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, 133 insertions, 0 deletions

diff --git a/Documentation/translations/zh_CN/mm/vmalloced-kernel-stacks.rst b/Documentation/translations/zh_CN/mm/vmalloced-kernel-stacks.rst
new file mode 100644
index 000000000..d02a23f7f
--- /dev/null
+++ b/Documentation/translations/zh_CN/mm/vmalloced-kernel-stacks.rst
@@ -0,0 +1,133 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: Documentation/mm/vmalloced-kernel-stacks.rst
+
+:翻译:
+
+ 司延腾 Yanteng Si <siyanteng@loongson.cn>
+
+:校译:
+
+====================
+支持虚拟映射的内核栈
+====================
+
+:作者: Shuah Khan <skhan@linuxfoundation.org>
+
+.. contents:: :local:
+
+概览
+----
+
+这是介绍 `虚拟映射内核栈功能 <https://lwn.net/Articles/694348/>` 的代码
+和原始补丁系列的信息汇总。
+
+简介
+----
+
+内核堆栈溢出通常难以调试，并使内核容易被（恶意）利用。问题可能在稍后的时间出现，使其难以
+隔离和究其根本原因。
+
+带有保护页的虚拟映射内核堆栈如果溢出，会被立即捕获，而不会放任其导致难以诊断的损
+坏。
+
+HAVE_ARCH_VMAP_STACK和VMAP_STACK配置选项能够支持带有保护页的虚拟映射堆栈。
+当堆栈溢出时，这个特性会引发可靠的异常。溢出后堆栈跟踪的可用性以及对溢出本身的
+响应取决于架构。
+
+.. note::
+        截至本文撰写时， arm64, powerpc, riscv, s390, um, 和 x86 支持VMAP_STACK。
+
+HAVE_ARCH_VMAP_STACK
+--------------------
+
+能够支持虚拟映射内核栈的架构应该启用这个bool配置选项。要求是:
+
+- vmalloc空间必须大到足以容纳许多内核堆栈。这可能排除了许多32位架构。
+- vmalloc空间的堆栈需要可靠地工作。例如，如果vmap页表是按需创建的，当堆栈指向
+  具有未填充页表的虚拟地址时，这种机制需要工作，或者架构代码（switch_to()和
+  switch_mm()，很可能）需要确保堆栈的页表项在可能未填充的堆栈上运行之前已经填
+  充。
+- 如果堆栈溢出到一个保护页，就应该发生一些合理的事情。“合理”的定义是灵活的，但
+  在没有记录任何东西的情况下立即重启是不友好的。
+
+VMAP_STACK
+----------
+
+VMAP_STACK bool配置选项在启用时分配虚拟映射的任务栈。这个选项依赖于
+HAVE_ARCH_VMAP_STACK。
+
+- 如果你想使用带有保护页的虚拟映射的内核堆栈，请启用该选项。这将导致内核栈溢出
+  被立即捕获，而不是难以诊断的损坏。
+
+.. note::
+
+        使用KASAN的这个功能需要架构支持用真实的影子内存来支持虚拟映射，并且
+        必须启用KASAN_VMALLOC。
+
+.. note::
+
+        启用VMAP_STACK时，无法在堆栈分配的数据上运行DMA。
+
+内核配置选项和依赖性不断变化。请参考最新的代码库:
+
+`Kconfig <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/Kconfig>`
+
+分配方法
+--------
+
+当一个新的内核线程被创建时，线程堆栈是由页级分配器分配的虚拟连续的内存页组成。这
+些页面被映射到有PAGE_KERNEL保护的连续的内核虚拟空间。
+
+alloc_thread_stack_node()调用__vmalloc_node_range()来分配带有PAGE_KERNEL
+保护的栈。
+
+- 分配的堆栈被缓存起来，以后会被新的线程重用，所以在分配/释放堆栈给任务时，要手动
+  进行memcg核算。因此，__vmalloc_node_range被调用时没有__GFP_ACCOUNT。
+- vm_struct被缓存起来，以便能够找到在中断上下文中启动的空闲线程。 free_thread_stack()
+  可以在中断上下文中调用。
+- 在arm64上，所有VMAP的堆栈都需要有相同的对齐方式，以确保VMAP的堆栈溢出检测正常
+  工作。架构特定的vmap堆栈分配器照顾到了这个细节。
+- 这并不涉及中断堆栈--参考原始补丁
+
+线程栈分配是由clone()、fork()、vfork()、kernel_thread()通过kernel_clone()
+启动的。留点提示在这，以便搜索代码库，了解线程栈何时以及如何分配。
+
+大量的代码是在:
+`kernel/fork.c <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/fork.c>`.
+
+task_struct中的stack_vm_area指针可以跟踪虚拟分配的堆栈，一个非空的stack_vm_area
+指针可以表明虚拟映射的内核堆栈已经启用。
+
+::
+
+        struct vm_struct *stack_vm_area;
+
+堆栈溢出处理
+------------
+
+前守护页和后守护页有助于检测堆栈溢出。当堆栈溢出到守护页时，处理程序必须小心不要再
+次溢出堆栈。当处理程序被调用时，很可能只留下很少的堆栈空间。
+
+在x86上，这是通过处理表明内核堆栈溢出的双异常堆栈的缺页异常来实现的。
+
+用守护页测试VMAP分配
+--------------------
+
+我们如何确保VMAP_STACK在分配时确实有前守护页和后守护页的保护？下面的 lkdtm 测试
+可以帮助检测任何回归。
+
+::
+
+        void lkdtm_STACK_GUARD_PAGE_LEADING()
+        void lkdtm_STACK_GUARD_PAGE_TRAILING()
+
+结论
+----
+
+- vmalloced堆栈的percpu缓存似乎比高阶堆栈分配要快一些，至少在缓存命中时是这样。
+- THREAD_INFO_IN_TASK完全摆脱了arch-specific thread_info，并简单地将
+  thread_info（仅包含标志）和'int cpu'嵌入task_struct中。
+- 一旦任务死亡，线程栈就可以被释放（无需等待RCU），然后，如果使用vmapped栈，就
+  可以将整个栈缓存起来，以便在同一cpu上重复使用。