Merge branch 'udp_tunnel-convert-Intel-drivers-with-shared-tables'

Jakub Kicinski says:

====================
udp_tunnel: convert Intel drivers with shared tables

This set converts Intel drivers which have the ability to spawn
multiple netdevs, but have only one UDP tunnel port table.

Appropriate support is added to the core infra in patch 1,
followed by netdevsim support and a selftest.

The table sharing works by core attaching the same table
structure to all devices sharing the table. This means the
reference count has to accommodate potentially large values.

Once core is ready i40e and ice are converted. These are
complex drivers, but we got a tested-by from Aaron, so we
should be good :)

Compared to v1 I've made sure the selftest is executable.

Other than that patches 8 and 9 are actually from the Mellanox
conversion series were kept out to avoid Mellanox vs Intel
conflicts.

Last patch is new, some docs to let users knows ethtool
can now display UDP tunnel info.
====================

Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/vxlan.rst

···
 3. Show forwarding table::
 
     # bridge fdb show dev vxlan0
+
+The following NIC features may indicate support for UDP tunnel-related
+offloads (most commonly VXLAN features, but support for a particular
+encapsulation protocol is NIC specific):
+
+ - `tx-udp_tnl-segmentation`
+ - `tx-udp_tnl-csum-segmentation`
+    ability to perform TCP segmentation offload of UDP encapsulated frames
+
+ - `rx-udp_tunnel-port-offload`
+    receive side parsing of UDP encapsulated frames which allows NICs to
+    perform protocol-aware offloads, like checksum validation offload of
+    inner frames (only needed by NICs without protocol-agnostic offloads)
+
+For devices supporting `rx-udp_tunnel-port-offload` the list of currently
+offloaded ports can be interrogated with `ethtool`::
+
+  $ ethtool --show-tunnels eth0
+  Tunnel information for eth0:
+    UDP port table 0:
+      Size: 4
+      Types: vxlan
+      No entries
+    UDP port table 1:
+      Size: 4
+      Types: geneve, vxlan-gpe
+      Entries (1):
+          port 1230, vxlan-gpe

drivers/net/ethernet/intel/i40e/i40e.h

···
 #include <net/pkt_cls.h>
 #include <net/tc_act/tc_gact.h>
 #include <net/tc_act/tc_mirred.h>
+#include <net/udp_tunnel.h>
 #include <net/xdp_sock.h>
 #include "i40e_type.h"
 #include "i40e_prototype.h"
···
 	__I40E_PORT_SUSPENDED,
 	__I40E_VF_DISABLE,
 	__I40E_MACVLAN_SYNC_PENDING,
-	__I40E_UDP_FILTER_SYNC_PENDING,
 	__I40E_TEMP_LINK_POLLING,
 	__I40E_CLIENT_SERVICE_REQUESTED,
 	__I40E_CLIENT_L2_CHANGE,
···
 	struct list_head l3_flex_pit_list;
 	struct list_head l4_flex_pit_list;
 
-	struct i40e_udp_port_config udp_ports[I40E_MAX_PF_UDP_OFFLOAD_PORTS];
-	u16 pending_udp_bitmap;
+	struct udp_tunnel_nic_shared udp_tunnel_shared;
+	struct udp_tunnel_nic_info udp_tunnel_nic;
 
 	struct hlist_head cloud_filter_list;
 	u16 num_cloud_filters;

drivers/net/ethernet/intel/i40e/i40e_main.c

···
 	i40e_flush(hw);
 }
 
-static const char *i40e_tunnel_name(u8 type)
-{
-	switch (type) {
-	case UDP_TUNNEL_TYPE_VXLAN:
-		return "vxlan";
-	case UDP_TUNNEL_TYPE_GENEVE:
-		return "geneve";
-	default:
-		return "unknown";
-	}
-}
-
-/**
- * i40e_sync_udp_filters - Trigger a sync event for existing UDP filters
- * @pf: board private structure
- **/
-static void i40e_sync_udp_filters(struct i40e_pf *pf)
-{
-	int i;
-
-	/* loop through and set pending bit for all active UDP filters */
-	for (i = 0; i < I40E_MAX_PF_UDP_OFFLOAD_PORTS; i++) {
-		if (pf->udp_ports[i].port)
-			pf->pending_udp_bitmap |= BIT_ULL(i);
-	}
-
-	set_bit(__I40E_UDP_FILTER_SYNC_PENDING, pf->state);
-}
-
-/**
- * i40e_sync_udp_filters_subtask - Sync the VSI filter list with HW
- * @pf: board private structure
- **/
-static void i40e_sync_udp_filters_subtask(struct i40e_pf *pf)
-{
-	struct i40e_hw *hw = &pf->hw;
-	u8 filter_index, type;
-	u16 port;
-	int i;
-
-	if (!test_and_clear_bit(__I40E_UDP_FILTER_SYNC_PENDING, pf->state))
-		return;
-
-	/* acquire RTNL to maintain state of flags and port requests */
-	rtnl_lock();
-
-	for (i = 0; i < I40E_MAX_PF_UDP_OFFLOAD_PORTS; i++) {
-		if (pf->pending_udp_bitmap & BIT_ULL(i)) {
-			struct i40e_udp_port_config *udp_port;
-			i40e_status ret = 0;
-
-			udp_port = &pf->udp_ports[i];
-			pf->pending_udp_bitmap &= ~BIT_ULL(i);
-
-			port = READ_ONCE(udp_port->port);
-			type = READ_ONCE(udp_port->type);
-			filter_index = READ_ONCE(udp_port->filter_index);
-
-			/* release RTNL while we wait on AQ command */
-			rtnl_unlock();
-
-			if (port)
-				ret = i40e_aq_add_udp_tunnel(hw, port,
-							     type,
-							     &filter_index,
-							     NULL);
-			else if (filter_index != I40E_UDP_PORT_INDEX_UNUSED)
-				ret = i40e_aq_del_udp_tunnel(hw, filter_index,
-							     NULL);
-
-			/* reacquire RTNL so we can update filter_index */
-			rtnl_lock();
-
-			if (ret) {
-				dev_info(&pf->pdev->dev,
-					 "%s %s port %d, index %d failed, err %s aq_err %s\n",
-					 i40e_tunnel_name(type),
-					 port ? "add" : "delete",
-					 port,
-					 filter_index,
-					 i40e_stat_str(&pf->hw, ret),
-					 i40e_aq_str(&pf->hw,
-						     pf->hw.aq.asq_last_status));
-				if (port) {
-					/* failed to add, just reset port,
-					 * drop pending bit for any deletion
-					 */
-					udp_port->port = 0;
-					pf->pending_udp_bitmap &= ~BIT_ULL(i);
-				}
-			} else if (port) {
-				/* record filter index on success */
-				udp_port->filter_index = filter_index;
-			}
-		}
-	}
-
-	rtnl_unlock();
-}
-
 /**
  * i40e_service_task - Run the driver's async subtasks
  * @work: pointer to work_struct containing our data
···
 								pf->vsi[pf->lan_vsi]);
 		}
 		i40e_sync_filters_subtask(pf);
-		i40e_sync_udp_filters_subtask(pf);
 	} else {
 		i40e_reset_subtask(pf);
 	}
···
 	return 0;
 }
 
