Merge tag 'net-next-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
 "Core:

   - Remove socket skb caches

   - Add a SO_RESERVE_MEM socket op to forward allocate buffer space and
     avoid memory accounting overhead on each message sent

   - Introduce managed neighbor entries - added by control plane and
     resolved by the kernel for use in acceleration paths (BPF / XDP
     right now, HW offload users will benefit as well)

   - Make neighbor eviction on link down controllable by userspace to
     work around WiFi networks with bad roaming implementations

   - vrf: Rework interaction with netfilter/conntrack

   - fq_codel: implement L4S style ce_threshold_ect1 marking

   - sch: Eliminate unnecessary RCU waits in mini_qdisc_pair_swap()

  BPF:

   - Add support for new btf kind BTF_KIND_TAG, arbitrary type tagging
     as implemented in LLVM14

   - Introduce bpf_get_branch_snapshot() to capture Last Branch Records

   - Implement variadic trace_printk helper

   - Add a new Bloomfilter map type

   - Track <8-byte scalar spill and refill

   - Access hw timestamp through BPF's __sk_buff

   - Disallow unprivileged BPF by default

   - Document BPF licensing

  Netfilter:

   - Introduce egress hook for looking at raw outgoing packets

   - Allow matching on and modifying inner headers / payload data

   - Add NFT_META_IFTYPE to match on the interface type either from
     ingress or egress

  Protocols:

   - Multi-Path TCP:
      - increase default max additional subflows to 2
      - rework forward memory allocation
      - add getsockopts: MPTCP_INFO, MPTCP_TCPINFO, MPTCP_SUBFLOW_ADDRS

   - MCTP flow support allowing lower layer drivers to configure msg
     muxing as needed

   - Automatic Multicast Tunneling (AMT) driver based on RFC7450

   - HSR support the redbox supervision frames (IEC-62439-3:2018)

   - Support for the ip6ip6 encapsulation of IOAM

   - Netlink interface for CAN-FD's Transmitter Delay Compensation

   - Support SMC-Rv2 eliminating the current same-subnet restriction, by
     exploiting the UDP encapsulation feature of RoCE adapters

   - TLS: add SM4 GCM/CCM crypto support

   - Bluetooth: initial support for link quality and audio/codec offload

  Driver APIs:

   - Add a batched interface for RX buffer allocation in AF_XDP buffer
     pool

   - ethtool: Add ability to control transceiver modules' power mode

   - phy: Introduce supported interfaces bitmap to express MAC
     capabilities and simplify PHY code

   - Drop rtnl_lock from DSA .port_fdb_{add,del} callbacks

  New drivers:

   - WiFi driver for Realtek 8852AE 802.11ax devices (rtw89)

   - Ethernet driver for ASIX AX88796C SPI device (x88796c)

  Drivers:

   - Broadcom PHYs
      - support 72165, 7712 16nm PHYs
      - support IDDQ-SR for additional power savings

   - PHY support for QCA8081, QCA9561 PHYs

   - NXP DPAA2: support for IRQ coalescing

   - NXP Ethernet (enetc): support for software TCP segmentation

   - Renesas Ethernet (ravb) - support DMAC and EMAC blocks of
     Gigabit-capable IP found on RZ/G2L SoC

   - Intel 100G Ethernet
      - support for eswitch offload of TC/OvS flow API, including
        offload of GRE, VxLAN, Geneve tunneling
      - support application device queues - ability to assign Rx and Tx
        queues to application threads
      - PTP and PPS (pulse-per-second) extensions

   - Broadcom Ethernet (bnxt)
      - devlink health reporting and device reload extensions

   - Mellanox Ethernet (mlx5)
      - offload macvlan interfaces
      - support HW offload of TC rules involving OVS internal ports
      - support HW-GRO and header/data split
      - support application device queues

   - Marvell OcteonTx2:
      - add XDP support for PF
      - add PTP support for VF

   - Qualcomm Ethernet switch (qca8k): support for QCA8328

   - Realtek Ethernet DSA switch (rtl8366rb)
      - support bridge offload
      - support STP, fast aging, disabling address learning
      - support for Realtek RTL8365MB-VC, a 4+1 port 10M/100M/1GE switch

   - Mellanox Ethernet/IB switch (mlxsw)
      - multi-level qdisc hierarchy offload (e.g. RED, prio and shaping)
      - offload root TBF qdisc as port shaper
      - support multiple routing interface MAC address prefixes
      - support for IP-in-IP with IPv6 underlay

