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, 660 insertions, 0 deletions

diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
new file mode 100644
index 000000000..a20dfa2a9
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
@@ -0,0 +1,660 @@
+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: V4L
+
+.. _VIDIOC_QUERYCTRL:
+
+*******************************************************************
+ioctls VIDIOC_QUERYCTRL, VIDIOC_QUERY_EXT_CTRL and VIDIOC_QUERYMENU
+*******************************************************************
+
+Name
+====
+
+VIDIOC_QUERYCTRL - VIDIOC_QUERY_EXT_CTRL - VIDIOC_QUERYMENU - Enumerate controls and menu control items
+
+Synopsis
+========
+
+``int ioctl(int fd, int VIDIOC_QUERYCTRL, struct v4l2_queryctrl *argp)``
+
+.. c:macro:: VIDIOC_QUERY_EXT_CTRL
+
+``int ioctl(int fd, VIDIOC_QUERY_EXT_CTRL, struct v4l2_query_ext_ctrl *argp)``
+
+.. c:macro:: VIDIOC_QUERYMENU
+
+``int ioctl(int fd, VIDIOC_QUERYMENU, struct v4l2_querymenu *argp)``
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :c:func:`open()`.
+
+``argp``
+    Pointer to struct :c:type:`v4l2_queryctrl`, :c:type:`v4l2_query_ext_ctrl`
+    or :c:type:`v4l2_querymenu` (depending on the ioctl).
+
+Description
+===========
+
+To query the attributes of a control applications set the ``id`` field
+of a struct :ref:`v4l2_queryctrl <v4l2-queryctrl>` and call the
+``VIDIOC_QUERYCTRL`` ioctl with a pointer to this structure. The driver
+fills the rest of the structure or returns an ``EINVAL`` error code when the
+``id`` is invalid.
+
+It is possible to enumerate controls by calling ``VIDIOC_QUERYCTRL``
+with successive ``id`` values starting from ``V4L2_CID_BASE`` up to and
+exclusive ``V4L2_CID_LASTP1``. Drivers may return ``EINVAL`` if a control in
+this range is not supported. Further applications can enumerate private
+controls, which are not defined in this specification, by starting at
+``V4L2_CID_PRIVATE_BASE`` and incrementing ``id`` until the driver
+returns ``EINVAL``.
+
+In both cases, when the driver sets the ``V4L2_CTRL_FLAG_DISABLED`` flag
+in the ``flags`` field this control is permanently disabled and should
+be ignored by the application. [#f1]_
+
+When the application ORs ``id`` with ``V4L2_CTRL_FLAG_NEXT_CTRL`` the
+driver returns the next supported non-compound control, or ``EINVAL`` if
+there is none. In addition, the ``V4L2_CTRL_FLAG_NEXT_COMPOUND`` flag
+can be specified to enumerate all compound controls (i.e. controls with
+type ≥ ``V4L2_CTRL_COMPOUND_TYPES`` and/or array control, in other words
+controls that contain more than one value). Specify both
+``V4L2_CTRL_FLAG_NEXT_CTRL`` and ``V4L2_CTRL_FLAG_NEXT_COMPOUND`` in
+order to enumerate all controls, compound or not. Drivers which do not
+support these flags yet always return ``EINVAL``.
+
+The ``VIDIOC_QUERY_EXT_CTRL`` ioctl was introduced in order to better
+support controls that can use compound types, and to expose additional
+control information that cannot be returned in struct
+:ref:`v4l2_queryctrl <v4l2-queryctrl>` since that structure is full.
+
+``VIDIOC_QUERY_EXT_CTRL`` is used in the same way as
+``VIDIOC_QUERYCTRL``, except that the ``reserved`` array must be zeroed
+as well.
+
+Additional information is required for menu controls: the names of the
+menu items. To query them applications set the ``id`` and ``index``
+fields of struct :ref:`v4l2_querymenu <v4l2-querymenu>` and call the
+``VIDIOC_QUERYMENU`` ioctl with a pointer to this structure. The driver
+fills the rest of the structure or returns an ``EINVAL`` error code when the
+``id`` or ``index`` is invalid. Menu items are enumerated by calling
+``VIDIOC_QUERYMENU`` with successive ``index`` values from struct
+:ref:`v4l2_queryctrl <v4l2-queryctrl>` ``minimum`` to ``maximum``,
+inclusive.
