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, 686 insertions, 0 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_tmf.c b/drivers/scsi/aic94xx/aic94xx_tmf.c
new file mode 100644
index 000000000..27d32b8c2
--- /dev/null
+++ b/drivers/scsi/aic94xx/aic94xx_tmf.c
@@ -0,0 +1,686 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Aic94xx Task Management Functions
+ *
+ * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ */
+
+#include <linux/spinlock.h>
+#include <linux/gfp.h>
+#include "aic94xx.h"
+#include "aic94xx_sas.h"
+#include "aic94xx_hwi.h"
+
+/* ---------- Internal enqueue ---------- */
+
+static int asd_enqueue_internal(struct asd_ascb *ascb,
+		void (*tasklet_complete)(struct asd_ascb *,
+					 struct done_list_struct *),
+				void (*timed_out)(struct timer_list *t))
+{
+	int res;
+
+	ascb->tasklet_complete = tasklet_complete;
+	ascb->uldd_timer = 1;
+
+	ascb->timer.function = timed_out;
+	ascb->timer.expires = jiffies + AIC94XX_SCB_TIMEOUT;
+
+	add_timer(&ascb->timer);
+
+	res = asd_post_ascb_list(ascb->ha, ascb, 1);
+	if (unlikely(res))
+		del_timer(&ascb->timer);
+	return res;
+}
+
+/* ---------- CLEAR NEXUS ---------- */
+
+struct tasklet_completion_status {
+	int	dl_opcode;
+	int	tmf_state;
+	u8	tag_valid:1;
+	__be16	tag;
+};
+
+#define DECLARE_TCS(tcs) \
+	struct tasklet_completion_status tcs = { \
+		.dl_opcode = 0, \
+		.tmf_state = 0, \
+		.tag_valid = 0, \
+		.tag = 0, \
+	}
+
+
+static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
+					     struct done_list_struct *dl)
+{
+	struct tasklet_completion_status *tcs = ascb->uldd_task;
+	ASD_DPRINTK("%s: here\n", __func__);
+	if (!del_timer(&ascb->timer)) {
+		ASD_DPRINTK("%s: couldn't delete timer\n", __func__);
+		return;
+	}
+	ASD_DPRINTK("%s: opcode: 0x%x\n", __func__, dl->opcode);
+	tcs->dl_opcode = dl->opcode;
+	complete(ascb->completion);
+	asd_ascb_free(ascb);
+}
+
+static void asd_clear_nexus_timedout(struct timer_list *t)
+{
+	struct asd_ascb *ascb = from_timer(ascb, t, timer);
+	struct tasklet_completion_status *tcs = ascb->uldd_task;
+
+	ASD_DPRINTK("%s: here\n", __func__);
+	tcs->dl_opcode = TMF_RESP_FUNC_FAILED;
+	complete(ascb->completion);
+}
+
+#define CLEAR_NEXUS_PRE         \
+	struct asd_ascb *ascb; \
+	struct scb *scb; \
+	int res; \
+	DECLARE_COMPLETION_ONSTACK(completion); \
+	DECLARE_TCS(tcs); \
+		\
+	ASD_DPRINTK("%s: PRE\n", __func__); \
+        res = 1;                \
+	ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
+	if (!ascb)              \
+		return -ENOMEM; \
+                                \
+	ascb->completion = &completion; \
+	ascb->uldd_task = &tcs; \
+	scb = ascb->scb;        \
+	scb->header.opcode = CLEAR_NEXUS
+
+#define CLEAR_NEXUS_POST        \
+	ASD_DPRINTK("%s: POST\n", __func__); \
+	res = asd_enqueue_internal(ascb, asd_clear_nexus_tasklet_complete, \
+				   asd_clear_nexus_timedout);              \
+	if (res)                \
+		goto out_err;   \
+	ASD_DPRINTK("%s: clear nexus posted, waiting...\n", __func__); \
+	wait_for_completion(&completion); \
+	res = tcs.dl_opcode; \
+	if (res == TC_NO_ERROR) \
+		res = TMF_RESP_FUNC_COMPLETE;   \
+	return res; \
+out_err:                        \
+	asd_ascb_free(ascb);    \
+	return res
+
+int asd_clear_nexus_ha(struct sas_ha_struct *sas_ha)
+{
+	struct asd_ha_struct *asd_ha = sas_ha->lldd_ha;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_ADAPTER;
