drivers/s390/scsi/zfcp_aux.c

   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  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 /* this drivers version (do not edit !!! generated and updated by cvs) */
  32 #define ZFCP_AUX_REVISION "$Revision: 1.129 $"
  33
  34 #include "zfcp_ext.h"
  35
  36 /* accumulated log level (module parameter) */
  37 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
  38 static char *device;
  39 /*********************** FUNCTION PROTOTYPES *********************************/
  40
  41 /* written against the module interface */
  42 static int __init  zfcp_module_init(void);
  43
  44 /* FCP related */
  45 static void zfcp_ns_gid_pn_handler(unsigned long);
  46
  47 /* miscellaneous */
  48
  49 static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
  50 static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
  51 static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
  52                                               void __user *, size_t);
  53 static inline int zfcp_sg_list_copy_to_user(void __user *,
  54                                             struct zfcp_sg_list *, size_t);
  55
  56 static int zfcp_cfdc_dev_ioctl(struct inode *, struct file *,
  57         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 #ifdef CONFIG_S390_SUPPORT
  64 static struct ioctl_trans zfcp_ioctl_trans = {ZFCP_CFDC_IOC, (void*) sys_ioctl};
  65 #endif
  66
  67 static struct file_operations zfcp_cfdc_fops = {
  68         .ioctl = zfcp_cfdc_dev_ioctl
  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("Heiko Carstens <heiko.carstens@de.ibm.com>, "
  83               "Martin Peschke <mpeschke@de.ibm.com>, "
  84               "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
  85               "Wolfgang Taphorn <taphorn@de.ibm.com>, "
  86               "Aron Zeh <arzeh@de.ibm.com>, "
  87               "IBM Deutschland Entwicklung GmbH");
  88 MODULE_DESCRIPTION
  89     ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
  90 MODULE_LICENSE("GPL");
  91
  92 module_param(device, charp, 0);
  93 MODULE_PARM_DESC(device, "specify initial device");
  94
  95 module_param(loglevel, uint, 0);
  96 MODULE_PARM_DESC(loglevel,
  97                  "log levels, 8 nibbles: "
  98                  "FC ERP QDIO CIO Config FSF SCSI Other, "
  99                  "levels: 0=none 1=normal 2=devel 3=trace");
 100
 101 #ifdef ZFCP_PRINT_FLAGS
 102 u32 flags_dump = 0;
 103 module_param(flags_dump, uint, 0);
 104 #endif
 105
 106 /****************************************************************/
 107 /************** Functions without logging ***********************/
 108 /****************************************************************/
 109
 110 void
 111 _zfcp_hex_dump(char *addr, int count)
 112 {
 113         int i;
 114         for (i = 0; i < count; i++) {
 115                 printk("%02x", addr[i]);
 116                 if ((i % 4) == 3)
 117                         printk(" ");
 118                 if ((i % 32) == 31)
 119                         printk("\n");
 120         }
 121         if (((i-1) % 32) != 31)
 122                 printk("\n");
 123 }
 124
 125 /****************************************************************/
 126 /************** Uncategorised Functions *************************/
 127 /****************************************************************/
 128
 129 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 130
 131 static inline int
 132 zfcp_fsf_req_is_scsi_cmnd(struct zfcp_fsf_req *fsf_req)
 133 {
 134         return ((fsf_req->fsf_command == FSF_QTCB_FCP_CMND) &&
 135                 !(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT));
 136 }
 137
 138 void
 139 zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
 140                        void *add_data, int add_length)
 141 {
 142         struct zfcp_adapter *adapter = fsf_req->adapter;
 143         struct scsi_cmnd *scsi_cmnd;
 144         int level = 3;
 145         int i;
 146         unsigned long flags;
 147
 148         write_lock_irqsave(&adapter->cmd_dbf_lock, flags);
 149         if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
 150                 scsi_cmnd = fsf_req->data.send_fcp_command_task.scsi_cmnd;
 151                 debug_text_event(adapter->cmd_dbf, level, "fsferror");
 152                 debug_text_event(adapter->cmd_dbf, level, text);
 153                 debug_event(adapter->cmd_dbf, level, &fsf_req,
 154                             sizeof (unsigned long));
 155                 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
 156                             sizeof (u32));
 157                 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
 158                             sizeof (unsigned long));
 159                 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
 160                             min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
 161                 for (i = 0; i < add_length; i += ZFCP_CMD_DBF_LENGTH)
 162                         debug_event(adapter->cmd_dbf,
 163                                     level,
 164                                     (char *) add_data + i,
 165                                     min(ZFCP_CMD_DBF_LENGTH, add_length - i));
 166         }
 167         write_unlock_irqrestore(&adapter->cmd_dbf_lock, flags);
 168 }
 169
 170 /* XXX additionally log unit if available */
 171 /* ---> introduce new parameter for unit, see 2.4 code */
 172 void
 173 zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
 174 {
 175         struct zfcp_adapter *adapter;
 176         union zfcp_req_data *req_data;
 177         struct zfcp_fsf_req *fsf_req;
 178         int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
 179         unsigned long flags;
 180
 181         adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
 182         req_data = (union zfcp_req_data *) scsi_cmnd->host_scribble;
 183         fsf_req = (req_data ? req_data->send_fcp_command_task.fsf_req : NULL);
 184         write_lock_irqsave(&adapter->cmd_dbf_lock, flags);
 185         debug_text_event(adapter->cmd_dbf, level, "hostbyte");
 186         debug_text_event(adapter->cmd_dbf, level, text);
 187         debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
 188         debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
 189                     sizeof (unsigned long));
 190         debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
 191                     min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
 192         if (likely(fsf_req)) {
 193                 debug_event(adapter->cmd_dbf, level, &fsf_req,
 194                             sizeof (unsigned long));
 195                 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
 196                             sizeof (u32));
 197         } else {
 198                 debug_text_event(adapter->cmd_dbf, level, "");
 199                 debug_text_event(adapter->cmd_dbf, level, "");
 200         }
 201         write_unlock_irqrestore(&adapter->cmd_dbf_lock, flags);
 202 }
 203
 204 void
 205 zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
 206                       struct fsf_status_read_buffer *status_buffer, int length)
 207 {
 208         int level = 1;
 209         int i;
 210
 211         debug_text_event(adapter->in_els_dbf, level, text);
 212         debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
 213         for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
 214                 debug_event(adapter->in_els_dbf,
 215                             level,
 216                             (char *) status_buffer->payload + i,
 217                             min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
 218 }
 219
 220 /**
 221  * zfcp_device_setup - setup function
 222  * @str: pointer to parameter string
 223  *
 224  * Parse "device=..." parameter string.
