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, 379 insertions, 0 deletions

diff --git a/Documentation/driver-api/dmaengine/client.rst b/Documentation/driver-api/dmaengine/client.rst
new file mode 100644
index 000000000..bfd057b21
--- /dev/null
+++ b/Documentation/driver-api/dmaengine/client.rst
@@ -0,0 +1,379 @@
+====================
+DMA Engine API Guide
+====================
+
+Vinod Koul <vinod dot koul at intel.com>
+
+.. note:: For DMA Engine usage in async_tx please see:
+          ``Documentation/crypto/async-tx-api.rst``
+
+
+Below is a guide to device driver writers on how to use the Slave-DMA API of the
+DMA Engine. This is applicable only for slave DMA usage only.
+
+DMA usage
+=========
+
+The slave DMA usage consists of following steps:
+
+- Allocate a DMA slave channel
+
+- Set slave and controller specific parameters
+
+- Get a descriptor for transaction
+
+- Submit the transaction
+
+- Issue pending requests and wait for callback notification
+
+The details of these operations are:
+
+1. Allocate a DMA slave channel
+
+   Channel allocation is slightly different in the slave DMA context,
+   client drivers typically need a channel from a particular DMA
+   controller only and even in some cases a specific channel is desired.
+   To request a channel dma_request_chan() API is used.
+
+   Interface:
+
+   .. code-block:: c
+
+      struct dma_chan *dma_request_chan(struct device *dev, const char *name);
+
+   Which will find and return the ``name`` DMA channel associated with the 'dev'
+   device. The association is done via DT, ACPI or board file based
+   dma_slave_map matching table.
+
+   A channel allocated via this interface is exclusive to the caller,
+   until dma_release_channel() is called.
+
+2. Set slave and controller specific parameters
+
+   Next step is always to pass some specific information to the DMA
+   driver. Most of the generic information which a slave DMA can use
+   is in struct dma_slave_config. This allows the clients to specify
+   DMA direction, DMA addresses, bus widths, DMA burst lengths etc
+   for the peripheral.
+
+   If some DMA controllers have more parameters to be sent then they
+   should try to embed struct dma_slave_config in their controller
+   specific structure. That gives flexibility to client to pass more
+   parameters, if required.
+
+   Interface:
+
+   .. code-block:: c
+
+      int dmaengine_slave_config(struct dma_chan *chan,
+			struct dma_slave_config *config)
+
+   Please see the dma_slave_config structure definition in dmaengine.h
+   for a detailed explanation of the struct members. Please note
+   that the 'direction' member will be going away as it duplicates the
+   direction given in the prepare call.
+
+3. Get a descriptor for transaction
+
+  For slave usage the various modes of slave transfers supported by the
+  DMA-engine are:
+
+  - slave_sg: DMA a list of scatter gather buffers from/to a peripheral
+
+  - dma_cyclic: Perform a cyclic DMA operation from/to a peripheral till the
+    operation is explicitly stopped.
+
+  - interleaved_dma: This is common to Slave as well as M2M clients. For slave
+    address of devices' fifo could be already known to the driver.
+    Various types of operations could be expressed by setting
+    appropriate values to the 'dma_interleaved_template' members. Cyclic
+    interleaved DMA transfers are also possible if supported by the channel by
+    setting the DMA_PREP_REPEAT transfer flag.
+
+  A non-NULL return of this transfer API represents a "descriptor" for
+  the given transaction.
+
+  Interface:
+
+  .. code-block:: c
+
+     struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(
+		struct dma_chan *chan, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_data_direction direction,
+		unsigned long flags);
+
+     struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
+		struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
+		size_t period_len, enum dma_data_direction direction);
+
+     struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
+		struct dma_chan *chan, struct dma_interleaved_template *xt,
+		unsigned long flags);
+
+  The peripheral driver is expected to have mapped the scatterlist for
+  the DMA operation prior to calling dmaengine_prep_slave_sg(), and must
+  keep the scatterlist mapped until the DMA operation has completed.
+  The scatterlist must be mapped using the DMA struct device.
+  If a mapping needs to be synchronized later, dma_sync_*_for_*() must be
+  called using the DMA struct device, too.
