drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/sched.h>        /* workqueue stuff, HZ */
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include "scsi_priv.h"
  35
  36 #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)
  37
  38 /*
  39  * Redefine so that we can have same named attributes in the
  40  * sdev/starget/host objects.
  41  */
  42 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  43 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  44         __ATTR(_name,_mode,_show,_store)
  45
  46 #define fc_enum_name_search(title, table_type, table)                   \
  47 static const char *get_fc_##title##_name(enum table_type table_key)     \
  48 {                                                                       \
  49         int i;                                                          \
  50         char *name = NULL;                                              \
  51                                                                         \
  52         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
  53                 if (table[i].value == table_key) {                      \
  54                         name = table[i].name;                           \
  55                         break;                                          \
  56                 }                                                       \
  57         }                                                               \
  58         return name;                                                    \
  59 }
  60
  61 #define fc_enum_name_match(title, table_type, table)                    \
  62 static int get_fc_##title##_match(const char *table_key,                \
  63                 enum table_type *value)                                 \
  64 {                                                                       \
  65         int i;                                                          \
  66                                                                         \
  67         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
  68                 if (strncmp(table_key, table[i].name,                   \
  69                                 table[i].matchlen) == 0) {              \
  70                         *value = table[i].value;                        \
  71                         return 0; /* success */                         \
  72                 }                                                       \
  73         }                                                               \
  74         return 1; /* failure */                                         \
  75 }
  76
  77
  78 /* Convert fc_port_type values to ascii string name */
  79 static struct {
  80         enum fc_port_type       value;
  81         char                    *name;
  82 } fc_port_type_names[] = {
  83         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  84         { FC_PORTTYPE_OTHER,            "Other" },
  85         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  86         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  87         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  88         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  89         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  90 };
  91 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  92 #define FC_PORTTYPE_MAX_NAMELEN         50
  93
  94
  95 /* Convert fc_port_state values to ascii string name */
  96 static struct {
  97         enum fc_port_state      value;
  98         char                    *name;
  99 } fc_port_state_names[] = {
 100         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 101         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 102         { FC_PORTSTATE_ONLINE,          "Online" },
 103         { FC_PORTSTATE_OFFLINE,         "Offline" },
 104         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 105         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 106         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 107         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 108         { FC_PORTSTATE_ERROR,           "Error" },
 109         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 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 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 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 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 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_timeout_blocked_rport(void *data);
 217 static void fc_scsi_scan_rport(void *data);
 218 static void fc_rport_terminate(struct fc_rport  *rport);
 219
 220 /*
 221  * Attribute counts pre object type...
 222  * Increase these values if you add attributes
 223  */
 224 #define FC_STARGET_NUM_ATTRS    3
 225 #define FC_RPORT_NUM_ATTRS      9
 226 #define FC_HOST_NUM_ATTRS       15
 227
 228 struct fc_internal {
 229         struct scsi_transport_template t;
 230         struct fc_function_template *f;
 231
 232         /*
 233          * For attributes : each object has :
 234          *   An array of the actual attributes structures
 235          *   An array of null-terminated pointers to the attribute
 236          *     structures - used for mid-layer interaction.
 237          *
 238          * The attribute containers for the starget and host are are
 239          * part of the midlayer. As the remote port is specific to the
 240          * fc transport, we must provide the attribute container.
 241          */
 242         struct class_device_attribute private_starget_attrs[
 243                                                         FC_STARGET_NUM_ATTRS];
 244         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 245
 246         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 247         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 248
 249         struct transport_container rport_attr_cont;
 250         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 251         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 252 };
 253
 254 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 255
 256 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 257                            struct class_device *cdev)
 258 {
 259         struct scsi_target *starget = to_scsi_target(dev);
 260         struct fc_rport *rport = starget_to_rport(starget);
 261
 262         /*
 263          * if parent is remote port, use values from remote port.
 264          * Otherwise, this host uses the fc_transport, but not the
 265          * remote port interface. As such, initialize to known non-values.
 266          */
 267         if (rport) {
 268                 fc_starget_node_name(starget) = rport->node_name;
 269                 fc_starget_port_name(starget) = rport->port_name;
 270                 fc_starget_port_id(starget) = rport->port_id;
 271         } else {
 272                 fc_starget_node_name(starget) = -1;
 273                 fc_starget_port_name(starget) = -1;
 274                 fc_starget_port_id(starget) = -1;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 281                                "fc_transport",
 282                                fc_target_setup,
 283                                NULL,
 284                                NULL);
 285
 286 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 287                          struct class_device *cdev)
 288 {
 289         struct Scsi_Host *shost = dev_to_shost(dev);
 290
 291         /*
 292          * Set default values easily detected by the midlayer as
 293          * failure cases.  The scsi lldd is responsible for initializing
 294          * all transport attributes to valid values per host.
 295          */
 296         fc_host_node_name(shost) = -1;
 297         fc_host_port_name(shost) = -1;
 298         fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
 299         memset(fc_host_supported_fc4s(shost), 0,
 300                 sizeof(fc_host_supported_fc4s(shost)));
 301         memset(fc_host_symbolic_name(shost), 0,
 302                 sizeof(fc_host_symbolic_name(shost)));
 303         fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
 304         fc_host_maxframe_size(shost) = -1;
 305         memset(fc_host_serial_number(shost), 0,
 306                 sizeof(fc_host_serial_number(shost)));
 307
 308         fc_host_port_id(shost) = -1;
 309         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 310         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 311         memset(fc_host_active_fc4s(shost), 0,
 312                 sizeof(fc_host_active_fc4s(shost)));
 313         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 314         fc_host_fabric_name(shost) = -1;
 315
 316         fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
 317
 318         INIT_LIST_HEAD(&fc_host_rports(shost));
 319         INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
 320         fc_host_next_rport_number(shost) = 0;
 321         fc_host_next_target_id(shost) = 0;
 322
 323         return 0;
 324 }
 325
 326 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 327                                "fc_host",
 328                                fc_host_setup,
 329                                NULL,
 330                                NULL);
 331
 332 /*
 333  * Setup and Remove actions for remote ports are handled
 334  * in the service functions below.
 335  */
 336 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 337                                "fc_remote_ports",
 338                                NULL,
 339                                NULL,
 340                                NULL);
 341
 342 /*
 343  * Module Parameters
 344  */
 345
 346 /*
 347  * dev_loss_tmo: the default number of seconds that the FC transport
 348  *   should insulate the loss of a remote port.
