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   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_aux.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *            Andreas Herrmann <aherrman@de.ibm.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2, or (at your option)
  20  * any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #include "zfcp_ext.h"
  33
  34 /* accumulated log level (module parameter) */
  35 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
  36 static char *device;
  37 /*********************** FUNCTION PROTOTYPES *********************************/
  38
  39 /* written against the module interface */
  40 static int __init  zfcp_module_init(void);
  41
  42 /* FCP related */
  43 static void zfcp_ns_gid_pn_handler(unsigned long);
  44
  45 /* miscellaneous */
  46 static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
  47 static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
  48 static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
  49                                               void __user *, size_t);
  50 static inline int zfcp_sg_list_copy_to_user(void __user *,
  51                                             struct zfcp_sg_list *, size_t);
  52
  53 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
  54
  55 #define ZFCP_CFDC_IOC_MAGIC                     0xDD
  56 #define ZFCP_CFDC_IOC \
  57         _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
  58
  59
  60 static struct file_operations zfcp_cfdc_fops = {
  61         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
  62 #ifdef CONFIG_COMPAT
  63         .compat_ioctl = zfcp_cfdc_dev_ioctl
  64 #endif
  65 };
  66
  67 static struct miscdevice zfcp_cfdc_misc = {
  68         .minor = ZFCP_CFDC_DEV_MINOR,
  69         .name = ZFCP_CFDC_DEV_NAME,
  70         .fops = &zfcp_cfdc_fops
  71 };
  72
  73 /*********************** KERNEL/MODULE PARAMETERS  ***************************/
  74
  75 /* declare driver module init/cleanup functions */
  76 module_init(zfcp_module_init);
  77
  78 MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
  79               "Andreas Herrman <aherrman@de.ibm.com>, "
  80               "Martin Peschke <mpeschke@de.ibm.com>, "
  81               "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
  82               "Wolfgang Taphorn <taphorn@de.ibm.com>, "
  83               "Aron Zeh <arzeh@de.ibm.com>, "
  84               "IBM Deutschland Entwicklung GmbH");
  85 MODULE_DESCRIPTION
  86     ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
  87 MODULE_LICENSE("GPL");
  88
  89 module_param(device, charp, 0400);
  90 MODULE_PARM_DESC(device, "specify initial device");
  91
  92 module_param(loglevel, uint, 0400);
  93 MODULE_PARM_DESC(loglevel,
  94                  "log levels, 8 nibbles: "
  95                  "FC ERP QDIO CIO Config FSF SCSI Other, "
  96                  "levels: 0=none 1=normal 2=devel 3=trace");
  97
  98 /****************************************************************/
  99 /************** Functions without logging ***********************/
 100 /****************************************************************/
 101
 102 void
 103 _zfcp_hex_dump(char *addr, int count)
 104 {
 105         int i;
 106         for (i = 0; i < count; i++) {
 107                 printk("%02x", addr[i]);
 108                 if ((i % 4) == 3)
 109                         printk(" ");
 110                 if ((i % 32) == 31)
 111                         printk("\n");
 112         }
 113         if (((i-1) % 32) != 31)
 114                 printk("\n");
 115 }
 116
 117 /****************************************************************/
 118 /************** Uncategorised Functions *************************/
 119 /****************************************************************/
 120
 121 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 122
 123 /**
 124  * zfcp_device_setup - setup function
 125  * @str: pointer to parameter string
 126  *
 127  * Parse "device=..." parameter string.
 128  */
 129 static int __init
 130 zfcp_device_setup(char *devstr)
 131 {
 132         char *tmp, *str;
 133         size_t len;
 134
 135         if (!devstr)
 136                 return 0;
 137
 138         len = strlen(devstr) + 1;
 139         str = (char *) kmalloc(len, GFP_KERNEL);
 140         if (!str)
 141                 goto err_out;
 142         memcpy(str, devstr, len);
 143
 144         tmp = strchr(str, ',');
 145         if (!tmp)
 146                 goto err_out;
 147         *tmp++ = '\0';
 148         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 149         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 150
 151         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 152         if (*tmp++ != ',')
 153                 goto err_out;
 154         if (*tmp == '\0')
 155                 goto err_out;
 156
 157         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 158         if (*tmp != '\0')
 159                 goto err_out;
 160         kfree(str);
 161         return 1;
 162
 163  err_out:
 164         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 165         kfree(str);
 166         return 0;
 167 }
 168
 169 static void __init
 170 zfcp_init_device_configure(void)
 171 {
 172         struct zfcp_adapter *adapter;
 173         struct zfcp_port *port;
 174         struct zfcp_unit *unit;
 175
 176         down(&zfcp_data.config_sema);
 177         read_lock_irq(&zfcp_data.config_lock);
 178         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 179         if (adapter)
 180                 zfcp_adapter_get(adapter);
 181         read_unlock_irq(&zfcp_data.config_lock);
 182
 183         if (adapter == NULL)
 184                 goto out_adapter;
 185         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 186         if (!port)
 187                 goto out_port;
 188         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 189         if (!unit)
 190                 goto out_unit;
 191         up(&zfcp_data.config_sema);
 192         ccw_device_set_online(adapter->ccw_device);
 193         zfcp_erp_wait(adapter);
 194         down(&zfcp_data.config_sema);
 195         zfcp_unit_put(unit);
 196  out_unit:
 197         zfcp_port_put(port);
 198  out_port:
 199         zfcp_adapter_put(adapter);
 200  out_adapter:
 201         up(&zfcp_data.config_sema);
 202         return;
 203 }
 204
 205 static int __init
 206 zfcp_module_init(void)
 207 {
 208
 209         int retval = 0;
 210
 211         atomic_set(&zfcp_data.loglevel, loglevel);
 212
 213         /* initialize adapter list */
 214         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 215
 216         /* initialize adapters to be removed list head */
 217         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 218
 219         zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
 220         if (!zfcp_transport_template)
 221                 return -ENODEV;
 222
 223         retval = misc_register(&zfcp_cfdc_misc);
 224         if (retval != 0) {
 225                 ZFCP_LOG_INFO("registration of misc device "
 226                               "zfcp_cfdc failed\n");
 227                 goto out;
 228         }
 229
 230         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 231                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 232
 233         /* Initialise proc semaphores */
 234         sema_init(&zfcp_data.config_sema, 1);
 235
 236         /* initialise configuration rw lock */
 237         rwlock_init(&zfcp_data.config_lock);
 238
 239         /* save address of data structure managing the driver module */
 240         zfcp_data.scsi_host_template.module = THIS_MODULE;
 241
 242         /* setup dynamic I/O */
 243         retval = zfcp_ccw_register();
 244         if (retval) {
 245                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 246                 goto out_ccw_register;
 247         }
 248
 249         if (zfcp_device_setup(device))
 250                 zfcp_init_device_configure();
 251
 252         goto out;
 253
 254  out_ccw_register:
