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, 286 insertions, 0 deletions

diff --git a/Documentation/admin-guide/parport.rst b/Documentation/admin-guide/parport.rst
new file mode 100644
index 000000000..ad3f9b8a1
--- /dev/null
+++ b/Documentation/admin-guide/parport.rst
@@ -0,0 +1,286 @@
+Parport
++++++++
+
+The ``parport`` code provides parallel-port support under Linux.  This
+includes the ability to share one port between multiple device
+drivers.
+
+You can pass parameters to the ``parport`` code to override its automatic
+detection of your hardware.  This is particularly useful if you want
+to use IRQs, since in general these can't be autoprobed successfully.
+By default IRQs are not used even if they **can** be probed.  This is
+because there are a lot of people using the same IRQ for their
+parallel port and a sound card or network card.
+
+The ``parport`` code is split into two parts: generic (which deals with
+port-sharing) and architecture-dependent (which deals with actually
+using the port).
+
+
+Parport as modules
+==================
+
+If you load the `parport`` code as a module, say::
+
+	# insmod parport
+
+to load the generic ``parport`` code.  You then must load the
+architecture-dependent code with (for example)::
+
+	# insmod parport_pc io=0x3bc,0x378,0x278 irq=none,7,auto
+
+to tell the ``parport`` code that you want three PC-style ports, one at
+0x3bc with no IRQ, one at 0x378 using IRQ 7, and one at 0x278 with an
+auto-detected IRQ.  Currently, PC-style (``parport_pc``), Sun ``bpp``,
+Amiga, Atari, and MFC3 hardware is supported.
+
+PCI parallel I/O card support comes from ``parport_pc``.  Base I/O
+addresses should not be specified for supported PCI cards since they
+are automatically detected.
+
+
+modprobe
+--------
+
+If you use modprobe , you will find it useful to add lines as below to a
+configuration file in /etc/modprobe.d/ directory::
+
+	alias parport_lowlevel parport_pc
+	options parport_pc io=0x378,0x278 irq=7,auto
+
+modprobe will load ``parport_pc`` (with the options ``io=0x378,0x278 irq=7,auto``)
+whenever a parallel port device driver (such as ``lp``) is loaded.
+
+Note that these are example lines only!  You shouldn't in general need
+to specify any options to ``parport_pc`` in order to be able to use a
+parallel port.
+
+
+Parport probe [optional]
+------------------------
+
+In 2.2 kernels there was a module called ``parport_probe``, which was used
+for collecting IEEE 1284 device ID information.  This has now been
+enhanced and now lives with the IEEE 1284 support.  When a parallel
+port is detected, the devices that are connected to it are analysed,
+and information is logged like this::
+
+	parport0: Printer, BJC-210 (Canon)
+
+The probe information is available from files in ``/proc/sys/dev/parport/``.
+
+
+Parport linked into the kernel statically
+=========================================
+
+If you compile the ``parport`` code into the kernel, then you can use
+kernel boot parameters to get the same effect.  Add something like the
+following to your LILO command line::
+
+	parport=0x3bc parport=0x378,7 parport=0x278,auto,nofifo
+
+You can have many ``parport=...`` statements, one for each port you want
+to add.  Adding ``parport=0`` to the kernel command-line will disable
+parport support entirely.  Adding ``parport=auto`` to the kernel
+command-line will make ``parport`` use any IRQ lines or DMA channels that
+it auto-detects.
+
+
+Files in /proc
+==============
+
+If you have configured the ``/proc`` filesystem into your kernel, you will
+see a new directory entry: ``/proc/sys/dev/parport``.  In there will be a
+directory entry for each parallel port for which parport is
+configured.  In each of those directories are a collection of files
+describing that parallel port.
+
+The ``/proc/sys/dev/parport`` directory tree looks like::
+
+	parport
+	|-- default
+	|   |-- spintime
+	|   `-- timeslice
+	|-- parport0
+	|   |-- autoprobe
+	|   |-- autoprobe0
+	|   |-- autoprobe1
+	|   |-- autoprobe2
+	|   |-- autoprobe3
+	|   |-- devices
+	|   |   |-- active
+	|   |   `-- lp
+	|   |       `-- timeslice
+	|   |-- base-addr
+	|   |-- irq
+	|   |-- dma
+	|   |-- modes
+	|   `-- spintime
+	`-- parport1
+	|-- autoprobe
+	|-- autoprobe0
+	|-- autoprobe1
+	|-- autoprobe2
+	|-- autoprobe3
+	|-- devices
+	|   |-- active
+	|   `-- ppa
+	|       `-- timeslice
+	|-- base-addr
+	|-- irq
+	|-- dma
+	|-- modes
+	`-- spintime
+
+.. tabularcolumns:: |p{4.0cm}|p{13.5cm}|
+
+=======================	=======================================================
+File			Contents
+=======================	=======================================================
+``devices/active``	A list of the device drivers using that port.  A "+"
+			will appear by the name of the device currently using
+			the port (it might not appear against any).  The
+			string "none" means that there are no device drivers
+			using that port.
