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, 383 insertions, 0 deletions

diff --git a/Documentation/driver-api/cxl/memory-devices.rst b/Documentation/driver-api/cxl/memory-devices.rst
new file mode 100644
index 000000000..5149ecdc5
--- /dev/null
+++ b/Documentation/driver-api/cxl/memory-devices.rst
@@ -0,0 +1,383 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+===================================
+Compute Express Link Memory Devices
+===================================
+
+A Compute Express Link Memory Device is a CXL component that implements the
+CXL.mem protocol. It contains some amount of volatile memory, persistent memory,
+or both. It is enumerated as a PCI device for configuration and passing
+messages over an MMIO mailbox. Its contribution to the System Physical
+Address space is handled via HDM (Host Managed Device Memory) decoders
+that optionally define a device's contribution to an interleaved address
+range across multiple devices underneath a host-bridge or interleaved
+across host-bridges.
+
+CXL Bus: Theory of Operation
+============================
+Similar to how a RAID driver takes disk objects and assembles them into a new
+logical device, the CXL subsystem is tasked to take PCIe and ACPI objects and
+assemble them into a CXL.mem decode topology. The need for runtime configuration
+of the CXL.mem topology is also similar to RAID in that different environments
+with the same hardware configuration may decide to assemble the topology in
+contrasting ways. One may choose performance (RAID0) striping memory across
+multiple Host Bridges and endpoints while another may opt for fault tolerance
+and disable any striping in the CXL.mem topology.
+
+Platform firmware enumerates a menu of interleave options at the "CXL root port"
+(Linux term for the top of the CXL decode topology). From there, PCIe topology
+dictates which endpoints can participate in which Host Bridge decode regimes.
+Each PCIe Switch in the path between the root and an endpoint introduces a point
+at which the interleave can be split. For example platform firmware may say at a
+given range only decodes to 1 one Host Bridge, but that Host Bridge may in turn
+interleave cycles across multiple Root Ports. An intervening Switch between a
+port and an endpoint may interleave cycles across multiple Downstream Switch
+Ports, etc.
+
+Here is a sample listing of a CXL topology defined by 'cxl_test'. The 'cxl_test'
+module generates an emulated CXL topology of 2 Host Bridges each with 2 Root
+Ports. Each of those Root Ports are connected to 2-way switches with endpoints
+connected to those downstream ports for a total of 8 endpoints::
+
+    # cxl list -BEMPu -b cxl_test
+    {
+      "bus":"root3",
+      "provider":"cxl_test",
+      "ports:root3":[
+        {
+          "port":"port5",
+          "host":"cxl_host_bridge.1",
+          "ports:port5":[
+            {
+              "port":"port8",
+              "host":"cxl_switch_uport.1",
+              "endpoints:port8":[
+                {
+                  "endpoint":"endpoint9",
+                  "host":"mem2",
+                  "memdev":{
+                    "memdev":"mem2",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x1",
+                    "numa_node":1,
+                    "host":"cxl_mem.1"
+                  }
+                },
+                {
+                  "endpoint":"endpoint15",
+                  "host":"mem6",
+                  "memdev":{
+                    "memdev":"mem6",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x5",
+                    "numa_node":1,
+                    "host":"cxl_mem.5"
+                  }
+                }
+              ]
+            },
+            {
+              "port":"port12",
+              "host":"cxl_switch_uport.3",
+              "endpoints:port12":[
+                {
+                  "endpoint":"endpoint17",
+                  "host":"mem8",
+                  "memdev":{
+                    "memdev":"mem8",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x7",
+                    "numa_node":1,
+                    "host":"cxl_mem.7"
+                  }
+                },
+                {
+                  "endpoint":"endpoint13",
+                  "host":"mem4",
+                  "memdev":{
+                    "memdev":"mem4",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x3",
+                    "numa_node":1,
+                    "host":"cxl_mem.3"
+                  }
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "port":"port4",
+          "host":"cxl_host_bridge.0",
+          "ports:port4":[
+            {
+              "port":"port6",
