git.oblomov.eu Git - linux-2.6/blob - drivers/s390/scsi/zfcp_aux.c

   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 /*
  23  * Driver authors:
  24  *            Martin Peschke (originator of the driver)
  25  *            Raimund Schroeder
  26  *            Aron Zeh
  27  *            Wolfgang Taphorn
  28  *            Stefan Bader
  29  *            Heiko Carstens (kernel 2.6 port of the driver)
  30  *            Andreas Herrmann
  31  *            Maxim Shchetynin
  32  *            Volker Sameske
  33  *            Ralph Wuerthner
  34  */
  35
  36 #include "zfcp_ext.h"
  37
  38 /* accumulated log level (module parameter) */
  39 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
  40 static char *device;
  41 /*********************** FUNCTION PROTOTYPES *********************************/
  42
  43 /* written against the module interface */
  44 static int __init  zfcp_module_init(void);
  45
  46 /* FCP related */
  47 static void zfcp_ns_gid_pn_handler(unsigned long);
  48
  49 /* miscellaneous */
  50 static int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
  51 static void zfcp_sg_list_free(struct zfcp_sg_list *);
  52 static int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
  53                                        void __user *, size_t);
  54 static int zfcp_sg_list_copy_to_user(void __user *,
  55                                      struct zfcp_sg_list *, size_t);
  56 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
  57
  58 #define ZFCP_CFDC_IOC_MAGIC                     0xDD
  59 #define ZFCP_CFDC_IOC \
  60         _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
  61
  62
  63 static const struct file_operations zfcp_cfdc_fops = {
  64         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
  65 #ifdef CONFIG_COMPAT
  66         .compat_ioctl = zfcp_cfdc_dev_ioctl
  67 #endif
  68 };
  69
  70 static struct miscdevice zfcp_cfdc_misc = {
  71         .minor = ZFCP_CFDC_DEV_MINOR,
  72         .name = ZFCP_CFDC_DEV_NAME,
  73         .fops = &zfcp_cfdc_fops
  74 };
  75
  76 /*********************** KERNEL/MODULE PARAMETERS  ***************************/
  77
  78 /* declare driver module init/cleanup functions */
  79 module_init(zfcp_module_init);
  80
  81 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  82 MODULE_DESCRIPTION
  83     ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
  84 MODULE_LICENSE("GPL");
  85
  86 module_param(device, charp, 0400);
  87 MODULE_PARM_DESC(device, "specify initial device");
  88
  89 module_param(loglevel, uint, 0400);
  90 MODULE_PARM_DESC(loglevel,
  91                  "log levels, 8 nibbles: "
  92                  "FC ERP QDIO CIO Config FSF SCSI Other, "
  93                  "levels: 0=none 1=normal 2=devel 3=trace");
  94
  95 /****************************************************************/
  96 /************** Functions without logging ***********************/
  97 /****************************************************************/
  98
  99 void
 100 _zfcp_hex_dump(char *addr, int count)
 101 {
 102         int i;
 103         for (i = 0; i < count; i++) {
 104                 printk("%02x", addr[i]);
 105                 if ((i % 4) == 3)
 106                         printk(" ");
 107                 if ((i % 32) == 31)
 108                         printk("\n");
 109         }
 110         if (((i-1) % 32) != 31)
 111                 printk("\n");
 112 }
 113
 114
 115 /****************************************************************/
 116 /****** Functions to handle the request ID hash table    ********/
 117 /****************************************************************/
 118
 119 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
 120
 121 static int zfcp_reqlist_init(struct zfcp_adapter *adapter)
 122 {
 123         int i;
 124
 125         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
 126                                     GFP_KERNEL);
 127
 128         if (!adapter->req_list)
 129                 return -ENOMEM;
 130
 131         for (i=0; i<REQUEST_LIST_SIZE; i++)
 132                 INIT_LIST_HEAD(&adapter->req_list[i]);
 133
 134         return 0;
 135 }
 136
 137 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
 138 {
 139         struct zfcp_fsf_req *request, *tmp;
 140         unsigned int i;
 141
 142         for (i=0; i<REQUEST_LIST_SIZE; i++) {
 143                 if (list_empty(&adapter->req_list[i]))
 144                         continue;
 145
 146                 list_for_each_entry_safe(request, tmp,
 147                                          &adapter->req_list[i], list)
 148                         list_del(&request->list);
 149         }
 150
 151         kfree(adapter->req_list);
 152 }
 153
 154 void zfcp_reqlist_add(struct zfcp_adapter *adapter,
 155                       struct zfcp_fsf_req *fsf_req)
 156 {
 157         unsigned int i;
 158
 159         i = fsf_req->req_id % REQUEST_LIST_SIZE;
 160         list_add_tail(&fsf_req->list, &adapter->req_list[i]);
 161 }
 162
 163 void zfcp_reqlist_remove(struct zfcp_adapter *adapter, unsigned long req_id)
 164 {
 165         struct zfcp_fsf_req *request, *tmp;
 166         unsigned int i, counter;
 167         u64 dbg_tmp[2];
 168
 169         i = req_id % REQUEST_LIST_SIZE;
 170         BUG_ON(list_empty(&adapter->req_list[i]));
 171
 172         counter = 0;
 173         list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list) {
 174                 if (request->req_id == req_id) {
 175                         dbg_tmp[0] = (u64) atomic_read(&adapter->reqs_active);
 176                         dbg_tmp[1] = (u64) counter;
 177                         debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
 178                         list_del(&request->list);
 179                         break;
 180                 }
 181                 counter++;
 182         }
 183 }
 184
 185 struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *adapter,
 186                                            unsigned long req_id)
 187 {
 188         struct zfcp_fsf_req *request, *tmp;
 189         unsigned int i;
 190
 191         /* 0 is reserved as an invalid req_id */
 192         if (req_id == 0)
 193                 return NULL;
 194
 195         i = req_id % REQUEST_LIST_SIZE;
 196
 197         list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list)
 198                 if (request->req_id == req_id)
 199                         return request;
 200
 201         return NULL;
 202 }
 203
 204 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
 205 {
 206         unsigned int i;
 207
 208         for (i=0; i<REQUEST_LIST_SIZE; i++)
 209                 if (!list_empty(&adapter->req_list[i]))
 210                         return 0;
 211
 212         return 1;
 213 }
 214
 215 #undef ZFCP_LOG_AREA
 216
 217 /****************************************************************/
 218 /************** Uncategorised Functions *************************/
 219 /****************************************************************/
 220
 221 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 222
 223 /**
 224  * zfcp_device_setup - setup function
 225  * @str: pointer to parameter string
 226  *
 227  * Parse "device=..." parameter string.
