SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/sched.h>        /* workqueue stuff, HZ */
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include "scsi_priv.h"
  36
  37 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  38
  39 /*
  40  * Redefine so that we can have same named attributes in the
  41  * sdev/starget/host objects.
  42  */
  43 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  44 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  45         __ATTR(_name,_mode,_show,_store)
  46
  47 #define fc_enum_name_search(title, table_type, table)                   \
  48 static const char *get_fc_##title##_name(enum table_type table_key)     \
  49 {                                                                       \
  50         int i;                                                          \
  51         char *name = NULL;                                              \
  52                                                                         \
  53         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  54                 if (table[i].value == table_key) {                      \
  55                         name = table[i].name;                           \
  56                         break;                                          \
  57                 }                                                       \
  58         }                                                               \
  59         return name;                                                    \
  60 }
  61
  62 #define fc_enum_name_match(title, table_type, table)                    \
  63 static int get_fc_##title##_match(const char *table_key,                \
  64                 enum table_type *value)                                 \
  65 {                                                                       \
  66         int i;                                                          \
  67                                                                         \
  68         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  69                 if (strncmp(table_key, table[i].name,                   \
  70                                 table[i].matchlen) == 0) {              \
  71                         *value = table[i].value;                        \
  72                         return 0; /* success */                         \
  73                 }                                                       \
  74         }                                                               \
  75         return 1; /* failure */                                         \
  76 }
  77
  78
  79 /* Convert fc_port_type values to ascii string name */
  80 static struct {
  81         enum fc_port_type       value;
  82         char                    *name;
  83 } fc_port_type_names[] = {
  84         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  85         { FC_PORTTYPE_OTHER,            "Other" },
  86         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  87         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  88         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  89         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  90         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  91 };
  92 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  93 #define FC_PORTTYPE_MAX_NAMELEN         50
  94
  95
  96 /* Convert fc_port_state values to ascii string name */
  97 static struct {
  98         enum fc_port_state      value;
  99         char                    *name;
 100 } fc_port_state_names[] = {
 101         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 102         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 103         { FC_PORTSTATE_ONLINE,          "Online" },
 104         { FC_PORTSTATE_OFFLINE,         "Offline" },
 105         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 106         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 107         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 108         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 109         { FC_PORTSTATE_ERROR,           "Error" },
 110         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 111         { FC_PORTSTATE_DELETED,         "Deleted" },
 112 };
 113 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 114 #define FC_PORTSTATE_MAX_NAMELEN        20
 115
 116
 117 /* Convert fc_tgtid_binding_type values to ascii string name */
 118 static const struct {
 119         enum fc_tgtid_binding_type      value;
 120         char                            *name;
 121         int                             matchlen;
 122 } fc_tgtid_binding_type_names[] = {
 123         { FC_TGTID_BIND_NONE, "none", 4 },
 124         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 125         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 126         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 127 };
 128 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 129                 fc_tgtid_binding_type_names)
 130 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 131                 fc_tgtid_binding_type_names)
 132 #define FC_BINDTYPE_MAX_NAMELEN 30
 133
 134
 135 #define fc_bitfield_name_search(title, table)                   \
 136 static ssize_t                                                  \
 137 get_fc_##title##_names(u32 table_key, char *buf)                \
 138 {                                                               \
 139         char *prefix = "";                                      \
 140         ssize_t len = 0;                                        \
 141         int i;                                                  \
 142                                                                 \
 143         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 144                 if (table[i].value & table_key) {               \
 145                         len += sprintf(buf + len, "%s%s",       \
 146                                 prefix, table[i].name);         \
 147                         prefix = ", ";                          \
 148                 }                                               \
 149         }                                                       \
 150         len += sprintf(buf + len, "\n");                        \
 151         return len;                                             \
 152 }
 153
 154
 155 /* Convert FC_COS bit values to ascii string name */
 156 static const struct {
 157         u32                     value;
 158         char                    *name;
 159 } fc_cos_names[] = {
 160         { FC_COS_CLASS1,        "Class 1" },
 161         { FC_COS_CLASS2,        "Class 2" },
 162         { FC_COS_CLASS3,        "Class 3" },
 163         { FC_COS_CLASS4,        "Class 4" },
 164         { FC_COS_CLASS6,        "Class 6" },
 165 };
 166 fc_bitfield_name_search(cos, fc_cos_names)
 167
 168
 169 /* Convert FC_PORTSPEED bit values to ascii string name */
 170 static const struct {
 171         u32                     value;
 172         char                    *name;
 173 } fc_port_speed_names[] = {
 174         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 175         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 176         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 177         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 178         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 179 };
 180 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 181
 182
 183 static int
 184 show_fc_fc4s (char *buf, u8 *fc4_list)
 185 {
 186         int i, len=0;
 187
 188         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 189                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 190         len += sprintf(buf + len, "\n");
 191         return len;
 192 }
 193
 194
 195 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 196 static const struct {
 197         u32                     value;
 198         char                    *name;
 199 } fc_remote_port_role_names[] = {
 200         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 201         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 202         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 203 };
 204 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 205
 206 /*
 207  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 208  */
 209 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 210 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 211 #define FC_FPORT_PORTID                 0x00000e
 212 #define FC_FABCTLR_PORTID               0x00000d
 213 #define FC_DIRSRVR_PORTID               0x00000c
 214 #define FC_TIMESRVR_PORTID              0x00000b
 215 #define FC_MGMTSRVR_PORTID              0x00000a
 216
 217
 218 static void fc_timeout_deleted_rport(void *data);
 219 static void fc_scsi_scan_rport(void *data);
 220
 221 /*
 222  * Attribute counts pre object type...
 223  * Increase these values if you add attributes
 224  */
 225 #define FC_STARGET_NUM_ATTRS    3
 226 #define FC_RPORT_NUM_ATTRS      9
 227 #define FC_HOST_NUM_ATTRS       17
 228
 229 struct fc_internal {
 230         struct scsi_transport_template t;
 231         struct fc_function_template *f;
 232
 233         /*
 234          * For attributes : each object has :
 235          *   An array of the actual attributes structures
 236          *   An array of null-terminated pointers to the attribute
 237          *     structures - used for mid-layer interaction.
 238          *
 239          * The attribute containers for the starget and host are are
 240          * part of the midlayer. As the remote port is specific to the
 241          * fc transport, we must provide the attribute container.
 242          */
 243         struct class_device_attribute private_starget_attrs[
 244                                                         FC_STARGET_NUM_ATTRS];
 245         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 246
 247         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 248         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 249
 250         struct transport_container rport_attr_cont;
 251         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 252         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 253 };
 254
 255 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 256
 257 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 258                            struct class_device *cdev)
 259 {
 260         struct scsi_target *starget = to_scsi_target(dev);
 261         struct fc_rport *rport = starget_to_rport(starget);
 262
 263         /*
 264          * if parent is remote port, use values from remote port.
 265          * Otherwise, this host uses the fc_transport, but not the
 266          * remote port interface. As such, initialize to known non-values.
 267          */
 268         if (rport) {
 269                 fc_starget_node_name(starget) = rport->node_name;
 270                 fc_starget_port_name(starget) = rport->port_name;
 271                 fc_starget_port_id(starget) = rport->port_id;
 272         } else {
 273                 fc_starget_node_name(starget) = -1;
 274                 fc_starget_port_name(starget) = -1;
 275                 fc_starget_port_id(starget) = -1;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 282                                "fc_transport",
 283                                fc_target_setup,
 284                                NULL,
 285                                NULL);
 286
 287 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 288                          struct class_device *cdev)
 289 {
 290         struct Scsi_Host *shost = dev_to_shost(dev);
 291         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 292
 293         /*
 294          * Set default values easily detected by the midlayer as
 295          * failure cases.  The scsi lldd is responsible for initializing
 296          * all transport attributes to valid values per host.
