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 <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_transport.h>
  32 #include <scsi/scsi_transport_fc.h>
  33 #include "scsi_priv.h"
  34
  35 #define FC_PRINTK(x, l, f, a...)        printk(l "scsi(%d:%d:%d:%d): " f, (x)->host->host_no, (x)->channel, (x)->id, (x)->lun , ##a)
  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 };
 110 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 111 #define FC_PORTSTATE_MAX_NAMELEN        20
 112
 113
 114 /* Convert fc_tgtid_binding_type values to ascii string name */
 115 static struct {
 116         enum fc_tgtid_binding_type      value;
 117         char                            *name;
 118         int                             matchlen;
 119 } fc_tgtid_binding_type_names[] = {
 120         { FC_TGTID_BIND_NONE, "none", 4 },
 121         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 122         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 123         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 124 };
 125 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 126                 fc_tgtid_binding_type_names)
 127 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 128                 fc_tgtid_binding_type_names)
 129 #define FC_BINDTYPE_MAX_NAMELEN 30
 130
 131
 132 #define fc_bitfield_name_search(title, table)                   \
 133 static ssize_t                                                  \
 134 get_fc_##title##_names(u32 table_key, char *buf)                \
 135 {                                                               \
 136         char *prefix = "";                                      \
 137         ssize_t len = 0;                                        \
 138         int i;                                                  \
 139                                                                 \
 140         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 141                 if (table[i].value & table_key) {               \
 142                         len += sprintf(buf + len, "%s%s",       \
 143                                 prefix, table[i].name);         \
 144                         prefix = ", ";                          \
 145                 }                                               \
 146         }                                                       \
 147         len += sprintf(buf + len, "\n");                        \
 148         return len;                                             \
 149 }
 150
 151
 152 /* Convert FC_COS bit values to ascii string name */
 153 static struct {
 154         u32                     value;
 155         char                    *name;
 156 } fc_cos_names[] = {
 157         { FC_COS_CLASS1,        "Class 1" },
 158         { FC_COS_CLASS2,        "Class 2" },
 159         { FC_COS_CLASS3,        "Class 3" },
 160         { FC_COS_CLASS4,        "Class 4" },
 161         { FC_COS_CLASS6,        "Class 6" },
 162 };
 163 fc_bitfield_name_search(cos, fc_cos_names)
 164
 165
 166 /* Convert FC_PORTSPEED bit values to ascii string name */
 167 static struct {
 168         u32                     value;
 169         char                    *name;
 170 } fc_port_speed_names[] = {
 171         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 172         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 173         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 174         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 175         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 176 };
 177 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 178
 179
 180 static int
 181 show_fc_fc4s (char *buf, u8 *fc4_list)
 182 {
 183         int i, len=0;
 184
 185         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 186                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 187         len += sprintf(buf + len, "\n");
 188         return len;
 189 }
 190
 191
 192 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 193 static struct {
 194         u32                     value;
 195         char                    *name;
 196 } fc_remote_port_role_names[] = {
 197         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 198         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 199         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 200 };
 201 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 202
 203 /*
 204  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 205  */
 206 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 207 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 208 #define FC_FPORT_PORTID                 0x00000e
 209 #define FC_FABCTLR_PORTID               0x00000d
 210 #define FC_DIRSRVR_PORTID               0x00000c
 211 #define FC_TIMESRVR_PORTID              0x00000b
 212 #define FC_MGMTSRVR_PORTID              0x00000a
 213
 214
 215 static void fc_timeout_blocked_rport(void *data);
 216 static void fc_scsi_scan_rport(void *data);
 217 static void fc_rport_terminate(struct fc_rport  *rport);
 218
 219 /*
 220  * Attribute counts pre object type...
 221  * Increase these values if you add attributes
 222  */
 223 #define FC_STARGET_NUM_ATTRS    3
 224 #define FC_RPORT_NUM_ATTRS      9
 225 #define FC_HOST_NUM_ATTRS       15
 226
 227 struct fc_internal {
 228         struct scsi_transport_template t;
 229         struct fc_function_template *f;
 230
 231         /*
 232          * For attributes : each object has :
 233          *   An array of the actual attributes structures
 234          *   An array of null-terminated pointers to the attribute
 235          *     structures - used for mid-layer interaction.
 236          *
 237          * The attribute containers for the starget and host are are
 238          * part of the midlayer. As the remote port is specific to the
 239          * fc transport, we must provide the attribute container.
 240          */
 241         struct class_device_attribute private_starget_attrs[
 242                                                         FC_STARGET_NUM_ATTRS];
 243         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 244
 245         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 246         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 247
 248         struct transport_container rport_attr_cont;
 249         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 250         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 251 };
 252
 253 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 254
 255 static int fc_target_setup(struct device *dev)
 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 device *dev)
 285 {
 286         struct Scsi_Host *shost = dev_to_shost(dev);
 287
 288         /*
 289          * Set default values easily detected by the midlayer as
 290          * failure cases.  The scsi lldd is responsible for initializing
 291          * all transport attributes to valid values per host.
 292          */
 293         fc_host_node_name(shost) = -1;
 294         fc_host_port_name(shost) = -1;
 295         fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
 296         memset(fc_host_supported_fc4s(shost), 0,
 297                 sizeof(fc_host_supported_fc4s(shost)));
 298         memset(fc_host_symbolic_name(shost), 0,
 299                 sizeof(fc_host_symbolic_name(shost)));
 300         fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
 301         fc_host_maxframe_size(shost) = -1;
 302         memset(fc_host_serial_number(shost), 0,
 303                 sizeof(fc_host_serial_number(shost)));
 304
 305         fc_host_port_id(shost) = -1;
 306         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 307         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 308         memset(fc_host_active_fc4s(shost), 0,
 309                 sizeof(fc_host_active_fc4s(shost)));
 310         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 311         fc_host_fabric_name(shost) = -1;
 312
 313         fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
 314
 315         INIT_LIST_HEAD(&fc_host_rports(shost));
 316         INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
 317         fc_host_next_rport_number(shost) = 0;
 318         fc_host_next_target_id(shost) = 0;
 319
 320         return 0;
 321 }
 322
 323 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 324                                "fc_host",
 325                                fc_host_setup,
 326                                NULL,
 327                                NULL);
 328
 329 /*
 330  * Setup and Remove actions for remote ports are handled
 331  * in the service functions below.