+	CLEAR_NEXUS_POST;
+}
+
+int asd_clear_nexus_port(struct asd_sas_port *port)
+{
+	struct asd_ha_struct *asd_ha = port->ha->lldd_ha;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_PORT;
+	scb->clear_nexus.conn_mask = port->phy_mask;
+	CLEAR_NEXUS_POST;
+}
+
+enum clear_nexus_phase {
+	NEXUS_PHASE_PRE,
+	NEXUS_PHASE_POST,
+	NEXUS_PHASE_RESUME,
+};
+
+static int asd_clear_nexus_I_T(struct domain_device *dev,
+			       enum clear_nexus_phase phase)
+{
+	struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_I_T;
+	switch (phase) {
+	case NEXUS_PHASE_PRE:
+		scb->clear_nexus.flags = EXEC_Q | SUSPEND_TX;
+		break;
+	case NEXUS_PHASE_POST:
+		scb->clear_nexus.flags = SEND_Q | NOTINQ;
+		break;
+	case NEXUS_PHASE_RESUME:
+		scb->clear_nexus.flags = RESUME_TX;
+	}
+	scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
+						   dev->lldd_dev);
+	CLEAR_NEXUS_POST;
+}
+
+int asd_I_T_nexus_reset(struct domain_device *dev)
+{
+	int res, tmp_res, i;
+	struct sas_phy *phy = sas_get_local_phy(dev);
+	/* Standard mandates link reset for ATA  (type 0) and
+	 * hard reset for SSP (type 1) */
+	int reset_type = (dev->dev_type == SAS_SATA_DEV ||
+			  (dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
+
+	asd_clear_nexus_I_T(dev, NEXUS_PHASE_PRE);
+	/* send a hard reset */
+	ASD_DPRINTK("sending %s reset to %s\n",
+		    reset_type ? "hard" : "soft", dev_name(&phy->dev));
+	res = sas_phy_reset(phy, reset_type);
+	if (res == TMF_RESP_FUNC_COMPLETE || res == -ENODEV) {
+		/* wait for the maximum settle time */
+		msleep(500);
+		/* clear all outstanding commands (keep nexus suspended) */
+		asd_clear_nexus_I_T(dev, NEXUS_PHASE_POST);
+	}
+	for (i = 0 ; i < 3; i++) {
+		tmp_res = asd_clear_nexus_I_T(dev, NEXUS_PHASE_RESUME);
+		if (tmp_res == TC_RESUME)
+			goto out;
+		msleep(500);
+	}
+
+	/* This is a bit of a problem:  the sequencer is still suspended
+	 * and is refusing to resume.  Hope it will resume on a bigger hammer
+	 * or the disk is lost */
+	dev_printk(KERN_ERR, &phy->dev,
+		   "Failed to resume nexus after reset 0x%x\n", tmp_res);
+
+	res = TMF_RESP_FUNC_FAILED;
+ out:
+	sas_put_local_phy(phy);
+	return res;
+}
+
+static int asd_clear_nexus_I_T_L(struct domain_device *dev, u8 *lun)
+{
+	struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_I_T_L;
+	scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
+	memcpy(scb->clear_nexus.ssp_task.lun, lun, 8);
+	scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
+						   dev->lldd_dev);
+	CLEAR_NEXUS_POST;
+}
+
+static int asd_clear_nexus_tag(struct sas_task *task)
+{
+	struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
+	struct asd_ascb *tascb = task->lldd_task;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_TAG;
+	memcpy(scb->clear_nexus.ssp_task.lun, task->ssp_task.LUN, 8);
+	scb->clear_nexus.ssp_task.tag = tascb->tag;
+	if (task->dev->tproto)
+		scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
+							  task->dev->lldd_dev);
+	CLEAR_NEXUS_POST;
+}
+
+static int asd_clear_nexus_index(struct sas_task *task)
+{
+	struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
+	struct asd_ascb *tascb = task->lldd_task;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_TRANS_CX;
+	if (task->dev->tproto)
+		scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