-/**
- * i40e_get_udp_port_idx - Lookup a possibly offloaded for Rx UDP port
- * @pf: board private structure
- * @port: The UDP port to look up
- *
- * Returns the index number or I40E_MAX_PF_UDP_OFFLOAD_PORTS if port not found
- **/
-static u8 i40e_get_udp_port_idx(struct i40e_pf *pf, u16 port)
-{
-	u8 i;
-
-	for (i = 0; i < I40E_MAX_PF_UDP_OFFLOAD_PORTS; i++) {
-		/* Do not report ports with pending deletions as
-		 * being available.
-		 */
-		if (!port && (pf->pending_udp_bitmap & BIT_ULL(i)))
-			continue;
-		if (pf->udp_ports[i].port == port)
-			return i;
-	}
-
-	return i;
-}
-
-/**
- * i40e_udp_tunnel_add - Get notifications about UDP tunnel ports that come up
- * @netdev: This physical port's netdev
- * @ti: Tunnel endpoint information
- **/
-static void i40e_udp_tunnel_add(struct net_device *netdev,
-				struct udp_tunnel_info *ti)
+static int i40e_udp_tunnel_set_port(struct net_device *netdev,
+				    unsigned int table, unsigned int idx,
+				    struct udp_tunnel_info *ti)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
-	struct i40e_vsi *vsi = np->vsi;
-	struct i40e_pf *pf = vsi->back;
-	u16 port = ntohs(ti->port);
-	u8 next_idx;
-	u8 idx;
+	struct i40e_hw *hw = &np->vsi->back->hw;
+	u8 type, filter_index;
+	i40e_status ret;
 
-	idx = i40e_get_udp_port_idx(pf, port);
+	type = ti->type == UDP_TUNNEL_TYPE_VXLAN ? I40E_AQC_TUNNEL_TYPE_VXLAN :
+						   I40E_AQC_TUNNEL_TYPE_NGE;
 
-	/* Check if port already exists */
-	if (idx < I40E_MAX_PF_UDP_OFFLOAD_PORTS) {
-		netdev_info(netdev, "port %d already offloaded\n", port);
-		return;
+	ret = i40e_aq_add_udp_tunnel(hw, ntohs(ti->port), type, &filter_index,
+				     NULL);
+	if (ret) {
+		netdev_info(netdev, "add UDP port failed, err %s aq_err %s\n",
+			    i40e_stat_str(hw, ret),
+			    i40e_aq_str(hw, hw->aq.asq_last_status));
+		return -EIO;
 	}
 
-	/* Now check if there is space to add the new port */
-	next_idx = i40e_get_udp_port_idx(pf, 0);
-
-	if (next_idx == I40E_MAX_PF_UDP_OFFLOAD_PORTS) {
-		netdev_info(netdev, "maximum number of offloaded UDP ports reached, not adding port %d\n",
-			    port);
-		return;
-	}
-
-	switch (ti->type) {
-	case UDP_TUNNEL_TYPE_VXLAN:
-		pf->udp_ports[next_idx].type = I40E_AQC_TUNNEL_TYPE_VXLAN;
-		break;
-	case UDP_TUNNEL_TYPE_GENEVE:
-		if (!(pf->hw_features & I40E_HW_GENEVE_OFFLOAD_CAPABLE))
-			return;
-		pf->udp_ports[next_idx].type = I40E_AQC_TUNNEL_TYPE_NGE;
-		break;
-	default:
-		return;
-	}
-
-	/* New port: add it and mark its index in the bitmap */
-	pf->udp_ports[next_idx].port = port;
-	pf->udp_ports[next_idx].filter_index = I40E_UDP_PORT_INDEX_UNUSED;
-	pf->pending_udp_bitmap |= BIT_ULL(next_idx);
-	set_bit(__I40E_UDP_FILTER_SYNC_PENDING, pf->state);
+	udp_tunnel_nic_set_port_priv(netdev, table, idx, filter_index);
+	return 0;
 }
 
-/**
- * i40e_udp_tunnel_del - Get notifications about UDP tunnel ports that go away
- * @netdev: This physical port's netdev
- * @ti: Tunnel endpoint information
- **/
-static void i40e_udp_tunnel_del(struct net_device *netdev,
-				struct udp_tunnel_info *ti)
+static int i40e_udp_tunnel_unset_port(struct net_device *netdev,
+				      unsigned int table, unsigned int idx,
+				      struct udp_tunnel_info *ti)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
-	struct i40e_vsi *vsi = np->vsi;
-	struct i40e_pf *pf = vsi->back;
-	u16 port = ntohs(ti->port);
-	u8 idx;
+	struct i40e_hw *hw = &np->vsi->back->hw;
+	i40e_status ret;
 
-	idx = i40e_get_udp_port_idx(pf, port);
-
-	/* Check if port already exists */
-	if (idx >= I40E_MAX_PF_UDP_OFFLOAD_PORTS)
-		goto not_found;
-
-	switch (ti->type) {
-	case UDP_TUNNEL_TYPE_VXLAN:
-		if (pf->udp_ports[idx].type != I40E_AQC_TUNNEL_TYPE_VXLAN)
-			goto not_found;
-		break;
-	case UDP_TUNNEL_TYPE_GENEVE:
-		if (pf->udp_ports[idx].type != I40E_AQC_TUNNEL_TYPE_NGE)
-			goto not_found;
-		break;
-	default:
-		goto not_found;
+	ret = i40e_aq_del_udp_tunnel(hw, ti->hw_priv, NULL);
+	if (ret) {
+		netdev_info(netdev, "delete UDP port failed, err %s aq_err %s\n",
+			    i40e_stat_str(hw, ret),
+			    i40e_aq_str(hw, hw->aq.asq_last_status));
+		return -EIO;
 	}
 
-	/* if port exists, set it to 0 (mark for deletion)
-	 * and make it pending
-	 */
-	pf->udp_ports[idx].port = 0;
-
-	/* Toggle pending bit instead of setting it. This way if we are
-	 * deleting a port that has yet to be added we just clear the pending
-	 * bit and don't have to worry about it.
-	 */
-	pf->pending_udp_bitmap ^= BIT_ULL(idx);
-	set_bit(__I40E_UDP_FILTER_SYNC_PENDING, pf->state);
-
-	return;
-not_found:
-	netdev_warn(netdev, "UDP port %d was not found, not deleting\n",
-		    port);
+	return 0;
 }
 
 static int i40e_get_phys_port_id(struct net_device *netdev,
···
 	.ndo_set_vf_link_state	= i40e_ndo_set_vf_link_state,
 	.ndo_set_vf_spoofchk	= i40e_ndo_set_vf_spoofchk,
 	.ndo_set_vf_trust	= i40e_ndo_set_vf_trust,
-	.ndo_udp_tunnel_add	= i40e_udp_tunnel_add,
-	.ndo_udp_tunnel_del	= i40e_udp_tunnel_del,
+	.ndo_udp_tunnel_add	= udp_tunnel_nic_add_port,
+	.ndo_udp_tunnel_del	= udp_tunnel_nic_del_port,
 	.ndo_get_phys_port_id	= i40e_get_phys_port_id,
 	.ndo_fdb_add		= i40e_ndo_fdb_add,
 	.ndo_features_check	= i40e_features_check,
···
 
 	if (!(pf->hw_features & I40E_HW_OUTER_UDP_CSUM_CAPABLE))
 		netdev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;
+
+	netdev->udp_tunnel_nic_info = &pf->udp_tunnel_nic;
 
 	netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
 
···
 	i40e_ptp_init(pf);
 
