drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/sched.h>        /* workqueue stuff, HZ */
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include "scsi_priv.h"
  36
  37 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  38
  39 /*
  40  * Redefine so that we can have same named attributes in the
  41  * sdev/starget/host objects.
  42  */
  43 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  44 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  45         __ATTR(_name,_mode,_show,_store)
  46
  47 #define fc_enum_name_search(title, table_type, table)                   \
  48 static const char *get_fc_##title##_name(enum table_type table_key)     \
  49 {                                                                       \
  50         int i;                                                          \
  51         char *name = NULL;                                              \
  52                                                                         \
  53         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  54                 if (table[i].value == table_key) {                      \
  55                         name = table[i].name;                           \
  56                         break;                                          \
  57                 }                                                       \
  58         }                                                               \
  59         return name;                                                    \
  60 }
  61
  62 #define fc_enum_name_match(title, table_type, table)                    \
  63 static int get_fc_##title##_match(const char *table_key,                \
  64                 enum table_type *value)                                 \
  65 {                                                                       \
  66         int i;                                                          \
  67                                                                         \
  68         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  69                 if (strncmp(table_key, table[i].name,                   \
  70                                 table[i].matchlen) == 0) {              \
  71                         *value = table[i].value;                        \
  72                         return 0; /* success */                         \
  73                 }                                                       \
  74         }                                                               \
  75         return 1; /* failure */                                         \
  76 }
  77
  78
  79 /* Convert fc_port_type values to ascii string name */
  80 static struct {
  81         enum fc_port_type       value;
  82         char                    *name;
  83 } fc_port_type_names[] = {
  84         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  85         { FC_PORTTYPE_OTHER,            "Other" },
  86         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  87         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  88         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  89         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  90         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  91 };
  92 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  93 #define FC_PORTTYPE_MAX_NAMELEN         50
  94
  95
  96 /* Convert fc_port_state values to ascii string name */
  97 static struct {
  98         enum fc_port_state      value;
  99         char                    *name;
 100 } fc_port_state_names[] = {
 101         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 102         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 103         { FC_PORTSTATE_ONLINE,          "Online" },
 104         { FC_PORTSTATE_OFFLINE,         "Offline" },
 105         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 106         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 107         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 108         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 109         { FC_PORTSTATE_ERROR,           "Error" },
 110         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 111         { FC_PORTSTATE_DELETED,         "Deleted" },
 112 };
 113 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 114 #define FC_PORTSTATE_MAX_NAMELEN        20
 115
 116
 117 /* Convert fc_tgtid_binding_type values to ascii string name */
 118 static const struct {
 119         enum fc_tgtid_binding_type      value;
 120         char                            *name;
 121         int                             matchlen;
 122 } fc_tgtid_binding_type_names[] = {
 123         { FC_TGTID_BIND_NONE, "none", 4 },
 124         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 125         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 126         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 127 };
 128 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 129                 fc_tgtid_binding_type_names)
 130 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 131                 fc_tgtid_binding_type_names)
 132 #define FC_BINDTYPE_MAX_NAMELEN 30
 133
 134
 135 #define fc_bitfield_name_search(title, table)                   \
 136 static ssize_t                                                  \
 137 get_fc_##title##_names(u32 table_key, char *buf)                \
 138 {                                                               \
 139         char *prefix = "";                                      \
 140         ssize_t len = 0;                                        \
 141         int i;                                                  \
 142                                                                 \
 143         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 144                 if (table[i].value & table_key) {               \
 145                         len += sprintf(buf + len, "%s%s",       \
 146                                 prefix, table[i].name);         \
 147                         prefix = ", ";                          \
 148                 }                                               \
 149         }                                                       \
 150         len += sprintf(buf + len, "\n");                        \
 151         return len;                                             \
 152 }
 153
 154
 155 /* Convert FC_COS bit values to ascii string name */
 156 static const struct {
 157         u32                     value;
 158         char                    *name;
 159 } fc_cos_names[] = {
 160         { FC_COS_CLASS1,        "Class 1" },
 161         { FC_COS_CLASS2,        "Class 2" },
 162         { FC_COS_CLASS3,        "Class 3" },
 163         { FC_COS_CLASS4,        "Class 4" },
 164         { FC_COS_CLASS6,        "Class 6" },
 165 };
 166 fc_bitfield_name_search(cos, fc_cos_names)
 167
 168
 169 /* Convert FC_PORTSPEED bit values to ascii string name */
 170 static const struct {
 171         u32                     value;
 172         char                    *name;
 173 } fc_port_speed_names[] = {
 174         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 175         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 176         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 177         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 178         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 179 };
 180 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 181
 182
 183 static int
 184 show_fc_fc4s (char *buf, u8 *fc4_list)
 185 {
 186         int i, len=0;
 187
 188         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 189                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 190         len += sprintf(buf + len, "\n");
 191         return len;
 192 }
 193
 194
 195 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 196 static const struct {
 197         u32                     value;
 198         char                    *name;
 199 } fc_remote_port_role_names[] = {
 200         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 201         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 202         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 203 };
 204 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 205
 206 /*
 207  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 208  */
 209 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 210 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 211 #define FC_FPORT_PORTID                 0x00000e
 212 #define FC_FABCTLR_PORTID               0x00000d
 213 #define FC_DIRSRVR_PORTID               0x00000c
 214 #define FC_TIMESRVR_PORTID              0x00000b
 215 #define FC_MGMTSRVR_PORTID              0x00000a
 216
 217
 218 static void fc_timeout_deleted_rport(void *data);
 219 static void fc_scsi_scan_rport(void *data);
 220
 221 /*
 222  * Attribute counts pre object type...
 223  * Increase these values if you add attributes
 224  */
 225 #define FC_STARGET_NUM_ATTRS    3
 226 #define FC_RPORT_NUM_ATTRS      9
 227 #define FC_HOST_NUM_ATTRS       17
 228
 229 struct fc_internal {
 230         struct scsi_transport_template t;
 231         struct fc_function_template *f;
 232
 233         /*
 234          * For attributes : each object has :
 235          *   An array of the actual attributes structures
 236          *   An array of null-terminated pointers to the attribute
 237          *     structures - used for mid-layer interaction.
 238          *
 239          * The attribute containers for the starget and host are are
 240          * part of the midlayer. As the remote port is specific to the
 241          * fc transport, we must provide the attribute container.
 242          */
 243         struct class_device_attribute private_starget_attrs[
 244                                                         FC_STARGET_NUM_ATTRS];
 245         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 246
 247         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 248         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 249
 250         struct transport_container rport_attr_cont;
 251         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 252         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 253 };
 254
 255 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 256
 257 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 258                            struct class_device *cdev)
 259 {
 260         struct scsi_target *starget = to_scsi_target(dev);
 261         struct fc_rport *rport = starget_to_rport(starget);
 262
 263         /*
 264          * if parent is remote port, use values from remote port.
 265          * Otherwise, this host uses the fc_transport, but not the
 266          * remote port interface. As such, initialize to known non-values.
 267          */
 268         if (rport) {
 269                 fc_starget_node_name(starget) = rport->node_name;
 270                 fc_starget_port_name(starget) = rport->port_name;
 271                 fc_starget_port_id(starget) = rport->port_id;
 272         } else {
 273                 fc_starget_node_name(starget) = -1;
 274                 fc_starget_port_name(starget) = -1;
 275                 fc_starget_port_id(starget) = -1;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 282                                "fc_transport",
 283                                fc_target_setup,
 284                                NULL,
 285                                NULL);
 286
 287 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 288                          struct class_device *cdev)
 289 {
 290         struct Scsi_Host *shost = dev_to_shost(dev);
 291         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 292
 293         /*
 294          * Set default values easily detected by the midlayer as
 295          * failure cases.  The scsi lldd is responsible for initializing
 296          * all transport attributes to valid values per host.
