netdev: ethtool RXHASH flag

This adds ethtool and device feature flag to allow control
of receive hashing offload.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index b33f316bb92e..b391969a0dd9 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -310,6 +310,7 @@ struct ethtool_perm_addr {
 enum ethtool_flags {
         ETH_FLAG_LRO            = (1 << 15),    /* LRO is enabled */
         ETH_FLAG_NTUPLE         = (1 << 27),    /* N-tuple filters enabled */
+        ETH_FLAG_RXHASH         = (1 << 28),
 };
 
 /* The following structures are for supporting RX network flow
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 53c272f2a734..b5670ab5107c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -785,6 +785,7 @@ struct net_device {
 #define NETIF_F_SCTP_CSUM       (1 << 25) /* SCTP checksum offload */
 #define NETIF_F_FCOE_MTU        (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
 #define NETIF_F_NTUPLE          (1 << 27) /* N-tuple filters supported */
+#define NETIF_F_RXHASH          (1 << 28) /* Receive hashing offload */
 
         /* Segmentation offload features */
 #define NETIF_F_GSO_SHIFT       16
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index f4cb6b6299d9..73c81edde8d9 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -121,7 +121,7 @@ int ethtool_op_set_ufo(struct net_device *dev, u32 data)
  * NETIF_F_xxx values in include/linux/netdevice.h
  */
 static const u32 flags_dup_features =
-        (ETH_FLAG_LRO | ETH_FLAG_NTUPLE);
+        (ETH_FLAG_LRO | ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH);
 
 u32 ethtool_op_get_flags(struct net_device *dev)
 {
@@ -152,6 +152,11 @@ int ethtool_op_set_flags(struct net_device *dev, u32 data)
                 features &= ~NETIF_F_NTUPLE;
         }
 
+        if (data & ETH_FLAG_RXHASH)
+                features |= NETIF_F_RXHASH;
+        else
+                features &= ~NETIF_F_RXHASH;
+
         dev->features = features;
         return 0;
 }