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                 sg->length = min(size, PAGE_SIZE);
 566                 sg->offset = 0;
 567                 address = (void *) get_zeroed_page(GFP_KERNEL);
 568                 if (address == NULL) {
 569                         sg_list->count = i;
 570                         zfcp_sg_list_free(sg_list);
 571                         retval = -ENOMEM;
 572                         goto out;
 573                 }
 574                 zfcp_address_to_sg(address, sg);
 575                 size -= sg->length;
 576         }
 577
 578  out:
 579         return retval;
 580 }
 581
 582
 583 /**
 584  * zfcp_sg_list_free - free memory of a scatter-gather list
 585  * @sg_list: structure describing a scatter-gather list
 586  *
 587  * Memory for each element in the scatter-gather list is freed.
 588  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 589  */
 590 static void
 591 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 592 {
 593         struct scatterlist *sg;
 594         unsigned int i;
 595
 596         BUG_ON(sg_list == NULL);
 597
 598         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 599                 free_page((unsigned long) zfcp_sg_to_address(sg));
 600
 601         sg_list->count = 0;
 602         kfree(sg_list->sg);
 603 }
 604
 605 /**
 606  * zfcp_sg_size - determine size of a scatter-gather list
 607  * @sg: array of (struct scatterlist)
 608  * @sg_count: elements in array
 609  * Return: size of entire scatter-gather list
 610  */
 611 static size_t zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 612 {
 613         unsigned int i;
 614         struct scatterlist *p;
 615         size_t size;
 616
 617         size = 0;
 618         for (i = 0, p = sg; i < sg_count; i++, p++) {
 619                 BUG_ON(p == NULL);
 620                 size += p->length;
 621         }
 622
 623         return size;
 624 }
 625
 626
 627 /**
 628  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 629  * @sg_list: structure describing a scatter-gather list
 630  * @user_buffer: pointer to buffer in user space
 631  * @size: number of bytes to be copied
 632  * Return: 0 on success, -EFAULT if copy_from_user fails.
 633  */
 634 static int
 635 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 636                             void __user *user_buffer,
 637                             size_t size)
 638 {
 639         struct scatterlist *sg;
 640         unsigned int length;
 641         void *zfcp_buffer;
 642         int retval = 0;
 643
 644         BUG_ON(sg_list == NULL);
 645
 646         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 647                 return -EFAULT;
 648
 649         for (sg = sg_list->sg; size > 0; sg++) {
 650                 length = min((unsigned int)size, sg->length);
 651                 zfcp_buffer = zfcp_sg_to_address(sg);
 652                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 653                         retval = -EFAULT;
 654                         goto out;
 655                 }
 656                 user_buffer += length;
 657                 size -= length;
 658         }
 659
 660  out:
 661         return retval;
 662 }
 663
 664
 665 /**
 666  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 667  * @user_buffer: pointer to buffer in user space
 668  * @sg_list: structure describing a scatter-gather list
 669  * @size: number of bytes to be copied
 670  * Return: 0 on success, -EFAULT if copy_to_user fails
 671  */
 672 static int
 673 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 674                           struct zfcp_sg_list *sg_list,
 675                           size_t size)
 676 {
 677         struct scatterlist *sg;
 678         unsigned int length;
 679         void *zfcp_buffer;
 680         int retval = 0;
 681
 682         BUG_ON(sg_list == NULL);
 683
 684         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 685                 return -EFAULT;
 686
 687         for (sg = sg_list->sg; size > 0; sg++) {
 688                 length = min((unsigned int) size, sg->length);
 689                 zfcp_buffer = zfcp_sg_to_address(sg);
 690                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 691                         retval = -EFAULT;
 692                         goto out;
 693                 }
 694                 user_buffer += length;
 695                 size -= length;
 696         }
 697
 698  out:
 699         return retval;
 700 }
 701
 702
 703 #undef ZFCP_LOG_AREA
 704
 705 /****************************************************************/
 706 /****** Functions for configuration/set-up of structures ********/
 707 /****************************************************************/
 708
 709 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 710
 711 /**
 712  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 713  * @port: pointer to port to search for unit
 714  * @fcp_lun: FCP LUN to search for
 715  * Traverse list of all units of a port and return pointer to a unit
 716  * with the given FCP LUN.
 717  */
 718 struct zfcp_unit *
 719 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 720 {
 721         struct zfcp_unit *unit;
 722         int found = 0;
 723
 724         list_for_each_entry(unit, &port->unit_list_head, list) {
 725                 if ((unit->fcp_lun == fcp_lun) &&
 726                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 727                 {
 728                         found = 1;
 729                         break;
 730                 }
 731         }
 732         return found ? unit : NULL;
 733 }
 734
 735 /**
 736  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 737  * @adapter: pointer to adapter to search for port
 738  * @wwpn: wwpn to search for
 739  * Traverse list of all ports of an adapter and return pointer to a port
 740  * with the given wwpn.
