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, 205 insertions, 0 deletions

diff --git a/Documentation/translations/zh_CN/scheduler/sched-design-CFS.rst b/Documentation/translations/zh_CN/scheduler/sched-design-CFS.rst
new file mode 100644
index 000000000..307640240
--- /dev/null
+++ b/Documentation/translations/zh_CN/scheduler/sched-design-CFS.rst
@@ -0,0 +1,205 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: Documentation/scheduler/sched-design-CFS.rst
+
+:翻译:
+
+  唐艺舟 Tang Yizhou <tangyeechou@gmail.com>
+
+===============
+完全公平调度器
+===============
+
+
+1. 概述
+=======
+
+CFS表示“完全公平调度器”，它是为桌面新设计的进程调度器，由Ingo Molnar实现并合入Linux
+2.6.23。它替代了之前原始调度器中SCHED_OTHER策略的交互式代码。
+
+CFS 80%的设计可以总结为一句话：CFS在真实硬件上建模了一个“理想的，精确的多任务CPU”。
+
+“理想的多任务CPU”是一种（不存在的 :-)）具有100%物理算力的CPU，它能让每个任务精确地以
+相同的速度并行运行，速度均为1/nr_running。举例来说，如果有两个任务正在运行，那么每个
+任务获得50%物理算力。 --- 也就是说，真正的并行。
+
+在真实的硬件上，一次只能运行一个任务，所以我们需要介绍“虚拟运行时间”的概念。任务的虚拟
+运行时间表明，它的下一个时间片将在上文描述的理想多任务CPU上开始执行。在实践中，任务的
+虚拟运行时间由它的真实运行时间相较正在运行的任务总数归一化计算得到。
+
+
+
+2. 一些实现细节
+===============
+
+在CFS中，虚拟运行时间由每个任务的p->se.vruntime（单位为纳秒）的值表达和跟踪。因此，
+精确地计时和测量一个任务应得的“预期的CPU时间”是可能的。
+
+  一些细节：在“理想的”硬件上，所有的任务在任何时刻都应该具有一样的p->se.vruntime值，
+  --- 也就是说，任务应当同时执行，没有任务会在“理想的”CPU分时中变得“不平衡”。
+
+CFS的任务选择逻辑基于p->se.vruntime的值，因此非常简单：总是试图选择p->se.vruntime值
+最小的任务运行（也就是说，至今执行时间最少的任务）。CFS总是尽可能尝试按“理想多任务硬件”
+那样将CPU时间在可运行任务中均分。
+
+CFS剩下的其它设计，一般脱离了这个简单的概念，附加的设计包括nice级别，多处理，以及各种
+用来识别已睡眠任务的算法变体。
+
+
+
+3. 红黑树
+=========
+
+CFS的设计非常激进：它不使用运行队列的旧数据结构，而是使用按时间排序的红黑树，构建出
+任务未来执行的“时间线”。因此没有任何“数组切换”的旧包袱（之前的原始调度器和RSDL/SD都
+被它影响）。
+
+CFS同样维护了rq->cfs.min_vruntime值，它是单调递增的，跟踪运行队列中的所有任务的最小
+虚拟运行时间值。系统做的全部工作是：使用min_vruntime跟踪，然后用它的值将新激活的调度
+实体尽可能地放在红黑树的左侧。
+
+运行队列中正在运行的任务的总数由rq->cfs.load计数，它是运行队列中的任务的权值之和。
+
+CFS维护了一个按时间排序的红黑树，所有可运行任务以p->se.vruntime为键值排序。CFS从这颗
+树上选择“最左侧”的任务并运行。系统继续运行，被执行过的任务越来越被放到树的右侧 --- 缓慢，
+但很明确每个任务都有成为“最左侧任务”的机会，因此任务将确定性地获得一定量CPU时间。
+
+总结一下，CFS工作方式像这样：它运行一个任务一会儿，当任务发生调度（或者调度器时钟滴答
+tick产生），就会考虑任务的CPU使用率：任务刚刚花在物理CPU上的（少量）时间被加到
+p->se.vruntime。一旦p->se.vruntime变得足够大，其它的任务将成为按时间排序的红黑树的
+“最左侧任务”（相较最左侧的任务，还要加上一个很小的“粒度”量，使得我们不会对任务过度调度，
+导致缓存颠簸），然后新的最左侧任务将被选中，当前任务被抢占。
+
+
+
+
+4. CFS的一些特征
+================
+
+CFS使用纳秒粒度的计时，不依赖于任何jiffies或HZ的细节。因此CFS并不像之前的调度器那样
+有“时间片”的概念，也没有任何启发式的设计。唯一可调的参数（你需要打开CONFIG_SCHED_DEBUG）是：
+
+   /sys/kernel/debug/sched/min_granularity_ns
+
+它可以用来将调度器从“桌面”模式（也就是低时延）调节为“服务器”（也就是高批处理）模式。
+它的默认设置是适合桌面的工作负载。SCHED_BATCH也被CFS调度器模块处理。
+
+CFS的设计不易受到当前存在的任何针对stock调度器的“攻击”的影响，包括fiftyp.c，thud.c，
