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, 353 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
new file mode 100644
index 000000000..94de55304
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -0,0 +1,353 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * zfcp device driver
+ *
+ * Global definitions for the zfcp device driver.
+ *
+ * Copyright IBM Corp. 2002, 2020
+ */
+
+#ifndef ZFCP_DEF_H
+#define ZFCP_DEF_H
+
+/*************************** INCLUDES *****************************************/
+
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/major.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/mempool.h>
+#include <linux/syscalls.h>
+#include <linux/scatterlist.h>
+#include <linux/ioctl.h>
+#include <scsi/fc/fc_fs.h>
+#include <scsi/fc/fc_gs.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
+#include <scsi/scsi_bsg_fc.h>
+#include <asm/ccwdev.h>
+#include <asm/debug.h>
+#include <asm/ebcdic.h>
+#include <asm/sysinfo.h>
+#include "zfcp_fsf.h"
+#include "zfcp_fc.h"
+#include "zfcp_qdio.h"
+
+/********************* FSF SPECIFIC DEFINES *********************************/
+
+/* ATTENTION: value must not be used by hardware */
+#define FSF_QTCB_UNSOLICITED_STATUS		0x6305
+
+/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
+
+/*
+ * Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
+ * and unit. This is a mask for bitwise 'and' with status values.
+ */
+#define ZFCP_COMMON_FLAGS			0xfff00000
+
+/* common status bits */
+#define ZFCP_STATUS_COMMON_RUNNING		0x40000000
+#define ZFCP_STATUS_COMMON_ERP_FAILED		0x20000000
+#define ZFCP_STATUS_COMMON_UNBLOCKED		0x10000000
+#define ZFCP_STATUS_COMMON_OPEN                 0x04000000
+#define ZFCP_STATUS_COMMON_ERP_INUSE		0x01000000
+#define ZFCP_STATUS_COMMON_ACCESS_DENIED	0x00800000
+#define ZFCP_STATUS_COMMON_ACCESS_BOXED		0x00400000
+#define ZFCP_STATUS_COMMON_NOESC		0x00200000
+
+/* adapter status */
+#define ZFCP_STATUS_ADAPTER_MB_ACT		0x00000001
+#define ZFCP_STATUS_ADAPTER_QDIOUP		0x00000002
+#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED	0x00000004
+#define ZFCP_STATUS_ADAPTER_XCONFIG_OK		0x00000008
+#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT	0x00000010
+#define ZFCP_STATUS_ADAPTER_ERP_PENDING		0x00000100
+#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED	0x00000200
+#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED	0x00000400
+
+/* remote port status */
+#define ZFCP_STATUS_PORT_PHYS_OPEN		0x00000001
+#define ZFCP_STATUS_PORT_LINK_TEST		0x00000002
+
+/* FSF request status (this does not have a common part) */
+#define ZFCP_STATUS_FSFREQ_ERROR		0x00000008
+#define ZFCP_STATUS_FSFREQ_CLEANUP		0x00000010
+#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED	0x00000040
+#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
+#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
+#define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
+#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE	0x00020000
+
+/************************* STRUCTURE DEFINITIONS *****************************/
+
+/**
+ * enum zfcp_erp_act_type - Type of ERP action object.
+ * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
+ * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
+ * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
+ * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
+ *
+ * Values must fit into u8 because of code dependencies:
+ * zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
+ * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
+ */
+enum zfcp_erp_act_type {
+	ZFCP_ERP_ACTION_REOPEN_LUN	   = 1,
+	ZFCP_ERP_ACTION_REOPEN_PORT	   = 2,
+	ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
+	ZFCP_ERP_ACTION_REOPEN_ADAPTER	   = 4,
+};
+
+/*
+ * Values must fit into u16 because of code dependencies:
+ * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
+ * &zfcp_dbf_rec_running.rec_step.
