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, 652 insertions, 0 deletions

diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
new file mode 100644
index 000000000..736847c93
--- /dev/null
+++ b/drivers/target/target_core_tpg.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*******************************************************************************
+ * Filename:  target_core_tpg.c
+ *
+ * This file contains generic Target Portal Group related functions.
+ *
+ * (c) Copyright 2002-2013 Datera, Inc.
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/in.h>
+#include <linux/export.h>
+#include <net/sock.h>
+#include <net/tcp.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"
+
+extern struct se_device *g_lun0_dev;
+
+/*	__core_tpg_get_initiator_node_acl():
+ *
+ *	mutex_lock(&tpg->acl_node_mutex); must be held when calling
+ */
+struct se_node_acl *__core_tpg_get_initiator_node_acl(
+	struct se_portal_group *tpg,
+	const char *initiatorname)
+{
+	struct se_node_acl *acl;
+
+	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
+		if (!strcmp(acl->initiatorname, initiatorname))
+			return acl;
+	}
+
+	return NULL;
+}
+
+/*	core_tpg_get_initiator_node_acl():
+ *
+ *
+ */
+struct se_node_acl *core_tpg_get_initiator_node_acl(
+	struct se_portal_group *tpg,
+	unsigned char *initiatorname)
+{
+	struct se_node_acl *acl;
+	/*
+	 * Obtain se_node_acl->acl_kref using fabric driver provided
+	 * initiatorname[] during node acl endpoint lookup driven by
+	 * new se_session login.
+	 *
+	 * The reference is held until se_session shutdown -> release
+	 * occurs via fabric driver invoked transport_deregister_session()
+	 * or transport_free_session() code.
+	 */
+	mutex_lock(&tpg->acl_node_mutex);
+	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if (acl) {
+		if (!kref_get_unless_zero(&acl->acl_kref))
+			acl = NULL;
+	}
+	mutex_unlock(&tpg->acl_node_mutex);
+
+	return acl;
+}
+EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
+
+void core_allocate_nexus_loss_ua(
+	struct se_node_acl *nacl)
+{
+	struct se_dev_entry *deve;
+
+	if (!nacl)
+		return;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
+		core_scsi3_ua_allocate(deve, 0x29,
+			ASCQ_29H_NEXUS_LOSS_OCCURRED);
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL(core_allocate_nexus_loss_ua);
+
+/*	core_tpg_add_node_to_devs():
+ *
+ *
+ */
+void core_tpg_add_node_to_devs(
+	struct se_node_acl *acl,
+	struct se_portal_group *tpg,
+	struct se_lun *lun_orig)
+{
+	bool lun_access_ro = true;
+	struct se_lun *lun;
+	struct se_device *dev;
+
+	mutex_lock(&tpg->tpg_lun_mutex);
+	hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) {
+		if (lun_orig && lun != lun_orig)
+			continue;
+
+		dev = rcu_dereference_check(lun->lun_se_dev,
+					    lockdep_is_held(&tpg->tpg_lun_mutex));
+		/*
+		 * By default in LIO-Target $FABRIC_MOD,
+		 * demo_mode_write_protect is ON, or READ_ONLY;
+		 */
+		if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
+			lun_access_ro = false;
+		} else {
+			/*
+			 * Allow only optical drives to issue R/W in default RO
+			 * demo mode.
+			 */
+			if (dev->transport->get_device_type(dev) == TYPE_DISK)
+				lun_access_ro = true;
+			else
+				lun_access_ro = false;
+		}
+
+		pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s"
+			" access for LUN in Demo Mode\n",
+			tpg->se_tpg_tfo->fabric_name,
+			tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
+			lun_access_ro ? "READ-ONLY" : "READ-WRITE");
+
+		core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
+						 lun_access_ro, acl, tpg);
+		/*
+		 * Check to see if there are any existing persistent reservation
+		 * APTPL pre-registrations that need to be enabled for this dynamic
+		 * LUN ACL now..