+
+``base-addr``		Parallel port's base address, or addresses if the port
+			has more than one in which case they are separated
+			with tabs.  These values might not have any sensible
+			meaning for some ports.
+
+``irq``			Parallel port's IRQ, or -1 if none is being used.
+
+``dma``			Parallel port's DMA channel, or -1 if none is being
+			used.
+
+``modes``		Parallel port's hardware modes, comma-separated,
+			meaning:
+
+			- PCSPP
+				PC-style SPP registers are available.
+
+			- TRISTATE
+				Port is bidirectional.
+
+			- COMPAT
+				Hardware acceleration for printers is
+				available and will be used.
+
+			- EPP
+				Hardware acceleration for EPP protocol
+				is available and will be used.
+
+			- ECP
+				Hardware acceleration for ECP protocol
+				is available and will be used.
+
+			- DMA
+				DMA is available and will be used.
+
+			Note that the current implementation will only take
+			advantage of COMPAT and ECP modes if it has an IRQ
+			line to use.
+
+``autoprobe``		Any IEEE-1284 device ID information that has been
+			acquired from the (non-IEEE 1284.3) device.
+
+``autoprobe[0-3]``	IEEE 1284 device ID information retrieved from
+			daisy-chain devices that conform to IEEE 1284.3.
+
+``spintime``		The number of microseconds to busy-loop while waiting
+			for the peripheral to respond.  You might find that
+			adjusting this improves performance, depending on your
+			peripherals.  This is a port-wide setting, i.e. it
+			applies to all devices on a particular port.
+
+``timeslice``		The number of milliseconds that a device driver is
+			allowed to keep a port claimed for.  This is advisory,
+			and driver can ignore it if it must.
+
+``default/*``		The defaults for spintime and timeslice. When a new
+			port is	registered, it picks up the default spintime.
+			When a new device is registered, it picks up the
+			default timeslice.
+=======================	=======================================================
+
+Device drivers
+==============
+
+Once the parport code is initialised, you can attach device drivers to
+specific ports.  Normally this happens automatically; if the lp driver
+is loaded it will create one lp device for each port found.  You can
+override this, though, by using parameters either when you load the lp
+driver::
+
+	# insmod lp parport=0,2
+
+or on the LILO command line::
+
+	lp=parport0 lp=parport2
+
+Both the above examples would inform lp that you want ``/dev/lp0`` to be
+the first parallel port, and /dev/lp1 to be the **third** parallel port,
+with no lp device associated with the second port (parport1).  Note
+that this is different to the way older kernels worked; there used to
+be a static association between the I/O port address and the device
+name, so ``/dev/lp0`` was always the port at 0x3bc.  This is no longer the
+case - if you only have one port, it will default to being ``/dev/lp0``,
+regardless of base address.
+
+Also:
+
+ * If you selected the IEEE 1284 support at compile time, you can say
+   ``lp=auto`` on the kernel command line, and lp will create devices
+   only for those ports that seem to have printers attached.
+
+ * If you give PLIP the ``timid`` parameter, either with ``plip=timid`` on
+   the command line, or with ``insmod plip timid=1`` when using modules,
+   it will avoid any ports that seem to be in use by other devices.
+
+ * IRQ autoprobing works only for a few port types at the moment.
+
+Reporting printer problems with parport
+=======================================
+
+If you are having problems printing, please go through these steps to
+try to narrow down where the problem area is.
+
+When reporting problems with parport, really you need to give all of
+the messages that ``parport_pc`` spits out when it initialises.  There are
+several code paths:
+
+- polling
+- interrupt-driven, protocol in software
+- interrupt-driven, protocol in hardware using PIO
+- interrupt-driven, protocol in hardware using DMA
+
+The kernel messages that ``parport_pc`` logs give an indication of which
+code path is being used. (They could be a lot better actually..)
+
+For normal printer protocol, having IEEE 1284 modes enabled or not
+should not make a difference.
+
+To turn off the 'protocol in hardware' code paths, disable
+``CONFIG_PARPORT_PC_FIFO``.  Note that when they are enabled they are not
+necessarily **used**; it depends on whether the hardware is available,
+enabled by the BIOS, and detected by the driver.
+
+So, to start with, disable ``CONFIG_PARPORT_PC_FIFO``, and load ``parport_pc``
+with ``irq=none``. See if printing works then.  It really should,
+because this is the simplest code path.
+
+If that works fine, try with ``io=0x378 irq=7`` (adjust for your
+hardware), to make it use interrupt-driven in-software protocol.
+
+If **that** works fine, then one of the hardware modes isn't working
+right.  Enable ``CONFIG_FIFO`` (no, it isn't a module option,
+and yes, it should be), set the port to ECP mode in the BIOS and note
+the DMA channel, and try with::
+
+    io=0x378 irq=7 dma=none (for PIO)
+    io=0x378 irq=7 dma=3 (for DMA)
+
+----------
+
+philb@gnu.org
+tim@cyberelk.net