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, 497 insertions, 0 deletions

diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
new file mode 100644
index 000000000..aa314ebec
--- /dev/null
+++ b/drivers/dma/idxd/irq.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <uapi/linux/idxd.h>
+#include "../dmaengine.h"
+#include "idxd.h"
+#include "registers.h"
+
+enum irq_work_type {
+	IRQ_WORK_NORMAL = 0,
+	IRQ_WORK_PROCESS_FAULT,
+};
+
+struct idxd_resubmit {
+	struct work_struct work;
+	struct idxd_desc *desc;
+};
+
+struct idxd_int_handle_revoke {
+	struct work_struct work;
+	struct idxd_device *idxd;
+};
+
+static void idxd_device_reinit(struct work_struct *work)
+{
+	struct idxd_device *idxd = container_of(work, struct idxd_device, work);
+	struct device *dev = &idxd->pdev->dev;
+	int rc, i;
+
+	idxd_device_reset(idxd);
+	rc = idxd_device_config(idxd);
+	if (rc < 0)
+		goto out;
+
+	rc = idxd_device_enable(idxd);
+	if (rc < 0)
+		goto out;
+
+	for (i = 0; i < idxd->max_wqs; i++) {
+		if (test_bit(i, idxd->wq_enable_map)) {
+			struct idxd_wq *wq = idxd->wqs[i];
+
+			rc = idxd_wq_enable(wq);
+			if (rc < 0) {
+				clear_bit(i, idxd->wq_enable_map);
+				dev_warn(dev, "Unable to re-enable wq %s\n",
+					 dev_name(wq_confdev(wq)));
+			}
+		}
+	}
+
+	return;
+
+ out:
+	idxd_device_clear_state(idxd);
+}
+
+/*
+ * The function sends a drain descriptor for the interrupt handle. The drain ensures
+ * all descriptors with this interrupt handle is flushed and the interrupt
+ * will allow the cleanup of the outstanding descriptors.
+ */
+static void idxd_int_handle_revoke_drain(struct idxd_irq_entry *ie)
+{
+	struct idxd_wq *wq = ie_to_wq(ie);
+	struct idxd_device *idxd = wq->idxd;
+	struct device *dev = &idxd->pdev->dev;
+	struct dsa_hw_desc desc = {};
+	void __iomem *portal;
+	int rc;
+
+	/* Issue a simple drain operation with interrupt but no completion record */
+	desc.flags = IDXD_OP_FLAG_RCI;
+	desc.opcode = DSA_OPCODE_DRAIN;
+	desc.priv = 1;
+
+	if (ie->pasid != INVALID_IOASID)
+		desc.pasid = ie->pasid;
+	desc.int_handle = ie->int_handle;
+	portal = idxd_wq_portal_addr(wq);
+
+	/*
+	 * The wmb() makes sure that the descriptor is all there before we
+	 * issue.
+	 */
+	wmb();
+	if (wq_dedicated(wq)) {
+		iosubmit_cmds512(portal, &desc, 1);
+	} else {
+		rc = idxd_enqcmds(wq, portal, &desc);
+		/* This should not fail unless hardware failed. */
+		if (rc < 0)
+			dev_warn(dev, "Failed to submit drain desc on wq %d\n", wq->id);
+	}
+}
+
+static void idxd_abort_invalid_int_handle_descs(struct idxd_irq_entry *ie)
+{
+	LIST_HEAD(flist);
+	struct idxd_desc *d, *t;
+	struct llist_node *head;
+
+	spin_lock(&ie->list_lock);
+	head = llist_del_all(&ie->pending_llist);
+	if (head) {
+		llist_for_each_entry_safe(d, t, head, llnode)
+			list_add_tail(&d->list, &ie->work_list);
+	}
+
+	list_for_each_entry_safe(d, t, &ie->work_list, list) {
+		if (d->completion->status == DSA_COMP_INT_HANDLE_INVAL)
+			list_move_tail(&d->list, &flist);
+	}
+	spin_unlock(&ie->list_lock);
+
+	list_for_each_entry_safe(d, t, &flist, list) {
+		list_del(&d->list);
+		idxd_dma_complete_txd(d, IDXD_COMPLETE_ABORT, true);
+	}
+}
+
+static void idxd_int_handle_revoke(struct work_struct *work)
+{
+	struct idxd_int_handle_revoke *revoke =
+		container_of(work, struct idxd_int_handle_revoke, work);
+	struct idxd_device *idxd = revoke->idxd;
+	struct pci_dev *pdev = idxd->pdev;
+	struct device *dev = &pdev->dev;
+	int i, new_handle, rc;
+
+	if (!idxd->request_int_handles) {
+		kfree(revoke);
+		dev_warn(dev, "Unexpected int handle refresh interrupt.\n");
+		return;
+	}
+
+	/*
+	 * The loop attempts to acquire new interrupt handle for all interrupt
+	 * vectors that supports a handle. If a new interrupt handle is acquired and the
+	 * wq is kernel type, the driver will kill the percpu_ref to pause all
+	 * ongoing descriptor submissions. The interrupt handle is then changed.
