include/scsi/scsi_bsg_fc.h

   1 /*
   2  *  FC Transport BSG Interface
   3  *
   4  *  Copyright (C) 2008   James Smart, Emulex Corporation
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #ifndef SCSI_BSG_FC_H
  23 #define SCSI_BSG_FC_H
  24
  25 /*
  26  * This file intended to be included by both kernel and user space
  27  */
  28
  29 #include <scsi/scsi.h>
  30
  31 /*
  32  * FC Transport SGIO v4 BSG Message Support
  33  */
  34
  35 /* Default BSG request timeout (in seconds) */
  36 #define FC_DEFAULT_BSG_TIMEOUT          (10 * HZ)
  37
  38
  39 /*
  40  * Request Message Codes supported by the FC Transport
  41  */
  42
  43 /* define the class masks for the message codes */
  44 #define FC_BSG_CLS_MASK         0xF0000000      /* find object class */
  45 #define FC_BSG_HST_MASK         0x80000000      /* fc host class */
  46 #define FC_BSG_RPT_MASK         0x40000000      /* fc rport class */
  47
  48         /* fc_host Message Codes */
  49 #define FC_BSG_HST_ADD_RPORT            (FC_BSG_HST_MASK | 0x00000001)
  50 #define FC_BSG_HST_DEL_RPORT            (FC_BSG_HST_MASK | 0x00000002)
  51 #define FC_BSG_HST_ELS_NOLOGIN          (FC_BSG_HST_MASK | 0x00000003)
  52 #define FC_BSG_HST_CT                   (FC_BSG_HST_MASK | 0x00000004)
  53 #define FC_BSG_HST_VENDOR               (FC_BSG_HST_MASK | 0x000000FF)
  54
  55         /* fc_rport Message Codes */
  56 #define FC_BSG_RPT_ELS                  (FC_BSG_RPT_MASK | 0x00000001)
  57 #define FC_BSG_RPT_CT                   (FC_BSG_RPT_MASK | 0x00000002)
  58
  59
  60
  61 /*
  62  * FC Address Identifiers in Message Structures :
  63  *
  64  *   Whenever a command payload contains a FC Address Identifier
  65  *   (aka port_id), the value is effectively in big-endian
  66  *   order, thus the array elements are decoded as follows:
  67  *     element [0] is bits 23:16 of the FC Address Identifier
  68  *     element [1] is bits 15:8 of the FC Address Identifier
  69  *     element [2] is bits 7:0 of the FC Address Identifier
  70  */
  71
  72
  73 /*
  74  * FC Host Messages
  75  */
  76
  77 /* FC_BSG_HST_ADDR_PORT : */
  78
  79 /* Request:
  80  * This message requests the FC host to login to the remote port
  81  * at the specified N_Port_Id.  The remote port is to be enumerated
  82  * with the transport upon completion of the login.
  83  */
  84 struct fc_bsg_host_add_rport {
  85         uint8_t         reserved;
  86
  87         /* FC Address Identier of the remote port to login to */
  88         uint8_t         port_id[3];
  89 };
  90
  91 /* Response:
  92  * There is no additional response data - fc_bsg_reply->result is sufficient
  93  */
  94
  95
  96 /* FC_BSG_HST_DEL_RPORT : */
  97
  98 /* Request:
  99  * This message requests the FC host to remove an enumerated
 100  * remote port and to terminate the login to it.
 101  *
 102  * Note: The driver is free to reject this request if it desires to
 103  * remain logged in with the remote port.
 104  */
 105 struct fc_bsg_host_del_rport {
 106         uint8_t         reserved;
 107
 108         /* FC Address Identier of the remote port to logout of */
 109         uint8_t         port_id[3];
 110 };
 111
 112 /* Response:
 113  * There is no additional response data - fc_bsg_reply->result is sufficient
 114  */
 115
 116
 117 /* FC_BSG_HST_ELS_NOLOGIN : */
 118
 119 /* Request:
 120  * This message requests the FC_Host to send an ELS to a specific
 121  * N_Port_ID. The host does not need to log into the remote port,
 122  * nor does it need to enumerate the rport for further traffic
 123  * (although, the FC host is free to do so if it desires).
 124  */
 125 struct fc_bsg_host_els {
 126         /*
 127          * ELS Command Code being sent (must be the same as byte 0
 128          * of the payload)
 129          */
 130         uint8_t         command_code;
 131
 132         /* FC Address Identier of the remote port to send the ELS to */
 133         uint8_t         port_id[3];
 134 };
 135
 136 /* Response:
 137  */
 138 /* fc_bsg_ctels_reply->status values */
 139 #define FC_CTELS_STATUS_OK      0x00000000
 140 #define FC_CTELS_STATUS_REJECT  0x00000001
 141 #define FC_CTELS_STATUS_P_RJT   0x00000002
 142 #define FC_CTELS_STATUS_F_RJT   0x00000003
 143 #define FC_CTELS_STATUS_P_BSY   0x00000004
 144 #define FC_CTELS_STATUS_F_BSY   0x00000006
 145 struct fc_bsg_ctels_reply {
 146         /*
 147          * Note: An ELS LS_RJT may be reported in 2 ways:
 148          *  a) A status of FC_CTELS_STATUS_OK is returned. The caller
 149          *     is to look into the ELS receive payload to determine
 150          *     LS_ACC or LS_RJT (by contents of word 0). The reject
 151          *     data will be in word 1.
 152          *  b) A status of FC_CTELS_STATUS_REJECT is returned, The
 153          *     rjt_data field will contain valid data.
 154          *
 155          * Note: ELS LS_ACC is determined by an FC_CTELS_STATUS_OK, and
 156          *   the receive payload word 0 indicates LS_ACC
 157          *   (e.g. value is 0x02xxxxxx).