 	/* repopulate tunnel port filters */
-	i40e_sync_udp_filters(pf);
+	udp_tunnel_nic_reset_ntf(pf->vsi[pf->lan_vsi]->netdev);
 
 	return ret;
 }
···
 	if (err)
 		goto err_switch_setup;
 
+	pf->udp_tunnel_nic.set_port = i40e_udp_tunnel_set_port;
+	pf->udp_tunnel_nic.unset_port = i40e_udp_tunnel_unset_port;
+	pf->udp_tunnel_nic.flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP;
+	pf->udp_tunnel_nic.shared = &pf->udp_tunnel_shared;
+	pf->udp_tunnel_nic.tables[0].n_entries = I40E_MAX_PF_UDP_OFFLOAD_PORTS;
+	pf->udp_tunnel_nic.tables[0].tunnel_types = UDP_TUNNEL_TYPE_VXLAN |
+						    UDP_TUNNEL_TYPE_GENEVE;
+
 	/* The number of VSIs reported by the FW is the minimum guaranteed
 	 * to us; HW supports far more and we share the remaining pool with
 	 * the other PFs. We allocate space for more than the guarantee with
···
 		pf->num_alloc_vsi = I40E_MIN_VSI_ALLOC;
 	else
 		pf->num_alloc_vsi = pf->hw.func_caps.num_vsis;
+	if (pf->num_alloc_vsi > UDP_TUNNEL_NIC_MAX_SHARING_DEVICES) {
+		dev_warn(&pf->pdev->dev,
+			 "limiting the VSI count due to UDP tunnel limitation %d > %d\n",
+			 pf->num_alloc_vsi, UDP_TUNNEL_NIC_MAX_SHARING_DEVICES);
+		pf->num_alloc_vsi = UDP_TUNNEL_NIC_MAX_SHARING_DEVICES;
+	}
 
 	/* Set up the *vsi struct and our local tracking of the MAIN PF vsi. */
 	pf->vsi = kcalloc(pf->num_alloc_vsi, sizeof(struct i40e_vsi *),

drivers/net/ethernet/intel/ice/ice_ethtool_fdir.c

···
 		bool is_tun = tun == ICE_FD_HW_SEG_TUN;
 		int err;
 
-		if (is_tun && !ice_get_open_tunnel_port(&pf->hw, TNL_ALL,
-							&port_num))
+		if (is_tun && !ice_get_open_tunnel_port(&pf->hw, &port_num))
 			continue;
 		err = ice_fdir_write_fltr(pf, input, add, is_tun);
 		if (err)
···
 	}
 
 	/* return error if not an update and no available filters */
-	fltrs_needed = ice_get_open_tunnel_port(hw, TNL_ALL, &tunnel_port) ?
-		2 : 1;
+	fltrs_needed = ice_get_open_tunnel_port(hw, &tunnel_port) ? 2 : 1;
 	if (!ice_fdir_find_fltr_by_idx(hw, fsp->location) &&
 	    ice_fdir_num_avail_fltr(hw, pf->vsi[vsi->idx]) < fltrs_needed) {
 		dev_err(dev, "Failed to add filter.  The maximum number of flow director filters has been reached.\n");

drivers/net/ethernet/intel/ice/ice_fdir.c

···
 		memcpy(pkt, ice_fdir_pkt[idx].pkt, ice_fdir_pkt[idx].pkt_len);
 		loc = pkt;
 	} else {
-		if (!ice_get_open_tunnel_port(hw, TNL_ALL, &tnl_port))
+		if (!ice_get_open_tunnel_port(hw, &tnl_port))
 			return ICE_ERR_DOES_NOT_EXIST;
 		if (!ice_fdir_pkt[idx].tun_pkt)
 			return ICE_ERR_PARAM;

drivers/net/ethernet/intel/ice/ice_flex_pipe.c

···
 			if ((label_name[len] - '0') == hw->pf_id) {
 				hw->tnl.tbl[hw->tnl.count].type = tnls[i].type;
 				hw->tnl.tbl[hw->tnl.count].valid = false;
-				hw->tnl.tbl[hw->tnl.count].in_use = false;
-				hw->tnl.tbl[hw->tnl.count].marked = false;
 				hw->tnl.tbl[hw->tnl.count].boost_addr = val;
 				hw->tnl.tbl[hw->tnl.count].port = 0;
 				hw->tnl.count++;
···
 	for (i = 0; i < hw->tnl.count; i++) {
 		ice_find_boost_entry(ice_seg, hw->tnl.tbl[i].boost_addr,
 				     &hw->tnl.tbl[i].boost_entry);
-		if (hw->tnl.tbl[i].boost_entry)
+		if (hw->tnl.tbl[i].boost_entry) {
 			hw->tnl.tbl[i].valid = true;
+			if (hw->tnl.tbl[i].type < __TNL_TYPE_CNT)
+				hw->tnl.valid_count[hw->tnl.tbl[i].type]++;
+		}
 	}
 }
 
···
 }
 
 /**
- * ice_tunnel_port_in_use_hlpr - helper function to determine tunnel usage
- * @hw: pointer to the HW structure
- * @port: port to search for
- * @index: optionally returns index
- *
- * Returns whether a port is already in use as a tunnel, and optionally its
- * index
- */
-static bool ice_tunnel_port_in_use_hlpr(struct ice_hw *hw, u16 port, u16 *index)
-{
-	u16 i;
-
-	for (i = 0; i < hw->tnl.count && i < ICE_TUNNEL_MAX_ENTRIES; i++)
-		if (hw->tnl.tbl[i].in_use && hw->tnl.tbl[i].port == port) {
-			if (index)
-				*index = i;
-			return true;
-		}
-
-	return false;
-}
-
-/**
- * ice_tunnel_port_in_use
- * @hw: pointer to the HW structure
- * @port: port to search for
- * @index: optionally returns index
- *
- * Returns whether a port is already in use as a tunnel, and optionally its
- * index
- */
-bool ice_tunnel_port_in_use(struct ice_hw *hw, u16 port, u16 *index)
-{
-	bool res;
-
-	mutex_lock(&hw->tnl_lock);
-	res = ice_tunnel_port_in_use_hlpr(hw, port, index);
-	mutex_unlock(&hw->tnl_lock);
-
-	return res;
-}
-
-/**
- * ice_find_free_tunnel_entry
- * @hw: pointer to the HW structure
- * @type: tunnel type
- * @index: optionally returns index
- *
- * Returns whether there is a free tunnel entry, and optionally its index
- */
-static bool
-ice_find_free_tunnel_entry(struct ice_hw *hw, enum ice_tunnel_type type,
-			   u16 *index)
-{
-	u16 i;
-
-	for (i = 0; i < hw->tnl.count && i < ICE_TUNNEL_MAX_ENTRIES; i++)
-		if (hw->tnl.tbl[i].valid && !hw->tnl.tbl[i].in_use &&
-		    hw->tnl.tbl[i].type == type) {
-			if (index)
-				*index = i;
-			return true;
-		}
-
-	return false;
-}
-
-/**
  * ice_get_open_tunnel_port - retrieve an open tunnel port
  * @hw: pointer to the HW structure
- * @type: tunnel type (TNL_ALL will return any open port)
  * @port: returns open port
  */
 bool
-ice_get_open_tunnel_port(struct ice_hw *hw, enum ice_tunnel_type type,
-			 u16 *port)
+ice_get_open_tunnel_port(struct ice_hw *hw, u16 *port)
 {
 	bool res = false;
 	u16 i;
···
 	mutex_lock(&hw->tnl_lock);
 
 	for (i = 0; i < hw->tnl.count && i < ICE_TUNNEL_MAX_ENTRIES; i++)
-		if (hw->tnl.tbl[i].valid && hw->tnl.tbl[i].in_use &&
-		    (type == TNL_ALL || hw->tnl.tbl[i].type == type)) {
+		if (hw->tnl.tbl[i].valid && hw->tnl.tbl[i].port) {
 			*port = hw->tnl.tbl[i].port;
 			res = true;
 			break;
···
 }
 
