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, 837 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
new file mode 100644
index 000000000..cbc3b62cd
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -0,0 +1,837 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * zfcp device driver
+ *
+ * Debug traces for zfcp.
+ *
+ * Copyright IBM Corp. 2002, 2020
+ */
+
+#define KMSG_COMPONENT "zfcp"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <asm/debug.h>
+#include "zfcp_dbf.h"
+#include "zfcp_ext.h"
+#include "zfcp_fc.h"
+
+static u32 dbfsize = 4;
+
+module_param(dbfsize, uint, 0400);
+MODULE_PARM_DESC(dbfsize,
+		 "number of pages for each debug feature area (default 4)");
+
+static u32 dbflevel = 3;
+
+module_param(dbflevel, uint, 0400);
+MODULE_PARM_DESC(dbflevel,
+		 "log level for each debug feature area "
+		 "(default 3, range 0..6)");
+
+static inline unsigned int zfcp_dbf_plen(unsigned int offset)
+{
+	return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
+}
+
+static inline
+void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
+		       u64 req_id)
+{
+	struct zfcp_dbf_pay *pl = &dbf->pay_buf;
+	u16 offset = 0, rec_length;
+
+	spin_lock(&dbf->pay_lock);
+	memset(pl, 0, sizeof(*pl));
+	pl->fsf_req_id = req_id;
+	memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
+
+	while (offset < length) {
+		rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
+				 (u16) (length - offset));
+		memcpy(pl->data, data + offset, rec_length);
+		debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
+
+		offset += rec_length;
+		pl->counter++;
+	}
+
+	spin_unlock(&dbf->pay_lock);
+}
+
+/**
+ * zfcp_dbf_hba_fsf_res - trace event for fsf responses
+ * @tag: tag indicating which kind of FSF response has been received
+ * @level: trace level to be used for event
+ * @req: request for which a response was received
+ */
+void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
+{
+	struct zfcp_dbf *dbf = req->adapter->dbf;
+	struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
+	struct fsf_qtcb_header *q_head = &req->qtcb->header;
+	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dbf->hba_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_HBA_RES;
+	rec->fsf_req_id = req->req_id;
+	rec->fsf_req_status = req->status;
+	rec->fsf_cmd = q_head->fsf_command;
+	rec->fsf_seq_no = q_pref->req_seq_no;
+	rec->u.res.req_issued = req->issued;
+	rec->u.res.prot_status = q_pref->prot_status;
+	rec->u.res.fsf_status = q_head->fsf_status;
+	rec->u.res.port_handle = q_head->port_handle;
+	rec->u.res.lun_handle = q_head->lun_handle;
+
+	memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
+	       FSF_PROT_STATUS_QUAL_SIZE);
+	memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
+	       FSF_STATUS_QUALIFIER_SIZE);
+
+	rec->pl_len = q_head->log_length;
+	zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
+			  rec->pl_len, "fsf_res", req->req_id);
+
+	debug_event(dbf->hba, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->hba_lock, flags);
+}
+
+/**
+ * zfcp_dbf_hba_fsf_fces - trace event for fsf responses related to
+ *			   FC Endpoint Security (FCES)
+ * @tag: tag indicating which kind of FC Endpoint Security event has occurred
+ * @req: request for which a response was received
+ * @wwpn: remote port or ZFCP_DBF_INVALID_WWPN
+ * @fc_security_old: old FC Endpoint Security of FCP device or connection
+ * @fc_security_new: new FC Endpoint Security of FCP device or connection
+ */
+void zfcp_dbf_hba_fsf_fces(char *tag, const struct zfcp_fsf_req *req, u64 wwpn,
+			   u32 fc_security_old, u32 fc_security_new)
+{
+	struct zfcp_dbf *dbf = req->adapter->dbf;
