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_SIGNAL_CMD_COUNT 32
 155
 156 #define ISER_VER                        0x10
 157 #define ISER_WSV                        0x08
 158 #define ISER_RSV                        0x04
 159
 160 /**
 161  * struct iser_hdr - iSER header
 162  *
 163  * @flags:        flags support (zbva, remote_inv)
 164  * @rsvd:         reserved
 165  * @write_stag:   write rkey
 166  * @write_va:     write virtual address
 167  * @reaf_stag:    read rkey
 168  * @read_va:      read virtual address
 169  */
 170 struct iser_hdr {
 171         u8      flags;
 172         u8      rsvd[3];
 173         __be32  write_stag;
 174         __be64  write_va;
 175         __be32  read_stag;
 176         __be64  read_va;
 177 } __attribute__((packed));
 178
 179
 180 #define ISER_ZBVA_NOT_SUPPORTED         0x80
 181 #define ISER_SEND_W_INV_NOT_SUPPORTED   0x40
 182
 183 struct iser_cm_hdr {
 184         u8      flags;
 185         u8      rsvd[3];
 186 } __packed;
 187
 188 /* Constant PDU lengths calculations */
 189 #define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
 190
 191 #define ISER_RECV_DATA_SEG_LEN  128
 192 #define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 193 #define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 194
 195 /* Length of an object name string */
 196 #define ISER_OBJECT_NAME_SIZE               64
 197
 198 enum iser_conn_state {
 199         ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 200         ISER_CONN_PENDING,         /* in the process of being established */
 201         ISER_CONN_UP,              /* up and running                      */
 202         ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 203         ISER_CONN_DOWN,            /* shut down                           */
 204         ISER_CONN_STATES_NUM
 205 };
 206
 207 enum iser_task_status {
 208         ISER_TASK_STATUS_INIT = 0,
 209         ISER_TASK_STATUS_STARTED,
 210         ISER_TASK_STATUS_COMPLETED
 211 };
 212
 213 enum iser_data_dir {
 214         ISER_DIR_IN = 0,           /* to initiator */
 215         ISER_DIR_OUT,              /* from initiator */
 216         ISER_DIRS_NUM
 217 };
 218
 219 /**
 220  * struct iser_data_buf - iSER data buffer
 221  *
 222  * @sg:           pointer to the sg list
 223  * @size:         num entries of this sg
 224  * @data_len:     total beffer byte len
 225  * @dma_nents:    returned by dma_map_sg
 226  */
 227 struct iser_data_buf {
 228         struct scatterlist *sg;
 229         int                size;
 230         unsigned long      data_len;
 231         unsigned int       dma_nents;
 232 };
 233
 234 /* fwd declarations */
 235 struct iser_device;
 236 struct iscsi_iser_task;
 237 struct iscsi_endpoint;
 238 struct iser_reg_resources;
 239
 240 /**
 241  * struct iser_mem_reg - iSER memory registration info
 242  *
 243  * @sge:          memory region sg element
 244  * @rkey:         memory region remote key
 245  * @mem_h:        pointer to registration context (FMR/Fastreg)
 246  */
 247 struct iser_mem_reg {
 248         struct ib_sge    sge;
 249         u32              rkey;
 250         void            *mem_h;
 251 };
 252
 253 enum iser_desc_type {
 254         ISCSI_TX_CONTROL ,
 255         ISCSI_TX_SCSI_COMMAND,
 256         ISCSI_TX_DATAOUT
 257 };
 258
 259 /* Maximum number of work requests per task:
 260  * Data memory region local invalidate + fast registration
 261  * Protection memory region local invalidate + fast registration
 262  * Signature memory region local invalidate + fast registration
 263  * PDU send
 264  */
 265 #define ISER_MAX_WRS 7
 266
 267 /**
 268  * struct iser_tx_desc - iSER TX descriptor
 269  *
 270  * @iser_header:   iser header
 271  * @iscsi_header:  iscsi header
 272  * @type:          command/control/dataout
 273  * @dam_addr:      header buffer dma_address
 274  * @tx_sg:         sg[0] points to iser/iscsi headers
 275  *                 sg[1] optionally points to either of immediate data
 276  *                 unsolicited data-out or control
 277  * @num_sge:       number sges used on this TX task
 278  * @mapped:        Is the task header mapped
 279  * @wr_idx:        Current WR index
 280  * @wrs:           Array of WRs per task
 281  * @data_reg:      Data buffer registration details
 282  * @prot_reg:      Protection buffer registration details
 283  * @sig_attrs:     Signature attributes
 284  */
 285 struct iser_tx_desc {
 286         struct iser_hdr              iser_header;
 287         struct iscsi_hdr             iscsi_header;
 288         enum   iser_desc_type        type;
 289         u64                          dma_addr;
 290         struct ib_sge                tx_sg[2];
 291         int                          num_sge;
