SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_aux.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 /*
  23  * Driver authors:
  24  *            Martin Peschke (originator of the driver)
  25  *            Raimund Schroeder
  26  *            Aron Zeh
  27  *            Wolfgang Taphorn
  28  *            Stefan Bader
  29  *            Heiko Carstens (kernel 2.6 port of the driver)
  30  *            Andreas Herrmann
  31  *            Maxim Shchetynin
  32  *            Volker Sameske
  33  *            Ralph Wuerthner
  34  */
  35
  36 #include "zfcp_ext.h"
  37
  38 /* accumulated log level (module parameter) */
  39 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
  40 static char *device;
  41 /*********************** FUNCTION PROTOTYPES *********************************/
  42
  43 /* written against the module interface */
  44 static int __init  zfcp_module_init(void);
  45
  46 /* FCP related */
  47 static void zfcp_ns_gid_pn_handler(unsigned long);
  48
  49 /* miscellaneous */
  50 static 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 /************** Uncategorised Functions *************************/
 117 /****************************************************************/
 118
 119 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 120
 121 /**
 122  * zfcp_device_setup - setup function
 123  * @str: pointer to parameter string
 124  *
 125  * Parse "device=..." parameter string.
 126  */
 127 static int __init
 128 zfcp_device_setup(char *devstr)
 129 {
 130         char *tmp, *str;
 131         size_t len;
 132
 133         if (!devstr)
 134                 return 0;
 135
 136         len = strlen(devstr) + 1;
 137         str = (char *) kmalloc(len, GFP_KERNEL);
 138         if (!str)
 139                 goto err_out;
 140         memcpy(str, devstr, len);
 141
 142         tmp = strchr(str, ',');
 143         if (!tmp)
 144                 goto err_out;
 145         *tmp++ = '\0';
 146         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 147         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 148
 149         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 150         if (*tmp++ != ',')
 151                 goto err_out;
 152         if (*tmp == '\0')
 153                 goto err_out;
 154
 155         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 156         if (*tmp != '\0')
 157                 goto err_out;
 158         kfree(str);
 159         return 1;
 160
 161  err_out:
 162         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 163         kfree(str);
 164         return 0;
 165 }
 166
 167 static void __init
 168 zfcp_init_device_configure(void)
 169 {
 170         struct zfcp_adapter *adapter;
 171         struct zfcp_port *port;
 172         struct zfcp_unit *unit;
 173
 174         down(&zfcp_data.config_sema);
 175         read_lock_irq(&zfcp_data.config_lock);
 176         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 177         if (adapter)
 178                 zfcp_adapter_get(adapter);
 179         read_unlock_irq(&zfcp_data.config_lock);
 180
 181         if (adapter == NULL)
 182                 goto out_adapter;
 183         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 184         if (!port)
 185                 goto out_port;
 186         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 187         if (!unit)
 188                 goto out_unit;
 189         up(&zfcp_data.config_sema);
 190         ccw_device_set_online(adapter->ccw_device);
 191         zfcp_erp_wait(adapter);
 192         down(&zfcp_data.config_sema);
 193         zfcp_unit_put(unit);
 194  out_unit:
 195         zfcp_port_put(port);
 196  out_port:
 197         zfcp_adapter_put(adapter);
 198  out_adapter:
 199         up(&zfcp_data.config_sema);
 200         return;
 201 }
 202
 203 static int __init
 204 zfcp_module_init(void)
 205 {
 206
 207         int retval = 0;
 208
 209         atomic_set(&zfcp_data.loglevel, loglevel);
 210
 211         /* initialize adapter list */
 212         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 213
 214         /* initialize adapters to be removed list head */
 215         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 216
 217         zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
 218         if (!zfcp_transport_template)
 219                 return -ENODEV;
 220
 221         retval = misc_register(&zfcp_cfdc_misc);
 222         if (retval != 0) {
 223                 ZFCP_LOG_INFO("registration of misc device "
 224                               "zfcp_cfdc failed\n");
 225                 goto out;
 226         }
 227
 228         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 229                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 230
 231         /* Initialise proc semaphores */
 232         sema_init(&zfcp_data.config_sema, 1);
 233
 234         /* initialise configuration rw lock */
 235         rwlock_init(&zfcp_data.config_lock);
 236
 237         /* save address of data structure managing the driver module */
 238         zfcp_data.scsi_host_template.module = THIS_MODULE;
 239
 240         /* setup dynamic I/O */
 241         retval = zfcp_ccw_register();
 242         if (retval) {
 243                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 244                 goto out_ccw_register;
 245         }
 246
 247         if (zfcp_device_setup(device))
 248                 zfcp_init_device_configure();
 249
 250         goto out;
 251
 252  out_ccw_register:
 253         misc_deregister(&zfcp_cfdc_misc);
 254  out:
 255         return retval;
 256 }
 257
 258 /*
 259  * function:    zfcp_cfdc_dev_ioctl
 260  *
 261  * purpose:     Handle control file upload/download transaction via IOCTL
 262  *              interface
 263  *
 264  * returns:     0           - Operation completed successfuly
 265  *              -ENOTTY     - Unknown IOCTL command
 266  *              -EINVAL     - Invalid sense data record
 267  *              -ENXIO      - The FCP adapter is not available
 268  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 269  *              -ENOMEM     - Insufficient memory
 270  *              -EFAULT     - User space memory I/O operation fault
 271  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 272  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 273  */
 274 static long
 275 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 276                     unsigned long buffer)
 277 {
 278         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
 279         struct zfcp_adapter *adapter = NULL;
 280         struct zfcp_fsf_req *fsf_req = NULL;
 281         struct zfcp_sg_list *sg_list = NULL;
 282         u32 fsf_command, option;
 283         char *bus_id = NULL;
 284         int retval = 0;
 285
 286         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
 287         if (sense_data == NULL) {
 288                 retval = -ENOMEM;
 289                 goto out;
 290         }
 291
 292         sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 293         if (sg_list == NULL) {
 294                 retval = -ENOMEM;
 295                 goto out;
 296         }
 297
 298         if (command != ZFCP_CFDC_IOC) {
 299                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 300                 retval = -ENOTTY;
 301                 goto out;
 302         }
 303
 304         if ((sense_data_user = (void __user *) buffer) == NULL) {
 305                 ZFCP_LOG_INFO("sense data record is required\n");
 306                 retval = -EINVAL;
