git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_transport.h>
  32 #include <scsi/scsi_transport_fc.h>
  33 #include "scsi_priv.h"
  34
  35 #define FC_PRINTK(x, l, f, a...)        printk(l "scsi(%d:%d:%d:%d): " f, (x)->host->host_no, (x)->channel, (x)->id, (x)->lun , ##a)
  36
  37 /*
  38  * Redefine so that we can have same named attributes in the
  39  * sdev/starget/host objects.
  40  */
  41 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  42 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  43         __ATTR(_name,_mode,_show,_store)
  44
  45 #define fc_enum_name_search(title, table_type, table)                   \
  46 static const char *get_fc_##title##_name(enum table_type table_key)     \
  47 {                                                                       \
  48         int i;                                                          \
  49         char *name = NULL;                                              \
  50                                                                         \
  51         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
  52                 if (table[i].value == table_key) {                      \
  53                         name = table[i].name;                           \
  54                         break;                                          \
  55                 }                                                       \
  56         }                                                               \
  57         return name;                                                    \
  58 }
  59
  60 #define fc_enum_name_match(title, table_type, table)                    \
  61 static int get_fc_##title##_match(const char *table_key,                \
  62                 enum table_type *value)                                 \
  63 {                                                                       \
  64         int i;                                                          \
  65                                                                         \
  66         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
  67                 if (strncmp(table_key, table[i].name,                   \
  68                                 table[i].matchlen) == 0) {              \
  69                         *value = table[i].value;                        \
  70                         return 0; /* success */                         \
  71                 }                                                       \
  72         }                                                               \
  73         return 1; /* failure */                                         \
  74 }
  75
  76
  77 /* Convert fc_port_type values to ascii string name */
  78 static struct {
  79         enum fc_port_type       value;
  80         char                    *name;
  81 } fc_port_type_names[] = {
  82         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  83         { FC_PORTTYPE_OTHER,            "Other" },
  84         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  85         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  86         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  87         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  88         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  89 };
  90 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  91 #define FC_PORTTYPE_MAX_NAMELEN         50
  92
  93
  94 /* Convert fc_port_state values to ascii string name */
  95 static struct {
  96         enum fc_port_state      value;
  97         char                    *name;
  98 } fc_port_state_names[] = {
  99         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 100         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 101         { FC_PORTSTATE_ONLINE,          "Online" },
 102         { FC_PORTSTATE_OFFLINE,         "Offline" },
 103         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 104         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 105         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 106         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 107         { FC_PORTSTATE_ERROR,           "Error" },
 108         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 109 };
 110 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 111 #define FC_PORTSTATE_MAX_NAMELEN        20
 112
 113
 114 /* Convert fc_tgtid_binding_type values to ascii string name */
 115 static struct {
 116         enum fc_tgtid_binding_type      value;
 117         char                            *name;
 118         int                             matchlen;
 119 } fc_tgtid_binding_type_names[] = {
 120         { FC_TGTID_BIND_NONE, "none", 4 },
 121         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 122         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 123         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 124 };
 125 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 126                 fc_tgtid_binding_type_names)
 127 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 128                 fc_tgtid_binding_type_names)
 129 #define FC_BINDTYPE_MAX_NAMELEN 30
 130
 131
 132 #define fc_bitfield_name_search(title, table)                   \
 133 static ssize_t                                                  \
 134 get_fc_##title##_names(u32 table_key, char *buf)                \
 135 {                                                               \
 136         char *prefix = "";                                      \
 137         ssize_t len = 0;                                        \
 138         int i;                                                  \
 139                                                                 \
 140         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 141                 if (table[i].value & table_key) {               \
 142                         len += sprintf(buf + len, "%s%s",       \
 143                                 prefix, table[i].name);         \
 144                         prefix = ", ";                          \
 145                 }                                               \
 146         }                                                       \
 147         len += sprintf(buf + len, "\n");                        \
 148         return len;                                             \
 149 }
 150
 151
 152 /* Convert FC_COS bit values to ascii string name */
 153 static struct {
 154         u32                     value;
 155         char                    *name;
 156 } fc_cos_names[] = {
 157         { FC_COS_CLASS1,        "Class 1" },
 158         { FC_COS_CLASS2,        "Class 2" },
 159         { FC_COS_CLASS3,        "Class 3" },
 160         { FC_COS_CLASS4,        "Class 4" },
 161         { FC_COS_CLASS6,        "Class 6" },
 162 };
 163 fc_bitfield_name_search(cos, fc_cos_names)
 164
 165
 166 /* Convert FC_PORTSPEED bit values to ascii string name */
 167 static struct {
 168         u32                     value;
 169         char                    *name;
 170 } fc_port_speed_names[] = {
 171         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 172         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 173         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 174         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 175         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 176 };
 177 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 178
 179
 180 static int
 181 show_fc_fc4s (char *buf, u8 *fc4_list)
 182 {
 183         int i, len=0;
 184
 185         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 186                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 187         len += sprintf(buf + len, "\n");
 188         return len;
 189 }
 190
 191
 192 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 193 static struct {
 194         u32                     value;
 195         char                    *name;
 196 } fc_remote_port_role_names[] = {
 197         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 198         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 199         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 200 };
 201 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 202
 203 /*
 204  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 205  */
 206 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 207 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 208 #define FC_FPORT_PORTID                 0x00000e
 209 #define FC_FABCTLR_PORTID               0x00000d
 210 #define FC_DIRSRVR_PORTID               0x00000c
 211 #define FC_TIMESRVR_PORTID              0x00000b
 212 #define FC_MGMTSRVR_PORTID              0x00000a
 213
 214
 215 static void fc_timeout_blocked_rport(void *data);
 216 static void fc_scsi_scan_rport(void *data);
 217 static void fc_rport_terminate(struct fc_rport  *rport);
 218
 219 /*
 220  * Attribute counts pre object type...
 221  * Increase these values if you add attributes
 222  */
 223 #define FC_STARGET_NUM_ATTRS    3
 224 #define FC_RPORT_NUM_ATTRS      9
 225 #define FC_HOST_NUM_ATTRS       15
 226
 227 struct fc_internal {
 228         struct scsi_transport_template t;
 229         struct fc_function_template *f;
 230
 231         /*
 232          * For attributes : each object has :
 233          *   An array of the actual attributes structures
 234          *   An array of null-terminated pointers to the attribute
 235          *     structures - used for mid-layer interaction.
 236          *
 237          * The attribute containers for the starget and host are are
 238          * part of the midlayer. As the remote port is specific to the
 239          * fc transport, we must provide the attribute container.
