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, 1202 insertions, 0 deletions

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
new file mode 100644
index 000000000..f6e58410e
--- /dev/null
+++ b/drivers/target/target_core_device.c
@@ -0,0 +1,1202 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*******************************************************************************
+ * Filename:  target_core_device.c (based on iscsi_target_device.c)
+ *
+ * This file contains the TCM Virtual Device and Disk Transport
+ * agnostic related functions.
+ *
+ * (c) Copyright 2003-2013 Datera, Inc.
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
+#include <linux/in.h>
+#include <linux/export.h>
+#include <linux/t10-pi.h>
+#include <asm/unaligned.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi_common.h>
+#include <scsi/scsi_proto.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_backend.h>
+#include <target/target_core_fabric.h>
+
+#include "target_core_internal.h"
+#include "target_core_alua.h"
+#include "target_core_pr.h"
+#include "target_core_ua.h"
+
+static DEFINE_MUTEX(device_mutex);
+static LIST_HEAD(device_list);
+static DEFINE_IDR(devices_idr);
+
+static struct se_hba *lun0_hba;
+/* not static, needed by tpg.c */
+struct se_device *g_lun0_dev;
+
+sense_reason_t
+transport_lookup_cmd_lun(struct se_cmd *se_cmd)
+{
+	struct se_lun *se_lun = NULL;
+	struct se_session *se_sess = se_cmd->se_sess;
+	struct se_node_acl *nacl = se_sess->se_node_acl;
+	struct se_dev_entry *deve;
+	sense_reason_t ret = TCM_NO_SENSE;
+
+	rcu_read_lock();
+	deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
+	if (deve) {
+		atomic_long_inc(&deve->total_cmds);
+
+		if (se_cmd->data_direction == DMA_TO_DEVICE)
+			atomic_long_add(se_cmd->data_length,
+					&deve->write_bytes);
+		else if (se_cmd->data_direction == DMA_FROM_DEVICE)
+			atomic_long_add(se_cmd->data_length,
+					&deve->read_bytes);
+
+		if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
+		    deve->lun_access_ro) {
+			pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
+				" Access for 0x%08llx\n",
+				se_cmd->se_tfo->fabric_name,
+				se_cmd->orig_fe_lun);
+			rcu_read_unlock();
+			return TCM_WRITE_PROTECTED;
+		}
+
+		se_lun = deve->se_lun;
+
+		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
+			se_lun = NULL;
+			goto out_unlock;
+		}
+
+		se_cmd->se_lun = se_lun;
+		se_cmd->pr_res_key = deve->pr_res_key;
+		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+		se_cmd->lun_ref_active = true;
+	}
+out_unlock:
+	rcu_read_unlock();
+
+	if (!se_lun) {
+		/*
+		 * Use the se_portal_group->tpg_virt_lun0 to allow for
+		 * REPORT_LUNS, et al to be returned when no active
+		 * MappedLUN=0 exists for this Initiator Port.
+		 */
+		if (se_cmd->orig_fe_lun != 0) {
+			pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
+				" Access for 0x%08llx from %s\n",
+				se_cmd->se_tfo->fabric_name,
+				se_cmd->orig_fe_lun,
+				nacl->initiatorname);
+			return TCM_NON_EXISTENT_LUN;
+		}
+
+		/*
+		 * Force WRITE PROTECT for virtual LUN 0
+		 */
+		if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
+		    (se_cmd->data_direction != DMA_NONE))
+			return TCM_WRITE_PROTECTED;
+
+		se_lun = se_sess->se_tpg->tpg_virt_lun0;
+		if (!percpu_ref_tryget_live(&se_lun->lun_ref))
+			return TCM_NON_EXISTENT_LUN;
+
+		se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
+		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+		se_cmd->lun_ref_active = true;
+	}
+	/*
+	 * RCU reference protected by percpu se_lun->lun_ref taken above that
+	 * must drop to zero (including initial reference) before this se_lun
