drivers/infiniband/ulp/srpt/ib_srpt.h

   1 /*
   2  * Copyright (c) 2006 - 2009 Mellanox Technology Inc.  All rights reserved.
   3  * Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  *
  33  */
  34
  35 #ifndef IB_SRPT_H
  36 #define IB_SRPT_H
  37
  38 #include <linux/types.h>
  39 #include <linux/list.h>
  40 #include <linux/wait.h>
  41
  42 #include <rdma/ib_verbs.h>
  43 #include <rdma/ib_sa.h>
  44 #include <rdma/ib_cm.h>
  45 #include <rdma/rw.h>
  46
  47 #include <scsi/srp.h>
  48
  49 #include "ib_dm_mad.h"
  50
  51 /*
  52  * The prefix the ServiceName field must start with in the device management
  53  * ServiceEntries attribute pair. See also the SRP specification.
  54  */
  55 #define SRP_SERVICE_NAME_PREFIX         "SRP.T10:"
  56
  57 enum {
  58         /*
  59          * SRP IOControllerProfile attributes for SRP target ports that have
  60          * not been defined in <scsi/srp.h>. Source: section B.7, table B.7
  61          * in the SRP specification.
  62          */
  63         SRP_PROTOCOL = 0x0108,
  64         SRP_PROTOCOL_VERSION = 0x0001,
  65         SRP_IO_SUBCLASS = 0x609e,
  66         SRP_SEND_TO_IOC = 0x01,
  67         SRP_SEND_FROM_IOC = 0x02,
  68         SRP_RDMA_READ_FROM_IOC = 0x08,
  69         SRP_RDMA_WRITE_FROM_IOC = 0x20,
  70
  71         /*
  72          * srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
  73          * specification.
  74          */
  75         SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
  76         SRP_LOSOLNT = 0x10, /* logout solicited notification */
  77         SRP_CRSOLNT = 0x20, /* credit request solicited notification */
  78         SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */
  79
  80         /*
  81          * srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
  82          * 18 and 20 in the SRP specification.
  83          */
  84         SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
  85         SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */
  86
  87         /*
  88          * srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
  89          * 16 and 22 in the SRP specification.
  90          */
  91         SRP_SOLNT = 0x01, /* SOLNT = solicited notification */
  92
  93         /* See also table 24 in the SRP specification. */
  94         SRP_TSK_MGMT_SUCCESS = 0x00,
  95         SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
  96         SRP_TSK_MGMT_FAILED = 0x05,
  97
  98         /* See also table 21 in the SRP specification. */
  99         SRP_CMD_SIMPLE_Q = 0x0,
 100         SRP_CMD_HEAD_OF_Q = 0x1,
 101         SRP_CMD_ORDERED_Q = 0x2,
 102         SRP_CMD_ACA = 0x4,
 103
 104         SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
 105         SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
 106         SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
 107
 108         SRPT_DEF_SG_TABLESIZE = 128,
 109         /*
 110          * An experimentally determined value that avoids that QP creation
 111          * fails due to "swiotlb buffer is full" on systems using the swiotlb.
 112          */
 113         SRPT_MAX_SG_PER_WQE = 16,
 114
 115         MIN_SRPT_SQ_SIZE = 16,
 116         DEF_SRPT_SQ_SIZE = 4096,
 117         SRPT_RQ_SIZE = 128,
 118         MIN_SRPT_SRQ_SIZE = 4,
 119         DEFAULT_SRPT_SRQ_SIZE = 4095,
 120         MAX_SRPT_SRQ_SIZE = 65535,
 121         MAX_SRPT_RDMA_SIZE = 1U << 24,
 122         MAX_SRPT_RSP_SIZE = 1024,
 123
 124         MIN_MAX_REQ_SIZE = 996,
 125         DEFAULT_MAX_REQ_SIZE
 126                 = sizeof(struct srp_cmd)/*48*/
 127                 + sizeof(struct srp_indirect_buf)/*20*/
 128                 + 128 * sizeof(struct srp_direct_buf)/*16*/,
 129
 130         MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
 131         DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */
 132
 133         DEFAULT_MAX_RDMA_SIZE = 65536,
 134 };
 135
 136 /**
 137  * enum srpt_command_state - SCSI command state managed by SRPT.
 138  * @SRPT_STATE_NEW:           New command arrived and is being processed.
 139  * @SRPT_STATE_NEED_DATA:     Processing a write or bidir command and waiting
 140  *                            for data arrival.
 141  * @SRPT_STATE_DATA_IN:       Data for the write or bidir command arrived and is
 142  *                            being processed.
 143  * @SRPT_STATE_CMD_RSP_SENT:  SRP_RSP for SRP_CMD has been sent.
 144  * @SRPT_STATE_MGMT:          Processing a SCSI task management command.
