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

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 /*
  23  * Driver authors:
  24  *            Martin Peschke (originator of the driver)
  25  *            Raimund Schroeder
  26  *            Aron Zeh
  27  *            Wolfgang Taphorn
  28  *            Stefan Bader
  29  *            Heiko Carstens (kernel 2.6 port of the driver)
  30  *            Andreas Herrmann
  31  *            Maxim Shchetynin
  32  *            Volker Sameske
  33  *            Ralph Wuerthner
  34  */
  35
  36 #include "zfcp_ext.h"
  37
  38 /* accumulated log level (module parameter) */
  39 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
  40 static char *device;
  41 /*********************** FUNCTION PROTOTYPES *********************************/
  42
  43 /* written against the module interface */
  44 static int __init  zfcp_module_init(void);
  45
  46 /* FCP related */
  47 static void zfcp_ns_gid_pn_handler(unsigned long);
  48
  49 /* miscellaneous */
  50 static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
  51 static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
  52 static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
  53                                               void __user *, size_t);
  54 static inline int zfcp_sg_list_copy_to_user(void __user *,
  55                                             struct zfcp_sg_list *, size_t);
  56
  57 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
  58
  59 #define ZFCP_CFDC_IOC_MAGIC                     0xDD
  60 #define ZFCP_CFDC_IOC \
  61         _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
  62
  63
  64 static struct file_operations zfcp_cfdc_fops = {
  65         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
  66 #ifdef CONFIG_COMPAT
  67         .compat_ioctl = zfcp_cfdc_dev_ioctl
  68 #endif
  69 };
  70
  71 static struct miscdevice zfcp_cfdc_misc = {
  72         .minor = ZFCP_CFDC_DEV_MINOR,
  73         .name = ZFCP_CFDC_DEV_NAME,
  74         .fops = &zfcp_cfdc_fops
  75 };
  76
  77 /*********************** KERNEL/MODULE PARAMETERS  ***************************/
  78
  79 /* declare driver module init/cleanup functions */
  80 module_init(zfcp_module_init);
  81
  82 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  83 MODULE_DESCRIPTION
  84     ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
  85 MODULE_LICENSE("GPL");
  86
  87 module_param(device, charp, 0400);
  88 MODULE_PARM_DESC(device, "specify initial device");
  89
  90 module_param(loglevel, uint, 0400);
  91 MODULE_PARM_DESC(loglevel,
  92                  "log levels, 8 nibbles: "
  93                  "FC ERP QDIO CIO Config FSF SCSI Other, "
  94                  "levels: 0=none 1=normal 2=devel 3=trace");
  95
  96 /****************************************************************/
  97 /************** Functions without logging ***********************/
  98 /****************************************************************/
  99
 100 void
 101 _zfcp_hex_dump(char *addr, int count)
 102 {
 103         int i;
 104         for (i = 0; i < count; i++) {
 105                 printk("%02x", addr[i]);
 106                 if ((i % 4) == 3)
 107                         printk(" ");
 108                 if ((i % 32) == 31)
 109                         printk("\n");
 110         }
 111         if (((i-1) % 32) != 31)
 112                 printk("\n");
 113 }
 114
 115
 116 /****************************************************************/
 117 /****** Functions to handle the request ID hash table    ********/
 118 /****************************************************************/
 119
 120 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
 121
 122 static int zfcp_reqlist_init(struct zfcp_adapter *adapter)
 123 {
 124         int i;
 125
 126         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
 127                                     GFP_KERNEL);
 128
 129         if (!adapter->req_list)
 130                 return -ENOMEM;
 131
 132         for (i=0; i<REQUEST_LIST_SIZE; i++)
 133                 INIT_LIST_HEAD(&adapter->req_list[i]);
 134
 135         return 0;
 136 }
 137
 138 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
 139 {
 140         struct zfcp_fsf_req *request, *tmp;
 141         unsigned int i;
 142
 143         for (i=0; i<REQUEST_LIST_SIZE; i++) {
 144                 if (list_empty(&adapter->req_list[i]))
 145                         continue;
 146
 147                 list_for_each_entry_safe(request, tmp,
 148                                          &adapter->req_list[i], list)
 149                         list_del(&request->list);
 150         }
 151
 152         kfree(adapter->req_list);
 153 }
 154
 155 void zfcp_reqlist_add(struct zfcp_adapter *adapter,
 156                       struct zfcp_fsf_req *fsf_req)
 157 {
 158         unsigned int i;
 159
 160         i = fsf_req->req_id % REQUEST_LIST_SIZE;
 161         list_add_tail(&fsf_req->list, &adapter->req_list[i]);
 162 }
 163
 164 void zfcp_reqlist_remove(struct zfcp_adapter *adapter, unsigned long req_id)
 165 {
 166         struct zfcp_fsf_req *request, *tmp;
 167         unsigned int i, counter;
 168         u64 dbg_tmp[2];
 169
 170         i = req_id % REQUEST_LIST_SIZE;
 171         BUG_ON(list_empty(&adapter->req_list[i]));
 172
 173         counter = 0;
 174         list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list) {
 175                 if (request->req_id == req_id) {
 176                         dbg_tmp[0] = (u64) atomic_read(&adapter->reqs_active);
 177                         dbg_tmp[1] = (u64) counter;
 178                         debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
 179                         list_del(&request->list);
 180                         break;
 181                 }
 182                 counter++;
 183         }
 184 }
 185
 186 struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *adapter,
 187                                            unsigned long req_id)
 188 {
 189         struct zfcp_fsf_req *request, *tmp;
 190         unsigned int i;
 191
 192         i = req_id % REQUEST_LIST_SIZE;
 193
 194         list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list)
 195                 if (request->req_id == req_id)
 196                         return request;
 197
 198         return NULL;
 199 }
 200
 201 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
 202 {
 203         unsigned int i;
 204
 205         for (i=0; i<REQUEST_LIST_SIZE; i++)
 206                 if (!list_empty(&adapter->req_list[i]))
 207                         return 0;
 208
 209         return 1;
 210 }
 211
 212 #undef ZFCP_LOG_AREA
 213
 214 /****************************************************************/
 215 /************** Uncategorised Functions *************************/
 216 /****************************************************************/
 217
 218 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 219
 220 /**
 221  * zfcp_device_setup - setup function
 222  * @str: pointer to parameter string
 223  *
 224  * Parse "device=..." parameter string.
