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
  52#include <linux/interrupt.h>
  53#include <linux/wait.h>
  54#include <linux/sched.h>
  55#include <linux/list.h>
  56#include <linux/slab.h>
  57#include <linux/dma-mapping.h>
  58#include <linux/mutex.h>
  59#include <linux/mempool.h>
  60#include <linux/uio.h>
  61
  62#include <linux/socket.h>
  63#include <linux/in.h>
  64#include <linux/in6.h>
  65
  66#include <rdma/ib_verbs.h>
  67#include <rdma/ib_fmr_pool.h>
  68#include <rdma/rdma_cm.h>
  69
  70#define DRV_NAME        "iser"
  71#define PFX             DRV_NAME ": "
  72#define DRV_VER         "1.5"
  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#define SHIFT_4K        12
  99#define SIZE_4K (1ULL << SHIFT_4K)
 100#define MASK_4K (~(SIZE_4K-1))
 101                                        /* support up to 512KB in one RDMA */
 102#define ISCSI_ISER_SG_TABLESIZE         (0x80000 >> SHIFT_4K)
 103#define ISER_DEF_XMIT_CMDS_DEFAULT              512
 104#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
 105        #define ISER_DEF_XMIT_CMDS_MAX          ISCSI_DEF_XMIT_CMDS_MAX
 106#else
 107        #define ISER_DEF_XMIT_CMDS_MAX          ISER_DEF_XMIT_CMDS_DEFAULT
 108#endif
 109#define ISER_DEF_CMD_PER_LUN            ISER_DEF_XMIT_CMDS_MAX
 110
 111/* QP settings */
 112/* Maximal bounds on received asynchronous PDUs */
 113#define ISER_MAX_RX_MISC_PDUS           4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
 114
 115#define ISER_MAX_TX_MISC_PDUS           6 /* NOOP_OUT(2), TEXT(1),         *
 116                                           * SCSI_TMFUNC(2), LOGOUT(1) */
 117
 118#define ISER_QP_MAX_RECV_DTOS           (ISER_DEF_XMIT_CMDS_MAX)
 119
 120#define ISER_MIN_POSTED_RX              (ISER_DEF_XMIT_CMDS_MAX >> 2)
 121
 122/* the max TX (send) WR supported by the iSER QP is defined by                 *
 123 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 124 * to have at max for SCSI command. The tx posting & completion handling code  *
 125 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 126 * send WR. D=8 comes from 64K/8K                                              */
 127
 128#define ISER_INFLIGHT_DATAOUTS          8
 129
 130#define ISER_QP_MAX_REQ_DTOS            (ISER_DEF_XMIT_CMDS_MAX *    \
 131                                        (1 + ISER_INFLIGHT_DATAOUTS) + \
 132                                        ISER_MAX_TX_MISC_PDUS        + \
 133                                        ISER_MAX_RX_MISC_PDUS)
 134
 135/* Max registration work requests per command */
 136#define ISER_MAX_REG_WR_PER_CMD         5
 137
 138/* For Signature we don't support DATAOUTs so no need to make room for them */
 139#define ISER_QP_SIG_MAX_REQ_DTOS        (ISER_DEF_XMIT_CMDS_MAX *       \
 140                                        (1 + ISER_MAX_REG_WR_PER_CMD) + \
 141                                        ISER_MAX_TX_MISC_PDUS         + \
 142                                        ISER_MAX_RX_MISC_PDUS)
 143
 144#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr                       \
 145                                         - ISER_MAX_TX_MISC_PDUS        \
 146                                         - ISER_MAX_RX_MISC_PDUS) /     \
 147                                         (1 + ISER_INFLIGHT_DATAOUTS))
 148
 149#define ISER_WC_BATCH_COUNT   16
 150#define ISER_SIGNAL_CMD_COUNT 32
 151
 152#define ISER_VER                        0x10
 153#define ISER_WSV                        0x08
 154#define ISER_RSV                        0x04
 155
 156#define ISER_FASTREG_LI_WRID            0xffffffffffffffffULL
 157#define ISER_BEACON_WRID                0xfffffffffffffffeULL
 158
 159/**
 160 * struct iser_hdr - iSER header
 161 *
 162 * @flags:        flags support (zbva, remote_inv)
 163 * @rsvd:         reserved
 164 * @write_stag:   write rkey
 165 * @write_va:     write virtual address
 166 * @reaf_stag:    read rkey
 167 * @read_va:      read virtual address
 168 */
 169struct iser_hdr {
 170        u8      flags;
 171        u8      rsvd[3];
 172        __be32  write_stag;
 173        __be64  write_va;
 174        __be32  read_stag;
 175        __be64  read_va;
 176} __attribute__((packed));
 177
 178
 179#define ISER_ZBVA_NOT_SUPPORTED         0x80
 180#define ISER_SEND_W_INV_NOT_SUPPORTED   0x40
 181
 182struct iser_cm_hdr {
 183        u8      flags;
 184        u8      rsvd[3];
 185} __packed;
 186
 187/* Constant PDU lengths calculations */
 188#define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
 189
 190#define ISER_RECV_DATA_SEG_LEN  128
 191#define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 192#define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 193
 194/* Length of an object name string */
 195#define ISER_OBJECT_NAME_SIZE               64
 196
 197enum iser_conn_state {
