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 /* Default support is 512KB I/O size */
 100 #define ISER_DEF_MAX_SECTORS            1024
 101 #define ISCSI_ISER_DEF_SG_TABLESIZE                                            \
 102         ((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K))
 103 /* Maximum support is 16MB I/O size */
 104 #define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K))
 105
 106 #define ISER_DEF_XMIT_CMDS_DEFAULT              512
 107 #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
 108         #define ISER_DEF_XMIT_CMDS_MAX          ISCSI_DEF_XMIT_CMDS_MAX
 109 #else
 110         #define ISER_DEF_XMIT_CMDS_MAX          ISER_DEF_XMIT_CMDS_DEFAULT
 111 #endif
 112 #define ISER_DEF_CMD_PER_LUN            ISER_DEF_XMIT_CMDS_MAX
 113
 114 /* QP settings */
 115 /* Maximal bounds on received asynchronous PDUs */
 116 #define ISER_MAX_RX_MISC_PDUS           4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
 117
 118 #define ISER_MAX_TX_MISC_PDUS           6 /* NOOP_OUT(2), TEXT(1),         *
 119                                            * SCSI_TMFUNC(2), LOGOUT(1) */
 120
 121 #define ISER_QP_MAX_RECV_DTOS           (ISER_DEF_XMIT_CMDS_MAX)
 122
 123 #define ISER_MIN_POSTED_RX              (ISER_DEF_XMIT_CMDS_MAX >> 2)
 124
 125 /* the max TX (send) WR supported by the iSER QP is defined by                 *
 126  * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 127  * to have at max for SCSI command. The tx posting & completion handling code  *
 128  * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 129  * send WR. D=8 comes from 64K/8K                                              */
 130
 131 #define ISER_INFLIGHT_DATAOUTS          8
 132
 133 #define ISER_QP_MAX_REQ_DTOS            (ISER_DEF_XMIT_CMDS_MAX *    \
 134                                         (1 + ISER_INFLIGHT_DATAOUTS) + \
 135                                         ISER_MAX_TX_MISC_PDUS        + \
 136                                         ISER_MAX_RX_MISC_PDUS)
 137
 138 /* Max registration work requests per command */
 139 #define ISER_MAX_REG_WR_PER_CMD         5
 140
 141 /* For Signature we don't support DATAOUTs so no need to make room for them */
 142 #define ISER_QP_SIG_MAX_REQ_DTOS        (ISER_DEF_XMIT_CMDS_MAX *       \
 143                                         (1 + ISER_MAX_REG_WR_PER_CMD) + \
 144                                         ISER_MAX_TX_MISC_PDUS         + \
 145                                         ISER_MAX_RX_MISC_PDUS)
 146
 147 #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr                       \
 148                                          - ISER_MAX_TX_MISC_PDUS        \
 149                                          - ISER_MAX_RX_MISC_PDUS) /     \
 150                                          (1 + ISER_INFLIGHT_DATAOUTS))
 151
 152 #define ISER_SIGNAL_CMD_COUNT 32
 153
 154 /* Constant PDU lengths calculations */
 155 #define ISER_HEADERS_LEN        (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
 156
 157 #define ISER_RECV_DATA_SEG_LEN  128
 158 #define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 159 #define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 160
 161 /* Length of an object name string */
 162 #define ISER_OBJECT_NAME_SIZE               64
 163
 164 enum iser_conn_state {
 165         ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 166         ISER_CONN_PENDING,         /* in the process of being established */
 167         ISER_CONN_UP,              /* up and running                      */
 168         ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 169         ISER_CONN_DOWN,            /* shut down                           */
 170         ISER_CONN_STATES_NUM
 171 };
 172
 173 enum iser_task_status {
 174         ISER_TASK_STATUS_INIT = 0,
 175         ISER_TASK_STATUS_STARTED,
 176         ISER_TASK_STATUS_COMPLETED
 177 };
 178
 179 enum iser_data_dir {
 180         ISER_DIR_IN = 0,           /* to initiator */
 181         ISER_DIR_OUT,              /* from initiator */
 182         ISER_DIRS_NUM
 183 };
 184
 185 /**
 186  * struct iser_data_buf - iSER data buffer
 187  *
 188  * @sg:           pointer to the sg list
 189  * @size:         num entries of this sg
 190  * @data_len:     total beffer byte len
 191  * @dma_nents:    returned by dma_map_sg
 192  */
 193 struct iser_data_buf {
 194         struct scatterlist *sg;
 195         int                size;
 196         unsigned long      data_len;
 197         int                dma_nents;
 198 };
 199
 200 /* fwd declarations */
 201 struct iser_device;
 202 struct iscsi_iser_task;
 203 struct iscsi_endpoint;
 204 struct iser_reg_resources;
 205
 206 /**
 207  * struct iser_mem_reg - iSER memory registration info
 208  *