 225  */
 226 static int __init
 227 zfcp_device_setup(char *devstr)
 228 {
 229         char *tmp, *str;
 230         size_t len;
 231
 232         if (!devstr)
 233                 return 0;
 234
 235         len = strlen(devstr) + 1;
 236         str = (char *) kmalloc(len, GFP_KERNEL);
 237         if (!str)
 238                 goto err_out;
 239         memcpy(str, devstr, len);
 240
 241         tmp = strchr(str, ',');
 242         if (!tmp)
 243                 goto err_out;
 244         *tmp++ = '\0';
 245         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 246         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 247
 248         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 249         if (*tmp++ != ',')
 250                 goto err_out;
 251         if (*tmp == '\0')
 252                 goto err_out;
 253
 254         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 255         if (*tmp != '\0')
 256                 goto err_out;
 257         kfree(str);
 258         return 1;
 259
 260  err_out:
 261         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 262         kfree(str);
 263         return 0;
 264 }
 265
 266 static void __init
 267 zfcp_init_device_configure(void)
 268 {
 269         struct zfcp_adapter *adapter;
 270         struct zfcp_port *port;
 271         struct zfcp_unit *unit;
 272
 273         down(&zfcp_data.config_sema);
 274         read_lock_irq(&zfcp_data.config_lock);
 275         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 276         if (adapter)
 277                 zfcp_adapter_get(adapter);
 278         read_unlock_irq(&zfcp_data.config_lock);
 279
 280         if (adapter == NULL)
 281                 goto out_adapter;
 282         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 283         if (!port)
 284                 goto out_port;
 285         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 286         if (!unit)
 287                 goto out_unit;
 288         up(&zfcp_data.config_sema);
 289         ccw_device_set_online(adapter->ccw_device);
 290         zfcp_erp_wait(adapter);
 291         down(&zfcp_data.config_sema);
 292         zfcp_unit_put(unit);
 293  out_unit:
 294         zfcp_port_put(port);
 295  out_port:
 296         zfcp_adapter_put(adapter);
 297  out_adapter:
 298         up(&zfcp_data.config_sema);
 299         return;
 300 }
 301
 302 static int __init
 303 zfcp_module_init(void)
 304 {
 305
 306         int retval = 0;
 307
 308         atomic_set(&zfcp_data.loglevel, loglevel);
 309
 310         /* initialize adapter list */
 311         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 312
 313         /* initialize adapters to be removed list head */
 314         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 315
 316         zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
 317         if (!zfcp_transport_template)
 318                 return -ENODEV;
 319
 320         retval = misc_register(&zfcp_cfdc_misc);
 321         if (retval != 0) {
 322                 ZFCP_LOG_INFO("registration of misc device "
 323                               "zfcp_cfdc failed\n");
 324                 goto out;
 325         }
 326
 327         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 328                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 329
 330         /* Initialise proc semaphores */
 331         sema_init(&zfcp_data.config_sema, 1);
 332
 333         /* initialise configuration rw lock */
 334         rwlock_init(&zfcp_data.config_lock);
 335
 336         /* save address of data structure managing the driver module */
 337         zfcp_data.scsi_host_template.module = THIS_MODULE;
 338
 339         /* setup dynamic I/O */
 340         retval = zfcp_ccw_register();
 341         if (retval) {
 342                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 343                 goto out_ccw_register;
 344         }
 345
 346         if (zfcp_device_setup(device))
 347                 zfcp_init_device_configure();
 348
 349         goto out;
 350
 351  out_ccw_register:
 352         misc_deregister(&zfcp_cfdc_misc);
 353  out:
 354         return retval;
 355 }
 356
 357 /*
 358  * function:    zfcp_cfdc_dev_ioctl
 359  *
 360  * purpose:     Handle control file upload/download transaction via IOCTL
 361  *              interface
 362  *
 363  * returns:     0           - Operation completed successfuly
 364  *              -ENOTTY     - Unknown IOCTL command
 365  *              -EINVAL     - Invalid sense data record
 366  *              -ENXIO      - The FCP adapter is not available
 367  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 368  *              -ENOMEM     - Insufficient memory
 369  *              -EFAULT     - User space memory I/O operation fault
 370  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 371  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 372  */
 373 static long
 374 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 375                     unsigned long buffer)
 376 {
 377         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
 378         struct zfcp_adapter *adapter = NULL;
 379         struct zfcp_fsf_req *fsf_req = NULL;
 380         struct zfcp_sg_list *sg_list = NULL;
 381         u32 fsf_command, option;
 382         char *bus_id = NULL;
 383         int retval = 0;
 384
 385         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
 386         if (sense_data == NULL) {
 387                 retval = -ENOMEM;
 388                 goto out;
 389         }
 390
 391         sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 392         if (sg_list == NULL) {
 393                 retval = -ENOMEM;
 394                 goto out;
 395         }
 396
 397         if (command != ZFCP_CFDC_IOC) {
 398                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 399                 retval = -ENOTTY;
 400                 goto out;
 401         }
 402
 403         if ((sense_data_user = (void __user *) buffer) == NULL) {
 404                 ZFCP_LOG_INFO("sense data record is required\n");
 405                 retval = -EINVAL;
 406                 goto out;
 407         }
 408
 409         retval = copy_from_user(sense_data, sense_data_user,
 410                                 sizeof(struct zfcp_cfdc_sense_data));
 411         if (retval) {
 412                 retval = -EFAULT;
 413                 goto out;
 414         }
 415
 416         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
 417                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 418                               ZFCP_CFDC_SIGNATURE);
 419                 retval = -EINVAL;
 420                 goto out;
 421         }
 422
 423         switch (sense_data->command) {
 424
 425         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 426                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 427                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 428                 break;
 429
 430         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 431                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 432                 option = FSF_CFDC_OPTION_FORCE;
 433                 break;
 434
 435         case ZFCP_CFDC_CMND_FULL_ACCESS:
 436                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 437                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 438                 break;
 439
 440         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 441                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 442                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 443                 break;
 444
 445         case ZFCP_CFDC_CMND_UPLOAD:
 446                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 447                 option = 0;
 448                 break;
 449
 450         default:
 451                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 452                               sense_data->command);
 453                 retval = -EINVAL;
 454                 goto out;
 455         }
 456
 457         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 458         if (bus_id == NULL) {
 459                 retval = -ENOMEM;
 460                 goto out;
 461         }
 462         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 463                 (sense_data->devno >> 24),
 464                 (sense_data->devno >> 16) & 0xFF,
 465                 (sense_data->devno & 0xFFFF));
 466
 467         read_lock_irq(&zfcp_data.config_lock);
 468         adapter = zfcp_get_adapter_by_busid(bus_id);
 469         if (adapter)
 470                 zfcp_adapter_get(adapter);
 471         read_unlock_irq(&zfcp_data.config_lock);
 472
 473         kfree(bus_id);
 474
 475         if (adapter == NULL) {
 476                 ZFCP_LOG_INFO("invalid adapter\n");
 477                 retval = -ENXIO;
 478                 goto out;
 479         }
 480
 481         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 482                 retval = zfcp_sg_list_alloc(sg_list,
 483                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 484                 if (retval) {
 485                         retval = -ENOMEM;
 486                         goto out;
 487                 }
 488         }
 489
 490         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
 491             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 492                 retval = zfcp_sg_list_copy_from_user(
 493                         sg_list, &sense_data_user->control_file,
 494                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 495                 if (retval) {
 496                         retval = -EFAULT;
 497                         goto out;
 498                 }
 499         }
 500
 501         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
 502                                        option, sg_list);
 503         if (retval)
 504                 goto out;
 505
 506         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 507             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 508                 retval = -ENXIO;
 509                 goto out;
 510         }
 511
 512         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
 513         memcpy(&sense_data->fsf_status_qual,
 514                &fsf_req->qtcb->header.fsf_status_qual,
 515                sizeof(union fsf_status_qual));
 516         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
 517
 518         retval = copy_to_user(sense_data_user, sense_data,
 519                 sizeof(struct zfcp_cfdc_sense_data));
 520         if (retval) {
 521                 retval = -EFAULT;
 522                 goto out;
 523         }
 524
 525         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
 526                 retval = zfcp_sg_list_copy_to_user(
 527                         &sense_data_user->control_file, sg_list,
 528                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 529                 if (retval) {
 530                         retval = -EFAULT;
 531                         goto out;
 532                 }
 533         }
 534
 535  out:
 536         if (fsf_req != NULL)
 537                 zfcp_fsf_req_free(fsf_req);
 538
 539         if ((adapter != NULL) && (retval != -ENXIO))
 540                 zfcp_adapter_put(adapter);
 541
 542         if (sg_list != NULL) {
 543                 zfcp_sg_list_free(sg_list);
 544                 kfree(sg_list);
 545         }
 546
 547         kfree(sense_data);
 548
 549         return retval;
 550 }
 551
 552
 553 /**
 554  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 555  * @sg_list: structure describing a scatter gather list
 556  * @size: size of scatter-gather list
 557  * Return: 0 on success, else -ENOMEM
 558  *
 559  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 560  * or NULL if we run out of memory. sg_list->count specifies the number of
 561  * elements of the scatter-gather list. The maximum size of a single element
 562  * in the scatter-gather list is PAGE_SIZE.