 240          */
 241         struct class_device_attribute private_starget_attrs[
 242                                                         FC_STARGET_NUM_ATTRS];
 243         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 244
 245         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 246         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 247
 248         struct transport_container rport_attr_cont;
 249         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 250         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 251 };
 252
 253 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 254
 255 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 256                            struct class_device *cdev)
 257 {
 258         struct scsi_target *starget = to_scsi_target(dev);
 259         struct fc_rport *rport = starget_to_rport(starget);
 260
 261         /*
 262          * if parent is remote port, use values from remote port.
 263          * Otherwise, this host uses the fc_transport, but not the
 264          * remote port interface. As such, initialize to known non-values.
 265          */
 266         if (rport) {
 267                 fc_starget_node_name(starget) = rport->node_name;
 268                 fc_starget_port_name(starget) = rport->port_name;
 269                 fc_starget_port_id(starget) = rport->port_id;
 270         } else {
 271                 fc_starget_node_name(starget) = -1;
 272                 fc_starget_port_name(starget) = -1;
 273                 fc_starget_port_id(starget) = -1;
 274         }
 275
 276         return 0;
 277 }
 278
 279 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 280                                "fc_transport",
 281                                fc_target_setup,
 282                                NULL,
 283                                NULL);
 284
 285 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 286                          struct class_device *cdev)
 287 {
 288         struct Scsi_Host *shost = dev_to_shost(dev);
 289
 290         /*
 291          * Set default values easily detected by the midlayer as
 292          * failure cases.  The scsi lldd is responsible for initializing
 293          * all transport attributes to valid values per host.
 294          */
 295         fc_host_node_name(shost) = -1;
 296         fc_host_port_name(shost) = -1;
 297         fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
 298         memset(fc_host_supported_fc4s(shost), 0,
 299                 sizeof(fc_host_supported_fc4s(shost)));
 300         memset(fc_host_symbolic_name(shost), 0,
 301                 sizeof(fc_host_symbolic_name(shost)));
 302         fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
 303         fc_host_maxframe_size(shost) = -1;
 304         memset(fc_host_serial_number(shost), 0,
 305                 sizeof(fc_host_serial_number(shost)));
 306
 307         fc_host_port_id(shost) = -1;
 308         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 309         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 310         memset(fc_host_active_fc4s(shost), 0,
 311                 sizeof(fc_host_active_fc4s(shost)));
 312         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 313         fc_host_fabric_name(shost) = -1;
 314
 315         fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
 316
 317         INIT_LIST_HEAD(&fc_host_rports(shost));
 318         INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
 319         fc_host_next_rport_number(shost) = 0;
 320         fc_host_next_target_id(shost) = 0;
 321
 322         return 0;
 323 }
 324
 325 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 326                                "fc_host",
 327                                fc_host_setup,
 328                                NULL,
 329                                NULL);
 330
 331 /*
 332  * Setup and Remove actions for remote ports are handled
 333  * in the service functions below.
 334  */
 335 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 336                                "fc_remote_ports",
 337                                NULL,
 338                                NULL,
 339                                NULL);
 340
 341 /*
 342  * Module Parameters
 343  */
 344
 345 /*
 346  * dev_loss_tmo: the default number of seconds that the FC transport
 347  *   should insulate the loss of a remote port.
 348  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 349  */
 350 static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
 351
 352 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 353 MODULE_PARM_DESC(dev_loss_tmo,
 354                  "Maximum number of seconds that the FC transport should"
 355                  " insulate the loss of a remote port. Once this value is"
 356                  " exceeded, the scsi target is removed. Value should be"
 357                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 358
 359
 360 static __init int fc_transport_init(void)
 361 {
 362         int error = transport_class_register(&fc_host_class);
 363         if (error)
 364                 return error;
 365         error = transport_class_register(&fc_rport_class);
 366         if (error)
 367                 return error;
 368         return transport_class_register(&fc_transport_class);
 369 }
 370
 371 static void __exit fc_transport_exit(void)
 372 {
 373         transport_class_unregister(&fc_transport_class);
 374         transport_class_unregister(&fc_rport_class);
 375         transport_class_unregister(&fc_host_class);
 376 }
 377
 378 /*
 379  * FC Remote Port Attribute Management
 380  */
 381
 382 #define fc_rport_show_function(field, format_string, sz, cast)          \
 383 static ssize_t                                                          \
 384 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 385 {                                                                       \
 386         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 387         struct Scsi_Host *shost = rport_to_shost(rport);                \
 388         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 389         if (i->f->get_rport_##field)                                    \
 390                 i->f->get_rport_##field(rport);                         \
 391         return snprintf(buf, sz, format_string, cast rport->field);     \
 392 }
 393
 394 #define fc_rport_store_function(field)                                  \
 395 static ssize_t                                                          \
 396 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 397                            size_t count)                                \
 398 {                                                                       \
 399         int val;                                                        \
 400         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 401         struct Scsi_Host *shost = rport_to_shost(rport);                \
 402         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 403         val = simple_strtoul(buf, NULL, 0);                             \
 404         i->f->set_rport_##field(rport, val);                            \
 405         return count;                                                   \
 406 }
 407
 408 #define fc_rport_rd_attr(field, format_string, sz)                      \
 409         fc_rport_show_function(field, format_string, sz, )              \
 410 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 411                          show_fc_rport_##field, NULL)
 412
 413 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 414         fc_rport_show_function(field, format_string, sz, (cast))        \
 415 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 416                           show_fc_rport_##field, NULL)
 417
 418 #define fc_rport_rw_attr(field, format_string, sz)                      \
 419         fc_rport_show_function(field, format_string, sz, )              \
 420         fc_rport_store_function(field)                                  \
 421 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 422                         show_fc_rport_##field,                          \
 423                         store_fc_rport_##field)
 424
 425
 426 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 427 static ssize_t                                                          \
 428 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 429 {                                                                       \
 430         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 431         return snprintf(buf, sz, format_string, cast rport->field);     \
 432 }
 433
 434 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 435         fc_private_rport_show_function(field, format_string, sz, )      \
 436 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 437                          show_fc_rport_##field, NULL)
 438
 439 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 440         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 441 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 442                           show_fc_rport_##field, NULL)
 443
 444
 445 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 446 static ssize_t                                                          \
 447 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 448 {                                                                       \
 449         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 450         const char *name;                                               \
 451         name = get_fc_##title##_name(rport->title);                     \