 297          */
 298         fc_host->node_name = -1;
 299         fc_host->port_name = -1;
 300         fc_host->permanent_port_name = -1;
 301         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 302         memset(fc_host->supported_fc4s, 0,
 303                 sizeof(fc_host->supported_fc4s));
 304         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 305         fc_host->maxframe_size = -1;
 306         memset(fc_host->serial_number, 0,
 307                 sizeof(fc_host->serial_number));
 308
 309         fc_host->port_id = -1;
 310         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 311         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 312         memset(fc_host->active_fc4s, 0,
 313                 sizeof(fc_host->active_fc4s));
 314         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 315         fc_host->fabric_name = -1;
 316         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 317         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 318
 319         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 320
 321         INIT_LIST_HEAD(&fc_host->rports);
 322         INIT_LIST_HEAD(&fc_host->rport_bindings);
 323         fc_host->next_rport_number = 0;
 324         fc_host->next_target_id = 0;
 325
 326         snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
 327                 shost->host_no);
 328         fc_host->work_q = create_singlethread_workqueue(
 329                                         fc_host->work_q_name);
 330         if (!fc_host->work_q)
 331                 return -ENOMEM;
 332
 333         snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
 334                 shost->host_no);
 335         fc_host->devloss_work_q = create_singlethread_workqueue(
 336                                         fc_host->devloss_work_q_name);
 337         if (!fc_host->devloss_work_q) {
 338                 destroy_workqueue(fc_host->work_q);
 339                 fc_host->work_q = NULL;
 340                 return -ENOMEM;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 347                                "fc_host",
 348                                fc_host_setup,
 349                                NULL,
 350                                NULL);
 351
 352 /*
 353  * Setup and Remove actions for remote ports are handled
 354  * in the service functions below.
 355  */
 356 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 357                                "fc_remote_ports",
 358                                NULL,
 359                                NULL,
 360                                NULL);
 361
 362 /*
 363  * Module Parameters
 364  */
 365
 366 /*
 367  * dev_loss_tmo: the default number of seconds that the FC transport
 368  *   should insulate the loss of a remote port.
 369  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 370  */
 371 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 372
 373 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 374 MODULE_PARM_DESC(dev_loss_tmo,
 375                  "Maximum number of seconds that the FC transport should"
 376                  " insulate the loss of a remote port. Once this value is"
 377                  " exceeded, the scsi target is removed. Value should be"
 378                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 379
 380
 381 static __init int fc_transport_init(void)
 382 {
 383         int error = transport_class_register(&fc_host_class);
 384         if (error)
 385                 return error;
 386         error = transport_class_register(&fc_rport_class);
 387         if (error)
 388                 return error;
 389         return transport_class_register(&fc_transport_class);
 390 }
 391
 392 static void __exit fc_transport_exit(void)
 393 {
 394         transport_class_unregister(&fc_transport_class);
 395         transport_class_unregister(&fc_rport_class);
 396         transport_class_unregister(&fc_host_class);
 397 }
 398
 399 /*
 400  * FC Remote Port Attribute Management
 401  */
 402
 403 #define fc_rport_show_function(field, format_string, sz, cast)          \
 404 static ssize_t                                                          \
 405 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 406 {                                                                       \
 407         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 408         struct Scsi_Host *shost = rport_to_shost(rport);                \
 409         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 410         if ((i->f->get_rport_##field) &&                                \
 411             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 412               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 413               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 414                 i->f->get_rport_##field(rport);                         \
 415         return snprintf(buf, sz, format_string, cast rport->field);     \
 416 }
 417
 418 #define fc_rport_store_function(field)                                  \
 419 static ssize_t                                                          \
 420 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 421                            size_t count)                                \
 422 {                                                                       \
 423         int val;                                                        \
 424         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 425         struct Scsi_Host *shost = rport_to_shost(rport);                \
 426         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 427         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 428             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 429             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 430                 return -EBUSY;                                          \
 431         val = simple_strtoul(buf, NULL, 0);                             \
 432         i->f->set_rport_##field(rport, val);                            \
 433         return count;                                                   \
 434 }
 435
 436 #define fc_rport_rd_attr(field, format_string, sz)                      \
 437         fc_rport_show_function(field, format_string, sz, )              \
 438 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 439                          show_fc_rport_##field, NULL)
 440
 441 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 442         fc_rport_show_function(field, format_string, sz, (cast))        \
 443 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 444                           show_fc_rport_##field, NULL)
 445
 446 #define fc_rport_rw_attr(field, format_string, sz)                      \
 447         fc_rport_show_function(field, format_string, sz, )              \
 448         fc_rport_store_function(field)                                  \
 449 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 450                         show_fc_rport_##field,                          \
 451                         store_fc_rport_##field)
 452
 453
 454 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 455 static ssize_t                                                          \
 456 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 457 {                                                                       \
 458         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 459         return snprintf(buf, sz, format_string, cast rport->field);     \
 460 }
 461
 462 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 463         fc_private_rport_show_function(field, format_string, sz, )      \
 464 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 465                          show_fc_rport_##field, NULL)
 466
 467 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 468         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 469 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 470                           show_fc_rport_##field, NULL)
 471
 472
 473 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 474 static ssize_t                                                          \
 475 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 476 {                                                                       \
 477         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 478         const char *name;                                               \
 479         name = get_fc_##title##_name(rport->title);                     \
 480         if (!name)                                                      \
 481                 return -EINVAL;                                         \
 482         return snprintf(buf, maxlen, "%s\n", name);                     \
 483 }                                                                       \
 484 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 485                         show_fc_rport_##title, NULL)
 486
 487
 488 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 489         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 490         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 491         i->private_rport_attrs[count].store = NULL;                     \
 492         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 493         if (i->f->show_rport_##field)                                   \
 494                 count++
 495
 496 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 497         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 498         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 499         i->private_rport_attrs[count].store = NULL;                     \
 500         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 501         count++
 502
 503 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 504         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 505         if (!i->f->set_rport_##field) {                                 \
 506                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 507                 i->private_rport_attrs[count].store = NULL;             \
 508         }                                                               \
 509         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 510         if (i->f->show_rport_##field)                                   \
 511                 count++
 512
 513
 514 /* The FC Transport Remote Port Attributes: */
 515
 516 /* Fixed Remote Port Attributes */
 517
 518 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 519
 520 static ssize_t
 521 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 522 {
 523         struct fc_rport *rport = transport_class_to_rport(cdev);
 524         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 525                 return snprintf(buf, 20, "unspecified\n");
 526         return get_fc_cos_names(rport->supported_classes, buf);
 527 }
 528 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 529                 show_fc_rport_supported_classes, NULL);
 530
 531 /* Dynamic Remote Port Attributes */
 532
 533 /*
 534  * dev_loss_tmo attribute
 535  */
 536 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 537 static ssize_t
 538 store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
 539                            size_t count)
 540 {
 541         int val;
 542         struct fc_rport *rport = transport_class_to_rport(cdev);
 543         struct Scsi_Host *shost = rport_to_shost(rport);
 544         struct fc_internal *i = to_fc_internal(shost->transportt);
 545         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 546             (rport->port_state == FC_PORTSTATE_DELETED) ||
 547             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 548                 return -EBUSY;
 549         val = simple_strtoul(buf, NULL, 0);
 550         if ((val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 551                 return -EINVAL;
 552         i->f->set_rport_dev_loss_tmo(rport, val);
 553         return count;
 554 }
 555 static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 556                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 557
 558
 559 /* Private Remote Port Attributes */
 560
 561 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 562 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 563 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 564
 565 static ssize_t
 566 show_fc_rport_roles (struct class_device *cdev, char *buf)
 567 {
 568         struct fc_rport *rport = transport_class_to_rport(cdev);
 569
 570         /* identify any roles that are port_id specific */
 571         if ((rport->port_id != -1) &&
 572             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 573                                         FC_WELLKNOWN_PORTID_MASK) {
 574                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 575                 case FC_FPORT_PORTID:
 576                         return snprintf(buf, 30, "Fabric Port\n");
 577                 case FC_FABCTLR_PORTID:
 578                         return snprintf(buf, 30, "Fabric Controller\n");
 579                 case FC_DIRSRVR_PORTID:
 580                         return snprintf(buf, 30, "Directory Server\n");
 581                 case FC_TIMESRVR_PORTID:
 582                         return snprintf(buf, 30, "Time Server\n");
 583                 case FC_MGMTSRVR_PORTID:
 584                         return snprintf(buf, 30, "Management Server\n");
 585                 default:
 586                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 587                 }
 588         } else {
 589                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 590                         return snprintf(buf, 20, "unknown\n");
 591                 return get_fc_remote_port_roles_names(rport->roles, buf);
 592         }
 593 }
 594 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 595                 show_fc_rport_roles, NULL);
 596
 597 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 598 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 599
 600
 601
 602 /*
 603  * FC SCSI Target Attribute Management
 604  */
 605
 606 /*
 607  * Note: in the target show function we recognize when the remote
 608  *  port is in the heirarchy and do not allow the driver to get
 609  *  involved in sysfs functions. The driver only gets involved if
 610  *  it's the "old" style that doesn't use rports.
