drivers/target/sbp/sbp_target.c

   1 /*
   2  * SBP2 target driver (SCSI over IEEE1394 in target mode)
   3  *
   4  * Copyright (C) 2011  Chris Boot <bootc@bootc.net>
   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 Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #define KMSG_COMPONENT "sbp_target"
  22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/types.h>
  28 #include <linux/string.h>
  29 #include <linux/configfs.h>
  30 #include <linux/ctype.h>
  31 #include <linux/firewire.h>
  32 #include <linux/firewire-constants.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_tcq.h>
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_backend.h>
  37 #include <target/target_core_fabric.h>
  38 #include <target/target_core_fabric_configfs.h>
  39 #include <target/target_core_configfs.h>
  40 #include <target/configfs_macros.h>
  41 #include <asm/unaligned.h>
  42
  43 #include "sbp_target.h"
  44
  45 /* Local pointer to allocated TCM configfs fabric module */
  46 static struct target_fabric_configfs *sbp_fabric_configfs;
  47
  48 /* FireWire address region for management and command block address handlers */
  49 static const struct fw_address_region sbp_register_region = {
  50         .start  = CSR_REGISTER_BASE + 0x10000,
  51         .end    = 0x1000000000000ULL,
  52 };
  53
  54 static const u32 sbp_unit_directory_template[] = {
  55         0x1200609e, /* unit_specifier_id: NCITS/T10 */
  56         0x13010483, /* unit_sw_version: 1155D Rev 4 */
  57         0x3800609e, /* command_set_specifier_id: NCITS/T10 */
  58         0x390104d8, /* command_set: SPC-2 */
  59         0x3b000000, /* command_set_revision: 0 */
  60         0x3c000001, /* firmware_revision: 1 */
  61 };
  62
  63 #define SESSION_MAINTENANCE_INTERVAL HZ
  64
  65 static atomic_t login_id = ATOMIC_INIT(0);
  66
  67 static void session_maintenance_work(struct work_struct *);
  68 static int sbp_run_transaction(struct fw_card *, int, int, int, int,
  69                 unsigned long long, void *, size_t);
  70
  71 static int read_peer_guid(u64 *guid, const struct sbp_management_request *req)
  72 {
  73         int ret;
  74         __be32 high, low;
  75
  76         ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
  77                         req->node_addr, req->generation, req->speed,
  78                         (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 3 * 4,
  79                         &high, sizeof(high));
  80         if (ret != RCODE_COMPLETE)
  81                 return ret;
  82
  83         ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
  84                         req->node_addr, req->generation, req->speed,
  85                         (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 4 * 4,
  86                         &low, sizeof(low));
  87         if (ret != RCODE_COMPLETE)
  88                 return ret;
  89
  90         *guid = (u64)be32_to_cpu(high) << 32 | be32_to_cpu(low);
  91
  92         return RCODE_COMPLETE;
  93 }
  94
  95 static struct sbp_session *sbp_session_find_by_guid(
  96         struct sbp_tpg *tpg, u64 guid)
  97 {
  98         struct se_session *se_sess;
  99         struct sbp_session *sess, *found = NULL;
 100
 101         spin_lock_bh(&tpg->se_tpg.session_lock);
 102         list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
 103                 sess = se_sess->fabric_sess_ptr;
 104                 if (sess->guid == guid)
 105                         found = sess;
 106         }
 107         spin_unlock_bh(&tpg->se_tpg.session_lock);
 108
 109         return found;
 110 }
 111
 112 static struct sbp_login_descriptor *sbp_login_find_by_lun(
 113                 struct sbp_session *session, struct se_lun *lun)
 114 {
 115         struct sbp_login_descriptor *login, *found = NULL;
 116
 117         spin_lock_bh(&session->lock);
 118         list_for_each_entry(login, &session->login_list, link) {
 119                 if (login->lun == lun)
 120                         found = login;
 121         }
 122         spin_unlock_bh(&session->lock);
 123
 124         return found;
 125 }
 126
 127 static int sbp_login_count_all_by_lun(
 128                 struct sbp_tpg *tpg,
 129                 struct se_lun *lun,
 130                 int exclusive)
 131 {
 132         struct se_session *se_sess;
 133         struct sbp_session *sess;
 134         struct sbp_login_descriptor *login;
 135         int count = 0;
 136
 137         spin_lock_bh(&tpg->se_tpg.session_lock);
 138         list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
 139                 sess = se_sess->fabric_sess_ptr;
 140
 141                 spin_lock_bh(&sess->lock);
 142                 list_for_each_entry(login, &sess->login_list, link) {
 143                         if (login->lun != lun)
 144                                 continue;
 145
 146                         if (!exclusive || login->exclusive)
 147                                 count++;
 148                 }
 149                 spin_unlock_bh(&sess->lock);
 150         }
 151         spin_unlock_bh(&tpg->se_tpg.session_lock);
 152
 153         return count;
 154 }
 155
 156 static struct sbp_login_descriptor *sbp_login_find_by_id(
 157         struct sbp_tpg *tpg, int login_id)
 158 {
 159         struct se_session *se_sess;
 160         struct sbp_session *sess;
 161         struct sbp_login_descriptor *login, *found = NULL;
 162
 163         spin_lock_bh(&tpg->se_tpg.session_lock);
 164         list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
 165                 sess = se_sess->fabric_sess_ptr;
 166
 167                 spin_lock_bh(&sess->lock);
 168                 list_for_each_entry(login, &sess->login_list, link) {
 169                         if (login->login_id == login_id)
 170                                 found = login;
 171                 }
 172                 spin_unlock_bh(&sess->lock);
 173         }
 174         spin_unlock_bh(&tpg->se_tpg.session_lock);
 175
 176         return found;
 177 }
 178
 179 static struct se_lun *sbp_get_lun_from_tpg(struct sbp_tpg *tpg, int lun)
 180 {
 181         struct se_portal_group *se_tpg = &tpg->se_tpg;
 182         struct se_lun *se_lun;
 183
 184         if (lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 185                 return ERR_PTR(-EINVAL);
 186
 187         spin_lock(&se_tpg->tpg_lun_lock);
 188         se_lun = se_tpg->tpg_lun_list[lun];
 189
 190         if (se_lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 191                 se_lun = ERR_PTR(-ENODEV);
 192
 193         spin_unlock(&se_tpg->tpg_lun_lock);
 194
 195         return se_lun;
 196 }
 197
 198 static struct sbp_session *sbp_session_create(
 199                 struct sbp_tpg *tpg,
 200                 u64 guid)
 201 {
 202         struct sbp_session *sess;
 203         int ret;
 204         char guid_str[17];
 205         struct se_node_acl *se_nacl;
 206
 207         sess = kmalloc(sizeof(*sess), GFP_KERNEL);
 208         if (!sess) {
 209                 pr_err("failed to allocate session descriptor\n");
 210                 return ERR_PTR(-ENOMEM);
 211         }
 212
 213         sess->se_sess = transport_init_session();
 214         if (IS_ERR(sess->se_sess)) {
 215                 pr_err("failed to init se_session\n");
 216
 217                 ret = PTR_ERR(sess->se_sess);
 218                 kfree(sess);
 219                 return ERR_PTR(ret);
 220         }
 221
 222         snprintf(guid_str, sizeof(guid_str), "%016llx", guid);
 223
 224         se_nacl = core_tpg_check_initiator_node_acl(&tpg->se_tpg, guid_str);
 225         if (!se_nacl) {
 226                 pr_warn("Node ACL not found for %s\n", guid_str);
 227
 228                 transport_free_session(sess->se_sess);
 229                 kfree(sess);
 230
 231                 return ERR_PTR(-EPERM);
 232         }
 233
 234         sess->se_sess->se_node_acl = se_nacl;
 235
 236         spin_lock_init(&sess->lock);
 237         INIT_LIST_HEAD(&sess->login_list);
 238         INIT_DELAYED_WORK(&sess->maint_work, session_maintenance_work);
 239
 240         sess->guid = guid;
 241
 242         transport_register_session(&tpg->se_tpg, se_nacl, sess->se_sess, sess);
 243
 244         return sess;
 245 }
 246
 247 static void sbp_session_release(struct sbp_session *sess, bool cancel_work)
 248 {
 249         spin_lock_bh(&sess->lock);
 250         if (!list_empty(&sess->login_list)) {
 251                 spin_unlock_bh(&sess->lock);
 252                 return;
 253         }
 254         spin_unlock_bh(&sess->lock);
 255
 256         if (cancel_work)
 257                 cancel_delayed_work_sync(&sess->maint_work);
 258
 259         transport_deregister_session_configfs(sess->se_sess);
 260         transport_deregister_session(sess->se_sess);
 261
 262         if (sess->card)
 263                 fw_card_put(sess->card);
 264
 265         kfree(sess);
 266 }
 267
 268 static void sbp_target_agent_unregister(struct sbp_target_agent *);
 269
 270 static void sbp_login_release(struct sbp_login_descriptor *login,
 271         bool cancel_work)
 272 {
 273         struct sbp_session *sess = login->sess;
 274
 275         /* FIXME: abort/wait on tasks */
 276
 277         sbp_target_agent_unregister(login->tgt_agt);
 278
 279         if (sess) {
 280                 spin_lock_bh(&sess->lock);
 281                 list_del(&login->link);
 282                 spin_unlock_bh(&sess->lock);
 283
 284                 sbp_session_release(sess, cancel_work);
 285         }
 286
 287         kfree(login);
 288 }
 289
 290 static struct sbp_target_agent *sbp_target_agent_register(
 291         struct sbp_login_descriptor *);
 292
 293 static void sbp_management_request_login(
 294         struct sbp_management_agent *agent, struct sbp_management_request *req,
 295         int *status_data_size)
 296 {
 297         struct sbp_tport *tport = agent->tport;
 298         struct sbp_tpg *tpg = tport->tpg;
 299         struct se_lun *se_lun;
 300         int ret;
 301         u64 guid;
 302         struct sbp_session *sess;
 303         struct sbp_login_descriptor *login;
 304         struct sbp_login_response_block *response;
 305         int login_response_len;
 306
 307         se_lun = sbp_get_lun_from_tpg(tpg,
 308                         LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
 309         if (IS_ERR(se_lun)) {
 310                 pr_notice("login to unknown LUN: %d\n",
 311                         LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
 312
 313                 req->status.status = cpu_to_be32(
 314                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 315                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LUN_NOTSUPP));
 316                 return;
 317         }
 318
 319         ret = read_peer_guid(&guid, req);
 320         if (ret != RCODE_COMPLETE) {
 321                 pr_warn("failed to read peer GUID: %d\n", ret);
 322
 323                 req->status.status = cpu_to_be32(
 324                         STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
 325                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
 326                 return;
 327         }
 328
 329         pr_notice("mgt_agent LOGIN to LUN %d from %016llx\n",
 330                 se_lun->unpacked_lun, guid);
 331
 332         sess = sbp_session_find_by_guid(tpg, guid);
 333         if (sess) {
 334                 login = sbp_login_find_by_lun(sess, se_lun);
 335                 if (login) {
 336                         pr_notice("initiator already logged-in\n");
 337
 338                         /*
 339                          * SBP-2 R4 says we should return access denied, but
 340                          * that can confuse initiators. Instead we need to
 341                          * treat this like a reconnect, but send the login
 342                          * response block like a fresh login.
 343                          *
 344                          * This is required particularly in the case of Apple
 345                          * devices booting off the FireWire target, where
 346                          * the firmware has an active login to the target. When
 347                          * the OS takes control of the session it issues its own
 348                          * LOGIN rather than a RECONNECT. To avoid the machine
 349                          * waiting until the reconnect_hold expires, we can skip
 350                          * the ACCESS_DENIED errors to speed things up.
