SAFE public projects git trees. - safe/jmp/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_alloc(struct zfcp_adapter *adapter)
 122 {
 123         int idx;
 124
 125         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
 126                                     GFP_KERNEL);
 127         if (!adapter->req_list)
 128                 return -ENOMEM;
 129
 130         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
 131                 INIT_LIST_HEAD(&adapter->req_list[idx]);
 132         return 0;
 133 }
 134
 135 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
 136 {
 137         kfree(adapter->req_list);
 138 }
 139
 140 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
 141 {
 142         unsigned int idx;
 143
 144         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
 145                 if (!list_empty(&adapter->req_list[idx]))
 146                         return 0;
 147         return 1;
 148 }
 149
 150 #undef ZFCP_LOG_AREA
 151
 152 /****************************************************************/
 153 /************** Uncategorised Functions *************************/
 154 /****************************************************************/
 155
 156 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 157
 158 /**
 159  * zfcp_device_setup - setup function
 160  * @str: pointer to parameter string
 161  *
 162  * Parse "device=..." parameter string.
 163  */
 164 static int __init
 165 zfcp_device_setup(char *devstr)
 166 {
 167         char *tmp, *str;
 168         size_t len;
 169
 170         if (!devstr)
 171                 return 0;
 172
 173         len = strlen(devstr) + 1;
 174         str = kmalloc(len, GFP_KERNEL);
 175         if (!str)
 176                 goto err_out;
 177         memcpy(str, devstr, len);
 178
 179         tmp = strchr(str, ',');
 180         if (!tmp)
 181                 goto err_out;
 182         *tmp++ = '\0';
 183         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 184         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 185
 186         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 187         if (*tmp++ != ',')
 188                 goto err_out;
 189         if (*tmp == '\0')
 190                 goto err_out;
 191
 192         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 193         if (*tmp != '\0')
 194                 goto err_out;
 195         kfree(str);
 196         return 1;
 197
 198  err_out:
 199         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 200         kfree(str);
 201         return 0;
 202 }
 203
 204 static void __init
 205 zfcp_init_device_configure(void)
 206 {
 207         struct zfcp_adapter *adapter;
 208         struct zfcp_port *port;
 209         struct zfcp_unit *unit;
 210
 211         down(&zfcp_data.config_sema);
 212         read_lock_irq(&zfcp_data.config_lock);
 213         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 214         if (adapter)
 215                 zfcp_adapter_get(adapter);
 216         read_unlock_irq(&zfcp_data.config_lock);
 217
 218         if (adapter == NULL)
 219                 goto out_adapter;
 220         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 221         if (!port)
 222                 goto out_port;
 223         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 224         if (!unit)
 225                 goto out_unit;
 226         up(&zfcp_data.config_sema);
 227         ccw_device_set_online(adapter->ccw_device);
 228         zfcp_erp_wait(adapter);
 229         down(&zfcp_data.config_sema);
 230         zfcp_unit_put(unit);
 231  out_unit:
 232         zfcp_port_put(port);
 233  out_port:
 234         zfcp_adapter_put(adapter);
 235  out_adapter:
 236         up(&zfcp_data.config_sema);
 237         return;
 238 }
 239
 240 static int calc_alignment(int size)
 241 {
 242         int align = 1;
 243
 244         if (!size)
 245                 return 0;
 246
 247         while ((size - align) > 0)
 248                 align <<= 1;
 249
 250         return align;
 251 }
 252
 253 static int __init
 254 zfcp_module_init(void)
 255 {
 256         int retval = -ENOMEM;
 257         int size, align;
 258
 259         size = sizeof(struct zfcp_fsf_req_qtcb);
 260         align = calc_alignment(size);
 261         zfcp_data.fsf_req_qtcb_cache =
 262                 kmem_cache_create("zfcp_fsf", size, align, 0, NULL);
 263         if (!zfcp_data.fsf_req_qtcb_cache)
 264                 goto out;
 265
 266         size = sizeof(struct fsf_status_read_buffer);
 267         align = calc_alignment(size);
 268         zfcp_data.sr_buffer_cache =
 269                 kmem_cache_create("zfcp_sr", size, align, 0, NULL);
 270         if (!zfcp_data.sr_buffer_cache)
 271                 goto out_sr_cache;
 272
 273         size = sizeof(struct zfcp_gid_pn_data);
 274         align = calc_alignment(size);
 275         zfcp_data.gid_pn_cache =
 276                 kmem_cache_create("zfcp_gid", size, align, 0, NULL);
 277         if (!zfcp_data.gid_pn_cache)
 278                 goto out_gid_cache;
 279
 280         atomic_set(&zfcp_data.loglevel, loglevel);
 281
 282         /* initialize adapter list */
 283         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 284
 285         /* initialize adapters to be removed list head */
 286         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 287
 288         zfcp_data.scsi_transport_template =
 289                 fc_attach_transport(&zfcp_transport_functions);
 290         if (!zfcp_data.scsi_transport_template)
 291                 goto out_transport;
 292
 293         retval = misc_register(&zfcp_cfdc_misc);
 294         if (retval != 0) {
 295                 ZFCP_LOG_INFO("registration of misc device "
 296                               "zfcp_cfdc failed\n");
 297                 goto out_misc;
 298         }
 299
 300         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 301                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 302
 303         /* Initialise proc semaphores */
 304         sema_init(&zfcp_data.config_sema, 1);
 305
 306         /* initialise configuration rw lock */
 307         rwlock_init(&zfcp_data.config_lock);
 308
 309         /* setup dynamic I/O */
 310         retval = zfcp_ccw_register();
 311         if (retval) {
 312                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 313                 goto out_ccw_register;
 314         }
 315
 316         if (zfcp_device_setup(device))
 317                 zfcp_init_device_configure();
 318
 319         goto out;
 320
 321  out_ccw_register:
 322         misc_deregister(&zfcp_cfdc_misc);
 323  out_misc:
 324         fc_release_transport(zfcp_data.scsi_transport_template);
 325  out_transport:
 326         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 327  out_gid_cache:
 328         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 329  out_sr_cache:
 330         kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
 331  out:
 332         return retval;
 333 }
 334
 335 /*
 336  * function:    zfcp_cfdc_dev_ioctl
 337  *
 338  * purpose:     Handle control file upload/download transaction via IOCTL
 339  *              interface
 340  *
 341  * returns:     0           - Operation completed successfuly
 342  *              -ENOTTY     - Unknown IOCTL command
 343  *              -EINVAL     - Invalid sense data record
 344  *              -ENXIO      - The FCP adapter is not available
 345  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 346  *              -ENOMEM     - Insufficient memory
 347  *              -EFAULT     - User space memory I/O operation fault
 348  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 349  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 350  */
 351 static long
 352 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 353                     unsigned long buffer)
 354 {
 355         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
 356         struct zfcp_adapter *adapter = NULL;
 357         struct zfcp_fsf_req *fsf_req = NULL;
 358         struct zfcp_sg_list *sg_list = NULL;
 359         u32 fsf_command, option;
 360         char *bus_id = NULL;
 361         int retval = 0;
 362
 363         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
