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net: Introduce new feature setting ops

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This introduces a new framework to handle device features setting.
It consists of:
  - new fields in struct net_device:
	+ hw_features - features that hw/driver supports toggling
	+ wanted_features - features that user wants enabled, when possible
  - new netdev_ops:
	+ feat = ndo_fix_features(dev, feat) - API checking constraints for
		enabling features or their combinations
	+ ndo_set_features(dev) - API updating hardware state to match
		changed dev->features
  - new ethtool commands:
	+ ETHTOOL_GFEATURES/ETHTOOL_SFEATURES: get/set dev->wanted_features
		and trigger device reconfiguration if resulting dev->features
		changed
	+ ETHTOOL_GSTRINGS(ETH_SS_FEATURES): get feature bits names (meaning)

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michał Mirosław
2011-02-15 16:59:17 +00:00
committed by David S. Miller
parent 0a41770477
commit 5455c6998d
4 changed files with 283 additions and 10 deletions
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46
net/core/dev.c
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@@ -5302,6 +5302,37 @@ u32 netdev_fix_features(struct net_device *dev, u32 features)
}
EXPORT_SYMBOL(netdev_fix_features);
void netdev_update_features(struct net_device *dev)
{
u32 features;
int err = 0;
features = netdev_get_wanted_features(dev);
if (dev->netdev_ops->ndo_fix_features)
features = dev->netdev_ops->ndo_fix_features(dev, features);
/* driver might be less strict about feature dependencies */
features = netdev_fix_features(dev, features);
if (dev->features == features)
return;
netdev_info(dev, "Features changed: 0x%08x -> 0x%08x\n",
dev->features, features);
if (dev->netdev_ops->ndo_set_features)
err = dev->netdev_ops->ndo_set_features(dev, features);
if (!err)
dev->features = features;
else if (err < 0)
netdev_err(dev,
"set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
err, features, dev->features);
}
EXPORT_SYMBOL(netdev_update_features);
/**
* netif_stacked_transfer_operstate - transfer operstate
* @rootdev: the root or lower level device to transfer state from
@@ -5436,15 +5467,18 @@ int register_netdevice(struct net_device *dev)
if (dev->iflink == -1)
dev->iflink = dev->ifindex;
/* Enable software offloads by default - will be stripped in
* netdev_fix_features() if not supported. */
dev->features |= NETIF_F_SOFT_FEATURES;
/* Transfer changeable features to wanted_features and enable
* software offloads (GSO and GRO).
*/
dev->hw_features |= NETIF_F_SOFT_FEATURES;
dev->wanted_features = (dev->features & dev->hw_features)
| NETIF_F_SOFT_FEATURES;
/* Avoid warning from netdev_fix_features() for GSO without SG */
if (!(dev->features & NETIF_F_SG))
dev->features &= ~NETIF_F_GSO;
if (!(dev->wanted_features & NETIF_F_SG))
dev->wanted_features &= ~NETIF_F_GSO;
dev->features = netdev_fix_features(dev, dev->features);
netdev_update_features(dev);
/* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
* vlan_dev_init() will do the dev->features check, so these features