 198        ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 199        ISER_CONN_PENDING,         /* in the process of being established */
 200        ISER_CONN_UP,              /* up and running                      */
 201        ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 202        ISER_CONN_DOWN,            /* shut down                           */
 203        ISER_CONN_STATES_NUM
 204};
 205
 206enum iser_task_status {
 207        ISER_TASK_STATUS_INIT = 0,
 208        ISER_TASK_STATUS_STARTED,
 209        ISER_TASK_STATUS_COMPLETED
 210};
 211
 212enum iser_data_dir {
 213        ISER_DIR_IN = 0,           /* to initiator */
 214        ISER_DIR_OUT,              /* from initiator */
 215        ISER_DIRS_NUM
 216};
 217
 218/**
 219 * struct iser_data_buf - iSER data buffer
 220 *
 221 * @buf:          pointer to the sg list
 222 * @size:         num entries of this sg
 223 * @data_len:     total beffer byte len
 224 * @dma_nents:    returned by dma_map_sg
 225 * @copy_buf:     allocated copy buf for SGs unaligned
 226 *                for rdma which are copied
 227 * @sg_single:    SG-ified clone of a non SG SC or
 228 *                unaligned SG
 229 */
 230struct iser_data_buf {
 231        void               *buf;
 232        unsigned int       size;
 233        unsigned long      data_len;
 234        unsigned int       dma_nents;
 235        char               *copy_buf;
 236        struct scatterlist sg_single;
 237  };
 238
 239/* fwd declarations */
 240struct iser_device;
 241struct iscsi_iser_task;
 242struct iscsi_endpoint;
 243
 244/**
 245 * struct iser_mem_reg - iSER memory registration info
 246 *
 247 * @lkey:         MR local key
 248 * @rkey:         MR remote key
 249 * @va:           MR start address (buffer va)
 250 * @len:          MR length
 251 * @mem_h:        pointer to registration context (FMR/Fastreg)
 252 */
 253struct iser_mem_reg {
 254        u32  lkey;
 255        u32  rkey;
 256        u64  va;
 257        u64  len;
 258        void *mem_h;
 259};
 260
 261/**
 262 * struct iser_regd_buf - iSER buffer registration desc
 263 *
 264 * @reg:          memory registration info
 265 * @virt_addr:    virtual address of buffer
 266 * @device:       reference to iser device
 267 * @direction:    dma direction (for dma_unmap)
 268 * @data_size:    data buffer size in bytes
 269 */
 270struct iser_regd_buf {
 271        struct iser_mem_reg     reg;
 272        void                    *virt_addr;
 273        struct iser_device      *device;
 274        enum dma_data_direction direction;
 275        unsigned int            data_size;
 276};
 277
 278enum iser_desc_type {
 279        ISCSI_TX_CONTROL ,
 280        ISCSI_TX_SCSI_COMMAND,
 281        ISCSI_TX_DATAOUT
 282};
 283
 284/**
 285 * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
 286 *
 287 * @iser_header:   iser header
 288 * @iscsi_header:  iscsi header
 289 * @type:          command/control/dataout
 290 * @dam_addr:      header buffer dma_address
 291 * @tx_sg:         sg[0] points to iser/iscsi headers
 292 *                 sg[1] optionally points to either of immediate data
 293 *                 unsolicited data-out or control
 294 * @num_sge:       number sges used on this TX task
 295 */
 296struct iser_tx_desc {
 297        struct iser_hdr              iser_header;
 298        struct iscsi_hdr             iscsi_header;
 299        enum   iser_desc_type        type;
 300        u64                          dma_addr;
 301        struct ib_sge                tx_sg[2];
 302        int                          num_sge;
 303};
 304
 305#define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 306                                        sizeof(u64) + sizeof(struct ib_sge)))
 307/**
 308 * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
 309 *
 310 * @iser_header:   iser header
 311 * @iscsi_header:  iscsi header
 312 * @data:          received data segment
 313 * @dma_addr:      receive buffer dma address
 314 * @rx_sg:         ib_sge of receive buffer
 315 * @pad:           for sense data TODO: Modify to maximum sense length supported
 316 */
 317struct iser_rx_desc {
 318        struct iser_hdr              iser_header;
 319        struct iscsi_hdr             iscsi_header;
 320        char                         data[ISER_RECV_DATA_SEG_LEN];
 321        u64                          dma_addr;
 322        struct ib_sge                rx_sg;
 323        char                         pad[ISER_RX_PAD_SIZE];
 324} __attribute__((packed));
 325
 326struct iser_conn;
 327struct ib_conn;
 328struct iscsi_iser_task;
 329
 330/**
 331 * struct iser_comp - iSER completion context
 332 *
 333 * @device:     pointer to device handle
 334 * @cq:         completion queue
 335 * @wcs:        work completion array
 336 * @tasklet:    Tasklet handle
 337 * @active_qps: Number of active QPs attached
