drivers/infiniband/ulp/iser/iscsi_iser.h

   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         "1.6"
  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 #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  */
 169 struct 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
 182 struct 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
 197 enum 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
 206 enum iser_task_status {
 207         ISER_TASK_STATUS_INIT = 0,
 208         ISER_TASK_STATUS_STARTED,
 209         ISER_TASK_STATUS_COMPLETED
 210 };
 211
 212 enum 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  * @sg:           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  * @orig_sg:      pointer to the original sg list (in case
 226  *                we used a copy)
 227  * @orig_size:    num entris of orig sg list
 228  */
 229 struct iser_data_buf {
 230         struct scatterlist *sg;
 231         unsigned int       size;
 232         unsigned long      data_len;
 233         unsigned int       dma_nents;
 234         struct scatterlist *orig_sg;
 235         unsigned int       orig_size;
 236   };
 237
 238 /* fwd declarations */
 239 struct iser_device;
 240 struct iscsi_iser_task;
 241 struct iscsi_endpoint;
 242
 243 /**
 244  * struct iser_mem_reg - iSER memory registration info
 245  *
 246  * @sge:          memory region sg element
 247  * @rkey:         memory region remote key
 248  * @mem_h:        pointer to registration context (FMR/Fastreg)
 249  */
 250 struct iser_mem_reg {
 251         struct ib_sge    sge;
 252         u32              rkey;
 253         void            *mem_h;
 254 };
 255
 256 enum iser_desc_type {
 257         ISCSI_TX_CONTROL ,
 258         ISCSI_TX_SCSI_COMMAND,
 259         ISCSI_TX_DATAOUT
 260 };
 261
 262 /**
 263  * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
 264  *
 265  * @iser_header:   iser header
 266  * @iscsi_header:  iscsi header
 267  * @type:          command/control/dataout
 268  * @dam_addr:      header buffer dma_address
 269  * @tx_sg:         sg[0] points to iser/iscsi headers
 270  *                 sg[1] optionally points to either of immediate data
 271  *                 unsolicited data-out or control
 272  * @num_sge:       number sges used on this TX task
 273  * @mapped:        Is the task header mapped
 274  */
 275 struct iser_tx_desc {
 276         struct iser_hdr              iser_header;
 277         struct iscsi_hdr             iscsi_header;
 278         enum   iser_desc_type        type;
 279         u64                          dma_addr;
 280         struct ib_sge                tx_sg[2];
 281         int                          num_sge;
 282         bool                         mapped;
 283 };
 284
 285 #define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 286                                         sizeof(u64) + sizeof(struct ib_sge)))
 287 /**
 288  * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
 289  *
 290  * @iser_header:   iser header
 291  * @iscsi_header:  iscsi header
 292  * @data:          received data segment
 293  * @dma_addr:      receive buffer dma address
 294  * @rx_sg:         ib_sge of receive buffer
 295  * @pad:           for sense data TODO: Modify to maximum sense length supported
 296  */
 297 struct iser_rx_desc {
 298         struct iser_hdr              iser_header;
 299         struct iscsi_hdr             iscsi_header;
 300         char                         data[ISER_RECV_DATA_SEG_LEN];
 301         u64                          dma_addr;
 302         struct ib_sge                rx_sg;
 303         char                         pad[ISER_RX_PAD_SIZE];
 304 } __attribute__((packed));
 305
 306 struct iser_conn;
 307 struct ib_conn;
 308 struct iscsi_iser_task;
 309
 310 /**
 311  * struct iser_comp - iSER completion context
 312  *
 313  * @device:     pointer to device handle
 314  * @cq:         completion queue
 315  * @wcs:        work completion array
 316  * @tasklet:    Tasklet handle
 317  * @active_qps: Number of active QPs attached
 318  *              to completion context
 319  */
 320 struct iser_comp {
 321         struct iser_device      *device;
 322         struct ib_cq            *cq;
 323         struct ib_wc             wcs[ISER_WC_BATCH_COUNT];
 324         struct tasklet_struct    tasklet;
 325         int                      active_qps;
 326 };
 327
 328 /**
 329  * struct iser_device - Memory registration operations
 330  *     per-device registration schemes
 331  *
 332  * @alloc_reg_res:     Allocate registration resources
 333  * @free_reg_res:      Free registration resources
 334  * @reg_rdma_mem:      Register memory buffers
