drivers/infiniband/ulp/srp/ib_srp.h

   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
  49 enum {
  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
  63         SRP_SQ_SIZE             = SRP_RQ_SIZE,
  64         SRP_RSP_SQ_SIZE         = 1,
  65         SRP_REQ_SQ_SIZE         = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
  66         SRP_TSK_MGMT_SQ_SIZE    = 1,
  67         SRP_CMD_SQ_SIZE         = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
  68
  69         SRP_TAG_NO_REQ          = ~0U,
  70         SRP_TAG_TSK_MGMT        = 1U << 31,
  71
  72         SRP_FMR_SIZE            = 256,
  73         SRP_FMR_POOL_SIZE       = 1024,
  74         SRP_FMR_DIRTY_SIZE      = SRP_FMR_POOL_SIZE / 4,
  75
  76         SRP_MAP_ALLOW_FMR       = 0,
  77         SRP_MAP_NO_FMR          = 1,
  78 };
  79
  80 enum srp_target_state {
  81         SRP_TARGET_LIVE,
  82         SRP_TARGET_CONNECTING,
  83         SRP_TARGET_DEAD,
  84         SRP_TARGET_REMOVED
  85 };
  86
  87 enum srp_iu_type {
  88         SRP_IU_CMD,
  89         SRP_IU_TSK_MGMT,
  90         SRP_IU_RSP,
  91 };
  92
  93 struct srp_device {
  94         struct list_head        dev_list;
  95         struct ib_device       *dev;
  96         struct ib_pd           *pd;
  97         struct ib_mr           *mr;
  98         struct ib_fmr_pool     *fmr_pool;
  99         u64                     fmr_page_mask;
 100         int                     fmr_page_size;
 101         int                     fmr_max_size;
 102 };
 103
 104 struct srp_host {
 105         struct srp_device      *srp_dev;
 106         u8                      port;
 107         struct device           dev;
 108         struct list_head        target_list;
 109         spinlock_t              target_lock;
 110         struct completion       released;
 111         struct list_head        list;
 112 };
 113
 114 struct srp_request {
 115         struct list_head        list;
 116         struct scsi_cmnd       *scmnd;
 117         struct srp_iu          *cmd;
 118         struct ib_pool_fmr    **fmr_list;
 119         u64                    *map_page;
 120         short                   nfmr;
 121         short                   index;
 122 };
 123
 124 struct srp_target_port {
 125         /* These are RW in the hot path, and commonly used together */
 126         struct list_head        free_tx;
 127         struct list_head        free_reqs;
 128         spinlock_t              lock;
 129         s32                     req_lim;
 130
 131         /* These are read-only in the hot path */
 132         struct ib_cq           *send_cq ____cacheline_aligned_in_smp;
 133         struct ib_cq           *recv_cq;
 134         struct ib_qp           *qp;
 135         u32                     lkey;
 136         u32                     rkey;
 137         enum srp_target_state   state;
 138         unsigned int            max_iu_len;
 139         unsigned int            cmd_sg_cnt;
 140
 141         /* Everything above this point is used in the hot path of
 142          * command processing. Try to keep them packed into cachelines.
 143          */
 144
 145         __be64                  id_ext;
 146         __be64                  ioc_guid;
 147         __be64                  service_id;
 148         __be64                  initiator_ext;
 149         u16                     io_class;
 150         struct srp_host        *srp_host;
 151         struct Scsi_Host       *scsi_host;
 152         char                    target_name[32];
 153         unsigned int            scsi_id;
 154
 155         struct ib_sa_path_rec   path;
 156         __be16                  orig_dgid[8];
 157         struct ib_sa_query     *path_query;
 158         int                     path_query_id;
 159
 160         struct ib_cm_id        *cm_id;
 161
 162         int                     max_ti_iu_len;
 163
 164         int                     zero_req_lim;
 165
 166         struct srp_iu          *tx_ring[SRP_SQ_SIZE];
 167         struct srp_iu          *rx_ring[SRP_RQ_SIZE];
 168         struct srp_request      req_ring[SRP_CMD_SQ_SIZE];
 169
 170         struct work_struct      work;
 171
 172         struct list_head        list;
 173         struct completion       done;
 174         int                     status;
 175         int                     qp_in_error;
 176
 177         struct completion       tsk_mgmt_done;
 178         u8                      tsk_mgmt_status;
 179 };
 180
 181 struct srp_iu {
 182         struct list_head        list;
 183         u64                     dma;
 184         void                   *buf;
 185         size_t                  size;
 186         enum dma_data_direction direction;
 187 };
 188
 189 struct srp_map_state {
 190         struct ib_pool_fmr    **next_fmr;
 191         struct srp_direct_buf  *desc;
 192         u64                    *pages;
 193         dma_addr_t              base_dma_addr;
 194         u32                     fmr_len;
 195         u32                     total_len;
 196         unsigned int            npages;
 197         unsigned int            nfmr;
 198         unsigned int            ndesc;
 199         struct scatterlist     *unmapped_sg;
 200         int                     unmapped_index;
 201         dma_addr_t              unmapped_addr;
 202 };
 203
 204 #endif /* IB_SRP_H */