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, 597 insertions, 0 deletions

diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
new file mode 100644
index 000000000..1bdaea248
--- /dev/null
+++ b/include/media/v4l2-common.h
@@ -0,0 +1,597 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+    v4l2 common internal API header
+
+    This header contains internal shared ioctl definitions for use by the
+    internal low-level v4l2 drivers.
+    Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal
+    define,
+
+    Copyright (C) 2005  Hans Verkuil <hverkuil@xs4all.nl>
+
+ */
+
+#ifndef V4L2_COMMON_H_
+#define V4L2_COMMON_H_
+
+#include <linux/time.h>
+#include <media/v4l2-dev.h>
+
+/* Common printk constructs for v4l-i2c drivers. These macros create a unique
+   prefix consisting of the driver name, the adapter number and the i2c
+   address. */
+#define v4l_printk(level, name, adapter, addr, fmt, arg...) \
+	printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)
+
+#define v4l_client_printk(level, client, fmt, arg...)			    \
+	v4l_printk(level, (client)->dev.driver->name, (client)->adapter, \
+		   (client)->addr, fmt , ## arg)
+
+#define v4l_err(client, fmt, arg...) \
+	v4l_client_printk(KERN_ERR, client, fmt , ## arg)
+
+#define v4l_warn(client, fmt, arg...) \
+	v4l_client_printk(KERN_WARNING, client, fmt , ## arg)
+
+#define v4l_info(client, fmt, arg...) \
+	v4l_client_printk(KERN_INFO, client, fmt , ## arg)
+
+/* These three macros assume that the debug level is set with a module
+   parameter called 'debug'. */
+#define v4l_dbg(level, debug, client, fmt, arg...)			     \
+	do {								     \
+		if (debug >= (level))					     \
+			v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
+	} while (0)
+
+/* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */
+#define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...)		\
+	do {								\
+		if (__debug >= (__level))				\
+			dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg);	\
+	} while (0)
+
+/* ------------------------------------------------------------------------- */
+
+/* These printk constructs can be used with v4l2_device and v4l2_subdev */
+#define v4l2_printk(level, dev, fmt, arg...) \
+	printk(level "%s: " fmt, (dev)->name , ## arg)
+
+#define v4l2_err(dev, fmt, arg...) \
+	v4l2_printk(KERN_ERR, dev, fmt , ## arg)
+
+#define v4l2_warn(dev, fmt, arg...) \
+	v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
+
+#define v4l2_info(dev, fmt, arg...) \
+	v4l2_printk(KERN_INFO, dev, fmt , ## arg)
+
+/* These three macros assume that the debug level is set with a module
+   parameter called 'debug'. */
+#define v4l2_dbg(level, debug, dev, fmt, arg...)			\
+	do {								\
+		if (debug >= (level))					\
+			v4l2_printk(KERN_DEBUG, dev, fmt , ## arg);	\
+	} while (0)
+
+/**
+ * v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl
+ *
+ * @qctrl: pointer to the &struct v4l2_queryctrl to be filled
+ * @min: minimum value for the control
+ * @max: maximum value for the control
+ * @step: control step
+ * @def: default value for the control
+ *
+ * Fills the &struct v4l2_queryctrl fields for the query control.
+ *
+ * .. note::
+ *
+ *    This function assumes that the @qctrl->id field is filled.
+ *
+ * Returns -EINVAL if the control is not known by the V4L2 core, 0 on success.
+ */
+
+int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl,
+			 s32 min, s32 max, s32 step, s32 def);
+
+/* ------------------------------------------------------------------------- */
+
+struct v4l2_device;
+struct v4l2_subdev;
+struct v4l2_subdev_ops;
+
+/* I2C Helper functions */
+#include <linux/i2c.h>
+
+/**
+ * enum v4l2_i2c_tuner_type - specifies the range of tuner address that
+ *	should be used when seeking for I2C devices.
+ *
+ * @ADDRS_RADIO:		Radio tuner addresses.
+ *				Represent the following I2C addresses:
+ *				0x10 (if compiled with tea5761 support)
+ *				and 0x60.
+ * @ADDRS_DEMOD:		Demod tuner addresses.
+ *				Represent the following I2C addresses:
+ *				0x42, 0x43, 0x4a and 0x4b.