   - MediaTek WiFi (mt76)
      - mt7921 - ASPM, 6GHz, SDIO and testmode support
      - mt7915 - LED and TWT support

   - Qualcomm WiFi (ath11k)
      - include channel rx and tx time in survey dump statistics
      - support for 80P80 and 160 MHz bandwidths
      - support channel 2 in 6 GHz band
      - spectral scan support for QCN9074
      - support for rx decapsulation offload (data frames in 802.3
        format)

   - Qualcomm phone SoC WiFi (wcn36xx)
      - enable Idle Mode Power Save (IMPS) to reduce power consumption
        during idle

   - Bluetooth driver support for MediaTek MT7922 and MT7921

   - Enable support for AOSP Bluetooth extension in Qualcomm WCN399x and
     Realtek 8822C/8852A

   - Microsoft vNIC driver (mana)
      - support hibernation and kexec

   - Google vNIC driver (gve)
      - support for jumbo frames
      - implement Rx page reuse

  Refactor:

   - Make all writes to netdev->dev_addr go thru helpers, so that we can
     add this address to the address rbtree and handle the updates

   - Various TCP cleanups and optimizations including improvements to
     CPU cache use

   - Simplify the gnet_stats, Qdisc stats' handling and remove
     qdisc->running sequence counter

   - Driver changes and API updates to address devlink locking
     deficiencies"

* tag 'net-next-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2122 commits)
  Revert "net: avoid double accounting for pure zerocopy skbs"
  selftests: net: add arp_ndisc_evict_nocarrier
  net: ndisc: introduce ndisc_evict_nocarrier sysctl parameter
  net: arp: introduce arp_evict_nocarrier sysctl parameter
  libbpf: Deprecate AF_XDP support
  kbuild: Unify options for BTF generation for vmlinux and modules
  selftests/bpf: Add a testcase for 64-bit bounds propagation issue.
  bpf: Fix propagation of signed bounds from 64-bit min/max into 32-bit.
  bpf: Fix propagation of bounds from 64-bit min/max into 32-bit and var_off.
  net: vmxnet3: remove multiple false checks in vmxnet3_ethtool.c
  net: avoid double accounting for pure zerocopy skbs
  tcp: rename sk_wmem_free_skb
  netdevsim: fix uninit value in nsim_drv_configure_vfs()
  selftests/bpf: Fix also no-alu32 strobemeta selftest
  bpf: Add missing map_delete_elem method to bloom filter map
  selftests/bpf: Add bloom map success test for userspace calls
  bpf: Add alignment padding for "map_extra" + consolidate holes
  bpf: Bloom filter map naming fixups
  selftests/bpf: Add test cases for struct_ops prog
  bpf: Add dummy BPF STRUCT_OPS for test purpose
  ...

1 files changed, 165 insertions, 39 deletions

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 54313bd57797..54345c096a16 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -56,6 +56,22 @@ static inline unsigned int nsim_dev_port_index_to_vf_index(unsigned int port_ind
 
 static struct dentry *nsim_dev_ddir;
 
+unsigned int nsim_dev_get_vfs(struct nsim_dev *nsim_dev)
+{
+	WARN_ON(!lockdep_rtnl_is_held() &&
+		!lockdep_is_held(&nsim_dev->vfs_lock));
+
+	return nsim_dev->nsim_bus_dev->num_vfs;
+}
+
+static void
+nsim_bus_dev_set_vfs(struct nsim_bus_dev *nsim_bus_dev, unsigned int num_vfs)
+{
+	rtnl_lock();
+	nsim_bus_dev->num_vfs = num_vfs;
+	rtnl_unlock();
+}
+
 #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
 
 static int
@@ -211,6 +227,70 @@ static const struct file_operations nsim_dev_trap_fa_cookie_fops = {
 	.owner = THIS_MODULE,
 };
 