 332  */
 333 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 334                                "fc_remote_ports",
 335                                NULL,
 336                                NULL,
 337                                NULL);
 338
 339 /*
 340  * Module Parameters
 341  */
 342
 343 /*
 344  * dev_loss_tmo: the default number of seconds that the FC transport
 345  *   should insulate the loss of a remote port.
 346  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 347  */
 348 static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
 349
 350 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 351 MODULE_PARM_DESC(dev_loss_tmo,
 352                  "Maximum number of seconds that the FC transport should"
 353                  " insulate the loss of a remote port. Once this value is"
 354                  " exceeded, the scsi target is removed. Value should be"
 355                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 356
 357
 358 static __init int fc_transport_init(void)
 359 {
 360         int error = transport_class_register(&fc_host_class);
 361         if (error)
 362                 return error;
 363         error = transport_class_register(&fc_rport_class);
 364         if (error)
 365                 return error;
 366         return transport_class_register(&fc_transport_class);
 367 }
 368
 369 static void __exit fc_transport_exit(void)
 370 {
 371         transport_class_unregister(&fc_transport_class);
 372         transport_class_unregister(&fc_rport_class);
 373         transport_class_unregister(&fc_host_class);
 374 }
 375
 376 /*
 377  * FC Remote Port Attribute Management
 378  */
 379
 380 #define fc_rport_show_function(field, format_string, sz, cast)          \
 381 static ssize_t                                                          \
 382 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 383 {                                                                       \
 384         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 385         struct Scsi_Host *shost = rport_to_shost(rport);                \
 386         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 387         if (i->f->get_rport_##field)                                    \
 388                 i->f->get_rport_##field(rport);                         \
 389         return snprintf(buf, sz, format_string, cast rport->field);     \
 390 }
 391
 392 #define fc_rport_store_function(field)                                  \
 393 static ssize_t                                                          \
 394 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 395                            size_t count)                                \
 396 {                                                                       \
 397         int val;                                                        \
 398         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 399         struct Scsi_Host *shost = rport_to_shost(rport);                \
 400         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 401         val = simple_strtoul(buf, NULL, 0);                             \
 402         i->f->set_rport_##field(rport, val);                            \
 403         return count;                                                   \
 404 }
 405
 406 #define fc_rport_rd_attr(field, format_string, sz)                      \
 407         fc_rport_show_function(field, format_string, sz, )              \
 408 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 409                          show_fc_rport_##field, NULL)
 410
 411 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 412         fc_rport_show_function(field, format_string, sz, (cast))        \
 413 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 414                           show_fc_rport_##field, NULL)
 415
 416 #define fc_rport_rw_attr(field, format_string, sz)                      \
 417         fc_rport_show_function(field, format_string, sz, )              \
 418         fc_rport_store_function(field)                                  \
 419 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 420                         show_fc_rport_##field,                          \
 421                         store_fc_rport_##field)
 422
 423
 424 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 425 static ssize_t                                                          \
 426 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 427 {                                                                       \
 428         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 429         return snprintf(buf, sz, format_string, cast rport->field);     \
 430 }
 431
 432 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 433         fc_private_rport_show_function(field, format_string, sz, )      \
 434 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 435                          show_fc_rport_##field, NULL)
 436
 437 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 438         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 439 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 440                           show_fc_rport_##field, NULL)
 441
 442
 443 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 444 static ssize_t                                                          \
 445 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 446 {                                                                       \
 447         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 448         const char *name;                                               \
 449         name = get_fc_##title##_name(rport->title);                     \
 450         if (!name)                                                      \
 451                 return -EINVAL;                                         \
 452         return snprintf(buf, maxlen, "%s\n", name);                     \
 453 }                                                                       \
 454 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 455                         show_fc_rport_##title, NULL)
 456
 457
 458 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 459         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 460         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 461         i->private_rport_attrs[count].store = NULL;                     \
 462         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 463         if (i->f->show_rport_##field)                                   \
 464                 count++
 465
 466 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 467         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 468         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 469         i->private_rport_attrs[count].store = NULL;                     \
 470         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 471         count++
 472
 473 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 474         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 475         if (!i->f->set_rport_##field) {                                 \
 476                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 477                 i->private_rport_attrs[count].store = NULL;             \
 478         }                                                               \
 479         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 480         if (i->f->show_rport_##field)                                   \
 481                 count++
 482
 483
 484 /* The FC Transport Remote Port Attributes: */
 485
 486 /* Fixed Remote Port Attributes */
 487
 488 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 489
 490 static ssize_t
 491 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 492 {
 493         struct fc_rport *rport = transport_class_to_rport(cdev);
 494         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 495                 return snprintf(buf, 20, "unspecified\n");
 496         return get_fc_cos_names(rport->supported_classes, buf);
 497 }
 498 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 499                 show_fc_rport_supported_classes, NULL);
 500
 501 /* Dynamic Remote Port Attributes */
 502
 503 fc_rport_rw_attr(dev_loss_tmo, "%d\n", 20);
 504
 505
 506 /* Private Remote Port Attributes */
 507
 508 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 509 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 510 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 511
 512 static ssize_t
 513 show_fc_rport_roles (struct class_device *cdev, char *buf)
 514 {
 515         struct fc_rport *rport = transport_class_to_rport(cdev);
 516
 517         /* identify any roles that are port_id specific */
 518         if ((rport->port_id != -1) &&
 519             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 520                                         FC_WELLKNOWN_PORTID_MASK) {
 521                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 522                 case FC_FPORT_PORTID:
 523                         return snprintf(buf, 30, "Fabric Port\n");
 524                 case FC_FABCTLR_PORTID:
 525                         return snprintf(buf, 30, "Fabric Controller\n");
 526                 case FC_DIRSRVR_PORTID:
 527                         return snprintf(buf, 30, "Directory Server\n");
 528                 case FC_TIMESRVR_PORTID:
 529                         return snprintf(buf, 30, "Time Server\n");
 530                 case FC_MGMTSRVR_PORTID:
 531                         return snprintf(buf, 30, "Management Server\n");
 532                 default:
 533                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 534                 }
 535         } else {
 536                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 537                         return snprintf(buf, 20, "unknown\n");
 538                 return get_fc_remote_port_roles_names(rport->roles, buf);
 539         }
 540 }
 541 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 542                 show_fc_rport_roles, NULL);
 543
 544 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 545 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 546
 547
 548
 549 /*
 550  * FC SCSI Target Attribute Management
 551  */
 552
 553 /*
 554  * Note: in the target show function we recognize when the remote
 555  *  port is in the heirarchy and do not allow the driver to get
 556  *  involved in sysfs functions. The driver only gets involved if
 557  *  it's the "old" style that doesn't use rports.