 255         misc_deregister(&zfcp_cfdc_misc);
 256  out:
 257         return retval;
 258 }
 259
 260 /*
 261  * function:    zfcp_cfdc_dev_ioctl
 262  *
 263  * purpose:     Handle control file upload/download transaction via IOCTL
 264  *              interface
 265  *
 266  * returns:     0           - Operation completed successfuly
 267  *              -ENOTTY     - Unknown IOCTL command
 268  *              -EINVAL     - Invalid sense data record
 269  *              -ENXIO      - The FCP adapter is not available
 270  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 271  *              -ENOMEM     - Insufficient memory
 272  *              -EFAULT     - User space memory I/O operation fault
 273  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 274  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 275  */
 276 static long
 277 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 278                     unsigned long buffer)
 279 {
 280         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
 281         struct zfcp_adapter *adapter = NULL;
 282         struct zfcp_fsf_req *fsf_req = NULL;
 283         struct zfcp_sg_list *sg_list = NULL;
 284         u32 fsf_command, option;
 285         char *bus_id = NULL;
 286         int retval = 0;
 287
 288         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
 289         if (sense_data == NULL) {
 290                 retval = -ENOMEM;
 291                 goto out;
 292         }
 293
 294         sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 295         if (sg_list == NULL) {
 296                 retval = -ENOMEM;
 297                 goto out;
 298         }
 299         memset(sg_list, 0, sizeof(*sg_list));
 300
 301         if (command != ZFCP_CFDC_IOC) {
 302                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 303                 retval = -ENOTTY;
 304                 goto out;
 305         }
 306
 307         if ((sense_data_user = (void __user *) buffer) == NULL) {
 308                 ZFCP_LOG_INFO("sense data record is required\n");
 309                 retval = -EINVAL;
 310                 goto out;
 311         }
 312
 313         retval = copy_from_user(sense_data, sense_data_user,
 314                                 sizeof(struct zfcp_cfdc_sense_data));
 315         if (retval) {
 316                 retval = -EFAULT;
 317                 goto out;
 318         }
 319
 320         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
 321                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 322                               ZFCP_CFDC_SIGNATURE);
 323                 retval = -EINVAL;
 324                 goto out;
 325         }
 326
 327         switch (sense_data->command) {
 328
 329         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 330                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 331                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 332                 break;
 333
 334         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 335                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 336                 option = FSF_CFDC_OPTION_FORCE;
 337                 break;
 338
 339         case ZFCP_CFDC_CMND_FULL_ACCESS:
 340                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 341                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 342                 break;
 343
 344         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 345                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 346                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 347                 break;
 348
 349         case ZFCP_CFDC_CMND_UPLOAD:
 350                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 351                 option = 0;
 352                 break;
 353
 354         default:
 355                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 356                               sense_data->command);
 357                 retval = -EINVAL;
 358                 goto out;
 359         }
 360
 361         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 362         if (bus_id == NULL) {
 363                 retval = -ENOMEM;
 364                 goto out;
 365         }
 366         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 367                 (sense_data->devno >> 24),
 368                 (sense_data->devno >> 16) & 0xFF,
 369                 (sense_data->devno & 0xFFFF));
 370
 371         read_lock_irq(&zfcp_data.config_lock);
 372         adapter = zfcp_get_adapter_by_busid(bus_id);
 373         if (adapter)
 374                 zfcp_adapter_get(adapter);
 375         read_unlock_irq(&zfcp_data.config_lock);
 376
 377         kfree(bus_id);
 378
 379         if (adapter == NULL) {
 380                 ZFCP_LOG_INFO("invalid adapter\n");
 381                 retval = -ENXIO;
 382                 goto out;
 383         }
 384
 385         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 386                 retval = zfcp_sg_list_alloc(sg_list,
 387                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 388                 if (retval) {
 389                         retval = -ENOMEM;
 390                         goto out;
 391                 }
 392         }
 393
 394         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
 395             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 396                 retval = zfcp_sg_list_copy_from_user(
 397                         sg_list, &sense_data_user->control_file,
 398                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 399                 if (retval) {
 400                         retval = -EFAULT;
 401                         goto out;
 402                 }
 403         }
 404
 405         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
 406                                        option, sg_list);
 407         if (retval)
 408                 goto out;
 409
 410         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 411             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 412                 retval = -ENXIO;
 413                 goto out;
 414         }
 415
 416         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
 417         memcpy(&sense_data->fsf_status_qual,
 418                &fsf_req->qtcb->header.fsf_status_qual,
 419                sizeof(union fsf_status_qual));
 420         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
 421
 422         retval = copy_to_user(sense_data_user, sense_data,
 423                 sizeof(struct zfcp_cfdc_sense_data));
 424         if (retval) {
 425                 retval = -EFAULT;
 426                 goto out;
 427         }
 428
 429         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
 430                 retval = zfcp_sg_list_copy_to_user(
 431                         &sense_data_user->control_file, sg_list,
 432                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 433                 if (retval) {
 434                         retval = -EFAULT;
 435                         goto out;
 436                 }
 437         }
 438
 439  out:
 440         if (fsf_req != NULL)
 441                 zfcp_fsf_req_free(fsf_req);
 442
 443         if ((adapter != NULL) && (retval != -ENXIO))
 444                 zfcp_adapter_put(adapter);
 445
 446         if (sg_list != NULL) {
 447                 zfcp_sg_list_free(sg_list);
 448                 kfree(sg_list);
 449         }
 450
 451         kfree(sense_data);
 452
 453         return retval;
 454 }
 455
 456
 457 /**
 458  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 459  * @sg_list: structure describing a scatter gather list
 460  * @size: size of scatter-gather list
 461  * Return: 0 on success, else -ENOMEM
 462  *
 463  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 464  * or NULL if we run out of memory. sg_list->count specifies the number of
 465  * elements of the scatter-gather list. The maximum size of a single element
 466  * in the scatter-gather list is PAGE_SIZE.