 145  * @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
 146  * @SRPT_STATE_DONE:          Command processing finished successfully, command
 147  *                            processing has been aborted or command processing
 148  *                            failed.
 149  */
 150 enum srpt_command_state {
 151         SRPT_STATE_NEW           = 0,
 152         SRPT_STATE_NEED_DATA     = 1,
 153         SRPT_STATE_DATA_IN       = 2,
 154         SRPT_STATE_CMD_RSP_SENT  = 3,
 155         SRPT_STATE_MGMT          = 4,
 156         SRPT_STATE_MGMT_RSP_SENT = 5,
 157         SRPT_STATE_DONE          = 6,
 158 };
 159
 160 /**
 161  * struct srpt_ioctx - Shared SRPT I/O context information.
 162  * @buf:   Pointer to the buffer.
 163  * @dma:   DMA address of the buffer.
 164  * @index: Index of the I/O context in its ioctx_ring array.
 165  */
 166 struct srpt_ioctx {
 167         struct ib_cqe           cqe;
 168         void                    *buf;
 169         dma_addr_t              dma;
 170         uint32_t                index;
 171 };
 172
 173 /**
 174  * struct srpt_recv_ioctx - SRPT receive I/O context.
 175  * @ioctx:     See above.
 176  * @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
 177  */
 178 struct srpt_recv_ioctx {
 179         struct srpt_ioctx       ioctx;
 180         struct list_head        wait_list;
 181 };
 182
 183 struct srpt_rw_ctx {
 184         struct rdma_rw_ctx      rw;
 185         struct scatterlist      *sg;
 186         unsigned int            nents;
 187 };
 188
 189 /**
 190  * struct srpt_send_ioctx - SRPT send I/O context.
 191  * @ioctx:       See above.
 192  * @ch:          Channel pointer.
 193  * @spinlock:    Protects 'state'.
 194  * @state:       I/O context state.
 195  * @cmd:         Target core command data structure.
 196  * @sense_data:  SCSI sense data.
 197  */
 198 struct srpt_send_ioctx {
 199         struct srpt_ioctx       ioctx;
 200         struct srpt_rdma_ch     *ch;
 201
 202         struct srpt_rw_ctx      s_rw_ctx;
 203         struct srpt_rw_ctx      *rw_ctxs;
 204
 205         struct ib_cqe           rdma_cqe;
 206         struct list_head        free_list;
 207         spinlock_t              spinlock;
 208         enum srpt_command_state state;
 209         struct se_cmd           cmd;
 210         struct completion       tx_done;
 211         u8                      n_rdma;
 212         u8                      n_rw_ctx;
 213         bool                    queue_status_only;
 214         u8                      sense_data[TRANSPORT_SENSE_BUFFER];
 215 };
 216
 217 /**
 218  * enum rdma_ch_state - SRP channel state.
 219  * @CH_CONNECTING:    QP is in RTR state; waiting for RTU.
 220  * @CH_LIVE:          QP is in RTS state.
 221  * @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
 222  *                    been received.
 223  * @CH_DRAINING:      DREP has been received or waiting for DREP timed out
 224  *                    and last work request has been queued.
 225  * @CH_DISCONNECTED:  Last completion has been received.
 226  */
 227 enum rdma_ch_state {
 228         CH_CONNECTING,
 229         CH_LIVE,
 230         CH_DISCONNECTING,
 231         CH_DRAINING,
 232         CH_DISCONNECTED,
 233 };
 234
 235 /**
 236  * struct srpt_rdma_ch - RDMA channel.
 237  * @cm_id:         IB CM ID associated with the channel.
 238  * @qp:            IB queue pair used for communicating over this channel.
 239  * @cq:            IB completion queue for this channel.
 240  * @rq_size:       IB receive queue size.
 241  * @rsp_size       IB response message size in bytes.
 242  * @sq_wr_avail:   number of work requests available in the send queue.
 243  * @sport:         pointer to the information of the HCA port used by this
 244  *                 channel.
 245  * @i_port_id:     128-bit initiator port identifier copied from SRP_LOGIN_REQ.
 246  * @t_port_id:     128-bit target port identifier copied from SRP_LOGIN_REQ.
 247  * @max_ti_iu_len: maximum target-to-initiator information unit length.
 248  * @req_lim:       request limit: maximum number of requests that may be sent
 249  *                 by the initiator without having received a response.
 250  * @req_lim_delta: Number of credits not yet sent back to the initiator.
 251  * @spinlock:      Protects free_list and state.
 252  * @free_list:     Head of list with free send I/O contexts.
 253  * @state:         channel state. See also enum rdma_ch_state.
 254  * @ioctx_ring:    Send ring.
 255  * @list:          Node for insertion in the srpt_device.rch_list list.
