Merge tag 'mlx5-updates-2020-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
mlx5-updates-2020-08-03

This patchset introduces some updates to mlx5 driver.

1) Jakub converts mlx5 to use the new udp tunnel infrastructure.
   Starting with a hack to allow drivers to request a static configuration
   of the default vxlan port, and then a patch that converts mlx5.

2) Parav implements change_carrier ndo for VF eswitch representors,
   to speedup link state control of representors netdevices.

3) Alex Vesker, makes a simple update to software steering to fix an issue
   with push vlan action sequence

4) Leon removes a redundant dump stack on error flow.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/ethtool-netlink.rst

@@ -1263,6 +1263,9 @@ Kernel response contents:
  | | | | ``ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE``   | u32    | tunnel type         |
  +-+-+-+---------------------------------------+--------+---------------------+
 
+For UDP tunnel table empty ``ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES`` indicates that
+the table contains static entries, hard-coded by the NIC.
+
 Request translation
 ===================
 

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -45,6 +45,7 @@
 #include <linux/mlx5/transobj.h>
 #include <linux/mlx5/fs.h>
 #include <linux/rhashtable.h>
+#include <net/udp_tunnel.h>
 #include <net/switchdev.h>
 #include <net/xdp.h>
 #include <linux/dim.h>
@@ -792,6 +793,7 @@ struct mlx5e_priv {
 	u16                        drop_rq_q_counter;
 	struct notifier_block      events_nb;
 
+	struct udp_tunnel_nic_info nic_info;
 #ifdef CONFIG_MLX5_CORE_EN_DCB
 	struct mlx5e_dcbx          dcbx;
 #endif
@@ -1012,6 +1014,7 @@ int mlx5e_set_dev_port_mtu(struct mlx5e_priv *priv);
 int mlx5e_set_dev_port_mtu_ctx(struct mlx5e_priv *priv, void *context);
 int mlx5e_change_mtu(struct net_device *netdev, int new_mtu,
 		     mlx5e_fp_preactivate preactivate);
+void mlx5e_vxlan_set_netdev_info(struct mlx5e_priv *priv);
 
 /* ethtool helpers */
 void mlx5e_ethtool_get_drvinfo(struct mlx5e_priv *priv,
@@ -1080,8 +1083,6 @@ void mlx5e_build_rss_params(struct mlx5e_rss_params *rss_params,
 void mlx5e_rx_dim_work(struct work_struct *work);
 void mlx5e_tx_dim_work(struct work_struct *work);
 
-void mlx5e_add_vxlan_port(struct net_device *netdev, struct udp_tunnel_info *ti);
-void mlx5e_del_vxlan_port(struct net_device *netdev, struct udp_tunnel_info *ti);
 netdev_features_t mlx5e_features_check(struct sk_buff *skb,
 				       struct net_device *netdev,
 				       netdev_features_t features);

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -4191,83 +4191,6 @@ int mlx5e_get_vf_stats(struct net_device *dev,
 }
 #endif
 