 563  */
 564 static inline int
 565 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 566 {
 567         struct scatterlist *sg;
 568         unsigned int i;
 569         int retval = 0;
 570         void *address;
 571
 572         BUG_ON(sg_list == NULL);
 573
 574         sg_list->count = size >> PAGE_SHIFT;
 575         if (size & ~PAGE_MASK)
 576                 sg_list->count++;
 577         sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
 578                               GFP_KERNEL);
 579         if (sg_list->sg == NULL) {
 580                 sg_list->count = 0;
 581                 retval = -ENOMEM;
 582                 goto out;
 583         }
 584
 585         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 586                 sg->length = min(size, PAGE_SIZE);
 587                 sg->offset = 0;
 588                 address = (void *) get_zeroed_page(GFP_KERNEL);
 589                 if (address == NULL) {
 590                         sg_list->count = i;
 591                         zfcp_sg_list_free(sg_list);
 592                         retval = -ENOMEM;
 593                         goto out;
 594                 }
 595                 zfcp_address_to_sg(address, sg);
 596                 size -= sg->length;
 597         }
 598
 599  out:
 600         return retval;
 601 }
 602
 603
 604 /**
 605  * zfcp_sg_list_free - free memory of a scatter-gather list
 606  * @sg_list: structure describing a scatter-gather list
 607  *
 608  * Memory for each element in the scatter-gather list is freed.
 609  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 610  */
 611 static inline void
 612 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 613 {
 614         struct scatterlist *sg;
 615         unsigned int i;
 616
 617         BUG_ON(sg_list == NULL);
 618
 619         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 620                 free_page((unsigned long) zfcp_sg_to_address(sg));
 621
 622         sg_list->count = 0;
 623         kfree(sg_list->sg);
 624 }
 625
 626 /**
 627  * zfcp_sg_size - determine size of a scatter-gather list
 628  * @sg: array of (struct scatterlist)
 629  * @sg_count: elements in array
 630  * Return: size of entire scatter-gather list
 631  */
 632 size_t
 633 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 634 {
 635         unsigned int i;
 636         struct scatterlist *p;
 637         size_t size;
 638
 639         size = 0;
 640         for (i = 0, p = sg; i < sg_count; i++, p++) {
 641                 BUG_ON(p == NULL);
 642                 size += p->length;
 643         }
 644
 645         return size;
 646 }
 647
 648
 649 /**
 650  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 651  * @sg_list: structure describing a scatter-gather list
 652  * @user_buffer: pointer to buffer in user space
 653  * @size: number of bytes to be copied
 654  * Return: 0 on success, -EFAULT if copy_from_user fails.
 655  */
 656 static inline int
 657 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 658                             void __user *user_buffer,
 659                             size_t size)
 660 {
 661         struct scatterlist *sg;
 662         unsigned int length;
 663         void *zfcp_buffer;
 664         int retval = 0;
 665
 666         BUG_ON(sg_list == NULL);
 667
 668         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 669                 return -EFAULT;
 670
 671         for (sg = sg_list->sg; size > 0; sg++) {
 672                 length = min((unsigned int)size, sg->length);
 673                 zfcp_buffer = zfcp_sg_to_address(sg);
 674                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 675                         retval = -EFAULT;
 676                         goto out;
 677                 }
 678                 user_buffer += length;
 679                 size -= length;
 680         }
 681
 682  out:
 683         return retval;
 684 }
 685
 686
 687 /**
 688  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 689  * @user_buffer: pointer to buffer in user space
 690  * @sg_list: structure describing a scatter-gather list
 691  * @size: number of bytes to be copied
 692  * Return: 0 on success, -EFAULT if copy_to_user fails
 693  */
 694 static inline int
 695 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 696                           struct zfcp_sg_list *sg_list,
 697                           size_t size)
 698 {
 699         struct scatterlist *sg;
 700         unsigned int length;
 701         void *zfcp_buffer;
 702         int retval = 0;
 703
 704         BUG_ON(sg_list == NULL);
 705
 706         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 707                 return -EFAULT;
 708
 709         for (sg = sg_list->sg; size > 0; sg++) {
 710                 length = min((unsigned int) size, sg->length);
 711                 zfcp_buffer = zfcp_sg_to_address(sg);
 712                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 713                         retval = -EFAULT;
 714                         goto out;
 715                 }
 716                 user_buffer += length;
 717                 size -= length;
 718         }
 719
 720  out:
 721         return retval;
 722 }
 723
 724
 725 #undef ZFCP_LOG_AREA
 726
 727 /****************************************************************/
 728 /****** Functions for configuration/set-up of structures ********/
 729 /****************************************************************/
 730
 731 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 732
 733 /**
 734  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 735  * @port: pointer to port to search for unit
 736  * @fcp_lun: FCP LUN to search for
 737  * Traverse list of all units of a port and return pointer to a unit
 738  * with the given FCP LUN.
 739  */
 740 struct zfcp_unit *
 741 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 742 {
 743         struct zfcp_unit *unit;
 744         int found = 0;
 745
 746         list_for_each_entry(unit, &port->unit_list_head, list) {
 747                 if ((unit->fcp_lun == fcp_lun) &&
 748                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 749                 {
 750                         found = 1;
 751                         break;
 752                 }
 753         }
 754         return found ? unit : NULL;
 755 }
 756
 757 /**
 758  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 759  * @adapter: pointer to adapter to search for port
 760  * @wwpn: wwpn to search for
 761  * Traverse list of all ports of an adapter and return pointer to a port
 762  * with the given wwpn.