 225  */
 226 static int __init
 227 zfcp_device_setup(char *str)
 228 {
 229         char *tmp;
 230
 231         if (!str)
 232                 return 0;
 233
 234         tmp = strchr(str, ',');
 235         if (!tmp)
 236                 goto err_out;
 237         *tmp++ = '\0';
 238         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 239         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 240
 241         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 242         if (*tmp++ != ',')
 243                 goto err_out;
 244         if (*tmp == '\0')
 245                 goto err_out;
 246
 247         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 248         if (*tmp != '\0')
 249                 goto err_out;
 250         return 1;
 251
 252  err_out:
 253         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 254         return 0;
 255 }
 256
 257 static void __init
 258 zfcp_init_device_configure(void)
 259 {
 260         struct zfcp_adapter *adapter;
 261         struct zfcp_port *port;
 262         struct zfcp_unit *unit;
 263
 264         down(&zfcp_data.config_sema);
 265         read_lock_irq(&zfcp_data.config_lock);
 266         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 267         if (adapter)
 268                 zfcp_adapter_get(adapter);
 269         read_unlock_irq(&zfcp_data.config_lock);
 270
 271         if (adapter == NULL)
 272                 goto out_adapter;
 273         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 274         if (!port)
 275                 goto out_port;
 276         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 277         if (!unit)
 278                 goto out_unit;
 279         up(&zfcp_data.config_sema);
 280         ccw_device_set_online(adapter->ccw_device);
 281         wait_event(unit->scsi_add_wq, atomic_read(&unit->scsi_add_work) == 0);
 282         down(&zfcp_data.config_sema);
 283         zfcp_unit_put(unit);
 284  out_unit:
 285         zfcp_port_put(port);
 286  out_port:
 287         zfcp_adapter_put(adapter);
 288  out_adapter:
 289         up(&zfcp_data.config_sema);
 290         return;
 291 }
 292
 293 static int __init
 294 zfcp_module_init(void)
 295 {
 296
 297         int retval = 0;
 298
 299         atomic_set(&zfcp_data.loglevel, loglevel);
 300
 301         /* initialize adapter list */
 302         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 303
 304         /* initialize adapters to be removed list head */
 305         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 306
 307         zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
 308         if (!zfcp_transport_template)
 309                 return -ENODEV;
 310
 311 #ifdef CONFIG_S390_SUPPORT
 312         retval = register_ioctl32_conversion(zfcp_ioctl_trans.cmd,
 313                                              zfcp_ioctl_trans.handler);
 314         if (retval != 0) {
 315                 ZFCP_LOG_INFO("registration of ioctl32 conversion failed\n");
 316                 goto out_ioctl32;
 317         }
 318 #endif
 319         retval = misc_register(&zfcp_cfdc_misc);
 320         if (retval != 0) {
 321                 ZFCP_LOG_INFO("registration of misc device "
 322                               "zfcp_cfdc failed\n");
 323                 goto out_misc_register;
 324         } else {
 325                 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 326                                ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 327         }
 328
 329         /* Initialise proc semaphores */
 330         sema_init(&zfcp_data.config_sema, 1);
 331
 332         /* initialise configuration rw lock */
 333         rwlock_init(&zfcp_data.config_lock);
 334
 335         /* save address of data structure managing the driver module */
 336         zfcp_data.scsi_host_template.module = THIS_MODULE;
 337
 338         /* setup dynamic I/O */
 339         retval = zfcp_ccw_register();
 340         if (retval) {
 341                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 342                 goto out_ccw_register;
 343         }
 344
 345         if (zfcp_device_setup(device))
 346                 zfcp_init_device_configure();
 347
 348         goto out;
 349
 350  out_ccw_register:
 351         misc_deregister(&zfcp_cfdc_misc);
 352  out_misc_register:
 353 #ifdef CONFIG_S390_SUPPORT
 354         unregister_ioctl32_conversion(zfcp_ioctl_trans.cmd);
 355  out_ioctl32:
 356 #endif
 357
 358  out:
 359         return retval;
 360 }
 361
 362 /*
 363  * function:    zfcp_cfdc_dev_ioctl
 364  *
 365  * purpose:     Handle control file upload/download transaction via IOCTL
 366  *              interface
 367  *
 368  * returns:     0           - Operation completed successfuly
 369  *              -ENOTTY     - Unknown IOCTL command
 370  *              -EINVAL     - Invalid sense data record
 371  *              -ENXIO      - The FCP adapter is not available
 372  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 373  *              -ENOMEM     - Insufficient memory
 374  *              -EFAULT     - User space memory I/O operation fault
 375  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 376  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 377  */
 378 static int
 379 zfcp_cfdc_dev_ioctl(struct inode *inode, struct file *file,
 380                     unsigned int command, unsigned long buffer)
 381 {
 382         struct zfcp_cfdc_sense_data sense_data, __user *sense_data_user;
 383         struct zfcp_adapter *adapter = NULL;
 384         struct zfcp_fsf_req *fsf_req = NULL;
 385         struct zfcp_sg_list *sg_list = NULL;
 386         u32 fsf_command, option;
 387         char *bus_id = NULL;
 388         int retval = 0;
 389
 390         sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 391         if (sg_list == NULL) {
 392                 retval = -ENOMEM;
 393                 goto out;
 394         }
 395         memset(sg_list, 0, sizeof(*sg_list));
 396
 397         if (command != ZFCP_CFDC_IOC) {
 398                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 399                 retval = -ENOTTY;
 400                 goto out;
 401         }
 402
 403         if ((sense_data_user = (void __user *) buffer) == NULL) {
 404                 ZFCP_LOG_INFO("sense data record is required\n");
 405                 retval = -EINVAL;
 406                 goto out;
 407         }
 408
 409         retval = copy_from_user(&sense_data, sense_data_user,
 410                                 sizeof(struct zfcp_cfdc_sense_data));
 411         if (retval) {
 412                 retval = -EFAULT;
 413                 goto out;
 414         }
 415
 416         if (sense_data.signature != ZFCP_CFDC_SIGNATURE) {
 417                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 418                               ZFCP_CFDC_SIGNATURE);
 419                 retval = -EINVAL;
 420                 goto out;
 421         }
 422
 423         switch (sense_data.command) {
 424
 425         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 426                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 427                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 428                 break;
 429
 430         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 431                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 432                 option = FSF_CFDC_OPTION_FORCE;
 433                 break;
 434
 435         case ZFCP_CFDC_CMND_FULL_ACCESS:
 436                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 437                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 438                 break;
 439
 440         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 441                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 442                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 443                 break;
 444
 445         case ZFCP_CFDC_CMND_UPLOAD:
 446                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 447                 option = 0;
 448                 break;
 449
 450         default:
 451                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 452                               sense_data.command);
 453                 retval = -EINVAL;
 454                 goto out;
 455         }
 456
 457         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 458         if (bus_id == NULL) {
 459                 retval = -ENOMEM;
 460                 goto out;
 461         }
 462         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 463                 (sense_data.devno >> 24),
 464                 (sense_data.devno >> 16) & 0xFF,
 465                 (sense_data.devno & 0xFFFF));
 466
 467         read_lock_irq(&zfcp_data.config_lock);
 468         adapter = zfcp_get_adapter_by_busid(bus_id);
 469         if (adapter)
 470                 zfcp_adapter_get(adapter);
 471         read_unlock_irq(&zfcp_data.config_lock);
 472
 473         kfree(bus_id);
 474
 475         if (adapter == NULL) {
 476                 ZFCP_LOG_INFO("invalid adapter\n");
 477                 retval = -ENXIO;
 478                 goto out;
 479         }
 480
 481         if (sense_data.command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 482                 retval = zfcp_sg_list_alloc(sg_list,
 483                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 484                 if (retval) {
 485                         retval = -ENOMEM;
 486                         goto out;
 487                 }
 488         }
 489
 490         if ((sense_data.command & ZFCP_CFDC_DOWNLOAD) &&
 491             (sense_data.command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 492                 retval = zfcp_sg_list_copy_from_user(
 493                         sg_list, &sense_data_user->control_file,
 494                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 495                 if (retval) {
 496                         retval = -EFAULT;
 497                         goto out;
 498                 }
 499         }
 500
 501         retval = zfcp_fsf_control_file(
 502                 adapter, &fsf_req, fsf_command, option, sg_list);
 503         if (retval == -EOPNOTSUPP) {
 504                 ZFCP_LOG_INFO("adapter does not support cfdc\n");
 505                 goto out;
 506         } else if (retval != 0) {
 507                 ZFCP_LOG_INFO("initiation of cfdc up/download failed\n");
 508                 retval = -EPERM;
 509                 goto out;
 510         }
 511
 512         wait_event(fsf_req->completion_wq,
 513                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 514
 515         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 516             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 517                 retval = -ENXIO;
 518                 goto out;
 519         }
 520
 521         sense_data.fsf_status = fsf_req->qtcb->header.fsf_status;
 522         memcpy(&sense_data.fsf_status_qual,
 523                &fsf_req->qtcb->header.fsf_status_qual,
 524                sizeof(union fsf_status_qual));
 525         memcpy(&sense_data.payloads, &fsf_req->qtcb->bottom.support.els, 256);
 526
 527         retval = copy_to_user(sense_data_user, &sense_data,
 528                 sizeof(struct zfcp_cfdc_sense_data));
 529         if (retval) {
 530                 retval = -EFAULT;
 531                 goto out;
 532         }
 533
 534         if (sense_data.command & ZFCP_CFDC_UPLOAD) {
 535                 retval = zfcp_sg_list_copy_to_user(
 536                         &sense_data_user->control_file, sg_list,
 537                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 538                 if (retval) {
 539                         retval = -EFAULT;
 540                         goto out;
 541                 }
 542         }
 543
 544  out:
 545         if (fsf_req != NULL)
 546                 zfcp_fsf_req_cleanup(fsf_req);
 547
 548         if ((adapter != NULL) && (retval != -ENXIO))
 549                 zfcp_adapter_put(adapter);
 550
 551         if (sg_list != NULL) {
 552                 zfcp_sg_list_free(sg_list);
 553                 kfree(sg_list);
 554         }
 555
 556         return retval;
 557 }
 558
 559
 560 /**
 561  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 562  * @sg_list: structure describing a scatter gather list
 563  * @size: size of scatter-gather list
 564  * Return: 0 on success, else -ENOMEM
 565  *
 566  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 567  * or NULL if we run out of memory. sg_list->count specifies the number of
 568  * elements of the scatter-gather list. The maximum size of a single element
 569  * in the scatter-gather list is PAGE_SIZE.