+	struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
+	struct fsf_qtcb_header *q_head = &req->qtcb->header;
+	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
+	static int const level = 3;
+	unsigned long flags;
+
+	if (unlikely(!debug_level_enabled(dbf->hba, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->hba_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_HBA_FCES;
+	rec->fsf_req_id = req->req_id;
+	rec->fsf_req_status = req->status;
+	rec->fsf_cmd = q_head->fsf_command;
+	rec->fsf_seq_no = q_pref->req_seq_no;
+	rec->u.fces.req_issued = req->issued;
+	rec->u.fces.fsf_status = q_head->fsf_status;
+	rec->u.fces.port_handle = q_head->port_handle;
+	rec->u.fces.wwpn = wwpn;
+	rec->u.fces.fc_security_old = fc_security_old;
+	rec->u.fces.fc_security_new = fc_security_new;
+
+	debug_event(dbf->hba, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->hba_lock, flags);
+}
+
+/**
+ * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
+ * @tag: tag indicating which kind of unsolicited status has been received
+ * @req: request providing the unsolicited status
+ */
+void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
+{
+	struct zfcp_dbf *dbf = req->adapter->dbf;
+	struct fsf_status_read_buffer *srb = req->data;
+	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
+	static int const level = 2;
+	unsigned long flags;
+
+	if (unlikely(!debug_level_enabled(dbf->hba, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->hba_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_HBA_USS;
+	rec->fsf_req_id = req->req_id;
+	rec->fsf_req_status = req->status;
+	rec->fsf_cmd = FSF_QTCB_UNSOLICITED_STATUS;
+
+	if (!srb)
+		goto log;
+
+	rec->u.uss.status_type = srb->status_type;
+	rec->u.uss.status_subtype = srb->status_subtype;
+	rec->u.uss.d_id = ntoh24(srb->d_id);
+	rec->u.uss.lun = srb->fcp_lun;
+	memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
+	       sizeof(rec->u.uss.queue_designator));
+
+	/* status read buffer payload length */
+	rec->pl_len = (!srb->length) ? 0 : srb->length -
+			offsetof(struct fsf_status_read_buffer, payload);
+
+	if (rec->pl_len)
+		zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
+				  "fsf_uss", req->req_id);
+log:
+	debug_event(dbf->hba, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->hba_lock, flags);
+}
+
+/**
+ * zfcp_dbf_hba_bit_err - trace event for bit error conditions
+ * @tag: tag indicating which kind of bit error unsolicited status was received
+ * @req: request which caused the bit_error condition
+ */
+void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
+{
+	struct zfcp_dbf *dbf = req->adapter->dbf;
+	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
+	struct fsf_status_read_buffer *sr_buf = req->data;
+	static int const level = 1;
+	unsigned long flags;
+
+	if (unlikely(!debug_level_enabled(dbf->hba, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->hba_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_HBA_BIT;
+	rec->fsf_req_id = req->req_id;
+	rec->fsf_req_status = req->status;
+	rec->fsf_cmd = FSF_QTCB_UNSOLICITED_STATUS;
+	memcpy(&rec->u.be, &sr_buf->payload.bit_error,
+	       sizeof(struct fsf_bit_error_payload));
+
+	debug_event(dbf->hba, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->hba_lock, flags);
+}
+
+/**
+ * zfcp_dbf_hba_def_err - trace event for deferred error messages
+ * @adapter: pointer to struct zfcp_adapter
+ * @req_id: request id which caused the deferred error message
+ * @scount: number of sbals incl. the signaling sbal
+ * @pl: array of all involved sbals
+ */
+void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
