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 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
  50 #include <linux/interrupt.h>
  51 #include <linux/wait.h>
  52 #include <linux/sched.h>
  53 #include <linux/list.h>
  54 #include <linux/slab.h>
  55 #include <linux/dma-mapping.h>
  56 #include <linux/mutex.h>
  57 #include <linux/mempool.h>
  58 #include <linux/uio.h>
  59
  60 #include <linux/socket.h>
  61 #include <linux/in.h>
  62 #include <linux/in6.h>
  63
  64 #include <rdma/ib_verbs.h>
  65 #include <rdma/ib_fmr_pool.h>
  66 #include <rdma/rdma_cm.h>
  67
  68 #define DRV_NAME        "iser"
  69 #define PFX             DRV_NAME ": "
  70 #define DRV_VER         "1.1"
  71
  72 #define iser_dbg(fmt, arg...)                           \
  73         do {                                            \
  74                 if (iser_debug_level > 2)               \
  75                         printk(KERN_DEBUG PFX "%s:" fmt,\
  76                                 __func__ , ## arg);     \
  77         } while (0)
  78
  79 #define iser_warn(fmt, arg...)                          \
  80         do {                                            \
  81                 if (iser_debug_level > 1)               \
  82                         pr_warn(PFX "%s:" fmt,          \
  83                                 __func__ , ## arg);     \
  84         } while (0)
  85
  86 #define iser_info(fmt, arg...)                          \
  87         do {                                            \
  88                 if (iser_debug_level > 0)               \
  89                         pr_info(PFX "%s:" fmt,          \
  90                                 __func__ , ## arg);     \
  91         } while (0)
  92
  93 #define iser_err(fmt, arg...)                           \
  94         do {                                            \
  95                 printk(KERN_ERR PFX "%s:" fmt,          \
  96                        __func__ , ## arg);              \
  97         } while (0)
  98
  99 #define SHIFT_4K        12
 100 #define SIZE_4K (1ULL << SHIFT_4K)
 101 #define MASK_4K (~(SIZE_4K-1))
 102
 103                                         /* support up to 512KB in one RDMA */
 104 #define ISCSI_ISER_SG_TABLESIZE         (0x80000 >> SHIFT_4K)
 105 #define ISER_DEF_CMD_PER_LUN            ISCSI_DEF_XMIT_CMDS_MAX
 106
 107 /* QP settings */
 108 /* Maximal bounds on received asynchronous PDUs */
 109 #define ISER_MAX_RX_MISC_PDUS           4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
 110
 111 #define ISER_MAX_TX_MISC_PDUS           6 /* NOOP_OUT(2), TEXT(1),         *
 112                                            * SCSI_TMFUNC(2), LOGOUT(1) */
 113
 114 #define ISER_QP_MAX_RECV_DTOS           (ISCSI_DEF_XMIT_CMDS_MAX)
 115
 116 #define ISER_MIN_POSTED_RX              (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
 117
 118 /* the max TX (send) WR supported by the iSER QP is defined by                 *
 119  * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 120  * to have at max for SCSI command. The tx posting & completion handling code  *
 121  * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 122  * send WR. D=8 comes from 64K/8K                                              */
 123
 124 #define ISER_INFLIGHT_DATAOUTS          8
 125
 126 #define ISER_QP_MAX_REQ_DTOS            (ISCSI_DEF_XMIT_CMDS_MAX *    \
 127                                         (1 + ISER_INFLIGHT_DATAOUTS) + \
 128                                         ISER_MAX_TX_MISC_PDUS        + \
 129                                         ISER_MAX_RX_MISC_PDUS)
 130
 131 #define ISER_VER                        0x10
 132 #define ISER_WSV                        0x08
 133 #define ISER_RSV                        0x04
 134
 135 struct iser_hdr {
 136         u8      flags;
 137         u8      rsvd[3];
 138         __be32  write_stag; /* write rkey */
 139         __be64  write_va;
 140         __be32  read_stag;  /* read rkey */
 141         __be64  read_va;
 142 } __attribute__((packed));
 143
 144
 145 #define ISER_ZBVA_NOT_SUPPORTED         0x80
 146 #define ISER_SEND_W_INV_NOT_SUPPORTED   0x40
 147
 148 struct iser_cm_hdr {
 149         u8      flags;
 150         u8      rsvd[3];
 151 } __packed;
 152
 153 /* Constant PDU lengths calculations */
 154 #define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
 155
 156 #define ISER_RECV_DATA_SEG_LEN  128
 157 #define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
 158 #define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
 159
 160 /* Length of an object name string */
 161 #define ISER_OBJECT_NAME_SIZE               64
 162
 163 enum iser_ib_conn_state {
 164         ISER_CONN_INIT,            /* descriptor allocd, no conn          */
 165         ISER_CONN_PENDING,         /* in the process of being established */
 166         ISER_CONN_UP,              /* up and running                      */
 167         ISER_CONN_TERMINATING,     /* in the process of being terminated  */
