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            = 512,
  73         SRP_FMR_MIN_SIZE        = 128,
  74         SRP_FMR_POOL_SIZE       = 1024,
  75         SRP_FMR_DIRTY_SIZE      = SRP_FMR_POOL_SIZE / 4,
  76
  77         SRP_MAP_ALLOW_FMR       = 0,
  78         SRP_MAP_NO_FMR          = 1,
  79 };
  80
  81 enum srp_target_state {
  82         SRP_TARGET_LIVE,
  83         SRP_TARGET_REMOVED,
  84 };
  85
  86 enum srp_iu_type {
  87         SRP_IU_CMD,
  88         SRP_IU_TSK_MGMT,
  89         SRP_IU_RSP,
  90 };
  91
  92 struct srp_device {
  93         struct list_head        dev_list;
  94         struct ib_device       *dev;
  95         struct ib_pd           *pd;
  96         struct ib_mr           *mr;
  97         struct ib_fmr_pool     *fmr_pool;
  98         u64                     fmr_page_mask;
  99         int                     fmr_page_size;
 100         int                     fmr_max_size;
 101 };
 102
 103 struct srp_host {
 104         struct srp_device      *srp_dev;
 105         u8                      port;
 106         struct device           dev;
 107         struct list_head        target_list;
 108         spinlock_t              target_lock;
 109         struct completion       released;
 110         struct list_head        list;
 111 };
 112
 113 struct srp_request {
 114         struct list_head        list;
 115         struct scsi_cmnd       *scmnd;
 116         struct srp_iu          *cmd;
 117         struct ib_pool_fmr    **fmr_list;
 118         u64                    *map_page;
 119         struct srp_direct_buf  *indirect_desc;
 120         dma_addr_t              indirect_dma_addr;
 121         short                   nfmr;
 122         short                   index;
 123 };
 124
 125 struct srp_target_port {
 126         /* These are RW in the hot path, and commonly used together */
 127         struct list_head        free_tx;
 128         struct list_head        free_reqs;
 129         spinlock_t              lock;
 130         s32                     req_lim;
 131
 132         /* These are read-only in the hot path */
 133         struct ib_cq           *send_cq ____cacheline_aligned_in_smp;
 134         struct ib_cq           *recv_cq;
 135         struct ib_qp           *qp;
 136         u32                     lkey;
 137         u32                     rkey;
 138         enum srp_target_state   state;
 139         unsigned int            max_iu_len;
 140         unsigned int            cmd_sg_cnt;
 141         unsigned int            indirect_size;
 142         bool                    allow_ext_sg;
 143
 144         /* Everything above this point is used in the hot path of
 145          * command processing. Try to keep them packed into cachelines.
 146          */
 147
 148         __be64                  id_ext;
 149         __be64                  ioc_guid;
 150         __be64                  service_id;
 151         __be64                  initiator_ext;
 152         u16                     io_class;
 153         struct srp_host        *srp_host;
 154         struct Scsi_Host       *scsi_host;
 155         struct srp_rport       *rport;
 156         char                    target_name[32];
 157         unsigned int            scsi_id;
 158         unsigned int            sg_tablesize;
 159         int                     comp_vector;
 160         int                     tl_retry_count;
 161
 162         struct ib_sa_path_rec   path;
 163         __be16                  orig_dgid[8];
 164         struct ib_sa_query     *path_query;
 165         int                     path_query_id;
 166
 167         u32                     rq_tmo_jiffies;
 168         bool                    connected;
 169
 170         struct ib_cm_id        *cm_id;
 171
 172         int                     max_ti_iu_len;
 173
 174         int                     zero_req_lim;
 175
 176         struct srp_iu          *tx_ring[SRP_SQ_SIZE];
 177         struct srp_iu          *rx_ring[SRP_RQ_SIZE];
 178         struct srp_request      req_ring[SRP_CMD_SQ_SIZE];
 179
 180         struct work_struct      remove_work;
 181
 182         struct list_head        list;
 183         struct completion       done;
 184         int                     status;
 185         bool                    qp_in_error;
 186
 187         struct completion       tsk_mgmt_done;
 188         u8                      tsk_mgmt_status;
 189 };
 190
 191 struct srp_iu {
 192         struct list_head        list;
 193         u64                     dma;
 194         void                   *buf;
 195         size_t                  size;
 196         enum dma_data_direction direction;
 197 };
 198
 199 struct srp_map_state {
 200         struct ib_pool_fmr    **next_fmr;
 201         struct srp_direct_buf  *desc;
 202         u64                    *pages;
 203         dma_addr_t              base_dma_addr;
 204         u32                     fmr_len;
 205         u32                     total_len;
 206         unsigned int            npages;
 207         unsigned int            nfmr;
 208         unsigned int            ndesc;
 209         struct scatterlist     *unmapped_sg;
 210         int                     unmapped_index;
 211         dma_addr_t              unmapped_addr;
 212 };
 213
 214 #endif /* IB_SRP_H */