 307                 goto out;
 308         }
 309
 310         retval = copy_from_user(sense_data, sense_data_user,
 311                                 sizeof(struct zfcp_cfdc_sense_data));
 312         if (retval) {
 313                 retval = -EFAULT;
 314                 goto out;
 315         }
 316
 317         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
 318                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 319                               ZFCP_CFDC_SIGNATURE);
 320                 retval = -EINVAL;
 321                 goto out;
 322         }
 323
 324         switch (sense_data->command) {
 325
 326         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 327                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 328                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 329                 break;
 330
 331         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 332                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 333                 option = FSF_CFDC_OPTION_FORCE;
 334                 break;
 335
 336         case ZFCP_CFDC_CMND_FULL_ACCESS:
 337                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 338                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 339                 break;
 340
 341         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 342                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 343                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 344                 break;
 345
 346         case ZFCP_CFDC_CMND_UPLOAD:
 347                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 348                 option = 0;
 349                 break;
 350
 351         default:
 352                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 353                               sense_data->command);
 354                 retval = -EINVAL;
 355                 goto out;
 356         }
 357
 358         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 359         if (bus_id == NULL) {
 360                 retval = -ENOMEM;
 361                 goto out;
 362         }
 363         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 364                 (sense_data->devno >> 24),
 365                 (sense_data->devno >> 16) & 0xFF,
 366                 (sense_data->devno & 0xFFFF));
 367
 368         read_lock_irq(&zfcp_data.config_lock);
 369         adapter = zfcp_get_adapter_by_busid(bus_id);
 370         if (adapter)
 371                 zfcp_adapter_get(adapter);
 372         read_unlock_irq(&zfcp_data.config_lock);
 373
 374         kfree(bus_id);
 375
 376         if (adapter == NULL) {
 377                 ZFCP_LOG_INFO("invalid adapter\n");
 378                 retval = -ENXIO;
 379                 goto out;
 380         }
 381
 382         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 383                 retval = zfcp_sg_list_alloc(sg_list,
 384                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 385                 if (retval) {
 386                         retval = -ENOMEM;
 387                         goto out;
 388                 }
 389         }
 390
 391         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
 392             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 393                 retval = zfcp_sg_list_copy_from_user(
 394                         sg_list, &sense_data_user->control_file,
 395                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 396                 if (retval) {
 397                         retval = -EFAULT;
 398                         goto out;
 399                 }
 400         }
 401
 402         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
 403                                        option, sg_list);
 404         if (retval)
 405                 goto out;
 406
 407         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 408             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 409                 retval = -ENXIO;
 410                 goto out;
 411         }
 412
 413         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
 414         memcpy(&sense_data->fsf_status_qual,
 415                &fsf_req->qtcb->header.fsf_status_qual,
 416                sizeof(union fsf_status_qual));
 417         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
 418
 419         retval = copy_to_user(sense_data_user, sense_data,
 420                 sizeof(struct zfcp_cfdc_sense_data));
 421         if (retval) {
 422                 retval = -EFAULT;
 423                 goto out;
 424         }
 425
 426         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
 427                 retval = zfcp_sg_list_copy_to_user(
 428                         &sense_data_user->control_file, sg_list,
 429                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 430                 if (retval) {
 431                         retval = -EFAULT;
 432                         goto out;
 433                 }
 434         }
 435
 436  out:
 437         if (fsf_req != NULL)
 438                 zfcp_fsf_req_free(fsf_req);
 439
 440         if ((adapter != NULL) && (retval != -ENXIO))
 441                 zfcp_adapter_put(adapter);
 442
 443         if (sg_list != NULL) {
 444                 zfcp_sg_list_free(sg_list);
 445                 kfree(sg_list);
 446         }
 447
 448         kfree(sense_data);
 449
 450         return retval;
 451 }
 452
 453
 454 /**
 455  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 456  * @sg_list: structure describing a scatter gather list
 457  * @size: size of scatter-gather list
 458  * Return: 0 on success, else -ENOMEM
 459  *
 460  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 461  * or NULL if we run out of memory. sg_list->count specifies the number of
 462  * elements of the scatter-gather list. The maximum size of a single element
 463  * in the scatter-gather list is PAGE_SIZE.
 464  */
 465 static inline int
 466 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 467 {
 468         struct scatterlist *sg;
 469         unsigned int i;
 470         int retval = 0;
 471         void *address;
 472
 473         BUG_ON(sg_list == NULL);
 474
 475         sg_list->count = size >> PAGE_SHIFT;
 476         if (size & ~PAGE_MASK)
 477                 sg_list->count++;
 478         sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
 479                               GFP_KERNEL);
 480         if (sg_list->sg == NULL) {
 481                 sg_list->count = 0;
 482                 retval = -ENOMEM;
 483                 goto out;
 484         }
 485
 486         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 487                 sg->length = min(size, PAGE_SIZE);
 488                 sg->offset = 0;
 489                 address = (void *) get_zeroed_page(GFP_KERNEL);
 490                 if (address == NULL) {
 491                         sg_list->count = i;
 492                         zfcp_sg_list_free(sg_list);
 493                         retval = -ENOMEM;
 494                         goto out;
 495                 }
 496                 zfcp_address_to_sg(address, sg);
 497                 size -= sg->length;
 498         }
 499
 500  out:
 501         return retval;
 502 }
 503
 504
 505 /**
 506  * zfcp_sg_list_free - free memory of a scatter-gather list
 507  * @sg_list: structure describing a scatter-gather list
 508  *
 509  * Memory for each element in the scatter-gather list is freed.