+		 */
+		core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
+						    lun->unpacked_lun);
+	}
+	mutex_unlock(&tpg->tpg_lun_mutex);
+}
+
+static void
+target_set_nacl_queue_depth(struct se_portal_group *tpg,
+			    struct se_node_acl *acl, u32 queue_depth)
+{
+	acl->queue_depth = queue_depth;
+
+	if (!acl->queue_depth) {
+		pr_warn("Queue depth for %s Initiator Node: %s is 0,"
+			"defaulting to 1.\n", tpg->se_tpg_tfo->fabric_name,
+			acl->initiatorname);
+		acl->queue_depth = 1;
+	}
+}
+
+static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
+		const unsigned char *initiatorname)
+{
+	struct se_node_acl *acl;
+	u32 queue_depth;
+
+	acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
+			GFP_KERNEL);
+	if (!acl)
+		return NULL;
+
+	INIT_LIST_HEAD(&acl->acl_list);
+	INIT_LIST_HEAD(&acl->acl_sess_list);
+	INIT_HLIST_HEAD(&acl->lun_entry_hlist);
+	kref_init(&acl->acl_kref);
+	init_completion(&acl->acl_free_comp);
+	spin_lock_init(&acl->nacl_sess_lock);
+	mutex_init(&acl->lun_entry_mutex);
+	atomic_set(&acl->acl_pr_ref_count, 0);
+
+	if (tpg->se_tpg_tfo->tpg_get_default_depth)
+		queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
+	else
+		queue_depth = 1;
+	target_set_nacl_queue_depth(tpg, acl, queue_depth);
+
+	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
+	acl->se_tpg = tpg;
+	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
+
+	tpg->se_tpg_tfo->set_default_node_attributes(acl);
+
+	return acl;
+}
+
+static void target_add_node_acl(struct se_node_acl *acl)
+{
+	struct se_portal_group *tpg = acl->se_tpg;
+
+	mutex_lock(&tpg->acl_node_mutex);
+	list_add_tail(&acl->acl_list, &tpg->acl_node_list);
+	mutex_unlock(&tpg->acl_node_mutex);
+
+	pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
+		" Initiator Node: %s\n",
+		tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg),
+		acl->dynamic_node_acl ? "DYNAMIC" : "",
+		acl->queue_depth,
+		tpg->se_tpg_tfo->fabric_name,
+		acl->initiatorname);
+}
+
+bool target_tpg_has_node_acl(struct se_portal_group *tpg,
+			     const char *initiatorname)
+{
+	struct se_node_acl *acl;
+	bool found = false;
+
+	mutex_lock(&tpg->acl_node_mutex);
+	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
+		if (!strcmp(acl->initiatorname, initiatorname)) {
+			found = true;
+			break;
+		}
+	}
+	mutex_unlock(&tpg->acl_node_mutex);
+
+	return found;
+}
+EXPORT_SYMBOL(target_tpg_has_node_acl);
+
+struct se_node_acl *core_tpg_check_initiator_node_acl(
+	struct se_portal_group *tpg,
+	unsigned char *initiatorname)
+{
+	struct se_node_acl *acl;
+
+	acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if (acl)
+		return acl;
+
+	if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
+		return NULL;
+
+	acl = target_alloc_node_acl(tpg, initiatorname);
+	if (!acl)
+		return NULL;
+	/*
+	 * When allocating a dynamically generated node_acl, go ahead
+	 * and take the extra kref now before returning to the fabric
+	 * driver caller.
+	 *
+	 * Note this reference will be released at session shutdown
+	 * time within transport_free_session() code.
+	 */
+	kref_get(&acl->acl_kref);
+	acl->dynamic_node_acl = 1;
+
+	/*
+	 * Here we only create demo-mode MappedLUNs from the active
+	 * TPG LUNs if the fabric is not explicitly asking for
+	 * tpg_check_demo_mode_login_only() == 1.