+	 * After change, the percpu_ref is revived and all the pending submissions
+	 * are woken to try again. A drain is sent to for the interrupt handle
+	 * at the end to make sure all invalid int handle descriptors are processed.
+	 */
+	for (i = 1; i < idxd->irq_cnt; i++) {
+		struct idxd_irq_entry *ie = idxd_get_ie(idxd, i);
+		struct idxd_wq *wq = ie_to_wq(ie);
+
+		if (ie->int_handle == INVALID_INT_HANDLE)
+			continue;
+
+		rc = idxd_device_request_int_handle(idxd, i, &new_handle, IDXD_IRQ_MSIX);
+		if (rc < 0) {
+			dev_warn(dev, "get int handle %d failed: %d\n", i, rc);
+			/*
+			 * Failed to acquire new interrupt handle. Kill the WQ
+			 * and release all the pending submitters. The submitters will
+			 * get error return code and handle appropriately.
+			 */
+			ie->int_handle = INVALID_INT_HANDLE;
+			idxd_wq_quiesce(wq);
+			idxd_abort_invalid_int_handle_descs(ie);
+			continue;
+		}
+
+		/* No change in interrupt handle, nothing needs to be done */
+		if (ie->int_handle == new_handle)
+			continue;
+
+		if (wq->state != IDXD_WQ_ENABLED || wq->type != IDXD_WQT_KERNEL) {
+			/*
+			 * All the MSIX interrupts are allocated at once during probe.
+			 * Therefore we need to update all interrupts even if the WQ
+			 * isn't supporting interrupt operations.
+			 */
+			ie->int_handle = new_handle;
+			continue;
+		}
+
+		mutex_lock(&wq->wq_lock);
+		reinit_completion(&wq->wq_resurrect);
+
+		/* Kill percpu_ref to pause additional descriptor submissions */
+		percpu_ref_kill(&wq->wq_active);
+
+		/* Wait for all submitters quiesce before we change interrupt handle */
+		wait_for_completion(&wq->wq_dead);
+
+		ie->int_handle = new_handle;
+
+		/* Revive percpu ref and wake up all the waiting submitters */
+		percpu_ref_reinit(&wq->wq_active);
+		complete_all(&wq->wq_resurrect);
+		mutex_unlock(&wq->wq_lock);
+
+		/*
+		 * The delay here is to wait for all possible MOVDIR64B that
+		 * are issued before percpu_ref_kill() has happened to have
+		 * reached the PCIe domain before the drain is issued. The driver
+		 * needs to ensure that the drain descriptor issued does not pass
+		 * all the other issued descriptors that contain the invalid
+		 * interrupt handle in order to ensure that the drain descriptor
+		 * interrupt will allow the cleanup of all the descriptors with
+		 * invalid interrupt handle.