 297          */
 298         fc_host->node_name = -1;
 299         fc_host->port_name = -1;
 300         fc_host->permanent_port_name = -1;
 301         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 302         memset(fc_host->supported_fc4s, 0,
 303                 sizeof(fc_host->supported_fc4s));
 304         memset(fc_host->symbolic_name, 0,
 305                 sizeof(fc_host->symbolic_name));
 306         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 307         fc_host->maxframe_size = -1;
 308         memset(fc_host->serial_number, 0,
 309                 sizeof(fc_host->serial_number));
 310
 311         fc_host->port_id = -1;
 312         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 313         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 314         memset(fc_host->active_fc4s, 0,
 315                 sizeof(fc_host->active_fc4s));
 316         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 317         fc_host->fabric_name = -1;
 318
 319         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 320
 321         INIT_LIST_HEAD(&fc_host->rports);
 322         INIT_LIST_HEAD(&fc_host->rport_bindings);
 323         fc_host->next_rport_number = 0;
 324         fc_host->next_target_id = 0;
 325
 326         snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
 327                 shost->host_no);
 328         fc_host->work_q = create_singlethread_workqueue(
 329                                         fc_host->work_q_name);
 330         if (!fc_host->work_q)
 331                 return -ENOMEM;
 332
 333         snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
 334                 shost->host_no);
 335         fc_host->devloss_work_q = create_singlethread_workqueue(
 336                                         fc_host->devloss_work_q_name);
 337         if (!fc_host->devloss_work_q) {
 338                 destroy_workqueue(fc_host->work_q);
 339                 fc_host->work_q = NULL;
 340                 return -ENOMEM;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 347                                "fc_host",
 348                                fc_host_setup,
 349                                NULL,
 350                                NULL);
 351
 352 /*
 353  * Setup and Remove actions for remote ports are handled
 354  * in the service functions below.
 355  */
 356 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 357                                "fc_remote_ports",
 358                                NULL,
 359                                NULL,
 360                                NULL);
 361
 362 /*
 363  * Module Parameters
 364  */
 365
 366 /*
 367  * dev_loss_tmo: the default number of seconds that the FC transport
 368  *   should insulate the loss of a remote port.
 369  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 370  */
 371 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 372
 373 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 374 MODULE_PARM_DESC(dev_loss_tmo,
 375                  "Maximum number of seconds that the FC transport should"
 376                  " insulate the loss of a remote port. Once this value is"
 377                  " exceeded, the scsi target is removed. Value should be"
 378                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 379
 380
 381 static __init int fc_transport_init(void)
 382 {
 383         int error = transport_class_register(&fc_host_class);
 384         if (error)
 385                 return error;
 386         error = transport_class_register(&fc_rport_class);
 387         if (error)
 388                 return error;
 389         return transport_class_register(&fc_transport_class);
 390 }
 391
 392 static void __exit fc_transport_exit(void)
 393 {
 394         transport_class_unregister(&fc_transport_class);
 395         transport_class_unregister(&fc_rport_class);
 396         transport_class_unregister(&fc_host_class);
 397 }
 398
 399 /*
 400  * FC Remote Port Attribute Management
 401  */
 402
 403 #define fc_rport_show_function(field, format_string, sz, cast)          \
 404 static ssize_t                                                          \
 405 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 406 {                                                                       \
 407         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 408         struct Scsi_Host *shost = rport_to_shost(rport);                \
 409         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 410         if ((i->f->get_rport_##field) &&                                \
 411             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 412               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 413               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 414                 i->f->get_rport_##field(rport);                         \
 415         return snprintf(buf, sz, format_string, cast rport->field);     \
 416 }
 417
 418 #define fc_rport_store_function(field)                                  \
 419 static ssize_t                                                          \
 420 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 421                            size_t count)                                \
 422 {                                                                       \
 423         int val;                                                        \
 424         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 425         struct Scsi_Host *shost = rport_to_shost(rport);                \
 426         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 427         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 428             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 429             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 430                 return -EBUSY;                                          \
 431         val = simple_strtoul(buf, NULL, 0);                             \
 432         i->f->set_rport_##field(rport, val);                            \
 433         return count;                                                   \
 434 }
 435
 436 #define fc_rport_rd_attr(field, format_string, sz)                      \
 437         fc_rport_show_function(field, format_string, sz, )              \
 438 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 439                          show_fc_rport_##field, NULL)
 440
 441 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 442         fc_rport_show_function(field, format_string, sz, (cast))        \
 443 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 444                           show_fc_rport_##field, NULL)
 445
 446 #define fc_rport_rw_attr(field, format_string, sz)                      \
 447         fc_rport_show_function(field, format_string, sz, )              \
 448         fc_rport_store_function(field)                                  \
 449 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 450                         show_fc_rport_##field,                          \
 451                         store_fc_rport_##field)
 452
 453
 454 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 455 static ssize_t                                                          \
 456 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 457 {                                                                       \
 458         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 459         return snprintf(buf, sz, format_string, cast rport->field);     \
 460 }
 461
 462 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 463         fc_private_rport_show_function(field, format_string, sz, )      \
 464 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 465                          show_fc_rport_##field, NULL)
 466
 467 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 468         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 469 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 470                           show_fc_rport_##field, NULL)
 471
 472
 473 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 474 static ssize_t                                                          \
 475 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 476 {                                                                       \
 477         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 478         const char *name;                                               \
 479         name = get_fc_##title##_name(rport->title);                     \
 480         if (!name)                                                      \
 481                 return -EINVAL;                                         \
 482         return snprintf(buf, maxlen, "%s\n", name);                     \
 483 }                                                                       \
 484 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 485                         show_fc_rport_##title, NULL)
 486
 487
 488 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 489         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 490         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 491         i->private_rport_attrs[count].store = NULL;                     \
 492         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 493         if (i->f->show_rport_##field)                                   \
 494                 count++
 495
 496 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 497         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 498         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 499         i->private_rport_attrs[count].store = NULL;                     \
 500         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 501         count++
 502
 503 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 504         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 505         if (!i->f->set_rport_##field) {                                 \
 506                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 507                 i->private_rport_attrs[count].store = NULL;             \
 508         }                                                               \
 509         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 510         if (i->f->show_rport_##field)                                   \
 511                 count++
 512
 513
 514 /* The FC Transport Remote Port Attributes: */
 515
 516 /* Fixed Remote Port Attributes */
 517
 518 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 519
 520 static ssize_t
 521 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 522 {
 523         struct fc_rport *rport = transport_class_to_rport(cdev);
 524         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 525                 return snprintf(buf, 20, "unspecified\n");
 526         return get_fc_cos_names(rport->supported_classes, buf);
 527 }
 528 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 529                 show_fc_rport_supported_classes, NULL);
 530
 531 /* Dynamic Remote Port Attributes */
 532
 533 /*
 534  * dev_loss_tmo attribute
 535  */
 536 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 537 static ssize_t
 538 store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
 539                            size_t count)
 540 {
 541         int val;
 542         struct fc_rport *rport = transport_class_to_rport(cdev);
 543         struct Scsi_Host *shost = rport_to_shost(rport);
 544         struct fc_internal *i = to_fc_internal(shost->transportt);
 545         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 546             (rport->port_state == FC_PORTSTATE_DELETED) ||
 547             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 548                 return -EBUSY;
 549         val = simple_strtoul(buf, NULL, 0);
 550         if ((val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 551                 return -EINVAL;
 552         i->f->set_rport_dev_loss_tmo(rport, val);
 553         return count;
 554 }
 555 static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 556                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 557
 558
 559 /* Private Remote Port Attributes */
 560
 561 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 562 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 563 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 564
 565 static ssize_t
 566 show_fc_rport_roles (struct class_device *cdev, char *buf)
 567 {
 568         struct fc_rport *rport = transport_class_to_rport(cdev);
 569
 570         /* identify any roles that are port_id specific */
 571         if ((rport->port_id != -1) &&
 572             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 573                                         FC_WELLKNOWN_PORTID_MASK) {
 574                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 575                 case FC_FPORT_PORTID:
 576                         return snprintf(buf, 30, "Fabric Port\n");
 577                 case FC_FABCTLR_PORTID:
 578                         return snprintf(buf, 30, "Fabric Controller\n");
 579                 case FC_DIRSRVR_PORTID:
 580                         return snprintf(buf, 30, "Directory Server\n");
 581                 case FC_TIMESRVR_PORTID:
 582                         return snprintf(buf, 30, "Time Server\n");
 583                 case FC_MGMTSRVR_PORTID:
 584                         return snprintf(buf, 30, "Management Server\n");
 585                 default:
 586                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 587                 }
 588         } else {
 589                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 590                         return snprintf(buf, 20, "unknown\n");
 591                 return get_fc_remote_port_roles_names(rport->roles, buf);
 592         }
 593 }
 594 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 595                 show_fc_rport_roles, NULL);
 596
 597 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 598 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 599
 600
 601
 602 /*
 603  * FC SCSI Target Attribute Management
 604  */
 605
 606 /*
 607  * Note: in the target show function we recognize when the remote
 608  *  port is in the heirarchy and do not allow the driver to get
 609  *  involved in sysfs functions. The driver only gets involved if
 610  *  it's the "old" style that doesn't use rports.
