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
 102 /* Default support is 512KB I/O size */
 103 #define ISER_DEF_MAX_SECTORS            1024
 104 #define ISCSI_ISER_DEF_SG_TABLESIZE     ((ISER_DEF_MAX_SECTORS * 512) >> SHIFT_4K)
 105 /* Maximum support is 8MB I/O size */
 106 #define ISCSI_ISER_MAX_SG_TABLESIZE     ((16384 * 512) >> SHIFT_4K)
 107
 108 #define ISER_DEF_XMIT_CMDS_DEFAULT              512
 109 #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
 110         #define ISER_DEF_XMIT_CMDS_MAX          ISCSI_DEF_XMIT_CMDS_MAX
 111 #else
 112         #define ISER_DEF_XMIT_CMDS_MAX          ISER_DEF_XMIT_CMDS_DEFAULT
 113 #endif
 114 #define ISER_DEF_CMD_PER_LUN            ISER_DEF_XMIT_CMDS_MAX
 115
 116 /* QP settings */
 117 /* Maximal bounds on received asynchronous PDUs */
 118 #define ISER_MAX_RX_MISC_PDUS           4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
 119
 120 #define ISER_MAX_TX_MISC_PDUS           6 /* NOOP_OUT(2), TEXT(1),         *
 121                                            * SCSI_TMFUNC(2), LOGOUT(1) */
 122
 123 #define ISER_QP_MAX_RECV_DTOS           (ISER_DEF_XMIT_CMDS_MAX)
 124
 125 #define ISER_MIN_POSTED_RX              (ISER_DEF_XMIT_CMDS_MAX >> 2)
 126
 127 /* the max TX (send) WR supported by the iSER QP is defined by                 *
 128  * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 129  * to have at max for SCSI command. The tx posting & completion handling code  *
 130  * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 131  * send WR. D=8 comes from 64K/8K                                              */
 132
 133 #define ISER_INFLIGHT_DATAOUTS          8
 134
 135 #define ISER_QP_MAX_REQ_DTOS            (ISER_DEF_XMIT_CMDS_MAX *    \
 136                                         (1 + ISER_INFLIGHT_DATAOUTS) + \
 137                                         ISER_MAX_TX_MISC_PDUS        + \
 138                                         ISER_MAX_RX_MISC_PDUS)
 139
 140 /* Max registration work requests per command */
 141 #define ISER_MAX_REG_WR_PER_CMD         5
 142
 143 /* For Signature we don't support DATAOUTs so no need to make room for them */
 144 #define ISER_QP_SIG_MAX_REQ_DTOS        (ISER_DEF_XMIT_CMDS_MAX *       \
 145                                         (1 + ISER_MAX_REG_WR_PER_CMD) + \
 146                                         ISER_MAX_TX_MISC_PDUS         + \
 147                                         ISER_MAX_RX_MISC_PDUS)
 148
 149 #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr                       \
 150                                          - ISER_MAX_TX_MISC_PDUS        \
 151                                          - ISER_MAX_RX_MISC_PDUS) /     \
 152                                          (1 + ISER_INFLIGHT_DATAOUTS))
 153
 154 #define ISER_WC_BATCH_COUNT   16
 155 #define ISER_SIGNAL_CMD_COUNT 32
 156
 157 #define ISER_VER                        0x10
 158 #define ISER_WSV                        0x08
 159 #define ISER_RSV                        0x04
 160
 161 #define ISER_FASTREG_LI_WRID            0xffffffffffffffffULL
 162 #define ISER_BEACON_WRID                0xfffffffffffffffeULL
 163
 164 /**
 165  * struct iser_hdr - iSER header
 166  *
 167  * @flags:        flags support (zbva, remote_inv)
 168  * @rsvd:         reserved
 169  * @write_stag:   write rkey
 170  * @write_va:     write virtual address
 171  * @reaf_stag:    read rkey
 172  * @read_va:      read virtual address
 173  */
 174 struct iser_hdr {
 175         u8      flags;
 176         u8      rsvd[3];
 177         __be32  write_stag;
 178         __be64  write_va;
 179         __be32  read_stag;
 180         __be64  read_va;
 181 } __attribute__((packed));
 182
 183
 184 #define ISER_ZBVA_NOT_SUPPORTED         0x80
 185 #define ISER_SEND_W_INV_NOT_SUPPORTED   0x40
 186
 187 struct iser_cm_hdr {
 188         u8      flags;
 189         u8      rsvd[3];
 190 } __packed;
 191
 192 /* Constant PDU lengths calculations */
 193 #define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
 194
 195 #define ISER_RECV_DATA_SEG_LEN  128
 196 #define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 197 #define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 198
 199 /* Length of an object name string */
 200 #define ISER_OBJECT_NAME_SIZE               64
