LXR linux/drivers/infiniband/ulp/iser/iscsi

   1/*
   2 * iSER transport for the Open iSCSI Initiator & iSER transport internals
   3 *
   4 * Copyright (C) 2004 Dmitry Yusupov
   5 * Copyright (C) 2004 Alex Aizman
   6 * Copyright (C) 2005 Mike Christie
   7 * based on code maintained by open-iscsi@googlegroups.com
   8 *
   9 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
  10 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  11 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
  12 *
  13 * This software is available to you under a choice of one of two
  14 * licenses.  You may choose to be licensed under the terms of the GNU
  15 * General Public License (GPL) Version 2, available from the file
  16 * COPYING in the main directory of this source tree, or the
  17 * OpenIB.org BSD license below:
  18 *
  19 *     Redistribution and use in source and binary forms, with or
  20 *     without modification, are permitted provided that the following
  21 *     conditions are met:
  22 *
  23 *      - Redistributions of source code must retain the above
  24 *        copyright notice, this list of conditions and the following
  25 *        disclaimer.
  26 *
  27 *      - Redistributions in binary form must reproduce the above
  28 *        copyright notice, this list of conditions and the following
  29 *        disclaimer in the documentation and/or other materials
  30 *        provided with the distribution.
  31 *
  32 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  33 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  34 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  35 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  36 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  37 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  38 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  39 * SOFTWARE.
  40 */
  41#ifndef __ISCSI_ISER_H__
  42#define __ISCSI_ISER_H__
  43
  44#include <linux/types.h>
  45#include <linux/net.h>
  46#include <linux/printk.h>
  47#include <scsi/libiscsi.h>
  48#include <scsi/scsi_transport_iscsi.h>
  49#include <scsi/scsi_cmnd.h>
  50#include <scsi/scsi_device.h>
  51#include <scsi/iser.h>
  52
  53#include <linux/interrupt.h>
  54#include <linux/wait.h>
  55#include <linux/sched.h>
  56#include <linux/list.h>
  57#include <linux/slab.h>
  58#include <linux/dma-mapping.h>
  59#include <linux/mutex.h>
  60#include <linux/mempool.h>
  61#include <linux/uio.h>
  62
  63#include <linux/socket.h>
  64#include <linux/in.h>
  65#include <linux/in6.h>
  66
  67#include <rdma/ib_verbs.h>
  68#include <rdma/rdma_cm.h>
  69
  70#define DRV_NAME        "iser"
  71#define PFX             DRV_NAME ": "
  72#define DRV_VER         "1.6"
  73
  74#define iser_dbg(fmt, arg...)                            \
  75        do {                                             \
  76                if (unlikely(iser_debug_level > 2))      \
  77                        printk(KERN_DEBUG PFX "%s: " fmt,\
  78                                __func__ , ## arg);      \
  79        } while (0)
  80
  81#define iser_warn(fmt, arg...)                          \
  82        do {                                            \
  83                if (unlikely(iser_debug_level > 0))     \
  84                        pr_warn(PFX "%s: " fmt,         \
  85                                __func__ , ## arg);     \
  86        } while (0)
  87
  88#define iser_info(fmt, arg...)                          \
  89        do {                                            \
  90                if (unlikely(iser_debug_level > 1))     \
  91                        pr_info(PFX "%s: " fmt,         \
  92                                __func__ , ## arg);     \
  93        } while (0)
  94
  95#define iser_err(fmt, arg...) \
  96        pr_err(PFX "%s: " fmt, __func__ , ## arg)
  97
  98/* Default support is 512KB I/O size */
  99#define ISER_DEF_MAX_SECTORS            1024
 100#define ISCSI_ISER_DEF_SG_TABLESIZE                                            \
 101        ((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K))
 102/* Maximum support is 16MB I/O size */
 103#define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K))
 104
 105#define ISER_DEF_XMIT_CMDS_DEFAULT              512
 106#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
 107        #define ISER_DEF_XMIT_CMDS_MAX          ISCSI_DEF_XMIT_CMDS_MAX
 108#else
 109        #define ISER_DEF_XMIT_CMDS_MAX          ISER_DEF_XMIT_CMDS_DEFAULT
 110#endif
 111#define ISER_DEF_CMD_PER_LUN            ISER_DEF_XMIT_CMDS_MAX
 112
 113/* QP settings */
 114/* Maximal bounds on received asynchronous PDUs */
 115#define ISER_MAX_RX_MISC_PDUS           4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
 116
 117#define ISER_MAX_TX_MISC_PDUS           6 /* NOOP_OUT(2), TEXT(1),         *
