From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- drivers/target/target_core_tpg.c | 652 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 652 insertions(+) create mode 100644 drivers/target/target_core_tpg.c (limited to 'drivers/target/target_core_tpg.c') 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 + * + ******************************************************************************/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#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); +} -- cgit v1.2.3