-struct mlx5e_vxlan_work {
-	struct work_struct	work;
-	struct mlx5e_priv	*priv;
-	u16			port;
-};
-
-static void mlx5e_vxlan_add_work(struct work_struct *work)
-{
-	struct mlx5e_vxlan_work *vxlan_work =
-		container_of(work, struct mlx5e_vxlan_work, work);
-	struct mlx5e_priv *priv = vxlan_work->priv;
-	u16 port = vxlan_work->port;
-
-	mutex_lock(&priv->state_lock);
-	mlx5_vxlan_add_port(priv->mdev->vxlan, port);
-	mutex_unlock(&priv->state_lock);
-
-	kfree(vxlan_work);
-}
-
-static void mlx5e_vxlan_del_work(struct work_struct *work)
-{
-	struct mlx5e_vxlan_work *vxlan_work =
-		container_of(work, struct mlx5e_vxlan_work, work);
-	struct mlx5e_priv *priv         = vxlan_work->priv;
-	u16 port = vxlan_work->port;
-
-	mutex_lock(&priv->state_lock);
-	mlx5_vxlan_del_port(priv->mdev->vxlan, port);
-	mutex_unlock(&priv->state_lock);
-	kfree(vxlan_work);
-}
-
-static void mlx5e_vxlan_queue_work(struct mlx5e_priv *priv, u16 port, int add)
-{
-	struct mlx5e_vxlan_work *vxlan_work;
-
-	vxlan_work = kmalloc(sizeof(*vxlan_work), GFP_ATOMIC);
-	if (!vxlan_work)
-		return;
-
-	if (add)
-		INIT_WORK(&vxlan_work->work, mlx5e_vxlan_add_work);
-	else
-		INIT_WORK(&vxlan_work->work, mlx5e_vxlan_del_work);
-
-	vxlan_work->priv = priv;
-	vxlan_work->port = port;
-	queue_work(priv->wq, &vxlan_work->work);
-}
-
-void mlx5e_add_vxlan_port(struct net_device *netdev, struct udp_tunnel_info *ti)
-{
-	struct mlx5e_priv *priv = netdev_priv(netdev);
-
-	if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
-		return;
-
-	if (!mlx5_vxlan_allowed(priv->mdev->vxlan))
-		return;
-
-	mlx5e_vxlan_queue_work(priv, be16_to_cpu(ti->port), 1);
-}
-
-void mlx5e_del_vxlan_port(struct net_device *netdev, struct udp_tunnel_info *ti)
-{
-	struct mlx5e_priv *priv = netdev_priv(netdev);
-
-	if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
-		return;
-
-	if (!mlx5_vxlan_allowed(priv->mdev->vxlan))
-		return;
-
-	mlx5e_vxlan_queue_work(priv, be16_to_cpu(ti->port), 0);
-}
-
 static netdev_features_t mlx5e_tunnel_features_check(struct mlx5e_priv *priv,
 						     struct sk_buff *skb,
 						     netdev_features_t features)
@@ -4597,8 +4520,8 @@ const struct net_device_ops mlx5e_netdev_ops = {
 	.ndo_change_mtu          = mlx5e_change_nic_mtu,
 	.ndo_do_ioctl            = mlx5e_ioctl,
 	.ndo_set_tx_maxrate      = mlx5e_set_tx_maxrate,
-	.ndo_udp_tunnel_add      = mlx5e_add_vxlan_port,
-	.ndo_udp_tunnel_del      = mlx5e_del_vxlan_port,
+	.ndo_udp_tunnel_add      = udp_tunnel_nic_add_port,
+	.ndo_udp_tunnel_del      = udp_tunnel_nic_del_port,
 	.ndo_features_check      = mlx5e_features_check,
 	.ndo_tx_timeout          = mlx5e_tx_timeout,
 	.ndo_bpf		 = mlx5e_xdp,
@@ -4869,6 +4792,39 @@ static void mlx5e_set_netdev_dev_addr(struct net_device *netdev)
 	}
 }
 
+static int mlx5e_vxlan_set_port(struct net_device *netdev, unsigned int table,
+				unsigned int entry, struct udp_tunnel_info *ti)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+
+	return mlx5_vxlan_add_port(priv->mdev->vxlan, ntohs(ti->port));
+}
+
+static int mlx5e_vxlan_unset_port(struct net_device *netdev, unsigned int table,
+				  unsigned int entry, struct udp_tunnel_info *ti)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+
+	return mlx5_vxlan_del_port(priv->mdev->vxlan, ntohs(ti->port));
+}
+
+void mlx5e_vxlan_set_netdev_info(struct mlx5e_priv *priv)
+{
+	if (!mlx5_vxlan_allowed(priv->mdev->vxlan))
+		return;
+
+	priv->nic_info.set_port = mlx5e_vxlan_set_port;
+	priv->nic_info.unset_port = mlx5e_vxlan_unset_port;
+	priv->nic_info.flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP |
+				UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN;
+	priv->nic_info.tables[0].tunnel_types = UDP_TUNNEL_TYPE_VXLAN;
+	/* Don't count the space hard-coded to the IANA port */
+	priv->nic_info.tables[0].n_entries =
+		mlx5_vxlan_max_udp_ports(priv->mdev) - 1;
+
+	priv->netdev->udp_tunnel_nic_info = &priv->nic_info;
+}
+
 static void mlx5e_build_nic_netdev(struct net_device *netdev)
 {
 	struct mlx5e_priv *priv = netdev_priv(netdev);
@@ -4912,6 +4868,8 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 	netdev->hw_features      |= NETIF_F_HW_VLAN_CTAG_FILTER;
 	netdev->hw_features      |= NETIF_F_HW_VLAN_STAG_TX;
 