+  So, normal setup should look like this:
+
+  .. code-block:: c
+
+     struct device *dma_dev = dmaengine_get_dma_device(chan);
+
+     nr_sg = dma_map_sg(dma_dev, sgl, sg_len);
+	if (nr_sg == 0)
+		/* error */
+
+	desc = dmaengine_prep_slave_sg(chan, sgl, nr_sg, direction, flags);
+
+  Once a descriptor has been obtained, the callback information can be
+  added and the descriptor must then be submitted. Some DMA engine
+  drivers may hold a spinlock between a successful preparation and
+  submission so it is important that these two operations are closely
+  paired.
+
+  .. note::
+
+     Although the async_tx API specifies that completion callback
+     routines cannot submit any new operations, this is not the
+     case for slave/cyclic DMA.
+
+     For slave DMA, the subsequent transaction may not be available
+     for submission prior to callback function being invoked, so
+     slave DMA callbacks are permitted to prepare and submit a new
+     transaction.
+
+     For cyclic DMA, a callback function may wish to terminate the
+     DMA via dmaengine_terminate_async().
+
+     Therefore, it is important that DMA engine drivers drop any
+     locks before calling the callback function which may cause a
+     deadlock.
+
+     Note that callbacks will always be invoked from the DMA
+     engines tasklet, never from interrupt context.
+
+  **Optional: per descriptor metadata**
+
+  DMAengine provides two ways for metadata support.
+
+  DESC_METADATA_CLIENT
+
+    The metadata buffer is allocated/provided by the client driver and it is
+    attached to the descriptor.
+
+  .. code-block:: c
+
+     int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc,
+				   void *data, size_t len);
+
+  DESC_METADATA_ENGINE
+
+    The metadata buffer is allocated/managed by the DMA driver. The client
+    driver can ask for the pointer, maximum size and the currently used size of
+    the metadata and can directly update or read it.
+
+    Becasue the DMA driver manages the memory area containing the metadata,
+    clients must make sure that they do not try to access or get the pointer
+    after their transfer completion callback has run for the descriptor.
+    If no completion callback has been defined for the transfer, then the
+    metadata must not be accessed after issue_pending.
+    In other words: if the aim is to read back metadata after the transfer is
+    completed, then the client must use completion callback.
+
+  .. code-block:: c
+
+     void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc,
+		size_t *payload_len, size_t *max_len);
+
+     int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc,
+		size_t payload_len);
+
+  Client drivers can query if a given mode is supported with:
+
+  .. code-block:: c
+
+     bool dmaengine_is_metadata_mode_supported(struct dma_chan *chan,
+		enum dma_desc_metadata_mode mode);
+
+  Depending on the used mode client drivers must follow different flow.
+
+  DESC_METADATA_CLIENT
+
+    - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
+
+      1. prepare the descriptor (dmaengine_prep_*)
+         construct the metadata in the client's buffer
+      2. use dmaengine_desc_attach_metadata() to attach the buffer to the
+         descriptor
+      3. submit the transfer
+
+    - DMA_DEV_TO_MEM:
+
+      1. prepare the descriptor (dmaengine_prep_*)
+      2. use dmaengine_desc_attach_metadata() to attach the buffer to the
+         descriptor
+      3. submit the transfer
+      4. when the transfer is completed, the metadata should be available in the
+         attached buffer
+
+  DESC_METADATA_ENGINE
+
+    - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
+
+      1. prepare the descriptor (dmaengine_prep_*)
+      2. use dmaengine_desc_get_metadata_ptr() to get the pointer to the
+         engine's metadata area
+      3. update the metadata at the pointer
+      4. use dmaengine_desc_set_metadata_len()  to tell the DMA engine the
+         amount of data the client has placed into the metadata buffer
+      5. submit the transfer
+
+    - DMA_DEV_TO_MEM:
+
+      1. prepare the descriptor (dmaengine_prep_*)
+      2. submit the transfer
+      3. on transfer completion, use dmaengine_desc_get_metadata_ptr() to get
+         the pointer to the engine's metadata area
+      4. read out the metadata from the pointer
+
+  .. note::
+
+     When DESC_METADATA_ENGINE mode is used the metadata area for the descriptor
+     is no longer valid after the transfer has been completed (valid up to the
+     point when the completion callback returns if used).
+
+     Mixed use of DESC_METADATA_CLIENT / DESC_METADATA_ENGINE is not allowed,
+     client drivers must use either of the modes per descriptor.