 611  */
 612 #define fc_starget_show_function(field, format_string, sz, cast)        \
 613 static ssize_t                                                          \
 614 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 615 {                                                                       \
 616         struct scsi_target *starget = transport_class_to_starget(cdev); \
 617         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 618         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 619         struct fc_rport *rport = starget_to_rport(starget);             \
 620         if (rport)                                                      \
 621                 fc_starget_##field(starget) = rport->field;             \
 622         else if (i->f->get_starget_##field)                             \
 623                 i->f->get_starget_##field(starget);                     \
 624         return snprintf(buf, sz, format_string,                         \
 625                 cast fc_starget_##field(starget));                      \
 626 }
 627
 628 #define fc_starget_rd_attr(field, format_string, sz)                    \
 629         fc_starget_show_function(field, format_string, sz, )            \
 630 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 631                          show_fc_starget_##field, NULL)
 632
 633 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 634         fc_starget_show_function(field, format_string, sz, (cast))      \
 635 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 636                           show_fc_starget_##field, NULL)
 637
 638 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 639         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 640         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 641         i->private_starget_attrs[count].store = NULL;                   \
 642         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 643         if (i->f->show_starget_##field)                                 \
 644                 count++
 645
 646 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 647         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 648         if (!i->f->set_starget_##field) {                               \
 649                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 650                 i->private_starget_attrs[count].store = NULL;           \
 651         }                                                               \
 652         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 653         if (i->f->show_starget_##field)                                 \
 654                 count++
 655
 656 /* The FC Transport SCSI Target Attributes: */
 657 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 658 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 659 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 660
 661
 662 /*
 663  * Host Attribute Management
 664  */
 665
 666 #define fc_host_show_function(field, format_string, sz, cast)           \
 667 static ssize_t                                                          \
 668 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 669 {                                                                       \
 670         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 671         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 672         if (i->f->get_host_##field)                                     \
 673                 i->f->get_host_##field(shost);                          \
 674         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 675 }
 676
 677 #define fc_host_store_function(field)                                   \
 678 static ssize_t                                                          \
 679 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 680                            size_t count)                                \
 681 {                                                                       \
 682         int val;                                                        \
 683         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 684         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 685                                                                         \
 686         val = simple_strtoul(buf, NULL, 0);                             \
 687         i->f->set_host_##field(shost, val);                             \
 688         return count;                                                   \
 689 }
 690
 691 #define fc_host_store_str_function(field, slen)                         \
 692 static ssize_t                                                          \
 693 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 694                            size_t count)                                \
 695 {                                                                       \
 696         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 697         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 698         unsigned int cnt=count;                                         \
 699                                                                         \
 700         /* count may include a LF at end of string */                   \
 701         if (buf[cnt-1] == '\n')                                         \
 702                 cnt--;                                                  \
 703         if (cnt > ((slen) - 1))                                         \
 704                 return -EINVAL;                                         \
 705         memcpy(fc_host_##field(shost), buf, cnt);                       \
 706         i->f->set_host_##field(shost);                                  \
 707         return count;                                                   \
 708 }
 709
 710 #define fc_host_rd_attr(field, format_string, sz)                       \
 711         fc_host_show_function(field, format_string, sz, )               \
 712 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 713                          show_fc_host_##field, NULL)
 714
 715 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 716         fc_host_show_function(field, format_string, sz, (cast))         \
 717 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 718                           show_fc_host_##field, NULL)
 719
 720 #define fc_host_rw_attr(field, format_string, sz)                       \
 721         fc_host_show_function(field, format_string, sz, )               \
 722         fc_host_store_function(field)                                   \
 723 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 724                         show_fc_host_##field,                           \
 725                         store_fc_host_##field)
 726
 727 #define fc_host_rd_enum_attr(title, maxlen)                             \
 728 static ssize_t                                                          \
 729 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 730 {                                                                       \
 731         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 732         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 733         const char *name;                                               \
 734         if (i->f->get_host_##title)                                     \
 735                 i->f->get_host_##title(shost);                          \
 736         name = get_fc_##title##_name(fc_host_##title(shost));           \
 737         if (!name)                                                      \
 738                 return -EINVAL;                                         \
 739         return snprintf(buf, maxlen, "%s\n", name);                     \
 740 }                                                                       \
 741 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 742
 743 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 744         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 745         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 746         i->private_host_attrs[count].store = NULL;                      \
 747         i->host_attrs[count] = &i->private_host_attrs[count];           \
 748         if (i->f->show_host_##field)                                    \
 749                 count++
 750
 751 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
 752         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 753         if (!i->f->set_host_##field) {                                  \
 754                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
 755                 i->private_host_attrs[count].store = NULL;              \
 756         }                                                               \
 757         i->host_attrs[count] = &i->private_host_attrs[count];           \
 758         if (i->f->show_host_##field)                                    \
 759                 count++
 760
 761
 762 #define fc_private_host_show_function(field, format_string, sz, cast)   \
 763 static ssize_t                                                          \
 764 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 765 {                                                                       \
 766         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 767         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 768 }
 769
 770 #define fc_private_host_rd_attr(field, format_string, sz)               \
 771         fc_private_host_show_function(field, format_string, sz, )       \
 772 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 773                          show_fc_host_##field, NULL)
 774
 775 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
 776         fc_private_host_show_function(field, format_string, sz, (cast)) \
 777 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 778                           show_fc_host_##field, NULL)
 779
 780 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
 781         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 782         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 783         i->private_host_attrs[count].store = NULL;                      \
 784         i->host_attrs[count] = &i->private_host_attrs[count];           \
 785         count++
 786
 787 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
 788 {                                                                       \
 789         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 790         i->host_attrs[count] = &i->private_host_attrs[count];           \
 791         count++;                                                        \
 792 }
 793
 794
 795 /* Fixed Host Attributes */
 796
 797 static ssize_t
 798 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
 799 {
 800         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 801
 802         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
 803                 return snprintf(buf, 20, "unspecified\n");
 804
 805         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
 806 }
 807 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
 808                 show_fc_host_supported_classes, NULL);
 809
 810 static ssize_t
 811 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
 812 {
 813         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 814         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
 815 }
 816 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
 817                 show_fc_host_supported_fc4s, NULL);
 818
 819 static ssize_t
 820 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
 821 {
 822         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 823
 824         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
 825                 return snprintf(buf, 20, "unknown\n");
 826
 827         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
 828 }
 829 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 830                 show_fc_host_supported_speeds, NULL);
 831
 832