 558  */
 559 #define fc_starget_show_function(field, format_string, sz, cast)        \
 560 static ssize_t                                                          \
 561 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 562 {                                                                       \
 563         struct scsi_target *starget = transport_class_to_starget(cdev); \
 564         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 565         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 566         struct fc_rport *rport = starget_to_rport(starget);             \
 567         if (rport)                                                      \
 568                 fc_starget_##field(starget) = rport->field;             \
 569         else if (i->f->get_starget_##field)                             \
 570                 i->f->get_starget_##field(starget);                     \
 571         return snprintf(buf, sz, format_string,                         \
 572                 cast fc_starget_##field(starget));                      \
 573 }
 574
 575 #define fc_starget_rd_attr(field, format_string, sz)                    \
 576         fc_starget_show_function(field, format_string, sz, )            \
 577 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 578                          show_fc_starget_##field, NULL)
 579
 580 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 581         fc_starget_show_function(field, format_string, sz, (cast))      \
 582 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 583                           show_fc_starget_##field, NULL)
 584
 585 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 586         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 587         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 588         i->private_starget_attrs[count].store = NULL;                   \
 589         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 590         if (i->f->show_starget_##field)                                 \
 591                 count++
 592
 593 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 594         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 595         if (!i->f->set_starget_##field) {                               \
 596                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 597                 i->private_starget_attrs[count].store = NULL;           \
 598         }                                                               \
 599         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 600         if (i->f->show_starget_##field)                                 \
 601                 count++
 602
 603 /* The FC Transport SCSI Target Attributes: */
 604 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 605 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 606 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 607
 608
 609 /*
 610  * Host Attribute Management
 611  */
 612
 613 #define fc_host_show_function(field, format_string, sz, cast)           \
 614 static ssize_t                                                          \
 615 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 616 {                                                                       \
 617         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 618         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 619         if (i->f->get_host_##field)                                     \
 620                 i->f->get_host_##field(shost);                          \
 621         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 622 }
 623
 624 #define fc_host_store_function(field)                                   \
 625 static ssize_t                                                          \
 626 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 627                            size_t count)                                \
 628 {                                                                       \
 629         int val;                                                        \
 630         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 631         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 632                                                                         \
 633         val = simple_strtoul(buf, NULL, 0);                             \
 634         i->f->set_host_##field(shost, val);                             \
 635         return count;                                                   \
 636 }
 637
 638 #define fc_host_rd_attr(field, format_string, sz)                       \
 639         fc_host_show_function(field, format_string, sz, )               \
 640 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 641                          show_fc_host_##field, NULL)
 642
 643 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 644         fc_host_show_function(field, format_string, sz, (cast))         \
 645 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 646                           show_fc_host_##field, NULL)
 647
 648 #define fc_host_rw_attr(field, format_string, sz)                       \
 649         fc_host_show_function(field, format_string, sz, )               \
 650         fc_host_store_function(field)                                   \
 651 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 652                         show_fc_host_##field,                           \
 653                         store_fc_host_##field)
 654
 655 #define fc_host_rd_enum_attr(title, maxlen)                             \
 656 static ssize_t                                                          \
 657 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 658 {                                                                       \
 659         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 660         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 661         const char *name;                                               \
 662         if (i->f->get_host_##title)                                     \
 663                 i->f->get_host_##title(shost);                          \
 664         name = get_fc_##title##_name(fc_host_##title(shost));           \
 665         if (!name)                                                      \
 666                 return -EINVAL;                                         \
 667         return snprintf(buf, maxlen, "%s\n", name);                     \
 668 }                                                                       \
 669 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 670
 671 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 672         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 673         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 674         i->private_host_attrs[count].store = NULL;                      \
 675         i->host_attrs[count] = &i->private_host_attrs[count];           \
 676         if (i->f->show_host_##field)                                    \
 677                 count++
 678
 679 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
 680         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 681         if (!i->f->set_host_##field) {                                  \
 682                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
 683                 i->private_host_attrs[count].store = NULL;              \
 684         }                                                               \
 685         i->host_attrs[count] = &i->private_host_attrs[count];           \
 686         if (i->f->show_host_##field)                                    \
 687                 count++
 688
 689
 690 #define fc_private_host_show_function(field, format_string, sz, cast)   \
 691 static ssize_t                                                          \
 692 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 693 {                                                                       \
 694         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 695         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 696 }
 697
 698 #define fc_private_host_rd_attr(field, format_string, sz)               \
 699         fc_private_host_show_function(field, format_string, sz, )       \
 700 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 701                          show_fc_host_##field, NULL)
 702
 703 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
 704         fc_private_host_show_function(field, format_string, sz, (cast)) \
 705 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 706                           show_fc_host_##field, NULL)