 335  * @unreg_rdma_mem:    Un-register memory buffers
 336  */
 337 struct iser_reg_ops {
 338         int            (*alloc_reg_res)(struct ib_conn *ib_conn,
 339                                         unsigned cmds_max);
 340         void           (*free_reg_res)(struct ib_conn *ib_conn);
 341         int            (*reg_rdma_mem)(struct iscsi_iser_task *iser_task,
 342                                        enum iser_data_dir cmd_dir);
 343         void           (*unreg_rdma_mem)(struct iscsi_iser_task *iser_task,
 344                                          enum iser_data_dir cmd_dir);
 345 };
 346
 347 /**
 348  * struct iser_device - iSER device handle
 349  *
 350  * @ib_device:     RDMA device
 351  * @pd:            Protection Domain for this device
 352  * @dev_attr:      Device attributes container
 353  * @mr:            Global DMA memory region
 354  * @event_handler: IB events handle routine
 355  * @ig_list:       entry in devices list
 356  * @refcount:      Reference counter, dominated by open iser connections
 357  * @comps_used:    Number of completion contexts used, Min between online
 358  *                 cpus and device max completion vectors
 359  * @comps:         Dinamically allocated array of completion handlers
 360  * @reg_ops:       Registration ops
 361  */
 362 struct iser_device {
 363         struct ib_device             *ib_device;
 364         struct ib_pd                 *pd;
 365         struct ib_device_attr        dev_attr;
 366         struct ib_mr                 *mr;
 367         struct ib_event_handler      event_handler;
 368         struct list_head             ig_list;
 369         int                          refcount;
 370         int                          comps_used;
 371         struct iser_comp             *comps;
 372         struct iser_reg_ops          *reg_ops;
 373 };
 374
 375 #define ISER_CHECK_GUARD        0xc0
 376 #define ISER_CHECK_REFTAG       0x0f
 377 #define ISER_CHECK_APPTAG       0x30
 378
 379 /**
 380  * struct iser_reg_resources - Fast registration recources
 381  *
 382  * @mr:         memory region
 383  * @frpl:       fast reg page list
 384  * @mr_valid:   is mr valid indicator
 385  */
 386 struct iser_reg_resources {
 387         struct ib_mr                     *mr;
 388         struct ib_fast_reg_page_list     *frpl;
 389         u8                                mr_valid:1;
 390 };
 391
 392 /**
 393  * struct iser_pi_context - Protection information context
 394  *
 395  * @rsc:             protection buffer registration resources
 396  * @sig_mr:          signature enable memory region
 397  * @sig_mr_valid:    is sig_mr valid indicator
 398  * @sig_protected:   is region protected indicator
 399  */
 400 struct iser_pi_context {
 401         struct iser_reg_resources       rsc;
 402         struct ib_mr                   *sig_mr;
 403         u8                              sig_mr_valid:1;
 404         u8                              sig_protected:1;
 405 };
 406
 407 /**
 408  * struct iser_fr_desc - Fast registration descriptor
 409  *
 410  * @list:           entry in connection fastreg pool
 411  * @rsc:            data buffer registration resources
 412  * @pi_ctx:         protection information context
 413  */
 414 struct iser_fr_desc {
 415         struct list_head                  list;
 416         struct iser_reg_resources         rsc;
 417         struct iser_pi_context           *pi_ctx;
 418 };
 419
 420 /**
 421  * struct ib_conn - Infiniband related objects
 422  *
 423  * @cma_id:              rdma_cm connection maneger handle
 424  * @qp:                  Connection Queue-pair
 425  * @post_recv_buf_count: post receive counter
 426  * @sig_count:           send work request signal count
 427  * @rx_wr:               receive work request for batch posts
 428  * @device:              reference to iser device
 429  * @comp:                iser completion context
 430  * @pi_support:          Indicate device T10-PI support
 431  * @beacon:              beacon send wr to signal all flush errors were drained
 432  * @flush_comp:          completes when all connection completions consumed
 433  * @lock:                protects fmr/fastreg pool
 434  * @union.fmr:
 435  *     @pool:            FMR pool for fast registrations
 436  *     @page_vec:        page vector to hold mapped commands pages
 437  *                       used for registration
 438  * @union.fastreg:
 439  *     @pool:            Fast registration descriptors pool for fast
 440  *                       registrations
 441  *     @pool_size:       Size of pool
 442  */
 443 struct ib_conn {
 444         struct rdma_cm_id           *cma_id;