 228  */
 229 static int __init
 230 zfcp_device_setup(char *devstr)
 231 {
 232         char *tmp, *str;
 233         size_t len;
 234
 235         if (!devstr)
 236                 return 0;
 237
 238         len = strlen(devstr) + 1;
 239         str = kmalloc(len, GFP_KERNEL);
 240         if (!str)
 241                 goto err_out;
 242         memcpy(str, devstr, len);
 243
 244         tmp = strchr(str, ',');
 245         if (!tmp)
 246                 goto err_out;
 247         *tmp++ = '\0';
 248         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 249         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 250
 251         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 252         if (*tmp++ != ',')
 253                 goto err_out;
 254         if (*tmp == '\0')
 255                 goto err_out;
 256
 257         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 258         if (*tmp != '\0')
 259                 goto err_out;
 260         kfree(str);
 261         return 1;
 262
 263  err_out:
 264         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 265         kfree(str);
 266         return 0;
 267 }
 268
 269 static void __init
 270 zfcp_init_device_configure(void)
 271 {
 272         struct zfcp_adapter *adapter;
 273         struct zfcp_port *port;
 274         struct zfcp_unit *unit;
 275
 276         down(&zfcp_data.config_sema);
 277         read_lock_irq(&zfcp_data.config_lock);
 278         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 279         if (adapter)
 280                 zfcp_adapter_get(adapter);
 281         read_unlock_irq(&zfcp_data.config_lock);
 282
 283         if (adapter == NULL)
 284                 goto out_adapter;
 285         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 286         if (!port)
 287                 goto out_port;
 288         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 289         if (!unit)
 290                 goto out_unit;
 291         up(&zfcp_data.config_sema);
 292         ccw_device_set_online(adapter->ccw_device);
 293         zfcp_erp_wait(adapter);
 294         down(&zfcp_data.config_sema);
 295         zfcp_unit_put(unit);
 296  out_unit:
 297         zfcp_port_put(port);
 298  out_port:
 299         zfcp_adapter_put(adapter);
 300  out_adapter:
 301         up(&zfcp_data.config_sema);
 302         return;
 303 }
 304
 305 static int calc_alignment(int size)
 306 {
 307         int align = 1;
 308
 309         if (!size)
 310                 return 0;
 311
 312         while ((size - align) > 0)
 313                 align <<= 1;
 314
 315         return align;
 316 }
 317
 318 static int __init
 319 zfcp_module_init(void)
 320 {
 321         int retval = -ENOMEM;
 322         int size, align;
 323
 324         size = sizeof(struct zfcp_fsf_req_qtcb);
 325         align = calc_alignment(size);
 326         zfcp_data.fsf_req_qtcb_cache =
 327                 kmem_cache_create("zfcp_fsf", size, align, 0, NULL, NULL);
 328         if (!zfcp_data.fsf_req_qtcb_cache)
 329                 goto out;
 330
 331         size = sizeof(struct fsf_status_read_buffer);
 332         align = calc_alignment(size);
 333         zfcp_data.sr_buffer_cache =
 334                 kmem_cache_create("zfcp_sr", size, align, 0, NULL, NULL);
 335         if (!zfcp_data.sr_buffer_cache)
 336                 goto out_sr_cache;
 337
 338         size = sizeof(struct zfcp_gid_pn_data);
 339         align = calc_alignment(size);
 340         zfcp_data.gid_pn_cache =
 341                 kmem_cache_create("zfcp_gid", size, align, 0, NULL, NULL);
 342         if (!zfcp_data.gid_pn_cache)
 343                 goto out_gid_cache;
 344
 345         atomic_set(&zfcp_data.loglevel, loglevel);
 346
 347         /* initialize adapter list */
 348         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 349
 350         /* initialize adapters to be removed list head */
 351         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 352
 353         zfcp_data.scsi_transport_template =
 354                 fc_attach_transport(&zfcp_transport_functions);
 355         if (!zfcp_data.scsi_transport_template)
 356                 goto out_transport;
 357
 358         retval = misc_register(&zfcp_cfdc_misc);
 359         if (retval != 0) {
 360                 ZFCP_LOG_INFO("registration of misc device "
 361                               "zfcp_cfdc failed\n");
 362                 goto out_misc;
 363         }
 364
 365         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 366                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 367
 368         /* Initialise proc semaphores */
 369         sema_init(&zfcp_data.config_sema, 1);
 370
 371         /* initialise configuration rw lock */
 372         rwlock_init(&zfcp_data.config_lock);
 373
 374         /* setup dynamic I/O */
 375         retval = zfcp_ccw_register();
 376         if (retval) {
 377                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 378                 goto out_ccw_register;
 379         }
 380
 381         if (zfcp_device_setup(device))
 382                 zfcp_init_device_configure();
 383
 384         goto out;
 385
 386  out_ccw_register:
 387         misc_deregister(&zfcp_cfdc_misc);
 388  out_misc:
 389         fc_release_transport(zfcp_data.scsi_transport_template);
 390  out_transport:
 391         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 392  out_gid_cache:
 393         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 394  out_sr_cache:
 395         kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
 396  out:
 397         return retval;
 398 }
 399
 400 /*
 401  * function:    zfcp_cfdc_dev_ioctl
 402  *
 403  * purpose:     Handle control file upload/download transaction via IOCTL
 404  *              interface
 405  *
 406  * returns:     0           - Operation completed successfuly
 407  *              -ENOTTY     - Unknown IOCTL command
 408  *              -EINVAL     - Invalid sense data record
 409  *              -ENXIO      - The FCP adapter is not available
 410  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 411  *              -ENOMEM     - Insufficient memory
 412  *              -EFAULT     - User space memory I/O operation fault
 413  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 414  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 415  */
 416 static long
 417 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 418                     unsigned long buffer)
 419 {
 420         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
 421         struct zfcp_adapter *adapter = NULL;
 422         struct zfcp_fsf_req *fsf_req = NULL;
 423         struct zfcp_sg_list *sg_list = NULL;
 424         u32 fsf_command, option;
 425         char *bus_id = NULL;
 426         int retval = 0;
 427
 428         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
 429         if (sense_data == NULL) {
 430                 retval = -ENOMEM;
 431                 goto out;
 432         }
 433
 434         sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 435         if (sg_list == NULL) {
 436                 retval = -ENOMEM;
 437                 goto out;
 438         }
 439
 440         if (command != ZFCP_CFDC_IOC) {
 441                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 442                 retval = -ENOTTY;
 443                 goto out;
 444         }
 445
 446         if ((sense_data_user = (void __user *) buffer) == NULL) {
 447                 ZFCP_LOG_INFO("sense data record is required\n");
 448                 retval = -EINVAL;
 449                 goto out;
 450         }
 451
 452         retval = copy_from_user(sense_data, sense_data_user,
 453                                 sizeof(struct zfcp_cfdc_sense_data));
 454         if (retval) {
 455                 retval = -EFAULT;
 456                 goto out;
 457         }
 458
 459         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
 460                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 461                               ZFCP_CFDC_SIGNATURE);
 462                 retval = -EINVAL;
 463                 goto out;
 464         }
 465
 466         switch (sense_data->command) {
 467
 468         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 469                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 470                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 471                 break;
 472
 473         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 474                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 475                 option = FSF_CFDC_OPTION_FORCE;
 476                 break;
 477
 478         case ZFCP_CFDC_CMND_FULL_ACCESS:
 479                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 480                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 481                 break;
 482
 483         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 484                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 485                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 486                 break;
 487
 488         case ZFCP_CFDC_CMND_UPLOAD:
 489                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 490                 option = 0;
 491                 break;
 492
 493         default:
 494                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 495                               sense_data->command);
 496                 retval = -EINVAL;
 497                 goto out;
 498         }
 499
 500         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 501         if (bus_id == NULL) {