+	 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
+	 * target_core_fabric_configfs.c:target_fabric_port_release
+	 */
+	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
+	atomic_long_inc(&se_cmd->se_dev->num_cmds);
+
+	if (se_cmd->data_direction == DMA_TO_DEVICE)
+		atomic_long_add(se_cmd->data_length,
+				&se_cmd->se_dev->write_bytes);
+	else if (se_cmd->data_direction == DMA_FROM_DEVICE)
+		atomic_long_add(se_cmd->data_length,
+				&se_cmd->se_dev->read_bytes);
+
+	return ret;
+}
+EXPORT_SYMBOL(transport_lookup_cmd_lun);
+
+int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *se_lun = NULL;
+	struct se_session *se_sess = se_cmd->se_sess;
+	struct se_node_acl *nacl = se_sess->se_node_acl;
+	struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
+	unsigned long flags;
+
+	rcu_read_lock();
+	deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
+	if (deve) {
+		se_lun = deve->se_lun;
+
+		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
+			se_lun = NULL;
+			goto out_unlock;
+		}
+
+		se_cmd->se_lun = se_lun;
+		se_cmd->pr_res_key = deve->pr_res_key;
+		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+		se_cmd->lun_ref_active = true;
+	}
+out_unlock:
+	rcu_read_unlock();
+
+	if (!se_lun) {
+		pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
+			" Access for 0x%08llx for %s\n",
+			se_cmd->se_tfo->fabric_name,
+			se_cmd->orig_fe_lun,
+			nacl->initiatorname);
+		return -ENODEV;
+	}
+	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
+	se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
+
+	spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
+	list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
+	spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(transport_lookup_tmr_lun);
+
+bool target_lun_is_rdonly(struct se_cmd *cmd)
+{
+	struct se_session *se_sess = cmd->se_sess;
+	struct se_dev_entry *deve;
+	bool ret;
+
+	rcu_read_lock();
+	deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
+	ret = deve && deve->lun_access_ro;
+	rcu_read_unlock();
+
+	return ret;
+}
+EXPORT_SYMBOL(target_lun_is_rdonly);
+
+/*
+ * This function is called from core_scsi3_emulate_pro_register_and_move()
+ * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
+ * when a matching rtpi is found.
+ */
+struct se_dev_entry *core_get_se_deve_from_rtpi(
+	struct se_node_acl *nacl,
+	u16 rtpi)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *lun;
+	struct se_portal_group *tpg = nacl->se_tpg;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
+		lun = deve->se_lun;
+		if (!lun) {
+			pr_err("%s device entries device pointer is"
+				" NULL, but Initiator has access.\n",
+				tpg->se_tpg_tfo->fabric_name);
+			continue;
+		}
+		if (lun->lun_rtpi != rtpi)
+			continue;
+
+		kref_get(&deve->pr_kref);
+		rcu_read_unlock();
+
+		return deve;
+	}
+	rcu_read_unlock();
+
+	return NULL;
+}
+
+void core_free_device_list_for_node(
+	struct se_node_acl *nacl,
+	struct se_portal_group *tpg)
+{
+	struct se_dev_entry *deve;
+
+	mutex_lock(&nacl->lun_entry_mutex);
+	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
+		core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg);
+	mutex_unlock(&nacl->lun_entry_mutex);
+}
+
+void core_update_device_list_access(
+	u64 mapped_lun,
+	bool lun_access_ro,
+	struct se_node_acl *nacl)
+{
+	struct se_dev_entry *deve;
+
+	mutex_lock(&nacl->lun_entry_mutex);
+	deve = target_nacl_find_deve(nacl, mapped_lun);
+	if (deve)
+		deve->lun_access_ro = lun_access_ro;
+	mutex_unlock(&nacl->lun_entry_mutex);
+}
+
+/*
+ * Called with rcu_read_lock or nacl->device_list_lock held.