 763  */
 764 struct zfcp_port *
 765 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 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->wwpn == wwpn) &&
 772                     !(atomic_read(&port->status) &
 773                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 774                         found = 1;
 775                         break;
 776                 }
 777         }
 778         return found ? port : NULL;
 779 }
 780
 781 /**
 782  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 783  * @adapter: pointer to adapter to search for port
 784  * @d_id: d_id to search for
 785  * Traverse list of all ports of an adapter and return pointer to a port
 786  * with the given d_id.
 787  */
 788 struct zfcp_port *
 789 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 790 {
 791         struct zfcp_port *port;
 792         int found = 0;
 793
 794         list_for_each_entry(port, &adapter->port_list_head, list) {
 795                 if ((port->d_id == d_id) &&
 796                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 797                 {
 798                         found = 1;
 799                         break;
 800                 }
 801         }
 802         return found ? port : NULL;
 803 }
 804
 805 /**
 806  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 807  * @bus_id: bus_id to search for
 808  * Traverse list of all adapters and return pointer to an adapter
 809  * with the given bus_id.
 810  */
 811 struct zfcp_adapter *
 812 zfcp_get_adapter_by_busid(char *bus_id)
 813 {
 814         struct zfcp_adapter *adapter;
 815         int found = 0;
 816
 817         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 818                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 819                              BUS_ID_SIZE) == 0) &&
 820                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 821                                       &adapter->status)){
 822                         found = 1;
 823                         break;
 824                 }
 825         }
 826         return found ? adapter : NULL;
 827 }
 828
 829 /**
 830  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 831  * @port: pointer to port where unit is added
 832  * @fcp_lun: FCP LUN of unit to be enqueued
 833  * Return: pointer to enqueued unit on success, NULL on error
 834  * Locks: config_sema must be held to serialize changes to the unit list
 835  *
 836  * Sets up some unit internal structures and creates sysfs entry.
 837  */
 838 struct zfcp_unit *
 839 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 840 {
 841         struct zfcp_unit *unit, *tmp_unit;
 842         unsigned int scsi_lun;
 843         int found;
 844
 845         /*
 846          * check that there is no unit with this FCP_LUN already in list
 847          * and enqueue it.
 848          * Note: Unlike for the adapter and the port, this is an error
 849          */
 850         read_lock_irq(&zfcp_data.config_lock);
 851         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 852         read_unlock_irq(&zfcp_data.config_lock);
 853         if (unit)
 854                 return NULL;
 855
 856         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 857         if (!unit)
 858                 return NULL;
 859
 860         /* initialise reference count stuff */
 861         atomic_set(&unit->refcount, 0);
 862         init_waitqueue_head(&unit->remove_wq);
 863
 864         unit->port = port;
 865         unit->fcp_lun = fcp_lun;
 866
 867         /* setup for sysfs registration */
 868         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 869         unit->sysfs_device.parent = &port->sysfs_device;
 870         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 871         dev_set_drvdata(&unit->sysfs_device, unit);
 872
 873         /* mark unit unusable as long as sysfs registration is not complete */
 874         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 875
 876         if (device_register(&unit->sysfs_device)) {
 877                 kfree(unit);
 878                 return NULL;
 879         }
 880
 881         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 882                 device_unregister(&unit->sysfs_device);
 883                 return NULL;
 884         }
 885
 886         zfcp_unit_get(unit);
 887
 888         scsi_lun = 0;
 889         found = 0;
 890         write_lock_irq(&zfcp_data.config_lock);
 891         list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
 892                 if (tmp_unit->scsi_lun != scsi_lun) {
 893                         found = 1;
 894                         break;
 895                 }
 896                 scsi_lun++;
 897         }
 898         unit->scsi_lun = scsi_lun;
 899         if (found)
 900                 list_add_tail(&unit->list, &tmp_unit->list);
 901         else
 902                 list_add_tail(&unit->list, &port->unit_list_head);
 903         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 904         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 905         write_unlock_irq(&zfcp_data.config_lock);
 906
 907         port->units++;
 908         zfcp_port_get(port);
 909
 910         return unit;
 911 }
 912
 913 void
 914 zfcp_unit_dequeue(struct zfcp_unit *unit)
 915 {
 916         zfcp_unit_wait(unit);
 917         write_lock_irq(&zfcp_data.config_lock);
 918         list_del(&unit->list);
 919         write_unlock_irq(&zfcp_data.config_lock);
 920         unit->port->units--;
 921         zfcp_port_put(unit->port);
 922         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 923         device_unregister(&unit->sysfs_device);
 924 }
 925
 926 /*
 927  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 928  * commands.
 929  * It also genrates fcp-nameserver request/response buffer and unsolicited
 930  * status read fsf_req buffers.
 931  *
 932  * locks:       must only be called with zfcp_data.config_sema taken
 933  */
 934 static int
 935 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 936 {
 937         adapter->pool.fsf_req_erp =
 938                 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 939                                 sizeof(struct zfcp_fsf_req_pool_element));
 940         if (!adapter->pool.fsf_req_erp)
 941                 return -ENOMEM;
 942
 943         adapter->pool.fsf_req_scsi =
 944                 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 945                                 sizeof(struct zfcp_fsf_req_pool_element));
 946         if (!adapter->pool.fsf_req_scsi)
 947                 return -ENOMEM;
 948
 949         adapter->pool.fsf_req_abort =
 950                 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 951                                 sizeof(struct zfcp_fsf_req_pool_element));
 952         if (!adapter->pool.fsf_req_abort)
 953                 return -ENOMEM;
 954
 955         adapter->pool.fsf_req_status_read =
 956                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 957                                             sizeof(struct zfcp_fsf_req));
 958         if (!adapter->pool.fsf_req_status_read)
 959                 return -ENOMEM;
 960
 961         adapter->pool.data_status_read =
 962                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 963                                         sizeof(struct fsf_status_read_buffer));
 964         if (!adapter->pool.data_status_read)
 965                 return -ENOMEM;
 966
 967         adapter->pool.data_gid_pn =
 968                 mempool_create_kmalloc_pool(ZFCP_POOL_DATA_GID_PN_NR,
 969                                             sizeof(struct zfcp_gid_pn_data));
 970         if (!adapter->pool.data_gid_pn)
 971                 return -ENOMEM;
 972
 973         return 0;
 974 }
 975
 976 /**
 977  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 978  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 979  * locking:  zfcp_data.config_sema must be held
 980  */
 981 static void
 982 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 983 {
 984         if (adapter->pool.fsf_req_erp)
 985                 mempool_destroy(adapter->pool.fsf_req_erp);
 986         if (adapter->pool.fsf_req_scsi)
 987                 mempool_destroy(adapter->pool.fsf_req_scsi);
 988         if (adapter->pool.fsf_req_abort)
 989                 mempool_destroy(adapter->pool.fsf_req_abort);
 990         if (adapter->pool.fsf_req_status_read)
 991                 mempool_destroy(adapter->pool.fsf_req_status_read);
 992         if (adapter->pool.data_status_read)
 993                 mempool_destroy(adapter->pool.data_status_read);
 994         if (adapter->pool.data_gid_pn)
 995                 mempool_destroy(adapter->pool.data_gid_pn);
 996 }
 997
 998 void
 999 zfcp_dummy_release(struct device *dev)
1000 {
1001         return;
1002 }
1003
1004 /*
1005  * Enqueues an adapter at the end of the adapter list in the driver data.