 833 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 834 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 835 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
 836                              unsigned long long);
 837 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 838 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
 839
 840
 841 /* Dynamic Host Attributes */
 842
 843 static ssize_t
 844 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
 845 {
 846         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 847         struct fc_internal *i = to_fc_internal(shost->transportt);
 848
 849         if (i->f->get_host_active_fc4s)
 850                 i->f->get_host_active_fc4s(shost);
 851
 852         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
 853 }
 854 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
 855                 show_fc_host_active_fc4s, NULL);
 856
 857 static ssize_t
 858 show_fc_host_speed (struct class_device *cdev, char *buf)
 859 {
 860         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 861         struct fc_internal *i = to_fc_internal(shost->transportt);
 862
 863         if (i->f->get_host_speed)
 864                 i->f->get_host_speed(shost);
 865
 866         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
 867                 return snprintf(buf, 20, "unknown\n");
 868
 869         return get_fc_port_speed_names(fc_host_speed(shost), buf);
 870 }
 871 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
 872                 show_fc_host_speed, NULL);
 873
 874
 875 fc_host_rd_attr(port_id, "0x%06x\n", 20);
 876 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
 877 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 878 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 879 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
 880
 881 fc_private_host_show_function(system_hostname, "%s\n",
 882                 FC_SYMBOLIC_NAME_SIZE + 1, )
 883 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
 884 static FC_CLASS_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
 885                 show_fc_host_system_hostname, store_fc_host_system_hostname);
 886
 887
 888 /* Private Host Attributes */
 889
 890 static ssize_t
 891 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
 892 {
 893         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 894         const char *name;
 895
 896         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
 897         if (!name)
 898                 return -EINVAL;
 899         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 900 }
 901
 902 #define get_list_head_entry(pos, head, member)          \
 903         pos = list_entry((head)->next, typeof(*pos), member)
 904
 905 static ssize_t
 906 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
 907         const char *buf, size_t count)
 908 {
 909         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 910         struct fc_rport *rport;
 911         enum fc_tgtid_binding_type val;
 912         unsigned long flags;
 913
 914         if (get_fc_tgtid_bind_type_match(buf, &val))
 915                 return -EINVAL;
 916
 917         /* if changing bind type, purge all unused consistent bindings */
 918         if (val != fc_host_tgtid_bind_type(shost)) {
 919                 spin_lock_irqsave(shost->host_lock, flags);
 920                 while (!list_empty(&fc_host_rport_bindings(shost))) {
 921                         get_list_head_entry(rport,
 922                                 &fc_host_rport_bindings(shost), peers);
 923                         list_del(&rport->peers);
 924                         rport->port_state = FC_PORTSTATE_DELETED;
 925                         fc_queue_work(shost, &rport->rport_delete_work);
 926                 }
 927                 spin_unlock_irqrestore(shost->host_lock, flags);
 928         }
 929
 930         fc_host_tgtid_bind_type(shost) = val;
 931         return count;
 932 }
 933
 934 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
 935                         show_fc_private_host_tgtid_bind_type,
 936                         store_fc_private_host_tgtid_bind_type);
 937
 938 static ssize_t
 939 store_fc_private_host_issue_lip(struct class_device *cdev,
 940         const char *buf, size_t count)
 941 {
 942         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 943         struct fc_internal *i = to_fc_internal(shost->transportt);
 944         int ret;
 945
 946         /* ignore any data value written to the attribute */
 947         if (i->f->issue_fc_host_lip) {
 948                 ret = i->f->issue_fc_host_lip(shost);
 949                 return ret ? ret: count;
 950         }
 951
 952         return -ENOENT;
 953 }
 954
 955 static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
 956                         store_fc_private_host_issue_lip);
 957
 958 /*
 959  * Host Statistics Management
 960  */
 961
 962 /* Show a given an attribute in the statistics group */
 963 static ssize_t
 964 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
 965 {
 966         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 967         struct fc_internal *i = to_fc_internal(shost->transportt);
 968         struct fc_host_statistics *stats;
 969         ssize_t ret = -ENOENT;
 970
 971         if (offset > sizeof(struct fc_host_statistics) ||
 972             offset % sizeof(u64) != 0)
 973                 WARN_ON(1);
 974
 975         if (i->f->get_fc_host_stats) {
 976                 stats = (i->f->get_fc_host_stats)(shost);
 977                 if (stats)
 978                         ret = snprintf(buf, 20, "0x%llx\n",
 979                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
 980         }
 981         return ret;
 982 }
 983
 984
 985 /* generate a read-only statistics attribute */
 986 #define fc_host_statistic(name)                                         \
 987 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
 988 {                                                                       \
 989         return fc_stat_show(cd, buf,                                    \
 990                             offsetof(struct fc_host_statistics, name)); \
 991 }                                                                       \
 992 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
 993
 994 fc_host_statistic(seconds_since_last_reset);
 995 fc_host_statistic(tx_frames);
 996 fc_host_statistic(tx_words);
 997 fc_host_statistic(rx_frames);
 998 fc_host_statistic(rx_words);
 999 fc_host_statistic(lip_count);
1000 fc_host_statistic(nos_count);
1001 fc_host_statistic(error_frames);
1002 fc_host_statistic(dumped_frames);
1003 fc_host_statistic(link_failure_count);
1004 fc_host_statistic(loss_of_sync_count);
1005 fc_host_statistic(loss_of_signal_count);
1006 fc_host_statistic(prim_seq_protocol_err_count);
1007 fc_host_statistic(invalid_tx_word_count);
1008 fc_host_statistic(invalid_crc_count);
1009 fc_host_statistic(fcp_input_requests);
1010 fc_host_statistic(fcp_output_requests);
1011 fc_host_statistic(fcp_control_requests);
1012 fc_host_statistic(fcp_input_megabytes);
1013 fc_host_statistic(fcp_output_megabytes);
1014
1015 static ssize_t
1016 fc_reset_statistics(struct class_device *cdev, const char *buf,
1017                            size_t count)
1018 {
1019         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1020         struct fc_internal *i = to_fc_internal(shost->transportt);
1021
1022         /* ignore any data value written to the attribute */
1023         if (i->f->reset_fc_host_stats) {
1024                 i->f->reset_fc_host_stats(shost);
1025                 return count;
1026         }
1027
1028         return -ENOENT;
1029 }
1030 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1031                                 fc_reset_statistics);
1032
1033
1034 static struct attribute *fc_statistics_attrs[] = {
1035         &class_device_attr_host_seconds_since_last_reset.attr,
1036         &class_device_attr_host_tx_frames.attr,
1037         &class_device_attr_host_tx_words.attr,
1038         &class_device_attr_host_rx_frames.attr,
1039         &class_device_attr_host_rx_words.attr,
1040         &class_device_attr_host_lip_count.attr,
1041         &class_device_attr_host_nos_count.attr,
1042         &class_device_attr_host_error_frames.attr,
1043         &class_device_attr_host_dumped_frames.attr,
1044         &class_device_attr_host_link_failure_count.attr,
1045         &class_device_attr_host_loss_of_sync_count.attr,
1046         &class_device_attr_host_loss_of_signal_count.attr,
1047         &class_device_attr_host_prim_seq_protocol_err_count.attr,
1048         &class_device_attr_host_invalid_tx_word_count.attr,
1049         &class_device_attr_host_invalid_crc_count.attr,
1050         &class_device_attr_host_fcp_input_requests.attr,
1051         &class_device_attr_host_fcp_output_requests.attr,
1052         &class_device_attr_host_fcp_control_requests.attr,
1053         &class_device_attr_host_fcp_input_megabytes.attr,
1054         &class_device_attr_host_fcp_output_megabytes.attr,
1055         &class_device_attr_host_reset_statistics.attr,
1056         NULL
1057 };
1058
1059 static struct attribute_group fc_statistics_group = {
1060         .name = "statistics",
1061         .attrs = fc_statistics_attrs,
1062 };
1063
1064 static int fc_host_match(struct attribute_container *cont,
1065                           struct device *dev)
1066 {
1067         struct Scsi_Host *shost;
1068         struct fc_internal *i;
1069
1070         if (!scsi_is_host_device(dev))
1071                 return 0;
1072
1073         shost = dev_to_shost(dev);
1074         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1075             != &fc_host_class.class)
1076                 return 0;
1077
1078         i = to_fc_internal(shost->transportt);
1079
1080         return &i->t.host_attrs.ac == cont;
1081 }
1082
1083 static int fc_target_match(struct attribute_container *cont,
1084                             struct device *dev)
1085 {
1086         struct Scsi_Host *shost;
1087         struct fc_internal *i;
1088
1089         if (!scsi_is_target_device(dev))
1090                 return 0;
1091
1092         shost = dev_to_shost(dev->parent);
1093         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1094             != &fc_host_class.class)
1095                 return 0;
1096
1097         i = to_fc_internal(shost->transportt);
1098
1099         return &i->t.target_attrs.ac == cont;
1100 }
1101
1102 static void fc_rport_dev_release(struct device *dev)
1103 {
1104         struct fc_rport *rport = dev_to_rport(dev);
1105         put_device(dev->parent);
1106         kfree(rport);
1107 }
1108
1109 int scsi_is_fc_rport(const struct device *dev)
1110 {
1111         return dev->release == fc_rport_dev_release;
1112 }
1113 EXPORT_SYMBOL(scsi_is_fc_rport);
1114
1115 static int fc_rport_match(struct attribute_container *cont,
1116                             struct device *dev)
1117 {
1118         struct Scsi_Host *shost;
1119         struct fc_internal *i;
1120
1121         if (!scsi_is_fc_rport(dev))
1122                 return 0;
1123
1124         shost = dev_to_shost(dev->parent);
1125         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1126             != &fc_host_class.class)
1127                 return 0;
1128
1129         i = to_fc_internal(shost->transportt);
1130
1131         return &i->rport_attr_cont.ac == cont;
1132 }
1133
1134
1135 /**
1136  * fc_timed_out - FC Transport I/O timeout intercept handler
1137  *
1138  * @scmd:       The SCSI command which timed out
1139  *
1140  * This routine protects against error handlers getting invoked while a
1141  * rport is in a blocked state, typically due to a temporarily loss of
1142  * connectivity. If the error handlers are allowed to proceed, requests
1143  * to abort i/o, reset the target, etc will likely fail as there is no way
1144  * to communicate with the device to perform the requested function. These
1145  * failures may result in the midlayer taking the device offline, requiring
1146  * manual intervention to restore operation.
