zfcp_scsi.c revision ba1724202aafed4bbc4a239ac6fb433f454fddea
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#include <asm/atomic.h> 26 27static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); 28static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); 29static int zfcp_scsi_slave_configure(struct scsi_device *sdp); 30static int zfcp_scsi_queuecommand(struct scsi_cmnd *, 31 void (*done) (struct scsi_cmnd *)); 32static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); 33static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); 34static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); 35static int zfcp_task_management_function(struct zfcp_unit *, u8, 36 struct scsi_cmnd *); 37 38static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, 39 unsigned int, unsigned int); 40 41static struct device_attribute *zfcp_sysfs_sdev_attrs[]; 42 43struct zfcp_data zfcp_data = { 44 .scsi_host_template = { 45 .name = ZFCP_NAME, 46 .module = THIS_MODULE, 47 .proc_name = "zfcp", 48 .slave_alloc = zfcp_scsi_slave_alloc, 49 .slave_configure = zfcp_scsi_slave_configure, 50 .slave_destroy = zfcp_scsi_slave_destroy, 51 .queuecommand = zfcp_scsi_queuecommand, 52 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 53 .eh_device_reset_handler = zfcp_scsi_eh_device_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*/ 67char * 68zfcp_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*/ 79char * 80zfcp_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 93static fcp_dl_t * 94zfcp_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 110fcp_dl_t 111zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) 112{ 113 return *zfcp_get_fcp_dl_ptr(fcp_cmd); 114} 115 116void 117zfcp_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 */ 126static inline void 127set_byte(int *result, char status, char pos) 128{ 129 *result |= status << (pos * 8); 130} 131 132void 133set_host_byte(int *result, char status) 134{ 135 set_byte(result, status, 2); 136} 137 138void 139set_driver_byte(int *result, char status) 140{ 141 set_byte(result, status, 3); 142} 143 144static int 145zfcp_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 */ 177static 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 zfcp_erp_wait(unit->port->adapter); 183 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); 184 sdpnt->hostdata = NULL; 185 unit->device = NULL; 186 zfcp_erp_unit_failed(unit); 187 zfcp_unit_put(unit); 188 } else 189 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " 190 "address %p\n", sdpnt); 191} 192 193/* 194 * called from scsi midlayer to allow finetuning of a device. 195 */ 196static int 197zfcp_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 */ 211static void 212zfcp_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 */ 233int 234zfcp_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 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer, 262 ZFCP_REQ_AUTO_CLEANUP); 263 if (unlikely(tmp == -EBUSY)) { 264 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " 265 "on port 0x%016Lx in recovery\n", 266 zfcp_get_busid_by_unit(unit), 267 unit->fcp_lun, unit->port->wwpn); 268 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 269 goto out; 270 } 271 272 if (unlikely(tmp < 0)) { 273 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); 274 retval = SCSI_MLQUEUE_HOST_BUSY; 275 } 276 277out: 278 return retval; 279} 280 281static void 282zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) 283{ 284 struct completion *wait = (struct completion *) scpnt->SCp.ptr; 285 complete(wait); 286} 287 288 289/** 290 * zfcp_scsi_command_sync - send a SCSI command and wait for completion 291 * @unit: unit where command is sent to 292 * @scpnt: scsi command to be sent 293 * @use_timer: indicates whether timer should be setup or not 294 * Return: 0 295 * 296 * Errors are indicated in scpnt->result 297 */ 298int 299zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, 300 int use_timer) 301{ 302 int ret; 303 DECLARE_COMPLETION_ONSTACK(wait); 304 305 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ 306 scpnt->scsi_done = zfcp_scsi_command_sync_handler; 307 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, 