1006  * All adapter internal structures are set up.
1007  * Proc-fs entries are also created.
1008  *
1009  * returns:     0             if a new adapter was successfully enqueued
1010  *              ZFCP_KNOWN    if an adapter with this devno was already present
1011  *              -ENOMEM       if alloc failed
1012  * locks:       config_sema must be held to serialise changes to the adapter list
1013  */
1014 struct zfcp_adapter *
1015 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1016 {
1017         int retval = 0;
1018         struct zfcp_adapter *adapter;
1019
1020         /*
1021          * Note: It is safe to release the list_lock, as any list changes
1022          * are protected by the config_sema, which must be held to get here
1023          */
1024
1025         /* try to allocate new adapter data structure (zeroed) */
1026         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1027         if (!adapter) {
1028                 ZFCP_LOG_INFO("error: allocation of base adapter "
1029                               "structure failed\n");
1030                 goto out;
1031         }
1032
1033         ccw_device->handler = NULL;
1034
1035         /* save ccw_device pointer */
1036         adapter->ccw_device = ccw_device;
1037
1038         retval = zfcp_qdio_allocate_queues(adapter);
1039         if (retval)
1040                 goto queues_alloc_failed;
1041
1042         retval = zfcp_qdio_allocate(adapter);
1043         if (retval)
1044                 goto qdio_allocate_failed;
1045
1046         retval = zfcp_allocate_low_mem_buffers(adapter);
1047         if (retval) {
1048                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1049                 goto failed_low_mem_buffers;
1050         }
1051
1052         /* initialise reference count stuff */
1053         atomic_set(&adapter->refcount, 0);
1054         init_waitqueue_head(&adapter->remove_wq);
1055
1056         /* initialise list of ports */
1057         INIT_LIST_HEAD(&adapter->port_list_head);
1058
1059         /* initialise list of ports to be removed */
1060         INIT_LIST_HEAD(&adapter->port_remove_lh);
1061
1062         /* initialize list of fsf requests */
1063         spin_lock_init(&adapter->req_list_lock);
1064         retval = zfcp_reqlist_init(adapter);
1065         if (retval) {
1066                 ZFCP_LOG_INFO("request list initialization failed\n");
1067                 goto failed_low_mem_buffers;
1068         }
1069
1070         /* initialize debug locks */
1071
1072         spin_lock_init(&adapter->erp_dbf_lock);
1073         spin_lock_init(&adapter->hba_dbf_lock);
1074         spin_lock_init(&adapter->san_dbf_lock);
1075         spin_lock_init(&adapter->scsi_dbf_lock);
1076
1077         /* initialize error recovery stuff */
1078
1079         rwlock_init(&adapter->erp_lock);
1080         sema_init(&adapter->erp_ready_sem, 0);
1081         INIT_LIST_HEAD(&adapter->erp_ready_head);
1082         INIT_LIST_HEAD(&adapter->erp_running_head);
1083
1084         /* initialize abort lock */
1085         rwlock_init(&adapter->abort_lock);
1086
1087         /* initialise some erp stuff */
1088         init_waitqueue_head(&adapter->erp_thread_wqh);
1089         init_waitqueue_head(&adapter->erp_done_wqh);
1090
1091         /* initialize lock of associated request queue */
1092         rwlock_init(&adapter->request_queue.queue_lock);
1093
1094         /* intitialise SCSI ER timer */
1095         init_timer(&adapter->scsi_er_timer);
1096
1097         /* mark adapter unusable as long as sysfs registration is not complete */
1098         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1099
1100         adapter->ccw_device = ccw_device;
1101         dev_set_drvdata(&ccw_device->dev, adapter);
1102
1103         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1104                 goto sysfs_failed;
1105
1106         adapter->generic_services.parent = &adapter->ccw_device->dev;
1107         adapter->generic_services.release = zfcp_dummy_release;
1108         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1109                  "generic_services");
1110
1111         if (device_register(&adapter->generic_services))
1112                 goto generic_services_failed;
1113
1114         /* put allocated adapter at list tail */
1115         write_lock_irq(&zfcp_data.config_lock);
1116         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1117         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1118         write_unlock_irq(&zfcp_data.config_lock);
1119
1120         zfcp_data.adapters++;
1121
1122         goto out;
1123
1124  generic_services_failed:
1125         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1126  sysfs_failed:
1127         dev_set_drvdata(&ccw_device->dev, NULL);
1128  failed_low_mem_buffers:
1129         zfcp_free_low_mem_buffers(adapter);
1130         if (qdio_free(ccw_device) != 0)
1131                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1132                                 zfcp_get_busid_by_adapter(adapter));
1133  qdio_allocate_failed:
1134         zfcp_qdio_free_queues(adapter);
1135  queues_alloc_failed:
1136         kfree(adapter);
1137         adapter = NULL;
1138  out:
1139         return adapter;
1140 }
1141
1142 /*
1143  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1144  *              !0 - struct zfcp_adapter  data structure could not be removed
1145  *                      (e.g. still used)
1146  * locks:       adapter list write lock is assumed to be held by caller
1147  */
1148 void
1149 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1150 {
1151         int retval = 0;
1152         unsigned long flags;
1153
1154         device_unregister(&adapter->generic_services);
1155         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1156         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1157         /* sanity check: no pending FSF requests */
1158         spin_lock_irqsave(&adapter->req_list_lock, flags);
1159         retval = zfcp_reqlist_isempty(adapter);
1160         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1161         if (!retval) {
1162                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1163                                 "%i requests outstanding\n",
1164                                 zfcp_get_busid_by_adapter(adapter), adapter,
1165                                 atomic_read(&adapter->reqs_active));
1166                 retval = -EBUSY;
1167                 goto out;
1168         }
1169
1170         /* remove specified adapter data structure from list */
1171         write_lock_irq(&zfcp_data.config_lock);
1172         list_del(&adapter->list);
1173         write_unlock_irq(&zfcp_data.config_lock);
1174
1175         /* decrease number of adapters in list */
1176         zfcp_data.adapters--;
1177
1178         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1179                        "%i adapters still in list\n",
1180                        zfcp_get_busid_by_adapter(adapter),
1181                        adapter, zfcp_data.adapters);
1182
1183         retval = qdio_free(adapter->ccw_device);
1184         if (retval)
1185                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1186                                 zfcp_get_busid_by_adapter(adapter));
1187
1188         zfcp_free_low_mem_buffers(adapter);
1189         /* free memory of adapter data structure and queues */
1190         zfcp_qdio_free_queues(adapter);
1191         zfcp_reqlist_free(adapter);
1192         kfree(adapter->fc_stats);
1193         kfree(adapter->stats_reset_data);
1194         ZFCP_LOG_TRACE("freeing adapter structure\n");
1195         kfree(adapter);
1196  out:
1197         return;
1198 }
1199
1200 /**
1201  * zfcp_port_enqueue - enqueue port to port list of adapter
1202  * @adapter: adapter where remote port is added
1203  * @wwpn: WWPN of the remote port to be enqueued
1204  * @status: initial status for the port
1205  * @d_id: destination id of the remote port to be enqueued
1206  * Return: pointer to enqueued port on success, NULL on error
1207  * Locks: config_sema must be held to serialize changes to the port list
1208  *
1209  * All port internal structures are set up and the sysfs entry is generated.