 741  */
 742 struct zfcp_port *
 743 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 744 {
 745         struct zfcp_port *port;
 746         int found = 0;
 747
 748         list_for_each_entry(port, &adapter->port_list_head, list) {
 749                 if ((port->wwpn == wwpn) &&
 750                     !(atomic_read(&port->status) &
 751                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 752                         found = 1;
 753                         break;
 754                 }
 755         }
 756         return found ? port : NULL;
 757 }
 758
 759 /**
 760  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 761  * @adapter: pointer to adapter to search for port
 762  * @d_id: d_id to search for
 763  * Traverse list of all ports of an adapter and return pointer to a port
 764  * with the given d_id.
 765  */
 766 struct zfcp_port *
 767 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 768 {
 769         struct zfcp_port *port;
 770         int found = 0;
 771
 772         list_for_each_entry(port, &adapter->port_list_head, list) {
 773                 if ((port->d_id == d_id) &&
 774                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 775                 {
 776                         found = 1;
 777                         break;
 778                 }
 779         }
 780         return found ? port : NULL;
 781 }
 782
 783 /**
 784  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 785  * @bus_id: bus_id to search for
 786  * Traverse list of all adapters and return pointer to an adapter
 787  * with the given bus_id.
 788  */
 789 struct zfcp_adapter *
 790 zfcp_get_adapter_by_busid(char *bus_id)
 791 {
 792         struct zfcp_adapter *adapter;
 793         int found = 0;
 794
 795         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 796                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 797                              BUS_ID_SIZE) == 0) &&
 798                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 799                                       &adapter->status)){
 800                         found = 1;
 801                         break;
 802                 }
 803         }
 804         return found ? adapter : NULL;
 805 }
 806
 807 /**
 808  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 809  * @port: pointer to port where unit is added
 810  * @fcp_lun: FCP LUN of unit to be enqueued
 811  * Return: pointer to enqueued unit on success, NULL on error
 812  * Locks: config_sema must be held to serialize changes to the unit list
 813  *
 814  * Sets up some unit internal structures and creates sysfs entry.
 815  */
 816 struct zfcp_unit *
 817 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 818 {
 819         struct zfcp_unit *unit;
 820
 821         /*
 822          * check that there is no unit with this FCP_LUN already in list
 823          * and enqueue it.
 824          * Note: Unlike for the adapter and the port, this is an error
 825          */
 826         read_lock_irq(&zfcp_data.config_lock);
 827         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 828         read_unlock_irq(&zfcp_data.config_lock);
 829         if (unit)
 830                 return NULL;
 831
 832         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 833         if (!unit)
 834                 return NULL;
 835
 836         /* initialise reference count stuff */
 837         atomic_set(&unit->refcount, 0);
 838         init_waitqueue_head(&unit->remove_wq);
 839
 840         unit->port = port;
 841         unit->fcp_lun = fcp_lun;
 842
 843         /* setup for sysfs registration */
 844         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 845         unit->sysfs_device.parent = &port->sysfs_device;
 846         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 847         dev_set_drvdata(&unit->sysfs_device, unit);
 848
 849         init_waitqueue_head(&unit->scsi_scan_wq);
 850
 851         /* mark unit unusable as long as sysfs registration is not complete */
 852         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 853
 854         if (device_register(&unit->sysfs_device)) {
 855                 kfree(unit);
 856                 return NULL;
 857         }
 858
 859         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 860                 device_unregister(&unit->sysfs_device);
 861                 return NULL;
 862         }
 863
 864         zfcp_unit_get(unit);
 865         unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
 866
 867         write_lock_irq(&zfcp_data.config_lock);
 868         list_add_tail(&unit->list, &port->unit_list_head);
 869         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 870         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 871         write_unlock_irq(&zfcp_data.config_lock);
 872
 873         port->units++;
 874         zfcp_port_get(port);
 875
 876         return unit;
 877 }
 878
 879 void
 880 zfcp_unit_dequeue(struct zfcp_unit *unit)
 881 {
 882         zfcp_unit_wait(unit);
 883         write_lock_irq(&zfcp_data.config_lock);
 884         list_del(&unit->list);
 885         write_unlock_irq(&zfcp_data.config_lock);
 886         unit->port->units--;
 887         zfcp_port_put(unit->port);
 888         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 889         device_unregister(&unit->sysfs_device);
 890 }
 891
 892 /*
 893  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 894  * commands.
 895  * It also genrates fcp-nameserver request/response buffer and unsolicited
 896  * status read fsf_req buffers.