308 use_timer); 309 if (ret == 0) 310 wait_for_completion(&wait); 311 312 scpnt->SCp.ptr = NULL; 313 314 return 0; 315} 316 317/* 318 * function: zfcp_scsi_queuecommand 319 * 320 * purpose: enqueues a SCSI command to the specified target device 321 * 322 * returns: 0 - success, SCSI command enqueued 323 * !0 - failure 324 */ 325static int 326zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, 327 void (*done) (struct scsi_cmnd *)) 328{ 329 struct zfcp_unit *unit; 330 struct zfcp_adapter *adapter; 331 332 /* reset the status for this request */ 333 scpnt->result = 0; 334 scpnt->host_scribble = NULL; 335 scpnt->scsi_done = done; 336 337 /* 338 * figure out adapter and target device 339 * (stored there by zfcp_scsi_slave_alloc) 340 */ 341 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; 342 unit = (struct zfcp_unit *) scpnt->device->hostdata; 343 344 return zfcp_scsi_command_async(adapter, unit, scpnt, 0); 345} 346 347static struct zfcp_unit * 348zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, 349 unsigned int lun) 350{ 351 struct zfcp_port *port; 352 struct zfcp_unit *unit, *retval = NULL; 353 354 list_for_each_entry(port, &adapter->port_list_head, list) { 355 if (!port->rport || (id != port->rport->scsi_target_id)) 356 continue; 357 list_for_each_entry(unit, &port->unit_list_head, list) 358 if (lun == unit->scsi_lun) { 359 retval = unit; 360 goto out; 361 } 362 } 363 out: 364 return retval; 365} 366 367/** 368 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command 369 * @scpnt: pointer to scsi_cmnd to be aborted 370 * Return: SUCCESS - command has been aborted and cleaned up in internal 371 * bookkeeping, SCSI stack won't be called for aborted command 372 * FAILED - otherwise 373 * 374 * We do not need to care for a SCSI command which completes normally 375 * but late during this abort routine runs. We are allowed to return 376 * late commands to the SCSI stack. It tracks the state of commands and 377 * will handle late commands. (Usually, the normal completion of late 378 * commands is ignored with respect to the running abort operation.) 379 */ 380static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 381{ 382 struct Scsi_Host *scsi_host; 383 struct zfcp_adapter *adapter; 384 struct zfcp_unit *unit; 385 struct zfcp_fsf_req *fsf_req; 386 unsigned long flags; 387 unsigned long old_req_id; 388 int retval = SUCCESS; 389 390 scsi_host = scpnt->device->host; 391 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; 392 unit = (struct zfcp_unit *) scpnt->device->hostdata; 393 394 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", 395 scpnt, zfcp_get_busid_by_adapter(adapter)); 396 397 /* avoid race condition between late normal completion and abort */ 398 write_lock_irqsave(&adapter->abort_lock, flags); 399 400 /* Check whether corresponding fsf_req is still pending */ 401 spin_lock(&adapter->req_list_lock); 402 fsf_req = zfcp_reqlist_find(adapter, 403 (unsigned long) scpnt->host_scribble); 404 spin_unlock(&adapter->req_list_lock); 405 if (!fsf_req) { 406 write_unlock_irqrestore(&adapter->abort_lock, flags); 407 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0); 408 retval = SUCCESS; 409 goto out; 410 } 411 fsf_req->data = 0; 412 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; 413 old_req_id = fsf_req->req_id; 414 415 /* don't access old fsf_req after releasing the abort_lock */ 416 write_unlock_irqrestore(&adapter->abort_lock, flags); 417 418 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0); 419 if (!fsf_req) { 420 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); 421 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, 422 old_req_id); 423 retval = FAILED; 424 goto out; 425 } 426 427 __wait_event(fsf_req->completion_wq, 428 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 429 430 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { 431 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0); 432 retval = SUCCESS; 433 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { 434 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0); 435 retval = SUCCESS; 436 } else { 437 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0); 