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 27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); 28 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); 29 static int zfcp_scsi_slave_configure(struct scsi_device *sdp); 30 static int zfcp_scsi_queuecommand(struct scsi_cmnd *, 31 void (*done) (struct scsi_cmnd *)); 32 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); 33 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); 34 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); 35 static int zfcp_task_management_function(struct zfcp_unit *, u8, 36 struct scsi_cmnd *); 37 38 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, 39 unsigned int, unsigned int); 40 41 static struct device_attribute *zfcp_sysfs_sdev_attrs[]; 42 43 struct 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_bus_reset_handler = zfcp_scsi_eh_host_reset_handler, 55 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 56 .can_queue = 4096, 57 .this_id = -1, 58 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, 59 .cmd_per_lun = 1, 60 .use_clustering = 1, 61 .sdev_attrs = zfcp_sysfs_sdev_attrs, 62 .max_sectors = ZFCP_MAX_SECTORS, 63 }, 64 .driver_version = ZFCP_VERSION, 65 }; 66 67 /* Find start of Response Information in FCP response unit*/ 68 char * 69 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 70 { 71 char *fcp_rsp_info_ptr; 72 73 fcp_rsp_info_ptr = 74 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 75 76 return fcp_rsp_info_ptr; 77 } 78 79 /* Find start of Sense Information in FCP response unit*/ 80 char * 81 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 82 { 83 char *fcp_sns_info_ptr; 84 85 fcp_sns_info_ptr = 86 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 87 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) 88 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + 89 fcp_rsp_iu->fcp_rsp_len; 90 91 return fcp_sns_info_ptr; 92 } 93 94 static fcp_dl_t * 95 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) 96 { 97 int additional_length = fcp_cmd->add_fcp_cdb_length << 2; 98 fcp_dl_t *fcp_dl_addr; 99 100 fcp_dl_addr = (fcp_dl_t *) 101 ((unsigned char *) fcp_cmd + 102 sizeof (struct fcp_cmnd_iu) + additional_length); 103 /* 104 * fcp_dl_addr = start address of fcp_cmnd structure + 105 * size of fixed part + size of dynamically sized add_dcp_cdb field 106 * SEE FCP-2 documentation 107 */ 108 return fcp_dl_addr; 109 } 110 111 fcp_dl_t 112 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) 113 { 114 return *zfcp_get_fcp_dl_ptr(fcp_cmd); 115 } 116 117 void 118 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) 119 { 120 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; 121 } 122 123 /* 124 * note: it's a bit-or operation not an assignment 125 * regarding the specified byte 126 */ 127 static inline void 128 set_byte(int *result, char status, char pos) 129 { 130 *result |= status << (pos * 8); 131 } 132 133 void 134 set_host_byte(int *result, char status) 135 { 136 set_byte(result, status, 2); 137 } 138 139 void 140 set_driver_byte(int *result, char status) 141 { 142 set_byte(result, status, 3); 143 } 144 145 static int 146 zfcp_scsi_slave_alloc(struct scsi_device *sdp) 147 { 148 struct zfcp_adapter *adapter; 149 struct zfcp_unit *unit; 150 unsigned long flags; 151 int retval = -ENXIO; 152 153 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; 154 if (!adapter) 155 goto out; 156 157 read_lock_irqsave(&zfcp_data.config_lock, flags); 158 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); 159 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, 160 &unit->status)) { 161 sdp->hostdata = unit; 162 unit->device = sdp; 163 zfcp_unit_get(unit); 164 retval = 0; 165 } 166 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 167 out: 168 return retval; 169 } 170 171 /** 172 * zfcp_scsi_slave_destroy - called when scsi device is removed 173 * 174 * Remove reference to associated scsi device for an zfcp_unit. 175 * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs 176 * or a scan for this device might have failed. 177 */ 178 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) 179 { 180 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; 181 182 if (unit) { 183 zfcp_erp_wait(unit->port->adapter); 184 wait_event(unit->scsi_scan_wq, 185 atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, 186 &unit->status) == 0); 187 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); 188 sdpnt->hostdata = NULL; 189 unit->device = NULL; 190 zfcp_erp_unit_failed(unit); 191 zfcp_unit_put(unit); 192 } else { 193 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " 194 "address %p\n", sdpnt); 195 } 196 } 197 198 /* 199 * called from scsi midlayer to allow finetuning of a device. 