 118                                           * SCSI_TMFUNC(2), LOGOUT(1) */
 119
 120#define ISER_QP_MAX_RECV_DTOS           (ISER_DEF_XMIT_CMDS_MAX)
 121
 122#define ISER_MIN_POSTED_RX              (ISER_DEF_XMIT_CMDS_MAX >> 2)
 123
 124/* the max TX (send) WR supported by the iSER QP is defined by                 *
 125 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 126 * to have at max for SCSI command. The tx posting & completion handling code  *
 127 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 128 * send WR. D=8 comes from 64K/8K                                              */
 129
 130#define ISER_INFLIGHT_DATAOUTS          8
 131
 132#define ISER_QP_MAX_REQ_DTOS            (ISER_DEF_XMIT_CMDS_MAX *    \
 133                                        (1 + ISER_INFLIGHT_DATAOUTS) + \
 134                                        ISER_MAX_TX_MISC_PDUS        + \
 135                                        ISER_MAX_RX_MISC_PDUS)
 136
 137/* Max registration work requests per command */
 138#define ISER_MAX_REG_WR_PER_CMD         5
 139
 140/* For Signature we don't support DATAOUTs so no need to make room for them */
 141#define ISER_QP_SIG_MAX_REQ_DTOS        (ISER_DEF_XMIT_CMDS_MAX *       \
 142                                        (1 + ISER_MAX_REG_WR_PER_CMD) + \
 143                                        ISER_MAX_TX_MISC_PDUS         + \
 144                                        ISER_MAX_RX_MISC_PDUS)
 145
 146#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr                       \
 147                                         - ISER_MAX_TX_MISC_PDUS        \
 148                                         - ISER_MAX_RX_MISC_PDUS) /     \
 149                                         (1 + ISER_INFLIGHT_DATAOUTS))
 150
 151#define ISER_SIGNAL_CMD_COUNT 32
 152
 153/* Constant PDU lengths calculations */
 154#define ISER_HEADERS_LEN        (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
 155
 156#define ISER_RECV_DATA_SEG_LEN  128
 157#define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 158#define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 159
 160/* Length of an object name string */
 161#define ISER_OBJECT_NAME_SIZE               64
 162
 163enum iser_conn_state {
 164        ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 165        ISER_CONN_PENDING,         /* in the process of being established */
 166        ISER_CONN_UP,              /* up and running                      */
 167        ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 168        ISER_CONN_DOWN,            /* shut down                           */
 169        ISER_CONN_STATES_NUM
 170};
 171
 172enum iser_task_status {
 173        ISER_TASK_STATUS_INIT = 0,
 174        ISER_TASK_STATUS_STARTED,
 175        ISER_TASK_STATUS_COMPLETED
 176};
 177
 178enum iser_data_dir {
 179        ISER_DIR_IN = 0,           /* to initiator */
 180        ISER_DIR_OUT,              /* from initiator */
 181        ISER_DIRS_NUM
 182};
 183
 184/**
 185 * struct iser_data_buf - iSER data buffer
 186 *
 187 * @sg:           pointer to the sg list
 188 * @size:         num entries of this sg
 189 * @data_len:     total beffer byte len
 190 * @dma_nents:    returned by dma_map_sg
 191 */
 192struct iser_data_buf {
 193        struct scatterlist *sg;
 194        int                size;
 195        unsigned long      data_len;
 196        int                dma_nents;
 197};
 198
 199/* fwd declarations */
 200struct iser_device;
 201struct iscsi_iser_task;
 202struct iscsi_endpoint;
 203struct iser_reg_resources;
 204
 205/**
 206 * struct iser_mem_reg - iSER memory registration info
 207 *
 208 * @sge:          memory region sg element
 209 * @rkey:         memory region remote key
 210 * @mem_h:        pointer to registration context (FMR/Fastreg)
 211 */
 212struct iser_mem_reg {
 213        struct ib_sge    sge;
 214        u32              rkey;
 215        void            *mem_h;
 216};
 217
 218enum iser_desc_type {
 219        ISCSI_TX_CONTROL ,
 220        ISCSI_TX_SCSI_COMMAND,
 221        ISCSI_TX_DATAOUT
 222};
 223
 224/**
 225 * struct iser_tx_desc - iSER TX descriptor
 226 *
 227 * @iser_header:   iser header
 228 * @iscsi_header:  iscsi header
 229 * @type:          command/control/dataout
 230 * @dma_addr:      header buffer dma_address
 231 * @tx_sg:         sg[0] points to iser/iscsi headers
 232 *                 sg[1] optionally points to either of immediate data
 233 *                 unsolicited data-out or control
 234 * @num_sge:       number sges used on this TX task
 235 * @cqe:           completion handler
 236 * @mapped:        Is the task header mapped
 237 * @reg_wr:        registration WR
 238 * @send_wr:       send WR
 239 * @inv_wr:        invalidate WR