 707
 708 #define SETUP_PRIVATE_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         count++
 714
 715 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
 716         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 717         i->host_attrs[count] = &i->private_host_attrs[count];           \
 718         count++
 719
 720
 721 /* Fixed Host Attributes */
 722
 723 static ssize_t
 724 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
 725 {
 726         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 727
 728         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
 729                 return snprintf(buf, 20, "unspecified\n");
 730
 731         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
 732 }
 733 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
 734                 show_fc_host_supported_classes, NULL);
 735
 736 static ssize_t
 737 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
 738 {
 739         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 740         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
 741 }
 742 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
 743                 show_fc_host_supported_fc4s, NULL);
 744
 745 static ssize_t
 746 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
 747 {
 748         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 749
 750         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
 751                 return snprintf(buf, 20, "unknown\n");
 752
 753         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
 754 }
 755 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 756                 show_fc_host_supported_speeds, NULL);
 757
 758
 759 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 760 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 761 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
 762 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 763 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
 764
 765
 766 /* Dynamic Host Attributes */
 767
 768 static ssize_t
 769 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
 770 {
 771         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 772         struct fc_internal *i = to_fc_internal(shost->transportt);
 773
 774         if (i->f->get_host_active_fc4s)
 775                 i->f->get_host_active_fc4s(shost);
 776
 777         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
 778 }
 779 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
 780                 show_fc_host_active_fc4s, NULL);
 781
 782 static ssize_t
 783 show_fc_host_speed (struct class_device *cdev, char *buf)
 784 {
 785         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 786         struct fc_internal *i = to_fc_internal(shost->transportt);
 787
 788         if (i->f->get_host_speed)
 789                 i->f->get_host_speed(shost);
 790
 791         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
 792                 return snprintf(buf, 20, "unknown\n");
 793
 794         return get_fc_port_speed_names(fc_host_speed(shost), buf);
 795 }
 796 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
 797                 show_fc_host_speed, NULL);
 798
 799
 800 fc_host_rd_attr(port_id, "0x%06x\n", 20);
 801 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
 802 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 803 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 804
 805
 806 /* Private Host Attributes */
 807
 808 static ssize_t
 809 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
 810 {
 811         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 812         const char *name;
 813
 814         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
 815         if (!name)
 816                 return -EINVAL;
 817         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 818 }
 819
 820 static ssize_t
 821 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
 822         const char *buf, size_t count)
 823 {
 824         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 825         struct fc_rport *rport, *next_rport;
 826         enum fc_tgtid_binding_type val;
 827         unsigned long flags;
 828
 829         if (get_fc_tgtid_bind_type_match(buf, &val))
 830                 return -EINVAL;
 831
 832         /* if changing bind type, purge all unused consistent bindings */
 833         if (val != fc_host_tgtid_bind_type(shost)) {
 834                 spin_lock_irqsave(shost->host_lock, flags);
 835                 list_for_each_entry_safe(rport, next_rport,
 836                                 &fc_host_rport_bindings(shost), peers)
 837                         fc_rport_terminate(rport);
 838                 spin_unlock_irqrestore(shost->host_lock, flags);
 839         }
 840
 841         fc_host_tgtid_bind_type(shost) = val;
 842         return count;
 843 }
 844
 845 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
 846                         show_fc_private_host_tgtid_bind_type,
 847                         store_fc_private_host_tgtid_bind_type);
 848
 849 /*
 850  * Host Statistics Management
 851  */
 852
 853 /* Show a given an attribute in the statistics group */
 854 static ssize_t
 855 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
 856 {
 857         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 858         struct fc_internal *i = to_fc_internal(shost->transportt);
 859         struct fc_host_statistics *stats;
 860         ssize_t ret = -ENOENT;
 861
 862         if (offset > sizeof(struct fc_host_statistics) ||
 863             offset % sizeof(u64) != 0)
 864                 WARN_ON(1);
 865
 866         if (i->f->get_fc_host_stats) {
 867                 stats = (i->f->get_fc_host_stats)(shost);
 868                 if (stats)
 869                         ret = snprintf(buf, 20, "0x%llx\n",
 870                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
 871         }
 872         return ret;
 873 }
 874
 875
 876 /* generate a read-only statistics attribute */
 877 #define fc_host_statistic(name)                                         \
 878 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
 879 {                                                                       \
 880         return fc_stat_show(cd, buf,                                    \
 881                             offsetof(struct fc_host_statistics, name)); \
 882 }                                                                       \
 883 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
 884
 885 fc_host_statistic(seconds_since_last_reset);
 886 fc_host_statistic(tx_frames);
 887 fc_host_statistic(tx_words);
 888 fc_host_statistic(rx_frames);
 889 fc_host_statistic(rx_words);
 890 fc_host_statistic(lip_count);
 891 fc_host_statistic(nos_count);
 892 fc_host_statistic(error_frames);
 893 fc_host_statistic(dumped_frames);
 894 fc_host_statistic(link_failure_count);
 895 fc_host_statistic(loss_of_sync_count);
 896 fc_host_statistic(loss_of_signal_count);
 897 fc_host_statistic(prim_seq_protocol_err_count);
 898 fc_host_statistic(invalid_tx_word_count);
 899 fc_host_statistic(invalid_crc_count);
 900 fc_host_statistic(fcp_input_requests);
 901 fc_host_statistic(fcp_output_requests);
 902 fc_host_statistic(fcp_control_requests);
 903 fc_host_statistic(fcp_input_megabytes);
 904 fc_host_statistic(fcp_output_megabytes);
 905
 906 static ssize_t
 907 fc_reset_statistics(struct class_device *cdev, const char *buf,
 908                            size_t count)
 909 {
 910         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 911         struct fc_internal *i = to_fc_internal(shost->transportt);
 912
 913         /* ignore any data value written to the attribute */
 914         if (i->f->reset_fc_host_stats) {
 915                 i->f->reset_fc_host_stats(shost);
 916                 return count;
 917         }
 918
 919         return -ENOENT;
 920 }
 921 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
 922                                 fc_reset_statistics);
 923
 924
 925 static struct attribute *fc_statistics_attrs[] = {
 926         &class_device_attr_host_seconds_since_last_reset.attr,
 927         &class_device_attr_host_tx_frames.attr,
 928         &class_device_attr_host_tx_words.attr,
 929         &class_device_attr_host_rx_frames.attr,
 930         &class_device_attr_host_rx_words.attr,
 931         &class_device_attr_host_lip_count.attr,
 932         &class_device_attr_host_nos_count.attr,
 933         &class_device_attr_host_error_frames.attr,
 934         &class_device_attr_host_dumped_frames.attr,
