1 /* 2 * This file is part of the zfcp device driver for 3 * FCP adapters for IBM System z9 and zSeries. 4 * 5 * (C) Copyright IBM Corp. 2002, 2006 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI 23 24 #include "zfcp_ext.h" 25 26 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); 27 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); 28 static int zfcp_scsi_slave_configure(struct scsi_device *sdp); 29 static int zfcp_scsi_queuecommand(struct scsi_cmnd *, 30 void (*done) (struct scsi_cmnd *)); 31 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); 32 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); 33 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); 34 static int zfcp_task_management_function(struct zfcp_unit *, u8, 35 struct scsi_cmnd *); 36 37 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, 38 unsigned int, unsigned int); 39 40 static struct device_attribute *zfcp_sysfs_sdev_attrs[]; 41 42 struct zfcp_data zfcp_data = { 43 .scsi_host_template = { 44 .name = ZFCP_NAME, 45 .module = THIS_MODULE, 46 .proc_name = "zfcp", 47 .slave_alloc = zfcp_scsi_slave_alloc, 48 .slave_configure = zfcp_scsi_slave_configure, 49 .slave_destroy = zfcp_scsi_slave_destroy, 50 .queuecommand = zfcp_scsi_queuecommand, 51 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 52 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 53 .eh_bus_reset_handler = zfcp_scsi_eh_host_reset_handler, 54 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 55 .can_queue = 4096, 56 .this_id = -1, 57 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, 58 .cmd_per_lun = 1, 59 .use_clustering = 1, 60 .sdev_attrs = zfcp_sysfs_sdev_attrs, 61 .max_sectors = ZFCP_MAX_SECTORS, 62 }, 63 .driver_version = ZFCP_VERSION, 64 }; 65 66 /* Find start of Response Information in FCP response unit*/ 67 char * 68 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 69 { 70 char *fcp_rsp_info_ptr; 71 72 fcp_rsp_info_ptr = 73 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 74 75 return fcp_rsp_info_ptr; 76 } 77 78 /* Find start of Sense Information in FCP response unit*/ 79 char * 80 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 81 { 82 char *fcp_sns_info_ptr; 83 84 fcp_sns_info_ptr = 85 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 86 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) 87 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + 88 fcp_rsp_iu->fcp_rsp_len; 89 90 return fcp_sns_info_ptr; 91 } 92 93 static fcp_dl_t * 94 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) 95 { 96 int additional_length = fcp_cmd->add_fcp_cdb_length << 2; 97 fcp_dl_t *fcp_dl_addr; 98 99 fcp_dl_addr = (fcp_dl_t *) 100 ((unsigned char *) fcp_cmd + 101 sizeof (struct fcp_cmnd_iu) + additional_length); 102 /* 103 * fcp_dl_addr = start address of fcp_cmnd structure + 104 * size of fixed part + size of dynamically sized add_dcp_cdb field 105 * SEE FCP-2 documentation 106 */ 107 return fcp_dl_addr; 108 } 109 110 fcp_dl_t 111 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) 112 { 113 return *zfcp_get_fcp_dl_ptr(fcp_cmd); 114 } 115 116 void 117 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) 118 { 119 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; 120 } 121 122 /* 123 * note: it's a bit-or operation not an assignment 124 * regarding the specified byte 125 */ 126 static inline void 127 set_byte(int *result, char status, char pos) 128 { 129 *result |= status << (pos * 8); 130 } 131 132 void 133 set_host_byte(int *result, char status) 134 { 135 set_byte(result, status, 2); 136 } 137 138 void 139 set_driver_byte(int *result, char status) 140 { 141 set_byte(result, status, 3); 142 } 143 144 static int 145 zfcp_scsi_slave_alloc(struct scsi_device *sdp) 146 { 147 struct zfcp_adapter *adapter; 148 struct zfcp_unit *unit; 149 unsigned long flags; 150 int retval = -ENXIO; 151 152 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; 153 if (!adapter) 154 goto out; 155 156 read_lock_irqsave(&zfcp_data.config_lock, flags); 157 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); 158 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, 159 &unit->status)) { 160 sdp->hostdata = unit; 161 unit->device = sdp; 162 zfcp_unit_get(unit); 163 retval = 0; 164 } 165 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 166 out: 167 return retval; 168 } 169 170 /** 171 * zfcp_scsi_slave_destroy - called when scsi device is removed 172 * 173 * Remove reference to associated scsi device for an zfcp_unit. 174 * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs 175 * or a scan for this device might have failed. 