 510  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 511  */
 512 static inline void
 513 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 514 {
 515         struct scatterlist *sg;
 516         unsigned int i;
 517
 518         BUG_ON(sg_list == NULL);
 519
 520         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 521                 free_page((unsigned long) zfcp_sg_to_address(sg));
 522
 523         sg_list->count = 0;
 524         kfree(sg_list->sg);
 525 }
 526
 527 /**
 528  * zfcp_sg_size - determine size of a scatter-gather list
 529  * @sg: array of (struct scatterlist)
 530  * @sg_count: elements in array
 531  * Return: size of entire scatter-gather list
 532  */
 533 size_t
 534 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 535 {
 536         unsigned int i;
 537         struct scatterlist *p;
 538         size_t size;
 539
 540         size = 0;
 541         for (i = 0, p = sg; i < sg_count; i++, p++) {
 542                 BUG_ON(p == NULL);
 543                 size += p->length;
 544         }
 545
 546         return size;
 547 }
 548
 549
 550 /**
 551  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 552  * @sg_list: structure describing a scatter-gather list
 553  * @user_buffer: pointer to buffer in user space
 554  * @size: number of bytes to be copied
 555  * Return: 0 on success, -EFAULT if copy_from_user fails.
 556  */
 557 static inline int
 558 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 559                             void __user *user_buffer,
 560                             size_t size)
 561 {
 562         struct scatterlist *sg;
 563         unsigned int length;
 564         void *zfcp_buffer;
 565         int retval = 0;
 566
 567         BUG_ON(sg_list == NULL);
 568
 569         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 570                 return -EFAULT;
 571
 572         for (sg = sg_list->sg; size > 0; sg++) {
 573                 length = min((unsigned int)size, sg->length);
 574                 zfcp_buffer = zfcp_sg_to_address(sg);
 575                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 576                         retval = -EFAULT;
 577                         goto out;
 578                 }
 579                 user_buffer += length;
 580                 size -= length;
 581         }
 582
 583  out:
 584         return retval;
 585 }
 586
 587
 588 /**
 589  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 590  * @user_buffer: pointer to buffer in user space
 591  * @sg_list: structure describing a scatter-gather list
 592  * @size: number of bytes to be copied
 593  * Return: 0 on success, -EFAULT if copy_to_user fails
 594  */
 595 static inline int
 596 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 597                           struct zfcp_sg_list *sg_list,
 598                           size_t size)
 599 {
 600         struct scatterlist *sg;
 601         unsigned int length;
 602         void *zfcp_buffer;
 603         int retval = 0;
 604
 605         BUG_ON(sg_list == NULL);
 606
 607         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 608                 return -EFAULT;
 609
 610         for (sg = sg_list->sg; size > 0; sg++) {
 611                 length = min((unsigned int) size, sg->length);
 612                 zfcp_buffer = zfcp_sg_to_address(sg);
 613                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 614                         retval = -EFAULT;
 615                         goto out;
 616                 }
 617                 user_buffer += length;
 618                 size -= length;
 619         }
 620
 621  out:
 622         return retval;
 623 }
 624
 625
 626 #undef ZFCP_LOG_AREA
 627
 628 /****************************************************************/
 629 /****** Functions for configuration/set-up of structures ********/
 630 /****************************************************************/
 631
 632 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 633
 634 /**
 635  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 636  * @port: pointer to port to search for unit
 637  * @fcp_lun: FCP LUN to search for
 638  * Traverse list of all units of a port and return pointer to a unit
 639  * with the given FCP LUN.
 640  */
 641 struct zfcp_unit *
 642 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 643 {
 644         struct zfcp_unit *unit;
 645         int found = 0;
 646
 647         list_for_each_entry(unit, &port->unit_list_head, list) {
 648                 if ((unit->fcp_lun == fcp_lun) &&
 649                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 650                 {
 651                         found = 1;
 652                         break;
 653                 }
 654         }
 655         return found ? unit : NULL;
 656 }
 657
 658 /**
 659  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 660  * @adapter: pointer to adapter to search for port
 661  * @wwpn: wwpn to search for
 662  * Traverse list of all ports of an adapter and return pointer to a port
 663  * with the given wwpn.
 664  */
 665 struct zfcp_port *
 666 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 667 {
 668         struct zfcp_port *port;
 669         int found = 0;
 670
 671         list_for_each_entry(port, &adapter->port_list_head, list) {
 672                 if ((port->wwpn == wwpn) &&
 673                     !(atomic_read(&port->status) &
 674                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 675                         found = 1;
 676                         break;
 677                 }
 678         }
 679         return found ? port : NULL;
 680 }
 681
 682 /**
 683  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 684  * @adapter: pointer to adapter to search for port
 685  * @d_id: d_id to search for
 686  * Traverse list of all ports of an adapter and return pointer to a port
 687  * with the given d_id.
 688  */
 689 struct zfcp_port *
 690 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 691 {
 692         struct zfcp_port *port;
 693         int found = 0;
 694
 695         list_for_each_entry(port, &adapter->port_list_head, list) {
 696                 if ((port->d_id == d_id) &&
 697                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 698                 {
 699                         found = 1;
 700                         break;
 701                 }
 702         }
 703         return found ? port : NULL;
 704 }
 705
 706 /**
 707  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 708  * @bus_id: bus_id to search for
 709  * Traverse list of all adapters and return pointer to an adapter
 710  * with the given bus_id.
 711  */
 712 struct zfcp_adapter *
 713 zfcp_get_adapter_by_busid(char *bus_id)
 714 {
 715         struct zfcp_adapter *adapter;
 716         int found = 0;
 717
 718         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 719                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 720                              BUS_ID_SIZE) == 0) &&
 721                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 722                                       &adapter->status)){
 723                         found = 1;
 724                         break;
 725                 }
 726         }
 727         return found ? adapter : NULL;
 728 }
 729
 730 /**
 731  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 732  * @port: pointer to port where unit is added
 733  * @fcp_lun: FCP LUN of unit to be enqueued
 734  * Return: pointer to enqueued unit on success, NULL on error
 735  * Locks: config_sema must be held to serialize changes to the unit list
 736  *
 737  * Sets up some unit internal structures and creates sysfs entry.
 738  */
 739 struct zfcp_unit *
 740 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 741 {
 742         struct zfcp_unit *unit, *tmp_unit;
 743         scsi_lun_t scsi_lun;
 744         int found;
 745
 746         /*
 747          * check that there is no unit with this FCP_LUN already in list
 748          * and enqueue it.