 364         if (sense_data == NULL) {
 365                 retval = -ENOMEM;
 366                 goto out;
 367         }
 368
 369         sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 370         if (sg_list == NULL) {
 371                 retval = -ENOMEM;
 372                 goto out;
 373         }
 374
 375         if (command != ZFCP_CFDC_IOC) {
 376                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 377                 retval = -ENOTTY;
 378                 goto out;
 379         }
 380
 381         if ((sense_data_user = (void __user *) buffer) == NULL) {
 382                 ZFCP_LOG_INFO("sense data record is required\n");
 383                 retval = -EINVAL;
 384                 goto out;
 385         }
 386
 387         retval = copy_from_user(sense_data, sense_data_user,
 388                                 sizeof(struct zfcp_cfdc_sense_data));
 389         if (retval) {
 390                 retval = -EFAULT;
 391                 goto out;
 392         }
 393
 394         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
 395                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 396                               ZFCP_CFDC_SIGNATURE);
 397                 retval = -EINVAL;
 398                 goto out;
 399         }
 400
 401         switch (sense_data->command) {
 402
 403         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 404                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 405                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 406                 break;
 407
 408         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 409                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 410                 option = FSF_CFDC_OPTION_FORCE;
 411                 break;
 412
 413         case ZFCP_CFDC_CMND_FULL_ACCESS:
 414                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 415                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 416                 break;
 417
 418         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 419                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 420                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 421                 break;
 422
 423         case ZFCP_CFDC_CMND_UPLOAD:
 424                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 425                 option = 0;
 426                 break;
 427
 428         default:
 429                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 430                               sense_data->command);
 431                 retval = -EINVAL;
 432                 goto out;
 433         }
 434
 435         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 436         if (bus_id == NULL) {
 437                 retval = -ENOMEM;
 438                 goto out;
 439         }
 440         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 441                 (sense_data->devno >> 24),
 442                 (sense_data->devno >> 16) & 0xFF,
 443                 (sense_data->devno & 0xFFFF));
 444
 445         read_lock_irq(&zfcp_data.config_lock);
 446         adapter = zfcp_get_adapter_by_busid(bus_id);
 447         if (adapter)
 448                 zfcp_adapter_get(adapter);
 449         read_unlock_irq(&zfcp_data.config_lock);
 450
 451         kfree(bus_id);
 452
 453         if (adapter == NULL) {
 454                 ZFCP_LOG_INFO("invalid adapter\n");
 455                 retval = -ENXIO;
 456                 goto out;
 457         }
 458
 459         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 460                 retval = zfcp_sg_list_alloc(sg_list,
 461                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 462                 if (retval) {
 463                         retval = -ENOMEM;
 464                         goto out;
 465                 }
 466         }
 467
 468         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
 469             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 470                 retval = zfcp_sg_list_copy_from_user(
 471                         sg_list, &sense_data_user->control_file,
 472                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 473                 if (retval) {
 474                         retval = -EFAULT;
 475                         goto out;
 476                 }
 477         }
 478
 479         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
 480                                        option, sg_list);
 481         if (retval)
 482                 goto out;
 483
 484         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 485             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 486                 retval = -ENXIO;
 487                 goto out;
 488         }
 489
 490         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
 491         memcpy(&sense_data->fsf_status_qual,
 492                &fsf_req->qtcb->header.fsf_status_qual,
 493                sizeof(union fsf_status_qual));
 494         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
 495
 496         retval = copy_to_user(sense_data_user, sense_data,
 497                 sizeof(struct zfcp_cfdc_sense_data));
 498         if (retval) {
 499                 retval = -EFAULT;
 500                 goto out;
 501         }
 502
 503         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
 504                 retval = zfcp_sg_list_copy_to_user(
 505                         &sense_data_user->control_file, sg_list,
 506                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 507                 if (retval) {
 508                         retval = -EFAULT;
 509                         goto out;
 510                 }
 511         }
 512
 513  out:
 514         if (fsf_req != NULL)
 515                 zfcp_fsf_req_free(fsf_req);
 516
 517         if ((adapter != NULL) && (retval != -ENXIO))
 518                 zfcp_adapter_put(adapter);
 519
 520         if (sg_list != NULL) {
 521                 zfcp_sg_list_free(sg_list);
 522                 kfree(sg_list);
 523         }
 524
 525         kfree(sense_data);
 526
 527         return retval;
 528 }
 529
 530
 531 /**
 532  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 533  * @sg_list: structure describing a scatter gather list
 534  * @size: size of scatter-gather list
 535  * Return: 0 on success, else -ENOMEM
 536  *
 537  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 538  * or NULL if we run out of memory. sg_list->count specifies the number of
 539  * elements of the scatter-gather list. The maximum size of a single element
 540  * in the scatter-gather list is PAGE_SIZE.
 541  */
 542 static int
 543 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 544 {
 545         struct scatterlist *sg;
 546         unsigned int i;
 547         int retval = 0;
 548         void *address;
 549
 550         BUG_ON(sg_list == NULL);
 551
 552         sg_list->count = size >> PAGE_SHIFT;
 553         if (size & ~PAGE_MASK)
 554                 sg_list->count++;
 555         sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
 556                               GFP_KERNEL);
 557         if (sg_list->sg == NULL) {
 558                 sg_list->count = 0;
 559                 retval = -ENOMEM;
 560                 goto out;
 561         }
 562         sg_init_table(sg_list->sg, sg_list->count);
 563
 564         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 565                 address = (void *) get_zeroed_page(GFP_KERNEL);
 566                 if (address == NULL) {
 567                         sg_list->count = i;
 568                         zfcp_sg_list_free(sg_list);
 569                         retval = -ENOMEM;
 570                         goto out;
 571                 }
 572                 zfcp_address_to_sg(address, sg, min(size, PAGE_SIZE));
 573                 size -= sg->length;
 574         }
 575
 576  out:
 577         return retval;
 578 }
 579
 580
 581 /**
 582  * zfcp_sg_list_free - free memory of a scatter-gather list
 583  * @sg_list: structure describing a scatter-gather list
 584  *
 585  * Memory for each element in the scatter-gather list is freed.