 /**
+ * ice_tunnel_idx_to_entry - convert linear index to the sparse one
+ * @hw: pointer to the HW structure
+ * @type: type of tunnel
+ * @idx: linear index
+ *
+ * Stack assumes we have 2 linear tables with indexes [0, count_valid),
+ * but really the port table may be sprase, and types are mixed, so convert
+ * the stack index into the device index.
+ */
+static u16 ice_tunnel_idx_to_entry(struct ice_hw *hw, enum ice_tunnel_type type,
+				   u16 idx)
+{
+	u16 i;
+
+	for (i = 0; i < hw->tnl.count && i < ICE_TUNNEL_MAX_ENTRIES; i++)
+		if (hw->tnl.tbl[i].valid &&
+		    hw->tnl.tbl[i].type == type &&
+		    idx--)
+			return i;
+
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
+/**
  * ice_create_tunnel
  * @hw: pointer to the HW structure
+ * @index: device table entry
  * @type: type of tunnel
  * @port: port of tunnel to create
  *
···
  * creating a package buffer with the tunnel info and issuing an update package
  * command.
  */
-enum ice_status
-ice_create_tunnel(struct ice_hw *hw, enum ice_tunnel_type type, u16 port)
+static enum ice_status
+ice_create_tunnel(struct ice_hw *hw, u16 index,
+		  enum ice_tunnel_type type, u16 port)
 {
 	struct ice_boost_tcam_section *sect_rx, *sect_tx;
 	enum ice_status status = ICE_ERR_MAX_LIMIT;
 	struct ice_buf_build *bld;
-	u16 index;
 
 	mutex_lock(&hw->tnl_lock);
-
-	if (ice_tunnel_port_in_use_hlpr(hw, port, &index)) {
-		hw->tnl.tbl[index].ref++;
-		status = 0;
-		goto ice_create_tunnel_end;
-	}
-
-	if (!ice_find_free_tunnel_entry(hw, type, &index)) {
-		status = ICE_ERR_OUT_OF_RANGE;
-		goto ice_create_tunnel_end;
-	}
 
 	bld = ice_pkg_buf_alloc(hw);
 	if (!bld) {
···
 	memcpy(sect_tx->tcam, sect_rx->tcam, sizeof(*sect_tx->tcam));
 
 	status = ice_update_pkg(hw, ice_pkg_buf(bld), 1);
-	if (!status) {
+	if (!status)
 		hw->tnl.tbl[index].port = port;
-		hw->tnl.tbl[index].in_use = true;
-		hw->tnl.tbl[index].ref = 1;
-	}
 
 ice_create_tunnel_err:
 	ice_pkg_buf_free(hw, bld);
···
 /**
  * ice_destroy_tunnel
  * @hw: pointer to the HW structure
+ * @index: device table entry
+ * @type: type of tunnel
  * @port: port of tunnel to destroy (ignored if the all parameter is true)
- * @all: flag that states to destroy all tunnels
  *
  * Destroys a tunnel or all tunnels by creating an update package buffer
  * targeting the specific updates requested and then performing an update
  * package.
  */
-enum ice_status ice_destroy_tunnel(struct ice_hw *hw, u16 port, bool all)
+static enum ice_status
+ice_destroy_tunnel(struct ice_hw *hw, u16 index, enum ice_tunnel_type type,
+		   u16 port)
 {
 	struct ice_boost_tcam_section *sect_rx, *sect_tx;
 	enum ice_status status = ICE_ERR_MAX_LIMIT;
 	struct ice_buf_build *bld;
-	u16 count = 0;
-	u16 index;
-	u16 size;
-	u16 i;
 
 	mutex_lock(&hw->tnl_lock);
 
-	if (!all && ice_tunnel_port_in_use_hlpr(hw, port, &index))
-		if (hw->tnl.tbl[index].ref > 1) {
-			hw->tnl.tbl[index].ref--;
-			status = 0;
-			goto ice_destroy_tunnel_end;
-		}
-
-	/* determine count */
-	for (i = 0; i < hw->tnl.count && i < ICE_TUNNEL_MAX_ENTRIES; i++)
-		if (hw->tnl.tbl[i].valid && hw->tnl.tbl[i].in_use &&
-		    (all || hw->tnl.tbl[i].port == port))
-			count++;
-
-	if (!count) {
-		status = ICE_ERR_PARAM;
+	if (WARN_ON(!hw->tnl.tbl[index].valid ||
+		    hw->tnl.tbl[index].type != type ||
+		    hw->tnl.tbl[index].port != port)) {
+		status = ICE_ERR_OUT_OF_RANGE;
 		goto ice_destroy_tunnel_end;
 	}
-
-	/* size of section - there is at least one entry */
-	size = struct_size(sect_rx, tcam, count);
 
 	bld = ice_pkg_buf_alloc(hw);
 	if (!bld) {
···
 		goto ice_destroy_tunnel_err;
 
 	sect_rx = ice_pkg_buf_alloc_section(bld, ICE_SID_RXPARSER_BOOST_TCAM,
-					    size);
+					    struct_size(sect_rx, tcam, 1));
 	if (!sect_rx)
 		goto ice_destroy_tunnel_err;
 	sect_rx->count = cpu_to_le16(1);
 
 	sect_tx = ice_pkg_buf_alloc_section(bld, ICE_SID_TXPARSER_BOOST_TCAM,
-					    size);
+					    struct_size(sect_tx, tcam, 1));
 	if (!sect_tx)
 		goto ice_destroy_tunnel_err;
 	sect_tx->count = cpu_to_le16(1);
···
 	/* copy original boost entry to update package buffer, one copy to Rx
 	 * section, another copy to the Tx section
 	 */
-	for (i = 0; i < hw->tnl.count && i < ICE_TUNNEL_MAX_ENTRIES; i++)
-		if (hw->tnl.tbl[i].valid && hw->tnl.tbl[i].in_use &&
-		    (all || hw->tnl.tbl[i].port == port)) {
-			memcpy(sect_rx->tcam + i, hw->tnl.tbl[i].boost_entry,
-			       sizeof(*sect_rx->tcam));
-			memcpy(sect_tx->tcam + i, hw->tnl.tbl[i].boost_entry,
-			       sizeof(*sect_tx->tcam));
-			hw->tnl.tbl[i].marked = true;
-		}
+	memcpy(sect_rx->tcam, hw->tnl.tbl[index].boost_entry,
+	       sizeof(*sect_rx->tcam));
+	memcpy(sect_tx->tcam, hw->tnl.tbl[index].boost_entry,
+	       sizeof(*sect_tx->tcam));
 
