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