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, 576 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
new file mode 100644
index 000000000..dee8c97ff
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -0,0 +1,576 @@
+/*
+ * iSER transport for the Open iSCSI Initiator & iSER transport internals
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * based on code maintained by open-iscsi@googlegroups.com
+ *
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *	- Redistributions of source code must retain the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer.
+ *
+ *	- Redistributions in binary form must reproduce the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer in the documentation and/or other materials
+ *	  provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ISCSI_ISER_H__
+#define __ISCSI_ISER_H__
+
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/printk.h>
+#include <scsi/libiscsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/iser.h>
+
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/mutex.h>
+#include <linux/mempool.h>
+#include <linux/uio.h>
+
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+
+#define DRV_NAME	"iser"
+#define PFX		DRV_NAME ": "
+#define DRV_VER		"1.6"
+
+#define iser_dbg(fmt, arg...)				 \
+	do {						 \
+		if (unlikely(iser_debug_level > 2))	 \
+			printk(KERN_DEBUG PFX "%s: " fmt,\
+				__func__ , ## arg);	 \
+	} while (0)
+
+#define iser_warn(fmt, arg...)				\
+	do {						\
+		if (unlikely(iser_debug_level > 0))	\
+			pr_warn(PFX "%s: " fmt,		\
+				__func__ , ## arg);	\
+	} while (0)
+
+#define iser_info(fmt, arg...)				\
+	do {						\
+		if (unlikely(iser_debug_level > 1))	\
+			pr_info(PFX "%s: " fmt,		\
+				__func__ , ## arg);	\
+	} while (0)
+
+#define iser_err(fmt, arg...) \
+	pr_err(PFX "%s: " fmt, __func__ , ## arg)
+
+/* Default support is 512KB I/O size */
+#define ISER_DEF_MAX_SECTORS		1024
+#define ISCSI_ISER_DEF_SG_TABLESIZE                                            \
+	((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K))
+/* Maximum support is 16MB I/O size */
+#define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K))
+
+#define ISER_DEF_XMIT_CMDS_DEFAULT		512
+#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
+	#define ISER_DEF_XMIT_CMDS_MAX		ISCSI_DEF_XMIT_CMDS_MAX
+#else
+	#define ISER_DEF_XMIT_CMDS_MAX		ISER_DEF_XMIT_CMDS_DEFAULT
+#endif
+#define ISER_DEF_CMD_PER_LUN		ISER_DEF_XMIT_CMDS_MAX
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISER_MAX_RX_MISC_PDUS		4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
+
+#define ISER_MAX_TX_MISC_PDUS		6 /* NOOP_OUT(2), TEXT(1),         *
+					   * SCSI_TMFUNC(2), LOGOUT(1) */
+
+#define ISER_QP_MAX_RECV_DTOS		(ISER_DEF_XMIT_CMDS_MAX)
+
+/* the max TX (send) WR supported by the iSER QP is defined by                 *
+ * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
+ * to have at max for SCSI command. The tx posting & completion handling code  *
+ * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
+ * send WR. D=8 comes from 64K/8K                                              */
+
+#define ISER_INFLIGHT_DATAOUTS		8
+
+#define ISER_QP_MAX_REQ_DTOS		(ISER_DEF_XMIT_CMDS_MAX *    \
+					(1 + ISER_INFLIGHT_DATAOUTS) + \
+					ISER_MAX_TX_MISC_PDUS        + \
+					ISER_MAX_RX_MISC_PDUS)
+
+/* Max registration work requests per command */
+#define ISER_MAX_REG_WR_PER_CMD		5
+
+/* For Signature we don't support DATAOUTs so no need to make room for them */
+#define ISER_QP_SIG_MAX_REQ_DTOS	(ISER_DEF_XMIT_CMDS_MAX	*       \
+					(1 + ISER_MAX_REG_WR_PER_CMD) + \
+					ISER_MAX_TX_MISC_PDUS         + \
+					ISER_MAX_RX_MISC_PDUS)
+
+#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr			\
+					 - ISER_MAX_TX_MISC_PDUS	\
+					 - ISER_MAX_RX_MISC_PDUS) /	\
+					 (1 + ISER_INFLIGHT_DATAOUTS))
+
+/* Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN	(sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
+
+#define ISER_RECV_DATA_SEG_LEN	128
+#define ISER_RX_PAYLOAD_SIZE	(ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
+#define ISER_RX_LOGIN_SIZE	(ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
+
+/* Length of an object name string */
+#define ISER_OBJECT_NAME_SIZE		    64
+
+enum iser_conn_state {
+	ISER_CONN_INIT,		   /* descriptor allocd, no conn          */