+							  task->dev->lldd_dev);
+	scb->clear_nexus.index = cpu_to_le16(tascb->tc_index);
+	CLEAR_NEXUS_POST;
+}
+
+/* ---------- TMFs ---------- */
+
+static void asd_tmf_timedout(struct timer_list *t)
+{
+	struct asd_ascb *ascb = from_timer(ascb, t, timer);
+	struct tasklet_completion_status *tcs = ascb->uldd_task;
+
+	ASD_DPRINTK("tmf timed out\n");
+	tcs->tmf_state = TMF_RESP_FUNC_FAILED;
+	complete(ascb->completion);
+}
+
+static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
+				    struct done_list_struct *dl)
+{
+	struct asd_ha_struct *asd_ha = ascb->ha;
+	unsigned long flags;
+	struct tc_resp_sb_struct {
+		__le16 index_escb;
+		u8     len_lsb;
+		u8     flags;
+	} __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
+
+	int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
+	struct asd_ascb *escb;
+	struct asd_dma_tok *edb;
+	struct ssp_frame_hdr *fh;
+	struct ssp_response_iu   *ru;
+	int res = TMF_RESP_FUNC_FAILED;
+
+	ASD_DPRINTK("tmf resp tasklet\n");
+
+	spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
+	escb = asd_tc_index_find(&asd_ha->seq,
+				 (int)le16_to_cpu(resp_sb->index_escb));
+	spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
+
+	if (!escb) {
+		ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
+		return res;
+	}
+
+	edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
+	ascb->tag = *(__be16 *)(edb->vaddr+4);
+	fh = edb->vaddr + 16;
+	ru = edb->vaddr + 16 + sizeof(*fh);
+	res = ru->status;
+	if (ru->datapres == SAS_DATAPRES_RESPONSE_DATA)
+		res = ru->resp_data[3];
+#if 0
+	ascb->tag = fh->tag;
+#endif
+	ascb->tag_valid = 1;
+
+	asd_invalidate_edb(escb, edb_id);
+	return res;
+}
+
+static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
+				     struct done_list_struct *dl)
+{
+	struct tasklet_completion_status *tcs;
+
+	if (!del_timer(&ascb->timer))
+		return;
+
+	tcs = ascb->uldd_task;
+	ASD_DPRINTK("tmf tasklet complete\n");
+
+	tcs->dl_opcode = dl->opcode;
+
+	if (dl->opcode == TC_SSP_RESP) {
+		tcs->tmf_state = asd_get_tmf_resp_tasklet(ascb, dl);
+		tcs->tag_valid = ascb->tag_valid;
+		tcs->tag = ascb->tag;
+	}
+
+	complete(ascb->completion);
+	asd_ascb_free(ascb);
+}
+
+static int asd_clear_nexus(struct sas_task *task)
+{
+	int res = TMF_RESP_FUNC_FAILED;
+	int leftover;
+	struct asd_ascb *tascb = task->lldd_task;
+	DECLARE_COMPLETION_ONSTACK(completion);
+	unsigned long flags;
+
+	tascb->completion = &completion;
+
+	ASD_DPRINTK("task not done, clearing nexus\n");
+	if (tascb->tag_valid)
+		res = asd_clear_nexus_tag(task);
+	else
+		res = asd_clear_nexus_index(task);
+	leftover = wait_for_completion_timeout(&completion,
+					       AIC94XX_SCB_TIMEOUT);
+	tascb->completion = NULL;
+	ASD_DPRINTK("came back from clear nexus\n");
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (leftover < 1)
+		res = TMF_RESP_FUNC_FAILED;
+	if (task->task_state_flags & SAS_TASK_STATE_DONE)
+		res = TMF_RESP_FUNC_COMPLETE;
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	return res;
+}
+
+/**
+ * asd_abort_task -- ABORT TASK TMF
+ * @task: the task to be aborted
+ *
+ * Before calling ABORT TASK the task state flags should be ORed with
+ * SAS_TASK_STATE_ABORTED (unless SAS_TASK_STATE_DONE is set) under
+ * the task_state_lock IRQ spinlock, then ABORT TASK *must* be called.
+ *
+ * Implements the ABORT TASK TMF, I_T_L_Q nexus.