+			  void **pl)
+{
+	struct zfcp_dbf *dbf = adapter->dbf;
+	struct zfcp_dbf_pay *payload = &dbf->pay_buf;
+	unsigned long flags;
+	static int const level = 1;
+	u16 length;
+
+	if (unlikely(!debug_level_enabled(dbf->pay, level)))
+		return;
+
+	if (!pl)
+		return;
+
+	spin_lock_irqsave(&dbf->pay_lock, flags);
+	memset(payload, 0, sizeof(*payload));
+
+	memcpy(payload->area, "def_err", 7);
+	payload->fsf_req_id = req_id;
+	payload->counter = 0;
+	length = min((u16)sizeof(struct qdio_buffer),
+		     (u16)ZFCP_DBF_PAY_MAX_REC);
+
+	while (payload->counter < scount && (char *)pl[payload->counter]) {
+		memcpy(payload->data, (char *)pl[payload->counter], length);
+		debug_event(dbf->pay, level, payload, zfcp_dbf_plen(length));
+		payload->counter++;
+	}
+
+	spin_unlock_irqrestore(&dbf->pay_lock, flags);
+}
+
+static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
+				struct zfcp_adapter *adapter,
+				struct zfcp_port *port,
+				struct scsi_device *sdev)
+{
+	rec->adapter_status = atomic_read(&adapter->status);
+	if (port) {
+		rec->port_status = atomic_read(&port->status);
+		rec->wwpn = port->wwpn;
+		rec->d_id = port->d_id;
+	}
+	if (sdev) {
+		rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
+		rec->lun = zfcp_scsi_dev_lun(sdev);
+	} else
+		rec->lun = ZFCP_DBF_INVALID_LUN;
+}
+
+/**
+ * zfcp_dbf_rec_trig - trace event related to triggered recovery
+ * @tag: identifier for event
+ * @adapter: adapter on which the erp_action should run
+ * @port: remote port involved in the erp_action
+ * @sdev: scsi device involved in the erp_action
+ * @want: wanted erp_action
+ * @need: required erp_action
+ *
+ * The adapter->erp_lock has to be held.
+ */
+void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
+		       struct zfcp_port *port, struct scsi_device *sdev,
+		       u8 want, u8 need)
+{
+	struct zfcp_dbf *dbf = adapter->dbf;
+	struct zfcp_dbf_rec *rec = &dbf->rec_buf;
+	static int const level = 1;
+	struct list_head *entry;
+	unsigned long flags;
+
+	lockdep_assert_held(&adapter->erp_lock);
+
+	if (unlikely(!debug_level_enabled(dbf->rec, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->rec_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	rec->id = ZFCP_DBF_REC_TRIG;
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	zfcp_dbf_set_common(rec, adapter, port, sdev);
+
+	list_for_each(entry, &adapter->erp_ready_head)
+		rec->u.trig.ready++;
+
+	list_for_each(entry, &adapter->erp_running_head)
+		rec->u.trig.running++;
+
+	rec->u.trig.want = want;
+	rec->u.trig.need = need;
+
+	debug_event(dbf->rec, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->rec_lock, flags);
+}
+
+/**
+ * zfcp_dbf_rec_trig_lock - trace event related to triggered recovery with lock
+ * @tag: identifier for event
+ * @adapter: adapter on which the erp_action should run
+ * @port: remote port involved in the erp_action
+ * @sdev: scsi device involved in the erp_action
+ * @want: wanted erp_action
+ * @need: required erp_action
+ *
+ * The adapter->erp_lock must not be held.
+ */
+void zfcp_dbf_rec_trig_lock(char *tag, struct zfcp_adapter *adapter,
+			    struct zfcp_port *port, struct scsi_device *sdev,
+			    u8 want, u8 need)
+{
+	unsigned long flags;
+
+	read_lock_irqsave(&adapter->erp_lock, flags);
+	zfcp_dbf_rec_trig(tag, adapter, port, sdev, want, need);
+	read_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+
+/**
+ * zfcp_dbf_rec_run_lvl - trace event related to running recovery
+ * @level: trace level to be used for event
+ * @tag: identifier for event
+ * @erp: erp_action running
+ */
+void zfcp_dbf_rec_run_lvl(int level, char *tag, struct zfcp_erp_action *erp)
+{