 467  */
 468 static inline int
 469 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 470 {
 471         struct scatterlist *sg;
 472         unsigned int i;
 473         int retval = 0;
 474         void *address;
 475
 476         BUG_ON(sg_list == NULL);
 477
 478         sg_list->count = size >> PAGE_SHIFT;
 479         if (size & ~PAGE_MASK)
 480                 sg_list->count++;
 481         sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
 482                               GFP_KERNEL);
 483         if (sg_list->sg == NULL) {
 484                 sg_list->count = 0;
 485                 retval = -ENOMEM;
 486                 goto out;
 487         }
 488         memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
 489
 490         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 491                 sg->length = min(size, PAGE_SIZE);
 492                 sg->offset = 0;
 493                 address = (void *) get_zeroed_page(GFP_KERNEL);
 494                 if (address == NULL) {
 495                         sg_list->count = i;
 496                         zfcp_sg_list_free(sg_list);
 497                         retval = -ENOMEM;
 498                         goto out;
 499                 }
 500                 zfcp_address_to_sg(address, sg);
 501                 size -= sg->length;
 502         }
 503
 504  out:
 505         return retval;
 506 }
 507
 508
 509 /**
 510  * zfcp_sg_list_free - free memory of a scatter-gather list
 511  * @sg_list: structure describing a scatter-gather list
 512  *
 513  * Memory for each element in the scatter-gather list is freed.
 514  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 515  */
 516 static inline void
 517 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 518 {
 519         struct scatterlist *sg;
 520         unsigned int i;
 521
 522         BUG_ON(sg_list == NULL);
 523
 524         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 525                 free_page((unsigned long) zfcp_sg_to_address(sg));
 526
 527         sg_list->count = 0;
 528         kfree(sg_list->sg);
 529 }
 530
 531 /**
 532  * zfcp_sg_size - determine size of a scatter-gather list
 533  * @sg: array of (struct scatterlist)
 534  * @sg_count: elements in array
 535  * Return: size of entire scatter-gather list
 536  */
 537 size_t
 538 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 539 {
 540         unsigned int i;
 541         struct scatterlist *p;
 542         size_t size;
 543
 544         size = 0;
 545         for (i = 0, p = sg; i < sg_count; i++, p++) {
 546                 BUG_ON(p == NULL);
 547                 size += p->length;
 548         }
 549
 550         return size;
 551 }
 552
 553
 554 /**
 555  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 556  * @sg_list: structure describing a scatter-gather list
 557  * @user_buffer: pointer to buffer in user space
 558  * @size: number of bytes to be copied
 559  * Return: 0 on success, -EFAULT if copy_from_user fails.
 560  */
 561 static inline int
 562 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 563                             void __user *user_buffer,
 564                             size_t size)
 565 {
 566         struct scatterlist *sg;
 567         unsigned int length;
 568         void *zfcp_buffer;
 569         int retval = 0;
 570
 571         BUG_ON(sg_list == NULL);
 572
 573         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 574                 return -EFAULT;
 575
 576         for (sg = sg_list->sg; size > 0; sg++) {
 577                 length = min((unsigned int)size, sg->length);
 578                 zfcp_buffer = zfcp_sg_to_address(sg);
 579                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 580                         retval = -EFAULT;
 581                         goto out;
 582                 }
 583                 user_buffer += length;
 584                 size -= length;
 585         }
 586
 587  out:
 588         return retval;
 589 }
 590
 591
 592 /**
 593  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 594  * @user_buffer: pointer to buffer in user space
 595  * @sg_list: structure describing a scatter-gather list
 596  * @size: number of bytes to be copied
 597  * Return: 0 on success, -EFAULT if copy_to_user fails
 598  */
 599 static inline int
 600 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 601                           struct zfcp_sg_list *sg_list,
 602                           size_t size)
 603 {
 604         struct scatterlist *sg;
 605         unsigned int length;
 606         void *zfcp_buffer;
 607         int retval = 0;
 608
 609         BUG_ON(sg_list == NULL);
 610
 611         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 612                 return -EFAULT;
 613
 614         for (sg = sg_list->sg; size > 0; sg++) {
 615                 length = min((unsigned int) size, sg->length);
 616                 zfcp_buffer = zfcp_sg_to_address(sg);
 617                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 618                         retval = -EFAULT;
 619                         goto out;
 620                 }
 621                 user_buffer += length;
 622                 size -= length;
 623         }
 624
 625  out:
 626         return retval;
 627 }
 628
 629
 630 #undef ZFCP_LOG_AREA
 631
 632 /****************************************************************/
 633 /****** Functions for configuration/set-up of structures ********/
 634 /****************************************************************/
 635
 636 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 637
 638 /**
 639  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 640  * @port: pointer to port to search for unit
 641  * @fcp_lun: FCP LUN to search for
 642  * Traverse list of all units of a port and return pointer to a unit
 643  * with the given FCP LUN.
 644  */
 645 struct zfcp_unit *
 646 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 647 {
 648         struct zfcp_unit *unit;
 649         int found = 0;
 650
 651         list_for_each_entry(unit, &port->unit_list_head, list) {
 652                 if ((unit->fcp_lun == fcp_lun) &&
 653                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 654                 {
 655                         found = 1;
 656                         break;
 657                 }
 658         }
 659         return found ? unit : NULL;
 660 }
 661
 662 /**
 663  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 664  * @adapter: pointer to adapter to search for port
 665  * @wwpn: wwpn to search for
 666  * Traverse list of all ports of an adapter and return pointer to a port
 667  * with the given wwpn.
 668  */
 669 struct zfcp_port *
 670 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 671 {
 672         struct zfcp_port *port;
 673         int found = 0;
 674
 675         list_for_each_entry(port, &adapter->port_list_head, list) {
 676                 if ((port->wwpn == wwpn) &&
 677                     !(atomic_read(&port->status) &
 678                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 679                         found = 1;
 680                         break;
 681                 }
 682         }
 683         return found ? port : NULL;
 684 }
 685
 686 /**
 687  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 688  * @adapter: pointer to adapter to search for port
 689  * @d_id: d_id to search for
 690  * Traverse list of all ports of an adapter and return pointer to a port
 691  * with the given d_id.
 692  */
 693 struct zfcp_port *
 694 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 695 {
 696         struct zfcp_port *port;
 697         int found = 0;
 698
 699         list_for_each_entry(port, &adapter->port_list_head, list) {
 700                 if ((port->d_id == d_id) &&
 701                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 702                 {
 703                         found = 1;
 704                         break;
 705                 }
 706         }
 707         return found ? port : NULL;
 708 }
 709
 710 /**
 711  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 712  * @bus_id: bus_id to search for
 713  * Traverse list of all adapters and return pointer to an adapter
 714  * with the given bus_id.