+
+.. note::
+
+   It is possible for ``VIDIOC_QUERYMENU`` to return
+   an ``EINVAL`` error code for some indices between ``minimum`` and
+   ``maximum``. In that case that particular menu item is not supported by
+   this driver. Also note that the ``minimum`` value is not necessarily 0.
+
+See also the examples in :ref:`control`.
+
+.. tabularcolumns:: |p{1.2cm}|p{3.6cm}|p{12.5cm}|
+
+.. _v4l2-queryctrl:
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_queryctrl
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u32
+      - ``id``
+      - Identifies the control, set by the application. See
+	:ref:`control-id` for predefined IDs. When the ID is ORed with
+	V4L2_CTRL_FLAG_NEXT_CTRL the driver clears the flag and
+	returns the first control with a higher ID. Drivers which do not
+	support this flag yet always return an ``EINVAL`` error code.
+    * - __u32
+      - ``type``
+      - Type of control, see :c:type:`v4l2_ctrl_type`.
+    * - __u8
+      - ``name``\ [32]
+      - Name of the control, a NUL-terminated ASCII string. This
+	information is intended for the user.
+    * - __s32
+      - ``minimum``
+      - Minimum value, inclusive. This field gives a lower bound for the
+	control. See enum :c:type:`v4l2_ctrl_type` how
+	the minimum value is to be used for each possible control type.
+	Note that this a signed 32-bit value.
+    * - __s32
+      - ``maximum``
+      - Maximum value, inclusive. This field gives an upper bound for the
+	control. See enum :c:type:`v4l2_ctrl_type` how
+	the maximum value is to be used for each possible control type.
+	Note that this a signed 32-bit value.
+    * - __s32
+      - ``step``
+      - This field gives a step size for the control. See enum
+	:c:type:`v4l2_ctrl_type` how the step value is
+	to be used for each possible control type. Note that this an
+	unsigned 32-bit value.
+
+	Generally drivers should not scale hardware control values. It may
+	be necessary for example when the ``name`` or ``id`` imply a
+	particular unit and the hardware actually accepts only multiples
+	of said unit. If so, drivers must take care values are properly
+	rounded when scaling, such that errors will not accumulate on
+	repeated read-write cycles.
+
+	This field gives the smallest change of an integer control
+	actually affecting hardware. Often the information is needed when
+	the user can change controls by keyboard or GUI buttons, rather
+	than a slider. When for example a hardware register accepts values
+	0-511 and the driver reports 0-65535, step should be 128.
+
+	Note that although signed, the step value is supposed to be always
+	positive.
+    * - __s32
+      - ``default_value``
+      - The default value of a ``V4L2_CTRL_TYPE_INTEGER``, ``_BOOLEAN``,
+	``_BITMASK``, ``_MENU`` or ``_INTEGER_MENU`` control. Not valid
+	for other types of controls.
+
+	.. note::
+
+	   Drivers reset controls to their default value only when
+	   the driver is first loaded, never afterwards.
+    * - __u32
+      - ``flags``
+      - Control flags, see :ref:`control-flags`.
+    * - __u32
+      - ``reserved``\ [2]
+      - Reserved for future extensions. Drivers must set the array to
+	zero.
+
+
+.. tabularcolumns:: |p{1.2cm}|p{5.5cm}|p{10.6cm}|
+
+.. _v4l2-query-ext-ctrl:
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_query_ext_ctrl
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u32
+      - ``id``
+      - Identifies the control, set by the application. See
+	:ref:`control-id` for predefined IDs. When the ID is ORed with
+	``V4L2_CTRL_FLAG_NEXT_CTRL`` the driver clears the flag and
+	returns the first non-compound control with a higher ID. When the
+	ID is ORed with ``V4L2_CTRL_FLAG_NEXT_COMPOUND`` the driver clears
+	the flag and returns the first compound control with a higher ID.
