diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2010-12-09 12:08:35 +0000 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2014-06-19 00:25:56 +0200 |
| commit | d100b2748ac930237a97646ae9a4721a7f62acc1 (patch) | |
| tree | 5fcee71d7e62fbbc17c01227e5cabbbd9d2cd46d /net | |
| parent | 7f62be2f53a2353a7e5c124075ec22a4344e8d57 (diff) | |
ethtool: Report link-down while interface is down
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>
(cherry picked from commit e596e6e4d578f2639416e620d367a3af34814a40)
Cc: Wang Weidong <wangweidong1@huawei.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/ethtool.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c index abbe8fa66a5..f9e7179dedf 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -365,6 +365,20 @@ 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; @@ -1016,8 +1030,7 @@ 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); |