 570  */
 571 static inline int
 572 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 573 {
 574         struct scatterlist *sg;
 575         unsigned int i;
 576         int retval = 0;
 577         void *address;
 578
 579         BUG_ON(sg_list == NULL);
 580
 581         sg_list->count = size >> PAGE_SHIFT;
 582         if (size & ~PAGE_MASK)
 583                 sg_list->count++;
 584         sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
 585                               GFP_KERNEL);
 586         if (sg_list->sg == NULL) {
 587                 sg_list->count = 0;
 588                 retval = -ENOMEM;
 589                 goto out;
 590         }
 591
 592         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 593                 sg->length = min(size, PAGE_SIZE);
 594                 sg->offset = 0;
 595                 address = (void *) get_zeroed_page(GFP_KERNEL);
 596                 zfcp_address_to_sg(address, sg);
 597                 if (sg->page == NULL) {
 598                         sg_list->count = i;
 599                         zfcp_sg_list_free(sg_list);
 600                         retval = -ENOMEM;
 601                         goto out;
 602                 }
 603                 size -= sg->length;
 604         }
 605
 606  out:
 607         return retval;
 608 }
 609
 610
 611 /**
 612  * zfcp_sg_list_free - free memory of a scatter-gather list
 613  * @sg_list: structure describing a scatter-gather list
 614  *
 615  * Memory for each element in the scatter-gather list is freed.
 616  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 617  */
 618 static inline void
 619 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 620 {
 621         struct scatterlist *sg;
 622         unsigned int i;
 623
 624         BUG_ON(sg_list == NULL);
 625
 626         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 627                 __free_pages(sg->page, 0);
 628
 629         sg_list->count = 0;
 630         kfree(sg_list->sg);
 631 }
 632
 633 /**
 634  * zfcp_sg_size - determine size of a scatter-gather list
 635  * @sg: array of (struct scatterlist)
 636  * @sg_count: elements in array
 637  * Return: size of entire scatter-gather list
 638  */
 639 size_t
 640 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 641 {
 642         unsigned int i;
 643         struct scatterlist *p;
 644         size_t size;
 645
 646         size = 0;
 647         for (i = 0, p = sg; i < sg_count; i++, p++) {
 648                 BUG_ON(p == NULL);
 649                 size += p->length;
 650         }
 651
 652         return size;
 653 }
 654
 655
 656 /**
 657  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 658  * @sg_list: structure describing a scatter-gather list
 659  * @user_buffer: pointer to buffer in user space
 660  * @size: number of bytes to be copied
 661  * Return: 0 on success, -EFAULT if copy_from_user fails.
 662  */
 663 static inline int
 664 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 665                             void __user *user_buffer,
 666                             size_t size)
 667 {
 668         struct scatterlist *sg;
 669         unsigned int length;
 670         void *zfcp_buffer;
 671         int retval = 0;
 672
 673         BUG_ON(sg_list == NULL);
 674
 675         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 676                 return -EFAULT;
 677
 678         for (sg = sg_list->sg; size > 0; sg++) {
 679                 length = min((unsigned int)size, sg->length);
 680                 zfcp_buffer = zfcp_sg_to_address(sg);
 681                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 682                         retval = -EFAULT;
 683                         goto out;
 684                 }
 685                 user_buffer += length;
 686                 size -= length;
 687         }
 688
 689  out:
 690         return retval;
 691 }
 692
 693
 694 /**
 695  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 696  * @user_buffer: pointer to buffer in user space
 697  * @sg_list: structure describing a scatter-gather list
 698  * @size: number of bytes to be copied
 699  * Return: 0 on success, -EFAULT if copy_to_user fails
 700  */
 701 static inline int
 702 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 703                           struct zfcp_sg_list *sg_list,
 704                           size_t size)
 705 {
 706         struct scatterlist *sg;
 707         unsigned int length;
 708         void *zfcp_buffer;
 709         int retval = 0;
 710
 711         BUG_ON(sg_list == NULL);
 712
 713         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 714                 return -EFAULT;
 715
 716         for (sg = sg_list->sg; size > 0; sg++) {
 717                 length = min((unsigned int) size, sg->length);
 718                 zfcp_buffer = zfcp_sg_to_address(sg);
 719                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 720                         retval = -EFAULT;
 721                         goto out;
 722                 }
 723                 user_buffer += length;
 724                 size -= length;
 725         }
 726
 727  out:
 728         return retval;
 729 }
 730
 731
 732 #undef ZFCP_LOG_AREA
 733
 734 /****************************************************************/
 735 /****** Functions for configuration/set-up of structures ********/
 736 /****************************************************************/
 737
 738 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 739
 740 /**
 741  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 742  * @port: pointer to port to search for unit
 743  * @fcp_lun: FCP LUN to search for
 744  * Traverse list of all units of a port and return pointer to a unit
 745  * with the given FCP LUN.
 746  */
 747 struct zfcp_unit *
 748 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 749 {
 750         struct zfcp_unit *unit;
 751         int found = 0;
 752
 753         list_for_each_entry(unit, &port->unit_list_head, list) {
 754                 if ((unit->fcp_lun == fcp_lun) &&
 755                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 756                 {
 757                         found = 1;
 758                         break;
 759                 }
 760         }
 761         return found ? unit : NULL;
 762 }
 763
 764 /**
 765  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 766  * @adapter: pointer to adapter to search for port
 767  * @wwpn: wwpn to search for
 768  * Traverse list of all ports of an adapter and return pointer to a port
 769  * with the given wwpn.
