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, 912 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
new file mode 100644
index 000000000..5e80225b5
--- /dev/null
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -0,0 +1,912 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Support for SATA devices on Serial Attached SCSI (SAS) controllers
+ *
+ * Copyright (C) 2006 IBM Corporation
+ *
+ * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
+ */
+
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/async.h>
+#include <linux/export.h>
+
+#include <scsi/sas_ata.h>
+#include "sas_internal.h"
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+#include "scsi_sas_internal.h"
+#include "scsi_transport_api.h"
+#include <scsi/scsi_eh.h>
+
+static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
+{
+	/* Cheesy attempt to translate SAS errors into ATA.  Hah! */
+
+	/* transport error */
+	if (ts->resp == SAS_TASK_UNDELIVERED)
+		return AC_ERR_ATA_BUS;
+
+	/* ts->resp == SAS_TASK_COMPLETE */
+	/* task delivered, what happened afterwards? */
+	switch (ts->stat) {
+	case SAS_DEV_NO_RESPONSE:
+		return AC_ERR_TIMEOUT;
+	case SAS_INTERRUPTED:
+	case SAS_PHY_DOWN:
+	case SAS_NAK_R_ERR:
+		return AC_ERR_ATA_BUS;
+	case SAS_DATA_UNDERRUN:
+		/*
+		 * Some programs that use the taskfile interface
+		 * (smartctl in particular) can cause underrun
+		 * problems.  Ignore these errors, perhaps at our
+		 * peril.
+		 */
+		return 0;
+	case SAS_DATA_OVERRUN:
+	case SAS_QUEUE_FULL:
+	case SAS_DEVICE_UNKNOWN:
+	case SAS_OPEN_TO:
+	case SAS_OPEN_REJECT:
+		pr_warn("%s: Saw error %d.  What to do?\n",
+			__func__, ts->stat);
+		return AC_ERR_OTHER;
+	case SAM_STAT_CHECK_CONDITION:
+	case SAS_ABORTED_TASK:
+		return AC_ERR_DEV;
+	case SAS_PROTO_RESPONSE:
+		/* This means the ending_fis has the error
+		 * value; return 0 here to collect it
+		 */
+		return 0;
+	default:
+		return 0;
+	}
+}
+
+static void sas_ata_task_done(struct sas_task *task)
+{
+	struct ata_queued_cmd *qc = task->uldd_task;
+	struct domain_device *dev = task->dev;
+	struct task_status_struct *stat = &task->task_status;
+	struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
+	struct sas_ha_struct *sas_ha = dev->port->ha;
+	enum ata_completion_errors ac;
+	unsigned long flags;
+	struct ata_link *link;
+	struct ata_port *ap;
+
+	spin_lock_irqsave(&dev->done_lock, flags);
+	if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
+		task = NULL;
+	else if (qc && qc->scsicmd)
+		ASSIGN_SAS_TASK(qc->scsicmd, NULL);
+	spin_unlock_irqrestore(&dev->done_lock, flags);
+
+	/* check if libsas-eh got to the task before us */
+	if (unlikely(!task))
+		return;
+
+	if (!qc)
+		goto qc_already_gone;
+
+	ap = qc->ap;
+	link = &ap->link;
+
+	spin_lock_irqsave(ap->lock, flags);
+	/* check if we lost the race with libata/sas_ata_post_internal() */
+	if (unlikely(ata_port_is_frozen(ap))) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		if (qc->scsicmd)
+			goto qc_already_gone;
+		else {
+			/* if eh is not involved and the port is frozen then the
+			 * ata internal abort process has taken responsibility
+			 * for this sas_task
+			 */
+			return;
+		}
+	}
+
+	if (stat->stat == SAS_PROTO_RESPONSE ||
+	    stat->stat == SAS_SAM_STAT_GOOD ||
+	    (stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
+	      dev->sata_dev.class == ATA_DEV_ATAPI)) {
+		memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
+
+		if (!link->sactive) {
+			qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
+		} else {
+			link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
+			if (unlikely(link->eh_info.err_mask))
+				qc->flags |= ATA_QCFLAG_FAILED;
+		}
+	} else {
+		ac = sas_to_ata_err(stat);
+		if (ac) {
+			pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
+			/* We saw a SAS error. Send a vague error. */
+			if (!link->sactive) {
+				qc->err_mask = ac;
+			} else {