+
+4. Submit the transaction
+
+   Once the descriptor has been prepared and the callback information
+   added, it must be placed on the DMA engine drivers pending queue.
+
+   Interface:
+
+   .. code-block:: c
+
+      dma_cookie_t dmaengine_submit(struct dma_async_tx_descriptor *desc)
+
+   This returns a cookie can be used to check the progress of DMA engine
+   activity via other DMA engine calls not covered in this document.
+
+   dmaengine_submit() will not start the DMA operation, it merely adds
+   it to the pending queue. For this, see step 5, dma_async_issue_pending.
+
+   .. note::
+
+      After calling ``dmaengine_submit()`` the submitted transfer descriptor
+      (``struct dma_async_tx_descriptor``) belongs to the DMA engine.
+      Consequently, the client must consider invalid the pointer to that
+      descriptor.
+
+5. Issue pending DMA requests and wait for callback notification
+
+   The transactions in the pending queue can be activated by calling the
+   issue_pending API. If channel is idle then the first transaction in
+   queue is started and subsequent ones queued up.
+
+   On completion of each DMA operation, the next in queue is started and
+   a tasklet triggered. The tasklet will then call the client driver
+   completion callback routine for notification, if set.
+
+   Interface:
+
+   .. code-block:: c
+
+      void dma_async_issue_pending(struct dma_chan *chan);
+
+Further APIs
+------------
+
+1. Terminate APIs
+
+   .. code-block:: c
+
+      int dmaengine_terminate_sync(struct dma_chan *chan)
+      int dmaengine_terminate_async(struct dma_chan *chan)
+      int dmaengine_terminate_all(struct dma_chan *chan) /* DEPRECATED */
+
+   This causes all activity for the DMA channel to be stopped, and may
+   discard data in the DMA FIFO which hasn't been fully transferred.
+   No callback functions will be called for any incomplete transfers.
+
+   Two variants of this function are available.
+
+   dmaengine_terminate_async() might not wait until the DMA has been fully
+   stopped or until any running complete callbacks have finished. But it is
+   possible to call dmaengine_terminate_async() from atomic context or from
+   within a complete callback. dmaengine_synchronize() must be called before it
+   is safe to free the memory accessed by the DMA transfer or free resources
+   accessed from within the complete callback.
+
+   dmaengine_terminate_sync() will wait for the transfer and any running
+   complete callbacks to finish before it returns. But the function must not be
+   called from atomic context or from within a complete callback.
+
+   dmaengine_terminate_all() is deprecated and should not be used in new code.
+
+2. Pause API
+
+   .. code-block:: c
+
+      int dmaengine_pause(struct dma_chan *chan)
+
+   This pauses activity on the DMA channel without data loss.
+
+3. Resume API
+
+   .. code-block:: c
+
+       int dmaengine_resume(struct dma_chan *chan)
+
+   Resume a previously paused DMA channel. It is invalid to resume a
+   channel which is not currently paused.
+
+4. Check Txn complete
+
+   .. code-block:: c
+
+      enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
+		dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used)
+
+   This can be used to check the status of the channel. Please see
+   the documentation in include/linux/dmaengine.h for a more complete
+   description of this API.
+
+   This can be used in conjunction with dma_async_is_complete() and
+   the cookie returned from dmaengine_submit() to check for
+   completion of a specific DMA transaction.
+
+   .. note::
+
+      Not all DMA engine drivers can return reliable information for
+      a running DMA channel. It is recommended that DMA engine users
+      pause or stop (via dmaengine_terminate_all()) the channel before
+      using this API.
+
+5. Synchronize termination API
+
+   .. code-block:: c
+
+      void dmaengine_synchronize(struct dma_chan *chan)
+
+   Synchronize the termination of the DMA channel to the current context.
+
+   This function should be used after dmaengine_terminate_async() to synchronize
+   the termination of the DMA channel to the current context. The function will
+   wait for the transfer and any running complete callbacks to finish before it
+   returns.
+
+   If dmaengine_terminate_async() is used to stop the DMA channel this function
+   must be called before it is safe to free memory accessed by previously
+   submitted descriptors or to free any resources accessed within the complete
+   callback of previously submitted descriptors.
+
+   The behavior of this function is undefined if dma_async_issue_pending() has
+   been called between dmaengine_terminate_async() and this function.