 349  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 350  */
 351 static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
 352
 353 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 354 MODULE_PARM_DESC(dev_loss_tmo,
 355                  "Maximum number of seconds that the FC transport should"
 356                  " insulate the loss of a remote port. Once this value is"
 357                  " exceeded, the scsi target is removed. Value should be"
 358                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 359
 360
 361 static __init int fc_transport_init(void)
 362 {
 363         int error = transport_class_register(&fc_host_class);
 364         if (error)
 365                 return error;
 366         error = transport_class_register(&fc_rport_class);
 367         if (error)
 368                 return error;
 369         return transport_class_register(&fc_transport_class);
 370 }
 371
 372 static void __exit fc_transport_exit(void)
 373 {
 374         transport_class_unregister(&fc_transport_class);
 375         transport_class_unregister(&fc_rport_class);
 376         transport_class_unregister(&fc_host_class);
 377 }
 378
 379 /*
 380  * FC Remote Port Attribute Management
 381  */
 382
 383 #define fc_rport_show_function(field, format_string, sz, cast)          \
 384 static ssize_t                                                          \
 385 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 386 {                                                                       \
 387         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 388         struct Scsi_Host *shost = rport_to_shost(rport);                \
 389         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 390         if (i->f->get_rport_##field)                                    \
 391                 i->f->get_rport_##field(rport);                         \
 392         return snprintf(buf, sz, format_string, cast rport->field);     \
 393 }
 394
 395 #define fc_rport_store_function(field)                                  \
 396 static ssize_t                                                          \
 397 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 398                            size_t count)                                \
 399 {                                                                       \
 400         int val;                                                        \
 401         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 402         struct Scsi_Host *shost = rport_to_shost(rport);                \
 403         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 404         val = simple_strtoul(buf, NULL, 0);                             \
 405         i->f->set_rport_##field(rport, val);                            \
 406         return count;                                                   \
 407 }
 408
 409 #define fc_rport_rd_attr(field, format_string, sz)                      \
 410         fc_rport_show_function(field, format_string, sz, )              \
 411 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 412                          show_fc_rport_##field, NULL)
 413
 414 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 415         fc_rport_show_function(field, format_string, sz, (cast))        \
 416 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 417                           show_fc_rport_##field, NULL)
 418
 419 #define fc_rport_rw_attr(field, format_string, sz)                      \
 420         fc_rport_show_function(field, format_string, sz, )              \
 421         fc_rport_store_function(field)                                  \
 422 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 423                         show_fc_rport_##field,                          \
 424                         store_fc_rport_##field)
 425
 426
 427 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 428 static ssize_t                                                          \
 429 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 430 {                                                                       \
 431         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 432         return snprintf(buf, sz, format_string, cast rport->field);     \
 433 }
 434
 435 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 436         fc_private_rport_show_function(field, format_string, sz, )      \
 437 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 438                          show_fc_rport_##field, NULL)
 439
 440 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 441         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 442 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 443                           show_fc_rport_##field, NULL)
 444
 445
 446 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 447 static ssize_t                                                          \
 448 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 449 {                                                                       \
 450         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 451         const char *name;                                               \
 452         name = get_fc_##title##_name(rport->title);                     \
 453         if (!name)                                                      \
 454                 return -EINVAL;                                         \
 455         return snprintf(buf, maxlen, "%s\n", name);                     \
 456 }                                                                       \
 457 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 458                         show_fc_rport_##title, NULL)
 459
 460
 461 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 462         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 463         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 464         i->private_rport_attrs[count].store = NULL;                     \
 465         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 466         if (i->f->show_rport_##field)                                   \
 467                 count++
 468
 469 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 470         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 471         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 472         i->private_rport_attrs[count].store = NULL;                     \
 473         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 474         count++
 475
 476 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 477         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 478         if (!i->f->set_rport_##field) {                                 \
 479                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 480                 i->private_rport_attrs[count].store = NULL;             \
 481         }                                                               \
 482         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 483         if (i->f->show_rport_##field)                                   \
 484                 count++
 485
 486
 487 /* The FC Transport Remote Port Attributes: */
 488
 489 /* Fixed Remote Port Attributes */
 490
 491 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 492
 493 static ssize_t
 494 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 495 {
 496         struct fc_rport *rport = transport_class_to_rport(cdev);
 497         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 498                 return snprintf(buf, 20, "unspecified\n");
 499         return get_fc_cos_names(rport->supported_classes, buf);
 500 }
 501 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 502                 show_fc_rport_supported_classes, NULL);
 503
 504 /* Dynamic Remote Port Attributes */
 505
 506 fc_rport_rw_attr(dev_loss_tmo, "%d\n", 20);
 507
 508
 509 /* Private Remote Port Attributes */
 510
 511 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 512 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 513 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 514
 515 static ssize_t
 516 show_fc_rport_roles (struct class_device *cdev, char *buf)
 517 {
 518         struct fc_rport *rport = transport_class_to_rport(cdev);
 519
 520         /* identify any roles that are port_id specific */
 521         if ((rport->port_id != -1) &&
 522             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 523                                         FC_WELLKNOWN_PORTID_MASK) {
 524                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 525                 case FC_FPORT_PORTID:
 526                         return snprintf(buf, 30, "Fabric Port\n");
 527                 case FC_FABCTLR_PORTID:
 528                         return snprintf(buf, 30, "Fabric Controller\n");
 529                 case FC_DIRSRVR_PORTID:
 530                         return snprintf(buf, 30, "Directory Server\n");
 531                 case FC_TIMESRVR_PORTID:
 532                         return snprintf(buf, 30, "Time Server\n");
 533                 case FC_MGMTSRVR_PORTID:
 534                         return snprintf(buf, 30, "Management Server\n");
 535                 default:
 536                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 537                 }
 538         } else {
 539                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 540                         return snprintf(buf, 20, "unknown\n");
 541                 return get_fc_remote_port_roles_names(rport->roles, buf);
 542         }
 543 }
 544 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 545                 show_fc_rport_roles, NULL);
 546
 547 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 548 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 549
 550
 551
 552 /*
 553  * FC SCSI Target Attribute Management
 554  */
 555
 556 /*
 557  * Note: in the target show function we recognize when the remote
 558  *  port is in the heirarchy and do not allow the driver to get
 559  *  involved in sysfs functions. The driver only gets involved if
 560  *  it's the "old" style that doesn't use rports.