+				link->eh_info.err_mask |= AC_ERR_DEV;
+				qc->flags |= ATA_QCFLAG_FAILED;
+			}
+
+			dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
+			dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
+		}
+	}
+
+	qc->lldd_task = NULL;
+	ata_qc_complete(qc);
+	spin_unlock_irqrestore(ap->lock, flags);
+
+qc_already_gone:
+	sas_free_task(task);
+}
+
+static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
+	__must_hold(ap->lock)
+{
+	struct sas_task *task;
+	struct scatterlist *sg;
+	int ret = AC_ERR_SYSTEM;
+	unsigned int si, xfer = 0;
+	struct ata_port *ap = qc->ap;
+	struct domain_device *dev = ap->private_data;
+	struct sas_ha_struct *sas_ha = dev->port->ha;
+	struct Scsi_Host *host = sas_ha->core.shost;
+	struct sas_internal *i = to_sas_internal(host->transportt);
+
+	/* TODO: we should try to remove that unlock */
+	spin_unlock(ap->lock);
+
+	/* If the device fell off, no sense in issuing commands */
+	if (test_bit(SAS_DEV_GONE, &dev->state))
+		goto out;
+
+	task = sas_alloc_task(GFP_ATOMIC);
+	if (!task)
+		goto out;
+	task->dev = dev;
+	task->task_proto = SAS_PROTOCOL_STP;
+	task->task_done = sas_ata_task_done;
+
+	/* For NCQ commands, zero out the tag libata assigned us */
+	if (ata_is_ncq(qc->tf.protocol))
+		qc->tf.nsect = 0;
+
+	ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
+	task->uldd_task = qc;
+	if (ata_is_atapi(qc->tf.protocol)) {
+		memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
+		task->total_xfer_len = qc->nbytes;
+		task->num_scatter = qc->n_elem;
+		task->data_dir = qc->dma_dir;
+	} else if (!ata_is_data(qc->tf.protocol)) {
+		task->data_dir = DMA_NONE;
+	} else {
+		for_each_sg(qc->sg, sg, qc->n_elem, si)
+			xfer += sg_dma_len(sg);
+
+		task->total_xfer_len = xfer;
+		task->num_scatter = si;
+		task->data_dir = qc->dma_dir;
+	}
+	task->scatter = qc->sg;
+	task->ata_task.retry_count = 1;
+	qc->lldd_task = task;
+
+	task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
+	task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
+
+	if (qc->scsicmd)
+		ASSIGN_SAS_TASK(qc->scsicmd, task);
+
+	ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
+	if (ret) {
+		pr_debug("lldd_execute_task returned: %d\n", ret);
+
+		if (qc->scsicmd)
+			ASSIGN_SAS_TASK(qc->scsicmd, NULL);
+		sas_free_task(task);
+		qc->lldd_task = NULL;
+		ret = AC_ERR_SYSTEM;
+	}
+
+ out:
+	spin_lock(ap->lock);
+	return ret;
+}
+
+static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
+{
+	struct domain_device *dev = qc->ap->private_data;
+
+	ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
+	return true;
+}
+
+static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
+{
+	return to_sas_internal(dev->port->ha->core.shost->transportt);
+}
+
+static int sas_get_ata_command_set(struct domain_device *dev);
+
+int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
+{
+	if (phy->attached_tproto & SAS_PROTOCOL_STP)
+		dev->tproto = phy->attached_tproto;
+	if (phy->attached_sata_dev)
+		dev->tproto |= SAS_SATA_DEV;
+
+	if (phy->attached_dev_type == SAS_SATA_PENDING)
+		dev->dev_type = SAS_SATA_PENDING;
+	else {
+		int res;
+
+		dev->dev_type = SAS_SATA_DEV;
+		res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
+					      &dev->sata_dev.rps_resp);
+		if (res) {
+			pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
+				 SAS_ADDR(dev->parent->sas_addr),
+				 phy->phy_id, res);
+			return res;
+		}
+		memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
+		       sizeof(struct dev_to_host_fis));
+		dev->sata_dev.class = sas_get_ata_command_set(dev);
+	}
+	return 0;
+}
+
+static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
+{
+	int res;
+
+	/* we weren't pending, so successfully end the reset sequence now */
+	if (dev->dev_type != SAS_SATA_PENDING)
+		return 1;
+
+	/* hmmm, if this succeeds do we need to repost the domain_device to the
+	 * lldd so it can pick up new parameters?
