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, 348 insertions, 0 deletions

diff --git a/Documentation/filesystems/caching/fscache.rst b/Documentation/filesystems/caching/fscache.rst
new file mode 100644
index 000000000..a74d7b052
--- /dev/null
+++ b/Documentation/filesystems/caching/fscache.rst
@@ -0,0 +1,348 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========================
+General Filesystem Caching
+==========================
+
+Overview
+========
+
+This facility is a general purpose cache for network filesystems, though it
+could be used for caching other things such as ISO9660 filesystems too.
+
+FS-Cache mediates between cache backends (such as CacheFiles) and network
+filesystems::
+
+	+---------+
+	|         |                                    +--------------+
+	|   NFS   |--+                                 |              |
+	|         |  |                             +-->|   CacheFS    |
+	+---------+  |               +----------+  |   |  /dev/hda5   |
+	             |               |          |  |   +--------------+
+	+---------+  +-------------->|          |  |
+	|         |      +-------+   |          |--+
+	|   AFS   |----->|       |   | FS-Cache |
+	|         |      | netfs |-->|          |--+
+	+---------+  +-->|  lib  |   |          |  |
+	             |   |       |   |          |  |   +--------------+
+	+---------+  |   +-------+   +----------+  |   |              |
+	|         |  |                             +-->|  CacheFiles  |
+	|   9P    |--+                                 |  /var/cache  |
+	|         |                                    +--------------+
+	+---------+
+
+Or to look at it another way, FS-Cache is a module that provides a caching
+facility to a network filesystem such that the cache is transparent to the
+user::
+
+	+---------+
+	|         |
+	| Server  |
+	|         |
+	+---------+
+	     |                  NETWORK
+	~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	     |
+	     |           +----------+
+	     V           |          |
+	+---------+      |          |
+	|         |      |          |
+	|   NFS   |----->| FS-Cache |
+	|         |      |          |--+
+	+---------+      |          |  |   +--------------+   +--------------+
+	     |           |          |  |   |              |   |              |
+	     V           +----------+  +-->|  CacheFiles  |-->|  Ext3        |
+	+---------+                        |  /var/cache  |   |  /dev/sda6   |
+	|         |                        +--------------+   +--------------+
+	|   VFS   |                                ^                     ^
+	|         |                                |                     |
+	+---------+                                +--------------+      |
+	     |                  KERNEL SPACE                      |      |
+	~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~|~~~~
+	     |                  USER SPACE                        |      |
+	     V                                                    |      |
+	+---------+                                           +--------------+
+	|         |                                           |              |
+	| Process |                                           | cachefilesd  |
+	|         |                                           |              |
+	+---------+                                           +--------------+
+
+
+FS-Cache does not follow the idea of completely loading every netfs file
+opened in its entirety into a cache before permitting it to be accessed and
+then serving the pages out of that cache rather than the netfs inode because:
+
+ (1) It must be practical to operate without a cache.
+
+ (2) The size of any accessible file must not be limited to the size of the
+     cache.
+
+ (3) The combined size of all opened files (this includes mapped libraries)
+     must not be limited to the size of the cache.
+
+ (4) The user should not be forced to download an entire file just to do a
+     one-off access of a small portion of it (such as might be done with the
+     "file" program).
+
+It instead serves the cache out in chunks as and when requested by the netfs
+using it.
+
+
+FS-Cache provides the following facilities:
+
+   * More than one cache can be used at once.  Caches can be selected
+     explicitly by use of tags.
+
+   * Caches can be added / removed at any time, even whilst being accessed.
+
+   * The netfs is provided with an interface that allows either party to
+     withdraw caching facilities from a file (required for (2)).
+
+   * The interface to the netfs returns as few errors as possible, preferring
+     rather to let the netfs remain oblivious.
+
+   * There are three types of cookie: cache, volume and data file cookies.
+     Cache cookies represent the cache as a whole and are not normally visible
+     to the netfs; the netfs gets a volume cookie to represent a collection of
+     files (typically something that a netfs would get for a superblock); and
+     data file cookies are used to cache data (something that would be got for
+     an inode).
+
+   * Volumes are matched using a key.  This is a printable string that is used
+     to encode all the information that might be needed to distinguish one
+     superblock, say, from another.  This would be a compound of things like
+     cell name or server address, volume name or share path.  It must be a
+     valid pathname.
+
+   * Cookies are matched using a key.  This is a binary blob and is used to
+     represent the object within a volume (so the volume key need not form
+     part of the blob).  This might include things like an inode number and
+     uniquifier or a file handle.