 749          * Note: Unlike for the adapter and the port, this is an error
 750          */
 751         read_lock_irq(&zfcp_data.config_lock);
 752         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 753         read_unlock_irq(&zfcp_data.config_lock);
 754         if (unit)
 755                 return NULL;
 756
 757         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 758         if (!unit)
 759                 return NULL;
 760
 761         /* initialise reference count stuff */
 762         atomic_set(&unit->refcount, 0);
 763         init_waitqueue_head(&unit->remove_wq);
 764
 765         unit->port = port;
 766         unit->fcp_lun = fcp_lun;
 767
 768         /* setup for sysfs registration */
 769         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 770         unit->sysfs_device.parent = &port->sysfs_device;
 771         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 772         dev_set_drvdata(&unit->sysfs_device, unit);
 773
 774         /* mark unit unusable as long as sysfs registration is not complete */
 775         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 776
 777         if (device_register(&unit->sysfs_device)) {
 778                 kfree(unit);
 779                 return NULL;
 780         }
 781
 782         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 783                 device_unregister(&unit->sysfs_device);
 784                 return NULL;
 785         }
 786
 787         zfcp_unit_get(unit);
 788
 789         scsi_lun = 0;
 790         found = 0;
 791         write_lock_irq(&zfcp_data.config_lock);
 792         list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
 793                 if (tmp_unit->scsi_lun != scsi_lun) {
 794                         found = 1;
 795                         break;
 796                 }
 797                 scsi_lun++;
 798         }
 799         unit->scsi_lun = scsi_lun;
 800         if (found)
 801                 list_add_tail(&unit->list, &tmp_unit->list);
 802         else
 803                 list_add_tail(&unit->list, &port->unit_list_head);
 804         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 805         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 806         write_unlock_irq(&zfcp_data.config_lock);
 807
 808         port->units++;
 809         zfcp_port_get(port);
 810
 811         return unit;
 812 }
 813
 814 void
 815 zfcp_unit_dequeue(struct zfcp_unit *unit)
 816 {
 817         zfcp_unit_wait(unit);
 818         write_lock_irq(&zfcp_data.config_lock);
 819         list_del(&unit->list);
 820         write_unlock_irq(&zfcp_data.config_lock);
 821         unit->port->units--;
 822         zfcp_port_put(unit->port);
 823         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 824         device_unregister(&unit->sysfs_device);
 825 }
 826
 827 /*
 828  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 829  * commands.
 830  * It also genrates fcp-nameserver request/response buffer and unsolicited
 831  * status read fsf_req buffers.
 832  *
 833  * locks:       must only be called with zfcp_data.config_sema taken
 834  */
 835 static int
 836 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 837 {
 838         adapter->pool.fsf_req_erp =
 839                 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 840                                 sizeof(struct zfcp_fsf_req_pool_element));
 841         if (!adapter->pool.fsf_req_erp)
 842                 return -ENOMEM;
 843
 844         adapter->pool.fsf_req_scsi =
 845                 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 846                                 sizeof(struct zfcp_fsf_req_pool_element));
 847         if (!adapter->pool.fsf_req_scsi)
 848                 return -ENOMEM;
 849
 850         adapter->pool.fsf_req_abort =
 851                 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 852                                 sizeof(struct zfcp_fsf_req_pool_element));
 853         if (!adapter->pool.fsf_req_abort)
 854                 return -ENOMEM;
 855
 856         adapter->pool.fsf_req_status_read =
 857                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 858                                             sizeof(struct zfcp_fsf_req));
 859         if (!adapter->pool.fsf_req_status_read)
 860                 return -ENOMEM;
 861
 862         adapter->pool.data_status_read =
 863                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 864                                         sizeof(struct fsf_status_read_buffer));
 865         if (!adapter->pool.data_status_read)
 866                 return -ENOMEM;
 867
 868         adapter->pool.data_gid_pn =
 869                 mempool_create_kmalloc_pool(ZFCP_POOL_DATA_GID_PN_NR,
 870                                             sizeof(struct zfcp_gid_pn_data));
 871         if (!adapter->pool.data_gid_pn)
 872                 return -ENOMEM;
 873
 874         return 0;
 875 }
 876
 877 /**
 878  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 879  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 880  * locking:  zfcp_data.config_sema must be held
 881  */
 882 static void
 883 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 884 {
 885         if (adapter->pool.fsf_req_erp)
 886                 mempool_destroy(adapter->pool.fsf_req_erp);
 887         if (adapter->pool.fsf_req_scsi)
 888                 mempool_destroy(adapter->pool.fsf_req_scsi);
 889         if (adapter->pool.fsf_req_abort)
 890                 mempool_destroy(adapter->pool.fsf_req_abort);
 891         if (adapter->pool.fsf_req_status_read)
 892                 mempool_destroy(adapter->pool.fsf_req_status_read);
 893         if (adapter->pool.data_status_read)
 894                 mempool_destroy(adapter->pool.data_status_read);
 895         if (adapter->pool.data_gid_pn)
 896                 mempool_destroy(adapter->pool.data_gid_pn);
 897 }
 898
 899 void
 900 zfcp_dummy_release(struct device *dev)
 901 {
 902         return;
 903 }
 904
 905 /*
 906  * Enqueues an adapter at the end of the adapter list in the driver data.
 907  * All adapter internal structures are set up.
 908  * Proc-fs entries are also created.