 935         &class_device_attr_host_link_failure_count.attr,
 936         &class_device_attr_host_loss_of_sync_count.attr,
 937         &class_device_attr_host_loss_of_signal_count.attr,
 938         &class_device_attr_host_prim_seq_protocol_err_count.attr,
 939         &class_device_attr_host_invalid_tx_word_count.attr,
 940         &class_device_attr_host_invalid_crc_count.attr,
 941         &class_device_attr_host_fcp_input_requests.attr,
 942         &class_device_attr_host_fcp_output_requests.attr,
 943         &class_device_attr_host_fcp_control_requests.attr,
 944         &class_device_attr_host_fcp_input_megabytes.attr,
 945         &class_device_attr_host_fcp_output_megabytes.attr,
 946         &class_device_attr_host_reset_statistics.attr,
 947         NULL
 948 };
 949
 950 static struct attribute_group fc_statistics_group = {
 951         .name = "statistics",
 952         .attrs = fc_statistics_attrs,
 953 };
 954
 955 static int fc_host_match(struct attribute_container *cont,
 956                           struct device *dev)
 957 {
 958         struct Scsi_Host *shost;
 959         struct fc_internal *i;
 960
 961         if (!scsi_is_host_device(dev))
 962                 return 0;
 963
 964         shost = dev_to_shost(dev);
 965         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 966             != &fc_host_class.class)
 967                 return 0;
 968
 969         i = to_fc_internal(shost->transportt);
 970
 971         return &i->t.host_attrs.ac == cont;
 972 }
 973
 974 static int fc_target_match(struct attribute_container *cont,
 975                             struct device *dev)
 976 {
 977         struct Scsi_Host *shost;
 978         struct fc_internal *i;
 979
 980         if (!scsi_is_target_device(dev))
 981                 return 0;
 982
 983         shost = dev_to_shost(dev->parent);
 984         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 985             != &fc_host_class.class)
 986                 return 0;
 987
 988         i = to_fc_internal(shost->transportt);
 989
 990         return &i->t.target_attrs.ac == cont;
 991 }
 992
 993 static void fc_rport_dev_release(struct device *dev)
 994 {
 995         struct fc_rport *rport = dev_to_rport(dev);
 996         put_device(dev->parent);
 997         kfree(rport);
 998 }
 999
1000 int scsi_is_fc_rport(const struct device *dev)
1001 {
1002         return dev->release == fc_rport_dev_release;
1003 }
1004 EXPORT_SYMBOL(scsi_is_fc_rport);
1005
1006 static int fc_rport_match(struct attribute_container *cont,
1007                             struct device *dev)
1008 {
1009         struct Scsi_Host *shost;
1010         struct fc_internal *i;
1011
1012         if (!scsi_is_fc_rport(dev))
1013                 return 0;
1014
1015         shost = dev_to_shost(dev->parent);
1016         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1017             != &fc_host_class.class)
1018                 return 0;
1019
1020         i = to_fc_internal(shost->transportt);
1021
1022         return &i->rport_attr_cont.ac == cont;
1023 }
1024
1025
1026 /*
1027  * Must be called with shost->host_lock held
1028  */
1029 static struct device *fc_target_parent(struct Scsi_Host *shost,
1030                                         int channel, uint id)
1031 {
1032         struct fc_rport *rport;
1033
1034         list_for_each_entry(rport, &fc_host_rports(shost), peers)
1035                 if ((rport->channel == channel) &&
1036                     (rport->scsi_target_id == id))
1037                         return &rport->dev;
1038
1039         return NULL;
1040 }
1041
1042 struct scsi_transport_template *
1043 fc_attach_transport(struct fc_function_template *ft)
1044 {
1045         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
1046                                         GFP_KERNEL);
1047         int count;
1048
1049         if (unlikely(!i))
1050                 return NULL;
1051
1052         memset(i, 0, sizeof(struct fc_internal));
1053
1054         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1055         i->t.target_attrs.ac.class = &fc_transport_class.class;
1056         i->t.target_attrs.ac.match = fc_target_match;
1057         i->t.target_size = sizeof(struct fc_starget_attrs);
1058         transport_container_register(&i->t.target_attrs);
1059
1060         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1061         i->t.host_attrs.ac.class = &fc_host_class.class;
1062         i->t.host_attrs.ac.match = fc_host_match;
1063         i->t.host_size = sizeof(struct fc_host_attrs);
1064         if (ft->get_fc_host_stats)
1065                 i->t.host_attrs.statistics = &fc_statistics_group;
1066         transport_container_register(&i->t.host_attrs);
1067
1068         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1069         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1070         i->rport_attr_cont.ac.match = fc_rport_match;
1071         transport_container_register(&i->rport_attr_cont);
1072
1073         i->f = ft;
1074
1075         /* Transport uses the shost workq for scsi scanning */
1076         i->t.create_work_queue = 1;
1077
1078         i->t.target_parent = fc_target_parent;
1079
1080         /*
1081          * Setup SCSI Target Attributes.
1082          */
1083         count = 0;
1084         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1085         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1086         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1087
1088         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1089
1090         i->starget_attrs[count] = NULL;
1091
1092
1093         /*
1094          * Setup SCSI Host Attributes.
1095          */
1096         count=0;
1097         SETUP_HOST_ATTRIBUTE_RD(node_name);
1098         SETUP_HOST_ATTRIBUTE_RD(port_name);
1099         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1100         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1101         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1102         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1103         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1104         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1105
1106         SETUP_HOST_ATTRIBUTE_RD(port_id);
1107         SETUP_HOST_ATTRIBUTE_RD(port_type);
1108         SETUP_HOST_ATTRIBUTE_RD(port_state);
1109         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1110         SETUP_HOST_ATTRIBUTE_RD(speed);
1111         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1112
1113         /* Transport-managed attributes */
1114         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1115
1116         BUG_ON(count > FC_HOST_NUM_ATTRS);
1117
1118         i->host_attrs[count] = NULL;
1119
1120         /*
1121          * Setup Remote Port Attributes.
1122          */
1123         count=0;
1124         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1125         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1126         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1127         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1128         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1129         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1130         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1131         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1132         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1133
1134         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1135
1136         i->rport_attrs[count] = NULL;
1137
1138         return &i->t;
1139 }
1140 EXPORT_SYMBOL(fc_attach_transport);
1141
1142 void fc_release_transport(struct scsi_transport_template *t)
1143 {
1144         struct fc_internal *i = to_fc_internal(t);
1145
1146         transport_container_unregister(&i->t.target_attrs);
1147         transport_container_unregister(&i->t.host_attrs);
1148         transport_container_unregister(&i->rport_attr_cont);
1149
1150         kfree(i);
1151 }
1152 EXPORT_SYMBOL(fc_release_transport);
1153
1154
1155 /**
1156  * fc_remove_host - called to terminate any fc_transport-related elements
1157  *                  for a scsi host.
1158  * @rport:      remote port to be unblocked.
1159  *
1160  * This routine is expected to be called immediately preceeding the
1161  * a driver's call to scsi_remove_host().
1162  *
1163  * WARNING: A driver utilizing the fc_transport, which fails to call
1164  *   this routine prior to scsi_remote_host(), will leave dangling
1165  *   objects in /sys/class/fc_remote_ports. Access to any of these
1166  *   objects can result in a system crash !!!