+
+   * Cookie resources are set up and pinned by marking the cookie in-use.
+     This prevents the backing resources from being culled.  Timed garbage
+     collection is employed to eliminate cookies that haven't been used for a
+     short while, thereby reducing resource overload.  This is intended to be
+     used when a file is opened or closed.
+
+     A cookie can be marked in-use multiple times simultaneously; each mark
+     must be unused.
+
+   * Begin/end access functions are provided to delay cache withdrawal for the
+     duration of an operation and prevent structs from being freed whilst
+     we're looking at them.
+
+   * Data I/O is done by asynchronous DIO to/from a buffer described by the
+     netfs using an iov_iter.
+
+   * An invalidation facility is available to discard data from the cache and
+     to deal with I/O that's in progress that is accessing old data.
+
+   * Cookies can be "retired" upon release, thereby causing the object to be
+     removed from the cache.
+
+
+The netfs API to FS-Cache can be found in:
+
+	Documentation/filesystems/caching/netfs-api.rst
+
+The cache backend API to FS-Cache can be found in:
+
+	Documentation/filesystems/caching/backend-api.rst
+
+
+Statistical Information
+=======================
+
+If FS-Cache is compiled with the following options enabled::
+
+	CONFIG_FSCACHE_STATS=y
+
+then it will gather certain statistics and display them through:
+
+	/proc/fs/fscache/stats
+
+This shows counts of a number of events that can happen in FS-Cache:
+
++--------------+-------+-------------------------------------------------------+
+|CLASS         |EVENT  |MEANING                                                |
++==============+=======+=======================================================+
+|Cookies       |n=N    |Number of data storage cookies allocated               |
++              +-------+-------------------------------------------------------+
+|              |v=N    |Number of volume index cookies allocated               |
++              +-------+-------------------------------------------------------+
+|              |vcol=N |Number of volume index key collisions                  |
++              +-------+-------------------------------------------------------+
+|              |voom=N |Number of OOM events when allocating volume cookies    |
++--------------+-------+-------------------------------------------------------+
+|Acquire       |n=N    |Number of acquire cookie requests seen                 |
++              +-------+-------------------------------------------------------+
+|              |ok=N   |Number of acq reqs succeeded                           |
++              +-------+-------------------------------------------------------+
+|              |oom=N  |Number of acq reqs failed on ENOMEM                    |
++--------------+-------+-------------------------------------------------------+
+|LRU           |n=N    |Number of cookies currently on the LRU                 |
++              +-------+-------------------------------------------------------+
+|              |exp=N  |Number of cookies expired off of the LRU               |
++              +-------+-------------------------------------------------------+
+|              |rmv=N  |Number of cookies removed from the LRU                 |
++              +-------+-------------------------------------------------------+
+|              |drp=N  |Number of LRU'd cookies relinquished/withdrawn         |
++              +-------+-------------------------------------------------------+
+|              |at=N   |Time till next LRU cull (jiffies)                      |
++--------------+-------+-------------------------------------------------------+
+|Invals        |n=N    |Number of invalidations                                |
++--------------+-------+-------------------------------------------------------+
+|Updates       |n=N    |Number of update cookie requests seen                  |
++              +-------+-------------------------------------------------------+
+|              |rsz=N  |Number of resize requests                              |
++              +-------+-------------------------------------------------------+
+|              |rsn=N  |Number of skipped resize requests                      |
++--------------+-------+-------------------------------------------------------+
+|Relinqs       |n=N    |Number of relinquish cookie requests seen              |
++              +-------+-------------------------------------------------------+
+|              |rtr=N  |Number of rlq reqs with retire=true                    |
++              +-------+-------------------------------------------------------+
+|              |drop=N |Number of cookies no longer blocking re-acquisition    |
++--------------+-------+-------------------------------------------------------+
+|NoSpace       |nwr=N  |Number of write requests refused due to lack of space  |
++              +-------+-------------------------------------------------------+
+|              |ncr=N  |Number of create requests refused due to lack of space |
++              +-------+-------------------------------------------------------+
+|              |cull=N |Number of objects culled to make space                 |
++--------------+-------+-------------------------------------------------------+
+|IO            |rd=N   |Number of read operations in the cache                 |
++              +-------+-------------------------------------------------------+
+|              |wr=N   |Number of write operations in the cache                |
++--------------+-------+-------------------------------------------------------+
+
+Netfslib will also add some stats counters of its own.
