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, 138 insertions, 0 deletions

diff --git a/Documentation/translations/zh_CN/core-api/memory-allocation.rst b/Documentation/translations/zh_CN/core-api/memory-allocation.rst
new file mode 100644
index 000000000..e17b87dfd
--- /dev/null
+++ b/Documentation/translations/zh_CN/core-api/memory-allocation.rst
@@ -0,0 +1,138 @@
+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: Documentation/core-api/memory-allocation.rst
+
+:翻译:
+
+ 司延腾 Yanteng Si <siyanteng@loongson.cn>
+
+:校译:
+
+ 时奎亮 <alexs@kernel.org>
+
+.. _cn_core-api_memory-allocation:
+
+============
+内存分配指南
+============
+
+Linux为内存分配提供了多种API。你可以使用 `kmalloc` 或 `kmem_cache_alloc`
+系列分配小块内存，使用 `vmalloc` 及其派生产品分配大的几乎连续的区域，或者
+你可以用 alloc_pages 直接向页面分配器请求页面。也可以使用更专业的分配器，
+例如 `cma_alloc` 或 `zs_malloc` 。
+
+大多数的内存分配API使用GFP标志来表达该内存应该如何分配。GFP的缩写代表
+“(get free pages)获取空闲页”，是底层的内存分配功能。
+
+（内存）分配API的多样性与众多的GFP标志相结合，使得“我应该如何分配内存？”这个问
+题不那么容易回答，尽管很可能你应该使用
+
+::
+
+  kzalloc(<size>, GFP_KERNEL);
+
+当然，有些情况下必须使用其他分配API和不同的GFP标志。
+
+获取空闲页标志
+==============
+GFP标志控制分配器的行为。它们告诉我们哪些内存区域可以被使用，分配器应该多努力寻
+找空闲的内存，这些内存是否可以被用户空间访问等等。内存管理API为GFP标志和它们的
+组合提供了参考文件，这里我们简要介绍一下它们的推荐用法:
+
+  * 大多数时候， ``GFP_KERNEL`` 是你需要的。内核数据结构的内存，DMA可用内存，inode
+    缓存，所有这些和其他许多分配类型都可以使用 ``GFP_KERNEL`` 。注意，使用 ``GFP_KERNEL``
+    意味着 ``GFP_RECLAIM`` ，这意味着在有内存压力的情况下可能会触发直接回收；调用上
+    下文必须允许睡眠。
+
+  * 如果分配是从一个原子上下文中进行的，例如中断处理程序，使用 ``GFP_NOWAIT`` 。这个
+    标志可以防止直接回收和IO或文件系统操作。因此，在内存压力下， ``GFP_NOWAIT`` 分配
+    可能会失败。有合理退路的分配应该使用 ``GFP_NOWARN`` 。
+
+  * 如果你认为访问保留内存区是合理的，并且除非分配成功，否则内核会有压力，你可以使用 ``GFP_ATOMIC`` 。
+
+  * 从用户空间触发的不可信任的分配应该是kmem核算的对象，必须设置 ``__GFP_ACCOUNT`` 位。
+    有一个方便的用于 ``GFP_KERNEL`` 分配的 ``GFP_KERNEL_ACCOUNT`` 快捷键，其应该被核
+    算。
+
+  * 用户空间的分配应该使用 ``GFP_USER`` 、 ``GFP_HIGHUSER`` 或 ``GFP_HIGHUSER_MOVABLE``
+    中的一个标志。标志名称越长，限制性越小。
+
+    ``GFP_HIGHUSER_MOVABLE`` 不要求分配的内存将被内核直接访问，并意味着数据是可迁移的。
+
+    ``GFP_HIGHUSER`` 意味着所分配的内存是不可迁移的，但也不要求它能被内核直接访问。举个
+    例子就是一个硬件分配内存，这些数据直接映射到用户空间，但没有寻址限制。
+
+    ``GFP_USER`` 意味着分配的内存是不可迁移的，它必须被内核直接访问。
+
+你可能会注意到，在现有的代码中，有相当多的分配指定了 ``GFP_NOIO`` 或 ``GFP_NOFS`` 。
+从历史上看，它们被用来防止递归死锁，这种死锁是由直接内存回收调用到FS或IO路径以及对已
+经持有的资源进行阻塞引起的。从4.12开始，解决这个问题的首选方法是使用新的范围API，即
+:ref:`Documentation/core-api/gfp_mask-from-fs-io.rst <gfp_mask_from_fs_io>`.