 452         if (!name)                                                      \
 453                 return -EINVAL;                                         \
 454         return snprintf(buf, maxlen, "%s\n", name);                     \
 455 }                                                                       \
 456 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 457                         show_fc_rport_##title, NULL)
 458
 459
 460 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 461         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 462         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 463         i->private_rport_attrs[count].store = NULL;                     \
 464         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 465         if (i->f->show_rport_##field)                                   \
 466                 count++
 467
 468 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 469         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 470         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 471         i->private_rport_attrs[count].store = NULL;                     \
 472         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 473         count++
 474
 475 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 476         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 477         if (!i->f->set_rport_##field) {                                 \
 478                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 479                 i->private_rport_attrs[count].store = NULL;             \
 480         }                                                               \
 481         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 482         if (i->f->show_rport_##field)                                   \
 483                 count++
 484
 485
 486 /* The FC Transport Remote Port Attributes: */
 487
 488 /* Fixed Remote Port Attributes */
 489
 490 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 491
 492 static ssize_t
 493 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 494 {
 495         struct fc_rport *rport = transport_class_to_rport(cdev);
 496         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 497                 return snprintf(buf, 20, "unspecified\n");
 498         return get_fc_cos_names(rport->supported_classes, buf);
 499 }
 500 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 501                 show_fc_rport_supported_classes, NULL);
 502
 503 /* Dynamic Remote Port Attributes */
 504
 505 fc_rport_rw_attr(dev_loss_tmo, "%d\n", 20);
 506
 507
 508 /* Private Remote Port Attributes */
 509
 510 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 511 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 512 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 513
 514 static ssize_t
 515 show_fc_rport_roles (struct class_device *cdev, char *buf)
 516 {
 517         struct fc_rport *rport = transport_class_to_rport(cdev);
 518
 519         /* identify any roles that are port_id specific */
 520         if ((rport->port_id != -1) &&
 521             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 522                                         FC_WELLKNOWN_PORTID_MASK) {
 523                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 524                 case FC_FPORT_PORTID:
 525                         return snprintf(buf, 30, "Fabric Port\n");
 526                 case FC_FABCTLR_PORTID:
 527                         return snprintf(buf, 30, "Fabric Controller\n");
 528                 case FC_DIRSRVR_PORTID:
 529                         return snprintf(buf, 30, "Directory Server\n");
 530                 case FC_TIMESRVR_PORTID:
 531                         return snprintf(buf, 30, "Time Server\n");
 532                 case FC_MGMTSRVR_PORTID:
 533                         return snprintf(buf, 30, "Management Server\n");
 534                 default:
 535                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 536                 }
 537         } else {
 538                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 539                         return snprintf(buf, 20, "unknown\n");
 540                 return get_fc_remote_port_roles_names(rport->roles, buf);
 541         }
 542 }
 543 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 544                 show_fc_rport_roles, NULL);
 545
 546 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 547 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 548
 549
 550
 551 /*
 552  * FC SCSI Target Attribute Management
 553  */
 554
 555 /*
 556  * Note: in the target show function we recognize when the remote
 557  *  port is in the heirarchy and do not allow the driver to get
 558  *  involved in sysfs functions. The driver only gets involved if
 559  *  it's the "old" style that doesn't use rports.
 560  */
 561 #define fc_starget_show_function(field, format_string, sz, cast)        \
 562 static ssize_t                                                          \
 563 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 564 {                                                                       \
 565         struct scsi_target *starget = transport_class_to_starget(cdev); \
 566         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 567         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 568         struct fc_rport *rport = starget_to_rport(starget);             \
 569         if (rport)                                                      \
 570                 fc_starget_##field(starget) = rport->field;             \
 571         else if (i->f->get_starget_##field)                             \
 572                 i->f->get_starget_##field(starget);                     \
 573         return snprintf(buf, sz, format_string,                         \
 574                 cast fc_starget_##field(starget));                      \
 575 }
 576
 577 #define fc_starget_rd_attr(field, format_string, sz)                    \
 578         fc_starget_show_function(field, format_string, sz, )            \
 579 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 580                          show_fc_starget_##field, NULL)
 581
 582 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 583         fc_starget_show_function(field, format_string, sz, (cast))      \
 584 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 585                           show_fc_starget_##field, NULL)
 586
 587 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 588         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 589         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 590         i->private_starget_attrs[count].store = NULL;                   \
 591         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 592         if (i->f->show_starget_##field)                                 \
 593                 count++
 594
 595 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 596         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 597         if (!i->f->set_starget_##field) {                               \
 598                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 599                 i->private_starget_attrs[count].store = NULL;           \
 600         }                                                               \
 601         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 602         if (i->f->show_starget_##field)                                 \
 603                 count++
 604
 605 /* The FC Transport SCSI Target Attributes: */
 606 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 607 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 608 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 609
 610
 611 /*
 612  * Host Attribute Management
 613  */
 614
 615 #define fc_host_show_function(field, format_string, sz, cast)           \
 616 static ssize_t                                                          \
 617 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 618 {                                                                       \
 619         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 620         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 621         if (i->f->get_host_##field)                                     \
 622                 i->f->get_host_##field(shost);                          \
 623         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 624 }
 625
 626 #define fc_host_store_function(field)                                   \
 627 static ssize_t                                                          \
 628 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 629                            size_t count)                                \
 630 {                                                                       \
 631         int val;                                                        \
 632         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 633         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 634                                                                         \
 635         val = simple_strtoul(buf, NULL, 0);                             \
 636         i->f->set_host_##field(shost, val);                             \
 637         return count;                                                   \
 638 }
 639
 640 #define fc_host_rd_attr(field, format_string, sz)                       \
 641         fc_host_show_function(field, format_string, sz, )               \
 642 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 643                          show_fc_host_##field, NULL)
 644