 561  */
 562 #define fc_starget_show_function(field, format_string, sz, cast)        \
 563 static ssize_t                                                          \
 564 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 565 {                                                                       \
 566         struct scsi_target *starget = transport_class_to_starget(cdev); \
 567         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 568         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 569         struct fc_rport *rport = starget_to_rport(starget);             \
 570         if (rport)                                                      \
 571                 fc_starget_##field(starget) = rport->field;             \
 572         else if (i->f->get_starget_##field)                             \
 573                 i->f->get_starget_##field(starget);                     \
 574         return snprintf(buf, sz, format_string,                         \
 575                 cast fc_starget_##field(starget));                      \
 576 }
 577
 578 #define fc_starget_rd_attr(field, format_string, sz)                    \
 579         fc_starget_show_function(field, format_string, sz, )            \
 580 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 581                          show_fc_starget_##field, NULL)
 582
 583 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 584         fc_starget_show_function(field, format_string, sz, (cast))      \
 585 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 586                           show_fc_starget_##field, NULL)
 587
 588 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 589         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 590         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 591         i->private_starget_attrs[count].store = NULL;                   \
 592         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 593         if (i->f->show_starget_##field)                                 \
 594                 count++
 595
 596 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 597         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 598         if (!i->f->set_starget_##field) {                               \
 599                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 600                 i->private_starget_attrs[count].store = NULL;           \
 601         }                                                               \
 602         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 603         if (i->f->show_starget_##field)                                 \
 604                 count++
 605
 606 /* The FC Transport SCSI Target Attributes: */
 607 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 608 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 609 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 610
 611
 612 /*
 613  * Host Attribute Management
 614  */
 615
 616 #define fc_host_show_function(field, format_string, sz, cast)           \
 617 static ssize_t                                                          \
 618 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 619 {                                                                       \
 620         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 621         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 622         if (i->f->get_host_##field)                                     \
 623                 i->f->get_host_##field(shost);                          \
 624         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 625 }
 626
 627 #define fc_host_store_function(field)                                   \
 628 static ssize_t                                                          \
 629 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 630                            size_t count)                                \
 631 {                                                                       \
 632         int val;                                                        \
 633         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 634         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 635                                                                         \
 636         val = simple_strtoul(buf, NULL, 0);                             \
 637         i->f->set_host_##field(shost, val);                             \
 638         return count;                                                   \
 639 }
 640
 641 #define fc_host_rd_attr(field, format_string, sz)                       \
 642         fc_host_show_function(field, format_string, sz, )               \
 643 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 644                          show_fc_host_##field, NULL)
 645
 646 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 647         fc_host_show_function(field, format_string, sz, (cast))         \
 648 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 649                           show_fc_host_##field, NULL)
 650
 651 #define fc_host_rw_attr(field, format_string, sz)                       \
 652         fc_host_show_function(field, format_string, sz, )               \
 653         fc_host_store_function(field)                                   \
 654 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 655                         show_fc_host_##field,                           \
 656                         store_fc_host_##field)
 657
 658 #define fc_host_rd_enum_attr(title, maxlen)                             \
 659 static ssize_t                                                          \
 660 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 661 {                                                                       \
 662         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 663         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 664         const char *name;                                               \
 665         if (i->f->get_host_##title)                                     \
 666                 i->f->get_host_##title(shost);                          \
 667         name = get_fc_##title##_name(fc_host_##title(shost));           \
 668         if (!name)                                                      \
 669                 return -EINVAL;                                         \
 670         return snprintf(buf, maxlen, "%s\n", name);                     \
 671 }                                                                       \
 672 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 673
 674 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 675         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 676         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 677         i->private_host_attrs[count].store = NULL;                      \
 678         i->host_attrs[count] = &i->private_host_attrs[count];           \
 679         if (i->f->show_host_##field)                                    \
 680                 count++
 681
 682 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
 683         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 684         if (!i->f->set_host_##field) {                                  \
 685                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
 686                 i->private_host_attrs[count].store = NULL;              \
 687         }                                                               \
 688         i->host_attrs[count] = &i->private_host_attrs[count];           \
 689         if (i->f->show_host_##field)                                    \
 690                 count++
 691
 692
 693 #define fc_private_host_show_function(field, format_string, sz, cast)   \
 694 static ssize_t                                                          \
 695 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 696 {                                                                       \
 697         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 698         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 699 }
 700
 701 #define fc_private_host_rd_attr(field, format_string, sz)               \
 702         fc_private_host_show_function(field, format_string, sz, )       \
 703 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 704                          show_fc_host_##field, NULL)
 705
 706 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
 707         fc_private_host_show_function(field, format_string, sz, (cast)) \
 708 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 709                           show_fc_host_##field, NULL)
 710
 711 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