 502                 retval = -ENOMEM;
 503                 goto out;
 504         }
 505         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 506                 (sense_data->devno >> 24),
 507                 (sense_data->devno >> 16) & 0xFF,
 508                 (sense_data->devno & 0xFFFF));
 509
 510         read_lock_irq(&zfcp_data.config_lock);
 511         adapter = zfcp_get_adapter_by_busid(bus_id);
 512         if (adapter)
 513                 zfcp_adapter_get(adapter);
 514         read_unlock_irq(&zfcp_data.config_lock);
 515
 516         kfree(bus_id);
 517
 518         if (adapter == NULL) {
 519                 ZFCP_LOG_INFO("invalid adapter\n");
 520                 retval = -ENXIO;
 521                 goto out;
 522         }
 523
 524         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 525                 retval = zfcp_sg_list_alloc(sg_list,
 526                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 527                 if (retval) {
 528                         retval = -ENOMEM;
 529                         goto out;
 530                 }
 531         }
 532
 533         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
 534             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 535                 retval = zfcp_sg_list_copy_from_user(
 536                         sg_list, &sense_data_user->control_file,
 537                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 538                 if (retval) {
 539                         retval = -EFAULT;
 540                         goto out;
 541                 }
 542         }
 543
 544         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
 545                                        option, sg_list);
 546         if (retval)
 547                 goto out;
 548
 549         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 550             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 551                 retval = -ENXIO;
 552                 goto out;
 553         }
 554
 555         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
 556         memcpy(&sense_data->fsf_status_qual,
 557                &fsf_req->qtcb->header.fsf_status_qual,
 558                sizeof(union fsf_status_qual));
 559         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
 560
 561         retval = copy_to_user(sense_data_user, sense_data,
 562                 sizeof(struct zfcp_cfdc_sense_data));
 563         if (retval) {
 564                 retval = -EFAULT;
 565                 goto out;
 566         }
 567
 568         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
 569                 retval = zfcp_sg_list_copy_to_user(
 570                         &sense_data_user->control_file, sg_list,
 571                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 572                 if (retval) {
 573                         retval = -EFAULT;
 574                         goto out;
 575                 }
 576         }
 577
 578  out:
 579         if (fsf_req != NULL)
 580                 zfcp_fsf_req_free(fsf_req);
 581
 582         if ((adapter != NULL) && (retval != -ENXIO))
 583                 zfcp_adapter_put(adapter);
 584
 585         if (sg_list != NULL) {
 586                 zfcp_sg_list_free(sg_list);
 587                 kfree(sg_list);
 588         }
 589
 590         kfree(sense_data);
 591
 592         return retval;
 593 }
 594
 595
 596 /**
 597  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 598  * @sg_list: structure describing a scatter gather list
 599  * @size: size of scatter-gather list
 600  * Return: 0 on success, else -ENOMEM
 601  *
 602  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 603  * or NULL if we run out of memory. sg_list->count specifies the number of
 604  * elements of the scatter-gather list. The maximum size of a single element
 605  * in the scatter-gather list is PAGE_SIZE.
 606  */
 607 static int
 608 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 609 {
 610         struct scatterlist *sg;
 611         unsigned int i;
 612         int retval = 0;
 613         void *address;
 614
 615         BUG_ON(sg_list == NULL);
 616
 617         sg_list->count = size >> PAGE_SHIFT;
 618         if (size & ~PAGE_MASK)
 619                 sg_list->count++;
 620         sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
 621                               GFP_KERNEL);
 622         if (sg_list->sg == NULL) {
 623                 sg_list->count = 0;
 624                 retval = -ENOMEM;
 625                 goto out;
 626         }
 627
 628         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 629                 sg->length = min(size, PAGE_SIZE);
 630                 sg->offset = 0;
 631                 address = (void *) get_zeroed_page(GFP_KERNEL);
 632                 if (address == NULL) {
 633                         sg_list->count = i;
 634                         zfcp_sg_list_free(sg_list);
 635                         retval = -ENOMEM;
 636                         goto out;
 637                 }
 638                 zfcp_address_to_sg(address, sg);
 639                 size -= sg->length;
 640         }
 641
 642  out:
 643         return retval;
 644 }
 645
 646
 647 /**
 648  * zfcp_sg_list_free - free memory of a scatter-gather list
 649  * @sg_list: structure describing a scatter-gather list
 650  *
 651  * Memory for each element in the scatter-gather list is freed.
 652  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 653  */
 654 static void
 655 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 656 {
 657         struct scatterlist *sg;
 658         unsigned int i;
 659
 660         BUG_ON(sg_list == NULL);
 661
 662         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 663                 free_page((unsigned long) zfcp_sg_to_address(sg));
 664
 665         sg_list->count = 0;
 666         kfree(sg_list->sg);
 667 }
 668
 669 /**
 670  * zfcp_sg_size - determine size of a scatter-gather list
 671  * @sg: array of (struct scatterlist)
 672  * @sg_count: elements in array
 673  * Return: size of entire scatter-gather list
 674  */
 675 size_t
 676 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 677 {
 678         unsigned int i;
 679         struct scatterlist *p;
 680         size_t size;
 681
 682         size = 0;
 683         for (i = 0, p = sg; i < sg_count; i++, p++) {
 684                 BUG_ON(p == NULL);
 685                 size += p->length;
 686         }
 687
 688         return size;
 689 }
 690
 691
 692 /**
 693  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 694  * @sg_list: structure describing a scatter-gather list
 695  * @user_buffer: pointer to buffer in user space
 696  * @size: number of bytes to be copied
 697  * Return: 0 on success, -EFAULT if copy_from_user fails.
 698  */
 699 static int
 700 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 701                             void __user *user_buffer,
 702                             size_t size)
 703 {
 704         struct scatterlist *sg;
 705         unsigned int length;
 706         void *zfcp_buffer;
 707         int retval = 0;
 708
 709         BUG_ON(sg_list == NULL);
 710
 711         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 712                 return -EFAULT;
 713
 714         for (sg = sg_list->sg; size > 0; sg++) {
 715                 length = min((unsigned int)size, sg->length);
 716                 zfcp_buffer = zfcp_sg_to_address(sg);
 717                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 718                         retval = -EFAULT;
 719                         goto out;
 720                 }
 721                 user_buffer += length;
 722                 size -= length;
 723         }
 724
 725  out:
 726         return retval;
 727 }
 728
 729
 730 /**
 731  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 732  * @user_buffer: pointer to buffer in user space
 733  * @sg_list: structure describing a scatter-gather list
 734  * @size: number of bytes to be copied
 735  * Return: 0 on success, -EFAULT if copy_to_user fails
 736  */
 737 static int
 738 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 739                           struct zfcp_sg_list *sg_list,
 740                           size_t size)
 741 {
 742         struct scatterlist *sg;
 743         unsigned int length;
 744         void *zfcp_buffer;
 745         int retval = 0;
 746
 747         BUG_ON(sg_list == NULL);
 748
 749         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 750                 return -EFAULT;
 751
 752         for (sg = sg_list->sg; size > 0; sg++) {
 753                 length = min((unsigned int) size, sg->length);
 754                 zfcp_buffer = zfcp_sg_to_address(sg);
 755                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 756                         retval = -EFAULT;
 757                         goto out;
 758                 }
 759                 user_buffer += length;
 760                 size -= length;
 761         }
 762
 763  out:
 764         return retval;
 765 }
 766
 767
 768 #undef ZFCP_LOG_AREA
 769
 770 /****************************************************************/
 771 /****** Functions for configuration/set-up of structures ********/
 772 /****************************************************************/
 773
 774 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 775
 776 /**
 777  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 778  * @port: pointer to port to search for unit
 779  * @fcp_lun: FCP LUN to search for
 780  * Traverse list of all units of a port and return pointer to a unit
 781  * with the given FCP LUN.
