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, 1072 insertions, 0 deletions

diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
new file mode 100644
index 000000000..69a4c9581
--- /dev/null
+++ b/drivers/target/target_core_pscsi.c
@@ -0,0 +1,1072 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*******************************************************************************
+ * Filename:  target_core_pscsi.c
+ *
+ * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
+ *
+ * (c) Copyright 2003-2013 Datera, Inc.
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ ******************************************************************************/
+
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/blk_types.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/cdrom.h>
+#include <linux/ratelimit.h>
+#include <linux/module.h>
+#include <asm/unaligned.h>
+
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_backend.h>
+
+#include "target_core_alua.h"
+#include "target_core_internal.h"
+#include "target_core_pscsi.h"
+
+static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
+{
+	return container_of(dev, struct pscsi_dev_virt, dev);
+}
+
+static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
+static enum rq_end_io_ret pscsi_req_done(struct request *, blk_status_t);
+
+/*	pscsi_attach_hba():
+ *
+ * 	pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
+ *	from the passed SCSI Host ID.
+ */
+static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
+{
+	struct pscsi_hba_virt *phv;
+
+	phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
+	if (!phv) {
+		pr_err("Unable to allocate struct pscsi_hba_virt\n");
+		return -ENOMEM;
+	}
+	phv->phv_host_id = host_id;
+	phv->phv_mode = PHV_VIRTUAL_HOST_ID;
+
+	hba->hba_ptr = phv;
+
+	pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
+		" Generic Target Core Stack %s\n", hba->hba_id,
+		PSCSI_VERSION, TARGET_CORE_VERSION);
+	pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
+	       hba->hba_id);
+
+	return 0;
+}
+
+static void pscsi_detach_hba(struct se_hba *hba)
+{
+	struct pscsi_hba_virt *phv = hba->hba_ptr;
+	struct Scsi_Host *scsi_host = phv->phv_lld_host;
+
+	if (scsi_host) {
+		scsi_host_put(scsi_host);
+
+		pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
+			" Generic Target Core\n", hba->hba_id,
+			(scsi_host->hostt->name) ? (scsi_host->hostt->name) :
+			"Unknown");
+	} else
+		pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
+			" from Generic Target Core\n", hba->hba_id);
+
+	kfree(phv);
+	hba->hba_ptr = NULL;
+}
+
+static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
+{
+	struct pscsi_hba_virt *phv = hba->hba_ptr;
+	struct Scsi_Host *sh = phv->phv_lld_host;
+	/*
+	 * Release the struct Scsi_Host
+	 */
+	if (!mode_flag) {
+		if (!sh)
+			return 0;
+
+		phv->phv_lld_host = NULL;
+		phv->phv_mode = PHV_VIRTUAL_HOST_ID;
+
+		pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
+			" %s\n", hba->hba_id, (sh->hostt->name) ?
+			(sh->hostt->name) : "Unknown");
+
+		scsi_host_put(sh);
+		return 0;
+	}
+	/*
+	 * Otherwise, locate struct Scsi_Host from the original passed
+	 * pSCSI Host ID and enable for phba mode
+	 */
+	sh = scsi_host_lookup(phv->phv_host_id);
+	if (!sh) {
+		pr_err("pSCSI: Unable to locate SCSI Host for"
+			" phv_host_id: %d\n", phv->phv_host_id);
+		return -EINVAL;
+	}
+
+	phv->phv_lld_host = sh;
+	phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
+
+	pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
+		hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
+
+	return 1;
+}
+
+static void pscsi_tape_read_blocksize(struct se_device *dev,
+		struct scsi_device *sdev)
+{
+	unsigned char cdb[MAX_COMMAND_SIZE], *buf;
+	int ret;
+
+	buf = kzalloc(12, GFP_KERNEL);
+	if (!buf)
+		goto out_free;
+
+	memset(cdb, 0, MAX_COMMAND_SIZE);
+	cdb[0] = MODE_SENSE;
+	cdb[4] = 0x0c; /* 12 bytes */
+
+	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
+			HZ, 1, NULL);
+	if (ret)
+		goto out_free;
+
+	/*
+	 * If MODE_SENSE still returns zero, set the default value to 1024.