 168         ISER_CONN_DOWN,            /* shut down                           */
 169         ISER_CONN_STATES_NUM
 170 };
 171
 172 enum iser_task_status {
 173         ISER_TASK_STATUS_INIT = 0,
 174         ISER_TASK_STATUS_STARTED,
 175         ISER_TASK_STATUS_COMPLETED
 176 };
 177
 178 enum iser_data_dir {
 179         ISER_DIR_IN = 0,           /* to initiator */
 180         ISER_DIR_OUT,              /* from initiator */
 181         ISER_DIRS_NUM
 182 };
 183
 184 struct iser_data_buf {
 185         void               *buf;      /* pointer to the sg list               */
 186         unsigned int       size;      /* num entries of this sg               */
 187         unsigned long      data_len;  /* total data len                       */
 188         unsigned int       dma_nents; /* returned by dma_map_sg               */
 189         char               *copy_buf; /* allocated copy buf for SGs unaligned *
 190                                        * for rdma which are copied            */
 191         struct scatterlist sg_single; /* SG-ified clone of a non SG SC or     *
 192                                        * unaligned SG                         */
 193   };
 194
 195 /* fwd declarations */
 196 struct iser_device;
 197 struct iser_cq_desc;
 198 struct iscsi_iser_conn;
 199 struct iscsi_iser_task;
 200 struct iscsi_endpoint;
 201
 202 struct iser_mem_reg {
 203         u32  lkey;
 204         u32  rkey;
 205         u64  va;
 206         u64  len;
 207         void *mem_h;
 208         int  is_fmr;
 209 };
 210
 211 struct iser_regd_buf {
 212         struct iser_mem_reg     reg;        /* memory registration info        */
 213         void                    *virt_addr;
 214         struct iser_device      *device;    /* device->device for dma_unmap    */
 215         enum dma_data_direction direction;  /* direction for dma_unmap         */
 216         unsigned int            data_size;
 217 };
 218
 219 enum iser_desc_type {
 220         ISCSI_TX_CONTROL ,
 221         ISCSI_TX_SCSI_COMMAND,
 222         ISCSI_TX_DATAOUT
 223 };
 224
 225 struct iser_tx_desc {
 226         struct iser_hdr              iser_header;
 227         struct iscsi_hdr             iscsi_header;
 228         enum   iser_desc_type        type;
 229         u64                          dma_addr;
 230         /* sg[0] points to iser/iscsi headers, sg[1] optionally points to either
 231         of immediate data, unsolicited data-out or control (login,text) */
 232         struct ib_sge                tx_sg[2];
 233         int                          num_sge;
 234 };
 235
 236 #define ISER_RX_PAD_SIZE        (256 - (ISER_RX_PAYLOAD_SIZE + \
 237                                         sizeof(u64) + sizeof(struct ib_sge)))
 238 struct iser_rx_desc {
 239         struct iser_hdr              iser_header;
 240         struct iscsi_hdr             iscsi_header;
 241         char                         data[ISER_RECV_DATA_SEG_LEN];
 242         u64                          dma_addr;
 243         struct ib_sge                rx_sg;
 244         char                         pad[ISER_RX_PAD_SIZE];
 245 } __attribute__((packed));
 246
 247 #define ISER_MAX_CQ 4
 248
 249 struct iser_device {
 250         struct ib_device             *ib_device;
 251         struct ib_pd                 *pd;
 252         struct ib_cq                 *rx_cq[ISER_MAX_CQ];
 253         struct ib_cq                 *tx_cq[ISER_MAX_CQ];
 254         struct ib_mr                 *mr;
 255         struct tasklet_struct        cq_tasklet[ISER_MAX_CQ];
 256         struct ib_event_handler      event_handler;
 257         struct list_head             ig_list; /* entry in ig devices list */
 258         int                          refcount;
 259         int                          cq_active_qps[ISER_MAX_CQ];
 260         int                          cqs_used;
 261         struct iser_cq_desc          *cq_desc;
 262 };
 263
 264 struct iser_conn {
 265         struct iscsi_iser_conn       *iser_conn; /* iser conn for upcalls  */
 266         struct iscsi_endpoint        *ep;
 267         enum iser_ib_conn_state      state;         /* rdma connection state   */
 268         atomic_t                     refcount;
 269         spinlock_t                   lock;          /* used for state changes  */
 270         struct iser_device           *device;       /* device context          */
 271         struct rdma_cm_id            *cma_id;       /* CMA ID                  */
 272         struct ib_qp                 *qp;           /* QP                      */
 273         struct ib_fmr_pool           *fmr_pool;     /* pool of IB FMRs         */
 274         wait_queue_head_t            wait;          /* waitq for conn/disconn  */
 275         int                          post_recv_buf_count; /* posted rx count  */
 276         atomic_t                     post_send_buf_count; /* posted tx count   */
 277         char                         name[ISER_OBJECT_NAME_SIZE];
 278         struct iser_page_vec         *page_vec;     /* represents SG to fmr maps*