 897  *
 898  * locks:       must only be called with zfcp_data.config_sema taken
 899  */
 900 static int
 901 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 902 {
 903         adapter->pool.fsf_req_erp =
 904                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 905                                          zfcp_data.fsf_req_qtcb_cache);
 906         if (!adapter->pool.fsf_req_erp)
 907                 return -ENOMEM;
 908
 909         adapter->pool.fsf_req_scsi =
 910                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 911                                          zfcp_data.fsf_req_qtcb_cache);
 912         if (!adapter->pool.fsf_req_scsi)
 913                 return -ENOMEM;
 914
 915         adapter->pool.fsf_req_abort =
 916                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 917                                          zfcp_data.fsf_req_qtcb_cache);
 918         if (!adapter->pool.fsf_req_abort)
 919                 return -ENOMEM;
 920
 921         adapter->pool.fsf_req_status_read =
 922                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 923                                             sizeof(struct zfcp_fsf_req));
 924         if (!adapter->pool.fsf_req_status_read)
 925                 return -ENOMEM;
 926
 927         adapter->pool.data_status_read =
 928                 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
 929                                          zfcp_data.sr_buffer_cache);
 930         if (!adapter->pool.data_status_read)
 931                 return -ENOMEM;
 932
 933         adapter->pool.data_gid_pn =
 934                 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
 935                                          zfcp_data.gid_pn_cache);
 936         if (!adapter->pool.data_gid_pn)
 937                 return -ENOMEM;
 938
 939         return 0;
 940 }
 941
 942 /**
 943  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 944  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 945  * locking:  zfcp_data.config_sema must be held
 946  */
 947 static void
 948 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 949 {
 950         if (adapter->pool.fsf_req_erp)
 951                 mempool_destroy(adapter->pool.fsf_req_erp);
 952         if (adapter->pool.fsf_req_scsi)
 953                 mempool_destroy(adapter->pool.fsf_req_scsi);
 954         if (adapter->pool.fsf_req_abort)
 955                 mempool_destroy(adapter->pool.fsf_req_abort);
 956         if (adapter->pool.fsf_req_status_read)
 957                 mempool_destroy(adapter->pool.fsf_req_status_read);
 958         if (adapter->pool.data_status_read)
 959                 mempool_destroy(adapter->pool.data_status_read);
 960         if (adapter->pool.data_gid_pn)
 961                 mempool_destroy(adapter->pool.data_gid_pn);
 962 }
 963
 964 static void zfcp_dummy_release(struct device *dev)
 965 {
 966         return;
 967 }
 968
 969 /*
 970  * Enqueues an adapter at the end of the adapter list in the driver data.
 971  * All adapter internal structures are set up.
 972  * Proc-fs entries are also created.
 973  *
 974  * returns:     0             if a new adapter was successfully enqueued
 975  *              ZFCP_KNOWN    if an adapter with this devno was already present
 976  *              -ENOMEM       if alloc failed
 977  * locks:       config_sema must be held to serialise changes to the adapter list
 978  */
 979 struct zfcp_adapter *
 980 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 981 {
 982         int retval = 0;
 983         struct zfcp_adapter *adapter;
 984
 985         /*
 986          * Note: It is safe to release the list_lock, as any list changes
 987          * are protected by the config_sema, which must be held to get here
 988          */
 989
 990         /* try to allocate new adapter data structure (zeroed) */
 991         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
 992         if (!adapter) {
 993                 ZFCP_LOG_INFO("error: allocation of base adapter "
 994                               "structure failed\n");
 995                 goto out;
 996         }
 997
 998         ccw_device->handler = NULL;
 999
1000         /* save ccw_device pointer */
1001         adapter->ccw_device = ccw_device;
1002
1003         retval = zfcp_qdio_allocate_queues(adapter);
1004         if (retval)
1005                 goto queues_alloc_failed;
1006
1007         retval = zfcp_qdio_allocate(adapter);
1008         if (retval)
1009                 goto qdio_allocate_failed;
1010
1011         retval = zfcp_allocate_low_mem_buffers(adapter);
1012         if (retval) {
1013                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1014                 goto failed_low_mem_buffers;
1015         }
1016
1017         /* initialise reference count stuff */
1018         atomic_set(&adapter->refcount, 0);
1019         init_waitqueue_head(&adapter->remove_wq);
1020
1021         /* initialise list of ports */
1022         INIT_LIST_HEAD(&adapter->port_list_head);
1023
1024         /* initialise list of ports to be removed */
1025         INIT_LIST_HEAD(&adapter->port_remove_lh);
1026
1027         /* initialize list of fsf requests */
1028         spin_lock_init(&adapter->req_list_lock);
1029         retval = zfcp_reqlist_alloc(adapter);
1030         if (retval) {
1031                 ZFCP_LOG_INFO("request list initialization failed\n");
1032                 goto failed_low_mem_buffers;
1033         }
1034
1035         /* initialize debug locks */
1036
1037         spin_lock_init(&adapter->erp_dbf_lock);
1038         spin_lock_init(&adapter->hba_dbf_lock);
1039         spin_lock_init(&adapter->san_dbf_lock);
1040         spin_lock_init(&adapter->scsi_dbf_lock);
1041
1042         retval = zfcp_adapter_debug_register(adapter);