+	 */
+	res = sas_get_ata_info(dev, phy);
+	if (res)
+		return 0; /* retry */
+	else
+		return 1;
+}
+
+int smp_ata_check_ready_type(struct ata_link *link)
+{
+	struct domain_device *dev = link->ap->private_data;
+	struct sas_phy *phy = sas_get_local_phy(dev);
+	struct domain_device *ex_dev = dev->parent;
+	enum sas_device_type type = SAS_PHY_UNUSED;
+	u8 sas_addr[SAS_ADDR_SIZE];
+	int res;
+
+	res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type);
+	sas_put_local_phy(phy);
+	if (res)
+		return res;
+
+	switch (type) {
+	case SAS_SATA_PENDING:
+		return 0;
+	case SAS_END_DEVICE:
+		return 1;
+	default:
+		return -ENODEV;
+	}
+}
+EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
+
+static int smp_ata_check_ready(struct ata_link *link)
+{
+	int res;
+	struct ata_port *ap = link->ap;
+	struct domain_device *dev = ap->private_data;
+	struct domain_device *ex_dev = dev->parent;
+	struct sas_phy *phy = sas_get_local_phy(dev);
+	struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
+
+	res = sas_ex_phy_discover(ex_dev, phy->number);
+	sas_put_local_phy(phy);
+
+	/* break the wait early if the expander is unreachable,
+	 * otherwise keep polling
+	 */
+	if (res == -ECOMM)
+		return res;
+	if (res != SMP_RESP_FUNC_ACC)
+		return 0;
+
+	switch (ex_phy->attached_dev_type) {
+	case SAS_SATA_PENDING:
+		return 0;
+	case SAS_END_DEVICE:
+		if (ex_phy->attached_sata_dev)
+			return sas_ata_clear_pending(dev, ex_phy);
+		fallthrough;
+	default:
+		return -ENODEV;
+	}
+}
+
+static int local_ata_check_ready(struct ata_link *link)
+{
+	struct ata_port *ap = link->ap;
+	struct domain_device *dev = ap->private_data;
+	struct sas_internal *i = dev_to_sas_internal(dev);
+
+	if (i->dft->lldd_ata_check_ready)
+		return i->dft->lldd_ata_check_ready(dev);
+	else {
+		/* lldd's that don't implement 'ready' checking get the
+		 * old default behavior of not coordinating reset
+		 * recovery with libata
+		 */
+		return 1;
+	}
+}
+
+static int sas_ata_printk(const char *level, const struct domain_device *ddev,
+			  const char *fmt, ...)
