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, 644 insertions, 0 deletions

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
new file mode 100644
index 000000000..e0a13505f
--- /dev/null
+++ b/include/media/v4l2-dev.h
@@ -0,0 +1,644 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *
+ *	V 4 L 2   D R I V E R   H E L P E R   A P I
+ *
+ * Moved from videodev2.h
+ *
+ *	Some commonly needed functions for drivers (v4l2-common.o module)
+ */
+#ifndef _V4L2_DEV_H
+#define _V4L2_DEV_H
+
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+
+#include <media/media-entity.h>
+
+#define VIDEO_MAJOR	81
+
+/**
+ * enum vfl_devnode_type - type of V4L2 device node
+ *
+ * @VFL_TYPE_VIDEO:	for video input/output devices
+ * @VFL_TYPE_VBI:	for vertical blank data (i.e. closed captions, teletext)
+ * @VFL_TYPE_RADIO:	for radio tuners
+ * @VFL_TYPE_SUBDEV:	for V4L2 subdevices
+ * @VFL_TYPE_SDR:	for Software Defined Radio tuners
+ * @VFL_TYPE_TOUCH:	for touch sensors
+ * @VFL_TYPE_MAX:	number of VFL types, must always be last in the enum
+ */
+enum vfl_devnode_type {
+	VFL_TYPE_VIDEO,
+	VFL_TYPE_VBI,
+	VFL_TYPE_RADIO,
+	VFL_TYPE_SUBDEV,
+	VFL_TYPE_SDR,
+	VFL_TYPE_TOUCH,
+	VFL_TYPE_MAX /* Shall be the last one */
+};
+
+/**
+ * enum  vfl_devnode_direction - Identifies if a &struct video_device
+ * 	corresponds to a receiver, a transmitter or a mem-to-mem device.
+ *
+ * @VFL_DIR_RX:		device is a receiver.
+ * @VFL_DIR_TX:		device is a transmitter.
+ * @VFL_DIR_M2M:	device is a memory to memory device.
+ *
+ * Note: Ignored if &enum vfl_devnode_type is %VFL_TYPE_SUBDEV.
+ */
+enum vfl_devnode_direction {
+	VFL_DIR_RX,
+	VFL_DIR_TX,
+	VFL_DIR_M2M,
+};
+
+struct v4l2_ioctl_callbacks;
+struct video_device;
+struct v4l2_device;
+struct v4l2_ctrl_handler;
+
+/**
+ * enum v4l2_video_device_flags - Flags used by &struct video_device
+ *
+ * @V4L2_FL_REGISTERED:
+ *	indicates that a &struct video_device is registered.
+ *	Drivers can clear this flag if they want to block all future
+ *	device access. It is cleared by video_unregister_device.
+ * @V4L2_FL_USES_V4L2_FH:
+ *	indicates that file->private_data points to &struct v4l2_fh.
+ *	This flag is set by the core when v4l2_fh_init() is called.
+ *	All new drivers should use it.
+ * @V4L2_FL_QUIRK_INVERTED_CROP:
+ *	some old M2M drivers use g/s_crop/cropcap incorrectly: crop and
+ *	compose are swapped. If this flag is set, then the selection
+ *	targets are swapped in the g/s_crop/cropcap functions in v4l2-ioctl.c.
+ *	This allows those drivers to correctly implement the selection API,
+ *	but the old crop API will still work as expected in order to preserve
+ *	backwards compatibility.
+ *	Never set this flag for new drivers.
+ * @V4L2_FL_SUBDEV_RO_DEVNODE:
+ *	indicates that the video device node is registered in read-only mode.
+ *	The flag only applies to device nodes registered for sub-devices, it is
+ *	set by the core when the sub-devices device nodes are registered with
+ *	v4l2_device_register_ro_subdev_nodes() and used by the sub-device ioctl
+ *	handler to restrict access to some ioctl calls.
+ */
+enum v4l2_video_device_flags {
+	V4L2_FL_REGISTERED		= 0,
+	V4L2_FL_USES_V4L2_FH		= 1,
+	V4L2_FL_QUIRK_INVERTED_CROP	= 2,
+	V4L2_FL_SUBDEV_RO_DEVNODE	= 3,
+};
+
+/* Priority helper functions */
+
+/**
+ * struct v4l2_prio_state - stores the priority states
+ *
+ * @prios: array with elements to store the array priorities
+ *
+ *
+ * .. note::
+ *    The size of @prios array matches the number of priority types defined
+ *    by enum &v4l2_priority.