+ */
+struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
+{
+	struct se_dev_entry *deve;
+
+	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
+		if (deve->mapped_lun == mapped_lun)
+			return deve;
+
+	return NULL;
+}
+EXPORT_SYMBOL(target_nacl_find_deve);
+
+void target_pr_kref_release(struct kref *kref)
+{
+	struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
+						 pr_kref);
+	complete(&deve->pr_comp);
+}
+
+/*
+ * Establish UA condition on SCSI device - all LUNs
+ */
+void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
+{
+	struct se_dev_entry *se_deve;
+	struct se_lun *lun;
+
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
+
+		spin_lock(&lun->lun_deve_lock);
+		list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
+			core_scsi3_ua_allocate(se_deve, asc, ascq);
+		spin_unlock(&lun->lun_deve_lock);
+	}
+	spin_unlock(&dev->se_port_lock);
+}
+
+static void
+target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
+			     bool skip_new)
+{
+	struct se_dev_entry *tmp;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
+		if (skip_new && tmp == new)
+			continue;
+		core_scsi3_ua_allocate(tmp, 0x3F,
+				       ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
+	}
+	rcu_read_unlock();
+}
+
+int core_enable_device_list_for_node(
+	struct se_lun *lun,
+	struct se_lun_acl *lun_acl,
+	u64 mapped_lun,
+	bool lun_access_ro,
+	struct se_node_acl *nacl,
+	struct se_portal_group *tpg)
+{
+	struct se_dev_entry *orig, *new;
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (!new) {
+		pr_err("Unable to allocate se_dev_entry memory\n");
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&new->ua_lock);
+	INIT_LIST_HEAD(&new->ua_list);
+	INIT_LIST_HEAD(&new->lun_link);
+
+	new->mapped_lun = mapped_lun;
+	kref_init(&new->pr_kref);
+	init_completion(&new->pr_comp);
+
+	new->lun_access_ro = lun_access_ro;
+	new->creation_time = get_jiffies_64();
+	new->attach_count++;
+
+	mutex_lock(&nacl->lun_entry_mutex);
+	orig = target_nacl_find_deve(nacl, mapped_lun);
+	if (orig && orig->se_lun) {
+		struct se_lun *orig_lun = orig->se_lun;
+
+		if (orig_lun != lun) {
+			pr_err("Existing orig->se_lun doesn't match new lun"
+			       " for dynamic -> explicit NodeACL conversion:"
+				" %s\n", nacl->initiatorname);
+			mutex_unlock(&nacl->lun_entry_mutex);
+			kfree(new);
+			return -EINVAL;
+		}
+		if (orig->se_lun_acl != NULL) {
+			pr_warn_ratelimited("Detected existing explicit"
+				" se_lun_acl->se_lun_group reference for %s"
+				" mapped_lun: %llu, failing\n",
+				 nacl->initiatorname, mapped_lun);
+			mutex_unlock(&nacl->lun_entry_mutex);
+			kfree(new);
+			return -EINVAL;
+		}
+
+		new->se_lun = lun;
+		new->se_lun_acl = lun_acl;
+		hlist_del_rcu(&orig->link);
+		hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
+		mutex_unlock(&nacl->lun_entry_mutex);
+
+		spin_lock(&lun->lun_deve_lock);
+		list_del(&orig->lun_link);
+		list_add_tail(&new->lun_link, &lun->lun_deve_list);
+		spin_unlock(&lun->lun_deve_lock);
+
+		kref_put(&orig->pr_kref, target_pr_kref_release);
+		wait_for_completion(&orig->pr_comp);
+
+		target_luns_data_has_changed(nacl, new, true);
+		kfree_rcu(orig, rcu_head);
+		return 0;
+	}
+
+	new->se_lun = lun;
+	new->se_lun_acl = lun_acl;
+	hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
+	mutex_unlock(&nacl->lun_entry_mutex);
+
+	spin_lock(&lun->lun_deve_lock);
+	list_add_tail(&new->lun_link, &lun->lun_deve_list);
+	spin_unlock(&lun->lun_deve_lock);
+
+	target_luns_data_has_changed(nacl, new, true);
+	return 0;
+}
+
+void core_disable_device_list_for_node(
+	struct se_lun *lun,
+	struct se_dev_entry *orig,
+	struct se_node_acl *nacl,
+	struct se_portal_group *tpg)
+{
+	/*
+	 * rcu_dereference_raw protected by se_lun->lun_group symlink
+	 * reference to se_device->dev_group.
+	 */
+	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
+
+	lockdep_assert_held(&nacl->lun_entry_mutex);
+
+	/*
+	 * If the MappedLUN entry is being disabled, the entry in
+	 * lun->lun_deve_list must be removed now before clearing the
+	 * struct se_dev_entry pointers below as logic in
+	 * core_alua_do_transition_tg_pt() depends on these being present.
+	 *
+	 * deve->se_lun_acl will be NULL for demo-mode created LUNs
+	 * that have not been explicitly converted to MappedLUNs ->
+	 * struct se_lun_acl, but we remove deve->lun_link from
+	 * lun->lun_deve_list. This also means that active UAs and
+	 * NodeACL context specific PR metadata for demo-mode
+	 * MappedLUN *deve will be released below..
