git.oblomov.eu Git - linux-2.6/blob - 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_priv.h"
  35
  36 /*
  37  * Redefine so that we can have same named attributes in the
  38  * sdev/starget/host objects.
  39  */
  40 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  41 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  42         __ATTR(_name,_mode,_show,_store)
  43
  44 #define fc_enum_name_search(title, table_type, table)                   \
  45 static const char *get_fc_##title##_name(enum table_type table_key)     \
  46 {                                                                       \
  47         int i;                                                          \
  48         char *name = NULL;                                              \
  49                                                                         \
  50         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
  51                 if (table[i].value == table_key) {                      \
  52                         name = table[i].name;                           \
  53                         break;                                          \
  54                 }                                                       \
  55         }                                                               \
  56         return name;                                                    \
  57 }
  58
  59 #define fc_enum_name_match(title, table_type, table)                    \
  60 static int get_fc_##title##_match(const char *table_key,                \
  61                 enum table_type *value)                                 \
  62 {                                                                       \
  63         int i;                                                          \
  64                                                                         \
  65         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
  66                 if (strncmp(table_key, table[i].name,                   \
  67                                 table[i].matchlen) == 0) {              \
  68                         *value = table[i].value;                        \
  69                         return 0; /* success */                         \
  70                 }                                                       \
  71         }                                                               \
  72         return 1; /* failure */                                         \
  73 }
  74
  75
  76 /* Convert fc_port_type values to ascii string name */
  77 static struct {
  78         enum fc_port_type       value;
  79         char                    *name;
  80 } fc_port_type_names[] = {
  81         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  82         { FC_PORTTYPE_OTHER,            "Other" },
  83         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  84         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  85         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  86         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  87         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  88 };
  89 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  90 #define FC_PORTTYPE_MAX_NAMELEN         50
  91
  92
  93 /* Convert fc_port_state values to ascii string name */
  94 static struct {
  95         enum fc_port_state      value;
  96         char                    *name;
  97 } fc_port_state_names[] = {
  98         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
  99         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 100         { FC_PORTSTATE_ONLINE,          "Online" },
 101         { FC_PORTSTATE_OFFLINE,         "Offline" },
 102         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 103         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 104         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 105         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 106         { FC_PORTSTATE_ERROR,           "Error" },
 107         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 108         { FC_PORTSTATE_DELETED,         "Deleted" },
 109 };
 110 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 111 #define FC_PORTSTATE_MAX_NAMELEN        20
 112
 113
 114 /* Convert fc_tgtid_binding_type values to ascii string name */
 115 static const struct {
 116         enum fc_tgtid_binding_type      value;
 117         char                            *name;
 118         int                             matchlen;
 119 } fc_tgtid_binding_type_names[] = {
 120         { FC_TGTID_BIND_NONE, "none", 4 },
 121         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 122         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 123         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 124 };
 125 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 126                 fc_tgtid_binding_type_names)
 127 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 128                 fc_tgtid_binding_type_names)
 129 #define FC_BINDTYPE_MAX_NAMELEN 30
 130
 131
 132 #define fc_bitfield_name_search(title, table)                   \
 133 static ssize_t                                                  \
 134 get_fc_##title##_names(u32 table_key, char *buf)                \
 135 {                                                               \
 136         char *prefix = "";                                      \
 137         ssize_t len = 0;                                        \
 138         int i;                                                  \
 139                                                                 \
 140         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 141                 if (table[i].value & table_key) {               \
 142                         len += sprintf(buf + len, "%s%s",       \
 143                                 prefix, table[i].name);         \
 144                         prefix = ", ";                          \
 145                 }                                               \
 146         }                                                       \
 147         len += sprintf(buf + len, "\n");                        \
 148         return len;                                             \
 149 }
 150
 151
 152 /* Convert FC_COS bit values to ascii string name */
 153 static const struct {
 154         u32                     value;
 155         char                    *name;
 156 } fc_cos_names[] = {
 157         { FC_COS_CLASS1,        "Class 1" },
 158         { FC_COS_CLASS2,        "Class 2" },
 159         { FC_COS_CLASS3,        "Class 3" },
 160         { FC_COS_CLASS4,        "Class 4" },
 161         { FC_COS_CLASS6,        "Class 6" },
 162 };
 163 fc_bitfield_name_search(cos, fc_cos_names)
 164
 165
 166 /* Convert FC_PORTSPEED bit values to ascii string name */
 167 static const struct {
 168         u32                     value;
 169         char                    *name;
 170 } fc_port_speed_names[] = {
 171         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 172         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 173         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 174         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 175         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 176 };
 177 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 178
 179
 180 static int
 181 show_fc_fc4s (char *buf, u8 *fc4_list)
 182 {
 183         int i, len=0;
 184
 185         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 186                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 187         len += sprintf(buf + len, "\n");
 188         return len;
 189 }
 190
 191
 192 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 193 static const struct {
 194         u32                     value;
 195         char                    *name;
 196 } fc_remote_port_role_names[] = {
 197         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 198         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 199         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 200 };
 201 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 202
 203 /*
 204  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 205  */
 206 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 207 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 208 #define FC_FPORT_PORTID                 0x00000e
 209 #define FC_FABCTLR_PORTID               0x00000d
 210 #define FC_DIRSRVR_PORTID               0x00000c
 211 #define FC_TIMESRVR_PORTID              0x00000b
 212 #define FC_MGMTSRVR_PORTID              0x00000a
 213
 214
 215 static void fc_shost_remove_rports(void  *data);
 216 static void fc_timeout_deleted_rport(void *data);
 217 static void fc_scsi_scan_rport(void *data);
 218 static void fc_rport_terminate(struct fc_rport  *rport);
 219
 220 /*
 221  * Attribute counts pre object type...
 222  * Increase these values if you add attributes
 223  */
 224 #define FC_STARGET_NUM_ATTRS    3
 225 #define FC_RPORT_NUM_ATTRS      9
 226 #define FC_HOST_NUM_ATTRS       16
 227
 228 struct fc_internal {
 229         struct scsi_transport_template t;
 230         struct fc_function_template *f;
 231
 232         /*
 233          * For attributes : each object has :
 234          *   An array of the actual attributes structures
 235          *   An array of null-terminated pointers to the attribute
 236          *     structures - used for mid-layer interaction.
 237          *
 238          * The attribute containers for the starget and host are are
 239          * part of the midlayer. As the remote port is specific to the
 240          * fc transport, we must provide the attribute container.
 241          */
 242         struct class_device_attribute private_starget_attrs[
 243                                                         FC_STARGET_NUM_ATTRS];
 244         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 245
 246         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 247         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 248
 249         struct transport_container rport_attr_cont;
 250         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 251         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 252 };
 253
 254 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 255
 256 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 257                            struct class_device *cdev)
 258 {
 259         struct scsi_target *starget = to_scsi_target(dev);
 260         struct fc_rport *rport = starget_to_rport(starget);
 261
 262         /*
 263          * if parent is remote port, use values from remote port.
 264          * Otherwise, this host uses the fc_transport, but not the
 265          * remote port interface. As such, initialize to known non-values.
 266          */
 267         if (rport) {
 268                 fc_starget_node_name(starget) = rport->node_name;
 269                 fc_starget_port_name(starget) = rport->port_name;
 270                 fc_starget_port_id(starget) = rport->port_id;
 271         } else {
 272                 fc_starget_node_name(starget) = -1;
 273                 fc_starget_port_name(starget) = -1;
 274                 fc_starget_port_id(starget) = -1;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 281                                "fc_transport",
 282                                fc_target_setup,
 283                                NULL,
 284                                NULL);
 285
 286 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 287                          struct class_device *cdev)
 288 {
 289         struct Scsi_Host *shost = dev_to_shost(dev);
 290
 291         /*
 292          * Set default values easily detected by the midlayer as
 293          * failure cases.  The scsi lldd is responsible for initializing
 294          * all transport attributes to valid values per host.