 351                          */
 352
 353                         goto already_logged_in;
 354                 }
 355         }
 356
 357         /*
 358          * check exclusive bit in login request
 359          * reject with access_denied if any logins present
 360          */
 361         if (LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc)) &&
 362                         sbp_login_count_all_by_lun(tpg, se_lun, 0)) {
 363                 pr_warn("refusing exclusive login with other active logins\n");
 364
 365                 req->status.status = cpu_to_be32(
 366                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 367                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
 368                 return;
 369         }
 370
 371         /*
 372          * check exclusive bit in any existing login descriptor
 373          * reject with access_denied if any exclusive logins present
 374          */
 375         if (sbp_login_count_all_by_lun(tpg, se_lun, 1)) {
 376                 pr_warn("refusing login while another exclusive login present\n");
 377
 378                 req->status.status = cpu_to_be32(
 379                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 380                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
 381                 return;
 382         }
 383
 384         /*
 385          * check we haven't exceeded the number of allowed logins
 386          * reject with resources_unavailable if we have
 387          */
 388         if (sbp_login_count_all_by_lun(tpg, se_lun, 0) >=
 389                         tport->max_logins_per_lun) {
 390                 pr_warn("max number of logins reached\n");
 391
 392                 req->status.status = cpu_to_be32(
 393                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 394                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
 395                 return;
 396         }
 397
 398         if (!sess) {
 399                 sess = sbp_session_create(tpg, guid);
 400                 if (IS_ERR(sess)) {
 401                         switch (PTR_ERR(sess)) {
 402                         case -EPERM:
 403                                 ret = SBP_STATUS_ACCESS_DENIED;
 404                                 break;
 405                         default:
 406                                 ret = SBP_STATUS_RESOURCES_UNAVAIL;
 407                                 break;
 408                         }
 409
 410                         req->status.status = cpu_to_be32(
 411                                 STATUS_BLOCK_RESP(
 412                                         STATUS_RESP_REQUEST_COMPLETE) |
 413                                 STATUS_BLOCK_SBP_STATUS(ret));
 414                         return;
 415                 }
 416
 417                 sess->node_id = req->node_addr;
 418                 sess->card = fw_card_get(req->card);
 419                 sess->generation = req->generation;
 420                 sess->speed = req->speed;
 421
 422                 schedule_delayed_work(&sess->maint_work,
 423                                 SESSION_MAINTENANCE_INTERVAL);
 424         }
 425
 426         /* only take the latest reconnect_hold into account */
 427         sess->reconnect_hold = min(
 428                 1 << LOGIN_ORB_RECONNECT(be32_to_cpu(req->orb.misc)),
 429                 tport->max_reconnect_timeout) - 1;
 430
 431         login = kmalloc(sizeof(*login), GFP_KERNEL);
 432         if (!login) {
 433                 pr_err("failed to allocate login descriptor\n");
 434
 435                 sbp_session_release(sess, true);
 436
 437                 req->status.status = cpu_to_be32(
 438                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 439                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
 440                 return;
 441         }
 442
 443         login->sess = sess;
 444         login->lun = se_lun;
 445         login->status_fifo_addr = sbp2_pointer_to_addr(&req->orb.status_fifo);
 446         login->exclusive = LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc));
 447         login->login_id = atomic_inc_return(&login_id);
 448
 449         login->tgt_agt = sbp_target_agent_register(login);
 450         if (IS_ERR(login->tgt_agt)) {
 451                 ret = PTR_ERR(login->tgt_agt);
 452                 pr_err("failed to map command block handler: %d\n", ret);
 453
 454                 sbp_session_release(sess, true);
 455                 kfree(login);
 456
 457                 req->status.status = cpu_to_be32(
 458                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 459                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
 460                 return;
 461         }
 462
 463         spin_lock_bh(&sess->lock);
 464         list_add_tail(&login->link, &sess->login_list);
 465         spin_unlock_bh(&sess->lock);
 466
 467 already_logged_in:
 468         response = kzalloc(sizeof(*response), GFP_KERNEL);
 469         if (!response) {
 470                 pr_err("failed to allocate login response block\n");
 471
 472                 sbp_login_release(login, true);
 473
 474                 req->status.status = cpu_to_be32(
 475                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 476                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
 477                 return;
 478         }
 479
 480         login_response_len = clamp_val(
 481                         LOGIN_ORB_RESPONSE_LENGTH(be32_to_cpu(req->orb.length)),
 482                         12, sizeof(*response));
 483         response->misc = cpu_to_be32(
 484                 ((login_response_len & 0xffff) << 16) |
 485                 (login->login_id & 0xffff));
 486         response->reconnect_hold = cpu_to_be32(sess->reconnect_hold & 0xffff);
 487         addr_to_sbp2_pointer(login->tgt_agt->handler.offset,
 488                 &response->command_block_agent);
 489
 490         ret = sbp_run_transaction(sess->card, TCODE_WRITE_BLOCK_REQUEST,
 491                 sess->node_id, sess->generation, sess->speed,
 492                 sbp2_pointer_to_addr(&req->orb.ptr2), response,
 493                 login_response_len);
 494         if (ret != RCODE_COMPLETE) {
 495                 pr_debug("failed to write login response block: %x\n", ret);
 496
 497                 kfree(response);
 498                 sbp_login_release(login, true);
 499
 500                 req->status.status = cpu_to_be32(
 501                         STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
 502                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
 503                 return;
 504         }
 505
 506         kfree(response);
 507
 508         req->status.status = cpu_to_be32(
 509                 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 510                 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
 511 }
 512
 513 static void sbp_management_request_query_logins(
 514         struct sbp_management_agent *agent, struct sbp_management_request *req,
 515         int *status_data_size)
 516 {
 517         pr_notice("QUERY LOGINS not implemented\n");
 518         /* FIXME: implement */
 519
 520         req->status.status = cpu_to_be32(
 521                 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 522                 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
 523 }
 524
 525 static void sbp_management_request_reconnect(
 526         struct sbp_management_agent *agent, struct sbp_management_request *req,
 527         int *status_data_size)
 528 {
 529         struct sbp_tport *tport = agent->tport;
 530         struct sbp_tpg *tpg = tport->tpg;
 531         int ret;
 532         u64 guid;
 533         struct sbp_login_descriptor *login;
 534
 535         ret = read_peer_guid(&guid, req);
 536         if (ret != RCODE_COMPLETE) {
 537                 pr_warn("failed to read peer GUID: %d\n", ret);
 538
 539                 req->status.status = cpu_to_be32(
 540                         STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
 541                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
 542                 return;
 543         }
 544
 545         pr_notice("mgt_agent RECONNECT from %016llx\n", guid);
 546
 547         login = sbp_login_find_by_id(tpg,
 548                 RECONNECT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc)));
 549
 550         if (!login) {
 551                 pr_err("mgt_agent RECONNECT unknown login ID\n");
 552
 553                 req->status.status = cpu_to_be32(
 554                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 555                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
 556                 return;
 557         }
 558
 559         if (login->sess->guid != guid) {
 560                 pr_err("mgt_agent RECONNECT login GUID doesn't match\n");
 561
 562                 req->status.status = cpu_to_be32(
 563                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 564                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
 565                 return;
 566         }
 567
 568         spin_lock_bh(&login->sess->lock);
 569         if (login->sess->card)
 570                 fw_card_put(login->sess->card);
 571
 572         /* update the node details */
 573         login->sess->generation = req->generation;
 574         login->sess->node_id = req->node_addr;
 575         login->sess->card = fw_card_get(req->card);
 576         login->sess->speed = req->speed;
 577         spin_unlock_bh(&login->sess->lock);
 578
 579         req->status.status = cpu_to_be32(
 580                 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 581                 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
 582 }
 583
 584 static void sbp_management_request_logout(
 585         struct sbp_management_agent *agent, struct sbp_management_request *req,
 586         int *status_data_size)
 587 {
 588         struct sbp_tport *tport = agent->tport;
 589         struct sbp_tpg *tpg = tport->tpg;
 590         int id;
 591         struct sbp_login_descriptor *login;
 592
 593         id = LOGOUT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc));
 594
 595         login = sbp_login_find_by_id(tpg, id);
 596         if (!login) {
 597                 pr_warn("cannot find login: %d\n", id);
 598
 599                 req->status.status = cpu_to_be32(
 600                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 601                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LOGIN_ID_UNKNOWN));
 602                 return;
 603         }
 604
 605         pr_info("mgt_agent LOGOUT from LUN %d session %d\n",
 606                 login->lun->unpacked_lun, login->login_id);
 607
 608         if (req->node_addr != login->sess->node_id) {
 609                 pr_warn("logout from different node ID\n");
 610
 611                 req->status.status = cpu_to_be32(
 612                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 613                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
 614                 return;
 615         }
 616
 617         sbp_login_release(login, true);
 618
 619         req->status.status = cpu_to_be32(
 620                 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
 621                 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
 622 }
 623
 624 static void session_check_for_reset(struct sbp_session *sess)
 625 {
 626         bool card_valid = false;
 627
 628         spin_lock_bh(&sess->lock);
 629
 630         if (sess->card) {
 631                 spin_lock_irq(&sess->card->lock);
 632                 card_valid = (sess->card->local_node != NULL);
 633                 spin_unlock_irq(&sess->card->lock);
 634
 635                 if (!card_valid) {
 636                         fw_card_put(sess->card);
 637                         sess->card = NULL;
 638                 }
 639         }
 640
 641         if (!card_valid || (sess->generation != sess->card->generation)) {
 642                 pr_info("Waiting for reconnect from node: %016llx\n",
 643                                 sess->guid);
 644
 645                 sess->node_id = -1;
 646                 sess->reconnect_expires = get_jiffies_64() +
 647                         ((sess->reconnect_hold + 1) * HZ);
 648         }
 649
 650         spin_unlock_bh(&sess->lock);
 651 }
 652
 653 static void session_reconnect_expired(struct sbp_session *sess)
 654 {
 655         struct sbp_login_descriptor *login, *temp;
 656         LIST_HEAD(login_list);
 657
 658         pr_info("Reconnect timer expired for node: %016llx\n", sess->guid);
 659
 660         spin_lock_bh(&sess->lock);
 661         list_for_each_entry_safe(login, temp, &sess->login_list, link) {
 662                 login->sess = NULL;
 663                 list_move_tail(&login->link, &login_list);
 664         }
 665         spin_unlock_bh(&sess->lock);
 666
 667         list_for_each_entry_safe(login, temp, &login_list, link) {
 668                 list_del(&login->link);
 669                 sbp_login_release(login, false);
 670         }
 671
 672         sbp_session_release(sess, false);
 673 }
 674
 675 static void session_maintenance_work(struct work_struct *work)
 676 {
 677         struct sbp_session *sess = container_of(work, struct sbp_session,
 678                         maint_work.work);
 679
 680         /* could be called while tearing down the session */
 681         spin_lock_bh(&sess->lock);
 682         if (list_empty(&sess->login_list)) {
 683                 spin_unlock_bh(&sess->lock);
 684                 return;
 685         }
 686         spin_unlock_bh(&sess->lock);
 687
 688         if (sess->node_id != -1) {
 689                 /* check for bus reset and make node_id invalid */
 690                 session_check_for_reset(sess);
 691
 692                 schedule_delayed_work(&sess->maint_work,
 693                                 SESSION_MAINTENANCE_INTERVAL);
 694         } else if (!time_after64(get_jiffies_64(), sess->reconnect_expires)) {
 695                 /* still waiting for reconnect */
 696                 schedule_delayed_work(&sess->maint_work,
 697                                 SESSION_MAINTENANCE_INTERVAL);
 698         } else {
 699                 /* reconnect timeout has expired */
 700                 session_reconnect_expired(sess);
 701         }
 702 }
 703
 704 static int tgt_agent_rw_agent_state(struct fw_card *card, int tcode, void *data,
 705                 struct sbp_target_agent *agent)
 706 {
 707         int state;
 708
 709         switch (tcode) {
 710         case TCODE_READ_QUADLET_REQUEST:
 711                 pr_debug("tgt_agent AGENT_STATE READ\n");
 712
 713                 spin_lock_bh(&agent->lock);
 714                 state = agent->state;
 715                 spin_unlock_bh(&agent->lock);
 716
 717                 *(__be32 *)data = cpu_to_be32(state);
