net: convert xen-netfront to hw_features

Not tested in any way. The original code for offload setting seems broken
as it resets the features on every netback reconnect.

This will set GSO_ROBUST at device creation time (earlier than connect time).

RX checksum offload is forced on - so advertise as it is.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 34 deletions

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index c06f5a09b263..f6e7e2726f6b 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1148,6 +1148,8 @@ static const struct net_device_ops xennet_netdev_ops = {
         .ndo_change_mtu      = xennet_change_mtu,
         .ndo_set_mac_address = eth_mac_addr,
         .ndo_validate_addr   = eth_validate_addr,
+        .ndo_fix_features    = xennet_fix_features,
+        .ndo_set_features    = xennet_set_features,
 };
 
 static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev)
@@ -1209,7 +1211,9 @@ static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev
         netdev->netdev_ops      = &xennet_netdev_ops;
 
         netif_napi_add(netdev, &np->napi, xennet_poll, 64);
-        netdev->features        = NETIF_F_IP_CSUM;
+        netdev->features        = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
+                                  NETIF_F_GSO_ROBUST;
+        netdev->hw_features     = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
 
         SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops);
         SET_NETDEV_DEV(netdev, &dev->dev);
@@ -1509,52 +1513,40 @@ again:
         return err;
 }
 
-static int xennet_set_sg(struct net_device *dev, u32 data)
+static u32 xennet_fix_features(struct net_device *dev, u32 features)
 {
-        if (data) {
-                struct netfront_info *np = netdev_priv(dev);
-                int val;
+        struct netfront_info *np = netdev_priv(dev);
+        int val;
 
+        if (features & NETIF_F_SG) {
                 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
                                  "%d", &val) < 0)
                         val = 0;
-                if (!val)
-                        return -ENOSYS;
-        } else if (dev->mtu > ETH_DATA_LEN)
-                dev->mtu = ETH_DATA_LEN;
 
-        return ethtool_op_set_sg(dev, data);
-}
-
-static int xennet_set_tso(struct net_device *dev, u32 data)
-{
-        if (data) {
-                struct netfront_info *np = netdev_priv(dev);
-                int val;
+                if (!val)
+                        features &= ~NETIF_F_SG;
+        }
 
+        if (features & NETIF_F_TSO) {
                 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
                                  "feature-gso-tcpv4", "%d", &val) < 0)
                         val = 0;
+
                 if (!val)
-                        return -ENOSYS;
+                        features &= ~NETIF_F_TSO;
         }
 
-        return ethtool_op_set_tso(dev, data);
+        return features;
 }
 
-static void xennet_set_features(struct net_device *dev)
+static int xennet_set_features(struct net_device *dev, u32 features)
 {
-        /* Turn off all GSO bits except ROBUST. */
-        dev->features &= ~NETIF_F_GSO_MASK;
-        dev->features |= NETIF_F_GSO_ROBUST;
-        xennet_set_sg(dev, 0);
-
-        /* We need checksum offload to enable scatter/gather and TSO. */
-        if (!(dev->features & NETIF_F_IP_CSUM))
-                return;
+        if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
+                netdev_info(dev, "Reducing MTU because no SG offload");
+                dev->mtu = ETH_DATA_LEN;
+        }
 
-        if (!xennet_set_sg(dev, 1))
-                xennet_set_tso(dev, 1);
+        return 0;
 }
 
 static int xennet_connect(struct net_device *dev)
@@ -1581,7 +1573,7 @@ static int xennet_connect(struct net_device *dev)
         if (err)
                 return err;
 
-        xennet_set_features(dev);
+        netdev_update_features(dev);
 
         spin_lock_bh(&np->rx_lock);
         spin_lock_irq(&np->tx_lock);
@@ -1709,9 +1701,6 @@ static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
 
 static const struct ethtool_ops xennet_ethtool_ops =
 {
-        .set_tx_csum = ethtool_op_set_tx_csum,
-        .set_sg = xennet_set_sg,
-        .set_tso = xennet_set_tso,
         .get_link = ethtool_op_get_link,
 
         .get_sset_count = xennet_get_sset_count,