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, 265 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_vblank_work.c b/drivers/gpu/drm/drm_vblank_work.c
new file mode 100644
index 000000000..bd481fdd6
--- /dev/null
+++ b/drivers/gpu/drm/drm_vblank_work.c
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: MIT
+
+#include <uapi/linux/sched/types.h>
+
+#include <drm/drm_print.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_vblank_work.h>
+#include <drm/drm_crtc.h>
+
+#include "drm_internal.h"
+
+/**
+ * DOC: vblank works
+ *
+ * Many DRM drivers need to program hardware in a time-sensitive manner, many
+ * times with a deadline of starting and finishing within a certain region of
+ * the scanout. Most of the time the safest way to accomplish this is to
+ * simply do said time-sensitive programming in the driver's IRQ handler,
+ * which allows drivers to avoid being preempted during these critical
+ * regions. Or even better, the hardware may even handle applying such
+ * time-critical programming independently of the CPU.
+ *
+ * While there's a decent amount of hardware that's designed so that the CPU
+ * doesn't need to be concerned with extremely time-sensitive programming,
+ * there's a few situations where it can't be helped. Some unforgiving
+ * hardware may require that certain time-sensitive programming be handled
+ * completely by the CPU, and said programming may even take too long to
+ * handle in an IRQ handler. Another such situation would be where the driver
+ * needs to perform a task that needs to complete within a specific scanout
+ * period, but might possibly block and thus cannot be handled in an IRQ
+ * context. Both of these situations can't be solved perfectly in Linux since
+ * we're not a realtime kernel, and thus the scheduler may cause us to miss
+ * our deadline if it decides to preempt us. But for some drivers, it's good
+ * enough if we can lower our chance of being preempted to an absolute
+ * minimum.
+ *
+ * This is where &drm_vblank_work comes in. &drm_vblank_work provides a simple
+ * generic delayed work implementation which delays work execution until a
+ * particular vblank has passed, and then executes the work at realtime
+ * priority. This provides the best possible chance at performing
+ * time-sensitive hardware programming on time, even when the system is under
+ * heavy load. &drm_vblank_work also supports rescheduling, so that self
+ * re-arming work items can be easily implemented.
+ */
+
+void drm_handle_vblank_works(struct drm_vblank_crtc *vblank)
+{
+	struct drm_vblank_work *work, *next;
+	u64 count = atomic64_read(&vblank->count);
+	bool wake = false;
+
+	assert_spin_locked(&vblank->dev->event_lock);
+
+	list_for_each_entry_safe(work, next, &vblank->pending_work, node) {
+		if (!drm_vblank_passed(count, work->count))
+			continue;
+
+		list_del_init(&work->node);
+		drm_vblank_put(vblank->dev, vblank->pipe);
+		kthread_queue_work(vblank->worker, &work->base);
+		wake = true;
+	}
+	if (wake)
+		wake_up_all(&vblank->work_wait_queue);
+}
+
+/* Handle cancelling any pending vblank work items and drop respective vblank
+ * references in response to vblank interrupts being disabled.
+ */
+void drm_vblank_cancel_pending_works(struct drm_vblank_crtc *vblank)
+{
+	struct drm_vblank_work *work, *next;
+
+	assert_spin_locked(&vblank->dev->event_lock);
+
+	list_for_each_entry_safe(work, next, &vblank->pending_work, node) {
+		list_del_init(&work->node);
+		drm_vblank_put(vblank->dev, vblank->pipe);
+	}
+
+	wake_up_all(&vblank->work_wait_queue);
+}
+
+/**
+ * drm_vblank_work_schedule - schedule a vblank work
+ * @work: vblank work to schedule
+ * @count: target vblank count
+ * @nextonmiss: defer until the next vblank if target vblank was missed
+ *
+ * Schedule @work for execution once the crtc vblank count reaches @count.
+ *
+ * If the crtc vblank count has already reached @count and @nextonmiss is
+ * %false the work starts to execute immediately.
+ *
+ * If the crtc vblank count has already reached @count and @nextonmiss is
+ * %true the work is deferred until the next vblank (as if @count has been
+ * specified as crtc vblank count + 1).
+ *
+ * If @work is already scheduled, this function will reschedule said work
+ * using the new @count. This can be used for self-rearming work items.
+ *
+ * Returns:
+ * %1 if @work was successfully (re)scheduled, %0 if it was either already
+ * scheduled or cancelled, or a negative error code on failure.