+ */
+struct v4l2_prio_state {
+	atomic_t prios[4];
+};
+
+/**
+ * v4l2_prio_init - initializes a struct v4l2_prio_state
+ *
+ * @global: pointer to &struct v4l2_prio_state
+ */
+void v4l2_prio_init(struct v4l2_prio_state *global);
+
+/**
+ * v4l2_prio_change - changes the v4l2 file handler priority
+ *
+ * @global: pointer to the &struct v4l2_prio_state of the device node.
+ * @local: pointer to the desired priority, as defined by enum &v4l2_priority
+ * @new: Priority type requested, as defined by enum &v4l2_priority.
+ *
+ * .. note::
+ *	This function should be used only by the V4L2 core.
+ */
+int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
+		     enum v4l2_priority new);
+
+/**
+ * v4l2_prio_open - Implements the priority logic for a file handler open
+ *
+ * @global: pointer to the &struct v4l2_prio_state of the device node.
+ * @local: pointer to the desired priority, as defined by enum &v4l2_priority
+ *
+ * .. note::
+ *	This function should be used only by the V4L2 core.
+ */
+void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
+
+/**
+ * v4l2_prio_close - Implements the priority logic for a file handler close
+ *
+ * @global: pointer to the &struct v4l2_prio_state of the device node.
+ * @local: priority to be released, as defined by enum &v4l2_priority
+ *
+ * .. note::
+ *	This function should be used only by the V4L2 core.
+ */
+void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
+
+/**
+ * v4l2_prio_max - Return the maximum priority, as stored at the @global array.
+ *
+ * @global: pointer to the &struct v4l2_prio_state of the device node.
+ *
+ * .. note::
+ *	This function should be used only by the V4L2 core.
+ */
+enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
+
+/**
+ * v4l2_prio_check - Implements the priority logic for a file handler close
+ *
+ * @global: pointer to the &struct v4l2_prio_state of the device node.
+ * @local: desired priority, as defined by enum &v4l2_priority local
+ *
+ * .. note::
+ *	This function should be used only by the V4L2 core.
+ */
+int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
+
+/**
+ * struct v4l2_file_operations - fs operations used by a V4L2 device
+ *
+ * @owner: pointer to struct module
+ * @read: operations needed to implement the read() syscall
+ * @write: operations needed to implement the write() syscall
+ * @poll: operations needed to implement the poll() syscall
+ * @unlocked_ioctl: operations needed to implement the ioctl() syscall
+ * @compat_ioctl32: operations needed to implement the ioctl() syscall for
+ *	the special case where the Kernel uses 64 bits instructions, but
+ *	the userspace uses 32 bits.
+ * @get_unmapped_area: called by the mmap() syscall, used when %!CONFIG_MMU
+ * @mmap: operations needed to implement the mmap() syscall
+ * @open: operations needed to implement the open() syscall
+ * @release: operations needed to implement the release() syscall
+ *
+ * .. note::
+ *
+ *	Those operations are used to implemente the fs struct file_operations
+ *	at the V4L2 drivers. The V4L2 core overrides the fs ops with some
+ *	extra logic needed by the subsystem.
+ */
+struct v4l2_file_operations {
+	struct module *owner;
+	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+	__poll_t (*poll) (struct file *, struct poll_table_struct *);
+	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+#ifdef CONFIG_COMPAT
+	long (*compat_ioctl32) (struct file *, unsigned int, unsigned long);
+#endif
+	unsigned long (*get_unmapped_area) (struct file *, unsigned long,
+				unsigned long, unsigned long, unsigned long);
+	int (*mmap) (struct file *, struct vm_area_struct *);
+	int (*open) (struct file *);
+	int (*release) (struct file *);
+};
+
+/*
+ * Newer version of video_device, handled by videodev2.c
+ *	This version moves redundant code from video device code to
+ *	the common handler
+ */
+
+/**
+ * struct video_device - Structure used to create and manage the V4L2 device
+ *	nodes.
+ *
+ * @entity: &struct media_entity
+ * @intf_devnode: pointer to &struct media_intf_devnode
+ * @pipe: &struct media_pipeline
+ * @fops: pointer to &struct v4l2_file_operations for the video device
+ * @device_caps: device capabilities as used in v4l2_capabilities
+ * @dev: &struct device for the video device
+ * @cdev: character device
+ * @v4l2_dev: pointer to &struct v4l2_device parent
+ * @dev_parent: pointer to &struct device parent
+ * @ctrl_handler: Control handler associated with this device node.