 201
 202 enum iser_conn_state {
 203         ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 204         ISER_CONN_PENDING,         /* in the process of being established */
 205         ISER_CONN_UP,              /* up and running                      */
 206         ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 207         ISER_CONN_DOWN,            /* shut down                           */
 208         ISER_CONN_STATES_NUM
 209 };
 210
 211 enum iser_task_status {
 212         ISER_TASK_STATUS_INIT = 0,
 213         ISER_TASK_STATUS_STARTED,
 214         ISER_TASK_STATUS_COMPLETED
 215 };
 216
 217 enum iser_data_dir {
 218         ISER_DIR_IN = 0,           /* to initiator */
 219         ISER_DIR_OUT,              /* from initiator */
 220         ISER_DIRS_NUM
 221 };
 222
 223 /**
 224  * struct iser_data_buf - iSER data buffer
 225  *
 226  * @sg:           pointer to the sg list
 227  * @size:         num entries of this sg
 228  * @data_len:     total beffer byte len
 229  * @dma_nents:    returned by dma_map_sg
 230  * @orig_sg:      pointer to the original sg list (in case
 231  *                we used a copy)
 232  * @orig_size:    num entris of orig sg list
 233  */
 234 struct iser_data_buf {
 235         struct scatterlist *sg;
 236         unsigned int       size;
 237         unsigned long      data_len;
 238         unsigned int       dma_nents;
 239         struct scatterlist *orig_sg;
 240         unsigned int       orig_size;
 241   };
 242
 243 /* fwd declarations */
 244 struct iser_device;
 245 struct iscsi_iser_task;
 246 struct iscsi_endpoint;
 247 struct iser_reg_resources;
 248
 249 /**
 250  * struct iser_mem_reg - iSER memory registration info
 251  *
 252  * @sge:          memory region sg element
 253  * @rkey:         memory region remote key
 254  * @mem_h:        pointer to registration context (FMR/Fastreg)
 255  */
 256 struct iser_mem_reg {
 257         struct ib_sge    sge;
 258         u32              rkey;
 259         void            *mem_h;
 260 };
 261
 262 enum iser_desc_type {
 263         ISCSI_TX_CONTROL ,
 264         ISCSI_TX_SCSI_COMMAND,
 265         ISCSI_TX_DATAOUT
 266 };
 267
 268 /* Maximum number of work requests per task:
 269  * Data memory region local invalidate + fast registration
 270  * Protection memory region local invalidate + fast registration
 271  * Signature memory region local invalidate + fast registration
 272  * PDU send
 273  */
 274 #define ISER_MAX_WRS 7
 275
 276 /**
 277  * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
 278  *
 279  * @iser_header:   iser header
 280  * @iscsi_header:  iscsi header
 281  * @type:          command/control/dataout
 282  * @dam_addr:      header buffer dma_address
 283  * @tx_sg:         sg[0] points to iser/iscsi headers
 284  *                 sg[1] optionally points to either of immediate data
 285  *                 unsolicited data-out or control
 286  * @num_sge:       number sges used on this TX task
 287  * @mapped:        Is the task header mapped
 288  * @wr_idx:        Current WR index
 289  * @wrs:           Array of WRs per task
 290  * @data_reg:      Data buffer registration details
 291  * @prot_reg:      Protection buffer registration details
 292  * @sig_attrs:     Signature attributes
 293  */
 294 struct iser_tx_desc {
 295         struct iser_hdr              iser_header;
 296         struct iscsi_hdr             iscsi_header;
 297         enum   iser_desc_type        type;
 298         u64                          dma_addr;
 299         struct ib_sge                tx_sg[2];
 300         int                          num_sge;
 301         bool                         mapped;
 302         u8                           wr_idx;
 303         struct ib_send_wr            wrs[ISER_MAX_WRS];
 304         struct iser_mem_reg          data_reg;
 305         struct iser_mem_reg          prot_reg;
 306         struct ib_sig_attrs          sig_attrs;
 307 };
 308
 309 #define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 310                                         sizeof(u64) + sizeof(struct ib_sge)))
 311 /**
 312  * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
 313  *
 314  * @iser_header:   iser header
 315  * @iscsi_header:  iscsi header
 316  * @data:          received data segment