+ */
+enum zfcp_erp_steps {
+	ZFCP_ERP_STEP_UNINITIALIZED	= 0x0000,
+	ZFCP_ERP_STEP_PHYS_PORT_CLOSING	= 0x0010,
+	ZFCP_ERP_STEP_PORT_CLOSING	= 0x0100,
+	ZFCP_ERP_STEP_PORT_OPENING	= 0x0800,
+	ZFCP_ERP_STEP_LUN_CLOSING	= 0x1000,
+	ZFCP_ERP_STEP_LUN_OPENING	= 0x2000,
+};
+
+struct zfcp_erp_action {
+	struct list_head list;
+	enum zfcp_erp_act_type type;  /* requested action code */
+	struct zfcp_adapter *adapter; /* device which should be recovered */
+	struct zfcp_port *port;
+	struct scsi_device *sdev;
+	u32		status;	      /* recovery status */
+	enum zfcp_erp_steps	step;	/* active step of this erp action */
+	unsigned long		fsf_req_id;
+	struct timer_list timer;
+};
+
+/* holds various memory pools of an adapter */
+struct zfcp_adapter_mempool {
+	mempool_t *erp_req;
+	mempool_t *gid_pn_req;
+	mempool_t *scsi_req;
+	mempool_t *scsi_abort;
+	mempool_t *status_read_req;
+	mempool_t *sr_data;
+	mempool_t *gid_pn;
+	mempool_t *qtcb_pool;
+};
+
+struct zfcp_adapter {
+	struct kref		ref;
+	u64			peer_wwnn;	   /* P2P peer WWNN */
+	u64			peer_wwpn;	   /* P2P peer WWPN */
+	u32			peer_d_id;	   /* P2P peer D_ID */
+	struct ccw_device       *ccw_device;	   /* S/390 ccw device */
+	struct zfcp_qdio	*qdio;
+	u32			hydra_version;	   /* Hydra version */
+	u32			fsf_lic_version;
+	u32			adapter_features;  /* FCP channel features */
+	u32			connection_features; /* host connection features */
+	u32			hardware_version;  /* of FCP channel */
+	u32			fc_security_algorithms; /* of FCP channel */
+	u32			fc_security_algorithms_old; /* of FCP channel */
+	u16			timer_ticks;       /* time int for a tick */
+	struct Scsi_Host	*scsi_host;	   /* Pointer to mid-layer */
+	struct list_head	port_list;	   /* remote port list */
+	rwlock_t		port_list_lock;    /* port list lock */
+	unsigned long		req_no;		   /* unique FSF req number */
+	struct zfcp_reqlist	*req_list;
+	u32			fsf_req_seq_no;	   /* FSF cmnd seq number */
+	rwlock_t		abort_lock;        /* Protects against SCSI
+						      stack abort/command
+						      completion races */
+	atomic_t		stat_miss;	   /* # missing status reads*/
+	unsigned int		stat_read_buf_num;
+	struct work_struct	stat_work;
+	atomic_t		status;	           /* status of this adapter */
+	struct list_head	erp_ready_head;	   /* error recovery for this
+						      adapter/devices */
+	wait_queue_head_t	erp_ready_wq;
+	struct list_head	erp_running_head;
+	rwlock_t		erp_lock;
+	wait_queue_head_t	erp_done_wqh;
+	struct zfcp_erp_action	erp_action;	   /* pending error recovery */
+	atomic_t		erp_counter;
+	u32			erp_total_count;   /* total nr of enqueued erp
+						      actions */
+	u32			erp_low_mem_count; /* nr of erp actions waiting
+						      for memory */
+	struct task_struct	*erp_thread;
+	struct zfcp_fc_wka_ports *gs;		   /* generic services */
+	struct zfcp_dbf		*dbf;		   /* debug traces */
+	struct zfcp_adapter_mempool	pool;      /* Adapter memory pools */
+	struct fc_host_statistics *fc_stats;
+	struct fsf_qtcb_bottom_port *stats_reset_data;
+	unsigned long		stats_reset;
+	struct delayed_work	scan_work;
+	struct work_struct	ns_up_work;
+	struct service_level	service_level;
+	struct workqueue_struct	*work_queue;
+	struct device_dma_parameters dma_parms;
+	struct zfcp_fc_events events;
+	unsigned long		next_port_scan;
+	struct zfcp_diag_adapter	*diagnostics;
+	struct work_struct	version_change_lost_work;
+};
+
+struct zfcp_port {
+	struct device          dev;
+	struct fc_rport        *rport;         /* rport of fc transport class */
+	struct list_head       list;	       /* list of remote ports */
+	struct zfcp_adapter    *adapter;       /* adapter used to access port */
+	struct list_head	unit_list;	/* head of logical unit list */
+	rwlock_t		unit_list_lock; /* unit list lock */
+	atomic_t		units;	       /* zfcp_unit count */
+	atomic_t	       status;	       /* status of this remote port */
+	u64		       wwnn;	       /* WWNN if known */
+	u64		       wwpn;	       /* WWPN */