1210  * d_id is used to enqueue ports with a well known address like the Directory
1211  * Service for nameserver lookup.
1212  */
1213 struct zfcp_port *
1214 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1215                   u32 d_id)
1216 {
1217         struct zfcp_port *port;
1218         int check_wwpn;
1219
1220         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1221         /*
1222          * check that there is no port with this WWPN already in list
1223          */
1224         if (check_wwpn) {
1225                 read_lock_irq(&zfcp_data.config_lock);
1226                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1227                 read_unlock_irq(&zfcp_data.config_lock);
1228                 if (port)
1229                         return NULL;
1230         }
1231
1232         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1233         if (!port)
1234                 return NULL;
1235
1236         /* initialise reference count stuff */
1237         atomic_set(&port->refcount, 0);
1238         init_waitqueue_head(&port->remove_wq);
1239
1240         INIT_LIST_HEAD(&port->unit_list_head);
1241         INIT_LIST_HEAD(&port->unit_remove_lh);
1242
1243         port->adapter = adapter;
1244
1245         if (check_wwpn)
1246                 port->wwpn = wwpn;
1247
1248         atomic_set_mask(status, &port->status);
1249
1250         /* setup for sysfs registration */
1251         if (status & ZFCP_STATUS_PORT_WKA) {
1252                 switch (d_id) {
1253                 case ZFCP_DID_DIRECTORY_SERVICE:
1254                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1255                                  "directory");
1256                         break;
1257                 case ZFCP_DID_MANAGEMENT_SERVICE:
1258                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1259                                  "management");
1260                         break;
1261                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1262                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1263                                  "key_distribution");
1264                         break;
1265                 case ZFCP_DID_ALIAS_SERVICE:
1266                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1267                                  "alias");
1268                         break;
1269                 case ZFCP_DID_TIME_SERVICE:
1270                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1271                                  "time");
1272                         break;
1273                 default:
1274                         kfree(port);
1275                         return NULL;
1276                 }
1277                 port->d_id = d_id;
1278                 port->sysfs_device.parent = &adapter->generic_services;
1279         } else {
1280                 snprintf(port->sysfs_device.bus_id,
1281                          BUS_ID_SIZE, "0x%016llx", wwpn);
1282                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1283         }
1284         port->sysfs_device.release = zfcp_sysfs_port_release;
1285         dev_set_drvdata(&port->sysfs_device, port);
1286
1287         /* mark port unusable as long as sysfs registration is not complete */
1288         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1289
1290         if (device_register(&port->sysfs_device)) {
1291                 kfree(port);
1292                 return NULL;
1293         }
1294
1295         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1296                 device_unregister(&port->sysfs_device);
1297                 return NULL;
1298         }
1299
1300         zfcp_port_get(port);
1301
1302         write_lock_irq(&zfcp_data.config_lock);
1303         list_add_tail(&port->list, &adapter->port_list_head);
1304         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1305         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1306         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1307                 if (!adapter->nameserver_port)
1308                         adapter->nameserver_port = port;
1309         adapter->ports++;
1310         write_unlock_irq(&zfcp_data.config_lock);
1311
1312         zfcp_adapter_get(adapter);
1313
1314         return port;
1315 }
1316
1317 void
1318 zfcp_port_dequeue(struct zfcp_port *port)
1319 {
1320         zfcp_port_wait(port);
1321         write_lock_irq(&zfcp_data.config_lock);
1322         list_del(&port->list);
1323         port->adapter->ports--;
1324         write_unlock_irq(&zfcp_data.config_lock);
1325         if (port->rport)
1326                 fc_remote_port_delete(port->rport);
1327         port->rport = NULL;
1328         zfcp_adapter_put(port->adapter);
1329         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1330                                      atomic_read(&port->status));
1331         device_unregister(&port->sysfs_device);
1332 }
1333
1334 /* Enqueues a nameserver port */
1335 int
1336 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1337 {
1338         struct zfcp_port *port;
1339
1340         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1341                                  ZFCP_DID_DIRECTORY_SERVICE);
1342         if (!port) {
1343                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1344                               "adapter %s failed\n",
1345                               zfcp_get_busid_by_adapter(adapter));
1346                 return -ENXIO;
1347         }
1348         zfcp_port_put(port);
1349
1350         return 0;
1351 }
1352
1353 #undef ZFCP_LOG_AREA
1354
1355 /****************************************************************/
1356 /******* Fibre Channel Standard related Functions  **************/
1357 /****************************************************************/
1358
1359 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1360
1361 void
1362 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1363                            struct fsf_status_read_buffer *status_buffer)
1364 {
1365         struct fcp_rscn_head *fcp_rscn_head;
1366         struct fcp_rscn_element *fcp_rscn_element;
1367         struct zfcp_port *port;
1368         u16 i;
1369         u16 no_entries;
1370         u32 range_mask;
1371         unsigned long flags;
1372
1373         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1374         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1375
1376         /* see FC-FS */
1377         no_entries = (fcp_rscn_head->payload_len / 4);
1378
1379         for (i = 1; i < no_entries; i++) {
1380                 /* skip head and start with 1st element */
1381                 fcp_rscn_element++;
1382                 switch (fcp_rscn_element->addr_format) {
1383                 case ZFCP_PORT_ADDRESS:
1384                         range_mask = ZFCP_PORTS_RANGE_PORT;
1385                         break;
1386                 case ZFCP_AREA_ADDRESS:
1387                         range_mask = ZFCP_PORTS_RANGE_AREA;
1388                         break;
1389                 case ZFCP_DOMAIN_ADDRESS:
1390                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1391                         break;
1392                 case ZFCP_FABRIC_ADDRESS:
1393                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1394                         break;
1395                 default:
1396                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1397                                       "address format\n");
1398                         continue;
1399                 }
1400                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1401                 list_for_each_entry(port, &adapter->port_list_head, list) {
1402                         if (atomic_test_mask
1403                             (ZFCP_STATUS_PORT_WKA, &port->status))
1404                                 continue;
1405                         /* Do we know this port? If not skip it. */
1406                         if (!atomic_test_mask
1407                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1408                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1409                                               "port 0x%016Lx\n", port->wwpn);
1410                                 zfcp_erp_port_reopen(port,
1411                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1412                                 continue;
1413                         }
1414
1415                         /*
1416                          * FIXME: race: d_id might being invalidated
1417                          * (...DID_DID reset)
1418                          */
1419                         if ((port->d_id & range_mask)
1420                             == (fcp_rscn_element->nport_did & range_mask)) {
1421                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1422                                                fcp_rscn_element->nport_did);
1423                                 /*
1424                                  * Unfortunately, an RSCN does not specify the
1425                                  * type of change a target underwent. We assume
1426                                  * that it makes sense to reopen the link.