+static ssize_t nsim_bus_dev_max_vfs_read(struct file *file, char __user *data,
+					 size_t count, loff_t *ppos)
+{
+	struct nsim_dev *nsim_dev = file->private_data;
+	char buf[11];
+	ssize_t len;
+
+	len = scnprintf(buf, sizeof(buf), "%u\n",
+			READ_ONCE(nsim_dev->nsim_bus_dev->max_vfs));
+
+	return simple_read_from_buffer(data, count, ppos, buf, len);
+}
+
+static ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
+					  const char __user *data,
+					  size_t count, loff_t *ppos)
+{
+	struct nsim_vf_config *vfconfigs;
+	struct nsim_dev *nsim_dev;
+	char buf[10];
+	ssize_t ret;
+	u32 val;
+
+	if (*ppos != 0)
+		return 0;
+
+	if (count >= sizeof(buf))
+		return -ENOSPC;
+
+	ret = copy_from_user(buf, data, count);
+	if (ret)
+		return -EFAULT;
+	buf[count] = '\0';
+
+	ret = kstrtouint(buf, 10, &val);
+	if (ret)
+		return -EINVAL;
+
+	/* max_vfs limited by the maximum number of provided port indexes */
+	if (val > NSIM_DEV_VF_PORT_INDEX_MAX - NSIM_DEV_VF_PORT_INDEX_BASE)
+		return -ERANGE;
+
+	vfconfigs = kcalloc(val, sizeof(struct nsim_vf_config),
+			    GFP_KERNEL | __GFP_NOWARN);
+	if (!vfconfigs)
+		return -ENOMEM;
+
+	nsim_dev = file->private_data;
+	mutex_lock(&nsim_dev->vfs_lock);
+	/* Reject if VFs are configured */
+	if (nsim_dev_get_vfs(nsim_dev)) {
+		ret = -EBUSY;
+	} else {
+		swap(nsim_dev->vfconfigs, vfconfigs);
+		WRITE_ONCE(nsim_dev->nsim_bus_dev->max_vfs, val);
+		*ppos += count;
+		ret = count;
+	}
+	mutex_unlock(&nsim_dev->vfs_lock);
+
+	kfree(vfconfigs);
+	return ret;
+}
+
 static const struct file_operations nsim_dev_max_vfs_fops = {
 	.open = simple_open,
 	.read = nsim_bus_dev_max_vfs_read,
@@ -259,11 +339,9 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
 	debugfs_create_bool("fail_trap_policer_counter_get", 0600,
 			    nsim_dev->ddir,
 			    &nsim_dev->fail_trap_policer_counter_get);
-	nsim_dev->max_vfs = debugfs_create_file("max_vfs",
-						0600,
-						nsim_dev->ddir,
-						nsim_dev->nsim_bus_dev,
-						&nsim_dev_max_vfs_fops);
+	debugfs_create_file("max_vfs", 0600, nsim_dev->ddir,
+			    nsim_dev, &nsim_dev_max_vfs_fops);
+
 	nsim_dev->nodes_ddir = debugfs_create_dir("rate_nodes", nsim_dev->ddir);
 	if (IS_ERR(nsim_dev->nodes_ddir)) {
 		err = PTR_ERR(nsim_dev->nodes_ddir);
@@ -328,9 +406,9 @@ static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
 		unsigned int vf_id = nsim_dev_port_index_to_vf_index(port_index);
 
 		debugfs_create_u16("tx_share", 0400, nsim_dev_port->ddir,
-				   &nsim_bus_dev->vfconfigs[vf_id].min_tx_rate);
+				   &nsim_dev->vfconfigs[vf_id].min_tx_rate);
 		debugfs_create_u16("tx_max", 0400, nsim_dev_port->ddir,
-				   &nsim_bus_dev->vfconfigs[vf_id].max_tx_rate);
+				   &nsim_dev->vfconfigs[vf_id].max_tx_rate);
 		nsim_dev_port->rate_parent = debugfs_create_file("rate_parent",
 								 0400,
 								 nsim_dev_port->ddir,
@@ -490,7 +568,9 @@ static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
 }
 
 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port);
-int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev, struct netlink_ext_ack *extack)
+
+static int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev,
+				  struct netlink_ext_ack *extack)
 {
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
 	struct nsim_dev_port *nsim_dev_port, *tmp;
@@ -505,13 +585,14 @@ int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev, struct netlink_ext_ack *ex
 	return 0;
 }
 
-int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev, struct netlink_ext_ack *extack)
+static int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev,
+				     struct netlink_ext_ack *extack)
 {
 	struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
 	int i, err;
 
-	for (i = 0; i < nsim_bus_dev->num_vfs; i++) {
-		err = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_VF, i);
+	for (i = 0; i < nsim_dev_get_vfs(nsim_dev); i++) {
+		err = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_VF, i);
 		if (err) {
 			NL_SET_ERR_MSG_MOD(extack, "Failed to initialize VFs' netdevsim ports");
 			pr_err("Failed to initialize VF id=%d. %d.\n", i, err);
@@ -523,7 +604,7 @@ int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev, struct netlink_ext_ack
 
 err_port_add_vfs:
 	for (i--; i >= 0; i--)
-		nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_VF, i);
+		nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_VF, i);
 	return err;
 }
 