 909  *
 910  * returns:     0             if a new adapter was successfully enqueued
 911  *              ZFCP_KNOWN    if an adapter with this devno was already present
 912  *              -ENOMEM       if alloc failed
 913  * locks:       config_sema must be held to serialise changes to the adapter list
 914  */
 915 struct zfcp_adapter *
 916 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 917 {
 918         int retval = 0;
 919         struct zfcp_adapter *adapter;
 920
 921         /*
 922          * Note: It is safe to release the list_lock, as any list changes
 923          * are protected by the config_sema, which must be held to get here
 924          */
 925
 926         /* try to allocate new adapter data structure (zeroed) */
 927         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
 928         if (!adapter) {
 929                 ZFCP_LOG_INFO("error: allocation of base adapter "
 930                               "structure failed\n");
 931                 goto out;
 932         }
 933
 934         ccw_device->handler = NULL;
 935
 936         /* save ccw_device pointer */
 937         adapter->ccw_device = ccw_device;
 938
 939         retval = zfcp_qdio_allocate_queues(adapter);
 940         if (retval)
 941                 goto queues_alloc_failed;
 942
 943         retval = zfcp_qdio_allocate(adapter);
 944         if (retval)
 945                 goto qdio_allocate_failed;
 946
 947         retval = zfcp_allocate_low_mem_buffers(adapter);
 948         if (retval) {
 949                 ZFCP_LOG_INFO("error: pool allocation failed\n");
 950                 goto failed_low_mem_buffers;
 951         }
 952
 953         /* initialise reference count stuff */
 954         atomic_set(&adapter->refcount, 0);
 955         init_waitqueue_head(&adapter->remove_wq);
 956
 957         /* initialise list of ports */
 958         INIT_LIST_HEAD(&adapter->port_list_head);
 959
 960         /* initialise list of ports to be removed */
 961         INIT_LIST_HEAD(&adapter->port_remove_lh);
 962
 963         /* initialize list of fsf requests */
 964         spin_lock_init(&adapter->fsf_req_list_lock);
 965         INIT_LIST_HEAD(&adapter->fsf_req_list_head);
 966
 967         /* initialize debug locks */
 968
 969         spin_lock_init(&adapter->erp_dbf_lock);
 970         spin_lock_init(&adapter->hba_dbf_lock);
 971         spin_lock_init(&adapter->san_dbf_lock);
 972         spin_lock_init(&adapter->scsi_dbf_lock);
 973
 974         /* initialize error recovery stuff */
 975
 976         rwlock_init(&adapter->erp_lock);
 977         sema_init(&adapter->erp_ready_sem, 0);
 978         INIT_LIST_HEAD(&adapter->erp_ready_head);
 979         INIT_LIST_HEAD(&adapter->erp_running_head);
 980
 981         /* initialize abort lock */
 982         rwlock_init(&adapter->abort_lock);
 983
 984         /* initialise some erp stuff */
 985         init_waitqueue_head(&adapter->erp_thread_wqh);
 986         init_waitqueue_head(&adapter->erp_done_wqh);
 987
 988         /* initialize lock of associated request queue */
 989         rwlock_init(&adapter->request_queue.queue_lock);
 990
 991         /* intitialise SCSI ER timer */
 992         init_timer(&adapter->scsi_er_timer);
 993
 994         /* set FC service class used per default */
 995         adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
 996
 997         sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
 998         ASCEBC(adapter->name, strlen(adapter->name));
 999
1000         /* mark adapter unusable as long as sysfs registration is not complete */
1001         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1002
1003         adapter->ccw_device = ccw_device;
1004         dev_set_drvdata(&ccw_device->dev, adapter);
1005
1006         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1007                 goto sysfs_failed;
1008
1009         adapter->generic_services.parent = &adapter->ccw_device->dev;
1010         adapter->generic_services.release = zfcp_dummy_release;
1011         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1012                  "generic_services");
1013
1014         if (device_register(&adapter->generic_services))
1015                 goto generic_services_failed;
1016
1017         /* put allocated adapter at list tail */
1018         write_lock_irq(&zfcp_data.config_lock);
1019         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1020         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1021         write_unlock_irq(&zfcp_data.config_lock);
1022
1023         zfcp_data.adapters++;
1024
1025         goto out;
1026
1027  generic_services_failed:
1028         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1029  sysfs_failed:
1030         dev_set_drvdata(&ccw_device->dev, NULL);
1031  failed_low_mem_buffers:
1032         zfcp_free_low_mem_buffers(adapter);
1033         if (qdio_free(ccw_device) != 0)
1034                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1035                                 zfcp_get_busid_by_adapter(adapter));
1036  qdio_allocate_failed:
1037         zfcp_qdio_free_queues(adapter);
1038  queues_alloc_failed:
1039         kfree(adapter);
1040         adapter = NULL;
1041  out:
1042         return adapter;
1043 }
1044
1045 /*
1046  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1047  *              !0 - struct zfcp_adapter  data structure could not be removed
1048  *                      (e.g. still used)
1049  * locks:       adapter list write lock is assumed to be held by caller
1050  *              adapter->fsf_req_list_lock is taken and released within this
1051  *              function and must not be held on entry
1052  */
1053 void
1054 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1055 {
1056         int retval = 0;
1057         unsigned long flags;
1058
1059         device_unregister(&adapter->generic_services);
1060         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1061         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1062         /* sanity check: no pending FSF requests */
1063         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1064         retval = !list_empty(&adapter->fsf_req_list_head);
1065         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1066         if (retval) {
1067                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1068                                 "%i requests outstanding\n",
1069                                 zfcp_get_busid_by_adapter(adapter), adapter,
1070                                 atomic_read(&adapter->fsf_reqs_active));
1071                 retval = -EBUSY;
1072                 goto out;
1073         }
1074
1075         /* remove specified adapter data structure from list */
1076         write_lock_irq(&zfcp_data.config_lock);
1077         list_del(&adapter->list);
1078         write_unlock_irq(&zfcp_data.config_lock);
1079
1080         /* decrease number of adapters in list */
1081         zfcp_data.adapters--;
1082
1083         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1084                        "%i adapters still in list\n",
1085                        zfcp_get_busid_by_adapter(adapter),
1086                        adapter, zfcp_data.adapters);
1087
1088         retval = qdio_free(adapter->ccw_device);
1089         if (retval)
1090                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1091                                 zfcp_get_busid_by_adapter(adapter));
1092
1093         zfcp_free_low_mem_buffers(adapter);
1094         /* free memory of adapter data structure and queues */
1095         zfcp_qdio_free_queues(adapter);
1096         kfree(adapter->fc_stats);
1097         kfree(adapter->stats_reset_data);
1098         ZFCP_LOG_TRACE("freeing adapter structure\n");
1099         kfree(adapter);
1100  out:
1101         return;
1102 }
1103
1104 /**
1105  * zfcp_port_enqueue - enqueue port to port list of adapter
1106  * @adapter: adapter where remote port is added
1107  * @wwpn: WWPN of the remote port to be enqueued
1108  * @status: initial status for the port
1109  * @d_id: destination id of the remote port to be enqueued
1110  * Return: pointer to enqueued port on success, NULL on error
1111  * Locks: config_sema must be held to serialize changes to the port list
1112  *
1113  * All port internal structures are set up and the sysfs entry is generated.
1114  * d_id is used to enqueue ports with a well known address like the Directory
1115  * Service for nameserver lookup.
