Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 504 insertions, 0 deletions

diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c
new file mode 100644
index 000000000..85bf8d586
--- /dev/null
+++ b/drivers/nfc/nfcsim.c
@@ -0,0 +1,504 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NFC hardware simulation driver
+ * Copyright (c) 2013, Intel Corporation.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+#include <linux/nfc.h>
+#include <net/nfc/nfc.h>
+#include <net/nfc/digital.h>
+
+#define NFCSIM_ERR(d, fmt, args...) nfc_err(&d->nfc_digital_dev->nfc_dev->dev, \
+					    "%s: " fmt, __func__, ## args)
+
+#define NFCSIM_DBG(d, fmt, args...) dev_dbg(&d->nfc_digital_dev->nfc_dev->dev, \
+					    "%s: " fmt, __func__, ## args)
+
+#define NFCSIM_VERSION "0.2"
+
+#define NFCSIM_MODE_NONE	0
+#define NFCSIM_MODE_INITIATOR	1
+#define NFCSIM_MODE_TARGET	2
+
+#define NFCSIM_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC   | \
+			     NFC_DIGITAL_DRV_CAPS_TG_CRC)
+
+struct nfcsim {
+	struct nfc_digital_dev *nfc_digital_dev;
+
+	struct work_struct recv_work;
+	struct delayed_work send_work;
+
+	struct nfcsim_link *link_in;
+	struct nfcsim_link *link_out;
+
+	bool up;
+	u8 mode;
+	u8 rf_tech;
+
+	u16 recv_timeout;
+
+	nfc_digital_cmd_complete_t cb;
+	void *arg;
+
+	u8 dropframe;
+};
+
+struct nfcsim_link {
+	struct mutex lock;
+
+	u8 rf_tech;
+	u8 mode;
+
+	u8 shutdown;
+
+	struct sk_buff *skb;
+	wait_queue_head_t recv_wait;
+	u8 cond;
+};
+
+static struct nfcsim_link *nfcsim_link_new(void)
+{
+	struct nfcsim_link *link;
+
+	link = kzalloc(sizeof(struct nfcsim_link), GFP_KERNEL);
+	if (!link)
+		return NULL;
+
+	mutex_init(&link->lock);
+	init_waitqueue_head(&link->recv_wait);
+
+	return link;
+}
+
+static void nfcsim_link_free(struct nfcsim_link *link)
+{
+	dev_kfree_skb(link->skb);
+	kfree(link);
+}
+
+static void nfcsim_link_recv_wake(struct nfcsim_link *link)
+{
+	link->cond = 1;
+	wake_up_interruptible(&link->recv_wait);
+}
+
+static void nfcsim_link_set_skb(struct nfcsim_link *link, struct sk_buff *skb,
+				u8 rf_tech, u8 mode)
+{
+	mutex_lock(&link->lock);
+
+	dev_kfree_skb(link->skb);
+	link->skb = skb;
+	link->rf_tech = rf_tech;
+	link->mode = mode;
+
+	mutex_unlock(&link->lock);
+}
+
+static void nfcsim_link_recv_cancel(struct nfcsim_link *link)
+{
+	mutex_lock(&link->lock);
+
+	link->mode = NFCSIM_MODE_NONE;
+
+	mutex_unlock(&link->lock);
+
+	nfcsim_link_recv_wake(link);
+}
+
+static void nfcsim_link_shutdown(struct nfcsim_link *link)
+{
+	mutex_lock(&link->lock);
+
+	link->shutdown = 1;
+	link->mode = NFCSIM_MODE_NONE;
+
+	mutex_unlock(&link->lock);
+
+	nfcsim_link_recv_wake(link);
+}
+
+static struct sk_buff *nfcsim_link_recv_skb(struct nfcsim_link *link,
+					    int timeout, u8 rf_tech, u8 mode)
+{
+	int rc;
+	struct sk_buff *skb;
+
+	rc = wait_event_interruptible_timeout(link->recv_wait,
+					      link->cond,
+					      msecs_to_jiffies(timeout));
+
+	mutex_lock(&link->lock);
+
+	skb = link->skb;
+	link->skb = NULL;
+
+	if (!rc) {
+		rc = -ETIMEDOUT;
+		goto done;
+	}
+
+	if (!skb || link->rf_tech != rf_tech || link->mode == mode) {
+		rc = -EINVAL;
+		goto done;
+	}
+
+	if (link->shutdown) {
+		rc = -ENODEV;
+		goto done;
+	}
+
+done:
+	mutex_unlock(&link->lock);
+
+	if (rc < 0) {
+		dev_kfree_skb(skb);
+		skb = ERR_PTR(rc);
+	}
+
+	link->cond = 0;
+
+	return skb;
+}
+
+static void nfcsim_send_wq(struct work_struct *work)
+{
+	struct nfcsim *dev = container_of(work, struct nfcsim, send_work.work);
+
+	/*
+	 * To effectively send data, the device just wake up its link_out which
+	 * is the link_in of the peer device. The exchanged skb has already been
+	 * stored in the dev->link_out through nfcsim_link_set_skb().