 256  * @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
 257  *                 list contains struct srpt_ioctx elements and is protected
 258  *                 against concurrent modification by the cm_id spinlock.
 259  * @sess:          Session information associated with this SRP channel.
 260  * @sess_name:     Session name.
 261  * @release_work:  Allows scheduling of srpt_release_channel().
 262  * @release_done:  Enables waiting for srpt_release_channel() completion.
 263  */
 264 struct srpt_rdma_ch {
 265         struct ib_cm_id         *cm_id;
 266         struct ib_qp            *qp;
 267         struct ib_cq            *cq;
 268         struct ib_cqe           zw_cqe;
 269         struct kref             kref;
 270         int                     rq_size;
 271         u32                     rsp_size;
 272         atomic_t                sq_wr_avail;
 273         struct srpt_port        *sport;
 274         u8                      i_port_id[16];
 275         u8                      t_port_id[16];
 276         int                     max_ti_iu_len;
 277         atomic_t                req_lim;
 278         atomic_t                req_lim_delta;
 279         spinlock_t              spinlock;
 280         struct list_head        free_list;
 281         enum rdma_ch_state      state;
 282         struct srpt_send_ioctx  **ioctx_ring;
 283         struct list_head        list;
 284         struct list_head        cmd_wait_list;
 285         struct se_session       *sess;
 286         u8                      sess_name[36];
 287         struct work_struct      release_work;
 288         struct completion       *release_done;
 289 };
 290
 291 /**
 292  * struct srpt_port_attib - Attributes for SRPT port
 293  * @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
 294  * @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
 295  * @srp_sq_size: Shared receive queue (SRQ) size.
 296  */
 297 struct srpt_port_attrib {
 298         u32                     srp_max_rdma_size;
 299         u32                     srp_max_rsp_size;
 300         u32                     srp_sq_size;
 301 };
 302
 303 /**
 304  * struct srpt_port - Information associated by SRPT with a single IB port.
 305  * @sdev:      backpointer to the HCA information.
 306  * @mad_agent: per-port management datagram processing information.
 307  * @enabled:   Whether or not this target port is enabled.
 308  * @port_guid: ASCII representation of Port GUID
 309  * @port:      one-based port number.
 310  * @sm_lid:    cached value of the port's sm_lid.
 311  * @lid:       cached value of the port's lid.
 312  * @gid:       cached value of the port's gid.
 313  * @port_acl_lock spinlock for port_acl_list:
 314  * @work:      work structure for refreshing the aforementioned cached values.
 315  * @port_tpg_1 Target portal group = 1 data.
 316  * @port_wwn:  Target core WWN data.
 317  * @port_acl_list: Head of the list with all node ACLs for this port.
 318  */
 319 struct srpt_port {
 320         struct srpt_device      *sdev;
 321         struct ib_mad_agent     *mad_agent;
 322         bool                    enabled;
 323         u8                      port_guid[64];
 324         u8                      port;
 325         u16                     sm_lid;
 326         u16                     lid;
 327         union ib_gid            gid;
 328         struct work_struct      work;
 329         struct se_portal_group  port_tpg_1;
 330         struct se_wwn           port_wwn;
 331         struct srpt_port_attrib port_attrib;
 332 };
 333
 334 /**
 335  * struct srpt_device - Information associated by SRPT with a single HCA.
 336  * @device:        Backpointer to the struct ib_device managed by the IB core.
 337  * @pd:            IB protection domain.
 338  * @mr:            L_Key (local key) with write access to all local memory.
 339  * @srq:           Per-HCA SRQ (shared receive queue).
 340  * @cm_id:         Connection identifier.
 341  * @srq_size:      SRQ size.
 342  * @ioctx_ring:    Per-HCA SRQ.
 343  * @rch_list:      Per-device channel list -- see also srpt_rdma_ch.list.
 344  * @ch_releaseQ:   Enables waiting for removal from rch_list.
 345  * @mutex:         Protects rch_list.
 346  * @port:          Information about the ports owned by this HCA.
 347  * @event_handler: Per-HCA asynchronous IB event handler.
 348  * @list:          Node in srpt_dev_list.
 349  */
 350 struct srpt_device {
 351         struct ib_device        *device;
 352         struct ib_pd            *pd;
 353         struct ib_srq           *srq;
 354         struct ib_cm_id         *cm_id;
 355         int                     srq_size;
 356         struct srpt_recv_ioctx  **ioctx_ring;
 357         struct list_head        rch_list;
 358         wait_queue_head_t       ch_releaseQ;
 359         struct mutex            mutex;
 360         struct srpt_port        port[2];
 361         struct ib_event_handler event_handler;
 362         struct list_head        list;
 363 };
 364
 365 #endif                          /* IB_SRPT_H */