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, 597 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
new file mode 100644
index 000000000..f54f506b0
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -0,0 +1,597 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * zfcp device driver
+ *
+ * Setup and helper functions to access QDIO.
+ *
+ * Copyright IBM Corp. 2002, 2020
+ */
+
+#define KMSG_COMPONENT "zfcp"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/lockdep.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include "zfcp_ext.h"
+#include "zfcp_qdio.h"
+
+static bool enable_multibuffer = true;
+module_param_named(datarouter, enable_multibuffer, bool, 0400);
+MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
+
+#define ZFCP_QDIO_REQUEST_RESCAN_MSECS	(MSEC_PER_SEC * 10)
+#define ZFCP_QDIO_REQUEST_SCAN_MSECS	MSEC_PER_SEC
+
+static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *dbftag,
+				    unsigned int qdio_err)
+{
+	struct zfcp_adapter *adapter = qdio->adapter;
+
+	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
+
+	if (qdio_err & QDIO_ERROR_SLSB_STATE) {
+		zfcp_qdio_siosl(adapter);
+		zfcp_erp_adapter_shutdown(adapter, 0, dbftag);
+		return;
+	}
+	zfcp_erp_adapter_reopen(adapter,
+				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
+				ZFCP_STATUS_COMMON_ERP_FAILED, dbftag);
+}
+
+static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
+{
+	int i, sbal_idx;
+
+	for (i = first; i < first + cnt; i++) {
+		sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
+		memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
+	}
+}
+
+/* this needs to be called prior to updating the queue fill level */
+static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
+{
+	unsigned long long now, span;
+	int used;
+
+	now = get_tod_clock_monotonic();
+	span = (now - qdio->req_q_time) >> 12;
+	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
+	qdio->req_q_util += used * span;
+	qdio->req_q_time = now;
+}
+
+static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
+			      int queue_no, int idx, int count,
+			      unsigned long parm)
+{
+	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
+
+	zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
+}
+
+static void zfcp_qdio_request_tasklet(struct tasklet_struct *tasklet)
+{
+	struct zfcp_qdio *qdio = from_tasklet(qdio, tasklet, request_tasklet);
+	struct ccw_device *cdev = qdio->adapter->ccw_device;
+	unsigned int start, error;
+	int completed;
+
+	completed = qdio_inspect_output_queue(cdev, 0, &start, &error);
+	if (completed > 0) {
+		if (error) {
+			zfcp_qdio_handler_error(qdio, "qdreqt1", error);
+		} else {
+			/* cleanup all SBALs being program-owned now */
+			zfcp_qdio_zero_sbals(qdio->req_q, start, completed);
+
+			spin_lock_irq(&qdio->stat_lock);
+			zfcp_qdio_account(qdio);
+			spin_unlock_irq(&qdio->stat_lock);
+			atomic_add(completed, &qdio->req_q_free);
+			wake_up(&qdio->req_q_wq);
+		}
+	}
+
+	if (atomic_read(&qdio->req_q_free) < QDIO_MAX_BUFFERS_PER_Q)
+		timer_reduce(&qdio->request_timer,
+			     jiffies + msecs_to_jiffies(ZFCP_QDIO_REQUEST_RESCAN_MSECS));
+}
+
+static void zfcp_qdio_request_timer(struct timer_list *timer)
+{
+	struct zfcp_qdio *qdio = from_timer(qdio, timer, request_timer);
+
+	tasklet_schedule(&qdio->request_tasklet);
+}
+
+static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
+			       int queue_no, int idx, int count,
+			       unsigned long parm)
+{
+	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
+	struct zfcp_adapter *adapter = qdio->adapter;
+	int sbal_no, sbal_idx;
+
+	if (unlikely(qdio_err)) {
+		if (zfcp_adapter_multi_buffer_active(adapter)) {
+			void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
+			struct qdio_buffer_element *sbale;
+			u64 req_id;
+			u8 scount;
+
+			memset(pl, 0,
+			       ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
+			sbale = qdio->res_q[idx]->element;
+			req_id = sbale->addr;
+			scount = min(sbale->scount + 1,
+				     ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
+				     /* incl. signaling SBAL */
+
+			for (sbal_no = 0; sbal_no < scount; sbal_no++) {
+				sbal_idx = (idx + sbal_no) %
+					QDIO_MAX_BUFFERS_PER_Q;
