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, 149 insertions, 0 deletions

diff --git a/Documentation/translations/zh_CN/locking/spinlocks.rst b/Documentation/translations/zh_CN/locking/spinlocks.rst
new file mode 100644
index 000000000..2017c01f0
--- /dev/null
+++ b/Documentation/translations/zh_CN/locking/spinlocks.rst
@@ -0,0 +1,149 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: Documentation/locking/spinlocks.rst
+
+:翻译:
+
+  唐艺舟 Tang Yizhou <tangyeechou@gmail.com>
+
+==========
+加锁的教训
+==========
+
+教训 1：自旋锁
+==============
+
+加锁最基本的原语是自旋锁（spinlock）::
+
+  static DEFINE_SPINLOCK(xxx_lock);
+
+	unsigned long flags;
+
+	spin_lock_irqsave(&xxx_lock, flags);
+	... 这里是临界区 ..
+	spin_unlock_irqrestore(&xxx_lock, flags);
+
+上述代码总是安全的。自旋锁将在 _本地_ 禁用中断，但它本身将保证全局锁定。所以它
+将保证在该锁保护的区域内只有一个控制线程。即使在单处理器（UP）下也能很好的工作，
+所以代码 _不_ 需要担心UP还是SMP的问题：自旋锁在两种情况下都能正常工作。
+
+   注意！自旋锁对内存的潜在影响由下述文档进一步描述：
+
+     Documentation/memory-barriers.txt
+
+       (5) ACQUIRE operations.
+
+       (6) RELEASE operations.
+
+上述代码通常非常简单（对大部分情况，你通常需要并且只希望有一个自旋锁——使用多个
+自旋锁会使事情变得更复杂，甚至更慢，而且通常仅仅在你 **理解的** 序列有被拆分的
+需求时才值得这么做：如果你不确定的话，请不惜一切代价避免这样做）。
+
+这是关于自旋锁的唯一真正困难的部分：一旦你开始使用自旋锁，它们往往会扩展到你以前
+可能没有注意到的领域，因为你必须确保自旋锁正确地保护共享数据结构 **每一处** 被
+使用的地方。自旋锁是最容易被添加到完全独立于其它代码的地方（例如，没有人访问的
+内部驱动数据结构）的。
+
+   注意！仅当你在跨CPU核访问时使用 **同一把** 自旋锁，对它的使用才是安全的。
+   这意味着所有访问共享变量的代码必须对它们想使用的自旋锁达成一致。
+
+----
+
+教训 2：读-写自旋锁
+===================
+
+如果你的数据访问有一个非常自然的模式，倾向于从共享变量中读取数据，读-写自旋锁
+（rw_lock）有时是有用的。它们允许多个读者同时出现在同一个临界区，但是如果有人想
+改变变量，它必须获得一个独占的写锁。
+
+   注意！读-写自旋锁比原始自旋锁需要更多的原子内存操作。除非读者的临界区很长，
+   否则你最好只使用原始自旋锁。
+
+例程看起来和上面一样::
+
+   rwlock_t xxx_lock = __RW_LOCK_UNLOCKED(xxx_lock);
+
+	unsigned long flags;
+
+	read_lock_irqsave(&xxx_lock, flags);
+	.. 仅读取信息的临界区 ...
+	read_unlock_irqrestore(&xxx_lock, flags);
+
+	write_lock_irqsave(&xxx_lock, flags);
+	.. 读取和独占写信息 ...
+	write_unlock_irqrestore(&xxx_lock, flags);
+
+上面这种锁对于复杂的数据结构如链表可能会有用，特别是在不改变链表的情况下搜索其中
+的条目。读锁允许许多并发的读者。任何希望 **修改** 链表的代码将必须先获取写锁。
+
+   注意！RCU锁更适合遍历链表，但需要仔细注意设计细节（见Documentation/RCU/listRCU.rst）。
+
+另外，你不能把读锁“升级”为写锁，所以如果你在 _任何_ 时候需要做任何修改
+（即使你不是每次都这样做），你必须在一开始就获得写锁。
+
+   注意！我们正在努力消除大多数情况下的读-写自旋锁的使用，所以请不要在没有达成
+   共识的情况下增加一个新的（相反，请参阅Documentation/RCU/rcu.rst以获得完整
+   信息）。
+
+----
+
+教训 3：重新审视自旋锁
+======================
+
+上述的自旋锁原语绝不是唯一的。它们是最安全的，在所有情况下都能正常工作，但部分
+**因为** 它们是安全的，它们也是相当慢的。它们比原本需要的更慢，因为它们必须要
+禁用中断（在X86上只是一条指令，但却是一条昂贵的指令——而在其他体系结构上，情况
+可能更糟）。
+
+如果你有必须保护跨CPU访问的数据结构且你想使用自旋锁的场景，你有可能使用代价小的
+自旋锁版本。当且仅当你知道某自旋锁永远不会在中断处理程序中使用，你可以使用非中断
+的版本::
+
+	spin_lock(&lock);
+	...
+	spin_unlock(&lock);
+
+（当然，也可以使用相应的读-写锁版本）。这种自旋锁将同样可以保证独占访问，而且
+速度会快很多。如果你知道有关的数据只在“进程上下文”中被存取，即，不涉及中断，
+这种自旋锁就有用了。
+
+当这些版本的自旋锁涉及中断时，你不能使用的原因是会陷入死锁::
+
+	spin_lock(&lock);
+	...
+		<- 中断来临：
+			spin_lock(&lock);
+
+一个中断试图对一个已经锁定的变量上锁。如果中断发生在另一个CPU上，不会有问题；
+但如果中断发生在已经持有自旋锁的同一个CPU上，将 _会_ 有问题，因为该锁显然永远
+不会被释放（因为中断正在等待该锁，而锁的持有者被中断打断，并且无法继续执行，
+直到中断处理结束）。
+
+（这也是自旋锁的中断版本只需要禁用 _本地_ 中断的原因——在发生于其它CPU的中断中
+使用同一把自旋锁是没问题的，因为发生于其它CPU的中断不会打断已经持锁的CPU，所以
+锁的持有者可以继续执行并最终释放锁）。
+
+		Linus
+
+----
+
+参考信息
+========
+
+对于动态初始化，使用spin_lock_init()或rwlock_init()是合适的::
+
+   spinlock_t xxx_lock;
+   rwlock_t xxx_rw_lock;
+
+   static int __init xxx_init(void)
+   {
+	spin_lock_init(&xxx_lock);
+	rwlock_init(&xxx_rw_lock);
+	...
+   }
+
+   module_init(xxx_init);
+
+对于静态初始化，使用DEFINE_SPINLOCK() / DEFINE_RWLOCK()或
+__SPIN_LOCK_UNLOCKED() / __RW_LOCK_UNLOCKED()是合适的。