+	mlx5e_vxlan_set_netdev_info(priv);
+
 	if (mlx5_vxlan_allowed(mdev->vxlan) || mlx5_geneve_tx_allowed(mdev) ||
 	    mlx5e_any_tunnel_proto_supported(mdev)) {
 		netdev->hw_enc_features |= NETIF_F_HW_CSUM;
@@ -5217,8 +5175,7 @@ static void mlx5e_nic_enable(struct mlx5e_priv *priv)
 	rtnl_lock();
 	if (netif_running(netdev))
 		mlx5e_open(netdev);
-	if (mlx5_vxlan_allowed(priv->mdev->vxlan))
-		udp_tunnel_get_rx_info(netdev);
+	udp_tunnel_nic_reset_ntf(priv->netdev);
 	netif_device_attach(netdev);
 	rtnl_unlock();
 }
@@ -5233,8 +5190,6 @@ static void mlx5e_nic_disable(struct mlx5e_priv *priv)
 	rtnl_lock();
 	if (netif_running(priv->netdev))
 		mlx5e_close(priv->netdev);
-	if (mlx5_vxlan_allowed(priv->mdev->vxlan))
-		udp_tunnel_drop_rx_info(priv->netdev);
 	netif_device_detach(priv->netdev);
 	rtnl_unlock();
 

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -611,6 +611,29 @@ static struct devlink_port *mlx5e_rep_get_devlink_port(struct net_device *dev)
 	return &rpriv->dl_port;
 }
 
+static int mlx5e_rep_change_carrier(struct net_device *dev, bool new_carrier)
+{
+	struct mlx5e_priv *priv = netdev_priv(dev);
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+	struct mlx5_eswitch_rep *rep = rpriv->rep;
+	int err;
+
+	if (new_carrier) {
+		err = mlx5_modify_vport_admin_state(priv->mdev, MLX5_VPORT_STATE_OP_MOD_ESW_VPORT,
+						    rep->vport, 1, MLX5_VPORT_ADMIN_STATE_UP);
+		if (err)
+			return err;
+		netif_carrier_on(dev);
+	} else {
+		err = mlx5_modify_vport_admin_state(priv->mdev, MLX5_VPORT_STATE_OP_MOD_ESW_VPORT,
+						    rep->vport, 1, MLX5_VPORT_ADMIN_STATE_DOWN);
+		if (err)
+			return err;
+		netif_carrier_off(dev);
+	}
+	return 0;
+}
+
 static const struct net_device_ops mlx5e_netdev_ops_rep = {
 	.ndo_open                = mlx5e_rep_open,
 	.ndo_stop                = mlx5e_rep_close,
@@ -621,6 +644,7 @@ static const struct net_device_ops mlx5e_netdev_ops_rep = {
 	.ndo_has_offload_stats	 = mlx5e_rep_has_offload_stats,
 	.ndo_get_offload_stats	 = mlx5e_rep_get_offload_stats,
 	.ndo_change_mtu          = mlx5e_rep_change_mtu,
+	.ndo_change_carrier      = mlx5e_rep_change_carrier,
 };
 
 static const struct net_device_ops mlx5e_netdev_ops_uplink_rep = {
@@ -634,8 +658,8 @@ static const struct net_device_ops mlx5e_netdev_ops_uplink_rep = {
 	.ndo_has_offload_stats	 = mlx5e_rep_has_offload_stats,
 	.ndo_get_offload_stats	 = mlx5e_rep_get_offload_stats,
 	.ndo_change_mtu          = mlx5e_uplink_rep_change_mtu,
-	.ndo_udp_tunnel_add      = mlx5e_add_vxlan_port,
-	.ndo_udp_tunnel_del      = mlx5e_del_vxlan_port,
+	.ndo_udp_tunnel_add      = udp_tunnel_nic_add_port,
+	.ndo_udp_tunnel_del      = udp_tunnel_nic_del_port,
 	.ndo_features_check      = mlx5e_features_check,
 	.ndo_set_vf_mac          = mlx5e_set_vf_mac,
 	.ndo_set_vf_rate         = mlx5e_set_vf_rate,
@@ -706,6 +730,7 @@ static void mlx5e_build_rep_netdev(struct net_device *netdev)
 		/* we want a persistent mac for the uplink rep */
 		mlx5_query_mac_address(mdev, netdev->dev_addr);
 		netdev->ethtool_ops = &mlx5e_uplink_rep_ethtool_ops;
+		mlx5e_vxlan_set_netdev_info(priv);
 		mlx5e_dcbnl_build_rep_netdev(netdev);
 	} else {
 		netdev->netdev_ops = &mlx5e_netdev_ops_rep;

