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, 615 insertions, 0 deletions

diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c
new file mode 100644
index 000000000..7463df479
--- /dev/null
+++ b/drivers/watchdog/smsc37b787_wdt.c
@@ -0,0 +1,615 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	SMsC 37B787 Watchdog Timer driver for Linux 2.6.x.x
+ *
+ *	Based on acquirewdt.c by Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *	and some other existing drivers
+ *
+ *	The authors do NOT admit liability nor provide warranty for
+ *	any of this software. This material is provided "AS-IS" in
+ *	the hope that it may be useful for others.
+ *
+ *	(C) Copyright 2003-2006  Sven Anders <anders@anduras.de>
+ *
+ *  History:
+ *	2003 - Created version 1.0 for Linux 2.4.x.
+ *	2006 - Ported to Linux 2.6, added nowayout and MAGICCLOSE
+ *	       features. Released version 1.1
+ *
+ *  Theory of operation:
+ *
+ *	A Watchdog Timer (WDT) is a hardware circuit that can
+ *	reset the computer system in case of a software fault.
+ *	You probably knew that already.
+ *
+ *	Usually a userspace daemon will notify the kernel WDT driver
+ *	via the /dev/watchdog special device file that userspace is
+ *	still alive, at regular intervals.  When such a notification
+ *	occurs, the driver will usually tell the hardware watchdog
+ *	that everything is in order, and that the watchdog should wait
+ *	for yet another little while to reset the system.
+ *	If userspace fails (RAM error, kernel bug, whatever), the
+ *	notifications cease to occur, and the hardware watchdog will
+ *	reset the system (causing a reboot) after the timeout occurs.
+ *
+ * Create device with:
+ *  mknod /dev/watchdog c 10 130
+ *
+ * For an example userspace keep-alive daemon, see:
+ *   Documentation/watchdog/wdt.rst
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+
+/* enable support for minutes as units? */
+/* (does not always work correctly, so disabled by default!) */
+#define SMSC_SUPPORT_MINUTES
+#undef SMSC_SUPPORT_MINUTES
+
+#define MAX_TIMEOUT     255
+
+#define UNIT_SECOND     0
+#define UNIT_MINUTE     1
+
+#define VERSION		"1.1"
+
+#define IOPORT		0x3F0
+#define IOPORT_SIZE     2
+#define IODEV_NO	8
+
+static int unit = UNIT_SECOND;	/* timer's unit */
+static int timeout = 60;	/* timeout value: default is 60 "units" */
+static unsigned long timer_enabled;   /* is the timer enabled? */
+
+static char expect_close;       /* is the close expected? */
+
+static DEFINE_SPINLOCK(io_lock);/* to guard the watchdog from io races */
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+
+/* -- Low level function ----------------------------------------*/
+
+/* unlock the IO chip */
+
+static inline void open_io_config(void)
+{
+	outb(0x55, IOPORT);
+	mdelay(1);
+	outb(0x55, IOPORT);
+}
+
+/* lock the IO chip */
+static inline void close_io_config(void)
+{
+	outb(0xAA, IOPORT);
+}
+
+/* select the IO device */
+static inline void select_io_device(unsigned char devno)
+{
+	outb(0x07, IOPORT);
+	outb(devno, IOPORT+1);
+}
+
+/* write to the control register */
+static inline void write_io_cr(unsigned char reg, unsigned char data)
+{
+	outb(reg, IOPORT);
+	outb(data, IOPORT+1);
+}
+
+/* read from the control register */
+static inline char read_io_cr(unsigned char reg)
+{
+	outb(reg, IOPORT);
+	return inb(IOPORT+1);
+}
+
+/* -- Medium level functions ------------------------------------*/
+
+static inline void gpio_bit12(unsigned char reg)
+{
+	/* -- General Purpose I/O Bit 1.2 --
+	 * Bit 0,   In/Out: 0 = Output, 1 = Input
+	 * Bit 1,   Polarity: 0 = No Invert, 1 = Invert
+	 * Bit 2,   Group Enable Intr.: 0 = Disable, 1 = Enable
+	 * Bit 3/4, Function select: 00 = GPI/O, 01 = WDT, 10 = P17,
+	 *                           11 = Either Edge Triggered Intr. 2
+	 * Bit 5/6  (Reserved)
+	 * Bit 7,   Output Type: 0 = Push Pull Bit, 1 = Open Drain
+	 */
+	write_io_cr(0xE2, reg);