+              "host":"cxl_switch_uport.0",
+              "endpoints:port6":[
+                {
+                  "endpoint":"endpoint7",
+                  "host":"mem1",
+                  "memdev":{
+                    "memdev":"mem1",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0",
+                    "numa_node":0,
+                    "host":"cxl_mem.0"
+                  }
+                },
+                {
+                  "endpoint":"endpoint14",
+                  "host":"mem5",
+                  "memdev":{
+                    "memdev":"mem5",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x4",
+                    "numa_node":0,
+                    "host":"cxl_mem.4"
+                  }
+                }
+              ]
+            },
+            {
+              "port":"port10",
+              "host":"cxl_switch_uport.2",
+              "endpoints:port10":[
+                {
+                  "endpoint":"endpoint16",
+                  "host":"mem7",
+                  "memdev":{
+                    "memdev":"mem7",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x6",
+                    "numa_node":0,
+                    "host":"cxl_mem.6"
+                  }
+                },
+                {
+                  "endpoint":"endpoint11",
+                  "host":"mem3",
+                  "memdev":{
+                    "memdev":"mem3",
+                    "pmem_size":"256.00 MiB (268.44 MB)",
+                    "ram_size":"256.00 MiB (268.44 MB)",
+                    "serial":"0x2",
+                    "numa_node":0,
+                    "host":"cxl_mem.2"
+                  }
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    }
+
+In that listing each "root", "port", and "endpoint" object correspond a kernel
+'struct cxl_port' object. A 'cxl_port' is a device that can decode CXL.mem to
+its descendants. So "root" claims non-PCIe enumerable platform decode ranges and
+decodes them to "ports", "ports" decode to "endpoints", and "endpoints"
+represent the decode from SPA (System Physical Address) to DPA (Device Physical
+Address).
+
+Continuing the RAID analogy, disks have both topology metadata and on device
+metadata that determine RAID set assembly. CXL Port topology and CXL Port link
+status is metadata for CXL.mem set assembly. The CXL Port topology is enumerated
+by the arrival of a CXL.mem device. I.e. unless and until the PCIe core attaches
+the cxl_pci driver to a CXL Memory Expander there is no role for CXL Port
+objects. Conversely for hot-unplug / removal scenarios, there is no need for
+the Linux PCI core to tear down switch-level CXL resources because the endpoint
+->remove() event cleans up the port data that was established to support that
+Memory Expander.
+
+The port metadata and potential decode schemes that a give memory device may
+participate can be determined via a command like::
+
+    # cxl list -BDMu -d root -m mem3
+    {
+      "bus":"root3",
+      "provider":"cxl_test",
+      "decoders:root3":[
+        {
+          "decoder":"decoder3.1",
+          "resource":"0x8030000000",
+          "size":"512.00 MiB (536.87 MB)",
+          "volatile_capable":true,
+          "nr_targets":2
+        },
+        {
+          "decoder":"decoder3.3",
+          "resource":"0x8060000000",
+          "size":"512.00 MiB (536.87 MB)",
+          "pmem_capable":true,
+          "nr_targets":2
+        },
+        {
+          "decoder":"decoder3.0",
+          "resource":"0x8020000000",
+          "size":"256.00 MiB (268.44 MB)",
+          "volatile_capable":true,
+          "nr_targets":1
+        },
+        {
+          "decoder":"decoder3.2",
+          "resource":"0x8050000000",
+          "size":"256.00 MiB (268.44 MB)",
+          "pmem_capable":true,
+          "nr_targets":1
+        }
+      ],
+      "memdevs:root3":[
+        {
+          "memdev":"mem3",
+          "pmem_size":"256.00 MiB (268.44 MB)",
+          "ram_size":"256.00 MiB (268.44 MB)",
+          "serial":"0x2",
+          "numa_node":0,
+          "host":"cxl_mem.2"
+        }
+      ]
+    }
+
+...which queries the CXL topology to ask "given CXL Memory Expander with a kernel
+device name of 'mem3' which platform level decode ranges may this device
+participate". A given expander can participate in multiple CXL.mem interleave
+sets simultaneously depending on how many decoder resource it has. In this
+example mem3 can participate in one or more of a PMEM interleave that spans to
+Host Bridges, a PMEM interleave that targets a single Host Bridge, a Volatile
+memory interleave that spans 2 Host Bridges, and a Volatile memory interleave
+that only targets a single Host Bridge.