+{
+	struct ata_port *ap = ddev->sata_dev.ap;
+	struct device *dev = &ddev->rphy->dev;
+	struct va_format vaf;
+	va_list args;
+	int r;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	r = printk("%s" SAS_FMT "ata%u: %s: %pV",
+		   level, ap->print_id, dev_name(dev), &vaf);
+
+	va_end(args);
+
+	return r;
+}
+
+static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
+{
+	struct sata_device *sata_dev = &dev->sata_dev;
+	int (*check_ready)(struct ata_link *link);
+	struct ata_port *ap = sata_dev->ap;
+	struct ata_link *link = &ap->link;
+	struct sas_phy *phy;
+	int ret;
+
+	phy = sas_get_local_phy(dev);
+	if (scsi_is_sas_phy_local(phy))
+		check_ready = local_ata_check_ready;
+	else
+		check_ready = smp_ata_check_ready;
+	sas_put_local_phy(phy);
+
+	ret = ata_wait_after_reset(link, deadline, check_ready);
+	if (ret && ret != -EAGAIN)
+		sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
+
+	return ret;
+}
+
+static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
+			      unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct domain_device *dev = ap->private_data;
+	struct sas_internal *i = dev_to_sas_internal(dev);
+	int ret;
+
+	ret = i->dft->lldd_I_T_nexus_reset(dev);
+	if (ret == -ENODEV)
+		return ret;
+
+	if (ret != TMF_RESP_FUNC_COMPLETE)
+		sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
+
+	ret = sas_ata_wait_after_reset(dev, deadline);
+
+	*class = dev->sata_dev.class;
+
+	ap->cbl = ATA_CBL_SATA;
+	return ret;
+}
+
+/*
+ * notify the lldd to forget the sas_task for this internal ata command
+ * that bypasses scsi-eh
+ */
+static void sas_ata_internal_abort(struct sas_task *task)
+{
+	struct sas_internal *si = dev_to_sas_internal(task->dev);
+	unsigned long flags;
+	int res;
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
+	    task->task_state_flags & SAS_TASK_STATE_DONE) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		pr_debug("%s: Task %p already finished.\n", __func__, task);
+		goto out;
+	}
+	task->task_state_flags |= SAS_TASK_STATE_ABORTED;
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	res = si->dft->lldd_abort_task(task);
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_STATE_DONE ||
+	    res == TMF_RESP_FUNC_COMPLETE) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		goto out;
+	}
+
+	/* XXX we are not prepared to deal with ->lldd_abort_task()
+	 * failures.  TODO: lldds need to unconditionally forget about
+	 * aborted ata tasks, otherwise we (likely) leak the sas task
+	 * here
+	 */
+	pr_warn("%s: Task %p leaked.\n", __func__, task);
+
+	if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
+		task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	return;
+ out:
+	sas_free_task(task);
+}
+
+static void sas_ata_post_internal(struct ata_queued_cmd *qc)
+{
+	if (qc->flags & ATA_QCFLAG_FAILED)
+		qc->err_mask |= AC_ERR_OTHER;
+
+	if (qc->err_mask) {
+		/*
+		 * Find the sas_task and kill it.  By this point, libata
+		 * has decided to kill the qc and has frozen the port.
+		 * In this state sas_ata_task_done() will no longer free
+		 * the sas_task, so we need to notify the lldd (via
+		 * ->lldd_abort_task) that the task is dead and free it
+		 *  ourselves.