 240 */
 241struct iser_tx_desc {
 242        struct iser_ctrl             iser_header;
 243        struct iscsi_hdr             iscsi_header;
 244        enum   iser_desc_type        type;
 245        u64                          dma_addr;
 246        struct ib_sge                tx_sg[2];
 247        int                          num_sge;
 248        struct ib_cqe                cqe;
 249        bool                         mapped;
 250        struct ib_reg_wr             reg_wr;
 251        struct ib_send_wr            send_wr;
 252        struct ib_send_wr            inv_wr;
 253};
 254
 255#define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 256                                 sizeof(u64) + sizeof(struct ib_sge) + \
 257                                 sizeof(struct ib_cqe)))
 258/**
 259 * struct iser_rx_desc - iSER RX descriptor
 260 *
 261 * @iser_header:   iser header
 262 * @iscsi_header:  iscsi header
 263 * @data:          received data segment
 264 * @dma_addr:      receive buffer dma address
 265 * @rx_sg:         ib_sge of receive buffer
 266 * @cqe:           completion handler
 267 * @pad:           for sense data TODO: Modify to maximum sense length supported
 268 */
 269struct iser_rx_desc {
 270        struct iser_ctrl             iser_header;
 271        struct iscsi_hdr             iscsi_header;
 272        char                         data[ISER_RECV_DATA_SEG_LEN];
 273        u64                          dma_addr;
 274        struct ib_sge                rx_sg;
 275        struct ib_cqe                cqe;
 276        char                         pad[ISER_RX_PAD_SIZE];
 277} __packed;
 278
 279/**
 280 * struct iser_login_desc - iSER login descriptor
 281 *
 282 * @req:           pointer to login request buffer
 283 * @rsp:           pointer to login response buffer
 284 * @req_dma:       DMA address of login request buffer
 285 * @rsp_dma:       DMA address of login response buffer
 286 * @sge:           IB sge for login post recv
 287 * @cqe:           completion handler
 288 */
 289struct iser_login_desc {
 290        void                         *req;
 291        void                         *rsp;
 292        u64                          req_dma;
 293        u64                          rsp_dma;
 294        struct ib_sge                sge;
 295        struct ib_cqe                cqe;
 296} __packed;
 297
 298struct iser_conn;
 299struct ib_conn;
 300struct iscsi_iser_task;
 301
 302/**
 303 * struct iser_device - iSER device handle
 304 *
 305 * @ib_device:     RDMA device
 306 * @pd:            Protection Domain for this device
 307 * @mr:            Global DMA memory region
 308 * @event_handler: IB events handle routine
 309 * @ig_list:       entry in devices list
 310 * @refcount:      Reference counter, dominated by open iser connections
 311 */
 312struct iser_device {
 313        struct ib_device             *ib_device;
 314        struct ib_pd                 *pd;
 315        struct ib_event_handler      event_handler;
 316        struct list_head             ig_list;
 317        int                          refcount;
 318};
 319
 320/**
 321 * struct iser_reg_resources - Fast registration resources
 322 *
 323 * @mr:         memory region
 324 * @sig_mr:     signature memory region
 325 * @mr_valid:   is mr valid indicator
 326 */
 327struct iser_reg_resources {
 328        struct ib_mr                     *mr;
 329        struct ib_mr                     *sig_mr;
 330        u8                                mr_valid:1;
 331};
 332
 333/**
 334 * struct iser_fr_desc - Fast registration descriptor
 335 *
 336 * @list:           entry in connection fastreg pool
 337 * @rsc:            data buffer registration resources
 338 * @sig_protected:  is region protected indicator
 339 * @all_list:       first and last list members
 340 */
 341struct iser_fr_desc {
 342        struct list_head                  list;
 343        struct iser_reg_resources         rsc;
 344        bool                              sig_protected;
 345        struct list_head                  all_list;
 346};
 347
 348/**
 349 * struct iser_fr_pool - connection fast registration pool
 350 *
 351 * @list:                list of fastreg descriptors
 352 * @lock:                protects fastreg pool
 353 * @size:                size of the pool
 354 * @all_list:            first and last list members
 355 */
 356struct iser_fr_pool {
 357        struct list_head        list;
 358        spinlock_t              lock;
 359        int                     size;
 360        struct list_head        all_list;
 361};
 362
 363/**
 364 * struct ib_conn - Infiniband related objects
 365 *
 366 * @cma_id:              rdma_cm connection maneger handle
 367 * @qp:                  Connection Queue-pair
 368 * @cq:                  Connection completion queue