 770  */
 771 struct zfcp_port *
 772 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 773 {
 774         struct zfcp_port *port;
 775         int found = 0;
 776
 777         list_for_each_entry(port, &adapter->port_list_head, list) {
 778                 if ((port->wwpn == wwpn) &&
 779                     !(atomic_read(&port->status) &
 780                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 781                         found = 1;
 782                         break;
 783                 }
 784         }
 785         return found ? port : NULL;
 786 }
 787
 788 /**
 789  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 790  * @adapter: pointer to adapter to search for port
 791  * @d_id: d_id to search for
 792  * Traverse list of all ports of an adapter and return pointer to a port
 793  * with the given d_id.
 794  */
 795 struct zfcp_port *
 796 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 797 {
 798         struct zfcp_port *port;
 799         int found = 0;
 800
 801         list_for_each_entry(port, &adapter->port_list_head, list) {
 802                 if ((port->d_id == d_id) &&
 803                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 804                 {
 805                         found = 1;
 806                         break;
 807                 }
 808         }
 809         return found ? port : NULL;
 810 }
 811
 812 /**
 813  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 814  * @bus_id: bus_id to search for
 815  * Traverse list of all adapters and return pointer to an adapter
 816  * with the given bus_id.
 817  */
 818 struct zfcp_adapter *
 819 zfcp_get_adapter_by_busid(char *bus_id)
 820 {
 821         struct zfcp_adapter *adapter;
 822         int found = 0;
 823
 824         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 825                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 826                              BUS_ID_SIZE) == 0) &&
 827                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 828                                       &adapter->status)){
 829                         found = 1;
 830                         break;
 831                 }
 832         }
 833         return found ? adapter : NULL;
 834 }
 835
 836 /**
 837  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 838  * @port: pointer to port where unit is added
 839  * @fcp_lun: FCP LUN of unit to be enqueued
 840  * Return: pointer to enqueued unit on success, NULL on error
 841  * Locks: config_sema must be held to serialize changes to the unit list
 842  *
 843  * Sets up some unit internal structures and creates sysfs entry.
 844  */
 845 struct zfcp_unit *
 846 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 847 {
 848         struct zfcp_unit *unit, *tmp_unit;
 849         scsi_lun_t scsi_lun;
 850         int found;
 851
 852         /*
 853          * check that there is no unit with this FCP_LUN already in list
 854          * and enqueue it.
 855          * Note: Unlike for the adapter and the port, this is an error
 856          */
 857         read_lock_irq(&zfcp_data.config_lock);
 858         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 859         read_unlock_irq(&zfcp_data.config_lock);
 860         if (unit)
 861                 return NULL;
 862
 863         unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 864         if (!unit)
 865                 return NULL;
 866         memset(unit, 0, sizeof (struct zfcp_unit));
 867
 868         init_waitqueue_head(&unit->scsi_add_wq);
 869         /* initialise reference count stuff */
 870         atomic_set(&unit->refcount, 0);
 871         init_waitqueue_head(&unit->remove_wq);
 872
 873         unit->port = port;
 874         unit->fcp_lun = fcp_lun;
 875
 876         /* setup for sysfs registration */
 877         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 878         unit->sysfs_device.parent = &port->sysfs_device;
 879         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 880         dev_set_drvdata(&unit->sysfs_device, unit);
 881
 882         /* mark unit unusable as long as sysfs registration is not complete */
 883         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 884
 885         if (device_register(&unit->sysfs_device)) {
 886                 kfree(unit);
 887                 return NULL;
 888         }
 889
 890         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 891                 device_unregister(&unit->sysfs_device);
 892                 return NULL;
 893         }
 894
 895         zfcp_unit_get(unit);
 896
 897         scsi_lun = 0;
 898         found = 0;
 899         write_lock_irq(&zfcp_data.config_lock);
 900         list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
 901                 if (tmp_unit->scsi_lun != scsi_lun) {
 902                         found = 1;
 903                         break;
 904                 }
 905                 scsi_lun++;
 906         }
 907         unit->scsi_lun = scsi_lun;
 908         if (found)
 909                 list_add_tail(&unit->list, &tmp_unit->list);
 910         else
 911                 list_add_tail(&unit->list, &port->unit_list_head);
 912         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 913         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 914         write_unlock_irq(&zfcp_data.config_lock);
 915
 916         port->units++;
 917         zfcp_port_get(port);
 918
 919         return unit;
 920 }
 921
 922 void
 923 zfcp_unit_dequeue(struct zfcp_unit *unit)
 924 {
 925         zfcp_unit_wait(unit);
 926         write_lock_irq(&zfcp_data.config_lock);
 927         list_del(&unit->list);
 928         write_unlock_irq(&zfcp_data.config_lock);
 929         unit->port->units--;
 930         zfcp_port_put(unit->port);
 931         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 932         device_unregister(&unit->sysfs_device);
 933 }
 934
 935 static void *
 936 zfcp_mempool_alloc(int gfp_mask, void *size)
 937 {
 938         return kmalloc((size_t) size, gfp_mask);
 939 }
 940
 941 static void
 942 zfcp_mempool_free(void *element, void *size)
 943 {
 944         kfree(element);
 945 }
 946
 947 /*
 948  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 949  * commands.
 950  * It also genrates fcp-nameserver request/response buffer and unsolicited
 951  * status read fsf_req buffers.
 952  *
 953  * locks:       must only be called with zfcp_data.config_sema taken
 954  */
 955 static int
 956 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 957 {
 958         adapter->pool.fsf_req_erp =
 959                 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
 960                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 961                                sizeof(struct zfcp_fsf_req_pool_element));
 962
 963         if (NULL == adapter->pool.fsf_req_erp)
 964                 return -ENOMEM;
 965
 966         adapter->pool.fsf_req_scsi =
 967                 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
 968                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 969                                sizeof(struct zfcp_fsf_req_pool_element));
 970
 971         if (NULL == adapter->pool.fsf_req_scsi)
 972                 return -ENOMEM;
 973
 974         adapter->pool.fsf_req_abort =
 975                 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
 976                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
 977                                sizeof(struct zfcp_fsf_req_pool_element));
 978
 979         if (NULL == adapter->pool.fsf_req_abort)
 980                 return -ENOMEM;
 981
 982         adapter->pool.fsf_req_status_read =
 983                 mempool_create(ZFCP_POOL_STATUS_READ_NR,
 984                                zfcp_mempool_alloc, zfcp_mempool_free,
 985                                (void *) sizeof(struct zfcp_fsf_req));
 986
 987         if (NULL == adapter->pool.fsf_req_status_read)
 988                 return -ENOMEM;
 989
 990         adapter->pool.data_status_read =
 991                 mempool_create(ZFCP_POOL_STATUS_READ_NR,
 992                                zfcp_mempool_alloc, zfcp_mempool_free,
 993                                (void *) sizeof(struct fsf_status_read_buffer));
 994
 995         if (NULL == adapter->pool.data_status_read)
 996                 return -ENOMEM;
 997
 998         adapter->pool.data_gid_pn =
 999                 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
1000                                zfcp_mempool_alloc, zfcp_mempool_free, (void *)
1001                                sizeof(struct zfcp_gid_pn_data));
1002
1003         if (NULL == adapter->pool.data_gid_pn)
1004                 return -ENOMEM;
1005
1006         return 0;
1007 }
1008
1009 /**
1010  * zfcp_free_low_mem_buffers - free memory pools of an adapter
1011  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
1012  * locking:  zfcp_data.config_sema must be held
1013  */
1014 static void
1015 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1016 {
1017         if (adapter->pool.fsf_req_erp)
1018                 mempool_destroy(adapter->pool.fsf_req_erp);
1019         if (adapter->pool.fsf_req_scsi)
1020                 mempool_destroy(adapter->pool.fsf_req_scsi);
1021         if (adapter->pool.fsf_req_abort)
1022                 mempool_destroy(adapter->pool.fsf_req_abort);
1023         if (adapter->pool.fsf_req_status_read)
1024                 mempool_destroy(adapter->pool.fsf_req_status_read);
1025         if (adapter->pool.data_status_read)
1026                 mempool_destroy(adapter->pool.data_status_read);
1027         if (adapter->pool.data_gid_pn)
1028                 mempool_destroy(adapter->pool.data_gid_pn);
1029 }
1030
1031 /**
1032  * zfcp_adapter_debug_register - registers debug feature for an adapter
1033  * @adapter: pointer to adapter for which debug features should be registered
