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 #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/ib_fmr_pool.h>
  69 #include <rdma/rdma_cm.h>
  70
  71 #define DRV_NAME        "iser"
  72 #define PFX             DRV_NAME ": "
  73 #define DRV_VER         "1.6"
  74
  75 #define iser_dbg(fmt, arg...)                            \
  76         do {                                             \
  77                 if (unlikely(iser_debug_level > 2))      \
  78                         printk(KERN_DEBUG PFX "%s: " fmt,\
  79                                 __func__ , ## arg);      \
  80         } while (0)
  81
  82 #define iser_warn(fmt, arg...)                          \
  83         do {                                            \
  84                 if (unlikely(iser_debug_level > 0))     \
  85                         pr_warn(PFX "%s: " fmt,         \
  86                                 __func__ , ## arg);     \
  87         } while (0)
  88
  89 #define iser_info(fmt, arg...)                          \
  90         do {                                            \
  91                 if (unlikely(iser_debug_level > 1))     \
  92                         pr_info(PFX "%s: " fmt,         \
  93                                 __func__ , ## arg);     \
  94         } while (0)
  95
  96 #define iser_err(fmt, arg...) \
  97         pr_err(PFX "%s: " fmt, __func__ , ## arg)
  98
  99 #define SHIFT_4K        12
 100 #define SIZE_4K (1ULL << SHIFT_4K)
 101 #define MASK_4K (~(SIZE_4K-1))
 102
 103 /* Default support is 512KB I/O size */
 104 #define ISER_DEF_MAX_SECTORS            1024
 105 #define ISCSI_ISER_DEF_SG_TABLESIZE     ((ISER_DEF_MAX_SECTORS * 512) >> SHIFT_4K)
 106 /* Maximum support is 8MB I/O size */
 107 #define ISCSI_ISER_MAX_SG_TABLESIZE     ((16384 * 512) >> SHIFT_4K)
 108
 109 #define ISER_DEF_XMIT_CMDS_DEFAULT              512
 110 #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
 111         #define ISER_DEF_XMIT_CMDS_MAX          ISCSI_DEF_XMIT_CMDS_MAX
 112 #else
 113         #define ISER_DEF_XMIT_CMDS_MAX          ISER_DEF_XMIT_CMDS_DEFAULT
 114 #endif
 115 #define ISER_DEF_CMD_PER_LUN            ISER_DEF_XMIT_CMDS_MAX
 116
 117 /* QP settings */
 118 /* Maximal bounds on received asynchronous PDUs */
 119 #define ISER_MAX_RX_MISC_PDUS           4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
 120
 121 #define ISER_MAX_TX_MISC_PDUS           6 /* NOOP_OUT(2), TEXT(1),         *
 122                                            * SCSI_TMFUNC(2), LOGOUT(1) */
 123
 124 #define ISER_QP_MAX_RECV_DTOS           (ISER_DEF_XMIT_CMDS_MAX)
 125
 126 #define ISER_MIN_POSTED_RX              (ISER_DEF_XMIT_CMDS_MAX >> 2)
 127
 128 /* the max TX (send) WR supported by the iSER QP is defined by                 *
 129  * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 130  * to have at max for SCSI command. The tx posting & completion handling code  *
 131  * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 132  * send WR. D=8 comes from 64K/8K                                              */
 133
 134 #define ISER_INFLIGHT_DATAOUTS          8
 135
 136 #define ISER_QP_MAX_REQ_DTOS            (ISER_DEF_XMIT_CMDS_MAX *    \
 137                                         (1 + ISER_INFLIGHT_DATAOUTS) + \
 138                                         ISER_MAX_TX_MISC_PDUS        + \
 139                                         ISER_MAX_RX_MISC_PDUS)
 140
 141 /* Max registration work requests per command */
 142 #define ISER_MAX_REG_WR_PER_CMD         5
 143
 144 /* For Signature we don't support DATAOUTs so no need to make room for them */
 145 #define ISER_QP_SIG_MAX_REQ_DTOS        (ISER_DEF_XMIT_CMDS_MAX *       \
 146                                         (1 + ISER_MAX_REG_WR_PER_CMD) + \
 147                                         ISER_MAX_TX_MISC_PDUS         + \
 148                                         ISER_MAX_RX_MISC_PDUS)
 149
 150 #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr                       \
 151                                          - ISER_MAX_TX_MISC_PDUS        \
 152                                          - ISER_MAX_RX_MISC_PDUS) /     \
 153                                          (1 + ISER_INFLIGHT_DATAOUTS))
 154
 155 #define ISER_SIGNAL_CMD_COUNT 32
 156
 157 /* Constant PDU lengths calculations */
 158 #define ISER_HEADERS_LEN        (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
 159
 160 #define ISER_RECV_DATA_SEG_LEN  128