 718
 719                 return RCODE_COMPLETE;
 720
 721         case TCODE_WRITE_QUADLET_REQUEST:
 722                 /* ignored */
 723                 return RCODE_COMPLETE;
 724
 725         default:
 726                 return RCODE_TYPE_ERROR;
 727         }
 728 }
 729
 730 static int tgt_agent_rw_agent_reset(struct fw_card *card, int tcode, void *data,
 731                 struct sbp_target_agent *agent)
 732 {
 733         switch (tcode) {
 734         case TCODE_WRITE_QUADLET_REQUEST:
 735                 pr_debug("tgt_agent AGENT_RESET\n");
 736                 spin_lock_bh(&agent->lock);
 737                 agent->state = AGENT_STATE_RESET;
 738                 spin_unlock_bh(&agent->lock);
 739                 return RCODE_COMPLETE;
 740
 741         default:
 742                 return RCODE_TYPE_ERROR;
 743         }
 744 }
 745
 746 static int tgt_agent_rw_orb_pointer(struct fw_card *card, int tcode, void *data,
 747                 struct sbp_target_agent *agent)
 748 {
 749         struct sbp2_pointer *ptr = data;
 750
 751         switch (tcode) {
 752         case TCODE_WRITE_BLOCK_REQUEST:
 753                 spin_lock_bh(&agent->lock);
 754                 if (agent->state != AGENT_STATE_SUSPENDED &&
 755                                 agent->state != AGENT_STATE_RESET) {
 756                         spin_unlock_bh(&agent->lock);
 757                         pr_notice("Ignoring ORB_POINTER write while active.\n");
 758                         return RCODE_CONFLICT_ERROR;
 759                 }
 760                 agent->state = AGENT_STATE_ACTIVE;
 761                 spin_unlock_bh(&agent->lock);
 762
 763                 agent->orb_pointer = sbp2_pointer_to_addr(ptr);
 764                 agent->doorbell = false;
 765
 766                 pr_debug("tgt_agent ORB_POINTER write: 0x%llx\n",
 767                                 agent->orb_pointer);
 768
 769                 queue_work(system_unbound_wq, &agent->work);
 770
 771                 return RCODE_COMPLETE;
 772
 773         case TCODE_READ_BLOCK_REQUEST:
 774                 pr_debug("tgt_agent ORB_POINTER READ\n");
 775                 spin_lock_bh(&agent->lock);
 776                 addr_to_sbp2_pointer(agent->orb_pointer, ptr);
 777                 spin_unlock_bh(&agent->lock);
 778                 return RCODE_COMPLETE;
 779
 780         default:
 781                 return RCODE_TYPE_ERROR;
 782         }
 783 }
 784
 785 static int tgt_agent_rw_doorbell(struct fw_card *card, int tcode, void *data,
 786                 struct sbp_target_agent *agent)
 787 {
 788         switch (tcode) {
 789         case TCODE_WRITE_QUADLET_REQUEST:
 790                 spin_lock_bh(&agent->lock);
 791                 if (agent->state != AGENT_STATE_SUSPENDED) {
 792                         spin_unlock_bh(&agent->lock);
 793                         pr_debug("Ignoring DOORBELL while active.\n");
 794                         return RCODE_CONFLICT_ERROR;
 795                 }
 796                 agent->state = AGENT_STATE_ACTIVE;
 797                 spin_unlock_bh(&agent->lock);
 798
 799                 agent->doorbell = true;
 800
 801                 pr_debug("tgt_agent DOORBELL\n");
 802
 803                 queue_work(system_unbound_wq, &agent->work);
 804
 805                 return RCODE_COMPLETE;
 806
 807         case TCODE_READ_QUADLET_REQUEST:
 808                 return RCODE_COMPLETE;
 809
 810         default:
 811                 return RCODE_TYPE_ERROR;
 812         }
 813 }
 814
 815 static int tgt_agent_rw_unsolicited_status_enable(struct fw_card *card,
 816                 int tcode, void *data, struct sbp_target_agent *agent)
 817 {
 818         switch (tcode) {
 819         case TCODE_WRITE_QUADLET_REQUEST:
 820                 pr_debug("tgt_agent UNSOLICITED_STATUS_ENABLE\n");
 821                 /* ignored as we don't send unsolicited status */
 822                 return RCODE_COMPLETE;
 823
 824         case TCODE_READ_QUADLET_REQUEST:
 825                 return RCODE_COMPLETE;
 826
 827         default:
 828                 return RCODE_TYPE_ERROR;
 829         }
 830 }
 831
 832 static void tgt_agent_rw(struct fw_card *card, struct fw_request *request,
 833                 int tcode, int destination, int source, int generation,
 834                 unsigned long long offset, void *data, size_t length,
 835                 void *callback_data)
 836 {
 837         struct sbp_target_agent *agent = callback_data;
 838         struct sbp_session *sess = agent->login->sess;
 839         int sess_gen, sess_node, rcode;
 840
 841         spin_lock_bh(&sess->lock);
 842         sess_gen = sess->generation;
 843         sess_node = sess->node_id;
 844         spin_unlock_bh(&sess->lock);
 845
 846         if (generation != sess_gen) {
 847                 pr_notice("ignoring request with wrong generation\n");
 848                 rcode = RCODE_TYPE_ERROR;
 849                 goto out;
 850         }
 851
 852         if (source != sess_node) {
 853                 pr_notice("ignoring request from foreign node (%x != %x)\n",
 854                                 source, sess_node);
 855                 rcode = RCODE_TYPE_ERROR;
 856                 goto out;
 857         }
 858
 859         /* turn offset into the offset from the start of the block */
 860         offset -= agent->handler.offset;
 861
 862         if (offset == 0x00 && length == 4) {
 863                 /* AGENT_STATE */
 864                 rcode = tgt_agent_rw_agent_state(card, tcode, data, agent);
 865         } else if (offset == 0x04 && length == 4) {
 866                 /* AGENT_RESET */
 867                 rcode = tgt_agent_rw_agent_reset(card, tcode, data, agent);
 868         } else if (offset == 0x08 && length == 8) {
 869                 /* ORB_POINTER */
 870                 rcode = tgt_agent_rw_orb_pointer(card, tcode, data, agent);
 871         } else if (offset == 0x10 && length == 4) {
 872                 /* DOORBELL */
 873                 rcode = tgt_agent_rw_doorbell(card, tcode, data, agent);
 874         } else if (offset == 0x14 && length == 4) {
 875                 /* UNSOLICITED_STATUS_ENABLE */
 876                 rcode = tgt_agent_rw_unsolicited_status_enable(card, tcode,
 877                                 data, agent);
 878         } else {
 879                 rcode = RCODE_ADDRESS_ERROR;
 880         }
 881
 882 out:
 883         fw_send_response(card, request, rcode);
 884 }
 885
 886 static void sbp_handle_command(struct sbp_target_request *);
 887 static int sbp_send_status(struct sbp_target_request *);
 888 static void sbp_free_request(struct sbp_target_request *);
 889
 890 static void tgt_agent_process_work(struct work_struct *work)
 891 {
 892         struct sbp_target_request *req =
 893                 container_of(work, struct sbp_target_request, work);
 894
 895         pr_debug("tgt_orb ptr:0x%llx next_ORB:0x%llx data_descriptor:0x%llx misc:0x%x\n",
 896                         req->orb_pointer,
 897                         sbp2_pointer_to_addr(&req->orb.next_orb),
 898                         sbp2_pointer_to_addr(&req->orb.data_descriptor),
 899                         be32_to_cpu(req->orb.misc));
 900
 901         if (req->orb_pointer >> 32)
 902                 pr_debug("ORB with high bits set\n");
 903
 904         switch (ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc))) {
 905                 case 0:/* Format specified by this standard */
 906                         sbp_handle_command(req);
 907                         return;
 908                 case 1: /* Reserved for future standardization */
 909                 case 2: /* Vendor-dependent */
 910                         req->status.status |= cpu_to_be32(
 911                                         STATUS_BLOCK_RESP(
 912                                                 STATUS_RESP_REQUEST_COMPLETE) |
 913                                         STATUS_BLOCK_DEAD(0) |
 914                                         STATUS_BLOCK_LEN(1) |
 915                                         STATUS_BLOCK_SBP_STATUS(
 916                                                 SBP_STATUS_REQ_TYPE_NOTSUPP));
 917                         sbp_send_status(req);
 918                         sbp_free_request(req);
 919                         return;
 920                 case 3: /* Dummy ORB */
 921                         req->status.status |= cpu_to_be32(
 922                                         STATUS_BLOCK_RESP(
 923                                                 STATUS_RESP_REQUEST_COMPLETE) |
 924                                         STATUS_BLOCK_DEAD(0) |
 925                                         STATUS_BLOCK_LEN(1) |
 926                                         STATUS_BLOCK_SBP_STATUS(
 927                                                 SBP_STATUS_DUMMY_ORB_COMPLETE));
 928                         sbp_send_status(req);
 929                         sbp_free_request(req);
 930                         return;
 931                 default:
 932                         BUG();
 933         }
 934 }
 935
 936 /* used to double-check we haven't been issued an AGENT_RESET */
 937 static inline bool tgt_agent_check_active(struct sbp_target_agent *agent)
 938 {
 939         bool active;
 940
 941         spin_lock_bh(&agent->lock);
 942         active = (agent->state == AGENT_STATE_ACTIVE);
 943         spin_unlock_bh(&agent->lock);
 944
 945         return active;
 946 }
 947
 948 static void tgt_agent_fetch_work(struct work_struct *work)
 949 {
 950         struct sbp_target_agent *agent =
 951                 container_of(work, struct sbp_target_agent, work);
 952         struct sbp_session *sess = agent->login->sess;
 953         struct sbp_target_request *req;
 954         int ret;
 955         bool doorbell = agent->doorbell;
 956         u64 next_orb = agent->orb_pointer;
 957
 958         while (next_orb && tgt_agent_check_active(agent)) {
 959                 req = kzalloc(sizeof(*req), GFP_KERNEL);
 960                 if (!req) {
 961                         spin_lock_bh(&agent->lock);
 962                         agent->state = AGENT_STATE_DEAD;
 963                         spin_unlock_bh(&agent->lock);
 964                         return;
 965                 }
 966
 967                 req->login = agent->login;
 968                 req->orb_pointer = next_orb;
 969
 970                 req->status.status = cpu_to_be32(STATUS_BLOCK_ORB_OFFSET_HIGH(
 971                                         req->orb_pointer >> 32));
 972                 req->status.orb_low = cpu_to_be32(
 973                                 req->orb_pointer & 0xfffffffc);
 974
 975                 /* read in the ORB */
 976                 ret = sbp_run_transaction(sess->card, TCODE_READ_BLOCK_REQUEST,
 977                                 sess->node_id, sess->generation, sess->speed,
 978                                 req->orb_pointer, &req->orb, sizeof(req->orb));
 979                 if (ret != RCODE_COMPLETE) {
 980                         pr_debug("tgt_orb fetch failed: %x\n", ret);
 981                         req->status.status |= cpu_to_be32(
 982                                         STATUS_BLOCK_SRC(
 983                                                 STATUS_SRC_ORB_FINISHED) |
 984                                         STATUS_BLOCK_RESP(
 985                                                 STATUS_RESP_TRANSPORT_FAILURE) |
 986                                         STATUS_BLOCK_DEAD(1) |
 987                                         STATUS_BLOCK_LEN(1) |
 988                                         STATUS_BLOCK_SBP_STATUS(
 989                                                 SBP_STATUS_UNSPECIFIED_ERROR));
 990                         spin_lock_bh(&agent->lock);
 991                         agent->state = AGENT_STATE_DEAD;
 992                         spin_unlock_bh(&agent->lock);
 993
 994                         sbp_send_status(req);
 995                         sbp_free_request(req);
 996                         return;
 997                 }
 998
 999                 /* check the next_ORB field */
1000                 if (be32_to_cpu(req->orb.next_orb.high) & 0x80000000) {
1001                         next_orb = 0;
1002                         req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC(
1003                                                 STATUS_SRC_ORB_FINISHED));
1004                 } else {
1005                         next_orb = sbp2_pointer_to_addr(&req->orb.next_orb);
1006                         req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC(
1007                                                 STATUS_SRC_ORB_CONTINUING));
1008                 }
1009
1010                 if (tgt_agent_check_active(agent) && !doorbell) {
1011                         INIT_WORK(&req->work, tgt_agent_process_work);
1012                         queue_work(system_unbound_wq, &req->work);
1013                 } else {
1014                         /* don't process this request, just check next_ORB */
1015                         sbp_free_request(req);
1016                 }
1017
1018                 spin_lock_bh(&agent->lock);
1019                 doorbell = agent->doorbell = false;
1020
1021                 /* check if we should carry on processing */
1022                 if (next_orb)
1023                         agent->orb_pointer = next_orb;
1024                 else
1025                         agent->state = AGENT_STATE_SUSPENDED;
1026
1027                 spin_unlock_bh(&agent->lock);
1028         };
1029 }
1030
1031 static struct sbp_target_agent *sbp_target_agent_register(
1032                 struct sbp_login_descriptor *login)
1033 {
1034         struct sbp_target_agent *agent;
1035         int ret;
1036
1037         agent = kmalloc(sizeof(*agent), GFP_KERNEL);
1038         if (!agent)
1039                 return ERR_PTR(-ENOMEM);
1040
1041         spin_lock_init(&agent->lock);
1042
1043         agent->handler.length = 0x20;
1044         agent->handler.address_callback = tgt_agent_rw;
1045         agent->handler.callback_data = agent;
1046
1047         agent->login = login;
1048         agent->state = AGENT_STATE_RESET;
1049         INIT_WORK(&agent->work, tgt_agent_fetch_work);
1050         agent->orb_pointer = 0;
1051         agent->doorbell = false;
1052
1053         ret = fw_core_add_address_handler(&agent->handler,
1054                         &sbp_register_region);
1055         if (ret < 0) {
1056                 kfree(agent);
1057                 return ERR_PTR(ret);
1058         }
1059
1060         return agent;
1061 }
1062
1063 static void sbp_target_agent_unregister(struct sbp_target_agent *agent)
1064 {
1065         fw_core_remove_address_handler(&agent->handler);
1066         cancel_work_sync(&agent->work);
1067         kfree(agent);
1068 }
1069
1070 /*
1071  * Simple wrapper around fw_run_transaction that retries the transaction several
1072  * times in case of failure, with an exponential backoff.