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -846,18 +846,15 @@ static int connect_fts_in_prio(struct mlx5_core_dev *dev,
 {
 	struct mlx5_flow_root_namespace *root = find_root(&prio->node);
 	struct mlx5_flow_table *iter;
-	int i = 0;
 	int err;
 
 	fs_for_each_ft(iter, prio) {
-		i++;
 		err = root->cmds->modify_flow_table(root, iter, ft);
 		if (err) {
-			mlx5_core_warn(dev, "Failed to modify flow table %d\n",
-				       iter->id);
+			mlx5_core_err(dev,
+				      "Failed to modify flow table id %d, type %d, err %d\n",
+				      iter->id, iter->type, err);
 			/* The driver is out of sync with the FW */
-			if (i > 1)
-				WARN_ON(true);
 			return err;
 		}
 	}

drivers/net/ethernet/mellanox/mlx5/core/lib/vxlan.c

@@ -42,21 +42,14 @@ struct mlx5_vxlan {
 	struct mlx5_core_dev		*mdev;
 	/* max_num_ports is usuallly 4, 16 buckets is more than enough */
 	DECLARE_HASHTABLE(htable, 4);
-	int				num_ports;
 	struct mutex                    sync_lock; /* sync add/del port HW operations */
 };
 
 struct mlx5_vxlan_port {
 	struct hlist_node hlist;
-	refcount_t refcount;
 	u16 udp_port;
 };
 
-static inline u8 mlx5_vxlan_max_udp_ports(struct mlx5_core_dev *mdev)
-{
-	return MLX5_CAP_ETH(mdev, max_vxlan_udp_ports) ?: 4;
-}
-
 static int mlx5_vxlan_core_add_port_cmd(struct mlx5_core_dev *mdev, u16 port)
 {
 	u32 in[MLX5_ST_SZ_DW(add_vxlan_udp_dport_in)] = {};
@@ -109,48 +102,24 @@ static struct mlx5_vxlan_port *vxlan_lookup_port(struct mlx5_vxlan *vxlan, u16 p
 int mlx5_vxlan_add_port(struct mlx5_vxlan *vxlan, u16 port)
 {
 	struct mlx5_vxlan_port *vxlanp;
-	int ret = 0;
-
-	mutex_lock(&vxlan->sync_lock);
-	vxlanp = vxlan_lookup_port(vxlan, port);
-	if (vxlanp) {
-		refcount_inc(&vxlanp->refcount);
-		goto unlock;
-	}
+	int ret;
 
-	if (vxlan->num_ports >= mlx5_vxlan_max_udp_ports(vxlan->mdev)) {
-		mlx5_core_info(vxlan->mdev,
-			       "UDP port (%d) not offloaded, max number of UDP ports (%d) are already offloaded\n",
-			       port, mlx5_vxlan_max_udp_ports(vxlan->mdev));
-		ret = -ENOSPC;
-		goto unlock;
-	}
+	vxlanp = kzalloc(sizeof(*vxlanp), GFP_KERNEL);
+	if (!vxlanp)
+		return -ENOMEM;
+	vxlanp->udp_port = port;
 
 	ret = mlx5_vxlan_core_add_port_cmd(vxlan->mdev, port);
-	if (ret)
-		goto unlock;
-
-	vxlanp = kzalloc(sizeof(*vxlanp), GFP_KERNEL);
-	if (!vxlanp) {
-		ret = -ENOMEM;
-		goto err_delete_port;
+	if (ret) {
+		kfree(vxlanp);
+		return ret;
 	}
 
-	vxlanp->udp_port = port;
-	refcount_set(&vxlanp->refcount, 1);
-
+	mutex_lock(&vxlan->sync_lock);
 	hash_add_rcu(vxlan->htable, &vxlanp->hlist, port);
-
-	vxlan->num_ports++;
 	mutex_unlock(&vxlan->sync_lock);
-	return 0;
-
-err_delete_port:
-	mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
 
-unlock:
-	mutex_unlock(&vxlan->sync_lock);
-	return ret;
+	return 0;
 }
 
 int mlx5_vxlan_del_port(struct mlx5_vxlan *vxlan, u16 port)
@@ -161,18 +130,15 @@ int mlx5_vxlan_del_port(struct mlx5_vxlan *vxlan, u16 port)
 	mutex_lock(&vxlan->sync_lock);
 
 	vxlanp = vxlan_lookup_port(vxlan, port);
-	if (!vxlanp) {
+	if (WARN_ON(!vxlanp)) {
 		ret = -ENOENT;
 		goto out_unlock;
 	}
 