200 */ 201 static int 202 zfcp_scsi_slave_configure(struct scsi_device *sdp) 203 { 204 if (sdp->tagged_supported) 205 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); 206 else 207 scsi_adjust_queue_depth(sdp, 0, 1); 208 return 0; 209 } 210 211 /** 212 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function 213 * @scpnt: pointer to struct scsi_cmnd where result is set 214 * @result: result to be set in scpnt (e.g. DID_ERROR) 215 */ 216 static void 217 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 218 { 219 set_host_byte(&scpnt->result, result); 220 if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) 221 zfcp_scsi_dbf_event_result("fail", 4, 222 (struct zfcp_adapter*) scpnt->device->host->hostdata[0], 223 scpnt, NULL); 224 /* return directly */ 225 scpnt->scsi_done(scpnt); 226 } 227 228 /** 229 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and 230 * zfcp_scsi_command_sync 231 * @adapter: adapter where scsi command is issued 232 * @unit: unit to which scsi command is sent 233 * @scpnt: scsi command to be sent 234 * @timer: timer to be started if request is successfully initiated 235 * 236 * Note: In scsi_done function must be set in scpnt. 237 */ 238 int 239 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, 240 struct scsi_cmnd *scpnt, int use_timer) 241 { 242 int tmp; 243 int retval; 244 245 retval = 0; 246 247 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); 248 BUG_ON(scpnt->scsi_done == NULL); 249 250 if (unlikely(NULL == unit)) { 251 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 252 goto out; 253 } 254 255 if (unlikely( 256 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || 257 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { 258 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " 259 "0x%016Lx on adapter %s\n", 260 unit->fcp_lun, unit->port->wwpn, 261 zfcp_get_busid_by_adapter(adapter)); 262 zfcp_scsi_command_fail(scpnt, DID_ERROR); 263 goto out; 264 } 265 266 if (unlikely( 267 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { 268 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " 269 "on port 0x%016Lx in recovery\n", 270 zfcp_get_busid_by_unit(unit), 271 unit->fcp_lun, unit->port->wwpn); 272 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 273 goto out; 274 } 275 276 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer, 277 ZFCP_REQ_AUTO_CLEANUP); 278 279 if (unlikely(tmp < 0)) { 280 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); 281 retval = SCSI_MLQUEUE_HOST_BUSY; 282 } 283 284 out: 285 return retval; 286 } 287 288 static void 289 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) 290 { 291 struct completion *wait = (struct completion *) scpnt->SCp.ptr; 292 complete(wait); 293 } 294 295 296 /** 297 * zfcp_scsi_command_sync - send a SCSI command and wait for completion 298 * @unit: unit where command is sent to 299 * @scpnt: scsi command to be sent 300 * @use_timer: indicates whether timer should be setup or not 301 * Return: 0 302 * 303 * Errors are indicated in scpnt->result 304 */ 305 int 306 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, 307 int use_timer) 308 { 309 int ret; 310 DECLARE_COMPLETION_ONSTACK(wait); 311 312 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ 313 scpnt->scsi_done = zfcp_scsi_command_sync_handler; 314 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, 315 use_timer); 316 if (ret == 0) 317 wait_for_completion(&wait); 318 319 scpnt->SCp.ptr = NULL; 320 321 return 0; 322 } 323 324 /* 325 * function: zfcp_scsi_queuecommand 326 * 327 * purpose: enqueues a SCSI command to the specified target device 328 * 329 * returns: 0 - success, SCSI command enqueued 330 * !0 - failure 331 */ 332 static int 333 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, 334 void (*done) (struct scsi_cmnd *)) 335 { 336 struct zfcp_unit *unit; 337 struct zfcp_adapter *adapter; 338 339 /* reset the status for this request */ 340 scpnt->result = 0; 341 scpnt->host_scribble = NULL; 342 scpnt->scsi_done = done; 343 344 /* 345 * figure out adapter and target device 346 * (stored there by zfcp_scsi_slave_alloc) 347 */ 348 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; 349 unit = (struct zfcp_unit *) scpnt->device->hostdata; 350 351 return zfcp_scsi_command_async(adapter, unit, scpnt, 0); 352 } 353 354 static struct zfcp_unit * 355 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, 356 unsigned int lun) 357 { 358 struct zfcp_port *port; 359 struct zfcp_unit *unit, *retval = NULL; 360 361 list_for_each_entry(port, &adapter->port_list_head, list) { 362 if (!port->rport || (id != port->rport->scsi_target_id)) 363 continue; 364 list_for_each_entry(unit, &port->unit_list_head, list) { 365 if (lun == unit->scsi_lun) { 366 retval = unit; 367 goto out; 368 } 369 } 370 } 371 out: 372 return retval; 373 } 374 375 /** 376 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command 377 * @scpnt: pointer to scsi_cmnd to be aborted 378 * Return: SUCCESS - command has been aborted and cleaned up in internal 379 * bookkeeping, SCSI stack won't be called for aborted command 380 * FAILED - otherwise 381 * 382 * We do not need to care for a SCSI command which completes normally 383 * but late during this abort routine runs. We are allowed to return 384 * late commands to the SCSI stack. It tracks the state of commands and 385 * will handle late commands. (Usually, the normal completion of late 386 * commands is ignored with respect to the running abort operation.) 