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, 235 insertions, 0 deletions

diff --git a/Documentation/networking/nf_flowtable.rst b/Documentation/networking/nf_flowtable.rst
new file mode 100644
index 000000000..d757c21c1
--- /dev/null
+++ b/Documentation/networking/nf_flowtable.rst
@@ -0,0 +1,235 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====================================
+Netfilter's flowtable infrastructure
+====================================
+
+This documentation describes the Netfilter flowtable infrastructure which allows
+you to define a fastpath through the flowtable datapath. This infrastructure
+also provides hardware offload support. The flowtable supports for the layer 3
+IPv4 and IPv6 and the layer 4 TCP and UDP protocols.
+
+Overview
+--------
+
+Once the first packet of the flow successfully goes through the IP forwarding
+path, from the second packet on, you might decide to offload the flow to the
+flowtable through your ruleset. The flowtable infrastructure provides a rule
+action that allows you to specify when to add a flow to the flowtable.
+
+A packet that finds a matching entry in the flowtable (ie. flowtable hit) is
+transmitted to the output netdevice via neigh_xmit(), hence, packets bypass the
+classic IP forwarding path (the visible effect is that you do not see these
+packets from any of the Netfilter hooks coming after ingress). In case that
+there is no matching entry in the flowtable (ie. flowtable miss), the packet
+follows the classic IP forwarding path.
+
+The flowtable uses a resizable hashtable. Lookups are based on the following
+n-tuple selectors: layer 2 protocol encapsulation (VLAN and PPPoE), layer 3
+source and destination, layer 4 source and destination ports and the input
+interface (useful in case there are several conntrack zones in place).
+
+The 'flow add' action allows you to populate the flowtable, the user selectively
+specifies what flows are placed into the flowtable. Hence, packets follow the
+classic IP forwarding path unless the user explicitly instruct flows to use this
+new alternative forwarding path via policy.
+
+The flowtable datapath is represented in Fig.1, which describes the classic IP
+forwarding path including the Netfilter hooks and the flowtable fastpath bypass.
+
+::
+
+					 userspace process
+					  ^              |
+					  |              |
+				     _____|____     ____\/___
+				    /          \   /         \
+				    |   input   |  |  output  |
+				    \__________/   \_________/
+					 ^               |
+					 |               |
+      _________      __________      ---------     _____\/_____
+     /         \    /          \     |Routing |   /            \
+  -->  ingress  ---> prerouting ---> |decision|   | postrouting |--> neigh_xmit
+     \_________/    \__________/     ----------   \____________/          ^
+       |      ^                          |               ^                |
+   flowtable  |                     ____\/___            |                |
+       |      |                    /         \           |                |
+    __\/___   |                    | forward |------------                |
+    |-----|   |                    \_________/                            |
+    |-----|   |                 'flow offload' rule                       |
+    |-----|   |                   adds entry to                           |
+    |_____|   |                     flowtable                             |
+       |      |                                                           |
+      / \     |                                                           |
+     /hit\_no_|                                                           |
+     \ ? /                                                                |
+      \ /                                                                 |
+       |__yes_________________fastpath bypass ____________________________|
+
+	       Fig.1 Netfilter hooks and flowtable interactions
+
+The flowtable entry also stores the NAT configuration, so all packets are
+mangled according to the NAT policy that is specified from the classic IP
+forwarding path. The TTL is decremented before calling neigh_xmit(). Fragmented
+traffic is passed up to follow the classic IP forwarding path given that the
+transport header is missing, in this case, flowtable lookups are not possible.
+TCP RST and FIN packets are also passed up to the classic IP forwarding path to
+release the flow gracefully. Packets that exceed the MTU are also passed up to
+the classic forwarding path to report packet-too-big ICMP errors to the sender.
+
+Example configuration
+---------------------
+
+Enabling the flowtable bypass is relatively easy, you only need to create a
+flowtable and add one rule to your forward chain::
+
+	table inet x {
+		flowtable f {
+			hook ingress priority 0; devices = { eth0, eth1 };
+		}
+		chain y {
+			type filter hook forward priority 0; policy accept;
+			ip protocol tcp flow add @f
+			counter packets 0 bytes 0
+		}
+	}
+
+This example adds the flowtable 'f' to the ingress hook of the eth0 and eth1
+netdevices. You can create as many flowtables as you want in case you need to
+perform resource partitioning. The flowtable priority defines the order in which
+hooks are run in the pipeline, this is convenient in case you already have a
+nftables ingress chain (make sure the flowtable priority is smaller than the
+nftables ingress chain hence the flowtable runs before in the pipeline).