1147  *
1148  * This routine, called whenever an i/o times out, validates the state of
1149  * the underlying rport. If the rport is blocked, it returns
1150  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1151  * Eventually, either the device will return, or devloss_tmo will fire,
1152  * and when the timeout then fires, it will be handled normally.
1153  * If the rport is not blocked, normal error handling continues.
1154  *
1155  * Notes:
1156  *      This routine assumes no locks are held on entry.
1157  **/
1158 static enum scsi_eh_timer_return
1159 fc_timed_out(struct scsi_cmnd *scmd)
1160 {
1161         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1162
1163         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1164                 return EH_RESET_TIMER;
1165
1166         return EH_NOT_HANDLED;
1167 }
1168
1169 /*
1170  * Must be called with shost->host_lock held
1171  */
1172 static int fc_user_scan(struct Scsi_Host *shost, uint channel,
1173                 uint id, uint lun)
1174 {
1175         struct fc_rport *rport;
1176
1177         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1178                 if (rport->scsi_target_id == -1)
1179                         continue;
1180
1181                 if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
1182                     (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
1183                         scsi_scan_target(&rport->dev, rport->channel,
1184                                          rport->scsi_target_id, lun, 1);
1185                 }
1186         }
1187
1188         return 0;
1189 }
1190
1191 struct scsi_transport_template *
1192 fc_attach_transport(struct fc_function_template *ft)
1193 {
1194         int count;
1195         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
1196                                         GFP_KERNEL);
1197
1198         if (unlikely(!i))
1199                 return NULL;
1200
1201         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1202         i->t.target_attrs.ac.class = &fc_transport_class.class;
1203         i->t.target_attrs.ac.match = fc_target_match;
1204         i->t.target_size = sizeof(struct fc_starget_attrs);
1205         transport_container_register(&i->t.target_attrs);
1206
1207         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1208         i->t.host_attrs.ac.class = &fc_host_class.class;
1209         i->t.host_attrs.ac.match = fc_host_match;
1210         i->t.host_size = sizeof(struct fc_host_attrs);
1211         if (ft->get_fc_host_stats)
1212                 i->t.host_attrs.statistics = &fc_statistics_group;
1213         transport_container_register(&i->t.host_attrs);
1214
1215         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1216         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1217         i->rport_attr_cont.ac.match = fc_rport_match;
1218         transport_container_register(&i->rport_attr_cont);
1219
1220         i->f = ft;
1221
1222         /* Transport uses the shost workq for scsi scanning */
1223         i->t.create_work_queue = 1;
1224
1225         i->t.eh_timed_out = fc_timed_out;
1226
1227         i->t.user_scan = fc_user_scan;
1228
1229         /*
1230          * Setup SCSI Target Attributes.
1231          */
1232         count = 0;
1233         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1234         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1235         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1236
1237         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1238
1239         i->starget_attrs[count] = NULL;
1240
1241
1242         /*
1243          * Setup SCSI Host Attributes.
1244          */
1245         count=0;
1246         SETUP_HOST_ATTRIBUTE_RD(node_name);
1247         SETUP_HOST_ATTRIBUTE_RD(port_name);
1248         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
1249         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1250         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1251         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1252         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1253         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1254
1255         SETUP_HOST_ATTRIBUTE_RD(port_id);
1256         SETUP_HOST_ATTRIBUTE_RD(port_type);
1257         SETUP_HOST_ATTRIBUTE_RD(port_state);
1258         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1259         SETUP_HOST_ATTRIBUTE_RD(speed);
1260         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1261         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1262         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
1263
1264         /* Transport-managed attributes */
1265         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1266         if (ft->issue_fc_host_lip)
1267                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
1268
1269         BUG_ON(count > FC_HOST_NUM_ATTRS);
1270
1271         i->host_attrs[count] = NULL;
1272
1273         /*
1274          * Setup Remote Port Attributes.
1275          */
1276         count=0;
1277         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1278         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1279         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1280         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1281         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1282         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1283         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1284         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1285         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1286
1287         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1288
1289         i->rport_attrs[count] = NULL;
1290
1291         return &i->t;
1292 }
1293 EXPORT_SYMBOL(fc_attach_transport);
1294
1295 void fc_release_transport(struct scsi_transport_template *t)
1296 {
1297         struct fc_internal *i = to_fc_internal(t);
1298
1299         transport_container_unregister(&i->t.target_attrs);
1300         transport_container_unregister(&i->t.host_attrs);
1301         transport_container_unregister(&i->rport_attr_cont);
1302
1303         kfree(i);
1304 }
1305 EXPORT_SYMBOL(fc_release_transport);
1306
1307 /**
1308  * fc_queue_work - Queue work to the fc_host workqueue.
1309  * @shost:      Pointer to Scsi_Host bound to fc_host.
1310  * @work:       Work to queue for execution.
1311  *
1312  * Return value:
1313  *      1 - work queued for execution
1314  *      0 - work is already queued
1315  *      -EINVAL - work queue doesn't exist
1316  **/
1317 static int
1318 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
1319 {
1320         if (unlikely(!fc_host_work_q(shost))) {
1321                 printk(KERN_ERR
1322                         "ERROR: FC host '%s' attempted to queue work, "
1323                         "when no workqueue created.\n", shost->hostt->name);
1324                 dump_stack();
1325
1326                 return -EINVAL;
1327         }
1328
1329         return queue_work(fc_host_work_q(shost), work);
1330 }
1331
1332 /**
1333  * fc_flush_work - Flush a fc_host's workqueue.
1334  * @shost:      Pointer to Scsi_Host bound to fc_host.
1335  **/
1336 static void
1337 fc_flush_work(struct Scsi_Host *shost)
1338 {
1339         if (!fc_host_work_q(shost)) {
1340                 printk(KERN_ERR
1341                         "ERROR: FC host '%s' attempted to flush work, "
1342                         "when no workqueue created.\n", shost->hostt->name);
1343                 dump_stack();
1344                 return;
1345         }
1346
1347         flush_workqueue(fc_host_work_q(shost));
1348 }
1349
1350 /**
1351  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
1352  * @shost:      Pointer to Scsi_Host bound to fc_host.
1353  * @work:       Work to queue for execution.
1354  * @delay:      jiffies to delay the work queuing
1355  *
1356  * Return value:
1357  *      0 on success / != 0 for error
1358  **/
1359 static int
1360 fc_queue_devloss_work(struct Scsi_Host *shost, struct work_struct *work,
1361                                 unsigned long delay)
1362 {
1363         if (unlikely(!fc_host_devloss_work_q(shost))) {
1364                 printk(KERN_ERR
1365                         "ERROR: FC host '%s' attempted to queue work, "
1366                         "when no workqueue created.\n", shost->hostt->name);
1367                 dump_stack();
1368
1369                 return -EINVAL;
1370         }
1371
1372         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
1373 }
1374
1375 /**
1376  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
1377  * @shost:      Pointer to Scsi_Host bound to fc_host.
1378  **/
1379 static void
1380 fc_flush_devloss(struct Scsi_Host *shost)
1381 {
1382         if (!fc_host_devloss_work_q(shost)) {
1383                 printk(KERN_ERR
1384                         "ERROR: FC host '%s' attempted to flush work, "
1385                         "when no workqueue created.\n", shost->hostt->name);
1386                 dump_stack();
1387                 return;
1388         }
1389
1390         flush_workqueue(fc_host_devloss_work_q(shost));
1391 }
1392
1393
1394 /**
1395  * fc_remove_host - called to terminate any fc_transport-related elements
1396  *                  for a scsi host.
1397  * @rport:      remote port to be unblocked.
1398  *
1399  * This routine is expected to be called immediately preceeding the
1400  * a driver's call to scsi_remove_host().
1401  *
1402  * WARNING: A driver utilizing the fc_transport, which fails to call
1403  *   this routine prior to scsi_remote_host(), will leave dangling
1404  *   objects in /sys/class/fc_remote_ports. Access to any of these
1405  *   objects can result in a system crash !!!
1406  *
1407  * Notes:
1408  *      This routine assumes no locks are held on entry.