+ * Returns: SAS TMF responses (see sas_task.h),
+ *          -ENOMEM,
+ *          -SAS_QUEUE_FULL.
+ *
+ * When ABORT TASK returns, the caller of ABORT TASK checks first the
+ * task->task_state_flags, and then the return value of ABORT TASK.
+ *
+ * If the task has task state bit SAS_TASK_STATE_DONE set, then the
+ * task was completed successfully prior to it being aborted.  The
+ * caller of ABORT TASK has responsibility to call task->task_done()
+ * xor free the task, depending on their framework.  The return code
+ * is TMF_RESP_FUNC_FAILED in this case.
+ *
+ * Else the SAS_TASK_STATE_DONE bit is not set,
+ * 	If the return code is TMF_RESP_FUNC_COMPLETE, then
+ * 		the task was aborted successfully.  The caller of
+ * 		ABORT TASK has responsibility to call task->task_done()
+ *              to finish the task, xor free the task depending on their
+ *		framework.
+ *	else
+ * 		the ABORT TASK returned some kind of error. The task
+ *              was _not_ cancelled.  Nothing can be assumed.
+ *		The caller of ABORT TASK may wish to retry.
+ */
+int asd_abort_task(struct sas_task *task)
+{
+	struct asd_ascb *tascb = task->lldd_task;
+	struct asd_ha_struct *asd_ha = tascb->ha;
+	int res = 1;
+	unsigned long flags;
+	struct asd_ascb *ascb = NULL;
+	struct scb *scb;
+	int leftover;
+	DECLARE_TCS(tcs);
+	DECLARE_COMPLETION_ONSTACK(completion);
+	DECLARE_COMPLETION_ONSTACK(tascb_completion);
+
+	tascb->completion = &tascb_completion;
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		res = TMF_RESP_FUNC_COMPLETE;
+		ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
+		goto out_done;
+	}
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
+	if (!ascb)
+		return -ENOMEM;
+
+	ascb->uldd_task = &tcs;
+	ascb->completion = &completion;
+	scb = ascb->scb;
+	scb->header.opcode = SCB_ABORT_TASK;
+
+	switch (task->task_proto) {
+	case SAS_PROTOCOL_SATA:
+	case SAS_PROTOCOL_STP:
+		scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
+		break;
+	case SAS_PROTOCOL_SSP:
+		scb->abort_task.proto_conn_rate  = (1 << 4); /* SSP */
+		scb->abort_task.proto_conn_rate |= task->dev->linkrate;
+		break;
+	case SAS_PROTOCOL_SMP:
+		break;
+	default:
+		break;
+	}
+
+	if (task->task_proto == SAS_PROTOCOL_SSP) {
+		scb->abort_task.ssp_frame.frame_type = SSP_TASK;
+		memcpy(scb->abort_task.ssp_frame.hashed_dest_addr,
+		       task->dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
+		memcpy(scb->abort_task.ssp_frame.hashed_src_addr,
+		       task->dev->port->ha->hashed_sas_addr,
+		       HASHED_SAS_ADDR_SIZE);
+		scb->abort_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
+
+		memcpy(scb->abort_task.ssp_task.lun, task->ssp_task.LUN, 8);
+		scb->abort_task.ssp_task.tmf = TMF_ABORT_TASK;
+		scb->abort_task.ssp_task.tag = cpu_to_be16(0xFFFF);
+	}
+
+	scb->abort_task.sister_scb = cpu_to_le16(0xFFFF);
+	scb->abort_task.conn_handle = cpu_to_le16(
+		(u16)(unsigned long)task->dev->lldd_dev);
+	scb->abort_task.retry_count = 1;
+	scb->abort_task.index = cpu_to_le16((u16)tascb->tc_index);
+	scb->abort_task.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
+
+	res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
+				   asd_tmf_timedout);
+	if (res)
+		goto out_free;
+	wait_for_completion(&completion);
+	ASD_DPRINTK("tmf came back\n");
+
+	tascb->tag = tcs.tag;
+	tascb->tag_valid = tcs.tag_valid;
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		res = TMF_RESP_FUNC_COMPLETE;
+		ASD_DPRINTK("%s: task 0x%p done\n", __func__, task);
+		goto out_done;
+	}
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	if (tcs.dl_opcode == TC_SSP_RESP) {
+		/* The task to be aborted has been sent to the device.