+	 */
+	nfcsim_link_recv_wake(dev->link_out);
+}
+
+static void nfcsim_recv_wq(struct work_struct *work)
+{
+	struct nfcsim *dev = container_of(work, struct nfcsim, recv_work);
+	struct sk_buff *skb;
+
+	skb = nfcsim_link_recv_skb(dev->link_in, dev->recv_timeout,
+				   dev->rf_tech, dev->mode);
+
+	if (!dev->up) {
+		NFCSIM_ERR(dev, "Device is down\n");
+
+		if (!IS_ERR(skb))
+			dev_kfree_skb(skb);
+		return;
+	}
+
+	dev->cb(dev->nfc_digital_dev, dev->arg, skb);
+}
+
+static int nfcsim_send(struct nfc_digital_dev *ddev, struct sk_buff *skb,
+		       u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
+{
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+	u8 delay;
+
+	if (!dev->up) {
+		NFCSIM_ERR(dev, "Device is down\n");
+		return -ENODEV;
+	}
+
+	dev->recv_timeout = timeout;
+	dev->cb = cb;
+	dev->arg = arg;
+
+	schedule_work(&dev->recv_work);
+
+	if (dev->dropframe) {
+		NFCSIM_DBG(dev, "dropping frame (out of %d)\n", dev->dropframe);
+		dev_kfree_skb(skb);
+		dev->dropframe--;
+
+		return 0;
+	}
+
+	if (skb) {
+		nfcsim_link_set_skb(dev->link_out, skb, dev->rf_tech,
+				    dev->mode);
+
+		/* Add random delay (between 3 and 10 ms) before sending data */
+		get_random_bytes(&delay, 1);
+		delay = 3 + (delay & 0x07);
+
+		schedule_delayed_work(&dev->send_work, msecs_to_jiffies(delay));
+	}
+
+	return 0;
+}
+
+static void nfcsim_abort_cmd(struct nfc_digital_dev *ddev)
+{
+	const struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+
+	nfcsim_link_recv_cancel(dev->link_in);
+}
+
+static int nfcsim_switch_rf(struct nfc_digital_dev *ddev, bool on)
+{
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+
+	dev->up = on;
+
+	return 0;
+}
+
+static int nfcsim_in_configure_hw(struct nfc_digital_dev *ddev,
+					  int type, int param)
+{
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+
+	switch (type) {
+	case NFC_DIGITAL_CONFIG_RF_TECH:
+		dev->up = true;
+		dev->mode = NFCSIM_MODE_INITIATOR;
+		dev->rf_tech = param;
+		break;
+
+	case NFC_DIGITAL_CONFIG_FRAMING:
+		break;
+
+	default:
+		NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int nfcsim_in_send_cmd(struct nfc_digital_dev *ddev,
+			       struct sk_buff *skb, u16 timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return nfcsim_send(ddev, skb, timeout, cb, arg);
+}
+
+static int nfcsim_tg_configure_hw(struct nfc_digital_dev *ddev,
+					  int type, int param)
+{
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+
+	switch (type) {
+	case NFC_DIGITAL_CONFIG_RF_TECH:
+		dev->up = true;
+		dev->mode = NFCSIM_MODE_TARGET;
+		dev->rf_tech = param;
+		break;
+
+	case NFC_DIGITAL_CONFIG_FRAMING:
+		break;
+
+	default:
+		NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int nfcsim_tg_send_cmd(struct nfc_digital_dev *ddev,
+			       struct sk_buff *skb, u16 timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return nfcsim_send(ddev, skb, timeout, cb, arg);
+}
+
+static int nfcsim_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
+			    nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return nfcsim_send(ddev, NULL, timeout, cb, arg);
+}
+
+static const struct nfc_digital_ops nfcsim_digital_ops = {
+	.in_configure_hw = nfcsim_in_configure_hw,
+	.in_send_cmd = nfcsim_in_send_cmd,
+
+	.tg_listen = nfcsim_tg_listen,
+	.tg_configure_hw = nfcsim_tg_configure_hw,
+	.tg_send_cmd = nfcsim_tg_send_cmd,
+
+	.abort_cmd = nfcsim_abort_cmd,
+	.switch_rf = nfcsim_switch_rf,
+};
+
+static struct dentry *nfcsim_debugfs_root;
+