1073  */
1074 static int sbp_run_transaction(struct fw_card *card, int tcode, int destination_id,
1075                 int generation, int speed, unsigned long long offset,
1076                 void *payload, size_t length)
1077 {
1078         int attempt, ret, delay;
1079
1080         for (attempt = 1; attempt <= 5; attempt++) {
1081                 ret = fw_run_transaction(card, tcode, destination_id,
1082                                 generation, speed, offset, payload, length);
1083
1084                 switch (ret) {
1085                 case RCODE_COMPLETE:
1086                 case RCODE_TYPE_ERROR:
1087                 case RCODE_ADDRESS_ERROR:
1088                 case RCODE_GENERATION:
1089                         return ret;
1090
1091                 default:
1092                         delay = 5 * attempt * attempt;
1093                         usleep_range(delay, delay * 2);
1094                 }
1095         }
1096
1097         return ret;
1098 }
1099
1100 /*
1101  * Wrapper around sbp_run_transaction that gets the card, destination,
1102  * generation and speed out of the request's session.
1103  */
1104 static int sbp_run_request_transaction(struct sbp_target_request *req,
1105                 int tcode, unsigned long long offset, void *payload,
1106                 size_t length)
1107 {
1108         struct sbp_login_descriptor *login = req->login;
1109         struct sbp_session *sess = login->sess;
1110         struct fw_card *card;
1111         int node_id, generation, speed, ret;
1112
1113         spin_lock_bh(&sess->lock);
1114         card = fw_card_get(sess->card);
1115         node_id = sess->node_id;
1116         generation = sess->generation;
1117         speed = sess->speed;
1118         spin_unlock_bh(&sess->lock);
1119
1120         ret = sbp_run_transaction(card, tcode, node_id, generation, speed,
1121                         offset, payload, length);
1122
1123         fw_card_put(card);
1124
1125         return ret;
1126 }
1127
1128 static int sbp_fetch_command(struct sbp_target_request *req)
1129 {
1130         int ret, cmd_len, copy_len;
1131
1132         cmd_len = scsi_command_size(req->orb.command_block);
1133
1134         req->cmd_buf = kmalloc(cmd_len, GFP_KERNEL);
1135         if (!req->cmd_buf)
1136                 return -ENOMEM;
1137
1138         memcpy(req->cmd_buf, req->orb.command_block,
1139                 min_t(int, cmd_len, sizeof(req->orb.command_block)));
1140
1141         if (cmd_len > sizeof(req->orb.command_block)) {
1142                 pr_debug("sbp_fetch_command: filling in long command\n");
1143                 copy_len = cmd_len - sizeof(req->orb.command_block);
1144
1145                 ret = sbp_run_request_transaction(req,
1146                                 TCODE_READ_BLOCK_REQUEST,
1147                                 req->orb_pointer + sizeof(req->orb),
1148                                 req->cmd_buf + sizeof(req->orb.command_block),
1149                                 copy_len);
1150                 if (ret != RCODE_COMPLETE)
1151                         return -EIO;
1152         }
1153
1154         return 0;
1155 }
1156
1157 static int sbp_fetch_page_table(struct sbp_target_request *req)
1158 {
1159         int pg_tbl_sz, ret;
1160         struct sbp_page_table_entry *pg_tbl;
1161
1162         if (!CMDBLK_ORB_PG_TBL_PRESENT(be32_to_cpu(req->orb.misc)))
1163                 return 0;
1164
1165         pg_tbl_sz = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc)) *
1166                 sizeof(struct sbp_page_table_entry);
1167
1168         pg_tbl = kmalloc(pg_tbl_sz, GFP_KERNEL);
1169         if (!pg_tbl)
1170                 return -ENOMEM;
1171
1172         ret = sbp_run_request_transaction(req, TCODE_READ_BLOCK_REQUEST,
1173                         sbp2_pointer_to_addr(&req->orb.data_descriptor),
1174                         pg_tbl, pg_tbl_sz);
1175         if (ret != RCODE_COMPLETE) {
1176                 kfree(pg_tbl);
1177                 return -EIO;
1178         }
1179
1180         req->pg_tbl = pg_tbl;
1181         return 0;
1182 }
1183
1184 static void sbp_calc_data_length_direction(struct sbp_target_request *req,
1185         u32 *data_len, enum dma_data_direction *data_dir)
1186 {
1187         int data_size, direction, idx;
1188
1189         data_size = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc));
1190         direction = CMDBLK_ORB_DIRECTION(be32_to_cpu(req->orb.misc));
1191
1192         if (!data_size) {
1193                 *data_len = 0;
1194                 *data_dir = DMA_NONE;
1195                 return;
1196         }
1197
1198         *data_dir = direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1199
1200         if (req->pg_tbl) {
1201                 *data_len = 0;
1202                 for (idx = 0; idx < data_size; idx++) {
1203                         *data_len += be16_to_cpu(
1204                                         req->pg_tbl[idx].segment_length);
1205                 }
1206         } else {
1207                 *data_len = data_size;
1208         }
1209 }
1210
1211 static void sbp_handle_command(struct sbp_target_request *req)
1212 {
1213         struct sbp_login_descriptor *login = req->login;
1214         struct sbp_session *sess = login->sess;
1215         int ret, unpacked_lun;
1216         u32 data_length;
1217         enum dma_data_direction data_dir;
1218
1219         ret = sbp_fetch_command(req);
1220         if (ret) {
1221                 pr_debug("sbp_handle_command: fetch command failed: %d\n", ret);
1222                 goto err;
1223         }
1224
1225         ret = sbp_fetch_page_table(req);
1226         if (ret) {
1227                 pr_debug("sbp_handle_command: fetch page table failed: %d\n",
1228                         ret);
1229                 goto err;
1230         }
1231
1232         unpacked_lun = req->login->lun->unpacked_lun;
1233         sbp_calc_data_length_direction(req, &data_length, &data_dir);
1234
1235         pr_debug("sbp_handle_command ORB:0x%llx unpacked_lun:%d data_len:%d data_dir:%d\n",
1236                         req->orb_pointer, unpacked_lun, data_length, data_dir);
1237
1238         if (target_submit_cmd(&req->se_cmd, sess->se_sess, req->cmd_buf,
1239                               req->sense_buf, unpacked_lun, data_length,
1240                               MSG_SIMPLE_TAG, data_dir, 0))
1241                 goto err;
1242
1243         return;
1244
1245 err:
1246         req->status.status |= cpu_to_be32(
1247                 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1248                 STATUS_BLOCK_DEAD(0) |
1249                 STATUS_BLOCK_LEN(1) |
1250                 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1251         sbp_send_status(req);
1252         sbp_free_request(req);
1253 }
1254
1255 /*
1256  * DMA_TO_DEVICE = read from initiator (SCSI WRITE)
1257  * DMA_FROM_DEVICE = write to initiator (SCSI READ)
1258  */
1259 static int sbp_rw_data(struct sbp_target_request *req)
1260 {
1261         struct sbp_session *sess = req->login->sess;
1262         int tcode, sg_miter_flags, max_payload, pg_size, speed, node_id,
1263                 generation, num_pte, length, tfr_length,
1264                 rcode = RCODE_COMPLETE;
1265         struct sbp_page_table_entry *pte;
1266         unsigned long long offset;
1267         struct fw_card *card;
1268         struct sg_mapping_iter iter;
1269
1270         if (req->se_cmd.data_direction == DMA_FROM_DEVICE) {
1271                 tcode = TCODE_WRITE_BLOCK_REQUEST;
1272                 sg_miter_flags = SG_MITER_FROM_SG;
1273         } else {
1274                 tcode = TCODE_READ_BLOCK_REQUEST;
1275                 sg_miter_flags = SG_MITER_TO_SG;
1276         }
1277
1278         max_payload = 4 << CMDBLK_ORB_MAX_PAYLOAD(be32_to_cpu(req->orb.misc));
1279         speed = CMDBLK_ORB_SPEED(be32_to_cpu(req->orb.misc));
1280
1281         pg_size = CMDBLK_ORB_PG_SIZE(be32_to_cpu(req->orb.misc));
1282         if (pg_size) {
1283                 pr_err("sbp_run_transaction: page size ignored\n");
1284                 pg_size = 0x100 << pg_size;
1285         }
1286
1287         spin_lock_bh(&sess->lock);
1288         card = fw_card_get(sess->card);
1289         node_id = sess->node_id;
1290         generation = sess->generation;
1291         spin_unlock_bh(&sess->lock);
1292
1293         if (req->pg_tbl) {
1294                 pte = req->pg_tbl;
1295                 num_pte = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc));
1296
1297                 offset = 0;
1298                 length = 0;
1299         } else {
1300                 pte = NULL;
1301                 num_pte = 0;
1302
1303                 offset = sbp2_pointer_to_addr(&req->orb.data_descriptor);
1304                 length = req->se_cmd.data_length;
1305         }
1306
1307         sg_miter_start(&iter, req->se_cmd.t_data_sg, req->se_cmd.t_data_nents,
1308                 sg_miter_flags);
1309
1310         while (length || num_pte) {
1311                 if (!length) {
1312                         offset = (u64)be16_to_cpu(pte->segment_base_hi) << 32 |
1313                                 be32_to_cpu(pte->segment_base_lo);
1314                         length = be16_to_cpu(pte->segment_length);
1315
1316                         pte++;
1317                         num_pte--;
1318                 }
1319
1320                 sg_miter_next(&iter);
1321
1322                 tfr_length = min3(length, max_payload, (int)iter.length);
1323
1324                 /* FIXME: take page_size into account */
1325
1326                 rcode = sbp_run_transaction(card, tcode, node_id,
1327                                 generation, speed,
1328                                 offset, iter.addr, tfr_length);
1329
1330                 if (rcode != RCODE_COMPLETE)
1331                         break;
1332
1333                 length -= tfr_length;
1334                 offset += tfr_length;
1335                 iter.consumed = tfr_length;
1336         }
1337
1338         sg_miter_stop(&iter);
1339         fw_card_put(card);
1340
1341         if (rcode == RCODE_COMPLETE) {
1342                 WARN_ON(length != 0);
1343                 return 0;
1344         } else {
1345                 return -EIO;
1346         }
1347 }
1348
1349 static int sbp_send_status(struct sbp_target_request *req)
1350 {
1351         int ret, length;
1352         struct sbp_login_descriptor *login = req->login;