@@ -533,7 +614,7 @@ static int nsim_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
 	struct nsim_dev *nsim_dev = devlink_priv(devlink);
 	int err = 0;
 
-	mutex_lock(&nsim_dev->nsim_bus_dev->vfs_lock);
+	mutex_lock(&nsim_dev->vfs_lock);
 	if (mode == nsim_dev->esw_mode)
 		goto unlock;
 
@@ -545,7 +626,7 @@ static int nsim_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
 		err = -EINVAL;
 
 unlock:
-	mutex_unlock(&nsim_dev->nsim_bus_dev->vfs_lock);
+	mutex_unlock(&nsim_dev->vfs_lock);
 	return err;
 }
 
@@ -1093,7 +1174,7 @@ static int nsim_leaf_tx_share_set(struct devlink_rate *devlink_rate, void *priv,
 				  u64 tx_share, struct netlink_ext_ack *extack)
 {
 	struct nsim_dev_port *nsim_dev_port = priv;
-	struct nsim_bus_dev *nsim_bus_dev = nsim_dev_port->ns->nsim_bus_dev;
+	struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
 	int vf_id = nsim_dev_port_index_to_vf_index(nsim_dev_port->port_index);
 	int err;
 
@@ -1101,7 +1182,7 @@ static int nsim_leaf_tx_share_set(struct devlink_rate *devlink_rate, void *priv,
 	if (err)
 		return err;
 
-	nsim_bus_dev->vfconfigs[vf_id].min_tx_rate = tx_share;
+	nsim_dev->vfconfigs[vf_id].min_tx_rate = tx_share;
 	return 0;
 }
 
@@ -1109,7 +1190,7 @@ static int nsim_leaf_tx_max_set(struct devlink_rate *devlink_rate, void *priv,
 				u64 tx_max, struct netlink_ext_ack *extack)
 {
 	struct nsim_dev_port *nsim_dev_port = priv;
-	struct nsim_bus_dev *nsim_bus_dev = nsim_dev_port->ns->nsim_bus_dev;
+	struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
 	int vf_id = nsim_dev_port_index_to_vf_index(nsim_dev_port->port_index);
 	int err;
 
@@ -1117,7 +1198,7 @@ static int nsim_leaf_tx_max_set(struct devlink_rate *devlink_rate, void *priv,
 	if (err)
 		return err;
 
-	nsim_bus_dev->vfconfigs[vf_id].max_tx_rate = tx_max;
+	nsim_dev->vfconfigs[vf_id].max_tx_rate = tx_max;
 	return 0;
 }
 
@@ -1273,13 +1354,12 @@ static const struct devlink_ops nsim_dev_devlink_ops = {
 static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
 			       unsigned int port_index)
 {
-	struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
 	struct devlink_port_attrs attrs = {};
 	struct nsim_dev_port *nsim_dev_port;
 	struct devlink_port *devlink_port;
 	int err;
 
-	if (type == NSIM_DEV_PORT_TYPE_VF && !nsim_bus_dev->num_vfs)
+	if (type == NSIM_DEV_PORT_TYPE_VF && !nsim_dev_get_vfs(nsim_dev))
 		return -EINVAL;
 
 	nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
@@ -1442,7 +1522,7 @@ err_dummy_region_exit:
 	return err;
 }
 
-int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
+int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 {
 	struct nsim_dev *nsim_dev;
 	struct devlink *devlink;
@@ -1457,6 +1537,7 @@ int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 	nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
 	get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 	INIT_LIST_HEAD(&nsim_dev->port_list);
+	mutex_init(&nsim_dev->vfs_lock);
 	mutex_init(&nsim_dev->port_list_lock);
 	nsim_dev->fw_update_status = true;
 	nsim_dev->fw_update_overwrite_mask = 0;
@@ -1466,13 +1547,17 @@ int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 
 	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
 
-	err = nsim_dev_resources_register(devlink);
-	if (err)
+	nsim_dev->vfconfigs = kcalloc(nsim_bus_dev->max_vfs,
+				      sizeof(struct nsim_vf_config),
+				      GFP_KERNEL | __GFP_NOWARN);
+	if (!nsim_dev->vfconfigs) {
+		err = -ENOMEM;
 		goto err_devlink_free;
+	}
 
-	err = devlink_register(devlink);
+	err = nsim_dev_resources_register(devlink);
 	if (err)
-		goto err_resources_unregister;
+		goto err_vfc_free;
 
 	err = devlink_params_register(devlink, nsim_devlink_params,
 				      ARRAY_SIZE(nsim_devlink_params));
@@ -1514,9 +1599,9 @@ int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 	if (err)
 		goto err_psample_exit;
 