+	 */
+	if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
+	    (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
+		core_tpg_add_node_to_devs(acl, tpg, NULL);
+
+	target_add_node_acl(acl);
+	return acl;
+}
+EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
+
+void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
+{
+	while (atomic_read(&nacl->acl_pr_ref_count) != 0)
+		cpu_relax();
+}
+
+struct se_node_acl *core_tpg_add_initiator_node_acl(
+	struct se_portal_group *tpg,
+	const char *initiatorname)
+{
+	struct se_node_acl *acl;
+
+	mutex_lock(&tpg->acl_node_mutex);
+	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if (acl) {
+		if (acl->dynamic_node_acl) {
+			acl->dynamic_node_acl = 0;
+			pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
+				" for %s\n", tpg->se_tpg_tfo->fabric_name,
+				tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
+			mutex_unlock(&tpg->acl_node_mutex);
+			return acl;
+		}
+
+		pr_err("ACL entry for %s Initiator"
+			" Node %s already exists for TPG %u, ignoring"
+			" request.\n",  tpg->se_tpg_tfo->fabric_name,
+			initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
+		mutex_unlock(&tpg->acl_node_mutex);
+		return ERR_PTR(-EEXIST);
+	}
+	mutex_unlock(&tpg->acl_node_mutex);
+
+	acl = target_alloc_node_acl(tpg, initiatorname);
+	if (!acl)
+		return ERR_PTR(-ENOMEM);
+
+	target_add_node_acl(acl);
+	return acl;
+}
+
+static void target_shutdown_sessions(struct se_node_acl *acl)
+{
+	struct se_session *sess;
+	unsigned long flags;
+
+restart:
+	spin_lock_irqsave(&acl->nacl_sess_lock, flags);
+	list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) {
+		if (atomic_read(&sess->stopped))
+			continue;
+
+		list_del_init(&sess->sess_acl_list);
+		spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
+
+		if (acl->se_tpg->se_tpg_tfo->close_session)
+			acl->se_tpg->se_tpg_tfo->close_session(sess);
+		goto restart;
+	}
+	spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
+}
+
+void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
+{
+	struct se_portal_group *tpg = acl->se_tpg;
+
+	mutex_lock(&tpg->acl_node_mutex);
+	if (acl->dynamic_node_acl)
+		acl->dynamic_node_acl = 0;
+	list_del_init(&acl->acl_list);
+	mutex_unlock(&tpg->acl_node_mutex);
+
+	target_shutdown_sessions(acl);
+
+	target_put_nacl(acl);
+	/*
+	 * Wait for last target_put_nacl() to complete in target_complete_nacl()
+	 * for active fabric session transport_deregister_session() callbacks.
+	 */
+	wait_for_completion(&acl->acl_free_comp);
+
+	core_tpg_wait_for_nacl_pr_ref(acl);
+	core_free_device_list_for_node(acl, tpg);
+
+	pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
+		" Initiator Node: %s\n", tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
+		tpg->se_tpg_tfo->fabric_name, acl->initiatorname);
+
+	kfree(acl);
+}
+
+/*	core_tpg_set_initiator_node_queue_depth():
+ *
+ *
+ */
+int core_tpg_set_initiator_node_queue_depth(
+	struct se_node_acl *acl,
+	u32 queue_depth)
+{
+	struct se_portal_group *tpg = acl->se_tpg;
+
+	/*
+	 * Allow the setting of se_node_acl queue_depth to be idempotent,
+	 * and not force a session shutdown event if the value is not
+	 * changing.
+	 */
+	if (acl->queue_depth == queue_depth)
+		return 0;
+	/*
+	 * User has requested to change the queue depth for a Initiator Node.
+	 * Change the value in the Node's struct se_node_acl, and call
+	 * target_set_nacl_queue_depth() to set the new queue depth.
+	 */
+	target_set_nacl_queue_depth(tpg, acl, queue_depth);
+
+	/*
+	 * Shutdown all pending sessions to force session reinstatement.