1034  * return: -ENOMEM on error, 0 otherwise
1035  */
1036 int
1037 zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
1038 {
1039         char dbf_name[20];
1040
1041         /* debug feature area which records SCSI command failures (hostbyte) */
1042         rwlock_init(&adapter->cmd_dbf_lock);
1043         sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
1044                 zfcp_get_busid_by_adapter(adapter));
1045         adapter->cmd_dbf = debug_register(dbf_name,
1046                                           ZFCP_CMD_DBF_INDEX,
1047                                           ZFCP_CMD_DBF_AREAS,
1048                                           ZFCP_CMD_DBF_LENGTH);
1049         debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
1050         debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
1051
1052         /* debug feature area which records SCSI command aborts */
1053         sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
1054                 zfcp_get_busid_by_adapter(adapter));
1055         adapter->abort_dbf = debug_register(dbf_name,
1056                                             ZFCP_ABORT_DBF_INDEX,
1057                                             ZFCP_ABORT_DBF_AREAS,
1058                                             ZFCP_ABORT_DBF_LENGTH);
1059         debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
1060         debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
1061
1062         /* debug feature area which records SCSI command aborts */
1063         sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
1064                 zfcp_get_busid_by_adapter(adapter));
1065         adapter->in_els_dbf = debug_register(dbf_name,
1066                                              ZFCP_IN_ELS_DBF_INDEX,
1067                                              ZFCP_IN_ELS_DBF_AREAS,
1068                                              ZFCP_IN_ELS_DBF_LENGTH);
1069         debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
1070         debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
1071
1072
1073         /* debug feature area which records erp events */
1074         sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
1075                 zfcp_get_busid_by_adapter(adapter));
1076         adapter->erp_dbf = debug_register(dbf_name,
1077                                           ZFCP_ERP_DBF_INDEX,
1078                                           ZFCP_ERP_DBF_AREAS,
1079                                           ZFCP_ERP_DBF_LENGTH);
1080         debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
1081         debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
1082
1083         if (adapter->cmd_dbf && adapter->abort_dbf &&
1084             adapter->in_els_dbf && adapter->erp_dbf)
1085                 return 0;
1086
1087         zfcp_adapter_debug_unregister(adapter);
1088         return -ENOMEM;
1089 }
1090
1091 /**
1092  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
1093  * @adapter: pointer to adapter for which debug features should be unregistered
1094  */
1095 void
1096 zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
1097 {
1098         debug_unregister(adapter->erp_dbf);
1099         debug_unregister(adapter->cmd_dbf);
1100         debug_unregister(adapter->abort_dbf);
1101         debug_unregister(adapter->in_els_dbf);
1102 }
1103
1104 void
1105 zfcp_dummy_release(struct device *dev)
1106 {
1107         return;
1108 }
1109
1110 /*
1111  * Enqueues an adapter at the end of the adapter list in the driver data.
1112  * All adapter internal structures are set up.
1113  * Proc-fs entries are also created.
1114  *
1115  * returns:     0             if a new adapter was successfully enqueued
1116  *              ZFCP_KNOWN    if an adapter with this devno was already present
1117  *              -ENOMEM       if alloc failed
1118  * locks:       config_sema must be held to serialise changes to the adapter list
1119  */
1120 struct zfcp_adapter *
1121 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1122 {
1123         int retval = 0;
1124         struct zfcp_adapter *adapter;
1125
1126         /*
1127          * Note: It is safe to release the list_lock, as any list changes
1128          * are protected by the config_sema, which must be held to get here
1129          */
1130
1131         /* try to allocate new adapter data structure (zeroed) */
1132         adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1133         if (!adapter) {
1134                 ZFCP_LOG_INFO("error: allocation of base adapter "
1135                               "structure failed\n");
1136                 goto out;
1137         }
1138         memset(adapter, 0, sizeof (struct zfcp_adapter));
1139
1140         ccw_device->handler = NULL;
1141
1142         /* save ccw_device pointer */
1143         adapter->ccw_device = ccw_device;
1144
1145         retval = zfcp_qdio_allocate_queues(adapter);
1146         if (retval)
1147                 goto queues_alloc_failed;
1148
1149         retval = zfcp_qdio_allocate(adapter);
1150         if (retval)
1151                 goto qdio_allocate_failed;
1152
1153         retval = zfcp_allocate_low_mem_buffers(adapter);
1154         if (retval) {
1155                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1156                 goto failed_low_mem_buffers;
1157         }
1158
1159         /* initialise reference count stuff */
1160         atomic_set(&adapter->refcount, 0);
1161         init_waitqueue_head(&adapter->remove_wq);
1162
1163         /* initialise list of ports */
1164         INIT_LIST_HEAD(&adapter->port_list_head);
1165
1166         /* initialise list of ports to be removed */
1167         INIT_LIST_HEAD(&adapter->port_remove_lh);
1168
1169         /* initialize list of fsf requests */
1170         rwlock_init(&adapter->fsf_req_list_lock);
1171         INIT_LIST_HEAD(&adapter->fsf_req_list_head);
1172
1173         /* initialize abort lock */
1174         rwlock_init(&adapter->abort_lock);
1175
1176         /* initialise some erp stuff */
1177         init_waitqueue_head(&adapter->erp_thread_wqh);
1178         init_waitqueue_head(&adapter->erp_done_wqh);
1179
1180         /* initialize lock of associated request queue */
1181         rwlock_init(&adapter->request_queue.queue_lock);
1182
1183         /* intitialise SCSI ER timer */
1184         init_timer(&adapter->scsi_er_timer);
1185
1186         /* set FC service class used per default */
1187         adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1188
1189         sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1190         ASCEBC(adapter->name, strlen(adapter->name));
1191
1192         /* mark adapter unusable as long as sysfs registration is not complete */
1193         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1194
1195         adapter->ccw_device = ccw_device;
1196         dev_set_drvdata(&ccw_device->dev, adapter);
1197
1198         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1199                 goto sysfs_failed;
1200
1201         adapter->generic_services.parent = &adapter->ccw_device->dev;
1202         adapter->generic_services.release = zfcp_dummy_release;
1203         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1204                  "generic_services");
1205
1206         if (device_register(&adapter->generic_services))
1207                 goto generic_services_failed;
1208
1209         /* put allocated adapter at list tail */
1210         write_lock_irq(&zfcp_data.config_lock);
1211         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1212         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1213         write_unlock_irq(&zfcp_data.config_lock);
1214
1215         zfcp_data.adapters++;
1216
1217         goto out;
1218
1219  generic_services_failed:
1220         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1221  sysfs_failed:
1222         dev_set_drvdata(&ccw_device->dev, NULL);
1223  failed_low_mem_buffers:
1224         zfcp_free_low_mem_buffers(adapter);
1225         if (qdio_free(ccw_device) != 0)
1226                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1227                                 zfcp_get_busid_by_adapter(adapter));
1228  qdio_allocate_failed:
1229         zfcp_qdio_free_queues(adapter);
1230  queues_alloc_failed:
1231         kfree(adapter);
1232         adapter = NULL;
1233  out:
1234         return adapter;
1235 }
1236
1237 /*
1238  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1239  *              !0 - struct zfcp_adapter  data structure could not be removed
1240  *                      (e.g. still used)
1241  * locks:       adapter list write lock is assumed to be held by caller
1242  *              adapter->fsf_req_list_lock is taken and released within this
1243  *              function and must not be held on entry
1244  */
1245 void
1246 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1247 {
1248         int retval = 0;
1249         unsigned long flags;
1250
1251         device_unregister(&adapter->generic_services);
1252         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1253         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1254         /* sanity check: no pending FSF requests */
1255         read_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1256         retval = !list_empty(&adapter->fsf_req_list_head);
1257         read_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1258         if (retval) {
1259                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1260                                 "%i requests outstanding\n",
1261                                 zfcp_get_busid_by_adapter(adapter), adapter,
1262                                 atomic_read(&adapter->fsf_reqs_active));
1263                 retval = -EBUSY;
1264                 goto out;
1265         }
1266
1267         /* remove specified adapter data structure from list */
1268         write_lock_irq(&zfcp_data.config_lock);