 338 *              to completion context
 339 */
 340struct iser_comp {
 341        struct iser_device      *device;
 342        struct ib_cq            *cq;
 343        struct ib_wc             wcs[ISER_WC_BATCH_COUNT];
 344        struct tasklet_struct    tasklet;
 345        int                      active_qps;
 346};
 347
 348/**
 349 * struct iser_device - iSER device handle
 350 *
 351 * @ib_device:     RDMA device
 352 * @pd:            Protection Domain for this device
 353 * @dev_attr:      Device attributes container
 354 * @mr:            Global DMA memory region
 355 * @event_handler: IB events handle routine
 356 * @ig_list:       entry in devices list
 357 * @refcount:      Reference counter, dominated by open iser connections
 358 * @comps_used:    Number of completion contexts used, Min between online
 359 *                 cpus and device max completion vectors
 360 * @comps:         Dinamically allocated array of completion handlers
 361 * Memory registration pool Function pointers (FMR or Fastreg):
 362 *     @iser_alloc_rdma_reg_res: Allocation of memory regions pool
 363 *     @iser_free_rdma_reg_res:  Free of memory regions pool
 364 *     @iser_reg_rdma_mem:       Memory registration routine
 365 *     @iser_unreg_rdma_mem:     Memory deregistration routine
 366 */
 367struct iser_device {
 368        struct ib_device             *ib_device;
 369        struct ib_pd                 *pd;
 370        struct ib_device_attr        dev_attr;
 371        struct ib_mr                 *mr;
 372        struct ib_event_handler      event_handler;
 373        struct list_head             ig_list;
 374        int                          refcount;
 375        int                          comps_used;
 376        struct iser_comp             *comps;
 377        int                          (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn,
 378                                                                unsigned cmds_max);
 379        void                         (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn);
 380        int                          (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task,
 381                                                          enum iser_data_dir cmd_dir);
 382        void                         (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task,
 383                                                            enum iser_data_dir cmd_dir);
 384};
 385
 386#define ISER_CHECK_GUARD        0xc0
 387#define ISER_CHECK_REFTAG       0x0f
 388#define ISER_CHECK_APPTAG       0x30
 389
 390enum iser_reg_indicator {
 391        ISER_DATA_KEY_VALID     = 1 << 0,
 392        ISER_PROT_KEY_VALID     = 1 << 1,
 393        ISER_SIG_KEY_VALID      = 1 << 2,
 394        ISER_FASTREG_PROTECTED  = 1 << 3,
 395};
 396
 397/**
 398 * struct iser_pi_context - Protection information context
 399 *
 400 * @prot_mr:        protection memory region
 401 * @prot_frpl:      protection fastreg page list
 402 * @sig_mr:         signature feature enabled memory region
 403 */
 404struct iser_pi_context {
 405        struct ib_mr                   *prot_mr;
 406        struct ib_fast_reg_page_list   *prot_frpl;
 407        struct ib_mr                   *sig_mr;
 408};
 409
 410/**
 411 * struct fast_reg_descriptor - Fast registration descriptor
 412 *
 413 * @list:           entry in connection fastreg pool
 414 * @data_mr:        data memory region
 415 * @data_frpl:      data fastreg page list
 416 * @pi_ctx:         protection information context
 417 * @reg_indicators: fast registration indicators
 418 */
 419struct fast_reg_descriptor {
 420        struct list_head                  list;
 421        struct ib_mr                     *data_mr;
 422        struct ib_fast_reg_page_list     *data_frpl;
 423        struct iser_pi_context           *pi_ctx;
 424        u8                                reg_indicators;
 425};
 426
 427/**
 428 * struct ib_conn - Infiniband related objects
 429 *
 430 * @cma_id:              rdma_cm connection maneger handle
 431 * @qp:                  Connection Queue-pair
 432 * @post_recv_buf_count: post receive counter
 433 * @sig_count:           send work request signal count
 434 * @rx_wr:               receive work request for batch posts
 435 * @device:              reference to iser device
 436 * @comp:                iser completion context
 437 * @pi_support:          Indicate device T10-PI support
 438 * @beacon:              beacon send wr to signal all flush errors were drained
 439 * @flush_comp:          completes when all connection completions consumed
 440 * @lock:                protects fmr/fastreg pool
 441 * @union.fmr:
 442 *     @pool:            FMR pool for fast registrations
 443 *     @page_vec:        page vector to hold mapped commands pages
 444 *                       used for registration