+	 */
+	sdev->sector_size = get_unaligned_be24(&buf[9]);
+out_free:
+	if (!sdev->sector_size)
+		sdev->sector_size = 1024;
+
+	kfree(buf);
+}
+
+static void
+pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
+{
+	if (sdev->inquiry_len < INQUIRY_LEN)
+		return;
+	/*
+	 * Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun()
+	 */
+	BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1);
+	snprintf(wwn->vendor, sizeof(wwn->vendor),
+		 "%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor);
+	BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1);
+	snprintf(wwn->model, sizeof(wwn->model),
+		 "%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model);
+	BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1);
+	snprintf(wwn->revision, sizeof(wwn->revision),
+		 "%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev);
+}
+
+static int
+pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
+{
+	unsigned char cdb[MAX_COMMAND_SIZE], *buf;
+	int ret;
+
+	buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	memset(cdb, 0, MAX_COMMAND_SIZE);
+	cdb[0] = INQUIRY;
+	cdb[1] = 0x01; /* Query VPD */
+	cdb[2] = 0x80; /* Unit Serial Number */
+	put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]);
+
+	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
+			      INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
+	if (ret)
+		goto out_free;
+
+	snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
+
+	wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
+
+	kfree(buf);
+	return 0;
+
+out_free:
+	kfree(buf);
+	return -EPERM;
+}
+
+static void
+pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
+		struct t10_wwn *wwn)
+{
+	unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
+	int ident_len, page_len, off = 4, ret;
+	struct t10_vpd *vpd;
+
+	buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	memset(cdb, 0, MAX_COMMAND_SIZE);
+	cdb[0] = INQUIRY;
+	cdb[1] = 0x01; /* Query VPD */
+	cdb[2] = 0x83; /* Device Identifier */
+	put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]);
+
+	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
+			      INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
+			      NULL, HZ, 1, NULL);
+	if (ret)
+		goto out;
+
+	page_len = get_unaligned_be16(&buf[2]);
+	while (page_len > 0) {
+		/* Grab a pointer to the Identification descriptor */
+		page_83 = &buf[off];
+		ident_len = page_83[3];
+		if (!ident_len) {
+			pr_err("page_83[3]: identifier"
+					" length zero!\n");
+			break;
+		}
+		pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
+
+		vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
+		if (!vpd) {
+			pr_err("Unable to allocate memory for"
+					" struct t10_vpd\n");
+			goto out;
+		}
+		INIT_LIST_HEAD(&vpd->vpd_list);
+
+		transport_set_vpd_proto_id(vpd, page_83);
+		transport_set_vpd_assoc(vpd, page_83);
+
+		if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
+			off += (ident_len + 4);
+			page_len -= (ident_len + 4);
+			kfree(vpd);
+			continue;
+		}
+		if (transport_set_vpd_ident(vpd, page_83) < 0) {
+			off += (ident_len + 4);
+			page_len -= (ident_len + 4);
+			kfree(vpd);
+			continue;
+		}
+
+		list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
+		off += (ident_len + 4);
+		page_len -= (ident_len + 4);
+	}
+
+out:
+	kfree(buf);
+}
+
+static int pscsi_add_device_to_list(struct se_device *dev,
+		struct scsi_device *sd)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct request_queue *q = sd->request_queue;
+
+	pdv->pdv_sd = sd;
+
+	if (!sd->queue_depth) {
+		sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
+
+		pr_err("Set broken SCSI Device %d:%d:%llu"
+			" queue_depth to %d\n", sd->channel, sd->id,
+				sd->lun, sd->queue_depth);
+	}
+
+	dev->dev_attrib.hw_block_size =
+		min_not_zero((int)sd->sector_size, 512);
+	dev->dev_attrib.hw_max_sectors =
+		min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q));
+	dev->dev_attrib.hw_queue_depth = sd->queue_depth;
+
+	/*
+	 * Setup our standard INQUIRY info into se_dev->t10_wwn
+	 */
+	pscsi_set_inquiry_info(sd, &dev->t10_wwn);
+
+	/*
+	 * Locate VPD WWN Information used for various purposes within
+	 * the Storage Engine.
+	 */
+	if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
+		/*
+		 * If VPD Unit Serial returned GOOD status, try
+		 * VPD Device Identification page (0x83).