+		 */
+		if (wq_dedicated(wq))
+			udelay(100);
+		idxd_int_handle_revoke_drain(ie);
+	}
+	kfree(revoke);
+}
+
+static int process_misc_interrupts(struct idxd_device *idxd, u32 cause)
+{
+	struct device *dev = &idxd->pdev->dev;
+	union gensts_reg gensts;
+	u32 val = 0;
+	int i;
+	bool err = false;
+
+	if (cause & IDXD_INTC_HALT_STATE)
+		goto halt;
+
+	if (cause & IDXD_INTC_ERR) {
+		spin_lock(&idxd->dev_lock);
+		for (i = 0; i < 4; i++)
+			idxd->sw_err.bits[i] = ioread64(idxd->reg_base +
+					IDXD_SWERR_OFFSET + i * sizeof(u64));
+
+		iowrite64(idxd->sw_err.bits[0] & IDXD_SWERR_ACK,
+			  idxd->reg_base + IDXD_SWERR_OFFSET);
+
+		if (idxd->sw_err.valid && idxd->sw_err.wq_idx_valid) {
+			int id = idxd->sw_err.wq_idx;
+			struct idxd_wq *wq = idxd->wqs[id];
+
+			if (wq->type == IDXD_WQT_USER)
+				wake_up_interruptible(&wq->err_queue);
+		} else {
+			int i;
+
+			for (i = 0; i < idxd->max_wqs; i++) {
+				struct idxd_wq *wq = idxd->wqs[i];
+
+				if (wq->type == IDXD_WQT_USER)
+					wake_up_interruptible(&wq->err_queue);
+			}
+		}
+
+		spin_unlock(&idxd->dev_lock);
+		val |= IDXD_INTC_ERR;
+
+		for (i = 0; i < 4; i++)
+			dev_warn(dev, "err[%d]: %#16.16llx\n",
+				 i, idxd->sw_err.bits[i]);
+		err = true;
+	}
+
+	if (cause & IDXD_INTC_INT_HANDLE_REVOKED) {
+		struct idxd_int_handle_revoke *revoke;
+
+		val |= IDXD_INTC_INT_HANDLE_REVOKED;
+
+		revoke = kzalloc(sizeof(*revoke), GFP_ATOMIC);
+		if (revoke) {
+			revoke->idxd = idxd;
+			INIT_WORK(&revoke->work, idxd_int_handle_revoke);
+			queue_work(idxd->wq, &revoke->work);
+
+		} else {
+			dev_err(dev, "Failed to allocate work for int handle revoke\n");
+			idxd_wqs_quiesce(idxd);
+		}
+	}
+
+	if (cause & IDXD_INTC_CMD) {
+		val |= IDXD_INTC_CMD;
+		complete(idxd->cmd_done);
+	}
+
+	if (cause & IDXD_INTC_OCCUPY) {
+		/* Driver does not utilize occupancy interrupt */
+		val |= IDXD_INTC_OCCUPY;
+	}
+
+	if (cause & IDXD_INTC_PERFMON_OVFL) {
+		val |= IDXD_INTC_PERFMON_OVFL;
+		perfmon_counter_overflow(idxd);
+	}
+
+	val ^= cause;
+	if (val)
+		dev_warn_once(dev, "Unexpected interrupt cause bits set: %#x\n",
+			      val);
+
+	if (!err)
+		return 0;
+
+halt:
+	gensts.bits = ioread32(idxd->reg_base + IDXD_GENSTATS_OFFSET);
+	if (gensts.state == IDXD_DEVICE_STATE_HALT) {
+		idxd->state = IDXD_DEV_HALTED;
+		if (gensts.reset_type == IDXD_DEVICE_RESET_SOFTWARE) {
+			/*
+			 * If we need a software reset, we will throw the work
+			 * on a system workqueue in order to allow interrupts
+			 * for the device command completions.
+			 */
+			INIT_WORK(&idxd->work, idxd_device_reinit);
+			queue_work(idxd->wq, &idxd->work);
+		} else {
+			idxd->state = IDXD_DEV_HALTED;
+			idxd_wqs_quiesce(idxd);
+			idxd_wqs_unmap_portal(idxd);
+			idxd_device_clear_state(idxd);
+			dev_err(&idxd->pdev->dev,
+				"idxd halted, need %s.\n",
+				gensts.reset_type == IDXD_DEVICE_RESET_FLR ?
+				"FLR" : "system reset");
+			return -ENXIO;
+		}
+	}
+
+	return 0;
+}
+
+irqreturn_t idxd_misc_thread(int vec, void *data)
+{
+	struct idxd_irq_entry *irq_entry = data;
+	struct idxd_device *idxd = ie_to_idxd(irq_entry);
+	int rc;
+	u32 cause;
+
+	cause = ioread32(idxd->reg_base + IDXD_INTCAUSE_OFFSET);
+	if (cause)
+		iowrite32(cause, idxd->reg_base + IDXD_INTCAUSE_OFFSET);
+
+	while (cause) {
+		rc = process_misc_interrupts(idxd, cause);
+		if (rc < 0)
+			break;
+		cause = ioread32(idxd->reg_base + IDXD_INTCAUSE_OFFSET);
+		if (cause)
+			iowrite32(cause, idxd->reg_base + IDXD_INTCAUSE_OFFSET);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void idxd_int_handle_resubmit_work(struct work_struct *work)
+{
+	struct idxd_resubmit *irw = container_of(work, struct idxd_resubmit, work);
+	struct idxd_desc *desc = irw->desc;
+	struct idxd_wq *wq = desc->wq;
+	int rc;
+
+	desc->completion->status = 0;
+	rc = idxd_submit_desc(wq, desc);
+	if (rc < 0) {
+		dev_dbg(&wq->idxd->pdev->dev, "Failed to resubmit desc %d to wq %d.\n",
+			desc->id, wq->id);
+		/*
+		 * If the error is not -EAGAIN, it means the submission failed due to wq
+		 * has been killed instead of ENQCMDS failure. Here the driver needs to
+		 * notify the submitter of the failure by reporting abort status.
