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_tmr.c | 410 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 410 insertions(+) create mode 100644 drivers/target/target_core_tmr.c (limited to 'drivers/target/target_core_tmr.c') diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c new file mode 100644 index 000000000..2b95b4550 --- /dev/null +++ b/drivers/target/target_core_tmr.c @@ -0,0 +1,410 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/******************************************************************************* + * Filename: target_core_tmr.c + * + * This file contains SPC-3 task management infrastructure + * + * (c) Copyright 2009-2013 Datera, Inc. + * + * Nicholas A. Bellinger + * + ******************************************************************************/ + +#include +#include +#include +#include + +#include +#include +#include + +#include "target_core_internal.h" +#include "target_core_alua.h" +#include "target_core_pr.h" + +int core_tmr_alloc_req( + struct se_cmd *se_cmd, + void *fabric_tmr_ptr, + u8 function, + gfp_t gfp_flags) +{ + struct se_tmr_req *tmr; + + tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); + if (!tmr) { + pr_err("Unable to allocate struct se_tmr_req\n"); + return -ENOMEM; + } + + se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; + se_cmd->se_tmr_req = tmr; + tmr->task_cmd = se_cmd; + tmr->fabric_tmr_ptr = fabric_tmr_ptr; + tmr->function = function; + INIT_LIST_HEAD(&tmr->tmr_list); + + return 0; +} +EXPORT_SYMBOL(core_tmr_alloc_req); + +void core_tmr_release_req(struct se_tmr_req *tmr) +{ + kfree(tmr); +} + +static int target_check_cdb_and_preempt(struct list_head *list, + struct se_cmd *cmd) +{ + struct t10_pr_registration *reg; + + if (!list) + return 0; + list_for_each_entry(reg, list, pr_reg_abort_list) { + if (reg->pr_res_key == cmd->pr_res_key) + return 0; + } + + return 1; +} + +static bool __target_check_io_state(struct se_cmd *se_cmd, + struct se_session *tmr_sess, bool tas) +{ + struct se_session *sess = se_cmd->se_sess; + + lockdep_assert_held(&sess->sess_cmd_lock); + + /* + * If command already reached CMD_T_COMPLETE state within + * target_complete_cmd() or CMD_T_FABRIC_STOP due to shutdown, + * this se_cmd has been passed to fabric driver and will + * not be aborted. + * + * Otherwise, obtain a local se_cmd->cmd_kref now for TMR + * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as + * long as se_cmd->cmd_kref is still active unless zero. + */ + spin_lock(&se_cmd->t_state_lock); + if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) { + pr_debug("Attempted to abort io tag: %llu already complete or" + " fabric stop, skipping\n", se_cmd->tag); + spin_unlock(&se_cmd->t_state_lock); + return false; + } + se_cmd->transport_state |= CMD_T_ABORTED; + + if ((tmr_sess != se_cmd->se_sess) && tas) + se_cmd->transport_state |= CMD_T_TAS; + + spin_unlock(&se_cmd->t_state_lock); + + return kref_get_unless_zero(&se_cmd->cmd_kref); +} + +void core_tmr_abort_task( + struct se_device *dev, + struct se_tmr_req *tmr, + struct se_session *se_sess) +{ + LIST_HEAD(aborted_list); + struct se_cmd *se_cmd, *next; + unsigned long flags; + bool rc; + u64 ref_tag; + int i; + + for (i = 0; i < dev->queue_cnt; i++) { + flush_work(&dev->queues[i].sq.work); + + spin_lock_irqsave(&dev->queues[i].lock, flags); + list_for_each_entry_safe(se_cmd, next, &dev->queues[i].state_list, + state_list) { + if (se_sess != se_cmd->se_sess) + continue; + + /* + * skip task management functions, including + * tmr->task_cmd + */ + if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) + continue; + + ref_tag = se_cmd->tag; + if (tmr->ref_task_tag != ref_tag) + continue; + + pr_err("ABORT_TASK: Found referenced %s task_tag: %llu\n", + se_cmd->se_tfo->fabric_name, ref_tag); + + spin_lock(&se_sess->sess_cmd_lock); + rc = __target_check_io_state(se_cmd, se_sess, 0); + spin_unlock(&se_sess->sess_cmd_lock); + if (!rc) + continue; + + list_move_tail(&se_cmd->state_list, &aborted_list); + se_cmd->state_active = false; + spin_unlock_irqrestore(&dev->queues[i].lock, flags); + + if (dev->transport->tmr_notify) + dev->transport->tmr_notify(dev, TMR_ABORT_TASK, + &aborted_list); + + list_del_init(&se_cmd->state_list); + target_put_cmd_and_wait(se_cmd); + + pr_err("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for ref_tag: %llu\n", + ref_tag); + tmr->response = TMR_FUNCTION_COMPLETE; + atomic_long_inc(&dev->aborts_complete); + return; + } + spin_unlock_irqrestore(&dev->queues[i].lock, flags); + } + + if (dev->transport->tmr_notify) + dev->transport->tmr_notify(dev, TMR_ABORT_TASK, &aborted_list); + + printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", + tmr->ref_task_tag); + tmr->response = TMR_TASK_DOES_NOT_EXIST; + atomic_long_inc(&dev->aborts_no_task); +} + +static void core_tmr_drain_tmr_list( + struct se_device *dev, + struct se_tmr_req *tmr, + struct list_head *preempt_and_abort_list) +{ + LIST_HEAD(drain_tmr_list); + struct se_session *sess; + struct se_tmr_req *tmr_p, *tmr_pp; + struct se_cmd *cmd; + unsigned long flags; + bool rc; + /* + * Release all pending and outgoing TMRs aside from the received + * LUN_RESET tmr.. + */ + spin_lock_irqsave(&dev->se_tmr_lock, flags); + if (tmr) + list_del_init(&tmr->tmr_list); + list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { + cmd = tmr_p->task_cmd; + if (!cmd) { + pr_err("Unable to locate struct se_cmd for TMR\n"); + continue; + } + /* + * If this function was called with a valid pr_res_key + * parameter (eg: for PROUT PREEMPT_AND_ABORT service action + * skip non registration key matching TMRs. + */ + if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) + continue; + + sess = cmd->se_sess; + if (WARN_ON_ONCE(!sess)) + continue; + + spin_lock(&sess->sess_cmd_lock); + rc = __target_check_io_state(cmd, sess, 0); + spin_unlock(&sess->sess_cmd_lock); + + if (!rc) { + printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); + continue; + } + + list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); + tmr_p->tmr_dev = NULL; + } + spin_unlock_irqrestore(&dev->se_tmr_lock, flags); + + list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { + list_del_init(&tmr_p->tmr_list); + cmd = tmr_p->task_cmd; + + pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," + " Response: 0x%02x, t_state: %d\n", + (preempt_and_abort_list) ? "Preempt" : "", tmr_p, + tmr_p->function, tmr_p->response, cmd->t_state); + + target_put_cmd_and_wait(cmd); + } +} + +/** + * core_tmr_drain_state_list() - abort SCSI commands associated with a device + * + * @dev: Device for which to abort outstanding SCSI commands. + * @prout_cmd: Pointer to the SCSI PREEMPT AND ABORT if this function is called + * to realize the PREEMPT AND ABORT functionality. + * @tmr_sess: Session through which the LUN RESET has been received. + * @tas: Task Aborted Status (TAS) bit from the SCSI control mode page. + * A quote from SPC-4, paragraph "7.5.10 Control mode page": + * "A task aborted status (TAS) bit set to zero specifies that + * aborted commands shall be terminated by the device server + * without any response to the application client. A TAS bit set + * to one specifies that commands aborted by the actions of an I_T + * nexus other than the I_T nexus on which the command was + * received shall be completed with TASK ABORTED status." + * @preempt_and_abort_list: For the PREEMPT AND ABORT functionality, a list + * with registrations that will be preempted. + */ +static void core_tmr_drain_state_list( + struct se_device *dev, + struct se_cmd *prout_cmd, + struct se_session *tmr_sess, + bool tas, + struct list_head *preempt_and_abort_list) +{ + LIST_HEAD(drain_task_list); + struct se_session *sess; + struct se_cmd *cmd, *next; + unsigned long flags; + int rc, i; + + /* + * Complete outstanding commands with TASK_ABORTED SAM status. + * + * This is following sam4r17, section 5.6 Aborting commands, Table 38 + * for TMR LUN_RESET: + * + * a) "Yes" indicates that each command that is aborted on an I_T nexus + * other than the one that caused the SCSI device condition is + * completed with TASK ABORTED status, if the TAS