 158          *
 159          * Note: Similarly, a CT Reject may be reported in 2 ways:
 160          *  a) A status of FC_CTELS_STATUS_OK is returned. The caller
 161          *     is to look into the CT receive payload to determine
 162          *     Accept or Reject (by contents of word 2). The reject
 163          *     data will be in word 3.
 164          *  b) A status of FC_CTELS_STATUS_REJECT is returned, The
 165          *     rjt_data field will contain valid data.
 166          *
 167          * Note: x_RJT/BSY status will indicae that the rjt_data field
 168          *   is valid and contains the reason/explanation values.
 169          */
 170         uint32_t        status;         /* See FC_CTELS_STATUS_xxx */
 171
 172         /* valid if status is not FC_CTELS_STATUS_OK */
 173         struct  {
 174                 uint8_t action;         /* fragment_id for CT REJECT */
 175                 uint8_t reason_code;
 176                 uint8_t reason_explanation;
 177                 uint8_t vendor_unique;
 178         } rjt_data;
 179 };
 180
 181
 182 /* FC_BSG_HST_CT : */
 183
 184 /* Request:
 185  * This message requests that a CT Request be performed with the
 186  * indicated N_Port_ID. The driver is responsible for logging in with
 187  * the fabric and/or N_Port_ID, etc as per FC rules. This request does
 188  * not mandate that the driver must enumerate the destination in the
 189  * transport. The driver is allowed to decide whether to enumerate it,
 190  * and whether to tear it down after the request.
 191  */
 192 struct fc_bsg_host_ct {
 193         uint8_t         reserved;
 194
 195         /* FC Address Identier of the remote port to send the ELS to */
 196         uint8_t         port_id[3];
 197
 198         /*
 199          * We need words 0-2 of the generic preamble for the LLD's
 200          */
 201         uint32_t        preamble_word0; /* revision & IN_ID */
 202         uint32_t        preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
 203         uint32_t        preamble_word2; /* Cmd Code, Max Size */
 204
 205 };
 206 /* Response:
 207  *
 208  * The reply structure is an fc_bsg_ctels_reply structure
 209  */
 210
 211
 212 /* FC_BSG_HST_VENDOR : */
 213
 214 /* Request:
 215  * Note: When specifying vendor_id, be sure to read the Vendor Type and ID
 216  *   formatting requirements specified in scsi_netlink.h
 217  */
 218 struct fc_bsg_host_vendor {
 219         /*
 220          * Identifies the vendor that the message is formatted for. This
 221          * should be the recipient of the message.
 222          */
 223         uint64_t vendor_id;
 224
 225         /* start of vendor command area */
 226         uint32_t vendor_cmd[0];
 227 };
 228
 229 /* Response:
 230  */
 231 struct fc_bsg_host_vendor_reply {
 232         /* start of vendor response area */
 233         uint32_t vendor_rsp[0];
 234 };
 235
 236
 237
 238 /*
 239  * FC Remote Port Messages
 240  */
 241
 242 /* FC_BSG_RPT_ELS : */
 243
 244 /* Request:
 245  * This message requests that an ELS be performed with the rport.
 246  */
 247 struct fc_bsg_rport_els {
 248         /*
 249          * ELS Command Code being sent (must be the same as
 250          * byte 0 of the payload)
 251          */
 252         uint8_t els_code;
 253 };
 254
 255 /* Response:
 256  *
 257  * The reply structure is an fc_bsg_ctels_reply structure
 258  */
 259
 260
 261 /* FC_BSG_RPT_CT : */
 262
 263 /* Request:
 264  * This message requests that a CT Request be performed with the rport.
 265  */
 266 struct fc_bsg_rport_ct {
 267         /*
 268          * We need words 0-2 of the generic preamble for the LLD's
 269          */
 270         uint32_t        preamble_word0; /* revision & IN_ID */
 271         uint32_t        preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
 272         uint32_t        preamble_word2; /* Cmd Code, Max Size */
 273 };
 274 /* Response:
 275  *
 276  * The reply structure is an fc_bsg_ctels_reply structure
 277  */
 278
 279
 280
 281
 282 /* request (CDB) structure of the sg_io_v4 */
 283 struct fc_bsg_request {
 284         uint32_t msgcode;
 285         union {
 286                 struct fc_bsg_host_add_rport    h_addrport;
 287                 struct fc_bsg_host_del_rport    h_delrport;
 288                 struct fc_bsg_host_els          h_els;
 289                 struct fc_bsg_host_ct           h_ct;
 290                 struct fc_bsg_host_vendor       h_vendor;
 291
 292                 struct fc_bsg_rport_els         r_els;
 293                 struct fc_bsg_rport_ct          r_ct;
 294         } rqst_data;
 295 } __attribute__((packed));
 296
 297
 298 /* response (request sense data) structure of the sg_io_v4 */
 299 struct fc_bsg_reply {
 300         /*
 301          * The completion result. Result exists in two forms:
 302          *  if negative, it is an -Exxx system errno value. There will
 303          *    be no further reply information supplied.
 304          *  else, it's the 4-byte scsi error result, with driver, host,
 305          *    msg and status fields. The per-msgcode reply structure
 306          *    will contain valid data.
 307          */
 308         uint32_t result;
 309
 310         /* If there was reply_payload, how much was recevied ? */
 311         uint32_t reply_payload_rcv_len;
 312
 313         union {
 314                 struct fc_bsg_host_vendor_reply         vendor_reply;
 315
 316                 struct fc_bsg_ctels_reply               ctels_reply;
 317         } reply_data;
 318 };
 319
 320
 321 #endif /* SCSI_BSG_FC_H */
 322