 161 #define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 162 #define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 163
 164 /* Length of an object name string */
 165 #define ISER_OBJECT_NAME_SIZE               64
 166
 167 enum iser_conn_state {
 168         ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 169         ISER_CONN_PENDING,         /* in the process of being established */
 170         ISER_CONN_UP,              /* up and running                      */
 171         ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 172         ISER_CONN_DOWN,            /* shut down                           */
 173         ISER_CONN_STATES_NUM
 174 };
 175
 176 enum iser_task_status {
 177         ISER_TASK_STATUS_INIT = 0,
 178         ISER_TASK_STATUS_STARTED,
 179         ISER_TASK_STATUS_COMPLETED
 180 };
 181
 182 enum iser_data_dir {
 183         ISER_DIR_IN = 0,           /* to initiator */
 184         ISER_DIR_OUT,              /* from initiator */
 185         ISER_DIRS_NUM
 186 };
 187
 188 /**
 189  * struct iser_data_buf - iSER data buffer
 190  *
 191  * @sg:           pointer to the sg list
 192  * @size:         num entries of this sg
 193  * @data_len:     total beffer byte len
 194  * @dma_nents:    returned by dma_map_sg
 195  */
 196 struct iser_data_buf {
 197         struct scatterlist *sg;
 198         int                size;
 199         unsigned long      data_len;
 200         unsigned int       dma_nents;
 201 };
 202
 203 /* fwd declarations */
 204 struct iser_device;
 205 struct iscsi_iser_task;
 206 struct iscsi_endpoint;
 207 struct iser_reg_resources;
 208
 209 /**
 210  * struct iser_mem_reg - iSER memory registration info
 211  *
 212  * @sge:          memory region sg element
 213  * @rkey:         memory region remote key
 214  * @mem_h:        pointer to registration context (FMR/Fastreg)
 215  */
 216 struct iser_mem_reg {
 217         struct ib_sge    sge;
 218         u32              rkey;
 219         void            *mem_h;
 220 };
 221
 222 enum iser_desc_type {
 223         ISCSI_TX_CONTROL ,
 224         ISCSI_TX_SCSI_COMMAND,
 225         ISCSI_TX_DATAOUT
 226 };
 227
 228 /* Maximum number of work requests per task:
 229  * Data memory region local invalidate + fast registration
 230  * Protection memory region local invalidate + fast registration
 231  * Signature memory region local invalidate + fast registration
 232  * PDU send
 233  */
 234 #define ISER_MAX_WRS 7
 235
 236 /**
 237  * struct iser_tx_desc - iSER TX descriptor
 238  *
 239  * @iser_header:   iser header
 240  * @iscsi_header:  iscsi header
 241  * @type:          command/control/dataout
 242  * @dam_addr:      header buffer dma_address
 243  * @tx_sg:         sg[0] points to iser/iscsi headers
 244  *                 sg[1] optionally points to either of immediate data
 245  *                 unsolicited data-out or control
 246  * @num_sge:       number sges used on this TX task
 247  * @mapped:        Is the task header mapped
 248  * @wr_idx:        Current WR index
 249  * @wrs:           Array of WRs per task
 250  * @data_reg:      Data buffer registration details
 251  * @prot_reg:      Protection buffer registration details
 252  * @sig_attrs:     Signature attributes
 253  */
 254 struct iser_tx_desc {
 255         struct iser_ctrl             iser_header;
 256         struct iscsi_hdr             iscsi_header;
 257         enum   iser_desc_type        type;
 258         u64                          dma_addr;
 259         struct ib_sge                tx_sg[2];
 260         int                          num_sge;
 261         struct ib_cqe                cqe;
 262         bool                         mapped;
 263         u8                           wr_idx;
 264         union iser_wr {
 265                 struct ib_send_wr               send;
 266                 struct ib_reg_wr                fast_reg;
 267                 struct ib_sig_handover_wr       sig;
 268         } wrs[ISER_MAX_WRS];
 269         struct iser_mem_reg          data_reg;
 270         struct iser_mem_reg          prot_reg;
 271         struct ib_sig_attrs          sig_attrs;
 272 };
 273
 274 #define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 275                                  sizeof(u64) + sizeof(struct ib_sge) + \
 276                                  sizeof(struct ib_cqe)))
 277 /**
 278  * struct iser_rx_desc - iSER RX descriptor
 279  *
 280  * @iser_header:   iser header