1043         if (retval)
1044                 goto debug_register_failed;
1045
1046         /* initialize error recovery stuff */
1047
1048         rwlock_init(&adapter->erp_lock);
1049         sema_init(&adapter->erp_ready_sem, 0);
1050         INIT_LIST_HEAD(&adapter->erp_ready_head);
1051         INIT_LIST_HEAD(&adapter->erp_running_head);
1052
1053         /* initialize abort lock */
1054         rwlock_init(&adapter->abort_lock);
1055
1056         /* initialise some erp stuff */
1057         init_waitqueue_head(&adapter->erp_thread_wqh);
1058         init_waitqueue_head(&adapter->erp_done_wqh);
1059
1060         /* initialize lock of associated request queue */
1061         rwlock_init(&adapter->request_queue.queue_lock);
1062
1063         /* mark adapter unusable as long as sysfs registration is not complete */
1064         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1065
1066         dev_set_drvdata(&ccw_device->dev, adapter);
1067
1068         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1069                 goto sysfs_failed;
1070
1071         adapter->generic_services.parent = &adapter->ccw_device->dev;
1072         adapter->generic_services.release = zfcp_dummy_release;
1073         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1074                  "generic_services");
1075
1076         if (device_register(&adapter->generic_services))
1077                 goto generic_services_failed;
1078
1079         /* put allocated adapter at list tail */
1080         write_lock_irq(&zfcp_data.config_lock);
1081         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1082         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1083         write_unlock_irq(&zfcp_data.config_lock);
1084
1085         zfcp_data.adapters++;
1086
1087         goto out;
1088
1089  generic_services_failed:
1090         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1091  sysfs_failed:
1092         zfcp_adapter_debug_unregister(adapter);
1093  debug_register_failed:
1094         dev_set_drvdata(&ccw_device->dev, NULL);
1095         zfcp_reqlist_free(adapter);
1096  failed_low_mem_buffers:
1097         zfcp_free_low_mem_buffers(adapter);
1098         if (qdio_free(ccw_device) != 0)
1099                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1100                                 zfcp_get_busid_by_adapter(adapter));
1101  qdio_allocate_failed:
1102         zfcp_qdio_free_queues(adapter);
1103  queues_alloc_failed:
1104         kfree(adapter);
1105         adapter = NULL;
1106  out:
1107         return adapter;
1108 }
1109
1110 /*
1111  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1112  *              !0 - struct zfcp_adapter  data structure could not be removed
1113  *                      (e.g. still used)
1114  * locks:       adapter list write lock is assumed to be held by caller
1115  */
1116 void
1117 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1118 {
1119         int retval = 0;
1120         unsigned long flags;
1121
1122         zfcp_adapter_scsi_unregister(adapter);
1123         device_unregister(&adapter->generic_services);
1124         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1125         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1126         /* sanity check: no pending FSF requests */
1127         spin_lock_irqsave(&adapter->req_list_lock, flags);
1128         retval = zfcp_reqlist_isempty(adapter);
1129         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1130         if (!retval) {
1131                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1132                                 "%i requests outstanding\n",
1133                                 zfcp_get_busid_by_adapter(adapter), adapter,
1134                                 atomic_read(&adapter->reqs_active));
1135                 retval = -EBUSY;
1136                 goto out;
1137         }
1138
1139         zfcp_adapter_debug_unregister(adapter);
1140
1141         /* remove specified adapter data structure from list */
1142         write_lock_irq(&zfcp_data.config_lock);
1143         list_del(&adapter->list);
1144         write_unlock_irq(&zfcp_data.config_lock);
1145
1146         /* decrease number of adapters in list */
1147         zfcp_data.adapters--;
1148
1149         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1150                        "%i adapters still in list\n",
1151                        zfcp_get_busid_by_adapter(adapter),
1152                        adapter, zfcp_data.adapters);
1153
1154         retval = qdio_free(adapter->ccw_device);
1155         if (retval)
1156                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1157                                 zfcp_get_busid_by_adapter(adapter));
1158
1159         zfcp_free_low_mem_buffers(adapter);
1160         /* free memory of adapter data structure and queues */
1161         zfcp_qdio_free_queues(adapter);
1162         zfcp_reqlist_free(adapter);
1163         kfree(adapter->fc_stats);
1164         kfree(adapter->stats_reset_data);
1165         ZFCP_LOG_TRACE("freeing adapter structure\n");
1166         kfree(adapter);
1167  out:
1168         return;
1169 }
1170
1171 /**
1172  * zfcp_port_enqueue - enqueue port to port list of adapter
1173  * @adapter: adapter where remote port is added
1174  * @wwpn: WWPN of the remote port to be enqueued
1175  * @status: initial status for the port
1176  * @d_id: destination id of the remote port to be enqueued
1177  * Return: pointer to enqueued port on success, NULL on error
1178  * Locks: config_sema must be held to serialize changes to the port list
1179  *
1180  * All port internal structures are set up and the sysfs entry is generated.
1181  * d_id is used to enqueue ports with a well known address like the Directory
1182  * Service for nameserver lookup.