 782  */
 783 struct zfcp_unit *
 784 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 785 {
 786         struct zfcp_unit *unit;
 787         int found = 0;
 788
 789         list_for_each_entry(unit, &port->unit_list_head, list) {
 790                 if ((unit->fcp_lun == fcp_lun) &&
 791                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 792                 {
 793                         found = 1;
 794                         break;
 795                 }
 796         }
 797         return found ? unit : NULL;
 798 }
 799
 800 /**
 801  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 802  * @adapter: pointer to adapter to search for port
 803  * @wwpn: wwpn to search for
 804  * Traverse list of all ports of an adapter and return pointer to a port
 805  * with the given wwpn.
 806  */
 807 struct zfcp_port *
 808 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 809 {
 810         struct zfcp_port *port;
 811         int found = 0;
 812
 813         list_for_each_entry(port, &adapter->port_list_head, list) {
 814                 if ((port->wwpn == wwpn) &&
 815                     !(atomic_read(&port->status) &
 816                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 817                         found = 1;
 818                         break;
 819                 }
 820         }
 821         return found ? port : NULL;
 822 }
 823
 824 /**
 825  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 826  * @adapter: pointer to adapter to search for port
 827  * @d_id: d_id to search for
 828  * Traverse list of all ports of an adapter and return pointer to a port
 829  * with the given d_id.
 830  */
 831 struct zfcp_port *
 832 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 833 {
 834         struct zfcp_port *port;
 835         int found = 0;
 836
 837         list_for_each_entry(port, &adapter->port_list_head, list) {
 838                 if ((port->d_id == d_id) &&
 839                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 840                 {
 841                         found = 1;
 842                         break;
 843                 }
 844         }
 845         return found ? port : NULL;
 846 }
 847
 848 /**
 849  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 850  * @bus_id: bus_id to search for
 851  * Traverse list of all adapters and return pointer to an adapter
 852  * with the given bus_id.
 853  */
 854 struct zfcp_adapter *
 855 zfcp_get_adapter_by_busid(char *bus_id)
 856 {
 857         struct zfcp_adapter *adapter;
 858         int found = 0;
 859
 860         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 861                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 862                              BUS_ID_SIZE) == 0) &&
 863                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 864                                       &adapter->status)){
 865                         found = 1;
 866                         break;
 867                 }
 868         }
 869         return found ? adapter : NULL;
 870 }
 871
 872 /**
 873  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 874  * @port: pointer to port where unit is added
 875  * @fcp_lun: FCP LUN of unit to be enqueued
 876  * Return: pointer to enqueued unit on success, NULL on error
 877  * Locks: config_sema must be held to serialize changes to the unit list
 878  *
 879  * Sets up some unit internal structures and creates sysfs entry.
 880  */
 881 struct zfcp_unit *
 882 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 883 {
 884         struct zfcp_unit *unit, *tmp_unit;
 885         unsigned int scsi_lun;
 886         int found;
 887
 888         /*
 889          * check that there is no unit with this FCP_LUN already in list
 890          * and enqueue it.
 891          * Note: Unlike for the adapter and the port, this is an error
 892          */
 893         read_lock_irq(&zfcp_data.config_lock);
 894         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 895         read_unlock_irq(&zfcp_data.config_lock);
 896         if (unit)
 897                 return NULL;
 898
 899         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 900         if (!unit)
 901                 return NULL;
 902
 903         /* initialise reference count stuff */
 904         atomic_set(&unit->refcount, 0);
 905         init_waitqueue_head(&unit->remove_wq);
 906
 907         unit->port = port;
 908         unit->fcp_lun = fcp_lun;
 909
 910         /* setup for sysfs registration */
 911         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 912         unit->sysfs_device.parent = &port->sysfs_device;
 913         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 914         dev_set_drvdata(&unit->sysfs_device, unit);
 915
 916         /* mark unit unusable as long as sysfs registration is not complete */
 917         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 918
 919         if (device_register(&unit->sysfs_device)) {
 920                 kfree(unit);
 921                 return NULL;
 922         }
 923
 924         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 925                 device_unregister(&unit->sysfs_device);
 926                 return NULL;
 927         }
 928
 929         zfcp_unit_get(unit);
 930
 931         scsi_lun = 0;
 932         found = 0;
 933         write_lock_irq(&zfcp_data.config_lock);
 934         list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
 935                 if (tmp_unit->scsi_lun != scsi_lun) {
 936                         found = 1;
 937                         break;
 938                 }
 939                 scsi_lun++;
 940         }
 941         unit->scsi_lun = scsi_lun;
 942         if (found)
 943                 list_add_tail(&unit->list, &tmp_unit->list);
 944         else
 945                 list_add_tail(&unit->list, &port->unit_list_head);
 946         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 947         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 948         write_unlock_irq(&zfcp_data.config_lock);
 949
 950         port->units++;
 951         zfcp_port_get(port);
 952
 953         return unit;
 954 }
 955
 956 void
 957 zfcp_unit_dequeue(struct zfcp_unit *unit)
 958 {
 959         zfcp_unit_wait(unit);
 960         write_lock_irq(&zfcp_data.config_lock);
 961         list_del(&unit->list);
 962         write_unlock_irq(&zfcp_data.config_lock);
 963         unit->port->units--;
 964         zfcp_port_put(unit->port);
 965         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 966         device_unregister(&unit->sysfs_device);
 967 }
 968
 969 /*
 970  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 971  * commands.
 972  * It also genrates fcp-nameserver request/response buffer and unsolicited
 973  * status read fsf_req buffers.