1409  **/
1410 void
1411 fc_remove_host(struct Scsi_Host *shost)
1412 {
1413         struct fc_rport *rport, *next_rport;
1414         struct workqueue_struct *work_q;
1415         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1416
1417         /* Remove any remote ports */
1418         list_for_each_entry_safe(rport, next_rport,
1419                         &fc_host->rports, peers) {
1420                 list_del(&rport->peers);
1421                 rport->port_state = FC_PORTSTATE_DELETED;
1422                 fc_queue_work(shost, &rport->rport_delete_work);
1423         }
1424
1425         list_for_each_entry_safe(rport, next_rport,
1426                         &fc_host->rport_bindings, peers) {
1427                 list_del(&rport->peers);
1428                 rport->port_state = FC_PORTSTATE_DELETED;
1429                 fc_queue_work(shost, &rport->rport_delete_work);
1430         }
1431
1432         /* flush all scan work items */
1433         scsi_flush_work(shost);
1434
1435         /* flush all stgt delete, and rport delete work items, then kill it  */
1436         if (fc_host->work_q) {
1437                 work_q = fc_host->work_q;
1438                 fc_host->work_q = NULL;
1439                 destroy_workqueue(work_q);
1440         }
1441
1442         /* flush all devloss work items, then kill it  */
1443         if (fc_host->devloss_work_q) {
1444                 work_q = fc_host->devloss_work_q;
1445                 fc_host->devloss_work_q = NULL;
1446                 destroy_workqueue(work_q);
1447         }
1448 }
1449 EXPORT_SYMBOL(fc_remove_host);
1450
1451
1452 /**
1453  * fc_starget_delete - called to delete the scsi decendents of an rport
1454  *                  (target and all sdevs)
1455  *
1456  * @data:       remote port to be operated on.
1457  **/
1458 static void
1459 fc_starget_delete(void *data)
1460 {
1461         struct fc_rport *rport = (struct fc_rport *)data;
1462         struct Scsi_Host *shost = rport_to_shost(rport);
1463         unsigned long flags;
1464
1465         spin_lock_irqsave(shost->host_lock, flags);
1466         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
1467                 spin_unlock_irqrestore(shost->host_lock, flags);
1468                 if (!cancel_delayed_work(&rport->dev_loss_work))
1469                         fc_flush_devloss(shost);
1470                 spin_lock_irqsave(shost->host_lock, flags);
1471                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1472         }
1473         spin_unlock_irqrestore(shost->host_lock, flags);
1474
1475         scsi_remove_target(&rport->dev);
1476 }
1477
1478
1479 /**
1480  * fc_rport_final_delete - finish rport termination and delete it.
1481  *
1482  * @data:       remote port to be deleted.
1483  **/
1484 static void
1485 fc_rport_final_delete(void *data)
1486 {
1487         struct fc_rport *rport = (struct fc_rport *)data;
1488         struct device *dev = &rport->dev;
1489         struct Scsi_Host *shost = rport_to_shost(rport);
1490
1491         /* Delete SCSI target and sdevs */
1492         if (rport->scsi_target_id != -1)
1493                 fc_starget_delete(data);
1494
1495         /*
1496          * if a scan is pending, flush the SCSI Host work_q so that
1497          * that we can reclaim the rport scan work element.
1498          */
1499         if (rport->flags & FC_RPORT_SCAN_PENDING)
1500                 scsi_flush_work(shost);
1501
1502         transport_remove_device(dev);
1503         device_del(dev);
1504         transport_destroy_device(dev);
1505         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1506         put_device(dev);                        /* for self-reference */
1507 }
1508
1509
1510 /**
1511  * fc_rport_create - allocates and creates a remote FC port.
1512  * @shost:      scsi host the remote port is connected to.
1513  * @channel:    Channel on shost port connected to.
1514  * @ids:        The world wide names, fc address, and FC4 port
1515  *              roles for the remote port.
1516  *
1517  * Allocates and creates the remoter port structure, including the
1518  * class and sysfs creation.
1519  *
1520  * Notes:
1521  *      This routine assumes no locks are held on entry.
1522  **/
1523 struct fc_rport *
1524 fc_rport_create(struct Scsi_Host *shost, int channel,
1525         struct fc_rport_identifiers  *ids)
1526 {
1527         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1528         struct fc_internal *fci = to_fc_internal(shost->transportt);
1529         struct fc_rport *rport;
1530         struct device *dev;
1531         unsigned long flags;
1532         int error;
1533         size_t size;
1534
1535         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1536         rport = kzalloc(size, GFP_KERNEL);
1537         if (unlikely(!rport)) {
1538                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1539                 return NULL;
1540         }
1541
1542         rport->maxframe_size = -1;
1543         rport->supported_classes = FC_COS_UNSPECIFIED;
1544         rport->dev_loss_tmo = fc_dev_loss_tmo;
1545         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1546         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1547         rport->port_id = ids->port_id;
1548         rport->roles = ids->roles;
1549         rport->port_state = FC_PORTSTATE_ONLINE;
1550         if (fci->f->dd_fcrport_size)
1551                 rport->dd_data = &rport[1];
1552         rport->channel = channel;
1553
1554         INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport);
1555         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1556         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete, rport);
1557         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete, rport);
1558
1559         spin_lock_irqsave(shost->host_lock, flags);
1560
1561         rport->number = fc_host->next_rport_number++;
1562         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1563                 rport->scsi_target_id = fc_host->next_target_id++;
1564         else
1565                 rport->scsi_target_id = -1;
1566         list_add_tail(&rport->peers, &fc_host->rports);
1567         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
1568
1569         spin_unlock_irqrestore(shost->host_lock, flags);
1570
1571         dev = &rport->dev;
1572         device_initialize(dev);                 /* takes self reference */
1573         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
1574         dev->release = fc_rport_dev_release;
1575         sprintf(dev->bus_id, "rport-%d:%d-%d",
1576                 shost->host_no, channel, rport->number);
1577         transport_setup_device(dev);
1578
1579         error = device_add(dev);
1580         if (error) {
1581                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1582                 goto delete_rport;
1583         }
1584         transport_add_device(dev);
1585         transport_configure_device(dev);
1586
1587         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
1588                 /* initiate a scan of the target */
1589                 rport->flags |= FC_RPORT_SCAN_PENDING;
1590                 scsi_queue_work(shost, &rport->scan_work);
1591         }
1592
1593         return rport;
1594
1595 delete_rport:
1596         transport_destroy_device(dev);
1597         spin_lock_irqsave(shost->host_lock, flags);
1598         list_del(&rport->peers);
1599         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1600         spin_unlock_irqrestore(shost->host_lock, flags);
1601         put_device(dev->parent);
1602         kfree(rport);
1603         return NULL;
1604 }
1605
1606 /**
1607  * fc_remote_port_add - notifies the fc transport of the existence
1608  *              of a remote FC port.
1609  * @shost:      scsi host the remote port is connected to.
1610  * @channel:    Channel on shost port connected to.
1611  * @ids:        The world wide names, fc address, and FC4 port
1612  *              roles for the remote port.
1613  *
1614  * The LLDD calls this routine to notify the transport of the existence
1615  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1616  * of the port, it's FC address (port_id), and the FC4 roles that are
1617  * active for the port.
1618  *
1619  * For ports that are FCP targets (aka scsi targets), the FC transport
1620  * maintains consistent target id bindings on behalf of the LLDD.
1621  * A consistent target id binding is an assignment of a target id to
1622  * a remote port identifier, which persists while the scsi host is
1623  * attached. The remote port can disappear, then later reappear, and
1624  * it's target id assignment remains the same. This allows for shifts
1625  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1626  * changes to the scsi subsystem which is based on scsi host number and
1627  * target id values.  Bindings are only valid during the attachment of
1628  * the scsi host. If the host detaches, then later re-attaches, target
1629  * id bindings may change.
1630  *
1631  * This routine is responsible for returning a remote port structure.
1632  * The routine will search the list of remote ports it maintains
1633  * internally on behalf of consistent target id mappings. If found, the
1634  * remote port structure will be reused. Otherwise, a new remote port
1635  * structure will be allocated.
1636  *
1637  * Whenever a remote port is allocated, a new fc_remote_port class
1638  * device is created.
1639  *
1640  * Should not be called from interrupt context.
1641  *
1642  * Notes:
1643  *      This routine assumes no locks are held on entry.