 292         struct ib_cqe                cqe;
 293         bool                         mapped;
 294         u8                           wr_idx;
 295         union iser_wr {
 296                 struct ib_send_wr               send;
 297                 struct ib_reg_wr                fast_reg;
 298                 struct ib_sig_handover_wr       sig;
 299         } wrs[ISER_MAX_WRS];
 300         struct iser_mem_reg          data_reg;
 301         struct iser_mem_reg          prot_reg;
 302         struct ib_sig_attrs          sig_attrs;
 303 };
 304
 305 #define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 306                                  sizeof(u64) + sizeof(struct ib_sge) + \
 307                                  sizeof(struct ib_cqe)))
 308 /**
 309  * struct iser_rx_desc - iSER RX descriptor
 310  *
 311  * @iser_header:   iser header
 312  * @iscsi_header:  iscsi header
 313  * @data:          received data segment
 314  * @dma_addr:      receive buffer dma address
 315  * @rx_sg:         ib_sge of receive buffer
 316  * @pad:           for sense data TODO: Modify to maximum sense length supported
 317  */
 318 struct iser_rx_desc {
 319         struct iser_hdr              iser_header;
 320         struct iscsi_hdr             iscsi_header;
 321         char                         data[ISER_RECV_DATA_SEG_LEN];
 322         u64                          dma_addr;
 323         struct ib_sge                rx_sg;
 324         struct ib_cqe                cqe;
 325         char                         pad[ISER_RX_PAD_SIZE];
 326 } __packed;
 327
 328 /**
 329  * struct iser_login_desc - iSER login descriptor
 330  *
 331  * @req:           pointer to login request buffer
 332  * @resp:          pointer to login response buffer
 333  * @req_dma:       DMA address of login request buffer
 334  * @rsp_dma:      DMA address of login response buffer
 335  * @sge:           IB sge for login post recv
 336  * @cqe:           completion handler
 337  */
 338 struct iser_login_desc {
 339         void                         *req;
 340         void                         *rsp;
 341         u64                          req_dma;
 342         u64                          rsp_dma;
 343         struct ib_sge                sge;
 344         struct ib_cqe                cqe;
 345 } __attribute__((packed));
 346
 347 struct iser_conn;
 348 struct ib_conn;
 349 struct iscsi_iser_task;
 350
 351 /**
 352  * struct iser_comp - iSER completion context
 353  *
 354  * @cq:         completion queue
 355  * @active_qps: Number of active QPs attached
 356  *              to completion context
 357  */
 358 struct iser_comp {
 359         struct ib_cq            *cq;
 360         int                      active_qps;
 361 };
 362
 363 /**
 364  * struct iser_device - Memory registration operations
 365  *     per-device registration schemes
 366  *
 367  * @alloc_reg_res:     Allocate registration resources
 368  * @free_reg_res:      Free registration resources
 369  * @fast_reg_mem:      Register memory buffers
 370  * @unreg_mem:         Un-register memory buffers
 371  * @reg_desc_get:      Get a registration descriptor for pool
 372  * @reg_desc_put:      Get a registration descriptor to pool
 373  */
 374 struct iser_reg_ops {
 375         int            (*alloc_reg_res)(struct ib_conn *ib_conn,
 376                                         unsigned cmds_max,
 377                                         unsigned int size);
 378         void           (*free_reg_res)(struct ib_conn *ib_conn);
 379         int            (*reg_mem)(struct iscsi_iser_task *iser_task,
 380                                   struct iser_data_buf *mem,
 381                                   struct iser_reg_resources *rsc,
 382                                   struct iser_mem_reg *reg);
 383         void           (*unreg_mem)(struct iscsi_iser_task *iser_task,
 384                                     enum iser_data_dir cmd_dir);
 385         struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
 386         void           (*reg_desc_put)(struct ib_conn *ib_conn,
 387                                        struct iser_fr_desc *desc);
 388 };
 389
 390 /**
 391  * struct iser_device - iSER device handle
 392  *
 393  * @ib_device:     RDMA device
 394  * @pd:            Protection Domain for this device
 395  * @mr:            Global DMA memory region
 396  * @event_handler: IB events handle routine
 397  * @ig_list:       entry in devices list
 398  * @refcount:      Reference counter, dominated by open iser connections
 399  * @comps_used:    Number of completion contexts used, Min between online
 400  *                 cpus and device max completion vectors
 401  * @comps:         Dinamically allocated array of completion handlers