 974  *
 975  * locks:       must only be called with zfcp_data.config_sema taken
 976  */
 977 static int
 978 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 979 {
 980         adapter->pool.fsf_req_erp =
 981                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 982                                          zfcp_data.fsf_req_qtcb_cache);
 983         if (!adapter->pool.fsf_req_erp)
 984                 return -ENOMEM;
 985
 986         adapter->pool.fsf_req_scsi =
 987                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 988                                          zfcp_data.fsf_req_qtcb_cache);
 989         if (!adapter->pool.fsf_req_scsi)
 990                 return -ENOMEM;
 991
 992         adapter->pool.fsf_req_abort =
 993                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 994                                          zfcp_data.fsf_req_qtcb_cache);
 995         if (!adapter->pool.fsf_req_abort)
 996                 return -ENOMEM;
 997
 998         adapter->pool.fsf_req_status_read =
 999                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
1000                                             sizeof(struct zfcp_fsf_req));
1001         if (!adapter->pool.fsf_req_status_read)
1002                 return -ENOMEM;
1003
1004         adapter->pool.data_status_read =
1005                 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
1006                                          zfcp_data.sr_buffer_cache);
1007         if (!adapter->pool.data_status_read)
1008                 return -ENOMEM;
1009
1010         adapter->pool.data_gid_pn =
1011                 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
1012                                          zfcp_data.gid_pn_cache);
1013         if (!adapter->pool.data_gid_pn)
1014                 return -ENOMEM;
1015
1016         return 0;
1017 }
1018
1019 /**
1020  * zfcp_free_low_mem_buffers - free memory pools of an adapter
1021  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
1022  * locking:  zfcp_data.config_sema must be held
1023  */
1024 static void
1025 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1026 {
1027         if (adapter->pool.fsf_req_erp)
1028                 mempool_destroy(adapter->pool.fsf_req_erp);
1029         if (adapter->pool.fsf_req_scsi)
1030                 mempool_destroy(adapter->pool.fsf_req_scsi);
1031         if (adapter->pool.fsf_req_abort)
1032                 mempool_destroy(adapter->pool.fsf_req_abort);
1033         if (adapter->pool.fsf_req_status_read)
1034                 mempool_destroy(adapter->pool.fsf_req_status_read);
1035         if (adapter->pool.data_status_read)
1036                 mempool_destroy(adapter->pool.data_status_read);
1037         if (adapter->pool.data_gid_pn)
1038                 mempool_destroy(adapter->pool.data_gid_pn);
1039 }
1040
1041 void
1042 zfcp_dummy_release(struct device *dev)
1043 {
1044         return;
1045 }
1046
1047 /*
1048  * Enqueues an adapter at the end of the adapter list in the driver data.
1049  * All adapter internal structures are set up.
1050  * Proc-fs entries are also created.
1051  *
1052  * returns:     0             if a new adapter was successfully enqueued
1053  *              ZFCP_KNOWN    if an adapter with this devno was already present
1054  *              -ENOMEM       if alloc failed
1055  * locks:       config_sema must be held to serialise changes to the adapter list
1056  */
1057 struct zfcp_adapter *
1058 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1059 {
1060         int retval = 0;
1061         struct zfcp_adapter *adapter;
1062
1063         /*
1064          * Note: It is safe to release the list_lock, as any list changes
1065          * are protected by the config_sema, which must be held to get here
1066          */
1067
1068         /* try to allocate new adapter data structure (zeroed) */
1069         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1070         if (!adapter) {
1071                 ZFCP_LOG_INFO("error: allocation of base adapter "
1072                               "structure failed\n");
1073                 goto out;
1074         }
1075
1076         ccw_device->handler = NULL;
1077
1078         /* save ccw_device pointer */
1079         adapter->ccw_device = ccw_device;
1080
1081         retval = zfcp_qdio_allocate_queues(adapter);
1082         if (retval)
1083                 goto queues_alloc_failed;
1084
1085         retval = zfcp_qdio_allocate(adapter);
1086         if (retval)
1087                 goto qdio_allocate_failed;
1088
1089         retval = zfcp_allocate_low_mem_buffers(adapter);
1090         if (retval) {
1091                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1092                 goto failed_low_mem_buffers;
1093         }
1094
1095         /* initialise reference count stuff */
1096         atomic_set(&adapter->refcount, 0);
1097         init_waitqueue_head(&adapter->remove_wq);
1098
1099         /* initialise list of ports */
1100         INIT_LIST_HEAD(&adapter->port_list_head);
1101
1102         /* initialise list of ports to be removed */
1103         INIT_LIST_HEAD(&adapter->port_remove_lh);
1104
1105         /* initialize list of fsf requests */
1106         spin_lock_init(&adapter->req_list_lock);
1107         retval = zfcp_reqlist_init(adapter);
1108         if (retval) {
1109                 ZFCP_LOG_INFO("request list initialization failed\n");
1110                 goto failed_low_mem_buffers;
1111         }
1112
1113         /* initialize debug locks */
1114
1115         spin_lock_init(&adapter->erp_dbf_lock);
1116         spin_lock_init(&adapter->hba_dbf_lock);
1117         spin_lock_init(&adapter->san_dbf_lock);
1118         spin_lock_init(&adapter->scsi_dbf_lock);
1119
1120         /* initialize error recovery stuff */
1121
1122         rwlock_init(&adapter->erp_lock);
1123         sema_init(&adapter->erp_ready_sem, 0);
1124         INIT_LIST_HEAD(&adapter->erp_ready_head);
1125         INIT_LIST_HEAD(&adapter->erp_running_head);
1126
1127         /* initialize abort lock */
1128         rwlock_init(&adapter->abort_lock);
1129
1130         /* initialise some erp stuff */
1131         init_waitqueue_head(&adapter->erp_thread_wqh);
1132         init_waitqueue_head(&adapter->erp_done_wqh);
1133
1134         /* initialize lock of associated request queue */
1135         rwlock_init(&adapter->request_queue.queue_lock);
1136
1137         /* mark adapter unusable as long as sysfs registration is not complete */
1138         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1139
1140         adapter->ccw_device = ccw_device;
1141         dev_set_drvdata(&ccw_device->dev, adapter);
1142
1143         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1144                 goto sysfs_failed;
1145
1146         adapter->generic_services.parent = &adapter->ccw_device->dev;
1147         adapter->generic_services.release = zfcp_dummy_release;
1148         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1149                  "generic_services");
1150
1151         if (device_register(&adapter->generic_services))
1152                 goto generic_services_failed;
1153
1154         /* put allocated adapter at list tail */
1155         write_lock_irq(&zfcp_data.config_lock);
1156         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1157         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1158         write_unlock_irq(&zfcp_data.config_lock);
1159
1160         zfcp_data.adapters++;
1161
1162         goto out;
1163
1164  generic_services_failed:
1165         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1166  sysfs_failed:
1167         dev_set_drvdata(&ccw_device->dev, NULL);
1168  failed_low_mem_buffers:
1169         zfcp_free_low_mem_buffers(adapter);
1170         if (qdio_free(ccw_device) != 0)
1171                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1172                                 zfcp_get_busid_by_adapter(adapter));
1173  qdio_allocate_failed:
1174         zfcp_qdio_free_queues(adapter);
1175  queues_alloc_failed:
1176         kfree(adapter);
1177         adapter = NULL;
1178  out:
1179         return adapter;
1180 }
1181
1182 /*
1183  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1184  *              !0 - struct zfcp_adapter  data structure could not be removed
1185  *                      (e.g. still used)
1186  * locks:       adapter list write lock is assumed to be held by caller
1187  */
1188 void
1189 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1190 {
1191         int retval = 0;
1192         unsigned long flags;
1193
1194         device_unregister(&adapter->generic_services);
1195         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1196         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1197         /* sanity check: no pending FSF requests */
1198         spin_lock_irqsave(&adapter->req_list_lock, flags);
1199         retval = zfcp_reqlist_isempty(adapter);
1200         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1201         if (!retval) {
1202                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1203                                 "%i requests outstanding\n",
1204                                 zfcp_get_busid_by_adapter(adapter), adapter,
1205                                 atomic_read(&adapter->reqs_active));
1206                 retval = -EBUSY;
1207                 goto out;
1208         }
1209
1210         /* remove specified adapter data structure from list */
1211         write_lock_irq(&zfcp_data.config_lock);
1212         list_del(&adapter->list);
1213         write_unlock_irq(&zfcp_data.config_lock);
1214
1215         /* decrease number of adapters in list */
1216         zfcp_data.adapters--;
1217
1218         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1219                        "%i adapters still in list\n",
1220                        zfcp_get_busid_by_adapter(adapter),
1221                        adapter, zfcp_data.adapters);
1222
1223         retval = qdio_free(adapter->ccw_device);
1224         if (retval)
1225                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1226                                 zfcp_get_busid_by_adapter(adapter));
1227
1228         zfcp_free_low_mem_buffers(adapter);
1229         /* free memory of adapter data structure and queues */
1230         zfcp_qdio_free_queues(adapter);
1231         zfcp_reqlist_free(adapter);
1232         kfree(adapter->fc_stats);
1233         kfree(adapter->stats_reset_data);
1234         ZFCP_LOG_TRACE("freeing adapter structure\n");
1235         kfree(adapter);
1236  out:
1237         return;
1238 }
1239
1240 /**
1241  * zfcp_port_enqueue - enqueue port to port list of adapter
1242  * @adapter: adapter where remote port is added
1243  * @wwpn: WWPN of the remote port to be enqueued
1244  * @status: initial status for the port
1245  * @d_id: destination id of the remote port to be enqueued
1246  * Return: pointer to enqueued port on success, NULL on error
1247  * Locks: config_sema must be held to serialize changes to the port list
1248  *
1249  * All port internal structures are set up and the sysfs entry is generated.