 586  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 587  */
 588 static void
 589 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 590 {
 591         struct scatterlist *sg;
 592         unsigned int i;
 593
 594         BUG_ON(sg_list == NULL);
 595
 596         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 597                 free_page((unsigned long) zfcp_sg_to_address(sg));
 598
 599         sg_list->count = 0;
 600         kfree(sg_list->sg);
 601 }
 602
 603 /**
 604  * zfcp_sg_size - determine size of a scatter-gather list
 605  * @sg: array of (struct scatterlist)
 606  * @sg_count: elements in array
 607  * Return: size of entire scatter-gather list
 608  */
 609 static size_t zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 610 {
 611         unsigned int i;
 612         struct scatterlist *p;
 613         size_t size;
 614
 615         size = 0;
 616         for (i = 0, p = sg; i < sg_count; i++, p++) {
 617                 BUG_ON(p == NULL);
 618                 size += p->length;
 619         }
 620
 621         return size;
 622 }
 623
 624
 625 /**
 626  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 627  * @sg_list: structure describing a scatter-gather list
 628  * @user_buffer: pointer to buffer in user space
 629  * @size: number of bytes to be copied
 630  * Return: 0 on success, -EFAULT if copy_from_user fails.
 631  */
 632 static int
 633 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 634                             void __user *user_buffer,
 635                             size_t size)
 636 {
 637         struct scatterlist *sg;
 638         unsigned int length;
 639         void *zfcp_buffer;
 640         int retval = 0;
 641
 642         BUG_ON(sg_list == NULL);
 643
 644         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 645                 return -EFAULT;
 646
 647         for (sg = sg_list->sg; size > 0; sg++) {
 648                 length = min((unsigned int)size, sg->length);
 649                 zfcp_buffer = zfcp_sg_to_address(sg);
 650                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 651                         retval = -EFAULT;
 652                         goto out;
 653                 }
 654                 user_buffer += length;
 655                 size -= length;
 656         }
 657
 658  out:
 659         return retval;
 660 }
 661
 662
 663 /**
 664  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 665  * @user_buffer: pointer to buffer in user space
 666  * @sg_list: structure describing a scatter-gather list
 667  * @size: number of bytes to be copied
 668  * Return: 0 on success, -EFAULT if copy_to_user fails
 669  */
 670 static int
 671 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 672                           struct zfcp_sg_list *sg_list,
 673                           size_t size)
 674 {
 675         struct scatterlist *sg;
 676         unsigned int length;
 677         void *zfcp_buffer;
 678         int retval = 0;
 679
 680         BUG_ON(sg_list == NULL);
 681
 682         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 683                 return -EFAULT;
 684
 685         for (sg = sg_list->sg; size > 0; sg++) {
 686                 length = min((unsigned int) size, sg->length);
 687                 zfcp_buffer = zfcp_sg_to_address(sg);
 688                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 689                         retval = -EFAULT;
 690                         goto out;
 691                 }
 692                 user_buffer += length;
 693                 size -= length;
 694         }
 695
 696  out:
 697         return retval;
 698 }
 699
 700
 701 #undef ZFCP_LOG_AREA
 702
 703 /****************************************************************/
 704 /****** Functions for configuration/set-up of structures ********/
 705 /****************************************************************/
 706
 707 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 708
 709 /**
 710  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 711  * @port: pointer to port to search for unit
 712  * @fcp_lun: FCP LUN to search for
 713  * Traverse list of all units of a port and return pointer to a unit
 714  * with the given FCP LUN.
 715  */
 716 struct zfcp_unit *
 717 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 718 {
 719         struct zfcp_unit *unit;
 720         int found = 0;
 721
 722         list_for_each_entry(unit, &port->unit_list_head, list) {
 723                 if ((unit->fcp_lun == fcp_lun) &&
 724                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 725                 {
 726                         found = 1;
 727                         break;
 728                 }
 729         }
 730         return found ? unit : NULL;
 731 }
 732
 733 /**
 734  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 735  * @adapter: pointer to adapter to search for port
 736  * @wwpn: wwpn to search for
 737  * Traverse list of all ports of an adapter and return pointer to a port
 738  * with the given wwpn.
 739  */
 740 struct zfcp_port *
 741 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 742 {
 743         struct zfcp_port *port;
 744         int found = 0;
 745
 746         list_for_each_entry(port, &adapter->port_list_head, list) {
 747                 if ((port->wwpn == wwpn) &&
 748                     !(atomic_read(&port->status) &
 749                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 750                         found = 1;
 751                         break;
 752                 }
 753         }
 754         return found ? port : NULL;
 755 }
 756
 757 /**
 758  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 759  * @adapter: pointer to adapter to search for port
 760  * @d_id: d_id to search for
 761  * Traverse list of all ports of an adapter and return pointer to a port
 762  * with the given d_id.
 763  */
 764 struct zfcp_port *
 765 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 766 {
 767         struct zfcp_port *port;
 768         int found = 0;
 769
 770         list_for_each_entry(port, &adapter->port_list_head, list) {
 771                 if ((port->d_id == d_id) &&
 772                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 773                 {
 774                         found = 1;
 775                         break;
 776                 }
 777         }
 778         return found ? port : NULL;
 779 }
 780
 781 /**
 782  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 783  * @bus_id: bus_id to search for
 784  * Traverse list of all adapters and return pointer to an adapter
 785  * with the given bus_id.
 786  */
 787 struct zfcp_adapter *
 788 zfcp_get_adapter_by_busid(char *bus_id)
 789 {
 790         struct zfcp_adapter *adapter;
 791         int found = 0;
 792
 793         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 794                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 795                              BUS_ID_SIZE) == 0) &&
 796                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 797                                       &adapter->status)){
 798                         found = 1;
 799                         break;
 800                 }
 801         }
 802         return found ? adapter : NULL;
 803 }
 804
 805 /**
 806  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 807  * @port: pointer to port where unit is added
 808  * @fcp_lun: FCP LUN of unit to be enqueued
 809  * Return: pointer to enqueued unit on success, NULL on error
 810  * Locks: config_sema must be held to serialize changes to the unit list
 811  *
 812  * Sets up some unit internal structures and creates sysfs entry.
 813  */
 814 struct zfcp_unit *
 815 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 816 {
 817         struct zfcp_unit *unit;
 818
 819         /*
 820          * check that there is no unit with this FCP_LUN already in list
 821          * and enqueue it.
