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  * $Id: ib_srp.h 3932 2005-11-01 17:19:29Z roland $
  33  */
  34
  35 #ifndef IB_SRP_H
  36 #define IB_SRP_H
  37
  38 #include <linux/types.h>
  39 #include <linux/list.h>
  40 #include <linux/mutex.h>
  41 #include <linux/scatterlist.h>
  42
  43 #include <scsi/scsi_host.h>
  44 #include <scsi/scsi_cmnd.h>
  45
  46 #include <rdma/ib_verbs.h>
  47 #include <rdma/ib_sa.h>
  48 #include <rdma/ib_cm.h>
  49
  50 enum {
  51         SRP_PATH_REC_TIMEOUT_MS = 1000,
  52         SRP_ABORT_TIMEOUT_MS    = 5000,
  53
  54         SRP_PORT_REDIRECT       = 1,
  55         SRP_DLID_REDIRECT       = 2,
  56
  57         SRP_MAX_LUN             = 512,
  58         SRP_MAX_IU_LEN          = 256,
  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
  68 #define SRP_OP_RECV             (1 << 31)
  69 #define SRP_MAX_INDIRECT        ((SRP_MAX_IU_LEN -                      \
  70                                   sizeof (struct srp_cmd) -             \
  71                                   sizeof (struct srp_indirect_buf)) / 16)
  72
  73 enum srp_target_state {
  74         SRP_TARGET_LIVE,
  75         SRP_TARGET_CONNECTING,
  76         SRP_TARGET_DEAD,
  77         SRP_TARGET_REMOVED
  78 };
  79
  80 struct srp_host {
  81         u8                      initiator_port_id[16];
  82         struct ib_device       *dev;
  83         u8                      port;
  84         struct ib_pd           *pd;
  85         struct ib_mr           *mr;
  86         struct class_device     class_dev;
  87         struct list_head        target_list;
  88         struct mutex            target_mutex;
  89         struct completion       released;
  90         struct list_head        list;
  91 };
  92
  93 struct srp_request {
  94         struct list_head        list;
  95         struct scsi_cmnd       *scmnd;
  96         struct srp_iu          *cmd;
  97         struct srp_iu          *tsk_mgmt;
  98         /*
  99          * Fake scatterlist used when scmnd->use_sg==0.  Can be killed
 100          * when the SCSI midlayer no longer generates non-SG commands.
 101          */
 102         struct scatterlist      fake_sg;
 103         struct completion       done;
 104         short                   next;
 105         u8                      cmd_done;
 106         u8                      tsk_status;
 107 };
 108
 109 struct srp_target_port {
 110         __be64                  id_ext;
 111         __be64                  ioc_guid;
 112         __be64                  service_id;
 113         struct srp_host        *srp_host;
 114         struct Scsi_Host       *scsi_host;
 115         char                    target_name[32];
 116         unsigned int            scsi_id;
 117
 118         struct ib_sa_path_rec   path;
 119         struct ib_sa_query     *path_query;
 120         int                     path_query_id;
 121
 122         struct ib_cm_id        *cm_id;
 123         struct ib_cq           *cq;
 124         struct ib_qp           *qp;
 125
 126         int                     max_ti_iu_len;
 127         s32                     req_lim;
 128
 129         unsigned                rx_head;
 130         struct srp_iu          *rx_ring[SRP_RQ_SIZE];
 131
 132         unsigned                tx_head;
 133         unsigned                tx_tail;
 134         struct srp_iu          *tx_ring[SRP_SQ_SIZE + 1];
 135
 136         int                     req_head;
 137         struct list_head        req_queue;
 138         struct srp_request      req_ring[SRP_SQ_SIZE];
 139
 140         struct work_struct      work;
 141
 142         struct list_head        list;
 143         struct completion       done;
 144         int                     status;
 145         enum srp_target_state   state;
 146 };
 147
 148 struct srp_iu {
 149         dma_addr_t              dma;
 150         void                   *buf;
 151         size_t                  size;
 152         enum dma_data_direction direction;
 153 };
 154
 155 #endif /* IB_SRP_H */