 712         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 713         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 714         i->private_host_attrs[count].store = NULL;                      \
 715         i->host_attrs[count] = &i->private_host_attrs[count];           \
 716         count++
 717
 718 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
 719         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 720         i->host_attrs[count] = &i->private_host_attrs[count];           \
 721         count++
 722
 723
 724 /* Fixed Host Attributes */
 725
 726 static ssize_t
 727 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
 728 {
 729         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 730
 731         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
 732                 return snprintf(buf, 20, "unspecified\n");
 733
 734         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
 735 }
 736 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
 737                 show_fc_host_supported_classes, NULL);
 738
 739 static ssize_t
 740 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
 741 {
 742         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 743         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
 744 }
 745 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
 746                 show_fc_host_supported_fc4s, NULL);
 747
 748 static ssize_t
 749 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
 750 {
 751         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 752
 753         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
 754                 return snprintf(buf, 20, "unknown\n");
 755
 756         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
 757 }
 758 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 759                 show_fc_host_supported_speeds, NULL);
 760
 761
 762 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 763 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 764 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
 765 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 766 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
 767
 768
 769 /* Dynamic Host Attributes */
 770
 771 static ssize_t
 772 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
 773 {
 774         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 775         struct fc_internal *i = to_fc_internal(shost->transportt);
 776
 777         if (i->f->get_host_active_fc4s)
 778                 i->f->get_host_active_fc4s(shost);
 779
 780         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
 781 }
 782 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
 783                 show_fc_host_active_fc4s, NULL);
 784
 785 static ssize_t
 786 show_fc_host_speed (struct class_device *cdev, char *buf)
 787 {
 788         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 789         struct fc_internal *i = to_fc_internal(shost->transportt);
 790
 791         if (i->f->get_host_speed)
 792                 i->f->get_host_speed(shost);
 793
 794         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
 795                 return snprintf(buf, 20, "unknown\n");
 796
 797         return get_fc_port_speed_names(fc_host_speed(shost), buf);
 798 }
 799 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
 800                 show_fc_host_speed, NULL);
 801
 802
 803 fc_host_rd_attr(port_id, "0x%06x\n", 20);
 804 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
 805 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 806 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 807
 808
 809 /* Private Host Attributes */
 810
 811 static ssize_t
 812 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
 813 {
 814         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 815         const char *name;
 816
 817         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
 818         if (!name)
 819                 return -EINVAL;
 820         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 821 }
 822
 823 #define get_list_head_entry(pos, head, member)          \
 824         pos = list_entry((head)->next, typeof(*pos), member)
 825
 826 static ssize_t
 827 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
 828         const char *buf, size_t count)
 829 {
 830         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 831         struct fc_rport *rport;
 832         enum fc_tgtid_binding_type val;
 833         unsigned long flags;
 834
 835         if (get_fc_tgtid_bind_type_match(buf, &val))
 836                 return -EINVAL;
 837
 838         /* if changing bind type, purge all unused consistent bindings */
 839         if (val != fc_host_tgtid_bind_type(shost)) {
 840                 spin_lock_irqsave(shost->host_lock, flags);
 841                 while (!list_empty(&fc_host_rport_bindings(shost))) {
 842                         get_list_head_entry(rport,
 843                                 &fc_host_rport_bindings(shost), peers);
 844                         spin_unlock_irqrestore(shost->host_lock, flags);
 845                         fc_rport_terminate(rport);
 846                         spin_lock_irqsave(shost->host_lock, flags);
 847                 }
 848                 spin_unlock_irqrestore(shost->host_lock, flags);
 849         }
 850
 851         fc_host_tgtid_bind_type(shost) = val;
 852         return count;
 853 }
 854
 855 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
 856                         show_fc_private_host_tgtid_bind_type,
 857                         store_fc_private_host_tgtid_bind_type);
 858
 859 /*
 860  * Host Statistics Management
 861  */
 862
 863 /* Show a given an attribute in the statistics group */
 864 static ssize_t
 865 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
 866 {
 867         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 868         struct fc_internal *i = to_fc_internal(shost->transportt);
 869         struct fc_host_statistics *stats;
 870         ssize_t ret = -ENOENT;
 871
 872         if (offset > sizeof(struct fc_host_statistics) ||
 873             offset % sizeof(u64) != 0)
 874                 WARN_ON(1);
 875
 876         if (i->f->get_fc_host_stats) {
 877                 stats = (i->f->get_fc_host_stats)(shost);
 878                 if (stats)
 879                         ret = snprintf(buf, 20, "0x%llx\n",
 880                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
 881         }
 882         return ret;
 883 }
 884
 885
 886 /* generate a read-only statistics attribute */
 887 #define fc_host_statistic(name)                                         \
 888 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
 889 {                                                                       \
 890         return fc_stat_show(cd, buf,                                    \
 891                             offsetof(struct fc_host_statistics, name)); \
 892 }                                                                       \
 893 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
 894
 895 fc_host_statistic(seconds_since_last_reset);
 896 fc_host_statistic(tx_frames);
 897 fc_host_statistic(tx_words);
 898 fc_host_statistic(rx_frames);
 899 fc_host_statistic(rx_words);
 900 fc_host_statistic(lip_count);
 901 fc_host_statistic(nos_count);
 902 fc_host_statistic(error_frames);
 903 fc_host_statistic(dumped_frames);
 904 fc_host_statistic(link_failure_count);
 905 fc_host_statistic(loss_of_sync_count);
 906 fc_host_statistic(loss_of_signal_count);
 907 fc_host_statistic(prim_seq_protocol_err_count);
 908 fc_host_statistic(invalid_tx_word_count);
 909 fc_host_statistic(invalid_crc_count);
 910 fc_host_statistic(fcp_input_requests);
 911 fc_host_statistic(fcp_output_requests);
 912 fc_host_statistic(fcp_control_requests);
 913 fc_host_statistic(fcp_input_megabytes);
 914 fc_host_statistic(fcp_output_megabytes);
 915
 916 static ssize_t
 917 fc_reset_statistics(struct class_device *cdev, const char *buf,
 918                            size_t count)
 919 {
 920         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 921         struct fc_internal *i = to_fc_internal(shost->transportt);
 922
 923         /* ignore any data value written to the attribute */
 924         if (i->f->reset_fc_host_stats) {
 925                 i->f->reset_fc_host_stats(shost);
 926                 return count;
 927         }
 928
 929         return -ENOENT;
 930 }
 931 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
 932                                 fc_reset_statistics);
 933
 934
 935 static struct attribute *fc_statistics_attrs[] = {
 936         &class_device_attr_host_seconds_since_last_reset.attr,
 937         &class_device_attr_host_tx_frames.attr,