1353
1354         length = (((be32_to_cpu(req->status.status) >> 24) & 0x07) + 1) * 4;
1355
1356         ret = sbp_run_request_transaction(req, TCODE_WRITE_BLOCK_REQUEST,
1357                         login->status_fifo_addr, &req->status, length);
1358         if (ret != RCODE_COMPLETE) {
1359                 pr_debug("sbp_send_status: write failed: 0x%x\n", ret);
1360                 return -EIO;
1361         }
1362
1363         pr_debug("sbp_send_status: status write complete for ORB: 0x%llx\n",
1364                         req->orb_pointer);
1365
1366         return 0;
1367 }
1368
1369 static void sbp_sense_mangle(struct sbp_target_request *req)
1370 {
1371         struct se_cmd *se_cmd = &req->se_cmd;
1372         u8 *sense = req->sense_buf;
1373         u8 *status = req->status.data;
1374
1375         WARN_ON(se_cmd->scsi_sense_length < 18);
1376
1377         switch (sense[0] & 0x7f) {              /* sfmt */
1378         case 0x70: /* current, fixed */
1379                 status[0] = 0 << 6;
1380                 break;
1381         case 0x71: /* deferred, fixed */
1382                 status[0] = 1 << 6;
1383                 break;
1384         case 0x72: /* current, descriptor */
1385         case 0x73: /* deferred, descriptor */
1386         default:
1387                 /*
1388                  * TODO: SBP-3 specifies what we should do with descriptor
1389                  * format sense data
1390                  */
1391                 pr_err("sbp_send_sense: unknown sense format: 0x%x\n",
1392                         sense[0]);
1393                 req->status.status |= cpu_to_be32(
1394                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1395                         STATUS_BLOCK_DEAD(0) |
1396                         STATUS_BLOCK_LEN(1) |
1397                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQUEST_ABORTED));
1398                 return;
1399         }
1400
1401         status[0] |= se_cmd->scsi_status & 0x3f;/* status */
1402         status[1] =
1403                 (sense[0] & 0x80) |             /* valid */
1404                 ((sense[2] & 0xe0) >> 1) |      /* mark, eom, ili */
1405                 (sense[2] & 0x0f);              /* sense_key */
1406         status[2] = se_cmd->scsi_asc;           /* sense_code */
1407         status[3] = se_cmd->scsi_ascq;          /* sense_qualifier */
1408
1409         /* information */
1410         status[4] = sense[3];
1411         status[5] = sense[4];
1412         status[6] = sense[5];
1413         status[7] = sense[6];
1414
1415         /* CDB-dependent */
1416         status[8] = sense[8];
1417         status[9] = sense[9];
1418         status[10] = sense[10];
1419         status[11] = sense[11];
1420
1421         /* fru */
1422         status[12] = sense[14];
1423
1424         /* sense_key-dependent */
1425         status[13] = sense[15];
1426         status[14] = sense[16];
1427         status[15] = sense[17];
1428
1429         req->status.status |= cpu_to_be32(
1430                 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1431                 STATUS_BLOCK_DEAD(0) |
1432                 STATUS_BLOCK_LEN(5) |
1433                 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
1434 }
1435
1436 static int sbp_send_sense(struct sbp_target_request *req)
1437 {
1438         struct se_cmd *se_cmd = &req->se_cmd;
1439
1440         if (se_cmd->scsi_sense_length) {
1441                 sbp_sense_mangle(req);
1442         } else {
1443                 req->status.status |= cpu_to_be32(
1444                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1445                         STATUS_BLOCK_DEAD(0) |
1446                         STATUS_BLOCK_LEN(1) |
1447                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
1448         }
1449
1450         return sbp_send_status(req);
1451 }
1452
1453 static void sbp_free_request(struct sbp_target_request *req)
1454 {
1455         kfree(req->pg_tbl);
1456         kfree(req->cmd_buf);
1457         kfree(req);
1458 }
1459
1460 static void sbp_mgt_agent_process(struct work_struct *work)
1461 {
1462         struct sbp_management_agent *agent =
1463                 container_of(work, struct sbp_management_agent, work);
1464         struct sbp_management_request *req = agent->request;
1465         int ret;
1466         int status_data_len = 0;
1467
1468         /* fetch the ORB from the initiator */
1469         ret = sbp_run_transaction(req->card, TCODE_READ_BLOCK_REQUEST,
1470                 req->node_addr, req->generation, req->speed,
1471                 agent->orb_offset, &req->orb, sizeof(req->orb));
1472         if (ret != RCODE_COMPLETE) {
1473                 pr_debug("mgt_orb fetch failed: %x\n", ret);
1474                 goto out;
1475         }
1476
1477         pr_debug("mgt_orb ptr1:0x%llx ptr2:0x%llx misc:0x%x len:0x%x status_fifo:0x%llx\n",
1478                 sbp2_pointer_to_addr(&req->orb.ptr1),
1479                 sbp2_pointer_to_addr(&req->orb.ptr2),
1480                 be32_to_cpu(req->orb.misc), be32_to_cpu(req->orb.length),
1481                 sbp2_pointer_to_addr(&req->orb.status_fifo));
1482
1483         if (!ORB_NOTIFY(be32_to_cpu(req->orb.misc)) ||
1484                 ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc)) != 0) {
1485                 pr_err("mgt_orb bad request\n");
1486                 goto out;
1487         }
1488
1489         switch (MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc))) {
1490         case MANAGEMENT_ORB_FUNCTION_LOGIN:
1491                 sbp_management_request_login(agent, req, &status_data_len);
1492                 break;
1493
1494         case MANAGEMENT_ORB_FUNCTION_QUERY_LOGINS:
1495                 sbp_management_request_query_logins(agent, req,
1496                                 &status_data_len);
1497                 break;
1498
1499         case MANAGEMENT_ORB_FUNCTION_RECONNECT:
1500                 sbp_management_request_reconnect(agent, req, &status_data_len);
1501                 break;
1502
1503         case MANAGEMENT_ORB_FUNCTION_SET_PASSWORD:
1504                 pr_notice("SET PASSWORD not implemented\n");
1505
1506                 req->status.status = cpu_to_be32(
1507                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1508                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1509
1510                 break;
1511
1512         case MANAGEMENT_ORB_FUNCTION_LOGOUT:
1513                 sbp_management_request_logout(agent, req, &status_data_len);
1514                 break;
1515
1516         case MANAGEMENT_ORB_FUNCTION_ABORT_TASK:
1517                 pr_notice("ABORT TASK not implemented\n");
1518
1519                 req->status.status = cpu_to_be32(
1520                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1521                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1522
1523                 break;
1524
1525         case MANAGEMENT_ORB_FUNCTION_ABORT_TASK_SET:
1526                 pr_notice("ABORT TASK SET not implemented\n");
1527
1528                 req->status.status = cpu_to_be32(
1529                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1530                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1531
1532                 break;
1533
1534         case MANAGEMENT_ORB_FUNCTION_LOGICAL_UNIT_RESET:
1535                 pr_notice("LOGICAL UNIT RESET not implemented\n");
1536
1537                 req->status.status = cpu_to_be32(
1538                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1539                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1540
1541                 break;
1542
1543         case MANAGEMENT_ORB_FUNCTION_TARGET_RESET:
1544                 pr_notice("TARGET RESET not implemented\n");
1545
1546                 req->status.status = cpu_to_be32(
1547                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1548                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1549
1550                 break;
1551
1552         default:
1553                 pr_notice("unknown management function 0x%x\n",
1554                         MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc)));
1555
1556                 req->status.status = cpu_to_be32(
1557                         STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1558                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1559
1560                 break;
1561         }
1562
1563         req->status.status |= cpu_to_be32(
1564                 STATUS_BLOCK_SRC(1) | /* Response to ORB, next_ORB absent */
1565                 STATUS_BLOCK_LEN(DIV_ROUND_UP(status_data_len, 4) + 1) |
1566                 STATUS_BLOCK_ORB_OFFSET_HIGH(agent->orb_offset >> 32));
1567         req->status.orb_low = cpu_to_be32(agent->orb_offset);
1568
1569         /* write the status block back to the initiator */
1570         ret = sbp_run_transaction(req->card, TCODE_WRITE_BLOCK_REQUEST,
1571                 req->node_addr, req->generation, req->speed,
1572                 sbp2_pointer_to_addr(&req->orb.status_fifo),
1573                 &req->status, 8 + status_data_len);
1574         if (ret != RCODE_COMPLETE) {
1575                 pr_debug("mgt_orb status write failed: %x\n", ret);
1576                 goto out;
1577         }
1578
1579 out:
1580         fw_card_put(req->card);
1581         kfree(req);
1582
1583         spin_lock_bh(&agent->lock);
1584         agent->state = MANAGEMENT_AGENT_STATE_IDLE;
1585         spin_unlock_bh(&agent->lock);
1586 }
1587
1588 static void sbp_mgt_agent_rw(struct fw_card *card,
1589         struct fw_request *request, int tcode, int destination, int source,
1590         int generation, unsigned long long offset, void *data, size_t length,
1591         void *callback_data)
1592 {
1593         struct sbp_management_agent *agent = callback_data;
1594         struct sbp2_pointer *ptr = data;
1595         int rcode = RCODE_ADDRESS_ERROR;
1596
1597         if (!agent->tport->enable)
1598                 goto out;
1599
1600         if ((offset != agent->handler.offset) || (length != 8))
1601                 goto out;
1602
1603         if (tcode == TCODE_WRITE_BLOCK_REQUEST) {
1604                 struct sbp_management_request *req;
1605                 int prev_state;
1606
1607                 spin_lock_bh(&agent->lock);
1608                 prev_state = agent->state;