1167  *
1168  * Notes:
1169  *      This routine assumes no locks are held on entry.
1170  **/
1171 void
1172 fc_remove_host(struct Scsi_Host *shost)
1173 {
1174         struct fc_rport *rport, *next_rport;
1175
1176         /* Remove any remote ports */
1177         list_for_each_entry_safe(rport, next_rport,
1178                         &fc_host_rports(shost), peers)
1179                 fc_rport_terminate(rport);
1180         list_for_each_entry_safe(rport, next_rport,
1181                         &fc_host_rport_bindings(shost), peers)
1182                 fc_rport_terminate(rport);
1183 }
1184 EXPORT_SYMBOL(fc_remove_host);
1185
1186 /**
1187  * fc_rport_create - allocates and creates a remote FC port.
1188  * @shost:      scsi host the remote port is connected to.
1189  * @channel:    Channel on shost port connected to.
1190  * @ids:        The world wide names, fc address, and FC4 port
1191  *              roles for the remote port.
1192  *
1193  * Allocates and creates the remoter port structure, including the
1194  * class and sysfs creation.
1195  *
1196  * Notes:
1197  *      This routine assumes no locks are held on entry.
1198  **/
1199 struct fc_rport *
1200 fc_rport_create(struct Scsi_Host *shost, int channel,
1201         struct fc_rport_identifiers  *ids)
1202 {
1203         struct fc_host_attrs *fc_host =
1204                         (struct fc_host_attrs *)shost->shost_data;
1205         struct fc_internal *fci = to_fc_internal(shost->transportt);
1206         struct fc_rport *rport;
1207         struct device *dev;
1208         unsigned long flags;
1209         int error;
1210         size_t size;
1211
1212         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1213         rport = kmalloc(size, GFP_KERNEL);
1214         if (unlikely(!rport)) {
1215                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1216                 return NULL;
1217         }
1218         memset(rport, 0, size);
1219
1220         rport->maxframe_size = -1;
1221         rport->supported_classes = FC_COS_UNSPECIFIED;
1222         rport->dev_loss_tmo = fc_dev_loss_tmo;
1223         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1224         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1225         rport->port_id = ids->port_id;
1226         rport->roles = ids->roles;
1227         rport->port_state = FC_PORTSTATE_ONLINE;
1228         if (fci->f->dd_fcrport_size)
1229                 rport->dd_data = &rport[1];
1230         rport->channel = channel;
1231
1232         INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport);
1233         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1234
1235         spin_lock_irqsave(shost->host_lock, flags);
1236
1237         rport->number = fc_host->next_rport_number++;
1238         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1239                 rport->scsi_target_id = fc_host->next_target_id++;
1240         else
1241                 rport->scsi_target_id = -1;
1242         list_add_tail(&rport->peers, &fc_host_rports(shost));
1243         get_device(&shost->shost_gendev);
1244
1245         spin_unlock_irqrestore(shost->host_lock, flags);
1246
1247         dev = &rport->dev;
1248         device_initialize(dev);
1249         dev->parent = get_device(&shost->shost_gendev);
1250         dev->release = fc_rport_dev_release;
1251         sprintf(dev->bus_id, "rport-%d:%d-%d",
1252                 shost->host_no, channel, rport->number);
1253         transport_setup_device(dev);
1254
1255         error = device_add(dev);
1256         if (error) {
1257                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1258                 goto delete_rport;
1259         }
1260         transport_add_device(dev);
1261         transport_configure_device(dev);
1262
1263         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1264                 /* initiate a scan of the target */
1265                 scsi_queue_work(shost, &rport->scan_work);
1266
1267         return rport;
1268
1269 delete_rport:
1270         transport_destroy_device(dev);
1271         put_device(dev->parent);
1272         spin_lock_irqsave(shost->host_lock, flags);
1273         list_del(&rport->peers);
1274         put_device(&shost->shost_gendev);
1275         spin_unlock_irqrestore(shost->host_lock, flags);
1276         put_device(dev->parent);
1277         kfree(rport);
1278         return NULL;
1279 }
1280
1281 /**
1282  * fc_remote_port_add - notifies the fc transport of the existence
1283  *              of a remote FC port.
1284  * @shost:      scsi host the remote port is connected to.
1285  * @channel:    Channel on shost port connected to.
1286  * @ids:        The world wide names, fc address, and FC4 port
1287  *              roles for the remote port.
1288  *
1289  * The LLDD calls this routine to notify the transport of the existence
1290  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1291  * of the port, it's FC address (port_id), and the FC4 roles that are
1292  * active for the port.
1293  *
1294  * For ports that are FCP targets (aka scsi targets), the FC transport
1295  * maintains consistent target id bindings on behalf of the LLDD.
1296  * A consistent target id binding is an assignment of a target id to
1297  * a remote port identifier, which persists while the scsi host is
1298  * attached. The remote port can disappear, then later reappear, and
1299  * it's target id assignment remains the same. This allows for shifts
1300  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1301  * changes to the scsi subsystem which is based on scsi host number and
1302  * target id values.  Bindings are only valid during the attachment of
1303  * the scsi host. If the host detaches, then later re-attaches, target
1304  * id bindings may change.
1305  *
1306  * This routine is responsible for returning a remote port structure.
1307  * The routine will search the list of remote ports it maintains
1308  * internally on behalf of consistent target id mappings. If found, the
1309  * remote port structure will be reused. Otherwise, a new remote port
1310  * structure will be allocated.
1311  *
1312  * Whenever a remote port is allocated, a new fc_remote_port class
1313  * device is created.
1314  *
1315  * Should not be called from interrupt context.
1316  *
1317  * Notes:
1318  *      This routine assumes no locks are held on entry.