+ * @ADDRS_TV:			TV tuner addresses.
+ *				Represent the following I2C addresses:
+ *				0x42, 0x43, 0x4a, 0x4b, 0x60, 0x61, 0x62,
+ *				0x63 and 0x64.
+ * @ADDRS_TV_WITH_DEMOD:	TV tuner addresses if demod is present, this
+ *				excludes addresses used by the demodulator
+ *				from the list of candidates.
+ *				Represent the following I2C addresses:
+ *				0x60, 0x61, 0x62, 0x63 and 0x64.
+ *
+ * NOTE: All I2C addresses above use the 7-bit notation.
+ */
+enum v4l2_i2c_tuner_type {
+	ADDRS_RADIO,
+	ADDRS_DEMOD,
+	ADDRS_TV,
+	ADDRS_TV_WITH_DEMOD,
+};
+
+#if defined(CONFIG_VIDEO_V4L2_I2C)
+
+/**
+ * v4l2_i2c_new_subdev - Load an i2c module and return an initialized
+ *	&struct v4l2_subdev.
+ *
+ * @v4l2_dev: pointer to &struct v4l2_device
+ * @adapter: pointer to struct i2c_adapter
+ * @client_type:  name of the chip that's on the adapter.
+ * @addr: I2C address. If zero, it will use @probe_addrs
+ * @probe_addrs: array with a list of address. The last entry at such
+ *	array should be %I2C_CLIENT_END.
+ *
+ * returns a &struct v4l2_subdev pointer.
+ */
+struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
+		struct i2c_adapter *adapter, const char *client_type,
+		u8 addr, const unsigned short *probe_addrs);
+
+/**
+ * v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized
+ *	&struct v4l2_subdev.
+ *
+ * @v4l2_dev: pointer to &struct v4l2_device
+ * @adapter: pointer to struct i2c_adapter
+ * @info: pointer to struct i2c_board_info used to replace the irq,
+ *	 platform_data and addr arguments.
+ * @probe_addrs: array with a list of address. The last entry at such
+ *	array should be %I2C_CLIENT_END.
+ *
+ * returns a &struct v4l2_subdev pointer.
+ */
+struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
+		struct i2c_adapter *adapter, struct i2c_board_info *info,
+		const unsigned short *probe_addrs);
+
+/**
+ * v4l2_i2c_subdev_set_name - Set name for an I²C sub-device
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ * @client: pointer to struct i2c_client
+ * @devname: the name of the device; if NULL, the I²C device drivers's name
+ *           will be used
+ * @postfix: sub-device specific string to put right after the I²C device name;
+ *	     may be NULL
+ */
+void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client,
+			      const char *devname, const char *postfix);
+
+/**
+ * v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from
+ *	an i2c_client struct.
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ * @client: pointer to struct i2c_client
+ * @ops: pointer to &struct v4l2_subdev_ops
+ */
+void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
+		const struct v4l2_subdev_ops *ops);
+
+/**
+ * v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev.
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ *
+ * Returns the address of an I2C sub-device
+ */
+unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
+
+/**
+ * v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe.
+ *
+ * @type: type of the tuner to seek, as defined by
+ *	  &enum v4l2_i2c_tuner_type.
+ *
+ * NOTE: Use only if the tuner addresses are unknown.
+ */
+const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);
+
+/**
+ * v4l2_i2c_subdev_unregister - Unregister a v4l2_subdev
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ */
+void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd);
+
+#else
+
+static inline struct v4l2_subdev *
+v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
+		    struct i2c_adapter *adapter, const char *client_type,
+		    u8 addr, const unsigned short *probe_addrs)
+{
+	return NULL;
+}
+
+static inline struct v4l2_subdev *
+v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
+			  struct i2c_adapter *adapter, struct i2c_board_info *info,
+			  const unsigned short *probe_addrs)
+{
+	return NULL;
+}
+
+static inline void
+v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client,
+			 const char *devname, const char *postfix)
+{}
+
+static inline void
+v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
+		     const struct v4l2_subdev_ops *ops)
+{}
+
+static inline unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
+{
+	return I2C_CLIENT_END;
+}
+
+static inline const unsigned short *
+v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
+{
+	return NULL;
+}
+
+static inline void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd)
+{}
+
+#endif
+
+/* ------------------------------------------------------------------------- */
+
+/* SPI Helper functions */
+
+#include <linux/spi/spi.h>
+
+#if defined(CONFIG_SPI)
+
+/**
+ *  v4l2_spi_new_subdev - Load an spi module and return an initialized
+ *	&struct v4l2_subdev.