 402  * @reg_ops:       Registration ops
 403  */
 404 struct iser_device {
 405         struct ib_device             *ib_device;
 406         struct ib_pd                 *pd;
 407         struct ib_mr                 *mr;
 408         struct ib_event_handler      event_handler;
 409         struct list_head             ig_list;
 410         int                          refcount;
 411         int                          comps_used;
 412         struct iser_comp             *comps;
 413         struct iser_reg_ops          *reg_ops;
 414 };
 415
 416 #define ISER_CHECK_GUARD        0xc0
 417 #define ISER_CHECK_REFTAG       0x0f
 418 #define ISER_CHECK_APPTAG       0x30
 419
 420 /**
 421  * struct iser_reg_resources - Fast registration recources
 422  *
 423  * @mr:         memory region
 424  * @fmr_pool:   pool of fmrs
 425  * @page_vec:   fast reg page list used by fmr pool
 426  * @mr_valid:   is mr valid indicator
 427  */
 428 struct iser_reg_resources {
 429         union {
 430                 struct ib_mr             *mr;
 431                 struct ib_fmr_pool       *fmr_pool;
 432         };
 433         struct iser_page_vec             *page_vec;
 434         u8                                mr_valid:1;
 435 };
 436
 437 /**
 438  * struct iser_pi_context - Protection information context
 439  *
 440  * @rsc:             protection buffer registration resources
 441  * @sig_mr:          signature enable memory region
 442  * @sig_mr_valid:    is sig_mr valid indicator
 443  * @sig_protected:   is region protected indicator
 444  */
 445 struct iser_pi_context {
 446         struct iser_reg_resources       rsc;
 447         struct ib_mr                   *sig_mr;
 448         u8                              sig_mr_valid:1;
 449         u8                              sig_protected:1;
 450 };
 451
 452 /**
 453  * struct iser_fr_desc - Fast registration descriptor
 454  *
 455  * @list:           entry in connection fastreg pool
 456  * @rsc:            data buffer registration resources
 457  * @pi_ctx:         protection information context
 458  */
 459 struct iser_fr_desc {
 460         struct list_head                  list;
 461         struct iser_reg_resources         rsc;
 462         struct iser_pi_context           *pi_ctx;
 463 };
 464
 465 /**
 466  * struct iser_fr_pool: connection fast registration pool
 467  *
 468  * @list:                list of fastreg descriptors
 469  * @lock:                protects fmr/fastreg pool
 470  * @size:                size of the pool
 471  */
 472 struct iser_fr_pool {
 473         struct list_head        list;
 474         spinlock_t              lock;
 475         int                     size;
 476 };
 477
 478 /**
 479  * struct ib_conn - Infiniband related objects
 480  *
 481  * @cma_id:              rdma_cm connection maneger handle
 482  * @qp:                  Connection Queue-pair
 483  * @post_recv_buf_count: post receive counter
 484  * @sig_count:           send work request signal count
 485  * @rx_wr:               receive work request for batch posts
 486  * @device:              reference to iser device
 487  * @comp:                iser completion context
 488  * @fr_pool:             connection fast registration poool
 489  * @pi_support:          Indicate device T10-PI support
 490  * @last:                last send wr to signal all flush errors were drained
 491  * @last_cqe:            cqe handler for last wr
 492  * @last_comp:           completes when all connection completions consumed
 493  */
 494 struct ib_conn {
 495         struct rdma_cm_id           *cma_id;
 496         struct ib_qp                *qp;
 497         int                          post_recv_buf_count;
 498         u8                           sig_count;
 499         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 500         struct iser_device          *device;
 501         struct iser_comp            *comp;
 502         struct iser_fr_pool          fr_pool;
 503         bool                         pi_support;
 504         struct ib_send_wr            last;
 505         struct ib_cqe                last_cqe;
 506         struct ib_cqe                reg_cqe;
 507         struct completion            last_comp;
 508 };
 509
 510 /**
 511  * struct iser_conn - iSER connection context
 512  *
 513  * @ib_conn:          connection RDMA resources
 514  * @iscsi_conn:       link to matching iscsi connection
 515  * @ep:               transport handle
 516  * @state:            connection logical state
 517  * @qp_max_recv_dtos: maximum number of data outs, corresponds
 518  *                    to max number of post recvs
 519  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 520  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 521  * @max_cmds:         maximum cmds allowed for this connection
 522  * @name:             connection peer portal
 523  * @release_work:     deffered work for release job
 524  * @state_mutex:      protects iser onnection state
 525  * @stop_completion:  conn_stop completion
 526  * @ib_completion:    RDMA cleanup completion
 527  * @up_completion:    connection establishment completed
 528  *                    (state is ISER_CONN_UP)
 529  * @conn_list:        entry in ig conn list
 530  * @login_desc:       login descriptor
 531  * @rx_desc_head:     head of rx_descs cyclic buffer
 532  * @rx_descs:         rx buffers array (cyclic buffer)
 533  * @num_rx_descs:     number of rx descriptors
 534  * @scsi_sg_tablesize: scsi host sg_tablesize
 535  * @scsi_max_sectors: scsi host max sectors
 536  */
 537 struct iser_conn {
 538         struct ib_conn               ib_conn;
 539         struct iscsi_conn            *iscsi_conn;
 540         struct iscsi_endpoint        *ep;
 541         enum iser_conn_state         state;
 542         unsigned                     qp_max_recv_dtos;
 543         unsigned                     qp_max_recv_dtos_mask;
 544         unsigned                     min_posted_rx;
 545         u16                          max_cmds;
 546         char                         name[ISER_OBJECT_NAME_SIZE];
 547         struct work_struct           release_work;
 548         struct mutex                 state_mutex;
 549         struct completion            stop_completion;
 550         struct completion            ib_completion;
 551         struct completion            up_completion;
 552         struct list_head             conn_list;
 553         struct iser_login_desc       login_desc;
 554         unsigned int                 rx_desc_head;
 555         struct iser_rx_desc          *rx_descs;
 556         u32                          num_rx_descs;
 557         unsigned short               scsi_sg_tablesize;
 558         unsigned int                 scsi_max_sectors;
 559 };
 560
 561 /**
 562  * struct iscsi_iser_task - iser task context
 563  *
 564  * @desc:     TX descriptor
 565  * @iser_conn:        link to iser connection
 566  * @status:           current task status
 567  * @sc:               link to scsi command
 568  * @command_sent:     indicate if command was sent
 569  * @dir:              iser data direction
 570  * @rdma_reg:         task rdma registration desc
 571  * @data:             iser data buffer desc
 572  * @prot:             iser protection buffer desc
 573  */
 574 struct iscsi_iser_task {
 575         struct iser_tx_desc          desc;
 576         struct iser_conn             *iser_conn;
 577         enum iser_task_status        status;
 578         struct scsi_cmnd             *sc;
 579         int                          command_sent;
 580         int                          dir[ISER_DIRS_NUM];
 581         struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 582         struct iser_data_buf         data[ISER_DIRS_NUM];
 583         struct iser_data_buf         prot[ISER_DIRS_NUM];
 584 };
 585
 586 struct iser_page_vec {
 587         u64 *pages;
 588         int length;
 589         int offset;
 590         int data_size;
 591 };
 592
 593 /**
 594  * struct iser_global: iSER global context
 595  *
 596  * @device_list_mutex:    protects device_list
 597  * @device_list:          iser devices global list
 598  * @connlist_mutex:       protects connlist
 599  * @connlist:             iser connections global list
 600  * @desc_cache:           kmem cache for tx dataout
 601  */
 602 struct iser_global {
 603         struct mutex      device_list_mutex;
 604         struct list_head  device_list;
 605         struct mutex      connlist_mutex;
 606         struct list_head  connlist;
 607         struct kmem_cache *desc_cache;
 608 };
 609
 610 extern struct iser_global ig;
 611 extern int iser_debug_level;
 612 extern bool iser_pi_enable;
 613 extern int iser_pi_guard;
 614 extern unsigned int iser_max_sectors;
 615 extern bool iser_always_reg;
 616
 617 int iser_assign_reg_ops(struct iser_device *device);
 618
 619 int iser_send_control(struct iscsi_conn *conn,
 620                       struct iscsi_task *task);
 621
 622 int iser_send_command(struct iscsi_conn *conn,
 623                       struct iscsi_task *task);
 624
 625 int iser_send_data_out(struct iscsi_conn *conn,
 626                        struct iscsi_task *task,
 627                        struct iscsi_data *hdr);
 628
 629 void iscsi_iser_recv(struct iscsi_conn *conn,
 630                      struct iscsi_hdr *hdr,
 631                      char *rx_data,
 632                      int rx_data_len);
 633
 634 void iser_conn_init(struct iser_conn *iser_conn);