+		 * We got a Response IU for the ABORT TASK TMF. */
+		if (tcs.tmf_state == TMF_RESP_FUNC_COMPLETE)
+			res = asd_clear_nexus(task);
+		else
+			res = tcs.tmf_state;
+	} else if (tcs.dl_opcode == TC_NO_ERROR &&
+		   tcs.tmf_state == TMF_RESP_FUNC_FAILED) {
+		/* timeout */
+		res = TMF_RESP_FUNC_FAILED;
+	} else {
+		/* In the following we assume that the managing layer
+		 * will _never_ make a mistake, when issuing ABORT
+		 * TASK.
+		 */
+		switch (tcs.dl_opcode) {
+		default:
+			res = asd_clear_nexus(task);
+			fallthrough;
+		case TC_NO_ERROR:
+			break;
+			/* The task hasn't been sent to the device xor
+			 * we never got a (sane) Response IU for the
+			 * ABORT TASK TMF.
+			 */
+		case TF_NAK_RECV:
+			res = TMF_RESP_INVALID_FRAME;
+			break;
+		case TF_TMF_TASK_DONE:	/* done but not reported yet */
+			res = TMF_RESP_FUNC_FAILED;
+			leftover =
+				wait_for_completion_timeout(&tascb_completion,
+							  AIC94XX_SCB_TIMEOUT);
+			spin_lock_irqsave(&task->task_state_lock, flags);
+			if (leftover < 1)
+				res = TMF_RESP_FUNC_FAILED;
+			if (task->task_state_flags & SAS_TASK_STATE_DONE)
+				res = TMF_RESP_FUNC_COMPLETE;
+			spin_unlock_irqrestore(&task->task_state_lock, flags);
+			break;
+		case TF_TMF_NO_TAG:
+		case TF_TMF_TAG_FREE: /* the tag is in the free list */
+		case TF_TMF_NO_CONN_HANDLE: /* no such device */
+			res = TMF_RESP_FUNC_COMPLETE;
+			break;
+		case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
+			res = TMF_RESP_FUNC_ESUPP;
+			break;
+		}
+	}
+ out_done:
+	tascb->completion = NULL;
+	if (res == TMF_RESP_FUNC_COMPLETE) {
+		task->lldd_task = NULL;
+		mb();
+		asd_ascb_free(tascb);
+	}
+	ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
+	return res;
+
+ out_free:
+	asd_ascb_free(ascb);
+	ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
+	return res;
+}
+
+/**
+ * asd_initiate_ssp_tmf -- send a TMF to an I_T_L or I_T_L_Q nexus
+ * @dev: pointer to struct domain_device of interest
+ * @lun: pointer to u8[8] which is the LUN
+ * @tmf: the TMF to be performed (see sas_task.h or the SAS spec)
+ * @index: the transaction context of the task to be queried if QT TMF
+ *
+ * This function is used to send ABORT TASK SET, CLEAR ACA,
+ * CLEAR TASK SET, LU RESET and QUERY TASK TMFs.
+ *
+ * No SCBs should be queued to the I_T_L nexus when this SCB is
+ * pending.