 281  * @iscsi_header:  iscsi header
 282  * @data:          received data segment
 283  * @dma_addr:      receive buffer dma address
 284  * @rx_sg:         ib_sge of receive buffer
 285  * @pad:           for sense data TODO: Modify to maximum sense length supported
 286  */
 287 struct iser_rx_desc {
 288         struct iser_ctrl             iser_header;
 289         struct iscsi_hdr             iscsi_header;
 290         char                         data[ISER_RECV_DATA_SEG_LEN];
 291         u64                          dma_addr;
 292         struct ib_sge                rx_sg;
 293         struct ib_cqe                cqe;
 294         char                         pad[ISER_RX_PAD_SIZE];
 295 } __packed;
 296
 297 /**
 298  * struct iser_login_desc - iSER login descriptor
 299  *
 300  * @req:           pointer to login request buffer
 301  * @resp:          pointer to login response buffer
 302  * @req_dma:       DMA address of login request buffer
 303  * @rsp_dma:      DMA address of login response buffer
 304  * @sge:           IB sge for login post recv
 305  * @cqe:           completion handler
 306  */
 307 struct iser_login_desc {
 308         void                         *req;
 309         void                         *rsp;
 310         u64                          req_dma;
 311         u64                          rsp_dma;
 312         struct ib_sge                sge;
 313         struct ib_cqe                cqe;
 314 } __attribute__((packed));
 315
 316 struct iser_conn;
 317 struct ib_conn;
 318 struct iscsi_iser_task;
 319
 320 /**
 321  * struct iser_comp - iSER completion context
 322  *
 323  * @cq:         completion queue
 324  * @active_qps: Number of active QPs attached
 325  *              to completion context
 326  */
 327 struct iser_comp {
 328         struct ib_cq            *cq;
 329         int                      active_qps;
 330 };
 331
 332 /**
 333  * struct iser_device - Memory registration operations
 334  *     per-device registration schemes
 335  *
 336  * @alloc_reg_res:     Allocate registration resources
 337  * @free_reg_res:      Free registration resources
 338  * @fast_reg_mem:      Register memory buffers
 339  * @unreg_mem:         Un-register memory buffers
 340  * @reg_desc_get:      Get a registration descriptor for pool
 341  * @reg_desc_put:      Get a registration descriptor to pool
 342  */
 343 struct iser_reg_ops {
 344         int            (*alloc_reg_res)(struct ib_conn *ib_conn,
 345                                         unsigned cmds_max,
 346                                         unsigned int size);
 347         void           (*free_reg_res)(struct ib_conn *ib_conn);
 348         int            (*reg_mem)(struct iscsi_iser_task *iser_task,
 349                                   struct iser_data_buf *mem,
 350                                   struct iser_reg_resources *rsc,
 351                                   struct iser_mem_reg *reg);
 352         void           (*unreg_mem)(struct iscsi_iser_task *iser_task,
 353                                     enum iser_data_dir cmd_dir);
 354         struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
 355         void           (*reg_desc_put)(struct ib_conn *ib_conn,
 356                                        struct iser_fr_desc *desc);
 357 };
 358
 359 /**
 360  * struct iser_device - iSER device handle
 361  *
 362  * @ib_device:     RDMA device
 363  * @pd:            Protection Domain for this device
 364  * @mr:            Global DMA memory region
 365  * @event_handler: IB events handle routine
 366  * @ig_list:       entry in devices list
 367  * @refcount:      Reference counter, dominated by open iser connections
 368  * @comps_used:    Number of completion contexts used, Min between online
 369  *                 cpus and device max completion vectors
 370  * @comps:         Dinamically allocated array of completion handlers
 371  * @reg_ops:       Registration ops
 372  * @remote_inv_sup: Remote invalidate is supported on this device
 373  */
 374 struct iser_device {
 375         struct ib_device             *ib_device;
 376         struct ib_pd                 *pd;
 377         struct ib_event_handler      event_handler;
 378         struct list_head             ig_list;
 379         int                          refcount;
 380         int                          comps_used;
 381         struct iser_comp             *comps;
 382         const struct iser_reg_ops    *reg_ops;