+		 */
+		pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
+	}
+
+	/*
+	 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
+	 */
+	if (sd->type == TYPE_TAPE) {
+		pscsi_tape_read_blocksize(dev, sd);
+		dev->dev_attrib.hw_block_size = sd->sector_size;
+	}
+	return 0;
+}
+
+static struct se_device *pscsi_alloc_device(struct se_hba *hba,
+		const char *name)
+{
+	struct pscsi_dev_virt *pdv;
+
+	pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
+	if (!pdv) {
+		pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
+		return NULL;
+	}
+
+	pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
+	return &pdv->dev;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
+	__releases(sh->host_lock)
+{
+	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct Scsi_Host *sh = sd->host;
+	struct block_device *bd;
+	int ret;
+
+	if (scsi_device_get(sd)) {
+		pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
+			sh->host_no, sd->channel, sd->id, sd->lun);
+		spin_unlock_irq(sh->host_lock);
+		return -EIO;
+	}
+	spin_unlock_irq(sh->host_lock);
+	/*
+	 * Claim exclusive struct block_device access to struct scsi_device
+	 * for TYPE_DISK and TYPE_ZBC using supplied udev_path
+	 */
+	bd = blkdev_get_by_path(dev->udev_path,
+				FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
+	if (IS_ERR(bd)) {
+		pr_err("pSCSI: blkdev_get_by_path() failed\n");
+		scsi_device_put(sd);
+		return PTR_ERR(bd);
+	}
+	pdv->pdv_bd = bd;
+
+	ret = pscsi_add_device_to_list(dev, sd);
+	if (ret) {
+		blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+		scsi_device_put(sd);
+		return ret;
+	}
+
+	pr_debug("CORE_PSCSI[%d] - Added TYPE_%s for %d:%d:%d:%llu\n",
+		phv->phv_host_id, sd->type == TYPE_DISK ? "DISK" : "ZBC",
+		sh->host_no, sd->channel, sd->id, sd->lun);
+	return 0;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd)
+	__releases(sh->host_lock)
+{
+	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
+	struct Scsi_Host *sh = sd->host;
+	int ret;
+
+	if (scsi_device_get(sd)) {
+		pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
+			sh->host_no, sd->channel, sd->id, sd->lun);
+		spin_unlock_irq(sh->host_lock);
+		return -EIO;
+	}
+	spin_unlock_irq(sh->host_lock);
+
+	ret = pscsi_add_device_to_list(dev, sd);
+	if (ret) {
+		scsi_device_put(sd);
+		return ret;
+	}
+	pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
+		phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
+		sd->channel, sd->id, sd->lun);
+
+	return 0;
+}
+
+static int pscsi_configure_device(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct scsi_device *sd;
+	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
+	struct Scsi_Host *sh = phv->phv_lld_host;
+	int legacy_mode_enable = 0;
+	int ret;
+
+	if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
+	    !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
+	    !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
+		pr_err("Missing scsi_channel_id=, scsi_target_id= and"
+			" scsi_lun_id= parameters\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
+	 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
+	 */
+	if (!sh) {
+		if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
+			pr_err("pSCSI: Unable to locate struct"
+				" Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
+			return -ENODEV;
+		}
+		/*
+		 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
+		 * reference, we enforce that udev_path has been set
+		 */
+		if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
+			pr_err("pSCSI: udev_path attribute has not"
+				" been set before ENABLE=1\n");
+			return -EINVAL;
+		}
+		/*
+		 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
+		 * use the original TCM hba ID to reference Linux/SCSI Host No
+		 * and enable for PHV_LLD_SCSI_HOST_NO mode.
+		 */
+		if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
+			if (hba->dev_count) {
+				pr_err("pSCSI: Unable to set hba_mode"
+					" with active devices\n");
+				return -EEXIST;
+			}
+
+			if (pscsi_pmode_enable_hba(hba, 1) != 1)
+				return -ENODEV;
+
+			legacy_mode_enable = 1;
+			hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
+			sh = phv->phv_lld_host;
+		} else {
+			sh = scsi_host_lookup(pdv->pdv_host_id);
+			if (!sh) {
+				pr_err("pSCSI: Unable to locate"
+					" pdv_host_id: %d\n", pdv->pdv_host_id);
+				return -EINVAL;
+			}
+			pdv->pdv_lld_host = sh;
+		}
+	} else {
+		if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
+			pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
+				" struct Scsi_Host exists\n");
+			return -EEXIST;
+		}
+	}
+
+	spin_lock_irq(sh->host_lock);
+	list_for_each_entry(sd, &sh->__devices, siblings) {
+		if ((pdv->pdv_channel_id != sd->channel) ||
+		    (pdv->pdv_target_id != sd->id) ||
+		    (pdv->pdv_lun_id != sd->lun))
+			continue;
+		/*
+		 * Functions will release the held struct scsi_host->host_lock
+		 * before calling pscsi_add_device_to_list() to register
+		 * struct scsi_device with target_core_mod.
