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, 281 insertions, 0 deletions

diff --git a/Documentation/input/input.rst b/Documentation/input/input.rst
new file mode 100644
index 000000000..2c67fa904
--- /dev/null
+++ b/Documentation/input/input.rst
@@ -0,0 +1,281 @@
+.. include:: <isonum.txt>
+
+============
+Introduction
+============
+
+:Copyright: |copy| 1999-2001 Vojtech Pavlik <vojtech@ucw.cz> - Sponsored by SuSE
+
+Architecture
+============
+
+Input subsystem is a collection of drivers that is designed to support
+all input devices under Linux. Most of the drivers reside in
+drivers/input, although quite a few live in drivers/hid and
+drivers/platform.
+
+The core of the input subsystem is the input module, which must be
+loaded before any other of the input modules - it serves as a way of
+communication between two groups of modules:
+
+Device drivers
+--------------
+
+These modules talk to the hardware (for example via USB), and provide
+events (keystrokes, mouse movements) to the input module.
+
+Event handlers
+--------------
+
+These modules get events from input core and pass them where needed
+via various interfaces - keystrokes to the kernel, mouse movements via
+a simulated PS/2 interface to GPM and X, and so on.
+
+Simple Usage
+============
+
+For the most usual configuration, with one USB mouse and one USB keyboard,
+you'll have to load the following modules (or have them built in to the
+kernel)::
+
+	input
+	mousedev
+	usbcore
+	uhci_hcd or ohci_hcd or ehci_hcd
+	usbhid
+	hid_generic
+
+After this, the USB keyboard will work straight away, and the USB mouse
+will be available as a character device on major 13, minor 63::
+
+	crw-r--r--   1 root     root      13,  63 Mar 28 22:45 mice
+
+This device is usually created automatically by the system. The commands
+to create it by hand are::
+
+	cd /dev
+	mkdir input
+	mknod input/mice c 13 63
+
+After that you have to point GPM (the textmode mouse cut&paste tool) and
+XFree to this device to use it - GPM should be called like::
+
+	gpm -t ps2 -m /dev/input/mice
+
+And in X::
+
+	Section "Pointer"
+	    Protocol    "ImPS/2"
+	    Device      "/dev/input/mice"
+	    ZAxisMapping 4 5
+	EndSection
+
+When you do all of the above, you can use your USB mouse and keyboard.
+
+Detailed Description
+====================
+
+Event handlers
+--------------
+
+Event handlers distribute the events from the devices to userspace and
+in-kernel consumers, as needed.
+
+evdev
+~~~~~
+
+``evdev`` is the generic input event interface. It passes the events
+generated in the kernel straight to the program, with timestamps. The
+event codes are the same on all architectures and are hardware
+independent.
+
+This is the preferred interface for userspace to consume user
+input, and all clients are encouraged to use it.
+
+See :ref:`event-interface` for notes on API.
+
+The devices are in /dev/input::
+
+	crw-r--r--   1 root     root      13,  64 Apr  1 10:49 event0
+	crw-r--r--   1 root     root      13,  65 Apr  1 10:50 event1
+	crw-r--r--   1 root     root      13,  66 Apr  1 10:50 event2
+	crw-r--r--   1 root     root      13,  67 Apr  1 10:50 event3
+	...
+
+There are two ranges of minors: 64 through 95 is the static legacy
+range. If there are more than 32 input devices in a system, additional
+evdev nodes are created with minors starting with 256.
+
+keyboard
+~~~~~~~~
+
+``keyboard`` is in-kernel input handler and is a part of VT code. It
+consumes keyboard keystrokes and handles user input for VT consoles.
+
+mousedev
+~~~~~~~~
+
+``mousedev`` is a hack to make legacy programs that use mouse input
+work. It takes events from either mice or digitizers/tablets and makes
+a PS/2-style (a la /dev/psaux) mouse device available to the
+userland.
+
+Mousedev devices in /dev/input (as shown above) are::
+
+	crw-r--r--   1 root     root      13,  32 Mar 28 22:45 mouse0
+	crw-r--r--   1 root     root      13,  33 Mar 29 00:41 mouse1
+	crw-r--r--   1 root     root      13,  34 Mar 29 00:41 mouse2
+	crw-r--r--   1 root     root      13,  35 Apr  1 10:50 mouse3
+	...
+	...
+	crw-r--r--   1 root     root      13,  62 Apr  1 10:50 mouse30
+	crw-r--r--   1 root     root      13,  63 Apr  1 10:50 mice
+
+Each ``mouse`` device is assigned to a single mouse or digitizer, except
+the last one - ``mice``. This single character device is shared by all
+mice and digitizers, and even if none are connected, the device is
+present.  This is useful for hotplugging USB mice, so that older programs
+that do not handle hotplug can open the device even when no mice are
+present.
+
+CONFIG_INPUT_MOUSEDEV_SCREEN_[XY] in the kernel configuration are
+the size of your screen (in pixels) in XFree86. This is needed if you
+want to use your digitizer in X, because its movement is sent to X
+via a virtual PS/2 mouse and thus needs to be scaled
+accordingly. These values won't be used if you use a mouse only.