+				pl[sbal_no] = qdio->res_q[sbal_idx];
+			}
+			zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
+		}
+		zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
+		return;
+	}
+
+	/*
+	 * go through all SBALs from input queue currently
+	 * returned by QDIO layer
+	 */
+	for (sbal_no = 0; sbal_no < count; sbal_no++) {
+		sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
+		/* go through all SBALEs of SBAL */
+		zfcp_fsf_reqid_check(qdio, sbal_idx);
+	}
+
+	/*
+	 * put SBALs back to response queue
+	 */
+	if (qdio_add_bufs_to_input_queue(cdev, 0, idx, count))
+		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
+}
+
+static void zfcp_qdio_irq_tasklet(struct tasklet_struct *tasklet)
+{
+	struct zfcp_qdio *qdio = from_tasklet(qdio, tasklet, irq_tasklet);
+	struct ccw_device *cdev = qdio->adapter->ccw_device;
+	unsigned int start, error;
+	int completed;
+
+	if (atomic_read(&qdio->req_q_free) < QDIO_MAX_BUFFERS_PER_Q)
+		tasklet_schedule(&qdio->request_tasklet);
+
+	/* Check the Response Queue: */
+	completed = qdio_inspect_input_queue(cdev, 0, &start, &error);
+	if (completed < 0)
+		return;
+	if (completed > 0)
+		zfcp_qdio_int_resp(cdev, error, 0, start, completed,
+				   (unsigned long) qdio);
+
+	if (qdio_start_irq(cdev))
+		/* More work pending: */
+		tasklet_schedule(&qdio->irq_tasklet);
+}
+
+static void zfcp_qdio_poll(struct ccw_device *cdev, unsigned long data)
+{
+	struct zfcp_qdio *qdio = (struct zfcp_qdio *) data;
+
+	tasklet_schedule(&qdio->irq_tasklet);
+}
+
+static struct qdio_buffer_element *
+zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
+{
+	struct qdio_buffer_element *sbale;
+
+	/* set last entry flag in current SBALE of current SBAL */
+	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
+	sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;
+
+	/* don't exceed last allowed SBAL */
+	if (q_req->sbal_last == q_req->sbal_limit)
+		return NULL;
+
+	/* set chaining flag in first SBALE of current SBAL */
+	sbale = zfcp_qdio_sbale_req(qdio, q_req);
+	sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS;
+
+	/* calculate index of next SBAL */
+	q_req->sbal_last++;
+	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
+
+	/* keep this requests number of SBALs up-to-date */
+	q_req->sbal_number++;
+	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
+
+	/* start at first SBALE of new SBAL */
+	q_req->sbale_curr = 0;
+
+	/* set storage-block type for new SBAL */
+	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
+	sbale->sflags |= q_req->sbtype;
+
+	return sbale;
+}
+
+static struct qdio_buffer_element *
+zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
+{
+	if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
+		return zfcp_qdio_sbal_chain(qdio, q_req);
+	q_req->sbale_curr++;
+	return zfcp_qdio_sbale_curr(qdio, q_req);
+}
+
+/**
+ * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
+ * @qdio: pointer to struct zfcp_qdio
+ * @q_req: pointer to struct zfcp_qdio_req
+ * @sg: scatter-gather list
+ * Returns: zero or -EINVAL on error
+ */
+int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
+			    struct scatterlist *sg)
+{
+	struct qdio_buffer_element *sbale;
+
+	/* set storage-block type for this request */
+	sbale = zfcp_qdio_sbale_req(qdio, q_req);
+	sbale->sflags |= q_req->sbtype;
+
+	for (; sg; sg = sg_next(sg)) {
+		sbale = zfcp_qdio_sbale_next(qdio, q_req);
+		if (!sbale) {
+			atomic_inc(&qdio->req_q_full);
+			zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
+					     q_req->sbal_number);
+			return -EINVAL;
+		}
+		sbale->addr = sg_phys(sg);
+		sbale->length = sg->length;
+	}
+	return 0;
+}
+
+static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
+{
+	if (atomic_read(&qdio->req_q_free) ||
+	    !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+		return 1;
+	return 0;
+}
+
+/**
+ * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
+ * @qdio: pointer to struct zfcp_qdio
+ *
+ * The req_q_lock must be held by the caller of this function, and
+ * this function may only be called from process context; it will
+ * sleep when waiting for a free sbal.
+ *
+ * Returns: 0 on success, -EIO if there is no free sbal after waiting.