-	if (refcount_dec_and_test(&vxlanp->refcount)) {
-		hash_del_rcu(&vxlanp->hlist);
-		synchronize_rcu();
-		mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
-		kfree(vxlanp);
-		vxlan->num_ports--;
-	}
+	hash_del_rcu(&vxlanp->hlist);
+	synchronize_rcu();
+	mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
+	kfree(vxlanp);
 
 out_unlock:
 	mutex_unlock(&vxlan->sync_lock);

drivers/net/ethernet/mellanox/mlx5/core/lib/vxlan.h

@@ -37,6 +37,11 @@
 struct mlx5_vxlan;
 struct mlx5_vxlan_port;
 
+static inline u8 mlx5_vxlan_max_udp_ports(struct mlx5_core_dev *mdev)
+{
+	return MLX5_CAP_ETH(mdev, max_vxlan_udp_ports) ?: 4;
+}
+
 static inline bool mlx5_vxlan_allowed(struct mlx5_vxlan *vxlan)
 {
 	/* not allowed reason is encoded in vxlan pointer as error,

drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c

@@ -279,29 +279,9 @@ static int mlx5_cmd_dr_create_fte(struct mlx5_flow_root_namespace *ns,
 
 	/* The order of the actions are must to be keep, only the following
 	 * order is supported by SW steering:
-	 * TX: push vlan -> modify header -> encap
+	 * TX: modify header -> push vlan -> encap
 	 * RX: decap -> pop vlan -> modify header
 	 */
-	if (fte->action.action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) {
-		tmp_action = create_action_push_vlan(domain, &fte->action.vlan[0]);
-		if (!tmp_action) {
-			err = -ENOMEM;
-			goto free_actions;
-		}
-		fs_dr_actions[fs_dr_num_actions++] = tmp_action;
-		actions[num_actions++] = tmp_action;
-	}
-
-	if (fte->action.action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2) {
-		tmp_action = create_action_push_vlan(domain, &fte->action.vlan[1]);
-		if (!tmp_action) {
-			err = -ENOMEM;
-			goto free_actions;
-		}
-		fs_dr_actions[fs_dr_num_actions++] = tmp_action;
-		actions[num_actions++] = tmp_action;
-	}
-
 	if (fte->action.action & MLX5_FLOW_CONTEXT_ACTION_DECAP) {
 		enum mlx5dr_action_reformat_type decap_type =
 			DR_ACTION_REFORMAT_TYP_TNL_L2_TO_L2;
@@ -354,6 +334,26 @@ static int mlx5_cmd_dr_create_fte(struct mlx5_flow_root_namespace *ns,
 		actions[num_actions++] =
 			fte->action.modify_hdr->action.dr_action;
 
+	if (fte->action.action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) {
+		tmp_action = create_action_push_vlan(domain, &fte->action.vlan[0]);
+		if (!tmp_action) {
+			err = -ENOMEM;
+			goto free_actions;
+		}
+		fs_dr_actions[fs_dr_num_actions++] = tmp_action;
+		actions[num_actions++] = tmp_action;
+	}
+
+	if (fte->action.action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2) {
+		tmp_action = create_action_push_vlan(domain, &fte->action.vlan[1]);
+		if (!tmp_action) {
+			err = -ENOMEM;
+			goto free_actions;
+		}
+		fs_dr_actions[fs_dr_num_actions++] = tmp_action;
+		actions[num_actions++] = tmp_action;
+	}
+
 	if (delay_encap_set)
 		actions[num_actions++] =
 			fte->action.pkt_reformat->action.dr_action;

include/net/udp_tunnel.h

@@ -193,6 +193,11 @@ enum udp_tunnel_nic_info_flags {
 	UDP_TUNNEL_NIC_INFO_OPEN_ONLY	= BIT(1),
 	/* Device supports only IPv4 tunnels */
 	UDP_TUNNEL_NIC_INFO_IPV4_ONLY	= BIT(2),
+	/* Device has hard-coded the IANA VXLAN port (4789) as VXLAN.
+	 * This port must not be counted towards n_entries of any table.
+	 * Driver will not receive any callback associated with port 4789.
+	 */
+	UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN	= BIT(3),
 };
 