 445         struct ib_qp                *qp;
 446         int                          post_recv_buf_count;
 447         u8                           sig_count;
 448         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 449         struct iser_device          *device;
 450         struct iser_comp            *comp;
 451         bool                         pi_support;
 452         struct ib_send_wr            beacon;
 453         struct completion            flush_comp;
 454         spinlock_t                   lock;
 455         union {
 456                 struct {
 457                         struct ib_fmr_pool      *pool;
 458                         struct iser_page_vec    *page_vec;
 459                 } fmr;
 460                 struct {
 461                         struct list_head         pool;
 462                         int                      pool_size;
 463                 } fastreg;
 464         };
 465 };
 466
 467 /**
 468  * struct iser_conn - iSER connection context
 469  *
 470  * @ib_conn:          connection RDMA resources
 471  * @iscsi_conn:       link to matching iscsi connection
 472  * @ep:               transport handle
 473  * @state:            connection logical state
 474  * @qp_max_recv_dtos: maximum number of data outs, corresponds
 475  *                    to max number of post recvs
 476  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 477  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 478  * @max_cmds:         maximum cmds allowed for this connection
 479  * @name:             connection peer portal
 480  * @release_work:     deffered work for release job
 481  * @state_mutex:      protects iser onnection state
 482  * @stop_completion:  conn_stop completion
 483  * @ib_completion:    RDMA cleanup completion
 484  * @up_completion:    connection establishment completed
 485  *                    (state is ISER_CONN_UP)
 486  * @conn_list:        entry in ig conn list
 487  * @login_buf:        login data buffer (stores login parameters)
 488  * @login_req_buf:    login request buffer
 489  * @login_req_dma:    login request buffer dma address
 490  * @login_resp_buf:   login response buffer
 491  * @login_resp_dma:   login response buffer dma address
 492  * @rx_desc_head:     head of rx_descs cyclic buffer
 493  * @rx_descs:         rx buffers array (cyclic buffer)
 494  * @num_rx_descs:     number of rx descriptors
 495  */
 496 struct iser_conn {
 497         struct ib_conn               ib_conn;
 498         struct iscsi_conn            *iscsi_conn;
 499         struct iscsi_endpoint        *ep;
 500         enum iser_conn_state         state;
 501         unsigned                     qp_max_recv_dtos;
 502         unsigned                     qp_max_recv_dtos_mask;
 503         unsigned                     min_posted_rx;
 504         u16                          max_cmds;
 505         char                         name[ISER_OBJECT_NAME_SIZE];
 506         struct work_struct           release_work;
 507         struct mutex                 state_mutex;
 508         struct completion            stop_completion;
 509         struct completion            ib_completion;
 510         struct completion            up_completion;
 511         struct list_head             conn_list;
 512
 513         char                         *login_buf;
 514         char                         *login_req_buf, *login_resp_buf;
 515         u64                          login_req_dma, login_resp_dma;
 516         unsigned int                 rx_desc_head;
 517         struct iser_rx_desc          *rx_descs;
 518         u32                          num_rx_descs;
 519 };
 520
 521 /**
 522  * struct iscsi_iser_task - iser task context
 523  *
 524  * @desc:     TX descriptor
 525  * @iser_conn:        link to iser connection
 526  * @status:           current task status
 527  * @sc:               link to scsi command
 528  * @command_sent:     indicate if command was sent
 529  * @dir:              iser data direction
 530  * @rdma_reg:         task rdma registration desc
 531  * @data:             iser data buffer desc
 532  * @prot:             iser protection buffer desc
 533  */
 534 struct iscsi_iser_task {
 535         struct iser_tx_desc          desc;
 536         struct iser_conn             *iser_conn;
 537         enum iser_task_status        status;
 538         struct scsi_cmnd             *sc;
 539         int                          command_sent;
 540         int                          dir[ISER_DIRS_NUM];
 541         struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 542         struct iser_data_buf         data[ISER_DIRS_NUM];
 543         struct iser_data_buf         prot[ISER_DIRS_NUM];