 317  * @dma_addr:      receive buffer dma address
 318  * @rx_sg:         ib_sge of receive buffer
 319  * @pad:           for sense data TODO: Modify to maximum sense length supported
 320  */
 321 struct iser_rx_desc {
 322         struct iser_hdr              iser_header;
 323         struct iscsi_hdr             iscsi_header;
 324         char                         data[ISER_RECV_DATA_SEG_LEN];
 325         u64                          dma_addr;
 326         struct ib_sge                rx_sg;
 327         char                         pad[ISER_RX_PAD_SIZE];
 328 } __attribute__((packed));
 329
 330 struct iser_conn;
 331 struct ib_conn;
 332 struct iscsi_iser_task;
 333
 334 /**
 335  * struct iser_comp - iSER completion context
 336  *
 337  * @device:     pointer to device handle
 338  * @cq:         completion queue
 339  * @wcs:        work completion array
 340  * @tasklet:    Tasklet handle
 341  * @active_qps: Number of active QPs attached
 342  *              to completion context
 343  */
 344 struct iser_comp {
 345         struct iser_device      *device;
 346         struct ib_cq            *cq;
 347         struct ib_wc             wcs[ISER_WC_BATCH_COUNT];
 348         struct tasklet_struct    tasklet;
 349         int                      active_qps;
 350 };
 351
 352 /**
 353  * struct iser_device - Memory registration operations
 354  *     per-device registration schemes
 355  *
 356  * @alloc_reg_res:     Allocate registration resources
 357  * @free_reg_res:      Free registration resources
 358  * @fast_reg_mem:      Register memory buffers
 359  * @unreg_mem:         Un-register memory buffers
 360  * @reg_desc_get:      Get a registration descriptor for pool
 361  * @reg_desc_put:      Get a registration descriptor to pool
 362  */
 363 struct iser_reg_ops {
 364         int            (*alloc_reg_res)(struct ib_conn *ib_conn,
 365                                         unsigned cmds_max,
 366                                         unsigned int size);
 367         void           (*free_reg_res)(struct ib_conn *ib_conn);
 368         int            (*reg_mem)(struct iscsi_iser_task *iser_task,
 369                                   struct iser_data_buf *mem,
 370                                   struct iser_reg_resources *rsc,
 371                                   struct iser_mem_reg *reg);
 372         void           (*unreg_mem)(struct iscsi_iser_task *iser_task,
 373                                     enum iser_data_dir cmd_dir);
 374         struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
 375         void           (*reg_desc_put)(struct ib_conn *ib_conn,
 376                                        struct iser_fr_desc *desc);
 377 };
 378
 379 /**
 380  * struct iser_device - iSER device handle
 381  *
 382  * @ib_device:     RDMA device
 383  * @pd:            Protection Domain for this device
 384  * @dev_attr:      Device attributes container
 385  * @mr:            Global DMA memory region
 386  * @event_handler: IB events handle routine
 387  * @ig_list:       entry in devices list
 388  * @refcount:      Reference counter, dominated by open iser connections
 389  * @comps_used:    Number of completion contexts used, Min between online
 390  *                 cpus and device max completion vectors
 391  * @comps:         Dinamically allocated array of completion handlers
 392  * @reg_ops:       Registration ops
 393  */
 394 struct iser_device {
 395         struct ib_device             *ib_device;
 396         struct ib_pd                 *pd;
 397         struct ib_device_attr        dev_attr;
 398         struct ib_mr                 *mr;
 399         struct ib_event_handler      event_handler;
 400         struct list_head             ig_list;
 401         int                          refcount;
 402         int                          comps_used;
 403         struct iser_comp             *comps;
 404         struct iser_reg_ops          *reg_ops;
 405 };
 406
 407 #define ISER_CHECK_GUARD        0xc0
 408 #define ISER_CHECK_REFTAG       0x0f
 409 #define ISER_CHECK_APPTAG       0x30
 410
 411 /**
 412  * struct iser_reg_resources - Fast registration recources
 413  *
 414  * @mr:         memory region
 415  * @fmr_pool:   pool of fmrs
 416  * @frpl:       fast reg page list used by frwrs