+ */
+int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
+{
+	long ret;
+
+	ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
+		       zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
+
+	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+		return -EIO;
+
+	if (ret > 0)
+		return 0;
+
+	if (!ret) {
+		atomic_inc(&qdio->req_q_full);
+		/* assume hanging outbound queue, try queue recovery */
+		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
+	}
+
+	return -EIO;
+}
+
+/**
+ * zfcp_qdio_send - send req to QDIO
+ * @qdio: pointer to struct zfcp_qdio
+ * @q_req: pointer to struct zfcp_qdio_req
+ * Returns: 0 on success, error otherwise
+ */
+int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
+{
+	int retval;
+	u8 sbal_number = q_req->sbal_number;
+
+	/*
+	 * This should actually be a spin_lock_bh(stat_lock), to protect against
+	 * Request Queue completion processing in tasklet context.
+	 * But we can't do so (and are safe), as we always get called with IRQs
+	 * disabled by spin_lock_irq[save](req_q_lock).
+	 */
+	lockdep_assert_irqs_disabled();
+	spin_lock(&qdio->stat_lock);
+	zfcp_qdio_account(qdio);
+	spin_unlock(&qdio->stat_lock);
+
+	atomic_sub(sbal_number, &qdio->req_q_free);
+
+	retval = qdio_add_bufs_to_output_queue(qdio->adapter->ccw_device, 0,
+					       q_req->sbal_first, sbal_number,
+					       NULL);
+
+	if (unlikely(retval)) {
+		/* Failed to submit the IO, roll back our modifications. */
+		atomic_add(sbal_number, &qdio->req_q_free);
+		zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
+				     sbal_number);
+		return retval;
+	}
+
+	if (atomic_read(&qdio->req_q_free) <= 2 * ZFCP_QDIO_MAX_SBALS_PER_REQ)
+		tasklet_schedule(&qdio->request_tasklet);
+	else
+		timer_reduce(&qdio->request_timer,
+			     jiffies + msecs_to_jiffies(ZFCP_QDIO_REQUEST_SCAN_MSECS));
+
+	/* account for transferred buffers */
+	qdio->req_q_idx += sbal_number;
+	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
+
+	return 0;
+}
+
+/**
+ * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
+ * @qdio: pointer to struct zfcp_qdio
+ * Returns: -ENOMEM on memory allocation error or return value from
+ *          qdio_allocate
+ */
+static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
+{
+	int ret;
+
+	ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
+	if (ret)
+		return -ENOMEM;
+
+	ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
+	if (ret)
+		goto free_req_q;
+
+	init_waitqueue_head(&qdio->req_q_wq);
+
+	ret = qdio_allocate(qdio->adapter->ccw_device, 1, 1);
+	if (ret)
+		goto free_res_q;
+
+	return 0;
+
+free_res_q:
+	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
+free_req_q:
+	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
+	return ret;
+}
+
+/**
+ * zfcp_qdio_close - close qdio queues for an adapter
+ * @qdio: pointer to structure zfcp_qdio
+ */
+void zfcp_qdio_close(struct zfcp_qdio *qdio)
+{
+	struct zfcp_adapter *adapter = qdio->adapter;
+	int idx, count;
+
+	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+		return;
+
+	/*
+	 * Clear QDIOUP flag, thus qdio_add_bufs_to_output_queue() is not called
+	 * during qdio_shutdown().
+	 */
+	spin_lock_irq(&qdio->req_q_lock);
+	atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
+	spin_unlock_irq(&qdio->req_q_lock);
+
+	wake_up(&qdio->req_q_wq);
+
+	tasklet_disable(&qdio->irq_tasklet);
+	tasklet_disable(&qdio->request_tasklet);
+	del_timer_sync(&qdio->request_timer);
+	qdio_stop_irq(adapter->ccw_device);
+	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
+
+	/* cleanup used outbound sbals */
+	count = atomic_read(&qdio->req_q_free);
+	if (count < QDIO_MAX_BUFFERS_PER_Q) {
+		idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
+		count = QDIO_MAX_BUFFERS_PER_Q - count;
+		zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
+	}
+	qdio->req_q_idx = 0;
+	atomic_set(&qdio->req_q_free, 0);
+}
+
+void zfcp_qdio_shost_update(struct zfcp_adapter *const adapter,
+			    const struct zfcp_qdio *const qdio)
+{
+	struct Scsi_Host *const shost = adapter->scsi_host;
+
+	if (shost == NULL)
+		return;
+
+	shost->sg_tablesize = qdio->max_sbale_per_req;
+	shost->max_sectors = qdio->max_sbale_per_req * 8;
+}
+
+/**
+ * zfcp_qdio_open - prepare and initialize response queue
+ * @qdio: pointer to struct zfcp_qdio
+ * Returns: 0 on success, otherwise -EIO
+ */
+int zfcp_qdio_open(struct zfcp_qdio *qdio)
+{
+	struct qdio_buffer **input_sbals[1] = {qdio->res_q};
+	struct qdio_buffer **output_sbals[1] = {qdio->req_q};