1609                 agent->state = MANAGEMENT_AGENT_STATE_BUSY;
1610                 spin_unlock_bh(&agent->lock);
1611
1612                 if (prev_state == MANAGEMENT_AGENT_STATE_BUSY) {
1613                         pr_notice("ignoring management request while busy\n");
1614                         rcode = RCODE_CONFLICT_ERROR;
1615                         goto out;
1616                 }
1617
1618                 req = kzalloc(sizeof(*req), GFP_ATOMIC);
1619                 if (!req) {
1620                         rcode = RCODE_CONFLICT_ERROR;
1621                         goto out;
1622                 }
1623
1624                 req->card = fw_card_get(card);
1625                 req->generation = generation;
1626                 req->node_addr = source;
1627                 req->speed = fw_get_request_speed(request);
1628
1629                 agent->orb_offset = sbp2_pointer_to_addr(ptr);
1630                 agent->request = req;
1631
1632                 queue_work(system_unbound_wq, &agent->work);
1633                 rcode = RCODE_COMPLETE;
1634         } else if (tcode == TCODE_READ_BLOCK_REQUEST) {
1635                 addr_to_sbp2_pointer(agent->orb_offset, ptr);
1636                 rcode = RCODE_COMPLETE;
1637         } else {
1638                 rcode = RCODE_TYPE_ERROR;
1639         }
1640
1641 out:
1642         fw_send_response(card, request, rcode);
1643 }
1644
1645 static struct sbp_management_agent *sbp_management_agent_register(
1646                 struct sbp_tport *tport)
1647 {
1648         int ret;
1649         struct sbp_management_agent *agent;
1650
1651         agent = kmalloc(sizeof(*agent), GFP_KERNEL);
1652         if (!agent)
1653                 return ERR_PTR(-ENOMEM);
1654
1655         spin_lock_init(&agent->lock);
1656         agent->tport = tport;
1657         agent->handler.length = 0x08;
1658         agent->handler.address_callback = sbp_mgt_agent_rw;
1659         agent->handler.callback_data = agent;
1660         agent->state = MANAGEMENT_AGENT_STATE_IDLE;
1661         INIT_WORK(&agent->work, sbp_mgt_agent_process);
1662         agent->orb_offset = 0;
1663         agent->request = NULL;
1664
1665         ret = fw_core_add_address_handler(&agent->handler,
1666                         &sbp_register_region);
1667         if (ret < 0) {
1668                 kfree(agent);
1669                 return ERR_PTR(ret);
1670         }
1671
1672         return agent;
1673 }
1674
1675 static void sbp_management_agent_unregister(struct sbp_management_agent *agent)
1676 {
1677         fw_core_remove_address_handler(&agent->handler);
1678         cancel_work_sync(&agent->work);
1679         kfree(agent);
1680 }
1681
1682 static int sbp_check_true(struct se_portal_group *se_tpg)
1683 {
1684         return 1;
1685 }
1686
1687 static int sbp_check_false(struct se_portal_group *se_tpg)
1688 {
1689         return 0;
1690 }
1691
1692 static char *sbp_get_fabric_name(void)
1693 {
1694         return "sbp";
1695 }
1696
1697 static char *sbp_get_fabric_wwn(struct se_portal_group *se_tpg)
1698 {
1699         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1700         struct sbp_tport *tport = tpg->tport;
1701
1702         return &tport->tport_name[0];
1703 }
1704
1705 static u16 sbp_get_tag(struct se_portal_group *se_tpg)
1706 {
1707         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1708         return tpg->tport_tpgt;
1709 }
1710
1711 static u32 sbp_get_default_depth(struct se_portal_group *se_tpg)
1712 {
1713         return 1;
1714 }
1715
1716 static struct se_node_acl *sbp_alloc_fabric_acl(struct se_portal_group *se_tpg)
1717 {
1718         struct sbp_nacl *nacl;
1719
1720         nacl = kzalloc(sizeof(struct sbp_nacl), GFP_KERNEL);
1721         if (!nacl) {
1722                 pr_err("Unable to allocate struct sbp_nacl\n");
1723                 return NULL;
1724         }
1725
1726         return &nacl->se_node_acl;
1727 }
1728
1729 static void sbp_release_fabric_acl(
1730         struct se_portal_group *se_tpg,
1731         struct se_node_acl *se_nacl)
1732 {
1733         struct sbp_nacl *nacl =
1734                 container_of(se_nacl, struct sbp_nacl, se_node_acl);
1735         kfree(nacl);
1736 }
1737
1738 static u32 sbp_tpg_get_inst_index(struct se_portal_group *se_tpg)
1739 {
1740         return 1;
1741 }
1742
1743 static void sbp_release_cmd(struct se_cmd *se_cmd)
1744 {
1745         struct sbp_target_request *req = container_of(se_cmd,
1746                         struct sbp_target_request, se_cmd);
1747
1748         sbp_free_request(req);
1749 }
1750
1751 static int sbp_shutdown_session(struct se_session *se_sess)
1752 {
1753         return 0;
1754 }
1755
1756 static void sbp_close_session(struct se_session *se_sess)
1757 {
1758         return;
1759 }
1760
1761 static u32 sbp_sess_get_index(struct se_session *se_sess)
1762 {
1763         return 0;
1764 }
1765
1766 static int sbp_write_pending(struct se_cmd *se_cmd)
1767 {
1768         struct sbp_target_request *req = container_of(se_cmd,
1769                         struct sbp_target_request, se_cmd);
1770         int ret;
1771
1772         ret = sbp_rw_data(req);
1773         if (ret) {
1774                 req->status.status |= cpu_to_be32(
1775                         STATUS_BLOCK_RESP(
1776                                 STATUS_RESP_TRANSPORT_FAILURE) |
1777                         STATUS_BLOCK_DEAD(0) |
1778                         STATUS_BLOCK_LEN(1) |
1779                         STATUS_BLOCK_SBP_STATUS(
1780                                 SBP_STATUS_UNSPECIFIED_ERROR));
1781                 sbp_send_status(req);
1782                 return ret;
1783         }
1784
1785         target_execute_cmd(se_cmd);
1786         return 0;
1787 }
1788
1789 static int sbp_write_pending_status(struct se_cmd *se_cmd)
1790 {
1791         return 0;
1792 }
1793
1794 static void sbp_set_default_node_attrs(struct se_node_acl *nacl)
1795 {
1796         return;
1797 }
1798
1799 static u32 sbp_get_task_tag(struct se_cmd *se_cmd)
1800 {
1801         struct sbp_target_request *req = container_of(se_cmd,
1802                         struct sbp_target_request, se_cmd);
1803
1804         /* only used for printk until we do TMRs */
1805         return (u32)req->orb_pointer;
1806 }
1807
1808 static int sbp_get_cmd_state(struct se_cmd *se_cmd)
1809 {
1810         return 0;
1811 }
1812
1813 static int sbp_queue_data_in(struct se_cmd *se_cmd)
1814 {
1815         struct sbp_target_request *req = container_of(se_cmd,
1816                         struct sbp_target_request, se_cmd);
1817         int ret;
1818
1819         ret = sbp_rw_data(req);
1820         if (ret) {
1821                 req->status.status |= cpu_to_be32(
1822                         STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1823                         STATUS_BLOCK_DEAD(0) |
1824                         STATUS_BLOCK_LEN(1) |
1825                         STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1826                 sbp_send_status(req);
1827                 return ret;
1828         }
1829
1830         return sbp_send_sense(req);
1831 }
1832
1833 /*
1834  * Called after command (no data transfer) or after the write (to device)
1835  * operation is completed
1836  */
1837 static int sbp_queue_status(struct se_cmd *se_cmd)
1838 {
1839         struct sbp_target_request *req = container_of(se_cmd,
1840                         struct sbp_target_request, se_cmd);
1841
1842         return sbp_send_sense(req);
1843 }
1844
1845 static int sbp_queue_tm_rsp(struct se_cmd *se_cmd)
1846 {
1847         return 0;
1848 }
1849
1850 static int sbp_check_stop_free(struct se_cmd *se_cmd)
1851 {
1852         struct sbp_target_request *req = container_of(se_cmd,
1853                         struct sbp_target_request, se_cmd);
1854
1855         transport_generic_free_cmd(&req->se_cmd, 0);
1856         return 1;
1857 }
1858
1859 /*
1860  * Handlers for Serial Bus Protocol 2/3 (SBP-2 / SBP-3)
1861  */
1862 static u8 sbp_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1863 {
1864         /*
1865          * Return a IEEE 1394 SCSI Protocol identifier for loopback operations
1866          * This is defined in section 7.5.1 Table 362 in spc4r17
1867          */
1868         return SCSI_PROTOCOL_SBP;
1869 }
1870
1871 static u32 sbp_get_pr_transport_id(
1872         struct se_portal_group *se_tpg,
1873         struct se_node_acl *se_nacl,
1874         struct t10_pr_registration *pr_reg,
1875         int *format_code,
1876         unsigned char *buf)
1877 {
1878         int ret;
1879
1880         /*
1881          * Set PROTOCOL IDENTIFIER to 3h for SBP
1882          */
1883         buf[0] = SCSI_PROTOCOL_SBP;
1884         /*
1885          * From spc4r17, 7.5.4.4 TransportID for initiator ports using SCSI
1886          * over IEEE 1394
1887          */
1888         ret = hex2bin(&buf[8], se_nacl->initiatorname, 8);
1889         if (ret < 0)
1890                 pr_debug("sbp transport_id: invalid hex string\n");
1891
1892         /*
1893          * The IEEE 1394 Transport ID is a hardcoded 24-byte length
1894          */
1895         return 24;
1896 }
1897
1898 static u32 sbp_get_pr_transport_id_len(
1899         struct se_portal_group *se_tpg,
1900         struct se_node_acl *se_nacl,
1901         struct t10_pr_registration *pr_reg,
1902         int *format_code)
1903 {
1904         *format_code = 0;
1905         /*
1906          * From spc4r17, 7.5.4.4 TransportID for initiator ports using SCSI
1907          * over IEEE 1394
1908          *
1909          * The SBP Transport ID is a hardcoded 24-byte length
1910          */
1911         return 24;
1912 }
1913
1914 /*
1915  * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
1916  * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
1917  */
1918 static char *sbp_parse_pr_out_transport_id(
1919         struct se_portal_group *se_tpg,
1920         const char *buf,
1921         u32 *out_tid_len,
1922         char **port_nexus_ptr)
1923 {
1924         /*
1925          * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.4 TransportID
1926          * for initiator ports using SCSI over SBP Serial SCSI Protocol
1927          *
1928          * The TransportID for a IEEE 1394 Initiator Port is of fixed size of
1929          * 24 bytes, and IEEE 1394 does not contain a I_T nexus identifier,
1930          * so we return the **port_nexus_ptr set to NULL.