 417  * @page_vec:   fast reg page list used by fmr pool
 418  * @mr_valid:   is mr valid indicator
 419  */
 420 struct iser_reg_resources {
 421         union {
 422                 struct ib_mr             *mr;
 423                 struct ib_fmr_pool       *fmr_pool;
 424         };
 425         union {
 426                 struct ib_fast_reg_page_list     *frpl;
 427                 struct iser_page_vec             *page_vec;
 428         };
 429         u8                                mr_valid:1;
 430 };
 431
 432 /**
 433  * struct iser_pi_context - Protection information context
 434  *
 435  * @rsc:             protection buffer registration resources
 436  * @sig_mr:          signature enable memory region
 437  * @sig_mr_valid:    is sig_mr valid indicator
 438  * @sig_protected:   is region protected indicator
 439  */
 440 struct iser_pi_context {
 441         struct iser_reg_resources       rsc;
 442         struct ib_mr                   *sig_mr;
 443         u8                              sig_mr_valid:1;
 444         u8                              sig_protected:1;
 445 };
 446
 447 /**
 448  * struct iser_fr_desc - Fast registration descriptor
 449  *
 450  * @list:           entry in connection fastreg pool
 451  * @rsc:            data buffer registration resources
 452  * @pi_ctx:         protection information context
 453  */
 454 struct iser_fr_desc {
 455         struct list_head                  list;
 456         struct iser_reg_resources         rsc;
 457         struct iser_pi_context           *pi_ctx;
 458 };
 459
 460 /**
 461  * struct iser_fr_pool: connection fast registration pool
 462  *
 463  * @list:                list of fastreg descriptors
 464  * @lock:                protects fmr/fastreg pool
 465  * @size:                size of the pool
 466  */
 467 struct iser_fr_pool {
 468         struct list_head        list;
 469         spinlock_t              lock;
 470         int                     size;
 471 };
 472
 473 /**
 474  * struct ib_conn - Infiniband related objects
 475  *
 476  * @cma_id:              rdma_cm connection maneger handle
 477  * @qp:                  Connection Queue-pair
 478  * @post_recv_buf_count: post receive counter
 479  * @sig_count:           send work request signal count
 480  * @rx_wr:               receive work request for batch posts
 481  * @device:              reference to iser device
 482  * @comp:                iser completion context
 483  * @pi_support:          Indicate device T10-PI support
 484  * @beacon:              beacon send wr to signal all flush errors were drained
 485  * @flush_comp:          completes when all connection completions consumed
 486  * @fr_pool:             connection fast registration poool
 487  */
 488 struct ib_conn {
 489         struct rdma_cm_id           *cma_id;
 490         struct ib_qp                *qp;
 491         int                          post_recv_buf_count;
 492         u8                           sig_count;
 493         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 494         struct iser_device          *device;
 495         struct iser_comp            *comp;
 496         bool                         pi_support;
 497         struct ib_send_wr            beacon;
 498         struct completion            flush_comp;
 499         struct iser_fr_pool          fr_pool;
 500 };
 501
 502 /**
 503  * struct iser_conn - iSER connection context
 504  *
 505  * @ib_conn:          connection RDMA resources
 506  * @iscsi_conn:       link to matching iscsi connection
 507  * @ep:               transport handle
 508  * @state:            connection logical state
 509  * @qp_max_recv_dtos: maximum number of data outs, corresponds
 510  *                    to max number of post recvs
 511  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 512  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 513  * @max_cmds:         maximum cmds allowed for this connection
 514  * @name:             connection peer portal
 515  * @release_work:     deffered work for release job
 516  * @state_mutex:      protects iser onnection state
 517  * @stop_completion:  conn_stop completion
 518  * @ib_completion:    RDMA cleanup completion
 519  * @up_completion:    connection establishment completed
 520  *                    (state is ISER_CONN_UP)