+	struct zfcp_dbf *dbf = erp->adapter->dbf;
+	struct zfcp_dbf_rec *rec = &dbf->rec_buf;
+	unsigned long flags;
+
+	if (!debug_level_enabled(dbf->rec, level))
+		return;
+
+	spin_lock_irqsave(&dbf->rec_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	rec->id = ZFCP_DBF_REC_RUN;
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
+
+	rec->u.run.fsf_req_id = erp->fsf_req_id;
+	rec->u.run.rec_status = erp->status;
+	rec->u.run.rec_step = erp->step;
+	rec->u.run.rec_action = erp->type;
+
+	if (erp->sdev)
+		rec->u.run.rec_count =
+			atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
+	else if (erp->port)
+		rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
+	else
+		rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
+
+	debug_event(dbf->rec, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->rec_lock, flags);
+}
+
+/**
+ * zfcp_dbf_rec_run - trace event related to running recovery
+ * @tag: identifier for event
+ * @erp: erp_action running
+ */
+void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
+{
+	zfcp_dbf_rec_run_lvl(1, tag, erp);
+}
+
+/**
+ * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
+ * @tag: identifier for event
+ * @wka_port: well known address port
+ * @req_id: request ID to correlate with potential HBA trace record
+ */
+void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
+			  u64 req_id)
+{
+	struct zfcp_dbf *dbf = wka_port->adapter->dbf;
+	struct zfcp_dbf_rec *rec = &dbf->rec_buf;
+	static int const level = 1;
+	unsigned long flags;
+
+	if (unlikely(!debug_level_enabled(dbf->rec, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->rec_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	rec->id = ZFCP_DBF_REC_RUN;
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->port_status = wka_port->status;
+	rec->d_id = wka_port->d_id;
+	rec->lun = ZFCP_DBF_INVALID_LUN;
+
+	rec->u.run.fsf_req_id = req_id;
+	rec->u.run.rec_status = ~0;
+	rec->u.run.rec_step = ~0;
+	rec->u.run.rec_action = ~0;
+	rec->u.run.rec_count = ~0;
+
+	debug_event(dbf->rec, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->rec_lock, flags);
+}
+
+#define ZFCP_DBF_SAN_LEVEL 1
+
+static inline
+void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf,
+		  char *paytag, struct scatterlist *sg, u8 id, u16 len,
+		  u64 req_id, u32 d_id, u16 cap_len)
+{
+	struct zfcp_dbf_san *rec = &dbf->san_buf;
+	u16 rec_len;
+	unsigned long flags;
+	struct zfcp_dbf_pay *payload = &dbf->pay_buf;
+	u16 pay_sum = 0;
+
+	spin_lock_irqsave(&dbf->san_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	rec->id = id;
+	rec->fsf_req_id = req_id;
+	rec->d_id = d_id;
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->pl_len = len; /* full length even if we cap pay below */
+	if (!sg)
+		goto out;
+	rec_len = min_t(unsigned int, sg->length, ZFCP_DBF_SAN_MAX_PAYLOAD);
+	memcpy(rec->payload, sg_virt(sg), rec_len); /* part of 1st sg entry */
+	if (len <= rec_len)
+		goto out; /* skip pay record if full content in rec->payload */
+
+	/* if (len > rec_len):
+	 * dump data up to cap_len ignoring small duplicate in rec->payload
+	 */
+	spin_lock(&dbf->pay_lock);
+	memset(payload, 0, sizeof(*payload));
+	memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN);
+	payload->fsf_req_id = req_id;
+	payload->counter = 0;
+	for (; sg && pay_sum < cap_len; sg = sg_next(sg)) {
+		u16 pay_len, offset = 0;
+
+		while (offset < sg->length && pay_sum < cap_len) {
+			pay_len = min((u16)ZFCP_DBF_PAY_MAX_REC,
+				      (u16)(sg->length - offset));
+			/* cap_len <= pay_sum < cap_len+ZFCP_DBF_PAY_MAX_REC */
+			memcpy(payload->data, sg_virt(sg) + offset, pay_len);