1269         list_del(&adapter->list);
1270         write_unlock_irq(&zfcp_data.config_lock);
1271
1272         /* decrease number of adapters in list */
1273         zfcp_data.adapters--;
1274
1275         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1276                        "%i adapters still in list\n",
1277                        zfcp_get_busid_by_adapter(adapter),
1278                        adapter, zfcp_data.adapters);
1279
1280         retval = qdio_free(adapter->ccw_device);
1281         if (retval)
1282                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1283                                 zfcp_get_busid_by_adapter(adapter));
1284
1285         zfcp_free_low_mem_buffers(adapter);
1286         /* free memory of adapter data structure and queues */
1287         zfcp_qdio_free_queues(adapter);
1288         ZFCP_LOG_TRACE("freeing adapter structure\n");
1289         kfree(adapter);
1290  out:
1291         return;
1292 }
1293
1294 /**
1295  * zfcp_port_enqueue - enqueue port to port list of adapter
1296  * @adapter: adapter where remote port is added
1297  * @wwpn: WWPN of the remote port to be enqueued
1298  * @status: initial status for the port
1299  * @d_id: destination id of the remote port to be enqueued
1300  * Return: pointer to enqueued port on success, NULL on error
1301  * Locks: config_sema must be held to serialize changes to the port list
1302  *
1303  * All port internal structures are set up and the sysfs entry is generated.
1304  * d_id is used to enqueue ports with a well known address like the Directory
1305  * Service for nameserver lookup.
1306  */
1307 struct zfcp_port *
1308 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1309                   u32 d_id)
1310 {
1311         struct zfcp_port *port, *tmp_port;
1312         int check_wwpn;
1313         scsi_id_t scsi_id;
1314         int found;
1315
1316         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1317
1318         /*
1319          * check that there is no port with this WWPN already in list
1320          */
1321         if (check_wwpn) {
1322                 read_lock_irq(&zfcp_data.config_lock);
1323                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1324                 read_unlock_irq(&zfcp_data.config_lock);
1325                 if (port)
1326                         return NULL;
1327         }
1328
1329         port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1330         if (!port)
1331                 return NULL;
1332         memset(port, 0, sizeof (struct zfcp_port));
1333
1334         /* initialise reference count stuff */
1335         atomic_set(&port->refcount, 0);
1336         init_waitqueue_head(&port->remove_wq);
1337
1338         INIT_LIST_HEAD(&port->unit_list_head);
1339         INIT_LIST_HEAD(&port->unit_remove_lh);
1340
1341         port->adapter = adapter;
1342
1343         if (check_wwpn)
1344                 port->wwpn = wwpn;
1345
1346         atomic_set_mask(status, &port->status);
1347
1348         /* setup for sysfs registration */
1349         if (status & ZFCP_STATUS_PORT_WKA) {
1350                 switch (d_id) {
1351                 case ZFCP_DID_DIRECTORY_SERVICE:
1352                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1353                                  "directory");
1354                         break;
1355                 case ZFCP_DID_MANAGEMENT_SERVICE:
1356                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1357                                  "management");
1358                         break;
1359                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1360                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1361                                  "key_distribution");
1362                         break;
1363                 case ZFCP_DID_ALIAS_SERVICE:
1364                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1365                                  "alias");
1366                         break;
1367                 case ZFCP_DID_TIME_SERVICE:
1368                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1369                                  "time");
1370                         break;
1371                 default:
1372                         kfree(port);
1373                         return NULL;
1374                 }
1375                 port->d_id = d_id;
1376                 port->sysfs_device.parent = &adapter->generic_services;
1377         } else {
1378                 snprintf(port->sysfs_device.bus_id,
1379                          BUS_ID_SIZE, "0x%016llx", wwpn);
1380         port->sysfs_device.parent = &adapter->ccw_device->dev;
1381         }
1382         port->sysfs_device.release = zfcp_sysfs_port_release;
1383         dev_set_drvdata(&port->sysfs_device, port);
1384
1385         /* mark port unusable as long as sysfs registration is not complete */
1386         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1387
1388         if (device_register(&port->sysfs_device)) {
1389                 kfree(port);
1390                 return NULL;
1391         }
1392
1393         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1394                 device_unregister(&port->sysfs_device);
1395                 return NULL;
1396         }
1397
1398         zfcp_port_get(port);
1399
1400         scsi_id = 1;
1401         found = 0;
1402         write_lock_irq(&zfcp_data.config_lock);
1403         list_for_each_entry(tmp_port, &adapter->port_list_head, list) {
1404                 if (atomic_test_mask(ZFCP_STATUS_PORT_NO_SCSI_ID,
1405                                      &tmp_port->status))
1406                         continue;
1407                 if (tmp_port->scsi_id != scsi_id) {
1408                         found = 1;
1409                         break;
1410                 }
1411                 scsi_id++;
1412         }
1413         port->scsi_id = scsi_id;
1414         if (found)
1415                 list_add_tail(&port->list, &tmp_port->list);
1416         else
1417                 list_add_tail(&port->list, &adapter->port_list_head);
1418         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1419         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1420         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1421                 if (!adapter->nameserver_port)
1422                         adapter->nameserver_port = port;
1423         adapter->ports++;
1424         write_unlock_irq(&zfcp_data.config_lock);
1425
1426         zfcp_adapter_get(adapter);
1427
1428         return port;
1429 }
1430
1431 void
1432 zfcp_port_dequeue(struct zfcp_port *port)
1433 {
1434         zfcp_port_wait(port);
1435         write_lock_irq(&zfcp_data.config_lock);
1436         list_del(&port->list);
1437         port->adapter->ports--;
1438         write_unlock_irq(&zfcp_data.config_lock);
1439         zfcp_adapter_put(port->adapter);
1440         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1441                                      atomic_read(&port->status));
1442         device_unregister(&port->sysfs_device);
1443 }
1444
1445 /* Enqueues a nameserver port */
1446 int
1447 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1448 {
1449         struct zfcp_port *port;
1450
1451         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1452                                  ZFCP_DID_DIRECTORY_SERVICE);
1453         if (!port) {
1454                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1455                               "adapter %s failed\n",
1456                               zfcp_get_busid_by_adapter(adapter));
1457                 return -ENXIO;
1458         }
1459         zfcp_port_put(port);
1460
1461         return 0;
1462 }
1463
1464 #undef ZFCP_LOG_AREA
1465
1466 /****************************************************************/
1467 /******* Fibre Channel Standard related Functions  **************/
1468 /****************************************************************/
1469
1470 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1471
1472 void
1473 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1474                            struct fsf_status_read_buffer *status_buffer)
1475 {
1476         struct fcp_rscn_head *fcp_rscn_head;
1477         struct fcp_rscn_element *fcp_rscn_element;
1478         struct zfcp_port *port;
1479         u16 i;
1480         u16 no_entries;
1481         u32 range_mask;
1482         unsigned long flags;
1483
1484         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1485         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1486
1487         /* see FC-FS */
1488         no_entries = (fcp_rscn_head->payload_len / 4);
1489
1490         zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
1491                               fcp_rscn_head->payload_len);
1492
1493         debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
1494         for (i = 1; i < no_entries; i++) {
1495                 /* skip head and start with 1st element */
1496                 fcp_rscn_element++;
1497                 switch (fcp_rscn_element->addr_format) {
1498                 case ZFCP_PORT_ADDRESS:
1499                         ZFCP_LOG_FLAGS(1, "ZFCP_PORT_ADDRESS\n");
1500                         range_mask = ZFCP_PORTS_RANGE_PORT;
1501                         break;
1502                 case ZFCP_AREA_ADDRESS:
1503                         ZFCP_LOG_FLAGS(1, "ZFCP_AREA_ADDRESS\n");
1504                         range_mask = ZFCP_PORTS_RANGE_AREA;
1505                         break;
1506                 case ZFCP_DOMAIN_ADDRESS:
1507                         ZFCP_LOG_FLAGS(1, "ZFCP_DOMAIN_ADDRESS\n");
1508                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1509                         break;
1510                 case ZFCP_FABRIC_ADDRESS:
1511                         ZFCP_LOG_FLAGS(1, "ZFCP_FABRIC_ADDRESS\n");
