/*
 * 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/ib_fmr_pool.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)

#define SHIFT_4K        12
#define SIZE_4K (1ULL << SHIFT_4K)
#define MASK_4K (~(SIZE_4K-1))

/* 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) >> SHIFT_4K)
/* Maximum support is 16MB I/O size */
#define ISCSI_ISER_MAX_SG_TABLESIZE     ((32768 * SECTOR_SIZE) >> SHIFT_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)

#define ISER_MIN_POSTED_RX              (ISER_DEF_XMIT_CMDS_MAX >> 2)

/* 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))

#define ISER_SIGNAL_CMD_COUNT 32

/* 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
 * @mem_h:        pointer to registration context (FMR/Fastreg)
 */
struct iser_mem_reg {
        struct ib_sge    sge;
        u32              rkey;
        void            *mem_h;
};

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
 * @dam_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
 * @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
 * @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
 * @resp:          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 iscsi_iser_task;

/**
 * struct iser_comp - iSER completion context
 *
 * @cq:         completion queue
 * @active_qps: Number of active QPs attached
 *              to completion context
 */
struct iser_comp {
        struct ib_cq            *cq;
        int                      active_qps;
};

/**
 * struct iser_device - Memory registration operations
 *     per-device registration schemes
 *
 * @alloc_reg_res:     Allocate registration resources
 * @free_reg_res:      Free registration resources
 * @fast_reg_mem:      Register memory buffers
 * @unreg_mem:         Un-register memory buffers
 * @reg_desc_get:      Get a registration descriptor for pool
 * @reg_desc_put:      Get a registration descriptor to pool
 */
struct iser_reg_ops {
        int            (*alloc_reg_res)(struct ib_conn *ib_conn,
                                        unsigned cmds_max,
                                        unsigned int size);
        void           (*free_reg_res)(struct ib_conn *ib_conn);
        int            (*reg_mem)(struct iscsi_iser_task *iser_task,
                                  struct iser_data_buf *mem,
                                  struct iser_reg_resources *rsc,
                                  struct iser_mem_reg *reg);
        void           (*unreg_mem)(struct iscsi_iser_task *iser_task,
                                    enum iser_data_dir cmd_dir);
        struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
        void           (*reg_desc_put)(struct ib_conn *ib_conn,
                                       struct iser_fr_desc *desc);
};

/**
 * 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
 * @comps_used:    Number of completion contexts used, Min between online
 *                 cpus and device max completion vectors
 * @comps:         Dinamically allocated array of completion handlers
 * @reg_ops:       Registration ops
 * @remote_inv_sup: Remote invalidate is supported on this device
 */
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;
        int                          comps_used;
        struct iser_comp             *comps;
        const struct iser_reg_ops    *reg_ops;
        bool                         remote_inv_sup;
};

/**
 * struct iser_reg_resources - Fast registration recources
 *
 * @mr:         memory region
 * @fmr_pool:   pool of fmrs
 * @sig_mr:     signature memory region
 * @page_vec:   fast reg page list used by fmr pool
 * @mr_valid:   is mr valid indicator
 */
struct iser_reg_resources {
        union {
                struct ib_mr             *mr;
                struct ib_fmr_pool       *fmr_pool;
        };
        struct ib_mr                     *sig_mr;
        struct iser_page_vec             *page_vec;
        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
 */
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 fmr/fastreg pool
 * @size:                size of the pool
 */
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
 * @post_recv_buf_count: post receive counter
 * @sig_count:           send work request signal count
 * @rx_wr:               receive work request for batch posts
 * @device:              reference to iser device
 * @comp:                iser completion context
 * @fr_pool:             connection fast registration poool
 * @pi_support:          Indicate device T10-PI support
 */
struct ib_conn {
        struct rdma_cm_id           *cma_id;
        struct ib_qp                *qp;
        int                          post_recv_buf_count;
        u8                           sig_count;
        struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
        struct iser_device          *device;
        struct iser_comp            *comp;
        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
 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 * @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_desc_head:     head of rx_descs cyclic buffer
 * @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
 */
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;
        unsigned                     qp_max_recv_dtos_mask;
        unsigned                     min_posted_rx;
        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;
        unsigned int                 rx_desc_head;
        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_page_vec {
        u64 *pages;
        int npages;
        struct ib_mr fake_mr;
};

/**
 * 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 int iser_pi_guard;
extern unsigned int iser_max_sectors;
extern bool iser_always_reg;

int iser_assign_reg_ops(struct iser_device *device);

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_rdma_mem(struct iscsi_iser_task *task,
                      enum iser_data_dir dir,
                      bool all_imm);
void iser_unreg_rdma_mem(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);

void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
                        enum iser_data_dir cmd_dir);
void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
                            enum iser_data_dir cmd_dir);

int  iser_post_recvl(struct iser_conn *iser_conn);
int  iser_post_recvm(struct iser_conn *iser_conn, int count);
int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
                    bool signal);

int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
                           struct iser_data_buf *data,
                           enum iser_data_dir iser_dir,
                           enum dma_data_direction dma_dir);

void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
                              struct iser_data_buf *data,
                              enum dma_data_direction 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_fmr_pool(struct ib_conn *ib_conn,
                        unsigned cmds_max,
                        unsigned int size);
void iser_free_fmr_pool(struct ib_conn *ib_conn);
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);
struct iser_fr_desc *
iser_reg_desc_get_fr(struct ib_conn *ib_conn);
void
iser_reg_desc_put_fr(struct ib_conn *ib_conn,
                     struct iser_fr_desc *desc);
struct iser_fr_desc *
iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
void
iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
                      struct iser_fr_desc *desc);

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