+			debug_event(dbf->pay, ZFCP_DBF_SAN_LEVEL, payload,
+				    zfcp_dbf_plen(pay_len));
+			payload->counter++;
+			offset += pay_len;
+			pay_sum += pay_len;
+		}
+	}
+	spin_unlock(&dbf->pay_lock);
+
+out:
+	debug_event(dbf->san, ZFCP_DBF_SAN_LEVEL, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->san_lock, flags);
+}
+
+/**
+ * zfcp_dbf_san_req - trace event for issued SAN request
+ * @tag: identifier for event
+ * @fsf: request containing issued CT or ELS data
+ * @d_id: N_Port_ID where SAN request is sent to
+ * d_id: destination ID
+ */
+void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
+{
+	struct zfcp_dbf *dbf = fsf->adapter->dbf;
+	struct zfcp_fsf_ct_els *ct_els = fsf->data;
+	u16 length;
+
+	if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL)))
+		return;
+
+	length = (u16)zfcp_qdio_real_bytes(ct_els->req);
+	zfcp_dbf_san(tag, dbf, "san_req", ct_els->req, ZFCP_DBF_SAN_REQ,
+		     length, fsf->req_id, d_id, length);
+}
+
+static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag,
+					      struct zfcp_fsf_req *fsf,
+					      u16 len)
+{
+	struct zfcp_fsf_ct_els *ct_els = fsf->data;
+	struct fc_ct_hdr *reqh = sg_virt(ct_els->req);
+	struct fc_ns_gid_ft *reqn = (struct fc_ns_gid_ft *)(reqh + 1);
+	struct scatterlist *resp_entry = ct_els->resp;
+	struct fc_ct_hdr *resph;
+	struct fc_gpn_ft_resp *acc;
+	int max_entries, x, last = 0;
+
+	if (!(memcmp(tag, "fsscth2", 7) == 0
+	      && ct_els->d_id == FC_FID_DIR_SERV
+	      && reqh->ct_rev == FC_CT_REV
+	      && reqh->ct_in_id[0] == 0
+	      && reqh->ct_in_id[1] == 0
+	      && reqh->ct_in_id[2] == 0
+	      && reqh->ct_fs_type == FC_FST_DIR
+	      && reqh->ct_fs_subtype == FC_NS_SUBTYPE
+	      && reqh->ct_options == 0
+	      && reqh->_ct_resvd1 == 0
+	      && reqh->ct_cmd == cpu_to_be16(FC_NS_GPN_FT)
+	      /* reqh->ct_mr_size can vary so do not match but read below */
+	      && reqh->_ct_resvd2 == 0
+	      && reqh->ct_reason == 0
+	      && reqh->ct_explan == 0
+	      && reqh->ct_vendor == 0
+	      && reqn->fn_resvd == 0
+	      && reqn->fn_domain_id_scope == 0
+	      && reqn->fn_area_id_scope == 0
+	      && reqn->fn_fc4_type == FC_TYPE_FCP))
+		return len; /* not GPN_FT response so do not cap */
+
+	acc = sg_virt(resp_entry);
+
+	/* cap all but accept CT responses to at least the CT header */
+	resph = (struct fc_ct_hdr *)acc;
+	if ((ct_els->status) ||
+	    (resph->ct_cmd != cpu_to_be16(FC_FS_ACC)))
+		return max(FC_CT_HDR_LEN, ZFCP_DBF_SAN_MAX_PAYLOAD);
+
+	max_entries = (be16_to_cpu(reqh->ct_mr_size) * 4 /
+		       sizeof(struct fc_gpn_ft_resp))
+		+ 1 /* zfcp_fc_scan_ports: bytes correct, entries off-by-one
+		     * to account for header as 1st pseudo "entry" */;
+
+	/* the basic CT_IU preamble is the same size as one entry in the GPN_FT
+	 * response, allowing us to skip special handling for it - just skip it
+	 */
+	for (x = 1; x < max_entries && !last; x++) {
+		if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
+			acc++;
+		else
+			acc = sg_virt(++resp_entry);
+
+		last = acc->fp_flags & FC_NS_FID_LAST;
+	}
+	len = min(len, (u16)(x * sizeof(struct fc_gpn_ft_resp)));
+	return len; /* cap after last entry */
+}
+
+/**
+ * zfcp_dbf_san_res - trace event for received SAN request
+ * @tag: identifier for event
+ * @fsf: request containing received CT or ELS data
+ */
+void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
+{
+	struct zfcp_dbf *dbf = fsf->adapter->dbf;
+	struct zfcp_fsf_ct_els *ct_els = fsf->data;
+	u16 length;
+
+	if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL)))
+		return;
+
+	length = (u16)zfcp_qdio_real_bytes(ct_els->resp);
+	zfcp_dbf_san(tag, dbf, "san_res", ct_els->resp, ZFCP_DBF_SAN_RES,
