netdev - [PoC PATCH] net: convert xen-netfront to hw

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Date:	Thu, 10 Mar 2011 18:47:27 +0100 (CET)
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Francois Romieu <romieu@...zoreil.com>
Subject: [PoC PATCH] net: convert xen-netfront to hw_features

[resent because of broken headers]

This patch converts xen-netfront to hw_features.

It's 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.

netdev_update_features() should be called whenever offload conditions change.
This in turn calls ndo_fix_features() and ndo_set_features() to verify them.
I leave this to you as I don't know when or how the notifications get passed.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/net/xen-netfront.c |   57 +++++++++++++++++--------------------------
 1 files changed, 23 insertions(+), 34 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index da1f121..c642fd3 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);
@@ -1510,52 +1514,40 @@ 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;
+			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);
+	if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
+		netdev_info(dev, "Reducing MTU because no SG offload");
+		dev->mtu = ETH_DATA_LEN;
+	}
 
-	/* We need checksum offload to enable scatter/gather and TSO. */
-	if (!(dev->features & NETIF_F_IP_CSUM))
-		return;
-
-	if (!xennet_set_sg(dev, 1))
-		xennet_set_tso(dev, 1);
+	return 0;
 }
 
 static int xennet_connect(struct net_device *dev)
@@ -1582,7 +1574,7 @@ 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);
@@ -1710,9 +1702,6 @@ 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,
-- 
1.7.2.3

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