1116  */
1117 struct zfcp_port *
1118 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1119                   u32 d_id)
1120 {
1121         struct zfcp_port *port;
1122         int check_wwpn;
1123
1124         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1125         /*
1126          * check that there is no port with this WWPN already in list
1127          */
1128         if (check_wwpn) {
1129                 read_lock_irq(&zfcp_data.config_lock);
1130                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1131                 read_unlock_irq(&zfcp_data.config_lock);
1132                 if (port)
1133                         return NULL;
1134         }
1135
1136         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1137         if (!port)
1138                 return NULL;
1139
1140         /* initialise reference count stuff */
1141         atomic_set(&port->refcount, 0);
1142         init_waitqueue_head(&port->remove_wq);
1143
1144         INIT_LIST_HEAD(&port->unit_list_head);
1145         INIT_LIST_HEAD(&port->unit_remove_lh);
1146
1147         port->adapter = adapter;
1148
1149         if (check_wwpn)
1150                 port->wwpn = wwpn;
1151
1152         atomic_set_mask(status, &port->status);
1153
1154         /* setup for sysfs registration */
1155         if (status & ZFCP_STATUS_PORT_WKA) {
1156                 switch (d_id) {
1157                 case ZFCP_DID_DIRECTORY_SERVICE:
1158                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1159                                  "directory");
1160                         break;
1161                 case ZFCP_DID_MANAGEMENT_SERVICE:
1162                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1163                                  "management");
1164                         break;
1165                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1166                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1167                                  "key_distribution");
1168                         break;
1169                 case ZFCP_DID_ALIAS_SERVICE:
1170                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1171                                  "alias");
1172                         break;
1173                 case ZFCP_DID_TIME_SERVICE:
1174                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1175                                  "time");
1176                         break;
1177                 default:
1178                         kfree(port);
1179                         return NULL;
1180                 }
1181                 port->d_id = d_id;
1182                 port->sysfs_device.parent = &adapter->generic_services;
1183         } else {
1184                 snprintf(port->sysfs_device.bus_id,
1185                          BUS_ID_SIZE, "0x%016llx", wwpn);
1186                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1187         }
1188         port->sysfs_device.release = zfcp_sysfs_port_release;
1189         dev_set_drvdata(&port->sysfs_device, port);
1190
1191         /* mark port unusable as long as sysfs registration is not complete */
1192         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1193
1194         if (device_register(&port->sysfs_device)) {
1195                 kfree(port);
1196                 return NULL;
1197         }
1198
1199         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1200                 device_unregister(&port->sysfs_device);
1201                 return NULL;
1202         }
1203
1204         zfcp_port_get(port);
1205
1206         write_lock_irq(&zfcp_data.config_lock);
1207         list_add_tail(&port->list, &adapter->port_list_head);
1208         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1209         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1210         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1211                 if (!adapter->nameserver_port)
1212                         adapter->nameserver_port = port;
1213         adapter->ports++;
1214         write_unlock_irq(&zfcp_data.config_lock);
1215
1216         zfcp_adapter_get(adapter);
1217
1218         return port;
1219 }
1220
1221 void
1222 zfcp_port_dequeue(struct zfcp_port *port)
1223 {
1224         zfcp_port_wait(port);
1225         write_lock_irq(&zfcp_data.config_lock);
1226         list_del(&port->list);
1227         port->adapter->ports--;
1228         write_unlock_irq(&zfcp_data.config_lock);
1229         if (port->rport)
1230                 fc_remote_port_delete(port->rport);
1231         port->rport = NULL;
1232         zfcp_adapter_put(port->adapter);
1233         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1234                                      atomic_read(&port->status));
1235         device_unregister(&port->sysfs_device);
1236 }
1237
1238 /* Enqueues a nameserver port */
1239 int
1240 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1241 {
1242         struct zfcp_port *port;
1243
1244         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1245                                  ZFCP_DID_DIRECTORY_SERVICE);
1246         if (!port) {
1247                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1248                               "adapter %s failed\n",
1249                               zfcp_get_busid_by_adapter(adapter));
1250                 return -ENXIO;
1251         }
1252         zfcp_port_put(port);
1253
1254         return 0;
1255 }
1256
1257 #undef ZFCP_LOG_AREA
1258
1259 /****************************************************************/
1260 /******* Fibre Channel Standard related Functions  **************/
1261 /****************************************************************/
1262
1263 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1264
1265 void
1266 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1267                            struct fsf_status_read_buffer *status_buffer)
1268 {
1269         struct fcp_rscn_head *fcp_rscn_head;
1270         struct fcp_rscn_element *fcp_rscn_element;
1271         struct zfcp_port *port;
1272         u16 i;
1273         u16 no_entries;
1274         u32 range_mask;
1275         unsigned long flags;
1276
1277         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1278         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1279
1280         /* see FC-FS */
1281         no_entries = (fcp_rscn_head->payload_len / 4);
1282
1283         for (i = 1; i < no_entries; i++) {
1284                 /* skip head and start with 1st element */
1285                 fcp_rscn_element++;
1286                 switch (fcp_rscn_element->addr_format) {
1287                 case ZFCP_PORT_ADDRESS:
1288                         range_mask = ZFCP_PORTS_RANGE_PORT;
1289                         break;
1290                 case ZFCP_AREA_ADDRESS:
1291                         range_mask = ZFCP_PORTS_RANGE_AREA;
1292                         break;
1293                 case ZFCP_DOMAIN_ADDRESS:
1294                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1295                         break;
1296                 case ZFCP_FABRIC_ADDRESS:
1297                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1298                         break;
1299                 default:
1300                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1301                                       "address format\n");
1302                         continue;
1303                 }
1304                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1305                 list_for_each_entry(port, &adapter->port_list_head, list) {
1306                         if (atomic_test_mask
1307                             (ZFCP_STATUS_PORT_WKA, &port->status))
1308                                 continue;
1309                         /* Do we know this port? If not skip it. */
1310                         if (!atomic_test_mask
1311                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1312                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1313                                               "port 0x%016Lx\n", port->wwpn);
1314                                 zfcp_erp_port_reopen(port,
1315                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1316                                 continue;
1317                         }
1318
1319                         /*
1320                          * FIXME: race: d_id might being invalidated
1321                          * (...DID_DID reset)
1322                          */
1323                         if ((port->d_id & range_mask)
1324                             == (fcp_rscn_element->nport_did & range_mask)) {
1325                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1326                                                fcp_rscn_element->nport_did);
1327                                 /*
1328                                  * Unfortunately, an RSCN does not specify the
1329                                  * type of change a target underwent. We assume
1330                                  * that it makes sense to reopen the link.