 611  */
 612 #define fc_starget_show_function(field, format_string, sz, cast)        \
 613 static ssize_t                                                          \
 614 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 615 {                                                                       \
 616         struct scsi_target *starget = transport_class_to_starget(cdev); \
 617         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 618         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 619         struct fc_rport *rport = starget_to_rport(starget);             \
 620         if (rport)                                                      \
 621                 fc_starget_##field(starget) = rport->field;             \
 622         else if (i->f->get_starget_##field)                             \
 623                 i->f->get_starget_##field(starget);                     \
 624         return snprintf(buf, sz, format_string,                         \
 625                 cast fc_starget_##field(starget));                      \
 626 }
 627
 628 #define fc_starget_rd_attr(field, format_string, sz)                    \
 629         fc_starget_show_function(field, format_string, sz, )            \
 630 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 631                          show_fc_starget_##field, NULL)
 632
 633 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 634         fc_starget_show_function(field, format_string, sz, (cast))      \
 635 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 636                           show_fc_starget_##field, NULL)
 637
 638 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 639         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 640         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 641         i->private_starget_attrs[count].store = NULL;                   \
 642         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 643         if (i->f->show_starget_##field)                                 \
 644                 count++
 645
 646 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 647         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 648         if (!i->f->set_starget_##field) {                               \
 649                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 650                 i->private_starget_attrs[count].store = NULL;           \
 651         }                                                               \
 652         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 653         if (i->f->show_starget_##field)                                 \
 654                 count++
 655
 656 /* The FC Transport SCSI Target Attributes: */
 657 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 658 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 659 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 660
 661
 662 /*
 663  * Host Attribute Management
 664  */
 665
 666 #define fc_host_show_function(field, format_string, sz, cast)           \
 667 static ssize_t                                                          \
 668 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 669 {                                                                       \
 670         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 671         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 672         if (i->f->get_host_##field)                                     \
 673                 i->f->get_host_##field(shost);                          \
 674         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 675 }
 676
 677 #define fc_host_store_function(field)                                   \
 678 static ssize_t                                                          \
 679 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 680                            size_t count)                                \
 681 {                                                                       \
 682         int val;                                                        \
 683         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 684         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 685                                                                         \
 686         val = simple_strtoul(buf, NULL, 0);                             \
 687         i->f->set_host_##field(shost, val);                             \
 688         return count;                                                   \
 689 }
 690
 691 #define fc_host_rd_attr(field, format_string, sz)                       \
 692         fc_host_show_function(field, format_string, sz, )               \
 693 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 694                          show_fc_host_##field, NULL)
 695
 696 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 697         fc_host_show_function(field, format_string, sz, (cast))         \
 698 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 699                           show_fc_host_##field, NULL)
 700
 701 #define fc_host_rw_attr(field, format_string, sz)                       \
 702         fc_host_show_function(field, format_string, sz, )               \
 703         fc_host_store_function(field)                                   \
 704 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 705                         show_fc_host_##field,                           \
 706                         store_fc_host_##field)
 707
 708 #define fc_host_rd_enum_attr(title, maxlen)                             \
 709 static ssize_t                                                          \
 710 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 711 {                                                                       \
 712         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 713         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 714         const char *name;                                               \
 715         if (i->f->get_host_##title)                                     \
 716                 i->f->get_host_##title(shost);                          \
 717         name = get_fc_##title##_name(fc_host_##title(shost));           \
 718         if (!name)                                                      \
 719                 return -EINVAL;                                         \
 720         return snprintf(buf, maxlen, "%s\n", name);                     \
 721 }                                                                       \
 722 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 723
 724 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 725         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 726         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 727         i->private_host_attrs[count].store = NULL;                      \
 728         i->host_attrs[count] = &i->private_host_attrs[count];           \
 729         if (i->f->show_host_##field)                                    \
 730                 count++
 731
 732 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
 733         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 734         if (!i->f->set_host_##field) {                                  \
 735                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
 736                 i->private_host_attrs[count].store = NULL;              \
 737         }                                                               \
 738         i->host_attrs[count] = &i->private_host_attrs[count];           \
 739         if (i->f->show_host_##field)                                    \
 740                 count++
 741
 742
 743 #define fc_private_host_show_function(field, format_string, sz, cast)   \
 744 static ssize_t                                                          \
 745 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 746 {                                                                       \
 747         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 748         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 749 }
 750
 751 #define fc_private_host_rd_attr(field, format_string, sz)               \
 752         fc_private_host_show_function(field, format_string, sz, )       \
 753 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 754                          show_fc_host_##field, NULL)
 755
 756 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
 757         fc_private_host_show_function(field, format_string, sz, (cast)) \
 758 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 759                           show_fc_host_##field, NULL)
 760
 761 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
 762         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 763         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 764         i->private_host_attrs[count].store = NULL;                      \
 765         i->host_attrs[count] = &i->private_host_attrs[count];           \
 766         count++
 767
 768 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
 769 {                                                                       \
 770         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 771         i->host_attrs[count] = &i->private_host_attrs[count];           \
 772         count++;                                                        \
 773 }
 774
 775
 776 /* Fixed Host Attributes */
 777
 778 static ssize_t
 779 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
 780 {
 781         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 782
 783         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
 784                 return snprintf(buf, 20, "unspecified\n");
 785
 786         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
 787 }
 788 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
 789                 show_fc_host_supported_classes, NULL);
 790
 791 static ssize_t
 792 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
 793 {
 794         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 795         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
 796 }
 797 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
 798                 show_fc_host_supported_fc4s, NULL);
 799
 800 static ssize_t
 801 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
 802 {
 803         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 804
 805         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
 806                 return snprintf(buf, 20, "unknown\n");
 807
 808         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
 809 }
 810 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 811                 show_fc_host_supported_speeds, NULL);
 812
 813
 814 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 815 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 816 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
 817                              unsigned long long);
 818 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
 819 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 820 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
 821
 822
 823 /* Dynamic Host Attributes */
 824
 825 static ssize_t
 826 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
 827 {
 828         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 829         struct fc_internal *i = to_fc_internal(shost->transportt);
 830