+	Set both to get the first control (compound or not) with a higher
+	ID.
+    * - __u32
+      - ``type``
+      - Type of control, see :c:type:`v4l2_ctrl_type`.
+    * - char
+      - ``name``\ [32]
+      - Name of the control, a NUL-terminated ASCII string. This
+	information is intended for the user.
+    * - __s64
+      - ``minimum``
+      - Minimum value, inclusive. This field gives a lower bound for the
+	control. See enum :c:type:`v4l2_ctrl_type` how
+	the minimum value is to be used for each possible control type.
+	Note that this a signed 64-bit value.
+    * - __s64
+      - ``maximum``
+      - Maximum value, inclusive. This field gives an upper bound for the
+	control. See enum :c:type:`v4l2_ctrl_type` how
+	the maximum value is to be used for each possible control type.
+	Note that this a signed 64-bit value.
+    * - __u64
+      - ``step``
+      - This field gives a step size for the control. See enum
+	:c:type:`v4l2_ctrl_type` how the step value is
+	to be used for each possible control type. Note that this an
+	unsigned 64-bit value.
+
+	Generally drivers should not scale hardware control values. It may
+	be necessary for example when the ``name`` or ``id`` imply a
+	particular unit and the hardware actually accepts only multiples
+	of said unit. If so, drivers must take care values are properly
+	rounded when scaling, such that errors will not accumulate on
+	repeated read-write cycles.
+
+	This field gives the smallest change of an integer control
+	actually affecting hardware. Often the information is needed when
+	the user can change controls by keyboard or GUI buttons, rather
+	than a slider. When for example a hardware register accepts values
+	0-511 and the driver reports 0-65535, step should be 128.
+    * - __s64
+      - ``default_value``
+      - The default value of a ``V4L2_CTRL_TYPE_INTEGER``, ``_INTEGER64``,
+	``_BOOLEAN``, ``_BITMASK``, ``_MENU``, ``_INTEGER_MENU``, ``_U8``
+	or ``_U16`` control. Not valid for other types of controls.
+
+	.. note::
+
+	   Drivers reset controls to their default value only when
+	   the driver is first loaded, never afterwards.
+    * - __u32
+      - ``flags``
+      - Control flags, see :ref:`control-flags`.
+    * - __u32
+      - ``elem_size``
+      - The size in bytes of a single element of the array. Given a char
+	pointer ``p`` to a 3-dimensional array you can find the position
+	of cell ``(z, y, x)`` as follows:
+	``p + ((z * dims[1] + y) * dims[0] + x) * elem_size``.
+	``elem_size`` is always valid, also when the control isn't an
+	array. For string controls ``elem_size`` is equal to
+	``maximum + 1``.
+    * - __u32
+      - ``elems``
+      - The number of elements in the N-dimensional array. If this control
+	is not an array, then ``elems`` is 1. The ``elems`` field can
+	never be 0.
+    * - __u32
+      - ``nr_of_dims``
+      - The number of dimension in the N-dimensional array. If this
+	control is not an array, then this field is 0.
+    * - __u32
+      - ``dims[V4L2_CTRL_MAX_DIMS]``
+      - The size of each dimension. The first ``nr_of_dims`` elements of
+	this array must be non-zero, all remaining elements must be zero.
+    * - __u32
+      - ``reserved``\ [32]
+      - Reserved for future extensions. Applications and drivers must set
+	the array to zero.
+
+
+.. tabularcolumns:: |p{1.2cm}|p{3.0cm}|p{13.1cm}|
+
+.. _v4l2-querymenu:
+
+.. flat-table:: struct v4l2_querymenu
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u32
+      - ``id``
+      - Identifies the control, set by the application from the respective
+	struct :ref:`v4l2_queryctrl <v4l2-queryctrl>` ``id``.
+    * - __u32
+      - ``index``
+      - Index of the menu item, starting at zero, set by the application.
+    * - union {
+      - (anonymous)
+    * - __u8
+      - ``name``\ [32]
+      - Name of the menu item, a NUL-terminated ASCII string. This
+	information is intended for the user. This field is valid for
+	``V4L2_CTRL_TYPE_MENU`` type controls.