176 */ 177 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) 178 { 179 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; 180 181 if (unit) { 182 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); 183 sdpnt->hostdata = NULL; 184 unit->device = NULL; 185 zfcp_erp_unit_failed(unit); 186 zfcp_unit_put(unit); 187 } else { 188 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " 189 "address %p\n", sdpnt); 190 } 191 } 192 193 /* 194 * called from scsi midlayer to allow finetuning of a device. 195 */ 196 static int 197 zfcp_scsi_slave_configure(struct scsi_device *sdp) 198 { 199 if (sdp->tagged_supported) 200 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); 201 else 202 scsi_adjust_queue_depth(sdp, 0, 1); 203 return 0; 204 } 205 206 /** 207 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function 208 * @scpnt: pointer to struct scsi_cmnd where result is set 209 * @result: result to be set in scpnt (e.g. DID_ERROR) 210 */ 211 static void 212 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 213 { 214 set_host_byte(&scpnt->result, result); 215 if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) 216 zfcp_scsi_dbf_event_result("fail", 4, 217 (struct zfcp_adapter*) scpnt->device->host->hostdata[0], 218 scpnt, NULL); 219 /* return directly */ 220 scpnt->scsi_done(scpnt); 221 } 222 223 /** 224 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and 225 * zfcp_scsi_command_sync 226 * @adapter: adapter where scsi command is issued 227 * @unit: unit to which scsi command is sent 228 * @scpnt: scsi command to be sent 229 * @timer: timer to be started if request is successfully initiated 230 * 231 * Note: In scsi_done function must be set in scpnt. 232 */ 233 int 234 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, 235 struct scsi_cmnd *scpnt, int use_timer) 236 { 237 int tmp; 238 int retval; 239 240 retval = 0; 241 242 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); 243 BUG_ON(scpnt->scsi_done == NULL); 244 245 if (unlikely(NULL == unit)) { 246 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 247 goto out; 248 } 249 250 if (unlikely( 251 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || 252 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { 253 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " 254 "0x%016Lx on adapter %s\n", 255 unit->fcp_lun, unit->port->wwpn, 256 zfcp_get_busid_by_adapter(adapter)); 257 zfcp_scsi_command_fail(scpnt, DID_ERROR); 258 goto out; 259 } 260 261 if (unlikely( 262 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { 263 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " 264 "on port 0x%016Lx in recovery\n", 265 zfcp_get_busid_by_unit(unit), 266 unit->fcp_lun, unit->port->wwpn); 267 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 268 goto out; 269 } 270 271 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer, 272 ZFCP_REQ_AUTO_CLEANUP); 273 274 if (unlikely(tmp < 0)) { 275 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); 276 retval = SCSI_MLQUEUE_HOST_BUSY; 277 } 278 279 out: 280 return retval; 281 } 282 283 static void 284 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) 285 { 286 struct completion *wait = (struct completion *) scpnt->SCp.ptr; 287 complete(wait); 288 } 289 290 291 /** 292 * zfcp_scsi_command_sync - send a SCSI command and wait for completion 293 * @unit: unit where command is sent to 294 * @scpnt: scsi command to be sent 295 * @use_timer: indicates whether timer should be setup or not 296 * Return: 0 297 * 298 * Errors are indicated in scpnt->result 299 */ 300 int 301 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, 302 int use_timer) 303 { 304 int ret; 305 DECLARE_COMPLETION_ONSTACK(wait); 