+	ISER_CONN_PENDING,	   /* in the process of being established */
+	ISER_CONN_UP,		   /* up and running                      */
+	ISER_CONN_TERMINATING,	   /* in the process of being terminated  */
+	ISER_CONN_DOWN,		   /* shut down                           */
+	ISER_CONN_STATES_NUM
+};
+
+enum iser_task_status {
+	ISER_TASK_STATUS_INIT = 0,
+	ISER_TASK_STATUS_STARTED,
+	ISER_TASK_STATUS_COMPLETED
+};
+
+enum iser_data_dir {
+	ISER_DIR_IN = 0,	   /* to initiator */
+	ISER_DIR_OUT,		   /* from initiator */
+	ISER_DIRS_NUM
+};
+
+/**
+ * struct iser_data_buf - iSER data buffer
+ *
+ * @sg:           pointer to the sg list
+ * @size:         num entries of this sg
+ * @data_len:     total beffer byte len
+ * @dma_nents:    returned by dma_map_sg
+ */
+struct iser_data_buf {
+	struct scatterlist *sg;
+	int                size;
+	unsigned long      data_len;
+	int                dma_nents;
+};
+
+/* fwd declarations */
+struct iser_device;
+struct iscsi_iser_task;
+struct iscsi_endpoint;
+struct iser_reg_resources;
+
+/**
+ * struct iser_mem_reg - iSER memory registration info
+ *
+ * @sge:          memory region sg element
+ * @rkey:         memory region remote key
+ * @desc:         pointer to fast registration context
+ */
+struct iser_mem_reg {
+	struct ib_sge sge;
+	u32 rkey;
+	struct iser_fr_desc *desc;
+};
+
+enum iser_desc_type {
+	ISCSI_TX_CONTROL ,
+	ISCSI_TX_SCSI_COMMAND,
+	ISCSI_TX_DATAOUT
+};
+
+/**
+ * struct iser_tx_desc - iSER TX descriptor
+ *
+ * @iser_header:   iser header
+ * @iscsi_header:  iscsi header
+ * @type:          command/control/dataout
+ * @dma_addr:      header buffer dma_address
+ * @tx_sg:         sg[0] points to iser/iscsi headers
+ *                 sg[1] optionally points to either of immediate data
+ *                 unsolicited data-out or control
+ * @num_sge:       number sges used on this TX task
+ * @cqe:           completion handler
+ * @mapped:        Is the task header mapped
+ * @reg_wr:        registration WR
+ * @send_wr:       send WR
+ * @inv_wr:        invalidate WR
+ */
+struct iser_tx_desc {
+	struct iser_ctrl             iser_header;
+	struct iscsi_hdr             iscsi_header;
+	enum   iser_desc_type        type;
+	u64		             dma_addr;
+	struct ib_sge		     tx_sg[2];
+	int                          num_sge;
+	struct ib_cqe		     cqe;
+	bool			     mapped;
+	struct ib_reg_wr	     reg_wr;
+	struct ib_send_wr	     send_wr;
+	struct ib_send_wr	     inv_wr;
+};
+
+#define ISER_RX_PAD_SIZE	(256 - (ISER_RX_PAYLOAD_SIZE + \
+				 sizeof(u64) + sizeof(struct ib_sge) + \
+				 sizeof(struct ib_cqe)))
+/**
+ * struct iser_rx_desc - iSER RX descriptor
+ *
+ * @iser_header:   iser header
+ * @iscsi_header:  iscsi header
+ * @data:          received data segment
+ * @dma_addr:      receive buffer dma address
+ * @rx_sg:         ib_sge of receive buffer
+ * @cqe:           completion handler
+ * @pad:           for sense data TODO: Modify to maximum sense length supported
+ */
+struct iser_rx_desc {
+	struct iser_ctrl             iser_header;
+	struct iscsi_hdr             iscsi_header;
+	char		             data[ISER_RECV_DATA_SEG_LEN];
+	u64		             dma_addr;
+	struct ib_sge		     rx_sg;
+	struct ib_cqe		     cqe;
+	char		             pad[ISER_RX_PAD_SIZE];
+} __packed;
+
+/**
+ * struct iser_login_desc - iSER login descriptor
+ *
+ * @req:           pointer to login request buffer
+ * @rsp:           pointer to login response buffer
+ * @req_dma:       DMA address of login request buffer
+ * @rsp_dma:       DMA address of login response buffer
+ * @sge:           IB sge for login post recv
+ * @cqe:           completion handler
+ */
+struct iser_login_desc {
+	void                         *req;
+	void                         *rsp;
+	u64                          req_dma;
+	u64                          rsp_dma;
+	struct ib_sge                sge;
+	struct ib_cqe		     cqe;
+} __packed;
+
+struct iser_conn;
+struct ib_conn;
+
+/**
+ * struct iser_device - iSER device handle
+ *
+ * @ib_device:     RDMA device
+ * @pd:            Protection Domain for this device
+ * @mr:            Global DMA memory region
+ * @event_handler: IB events handle routine
+ * @ig_list:	   entry in devices list
+ * @refcount:      Reference counter, dominated by open iser connections