1644  **/
1645 struct fc_rport *
1646 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1647         struct fc_rport_identifiers  *ids)
1648 {
1649         struct fc_internal *fci = to_fc_internal(shost->transportt);
1650         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1651         struct fc_rport *rport;
1652         unsigned long flags;
1653         int match = 0;
1654
1655         /* ensure any stgt delete functions are done */
1656         fc_flush_work(shost);
1657
1658         /*
1659          * Search the list of "active" rports, for an rport that has been
1660          * deleted, but we've held off the real delete while the target
1661          * is in a "blocked" state.
1662          */
1663         spin_lock_irqsave(shost->host_lock, flags);
1664
1665         list_for_each_entry(rport, &fc_host->rports, peers) {
1666
1667                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
1668                         (rport->channel == channel)) {
1669
1670                         switch (fc_host->tgtid_bind_type) {
1671                         case FC_TGTID_BIND_BY_WWPN:
1672                         case FC_TGTID_BIND_NONE:
1673                                 if (rport->port_name == ids->port_name)
1674                                         match = 1;
1675                                 break;
1676                         case FC_TGTID_BIND_BY_WWNN:
1677                                 if (rport->node_name == ids->node_name)
1678                                         match = 1;
1679                                 break;
1680                         case FC_TGTID_BIND_BY_ID:
1681                                 if (rport->port_id == ids->port_id)
1682                                         match = 1;
1683                                 break;
1684                         }
1685
1686                         if (match) {
1687                                 struct work_struct *work =
1688                                                         &rport->dev_loss_work;
1689
1690                                 memcpy(&rport->node_name, &ids->node_name,
1691                                         sizeof(rport->node_name));
1692                                 memcpy(&rport->port_name, &ids->port_name,
1693                                         sizeof(rport->port_name));
1694                                 rport->port_id = ids->port_id;
1695
1696                                 rport->port_state = FC_PORTSTATE_ONLINE;
1697                                 rport->roles = ids->roles;
1698
1699                                 spin_unlock_irqrestore(shost->host_lock, flags);
1700
1701                                 if (fci->f->dd_fcrport_size)
1702                                         memset(rport->dd_data, 0,
1703                                                 fci->f->dd_fcrport_size);
1704
1705                                 /*
1706                                  * If we were blocked, we were a target.
1707                                  * If no longer a target, we leave the timer
1708                                  * running in case the port changes roles
1709                                  * prior to the timer expiring. If the timer
1710                                  * fires, the target will be torn down.
1711                                  */
1712                                 if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
1713                                         return rport;
1714
1715                                 /* restart the target */
1716
1717                                 /*
1718                                  * Stop the target timer first. Take no action
1719                                  * on the del_timer failure as the state
1720                                  * machine state change will validate the
1721                                  * transaction.
1722                                  */
1723                                 if (!cancel_delayed_work(work))
1724                                         fc_flush_devloss(shost);
1725
1726                                 spin_lock_irqsave(shost->host_lock, flags);
1727
1728                                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1729
1730                                 /* initiate a scan of the target */
1731                                 rport->flags |= FC_RPORT_SCAN_PENDING;
1732                                 scsi_queue_work(shost, &rport->scan_work);
1733
1734                                 spin_unlock_irqrestore(shost->host_lock, flags);
1735
1736                                 scsi_target_unblock(&rport->dev);
1737
1738                                 return rport;
1739                         }
1740                 }
1741         }
1742
1743         /* Search the bindings array */
1744         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
1745
1746                 /* search for a matching consistent binding */
1747
1748                 list_for_each_entry(rport, &fc_host->rport_bindings,
1749                                         peers) {
1750                         if (rport->channel != channel)
1751                                 continue;
1752
1753                         switch (fc_host->tgtid_bind_type) {
1754                         case FC_TGTID_BIND_BY_WWPN:
1755                                 if (rport->port_name == ids->port_name)
1756                                         match = 1;
1757                                 break;
1758                         case FC_TGTID_BIND_BY_WWNN:
1759                                 if (rport->node_name == ids->node_name)
1760                                         match = 1;
1761                                 break;
1762                         case FC_TGTID_BIND_BY_ID:
1763                                 if (rport->port_id == ids->port_id)
1764                                         match = 1;
1765                                 break;
1766                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1767                                 break;
1768                         }
1769
1770                         if (match) {
1771                                 list_move_tail(&rport->peers, &fc_host->rports);
1772                                 break;
1773                         }
1774                 }
1775
1776                 if (match) {
1777                         memcpy(&rport->node_name, &ids->node_name,
1778                                 sizeof(rport->node_name));
1779                         memcpy(&rport->port_name, &ids->port_name,
1780                                 sizeof(rport->port_name));
1781                         rport->port_id = ids->port_id;
1782                         rport->roles = ids->roles;
1783                         rport->port_state = FC_PORTSTATE_ONLINE;
1784
1785                         if (fci->f->dd_fcrport_size)
1786                                 memset(rport->dd_data, 0,
1787                                                 fci->f->dd_fcrport_size);
1788
1789                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
1790                                 /* initiate a scan of the target */
1791                                 rport->flags |= FC_RPORT_SCAN_PENDING;
1792                                 scsi_queue_work(shost, &rport->scan_work);
1793                                 spin_unlock_irqrestore(shost->host_lock, flags);
1794                                 scsi_target_unblock(&rport->dev);
1795                         } else
1796                                 spin_unlock_irqrestore(shost->host_lock, flags);
1797
1798                         return rport;
1799                 }
1800         }
1801
1802         spin_unlock_irqrestore(shost->host_lock, flags);
1803
1804         /* No consistent binding found - create new remote port entry */
1805         rport = fc_rport_create(shost, channel, ids);
1806
1807         return rport;
1808 }
1809 EXPORT_SYMBOL(fc_remote_port_add);
1810
1811
1812 /**
1813  * fc_remote_port_delete - notifies the fc transport that a remote
1814  *              port is no longer in existence.
1815  * @rport:      The remote port that no longer exists
1816  *
1817  * The LLDD calls this routine to notify the transport that a remote
1818  * port is no longer part of the topology. Note: Although a port
1819  * may no longer be part of the topology, it may persist in the remote
1820  * ports displayed by the fc_host. We do this under 2 conditions:
1821  * - If the port was a scsi target, we delay its deletion by "blocking" it.
1822  *   This allows the port to temporarily disappear, then reappear without
1823  *   disrupting the SCSI device tree attached to it. During the "blocked"
1824  *   period the port will still exist.
1825  * - If the port was a scsi target and disappears for longer than we
1826  *   expect, we'll delete the port and the tear down the SCSI device tree
1827  *   attached to it. However, we want to semi-persist the target id assigned
1828  *   to that port if it eventually does exist. The port structure will
1829  *   remain (although with minimal information) so that the target id
1830  *   bindings remails.
1831  *
1832  * If the remote port is not an FCP Target, it will be fully torn down
1833  * and deallocated, including the fc_remote_port class device.
1834  *
1835  * If the remote port is an FCP Target, the port will be placed in a
1836  * temporary blocked state. From the LLDD's perspective, the rport no
1837  * longer exists. From the SCSI midlayer's perspective, the SCSI target
1838  * exists, but all sdevs on it are blocked from further I/O. The following
1839  * is then expected:
1840  *   If the remote port does not return (signaled by a LLDD call to
1841  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
1842  *   scsi target is removed - killing all outstanding i/o and removing the
1843  *   scsi devices attached ot it. The port structure will be marked Not
1844  *   Present and be partially cleared, leaving only enough information to
1845  *   recognize the remote port relative to the scsi target id binding if
1846  *   it later appears.  The port will remain as long as there is a valid
1847  *   binding (e.g. until the user changes the binding type or unloads the
1848  *   scsi host with the binding).
1849  *
1850  *   If the remote port returns within the dev_loss_tmo value (and matches
1851  *   according to the target id binding type), the port structure will be
1852  *   reused. If it is no longer a SCSI target, the target will be torn
1853  *   down. If it continues to be a SCSI target, then the target will be
1854  *   unblocked (allowing i/o to be resumed), and a scan will be activated
1855  *   to ensure that all luns are detected.
1856  *
1857  * Called from normal process context only - cannot be called from interrupt.
1858  *
1859  * Notes:
1860  *      This routine assumes no locks are held on entry.
1861  **/
1862 void
1863 fc_remote_port_delete(struct fc_rport  *rport)
1864 {
1865         struct Scsi_Host *shost = rport_to_shost(rport);
1866         int timeout = rport->dev_loss_tmo;
1867         unsigned long flags;
1868
1869         /*
1870          * No need to flush the fc_host work_q's, as all adds are synchronous.