+
+
+Cache List
+==========
+
+FS-Cache provides a list of cache cookies:
+
+	/proc/fs/fscache/cookies
+
+This will look something like::
+
+	# cat /proc/fs/fscache/caches
+	CACHE    REF   VOLS  OBJS  ACCES S NAME
+	======== ===== ===== ===== ===== = ===============
+	00000001     2     1  2123     1 A default
+
+where the columns are:
+
+	=======	===============================================================
+	COLUMN	DESCRIPTION
+	=======	===============================================================
+	CACHE	Cache cookie debug ID (also appears in traces)
+	REF	Number of references on the cache cookie
+	VOLS	Number of volumes cookies in this cache
+	OBJS	Number of cache objects in use
+	ACCES	Number of accesses pinning the cache
+	S	State
+	NAME	Name of the cache.
+	=======	===============================================================
+
+The state can be (-) Inactive, (P)reparing, (A)ctive, (E)rror or (W)ithdrawing.
+
+
+Volume List
+===========
+
+FS-Cache provides a list of volume cookies:
+
+	/proc/fs/fscache/volumes
+
+This will look something like::
+
+	VOLUME   REF   nCOOK ACC FL CACHE           KEY
+	======== ===== ===== === == =============== ================
+	00000001    55    54   1 00 default         afs,example.com,100058
+
+where the columns are:
+
+	=======	===============================================================
+	COLUMN	DESCRIPTION
+	=======	===============================================================
+	VOLUME	The volume cookie debug ID (also appears in traces)
+	REF	Number of references on the volume cookie
+	nCOOK	Number of cookies in the volume
+	ACC	Number of accesses pinning the cache
+	FL	Flags on the volume cookie
+	CACHE	Name of the cache or "-"
+	KEY	The indexing key for the volume
+	=======	===============================================================
+
+
+Cookie List
+===========
+
+FS-Cache provides a list of cookies:
+
+	/proc/fs/fscache/cookies
+
+This will look something like::
+
+	# head /proc/fs/fscache/cookies
+	COOKIE   VOLUME   REF ACT ACC S FL DEF
+	======== ======== === === === = == ================
+	00000435 00000001   1   0  -1 - 08 0000000201d080070000000000000000, 0000000000000000
+	00000436 00000001   1   0  -1 - 00 0000005601d080080000000000000000, 0000000000000051
+	00000437 00000001   1   0  -1 - 08 00023b3001d0823f0000000000000000, 0000000000000000
+	00000438 00000001   1   0  -1 - 08 0000005801d0807b0000000000000000, 0000000000000000
+	00000439 00000001   1   0  -1 - 08 00023b3201d080a10000000000000000, 0000000000000000
+	0000043a 00000001   1   0  -1 - 08 00023b3401d080a30000000000000000, 0000000000000000
+	0000043b 00000001   1   0  -1 - 08 00023b3601d080b30000000000000000, 0000000000000000
+	0000043c 00000001   1   0  -1 - 08 00023b3801d080b40000000000000000, 0000000000000000
+
+where the columns are:
+
+	=======	===============================================================
+	COLUMN	DESCRIPTION
+	=======	===============================================================
+	COOKIE	The cookie debug ID (also appears in traces)
+	VOLUME	The parent volume cookie debug ID
+	REF	Number of references on the volume cookie
+	ACT	Number of times the cookie is marked for in use
+	ACC	Number of access pins in the cookie
+	S	State of the cookie
+	FL	Flags on the cookie
+	DEF	Key, auxiliary data
+	=======	===============================================================
+
+
+Debugging
+=========
+
+If CONFIG_FSCACHE_DEBUG is enabled, the FS-Cache facility can have runtime
+debugging enabled by adjusting the value in::
+
+	/sys/module/fscache/parameters/debug
+
+This is a bitmask of debugging streams to enable:
+
+	=======	=======	===============================	=======================
+	BIT	VALUE	STREAM				POINT
+	=======	=======	===============================	=======================
+	0	1	Cache management		Function entry trace
+	1	2					Function exit trace
+	2	4					General
+	3	8	Cookie management		Function entry trace
+	4	16					Function exit trace
+	5	32					General
+	6-8						(Not used)
+	9	512	I/O operation management	Function entry trace
+	10	1024					Function exit trace
+	11	2048					General
+	=======	=======	===============================	=======================
+
+The appropriate set of values should be OR'd together and the result written to
+the control file.  For example::
+
+	echo $((1|8|512)) >/sys/module/fscache/parameters/debug
+
+will turn on all function entry debugging.