 209  * @sge:          memory region sg element
 210  * @rkey:         memory region remote key
 211  * @mem_h:        pointer to registration context (FMR/Fastreg)
 212  */
 213 struct iser_mem_reg {
 214         struct ib_sge    sge;
 215         u32              rkey;
 216         void            *mem_h;
 217 };
 218
 219 enum iser_desc_type {
 220         ISCSI_TX_CONTROL ,
 221         ISCSI_TX_SCSI_COMMAND,
 222         ISCSI_TX_DATAOUT
 223 };
 224
 225 /**
 226  * struct iser_tx_desc - iSER TX descriptor
 227  *
 228  * @iser_header:   iser header
 229  * @iscsi_header:  iscsi header
 230  * @type:          command/control/dataout
 231  * @dma_addr:      header buffer dma_address
 232  * @tx_sg:         sg[0] points to iser/iscsi headers
 233  *                 sg[1] optionally points to either of immediate data
 234  *                 unsolicited data-out or control
 235  * @num_sge:       number sges used on this TX task
 236  * @cqe:           completion handler
 237  * @mapped:        Is the task header mapped
 238  * @reg_wr:        registration WR
 239  * @send_wr:       send WR
 240  * @inv_wr:        invalidate WR
 241  */
 242 struct iser_tx_desc {
 243         struct iser_ctrl             iser_header;
 244         struct iscsi_hdr             iscsi_header;
 245         enum   iser_desc_type        type;
 246         u64                          dma_addr;
 247         struct ib_sge                tx_sg[2];
 248         int                          num_sge;
 249         struct ib_cqe                cqe;
 250         bool                         mapped;
 251         struct ib_reg_wr             reg_wr;
 252         struct ib_send_wr            send_wr;
 253         struct ib_send_wr            inv_wr;
 254 };
 255
 256 #define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 257                                  sizeof(u64) + sizeof(struct ib_sge) + \
 258                                  sizeof(struct ib_cqe)))
 259 /**
 260  * struct iser_rx_desc - iSER RX descriptor
 261  *
 262  * @iser_header:   iser header
 263  * @iscsi_header:  iscsi header
 264  * @data:          received data segment
 265  * @dma_addr:      receive buffer dma address
 266  * @rx_sg:         ib_sge of receive buffer
 267  * @cqe:           completion handler
 268  * @pad:           for sense data TODO: Modify to maximum sense length supported
 269  */
 270 struct iser_rx_desc {
 271         struct iser_ctrl             iser_header;
 272         struct iscsi_hdr             iscsi_header;
 273         char                         data[ISER_RECV_DATA_SEG_LEN];
 274         u64                          dma_addr;
 275         struct ib_sge                rx_sg;
 276         struct ib_cqe                cqe;
 277         char                         pad[ISER_RX_PAD_SIZE];
 278 } __packed;
 279
 280 /**
 281  * struct iser_login_desc - iSER login descriptor
 282  *
 283  * @req:           pointer to login request buffer
 284  * @rsp:           pointer to login response buffer
 285  * @req_dma:       DMA address of login request buffer
 286  * @rsp_dma:       DMA address of login response buffer
 287  * @sge:           IB sge for login post recv
 288  * @cqe:           completion handler
 289  */
 290 struct iser_login_desc {
 291         void                         *req;
 292         void                         *rsp;
 293         u64                          req_dma;
 294         u64                          rsp_dma;
 295         struct ib_sge                sge;
 296         struct ib_cqe                cqe;
 297 } __packed;
 298
 299 struct iser_conn;
 300 struct ib_conn;
 301 struct iscsi_iser_task;
 302
 303 /**
 304  * struct iser_comp - iSER completion context
 305  *
 306  * @cq:         completion queue
 307  * @active_qps: Number of active QPs attached
 308  *              to completion context
 309  */
 310 struct iser_comp {
 311         struct ib_cq            *cq;
 312         int                      active_qps;
 313 };
 314
 315 /**
 316  * struct iser_reg_ops - Memory registration operations
 317  *     per-device registration schemes
 318  *
 319  * @alloc_reg_res:     Allocate registration resources
 320  * @free_reg_res:      Free registration resources
 321  * @reg_mem:           Register memory buffers
 322  * @unreg_mem:         Un-register memory buffers
 323  * @reg_desc_get:      Get a registration descriptor for pool
 324  * @reg_desc_put:      Get a registration descriptor to pool
 325  */
 326 struct iser_reg_ops {
 327         int            (*alloc_reg_res)(struct ib_conn *ib_conn,
 328                                         unsigned cmds_max,
 329                                         unsigned int size);
 330         void           (*free_reg_res)(struct ib_conn *ib_conn);