1183  */
1184 struct zfcp_port *
1185 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1186                   u32 d_id)
1187 {
1188         struct zfcp_port *port;
1189         int check_wwpn;
1190
1191         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1192         /*
1193          * check that there is no port with this WWPN already in list
1194          */
1195         if (check_wwpn) {
1196                 read_lock_irq(&zfcp_data.config_lock);
1197                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1198                 read_unlock_irq(&zfcp_data.config_lock);
1199                 if (port)
1200                         return NULL;
1201         }
1202
1203         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1204         if (!port)
1205                 return NULL;
1206
1207         /* initialise reference count stuff */
1208         atomic_set(&port->refcount, 0);
1209         init_waitqueue_head(&port->remove_wq);
1210
1211         INIT_LIST_HEAD(&port->unit_list_head);
1212         INIT_LIST_HEAD(&port->unit_remove_lh);
1213
1214         port->adapter = adapter;
1215
1216         if (check_wwpn)
1217                 port->wwpn = wwpn;
1218
1219         atomic_set_mask(status, &port->status);
1220
1221         /* setup for sysfs registration */
1222         if (status & ZFCP_STATUS_PORT_WKA) {
1223                 switch (d_id) {
1224                 case ZFCP_DID_DIRECTORY_SERVICE:
1225                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1226                                  "directory");
1227                         break;
1228                 case ZFCP_DID_MANAGEMENT_SERVICE:
1229                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1230                                  "management");
1231                         break;
1232                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1233                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1234                                  "key_distribution");
1235                         break;
1236                 case ZFCP_DID_ALIAS_SERVICE:
1237                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1238                                  "alias");
1239                         break;
1240                 case ZFCP_DID_TIME_SERVICE:
1241                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1242                                  "time");
1243                         break;
1244                 default:
1245                         kfree(port);
1246                         return NULL;
1247                 }
1248                 port->d_id = d_id;
1249                 port->sysfs_device.parent = &adapter->generic_services;
1250         } else {
1251                 snprintf(port->sysfs_device.bus_id,
1252                          BUS_ID_SIZE, "0x%016llx", wwpn);
1253                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1254         }
1255         port->sysfs_device.release = zfcp_sysfs_port_release;
1256         dev_set_drvdata(&port->sysfs_device, port);
1257
1258         /* mark port unusable as long as sysfs registration is not complete */
1259         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1260
1261         if (device_register(&port->sysfs_device)) {
1262                 kfree(port);
1263                 return NULL;
1264         }
1265
1266         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1267                 device_unregister(&port->sysfs_device);
1268                 return NULL;
1269         }
1270
1271         zfcp_port_get(port);
1272
1273         write_lock_irq(&zfcp_data.config_lock);
1274         list_add_tail(&port->list, &adapter->port_list_head);
1275         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1276         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1277         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1278                 if (!adapter->nameserver_port)
1279                         adapter->nameserver_port = port;
1280         adapter->ports++;
1281         write_unlock_irq(&zfcp_data.config_lock);
1282
1283         zfcp_adapter_get(adapter);
1284
1285         return port;
1286 }
1287
1288 void
1289 zfcp_port_dequeue(struct zfcp_port *port)
1290 {
1291         zfcp_port_wait(port);
1292         write_lock_irq(&zfcp_data.config_lock);
1293         list_del(&port->list);
1294         port->adapter->ports--;
1295         write_unlock_irq(&zfcp_data.config_lock);
1296         if (port->rport)
1297                 fc_remote_port_delete(port->rport);
1298         port->rport = NULL;
1299         zfcp_adapter_put(port->adapter);
1300         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1301                                      atomic_read(&port->status));
1302         device_unregister(&port->sysfs_device);
1303 }
1304
1305 /* Enqueues a nameserver port */
1306 int
1307 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1308 {
1309         struct zfcp_port *port;
1310
1311         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1312                                  ZFCP_DID_DIRECTORY_SERVICE);
1313         if (!port) {
1314                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1315                               "adapter %s failed\n",
1316                               zfcp_get_busid_by_adapter(adapter));
1317                 return -ENXIO;
1318         }
1319         zfcp_port_put(port);
1320
1321         return 0;
1322 }
1323
1324 #undef ZFCP_LOG_AREA
1325
1326 /****************************************************************/
1327 /******* Fibre Channel Standard related Functions  **************/
1328 /****************************************************************/
1329
1330 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1331
1332 static void
1333 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1334                            struct fsf_status_read_buffer *status_buffer)
1335 {
1336         struct fcp_rscn_head *fcp_rscn_head;
1337         struct fcp_rscn_element *fcp_rscn_element;
1338         struct zfcp_port *port;
1339         u16 i;
1340         u16 no_entries;
1341         u32 range_mask;
1342         unsigned long flags;
1343
1344         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1345         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1346
1347         /* see FC-FS */
1348         no_entries = (fcp_rscn_head->payload_len / 4);
1349
1350         for (i = 1; i < no_entries; i++) {
1351                 /* skip head and start with 1st element */
1352                 fcp_rscn_element++;
1353                 switch (fcp_rscn_element->addr_format) {
1354                 case ZFCP_PORT_ADDRESS:
1355                         range_mask = ZFCP_PORTS_RANGE_PORT;
1356                         break;