306 307 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ 308 scpnt->scsi_done = zfcp_scsi_command_sync_handler; 309 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, 310 use_timer); 311 if (ret == 0) 312 wait_for_completion(&wait); 313 314 scpnt->SCp.ptr = NULL; 315 316 return 0; 317 } 318 319 /* 320 * function: zfcp_scsi_queuecommand 321 * 322 * purpose: enqueues a SCSI command to the specified target device 323 * 324 * returns: 0 - success, SCSI command enqueued 325 * !0 - failure 326 */ 327 static int 328 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, 329 void (*done) (struct scsi_cmnd *)) 330 { 331 struct zfcp_unit *unit; 332 struct zfcp_adapter *adapter; 333 334 /* reset the status for this request */ 335 scpnt->result = 0; 336 scpnt->host_scribble = NULL; 337 scpnt->scsi_done = done; 338 339 /* 340 * figure out adapter and target device 341 * (stored there by zfcp_scsi_slave_alloc) 342 */ 343 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; 344 unit = (struct zfcp_unit *) scpnt->device->hostdata; 345 346 return zfcp_scsi_command_async(adapter, unit, scpnt, 0); 347 } 348 349 static struct zfcp_unit * 350 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, 351 unsigned int lun) 352 { 353 struct zfcp_port *port; 354 struct zfcp_unit *unit, *retval = NULL; 355 356 list_for_each_entry(port, &adapter->port_list_head, list) { 357 if (!port->rport || (id != port->rport->scsi_target_id)) 358 continue; 359 list_for_each_entry(unit, &port->unit_list_head, list) { 360 if (lun == unit->scsi_lun) { 361 retval = unit; 362 goto out; 363 } 364 } 365 } 366 out: 367 return retval; 368 } 369 370 /** 371 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command 372 * @scpnt: pointer to scsi_cmnd to be aborted 373 * Return: SUCCESS - command has been aborted and cleaned up in internal 374 * bookkeeping, SCSI stack won't be called for aborted command 375 * FAILED - otherwise 376 * 377 * We do not need to care for a SCSI command which completes normally 378 * but late during this abort routine runs. We are allowed to return 379 * late commands to the SCSI stack. It tracks the state of commands and 380 * will handle late commands. (Usually, the normal completion of late 381 * commands is ignored with respect to the running abort operation.) 382 */ 383 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 384 { 385 struct Scsi_Host *scsi_host; 386 struct zfcp_adapter *adapter; 387 struct zfcp_unit *unit; 388 struct zfcp_fsf_req *fsf_req; 389 unsigned long flags; 390 unsigned long old_req_id; 391 int retval = SUCCESS; 392 393 scsi_host = scpnt->device->host; 394 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; 395 unit = (struct zfcp_unit *) scpnt->device->hostdata; 396 397 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", 398 scpnt, zfcp_get_busid_by_adapter(adapter)); 399 400 /* avoid race condition between late normal completion and abort */ 401 write_lock_irqsave(&adapter->abort_lock, flags); 402 403 /* Check whether corresponding fsf_req is still pending */ 404 spin_lock(&adapter->req_list_lock); 405 fsf_req = zfcp_reqlist_ismember(adapter, (unsigned long) 406 scpnt->host_scribble); 407 spin_unlock(&adapter->req_list_lock); 408 if (!fsf_req) { 409 write_unlock_irqrestore(&adapter->abort_lock, flags); 410 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0); 411 retval = SUCCESS; 412 goto out; 413 } 414 fsf_req->data = 0; 415 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; 416 old_req_id = fsf_req->req_id; 417 418 /* don't access old fsf_req after releasing the abort_lock */ 419 write_unlock_irqrestore(&adapter->abort_lock, flags); 420 421 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0); 422 if (!fsf_req) { 423 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); 424 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, 425 old_req_id); 426 retval = FAILED; 427 goto out; 428 } 429 430 __wait_event(fsf_req->completion_wq, 431 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 432 433 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { 434 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0); 435 retval = SUCCESS; 