438 retval = FAILED; 439 } 440 zfcp_fsf_req_free(fsf_req); 441 out: 442 return retval; 443} 444 445static int 446zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 447{ 448 int retval; 449 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; 450 451 if (!unit) { 452 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); 453 retval = SUCCESS; 454 goto out; 455 } 456 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx on port 0x%016Lx, adapter %s\n", 457 unit->fcp_lun, unit->port->wwpn, 458 zfcp_get_busid_by_adapter(unit->port->adapter)); 459 460 /* 461 * If we do not know whether the unit supports 'logical unit reset' 462 * then try 'logical unit reset' and proceed with 'target reset' 463 * if 'logical unit reset' fails. 464 * If the unit is known not to support 'logical unit reset' then 465 * skip 'logical unit reset' and try 'target reset' immediately. 466 */ 467 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 468 &unit->status)) { 469 retval = zfcp_task_management_function(unit, 470 FCP_LOGICAL_UNIT_RESET, 471 scpnt); 472 if (retval) { 473 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); 474 if (retval == -ENOTSUPP) 475 atomic_set_mask 476 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 477 &unit->status); 478 /* fall through and try 'target reset' next */ 479 } else { 480 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", 481 unit); 482 /* avoid 'target reset' */ 483 retval = SUCCESS; 484 goto out; 485 } 486 } 487 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); 488 if (retval) { 489 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); 490 retval = FAILED; 491 } else { 492 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); 493 retval = SUCCESS; 494 } 495 out: 496 return retval; 497} 498 499static int 500zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, 501 struct scsi_cmnd *scpnt) 502{ 503 struct zfcp_adapter *adapter = unit->port->adapter; 504 struct zfcp_fsf_req *fsf_req; 505 int retval = 0; 506 507 /* issue task management function */ 508 fsf_req = zfcp_fsf_send_fcp_command_task_management 509 (adapter, unit, tm_flags, 0); 510 if (!fsf_req) { 511 ZFCP_LOG_INFO("error: creation of task management request " 512 "failed for unit 0x%016Lx on port 0x%016Lx on " 513 "adapter %s\n", unit->fcp_lun, unit->port->wwpn, 514 zfcp_get_busid_by_adapter(adapter)); 515 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); 516 retval = -ENOMEM; 517 goto out; 518 } 519 520 __wait_event(fsf_req->completion_wq, 521 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 522 523 /* 524 * check completion status of task management function 525 */ 526 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 527 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); 528 retval = -EIO; 529 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { 530 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); 531 retval = -ENOTSUPP; 532 } else 533 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); 534 535 zfcp_fsf_req_free(fsf_req); 536 out: 537 return retval; 538} 539 540/** 541 * zfcp_scsi_eh_host_reset_handler - handler for host reset 542 */ 543static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 544{ 545 struct zfcp_unit *unit; 546 struct zfcp_adapter *adapter; 547 548 unit = (struct zfcp_unit*) scpnt->device->hostdata; 549 adapter = unit->port->adapter; 550 551 ZFCP_LOG_NORMAL("host reset because of problems with " 552 "unit 0x%016Lx on port 0x%016Lx, adapter %s\n", 553 unit->fcp_lun, unit->port->wwpn, 554 zfcp_get_busid_by_adapter(unit->port->adapter)); 555 556 zfcp_erp_adapter_reopen(adapter, 0); 557 zfcp_erp_wait(adapter); 558 559 return SUCCESS; 560} 561 562int 563zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) 564{ 565 int retval = 0; 566 static unsigned int unique_id = 0; 567 568 if (adapter->scsi_host) 569 goto out; 570 571 /* register adapter as SCSI host with mid layer of SCSI stack */ 572 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, 573 sizeof (struct zfcp_adapter *)); 574 if (!adapter->scsi_host) { 575 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " 576 "for adapter %s ", 577 zfcp_get_busid_by_adapter(adapter)); 