1357                 case ZFCP_AREA_ADDRESS:
1358                         range_mask = ZFCP_PORTS_RANGE_AREA;
1359                         break;
1360                 case ZFCP_DOMAIN_ADDRESS:
1361                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1362                         break;
1363                 case ZFCP_FABRIC_ADDRESS:
1364                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1365                         break;
1366                 default:
1367                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1368                                       "address format\n");
1369                         continue;
1370                 }
1371                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1372                 list_for_each_entry(port, &adapter->port_list_head, list) {
1373                         if (atomic_test_mask
1374                             (ZFCP_STATUS_PORT_WKA, &port->status))
1375                                 continue;
1376                         /* Do we know this port? If not skip it. */
1377                         if (!atomic_test_mask
1378                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1379                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1380                                               "port 0x%016Lx\n", port->wwpn);
1381                                 zfcp_erp_port_reopen(port,
1382                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1383                                 continue;
1384                         }
1385
1386                         /*
1387                          * FIXME: race: d_id might being invalidated
1388                          * (...DID_DID reset)
1389                          */
1390                         if ((port->d_id & range_mask)
1391                             == (fcp_rscn_element->nport_did & range_mask)) {
1392                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1393                                                fcp_rscn_element->nport_did);
1394                                 /*
1395                                  * Unfortunately, an RSCN does not specify the
1396                                  * type of change a target underwent. We assume
1397                                  * that it makes sense to reopen the link.
1398                                  * FIXME: Shall we try to find out more about
1399                                  * the target and link state before closing it?
1400                                  * How to accomplish this? (nameserver?)
1401                                  * Where would such code be put in?
1402                                  * (inside or outside erp)
1403                                  */
1404                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1405                                               "port 0x%016Lx\n", port->wwpn);
1406                                 zfcp_test_link(port);
1407                         }
1408                 }
1409                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1410         }
1411 }
1412
1413 static void
1414 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1415                             struct fsf_status_read_buffer *status_buffer)
1416 {
1417         struct fsf_plogi *els_plogi;
1418         struct zfcp_port *port;
1419         unsigned long flags;
1420
1421         els_plogi = (struct fsf_plogi *) status_buffer->payload;
1422         read_lock_irqsave(&zfcp_data.config_lock, flags);
1423         list_for_each_entry(port, &adapter->port_list_head, list) {
1424                 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1425                         break;
1426         }
1427         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1428
1429         if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1430                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1431                                "with d_id 0x%06x on adapter %s\n",
1432                                status_buffer->d_id,
1433                                zfcp_get_busid_by_adapter(adapter));
1434         } else {
1435                 zfcp_erp_port_forced_reopen(port, 0);
1436         }
1437 }
1438
1439 static void
1440 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1441                            struct fsf_status_read_buffer *status_buffer)
1442 {
1443         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1444         struct zfcp_port *port;
1445         unsigned long flags;
1446
1447         read_lock_irqsave(&zfcp_data.config_lock, flags);
1448         list_for_each_entry(port, &adapter->port_list_head, list) {
1449                 if (port->wwpn == els_logo->nport_wwpn)
1450                         break;
1451         }
1452         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1453
1454         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1455                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1456                                "with d_id 0x%06x on adapter %s\n",
1457                                status_buffer->d_id,
1458                                zfcp_get_busid_by_adapter(adapter));
1459         } else {
1460                 zfcp_erp_port_forced_reopen(port, 0);
1461         }
1462 }
1463
1464 static void
1465 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1466                               struct fsf_status_read_buffer *status_buffer)
1467 {
1468         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1469                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1470                         zfcp_get_busid_by_adapter(adapter));
1471
1472 }
1473
1474 void
1475 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1476 {
1477         struct fsf_status_read_buffer *status_buffer;
1478         u32 els_type;
1479         struct zfcp_adapter *adapter;
1480
1481         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1482         els_type = *(u32 *) (status_buffer->payload);
1483         adapter = fsf_req->adapter;
1484
1485         zfcp_san_dbf_event_incoming_els(fsf_req);
1486         if (els_type == LS_PLOGI)
1487                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1488         else if (els_type == LS_LOGO)
1489                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1490         else if ((els_type & 0xffff0000) == LS_RSCN)
1491                 /* we are only concerned with the command, not the length */
1492                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1493         else
1494                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1495 }
1496
1497
1498 /**
1499  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1500  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1501  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1502  */
