LXR linux/drivers/infiniband/ulp/srp/ib

   1/*
   2 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#ifndef IB_SRP_H
  34#define IB_SRP_H
  35
  36#include <linux/types.h>
  37#include <linux/list.h>
  38#include <linux/mutex.h>
  39#include <linux/scatterlist.h>
  40
  41#include <scsi/scsi_host.h>
  42#include <scsi/scsi_cmnd.h>
  43
  44#include <rdma/ib_verbs.h>
  45#include <rdma/ib_sa.h>
  46#include <rdma/ib_cm.h>
  47#include <rdma/ib_fmr_pool.h>
  48
  49enum {
  50        SRP_PATH_REC_TIMEOUT_MS = 1000,
  51        SRP_ABORT_TIMEOUT_MS    = 5000,
  52
  53        SRP_PORT_REDIRECT       = 1,
  54        SRP_DLID_REDIRECT       = 2,
  55        SRP_STALE_CONN          = 3,
  56
  57        SRP_MAX_LUN             = 512,
  58        SRP_DEF_SG_TABLESIZE    = 12,
  59
  60        SRP_RQ_SHIFT            = 6,
  61        SRP_RQ_SIZE             = 1 << SRP_RQ_SHIFT,
  62        SRP_SQ_SIZE             = SRP_RQ_SIZE - 1,
  63        SRP_CQ_SIZE             = SRP_SQ_SIZE + SRP_RQ_SIZE,
  64
  65        SRP_TAG_TSK_MGMT        = 1 << (SRP_RQ_SHIFT + 1),
  66
  67        SRP_FMR_SIZE            = 256,
  68        SRP_FMR_POOL_SIZE       = 1024,
  69        SRP_FMR_DIRTY_SIZE      = SRP_FMR_POOL_SIZE / 4
  70};
  71
  72#define SRP_OP_RECV             (1 << 31)
  73
  74enum srp_target_state {
  75        SRP_TARGET_LIVE,
  76        SRP_TARGET_CONNECTING,
  77        SRP_TARGET_DEAD,
  78        SRP_TARGET_REMOVED
  79};
  80
  81enum srp_request_type {
  82        SRP_REQ_NORMAL,
  83        SRP_REQ_TASK_MGMT,
  84};
  85
  86struct srp_device {
  87        struct list_head        dev_list;
  88        struct ib_device       *dev;
  89        struct ib_pd           *pd;
  90        struct ib_mr           *mr;
  91        struct ib_fmr_pool     *fmr_pool;
  92        int                     fmr_page_shift;
  93        int                     fmr_page_size;
  94        u64                     fmr_page_mask;
  95};
  96
  97struct srp_host {
  98        struct srp_device      *srp_dev;
  99        u8                      port;
 100        struct device           dev;
 101        struct list_head        target_list;
 102        spinlock_t              target_lock;
 103        struct completion       released;
 104        struct list_head        list;
 105};
 106
 107struct srp_request {
 108        struct list_head        list;
 109        struct scsi_cmnd       *scmnd;
 110        struct srp_iu          *cmd;
 111        struct srp_iu          *tsk_mgmt;
 112        struct ib_pool_fmr     *fmr;
 113        struct completion       done;
 114        short                   index;
 115        u8                      cmd_done;
 116        u8                      tsk_status;
 117};
 118
 119struct srp_target_port {
 120        __be64                  id_ext;
 121        __be64                  ioc_guid;
 122        __be64                  service_id;
 123        __be64                  initiator_ext;
 124        u16                     io_class;
 125        struct srp_host        *srp_host;
 126        struct Scsi_Host       *scsi_host;
 127        char                    target_name[32];
 128        unsigned int            scsi_id;
 129
 130        struct ib_sa_path_rec   path;
 131        __be16                  orig_dgid[8];
 132        struct ib_sa_query     *path_query;
 133        int                     path_query_id;
 134
 135        struct ib_cm_id        *cm_id;
 136        struct ib_cq           *cq;
 137        struct ib_qp           *qp;
 138
 139        int                     max_ti_iu_len;
 140        s32                     req_lim;
 141
 142        int                     zero_req_lim;
 143
 144        unsigned                rx_head;
 145        struct srp_iu          *rx_ring[SRP_RQ_SIZE];
 146
 147        unsigned                tx_head;
 148        unsigned                tx_tail;
 149        struct srp_iu          *tx_ring[SRP_SQ_SIZE + 1];
 150
 151        struct list_head        free_reqs;
 152        struct list_head        req_queue;
 153        struct srp_request      req_ring[SRP_SQ_SIZE];
 154
 155        struct work_struct      work;
 156
 157        struct list_head        list;
 158        struct completion       done;
 159        int                     status;
 160        enum srp_target_state   state;
 161        int                     qp_in_error;
 162};
 163
 164struct srp_iu {
 165        u64                     dma;
 166        void                   *buf;
 167        size_t                  size;
 168        enum dma_data_direction direction;
 169};
 170
 171#endif /* IB_SRP_H */
 172