 369 * @cq_size:             The number of max outstanding completions
 370 * @post_recv_buf_count: post receive counter
 371 * @sig_count:           send work request signal count
 372 * @rx_wr:               receive work request for batch posts
 373 * @device:              reference to iser device
 374 * @fr_pool:             connection fast registration poool
 375 * @pi_support:          Indicate device T10-PI support
 376 * @reg_cqe:             completion handler
 377 */
 378struct ib_conn {
 379        struct rdma_cm_id           *cma_id;
 380        struct ib_qp                *qp;
 381        struct ib_cq                *cq;
 382        u32                         cq_size;
 383        int                          post_recv_buf_count;
 384        u8                           sig_count;
 385        struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 386        struct iser_device          *device;
 387        struct iser_fr_pool          fr_pool;
 388        bool                         pi_support;
 389        struct ib_cqe                reg_cqe;
 390};
 391
 392/**
 393 * struct iser_conn - iSER connection context
 394 *
 395 * @ib_conn:          connection RDMA resources
 396 * @iscsi_conn:       link to matching iscsi connection
 397 * @ep:               transport handle
 398 * @state:            connection logical state
 399 * @qp_max_recv_dtos: maximum number of data outs, corresponds
 400 *                    to max number of post recvs
 401 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 402 * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 403 * @max_cmds:         maximum cmds allowed for this connection
 404 * @name:             connection peer portal
 405 * @release_work:     deffered work for release job
 406 * @state_mutex:      protects iser onnection state
 407 * @stop_completion:  conn_stop completion
 408 * @ib_completion:    RDMA cleanup completion
 409 * @up_completion:    connection establishment completed
 410 *                    (state is ISER_CONN_UP)
 411 * @conn_list:        entry in ig conn list
 412 * @login_desc:       login descriptor
 413 * @rx_desc_head:     head of rx_descs cyclic buffer
 414 * @rx_descs:         rx buffers array (cyclic buffer)
 415 * @num_rx_descs:     number of rx descriptors
 416 * @scsi_sg_tablesize: scsi host sg_tablesize
 417 * @pages_per_mr:     maximum pages available for registration
 418 * @snd_w_inv:        connection uses remote invalidation
 419 */
 420struct iser_conn {
 421        struct ib_conn               ib_conn;
 422        struct iscsi_conn            *iscsi_conn;
 423        struct iscsi_endpoint        *ep;
 424        enum iser_conn_state         state;
 425        unsigned                     qp_max_recv_dtos;
 426        unsigned                     qp_max_recv_dtos_mask;
 427        unsigned                     min_posted_rx;
 428        u16                          max_cmds;
 429        char                         name[ISER_OBJECT_NAME_SIZE];
 430        struct work_struct           release_work;
 431        struct mutex                 state_mutex;
 432        struct completion            stop_completion;
 433        struct completion            ib_completion;
 434        struct completion            up_completion;
 435        struct list_head             conn_list;
 436        struct iser_login_desc       login_desc;
 437        unsigned int                 rx_desc_head;
 438        struct iser_rx_desc          *rx_descs;
 439        u32                          num_rx_descs;
 440        unsigned short               scsi_sg_tablesize;
 441        unsigned short               pages_per_mr;
 442        bool                         snd_w_inv;
 443};
 444
 445/**
 446 * struct iscsi_iser_task - iser task context
 447 *
 448 * @desc:     TX descriptor
 449 * @iser_conn:        link to iser connection
 450 * @status:           current task status
 451 * @sc:               link to scsi command
 452 * @command_sent:     indicate if command was sent
 453 * @dir:              iser data direction
 454 * @rdma_reg:         task rdma registration desc
 455 * @data:             iser data buffer desc
 456 * @prot:             iser protection buffer desc
 457 */
 458struct iscsi_iser_task {
 459        struct iser_tx_desc          desc;
 460        struct iser_conn             *iser_conn;
 461        enum iser_task_status        status;
 462        struct scsi_cmnd             *sc;
 463        int                          command_sent;
 464        int                          dir[ISER_DIRS_NUM];
 465        struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 466        struct iser_data_buf         data[ISER_DIRS_NUM];
 467        struct iser_data_buf         prot[ISER_DIRS_NUM];
 468};
 469
 470/**
