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   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10 #include <asm/atomic.h>
  11
  12 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  13 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  14 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  15 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  16                                   void (*done) (struct scsi_cmnd *));
  17 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  18 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  19 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *);
  20 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  21 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  22                                          struct scsi_cmnd *);
  23
  24 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
  25                                           unsigned int, unsigned int);
  26
  27 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  28 static struct device_attribute *zfcp_a_stats_attrs[];
  29
  30 struct zfcp_data zfcp_data = {
  31         .scsi_host_template = {
  32                 .name                   = "zfcp",
  33                 .module                 = THIS_MODULE,
  34                 .proc_name              = "zfcp",
  35                 .slave_alloc            = zfcp_scsi_slave_alloc,
  36                 .slave_configure        = zfcp_scsi_slave_configure,
  37                 .slave_destroy          = zfcp_scsi_slave_destroy,
  38                 .queuecommand           = zfcp_scsi_queuecommand,
  39                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
  40                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  41                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
  42                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
  43                 .can_queue              = 4096,
  44                 .this_id                = -1,
  45                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
  46                 .cmd_per_lun            = 1,
  47                 .use_clustering         = 1,
  48                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
  49                 .max_sectors            = ZFCP_MAX_SECTORS,
  50                 .shost_attrs            = zfcp_a_stats_attrs,
  51         },
  52 };
  53
  54 /* Find start of Response Information in FCP response unit*/
  55 char *
  56 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  57 {
  58         char *fcp_rsp_info_ptr;
  59
  60         fcp_rsp_info_ptr =
  61             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  62
  63         return fcp_rsp_info_ptr;
  64 }
  65
  66 /* Find start of Sense Information in FCP response unit*/
  67 char *
  68 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  69 {
  70         char *fcp_sns_info_ptr;
  71
  72         fcp_sns_info_ptr =
  73             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  74         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  75                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  76                     fcp_rsp_iu->fcp_rsp_len;
  77
  78         return fcp_sns_info_ptr;
  79 }
  80
  81 static fcp_dl_t *
  82 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
  83 {
  84         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
  85         fcp_dl_t *fcp_dl_addr;
  86
  87         fcp_dl_addr = (fcp_dl_t *)
  88                 ((unsigned char *) fcp_cmd +
  89                  sizeof (struct fcp_cmnd_iu) + additional_length);
  90         /*
  91          * fcp_dl_addr = start address of fcp_cmnd structure +
  92          * size of fixed part + size of dynamically sized add_dcp_cdb field
  93          * SEE FCP-2 documentation
  94          */
  95         return fcp_dl_addr;
  96 }
  97
  98 fcp_dl_t
  99 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 100 {
 101         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 102 }
 103
 104 void
 105 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 106 {
 107         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 108 }
 109
 110 /*
 111  * note: it's a bit-or operation not an assignment
 112  * regarding the specified byte
 113  */
 114 static inline void
 115 set_byte(int *result, char status, char pos)
 116 {
 117         *result |= status << (pos * 8);
 118 }
 119
 120 void
 121 set_host_byte(int *result, char status)
 122 {
 123         set_byte(result, status, 2);
 124 }
 125
 126 void
 127 set_driver_byte(int *result, char status)
 128 {
 129         set_byte(result, status, 3);
 130 }
 131
 132 static int
 133 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 134 {
 135         struct zfcp_adapter *adapter;
 136         struct zfcp_unit *unit;
 137         unsigned long flags;
 138         int retval = -ENXIO;
 139
 140         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 141         if (!adapter)
 142                 goto out;
 143
 144         read_lock_irqsave(&zfcp_data.config_lock, flags);
 145         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 146         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 147                                      &unit->status)) {
 148                 sdp->hostdata = unit;
 149                 unit->device = sdp;
 150                 zfcp_unit_get(unit);
 151                 retval = 0;
 152         }
 153         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 154  out:
 155         return retval;
 156 }
 157
 158 /**
 159  * zfcp_scsi_slave_destroy - called when scsi device is removed
 160  *
 161  * Remove reference to associated scsi device for an zfcp_unit.
 162  * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
 163  * or a scan for this device might have failed.