+	 */
+	spin_lock(&lun->lun_deve_lock);
+	list_del(&orig->lun_link);
+	spin_unlock(&lun->lun_deve_lock);
+	/*
+	 * Disable struct se_dev_entry LUN ACL mapping
+	 */
+	core_scsi3_ua_release_all(orig);
+
+	hlist_del_rcu(&orig->link);
+	clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
+	orig->lun_access_ro = false;
+	orig->creation_time = 0;
+	orig->attach_count--;
+	/*
+	 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
+	 * or REGISTER_AND_MOVE PR operation to complete.
+	 */
+	kref_put(&orig->pr_kref, target_pr_kref_release);
+	wait_for_completion(&orig->pr_comp);
+
+	kfree_rcu(orig, rcu_head);
+
+	core_scsi3_free_pr_reg_from_nacl(dev, nacl);
+	target_luns_data_has_changed(nacl, NULL, false);
+}
+
+/*      core_clear_lun_from_tpg():
+ *
+ *
+ */
+void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
+{
+	struct se_node_acl *nacl;
+	struct se_dev_entry *deve;
+
+	mutex_lock(&tpg->acl_node_mutex);
+	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
+
+		mutex_lock(&nacl->lun_entry_mutex);
+		hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
+			if (lun != deve->se_lun)
+				continue;
+
+			core_disable_device_list_for_node(lun, deve, nacl, tpg);
+		}
+		mutex_unlock(&nacl->lun_entry_mutex);
+	}
+	mutex_unlock(&tpg->acl_node_mutex);
+}
+
+int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
+{
+	struct se_lun *tmp;
+
+	spin_lock(&dev->se_port_lock);
+	if (dev->export_count == 0x0000ffff) {
+		pr_warn("Reached dev->dev_port_count =="
+				" 0x0000ffff\n");
+		spin_unlock(&dev->se_port_lock);
+		return -ENOSPC;
+	}
+again:
+	/*
+	 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
+	 * Here is the table from spc4r17 section 7.7.3.8.
+	 *
+	 *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
+	 *
+	 * Code      Description
+	 * 0h        Reserved
+	 * 1h        Relative port 1, historically known as port A
+	 * 2h        Relative port 2, historically known as port B
+	 * 3h to FFFFh    Relative port 3 through 65 535
+	 */
+	lun->lun_rtpi = dev->dev_rpti_counter++;
+	if (!lun->lun_rtpi)
+		goto again;
+
+	list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
+		/*
+		 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
+		 * for 16-bit wrap..
+		 */
+		if (lun->lun_rtpi == tmp->lun_rtpi)
+			goto again;
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return 0;
+}
+
+static void se_release_vpd_for_dev(struct se_device *dev)
+{
+	struct t10_vpd *vpd, *vpd_tmp;
+
+	spin_lock(&dev->t10_wwn.t10_vpd_lock);
+	list_for_each_entry_safe(vpd, vpd_tmp,
+			&dev->t10_wwn.t10_vpd_list, vpd_list) {
+		list_del(&vpd->vpd_list);
+		kfree(vpd);
+	}
+	spin_unlock(&dev->t10_wwn.t10_vpd_lock);
+}
+
+static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
+{
+	u32 aligned_max_sectors;
+	u32 alignment;
+	/*
+	 * Limit max_sectors to a PAGE_SIZE aligned value for modern
+	 * transport_allocate_data_tasks() operation.
+	 */
+	alignment = max(1ul, PAGE_SIZE / block_size);
+	aligned_max_sectors = rounddown(max_sectors, alignment);
+
+	if (max_sectors != aligned_max_sectors)
+		pr_info("Rounding down aligned max_sectors from %u to %u\n",
+			max_sectors, aligned_max_sectors);
+
+	return aligned_max_sectors;
+}
+
+int core_dev_add_lun(
+	struct se_portal_group *tpg,
+	struct se_device *dev,
+	struct se_lun *lun)
+{
+	int rc;
+
+	rc = core_tpg_add_lun(tpg, lun, false, dev);
+	if (rc < 0)
+		return rc;
+
+	pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
+		" CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
+		tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
+	/*
+	 * Update LUN maps for dynamically added initiators when
+	 * generate_node_acl is enabled.