1319  **/
1320 struct fc_rport *
1321 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1322         struct fc_rport_identifiers  *ids)
1323 {
1324         struct fc_rport *rport;
1325         unsigned long flags;
1326         int match = 0;
1327
1328         if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) &&
1329                 (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) {
1330
1331                 /* search for a matching consistent binding */
1332
1333                 spin_lock_irqsave(shost->host_lock, flags);
1334
1335                 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1336                                         peers) {
1337                         if (rport->channel != channel)
1338                                 continue;
1339
1340                         switch (fc_host_tgtid_bind_type(shost)) {
1341                         case FC_TGTID_BIND_BY_WWPN:
1342                                 if (rport->port_name == ids->port_name)
1343                                         match = 1;
1344                                 break;
1345                         case FC_TGTID_BIND_BY_WWNN:
1346                                 if (rport->node_name == ids->node_name)
1347                                         match = 1;
1348                                 break;
1349                         case FC_TGTID_BIND_BY_ID:
1350                                 if (rport->port_id == ids->port_id)
1351                                         match = 1;
1352                                 break;
1353                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1354                                 break;
1355                         }
1356
1357                         if (match) {
1358                                 list_move_tail(&rport->peers,
1359                                         &fc_host_rports(shost));
1360                                 break;
1361                         }
1362                 }
1363
1364                 spin_unlock_irqrestore(shost->host_lock, flags);
1365
1366                 if (match) {
1367                         memcpy(&rport->node_name, &ids->node_name,
1368                                 sizeof(rport->node_name));
1369                         memcpy(&rport->port_name, &ids->port_name,
1370                                 sizeof(rport->port_name));
1371                         rport->port_id = ids->port_id;
1372                         rport->roles = ids->roles;
1373                         rport->port_state = FC_PORTSTATE_ONLINE;
1374
1375                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1376                                 /* initiate a scan of the target */
1377                                 scsi_queue_work(shost, &rport->scan_work);
1378
1379                         return rport;
1380                 }
1381         }
1382
1383         /* No consistent binding found - create new remote port entry */
1384         rport = fc_rport_create(shost, channel, ids);
1385
1386         return rport;
1387 }
1388 EXPORT_SYMBOL(fc_remote_port_add);
1389
1390 /*
1391  * fc_rport_tgt_remove - Removes the scsi target on the remote port
1392  * @rport:      The remote port to be operated on
1393  */
1394 static void
1395 fc_rport_tgt_remove(struct fc_rport *rport)
1396 {
1397         struct Scsi_Host *shost = rport_to_shost(rport);
1398
1399         scsi_target_unblock(&rport->dev);
1400
1401         /* Stop anything on the workq */
1402         if (!cancel_delayed_work(&rport->dev_loss_work))
1403                 flush_scheduled_work();
1404         scsi_flush_work(shost);
1405
1406         scsi_remove_target(&rport->dev);
1407 }
1408
1409 /*
1410  * fc_rport_terminate - this routine tears down and deallocates a remote port.
1411  * @rport:      The remote port to be terminated
1412  *
1413  * Notes:
1414  *      This routine assumes no locks are held on entry.
1415  */
1416 static void
1417 fc_rport_terminate(struct fc_rport  *rport)
1418 {
1419         struct Scsi_Host *shost = rport_to_shost(rport);
1420         struct device *dev = &rport->dev;
1421         unsigned long flags;
1422
1423         fc_rport_tgt_remove(rport);
1424
1425         transport_remove_device(dev);
1426         device_del(dev);
1427         transport_destroy_device(dev);
1428         spin_lock_irqsave(shost->host_lock, flags);
1429         list_del(&rport->peers);
1430         spin_unlock_irqrestore(shost->host_lock, flags);
1431         put_device(&shost->shost_gendev);
1432 }
1433
1434 /**
1435  * fc_remote_port_delete - notifies the fc transport that a remote
1436  *              port is no longer in existence.
1437  * @rport:      The remote port that no longer exists
1438  *
1439  * The LLDD calls this routine to notify the transport that a remote
1440  * port is no longer part of the topology. Note: Although a port
1441  * may no longer be part of the topology, it may persist in the remote
1442  * ports displayed by the fc_host. This is done so that target id
1443  * mappings (managed via the remote port structures), are always visible
1444  * as long as the mapping is valid, regardless of port state,
1445  *
1446  * If the remote port is not an FCP Target, it will be fully torn down
1447  * and deallocated, including the fc_remote_port class device.
1448  *
1449  * If the remote port is an FCP Target, the port structure will be
1450  * marked as Not Present, but will remain as long as there is a valid
1451  * SCSI target id mapping associated with the port structure. Validity
1452  * is determined by the binding type. If binding by wwpn, then the port
1453  * structure is always valid and will not be deallocated until the host
1454  * is removed.  If binding by wwnn, then the port structure is valid
1455  * until another port with the same node name is found in the topology.
1456  * If binding by port id (fc address), then the port structure is valid
1457  * valid until another port with the same address is identified.
1458  *
1459  * Called from interrupt or normal process context.
1460  *
1461  * Notes:
1462  *      This routine assumes no locks are held on entry.
1463  **/
1464 void
1465 fc_remote_port_delete(struct fc_rport  *rport)
1466 {
1467         struct Scsi_Host *shost = rport_to_shost(rport);
1468         unsigned long flags;
1469
1470         /* If no scsi target id mapping or consistent binding type, delete it */
1471         if ((rport->scsi_target_id == -1) ||
1472             (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) {
1473                 fc_rport_terminate(rport);
1474                 return;
1475         }
1476
1477         fc_rport_tgt_remove(rport);
1478
1479         spin_lock_irqsave(shost->host_lock, flags);
1480         list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1481         spin_unlock_irqrestore(shost->host_lock, flags);
1482
1483         /*
1484          * Note: We do not remove or clear the hostdata area. This allows
1485          *   host-specific target data to persist along with the
1486          *   scsi_target_id. It's up to the host to manage it's hostdata area.
1487          */
1488
1489         /*
1490          * Reinitialize port attributes that may change if the port comes back.
1491          */
1492         rport->maxframe_size = -1;
1493         rport->supported_classes = FC_COS_UNSPECIFIED;
1494         rport->roles = FC_RPORT_ROLE_UNKNOWN;
1495         rport->port_state = FC_PORTSTATE_NOTPRESENT;
1496
1497         /* remove the identifiers that aren't used in the consisting binding */
1498         switch (fc_host_tgtid_bind_type(shost)) {
1499         case FC_TGTID_BIND_BY_WWPN:
1500                 rport->node_name = -1;
1501                 rport->port_id = -1;
1502                 break;
1503         case FC_TGTID_BIND_BY_WWNN:
1504                 rport->port_name = -1;
1505                 rport->port_id = -1;
1506                 break;
1507         case FC_TGTID_BIND_BY_ID:
1508                 rport->node_name = -1;
1509                 rport->port_name = -1;
1510                 break;
1511         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
1512                 break;
1513         }
1514 }
1515 EXPORT_SYMBOL(fc_remote_port_delete);
1516
1517 /**
1518  * fc_remote_port_rolechg - notifies the fc transport that the roles
1519  *              on a remote may have changed.