1427                                  * FIXME: Shall we try to find out more about
1428                                  * the target and link state before closing it?
1429                                  * How to accomplish this? (nameserver?)
1430                                  * Where would such code be put in?
1431                                  * (inside or outside erp)
1432                                  */
1433                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1434                                               "port 0x%016Lx\n", port->wwpn);
1435                                 zfcp_test_link(port);
1436                         }
1437                 }
1438                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1439         }
1440 }
1441
1442 static void
1443 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1444                             struct fsf_status_read_buffer *status_buffer)
1445 {
1446         struct fsf_plogi *els_plogi;
1447         struct zfcp_port *port;
1448         unsigned long flags;
1449
1450         els_plogi = (struct fsf_plogi *) status_buffer->payload;
1451         read_lock_irqsave(&zfcp_data.config_lock, flags);
1452         list_for_each_entry(port, &adapter->port_list_head, list) {
1453                 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1454                         break;
1455         }
1456         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1457
1458         if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1459                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1460                                "with d_id 0x%08x on adapter %s\n",
1461                                status_buffer->d_id,
1462                                zfcp_get_busid_by_adapter(adapter));
1463         } else {
1464                 zfcp_erp_port_forced_reopen(port, 0);
1465         }
1466 }
1467
1468 static void
1469 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1470                            struct fsf_status_read_buffer *status_buffer)
1471 {
1472         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1473         struct zfcp_port *port;
1474         unsigned long flags;
1475
1476         read_lock_irqsave(&zfcp_data.config_lock, flags);
1477         list_for_each_entry(port, &adapter->port_list_head, list) {
1478                 if (port->wwpn == els_logo->nport_wwpn)
1479                         break;
1480         }
1481         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1482
1483         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1484                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1485                                "with d_id 0x%08x on adapter %s\n",
1486                                status_buffer->d_id,
1487                                zfcp_get_busid_by_adapter(adapter));
1488         } else {
1489                 zfcp_erp_port_forced_reopen(port, 0);
1490         }
1491 }
1492
1493 static void
1494 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1495                               struct fsf_status_read_buffer *status_buffer)
1496 {
1497         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1498                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1499                         zfcp_get_busid_by_adapter(adapter));
1500
1501 }
1502
1503 void
1504 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1505 {
1506         struct fsf_status_read_buffer *status_buffer;
1507         u32 els_type;
1508         struct zfcp_adapter *adapter;
1509
1510         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1511         els_type = *(u32 *) (status_buffer->payload);
1512         adapter = fsf_req->adapter;
1513
1514         zfcp_san_dbf_event_incoming_els(fsf_req);
1515         if (els_type == LS_PLOGI)
1516                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1517         else if (els_type == LS_LOGO)
1518                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1519         else if ((els_type & 0xffff0000) == LS_RSCN)
1520                 /* we are only concerned with the command, not the length */
1521                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1522         else
1523                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1524 }
1525
1526
1527 /**
1528  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1529  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1530  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1531  */
1532 static int
1533 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1534 {
1535         struct zfcp_gid_pn_data *data;
1536
1537         if (pool != NULL) {
1538                 data = mempool_alloc(pool, GFP_ATOMIC);
1539                 if (likely(data != NULL)) {
1540                         data->ct.pool = pool;
1541                 }
1542         } else {
1543                 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1544         }
1545
1546         if (NULL == data)
1547                 return -ENOMEM;
1548
1549         memset(data, 0, sizeof(*data));
1550         data->ct.req = &data->req;
1551         data->ct.resp = &data->resp;
1552         data->ct.req_count = data->ct.resp_count = 1;
1553         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1554         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1555         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1556         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1557
1558         *gid_pn = data;
1559         return 0;
1560 }
1561
1562 /**
1563  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1564  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1565  */
1566 static void
1567 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1568 {
1569         if ((gid_pn->ct.pool != 0))
1570                 mempool_free(gid_pn, gid_pn->ct.pool);
1571         else
1572                 kfree(gid_pn);
1573
1574         return;
1575 }
1576
1577 /**
1578  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1579  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1580  */
1581 int
1582 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1583 {
1584         int ret;
1585         struct ct_iu_gid_pn_req *ct_iu_req;
1586         struct zfcp_gid_pn_data *gid_pn;
1587         struct zfcp_adapter *adapter = erp_action->adapter;
1588
1589         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1590         if (ret < 0) {
1591                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1592                               "request failed for adapter %s\n",
1593                               zfcp_get_busid_by_adapter(adapter));
1594                 goto out;
1595         }
1596
1597         /* setup nameserver request */
1598         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1599         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1600         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1601         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1602         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1603         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1604         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1605         ct_iu_req->wwpn = erp_action->port->wwpn;
1606
1607         /* setup parameters for send generic command */
1608         gid_pn->ct.port = adapter->nameserver_port;
1609         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1610         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1611         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1612         gid_pn->ct.timer = &erp_action->timer;
1613         gid_pn->port = erp_action->port;
1614
1615         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1616                                erp_action);
1617         if (ret) {
1618                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1619                               "failed for adapter %s\n",
1620                               zfcp_get_busid_by_adapter(adapter));
1621
1622                 zfcp_gid_pn_buffers_free(gid_pn);
1623         }
1624
1625  out:
1626         return ret;
1627 }
1628
1629 /**
1630  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1631  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1632  */
1633 static void zfcp_ns_gid_pn_handler(unsigned long data)
1634 {
1635         struct zfcp_port *port;
1636         struct zfcp_send_ct *ct;
1637         struct ct_iu_gid_pn_req *ct_iu_req;
1638         struct ct_iu_gid_pn_resp *ct_iu_resp;
1639         struct zfcp_gid_pn_data *gid_pn;
1640
1641
1642         gid_pn = (struct zfcp_gid_pn_data *) data;
1643         port = gid_pn->port;
1644         ct = &gid_pn->ct;
1645         ct_iu_req = zfcp_sg_to_address(ct->req);
1646         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1647
1648         if (ct->status != 0)
1649                 goto failed;
1650
1651         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1652                 /* FIXME: do we need some specific erp entry points */