 	status = ice_update_pkg(hw, ice_pkg_buf(bld), 1);
 	if (!status)
-		for (i = 0; i < hw->tnl.count &&
-		     i < ICE_TUNNEL_MAX_ENTRIES; i++)
-			if (hw->tnl.tbl[i].marked) {
-				hw->tnl.tbl[i].ref = 0;
-				hw->tnl.tbl[i].port = 0;
-				hw->tnl.tbl[i].in_use = false;
-				hw->tnl.tbl[i].marked = false;
-			}
+		hw->tnl.tbl[index].port = 0;
 
 ice_destroy_tunnel_err:
 	ice_pkg_buf_free(hw, bld);
···
 	mutex_unlock(&hw->tnl_lock);
 
 	return status;
+}
+
+int ice_udp_tunnel_set_port(struct net_device *netdev, unsigned int table,
+			    unsigned int idx, struct udp_tunnel_info *ti)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+	enum ice_tunnel_type tnl_type;
+	enum ice_status status;
+	u16 index;
+
+	tnl_type = ti->type == UDP_TUNNEL_TYPE_VXLAN ? TNL_VXLAN : TNL_GENEVE;
+	index = ice_tunnel_idx_to_entry(&pf->hw, idx, tnl_type);
+
+	status = ice_create_tunnel(&pf->hw, index, tnl_type, ntohs(ti->port));
+	if (status) {
+		netdev_err(netdev, "Error adding UDP tunnel - %s\n",
+			   ice_stat_str(status));
+		return -EIO;
+	}
+
+	udp_tunnel_nic_set_port_priv(netdev, table, idx, index);
+	return 0;
+}
+
+int ice_udp_tunnel_unset_port(struct net_device *netdev, unsigned int table,
+			      unsigned int idx, struct udp_tunnel_info *ti)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+	enum ice_tunnel_type tnl_type;
+	enum ice_status status;
+
+	tnl_type = ti->type == UDP_TUNNEL_TYPE_VXLAN ? TNL_VXLAN : TNL_GENEVE;
+
+	status = ice_destroy_tunnel(&pf->hw, ti->hw_priv, tnl_type,
+				    ntohs(ti->port));
+	if (status) {
+		netdev_err(netdev, "Error removing UDP tunnel - %s\n",
+			   ice_stat_str(status));
+		return -EIO;
+	}
+
+	return 0;
 }
 
 /* PTG Management */

drivers/net/ethernet/intel/ice/ice_flex_pipe.h

···
 #define ICE_PKG_CNT 4
 
 bool
-ice_get_open_tunnel_port(struct ice_hw *hw, enum ice_tunnel_type type,
-			 u16 *port);
-enum ice_status
-ice_create_tunnel(struct ice_hw *hw, enum ice_tunnel_type type, u16 port);
-enum ice_status ice_destroy_tunnel(struct ice_hw *hw, u16 port, bool all);
-bool ice_tunnel_port_in_use(struct ice_hw *hw, u16 port, u16 *index);
+ice_get_open_tunnel_port(struct ice_hw *hw, u16 *port);
+int ice_udp_tunnel_set_port(struct net_device *netdev, unsigned int table,
+			    unsigned int idx, struct udp_tunnel_info *ti);
+int ice_udp_tunnel_unset_port(struct net_device *netdev, unsigned int table,
+			      unsigned int idx, struct udp_tunnel_info *ti);
 
 enum ice_status
 ice_add_prof(struct ice_hw *hw, enum ice_block blk, u64 id, u8 ptypes[],

drivers/net/ethernet/intel/ice/ice_flex_type.h

···
 enum ice_tunnel_type {
 	TNL_VXLAN = 0,
 	TNL_GENEVE,
+	__TNL_TYPE_CNT,
 	TNL_LAST = 0xFF,
 	TNL_ALL = 0xFF,
 };
···
 	enum ice_tunnel_type type;
 	u16 boost_addr;
 	u16 port;
-	u16 ref;
 	struct ice_boost_tcam_entry *boost_entry;
 	u8 valid;
-	u8 in_use;
-	u8 marked;
 };
 
 #define ICE_TUNNEL_MAX_ENTRIES	16
···
 struct ice_tunnel_table {
 	struct ice_tunnel_entry tbl[ICE_TUNNEL_MAX_ENTRIES];
 	u16 count;
+	u16 valid_count[__TNL_TYPE_CNT];
 };
 
 struct ice_pkg_es {

drivers/net/ethernet/intel/ice/ice_main.c

···
 	}
 
 	netdev->netdev_ops = &ice_netdev_ops;
+	netdev->udp_tunnel_nic_info = &pf->hw.udp_tunnel_nic;
 	ice_set_ethtool_ops(netdev);
 }
 
···
 	struct device *dev = &pdev->dev;
 	struct ice_pf *pf;
 	struct ice_hw *hw;
-	int err;
+	int i, err;
 
 	/* this driver uses devres, see
 	 * Documentation/driver-api/driver-model/devres.rst
···
 
 	ice_devlink_init_regions(pf);
 
+	pf->hw.udp_tunnel_nic.set_port = ice_udp_tunnel_set_port;
+	pf->hw.udp_tunnel_nic.unset_port = ice_udp_tunnel_unset_port;
+	pf->hw.udp_tunnel_nic.flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP;
+	pf->hw.udp_tunnel_nic.shared = &pf->hw.udp_tunnel_shared;
+	i = 0;
+	if (pf->hw.tnl.valid_count[TNL_VXLAN]) {
+		pf->hw.udp_tunnel_nic.tables[i].n_entries =
+			pf->hw.tnl.valid_count[TNL_VXLAN];
+		pf->hw.udp_tunnel_nic.tables[i].tunnel_types =
+			UDP_TUNNEL_TYPE_VXLAN;
+		i++;
+	}
+	if (pf->hw.tnl.valid_count[TNL_GENEVE]) {
+		pf->hw.udp_tunnel_nic.tables[i].n_entries =
+			pf->hw.tnl.valid_count[TNL_GENEVE];
+		pf->hw.udp_tunnel_nic.tables[i].tunnel_types =
+			UDP_TUNNEL_TYPE_GENEVE;
+		i++;
+	}
+
 	pf->num_alloc_vsi = hw->func_caps.guar_num_vsi;
 	if (!pf->num_alloc_vsi) {
 		err = -EIO;
 		goto err_init_pf_unroll;
+	}
+	if (pf->num_alloc_vsi > UDP_TUNNEL_NIC_MAX_SHARING_DEVICES) {
+		dev_warn(&pf->pdev->dev,
+			 "limiting the VSI count due to UDP tunnel limitation %d > %d\n",
+			 pf->num_alloc_vsi, UDP_TUNNEL_NIC_MAX_SHARING_DEVICES);
+		pf->num_alloc_vsi = UDP_TUNNEL_NIC_MAX_SHARING_DEVICES;
 	}
 