+	 */
+	if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
+		struct se_node_acl *acl;
+
+		mutex_lock(&tpg->acl_node_mutex);
+		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
+			if (acl->dynamic_node_acl &&
+			    (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
+			     !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
+				core_tpg_add_node_to_devs(acl, tpg, lun);
+			}
+		}
+		mutex_unlock(&tpg->acl_node_mutex);
+	}
+
+	return 0;
+}
+
+/*      core_dev_del_lun():
+ *
+ *
+ */
+void core_dev_del_lun(
+	struct se_portal_group *tpg,
+	struct se_lun *lun)
+{
+	pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
+		" device object\n", tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
+		tpg->se_tpg_tfo->fabric_name);
+
+	core_tpg_remove_lun(tpg, lun);
+}
+
+struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	struct se_node_acl *nacl,
+	u64 mapped_lun,
+	int *ret)
+{
+	struct se_lun_acl *lacl;
+
+	if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
+		pr_err("%s InitiatorName exceeds maximum size.\n",
+			tpg->se_tpg_tfo->fabric_name);
+		*ret = -EOVERFLOW;
+		return NULL;
+	}
+	lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
+	if (!lacl) {
+		pr_err("Unable to allocate memory for struct se_lun_acl.\n");
+		*ret = -ENOMEM;
+		return NULL;
+	}
+
+	lacl->mapped_lun = mapped_lun;
+	lacl->se_lun_nacl = nacl;
+
+	return lacl;
+}
+
+int core_dev_add_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	struct se_lun_acl *lacl,
+	struct se_lun *lun,
+	bool lun_access_ro)
+{
+	struct se_node_acl *nacl = lacl->se_lun_nacl;
+	/*
+	 * rcu_dereference_raw protected by se_lun->lun_group symlink
+	 * reference to se_device->dev_group.
+	 */
+	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
+
+	if (!nacl)
+		return -EINVAL;
+
+	if (lun->lun_access_ro)
+		lun_access_ro = true;
+
+	lacl->se_lun = lun;
+
+	if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
+			lun_access_ro, nacl, tpg) < 0)
+		return -EINVAL;
+
+	pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
+		" InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
+		lun_access_ro ? "RO" : "RW",
+		nacl->initiatorname);
+	/*
+	 * Check to see if there are any existing persistent reservation APTPL
+	 * pre-registrations that need to be enabled for this LUN ACL..
+	 */
+	core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
+					    lacl->mapped_lun);
+	return 0;
+}
+
+int core_dev_del_initiator_node_lun_acl(
+	struct se_lun *lun,
+	struct se_lun_acl *lacl)
+{
+	struct se_portal_group *tpg = lun->lun_tpg;
+	struct se_node_acl *nacl;
+	struct se_dev_entry *deve;
+
+	nacl = lacl->se_lun_nacl;
+	if (!nacl)
+		return -EINVAL;
+
+	mutex_lock(&nacl->lun_entry_mutex);
+	deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
+	if (deve)
+		core_disable_device_list_for_node(lun, deve, nacl, tpg);
+	mutex_unlock(&nacl->lun_entry_mutex);
+
+	pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
+		" InitiatorNode: %s Mapped LUN: %llu\n",
+		tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
+		nacl->initiatorname, lacl->mapped_lun);
+
+	return 0;
+}
+
+void core_dev_free_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	struct se_lun_acl *lacl)
+{
+	pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
+		" Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg),
+		tpg->se_tpg_tfo->fabric_name,
+		lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
+
+	kfree(lacl);
+}
+
+static void scsi_dump_inquiry(struct se_device *dev)
+{
+	struct t10_wwn *wwn = &dev->t10_wwn;
+	int device_type = dev->transport->get_device_type(dev);
+
+	/*
+	 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
+	 */
+	pr_debug("  Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
+		wwn->vendor);
+	pr_debug("  Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
+		wwn->model);
+	pr_debug("  Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
+		wwn->revision);
+	pr_debug("  Type:   %s ", scsi_device_type(device_type));
+}
+
+struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
+{
+	struct se_device *dev;
+	struct se_lun *xcopy_lun;
+	int i;
+
+	dev = hba->backend->ops->alloc_device(hba, name);
+	if (!dev)
+		return NULL;
+
+	dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
+	if (!dev->queues) {
+		dev->transport->free_device(dev);
+		return NULL;
+	}
+
+	dev->queue_cnt = nr_cpu_ids;
+	for (i = 0; i < dev->queue_cnt; i++) {
+		struct se_device_queue *q;
+
+		q = &dev->queues[i];