+	u32		       d_id;	       /* D_ID */
+	u32		       handle;	       /* handle assigned by FSF */
+	struct zfcp_erp_action erp_action;     /* pending error recovery */
+	atomic_t	       erp_counter;
+	u32                    maxframe_size;
+	u32                    supported_classes;
+	u32                    connection_info;
+	u32                    connection_info_old;
+	struct work_struct     gid_pn_work;
+	struct work_struct     test_link_work;
+	struct work_struct     rport_work;
+	enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
+	unsigned int		starget_id;
+};
+
+struct zfcp_latency_record {
+	u32 min;
+	u32 max;
+	u64 sum;
+};
+
+struct zfcp_latency_cont {
+	struct zfcp_latency_record channel;
+	struct zfcp_latency_record fabric;
+	u64 counter;
+};
+
+struct zfcp_latencies {
+	struct zfcp_latency_cont read;
+	struct zfcp_latency_cont write;
+	struct zfcp_latency_cont cmd;
+	spinlock_t lock;
+};
+
+/**
+ * struct zfcp_unit - LUN configured via zfcp sysfs
+ * @dev: struct device for sysfs representation and reference counting
+ * @list: entry in LUN/unit list per zfcp_port
+ * @port: reference to zfcp_port where this LUN is configured
+ * @fcp_lun: 64 bit LUN value
+ * @scsi_work: for running scsi_scan_target
+ *
+ * This is the representation of a LUN that has been configured for
+ * usage. The main data here is the 64 bit LUN value, data for
+ * running I/O and recovery is in struct zfcp_scsi_dev.
+ */
+struct zfcp_unit {
+	struct device		dev;
+	struct list_head	list;
+	struct zfcp_port	*port;
+	u64			fcp_lun;
+	struct work_struct	scsi_work;
+};
+
+/**
+ * struct zfcp_scsi_dev - zfcp data per SCSI device
+ * @status: zfcp internal status flags
+ * @lun_handle: handle from "open lun" for issuing FSF requests
+ * @erp_action: zfcp erp data for opening and recovering this LUN
+ * @erp_counter: zfcp erp counter for this LUN
+ * @latencies: FSF channel and fabric latencies
+ * @port: zfcp_port where this LUN belongs to
+ */
+struct zfcp_scsi_dev {
+	atomic_t		status;
+	u32			lun_handle;
+	struct zfcp_erp_action	erp_action;
+	atomic_t		erp_counter;
+	struct zfcp_latencies	latencies;
+	struct zfcp_port	*port;
+};
+
+/**
+ * sdev_to_zfcp - Access zfcp LUN data for SCSI device
+ * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
+ */
+static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
+{
+	return scsi_transport_device_data(sdev);
+}
+
+/**
+ * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
+ * @sdev: SCSI device where to get the LUN from
+ */
+static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
+{
+	u64 fcp_lun;
+
+	int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
+	return fcp_lun;
+}
+
+/**
+ * struct zfcp_fsf_req - basic FSF request structure
+ * @list: list of FSF requests
+ * @req_id: unique request ID
+ * @adapter: adapter this request belongs to
+ * @qdio_req: qdio queue related values
+ * @completion: used to signal the completion of the request
+ * @status: status of the request
+ * @qtcb: associated QTCB
+ * @data: private data
+ * @timer: timer data of this request
+ * @erp_action: reference to erp action if request issued on behalf of ERP
+ * @pool: reference to memory pool if used for this request
+ * @issued: time when request was send (STCK)
+ * @handler: handler which should be called to process response
+ */
+struct zfcp_fsf_req {
+	struct list_head	list;
+	unsigned long		req_id;
+	struct zfcp_adapter	*adapter;
+	struct zfcp_qdio_req	qdio_req;
+	struct completion	completion;
+	u32			status;
+	struct fsf_qtcb		*qtcb;
+	void			*data;
+	struct timer_list	timer;
+	struct zfcp_erp_action	*erp_action;
+	mempool_t		*pool;
+	unsigned long long	issued;
+	void			(*handler)(struct zfcp_fsf_req *);
+};
+
+static inline
+int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
+{
+	return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
+}
+
+static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
+{
+	return req->qtcb == NULL;
+}
+
+#endif /* ZFCP_DEF_H */