+
+其他传统的GFP标志是 ``GFP_DMA`` 和 ``GFP_DMA32`` 。它们用于确保分配的内存可以被寻
+址能力有限的硬件访问。因此，除非你正在为一个有这种限制的设备编写驱动程序，否则要避免
+使用这些标志。而且，即使是有限制的硬件，也最好使用dma_alloc* APIs。
+
+GFP标志和回收行为
+-----------------
+内存分配可能会触发直接或后台回收，了解页面分配器将如何努力满足该请求或其他请求是非常
+有用的。
+
+  * ``GFP_KERNEL & ~__GFP_RECLAIM`` - 乐观分配，完全不尝试释放内存。最轻量级的模
+    式，甚至不启动后台回收。应该小心使用，因为它可能会耗尽内存，而下一个用户可能会启
+    动更积极的回收。
+
+  * ``GFP_KERNEL & ~__GFP_DIRECT_RECLAIM`` (or ``GFP_NOWAIT`` ) - 乐观分配，不
+    试图从当前上下文中释放内存，但如果该区域低于低水位，可以唤醒kswapd来回收内存。可
+    以从原子上下文中使用，或者当请求是一个性能优化，并且有另一个慢速路径的回退。
+
+  * ``(GFP_KERNEL|__GFP_HIGH) & ~__GFP_DIRECT_RECLAIM`` (aka ``GFP_ATOMIC`` ) - 非
+    睡眠分配，有一个昂贵的回退，所以它可以访问某些部分的内存储备。通常从中断/底层上下
+    文中使用，有一个昂贵的慢速路径回退。
+
+  * ``GFP_KERNEL`` - 允许后台和直接回收，并使用默认的页面分配器行为。这意味着廉价
+    的分配请求基本上是不会失败的，但不能保证这种行为，所以失败必须由调用者适当检查（例
+    如，目前允许OOM杀手失败）。
+
+  * ``GFP_KERNEL | __GFP_NORETRY`` - 覆盖默认的分配器行为，所有的分配请求都会提前
+    失败，而不是导致破坏性的回收（在这个实现中是一轮的回收）。OOM杀手不被调用。
+
+  * ``GFP_KERNEL | __GFP_RETRY_MAYFAIL`` - 覆盖 **默认** 的分配器行为，所有分配请求都非
+    常努力。如果回收不能取得任何进展，该请求将失败。OOM杀手不会被触发。
+
+  * ``GFP_KERNEL | __GFP_NOFAIL`` - 覆盖默认的分配器行为，所有分配请求将无休止地循
+    环，直到成功。这可能真的很危险，特别是对于较大的需求。
+
+选择内存分配器
+==============
+
+分配内存的最直接的方法是使用kmalloc()系列的函数。而且，为了安全起见，最好使用将内存
+设置为零的例程，如kzalloc()。如果你需要为一个数组分配内存，有kmalloc_array()和kcalloc()
+辅助程序。辅助程序struct_size()、array_size()和array3_size()可以用来安全地计算对
+象的大小而不会溢出。
+
+可以用 `kmalloc` 分配的块的最大尺寸是有限的。实际的限制取决于硬件和内核配置，但是对于
+小于页面大小的对象，使用 `kmalloc` 是一个好的做法。
+
+用 `kmalloc` 分配的块的地址至少要对齐到ARCH_KMALLOC_MINALIGN字节。对于2的幂的大小，
+对齐方式也被保证为至少是各自的大小。
+
+用kmalloc()分配的块可以用krealloc()调整大小。与kmalloc_array()类似：以krealloc_array()
+的形式提供了一个用于调整数组大小的辅助工具。
+
+对于大量的分配，你可以使用vmalloc()和vzalloc()，或者直接向页面分配器请求页面。由vmalloc
+和相关函数分配的内存在物理上是不连续的。
+
+如果你不确定分配的大小对 `kmalloc` 来说是否太大，可以使用kvmalloc()及其派生函数。它将尝
+试用kmalloc分配内存，如果分配失败，将用 `vmalloc` 重新尝试。对于哪些GFP标志可以与 `kvmalloc`
+一起使用是有限制的；请看kvmalloc_node()参考文档。注意， `kvmalloc` 可能会返回物理上不连
+续的内存。
+
+如果你需要分配许多相同的对象，你可以使用slab缓存分配器。在使用缓存之前，应该用
+kmem_cache_create()或kmem_cache_create_usercopy()来设置缓存。如果缓存的一部分可能被复
+制到用户空间，应该使用第二个函数。在缓存被创建后，kmem_cache_alloc()和它的封装可以从该缓
+存中分配内存。
+
+当分配的内存不再需要时，它必须被释放。你可以使用kvfree()来处理用 `kmalloc` 、 `vmalloc`
+和 `kvmalloc` 分配的内存。slab缓存应该用kmem_cache_free()来释放。不要忘记用
+kmem_cache_destroy()来销毁缓存。