+}
+
+static inline void gpio_bit13(unsigned char reg)
+{
+	/* -- General Purpose I/O Bit 1.3 --
+	 * Bit 0,  In/Out: 0 = Output, 1 = Input
+	 * Bit 1,  Polarity: 0 = No Invert, 1 = Invert
+	 * Bit 2,  Group Enable Intr.: 0 = Disable, 1 = Enable
+	 * Bit 3,  Function select: 0 = GPI/O, 1 = LED
+	 * Bit 4-6 (Reserved)
+	 * Bit 7,  Output Type: 0 = Push Pull Bit, 1 = Open Drain
+	 */
+	write_io_cr(0xE3, reg);
+}
+
+static inline void wdt_timer_units(unsigned char new_units)
+{
+	/* -- Watchdog timer units --
+	 * Bit 0-6 (Reserved)
+	 * Bit 7,  WDT Time-out Value Units Select
+	 *         (0 = Minutes, 1 = Seconds)
+	 */
+	write_io_cr(0xF1, new_units);
+}
+
+static inline void wdt_timeout_value(unsigned char new_timeout)
+{
+	/* -- Watchdog Timer Time-out Value --
+	 * Bit 0-7 Binary coded units (0=Disabled, 1..255)
+	 */
+	write_io_cr(0xF2, new_timeout);
+}
+
+static inline void wdt_timer_conf(unsigned char conf)
+{
+	/* -- Watchdog timer configuration --
+	 * Bit 0   Joystick enable: 0* = No Reset, 1 = Reset WDT upon
+	 *							Gameport I/O
+	 * Bit 1   Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
+	 * Bit 2   Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
+	 * Bit 3   Reset the timer
+	 *         (Wrong in SMsC documentation? Given as: PowerLED Timout
+	 *							Enabled)
+	 * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
+	 *            0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
+	 */
+	write_io_cr(0xF3, conf);
+}
+
+static inline void wdt_timer_ctrl(unsigned char reg)
+{
+	/* -- Watchdog timer control --
+	 * Bit 0   Status Bit: 0 = Timer counting, 1 = Timeout occurred
+	 * Bit 1   Power LED Toggle: 0 = Disable Toggle, 1 = Toggle at 1 Hz
+	 * Bit 2   Force Timeout: 1 = Forces WD timeout event (self-cleaning)
+	 * Bit 3   P20 Force Timeout enabled:
+	 *          0 = P20 activity does not generate the WD timeout event
+	 *          1 = P20 Allows rising edge of P20, from the keyboard
+	 *              controller, to force the WD timeout event.
+	 * Bit 4   (Reserved)
+	 * -- Soft power management --
+	 * Bit 5   Stop Counter: 1 = Stop software power down counter
+	 *            set via register 0xB8, (self-cleaning)
+	 *            (Upon read: 0 = Counter running, 1 = Counter stopped)
+	 * Bit 6   Restart Counter: 1 = Restart software power down counter
+	 *            set via register 0xB8, (self-cleaning)
+	 * Bit 7   SPOFF: 1 = Force software power down (self-cleaning)
+	 */
+	write_io_cr(0xF4, reg);
+}
+
+/* -- Higher level functions ------------------------------------*/
+
+/* initialize watchdog */
+
+static void wb_smsc_wdt_initialize(void)
+{
+	unsigned char old;
+
+	spin_lock(&io_lock);
+	open_io_config();
+	select_io_device(IODEV_NO);
+
+	/* enable the watchdog */
+	gpio_bit13(0x08);  /* Select pin 80 = LED not GPIO */
+	gpio_bit12(0x0A);  /* Set pin 79 = WDT not
+			      GPIO/Output/Polarity=Invert */
+	/* disable the timeout */
+	wdt_timeout_value(0);
+
+	/* reset control register */
+	wdt_timer_ctrl(0x00);
+
+	/* reset configuration register */
+	wdt_timer_conf(0x00);
+
+	/* read old (timer units) register */
+	old = read_io_cr(0xF1) & 0x7F;
+	if (unit == UNIT_SECOND)
+		old |= 0x80;	/* set to seconds */
+
+	/* set the watchdog timer units */
+	wdt_timer_units(old);
+
+	close_io_config();
+	spin_unlock(&io_lock);
+}
+
+/* shutdown the watchdog */
+
+static void wb_smsc_wdt_shutdown(void)
+{
+	spin_lock(&io_lock);
+	open_io_config();
+	select_io_device(IODEV_NO);
+
+	/* disable the watchdog */
+	gpio_bit13(0x09);
+	gpio_bit12(0x09);
+
+	/* reset watchdog config register */
+	wdt_timer_conf(0x00);
+
+	/* reset watchdog control register */
+	wdt_timer_ctrl(0x00);
+
+	/* disable timeout */
+	wdt_timeout_value(0x00);
+
+	close_io_config();
+	spin_unlock(&io_lock);
+}
+
+/* set timeout => enable watchdog */
+
+static void wb_smsc_wdt_set_timeout(unsigned char new_timeout)