 831         if (i->f->get_host_active_fc4s)
 832                 i->f->get_host_active_fc4s(shost);
 833
 834         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
 835 }
 836 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
 837                 show_fc_host_active_fc4s, NULL);
 838
 839 static ssize_t
 840 show_fc_host_speed (struct class_device *cdev, char *buf)
 841 {
 842         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 843         struct fc_internal *i = to_fc_internal(shost->transportt);
 844
 845         if (i->f->get_host_speed)
 846                 i->f->get_host_speed(shost);
 847
 848         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
 849                 return snprintf(buf, 20, "unknown\n");
 850
 851         return get_fc_port_speed_names(fc_host_speed(shost), buf);
 852 }
 853 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
 854                 show_fc_host_speed, NULL);
 855
 856
 857 fc_host_rd_attr(port_id, "0x%06x\n", 20);
 858 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
 859 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 860 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 861
 862
 863 /* Private Host Attributes */
 864
 865 static ssize_t
 866 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
 867 {
 868         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 869         const char *name;
 870
 871         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
 872         if (!name)
 873                 return -EINVAL;
 874         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 875 }
 876
 877 #define get_list_head_entry(pos, head, member)          \
 878         pos = list_entry((head)->next, typeof(*pos), member)
 879
 880 static ssize_t
 881 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
 882         const char *buf, size_t count)
 883 {
 884         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 885         struct fc_rport *rport;
 886         enum fc_tgtid_binding_type val;
 887         unsigned long flags;
 888
 889         if (get_fc_tgtid_bind_type_match(buf, &val))
 890                 return -EINVAL;
 891
 892         /* if changing bind type, purge all unused consistent bindings */
 893         if (val != fc_host_tgtid_bind_type(shost)) {
 894                 spin_lock_irqsave(shost->host_lock, flags);
 895                 while (!list_empty(&fc_host_rport_bindings(shost))) {
 896                         get_list_head_entry(rport,
 897                                 &fc_host_rport_bindings(shost), peers);
 898                         list_del(&rport->peers);
 899                         rport->port_state = FC_PORTSTATE_DELETED;
 900                         fc_queue_work(shost, &rport->rport_delete_work);
 901                 }
 902                 spin_unlock_irqrestore(shost->host_lock, flags);
 903         }
 904
 905         fc_host_tgtid_bind_type(shost) = val;
 906         return count;
 907 }
 908
 909 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
 910                         show_fc_private_host_tgtid_bind_type,
 911                         store_fc_private_host_tgtid_bind_type);
 912
 913 static ssize_t
 914 store_fc_private_host_issue_lip(struct class_device *cdev,
 915         const char *buf, size_t count)
 916 {
 917         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 918         struct fc_internal *i = to_fc_internal(shost->transportt);
 919         int ret;
 920
 921         /* ignore any data value written to the attribute */
 922         if (i->f->issue_fc_host_lip) {
 923                 ret = i->f->issue_fc_host_lip(shost);
 924                 return ret ? ret: count;
 925         }
 926
 927         return -ENOENT;
 928 }
 929
 930 static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
 931                         store_fc_private_host_issue_lip);
 932
 933 /*
 934  * Host Statistics Management
 935  */
 936
 937 /* Show a given an attribute in the statistics group */
 938 static ssize_t
 939 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
 940 {
 941         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 942         struct fc_internal *i = to_fc_internal(shost->transportt);
 943         struct fc_host_statistics *stats;
 944         ssize_t ret = -ENOENT;
 945
 946         if (offset > sizeof(struct fc_host_statistics) ||
 947             offset % sizeof(u64) != 0)
 948                 WARN_ON(1);
 949
 950         if (i->f->get_fc_host_stats) {
 951                 stats = (i->f->get_fc_host_stats)(shost);
 952                 if (stats)
 953                         ret = snprintf(buf, 20, "0x%llx\n",
 954                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
 955         }
 956         return ret;
 957 }
 958
 959
 960 /* generate a read-only statistics attribute */
 961 #define fc_host_statistic(name)                                         \
 962 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
 963 {                                                                       \
 964         return fc_stat_show(cd, buf,                                    \
 965                             offsetof(struct fc_host_statistics, name)); \
 966 }                                                                       \
 967 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
 968
 969 fc_host_statistic(seconds_since_last_reset);
 970 fc_host_statistic(tx_frames);
 971 fc_host_statistic(tx_words);
 972 fc_host_statistic(rx_frames);
 973 fc_host_statistic(rx_words);
 974 fc_host_statistic(lip_count);
 975 fc_host_statistic(nos_count);
 976 fc_host_statistic(error_frames);
 977 fc_host_statistic(dumped_frames);
 978 fc_host_statistic(link_failure_count);
 979 fc_host_statistic(loss_of_sync_count);
 980 fc_host_statistic(loss_of_signal_count);
 981 fc_host_statistic(prim_seq_protocol_err_count);
 982 fc_host_statistic(invalid_tx_word_count);
 983 fc_host_statistic(invalid_crc_count);
 984 fc_host_statistic(fcp_input_requests);
 985 fc_host_statistic(fcp_output_requests);
 986 fc_host_statistic(fcp_control_requests);
 987 fc_host_statistic(fcp_input_megabytes);
 988 fc_host_statistic(fcp_output_megabytes);
 989
 990 static ssize_t
 991 fc_reset_statistics(struct class_device *cdev, const char *buf,
 992                            size_t count)
 993 {
 994         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 995         struct fc_internal *i = to_fc_internal(shost->transportt);
 996
 997         /* ignore any data value written to the attribute */
 998         if (i->f->reset_fc_host_stats) {
 999                 i->f->reset_fc_host_stats(shost);
1000                 return count;
1001         }
1002
1003         return -ENOENT;
1004 }
1005 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1006                                 fc_reset_statistics);
1007
1008
1009 static struct attribute *fc_statistics_attrs[] = {
1010         &class_device_attr_host_seconds_since_last_reset.attr,
1011         &class_device_attr_host_tx_frames.attr,
1012         &class_device_attr_host_tx_words.attr,
1013         &class_device_attr_host_rx_frames.attr,
1014         &class_device_attr_host_rx_words.attr,
1015         &class_device_attr_host_lip_count.attr,
1016         &class_device_attr_host_nos_count.attr,
1017         &class_device_attr_host_error_frames.attr,
1018         &class_device_attr_host_dumped_frames.attr,
1019         &class_device_attr_host_link_failure_count.attr,
1020         &class_device_attr_host_loss_of_sync_count.attr,
1021         &class_device_attr_host_loss_of_signal_count.attr,
1022         &class_device_attr_host_prim_seq_protocol_err_count.attr,
1023         &class_device_attr_host_invalid_tx_word_count.attr,
1024         &class_device_attr_host_invalid_crc_count.attr,
1025         &class_device_attr_host_fcp_input_requests.attr,
1026         &class_device_attr_host_fcp_output_requests.attr,
1027         &class_device_attr_host_fcp_control_requests.attr,
1028         &class_device_attr_host_fcp_input_megabytes.attr,
1029         &class_device_attr_host_fcp_output_megabytes.attr,
1030         &class_device_attr_host_reset_statistics.attr,
1031         NULL
1032 };
1033
1034 static struct attribute_group fc_statistics_group = {
1035         .name = "statistics",
1036         .attrs = fc_statistics_attrs,
1037 };
1038
1039 static int fc_host_match(struct attribute_container *cont,
1040                           struct device *dev)
1041 {
1042         struct Scsi_Host *shost;
1043         struct fc_internal *i;
1044
1045         if (!scsi_is_host_device(dev))
1046                 return 0;
1047
1048         shost = dev_to_shost(dev);
1049         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1050             != &fc_host_class.class)
1051                 return 0;
1052
1053         i = to_fc_internal(shost->transportt);
1054
1055         return &i->t.host_attrs.ac == cont;
1056 }
1057
1058 static int fc_target_match(struct attribute_container *cont,
1059                             struct device *dev)
1060 {
1061         struct Scsi_Host *shost;
1062         struct fc_internal *i;
1063
1064         if (!scsi_is_target_device(dev))
1065                 return 0;
1066
1067         shost = dev_to_shost(dev->parent);
1068         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1069             != &fc_host_class.class)
1070                 return 0;
1071
1072         i = to_fc_internal(shost->transportt);
1073
1074         return &i->t.target_attrs.ac == cont;
1075 }
1076
1077 static void fc_rport_dev_release(struct device *dev)
1078 {
1079         struct fc_rport *rport = dev_to_rport(dev);
1080         put_device(dev->parent);
1081         kfree(rport);
1082 }
1083
1084 int scsi_is_fc_rport(const struct device *dev)
1085 {
1086         return dev->release == fc_rport_dev_release;
1087 }
1088 EXPORT_SYMBOL(scsi_is_fc_rport);
1089
1090 static int fc_rport_match(struct attribute_container *cont,
1091                             struct device *dev)
1092 {
1093         struct Scsi_Host *shost;
1094         struct fc_internal *i;
1095
1096         if (!scsi_is_fc_rport(dev))
1097                 return 0;
1098
1099         shost = dev_to_shost(dev->parent);
1100         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1101             != &fc_host_class.class)
1102                 return 0;
1103
1104         i = to_fc_internal(shost->transportt);
1105
1106         return &i->rport_attr_cont.ac == cont;
1107 }
1108
1109
1110 /**
1111  * fc_timed_out - FC Transport I/O timeout intercept handler
1112  *
1113  * @scmd:       The SCSI command which timed out
1114  *
1115  * This routine protects against error handlers getting invoked while a
1116  * rport is in a blocked state, typically due to a temporarily loss of
1117  * connectivity. If the error handlers are allowed to proceed, requests
1118  * to abort i/o, reset the target, etc will likely fail as there is no way
1119  * to communicate with the device to perform the requested function. These
1120  * failures may result in the midlayer taking the device offline, requiring
1121  * manual intervention to restore operation.
1122  *
1123  * This routine, called whenever an i/o times out, validates the state of
1124  * the underlying rport. If the rport is blocked, it returns
1125  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1126  * Eventually, either the device will return, or devloss_tmo will fire,
1127  * and when the timeout then fires, it will be handled normally.