 445 * @union.fastreg:
 446 *     @pool:            Fast registration descriptors pool for fast
 447 *                       registrations
 448 *     @pool_size:       Size of pool
 449 */
 450struct ib_conn {
 451        struct rdma_cm_id           *cma_id;
 452        struct ib_qp                *qp;
 453        int                          post_recv_buf_count;
 454        u8                           sig_count;
 455        struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 456        struct iser_device          *device;
 457        struct iser_comp            *comp;
 458        bool                         pi_support;
 459        struct ib_send_wr            beacon;
 460        struct completion            flush_comp;
 461        spinlock_t                   lock;
 462        union {
 463                struct {
 464                        struct ib_fmr_pool      *pool;
 465                        struct iser_page_vec    *page_vec;
 466                } fmr;
 467                struct {
 468                        struct list_head         pool;
 469                        int                      pool_size;
 470                } fastreg;
 471        };
 472};
 473
 474/**
 475 * struct iser_conn - iSER connection context
 476 *
 477 * @ib_conn:          connection RDMA resources
 478 * @iscsi_conn:       link to matching iscsi connection
 479 * @ep:               transport handle
 480 * @state:            connection logical state
 481 * @qp_max_recv_dtos: maximum number of data outs, corresponds
 482 *                    to max number of post recvs
 483 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 484 * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 485 * @max_cmds:         maximum cmds allowed for this connection
 486 * @name:             connection peer portal
 487 * @release_work:     deffered work for release job
 488 * @state_mutex:      protects iser onnection state
 489 * @stop_completion:  conn_stop completion
 490 * @ib_completion:    RDMA cleanup completion
 491 * @up_completion:    connection establishment completed
 492 *                    (state is ISER_CONN_UP)
 493 * @conn_list:        entry in ig conn list
 494 * @login_buf:        login data buffer (stores login parameters)
 495 * @login_req_buf:    login request buffer
 496 * @login_req_dma:    login request buffer dma address
 497 * @login_resp_buf:   login response buffer
 498 * @login_resp_dma:   login response buffer dma address
 499 * @rx_desc_head:     head of rx_descs cyclic buffer
 500 * @rx_descs:         rx buffers array (cyclic buffer)
 501 * @num_rx_descs:     number of rx descriptors
 502 */
 503struct iser_conn {
 504        struct ib_conn               ib_conn;
 505        struct iscsi_conn            *iscsi_conn;
 506        struct iscsi_endpoint        *ep;
 507        enum iser_conn_state         state;
 508        unsigned                     qp_max_recv_dtos;
 509        unsigned                     qp_max_recv_dtos_mask;
 510        unsigned                     min_posted_rx;
 511        u16                          max_cmds;
 512        char                         name[ISER_OBJECT_NAME_SIZE];
 513        struct work_struct           release_work;
 514        struct mutex                 state_mutex;
 515        struct completion            stop_completion;
 516        struct completion            ib_completion;
 517        struct completion            up_completion;
 518        struct list_head             conn_list;
 519
 520        char                         *login_buf;
 521        char                         *login_req_buf, *login_resp_buf;
 522        u64                          login_req_dma, login_resp_dma;
 523        unsigned int                 rx_desc_head;
 524        struct iser_rx_desc          *rx_descs;
 525        u32                          num_rx_descs;
 526};
 527
 528/**
 529 * struct iscsi_iser_task - iser task context
 530 *
 531 * @desc:     TX descriptor
 532 * @iser_conn:        link to iser connection
 533 * @status:           current task status
 534 * @sc:               link to scsi command
 535 * @command_sent:     indicate if command was sent
 536 * @dir:              iser data direction
 537 * @rdma_regd:        task rdma registration desc
 538 * @data:             iser data buffer desc
 539 * @data_copy:        iser data copy buffer desc (bounce buffer)
 540 * @prot:             iser protection buffer desc
 541 * @prot_copy:        iser protection copy buffer desc (bounce buffer)
 542 */
 543struct iscsi_iser_task {
 544        struct iser_tx_desc          desc;
 545        struct iser_conn             *iser_conn;
 546        enum iser_task_status        status;
 547        struct scsi_cmnd             *sc;
 548        int                          command_sent;
 549        int                          dir[ISER_DIRS_NUM];