 	pf->vsi = devm_kcalloc(dev, pf->num_alloc_vsi, sizeof(*pf->vsi),
···
 }
 
 /**
- * ice_udp_tunnel_add - Get notifications about UDP tunnel ports that come up
- * @netdev: This physical port's netdev
- * @ti: Tunnel endpoint information
- */
-static void
-ice_udp_tunnel_add(struct net_device *netdev, struct udp_tunnel_info *ti)
-{
-	struct ice_netdev_priv *np = netdev_priv(netdev);
-	struct ice_vsi *vsi = np->vsi;
-	struct ice_pf *pf = vsi->back;
-	enum ice_tunnel_type tnl_type;
-	u16 port = ntohs(ti->port);
-	enum ice_status status;
-
-	switch (ti->type) {
-	case UDP_TUNNEL_TYPE_VXLAN:
-		tnl_type = TNL_VXLAN;
-		break;
-	case UDP_TUNNEL_TYPE_GENEVE:
-		tnl_type = TNL_GENEVE;
-		break;
-	default:
-		netdev_err(netdev, "Unknown tunnel type\n");
-		return;
-	}
-
-	status = ice_create_tunnel(&pf->hw, tnl_type, port);
-	if (status == ICE_ERR_OUT_OF_RANGE)
-		netdev_info(netdev, "Max tunneled UDP ports reached, port %d not added\n",
-			    port);
-	else if (status)
-		netdev_err(netdev, "Error adding UDP tunnel - %s\n",
-			   ice_stat_str(status));
-}
-
-/**
- * ice_udp_tunnel_del - Get notifications about UDP tunnel ports that go away
- * @netdev: This physical port's netdev
- * @ti: Tunnel endpoint information
- */
-static void
-ice_udp_tunnel_del(struct net_device *netdev, struct udp_tunnel_info *ti)
-{
-	struct ice_netdev_priv *np = netdev_priv(netdev);
-	struct ice_vsi *vsi = np->vsi;
-	struct ice_pf *pf = vsi->back;
-	u16 port = ntohs(ti->port);
-	enum ice_status status;
-	bool retval;
-
-	retval = ice_tunnel_port_in_use(&pf->hw, port, NULL);
-	if (!retval) {
-		netdev_info(netdev, "port %d not found in UDP tunnels list\n",
-			    port);
-		return;
-	}
-
-	status = ice_destroy_tunnel(&pf->hw, port, false);
-	if (status)
-		netdev_err(netdev, "error deleting port %d from UDP tunnels list\n",
-			   port);
-}
-
-/**
  * ice_open - Called when a network interface becomes active
  * @netdev: network interface device structure
  *
···
 	.ndo_bpf = ice_xdp,
 	.ndo_xdp_xmit = ice_xdp_xmit,
 	.ndo_xsk_wakeup = ice_xsk_wakeup,
-	.ndo_udp_tunnel_add = ice_udp_tunnel_add,
-	.ndo_udp_tunnel_del = ice_udp_tunnel_del,
+	.ndo_udp_tunnel_add = udp_tunnel_nic_add_port,
+	.ndo_udp_tunnel_del = udp_tunnel_nic_del_port,
 };

drivers/net/ethernet/intel/ice/ice_type.h

···
 	struct mutex tnl_lock;
 	struct ice_tunnel_table tnl;
 
+	struct udp_tunnel_nic_shared udp_tunnel_shared;
+	struct udp_tunnel_nic_info udp_tunnel_nic;
+
 	/* HW block tables */
 	struct ice_blk_info blk[ICE_BLK_COUNT];
 	struct mutex fl_profs_locks[ICE_BLK_COUNT];	/* lock fltr profiles */

drivers/net/netdevsim/netdevsim.h

···
 #include <linux/netdevice.h>
 #include <linux/u64_stats_sync.h>
 #include <net/devlink.h>
+#include <net/udp_tunnel.h>
 #include <net/xdp.h>
 
 #define DRV_NAME	"netdevsim"
···
 	struct {
 		u32 inject_error;
 		u32 sleep;
-		u32 ports[2][NSIM_UDP_TUNNEL_N_PORTS];
+		u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS];
+		u32 (*ports)[NSIM_UDP_TUNNEL_N_PORTS];
 		struct debugfs_u32_array dfs_ports[2];
 	} udp_ports;
 
···
 	bool fail_trap_policer_set;
 	bool fail_trap_policer_counter_get;
 	struct {
+		struct udp_tunnel_nic_shared utn_shared;
+		u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS];
 		bool sync_all;
 		bool open_only;
 		bool ipv4_only;
+		bool shared;
+		bool static_iana_vxlan;
 		u32 sleep;
 	} udp_ports;
 };

drivers/net/netdevsim/udp_tunnels.c

···
 		msleep(ns->udp_ports.sleep);
 
 	if (!ret) {
-		if (ns->udp_ports.ports[table][entry])
+		if (ns->udp_ports.ports[table][entry]) {
+			WARN(1, "entry already in use\n");
 			ret = -EBUSY;
-		else
+		} else {
 			ns->udp_ports.ports[table][entry] =
 				be16_to_cpu(ti->port) << 16 | ti->type;
+		}
 	}
 
 	netdev_info(dev, "set [%d, %d] type %d family %d port %d - %d\n",
···
 	if (!ret) {
 		u32 val = be16_to_cpu(ti->port) << 16 | ti->type;
 
-		if (val == ns->udp_ports.ports[table][entry])
+		if (val == ns->udp_ports.ports[table][entry]) {
 			ns->udp_ports.ports[table][entry] = 0;
-		else
+		} else {
+			WARN(1, "entry not installed %x vs %x\n",
+			     val, ns->udp_ports.ports[table][entry]);
 			ret = -ENOENT;
+		}
 	}
 
 	netdev_info(dev, "unset [%d, %d] type %d family %d port %d - %d\n",
···
 	struct net_device *dev = file->private_data;
 	struct netdevsim *ns = netdev_priv(dev);
 
-	memset(&ns->udp_ports.ports, 0, sizeof(ns->udp_ports.ports));
+	memset(ns->udp_ports.ports, 0, sizeof(ns->udp_ports.__ports));
 	rtnl_lock();
 	udp_tunnel_nic_reset_ntf(dev);
 	rtnl_unlock();
···
 {
 	struct netdevsim *ns = netdev_priv(dev);
 	struct udp_tunnel_nic_info *info;
+
+	if (nsim_dev->udp_ports.shared && nsim_dev->udp_ports.open_only) {
+		dev_err(&nsim_dev->nsim_bus_dev->dev,
+			"shared can't be used in conjunction with open_only\n");
+		return -EINVAL;
+	}
+
+	if (!nsim_dev->udp_ports.shared)
+		ns->udp_ports.ports = ns->udp_ports.__ports;
+	else
+		ns->udp_ports.ports = nsim_dev->udp_ports.__ports;
 
 	debugfs_create_u32("udp_ports_inject_error", 0600,
 			   ns->nsim_dev_port->ddir,
···
 		info->flags |= UDP_TUNNEL_NIC_INFO_OPEN_ONLY;
 	if (nsim_dev->udp_ports.ipv4_only)
 		info->flags |= UDP_TUNNEL_NIC_INFO_IPV4_ONLY;
+	if (nsim_dev->udp_ports.shared)
+		info->shared = &nsim_dev->udp_ports.utn_shared;
+	if (nsim_dev->udp_ports.static_iana_vxlan)
+		info->flags |= UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN;
 
 	dev->udp_tunnel_nic_info = info;
 	return 0;
···
 			    &nsim_dev->udp_ports.open_only);
 	debugfs_create_bool("udp_ports_ipv4_only", 0600, nsim_dev->ddir,
 			    &nsim_dev->udp_ports.ipv4_only);
+	debugfs_create_bool("udp_ports_shared", 0600, nsim_dev->ddir,
+			    &nsim_dev->udp_ports.shared);
+	debugfs_create_bool("udp_ports_static_iana_vxlan", 0600, nsim_dev->ddir,
+			    &nsim_dev->udp_ports.static_iana_vxlan);
 	debugfs_create_u32("udp_ports_sleep", 0600, nsim_dev->ddir,
 			   &nsim_dev->udp_ports.sleep);
 }

include/net/udp_tunnel.h

···
 	UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN	= BIT(3),
 };
 