 938         &class_device_attr_host_tx_words.attr,
 939         &class_device_attr_host_rx_frames.attr,
 940         &class_device_attr_host_rx_words.attr,
 941         &class_device_attr_host_lip_count.attr,
 942         &class_device_attr_host_nos_count.attr,
 943         &class_device_attr_host_error_frames.attr,
 944         &class_device_attr_host_dumped_frames.attr,
 945         &class_device_attr_host_link_failure_count.attr,
 946         &class_device_attr_host_loss_of_sync_count.attr,
 947         &class_device_attr_host_loss_of_signal_count.attr,
 948         &class_device_attr_host_prim_seq_protocol_err_count.attr,
 949         &class_device_attr_host_invalid_tx_word_count.attr,
 950         &class_device_attr_host_invalid_crc_count.attr,
 951         &class_device_attr_host_fcp_input_requests.attr,
 952         &class_device_attr_host_fcp_output_requests.attr,
 953         &class_device_attr_host_fcp_control_requests.attr,
 954         &class_device_attr_host_fcp_input_megabytes.attr,
 955         &class_device_attr_host_fcp_output_megabytes.attr,
 956         &class_device_attr_host_reset_statistics.attr,
 957         NULL
 958 };
 959
 960 static struct attribute_group fc_statistics_group = {
 961         .name = "statistics",
 962         .attrs = fc_statistics_attrs,
 963 };
 964
 965 static int fc_host_match(struct attribute_container *cont,
 966                           struct device *dev)
 967 {
 968         struct Scsi_Host *shost;
 969         struct fc_internal *i;
 970
 971         if (!scsi_is_host_device(dev))
 972                 return 0;
 973
 974         shost = dev_to_shost(dev);
 975         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 976             != &fc_host_class.class)
 977                 return 0;
 978
 979         i = to_fc_internal(shost->transportt);
 980
 981         return &i->t.host_attrs.ac == cont;
 982 }
 983
 984 static int fc_target_match(struct attribute_container *cont,
 985                             struct device *dev)
 986 {
 987         struct Scsi_Host *shost;
 988         struct fc_internal *i;
 989
 990         if (!scsi_is_target_device(dev))
 991                 return 0;
 992
 993         shost = dev_to_shost(dev->parent);
 994         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 995             != &fc_host_class.class)
 996                 return 0;
 997
 998         i = to_fc_internal(shost->transportt);
 999
1000         return &i->t.target_attrs.ac == cont;
1001 }
1002
1003 static void fc_rport_dev_release(struct device *dev)
1004 {
1005         struct fc_rport *rport = dev_to_rport(dev);
1006         put_device(dev->parent);
1007         kfree(rport);
1008 }
1009
1010 int scsi_is_fc_rport(const struct device *dev)
1011 {
1012         return dev->release == fc_rport_dev_release;
1013 }
1014 EXPORT_SYMBOL(scsi_is_fc_rport);
1015
1016 static int fc_rport_match(struct attribute_container *cont,
1017                             struct device *dev)
1018 {
1019         struct Scsi_Host *shost;
1020         struct fc_internal *i;
1021
1022         if (!scsi_is_fc_rport(dev))
1023                 return 0;
1024
1025         shost = dev_to_shost(dev->parent);
1026         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1027             != &fc_host_class.class)
1028                 return 0;
1029
1030         i = to_fc_internal(shost->transportt);
1031
1032         return &i->rport_attr_cont.ac == cont;
1033 }
1034
1035
1036 /*
1037  * Must be called with shost->host_lock held
1038  */
1039 static struct device *fc_target_parent(struct Scsi_Host *shost,
1040                                         int channel, uint id)
1041 {
1042         struct fc_rport *rport;
1043
1044         list_for_each_entry(rport, &fc_host_rports(shost), peers)
1045                 if ((rport->channel == channel) &&
1046                     (rport->scsi_target_id == id))
1047                         return &rport->dev;
1048
1049         return NULL;
1050 }
1051
1052 struct scsi_transport_template *
1053 fc_attach_transport(struct fc_function_template *ft)
1054 {
1055         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
1056                                         GFP_KERNEL);
1057         int count;
1058
1059         if (unlikely(!i))
1060                 return NULL;
1061
1062         memset(i, 0, sizeof(struct fc_internal));
1063
1064         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1065         i->t.target_attrs.ac.class = &fc_transport_class.class;
1066         i->t.target_attrs.ac.match = fc_target_match;
1067         i->t.target_size = sizeof(struct fc_starget_attrs);
1068         transport_container_register(&i->t.target_attrs);
1069
1070         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1071         i->t.host_attrs.ac.class = &fc_host_class.class;
1072         i->t.host_attrs.ac.match = fc_host_match;
1073         i->t.host_size = sizeof(struct fc_host_attrs);
1074         if (ft->get_fc_host_stats)
1075                 i->t.host_attrs.statistics = &fc_statistics_group;
1076         transport_container_register(&i->t.host_attrs);
1077
1078         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1079         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1080         i->rport_attr_cont.ac.match = fc_rport_match;
1081         transport_container_register(&i->rport_attr_cont);
1082
1083         i->f = ft;
1084
1085         /* Transport uses the shost workq for scsi scanning */
1086         i->t.create_work_queue = 1;
1087
1088         i->t.target_parent = fc_target_parent;
1089
1090         /*
1091          * Setup SCSI Target Attributes.
1092          */
1093         count = 0;
1094         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1095         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1096         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1097
1098         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1099
1100         i->starget_attrs[count] = NULL;
1101
1102
1103         /*
1104          * Setup SCSI Host Attributes.
1105          */
1106         count=0;
1107         SETUP_HOST_ATTRIBUTE_RD(node_name);
1108         SETUP_HOST_ATTRIBUTE_RD(port_name);
1109         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1110         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1111         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1112         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1113         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1114         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1115
1116         SETUP_HOST_ATTRIBUTE_RD(port_id);
1117         SETUP_HOST_ATTRIBUTE_RD(port_type);
1118         SETUP_HOST_ATTRIBUTE_RD(port_state);
1119         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1120         SETUP_HOST_ATTRIBUTE_RD(speed);
1121         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1122
1123         /* Transport-managed attributes */
1124         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1125
1126         BUG_ON(count > FC_HOST_NUM_ATTRS);
1127
1128         i->host_attrs[count] = NULL;
1129
1130         /*
1131          * Setup Remote Port Attributes.
1132          */
1133         count=0;
1134         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1135         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1136         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1137         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1138         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1139         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1140         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1141         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1142         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1143
1144         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1145
1146         i->rport_attrs[count] = NULL;
1147
1148         return &i->t;
1149 }
1150 EXPORT_SYMBOL(fc_attach_transport);
1151
1152 void fc_release_transport(struct scsi_transport_template *t)
1153 {
1154         struct fc_internal *i = to_fc_internal(t);
1155
1156         transport_container_unregister(&i->t.target_attrs);
1157         transport_container_unregister(&i->t.host_attrs);
1158         transport_container_unregister(&i->rport_attr_cont);
1159
1160         kfree(i);
1161 }
1162 EXPORT_SYMBOL(fc_release_transport);
1163
1164
1165 /**
1166  * fc_remove_host - called to terminate any fc_transport-related elements
1167  *                  for a scsi host.
1168  * @rport:      remote port to be unblocked.
1169  *
1170  * This routine is expected to be called immediately preceeding the
1171  * a driver's call to scsi_remove_host().