 822          * Note: Unlike for the adapter and the port, this is an error
 823          */
 824         read_lock_irq(&zfcp_data.config_lock);
 825         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 826         read_unlock_irq(&zfcp_data.config_lock);
 827         if (unit)
 828                 return NULL;
 829
 830         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 831         if (!unit)
 832                 return NULL;
 833
 834         /* initialise reference count stuff */
 835         atomic_set(&unit->refcount, 0);
 836         init_waitqueue_head(&unit->remove_wq);
 837
 838         unit->port = port;
 839         unit->fcp_lun = fcp_lun;
 840
 841         /* setup for sysfs registration */
 842         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 843         unit->sysfs_device.parent = &port->sysfs_device;
 844         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 845         dev_set_drvdata(&unit->sysfs_device, unit);
 846
 847         /* mark unit unusable as long as sysfs registration is not complete */
 848         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 849
 850         spin_lock_init(&unit->latencies.lock);
 851         unit->latencies.write.channel.min = 0xFFFFFFFF;
 852         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 853         unit->latencies.read.channel.min = 0xFFFFFFFF;
 854         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 855         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 856         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 857
 858         if (device_register(&unit->sysfs_device)) {
 859                 kfree(unit);
 860                 return NULL;
 861         }
 862
 863         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 864                 device_unregister(&unit->sysfs_device);
 865                 return NULL;
 866         }
 867
 868         zfcp_unit_get(unit);
 869         unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
 870
 871         write_lock_irq(&zfcp_data.config_lock);
 872         list_add_tail(&unit->list, &port->unit_list_head);
 873         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 874         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 875         write_unlock_irq(&zfcp_data.config_lock);
 876
 877         port->units++;
 878         zfcp_port_get(port);
 879
 880         return unit;
 881 }
 882
 883 void
 884 zfcp_unit_dequeue(struct zfcp_unit *unit)
 885 {
 886         zfcp_unit_wait(unit);
 887         write_lock_irq(&zfcp_data.config_lock);
 888         list_del(&unit->list);
 889         write_unlock_irq(&zfcp_data.config_lock);
 890         unit->port->units--;
 891         zfcp_port_put(unit->port);
 892         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 893         device_unregister(&unit->sysfs_device);
 894 }
 895
 896 /*
 897  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 898  * commands.
 899  * It also genrates fcp-nameserver request/response buffer and unsolicited
 900  * status read fsf_req buffers.
 901  *
 902  * locks:       must only be called with zfcp_data.config_sema taken
 903  */
 904 static int
 905 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 906 {
 907         adapter->pool.fsf_req_erp =
 908                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 909                                          zfcp_data.fsf_req_qtcb_cache);
 910         if (!adapter->pool.fsf_req_erp)
 911                 return -ENOMEM;
 912
 913         adapter->pool.fsf_req_scsi =
 914                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 915                                          zfcp_data.fsf_req_qtcb_cache);
 916         if (!adapter->pool.fsf_req_scsi)
 917                 return -ENOMEM;
 918
 919         adapter->pool.fsf_req_abort =
 920                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 921                                          zfcp_data.fsf_req_qtcb_cache);
 922         if (!adapter->pool.fsf_req_abort)
 923                 return -ENOMEM;
 924
 925         adapter->pool.fsf_req_status_read =
 926                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 927                                             sizeof(struct zfcp_fsf_req));
 928         if (!adapter->pool.fsf_req_status_read)
 929                 return -ENOMEM;
 930
 931         adapter->pool.data_status_read =
 932                 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
 933                                          zfcp_data.sr_buffer_cache);
 934         if (!adapter->pool.data_status_read)
 935                 return -ENOMEM;
 936
 937         adapter->pool.data_gid_pn =
 938                 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
 939                                          zfcp_data.gid_pn_cache);
 940         if (!adapter->pool.data_gid_pn)
 941                 return -ENOMEM;
 942
 943         return 0;
 944 }
 945
 946 /**
 947  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 948  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 949  * locking:  zfcp_data.config_sema must be held
 950  */
 951 static void
 952 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 953 {
 954         if (adapter->pool.fsf_req_erp)
 955                 mempool_destroy(adapter->pool.fsf_req_erp);
 956         if (adapter->pool.fsf_req_scsi)
 957                 mempool_destroy(adapter->pool.fsf_req_scsi);
 958         if (adapter->pool.fsf_req_abort)
 959                 mempool_destroy(adapter->pool.fsf_req_abort);
 960         if (adapter->pool.fsf_req_status_read)
 961                 mempool_destroy(adapter->pool.fsf_req_status_read);
 962         if (adapter->pool.data_status_read)
 963                 mempool_destroy(adapter->pool.data_status_read);
 964         if (adapter->pool.data_gid_pn)
 965                 mempool_destroy(adapter->pool.data_gid_pn);
 966 }
 967
 968 static void zfcp_dummy_release(struct device *dev)
 969 {
 970         return;
 971 }
 972
 973 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 974 {
 975         while (atomic_read(&adapter->stat_miss) > 0)
 976                 if (zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL))
 977                         break;
 978         else
 979                 atomic_dec(&adapter->stat_miss);
 980
 981         if (ZFCP_STATUS_READS_RECOM <= atomic_read(&adapter->stat_miss)) {
 982                 zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
 983                 return 1;
 984         }
 985         return 0;
 986 }
 987
 988 static void _zfcp_status_read_scheduler(struct work_struct *work)
 989 {
 990         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 991                                              stat_work));
 992 }
 993
 994 /*
 995  * Enqueues an adapter at the end of the adapter list in the driver data.
 996  * All adapter internal structures are set up.
 997  * Proc-fs entries are also created.