+		 */
+		switch (sd->type) {
+		case TYPE_DISK:
+		case TYPE_ZBC:
+			ret = pscsi_create_type_disk(dev, sd);
+			break;
+		default:
+			ret = pscsi_create_type_nondisk(dev, sd);
+			break;
+		}
+
+		if (ret) {
+			if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
+				scsi_host_put(sh);
+			else if (legacy_mode_enable) {
+				pscsi_pmode_enable_hba(hba, 0);
+				hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
+			}
+			pdv->pdv_sd = NULL;
+			return ret;
+		}
+		return 0;
+	}
+	spin_unlock_irq(sh->host_lock);
+
+	pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
+		pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
+
+	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
+		scsi_host_put(sh);
+	else if (legacy_mode_enable) {
+		pscsi_pmode_enable_hba(hba, 0);
+		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
+	}
+
+	return -ENODEV;
+}
+
+static void pscsi_dev_call_rcu(struct rcu_head *p)
+{
+	struct se_device *dev = container_of(p, struct se_device, rcu_head);
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+
+	kfree(pdv);
+}
+
+static void pscsi_free_device(struct se_device *dev)
+{
+	call_rcu(&dev->rcu_head, pscsi_dev_call_rcu);
+}
+
+static void pscsi_destroy_device(struct se_device *dev)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
+	struct scsi_device *sd = pdv->pdv_sd;
+
+	if (sd) {
+		/*
+		 * Release exclusive pSCSI internal struct block_device claim for
+		 * struct scsi_device with TYPE_DISK or TYPE_ZBC
+		 * from pscsi_create_type_disk()
+		 */
+		if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) &&
+		    pdv->pdv_bd) {
+			blkdev_put(pdv->pdv_bd,
+				   FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+			pdv->pdv_bd = NULL;
+		}
+		/*
+		 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
+		 * to struct Scsi_Host now.
+		 */
+		if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
+		    (phv->phv_lld_host != NULL))
+			scsi_host_put(phv->phv_lld_host);
+		else if (pdv->pdv_lld_host)
+			scsi_host_put(pdv->pdv_lld_host);
+
+		scsi_device_put(sd);
+
+		pdv->pdv_sd = NULL;
+	}
+}
+
+static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
+			       unsigned char *req_sense, int valid_data)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
+	struct scsi_device *sd = pdv->pdv_sd;
+	unsigned char *cdb = cmd->priv;
+
+	/*
+	 * Special case for REPORT_LUNs which is emulated and not passed on.
+	 */
+	if (!cdb)
+		return;
+
+	/*
+	 * Hack to make sure that Write-Protect modepage is set if R/O mode is
+	 * forced.
+	 */
+	if (!cmd->data_length)
+		goto after_mode_sense;
+
+	if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
+	    scsi_status == SAM_STAT_GOOD) {
+		bool read_only = target_lun_is_rdonly(cmd);
+
+		if (read_only) {
+			unsigned char *buf;
+
+			buf = transport_kmap_data_sg(cmd);
+			if (!buf) {
+				; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
+			} else {
+				if (cdb[0] == MODE_SENSE_10) {
+					if (!(buf[3] & 0x80))
+						buf[3] |= 0x80;
+				} else {
+					if (!(buf[2] & 0x80))
+						buf[2] |= 0x80;
+				}
+
+				transport_kunmap_data_sg(cmd);
+			}
+		}
+	}
+after_mode_sense:
+
+	if (sd->type != TYPE_TAPE || !cmd->data_length)
+		goto after_mode_select;
+
+	/*
+	 * Hack to correctly obtain the initiator requested blocksize for
+	 * TYPE_TAPE.  Since this value is dependent upon each tape media,
+	 * struct scsi_device->sector_size will not contain the correct value
+	 * by default, so we go ahead and set it so
+	 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
+	 * storage engine.