+	 */
+	target_shutdown_sessions(acl);
+
+	pr_debug("Successfully changed queue depth to: %d for Initiator"
+		" Node: %s on %s Target Portal Group: %u\n", acl->queue_depth,
+		acl->initiatorname, tpg->se_tpg_tfo->fabric_name,
+		tpg->se_tpg_tfo->tpg_get_tag(tpg));
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
+
+/*	core_tpg_set_initiator_node_tag():
+ *
+ *	Initiator nodeacl tags are not used internally, but may be used by
+ *	userspace to emulate aliases or groups.
+ *	Returns length of newly-set tag or -EINVAL.
+ */
+int core_tpg_set_initiator_node_tag(
+	struct se_portal_group *tpg,
+	struct se_node_acl *acl,
+	const char *new_tag)
+{
+	if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
+		return -EINVAL;
+
+	if (!strncmp("NULL", new_tag, 4)) {
+		acl->acl_tag[0] = '\0';
+		return 0;
+	}
+
+	return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
+}
+EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
+
+static void core_tpg_lun_ref_release(struct percpu_ref *ref)
+{
+	struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
+
+	complete(&lun->lun_shutdown_comp);
+}
+
+/* Does not change se_wwn->priv. */
+int core_tpg_register(
+	struct se_wwn *se_wwn,
+	struct se_portal_group *se_tpg,
+	int proto_id)
+{
+	int ret;
+
+	if (!se_tpg)
+		return -EINVAL;
+	/*
+	 * For the typical case where core_tpg_register() is called by a
+	 * fabric driver from target_core_fabric_ops->fabric_make_tpg()
+	 * configfs context, use the original tf_ops pointer already saved
+	 * by target-core in target_fabric_make_wwn().
+	 *
+	 * Otherwise, for special cases like iscsi-target discovery TPGs
+	 * the caller is responsible for setting ->se_tpg_tfo ahead of
+	 * calling core_tpg_register().
+	 */
+	if (se_wwn)
+		se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops;
+
+	if (!se_tpg->se_tpg_tfo) {
+		pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n");
+		return -EINVAL;
+	}
+
+	INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist);
+	se_tpg->proto_id = proto_id;
+	se_tpg->se_tpg_wwn = se_wwn;
+	atomic_set(&se_tpg->tpg_pr_ref_count, 0);
+	INIT_LIST_HEAD(&se_tpg->acl_node_list);
+	INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
+	spin_lock_init(&se_tpg->session_lock);
+	mutex_init(&se_tpg->tpg_lun_mutex);
+	mutex_init(&se_tpg->acl_node_mutex);
+
+	if (se_tpg->proto_id >= 0) {
+		se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0);
+		if (IS_ERR(se_tpg->tpg_virt_lun0))
+			return PTR_ERR(se_tpg->tpg_virt_lun0);
+
+		ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0,
+				true, g_lun0_dev);
+		if (ret < 0) {
+			kfree(se_tpg->tpg_virt_lun0);
+			return ret;
+		}
+	}
+
+	pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, "
+		 "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->fabric_name,
+		se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ?
+		se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL,
+		se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_register);
+
+int core_tpg_deregister(struct se_portal_group *se_tpg)
+{
+	const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
+	struct se_node_acl *nacl, *nacl_tmp;
+	LIST_HEAD(node_list);
+
+	pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, "
+		 "Proto: %d, Portal Tag: %u\n", tfo->fabric_name,
+		tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
+		se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
+
+	while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
+		cpu_relax();
+
+	mutex_lock(&se_tpg->acl_node_mutex);
+	list_splice_init(&se_tpg->acl_node_list, &node_list);
+	mutex_unlock(&se_tpg->acl_node_mutex);
+	/*
+	 * Release any remaining demo-mode generated se_node_acl that have
+	 * not been released because of TFO->tpg_check_demo_mode_cache() == 1
+	 * in transport_deregister_session().