+		INIT_LIST_HEAD(&q->state_list);
+		spin_lock_init(&q->lock);
+
+		init_llist_head(&q->sq.cmd_list);
+		INIT_WORK(&q->sq.work, target_queued_submit_work);
+	}
+
+	dev->se_hba = hba;
+	dev->transport = hba->backend->ops;
+	dev->transport_flags = dev->transport->transport_flags_default;
+	dev->prot_length = sizeof(struct t10_pi_tuple);
+	dev->hba_index = hba->hba_index;
+
+	INIT_LIST_HEAD(&dev->dev_sep_list);
+	INIT_LIST_HEAD(&dev->dev_tmr_list);
+	INIT_LIST_HEAD(&dev->delayed_cmd_list);
+	INIT_LIST_HEAD(&dev->qf_cmd_list);
+	spin_lock_init(&dev->delayed_cmd_lock);
+	spin_lock_init(&dev->dev_reservation_lock);
+	spin_lock_init(&dev->se_port_lock);
+	spin_lock_init(&dev->se_tmr_lock);
+	spin_lock_init(&dev->qf_cmd_lock);
+	sema_init(&dev->caw_sem, 1);
+	INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
+	spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
+	INIT_LIST_HEAD(&dev->t10_pr.registration_list);
+	INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
+	spin_lock_init(&dev->t10_pr.registration_lock);
+	spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
+	INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
+	spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
+	INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
+	spin_lock_init(&dev->t10_alua.lba_map_lock);
+
+	INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
+
+	dev->t10_wwn.t10_dev = dev;
+	/*
+	 * Use OpenFabrics IEEE Company ID: 00 14 05
+	 */
+	dev->t10_wwn.company_id = 0x001405;
+
+	dev->t10_alua.t10_dev = dev;
+
+	dev->dev_attrib.da_dev = dev;
+	dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
+	dev->dev_attrib.emulate_dpo = 1;
+	dev->dev_attrib.emulate_fua_write = 1;
+	dev->dev_attrib.emulate_fua_read = 1;
+	dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
+	dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
+	dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
+	dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
+	dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
+	dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
+	dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
+	dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
+	dev->dev_attrib.emulate_rsoc = DA_EMULATE_RSOC;
+	dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
+	dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
+	dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
+	dev->dev_attrib.is_nonrot = DA_IS_NONROT;
+	dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
+	dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
+	dev->dev_attrib.max_unmap_block_desc_count =
+		DA_MAX_UNMAP_BLOCK_DESC_COUNT;
+	dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
+	dev->dev_attrib.unmap_granularity_alignment =
+				DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
+	dev->dev_attrib.unmap_zeroes_data =
+				DA_UNMAP_ZEROES_DATA_DEFAULT;
+	dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
+
+	xcopy_lun = &dev->xcopy_lun;
+	rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
+	init_completion(&xcopy_lun->lun_shutdown_comp);
+	INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
+	INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
+	mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
+	xcopy_lun->lun_tpg = &xcopy_pt_tpg;
+
+	/* Preload the default INQUIRY const values */
+	strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
+	strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
+		sizeof(dev->t10_wwn.model));
+	strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
+		sizeof(dev->t10_wwn.revision));
+
+	return dev;
+}
+
+/*
+ * Check if the underlying struct block_device supports discard and if yes
+ * configure the UNMAP parameters.
+ */
+bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
+				       struct block_device *bdev)
+{
+	int block_size = bdev_logical_block_size(bdev);
+
+	if (!bdev_max_discard_sectors(bdev))
+		return false;
+
+	attrib->max_unmap_lba_count =
+		bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
+	/*
+	 * Currently hardcoded to 1 in Linux/SCSI code..
+	 */
+	attrib->max_unmap_block_desc_count = 1;
+	attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size;
+	attrib->unmap_granularity_alignment =
+		bdev_discard_alignment(bdev) / block_size;
+	return true;
+}
+EXPORT_SYMBOL(target_configure_unmap_from_queue);
+
+/*
+ * Convert from blocksize advertised to the initiator to the 512 byte
+ * units unconditionally used by the Linux block layer.