 715  */
 716 struct zfcp_adapter *
 717 zfcp_get_adapter_by_busid(char *bus_id)
 718 {
 719         struct zfcp_adapter *adapter;
 720         int found = 0;
 721
 722         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 723                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 724                              BUS_ID_SIZE) == 0) &&
 725                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 726                                       &adapter->status)){
 727                         found = 1;
 728                         break;
 729                 }
 730         }
 731         return found ? adapter : NULL;
 732 }
 733
 734 /**
 735  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 736  * @port: pointer to port where unit is added
 737  * @fcp_lun: FCP LUN of unit to be enqueued
 738  * Return: pointer to enqueued unit on success, NULL on error
 739  * Locks: config_sema must be held to serialize changes to the unit list
 740  *
 741  * Sets up some unit internal structures and creates sysfs entry.
 742  */
 743 struct zfcp_unit *
 744 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 745 {
 746         struct zfcp_unit *unit, *tmp_unit;
 747         scsi_lun_t scsi_lun;
 748         int found;
 749
 750         /*
 751          * check that there is no unit with this FCP_LUN already in list
 752          * and enqueue it.
 753          * Note: Unlike for the adapter and the port, this is an error
 754          */
 755         read_lock_irq(&zfcp_data.config_lock);
 756         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 757         read_unlock_irq(&zfcp_data.config_lock);
 758         if (unit)
 759                 return NULL;
 760
 761         unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 762         if (!unit)
 763                 return NULL;
 764         memset(unit, 0, sizeof (struct zfcp_unit));
 765
 766         /* initialise reference count stuff */
 767         atomic_set(&unit->refcount, 0);
 768         init_waitqueue_head(&unit->remove_wq);
 769
 770         unit->port = port;
 771         unit->fcp_lun = fcp_lun;
 772
 773         /* setup for sysfs registration */
 774         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 775         unit->sysfs_device.parent = &port->sysfs_device;
 776         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 777         dev_set_drvdata(&unit->sysfs_device, unit);
 778
 779         /* mark unit unusable as long as sysfs registration is not complete */
 780         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 781
 782         if (device_register(&unit->sysfs_device)) {
 783                 kfree(unit);
 784                 return NULL;
 785         }
 786
 787         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 788                 device_unregister(&unit->sysfs_device);
 789                 return NULL;
 790         }
 791
 792         zfcp_unit_get(unit);
 793
 794         scsi_lun = 0;
 795         found = 0;
 796         write_lock_irq(&zfcp_data.config_lock);
 797         list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
 798                 if (tmp_unit->scsi_lun != scsi_lun) {
 799                         found = 1;
 800                         break;
 801                 }
 802                 scsi_lun++;
 803         }
 804         unit->scsi_lun = scsi_lun;
 805         if (found)
 806                 list_add_tail(&unit->list, &tmp_unit->list);
 807         else
 808                 list_add_tail(&unit->list, &port->unit_list_head);
 809         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 810         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 811         write_unlock_irq(&zfcp_data.config_lock);
 812
 813         port->units++;
 814         zfcp_port_get(port);
 815
 816         return unit;
 817 }
 818
 819 void
 820 zfcp_unit_dequeue(struct zfcp_unit *unit)
 821 {
 822         zfcp_unit_wait(unit);
 823         write_lock_irq(&zfcp_data.config_lock);
 824         list_del(&unit->list);
 825         write_unlock_irq(&zfcp_data.config_lock);
 826         unit->port->units--;
 827         zfcp_port_put(unit->port);
 828         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 829         device_unregister(&unit->sysfs_device);
 830 }
 831
 832 static void *
 833 zfcp_mempool_alloc(gfp_t gfp_mask, void *size)
 834 {
 835         return kmalloc((size_t) size, gfp_mask);
 836 }
 837
 838 static void
 839 zfcp_mempool_free(void *element, void *size)
 840 {
 841         kfree(element);
 842 }
 843
 844 /*
 845  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 846  * commands.
 847  * It also genrates fcp-nameserver request/response buffer and unsolicited
 848  * status read fsf_req buffers.
 849  *
 850  * locks:       must only be called with zfcp_data.config_sema taken
 851  */
 852 static int
 853 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 854 {
 855         adapter->pool.fsf_req_erp =
 856                 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
 857                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 858                                sizeof(struct zfcp_fsf_req_pool_element));
 859
 860         if (NULL == adapter->pool.fsf_req_erp)
 861                 return -ENOMEM;
 862
 863         adapter->pool.fsf_req_scsi =
 864                 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
 865                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 866                                sizeof(struct zfcp_fsf_req_pool_element));
 867
 868         if (NULL == adapter->pool.fsf_req_scsi)
 869                 return -ENOMEM;
 870
 871         adapter->pool.fsf_req_abort =
 872                 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
 873                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 874                                sizeof(struct zfcp_fsf_req_pool_element));
 875
 876         if (NULL == adapter->pool.fsf_req_abort)
 877                 return -ENOMEM;
 878
 879         adapter->pool.fsf_req_status_read =
 880                 mempool_create(ZFCP_POOL_STATUS_READ_NR,
 881                                zfcp_mempool_alloc, zfcp_mempool_free,
 882                                (void *) sizeof(struct zfcp_fsf_req));
 883
 884         if (NULL == adapter->pool.fsf_req_status_read)
 885                 return -ENOMEM;
 886
 887         adapter->pool.data_status_read =
 888                 mempool_create(ZFCP_POOL_STATUS_READ_NR,
 889                                zfcp_mempool_alloc, zfcp_mempool_free,
 890                                (void *) sizeof(struct fsf_status_read_buffer));
 891
 892         if (NULL == adapter->pool.data_status_read)
 893                 return -ENOMEM;
 894
 895         adapter->pool.data_gid_pn =
 896                 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
 897                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 898                                sizeof(struct zfcp_gid_pn_data));
 899
 900         if (NULL == adapter->pool.data_gid_pn)
 901                 return -ENOMEM;
 902
 903         return 0;
 904 }
 905
 906 /**
 907  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 908  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 909  * locking:  zfcp_data.config_sema must be held
 910  */
 911 static void
 912 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 913 {
 914         if (adapter->pool.fsf_req_erp)
 915                 mempool_destroy(adapter->pool.fsf_req_erp);
 916         if (adapter->pool.fsf_req_scsi)
 917                 mempool_destroy(adapter->pool.fsf_req_scsi);
 918         if (adapter->pool.fsf_req_abort)
 919                 mempool_destroy(adapter->pool.fsf_req_abort);
 920         if (adapter->pool.fsf_req_status_read)
 921                 mempool_destroy(adapter->pool.fsf_req_status_read);
 922         if (adapter->pool.data_status_read)
 923                 mempool_destroy(adapter->pool.data_status_read);
 924         if (adapter->pool.data_gid_pn)
 925                 mempool_destroy(adapter->pool.data_gid_pn);
 926 }
 927
 928 void
 929 zfcp_dummy_release(struct device *dev)
 930 {
 931         return;
 932 }
 933
 934 /*
 935  * Enqueues an adapter at the end of the adapter list in the driver data.