+		 */
+		struct sas_task *task = qc->lldd_task;
+
+		qc->lldd_task = NULL;
+		if (!task)
+			return;
+		task->uldd_task = NULL;
+		sas_ata_internal_abort(task);
+	}
+}
+
+
+static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
+{
+	struct domain_device *dev = ap->private_data;
+	struct sas_internal *i = dev_to_sas_internal(dev);
+
+	if (i->dft->lldd_ata_set_dmamode)
+		i->dft->lldd_ata_set_dmamode(dev);
+}
+
+static void sas_ata_sched_eh(struct ata_port *ap)
+{
+	struct domain_device *dev = ap->private_data;
+	struct sas_ha_struct *ha = dev->port->ha;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ha->lock, flags);
+	if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
+		ha->eh_active++;
+	ata_std_sched_eh(ap);
+	spin_unlock_irqrestore(&ha->lock, flags);
+}
+
+void sas_ata_end_eh(struct ata_port *ap)
+{
+	struct domain_device *dev = ap->private_data;
+	struct sas_ha_struct *ha = dev->port->ha;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ha->lock, flags);
+	if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
+		ha->eh_active--;
+	spin_unlock_irqrestore(&ha->lock, flags);
+}
+
+static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct domain_device *dev = ap->private_data;
+	struct sas_phy *local_phy = sas_get_local_phy(dev);
+	int res = 0;
+
+	if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
+		res = -ENOENT;
+	sas_put_local_phy(local_phy);
+
+	return res;
+}
+
+static struct ata_port_operations sas_sata_ops = {
+	.prereset		= sas_ata_prereset,
+	.hardreset		= sas_ata_hard_reset,
+	.error_handler		= ata_std_error_handler,
+	.post_internal_cmd	= sas_ata_post_internal,
+	.qc_defer               = ata_std_qc_defer,
+	.qc_prep		= ata_noop_qc_prep,
+	.qc_issue		= sas_ata_qc_issue,
+	.qc_fill_rtf		= sas_ata_qc_fill_rtf,
+	.port_start		= ata_sas_port_start,
+	.port_stop		= ata_sas_port_stop,
+	.set_dmamode		= sas_ata_set_dmamode,
+	.sched_eh		= sas_ata_sched_eh,
+	.end_eh			= sas_ata_end_eh,
+};
+
+static struct ata_port_info sata_port_info = {
+	.flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
+		 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
+	.pio_mask = ATA_PIO4,
+	.mwdma_mask = ATA_MWDMA2,
+	.udma_mask = ATA_UDMA6,
+	.port_ops = &sas_sata_ops
+};
+
+int sas_ata_init(struct domain_device *found_dev)
+{
+	struct sas_ha_struct *ha = found_dev->port->ha;
+	struct Scsi_Host *shost = ha->core.shost;
+	struct ata_host *ata_host;
+	struct ata_port *ap;
+	int rc;
+
+	ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
+	if (!ata_host)	{
+		pr_err("ata host alloc failed.\n");
+		return -ENOMEM;
+	}
+
+	ata_host_init(ata_host, ha->dev, &sas_sata_ops);
+
+	ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
+	if (!ap) {
+		pr_err("ata_sas_port_alloc failed.\n");
+		rc = -ENODEV;
+		goto free_host;
+	}
+
+	ap->private_data = found_dev;
+	ap->cbl = ATA_CBL_SATA;
+	ap->scsi_host = shost;
+	rc = ata_sas_port_init(ap);
+	if (rc)
+		goto destroy_port;
+
+	rc = ata_sas_tport_add(ata_host->dev, ap);
+	if (rc)
+		goto destroy_port;
+
+	found_dev->sata_dev.ata_host = ata_host;
+	found_dev->sata_dev.ap = ap;
+
+	return 0;
+
+destroy_port:
+	ata_sas_port_destroy(ap);
+free_host:
+	ata_host_put(ata_host);
+	return rc;
+}
+
+void sas_ata_task_abort(struct sas_task *task)
+{
+	struct ata_queued_cmd *qc = task->uldd_task;
+	struct completion *waiting;
+
+	/* Bounce SCSI-initiated commands to the SCSI EH */
+	if (qc->scsicmd) {
+		blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
+		return;
+	}
+
+	/* Internal command, fake a timeout and complete. */
+	qc->flags &= ~ATA_QCFLAG_ACTIVE;
+	qc->flags |= ATA_QCFLAG_FAILED;
+	qc->err_mask |= AC_ERR_TIMEOUT;
+	waiting = qc->private_data;
+	complete(waiting);