+    * - __s64
+      - ``value``
+      - Value of the integer menu item. This field is valid for
+	``V4L2_CTRL_TYPE_INTEGER_MENU`` type controls.
+    * - }
+      -
+    * - __u32
+      - ``reserved``
+      - Reserved for future extensions. Drivers must set the array to
+	zero.
+
+.. c:type:: v4l2_ctrl_type
+
+.. raw:: latex
+
+   \footnotesize
+
+.. tabularcolumns:: |p{6.5cm}|p{1.5cm}|p{1.1cm}|p{1.5cm}|p{6.8cm}|
+
+.. cssclass:: longtable
+
+.. flat-table:: enum v4l2_ctrl_type
+    :header-rows:  1
+    :stub-columns: 0
+    :widths:       30 5 5 5 55
+
+    * - Type
+      - ``minimum``
+      - ``step``
+      - ``maximum``
+      - Description
+    * - ``V4L2_CTRL_TYPE_INTEGER``
+      - any
+      - any
+      - any
+      - An integer-valued control ranging from minimum to maximum
+	inclusive. The step value indicates the increment between values.
+    * - ``V4L2_CTRL_TYPE_BOOLEAN``
+      - 0
+      - 1
+      - 1
+      - A boolean-valued control. Zero corresponds to "disabled", and one
+	means "enabled".
+    * - ``V4L2_CTRL_TYPE_MENU``
+      - ≥ 0
+      - 1
+      - N-1
+      - The control has a menu of N choices. The names of the menu items
+	can be enumerated with the ``VIDIOC_QUERYMENU`` ioctl.
+    * - ``V4L2_CTRL_TYPE_INTEGER_MENU``
+      - ≥ 0
+      - 1
+      - N-1
+      - The control has a menu of N choices. The values of the menu items
+	can be enumerated with the ``VIDIOC_QUERYMENU`` ioctl. This is
+	similar to ``V4L2_CTRL_TYPE_MENU`` except that instead of strings,
+	the menu items are signed 64-bit integers.
+    * - ``V4L2_CTRL_TYPE_BITMASK``
+      - 0
+      - n/a
+      - any
+      - A bitmask field. The maximum value is the set of bits that can be
+	used, all other bits are to be 0. The maximum value is interpreted
+	as a __u32, allowing the use of bit 31 in the bitmask.
+    * - ``V4L2_CTRL_TYPE_BUTTON``
+      - 0
+      - 0
+      - 0
+      - A control which performs an action when set. Drivers must ignore
+	the value passed with ``VIDIOC_S_CTRL`` and return an ``EACCES`` error
+	code on a ``VIDIOC_G_CTRL`` attempt.
+    * - ``V4L2_CTRL_TYPE_INTEGER64``
+      - any
+      - any
+      - any
+      - A 64-bit integer valued control. Minimum, maximum and step size
+	cannot be queried using ``VIDIOC_QUERYCTRL``. Only
+	``VIDIOC_QUERY_EXT_CTRL`` can retrieve the 64-bit min/max/step
+	values, they should be interpreted as n/a when using
+	``VIDIOC_QUERYCTRL``.
+    * - ``V4L2_CTRL_TYPE_STRING``
+      - ≥ 0
+      - ≥ 1
+      - ≥ 0
+      - The minimum and maximum string lengths. The step size means that
+	the string must be (minimum + N * step) characters long for N ≥ 0.
+	These lengths do not include the terminating zero, so in order to
+	pass a string of length 8 to
+	:ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` you need to
+	set the ``size`` field of struct
+	:c:type:`v4l2_ext_control` to 9. For
+	:ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` you can set
+	the ``size`` field to ``maximum`` + 1. Which character encoding is
+	used will depend on the string control itself and should be part
+	of the control documentation.