 645 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 646         fc_host_show_function(field, format_string, sz, (cast))         \
 647 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 648                           show_fc_host_##field, NULL)
 649
 650 #define fc_host_rw_attr(field, format_string, sz)                       \
 651         fc_host_show_function(field, format_string, sz, )               \
 652         fc_host_store_function(field)                                   \
 653 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 654                         show_fc_host_##field,                           \
 655                         store_fc_host_##field)
 656
 657 #define fc_host_rd_enum_attr(title, maxlen)                             \
 658 static ssize_t                                                          \
 659 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 660 {                                                                       \
 661         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 662         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 663         const char *name;                                               \
 664         if (i->f->get_host_##title)                                     \
 665                 i->f->get_host_##title(shost);                          \
 666         name = get_fc_##title##_name(fc_host_##title(shost));           \
 667         if (!name)                                                      \
 668                 return -EINVAL;                                         \
 669         return snprintf(buf, maxlen, "%s\n", name);                     \
 670 }                                                                       \
 671 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 672
 673 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 674         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 675         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 676         i->private_host_attrs[count].store = NULL;                      \
 677         i->host_attrs[count] = &i->private_host_attrs[count];           \
 678         if (i->f->show_host_##field)                                    \
 679                 count++
 680
 681 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
 682         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 683         if (!i->f->set_host_##field) {                                  \
 684                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
 685                 i->private_host_attrs[count].store = NULL;              \
 686         }                                                               \
 687         i->host_attrs[count] = &i->private_host_attrs[count];           \
 688         if (i->f->show_host_##field)                                    \
 689                 count++
 690
 691
 692 #define fc_private_host_show_function(field, format_string, sz, cast)   \
 693 static ssize_t                                                          \
 694 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 695 {                                                                       \
 696         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 697         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 698 }
 699
 700 #define fc_private_host_rd_attr(field, format_string, sz)               \
 701         fc_private_host_show_function(field, format_string, sz, )       \
 702 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 703                          show_fc_host_##field, NULL)
 704
 705 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
 706         fc_private_host_show_function(field, format_string, sz, (cast)) \
 707 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 708                           show_fc_host_##field, NULL)
 709
 710 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
 711         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 712         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
 713         i->private_host_attrs[count].store = NULL;                      \
 714         i->host_attrs[count] = &i->private_host_attrs[count];           \
 715         count++
 716
 717 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
 718         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 719         i->host_attrs[count] = &i->private_host_attrs[count];           \
 720         count++
 721
 722
 723 /* Fixed Host Attributes */
 724
 725 static ssize_t
 726 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
 727 {
 728         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 729
 730         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
 731                 return snprintf(buf, 20, "unspecified\n");
 732
 733         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
 734 }
 735 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
 736                 show_fc_host_supported_classes, NULL);
 737
 738 static ssize_t
 739 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
 740 {
 741         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 742         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
 743 }
 744 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
 745                 show_fc_host_supported_fc4s, NULL);
 746
 747 static ssize_t
 748 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
 749 {
 750         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 751
 752         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
 753                 return snprintf(buf, 20, "unknown\n");
 754
 755         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
 756 }
 757 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
 758                 show_fc_host_supported_speeds, NULL);
 759
 760
 761 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 762 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 763 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
 764 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
 765 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
 766
 767
 768 /* Dynamic Host Attributes */
 769
 770 static ssize_t
 771 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
 772 {
 773         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 774         struct fc_internal *i = to_fc_internal(shost->transportt);
 775
 776         if (i->f->get_host_active_fc4s)
 777                 i->f->get_host_active_fc4s(shost);
 778
 779         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
 780 }
 781 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
 782                 show_fc_host_active_fc4s, NULL);
 783
 784 static ssize_t
 785 show_fc_host_speed (struct class_device *cdev, char *buf)
 786 {
 787         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 788         struct fc_internal *i = to_fc_internal(shost->transportt);
 789
 790         if (i->f->get_host_speed)
 791                 i->f->get_host_speed(shost);
 792
 793         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
 794                 return snprintf(buf, 20, "unknown\n");
 795
 796         return get_fc_port_speed_names(fc_host_speed(shost), buf);
 797 }
 798 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
 799                 show_fc_host_speed, NULL);
 800
 801
 802 fc_host_rd_attr(port_id, "0x%06x\n", 20);
 803 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
 804 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 805 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 806
 807
 808 /* Private Host Attributes */
 809
 810 static ssize_t
 811 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
 812 {
 813         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 814         const char *name;
 815
 816         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
 817         if (!name)
 818                 return -EINVAL;
 819         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 820 }
 821
 822 static ssize_t
 823 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
 824         const char *buf, size_t count)
 825 {
 826         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 827         struct fc_rport *rport, *next_rport;
 828         enum fc_tgtid_binding_type val;
 829         unsigned long flags;
 830
 831         if (get_fc_tgtid_bind_type_match(buf, &val))
 832                 return -EINVAL;
 833
 834         /* if changing bind type, purge all unused consistent bindings */
 835         if (val != fc_host_tgtid_bind_type(shost)) {
 836                 spin_lock_irqsave(shost->host_lock, flags);
 837                 list_for_each_entry_safe(rport, next_rport,
 838                                 &fc_host_rport_bindings(shost), peers)
 839                         fc_rport_terminate(rport);
 840                 spin_unlock_irqrestore(shost->host_lock, flags);
 841         }
 842
 843         fc_host_tgtid_bind_type(shost) = val;
 844         return count;
 845 }
 846
 847 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
 848                         show_fc_private_host_tgtid_bind_type,
 849                         store_fc_private_host_tgtid_bind_type);
 850
 851 /*
 852  * Host Statistics Management
 853  */
 854
 855 /* Show a given an attribute in the statistics group */
 856 static ssize_t
 857 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
 858 {
 859         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 860         struct fc_internal *i = to_fc_internal(shost->transportt);
 861         struct fc_host_statistics *stats;
 862         ssize_t ret = -ENOENT;
 863
 864         if (offset > sizeof(struct fc_host_statistics) ||
 865             offset % sizeof(u64) != 0)
 866                 WARN_ON(1);
 867
 868         if (i->f->get_fc_host_stats) {