1653                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1654                 goto failed;
1655         }
1656         /* paranoia */
1657         if (ct_iu_req->wwpn != port->wwpn) {
1658                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1659                                 "lookup does not match expected wwpn 0x%016Lx "
1660                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1661                                 zfcp_get_busid_by_port(port));
1662                 goto mismatch;
1663         }
1664
1665         /* looks like a valid d_id */
1666         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1667         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1668         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%08x\n",
1669                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1670         goto out;
1671
1672  mismatch:
1673         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1674         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1675                       sizeof(struct ct_iu_gid_pn_req));
1676         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1677                       sizeof(struct ct_iu_gid_pn_resp));
1678
1679  failed:
1680         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1681                         "0x%016Lx for adapter %s\n",
1682                         port->wwpn, zfcp_get_busid_by_port(port));
1683  out:
1684         zfcp_gid_pn_buffers_free(gid_pn);
1685         return;
1686 }
1687
1688 /* reject CT_IU reason codes acc. to FC-GS-4 */
1689 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1690         {0x01, "invalid command code"},
1691         {0x02, "invalid version level"},
1692         {0x03, "logical error"},
1693         {0x04, "invalid CT_IU size"},
1694         {0x05, "logical busy"},
1695         {0x07, "protocol error"},
1696         {0x09, "unable to perform command request"},
1697         {0x0b, "command not supported"},
1698         {0x0d, "server not available"},
1699         {0x0e, "session could not be established"},
1700         {0xff, "vendor specific error"},
1701         {0, NULL},
1702 };
1703
1704 /* LS_RJT reason codes acc. to FC-FS */
1705 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1706         {0x01, "invalid LS_Command code"},
1707         {0x03, "logical error"},
1708         {0x05, "logical busy"},
1709         {0x07, "protocol error"},
1710         {0x09, "unable to perform command request"},
1711         {0x0b, "command not supported"},
1712         {0x0e, "command already in progress"},
1713         {0xff, "vendor specific error"},
1714         {0, NULL},
1715 };
1716
1717 /* reject reason codes according to FC-PH/FC-FS */
1718 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1719         {0x01, "invalid D_ID"},
1720         {0x02, "invalid S_ID"},
1721         {0x03, "Nx_Port not available, temporary"},
1722         {0x04, "Nx_Port not available, permament"},
1723         {0x05, "class not supported"},
1724         {0x06, "delimiter usage error"},
1725         {0x07, "TYPE not supported"},
1726         {0x08, "invalid Link_Control"},
1727         {0x09, "invalid R_CTL field"},
1728         {0x0a, "invalid F_CTL field"},
1729         {0x0b, "invalid OX_ID"},
1730         {0x0c, "invalid RX_ID"},
1731         {0x0d, "invalid SEQ_ID"},
1732         {0x0e, "invalid DF_CTL"},
1733         {0x0f, "invalid SEQ_CNT"},
1734         {0x10, "invalid parameter field"},
1735         {0x11, "exchange error"},
1736         {0x12, "protocol error"},
1737         {0x13, "incorrect length"},
1738         {0x14, "unsupported ACK"},
1739         {0x15, "class of service not supported by entity at FFFFFE"},
1740         {0x16, "login required"},
1741         {0x17, "excessive sequences attempted"},
1742         {0x18, "unable to establish exchange"},
1743         {0x1a, "fabric path not available"},
1744         {0x1b, "invalid VC_ID (class 4)"},
1745         {0x1c, "invalid CS_CTL field"},
1746         {0x1d, "insufficient resources for VC (class 4)"},
1747         {0x1f, "invalid class of service"},
1748         {0x20, "preemption request rejected"},
1749         {0x21, "preemption not enabled"},
1750         {0x22, "multicast error"},
1751         {0x23, "multicast error terminate"},
1752         {0x24, "process login required"},
1753         {0xff, "vendor specific reject"},
1754         {0, NULL},
1755 };
1756
1757 /**
1758  * zfcp_rc_description - return description for given reaon code
1759  * @code: reason code
1760  * @rc_table: table of reason codes and descriptions
1761  */
1762 static inline const char *
1763 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1764 {
1765         const char *descr = "unknown reason code";
1766
1767         do {
1768                 if (code == rc_table->code) {
1769                         descr = rc_table->description;
1770                         break;
1771                 }
1772                 rc_table++;
1773         } while (rc_table->code && rc_table->description);
1774
1775         return descr;
1776 }
1777
1778 /**
1779  * zfcp_check_ct_response - evaluate reason code for CT_IU
1780  * @rjt: response payload to an CT_IU request
1781  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1782  */
1783 int
1784 zfcp_check_ct_response(struct ct_hdr *rjt)
1785 {
1786         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1787                 return 0;
1788
1789         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1790                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1791                                 "response code (0x%04hx)\n",
1792                                 rjt->cmd_rsp_code);
1793                 return 1;
1794         }
1795
1796         ZFCP_LOG_INFO("Generic Service command rejected\n");
1797         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1798                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1799                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1800                       (u32) rjt->vendor_unique);
1801
1802         return 1;
1803 }
1804
1805 /**
1806  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1807  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1808  * @rc_table: table of reason codes and descriptions
1809  */
1810 static inline void
1811 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1812                    const struct zfcp_rc_entry *rc_table)
1813 {
1814         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1815                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1816                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1817                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1818 }
1819
1820 /**
1821  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1822  * @sq: status qualifier word
1823  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1824  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1825  */
1826 int
1827 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1828 {
1829         int ret = -EIO;
1830
1831         if (sq == FSF_IOSTAT_NPORT_RJT) {
1832                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1833                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1834                 /* invalid d_id */
1835                 if (rjt_par->reason_code == 0x01)
1836                         ret = -EREMCHG;
1837         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1838                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1839                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1840                 /* invalid d_id */
1841                 if (rjt_par->reason_code == 0x01)
1842                         ret = -EREMCHG;
1843         } else if (sq == FSF_IOSTAT_LS_RJT) {
1844                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1845                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1846                 ret = -EREMOTEIO;
1847         } else
1848                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1849
1850         return ret;
1851 }
1852
1853 /**
1854  * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1855  * into zfcp_port structure
1856  * @port: zfcp_port structure
1857  * @plogi: plogi payload
1858  */
1859 void
1860 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1861 {
1862         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1863                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1864         if (plogi->serv_param.class1_serv_param[0] & 0x80)
1865                 port->supported_classes |= FC_COS_CLASS1;
1866         if (plogi->serv_param.class2_serv_param[0] & 0x80)
1867                 port->supported_classes |= FC_COS_CLASS2;
1868         if (plogi->serv_param.class3_serv_param[0] & 0x80)
1869                 port->supported_classes |= FC_COS_CLASS3;
1870         if (plogi->serv_param.class4_serv_param[0] & 0x80)
1871                 port->supported_classes |= FC_COS_CLASS4;
1872 }
1873
1874 #undef ZFCP_LOG_AREA