+ *	 May be NULL.
+ * @queue: &struct vb2_queue associated with this device node. May be NULL.
+ * @prio: pointer to &struct v4l2_prio_state with device's Priority state.
+ *	 If NULL, then v4l2_dev->prio will be used.
+ * @name: video device name
+ * @vfl_type: V4L device type, as defined by &enum vfl_devnode_type
+ * @vfl_dir: V4L receiver, transmitter or m2m
+ * @minor: device node 'minor'. It is set to -1 if the registration failed
+ * @num: number of the video device node
+ * @flags: video device flags. Use bitops to set/clear/test flags.
+ *	   Contains a set of &enum v4l2_video_device_flags.
+ * @index: attribute to differentiate multiple indices on one physical device
+ * @fh_lock: Lock for all v4l2_fhs
+ * @fh_list: List of &struct v4l2_fh
+ * @dev_debug: Internal device debug flags, not for use by drivers
+ * @tvnorms: Supported tv norms
+ *
+ * @release: video device release() callback
+ * @ioctl_ops: pointer to &struct v4l2_ioctl_ops with ioctl callbacks
+ *
+ * @valid_ioctls: bitmap with the valid ioctls for this device
+ * @lock: pointer to &struct mutex serialization lock
+ *
+ * .. note::
+ *	Only set @dev_parent if that can't be deduced from @v4l2_dev.
+ */
+
+struct video_device {
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	struct media_entity entity;
+	struct media_intf_devnode *intf_devnode;
+	struct media_pipeline pipe;
+#endif
+	const struct v4l2_file_operations *fops;
+
+	u32 device_caps;
+
+	/* sysfs */
+	struct device dev;
+	struct cdev *cdev;
+
+	struct v4l2_device *v4l2_dev;
+	struct device *dev_parent;
+
+	struct v4l2_ctrl_handler *ctrl_handler;
+
+	struct vb2_queue *queue;
+
+	struct v4l2_prio_state *prio;
+
+	/* device info */
+	char name[32];
+	enum vfl_devnode_type vfl_type;
+	enum vfl_devnode_direction vfl_dir;
+	int minor;
+	u16 num;
+	unsigned long flags;
+	int index;
+
+	/* V4L2 file handles */
+	spinlock_t		fh_lock;
+	struct list_head	fh_list;
+
+	int dev_debug;
+
+	v4l2_std_id tvnorms;
+
+	/* callbacks */
+	void (*release)(struct video_device *vdev);
+	const struct v4l2_ioctl_ops *ioctl_ops;
+	DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
+
+	struct mutex *lock;
+};
+
+/**
+ * media_entity_to_video_device - Returns a &struct video_device from
+ *	the &struct media_entity embedded on it.
+ *
+ * @__entity: pointer to &struct media_entity
+ */
+#define media_entity_to_video_device(__entity) \
+	container_of(__entity, struct video_device, entity)
+
+/**
+ * to_video_device - Returns a &struct video_device from the
+ *	&struct device embedded on it.
+ *
+ * @cd: pointer to &struct device
+ */
+#define to_video_device(cd) container_of(cd, struct video_device, dev)
+
+/**
+ * __video_register_device - register video4linux devices
+ *
+ * @vdev: struct video_device to register
+ * @type: type of device to register, as defined by &enum vfl_devnode_type
+ * @nr:   which device node number is desired:
+ *	(0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
+ * @warn_if_nr_in_use: warn if the desired device node number
+ *        was already in use and another number was chosen instead.
+ * @owner: module that owns the video device node
+ *
+ * The registration code assigns minor numbers and device node numbers
+ * based on the requested type and registers the new device node with
+ * the kernel.
+ *
+ * This function assumes that struct video_device was zeroed when it
+ * was allocated and does not contain any stale date.
+ *
+ * An error is returned if no free minor or device node number could be
+ * found, or if the registration of the device node failed.
+ *
+ * Returns 0 on success.
+ *
+ * .. note::
+ *
+ *	This function is meant to be used only inside the V4L2 core.
+ *	Drivers should use video_register_device() or
+ *	video_register_device_no_warn().
+ */
+int __must_check __video_register_device(struct video_device *vdev,
+					 enum vfl_devnode_type type,
+					 int nr, int warn_if_nr_in_use,
+					 struct module *owner);
+
+/**
+ *  video_register_device - register video4linux devices
+ *
+ * @vdev: struct video_device to register
+ * @type: type of device to register, as defined by &enum vfl_devnode_type
+ * @nr:   which device node number is desired:
+ *	(0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
+ *
+ * Internally, it calls __video_register_device(). Please see its
+ * documentation for more details.