1871          *
1872          * We do need to reclaim the rport scan work element, so eventually
1873          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
1874          * there's still a scan pending.
1875          */
1876
1877         spin_lock_irqsave(shost->host_lock, flags);
1878
1879         /* If no scsi target id mapping, delete it */
1880         if (rport->scsi_target_id == -1) {
1881                 list_del(&rport->peers);
1882                 rport->port_state = FC_PORTSTATE_DELETED;
1883                 fc_queue_work(shost, &rport->rport_delete_work);
1884                 spin_unlock_irqrestore(shost->host_lock, flags);
1885                 return;
1886         }
1887
1888         rport->port_state = FC_PORTSTATE_BLOCKED;
1889
1890         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
1891
1892         spin_unlock_irqrestore(shost->host_lock, flags);
1893
1894         scsi_target_block(&rport->dev);
1895
1896         /* cap the length the devices can be blocked until they are deleted */
1897         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
1898 }
1899 EXPORT_SYMBOL(fc_remote_port_delete);
1900
1901 /**
1902  * fc_remote_port_rolechg - notifies the fc transport that the roles
1903  *              on a remote may have changed.
1904  * @rport:      The remote port that changed.
1905  *
1906  * The LLDD calls this routine to notify the transport that the roles
1907  * on a remote port may have changed. The largest effect of this is
1908  * if a port now becomes a FCP Target, it must be allocated a
1909  * scsi target id.  If the port is no longer a FCP target, any
1910  * scsi target id value assigned to it will persist in case the
1911  * role changes back to include FCP Target. No changes in the scsi
1912  * midlayer will be invoked if the role changes (in the expectation
1913  * that the role will be resumed. If it doesn't normal error processing
1914  * will take place).
1915  *
1916  * Should not be called from interrupt context.
1917  *
1918  * Notes:
1919  *      This routine assumes no locks are held on entry.
1920  **/
1921 void
1922 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1923 {
1924         struct Scsi_Host *shost = rport_to_shost(rport);
1925         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1926         unsigned long flags;
1927         int create = 0;
1928
1929         spin_lock_irqsave(shost->host_lock, flags);
1930         if (roles & FC_RPORT_ROLE_FCP_TARGET) {
1931                 if (rport->scsi_target_id == -1) {
1932                         rport->scsi_target_id = fc_host->next_target_id++;
1933                         create = 1;
1934                 } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
1935                         create = 1;
1936         }
1937
1938         rport->roles = roles;
1939
1940         spin_unlock_irqrestore(shost->host_lock, flags);
1941
1942         if (create) {
1943                 /*
1944                  * There may have been a delete timer running on the
1945                  * port. Ensure that it is cancelled as we now know
1946                  * the port is an FCP Target.
1947                  * Note: we know the rport is exists and in an online
1948                  *  state as the LLDD would not have had an rport
1949                  *  reference to pass us.
1950                  *
1951                  * Take no action on the del_timer failure as the state
1952                  * machine state change will validate the
1953                  * transaction.
1954                  */
1955                 if (!cancel_delayed_work(&rport->dev_loss_work))
1956                         fc_flush_devloss(shost);
1957
1958                 spin_lock_irqsave(shost->host_lock, flags);
1959                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1960                 spin_unlock_irqrestore(shost->host_lock, flags);
1961
1962                 /* ensure any stgt delete functions are done */
1963                 fc_flush_work(shost);
1964
1965                 /* initiate a scan of the target */
1966                 spin_lock_irqsave(shost->host_lock, flags);
1967                 rport->flags |= FC_RPORT_SCAN_PENDING;
1968                 scsi_queue_work(shost, &rport->scan_work);
1969                 spin_unlock_irqrestore(shost->host_lock, flags);
1970                 scsi_target_unblock(&rport->dev);
1971         }
1972 }
1973 EXPORT_SYMBOL(fc_remote_port_rolechg);
1974
1975 /**
1976  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
1977  *                       was a SCSI target (thus was blocked), and failed
1978  *                       to return in the alloted time.
1979  *
1980  * @data:       rport target that failed to reappear in the alloted time.
1981  **/
1982 static void
1983 fc_timeout_deleted_rport(void  *data)
1984 {
1985         struct fc_rport *rport = (struct fc_rport *)data;
1986         struct Scsi_Host *shost = rport_to_shost(rport);
1987         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1988         unsigned long flags;
1989
1990         spin_lock_irqsave(shost->host_lock, flags);
1991
1992         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1993
1994         /*
1995          * If the port is ONLINE, then it came back. Validate it's still an
1996          * FCP target. If not, tear down the scsi_target on it.
1997          */
1998         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
1999             !(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2000                 dev_printk(KERN_ERR, &rport->dev,
2001                         "blocked FC remote port time out: no longer"
2002                         " a FCP target, removing starget\n");
2003                 spin_unlock_irqrestore(shost->host_lock, flags);
2004                 scsi_target_unblock(&rport->dev);
2005                 fc_queue_work(shost, &rport->stgt_delete_work);
2006                 return;
2007         }
2008
2009         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2010                 spin_unlock_irqrestore(shost->host_lock, flags);
2011                 dev_printk(KERN_ERR, &rport->dev,
2012                         "blocked FC remote port time out: leaving target alone\n");
2013                 return;
2014         }
2015
2016         if (fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) {
2017                 list_del(&rport->peers);
2018                 rport->port_state = FC_PORTSTATE_DELETED;
2019                 dev_printk(KERN_ERR, &rport->dev,
2020                         "blocked FC remote port time out: removing target\n");
2021                 fc_queue_work(shost, &rport->rport_delete_work);
2022                 spin_unlock_irqrestore(shost->host_lock, flags);
2023                 return;
2024         }
2025
2026         dev_printk(KERN_ERR, &rport->dev,
2027                 "blocked FC remote port time out: removing target and "
2028                 "saving binding\n");
2029
2030         list_move_tail(&rport->peers, &fc_host->rport_bindings);
2031
2032         /*
2033          * Note: We do not remove or clear the hostdata area. This allows
2034          *   host-specific target data to persist along with the
2035          *   scsi_target_id. It's up to the host to manage it's hostdata area.
2036          */
2037
2038         /*
2039          * Reinitialize port attributes that may change if the port comes back.
2040          */
2041         rport->maxframe_size = -1;
2042         rport->supported_classes = FC_COS_UNSPECIFIED;
2043         rport->roles = FC_RPORT_ROLE_UNKNOWN;
2044         rport->port_state = FC_PORTSTATE_NOTPRESENT;
2045
2046         /* remove the identifiers that aren't used in the consisting binding */
2047         switch (fc_host->tgtid_bind_type) {
2048         case FC_TGTID_BIND_BY_WWPN:
2049                 rport->node_name = -1;
2050                 rport->port_id = -1;
2051                 break;
2052         case FC_TGTID_BIND_BY_WWNN:
2053                 rport->port_name = -1;
2054                 rport->port_id = -1;
2055                 break;
2056         case FC_TGTID_BIND_BY_ID:
2057                 rport->node_name = -1;
2058                 rport->port_name = -1;
2059                 break;
2060         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
2061                 break;
2062         }
2063
2064         /*
2065          * As this only occurs if the remote port (scsi target)
2066          * went away and didn't come back - we'll remove
2067          * all attached scsi devices.
2068          */
2069         spin_unlock_irqrestore(shost->host_lock, flags);
2070
2071         scsi_target_unblock(&rport->dev);
2072         fc_queue_work(shost, &rport->stgt_delete_work);
2073 }
2074
2075 /**
2076  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
2077  *
2078  * @data:       remote port to be scanned.
2079  **/
2080 static void
2081 fc_scsi_scan_rport(void *data)
2082 {
2083         struct fc_rport *rport = (struct fc_rport *)data;
2084         struct Scsi_Host *shost = rport_to_shost(rport);
2085         unsigned long flags;
2086
2087         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2088             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2089                 scsi_scan_target(&rport->dev, rport->channel,
2090                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
2091         }
2092
2093         spin_lock_irqsave(shost->host_lock, flags);
2094         rport->flags &= ~FC_RPORT_SCAN_PENDING;
2095         spin_unlock_irqrestore(shost->host_lock, flags);
2096 }
2097
2098
2099 MODULE_AUTHOR("Martin Hicks");
2100 MODULE_DESCRIPTION("FC Transport Attributes");
2101 MODULE_LICENSE("GPL");
2102
2103 module_init(fc_transport_init);
2104 module_exit(fc_transport_exit);