387 */ 388 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 389 { 390 struct Scsi_Host *scsi_host; 391 struct zfcp_adapter *adapter; 392 struct zfcp_unit *unit; 393 struct zfcp_fsf_req *fsf_req; 394 unsigned long flags; 395 unsigned long old_req_id; 396 int retval = SUCCESS; 397 398 scsi_host = scpnt->device->host; 399 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; 400 unit = (struct zfcp_unit *) scpnt->device->hostdata; 401 402 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", 403 scpnt, zfcp_get_busid_by_adapter(adapter)); 404 405 /* avoid race condition between late normal completion and abort */ 406 write_lock_irqsave(&adapter->abort_lock, flags); 407 408 /* Check whether corresponding fsf_req is still pending */ 409 spin_lock(&adapter->req_list_lock); 410 fsf_req = zfcp_reqlist_find(adapter, 411 (unsigned long) scpnt->host_scribble); 412 spin_unlock(&adapter->req_list_lock); 413 if (!fsf_req) { 414 write_unlock_irqrestore(&adapter->abort_lock, flags); 415 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0); 416 retval = SUCCESS; 417 goto out; 418 } 419 fsf_req->data = 0; 420 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; 421 old_req_id = fsf_req->req_id; 422 423 /* don't access old fsf_req after releasing the abort_lock */ 424 write_unlock_irqrestore(&adapter->abort_lock, flags); 425 426 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0); 427 if (!fsf_req) { 428 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); 429 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, 430 old_req_id); 431 retval = FAILED; 432 goto out; 433 } 434 435 __wait_event(fsf_req->completion_wq, 436 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 437 438 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { 439 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0); 440 retval = SUCCESS; 441 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { 442 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0); 443 retval = SUCCESS; 444 } else { 445 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0); 446 retval = FAILED; 447 } 448 zfcp_fsf_req_free(fsf_req); 449 out: 450 return retval; 451 } 452 453 static int 454 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 455 { 456 int retval; 457 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; 458 459 if (!unit) { 460 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); 461 retval = SUCCESS; 462 goto out; 463 } 464 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); 465 466 /* 467 * If we do not know whether the unit supports 'logical unit reset' 468 * then try 'logical unit reset' and proceed with 'target reset' 469 * if 'logical unit reset' fails. 470 * If the unit is known not to support 'logical unit reset' then 471 * skip 'logical unit reset' and try 'target reset' immediately. 472 */ 473 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 474 &unit->status)) { 475 retval = zfcp_task_management_function(unit, 476 FCP_LOGICAL_UNIT_RESET, 477 scpnt); 478 if (retval) { 479 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); 480 if (retval == -ENOTSUPP) 481 atomic_set_mask 482 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 483 &unit->status); 484 /* fall through and try 'target reset' next */ 485 } else { 486 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", 487 unit); 488 /* avoid 'target reset' */ 489 retval = SUCCESS; 490 goto out; 491 } 492 } 493 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); 494 if (retval) { 495 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); 496 retval = FAILED; 497 } else { 498 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); 499 retval = SUCCESS; 500 } 501 out: 502 return retval; 503 } 504 505 static int 506 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, 507 struct scsi_cmnd *scpnt) 508 { 509 struct zfcp_adapter *adapter = unit->port->adapter; 510 struct zfcp_fsf_req *fsf_req; 511 int retval = 0; 512 513 /* issue task management function */ 514 fsf_req = zfcp_fsf_send_fcp_command_task_management 515 (adapter, unit, tm_flags, 0); 516 if (!fsf_req) { 517 ZFCP_LOG_INFO("error: creation of task management request " 518 "failed for unit 0x%016Lx on port 0x%016Lx on " 519 "adapter %s\n", unit->fcp_lun, unit->port->wwpn, 520 zfcp_get_busid_by_adapter(adapter)); 521 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); 522 retval = -ENOMEM; 523 goto out; 524 } 525 526 __wait_event(fsf_req->completion_wq, 527 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 528 529 /* 530 * check completion