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ethtool: provide link state with LINKSTATE_GET request

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Implement LINKSTATE_GET netlink request to get link state information.

At the moment, only link up flag as provided by ETHTOOL_GLINK ioctl command
is returned.

LINKSTATE_GET request can be used with NLM_F_DUMP (without device
identification) to request the information for all devices in current
network namespace providing the data.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek
2019-12-27 15:56:23 +01:00
committed by David S. Miller
parent 1b1b1847c8
commit 3d2b847fb9
9 changed files with 146 additions and 6 deletions
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8
net/ethtool/ioctl.c
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@ -1365,12 +1365,12 @@ static int ethtool_nway_reset(struct net_device *dev)
static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
{
struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
int link = __ethtool_get_link(dev);
if (!dev->ethtool_ops->get_link)
return -EOPNOTSUPP;
edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
if (link < 0)
return link;
edata.data = link;
if (copy_to_user(useraddr, &edata, sizeof(edata)))
return -EFAULT;
return 0;