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ethtool: prepare for larger netdev_features_t type 

v2:	changed loop in ethtool_set_features() per Ben's suggestion

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 2011-11-15 15:29:55 +00:00 committed by David S. Miller
parent 9d921549b3
commit 475414f6f2
1 changed files with 26 additions and 16 deletions
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42
net/core/ethtool.c
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@ -38,7 +38,7 @@ EXPORT_SYMBOL(ethtool_op_get_link);
/* Handlers for each ethtool command */
#define ETHTOOL_DEV_FEATURE_WORDS 1
#define ETHTOOL_DEV_FEATURE_WORDS ((NETDEV_FEATURE_COUNT + 31) / 32)
static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
[NETIF_F_SG_BIT] = "tx-scatter-gather",
@ -82,16 +82,20 @@ static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
.cmd = ETHTOOL_GFEATURES,
.size = ETHTOOL_DEV_FEATURE_WORDS,
};
struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS] = {
{
.available = dev->hw_features,
.requested = dev->wanted_features,
.active = dev->features,
.never_changed = NETIF_F_NEVER_CHANGE,
},
};
struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
u32 __user *sizeaddr;
u32 copy_size;
int i;
/* in case feature bits run out again */
BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS*sizeof(u32) > sizeof(netdev_features_t));
for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
features[i].available = (u32)(dev->hw_features >> (32*i));
features[i].requested = (u32)(dev->wanted_features >> (32*i));
features[i].active = (u32)(dev->features >> (32*i));
features[i].never_changed = (u32)(NETIF_F_NEVER_CHANGE >> (32*i));
}
sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
if (get_user(copy_size, sizeaddr))
@ -113,7 +117,8 @@ static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
{
struct ethtool_sfeatures cmd;
struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
int ret = 0;
netdev_features_t wanted = 0, valid = 0;
int i, ret = 0;
if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
return -EFAULT;
@ -125,19 +130,24 @@ static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
if (copy_from_user(features, useraddr, sizeof(features)))
return -EFAULT;
if (features[0].valid & ~NETIF_F_ETHTOOL_BITS)
for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
valid |= (netdev_features_t)features[i].valid << (32*i);
wanted |= (netdev_features_t)features[i].requested << (32*i);
}
if (valid & ~NETIF_F_ETHTOOL_BITS)
return -EINVAL;
if (features[0].valid & ~dev->hw_features) {
features[0].valid &= dev->hw_features;
if (valid & ~dev->hw_features) {
valid &= dev->hw_features;
ret |= ETHTOOL_F_UNSUPPORTED;
}
dev->wanted_features &= ~features[0].valid;
dev->wanted_features |= features[0].valid & features[0].requested;
dev->wanted_features &= ~valid;
dev->wanted_features |= wanted & valid;
__netdev_update_features(dev);
if ((dev->wanted_features ^ dev->features) & features[0].valid)
if ((dev->wanted_features ^ dev->features) & valid)
ret |= ETHTOOL_F_WISH;
return ret;