+		     length, fsf->req_id, ct_els->d_id,
+		     zfcp_dbf_san_res_cap_len_if_gpn_ft(tag, fsf, length));
+}
+
+/**
+ * zfcp_dbf_san_in_els - trace event for incoming ELS
+ * @tag: identifier for event
+ * @fsf: request containing received ELS data
+ */
+void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
+{
+	struct zfcp_dbf *dbf = fsf->adapter->dbf;
+	struct fsf_status_read_buffer *srb =
+		(struct fsf_status_read_buffer *) fsf->data;
+	u16 length;
+	struct scatterlist sg;
+
+	if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL)))
+		return;
+
+	length = (u16)(srb->length -
+			offsetof(struct fsf_status_read_buffer, payload));
+	sg_init_one(&sg, srb->payload.data, length);
+	zfcp_dbf_san(tag, dbf, "san_els", &sg, ZFCP_DBF_SAN_ELS, length,
+		     fsf->req_id, ntoh24(srb->d_id), length);
+}
+
+/**
+ * zfcp_dbf_scsi_common() - Common trace event helper for scsi.
+ * @tag: Identifier for event.
+ * @level: trace level of event.
+ * @sdev: Pointer to SCSI device as context for this event.
+ * @sc: Pointer to SCSI command, or NULL with task management function (TMF).
+ * @fsf: Pointer to FSF request, or NULL.
+ */
+void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
+			  struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
+{
+	struct zfcp_adapter *adapter =
+		(struct zfcp_adapter *) sdev->host->hostdata[0];
+	struct zfcp_dbf *dbf = adapter->dbf;
+	struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
+	struct fcp_resp_with_ext *fcp_rsp;
+	struct fcp_resp_rsp_info *fcp_rsp_info;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dbf->scsi_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_SCSI_CMND;
+	if (sc) {
+		rec->scsi_result = sc->result;
+		rec->scsi_retries = sc->retries;
+		rec->scsi_allowed = sc->allowed;
+		rec->scsi_id = sc->device->id;
+		rec->scsi_lun = (u32)sc->device->lun;
+		rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
+		rec->host_scribble = (unsigned long)sc->host_scribble;
+
+		memcpy(rec->scsi_opcode, sc->cmnd,
+		       min_t(int, sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
+	} else {
+		rec->scsi_result = ~0;
+		rec->scsi_retries = ~0;
+		rec->scsi_allowed = ~0;
+		rec->scsi_id = sdev->id;
+		rec->scsi_lun = (u32)sdev->lun;
+		rec->scsi_lun_64_hi = (u32)(sdev->lun >> 32);
+		rec->host_scribble = ~0;
+
+		memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE);
+	}
+
+	if (fsf) {
+		rec->fsf_req_id = fsf->req_id;
+		rec->pl_len = FCP_RESP_WITH_EXT;
+		fcp_rsp = &(fsf->qtcb->bottom.io.fcp_rsp.iu);
+		/* mandatory parts of FCP_RSP IU in this SCSI record */
+		memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
+		if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
+			fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
+			rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
+			rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
+		}
+		if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
+			rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_sns_len);
+		}
+		/* complete FCP_RSP IU in associated PAYload record
+		 * but only if there are optional parts
+		 */
+		if (fcp_rsp->resp.fr_flags != 0)
+			zfcp_dbf_pl_write(
+				dbf, fcp_rsp,
+				/* at least one full PAY record
+				 * but not beyond hardware response field
+				 */
+				min_t(u16, max_t(u16, rec->pl_len,
+						 ZFCP_DBF_PAY_MAX_REC),
+				      FSF_FCP_RSP_SIZE),
+				"fcp_riu", fsf->req_id);
+	}
+
+	debug_event(dbf->scsi, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->scsi_lock, flags);
+}
+
+/**
+ * zfcp_dbf_scsi_eh() - Trace event for special cases of scsi_eh callbacks.