+ *
+ *
+ * @v4l2_dev: pointer to &struct v4l2_device.
+ * @master: pointer to struct spi_master.
+ * @info: pointer to struct spi_board_info.
+ *
+ * returns a &struct v4l2_subdev pointer.
+ */
+struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
+		struct spi_master *master, struct spi_board_info *info);
+
+/**
+ * v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an
+ *	spi_device struct.
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ * @spi: pointer to struct spi_device.
+ * @ops: pointer to &struct v4l2_subdev_ops
+ */
+void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
+		const struct v4l2_subdev_ops *ops);
+
+/**
+ * v4l2_spi_subdev_unregister - Unregister a v4l2_subdev
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ */
+void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd);
+
+#else
+
+static inline struct v4l2_subdev *
+v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
+		    struct spi_master *master, struct spi_board_info *info)
+{
+	return NULL;
+}
+
+static inline void
+v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
+		     const struct v4l2_subdev_ops *ops)
+{}
+
+static inline void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd)
+{}
+#endif
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * FIXME: these remaining ioctls/structs should be removed as well, but they
+ * are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET).
+ * To remove these ioctls some more cleanup is needed in those modules.
+ *
+ * It doesn't make much sense on documenting them, as what we really want is
+ * to get rid of them.
+ */
+
+/* s_config */
+struct v4l2_priv_tun_config {
+	int tuner;
+	void *priv;
+};
+#define TUNER_SET_CONFIG           _IOW('d', 92, struct v4l2_priv_tun_config)
+
+#define VIDIOC_INT_RESET		_IOW ('d', 102, u32)
+
+/* ------------------------------------------------------------------------- */
+
+/* Miscellaneous helper functions */
+
+/**
+ * v4l_bound_align_image - adjust video dimensions according to
+ *	a given constraints.
+ *
+ * @width:	pointer to width that will be adjusted if needed.
+ * @wmin:	minimum width.
+ * @wmax:	maximum width.
+ * @walign:	least significant bit on width.
+ * @height:	pointer to height that will be adjusted if needed.
+ * @hmin:	minimum height.
+ * @hmax:	maximum height.
+ * @halign:	least significant bit on height.
+ * @salign:	least significant bit for the image size (e. g.
+ *		:math:`width * height`).
+ *
+ * Clip an image to have @width between @wmin and @wmax, and @height between
+ * @hmin and @hmax, inclusive.
+ *
+ * Additionally, the @width will be a multiple of :math:`2^{walign}`,
+ * the @height will be a multiple of :math:`2^{halign}`, and the overall
+ * size :math:`width * height` will be a multiple of :math:`2^{salign}`.
+ *
+ * .. note::
+ *
+ *    #. The clipping rectangle may be shrunk or enlarged to fit the alignment
+ *       constraints.
+ *    #. @wmax must not be smaller than @wmin.
+ *    #. @hmax must not be smaller than @hmin.
+ *    #. The alignments must not be so high there are no possible image
+ *       sizes within the allowed bounds.
+ *    #. @wmin and @hmin must be at least 1 (don't use 0).
+ *    #. For @walign, @halign and @salign, if you don't care about a certain
+ *       alignment, specify ``0``, as :math:`2^0 = 1` and one byte alignment
+ *       is equivalent to no alignment.
+ *    #. If you only want to adjust downward, specify a maximum that's the
+ *       same as the initial value.
+ */
+void v4l_bound_align_image(unsigned int *width, unsigned int wmin,
+			   unsigned int wmax, unsigned int walign,
+			   unsigned int *height, unsigned int hmin,
+			   unsigned int hmax, unsigned int halign,
+			   unsigned int salign);
+
+/**
+ * v4l2_find_nearest_size - Find the nearest size among a discrete
+ *	set of resolutions contained in an array of a driver specific struct.
