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, 218 insertions, 0 deletions

diff --git a/tools/perf/Documentation/perf-arm-spe.txt b/tools/perf/Documentation/perf-arm-spe.txt
new file mode 100644
index 000000000..bf03222e9
--- /dev/null
+++ b/tools/perf/Documentation/perf-arm-spe.txt
@@ -0,0 +1,218 @@
+perf-arm-spe(1)
+================
+
+NAME
+----
+perf-arm-spe - Support for Arm Statistical Profiling Extension within Perf tools
+
+SYNOPSIS
+--------
+[verse]
+'perf record' -e arm_spe//
+
+DESCRIPTION
+-----------
+
+The SPE (Statistical Profiling Extension) feature provides accurate attribution of latencies and
+ events down to individual instructions. Rather than being interrupt-driven, it picks an
+instruction to sample and then captures data for it during execution. Data includes execution time
+in cycles. For loads and stores it also includes data address, cache miss events, and data origin.
+
+The sampling has 5 stages:
+
+  1. Choose an operation
+  2. Collect data about the operation
+  3. Optionally discard the record based on a filter
+  4. Write the record to memory
+  5. Interrupt when the buffer is full
+
+Choose an operation
+~~~~~~~~~~~~~~~~~~~
+
+This is chosen from a sample population, for SPE this is an IMPLEMENTATION DEFINED choice of all
+architectural instructions or all micro-ops. Sampling happens at a programmable interval. The
+architecture provides a mechanism for the SPE driver to infer the minimum interval at which it should
+sample. This minimum interval is used by the driver if no interval is specified. A pseudo-random
+perturbation is also added to the sampling interval by default.
+
+Collect data about the operation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Program counter, PMU events, timings and data addresses related to the operation are recorded.
+Sampling ensures there is only one sampled operation is in flight.
+
+Optionally discard the record based on a filter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Based on programmable criteria, choose whether to keep the record or discard it. If the record is
+discarded then the flow stops here for this sample.
+
+Write the record to memory
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The record is appended to a memory buffer
+
+Interrupt when the buffer is full
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When the buffer fills, an interrupt is sent and the driver signals Perf to collect the records.
+Perf saves the raw data in the perf.data file.
+
+Opening the file
+----------------
+
+Up until this point no decoding of the SPE data was done by either the kernel or Perf. Only when the
+recorded file is opened with 'perf report' or 'perf script' does the decoding happen. When decoding
+the data, Perf generates "synthetic samples" as if these were generated at the time of the
+recording. These samples are the same as if normal sampling was done by Perf without using SPE,
+although they may have more attributes associated with them. For example a normal sample may have
+just the instruction pointer, but an SPE sample can have data addresses and latency attributes.
+
+Why Sampling?
+-------------
+
+ - Sampling, rather than tracing, cuts down the profiling problem to something more manageable for
+ hardware. Only one sampled operation is in flight at a time.
+
+ - Allows precise attribution data, including: Full PC of instruction, data virtual and physical
+ addresses.
+
+ - Allows correlation between an instruction and events, such as TLB and cache miss. (Data source
+ indicates which particular cache was hit, but the meaning is implementation defined because
+ different implementations can have different cache configurations.)
+
+However, SPE does not provide any call-graph information, and relies on statistical methods.
+
+Collisions
+----------
+
+When an operation is sampled while a previous sampled operation has not finished, a collision
+occurs. The new sample is dropped. Collisions affect the integrity of the data, so the sample rate
+should be set to avoid collisions.
+
+The 'sample_collision' PMU event can be used to determine the number of lost samples. Although this
+count is based on collisions _before_ filtering occurs. Therefore this can not be used as an exact
+number for samples dropped that would have made it through the filter, but can be a rough
+guide.
+
+The effect of microarchitectural sampling
+-----------------------------------------
+
+If an implementation samples micro-operations instead of instructions, the results of sampling must
+be weighted accordingly.
+
+For example, if a given instruction A is always converted into two micro-operations, A0 and A1, it
+becomes twice as likely to appear in the sample population.