+ */
+struct iser_device {
+	struct ib_device             *ib_device;
+	struct ib_pd	             *pd;
+	struct ib_event_handler      event_handler;
+	struct list_head             ig_list;
+	int                          refcount;
+};
+
+/**
+ * struct iser_reg_resources - Fast registration resources
+ *
+ * @mr:         memory region
+ * @sig_mr:     signature memory region
+ * @mr_valid:   is mr valid indicator
+ */
+struct iser_reg_resources {
+	struct ib_mr                     *mr;
+	struct ib_mr                     *sig_mr;
+	u8				  mr_valid:1;
+};
+
+/**
+ * struct iser_fr_desc - Fast registration descriptor
+ *
+ * @list:           entry in connection fastreg pool
+ * @rsc:            data buffer registration resources
+ * @sig_protected:  is region protected indicator
+ * @all_list:       first and last list members
+ */
+struct iser_fr_desc {
+	struct list_head		  list;
+	struct iser_reg_resources	  rsc;
+	bool				  sig_protected;
+	struct list_head                  all_list;
+};
+
+/**
+ * struct iser_fr_pool - connection fast registration pool
+ *
+ * @list:                list of fastreg descriptors
+ * @lock:                protects fastreg pool
+ * @size:                size of the pool
+ * @all_list:            first and last list members
+ */
+struct iser_fr_pool {
+	struct list_head        list;
+	spinlock_t              lock;
+	int                     size;
+	struct list_head        all_list;
+};
+
+/**
+ * struct ib_conn - Infiniband related objects
+ *
+ * @cma_id:              rdma_cm connection maneger handle
+ * @qp:                  Connection Queue-pair
+ * @cq:                  Connection completion queue
+ * @cq_size:             The number of max outstanding completions
+ * @device:              reference to iser device
+ * @fr_pool:             connection fast registration pool
+ * @pi_support:          Indicate device T10-PI support
+ * @reg_cqe:             completion handler
+ */
+struct ib_conn {
+	struct rdma_cm_id           *cma_id;
+	struct ib_qp	            *qp;
+	struct ib_cq		    *cq;
+	u32			    cq_size;
+	struct iser_device          *device;
+	struct iser_fr_pool          fr_pool;
+	bool			     pi_support;
+	struct ib_cqe		     reg_cqe;
+};
+
+/**
+ * struct iser_conn - iSER connection context
+ *
+ * @ib_conn:          connection RDMA resources
+ * @iscsi_conn:       link to matching iscsi connection
+ * @ep:               transport handle
+ * @state:            connection logical state
+ * @qp_max_recv_dtos: maximum number of data outs, corresponds
+ *                    to max number of post recvs
+ * @max_cmds:         maximum cmds allowed for this connection
+ * @name:             connection peer portal
+ * @release_work:     deffered work for release job
+ * @state_mutex:      protects iser onnection state
+ * @stop_completion:  conn_stop completion
+ * @ib_completion:    RDMA cleanup completion
+ * @up_completion:    connection establishment completed
+ *                    (state is ISER_CONN_UP)
+ * @conn_list:        entry in ig conn list
+ * @login_desc:       login descriptor
+ * @rx_descs:         rx buffers array (cyclic buffer)
+ * @num_rx_descs:     number of rx descriptors
+ * @scsi_sg_tablesize: scsi host sg_tablesize
+ * @pages_per_mr:     maximum pages available for registration
+ * @snd_w_inv:        connection uses remote invalidation
+ */
+struct iser_conn {
+	struct ib_conn		     ib_conn;
+	struct iscsi_conn	     *iscsi_conn;
+	struct iscsi_endpoint	     *ep;
+	enum iser_conn_state	     state;
+	unsigned		     qp_max_recv_dtos;
+	u16                          max_cmds;
+	char 			     name[ISER_OBJECT_NAME_SIZE];
+	struct work_struct	     release_work;
+	struct mutex		     state_mutex;
+	struct completion	     stop_completion;
+	struct completion	     ib_completion;
+	struct completion	     up_completion;
+	struct list_head	     conn_list;
+	struct iser_login_desc       login_desc;
+	struct iser_rx_desc	     *rx_descs;
+	u32                          num_rx_descs;
+	unsigned short               scsi_sg_tablesize;
+	unsigned short               pages_per_mr;
+	bool			     snd_w_inv;
+};
+
+/**
+ * struct iscsi_iser_task - iser task context
+ *
+ * @desc:     TX descriptor
+ * @iser_conn:        link to iser connection
+ * @status:           current task status
