[PATCH] net: forcedeth: convert to hw_features

[PATCH] net: forcedeth: convert to hw_features

[Michał Mirosław]

This also fixes a race around np->txrxctl_bits while changing RXCSUM offload.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/net/forcedeth.c |   78 +++++++++++++++-------------------------------
 1 files changed, 26 insertions(+), 52 deletions(-)

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index d5ab4da..ec9a32d 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -774,7 +774,6 @@ struct fe_priv {
 	u32 driver_data;
 	u32 device_id;
 	u32 register_size;
-	int rx_csum;
 	u32 mac_in_use;
 	int mgmt_version;
 	int mgmt_sema;
@@ -4480,58 +4479,36 @@ static int nv_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam*
 	return 0;
 }
 
-static u32 nv_get_rx_csum(struct net_device *dev)
+static u32 nv_fix_features(struct net_device *dev, u32 features)
 {
-	struct fe_priv *np = netdev_priv(dev);
-	return np->rx_csum != 0;
+	/* vlan is dependent on rx checksum offload */
+	if (features & (NETIF_F_HW_VLAN_TX|NETIF_F_HW_VLAN_RX))
+		features |= NETIF_F_RXCSUM;
+
+	return features;
 }
 
-static int nv_set_rx_csum(struct net_device *dev, u32 data)
+static int nv_set_features(struct net_device *dev, u32 features)
 {
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	int retcode = 0;
+	u32 changed = dev->features ^ features;
 
-	if (np->driver_data & DEV_HAS_CHECKSUM) {
-		if (data) {
-			np->rx_csum = 1;
+	if (changed & NETIF_F_RXCSUM) {
+		spin_lock_irq(&np->lock);
+
+		if (features & NETIF_F_RXCSUM)
 			np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
-		} else {
-			np->rx_csum = 0;
-			/* vlan is dependent on rx checksum offload */
-			if (!(np->vlanctl_bits & NVREG_VLANCONTROL_ENABLE))
-				np->txrxctl_bits &= ~NVREG_TXRXCTL_RXCHECK;
-		}
-		if (netif_running(dev)) {
-			spin_lock_irq(&np->lock);
+		else
+			np->txrxctl_bits &= ~NVREG_TXRXCTL_RXCHECK;
+
+		if (netif_running(dev))
 			writel(np->txrxctl_bits, base + NvRegTxRxControl);
-			spin_unlock_irq(&np->lock);
-		}
-	} else {
-		return -EINVAL;
+
+		spin_unlock_irq(&np->lock);
 	}
 
-	return retcode;
-}
-
-static int nv_set_tx_csum(struct net_device *dev, u32 data)
-{
-	struct fe_priv *np = netdev_priv(dev);
-
-	if (np->driver_data & DEV_HAS_CHECKSUM)
-		return ethtool_op_set_tx_csum(dev, data);
-	else
-		return -EOPNOTSUPP;
-}
-
-static int nv_set_sg(struct net_device *dev, u32 data)
-{
-	struct fe_priv *np = netdev_priv(dev);
-
-	if (np->driver_data & DEV_HAS_CHECKSUM)
-		return ethtool_op_set_sg(dev, data);
-	else
-		return -EOPNOTSUPP;
+	return 0;
 }
 
 static int nv_get_sset_count(struct net_device *dev, int sset)
@@ -4896,15 +4873,10 @@ static const struct ethtool_ops ops = {
 	.get_regs_len = nv_get_regs_len,
 	.get_regs = nv_get_regs,
 	.nway_reset = nv_nway_reset,
-	.set_tso = nv_set_tso,
 	.get_ringparam = nv_get_ringparam,
 	.set_ringparam = nv_set_ringparam,
 	.get_pauseparam = nv_get_pauseparam,
 	.set_pauseparam = nv_set_pauseparam,
-	.get_rx_csum = nv_get_rx_csum,
-	.set_rx_csum = nv_set_rx_csum,
-	.set_tx_csum = nv_set_tx_csum,
-	.set_sg = nv_set_sg,
 	.get_strings = nv_get_strings,
 	.get_ethtool_stats = nv_get_ethtool_stats,
 	.get_sset_count = nv_get_sset_count,
@@ -5235,6 +5207,8 @@ static const struct net_device_ops nv_netdev_ops = {
 	.ndo_start_xmit		= nv_start_xmit,
 	.ndo_tx_timeout		= nv_tx_timeout,
 	.ndo_change_mtu		= nv_change_mtu,
+	.ndo_fix_features	= nv_fix_features,
+	.ndo_set_features	= nv_set_features,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_mac_address	= nv_set_mac_address,
 	.ndo_set_multicast_list	= nv_set_multicast,
@@ -5251,6 +5225,8 @@ static const struct net_device_ops nv_netdev_ops_optimized = {
 	.ndo_start_xmit		= nv_start_xmit_optimized,
 	.ndo_tx_timeout		= nv_tx_timeout,
 	.ndo_change_mtu		= nv_change_mtu,
+	.ndo_fix_features	= nv_fix_features,
+	.ndo_set_features	= nv_set_features,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_mac_address	= nv_set_mac_address,
 	.ndo_set_multicast_list	= nv_set_multicast,
@@ -5364,11 +5340,10 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 		np->pkt_limit = NV_PKTLIMIT_2;
 