+	 */
+	if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
+	     scsi_status == SAM_STAT_GOOD) {
+		unsigned char *buf;
+		u16 bdl;
+		u32 blocksize;
+
+		buf = sg_virt(&cmd->t_data_sg[0]);
+		if (!buf) {
+			pr_err("Unable to get buf for scatterlist\n");
+			goto after_mode_select;
+		}
+
+		if (cdb[0] == MODE_SELECT)
+			bdl = buf[3];
+		else
+			bdl = get_unaligned_be16(&buf[6]);
+
+		if (!bdl)
+			goto after_mode_select;
+
+		if (cdb[0] == MODE_SELECT)
+			blocksize = get_unaligned_be24(&buf[9]);
+		else
+			blocksize = get_unaligned_be24(&buf[13]);
+
+		sd->sector_size = blocksize;
+	}
+after_mode_select:
+
+	if (scsi_status == SAM_STAT_CHECK_CONDITION) {
+		transport_copy_sense_to_cmd(cmd, req_sense);
+
+		/*
+		 * check for TAPE device reads with
+		 * FM/EOM/ILI set, so that we can get data
+		 * back despite framework assumption that a
+		 * check condition means there is no data
+		 */
+		if (sd->type == TYPE_TAPE && valid_data &&
+		    cmd->data_direction == DMA_FROM_DEVICE) {
+			/*
+			 * is sense data valid, fixed format,
+			 * and have FM, EOM, or ILI set?
+			 */
+			if (req_sense[0] == 0xf0 &&	/* valid, fixed format */
+			    req_sense[2] & 0xe0 &&	/* FM, EOM, or ILI */
+			    (req_sense[2] & 0xf) == 0) { /* key==NO_SENSE */
+				pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n");
+				cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL;
+			}
+		}
+	}
+}
+
+enum {
+	Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
+	Opt_scsi_lun_id, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_scsi_host_id, "scsi_host_id=%d"},
+	{Opt_scsi_channel_id, "scsi_channel_id=%d"},
+	{Opt_scsi_target_id, "scsi_target_id=%d"},
+	{Opt_scsi_lun_id, "scsi_lun_id=%d"},
+	{Opt_err, NULL}
+};
+
+static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
+		const char *page, ssize_t count)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
+	char *orig, *ptr, *opts;
+	substring_t args[MAX_OPT_ARGS];
+	int ret = 0, arg, token;
+
+	opts = kstrdup(page, GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	orig = opts;
+
+	while ((ptr = strsep(&opts, ",\n")) != NULL) {
+		if (!*ptr)
+			continue;
+
+		token = match_token(ptr, tokens, args);
+		switch (token) {
+		case Opt_scsi_host_id:
+			if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
+				pr_err("PSCSI[%d]: Unable to accept"
+					" scsi_host_id while phv_mode =="
+					" PHV_LLD_SCSI_HOST_NO\n",
+					phv->phv_host_id);
+				ret = -EINVAL;
+				goto out;
+			}
+			ret = match_int(args, &arg);
+			if (ret)
+				goto out;
+			pdv->pdv_host_id = arg;
+			pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
+				" %d\n", phv->phv_host_id, pdv->pdv_host_id);
+			pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
+			break;
+		case Opt_scsi_channel_id:
+			ret = match_int(args, &arg);
+			if (ret)
+				goto out;
+			pdv->pdv_channel_id = arg;
+			pr_debug("PSCSI[%d]: Referencing SCSI Channel"
+				" ID: %d\n",  phv->phv_host_id,
+				pdv->pdv_channel_id);
+			pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
+			break;
+		case Opt_scsi_target_id:
+			ret = match_int(args, &arg);
+			if (ret)
+				goto out;
+			pdv->pdv_target_id = arg;
+			pr_debug("PSCSI[%d]: Referencing SCSI Target"
+				" ID: %d\n", phv->phv_host_id,
+				pdv->pdv_target_id);
+			pdv->pdv_flags |= PDF_HAS_TARGET_ID;
+			break;
+		case Opt_scsi_lun_id:
+			ret = match_int(args, &arg);
+			if (ret)
+				goto out;
+			pdv->pdv_lun_id = arg;
+			pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
+				" %d\n", phv->phv_host_id, pdv->pdv_lun_id);
+			pdv->pdv_flags |= PDF_HAS_LUN_ID;
+			break;
+		default:
+			break;
+		}
+	}
+
+out:
+	kfree(orig);
+	return (!ret) ? count : ret;
+}
+
+static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
+{
+	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct scsi_device *sd = pdv->pdv_sd;
+	unsigned char host_id[16];
+	ssize_t bl;
+
+	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
+		snprintf(host_id, 16, "%d", pdv->pdv_host_id);
+	else
+		snprintf(host_id, 16, "PHBA Mode");
+
+	bl = sprintf(b, "SCSI Device Bus Location:"
+		" Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
+		pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
+		host_id);
+
+	if (sd) {
+		bl += sprintf(b + bl, "        Vendor: %."