+{
+	spin_lock(&io_lock);
+	open_io_config();
+	select_io_device(IODEV_NO);
+
+	/* set Power LED to blink, if we enable the timeout */
+	wdt_timer_ctrl((new_timeout == 0) ? 0x00 : 0x02);
+
+	/* set timeout value */
+	wdt_timeout_value(new_timeout);
+
+	close_io_config();
+	spin_unlock(&io_lock);
+}
+
+/* get timeout */
+
+static unsigned char wb_smsc_wdt_get_timeout(void)
+{
+	unsigned char set_timeout;
+
+	spin_lock(&io_lock);
+	open_io_config();
+	select_io_device(IODEV_NO);
+	set_timeout = read_io_cr(0xF2);
+	close_io_config();
+	spin_unlock(&io_lock);
+
+	return set_timeout;
+}
+
+/* disable watchdog */
+
+static void wb_smsc_wdt_disable(void)
+{
+	/* set the timeout to 0 to disable the watchdog */
+	wb_smsc_wdt_set_timeout(0);
+}
+
+/* enable watchdog by setting the current timeout */
+
+static void wb_smsc_wdt_enable(void)
+{
+	/* set the current timeout... */
+	wb_smsc_wdt_set_timeout(timeout);
+}
+
+/* reset the timer */
+
+static void wb_smsc_wdt_reset_timer(void)
+{
+	spin_lock(&io_lock);
+	open_io_config();
+	select_io_device(IODEV_NO);
+
+	/* reset the timer */
+	wdt_timeout_value(timeout);
+	wdt_timer_conf(0x08);
+
+	close_io_config();
+	spin_unlock(&io_lock);
+}
+
+/* return, if the watchdog is enabled (timeout is set...) */
+
+static int wb_smsc_wdt_status(void)
+{
+	return (wb_smsc_wdt_get_timeout() == 0) ? 0 : WDIOF_KEEPALIVEPING;
+}
+
+
+/* -- File operations -------------------------------------------*/
+
+/* open => enable watchdog and set initial timeout */
+
+static int wb_smsc_wdt_open(struct inode *inode, struct file *file)
+{
+	/* /dev/watchdog can only be opened once */
+
+	if (test_and_set_bit(0, &timer_enabled))
+		return -EBUSY;
+
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	/* Reload and activate timer */
+	wb_smsc_wdt_enable();
+
+	pr_info("Watchdog enabled. Timeout set to %d %s\n",
+		timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
+
+	return stream_open(inode, file);
+}
+
+/* close => shut off the timer */
+
+static int wb_smsc_wdt_release(struct inode *inode, struct file *file)
+{
+	/* Shut off the timer. */
+
+	if (expect_close == 42) {
+		wb_smsc_wdt_disable();
+		pr_info("Watchdog disabled, sleeping again...\n");
+	} else {
+		pr_crit("Unexpected close, not stopping watchdog!\n");
+		wb_smsc_wdt_reset_timer();
+	}
+
+	clear_bit(0, &timer_enabled);
+	expect_close = 0;
+	return 0;
+}
+
+/* write => update the timer to keep the machine alive */
+
+static ssize_t wb_smsc_wdt_write(struct file *file, const char __user *data,
+				 size_t len, loff_t *ppos)
+{
+	/* See if we got the magic character 'V' and reload the timer */
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* reset expect flag */
+			expect_close = 0;
+
+			/* scan to see whether or not we got the
+			   magic character */
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 42;
+			}
+		}
+
+		/* someone wrote to us, we should reload the timer */
+		wb_smsc_wdt_reset_timer();
+	}
+	return len;
+}
+
+/* ioctl => control interface */
+
+static long wb_smsc_wdt_ioctl(struct file *file,
+					unsigned int cmd, unsigned long arg)
+{
+	int new_timeout;
+
+	union {
+		struct watchdog_info __user *ident;
+		int __user *i;
+	} uarg;
+
+	static const struct watchdog_info ident = {
+		.options =		WDIOF_KEEPALIVEPING |
+					WDIOF_SETTIMEOUT |
+					WDIOF_MAGICCLOSE,
+		.firmware_version =	0,
+		.identity =		"SMsC 37B787 Watchdog",
+	};
+
+	uarg.i = (int __user *)arg;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		return copy_to_user(uarg.ident, &ident, sizeof(ident))
+								? -EFAULT : 0;
+	case WDIOC_GETSTATUS:
+		return put_user(wb_smsc_wdt_status(), uarg.i);
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, uarg.i);
+	case WDIOC_SETOPTIONS:
+	{
+		int options, retval = -EINVAL;
+
+		if (get_user(options, uarg.i))
+			return -EFAULT;
+
+		if (options & WDIOS_DISABLECARD) {
+			wb_smsc_wdt_disable();
