[PATCH] bonding: allow bond to use TSO if slaves support it

Add NETIF_F_TSO (NETIF_F_UFO) to BOND_INTERSECT_FEATURES so that it can
be used by a bonding device iff all its slave devices support TSO (UFO).

Signed-off-by: Arthur Kepner <akepner@sgi.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 4ff006c37626..e0f51afec778 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1145,7 +1145,8 @@ int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
 }
 
 #define BOND_INTERSECT_FEATURES \
-        (NETIF_F_SG|NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)
+        (NETIF_F_SG|NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM|\
+        NETIF_F_TSO|NETIF_F_UFO)
 
 /* 
  * Compute the common dev->feature set available to all slaves.  Some
@@ -1168,6 +1169,16 @@ static int bond_compute_features(struct bonding *bond)
                           NETIF_F_HW_CSUM)))
                 features &= ~NETIF_F_SG;
 
+        /* 
+         * features will include NETIF_F_TSO (NETIF_F_UFO) iff all 
+         * slave devices support NETIF_F_TSO (NETIF_F_UFO), which 
+         * implies that all slaves also support scatter-gather 
+         * (NETIF_F_SG), which implies that features also includes 
+         * NETIF_F_SG. So no need to check whether we have an  
+         * illegal combination of NETIF_F_{TSO,UFO} and 
+         * !NETIF_F_SG 
+         */
+
         features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
         bond_dev->features = features;
 
@@ -4080,6 +4091,8 @@ static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
 
 static struct ethtool_ops bond_ethtool_ops = {
         .get_tx_csum            = ethtool_op_get_tx_csum,
+        .get_tso                = ethtool_op_get_tso,
+        .get_ufo                = ethtool_op_get_ufo,
         .get_sg                 = ethtool_op_get_sg,
         .get_drvinfo            = bond_ethtool_get_drvinfo,
 };