 164  */
 165 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 166 {
 167         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 168         WARN_ON(!unit);
 169         if (unit) {
 170                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 171                 sdpnt->hostdata = NULL;
 172                 unit->device = NULL;
 173                 zfcp_erp_unit_failed(unit, 12, NULL);
 174                 zfcp_unit_put(unit);
 175         }
 176 }
 177
 178 /*
 179  * called from scsi midlayer to allow finetuning of a device.
 180  */
 181 static int
 182 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 183 {
 184         if (sdp->tagged_supported)
 185                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 186         else
 187                 scsi_adjust_queue_depth(sdp, 0, 1);
 188         return 0;
 189 }
 190
 191 /**
 192  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 193  * @scpnt: pointer to struct scsi_cmnd where result is set
 194  * @result: result to be set in scpnt (e.g. DID_ERROR)
 195  */
 196 static void
 197 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 198 {
 199         set_host_byte(&scpnt->result, result);
 200         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 201                 zfcp_scsi_dbf_event_result("fail", 4,
 202                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 203                         scpnt, NULL);
 204         /* return directly */
 205         scpnt->scsi_done(scpnt);
 206 }
 207
 208 /**
 209  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 210  *      zfcp_scsi_command_sync
 211  * @adapter: adapter where scsi command is issued
 212  * @unit: unit to which scsi command is sent
 213  * @scpnt: scsi command to be sent
 214  * @timer: timer to be started if request is successfully initiated
 215  *
 216  * Note: In scsi_done function must be set in scpnt.
 217  */
 218 int
 219 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 220                         struct scsi_cmnd *scpnt, int use_timer)
 221 {
 222         int tmp;
 223         int retval;
 224
 225         retval = 0;
 226
 227         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 228         BUG_ON(scpnt->scsi_done == NULL);
 229
 230         if (unlikely(NULL == unit)) {
 231                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 232                 goto out;
 233         }
 234
 235         if (unlikely(
 236               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 237              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 238                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 239                 goto out;
 240         }
 241
 242         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
 243                                              ZFCP_REQ_AUTO_CLEANUP);
 244         if (unlikely(tmp == -EBUSY)) {
 245                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 246                 goto out;
 247         }
 248
 249         if (unlikely(tmp < 0))
 250                 retval = SCSI_MLQUEUE_HOST_BUSY;
 251
 252 out:
 253         return retval;
 254 }
 255
 256 static void
 257 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 258 {
 259         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 260         complete(wait);
 261 }
 262
 263
 264 /**
 265  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 266  * @unit: unit where command is sent to
 267  * @scpnt: scsi command to be sent
 268  * @use_timer: indicates whether timer should be setup or not
 269  * Return: 0
 270  *
 271  * Errors are indicated in scpnt->result
 272  */
 273 int
 274 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 275                        int use_timer)
 276 {
 277         int ret;
 278         DECLARE_COMPLETION_ONSTACK(wait);
 279
 280         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 281         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 282         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
 283                                       use_timer);
 284         if (ret == 0)
 285                 wait_for_completion(&wait);
 286
 287         scpnt->SCp.ptr = NULL;
 288
 289         return 0;
 290 }
 291
 292 /*
 293  * function:    zfcp_scsi_queuecommand
 294  *
 295  * purpose:     enqueues a SCSI command to the specified target device
 296  *
 297  * returns:     0 - success, SCSI command enqueued
 298  *              !0 - failure
 299  */
 300 static int
 301 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 302                        void (*done) (struct scsi_cmnd *))
 303 {
 304         struct zfcp_unit *unit;
 305         struct zfcp_adapter *adapter;
 306
 307         /* reset the status for this request */
 308         scpnt->result = 0;
 309         scpnt->host_scribble = NULL;
 310         scpnt->scsi_done = done;
 311
 312         /*
 313          * figure out adapter and target device
 314          * (stored there by zfcp_scsi_slave_alloc)
 315          */
 316         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 317         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 318
 319         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 320 }
 321
 322 static struct zfcp_unit *
 323 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 324                  unsigned int lun)
 325 {
 326         struct zfcp_port *port;
 327         struct zfcp_unit *unit, *retval = NULL;
 328
 329         list_for_each_entry(port, &adapter->port_list_head, list) {
 330                 if (!port->rport || (id != port->rport->scsi_target_id))
 331                         continue;
 332                 list_for_each_entry(unit, &port->unit_list_head, list)
 333                         if (lun == unit->scsi_lun) {
 334                                 retval = unit;
 335                                 goto out;
 336                         }
 337         }
 338  out:
 339         return retval;
 340 }
 341
 342 /**
 343  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 344  * @scpnt: pointer to scsi_cmnd to be aborted
 345  * Return: SUCCESS - command has been aborted and cleaned up in internal
 346  *          bookkeeping, SCSI stack won't be called for aborted command
 347  *         FAILED - otherwise
 348  *
 349  * We do not need to care for a SCSI command which completes normally
 350  * but late during this abort routine runs.  We are allowed to return
 351  * late commands to the SCSI stack.  It tracks the state of commands and
 352  * will handle late commands.  (Usually, the normal completion of late
 353  * commands is ignored with respect to the running abort operation.)
 354  */
 355 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 356 {
 357         struct Scsi_Host *scsi_host;
 358         struct zfcp_adapter *adapter;
 359         struct zfcp_unit *unit;
 360         struct zfcp_fsf_req *fsf_req;
 361         unsigned long flags;
 362         unsigned long old_req_id;
 363         int retval = SUCCESS;
 364
 365         scsi_host = scpnt->device->host;
 366         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 367         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 368
 369         /* avoid race condition between late normal completion and abort */
 370         write_lock_irqsave(&adapter->abort_lock, flags);
 371
 372         /* Check whether corresponding fsf_req is still pending */
 373         spin_lock(&adapter->req_list_lock);
 374         fsf_req = zfcp_reqlist_find(adapter,
 375                                     (unsigned long) scpnt->host_scribble);
 376         spin_unlock(&adapter->req_list_lock);
 377         if (!fsf_req) {
 378                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 379                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 380                 retval = SUCCESS;
 381                 goto out;
 382         }
 383         fsf_req->data = 0;
 384         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 385         old_req_id = fsf_req->req_id;
 386
 387         /* don't access old fsf_req after releasing the abort_lock */
 388         write_unlock_irqrestore(&adapter->abort_lock, flags);
 389
 390         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 391         if (!fsf_req) {
 392                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 393                                           old_req_id);
 394                 retval = FAILED;
 395                 goto out;
 396         }
 397
 398         __wait_event(fsf_req->completion_wq,
 399                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 400
 401         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 402                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 403                 retval = SUCCESS;
 404         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 405                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 406                 retval = SUCCESS;
 407         } else {
 408                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 409                 retval = FAILED;
 410         }
 411         zfcp_fsf_req_free(fsf_req);
 412  out:
 413         return retval;
 414 }
 415
 416 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 417 {
 418         int retval;
 419         struct zfcp_unit *unit = scpnt->device->hostdata;
 420
 421         if (!unit) {
 422                 WARN_ON(1);
 423                 return SUCCESS;
 424         }
 425         retval = zfcp_task_management_function(unit,
 426                                                FCP_LOGICAL_UNIT_RESET,
 427                                                scpnt);
 428         return retval ? FAILED : SUCCESS;
 429 }
 430
 431 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 432 {
 433         int retval;
 434         struct zfcp_unit *unit = scpnt->device->hostdata;
 435
 436         if (!unit) {
 437                 WARN_ON(1);
 438                 return SUCCESS;
 439         }
 440         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 441         return retval ? FAILED : SUCCESS;
 442 }
 443
 444 static int
 445 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 446                               struct scsi_cmnd *scpnt)
 447 {
 448         struct zfcp_adapter *adapter = unit->port->adapter;
 449         struct zfcp_fsf_req *fsf_req;
 450         int retval = 0;
 451
 452         /* issue task management function */
 453         fsf_req = zfcp_fsf_send_fcp_command_task_management
 454                 (adapter, unit, tm_flags, 0);
 455         if (!fsf_req) {
 456                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 457                 retval = -ENOMEM;
 458                 goto out;
 459         }
 460
 461         __wait_event(fsf_req->completion_wq,
 462                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 463
 464         /*
 465          * check completion status of task management function
 466          */
 467         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 468                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 469                 retval = -EIO;
 470         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 471                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 472                 retval = -ENOTSUPP;
 473         } else
 474                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 475
 476         zfcp_fsf_req_free(fsf_req);
 477  out:
 478         return retval;
 479 }
 480
 481 /**
 482  * zfcp_scsi_eh_host_reset_handler - handler for host reset
 483  */
 484 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 485 {
 486         struct zfcp_unit *unit;
 487         struct zfcp_adapter *adapter;
 488
 489         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 490         adapter = unit->port->adapter;
 491         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 492         zfcp_erp_wait(adapter);
 493
 494         return SUCCESS;
 495 }
 496
 497 int
 498 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 499 {
 500         int retval = 0;
 501         static unsigned int unique_id = 0;
 502
 503         if (adapter->scsi_host)
 504                 goto out;
 505
 506         /* register adapter as SCSI host with mid layer of SCSI stack */
 507         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 508                                              sizeof (struct zfcp_adapter *));
 509         if (!adapter->scsi_host) {
 510                 dev_err(&adapter->ccw_device->dev,
 511                         "registration with SCSI stack failed.");
 512                 retval = -EIO;
 513                 goto out;
 514         }
 515
 516         /* tell the SCSI stack some characteristics of this adapter */
 517         adapter->scsi_host->max_id = 1;
 518         adapter->scsi_host->max_lun = 1;
 519         adapter->scsi_host->max_channel = 0;
 520         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 521         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 522         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 523
 524         /*
 525          * save a pointer to our own adapter data structure within
 526          * hostdata field of SCSI host data structure
 527          */
 528         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 529
 530         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 531                 scsi_host_put(adapter->scsi_host);
 532                 retval = -EIO;
 533                 goto out;
 534         }
 535         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 536  out:
 537         return retval;
 538 }
 539
 540 void
 541 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 542 {
 543         struct Scsi_Host *shost;
 544         struct zfcp_port *port;
 545
 546         shost = adapter->scsi_host;
 547         if (!shost)
 548                 return;
 549         read_lock_irq(&zfcp_data.config_lock);
 550         list_for_each_entry(port, &adapter->port_list_head, list)
 551                 if (port->rport)
 552                         port->rport = NULL;
 553         read_unlock_irq(&zfcp_data.config_lock);
 554         fc_remove_host(shost);
 555         scsi_remove_host(shost);
 556         scsi_host_put(shost);
 557         adapter->scsi_host = NULL;
 558         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 559
 560         return;
 561 }
 562
 563 /*
 564  * Support functions for FC transport class
 565  */
 566 static struct fc_host_statistics*
 567 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 568 {
 569         struct fc_host_statistics *fc_stats;
 570
 571         if (!adapter->fc_stats) {
 572                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 573                 if (!fc_stats)
 574                         return NULL;
 575                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 576         }
 577         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 578         return adapter->fc_stats;
 579 }
 580
 581 static void
 582 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 583                           struct fsf_qtcb_bottom_port *data,
 584                           struct fsf_qtcb_bottom_port *old)
 585 {
 586         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 587                 old->seconds_since_last_reset;
 588         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 589         fc_stats->tx_words = data->tx_words - old->tx_words;
 590         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 591         fc_stats->rx_words = data->rx_words - old->rx_words;
 592         fc_stats->lip_count = data->lip - old->lip;
 593         fc_stats->nos_count = data->nos - old->nos;
 594         fc_stats->error_frames = data->error_frames - old->error_frames;
 595         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 596         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 597         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 598         fc_stats->loss_of_signal_count = data->loss_of_signal -
 599                 old->loss_of_signal;
 600         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 601                 old->psp_error_counts;
 602         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 603                 old->invalid_tx_words;
 604         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 605         fc_stats->fcp_input_requests = data->input_requests -
 606                 old->input_requests;
 607         fc_stats->fcp_output_requests = data->output_requests -
 608                 old->output_requests;
 609         fc_stats->fcp_control_requests = data->control_requests -
 610                 old->control_requests;
 611         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 612         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 613 }
 614
 615 static void
 616 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 617                        struct fsf_qtcb_bottom_port *data)
 618 {
 619         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 620         fc_stats->tx_frames = data->tx_frames;
 621         fc_stats->tx_words = data->tx_words;
 622         fc_stats->rx_frames = data->rx_frames;
 623         fc_stats->rx_words = data->rx_words;
 624         fc_stats->lip_count = data->lip;
 625         fc_stats->nos_count = data->nos;
 626         fc_stats->error_frames = data->error_frames;
 627         fc_stats->dumped_frames = data->dumped_frames;
 628         fc_stats->link_failure_count = data->link_failure;
 629         fc_stats->loss_of_sync_count = data->loss_of_sync;
 630         fc_stats->loss_of_signal_count = data->loss_of_signal;
 631         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 632         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 633         fc_stats->invalid_crc_count = data->invalid_crcs;
 634         fc_stats->fcp_input_requests = data->input_requests;
 635         fc_stats->fcp_output_requests = data->output_requests;
 636         fc_stats->fcp_control_requests = data->control_requests;
 637         fc_stats->fcp_input_megabytes = data->input_mb;
 638         fc_stats->fcp_output_megabytes = data->output_mb;
 639 }
 640
 641 /**
 642  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 643  *
 644  * assumption: scsi_transport_fc synchronizes calls of
 645  *             get_fc_host_stats and reset_fc_host_stats
 646  *             (XXX to be checked otherwise introduce locking)
 647  */
 648 static struct fc_host_statistics *
 649 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 650 {
 651         struct zfcp_adapter *adapter;
 652         struct fc_host_statistics *fc_stats;
 653         struct fsf_qtcb_bottom_port *data;
 654         int ret;
 655
 656         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 657         fc_stats = zfcp_init_fc_host_stats(adapter);
 658         if (!fc_stats)
 659                 return NULL;
 660
 661         data = kzalloc(sizeof(*data), GFP_KERNEL);
 662         if (!data)
 663                 return NULL;
 664
 665         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 666         if (ret) {
 667                 kfree(data);
 668                 return NULL; /* XXX return zeroed fc_stats? */
 669         }
 670
 671         if (adapter->stats_reset &&
 672             ((jiffies/HZ - adapter->stats_reset) <
 673              data->seconds_since_last_reset)) {
 674                 zfcp_adjust_fc_host_stats(fc_stats, data,
 675                                           adapter->stats_reset_data);
 676         } else
 677                 zfcp_set_fc_host_stats(fc_stats, data);
 678
 679         kfree(data);
 680         return fc_stats;
 681 }
 682
 683 static void
 684 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 685 {
 686         struct zfcp_adapter *adapter;
 687         struct fsf_qtcb_bottom_port *data, *old_data;
 688         int ret;
 689
 690         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 691         data = kzalloc(sizeof(*data), GFP_KERNEL);
 692         if (!data)
 693                 return;
 694
 695         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 696         if (ret) {
 697                 kfree(data);
 698         } else {
 699                 adapter->stats_reset = jiffies/HZ;
 700                 old_data = adapter->stats_reset_data;
 701                 adapter->stats_reset_data = data; /* finally freed in
 702                                                      adater_dequeue */
 703                 kfree(old_data);
 704         }
 705 }
 706
 707 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 708 {
 709         rport->dev_loss_tmo = timeout;
 710 }
 711
 712 struct fc_function_template zfcp_transport_functions = {
 713         .show_starget_port_id = 1,
 714         .show_starget_port_name = 1,
 715         .show_starget_node_name = 1,
 716         .show_rport_supported_classes = 1,
 717         .show_rport_maxframe_size = 1,
 718         .show_rport_dev_loss_tmo = 1,
 719         .show_host_node_name = 1,
 720         .show_host_port_name = 1,
 721         .show_host_permanent_port_name = 1,
 722         .show_host_supported_classes = 1,
 723         .show_host_supported_speeds = 1,
 724         .show_host_maxframe_size = 1,
 725         .show_host_serial_number = 1,
 726         .get_fc_host_stats = zfcp_get_fc_host_stats,
 727         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 728         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 729         /* no functions registered for following dynamic attributes but