 998  *
 999  * returns:     0             if a new adapter was successfully enqueued
1000  *              ZFCP_KNOWN    if an adapter with this devno was already present
1001  *              -ENOMEM       if alloc failed
1002  * locks:       config_sema must be held to serialise changes to the adapter list
1003  */
1004 struct zfcp_adapter *
1005 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1006 {
1007         int retval = 0;
1008         struct zfcp_adapter *adapter;
1009
1010         /*
1011          * Note: It is safe to release the list_lock, as any list changes
1012          * are protected by the config_sema, which must be held to get here
1013          */
1014
1015         /* try to allocate new adapter data structure (zeroed) */
1016         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1017         if (!adapter) {
1018                 ZFCP_LOG_INFO("error: allocation of base adapter "
1019                               "structure failed\n");
1020                 goto out;
1021         }
1022
1023         ccw_device->handler = NULL;
1024
1025         /* save ccw_device pointer */
1026         adapter->ccw_device = ccw_device;
1027
1028         retval = zfcp_qdio_allocate_queues(adapter);
1029         if (retval)
1030                 goto queues_alloc_failed;
1031
1032         retval = zfcp_qdio_allocate(adapter);
1033         if (retval)
1034                 goto qdio_allocate_failed;
1035
1036         retval = zfcp_allocate_low_mem_buffers(adapter);
1037         if (retval) {
1038                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1039                 goto failed_low_mem_buffers;
1040         }
1041
1042         /* initialise reference count stuff */
1043         atomic_set(&adapter->refcount, 0);
1044         init_waitqueue_head(&adapter->remove_wq);
1045
1046         /* initialise list of ports */
1047         INIT_LIST_HEAD(&adapter->port_list_head);
1048
1049         /* initialise list of ports to be removed */
1050         INIT_LIST_HEAD(&adapter->port_remove_lh);
1051
1052         /* initialize list of fsf requests */
1053         spin_lock_init(&adapter->req_list_lock);
1054         retval = zfcp_reqlist_alloc(adapter);
1055         if (retval) {
1056                 ZFCP_LOG_INFO("request list initialization failed\n");
1057                 goto failed_low_mem_buffers;
1058         }
1059
1060         /* initialize debug locks */
1061
1062         spin_lock_init(&adapter->hba_dbf_lock);
1063         spin_lock_init(&adapter->san_dbf_lock);
1064         spin_lock_init(&adapter->scsi_dbf_lock);
1065         spin_lock_init(&adapter->rec_dbf_lock);
1066
1067         retval = zfcp_adapter_debug_register(adapter);
1068         if (retval)
1069                 goto debug_register_failed;
1070
1071         /* initialize error recovery stuff */
1072
1073         rwlock_init(&adapter->erp_lock);
1074         sema_init(&adapter->erp_ready_sem, 0);
1075         INIT_LIST_HEAD(&adapter->erp_ready_head);
1076         INIT_LIST_HEAD(&adapter->erp_running_head);
1077
1078         /* initialize abort lock */
1079         rwlock_init(&adapter->abort_lock);
1080
1081         /* initialise some erp stuff */
1082         init_waitqueue_head(&adapter->erp_thread_wqh);
1083         init_waitqueue_head(&adapter->erp_done_wqh);
1084
1085         /* initialize lock of associated request queue */
1086         rwlock_init(&adapter->request_queue.queue_lock);
1087         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
1088
1089         /* mark adapter unusable as long as sysfs registration is not complete */
1090         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1091
1092         dev_set_drvdata(&ccw_device->dev, adapter);
1093
1094         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1095                 goto sysfs_failed;
1096
1097         adapter->generic_services.parent = &adapter->ccw_device->dev;
1098         adapter->generic_services.release = zfcp_dummy_release;
1099         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1100                  "generic_services");
1101
1102         if (device_register(&adapter->generic_services))
1103                 goto generic_services_failed;
1104
1105         /* put allocated adapter at list tail */
1106         write_lock_irq(&zfcp_data.config_lock);
1107         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1108         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1109         write_unlock_irq(&zfcp_data.config_lock);
1110
1111         zfcp_data.adapters++;
1112
1113         goto out;
1114
1115  generic_services_failed:
1116         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1117  sysfs_failed:
1118         zfcp_adapter_debug_unregister(adapter);
1119  debug_register_failed:
1120         dev_set_drvdata(&ccw_device->dev, NULL);
1121         zfcp_reqlist_free(adapter);
1122  failed_low_mem_buffers:
1123         zfcp_free_low_mem_buffers(adapter);
1124         if (qdio_free(ccw_device) != 0)
1125                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1126                                 zfcp_get_busid_by_adapter(adapter));
1127  qdio_allocate_failed:
1128         zfcp_qdio_free_queues(adapter);
1129  queues_alloc_failed:
1130         kfree(adapter);
1131         adapter = NULL;
1132  out:
1133         return adapter;
1134 }
1135
1136 /*
1137  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1138  *              !0 - struct zfcp_adapter  data structure could not be removed
1139  *                      (e.g. still used)
1140  * locks:       adapter list write lock is assumed to be held by caller
1141  */
1142 void
1143 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1144 {
1145         int retval = 0;
1146         unsigned long flags;
1147
1148         cancel_work_sync(&adapter->stat_work);
1149         zfcp_adapter_scsi_unregister(adapter);
1150         device_unregister(&adapter->generic_services);
1151         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1152         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1153         /* sanity check: no pending FSF requests */
1154         spin_lock_irqsave(&adapter->req_list_lock, flags);
1155         retval = zfcp_reqlist_isempty(adapter);
1156         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1157         if (!retval) {
1158                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1159                                 "%i requests outstanding\n",
1160                                 zfcp_get_busid_by_adapter(adapter), adapter,
1161                                 atomic_read(&adapter->reqs_active));
1162                 retval = -EBUSY;
1163                 goto out;
1164         }
1165
1166         zfcp_adapter_debug_unregister(adapter);
1167
1168         /* remove specified adapter data structure from list */
1169         write_lock_irq(&zfcp_data.config_lock);
1170         list_del(&adapter->list);
1171         write_unlock_irq(&zfcp_data.config_lock);
1172
1173         /* decrease number of adapters in list */
1174         zfcp_data.adapters--;
1175
1176         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1177                        "%i adapters still in list\n",
1178                        zfcp_get_busid_by_adapter(adapter),
1179                        adapter, zfcp_data.adapters);
1180
1181         retval = qdio_free(adapter->ccw_device);
1182         if (retval)
1183                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1184                                 zfcp_get_busid_by_adapter(adapter));
1185
1186         zfcp_free_low_mem_buffers(adapter);
1187         /* free memory of adapter data structure and queues */
1188         zfcp_qdio_free_queues(adapter);
1189         zfcp_reqlist_free(adapter);
1190         kfree(adapter->fc_stats);
1191         kfree(adapter->stats_reset_data);
1192         ZFCP_LOG_TRACE("freeing adapter structure\n");
1193         kfree(adapter);
1194  out:
1195         return;
1196 }
1197
1198 /**
1199  * zfcp_port_enqueue - enqueue port to port list of adapter
1200  * @adapter: adapter where remote port is added
1201  * @wwpn: WWPN of the remote port to be enqueued
1202  * @status: initial status for the port
1203  * @d_id: destination id of the remote port to be enqueued
1204  * Return: pointer to enqueued port on success, NULL on error
1205  * Locks: config_sema must be held to serialize changes to the port list
1206  *
1207  * All port internal structures are set up and the sysfs entry is generated.
1208  * d_id is used to enqueue ports with a well known address like the Directory
1209  * Service for nameserver lookup.
