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, 216 insertions, 0 deletions

diff --git a/Documentation/admin-guide/media/faq.rst b/Documentation/admin-guide/media/faq.rst
new file mode 100644
index 000000000..b63548b6f
--- /dev/null
+++ b/Documentation/admin-guide/media/faq.rst
@@ -0,0 +1,216 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+FAQ
+===
+
+.. note::
+
+     1. With Digital TV, a single physical channel may have different
+	contents inside it. The specs call each one as a *service*.
+	This is what a TV user would call "channel". So, in order to
+	avoid confusion, we're calling *transponders* as the physical
+	channel on this FAQ, and *services* for the logical channel.
+     2. The LinuxTV community maintains some Wiki pages with contain
+        a lot of information related to the media subsystem. If you
+        don't find an answer for your needs here, it is likely that
+        you'll be able to get something useful there. It is hosted
+	at:
+
+	https://www.linuxtv.org/wiki/
+
+Some very frequently asked questions about Linux Digital TV support
+
+1. The signal seems to die a few seconds after tuning.
+
+	It's not a bug, it's a feature. Because the frontends have
+	significant power requirements (and hence get very hot), they
+	are powered down if they are unused (i.e. if the frontend device
+	is closed). The ``dvb-core`` module parameter ``dvb_shutdown_timeout``
+	allow you to change the timeout (default 5 seconds). Setting the
+	timeout to 0 disables the timeout feature.
+
+2. How can I watch TV?
+
+	Together with the Linux Kernel, the Digital TV developers support
+	some simple utilities which are mainly intended for testing
+	and to demonstrate how the DVB API works. This is called DVB v5
+	tools and are grouped together with the ``v4l-utils`` git repository:
+
+	    https://git.linuxtv.org/v4l-utils.git/
+
+	You can find more information at the LinuxTV wiki:
+
+	    https://www.linuxtv.org/wiki/index.php/DVBv5_Tools
+
+	The first step is to get a list of services that are transmitted.
+
+	This is done by using several existing tools. You can use
+	for example the ``dvbv5-scan`` tool. You can find more information
+	about it at:
+
+	    https://www.linuxtv.org/wiki/index.php/Dvbv5-scan
+
+	There are some other applications like ``w_scan`` [#]_ that do a
+	blind scan, trying hard to find all possible channels, but
+	those consumes a large amount of time to run.
+
+	.. [#] https://www.linuxtv.org/wiki/index.php/W_scan
+
+	Also, some applications like ``kaffeine`` have their own code
+	to scan for services. So, you don't need to use an external
+	application to obtain such list.
+
+	Most of such tools need a file containing a list of channel
+	transponders available on your area. So, LinuxTV developers
+	maintain tables of Digital TV channel transponders, receiving
+	patches from the community to keep them updated.
+
+	This list is hosted at:
+
+	    https://git.linuxtv.org/dtv-scan-tables.git
+
+	And packaged on several distributions.
+
+	Kaffeine has some blind scan support for some terrestrial standards.
+	It also relies on DTV scan tables, although it contains a copy
+	of it internally (and, if requested by the user, it will download
+	newer versions of it).
+
+	If you are lucky you can just use one of the supplied channel
+	transponders. If not, you may need to seek for such info at
+	the Internet and create a new file. There are several sites with
+	contains physical channel lists. For cable and satellite, usually
+	knowing how to tune into a single channel is enough for the
+	scanning tool to identify the other channels. On some places,
+	this could also work for terrestrial transmissions.
+
+	Once you have a transponders list, you need to generate a services
+	list with a tool like ``dvbv5-scan``.
+
+	Almost all modern Digital TV cards don't have built-in hardware
+	MPEG-decoders. So, it is up to the application to get a MPEG-TS
+	stream provided by the board, split it into audio, video and other
+	data and decode.
+
+3. Which Digital TV applications exist?
+
+	Several media player applications are capable of tuning into
+	digital TV channels, including Kaffeine, Vlc, mplayer and MythTV.
+
+	Kaffeine aims to be very user-friendly, and it is maintained
+	by one of the Kernel driver developers.