+static void nfcsim_debugfs_init(void)
+{
+	nfcsim_debugfs_root = debugfs_create_dir("nfcsim", NULL);
+
+	if (!nfcsim_debugfs_root)
+		pr_err("Could not create debugfs entry\n");
+
+}
+
+static void nfcsim_debugfs_remove(void)
+{
+	debugfs_remove_recursive(nfcsim_debugfs_root);
+}
+
+static void nfcsim_debugfs_init_dev(struct nfcsim *dev)
+{
+	struct dentry *dev_dir;
+	char devname[5]; /* nfcX\0 */
+	u32 idx;
+	int n;
+
+	if (!nfcsim_debugfs_root) {
+		NFCSIM_ERR(dev, "nfcsim debugfs not initialized\n");
+		return;
+	}
+
+	idx = dev->nfc_digital_dev->nfc_dev->idx;
+	n = snprintf(devname, sizeof(devname), "nfc%d", idx);
+	if (n >= sizeof(devname)) {
+		NFCSIM_ERR(dev, "Could not compute dev name for dev %d\n", idx);
+		return;
+	}
+
+	dev_dir = debugfs_create_dir(devname, nfcsim_debugfs_root);
+	if (!dev_dir) {
+		NFCSIM_ERR(dev, "Could not create debugfs entries for nfc%d\n",
+			   idx);
+		return;
+	}
+
+	debugfs_create_u8("dropframe", 0664, dev_dir, &dev->dropframe);
+}
+
+static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in,
+					struct nfcsim_link *link_out)
+{
+	struct nfcsim *dev;
+	int rc;
+
+	dev = kzalloc(sizeof(struct nfcsim), GFP_KERNEL);
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	INIT_DELAYED_WORK(&dev->send_work, nfcsim_send_wq);
+	INIT_WORK(&dev->recv_work, nfcsim_recv_wq);
+
+	dev->nfc_digital_dev =
+			nfc_digital_allocate_device(&nfcsim_digital_ops,
+						    NFC_PROTO_NFC_DEP_MASK,
+						    NFCSIM_CAPABILITIES,
+						    0, 0);
+	if (!dev->nfc_digital_dev) {
+		kfree(dev);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
+
+	dev->link_in = link_in;
+	dev->link_out = link_out;
+
+	rc = nfc_digital_register_device(dev->nfc_digital_dev);
+	if (rc) {
+		pr_err("Could not register digital device (%d)\n", rc);
+		nfc_digital_free_device(dev->nfc_digital_dev);
+		kfree(dev);
+
+		return ERR_PTR(rc);
+	}
+
+	nfcsim_debugfs_init_dev(dev);
+
+	return dev;
+}
+
+static void nfcsim_device_free(struct nfcsim *dev)
+{
+	nfc_digital_unregister_device(dev->nfc_digital_dev);
+
+	dev->up = false;
+
+	nfcsim_link_shutdown(dev->link_in);
+
+	cancel_delayed_work_sync(&dev->send_work);
+	cancel_work_sync(&dev->recv_work);
+
+	nfc_digital_free_device(dev->nfc_digital_dev);
+
+	kfree(dev);
+}
+
+static struct nfcsim *dev0;
+static struct nfcsim *dev1;
+
+static int __init nfcsim_init(void)
+{
+	struct nfcsim_link *link0, *link1;
+	int rc;
+
+	link0 = nfcsim_link_new();
+	link1 = nfcsim_link_new();
+	if (!link0 || !link1) {
+		rc = -ENOMEM;
+		goto exit_err;
+	}
+
+	nfcsim_debugfs_init();
+
+	dev0 = nfcsim_device_new(link0, link1);
+	if (IS_ERR(dev0)) {
+		rc = PTR_ERR(dev0);
+		goto exit_err;
+	}
+
+	dev1 = nfcsim_device_new(link1, link0);
+	if (IS_ERR(dev1)) {
+		nfcsim_device_free(dev0);
+
+		rc = PTR_ERR(dev1);
+		goto exit_err;
+	}
+
+	pr_info("nfcsim " NFCSIM_VERSION " initialized\n");
+
+	return 0;
+
+exit_err:
+	pr_err("Failed to initialize nfcsim driver (%d)\n", rc);
+
+	if (link0)
+		nfcsim_link_free(link0);
+	if (link1)
+		nfcsim_link_free(link1);
+
+	return rc;
+}
+
+static void __exit nfcsim_exit(void)
+{
+	struct nfcsim_link *link0, *link1;
+
+	link0 = dev0->link_in;
+	link1 = dev0->link_out;
+
+	nfcsim_device_free(dev0);
+	nfcsim_device_free(dev1);
+
+	nfcsim_link_free(link0);
+	nfcsim_link_free(link1);
+
+	nfcsim_debugfs_remove();
+}
+
+module_init(nfcsim_init);
+module_exit(nfcsim_exit);
+
+MODULE_DESCRIPTION("NFCSim driver ver " NFCSIM_VERSION);
+MODULE_VERSION(NFCSIM_VERSION);
+MODULE_LICENSE("GPL");