+
+The 'flow offload' action from the forward chain 'y' adds an entry to the
+flowtable for the TCP syn-ack packet coming in the reply direction. Once the
+flow is offloaded, you will observe that the counter rule in the example above
+does not get updated for the packets that are being forwarded through the
+forwarding bypass.
+
+You can identify offloaded flows through the [OFFLOAD] tag when listing your
+connection tracking table.
+
+::
+
+	# conntrack -L
+	tcp      6 src=10.141.10.2 dst=192.168.10.2 sport=52728 dport=5201 src=192.168.10.2 dst=192.168.10.1 sport=5201 dport=52728 [OFFLOAD] mark=0 use=2
+
+
+Layer 2 encapsulation
+---------------------
+
+Since Linux kernel 5.13, the flowtable infrastructure discovers the real
+netdevice behind VLAN and PPPoE netdevices. The flowtable software datapath
+parses the VLAN and PPPoE layer 2 headers to extract the ethertype and the
+VLAN ID / PPPoE session ID which are used for the flowtable lookups. The
+flowtable datapath also deals with layer 2 decapsulation.
+
+You do not need to add the PPPoE and the VLAN devices to your flowtable,
+instead the real device is sufficient for the flowtable to track your flows.
+
+Bridge and IP forwarding
+------------------------
+
+Since Linux kernel 5.13, you can add bridge ports to the flowtable. The
+flowtable infrastructure discovers the topology behind the bridge device. This
+allows the flowtable to define a fastpath bypass between the bridge ports
+(represented as eth1 and eth2 in the example figure below) and the gateway
+device (represented as eth0) in your switch/router.
+
+::
+
+                      fastpath bypass
+               .-------------------------.
+              /                           \
+              |           IP forwarding   |
+              |          /             \ \/
+              |       br0               eth0 ..... eth0
+              .       / \                          *host B*
+               -> eth1  eth2
+                   .           *switch/router*
+                   .
+                   .
+                 eth0
+               *host A*
+
+The flowtable infrastructure also supports for bridge VLAN filtering actions
+such as PVID and untagged. You can also stack a classic VLAN device on top of
+your bridge port.
+
+If you would like that your flowtable defines a fastpath between your bridge
+ports and your IP forwarding path, you have to add your bridge ports (as
+represented by the real netdevice) to your flowtable definition.
+
+Counters
+--------
+
+The flowtable can synchronize packet and byte counters with the existing
+connection tracking entry by specifying the counter statement in your flowtable
+definition, e.g.
+
+::
+
+	table inet x {
+		flowtable f {
+			hook ingress priority 0; devices = { eth0, eth1 };
+			counter
+		}
+	}
+
+Counter support is available since Linux kernel 5.7.
+
+Hardware offload
+----------------
+
+If your network device provides hardware offload support, you can turn it on by
+means of the 'offload' flag in your flowtable definition, e.g.
+
+::
+
+	table inet x {
+		flowtable f {
+			hook ingress priority 0; devices = { eth0, eth1 };
+			flags offload;
+		}
+	}
+
+There is a workqueue that adds the flows to the hardware. Note that a few
+packets might still run over the flowtable software path until the workqueue has
+a chance to offload the flow to the network device.
+
+You can identify hardware offloaded flows through the [HW_OFFLOAD] tag when
+listing your connection tracking table. Please, note that the [OFFLOAD] tag
+refers to the software offload mode, so there is a distinction between [OFFLOAD]
+which refers to the software flowtable fastpath and [HW_OFFLOAD] which refers
+to the hardware offload datapath being used by the flow.
+
+The flowtable hardware offload infrastructure also supports for the DSA
+(Distributed Switch Architecture).
+
+Limitations
+-----------
+
+The flowtable behaves like a cache. The flowtable entries might get stale if
+either the destination MAC address or the egress netdevice that is used for
+transmission changes.
+
+This might be a problem if:
+
+- You run the flowtable in software mode and you combine bridge and IP
+  forwarding in your setup.
+- Hardware offload is enabled.
+
+More reading
+------------
+
+This documentation is based on the LWN.net articles [1]_\ [2]_. Rafal Milecki
+also made a very complete and comprehensive summary called "A state of network
+acceleration" that describes how things were before this infrastructure was
+mainlined [3]_ and it also makes a rough summary of this work [4]_.
+
+.. [1] https://lwn.net/Articles/738214/
+.. [2] https://lwn.net/Articles/742164/
+.. [3] http://lists.infradead.org/pipermail/lede-dev/2018-January/010830.html
+.. [4] http://lists.infradead.org/pipermail/lede-dev/2018-January/010829.html