 /**

net/ethtool/tunnels.c

@@ -2,6 +2,7 @@
 
 #include <linux/ethtool_netlink.h>
 #include <net/udp_tunnel.h>
+#include <net/vxlan.h>
 
 #include "bitset.h"
 #include "common.h"
@@ -18,6 +19,20 @@ static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
 static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
 	      ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));
 
+static ssize_t ethnl_udp_table_reply_size(unsigned int types, bool compact)
+{
+	ssize_t size;
+
+	size = ethnl_bitset32_size(&types, NULL, __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
+				   udp_tunnel_type_names, compact);
+	if (size < 0)
+		return size;
+
+	return size +
+		nla_total_size(0) + /* _UDP_TABLE */
+		nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
+}
+
 static ssize_t
 ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
 			     struct netlink_ext_ack *extack)
@@ -25,8 +40,8 @@ ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
 	const struct udp_tunnel_nic_info *info;
 	unsigned int i;
+	ssize_t ret;
 	size_t size;
-	int ret;
 
 	info = req_base->dev->udp_tunnel_nic_info;
 	if (!info) {
@@ -39,13 +54,10 @@ ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
 
 	for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
 		if (!info->tables[i].n_entries)
-			return size;
+			break;
 
-		size += nla_total_size(0); /* _UDP_TABLE */
-		size +=	nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
-		ret = ethnl_bitset32_size(&info->tables[i].tunnel_types, NULL,
-					  __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
-					  udp_tunnel_type_names, compact);
+		ret = ethnl_udp_table_reply_size(info->tables[i].tunnel_types,
+						 compact);
 		if (ret < 0)
 			return ret;
 		size += ret;
@@ -53,6 +65,17 @@ ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
 		size += udp_tunnel_nic_dump_size(req_base->dev, i);
 	}
 
+	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
+		ret = ethnl_udp_table_reply_size(0, compact);
+		if (ret < 0)
+			return ret;
+		size += ret;
+
+		size += nla_total_size(0) +		 /* _TABLE_ENTRY */
+			nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */
+			nla_total_size(sizeof(u32));	 /* _ENTRY_TYPE */
+	}
+
 	return size;
 }
 
@@ -62,7 +85,7 @@ ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
 {
 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
 	const struct udp_tunnel_nic_info *info;
-	struct nlattr *ports, *table;
+	struct nlattr *ports, *table, *entry;
 	unsigned int i;
 
 	info = req_base->dev->udp_tunnel_nic_info;
@@ -97,10 +120,40 @@ ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
 		nla_nest_end(skb, table);
 	}
 
+	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
+		u32 zero = 0;
+
+		table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
+		if (!table)
+			goto err_cancel_ports;
+
+		if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE, 1))
+			goto err_cancel_table;
+
+		if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
+				       &zero, NULL,
+				       __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
+				       udp_tunnel_type_names, compact))
+			goto err_cancel_table;
+
+		entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
+
+		if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
+				 htons(IANA_VXLAN_UDP_PORT)) ||
+		    nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
+				ilog2(UDP_TUNNEL_TYPE_VXLAN)))
+			goto err_cancel_entry;
+
+		nla_nest_end(skb, entry);
+		nla_nest_end(skb, table);
+	}
+
 	nla_nest_end(skb, ports);
 
 	return 0;
 
+err_cancel_entry:
+	nla_nest_cancel(skb, entry);
 err_cancel_table:
 	nla_nest_cancel(skb, table);
 err_cancel_ports:

net/ipv4/udp_tunnel_nic.c

@@ -7,6 +7,7 @@
 #include <linux/types.h>
 #include <linux/workqueue.h>
 #include <net/udp_tunnel.h>
+#include <net/vxlan.h>
 
 enum udp_tunnel_nic_table_entry_flags {
 	UDP_TUNNEL_NIC_ENTRY_ADD	= BIT(0),
@@ -504,6 +505,12 @@ __udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti)
 		return;
 	if (!netif_running(dev) && info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)
 		return;
+	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN &&
+	    ti->port == htons(IANA_VXLAN_UDP_PORT)) {
+		if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
+			netdev_warn(dev, "device assumes port 4789 will be used by vxlan tunnels\n");
+		return;
+	}
 
 	if (!udp_tunnel_nic_is_capable(dev, utn, ti))
 		return;