1172  *
1173  * WARNING: A driver utilizing the fc_transport, which fails to call
1174  *   this routine prior to scsi_remote_host(), will leave dangling
1175  *   objects in /sys/class/fc_remote_ports. Access to any of these
1176  *   objects can result in a system crash !!!
1177  *
1178  * Notes:
1179  *      This routine assumes no locks are held on entry.
1180  **/
1181 void
1182 fc_remove_host(struct Scsi_Host *shost)
1183 {
1184         struct fc_rport *rport, *next_rport;
1185
1186         /* Remove any remote ports */
1187         list_for_each_entry_safe(rport, next_rport,
1188                         &fc_host_rports(shost), peers)
1189                 fc_rport_terminate(rport);
1190         list_for_each_entry_safe(rport, next_rport,
1191                         &fc_host_rport_bindings(shost), peers)
1192                 fc_rport_terminate(rport);
1193 }
1194 EXPORT_SYMBOL(fc_remove_host);
1195
1196 /**
1197  * fc_rport_create - allocates and creates a remote FC port.
1198  * @shost:      scsi host the remote port is connected to.
1199  * @channel:    Channel on shost port connected to.
1200  * @ids:        The world wide names, fc address, and FC4 port
1201  *              roles for the remote port.
1202  *
1203  * Allocates and creates the remoter port structure, including the
1204  * class and sysfs creation.
1205  *
1206  * Notes:
1207  *      This routine assumes no locks are held on entry.
1208  **/
1209 struct fc_rport *
1210 fc_rport_create(struct Scsi_Host *shost, int channel,
1211         struct fc_rport_identifiers  *ids)
1212 {
1213         struct fc_host_attrs *fc_host =
1214                         (struct fc_host_attrs *)shost->shost_data;
1215         struct fc_internal *fci = to_fc_internal(shost->transportt);
1216         struct fc_rport *rport;
1217         struct device *dev;
1218         unsigned long flags;
1219         int error;
1220         size_t size;
1221
1222         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1223         rport = kmalloc(size, GFP_KERNEL);
1224         if (unlikely(!rport)) {
1225                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1226                 return NULL;
1227         }
1228         memset(rport, 0, size);
1229
1230         rport->maxframe_size = -1;
1231         rport->supported_classes = FC_COS_UNSPECIFIED;
1232         rport->dev_loss_tmo = fc_dev_loss_tmo;
1233         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1234         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1235         rport->port_id = ids->port_id;
1236         rport->roles = ids->roles;
1237         rport->port_state = FC_PORTSTATE_ONLINE;
1238         if (fci->f->dd_fcrport_size)
1239                 rport->dd_data = &rport[1];
1240         rport->channel = channel;
1241
1242         INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport);
1243         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1244
1245         spin_lock_irqsave(shost->host_lock, flags);
1246
1247         rport->number = fc_host->next_rport_number++;
1248         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1249                 rport->scsi_target_id = fc_host->next_target_id++;
1250         else
1251                 rport->scsi_target_id = -1;
1252         list_add_tail(&rport->peers, &fc_host_rports(shost));
1253         get_device(&shost->shost_gendev);
1254
1255         spin_unlock_irqrestore(shost->host_lock, flags);
1256
1257         dev = &rport->dev;
1258         device_initialize(dev);
1259         dev->parent = get_device(&shost->shost_gendev);
1260         dev->release = fc_rport_dev_release;
1261         sprintf(dev->bus_id, "rport-%d:%d-%d",
1262                 shost->host_no, channel, rport->number);
1263         transport_setup_device(dev);
1264
1265         error = device_add(dev);
1266         if (error) {
1267                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1268                 goto delete_rport;
1269         }
1270         transport_add_device(dev);
1271         transport_configure_device(dev);
1272
1273         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1274                 /* initiate a scan of the target */
1275                 scsi_queue_work(shost, &rport->scan_work);
1276
1277         return rport;
1278
1279 delete_rport:
1280         transport_destroy_device(dev);
1281         put_device(dev->parent);
1282         spin_lock_irqsave(shost->host_lock, flags);
1283         list_del(&rport->peers);
1284         put_device(&shost->shost_gendev);
1285         spin_unlock_irqrestore(shost->host_lock, flags);
1286         put_device(dev->parent);
1287         kfree(rport);
1288         return NULL;
1289 }
1290
1291 /**
1292  * fc_remote_port_add - notifies the fc transport of the existence
1293  *              of a remote FC port.
1294  * @shost:      scsi host the remote port is connected to.
1295  * @channel:    Channel on shost port connected to.
1296  * @ids:        The world wide names, fc address, and FC4 port
1297  *              roles for the remote port.
1298  *
1299  * The LLDD calls this routine to notify the transport of the existence
1300  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1301  * of the port, it's FC address (port_id), and the FC4 roles that are
1302  * active for the port.
1303  *
1304  * For ports that are FCP targets (aka scsi targets), the FC transport
1305  * maintains consistent target id bindings on behalf of the LLDD.
1306  * A consistent target id binding is an assignment of a target id to
1307  * a remote port identifier, which persists while the scsi host is
1308  * attached. The remote port can disappear, then later reappear, and
1309  * it's target id assignment remains the same. This allows for shifts
1310  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1311  * changes to the scsi subsystem which is based on scsi host number and
1312  * target id values.  Bindings are only valid during the attachment of
1313  * the scsi host. If the host detaches, then later re-attaches, target
1314  * id bindings may change.
1315  *
1316  * This routine is responsible for returning a remote port structure.
1317  * The routine will search the list of remote ports it maintains
1318  * internally on behalf of consistent target id mappings. If found, the
1319  * remote port structure will be reused. Otherwise, a new remote port
1320  * structure will be allocated.
1321  *
1322  * Whenever a remote port is allocated, a new fc_remote_port class
1323  * device is created.
1324  *
1325  * Should not be called from interrupt context.
1326  *
1327  * Notes:
1328  *      This routine assumes no locks are held on entry.