+ */
+sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
+{
+	switch (dev->dev_attrib.block_size) {
+	case 4096:
+		return lb << 3;
+	case 2048:
+		return lb << 2;
+	case 1024:
+		return lb << 1;
+	default:
+		return lb;
+	}
+}
+EXPORT_SYMBOL(target_to_linux_sector);
+
+struct devices_idr_iter {
+	struct config_item *prev_item;
+	int (*fn)(struct se_device *dev, void *data);
+	void *data;
+};
+
+static int target_devices_idr_iter(int id, void *p, void *data)
+	 __must_hold(&device_mutex)
+{
+	struct devices_idr_iter *iter = data;
+	struct se_device *dev = p;
+	int ret;
+
+	config_item_put(iter->prev_item);
+	iter->prev_item = NULL;
+
+	/*
+	 * We add the device early to the idr, so it can be used
+	 * by backend modules during configuration. We do not want
+	 * to allow other callers to access partially setup devices,
+	 * so we skip them here.
+	 */
+	if (!target_dev_configured(dev))
+		return 0;
+
+	iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
+	if (!iter->prev_item)
+		return 0;
+	mutex_unlock(&device_mutex);
+
+	ret = iter->fn(dev, iter->data);
+
+	mutex_lock(&device_mutex);
+	return ret;
+}
+
+/**
+ * target_for_each_device - iterate over configured devices
+ * @fn: iterator function
+ * @data: pointer to data that will be passed to fn
+ *
+ * fn must return 0 to continue looping over devices. non-zero will break
+ * from the loop and return that value to the caller.
+ */
+int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
+			   void *data)
+{
+	struct devices_idr_iter iter = { .fn = fn, .data = data };
+	int ret;
+
+	mutex_lock(&device_mutex);
+	ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
+	mutex_unlock(&device_mutex);
+	config_item_put(iter.prev_item);
+	return ret;
+}
+
+int target_configure_device(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+	int ret, id;
+
+	if (target_dev_configured(dev)) {
+		pr_err("se_dev->se_dev_ptr already set for storage"
+				" object\n");
+		return -EEXIST;
+	}
+
+	/*
+	 * Add early so modules like tcmu can use during its
+	 * configuration.
+	 */
+	mutex_lock(&device_mutex);
+	/*
+	 * Use cyclic to try and avoid collisions with devices
+	 * that were recently removed.
+	 */
+	id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
+	mutex_unlock(&device_mutex);
+	if (id < 0) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	dev->dev_index = id;
+
+	ret = dev->transport->configure_device(dev);
+	if (ret)
+		goto out_free_index;
+
+	if (dev->transport->configure_unmap &&
+	    dev->transport->configure_unmap(dev)) {
+		pr_debug("Discard support available, but disabled by default.\n");
+	}
+
+	/*
+	 * XXX: there is not much point to have two different values here..
+	 */
+	dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
+	dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
+
+	/*
+	 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
+	 */
+	dev->dev_attrib.hw_max_sectors =
+		se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
+					 dev->dev_attrib.hw_block_size);
+	dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
+
+	dev->creation_time = get_jiffies_64();
+
+	ret = core_setup_alua(dev);
+	if (ret)
+		goto out_destroy_device;
+
+	/*
+	 * Setup work_queue for QUEUE_FULL
+	 */
+	INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
+
+	scsi_dump_inquiry(dev);
+
+	spin_lock(&hba->device_lock);
+	hba->dev_count++;
+	spin_unlock(&hba->device_lock);
+
+	dev->dev_flags |= DF_CONFIGURED;
+
+	return 0;
+
+out_destroy_device:
+	dev->transport->destroy_device(dev);
+out_free_index:
+	mutex_lock(&device_mutex);
+	idr_remove(&devices_idr, dev->dev_index);
+	mutex_unlock(&device_mutex);
+out:
+	se_release_vpd_for_dev(dev);
+	return ret;
+}
+
+void target_free_device(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+
+	WARN_ON(!list_empty(&dev->dev_sep_list));
+
+	if (target_dev_configured(dev)) {
+		dev->transport->destroy_device(dev);
+
+		mutex_lock(&device_mutex);
+		idr_remove(&devices_idr, dev->dev_index);
+		mutex_unlock(&device_mutex);
+
+		spin_lock(&hba->device_lock);
+		hba->dev_count--;
+		spin_unlock(&hba->device_lock);
+	}
+
+	core_alua_free_lu_gp_mem(dev);
+	core_alua_set_lba_map(dev, NULL, 0, 0);
+	core_scsi3_free_all_registrations(dev);
+	se_release_vpd_for_dev(dev);
+
+	if (dev->transport->free_prot)
+		dev->transport->free_prot(dev);
+
+	kfree(dev->queues);
+	dev->transport->free_device(dev);
+}
+
+int core_dev_setup_virtual_lun0(void)
+{
+	struct se_hba *hba;
+	struct se_device *dev;
+	char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1";
+	int ret;
+
+	hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
+	if (IS_ERR(hba))
+		return PTR_ERR(hba);
+
+	dev = target_alloc_device(hba, "virt_lun0");
+	if (!dev) {
+		ret = -ENOMEM;
+		goto out_free_hba;
+	}
+
+	hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
+
+	ret = target_configure_device(dev);
+	if (ret)
+		goto out_free_se_dev;
+
+	lun0_hba = hba;
+	g_lun0_dev = dev;
+	return 0;
+
+out_free_se_dev:
+	target_free_device(dev);
+out_free_hba:
+	core_delete_hba(hba);
+	return ret;
+}
+
+
+void core_dev_release_virtual_lun0(void)
+{
+	struct se_hba *hba = lun0_hba;
+
+	if (!hba)
+		return;
+
+	if (g_lun0_dev)
+		target_free_device(g_lun0_dev);
+	core_delete_hba(hba);
+}
+
+/*
+ * Common CDB parsing for kernel and user passthrough.