 295          */
 296         fc_host_node_name(shost) = -1;
 297         fc_host_port_name(shost) = -1;
 298         fc_host_permanent_port_name(shost) = -1;
 299         fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
 300         memset(fc_host_supported_fc4s(shost), 0,
 301                 sizeof(fc_host_supported_fc4s(shost)));
 302         memset(fc_host_symbolic_name(shost), 0,
 303                 sizeof(fc_host_symbolic_name(shost)));
 304         fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
 305         fc_host_maxframe_size(shost) = -1;
 306         memset(fc_host_serial_number(shost), 0,
 307                 sizeof(fc_host_serial_number(shost)));
 308
 309         fc_host_port_id(shost) = -1;
 310         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 311         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 312         memset(fc_host_active_fc4s(shost), 0,
 313                 sizeof(fc_host_active_fc4s(shost)));
 314         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 315         fc_host_fabric_name(shost) = -1;
 316
 317         fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
 318
 319         INIT_LIST_HEAD(&fc_host_rports(shost));
 320         INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
 321         fc_host_next_rport_number(shost) = 0;
 322         fc_host_next_target_id(shost) = 0;
 323
 324         fc_host_flags(shost) = 0;
 325         INIT_WORK(&fc_host_rport_del_work(shost), fc_shost_remove_rports, shost);
 326         return 0;
 327 }
 328
 329 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 330                                "fc_host",
 331                                fc_host_setup,
 332                                NULL,
 333                                NULL);
 334
 335 /*
 336  * Setup and Remove actions for remote ports are handled
 337  * in the service functions below.
 338  */
 339 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 340                                "fc_remote_ports",
 341                                NULL,
 342                                NULL,
 343                                NULL);
 344
 345 /*
 346  * Module Parameters
 347  */
 348
 349 /*
 350  * dev_loss_tmo: the default number of seconds that the FC transport
 351  *   should insulate the loss of a remote port.
 352  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 353  */
 354 static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
 355
 356 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 357 MODULE_PARM_DESC(dev_loss_tmo,
 358                  "Maximum number of seconds that the FC transport should"
 359                  " insulate the loss of a remote port. Once this value is"
 360                  " exceeded, the scsi target is removed. Value should be"
 361                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 362
 363
 364 static __init int fc_transport_init(void)
 365 {
 366         int error = transport_class_register(&fc_host_class);
 367         if (error)
 368                 return error;
 369         error = transport_class_register(&fc_rport_class);
 370         if (error)
 371                 return error;
 372         return transport_class_register(&fc_transport_class);
 373 }
 374
 375 static void __exit fc_transport_exit(void)
 376 {
 377         transport_class_unregister(&fc_transport_class);
 378         transport_class_unregister(&fc_rport_class);
 379         transport_class_unregister(&fc_host_class);
 380 }
 381
 382 /*
 383  * FC Remote Port Attribute Management
 384  */
 385
 386 #define fc_rport_show_function(field, format_string, sz, cast)          \
 387 static ssize_t                                                          \
 388 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 389 {                                                                       \
 390         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 391         struct Scsi_Host *shost = rport_to_shost(rport);                \
 392         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 393         if ((i->f->get_rport_##field) &&                                \
 394             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 395               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 396               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 397                 i->f->get_rport_##field(rport);                         \
 398         return snprintf(buf, sz, format_string, cast rport->field);     \
 399 }
 400
 401 #define fc_rport_store_function(field)                                  \
 402 static ssize_t                                                          \
 403 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 404                            size_t count)                                \
 405 {                                                                       \
 406         int val;                                                        \
 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 ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 411             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 412             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 413                 return -EBUSY;                                          \
 414         val = simple_strtoul(buf, NULL, 0);                             \
 415         i->f->set_rport_##field(rport, val);                            \
 416         return count;                                                   \
 417 }
 418
 419 #define fc_rport_rd_attr(field, format_string, sz)                      \
 420         fc_rport_show_function(field, format_string, sz, )              \
 421 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 422                          show_fc_rport_##field, NULL)
 423
 424 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 425         fc_rport_show_function(field, format_string, sz, (cast))        \
 426 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 427                           show_fc_rport_##field, NULL)
 428
 429 #define fc_rport_rw_attr(field, format_string, sz)                      \
 430         fc_rport_show_function(field, format_string, sz, )              \
 431         fc_rport_store_function(field)                                  \
 432 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 433                         show_fc_rport_##field,                          \
 434                         store_fc_rport_##field)
 435
 436
 437 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 438 static ssize_t                                                          \
 439 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 440 {                                                                       \
 441         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 442         return snprintf(buf, sz, format_string, cast rport->field);     \
 443 }
 444
 445 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 446         fc_private_rport_show_function(field, format_string, sz, )      \
 447 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 448                          show_fc_rport_##field, NULL)
 449
 450 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 451         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 452 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 453                           show_fc_rport_##field, NULL)
 454
 455
 456 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 457 static ssize_t                                                          \
 458 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 459 {                                                                       \
 460         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 461         const char *name;                                               \
 462         name = get_fc_##title##_name(rport->title);                     \
 463         if (!name)                                                      \
 464                 return -EINVAL;                                         \
 465         return snprintf(buf, maxlen, "%s\n", name);                     \
 466 }                                                                       \
 467 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 468                         show_fc_rport_##title, NULL)
 469
 470
 471 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 472         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 473         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 474         i->private_rport_attrs[count].store = NULL;                     \
 475         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 476         if (i->f->show_rport_##field)                                   \
 477                 count++
 478
 479 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 480         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 481         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 482         i->private_rport_attrs[count].store = NULL;                     \
 483         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 484         count++
 485
 486 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 487         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 488         if (!i->f->set_rport_##field) {                                 \
 489                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 490                 i->private_rport_attrs[count].store = NULL;             \
 491         }                                                               \
 492         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 493         if (i->f->show_rport_##field)                                   \
 494                 count++
 495
 496
 497 /* The FC Transport Remote Port Attributes: */
 498
 499 /* Fixed Remote Port Attributes */
 500
 501 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 502
 503 static ssize_t
 504 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 505 {
 506         struct fc_rport *rport = transport_class_to_rport(cdev);
 507         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 508                 return snprintf(buf, 20, "unspecified\n");
 509         return get_fc_cos_names(rport->supported_classes, buf);
 510 }
 511 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 512                 show_fc_rport_supported_classes, NULL);
 513
 514 /* Dynamic Remote Port Attributes */
 515
 516 /*
 517  * dev_loss_tmo attribute
 518  */
 519 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 520 static ssize_t
 521 store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
 522                            size_t count)
 523 {
 524         int val;
 525         struct fc_rport *rport = transport_class_to_rport(cdev);
 526         struct Scsi_Host *shost = rport_to_shost(rport);
 527         struct fc_internal *i = to_fc_internal(shost->transportt);
 528         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 529             (rport->port_state == FC_PORTSTATE_DELETED) ||
 530             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 531                 return -EBUSY;
 532         val = simple_strtoul(buf, NULL, 0);
 533         if ((val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 534                 return -EINVAL;
 535         i->f->set_rport_dev_loss_tmo(rport, val);
 536         return count;
 537 }
 538 static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 539                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 540
 541
 542 /* Private Remote Port Attributes */
 543
 544 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 545 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 546 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 547
 548 static ssize_t
 549 show_fc_rport_roles (struct class_device *cdev, char *buf)
 550 {
 551         struct fc_rport *rport = transport_class_to_rport(cdev);
 552
 553         /* identify any roles that are port_id specific */
 554         if ((rport->port_id != -1) &&
 555             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 556                                         FC_WELLKNOWN_PORTID_MASK) {
 557                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 558                 case FC_FPORT_PORTID:
 559                         return snprintf(buf, 30, "Fabric Port\n");
 560                 case FC_FABCTLR_PORTID:
 561                         return snprintf(buf, 30, "Fabric Controller\n");
 562                 case FC_DIRSRVR_PORTID:
 563                         return snprintf(buf, 30, "Directory Server\n");
 564                 case FC_TIMESRVR_PORTID:
 565                         return snprintf(buf, 30, "Time Server\n");
 566                 case FC_MGMTSRVR_PORTID:
 567                         return snprintf(buf, 30, "Management Server\n");
 568                 default:
 569                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 570                 }
 571         } else {
 572                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 573                         return snprintf(buf, 20, "unknown\n");
 574                 return get_fc_remote_port_roles_names(rport->roles, buf);
 575         }
 576 }
 577 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 578                 show_fc_rport_roles, NULL);
 579
 580 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 581 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 582
 583
 584
 585 /*
 586  * FC SCSI Target Attribute Management
 587  */
 588
 589 /*
 590  * Note: in the target show function we recognize when the remote
 591  *  port is in the heirarchy and do not allow the driver to get
 592  *  involved in sysfs functions. The driver only gets involved if
 593  *  it's the "old" style that doesn't use rports.