1331                                  * FIXME: Shall we try to find out more about
1332                                  * the target and link state before closing it?
1333                                  * How to accomplish this? (nameserver?)
1334                                  * Where would such code be put in?
1335                                  * (inside or outside erp)
1336                                  */
1337                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1338                                               "port 0x%016Lx\n", port->wwpn);
1339                                 zfcp_test_link(port);
1340                         }
1341                 }
1342                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1343         }
1344 }
1345
1346 static void
1347 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1348                             struct fsf_status_read_buffer *status_buffer)
1349 {
1350         logi *els_logi = (logi *) status_buffer->payload;
1351         struct zfcp_port *port;
1352         unsigned long flags;
1353
1354         read_lock_irqsave(&zfcp_data.config_lock, flags);
1355         list_for_each_entry(port, &adapter->port_list_head, list) {
1356                 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1357                         break;
1358         }
1359         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1360
1361         if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1362                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1363                                "with d_id 0x%08x on adapter %s\n",
1364                                status_buffer->d_id,
1365                                zfcp_get_busid_by_adapter(adapter));
1366         } else {
1367                 zfcp_erp_port_forced_reopen(port, 0);
1368         }
1369 }
1370
1371 static void
1372 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1373                            struct fsf_status_read_buffer *status_buffer)
1374 {
1375         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1376         struct zfcp_port *port;
1377         unsigned long flags;
1378
1379         read_lock_irqsave(&zfcp_data.config_lock, flags);
1380         list_for_each_entry(port, &adapter->port_list_head, list) {
1381                 if (port->wwpn == els_logo->nport_wwpn)
1382                         break;
1383         }
1384         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1385
1386         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1387                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1388                                "with d_id 0x%08x on adapter %s\n",
1389                                status_buffer->d_id,
1390                                zfcp_get_busid_by_adapter(adapter));
1391         } else {
1392                 zfcp_erp_port_forced_reopen(port, 0);
1393         }
1394 }
1395
1396 static void
1397 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1398                               struct fsf_status_read_buffer *status_buffer)
1399 {
1400         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1401                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1402                         zfcp_get_busid_by_adapter(adapter));
1403
1404 }
1405
1406 void
1407 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1408 {
1409         struct fsf_status_read_buffer *status_buffer;
1410         u32 els_type;
1411         struct zfcp_adapter *adapter;
1412
1413         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1414         els_type = *(u32 *) (status_buffer->payload);
1415         adapter = fsf_req->adapter;
1416
1417         zfcp_san_dbf_event_incoming_els(fsf_req);
1418         if (els_type == LS_PLOGI)
1419                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1420         else if (els_type == LS_LOGO)
1421                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1422         else if ((els_type & 0xffff0000) == LS_RSCN)
1423                 /* we are only concerned with the command, not the length */
1424                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1425         else
1426                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1427 }
1428
1429
1430 /**
1431  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1432  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1433  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1434  */
1435 static int
1436 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1437 {
1438         struct zfcp_gid_pn_data *data;
1439
1440         if (pool != NULL) {
1441                 data = mempool_alloc(pool, GFP_ATOMIC);
1442                 if (likely(data != NULL)) {
1443                         data->ct.pool = pool;
1444                 }
1445         } else {
1446                 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1447         }
1448
1449         if (NULL == data)
1450                 return -ENOMEM;
1451
1452         memset(data, 0, sizeof(*data));
1453         data->ct.req = &data->req;
1454         data->ct.resp = &data->resp;
1455         data->ct.req_count = data->ct.resp_count = 1;
1456         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1457         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1458         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1459         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1460
1461         *gid_pn = data;
1462         return 0;
1463 }
1464
1465 /**
1466  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1467  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1468  */
1469 static void
1470 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1471 {
1472         if ((gid_pn->ct.pool != 0))
1473                 mempool_free(gid_pn, gid_pn->ct.pool);
1474         else
1475                 kfree(gid_pn);
1476
1477         return;
1478 }
1479
1480 /**
1481  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1482  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1483  */
1484 int
1485 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1486 {
1487         int ret;
1488         struct ct_iu_gid_pn_req *ct_iu_req;
1489         struct zfcp_gid_pn_data *gid_pn;
1490         struct zfcp_adapter *adapter = erp_action->adapter;
1491
1492         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1493         if (ret < 0) {
1494                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1495                               "request failed for adapter %s\n",
1496                               zfcp_get_busid_by_adapter(adapter));
1497                 goto out;
1498         }
1499
1500         /* setup nameserver request */
1501         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1502         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1503         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1504         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1505         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1506         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1507         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1508         ct_iu_req->wwpn = erp_action->port->wwpn;
1509
1510         /* setup parameters for send generic command */
1511         gid_pn->ct.port = adapter->nameserver_port;
1512         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1513         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1514         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1515         gid_pn->ct.timer = &erp_action->timer;
1516         gid_pn->port = erp_action->port;
1517
1518         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1519                                erp_action);
1520         if (ret) {
1521                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1522                               "failed for adapter %s\n",
1523                               zfcp_get_busid_by_adapter(adapter));
1524
1525                 zfcp_gid_pn_buffers_free(gid_pn);
1526         }
1527
1528  out:
1529         return ret;
1530 }
1531
1532 /**
1533  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1534  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1535  */
1536 static void zfcp_ns_gid_pn_handler(unsigned long data)
1537 {
1538         struct zfcp_port *port;
1539         struct zfcp_send_ct *ct;
1540         struct ct_iu_gid_pn_req *ct_iu_req;
1541         struct ct_iu_gid_pn_resp *ct_iu_resp;
1542         struct zfcp_gid_pn_data *gid_pn;
1543
1544
1545         gid_pn = (struct zfcp_gid_pn_data *) data;