 521  * @conn_list:        entry in ig conn list
 522  * @login_buf:        login data buffer (stores login parameters)
 523  * @login_req_buf:    login request buffer
 524  * @login_req_dma:    login request buffer dma address
 525  * @login_resp_buf:   login response buffer
 526  * @login_resp_dma:   login response buffer dma address
 527  * @rx_desc_head:     head of rx_descs cyclic buffer
 528  * @rx_descs:         rx buffers array (cyclic buffer)
 529  * @num_rx_descs:     number of rx descriptors
 530  * @scsi_sg_tablesize: scsi host sg_tablesize
 531  * @scsi_max_sectors: scsi host max sectors
 532  */
 533 struct iser_conn {
 534         struct ib_conn               ib_conn;
 535         struct iscsi_conn            *iscsi_conn;
 536         struct iscsi_endpoint        *ep;
 537         enum iser_conn_state         state;
 538         unsigned                     qp_max_recv_dtos;
 539         unsigned                     qp_max_recv_dtos_mask;
 540         unsigned                     min_posted_rx;
 541         u16                          max_cmds;
 542         char                         name[ISER_OBJECT_NAME_SIZE];
 543         struct work_struct           release_work;
 544         struct mutex                 state_mutex;
 545         struct completion            stop_completion;
 546         struct completion            ib_completion;
 547         struct completion            up_completion;
 548         struct list_head             conn_list;
 549
 550         char                         *login_buf;
 551         char                         *login_req_buf, *login_resp_buf;
 552         u64                          login_req_dma, login_resp_dma;
 553         unsigned int                 rx_desc_head;
 554         struct iser_rx_desc          *rx_descs;
 555         u32                          num_rx_descs;
 556         unsigned short               scsi_sg_tablesize;
 557         unsigned int                 scsi_max_sectors;
 558 };
 559
 560 /**
 561  * struct iscsi_iser_task - iser task context
 562  *
 563  * @desc:     TX descriptor
 564  * @iser_conn:        link to iser connection
 565  * @status:           current task status
 566  * @sc:               link to scsi command
 567  * @command_sent:     indicate if command was sent
 568  * @dir:              iser data direction
 569  * @rdma_reg:         task rdma registration desc
 570  * @data:             iser data buffer desc
 571  * @prot:             iser protection buffer desc
 572  */
 573 struct iscsi_iser_task {
 574         struct iser_tx_desc          desc;
 575         struct iser_conn             *iser_conn;
 576         enum iser_task_status        status;
 577         struct scsi_cmnd             *sc;
 578         int                          command_sent;
 579         int                          dir[ISER_DIRS_NUM];
 580         struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 581         struct iser_data_buf         data[ISER_DIRS_NUM];
 582         struct iser_data_buf         prot[ISER_DIRS_NUM];
 583 };
 584
 585 struct iser_page_vec {
 586         u64 *pages;
 587         int length;
 588         int offset;
 589         int data_size;
 590 };
 591
 592 /**
 593  * struct iser_global: iSER global context
 594  *
 595  * @device_list_mutex:    protects device_list
 596  * @device_list:          iser devices global list
 597  * @connlist_mutex:       protects connlist
 598  * @connlist:             iser connections global list
 599  * @desc_cache:           kmem cache for tx dataout
 600  */
 601 struct iser_global {
 602         struct mutex      device_list_mutex;
 603         struct list_head  device_list;
 604         struct mutex      connlist_mutex;
 605         struct list_head  connlist;
 606         struct kmem_cache *desc_cache;
 607 };
 608
 609 extern struct iser_global ig;
 610 extern int iser_debug_level;
 611 extern bool iser_pi_enable;
 612 extern int iser_pi_guard;
 613 extern unsigned int iser_max_sectors;
 614 extern bool iser_always_reg;
 615
 616 int iser_assign_reg_ops(struct iser_device *device);
 617
 618 int iser_send_control(struct iscsi_conn *conn,
 619                       struct iscsi_task *task);
 620
 621 int iser_send_command(struct iscsi_conn *conn,
 622                       struct iscsi_task *task);
 623