1128  * If the rport is not blocked, normal error handling continues.
1129  *
1130  * Notes:
1131  *      This routine assumes no locks are held on entry.
1132  **/
1133 static enum scsi_eh_timer_return
1134 fc_timed_out(struct scsi_cmnd *scmd)
1135 {
1136         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1137
1138         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1139                 return EH_RESET_TIMER;
1140
1141         return EH_NOT_HANDLED;
1142 }
1143
1144 /*
1145  * Must be called with shost->host_lock held
1146  */
1147 static int fc_user_scan(struct Scsi_Host *shost, uint channel,
1148                 uint id, uint lun)
1149 {
1150         struct fc_rport *rport;
1151
1152         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1153                 if (rport->scsi_target_id == -1)
1154                         continue;
1155
1156                 if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
1157                     (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
1158                         scsi_scan_target(&rport->dev, rport->channel,
1159                                          rport->scsi_target_id, lun, 1);
1160                 }
1161         }
1162
1163         return 0;
1164 }
1165
1166 struct scsi_transport_template *
1167 fc_attach_transport(struct fc_function_template *ft)
1168 {
1169         int count;
1170         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
1171                                         GFP_KERNEL);
1172
1173         if (unlikely(!i))
1174                 return NULL;
1175
1176         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1177         i->t.target_attrs.ac.class = &fc_transport_class.class;
1178         i->t.target_attrs.ac.match = fc_target_match;
1179         i->t.target_size = sizeof(struct fc_starget_attrs);
1180         transport_container_register(&i->t.target_attrs);
1181
1182         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1183         i->t.host_attrs.ac.class = &fc_host_class.class;
1184         i->t.host_attrs.ac.match = fc_host_match;
1185         i->t.host_size = sizeof(struct fc_host_attrs);
1186         if (ft->get_fc_host_stats)
1187                 i->t.host_attrs.statistics = &fc_statistics_group;
1188         transport_container_register(&i->t.host_attrs);
1189
1190         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1191         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1192         i->rport_attr_cont.ac.match = fc_rport_match;
1193         transport_container_register(&i->rport_attr_cont);
1194
1195         i->f = ft;
1196
1197         /* Transport uses the shost workq for scsi scanning */
1198         i->t.create_work_queue = 1;
1199
1200         i->t.eh_timed_out = fc_timed_out;
1201
1202         i->t.user_scan = fc_user_scan;
1203
1204         /*
1205          * Setup SCSI Target Attributes.
1206          */
1207         count = 0;
1208         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1209         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1210         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1211
1212         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1213
1214         i->starget_attrs[count] = NULL;
1215
1216
1217         /*
1218          * Setup SCSI Host Attributes.
1219          */
1220         count=0;
1221         SETUP_HOST_ATTRIBUTE_RD(node_name);
1222         SETUP_HOST_ATTRIBUTE_RD(port_name);
1223         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
1224         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1225         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1226         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1227         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1228         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1229         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1230
1231         SETUP_HOST_ATTRIBUTE_RD(port_id);
1232         SETUP_HOST_ATTRIBUTE_RD(port_type);
1233         SETUP_HOST_ATTRIBUTE_RD(port_state);
1234         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1235         SETUP_HOST_ATTRIBUTE_RD(speed);
1236         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1237
1238         /* Transport-managed attributes */
1239         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1240         if (ft->issue_fc_host_lip)
1241                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
1242
1243         BUG_ON(count > FC_HOST_NUM_ATTRS);
1244
1245         i->host_attrs[count] = NULL;
1246
1247         /*
1248          * Setup Remote Port Attributes.
1249          */
1250         count=0;
1251         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1252         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1253         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1254         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1255         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1256         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1257         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1258         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1259         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1260
1261         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1262
1263         i->rport_attrs[count] = NULL;
1264
1265         return &i->t;
1266 }
1267 EXPORT_SYMBOL(fc_attach_transport);
1268
1269 void fc_release_transport(struct scsi_transport_template *t)
1270 {
1271         struct fc_internal *i = to_fc_internal(t);
1272
1273         transport_container_unregister(&i->t.target_attrs);
1274         transport_container_unregister(&i->t.host_attrs);
1275         transport_container_unregister(&i->rport_attr_cont);
1276
1277         kfree(i);
1278 }
1279 EXPORT_SYMBOL(fc_release_transport);
1280
1281 /**
1282  * fc_queue_work - Queue work to the fc_host workqueue.
1283  * @shost:      Pointer to Scsi_Host bound to fc_host.
1284  * @work:       Work to queue for execution.
1285  *
1286  * Return value:
1287  *      1 - work queued for execution
1288  *      0 - work is already queued
1289  *      -EINVAL - work queue doesn't exist
1290  **/
1291 static int
1292 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
1293 {
1294         if (unlikely(!fc_host_work_q(shost))) {
1295                 printk(KERN_ERR
1296                         "ERROR: FC host '%s' attempted to queue work, "
1297                         "when no workqueue created.\n", shost->hostt->name);
1298                 dump_stack();
1299
1300                 return -EINVAL;
1301         }
1302
1303         return queue_work(fc_host_work_q(shost), work);
1304 }
1305
1306 /**
1307  * fc_flush_work - Flush a fc_host's workqueue.
1308  * @shost:      Pointer to Scsi_Host bound to fc_host.
1309  **/
1310 static void
1311 fc_flush_work(struct Scsi_Host *shost)
1312 {
1313         if (!fc_host_work_q(shost)) {
1314                 printk(KERN_ERR
1315                         "ERROR: FC host '%s' attempted to flush work, "
1316                         "when no workqueue created.\n", shost->hostt->name);
1317                 dump_stack();
1318                 return;
1319         }
1320
1321         flush_workqueue(fc_host_work_q(shost));
1322 }
1323
1324 /**
1325  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
1326  * @shost:      Pointer to Scsi_Host bound to fc_host.
1327  * @work:       Work to queue for execution.
1328  * @delay:      jiffies to delay the work queuing
1329  *
1330  * Return value:
1331  *      0 on success / != 0 for error
1332  **/
1333 static int
1334 fc_queue_devloss_work(struct Scsi_Host *shost, struct work_struct *work,
1335                                 unsigned long delay)
1336 {
1337         if (unlikely(!fc_host_devloss_work_q(shost))) {
1338                 printk(KERN_ERR
1339                         "ERROR: FC host '%s' attempted to queue work, "
1340                         "when no workqueue created.\n", shost->hostt->name);
1341                 dump_stack();
1342
1343                 return -EINVAL;
1344         }
1345
1346         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
1347 }
1348
1349 /**
1350  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
1351  * @shost:      Pointer to Scsi_Host bound to fc_host.
1352  **/
1353 static void
1354 fc_flush_devloss(struct Scsi_Host *shost)
1355 {
1356         if (!fc_host_devloss_work_q(shost)) {
1357                 printk(KERN_ERR
1358                         "ERROR: FC host '%s' attempted to flush work, "
1359                         "when no workqueue created.\n", shost->hostt->name);
1360                 dump_stack();
1361                 return;
1362         }
1363
1364         flush_workqueue(fc_host_devloss_work_q(shost));
1365 }
1366
1367
1368 /**
1369  * fc_remove_host - called to terminate any fc_transport-related elements
1370  *                  for a scsi host.
1371  * @rport:      remote port to be unblocked.
1372  *
1373  * This routine is expected to be called immediately preceeding the
1374  * a driver's call to scsi_remove_host().
1375  *
1376  * WARNING: A driver utilizing the fc_transport, which fails to call
1377  *   this routine prior to scsi_remote_host(), will leave dangling
1378  *   objects in /sys/class/fc_remote_ports. Access to any of these
1379  *   objects can result in a system crash !!!
1380  *
1381  * Notes:
1382  *      This routine assumes no locks are held on entry.