1210  */
1211 struct zfcp_port *
1212 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1213                   u32 d_id)
1214 {
1215         struct zfcp_port *port;
1216         int check_wwpn;
1217
1218         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1219         /*
1220          * check that there is no port with this WWPN already in list
1221          */
1222         if (check_wwpn) {
1223                 read_lock_irq(&zfcp_data.config_lock);
1224                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1225                 read_unlock_irq(&zfcp_data.config_lock);
1226                 if (port)
1227                         return NULL;
1228         }
1229
1230         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1231         if (!port)
1232                 return NULL;
1233
1234         /* initialise reference count stuff */
1235         atomic_set(&port->refcount, 0);
1236         init_waitqueue_head(&port->remove_wq);
1237
1238         INIT_LIST_HEAD(&port->unit_list_head);
1239         INIT_LIST_HEAD(&port->unit_remove_lh);
1240
1241         port->adapter = adapter;
1242
1243         if (check_wwpn)
1244                 port->wwpn = wwpn;
1245
1246         atomic_set_mask(status, &port->status);
1247
1248         /* setup for sysfs registration */
1249         if (status & ZFCP_STATUS_PORT_WKA) {
1250                 switch (d_id) {
1251                 case ZFCP_DID_DIRECTORY_SERVICE:
1252                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1253                                  "directory");
1254                         break;
1255                 case ZFCP_DID_MANAGEMENT_SERVICE:
1256                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1257                                  "management");
1258                         break;
1259                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1260                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1261                                  "key_distribution");
1262                         break;
1263                 case ZFCP_DID_ALIAS_SERVICE:
1264                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1265                                  "alias");
1266                         break;
1267                 case ZFCP_DID_TIME_SERVICE:
1268                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1269                                  "time");
1270                         break;
1271                 default:
1272                         kfree(port);
1273                         return NULL;
1274                 }
1275                 port->d_id = d_id;
1276                 port->sysfs_device.parent = &adapter->generic_services;
1277         } else {
1278                 snprintf(port->sysfs_device.bus_id,
1279                          BUS_ID_SIZE, "0x%016llx", wwpn);
1280                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1281         }
1282         port->sysfs_device.release = zfcp_sysfs_port_release;
1283         dev_set_drvdata(&port->sysfs_device, port);
1284
1285         /* mark port unusable as long as sysfs registration is not complete */
1286         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1287
1288         if (device_register(&port->sysfs_device)) {
1289                 kfree(port);
1290                 return NULL;
1291         }
1292
1293         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1294                 device_unregister(&port->sysfs_device);
1295                 return NULL;
1296         }
1297
1298         zfcp_port_get(port);
1299
1300         write_lock_irq(&zfcp_data.config_lock);
1301         list_add_tail(&port->list, &adapter->port_list_head);
1302         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1303         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1304         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1305                 if (!adapter->nameserver_port)
1306                         adapter->nameserver_port = port;
1307         adapter->ports++;
1308         write_unlock_irq(&zfcp_data.config_lock);
1309
1310         zfcp_adapter_get(adapter);
1311
1312         return port;
1313 }
1314
1315 void
1316 zfcp_port_dequeue(struct zfcp_port *port)
1317 {
1318         zfcp_port_wait(port);
1319         write_lock_irq(&zfcp_data.config_lock);
1320         list_del(&port->list);
1321         port->adapter->ports--;
1322         write_unlock_irq(&zfcp_data.config_lock);
1323         if (port->rport)
1324                 fc_remote_port_delete(port->rport);
1325         port->rport = NULL;
1326         zfcp_adapter_put(port->adapter);
1327         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1328                                      atomic_read(&port->status));
1329         device_unregister(&port->sysfs_device);
1330 }
1331
1332 /* Enqueues a nameserver port */
1333 int
1334 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1335 {
1336         struct zfcp_port *port;
1337
1338         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1339                                  ZFCP_DID_DIRECTORY_SERVICE);
1340         if (!port) {
1341                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1342                               "adapter %s failed\n",
1343                               zfcp_get_busid_by_adapter(adapter));
1344                 return -ENXIO;
1345         }
1346         zfcp_port_put(port);
1347
1348         return 0;
1349 }
1350
1351 #undef ZFCP_LOG_AREA
1352
1353 /****************************************************************/
1354 /******* Fibre Channel Standard related Functions  **************/
1355 /****************************************************************/
1356
1357 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1358
1359 static void zfcp_fsf_incoming_els_rscn(struct zfcp_fsf_req *fsf_req)
1360 {
1361         struct fsf_status_read_buffer *status_buffer = (void*)fsf_req->data;
1362         struct zfcp_adapter *adapter = fsf_req->adapter;
1363         struct fcp_rscn_head *fcp_rscn_head;
1364         struct fcp_rscn_element *fcp_rscn_element;
1365         struct zfcp_port *port;
1366         u16 i;
1367         u16 no_entries;
1368         u32 range_mask;
1369         unsigned long flags;
1370
1371         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1372         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1373
1374         /* see FC-FS */
1375         no_entries = (fcp_rscn_head->payload_len / 4);
1376
1377         for (i = 1; i < no_entries; i++) {
1378                 /* skip head and start with 1st element */
1379                 fcp_rscn_element++;
1380                 switch (fcp_rscn_element->addr_format) {
1381                 case ZFCP_PORT_ADDRESS:
1382                         range_mask = ZFCP_PORTS_RANGE_PORT;
1383                         break;
1384                 case ZFCP_AREA_ADDRESS:
1385                         range_mask = ZFCP_PORTS_RANGE_AREA;
1386                         break;
1387                 case ZFCP_DOMAIN_ADDRESS:
1388                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1389                         break;
1390                 case ZFCP_FABRIC_ADDRESS:
1391                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1392                         break;
1393                 default:
1394                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1395                                       "address format\n");
1396                         continue;
1397                 }
1398                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1399                 list_for_each_entry(port, &adapter->port_list_head, list) {
1400                         if (atomic_test_mask
1401                             (ZFCP_STATUS_PORT_WKA, &port->status))
1402                                 continue;
1403                         /* Do we know this port? If not skip it. */
1404                         if (!atomic_test_mask
1405                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1406                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1407                                               "port 0x%016Lx\n", port->wwpn);
1408                                 zfcp_erp_port_reopen(port,
1409                                                      ZFCP_STATUS_COMMON_ERP_FAILED,
1410                                                      82, fsf_req);
1411                                 continue;
1412                         }
1413
1414                         /*
1415                          * FIXME: race: d_id might being invalidated
1416                          * (...DID_DID reset)
1417                          */
1418                         if ((port->d_id & range_mask)
1419                             == (fcp_rscn_element->nport_did & range_mask)) {
1420                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1421                                                fcp_rscn_element->nport_did);
1422                                 /*
1423                                  * Unfortunately, an RSCN does not specify the
1424                                  * type of change a target underwent. We assume
1425                                  * that it makes sense to reopen the link.
1426                                  * FIXME: Shall we try to find out more about
1427                                  * the target and link state before closing it?
1428                                  * How to accomplish this? (nameserver?)
1429                                  * Where would such code be put in?