+chew.c，ring-test.c，massive_intr.c，它们都能很好地运行，不会影响交互性，将产生
+符合预期的行为。
+
+CFS调度器处理nice级别和SCHED_BATCH的能力比之前的原始调度器更强：两种类型的工作负载
+都被更激进地隔离了。
+
+SMP负载均衡被重做/清理过：遍历运行队列的假设已经从负载均衡的代码中移除，使用调度模块
+的迭代器。结果是，负载均衡代码变得简单不少。
+
+
+
+5. 调度策略
+===========
+
+CFS实现了三种调度策略：
+
+  - SCHED_NORMAL：（传统被称为SCHED_OTHER）：该调度策略用于普通任务。
+
+  - SCHED_BATCH：抢占不像普通任务那样频繁，因此允许任务运行更长时间，更好地利用缓存，
+    不过要以交互性为代价。它很适合批处理工作。
+
+  - SCHED_IDLE：它比nice 19更弱，不过它不是真正的idle定时器调度器，因为要避免给机器
+    带来死锁的优先级反转问题。
+
+SCHED_FIFO/_RR被实现在sched/rt.c中，它们由POSIX具体说明。
+
+util-linux-ng 2.13.1.1中的chrt命令可以设置以上所有策略，除了SCHED_IDLE。
+
+
+
+6. 调度类
+=========
+
+新的CFS调度器被设计成支持“调度类”，一种调度模块的可扩展层次结构。这些模块封装了调度策略
+细节，由调度器核心代码处理，且无需对它们做太多假设。
+
+sched/fair.c 实现了上文描述的CFS调度器。
+
+sched/rt.c 实现了SCHED_FIFO和SCHED_RR语义，且比之前的原始调度器更简洁。它使用了100个
+运行队列（总共100个实时优先级，替代了之前调度器的140个），且不需要过期数组（expired
+array）。
+
+调度类由sched_class结构体实现，它包括一些函数钩子，当感兴趣的事件发生时，钩子被调用。
+
+这是（部分）钩子的列表：
+
+ - enqueue_task(...)
+
+   当任务进入可运行状态时，被调用。它将调度实体（任务）放到红黑树中，增加nr_running变量
+   的值。
+
+ - dequeue_task(...)
+
+   当任务不再可运行时，这个函数被调用，对应的调度实体被移出红黑树。它减少nr_running变量
+   的值。
+
+ - yield_task(...)
+
+   这个函数的行为基本上是出队，紧接着入队，除非compat_yield sysctl被开启。在那种情况下，
+   它将调度实体放在红黑树的最右端。
+
+ - check_preempt_curr(...)
+
+   这个函数检查进入可运行状态的任务能否抢占当前正在运行的任务。
+
+ - pick_next_task(...)
+
+   这个函数选择接下来最适合运行的任务。
+
+ - set_curr_task(...)
+
+   这个函数在任务改变调度类或改变任务组时被调用。
+
+ - task_tick(...)
+
+   这个函数最常被时间滴答函数调用，它可能导致进程切换。这驱动了运行时抢占。
+
+
+
+
+7. CFS的组调度扩展
+==================
+
+通常，调度器操作粒度为任务，努力为每个任务提供公平的CPU时间。有时可能希望将任务编组，
+并为每个组提供公平的CPU时间。举例来说，可能首先希望为系统中的每个用户提供公平的CPU
+时间，接下来才是某个用户的每个任务。
+
+CONFIG_CGROUP_SCHED 力求实现它。它将任务编组，并为这些组公平地分配CPU时间。
+
+CONFIG_RT_GROUP_SCHED 允许将实时（也就是说，SCHED_FIFO和SCHED_RR）任务编组。
+
+CONFIG_FAIR_GROUP_SCHED 允许将CFS（也就是说，SCHED_NORMAL和SCHED_BATCH）任务编组。
+
+   这些编译选项要求CONFIG_CGROUPS被定义，然后管理员能使用cgroup伪文件系统任意创建任务组。
+   关于该文件系统的更多信息，参见Documentation/admin-guide/cgroup-v1/cgroups.rst
+
+当CONFIG_FAIR_GROUP_SCHED被定义后，通过伪文件系统，每个组被创建一个“cpu.shares”文件。
+参见下面的例子来创建任务组，并通过“cgroup”伪文件系统修改它们的CPU份额::
+
+	# mount -t tmpfs cgroup_root /sys/fs/cgroup
+	# mkdir /sys/fs/cgroup/cpu
+	# mount -t cgroup -ocpu none /sys/fs/cgroup/cpu
+	# cd /sys/fs/cgroup/cpu
+
+	# mkdir multimedia	# 创建 "multimedia" 任务组
+	# mkdir browser		# 创建 "browser" 任务组
+
+	# #配置multimedia组，令其获得browser组两倍CPU带宽
+
+	# echo 2048 > multimedia/cpu.shares
+	# echo 1024 > browser/cpu.shares
+
+	# firefox &	# 启动firefox并把它移到 "browser" 组
+	# echo <firefox_pid> > browser/tasks
+
+	# #启动gmplayer（或者你最喜欢的电影播放器）
+	# echo <movie_player_pid> > multimedia/tasks