+ *
+ * .. note::
+ *	if video_register_device fails, the release() callback of
+ *	&struct video_device structure is *not* called, so the caller
+ *	is responsible for freeing any data. Usually that means that
+ *	you video_device_release() should be called on failure.
+ */
+static inline int __must_check video_register_device(struct video_device *vdev,
+						     enum vfl_devnode_type type,
+						     int nr)
+{
+	return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
+}
+
+/**
+ *  video_register_device_no_warn - register video4linux devices
+ *
+ * @vdev: struct video_device to register
+ * @type: type of device to register, as defined by &enum vfl_devnode_type
+ * @nr:   which device node number is desired:
+ *	(0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
+ *
+ * This function is identical to video_register_device() except that no
+ * warning is issued if the desired device node number was already in use.
+ *
+ * Internally, it calls __video_register_device(). Please see its
+ * documentation for more details.
+ *
+ * .. note::
+ *	if video_register_device fails, the release() callback of
+ *	&struct video_device structure is *not* called, so the caller
+ *	is responsible for freeing any data. Usually that means that
+ *	you video_device_release() should be called on failure.
+ */
+static inline int __must_check
+video_register_device_no_warn(struct video_device *vdev,
+			      enum vfl_devnode_type type, int nr)
+{
+	return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
+}
+
+/**
+ * video_unregister_device - Unregister video devices.
+ *
+ * @vdev: &struct video_device to register
+ *
+ * Does nothing if vdev == NULL or if video_is_registered() returns false.
+ */
+void video_unregister_device(struct video_device *vdev);
+
+/**
+ * video_device_alloc - helper function to alloc &struct video_device
+ *
+ * Returns NULL if %-ENOMEM or a &struct video_device on success.
+ */
+struct video_device * __must_check video_device_alloc(void);
+
+/**
+ * video_device_release - helper function to release &struct video_device
+ *
+ * @vdev: pointer to &struct video_device
+ *
+ * Can also be used for video_device->release\(\).
+ */
+void video_device_release(struct video_device *vdev);
+
+/**
+ * video_device_release_empty - helper function to implement the
+ *	video_device->release\(\) callback.
+ *
+ * @vdev: pointer to &struct video_device
+ *
+ * This release function does nothing.
+ *
+ * It should be used when the video_device is a static global struct.
+ *
+ * .. note::
+ *	Having a static video_device is a dubious construction at best.
+ */
+void video_device_release_empty(struct video_device *vdev);
+
+/**
+ * v4l2_disable_ioctl- mark that a given command isn't implemented.
+ *	shouldn't use core locking
+ *
+ * @vdev: pointer to &struct video_device
+ * @cmd: ioctl command
+ *
+ * This function allows drivers to provide just one v4l2_ioctl_ops struct, but
+ * disable ioctls based on the specific card that is actually found.
+ *
+ * .. note::
+ *
+ *    This must be called before video_register_device.
+ *    See also the comments for determine_valid_ioctls().
+ */
+static inline void v4l2_disable_ioctl(struct video_device *vdev,
+				      unsigned int cmd)
+{
+	if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
+		set_bit(_IOC_NR(cmd), vdev->valid_ioctls);
+}
+
+/**
+ * video_get_drvdata - gets private data from &struct video_device.
+ *
+ * @vdev: pointer to &struct video_device
+ *
+ * returns a pointer to the private data
+ */
+static inline void *video_get_drvdata(struct video_device *vdev)
+{
+	return dev_get_drvdata(&vdev->dev);
+}
+
+/**
+ * video_set_drvdata - sets private data from &struct video_device.
+ *
+ * @vdev: pointer to &struct video_device
+ * @data: private data pointer
+ */
+static inline void video_set_drvdata(struct video_device *vdev, void *data)
+{
+	dev_set_drvdata(&vdev->dev, data);
+}
+
+/**
+ * video_devdata - gets &struct video_device from struct file.
+ *
+ * @file: pointer to struct file
+ */
+struct video_device *video_devdata(struct file *file);
+
+/**
+ * video_drvdata - gets private data from &struct video_device using the
+ *	struct file.
+ *
+ * @file: pointer to struct file
+ *
+ * This is function combines both video_get_drvdata() and video_devdata()
+ * as this is used very often.