 869                 stats = (i->f->get_fc_host_stats)(shost);
 870                 if (stats)
 871                         ret = snprintf(buf, 20, "0x%llx\n",
 872                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
 873         }
 874         return ret;
 875 }
 876
 877
 878 /* generate a read-only statistics attribute */
 879 #define fc_host_statistic(name)                                         \
 880 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
 881 {                                                                       \
 882         return fc_stat_show(cd, buf,                                    \
 883                             offsetof(struct fc_host_statistics, name)); \
 884 }                                                                       \
 885 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
 886
 887 fc_host_statistic(seconds_since_last_reset);
 888 fc_host_statistic(tx_frames);
 889 fc_host_statistic(tx_words);
 890 fc_host_statistic(rx_frames);
 891 fc_host_statistic(rx_words);
 892 fc_host_statistic(lip_count);
 893 fc_host_statistic(nos_count);
 894 fc_host_statistic(error_frames);
 895 fc_host_statistic(dumped_frames);
 896 fc_host_statistic(link_failure_count);
 897 fc_host_statistic(loss_of_sync_count);
 898 fc_host_statistic(loss_of_signal_count);
 899 fc_host_statistic(prim_seq_protocol_err_count);
 900 fc_host_statistic(invalid_tx_word_count);
 901 fc_host_statistic(invalid_crc_count);
 902 fc_host_statistic(fcp_input_requests);
 903 fc_host_statistic(fcp_output_requests);
 904 fc_host_statistic(fcp_control_requests);
 905 fc_host_statistic(fcp_input_megabytes);
 906 fc_host_statistic(fcp_output_megabytes);
 907
 908 static ssize_t
 909 fc_reset_statistics(struct class_device *cdev, const char *buf,
 910                            size_t count)
 911 {
 912         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 913         struct fc_internal *i = to_fc_internal(shost->transportt);
 914
 915         /* ignore any data value written to the attribute */
 916         if (i->f->reset_fc_host_stats) {
 917                 i->f->reset_fc_host_stats(shost);
 918                 return count;
 919         }
 920
 921         return -ENOENT;
 922 }
 923 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
 924                                 fc_reset_statistics);
 925
 926
 927 static struct attribute *fc_statistics_attrs[] = {
 928         &class_device_attr_host_seconds_since_last_reset.attr,
 929         &class_device_attr_host_tx_frames.attr,
 930         &class_device_attr_host_tx_words.attr,
 931         &class_device_attr_host_rx_frames.attr,
 932         &class_device_attr_host_rx_words.attr,
 933         &class_device_attr_host_lip_count.attr,
 934         &class_device_attr_host_nos_count.attr,
 935         &class_device_attr_host_error_frames.attr,
 936         &class_device_attr_host_dumped_frames.attr,
 937         &class_device_attr_host_link_failure_count.attr,
 938         &class_device_attr_host_loss_of_sync_count.attr,
 939         &class_device_attr_host_loss_of_signal_count.attr,
 940         &class_device_attr_host_prim_seq_protocol_err_count.attr,
 941         &class_device_attr_host_invalid_tx_word_count.attr,
 942         &class_device_attr_host_invalid_crc_count.attr,
 943         &class_device_attr_host_fcp_input_requests.attr,
 944         &class_device_attr_host_fcp_output_requests.attr,
 945         &class_device_attr_host_fcp_control_requests.attr,
 946         &class_device_attr_host_fcp_input_megabytes.attr,
 947         &class_device_attr_host_fcp_output_megabytes.attr,
 948         &class_device_attr_host_reset_statistics.attr,
 949         NULL
 950 };
 951
 952 static struct attribute_group fc_statistics_group = {
 953         .name = "statistics",
 954         .attrs = fc_statistics_attrs,
 955 };
 956
 957 static int fc_host_match(struct attribute_container *cont,
 958                           struct device *dev)
 959 {
 960         struct Scsi_Host *shost;
 961         struct fc_internal *i;
 962
 963         if (!scsi_is_host_device(dev))
 964                 return 0;
 965
 966         shost = dev_to_shost(dev);
 967         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 968             != &fc_host_class.class)
 969                 return 0;
 970
 971         i = to_fc_internal(shost->transportt);
 972
 973         return &i->t.host_attrs.ac == cont;
 974 }
 975
 976 static int fc_target_match(struct attribute_container *cont,
 977                             struct device *dev)
 978 {
 979         struct Scsi_Host *shost;
 980         struct fc_internal *i;
 981
 982         if (!scsi_is_target_device(dev))
 983                 return 0;
 984
 985         shost = dev_to_shost(dev->parent);
 986         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 987             != &fc_host_class.class)
 988                 return 0;
 989
 990         i = to_fc_internal(shost->transportt);
 991
 992         return &i->t.target_attrs.ac == cont;
 993 }
 994
 995 static void fc_rport_dev_release(struct device *dev)
 996 {
 997         struct fc_rport *rport = dev_to_rport(dev);
 998         put_device(dev->parent);
 999         kfree(rport);
1000 }
1001
1002 int scsi_is_fc_rport(const struct device *dev)
1003 {
1004         return dev->release == fc_rport_dev_release;
1005 }
1006 EXPORT_SYMBOL(scsi_is_fc_rport);
1007
1008 static int fc_rport_match(struct attribute_container *cont,
1009                             struct device *dev)
1010 {
1011         struct Scsi_Host *shost;
1012         struct fc_internal *i;
1013
1014         if (!scsi_is_fc_rport(dev))
1015                 return 0;
1016
1017         shost = dev_to_shost(dev->parent);
1018         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1019             != &fc_host_class.class)
1020                 return 0;
1021
1022         i = to_fc_internal(shost->transportt);
1023
1024         return &i->rport_attr_cont.ac == cont;
1025 }
1026
1027
1028 /*
1029  * Must be called with shost->host_lock held
1030  */
1031 static struct device *fc_target_parent(struct Scsi_Host *shost,
1032                                         int channel, uint id)
1033 {
1034         struct fc_rport *rport;
1035
1036         list_for_each_entry(rport, &fc_host_rports(shost), peers)
1037                 if ((rport->channel == channel) &&
1038                     (rport->scsi_target_id == id))
1039                         return &rport->dev;
1040
1041         return NULL;
1042 }
1043
1044 struct scsi_transport_template *
1045 fc_attach_transport(struct fc_function_template *ft)
1046 {
1047         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
1048                                         GFP_KERNEL);
1049         int count;
1050
1051         if (unlikely(!i))
1052                 return NULL;
1053
1054         memset(i, 0, sizeof(struct fc_internal));
1055
1056         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1057         i->t.target_attrs.ac.class = &fc_transport_class.class;
1058         i->t.target_attrs.ac.match = fc_target_match;
1059         i->t.target_size = sizeof(struct fc_starget_attrs);
1060         transport_container_register(&i->t.target_attrs);
1061
1062         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1063         i->t.host_attrs.ac.class = &fc_host_class.class;
1064         i->t.host_attrs.ac.match = fc_host_match;
1065         i->t.host_size = sizeof(struct fc_host_attrs);
1066         if (ft->get_fc_host_stats)
1067                 i->t.host_attrs.statistics = &fc_statistics_group;
1068         transport_container_register(&i->t.host_attrs);
1069
1070         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1071         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1072         i->rport_attr_cont.ac.match = fc_rport_match;
1073         transport_container_register(&i->rport_attr_cont);
1074
1075         i->f = ft;
1076
1077         /* Transport uses the shost workq for scsi scanning */
1078         i->t.create_work_queue = 1;
1079
1080         i->t.target_parent = fc_target_parent;
1081
1082         /*
1083          * Setup SCSI Target Attributes.
1084          */
1085         count = 0;
1086         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1087         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1088         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1089
1090         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1091
1092         i->starget_attrs[count] = NULL;
1093
1094
1095         /*
1096          * Setup SCSI Host Attributes.
1097          */
1098         count=0;
1099         SETUP_HOST_ATTRIBUTE_RD(node_name);
1100         SETUP_HOST_ATTRIBUTE_RD(port_name);
1101         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1102         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1103         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1104         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1105         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1106         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1107
1108         SETUP_HOST_ATTRIBUTE_RD(port_id);
1109         SETUP_HOST_ATTRIBUTE_RD(port_type);
1110         SETUP_HOST_ATTRIBUTE_RD(port_state);
1111         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1112         SETUP_HOST_ATTRIBUTE_RD(speed);
1113         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1114
1115         /* Transport-managed attributes */
1116         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1117
1118         BUG_ON(count > FC_HOST_NUM_ATTRS);
1119
1120         i->host_attrs[count] = NULL;
1121
1122         /*
1123          * Setup Remote Port Attributes.