1383  **/
1384 void
1385 fc_remove_host(struct Scsi_Host *shost)
1386 {
1387         struct fc_rport *rport, *next_rport;
1388         struct workqueue_struct *work_q;
1389         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1390
1391         /* Remove any remote ports */
1392         list_for_each_entry_safe(rport, next_rport,
1393                         &fc_host->rports, peers) {
1394                 list_del(&rport->peers);
1395                 rport->port_state = FC_PORTSTATE_DELETED;
1396                 fc_queue_work(shost, &rport->rport_delete_work);
1397         }
1398
1399         list_for_each_entry_safe(rport, next_rport,
1400                         &fc_host->rport_bindings, peers) {
1401                 list_del(&rport->peers);
1402                 rport->port_state = FC_PORTSTATE_DELETED;
1403                 fc_queue_work(shost, &rport->rport_delete_work);
1404         }
1405
1406         /* flush all scan work items */
1407         scsi_flush_work(shost);
1408
1409         /* flush all stgt delete, and rport delete work items, then kill it  */
1410         if (fc_host->work_q) {
1411                 work_q = fc_host->work_q;
1412                 fc_host->work_q = NULL;
1413                 destroy_workqueue(work_q);
1414         }
1415
1416         /* flush all devloss work items, then kill it  */
1417         if (fc_host->devloss_work_q) {
1418                 work_q = fc_host->devloss_work_q;
1419                 fc_host->devloss_work_q = NULL;
1420                 destroy_workqueue(work_q);
1421         }
1422 }
1423 EXPORT_SYMBOL(fc_remove_host);
1424
1425
1426 /**
1427  * fc_starget_delete - called to delete the scsi decendents of an rport
1428  *                  (target and all sdevs)
1429  *
1430  * @data:       remote port to be operated on.
1431  **/
1432 static void
1433 fc_starget_delete(void *data)
1434 {
1435         struct fc_rport *rport = (struct fc_rport *)data;
1436         struct Scsi_Host *shost = rport_to_shost(rport);
1437         unsigned long flags;
1438
1439         spin_lock_irqsave(shost->host_lock, flags);
1440         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
1441                 spin_unlock_irqrestore(shost->host_lock, flags);
1442                 if (!cancel_delayed_work(&rport->dev_loss_work))
1443                         fc_flush_devloss(shost);
1444                 spin_lock_irqsave(shost->host_lock, flags);
1445                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1446         }
1447         spin_unlock_irqrestore(shost->host_lock, flags);
1448
1449         scsi_remove_target(&rport->dev);
1450 }
1451
1452
1453 /**
1454  * fc_rport_final_delete - finish rport termination and delete it.
1455  *
1456  * @data:       remote port to be deleted.
1457  **/
1458 static void
1459 fc_rport_final_delete(void *data)
1460 {
1461         struct fc_rport *rport = (struct fc_rport *)data;
1462         struct device *dev = &rport->dev;
1463         struct Scsi_Host *shost = rport_to_shost(rport);
1464
1465         /* Delete SCSI target and sdevs */
1466         if (rport->scsi_target_id != -1)
1467                 fc_starget_delete(data);
1468
1469         /*
1470          * if a scan is pending, flush the SCSI Host work_q so that
1471          * that we can reclaim the rport scan work element.
1472          */
1473         if (rport->flags & FC_RPORT_SCAN_PENDING)
1474                 scsi_flush_work(shost);
1475
1476         transport_remove_device(dev);
1477         device_del(dev);
1478         transport_destroy_device(dev);
1479         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1480         put_device(dev);                        /* for self-reference */
1481 }
1482
1483
1484 /**
1485  * fc_rport_create - allocates and creates a remote FC port.
1486  * @shost:      scsi host the remote port is connected to.
1487  * @channel:    Channel on shost port connected to.
1488  * @ids:        The world wide names, fc address, and FC4 port
1489  *              roles for the remote port.
1490  *
1491  * Allocates and creates the remoter port structure, including the
1492  * class and sysfs creation.
1493  *
1494  * Notes:
1495  *      This routine assumes no locks are held on entry.
1496  **/
1497 struct fc_rport *
1498 fc_rport_create(struct Scsi_Host *shost, int channel,
1499         struct fc_rport_identifiers  *ids)
1500 {
1501         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1502         struct fc_internal *fci = to_fc_internal(shost->transportt);
1503         struct fc_rport *rport;
1504         struct device *dev;
1505         unsigned long flags;
1506         int error;
1507         size_t size;
1508
1509         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1510         rport = kzalloc(size, GFP_KERNEL);
1511         if (unlikely(!rport)) {
1512                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1513                 return NULL;
1514         }
1515
1516         rport->maxframe_size = -1;
1517         rport->supported_classes = FC_COS_UNSPECIFIED;
1518         rport->dev_loss_tmo = fc_dev_loss_tmo;
1519         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1520         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1521         rport->port_id = ids->port_id;
1522         rport->roles = ids->roles;
1523         rport->port_state = FC_PORTSTATE_ONLINE;
1524         if (fci->f->dd_fcrport_size)
1525                 rport->dd_data = &rport[1];
1526         rport->channel = channel;
1527
1528         INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport);
1529         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1530         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete, rport);
1531         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete, rport);
1532
1533         spin_lock_irqsave(shost->host_lock, flags);
1534
1535         rport->number = fc_host->next_rport_number++;
1536         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1537                 rport->scsi_target_id = fc_host->next_target_id++;
1538         else
1539                 rport->scsi_target_id = -1;
1540         list_add_tail(&rport->peers, &fc_host->rports);
1541         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
1542
1543         spin_unlock_irqrestore(shost->host_lock, flags);
1544
1545         dev = &rport->dev;
1546         device_initialize(dev);                 /* takes self reference */
1547         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
1548         dev->release = fc_rport_dev_release;
1549         sprintf(dev->bus_id, "rport-%d:%d-%d",
1550                 shost->host_no, channel, rport->number);
1551         transport_setup_device(dev);
1552
1553         error = device_add(dev);
1554         if (error) {
1555                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1556                 goto delete_rport;
1557         }
1558         transport_add_device(dev);
1559         transport_configure_device(dev);
1560
1561         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
1562                 /* initiate a scan of the target */
1563                 rport->flags |= FC_RPORT_SCAN_PENDING;
1564                 scsi_queue_work(shost, &rport->scan_work);
1565         }
1566
1567         return rport;
1568
1569 delete_rport:
1570         transport_destroy_device(dev);
1571         spin_lock_irqsave(shost->host_lock, flags);
1572         list_del(&rport->peers);
1573         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1574         spin_unlock_irqrestore(shost->host_lock, flags);
1575         put_device(dev->parent);
1576         kfree(rport);
1577         return NULL;
1578 }
1579
1580 /**
1581  * fc_remote_port_add - notifies the fc transport of the existence
1582  *              of a remote FC port.
1583  * @shost:      scsi host the remote port is connected to.
1584  * @channel:    Channel on shost port connected to.
1585  * @ids:        The world wide names, fc address, and FC4 port
1586  *              roles for the remote port.
1587  *
1588  * The LLDD calls this routine to notify the transport of the existence
1589  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1590  * of the port, it's FC address (port_id), and the FC4 roles that are
1591  * active for the port.
1592  *
1593  * For ports that are FCP targets (aka scsi targets), the FC transport
1594  * maintains consistent target id bindings on behalf of the LLDD.
1595  * A consistent target id binding is an assignment of a target id to
1596  * a remote port identifier, which persists while the scsi host is
1597  * attached. The remote port can disappear, then later reappear, and
1598  * it's target id assignment remains the same. This allows for shifts
1599  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1600  * changes to the scsi subsystem which is based on scsi host number and
1601  * target id values.  Bindings are only valid during the attachment of
1602  * the scsi host. If the host detaches, then later re-attaches, target
1603  * id bindings may change.
1604  *
1605  * This routine is responsible for returning a remote port structure.
1606  * The routine will search the list of remote ports it maintains
1607  * internally on behalf of consistent target id mappings. If found, the
1608  * remote port structure will be reused. Otherwise, a new remote port
1609  * structure will be allocated.
1610  *
1611  * Whenever a remote port is allocated, a new fc_remote_port class
1612  * device is created.
1613  *
1614  * Should not be called from interrupt context.
1615  *
1616  * Notes:
1617  *      This routine assumes no locks are held on entry.
1618  **/
1619 struct fc_rport *
1620 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1621         struct fc_rport_identifiers  *ids)
1622 {
1623         struct fc_internal *fci = to_fc_internal(shost->transportt);
1624         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1625         struct fc_rport *rport;
1626         unsigned long flags;
1627         int match = 0;
1628
1629         /* ensure any stgt delete functions are done */
1630         fc_flush_work(shost);
1631
1632         /*
1633          * Search the list of "active" rports, for an rport that has been
1634          * deleted, but we've held off the real delete while the target
1635          * is in a "blocked" state.
