net: Fix too optimistic NETIF_F_HW_CSUM features

NETIF_F_HW_CSUM is a superset of NETIF_F_IP_CSUM+NETIF_F_IPV6_CSUM, but
some drivers miss the difference. Fix this and also fix UFO dependency
on checksumming offload as it makes the same mistake in assumptions.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Jon Mason <jon.mason@exar.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 35 insertions, 51 deletions

diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index 102567ee68c..275428032ce 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -2583,10 +2583,12 @@ static void be_netdev_init(struct net_device *netdev)
 	int i;
 
 	netdev->features |= NETIF_F_SG | NETIF_F_HW_VLAN_RX | NETIF_F_TSO |
-		NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_FILTER | NETIF_F_HW_CSUM |
+		NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_FILTER |
+		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 		NETIF_F_GRO | NETIF_F_TSO6;
 
-	netdev->vlan_features |= NETIF_F_SG | NETIF_F_TSO | NETIF_F_HW_CSUM;
+	netdev->vlan_features |= NETIF_F_SG | NETIF_F_TSO |
+		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 
 	if (lancer_chip(adapter))
 		netdev->vlan_features |= NETIF_F_TSO6;
diff --git a/drivers/net/bnx2x/bnx2x_main.c b/drivers/net/bnx2x/bnx2x_main.c
index 1552fc3c135..0068a1dbc06 100644
--- a/drivers/net/bnx2x/bnx2x_main.c
+++ b/drivers/net/bnx2x/bnx2x_main.c
@@ -8957,7 +8957,7 @@ static int __devinit bnx2x_init_dev(struct pci_dev *pdev,
 	dev->netdev_ops = &bnx2x_netdev_ops;
 	bnx2x_set_ethtool_ops(dev);
 	dev->features |= NETIF_F_SG;
-	dev->features |= NETIF_F_HW_CSUM;
+	dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	if (bp->flags & USING_DAC_FLAG)
 		dev->features |= NETIF_F_HIGHDMA;
 	dev->features |= (NETIF_F_TSO | NETIF_F_TSO_ECN);
@@ -8965,7 +8965,7 @@ static int __devinit bnx2x_init_dev(struct pci_dev *pdev,
 	dev->features |= (NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX);
 
 	dev->vlan_features |= NETIF_F_SG;
-	dev->vlan_features |= NETIF_F_HW_CSUM;
+	dev->vlan_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	if (bp->flags & USING_DAC_FLAG)
 		dev->vlan_features |= NETIF_F_HIGHDMA;
 	dev->vlan_features |= (NETIF_F_TSO | NETIF_F_TSO_ECN);
diff --git a/drivers/net/jme.c b/drivers/net/jme.c
index c57d9a43cec..2411e72ba57 100644
--- a/drivers/net/jme.c
+++ b/drivers/net/jme.c
@@ -2076,12 +2076,11 @@ jme_change_mtu(struct net_device *netdev, int new_mtu)
 	}
 
 	if (new_mtu > 1900) {
-		netdev->features &= ~(NETIF_F_HW_CSUM |
-				NETIF_F_TSO |
-				NETIF_F_TSO6);
+		netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+				NETIF_F_TSO | NETIF_F_TSO6);
 	} else {
 		if (test_bit(JME_FLAG_TXCSUM, &jme->flags))
-			netdev->features |= NETIF_F_HW_CSUM;
+			netdev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 		if (test_bit(JME_FLAG_TSO, &jme->flags))
 			netdev->features |= NETIF_F_TSO | NETIF_F_TSO6;
 	}
@@ -2514,10 +2513,12 @@ jme_set_tx_csum(struct net_device *netdev, u32 on)
 	if (on) {
 		set_bit(JME_FLAG_TXCSUM, &jme->flags);
 		if (netdev->mtu <= 1900)
-			netdev->features |= NETIF_F_HW_CSUM;
+			netdev->features |=
+				NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	} else {
 		clear_bit(JME_FLAG_TXCSUM, &jme->flags);
-		netdev->features &= ~NETIF_F_HW_CSUM;
+		netdev->features &=
+				~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
 	}
 
 	return 0;
@@ -2797,7 +2798,8 @@ jme_init_one(struct pci_dev *pdev,
 	netdev->netdev_ops = &jme_netdev_ops;
 	netdev->ethtool_ops		= &jme_ethtool_ops;
 	netdev->watchdog_timeo		= TX_TIMEOUT;
-	netdev->features		=	NETIF_F_HW_CSUM |
+	netdev->features		=	NETIF_F_IP_CSUM |
+						NETIF_F_IPV6_CSUM |
 						NETIF_F_SG |
 						NETIF_F_TSO |
 						NETIF_F_TSO6 |
diff --git a/drivers/net/pch_gbe/pch_gbe_ethtool.c b/drivers/net/pch_gbe/pch_gbe_ethtool.c
index c8cc32c0edc..c8c873b31a8 100644
--- a/drivers/net/pch_gbe/pch_gbe_ethtool.c
+++ b/drivers/net/pch_gbe/pch_gbe_ethtool.c
@@ -469,18 +469,6 @@ static int pch_gbe_set_rx_csum(struct net_device *netdev, u32 data)
 }
 