1124          */
1125         count=0;
1126         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1127         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1128         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1129         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1130         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1131         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1132         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1133         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1134         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1135
1136         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1137
1138         i->rport_attrs[count] = NULL;
1139
1140         return &i->t;
1141 }
1142 EXPORT_SYMBOL(fc_attach_transport);
1143
1144 void fc_release_transport(struct scsi_transport_template *t)
1145 {
1146         struct fc_internal *i = to_fc_internal(t);
1147
1148         transport_container_unregister(&i->t.target_attrs);
1149         transport_container_unregister(&i->t.host_attrs);
1150         transport_container_unregister(&i->rport_attr_cont);
1151
1152         kfree(i);
1153 }
1154 EXPORT_SYMBOL(fc_release_transport);
1155
1156
1157 /**
1158  * fc_remove_host - called to terminate any fc_transport-related elements
1159  *                  for a scsi host.
1160  * @rport:      remote port to be unblocked.
1161  *
1162  * This routine is expected to be called immediately preceeding the
1163  * a driver's call to scsi_remove_host().
1164  *
1165  * WARNING: A driver utilizing the fc_transport, which fails to call
1166  *   this routine prior to scsi_remote_host(), will leave dangling
1167  *   objects in /sys/class/fc_remote_ports. Access to any of these
1168  *   objects can result in a system crash !!!
1169  *
1170  * Notes:
1171  *      This routine assumes no locks are held on entry.
1172  **/
1173 void
1174 fc_remove_host(struct Scsi_Host *shost)
1175 {
1176         struct fc_rport *rport, *next_rport;
1177
1178         /* Remove any remote ports */
1179         list_for_each_entry_safe(rport, next_rport,
1180                         &fc_host_rports(shost), peers)
1181                 fc_rport_terminate(rport);
1182         list_for_each_entry_safe(rport, next_rport,
1183                         &fc_host_rport_bindings(shost), peers)
1184                 fc_rport_terminate(rport);
1185 }
1186 EXPORT_SYMBOL(fc_remove_host);
1187
1188 /**
1189  * fc_rport_create - allocates and creates a remote FC port.
1190  * @shost:      scsi host the remote port is connected to.
1191  * @channel:    Channel on shost port connected to.
1192  * @ids:        The world wide names, fc address, and FC4 port
1193  *              roles for the remote port.
1194  *
1195  * Allocates and creates the remoter port structure, including the
1196  * class and sysfs creation.
1197  *
1198  * Notes:
1199  *      This routine assumes no locks are held on entry.
1200  **/
1201 struct fc_rport *
1202 fc_rport_create(struct Scsi_Host *shost, int channel,
1203         struct fc_rport_identifiers  *ids)
1204 {
1205         struct fc_host_attrs *fc_host =
1206                         (struct fc_host_attrs *)shost->shost_data;
1207         struct fc_internal *fci = to_fc_internal(shost->transportt);
1208         struct fc_rport *rport;
1209         struct device *dev;
1210         unsigned long flags;
1211         int error;
1212         size_t size;
1213
1214         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1215         rport = kmalloc(size, GFP_KERNEL);
1216         if (unlikely(!rport)) {
1217                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1218                 return NULL;
1219         }
1220         memset(rport, 0, size);
1221
1222         rport->maxframe_size = -1;
1223         rport->supported_classes = FC_COS_UNSPECIFIED;
1224         rport->dev_loss_tmo = fc_dev_loss_tmo;
1225         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1226         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1227         rport->port_id = ids->port_id;
1228         rport->roles = ids->roles;
1229         rport->port_state = FC_PORTSTATE_ONLINE;
1230         if (fci->f->dd_fcrport_size)
1231                 rport->dd_data = &rport[1];
1232         rport->channel = channel;
1233
1234         INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport);
1235         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1236
1237         spin_lock_irqsave(shost->host_lock, flags);
1238
1239         rport->number = fc_host->next_rport_number++;
1240         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1241                 rport->scsi_target_id = fc_host->next_target_id++;
1242         else
1243                 rport->scsi_target_id = -1;
1244         list_add_tail(&rport->peers, &fc_host_rports(shost));
1245         get_device(&shost->shost_gendev);
1246
1247         spin_unlock_irqrestore(shost->host_lock, flags);
1248
1249         dev = &rport->dev;
1250         device_initialize(dev);
1251         dev->parent = get_device(&shost->shost_gendev);
1252         dev->release = fc_rport_dev_release;
1253         sprintf(dev->bus_id, "rport-%d:%d-%d",
1254                 shost->host_no, channel, rport->number);
1255         transport_setup_device(dev);
1256
1257         error = device_add(dev);
1258         if (error) {
1259                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1260                 goto delete_rport;
1261         }
1262         transport_add_device(dev);
1263         transport_configure_device(dev);
1264
1265         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1266                 /* initiate a scan of the target */
1267                 scsi_queue_work(shost, &rport->scan_work);
1268
1269         return rport;
1270
1271 delete_rport:
1272         transport_destroy_device(dev);
1273         put_device(dev->parent);
1274         spin_lock_irqsave(shost->host_lock, flags);
1275         list_del(&rport->peers);
1276         put_device(&shost->shost_gendev);
1277         spin_unlock_irqrestore(shost->host_lock, flags);
1278         put_device(dev->parent);
1279         kfree(rport);
1280         return NULL;
1281 }
1282
1283 /**
1284  * fc_remote_port_add - notifies the fc transport of the existence
1285  *              of a remote FC port.
1286  * @shost:      scsi host the remote port is connected to.
1287  * @channel:    Channel on shost port connected to.
1288  * @ids:        The world wide names, fc address, and FC4 port
1289  *              roles for the remote port.
1290  *
1291  * The LLDD calls this routine to notify the transport of the existence
1292  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1293  * of the port, it's FC address (port_id), and the FC4 roles that are
1294  * active for the port.
1295  *
1296  * For ports that are FCP targets (aka scsi targets), the FC transport
1297  * maintains consistent target id bindings on behalf of the LLDD.
1298  * A consistent target id binding is an assignment of a target id to
1299  * a remote port identifier, which persists while the scsi host is
1300  * attached. The remote port can disappear, then later reappear, and
1301  * it's target id assignment remains the same. This allows for shifts
1302  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1303  * changes to the scsi subsystem which is based on scsi host number and
1304  * target id values.  Bindings are only valid during the attachment of
1305  * the scsi host. If the host detaches, then later re-attaches, target
1306  * id bindings may change.
1307  *
1308  * This routine is responsible for returning a remote port structure.
1309  * The routine will search the list of remote ports it maintains
1310  * internally on behalf of consistent target id mappings. If found, the
1311  * remote port structure will be reused. Otherwise, a new remote port
1312  * structure will be allocated.