1503 static int
1504 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1505 {
1506         struct zfcp_gid_pn_data *data;
1507
1508         if (pool != NULL) {
1509                 data = mempool_alloc(pool, GFP_ATOMIC);
1510                 if (likely(data != NULL)) {
1511                         data->ct.pool = pool;
1512                 }
1513         } else {
1514                 data = kmem_cache_alloc(zfcp_data.gid_pn_cache, GFP_ATOMIC);
1515         }
1516
1517         if (NULL == data)
1518                 return -ENOMEM;
1519
1520         memset(data, 0, sizeof(*data));
1521         data->ct.req = &data->req;
1522         data->ct.resp = &data->resp;
1523         data->ct.req_count = data->ct.resp_count = 1;
1524         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1525         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1526         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1527         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1528
1529         *gid_pn = data;
1530         return 0;
1531 }
1532
1533 /**
1534  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1535  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1536  */
1537 static void zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1538 {
1539         if (gid_pn->ct.pool)
1540                 mempool_free(gid_pn, gid_pn->ct.pool);
1541         else
1542                 kmem_cache_free(zfcp_data.gid_pn_cache, gid_pn);
1543 }
1544
1545 /**
1546  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1547  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1548  */
1549 int
1550 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1551 {
1552         int ret;
1553         struct ct_iu_gid_pn_req *ct_iu_req;
1554         struct zfcp_gid_pn_data *gid_pn;
1555         struct zfcp_adapter *adapter = erp_action->adapter;
1556
1557         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1558         if (ret < 0) {
1559                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1560                               "request failed for adapter %s\n",
1561                               zfcp_get_busid_by_adapter(adapter));
1562                 goto out;
1563         }
1564
1565         /* setup nameserver request */
1566         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1567         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1568         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1569         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1570         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1571         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1572         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1573         ct_iu_req->wwpn = erp_action->port->wwpn;
1574
1575         /* setup parameters for send generic command */
1576         gid_pn->ct.port = adapter->nameserver_port;
1577         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1578         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1579         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1580         gid_pn->port = erp_action->port;
1581
1582         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1583                                erp_action);
1584         if (ret) {
1585                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1586                               "failed for adapter %s\n",
1587                               zfcp_get_busid_by_adapter(adapter));
1588
1589                 zfcp_gid_pn_buffers_free(gid_pn);
1590         }
1591
1592  out:
1593         return ret;
1594 }
1595
1596 /**
1597  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1598  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1599  */
1600 static void zfcp_ns_gid_pn_handler(unsigned long data)
1601 {
1602         struct zfcp_port *port;
1603         struct zfcp_send_ct *ct;
1604         struct ct_iu_gid_pn_req *ct_iu_req;
1605         struct ct_iu_gid_pn_resp *ct_iu_resp;
1606         struct zfcp_gid_pn_data *gid_pn;
1607
1608
1609         gid_pn = (struct zfcp_gid_pn_data *) data;
1610         port = gid_pn->port;
1611         ct = &gid_pn->ct;
1612         ct_iu_req = zfcp_sg_to_address(ct->req);
1613         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1614
1615         if (ct->status != 0)
1616                 goto failed;
1617
1618         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1619                 /* FIXME: do we need some specific erp entry points */
1620                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1621                 goto failed;
1622         }
1623         /* paranoia */
1624         if (ct_iu_req->wwpn != port->wwpn) {
1625                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1626                                 "lookup does not match expected wwpn 0x%016Lx "
1627                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1628                                 zfcp_get_busid_by_port(port));
1629                 goto mismatch;
1630         }
1631
1632         /* looks like a valid d_id */
1633         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1634         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1635         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%06x\n",
1636                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1637         goto out;
1638
1639  mismatch:
1640         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1641         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1642                       sizeof(struct ct_iu_gid_pn_req));
1643         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1644                       sizeof(struct ct_iu_gid_pn_resp));
1645
1646  failed:
1647         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1648                         "0x%016Lx for adapter %s\n",
1649                         port->wwpn, zfcp_get_busid_by_port(port));
1650  out:
1651         zfcp_gid_pn_buffers_free(gid_pn);
1652         return;
1653 }
1654
1655 /* reject CT_IU reason codes acc. to FC-GS-4 */
1656 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1657         {0x01, "invalid command code"},
1658         {0x02, "invalid version level"},
1659         {0x03, "logical error"},
1660         {0x04, "invalid CT_IU size"},
1661         {0x05, "logical busy"},
1662         {0x07, "protocol error"},
1663         {0x09, "unable to perform command request"},
1664         {0x0b, "command not supported"},
1665         {0x0d, "server not available"},
1666         {0x0e, "session could not be established"},
1667         {0xff, "vendor specific error"},
1668         {0, NULL},
1669 };
1670
1671 /* LS_RJT reason codes acc. to FC-FS */