 730            directly set by LLDD */
 731         .show_host_port_type = 1,
 732         .show_host_speed = 1,
 733         .show_host_port_id = 1,
 734         .disable_target_scan = 1,
 735 };
 736
 737 #define ZFCP_DEFINE_LATENCY_ATTR(_name)                                 \
 738 static ssize_t                                                          \
 739 zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,              \
 740                                        struct device_attribute *attr,   \
 741                                        char *buf) {                     \
 742         struct scsi_device *sdev = to_scsi_device(dev);                 \
 743         struct zfcp_unit *unit = sdev->hostdata;                        \
 744         struct zfcp_latencies *lat = &unit->latencies;                  \
 745         struct zfcp_adapter *adapter = unit->port->adapter;             \
 746         unsigned long flags;                                            \
 747         unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;      \
 748                                                                         \
 749         spin_lock_irqsave(&lat->lock, flags);                           \
 750         fsum = lat->_name.fabric.sum * adapter->timer_ticks;            \
 751         fmin = lat->_name.fabric.min * adapter->timer_ticks;            \
 752         fmax = lat->_name.fabric.max * adapter->timer_ticks;            \
 753         csum = lat->_name.channel.sum * adapter->timer_ticks;           \
 754         cmin = lat->_name.channel.min * adapter->timer_ticks;           \
 755         cmax = lat->_name.channel.max * adapter->timer_ticks;           \
 756         cc  = lat->_name.counter;                                       \
 757         spin_unlock_irqrestore(&lat->lock, flags);                      \
 758                                                                         \
 759         do_div(fsum, 1000);                                             \
 760         do_div(fmin, 1000);                                             \
 761         do_div(fmax, 1000);                                             \
 762         do_div(csum, 1000);                                             \
 763         do_div(cmin, 1000);                                             \
 764         do_div(cmax, 1000);                                             \
 765                                                                         \
 766         return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",     \
 767                        fmin, fmax, fsum, cmin, cmax, csum, cc);         \
 768 }                                                                       \
 769 static ssize_t                                                          \
 770 zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,             \
 771                                         struct device_attribute *attr,  \
 772                                         const char *buf, size_t count)  \
 773 {                                                                       \
 774         struct scsi_device *sdev = to_scsi_device(dev);                 \
 775         struct zfcp_unit *unit = sdev->hostdata;                        \
 776         struct zfcp_latencies *lat = &unit->latencies;                  \
 777         unsigned long flags;                                            \
 778                                                                         \
 779         spin_lock_irqsave(&lat->lock, flags);                           \
 780         lat->_name.fabric.sum = 0;                                      \
 781         lat->_name.fabric.min = 0xFFFFFFFF;                             \
 782         lat->_name.fabric.max = 0;                                      \
 783         lat->_name.channel.sum = 0;                                     \
 784         lat->_name.channel.min = 0xFFFFFFFF;                            \
 785         lat->_name.channel.max = 0;                                     \
 786         lat->_name.counter = 0;                                         \
 787         spin_unlock_irqrestore(&lat->lock, flags);                      \
 788                                                                         \
 789         return (ssize_t) count;                                         \
 790 }                                                                       \
 791 static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,                  \
 792                    zfcp_sysfs_unit_##_name##_latency_show,              \
 793                    zfcp_sysfs_unit_##_name##_latency_store);
 794
 795 ZFCP_DEFINE_LATENCY_ATTR(read);
 796 ZFCP_DEFINE_LATENCY_ATTR(write);
 797 ZFCP_DEFINE_LATENCY_ATTR(cmd);
 798
 799 /**
 800  * ZFCP_DEFINE_SCSI_ATTR
 801  * @_name:   name of show attribute
 802  * @_format: format string
 803  * @_value:  value to print
 804  *
 805  * Generates attribute for a unit.