+ * @sc:               link to scsi command
+ * @command_sent:     indicate if command was sent
+ * @dir:              iser data direction
+ * @rdma_reg:         task rdma registration desc
+ * @data:             iser data buffer desc
+ * @prot:             iser protection buffer desc
+ */
+struct iscsi_iser_task {
+	struct iser_tx_desc          desc;
+	struct iser_conn	     *iser_conn;
+	enum iser_task_status 	     status;
+	struct scsi_cmnd	     *sc;
+	int                          command_sent;
+	int                          dir[ISER_DIRS_NUM];
+	struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
+	struct iser_data_buf         data[ISER_DIRS_NUM];
+	struct iser_data_buf         prot[ISER_DIRS_NUM];
+};
+
+/**
+ * struct iser_global - iSER global context
+ *
+ * @device_list_mutex:    protects device_list
+ * @device_list:          iser devices global list
+ * @connlist_mutex:       protects connlist
+ * @connlist:             iser connections global list
+ * @desc_cache:           kmem cache for tx dataout
+ */
+struct iser_global {
+	struct mutex      device_list_mutex;
+	struct list_head  device_list;
+	struct mutex      connlist_mutex;
+	struct list_head  connlist;
+	struct kmem_cache *desc_cache;
+};
+
+extern struct iser_global ig;
+extern int iser_debug_level;
+extern bool iser_pi_enable;
+extern unsigned int iser_max_sectors;
+extern bool iser_always_reg;
+
+int iser_send_control(struct iscsi_conn *conn,
+		      struct iscsi_task *task);
+
+int iser_send_command(struct iscsi_conn *conn,
+		      struct iscsi_task *task);
+
+int iser_send_data_out(struct iscsi_conn *conn,
+		       struct iscsi_task *task,
+		       struct iscsi_data *hdr);
+
+void iscsi_iser_recv(struct iscsi_conn *conn,
+		     struct iscsi_hdr *hdr,
+		     char *rx_data,
+		     int rx_data_len);
+
+void iser_conn_init(struct iser_conn *iser_conn);
+
+void iser_conn_release(struct iser_conn *iser_conn);
+
+int iser_conn_terminate(struct iser_conn *iser_conn);
+
+void iser_release_work(struct work_struct *work);
+
+void iser_err_comp(struct ib_wc *wc, const char *type);
+void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
+
+void iser_task_rdma_init(struct iscsi_iser_task *task);
+
+void iser_task_rdma_finalize(struct iscsi_iser_task *task);
+
+void iser_free_rx_descriptors(struct iser_conn *iser_conn);
+
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
+				     struct iser_data_buf *mem,
+				     enum iser_data_dir cmd_dir);
+
+int iser_reg_mem_fastreg(struct iscsi_iser_task *task,
+			 enum iser_data_dir dir,
+			 bool all_imm);
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *task,
+			    enum iser_data_dir dir);
+
+int  iser_connect(struct iser_conn *iser_conn,
+		  struct sockaddr *src_addr,
+		  struct sockaddr *dst_addr,
+		  int non_blocking);
+
+int  iser_post_recvl(struct iser_conn *iser_conn);
+int  iser_post_recvm(struct iser_conn *iser_conn,
+		     struct iser_rx_desc *rx_desc);
+int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc);
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+			   enum iser_data_dir iser_dir,
+			   enum dma_data_direction dma_dir);
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+			      enum iser_data_dir iser_dir,
+			      enum dma_data_direction dma_dir);
+
+int  iser_initialize_task_headers(struct iscsi_task *task,
+			struct iser_tx_desc *tx_desc);
+int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
+			      struct iscsi_session *session);
+int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
+			    unsigned cmds_max,
+			    unsigned int size);
+void iser_free_fastreg_pool(struct ib_conn *ib_conn);
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+			     enum iser_data_dir cmd_dir, sector_t *sector);
+
+static inline struct iser_conn *
+to_iser_conn(struct ib_conn *ib_conn)
+{
+	return container_of(ib_conn, struct iser_conn, ib_conn);
+}
+
+static inline struct iser_rx_desc *
+iser_rx(struct ib_cqe *cqe)
+{
+	return container_of(cqe, struct iser_rx_desc, cqe);
+}
+
+static inline struct iser_tx_desc *
+iser_tx(struct ib_cqe *cqe)
+{
+	return container_of(cqe, struct iser_tx_desc, cqe);
+}
+
+static inline struct iser_login_desc *
+iser_login(struct ib_cqe *cqe)
+{
+	return container_of(cqe, struct iser_login_desc, cqe);
+}
+
+#endif