 383         bool                         remote_inv_sup;
 384 };
 385
 386 #define ISER_CHECK_GUARD        0xc0
 387 #define ISER_CHECK_REFTAG       0x0f
 388 #define ISER_CHECK_APPTAG       0x30
 389
 390 /**
 391  * struct iser_reg_resources - Fast registration recources
 392  *
 393  * @mr:         memory region
 394  * @fmr_pool:   pool of fmrs
 395  * @page_vec:   fast reg page list used by fmr pool
 396  * @mr_valid:   is mr valid indicator
 397  */
 398 struct iser_reg_resources {
 399         union {
 400                 struct ib_mr             *mr;
 401                 struct ib_fmr_pool       *fmr_pool;
 402         };
 403         struct iser_page_vec             *page_vec;
 404         u8                                mr_valid:1;
 405 };
 406
 407 /**
 408  * struct iser_pi_context - Protection information context
 409  *
 410  * @rsc:             protection buffer registration resources
 411  * @sig_mr:          signature enable memory region
 412  * @sig_mr_valid:    is sig_mr valid indicator
 413  * @sig_protected:   is region protected indicator
 414  */
 415 struct iser_pi_context {
 416         struct iser_reg_resources       rsc;
 417         struct ib_mr                   *sig_mr;
 418         u8                              sig_mr_valid:1;
 419         u8                              sig_protected:1;
 420 };
 421
 422 /**
 423  * struct iser_fr_desc - Fast registration descriptor
 424  *
 425  * @list:           entry in connection fastreg pool
 426  * @rsc:            data buffer registration resources
 427  * @pi_ctx:         protection information context
 428  */
 429 struct iser_fr_desc {
 430         struct list_head                  list;
 431         struct iser_reg_resources         rsc;
 432         struct iser_pi_context           *pi_ctx;
 433         struct list_head                  all_list;
 434 };
 435
 436 /**
 437  * struct iser_fr_pool: connection fast registration pool
 438  *
 439  * @list:                list of fastreg descriptors
 440  * @lock:                protects fmr/fastreg pool
 441  * @size:                size of the pool
 442  */
 443 struct iser_fr_pool {
 444         struct list_head        list;
 445         spinlock_t              lock;
 446         int                     size;
 447         struct list_head        all_list;
 448 };
 449
 450 /**
 451  * struct ib_conn - Infiniband related objects
 452  *
 453  * @cma_id:              rdma_cm connection maneger handle
 454  * @qp:                  Connection Queue-pair
 455  * @post_recv_buf_count: post receive counter
 456  * @sig_count:           send work request signal count
 457  * @rx_wr:               receive work request for batch posts
 458  * @device:              reference to iser device
 459  * @comp:                iser completion context
 460  * @fr_pool:             connection fast registration poool
 461  * @pi_support:          Indicate device T10-PI support
 462  */
 463 struct ib_conn {
 464         struct rdma_cm_id           *cma_id;
 465         struct ib_qp                *qp;
 466         int                          post_recv_buf_count;
 467         u8                           sig_count;
 468         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 469         struct iser_device          *device;
 470         struct iser_comp            *comp;
 471         struct iser_fr_pool          fr_pool;
 472         bool                         pi_support;
 473         struct ib_cqe                reg_cqe;
 474 };
 475
 476 /**
 477  * struct iser_conn - iSER connection context
 478  *
 479  * @ib_conn:          connection RDMA resources
 480  * @iscsi_conn:       link to matching iscsi connection
 481  * @ep:               transport handle
 482  * @state:            connection logical state
 483  * @qp_max_recv_dtos: maximum number of data outs, corresponds
 484  *                    to max number of post recvs
 485  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 486  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 487  * @max_cmds:         maximum cmds allowed for this connection
 488  * @name:             connection peer portal
 489  * @release_work:     deffered work for release job
 490  * @state_mutex:      protects iser onnection state
 491  * @stop_completion:  conn_stop completion
 492  * @ib_completion:    RDMA cleanup completion
 493  * @up_completion:    connection establishment completed
 494  *                    (state is ISER_CONN_UP)