+    * - ``V4L2_CTRL_TYPE_CTRL_CLASS``
+      - n/a
+      - n/a
+      - n/a
+      - This is not a control. When ``VIDIOC_QUERYCTRL`` is called with a
+	control ID equal to a control class code (see :ref:`ctrl-class`)
+	+ 1, the ioctl returns the name of the control class and this
+	control type. Older drivers which do not support this feature
+	return an ``EINVAL`` error code.
+    * - ``V4L2_CTRL_TYPE_U8``
+      - any
+      - any
+      - any
+      - An unsigned 8-bit valued control ranging from minimum to maximum
+	inclusive. The step value indicates the increment between values.
+    * - ``V4L2_CTRL_TYPE_U16``
+      - any
+      - any
+      - any
+      - An unsigned 16-bit valued control ranging from minimum to maximum
+	inclusive. The step value indicates the increment between values.
+    * - ``V4L2_CTRL_TYPE_U32``
+      - any
+      - any
+      - any
+      - An unsigned 32-bit valued control ranging from minimum to maximum
+	inclusive. The step value indicates the increment between values.
+    * - ``V4L2_CTRL_TYPE_MPEG2_QUANTISATION``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_mpeg2_quantisation`, containing MPEG-2
+	quantisation matrices for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_MPEG2_SEQUENCE``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_mpeg2_sequence`, containing MPEG-2
+	sequence parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_MPEG2_PICTURE``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_mpeg2_picture`, containing MPEG-2
+	picture parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_AREA``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_area`, containing the width and the height
+        of a rectangular area. Units depend on the use case.
+    * - ``V4L2_CTRL_TYPE_H264_SPS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_h264_sps`, containing H264
+	sequence parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_H264_PPS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_h264_pps`, containing H264
+	picture parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_H264_SCALING_MATRIX``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_h264_scaling_matrix`, containing H264
+	scaling matrices for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_H264_SLICE_PARAMS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_h264_slice_params`, containing H264
+	slice parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_H264_DECODE_PARAMS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_h264_decode_params`, containing H264
+	decode parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_FWHT_PARAMS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_fwht_params`, containing FWHT
+	parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_HEVC_SPS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_hevc_sps`, containing HEVC Sequence
+	Parameter Set for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_HEVC_PPS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_hevc_pps`, containing HEVC Picture
+	Parameter Set for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_hevc_slice_params`, containing HEVC
+	slice parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_hevc_scaling_matrix`, containing HEVC
+	scaling matrix for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_VP8_FRAME``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_vp8_frame`, containing VP8
+	frame parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_hevc_decode_params`, containing HEVC
+	decoding parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr`, containing VP9
+	probabilities updates for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_VP9_FRAME``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_vp9_frame`, containing VP9
+	frame decode parameters for stateless video decoders.
+
+.. raw:: latex
+
+   \normalsize
+
+.. tabularcolumns:: |p{7.3cm}|p{1.8cm}|p{8.2cm}|
+
+.. cssclass:: longtable
+
+.. _control-flags:
+
+.. flat-table:: Control Flags
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       3 1 4
+
+    * - ``V4L2_CTRL_FLAG_DISABLED``
+      - 0x0001
+      - This control is permanently disabled and should be ignored by the
+	application. Any attempt to change the control will result in an
+	``EINVAL`` error code.
+    * - ``V4L2_CTRL_FLAG_GRABBED``
+      - 0x0002
+      - This control is temporarily unchangeable, for example because
+	another application took over control of the respective resource.
+	Such controls may be displayed specially in a user interface.
+	Attempts to change the control may result in an ``EBUSY`` error code.
+    * - ``V4L2_CTRL_FLAG_READ_ONLY``
+      - 0x0004
+      - This control is permanently readable only. Any attempt to change
+	the control will result in an ``EINVAL`` error code.
+    * - ``V4L2_CTRL_FLAG_UPDATE``
+      - 0x0008
+      - A hint that changing this control may affect the value of other
+	controls within the same control class. Applications should update
+	their user interface accordingly.
+    * - ``V4L2_CTRL_FLAG_INACTIVE``
+      - 0x0010
+      - This control is not applicable to the current configuration and
+	should be displayed accordingly in a user interface. For example
+	the flag may be set on a MPEG audio level 2 bitrate control when
+	MPEG audio encoding level 1 was selected with another control.