 624 int iser_send_data_out(struct iscsi_conn *conn,
 625                        struct iscsi_task *task,
 626                        struct iscsi_data *hdr);
 627
 628 void iscsi_iser_recv(struct iscsi_conn *conn,
 629                      struct iscsi_hdr *hdr,
 630                      char *rx_data,
 631                      int rx_data_len);
 632
 633 void iser_conn_init(struct iser_conn *iser_conn);
 634
 635 void iser_conn_release(struct iser_conn *iser_conn);
 636
 637 int iser_conn_terminate(struct iser_conn *iser_conn);
 638
 639 void iser_release_work(struct work_struct *work);
 640
 641 void iser_rcv_completion(struct iser_rx_desc *desc,
 642                          unsigned long dto_xfer_len,
 643                          struct ib_conn *ib_conn);
 644
 645 void iser_snd_completion(struct iser_tx_desc *desc,
 646                          struct ib_conn *ib_conn);
 647
 648 void iser_task_rdma_init(struct iscsi_iser_task *task);
 649
 650 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 651
 652 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 653
 654 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 655                                      struct iser_data_buf *mem,
 656                                      enum iser_data_dir cmd_dir);
 657
 658 int iser_reg_rdma_mem(struct iscsi_iser_task *task,
 659                       enum iser_data_dir dir);
 660 void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
 661                          enum iser_data_dir dir);
 662
 663 int  iser_connect(struct iser_conn *iser_conn,
 664                   struct sockaddr *src_addr,
 665                   struct sockaddr *dst_addr,
 666                   int non_blocking);
 667
 668 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 669                         enum iser_data_dir cmd_dir);
 670 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 671                             enum iser_data_dir cmd_dir);
 672
 673 int  iser_post_recvl(struct iser_conn *iser_conn);
 674 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 675 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 676                     bool signal);
 677
 678 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 679                            struct iser_data_buf *data,
 680                            enum iser_data_dir iser_dir,
 681                            enum dma_data_direction dma_dir);
 682
 683 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 684                               struct iser_data_buf *data,
 685                               enum dma_data_direction dir);
 686
 687 int  iser_initialize_task_headers(struct iscsi_task *task,
 688                         struct iser_tx_desc *tx_desc);
 689 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 690                               struct iscsi_session *session);
 691 int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
 692                         unsigned cmds_max,
 693                         unsigned int size);
 694 void iser_free_fmr_pool(struct ib_conn *ib_conn);
 695 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
 696                             unsigned cmds_max,
 697                             unsigned int size);
 698 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 699 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 700                              enum iser_data_dir cmd_dir, sector_t *sector);
 701 struct iser_fr_desc *
 702 iser_reg_desc_get_fr(struct ib_conn *ib_conn);
 703 void
 704 iser_reg_desc_put_fr(struct ib_conn *ib_conn,
 705                      struct iser_fr_desc *desc);
 706 struct iser_fr_desc *
 707 iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
 708 void
 709 iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
 710                       struct iser_fr_desc *desc);
 711
 712 static inline struct ib_send_wr *
 713 iser_tx_next_wr(struct iser_tx_desc *tx_desc)
 714 {
 715         struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx];
 716         struct ib_send_wr *last_wr;
 717
 718         if (tx_desc->wr_idx) {
 719                 last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1];
 720                 last_wr->next = cur_wr;
 721         }
 722         tx_desc->wr_idx++;
 723
 724         return cur_wr;
 725 }
 726
 727 #endif