+
+Conversely the memory devices that can participate in a given platform level
+decode scheme can be determined via a command like the following::
+
+    # cxl list -MDu -d 3.2
+    [
+      {
+        "memdevs":[
+          {
+            "memdev":"mem1",
+            "pmem_size":"256.00 MiB (268.44 MB)",
+            "ram_size":"256.00 MiB (268.44 MB)",
+            "serial":"0",
+            "numa_node":0,
+            "host":"cxl_mem.0"
+          },
+          {
+            "memdev":"mem5",
+            "pmem_size":"256.00 MiB (268.44 MB)",
+            "ram_size":"256.00 MiB (268.44 MB)",
+            "serial":"0x4",
+            "numa_node":0,
+            "host":"cxl_mem.4"
+          },
+          {
+            "memdev":"mem7",
+            "pmem_size":"256.00 MiB (268.44 MB)",
+            "ram_size":"256.00 MiB (268.44 MB)",
+            "serial":"0x6",
+            "numa_node":0,
+            "host":"cxl_mem.6"
+          },
+          {
+            "memdev":"mem3",
+            "pmem_size":"256.00 MiB (268.44 MB)",
+            "ram_size":"256.00 MiB (268.44 MB)",
+            "serial":"0x2",
+            "numa_node":0,
+            "host":"cxl_mem.2"
+          }
+        ]
+      },
+      {
+        "root decoders":[
+          {
+            "decoder":"decoder3.2",
+            "resource":"0x8050000000",
+            "size":"256.00 MiB (268.44 MB)",
+            "pmem_capable":true,
+            "nr_targets":1
+          }
+        ]
+      }
+    ]
+
+...where the naming scheme for decoders is "decoder<port_id>.<instance_id>".
+
+Driver Infrastructure
+=====================
+
+This section covers the driver infrastructure for a CXL memory device.
+
+CXL Memory Device
+-----------------
+
+.. kernel-doc:: drivers/cxl/pci.c
+   :doc: cxl pci
+
+.. kernel-doc:: drivers/cxl/pci.c
+   :internal:
+
+.. kernel-doc:: drivers/cxl/mem.c
+   :doc: cxl mem
+
+CXL Port
+--------
+.. kernel-doc:: drivers/cxl/port.c
+   :doc: cxl port
+
+CXL Core
+--------
+.. kernel-doc:: drivers/cxl/cxl.h
+   :doc: cxl objects
+
+.. kernel-doc:: drivers/cxl/cxl.h
+   :internal:
+
+.. kernel-doc:: drivers/cxl/core/port.c
+   :doc: cxl core
+
+.. kernel-doc:: drivers/cxl/core/port.c
+   :identifiers:
+
+.. kernel-doc:: drivers/cxl/core/pci.c
+   :doc: cxl core pci
+
+.. kernel-doc:: drivers/cxl/core/pci.c
+   :identifiers:
+
+.. kernel-doc:: drivers/cxl/core/pmem.c
+   :doc: cxl pmem
+
+.. kernel-doc:: drivers/cxl/core/regs.c
+   :doc: cxl registers
+
+.. kernel-doc:: drivers/cxl/core/mbox.c
+   :doc: cxl mbox
+
+CXL Regions
+-----------
+.. kernel-doc:: drivers/cxl/core/region.c
+   :doc: cxl core region
+
+.. kernel-doc:: drivers/cxl/core/region.c
+   :identifiers:
+
+External Interfaces
+===================
+
+CXL IOCTL Interface
+-------------------
+
+.. kernel-doc:: include/uapi/linux/cxl_mem.h
+   :doc: UAPI
+
+.. kernel-doc:: include/uapi/linux/cxl_mem.h
+   :internal: