LXR linux/drivers/infiniband/ulp/iser/iscsi

   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
 167enum 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
 176enum iser_task_status {
 177        ISER_TASK_STATUS_INIT = 0,
 178        ISER_TASK_STATUS_STARTED,
 179        ISER_TASK_STATUS_COMPLETED
 180};
 181
 182enum 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 */
 196struct 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 */
 204struct iser_device;
 205struct iscsi_iser_task;
 206struct iscsi_endpoint;
 207struct 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 */
 216struct iser_mem_reg {
 217        struct ib_sge    sge;
 218        u32              rkey;
 219        void            *mem_h;
 220};
 221
 222enum 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 */
 254struct 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 */
 287struct 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 */
 307struct 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
 316struct iser_conn;
 317struct ib_conn;
 318struct 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 */
 327struct 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 */
 343struct 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 */
 374struct iser_device {
 375        struct ib_device             *ib_device;
 376        struct ib_pd                 *pd;
 377        struct ib_mr                 *mr;
 378        struct ib_event_handler      event_handler;
 379        struct list_head             ig_list;
 380        int                          refcount;
 381        int                          comps_used;
 382        struct iser_comp             *comps;
 383        const struct iser_reg_ops    *reg_ops;
 384        bool                         remote_inv_sup;
 385};
 386
 387#define ISER_CHECK_GUARD        0xc0
 388#define ISER_CHECK_REFTAG       0x0f
 389#define ISER_CHECK_APPTAG       0x30
 390
 391/**
 392 * struct iser_reg_resources - Fast registration recources
 393 *
 394 * @mr:         memory region
 395 * @fmr_pool:   pool of fmrs
 396 * @page_vec:   fast reg page list used by fmr pool
 397 * @mr_valid:   is mr valid indicator
 398 */
 399struct iser_reg_resources {
 400        union {
 401                struct ib_mr             *mr;
 402                struct ib_fmr_pool       *fmr_pool;
 403        };
 404        struct iser_page_vec             *page_vec;
 405        u8                                mr_valid:1;
 406};
 407
 408/**
 409 * struct iser_pi_context - Protection information context
 410 *
 411 * @rsc:             protection buffer registration resources
 412 * @sig_mr:          signature enable memory region
 413 * @sig_mr_valid:    is sig_mr valid indicator
 414 * @sig_protected:   is region protected indicator
 415 */
 416struct iser_pi_context {
 417        struct iser_reg_resources       rsc;
 418        struct ib_mr                   *sig_mr;
 419        u8                              sig_mr_valid:1;
 420        u8                              sig_protected:1;
 421};
 422
 423/**
 424 * struct iser_fr_desc - Fast registration descriptor
 425 *
 426 * @list:           entry in connection fastreg pool
 427 * @rsc:            data buffer registration resources
 428 * @pi_ctx:         protection information context
 429 */
 430struct iser_fr_desc {
 431        struct list_head                  list;
 432        struct iser_reg_resources         rsc;
 433        struct iser_pi_context           *pi_ctx;
 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 */
 443struct iser_fr_pool {
 444        struct list_head        list;
 445        spinlock_t              lock;
 446        int                     size;
 447};
 448
 449/**
 450 * struct ib_conn - Infiniband related objects
 451 *
 452 * @cma_id:              rdma_cm connection maneger handle
 453 * @qp:                  Connection Queue-pair
 454 * @post_recv_buf_count: post receive counter
 455 * @sig_count:           send work request signal count
 456 * @rx_wr:               receive work request for batch posts
 457 * @device:              reference to iser device
 458 * @comp:                iser completion context
 459 * @fr_pool:             connection fast registration poool
 460 * @pi_support:          Indicate device T10-PI support
 461 */
 462struct ib_conn {
 463        struct rdma_cm_id           *cma_id;
 464        struct ib_qp                *qp;
 465        int                          post_recv_buf_count;
 466        u8                           sig_count;
 467        struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 468        struct iser_device          *device;
 469        struct iser_comp            *comp;
 470        struct iser_fr_pool          fr_pool;
 471        bool                         pi_support;
 472        struct ib_cqe                reg_cqe;
 473};
 474
 475/**
 476 * struct iser_conn - iSER connection context
 477 *
 478 * @ib_conn:          connection RDMA resources
 479 * @iscsi_conn:       link to matching iscsi connection
 480 * @ep:               transport handle
 481 * @state:            connection logical state
 482 * @qp_max_recv_dtos: maximum number of data outs, corresponds
 483 *                    to max number of post recvs
 484 * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
 485 * @min_posted_rx:    (qp_max_recv_dtos >> 2)
 486 * @max_cmds:         maximum cmds allowed for this connection
 487 * @name:             connection peer portal
 488 * @release_work:     deffered work for release job
 489 * @state_mutex:      protects iser onnection state
 490 * @stop_completion:  conn_stop completion
 491 * @ib_completion:    RDMA cleanup completion
 492 * @up_completion:    connection establishment completed
 493 *                    (state is ISER_CONN_UP)
 494 * @conn_list:        entry in ig conn list
 495 * @login_desc:       login descriptor
 496 * @rx_desc_head:     head of rx_descs cyclic buffer
 497 * @rx_descs:         rx buffers array (cyclic buffer)
 498 * @num_rx_descs:     number of rx descriptors
 499 * @scsi_sg_tablesize: scsi host sg_tablesize
 500 * @scsi_max_sectors: scsi host max sectors
 501 */
 502struct 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        unsigned int                 scsi_max_sectors;
 524        bool                         snd_w_inv;
 525};
 526
 527/**
 528 * struct iscsi_iser_task - iser task context
 529 *
 530 * @desc:     TX descriptor
 531 * @iser_conn:        link to iser connection
 532 * @status:           current task status
 533 * @sc:               link to scsi command
 534 * @command_sent:     indicate if command was sent
 535 * @dir:              iser data direction
 536 * @rdma_reg:         task rdma registration desc
 537 * @data:             iser data buffer desc
 538 * @prot:             iser protection buffer desc
 539 */
 540struct iscsi_iser_task {
 541        struct iser_tx_desc          desc;
 542        struct iser_conn             *iser_conn;
 543        enum iser_task_status        status;
 544        struct scsi_cmnd             *sc;
 545        int                          command_sent;
 546        int                          dir[ISER_DIRS_NUM];
 547        struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
 548        struct iser_data_buf         data[ISER_DIRS_NUM];
 549        struct iser_data_buf         prot[ISER_DIRS_NUM];
 550};
 551
 552struct iser_page_vec {
 553        u64 *pages;
 554        int npages;
 555        struct ib_mr fake_mr;
 556};
 557
 558/**
 559 * struct iser_global: iSER global context
 560 *
 561 * @device_list_mutex:    protects device_list
 562 * @device_list:          iser devices global list
 563 * @connlist_mutex:       protects connlist
 564 * @connlist:             iser connections global list
 565 * @desc_cache:           kmem cache for tx dataout
 566 */
 567struct iser_global {
 568        struct mutex      device_list_mutex;
 569        struct list_head  device_list;
 570        struct mutex      connlist_mutex;
 571        struct list_head  connlist;
 572        struct kmem_cache *desc_cache;
 573};
 574
 575extern struct iser_global ig;
 576extern int iser_debug_level;
 577extern bool iser_pi_enable;
 578extern int iser_pi_guard;
 579extern unsigned int iser_max_sectors;
 580extern bool iser_always_reg;
 581
 582int iser_assign_reg_ops(struct iser_device *device);
 583
 584int iser_send_control(struct iscsi_conn *conn,
 585                      struct iscsi_task *task);
 586
 587int iser_send_command(struct iscsi_conn *conn,
 588                      struct iscsi_task *task);
 589
 590int iser_send_data_out(struct iscsi_conn *conn,
 591                       struct iscsi_task *task,
 592                       struct iscsi_data *hdr);
 593
 594void iscsi_iser_recv(struct iscsi_conn *conn,
 595                     struct iscsi_hdr *hdr,
 596                     char *rx_data,
 597                     int rx_data_len);
 598
 599void iser_conn_init(struct iser_conn *iser_conn);
 600
 601void iser_conn_release(struct iser_conn *iser_conn);
 602
 603int iser_conn_terminate(struct iser_conn *iser_conn);
 604
 605void iser_release_work(struct work_struct *work);
 606
 607void iser_err_comp(struct ib_wc *wc, const char *type);
 608void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
 609void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
 610void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
 611void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
 612void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
 613void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
 614
 615void iser_task_rdma_init(struct iscsi_iser_task *task);
 616
 617void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 618
 619void iser_free_rx_descriptors(struct iser_conn *iser_conn);
 620
 621void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
 622                                     struct iser_data_buf *mem,
 623                                     enum iser_data_dir cmd_dir);
 624
 625int iser_reg_rdma_mem(struct iscsi_iser_task *task,
 626                      enum iser_data_dir dir,
 627                      bool all_imm);
 628void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
 629                         enum iser_data_dir dir);
 630
 631int  iser_connect(struct iser_conn *iser_conn,
 632                  struct sockaddr *src_addr,
 633                  struct sockaddr *dst_addr,
 634                  int non_blocking);
 635
 636void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
 637                        enum iser_data_dir cmd_dir);
 638void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 639                            enum iser_data_dir cmd_dir);
 640
 641int  iser_post_recvl(struct iser_conn *iser_conn);
 642int  iser_post_recvm(struct iser_conn *iser_conn, int count);
 643int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 644                    bool signal);
 645
 646int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 647                           struct iser_data_buf *data,
 648                           enum iser_data_dir iser_dir,
 649                           enum dma_data_direction dma_dir);
 650
 651void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
 652                              struct iser_data_buf *data,
 653                              enum dma_data_direction dir);
 654
 655int  iser_initialize_task_headers(struct iscsi_task *task,
 656                        struct iser_tx_desc *tx_desc);
 657int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
 658                              struct iscsi_session *session);
 659int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
 660                        unsigned cmds_max,
 661                        unsigned int size);
 662void iser_free_fmr_pool(struct ib_conn *ib_conn);
 663int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
 664                            unsigned cmds_max,
 665                            unsigned int size);
 666void iser_free_fastreg_pool(struct ib_conn *ib_conn);
 667u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 668                             enum iser_data_dir cmd_dir, sector_t *sector);
 669struct iser_fr_desc *
 670iser_reg_desc_get_fr(struct ib_conn *ib_conn);
 671void
 672iser_reg_desc_put_fr(struct ib_conn *ib_conn,
 673                     struct iser_fr_desc *desc);
 674struct iser_fr_desc *
 675iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
 676void
 677iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
 678                      struct iser_fr_desc *desc);
 679
 680static inline struct ib_send_wr *
 681iser_tx_next_wr(struct iser_tx_desc *tx_desc)
 682{
 683        struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send;
 684        struct ib_send_wr *last_wr;
 685
 686        if (tx_desc->wr_idx) {
 687                last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send;
 688                last_wr->next = cur_wr;
 689        }
 690        tx_desc->wr_idx++;
 691
 692        return cur_wr;
 693}
 694
 695static inline struct iser_conn *
 696to_iser_conn(struct ib_conn *ib_conn)
 697{
 698        return container_of(ib_conn, struct iser_conn, ib_conn);
 699}
 700
 701static inline struct iser_rx_desc *
 702iser_rx(struct ib_cqe *cqe)
 703{
 704        return container_of(cqe, struct iser_rx_desc, cqe);
 705}
 706
 707static inline struct iser_tx_desc *
 708iser_tx(struct ib_cqe *cqe)
 709{
 710        return container_of(cqe, struct iser_tx_desc, cqe);
 711}
 712
 713static inline struct iser_login_desc *
 714iser_login(struct ib_cqe *cqe)
 715{
 716        return container_of(cqe, struct iser_login_desc, cqe);
 717}
 718
 719#endif
 720