+ * @tag: Identifier for event.
+ * @adapter: Pointer to zfcp adapter as context for this event.
+ * @scsi_id: SCSI ID/target to indicate scope of task management function (TMF).
+ * @ret: Return value of calling function.
+ *
+ * This SCSI trace variant does not depend on any of:
+ * scsi_cmnd, zfcp_fsf_req, scsi_device.
+ */
+void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter,
+		      unsigned int scsi_id, int ret)
+{
+	struct zfcp_dbf *dbf = adapter->dbf;
+	struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
+	unsigned long flags;
+	static int const level = 1;
+
+	if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->scsi_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_SCSI_CMND;
+	rec->scsi_result = ret; /* re-use field, int is 4 bytes and fits */
+	rec->scsi_retries = ~0;
+	rec->scsi_allowed = ~0;
+	rec->fcp_rsp_info = ~0;
+	rec->scsi_id = scsi_id;
+	rec->scsi_lun = (u32)ZFCP_DBF_INVALID_LUN;
+	rec->scsi_lun_64_hi = (u32)(ZFCP_DBF_INVALID_LUN >> 32);
+	rec->host_scribble = ~0;
+	memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE);
+
+	debug_event(dbf->scsi, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->scsi_lock, flags);
+}
+
+static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
+{
+	struct debug_info *d;
+
+	d = debug_register(name, size, 1, rec_size);
+	if (!d)
+		return NULL;
+
+	debug_register_view(d, &debug_hex_ascii_view);
+	debug_set_level(d, dbflevel);
+
+	return d;
+}
+
+static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
+{
+	if (!dbf)
+		return;
+
+	debug_unregister(dbf->scsi);
+	debug_unregister(dbf->san);
+	debug_unregister(dbf->hba);
+	debug_unregister(dbf->pay);
+	debug_unregister(dbf->rec);
+	kfree(dbf);
+}
+
+/**
+ * zfcp_dbf_adapter_register - registers debug feature for an adapter
+ * @adapter: pointer to adapter for which debug features should be registered
+ * return: -ENOMEM on error, 0 otherwise
+ */
+int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
+{
+	char name[DEBUG_MAX_NAME_LEN];
+	struct zfcp_dbf *dbf;
+
+	dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
+	if (!dbf)
+		return -ENOMEM;
+
+	spin_lock_init(&dbf->pay_lock);
+	spin_lock_init(&dbf->hba_lock);
+	spin_lock_init(&dbf->san_lock);
+	spin_lock_init(&dbf->scsi_lock);
+	spin_lock_init(&dbf->rec_lock);
+
+	/* debug feature area which records recovery activity */
+	sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
+	dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
+	if (!dbf->rec)
+		goto err_out;
+
+	/* debug feature area which records HBA (FSF and QDIO) conditions */
+	sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
+	dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
+	if (!dbf->hba)
+		goto err_out;
+
+	/* debug feature area which records payload info */
+	sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
+	dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
+	if (!dbf->pay)
+		goto err_out;
+
+	/* debug feature area which records SAN command failures and recovery */
+	sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
+	dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
+	if (!dbf->san)
+		goto err_out;
+
+	/* debug feature area which records SCSI command failures and recovery */
+	sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
+	dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
+	if (!dbf->scsi)
+		goto err_out;
+
+	adapter->dbf = dbf;
+
+	return 0;
+err_out:
+	zfcp_dbf_unregister(dbf);
+	return -ENOMEM;
+}
+
+/**
+ * zfcp_dbf_adapter_unregister - unregisters debug feature for an adapter
+ * @adapter: pointer to adapter for which debug features should be unregistered
+ */
+void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
+{
+	struct zfcp_dbf *dbf = adapter->dbf;
+
+	adapter->dbf = NULL;
+	zfcp_dbf_unregister(dbf);
+}
+