status of task management function 531 */ 532 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 533 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); 534 retval = -EIO; 535 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { 536 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); 537 retval = -ENOTSUPP; 538 } else 539 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); 540 541 zfcp_fsf_req_free(fsf_req); 542 out: 543 return retval; 544 } 545 546 /** 547 * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset 548 */ 549 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 550 { 551 struct zfcp_unit *unit; 552 struct zfcp_adapter *adapter; 553 554 unit = (struct zfcp_unit*) scpnt->device->hostdata; 555 adapter = unit->port->adapter; 556 557 ZFCP_LOG_NORMAL("host/bus reset because of problems with " 558 "unit 0x%016Lx\n", unit->fcp_lun); 559 560 zfcp_erp_adapter_reopen(adapter, 0); 561 zfcp_erp_wait(adapter); 562 563 return SUCCESS; 564 } 565 566 int 567 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) 568 { 569 int retval = 0; 570 static unsigned int unique_id = 0; 571 572 if (adapter->scsi_host) 573 goto out; 574 575 /* register adapter as SCSI host with mid layer of SCSI stack */ 576 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, 577 sizeof (struct zfcp_adapter *)); 578 if (!adapter->scsi_host) { 579 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " 580 "for adapter %s ", 581 zfcp_get_busid_by_adapter(adapter)); 582 retval = -EIO; 583 goto out; 584 } 585 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); 586 587 /* tell the SCSI stack some characteristics of this adapter */ 588 adapter->scsi_host->max_id = 1; 589 adapter->scsi_host->max_lun = 1; 590 adapter->scsi_host->max_channel = 0; 591 adapter->scsi_host->unique_id = unique_id++; /* FIXME */ 592 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; 593 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; 594 595 /* 596 * save a pointer to our own adapter data structure within 597 * hostdata field of SCSI host data structure 598 */ 599 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 600 601 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 602 scsi_host_put(adapter->scsi_host); 603 retval = -EIO; 604 goto out; 605 } 606 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 607 out: 608 return retval; 609 } 610 611 void 612 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) 613 { 614 struct Scsi_Host *shost; 615 struct zfcp_port *port; 616 617 shost = adapter->scsi_host; 618 if (!shost) 619 return; 620 read_lock_irq(&zfcp_data.config_lock); 621 list_for_each_entry(port, &adapter->port_list_head, list) 622 if (port->rport) 623 port->rport = NULL; 624 read_unlock_irq(&zfcp_data.config_lock); 625 fc_remove_host(shost); 626 scsi_remove_host(shost); 627 scsi_host_put(shost); 628 adapter->scsi_host = NULL; 629 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 630 631 return; 632 } 633 634 /* 635 * Support functions for FC transport class 636 */ 637 static struct fc_host_statistics* 638 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 639 { 640 struct fc_host_statistics *fc_stats; 641 642 if (!adapter->fc_stats) { 643 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 644 if (!fc_stats) 645 return NULL; 646 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ 647 } 648 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 649 return adapter->fc_stats; 650 } 651 652 static void 653 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 654 struct fsf_qtcb_bottom_port *data, 655 struct fsf_qtcb_bottom_port *old) 656 { 657 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - 658 old->seconds_since_last_reset; 659 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 660 fc_stats->tx_words = data->tx_words - old->tx_words; 661 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 662 fc_stats->rx_words = data->rx_words - old->rx_words; 663 fc_stats->lip_count = data->lip - old->lip; 664 fc_stats->nos_count = data->nos - old->nos; 665 fc_stats->error_frames = data->error_frames - old->error_frames; 666 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 667 fc_stats->link_failure_count = data->link_failure - old->link_failure; 668 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 669 fc_stats->loss_of_signal_count = data->loss_of_signal - 670 old->loss_of_signal; 671 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - 672 old->psp_error_counts; 673 fc_stats->invalid_tx_word_count = data->invalid_tx_words - 674 old->invalid_tx_words; 675 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 676 fc_stats->fcp_input_requests = data->input_requests - 677 old->input_requests; 678 fc_stats->fcp_output_requests = data->output_requests - 679 old->output_requests; 680 fc_stats->fcp_control_requests = data->control_requests - 681 old->control_requests; 682 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 