 /**
- * pch_gbe_get_tx_csum - Report whether transmit checksums are turned on or off
- * @netdev:  Network interface device structure
- * Returns
- *	true(1):  Checksum On
- *	false(0): Checksum Off
- */
-static u32 pch_gbe_get_tx_csum(struct net_device *netdev)
-{
-	return (netdev->features & NETIF_F_HW_CSUM) != 0;
-}
-
-/**
  * pch_gbe_set_tx_csum - Turn transmit checksums on or off
  * @netdev: Network interface device structure
  * @data:   Checksum on[true] or off[false]
@@ -493,11 +481,7 @@ static int pch_gbe_set_tx_csum(struct net_device *netdev, u32 data)
 	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
 
 	adapter->tx_csum = data;
-	if (data)
-		netdev->features |= NETIF_F_HW_CSUM;
-	else
-		netdev->features &= ~NETIF_F_HW_CSUM;
-	return 0;
+	return ethtool_op_set_tx_ipv6_csum(netdev, data);
 }
 
 /**
@@ -572,7 +556,6 @@ static const struct ethtool_ops pch_gbe_ethtool_ops = {
 	.set_pauseparam = pch_gbe_set_pauseparam,
 	.get_rx_csum = pch_gbe_get_rx_csum,
 	.set_rx_csum = pch_gbe_set_rx_csum,
-	.get_tx_csum = pch_gbe_get_tx_csum,
 	.set_tx_csum = pch_gbe_set_tx_csum,
 	.get_strings = pch_gbe_get_strings,
 	.get_ethtool_stats = pch_gbe_get_ethtool_stats,
diff --git a/drivers/net/pch_gbe/pch_gbe_main.c b/drivers/net/pch_gbe/pch_gbe_main.c
index afb75066b14..58e79033a8e 100644
--- a/drivers/net/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/pch_gbe/pch_gbe_main.c
@@ -2319,7 +2319,7 @@ static int pch_gbe_probe(struct pci_dev *pdev,
 	netdev->watchdog_timeo = PCH_GBE_WATCHDOG_PERIOD;
 	netif_napi_add(netdev, &adapter->napi,
 		       pch_gbe_napi_poll, PCH_GBE_RX_WEIGHT);
-	netdev->features = NETIF_F_HW_CSUM | NETIF_F_GRO;
+	netdev->features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_GRO;
 	pch_gbe_set_ethtool_ops(netdev);
 
 	pch_gbe_mac_reset_hw(&adapter->hw);
@@ -2358,9 +2358,9 @@ static int pch_gbe_probe(struct pci_dev *pdev,
 	pch_gbe_check_options(adapter);
 
 	if (adapter->tx_csum)
-		netdev->features |= NETIF_F_HW_CSUM;
+		netdev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	else
-		netdev->features &= ~NETIF_F_HW_CSUM;
+		netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
 
 	/* initialize the wol settings based on the eeprom settings */
 	adapter->wake_up_evt = PCH_GBE_WL_INIT_SETTING;
diff --git a/drivers/net/sc92031.c b/drivers/net/sc92031.c
index 417adf37282..76290a8c3c1 100644
--- a/drivers/net/sc92031.c
+++ b/drivers/net/sc92031.c
@@ -1449,7 +1449,8 @@ static int __devinit sc92031_probe(struct pci_dev *pdev,
 	dev->irq = pdev->irq;
 
 	/* faked with skb_copy_and_csum_dev */
-	dev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA;
+	dev->features = NETIF_F_SG | NETIF_F_HIGHDMA |
+		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 
 	dev->netdev_ops		= &sc92031_netdev_ops;
 	dev->watchdog_timeo	= TX_TIMEOUT;
diff --git a/drivers/net/stmmac/stmmac_ethtool.c b/drivers/net/stmmac/stmmac_ethtool.c
index f2695fd180c..fd719edc7f7 100644
--- a/drivers/net/stmmac/stmmac_ethtool.c
+++ b/drivers/net/stmmac/stmmac_ethtool.c
@@ -197,16 +197,6 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
 	}
 }
 