1636          */
1637         spin_lock_irqsave(shost->host_lock, flags);
1638
1639         list_for_each_entry(rport, &fc_host->rports, peers) {
1640
1641                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
1642                         (rport->channel == channel)) {
1643
1644                         switch (fc_host->tgtid_bind_type) {
1645                         case FC_TGTID_BIND_BY_WWPN:
1646                         case FC_TGTID_BIND_NONE:
1647                                 if (rport->port_name == ids->port_name)
1648                                         match = 1;
1649                                 break;
1650                         case FC_TGTID_BIND_BY_WWNN:
1651                                 if (rport->node_name == ids->node_name)
1652                                         match = 1;
1653                                 break;
1654                         case FC_TGTID_BIND_BY_ID:
1655                                 if (rport->port_id == ids->port_id)
1656                                         match = 1;
1657                                 break;
1658                         }
1659
1660                         if (match) {
1661                                 struct work_struct *work =
1662                                                         &rport->dev_loss_work;
1663
1664                                 memcpy(&rport->node_name, &ids->node_name,
1665                                         sizeof(rport->node_name));
1666                                 memcpy(&rport->port_name, &ids->port_name,
1667                                         sizeof(rport->port_name));
1668                                 rport->port_id = ids->port_id;
1669
1670                                 rport->port_state = FC_PORTSTATE_ONLINE;
1671                                 rport->roles = ids->roles;
1672
1673                                 spin_unlock_irqrestore(shost->host_lock, flags);
1674
1675                                 if (fci->f->dd_fcrport_size)
1676                                         memset(rport->dd_data, 0,
1677                                                 fci->f->dd_fcrport_size);
1678
1679                                 /*
1680                                  * If we were blocked, we were a target.
1681                                  * If no longer a target, we leave the timer
1682                                  * running in case the port changes roles
1683                                  * prior to the timer expiring. If the timer
1684                                  * fires, the target will be torn down.
1685                                  */
1686                                 if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
1687                                         return rport;
1688
1689                                 /* restart the target */
1690
1691                                 /*
1692                                  * Stop the target timer first. Take no action
1693                                  * on the del_timer failure as the state
1694                                  * machine state change will validate the
1695                                  * transaction.
1696                                  */
1697                                 if (!cancel_delayed_work(work))
1698                                         fc_flush_devloss(shost);
1699
1700                                 spin_lock_irqsave(shost->host_lock, flags);
1701
1702                                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1703
1704                                 /* initiate a scan of the target */
1705                                 rport->flags |= FC_RPORT_SCAN_PENDING;
1706                                 scsi_queue_work(shost, &rport->scan_work);
1707
1708                                 spin_unlock_irqrestore(shost->host_lock, flags);
1709
1710                                 scsi_target_unblock(&rport->dev);
1711
1712                                 return rport;
1713                         }
1714                 }
1715         }
1716
1717         /* Search the bindings array */
1718         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
1719
1720                 /* search for a matching consistent binding */
1721
1722                 list_for_each_entry(rport, &fc_host->rport_bindings,
1723                                         peers) {
1724                         if (rport->channel != channel)
1725                                 continue;
1726
1727                         switch (fc_host->tgtid_bind_type) {
1728                         case FC_TGTID_BIND_BY_WWPN:
1729                                 if (rport->port_name == ids->port_name)
1730                                         match = 1;
1731                                 break;
1732                         case FC_TGTID_BIND_BY_WWNN:
1733                                 if (rport->node_name == ids->node_name)
1734                                         match = 1;
1735                                 break;
1736                         case FC_TGTID_BIND_BY_ID:
1737                                 if (rport->port_id == ids->port_id)
1738                                         match = 1;
1739                                 break;
1740                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1741                                 break;
1742                         }
1743
1744                         if (match) {
1745                                 list_move_tail(&rport->peers, &fc_host->rports);
1746                                 break;
1747                         }
1748                 }
1749
1750                 if (match) {
1751                         memcpy(&rport->node_name, &ids->node_name,
1752                                 sizeof(rport->node_name));
1753                         memcpy(&rport->port_name, &ids->port_name,
1754                                 sizeof(rport->port_name));
1755                         rport->port_id = ids->port_id;
1756                         rport->roles = ids->roles;
1757                         rport->port_state = FC_PORTSTATE_ONLINE;
1758
1759                         if (fci->f->dd_fcrport_size)
1760                                 memset(rport->dd_data, 0,
1761                                                 fci->f->dd_fcrport_size);
1762
1763                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
1764                                 /* initiate a scan of the target */
1765                                 rport->flags |= FC_RPORT_SCAN_PENDING;
1766                                 scsi_queue_work(shost, &rport->scan_work);
1767                                 spin_unlock_irqrestore(shost->host_lock, flags);
1768                                 scsi_target_unblock(&rport->dev);
1769                         } else
1770                                 spin_unlock_irqrestore(shost->host_lock, flags);
1771
1772                         return rport;
1773                 }
1774         }
1775
1776         spin_unlock_irqrestore(shost->host_lock, flags);
1777
1778         /* No consistent binding found - create new remote port entry */
1779         rport = fc_rport_create(shost, channel, ids);
1780
1781         return rport;
1782 }
1783 EXPORT_SYMBOL(fc_remote_port_add);
1784
1785
1786 /**
1787  * fc_remote_port_delete - notifies the fc transport that a remote
1788  *              port is no longer in existence.
1789  * @rport:      The remote port that no longer exists
1790  *
1791  * The LLDD calls this routine to notify the transport that a remote
1792  * port is no longer part of the topology. Note: Although a port
1793  * may no longer be part of the topology, it may persist in the remote
1794  * ports displayed by the fc_host. We do this under 2 conditions:
1795  * - If the port was a scsi target, we delay its deletion by "blocking" it.
1796  *   This allows the port to temporarily disappear, then reappear without
1797  *   disrupting the SCSI device tree attached to it. During the "blocked"
1798  *   period the port will still exist.
1799  * - If the port was a scsi target and disappears for longer than we
1800  *   expect, we'll delete the port and the tear down the SCSI device tree
1801  *   attached to it. However, we want to semi-persist the target id assigned
1802  *   to that port if it eventually does exist. The port structure will
1803  *   remain (although with minimal information) so that the target id
1804  *   bindings remails.
1805  *
1806  * If the remote port is not an FCP Target, it will be fully torn down
1807  * and deallocated, including the fc_remote_port class device.
1808  *
1809  * If the remote port is an FCP Target, the port will be placed in a
1810  * temporary blocked state. From the LLDD's perspective, the rport no
1811  * longer exists. From the SCSI midlayer's perspective, the SCSI target
1812  * exists, but all sdevs on it are blocked from further I/O. The following
1813  * is then expected:
1814  *   If the remote port does not return (signaled by a LLDD call to
1815  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
1816  *   scsi target is removed - killing all outstanding i/o and removing the
1817  *   scsi devices attached ot it. The port structure will be marked Not
1818  *   Present and be partially cleared, leaving only enough information to
1819  *   recognize the remote port relative to the scsi target id binding if
1820  *   it later appears.  The port will remain as long as there is a valid
1821  *   binding (e.g. until the user changes the binding type or unloads the
1822  *   scsi host with the binding).
1823  *
1824  *   If the remote port returns within the dev_loss_tmo value (and matches
1825  *   according to the target id binding type), the port structure will be
1826  *   reused. If it is no longer a SCSI target, the target will be torn
1827  *   down. If it continues to be a SCSI target, then the target will be
1828  *   unblocked (allowing i/o to be resumed), and a scan will be activated
1829  *   to ensure that all luns are detected.
1830  *
1831  * Called from normal process context only - cannot be called from interrupt.
1832  *
1833  * Notes:
1834  *      This routine assumes no locks are held on entry.
1835  **/
1836 void
1837 fc_remote_port_delete(struct fc_rport  *rport)
1838 {
1839         struct Scsi_Host *shost = rport_to_shost(rport);
1840         int timeout = rport->dev_loss_tmo;
1841         unsigned long flags;
1842
1843         /*
1844          * No need to flush the fc_host work_q's, as all adds are synchronous.
1845          *
1846          * We do need to reclaim the rport scan work element, so eventually
1847          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
1848          * there's still a scan pending.