bit is set to one in + * the Control mode page (see SPC-4). "No" indicates that no status is + * returned for aborted commands. + * + * d) If the logical unit reset is caused by a particular I_T nexus + * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" + * (TASK_ABORTED status) applies. + * + * Otherwise (e.g., if triggered by a hard reset), "no" + * (no TASK_ABORTED SAM status) applies. + * + * Note that this seems to be independent of TAS (Task Aborted Status) + * in the Control Mode Page. + */ + for (i = 0; i < dev->queue_cnt; i++) { + flush_work(&dev->queues[i].sq.work); + + spin_lock_irqsave(&dev->queues[i].lock, flags); + list_for_each_entry_safe(cmd, next, &dev->queues[i].state_list, + state_list) { + /* + * For PREEMPT_AND_ABORT usage, only process commands + * with a matching reservation key. + */ + if (target_check_cdb_and_preempt(preempt_and_abort_list, + cmd)) + continue; + + /* + * Not aborting PROUT PREEMPT_AND_ABORT CDB.. + */ + if (prout_cmd == cmd) + continue; + + sess = cmd->se_sess; + if (WARN_ON_ONCE(!sess)) + continue; + + spin_lock(&sess->sess_cmd_lock); + rc = __target_check_io_state(cmd, tmr_sess, tas); + spin_unlock(&sess->sess_cmd_lock); + if (!rc) + continue; + + list_move_tail(&cmd->state_list, &drain_task_list); + cmd->state_active = false; + } + spin_unlock_irqrestore(&dev->queues[i].lock, flags); + } + + if (dev->transport->tmr_notify) + dev->transport->tmr_notify(dev, preempt_and_abort_list ? + TMR_LUN_RESET_PRO : TMR_LUN_RESET, + &drain_task_list); + + while (!list_empty(&drain_task_list)) { + cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); + list_del_init(&cmd->state_list); + + target_show_cmd("LUN_RESET: ", cmd); + pr_debug("LUN_RESET: ITT[0x%08llx] - %s pr_res_key: 0x%016Lx\n", + cmd->tag, (preempt_and_abort_list) ? "preempt" : "", + cmd->pr_res_key); + + target_put_cmd_and_wait(cmd); + } +} + +int core_tmr_lun_reset( + struct se_device *dev, + struct se_tmr_req *tmr, + struct list_head *preempt_and_abort_list, + struct se_cmd *prout_cmd) +{ + struct se_node_acl *tmr_nacl = NULL; + struct se_portal_group *tmr_tpg = NULL; + struct se_session *tmr_sess = NULL; + bool tas; + /* + * TASK_ABORTED status bit, this is configurable via ConfigFS + * struct se_device attributes. spc4r17 section 7.4.6 Control mode page + * + * A task aborted status (TAS) bit set to zero specifies that aborted + * tasks shall be terminated by the device server without any response + * to the application client. A TAS bit set to one specifies that tasks + * aborted by the actions of an I_T nexus other than the I_T nexus on + * which the command was received shall be completed with TASK ABORTED + * status (see SAM-4). + */ + tas = dev->dev_attrib.emulate_tas; + /* + * Determine if this se_tmr is coming from a $FABRIC_MOD + * or struct se_device passthrough.. + */ + if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { + tmr_sess = tmr->task_cmd->se_sess; + tmr_nacl = tmr_sess->se_node_acl; + tmr_tpg = tmr_sess->se_tpg; + if (tmr_nacl && tmr_tpg) { + pr_debug("LUN_RESET: TMR caller fabric: %s" + " initiator port %s\n", + tmr_tpg->se_tpg_tfo->fabric_name, + tmr_nacl->initiatorname); + } + } + pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", + (preempt_and_abort_list) ? "Preempt" : "TMR", + dev->transport->name, tas); + + core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); + core_tmr_drain_state_list(dev, prout_cmd, tmr_sess, tas, + preempt_and_abort_list); + + /* + * Clear any legacy SPC-2 reservation when called during + * LOGICAL UNIT RESET + */ + if (!preempt_and_abort_list && + (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { + spin_lock(&dev->dev_reservation_lock); + dev->reservation_holder = NULL; + dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; + spin_unlock(&dev->dev_reservation_lock); + pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); + } + + atomic_long_inc(&dev->num_resets); + + pr_debug("LUN_RESET: %s for [%s] Complete\n", + (preempt_and_abort_list) ? "Preempt" : "TMR", + dev->transport->name); + return 0; +} + -- cgit v1.2.3