 936  * All adapter internal structures are set up.
 937  * Proc-fs entries are also created.
 938  *
 939  * returns:     0             if a new adapter was successfully enqueued
 940  *              ZFCP_KNOWN    if an adapter with this devno was already present
 941  *              -ENOMEM       if alloc failed
 942  * locks:       config_sema must be held to serialise changes to the adapter list
 943  */
 944 struct zfcp_adapter *
 945 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 946 {
 947         int retval = 0;
 948         struct zfcp_adapter *adapter;
 949
 950         /*
 951          * Note: It is safe to release the list_lock, as any list changes
 952          * are protected by the config_sema, which must be held to get here
 953          */
 954
 955         /* try to allocate new adapter data structure (zeroed) */
 956         adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
 957         if (!adapter) {
 958                 ZFCP_LOG_INFO("error: allocation of base adapter "
 959                               "structure failed\n");
 960                 goto out;
 961         }
 962         memset(adapter, 0, sizeof (struct zfcp_adapter));
 963
 964         ccw_device->handler = NULL;
 965
 966         /* save ccw_device pointer */
 967         adapter->ccw_device = ccw_device;
 968
 969         retval = zfcp_qdio_allocate_queues(adapter);
 970         if (retval)
 971                 goto queues_alloc_failed;
 972
 973         retval = zfcp_qdio_allocate(adapter);
 974         if (retval)
 975                 goto qdio_allocate_failed;
 976
 977         retval = zfcp_allocate_low_mem_buffers(adapter);
 978         if (retval) {
 979                 ZFCP_LOG_INFO("error: pool allocation failed\n");
 980                 goto failed_low_mem_buffers;
 981         }
 982
 983         /* initialise reference count stuff */
 984         atomic_set(&adapter->refcount, 0);
 985         init_waitqueue_head(&adapter->remove_wq);
 986
 987         /* initialise list of ports */
 988         INIT_LIST_HEAD(&adapter->port_list_head);
 989
 990         /* initialise list of ports to be removed */
 991         INIT_LIST_HEAD(&adapter->port_remove_lh);
 992
 993         /* initialize list of fsf requests */
 994         spin_lock_init(&adapter->fsf_req_list_lock);
 995         INIT_LIST_HEAD(&adapter->fsf_req_list_head);
 996
 997         /* initialize debug locks */
 998
 999         spin_lock_init(&adapter->erp_dbf_lock);
1000         spin_lock_init(&adapter->hba_dbf_lock);
1001         spin_lock_init(&adapter->san_dbf_lock);
1002         spin_lock_init(&adapter->scsi_dbf_lock);
1003
1004         /* initialize error recovery stuff */
1005
1006         rwlock_init(&adapter->erp_lock);
1007         sema_init(&adapter->erp_ready_sem, 0);
1008         INIT_LIST_HEAD(&adapter->erp_ready_head);
1009         INIT_LIST_HEAD(&adapter->erp_running_head);
1010
1011         /* initialize abort lock */
1012         rwlock_init(&adapter->abort_lock);
1013
1014         /* initialise some erp stuff */
1015         init_waitqueue_head(&adapter->erp_thread_wqh);
1016         init_waitqueue_head(&adapter->erp_done_wqh);
1017
1018         /* initialize lock of associated request queue */
1019         rwlock_init(&adapter->request_queue.queue_lock);
1020
1021         /* intitialise SCSI ER timer */
1022         init_timer(&adapter->scsi_er_timer);
1023
1024         /* set FC service class used per default */
1025         adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1026
1027         sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1028         ASCEBC(adapter->name, strlen(adapter->name));
1029
1030         /* mark adapter unusable as long as sysfs registration is not complete */
1031         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1032
1033         adapter->ccw_device = ccw_device;
1034         dev_set_drvdata(&ccw_device->dev, adapter);
1035
1036         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1037                 goto sysfs_failed;
1038
1039         adapter->generic_services.parent = &adapter->ccw_device->dev;
1040         adapter->generic_services.release = zfcp_dummy_release;
1041         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1042                  "generic_services");
1043
1044         if (device_register(&adapter->generic_services))
1045                 goto generic_services_failed;
1046
1047         /* put allocated adapter at list tail */
1048         write_lock_irq(&zfcp_data.config_lock);
1049         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1050         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1051         write_unlock_irq(&zfcp_data.config_lock);
1052
1053         zfcp_data.adapters++;
1054
1055         goto out;
1056
1057  generic_services_failed:
1058         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1059  sysfs_failed:
1060         dev_set_drvdata(&ccw_device->dev, NULL);
1061  failed_low_mem_buffers:
1062         zfcp_free_low_mem_buffers(adapter);
1063         if (qdio_free(ccw_device) != 0)
1064                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1065                                 zfcp_get_busid_by_adapter(adapter));
1066  qdio_allocate_failed:
1067         zfcp_qdio_free_queues(adapter);
1068  queues_alloc_failed:
1069         kfree(adapter);
1070         adapter = NULL;
1071  out:
1072         return adapter;
1073 }
1074
1075 /*
1076  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1077  *              !0 - struct zfcp_adapter  data structure could not be removed
1078  *                      (e.g. still used)
1079  * locks:       adapter list write lock is assumed to be held by caller
1080  *              adapter->fsf_req_list_lock is taken and released within this
1081  *              function and must not be held on entry
1082  */
1083 void
1084 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1085 {
1086         int retval = 0;
1087         unsigned long flags;
1088
1089         device_unregister(&adapter->generic_services);
1090         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1091         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1092         /* sanity check: no pending FSF requests */
1093         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1094         retval = !list_empty(&adapter->fsf_req_list_head);
1095         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1096         if (retval) {
1097                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1098                                 "%i requests outstanding\n",
1099                                 zfcp_get_busid_by_adapter(adapter), adapter,
1100                                 atomic_read(&adapter->fsf_reqs_active));
1101                 retval = -EBUSY;
1102                 goto out;
1103         }
1104
1105         /* remove specified adapter data structure from list */
1106         write_lock_irq(&zfcp_data.config_lock);
1107         list_del(&adapter->list);
1108         write_unlock_irq(&zfcp_data.config_lock);
1109
1110         /* decrease number of adapters in list */
1111         zfcp_data.adapters--;
1112
1113         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1114                        "%i adapters still in list\n",
1115                        zfcp_get_busid_by_adapter(adapter),
1116                        adapter, zfcp_data.adapters);
1117
1118         retval = qdio_free(adapter->ccw_device);
1119         if (retval)
1120                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1121                                 zfcp_get_busid_by_adapter(adapter));
1122
1123         zfcp_free_low_mem_buffers(adapter);
1124         /* free memory of adapter data structure and queues */
1125         zfcp_qdio_free_queues(adapter);
1126         kfree(adapter->fc_stats);
1127         kfree(adapter->stats_reset_data);
1128         ZFCP_LOG_TRACE("freeing adapter structure\n");
1129         kfree(adapter);
1130  out:
1131         return;
1132 }
1133
1134 /**
1135  * zfcp_port_enqueue - enqueue port to port list of adapter
1136  * @adapter: adapter where remote port is added
1137  * @wwpn: WWPN of the remote port to be enqueued
1138  * @status: initial status for the port
1139  * @d_id: destination id of the remote port to be enqueued
1140  * Return: pointer to enqueued port on success, NULL on error
1141  * Locks: config_sema must be held to serialize changes to the port list
1142  *
1143  * All port internal structures are set up and the sysfs entry is generated.
