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