+	struct qdio_buffer_element *sbale;
+	struct qdio_initialize init_data = {0};
+	struct zfcp_adapter *adapter = qdio->adapter;
+	struct ccw_device *cdev = adapter->ccw_device;
+	struct qdio_ssqd_desc ssqd;
+	int cc;
+
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
+		return -EIO;
+
+	atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
+			  &qdio->adapter->status);
+
+	init_data.q_format = QDIO_ZFCP_QFMT;
+	init_data.qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
+	if (enable_multibuffer)
+		init_data.qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
+	init_data.no_input_qs = 1;
+	init_data.no_output_qs = 1;
+	init_data.input_handler = zfcp_qdio_int_resp;
+	init_data.output_handler = zfcp_qdio_int_req;
+	init_data.irq_poll = zfcp_qdio_poll;
+	init_data.int_parm = (unsigned long) qdio;
+	init_data.input_sbal_addr_array = input_sbals;
+	init_data.output_sbal_addr_array = output_sbals;
+
+	if (qdio_establish(cdev, &init_data))
+		goto failed_establish;
+
+	if (qdio_get_ssqd_desc(cdev, &ssqd))
+		goto failed_qdio;
+
+	if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
+		atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
+				&qdio->adapter->status);
+
+	if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
+		atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
+		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
+	} else {
+		atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
+		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
+	}
+
+	qdio->max_sbale_per_req =
+		ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
+		- 2;
+	if (qdio_activate(cdev))
+		goto failed_qdio;
+
+	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
+		sbale = &(qdio->res_q[cc]->element[0]);
+		sbale->length = 0;
+		sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
+		sbale->sflags = 0;
+		sbale->addr = 0;
+	}
+
+	if (qdio_add_bufs_to_input_queue(cdev, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
+		goto failed_qdio;
+
+	/* set index of first available SBALS / number of available SBALS */
+	qdio->req_q_idx = 0;
+	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
+	atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
+
+	/* Enable processing for Request Queue completions: */
+	tasklet_enable(&qdio->request_tasklet);
+	/* Enable processing for QDIO interrupts: */
+	tasklet_enable(&qdio->irq_tasklet);
+	/* This results in a qdio_start_irq(): */
+	tasklet_schedule(&qdio->irq_tasklet);
+
+	zfcp_qdio_shost_update(adapter, qdio);
+
+	return 0;
+
+failed_qdio:
+	qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
+failed_establish:
+	dev_err(&cdev->dev,
+		"Setting up the QDIO connection to the FCP adapter failed\n");
+	return -EIO;
+}
+
+void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
+{
+	if (!qdio)
+		return;
+
+	tasklet_kill(&qdio->irq_tasklet);
+	tasklet_kill(&qdio->request_tasklet);
+
+	if (qdio->adapter->ccw_device)
+		qdio_free(qdio->adapter->ccw_device);
+
+	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
+	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
+	kfree(qdio);
+}
+
+int zfcp_qdio_setup(struct zfcp_adapter *adapter)
+{
+	struct zfcp_qdio *qdio;
+
+	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
+	if (!qdio)
+		return -ENOMEM;
+
+	qdio->adapter = adapter;
+
+	if (zfcp_qdio_allocate(qdio)) {
+		kfree(qdio);
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&qdio->req_q_lock);
+	spin_lock_init(&qdio->stat_lock);
+	timer_setup(&qdio->request_timer, zfcp_qdio_request_timer, 0);
+	tasklet_setup(&qdio->irq_tasklet, zfcp_qdio_irq_tasklet);
+	tasklet_setup(&qdio->request_tasklet, zfcp_qdio_request_tasklet);
+	tasklet_disable(&qdio->irq_tasklet);
+	tasklet_disable(&qdio->request_tasklet);
+
+	adapter->qdio = qdio;
+	return 0;
+}
+
+/**
+ * zfcp_qdio_siosl - Trigger logging in FCP channel
+ * @adapter: The zfcp_adapter where to trigger logging
+ *
+ * Call the cio siosl function to trigger hardware logging.  This
+ * wrapper function sets a flag to ensure hardware logging is only
+ * triggered once before going through qdio shutdown.
+ *
+ * The triggers are always run from qdio tasklet context, so no
+ * additional synchronization is necessary.
+ */
+void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
+{
+	int rc;
+
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
+		return;
+
+	rc = ccw_device_siosl(adapter->ccw_device);
+	if (!rc)
+		atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
+				&adapter->status);
+}