net: Fix ETHTOOL_GFEATURES compatibility

Implement getting rx checksum state for not updated drivers.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 66cdc76770ce..69a3edc182f9 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -168,6 +168,18 @@ EXPORT_SYMBOL(ethtool_ntuple_flush);
 
 #define ETHTOOL_DEV_FEATURE_WORDS       1
 
+static void ethtool_get_features_compat(struct net_device *dev,
+        struct ethtool_get_features_block *features)
+{
+        if (!dev->ethtool_ops)
+                return;
+
+        /* getting RX checksum */
+        if (dev->ethtool_ops->get_rx_csum)
+                if (dev->ethtool_ops->get_rx_csum(dev))
+                        features[0].active |= NETIF_F_RXCSUM;
+}
+
 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 {
         struct ethtool_gfeatures cmd = {
@@ -185,6 +197,8 @@ static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
         u32 __user *sizeaddr;
         u32 copy_size;
 
+        ethtool_get_features_compat(dev, features);
+
         sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
         if (get_user(copy_size, sizeaddr))
                 return -EFAULT;