+	 */
+	list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) {
+		list_del_init(&nacl->acl_list);
+
+		core_tpg_wait_for_nacl_pr_ref(nacl);
+		core_free_device_list_for_node(nacl, se_tpg);
+		kfree(nacl);
+	}
+
+	if (se_tpg->proto_id >= 0) {
+		core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0);
+		kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_deregister);
+
+struct se_lun *core_tpg_alloc_lun(
+	struct se_portal_group *tpg,
+	u64 unpacked_lun)
+{
+	struct se_lun *lun;
+
+	lun = kzalloc(sizeof(*lun), GFP_KERNEL);
+	if (!lun) {
+		pr_err("Unable to allocate se_lun memory\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	lun->unpacked_lun = unpacked_lun;
+	atomic_set(&lun->lun_acl_count, 0);
+	init_completion(&lun->lun_shutdown_comp);
+	INIT_LIST_HEAD(&lun->lun_deve_list);
+	INIT_LIST_HEAD(&lun->lun_dev_link);
+	atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
+	spin_lock_init(&lun->lun_deve_lock);
+	mutex_init(&lun->lun_tg_pt_md_mutex);
+	INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link);
+	spin_lock_init(&lun->lun_tg_pt_gp_lock);
+	lun->lun_tpg = tpg;
+
+	return lun;
+}
+
+int core_tpg_add_lun(
+	struct se_portal_group *tpg,
+	struct se_lun *lun,
+	bool lun_access_ro,
+	struct se_device *dev)
+{
+	int ret;
+
+	ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
+			      GFP_KERNEL);
+	if (ret < 0)
+		goto out;
+
+	ret = core_alloc_rtpi(lun, dev);
+	if (ret)
+		goto out_kill_ref;
+
+	if (!(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
+	    !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
+		target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp);
+
+	mutex_lock(&tpg->tpg_lun_mutex);
+
+	spin_lock(&dev->se_port_lock);
+	lun->lun_index = dev->dev_index;
+	rcu_assign_pointer(lun->lun_se_dev, dev);
+	dev->export_count++;
+	list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list);
+	spin_unlock(&dev->se_port_lock);
+
+	if (dev->dev_flags & DF_READ_ONLY)
+		lun->lun_access_ro = true;
+	else
+		lun->lun_access_ro = lun_access_ro;
+	if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
+		hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist);
+	mutex_unlock(&tpg->tpg_lun_mutex);
+
+	return 0;
+
+out_kill_ref:
+	percpu_ref_exit(&lun->lun_ref);
+out:
+	return ret;
+}
+
+void core_tpg_remove_lun(
+	struct se_portal_group *tpg,
+	struct se_lun *lun)
+{
+	/*
+	 * 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);
+
+	lun->lun_shutdown = true;
+
+	core_clear_lun_from_tpg(lun, tpg);
+	/*
+	 * Wait for any active I/O references to percpu se_lun->lun_ref to
+	 * be released.  Also, se_lun->lun_ref is now used by PR and ALUA
+	 * logic when referencing a remote target port during ALL_TGT_PT=1
+	 * and generating UNIT_ATTENTIONs for ALUA access state transition.
+	 */
+	transport_clear_lun_ref(lun);
+
+	mutex_lock(&tpg->tpg_lun_mutex);
+	if (lun->lun_se_dev) {
+		target_detach_tg_pt_gp(lun);
+
+		spin_lock(&dev->se_port_lock);
+		list_del(&lun->lun_dev_link);
+		dev->export_count--;
+		rcu_assign_pointer(lun->lun_se_dev, NULL);
+		spin_unlock(&dev->se_port_lock);
+	}
+	if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
+		hlist_del_rcu(&lun->link);
+
+	lun->lun_shutdown = false;
+	mutex_unlock(&tpg->tpg_lun_mutex);
+
+	percpu_ref_exit(&lun->lun_ref);
+}