 331         int            (*reg_mem)(struct iscsi_iser_task *iser_task,
 332                                   struct iser_data_buf *mem,
 333                                   struct iser_reg_resources *rsc,
 334                                   struct iser_mem_reg *reg);
 335         void           (*unreg_mem)(struct iscsi_iser_task *iser_task,
 336                                     enum iser_data_dir cmd_dir);
 337         struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
 338         void           (*reg_desc_put)(struct ib_conn *ib_conn,
 339                                        struct iser_fr_desc *desc);
 340 };
 341
 342 /**
 343  * struct iser_device - iSER device handle
 344  *
 345  * @ib_device:     RDMA device
 346  * @pd:            Protection Domain for this device
 347  * @mr:            Global DMA memory region
 348  * @event_handler: IB events handle routine
 349  * @ig_list:       entry in devices list
 350  * @refcount:      Reference counter, dominated by open iser connections
 351  * @comps_used:    Number of completion contexts used, Min between online
 352  *                 cpus and device max completion vectors
 353  * @comps:         Dinamically allocated array of completion handlers
 354  * @reg_ops:       Registration ops
 355  * @remote_inv_sup: Remote invalidate is supported on this device
 356  */
 357 struct iser_device {
 358         struct ib_device             *ib_device;
 359         struct ib_pd                 *pd;
 360         struct ib_event_handler      event_handler;
 361         struct list_head             ig_list;
 362         int                          refcount;
 363         int                          comps_used;
 364         struct iser_comp             *comps;
 365         const struct iser_reg_ops    *reg_ops;
 366         bool                         remote_inv_sup;
 367 };
 368
 369 /**
 370  * struct iser_reg_resources - Fast registration resources
 371  *
 372  * @mr:         memory region
 373  * @fmr_pool:   pool of fmrs
 374  * @sig_mr:     signature memory region
 375  * @page_vec:   fast reg page list used by fmr pool
 376  * @mr_valid:   is mr valid indicator
 377  */
 378 struct iser_reg_resources {
 379         union {
 380                 struct ib_mr             *mr;
 381                 struct ib_fmr_pool       *fmr_pool;
 382         };
 383         struct ib_mr                     *sig_mr;
 384         struct iser_page_vec             *page_vec;
 385         u8                                mr_valid:1;
 386 };
 387
 388 /**
 389  * struct iser_fr_desc - Fast registration descriptor
 390  *
 391  * @list:           entry in connection fastreg pool
 392  * @rsc:            data buffer registration resources
 393  * @sig_protected:  is region protected indicator
 394  */
 395 struct iser_fr_desc {
 396         struct list_head                  list;
 397         struct iser_reg_resources         rsc;
 398         bool                              sig_protected;
 399         struct list_head                  all_list;
 400 };
 401
 402 /**
 403  * struct iser_fr_pool - connection fast registration pool
 404  *
 405  * @list:                list of fastreg descriptors
 406  * @lock:                protects fmr/fastreg pool
 407  * @size:                size of the pool
 408  */
 409 struct iser_fr_pool {
 410         struct list_head        list;
 411         spinlock_t              lock;
 412         int                     size;
 413         struct list_head        all_list;
 414 };
 415
 416 /**
 417  * struct ib_conn - Infiniband related objects
 418  *
 419  * @cma_id:              rdma_cm connection maneger handle
 420  * @qp:                  Connection Queue-pair
 421  * @post_recv_buf_count: post receive counter
 422  * @sig_count:           send work request signal count
 423  * @rx_wr:               receive work request for batch posts
 424  * @device:              reference to iser device
 425  * @comp:                iser completion context
 426  * @fr_pool:             connection fast registration poool
 427  * @pi_support:          Indicate device T10-PI support
 428  * @reg_cqe:             completion handler
 429  */
 430 struct ib_conn {
 431         struct rdma_cm_id           *cma_id;
 432         struct ib_qp                *qp;
 433         int                          post_recv_buf_count;
 434         u8                           sig_count;
 435         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 436         struct iser_device          *device;
 437         struct iser_comp            *comp;
 438         struct iser_fr_pool          fr_pool;
 439         bool                         pi_support;
 440         struct ib_cqe                reg_cqe;
 441 };
 442
 443 /**
 444  * struct iser_conn - iSER connection context
 445  *