 635
 636 void iser_conn_release(struct iser_conn *iser_conn);
 637
 638 int iser_conn_terminate(struct iser_conn *iser_conn);
 639
 640 void iser_release_work(struct work_struct *work);
 641
 642 void iser_err_comp(struct ib_wc *wc, const char *type);
 643 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
 644 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
 645 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
 646 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
 647 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
 648 void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
 649 void iser_last_comp(struct ib_cq *cq, struct ib_wc *wc);
 650
 651 void iser_task_rdma_init(struct iscsi_iser_task *task);
 652
 653 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 654
 655 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 656
 657 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 658                                      struct iser_data_buf *mem,
 659                                      enum iser_data_dir cmd_dir);
 660
 661 int iser_reg_rdma_mem(struct iscsi_iser_task *task,
 662                       enum iser_data_dir dir);
 663 void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
 664                          enum iser_data_dir dir);
 665
 666 int  iser_connect(struct iser_conn *iser_conn,
 667                   struct sockaddr *src_addr,
 668                   struct sockaddr *dst_addr,
 669                   int non_blocking);
 670
 671 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 672                         enum iser_data_dir cmd_dir);
 673 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 674                             enum iser_data_dir cmd_dir);
 675
 676 int  iser_post_recvl(struct iser_conn *iser_conn);
 677 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 678 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 679                     bool signal);
 680
 681 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 682                            struct iser_data_buf *data,
 683                            enum iser_data_dir iser_dir,
 684                            enum dma_data_direction dma_dir);
 685
 686 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 687                               struct iser_data_buf *data,
 688                               enum dma_data_direction dir);
 689
 690 int  iser_initialize_task_headers(struct iscsi_task *task,
 691                         struct iser_tx_desc *tx_desc);
 692 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 693                               struct iscsi_session *session);
 694 int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
 695                         unsigned cmds_max,
 696                         unsigned int size);
 697 void iser_free_fmr_pool(struct ib_conn *ib_conn);
 698 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
 699                             unsigned cmds_max,
 700                             unsigned int size);
 701 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 702 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 703                              enum iser_data_dir cmd_dir, sector_t *sector);
 704 struct iser_fr_desc *
 705 iser_reg_desc_get_fr(struct ib_conn *ib_conn);
 706 void
 707 iser_reg_desc_put_fr(struct ib_conn *ib_conn,
 708                      struct iser_fr_desc *desc);
 709 struct iser_fr_desc *
 710 iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
 711 void
 712 iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
 713                       struct iser_fr_desc *desc);
 714
 715 static inline struct ib_send_wr *
 716 iser_tx_next_wr(struct iser_tx_desc *tx_desc)
 717 {
 718         struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send;
 719         struct ib_send_wr *last_wr;
 720
 721         if (tx_desc->wr_idx) {
 722                 last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send;
 723                 last_wr->next = cur_wr;
 724         }
 725         tx_desc->wr_idx++;
 726
 727         return cur_wr;
 728 }
 729
 730 static inline struct iser_conn *
 731 to_iser_conn(struct ib_conn *ib_conn)
 732 {
 733         return container_of(ib_conn, struct iser_conn, ib_conn);
 734 }
 735
 736 static inline struct iser_rx_desc *
 737 iser_rx(struct ib_cqe *cqe)
 738 {
 739         return container_of(cqe, struct iser_rx_desc, cqe);
 740 }
 741
 742 static inline struct iser_tx_desc *
 743 iser_tx(struct ib_cqe *cqe)
 744 {
 745         return container_of(cqe, struct iser_tx_desc, cqe);
 746 }
 747
 748 static inline struct iser_login_desc *
 749 iser_login(struct ib_cqe *cqe)
 750 {
 751         return container_of(cqe, struct iser_login_desc, cqe);
 752 }
 753
 754 #endif