+ */
+static inline void *video_drvdata(struct file *file)
+{
+	return video_get_drvdata(video_devdata(file));
+}
+
+/**
+ * video_device_node_name - returns the video device name
+ *
+ * @vdev: pointer to &struct video_device
+ *
+ * Returns the device name string
+ */
+static inline const char *video_device_node_name(struct video_device *vdev)
+{
+	return dev_name(&vdev->dev);
+}
+
+/**
+ * video_is_registered - returns true if the &struct video_device is registered.
+ *
+ *
+ * @vdev: pointer to &struct video_device
+ */
+static inline int video_is_registered(struct video_device *vdev)
+{
+	return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
+}
+
+#if defined(CONFIG_MEDIA_CONTROLLER)
+
+/**
+ * video_device_pipeline_start - Mark a pipeline as streaming
+ * @vdev: Starting video device
+ * @pipe: Media pipeline to be assigned to all entities in the pipeline.
+ *
+ * Mark all entities connected to a given video device through enabled links,
+ * either directly or indirectly, as streaming. The given pipeline object is
+ * assigned to every pad in the pipeline and stored in the media_pad pipe
+ * field.
+ *
+ * Calls to this function can be nested, in which case the same number of
+ * video_device_pipeline_stop() calls will be required to stop streaming. The
+ * pipeline pointer must be identical for all nested calls to
+ * video_device_pipeline_start().
+ *
+ * The video device must contain a single pad.
+ *
+ * This is a convenience wrapper around media_pipeline_start().
+ */
+__must_check int video_device_pipeline_start(struct video_device *vdev,
+					     struct media_pipeline *pipe);
+
+/**
+ * __video_device_pipeline_start - Mark a pipeline as streaming
+ * @vdev: Starting video device
+ * @pipe: Media pipeline to be assigned to all entities in the pipeline.
+ *
+ * ..note:: This is the non-locking version of video_device_pipeline_start()
+ *
+ * The video device must contain a single pad.
+ *
+ * This is a convenience wrapper around __media_pipeline_start().
+ */
+__must_check int __video_device_pipeline_start(struct video_device *vdev,
+					       struct media_pipeline *pipe);
+
+/**
+ * video_device_pipeline_stop - Mark a pipeline as not streaming
+ * @vdev: Starting video device
+ *
+ * Mark all entities connected to a given video device through enabled links,
+ * either directly or indirectly, as not streaming. The media_pad pipe field
+ * is reset to %NULL.
+ *
+ * If multiple calls to media_pipeline_start() have been made, the same
+ * number of calls to this function are required to mark the pipeline as not
+ * streaming.
+ *
+ * The video device must contain a single pad.
+ *
+ * This is a convenience wrapper around media_pipeline_stop().
+ */
+void video_device_pipeline_stop(struct video_device *vdev);
+
+/**
+ * __video_device_pipeline_stop - Mark a pipeline as not streaming
+ * @vdev: Starting video device
+ *
+ * .. note:: This is the non-locking version of media_pipeline_stop()
+ *
+ * The video device must contain a single pad.
+ *
+ * This is a convenience wrapper around __media_pipeline_stop().
+ */
+void __video_device_pipeline_stop(struct video_device *vdev);
+
+/**
+ * video_device_pipeline_alloc_start - Mark a pipeline as streaming
+ * @vdev: Starting video device
+ *
+ * video_device_pipeline_alloc_start() is similar to video_device_pipeline_start()
+ * but instead of working on a given pipeline the function will use an
+ * existing pipeline if the video device is already part of a pipeline, or
+ * allocate a new pipeline.
+ *
+ * Calls to video_device_pipeline_alloc_start() must be matched with
+ * video_device_pipeline_stop().
+ */
+__must_check int video_device_pipeline_alloc_start(struct video_device *vdev);
+
+/**
+ * video_device_pipeline - Get the media pipeline a video device is part of
+ * @vdev: The video device
+ *
+ * This function returns the media pipeline that a video device has been
+ * associated with when constructing the pipeline with
+ * video_device_pipeline_start(). The pointer remains valid until
+ * video_device_pipeline_stop() is called.
+ *
+ * Return: The media_pipeline the video device is part of, or NULL if the video
+ * device is not part of any pipeline.
+ *
+ * The video device must contain a single pad.
+ *
+ * This is a convenience wrapper around media_entity_pipeline().
+ */
+struct media_pipeline *video_device_pipeline(struct video_device *vdev);
+
+#endif /* CONFIG_MEDIA_CONTROLLER */
+
+#endif /* _V4L2_DEV_H */