 446  * @ib_conn:          connection RDMA resources
 447  * @iscsi_conn:       link to matching iscsi connection
 448  * @ep:               transport handle
 449  * @state:            connection logical state
 450  * @qp_max_recv_dtos: maximum number of data outs, corresponds
 451  *                    to max number of post recvs
 452  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 453  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 454  * @max_cmds:         maximum cmds allowed for this connection
 455  * @name:             connection peer portal
 456  * @release_work:     deffered work for release job
 457  * @state_mutex:      protects iser onnection state
 458  * @stop_completion:  conn_stop completion
 459  * @ib_completion:    RDMA cleanup completion
 460  * @up_completion:    connection establishment completed
 461  *                    (state is ISER_CONN_UP)
 462  * @conn_list:        entry in ig conn list
 463  * @login_desc:       login descriptor
 464  * @rx_desc_head:     head of rx_descs cyclic buffer
 465  * @rx_descs:         rx buffers array (cyclic buffer)
 466  * @num_rx_descs:     number of rx descriptors
 467  * @scsi_sg_tablesize: scsi host sg_tablesize
 468  * @pages_per_mr:     maximum pages available for registration
 469  * @snd_w_inv:        connection uses remote invalidation
 470  */
 471 struct iser_conn {
 472         struct ib_conn               ib_conn;
 473         struct iscsi_conn            *iscsi_conn;
 474         struct iscsi_endpoint        *ep;
 475         enum iser_conn_state         state;
 476         unsigned                     qp_max_recv_dtos;
 477         unsigned                     qp_max_recv_dtos_mask;
 478         unsigned                     min_posted_rx;
 479         u16                          max_cmds;
 480         char                         name[ISER_OBJECT_NAME_SIZE];
 481         struct work_struct           release_work;
 482         struct mutex                 state_mutex;
 483         struct completion            stop_completion;
 484         struct completion            ib_completion;
 485         struct completion            up_completion;
 486         struct list_head             conn_list;
 487         struct iser_login_desc       login_desc;
 488         unsigned int                 rx_desc_head;
 489         struct iser_rx_desc          *rx_descs;
 490         u32                          num_rx_descs;
 491         unsigned short               scsi_sg_tablesize;
 492         unsigned short               pages_per_mr;
 493         bool                         snd_w_inv;
 494 };
 495
 496 /**
 497  * struct iscsi_iser_task - iser task context
 498  *
 499  * @desc:     TX descriptor
 500  * @iser_conn:        link to iser connection
 501  * @status:           current task status
 502  * @sc:               link to scsi command
 503  * @command_sent:     indicate if command was sent
 504  * @dir:              iser data direction
 505  * @rdma_reg:         task rdma registration desc
 506  * @data:             iser data buffer desc
 507  * @prot:             iser protection buffer desc
 508  */
 509 struct iscsi_iser_task {
 510         struct iser_tx_desc          desc;
 511         struct iser_conn             *iser_conn;
 512         enum iser_task_status        status;
 513         struct scsi_cmnd             *sc;
 514         int                          command_sent;
 515         int                          dir[ISER_DIRS_NUM];
 516         struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 517         struct iser_data_buf         data[ISER_DIRS_NUM];
 518         struct iser_data_buf         prot[ISER_DIRS_NUM];
 519 };
 520
 521 struct iser_page_vec {
 522         u64 *pages;
 523         int npages;
 524         struct ib_mr fake_mr;
 525 };
 526
 527 /**
 528  * struct iser_global - iSER global context
 529  *
 530  * @device_list_mutex:    protects device_list
 531  * @device_list:          iser devices global list
 532  * @connlist_mutex:       protects connlist
 533  * @connlist:             iser connections global list
 534  * @desc_cache:           kmem cache for tx dataout
 535  */
 536 struct iser_global {
 537         struct mutex      device_list_mutex;
 538         struct list_head  device_list;
 539         struct mutex      connlist_mutex;
 540         struct list_head  connlist;
 541         struct kmem_cache *desc_cache;
 542 };
 543
 544 extern struct iser_global ig;
 545 extern int iser_debug_level;
 546 extern bool iser_pi_enable;
 547 extern int iser_pi_guard;
 548 extern unsigned int iser_max_sectors;
 549 extern bool iser_always_reg;
 550
 551 int iser_assign_reg_ops(struct iser_device *device);
 552
 553 int iser_send_control(struct iscsi_conn *conn,
 554                       struct iscsi_task *task);
