[NET]: Added GSO toggle

This patch adds a generic segmentation offload toggle that can be turned
on/off for each net device.  For now it only supports in TCPv4.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 0 deletions

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 33ce7ed6afc6..27ce1683caf5 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -614,6 +614,29 @@ static int ethtool_set_ufo(struct net_device *dev, char __user *useraddr)
         return dev->ethtool_ops->set_ufo(dev, edata.data);
 }
 
+static int ethtool_get_gso(struct net_device *dev, char __user *useraddr)
+{
+        struct ethtool_value edata = { ETHTOOL_GGSO };
+
+        edata.data = dev->features & NETIF_F_GSO;
+        if (copy_to_user(useraddr, &edata, sizeof(edata)))
+                 return -EFAULT;
+        return 0;
+}
+
+static int ethtool_set_gso(struct net_device *dev, char __user *useraddr)
+{
+        struct ethtool_value edata;
+
+        if (copy_from_user(&edata, useraddr, sizeof(edata)))
+                return -EFAULT;
+        if (edata.data)
+                dev->features |= NETIF_F_GSO;
+        else
+                dev->features &= ~NETIF_F_GSO;
+        return 0;
+}
+
 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 {
         struct ethtool_test test;
@@ -905,6 +928,12 @@ int dev_ethtool(struct ifreq *ifr)
         case ETHTOOL_SUFO:
                 rc = ethtool_set_ufo(dev, useraddr);
                 break;
+        case ETHTOOL_GGSO:
+                rc = ethtool_get_gso(dev, useraddr);
+                break;
+        case ETHTOOL_SGSO:
+                rc = ethtool_set_gso(dev, useraddr);
+                break;
         default:
                 rc =  -EOPNOTSUPP;
         }