-	devlink_params_publish(devlink);
-	devlink_reload_enable(devlink);
 	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
+	devlink_set_features(devlink, DEVLINK_F_RELOAD);
+	devlink_register(devlink);
 	return 0;
 
 err_psample_exit:
@@ -1537,11 +1622,12 @@ err_params_unregister:
 	devlink_params_unregister(devlink, nsim_devlink_params,
 				  ARRAY_SIZE(nsim_devlink_params));
 err_dl_unregister:
-	devlink_unregister(devlink);
-err_resources_unregister:
 	devlink_resources_unregister(devlink, NULL);
+err_vfc_free:
+	kfree(nsim_dev->vfconfigs);
 err_devlink_free:
 	devlink_free(devlink);
+	dev_set_drvdata(&nsim_bus_dev->dev, NULL);
 	return err;
 }
 
@@ -1553,10 +1639,13 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
 		return;
 	debugfs_remove(nsim_dev->take_snapshot);
 
-	mutex_lock(&nsim_dev->nsim_bus_dev->vfs_lock);
-	if (nsim_dev->nsim_bus_dev->num_vfs)
-		nsim_bus_dev_vfs_disable(nsim_dev->nsim_bus_dev);
-	mutex_unlock(&nsim_dev->nsim_bus_dev->vfs_lock);
+	mutex_lock(&nsim_dev->vfs_lock);
+	if (nsim_dev_get_vfs(nsim_dev)) {
+		nsim_bus_dev_set_vfs(nsim_dev->nsim_bus_dev, 0);
+		if (nsim_esw_mode_is_switchdev(nsim_dev))
+			nsim_esw_legacy_enable(nsim_dev, NULL);
+	}
+	mutex_unlock(&nsim_dev->vfs_lock);
 
 	nsim_dev_port_del_all(nsim_dev);
 	nsim_dev_psample_exit(nsim_dev);
@@ -1567,22 +1656,22 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
 	mutex_destroy(&nsim_dev->port_list_lock);
 }
 
-void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
+void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
 
-	devlink_reload_disable(devlink);
-
+	devlink_unregister(devlink);
 	nsim_dev_reload_destroy(nsim_dev);
 
 	nsim_bpf_dev_exit(nsim_dev);
 	nsim_dev_debugfs_exit(nsim_dev);
 	devlink_params_unregister(devlink, nsim_devlink_params,
 				  ARRAY_SIZE(nsim_devlink_params));
-	devlink_unregister(devlink);
 	devlink_resources_unregister(devlink, NULL);
+	kfree(nsim_dev->vfconfigs);
 	devlink_free(devlink);
+	dev_set_drvdata(&nsim_bus_dev->dev, NULL);
 }
 
 static struct nsim_dev_port *
@@ -1598,7 +1687,7 @@ __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
 	return NULL;
 }
 
-int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
+int nsim_drv_port_add(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
 		      unsigned int port_index)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
@@ -1613,7 +1702,7 @@ int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type
 	return err;
 }
 
-int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
+int nsim_drv_port_del(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
 		      unsigned int port_index)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
@@ -1630,6 +1719,43 @@ int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type
 	return err;
 }
 
+int nsim_drv_configure_vfs(struct nsim_bus_dev *nsim_bus_dev,
+			   unsigned int num_vfs)
+{
+	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
+	int ret = 0;
+
+	mutex_lock(&nsim_dev->vfs_lock);
+	if (nsim_bus_dev->num_vfs == num_vfs)
+		goto exit_unlock;
+	if (nsim_bus_dev->num_vfs && num_vfs) {
+		ret = -EBUSY;
+		goto exit_unlock;
+	}
+	if (nsim_bus_dev->max_vfs < num_vfs) {
+		ret = -ENOMEM;
+		goto exit_unlock;
+	}
+
+	nsim_bus_dev_set_vfs(nsim_bus_dev, num_vfs);
+	if (nsim_esw_mode_is_switchdev(nsim_dev)) {
+		if (num_vfs) {
+			ret = nsim_esw_switchdev_enable(nsim_dev, NULL);
+			if (ret) {
+				nsim_bus_dev_set_vfs(nsim_bus_dev, 0);
+				goto exit_unlock;
+			}
+		} else {
+			nsim_esw_legacy_enable(nsim_dev, NULL);
+		}
+	}
+
+exit_unlock:
+	mutex_unlock(&nsim_dev->vfs_lock);
+
+	return ret;
+}
+
 int nsim_dev_init(void)
 {
 	nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);