1250  * d_id is used to enqueue ports with a well known address like the Directory
1251  * Service for nameserver lookup.
1252  */
1253 struct zfcp_port *
1254 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1255                   u32 d_id)
1256 {
1257         struct zfcp_port *port;
1258         int check_wwpn;
1259
1260         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1261         /*
1262          * check that there is no port with this WWPN already in list
1263          */
1264         if (check_wwpn) {
1265                 read_lock_irq(&zfcp_data.config_lock);
1266                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1267                 read_unlock_irq(&zfcp_data.config_lock);
1268                 if (port)
1269                         return NULL;
1270         }
1271
1272         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1273         if (!port)
1274                 return NULL;
1275
1276         /* initialise reference count stuff */
1277         atomic_set(&port->refcount, 0);
1278         init_waitqueue_head(&port->remove_wq);
1279
1280         INIT_LIST_HEAD(&port->unit_list_head);
1281         INIT_LIST_HEAD(&port->unit_remove_lh);
1282
1283         port->adapter = adapter;
1284
1285         if (check_wwpn)
1286                 port->wwpn = wwpn;
1287
1288         atomic_set_mask(status, &port->status);
1289
1290         /* setup for sysfs registration */
1291         if (status & ZFCP_STATUS_PORT_WKA) {
1292                 switch (d_id) {
1293                 case ZFCP_DID_DIRECTORY_SERVICE:
1294                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1295                                  "directory");
1296                         break;
1297                 case ZFCP_DID_MANAGEMENT_SERVICE:
1298                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1299                                  "management");
1300                         break;
1301                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1302                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1303                                  "key_distribution");
1304                         break;
1305                 case ZFCP_DID_ALIAS_SERVICE:
1306                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1307                                  "alias");
1308                         break;
1309                 case ZFCP_DID_TIME_SERVICE:
1310                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1311                                  "time");
1312                         break;
1313                 default:
1314                         kfree(port);
1315                         return NULL;
1316                 }
1317                 port->d_id = d_id;
1318                 port->sysfs_device.parent = &adapter->generic_services;
1319         } else {
1320                 snprintf(port->sysfs_device.bus_id,
1321                          BUS_ID_SIZE, "0x%016llx", wwpn);
1322                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1323         }
1324         port->sysfs_device.release = zfcp_sysfs_port_release;
1325         dev_set_drvdata(&port->sysfs_device, port);
1326
1327         /* mark port unusable as long as sysfs registration is not complete */
1328         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1329
1330         if (device_register(&port->sysfs_device)) {
1331                 kfree(port);
1332                 return NULL;
1333         }
1334
1335         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1336                 device_unregister(&port->sysfs_device);
1337                 return NULL;
1338         }
1339
1340         zfcp_port_get(port);
1341
1342         write_lock_irq(&zfcp_data.config_lock);
1343         list_add_tail(&port->list, &adapter->port_list_head);
1344         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1345         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1346         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1347                 if (!adapter->nameserver_port)
1348                         adapter->nameserver_port = port;
1349         adapter->ports++;
1350         write_unlock_irq(&zfcp_data.config_lock);
1351
1352         zfcp_adapter_get(adapter);
1353
1354         return port;
1355 }
1356
1357 void
1358 zfcp_port_dequeue(struct zfcp_port *port)
1359 {
1360         zfcp_port_wait(port);
1361         write_lock_irq(&zfcp_data.config_lock);
1362         list_del(&port->list);
1363         port->adapter->ports--;
1364         write_unlock_irq(&zfcp_data.config_lock);
1365         if (port->rport)
1366                 fc_remote_port_delete(port->rport);
1367         port->rport = NULL;
1368         zfcp_adapter_put(port->adapter);
1369         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1370                                      atomic_read(&port->status));
1371         device_unregister(&port->sysfs_device);
1372 }
1373
1374 /* Enqueues a nameserver port */
1375 int
1376 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1377 {
1378         struct zfcp_port *port;
1379
1380         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1381                                  ZFCP_DID_DIRECTORY_SERVICE);
1382         if (!port) {
1383                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1384                               "adapter %s failed\n",
1385                               zfcp_get_busid_by_adapter(adapter));
1386                 return -ENXIO;
1387         }
1388         zfcp_port_put(port);
1389
1390         return 0;
1391 }
1392
1393 #undef ZFCP_LOG_AREA
1394
1395 /****************************************************************/
1396 /******* Fibre Channel Standard related Functions  **************/
1397 /****************************************************************/
1398
1399 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1400
1401 void
1402 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1403                            struct fsf_status_read_buffer *status_buffer)
1404 {
1405         struct fcp_rscn_head *fcp_rscn_head;
1406         struct fcp_rscn_element *fcp_rscn_element;
1407         struct zfcp_port *port;
1408         u16 i;
1409         u16 no_entries;
1410         u32 range_mask;
1411         unsigned long flags;
1412
1413         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1414         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1415
1416         /* see FC-FS */
1417         no_entries = (fcp_rscn_head->payload_len / 4);
1418
1419         for (i = 1; i < no_entries; i++) {
1420                 /* skip head and start with 1st element */
1421                 fcp_rscn_element++;
1422                 switch (fcp_rscn_element->addr_format) {
1423                 case ZFCP_PORT_ADDRESS:
1424                         range_mask = ZFCP_PORTS_RANGE_PORT;
1425                         break;
1426                 case ZFCP_AREA_ADDRESS:
1427                         range_mask = ZFCP_PORTS_RANGE_AREA;
1428                         break;
1429                 case ZFCP_DOMAIN_ADDRESS:
1430                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1431                         break;
1432                 case ZFCP_FABRIC_ADDRESS:
1433                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1434                         break;
1435                 default:
1436                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1437                                       "address format\n");
1438                         continue;
1439                 }
1440                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1441                 list_for_each_entry(port, &adapter->port_list_head, list) {
1442                         if (atomic_test_mask
1443                             (ZFCP_STATUS_PORT_WKA, &port->status))
1444                                 continue;
1445                         /* Do we know this port? If not skip it. */
1446                         if (!atomic_test_mask
1447                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1448                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1449                                               "port 0x%016Lx\n", port->wwpn);
1450                                 zfcp_erp_port_reopen(port,
1451                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1452                                 continue;
1453                         }
1454
1455                         /*
1456                          * FIXME: race: d_id might being invalidated
1457                          * (...DID_DID reset)
1458                          */
1459                         if ((port->d_id & range_mask)
1460                             == (fcp_rscn_element->nport_did & range_mask)) {
1461                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1462                                                fcp_rscn_element->nport_did);
1463                                 /*
1464                                  * Unfortunately, an RSCN does not specify the
1465                                  * type of change a target underwent. We assume
1466                                  * that it makes sense to reopen the link.