1512                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1513                         break;
1514                 default:
1515                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1516                                       "address format\n");
1517                         continue;
1518                 }
1519                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1520                 list_for_each_entry(port, &adapter->port_list_head, list) {
1521                         if (atomic_test_mask
1522                             (ZFCP_STATUS_PORT_WKA, &port->status))
1523                                 continue;
1524                         /* Do we know this port? If not skip it. */
1525                         if (!atomic_test_mask
1526                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1527                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1528                                               "port 0x%016Lx\n", port->wwpn);
1529                                 debug_text_event(adapter->erp_dbf, 1,
1530                                                  "unsol_els_rscnu:");
1531                                 zfcp_erp_port_reopen(port,
1532                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1533                                 continue;
1534                         }
1535
1536                         /*
1537                          * FIXME: race: d_id might being invalidated
1538                          * (...DID_DID reset)
1539                          */
1540                         if ((port->d_id & range_mask)
1541                             == (fcp_rscn_element->nport_did & range_mask)) {
1542                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1543                                                fcp_rscn_element->nport_did);
1544                                 /*
1545                                  * Unfortunately, an RSCN does not specify the
1546                                  * type of change a target underwent. We assume
1547                                  * that it makes sense to reopen the link.
1548                                  * FIXME: Shall we try to find out more about
1549                                  * the target and link state before closing it?
1550                                  * How to accomplish this? (nameserver?)
1551                                  * Where would such code be put in?
1552                                  * (inside or outside erp)
1553                                  */
1554                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1555                                               "port 0x%016Lx\n", port->wwpn);
1556                                 debug_text_event(adapter->erp_dbf, 1,
1557                                                  "unsol_els_rscnk:");
1558                                 zfcp_test_link(port);
1559                         }
1560                 }
1561                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1562         }
1563 }
1564
1565 static void
1566 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1567                             struct fsf_status_read_buffer *status_buffer)
1568 {
1569         logi *els_logi = (logi *) status_buffer->payload;
1570         struct zfcp_port *port;
1571         unsigned long flags;
1572
1573         zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
1574
1575         read_lock_irqsave(&zfcp_data.config_lock, flags);
1576         list_for_each_entry(port, &adapter->port_list_head, list) {
1577                 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1578                         break;
1579         }
1580         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1581
1582         if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1583                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1584                                "with d_id 0x%08x on adapter %s\n",
1585                                status_buffer->d_id,
1586                                zfcp_get_busid_by_adapter(adapter));
1587         } else {
1588                 debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
1589                 debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
1590                 zfcp_erp_port_forced_reopen(port, 0);
1591         }
1592 }
1593
1594 static void
1595 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1596                            struct fsf_status_read_buffer *status_buffer)
1597 {
1598         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1599         struct zfcp_port *port;
1600         unsigned long flags;
1601
1602         zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
1603
1604         read_lock_irqsave(&zfcp_data.config_lock, flags);
1605         list_for_each_entry(port, &adapter->port_list_head, list) {
1606                 if (port->wwpn == els_logo->nport_wwpn)
1607                         break;
1608         }
1609         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1610
1611         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1612                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1613                                "with d_id 0x%08x on adapter %s\n",
1614                                status_buffer->d_id,
1615                                zfcp_get_busid_by_adapter(adapter));
1616         } else {
1617                 debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
1618                 debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
1619                 zfcp_erp_port_forced_reopen(port, 0);
1620         }
1621 }
1622
1623 static void
1624 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1625                               struct fsf_status_read_buffer *status_buffer)
1626 {
1627         zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
1628         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1629                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1630                         zfcp_get_busid_by_adapter(adapter));
1631
1632 }
1633
1634 void
1635 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1636 {
1637         struct fsf_status_read_buffer *status_buffer;
1638         u32 els_type;
1639         struct zfcp_adapter *adapter;
1640
1641         status_buffer = fsf_req->data.status_read.buffer;
1642         els_type = *(u32 *) (status_buffer->payload);
1643         adapter = fsf_req->adapter;
1644
1645         if (els_type == LS_PLOGI)
1646                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1647         else if (els_type == LS_LOGO)
1648                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1649         else if ((els_type & 0xffff0000) == LS_RSCN)
1650                 /* we are only concerned with the command, not the length */
1651                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1652         else
1653                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1654
1655 }
1656
1657
1658 /**
1659  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1660  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1661  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1662  */
1663 static int
1664 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1665 {
1666         struct zfcp_gid_pn_data *data;
1667
1668         if (pool != NULL) {
1669                 data = mempool_alloc(pool, GFP_ATOMIC);
1670                 if (likely(data != NULL)) {
1671                         data->ct.pool = pool;
1672                 }
1673         } else {
1674                 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1675         }
1676
1677         if (NULL == data)
1678                 return -ENOMEM;
1679
1680         memset(data, 0, sizeof(*data));
1681         data->ct.req = &data->req;
1682         data->ct.resp = &data->resp;
1683         data->ct.req_count = data->ct.resp_count = 1;
1684         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1685         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1686         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1687         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1688
1689         *gid_pn = data;
1690         return 0;
1691 }
1692
1693 /**
1694  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1695  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1696  */
1697 static void
1698 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1699 {
1700         if ((gid_pn->ct.pool != 0))
1701                 mempool_free(gid_pn, gid_pn->ct.pool);
1702         else
1703                 kfree(gid_pn);
1704
1705         return;
1706 }
1707
1708 /**
1709  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1710  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1711  */
1712 int
1713 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1714 {
1715         int ret;
1716         struct ct_iu_gid_pn_req *ct_iu_req;
1717         struct zfcp_gid_pn_data *gid_pn;
1718         struct zfcp_adapter *adapter = erp_action->adapter;
1719
1720         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1721         if (ret < 0) {
1722                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1723                               "request failed for adapter %s\n",
1724                               zfcp_get_busid_by_adapter(adapter));
1725                 goto out;
1726         }
1727
1728         /* setup nameserver request */
1729         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1730         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1731         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1732         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1733         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1734         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1735         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1736         ct_iu_req->wwpn = erp_action->port->wwpn;