1144  * d_id is used to enqueue ports with a well known address like the Directory
1145  * Service for nameserver lookup.
1146  */
1147 struct zfcp_port *
1148 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1149                   u32 d_id)
1150 {
1151         struct zfcp_port *port;
1152         int check_wwpn;
1153
1154         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1155         /*
1156          * check that there is no port with this WWPN already in list
1157          */
1158         if (check_wwpn) {
1159                 read_lock_irq(&zfcp_data.config_lock);
1160                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1161                 read_unlock_irq(&zfcp_data.config_lock);
1162                 if (port)
1163                         return NULL;
1164         }
1165
1166         port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1167         if (!port)
1168                 return NULL;
1169         memset(port, 0, sizeof (struct zfcp_port));
1170
1171         /* initialise reference count stuff */
1172         atomic_set(&port->refcount, 0);
1173         init_waitqueue_head(&port->remove_wq);
1174
1175         INIT_LIST_HEAD(&port->unit_list_head);
1176         INIT_LIST_HEAD(&port->unit_remove_lh);
1177
1178         port->adapter = adapter;
1179
1180         if (check_wwpn)
1181                 port->wwpn = wwpn;
1182
1183         atomic_set_mask(status, &port->status);
1184
1185         /* setup for sysfs registration */
1186         if (status & ZFCP_STATUS_PORT_WKA) {
1187                 switch (d_id) {
1188                 case ZFCP_DID_DIRECTORY_SERVICE:
1189                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1190                                  "directory");
1191                         break;
1192                 case ZFCP_DID_MANAGEMENT_SERVICE:
1193                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1194                                  "management");
1195                         break;
1196                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1197                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1198                                  "key_distribution");
1199                         break;
1200                 case ZFCP_DID_ALIAS_SERVICE:
1201                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1202                                  "alias");
1203                         break;
1204                 case ZFCP_DID_TIME_SERVICE:
1205                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1206                                  "time");
1207                         break;
1208                 default:
1209                         kfree(port);
1210                         return NULL;
1211                 }
1212                 port->d_id = d_id;
1213                 port->sysfs_device.parent = &adapter->generic_services;
1214         } else {
1215                 snprintf(port->sysfs_device.bus_id,
1216                          BUS_ID_SIZE, "0x%016llx", wwpn);
1217                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1218         }
1219         port->sysfs_device.release = zfcp_sysfs_port_release;
1220         dev_set_drvdata(&port->sysfs_device, port);
1221
1222         /* mark port unusable as long as sysfs registration is not complete */
1223         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1224
1225         if (device_register(&port->sysfs_device)) {
1226                 kfree(port);
1227                 return NULL;
1228         }
1229
1230         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1231                 device_unregister(&port->sysfs_device);
1232                 return NULL;
1233         }
1234
1235         zfcp_port_get(port);
1236
1237         write_lock_irq(&zfcp_data.config_lock);
1238         list_add_tail(&port->list, &adapter->port_list_head);
1239         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1240         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1241         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1242                 if (!adapter->nameserver_port)
1243                         adapter->nameserver_port = port;
1244         adapter->ports++;
1245         write_unlock_irq(&zfcp_data.config_lock);
1246
1247         zfcp_adapter_get(adapter);
1248
1249         return port;
1250 }
1251
1252 void
1253 zfcp_port_dequeue(struct zfcp_port *port)
1254 {
1255         zfcp_port_wait(port);
1256         write_lock_irq(&zfcp_data.config_lock);
1257         list_del(&port->list);
1258         port->adapter->ports--;
1259         write_unlock_irq(&zfcp_data.config_lock);
1260         if (port->rport)
1261                 fc_remote_port_delete(port->rport);
1262         port->rport = NULL;
1263         zfcp_adapter_put(port->adapter);
1264         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1265                                      atomic_read(&port->status));
1266         device_unregister(&port->sysfs_device);
1267 }
1268
1269 /* Enqueues a nameserver port */
1270 int
1271 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1272 {
1273         struct zfcp_port *port;
1274
1275         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1276                                  ZFCP_DID_DIRECTORY_SERVICE);
1277         if (!port) {
1278                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1279                               "adapter %s failed\n",
1280                               zfcp_get_busid_by_adapter(adapter));
1281                 return -ENXIO;
1282         }
1283         zfcp_port_put(port);
1284
1285         return 0;
1286 }
1287
1288 #undef ZFCP_LOG_AREA
1289
1290 /****************************************************************/
1291 /******* Fibre Channel Standard related Functions  **************/
1292 /****************************************************************/
1293
1294 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1295
1296 void
1297 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1298                            struct fsf_status_read_buffer *status_buffer)
1299 {
1300         struct fcp_rscn_head *fcp_rscn_head;
1301         struct fcp_rscn_element *fcp_rscn_element;
1302         struct zfcp_port *port;
1303         u16 i;
1304         u16 no_entries;
1305         u32 range_mask;
1306         unsigned long flags;
1307
1308         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1309         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1310
1311         /* see FC-FS */
1312         no_entries = (fcp_rscn_head->payload_len / 4);
1313
1314         for (i = 1; i < no_entries; i++) {
1315                 /* skip head and start with 1st element */
1316                 fcp_rscn_element++;
1317                 switch (fcp_rscn_element->addr_format) {
1318                 case ZFCP_PORT_ADDRESS:
1319                         range_mask = ZFCP_PORTS_RANGE_PORT;
1320                         break;
1321                 case ZFCP_AREA_ADDRESS:
1322                         range_mask = ZFCP_PORTS_RANGE_AREA;
1323                         break;
1324                 case ZFCP_DOMAIN_ADDRESS:
1325                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1326                         break;
1327                 case ZFCP_FABRIC_ADDRESS:
1328                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1329                         break;
1330                 default:
1331                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1332                                       "address format\n");
1333                         continue;
1334                 }
1335                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1336                 list_for_each_entry(port, &adapter->port_list_head, list) {
1337                         if (atomic_test_mask
1338                             (ZFCP_STATUS_PORT_WKA, &port->status))
1339                                 continue;
1340                         /* Do we know this port? If not skip it. */
1341                         if (!atomic_test_mask
1342                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1343                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1344                                               "port 0x%016Lx\n", port->wwpn);
1345                                 zfcp_erp_port_reopen(port,
1346                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1347                                 continue;
1348                         }
1349
1350                         /*
1351                          * FIXME: race: d_id might being invalidated
1352                          * (...DID_DID reset)
1353                          */
1354                         if ((port->d_id & range_mask)
1355                             == (fcp_rscn_element->nport_did & range_mask)) {
1356                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1357                                                fcp_rscn_element->nport_did);
1358                                 /*
1359                                  * Unfortunately, an RSCN does not specify the
1360                                  * type of change a target underwent. We assume
1361                                  * that it makes sense to reopen the link.