+		 *
+		 * -EAGAIN comes from ENQCMDS failure. idxd_submit_desc() will handle the
+		 * abort.
+		 */
+		if (rc != -EAGAIN) {
+			desc->completion->status = IDXD_COMP_DESC_ABORT;
+			idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT, false);
+		}
+		idxd_free_desc(wq, desc);
+	}
+	kfree(irw);
+}
+
+bool idxd_queue_int_handle_resubmit(struct idxd_desc *desc)
+{
+	struct idxd_wq *wq = desc->wq;
+	struct idxd_device *idxd = wq->idxd;
+	struct idxd_resubmit *irw;
+
+	irw = kzalloc(sizeof(*irw), GFP_KERNEL);
+	if (!irw)
+		return false;
+
+	irw->desc = desc;
+	INIT_WORK(&irw->work, idxd_int_handle_resubmit_work);
+	queue_work(idxd->wq, &irw->work);
+	return true;
+}
+
+static void irq_process_pending_llist(struct idxd_irq_entry *irq_entry)
+{
+	struct idxd_desc *desc, *t;
+	struct llist_node *head;
+
+	head = llist_del_all(&irq_entry->pending_llist);
+	if (!head)
+		return;
+
+	llist_for_each_entry_safe(desc, t, head, llnode) {
+		u8 status = desc->completion->status & DSA_COMP_STATUS_MASK;
+
+		if (status) {
+			/*
+			 * Check against the original status as ABORT is software defined
+			 * and 0xff, which DSA_COMP_STATUS_MASK can mask out.
+			 */
+			if (unlikely(desc->completion->status == IDXD_COMP_DESC_ABORT)) {
+				idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT, true);
+				continue;
+			}
+
+			idxd_dma_complete_txd(desc, IDXD_COMPLETE_NORMAL, true);
+		} else {
+			spin_lock(&irq_entry->list_lock);
+			list_add_tail(&desc->list,
+				      &irq_entry->work_list);
+			spin_unlock(&irq_entry->list_lock);
+		}
+	}
+}
+
+static void irq_process_work_list(struct idxd_irq_entry *irq_entry)
+{
+	LIST_HEAD(flist);
+	struct idxd_desc *desc, *n;
+
+	/*
+	 * This lock protects list corruption from access of list outside of the irq handler
+	 * thread.
+	 */
+	spin_lock(&irq_entry->list_lock);
+	if (list_empty(&irq_entry->work_list)) {
+		spin_unlock(&irq_entry->list_lock);
+		return;
+	}
+
+	list_for_each_entry_safe(desc, n, &irq_entry->work_list, list) {
+		if (desc->completion->status) {
+			list_move_tail(&desc->list, &flist);
+		}
+	}
+
+	spin_unlock(&irq_entry->list_lock);
+
+	list_for_each_entry(desc, &flist, list) {
+		/*
+		 * Check against the original status as ABORT is software defined
+		 * and 0xff, which DSA_COMP_STATUS_MASK can mask out.
+		 */
+		if (unlikely(desc->completion->status == IDXD_COMP_DESC_ABORT)) {
+			idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT, true);
+			continue;
+		}
+
+		idxd_dma_complete_txd(desc, IDXD_COMPLETE_NORMAL, true);
+	}
+}
+
+irqreturn_t idxd_wq_thread(int irq, void *data)
+{
+	struct idxd_irq_entry *irq_entry = data;
+
+	/*
+	 * There are two lists we are processing. The pending_llist is where
+	 * submmiter adds all the submitted descriptor after sending it to
+	 * the workqueue. It's a lockless singly linked list. The work_list
+	 * is the common linux double linked list. We are in a scenario of
+	 * multiple producers and a single consumer. The producers are all
+	 * the kernel submitters of descriptors, and the consumer is the
+	 * kernel irq handler thread for the msix vector when using threaded
+	 * irq. To work with the restrictions of llist to remain lockless,
+	 * we are doing the following steps:
+	 * 1. Iterate through the work_list and process any completed
+	 *    descriptor. Delete the completed entries during iteration.
+	 * 2. llist_del_all() from the pending list.
+	 * 3. Iterate through the llist that was deleted from the pending list
+	 *    and process the completed entries.
+	 * 4. If the entry is still waiting on hardware, list_add_tail() to
+	 *    the work_list.
+	 */
+	irq_process_work_list(irq_entry);
+	irq_process_pending_llist(irq_entry);
+
+	return IRQ_HANDLED;
+}