1430                                  * (inside or outside erp)
1431                                  */
1432                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1433                                               "port 0x%016Lx\n", port->wwpn);
1434                                 zfcp_test_link(port);
1435                         }
1436                 }
1437                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1438         }
1439 }
1440
1441 static void zfcp_fsf_incoming_els_plogi(struct zfcp_fsf_req *fsf_req)
1442 {
1443         struct fsf_status_read_buffer *status_buffer = (void*)fsf_req->data;
1444         struct zfcp_adapter *adapter = fsf_req->adapter;
1445         struct fsf_plogi *els_plogi;
1446         struct zfcp_port *port;
1447         unsigned long flags;
1448
1449         els_plogi = (struct fsf_plogi *) status_buffer->payload;
1450         read_lock_irqsave(&zfcp_data.config_lock, flags);
1451         list_for_each_entry(port, &adapter->port_list_head, list) {
1452                 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1453                         break;
1454         }
1455         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1456
1457         if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1458                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1459                                "with d_id 0x%06x on adapter %s\n",
1460                                status_buffer->d_id,
1461                                zfcp_get_busid_by_adapter(adapter));
1462         } else {
1463                 zfcp_erp_port_forced_reopen(port, 0, 83, fsf_req);
1464         }
1465 }
1466
1467 static void zfcp_fsf_incoming_els_logo(struct zfcp_fsf_req *fsf_req)
1468 {
1469         struct fsf_status_read_buffer *status_buffer = (void*)fsf_req->data;
1470         struct zfcp_adapter *adapter = fsf_req->adapter;
1471         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1472         struct zfcp_port *port;
1473         unsigned long flags;
1474
1475         read_lock_irqsave(&zfcp_data.config_lock, flags);
1476         list_for_each_entry(port, &adapter->port_list_head, list) {
1477                 if (port->wwpn == els_logo->nport_wwpn)
1478                         break;
1479         }
1480         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1481
1482         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1483                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1484                                "with d_id 0x%06x on adapter %s\n",
1485                                status_buffer->d_id,
1486                                zfcp_get_busid_by_adapter(adapter));
1487         } else {
1488                 zfcp_erp_port_forced_reopen(port, 0, 84, fsf_req);
1489         }
1490 }
1491
1492 static void
1493 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1494                               struct fsf_status_read_buffer *status_buffer)
1495 {
1496         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1497                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1498                         zfcp_get_busid_by_adapter(adapter));
1499
1500 }
1501
1502 void
1503 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1504 {
1505         struct fsf_status_read_buffer *status_buffer;
1506         u32 els_type;
1507         struct zfcp_adapter *adapter;
1508
1509         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1510         els_type = *(u32 *) (status_buffer->payload);
1511         adapter = fsf_req->adapter;
1512
1513         zfcp_san_dbf_event_incoming_els(fsf_req);
1514         if (els_type == LS_PLOGI)
1515                 zfcp_fsf_incoming_els_plogi(fsf_req);
1516         else if (els_type == LS_LOGO)
1517                 zfcp_fsf_incoming_els_logo(fsf_req);
1518         else if ((els_type & 0xffff0000) == LS_RSCN)
1519                 /* we are only concerned with the command, not the length */
1520                 zfcp_fsf_incoming_els_rscn(fsf_req);
1521         else
1522                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1523 }
1524
1525
1526 /**
1527  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1528  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1529  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1530  */
1531 static int
1532 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1533 {
1534         struct zfcp_gid_pn_data *data;
1535
1536         if (pool)
1537                 data = mempool_alloc(pool, GFP_ATOMIC);
1538         else
1539                 data = kmem_cache_alloc(zfcp_data.gid_pn_cache, GFP_ATOMIC);
1540
1541         if (NULL == data)
1542                 return -ENOMEM;
1543
1544         memset(data, 0, sizeof(*data));
1545         data->ct.pool = pool;
1546         sg_init_table(&data->req , 1);
1547         sg_init_table(&data->resp , 1);
1548         data->ct.req = &data->req;
1549         data->ct.resp = &data->resp;
1550         data->ct.req_count = data->ct.resp_count = 1;
1551         zfcp_address_to_sg(&data->ct_iu_req, &data->req, sizeof(struct ct_iu_gid_pn_req));
1552         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp, sizeof(struct ct_iu_gid_pn_resp));
1553
1554         *gid_pn = data;
1555         return 0;
1556 }
1557
1558 /**
1559  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1560  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1561  */
1562 static void zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1563 {
1564         if (gid_pn->ct.pool)
1565                 mempool_free(gid_pn, gid_pn->ct.pool);
1566         else
1567                 kmem_cache_free(zfcp_data.gid_pn_cache, gid_pn);
1568 }
1569
1570 /**
1571  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1572  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1573  */
1574 int
1575 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1576 {
1577         int ret;
1578         struct ct_iu_gid_pn_req *ct_iu_req;
1579         struct zfcp_gid_pn_data *gid_pn;
1580         struct zfcp_adapter *adapter = erp_action->adapter;
1581
1582         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1583         if (ret < 0) {
1584                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1585                               "request failed for adapter %s\n",
1586                               zfcp_get_busid_by_adapter(adapter));
1587                 goto out;
1588         }
1589
1590         /* setup nameserver request */
1591         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1592         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1593         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1594         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1595         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1596         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1597         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1598         ct_iu_req->wwpn = erp_action->port->wwpn;
1599
1600         /* setup parameters for send generic command */
1601         gid_pn->ct.port = adapter->nameserver_port;
1602         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1603         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1604         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1605         gid_pn->port = erp_action->port;
1606
1607         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1608                                erp_action);
1609         if (ret) {
1610                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1611                               "failed for adapter %s\n",
1612                               zfcp_get_busid_by_adapter(adapter));
1613
1614                 zfcp_gid_pn_buffers_free(gid_pn);
1615         }
1616
1617  out:
1618         return ret;
1619 }
1620
1621 /**
1622  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1623  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1624  */
1625 static void zfcp_ns_gid_pn_handler(unsigned long data)
1626 {
1627         struct zfcp_port *port;
1628         struct zfcp_send_ct *ct;
1629         struct ct_iu_gid_pn_req *ct_iu_req;
1630         struct ct_iu_gid_pn_resp *ct_iu_resp;
1631         struct zfcp_gid_pn_data *gid_pn;
1632
1633
1634         gid_pn = (struct zfcp_gid_pn_data *) data;
1635         port = gid_pn->port;
1636         ct = &gid_pn->ct;
1637         ct_iu_req = zfcp_sg_to_address(ct->req);
1638         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1639
1640         if (ct->status != 0)
1641                 goto failed;
1642
1643         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1644                 /* FIXME: do we need some specific erp entry points */
1645                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1646                 goto failed;
1647         }
1648         /* paranoia */