1362                                  * FIXME: Shall we try to find out more about
1363                                  * the target and link state before closing it?
1364                                  * How to accomplish this? (nameserver?)
1365                                  * Where would such code be put in?
1366                                  * (inside or outside erp)
1367                                  */
1368                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1369                                               "port 0x%016Lx\n", port->wwpn);
1370                                 zfcp_test_link(port);
1371                         }
1372                 }
1373                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1374         }
1375 }
1376
1377 static void
1378 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1379                             struct fsf_status_read_buffer *status_buffer)
1380 {
1381         logi *els_logi = (logi *) status_buffer->payload;
1382         struct zfcp_port *port;
1383         unsigned long flags;
1384
1385         read_lock_irqsave(&zfcp_data.config_lock, flags);
1386         list_for_each_entry(port, &adapter->port_list_head, list) {
1387                 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1388                         break;
1389         }
1390         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1391
1392         if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1393                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1394                                "with d_id 0x%08x on adapter %s\n",
1395                                status_buffer->d_id,
1396                                zfcp_get_busid_by_adapter(adapter));
1397         } else {
1398                 zfcp_erp_port_forced_reopen(port, 0);
1399         }
1400 }
1401
1402 static void
1403 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1404                            struct fsf_status_read_buffer *status_buffer)
1405 {
1406         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1407         struct zfcp_port *port;
1408         unsigned long flags;
1409
1410         read_lock_irqsave(&zfcp_data.config_lock, flags);
1411         list_for_each_entry(port, &adapter->port_list_head, list) {
1412                 if (port->wwpn == els_logo->nport_wwpn)
1413                         break;
1414         }
1415         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1416
1417         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1418                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1419                                "with d_id 0x%08x on adapter %s\n",
1420                                status_buffer->d_id,
1421                                zfcp_get_busid_by_adapter(adapter));
1422         } else {
1423                 zfcp_erp_port_forced_reopen(port, 0);
1424         }
1425 }
1426
1427 static void
1428 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1429                               struct fsf_status_read_buffer *status_buffer)
1430 {
1431         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1432                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1433                         zfcp_get_busid_by_adapter(adapter));
1434
1435 }
1436
1437 void
1438 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1439 {
1440         struct fsf_status_read_buffer *status_buffer;
1441         u32 els_type;
1442         struct zfcp_adapter *adapter;
1443
1444         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1445         els_type = *(u32 *) (status_buffer->payload);
1446         adapter = fsf_req->adapter;
1447
1448         zfcp_san_dbf_event_incoming_els(fsf_req);
1449         if (els_type == LS_PLOGI)
1450                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1451         else if (els_type == LS_LOGO)
1452                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1453         else if ((els_type & 0xffff0000) == LS_RSCN)
1454                 /* we are only concerned with the command, not the length */
1455                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1456         else
1457                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1458 }
1459
1460
1461 /**
1462  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1463  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1464  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1465  */
1466 static int
1467 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1468 {
1469         struct zfcp_gid_pn_data *data;
1470
1471         if (pool != NULL) {
1472                 data = mempool_alloc(pool, GFP_ATOMIC);
1473                 if (likely(data != NULL)) {
1474                         data->ct.pool = pool;
1475                 }
1476         } else {
1477                 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1478         }
1479
1480         if (NULL == data)
1481                 return -ENOMEM;
1482
1483         memset(data, 0, sizeof(*data));
1484         data->ct.req = &data->req;
1485         data->ct.resp = &data->resp;
1486         data->ct.req_count = data->ct.resp_count = 1;
1487         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1488         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1489         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1490         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1491
1492         *gid_pn = data;
1493         return 0;
1494 }
1495
1496 /**
1497  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1498  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1499  */
1500 static void
1501 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1502 {
1503         if ((gid_pn->ct.pool != 0))
1504                 mempool_free(gid_pn, gid_pn->ct.pool);
1505         else
1506                 kfree(gid_pn);
1507
1508         return;
1509 }
1510
1511 /**
1512  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1513  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1514  */
1515 int
1516 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1517 {
1518         int ret;
1519         struct ct_iu_gid_pn_req *ct_iu_req;
1520         struct zfcp_gid_pn_data *gid_pn;
1521         struct zfcp_adapter *adapter = erp_action->adapter;
1522
1523         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1524         if (ret < 0) {
1525                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1526                               "request failed for adapter %s\n",
1527                               zfcp_get_busid_by_adapter(adapter));
1528                 goto out;
1529         }
1530
1531         /* setup nameserver request */
1532         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1533         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1534         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1535         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1536         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1537         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1538         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1539         ct_iu_req->wwpn = erp_action->port->wwpn;
1540
1541         /* setup parameters for send generic command */
1542         gid_pn->ct.port = adapter->nameserver_port;
1543         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1544         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1545         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1546         gid_pn->ct.timer = &erp_action->timer;
1547         gid_pn->port = erp_action->port;
1548
1549         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1550                                erp_action);
1551         if (ret) {
1552                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1553                               "failed for adapter %s\n",
1554                               zfcp_get_busid_by_adapter(adapter));
1555
1556                 zfcp_gid_pn_buffers_free(gid_pn);
1557         }
1558
1559  out:
1560         return ret;
1561 }
1562
1563 /**
1564  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1565  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1566  */
1567 static void zfcp_ns_gid_pn_handler(unsigned long data)
1568 {
1569         struct zfcp_port *port;
1570         struct zfcp_send_ct *ct;
1571         struct ct_iu_gid_pn_req *ct_iu_req;
1572         struct ct_iu_gid_pn_resp *ct_iu_resp;
1573         struct zfcp_gid_pn_data *gid_pn;
1574
1575
1576         gid_pn = (struct zfcp_gid_pn_data *) data;