 495  * @conn_list:        entry in ig conn list
 496  * @login_desc:       login descriptor
 497  * @rx_desc_head:     head of rx_descs cyclic buffer
 498  * @rx_descs:         rx buffers array (cyclic buffer)
 499  * @num_rx_descs:     number of rx descriptors
 500  * @scsi_sg_tablesize: scsi host sg_tablesize
 501  */
 502 struct iser_conn {
 503         struct ib_conn               ib_conn;
 504         struct iscsi_conn            *iscsi_conn;
 505         struct iscsi_endpoint        *ep;
 506         enum iser_conn_state         state;
 507         unsigned                     qp_max_recv_dtos;
 508         unsigned                     qp_max_recv_dtos_mask;
 509         unsigned                     min_posted_rx;
 510         u16                          max_cmds;
 511         char                         name[ISER_OBJECT_NAME_SIZE];
 512         struct work_struct           release_work;
 513         struct mutex                 state_mutex;
 514         struct completion            stop_completion;
 515         struct completion            ib_completion;
 516         struct completion            up_completion;
 517         struct list_head             conn_list;
 518         struct iser_login_desc       login_desc;
 519         unsigned int                 rx_desc_head;
 520         struct iser_rx_desc          *rx_descs;
 521         u32                          num_rx_descs;
 522         unsigned short               scsi_sg_tablesize;
 523         bool                         snd_w_inv;
 524 };
 525
 526 /**
 527  * struct iscsi_iser_task - iser task context
 528  *
 529  * @desc:     TX descriptor
 530  * @iser_conn:        link to iser connection
 531  * @status:           current task status
 532  * @sc:               link to scsi command
 533  * @command_sent:     indicate if command was sent
 534  * @dir:              iser data direction
 535  * @rdma_reg:         task rdma registration desc
 536  * @data:             iser data buffer desc
 537  * @prot:             iser protection buffer desc
 538  */
 539 struct iscsi_iser_task {
 540         struct iser_tx_desc          desc;
 541         struct iser_conn             *iser_conn;
 542         enum iser_task_status        status;
 543         struct scsi_cmnd             *sc;
 544         int                          command_sent;
 545         int                          dir[ISER_DIRS_NUM];
 546         struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 547         struct iser_data_buf         data[ISER_DIRS_NUM];
 548         struct iser_data_buf         prot[ISER_DIRS_NUM];
 549 };
 550
 551 struct iser_page_vec {
 552         u64 *pages;
 553         int npages;
 554         struct ib_mr fake_mr;
 555 };
 556
 557 /**
 558  * struct iser_global: iSER global context
 559  *
 560  * @device_list_mutex:    protects device_list
 561  * @device_list:          iser devices global list
 562  * @connlist_mutex:       protects connlist
 563  * @connlist:             iser connections global list
 564  * @desc_cache:           kmem cache for tx dataout
 565  */
 566 struct iser_global {
 567         struct mutex      device_list_mutex;
 568         struct list_head  device_list;
 569         struct mutex      connlist_mutex;
 570         struct list_head  connlist;
 571         struct kmem_cache *desc_cache;
 572 };
 573
 574 extern struct iser_global ig;
 575 extern int iser_debug_level;
 576 extern bool iser_pi_enable;
 577 extern int iser_pi_guard;
 578 extern unsigned int iser_max_sectors;
 579 extern bool iser_always_reg;
 580
 581 int iser_assign_reg_ops(struct iser_device *device);
 582
 583 int iser_send_control(struct iscsi_conn *conn,
 584                       struct iscsi_task *task);
 585
 586 int iser_send_command(struct iscsi_conn *conn,
 587                       struct iscsi_task *task);
 588
 589 int iser_send_data_out(struct iscsi_conn *conn,
 590                        struct iscsi_task *task,
 591                        struct iscsi_data *hdr);
 592
 593 void iscsi_iser_recv(struct iscsi_conn *conn,
 594                      struct iscsi_hdr *hdr,
 595                      char *rx_data,
 596                      int rx_data_len);
 597
 598 void iser_conn_init(struct iser_conn *iser_conn);
 599
 600 void iser_conn_release(struct iser_conn *iser_conn);
 601
 602 int iser_conn_terminate(struct iser_conn *iser_conn);
 603
 604 void iser_release_work(struct work_struct *work);
 605
 606 void iser_err_comp(struct ib_wc *wc, const char *type);