1546         port = gid_pn->port;
1547         ct = &gid_pn->ct;
1548         ct_iu_req = zfcp_sg_to_address(ct->req);
1549         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1550
1551         if (ct->status != 0)
1552                 goto failed;
1553
1554         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1555                 /* FIXME: do we need some specific erp entry points */
1556                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1557                 goto failed;
1558         }
1559         /* paranoia */
1560         if (ct_iu_req->wwpn != port->wwpn) {
1561                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1562                                 "lookup does not match expected wwpn 0x%016Lx "
1563                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1564                                 zfcp_get_busid_by_port(port));
1565                 goto mismatch;
1566         }
1567
1568         /* looks like a valid d_id */
1569         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1570         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1571         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%08x\n",
1572                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1573         goto out;
1574
1575  mismatch:
1576         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1577         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1578                       sizeof(struct ct_iu_gid_pn_req));
1579         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1580                       sizeof(struct ct_iu_gid_pn_resp));
1581
1582  failed:
1583         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1584                         "0x%016Lx for adapter %s\n",
1585                         port->wwpn, zfcp_get_busid_by_port(port));
1586  out:
1587         zfcp_gid_pn_buffers_free(gid_pn);
1588         return;
1589 }
1590
1591 /* reject CT_IU reason codes acc. to FC-GS-4 */
1592 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1593         {0x01, "invalid command code"},
1594         {0x02, "invalid version level"},
1595         {0x03, "logical error"},
1596         {0x04, "invalid CT_IU size"},
1597         {0x05, "logical busy"},
1598         {0x07, "protocol error"},
1599         {0x09, "unable to perform command request"},
1600         {0x0b, "command not supported"},
1601         {0x0d, "server not available"},
1602         {0x0e, "session could not be established"},
1603         {0xff, "vendor specific error"},
1604         {0, NULL},
1605 };
1606
1607 /* LS_RJT reason codes acc. to FC-FS */
1608 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1609         {0x01, "invalid LS_Command code"},
1610         {0x03, "logical error"},
1611         {0x05, "logical busy"},
1612         {0x07, "protocol error"},
1613         {0x09, "unable to perform command request"},
1614         {0x0b, "command not supported"},
1615         {0x0e, "command already in progress"},
1616         {0xff, "vendor specific error"},
1617         {0, NULL},
1618 };
1619
1620 /* reject reason codes according to FC-PH/FC-FS */
1621 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1622         {0x01, "invalid D_ID"},
1623         {0x02, "invalid S_ID"},
1624         {0x03, "Nx_Port not available, temporary"},
1625         {0x04, "Nx_Port not available, permament"},
1626         {0x05, "class not supported"},
1627         {0x06, "delimiter usage error"},
1628         {0x07, "TYPE not supported"},
1629         {0x08, "invalid Link_Control"},
1630         {0x09, "invalid R_CTL field"},
1631         {0x0a, "invalid F_CTL field"},
1632         {0x0b, "invalid OX_ID"},
1633         {0x0c, "invalid RX_ID"},
1634         {0x0d, "invalid SEQ_ID"},
1635         {0x0e, "invalid DF_CTL"},
1636         {0x0f, "invalid SEQ_CNT"},
1637         {0x10, "invalid parameter field"},
1638         {0x11, "exchange error"},
1639         {0x12, "protocol error"},
1640         {0x13, "incorrect length"},
1641         {0x14, "unsupported ACK"},
1642         {0x15, "class of service not supported by entity at FFFFFE"},
1643         {0x16, "login required"},
1644         {0x17, "excessive sequences attempted"},
1645         {0x18, "unable to establish exchange"},
1646         {0x1a, "fabric path not available"},
1647         {0x1b, "invalid VC_ID (class 4)"},
1648         {0x1c, "invalid CS_CTL field"},
1649         {0x1d, "insufficient resources for VC (class 4)"},
1650         {0x1f, "invalid class of service"},
1651         {0x20, "preemption request rejected"},
1652         {0x21, "preemption not enabled"},
1653         {0x22, "multicast error"},
1654         {0x23, "multicast error terminate"},
1655         {0x24, "process login required"},
1656         {0xff, "vendor specific reject"},
1657         {0, NULL},
1658 };
1659
1660 /**
1661  * zfcp_rc_description - return description for given reaon code
1662  * @code: reason code
1663  * @rc_table: table of reason codes and descriptions
1664  */
1665 static inline const char *
1666 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1667 {
1668         const char *descr = "unknown reason code";
1669
1670         do {
1671                 if (code == rc_table->code) {
1672                         descr = rc_table->description;
1673                         break;
1674                 }
1675                 rc_table++;
1676         } while (rc_table->code && rc_table->description);
1677
1678         return descr;
1679 }
1680
1681 /**
1682  * zfcp_check_ct_response - evaluate reason code for CT_IU
1683  * @rjt: response payload to an CT_IU request
1684  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1685  */
1686 int
1687 zfcp_check_ct_response(struct ct_hdr *rjt)
1688 {
1689         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1690                 return 0;
1691
1692         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1693                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1694                                 "response code (0x%04hx)\n",
1695                                 rjt->cmd_rsp_code);
1696                 return 1;
1697         }
1698
1699         ZFCP_LOG_INFO("Generic Service command rejected\n");
1700         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1701                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1702                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1703                       (u32) rjt->vendor_unique);
1704
1705         return 1;
1706 }
1707
1708 /**
1709  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1710  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1711  * @rc_table: table of reason codes and descriptions
1712  */
1713 static inline void
1714 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1715                    const struct zfcp_rc_entry *rc_table)
1716 {
1717         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1718                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1719                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1720                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1721 }
1722
1723 /**
1724  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1725  * @sq: status qualifier word
1726  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1727  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1728  */
1729 int
1730 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1731 {
1732         int ret = -EIO;
1733
1734         if (sq == FSF_IOSTAT_NPORT_RJT) {
1735                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1736                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1737                 /* invalid d_id */
1738                 if (rjt_par->reason_code == 0x01)
1739                         ret = -EREMCHG;
1740         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1741                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1742                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1743                 /* invalid d_id */
1744                 if (rjt_par->reason_code == 0x01)
1745                         ret = -EREMCHG;
1746         } else if (sq == FSF_IOSTAT_LS_RJT) {
1747                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1748                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1749                 ret = -EREMOTEIO;
1750         } else
1751                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1752
1753         return ret;
1754 }
1755
1756 #undef ZFCP_LOG_AREA