1577         port = gid_pn->port;
1578         ct = &gid_pn->ct;
1579         ct_iu_req = zfcp_sg_to_address(ct->req);
1580         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1581
1582         if (ct->status != 0)
1583                 goto failed;
1584
1585         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1586                 /* FIXME: do we need some specific erp entry points */
1587                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1588                 goto failed;
1589         }
1590         /* paranoia */
1591         if (ct_iu_req->wwpn != port->wwpn) {
1592                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1593                                 "lookup does not match expected wwpn 0x%016Lx "
1594                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1595                                 zfcp_get_busid_by_port(port));
1596                 goto mismatch;
1597         }
1598
1599         /* looks like a valid d_id */
1600         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1601         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1602         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%08x\n",
1603                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1604         goto out;
1605
1606  mismatch:
1607         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1608         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1609                       sizeof(struct ct_iu_gid_pn_req));
1610         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1611                       sizeof(struct ct_iu_gid_pn_resp));
1612
1613  failed:
1614         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1615                         "0x%016Lx for adapter %s\n",
1616                         port->wwpn, zfcp_get_busid_by_port(port));
1617  out:
1618         zfcp_gid_pn_buffers_free(gid_pn);
1619         return;
1620 }
1621
1622 /* reject CT_IU reason codes acc. to FC-GS-4 */
1623 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1624         {0x01, "invalid command code"},
1625         {0x02, "invalid version level"},
1626         {0x03, "logical error"},
1627         {0x04, "invalid CT_IU size"},
1628         {0x05, "logical busy"},
1629         {0x07, "protocol error"},
1630         {0x09, "unable to perform command request"},
1631         {0x0b, "command not supported"},
1632         {0x0d, "server not available"},
1633         {0x0e, "session could not be established"},
1634         {0xff, "vendor specific error"},
1635         {0, NULL},
1636 };
1637
1638 /* LS_RJT reason codes acc. to FC-FS */
1639 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1640         {0x01, "invalid LS_Command code"},
1641         {0x03, "logical error"},
1642         {0x05, "logical busy"},
1643         {0x07, "protocol error"},
1644         {0x09, "unable to perform command request"},
1645         {0x0b, "command not supported"},
1646         {0x0e, "command already in progress"},
1647         {0xff, "vendor specific error"},
1648         {0, NULL},
1649 };
1650
1651 /* reject reason codes according to FC-PH/FC-FS */
1652 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1653         {0x01, "invalid D_ID"},
1654         {0x02, "invalid S_ID"},
1655         {0x03, "Nx_Port not available, temporary"},
1656         {0x04, "Nx_Port not available, permament"},
1657         {0x05, "class not supported"},
1658         {0x06, "delimiter usage error"},
1659         {0x07, "TYPE not supported"},
1660         {0x08, "invalid Link_Control"},
1661         {0x09, "invalid R_CTL field"},
1662         {0x0a, "invalid F_CTL field"},
1663         {0x0b, "invalid OX_ID"},
1664         {0x0c, "invalid RX_ID"},
1665         {0x0d, "invalid SEQ_ID"},
1666         {0x0e, "invalid DF_CTL"},
1667         {0x0f, "invalid SEQ_CNT"},
1668         {0x10, "invalid parameter field"},
1669         {0x11, "exchange error"},
1670         {0x12, "protocol error"},
1671         {0x13, "incorrect length"},
1672         {0x14, "unsupported ACK"},
1673         {0x15, "class of service not supported by entity at FFFFFE"},
1674         {0x16, "login required"},
1675         {0x17, "excessive sequences attempted"},
1676         {0x18, "unable to establish exchange"},
1677         {0x1a, "fabric path not available"},
1678         {0x1b, "invalid VC_ID (class 4)"},
1679         {0x1c, "invalid CS_CTL field"},
1680         {0x1d, "insufficient resources for VC (class 4)"},
1681         {0x1f, "invalid class of service"},
1682         {0x20, "preemption request rejected"},
1683         {0x21, "preemption not enabled"},
1684         {0x22, "multicast error"},
1685         {0x23, "multicast error terminate"},
1686         {0x24, "process login required"},
1687         {0xff, "vendor specific reject"},
1688         {0, NULL},
1689 };
1690
1691 /**
1692  * zfcp_rc_description - return description for given reaon code
1693  * @code: reason code
1694  * @rc_table: table of reason codes and descriptions
1695  */
1696 static inline const char *
1697 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1698 {
1699         const char *descr = "unknown reason code";
1700
1701         do {
1702                 if (code == rc_table->code) {
1703                         descr = rc_table->description;
1704                         break;
1705                 }
1706                 rc_table++;
1707         } while (rc_table->code && rc_table->description);
1708
1709         return descr;
1710 }
1711
1712 /**
1713  * zfcp_check_ct_response - evaluate reason code for CT_IU
1714  * @rjt: response payload to an CT_IU request
1715  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1716  */
1717 int
1718 zfcp_check_ct_response(struct ct_hdr *rjt)
1719 {
1720         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1721                 return 0;
1722
1723         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1724                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1725                                 "response code (0x%04hx)\n",
1726                                 rjt->cmd_rsp_code);
1727                 return 1;
1728         }
1729
1730         ZFCP_LOG_INFO("Generic Service command rejected\n");
1731         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1732                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1733                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1734                       (u32) rjt->vendor_unique);
1735
1736         return 1;
1737 }
1738
1739 /**
1740  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1741  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1742  * @rc_table: table of reason codes and descriptions
1743  */
1744 static inline void
1745 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1746                    const struct zfcp_rc_entry *rc_table)
1747 {
1748         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1749                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1750                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1751                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1752 }
1753
1754 /**
1755  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1756  * @sq: status qualifier word
1757  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1758  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1759  */
1760 int
1761 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1762 {
1763         int ret = -EIO;
1764
1765         if (sq == FSF_IOSTAT_NPORT_RJT) {
1766                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1767                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1768                 /* invalid d_id */
1769                 if (rjt_par->reason_code == 0x01)
1770                         ret = -EREMCHG;
1771         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1772                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1773                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1774                 /* invalid d_id */
1775                 if (rjt_par->reason_code == 0x01)
1776                         ret = -EREMCHG;
1777         } else if (sq == FSF_IOSTAT_LS_RJT) {
1778                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1779                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1780                 ret = -EREMOTEIO;
1781         } else
1782                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1783
1784         return ret;
1785 }
1786
1787 #undef ZFCP_LOG_AREA