+ *
+ * @array: a driver specific array of image sizes
+ * @array_size: the length of the driver specific array of image sizes
+ * @width_field: the name of the width field in the driver specific struct
+ * @height_field: the name of the height field in the driver specific struct
+ * @width: desired width.
+ * @height: desired height.
+ *
+ * Finds the closest resolution to minimize the width and height differences
+ * between what requested and the supported resolutions. The size of the width
+ * and height fields in the driver specific must equal to that of u32, i.e. four
+ * bytes.
+ *
+ * Returns the best match or NULL if the length of the array is zero.
+ */
+#define v4l2_find_nearest_size(array, array_size, width_field, height_field, \
+			       width, height)				\
+	({								\
+		BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \
+			     sizeof((array)->height_field) != sizeof(u32)); \
+		(typeof(&(array)[0]))__v4l2_find_nearest_size(		\
+			(array), array_size, sizeof(*(array)),		\
+			offsetof(typeof(*(array)), width_field),	\
+			offsetof(typeof(*(array)), height_field),	\
+			width, height);					\
+	})
+const void *
+__v4l2_find_nearest_size(const void *array, size_t array_size,
+			 size_t entry_size, size_t width_offset,
+			 size_t height_offset, s32 width, s32 height);
+
+/**
+ * v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by
+ *      calling the g_frame_interval op of the given subdev. It only works
+ *      for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
+ *      function name.
+ *
+ * @vdev: the struct video_device pointer. Used to determine the device caps.
+ * @sd: the sub-device pointer.
+ * @a: the VIDIOC_G_PARM argument.
+ */
+int v4l2_g_parm_cap(struct video_device *vdev,
+		    struct v4l2_subdev *sd, struct v4l2_streamparm *a);
+
+/**
+ * v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by
+ *      calling the s_frame_interval op of the given subdev. It only works
+ *      for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
+ *      function name.
+ *
+ * @vdev: the struct video_device pointer. Used to determine the device caps.
+ * @sd: the sub-device pointer.
+ * @a: the VIDIOC_S_PARM argument.
+ */
+int v4l2_s_parm_cap(struct video_device *vdev,
+		    struct v4l2_subdev *sd, struct v4l2_streamparm *a);
+
+/* Compare two v4l2_fract structs */
+#define V4L2_FRACT_COMPARE(a, OP, b)			\
+	((u64)(a).numerator * (b).denominator OP	\
+	(u64)(b).numerator * (a).denominator)
+
+/* ------------------------------------------------------------------------- */
+
+/* Pixel format and FourCC helpers */
+
+/**
+ * enum v4l2_pixel_encoding - specifies the pixel encoding value
+ *
+ * @V4L2_PIXEL_ENC_UNKNOWN:	Pixel encoding is unknown/un-initialized
+ * @V4L2_PIXEL_ENC_YUV:		Pixel encoding is YUV
+ * @V4L2_PIXEL_ENC_RGB:		Pixel encoding is RGB
+ * @V4L2_PIXEL_ENC_BAYER:	Pixel encoding is Bayer
+ */
+enum v4l2_pixel_encoding {
+	V4L2_PIXEL_ENC_UNKNOWN = 0,
+	V4L2_PIXEL_ENC_YUV = 1,
+	V4L2_PIXEL_ENC_RGB = 2,
+	V4L2_PIXEL_ENC_BAYER = 3,
+};
+
+/**
+ * struct v4l2_format_info - information about a V4L2 format
+ * @format: 4CC format identifier (V4L2_PIX_FMT_*)
+ * @pixel_enc: Pixel encoding (see enum v4l2_pixel_encoding above)
+ * @mem_planes: Number of memory planes, which includes the alpha plane (1 to 4).
+ * @comp_planes: Number of component planes, which includes the alpha plane (1 to 4).