+ *
+ * Returns: TMF response code (see sas_task.h or the SAS spec)
+ */
+static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
+				int tmf, int index)
+{
+	struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
+	struct asd_ascb *ascb;
+	int res = 1;
+	struct scb *scb;
+	DECLARE_COMPLETION_ONSTACK(completion);
+	DECLARE_TCS(tcs);
+
+	if (!(dev->tproto & SAS_PROTOCOL_SSP))
+		return TMF_RESP_FUNC_ESUPP;
+
+	ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
+	if (!ascb)
+		return -ENOMEM;
+
+	ascb->completion = &completion;
+	ascb->uldd_task = &tcs;
+	scb = ascb->scb;
+
+	if (tmf == TMF_QUERY_TASK)
+		scb->header.opcode = QUERY_SSP_TASK;
+	else
+		scb->header.opcode = INITIATE_SSP_TMF;
+
+	scb->ssp_tmf.proto_conn_rate  = (1 << 4); /* SSP */
+	scb->ssp_tmf.proto_conn_rate |= dev->linkrate;
+	/* SSP frame header */
+	scb->ssp_tmf.ssp_frame.frame_type = SSP_TASK;
+	memcpy(scb->ssp_tmf.ssp_frame.hashed_dest_addr,
+	       dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
+	memcpy(scb->ssp_tmf.ssp_frame.hashed_src_addr,
+	       dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
+	scb->ssp_tmf.ssp_frame.tptt = cpu_to_be16(0xFFFF);
+	/* SSP Task IU */
+	memcpy(scb->ssp_tmf.ssp_task.lun, lun, 8);
+	scb->ssp_tmf.ssp_task.tmf = tmf;
+
+	scb->ssp_tmf.sister_scb = cpu_to_le16(0xFFFF);
+	scb->ssp_tmf.conn_handle= cpu_to_le16((u16)(unsigned long)
+					      dev->lldd_dev);
+	scb->ssp_tmf.retry_count = 1;
+	scb->ssp_tmf.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
+	if (tmf == TMF_QUERY_TASK)
+		scb->ssp_tmf.index = cpu_to_le16(index);
+
+	res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
+				   asd_tmf_timedout);
+	if (res)
+		goto out_err;
+	wait_for_completion(&completion);
+
+	switch (tcs.dl_opcode) {
+	case TC_NO_ERROR:
+		res = TMF_RESP_FUNC_COMPLETE;
+		break;
+	case TF_NAK_RECV:
+		res = TMF_RESP_INVALID_FRAME;
+		break;
+	case TF_TMF_TASK_DONE:
+		res = TMF_RESP_FUNC_FAILED;
+		break;
+	case TF_TMF_NO_TAG:
+	case TF_TMF_TAG_FREE: /* the tag is in the free list */
+	case TF_TMF_NO_CONN_HANDLE: /* no such device */
+		res = TMF_RESP_FUNC_COMPLETE;
+		break;
+	case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
+		res = TMF_RESP_FUNC_ESUPP;
+		break;
+	default:
+		/* Allow TMF response codes to propagate upwards */
+		res = tcs.dl_opcode;
+		break;
+	}
+	return res;
+out_err:
+	asd_ascb_free(ascb);
+	return res;
+}
+
+int asd_abort_task_set(struct domain_device *dev, u8 *lun)
+{
+	int res = asd_initiate_ssp_tmf(dev, lun, TMF_ABORT_TASK_SET, 0);
+
+	if (res == TMF_RESP_FUNC_COMPLETE)
+		asd_clear_nexus_I_T_L(dev, lun);
+	return res;
+}
+
+int asd_clear_task_set(struct domain_device *dev, u8 *lun)
+{
+	int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_TASK_SET, 0);
+
+	if (res == TMF_RESP_FUNC_COMPLETE)
+		asd_clear_nexus_I_T_L(dev, lun);
+	return res;
+}
+
+int asd_lu_reset(struct domain_device *dev, u8 *lun)
+{
+	int res = asd_initiate_ssp_tmf(dev, lun, TMF_LU_RESET, 0);
+
+	if (res == TMF_RESP_FUNC_COMPLETE)
+		asd_clear_nexus_I_T_L(dev, lun);
+	return res;
+}
+
+/**
+ * asd_query_task -- send a QUERY TASK TMF to an I_T_L_Q nexus
+ * @task: pointer to sas_task struct of interest
+ *
+ * Returns: TMF_RESP_FUNC_COMPLETE if the task is not in the task set,
+ * or TMF_RESP_FUNC_SUCC if the task is in the task set.
+ *
+ * Normally the management layer sets the task to aborted state,
+ * and then calls query task and then abort task.
+ */
+int asd_query_task(struct sas_task *task)
+{
+	struct asd_ascb *ascb = task->lldd_task;
+	int index;
+
+	if (ascb) {
+		index = ascb->tc_index;
+		return asd_initiate_ssp_tmf(task->dev, task->ssp_task.LUN,
+					    TMF_QUERY_TASK, index);
+	}
+	return TMF_RESP_FUNC_COMPLETE;
+}