436 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { 437 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0); 438 retval = SUCCESS; 439 } else { 440 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0); 441 retval = FAILED; 442 } 443 zfcp_fsf_req_free(fsf_req); 444 out: 445 return retval; 446 } 447 448 static int 449 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 450 { 451 int retval; 452 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; 453 454 if (!unit) { 455 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); 456 retval = SUCCESS; 457 goto out; 458 } 459 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); 460 461 /* 462 * If we do not know whether the unit supports 'logical unit reset' 463 * then try 'logical unit reset' and proceed with 'target reset' 464 * if 'logical unit reset' fails. 465 * If the unit is known not to support 'logical unit reset' then 466 * skip 'logical unit reset' and try 'target reset' immediately. 467 */ 468 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 469 &unit->status)) { 470 retval = zfcp_task_management_function(unit, 471 FCP_LOGICAL_UNIT_RESET, 472 scpnt); 473 if (retval) { 474 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); 475 if (retval == -ENOTSUPP) 476 atomic_set_mask 477 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 478 &unit->status); 479 /* fall through and try 'target reset' next */ 480 } else { 481 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", 482 unit); 483 /* avoid 'target reset' */ 484 retval = SUCCESS; 485 goto out; 486 } 487 } 488 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); 489 if (retval) { 490 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); 491 retval = FAILED; 492 } else { 493 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); 494 retval = SUCCESS; 495 } 496 out: 497 return retval; 498 } 499 500 static int 501 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, 502 struct scsi_cmnd *scpnt) 503 { 504 struct zfcp_adapter *adapter = unit->port->adapter; 505 struct zfcp_fsf_req *fsf_req; 506 int retval = 0; 507 508 /* issue task management function */ 509 fsf_req = zfcp_fsf_send_fcp_command_task_management 510 (adapter, unit, tm_flags, 0); 511 if (!fsf_req) { 512 ZFCP_LOG_INFO("error: creation of task management request " 513 "failed for unit 0x%016Lx on port 0x%016Lx on " 514 "adapter %s\n", unit->fcp_lun, unit->port->wwpn, 515 zfcp_get_busid_by_adapter(adapter)); 516 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); 517 retval = -ENOMEM; 518 goto out; 519 } 520 521 __wait_event(fsf_req->completion_wq, 522 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 523 524 /* 525 * check completion status of task management function 526 */ 527 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 528 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); 529 retval = -EIO; 530 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { 531 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); 532 retval = -ENOTSUPP; 533 } else 534 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); 535 536 zfcp_fsf_req_free(fsf_req); 537 out: 538 return retval; 539 } 540 541 /** 542 * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset 543 */ 544 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 545 { 546 struct zfcp_unit *unit; 547 struct zfcp_adapter *adapter; 548 549 unit = (struct zfcp_unit*) scpnt->device->hostdata; 550 adapter = unit->port->adapter; 551 552 ZFCP_LOG_NORMAL("host/bus reset because of problems with " 553 "unit 0x%016Lx\n", unit->fcp_lun); 554 555 zfcp_erp_adapter_reopen(adapter, 0); 556 zfcp_erp_wait(adapter); 557 558 return SUCCESS; 559 } 560 561 int 562 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) 563 { 564 int retval = 0; 565 static unsigned int unique_id = 0; 566 567 /* register adapter as SCSI host with mid layer of SCSI stack */ 568 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, 569 sizeof (struct zfcp_adapter *)); 570 if (!adapter->scsi_host) { 571 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " 572 "for adapter %s ", 573 zfcp_get_busid_by_adapter(adapter)); 574 retval = -EIO; 