+
+	A comprehensive list of those and other apps can be found at:
+
+	    https://www.linuxtv.org/wiki/index.php/TV_Related_Software
+
+	Some of the most popular ones are linked below:
+
+	https://kde.org/applications/multimedia/org.kde.kaffeine
+		KDE media player, focused on Digital TV support
+
+	https://www.linuxtv.org/vdrwiki/index.php/Main_Page
+		Klaus Schmidinger's Video Disk Recorder
+
+	https://linuxtv.org/downloads and https://git.linuxtv.org/
+		Digital TV and other media-related applications and
+		Kernel drivers. The ``v4l-utils`` package there contains
+		several swiss knife tools for using with Digital TV.
+
+	http://sourceforge.net/projects/dvbtools/
+		Dave Chapman's dvbtools package, including
+		dvbstream and dvbtune
+
+	http://www.dbox2.info/
+		LinuxDVB on the dBox2
+
+	http://www.tuxbox.org/
+		the TuxBox CVS many interesting DVB applications and the dBox2
+		DVB source
+
+	http://www.nenie.org/misc/mpsys/
+		MPSYS: a MPEG2 system library and tools
+
+	https://www.videolan.org/vlc/index.pt.html
+		Vlc
+
+	http://mplayerhq.hu/
+		MPlayer
+
+	http://xine.sourceforge.net/ and http://xinehq.de/
+		Xine
+
+	http://www.mythtv.org/
+		MythTV - analog TV and digital TV PVR
+
+	http://dvbsnoop.sourceforge.net/
+		DVB sniffer program to monitor, analyze, debug, dump
+		or view dvb/mpeg/dsm-cc/mhp stream information (TS,
+		PES, SECTION)
+
+4. Can't get a signal tuned correctly
+
+	That could be due to a lot of problems. On my personal experience,
+	usually TV cards need stronger signals than TV sets, and are more
+	sensitive to noise. So, perhaps you just need a better antenna or
+	cabling. Yet, it could also be some hardware or driver issue.
+
+	For example, if you are using a Technotrend/Hauppauge DVB-C card
+	*without* analog module, you might have to use module parameter
+	adac=-1 (dvb-ttpci.o).
+
+	Please see the FAQ page at linuxtv.org, as it could contain some
+	valuable information:
+
+	    https://www.linuxtv.org/wiki/index.php/FAQ_%26_Troubleshooting
+
+	If that doesn't work, check at the linux-media ML archives, to
+	see if someone else had a similar problem with your hardware
+	and/or digital TV service provider:
+
+	    https://lore.kernel.org/linux-media/
+
+	If none of this works, you can try sending an e-mail to the
+	linux-media ML and see if someone else could shed some light.
+	The e-mail is linux-media AT vger.kernel.org.
+
+5. The dvb_net device doesn't give me any packets at all
+
+	Run ``tcpdump`` on the ``dvb0_0`` interface. This sets the interface
+	into promiscuous mode so it accepts any packets from the PID
+	you have configured with the ``dvbnet`` utility. Check if there
+	are any packets with the IP addr and MAC addr you have
+	configured with ``ifconfig`` or with ``ip addr``.
+
+	If ``tcpdump`` doesn't give you any output, check the statistics
+	which ``ifconfig`` or ``netstat -ni`` outputs. (Note: If the MAC
+	address is wrong, ``dvb_net`` won't get any input; thus you have to
+	run ``tcpdump`` before checking the statistics.) If there are no
+	packets at all then maybe the PID is wrong. If there are error packets,
+	then either the PID is wrong or the stream does not conform to
+	the MPE standard (EN 301 192, http://www.etsi.org/). You can
+	use e.g. ``dvbsnoop`` for debugging.
+
+6. The ``dvb_net`` device doesn't give me any multicast packets
+
+	Check your routes if they include the multicast address range.
+	Additionally make sure that "source validation by reversed path
+	lookup" is disabled::
+
+	  $ "echo 0 > /proc/sys/net/ipv4/conf/dvb0/rp_filter"
+
+7. What are all those modules that need to be loaded?
+
+	In order to make it more flexible and support different hardware
+	combinations, the media subsystem is written on a modular way.
+
+	So, besides the Digital TV hardware module for the main chipset,
+	it also needs to load a frontend driver, plus the Digital TV
+	core. If the board also has remote controller, it will also
+	need the remote controller core and the remote controller tables.
+	The same happens if the board has support for analog TV: the
+	core support for video4linux need to be loaded.
+
+	The actual module names are Linux-kernel version specific, as,
+	from time to time, things change, in order to make the media
+	support more flexible.