+
+The coarse effect of conversions, and, if applicable, sampling of speculative operations, can be
+estimated from the 'sample_pop' and 'inst_retired' PMU events.
+
+Kernel Requirements
+-------------------
+
+The ARM_SPE_PMU config must be set to build as either a module or statically.
+
+Depending on CPU model, the kernel may need to be booted with page table isolation disabled
+(kpti=off). If KPTI needs to be disabled, this will fail with a console message "profiling buffer
+inaccessible. Try passing 'kpti=off' on the kernel command line".
+
+Capturing SPE with perf command-line tools
+------------------------------------------
+
+You can record a session with SPE samples:
+
+  perf record -e arm_spe// -- ./mybench
+
+The sample period is set from the -c option, and because the minimum interval is used by default
+it's recommended to set this to a higher value. The value is written to PMSIRR.INTERVAL.
+
+Config parameters
+~~~~~~~~~~~~~~~~~
+
+These are placed between the // in the event and comma separated. For example '-e
+arm_spe/load_filter=1,min_latency=10/'
+
+  branch_filter=1     - collect branches only (PMSFCR.B)
+  event_filter=<mask> - filter on specific events (PMSEVFR) - see bitfield description below
+  jitter=1            - use jitter to avoid resonance when sampling (PMSIRR.RND)
+  load_filter=1       - collect loads only (PMSFCR.LD)
+  min_latency=<n>     - collect only samples with this latency or higher* (PMSLATFR)
+  pa_enable=1         - collect physical address (as well as VA) of loads/stores (PMSCR.PA) - requires privilege
+  pct_enable=1        - collect physical timestamp instead of virtual timestamp (PMSCR.PCT) - requires privilege
+  store_filter=1      - collect stores only (PMSFCR.ST)
+  ts_enable=1         - enable timestamping with value of generic timer (PMSCR.TS)
+
++++*+++ Latency is the total latency from the point at which sampling started on that instruction, rather
+than only the execution latency.
+
+Only some events can be filtered on; these include:
+
+  bit 1     - instruction retired (i.e. omit speculative instructions)
+  bit 3     - L1D refill
+  bit 5     - TLB refill
+  bit 7     - mispredict
+  bit 11    - misaligned access
+
+So to sample just retired instructions:
+
+  perf record -e arm_spe/event_filter=2/ -- ./mybench
+
+or just mispredicted branches:
+
+  perf record -e arm_spe/event_filter=0x80/ -- ./mybench
+
+Viewing the data
+~~~~~~~~~~~~~~~~~
+
+By default perf report and perf script will assign samples to separate groups depending on the
+attributes/events of the SPE record. Because instructions can have multiple events associated with
+them, the samples in these groups are not necessarily unique. For example perf report shows these
+groups:
+
+  Available samples
+  0 arm_spe//
+  0 dummy:u
+  21 l1d-miss
+  897 l1d-access
+  5 llc-miss
+  7 llc-access
+  2 tlb-miss
+  1K tlb-access
+  36 branch-miss
+  0 remote-access
+  900 memory
+
+The arm_spe// and dummy:u events are implementation details and are expected to be empty.
+
+To get a full list of unique samples that are not sorted into groups, set the itrace option to
+generate 'instruction' samples. The period option is also taken into account, so set it to 1
+instruction unless you want to further downsample the already sampled SPE data:
+
+  perf report --itrace=i1i
+
+Memory access details are also stored on the samples and this can be viewed with:
+
+  perf report --mem-mode
+
+Common errors
+~~~~~~~~~~~~~
+
+ - "Cannot find PMU `arm_spe'. Missing kernel support?"
+
+   Module not built or loaded, KPTI not disabled (see above), or running on a VM
+
+ - "Arm SPE CONTEXT packets not found in the traces."
+
+   Root privilege is required to collect context packets. But these only increase the accuracy of
+   assigning PIDs to kernel samples. For userspace sampling this can be ignored.
+
+ - Excessively large perf.data file size
+
+   Increase sampling interval (see above)
+
+
+SEE ALSO
+--------
+
+linkperf:perf-record[1], linkperf:perf-script[1], linkperf:perf-report[1],
+linkperf:perf-inject[1]