 607 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
 608 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
 609 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
 610 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
 611 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
 612 void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
 613
 614 void iser_task_rdma_init(struct iscsi_iser_task *task);
 615
 616 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 617
 618 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 619
 620 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 621                                      struct iser_data_buf *mem,
 622                                      enum iser_data_dir cmd_dir);
 623
 624 int iser_reg_rdma_mem(struct iscsi_iser_task *task,
 625                       enum iser_data_dir dir,
 626                       bool all_imm);
 627 void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
 628                          enum iser_data_dir dir);
 629
 630 int  iser_connect(struct iser_conn *iser_conn,
 631                   struct sockaddr *src_addr,
 632                   struct sockaddr *dst_addr,
 633                   int non_blocking);
 634
 635 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 636                         enum iser_data_dir cmd_dir);
 637 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 638                             enum iser_data_dir cmd_dir);
 639
 640 int  iser_post_recvl(struct iser_conn *iser_conn);
 641 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 642 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 643                     bool signal);
 644
 645 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 646                            struct iser_data_buf *data,
 647                            enum iser_data_dir iser_dir,
 648                            enum dma_data_direction dma_dir);
 649
 650 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 651                               struct iser_data_buf *data,
 652                               enum dma_data_direction dir);
 653
 654 int  iser_initialize_task_headers(struct iscsi_task *task,
 655                         struct iser_tx_desc *tx_desc);
 656 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 657                               struct iscsi_session *session);
 658 int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
 659                         unsigned cmds_max,
 660                         unsigned int size);
 661 void iser_free_fmr_pool(struct ib_conn *ib_conn);
 662 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
 663                             unsigned cmds_max,
 664                             unsigned int size);
 665 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 666 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 667                              enum iser_data_dir cmd_dir, sector_t *sector);
 668 struct iser_fr_desc *
 669 iser_reg_desc_get_fr(struct ib_conn *ib_conn);
 670 void
 671 iser_reg_desc_put_fr(struct ib_conn *ib_conn,
 672                      struct iser_fr_desc *desc);
 673 struct iser_fr_desc *
 674 iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
 675 void
 676 iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
 677                       struct iser_fr_desc *desc);
 678
 679 static inline struct ib_send_wr *
 680 iser_tx_next_wr(struct iser_tx_desc *tx_desc)
 681 {
 682         struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send;
 683         struct ib_send_wr *last_wr;
 684
 685         if (tx_desc->wr_idx) {
 686                 last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send;
 687                 last_wr->next = cur_wr;
 688         }
 689         tx_desc->wr_idx++;
 690
 691         return cur_wr;
 692 }
 693
 694 static inline struct iser_conn *
 695 to_iser_conn(struct ib_conn *ib_conn)
 696 {
 697         return container_of(ib_conn, struct iser_conn, ib_conn);
 698 }
 699
 700 static inline struct iser_rx_desc *
 701 iser_rx(struct ib_cqe *cqe)
 702 {
 703         return container_of(cqe, struct iser_rx_desc, cqe);
 704 }
 705
 706 static inline struct iser_tx_desc *
 707 iser_tx(struct ib_cqe *cqe)
 708 {
 709         return container_of(cqe, struct iser_tx_desc, cqe);
 710 }
 711
 712 static inline struct iser_login_desc *
 713 iser_login(struct ib_cqe *cqe)
 714 {
 715         return container_of(cqe, struct iser_login_desc, cqe);
 716 }
 717
 718 #endif