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Allow ethtool to change tun link settings

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Let user space set whatever it would like to advertise for the
tun interface.  Preserve the existing defaults.

Signed-off-by: Chas Williams <3chas3@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chas Williams 2018-06-02 17:49:53 -04:00 committed by David S. Miller
parent 4cd328f839
commit 4e24f2dd51
1 changed files with 25 additions and 2 deletions
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27
drivers/net/tun.c
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@ -81,6 +81,9 @@
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
static void tun_default_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd);
/* Uncomment to enable debugging */
/* #define TUN_DEBUG 1 */
@ -242,6 +245,7 @@ struct tun_struct {
struct bpf_prog __rcu *xdp_prog;
struct tun_prog __rcu *steering_prog;
struct tun_prog __rcu *filter_prog;
struct ethtool_link_ksettings link_ksettings;
};
struct veth {
@ -2295,6 +2299,7 @@ static void tun_setup(struct net_device *dev)
tun->owner = INVALID_UID;
tun->group = INVALID_GID;
tun_default_link_ksettings(dev, &tun->link_ksettings);
dev->ethtool_ops = &tun_ethtool_ops;
dev->needs_free_netdev = true;
@ -3326,8 +3331,8 @@ static struct miscdevice tun_miscdev = {
/* ethtool interface */
static int tun_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
static void tun_default_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
ethtool_link_ksettings_zero_link_mode(cmd, supported);
ethtool_link_ksettings_zero_link_mode(cmd, advertising);
@ -3336,6 +3341,23 @@ static int tun_get_link_ksettings(struct net_device *dev,
cmd->base.port = PORT_TP;
cmd->base.phy_address = 0;
cmd->base.autoneg = AUTONEG_DISABLE;
}
static int tun_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
struct tun_struct *tun = netdev_priv(dev);
memcpy(cmd, &tun->link_ksettings, sizeof(*cmd));
return 0;
}
static int tun_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd)
{
struct tun_struct *tun = netdev_priv(dev);
memcpy(&tun->link_ksettings, cmd, sizeof(*cmd));
return 0;
}
@ -3406,6 +3428,7 @@ static const struct ethtool_ops tun_ethtool_ops = {
.get_coalesce = tun_get_coalesce,
.set_coalesce = tun_set_coalesce,
.get_link_ksettings = tun_get_link_ksettings,
.set_link_ksettings = tun_set_link_ksettings,
};
static int tun_queue_resize(struct tun_struct *tun)