1520  * @rport:      The remote port that changed.
1521  *
1522  * The LLDD calls this routine to notify the transport that the roles
1523  * on a remote port may have changed. The largest effect of this is
1524  * if a port now becomes a FCP Target, it must be allocated a
1525  * scsi target id.  If the port is no longer a FCP target, any
1526  * scsi target id value assigned to it will persist in case the
1527  * role changes back to include FCP Target. No changes in the scsi
1528  * midlayer will be invoked if the role changes (in the expectation
1529  * that the role will be resumed. If it doesn't normal error processing
1530  * will take place).
1531  *
1532  * Should not be called from interrupt context.
1533  *
1534  * Notes:
1535  *      This routine assumes no locks are held on entry.
1536  **/
1537 void
1538 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1539 {
1540         struct Scsi_Host *shost = rport_to_shost(rport);
1541         struct fc_host_attrs *fc_host =
1542                         (struct fc_host_attrs *)shost->shost_data;
1543         unsigned long flags;
1544         int create = 0;
1545
1546         rport->roles = roles;
1547
1548         spin_lock_irqsave(shost->host_lock, flags);
1549         if ((rport->scsi_target_id == -1) &&
1550             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
1551                 rport->scsi_target_id = fc_host->next_target_id++;
1552                 create = 1;
1553         }
1554         spin_unlock_irqrestore(shost->host_lock, flags);
1555
1556         if (create)
1557                 /* initiate a scan of the target */
1558                 scsi_queue_work(shost, &rport->scan_work);
1559 }
1560 EXPORT_SYMBOL(fc_remote_port_rolechg);
1561
1562 /**
1563  * fc_timeout_blocked_rport - Timeout handler for blocked remote port
1564  *                       that fails to return in the alloted time.
1565  * @data:       scsi target that failed to reappear in the alloted time.
1566  **/
1567 static void
1568 fc_timeout_blocked_rport(void  *data)
1569 {
1570         struct fc_rport *rport = (struct fc_rport *)data;
1571
1572         rport->port_state = FC_PORTSTATE_OFFLINE;
1573
1574         dev_printk(KERN_ERR, &rport->dev,
1575                 "blocked FC remote port time out: removing target\n");
1576
1577         /*
1578          * As this only occurs if the remote port (scsi target)
1579          * went away and didn't come back - we'll remove
1580          * all attached scsi devices.
1581          */
1582         scsi_target_unblock(&rport->dev);
1583         scsi_remove_target(&rport->dev);
1584 }
1585
1586 /**
1587  * fc_remote_port_block - temporarily block any scsi traffic to a remote port.
1588  * @rport:      remote port to be blocked.
1589  *
1590  * scsi lldd's with a FC transport call this routine to temporarily stop
1591  * all scsi traffic to a remote port. If the port is not a SCSI target,
1592  * no action is taken. If the port is a SCSI target, all attached devices
1593  * are placed into a SDEV_BLOCK state and a timer is started. The timer is
1594  * represents the maximum amount of time the port may be blocked. If the
1595  * timer expires, the port is considered non-existent and the attached
1596  * scsi devices will be removed.
1597  *
1598  * Called from interrupt or normal process context.
1599  *
1600  * Returns zero if successful or error if not
1601  *
1602  * Notes:
1603  *      This routine assumes no locks are held on entry.
1604  *
1605  *      The timeout and timer types are extracted from the fc transport
1606  *      attributes from the caller's rport pointer.
1607  **/
1608 int
1609 fc_remote_port_block(struct fc_rport *rport)
1610 {
1611         int timeout = rport->dev_loss_tmo;
1612         struct work_struct *work = &rport->dev_loss_work;
1613
1614         if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1615                 return -EINVAL;
1616
1617         scsi_target_block(&rport->dev);
1618
1619         /* cap the length the devices can be blocked */
1620         schedule_delayed_work(work, timeout * HZ);
1621
1622         rport->port_state = FC_PORTSTATE_BLOCKED;
1623         return 0;
1624 }
1625 EXPORT_SYMBOL(fc_remote_port_block);
1626
1627 /**
1628  * fc_remote_port_unblock - restart any blocked scsi traffic to a remote port.
1629  * @rport:      remote port to be unblocked.
1630  *
1631  * scsi lld's with a FC transport call this routine to restart IO to all
1632  * devices associated with the caller's scsi target following a fc_target_block
1633  * request.  Called from interrupt or normal process context.
1634  *
1635  * Notes:
1636  *      This routine assumes no locks are held on entry.
1637  **/
1638  void
1639 fc_remote_port_unblock(struct fc_rport *rport)
1640 {
1641         struct work_struct *work = &rport->dev_loss_work;
1642         struct Scsi_Host *shost = rport_to_shost(rport);
1643
1644         /*
1645          * Stop the target timer first. Take no action on the del_timer
1646          * failure as the state machine state change will validate the
1647          * transaction.
1648          */
1649         if (!cancel_delayed_work(work))
1650                 flush_scheduled_work();
1651
1652         if (rport->port_state == FC_PORTSTATE_OFFLINE)
1653                 /*
1654                  * initiate a scan of the target as the target has
1655                  * been torn down.
1656                  */
1657                 scsi_queue_work(shost, &rport->scan_work);
1658         else
1659                 scsi_target_unblock(&rport->dev);
1660
1661         rport->port_state = FC_PORTSTATE_ONLINE;
1662 }
1663 EXPORT_SYMBOL(fc_remote_port_unblock);
1664
1665 /**
1666  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1667  * @data:       remote port to be scanned.
1668  **/
1669 static void
1670 fc_scsi_scan_rport(void *data)
1671 {
1672         struct fc_rport *rport = (struct fc_rport *)data;
1673
1674         scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1675                         SCAN_WILD_CARD, 1);
1676 }
1677
1678
1679 MODULE_AUTHOR("Martin Hicks");
1680 MODULE_DESCRIPTION("FC Transport Attributes");
1681 MODULE_LICENSE("GPL");
1682
1683 module_init(fc_transport_init);
1684 module_exit(fc_transport_exit);