1329  **/
1330 struct fc_rport *
1331 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1332         struct fc_rport_identifiers  *ids)
1333 {
1334         struct fc_rport *rport;
1335         unsigned long flags;
1336         int match = 0;
1337
1338         if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) &&
1339                 (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) {
1340
1341                 /* search for a matching consistent binding */
1342
1343                 spin_lock_irqsave(shost->host_lock, flags);
1344
1345                 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1346                                         peers) {
1347                         if (rport->channel != channel)
1348                                 continue;
1349
1350                         switch (fc_host_tgtid_bind_type(shost)) {
1351                         case FC_TGTID_BIND_BY_WWPN:
1352                                 if (rport->port_name == ids->port_name)
1353                                         match = 1;
1354                                 break;
1355                         case FC_TGTID_BIND_BY_WWNN:
1356                                 if (rport->node_name == ids->node_name)
1357                                         match = 1;
1358                                 break;
1359                         case FC_TGTID_BIND_BY_ID:
1360                                 if (rport->port_id == ids->port_id)
1361                                         match = 1;
1362                                 break;
1363                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1364                                 break;
1365                         }
1366
1367                         if (match) {
1368                                 list_move_tail(&rport->peers,
1369                                         &fc_host_rports(shost));
1370                                 break;
1371                         }
1372                 }
1373
1374                 spin_unlock_irqrestore(shost->host_lock, flags);
1375
1376                 if (match) {
1377                         memcpy(&rport->node_name, &ids->node_name,
1378                                 sizeof(rport->node_name));
1379                         memcpy(&rport->port_name, &ids->port_name,
1380                                 sizeof(rport->port_name));
1381                         rport->port_id = ids->port_id;
1382                         rport->roles = ids->roles;
1383                         rport->port_state = FC_PORTSTATE_ONLINE;
1384
1385                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1386                                 /* initiate a scan of the target */
1387                                 scsi_queue_work(shost, &rport->scan_work);
1388
1389                         return rport;
1390                 }
1391         }
1392
1393         /* No consistent binding found - create new remote port entry */
1394         rport = fc_rport_create(shost, channel, ids);
1395
1396         return rport;
1397 }
1398 EXPORT_SYMBOL(fc_remote_port_add);
1399
1400 /*
1401  * fc_rport_tgt_remove - Removes the scsi target on the remote port
1402  * @rport:      The remote port to be operated on
1403  */
1404 static void
1405 fc_rport_tgt_remove(struct fc_rport *rport)
1406 {
1407         struct Scsi_Host *shost = rport_to_shost(rport);
1408
1409         scsi_target_unblock(&rport->dev);
1410
1411         /* Stop anything on the workq */
1412         if (!cancel_delayed_work(&rport->dev_loss_work))
1413                 flush_scheduled_work();
1414         scsi_flush_work(shost);
1415
1416         scsi_remove_target(&rport->dev);
1417 }
1418
1419 /*
1420  * fc_rport_terminate - this routine tears down and deallocates a remote port.
1421  * @rport:      The remote port to be terminated
1422  *
1423  * Notes:
1424  *      This routine assumes no locks are held on entry.
1425  */
1426 static void
1427 fc_rport_terminate(struct fc_rport  *rport)
1428 {
1429         struct Scsi_Host *shost = rport_to_shost(rport);
1430         struct device *dev = &rport->dev;
1431         unsigned long flags;
1432
1433         fc_rport_tgt_remove(rport);
1434
1435         transport_remove_device(dev);
1436         device_del(dev);
1437         transport_destroy_device(dev);
1438         spin_lock_irqsave(shost->host_lock, flags);
1439         list_del(&rport->peers);
1440         spin_unlock_irqrestore(shost->host_lock, flags);
1441         put_device(&shost->shost_gendev);
1442 }
1443
1444 /**
1445  * fc_remote_port_delete - notifies the fc transport that a remote
1446  *              port is no longer in existence.
1447  * @rport:      The remote port that no longer exists
1448  *
1449  * The LLDD calls this routine to notify the transport that a remote
1450  * port is no longer part of the topology. Note: Although a port
1451  * may no longer be part of the topology, it may persist in the remote
1452  * ports displayed by the fc_host. This is done so that target id
1453  * mappings (managed via the remote port structures), are always visible
1454  * as long as the mapping is valid, regardless of port state,
1455  *
1456  * If the remote port is not an FCP Target, it will be fully torn down
1457  * and deallocated, including the fc_remote_port class device.
1458  *
1459  * If the remote port is an FCP Target, the port structure will be
1460  * marked as Not Present, but will remain as long as there is a valid
1461  * SCSI target id mapping associated with the port structure. Validity
1462  * is determined by the binding type. If binding by wwpn, then the port
1463  * structure is always valid and will not be deallocated until the host
1464  * is removed.  If binding by wwnn, then the port structure is valid
1465  * until another port with the same node name is found in the topology.
1466  * If binding by port id (fc address), then the port structure is valid
1467  * valid until another port with the same address is identified.
1468  *
1469  * Called from interrupt or normal process context.
1470  *
1471  * Notes:
1472  *      This routine assumes no locks are held on entry.
1473  **/
1474 void
1475 fc_remote_port_delete(struct fc_rport  *rport)
1476 {
1477         struct Scsi_Host *shost = rport_to_shost(rport);
1478         unsigned long flags;
1479
1480         /* If no scsi target id mapping or consistent binding type, delete it */
1481         if ((rport->scsi_target_id == -1) ||
1482             (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) {
1483                 fc_rport_terminate(rport);
1484                 return;
1485         }
1486
1487         fc_rport_tgt_remove(rport);
1488
1489         spin_lock_irqsave(shost->host_lock, flags);
1490         list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1491         spin_unlock_irqrestore(shost->host_lock, flags);
1492
1493         /*
1494          * Note: We do not remove or clear the hostdata area. This allows
1495          *   host-specific target data to persist along with the
1496          *   scsi_target_id. It's up to the host to manage it's hostdata area.
1497          */
1498
1499         /*
1500          * Reinitialize port attributes that may change if the port comes back.
1501          */
1502         rport->maxframe_size = -1;
1503         rport->supported_classes = FC_COS_UNSPECIFIED;
1504         rport->roles = FC_RPORT_ROLE_UNKNOWN;
1505         rport->port_state = FC_PORTSTATE_NOTPRESENT;
1506
1507         /* remove the identifiers that aren't used in the consisting binding */
1508         switch (fc_host_tgtid_bind_type(shost)) {
1509         case FC_TGTID_BIND_BY_WWPN:
1510                 rport->node_name = -1;
1511                 rport->port_id = -1;
1512                 break;
1513         case FC_TGTID_BIND_BY_WWNN:
1514                 rport->port_name = -1;
1515                 rport->port_id = -1;
1516                 break;
1517         case FC_TGTID_BIND_BY_ID:
1518                 rport->node_name = -1;
1519                 rport->port_name = -1;
1520                 break;
1521         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
1522                 break;
1523         }
1524 }
1525 EXPORT_SYMBOL(fc_remote_port_delete);
1526
1527 /**
1528  * fc_remote_port_rolechg - notifies the fc transport that the roles
1529  *              on a remote may have changed.