+			__stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor);
+		bl += sprintf(b + bl, " Model: %."
+			__stringify(INQUIRY_MODEL_LEN) "s", sd->model);
+		bl += sprintf(b + bl, " Rev: %."
+			__stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev);
+	}
+	return bl;
+}
+
+static void pscsi_bi_endio(struct bio *bio)
+{
+	bio_uninit(bio);
+	kfree(bio);
+}
+
+static sense_reason_t
+pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
+		struct request *req)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
+	struct bio *bio = NULL;
+	struct page *page;
+	struct scatterlist *sg;
+	u32 data_len = cmd->data_length, i, len, bytes, off;
+	int nr_pages = (cmd->data_length + sgl[0].offset +
+			PAGE_SIZE - 1) >> PAGE_SHIFT;
+	int nr_vecs = 0, rc;
+	int rw = (cmd->data_direction == DMA_TO_DEVICE);
+
+	BUG_ON(!cmd->data_length);
+
+	pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
+
+	for_each_sg(sgl, sg, sgl_nents, i) {
+		page = sg_page(sg);
+		off = sg->offset;
+		len = sg->length;
+
+		pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
+			page, len, off);
+
+		/*
+		 * We only have one page of data in each sg element,
+		 * we can not cross a page boundary.
+		 */
+		if (off + len > PAGE_SIZE)
+			goto fail;
+
+		if (len > 0 && data_len > 0) {
+			bytes = min_t(unsigned int, len, PAGE_SIZE - off);
+			bytes = min(bytes, data_len);
+
+			if (!bio) {
+new_bio:
+				nr_vecs = bio_max_segs(nr_pages);
+				bio = bio_kmalloc(nr_vecs, GFP_KERNEL);
+				if (!bio)
+					goto fail;
+				bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs,
+					 rw ? REQ_OP_WRITE : REQ_OP_READ);
+				bio->bi_end_io = pscsi_bi_endio;
+
+				pr_debug("PSCSI: Allocated bio: %p,"
+					" dir: %s nr_vecs: %d\n", bio,
+					(rw) ? "rw" : "r", nr_vecs);
+			}
+
+			pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
+				" bio: %p page: %p len: %d off: %d\n", i, bio,
+				page, len, off);
+
+			rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
+					bio, page, bytes, off);
+			pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
+				bio_segments(bio), nr_vecs);
+			if (rc != bytes) {
+				pr_debug("PSCSI: Reached bio->bi_vcnt max:"
+					" %d i: %d bio: %p, allocating another"
+					" bio\n", bio->bi_vcnt, i, bio);
+
+				rc = blk_rq_append_bio(req, bio);
+				if (rc) {
+					pr_err("pSCSI: failed to append bio\n");
+					goto fail;
+				}
+
+				goto new_bio;
+			}
+
+			data_len -= bytes;
+		}
+	}
+
+	if (bio) {
+		rc = blk_rq_append_bio(req, bio);
+		if (rc) {
+			pr_err("pSCSI: failed to append bio\n");
+			goto fail;
+		}
+	}
+
+	return 0;
+fail:
+	if (bio)
+		bio_put(bio);
+	while (req->bio) {
+		bio = req->bio;
+		req->bio = bio->bi_next;
+		bio_put(bio);
+	}
+	req->biotail = NULL;
+	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+}
+
+static sense_reason_t
+pscsi_parse_cdb(struct se_cmd *cmd)
+{
+	if (cmd->se_cmd_flags & SCF_BIDI)
+		return TCM_UNSUPPORTED_SCSI_OPCODE;
+
+	return passthrough_parse_cdb(cmd, pscsi_execute_cmd);
+}
+
+static sense_reason_t
+pscsi_execute_cmd(struct se_cmd *cmd)
+{
+	struct scatterlist *sgl = cmd->t_data_sg;
+	u32 sgl_nents = cmd->t_data_nents;
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
+	struct scsi_cmnd *scmd;
+	struct request *req;
+	sense_reason_t ret;
+
+	req = scsi_alloc_request(pdv->pdv_sd->request_queue,
+			cmd->data_direction == DMA_TO_DEVICE ?