683 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 684 } 685 686 static void 687 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 688 struct fsf_qtcb_bottom_port *data) 689 { 690 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 691 fc_stats->tx_frames = data->tx_frames; 692 fc_stats->tx_words = data->tx_words; 693 fc_stats->rx_frames = data->rx_frames; 694 fc_stats->rx_words = data->rx_words; 695 fc_stats->lip_count = data->lip; 696 fc_stats->nos_count = data->nos; 697 fc_stats->error_frames = data->error_frames; 698 fc_stats->dumped_frames = data->dumped_frames; 699 fc_stats->link_failure_count = data->link_failure; 700 fc_stats->loss_of_sync_count = data->loss_of_sync; 701 fc_stats->loss_of_signal_count = data->loss_of_signal; 702 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 703 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 704 fc_stats->invalid_crc_count = data->invalid_crcs; 705 fc_stats->fcp_input_requests = data->input_requests; 706 fc_stats->fcp_output_requests = data->output_requests; 707 fc_stats->fcp_control_requests = data->control_requests; 708 fc_stats->fcp_input_megabytes = data->input_mb; 709 fc_stats->fcp_output_megabytes = data->output_mb; 710 } 711 712 /** 713 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc 714 * 715 * assumption: scsi_transport_fc synchronizes calls of 716 * get_fc_host_stats and reset_fc_host_stats 717 * (XXX to be checked otherwise introduce locking) 718 */ 719 static struct fc_host_statistics * 720 zfcp_get_fc_host_stats(struct Scsi_Host *shost) 721 { 722 struct zfcp_adapter *adapter; 723 struct fc_host_statistics *fc_stats; 724 struct fsf_qtcb_bottom_port *data; 725 int ret; 726 727 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 728 fc_stats = zfcp_init_fc_host_stats(adapter); 729 if (!fc_stats) 730 return NULL; 731 732 data = kzalloc(sizeof(*data), GFP_KERNEL); 733 if (!data) 734 return NULL; 735 736 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 737 if (ret) { 738 kfree(data); 739 return NULL; /* XXX return zeroed fc_stats? */ 740 } 741 742 if (adapter->stats_reset && 743 ((jiffies/HZ - adapter->stats_reset) < 744 data->seconds_since_last_reset)) { 745 zfcp_adjust_fc_host_stats(fc_stats, data, 746 adapter->stats_reset_data); 747 } else 748 zfcp_set_fc_host_stats(fc_stats, data); 749 750 kfree(data); 751 return fc_stats; 752 } 753 754 static void 755 zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 756 { 757 struct zfcp_adapter *adapter; 758 struct fsf_qtcb_bottom_port *data, *old_data; 759 int ret; 760 761 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 762 data = kzalloc(sizeof(*data), GFP_KERNEL); 763 if (!data) 764 return; 765 766 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 767 if (ret) { 768 kfree(data); 769 } else { 770 adapter->stats_reset = jiffies/HZ; 771 old_data = adapter->stats_reset_data; 772 adapter->stats_reset_data = data; /* finally freed in 773 adater_dequeue */ 774 kfree(old_data); 775 } 776 } 777 778 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 779 { 780 rport->dev_loss_tmo = timeout; 781 } 782 783 struct fc_function_template zfcp_transport_functions = { 784 .show_starget_port_id = 1, 785 .show_starget_port_name = 1, 786 .show_starget_node_name = 1, 787 .show_rport_supported_classes = 1, 788 .show_rport_maxframe_size = 1, 789 .show_rport_dev_loss_tmo = 1, 790 .show_host_node_name = 1, 791 .show_host_port_name = 1, 792 .show_host_permanent_port_name = 1, 793 .show_host_supported_classes = 1, 794 .show_host_supported_speeds = 1, 795 .show_host_maxframe_size = 1, 796 .show_host_serial_number = 1, 797 .get_fc_host_stats = zfcp_get_fc_host_stats, 798 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 799 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 800 /* no functions registered for following dynamic attributes but 801 directly set by LLDD */ 802 .show_host_port_type = 1, 803 .show_host_speed = 1, 804 .show_host_port_id = 1, 805 }; 806 807 /** 808 * ZFCP_DEFINE_SCSI_ATTR 809 * @_name: name of show attribute 810 * @_format: format string 811 * @_value: value to print 812 * 813 * Generates attribute for a unit. 814 */ 815 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ 816 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ 817 char *buf) \ 818 { \ 819 struct scsi_device *sdev; \ 820 struct zfcp_unit *unit; \ 821 \ 822 sdev = to_scsi_device(dev); \ 823 unit = sdev->hostdata; \ 824 return sprintf(buf, _format, _value); \ 825 } \ 826 \ 827 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); 828 829 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); 830 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); 831 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); 832 833 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { 834 &dev_attr_fcp_lun, 835 &dev_attr_wwpn, 836 &dev_attr_hba_id, 837 NULL 838 }; 839 840 #undef ZFCP_LOG_AREA 841