+ */
+int drm_vblank_work_schedule(struct drm_vblank_work *work,
+			     u64 count, bool nextonmiss)
+{
+	struct drm_vblank_crtc *vblank = work->vblank;
+	struct drm_device *dev = vblank->dev;
+	u64 cur_vbl;
+	unsigned long irqflags;
+	bool passed, inmodeset, rescheduling = false, wake = false;
+	int ret = 0;
+
+	spin_lock_irqsave(&dev->event_lock, irqflags);
+	if (work->cancelling)
+		goto out;
+
+	spin_lock(&dev->vbl_lock);
+	inmodeset = vblank->inmodeset;
+	spin_unlock(&dev->vbl_lock);
+	if (inmodeset)
+		goto out;
+
+	if (list_empty(&work->node)) {
+		ret = drm_vblank_get(dev, vblank->pipe);
+		if (ret < 0)
+			goto out;
+	} else if (work->count == count) {
+		/* Already scheduled w/ same vbl count */
+		goto out;
+	} else {
+		rescheduling = true;
+	}
+
+	work->count = count;
+	cur_vbl = drm_vblank_count(dev, vblank->pipe);
+	passed = drm_vblank_passed(cur_vbl, count);
+	if (passed)
+		drm_dbg_core(dev,
+			     "crtc %d vblank %llu already passed (current %llu)\n",
+			     vblank->pipe, count, cur_vbl);
+
+	if (!nextonmiss && passed) {
+		drm_vblank_put(dev, vblank->pipe);
+		ret = kthread_queue_work(vblank->worker, &work->base);
+
+		if (rescheduling) {
+			list_del_init(&work->node);
+			wake = true;
+		}
+	} else {
+		if (!rescheduling)
+			list_add_tail(&work->node, &vblank->pending_work);
+		ret = true;
+	}
+
+out:
+	spin_unlock_irqrestore(&dev->event_lock, irqflags);
+	if (wake)
+		wake_up_all(&vblank->work_wait_queue);
+	return ret;
+}
+EXPORT_SYMBOL(drm_vblank_work_schedule);
+
+/**
+ * drm_vblank_work_cancel_sync - cancel a vblank work and wait for it to
+ * finish executing
+ * @work: vblank work to cancel
+ *
+ * Cancel an already scheduled vblank work and wait for its
+ * execution to finish.
+ *
+ * On return, @work is guaranteed to no longer be scheduled or running, even
+ * if it's self-arming.
+ *
+ * Returns:
+ * %True if the work was cancelled before it started to execute, %false
+ * otherwise.
+ */
+bool drm_vblank_work_cancel_sync(struct drm_vblank_work *work)
+{
+	struct drm_vblank_crtc *vblank = work->vblank;
+	struct drm_device *dev = vblank->dev;
+	bool ret = false;
+
+	spin_lock_irq(&dev->event_lock);
+	if (!list_empty(&work->node)) {
+		list_del_init(&work->node);
+		drm_vblank_put(vblank->dev, vblank->pipe);
+		ret = true;
+	}
+
+	work->cancelling++;
+	spin_unlock_irq(&dev->event_lock);
+
+	wake_up_all(&vblank->work_wait_queue);
+
+	if (kthread_cancel_work_sync(&work->base))
+		ret = true;
+
+	spin_lock_irq(&dev->event_lock);
+	work->cancelling--;
+	spin_unlock_irq(&dev->event_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_vblank_work_cancel_sync);
+
+/**
+ * drm_vblank_work_flush - wait for a scheduled vblank work to finish
+ * executing
+ * @work: vblank work to flush
+ *
+ * Wait until @work has finished executing once.
+ */
+void drm_vblank_work_flush(struct drm_vblank_work *work)
+{
+	struct drm_vblank_crtc *vblank = work->vblank;
+	struct drm_device *dev = vblank->dev;
+
+	spin_lock_irq(&dev->event_lock);
+	wait_event_lock_irq(vblank->work_wait_queue, list_empty(&work->node),
+			    dev->event_lock);
+	spin_unlock_irq(&dev->event_lock);
+
+	kthread_flush_work(&work->base);
+}
+EXPORT_SYMBOL(drm_vblank_work_flush);
+
+/**
+ * drm_vblank_work_init - initialize a vblank work item
+ * @work: vblank work item
+ * @crtc: CRTC whose vblank will trigger the work execution
+ * @func: work function to be executed
+ *
+ * Initialize a vblank work item for a specific crtc.
+ */
+void drm_vblank_work_init(struct drm_vblank_work *work, struct drm_crtc *crtc,
+			  void (*func)(struct kthread_work *work))
+{
+	kthread_init_work(&work->base, func);
+	INIT_LIST_HEAD(&work->node);
+	work->vblank = &crtc->dev->vblank[drm_crtc_index(crtc)];
+}
+EXPORT_SYMBOL(drm_vblank_work_init);
+
+int drm_vblank_worker_init(struct drm_vblank_crtc *vblank)
+{
+	struct kthread_worker *worker;
+
+	INIT_LIST_HEAD(&vblank->pending_work);
+	init_waitqueue_head(&vblank->work_wait_queue);
+	worker = kthread_create_worker(0, "card%d-crtc%d",
+				       vblank->dev->primary->index,
+				       vblank->pipe);
+	if (IS_ERR(worker))
+		return PTR_ERR(worker);
+
+	vblank->worker = worker;
+
+	sched_set_fifo(worker->task);
+	return 0;
+}