1467                                  * FIXME: Shall we try to find out more about
1468                                  * the target and link state before closing it?
1469                                  * How to accomplish this? (nameserver?)
1470                                  * Where would such code be put in?
1471                                  * (inside or outside erp)
1472                                  */
1473                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1474                                               "port 0x%016Lx\n", port->wwpn);
1475                                 zfcp_test_link(port);
1476                         }
1477                 }
1478                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1479         }
1480 }
1481
1482 static void
1483 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1484                             struct fsf_status_read_buffer *status_buffer)
1485 {
1486         struct fsf_plogi *els_plogi;
1487         struct zfcp_port *port;
1488         unsigned long flags;
1489
1490         els_plogi = (struct fsf_plogi *) status_buffer->payload;
1491         read_lock_irqsave(&zfcp_data.config_lock, flags);
1492         list_for_each_entry(port, &adapter->port_list_head, list) {
1493                 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1494                         break;
1495         }
1496         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1497
1498         if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1499                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1500                                "with d_id 0x%08x on adapter %s\n",
1501                                status_buffer->d_id,
1502                                zfcp_get_busid_by_adapter(adapter));
1503         } else {
1504                 zfcp_erp_port_forced_reopen(port, 0);
1505         }
1506 }
1507
1508 static void
1509 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1510                            struct fsf_status_read_buffer *status_buffer)
1511 {
1512         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1513         struct zfcp_port *port;
1514         unsigned long flags;
1515
1516         read_lock_irqsave(&zfcp_data.config_lock, flags);
1517         list_for_each_entry(port, &adapter->port_list_head, list) {
1518                 if (port->wwpn == els_logo->nport_wwpn)
1519                         break;
1520         }
1521         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1522
1523         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1524                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1525                                "with d_id 0x%08x on adapter %s\n",
1526                                status_buffer->d_id,
1527                                zfcp_get_busid_by_adapter(adapter));
1528         } else {
1529                 zfcp_erp_port_forced_reopen(port, 0);
1530         }
1531 }
1532
1533 static void
1534 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1535                               struct fsf_status_read_buffer *status_buffer)
1536 {
1537         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1538                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1539                         zfcp_get_busid_by_adapter(adapter));
1540
1541 }
1542
1543 void
1544 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1545 {
1546         struct fsf_status_read_buffer *status_buffer;
1547         u32 els_type;
1548         struct zfcp_adapter *adapter;
1549
1550         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1551         els_type = *(u32 *) (status_buffer->payload);
1552         adapter = fsf_req->adapter;
1553
1554         zfcp_san_dbf_event_incoming_els(fsf_req);
1555         if (els_type == LS_PLOGI)
1556                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1557         else if (els_type == LS_LOGO)
1558                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1559         else if ((els_type & 0xffff0000) == LS_RSCN)
1560                 /* we are only concerned with the command, not the length */
1561                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1562         else
1563                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1564 }
1565
1566
1567 /**
1568  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1569  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1570  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1571  */
1572 static int
1573 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1574 {
1575         struct zfcp_gid_pn_data *data;
1576
1577         if (pool != NULL) {
1578                 data = mempool_alloc(pool, GFP_ATOMIC);
1579                 if (likely(data != NULL)) {
1580                         data->ct.pool = pool;
1581                 }
1582         } else {
1583                 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1584         }
1585
1586         if (NULL == data)
1587                 return -ENOMEM;
1588
1589         memset(data, 0, sizeof(*data));
1590         data->ct.req = &data->req;
1591         data->ct.resp = &data->resp;
1592         data->ct.req_count = data->ct.resp_count = 1;
1593         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1594         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1595         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1596         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1597
1598         *gid_pn = data;
1599         return 0;
1600 }
1601
1602 /**
1603  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1604  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1605  */
1606 static void
1607 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1608 {
1609         if ((gid_pn->ct.pool != 0))
1610                 mempool_free(gid_pn, gid_pn->ct.pool);
1611         else
1612                 kfree(gid_pn);
1613
1614         return;
1615 }
1616
1617 /**
1618  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1619  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1620  */
1621 int
1622 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1623 {
1624         int ret;
1625         struct ct_iu_gid_pn_req *ct_iu_req;
1626         struct zfcp_gid_pn_data *gid_pn;
1627         struct zfcp_adapter *adapter = erp_action->adapter;
1628
1629         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1630         if (ret < 0) {
1631                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1632                               "request failed for adapter %s\n",
1633                               zfcp_get_busid_by_adapter(adapter));
1634                 goto out;
1635         }
1636
1637         /* setup nameserver request */
1638         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1639         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1640         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1641         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1642         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1643         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1644         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1645         ct_iu_req->wwpn = erp_action->port->wwpn;
1646
1647         /* setup parameters for send generic command */
1648         gid_pn->ct.port = adapter->nameserver_port;
1649         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1650         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1651         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1652         gid_pn->port = erp_action->port;
1653
1654         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1655                                erp_action);
1656         if (ret) {
1657                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1658                               "failed for adapter %s\n",
1659                               zfcp_get_busid_by_adapter(adapter));
1660
1661                 zfcp_gid_pn_buffers_free(gid_pn);
1662         }
1663
1664  out:
1665         return ret;
1666 }
1667
1668 /**
1669  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1670  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1671  */
1672 static void zfcp_ns_gid_pn_handler(unsigned long data)
1673 {
1674         struct zfcp_port *port;
1675         struct zfcp_send_ct *ct;
1676         struct ct_iu_gid_pn_req *ct_iu_req;
1677         struct ct_iu_gid_pn_resp *ct_iu_resp;
1678         struct zfcp_gid_pn_data *gid_pn;
1679
1680
1681         gid_pn = (struct zfcp_gid_pn_data *) data;
1682         port = gid_pn->port;
1683         ct = &gid_pn->ct;
1684         ct_iu_req = zfcp_sg_to_address(ct->req);
1685         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1686
1687         if (ct->status != 0)
1688                 goto failed;
1689
1690         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1691                 /* FIXME: do we need some specific erp entry points */