1530  * @rport:      The remote port that changed.
1531  *
1532  * The LLDD calls this routine to notify the transport that the roles
1533  * on a remote port may have changed. The largest effect of this is
1534  * if a port now becomes a FCP Target, it must be allocated a
1535  * scsi target id.  If the port is no longer a FCP target, any
1536  * scsi target id value assigned to it will persist in case the
1537  * role changes back to include FCP Target. No changes in the scsi
1538  * midlayer will be invoked if the role changes (in the expectation
1539  * that the role will be resumed. If it doesn't normal error processing
1540  * will take place).
1541  *
1542  * Should not be called from interrupt context.
1543  *
1544  * Notes:
1545  *      This routine assumes no locks are held on entry.
1546  **/
1547 void
1548 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1549 {
1550         struct Scsi_Host *shost = rport_to_shost(rport);
1551         struct fc_host_attrs *fc_host =
1552                         (struct fc_host_attrs *)shost->shost_data;
1553         unsigned long flags;
1554         int create = 0;
1555
1556         rport->roles = roles;
1557
1558         spin_lock_irqsave(shost->host_lock, flags);
1559         if ((rport->scsi_target_id == -1) &&
1560             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
1561                 rport->scsi_target_id = fc_host->next_target_id++;
1562                 create = 1;
1563         }
1564         spin_unlock_irqrestore(shost->host_lock, flags);
1565
1566         if (create)
1567                 /* initiate a scan of the target */
1568                 scsi_queue_work(shost, &rport->scan_work);
1569 }
1570 EXPORT_SYMBOL(fc_remote_port_rolechg);
1571
1572 /**
1573  * fc_timeout_blocked_rport - Timeout handler for blocked remote port
1574  *                       that fails to return in the alloted time.
1575  * @data:       scsi target that failed to reappear in the alloted time.
1576  **/
1577 static void
1578 fc_timeout_blocked_rport(void  *data)
1579 {
1580         struct fc_rport *rport = (struct fc_rport *)data;
1581
1582         rport->port_state = FC_PORTSTATE_OFFLINE;
1583
1584         dev_printk(KERN_ERR, &rport->dev,
1585                 "blocked FC remote port time out: removing target\n");
1586
1587         /*
1588          * As this only occurs if the remote port (scsi target)
1589          * went away and didn't come back - we'll remove
1590          * all attached scsi devices.
1591          */
1592         scsi_target_unblock(&rport->dev);
1593         scsi_remove_target(&rport->dev);
1594 }
1595
1596 /**
1597  * fc_remote_port_block - temporarily block any scsi traffic to a remote port.
1598  * @rport:      remote port to be blocked.
1599  *
1600  * scsi lldd's with a FC transport call this routine to temporarily stop
1601  * all scsi traffic to a remote port. If the port is not a SCSI target,
1602  * no action is taken. If the port is a SCSI target, all attached devices
1603  * are placed into a SDEV_BLOCK state and a timer is started. The timer is
1604  * represents the maximum amount of time the port may be blocked. If the
1605  * timer expires, the port is considered non-existent and the attached
1606  * scsi devices will be removed.
1607  *
1608  * Called from interrupt or normal process context.
1609  *
1610  * Returns zero if successful or error if not
1611  *
1612  * Notes:
1613  *      This routine assumes no locks are held on entry.
1614  *
1615  *      The timeout and timer types are extracted from the fc transport
1616  *      attributes from the caller's rport pointer.
1617  **/
1618 int
1619 fc_remote_port_block(struct fc_rport *rport)
1620 {
1621         int timeout = rport->dev_loss_tmo;
1622         struct work_struct *work = &rport->dev_loss_work;
1623
1624         if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1625                 return -EINVAL;
1626
1627         scsi_target_block(&rport->dev);
1628
1629         /* cap the length the devices can be blocked */
1630         schedule_delayed_work(work, timeout * HZ);
1631
1632         rport->port_state = FC_PORTSTATE_BLOCKED;
1633         return 0;
1634 }
1635 EXPORT_SYMBOL(fc_remote_port_block);
1636
1637 /**
1638  * fc_remote_port_unblock - restart any blocked scsi traffic to a remote port.
1639  * @rport:      remote port to be unblocked.
1640  *
1641  * scsi lld's with a FC transport call this routine to restart IO to all
1642  * devices associated with the caller's scsi target following a fc_target_block
1643  * request.  Called from interrupt or normal process context.
1644  *
1645  * Notes:
1646  *      This routine assumes no locks are held on entry.
1647  **/
1648  void
1649 fc_remote_port_unblock(struct fc_rport *rport)
1650 {
1651         struct work_struct *work = &rport->dev_loss_work;
1652         struct Scsi_Host *shost = rport_to_shost(rport);
1653
1654         /*
1655          * Stop the target timer first. Take no action on the del_timer
1656          * failure as the state machine state change will validate the
1657          * transaction.
1658          */
1659         if (!cancel_delayed_work(work))
1660                 flush_scheduled_work();
1661
1662         if (rport->port_state == FC_PORTSTATE_OFFLINE)
1663                 /*
1664                  * initiate a scan of the target as the target has
1665                  * been torn down.
1666                  */
1667                 scsi_queue_work(shost, &rport->scan_work);
1668         else
1669                 scsi_target_unblock(&rport->dev);
1670
1671         rport->port_state = FC_PORTSTATE_ONLINE;
1672 }
1673 EXPORT_SYMBOL(fc_remote_port_unblock);
1674
1675 /**
1676  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1677  * @data:       remote port to be scanned.
1678  **/
1679 static void
1680 fc_scsi_scan_rport(void *data)
1681 {
1682         struct fc_rport *rport = (struct fc_rport *)data;
1683
1684         scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1685                         SCAN_WILD_CARD, 1);
1686 }
1687
1688
1689 MODULE_AUTHOR("Martin Hicks");
1690 MODULE_DESCRIPTION("FC Transport Attributes");
1691 MODULE_LICENSE("GPL");
1692
1693 module_init(fc_transport_init);
1694 module_exit(fc_transport_exit);