578 retval = -EIO; 579 goto out; 580 } 581 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); 582 583 /* tell the SCSI stack some characteristics of this adapter */ 584 adapter->scsi_host->max_id = 1; 585 adapter->scsi_host->max_lun = 1; 586 adapter->scsi_host->max_channel = 0; 587 adapter->scsi_host->unique_id = unique_id++; /* FIXME */ 588 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; 589 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; 590 591 /* 592 * save a pointer to our own adapter data structure within 593 * hostdata field of SCSI host data structure 594 */ 595 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 596 597 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 598 scsi_host_put(adapter->scsi_host); 599 retval = -EIO; 600 goto out; 601 } 602 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 603 out: 604 return retval; 605} 606 607void 608zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) 609{ 610 struct Scsi_Host *shost; 611 struct zfcp_port *port; 612 613 shost = adapter->scsi_host; 614 if (!shost) 615 return; 616 read_lock_irq(&zfcp_data.config_lock); 617 list_for_each_entry(port, &adapter->port_list_head, list) 618 if (port->rport) 619 port->rport = NULL; 620 read_unlock_irq(&zfcp_data.config_lock); 621 fc_remove_host(shost); 622 scsi_remove_host(shost); 623 scsi_host_put(shost); 624 adapter->scsi_host = NULL; 625 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 626 627 return; 628} 629 630/* 631 * Support functions for FC transport class 632 */ 633static struct fc_host_statistics* 634zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 635{ 636 struct fc_host_statistics *fc_stats; 637 638 if (!adapter->fc_stats) { 639 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 640 if (!fc_stats) 641 return NULL; 642 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ 643 } 644 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 645 return adapter->fc_stats; 646} 647 648static void 649zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 650 struct fsf_qtcb_bottom_port *data, 651 struct fsf_qtcb_bottom_port *old) 652{ 653 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - 654 old->seconds_since_last_reset; 655 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 656 fc_stats->tx_words = data->tx_words - old->tx_words; 657 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 658 fc_stats->rx_words = data->rx_words - old->rx_words; 659 fc_stats->lip_count = data->lip - old->lip; 660 fc_stats->nos_count = data->nos - old->nos; 661 fc_stats->error_frames = data->error_frames - old->error_frames; 662 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 663 fc_stats->link_failure_count = data->link_failure - old->link_failure; 664 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 665 fc_stats->loss_of_signal_count = data->loss_of_signal - 666 old->loss_of_signal; 667 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - 668 old->psp_error_counts; 669 fc_stats->invalid_tx_word_count = data->invalid_tx_words - 670 old->invalid_tx_words; 671 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 672 fc_stats->fcp_input_requests = data->input_requests - 673 old->input_requests; 674 fc_stats->fcp_output_requests = data->output_requests - 675 old->output_requests; 676 fc_stats->fcp_control_requests = data->control_requests - 677 old->control_requests; 678 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 679 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 680} 681 682static void 683zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 684 struct fsf_qtcb_bottom_port *data) 685{ 686 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 687 fc_stats->tx_frames = data->tx_frames; 688 fc_stats->tx_words = data->tx_words; 689 fc_stats->rx_frames = data->rx_frames; 690 fc_stats->rx_words = data->rx_words; 691 fc_stats->lip_count = data->lip; 692 fc_stats->nos_count = data->nos; 693 fc_stats->error_frames = data->error_frames; 694 fc_stats->dumped_frames = data->dumped_frames; 695 fc_stats->link_failure_count = data->link_failure; 696 fc_stats->loss_of_sync_count = data->loss_of_sync; 697 fc_stats->loss_of_signal_count = data->loss_of_signal; 