 555
 556 int iser_send_command(struct iscsi_conn *conn,
 557                       struct iscsi_task *task);
 558
 559 int iser_send_data_out(struct iscsi_conn *conn,
 560                        struct iscsi_task *task,
 561                        struct iscsi_data *hdr);
 562
 563 void iscsi_iser_recv(struct iscsi_conn *conn,
 564                      struct iscsi_hdr *hdr,
 565                      char *rx_data,
 566                      int rx_data_len);
 567
 568 void iser_conn_init(struct iser_conn *iser_conn);
 569
 570 void iser_conn_release(struct iser_conn *iser_conn);
 571
 572 int iser_conn_terminate(struct iser_conn *iser_conn);
 573
 574 void iser_release_work(struct work_struct *work);
 575
 576 void iser_err_comp(struct ib_wc *wc, const char *type);
 577 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
 578 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
 579 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
 580 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
 581 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
 582 void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
 583
 584 void iser_task_rdma_init(struct iscsi_iser_task *task);
 585
 586 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 587
 588 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 589
 590 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 591                                      struct iser_data_buf *mem,
 592                                      enum iser_data_dir cmd_dir);
 593
 594 int iser_reg_rdma_mem(struct iscsi_iser_task *task,
 595                       enum iser_data_dir dir,
 596                       bool all_imm);
 597 void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
 598                          enum iser_data_dir dir);
 599
 600 int  iser_connect(struct iser_conn *iser_conn,
 601                   struct sockaddr *src_addr,
 602                   struct sockaddr *dst_addr,
 603                   int non_blocking);
 604
 605 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 606                         enum iser_data_dir cmd_dir);
 607 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 608                             enum iser_data_dir cmd_dir);
 609
 610 int  iser_post_recvl(struct iser_conn *iser_conn);
 611 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 612 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 613                     bool signal);
 614
 615 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 616                            struct iser_data_buf *data,
 617                            enum iser_data_dir iser_dir,
 618                            enum dma_data_direction dma_dir);
 619
 620 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 621                               struct iser_data_buf *data,
 622                               enum dma_data_direction dir);
 623
 624 int  iser_initialize_task_headers(struct iscsi_task *task,
 625                         struct iser_tx_desc *tx_desc);
 626 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 627                               struct iscsi_session *session);
 628 int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
 629                         unsigned cmds_max,
 630                         unsigned int size);
 631 void iser_free_fmr_pool(struct ib_conn *ib_conn);
 632 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
 633                             unsigned cmds_max,
 634                             unsigned int size);
 635 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 636 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 637                              enum iser_data_dir cmd_dir, sector_t *sector);
 638 struct iser_fr_desc *
 639 iser_reg_desc_get_fr(struct ib_conn *ib_conn);
 640 void
 641 iser_reg_desc_put_fr(struct ib_conn *ib_conn,
 642                      struct iser_fr_desc *desc);
 643 struct iser_fr_desc *
 644 iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
 645 void
 646 iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
 647                       struct iser_fr_desc *desc);
 648
 649 static inline struct iser_conn *
 650 to_iser_conn(struct ib_conn *ib_conn)
 651 {
 652         return container_of(ib_conn, struct iser_conn, ib_conn);
 653 }
 654
 655 static inline struct iser_rx_desc *
 656 iser_rx(struct ib_cqe *cqe)
 657 {
 658         return container_of(cqe, struct iser_rx_desc, cqe);
 659 }
 660
 661 static inline struct iser_tx_desc *
 662 iser_tx(struct ib_cqe *cqe)
 663 {
 664         return container_of(cqe, struct iser_tx_desc, cqe);
 665 }
 666
 667 static inline struct iser_login_desc *
 668 iser_login(struct ib_cqe *cqe)
 669 {
 670         return container_of(cqe, struct iser_login_desc, cqe);
 671 }
 672
 673 #endif