drivers/s390/scsi/zfcp_scsi.c

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