698 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 699 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 700 fc_stats->invalid_crc_count = data->invalid_crcs; 701 fc_stats->fcp_input_requests = data->input_requests; 702 fc_stats->fcp_output_requests = data->output_requests; 703 fc_stats->fcp_control_requests = data->control_requests; 704 fc_stats->fcp_input_megabytes = data->input_mb; 705 fc_stats->fcp_output_megabytes = data->output_mb; 706} 707 708/** 709 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc 710 * 711 * assumption: scsi_transport_fc synchronizes calls of 712 * get_fc_host_stats and reset_fc_host_stats 713 * (XXX to be checked otherwise introduce locking) 714 */ 715static struct fc_host_statistics * 716zfcp_get_fc_host_stats(struct Scsi_Host *shost) 717{ 718 struct zfcp_adapter *adapter; 719 struct fc_host_statistics *fc_stats; 720 struct fsf_qtcb_bottom_port *data; 721 int ret; 722 723 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 724 fc_stats = zfcp_init_fc_host_stats(adapter); 725 if (!fc_stats) 726 return NULL; 727 728 data = kzalloc(sizeof(*data), GFP_KERNEL); 729 if (!data) 730 return NULL; 731 732 ret = zfcp_fsf_exchange_port_data_sync(adapter, data); 733 if (ret) { 734 kfree(data); 735 return NULL; /* XXX return zeroed fc_stats? */ 736 } 737 738 if (adapter->stats_reset && 739 ((jiffies/HZ - adapter->stats_reset) < 740 data->seconds_since_last_reset)) { 741 zfcp_adjust_fc_host_stats(fc_stats, data, 742 adapter->stats_reset_data); 743 } else 744 zfcp_set_fc_host_stats(fc_stats, data); 745 746 kfree(data); 747 return fc_stats; 748} 749 750static void 751zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 752{ 753 struct zfcp_adapter *adapter; 754 struct fsf_qtcb_bottom_port *data, *old_data; 755 int ret; 756 757 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 758 data = kzalloc(sizeof(*data), GFP_KERNEL); 759 if (!data) 760 return; 761 762 ret = zfcp_fsf_exchange_port_data_sync(adapter, data); 763 if (ret) { 764 kfree(data); 765 } else { 766 adapter->stats_reset = jiffies/HZ; 767 old_data = adapter->stats_reset_data; 768 adapter->stats_reset_data = data; /* finally freed in 769 adater_dequeue */ 770 kfree(old_data); 771 } 772} 773 774static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 775{ 776 rport->dev_loss_tmo = timeout; 777} 778 779struct fc_function_template zfcp_transport_functions = { 780 .show_starget_port_id = 1, 781 .show_starget_port_name = 1, 782 .show_starget_node_name = 1, 783 .show_rport_supported_classes = 1, 784 .show_rport_maxframe_size = 1, 785 .show_rport_dev_loss_tmo = 1, 786 .show_host_node_name = 1, 787 .show_host_port_name = 1, 788 .show_host_permanent_port_name = 1, 789 .show_host_supported_classes = 1, 790 .show_host_supported_speeds = 1, 791 .show_host_maxframe_size = 1, 792 .show_host_serial_number = 1, 793 .get_fc_host_stats = zfcp_get_fc_host_stats, 794 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 795 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 796 /* no functions registered for following dynamic attributes but 797 directly set by LLDD */ 798 .show_host_port_type = 1, 799 .show_host_speed = 1, 800 .show_host_port_id = 1, 801 .disable_target_scan = 1, 802}; 803 804/** 805 * ZFCP_DEFINE_SCSI_ATTR 806 * @_name: name of show attribute 807 * @_format: format string 808 * @_value: value to print 809 * 810 * Generates attribute for a unit. 811 */ 812#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ 813static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ 814 char *buf) \ 815{ \ 816 struct scsi_device *sdev; \ 817 struct zfcp_unit *unit; \ 818 \ 819 sdev = to_scsi_device(dev); \ 820 unit = sdev->hostdata; \ 821 return sprintf(buf, _format, _value); \ 822} \ 823 \ 824static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); 825 826ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); 827ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); 828ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); 829 830static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { 831 &dev_attr_fcp_lun, 832 &dev_attr_wwpn, 833 &dev_attr_hba_id, 834 NULL 835}; 836 837#undef ZFCP_LOG_AREA 838