1313  *
1314  * Whenever a remote port is allocated, a new fc_remote_port class
1315  * device is created.
1316  *
1317  * Should not be called from interrupt context.
1318  *
1319  * Notes:
1320  *      This routine assumes no locks are held on entry.
1321  **/
1322 struct fc_rport *
1323 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1324         struct fc_rport_identifiers  *ids)
1325 {
1326         struct fc_rport *rport;
1327         unsigned long flags;
1328         int match = 0;
1329
1330         if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) &&
1331                 (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) {
1332
1333                 /* search for a matching consistent binding */
1334
1335                 spin_lock_irqsave(shost->host_lock, flags);
1336
1337                 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1338                                         peers) {
1339                         if (rport->channel != channel)
1340                                 continue;
1341
1342                         switch (fc_host_tgtid_bind_type(shost)) {
1343                         case FC_TGTID_BIND_BY_WWPN:
1344                                 if (rport->port_name == ids->port_name)
1345                                         match = 1;
1346                                 break;
1347                         case FC_TGTID_BIND_BY_WWNN:
1348                                 if (rport->node_name == ids->node_name)
1349                                         match = 1;
1350                                 break;
1351                         case FC_TGTID_BIND_BY_ID:
1352                                 if (rport->port_id == ids->port_id)
1353                                         match = 1;
1354                                 break;
1355                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1356                                 break;
1357                         }
1358
1359                         if (match) {
1360                                 list_move_tail(&rport->peers,
1361                                         &fc_host_rports(shost));
1362                                 break;
1363                         }
1364                 }
1365
1366                 spin_unlock_irqrestore(shost->host_lock, flags);
1367
1368                 if (match) {
1369                         memcpy(&rport->node_name, &ids->node_name,
1370                                 sizeof(rport->node_name));
1371                         memcpy(&rport->port_name, &ids->port_name,
1372                                 sizeof(rport->port_name));
1373                         rport->port_id = ids->port_id;
1374                         rport->roles = ids->roles;
1375                         rport->port_state = FC_PORTSTATE_ONLINE;
1376
1377                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1378                                 /* initiate a scan of the target */
1379                                 scsi_queue_work(shost, &rport->scan_work);
1380
1381                         return rport;
1382                 }
1383         }
1384
1385         /* No consistent binding found - create new remote port entry */
1386         rport = fc_rport_create(shost, channel, ids);
1387
1388         return rport;
1389 }
1390 EXPORT_SYMBOL(fc_remote_port_add);
1391
1392 /*
1393  * fc_rport_tgt_remove - Removes the scsi target on the remote port
1394  * @rport:      The remote port to be operated on
1395  */
1396 static void
1397 fc_rport_tgt_remove(struct fc_rport *rport)
1398 {
1399         struct Scsi_Host *shost = rport_to_shost(rport);
1400
1401         scsi_target_unblock(&rport->dev);
1402
1403         /* Stop anything on the workq */
1404         if (!cancel_delayed_work(&rport->dev_loss_work))
1405                 flush_scheduled_work();
1406         scsi_flush_work(shost);
1407
1408         scsi_remove_target(&rport->dev);
1409 }
1410
1411 /*
1412  * fc_rport_terminate - this routine tears down and deallocates a remote port.
1413  * @rport:      The remote port to be terminated
1414  *
1415  * Notes:
1416  *      This routine assumes no locks are held on entry.
1417  */
1418 static void
1419 fc_rport_terminate(struct fc_rport  *rport)
1420 {
1421         struct Scsi_Host *shost = rport_to_shost(rport);
1422         struct device *dev = &rport->dev;
1423         unsigned long flags;
1424
1425         fc_rport_tgt_remove(rport);
1426
1427         transport_remove_device(dev);
1428         device_del(dev);
1429         transport_destroy_device(dev);
1430         spin_lock_irqsave(shost->host_lock, flags);
1431         list_del(&rport->peers);
1432         spin_unlock_irqrestore(shost->host_lock, flags);
1433         put_device(&shost->shost_gendev);
1434 }
1435
1436 /**
1437  * fc_remote_port_delete - notifies the fc transport that a remote
1438  *              port is no longer in existence.
1439  * @rport:      The remote port that no longer exists
1440  *
1441  * The LLDD calls this routine to notify the transport that a remote
1442  * port is no longer part of the topology. Note: Although a port
1443  * may no longer be part of the topology, it may persist in the remote
1444  * ports displayed by the fc_host. This is done so that target id
1445  * mappings (managed via the remote port structures), are always visible
1446  * as long as the mapping is valid, regardless of port state,
1447  *
1448  * If the remote port is not an FCP Target, it will be fully torn down
1449  * and deallocated, including the fc_remote_port class device.
1450  *
1451  * If the remote port is an FCP Target, the port structure will be
1452  * marked as Not Present, but will remain as long as there is a valid
1453  * SCSI target id mapping associated with the port structure. Validity
1454  * is determined by the binding type. If binding by wwpn, then the port
1455  * structure is always valid and will not be deallocated until the host
1456  * is removed.  If binding by wwnn, then the port structure is valid
1457  * until another port with the same node name is found in the topology.
1458  * If binding by port id (fc address), then the port structure is valid
1459  * valid until another port with the same address is identified.
1460  *
1461  * Called from interrupt or normal process context.
1462  *
1463  * Notes:
1464  *      This routine assumes no locks are held on entry.
1465  **/
1466 void
1467 fc_remote_port_delete(struct fc_rport  *rport)
1468 {
1469         struct Scsi_Host *shost = rport_to_shost(rport);
1470         unsigned long flags;
1471
1472         /* If no scsi target id mapping or consistent binding type, delete it */
1473         if ((rport->scsi_target_id == -1) ||
1474             (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) {
1475                 fc_rport_terminate(rport);
1476                 return;
1477         }
1478
1479         fc_rport_tgt_remove(rport);
1480
1481         spin_lock_irqsave(shost->host_lock, flags);
1482         list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1483         spin_unlock_irqrestore(shost->host_lock, flags);
1484
1485         /*
1486          * Note: We do not remove or clear the hostdata area. This allows
1487          *   host-specific target data to persist along with the
1488          *   scsi_target_id. It's up to the host to manage it's hostdata area.
1489          */
1490
1491         /*
1492          * Reinitialize port attributes that may change if the port comes back.