+			retval = 0;
+		}
+		if (options & WDIOS_ENABLECARD) {
+			wb_smsc_wdt_enable();
+			retval = 0;
+		}
+		return retval;
+	}
+	case WDIOC_KEEPALIVE:
+		wb_smsc_wdt_reset_timer();
+		return 0;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_timeout, uarg.i))
+			return -EFAULT;
+		/* the API states this is given in secs */
+		if (unit == UNIT_MINUTE)
+			new_timeout /= 60;
+		if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
+			return -EINVAL;
+		timeout = new_timeout;
+		wb_smsc_wdt_set_timeout(timeout);
+		fallthrough;	/* and return the new timeout */
+	case WDIOC_GETTIMEOUT:
+		new_timeout = timeout;
+		if (unit == UNIT_MINUTE)
+			new_timeout *= 60;
+		return put_user(new_timeout, uarg.i);
+	default:
+		return -ENOTTY;
+	}
+}
+
+/* -- Notifier funtions -----------------------------------------*/
+
+static int wb_smsc_wdt_notify_sys(struct notifier_block *this,
+					unsigned long code, void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT) {
+		/* set timeout to 0, to avoid possible race-condition */
+		timeout = 0;
+		wb_smsc_wdt_disable();
+	}
+	return NOTIFY_DONE;
+}
+
+/* -- Module's structures ---------------------------------------*/
+
+static const struct file_operations wb_smsc_wdt_fops = {
+	.owner	  = THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= wb_smsc_wdt_write,
+	.unlocked_ioctl	= wb_smsc_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
+	.open		= wb_smsc_wdt_open,
+	.release	= wb_smsc_wdt_release,
+};
+
+static struct notifier_block wb_smsc_wdt_notifier = {
+	.notifier_call  = wb_smsc_wdt_notify_sys,
+};
+
+static struct miscdevice wb_smsc_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &wb_smsc_wdt_fops,
+};
+
+/* -- Module init functions -------------------------------------*/
+
+/* module's "constructor" */
+
+static int __init wb_smsc_wdt_init(void)
+{
+	int ret;
+
+	pr_info("SMsC 37B787 watchdog component driver "
+		VERSION " initialising...\n");
+
+	if (!request_region(IOPORT, IOPORT_SIZE, "SMsC 37B787 watchdog")) {
+		pr_err("Unable to register IO port %#x\n", IOPORT);
+		ret = -EBUSY;
+		goto out_pnp;
+	}
+
+	/* set new maximum, if it's too big */
+	if (timeout > MAX_TIMEOUT)
+		timeout = MAX_TIMEOUT;
+
+	/* init the watchdog timer */
+	wb_smsc_wdt_initialize();
+
+	ret = register_reboot_notifier(&wb_smsc_wdt_notifier);
+	if (ret) {
+		pr_err("Unable to register reboot notifier err = %d\n", ret);
+		goto out_io;
+	}
+
+	ret = misc_register(&wb_smsc_wdt_miscdev);
+	if (ret) {
+		pr_err("Unable to register miscdev on minor %d\n",
+		       WATCHDOG_MINOR);
+		goto out_rbt;
+	}
+
+	/* output info */
+	pr_info("Timeout set to %d %s\n",
+		timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
+	pr_info("Watchdog initialized and sleeping (nowayout=%d)...\n",
+		nowayout);
+out_clean:
+	return ret;
+
+out_rbt:
+	unregister_reboot_notifier(&wb_smsc_wdt_notifier);
+
+out_io:
+	release_region(IOPORT, IOPORT_SIZE);
+
+out_pnp:
+	goto out_clean;
+}
+
+/* module's "destructor" */
+
+static void __exit wb_smsc_wdt_exit(void)
+{
+	/* Stop the timer before we leave */
+	if (!nowayout) {
+		wb_smsc_wdt_shutdown();
+		pr_info("Watchdog disabled\n");
+	}
+
+	misc_deregister(&wb_smsc_wdt_miscdev);
+	unregister_reboot_notifier(&wb_smsc_wdt_notifier);
+	release_region(IOPORT, IOPORT_SIZE);
+
+	pr_info("SMsC 37B787 watchdog component driver removed\n");
+}
+
+module_init(wb_smsc_wdt_init);
+module_exit(wb_smsc_wdt_exit);
+
+MODULE_AUTHOR("Sven Anders <anders@anduras.de>");
+MODULE_DESCRIPTION("Driver for SMsC 37B787 watchdog component (Version "
+								VERSION ")");
+MODULE_LICENSE("GPL");
+
+#ifdef SMSC_SUPPORT_MINUTES
+module_param(unit, int, 0);
+MODULE_PARM_DESC(unit,
+		"set unit to use, 0=seconds or 1=minutes, default is 0");
+#endif
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "range is 1-255 units, default is 60");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");