 806  */
 807 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 808 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 809                                               char *buf)                 \
 810 {                                                                        \
 811         struct scsi_device *sdev;                                        \
 812         struct zfcp_unit *unit;                                          \
 813                                                                          \
 814         sdev = to_scsi_device(dev);                                      \
 815         unit = sdev->hostdata;                                           \
 816         return sprintf(buf, _format, _value);                            \
 817 }                                                                        \
 818                                                                          \
 819 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 820
 821 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 822 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 823 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 824
 825 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 826         &dev_attr_fcp_lun,
 827         &dev_attr_wwpn,
 828         &dev_attr_hba_id,
 829         &dev_attr_read_latency,
 830         &dev_attr_write_latency,
 831         &dev_attr_cmd_latency,
 832         NULL
 833 };
 834
 835 static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
 836                                             struct device_attribute *attr,
 837                                             char *buf)
 838 {
 839         struct Scsi_Host *scsi_host = dev_to_shost(dev);
 840         struct fsf_qtcb_bottom_port *qtcb_port;
 841         int retval;
 842         struct zfcp_adapter *adapter;
 843
 844         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 845         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
 846                 return -EOPNOTSUPP;
 847
 848         qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
 849         if (!qtcb_port)
 850                 return -ENOMEM;
 851
 852         retval = zfcp_fsf_exchange_port_data_sync(adapter, qtcb_port);
 853         if (!retval)
 854                 retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
 855                                  qtcb_port->cb_util, qtcb_port->a_util);
 856         kfree(qtcb_port);
 857         return retval;
 858 }
 859
 860 static int zfcp_sysfs_adapter_ex_config(struct device *dev,
 861                                         struct fsf_statistics_info *stat_inf)
 862 {
 863         int retval;
 864         struct fsf_qtcb_bottom_config *qtcb_config;
 865         struct Scsi_Host *scsi_host = dev_to_shost(dev);
 866         struct zfcp_adapter *adapter;
 867
 868         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 869         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
 870                 return -EOPNOTSUPP;
 871
 872         qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
 873                                GFP_KERNEL);
 874         if (!qtcb_config)
 875                 return -ENOMEM;
 876
 877         retval = zfcp_fsf_exchange_config_data_sync(adapter, qtcb_config);
 878         if (!retval)
 879                 *stat_inf = qtcb_config->stat_info;
 880
 881         kfree(qtcb_config);
 882         return retval;
 883 }
 884
 885 static ssize_t zfcp_sysfs_adapter_request_show(struct device *dev,
 886                                                struct device_attribute *attr,
 887                                                char *buf)
 888 {
 889         struct fsf_statistics_info stat_info;
 890         int retval;
 891
 892         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 893         if (retval)
 894                 return retval;
 895
 896         return sprintf(buf, "%llu %llu %llu\n",
 897                        (unsigned long long) stat_info.input_req,
 898                        (unsigned long long) stat_info.output_req,
 899                        (unsigned long long) stat_info.control_req);
 900 }
 901
 902 static ssize_t zfcp_sysfs_adapter_mb_show(struct device *dev,
 903                                           struct device_attribute *attr,
 904                                           char *buf)
 905 {
 906         struct fsf_statistics_info stat_info;
 907         int retval;
 908
 909         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 910         if (retval)
 911                 return retval;
 912
 913         return sprintf(buf, "%llu %llu\n",
 914                        (unsigned long long) stat_info.input_mb,
 915                        (unsigned long long) stat_info.output_mb);
 916 }
 917
 918 static ssize_t zfcp_sysfs_adapter_sec_active_show(struct device *dev,
 919                                                   struct device_attribute *attr,
 920                                                   char *buf)
 921 {
 922         struct fsf_statistics_info stat_info;
 923         int retval;
 924
 925         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 926         if (retval)
 927                 return retval;
 928
 929         return sprintf(buf, "%llu\n",
 930                        (unsigned long long) stat_info.seconds_act);
 931 }
 932
 933 static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);
 934 static DEVICE_ATTR(requests, S_IRUGO, zfcp_sysfs_adapter_request_show, NULL);
 935 static DEVICE_ATTR(megabytes, S_IRUGO, zfcp_sysfs_adapter_mb_show, NULL);
 936 static DEVICE_ATTR(seconds_active, S_IRUGO,
 937                    zfcp_sysfs_adapter_sec_active_show, NULL);
 938
 939 static struct device_attribute *zfcp_a_stats_attrs[] = {
 940         &dev_attr_utilization,
 941         &dev_attr_requests,
 942         &dev_attr_megabytes,
 943         &dev_attr_seconds_active,
 944         NULL
 945 };