+
+Mousedev will generate either PS/2, ImPS/2 (Microsoft IntelliMouse) or
+ExplorerPS/2 (IntelliMouse Explorer) protocols, depending on what the
+program reading the data wishes. You can set GPM and X to any of
+these. You'll need ImPS/2 if you want to make use of a wheel on a USB
+mouse and ExplorerPS/2 if you want to use extra (up to 5) buttons.
+
+joydev
+~~~~~~
+
+``joydev`` implements v0.x and v1.x Linux joystick API. See
+:ref:`joystick-api` for details.
+
+As soon as any joystick is connected, it can be accessed in /dev/input on::
+
+	crw-r--r--   1 root     root      13,   0 Apr  1 10:50 js0
+	crw-r--r--   1 root     root      13,   1 Apr  1 10:50 js1
+	crw-r--r--   1 root     root      13,   2 Apr  1 10:50 js2
+	crw-r--r--   1 root     root      13,   3 Apr  1 10:50 js3
+	...
+
+And so on up to js31 in legacy range, and additional nodes with minors
+above 256 if there are more joystick devices.
+
+Device drivers
+--------------
+
+Device drivers are the modules that generate events.
+
+hid-generic
+~~~~~~~~~~~
+
+``hid-generic`` is one of the largest and most complex driver of the
+whole suite. It handles all HID devices, and because there is a very
+wide variety of them, and because the USB HID specification isn't
+simple, it needs to be this big.
+
+Currently, it handles USB mice, joysticks, gamepads, steering wheels,
+keyboards, trackballs and digitizers.
+
+However, USB uses HID also for monitor controls, speaker controls, UPSs,
+LCDs and many other purposes.
+
+The monitor and speaker controls should be easy to add to the hid/input
+interface, but for the UPSs and LCDs it doesn't make much sense. For this,
+the hiddev interface was designed. See Documentation/hid/hiddev.rst
+for more information about it.
+
+The usage of the usbhid module is very simple, it takes no parameters,
+detects everything automatically and when a HID device is inserted, it
+detects it appropriately.
+
+However, because the devices vary wildly, you might happen to have a
+device that doesn't work well. In that case #define DEBUG at the beginning
+of hid-core.c and send me the syslog traces.
+
+usbmouse
+~~~~~~~~
+
+For embedded systems, for mice with broken HID descriptors and just any
+other use when the big usbhid wouldn't be a good choice, there is the
+usbmouse driver. It handles USB mice only. It uses a simpler HIDBP
+protocol. This also means the mice must support this simpler protocol. Not
+all do. If you don't have any strong reason to use this module, use usbhid
+instead.
+
+usbkbd
+~~~~~~
+
+Much like usbmouse, this module talks to keyboards with a simplified
+HIDBP protocol. It's smaller, but doesn't support any extra special keys.
+Use usbhid instead if there isn't any special reason to use this.
+
+psmouse
+~~~~~~~
+
+This is driver for all flavors of pointing devices using PS/2
+protocol, including Synaptics and ALPS touchpads, Intellimouse
+Explorer devices, Logitech PS/2 mice and so on.
+
+atkbd
+~~~~~
+
+This is driver for PS/2 (AT) keyboards.
+
+iforce
+~~~~~~
+
+A driver for I-Force joysticks and wheels, both over USB and RS232.
+It includes Force Feedback support now, even though Immersion
+Corp. considers the protocol a trade secret and won't disclose a word
+about it.
+
+Verifying if it works
+=====================
+
+Typing a couple keys on the keyboard should be enough to check that
+a keyboard works and is correctly connected to the kernel keyboard
+driver.
+
+Doing a ``cat /dev/input/mouse0`` (c, 13, 32) will verify that a mouse
+is also emulated; characters should appear if you move it.
+
+You can test the joystick emulation with the ``jstest`` utility,
+available in the joystick package (see :ref:`joystick-doc`).
+
+You can test the event devices with the ``evtest`` utility.
+
+.. _event-interface:
+
+Event interface
+===============
+
+You can use blocking and nonblocking reads, and also select() on the
+/dev/input/eventX devices, and you'll always get a whole number of input
+events on a read. Their layout is::
+
+    struct input_event {
+	    struct timeval time;
+	    unsigned short type;
+	    unsigned short code;
+	    unsigned int value;
+    };
+
+``time`` is the timestamp, it returns the time at which the event happened.
+Type is for example EV_REL for relative movement, EV_KEY for a keypress or
+release. More types are defined in include/uapi/linux/input-event-codes.h.
+
+``code`` is event code, for example REL_X or KEY_BACKSPACE, again a complete
+list is in include/uapi/linux/input-event-codes.h.
+
+``value`` is the value the event carries. Either a relative change for
+EV_REL, absolute new value for EV_ABS (joysticks ...), or 0 for EV_KEY for
+release, 1 for keypress and 2 for autorepeat.
+
+See :ref:`input-event-codes` for more information about various even codes.