1931          */
1932         *port_nexus_ptr = NULL;
1933         *out_tid_len = 24;
1934
1935         return (char *)&buf[8];
1936 }
1937
1938 static int sbp_count_se_tpg_luns(struct se_portal_group *tpg)
1939 {
1940         int i, count = 0;
1941
1942         spin_lock(&tpg->tpg_lun_lock);
1943         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1944                 struct se_lun *se_lun = tpg->tpg_lun_list[i];
1945
1946                 if (se_lun->lun_status == TRANSPORT_LUN_STATUS_FREE)
1947                         continue;
1948
1949                 count++;
1950         }
1951         spin_unlock(&tpg->tpg_lun_lock);
1952
1953         return count;
1954 }
1955
1956 static int sbp_update_unit_directory(struct sbp_tport *tport)
1957 {
1958         int num_luns, num_entries, idx = 0, mgt_agt_addr, ret, i;
1959         u32 *data;
1960
1961         if (tport->unit_directory.data) {
1962                 fw_core_remove_descriptor(&tport->unit_directory);
1963                 kfree(tport->unit_directory.data);
1964                 tport->unit_directory.data = NULL;
1965         }
1966
1967         if (!tport->enable || !tport->tpg)
1968                 return 0;
1969
1970         num_luns = sbp_count_se_tpg_luns(&tport->tpg->se_tpg);
1971
1972         /*
1973          * Number of entries in the final unit directory:
1974          *  - all of those in the template
1975          *  - management_agent
1976          *  - unit_characteristics
1977          *  - reconnect_timeout
1978          *  - unit unique ID
1979          *  - one for each LUN
1980          *
1981          *  MUST NOT include leaf or sub-directory entries
1982          */
1983         num_entries = ARRAY_SIZE(sbp_unit_directory_template) + 4 + num_luns;
1984
1985         if (tport->directory_id != -1)
1986                 num_entries++;
1987
1988         /* allocate num_entries + 4 for the header and unique ID leaf */
1989         data = kcalloc((num_entries + 4), sizeof(u32), GFP_KERNEL);
1990         if (!data)
1991                 return -ENOMEM;
1992
1993         /* directory_length */
1994         data[idx++] = num_entries << 16;
1995
1996         /* directory_id */
1997         if (tport->directory_id != -1)
1998                 data[idx++] = (CSR_DIRECTORY_ID << 24) | tport->directory_id;
1999
2000         /* unit directory template */
2001         memcpy(&data[idx], sbp_unit_directory_template,
2002                         sizeof(sbp_unit_directory_template));
2003         idx += ARRAY_SIZE(sbp_unit_directory_template);
2004
2005         /* management_agent */
2006         mgt_agt_addr = (tport->mgt_agt->handler.offset - CSR_REGISTER_BASE) / 4;
2007         data[idx++] = 0x54000000 | (mgt_agt_addr & 0x00ffffff);
2008
2009         /* unit_characteristics */
2010         data[idx++] = 0x3a000000 |
2011                 (((tport->mgt_orb_timeout * 2) << 8) & 0xff00) |
2012                 SBP_ORB_FETCH_SIZE;
2013
2014         /* reconnect_timeout */
2015         data[idx++] = 0x3d000000 | (tport->max_reconnect_timeout & 0xffff);
2016
2017         /* unit unique ID (leaf is just after LUNs) */
2018         data[idx++] = 0x8d000000 | (num_luns + 1);
2019
2020         spin_lock(&tport->tpg->se_tpg.tpg_lun_lock);
2021         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
2022                 struct se_lun *se_lun = tport->tpg->se_tpg.tpg_lun_list[i];
2023                 struct se_device *dev;
2024                 int type;
2025
2026                 if (se_lun->lun_status == TRANSPORT_LUN_STATUS_FREE)
2027                         continue;
2028
2029                 spin_unlock(&tport->tpg->se_tpg.tpg_lun_lock);
2030
2031                 dev = se_lun->lun_se_dev;
2032                 type = dev->transport->get_device_type(dev);
2033
2034                 /* logical_unit_number */
2035                 data[idx++] = 0x14000000 |
2036                         ((type << 16) & 0x1f0000) |
2037                         (se_lun->unpacked_lun & 0xffff);
2038
2039                 spin_lock(&tport->tpg->se_tpg.tpg_lun_lock);
2040         }
2041         spin_unlock(&tport->tpg->se_tpg.tpg_lun_lock);
2042
2043         /* unit unique ID leaf */
2044         data[idx++] = 2 << 16;
2045         data[idx++] = tport->guid >> 32;
2046         data[idx++] = tport->guid;
2047
2048         tport->unit_directory.length = idx;
2049         tport->unit_directory.key = (CSR_DIRECTORY | CSR_UNIT) << 24;
2050         tport->unit_directory.data = data;
2051
2052         ret = fw_core_add_descriptor(&tport->unit_directory);
2053         if (ret < 0) {
2054                 kfree(tport->unit_directory.data);
2055                 tport->unit_directory.data = NULL;
2056         }
2057
2058         return ret;
2059 }
2060
2061 static ssize_t sbp_parse_wwn(const char *name, u64 *wwn)
2062 {
2063         const char *cp;
2064         char c, nibble;
2065         int pos = 0, err;
2066
2067         *wwn = 0;
2068         for (cp = name; cp < &name[SBP_NAMELEN - 1]; cp++) {
2069                 c = *cp;
2070                 if (c == '\n' && cp[1] == '\0')
2071                         continue;
2072                 if (c == '\0') {
2073                         err = 2;
2074                         if (pos != 16)
2075                                 goto fail;
2076                         return cp - name;
2077                 }
2078                 err = 3;
2079                 if (isdigit(c))
2080                         nibble = c - '0';
2081                 else if (isxdigit(c))
2082                         nibble = tolower(c) - 'a' + 10;
2083                 else
2084                         goto fail;
2085                 *wwn = (*wwn << 4) | nibble;
2086                 pos++;
2087         }
2088         err = 4;
2089 fail:
2090         printk(KERN_INFO "err %u len %zu pos %u\n",
2091                         err, cp - name, pos);
2092         return -1;
2093 }
2094
2095 static ssize_t sbp_format_wwn(char *buf, size_t len, u64 wwn)
2096 {
2097         return snprintf(buf, len, "%016llx", wwn);
2098 }
2099
2100 static struct se_node_acl *sbp_make_nodeacl(
2101                 struct se_portal_group *se_tpg,
2102                 struct config_group *group,
2103                 const char *name)
2104 {
2105         struct se_node_acl *se_nacl, *se_nacl_new;
2106         struct sbp_nacl *nacl;
2107         u64 guid = 0;
2108         u32 nexus_depth = 1;
2109
2110         if (sbp_parse_wwn(name, &guid) < 0)
2111                 return ERR_PTR(-EINVAL);
2112
2113         se_nacl_new = sbp_alloc_fabric_acl(se_tpg);
2114         if (!se_nacl_new)
2115                 return ERR_PTR(-ENOMEM);
2116
2117         /*
2118          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
2119          * when converting a NodeACL from demo mode -> explict
2120          */
2121         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
2122                         name, nexus_depth);
2123         if (IS_ERR(se_nacl)) {
2124                 sbp_release_fabric_acl(se_tpg, se_nacl_new);
2125                 return se_nacl;
2126         }
2127
2128         nacl = container_of(se_nacl, struct sbp_nacl, se_node_acl);
2129         nacl->guid = guid;
2130         sbp_format_wwn(nacl->iport_name, SBP_NAMELEN, guid);
2131
2132         return se_nacl;
2133 }
2134
2135 static void sbp_drop_nodeacl(struct se_node_acl *se_acl)
2136 {
2137         struct sbp_nacl *nacl =
2138                 container_of(se_acl, struct sbp_nacl, se_node_acl);
2139
2140         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
2141         kfree(nacl);
2142 }
2143
2144 static int sbp_post_link_lun(
2145                 struct se_portal_group *se_tpg,
2146                 struct se_lun *se_lun)
2147 {
2148         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2149
2150         return sbp_update_unit_directory(tpg->tport);
2151 }
2152
2153 static void sbp_pre_unlink_lun(
2154                 struct se_portal_group *se_tpg,
2155                 struct se_lun *se_lun)
2156 {
2157         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2158         struct sbp_tport *tport = tpg->tport;
2159         int ret;
2160
2161         if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0)
2162                 tport->enable = 0;
2163
2164         ret = sbp_update_unit_directory(tport);
2165         if (ret < 0)
2166                 pr_err("unlink LUN: failed to update unit directory\n");
2167 }
2168
2169 static struct se_portal_group *sbp_make_tpg(
2170                 struct se_wwn *wwn,
2171                 struct config_group *group,
2172                 const char *name)
2173 {
2174         struct sbp_tport *tport =
2175                 container_of(wwn, struct sbp_tport, tport_wwn);
2176
2177         struct sbp_tpg *tpg;
2178         unsigned long tpgt;
2179         int ret;
2180
2181         if (strstr(name, "tpgt_") != name)
2182                 return ERR_PTR(-EINVAL);
2183         if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
2184                 return ERR_PTR(-EINVAL);
2185
2186         if (tport->tpg) {
2187                 pr_err("Only one TPG per Unit is possible.\n");
2188                 return ERR_PTR(-EBUSY);
2189         }
2190
2191         tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2192         if (!tpg) {
2193                 pr_err("Unable to allocate struct sbp_tpg\n");
2194                 return ERR_PTR(-ENOMEM);
2195         }
2196
2197         tpg->tport = tport;
2198         tpg->tport_tpgt = tpgt;
2199         tport->tpg = tpg;
2200
2201         /* default attribute values */
2202         tport->enable = 0;
2203         tport->directory_id = -1;
2204         tport->mgt_orb_timeout = 15;
2205         tport->max_reconnect_timeout = 5;
2206         tport->max_logins_per_lun = 1;
2207
2208         tport->mgt_agt = sbp_management_agent_register(tport);
2209         if (IS_ERR(tport->mgt_agt)) {
2210                 ret = PTR_ERR(tport->mgt_agt);
2211                 goto out_free_tpg;
2212         }
2213
2214         ret = core_tpg_register(&sbp_fabric_configfs->tf_ops, wwn,
2215                         &tpg->se_tpg, (void *)tpg,
2216                         TRANSPORT_TPG_TYPE_NORMAL);
2217         if (ret < 0)
2218                 goto out_unreg_mgt_agt;
2219
2220         return &tpg->se_tpg;
2221
2222 out_unreg_mgt_agt:
2223         sbp_management_agent_unregister(tport->mgt_agt);
2224 out_free_tpg:
2225         tport->tpg = NULL;
2226         kfree(tpg);
2227         return ERR_PTR(ret);
2228 }
2229
2230 static void sbp_drop_tpg(struct se_portal_group *se_tpg)
2231 {
2232         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2233         struct sbp_tport *tport = tpg->tport;
2234
2235         core_tpg_deregister(se_tpg);
2236         sbp_management_agent_unregister(tport->mgt_agt);
2237         tport->tpg = NULL;
2238         kfree(tpg);
2239 }
2240
2241 static struct se_wwn *sbp_make_tport(
2242                 struct target_fabric_configfs *tf,
2243                 struct config_group *group,
2244                 const char *name)
2245 {
2246         struct sbp_tport *tport;
2247         u64 guid = 0;
2248
2249         if (sbp_parse_wwn(name, &guid) < 0)
2250                 return ERR_PTR(-EINVAL);
2251
2252         tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2253         if (!tport) {
2254                 pr_err("Unable to allocate struct sbp_tport\n");
2255                 return ERR_PTR(-ENOMEM);
2256         }
2257
2258         tport->guid = guid;
2259         sbp_format_wwn(tport->tport_name, SBP_NAMELEN, guid);
2260
2261         return &tport->tport_wwn;
2262 }
2263
2264 static void sbp_drop_tport(struct se_wwn *wwn)
2265 {
2266         struct sbp_tport *tport =
2267                 container_of(wwn, struct sbp_tport, tport_wwn);
2268
2269         kfree(tport);
2270 }
2271
2272 static ssize_t sbp_wwn_show_attr_version(
2273                 struct target_fabric_configfs *tf,
2274                 char *page)
2275 {
2276         return sprintf(page, "FireWire SBP fabric module %s\n", SBP_VERSION);
2277 }
2278
2279 TF_WWN_ATTR_RO(sbp, version);
2280
2281 static struct configfs_attribute *sbp_wwn_attrs[] = {
2282         &sbp_wwn_version.attr,
2283         NULL,