 550        struct iser_regd_buf         rdma_regd[ISER_DIRS_NUM];
 551        struct iser_data_buf         data[ISER_DIRS_NUM];
 552        struct iser_data_buf         data_copy[ISER_DIRS_NUM];
 553        struct iser_data_buf         prot[ISER_DIRS_NUM];
 554        struct iser_data_buf         prot_copy[ISER_DIRS_NUM];
 555};
 556
 557struct iser_page_vec {
 558        u64 *pages;
 559        int length;
 560        int offset;
 561        int data_size;
 562};
 563
 564/**
 565 * struct iser_global: iSER global context
 566 *
 567 * @device_list_mutex:    protects device_list
 568 * @device_list:          iser devices global list
 569 * @connlist_mutex:       protects connlist
 570 * @connlist:             iser connections global list
 571 * @desc_cache:           kmem cache for tx dataout
 572 */
 573struct iser_global {
 574        struct mutex      device_list_mutex;
 575        struct list_head  device_list;
 576        struct mutex      connlist_mutex;
 577        struct list_head  connlist;
 578        struct kmem_cache *desc_cache;
 579};
 580
 581extern struct iser_global ig;
 582extern int iser_debug_level;
 583extern bool iser_pi_enable;
 584extern int iser_pi_guard;
 585
 586int iser_send_control(struct iscsi_conn *conn,
 587                      struct iscsi_task *task);
 588
 589int iser_send_command(struct iscsi_conn *conn,
 590                      struct iscsi_task *task);
 591
 592int iser_send_data_out(struct iscsi_conn *conn,
 593                       struct iscsi_task *task,
 594                       struct iscsi_data *hdr);
 595
 596void iscsi_iser_recv(struct iscsi_conn *conn,
 597                     struct iscsi_hdr *hdr,
 598                     char *rx_data,
 599                     int rx_data_len);
 600
 601void iser_conn_init(struct iser_conn *iser_conn);
 602
 603void iser_conn_release(struct iser_conn *iser_conn);
 604
 605int iser_conn_terminate(struct iser_conn *iser_conn);
 606
 607void iser_release_work(struct work_struct *work);
 608
 609void iser_rcv_completion(struct iser_rx_desc *desc,
 610                         unsigned long dto_xfer_len,
 611                         struct ib_conn *ib_conn);
 612
 613void iser_snd_completion(struct iser_tx_desc *desc,
 614                         struct ib_conn *ib_conn);
 615
 616void iser_task_rdma_init(struct iscsi_iser_task *task);
 617
 618void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 619
 620void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 621
 622void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 623                                     struct iser_data_buf *mem,
 624                                     struct iser_data_buf *mem_copy,
 625                                     enum iser_data_dir cmd_dir);
 626
 627int  iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,
 628                           enum iser_data_dir cmd_dir);
 629int  iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
 630                               enum iser_data_dir cmd_dir);
 631
 632int  iser_connect(struct iser_conn *iser_conn,
 633                  struct sockaddr *src_addr,
 634                  struct sockaddr *dst_addr,
 635                  int non_blocking);
 636
 637int  iser_reg_page_vec(struct ib_conn *ib_conn,
 638                       struct iser_page_vec *page_vec,
 639                       struct iser_mem_reg *mem_reg);
 640
 641void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 642                        enum iser_data_dir cmd_dir);
 643void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 644                            enum iser_data_dir cmd_dir);
 645
 646int  iser_post_recvl(struct iser_conn *iser_conn);
 647int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 648int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 649                    bool signal);
 650
 651int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 652                           struct iser_data_buf *data,
 653                           enum iser_data_dir iser_dir,
 654                           enum dma_data_direction dma_dir);
 655
 656void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 657                              struct iser_data_buf *data);
 658int  iser_initialize_task_headers(struct iscsi_task *task,
 659                        struct iser_tx_desc *tx_desc);
 660int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 661                              struct iscsi_session *session);
 662int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max);
 663void iser_free_fmr_pool(struct ib_conn *ib_conn);
 664int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max);
 665void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 666u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 667                             enum iser_data_dir cmd_dir, sector_t *sector);
 668#endif
 669