+struct udp_tunnel_nic;
+
+#define UDP_TUNNEL_NIC_MAX_SHARING_DEVICES	(U16_MAX / 2)
+
+struct udp_tunnel_nic_shared {
+	struct udp_tunnel_nic *udp_tunnel_nic_info;
+
+	struct list_head devices;
+};
+
+struct udp_tunnel_nic_shared_node {
+	struct net_device *dev;
+	struct list_head list;
+};
+
 /**
  * struct udp_tunnel_nic_info - driver UDP tunnel offload information
  * @set_port:	callback for adding a new port
  * @unset_port:	callback for removing a port
  * @sync_table:	callback for syncing the entire port table at once
+ * @shared:	reference to device global state (optional)
  * @flags:	device flags from enum udp_tunnel_nic_info_flags
  * @tables:	UDP port tables this device has
  * @tables.n_entries:		number of entries in this table
···
  *
  * Drivers are expected to provide either @set_port and @unset_port callbacks
  * or the @sync_table callback. Callbacks are invoked with rtnl lock held.
+ *
+ * Devices which (misguidedly) share the UDP tunnel port table across multiple
+ * netdevs should allocate an instance of struct udp_tunnel_nic_shared and
+ * point @shared at it.
+ * There must never be more than %UDP_TUNNEL_NIC_MAX_SHARING_DEVICES devices
+ * sharing a table.
  *
  * Known limitations:
  *  - UDP tunnel port notifications are fundamentally best-effort -
···
 
 	/* all at once */
 	int (*sync_table)(struct net_device *dev, unsigned int table);
+
+	struct udp_tunnel_nic_shared *shared;
 
 	unsigned int flags;
 

net/ipv4/udp_tunnel_nic.c

···
 struct udp_tunnel_nic_table_entry {
 	__be16 port;
 	u8 type;
-	u8 use_cnt;
 	u8 flags;
+	u16 use_cnt;
+#define UDP_TUNNEL_NIC_USE_CNT_MAX	U16_MAX
 	u8 hw_priv;
 };
 
···
 	bool dodgy = entry->flags & UDP_TUNNEL_NIC_ENTRY_OP_FAIL;
 	unsigned int from, to;
 
+	WARN_ON(entry->use_cnt + (u32)use_cnt_adj > U16_MAX);
+
 	/* If not going from used to unused or vice versa - all done.
 	 * For dodgy entries make sure we try to sync again (queue the entry).
 	 */
···
 udp_tunnel_nic_replay(struct net_device *dev, struct udp_tunnel_nic *utn)
 {
 	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic_shared_node *node;
 	unsigned int i, j;
 
 	/* Freeze all the ports we are already tracking so that the replay
···
 	utn->missed = 0;
 	utn->need_replay = 0;
 
-	udp_tunnel_get_rx_info(dev);
+	if (!info->shared) {
+		udp_tunnel_get_rx_info(dev);
+	} else {
+		list_for_each_entry(node, &info->shared->devices, list)
+			udp_tunnel_get_rx_info(node->dev);
+	}
 
 	for (i = 0; i < utn->n_tables; i++)
 		for (j = 0; j < info->tables[i].n_entries; j++)
···
 	return NULL;
 }
 
+static void udp_tunnel_nic_free(struct udp_tunnel_nic *utn)
+{
+	unsigned int i;
+
+	for (i = 0; i < utn->n_tables; i++)
+		kfree(utn->entries[i]);
+	kfree(utn->entries);
+	kfree(utn);
+}
+
 static int udp_tunnel_nic_register(struct net_device *dev)
 {
 	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+	struct udp_tunnel_nic_shared_node *node = NULL;
 	struct udp_tunnel_nic *utn;
 	unsigned int n_tables, i;
 
 	BUILD_BUG_ON(sizeof(utn->missed) * BITS_PER_BYTE <
 		     UDP_TUNNEL_NIC_MAX_TABLES);
+	/* Expect use count of at most 2 (IPv4, IPv6) per device */
+	BUILD_BUG_ON(UDP_TUNNEL_NIC_USE_CNT_MAX <
+		     UDP_TUNNEL_NIC_MAX_SHARING_DEVICES * 2);
 
+	/* Check that the driver info is sane */
 	if (WARN_ON(!info->set_port != !info->unset_port) ||
 	    WARN_ON(!info->set_port == !info->sync_table) ||
 	    WARN_ON(!info->tables[0].n_entries))
+		return -EINVAL;
+
+	if (WARN_ON(info->shared &&
+		    info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY))
 		return -EINVAL;
 
 	n_tables = 1;
···
 			return -EINVAL;
 	}
 
-	utn = udp_tunnel_nic_alloc(info, n_tables);
-	if (!utn)
-		return -ENOMEM;
+	/* Create UDP tunnel state structures */
+	if (info->shared) {
+		node = kzalloc(sizeof(*node), GFP_KERNEL);
+		if (!node)
+			return -ENOMEM;
+
+		node->dev = dev;
+	}
+
+	if (info->shared && info->shared->udp_tunnel_nic_info) {
+		utn = info->shared->udp_tunnel_nic_info;
+	} else {
+		utn = udp_tunnel_nic_alloc(info, n_tables);
+		if (!utn) {
+			kfree(node);
+			return -ENOMEM;
+		}
+	}
+
+	if (info->shared) {
+		if (!info->shared->udp_tunnel_nic_info) {
+			INIT_LIST_HEAD(&info->shared->devices);
+			info->shared->udp_tunnel_nic_info = utn;
+		}
+
+		list_add_tail(&node->list, &info->shared->devices);
+	}
 
 	utn->dev = dev;
 	dev_hold(dev);
···
 static void
 udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn)
 {
-	unsigned int i;
+	const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;
+
+	/* For a shared table remove this dev from the list of sharing devices
+	 * and if there are other devices just detach.
+	 */
+	if (info->shared) {
+		struct udp_tunnel_nic_shared_node *node, *first;
+
+		list_for_each_entry(node, &info->shared->devices, list)
+			if (node->dev == dev)
+				break;
+		if (node->dev != dev)
+			return;
+
+		list_del(&node->list);
+		kfree(node);
+
+		first = list_first_entry_or_null(&info->shared->devices,
+						 typeof(*first), list);
+		if (first) {
+			udp_tunnel_drop_rx_info(dev);
+			utn->dev = first->dev;
+			goto release_dev;
+		}
+
+		info->shared->udp_tunnel_nic_info = NULL;
+	}
 