+ */
+sense_reason_t
+passthrough_parse_cdb(struct se_cmd *cmd,
+	sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
+{
+	unsigned char *cdb = cmd->t_task_cdb;
+	struct se_device *dev = cmd->se_dev;
+	unsigned int size;
+
+	/*
+	 * For REPORT LUNS we always need to emulate the response, for everything
+	 * else, pass it up.
+	 */
+	if (cdb[0] == REPORT_LUNS) {
+		cmd->execute_cmd = spc_emulate_report_luns;
+		return TCM_NO_SENSE;
+	}
+
+	/*
+	 * With emulate_pr disabled, all reservation requests should fail,
+	 * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
+	 */
+	if (!dev->dev_attrib.emulate_pr &&
+	    ((cdb[0] == PERSISTENT_RESERVE_IN) ||
+	     (cdb[0] == PERSISTENT_RESERVE_OUT) ||
+	     (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
+	     (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
+		return TCM_UNSUPPORTED_SCSI_OPCODE;
+	}
+
+	/*
+	 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
+	 * emulate the response, since tcmu does not have the information
+	 * required to process these commands.
+	 */
+	if (!(dev->transport_flags &
+	      TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
+		if (cdb[0] == PERSISTENT_RESERVE_IN) {
+			cmd->execute_cmd = target_scsi3_emulate_pr_in;
+			size = get_unaligned_be16(&cdb[7]);
+			return target_cmd_size_check(cmd, size);
+		}
+		if (cdb[0] == PERSISTENT_RESERVE_OUT) {
+			cmd->execute_cmd = target_scsi3_emulate_pr_out;
+			size = get_unaligned_be32(&cdb[5]);
+			return target_cmd_size_check(cmd, size);
+		}
+
+		if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
+			cmd->execute_cmd = target_scsi2_reservation_release;
+			if (cdb[0] == RELEASE_10)
+				size = get_unaligned_be16(&cdb[7]);
+			else
+				size = cmd->data_length;
+			return target_cmd_size_check(cmd, size);
+		}
+		if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
+			cmd->execute_cmd = target_scsi2_reservation_reserve;
+			if (cdb[0] == RESERVE_10)
+				size = get_unaligned_be16(&cdb[7]);
+			else
+				size = cmd->data_length;
+			return target_cmd_size_check(cmd, size);
+		}
+	}
+
+	/* Set DATA_CDB flag for ops that should have it */
+	switch (cdb[0]) {
+	case READ_6:
+	case READ_10:
+	case READ_12:
+	case READ_16:
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_12:
+	case WRITE_16:
+	case WRITE_VERIFY:
+	case WRITE_VERIFY_12:
+	case WRITE_VERIFY_16:
+	case COMPARE_AND_WRITE:
+	case XDWRITEREAD_10:
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+		break;
+	case VARIABLE_LENGTH_CMD:
+		switch (get_unaligned_be16(&cdb[8])) {
+		case READ_32:
+		case WRITE_32:
+		case WRITE_VERIFY_32:
+		case XDWRITEREAD_32:
+			cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+			break;
+		}
+	}
+
+	cmd->execute_cmd = exec_cmd;
+
+	return TCM_NO_SENSE;
+}
+EXPORT_SYMBOL(passthrough_parse_cdb);