-static int stmmac_ethtool_set_tx_csum(struct net_device *netdev, u32 data)
-{
-	if (data)
-		netdev->features |= NETIF_F_HW_CSUM;
-	else
-		netdev->features &= ~NETIF_F_HW_CSUM;
-
-	return 0;
-}
-
 static u32 stmmac_ethtool_get_rx_csum(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
@@ -370,7 +360,7 @@ static struct ethtool_ops stmmac_ethtool_ops = {
 	.get_link = ethtool_op_get_link,
 	.get_rx_csum = stmmac_ethtool_get_rx_csum,
 	.get_tx_csum = ethtool_op_get_tx_csum,
-	.set_tx_csum = stmmac_ethtool_set_tx_csum,
+	.set_tx_csum = ethtool_op_set_tx_ipv6_csum,
 	.get_sg = ethtool_op_get_sg,
 	.set_sg = ethtool_op_set_sg,
 	.get_pauseparam = stmmac_get_pauseparam,
diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c
index 730a6fd79ee..bfc2d125150 100644
--- a/drivers/net/stmmac/stmmac_main.c
+++ b/drivers/net/stmmac/stmmac_main.c
@@ -1494,7 +1494,8 @@ static int stmmac_probe(struct net_device *dev)
 	dev->netdev_ops = &stmmac_netdev_ops;
 	stmmac_set_ethtool_ops(dev);
 
-	dev->features |= (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA);
+	dev->features |= NETIF_F_SG | NETIF_F_HIGHDMA |
+		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	dev->watchdog_timeo = msecs_to_jiffies(watchdog);
 #ifdef STMMAC_VLAN_TAG_USED
 	/* Both mac100 and gmac support receive VLAN tag detection */
@@ -1525,7 +1526,7 @@ static int stmmac_probe(struct net_device *dev)
 
 	DBG(probe, DEBUG, "%s: Scatter/Gather: %s - HW checksums: %s\n",
 	    dev->name, (dev->features & NETIF_F_SG) ? "on" : "off",
-	    (dev->features & NETIF_F_HW_CSUM) ? "on" : "off");
+	    (dev->features & NETIF_F_IP_CSUM) ? "on" : "off");
 
 	spin_lock_init(&priv->lock);
 
diff --git a/drivers/net/vxge/vxge-ethtool.c b/drivers/net/vxge/vxge-ethtool.c
index bc9bd103570..1dd3a21b3a4 100644
--- a/drivers/net/vxge/vxge-ethtool.c
+++ b/drivers/net/vxge/vxge-ethtool.c
@@ -1177,7 +1177,7 @@ static const struct ethtool_ops vxge_ethtool_ops = {
 	.get_rx_csum		= vxge_get_rx_csum,
 	.set_rx_csum		= vxge_set_rx_csum,
 	.get_tx_csum		= ethtool_op_get_tx_csum,
-	.set_tx_csum		= ethtool_op_set_tx_hw_csum,
+	.set_tx_csum		= ethtool_op_set_tx_ipv6_csum,
 	.get_sg			= ethtool_op_get_sg,
 	.set_sg			= ethtool_op_set_sg,
 	.get_tso		= ethtool_op_get_tso,
diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index 8a84152e320..4877b3b8a29 100644
--- a/drivers/net/vxge/vxge-main.c
+++ b/drivers/net/vxge/vxge-main.c
@@ -3368,7 +3368,7 @@ static int __devinit vxge_device_register(struct __vxge_hw_device *hldev,
 
 	ndev->features |= NETIF_F_SG;
 
-	ndev->features |= NETIF_F_HW_CSUM;
+	ndev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	vxge_debug_init(vxge_hw_device_trace_level_get(hldev),
 		"%s : checksuming enabled", __func__);
 
diff --git a/net/core/dev.c b/net/core/dev.c
index cd243749542..55ff66fabce 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5041,10 +5041,13 @@ unsigned long netdev_fix_features(unsigned long features, const char *name)
 	}
 
 	if (features & NETIF_F_UFO) {
-		if (!(features & NETIF_F_GEN_CSUM)) {
+		/* maybe split UFO into V4 and V6? */
+		if (!((features & NETIF_F_GEN_CSUM) ||
+		    (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
+			    == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
 			if (name)
 				printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
-				       "since no NETIF_F_HW_CSUM feature.\n",
+				       "since no checksum offload features.\n",
 				       name);
 			features &= ~NETIF_F_UFO;
 		}
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 956a9f4971c..d5bc2881888 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1171,7 +1171,9 @@ static int ethtool_set_ufo(struct net_device *dev, char __user *useraddr)
 		return -EFAULT;
 	if (edata.data && !(dev->features & NETIF_F_SG))
 		return -EINVAL;
-	if (edata.data && !(dev->features & NETIF_F_HW_CSUM))
+	if (edata.data && !((dev->features & NETIF_F_GEN_CSUM) ||
+		(dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
+			== (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)))
 		return -EINVAL;
 	return dev->ethtool_ops->set_ufo(dev, edata.data);
 }