 594  */
 595 #define fc_starget_show_function(field, format_string, sz, cast)        \
 596 static ssize_t                                                          \
 597 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 598 {                                                                       \
 599         struct scsi_target *starget = transport_class_to_starget(cdev); \
 600         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 601         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 602         struct fc_rport *rport = starget_to_rport(starget);             \
 603         if (rport)                                                      \
 604                 fc_starget_##field(starget) = rport->field;             \
 605         else if (i->f->get_starget_##field)                             \
 606                 i->f->get_starget_##field(starget);                     \
 607         return snprintf(buf, sz, format_string,                         \
 608                 cast fc_starget_##field(starget));                      \
 609 }
 610
 611 #define fc_starget_rd_attr(field, format_string, sz)                    \
 612         fc_starget_show_function(field, format_string, sz, )            \
 613 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 614                          show_fc_starget_##field, NULL)
 615
 616 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 617         fc_starget_show_function(field, format_string, sz, (cast))      \
 618 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 619                           show_fc_starget_##field, NULL)
 620
 621 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 622         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 623         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 624         i->private_starget_attrs[count].store = NULL;                   \
 625         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 626         if (i->f->show_starget_##field)                                 \
 627                 count++
 628
 629 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 630         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 631         if (!i->f->set_starget_##field) {                               \
 632                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 633                 i->private_starget_attrs[count].store = NULL;           \
 634         }                                                               \
 635         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 636         if (i->f->show_starget_##field)                                 \
 637                 count++
 638
 639 /* The FC Transport SCSI Target Attributes: */
 640 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 641 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 642 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 643
 644
 645 /*
 646  * Host Attribute Management
 647  */
 648
 649 #define fc_host_show_function(field, format_string, sz, cast)           \
 650 static ssize_t                                                          \
 651 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 652 {                                                                       \
 653         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 654         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 655         if (i->f->get_host_##field)                                     \
 656                 i->f->get_host_##field(shost);                          \
 657         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 658 }
 659
 660 #define fc_host_store_function(field)                                   \
 661 static ssize_t                                                          \
 662 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 663                            size_t count)                                \
 664 {                                                                       \
 665         int val;                                                        \
 666         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 667         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 668                                                                         \
 669         val = simple_strtoul(buf, NULL, 0);                             \
 670         i->f->set_host_##field(shost, val);                             \
 671         return count;                                                   \
 672 }
 673
 674 #define fc_host_rd_attr(field, format_string, sz)                       \
 675         fc_host_show_function(field, format_string, sz, )               \
 676 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 677                          show_fc_host_##field, NULL)
 678
 679 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 680         fc_host_show_function(field, format_string, sz, (cast))         \
 681 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 682                           show_fc_host_##field, NULL)
 683
 684 #define fc_host_rw_attr(field, format_string, sz)                       \
 685         fc_host_show_function(field, format_string, sz, )               \
 686         fc_host_store_function(field)                                   \
 687 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 688                         show_fc_host_##field,                           \
 689                         store_fc_host_##field)
 690
 691 #define fc_host_rd_enum_attr(title, maxlen)                             \
 692 static ssize_t                                                          \
 693 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 694 {                                                                       \
 695         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 696         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 697         const char *name;                                               \
 698         if (i->f->get_host_##title)                                     \
 699                 i->f->get_host_##title(shost);                          \
 700         name = get_fc_##title##_name(fc_host_##title(shost));           \
 701         if (!name)                                                      \
 702                 return -EINVAL;                                         \
 703         return snprintf(buf, maxlen, "%s\n", name);                     \
 704 }                                                                       \
 705 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 706
 707 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 708         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 709         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 710         i->private_host_attrs[count].store = NULL;                      \
 711         i->host_attrs[count] = &i->private_host_attrs[count];           \
 712         if (i->f->show_host_##field)                                    \
 713                 count++
 714
 715 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
 716         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 717         if (!i->f->set_host_##field) {                                  \
 718                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
 719                 i->private_host_attrs[count].store = NULL;              \
 720         }                                                               \
 721         i->host_attrs[count] = &i->private_host_attrs[count];           \
 722         if (i->f->show_host_##field)                                    \
 723                 count++
 724
 725
 726 #define fc_private_host_show_function(field, format_string, sz, cast)   \
 727 static ssize_t                                                          \
 728 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 729 {                                                                       \
 730         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 731         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 732 }
 733
 734 #define fc_private_host_rd_attr(field, format_string, sz)               \
 735         fc_private_host_show_function(field, format_string, sz, )       \
 736 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 737                          show_fc_host_##field, NULL)
 738
 739 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
 740         fc_private_host_show_function(field, format_string, sz, (cast)) \
 741 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 742                           show_fc_host_##field, NULL)
 743
 744 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
 745         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 746         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 747         i->private_host_attrs[count].store = NULL;                      \
 748         i->host_attrs[count] = &i->private_host_attrs[count];           \
 749         count++
 750
 751 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
 752 {                                                                       \
 753         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 754         i->host_attrs[count] = &i->private_host_attrs[count];           \
 755         count++;                                                        \
 756 }
 757
 758
 759 /* Fixed Host Attributes */
 760
 761 static ssize_t
 762 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
 763 {
 764         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 765
 766         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
 767                 return snprintf(buf, 20, "unspecified\n");
 768
 769         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
 770 }
 771 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
 772                 show_fc_host_supported_classes, NULL);
 773
 774 static ssize_t
 775 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
 776 {
 777         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 778         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
 779 }
 780 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
 781                 show_fc_host_supported_fc4s, NULL);
 782
 783 static ssize_t
 784 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
 785 {
 786         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 787
 788         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
 789                 return snprintf(buf, 20, "unknown\n");
 790
 791         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
 792 }
 793 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 794                 show_fc_host_supported_speeds, NULL);
 795
 796
 797 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 798 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 799 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
 800                              unsigned long long);
 801 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
 802 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 803 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
 804
 805
 806 /* Dynamic Host Attributes */
 807
 808 static ssize_t
 809 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
 810 {
 811         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 812         struct fc_internal *i = to_fc_internal(shost->transportt);
 813
 814         if (i->f->get_host_active_fc4s)
 815                 i->f->get_host_active_fc4s(shost);
 816
 817         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
 818 }
 819 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
 820                 show_fc_host_active_fc4s, NULL);
 821
 822 static ssize_t
 823 show_fc_host_speed (struct class_device *cdev, char *buf)
 824 {
 825         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 826         struct fc_internal *i = to_fc_internal(shost->transportt);
 827
 828         if (i->f->get_host_speed)
 829                 i->f->get_host_speed(shost);
 830
 831         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
 832                 return snprintf(buf, 20, "unknown\n");
 833
 834         return get_fc_port_speed_names(fc_host_speed(shost), buf);
 835 }
 836 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
 837                 show_fc_host_speed, NULL);
 838
 839
 840 fc_host_rd_attr(port_id, "0x%06x\n", 20);
 841 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
 842 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 843 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 844
 845
 846 /* Private Host Attributes */
 847
 848 static ssize_t
 849 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
 850 {
 851         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 852         const char *name;
 853
 854         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
 855         if (!name)
 856                 return -EINVAL;
 857         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 858 }
 859
 860 #define get_list_head_entry(pos, head, member)          \
 861         pos = list_entry((head)->next, typeof(*pos), member)
 862
 863 static ssize_t
 864 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
 865         const char *buf, size_t count)
 866 {
 867         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 868         struct fc_rport *rport;
 869         enum fc_tgtid_binding_type val;
 870         unsigned long flags;
 871
 872         if (get_fc_tgtid_bind_type_match(buf, &val))
 873                 return -EINVAL;
 874
 875         /* if changing bind type, purge all unused consistent bindings */
 876         if (val != fc_host_tgtid_bind_type(shost)) {
 877                 spin_lock_irqsave(shost->host_lock, flags);
 878                 while (!list_empty(&fc_host_rport_bindings(shost))) {
 879                         get_list_head_entry(rport,
 880                                 &fc_host_rport_bindings(shost), peers);
 881                         spin_unlock_irqrestore(shost->host_lock, flags);
 882                         fc_rport_terminate(rport);
 883                         spin_lock_irqsave(shost->host_lock, flags);
 884                 }
 885                 spin_unlock_irqrestore(shost->host_lock, flags);
 886         }
 887
 888         fc_host_tgtid_bind_type(shost) = val;
 889         return count;
 890 }
 891
 892 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
 893                         show_fc_private_host_tgtid_bind_type,
 894                         store_fc_private_host_tgtid_bind_type);
 895
 896 static ssize_t
 897 store_fc_private_host_issue_lip(struct class_device *cdev,
 898         const char *buf, size_t count)
 899 {
 900         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 901         struct fc_internal *i = to_fc_internal(shost->transportt);
 902         int ret;
 903
 904         /* ignore any data value written to the attribute */
 905         if (i->f->issue_fc_host_lip) {
 906                 ret = i->f->issue_fc_host_lip(shost);
 907                 return ret ? ret: count;
 908         }
 909
 910         return -ENOENT;
 911 }
 912
 913 static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
 914                         store_fc_private_host_issue_lip);
 915
 916 /*
 917  * Host Statistics Management
 918  */
 919
 920 /* Show a given an attribute in the statistics group */
 921 static ssize_t
 922 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
 923 {
 924         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 925         struct fc_internal *i = to_fc_internal(shost->transportt);
 926         struct fc_host_statistics *stats;
 927         ssize_t ret = -ENOENT;
 928
 929         if (offset > sizeof(struct fc_host_statistics) ||
 930             offset % sizeof(u64) != 0)
 931                 WARN_ON(1);
 932
 933         if (i->f->get_fc_host_stats) {
 934                 stats = (i->f->get_fc_host_stats)(shost);
 935                 if (stats)
 936                         ret = snprintf(buf, 20, "0x%llx\n",
 937                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
 938         }
 939         return ret;
 940 }
 941
 942
 943 /* generate a read-only statistics attribute */
 944 #define fc_host_statistic(name)                                         \
 945 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
 946 {                                                                       \
 947         return fc_stat_show(cd, buf,                                    \
 948                             offsetof(struct fc_host_statistics, name)); \
 949 }                                                                       \
 950 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
 951
 952 fc_host_statistic(seconds_since_last_reset);
 953 fc_host_statistic(tx_frames);
 954 fc_host_statistic(tx_words);
 955 fc_host_statistic(rx_frames);
 956 fc_host_statistic(rx_words);
 957 fc_host_statistic(lip_count);
 958 fc_host_statistic(nos_count);
 959 fc_host_statistic(error_frames);
 960 fc_host_statistic(dumped_frames);
 961 fc_host_statistic(link_failure_count);
 962 fc_host_statistic(loss_of_sync_count);
 963 fc_host_statistic(loss_of_signal_count);
 964 fc_host_statistic(prim_seq_protocol_err_count);
 965 fc_host_statistic(invalid_tx_word_count);
 966 fc_host_statistic(invalid_crc_count);
 967 fc_host_statistic(fcp_input_requests);
 968 fc_host_statistic(fcp_output_requests);
 969 fc_host_statistic(fcp_control_requests);
 970 fc_host_statistic(fcp_input_megabytes);
 971 fc_host_statistic(fcp_output_megabytes);
 972
 973 static ssize_t
 974 fc_reset_statistics(struct class_device *cdev, const char *buf,
 975                            size_t count)
 976 {
 977         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 978         struct fc_internal *i = to_fc_internal(shost->transportt);
 979
 980         /* ignore any data value written to the attribute */
 981         if (i->f->reset_fc_host_stats) {
 982                 i->f->reset_fc_host_stats(shost);
 983                 return count;
 984         }
 985
 986         return -ENOENT;
 987 }
 988 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
 989                                 fc_reset_statistics);
 990
 991
 992 static struct attribute *fc_statistics_attrs[] = {
 993         &class_device_attr_host_seconds_since_last_reset.attr,
 994         &class_device_attr_host_tx_frames.attr,
 995         &class_device_attr_host_tx_words.attr,
 996         &class_device_attr_host_rx_frames.attr,
 997         &class_device_attr_host_rx_words.attr,
 998         &class_device_attr_host_lip_count.attr,
 999         &class_device_attr_host_nos_count.attr,
1000         &class_device_attr_host_error_frames.attr,
1001         &class_device_attr_host_dumped_frames.attr,
1002         &class_device_attr_host_link_failure_count.attr,
1003         &class_device_attr_host_loss_of_sync_count.attr,
1004         &class_device_attr_host_loss_of_signal_count.attr,
1005         &class_device_attr_host_prim_seq_protocol_err_count.attr,
1006         &class_device_attr_host_invalid_tx_word_count.attr,
1007         &class_device_attr_host_invalid_crc_count.attr,
1008         &class_device_attr_host_fcp_input_requests.attr,
1009         &class_device_attr_host_fcp_output_requests.attr,
1010         &class_device_attr_host_fcp_control_requests.attr,
1011         &class_device_attr_host_fcp_input_megabytes.attr,
1012         &class_device_attr_host_fcp_output_megabytes.attr,
1013         &class_device_attr_host_reset_statistics.attr,
1014         NULL
1015 };
1016
1017 static struct attribute_group fc_statistics_group = {
1018         .name = "statistics",
1019         .attrs = fc_statistics_attrs,
1020 };
1021
1022 static int fc_host_match(struct attribute_container *cont,
1023                           struct device *dev)
1024 {
1025         struct Scsi_Host *shost;
1026         struct fc_internal *i;
1027
1028         if (!scsi_is_host_device(dev))
1029                 return 0;
1030
1031         shost = dev_to_shost(dev);
1032         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1033             != &fc_host_class.class)
1034                 return 0;
1035
1036         i = to_fc_internal(shost->transportt);
1037
1038         return &i->t.host_attrs.ac == cont;
1039 }
1040
1041 static int fc_target_match(struct attribute_container *cont,
1042                             struct device *dev)
1043 {
1044         struct Scsi_Host *shost;
1045         struct fc_internal *i;
1046
1047         if (!scsi_is_target_device(dev))
1048                 return 0;
1049
1050         shost = dev_to_shost(dev->parent);
1051         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1052             != &fc_host_class.class)
1053                 return 0;
1054
1055         i = to_fc_internal(shost->transportt);
1056
1057         return &i->t.target_attrs.ac == cont;
1058 }
1059
1060 static void fc_rport_dev_release(struct device *dev)
1061 {
1062         struct fc_rport *rport = dev_to_rport(dev);
1063         put_device(dev->parent);
1064         kfree(rport);
1065 }
1066
1067 int scsi_is_fc_rport(const struct device *dev)
1068 {
1069         return dev->release == fc_rport_dev_release;
1070 }
1071 EXPORT_SYMBOL(scsi_is_fc_rport);
1072
1073 static int fc_rport_match(struct attribute_container *cont,
1074                             struct device *dev)
1075 {
1076         struct Scsi_Host *shost;
1077         struct fc_internal *i;
1078
1079         if (!scsi_is_fc_rport(dev))
1080                 return 0;
1081
1082         shost = dev_to_shost(dev->parent);
1083         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1084             != &fc_host_class.class)
1085                 return 0;
1086
1087         i = to_fc_internal(shost->transportt);
1088
1089         return &i->rport_attr_cont.ac == cont;
1090 }
1091
1092
1093 /*
1094  * Must be called with shost->host_lock held
1095  */
1096 static int fc_user_scan(struct Scsi_Host *shost, uint channel,
1097                 uint id, uint lun)
1098 {
1099         struct fc_rport *rport;
1100
1101         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1102                 if (rport->scsi_target_id == -1)
1103                         continue;
1104
1105                 if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
1106                     (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
1107                         scsi_scan_target(&rport->dev, rport->channel,
1108                                          rport->scsi_target_id, lun, 1);
1109                 }
1110         }
1111
1112         return 0;
1113 }
1114
1115 struct scsi_transport_template *
1116 fc_attach_transport(struct fc_function_template *ft)
1117 {
1118         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
1119                                         GFP_KERNEL);
1120         int count;
1121
1122         if (unlikely(!i))
1123                 return NULL;
1124
1125         memset(i, 0, sizeof(struct fc_internal));
1126
1127         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1128         i->t.target_attrs.ac.class = &fc_transport_class.class;
1129         i->t.target_attrs.ac.match = fc_target_match;
1130         i->t.target_size = sizeof(struct fc_starget_attrs);
1131         transport_container_register(&i->t.target_attrs);
1132
1133         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1134         i->t.host_attrs.ac.class = &fc_host_class.class;
1135         i->t.host_attrs.ac.match = fc_host_match;
1136         i->t.host_size = sizeof(struct fc_host_attrs);
1137         if (ft->get_fc_host_stats)
1138                 i->t.host_attrs.statistics = &fc_statistics_group;
1139         transport_container_register(&i->t.host_attrs);
1140
1141         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1142         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1143         i->rport_attr_cont.ac.match = fc_rport_match;
1144         transport_container_register(&i->rport_attr_cont);
1145
1146         i->f = ft;
1147
1148         /* Transport uses the shost workq for scsi scanning */
1149         i->t.create_work_queue = 1;
1150
1151         i->t.user_scan = fc_user_scan;
1152
1153         /*
1154          * Setup SCSI Target Attributes.
1155          */
1156         count = 0;
1157         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1158         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1159         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1160
1161         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1162
1163         i->starget_attrs[count] = NULL;
1164
1165
1166         /*
1167          * Setup SCSI Host Attributes.
1168          */
1169         count=0;
1170         SETUP_HOST_ATTRIBUTE_RD(node_name);
1171         SETUP_HOST_ATTRIBUTE_RD(port_name);
1172         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
1173         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1174         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1175         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1176         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1177         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1178         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1179
1180         SETUP_HOST_ATTRIBUTE_RD(port_id);
1181         SETUP_HOST_ATTRIBUTE_RD(port_type);
1182         SETUP_HOST_ATTRIBUTE_RD(port_state);
1183         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1184         SETUP_HOST_ATTRIBUTE_RD(speed);
1185         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1186
1187         /* Transport-managed attributes */
1188         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1189         if (ft->issue_fc_host_lip)
1190                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
1191
1192         BUG_ON(count > FC_HOST_NUM_ATTRS);
1193
1194         i->host_attrs[count] = NULL;
1195
1196         /*
1197          * Setup Remote Port Attributes.
1198          */
1199         count=0;
1200         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1201         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1202         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1203         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1204         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1205         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1206         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1207         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1208         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1209
1210         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1211
1212         i->rport_attrs[count] = NULL;
1213
1214         return &i->t;
1215 }
1216 EXPORT_SYMBOL(fc_attach_transport);
1217
1218 void fc_release_transport(struct scsi_transport_template *t)
1219 {
1220         struct fc_internal *i = to_fc_internal(t);
1221
1222         transport_container_unregister(&i->t.target_attrs);
1223         transport_container_unregister(&i->t.host_attrs);
1224         transport_container_unregister(&i->rport_attr_cont);
1225
1226         kfree(i);
1227 }
1228 EXPORT_SYMBOL(fc_release_transport);
1229
1230
1231 /**
1232  * fc_remove_host - called to terminate any fc_transport-related elements
1233  *                  for a scsi host.
1234  * @rport:      remote port to be unblocked.
1235  *
1236  * This routine is expected to be called immediately preceeding the
1237  * a driver's call to scsi_remove_host().
1238  *
1239  * WARNING: A driver utilizing the fc_transport, which fails to call
1240  *   this routine prior to scsi_remote_host(), will leave dangling
1241  *   objects in /sys/class/fc_remote_ports. Access to any of these
1242  *   objects can result in a system crash !!!
1243  *
1244  * Notes:
1245  *      This routine assumes no locks are held on entry.
1246  **/
1247 void
1248 fc_remove_host(struct Scsi_Host *shost)
1249 {
1250         struct fc_rport *rport, *next_rport;
1251
1252         /* Remove any remote ports */
1253         list_for_each_entry_safe(rport, next_rport,
1254                         &fc_host_rports(shost), peers)
1255                 fc_rport_terminate(rport);
1256         list_for_each_entry_safe(rport, next_rport,
1257                         &fc_host_rport_bindings(shost), peers)
1258                 fc_rport_terminate(rport);
1259 }
1260 EXPORT_SYMBOL(fc_remove_host);
1261
1262 /*
1263  * fc_rport_tgt_remove - Removes the scsi target on the remote port
1264  * @rport:      The remote port to be operated on
1265  */
1266 static void
1267 fc_rport_tgt_remove(struct fc_rport *rport)
1268 {
1269         struct Scsi_Host *shost = rport_to_shost(rport);
1270
1271         scsi_target_unblock(&rport->dev);
1272
1273         /* Stop anything on the workq */
1274         if (!cancel_delayed_work(&rport->dev_loss_work))
1275                 flush_scheduled_work();
1276         scsi_flush_work(shost);
1277
1278         scsi_remove_target(&rport->dev);
1279 }
1280
1281 /**
1282  * fc_rport_create - allocates and creates a remote FC port.
1283  * @shost:      scsi host the remote port is connected to.
1284  * @channel:    Channel on shost port connected to.
1285  * @ids:        The world wide names, fc address, and FC4 port
1286  *              roles for the remote port.
1287  *
1288  * Allocates and creates the remoter port structure, including the
1289  * class and sysfs creation.
1290  *
1291  * Notes:
1292  *      This routine assumes no locks are held on entry.
1293  **/
1294 struct fc_rport *
1295 fc_rport_create(struct Scsi_Host *shost, int channel,
1296         struct fc_rport_identifiers  *ids)
1297 {
1298         struct fc_host_attrs *fc_host =
1299                         (struct fc_host_attrs *)shost->shost_data;
1300         struct fc_internal *fci = to_fc_internal(shost->transportt);
1301         struct fc_rport *rport;
1302         struct device *dev;
1303         unsigned long flags;
1304         int error;
1305         size_t size;
1306
1307         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1308         rport = kmalloc(size, GFP_KERNEL);
1309         if (unlikely(!rport)) {
1310                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1311                 return NULL;
1312         }
1313         memset(rport, 0, size);
1314
1315         rport->maxframe_size = -1;
1316         rport->supported_classes = FC_COS_UNSPECIFIED;
1317         rport->dev_loss_tmo = fc_dev_loss_tmo;
1318         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1319         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1320         rport->port_id = ids->port_id;
1321         rport->roles = ids->roles;
1322         rport->port_state = FC_PORTSTATE_ONLINE;
1323         if (fci->f->dd_fcrport_size)
1324                 rport->dd_data = &rport[1];
1325         rport->channel = channel;
1326
1327         INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport);
1328         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1329
1330         spin_lock_irqsave(shost->host_lock, flags);
1331
1332         rport->number = fc_host->next_rport_number++;
1333         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1334                 rport->scsi_target_id = fc_host->next_target_id++;
1335         else
1336                 rport->scsi_target_id = -1;
1337         list_add_tail(&rport->peers, &fc_host_rports(shost));
1338         get_device(&shost->shost_gendev);
1339
1340         spin_unlock_irqrestore(shost->host_lock, flags);
1341
1342         dev = &rport->dev;
1343         device_initialize(dev);
1344         dev->parent = get_device(&shost->shost_gendev);
1345         dev->release = fc_rport_dev_release;
1346         sprintf(dev->bus_id, "rport-%d:%d-%d",
1347                 shost->host_no, channel, rport->number);
1348         transport_setup_device(dev);
1349
1350         error = device_add(dev);
1351         if (error) {
1352                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1353                 goto delete_rport;
1354         }
1355         transport_add_device(dev);
1356         transport_configure_device(dev);
1357
1358         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1359                 /* initiate a scan of the target */
1360                 scsi_queue_work(shost, &rport->scan_work);
1361
1362         return rport;
1363
1364 delete_rport:
1365         transport_destroy_device(dev);
1366         put_device(dev->parent);
1367         spin_lock_irqsave(shost->host_lock, flags);
1368         list_del(&rport->peers);
1369         put_device(&shost->shost_gendev);
1370         spin_unlock_irqrestore(shost->host_lock, flags);
1371         put_device(dev->parent);
1372         kfree(rport);
1373         return NULL;
1374 }
1375
1376 /**
1377  * fc_remote_port_add - notifies the fc transport of the existence
1378  *              of a remote FC port.
1379  * @shost:      scsi host the remote port is connected to.
1380  * @channel:    Channel on shost port connected to.
1381  * @ids:        The world wide names, fc address, and FC4 port
1382  *              roles for the remote port.
1383  *
1384  * The LLDD calls this routine to notify the transport of the existence
1385  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1386  * of the port, it's FC address (port_id), and the FC4 roles that are
1387  * active for the port.
1388  *
1389  * For ports that are FCP targets (aka scsi targets), the FC transport
1390  * maintains consistent target id bindings on behalf of the LLDD.
1391  * A consistent target id binding is an assignment of a target id to
1392  * a remote port identifier, which persists while the scsi host is
1393  * attached. The remote port can disappear, then later reappear, and
1394  * it's target id assignment remains the same. This allows for shifts
1395  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1396  * changes to the scsi subsystem which is based on scsi host number and
1397  * target id values.  Bindings are only valid during the attachment of
1398  * the scsi host. If the host detaches, then later re-attaches, target
1399  * id bindings may change.
1400  *
1401  * This routine is responsible for returning a remote port structure.
1402  * The routine will search the list of remote ports it maintains
1403  * internally on behalf of consistent target id mappings. If found, the
1404  * remote port structure will be reused. Otherwise, a new remote port
1405  * structure will be allocated.
1406  *
1407  * Whenever a remote port is allocated, a new fc_remote_port class
1408  * device is created.
1409  *
1410  * Should not be called from interrupt context.
1411  *
1412  * Notes:
1413  *      This routine assumes no locks are held on entry.
1414  **/
1415 struct fc_rport *
1416 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1417         struct fc_rport_identifiers  *ids)
1418 {
1419         struct fc_internal *fci = to_fc_internal(shost->transportt);
1420         struct fc_rport *rport;
1421         unsigned long flags;
1422         int match = 0;
1423
1424         /*
1425          * Search the list of "active" rports, for an rport that has been
1426          * deleted, but we've held off the real delete while the target
1427          * is in a "blocked" state.
1428          */
1429         spin_lock_irqsave(shost->host_lock, flags);
1430
1431         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1432
1433                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
1434                         (rport->channel == channel)) {
1435
1436                         switch (fc_host_tgtid_bind_type(shost)) {
1437                         case FC_TGTID_BIND_BY_WWPN:
1438                         case FC_TGTID_BIND_NONE:
1439                                 if (rport->port_name == ids->port_name)
1440                                         match = 1;
1441                                 break;
1442                         case FC_TGTID_BIND_BY_WWNN:
1443                                 if (rport->node_name == ids->node_name)
1444                                         match = 1;
1445                                 break;
1446                         case FC_TGTID_BIND_BY_ID:
1447                                 if (rport->port_id == ids->port_id)
1448                                         match = 1;
1449                                 break;
1450                         }
1451
1452                         if (match) {
1453                                 struct work_struct *work =
1454                                                         &rport->dev_loss_work;
1455
1456                                 memcpy(&rport->node_name, &ids->node_name,
1457                                         sizeof(rport->node_name));
1458                                 memcpy(&rport->port_name, &ids->port_name,
1459                                         sizeof(rport->port_name));
1460                                 rport->port_id = ids->port_id;
1461
1462                                 rport->port_state = FC_PORTSTATE_ONLINE;
1463                                 rport->roles = ids->roles;
1464
1465                                 spin_unlock_irqrestore(shost->host_lock, flags);
1466
1467                                 if (fci->f->dd_fcrport_size)
1468                                         memset(rport->dd_data, 0,
1469                                                 fci->f->dd_fcrport_size);
1470
1471                                 /*
1472                                  * If we were blocked, we were a target.
1473                                  * If no longer a target, we leave the timer
1474                                  * running in case the port changes roles
1475                                  * prior to the timer expiring. If the timer
1476                                  * fires, the target will be torn down.
1477                                  */
1478                                 if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
1479                                         return rport;
1480
1481                                 /* restart the target */
1482
1483                                 /*
1484                                  * Stop the target timer first. Take no action
1485                                  * on the del_timer failure as the state
1486                                  * machine state change will validate the
1487                                  * transaction.
1488                                  */
1489                                 if (!cancel_delayed_work(work))
1490                                         flush_scheduled_work();
1491
1492                                 /* initiate a scan of the target */
1493                                 scsi_queue_work(shost, &rport->scan_work);
1494
1495                                 return rport;
1496                         }
1497                 }
1498         }
1499
1500         /* Search the bindings array */
1501         if (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE) {
1502
1503                 /* search for a matching consistent binding */
1504
1505                 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1506                                         peers) {
1507                         if (rport->channel != channel)
1508                                 continue;
1509
1510                         switch (fc_host_tgtid_bind_type(shost)) {
1511                         case FC_TGTID_BIND_BY_WWPN:
1512                                 if (rport->port_name == ids->port_name)
1513                                         match = 1;
1514                                 break;
1515                         case FC_TGTID_BIND_BY_WWNN:
1516                                 if (rport->node_name == ids->node_name)
1517                                         match = 1;
1518                                 break;
1519                         case FC_TGTID_BIND_BY_ID:
1520                                 if (rport->port_id == ids->port_id)
1521                                         match = 1;
1522                                 break;
1523                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1524                                 break;
1525                         }
1526
1527                         if (match) {
1528                                 list_move_tail(&rport->peers,
1529                                         &fc_host_rports(shost));
1530                                 break;
1531                         }
1532                 }
1533
1534                 if (match) {
1535                         memcpy(&rport->node_name, &ids->node_name,
1536                                 sizeof(rport->node_name));
1537                         memcpy(&rport->port_name, &ids->port_name,
1538                                 sizeof(rport->port_name));
1539                         rport->port_id = ids->port_id;
1540                         rport->roles = ids->roles;
1541                         rport->port_state = FC_PORTSTATE_ONLINE;
1542
1543                         spin_unlock_irqrestore(shost->host_lock, flags);
1544
1545                         if (fci->f->dd_fcrport_size)
1546                                 memset(rport->dd_data, 0,
1547                                                 fci->f->dd_fcrport_size);
1548
1549                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1550                                 /* initiate a scan of the target */
1551                                 scsi_queue_work(shost, &rport->scan_work);
1552
1553                         return rport;
1554                 }
1555         }
1556
1557         spin_unlock_irqrestore(shost->host_lock, flags);
1558
1559         /* No consistent binding found - create new remote port entry */
1560         rport = fc_rport_create(shost, channel, ids);
1561
1562         return rport;
1563 }
1564 EXPORT_SYMBOL(fc_remote_port_add);
1565
1566 /*
1567  * fc_rport_terminate - this routine tears down and deallocates a remote port.
1568  * @rport:      The remote port to be terminated
1569  *
1570  * Notes:
1571  *      This routine assumes no locks are held on entry.
1572  */
1573 static void
1574 fc_rport_terminate(struct fc_rport  *rport)
1575 {
1576         struct Scsi_Host *shost = rport_to_shost(rport);
1577         struct device *dev = &rport->dev;
1578         unsigned long flags;
1579
1580         fc_rport_tgt_remove(rport);
1581
1582         transport_remove_device(dev);
1583         device_del(dev);
1584         transport_destroy_device(dev);
1585         spin_lock_irqsave(shost->host_lock, flags);
1586         list_del(&rport->peers);
1587         spin_unlock_irqrestore(shost->host_lock, flags);
1588         put_device(&shost->shost_gendev);
1589 }
1590
1591 /**
1592  * fc_remote_port_delete - notifies the fc transport that a remote
1593  *              port is no longer in existence.
1594  * @rport:      The remote port that no longer exists
1595  *
1596  * The LLDD calls this routine to notify the transport that a remote
1597  * port is no longer part of the topology. Note: Although a port
1598  * may no longer be part of the topology, it may persist in the remote
1599  * ports displayed by the fc_host. We do this under 2 conditions:
1600  * - If the port was a scsi target, we delay its deletion by "blocking" it.
1601  *   This allows the port to temporarily disappear, then reappear without
1602  *   disrupting the SCSI device tree attached to it. During the "blocked"
1603  *   period the port will still exist.
1604  * - If the port was a scsi target and disappears for longer than we
1605  *   expect, we'll delete the port and the tear down the SCSI device tree
1606  *   attached to it. However, we want to semi-persist the target id assigned
1607  *   to that port if it eventually does exist. The port structure will
1608  *   remain (although with minimal information) so that the target id
1609  *   bindings remails.
1610  *
1611  * If the remote port is not an FCP Target, it will be fully torn down
1612  * and deallocated, including the fc_remote_port class device.
1613  *
1614  * If the remote port is an FCP Target, the port will be placed in a
1615  * temporary blocked state. From the LLDD's perspective, the rport no
1616  * longer exists. From the SCSI midlayer's perspective, the SCSI target
1617  * exists, but all sdevs on it are blocked from further I/O. The following
1618  * is then expected:
1619  *   If the remote port does not return (signaled by a LLDD call to
1620  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
1621  *   scsi target is removed - killing all outstanding i/o and removing the
1622  *   scsi devices attached ot it. The port structure will be marked Not
1623  *   Present and be partially cleared, leaving only enough information to
1624  *   recognize the remote port relative to the scsi target id binding if
1625  *   it later appears.  The port will remain as long as there is a valid
1626  *   binding (e.g. until the user changes the binding type or unloads the
1627  *   scsi host with the binding).
1628  *
1629  *   If the remote port returns within the dev_loss_tmo value (and matches
1630  *   according to the target id binding type), the port structure will be
1631  *   reused. If it is no longer a SCSI target, the target will be torn
1632  *   down. If it continues to be a SCSI target, then the target will be
1633  *   unblocked (allowing i/o to be resumed), and a scan will be activated
1634  *   to ensure that all luns are detected.
1635  *
1636  * Called from normal process context only - cannot be called from interrupt.
1637  *
1638  * Notes:
1639  *      This routine assumes no locks are held on entry.
1640  **/
1641 void
1642 fc_remote_port_delete(struct fc_rport  *rport)
1643 {
1644         int timeout = rport->dev_loss_tmo;
1645
1646         /* If no scsi target id mapping, delete it */
1647         if (rport->scsi_target_id == -1) {
1648                 fc_rport_terminate(rport);
1649                 return;
1650         }
1651
1652         scsi_target_block(&rport->dev);
1653
1654         /* cap the length the devices can be blocked until they are deleted */
1655         schedule_delayed_work(&rport->dev_loss_work, timeout * HZ);
1656
1657         rport->port_state = FC_PORTSTATE_BLOCKED;
1658 }
1659 EXPORT_SYMBOL(fc_remote_port_delete);
1660
1661 /**
1662  * fc_remote_port_rolechg - notifies the fc transport that the roles
1663  *              on a remote may have changed.
1664  * @rport:      The remote port that changed.
1665  *
1666  * The LLDD calls this routine to notify the transport that the roles
1667  * on a remote port may have changed. The largest effect of this is
1668  * if a port now becomes a FCP Target, it must be allocated a
1669  * scsi target id.  If the port is no longer a FCP target, any
1670  * scsi target id value assigned to it will persist in case the
1671  * role changes back to include FCP Target. No changes in the scsi
1672  * midlayer will be invoked if the role changes (in the expectation
1673  * that the role will be resumed. If it doesn't normal error processing
1674  * will take place).
1675  *
1676  * Should not be called from interrupt context.
1677  *
1678  * Notes:
1679  *      This routine assumes no locks are held on entry.
