
+            real_dev->ethtool_ops->get_rx_csum == NULL)
+                return 0;
+        return real_dev->ethtool_ops->get_rx_csum(real_dev);
+}
+
+static const struct ethtool_ops vlan_ethtool_ops = {
+        .get_link               = ethtool_op_get_link,
+        .get_rx_csum            = vlan_ethtool_get_rx_csum,
+};
+
 void vlan_setup(struct net_device *dev)
 {
         ether_setup(dev);
@@ -734,6 +751,7 @@ void vlan_setup(struct net_device *dev)
         dev->change_rx_flags    = vlan_dev_change_rx_flags;
         dev->do_ioctl           = vlan_dev_ioctl;
         dev->destructor         = free_netdev;
+        dev->ethtool_ops        = &vlan_ethtool_ops;
 
         memset(dev->broadcast, 0, ETH_ALEN);
 }