 279                                                      * maps serialized as tx is*/
 280         struct list_head             conn_list;       /* entry in ig conn list */
 281
 282         char                         *login_buf;
 283         char                         *login_req_buf, *login_resp_buf;
 284         u64                          login_req_dma, login_resp_dma;
 285         unsigned int                 rx_desc_head;
 286         struct iser_rx_desc          *rx_descs;
 287         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
 288 };
 289
 290 struct iscsi_iser_conn {
 291         struct iscsi_conn            *iscsi_conn;/* ptr to iscsi conn */
 292         struct iser_conn             *ib_conn;   /* iSER IB conn      */
 293 };
 294
 295 struct iscsi_iser_task {
 296         struct iser_tx_desc          desc;
 297         struct iscsi_iser_conn       *iser_conn;
 298         enum iser_task_status        status;
 299         int                          command_sent;  /* set if command  sent  */
 300         int                          dir[ISER_DIRS_NUM];      /* set if dir use*/
 301         struct iser_regd_buf         rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
 302         struct iser_data_buf         data[ISER_DIRS_NUM];     /* orig. data des*/
 303         struct iser_data_buf         data_copy[ISER_DIRS_NUM];/* contig. copy  */
 304 };
 305
 306 struct iser_page_vec {
 307         u64 *pages;
 308         int length;
 309         int offset;
 310         int data_size;
 311 };
 312
 313 struct iser_cq_desc {
 314         struct iser_device           *device;
 315         int                          cq_index;
 316 };
 317
 318 struct iser_global {
 319         struct mutex      device_list_mutex;/*                   */
 320         struct list_head  device_list;       /* all iSER devices */
 321         struct mutex      connlist_mutex;
 322         struct list_head  connlist;             /* all iSER IB connections */
 323
 324         struct kmem_cache *desc_cache;
 325 };
 326
 327 extern struct iser_global ig;
 328 extern int iser_debug_level;
 329
 330 /* allocate connection resources needed for rdma functionality */
 331 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
 332
 333 int iser_send_control(struct iscsi_conn *conn,
 334                       struct iscsi_task *task);
 335
 336 int iser_send_command(struct iscsi_conn *conn,
 337                       struct iscsi_task *task);
 338
 339 int iser_send_data_out(struct iscsi_conn *conn,
 340                        struct iscsi_task *task,
 341                        struct iscsi_data *hdr);
 342
 343 void iscsi_iser_recv(struct iscsi_conn *conn,
 344                      struct iscsi_hdr       *hdr,
 345                      char                   *rx_data,
 346                      int                    rx_data_len);
 347
 348 void iser_conn_init(struct iser_conn *ib_conn);
 349
 350 void iser_conn_get(struct iser_conn *ib_conn);
 351
 352 int iser_conn_put(struct iser_conn *ib_conn, int destroy_cma_id_allowed);
 353
 354 void iser_conn_terminate(struct iser_conn *ib_conn);
 355
 356 void iser_rcv_completion(struct iser_rx_desc *desc,
 357                          unsigned long    dto_xfer_len,
 358                         struct iser_conn *ib_conn);
 359
 360 void iser_snd_completion(struct iser_tx_desc *desc, struct iser_conn *ib_conn);
 361
 362 void iser_task_rdma_init(struct iscsi_iser_task *task);
 363
 364 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
 365
 366 void iser_free_rx_descriptors(struct iser_conn *ib_conn);
 367
 368 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
 369                                      enum iser_data_dir         cmd_dir);
 370
 371 int  iser_reg_rdma_mem(struct iscsi_iser_task *task,
 372                        enum   iser_data_dir        cmd_dir);
 373
 374 int  iser_connect(struct iser_conn   *ib_conn,
 375                   struct sockaddr_in *src_addr,
 376                   struct sockaddr_in *dst_addr,
 377                   int                non_blocking);
 378
 379 int  iser_reg_page_vec(struct iser_conn     *ib_conn,
 380                        struct iser_page_vec *page_vec,
 381                        struct iser_mem_reg  *mem_reg);
 382
 383 void iser_unreg_mem(struct iser_mem_reg *mem_reg);
 384
 385 int  iser_post_recvl(struct iser_conn *ib_conn);
 386 int  iser_post_recvm(struct iser_conn *ib_conn, int count);
 387 int  iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc);
 388
 389 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
 390                             struct iser_data_buf       *data,
 391                             enum   iser_data_dir       iser_dir,
 392                             enum   dma_data_direction  dma_dir);
 393
 394 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task);
 395 int  iser_initialize_task_headers(struct iscsi_task *task,
 396                         struct iser_tx_desc *tx_desc);
 397 int iser_alloc_rx_descriptors(struct iser_conn *ib_conn);
 398 #endif