 	if (id->driver_data & DEV_HAS_CHECKSUM) {
-		np->rx_csum = 1;
 		np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
-		dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
-		dev->features |= NETIF_F_TSO;
-		dev->features |= NETIF_F_GRO;
+		dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_SG |
+			NETIF_F_TSO | NETIF_F_RXCSUM;
+		dev->features |= dev->hw_features;
 	}
 
 	np->vlanctl_bits = 0;
@@ -5384,7 +5359,6 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 		np->pause_flags |= NV_PAUSEFRAME_TX_CAPABLE | NV_PAUSEFRAME_TX_REQ;
 	}
 
-
 	err = -ENOMEM;
 	np->base = ioremap(addr, np->register_size);
 	if (!np->base)
-- 
1.7.2.5

Re: [PATCH] net: forcedeth: convert to hw_features

[Ben Hutchings]

On Fri, 2011-04-15 at 16:50 +0200, Michał Mirosław wrote:
> This also fixes a race around np->txrxctl_bits while changing RXCSUM offload.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
>  drivers/net/forcedeth.c |   78 +++++++++++++++-------------------------------
>  1 files changed, 26 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
> index d5ab4da..ec9a32d 100644
> --- a/drivers/net/forcedeth.c
> +++ b/drivers/net/forcedeth.c
> @@ -774,7 +774,6 @@ struct fe_priv {
>  	u32 driver_data;
>  	u32 device_id;
>  	u32 register_size;
> -	int rx_csum;
>  	u32 mac_in_use;
>  	int mgmt_version;
>  	int mgmt_sema;
> @@ -4480,58 +4479,36 @@ static int nv_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam*
>  	return 0;
>  }
>  
> -static u32 nv_get_rx_csum(struct net_device *dev)
> +static u32 nv_fix_features(struct net_device *dev, u32 features)
>  {
> -	struct fe_priv *np = netdev_priv(dev);
> -	return np->rx_csum != 0;
> +	/* vlan is dependent on rx checksum offload */
> +	if (features & (NETIF_F_HW_VLAN_TX|NETIF_F_HW_VLAN_RX))
> +		features |= NETIF_F_RXCSUM;
[...]

Shouldn't this be done the other way round:

	if (!(features & NETIF_F_RXCSUM))
		features &= ~(NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX);

So long as the VLAN feature flags are still set in wanted_features, they
will be turned back on automatically if RXCSUM is re-enabled.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

Re: [PATCH] net: forcedeth: convert to hw_features

[Michał Mirosław]

On Fri, Apr 15, 2011 at 05:39:48PM +0100, Ben Hutchings wrote:
> On Fri, 2011-04-15 at 16:50 +0200, Michał Mirosław wrote:
> > This also fixes a race around np->txrxctl_bits while changing RXCSUM offload.
> > 
> > Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> > ---
> >  drivers/net/forcedeth.c |   78 +++++++++++++++-------------------------------
> >  1 files changed, 26 insertions(+), 52 deletions(-)
> > 
> > diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
> > index d5ab4da..ec9a32d 100644
> > --- a/drivers/net/forcedeth.c
> > +++ b/drivers/net/forcedeth.c
> > @@ -774,7 +774,6 @@ struct fe_priv {
> >  	u32 driver_data;
> >  	u32 device_id;
> >  	u32 register_size;
> > -	int rx_csum;
> >  	u32 mac_in_use;
> >  	int mgmt_version;
> >  	int mgmt_sema;
> > @@ -4480,58 +4479,36 @@ static int nv_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam*
> >  	return 0;
> >  }
> >  
> > -static u32 nv_get_rx_csum(struct net_device *dev)
> > +static u32 nv_fix_features(struct net_device *dev, u32 features)
> >  {
> > -	struct fe_priv *np = netdev_priv(dev);
> > -	return np->rx_csum != 0;
> > +	/* vlan is dependent on rx checksum offload */
> > +	if (features & (NETIF_F_HW_VLAN_TX|NETIF_F_HW_VLAN_RX))
> > +		features |= NETIF_F_RXCSUM;
> [...]
> 
> Shouldn't this be done the other way round:
> 
> 	if (!(features & NETIF_F_RXCSUM))
> 		features &= ~(NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX);
> 
> So long as the VLAN feature flags are still set in wanted_features, they
> will be turned back on automatically if RXCSUM is re-enabled.

Yes, but this way is a direct translation from old ethtool_ops. Changing
this needs implementing changing HW_VLAN features in set_features.

Best Regards,
Michał Mirosław

Re: [PATCH] net: forcedeth: convert to hw_features

[David Miller]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Date: Fri, 15 Apr 2011 16:50:49 +0200 (CEST)

> This also fixes a race around np->txrxctl_bits while changing RXCSUM offload.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Applied.