+}
+
+static int sas_get_ata_command_set(struct domain_device *dev)
+{
+	struct dev_to_host_fis *fis =
+		(struct dev_to_host_fis *) dev->frame_rcvd;
+	struct ata_taskfile tf;
+
+	if (dev->dev_type == SAS_SATA_PENDING)
+		return ATA_DEV_UNKNOWN;
+
+	ata_tf_from_fis((const u8 *)fis, &tf);
+
+	return ata_dev_classify(&tf);
+}
+
+void sas_probe_sata(struct asd_sas_port *port)
+{
+	struct domain_device *dev, *n;
+
+	mutex_lock(&port->ha->disco_mutex);
+	list_for_each_entry(dev, &port->disco_list, disco_list_node) {
+		if (!dev_is_sata(dev))
+			continue;
+
+		ata_sas_async_probe(dev->sata_dev.ap);
+	}
+	mutex_unlock(&port->ha->disco_mutex);
+
+	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
+		if (!dev_is_sata(dev))
+			continue;
+
+		sas_ata_wait_eh(dev);
+
+		/* if libata could not bring the link up, don't surface
+		 * the device
+		 */
+		if (!ata_dev_enabled(sas_to_ata_dev(dev)))
+			sas_fail_probe(dev, __func__, -ENODEV);
+	}
+
+}
+
+static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
+{
+	struct domain_device *dev, *n;
+
+	list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
+		if (!dev_is_sata(dev))
+			continue;
+
+		sas_ata_wait_eh(dev);
+
+		/* if libata failed to power manage the device, tear it down */
+		if (ata_dev_disabled(sas_to_ata_dev(dev)))
+			sas_fail_probe(dev, func, -ENODEV);
+	}
+}
+
+void sas_suspend_sata(struct asd_sas_port *port)
+{
+	struct domain_device *dev;
+
+	mutex_lock(&port->ha->disco_mutex);
+	list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+		struct sata_device *sata;
+
+		if (!dev_is_sata(dev))
+			continue;
+
+		sata = &dev->sata_dev;
+		if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
+			continue;
+
+		ata_sas_port_suspend(sata->ap);
+	}
+	mutex_unlock(&port->ha->disco_mutex);
+
+	sas_ata_flush_pm_eh(port, __func__);
+}
+
+void sas_resume_sata(struct asd_sas_port *port)
+{
+	struct domain_device *dev;
+
+	mutex_lock(&port->ha->disco_mutex);
+	list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+		struct sata_device *sata;
+
+		if (!dev_is_sata(dev))
+			continue;
+
+		sata = &dev->sata_dev;
+		if (sata->ap->pm_mesg.event == PM_EVENT_ON)
+			continue;
+
+		ata_sas_port_resume(sata->ap);
+	}
+	mutex_unlock(&port->ha->disco_mutex);
+
+	sas_ata_flush_pm_eh(port, __func__);
+}
+
+/**
+ * sas_discover_sata - discover an STP/SATA domain device
+ * @dev: pointer to struct domain_device of interest
+ *
+ * Devices directly attached to a HA port, have no parents.  All other
+ * devices do, and should have their "parent" pointer set appropriately
+ * before calling this function.
+ */
+int sas_discover_sata(struct domain_device *dev)
+{
+	if (dev->dev_type == SAS_SATA_PM)
+		return -ENODEV;
+
+	dev->sata_dev.class = sas_get_ata_command_set(dev);
+	sas_fill_in_rphy(dev, dev->rphy);
+
+	return sas_notify_lldd_dev_found(dev);
+}
+
+static void async_sas_ata_eh(void *data, async_cookie_t cookie)
+{
+	struct domain_device *dev = data;
+	struct ata_port *ap = dev->sata_dev.ap;
+	struct sas_ha_struct *ha = dev->port->ha;
+
+	sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
+	ata_scsi_port_error_handler(ha->core.shost, ap);
+	sas_put_device(dev);
+}
+
+void sas_ata_strategy_handler(struct Scsi_Host *shost)
+{
+	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+	ASYNC_DOMAIN_EXCLUSIVE(async);
+	int i;
+
+	/* it's ok to defer revalidation events during ata eh, these
+	 * disks are in one of three states:
+	 * 1/ present for initial domain discovery, and these
+	 *    resets will cause bcn flutters
+	 * 2/ hot removed, we'll discover that after eh fails
+	 * 3/ hot added after initial discovery, lost the race, and need
+	 *    to catch the next train.