+    * - ``V4L2_CTRL_FLAG_SLIDER``
+      - 0x0020
+      - A hint that this control is best represented as a slider-like
+	element in a user interface.
+    * - ``V4L2_CTRL_FLAG_WRITE_ONLY``
+      - 0x0040
+      - This control is permanently writable only. Any attempt to read the
+	control will result in an ``EACCES`` error code error code. This flag
+	is typically present for relative controls or action controls
+	where writing a value will cause the device to carry out a given
+	action (e. g. motor control) but no meaningful value can be
+	returned.
+    * - ``V4L2_CTRL_FLAG_VOLATILE``
+      - 0x0080
+      - This control is volatile, which means that the value of the
+	control changes continuously. A typical example would be the
+	current gain value if the device is in auto-gain mode. In such a
+	case the hardware calculates the gain value based on the lighting
+	conditions which can change over time.
+
+	.. note::
+
+	   Setting a new value for a volatile control will be ignored
+	   unless
+	   :ref:`V4L2_CTRL_FLAG_EXECUTE_ON_WRITE <FLAG_EXECUTE_ON_WRITE>`
+	   is also set.
+	   Setting a new value for a volatile control will *never* trigger a
+	   :ref:`V4L2_EVENT_CTRL_CH_VALUE <ctrl-changes-flags>` event.
+    * - ``V4L2_CTRL_FLAG_HAS_PAYLOAD``
+      - 0x0100
+      - This control has a pointer type, so its value has to be accessed
+	using one of the pointer fields of struct
+	:c:type:`v4l2_ext_control`. This flag is set
+	for controls that are an array, string, or have a compound type.
+	In all cases you have to set a pointer to memory containing the
+	payload of the control.
+    * .. _FLAG_EXECUTE_ON_WRITE:
+
+      - ``V4L2_CTRL_FLAG_EXECUTE_ON_WRITE``
+      - 0x0200
+      - The value provided to the control will be propagated to the driver
+	even if it remains constant. This is required when the control
+	represents an action on the hardware. For example: clearing an
+	error flag or triggering the flash. All the controls of the type
+	``V4L2_CTRL_TYPE_BUTTON`` have this flag set.
+    * .. _FLAG_MODIFY_LAYOUT:
+
+      - ``V4L2_CTRL_FLAG_MODIFY_LAYOUT``
+      - 0x0400
+      - Changing this control value may modify the layout of the
+        buffer (for video devices) or the media bus format (for sub-devices).
+
+	A typical example would be the ``V4L2_CID_ROTATE`` control.
+
+	Note that typically controls with this flag will also set the
+	``V4L2_CTRL_FLAG_GRABBED`` flag when buffers are allocated or
+	streaming is in progress since most drivers do not support changing
+	the format in that case.
+    * - ``V4L2_CTRL_FLAG_DYNAMIC_ARRAY``
+      - 0x0800
+      - This control is a dynamically sized 1-dimensional array. It
+        behaves the same as a regular array, except that the number
+	of elements as reported by the ``elems`` field is between 1 and
+	``dims[0]``. So setting the control with a differently sized
+	array will change the ``elems`` field when the control is
+	queried afterwards.
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+EINVAL
+    The struct :ref:`v4l2_queryctrl <v4l2-queryctrl>` ``id`` is
+    invalid. The struct :ref:`v4l2_querymenu <v4l2-querymenu>` ``id``
+    is invalid or ``index`` is out of range (less than ``minimum`` or
+    greater than ``maximum``) or this particular menu item is not
+    supported by the driver.
+
+EACCES
+    An attempt was made to read a write-only control.
+
+.. [#f1]
+   ``V4L2_CTRL_FLAG_DISABLED`` was intended for two purposes: Drivers
+   can skip predefined controls not supported by the hardware (although
+   returning ``EINVAL`` would do as well), or disable predefined and private
+   controls after hardware detection without the trouble of reordering
+   control arrays and indices (``EINVAL`` cannot be used to skip private
+   controls because it would prematurely end the enumeration).