1649         if (ct_iu_req->wwpn != port->wwpn) {
1650                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1651                                 "lookup does not match expected wwpn 0x%016Lx "
1652                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1653                                 zfcp_get_busid_by_port(port));
1654                 goto mismatch;
1655         }
1656
1657         /* looks like a valid d_id */
1658         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1659         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1660         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%06x\n",
1661                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1662         goto out;
1663
1664  mismatch:
1665         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1666         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1667                       sizeof(struct ct_iu_gid_pn_req));
1668         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1669                       sizeof(struct ct_iu_gid_pn_resp));
1670
1671  failed:
1672         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1673                         "0x%016Lx for adapter %s\n",
1674                         port->wwpn, zfcp_get_busid_by_port(port));
1675  out:
1676         zfcp_gid_pn_buffers_free(gid_pn);
1677         return;
1678 }
1679
1680 /* reject CT_IU reason codes acc. to FC-GS-4 */
1681 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1682         {0x01, "invalid command code"},
1683         {0x02, "invalid version level"},
1684         {0x03, "logical error"},
1685         {0x04, "invalid CT_IU size"},
1686         {0x05, "logical busy"},
1687         {0x07, "protocol error"},
1688         {0x09, "unable to perform command request"},
1689         {0x0b, "command not supported"},
1690         {0x0d, "server not available"},
1691         {0x0e, "session could not be established"},
1692         {0xff, "vendor specific error"},
1693         {0, NULL},
1694 };
1695
1696 /* LS_RJT reason codes acc. to FC-FS */
1697 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1698         {0x01, "invalid LS_Command code"},
1699         {0x03, "logical error"},
1700         {0x05, "logical busy"},
1701         {0x07, "protocol error"},
1702         {0x09, "unable to perform command request"},
1703         {0x0b, "command not supported"},
1704         {0x0e, "command already in progress"},
1705         {0xff, "vendor specific error"},
1706         {0, NULL},
1707 };
1708
1709 /* reject reason codes according to FC-PH/FC-FS */
1710 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1711         {0x01, "invalid D_ID"},
1712         {0x02, "invalid S_ID"},
1713         {0x03, "Nx_Port not available, temporary"},
1714         {0x04, "Nx_Port not available, permament"},
1715         {0x05, "class not supported"},
1716         {0x06, "delimiter usage error"},
1717         {0x07, "TYPE not supported"},
1718         {0x08, "invalid Link_Control"},
1719         {0x09, "invalid R_CTL field"},
1720         {0x0a, "invalid F_CTL field"},
1721         {0x0b, "invalid OX_ID"},
1722         {0x0c, "invalid RX_ID"},
1723         {0x0d, "invalid SEQ_ID"},
1724         {0x0e, "invalid DF_CTL"},
1725         {0x0f, "invalid SEQ_CNT"},
1726         {0x10, "invalid parameter field"},
1727         {0x11, "exchange error"},
1728         {0x12, "protocol error"},
1729         {0x13, "incorrect length"},
1730         {0x14, "unsupported ACK"},
1731         {0x15, "class of service not supported by entity at FFFFFE"},
1732         {0x16, "login required"},
1733         {0x17, "excessive sequences attempted"},
1734         {0x18, "unable to establish exchange"},
1735         {0x1a, "fabric path not available"},
1736         {0x1b, "invalid VC_ID (class 4)"},
1737         {0x1c, "invalid CS_CTL field"},
1738         {0x1d, "insufficient resources for VC (class 4)"},
1739         {0x1f, "invalid class of service"},
1740         {0x20, "preemption request rejected"},
1741         {0x21, "preemption not enabled"},
1742         {0x22, "multicast error"},
1743         {0x23, "multicast error terminate"},
1744         {0x24, "process login required"},
1745         {0xff, "vendor specific reject"},
1746         {0, NULL},
1747 };
1748
1749 /**
1750  * zfcp_rc_description - return description for given reaon code
1751  * @code: reason code
1752  * @rc_table: table of reason codes and descriptions
1753  */
1754 static const char *
1755 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1756 {
1757         const char *descr = "unknown reason code";
1758
1759         do {
1760                 if (code == rc_table->code) {
1761                         descr = rc_table->description;
1762                         break;
1763                 }
1764                 rc_table++;
1765         } while (rc_table->code && rc_table->description);
1766
1767         return descr;
1768 }
1769
1770 /**
1771  * zfcp_check_ct_response - evaluate reason code for CT_IU
1772  * @rjt: response payload to an CT_IU request
1773  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1774  */
1775 int
1776 zfcp_check_ct_response(struct ct_hdr *rjt)
1777 {
1778         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1779                 return 0;
1780
1781         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1782                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1783                                 "response code (0x%04hx)\n",
1784                                 rjt->cmd_rsp_code);
1785                 return 1;
1786         }
1787
1788         ZFCP_LOG_INFO("Generic Service command rejected\n");
1789         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1790                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1791                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1792                       (u32) rjt->vendor_unique);
1793
1794         return 1;
1795 }
1796
1797 /**
1798  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1799  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1800  * @rc_table: table of reason codes and descriptions
1801  */
1802 static void
1803 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1804                    const struct zfcp_rc_entry *rc_table)
1805 {
1806         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1807                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1808                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1809                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1810 }
1811
1812 /**
1813  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1814  * @sq: status qualifier word
1815  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1816  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1817  */
1818 int
1819 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1820 {
1821         int ret = -EIO;
1822
1823         if (sq == FSF_IOSTAT_NPORT_RJT) {
1824                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1825                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1826                 /* invalid d_id */
1827                 if (rjt_par->reason_code == 0x01)
1828                         ret = -EREMCHG;
1829         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1830                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1831                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1832                 /* invalid d_id */
1833                 if (rjt_par->reason_code == 0x01)
1834                         ret = -EREMCHG;
1835         } else if (sq == FSF_IOSTAT_LS_RJT) {
1836                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1837                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1838                 ret = -EREMOTEIO;
1839         } else
1840                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1841
1842         return ret;
1843 }
1844
1845 /**
1846  * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1847  * into zfcp_port structure
1848  * @port: zfcp_port structure
1849  * @plogi: plogi payload
1850  */
1851 void
1852 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1853 {
1854         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1855                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1856         if (plogi->serv_param.class1_serv_param[0] & 0x80)
1857                 port->supported_classes |= FC_COS_CLASS1;
1858         if (plogi->serv_param.class2_serv_param[0] & 0x80)
1859                 port->supported_classes |= FC_COS_CLASS2;
1860         if (plogi->serv_param.class3_serv_param[0] & 0x80)
1861                 port->supported_classes |= FC_COS_CLASS3;
1862         if (plogi->serv_param.class4_serv_param[0] & 0x80)
1863                 port->supported_classes |= FC_COS_CLASS4;
1864 }
1865
1866 #undef ZFCP_LOG_AREA