1849          */
1850
1851         spin_lock_irqsave(shost->host_lock, flags);
1852
1853         /* If no scsi target id mapping, delete it */
1854         if (rport->scsi_target_id == -1) {
1855                 list_del(&rport->peers);
1856                 rport->port_state = FC_PORTSTATE_DELETED;
1857                 fc_queue_work(shost, &rport->rport_delete_work);
1858                 spin_unlock_irqrestore(shost->host_lock, flags);
1859                 return;
1860         }
1861
1862         rport->port_state = FC_PORTSTATE_BLOCKED;
1863
1864         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
1865
1866         spin_unlock_irqrestore(shost->host_lock, flags);
1867
1868         scsi_target_block(&rport->dev);
1869
1870         /* cap the length the devices can be blocked until they are deleted */
1871         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
1872 }
1873 EXPORT_SYMBOL(fc_remote_port_delete);
1874
1875 /**
1876  * fc_remote_port_rolechg - notifies the fc transport that the roles
1877  *              on a remote may have changed.
1878  * @rport:      The remote port that changed.
1879  *
1880  * The LLDD calls this routine to notify the transport that the roles
1881  * on a remote port may have changed. The largest effect of this is
1882  * if a port now becomes a FCP Target, it must be allocated a
1883  * scsi target id.  If the port is no longer a FCP target, any
1884  * scsi target id value assigned to it will persist in case the
1885  * role changes back to include FCP Target. No changes in the scsi
1886  * midlayer will be invoked if the role changes (in the expectation
1887  * that the role will be resumed. If it doesn't normal error processing
1888  * will take place).
1889  *
1890  * Should not be called from interrupt context.
1891  *
1892  * Notes:
1893  *      This routine assumes no locks are held on entry.
1894  **/
1895 void
1896 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1897 {
1898         struct Scsi_Host *shost = rport_to_shost(rport);
1899         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1900         unsigned long flags;
1901         int create = 0;
1902
1903         spin_lock_irqsave(shost->host_lock, flags);
1904         if (roles & FC_RPORT_ROLE_FCP_TARGET) {
1905                 if (rport->scsi_target_id == -1) {
1906                         rport->scsi_target_id = fc_host->next_target_id++;
1907                         create = 1;
1908                 } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
1909                         create = 1;
1910         }
1911
1912         rport->roles = roles;
1913
1914         spin_unlock_irqrestore(shost->host_lock, flags);
1915
1916         if (create) {
1917                 /*
1918                  * There may have been a delete timer running on the
1919                  * port. Ensure that it is cancelled as we now know
1920                  * the port is an FCP Target.
1921                  * Note: we know the rport is exists and in an online
1922                  *  state as the LLDD would not have had an rport
1923                  *  reference to pass us.
1924                  *
1925                  * Take no action on the del_timer failure as the state
1926                  * machine state change will validate the
1927                  * transaction.
1928                  */
1929                 if (!cancel_delayed_work(&rport->dev_loss_work))
1930                         fc_flush_devloss(shost);
1931
1932                 spin_lock_irqsave(shost->host_lock, flags);
1933                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1934                 spin_unlock_irqrestore(shost->host_lock, flags);
1935
1936                 /* ensure any stgt delete functions are done */
1937                 fc_flush_work(shost);
1938
1939                 /* initiate a scan of the target */
1940                 spin_lock_irqsave(shost->host_lock, flags);
1941                 rport->flags |= FC_RPORT_SCAN_PENDING;
1942                 scsi_queue_work(shost, &rport->scan_work);
1943                 spin_unlock_irqrestore(shost->host_lock, flags);
1944                 scsi_target_unblock(&rport->dev);
1945         }
1946 }
1947 EXPORT_SYMBOL(fc_remote_port_rolechg);
1948
1949 /**
1950  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
1951  *                       was a SCSI target (thus was blocked), and failed
1952  *                       to return in the alloted time.
1953  *
1954  * @data:       rport target that failed to reappear in the alloted time.
1955  **/
1956 static void
1957 fc_timeout_deleted_rport(void  *data)
1958 {
1959         struct fc_rport *rport = (struct fc_rport *)data;
1960         struct Scsi_Host *shost = rport_to_shost(rport);
1961         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1962         unsigned long flags;
1963
1964         spin_lock_irqsave(shost->host_lock, flags);
1965
1966         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1967
1968         /*
1969          * If the port is ONLINE, then it came back. Validate it's still an
1970          * FCP target. If not, tear down the scsi_target on it.
1971          */
1972         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
1973             !(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
1974                 dev_printk(KERN_ERR, &rport->dev,
1975                         "blocked FC remote port time out: no longer"
1976                         " a FCP target, removing starget\n");
1977                 spin_unlock_irqrestore(shost->host_lock, flags);
1978                 scsi_target_unblock(&rport->dev);
1979                 fc_queue_work(shost, &rport->stgt_delete_work);
1980                 return;
1981         }
1982
1983         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
1984                 spin_unlock_irqrestore(shost->host_lock, flags);
1985                 dev_printk(KERN_ERR, &rport->dev,
1986                         "blocked FC remote port time out: leaving target alone\n");
1987                 return;
1988         }
1989
1990         if (fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) {
1991                 list_del(&rport->peers);
1992                 rport->port_state = FC_PORTSTATE_DELETED;
1993                 dev_printk(KERN_ERR, &rport->dev,
1994                         "blocked FC remote port time out: removing target\n");
1995                 fc_queue_work(shost, &rport->rport_delete_work);
1996                 spin_unlock_irqrestore(shost->host_lock, flags);
1997                 return;
1998         }
1999
2000         dev_printk(KERN_ERR, &rport->dev,
2001                 "blocked FC remote port time out: removing target and "
2002                 "saving binding\n");
2003
2004         list_move_tail(&rport->peers, &fc_host->rport_bindings);
2005
2006         /*
2007          * Note: We do not remove or clear the hostdata area. This allows
2008          *   host-specific target data to persist along with the
2009          *   scsi_target_id. It's up to the host to manage it's hostdata area.
2010          */
2011
2012         /*
2013          * Reinitialize port attributes that may change if the port comes back.
2014          */
2015         rport->maxframe_size = -1;
2016         rport->supported_classes = FC_COS_UNSPECIFIED;
2017         rport->roles = FC_RPORT_ROLE_UNKNOWN;
2018         rport->port_state = FC_PORTSTATE_NOTPRESENT;
2019
2020         /* remove the identifiers that aren't used in the consisting binding */
2021         switch (fc_host->tgtid_bind_type) {
2022         case FC_TGTID_BIND_BY_WWPN:
2023                 rport->node_name = -1;
2024                 rport->port_id = -1;
2025                 break;
2026         case FC_TGTID_BIND_BY_WWNN:
2027                 rport->port_name = -1;
2028                 rport->port_id = -1;
2029                 break;
2030         case FC_TGTID_BIND_BY_ID:
2031                 rport->node_name = -1;
2032                 rport->port_name = -1;
2033                 break;
2034         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
2035                 break;
2036         }
2037
2038         /*
2039          * As this only occurs if the remote port (scsi target)
2040          * went away and didn't come back - we'll remove
2041          * all attached scsi devices.
2042          */
2043         spin_unlock_irqrestore(shost->host_lock, flags);
2044
2045         scsi_target_unblock(&rport->dev);
2046         fc_queue_work(shost, &rport->stgt_delete_work);
2047 }
2048
2049 /**
2050  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
2051  *
2052  * @data:       remote port to be scanned.
2053  **/
2054 static void
2055 fc_scsi_scan_rport(void *data)
2056 {
2057         struct fc_rport *rport = (struct fc_rport *)data;
2058         struct Scsi_Host *shost = rport_to_shost(rport);
2059         unsigned long flags;
2060
2061         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2062             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2063                 scsi_scan_target(&rport->dev, rport->channel,
2064                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
2065         }
2066
2067         spin_lock_irqsave(shost->host_lock, flags);
2068         rport->flags &= ~FC_RPORT_SCAN_PENDING;
2069         spin_unlock_irqrestore(shost->host_lock, flags);
2070 }
2071
2072
2073 MODULE_AUTHOR("Martin Hicks");
2074 MODULE_DESCRIPTION("FC Transport Attributes");
2075 MODULE_LICENSE("GPL");
2076
2077 module_init(fc_transport_init);
2078 module_exit(fc_transport_exit);