2284 };
2285
2286 static ssize_t sbp_tpg_show_directory_id(
2287                 struct se_portal_group *se_tpg,
2288                 char *page)
2289 {
2290         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2291         struct sbp_tport *tport = tpg->tport;
2292
2293         if (tport->directory_id == -1)
2294                 return sprintf(page, "implicit\n");
2295         else
2296                 return sprintf(page, "%06x\n", tport->directory_id);
2297 }
2298
2299 static ssize_t sbp_tpg_store_directory_id(
2300                 struct se_portal_group *se_tpg,
2301                 const char *page,
2302                 size_t count)
2303 {
2304         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2305         struct sbp_tport *tport = tpg->tport;
2306         unsigned long val;
2307
2308         if (tport->enable) {
2309                 pr_err("Cannot change the directory_id on an active target.\n");
2310                 return -EBUSY;
2311         }
2312
2313         if (strstr(page, "implicit") == page) {
2314                 tport->directory_id = -1;
2315         } else {
2316                 if (kstrtoul(page, 16, &val) < 0)
2317                         return -EINVAL;
2318                 if (val > 0xffffff)
2319                         return -EINVAL;
2320
2321                 tport->directory_id = val;
2322         }
2323
2324         return count;
2325 }
2326
2327 static ssize_t sbp_tpg_show_enable(
2328                 struct se_portal_group *se_tpg,
2329                 char *page)
2330 {
2331         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2332         struct sbp_tport *tport = tpg->tport;
2333         return sprintf(page, "%d\n", tport->enable);
2334 }
2335
2336 static ssize_t sbp_tpg_store_enable(
2337                 struct se_portal_group *se_tpg,
2338                 const char *page,
2339                 size_t count)
2340 {
2341         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2342         struct sbp_tport *tport = tpg->tport;
2343         unsigned long val;
2344         int ret;
2345
2346         if (kstrtoul(page, 0, &val) < 0)
2347                 return -EINVAL;
2348         if ((val != 0) && (val != 1))
2349                 return -EINVAL;
2350
2351         if (tport->enable == val)
2352                 return count;
2353
2354         if (val) {
2355                 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) {
2356                         pr_err("Cannot enable a target with no LUNs!\n");
2357                         return -EINVAL;
2358                 }
2359         } else {
2360                 /* XXX: force-shutdown sessions instead? */
2361                 spin_lock_bh(&se_tpg->session_lock);
2362                 if (!list_empty(&se_tpg->tpg_sess_list)) {
2363                         spin_unlock_bh(&se_tpg->session_lock);
2364                         return -EBUSY;
2365                 }
2366                 spin_unlock_bh(&se_tpg->session_lock);
2367         }
2368
2369         tport->enable = val;
2370
2371         ret = sbp_update_unit_directory(tport);
2372         if (ret < 0) {
2373                 pr_err("Could not update Config ROM\n");
2374                 return ret;
2375         }
2376
2377         return count;
2378 }
2379
2380 TF_TPG_BASE_ATTR(sbp, directory_id, S_IRUGO | S_IWUSR);
2381 TF_TPG_BASE_ATTR(sbp, enable, S_IRUGO | S_IWUSR);
2382
2383 static struct configfs_attribute *sbp_tpg_base_attrs[] = {
2384         &sbp_tpg_directory_id.attr,
2385         &sbp_tpg_enable.attr,
2386         NULL,
2387 };
2388
2389 static ssize_t sbp_tpg_attrib_show_mgt_orb_timeout(
2390                 struct se_portal_group *se_tpg,
2391                 char *page)
2392 {
2393         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2394         struct sbp_tport *tport = tpg->tport;
2395         return sprintf(page, "%d\n", tport->mgt_orb_timeout);
2396 }
2397
2398 static ssize_t sbp_tpg_attrib_store_mgt_orb_timeout(
2399                 struct se_portal_group *se_tpg,
2400                 const char *page,
2401                 size_t count)
2402 {
2403         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2404         struct sbp_tport *tport = tpg->tport;
2405         unsigned long val;
2406         int ret;
2407
2408         if (kstrtoul(page, 0, &val) < 0)
2409                 return -EINVAL;
2410         if ((val < 1) || (val > 127))
2411                 return -EINVAL;
2412
2413         if (tport->mgt_orb_timeout == val)
2414                 return count;
2415
2416         tport->mgt_orb_timeout = val;
2417
2418         ret = sbp_update_unit_directory(tport);
2419         if (ret < 0)
2420                 return ret;
2421
2422         return count;
2423 }
2424
2425 static ssize_t sbp_tpg_attrib_show_max_reconnect_timeout(
2426                 struct se_portal_group *se_tpg,
2427                 char *page)
2428 {
2429         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2430         struct sbp_tport *tport = tpg->tport;
2431         return sprintf(page, "%d\n", tport->max_reconnect_timeout);
2432 }
2433
2434 static ssize_t sbp_tpg_attrib_store_max_reconnect_timeout(
2435                 struct se_portal_group *se_tpg,
2436                 const char *page,
2437                 size_t count)
2438 {
2439         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2440         struct sbp_tport *tport = tpg->tport;
2441         unsigned long val;
2442         int ret;
2443
2444         if (kstrtoul(page, 0, &val) < 0)
2445                 return -EINVAL;
2446         if ((val < 1) || (val > 32767))
2447                 return -EINVAL;
2448
2449         if (tport->max_reconnect_timeout == val)
2450                 return count;
2451
2452         tport->max_reconnect_timeout = val;
2453
2454         ret = sbp_update_unit_directory(tport);
2455         if (ret < 0)
2456                 return ret;
2457
2458         return count;
2459 }
2460
2461 static ssize_t sbp_tpg_attrib_show_max_logins_per_lun(
2462                 struct se_portal_group *se_tpg,
2463                 char *page)
2464 {
2465         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2466         struct sbp_tport *tport = tpg->tport;
2467         return sprintf(page, "%d\n", tport->max_logins_per_lun);
2468 }
2469
2470 static ssize_t sbp_tpg_attrib_store_max_logins_per_lun(
2471                 struct se_portal_group *se_tpg,
2472                 const char *page,
2473                 size_t count)
2474 {
2475         struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2476         struct sbp_tport *tport = tpg->tport;
2477         unsigned long val;
2478
2479         if (kstrtoul(page, 0, &val) < 0)
2480                 return -EINVAL;
2481         if ((val < 1) || (val > 127))
2482                 return -EINVAL;
2483
2484         /* XXX: also check against current count? */
2485
2486         tport->max_logins_per_lun = val;
2487
2488         return count;
2489 }
2490
2491 TF_TPG_ATTRIB_ATTR(sbp, mgt_orb_timeout, S_IRUGO | S_IWUSR);
2492 TF_TPG_ATTRIB_ATTR(sbp, max_reconnect_timeout, S_IRUGO | S_IWUSR);
2493 TF_TPG_ATTRIB_ATTR(sbp, max_logins_per_lun, S_IRUGO | S_IWUSR);
2494
2495 static struct configfs_attribute *sbp_tpg_attrib_attrs[] = {
2496         &sbp_tpg_attrib_mgt_orb_timeout.attr,
2497         &sbp_tpg_attrib_max_reconnect_timeout.attr,
2498         &sbp_tpg_attrib_max_logins_per_lun.attr,
2499         NULL,
2500 };
2501
2502 static struct target_core_fabric_ops sbp_ops = {
2503         .get_fabric_name                = sbp_get_fabric_name,
2504         .get_fabric_proto_ident         = sbp_get_fabric_proto_ident,
2505         .tpg_get_wwn                    = sbp_get_fabric_wwn,
2506         .tpg_get_tag                    = sbp_get_tag,
2507         .tpg_get_default_depth          = sbp_get_default_depth,
2508         .tpg_get_pr_transport_id        = sbp_get_pr_transport_id,
2509         .tpg_get_pr_transport_id_len    = sbp_get_pr_transport_id_len,
2510         .tpg_parse_pr_out_transport_id  = sbp_parse_pr_out_transport_id,
2511         .tpg_check_demo_mode            = sbp_check_true,
2512         .tpg_check_demo_mode_cache      = sbp_check_true,
2513         .tpg_check_demo_mode_write_protect = sbp_check_false,
2514         .tpg_check_prod_mode_write_protect = sbp_check_false,
2515         .tpg_alloc_fabric_acl           = sbp_alloc_fabric_acl,
2516         .tpg_release_fabric_acl         = sbp_release_fabric_acl,
2517         .tpg_get_inst_index             = sbp_tpg_get_inst_index,
2518         .release_cmd                    = sbp_release_cmd,
2519         .shutdown_session               = sbp_shutdown_session,
2520         .close_session                  = sbp_close_session,
2521         .sess_get_index                 = sbp_sess_get_index,
2522         .write_pending                  = sbp_write_pending,
2523         .write_pending_status           = sbp_write_pending_status,
2524         .set_default_node_attributes    = sbp_set_default_node_attrs,
2525         .get_task_tag                   = sbp_get_task_tag,
2526         .get_cmd_state                  = sbp_get_cmd_state,
2527         .queue_data_in                  = sbp_queue_data_in,
2528         .queue_status                   = sbp_queue_status,
2529         .queue_tm_rsp                   = sbp_queue_tm_rsp,
2530         .check_stop_free                = sbp_check_stop_free,
2531
2532         .fabric_make_wwn                = sbp_make_tport,
2533         .fabric_drop_wwn                = sbp_drop_tport,
2534         .fabric_make_tpg                = sbp_make_tpg,
2535         .fabric_drop_tpg                = sbp_drop_tpg,
2536         .fabric_post_link               = sbp_post_link_lun,
2537         .fabric_pre_unlink              = sbp_pre_unlink_lun,
2538         .fabric_make_np                 = NULL,
2539         .fabric_drop_np                 = NULL,
2540         .fabric_make_nodeacl            = sbp_make_nodeacl,
2541         .fabric_drop_nodeacl            = sbp_drop_nodeacl,
2542 };
2543
2544 static int sbp_register_configfs(void)
2545 {
2546         struct target_fabric_configfs *fabric;
2547         int ret;
2548
2549         fabric = target_fabric_configfs_init(THIS_MODULE, "sbp");
2550         if (IS_ERR(fabric)) {
2551                 pr_err("target_fabric_configfs_init() failed\n");
2552                 return PTR_ERR(fabric);
2553         }
2554
2555         fabric->tf_ops = sbp_ops;
2556
2557         /*
2558          * Setup default attribute lists for various fabric->tf_cit_tmpl
2559          */
2560         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = sbp_wwn_attrs;
2561         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = sbp_tpg_base_attrs;
2562         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = sbp_tpg_attrib_attrs;
2563         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
2564         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
2565         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2566         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2567         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2568         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
2569
2570         ret = target_fabric_configfs_register(fabric);
2571         if (ret < 0) {
2572                 pr_err("target_fabric_configfs_register() failed for SBP\n");
2573                 return ret;
2574         }
2575
2576         sbp_fabric_configfs = fabric;
2577
2578         return 0;
2579 };
2580
2581 static void sbp_deregister_configfs(void)
2582 {
2583         if (!sbp_fabric_configfs)
2584                 return;
2585
2586         target_fabric_configfs_deregister(sbp_fabric_configfs);
2587         sbp_fabric_configfs = NULL;
2588 };
2589
2590 static int __init sbp_init(void)
2591 {
2592         int ret;
2593
2594         ret = sbp_register_configfs();
2595         if (ret < 0)
2596                 return ret;
2597
2598         return 0;
2599 };
2600
2601 static void __exit sbp_exit(void)
2602 {
2603         sbp_deregister_configfs();
2604 };
2605
2606 MODULE_DESCRIPTION("FireWire SBP fabric driver");
2607 MODULE_LICENSE("GPL");
2608 module_init(sbp_init);
2609 module_exit(sbp_exit);