IPoIB: Set netdev offload features properly for child (VLAN) interfaces

Child devices were created without any offload features set, fix this by
moving the code that computes the features into generic function which is
now called through non-child and child device creation.
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>

-- v1 has a bug where the 'result' flag in ipoib_vlan_add may be used uninitialized
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib.h

@@ -507,6 +507,7 @@ int ipoib_pkey_dev_delay_open(struct net_device *dev);
 void ipoib_drain_cq(struct net_device *dev);
 
 void ipoib_set_ethtool_ops(struct net_device *dev);
+int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca);
 
 #ifdef CONFIG_INFINIBAND_IPOIB_CM
 

drivers/infiniband/ulp/ipoib/ipoib_main.c

@@ -1173,11 +1173,48 @@ int ipoib_add_pkey_attr(struct net_device *dev)
 	return device_create_file(&dev->dev, &dev_attr_pkey);
 }
 
+int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
+{
+	struct ib_device_attr *device_attr;
+	int result = -ENOMEM;
+
+	device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
+	if (!device_attr) {
+		printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
+		       hca->name, sizeof *device_attr);
+		return result;
+	}
+
+	result = ib_query_device(hca, device_attr);
+	if (result) {
+		printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
+		       hca->name, result);
+		kfree(device_attr);
+		return result;
+	}
+	priv->hca_caps = device_attr->device_cap_flags;
+
+	kfree(device_attr);
+
+	if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
+		set_bit(IPOIB_FLAG_CSUM, &priv->flags);
+		priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
+	}
+
+	if (lro)
+		priv->dev->features |= NETIF_F_LRO;
+
+	if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
+		priv->dev->features |= NETIF_F_TSO;
+
+	return 0;
+}
+
+
 static struct net_device *ipoib_add_port(const char *format,
 					 struct ib_device *hca, u8 port)
 {
 	struct ipoib_dev_priv *priv;
-	struct ib_device_attr *device_attr;
 	struct ib_port_attr attr;
 	int result = -ENOMEM;
 
@@ -1206,31 +1243,8 @@ static struct net_device *ipoib_add_port(const char *format,
 		goto device_init_failed;
 	}
 
-	device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
-	if (!device_attr) {
-		printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
-		       hca->name, sizeof *device_attr);
+	if (ipoib_set_dev_features(priv, hca))
 		goto device_init_failed;
-	}
-
-	result = ib_query_device(hca, device_attr);
-	if (result) {
-		printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
-		       hca->name, result);
-		kfree(device_attr);
-		goto device_init_failed;
-	}
-	priv->hca_caps = device_attr->device_cap_flags;
-
-	kfree(device_attr);
-
-	if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
-		set_bit(IPOIB_FLAG_CSUM, &priv->flags);
-		priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
-	}
-
-	if (lro)
-		priv->dev->features |= NETIF_F_LRO;
 
 	/*
 	 * Set the full membership bit, so that we join the right
@@ -1266,9 +1280,6 @@ static struct net_device *ipoib_add_port(const char *format,
 		goto event_failed;
 	}
 
-	if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
-		priv->dev->features |= NETIF_F_TSO;
-
 	result = register_netdev(priv->dev);
 	if (result) {
 		printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",

drivers/infiniband/ulp/ipoib/ipoib_vlan.c

@@ -93,6 +93,10 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 	priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
 	set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
 
+	result = ipoib_set_dev_features(priv, ppriv->ca);
+	if (result)
+		goto device_init_failed;
+
 	priv->pkey = pkey;
 
 	memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);