netdev: Add support for rx flow hash configuration, using ethtool.

Added new interfaces to ethtool to configure receive network flow
distribution across multiple rx rings using hashing.

Signed-off-by: Santwona Behera <santwona.behera@sun.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 0 deletions

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 0133b5ebd545..14ada537f895 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -209,6 +209,36 @@ static int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr)
         return 0;
 }
 
+static int ethtool_set_rxhash(struct net_device *dev, void __user *useraddr)
+{
+        struct ethtool_rxnfc cmd;
+
+        if (!dev->ethtool_ops->set_rxhash)
+                return -EOPNOTSUPP;
+
+        if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
+                return -EFAULT;
+
+        return dev->ethtool_ops->set_rxhash(dev, &cmd);
+}
+
+static int ethtool_get_rxhash(struct net_device *dev, void __user *useraddr)
+{
+        struct ethtool_rxnfc info;
+
+        if (!dev->ethtool_ops->get_rxhash)
+                return -EOPNOTSUPP;
+
+        if (copy_from_user(&info, useraddr, sizeof(info)))
+                return -EFAULT;
+
+        dev->ethtool_ops->get_rxhash(dev, &info);
+
+        if (copy_to_user(useraddr, &info, sizeof(info)))
+                return -EFAULT;
+        return 0;
+}
+
 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
 {
         struct ethtool_regs regs;
@@ -826,6 +856,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
         case ETHTOOL_GGSO:
         case ETHTOOL_GFLAGS:
         case ETHTOOL_GPFLAGS:
+        case ETHTOOL_GRXFH:
                 break;
         default:
                 if (!capable(CAP_NET_ADMIN))
@@ -977,6 +1008,12 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
                 rc = ethtool_set_value(dev, useraddr,
                                        dev->ethtool_ops->set_priv_flags);
                 break;
+        case ETHTOOL_GRXFH:
+                rc = ethtool_get_rxhash(dev, useraddr);
+                break;
+        case ETHTOOL_SRXFH:
+                rc = ethtool_set_rxhash(dev, useraddr);
+                break;
         default:
                 rc = -EOPNOTSUPP;
         }