1672 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1673         {0x01, "invalid LS_Command code"},
1674         {0x03, "logical error"},
1675         {0x05, "logical busy"},
1676         {0x07, "protocol error"},
1677         {0x09, "unable to perform command request"},
1678         {0x0b, "command not supported"},
1679         {0x0e, "command already in progress"},
1680         {0xff, "vendor specific error"},
1681         {0, NULL},
1682 };
1683
1684 /* reject reason codes according to FC-PH/FC-FS */
1685 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1686         {0x01, "invalid D_ID"},
1687         {0x02, "invalid S_ID"},
1688         {0x03, "Nx_Port not available, temporary"},
1689         {0x04, "Nx_Port not available, permament"},
1690         {0x05, "class not supported"},
1691         {0x06, "delimiter usage error"},
1692         {0x07, "TYPE not supported"},
1693         {0x08, "invalid Link_Control"},
1694         {0x09, "invalid R_CTL field"},
1695         {0x0a, "invalid F_CTL field"},
1696         {0x0b, "invalid OX_ID"},
1697         {0x0c, "invalid RX_ID"},
1698         {0x0d, "invalid SEQ_ID"},
1699         {0x0e, "invalid DF_CTL"},
1700         {0x0f, "invalid SEQ_CNT"},
1701         {0x10, "invalid parameter field"},
1702         {0x11, "exchange error"},
1703         {0x12, "protocol error"},
1704         {0x13, "incorrect length"},
1705         {0x14, "unsupported ACK"},
1706         {0x15, "class of service not supported by entity at FFFFFE"},
1707         {0x16, "login required"},
1708         {0x17, "excessive sequences attempted"},
1709         {0x18, "unable to establish exchange"},
1710         {0x1a, "fabric path not available"},
1711         {0x1b, "invalid VC_ID (class 4)"},
1712         {0x1c, "invalid CS_CTL field"},
1713         {0x1d, "insufficient resources for VC (class 4)"},
1714         {0x1f, "invalid class of service"},
1715         {0x20, "preemption request rejected"},
1716         {0x21, "preemption not enabled"},
1717         {0x22, "multicast error"},
1718         {0x23, "multicast error terminate"},
1719         {0x24, "process login required"},
1720         {0xff, "vendor specific reject"},
1721         {0, NULL},
1722 };
1723
1724 /**
1725  * zfcp_rc_description - return description for given reaon code
1726  * @code: reason code
1727  * @rc_table: table of reason codes and descriptions
1728  */
1729 static const char *
1730 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1731 {
1732         const char *descr = "unknown reason code";
1733
1734         do {
1735                 if (code == rc_table->code) {
1736                         descr = rc_table->description;
1737                         break;
1738                 }
1739                 rc_table++;
1740         } while (rc_table->code && rc_table->description);
1741
1742         return descr;
1743 }
1744
1745 /**
1746  * zfcp_check_ct_response - evaluate reason code for CT_IU
1747  * @rjt: response payload to an CT_IU request
1748  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1749  */
1750 int
1751 zfcp_check_ct_response(struct ct_hdr *rjt)
1752 {
1753         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1754                 return 0;
1755
1756         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1757                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1758                                 "response code (0x%04hx)\n",
1759                                 rjt->cmd_rsp_code);
1760                 return 1;
1761         }
1762
1763         ZFCP_LOG_INFO("Generic Service command rejected\n");
1764         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1765                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1766                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1767                       (u32) rjt->vendor_unique);
1768
1769         return 1;
1770 }
1771
1772 /**
1773  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1774  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1775  * @rc_table: table of reason codes and descriptions
1776  */
1777 static void
1778 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1779                    const struct zfcp_rc_entry *rc_table)
1780 {
1781         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1782                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1783                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1784                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1785 }
1786
1787 /**
1788  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1789  * @sq: status qualifier word
1790  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1791  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1792  */
1793 int
1794 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1795 {
1796         int ret = -EIO;
1797
1798         if (sq == FSF_IOSTAT_NPORT_RJT) {
1799                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1800                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1801                 /* invalid d_id */
1802                 if (rjt_par->reason_code == 0x01)
1803                         ret = -EREMCHG;
1804         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1805                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1806                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1807                 /* invalid d_id */
1808                 if (rjt_par->reason_code == 0x01)
1809                         ret = -EREMCHG;
1810         } else if (sq == FSF_IOSTAT_LS_RJT) {
1811                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1812                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1813                 ret = -EREMOTEIO;
1814         } else
1815                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1816
1817         return ret;
1818 }
1819
1820 /**
1821  * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1822  * into zfcp_port structure
1823  * @port: zfcp_port structure
1824  * @plogi: plogi payload
1825  */
1826 void
1827 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1828 {
1829         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1830                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1831         if (plogi->serv_param.class1_serv_param[0] & 0x80)
1832                 port->supported_classes |= FC_COS_CLASS1;
1833         if (plogi->serv_param.class2_serv_param[0] & 0x80)
1834                 port->supported_classes |= FC_COS_CLASS2;
1835         if (plogi->serv_param.class3_serv_param[0] & 0x80)
1836                 port->supported_classes |= FC_COS_CLASS3;
1837         if (plogi->serv_param.class4_serv_param[0] & 0x80)
1838                 port->supported_classes |= FC_COS_CLASS4;
1839 }
1840
1841 #undef ZFCP_LOG_AREA