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ethtool: Report link-down while interface is down

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While an interface is down, many implementations of
ethtool_ops::get_link, including the default, ethtool_op_get_link(),
will report the last link state seen while the interface was up.  In
general the current physical link state is not available if the
interface is down.

Define ETHTOOL_GLINK to reflect whether the interface *and* any
physical port have a working link, and consistently return 0 when the
interface is down.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2010-12-09 12:08:35 +00:00
committed by David S. Miller
parent 29639059a0
commit e596e6e4d5
2 changed files with 18 additions and 3 deletions
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17
net/core/ethtool.c
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@@ -891,6 +891,20 @@ static int ethtool_nway_reset(struct net_device *dev)
return dev->ethtool_ops->nway_reset(dev);
}
static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
{
struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
if (!dev->ethtool_ops->get_link)
return -EOPNOTSUPP;
edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
if (copy_to_user(useraddr, &edata, sizeof(edata)))
return -EFAULT;
return 0;
}
static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
struct ethtool_eeprom eeprom;
@@ -1530,8 +1544,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
rc = ethtool_nway_reset(dev);
break;
case ETHTOOL_GLINK:
rc = ethtool_get_value(dev, useraddr, ethcmd,
dev->ethtool_ops->get_link);
rc = ethtool_get_link(dev, useraddr);
break;
case ETHTOOL_GEEPROM:
rc = ethtool_get_eeprom(dev, useraddr);