575 goto out; 576 } 577 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); 578 579 /* tell the SCSI stack some characteristics of this adapter */ 580 adapter->scsi_host->max_id = 1; 581 adapter->scsi_host->max_lun = 1; 582 adapter->scsi_host->max_channel = 0; 583 adapter->scsi_host->unique_id = unique_id++; /* FIXME */ 584 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; 585 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; 586 587 /* 588 * save a pointer to our own adapter data structure within 589 * hostdata field of SCSI host data structure 590 */ 591 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 592 593 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 594 scsi_host_put(adapter->scsi_host); 595 retval = -EIO; 596 goto out; 597 } 598 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 599 out: 600 return retval; 601 } 602 603 void 604 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) 605 { 606 struct Scsi_Host *shost; 607 struct zfcp_port *port; 608 609 shost = adapter->scsi_host; 610 if (!shost) 611 return; 612 read_lock_irq(&zfcp_data.config_lock); 613 list_for_each_entry(port, &adapter->port_list_head, list) 614 if (port->rport) 615 port->rport = NULL; 616 read_unlock_irq(&zfcp_data.config_lock); 617 fc_remove_host(shost); 618 scsi_remove_host(shost); 619 scsi_host_put(shost); 620 adapter->scsi_host = NULL; 621 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 622 623 return; 624 } 625 626 /* 627 * Support functions for FC transport class 628 */ 629 static struct fc_host_statistics* 630 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 631 { 632 struct fc_host_statistics *fc_stats; 633 634 if (!adapter->fc_stats) { 635 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 636 if (!fc_stats) 637 return NULL; 638 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ 639 } 640 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 641 return adapter->fc_stats; 642 } 643 644 static void 645 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 646 struct fsf_qtcb_bottom_port *data, 647 struct fsf_qtcb_bottom_port *old) 648 { 649 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - 650 old->seconds_since_last_reset; 651 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 652 fc_stats->tx_words = data->tx_words - old->tx_words; 653 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 654 fc_stats->rx_words = data->rx_words - old->rx_words; 655 fc_stats->lip_count = data->lip - old->lip; 656 fc_stats->nos_count = data->nos - old->nos; 657 fc_stats->error_frames = data->error_frames - old->error_frames; 658 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 659 fc_stats->link_failure_count = data->link_failure - old->link_failure; 660 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 661 fc_stats->loss_of_signal_count = data->loss_of_signal - 662 old->loss_of_signal; 663 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - 664 old->psp_error_counts; 665 fc_stats->invalid_tx_word_count = data->invalid_tx_words - 666 old->invalid_tx_words; 667 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 668 fc_stats->fcp_input_requests = data->input_requests - 669 old->input_requests; 670 fc_stats->fcp_output_requests = data->output_requests - 671 old->output_requests; 672 fc_stats->fcp_control_requests = data->control_requests - 673 old->control_requests; 674 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 675 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 676 } 677 678 static void 679 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 680 struct fsf_qtcb_bottom_port *data) 681 { 682 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 683 fc_stats->tx_frames = data->tx_frames; 684 fc_stats->tx_words = data->tx_words; 685 fc_stats->rx_frames = data->rx_frames; 686 fc_stats->rx_words = data->rx_words; 687 fc_stats->lip_count = data->lip; 688 fc_stats->nos_count = data->nos; 689 fc_stats->error_frames = data->error_frames; 690 fc_stats->dumped_frames = data->dumped_frames; 691 fc_stats->link_failure_count = data->link_failure; 692 fc_stats->loss_of_sync_count = data->loss_of_sync; 693 fc_stats->loss_of_signal_count = data->loss_of_signal; 694 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 695 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 696 fc_stats->invalid_crc_count = data->invalid_crcs; 697 fc_stats->fcp_input_requests = data->input_requests; 698 fc_stats->fcp_output_requests = data->output_requests; 699 fc_stats->fcp_control_requests = data->control_requests; 700 fc_stats->fcp_input_megabytes = data->input_mb; 701 fc_stats->fcp_output_megabytes = data->output_mb; 702 } 703 704 /** 705 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc 706 * 707 * assumption: scsi_transport_fc synchronizes calls of 708 * get_fc_host_stats and reset_fc_host_stats 709 * (XXX to be checked otherwise introduce locking) 710 */ 711 static struct fc_host_statistics * 712 zfcp_get_fc_host_stats(struct Scsi_Host *shost) 713 { 714 struct zfcp_adapter *adapter; 715 struct fc_host_statistics *fc_stats; 716 struct fsf_qtcb_bottom_port *data; 717 int ret; 718 719 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 720 fc_stats = zfcp_init_fc_host_stats(adapter); 721 if (!fc_stats) 722 return NULL; 723 724 data = kzalloc(sizeof(*data), GFP_KERNEL); 725 if (!data) 726 return NULL; 727 728 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 729 if (ret) { 730 kfree(data); 731 return NULL; /* XXX return zeroed fc_stats? */ 732 } 733 734 if (adapter->stats_reset && 735 ((jiffies/HZ - adapter->stats_reset) < 736 data->seconds_since_last_reset)) { 737 zfcp_adjust_fc_host_stats(fc_stats, data, 738 adapter->stats_reset_data); 739 } else 740 zfcp_set_fc_host_stats(fc_stats, data); 741 742 kfree(data); 743 return fc_stats; 744 } 745 746 static void 747 zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 748 { 749 struct zfcp_adapter *adapter; 750 struct fsf_qtcb_bottom_port *data, *old_data; 751 int ret; 752 753 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 754 data = kzalloc(sizeof(*data), GFP_KERNEL); 755 if (!data) 756 return; 757 758 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 759 if (ret == 0) { 760 adapter->stats_reset = jiffies/HZ; 761 old_data = adapter->stats_reset_data; 762 adapter->stats_reset_data = data; /* finally freed in 763 adater_dequeue */ 764 kfree(old_data); 765 } 766 } 767 768 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 769 { 770 rport->dev_loss_tmo = timeout; 771 } 772 773 struct fc_function_template zfcp_transport_functions = { 774 .show_starget_port_id = 1, 775 .show_starget_port_name = 1, 776 .show_starget_node_name = 1, 777 .show_rport_supported_classes = 1, 778 .show_rport_maxframe_size = 1, 779 .show_rport_dev_loss_tmo = 1, 780 .show_host_node_name = 1, 781 .show_host_port_name = 1, 782 .show_host_permanent_port_name = 1, 783 .show_host_supported_classes = 1, 784 .show_host_supported_speeds = 1, 785 .show_host_maxframe_size = 1, 786 .show_host_serial_number = 1, 787 .get_fc_host_stats = zfcp_get_fc_host_stats, 788 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 789 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 790 /* no functions registered for following dynamic attributes but 791 directly set by LLDD */ 792 .show_host_port_type = 1, 793 .show_host_speed = 1, 794 .show_host_port_id = 1, 795 }; 796 797 /** 798 * ZFCP_DEFINE_SCSI_ATTR 799 * @_name: name of show attribute 800 * @_format: format string 801 * @_value: value to print 802 * 803 * Generates attribute for a unit. 804 */ 805 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ 806 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ 807 char *buf) \ 808 { \ 809 struct scsi_device *sdev; \ 810 struct zfcp_unit *unit; \ 811 \ 812 sdev = to_scsi_device(dev); \ 813 unit = sdev->hostdata; \ 814 return sprintf(buf, _format, _value); \ 815 } \ 816 \ 817 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); 818 819 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); 820 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); 821 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); 822 823 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { 824 &dev_attr_fcp_lun, 825 &dev_attr_wwpn, 826 &dev_attr_hba_id, 827 NULL 828 }; 829 830 #undef ZFCP_LOG_AREA 831