[RFC PATCH] bonding: convert bond_compute_features() to ndo_fix/set_features

["Michał Mirosław" <mirq-linux@rere.qmqm.pl>]

Note: Updating of vlan_features is and was broken, as its not propagated
to vlan devices already created ontop of the bond.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/net/bonding/bond_main.c |   45 +++++++++++++++++++++++++-------------
 1 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 16d6fe9..73d2661 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1396,29 +1396,42 @@ static int bond_sethwaddr(struct net_device *bond_dev,
  * feature bits are managed elsewhere, so preserve those feature bits
  * on the master device.
  */
-static int bond_compute_features(struct bonding *bond)
+static u32 bond_fix_features(struct net_device *bond_dev, u32 features)
 {
+	struct bonding *bond = netdev_priv(bond_dev);
 	struct slave *slave;
-	struct net_device *bond_dev = bond->dev;
-	u32 features = bond_dev->features;
-	u32 vlan_features = 0;
-	unsigned short max_hard_header_len = max((u16)ETH_HLEN,
-						bond_dev->hard_header_len);
 	int i;
 
 	features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
 	features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
 
 	if (!bond->first_slave)
-		goto done;
+		return features;
 
 	features &= ~NETIF_F_ONE_FOR_ALL;
 
-	vlan_features = bond->first_slave->dev->vlan_features;
 	bond_for_each_slave(bond, slave, i) {
 		features = netdev_increment_features(features,
 						     slave->dev->features,
 						     NETIF_F_ONE_FOR_ALL);
+	}
+
+	return features;
+}
+
+static int bond_set_features(struct net_device *bond_dev, u32 features)
+{
+	struct bonding *bond = netdev_priv(bond_dev);
+	struct slave *slave;
+	unsigned short max_hard_header_len = ETH_HLEN;
+	u32 vlan_features = 0;
+	int i;
+
+	if (!bond->first_slave)
+		return 0;
+
+	vlan_features = bond->first_slave->dev->vlan_features;
+	bond_for_each_slave(bond, slave, i) {
 		vlan_features = netdev_increment_features(vlan_features,
 							slave->dev->vlan_features,
 							NETIF_F_ONE_FOR_ALL);
@@ -1426,10 +1439,8 @@ static int bond_compute_features(struct bonding *bond)
 			max_hard_header_len = slave->dev->hard_header_len;
 	}
 
-done:
-	features |= (bond_dev->features & BOND_VLAN_FEATURES);
-	bond_dev->features = netdev_fix_features(bond_dev, features);
-	bond_dev->vlan_features = netdev_fix_features(bond_dev, vlan_features);
+	/* vlan_features will be trimmed by vlan devices */
+	bond_dev->vlan_features = vlan_features;
 	bond_dev->hard_header_len = max_hard_header_len;
 
 	return 0;
@@ -1757,7 +1768,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	new_slave->delay = 0;
 	new_slave->link_failure_count = 0;
 
-	bond_compute_features(bond);
+	netdev_update_features(bond_dev);
 
 	write_unlock_bh(&bond->lock);
 
@@ -2021,7 +2032,7 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 	/* release the slave from its bond */
 	bond_detach_slave(bond, slave);
 
-	bond_compute_features(bond);
+	netdev_update_features(bond_dev);
 
 	if (bond->primary_slave == slave)
 		bond->primary_slave = NULL;
@@ -2201,7 +2212,7 @@ static int bond_release_all(struct net_device *bond_dev)
 			bond_alb_deinit_slave(bond, slave);
 		}
 
-		bond_compute_features(bond);
+		netdev_update_features(bond_dev);
 
 		bond_destroy_slave_symlinks(bond_dev, slave_dev);
 		bond_del_vlans_from_slave(bond, slave_dev);
@@ -3380,7 +3391,7 @@ static int bond_slave_netdev_event(unsigned long event,
 		 */
 		break;
 	case NETDEV_FEAT_CHANGE:
-		bond_compute_features(bond);
+		netdev_update_features(bond_dev);
 		break;
 	default:
 		break;
@@ -4478,6 +4489,8 @@ static const struct net_device_ops bond_netdev_ops = {
 #endif
 	.ndo_add_slave		= bond_enslave,
 	.ndo_del_slave		= bond_release,
+	.ndo_fix_features	= bond_fix_features,
+	.ndo_set_features	= bond_set_features,
 };
 
 static void bond_destructor(struct net_device *bond_dev)
-- 
1.7.2.5