1692                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1693                 goto failed;
1694         }
1695         /* paranoia */
1696         if (ct_iu_req->wwpn != port->wwpn) {
1697                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1698                                 "lookup does not match expected wwpn 0x%016Lx "
1699                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1700                                 zfcp_get_busid_by_port(port));
1701                 goto mismatch;
1702         }
1703
1704         /* looks like a valid d_id */
1705         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1706         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1707         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%08x\n",
1708                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1709         goto out;
1710
1711  mismatch:
1712         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1713         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1714                       sizeof(struct ct_iu_gid_pn_req));
1715         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1716                       sizeof(struct ct_iu_gid_pn_resp));
1717
1718  failed:
1719         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1720                         "0x%016Lx for adapter %s\n",
1721                         port->wwpn, zfcp_get_busid_by_port(port));
1722  out:
1723         zfcp_gid_pn_buffers_free(gid_pn);
1724         return;
1725 }
1726
1727 /* reject CT_IU reason codes acc. to FC-GS-4 */
1728 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1729         {0x01, "invalid command code"},
1730         {0x02, "invalid version level"},
1731         {0x03, "logical error"},
1732         {0x04, "invalid CT_IU size"},
1733         {0x05, "logical busy"},
1734         {0x07, "protocol error"},
1735         {0x09, "unable to perform command request"},
1736         {0x0b, "command not supported"},
1737         {0x0d, "server not available"},
1738         {0x0e, "session could not be established"},
1739         {0xff, "vendor specific error"},
1740         {0, NULL},
1741 };
1742
1743 /* LS_RJT reason codes acc. to FC-FS */
1744 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1745         {0x01, "invalid LS_Command code"},
1746         {0x03, "logical error"},
1747         {0x05, "logical busy"},
1748         {0x07, "protocol error"},
1749         {0x09, "unable to perform command request"},
1750         {0x0b, "command not supported"},
1751         {0x0e, "command already in progress"},
1752         {0xff, "vendor specific error"},
1753         {0, NULL},
1754 };
1755
1756 /* reject reason codes according to FC-PH/FC-FS */
1757 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1758         {0x01, "invalid D_ID"},
1759         {0x02, "invalid S_ID"},
1760         {0x03, "Nx_Port not available, temporary"},
1761         {0x04, "Nx_Port not available, permament"},
1762         {0x05, "class not supported"},
1763         {0x06, "delimiter usage error"},
1764         {0x07, "TYPE not supported"},
1765         {0x08, "invalid Link_Control"},
1766         {0x09, "invalid R_CTL field"},
1767         {0x0a, "invalid F_CTL field"},
1768         {0x0b, "invalid OX_ID"},
1769         {0x0c, "invalid RX_ID"},
1770         {0x0d, "invalid SEQ_ID"},
1771         {0x0e, "invalid DF_CTL"},
1772         {0x0f, "invalid SEQ_CNT"},
1773         {0x10, "invalid parameter field"},
1774         {0x11, "exchange error"},
1775         {0x12, "protocol error"},
1776         {0x13, "incorrect length"},
1777         {0x14, "unsupported ACK"},
1778         {0x15, "class of service not supported by entity at FFFFFE"},
1779         {0x16, "login required"},
1780         {0x17, "excessive sequences attempted"},
1781         {0x18, "unable to establish exchange"},
1782         {0x1a, "fabric path not available"},
1783         {0x1b, "invalid VC_ID (class 4)"},
1784         {0x1c, "invalid CS_CTL field"},
1785         {0x1d, "insufficient resources for VC (class 4)"},
1786         {0x1f, "invalid class of service"},
1787         {0x20, "preemption request rejected"},
1788         {0x21, "preemption not enabled"},
1789         {0x22, "multicast error"},
1790         {0x23, "multicast error terminate"},
1791         {0x24, "process login required"},
1792         {0xff, "vendor specific reject"},
1793         {0, NULL},
1794 };
1795
1796 /**
1797  * zfcp_rc_description - return description for given reaon code
1798  * @code: reason code
1799  * @rc_table: table of reason codes and descriptions
1800  */
1801 static const char *
1802 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1803 {
1804         const char *descr = "unknown reason code";
1805
1806         do {
1807                 if (code == rc_table->code) {
1808                         descr = rc_table->description;
1809                         break;
1810                 }
1811                 rc_table++;
1812         } while (rc_table->code && rc_table->description);
1813
1814         return descr;
1815 }
1816
1817 /**
1818  * zfcp_check_ct_response - evaluate reason code for CT_IU
1819  * @rjt: response payload to an CT_IU request
1820  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1821  */
1822 int
1823 zfcp_check_ct_response(struct ct_hdr *rjt)
1824 {
1825         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1826                 return 0;
1827
1828         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1829                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1830                                 "response code (0x%04hx)\n",
1831                                 rjt->cmd_rsp_code);
1832                 return 1;
1833         }
1834
1835         ZFCP_LOG_INFO("Generic Service command rejected\n");
1836         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1837                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1838                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1839                       (u32) rjt->vendor_unique);
1840
1841         return 1;
1842 }
1843
1844 /**
1845  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1846  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1847  * @rc_table: table of reason codes and descriptions
1848  */
1849 static void
1850 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1851                    const struct zfcp_rc_entry *rc_table)
1852 {
1853         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1854                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1855                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1856                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1857 }
1858
1859 /**
1860  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1861  * @sq: status qualifier word
1862  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1863  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1864  */
1865 int
1866 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1867 {
1868         int ret = -EIO;
1869
1870         if (sq == FSF_IOSTAT_NPORT_RJT) {
1871                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1872                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1873                 /* invalid d_id */
1874                 if (rjt_par->reason_code == 0x01)
1875                         ret = -EREMCHG;
1876         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1877                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1878                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1879                 /* invalid d_id */
1880                 if (rjt_par->reason_code == 0x01)
1881                         ret = -EREMCHG;
1882         } else if (sq == FSF_IOSTAT_LS_RJT) {
1883                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1884                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1885                 ret = -EREMOTEIO;
1886         } else
1887                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1888
1889         return ret;
1890 }
1891
1892 /**
1893  * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1894  * into zfcp_port structure
1895  * @port: zfcp_port structure
1896  * @plogi: plogi payload
1897  */
1898 void
1899 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1900 {
1901         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1902                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1903         if (plogi->serv_param.class1_serv_param[0] & 0x80)
1904                 port->supported_classes |= FC_COS_CLASS1;
1905         if (plogi->serv_param.class2_serv_param[0] & 0x80)
1906                 port->supported_classes |= FC_COS_CLASS2;
1907         if (plogi->serv_param.class3_serv_param[0] & 0x80)
1908                 port->supported_classes |= FC_COS_CLASS3;
1909         if (plogi->serv_param.class4_serv_param[0] & 0x80)
1910                 port->supported_classes |= FC_COS_CLASS4;
1911 }
1912
1913 #undef ZFCP_LOG_AREA