 471 * struct iser_global - iSER global context
 472 *
 473 * @device_list_mutex:    protects device_list
 474 * @device_list:          iser devices global list
 475 * @connlist_mutex:       protects connlist
 476 * @connlist:             iser connections global list
 477 * @desc_cache:           kmem cache for tx dataout
 478 */
 479struct iser_global {
 480        struct mutex      device_list_mutex;
 481        struct list_head  device_list;
 482        struct mutex      connlist_mutex;
 483        struct list_head  connlist;
 484        struct kmem_cache *desc_cache;
 485};
 486
 487extern struct iser_global ig;
 488extern int iser_debug_level;
 489extern bool iser_pi_enable;
 490extern int iser_pi_guard;
 491extern unsigned int iser_max_sectors;
 492extern bool iser_always_reg;
 493
 494int iser_send_control(struct iscsi_conn *conn,
 495                      struct iscsi_task *task);
 496
 497int iser_send_command(struct iscsi_conn *conn,
 498                      struct iscsi_task *task);
 499
 500int iser_send_data_out(struct iscsi_conn *conn,
 501                       struct iscsi_task *task,
 502                       struct iscsi_data *hdr);
 503
 504void iscsi_iser_recv(struct iscsi_conn *conn,
 505                     struct iscsi_hdr *hdr,
 506                     char *rx_data,
 507                     int rx_data_len);
 508
 509void iser_conn_init(struct iser_conn *iser_conn);
 510
 511void iser_conn_release(struct iser_conn *iser_conn);
 512
 513int iser_conn_terminate(struct iser_conn *iser_conn);
 514
 515void iser_release_work(struct work_struct *work);
 516
 517void iser_err_comp(struct ib_wc *wc, const char *type);
 518void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
 519void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
 520void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
 521void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
 522void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
 523void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
 524
 525void iser_task_rdma_init(struct iscsi_iser_task *task);
 526
 527void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 528
 529void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 530
 531void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 532                                     struct iser_data_buf *mem,
 533                                     enum iser_data_dir cmd_dir);
 534
 535int iser_reg_mem_fastreg(struct iscsi_iser_task *task,
 536                         enum iser_data_dir dir,
 537                         bool all_imm);
 538void iser_unreg_mem_fastreg(struct iscsi_iser_task *task,
 539                            enum iser_data_dir dir);
 540
 541int  iser_connect(struct iser_conn *iser_conn,
 542                  struct sockaddr *src_addr,
 543                  struct sockaddr *dst_addr,
 544                  int non_blocking);
 545
 546int  iser_post_recvl(struct iser_conn *iser_conn);
 547int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 548int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 549                    bool signal);
 550
 551int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 552                           struct iser_data_buf *data,
 553                           enum iser_data_dir iser_dir,
 554                           enum dma_data_direction dma_dir);
 555
 556void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 557                              struct iser_data_buf *data,
 558                              enum dma_data_direction dir);
 559
 560int  iser_initialize_task_headers(struct iscsi_task *task,
 561                        struct iser_tx_desc *tx_desc);
 562int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 563                              struct iscsi_session *session);
 564int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
 565                            unsigned cmds_max,
 566                            unsigned int size);
 567void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 568u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 569                             enum iser_data_dir cmd_dir, sector_t *sector);
 570
 571static inline struct iser_conn *
 572to_iser_conn(struct ib_conn *ib_conn)
 573{
 574        return container_of(ib_conn, struct iser_conn, ib_conn);
 575}
 576
 577static inline struct iser_rx_desc *
 578iser_rx(struct ib_cqe *cqe)
 579{
 580        return container_of(cqe, struct iser_rx_desc, cqe);
 581}
 582
 583static inline struct iser_tx_desc *
 584iser_tx(struct ib_cqe *cqe)
 585{
 586        return container_of(cqe, struct iser_tx_desc, cqe);
 587}
 588
 589static inline struct iser_login_desc *
 590iser_login(struct ib_cqe *cqe)
 591{
 592        return container_of(cqe, struct iser_login_desc, cqe);
 593}
 594
 595#endif
 596