1493          */
1494         rport->maxframe_size = -1;
1495         rport->supported_classes = FC_COS_UNSPECIFIED;
1496         rport->roles = FC_RPORT_ROLE_UNKNOWN;
1497         rport->port_state = FC_PORTSTATE_NOTPRESENT;
1498
1499         /* remove the identifiers that aren't used in the consisting binding */
1500         switch (fc_host_tgtid_bind_type(shost)) {
1501         case FC_TGTID_BIND_BY_WWPN:
1502                 rport->node_name = -1;
1503                 rport->port_id = -1;
1504                 break;
1505         case FC_TGTID_BIND_BY_WWNN:
1506                 rport->port_name = -1;
1507                 rport->port_id = -1;
1508                 break;
1509         case FC_TGTID_BIND_BY_ID:
1510                 rport->node_name = -1;
1511                 rport->port_name = -1;
1512                 break;
1513         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
1514                 break;
1515         }
1516 }
1517 EXPORT_SYMBOL(fc_remote_port_delete);
1518
1519 /**
1520  * fc_remote_port_rolechg - notifies the fc transport that the roles
1521  *              on a remote may have changed.
1522  * @rport:      The remote port that changed.
1523  *
1524  * The LLDD calls this routine to notify the transport that the roles
1525  * on a remote port may have changed. The largest effect of this is
1526  * if a port now becomes a FCP Target, it must be allocated a
1527  * scsi target id.  If the port is no longer a FCP target, any
1528  * scsi target id value assigned to it will persist in case the
1529  * role changes back to include FCP Target. No changes in the scsi
1530  * midlayer will be invoked if the role changes (in the expectation
1531  * that the role will be resumed. If it doesn't normal error processing
1532  * will take place).
1533  *
1534  * Should not be called from interrupt context.
1535  *
1536  * Notes:
1537  *      This routine assumes no locks are held on entry.
1538  **/
1539 void
1540 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1541 {
1542         struct Scsi_Host *shost = rport_to_shost(rport);
1543         struct fc_host_attrs *fc_host =
1544                         (struct fc_host_attrs *)shost->shost_data;
1545         unsigned long flags;
1546         int create = 0;
1547
1548         rport->roles = roles;
1549
1550         spin_lock_irqsave(shost->host_lock, flags);
1551         if ((rport->scsi_target_id == -1) &&
1552             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
1553                 rport->scsi_target_id = fc_host->next_target_id++;
1554                 create = 1;
1555         }
1556         spin_unlock_irqrestore(shost->host_lock, flags);
1557
1558         if (create)
1559                 /* initiate a scan of the target */
1560                 scsi_queue_work(shost, &rport->scan_work);
1561 }
1562 EXPORT_SYMBOL(fc_remote_port_rolechg);
1563
1564 /**
1565  * fc_timeout_blocked_rport - Timeout handler for blocked remote port
1566  *                       that fails to return in the alloted time.
1567  * @data:       scsi target that failed to reappear in the alloted time.
1568  **/
1569 static void
1570 fc_timeout_blocked_rport(void  *data)
1571 {
1572         struct fc_rport *rport = (struct fc_rport *)data;
1573
1574         rport->port_state = FC_PORTSTATE_OFFLINE;
1575
1576         dev_printk(KERN_ERR, &rport->dev,
1577                 "blocked FC remote port time out: removing target\n");
1578
1579         /*
1580          * As this only occurs if the remote port (scsi target)
1581          * went away and didn't come back - we'll remove
1582          * all attached scsi devices.
1583          */
1584         scsi_target_unblock(&rport->dev);
1585         scsi_remove_target(&rport->dev);
1586 }
1587
1588 /**
1589  * fc_remote_port_block - temporarily block any scsi traffic to a remote port.
1590  * @rport:      remote port to be blocked.
1591  *
1592  * scsi lldd's with a FC transport call this routine to temporarily stop
1593  * all scsi traffic to a remote port. If the port is not a SCSI target,
1594  * no action is taken. If the port is a SCSI target, all attached devices
1595  * are placed into a SDEV_BLOCK state and a timer is started. The timer is
1596  * represents the maximum amount of time the port may be blocked. If the
1597  * timer expires, the port is considered non-existent and the attached
1598  * scsi devices will be removed.
1599  *
1600  * Called from interrupt or normal process context.
1601  *
1602  * Returns zero if successful or error if not
1603  *
1604  * Notes:
1605  *      This routine assumes no locks are held on entry.
1606  *
1607  *      The timeout and timer types are extracted from the fc transport
1608  *      attributes from the caller's rport pointer.
1609  **/
1610 int
1611 fc_remote_port_block(struct fc_rport *rport)
1612 {
1613         int timeout = rport->dev_loss_tmo;
1614         struct work_struct *work = &rport->dev_loss_work;
1615
1616         if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1617                 return -EINVAL;
1618
1619         scsi_target_block(&rport->dev);
1620
1621         /* cap the length the devices can be blocked */
1622         schedule_delayed_work(work, timeout * HZ);
1623
1624         rport->port_state = FC_PORTSTATE_BLOCKED;
1625         return 0;
1626 }
1627 EXPORT_SYMBOL(fc_remote_port_block);
1628
1629 /**
1630  * fc_remote_port_unblock - restart any blocked scsi traffic to a remote port.
1631  * @rport:      remote port to be unblocked.
1632  *
1633  * scsi lld's with a FC transport call this routine to restart IO to all
1634  * devices associated with the caller's scsi target following a fc_target_block
1635  * request.  Called from interrupt or normal process context.
1636  *
1637  * Notes:
1638  *      This routine assumes no locks are held on entry.
1639  **/
1640  void
1641 fc_remote_port_unblock(struct fc_rport *rport)
1642 {
1643         struct work_struct *work = &rport->dev_loss_work;
1644         struct Scsi_Host *shost = rport_to_shost(rport);
1645
1646         /*
1647          * Stop the target timer first. Take no action on the del_timer
1648          * failure as the state machine state change will validate the
1649          * transaction.
1650          */
1651         if (!cancel_delayed_work(work))
1652                 flush_scheduled_work();
1653
1654         if (rport->port_state == FC_PORTSTATE_OFFLINE)
1655                 /*
1656                  * initiate a scan of the target as the target has
1657                  * been torn down.
1658                  */
1659                 scsi_queue_work(shost, &rport->scan_work);
1660         else
1661                 scsi_target_unblock(&rport->dev);
1662
1663         rport->port_state = FC_PORTSTATE_ONLINE;
1664 }
1665 EXPORT_SYMBOL(fc_remote_port_unblock);
1666
1667 /**
1668  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1669  * @data:       remote port to be scanned.
1670  **/
1671 static void
1672 fc_scsi_scan_rport(void *data)
1673 {
1674         struct fc_rport *rport = (struct fc_rport *)data;
1675
1676         scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1677                         SCAN_WILD_CARD, 1);
1678 }
1679
1680
1681 MODULE_AUTHOR("Martin Hicks");
1682 MODULE_DESCRIPTION("FC Transport Attributes");
1683 MODULE_LICENSE("GPL");
1684
1685 module_init(fc_transport_init);
1686 module_exit(fc_transport_exit);