1 files changed, 34 insertions, 8 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ef09224496e8..85e14adf5207 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -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 {
@@ -1654,7 +1658,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 	else
 		*skb_xdp = 0;
 
-	preempt_disable();
+	local_bh_disable();
 	rcu_read_lock();
 	xdp_prog = rcu_dereference(tun->xdp_prog);
 	if (xdp_prog && !*skb_xdp) {
@@ -1679,7 +1683,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 			if (err)
 				goto err_redirect;
 			rcu_read_unlock();
-			preempt_enable();
+			local_bh_enable();
 			return NULL;
 		case XDP_TX:
 			get_page(alloc_frag->page);
@@ -1687,7 +1691,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 			if (tun_xdp_tx(tun->dev, &xdp))
 				goto err_redirect;
 			rcu_read_unlock();
-			preempt_enable();
+			local_bh_enable();
 			return NULL;
 		case XDP_PASS:
 			delta = orig_data - xdp.data;
@@ -1707,7 +1711,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 	skb = build_skb(buf, buflen);
 	if (!skb) {
 		rcu_read_unlock();
-		preempt_enable();
+		local_bh_enable();
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -1717,7 +1721,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 	alloc_frag->offset += buflen;
 
 	rcu_read_unlock();
-	preempt_enable();
+	local_bh_enable();
 
 	return skb;
 
@@ -1725,7 +1729,7 @@ err_redirect:
 	put_page(alloc_frag->page);
 err_xdp:
 	rcu_read_unlock();
-	preempt_enable();
+	local_bh_enable();
 	this_cpu_inc(tun->pcpu_stats->rx_dropped);
 	return NULL;
 }
@@ -1921,16 +1925,19 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 		struct bpf_prog *xdp_prog;
 		int ret;
 
+		local_bh_disable();
 		rcu_read_lock();
 		xdp_prog = rcu_dereference(tun->xdp_prog);
 		if (xdp_prog) {
 			ret = do_xdp_generic(xdp_prog, skb);
 			if (ret != XDP_PASS) {
 				rcu_read_unlock();
+				local_bh_enable();
 				return total_len;
 			}
 		}
 		rcu_read_unlock();
+		local_bh_enable();
 	}
 
 	/* Compute the costly rx hash only if needed for flow updates.
@@ -2282,6 +2289,7 @@ 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;
@@ -3313,8 +3321,8 @@ 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);
@@ -3323,6 +3331,23 @@ 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;
 }
 
@@ -3393,6 +3418,7 @@ 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)