+			REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
+	if (IS_ERR(req))
+		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+	if (sgl) {
+		ret = pscsi_map_sg(cmd, sgl, sgl_nents, req);
+		if (ret)
+			goto fail_put_request;
+	}
+
+	req->end_io = pscsi_req_done;
+	req->end_io_data = cmd;
+
+	scmd = blk_mq_rq_to_pdu(req);
+	scmd->cmd_len = scsi_command_size(cmd->t_task_cdb);
+	if (scmd->cmd_len > sizeof(scmd->cmnd)) {
+		ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+		goto fail_put_request;
+	}
+	memcpy(scmd->cmnd, cmd->t_task_cdb, scmd->cmd_len);
+
+	if (pdv->pdv_sd->type == TYPE_DISK ||
+	    pdv->pdv_sd->type == TYPE_ZBC)
+		req->timeout = PS_TIMEOUT_DISK;
+	else
+		req->timeout = PS_TIMEOUT_OTHER;
+	scmd->allowed = PS_RETRY;
+
+	cmd->priv = scmd->cmnd;
+
+	blk_execute_rq_nowait(req, cmd->sam_task_attr == TCM_HEAD_TAG);
+
+	return 0;
+
+fail_put_request:
+	blk_mq_free_request(req);
+	return ret;
+}
+
+/*	pscsi_get_device_type():
+ *
+ *
+ */
+static u32 pscsi_get_device_type(struct se_device *dev)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+	struct scsi_device *sd = pdv->pdv_sd;
+
+	return (sd) ? sd->type : TYPE_NO_LUN;
+}
+
+static sector_t pscsi_get_blocks(struct se_device *dev)
+{
+	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
+
+	if (pdv->pdv_bd)
+		return bdev_nr_sectors(pdv->pdv_bd);
+	return 0;
+}
+
+static enum rq_end_io_ret pscsi_req_done(struct request *req,
+					 blk_status_t status)
+{
+	struct se_cmd *cmd = req->end_io_data;
+	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
+	enum sam_status scsi_status = scmd->result & 0xff;
+	int valid_data = cmd->data_length - scmd->resid_len;
+	u8 *cdb = cmd->priv;
+
+	if (scsi_status != SAM_STAT_GOOD) {
+		pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
+			" 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result);
+	}
+
+	pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer, valid_data);
+
+	switch (host_byte(scmd->result)) {
+	case DID_OK:
+		target_complete_cmd_with_length(cmd, scsi_status, valid_data);
+		break;
+	default:
+		pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
+			" 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result);
+		target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
+		break;
+	}
+
+	blk_mq_free_request(req);
+	return RQ_END_IO_NONE;
+}
+
+static const struct target_backend_ops pscsi_ops = {
+	.name			= "pscsi",
+	.owner			= THIS_MODULE,
+	.transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH |
+				   TRANSPORT_FLAG_PASSTHROUGH_ALUA |
+				   TRANSPORT_FLAG_PASSTHROUGH_PGR,
+	.attach_hba		= pscsi_attach_hba,
+	.detach_hba		= pscsi_detach_hba,
+	.pmode_enable_hba	= pscsi_pmode_enable_hba,
+	.alloc_device		= pscsi_alloc_device,
+	.configure_device	= pscsi_configure_device,
+	.destroy_device		= pscsi_destroy_device,
+	.free_device		= pscsi_free_device,
+	.parse_cdb		= pscsi_parse_cdb,
+	.set_configfs_dev_params = pscsi_set_configfs_dev_params,
+	.show_configfs_dev_params = pscsi_show_configfs_dev_params,
+	.get_device_type	= pscsi_get_device_type,
+	.get_blocks		= pscsi_get_blocks,
+	.tb_dev_attrib_attrs	= passthrough_attrib_attrs,
+};
+
+static int __init pscsi_module_init(void)
+{
+	return transport_backend_register(&pscsi_ops);
+}
+
+static void __exit pscsi_module_exit(void)
+{
+	target_backend_unregister(&pscsi_ops);
+}
+
+MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(pscsi_module_init);
+module_exit(pscsi_module_exit);