1737
1738         /* setup parameters for send generic command */
1739         gid_pn->ct.port = adapter->nameserver_port;
1740         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1741         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1742         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1743         gid_pn->ct.timer = &erp_action->timer;
1744         gid_pn->port = erp_action->port;
1745
1746         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1747                                erp_action);
1748         if (ret) {
1749                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1750                               "failed for adapter %s\n",
1751                               zfcp_get_busid_by_adapter(adapter));
1752
1753                 zfcp_gid_pn_buffers_free(gid_pn);
1754         }
1755
1756  out:
1757         return ret;
1758 }
1759
1760 /**
1761  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1762  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1763  */
1764 static void zfcp_ns_gid_pn_handler(unsigned long data)
1765 {
1766         struct zfcp_port *port;
1767         struct zfcp_send_ct *ct;
1768         struct ct_iu_gid_pn_req *ct_iu_req;
1769         struct ct_iu_gid_pn_resp *ct_iu_resp;
1770         struct zfcp_gid_pn_data *gid_pn;
1771
1772
1773         gid_pn = (struct zfcp_gid_pn_data *) data;
1774         port = gid_pn->port;
1775         ct = &gid_pn->ct;
1776         ct_iu_req = zfcp_sg_to_address(ct->req);
1777         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1778
1779         if ((ct->status != 0) || zfcp_check_ct_response(&ct_iu_resp->header)) {
1780                 /* FIXME: do we need some specific erp entry points */
1781                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1782                 goto failed;
1783         }
1784         /* paranoia */
1785         if (ct_iu_req->wwpn != port->wwpn) {
1786                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1787                                 "lookup does not match expected wwpn 0x%016Lx "
1788                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1789                                 zfcp_get_busid_by_port(port));
1790                 goto mismatch;
1791         }
1792
1793         /* looks like a valid d_id */
1794         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1795         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1796         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%08x\n",
1797                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1798         goto out;
1799
1800  mismatch:
1801         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1802         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1803                       sizeof(struct ct_iu_gid_pn_req));
1804         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1805                       sizeof(struct ct_iu_gid_pn_resp));
1806
1807  failed:
1808         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1809                         "0x%016Lx for adapter %s\n",
1810                         port->wwpn, zfcp_get_busid_by_port(port));
1811  out:
1812         zfcp_gid_pn_buffers_free(gid_pn);
1813         return;
1814 }
1815
1816 /* reject CT_IU reason codes acc. to FC-GS-4 */
1817 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1818         {0x01, "invalid command code"},
1819         {0x02, "invalid version level"},
1820         {0x03, "logical error"},
1821         {0x04, "invalid CT_IU size"},
1822         {0x05, "logical busy"},
1823         {0x07, "protocol error"},
1824         {0x09, "unable to perform command request"},
1825         {0x0b, "command not supported"},
1826         {0x0d, "server not available"},
1827         {0x0e, "session could not be established"},
1828         {0xff, "vendor specific error"},
1829         {0, NULL},
1830 };
1831
1832 /* LS_RJT reason codes acc. to FC-FS */
1833 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1834         {0x01, "invalid LS_Command code"},
1835         {0x03, "logical error"},
1836         {0x05, "logical busy"},
1837         {0x07, "protocol error"},
1838         {0x09, "unable to perform command request"},
1839         {0x0b, "command not supported"},
1840         {0x0e, "command already in progress"},
1841         {0xff, "vendor specific error"},
1842         {0, NULL},
1843 };
1844
1845 /* reject reason codes according to FC-PH/FC-FS */
1846 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1847         {0x01, "invalid D_ID"},
1848         {0x02, "invalid S_ID"},
1849         {0x03, "Nx_Port not available, temporary"},
1850         {0x04, "Nx_Port not available, permament"},
1851         {0x05, "class not supported"},
1852         {0x06, "delimiter usage error"},
1853         {0x07, "TYPE not supported"},
1854         {0x08, "invalid Link_Control"},
1855         {0x09, "invalid R_CTL field"},
1856         {0x0a, "invalid F_CTL field"},
1857         {0x0b, "invalid OX_ID"},
1858         {0x0c, "invalid RX_ID"},
1859         {0x0d, "invalid SEQ_ID"},
1860         {0x0e, "invalid DF_CTL"},
1861         {0x0f, "invalid SEQ_CNT"},
1862         {0x10, "invalid parameter field"},
1863         {0x11, "exchange error"},
1864         {0x12, "protocol error"},
1865         {0x13, "incorrect length"},
1866         {0x14, "unsupported ACK"},
1867         {0x15, "class of service not supported by entity at FFFFFE"},
1868         {0x16, "login required"},
1869         {0x17, "excessive sequences attempted"},
1870         {0x18, "unable to establish exchange"},
1871         {0x1a, "fabric path not available"},
1872         {0x1b, "invalid VC_ID (class 4)"},
1873         {0x1c, "invalid CS_CTL field"},
1874         {0x1d, "insufficient resources for VC (class 4)"},
1875         {0x1f, "invalid class of service"},
1876         {0x20, "preemption request rejected"},
1877         {0x21, "preemption not enabled"},
1878         {0x22, "multicast error"},
1879         {0x23, "multicast error terminate"},
1880         {0x24, "process login required"},
1881         {0xff, "vendor specific reject"},
1882         {0, NULL},
1883 };
1884
1885 /**
1886  * zfcp_rc_description - return description for given reaon code
1887  * @code: reason code
1888  * @rc_table: table of reason codes and descriptions
1889  */
1890 static inline const char *
1891 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1892 {
1893         const char *descr = "unknown reason code";
1894
1895         do {
1896                 if (code == rc_table->code) {
1897                         descr = rc_table->description;
1898                         break;
1899                 }
1900                 rc_table++;
1901         } while (rc_table->code && rc_table->description);
1902
1903         return descr;
1904 }
1905
1906 /**
1907  * zfcp_check_ct_response - evaluate reason code for CT_IU
1908  * @rjt: response payload to an CT_IU request
1909  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1910  */
1911 int
1912 zfcp_check_ct_response(struct ct_hdr *rjt)
1913 {
1914         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1915                 return 0;
1916
1917         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1918                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1919                                 "response code (0x%04hx)\n",
1920                                 rjt->cmd_rsp_code);
1921                 return 1;
1922         }
1923
1924         ZFCP_LOG_INFO("Generic Service command rejected\n");
1925         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1926                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1927                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1928                       (u32) rjt->vendor_unique);
1929
1930         return 1;
1931 }
1932
1933 /**
1934  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1935  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1936  * @rc_table: table of reason codes and descriptions
1937  */
1938 static inline void
1939 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1940                    const struct zfcp_rc_entry *rc_table)
1941 {
1942         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1943                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1944                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1945                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1946 }
1947
1948 /**
1949  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1950  * @sq: status qualifier word
1951  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1952  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1953  */
1954 int
1955 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1956 {
1957         int ret = -EIO;
1958
1959         if (sq == FSF_IOSTAT_NPORT_RJT) {
1960                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1961                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1962                 /* invalid d_id */
1963                 if (rjt_par->reason_code == 0x01)
1964                         ret = -EREMCHG;
1965         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1966                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1967                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1968                 /* invalid d_id */
1969                 if (rjt_par->reason_code == 0x01)
1970                         ret = -EREMCHG;
1971         } else if (sq == FSF_IOSTAT_LS_RJT) {
1972                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1973                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1974                 ret = -EREMOTEIO;
1975         } else
1976                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1977
1978         return ret;
1979 }
1980
1981 #undef ZFCP_LOG_AREA