 544 };
 545
 546 struct iser_page_vec {
 547         u64 *pages;
 548         int length;
 549         int offset;
 550         int data_size;
 551 };
 552
 553 /**
 554  * struct iser_global: iSER global context
 555  *
 556  * @device_list_mutex:    protects device_list
 557  * @device_list:          iser devices global list
 558  * @connlist_mutex:       protects connlist
 559  * @connlist:             iser connections global list
 560  * @desc_cache:           kmem cache for tx dataout
 561  */
 562 struct iser_global {
 563         struct mutex      device_list_mutex;
 564         struct list_head  device_list;
 565         struct mutex      connlist_mutex;
 566         struct list_head  connlist;
 567         struct kmem_cache *desc_cache;
 568 };
 569
 570 extern struct iser_global ig;
 571 extern int iser_debug_level;
 572 extern bool iser_pi_enable;
 573 extern int iser_pi_guard;
 574
 575 int iser_assign_reg_ops(struct iser_device *device);
 576
 577 int iser_send_control(struct iscsi_conn *conn,
 578                       struct iscsi_task *task);
 579
 580 int iser_send_command(struct iscsi_conn *conn,
 581                       struct iscsi_task *task);
 582
 583 int iser_send_data_out(struct iscsi_conn *conn,
 584                        struct iscsi_task *task,
 585                        struct iscsi_data *hdr);
 586
 587 void iscsi_iser_recv(struct iscsi_conn *conn,
 588                      struct iscsi_hdr *hdr,
 589                      char *rx_data,
 590                      int rx_data_len);
 591
 592 void iser_conn_init(struct iser_conn *iser_conn);
 593
 594 void iser_conn_release(struct iser_conn *iser_conn);
 595
 596 int iser_conn_terminate(struct iser_conn *iser_conn);
 597
 598 void iser_release_work(struct work_struct *work);
 599
 600 void iser_rcv_completion(struct iser_rx_desc *desc,
 601                          unsigned long dto_xfer_len,
 602                          struct ib_conn *ib_conn);
 603
 604 void iser_snd_completion(struct iser_tx_desc *desc,
 605                          struct ib_conn *ib_conn);
 606
 607 void iser_task_rdma_init(struct iscsi_iser_task *task);
 608
 609 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 610
 611 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 612
 613 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 614                                      struct iser_data_buf *mem,
 615                                      enum iser_data_dir cmd_dir);
 616
 617 int  iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,
 618                            enum iser_data_dir cmd_dir);
 619 int  iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
 620                                enum iser_data_dir cmd_dir);
 621
 622 int  iser_connect(struct iser_conn *iser_conn,
 623                   struct sockaddr *src_addr,
 624                   struct sockaddr *dst_addr,
 625                   int non_blocking);
 626
 627 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 628                         enum iser_data_dir cmd_dir);
 629 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 630                             enum iser_data_dir cmd_dir);
 631
 632 int  iser_post_recvl(struct iser_conn *iser_conn);
 633 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 634 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 635                     bool signal);
 636
 637 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 638                            struct iser_data_buf *data,
 639                            enum iser_data_dir iser_dir,
 640                            enum dma_data_direction dma_dir);
 641
 642 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 643                               struct iser_data_buf *data,
 644                               enum dma_data_direction dir);
 645
 646 int  iser_initialize_task_headers(struct iscsi_task *task,
 647                         struct iser_tx_desc *tx_desc);
 648 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 649                               struct iscsi_session *session);
 650 int iser_alloc_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max);
 651 void iser_free_fmr_pool(struct ib_conn *ib_conn);
 652 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max);
 653 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 654 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 655                              enum iser_data_dir cmd_dir, sector_t *sector);
 656 struct iser_fr_desc *
 657 iser_reg_desc_get(struct ib_conn *ib_conn);
 658 void
 659 iser_reg_desc_put(struct ib_conn *ib_conn,
 660                   struct iser_fr_desc *desc);
 661 #endif