 	/* Flush before we check work, so we don't waste time adding entries
 	 * from the work which we will boot immediately.
···
 	if (utn->work_pending)
 		return;
 
-	for (i = 0; i < utn->n_tables; i++)
-		kfree(utn->entries[i]);
-	kfree(utn->entries);
-	kfree(utn);
+	udp_tunnel_nic_free(utn);
+release_dev:
 	dev->udp_tunnel_nic = NULL;
 	dev_put(dev);
 }

tools/testing/selftests/drivers/net/netdevsim/udp_tunnel_nic.sh

···
 NSIM_DEV_DFS=/sys/kernel/debug/netdevsim/netdevsim$NSIM_ID
 NSIM_NETDEV=
 HAS_ETHTOOL=
+STATIC_ENTRIES=
 EXIT_STATUS=0
 num_cases=0
 num_errors=0
···
 	sleep 0.02
 	((retries--))
     done
+
+    if [ -n "$HAS_ETHTOOL" -a -n "${STATIC_ENTRIES[0]}" ]; then
+	fail=0
+	for i in "${!STATIC_ENTRIES[@]}"; do
+	    pp_expected=`pre_ethtool ${STATIC_ENTRIES[i]}`
+	    cnt=$(ethtool --show-tunnels $NSIM_NETDEV | grep -c "$pp_expected")
+	    if [ $cnt -ne 1 ]; then
+		err_cnt "ethtool static entry: $pfx - $msg"
+		echo "       check_table: ethtool does not contain '$pp_expected'"
+		ethtool --show-tunnels $NSIM_NETDEV
+		fail=1
+	    fi
+	done
+	[ $fail == 0 ] && pass_cnt
+    fi
 }
 
 function print_table {
···
     exp0=( 0 0 0 0 )
     exp1=( 0 0 0 0 )
 done
+
+cleanup_nsim
+
+# shared port tables
+pfx="table sharing"
+
+echo $NSIM_ID > /sys/bus/netdevsim/new_device
+echo 0 > $NSIM_DEV_SYS/del_port
+
+echo 0 > $NSIM_DEV_DFS/udp_ports_open_only
+echo 1 > $NSIM_DEV_DFS/udp_ports_sleep
+echo 1 > $NSIM_DEV_DFS/udp_ports_shared
+
+old_netdevs=$(ls /sys/class/net)
+echo 1 > $NSIM_DEV_SYS/new_port
+NSIM_NETDEV=`get_netdev_name old_netdevs`
+old_netdevs=$(ls /sys/class/net)
+echo 2 > $NSIM_DEV_SYS/new_port
+NSIM_NETDEV2=`get_netdev_name old_netdevs`
+
+msg="VxLAN v4 devices"
+exp0=( `mke 4789 1` 0 0 0 )
+exp1=( 0 0 0 0 )
+new_vxlan vxlan0 4789 $NSIM_NETDEV
+new_vxlan vxlan1 4789 $NSIM_NETDEV2
+
+msg="VxLAN v4 devices go down"
+exp0=( 0 0 0 0 )
+ifconfig vxlan1 down
+ifconfig vxlan0 down
+check_tables
+
+for ifc in vxlan0 vxlan1; do
+    ifconfig $ifc up
+done
+
+msg="VxLAN v6 device"
+exp0=( `mke 4789 1` `mke 4790 1` 0 0 )
+new_vxlan vxlanC 4790 $NSIM_NETDEV 6
+
+msg="Geneve device"
+exp1=( `mke 6081 2` 0 0 0 )
+new_geneve gnv0 6081
+
+msg="NIC device goes down"
+ifconfig $NSIM_NETDEV down
+check_tables
+
+msg="NIC device goes up again"
+ifconfig $NSIM_NETDEV up
+check_tables
+
+for i in `seq 2`; do
+    msg="turn feature off - 1, rep $i"
+    ethtool -K $NSIM_NETDEV rx-udp_tunnel-port-offload off
+    check_tables
+
+    msg="turn feature off - 2, rep $i"
+    exp0=( 0 0 0 0 )
+    exp1=( 0 0 0 0 )
+    ethtool -K $NSIM_NETDEV2 rx-udp_tunnel-port-offload off
+    check_tables
+
+    msg="turn feature on - 1, rep $i"
+    exp0=( `mke 4789 1` `mke 4790 1` 0 0 )
+    exp1=( `mke 6081 2` 0 0 0 )
+    ethtool -K $NSIM_NETDEV rx-udp_tunnel-port-offload on
+    check_tables
+
+    msg="turn feature on - 2, rep $i"
+    ethtool -K $NSIM_NETDEV2 rx-udp_tunnel-port-offload on
+    check_tables
+done
+
+msg="tunnels destroyed 1"
+cleanup_tuns
+exp0=( 0 0 0 0 )
+exp1=( 0 0 0 0 )
+check_tables
+
+overflow_table0 "overflow NIC table"
+
+msg="re-add a port"
+
+echo 2 > $NSIM_DEV_SYS/del_port
+echo 2 > $NSIM_DEV_SYS/new_port
+check_tables
+
+msg="replace VxLAN in overflow table"
+exp0=( `mke 10000 1` `mke 10004 1` `mke 10002 1` `mke 10003 1` )
+del_dev vxlan1
+
+msg="vacate VxLAN in overflow table"
+exp0=( `mke 10000 1` `mke 10004 1` 0 `mke 10003 1` )
+del_dev vxlan2
+
+echo 1 > $NSIM_DEV_DFS/ports/$port/udp_ports_reset
+check_tables
+
+msg="tunnels destroyed 2"
+cleanup_tuns
+exp0=( 0 0 0 0 )
+exp1=( 0 0 0 0 )
+check_tables
+
+echo 1 > $NSIM_DEV_SYS/del_port
+echo 2 > $NSIM_DEV_SYS/del_port
+
+cleanup_nsim
+
+# Static IANA port
+pfx="static IANA vxlan"
+
+echo $NSIM_ID > /sys/bus/netdevsim/new_device
+echo 0 > $NSIM_DEV_SYS/del_port
+
+echo 1 > $NSIM_DEV_DFS/udp_ports_static_iana_vxlan
+STATIC_ENTRIES=( `mke 4789 1` )
+
+port=1
+old_netdevs=$(ls /sys/class/net)
+echo $port > $NSIM_DEV_SYS/new_port
+NSIM_NETDEV=`get_netdev_name old_netdevs`
+
+msg="check empty"
+exp0=( 0 0 0 0 )
+exp1=( 0 0 0 0 )
+check_tables
+
+msg="add on static port"
+new_vxlan vxlan0 4789 $NSIM_NETDEV
+new_vxlan vxlan1 4789 $NSIM_NETDEV
+
+msg="add on different port"
+exp0=( `mke 4790 1` 0 0 0 )
+new_vxlan vxlan2 4790 $NSIM_NETDEV
+
+cleanup_tuns
+
+msg="tunnels destroyed"
+exp0=( 0 0 0 0 )
+exp1=( 0 0 0 0 )
+check_tables
+
+msg="different type"
+new_geneve gnv0	4789
+
+cleanup_tuns
+cleanup_nsim
+
+# END
 
 modprobe -r netdevsim