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