1680  **/
1681 void
1682 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1683 {
1684         struct Scsi_Host *shost = rport_to_shost(rport);
1685         struct fc_host_attrs *fc_host =
1686                         (struct fc_host_attrs *)shost->shost_data;
1687         unsigned long flags;
1688         int create = 0;
1689
1690         spin_lock_irqsave(shost->host_lock, flags);
1691         if (roles & FC_RPORT_ROLE_FCP_TARGET) {
1692                 if (rport->scsi_target_id == -1) {
1693                         rport->scsi_target_id = fc_host->next_target_id++;
1694                         create = 1;
1695                 } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
1696                         create = 1;
1697         }
1698         spin_unlock_irqrestore(shost->host_lock, flags);
1699
1700         rport->roles = roles;
1701
1702         if (create) {
1703                 /*
1704                  * There may have been a delete timer running on the
1705                  * port. Ensure that it is cancelled as we now know
1706                  * the port is an FCP Target.
1707                  * Note: we know the rport is exists and in an online
1708                  *  state as the LLDD would not have had an rport
1709                  *  reference to pass us.
1710                  *
1711                  * Take no action on the del_timer failure as the state
1712                  * machine state change will validate the
1713                  * transaction.
1714                  */
1715                 if (!cancel_delayed_work(&rport->dev_loss_work))
1716                         flush_scheduled_work();
1717
1718                 /* initiate a scan of the target */
1719                 scsi_queue_work(shost, &rport->scan_work);
1720         }
1721 }
1722 EXPORT_SYMBOL(fc_remote_port_rolechg);
1723
1724 /**
1725  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
1726  *                       was a SCSI target (thus was blocked), and failed
1727  *                       to return in the alloted time.
1728  *
1729  * @data:       rport target that failed to reappear in the alloted time.
1730  **/
1731 static void
1732 fc_timeout_deleted_rport(void  *data)
1733 {
1734         struct fc_rport *rport = (struct fc_rport *)data;
1735         struct Scsi_Host *shost = rport_to_shost(rport);
1736         unsigned long flags;
1737
1738         spin_lock_irqsave(shost->host_lock, flags);
1739
1740         /*
1741          * If the port is ONLINE, then it came back, but was no longer an
1742          * FCP target. Thus we need to tear down the scsi_target on it.
1743          */
1744         if (rport->port_state == FC_PORTSTATE_ONLINE) {
1745                 spin_unlock_irqrestore(shost->host_lock, flags);
1746
1747                 dev_printk(KERN_ERR, &rport->dev,
1748                         "blocked FC remote port time out: removing target\n");
1749
1750                 fc_rport_tgt_remove(rport);
1751
1752                 return;
1753         }
1754
1755         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
1756                 spin_unlock_irqrestore(shost->host_lock, flags);
1757                 dev_printk(KERN_ERR, &rport->dev,
1758                         "blocked FC remote port time out: leaving target alone\n");
1759                 return;
1760         }
1761
1762         if (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE) {
1763                 spin_unlock_irqrestore(shost->host_lock, flags);
1764                 dev_printk(KERN_ERR, &rport->dev,
1765                         "blocked FC remote port time out: removing target\n");
1766                 fc_rport_terminate(rport);
1767                 return;
1768         }
1769
1770         dev_printk(KERN_ERR, &rport->dev,
1771                 "blocked FC remote port time out: removing target and "
1772                 "saving binding\n");
1773
1774         list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1775
1776         /*
1777          * Note: We do not remove or clear the hostdata area. This allows
1778          *   host-specific target data to persist along with the
1779          *   scsi_target_id. It's up to the host to manage it's hostdata area.
1780          */
1781
1782         /*
1783          * Reinitialize port attributes that may change if the port comes back.
1784          */
1785         rport->maxframe_size = -1;
1786         rport->supported_classes = FC_COS_UNSPECIFIED;
1787         rport->roles = FC_RPORT_ROLE_UNKNOWN;
1788         rport->port_state = FC_PORTSTATE_DELETED;
1789
1790         /* remove the identifiers that aren't used in the consisting binding */
1791         switch (fc_host_tgtid_bind_type(shost)) {
1792         case FC_TGTID_BIND_BY_WWPN:
1793                 rport->node_name = -1;
1794                 rport->port_id = -1;
1795                 break;
1796         case FC_TGTID_BIND_BY_WWNN:
1797                 rport->port_name = -1;
1798                 rport->port_id = -1;
1799                 break;
1800         case FC_TGTID_BIND_BY_ID:
1801                 rport->node_name = -1;
1802                 rport->port_name = -1;
1803                 break;
1804         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
1805                 break;
1806         }
1807
1808         /*
1809          * As this only occurs if the remote port (scsi target)
1810          * went away and didn't come back - we'll remove
1811          * all attached scsi devices.
1812          *
1813          * We'll schedule the shost work item to perform the actual removal
1814          * to avoid recursion in the different flush calls if we perform
1815          * the removal in each target - and there are lots of targets
1816          * whose timeouts fire at the same time.
1817          */
1818
1819         if ( !(fc_host_flags(shost) & FC_SHOST_RPORT_DEL_SCHEDULED)) {
1820                 fc_host_flags(shost) |= FC_SHOST_RPORT_DEL_SCHEDULED;
1821                 scsi_queue_work(shost, &fc_host_rport_del_work(shost));
1822         }
1823
1824         spin_unlock_irqrestore(shost->host_lock, flags);
1825 }
1826
1827 /**
1828  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1829  *
1830  * Will unblock the target (in case it went away and has now come back),
1831  * then invoke a scan.
1832  *
1833  * @data:       remote port to be scanned.
1834  **/
1835 static void
1836 fc_scsi_scan_rport(void *data)
1837 {
1838         struct fc_rport *rport = (struct fc_rport *)data;
1839
1840         scsi_target_unblock(&rport->dev);
1841         scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1842                         SCAN_WILD_CARD, 1);
1843 }
1844
1845
1846 /**
1847  * fc_shost_remove_rports - called to remove all rports that are marked
1848  *                       as in a deleted (not connected) state.
1849  *
1850  * @data:       shost whose rports are to be looked at
1851  **/
1852 static void
1853 fc_shost_remove_rports(void  *data)
1854 {
1855         struct Scsi_Host *shost = (struct Scsi_Host *)data;
1856         struct fc_rport *rport, *next_rport;
1857         unsigned long flags;
1858
1859         spin_lock_irqsave(shost->host_lock, flags);
1860         while (fc_host_flags(shost) & FC_SHOST_RPORT_DEL_SCHEDULED) {
1861
1862                 fc_host_flags(shost) &= ~FC_SHOST_RPORT_DEL_SCHEDULED;
1863
1864 restart_search:
1865                 list_for_each_entry_safe(rport, next_rport,
1866                                 &fc_host_rport_bindings(shost), peers) {
1867                         if (rport->port_state == FC_PORTSTATE_DELETED) {
1868                                 rport->port_state = FC_PORTSTATE_NOTPRESENT;
1869                                 spin_unlock_irqrestore(shost->host_lock, flags);
1870                                 fc_rport_tgt_remove(rport);
1871                                 spin_lock_irqsave(shost->host_lock, flags);
1872                                 goto restart_search;
1873                         }
1874                 }
1875
1876         }
1877         spin_unlock_irqrestore(shost->host_lock, flags);
1878 }
1879
1880
1881 MODULE_AUTHOR("Martin Hicks");
1882 MODULE_DESCRIPTION("FC Transport Attributes");
1883 MODULE_LICENSE("GPL");
1884
1885 module_init(fc_transport_init);
1886 module_exit(fc_transport_exit);