+	 */
+	sas_disable_revalidation(sas_ha);
+
+	spin_lock_irq(&sas_ha->phy_port_lock);
+	for (i = 0; i < sas_ha->num_phys; i++) {
+		struct asd_sas_port *port = sas_ha->sas_port[i];
+		struct domain_device *dev;
+
+		spin_lock(&port->dev_list_lock);
+		list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+			if (!dev_is_sata(dev))
+				continue;
+
+			/* hold a reference over eh since we may be
+			 * racing with final remove once all commands
+			 * are completed
+			 */
+			kref_get(&dev->kref);
+
+			async_schedule_domain(async_sas_ata_eh, dev, &async);
+		}
+		spin_unlock(&port->dev_list_lock);
+	}
+	spin_unlock_irq(&sas_ha->phy_port_lock);
+
+	async_synchronize_full_domain(&async);
+
+	sas_enable_revalidation(sas_ha);
+}
+
+void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
+{
+	struct scsi_cmnd *cmd, *n;
+	struct domain_device *eh_dev;
+
+	do {
+		LIST_HEAD(sata_q);
+		eh_dev = NULL;
+
+		list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
+			struct domain_device *ddev = cmd_to_domain_dev(cmd);
+
+			if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
+				continue;
+			if (eh_dev && eh_dev != ddev)
+				continue;
+			eh_dev = ddev;
+			list_move(&cmd->eh_entry, &sata_q);
+		}
+
+		if (!list_empty(&sata_q)) {
+			struct ata_port *ap = eh_dev->sata_dev.ap;
+
+			sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
+			ata_scsi_cmd_error_handler(shost, ap, &sata_q);
+			/*
+			 * ata's error handler may leave the cmd on the list
+			 * so make sure they don't remain on a stack list
+			 * about to go out of scope.
+			 *
+			 * This looks strange, since the commands are
+			 * now part of no list, but the next error
+			 * action will be ata_port_error_handler()
+			 * which takes no list and sweeps them up
+			 * anyway from the ata tag array.
+			 */
+			while (!list_empty(&sata_q))
+				list_del_init(sata_q.next);
+		}
+	} while (eh_dev);
+}
+
+void sas_ata_schedule_reset(struct domain_device *dev)
+{
+	struct ata_eh_info *ehi;
+	struct ata_port *ap;
+	unsigned long flags;
+
+	if (!dev_is_sata(dev))
+		return;
+
+	ap = dev->sata_dev.ap;
+	ehi = &ap->link.eh_info;
+
+	spin_lock_irqsave(ap->lock, flags);
+	ehi->err_mask |= AC_ERR_TIMEOUT;
+	ehi->action |= ATA_EH_RESET;
+	ata_port_schedule_eh(ap);
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
+
+void sas_ata_wait_eh(struct domain_device *dev)
+{
+	struct ata_port *ap;
+
+	if (!dev_is_sata(dev))
+		return;
+
+	ap = dev->sata_dev.ap;
+	ata_port_wait_eh(ap);
+}
+
+void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
+{
+	struct ata_port *ap = device->sata_dev.ap;
+	struct ata_link *link = &ap->link;
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+	device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
+	device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
+
+	link->eh_info.err_mask |= AC_ERR_DEV;
+	if (force_reset)
+		link->eh_info.action |= ATA_EH_RESET;
+	ata_link_abort(link);
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
+
+int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
+{
+	struct sas_tmf_task tmf_task = {};
+	return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
+			       force_phy_id, &tmf_task);
+}
+EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);