+ * @bpp: Array of per-plane bytes per pixel
+ * @hdiv: Horizontal chroma subsampling factor
+ * @vdiv: Vertical chroma subsampling factor
+ * @block_w: Per-plane macroblock pixel width (optional)
+ * @block_h: Per-plane macroblock pixel height (optional)
+ */
+struct v4l2_format_info {
+	u32 format;
+	u8 pixel_enc;
+	u8 mem_planes;
+	u8 comp_planes;
+	u8 bpp[4];
+	u8 hdiv;
+	u8 vdiv;
+	u8 block_w[4];
+	u8 block_h[4];
+};
+
+static inline bool v4l2_is_format_rgb(const struct v4l2_format_info *f)
+{
+	return f && f->pixel_enc == V4L2_PIXEL_ENC_RGB;
+}
+
+static inline bool v4l2_is_format_yuv(const struct v4l2_format_info *f)
+{
+	return f && f->pixel_enc == V4L2_PIXEL_ENC_YUV;
+}
+
+static inline bool v4l2_is_format_bayer(const struct v4l2_format_info *f)
+{
+	return f && f->pixel_enc == V4L2_PIXEL_ENC_BAYER;
+}
+
+const struct v4l2_format_info *v4l2_format_info(u32 format);
+void v4l2_apply_frmsize_constraints(u32 *width, u32 *height,
+				    const struct v4l2_frmsize_stepwise *frmsize);
+int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat,
+		     u32 width, u32 height);
+int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat,
+			u32 width, u32 height);
+
+/**
+ * v4l2_get_link_freq - Get link rate from transmitter
+ *
+ * @handler: The transmitter's control handler
+ * @mul: The multiplier between pixel rate and link frequency. Bits per pixel on
+ *	 D-PHY, samples per clock on parallel. 0 otherwise.
+ * @div: The divisor between pixel rate and link frequency. Number of data lanes
+ *	 times two on D-PHY, 1 on parallel. 0 otherwise.
+ *
+ * This function is intended for obtaining the link frequency from the
+ * transmitter sub-devices. It returns the link rate, either from the
+ * V4L2_CID_LINK_FREQ control implemented by the transmitter, or value
+ * calculated based on the V4L2_CID_PIXEL_RATE implemented by the transmitter.
+ *
+ * Returns link frequency on success, otherwise a negative error code:
+ *	-ENOENT: Link frequency or pixel rate control not found
+ *	-EINVAL: Invalid link frequency value
+ */
+s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul,
+		       unsigned int div);
+
+void v4l2_simplify_fraction(u32 *numerator, u32 *denominator,
+		unsigned int n_terms, unsigned int threshold);
+u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator);
+
+static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf)
+{
+	/*
+	 * When the timestamp comes from 32-bit user space, there may be
+	 * uninitialized data in tv_usec, so cast it to u32.
+	 * Otherwise allow invalid input for backwards compatibility.
+	 */
+	return buf->timestamp.tv_sec * NSEC_PER_SEC +
+		(u32)buf->timestamp.tv_usec * NSEC_PER_USEC;
+}
+
+static inline void v4l2_buffer_set_timestamp(struct v4l2_buffer *buf,
+					     u64 timestamp)
+{
+	struct timespec64 ts = ns_to_timespec64(timestamp);
+
+	buf->timestamp.tv_sec  = ts.tv_sec;
+	buf->timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+}
+
+static inline bool v4l2_is_colorspace_valid(__u32 colorspace)
+{
+	return colorspace > V4L2_COLORSPACE_DEFAULT &&
+	       colorspace < V4L2_COLORSPACE_LAST;
+}
+
+static inline bool v4l2_is_xfer_func_valid(__u32 xfer_func)
+{
+	return xfer_func > V4L2_XFER_FUNC_DEFAULT &&
+	       xfer_func < V4L2_XFER_FUNC_LAST;
+}
+
+static inline bool v4l2_is_ycbcr_enc_valid(__u8 ycbcr_enc)
+{
+	return ycbcr_enc > V4L2_YCBCR_ENC_DEFAULT &&
+	       ycbcr_enc < V4L2_YCBCR_ENC_LAST;
+}
+
+static inline bool v4l2_is_hsv_enc_valid(__u8 hsv_enc)
+{
+	return hsv_enc == V4L2_HSV_ENC_180 || hsv_enc == V4L2_HSV_ENC_256;
+}
+
+static inline bool v4l2_is_quant_valid(__u8 quantization)
+{
+	return quantization == V4L2_QUANTIZATION_FULL_RANGE ||
+	       quantization == V4L2_QUANTIZATION_LIM_RANGE;
+}
+
+#endif /* V4L2_COMMON_H_ */